Restoring authorship annotation for <anastasy888@yandex-team.ru>. Commit 2 of 2.

37 files changed, 6979 insertions, 6979 deletions

diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/failure_signal_handler.cc b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/failure_signal_handler.cc
index 9e89688949..fa6e30f935 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/failure_signal_handler.cc
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/failure_signal_handler.cc
@@ -1,226 +1,226 @@
-// 
-// Copyright 2018 The Abseil Authors. 
-// 
-// Licensed under the Apache License, Version 2.0 (the "License"); 
-// you may not use this file except in compliance with the License. 
-// You may obtain a copy of the License at 
-// 
-//      https://www.apache.org/licenses/LICENSE-2.0 
-// 
-// Unless required by applicable law or agreed to in writing, software 
-// distributed under the License is distributed on an "AS IS" BASIS, 
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
-// See the License for the specific language governing permissions and 
-// limitations under the License. 
-// 
- 
+//
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
 #include "y_absl/debugging/failure_signal_handler.h"
- 
+
 #include "y_absl/base/config.h"
- 
-#ifdef _WIN32 
-#include <windows.h> 
-#else 
+
+#ifdef _WIN32
+#include <windows.h>
+#else
 #include <sched.h>
-#include <unistd.h> 
-#endif 
- 
+#include <unistd.h>
+#endif
+
 #ifdef __APPLE__
 #include <TargetConditionals.h>
 #endif
 
-#ifdef ABSL_HAVE_MMAP 
-#include <sys/mman.h> 
-#endif 
- 
-#include <algorithm> 
-#include <atomic> 
-#include <cerrno> 
-#include <csignal> 
-#include <cstdio> 
-#include <cstring> 
-#include <ctime> 
- 
+#ifdef ABSL_HAVE_MMAP
+#include <sys/mman.h>
+#endif
+
+#include <algorithm>
+#include <atomic>
+#include <cerrno>
+#include <csignal>
+#include <cstdio>
+#include <cstring>
+#include <ctime>
+
 #include "y_absl/base/attributes.h"
 #include "y_absl/base/internal/errno_saver.h"
 #include "y_absl/base/internal/raw_logging.h"
 #include "y_absl/base/internal/sysinfo.h"
 #include "y_absl/debugging/internal/examine_stack.h"
 #include "y_absl/debugging/stacktrace.h"
- 
-#ifndef _WIN32 
-#define ABSL_HAVE_SIGACTION 
+
+#ifndef _WIN32
+#define ABSL_HAVE_SIGACTION
 // Apple WatchOS and TVOS don't allow sigaltstack
 #if !(defined(TARGET_OS_WATCH) && TARGET_OS_WATCH) && \
     !(defined(TARGET_OS_TV) && TARGET_OS_TV)
 #define ABSL_HAVE_SIGALTSTACK
-#endif 
 #endif
- 
+#endif
+
 namespace y_absl {
 ABSL_NAMESPACE_BEGIN
- 
-ABSL_CONST_INIT static FailureSignalHandlerOptions fsh_options; 
- 
-// Resets the signal handler for signo to the default action for that 
-// signal, then raises the signal. 
-static void RaiseToDefaultHandler(int signo) { 
-  signal(signo, SIG_DFL); 
-  raise(signo); 
-} 
- 
-struct FailureSignalData { 
-  const int signo; 
-  const char* const as_string; 
-#ifdef ABSL_HAVE_SIGACTION 
-  struct sigaction previous_action; 
-  // StructSigaction is used to silence -Wmissing-field-initializers. 
-  using StructSigaction = struct sigaction; 
-  #define FSD_PREVIOUS_INIT FailureSignalData::StructSigaction() 
-#else 
-  void (*previous_handler)(int); 
-  #define FSD_PREVIOUS_INIT SIG_DFL 
-#endif 
-}; 
- 
-ABSL_CONST_INIT static FailureSignalData failure_signal_data[] = { 
-    {SIGSEGV, "SIGSEGV", FSD_PREVIOUS_INIT}, 
-    {SIGILL, "SIGILL", FSD_PREVIOUS_INIT}, 
-    {SIGFPE, "SIGFPE", FSD_PREVIOUS_INIT}, 
-    {SIGABRT, "SIGABRT", FSD_PREVIOUS_INIT}, 
-    {SIGTERM, "SIGTERM", FSD_PREVIOUS_INIT}, 
-#ifndef _WIN32 
-    {SIGBUS, "SIGBUS", FSD_PREVIOUS_INIT}, 
-    {SIGTRAP, "SIGTRAP", FSD_PREVIOUS_INIT}, 
-#endif 
-}; 
- 
-#undef FSD_PREVIOUS_INIT 
- 
-static void RaiseToPreviousHandler(int signo) { 
-  // Search for the previous handler. 
-  for (const auto& it : failure_signal_data) { 
-    if (it.signo == signo) { 
-#ifdef ABSL_HAVE_SIGACTION 
-      sigaction(signo, &it.previous_action, nullptr); 
-#else 
-      signal(signo, it.previous_handler); 
-#endif 
-      raise(signo); 
-      return; 
-    } 
-  } 
- 
-  // Not found, use the default handler. 
-  RaiseToDefaultHandler(signo); 
-} 
- 
-namespace debugging_internal { 
- 
-const char* FailureSignalToString(int signo) { 
-  for (const auto& it : failure_signal_data) { 
-    if (it.signo == signo) { 
-      return it.as_string; 
-    } 
-  } 
-  return ""; 
-} 
- 
-}  // namespace debugging_internal 
- 
+
+ABSL_CONST_INIT static FailureSignalHandlerOptions fsh_options;
+
+// Resets the signal handler for signo to the default action for that
+// signal, then raises the signal.
+static void RaiseToDefaultHandler(int signo) {
+  signal(signo, SIG_DFL);
+  raise(signo);
+}
+
+struct FailureSignalData {
+  const int signo;
+  const char* const as_string;
+#ifdef ABSL_HAVE_SIGACTION
+  struct sigaction previous_action;
+  // StructSigaction is used to silence -Wmissing-field-initializers.
+  using StructSigaction = struct sigaction;
+  #define FSD_PREVIOUS_INIT FailureSignalData::StructSigaction()
+#else
+  void (*previous_handler)(int);
+  #define FSD_PREVIOUS_INIT SIG_DFL
+#endif
+};
+
+ABSL_CONST_INIT static FailureSignalData failure_signal_data[] = {
+    {SIGSEGV, "SIGSEGV", FSD_PREVIOUS_INIT},
+    {SIGILL, "SIGILL", FSD_PREVIOUS_INIT},
+    {SIGFPE, "SIGFPE", FSD_PREVIOUS_INIT},
+    {SIGABRT, "SIGABRT", FSD_PREVIOUS_INIT},
+    {SIGTERM, "SIGTERM", FSD_PREVIOUS_INIT},
+#ifndef _WIN32
+    {SIGBUS, "SIGBUS", FSD_PREVIOUS_INIT},
+    {SIGTRAP, "SIGTRAP", FSD_PREVIOUS_INIT},
+#endif
+};
+
+#undef FSD_PREVIOUS_INIT
+
+static void RaiseToPreviousHandler(int signo) {
+  // Search for the previous handler.
+  for (const auto& it : failure_signal_data) {
+    if (it.signo == signo) {
+#ifdef ABSL_HAVE_SIGACTION
+      sigaction(signo, &it.previous_action, nullptr);
+#else
+      signal(signo, it.previous_handler);
+#endif
+      raise(signo);
+      return;
+    }
+  }
+
+  // Not found, use the default handler.
+  RaiseToDefaultHandler(signo);
+}
+
+namespace debugging_internal {
+
+const char* FailureSignalToString(int signo) {
+  for (const auto& it : failure_signal_data) {
+    if (it.signo == signo) {
+      return it.as_string;
+    }
+  }
+  return "";
+}
+
+}  // namespace debugging_internal
+
 #ifdef ABSL_HAVE_SIGALTSTACK
- 
-static bool SetupAlternateStackOnce() { 
-#if defined(__wasm__) || defined (__asjms__) 
-  const size_t page_mask = getpagesize() - 1; 
-#else 
-  const size_t page_mask = sysconf(_SC_PAGESIZE) - 1; 
-#endif 
+
+static bool SetupAlternateStackOnce() {
+#if defined(__wasm__) || defined (__asjms__)
+  const size_t page_mask = getpagesize() - 1;
+#else
+  const size_t page_mask = sysconf(_SC_PAGESIZE) - 1;
+#endif
   size_t stack_size =
       (std::max<size_t>(SIGSTKSZ, 65536) + page_mask) & ~page_mask;
 #if defined(ABSL_HAVE_ADDRESS_SANITIZER) || \
     defined(ABSL_HAVE_MEMORY_SANITIZER) || defined(ABSL_HAVE_THREAD_SANITIZER)
-  // Account for sanitizer instrumentation requiring additional stack space. 
-  stack_size *= 5; 
-#endif 
- 
-  stack_t sigstk; 
-  memset(&sigstk, 0, sizeof(sigstk)); 
-  sigstk.ss_size = stack_size; 
- 
-#ifdef ABSL_HAVE_MMAP 
-#ifndef MAP_STACK 
-#define MAP_STACK 0 
-#endif 
-#if defined(MAP_ANON) && !defined(MAP_ANONYMOUS) 
-#define MAP_ANONYMOUS MAP_ANON 
-#endif 
-  sigstk.ss_sp = mmap(nullptr, sigstk.ss_size, PROT_READ | PROT_WRITE, 
-                      MAP_PRIVATE | MAP_ANONYMOUS | MAP_STACK, -1, 0); 
-  if (sigstk.ss_sp == MAP_FAILED) { 
-    ABSL_RAW_LOG(FATAL, "mmap() for alternate signal stack failed"); 
-  } 
-#else 
-  sigstk.ss_sp = malloc(sigstk.ss_size); 
-  if (sigstk.ss_sp == nullptr) { 
-    ABSL_RAW_LOG(FATAL, "malloc() for alternate signal stack failed"); 
-  } 
-#endif 
- 
-  if (sigaltstack(&sigstk, nullptr) != 0) { 
-    ABSL_RAW_LOG(FATAL, "sigaltstack() failed with errno=%d", errno); 
-  } 
-  return true; 
-} 
- 
-#endif 
- 
-#ifdef ABSL_HAVE_SIGACTION 
- 
-// Sets up an alternate stack for signal handlers once. 
-// Returns the appropriate flag for sig_action.sa_flags 
-// if the system supports using an alternate stack. 
-static int MaybeSetupAlternateStack() { 
+  // Account for sanitizer instrumentation requiring additional stack space.
+  stack_size *= 5;
+#endif
+
+  stack_t sigstk;
+  memset(&sigstk, 0, sizeof(sigstk));
+  sigstk.ss_size = stack_size;
+
+#ifdef ABSL_HAVE_MMAP
+#ifndef MAP_STACK
+#define MAP_STACK 0
+#endif
+#if defined(MAP_ANON) && !defined(MAP_ANONYMOUS)
+#define MAP_ANONYMOUS MAP_ANON
+#endif
+  sigstk.ss_sp = mmap(nullptr, sigstk.ss_size, PROT_READ | PROT_WRITE,
+                      MAP_PRIVATE | MAP_ANONYMOUS | MAP_STACK, -1, 0);
+  if (sigstk.ss_sp == MAP_FAILED) {
+    ABSL_RAW_LOG(FATAL, "mmap() for alternate signal stack failed");
+  }
+#else
+  sigstk.ss_sp = malloc(sigstk.ss_size);
+  if (sigstk.ss_sp == nullptr) {
+    ABSL_RAW_LOG(FATAL, "malloc() for alternate signal stack failed");
+  }
+#endif
+
+  if (sigaltstack(&sigstk, nullptr) != 0) {
+    ABSL_RAW_LOG(FATAL, "sigaltstack() failed with errno=%d", errno);
+  }
+  return true;
+}
+
+#endif
+
+#ifdef ABSL_HAVE_SIGACTION
+
+// Sets up an alternate stack for signal handlers once.
+// Returns the appropriate flag for sig_action.sa_flags
+// if the system supports using an alternate stack.
+static int MaybeSetupAlternateStack() {
 #ifdef ABSL_HAVE_SIGALTSTACK
-  ABSL_ATTRIBUTE_UNUSED static const bool kOnce = SetupAlternateStackOnce(); 
-  return SA_ONSTACK; 
-#else 
-  return 0; 
-#endif 
-} 
- 
-static void InstallOneFailureHandler(FailureSignalData* data, 
-                                     void (*handler)(int, siginfo_t*, void*)) { 
-  struct sigaction act; 
-  memset(&act, 0, sizeof(act)); 
-  sigemptyset(&act.sa_mask); 
-  act.sa_flags |= SA_SIGINFO; 
-  // SA_NODEFER is required to handle SIGABRT from 
-  // ImmediateAbortSignalHandler(). 
-  act.sa_flags |= SA_NODEFER; 
-  if (fsh_options.use_alternate_stack) { 
-    act.sa_flags |= MaybeSetupAlternateStack(); 
-  } 
-  act.sa_sigaction = handler; 
-  ABSL_RAW_CHECK(sigaction(data->signo, &act, &data->previous_action) == 0, 
-                 "sigaction() failed"); 
-} 
- 
-#else 
- 
-static void InstallOneFailureHandler(FailureSignalData* data, 
-                                     void (*handler)(int)) { 
-  data->previous_handler = signal(data->signo, handler); 
-  ABSL_RAW_CHECK(data->previous_handler != SIG_ERR, "signal() failed"); 
-} 
- 
-#endif 
- 
-static void WriteToStderr(const char* data) { 
+  ABSL_ATTRIBUTE_UNUSED static const bool kOnce = SetupAlternateStackOnce();
+  return SA_ONSTACK;
+#else
+  return 0;
+#endif
+}
+
+static void InstallOneFailureHandler(FailureSignalData* data,
+                                     void (*handler)(int, siginfo_t*, void*)) {
+  struct sigaction act;
+  memset(&act, 0, sizeof(act));
+  sigemptyset(&act.sa_mask);
+  act.sa_flags |= SA_SIGINFO;
+  // SA_NODEFER is required to handle SIGABRT from
+  // ImmediateAbortSignalHandler().
+  act.sa_flags |= SA_NODEFER;
+  if (fsh_options.use_alternate_stack) {
+    act.sa_flags |= MaybeSetupAlternateStack();
+  }
+  act.sa_sigaction = handler;
+  ABSL_RAW_CHECK(sigaction(data->signo, &act, &data->previous_action) == 0,
+                 "sigaction() failed");
+}
+
+#else
+
+static void InstallOneFailureHandler(FailureSignalData* data,
+                                     void (*handler)(int)) {
+  data->previous_handler = signal(data->signo, handler);
+  ABSL_RAW_CHECK(data->previous_handler != SIG_ERR, "signal() failed");
+}
+
+#endif
+
+static void WriteToStderr(const char* data) {
   y_absl::base_internal::ErrnoSaver errno_saver;
   y_absl::raw_logging_internal::SafeWriteToStderr(data, strlen(data));
-} 
- 
+}
+
 static void WriteSignalMessage(int signo, int cpu,
                                void (*writerfn)(const char*)) {
   char buf[96];
@@ -228,121 +228,121 @@ static void WriteSignalMessage(int signo, int cpu,
   if (cpu != -1) {
     snprintf(on_cpu, sizeof(on_cpu), " on cpu %d", cpu);
   }
-  const char* const signal_string = 
-      debugging_internal::FailureSignalToString(signo); 
-  if (signal_string != nullptr && signal_string[0] != '\0') { 
+  const char* const signal_string =
+      debugging_internal::FailureSignalToString(signo);
+  if (signal_string != nullptr && signal_string[0] != '\0') {
     snprintf(buf, sizeof(buf), "*** %s received at time=%ld%s ***\n",
-             signal_string, 
+             signal_string,
              static_cast<long>(time(nullptr)),   // NOLINT(runtime/int)
              on_cpu);
-  } else { 
+  } else {
     snprintf(buf, sizeof(buf), "*** Signal %d received at time=%ld%s ***\n",
              signo, static_cast<long>(time(nullptr)),  // NOLINT(runtime/int)
              on_cpu);
-  } 
-  writerfn(buf); 
-} 
- 
-// `void*` might not be big enough to store `void(*)(const char*)`. 
-struct WriterFnStruct { 
-  void (*writerfn)(const char*); 
-}; 
- 
+  }
+  writerfn(buf);
+}
+
+// `void*` might not be big enough to store `void(*)(const char*)`.
+struct WriterFnStruct {
+  void (*writerfn)(const char*);
+};
+
 // Many of the y_absl::debugging_internal::Dump* functions in
-// examine_stack.h take a writer function pointer that has a void* arg 
-// for historical reasons. failure_signal_handler_writer only takes a 
-// data pointer. This function converts between these types. 
-static void WriterFnWrapper(const char* data, void* arg) { 
-  static_cast<WriterFnStruct*>(arg)->writerfn(data); 
-} 
- 
-// Convenient wrapper around DumpPCAndFrameSizesAndStackTrace() for signal 
-// handlers. "noinline" so that GetStackFrames() skips the top-most stack 
-// frame for this function. 
-ABSL_ATTRIBUTE_NOINLINE static void WriteStackTrace( 
-    void* ucontext, bool symbolize_stacktrace, 
-    void (*writerfn)(const char*, void*), void* writerfn_arg) { 
-  constexpr int kNumStackFrames = 32; 
-  void* stack[kNumStackFrames]; 
-  int frame_sizes[kNumStackFrames]; 
-  int min_dropped_frames; 
+// examine_stack.h take a writer function pointer that has a void* arg
+// for historical reasons. failure_signal_handler_writer only takes a
+// data pointer. This function converts between these types.
+static void WriterFnWrapper(const char* data, void* arg) {
+  static_cast<WriterFnStruct*>(arg)->writerfn(data);
+}
+
+// Convenient wrapper around DumpPCAndFrameSizesAndStackTrace() for signal
+// handlers. "noinline" so that GetStackFrames() skips the top-most stack
+// frame for this function.
+ABSL_ATTRIBUTE_NOINLINE static void WriteStackTrace(
+    void* ucontext, bool symbolize_stacktrace,
+    void (*writerfn)(const char*, void*), void* writerfn_arg) {
+  constexpr int kNumStackFrames = 32;
+  void* stack[kNumStackFrames];
+  int frame_sizes[kNumStackFrames];
+  int min_dropped_frames;
   int depth = y_absl::GetStackFramesWithContext(
-      stack, frame_sizes, kNumStackFrames, 
-      1,  // Do not include this function in stack trace. 
-      ucontext, &min_dropped_frames); 
+      stack, frame_sizes, kNumStackFrames,
+      1,  // Do not include this function in stack trace.
+      ucontext, &min_dropped_frames);
   y_absl::debugging_internal::DumpPCAndFrameSizesAndStackTrace(
       y_absl::debugging_internal::GetProgramCounter(ucontext), stack, frame_sizes,
-      depth, min_dropped_frames, symbolize_stacktrace, writerfn, writerfn_arg); 
-} 
- 
-// Called by AbslFailureSignalHandler() to write the failure info. It is 
-// called once with writerfn set to WriteToStderr() and then possibly 
-// with writerfn set to the user provided function. 
+      depth, min_dropped_frames, symbolize_stacktrace, writerfn, writerfn_arg);
+}
+
+// Called by AbslFailureSignalHandler() to write the failure info. It is
+// called once with writerfn set to WriteToStderr() and then possibly
+// with writerfn set to the user provided function.
 static void WriteFailureInfo(int signo, void* ucontext, int cpu,
-                             void (*writerfn)(const char*)) { 
-  WriterFnStruct writerfn_struct{writerfn}; 
+                             void (*writerfn)(const char*)) {
+  WriterFnStruct writerfn_struct{writerfn};
   WriteSignalMessage(signo, cpu, writerfn);
-  WriteStackTrace(ucontext, fsh_options.symbolize_stacktrace, WriterFnWrapper, 
-                  &writerfn_struct); 
-} 
- 
+  WriteStackTrace(ucontext, fsh_options.symbolize_stacktrace, WriterFnWrapper,
+                  &writerfn_struct);
+}
+
 // y_absl::SleepFor() can't be used here since AbslInternalSleepFor()
-// may be overridden to do something that isn't async-signal-safe on 
-// some platforms. 
-static void PortableSleepForSeconds(int seconds) { 
-#ifdef _WIN32 
-  Sleep(seconds * 1000); 
-#else 
-  struct timespec sleep_time; 
-  sleep_time.tv_sec = seconds; 
-  sleep_time.tv_nsec = 0; 
-  while (nanosleep(&sleep_time, &sleep_time) != 0 && errno == EINTR) {} 
-#endif 
-} 
- 
-#ifdef ABSL_HAVE_ALARM 
-// AbslFailureSignalHandler() installs this as a signal handler for 
-// SIGALRM, then sets an alarm to be delivered to the program after a 
-// set amount of time. If AbslFailureSignalHandler() hangs for more than 
-// the alarm timeout, ImmediateAbortSignalHandler() will abort the 
-// program. 
-static void ImmediateAbortSignalHandler(int) { 
-  RaiseToDefaultHandler(SIGABRT); 
-} 
-#endif 
- 
+// may be overridden to do something that isn't async-signal-safe on
+// some platforms.
+static void PortableSleepForSeconds(int seconds) {
+#ifdef _WIN32
+  Sleep(seconds * 1000);
+#else
+  struct timespec sleep_time;
+  sleep_time.tv_sec = seconds;
+  sleep_time.tv_nsec = 0;
+  while (nanosleep(&sleep_time, &sleep_time) != 0 && errno == EINTR) {}
+#endif
+}
+
+#ifdef ABSL_HAVE_ALARM
+// AbslFailureSignalHandler() installs this as a signal handler for
+// SIGALRM, then sets an alarm to be delivered to the program after a
+// set amount of time. If AbslFailureSignalHandler() hangs for more than
+// the alarm timeout, ImmediateAbortSignalHandler() will abort the
+// program.
+static void ImmediateAbortSignalHandler(int) {
+  RaiseToDefaultHandler(SIGABRT);
+}
+#endif
+
 // y_absl::base_internal::GetTID() returns pid_t on most platforms, but
 // returns y_absl::base_internal::pid_t on Windows.
 using GetTidType = decltype(y_absl::base_internal::GetTID());
-ABSL_CONST_INIT static std::atomic<GetTidType> failed_tid(0); 
- 
-#ifndef ABSL_HAVE_SIGACTION 
-static void AbslFailureSignalHandler(int signo) { 
-  void* ucontext = nullptr; 
-#else 
-static void AbslFailureSignalHandler(int signo, siginfo_t*, void* ucontext) { 
-#endif 
- 
+ABSL_CONST_INIT static std::atomic<GetTidType> failed_tid(0);
+
+#ifndef ABSL_HAVE_SIGACTION
+static void AbslFailureSignalHandler(int signo) {
+  void* ucontext = nullptr;
+#else
+static void AbslFailureSignalHandler(int signo, siginfo_t*, void* ucontext) {
+#endif
+
   const GetTidType this_tid = y_absl::base_internal::GetTID();
-  GetTidType previous_failed_tid = 0; 
-  if (!failed_tid.compare_exchange_strong( 
-          previous_failed_tid, static_cast<intptr_t>(this_tid), 
-          std::memory_order_acq_rel, std::memory_order_relaxed)) { 
-    ABSL_RAW_LOG( 
-        ERROR, 
-        "Signal %d raised at PC=%p while already in AbslFailureSignalHandler()", 
+  GetTidType previous_failed_tid = 0;
+  if (!failed_tid.compare_exchange_strong(
+          previous_failed_tid, static_cast<intptr_t>(this_tid),
+          std::memory_order_acq_rel, std::memory_order_relaxed)) {
+    ABSL_RAW_LOG(
+        ERROR,
+        "Signal %d raised at PC=%p while already in AbslFailureSignalHandler()",
         signo, y_absl::debugging_internal::GetProgramCounter(ucontext));
-    if (this_tid != previous_failed_tid) { 
-      // Another thread is already in AbslFailureSignalHandler(), so wait 
-      // a bit for it to finish. If the other thread doesn't kill us, 
-      // we do so after sleeping. 
-      PortableSleepForSeconds(3); 
-      RaiseToDefaultHandler(signo); 
-      // The recursively raised signal may be blocked until we return. 
-      return; 
-    } 
-  } 
- 
+    if (this_tid != previous_failed_tid) {
+      // Another thread is already in AbslFailureSignalHandler(), so wait
+      // a bit for it to finish. If the other thread doesn't kill us,
+      // we do so after sleeping.
+      PortableSleepForSeconds(3);
+      RaiseToDefaultHandler(signo);
+      // The recursively raised signal may be blocked until we return.
+      return;
+    }
+  }
+
   // Increase the chance that the CPU we report was the same CPU on which the
   // signal was received by doing this as early as possible, i.e. after
   // verifying that this is not a recursive signal handler invocation.
@@ -351,38 +351,38 @@ static void AbslFailureSignalHandler(int signo, siginfo_t*, void* ucontext) {
   my_cpu = sched_getcpu();
 #endif
 
-#ifdef ABSL_HAVE_ALARM 
-  // Set an alarm to abort the program in case this code hangs or deadlocks. 
-  if (fsh_options.alarm_on_failure_secs > 0) { 
-    alarm(0);  // Cancel any existing alarms. 
-    signal(SIGALRM, ImmediateAbortSignalHandler); 
-    alarm(fsh_options.alarm_on_failure_secs); 
-  } 
-#endif 
- 
-  // First write to stderr. 
+#ifdef ABSL_HAVE_ALARM
+  // Set an alarm to abort the program in case this code hangs or deadlocks.
+  if (fsh_options.alarm_on_failure_secs > 0) {
+    alarm(0);  // Cancel any existing alarms.
+    signal(SIGALRM, ImmediateAbortSignalHandler);
+    alarm(fsh_options.alarm_on_failure_secs);
+  }
+#endif
+
+  // First write to stderr.
   WriteFailureInfo(signo, ucontext, my_cpu, WriteToStderr);
- 
-  // Riskier code (because it is less likely to be async-signal-safe) 
-  // goes after this point. 
-  if (fsh_options.writerfn != nullptr) { 
+
+  // Riskier code (because it is less likely to be async-signal-safe)
+  // goes after this point.
+  if (fsh_options.writerfn != nullptr) {
     WriteFailureInfo(signo, ucontext, my_cpu, fsh_options.writerfn);
     fsh_options.writerfn(nullptr);
-  } 
- 
-  if (fsh_options.call_previous_handler) { 
-    RaiseToPreviousHandler(signo); 
-  } else { 
-    RaiseToDefaultHandler(signo); 
-  } 
-} 
- 
-void InstallFailureSignalHandler(const FailureSignalHandlerOptions& options) { 
-  fsh_options = options; 
-  for (auto& it : failure_signal_data) { 
-    InstallOneFailureHandler(&it, AbslFailureSignalHandler); 
-  } 
-} 
- 
+  }
+
+  if (fsh_options.call_previous_handler) {
+    RaiseToPreviousHandler(signo);
+  } else {
+    RaiseToDefaultHandler(signo);
+  }
+}
+
+void InstallFailureSignalHandler(const FailureSignalHandlerOptions& options) {
+  fsh_options = options;
+  for (auto& it : failure_signal_data) {
+    InstallOneFailureHandler(&it, AbslFailureSignalHandler);
+  }
+}
+
 ABSL_NAMESPACE_END
 }  // namespace y_absl
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/failure_signal_handler.h b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/failure_signal_handler.h
index 11fe985854..879df3c434 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/failure_signal_handler.h
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/failure_signal_handler.h
@@ -1,121 +1,121 @@
-// Copyright 2018 The Abseil Authors. 
-// 
-// Licensed under the Apache License, Version 2.0 (the "License"); 
-// you may not use this file except in compliance with the License. 
-// You may obtain a copy of the License at 
-// 
-//      https://www.apache.org/licenses/LICENSE-2.0 
-// 
-// Unless required by applicable law or agreed to in writing, software 
-// distributed under the License is distributed on an "AS IS" BASIS, 
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
-// See the License for the specific language governing permissions and 
-// limitations under the License. 
-// 
-// ----------------------------------------------------------------------------- 
-// File: failure_signal_handler.h 
-// ----------------------------------------------------------------------------- 
-// 
-// This file configures the Abseil *failure signal handler* to capture and dump 
-// useful debugging information (such as a stacktrace) upon program failure. 
-// 
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: failure_signal_handler.h
+// -----------------------------------------------------------------------------
+//
+// This file configures the Abseil *failure signal handler* to capture and dump
+// useful debugging information (such as a stacktrace) upon program failure.
+//
 // To use the failure signal handler, call `y_absl::InstallFailureSignalHandler()`
-// very early in your program, usually in the first few lines of main(): 
-// 
-// int main(int argc, char** argv) { 
-//   // Initialize the symbolizer to get a human-readable stack trace 
+// very early in your program, usually in the first few lines of main():
+//
+// int main(int argc, char** argv) {
+//   // Initialize the symbolizer to get a human-readable stack trace
 //   y_absl::InitializeSymbolizer(argv[0]);
-// 
+//
 //   y_absl::FailureSignalHandlerOptions options;
 //   y_absl::InstallFailureSignalHandler(options);
-//   DoSomethingInteresting(); 
-//   return 0; 
-// } 
-// 
-// Any program that raises a fatal signal (such as `SIGSEGV`, `SIGILL`, 
-// `SIGFPE`, `SIGABRT`, `SIGTERM`, `SIGBUG`, and `SIGTRAP`) will call the 
-// installed failure signal handler and provide debugging information to stderr. 
-// 
-// Note that you should *not* install the Abseil failure signal handler more 
-// than once. You may, of course, have another (non-Abseil) failure signal 
-// handler installed (which would be triggered if Abseil's failure signal 
-// handler sets `call_previous_handler` to `true`). 
- 
-#ifndef ABSL_DEBUGGING_FAILURE_SIGNAL_HANDLER_H_ 
-#define ABSL_DEBUGGING_FAILURE_SIGNAL_HANDLER_H_ 
- 
+//   DoSomethingInteresting();
+//   return 0;
+// }
+//
+// Any program that raises a fatal signal (such as `SIGSEGV`, `SIGILL`,
+// `SIGFPE`, `SIGABRT`, `SIGTERM`, `SIGBUG`, and `SIGTRAP`) will call the
+// installed failure signal handler and provide debugging information to stderr.
+//
+// Note that you should *not* install the Abseil failure signal handler more
+// than once. You may, of course, have another (non-Abseil) failure signal
+// handler installed (which would be triggered if Abseil's failure signal
+// handler sets `call_previous_handler` to `true`).
+
+#ifndef ABSL_DEBUGGING_FAILURE_SIGNAL_HANDLER_H_
+#define ABSL_DEBUGGING_FAILURE_SIGNAL_HANDLER_H_
+
 #include "y_absl/base/config.h"
 
 namespace y_absl {
 ABSL_NAMESPACE_BEGIN
- 
-// FailureSignalHandlerOptions 
-// 
+
+// FailureSignalHandlerOptions
+//
 // Struct for holding `y_absl::InstallFailureSignalHandler()` configuration
-// options. 
-struct FailureSignalHandlerOptions { 
-  // If true, try to symbolize the stacktrace emitted on failure, provided that 
-  // you have initialized a symbolizer for that purpose. (See symbolize.h for 
-  // more information.) 
-  bool symbolize_stacktrace = true; 
- 
-  // If true, try to run signal handlers on an alternate stack (if supported on 
-  // the given platform). An alternate stack is useful for program crashes due 
-  // to a stack overflow; by running on a alternate stack, the signal handler 
-  // may run even when normal stack space has been exausted. The downside of 
-  // using an alternate stack is that extra memory for the alternate stack needs 
-  // to be pre-allocated. 
-  bool use_alternate_stack = true; 
- 
-  // If positive, indicates the number of seconds after which the failure signal 
-  // handler is invoked to abort the program. Setting such an alarm is useful in 
-  // cases where the failure signal handler itself may become hung or 
-  // deadlocked. 
-  int alarm_on_failure_secs = 3; 
- 
-  // If true, call the previously registered signal handler for the signal that 
-  // was received (if one was registered) after the existing signal handler 
-  // runs. This mechanism can be used to chain signal handlers together. 
-  // 
-  // If false, the signal is raised to the default handler for that signal 
-  // (which normally terminates the program). 
-  // 
-  // IMPORTANT: If true, the chained fatal signal handlers must not try to 
-  // recover from the fatal signal. Instead, they should terminate the program 
-  // via some mechanism, like raising the default handler for the signal, or by 
-  // calling `_exit()`. Note that the failure signal handler may put parts of 
-  // the Abseil library into a state from which they cannot recover. 
-  bool call_previous_handler = false; 
- 
-  // If non-null, indicates a pointer to a callback function that will be called 
+// options.
+struct FailureSignalHandlerOptions {
+  // If true, try to symbolize the stacktrace emitted on failure, provided that
+  // you have initialized a symbolizer for that purpose. (See symbolize.h for
+  // more information.)
+  bool symbolize_stacktrace = true;
+
+  // If true, try to run signal handlers on an alternate stack (if supported on
+  // the given platform). An alternate stack is useful for program crashes due
+  // to a stack overflow; by running on a alternate stack, the signal handler
+  // may run even when normal stack space has been exausted. The downside of
+  // using an alternate stack is that extra memory for the alternate stack needs
+  // to be pre-allocated.
+  bool use_alternate_stack = true;
+
+  // If positive, indicates the number of seconds after which the failure signal
+  // handler is invoked to abort the program. Setting such an alarm is useful in
+  // cases where the failure signal handler itself may become hung or
+  // deadlocked.
+  int alarm_on_failure_secs = 3;
+
+  // If true, call the previously registered signal handler for the signal that
+  // was received (if one was registered) after the existing signal handler
+  // runs. This mechanism can be used to chain signal handlers together.
+  //
+  // If false, the signal is raised to the default handler for that signal
+  // (which normally terminates the program).
+  //
+  // IMPORTANT: If true, the chained fatal signal handlers must not try to
+  // recover from the fatal signal. Instead, they should terminate the program
+  // via some mechanism, like raising the default handler for the signal, or by
+  // calling `_exit()`. Note that the failure signal handler may put parts of
+  // the Abseil library into a state from which they cannot recover.
+  bool call_previous_handler = false;
+
+  // If non-null, indicates a pointer to a callback function that will be called
   // upon failure, with a string argument containing failure data. This function
-  // may be used as a hook to write failure data to a secondary location, such 
+  // may be used as a hook to write failure data to a secondary location, such
   // as a log file. This function will also be called with null data, as a hint
-  // to flush any buffered data before the program may be terminated. Consider 
-  // flushing any buffered data in all calls to this function. 
-  // 
-  // Since this function runs within a signal handler, it should be 
-  // async-signal-safe if possible. 
-  // See http://man7.org/linux/man-pages/man7/signal-safety.7.html 
-  void (*writerfn)(const char*) = nullptr; 
-}; 
- 
-// InstallFailureSignalHandler() 
-// 
-// Installs a signal handler for the common failure signals `SIGSEGV`, `SIGILL`, 
-// `SIGFPE`, `SIGABRT`, `SIGTERM`, `SIGBUG`, and `SIGTRAP` (provided they exist 
-// on the given platform). The failure signal handler dumps program failure data 
-// useful for debugging in an unspecified format to stderr. This data may 
-// include the program counter, a stacktrace, and register information on some 
-// systems; do not rely on an exact format for the output, as it is subject to 
-// change. 
-void InstallFailureSignalHandler(const FailureSignalHandlerOptions& options); 
- 
-namespace debugging_internal { 
-const char* FailureSignalToString(int signo); 
-}  // namespace debugging_internal 
- 
+  // to flush any buffered data before the program may be terminated. Consider
+  // flushing any buffered data in all calls to this function.
+  //
+  // Since this function runs within a signal handler, it should be
+  // async-signal-safe if possible.
+  // See http://man7.org/linux/man-pages/man7/signal-safety.7.html
+  void (*writerfn)(const char*) = nullptr;
+};
+
+// InstallFailureSignalHandler()
+//
+// Installs a signal handler for the common failure signals `SIGSEGV`, `SIGILL`,
+// `SIGFPE`, `SIGABRT`, `SIGTERM`, `SIGBUG`, and `SIGTRAP` (provided they exist
+// on the given platform). The failure signal handler dumps program failure data
+// useful for debugging in an unspecified format to stderr. This data may
+// include the program counter, a stacktrace, and register information on some
+// systems; do not rely on an exact format for the output, as it is subject to
+// change.
+void InstallFailureSignalHandler(const FailureSignalHandlerOptions& options);
+
+namespace debugging_internal {
+const char* FailureSignalToString(int signo);
+}  // namespace debugging_internal
+
 ABSL_NAMESPACE_END
 }  // namespace y_absl
- 
-#endif  // ABSL_DEBUGGING_FAILURE_SIGNAL_HANDLER_H_ 
+
+#endif  // ABSL_DEBUGGING_FAILURE_SIGNAL_HANDLER_H_
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/address_is_readable.cc b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/address_is_readable.cc
index 425bf0ef02..df217335ea 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/address_is_readable.cc
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/address_is_readable.cc
@@ -1,139 +1,139 @@
-// Copyright 2017 The Abseil Authors. 
-// 
-// Licensed under the Apache License, Version 2.0 (the "License"); 
-// you may not use this file except in compliance with the License. 
-// You may obtain a copy of the License at 
-// 
-//      https://www.apache.org/licenses/LICENSE-2.0 
-// 
-// Unless required by applicable law or agreed to in writing, software 
-// distributed under the License is distributed on an "AS IS" BASIS, 
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
-// See the License for the specific language governing permissions and 
-// limitations under the License. 
- 
-// base::AddressIsReadable() probes an address to see whether it is readable, 
-// without faulting. 
- 
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// base::AddressIsReadable() probes an address to see whether it is readable,
+// without faulting.
+
 #include "y_absl/debugging/internal/address_is_readable.h"
- 
-#if !defined(__linux__) || defined(__ANDROID__) 
- 
+
+#if !defined(__linux__) || defined(__ANDROID__)
+
 namespace y_absl {
 ABSL_NAMESPACE_BEGIN
-namespace debugging_internal { 
- 
-// On platforms other than Linux, just return true. 
-bool AddressIsReadable(const void* /* addr */) { return true; } 
- 
-}  // namespace debugging_internal 
+namespace debugging_internal {
+
+// On platforms other than Linux, just return true.
+bool AddressIsReadable(const void* /* addr */) { return true; }
+
+}  // namespace debugging_internal
 ABSL_NAMESPACE_END
 }  // namespace y_absl
- 
-#else 
- 
-#include <fcntl.h> 
-#include <sys/syscall.h> 
-#include <unistd.h> 
-
-#include <atomic> 
-#include <cerrno> 
-#include <cstdint> 
- 
+
+#else
+
+#include <fcntl.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+
+#include <atomic>
+#include <cerrno>
+#include <cstdint>
+
 #include "y_absl/base/internal/errno_saver.h"
 #include "y_absl/base/internal/raw_logging.h"
- 
+
 namespace y_absl {
 ABSL_NAMESPACE_BEGIN
-namespace debugging_internal { 
- 
-// Pack a pid and two file descriptors into a 64-bit word, 
-// using 16, 24, and 24 bits for each respectively. 
-static uint64_t Pack(uint64_t pid, uint64_t read_fd, uint64_t write_fd) { 
-  ABSL_RAW_CHECK((read_fd >> 24) == 0 && (write_fd >> 24) == 0, 
-                 "fd out of range"); 
-  return (pid << 48) | ((read_fd & 0xffffff) << 24) | (write_fd & 0xffffff); 
-} 
- 
-// Unpack x into a pid and two file descriptors, where x was created with 
-// Pack(). 
-static void Unpack(uint64_t x, int *pid, int *read_fd, int *write_fd) { 
-  *pid = x >> 48; 
-  *read_fd = (x >> 24) & 0xffffff; 
-  *write_fd = x & 0xffffff; 
-} 
- 
-// Return whether the byte at *addr is readable, without faulting. 
-// Save and restores errno.   Returns true on systems where 
-// unimplemented. 
-// This is a namespace-scoped variable for correct zero-initialization. 
-static std::atomic<uint64_t> pid_and_fds;  // initially 0, an invalid pid. 
-
-bool AddressIsReadable(const void *addr) { 
+namespace debugging_internal {
+
+// Pack a pid and two file descriptors into a 64-bit word,
+// using 16, 24, and 24 bits for each respectively.
+static uint64_t Pack(uint64_t pid, uint64_t read_fd, uint64_t write_fd) {
+  ABSL_RAW_CHECK((read_fd >> 24) == 0 && (write_fd >> 24) == 0,
+                 "fd out of range");
+  return (pid << 48) | ((read_fd & 0xffffff) << 24) | (write_fd & 0xffffff);
+}
+
+// Unpack x into a pid and two file descriptors, where x was created with
+// Pack().
+static void Unpack(uint64_t x, int *pid, int *read_fd, int *write_fd) {
+  *pid = x >> 48;
+  *read_fd = (x >> 24) & 0xffffff;
+  *write_fd = x & 0xffffff;
+}
+
+// Return whether the byte at *addr is readable, without faulting.
+// Save and restores errno.   Returns true on systems where
+// unimplemented.
+// This is a namespace-scoped variable for correct zero-initialization.
+static std::atomic<uint64_t> pid_and_fds;  // initially 0, an invalid pid.
+
+bool AddressIsReadable(const void *addr) {
   y_absl::base_internal::ErrnoSaver errno_saver;
-  // We test whether a byte is readable by using write().  Normally, this would 
-  // be done via a cached file descriptor to /dev/null, but linux fails to 
-  // check whether the byte is readable when the destination is /dev/null, so 
-  // we use a cached pipe.  We store the pid of the process that created the 
-  // pipe to handle the case where a process forks, and the child closes all 
-  // the file descriptors and then calls this routine.  This is not perfect: 
-  // the child could use the routine, then close all file descriptors and then 
-  // use this routine again.  But the likely use of this routine is when 
-  // crashing, to test the validity of pages when dumping the stack.  Beware 
-  // that we may leak file descriptors, but we're unlikely to leak many. 
-  int bytes_written; 
-  int current_pid = getpid() & 0xffff;   // we use only the low order 16 bits 
-  do {  // until we do not get EBADF trying to use file descriptors 
-    int pid; 
-    int read_fd; 
-    int write_fd; 
+  // We test whether a byte is readable by using write().  Normally, this would
+  // be done via a cached file descriptor to /dev/null, but linux fails to
+  // check whether the byte is readable when the destination is /dev/null, so
+  // we use a cached pipe.  We store the pid of the process that created the
+  // pipe to handle the case where a process forks, and the child closes all
+  // the file descriptors and then calls this routine.  This is not perfect:
+  // the child could use the routine, then close all file descriptors and then
+  // use this routine again.  But the likely use of this routine is when
+  // crashing, to test the validity of pages when dumping the stack.  Beware
+  // that we may leak file descriptors, but we're unlikely to leak many.
+  int bytes_written;
+  int current_pid = getpid() & 0xffff;   // we use only the low order 16 bits
+  do {  // until we do not get EBADF trying to use file descriptors
+    int pid;
+    int read_fd;
+    int write_fd;
     uint64_t local_pid_and_fds = pid_and_fds.load(std::memory_order_acquire);
-    Unpack(local_pid_and_fds, &pid, &read_fd, &write_fd); 
-    while (current_pid != pid) { 
-      int p[2]; 
-      // new pipe 
-      if (pipe(p) != 0) { 
-        ABSL_RAW_LOG(FATAL, "Failed to create pipe, errno=%d", errno); 
-      } 
-      fcntl(p[0], F_SETFD, FD_CLOEXEC); 
-      fcntl(p[1], F_SETFD, FD_CLOEXEC); 
-      uint64_t new_pid_and_fds = Pack(current_pid, p[0], p[1]); 
-      if (pid_and_fds.compare_exchange_strong( 
+    Unpack(local_pid_and_fds, &pid, &read_fd, &write_fd);
+    while (current_pid != pid) {
+      int p[2];
+      // new pipe
+      if (pipe(p) != 0) {
+        ABSL_RAW_LOG(FATAL, "Failed to create pipe, errno=%d", errno);
+      }
+      fcntl(p[0], F_SETFD, FD_CLOEXEC);
+      fcntl(p[1], F_SETFD, FD_CLOEXEC);
+      uint64_t new_pid_and_fds = Pack(current_pid, p[0], p[1]);
+      if (pid_and_fds.compare_exchange_strong(
               local_pid_and_fds, new_pid_and_fds, std::memory_order_release,
-              std::memory_order_relaxed)) { 
-        local_pid_and_fds = new_pid_and_fds;  // fds exposed to other threads 
-      } else {  // fds not exposed to other threads; we can close them. 
-        close(p[0]); 
-        close(p[1]); 
+              std::memory_order_relaxed)) {
+        local_pid_and_fds = new_pid_and_fds;  // fds exposed to other threads
+      } else {  // fds not exposed to other threads; we can close them.
+        close(p[0]);
+        close(p[1]);
         local_pid_and_fds = pid_and_fds.load(std::memory_order_acquire);
-      } 
-      Unpack(local_pid_and_fds, &pid, &read_fd, &write_fd); 
-    } 
-    errno = 0; 
-    // Use syscall(SYS_write, ...) instead of write() to prevent ASAN 
-    // and other checkers from complaining about accesses to arbitrary 
-    // memory. 
-    do { 
-      bytes_written = syscall(SYS_write, write_fd, addr, 1); 
-    } while (bytes_written == -1 && errno == EINTR); 
-    if (bytes_written == 1) {   // remove the byte from the pipe 
-      char c; 
-      while (read(read_fd, &c, 1) == -1 && errno == EINTR) { 
-      } 
-    } 
-    if (errno == EBADF) {  // Descriptors invalid. 
-      // If pid_and_fds contains the problematic file descriptors we just used, 
-      // this call will forget them, and the loop will try again. 
-      pid_and_fds.compare_exchange_strong(local_pid_and_fds, 0, 
+      }
+      Unpack(local_pid_and_fds, &pid, &read_fd, &write_fd);
+    }
+    errno = 0;
+    // Use syscall(SYS_write, ...) instead of write() to prevent ASAN
+    // and other checkers from complaining about accesses to arbitrary
+    // memory.
+    do {
+      bytes_written = syscall(SYS_write, write_fd, addr, 1);
+    } while (bytes_written == -1 && errno == EINTR);
+    if (bytes_written == 1) {   // remove the byte from the pipe
+      char c;
+      while (read(read_fd, &c, 1) == -1 && errno == EINTR) {
+      }
+    }
+    if (errno == EBADF) {  // Descriptors invalid.
+      // If pid_and_fds contains the problematic file descriptors we just used,
+      // this call will forget them, and the loop will try again.
+      pid_and_fds.compare_exchange_strong(local_pid_and_fds, 0,
                                           std::memory_order_release,
-                                          std::memory_order_relaxed); 
-    } 
-  } while (errno == EBADF); 
-  return bytes_written == 1; 
-} 
- 
-}  // namespace debugging_internal 
+                                          std::memory_order_relaxed);
+    }
+  } while (errno == EBADF);
+  return bytes_written == 1;
+}
+
+}  // namespace debugging_internal
 ABSL_NAMESPACE_END
 }  // namespace y_absl
- 
-#endif 
+
+#endif
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/address_is_readable.h b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/address_is_readable.h
index d59ae86167..279dcc640b 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/address_is_readable.h
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/address_is_readable.h
@@ -1,32 +1,32 @@
-// Copyright 2017 The Abseil Authors. 
-// 
-// Licensed under the Apache License, Version 2.0 (the "License"); 
-// you may not use this file except in compliance with the License. 
-// You may obtain a copy of the License at 
-// 
-//      https://www.apache.org/licenses/LICENSE-2.0 
-// 
-// Unless required by applicable law or agreed to in writing, software 
-// distributed under the License is distributed on an "AS IS" BASIS, 
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
-// See the License for the specific language governing permissions and 
-// limitations under the License. 
- 
-#ifndef ABSL_DEBUGGING_INTERNAL_ADDRESS_IS_READABLE_H_ 
-#define ABSL_DEBUGGING_INTERNAL_ADDRESS_IS_READABLE_H_ 
- 
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_DEBUGGING_INTERNAL_ADDRESS_IS_READABLE_H_
+#define ABSL_DEBUGGING_INTERNAL_ADDRESS_IS_READABLE_H_
+
 #include "y_absl/base/config.h"
 
 namespace y_absl {
 ABSL_NAMESPACE_BEGIN
-namespace debugging_internal { 
- 
-// Return whether the byte at *addr is readable, without faulting. 
-// Save and restores errno. 
-bool AddressIsReadable(const void *addr); 
- 
-}  // namespace debugging_internal 
+namespace debugging_internal {
+
+// Return whether the byte at *addr is readable, without faulting.
+// Save and restores errno.
+bool AddressIsReadable(const void *addr);
+
+}  // namespace debugging_internal
 ABSL_NAMESPACE_END
 }  // namespace y_absl
- 
-#endif  // ABSL_DEBUGGING_INTERNAL_ADDRESS_IS_READABLE_H_ 
+
+#endif  // ABSL_DEBUGGING_INTERNAL_ADDRESS_IS_READABLE_H_
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/demangle.cc b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/demangle.cc
index 1cfb081725..0a4daa2f5c 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/demangle.cc
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/demangle.cc
@@ -1,395 +1,395 @@
-// Copyright 2018 The Abseil Authors. 
-// 
-// Licensed under the Apache License, Version 2.0 (the "License"); 
-// you may not use this file except in compliance with the License. 
-// You may obtain a copy of the License at 
-// 
-//      https://www.apache.org/licenses/LICENSE-2.0 
-// 
-// Unless required by applicable law or agreed to in writing, software 
-// distributed under the License is distributed on an "AS IS" BASIS, 
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
-// See the License for the specific language governing permissions and 
-// limitations under the License. 
- 
-// For reference check out: 
-// https://itanium-cxx-abi.github.io/cxx-abi/abi.html#mangling 
-// 
-// Note that we only have partial C++11 support yet. 
- 
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// For reference check out:
+// https://itanium-cxx-abi.github.io/cxx-abi/abi.html#mangling
+//
+// Note that we only have partial C++11 support yet.
+
 #include "y_absl/debugging/internal/demangle.h"
- 
-#include <cstdint> 
-#include <cstdio> 
-#include <limits> 
- 
+
+#include <cstdint>
+#include <cstdio>
+#include <limits>
+
 namespace y_absl {
 ABSL_NAMESPACE_BEGIN
-namespace debugging_internal { 
- 
-typedef struct { 
-  const char *abbrev; 
-  const char *real_name; 
-  // Number of arguments in <expression> context, or 0 if disallowed. 
-  int arity; 
-} AbbrevPair; 
- 
-// List of operators from Itanium C++ ABI. 
-static const AbbrevPair kOperatorList[] = { 
-    // New has special syntax (not currently supported). 
-    {"nw", "new", 0}, 
-    {"na", "new[]", 0}, 
- 
-    // Works except that the 'gs' prefix is not supported. 
-    {"dl", "delete", 1}, 
-    {"da", "delete[]", 1}, 
- 
-    {"ps", "+", 1},  // "positive" 
-    {"ng", "-", 1},  // "negative" 
-    {"ad", "&", 1},  // "address-of" 
-    {"de", "*", 1},  // "dereference" 
-    {"co", "~", 1}, 
- 
-    {"pl", "+", 2}, 
-    {"mi", "-", 2}, 
-    {"ml", "*", 2}, 
-    {"dv", "/", 2}, 
-    {"rm", "%", 2}, 
-    {"an", "&", 2}, 
-    {"or", "|", 2}, 
-    {"eo", "^", 2}, 
-    {"aS", "=", 2}, 
-    {"pL", "+=", 2}, 
-    {"mI", "-=", 2}, 
-    {"mL", "*=", 2}, 
-    {"dV", "/=", 2}, 
-    {"rM", "%=", 2}, 
-    {"aN", "&=", 2}, 
-    {"oR", "|=", 2}, 
-    {"eO", "^=", 2}, 
-    {"ls", "<<", 2}, 
-    {"rs", ">>", 2}, 
-    {"lS", "<<=", 2}, 
-    {"rS", ">>=", 2}, 
-    {"eq", "==", 2}, 
-    {"ne", "!=", 2}, 
-    {"lt", "<", 2}, 
-    {"gt", ">", 2}, 
-    {"le", "<=", 2}, 
-    {"ge", ">=", 2}, 
-    {"nt", "!", 1}, 
-    {"aa", "&&", 2}, 
-    {"oo", "||", 2}, 
-    {"pp", "++", 1}, 
-    {"mm", "--", 1}, 
-    {"cm", ",", 2}, 
-    {"pm", "->*", 2}, 
-    {"pt", "->", 0},  // Special syntax 
-    {"cl", "()", 0},  // Special syntax 
-    {"ix", "[]", 2}, 
-    {"qu", "?", 3}, 
-    {"st", "sizeof", 0},  // Special syntax 
-    {"sz", "sizeof", 1},  // Not a real operator name, but used in expressions. 
-    {nullptr, nullptr, 0}, 
-}; 
- 
-// List of builtin types from Itanium C++ ABI. 
-// 
-// Invariant: only one- or two-character type abbreviations here. 
-static const AbbrevPair kBuiltinTypeList[] = { 
-    {"v", "void", 0}, 
-    {"w", "wchar_t", 0}, 
-    {"b", "bool", 0}, 
-    {"c", "char", 0}, 
-    {"a", "signed char", 0}, 
-    {"h", "unsigned char", 0}, 
-    {"s", "short", 0}, 
-    {"t", "unsigned short", 0}, 
-    {"i", "int", 0}, 
-    {"j", "unsigned int", 0}, 
-    {"l", "long", 0}, 
-    {"m", "unsigned long", 0}, 
-    {"x", "long long", 0}, 
-    {"y", "unsigned long long", 0}, 
-    {"n", "__int128", 0}, 
-    {"o", "unsigned __int128", 0}, 
-    {"f", "float", 0}, 
-    {"d", "double", 0}, 
-    {"e", "long double", 0}, 
-    {"g", "__float128", 0}, 
-    {"z", "ellipsis", 0}, 
- 
-    {"De", "decimal128", 0},      // IEEE 754r decimal floating point (128 bits) 
-    {"Dd", "decimal64", 0},       // IEEE 754r decimal floating point (64 bits) 
-    {"Dc", "decltype(auto)", 0}, 
-    {"Da", "auto", 0}, 
-    {"Dn", "std::nullptr_t", 0},  // i.e., decltype(nullptr) 
-    {"Df", "decimal32", 0},       // IEEE 754r decimal floating point (32 bits) 
-    {"Di", "char32_t", 0}, 
+namespace debugging_internal {
+
+typedef struct {
+  const char *abbrev;
+  const char *real_name;
+  // Number of arguments in <expression> context, or 0 if disallowed.
+  int arity;
+} AbbrevPair;
+
+// List of operators from Itanium C++ ABI.
+static const AbbrevPair kOperatorList[] = {
+    // New has special syntax (not currently supported).
+    {"nw", "new", 0},
+    {"na", "new[]", 0},
+
+    // Works except that the 'gs' prefix is not supported.
+    {"dl", "delete", 1},
+    {"da", "delete[]", 1},
+
+    {"ps", "+", 1},  // "positive"
+    {"ng", "-", 1},  // "negative"
+    {"ad", "&", 1},  // "address-of"
+    {"de", "*", 1},  // "dereference"
+    {"co", "~", 1},
+
+    {"pl", "+", 2},
+    {"mi", "-", 2},
+    {"ml", "*", 2},
+    {"dv", "/", 2},
+    {"rm", "%", 2},
+    {"an", "&", 2},
+    {"or", "|", 2},
+    {"eo", "^", 2},
+    {"aS", "=", 2},
+    {"pL", "+=", 2},
+    {"mI", "-=", 2},
+    {"mL", "*=", 2},
+    {"dV", "/=", 2},
+    {"rM", "%=", 2},
+    {"aN", "&=", 2},
+    {"oR", "|=", 2},
+    {"eO", "^=", 2},
+    {"ls", "<<", 2},
+    {"rs", ">>", 2},
+    {"lS", "<<=", 2},
+    {"rS", ">>=", 2},
+    {"eq", "==", 2},
+    {"ne", "!=", 2},
+    {"lt", "<", 2},
+    {"gt", ">", 2},
+    {"le", "<=", 2},
+    {"ge", ">=", 2},
+    {"nt", "!", 1},
+    {"aa", "&&", 2},
+    {"oo", "||", 2},
+    {"pp", "++", 1},
+    {"mm", "--", 1},
+    {"cm", ",", 2},
+    {"pm", "->*", 2},
+    {"pt", "->", 0},  // Special syntax
+    {"cl", "()", 0},  // Special syntax
+    {"ix", "[]", 2},
+    {"qu", "?", 3},
+    {"st", "sizeof", 0},  // Special syntax
+    {"sz", "sizeof", 1},  // Not a real operator name, but used in expressions.
+    {nullptr, nullptr, 0},
+};
+
+// List of builtin types from Itanium C++ ABI.
+//
+// Invariant: only one- or two-character type abbreviations here.
+static const AbbrevPair kBuiltinTypeList[] = {
+    {"v", "void", 0},
+    {"w", "wchar_t", 0},
+    {"b", "bool", 0},
+    {"c", "char", 0},
+    {"a", "signed char", 0},
+    {"h", "unsigned char", 0},
+    {"s", "short", 0},
+    {"t", "unsigned short", 0},
+    {"i", "int", 0},
+    {"j", "unsigned int", 0},
+    {"l", "long", 0},
+    {"m", "unsigned long", 0},
+    {"x", "long long", 0},
+    {"y", "unsigned long long", 0},
+    {"n", "__int128", 0},
+    {"o", "unsigned __int128", 0},
+    {"f", "float", 0},
+    {"d", "double", 0},
+    {"e", "long double", 0},
+    {"g", "__float128", 0},
+    {"z", "ellipsis", 0},
+
+    {"De", "decimal128", 0},      // IEEE 754r decimal floating point (128 bits)
+    {"Dd", "decimal64", 0},       // IEEE 754r decimal floating point (64 bits)
+    {"Dc", "decltype(auto)", 0},
+    {"Da", "auto", 0},
+    {"Dn", "std::nullptr_t", 0},  // i.e., decltype(nullptr)
+    {"Df", "decimal32", 0},       // IEEE 754r decimal floating point (32 bits)
+    {"Di", "char32_t", 0},
     {"Du", "char8_t", 0},
-    {"Ds", "char16_t", 0}, 
-    {"Dh", "float16", 0},         // IEEE 754r half-precision float (16 bits) 
-    {nullptr, nullptr, 0}, 
-}; 
- 
-// List of substitutions Itanium C++ ABI. 
-static const AbbrevPair kSubstitutionList[] = { 
-    {"St", "", 0}, 
-    {"Sa", "allocator", 0}, 
-    {"Sb", "basic_string", 0}, 
-    // std::basic_string<char, std::char_traits<char>,std::allocator<char> > 
-    {"Ss", "string", 0}, 
-    // std::basic_istream<char, std::char_traits<char> > 
-    {"Si", "istream", 0}, 
-    // std::basic_ostream<char, std::char_traits<char> > 
-    {"So", "ostream", 0}, 
-    // std::basic_iostream<char, std::char_traits<char> > 
-    {"Sd", "iostream", 0}, 
-    {nullptr, nullptr, 0}, 
-}; 
- 
-// State needed for demangling.  This struct is copied in almost every stack 
-// frame, so every byte counts. 
-typedef struct { 
-  int mangled_idx;                   // Cursor of mangled name. 
+    {"Ds", "char16_t", 0},
+    {"Dh", "float16", 0},         // IEEE 754r half-precision float (16 bits)
+    {nullptr, nullptr, 0},
+};
+
+// List of substitutions Itanium C++ ABI.
+static const AbbrevPair kSubstitutionList[] = {
+    {"St", "", 0},
+    {"Sa", "allocator", 0},
+    {"Sb", "basic_string", 0},
+    // std::basic_string<char, std::char_traits<char>,std::allocator<char> >
+    {"Ss", "string", 0},
+    // std::basic_istream<char, std::char_traits<char> >
+    {"Si", "istream", 0},
+    // std::basic_ostream<char, std::char_traits<char> >
+    {"So", "ostream", 0},
+    // std::basic_iostream<char, std::char_traits<char> >
+    {"Sd", "iostream", 0},
+    {nullptr, nullptr, 0},
+};
+
+// State needed for demangling.  This struct is copied in almost every stack
+// frame, so every byte counts.
+typedef struct {
+  int mangled_idx;                   // Cursor of mangled name.
   int out_cur_idx;                   // Cursor of output string.
-  int prev_name_idx;                 // For constructors/destructors. 
-  signed int prev_name_length : 16;  // For constructors/destructors. 
-  signed int nest_level : 15;        // For nested names. 
-  unsigned int append : 1;           // Append flag. 
-  // Note: for some reason MSVC can't pack "bool append : 1" into the same int 
-  // with the above two fields, so we use an int instead.  Amusingly it can pack 
-  // "signed bool" as expected, but relying on that to continue to be a legal 
-  // type seems ill-advised (as it's illegal in at least clang). 
-} ParseState; 
- 
-static_assert(sizeof(ParseState) == 4 * sizeof(int), 
-              "unexpected size of ParseState"); 
- 
-// One-off state for demangling that's not subject to backtracking -- either 
-// constant data, data that's intentionally immune to backtracking (steps), or 
-// data that would never be changed by backtracking anyway (recursion_depth). 
-// 
-// Only one copy of this exists for each call to Demangle, so the size of this 
-// struct is nearly inconsequential. 
-typedef struct { 
+  int prev_name_idx;                 // For constructors/destructors.
+  signed int prev_name_length : 16;  // For constructors/destructors.
+  signed int nest_level : 15;        // For nested names.
+  unsigned int append : 1;           // Append flag.
+  // Note: for some reason MSVC can't pack "bool append : 1" into the same int
+  // with the above two fields, so we use an int instead.  Amusingly it can pack
+  // "signed bool" as expected, but relying on that to continue to be a legal
+  // type seems ill-advised (as it's illegal in at least clang).
+} ParseState;
+
+static_assert(sizeof(ParseState) == 4 * sizeof(int),
+              "unexpected size of ParseState");
+
+// One-off state for demangling that's not subject to backtracking -- either
+// constant data, data that's intentionally immune to backtracking (steps), or
+// data that would never be changed by backtracking anyway (recursion_depth).
+//
+// Only one copy of this exists for each call to Demangle, so the size of this
+// struct is nearly inconsequential.
+typedef struct {
   const char *mangled_begin;  // Beginning of input string.
   char *out;                  // Beginning of output string.
-  int out_end_idx;            // One past last allowed output character. 
-  int recursion_depth;        // For stack exhaustion prevention. 
-  int steps;               // Cap how much work we'll do, regardless of depth. 
-  ParseState parse_state;  // Backtrackable state copied for most frames. 
-} State; 
- 
-namespace { 
-// Prevent deep recursion / stack exhaustion. 
-// Also prevent unbounded handling of complex inputs. 
-class ComplexityGuard { 
- public: 
-  explicit ComplexityGuard(State *state) : state_(state) { 
-    ++state->recursion_depth; 
-    ++state->steps; 
-  } 
-  ~ComplexityGuard() { --state_->recursion_depth; } 
- 
-  // 256 levels of recursion seems like a reasonable upper limit on depth. 
-  // 128 is not enough to demagle synthetic tests from demangle_unittest.txt: 
-  // "_ZaaZZZZ..." and "_ZaaZcvZcvZ..." 
-  static constexpr int kRecursionDepthLimit = 256; 
- 
-  // We're trying to pick a charitable upper-limit on how many parse steps are 
-  // necessary to handle something that a human could actually make use of. 
-  // This is mostly in place as a bound on how much work we'll do if we are 
-  // asked to demangle an mangled name from an untrusted source, so it should be 
-  // much larger than the largest expected symbol, but much smaller than the 
-  // amount of work we can do in, e.g., a second. 
-  // 
-  // Some real-world symbols from an arbitrary binary started failing between 
-  // 2^12 and 2^13, so we multiply the latter by an extra factor of 16 to set 
-  // the limit. 
-  // 
-  // Spending one second on 2^17 parse steps would require each step to take 
-  // 7.6us, or ~30000 clock cycles, so it's safe to say this can be done in 
-  // under a second. 
-  static constexpr int kParseStepsLimit = 1 << 17; 
- 
-  bool IsTooComplex() const { 
-    return state_->recursion_depth > kRecursionDepthLimit || 
-           state_->steps > kParseStepsLimit; 
-  } 
- 
- private: 
-  State *state_; 
-}; 
-}  // namespace 
- 
-// We don't use strlen() in libc since it's not guaranteed to be async 
-// signal safe. 
-static size_t StrLen(const char *str) { 
-  size_t len = 0; 
-  while (*str != '\0') { 
-    ++str; 
-    ++len; 
-  } 
-  return len; 
-} 
- 
-// Returns true if "str" has at least "n" characters remaining. 
-static bool AtLeastNumCharsRemaining(const char *str, int n) { 
-  for (int i = 0; i < n; ++i) { 
-    if (str[i] == '\0') { 
-      return false; 
-    } 
-  } 
-  return true; 
-} 
- 
-// Returns true if "str" has "prefix" as a prefix. 
-static bool StrPrefix(const char *str, const char *prefix) { 
-  size_t i = 0; 
-  while (str[i] != '\0' && prefix[i] != '\0' && str[i] == prefix[i]) { 
-    ++i; 
-  } 
-  return prefix[i] == '\0';  // Consumed everything in "prefix". 
-} 
- 
-static void InitState(State *state, const char *mangled, char *out, 
-                      int out_size) { 
-  state->mangled_begin = mangled; 
-  state->out = out; 
-  state->out_end_idx = out_size; 
-  state->recursion_depth = 0; 
-  state->steps = 0; 
- 
-  state->parse_state.mangled_idx = 0; 
-  state->parse_state.out_cur_idx = 0; 
-  state->parse_state.prev_name_idx = 0; 
-  state->parse_state.prev_name_length = -1; 
-  state->parse_state.nest_level = -1; 
-  state->parse_state.append = true; 
-} 
- 
-static inline const char *RemainingInput(State *state) { 
-  return &state->mangled_begin[state->parse_state.mangled_idx]; 
-} 
- 
-// Returns true and advances "mangled_idx" if we find "one_char_token" 
-// at "mangled_idx" position.  It is assumed that "one_char_token" does 
-// not contain '\0'. 
-static bool ParseOneCharToken(State *state, const char one_char_token) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  if (RemainingInput(state)[0] == one_char_token) { 
-    ++state->parse_state.mangled_idx; 
-    return true; 
-  } 
-  return false; 
-} 
- 
-// Returns true and advances "mangled_cur" if we find "two_char_token" 
-// at "mangled_cur" position.  It is assumed that "two_char_token" does 
-// not contain '\0'. 
-static bool ParseTwoCharToken(State *state, const char *two_char_token) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  if (RemainingInput(state)[0] == two_char_token[0] && 
-      RemainingInput(state)[1] == two_char_token[1]) { 
-    state->parse_state.mangled_idx += 2; 
-    return true; 
-  } 
-  return false; 
-} 
- 
-// Returns true and advances "mangled_cur" if we find any character in 
-// "char_class" at "mangled_cur" position. 
-static bool ParseCharClass(State *state, const char *char_class) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  if (RemainingInput(state)[0] == '\0') { 
-    return false; 
-  } 
-  const char *p = char_class; 
-  for (; *p != '\0'; ++p) { 
-    if (RemainingInput(state)[0] == *p) { 
-      ++state->parse_state.mangled_idx; 
-      return true; 
-    } 
-  } 
-  return false; 
-} 
- 
-static bool ParseDigit(State *state, int *digit) { 
-  char c = RemainingInput(state)[0]; 
-  if (ParseCharClass(state, "0123456789")) { 
-    if (digit != nullptr) { 
-      *digit = c - '0'; 
-    } 
-    return true; 
-  } 
-  return false; 
-} 
- 
-// This function is used for handling an optional non-terminal. 
-static bool Optional(bool /*status*/) { return true; } 
- 
-// This function is used for handling <non-terminal>+ syntax. 
-typedef bool (*ParseFunc)(State *); 
-static bool OneOrMore(ParseFunc parse_func, State *state) { 
-  if (parse_func(state)) { 
-    while (parse_func(state)) { 
-    } 
-    return true; 
-  } 
-  return false; 
-} 
- 
-// This function is used for handling <non-terminal>* syntax. The function 
-// always returns true and must be followed by a termination token or a 
-// terminating sequence not handled by parse_func (e.g. 
-// ParseOneCharToken(state, 'E')). 
-static bool ZeroOrMore(ParseFunc parse_func, State *state) { 
-  while (parse_func(state)) { 
-  } 
-  return true; 
-} 
- 
-// Append "str" at "out_cur_idx".  If there is an overflow, out_cur_idx is 
-// set to out_end_idx+1.  The output string is ensured to 
-// always terminate with '\0' as long as there is no overflow. 
-static void Append(State *state, const char *const str, const int length) { 
-  for (int i = 0; i < length; ++i) { 
-    if (state->parse_state.out_cur_idx + 1 < 
-        state->out_end_idx) {  // +1 for '\0' 
-      state->out[state->parse_state.out_cur_idx++] = str[i]; 
-    } else { 
-      // signal overflow 
-      state->parse_state.out_cur_idx = state->out_end_idx + 1; 
-      break; 
-    } 
-  } 
-  if (state->parse_state.out_cur_idx < state->out_end_idx) { 
-    state->out[state->parse_state.out_cur_idx] = 
-        '\0';  // Terminate it with '\0' 
-  } 
-} 
- 
-// We don't use equivalents in libc to avoid locale issues. 
-static bool IsLower(char c) { return c >= 'a' && c <= 'z'; } 
- 
-static bool IsAlpha(char c) { 
-  return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'); 
-} 
- 
-static bool IsDigit(char c) { return c >= '0' && c <= '9'; } 
- 
-// Returns true if "str" is a function clone suffix.  These suffixes are used 
-// by GCC 4.5.x and later versions (and our locally-modified version of GCC 
-// 4.4.x) to indicate functions which have been cloned during optimization. 
-// We treat any sequence (.<alpha>+.<digit>+)+ as a function clone suffix. 
+  int out_end_idx;            // One past last allowed output character.
+  int recursion_depth;        // For stack exhaustion prevention.
+  int steps;               // Cap how much work we'll do, regardless of depth.
+  ParseState parse_state;  // Backtrackable state copied for most frames.
+} State;
+
+namespace {
+// Prevent deep recursion / stack exhaustion.
+// Also prevent unbounded handling of complex inputs.
+class ComplexityGuard {
+ public:
+  explicit ComplexityGuard(State *state) : state_(state) {
+    ++state->recursion_depth;
+    ++state->steps;
+  }
+  ~ComplexityGuard() { --state_->recursion_depth; }
+
+  // 256 levels of recursion seems like a reasonable upper limit on depth.
+  // 128 is not enough to demagle synthetic tests from demangle_unittest.txt:
+  // "_ZaaZZZZ..." and "_ZaaZcvZcvZ..."
+  static constexpr int kRecursionDepthLimit = 256;
+
+  // We're trying to pick a charitable upper-limit on how many parse steps are
+  // necessary to handle something that a human could actually make use of.
+  // This is mostly in place as a bound on how much work we'll do if we are
+  // asked to demangle an mangled name from an untrusted source, so it should be
+  // much larger than the largest expected symbol, but much smaller than the
+  // amount of work we can do in, e.g., a second.
+  //
+  // Some real-world symbols from an arbitrary binary started failing between
+  // 2^12 and 2^13, so we multiply the latter by an extra factor of 16 to set
+  // the limit.
+  //
+  // Spending one second on 2^17 parse steps would require each step to take
+  // 7.6us, or ~30000 clock cycles, so it's safe to say this can be done in
+  // under a second.
+  static constexpr int kParseStepsLimit = 1 << 17;
+
+  bool IsTooComplex() const {
+    return state_->recursion_depth > kRecursionDepthLimit ||
+           state_->steps > kParseStepsLimit;
+  }
+
+ private:
+  State *state_;
+};
+}  // namespace
+
+// We don't use strlen() in libc since it's not guaranteed to be async
+// signal safe.
+static size_t StrLen(const char *str) {
+  size_t len = 0;
+  while (*str != '\0') {
+    ++str;
+    ++len;
+  }
+  return len;
+}
+
+// Returns true if "str" has at least "n" characters remaining.
+static bool AtLeastNumCharsRemaining(const char *str, int n) {
+  for (int i = 0; i < n; ++i) {
+    if (str[i] == '\0') {
+      return false;
+    }
+  }
+  return true;
+}
+
+// Returns true if "str" has "prefix" as a prefix.
+static bool StrPrefix(const char *str, const char *prefix) {
+  size_t i = 0;
+  while (str[i] != '\0' && prefix[i] != '\0' && str[i] == prefix[i]) {
+    ++i;
+  }
+  return prefix[i] == '\0';  // Consumed everything in "prefix".
+}
+
+static void InitState(State *state, const char *mangled, char *out,
+                      int out_size) {
+  state->mangled_begin = mangled;
+  state->out = out;
+  state->out_end_idx = out_size;
+  state->recursion_depth = 0;
+  state->steps = 0;
+
+  state->parse_state.mangled_idx = 0;
+  state->parse_state.out_cur_idx = 0;
+  state->parse_state.prev_name_idx = 0;
+  state->parse_state.prev_name_length = -1;
+  state->parse_state.nest_level = -1;
+  state->parse_state.append = true;
+}
+
+static inline const char *RemainingInput(State *state) {
+  return &state->mangled_begin[state->parse_state.mangled_idx];
+}
+
+// Returns true and advances "mangled_idx" if we find "one_char_token"
+// at "mangled_idx" position.  It is assumed that "one_char_token" does
+// not contain '\0'.
+static bool ParseOneCharToken(State *state, const char one_char_token) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  if (RemainingInput(state)[0] == one_char_token) {
+    ++state->parse_state.mangled_idx;
+    return true;
+  }
+  return false;
+}
+
+// Returns true and advances "mangled_cur" if we find "two_char_token"
+// at "mangled_cur" position.  It is assumed that "two_char_token" does
+// not contain '\0'.
+static bool ParseTwoCharToken(State *state, const char *two_char_token) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  if (RemainingInput(state)[0] == two_char_token[0] &&
+      RemainingInput(state)[1] == two_char_token[1]) {
+    state->parse_state.mangled_idx += 2;
+    return true;
+  }
+  return false;
+}
+
+// Returns true and advances "mangled_cur" if we find any character in
+// "char_class" at "mangled_cur" position.
+static bool ParseCharClass(State *state, const char *char_class) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  if (RemainingInput(state)[0] == '\0') {
+    return false;
+  }
+  const char *p = char_class;
+  for (; *p != '\0'; ++p) {
+    if (RemainingInput(state)[0] == *p) {
+      ++state->parse_state.mangled_idx;
+      return true;
+    }
+  }
+  return false;
+}
+
+static bool ParseDigit(State *state, int *digit) {
+  char c = RemainingInput(state)[0];
+  if (ParseCharClass(state, "0123456789")) {
+    if (digit != nullptr) {
+      *digit = c - '0';
+    }
+    return true;
+  }
+  return false;
+}
+
+// This function is used for handling an optional non-terminal.
+static bool Optional(bool /*status*/) { return true; }
+
+// This function is used for handling <non-terminal>+ syntax.
+typedef bool (*ParseFunc)(State *);
+static bool OneOrMore(ParseFunc parse_func, State *state) {
+  if (parse_func(state)) {
+    while (parse_func(state)) {
+    }
+    return true;
+  }
+  return false;
+}
+
+// This function is used for handling <non-terminal>* syntax. The function
+// always returns true and must be followed by a termination token or a
+// terminating sequence not handled by parse_func (e.g.
+// ParseOneCharToken(state, 'E')).
+static bool ZeroOrMore(ParseFunc parse_func, State *state) {
+  while (parse_func(state)) {
+  }
+  return true;
+}
+
+// Append "str" at "out_cur_idx".  If there is an overflow, out_cur_idx is
+// set to out_end_idx+1.  The output string is ensured to
+// always terminate with '\0' as long as there is no overflow.
+static void Append(State *state, const char *const str, const int length) {
+  for (int i = 0; i < length; ++i) {
+    if (state->parse_state.out_cur_idx + 1 <
+        state->out_end_idx) {  // +1 for '\0'
+      state->out[state->parse_state.out_cur_idx++] = str[i];
+    } else {
+      // signal overflow
+      state->parse_state.out_cur_idx = state->out_end_idx + 1;
+      break;
+    }
+  }
+  if (state->parse_state.out_cur_idx < state->out_end_idx) {
+    state->out[state->parse_state.out_cur_idx] =
+        '\0';  // Terminate it with '\0'
+  }
+}
+
+// We don't use equivalents in libc to avoid locale issues.
+static bool IsLower(char c) { return c >= 'a' && c <= 'z'; }
+
+static bool IsAlpha(char c) {
+  return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z');
+}
+
+static bool IsDigit(char c) { return c >= '0' && c <= '9'; }
+
+// Returns true if "str" is a function clone suffix.  These suffixes are used
+// by GCC 4.5.x and later versions (and our locally-modified version of GCC
+// 4.4.x) to indicate functions which have been cloned during optimization.
+// We treat any sequence (.<alpha>+.<digit>+)+ as a function clone suffix.
 // Additionally, '_' is allowed along with the alphanumeric sequence.
-static bool IsFunctionCloneSuffix(const char *str) { 
-  size_t i = 0; 
-  while (str[i] != '\0') { 
+static bool IsFunctionCloneSuffix(const char *str) {
+  size_t i = 0;
+  while (str[i] != '\0') {
     bool parsed = false;
     // Consume a single [.<alpha> | _]*[.<digit>]* sequence.
     if (str[i] == '.' && (IsAlpha(str[i + 1]) || str[i + 1] == '_')) {
@@ -398,705 +398,705 @@ static bool IsFunctionCloneSuffix(const char *str) {
       while (IsAlpha(str[i]) || str[i] == '_') {
         ++i;
       }
-    } 
+    }
     if (str[i] == '.' && IsDigit(str[i + 1])) {
       parsed = true;
       i += 2;
       while (IsDigit(str[i])) {
         ++i;
       }
-    } 
+    }
     if (!parsed)
-      return false; 
-  } 
-  return true;  // Consumed everything in "str". 
-} 
- 
-static bool EndsWith(State *state, const char chr) { 
-  return state->parse_state.out_cur_idx > 0 && 
+      return false;
+  }
+  return true;  // Consumed everything in "str".
+}
+
+static bool EndsWith(State *state, const char chr) {
+  return state->parse_state.out_cur_idx > 0 &&
          state->parse_state.out_cur_idx < state->out_end_idx &&
-         chr == state->out[state->parse_state.out_cur_idx - 1]; 
-} 
- 
-// Append "str" with some tweaks, iff "append" state is true. 
-static void MaybeAppendWithLength(State *state, const char *const str, 
-                                  const int length) { 
-  if (state->parse_state.append && length > 0) { 
-    // Append a space if the output buffer ends with '<' and "str" 
-    // starts with '<' to avoid <<<. 
-    if (str[0] == '<' && EndsWith(state, '<')) { 
-      Append(state, " ", 1); 
-    } 
+         chr == state->out[state->parse_state.out_cur_idx - 1];
+}
+
+// Append "str" with some tweaks, iff "append" state is true.
+static void MaybeAppendWithLength(State *state, const char *const str,
+                                  const int length) {
+  if (state->parse_state.append && length > 0) {
+    // Append a space if the output buffer ends with '<' and "str"
+    // starts with '<' to avoid <<<.
+    if (str[0] == '<' && EndsWith(state, '<')) {
+      Append(state, " ", 1);
+    }
     // Remember the last identifier name for ctors/dtors,
     // but only if we haven't yet overflown the buffer.
     if (state->parse_state.out_cur_idx < state->out_end_idx &&
         (IsAlpha(str[0]) || str[0] == '_')) {
-      state->parse_state.prev_name_idx = state->parse_state.out_cur_idx; 
-      state->parse_state.prev_name_length = length; 
-    } 
-    Append(state, str, length); 
-  } 
-} 
- 
-// Appends a positive decimal number to the output if appending is enabled. 
-static bool MaybeAppendDecimal(State *state, unsigned int val) { 
-  // Max {32-64}-bit unsigned int is 20 digits. 
-  constexpr size_t kMaxLength = 20; 
-  char buf[kMaxLength]; 
- 
-  // We can't use itoa or sprintf as neither is specified to be 
-  // async-signal-safe. 
-  if (state->parse_state.append) { 
-    // We can't have a one-before-the-beginning pointer, so instead start with 
-    // one-past-the-end and manipulate one character before the pointer. 
-    char *p = &buf[kMaxLength]; 
-    do {  // val=0 is the only input that should write a leading zero digit. 
-      *--p = (val % 10) + '0'; 
-      val /= 10; 
-    } while (p > buf && val != 0); 
- 
-    // 'p' landed on the last character we set.  How convenient. 
-    Append(state, p, kMaxLength - (p - buf)); 
-  } 
- 
-  return true; 
-} 
- 
-// A convenient wrapper around MaybeAppendWithLength(). 
-// Returns true so that it can be placed in "if" conditions. 
-static bool MaybeAppend(State *state, const char *const str) { 
-  if (state->parse_state.append) { 
-    int length = StrLen(str); 
-    MaybeAppendWithLength(state, str, length); 
-  } 
-  return true; 
-} 
- 
-// This function is used for handling nested names. 
-static bool EnterNestedName(State *state) { 
-  state->parse_state.nest_level = 0; 
-  return true; 
-} 
- 
-// This function is used for handling nested names. 
-static bool LeaveNestedName(State *state, int16_t prev_value) { 
-  state->parse_state.nest_level = prev_value; 
-  return true; 
-} 
- 
-// Disable the append mode not to print function parameters, etc. 
-static bool DisableAppend(State *state) { 
-  state->parse_state.append = false; 
-  return true; 
-} 
- 
-// Restore the append mode to the previous state. 
-static bool RestoreAppend(State *state, bool prev_value) { 
-  state->parse_state.append = prev_value; 
-  return true; 
-} 
- 
-// Increase the nest level for nested names. 
-static void MaybeIncreaseNestLevel(State *state) { 
-  if (state->parse_state.nest_level > -1) { 
-    ++state->parse_state.nest_level; 
-  } 
-} 
- 
-// Appends :: for nested names if necessary. 
-static void MaybeAppendSeparator(State *state) { 
-  if (state->parse_state.nest_level >= 1) { 
-    MaybeAppend(state, "::"); 
-  } 
-} 
- 
-// Cancel the last separator if necessary. 
-static void MaybeCancelLastSeparator(State *state) { 
-  if (state->parse_state.nest_level >= 1 && state->parse_state.append && 
-      state->parse_state.out_cur_idx >= 2) { 
-    state->parse_state.out_cur_idx -= 2; 
-    state->out[state->parse_state.out_cur_idx] = '\0'; 
-  } 
-} 
- 
-// Returns true if the identifier of the given length pointed to by 
-// "mangled_cur" is anonymous namespace. 
-static bool IdentifierIsAnonymousNamespace(State *state, int length) { 
-  // Returns true if "anon_prefix" is a proper prefix of "mangled_cur". 
-  static const char anon_prefix[] = "_GLOBAL__N_"; 
-  return (length > static_cast<int>(sizeof(anon_prefix) - 1) && 
-          StrPrefix(RemainingInput(state), anon_prefix)); 
-} 
- 
-// Forward declarations of our parsing functions. 
-static bool ParseMangledName(State *state); 
-static bool ParseEncoding(State *state); 
-static bool ParseName(State *state); 
-static bool ParseUnscopedName(State *state); 
-static bool ParseNestedName(State *state); 
-static bool ParsePrefix(State *state); 
-static bool ParseUnqualifiedName(State *state); 
-static bool ParseSourceName(State *state); 
-static bool ParseLocalSourceName(State *state); 
-static bool ParseUnnamedTypeName(State *state); 
-static bool ParseNumber(State *state, int *number_out); 
-static bool ParseFloatNumber(State *state); 
-static bool ParseSeqId(State *state); 
-static bool ParseIdentifier(State *state, int length); 
-static bool ParseOperatorName(State *state, int *arity); 
-static bool ParseSpecialName(State *state); 
-static bool ParseCallOffset(State *state); 
-static bool ParseNVOffset(State *state); 
-static bool ParseVOffset(State *state); 
-static bool ParseCtorDtorName(State *state); 
-static bool ParseDecltype(State *state); 
-static bool ParseType(State *state); 
-static bool ParseCVQualifiers(State *state); 
-static bool ParseBuiltinType(State *state); 
-static bool ParseFunctionType(State *state); 
-static bool ParseBareFunctionType(State *state); 
-static bool ParseClassEnumType(State *state); 
-static bool ParseArrayType(State *state); 
-static bool ParsePointerToMemberType(State *state); 
-static bool ParseTemplateParam(State *state); 
-static bool ParseTemplateTemplateParam(State *state); 
-static bool ParseTemplateArgs(State *state); 
-static bool ParseTemplateArg(State *state); 
-static bool ParseBaseUnresolvedName(State *state); 
-static bool ParseUnresolvedName(State *state); 
-static bool ParseExpression(State *state); 
-static bool ParseExprPrimary(State *state); 
-static bool ParseExprCastValue(State *state); 
-static bool ParseLocalName(State *state); 
-static bool ParseLocalNameSuffix(State *state); 
-static bool ParseDiscriminator(State *state); 
-static bool ParseSubstitution(State *state, bool accept_std); 
- 
-// Implementation note: the following code is a straightforward 
-// translation of the Itanium C++ ABI defined in BNF with a couple of 
-// exceptions. 
-// 
-// - Support GNU extensions not defined in the Itanium C++ ABI 
-// - <prefix> and <template-prefix> are combined to avoid infinite loop 
-// - Reorder patterns to shorten the code 
-// - Reorder patterns to give greedier functions precedence 
-//   We'll mark "Less greedy than" for these cases in the code 
-// 
-// Each parsing function changes the parse state and returns true on 
-// success, or returns false and doesn't change the parse state (note: 
-// the parse-steps counter increases regardless of success or failure). 
-// To ensure that the parse state isn't changed in the latter case, we 
-// save the original state before we call multiple parsing functions 
-// consecutively with &&, and restore it if unsuccessful.  See 
-// ParseEncoding() as an example of this convention.  We follow the 
-// convention throughout the code. 
-// 
-// Originally we tried to do demangling without following the full ABI 
-// syntax but it turned out we needed to follow the full syntax to 
-// parse complicated cases like nested template arguments.  Note that 
-// implementing a full-fledged demangler isn't trivial (libiberty's 
-// cp-demangle.c has +4300 lines). 
-// 
-// Note that (foo) in <(foo) ...> is a modifier to be ignored. 
-// 
-// Reference: 
-// - Itanium C++ ABI 
-//   <https://mentorembedded.github.io/cxx-abi/abi.html#mangling> 
- 
-// <mangled-name> ::= _Z <encoding> 
-static bool ParseMangledName(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  return ParseTwoCharToken(state, "_Z") && ParseEncoding(state); 
-} 
- 
-// <encoding> ::= <(function) name> <bare-function-type> 
-//            ::= <(data) name> 
-//            ::= <special-name> 
-static bool ParseEncoding(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  // Implementing the first two productions together as <name> 
-  // [<bare-function-type>] avoids exponential blowup of backtracking. 
-  // 
-  // Since Optional(...) can't fail, there's no need to copy the state for 
-  // backtracking. 
-  if (ParseName(state) && Optional(ParseBareFunctionType(state))) { 
-    return true; 
-  } 
- 
-  if (ParseSpecialName(state)) { 
-    return true; 
-  } 
-  return false; 
-} 
- 
-// <name> ::= <nested-name> 
-//        ::= <unscoped-template-name> <template-args> 
-//        ::= <unscoped-name> 
-//        ::= <local-name> 
-static bool ParseName(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  if (ParseNestedName(state) || ParseLocalName(state)) { 
-    return true; 
-  } 
- 
-  // We reorganize the productions to avoid re-parsing unscoped names. 
-  // - Inline <unscoped-template-name> productions: 
-  //   <name> ::= <substitution> <template-args> 
-  //          ::= <unscoped-name> <template-args> 
-  //          ::= <unscoped-name> 
-  // - Merge the two productions that start with unscoped-name: 
-  //   <name> ::= <unscoped-name> [<template-args>] 
- 
-  ParseState copy = state->parse_state; 
-  // "std<...>" isn't a valid name. 
-  if (ParseSubstitution(state, /*accept_std=*/false) && 
-      ParseTemplateArgs(state)) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  // Note there's no need to restore state after this since only the first 
-  // subparser can fail. 
-  return ParseUnscopedName(state) && Optional(ParseTemplateArgs(state)); 
-} 
- 
-// <unscoped-name> ::= <unqualified-name> 
-//                 ::= St <unqualified-name> 
-static bool ParseUnscopedName(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  if (ParseUnqualifiedName(state)) { 
-    return true; 
-  } 
- 
-  ParseState copy = state->parse_state; 
-  if (ParseTwoCharToken(state, "St") && MaybeAppend(state, "std::") && 
-      ParseUnqualifiedName(state)) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
-  return false; 
-} 
- 
-// <ref-qualifer> ::= R // lvalue method reference qualifier 
-//                ::= O // rvalue method reference qualifier 
-static inline bool ParseRefQualifier(State *state) { 
-  return ParseCharClass(state, "OR"); 
-} 
- 
-// <nested-name> ::= N [<CV-qualifiers>] [<ref-qualifier>] <prefix> 
-//                   <unqualified-name> E 
-//               ::= N [<CV-qualifiers>] [<ref-qualifier>] <template-prefix> 
-//                   <template-args> E 
-static bool ParseNestedName(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  ParseState copy = state->parse_state; 
-  if (ParseOneCharToken(state, 'N') && EnterNestedName(state) && 
-      Optional(ParseCVQualifiers(state)) && 
-      Optional(ParseRefQualifier(state)) && ParsePrefix(state) && 
-      LeaveNestedName(state, copy.nest_level) && 
-      ParseOneCharToken(state, 'E')) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
-  return false; 
-} 
- 
-// This part is tricky.  If we literally translate them to code, we'll 
-// end up infinite loop.  Hence we merge them to avoid the case. 
-// 
-// <prefix> ::= <prefix> <unqualified-name> 
-//          ::= <template-prefix> <template-args> 
-//          ::= <template-param> 
-//          ::= <substitution> 
-//          ::= # empty 
-// <template-prefix> ::= <prefix> <(template) unqualified-name> 
-//                   ::= <template-param> 
-//                   ::= <substitution> 
-static bool ParsePrefix(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  bool has_something = false; 
-  while (true) { 
-    MaybeAppendSeparator(state); 
-    if (ParseTemplateParam(state) || 
-        ParseSubstitution(state, /*accept_std=*/true) || 
-        ParseUnscopedName(state) || 
-        (ParseOneCharToken(state, 'M') && ParseUnnamedTypeName(state))) { 
-      has_something = true; 
-      MaybeIncreaseNestLevel(state); 
-      continue; 
-    } 
-    MaybeCancelLastSeparator(state); 
-    if (has_something && ParseTemplateArgs(state)) { 
-      return ParsePrefix(state); 
-    } else { 
-      break; 
-    } 
-  } 
-  return true; 
-} 
- 
-// <unqualified-name> ::= <operator-name> 
-//                    ::= <ctor-dtor-name> 
-//                    ::= <source-name> 
-//                    ::= <local-source-name> // GCC extension; see below. 
-//                    ::= <unnamed-type-name> 
-static bool ParseUnqualifiedName(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  return (ParseOperatorName(state, nullptr) || ParseCtorDtorName(state) || 
-          ParseSourceName(state) || ParseLocalSourceName(state) || 
-          ParseUnnamedTypeName(state)); 
-} 
- 
-// <source-name> ::= <positive length number> <identifier> 
-static bool ParseSourceName(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  ParseState copy = state->parse_state; 
-  int length = -1; 
-  if (ParseNumber(state, &length) && ParseIdentifier(state, length)) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
-  return false; 
-} 
- 
-// <local-source-name> ::= L <source-name> [<discriminator>] 
-// 
-// References: 
-//   https://gcc.gnu.org/bugzilla/show_bug.cgi?id=31775 
-//   https://gcc.gnu.org/viewcvs?view=rev&revision=124467 
-static bool ParseLocalSourceName(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  ParseState copy = state->parse_state; 
-  if (ParseOneCharToken(state, 'L') && ParseSourceName(state) && 
-      Optional(ParseDiscriminator(state))) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
-  return false; 
-} 
- 
-// <unnamed-type-name> ::= Ut [<(nonnegative) number>] _ 
-//                     ::= <closure-type-name> 
-// <closure-type-name> ::= Ul <lambda-sig> E [<(nonnegative) number>] _ 
-// <lambda-sig>        ::= <(parameter) type>+ 
-static bool ParseUnnamedTypeName(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  ParseState copy = state->parse_state; 
-  // Type's 1-based index n is encoded as { "", n == 1; itoa(n-2), otherwise }. 
-  // Optionally parse the encoded value into 'which' and add 2 to get the index. 
-  int which = -1; 
- 
-  // Unnamed type local to function or class. 
-  if (ParseTwoCharToken(state, "Ut") && Optional(ParseNumber(state, &which)) && 
-      which <= std::numeric_limits<int>::max() - 2 &&  // Don't overflow. 
-      ParseOneCharToken(state, '_')) { 
-    MaybeAppend(state, "{unnamed type#"); 
-    MaybeAppendDecimal(state, 2 + which); 
-    MaybeAppend(state, "}"); 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  // Closure type. 
-  which = -1; 
-  if (ParseTwoCharToken(state, "Ul") && DisableAppend(state) && 
-      OneOrMore(ParseType, state) && RestoreAppend(state, copy.append) && 
-      ParseOneCharToken(state, 'E') && Optional(ParseNumber(state, &which)) && 
-      which <= std::numeric_limits<int>::max() - 2 &&  // Don't overflow. 
-      ParseOneCharToken(state, '_')) { 
-    MaybeAppend(state, "{lambda()#"); 
-    MaybeAppendDecimal(state, 2 + which); 
-    MaybeAppend(state, "}"); 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  return false; 
-} 
- 
-// <number> ::= [n] <non-negative decimal integer> 
-// If "number_out" is non-null, then *number_out is set to the value of the 
-// parsed number on success. 
-static bool ParseNumber(State *state, int *number_out) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  bool negative = false; 
-  if (ParseOneCharToken(state, 'n')) { 
-    negative = true; 
-  } 
-  const char *p = RemainingInput(state); 
-  uint64_t number = 0; 
-  for (; *p != '\0'; ++p) { 
-    if (IsDigit(*p)) { 
-      number = number * 10 + (*p - '0'); 
-    } else { 
-      break; 
-    } 
-  } 
-  // Apply the sign with uint64_t arithmetic so overflows aren't UB.  Gives 
-  // "incorrect" results for out-of-range inputs, but negative values only 
-  // appear for literals, which aren't printed. 
-  if (negative) { 
-    number = ~number + 1; 
-  } 
-  if (p != RemainingInput(state)) {  // Conversion succeeded. 
-    state->parse_state.mangled_idx += p - RemainingInput(state); 
-    if (number_out != nullptr) { 
-      // Note: possibly truncate "number". 
-      *number_out = number; 
-    } 
-    return true; 
-  } 
-  return false; 
-} 
- 
-// Floating-point literals are encoded using a fixed-length lowercase 
-// hexadecimal string. 
-static bool ParseFloatNumber(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  const char *p = RemainingInput(state); 
-  for (; *p != '\0'; ++p) { 
-    if (!IsDigit(*p) && !(*p >= 'a' && *p <= 'f')) { 
-      break; 
-    } 
-  } 
-  if (p != RemainingInput(state)) {  // Conversion succeeded. 
-    state->parse_state.mangled_idx += p - RemainingInput(state); 
-    return true; 
-  } 
-  return false; 
-} 
- 
-// The <seq-id> is a sequence number in base 36, 
-// using digits and upper case letters 
-static bool ParseSeqId(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  const char *p = RemainingInput(state); 
-  for (; *p != '\0'; ++p) { 
-    if (!IsDigit(*p) && !(*p >= 'A' && *p <= 'Z')) { 
-      break; 
-    } 
-  } 
-  if (p != RemainingInput(state)) {  // Conversion succeeded. 
-    state->parse_state.mangled_idx += p - RemainingInput(state); 
-    return true; 
-  } 
-  return false; 
-} 
- 
-// <identifier> ::= <unqualified source code identifier> (of given length) 
-static bool ParseIdentifier(State *state, int length) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  if (length < 0 || !AtLeastNumCharsRemaining(RemainingInput(state), length)) { 
-    return false; 
-  } 
-  if (IdentifierIsAnonymousNamespace(state, length)) { 
-    MaybeAppend(state, "(anonymous namespace)"); 
-  } else { 
-    MaybeAppendWithLength(state, RemainingInput(state), length); 
-  } 
-  state->parse_state.mangled_idx += length; 
-  return true; 
-} 
- 
-// <operator-name> ::= nw, and other two letters cases 
-//                 ::= cv <type>  # (cast) 
-//                 ::= v  <digit> <source-name> # vendor extended operator 
-static bool ParseOperatorName(State *state, int *arity) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  if (!AtLeastNumCharsRemaining(RemainingInput(state), 2)) { 
-    return false; 
-  } 
-  // First check with "cv" (cast) case. 
-  ParseState copy = state->parse_state; 
-  if (ParseTwoCharToken(state, "cv") && MaybeAppend(state, "operator ") && 
-      EnterNestedName(state) && ParseType(state) && 
-      LeaveNestedName(state, copy.nest_level)) { 
-    if (arity != nullptr) { 
-      *arity = 1; 
-    } 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  // Then vendor extended operators. 
-  if (ParseOneCharToken(state, 'v') && ParseDigit(state, arity) && 
-      ParseSourceName(state)) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  // Other operator names should start with a lower alphabet followed 
-  // by a lower/upper alphabet. 
-  if (!(IsLower(RemainingInput(state)[0]) && 
-        IsAlpha(RemainingInput(state)[1]))) { 
-    return false; 
-  } 
-  // We may want to perform a binary search if we really need speed. 
-  const AbbrevPair *p; 
-  for (p = kOperatorList; p->abbrev != nullptr; ++p) { 
-    if (RemainingInput(state)[0] == p->abbrev[0] && 
-        RemainingInput(state)[1] == p->abbrev[1]) { 
-      if (arity != nullptr) { 
-        *arity = p->arity; 
-      } 
-      MaybeAppend(state, "operator"); 
-      if (IsLower(*p->real_name)) {  // new, delete, etc. 
-        MaybeAppend(state, " "); 
-      } 
-      MaybeAppend(state, p->real_name); 
-      state->parse_state.mangled_idx += 2; 
-      return true; 
-    } 
-  } 
-  return false; 
-} 
- 
-// <special-name> ::= TV <type> 
-//                ::= TT <type> 
-//                ::= TI <type> 
-//                ::= TS <type> 
+      state->parse_state.prev_name_idx = state->parse_state.out_cur_idx;
+      state->parse_state.prev_name_length = length;
+    }
+    Append(state, str, length);
+  }
+}
+
+// Appends a positive decimal number to the output if appending is enabled.
+static bool MaybeAppendDecimal(State *state, unsigned int val) {
+  // Max {32-64}-bit unsigned int is 20 digits.
+  constexpr size_t kMaxLength = 20;
+  char buf[kMaxLength];
+
+  // We can't use itoa or sprintf as neither is specified to be
+  // async-signal-safe.
+  if (state->parse_state.append) {
+    // We can't have a one-before-the-beginning pointer, so instead start with
+    // one-past-the-end and manipulate one character before the pointer.
+    char *p = &buf[kMaxLength];
+    do {  // val=0 is the only input that should write a leading zero digit.
+      *--p = (val % 10) + '0';
+      val /= 10;
+    } while (p > buf && val != 0);
+
+    // 'p' landed on the last character we set.  How convenient.
+    Append(state, p, kMaxLength - (p - buf));
+  }
+
+  return true;
+}
+
+// A convenient wrapper around MaybeAppendWithLength().
+// Returns true so that it can be placed in "if" conditions.
+static bool MaybeAppend(State *state, const char *const str) {
+  if (state->parse_state.append) {
+    int length = StrLen(str);
+    MaybeAppendWithLength(state, str, length);
+  }
+  return true;
+}
+
+// This function is used for handling nested names.
+static bool EnterNestedName(State *state) {
+  state->parse_state.nest_level = 0;
+  return true;
+}
+
+// This function is used for handling nested names.
+static bool LeaveNestedName(State *state, int16_t prev_value) {
+  state->parse_state.nest_level = prev_value;
+  return true;
+}
+
+// Disable the append mode not to print function parameters, etc.
+static bool DisableAppend(State *state) {
+  state->parse_state.append = false;
+  return true;
+}
+
+// Restore the append mode to the previous state.
+static bool RestoreAppend(State *state, bool prev_value) {
+  state->parse_state.append = prev_value;
+  return true;
+}
+
+// Increase the nest level for nested names.
+static void MaybeIncreaseNestLevel(State *state) {
+  if (state->parse_state.nest_level > -1) {
+    ++state->parse_state.nest_level;
+  }
+}
+
+// Appends :: for nested names if necessary.
+static void MaybeAppendSeparator(State *state) {
+  if (state->parse_state.nest_level >= 1) {
+    MaybeAppend(state, "::");
+  }
+}
+
+// Cancel the last separator if necessary.
+static void MaybeCancelLastSeparator(State *state) {
+  if (state->parse_state.nest_level >= 1 && state->parse_state.append &&
+      state->parse_state.out_cur_idx >= 2) {
+    state->parse_state.out_cur_idx -= 2;
+    state->out[state->parse_state.out_cur_idx] = '\0';
+  }
+}
+
+// Returns true if the identifier of the given length pointed to by
+// "mangled_cur" is anonymous namespace.
+static bool IdentifierIsAnonymousNamespace(State *state, int length) {
+  // Returns true if "anon_prefix" is a proper prefix of "mangled_cur".
+  static const char anon_prefix[] = "_GLOBAL__N_";
+  return (length > static_cast<int>(sizeof(anon_prefix) - 1) &&
+          StrPrefix(RemainingInput(state), anon_prefix));
+}
+
+// Forward declarations of our parsing functions.
+static bool ParseMangledName(State *state);
+static bool ParseEncoding(State *state);
+static bool ParseName(State *state);
+static bool ParseUnscopedName(State *state);
+static bool ParseNestedName(State *state);
+static bool ParsePrefix(State *state);
+static bool ParseUnqualifiedName(State *state);
+static bool ParseSourceName(State *state);
+static bool ParseLocalSourceName(State *state);
+static bool ParseUnnamedTypeName(State *state);
+static bool ParseNumber(State *state, int *number_out);
+static bool ParseFloatNumber(State *state);
+static bool ParseSeqId(State *state);
+static bool ParseIdentifier(State *state, int length);
+static bool ParseOperatorName(State *state, int *arity);
+static bool ParseSpecialName(State *state);
+static bool ParseCallOffset(State *state);
+static bool ParseNVOffset(State *state);
+static bool ParseVOffset(State *state);
+static bool ParseCtorDtorName(State *state);
+static bool ParseDecltype(State *state);
+static bool ParseType(State *state);
+static bool ParseCVQualifiers(State *state);
+static bool ParseBuiltinType(State *state);
+static bool ParseFunctionType(State *state);
+static bool ParseBareFunctionType(State *state);
+static bool ParseClassEnumType(State *state);
+static bool ParseArrayType(State *state);
+static bool ParsePointerToMemberType(State *state);
+static bool ParseTemplateParam(State *state);
+static bool ParseTemplateTemplateParam(State *state);
+static bool ParseTemplateArgs(State *state);
+static bool ParseTemplateArg(State *state);
+static bool ParseBaseUnresolvedName(State *state);
+static bool ParseUnresolvedName(State *state);
+static bool ParseExpression(State *state);
+static bool ParseExprPrimary(State *state);
+static bool ParseExprCastValue(State *state);
+static bool ParseLocalName(State *state);
+static bool ParseLocalNameSuffix(State *state);
+static bool ParseDiscriminator(State *state);
+static bool ParseSubstitution(State *state, bool accept_std);
+
+// Implementation note: the following code is a straightforward
+// translation of the Itanium C++ ABI defined in BNF with a couple of
+// exceptions.
+//
+// - Support GNU extensions not defined in the Itanium C++ ABI
+// - <prefix> and <template-prefix> are combined to avoid infinite loop
+// - Reorder patterns to shorten the code
+// - Reorder patterns to give greedier functions precedence
+//   We'll mark "Less greedy than" for these cases in the code
+//
+// Each parsing function changes the parse state and returns true on
+// success, or returns false and doesn't change the parse state (note:
+// the parse-steps counter increases regardless of success or failure).
+// To ensure that the parse state isn't changed in the latter case, we
+// save the original state before we call multiple parsing functions
+// consecutively with &&, and restore it if unsuccessful.  See
+// ParseEncoding() as an example of this convention.  We follow the
+// convention throughout the code.
+//
+// Originally we tried to do demangling without following the full ABI
+// syntax but it turned out we needed to follow the full syntax to
+// parse complicated cases like nested template arguments.  Note that
+// implementing a full-fledged demangler isn't trivial (libiberty's
+// cp-demangle.c has +4300 lines).
+//
+// Note that (foo) in <(foo) ...> is a modifier to be ignored.
+//
+// Reference:
+// - Itanium C++ ABI
+//   <https://mentorembedded.github.io/cxx-abi/abi.html#mangling>
+
+// <mangled-name> ::= _Z <encoding>
+static bool ParseMangledName(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  return ParseTwoCharToken(state, "_Z") && ParseEncoding(state);
+}
+
+// <encoding> ::= <(function) name> <bare-function-type>
+//            ::= <(data) name>
+//            ::= <special-name>
+static bool ParseEncoding(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  // Implementing the first two productions together as <name>
+  // [<bare-function-type>] avoids exponential blowup of backtracking.
+  //
+  // Since Optional(...) can't fail, there's no need to copy the state for
+  // backtracking.
+  if (ParseName(state) && Optional(ParseBareFunctionType(state))) {
+    return true;
+  }
+
+  if (ParseSpecialName(state)) {
+    return true;
+  }
+  return false;
+}
+
+// <name> ::= <nested-name>
+//        ::= <unscoped-template-name> <template-args>
+//        ::= <unscoped-name>
+//        ::= <local-name>
+static bool ParseName(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  if (ParseNestedName(state) || ParseLocalName(state)) {
+    return true;
+  }
+
+  // We reorganize the productions to avoid re-parsing unscoped names.
+  // - Inline <unscoped-template-name> productions:
+  //   <name> ::= <substitution> <template-args>
+  //          ::= <unscoped-name> <template-args>
+  //          ::= <unscoped-name>
+  // - Merge the two productions that start with unscoped-name:
+  //   <name> ::= <unscoped-name> [<template-args>]
+
+  ParseState copy = state->parse_state;
+  // "std<...>" isn't a valid name.
+  if (ParseSubstitution(state, /*accept_std=*/false) &&
+      ParseTemplateArgs(state)) {
+    return true;
+  }
+  state->parse_state = copy;
+
+  // Note there's no need to restore state after this since only the first
+  // subparser can fail.
+  return ParseUnscopedName(state) && Optional(ParseTemplateArgs(state));
+}
+
+// <unscoped-name> ::= <unqualified-name>
+//                 ::= St <unqualified-name>
+static bool ParseUnscopedName(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  if (ParseUnqualifiedName(state)) {
+    return true;
+  }
+
+  ParseState copy = state->parse_state;
+  if (ParseTwoCharToken(state, "St") && MaybeAppend(state, "std::") &&
+      ParseUnqualifiedName(state)) {
+    return true;
+  }
+  state->parse_state = copy;
+  return false;
+}
+
+// <ref-qualifer> ::= R // lvalue method reference qualifier
+//                ::= O // rvalue method reference qualifier
+static inline bool ParseRefQualifier(State *state) {
+  return ParseCharClass(state, "OR");
+}
+
+// <nested-name> ::= N [<CV-qualifiers>] [<ref-qualifier>] <prefix>
+//                   <unqualified-name> E
+//               ::= N [<CV-qualifiers>] [<ref-qualifier>] <template-prefix>
+//                   <template-args> E
+static bool ParseNestedName(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  ParseState copy = state->parse_state;
+  if (ParseOneCharToken(state, 'N') && EnterNestedName(state) &&
+      Optional(ParseCVQualifiers(state)) &&
+      Optional(ParseRefQualifier(state)) && ParsePrefix(state) &&
+      LeaveNestedName(state, copy.nest_level) &&
+      ParseOneCharToken(state, 'E')) {
+    return true;
+  }
+  state->parse_state = copy;
+  return false;
+}
+
+// This part is tricky.  If we literally translate them to code, we'll
+// end up infinite loop.  Hence we merge them to avoid the case.
+//
+// <prefix> ::= <prefix> <unqualified-name>
+//          ::= <template-prefix> <template-args>
+//          ::= <template-param>
+//          ::= <substitution>
+//          ::= # empty
+// <template-prefix> ::= <prefix> <(template) unqualified-name>
+//                   ::= <template-param>
+//                   ::= <substitution>
+static bool ParsePrefix(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  bool has_something = false;
+  while (true) {
+    MaybeAppendSeparator(state);
+    if (ParseTemplateParam(state) ||
+        ParseSubstitution(state, /*accept_std=*/true) ||
+        ParseUnscopedName(state) ||
+        (ParseOneCharToken(state, 'M') && ParseUnnamedTypeName(state))) {
+      has_something = true;
+      MaybeIncreaseNestLevel(state);
+      continue;
+    }
+    MaybeCancelLastSeparator(state);
+    if (has_something && ParseTemplateArgs(state)) {
+      return ParsePrefix(state);
+    } else {
+      break;
+    }
+  }
+  return true;
+}
+
+// <unqualified-name> ::= <operator-name>
+//                    ::= <ctor-dtor-name>
+//                    ::= <source-name>
+//                    ::= <local-source-name> // GCC extension; see below.
+//                    ::= <unnamed-type-name>
+static bool ParseUnqualifiedName(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  return (ParseOperatorName(state, nullptr) || ParseCtorDtorName(state) ||
+          ParseSourceName(state) || ParseLocalSourceName(state) ||
+          ParseUnnamedTypeName(state));
+}
+
+// <source-name> ::= <positive length number> <identifier>
+static bool ParseSourceName(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  ParseState copy = state->parse_state;
+  int length = -1;
+  if (ParseNumber(state, &length) && ParseIdentifier(state, length)) {
+    return true;
+  }
+  state->parse_state = copy;
+  return false;
+}
+
+// <local-source-name> ::= L <source-name> [<discriminator>]
+//
+// References:
+//   https://gcc.gnu.org/bugzilla/show_bug.cgi?id=31775
+//   https://gcc.gnu.org/viewcvs?view=rev&revision=124467
+static bool ParseLocalSourceName(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  ParseState copy = state->parse_state;
+  if (ParseOneCharToken(state, 'L') && ParseSourceName(state) &&
+      Optional(ParseDiscriminator(state))) {
+    return true;
+  }
+  state->parse_state = copy;
+  return false;
+}
+
+// <unnamed-type-name> ::= Ut [<(nonnegative) number>] _
+//                     ::= <closure-type-name>
+// <closure-type-name> ::= Ul <lambda-sig> E [<(nonnegative) number>] _
+// <lambda-sig>        ::= <(parameter) type>+
+static bool ParseUnnamedTypeName(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  ParseState copy = state->parse_state;
+  // Type's 1-based index n is encoded as { "", n == 1; itoa(n-2), otherwise }.
+  // Optionally parse the encoded value into 'which' and add 2 to get the index.
+  int which = -1;
+
+  // Unnamed type local to function or class.
+  if (ParseTwoCharToken(state, "Ut") && Optional(ParseNumber(state, &which)) &&
+      which <= std::numeric_limits<int>::max() - 2 &&  // Don't overflow.
+      ParseOneCharToken(state, '_')) {
+    MaybeAppend(state, "{unnamed type#");
+    MaybeAppendDecimal(state, 2 + which);
+    MaybeAppend(state, "}");
+    return true;
+  }
+  state->parse_state = copy;
+
+  // Closure type.
+  which = -1;
+  if (ParseTwoCharToken(state, "Ul") && DisableAppend(state) &&
+      OneOrMore(ParseType, state) && RestoreAppend(state, copy.append) &&
+      ParseOneCharToken(state, 'E') && Optional(ParseNumber(state, &which)) &&
+      which <= std::numeric_limits<int>::max() - 2 &&  // Don't overflow.
+      ParseOneCharToken(state, '_')) {
+    MaybeAppend(state, "{lambda()#");
+    MaybeAppendDecimal(state, 2 + which);
+    MaybeAppend(state, "}");
+    return true;
+  }
+  state->parse_state = copy;
+
+  return false;
+}
+
+// <number> ::= [n] <non-negative decimal integer>
+// If "number_out" is non-null, then *number_out is set to the value of the
+// parsed number on success.
+static bool ParseNumber(State *state, int *number_out) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  bool negative = false;
+  if (ParseOneCharToken(state, 'n')) {
+    negative = true;
+  }
+  const char *p = RemainingInput(state);
+  uint64_t number = 0;
+  for (; *p != '\0'; ++p) {
+    if (IsDigit(*p)) {
+      number = number * 10 + (*p - '0');
+    } else {
+      break;
+    }
+  }
+  // Apply the sign with uint64_t arithmetic so overflows aren't UB.  Gives
+  // "incorrect" results for out-of-range inputs, but negative values only
+  // appear for literals, which aren't printed.
+  if (negative) {
+    number = ~number + 1;
+  }
+  if (p != RemainingInput(state)) {  // Conversion succeeded.
+    state->parse_state.mangled_idx += p - RemainingInput(state);
+    if (number_out != nullptr) {
+      // Note: possibly truncate "number".
+      *number_out = number;
+    }
+    return true;
+  }
+  return false;
+}
+
+// Floating-point literals are encoded using a fixed-length lowercase
+// hexadecimal string.
+static bool ParseFloatNumber(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  const char *p = RemainingInput(state);
+  for (; *p != '\0'; ++p) {
+    if (!IsDigit(*p) && !(*p >= 'a' && *p <= 'f')) {
+      break;
+    }
+  }
+  if (p != RemainingInput(state)) {  // Conversion succeeded.
+    state->parse_state.mangled_idx += p - RemainingInput(state);
+    return true;
+  }
+  return false;
+}
+
+// The <seq-id> is a sequence number in base 36,
+// using digits and upper case letters
+static bool ParseSeqId(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  const char *p = RemainingInput(state);
+  for (; *p != '\0'; ++p) {
+    if (!IsDigit(*p) && !(*p >= 'A' && *p <= 'Z')) {
+      break;
+    }
+  }
+  if (p != RemainingInput(state)) {  // Conversion succeeded.
+    state->parse_state.mangled_idx += p - RemainingInput(state);
+    return true;
+  }
+  return false;
+}
+
+// <identifier> ::= <unqualified source code identifier> (of given length)
+static bool ParseIdentifier(State *state, int length) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  if (length < 0 || !AtLeastNumCharsRemaining(RemainingInput(state), length)) {
+    return false;
+  }
+  if (IdentifierIsAnonymousNamespace(state, length)) {
+    MaybeAppend(state, "(anonymous namespace)");
+  } else {
+    MaybeAppendWithLength(state, RemainingInput(state), length);
+  }
+  state->parse_state.mangled_idx += length;
+  return true;
+}
+
+// <operator-name> ::= nw, and other two letters cases
+//                 ::= cv <type>  # (cast)
+//                 ::= v  <digit> <source-name> # vendor extended operator
+static bool ParseOperatorName(State *state, int *arity) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  if (!AtLeastNumCharsRemaining(RemainingInput(state), 2)) {
+    return false;
+  }
+  // First check with "cv" (cast) case.
+  ParseState copy = state->parse_state;
+  if (ParseTwoCharToken(state, "cv") && MaybeAppend(state, "operator ") &&
+      EnterNestedName(state) && ParseType(state) &&
+      LeaveNestedName(state, copy.nest_level)) {
+    if (arity != nullptr) {
+      *arity = 1;
+    }
+    return true;
+  }
+  state->parse_state = copy;
+
+  // Then vendor extended operators.
+  if (ParseOneCharToken(state, 'v') && ParseDigit(state, arity) &&
+      ParseSourceName(state)) {
+    return true;
+  }
+  state->parse_state = copy;
+
+  // Other operator names should start with a lower alphabet followed
+  // by a lower/upper alphabet.
+  if (!(IsLower(RemainingInput(state)[0]) &&
+        IsAlpha(RemainingInput(state)[1]))) {
+    return false;
+  }
+  // We may want to perform a binary search if we really need speed.
+  const AbbrevPair *p;
+  for (p = kOperatorList; p->abbrev != nullptr; ++p) {
+    if (RemainingInput(state)[0] == p->abbrev[0] &&
+        RemainingInput(state)[1] == p->abbrev[1]) {
+      if (arity != nullptr) {
+        *arity = p->arity;
+      }
+      MaybeAppend(state, "operator");
+      if (IsLower(*p->real_name)) {  // new, delete, etc.
+        MaybeAppend(state, " ");
+      }
+      MaybeAppend(state, p->real_name);
+      state->parse_state.mangled_idx += 2;
+      return true;
+    }
+  }
+  return false;
+}
+
+// <special-name> ::= TV <type>
+//                ::= TT <type>
+//                ::= TI <type>
+//                ::= TS <type>
 //                ::= TH <type>  # thread-local
-//                ::= Tc <call-offset> <call-offset> <(base) encoding> 
-//                ::= GV <(object) name> 
-//                ::= T <call-offset> <(base) encoding> 
-// G++ extensions: 
-//                ::= TC <type> <(offset) number> _ <(base) type> 
-//                ::= TF <type> 
-//                ::= TJ <type> 
-//                ::= GR <name> 
-//                ::= GA <encoding> 
-//                ::= Th <call-offset> <(base) encoding> 
-//                ::= Tv <call-offset> <(base) encoding> 
-// 
-// Note: we don't care much about them since they don't appear in 
-// stack traces.  The are special data. 
-static bool ParseSpecialName(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  ParseState copy = state->parse_state; 
+//                ::= Tc <call-offset> <call-offset> <(base) encoding>
+//                ::= GV <(object) name>
+//                ::= T <call-offset> <(base) encoding>
+// G++ extensions:
+//                ::= TC <type> <(offset) number> _ <(base) type>
+//                ::= TF <type>
+//                ::= TJ <type>
+//                ::= GR <name>
+//                ::= GA <encoding>
+//                ::= Th <call-offset> <(base) encoding>
+//                ::= Tv <call-offset> <(base) encoding>
+//
+// Note: we don't care much about them since they don't appear in
+// stack traces.  The are special data.
+static bool ParseSpecialName(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  ParseState copy = state->parse_state;
   if (ParseOneCharToken(state, 'T') && ParseCharClass(state, "VTISH") &&
-      ParseType(state)) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  if (ParseTwoCharToken(state, "Tc") && ParseCallOffset(state) && 
-      ParseCallOffset(state) && ParseEncoding(state)) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  if (ParseTwoCharToken(state, "GV") && ParseName(state)) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  if (ParseOneCharToken(state, 'T') && ParseCallOffset(state) && 
-      ParseEncoding(state)) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  // G++ extensions 
-  if (ParseTwoCharToken(state, "TC") && ParseType(state) && 
-      ParseNumber(state, nullptr) && ParseOneCharToken(state, '_') && 
-      DisableAppend(state) && ParseType(state)) { 
-    RestoreAppend(state, copy.append); 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  if (ParseOneCharToken(state, 'T') && ParseCharClass(state, "FJ") && 
-      ParseType(state)) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  if (ParseTwoCharToken(state, "GR") && ParseName(state)) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  if (ParseTwoCharToken(state, "GA") && ParseEncoding(state)) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  if (ParseOneCharToken(state, 'T') && ParseCharClass(state, "hv") && 
-      ParseCallOffset(state) && ParseEncoding(state)) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
-  return false; 
-} 
- 
-// <call-offset> ::= h <nv-offset> _ 
-//               ::= v <v-offset> _ 
-static bool ParseCallOffset(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  ParseState copy = state->parse_state; 
-  if (ParseOneCharToken(state, 'h') && ParseNVOffset(state) && 
-      ParseOneCharToken(state, '_')) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  if (ParseOneCharToken(state, 'v') && ParseVOffset(state) && 
-      ParseOneCharToken(state, '_')) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  return false; 
-} 
- 
-// <nv-offset> ::= <(offset) number> 
-static bool ParseNVOffset(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  return ParseNumber(state, nullptr); 
-} 
- 
-// <v-offset>  ::= <(offset) number> _ <(virtual offset) number> 
-static bool ParseVOffset(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  ParseState copy = state->parse_state; 
-  if (ParseNumber(state, nullptr) && ParseOneCharToken(state, '_') && 
-      ParseNumber(state, nullptr)) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
-  return false; 
-} 
- 
+      ParseType(state)) {
+    return true;
+  }
+  state->parse_state = copy;
+
+  if (ParseTwoCharToken(state, "Tc") && ParseCallOffset(state) &&
+      ParseCallOffset(state) && ParseEncoding(state)) {
+    return true;
+  }
+  state->parse_state = copy;
+
+  if (ParseTwoCharToken(state, "GV") && ParseName(state)) {
+    return true;
+  }
+  state->parse_state = copy;
+
+  if (ParseOneCharToken(state, 'T') && ParseCallOffset(state) &&
+      ParseEncoding(state)) {
+    return true;
+  }
+  state->parse_state = copy;
+
+  // G++ extensions
+  if (ParseTwoCharToken(state, "TC") && ParseType(state) &&
+      ParseNumber(state, nullptr) && ParseOneCharToken(state, '_') &&
+      DisableAppend(state) && ParseType(state)) {
+    RestoreAppend(state, copy.append);
+    return true;
+  }
+  state->parse_state = copy;
+
+  if (ParseOneCharToken(state, 'T') && ParseCharClass(state, "FJ") &&
+      ParseType(state)) {
+    return true;
+  }
+  state->parse_state = copy;
+
+  if (ParseTwoCharToken(state, "GR") && ParseName(state)) {
+    return true;
+  }
+  state->parse_state = copy;
+
+  if (ParseTwoCharToken(state, "GA") && ParseEncoding(state)) {
+    return true;
+  }
+  state->parse_state = copy;
+
+  if (ParseOneCharToken(state, 'T') && ParseCharClass(state, "hv") &&
+      ParseCallOffset(state) && ParseEncoding(state)) {
+    return true;
+  }
+  state->parse_state = copy;
+  return false;
+}
+
+// <call-offset> ::= h <nv-offset> _
+//               ::= v <v-offset> _
+static bool ParseCallOffset(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  ParseState copy = state->parse_state;
+  if (ParseOneCharToken(state, 'h') && ParseNVOffset(state) &&
+      ParseOneCharToken(state, '_')) {
+    return true;
+  }
+  state->parse_state = copy;
+
+  if (ParseOneCharToken(state, 'v') && ParseVOffset(state) &&
+      ParseOneCharToken(state, '_')) {
+    return true;
+  }
+  state->parse_state = copy;
+
+  return false;
+}
+
+// <nv-offset> ::= <(offset) number>
+static bool ParseNVOffset(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  return ParseNumber(state, nullptr);
+}
+
+// <v-offset>  ::= <(offset) number> _ <(virtual offset) number>
+static bool ParseVOffset(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  ParseState copy = state->parse_state;
+  if (ParseNumber(state, nullptr) && ParseOneCharToken(state, '_') &&
+      ParseNumber(state, nullptr)) {
+    return true;
+  }
+  state->parse_state = copy;
+  return false;
+}
+
 // <ctor-dtor-name> ::= C1 | C2 | C3 | CI1 <base-class-type> | CI2
 // <base-class-type>
-//                  ::= D0 | D1 | D2 
-// # GCC extensions: "unified" constructor/destructor.  See 
+//                  ::= D0 | D1 | D2
+// # GCC extensions: "unified" constructor/destructor.  See
 // #
 // https://github.com/gcc-mirror/gcc/blob/7ad17b583c3643bd4557f29b8391ca7ef08391f5/gcc/cp/mangle.c#L1847
-//                  ::= C4 | D4 
-static bool ParseCtorDtorName(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  ParseState copy = state->parse_state; 
+//                  ::= C4 | D4
+static bool ParseCtorDtorName(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  ParseState copy = state->parse_state;
   if (ParseOneCharToken(state, 'C')) {
     if (ParseCharClass(state, "1234")) {
       const char *const prev_name =
@@ -1108,175 +1108,175 @@ static bool ParseCtorDtorName(State *state) {
                ParseClassEnumType(state)) {
       return true;
     }
-  } 
-  state->parse_state = copy; 
- 
-  if (ParseOneCharToken(state, 'D') && ParseCharClass(state, "0124")) { 
-    const char *const prev_name = state->out + state->parse_state.prev_name_idx; 
-    MaybeAppend(state, "~"); 
-    MaybeAppendWithLength(state, prev_name, 
-                          state->parse_state.prev_name_length); 
-    return true; 
-  } 
-  state->parse_state = copy; 
-  return false; 
-} 
- 
-// <decltype> ::= Dt <expression> E  # decltype of an id-expression or class 
-//                                   # member access (C++0x) 
-//            ::= DT <expression> E  # decltype of an expression (C++0x) 
-static bool ParseDecltype(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
- 
-  ParseState copy = state->parse_state; 
-  if (ParseOneCharToken(state, 'D') && ParseCharClass(state, "tT") && 
-      ParseExpression(state) && ParseOneCharToken(state, 'E')) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  return false; 
-} 
- 
-// <type> ::= <CV-qualifiers> <type> 
-//        ::= P <type>   # pointer-to 
-//        ::= R <type>   # reference-to 
-//        ::= O <type>   # rvalue reference-to (C++0x) 
-//        ::= C <type>   # complex pair (C 2000) 
-//        ::= G <type>   # imaginary (C 2000) 
-//        ::= U <source-name> <type>  # vendor extended type qualifier 
-//        ::= <builtin-type> 
-//        ::= <function-type> 
-//        ::= <class-enum-type>  # note: just an alias for <name> 
-//        ::= <array-type> 
-//        ::= <pointer-to-member-type> 
-//        ::= <template-template-param> <template-args> 
-//        ::= <template-param> 
-//        ::= <decltype> 
-//        ::= <substitution> 
-//        ::= Dp <type>          # pack expansion of (C++0x) 
+  }
+  state->parse_state = copy;
+
+  if (ParseOneCharToken(state, 'D') && ParseCharClass(state, "0124")) {
+    const char *const prev_name = state->out + state->parse_state.prev_name_idx;
+    MaybeAppend(state, "~");
+    MaybeAppendWithLength(state, prev_name,
+                          state->parse_state.prev_name_length);
+    return true;
+  }
+  state->parse_state = copy;
+  return false;
+}
+
+// <decltype> ::= Dt <expression> E  # decltype of an id-expression or class
+//                                   # member access (C++0x)
+//            ::= DT <expression> E  # decltype of an expression (C++0x)
+static bool ParseDecltype(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+
+  ParseState copy = state->parse_state;
+  if (ParseOneCharToken(state, 'D') && ParseCharClass(state, "tT") &&
+      ParseExpression(state) && ParseOneCharToken(state, 'E')) {
+    return true;
+  }
+  state->parse_state = copy;
+
+  return false;
+}
+
+// <type> ::= <CV-qualifiers> <type>
+//        ::= P <type>   # pointer-to
+//        ::= R <type>   # reference-to
+//        ::= O <type>   # rvalue reference-to (C++0x)
+//        ::= C <type>   # complex pair (C 2000)
+//        ::= G <type>   # imaginary (C 2000)
+//        ::= U <source-name> <type>  # vendor extended type qualifier
+//        ::= <builtin-type>
+//        ::= <function-type>
+//        ::= <class-enum-type>  # note: just an alias for <name>
+//        ::= <array-type>
+//        ::= <pointer-to-member-type>
+//        ::= <template-template-param> <template-args>
+//        ::= <template-param>
+//        ::= <decltype>
+//        ::= <substitution>
+//        ::= Dp <type>          # pack expansion of (C++0x)
 //        ::= Dv <num-elems> _   # GNU vector extension
-// 
-static bool ParseType(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  ParseState copy = state->parse_state; 
- 
-  // We should check CV-qualifers, and PRGC things first. 
-  // 
-  // CV-qualifiers overlap with some operator names, but an operator name is not 
-  // valid as a type.  To avoid an ambiguity that can lead to exponential time 
-  // complexity, refuse to backtrack the CV-qualifiers. 
-  // 
-  // _Z4aoeuIrMvvE 
-  //  => _Z 4aoeuI        rM  v     v   E 
-  //         aoeu<operator%=, void, void> 
-  //  => _Z 4aoeuI r Mv v              E 
-  //         aoeu<void void::* restrict> 
-  // 
-  // By consuming the CV-qualifiers first, the former parse is disabled. 
-  if (ParseCVQualifiers(state)) { 
-    const bool result = ParseType(state); 
-    if (!result) state->parse_state = copy; 
-    return result; 
-  } 
-  state->parse_state = copy; 
- 
-  // Similarly, these tag characters can overlap with other <name>s resulting in 
-  // two different parse prefixes that land on <template-args> in the same 
-  // place, such as "C3r1xI...".  So, disable the "ctor-name = C3" parse by 
-  // refusing to backtrack the tag characters. 
-  if (ParseCharClass(state, "OPRCG")) { 
-    const bool result = ParseType(state); 
-    if (!result) state->parse_state = copy; 
-    return result; 
-  } 
-  state->parse_state = copy; 
- 
-  if (ParseTwoCharToken(state, "Dp") && ParseType(state)) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  if (ParseOneCharToken(state, 'U') && ParseSourceName(state) && 
-      ParseType(state)) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  if (ParseBuiltinType(state) || ParseFunctionType(state) || 
-      ParseClassEnumType(state) || ParseArrayType(state) || 
-      ParsePointerToMemberType(state) || ParseDecltype(state) || 
-      // "std" on its own isn't a type. 
-      ParseSubstitution(state, /*accept_std=*/false)) { 
-    return true; 
-  } 
- 
-  if (ParseTemplateTemplateParam(state) && ParseTemplateArgs(state)) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  // Less greedy than <template-template-param> <template-args>. 
-  if (ParseTemplateParam(state)) { 
-    return true; 
-  } 
- 
+//
+static bool ParseType(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  ParseState copy = state->parse_state;
+
+  // We should check CV-qualifers, and PRGC things first.
+  //
+  // CV-qualifiers overlap with some operator names, but an operator name is not
+  // valid as a type.  To avoid an ambiguity that can lead to exponential time
+  // complexity, refuse to backtrack the CV-qualifiers.
+  //
+  // _Z4aoeuIrMvvE
+  //  => _Z 4aoeuI        rM  v     v   E
+  //         aoeu<operator%=, void, void>
+  //  => _Z 4aoeuI r Mv v              E
+  //         aoeu<void void::* restrict>
+  //
+  // By consuming the CV-qualifiers first, the former parse is disabled.
+  if (ParseCVQualifiers(state)) {
+    const bool result = ParseType(state);
+    if (!result) state->parse_state = copy;
+    return result;
+  }
+  state->parse_state = copy;
+
+  // Similarly, these tag characters can overlap with other <name>s resulting in
+  // two different parse prefixes that land on <template-args> in the same
+  // place, such as "C3r1xI...".  So, disable the "ctor-name = C3" parse by
+  // refusing to backtrack the tag characters.
+  if (ParseCharClass(state, "OPRCG")) {
+    const bool result = ParseType(state);
+    if (!result) state->parse_state = copy;
+    return result;
+  }
+  state->parse_state = copy;
+
+  if (ParseTwoCharToken(state, "Dp") && ParseType(state)) {
+    return true;
+  }
+  state->parse_state = copy;
+
+  if (ParseOneCharToken(state, 'U') && ParseSourceName(state) &&
+      ParseType(state)) {
+    return true;
+  }
+  state->parse_state = copy;
+
+  if (ParseBuiltinType(state) || ParseFunctionType(state) ||
+      ParseClassEnumType(state) || ParseArrayType(state) ||
+      ParsePointerToMemberType(state) || ParseDecltype(state) ||
+      // "std" on its own isn't a type.
+      ParseSubstitution(state, /*accept_std=*/false)) {
+    return true;
+  }
+
+  if (ParseTemplateTemplateParam(state) && ParseTemplateArgs(state)) {
+    return true;
+  }
+  state->parse_state = copy;
+
+  // Less greedy than <template-template-param> <template-args>.
+  if (ParseTemplateParam(state)) {
+    return true;
+  }
+
   if (ParseTwoCharToken(state, "Dv") && ParseNumber(state, nullptr) &&
       ParseOneCharToken(state, '_')) {
     return true;
   }
   state->parse_state = copy;
 
-  return false; 
-} 
- 
-// <CV-qualifiers> ::= [r] [V] [K] 
-// We don't allow empty <CV-qualifiers> to avoid infinite loop in 
-// ParseType(). 
-static bool ParseCVQualifiers(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  int num_cv_qualifiers = 0; 
-  num_cv_qualifiers += ParseOneCharToken(state, 'r'); 
-  num_cv_qualifiers += ParseOneCharToken(state, 'V'); 
-  num_cv_qualifiers += ParseOneCharToken(state, 'K'); 
-  return num_cv_qualifiers > 0; 
-} 
- 
-// <builtin-type> ::= v, etc.  # single-character builtin types 
-//                ::= u <source-name> 
-//                ::= Dd, etc.  # two-character builtin types 
-// 
-// Not supported: 
-//                ::= DF <number> _ # _FloatN (N bits) 
-// 
-static bool ParseBuiltinType(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  const AbbrevPair *p; 
-  for (p = kBuiltinTypeList; p->abbrev != nullptr; ++p) { 
-    // Guaranteed only 1- or 2-character strings in kBuiltinTypeList. 
-    if (p->abbrev[1] == '\0') { 
-      if (ParseOneCharToken(state, p->abbrev[0])) { 
-        MaybeAppend(state, p->real_name); 
-        return true; 
-      } 
-    } else if (p->abbrev[2] == '\0' && ParseTwoCharToken(state, p->abbrev)) { 
-      MaybeAppend(state, p->real_name); 
-      return true; 
-    } 
-  } 
- 
-  ParseState copy = state->parse_state; 
-  if (ParseOneCharToken(state, 'u') && ParseSourceName(state)) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
-  return false; 
-} 
- 
+  return false;
+}
+
+// <CV-qualifiers> ::= [r] [V] [K]
+// We don't allow empty <CV-qualifiers> to avoid infinite loop in
+// ParseType().
+static bool ParseCVQualifiers(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  int num_cv_qualifiers = 0;
+  num_cv_qualifiers += ParseOneCharToken(state, 'r');
+  num_cv_qualifiers += ParseOneCharToken(state, 'V');
+  num_cv_qualifiers += ParseOneCharToken(state, 'K');
+  return num_cv_qualifiers > 0;
+}
+
+// <builtin-type> ::= v, etc.  # single-character builtin types
+//                ::= u <source-name>
+//                ::= Dd, etc.  # two-character builtin types
+//
+// Not supported:
+//                ::= DF <number> _ # _FloatN (N bits)
+//
+static bool ParseBuiltinType(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  const AbbrevPair *p;
+  for (p = kBuiltinTypeList; p->abbrev != nullptr; ++p) {
+    // Guaranteed only 1- or 2-character strings in kBuiltinTypeList.
+    if (p->abbrev[1] == '\0') {
+      if (ParseOneCharToken(state, p->abbrev[0])) {
+        MaybeAppend(state, p->real_name);
+        return true;
+      }
+    } else if (p->abbrev[2] == '\0' && ParseTwoCharToken(state, p->abbrev)) {
+      MaybeAppend(state, p->real_name);
+      return true;
+    }
+  }
+
+  ParseState copy = state->parse_state;
+  if (ParseOneCharToken(state, 'u') && ParseSourceName(state)) {
+    return true;
+  }
+  state->parse_state = copy;
+  return false;
+}
+
 //  <exception-spec> ::= Do                # non-throwing
 //                                           exception-specification (e.g.,
 //                                           noexcept, throw())
@@ -1306,349 +1306,349 @@ static bool ParseExceptionSpec(State *state) {
 }
 
 // <function-type> ::= [exception-spec] F [Y] <bare-function-type> [O] E
-static bool ParseFunctionType(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  ParseState copy = state->parse_state; 
+static bool ParseFunctionType(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  ParseState copy = state->parse_state;
   if (Optional(ParseExceptionSpec(state)) && ParseOneCharToken(state, 'F') &&
-      Optional(ParseOneCharToken(state, 'Y')) && ParseBareFunctionType(state) && 
+      Optional(ParseOneCharToken(state, 'Y')) && ParseBareFunctionType(state) &&
       Optional(ParseOneCharToken(state, 'O')) &&
-      ParseOneCharToken(state, 'E')) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
-  return false; 
-} 
- 
-// <bare-function-type> ::= <(signature) type>+ 
-static bool ParseBareFunctionType(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  ParseState copy = state->parse_state; 
-  DisableAppend(state); 
-  if (OneOrMore(ParseType, state)) { 
-    RestoreAppend(state, copy.append); 
-    MaybeAppend(state, "()"); 
-    return true; 
-  } 
-  state->parse_state = copy; 
-  return false; 
-} 
- 
-// <class-enum-type> ::= <name> 
-static bool ParseClassEnumType(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  return ParseName(state); 
-} 
- 
-// <array-type> ::= A <(positive dimension) number> _ <(element) type> 
-//              ::= A [<(dimension) expression>] _ <(element) type> 
-static bool ParseArrayType(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  ParseState copy = state->parse_state; 
-  if (ParseOneCharToken(state, 'A') && ParseNumber(state, nullptr) && 
-      ParseOneCharToken(state, '_') && ParseType(state)) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  if (ParseOneCharToken(state, 'A') && Optional(ParseExpression(state)) && 
-      ParseOneCharToken(state, '_') && ParseType(state)) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
-  return false; 
-} 
- 
-// <pointer-to-member-type> ::= M <(class) type> <(member) type> 
-static bool ParsePointerToMemberType(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  ParseState copy = state->parse_state; 
-  if (ParseOneCharToken(state, 'M') && ParseType(state) && ParseType(state)) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
-  return false; 
-} 
- 
-// <template-param> ::= T_ 
-//                  ::= T <parameter-2 non-negative number> _ 
-static bool ParseTemplateParam(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  if (ParseTwoCharToken(state, "T_")) { 
-    MaybeAppend(state, "?");  // We don't support template substitutions. 
-    return true; 
-  } 
- 
-  ParseState copy = state->parse_state; 
-  if (ParseOneCharToken(state, 'T') && ParseNumber(state, nullptr) && 
-      ParseOneCharToken(state, '_')) { 
-    MaybeAppend(state, "?");  // We don't support template substitutions. 
-    return true; 
-  } 
-  state->parse_state = copy; 
-  return false; 
-} 
- 
-// <template-template-param> ::= <template-param> 
-//                           ::= <substitution> 
-static bool ParseTemplateTemplateParam(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  return (ParseTemplateParam(state) || 
-          // "std" on its own isn't a template. 
-          ParseSubstitution(state, /*accept_std=*/false)); 
-} 
- 
-// <template-args> ::= I <template-arg>+ E 
-static bool ParseTemplateArgs(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  ParseState copy = state->parse_state; 
-  DisableAppend(state); 
-  if (ParseOneCharToken(state, 'I') && OneOrMore(ParseTemplateArg, state) && 
-      ParseOneCharToken(state, 'E')) { 
-    RestoreAppend(state, copy.append); 
-    MaybeAppend(state, "<>"); 
-    return true; 
-  } 
-  state->parse_state = copy; 
-  return false; 
-} 
- 
-// <template-arg>  ::= <type> 
-//                 ::= <expr-primary> 
-//                 ::= J <template-arg>* E        # argument pack 
-//                 ::= X <expression> E 
-static bool ParseTemplateArg(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  ParseState copy = state->parse_state; 
-  if (ParseOneCharToken(state, 'J') && ZeroOrMore(ParseTemplateArg, state) && 
-      ParseOneCharToken(state, 'E')) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  // There can be significant overlap between the following leading to 
-  // exponential backtracking: 
-  // 
-  //   <expr-primary> ::= L <type> <expr-cast-value> E 
-  //                 e.g. L 2xxIvE 1                 E 
-  //   <type>         ==> <local-source-name> <template-args> 
-  //                 e.g. L 2xx               IvE 
-  // 
-  // This means parsing an entire <type> twice, and <type> can contain 
-  // <template-arg>, so this can generate exponential backtracking.  There is 
-  // only overlap when the remaining input starts with "L <source-name>", so 
-  // parse all cases that can start this way jointly to share the common prefix. 
-  // 
-  // We have: 
-  // 
-  //   <template-arg> ::= <type> 
-  //                  ::= <expr-primary> 
-  // 
-  // First, drop all the productions of <type> that must start with something 
-  // other than 'L'.  All that's left is <class-enum-type>; inline it. 
-  // 
-  //   <type> ::= <nested-name> # starts with 'N' 
-  //          ::= <unscoped-name> 
-  //          ::= <unscoped-template-name> <template-args> 
-  //          ::= <local-name> # starts with 'Z' 
-  // 
-  // Drop and inline again: 
-  // 
-  //   <type> ::= <unscoped-name> 
-  //          ::= <unscoped-name> <template-args> 
-  //          ::= <substitution> <template-args> # starts with 'S' 
-  // 
-  // Merge the first two, inline <unscoped-name>, drop last: 
-  // 
-  //   <type> ::= <unqualified-name> [<template-args>] 
-  //          ::= St <unqualified-name> [<template-args>] # starts with 'S' 
-  // 
-  // Drop and inline: 
-  // 
-  //   <type> ::= <operator-name> [<template-args>] # starts with lowercase 
-  //          ::= <ctor-dtor-name> [<template-args>] # starts with 'C' or 'D' 
-  //          ::= <source-name> [<template-args>] # starts with digit 
-  //          ::= <local-source-name> [<template-args>] 
-  //          ::= <unnamed-type-name> [<template-args>] # starts with 'U' 
-  // 
-  // One more time: 
-  // 
-  //   <type> ::= L <source-name> [<template-args>] 
-  // 
-  // Likewise with <expr-primary>: 
-  // 
-  //   <expr-primary> ::= L <type> <expr-cast-value> E 
-  //                  ::= LZ <encoding> E # cannot overlap; drop 
-  //                  ::= L <mangled_name> E # cannot overlap; drop 
-  // 
-  // By similar reasoning as shown above, the only <type>s starting with 
-  // <source-name> are "<source-name> [<template-args>]".  Inline this. 
-  // 
-  //   <expr-primary> ::= L <source-name> [<template-args>] <expr-cast-value> E 
-  // 
-  // Now inline both of these into <template-arg>: 
-  // 
-  //   <template-arg> ::= L <source-name> [<template-args>] 
-  //                  ::= L <source-name> [<template-args>] <expr-cast-value> E 
-  // 
-  // Merge them and we're done: 
-  //   <template-arg> 
-  //     ::= L <source-name> [<template-args>] [<expr-cast-value> E] 
-  if (ParseLocalSourceName(state) && Optional(ParseTemplateArgs(state))) { 
-    copy = state->parse_state; 
-    if (ParseExprCastValue(state) && ParseOneCharToken(state, 'E')) { 
-      return true; 
-    } 
-    state->parse_state = copy; 
-    return true; 
-  } 
- 
-  // Now that the overlapping cases can't reach this code, we can safely call 
-  // both of these. 
-  if (ParseType(state) || ParseExprPrimary(state)) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  if (ParseOneCharToken(state, 'X') && ParseExpression(state) && 
-      ParseOneCharToken(state, 'E')) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
-  return false; 
-} 
- 
-// <unresolved-type> ::= <template-param> [<template-args>] 
-//                   ::= <decltype> 
-//                   ::= <substitution> 
-static inline bool ParseUnresolvedType(State *state) { 
-  // No ComplexityGuard because we don't copy the state in this stack frame. 
-  return (ParseTemplateParam(state) && Optional(ParseTemplateArgs(state))) || 
-         ParseDecltype(state) || ParseSubstitution(state, /*accept_std=*/false); 
-} 
- 
-// <simple-id> ::= <source-name> [<template-args>] 
-static inline bool ParseSimpleId(State *state) { 
-  // No ComplexityGuard because we don't copy the state in this stack frame. 
- 
-  // Note: <simple-id> cannot be followed by a parameter pack; see comment in 
-  // ParseUnresolvedType. 
-  return ParseSourceName(state) && Optional(ParseTemplateArgs(state)); 
-} 
- 
-// <base-unresolved-name> ::= <source-name> [<template-args>] 
-//                        ::= on <operator-name> [<template-args>] 
-//                        ::= dn <destructor-name> 
-static bool ParseBaseUnresolvedName(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
- 
-  if (ParseSimpleId(state)) { 
-    return true; 
-  } 
- 
-  ParseState copy = state->parse_state; 
-  if (ParseTwoCharToken(state, "on") && ParseOperatorName(state, nullptr) && 
-      Optional(ParseTemplateArgs(state))) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  if (ParseTwoCharToken(state, "dn") && 
-      (ParseUnresolvedType(state) || ParseSimpleId(state))) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  return false; 
-} 
- 
-// <unresolved-name> ::= [gs] <base-unresolved-name> 
-//                   ::= sr <unresolved-type> <base-unresolved-name> 
-//                   ::= srN <unresolved-type> <unresolved-qualifier-level>+ E 
-//                         <base-unresolved-name> 
-//                   ::= [gs] sr <unresolved-qualifier-level>+ E 
-//                         <base-unresolved-name> 
-static bool ParseUnresolvedName(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
- 
-  ParseState copy = state->parse_state; 
-  if (Optional(ParseTwoCharToken(state, "gs")) && 
-      ParseBaseUnresolvedName(state)) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  if (ParseTwoCharToken(state, "sr") && ParseUnresolvedType(state) && 
-      ParseBaseUnresolvedName(state)) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  if (ParseTwoCharToken(state, "sr") && ParseOneCharToken(state, 'N') && 
-      ParseUnresolvedType(state) && 
-      OneOrMore(/* <unresolved-qualifier-level> ::= */ ParseSimpleId, state) && 
-      ParseOneCharToken(state, 'E') && ParseBaseUnresolvedName(state)) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  if (Optional(ParseTwoCharToken(state, "gs")) && 
-      ParseTwoCharToken(state, "sr") && 
-      OneOrMore(/* <unresolved-qualifier-level> ::= */ ParseSimpleId, state) && 
-      ParseOneCharToken(state, 'E') && ParseBaseUnresolvedName(state)) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  return false; 
-} 
- 
-// <expression> ::= <1-ary operator-name> <expression> 
-//              ::= <2-ary operator-name> <expression> <expression> 
-//              ::= <3-ary operator-name> <expression> <expression> <expression> 
-//              ::= cl <expression>+ E 
+      ParseOneCharToken(state, 'E')) {
+    return true;
+  }
+  state->parse_state = copy;
+  return false;
+}
+
+// <bare-function-type> ::= <(signature) type>+
+static bool ParseBareFunctionType(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  ParseState copy = state->parse_state;
+  DisableAppend(state);
+  if (OneOrMore(ParseType, state)) {
+    RestoreAppend(state, copy.append);
+    MaybeAppend(state, "()");
+    return true;
+  }
+  state->parse_state = copy;
+  return false;
+}
+
+// <class-enum-type> ::= <name>
+static bool ParseClassEnumType(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  return ParseName(state);
+}
+
+// <array-type> ::= A <(positive dimension) number> _ <(element) type>
+//              ::= A [<(dimension) expression>] _ <(element) type>
+static bool ParseArrayType(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  ParseState copy = state->parse_state;
+  if (ParseOneCharToken(state, 'A') && ParseNumber(state, nullptr) &&
+      ParseOneCharToken(state, '_') && ParseType(state)) {
+    return true;
+  }
+  state->parse_state = copy;
+
+  if (ParseOneCharToken(state, 'A') && Optional(ParseExpression(state)) &&
+      ParseOneCharToken(state, '_') && ParseType(state)) {
+    return true;
+  }
+  state->parse_state = copy;
+  return false;
+}
+
+// <pointer-to-member-type> ::= M <(class) type> <(member) type>
+static bool ParsePointerToMemberType(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  ParseState copy = state->parse_state;
+  if (ParseOneCharToken(state, 'M') && ParseType(state) && ParseType(state)) {
+    return true;
+  }
+  state->parse_state = copy;
+  return false;
+}
+
+// <template-param> ::= T_
+//                  ::= T <parameter-2 non-negative number> _
+static bool ParseTemplateParam(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  if (ParseTwoCharToken(state, "T_")) {
+    MaybeAppend(state, "?");  // We don't support template substitutions.
+    return true;
+  }
+
+  ParseState copy = state->parse_state;
+  if (ParseOneCharToken(state, 'T') && ParseNumber(state, nullptr) &&
+      ParseOneCharToken(state, '_')) {
+    MaybeAppend(state, "?");  // We don't support template substitutions.
+    return true;
+  }
+  state->parse_state = copy;
+  return false;
+}
+
+// <template-template-param> ::= <template-param>
+//                           ::= <substitution>
+static bool ParseTemplateTemplateParam(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  return (ParseTemplateParam(state) ||
+          // "std" on its own isn't a template.
+          ParseSubstitution(state, /*accept_std=*/false));
+}
+
+// <template-args> ::= I <template-arg>+ E
+static bool ParseTemplateArgs(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  ParseState copy = state->parse_state;
+  DisableAppend(state);
+  if (ParseOneCharToken(state, 'I') && OneOrMore(ParseTemplateArg, state) &&
+      ParseOneCharToken(state, 'E')) {
+    RestoreAppend(state, copy.append);
+    MaybeAppend(state, "<>");
+    return true;
+  }
+  state->parse_state = copy;
+  return false;
+}
+
+// <template-arg>  ::= <type>
+//                 ::= <expr-primary>
+//                 ::= J <template-arg>* E        # argument pack
+//                 ::= X <expression> E
+static bool ParseTemplateArg(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  ParseState copy = state->parse_state;
+  if (ParseOneCharToken(state, 'J') && ZeroOrMore(ParseTemplateArg, state) &&
+      ParseOneCharToken(state, 'E')) {
+    return true;
+  }
+  state->parse_state = copy;
+
+  // There can be significant overlap between the following leading to
+  // exponential backtracking:
+  //
+  //   <expr-primary> ::= L <type> <expr-cast-value> E
+  //                 e.g. L 2xxIvE 1                 E
+  //   <type>         ==> <local-source-name> <template-args>
+  //                 e.g. L 2xx               IvE
+  //
+  // This means parsing an entire <type> twice, and <type> can contain
+  // <template-arg>, so this can generate exponential backtracking.  There is
+  // only overlap when the remaining input starts with "L <source-name>", so
+  // parse all cases that can start this way jointly to share the common prefix.
+  //
+  // We have:
+  //
+  //   <template-arg> ::= <type>
+  //                  ::= <expr-primary>
+  //
+  // First, drop all the productions of <type> that must start with something
+  // other than 'L'.  All that's left is <class-enum-type>; inline it.
+  //
+  //   <type> ::= <nested-name> # starts with 'N'
+  //          ::= <unscoped-name>
+  //          ::= <unscoped-template-name> <template-args>
+  //          ::= <local-name> # starts with 'Z'
+  //
+  // Drop and inline again:
+  //
+  //   <type> ::= <unscoped-name>
+  //          ::= <unscoped-name> <template-args>
+  //          ::= <substitution> <template-args> # starts with 'S'
+  //
+  // Merge the first two, inline <unscoped-name>, drop last:
+  //
+  //   <type> ::= <unqualified-name> [<template-args>]
+  //          ::= St <unqualified-name> [<template-args>] # starts with 'S'
+  //
+  // Drop and inline:
+  //
+  //   <type> ::= <operator-name> [<template-args>] # starts with lowercase
+  //          ::= <ctor-dtor-name> [<template-args>] # starts with 'C' or 'D'
+  //          ::= <source-name> [<template-args>] # starts with digit
+  //          ::= <local-source-name> [<template-args>]
+  //          ::= <unnamed-type-name> [<template-args>] # starts with 'U'
+  //
+  // One more time:
+  //
+  //   <type> ::= L <source-name> [<template-args>]
+  //
+  // Likewise with <expr-primary>:
+  //
+  //   <expr-primary> ::= L <type> <expr-cast-value> E
+  //                  ::= LZ <encoding> E # cannot overlap; drop
+  //                  ::= L <mangled_name> E # cannot overlap; drop
+  //
+  // By similar reasoning as shown above, the only <type>s starting with
+  // <source-name> are "<source-name> [<template-args>]".  Inline this.
+  //
+  //   <expr-primary> ::= L <source-name> [<template-args>] <expr-cast-value> E
+  //
+  // Now inline both of these into <template-arg>:
+  //
+  //   <template-arg> ::= L <source-name> [<template-args>]
+  //                  ::= L <source-name> [<template-args>] <expr-cast-value> E
+  //
+  // Merge them and we're done:
+  //   <template-arg>
+  //     ::= L <source-name> [<template-args>] [<expr-cast-value> E]
+  if (ParseLocalSourceName(state) && Optional(ParseTemplateArgs(state))) {
+    copy = state->parse_state;
+    if (ParseExprCastValue(state) && ParseOneCharToken(state, 'E')) {
+      return true;
+    }
+    state->parse_state = copy;
+    return true;
+  }
+
+  // Now that the overlapping cases can't reach this code, we can safely call
+  // both of these.
+  if (ParseType(state) || ParseExprPrimary(state)) {
+    return true;
+  }
+  state->parse_state = copy;
+
+  if (ParseOneCharToken(state, 'X') && ParseExpression(state) &&
+      ParseOneCharToken(state, 'E')) {
+    return true;
+  }
+  state->parse_state = copy;
+  return false;
+}
+
+// <unresolved-type> ::= <template-param> [<template-args>]
+//                   ::= <decltype>
+//                   ::= <substitution>
+static inline bool ParseUnresolvedType(State *state) {
+  // No ComplexityGuard because we don't copy the state in this stack frame.
+  return (ParseTemplateParam(state) && Optional(ParseTemplateArgs(state))) ||
+         ParseDecltype(state) || ParseSubstitution(state, /*accept_std=*/false);
+}
+
+// <simple-id> ::= <source-name> [<template-args>]
+static inline bool ParseSimpleId(State *state) {
+  // No ComplexityGuard because we don't copy the state in this stack frame.
+
+  // Note: <simple-id> cannot be followed by a parameter pack; see comment in
+  // ParseUnresolvedType.
+  return ParseSourceName(state) && Optional(ParseTemplateArgs(state));
+}
+
+// <base-unresolved-name> ::= <source-name> [<template-args>]
+//                        ::= on <operator-name> [<template-args>]
+//                        ::= dn <destructor-name>
+static bool ParseBaseUnresolvedName(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+
+  if (ParseSimpleId(state)) {
+    return true;
+  }
+
+  ParseState copy = state->parse_state;
+  if (ParseTwoCharToken(state, "on") && ParseOperatorName(state, nullptr) &&
+      Optional(ParseTemplateArgs(state))) {
+    return true;
+  }
+  state->parse_state = copy;
+
+  if (ParseTwoCharToken(state, "dn") &&
+      (ParseUnresolvedType(state) || ParseSimpleId(state))) {
+    return true;
+  }
+  state->parse_state = copy;
+
+  return false;
+}
+
+// <unresolved-name> ::= [gs] <base-unresolved-name>
+//                   ::= sr <unresolved-type> <base-unresolved-name>
+//                   ::= srN <unresolved-type> <unresolved-qualifier-level>+ E
+//                         <base-unresolved-name>
+//                   ::= [gs] sr <unresolved-qualifier-level>+ E
+//                         <base-unresolved-name>
+static bool ParseUnresolvedName(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+
+  ParseState copy = state->parse_state;
+  if (Optional(ParseTwoCharToken(state, "gs")) &&
+      ParseBaseUnresolvedName(state)) {
+    return true;
+  }
+  state->parse_state = copy;
+
+  if (ParseTwoCharToken(state, "sr") && ParseUnresolvedType(state) &&
+      ParseBaseUnresolvedName(state)) {
+    return true;
+  }
+  state->parse_state = copy;
+
+  if (ParseTwoCharToken(state, "sr") && ParseOneCharToken(state, 'N') &&
+      ParseUnresolvedType(state) &&
+      OneOrMore(/* <unresolved-qualifier-level> ::= */ ParseSimpleId, state) &&
+      ParseOneCharToken(state, 'E') && ParseBaseUnresolvedName(state)) {
+    return true;
+  }
+  state->parse_state = copy;
+
+  if (Optional(ParseTwoCharToken(state, "gs")) &&
+      ParseTwoCharToken(state, "sr") &&
+      OneOrMore(/* <unresolved-qualifier-level> ::= */ ParseSimpleId, state) &&
+      ParseOneCharToken(state, 'E') && ParseBaseUnresolvedName(state)) {
+    return true;
+  }
+  state->parse_state = copy;
+
+  return false;
+}
+
+// <expression> ::= <1-ary operator-name> <expression>
+//              ::= <2-ary operator-name> <expression> <expression>
+//              ::= <3-ary operator-name> <expression> <expression> <expression>
+//              ::= cl <expression>+ E
 //              ::= cp <simple-id> <expression>* E # Clang-specific.
-//              ::= cv <type> <expression>      # type (expression) 
-//              ::= cv <type> _ <expression>* E # type (expr-list) 
-//              ::= st <type> 
-//              ::= <template-param> 
-//              ::= <function-param> 
-//              ::= <expr-primary> 
-//              ::= dt <expression> <unresolved-name> # expr.name 
-//              ::= pt <expression> <unresolved-name> # expr->name 
-//              ::= sp <expression>         # argument pack expansion 
-//              ::= sr <type> <unqualified-name> <template-args> 
-//              ::= sr <type> <unqualified-name> 
-// <function-param> ::= fp <(top-level) CV-qualifiers> _ 
-//                  ::= fp <(top-level) CV-qualifiers> <number> _ 
-//                  ::= fL <number> p <(top-level) CV-qualifiers> _ 
-//                  ::= fL <number> p <(top-level) CV-qualifiers> <number> _ 
-static bool ParseExpression(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  if (ParseTemplateParam(state) || ParseExprPrimary(state)) { 
-    return true; 
-  } 
- 
+//              ::= cv <type> <expression>      # type (expression)
+//              ::= cv <type> _ <expression>* E # type (expr-list)
+//              ::= st <type>
+//              ::= <template-param>
+//              ::= <function-param>
+//              ::= <expr-primary>
+//              ::= dt <expression> <unresolved-name> # expr.name
+//              ::= pt <expression> <unresolved-name> # expr->name
+//              ::= sp <expression>         # argument pack expansion
+//              ::= sr <type> <unqualified-name> <template-args>
+//              ::= sr <type> <unqualified-name>
+// <function-param> ::= fp <(top-level) CV-qualifiers> _
+//                  ::= fp <(top-level) CV-qualifiers> <number> _
+//                  ::= fL <number> p <(top-level) CV-qualifiers> _
+//                  ::= fL <number> p <(top-level) CV-qualifiers> <number> _
+static bool ParseExpression(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  if (ParseTemplateParam(state) || ParseExprPrimary(state)) {
+    return true;
+  }
+
   ParseState copy = state->parse_state;
 
-  // Object/function call expression. 
-  if (ParseTwoCharToken(state, "cl") && OneOrMore(ParseExpression, state) && 
-      ParseOneCharToken(state, 'E')) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
+  // Object/function call expression.
+  if (ParseTwoCharToken(state, "cl") && OneOrMore(ParseExpression, state) &&
+      ParseOneCharToken(state, 'E')) {
+    return true;
+  }
+  state->parse_state = copy;
+
   // Clang-specific "cp <simple-id> <expression>* E"
   //   https://clang.llvm.org/doxygen/ItaniumMangle_8cpp_source.html#l04338
   if (ParseTwoCharToken(state, "cp") && ParseSimpleId(state) &&
@@ -1657,303 +1657,303 @@ static bool ParseExpression(State *state) {
   }
   state->parse_state = copy;
 
-  // Function-param expression (level 0). 
-  if (ParseTwoCharToken(state, "fp") && Optional(ParseCVQualifiers(state)) && 
-      Optional(ParseNumber(state, nullptr)) && ParseOneCharToken(state, '_')) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  // Function-param expression (level 1+). 
-  if (ParseTwoCharToken(state, "fL") && Optional(ParseNumber(state, nullptr)) && 
-      ParseOneCharToken(state, 'p') && Optional(ParseCVQualifiers(state)) && 
-      Optional(ParseNumber(state, nullptr)) && ParseOneCharToken(state, '_')) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  // Parse the conversion expressions jointly to avoid re-parsing the <type> in 
-  // their common prefix.  Parsed as: 
-  // <expression> ::= cv <type> <conversion-args> 
-  // <conversion-args> ::= _ <expression>* E 
-  //                   ::= <expression> 
-  // 
-  // Also don't try ParseOperatorName after seeing "cv", since ParseOperatorName 
-  // also needs to accept "cv <type>" in other contexts. 
-  if (ParseTwoCharToken(state, "cv")) { 
-    if (ParseType(state)) { 
-      ParseState copy2 = state->parse_state; 
-      if (ParseOneCharToken(state, '_') && ZeroOrMore(ParseExpression, state) && 
-          ParseOneCharToken(state, 'E')) { 
-        return true; 
-      } 
-      state->parse_state = copy2; 
-      if (ParseExpression(state)) { 
-        return true; 
-      } 
-    } 
-  } else { 
-    // Parse unary, binary, and ternary operator expressions jointly, taking 
-    // care not to re-parse subexpressions repeatedly. Parse like: 
-    //   <expression> ::= <operator-name> <expression> 
-    //                    [<one-to-two-expressions>] 
-    //   <one-to-two-expressions> ::= <expression> [<expression>] 
-    int arity = -1; 
-    if (ParseOperatorName(state, &arity) && 
-        arity > 0 &&  // 0 arity => disabled. 
-        (arity < 3 || ParseExpression(state)) && 
-        (arity < 2 || ParseExpression(state)) && 
-        (arity < 1 || ParseExpression(state))) { 
-      return true; 
-    } 
-  } 
-  state->parse_state = copy; 
- 
-  // sizeof type 
-  if (ParseTwoCharToken(state, "st") && ParseType(state)) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  // Object and pointer member access expressions. 
-  if ((ParseTwoCharToken(state, "dt") || ParseTwoCharToken(state, "pt")) && 
-      ParseExpression(state) && ParseType(state)) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  // Pointer-to-member access expressions.  This parses the same as a binary 
-  // operator, but it's implemented separately because "ds" shouldn't be 
-  // accepted in other contexts that parse an operator name. 
-  if (ParseTwoCharToken(state, "ds") && ParseExpression(state) && 
-      ParseExpression(state)) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  // Parameter pack expansion 
-  if (ParseTwoCharToken(state, "sp") && ParseExpression(state)) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  return ParseUnresolvedName(state); 
-} 
- 
-// <expr-primary> ::= L <type> <(value) number> E 
-//                ::= L <type> <(value) float> E 
-//                ::= L <mangled-name> E 
-//                // A bug in g++'s C++ ABI version 2 (-fabi-version=2). 
-//                ::= LZ <encoding> E 
-// 
-// Warning, subtle: the "bug" LZ production above is ambiguous with the first 
-// production where <type> starts with <local-name>, which can lead to 
-// exponential backtracking in two scenarios: 
-// 
-// - When whatever follows the E in the <local-name> in the first production is 
-//   not a name, we backtrack the whole <encoding> and re-parse the whole thing. 
-// 
-// - When whatever follows the <local-name> in the first production is not a 
-//   number and this <expr-primary> may be followed by a name, we backtrack the 
-//   <name> and re-parse it. 
-// 
-// Moreover this ambiguity isn't always resolved -- for example, the following 
-// has two different parses: 
-// 
-//   _ZaaILZ4aoeuE1x1EvE 
-//   => operator&&<aoeu, x, E, void> 
-//   => operator&&<(aoeu::x)(1), void> 
-// 
-// To resolve this, we just do what GCC's demangler does, and refuse to parse 
-// casts to <local-name> types. 
-static bool ParseExprPrimary(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  ParseState copy = state->parse_state; 
- 
-  // The "LZ" special case: if we see LZ, we commit to accept "LZ <encoding> E" 
-  // or fail, no backtracking. 
-  if (ParseTwoCharToken(state, "LZ")) { 
-    if (ParseEncoding(state) && ParseOneCharToken(state, 'E')) { 
-      return true; 
-    } 
- 
-    state->parse_state = copy; 
-    return false; 
-  } 
- 
-  // The merged cast production. 
-  if (ParseOneCharToken(state, 'L') && ParseType(state) && 
-      ParseExprCastValue(state)) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  if (ParseOneCharToken(state, 'L') && ParseMangledName(state) && 
-      ParseOneCharToken(state, 'E')) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  return false; 
-} 
- 
-// <number> or <float>, followed by 'E', as described above ParseExprPrimary. 
-static bool ParseExprCastValue(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  // We have to be able to backtrack after accepting a number because we could 
-  // have e.g. "7fffE", which will accept "7" as a number but then fail to find 
-  // the 'E'. 
-  ParseState copy = state->parse_state; 
-  if (ParseNumber(state, nullptr) && ParseOneCharToken(state, 'E')) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  if (ParseFloatNumber(state) && ParseOneCharToken(state, 'E')) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  return false; 
-} 
- 
-// <local-name> ::= Z <(function) encoding> E <(entity) name> [<discriminator>] 
-//              ::= Z <(function) encoding> E s [<discriminator>] 
-// 
-// Parsing a common prefix of these two productions together avoids an 
-// exponential blowup of backtracking.  Parse like: 
-//   <local-name> := Z <encoding> E <local-name-suffix> 
-//   <local-name-suffix> ::= s [<discriminator>] 
-//                       ::= <name> [<discriminator>] 
- 
-static bool ParseLocalNameSuffix(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
- 
-  if (MaybeAppend(state, "::") && ParseName(state) && 
-      Optional(ParseDiscriminator(state))) { 
-    return true; 
-  } 
- 
-  // Since we're not going to overwrite the above "::" by re-parsing the 
-  // <encoding> (whose trailing '\0' byte was in the byte now holding the 
-  // first ':'), we have to rollback the "::" if the <name> parse failed. 
-  if (state->parse_state.append) { 
-    state->out[state->parse_state.out_cur_idx - 2] = '\0'; 
-  } 
- 
-  return ParseOneCharToken(state, 's') && Optional(ParseDiscriminator(state)); 
-} 
- 
-static bool ParseLocalName(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  ParseState copy = state->parse_state; 
-  if (ParseOneCharToken(state, 'Z') && ParseEncoding(state) && 
-      ParseOneCharToken(state, 'E') && ParseLocalNameSuffix(state)) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
-  return false; 
-} 
- 
-// <discriminator> := _ <(non-negative) number> 
-static bool ParseDiscriminator(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  ParseState copy = state->parse_state; 
-  if (ParseOneCharToken(state, '_') && ParseNumber(state, nullptr)) { 
-    return true; 
-  } 
-  state->parse_state = copy; 
-  return false; 
-} 
- 
-// <substitution> ::= S_ 
-//                ::= S <seq-id> _ 
-//                ::= St, etc. 
-// 
-// "St" is special in that it's not valid as a standalone name, and it *is* 
-// allowed to precede a name without being wrapped in "N...E".  This means that 
-// if we accept it on its own, we can accept "St1a" and try to parse 
-// template-args, then fail and backtrack, accept "St" on its own, then "1a" as 
-// an unqualified name and re-parse the same template-args.  To block this 
-// exponential backtracking, we disable it with 'accept_std=false' in 
-// problematic contexts. 
-static bool ParseSubstitution(State *state, bool accept_std) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  if (ParseTwoCharToken(state, "S_")) { 
-    MaybeAppend(state, "?");  // We don't support substitutions. 
-    return true; 
-  } 
- 
-  ParseState copy = state->parse_state; 
-  if (ParseOneCharToken(state, 'S') && ParseSeqId(state) && 
-      ParseOneCharToken(state, '_')) { 
-    MaybeAppend(state, "?");  // We don't support substitutions. 
-    return true; 
-  } 
-  state->parse_state = copy; 
- 
-  // Expand abbreviations like "St" => "std". 
-  if (ParseOneCharToken(state, 'S')) { 
-    const AbbrevPair *p; 
-    for (p = kSubstitutionList; p->abbrev != nullptr; ++p) { 
-      if (RemainingInput(state)[0] == p->abbrev[1] && 
-          (accept_std || p->abbrev[1] != 't')) { 
-        MaybeAppend(state, "std"); 
-        if (p->real_name[0] != '\0') { 
-          MaybeAppend(state, "::"); 
-          MaybeAppend(state, p->real_name); 
-        } 
-        ++state->parse_state.mangled_idx; 
-        return true; 
-      } 
-    } 
-  } 
-  state->parse_state = copy; 
-  return false; 
-} 
- 
-// Parse <mangled-name>, optionally followed by either a function-clone suffix 
-// or version suffix.  Returns true only if all of "mangled_cur" was consumed. 
-static bool ParseTopLevelMangledName(State *state) { 
-  ComplexityGuard guard(state); 
-  if (guard.IsTooComplex()) return false; 
-  if (ParseMangledName(state)) { 
-    if (RemainingInput(state)[0] != '\0') { 
-      // Drop trailing function clone suffix, if any. 
-      if (IsFunctionCloneSuffix(RemainingInput(state))) { 
-        return true; 
-      } 
-      // Append trailing version suffix if any. 
-      // ex. _Z3foo@@GLIBCXX_3.4 
-      if (RemainingInput(state)[0] == '@') { 
-        MaybeAppend(state, RemainingInput(state)); 
-        return true; 
-      } 
-      return false;  // Unconsumed suffix. 
-    } 
-    return true; 
-  } 
-  return false; 
-} 
- 
-static bool Overflowed(const State *state) { 
-  return state->parse_state.out_cur_idx >= state->out_end_idx; 
-} 
- 
-// The demangler entry point. 
-bool Demangle(const char *mangled, char *out, int out_size) { 
-  State state; 
-  InitState(&state, mangled, out, out_size); 
+  // Function-param expression (level 0).
+  if (ParseTwoCharToken(state, "fp") && Optional(ParseCVQualifiers(state)) &&
+      Optional(ParseNumber(state, nullptr)) && ParseOneCharToken(state, '_')) {
+    return true;
+  }
+  state->parse_state = copy;
+
+  // Function-param expression (level 1+).
+  if (ParseTwoCharToken(state, "fL") && Optional(ParseNumber(state, nullptr)) &&
+      ParseOneCharToken(state, 'p') && Optional(ParseCVQualifiers(state)) &&
+      Optional(ParseNumber(state, nullptr)) && ParseOneCharToken(state, '_')) {
+    return true;
+  }
+  state->parse_state = copy;
+
+  // Parse the conversion expressions jointly to avoid re-parsing the <type> in
+  // their common prefix.  Parsed as:
+  // <expression> ::= cv <type> <conversion-args>
+  // <conversion-args> ::= _ <expression>* E
+  //                   ::= <expression>
+  //
+  // Also don't try ParseOperatorName after seeing "cv", since ParseOperatorName
+  // also needs to accept "cv <type>" in other contexts.
+  if (ParseTwoCharToken(state, "cv")) {
+    if (ParseType(state)) {
+      ParseState copy2 = state->parse_state;
+      if (ParseOneCharToken(state, '_') && ZeroOrMore(ParseExpression, state) &&
+          ParseOneCharToken(state, 'E')) {
+        return true;
+      }
+      state->parse_state = copy2;
+      if (ParseExpression(state)) {
+        return true;
+      }
+    }
+  } else {
+    // Parse unary, binary, and ternary operator expressions jointly, taking
+    // care not to re-parse subexpressions repeatedly. Parse like:
+    //   <expression> ::= <operator-name> <expression>
+    //                    [<one-to-two-expressions>]
+    //   <one-to-two-expressions> ::= <expression> [<expression>]
+    int arity = -1;
+    if (ParseOperatorName(state, &arity) &&
+        arity > 0 &&  // 0 arity => disabled.
+        (arity < 3 || ParseExpression(state)) &&
+        (arity < 2 || ParseExpression(state)) &&
+        (arity < 1 || ParseExpression(state))) {
+      return true;
+    }
+  }
+  state->parse_state = copy;
+
+  // sizeof type
+  if (ParseTwoCharToken(state, "st") && ParseType(state)) {
+    return true;
+  }
+  state->parse_state = copy;
+
+  // Object and pointer member access expressions.
+  if ((ParseTwoCharToken(state, "dt") || ParseTwoCharToken(state, "pt")) &&
+      ParseExpression(state) && ParseType(state)) {
+    return true;
+  }
+  state->parse_state = copy;
+
+  // Pointer-to-member access expressions.  This parses the same as a binary
+  // operator, but it's implemented separately because "ds" shouldn't be
+  // accepted in other contexts that parse an operator name.
+  if (ParseTwoCharToken(state, "ds") && ParseExpression(state) &&
+      ParseExpression(state)) {
+    return true;
+  }
+  state->parse_state = copy;
+
+  // Parameter pack expansion
+  if (ParseTwoCharToken(state, "sp") && ParseExpression(state)) {
+    return true;
+  }
+  state->parse_state = copy;
+
+  return ParseUnresolvedName(state);
+}
+
+// <expr-primary> ::= L <type> <(value) number> E
+//                ::= L <type> <(value) float> E
+//                ::= L <mangled-name> E
+//                // A bug in g++'s C++ ABI version 2 (-fabi-version=2).
+//                ::= LZ <encoding> E
+//
+// Warning, subtle: the "bug" LZ production above is ambiguous with the first
+// production where <type> starts with <local-name>, which can lead to
+// exponential backtracking in two scenarios:
+//
+// - When whatever follows the E in the <local-name> in the first production is
+//   not a name, we backtrack the whole <encoding> and re-parse the whole thing.
+//
+// - When whatever follows the <local-name> in the first production is not a
+//   number and this <expr-primary> may be followed by a name, we backtrack the
+//   <name> and re-parse it.
+//
+// Moreover this ambiguity isn't always resolved -- for example, the following
+// has two different parses:
+//
+//   _ZaaILZ4aoeuE1x1EvE
+//   => operator&&<aoeu, x, E, void>
+//   => operator&&<(aoeu::x)(1), void>
+//
+// To resolve this, we just do what GCC's demangler does, and refuse to parse
+// casts to <local-name> types.
+static bool ParseExprPrimary(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  ParseState copy = state->parse_state;
+
+  // The "LZ" special case: if we see LZ, we commit to accept "LZ <encoding> E"
+  // or fail, no backtracking.
+  if (ParseTwoCharToken(state, "LZ")) {
+    if (ParseEncoding(state) && ParseOneCharToken(state, 'E')) {
+      return true;
+    }
+
+    state->parse_state = copy;
+    return false;
+  }
+
+  // The merged cast production.
+  if (ParseOneCharToken(state, 'L') && ParseType(state) &&
+      ParseExprCastValue(state)) {
+    return true;
+  }
+  state->parse_state = copy;
+
+  if (ParseOneCharToken(state, 'L') && ParseMangledName(state) &&
+      ParseOneCharToken(state, 'E')) {
+    return true;
+  }
+  state->parse_state = copy;
+
+  return false;
+}
+
+// <number> or <float>, followed by 'E', as described above ParseExprPrimary.
+static bool ParseExprCastValue(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  // We have to be able to backtrack after accepting a number because we could
+  // have e.g. "7fffE", which will accept "7" as a number but then fail to find
+  // the 'E'.
+  ParseState copy = state->parse_state;
+  if (ParseNumber(state, nullptr) && ParseOneCharToken(state, 'E')) {
+    return true;
+  }
+  state->parse_state = copy;
+
+  if (ParseFloatNumber(state) && ParseOneCharToken(state, 'E')) {
+    return true;
+  }
+  state->parse_state = copy;
+
+  return false;
+}
+
+// <local-name> ::= Z <(function) encoding> E <(entity) name> [<discriminator>]
+//              ::= Z <(function) encoding> E s [<discriminator>]
+//
+// Parsing a common prefix of these two productions together avoids an
+// exponential blowup of backtracking.  Parse like:
+//   <local-name> := Z <encoding> E <local-name-suffix>
+//   <local-name-suffix> ::= s [<discriminator>]
+//                       ::= <name> [<discriminator>]
+
+static bool ParseLocalNameSuffix(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+
+  if (MaybeAppend(state, "::") && ParseName(state) &&
+      Optional(ParseDiscriminator(state))) {
+    return true;
+  }
+
+  // Since we're not going to overwrite the above "::" by re-parsing the
+  // <encoding> (whose trailing '\0' byte was in the byte now holding the
+  // first ':'), we have to rollback the "::" if the <name> parse failed.
+  if (state->parse_state.append) {
+    state->out[state->parse_state.out_cur_idx - 2] = '\0';
+  }
+
+  return ParseOneCharToken(state, 's') && Optional(ParseDiscriminator(state));
+}
+
+static bool ParseLocalName(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  ParseState copy = state->parse_state;
+  if (ParseOneCharToken(state, 'Z') && ParseEncoding(state) &&
+      ParseOneCharToken(state, 'E') && ParseLocalNameSuffix(state)) {
+    return true;
+  }
+  state->parse_state = copy;
+  return false;
+}
+
+// <discriminator> := _ <(non-negative) number>
+static bool ParseDiscriminator(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  ParseState copy = state->parse_state;
+  if (ParseOneCharToken(state, '_') && ParseNumber(state, nullptr)) {
+    return true;
+  }
+  state->parse_state = copy;
+  return false;
+}
+
+// <substitution> ::= S_
+//                ::= S <seq-id> _
+//                ::= St, etc.
+//
+// "St" is special in that it's not valid as a standalone name, and it *is*
+// allowed to precede a name without being wrapped in "N...E".  This means that
+// if we accept it on its own, we can accept "St1a" and try to parse
+// template-args, then fail and backtrack, accept "St" on its own, then "1a" as
+// an unqualified name and re-parse the same template-args.  To block this
+// exponential backtracking, we disable it with 'accept_std=false' in
+// problematic contexts.
+static bool ParseSubstitution(State *state, bool accept_std) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  if (ParseTwoCharToken(state, "S_")) {
+    MaybeAppend(state, "?");  // We don't support substitutions.
+    return true;
+  }
+
+  ParseState copy = state->parse_state;
+  if (ParseOneCharToken(state, 'S') && ParseSeqId(state) &&
+      ParseOneCharToken(state, '_')) {
+    MaybeAppend(state, "?");  // We don't support substitutions.
+    return true;
+  }
+  state->parse_state = copy;
+
+  // Expand abbreviations like "St" => "std".
+  if (ParseOneCharToken(state, 'S')) {
+    const AbbrevPair *p;
+    for (p = kSubstitutionList; p->abbrev != nullptr; ++p) {
+      if (RemainingInput(state)[0] == p->abbrev[1] &&
+          (accept_std || p->abbrev[1] != 't')) {
+        MaybeAppend(state, "std");
+        if (p->real_name[0] != '\0') {
+          MaybeAppend(state, "::");
+          MaybeAppend(state, p->real_name);
+        }
+        ++state->parse_state.mangled_idx;
+        return true;
+      }
+    }
+  }
+  state->parse_state = copy;
+  return false;
+}
+
+// Parse <mangled-name>, optionally followed by either a function-clone suffix
+// or version suffix.  Returns true only if all of "mangled_cur" was consumed.
+static bool ParseTopLevelMangledName(State *state) {
+  ComplexityGuard guard(state);
+  if (guard.IsTooComplex()) return false;
+  if (ParseMangledName(state)) {
+    if (RemainingInput(state)[0] != '\0') {
+      // Drop trailing function clone suffix, if any.
+      if (IsFunctionCloneSuffix(RemainingInput(state))) {
+        return true;
+      }
+      // Append trailing version suffix if any.
+      // ex. _Z3foo@@GLIBCXX_3.4
+      if (RemainingInput(state)[0] == '@') {
+        MaybeAppend(state, RemainingInput(state));
+        return true;
+      }
+      return false;  // Unconsumed suffix.
+    }
+    return true;
+  }
+  return false;
+}
+
+static bool Overflowed(const State *state) {
+  return state->parse_state.out_cur_idx >= state->out_end_idx;
+}
+
+// The demangler entry point.
+bool Demangle(const char *mangled, char *out, int out_size) {
+  State state;
+  InitState(&state, mangled, out, out_size);
   return ParseTopLevelMangledName(&state) && !Overflowed(&state) &&
          state.parse_state.out_cur_idx > 0;
-} 
- 
-}  // namespace debugging_internal 
+}
+
+}  // namespace debugging_internal
 ABSL_NAMESPACE_END
 }  // namespace y_absl
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/demangle.h b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/demangle.h
index 75bd311b8d..a9b42edb45 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/demangle.h
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/demangle.h
@@ -1,71 +1,71 @@
-// Copyright 2018 The Abseil Authors. 
-// 
-// Licensed under the Apache License, Version 2.0 (the "License"); 
-// you may not use this file except in compliance with the License. 
-// You may obtain a copy of the License at 
-// 
-//      https://www.apache.org/licenses/LICENSE-2.0 
-// 
-// Unless required by applicable law or agreed to in writing, software 
-// distributed under the License is distributed on an "AS IS" BASIS, 
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
-// See the License for the specific language governing permissions and 
-// limitations under the License. 
- 
-// An async-signal-safe and thread-safe demangler for Itanium C++ ABI 
-// (aka G++ V3 ABI). 
-// 
-// The demangler is implemented to be used in async signal handlers to 
-// symbolize stack traces.  We cannot use libstdc++'s 
-// abi::__cxa_demangle() in such signal handlers since it's not async 
-// signal safe (it uses malloc() internally). 
-// 
-// Note that this demangler doesn't support full demangling.  More 
-// specifically, it doesn't print types of function parameters and 
-// types of template arguments.  It just skips them.  However, it's 
-// still very useful to extract basic information such as class, 
-// function, constructor, destructor, and operator names. 
-// 
-// See the implementation note in demangle.cc if you are interested. 
-// 
-// Example: 
-// 
-// | Mangled Name  | The Demangler | abi::__cxa_demangle() 
-// |---------------|---------------|----------------------- 
-// | _Z1fv         | f()           | f() 
-// | _Z1fi         | f()           | f(int) 
-// | _Z3foo3bar    | foo()         | foo(bar) 
-// | _Z1fIiEvi     | f<>()         | void f<int>(int) 
-// | _ZN1N1fE      | N::f          | N::f 
-// | _ZN3Foo3BarEv | Foo::Bar()    | Foo::Bar() 
-// | _Zrm1XS_"     | operator%()   | operator%(X, X) 
-// | _ZN3FooC1Ev   | Foo::Foo()    | Foo::Foo() 
-// | _Z1fSs        | f()           | f(std::basic_string<char, 
-// |               |               |   std::char_traits<char>, 
-// |               |               |   std::allocator<char> >) 
-// 
-// See the unit test for more examples. 
-// 
-// Note: we might want to write demanglers for ABIs other than Itanium 
-// C++ ABI in the future. 
-// 
- 
-#ifndef ABSL_DEBUGGING_INTERNAL_DEMANGLE_H_ 
-#define ABSL_DEBUGGING_INTERNAL_DEMANGLE_H_ 
- 
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// An async-signal-safe and thread-safe demangler for Itanium C++ ABI
+// (aka G++ V3 ABI).
+//
+// The demangler is implemented to be used in async signal handlers to
+// symbolize stack traces.  We cannot use libstdc++'s
+// abi::__cxa_demangle() in such signal handlers since it's not async
+// signal safe (it uses malloc() internally).
+//
+// Note that this demangler doesn't support full demangling.  More
+// specifically, it doesn't print types of function parameters and
+// types of template arguments.  It just skips them.  However, it's
+// still very useful to extract basic information such as class,
+// function, constructor, destructor, and operator names.
+//
+// See the implementation note in demangle.cc if you are interested.
+//
+// Example:
+//
+// | Mangled Name  | The Demangler | abi::__cxa_demangle()
+// |---------------|---------------|-----------------------
+// | _Z1fv         | f()           | f()
+// | _Z1fi         | f()           | f(int)
+// | _Z3foo3bar    | foo()         | foo(bar)
+// | _Z1fIiEvi     | f<>()         | void f<int>(int)
+// | _ZN1N1fE      | N::f          | N::f
+// | _ZN3Foo3BarEv | Foo::Bar()    | Foo::Bar()
+// | _Zrm1XS_"     | operator%()   | operator%(X, X)
+// | _ZN3FooC1Ev   | Foo::Foo()    | Foo::Foo()
+// | _Z1fSs        | f()           | f(std::basic_string<char,
+// |               |               |   std::char_traits<char>,
+// |               |               |   std::allocator<char> >)
+//
+// See the unit test for more examples.
+//
+// Note: we might want to write demanglers for ABIs other than Itanium
+// C++ ABI in the future.
+//
+
+#ifndef ABSL_DEBUGGING_INTERNAL_DEMANGLE_H_
+#define ABSL_DEBUGGING_INTERNAL_DEMANGLE_H_
+
 #include "y_absl/base/config.h"
 
 namespace y_absl {
 ABSL_NAMESPACE_BEGIN
-namespace debugging_internal { 
- 
-// Demangle `mangled`.  On success, return true and write the 
-// demangled symbol name to `out`.  Otherwise, return false. 
-// `out` is modified even if demangling is unsuccessful. 
-bool Demangle(const char *mangled, char *out, int out_size); 
- 
-}  // namespace debugging_internal 
+namespace debugging_internal {
+
+// Demangle `mangled`.  On success, return true and write the
+// demangled symbol name to `out`.  Otherwise, return false.
+// `out` is modified even if demangling is unsuccessful.
+bool Demangle(const char *mangled, char *out, int out_size);
+
+}  // namespace debugging_internal
 ABSL_NAMESPACE_END
 }  // namespace y_absl
- 
-#endif  // ABSL_DEBUGGING_INTERNAL_DEMANGLE_H_ 
+
+#endif  // ABSL_DEBUGGING_INTERNAL_DEMANGLE_H_
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/elf_mem_image.cc b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/elf_mem_image.cc
index 2ccc9381b7..ba4bbc3855 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/elf_mem_image.cc
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/elf_mem_image.cc
@@ -1,383 +1,383 @@
-// Copyright 2017 The Abseil Authors. 
-// 
-// Licensed under the Apache License, Version 2.0 (the "License"); 
-// you may not use this file except in compliance with the License. 
-// You may obtain a copy of the License at 
-// 
-//      https://www.apache.org/licenses/LICENSE-2.0 
-// 
-// Unless required by applicable law or agreed to in writing, software 
-// distributed under the License is distributed on an "AS IS" BASIS, 
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
-// See the License for the specific language governing permissions and 
-// limitations under the License. 
- 
-// Allow dynamic symbol lookup in an in-memory Elf image. 
-// 
- 
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Allow dynamic symbol lookup in an in-memory Elf image.
+//
+
 #include "y_absl/debugging/internal/elf_mem_image.h"
- 
-#ifdef ABSL_HAVE_ELF_MEM_IMAGE  // defined in elf_mem_image.h 
- 
-#include <string.h> 
-#include <cassert> 
-#include <cstddef> 
+
+#ifdef ABSL_HAVE_ELF_MEM_IMAGE  // defined in elf_mem_image.h
+
+#include <string.h>
+#include <cassert>
+#include <cstddef>
 #include "y_absl/base/config.h"
 #include "y_absl/base/internal/raw_logging.h"
- 
-// From binutils/include/elf/common.h (this doesn't appear to be documented 
-// anywhere else). 
-// 
-//   /* This flag appears in a Versym structure.  It means that the symbol 
-//      is hidden, and is only visible with an explicit version number. 
-//      This is a GNU extension.  */ 
-//   #define VERSYM_HIDDEN           0x8000 
-// 
-//   /* This is the mask for the rest of the Versym information.  */ 
-//   #define VERSYM_VERSION          0x7fff 
- 
-#define VERSYM_VERSION 0x7fff 
- 
+
+// From binutils/include/elf/common.h (this doesn't appear to be documented
+// anywhere else).
+//
+//   /* This flag appears in a Versym structure.  It means that the symbol
+//      is hidden, and is only visible with an explicit version number.
+//      This is a GNU extension.  */
+//   #define VERSYM_HIDDEN           0x8000
+//
+//   /* This is the mask for the rest of the Versym information.  */
+//   #define VERSYM_VERSION          0x7fff
+
+#define VERSYM_VERSION 0x7fff
+
 namespace y_absl {
 ABSL_NAMESPACE_BEGIN
-namespace debugging_internal { 
- 
-namespace { 
- 
+namespace debugging_internal {
+
+namespace {
+
 #if __SIZEOF_POINTER__ == 4
-const int kElfClass = ELFCLASS32; 
-int ElfBind(const ElfW(Sym) *symbol) { return ELF32_ST_BIND(symbol->st_info); } 
-int ElfType(const ElfW(Sym) *symbol) { return ELF32_ST_TYPE(symbol->st_info); } 
+const int kElfClass = ELFCLASS32;
+int ElfBind(const ElfW(Sym) *symbol) { return ELF32_ST_BIND(symbol->st_info); }
+int ElfType(const ElfW(Sym) *symbol) { return ELF32_ST_TYPE(symbol->st_info); }
 #elif __SIZEOF_POINTER__ == 8
-const int kElfClass = ELFCLASS64; 
-int ElfBind(const ElfW(Sym) *symbol) { return ELF64_ST_BIND(symbol->st_info); } 
-int ElfType(const ElfW(Sym) *symbol) { return ELF64_ST_TYPE(symbol->st_info); } 
-#else 
-const int kElfClass = -1; 
-int ElfBind(const ElfW(Sym) *) { 
-  ABSL_RAW_LOG(FATAL, "Unexpected word size"); 
-  return 0; 
-} 
-int ElfType(const ElfW(Sym) *) { 
-  ABSL_RAW_LOG(FATAL, "Unexpected word size"); 
-  return 0; 
-} 
-#endif 
- 
-// Extract an element from one of the ELF tables, cast it to desired type. 
-// This is just a simple arithmetic and a glorified cast. 
-// Callers are responsible for bounds checking. 
-template <typename T> 
-const T *GetTableElement(const ElfW(Ehdr) * ehdr, ElfW(Off) table_offset, 
-                         ElfW(Word) element_size, size_t index) { 
-  return reinterpret_cast<const T*>(reinterpret_cast<const char *>(ehdr) 
-                                    + table_offset 
-                                    + index * element_size); 
-} 
- 
-}  // namespace 
- 
-// The value of this variable doesn't matter; it's used only for its 
-// unique address. 
-const int ElfMemImage::kInvalidBaseSentinel = 0; 
- 
-ElfMemImage::ElfMemImage(const void *base) { 
-  ABSL_RAW_CHECK(base != kInvalidBase, "bad pointer"); 
-  Init(base); 
-} 
- 
-int ElfMemImage::GetNumSymbols() const { 
-  if (!hash_) { 
-    return 0; 
-  } 
-  // See http://www.caldera.com/developers/gabi/latest/ch5.dynamic.html#hash 
-  return hash_[1]; 
-} 
- 
-const ElfW(Sym) *ElfMemImage::GetDynsym(int index) const { 
-  ABSL_RAW_CHECK(index < GetNumSymbols(), "index out of range"); 
-  return dynsym_ + index; 
-} 
- 
-const ElfW(Versym) *ElfMemImage::GetVersym(int index) const { 
-  ABSL_RAW_CHECK(index < GetNumSymbols(), "index out of range"); 
-  return versym_ + index; 
-} 
- 
-const ElfW(Phdr) *ElfMemImage::GetPhdr(int index) const { 
-  ABSL_RAW_CHECK(index < ehdr_->e_phnum, "index out of range"); 
-  return GetTableElement<ElfW(Phdr)>(ehdr_, 
-                                     ehdr_->e_phoff, 
-                                     ehdr_->e_phentsize, 
-                                     index); 
-} 
- 
-const char *ElfMemImage::GetDynstr(ElfW(Word) offset) const { 
-  ABSL_RAW_CHECK(offset < strsize_, "offset out of range"); 
-  return dynstr_ + offset; 
-} 
- 
-const void *ElfMemImage::GetSymAddr(const ElfW(Sym) *sym) const { 
-  if (sym->st_shndx == SHN_UNDEF || sym->st_shndx >= SHN_LORESERVE) { 
-    // Symbol corresponds to "special" (e.g. SHN_ABS) section. 
-    return reinterpret_cast<const void *>(sym->st_value); 
-  } 
-  ABSL_RAW_CHECK(link_base_ < sym->st_value, "symbol out of range"); 
-  return GetTableElement<char>(ehdr_, 0, 1, sym->st_value - link_base_); 
-} 
- 
-const ElfW(Verdef) *ElfMemImage::GetVerdef(int index) const { 
-  ABSL_RAW_CHECK(0 <= index && static_cast<size_t>(index) <= verdefnum_, 
-                 "index out of range"); 
-  const ElfW(Verdef) *version_definition = verdef_; 
-  while (version_definition->vd_ndx < index && version_definition->vd_next) { 
-    const char *const version_definition_as_char = 
-        reinterpret_cast<const char *>(version_definition); 
-    version_definition = 
-        reinterpret_cast<const ElfW(Verdef) *>(version_definition_as_char + 
-                                               version_definition->vd_next); 
-  } 
-  return version_definition->vd_ndx == index ? version_definition : nullptr; 
-} 
- 
-const ElfW(Verdaux) *ElfMemImage::GetVerdefAux( 
-    const ElfW(Verdef) *verdef) const { 
-  return reinterpret_cast<const ElfW(Verdaux) *>(verdef+1); 
-} 
- 
-const char *ElfMemImage::GetVerstr(ElfW(Word) offset) const { 
-  ABSL_RAW_CHECK(offset < strsize_, "offset out of range"); 
-  return dynstr_ + offset; 
-} 
- 
-void ElfMemImage::Init(const void *base) { 
-  ehdr_      = nullptr; 
-  dynsym_    = nullptr; 
-  dynstr_    = nullptr; 
-  versym_    = nullptr; 
-  verdef_    = nullptr; 
-  hash_      = nullptr; 
-  strsize_   = 0; 
-  verdefnum_ = 0; 
-  link_base_ = ~0L;  // Sentinel: PT_LOAD .p_vaddr can't possibly be this. 
-  if (!base) { 
-    return; 
-  } 
-  const char *const base_as_char = reinterpret_cast<const char *>(base); 
-  if (base_as_char[EI_MAG0] != ELFMAG0 || base_as_char[EI_MAG1] != ELFMAG1 || 
-      base_as_char[EI_MAG2] != ELFMAG2 || base_as_char[EI_MAG3] != ELFMAG3) { 
-    assert(false); 
-    return; 
-  } 
-  int elf_class = base_as_char[EI_CLASS]; 
-  if (elf_class != kElfClass) { 
-    assert(false); 
-    return; 
-  } 
-  switch (base_as_char[EI_DATA]) { 
-    case ELFDATA2LSB: { 
+const int kElfClass = ELFCLASS64;
+int ElfBind(const ElfW(Sym) *symbol) { return ELF64_ST_BIND(symbol->st_info); }
+int ElfType(const ElfW(Sym) *symbol) { return ELF64_ST_TYPE(symbol->st_info); }
+#else
+const int kElfClass = -1;
+int ElfBind(const ElfW(Sym) *) {
+  ABSL_RAW_LOG(FATAL, "Unexpected word size");
+  return 0;
+}
+int ElfType(const ElfW(Sym) *) {
+  ABSL_RAW_LOG(FATAL, "Unexpected word size");
+  return 0;
+}
+#endif
+
+// Extract an element from one of the ELF tables, cast it to desired type.
+// This is just a simple arithmetic and a glorified cast.
+// Callers are responsible for bounds checking.
+template <typename T>
+const T *GetTableElement(const ElfW(Ehdr) * ehdr, ElfW(Off) table_offset,
+                         ElfW(Word) element_size, size_t index) {
+  return reinterpret_cast<const T*>(reinterpret_cast<const char *>(ehdr)
+                                    + table_offset
+                                    + index * element_size);
+}
+
+}  // namespace
+
+// The value of this variable doesn't matter; it's used only for its
+// unique address.
+const int ElfMemImage::kInvalidBaseSentinel = 0;
+
+ElfMemImage::ElfMemImage(const void *base) {
+  ABSL_RAW_CHECK(base != kInvalidBase, "bad pointer");
+  Init(base);
+}
+
+int ElfMemImage::GetNumSymbols() const {
+  if (!hash_) {
+    return 0;
+  }
+  // See http://www.caldera.com/developers/gabi/latest/ch5.dynamic.html#hash
+  return hash_[1];
+}
+
+const ElfW(Sym) *ElfMemImage::GetDynsym(int index) const {
+  ABSL_RAW_CHECK(index < GetNumSymbols(), "index out of range");
+  return dynsym_ + index;
+}
+
+const ElfW(Versym) *ElfMemImage::GetVersym(int index) const {
+  ABSL_RAW_CHECK(index < GetNumSymbols(), "index out of range");
+  return versym_ + index;
+}
+
+const ElfW(Phdr) *ElfMemImage::GetPhdr(int index) const {
+  ABSL_RAW_CHECK(index < ehdr_->e_phnum, "index out of range");
+  return GetTableElement<ElfW(Phdr)>(ehdr_,
+                                     ehdr_->e_phoff,
+                                     ehdr_->e_phentsize,
+                                     index);
+}
+
+const char *ElfMemImage::GetDynstr(ElfW(Word) offset) const {
+  ABSL_RAW_CHECK(offset < strsize_, "offset out of range");
+  return dynstr_ + offset;
+}
+
+const void *ElfMemImage::GetSymAddr(const ElfW(Sym) *sym) const {
+  if (sym->st_shndx == SHN_UNDEF || sym->st_shndx >= SHN_LORESERVE) {
+    // Symbol corresponds to "special" (e.g. SHN_ABS) section.
+    return reinterpret_cast<const void *>(sym->st_value);
+  }
+  ABSL_RAW_CHECK(link_base_ < sym->st_value, "symbol out of range");
+  return GetTableElement<char>(ehdr_, 0, 1, sym->st_value - link_base_);
+}
+
+const ElfW(Verdef) *ElfMemImage::GetVerdef(int index) const {
+  ABSL_RAW_CHECK(0 <= index && static_cast<size_t>(index) <= verdefnum_,
+                 "index out of range");
+  const ElfW(Verdef) *version_definition = verdef_;
+  while (version_definition->vd_ndx < index && version_definition->vd_next) {
+    const char *const version_definition_as_char =
+        reinterpret_cast<const char *>(version_definition);
+    version_definition =
+        reinterpret_cast<const ElfW(Verdef) *>(version_definition_as_char +
+                                               version_definition->vd_next);
+  }
+  return version_definition->vd_ndx == index ? version_definition : nullptr;
+}
+
+const ElfW(Verdaux) *ElfMemImage::GetVerdefAux(
+    const ElfW(Verdef) *verdef) const {
+  return reinterpret_cast<const ElfW(Verdaux) *>(verdef+1);
+}
+
+const char *ElfMemImage::GetVerstr(ElfW(Word) offset) const {
+  ABSL_RAW_CHECK(offset < strsize_, "offset out of range");
+  return dynstr_ + offset;
+}
+
+void ElfMemImage::Init(const void *base) {
+  ehdr_      = nullptr;
+  dynsym_    = nullptr;
+  dynstr_    = nullptr;
+  versym_    = nullptr;
+  verdef_    = nullptr;
+  hash_      = nullptr;
+  strsize_   = 0;
+  verdefnum_ = 0;
+  link_base_ = ~0L;  // Sentinel: PT_LOAD .p_vaddr can't possibly be this.
+  if (!base) {
+    return;
+  }
+  const char *const base_as_char = reinterpret_cast<const char *>(base);
+  if (base_as_char[EI_MAG0] != ELFMAG0 || base_as_char[EI_MAG1] != ELFMAG1 ||
+      base_as_char[EI_MAG2] != ELFMAG2 || base_as_char[EI_MAG3] != ELFMAG3) {
+    assert(false);
+    return;
+  }
+  int elf_class = base_as_char[EI_CLASS];
+  if (elf_class != kElfClass) {
+    assert(false);
+    return;
+  }
+  switch (base_as_char[EI_DATA]) {
+    case ELFDATA2LSB: {
 #ifndef ABSL_IS_LITTLE_ENDIAN
       assert(false);
       return;
 #endif
-      break; 
-    } 
-    case ELFDATA2MSB: { 
+      break;
+    }
+    case ELFDATA2MSB: {
 #ifndef ABSL_IS_BIG_ENDIAN
       assert(false);
       return;
 #endif
-      break; 
-    } 
-    default: { 
-      assert(false); 
-      return; 
-    } 
-  } 
- 
-  ehdr_ = reinterpret_cast<const ElfW(Ehdr) *>(base); 
-  const ElfW(Phdr) *dynamic_program_header = nullptr; 
-  for (int i = 0; i < ehdr_->e_phnum; ++i) { 
-    const ElfW(Phdr) *const program_header = GetPhdr(i); 
-    switch (program_header->p_type) { 
-      case PT_LOAD: 
-        if (!~link_base_) { 
-          link_base_ = program_header->p_vaddr; 
-        } 
-        break; 
-      case PT_DYNAMIC: 
-        dynamic_program_header = program_header; 
-        break; 
-    } 
-  } 
-  if (!~link_base_ || !dynamic_program_header) { 
-    assert(false); 
-    // Mark this image as not present. Can not recur infinitely. 
-    Init(nullptr); 
-    return; 
-  } 
-  ptrdiff_t relocation = 
-      base_as_char - reinterpret_cast<const char *>(link_base_); 
-  ElfW(Dyn) *dynamic_entry = 
-      reinterpret_cast<ElfW(Dyn) *>(dynamic_program_header->p_vaddr + 
-                                    relocation); 
-  for (; dynamic_entry->d_tag != DT_NULL; ++dynamic_entry) { 
+      break;
+    }
+    default: {
+      assert(false);
+      return;
+    }
+  }
+
+  ehdr_ = reinterpret_cast<const ElfW(Ehdr) *>(base);
+  const ElfW(Phdr) *dynamic_program_header = nullptr;
+  for (int i = 0; i < ehdr_->e_phnum; ++i) {
+    const ElfW(Phdr) *const program_header = GetPhdr(i);
+    switch (program_header->p_type) {
+      case PT_LOAD:
+        if (!~link_base_) {
+          link_base_ = program_header->p_vaddr;
+        }
+        break;
+      case PT_DYNAMIC:
+        dynamic_program_header = program_header;
+        break;
+    }
+  }
+  if (!~link_base_ || !dynamic_program_header) {
+    assert(false);
+    // Mark this image as not present. Can not recur infinitely.
+    Init(nullptr);
+    return;
+  }
+  ptrdiff_t relocation =
+      base_as_char - reinterpret_cast<const char *>(link_base_);
+  ElfW(Dyn) *dynamic_entry =
+      reinterpret_cast<ElfW(Dyn) *>(dynamic_program_header->p_vaddr +
+                                    relocation);
+  for (; dynamic_entry->d_tag != DT_NULL; ++dynamic_entry) {
     const auto value = dynamic_entry->d_un.d_val + relocation;
-    switch (dynamic_entry->d_tag) { 
-      case DT_HASH: 
-        hash_ = reinterpret_cast<ElfW(Word) *>(value); 
-        break; 
-      case DT_SYMTAB: 
-        dynsym_ = reinterpret_cast<ElfW(Sym) *>(value); 
-        break; 
-      case DT_STRTAB: 
-        dynstr_ = reinterpret_cast<const char *>(value); 
-        break; 
-      case DT_VERSYM: 
-        versym_ = reinterpret_cast<ElfW(Versym) *>(value); 
-        break; 
-      case DT_VERDEF: 
-        verdef_ = reinterpret_cast<ElfW(Verdef) *>(value); 
-        break; 
-      case DT_VERDEFNUM: 
-        verdefnum_ = dynamic_entry->d_un.d_val; 
-        break; 
-      case DT_STRSZ: 
-        strsize_ = dynamic_entry->d_un.d_val; 
-        break; 
-      default: 
-        // Unrecognized entries explicitly ignored. 
-        break; 
-    } 
-  } 
-  if (!hash_ || !dynsym_ || !dynstr_ || !versym_ || 
-      !verdef_ || !verdefnum_ || !strsize_) { 
-    assert(false);  // invalid VDSO 
-    // Mark this image as not present. Can not recur infinitely. 
-    Init(nullptr); 
-    return; 
-  } 
-} 
- 
-bool ElfMemImage::LookupSymbol(const char *name, 
-                               const char *version, 
-                               int type, 
-                               SymbolInfo *info_out) const { 
-  for (const SymbolInfo& info : *this) { 
-    if (strcmp(info.name, name) == 0 && strcmp(info.version, version) == 0 && 
-        ElfType(info.symbol) == type) { 
-      if (info_out) { 
-        *info_out = info; 
-      } 
-      return true; 
-    } 
-  } 
-  return false; 
-} 
- 
-bool ElfMemImage::LookupSymbolByAddress(const void *address, 
-                                        SymbolInfo *info_out) const { 
-  for (const SymbolInfo& info : *this) { 
-    const char *const symbol_start = 
-        reinterpret_cast<const char *>(info.address); 
-    const char *const symbol_end = symbol_start + info.symbol->st_size; 
-    if (symbol_start <= address && address < symbol_end) { 
-      if (info_out) { 
-        // Client wants to know details for that symbol (the usual case). 
-        if (ElfBind(info.symbol) == STB_GLOBAL) { 
-          // Strong symbol; just return it. 
-          *info_out = info; 
-          return true; 
-        } else { 
-          // Weak or local. Record it, but keep looking for a strong one. 
-          *info_out = info; 
-        } 
-      } else { 
-        // Client only cares if there is an overlapping symbol. 
-        return true; 
-      } 
-    } 
-  } 
-  return false; 
-} 
- 
-ElfMemImage::SymbolIterator::SymbolIterator(const void *const image, int index) 
-    : index_(index), image_(image) { 
-} 
- 
-const ElfMemImage::SymbolInfo *ElfMemImage::SymbolIterator::operator->() const { 
-  return &info_; 
-} 
- 
-const ElfMemImage::SymbolInfo& ElfMemImage::SymbolIterator::operator*() const { 
-  return info_; 
-} 
- 
-bool ElfMemImage::SymbolIterator::operator==(const SymbolIterator &rhs) const { 
-  return this->image_ == rhs.image_ && this->index_ == rhs.index_; 
-} 
- 
-bool ElfMemImage::SymbolIterator::operator!=(const SymbolIterator &rhs) const { 
-  return !(*this == rhs); 
-} 
- 
-ElfMemImage::SymbolIterator &ElfMemImage::SymbolIterator::operator++() { 
-  this->Update(1); 
-  return *this; 
-} 
- 
-ElfMemImage::SymbolIterator ElfMemImage::begin() const { 
-  SymbolIterator it(this, 0); 
-  it.Update(0); 
-  return it; 
-} 
- 
-ElfMemImage::SymbolIterator ElfMemImage::end() const { 
-  return SymbolIterator(this, GetNumSymbols()); 
-} 
- 
-void ElfMemImage::SymbolIterator::Update(int increment) { 
-  const ElfMemImage *image = reinterpret_cast<const ElfMemImage *>(image_); 
-  ABSL_RAW_CHECK(image->IsPresent() || increment == 0, ""); 
-  if (!image->IsPresent()) { 
-    return; 
-  } 
-  index_ += increment; 
-  if (index_ >= image->GetNumSymbols()) { 
-    index_ = image->GetNumSymbols(); 
-    return; 
-  } 
-  const ElfW(Sym)    *symbol = image->GetDynsym(index_); 
-  const ElfW(Versym) *version_symbol = image->GetVersym(index_); 
-  ABSL_RAW_CHECK(symbol && version_symbol, ""); 
-  const char *const symbol_name = image->GetDynstr(symbol->st_name); 
-  const ElfW(Versym) version_index = version_symbol[0] & VERSYM_VERSION; 
-  const ElfW(Verdef) *version_definition = nullptr; 
-  const char *version_name = ""; 
-  if (symbol->st_shndx == SHN_UNDEF) { 
-    // Undefined symbols reference DT_VERNEED, not DT_VERDEF, and 
-    // version_index could well be greater than verdefnum_, so calling 
-    // GetVerdef(version_index) may trigger assertion. 
-  } else { 
-    version_definition = image->GetVerdef(version_index); 
-  } 
-  if (version_definition) { 
-    // I am expecting 1 or 2 auxiliary entries: 1 for the version itself, 
-    // optional 2nd if the version has a parent. 
-    ABSL_RAW_CHECK( 
-        version_definition->vd_cnt == 1 || version_definition->vd_cnt == 2, 
-        "wrong number of entries"); 
-    const ElfW(Verdaux) *version_aux = image->GetVerdefAux(version_definition); 
-    version_name = image->GetVerstr(version_aux->vda_name); 
-  } 
-  info_.name    = symbol_name; 
-  info_.version = version_name; 
-  info_.address = image->GetSymAddr(symbol); 
-  info_.symbol  = symbol; 
-} 
- 
-}  // namespace debugging_internal 
+    switch (dynamic_entry->d_tag) {
+      case DT_HASH:
+        hash_ = reinterpret_cast<ElfW(Word) *>(value);
+        break;
+      case DT_SYMTAB:
+        dynsym_ = reinterpret_cast<ElfW(Sym) *>(value);
+        break;
+      case DT_STRTAB:
+        dynstr_ = reinterpret_cast<const char *>(value);
+        break;
+      case DT_VERSYM:
+        versym_ = reinterpret_cast<ElfW(Versym) *>(value);
+        break;
+      case DT_VERDEF:
+        verdef_ = reinterpret_cast<ElfW(Verdef) *>(value);
+        break;
+      case DT_VERDEFNUM:
+        verdefnum_ = dynamic_entry->d_un.d_val;
+        break;
+      case DT_STRSZ:
+        strsize_ = dynamic_entry->d_un.d_val;
+        break;
+      default:
+        // Unrecognized entries explicitly ignored.
+        break;
+    }
+  }
+  if (!hash_ || !dynsym_ || !dynstr_ || !versym_ ||
+      !verdef_ || !verdefnum_ || !strsize_) {
+    assert(false);  // invalid VDSO
+    // Mark this image as not present. Can not recur infinitely.
+    Init(nullptr);
+    return;
+  }
+}
+
+bool ElfMemImage::LookupSymbol(const char *name,
+                               const char *version,
+                               int type,
+                               SymbolInfo *info_out) const {
+  for (const SymbolInfo& info : *this) {
+    if (strcmp(info.name, name) == 0 && strcmp(info.version, version) == 0 &&
+        ElfType(info.symbol) == type) {
+      if (info_out) {
+        *info_out = info;
+      }
+      return true;
+    }
+  }
+  return false;
+}
+
+bool ElfMemImage::LookupSymbolByAddress(const void *address,
+                                        SymbolInfo *info_out) const {
+  for (const SymbolInfo& info : *this) {
+    const char *const symbol_start =
+        reinterpret_cast<const char *>(info.address);
+    const char *const symbol_end = symbol_start + info.symbol->st_size;
+    if (symbol_start <= address && address < symbol_end) {
+      if (info_out) {
+        // Client wants to know details for that symbol (the usual case).
+        if (ElfBind(info.symbol) == STB_GLOBAL) {
+          // Strong symbol; just return it.
+          *info_out = info;
+          return true;
+        } else {
+          // Weak or local. Record it, but keep looking for a strong one.
+          *info_out = info;
+        }
+      } else {
+        // Client only cares if there is an overlapping symbol.
+        return true;
+      }
+    }
+  }
+  return false;
+}
+
+ElfMemImage::SymbolIterator::SymbolIterator(const void *const image, int index)
+    : index_(index), image_(image) {
+}
+
+const ElfMemImage::SymbolInfo *ElfMemImage::SymbolIterator::operator->() const {
+  return &info_;
+}
+
+const ElfMemImage::SymbolInfo& ElfMemImage::SymbolIterator::operator*() const {
+  return info_;
+}
+
+bool ElfMemImage::SymbolIterator::operator==(const SymbolIterator &rhs) const {
+  return this->image_ == rhs.image_ && this->index_ == rhs.index_;
+}
+
+bool ElfMemImage::SymbolIterator::operator!=(const SymbolIterator &rhs) const {
+  return !(*this == rhs);
+}
+
+ElfMemImage::SymbolIterator &ElfMemImage::SymbolIterator::operator++() {
+  this->Update(1);
+  return *this;
+}
+
+ElfMemImage::SymbolIterator ElfMemImage::begin() const {
+  SymbolIterator it(this, 0);
+  it.Update(0);
+  return it;
+}
+
+ElfMemImage::SymbolIterator ElfMemImage::end() const {
+  return SymbolIterator(this, GetNumSymbols());
+}
+
+void ElfMemImage::SymbolIterator::Update(int increment) {
+  const ElfMemImage *image = reinterpret_cast<const ElfMemImage *>(image_);
+  ABSL_RAW_CHECK(image->IsPresent() || increment == 0, "");
+  if (!image->IsPresent()) {
+    return;
+  }
+  index_ += increment;
+  if (index_ >= image->GetNumSymbols()) {
+    index_ = image->GetNumSymbols();
+    return;
+  }
+  const ElfW(Sym)    *symbol = image->GetDynsym(index_);
+  const ElfW(Versym) *version_symbol = image->GetVersym(index_);
+  ABSL_RAW_CHECK(symbol && version_symbol, "");
+  const char *const symbol_name = image->GetDynstr(symbol->st_name);
+  const ElfW(Versym) version_index = version_symbol[0] & VERSYM_VERSION;
+  const ElfW(Verdef) *version_definition = nullptr;
+  const char *version_name = "";
+  if (symbol->st_shndx == SHN_UNDEF) {
+    // Undefined symbols reference DT_VERNEED, not DT_VERDEF, and
+    // version_index could well be greater than verdefnum_, so calling
+    // GetVerdef(version_index) may trigger assertion.
+  } else {
+    version_definition = image->GetVerdef(version_index);
+  }
+  if (version_definition) {
+    // I am expecting 1 or 2 auxiliary entries: 1 for the version itself,
+    // optional 2nd if the version has a parent.
+    ABSL_RAW_CHECK(
+        version_definition->vd_cnt == 1 || version_definition->vd_cnt == 2,
+        "wrong number of entries");
+    const ElfW(Verdaux) *version_aux = image->GetVerdefAux(version_definition);
+    version_name = image->GetVerstr(version_aux->vda_name);
+  }
+  info_.name    = symbol_name;
+  info_.version = version_name;
+  info_.address = image->GetSymAddr(symbol);
+  info_.symbol  = symbol;
+}
+
+}  // namespace debugging_internal
 ABSL_NAMESPACE_END
 }  // namespace y_absl
- 
-#endif  // ABSL_HAVE_ELF_MEM_IMAGE 
+
+#endif  // ABSL_HAVE_ELF_MEM_IMAGE
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/elf_mem_image.h b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/elf_mem_image.h
index 792122752c..13a6b2e664 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/elf_mem_image.h
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/elf_mem_image.h
@@ -1,138 +1,138 @@
-/* 
- * Copyright 2017 The Abseil Authors. 
- * 
- * Licensed under the Apache License, Version 2.0 (the "License"); 
- * you may not use this file except in compliance with the License. 
- * You may obtain a copy of the License at 
- * 
- *      https://www.apache.org/licenses/LICENSE-2.0 
- * 
- * Unless required by applicable law or agreed to in writing, software 
- * distributed under the License is distributed on an "AS IS" BASIS, 
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
- * See the License for the specific language governing permissions and 
- * limitations under the License. 
- */ 
- 
-// Allow dynamic symbol lookup for in-memory Elf images. 
- 
-#ifndef ABSL_DEBUGGING_INTERNAL_ELF_MEM_IMAGE_H_ 
-#define ABSL_DEBUGGING_INTERNAL_ELF_MEM_IMAGE_H_ 
- 
-// Including this will define the __GLIBC__ macro if glibc is being 
-// used. 
-#include <climits> 
- 
+/*
+ * Copyright 2017 The Abseil Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// Allow dynamic symbol lookup for in-memory Elf images.
+
+#ifndef ABSL_DEBUGGING_INTERNAL_ELF_MEM_IMAGE_H_
+#define ABSL_DEBUGGING_INTERNAL_ELF_MEM_IMAGE_H_
+
+// Including this will define the __GLIBC__ macro if glibc is being
+// used.
+#include <climits>
+
 #include "y_absl/base/config.h"
 
-// Maybe one day we can rewrite this file not to require the elf 
-// symbol extensions in glibc, but for right now we need them. 
-#ifdef ABSL_HAVE_ELF_MEM_IMAGE 
-#error ABSL_HAVE_ELF_MEM_IMAGE cannot be directly set 
-#endif 
- 
+// Maybe one day we can rewrite this file not to require the elf
+// symbol extensions in glibc, but for right now we need them.
+#ifdef ABSL_HAVE_ELF_MEM_IMAGE
+#error ABSL_HAVE_ELF_MEM_IMAGE cannot be directly set
+#endif
+
 #if defined(__ELF__) && !defined(__native_client__) && !defined(__asmjs__) && \
     !defined(__wasm__)
-#define ABSL_HAVE_ELF_MEM_IMAGE 1 
-#endif 
- 
-#ifdef ABSL_HAVE_ELF_MEM_IMAGE 
- 
-#include <link.h>  // for ElfW 
- 
+#define ABSL_HAVE_ELF_MEM_IMAGE 1
+#endif
+
+#ifdef ABSL_HAVE_ELF_MEM_IMAGE
+
+#include <link.h>  // for ElfW
+
 #if defined(__FreeBSD__) && !defined(ElfW)
 #define ElfW(x) __ElfN(x)
 #endif
 
 namespace y_absl {
 ABSL_NAMESPACE_BEGIN
-namespace debugging_internal { 
- 
-// An in-memory ELF image (may not exist on disk). 
-class ElfMemImage { 
- private: 
-  // Sentinel: there could never be an elf image at &kInvalidBaseSentinel. 
-  static const int kInvalidBaseSentinel; 
- 
- public: 
-  // Sentinel: there could never be an elf image at this address. 
-  static constexpr const void *const kInvalidBase = 
-    static_cast<const void*>(&kInvalidBaseSentinel); 
- 
-  // Information about a single vdso symbol. 
-  // All pointers are into .dynsym, .dynstr, or .text of the VDSO. 
-  // Do not free() them or modify through them. 
-  struct SymbolInfo { 
-    const char      *name;      // E.g. "__vdso_getcpu" 
-    const char      *version;   // E.g. "LINUX_2.6", could be "" 
-                                // for unversioned symbol. 
-    const void      *address;   // Relocated symbol address. 
-    const ElfW(Sym) *symbol;    // Symbol in the dynamic symbol table. 
-  }; 
- 
-  // Supports iteration over all dynamic symbols. 
-  class SymbolIterator { 
-   public: 
-    friend class ElfMemImage; 
-    const SymbolInfo *operator->() const; 
-    const SymbolInfo &operator*() const; 
-    SymbolIterator& operator++(); 
-    bool operator!=(const SymbolIterator &rhs) const; 
-    bool operator==(const SymbolIterator &rhs) const; 
-   private: 
-    SymbolIterator(const void *const image, int index); 
-    void Update(int incr); 
-    SymbolInfo info_; 
-    int index_; 
-    const void *const image_; 
-  }; 
- 
- 
-  explicit ElfMemImage(const void *base); 
-  void                 Init(const void *base); 
-  bool                 IsPresent() const { return ehdr_ != nullptr; } 
-  const ElfW(Phdr)*    GetPhdr(int index) const; 
-  const ElfW(Sym)*     GetDynsym(int index) const; 
-  const ElfW(Versym)*  GetVersym(int index) const; 
-  const ElfW(Verdef)*  GetVerdef(int index) const; 
-  const ElfW(Verdaux)* GetVerdefAux(const ElfW(Verdef) *verdef) const; 
-  const char*          GetDynstr(ElfW(Word) offset) const; 
-  const void*          GetSymAddr(const ElfW(Sym) *sym) const; 
-  const char*          GetVerstr(ElfW(Word) offset) const; 
-  int                  GetNumSymbols() const; 
- 
-  SymbolIterator begin() const; 
-  SymbolIterator end() const; 
- 
-  // Look up versioned dynamic symbol in the image. 
-  // Returns false if image is not present, or doesn't contain given 
-  // symbol/version/type combination. 
-  // If info_out is non-null, additional details are filled in. 
-  bool LookupSymbol(const char *name, const char *version, 
-                    int symbol_type, SymbolInfo *info_out) const; 
- 
-  // Find info about symbol (if any) which overlaps given address. 
-  // Returns true if symbol was found; false if image isn't present 
-  // or doesn't have a symbol overlapping given address. 
-  // If info_out is non-null, additional details are filled in. 
-  bool LookupSymbolByAddress(const void *address, SymbolInfo *info_out) const; 
- 
- private: 
-  const ElfW(Ehdr) *ehdr_; 
-  const ElfW(Sym) *dynsym_; 
-  const ElfW(Versym) *versym_; 
-  const ElfW(Verdef) *verdef_; 
-  const ElfW(Word) *hash_; 
-  const char *dynstr_; 
-  size_t strsize_; 
-  size_t verdefnum_; 
-  ElfW(Addr) link_base_;     // Link-time base (p_vaddr of first PT_LOAD). 
-}; 
- 
-}  // namespace debugging_internal 
+namespace debugging_internal {
+
+// An in-memory ELF image (may not exist on disk).
+class ElfMemImage {
+ private:
+  // Sentinel: there could never be an elf image at &kInvalidBaseSentinel.
+  static const int kInvalidBaseSentinel;
+
+ public:
+  // Sentinel: there could never be an elf image at this address.
+  static constexpr const void *const kInvalidBase =
+    static_cast<const void*>(&kInvalidBaseSentinel);
+
+  // Information about a single vdso symbol.
+  // All pointers are into .dynsym, .dynstr, or .text of the VDSO.
+  // Do not free() them or modify through them.
+  struct SymbolInfo {
+    const char      *name;      // E.g. "__vdso_getcpu"
+    const char      *version;   // E.g. "LINUX_2.6", could be ""
+                                // for unversioned symbol.
+    const void      *address;   // Relocated symbol address.
+    const ElfW(Sym) *symbol;    // Symbol in the dynamic symbol table.
+  };
+
+  // Supports iteration over all dynamic symbols.
+  class SymbolIterator {
+   public:
+    friend class ElfMemImage;
+    const SymbolInfo *operator->() const;
+    const SymbolInfo &operator*() const;
+    SymbolIterator& operator++();
+    bool operator!=(const SymbolIterator &rhs) const;
+    bool operator==(const SymbolIterator &rhs) const;
+   private:
+    SymbolIterator(const void *const image, int index);
+    void Update(int incr);
+    SymbolInfo info_;
+    int index_;
+    const void *const image_;
+  };
+
+
+  explicit ElfMemImage(const void *base);
+  void                 Init(const void *base);
+  bool                 IsPresent() const { return ehdr_ != nullptr; }
+  const ElfW(Phdr)*    GetPhdr(int index) const;
+  const ElfW(Sym)*     GetDynsym(int index) const;
+  const ElfW(Versym)*  GetVersym(int index) const;
+  const ElfW(Verdef)*  GetVerdef(int index) const;
+  const ElfW(Verdaux)* GetVerdefAux(const ElfW(Verdef) *verdef) const;
+  const char*          GetDynstr(ElfW(Word) offset) const;
+  const void*          GetSymAddr(const ElfW(Sym) *sym) const;
+  const char*          GetVerstr(ElfW(Word) offset) const;
+  int                  GetNumSymbols() const;
+
+  SymbolIterator begin() const;
+  SymbolIterator end() const;
+
+  // Look up versioned dynamic symbol in the image.
+  // Returns false if image is not present, or doesn't contain given
+  // symbol/version/type combination.
+  // If info_out is non-null, additional details are filled in.
+  bool LookupSymbol(const char *name, const char *version,
+                    int symbol_type, SymbolInfo *info_out) const;
+
+  // Find info about symbol (if any) which overlaps given address.
+  // Returns true if symbol was found; false if image isn't present
+  // or doesn't have a symbol overlapping given address.
+  // If info_out is non-null, additional details are filled in.
+  bool LookupSymbolByAddress(const void *address, SymbolInfo *info_out) const;
+
+ private:
+  const ElfW(Ehdr) *ehdr_;
+  const ElfW(Sym) *dynsym_;
+  const ElfW(Versym) *versym_;
+  const ElfW(Verdef) *verdef_;
+  const ElfW(Word) *hash_;
+  const char *dynstr_;
+  size_t strsize_;
+  size_t verdefnum_;
+  ElfW(Addr) link_base_;     // Link-time base (p_vaddr of first PT_LOAD).
+};
+
+}  // namespace debugging_internal
 ABSL_NAMESPACE_END
 }  // namespace y_absl
- 
-#endif  // ABSL_HAVE_ELF_MEM_IMAGE 
- 
-#endif  // ABSL_DEBUGGING_INTERNAL_ELF_MEM_IMAGE_H_ 
+
+#endif  // ABSL_HAVE_ELF_MEM_IMAGE
+
+#endif  // ABSL_DEBUGGING_INTERNAL_ELF_MEM_IMAGE_H_
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/examine_stack.cc b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/examine_stack.cc
index 567d9a6dfb..c59d92b6a3 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/examine_stack.cc
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/examine_stack.cc
@@ -1,91 +1,91 @@
-// 
-// Copyright 2018 The Abseil Authors. 
-// 
-// Licensed under the Apache License, Version 2.0 (the "License"); 
-// you may not use this file except in compliance with the License. 
-// You may obtain a copy of the License at 
-// 
-//      https://www.apache.org/licenses/LICENSE-2.0 
-// 
-// Unless required by applicable law or agreed to in writing, software 
-// distributed under the License is distributed on an "AS IS" BASIS, 
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
-// See the License for the specific language governing permissions and 
-// limitations under the License. 
-// 
- 
+//
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
 #include "y_absl/debugging/internal/examine_stack.h"
- 
-#ifndef _WIN32 
-#include <unistd.h> 
-#endif 
- 
+
+#ifndef _WIN32
+#include <unistd.h>
+#endif
+
 #ifdef __APPLE__
 #include <sys/ucontext.h>
 #endif
 
-#include <csignal> 
-#include <cstdio> 
- 
+#include <csignal>
+#include <cstdio>
+
 #include "y_absl/base/attributes.h"
 #include "y_absl/base/internal/raw_logging.h"
 #include "y_absl/base/macros.h"
 #include "y_absl/debugging/stacktrace.h"
 #include "y_absl/debugging/symbolize.h"
- 
+
 namespace y_absl {
 ABSL_NAMESPACE_BEGIN
-namespace debugging_internal { 
- 
-// Returns the program counter from signal context, nullptr if 
-// unknown. vuc is a ucontext_t*. We use void* to avoid the use of 
-// ucontext_t on non-POSIX systems. 
-void* GetProgramCounter(void* vuc) { 
-#ifdef __linux__ 
-  if (vuc != nullptr) { 
-    ucontext_t* context = reinterpret_cast<ucontext_t*>(vuc); 
-#if defined(__aarch64__) 
-    return reinterpret_cast<void*>(context->uc_mcontext.pc); 
+namespace debugging_internal {
+
+// Returns the program counter from signal context, nullptr if
+// unknown. vuc is a ucontext_t*. We use void* to avoid the use of
+// ucontext_t on non-POSIX systems.
+void* GetProgramCounter(void* vuc) {
+#ifdef __linux__
+  if (vuc != nullptr) {
+    ucontext_t* context = reinterpret_cast<ucontext_t*>(vuc);
+#if defined(__aarch64__)
+    return reinterpret_cast<void*>(context->uc_mcontext.pc);
 #elif defined(__alpha__)
     return reinterpret_cast<void*>(context->uc_mcontext.sc_pc);
-#elif defined(__arm__) 
-    return reinterpret_cast<void*>(context->uc_mcontext.arm_pc); 
+#elif defined(__arm__)
+    return reinterpret_cast<void*>(context->uc_mcontext.arm_pc);
 #elif defined(__hppa__)
     return reinterpret_cast<void*>(context->uc_mcontext.sc_iaoq[0]);
-#elif defined(__i386__) 
-    if (14 < ABSL_ARRAYSIZE(context->uc_mcontext.gregs)) 
-      return reinterpret_cast<void*>(context->uc_mcontext.gregs[14]); 
+#elif defined(__i386__)
+    if (14 < ABSL_ARRAYSIZE(context->uc_mcontext.gregs))
+      return reinterpret_cast<void*>(context->uc_mcontext.gregs[14]);
 #elif defined(__ia64__)
     return reinterpret_cast<void*>(context->uc_mcontext.sc_ip);
 #elif defined(__m68k__)
     return reinterpret_cast<void*>(context->uc_mcontext.gregs[16]);
-#elif defined(__mips__) 
-    return reinterpret_cast<void*>(context->uc_mcontext.pc); 
-#elif defined(__powerpc64__) 
-    return reinterpret_cast<void*>(context->uc_mcontext.gp_regs[32]); 
-#elif defined(__powerpc__) 
+#elif defined(__mips__)
+    return reinterpret_cast<void*>(context->uc_mcontext.pc);
+#elif defined(__powerpc64__)
+    return reinterpret_cast<void*>(context->uc_mcontext.gp_regs[32]);
+#elif defined(__powerpc__)
     return reinterpret_cast<void*>(context->uc_mcontext.uc_regs->gregs[32]);
 #elif defined(__riscv)
     return reinterpret_cast<void*>(context->uc_mcontext.__gregs[REG_PC]);
-#elif defined(__s390__) && !defined(__s390x__) 
-    return reinterpret_cast<void*>(context->uc_mcontext.psw.addr & 0x7fffffff); 
-#elif defined(__s390__) && defined(__s390x__) 
-    return reinterpret_cast<void*>(context->uc_mcontext.psw.addr); 
+#elif defined(__s390__) && !defined(__s390x__)
+    return reinterpret_cast<void*>(context->uc_mcontext.psw.addr & 0x7fffffff);
+#elif defined(__s390__) && defined(__s390x__)
+    return reinterpret_cast<void*>(context->uc_mcontext.psw.addr);
 #elif defined(__sh__)
     return reinterpret_cast<void*>(context->uc_mcontext.pc);
 #elif defined(__sparc__) && !defined(__arch64__)
     return reinterpret_cast<void*>(context->uc_mcontext.gregs[19]);
 #elif defined(__sparc__) && defined(__arch64__)
     return reinterpret_cast<void*>(context->uc_mcontext.mc_gregs[19]);
-#elif defined(__x86_64__) 
-    if (16 < ABSL_ARRAYSIZE(context->uc_mcontext.gregs)) 
-      return reinterpret_cast<void*>(context->uc_mcontext.gregs[16]); 
+#elif defined(__x86_64__)
+    if (16 < ABSL_ARRAYSIZE(context->uc_mcontext.gregs))
+      return reinterpret_cast<void*>(context->uc_mcontext.gregs[16]);
 #elif defined(__e2k__)
     return reinterpret_cast<void*>(context->uc_mcontext.cr0_hi);
-#else 
-#error "Undefined Architecture." 
-#endif 
-  } 
+#else
+#error "Undefined Architecture."
+#endif
+  }
 #elif defined(__APPLE__)
   if (vuc != nullptr) {
     ucontext_t* signal_ucontext = reinterpret_cast<ucontext_t*>(vuc);
@@ -112,92 +112,92 @@ void* GetProgramCounter(void* vuc) {
 #endif
 #endif
   }
-#elif defined(__akaros__) 
-  auto* ctx = reinterpret_cast<struct user_context*>(vuc); 
-  return reinterpret_cast<void*>(get_user_ctx_pc(ctx)); 
-#endif 
-  static_cast<void>(vuc); 
-  return nullptr; 
-} 
- 
-// The %p field width for printf() functions is two characters per byte, 
-// and two extra for the leading "0x". 
-static constexpr int kPrintfPointerFieldWidth = 2 + 2 * sizeof(void*); 
- 
-// Print a program counter, its stack frame size, and its symbol name. 
-// Note that there is a separate symbolize_pc argument. Return addresses may be 
-// at the end of the function, and this allows the caller to back up from pc if 
-// appropriate. 
-static void DumpPCAndFrameSizeAndSymbol(void (*writerfn)(const char*, void*), 
-                                        void* writerfn_arg, void* pc, 
-                                        void* symbolize_pc, int framesize, 
-                                        const char* const prefix) { 
-  char tmp[1024]; 
-  const char* symbol = "(unknown)"; 
+#elif defined(__akaros__)
+  auto* ctx = reinterpret_cast<struct user_context*>(vuc);
+  return reinterpret_cast<void*>(get_user_ctx_pc(ctx));
+#endif
+  static_cast<void>(vuc);
+  return nullptr;
+}
+
+// The %p field width for printf() functions is two characters per byte,
+// and two extra for the leading "0x".
+static constexpr int kPrintfPointerFieldWidth = 2 + 2 * sizeof(void*);
+
+// Print a program counter, its stack frame size, and its symbol name.
+// Note that there is a separate symbolize_pc argument. Return addresses may be
+// at the end of the function, and this allows the caller to back up from pc if
+// appropriate.
+static void DumpPCAndFrameSizeAndSymbol(void (*writerfn)(const char*, void*),
+                                        void* writerfn_arg, void* pc,
+                                        void* symbolize_pc, int framesize,
+                                        const char* const prefix) {
+  char tmp[1024];
+  const char* symbol = "(unknown)";
   if (y_absl::Symbolize(symbolize_pc, tmp, sizeof(tmp))) {
-    symbol = tmp; 
-  } 
-  char buf[1024]; 
-  if (framesize <= 0) { 
-    snprintf(buf, sizeof(buf), "%s@ %*p  (unknown)  %s\n", prefix, 
-             kPrintfPointerFieldWidth, pc, symbol); 
-  } else { 
-    snprintf(buf, sizeof(buf), "%s@ %*p  %9d  %s\n", prefix, 
-             kPrintfPointerFieldWidth, pc, framesize, symbol); 
-  } 
-  writerfn(buf, writerfn_arg); 
-} 
- 
-// Print a program counter and the corresponding stack frame size. 
-static void DumpPCAndFrameSize(void (*writerfn)(const char*, void*), 
-                               void* writerfn_arg, void* pc, int framesize, 
-                               const char* const prefix) { 
-  char buf[100]; 
-  if (framesize <= 0) { 
-    snprintf(buf, sizeof(buf), "%s@ %*p  (unknown)\n", prefix, 
-             kPrintfPointerFieldWidth, pc); 
-  } else { 
-    snprintf(buf, sizeof(buf), "%s@ %*p  %9d\n", prefix, 
-             kPrintfPointerFieldWidth, pc, framesize); 
-  } 
-  writerfn(buf, writerfn_arg); 
-} 
- 
-void DumpPCAndFrameSizesAndStackTrace( 
-    void* pc, void* const stack[], int frame_sizes[], int depth, 
-    int min_dropped_frames, bool symbolize_stacktrace, 
-    void (*writerfn)(const char*, void*), void* writerfn_arg) { 
-  if (pc != nullptr) { 
-    // We don't know the stack frame size for PC, use 0. 
-    if (symbolize_stacktrace) { 
-      DumpPCAndFrameSizeAndSymbol(writerfn, writerfn_arg, pc, pc, 0, "PC: "); 
-    } else { 
-      DumpPCAndFrameSize(writerfn, writerfn_arg, pc, 0, "PC: "); 
-    } 
-  } 
-  for (int i = 0; i < depth; i++) { 
-    if (symbolize_stacktrace) { 
-      // Pass the previous address of pc as the symbol address because pc is a 
-      // return address, and an overrun may occur when the function ends with a 
-      // call to a function annotated noreturn (e.g. CHECK). Note that we don't 
-      // do this for pc above, as the adjustment is only correct for return 
-      // addresses. 
-      DumpPCAndFrameSizeAndSymbol(writerfn, writerfn_arg, stack[i], 
-                                  reinterpret_cast<char*>(stack[i]) - 1, 
-                                  frame_sizes[i], "    "); 
-    } else { 
-      DumpPCAndFrameSize(writerfn, writerfn_arg, stack[i], frame_sizes[i], 
-                         "    "); 
-    } 
-  } 
-  if (min_dropped_frames > 0) { 
-    char buf[100]; 
-    snprintf(buf, sizeof(buf), "    @ ... and at least %d more frames\n", 
-             min_dropped_frames); 
-    writerfn(buf, writerfn_arg); 
-  } 
-} 
- 
-}  // namespace debugging_internal 
+    symbol = tmp;
+  }
+  char buf[1024];
+  if (framesize <= 0) {
+    snprintf(buf, sizeof(buf), "%s@ %*p  (unknown)  %s\n", prefix,
+             kPrintfPointerFieldWidth, pc, symbol);
+  } else {
+    snprintf(buf, sizeof(buf), "%s@ %*p  %9d  %s\n", prefix,
+             kPrintfPointerFieldWidth, pc, framesize, symbol);
+  }
+  writerfn(buf, writerfn_arg);
+}
+
+// Print a program counter and the corresponding stack frame size.
+static void DumpPCAndFrameSize(void (*writerfn)(const char*, void*),
+                               void* writerfn_arg, void* pc, int framesize,
+                               const char* const prefix) {
+  char buf[100];
+  if (framesize <= 0) {
+    snprintf(buf, sizeof(buf), "%s@ %*p  (unknown)\n", prefix,
+             kPrintfPointerFieldWidth, pc);
+  } else {
+    snprintf(buf, sizeof(buf), "%s@ %*p  %9d\n", prefix,
+             kPrintfPointerFieldWidth, pc, framesize);
+  }
+  writerfn(buf, writerfn_arg);
+}
+
+void DumpPCAndFrameSizesAndStackTrace(
+    void* pc, void* const stack[], int frame_sizes[], int depth,
+    int min_dropped_frames, bool symbolize_stacktrace,
+    void (*writerfn)(const char*, void*), void* writerfn_arg) {
+  if (pc != nullptr) {
+    // We don't know the stack frame size for PC, use 0.
+    if (symbolize_stacktrace) {
+      DumpPCAndFrameSizeAndSymbol(writerfn, writerfn_arg, pc, pc, 0, "PC: ");
+    } else {
+      DumpPCAndFrameSize(writerfn, writerfn_arg, pc, 0, "PC: ");
+    }
+  }
+  for (int i = 0; i < depth; i++) {
+    if (symbolize_stacktrace) {
+      // Pass the previous address of pc as the symbol address because pc is a
+      // return address, and an overrun may occur when the function ends with a
+      // call to a function annotated noreturn (e.g. CHECK). Note that we don't
+      // do this for pc above, as the adjustment is only correct for return
+      // addresses.
+      DumpPCAndFrameSizeAndSymbol(writerfn, writerfn_arg, stack[i],
+                                  reinterpret_cast<char*>(stack[i]) - 1,
+                                  frame_sizes[i], "    ");
+    } else {
+      DumpPCAndFrameSize(writerfn, writerfn_arg, stack[i], frame_sizes[i],
+                         "    ");
+    }
+  }
+  if (min_dropped_frames > 0) {
+    char buf[100];
+    snprintf(buf, sizeof(buf), "    @ ... and at least %d more frames\n",
+             min_dropped_frames);
+    writerfn(buf, writerfn_arg);
+  }
+}
+
+}  // namespace debugging_internal
 ABSL_NAMESPACE_END
 }  // namespace y_absl
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/examine_stack.h b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/examine_stack.h
index c673def700..32892a1150 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/examine_stack.h
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/examine_stack.h
@@ -1,42 +1,42 @@
-// 
-// Copyright 2018 The Abseil Authors. 
-// 
-// Licensed under the Apache License, Version 2.0 (the "License"); 
-// you may not use this file except in compliance with the License. 
-// You may obtain a copy of the License at 
-// 
-//      https://www.apache.org/licenses/LICENSE-2.0 
-// 
-// Unless required by applicable law or agreed to in writing, software 
-// distributed under the License is distributed on an "AS IS" BASIS, 
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
-// See the License for the specific language governing permissions and 
-// limitations under the License. 
-// 
- 
-#ifndef ABSL_DEBUGGING_INTERNAL_EXAMINE_STACK_H_ 
-#define ABSL_DEBUGGING_INTERNAL_EXAMINE_STACK_H_ 
- 
+//
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#ifndef ABSL_DEBUGGING_INTERNAL_EXAMINE_STACK_H_
+#define ABSL_DEBUGGING_INTERNAL_EXAMINE_STACK_H_
+
 #include "y_absl/base/config.h"
 
 namespace y_absl {
 ABSL_NAMESPACE_BEGIN
-namespace debugging_internal { 
- 
-// Returns the program counter from signal context, or nullptr if 
-// unknown. `vuc` is a ucontext_t*. We use void* to avoid the use of 
-// ucontext_t on non-POSIX systems. 
-void* GetProgramCounter(void* vuc); 
- 
-// Uses `writerfn` to dump the program counter, stack trace, and stack 
-// frame sizes. 
-void DumpPCAndFrameSizesAndStackTrace( 
-    void* pc, void* const stack[], int frame_sizes[], int depth, 
-    int min_dropped_frames, bool symbolize_stacktrace, 
-    void (*writerfn)(const char*, void*), void* writerfn_arg); 
- 
-}  // namespace debugging_internal 
+namespace debugging_internal {
+
+// Returns the program counter from signal context, or nullptr if
+// unknown. `vuc` is a ucontext_t*. We use void* to avoid the use of
+// ucontext_t on non-POSIX systems.
+void* GetProgramCounter(void* vuc);
+
+// Uses `writerfn` to dump the program counter, stack trace, and stack
+// frame sizes.
+void DumpPCAndFrameSizesAndStackTrace(
+    void* pc, void* const stack[], int frame_sizes[], int depth,
+    int min_dropped_frames, bool symbolize_stacktrace,
+    void (*writerfn)(const char*, void*), void* writerfn_arg);
+
+}  // namespace debugging_internal
 ABSL_NAMESPACE_END
 }  // namespace y_absl
- 
-#endif  // ABSL_DEBUGGING_INTERNAL_EXAMINE_STACK_H_ 
+
+#endif  // ABSL_DEBUGGING_INTERNAL_EXAMINE_STACK_H_
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/stack_consumption.h b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/stack_consumption.h
index 781ac6874f..80137ad0eb 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/stack_consumption.h
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/stack_consumption.h
@@ -1,50 +1,50 @@
-// 
-// Copyright 2018 The Abseil Authors. 
-// 
-// Licensed under the Apache License, Version 2.0 (the "License"); 
-// you may not use this file except in compliance with the License. 
-// You may obtain a copy of the License at 
-// 
-//      https://www.apache.org/licenses/LICENSE-2.0 
-// 
-// Unless required by applicable law or agreed to in writing, software 
-// distributed under the License is distributed on an "AS IS" BASIS, 
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
-// See the License for the specific language governing permissions and 
-// limitations under the License. 
- 
-// Helper function for measuring stack consumption of signal handlers. 
- 
-#ifndef ABSL_DEBUGGING_INTERNAL_STACK_CONSUMPTION_H_ 
-#define ABSL_DEBUGGING_INTERNAL_STACK_CONSUMPTION_H_ 
- 
+//
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Helper function for measuring stack consumption of signal handlers.
+
+#ifndef ABSL_DEBUGGING_INTERNAL_STACK_CONSUMPTION_H_
+#define ABSL_DEBUGGING_INTERNAL_STACK_CONSUMPTION_H_
+
 #include "y_absl/base/config.h"
 
-// The code in this module is not portable. 
-// Use this feature test macro to detect its availability. 
-#ifdef ABSL_INTERNAL_HAVE_DEBUGGING_STACK_CONSUMPTION 
-#error ABSL_INTERNAL_HAVE_DEBUGGING_STACK_CONSUMPTION cannot be set directly 
+// The code in this module is not portable.
+// Use this feature test macro to detect its availability.
+#ifdef ABSL_INTERNAL_HAVE_DEBUGGING_STACK_CONSUMPTION
+#error ABSL_INTERNAL_HAVE_DEBUGGING_STACK_CONSUMPTION cannot be set directly
 #elif !defined(__APPLE__) && !defined(_WIN32) &&                     \
     (defined(__i386__) || defined(__x86_64__) || defined(__ppc__) || \
      defined(__aarch64__) || defined(__riscv))
-#define ABSL_INTERNAL_HAVE_DEBUGGING_STACK_CONSUMPTION 1 
- 
+#define ABSL_INTERNAL_HAVE_DEBUGGING_STACK_CONSUMPTION 1
+
 namespace y_absl {
 ABSL_NAMESPACE_BEGIN
-namespace debugging_internal { 
- 
-// Returns the stack consumption in bytes for the code exercised by 
-// signal_handler.  To measure stack consumption, signal_handler is registered 
-// as a signal handler, so the code that it exercises must be async-signal 
-// safe.  The argument of signal_handler is an implementation detail of signal 
-// handlers and should ignored by the code for signal_handler.  Use global 
-// variables to pass information between your test code and signal_handler. 
-int GetSignalHandlerStackConsumption(void (*signal_handler)(int)); 
- 
-}  // namespace debugging_internal 
+namespace debugging_internal {
+
+// Returns the stack consumption in bytes for the code exercised by
+// signal_handler.  To measure stack consumption, signal_handler is registered
+// as a signal handler, so the code that it exercises must be async-signal
+// safe.  The argument of signal_handler is an implementation detail of signal
+// handlers and should ignored by the code for signal_handler.  Use global
+// variables to pass information between your test code and signal_handler.
+int GetSignalHandlerStackConsumption(void (*signal_handler)(int));
+
+}  // namespace debugging_internal
 ABSL_NAMESPACE_END
 }  // namespace y_absl
- 
-#endif  // ABSL_INTERNAL_HAVE_DEBUGGING_STACK_CONSUMPTION 
- 
-#endif  // ABSL_DEBUGGING_INTERNAL_STACK_CONSUMPTION_H_ 
+
+#endif  // ABSL_INTERNAL_HAVE_DEBUGGING_STACK_CONSUMPTION
+
+#endif  // ABSL_DEBUGGING_INTERNAL_STACK_CONSUMPTION_H_
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/stacktrace_aarch64-inl.inc b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/stacktrace_aarch64-inl.inc
index 6e5097259c..700f607488 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/stacktrace_aarch64-inl.inc
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/stacktrace_aarch64-inl.inc
@@ -1,199 +1,199 @@
-#ifndef ABSL_DEBUGGING_INTERNAL_STACKTRACE_AARCH64_INL_H_ 
-#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_AARCH64_INL_H_ 
- 
-// Generate stack tracer for aarch64 
- 
-#if defined(__linux__) 
-#include <sys/mman.h> 
-#include <ucontext.h> 
-#include <unistd.h> 
-#endif 
- 
-#include <atomic> 
-#include <cassert> 
-#include <cstdint> 
-#include <iostream> 
- 
+#ifndef ABSL_DEBUGGING_INTERNAL_STACKTRACE_AARCH64_INL_H_
+#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_AARCH64_INL_H_
+
+// Generate stack tracer for aarch64
+
+#if defined(__linux__)
+#include <sys/mman.h>
+#include <ucontext.h>
+#include <unistd.h>
+#endif
+
+#include <atomic>
+#include <cassert>
+#include <cstdint>
+#include <iostream>
+
 #include "y_absl/base/attributes.h"
 #include "y_absl/debugging/internal/address_is_readable.h"
 #include "y_absl/debugging/internal/vdso_support.h"  // a no-op on non-elf or non-glibc systems
 #include "y_absl/debugging/stacktrace.h"
- 
-static const uintptr_t kUnknownFrameSize = 0; 
- 
-#if defined(__linux__) 
-// Returns the address of the VDSO __kernel_rt_sigreturn function, if present. 
-static const unsigned char* GetKernelRtSigreturnAddress() { 
-  constexpr uintptr_t kImpossibleAddress = 1; 
-  ABSL_CONST_INIT static std::atomic<uintptr_t> memoized{kImpossibleAddress}; 
-  uintptr_t address = memoized.load(std::memory_order_relaxed); 
-  if (address != kImpossibleAddress) { 
-    return reinterpret_cast<const unsigned char*>(address); 
-  } 
- 
-  address = reinterpret_cast<uintptr_t>(nullptr); 
- 
-#ifdef ABSL_HAVE_VDSO_SUPPORT 
+
+static const uintptr_t kUnknownFrameSize = 0;
+
+#if defined(__linux__)
+// Returns the address of the VDSO __kernel_rt_sigreturn function, if present.
+static const unsigned char* GetKernelRtSigreturnAddress() {
+  constexpr uintptr_t kImpossibleAddress = 1;
+  ABSL_CONST_INIT static std::atomic<uintptr_t> memoized{kImpossibleAddress};
+  uintptr_t address = memoized.load(std::memory_order_relaxed);
+  if (address != kImpossibleAddress) {
+    return reinterpret_cast<const unsigned char*>(address);
+  }
+
+  address = reinterpret_cast<uintptr_t>(nullptr);
+
+#ifdef ABSL_HAVE_VDSO_SUPPORT
   y_absl::debugging_internal::VDSOSupport vdso;
-  if (vdso.IsPresent()) { 
+  if (vdso.IsPresent()) {
     y_absl::debugging_internal::VDSOSupport::SymbolInfo symbol_info;
     auto lookup = [&](int type) {
       return vdso.LookupSymbol("__kernel_rt_sigreturn", "LINUX_2.6.39", type,
                                &symbol_info);
     };
     if ((!lookup(STT_FUNC) && !lookup(STT_NOTYPE)) ||
-        symbol_info.address == nullptr) { 
-      // Unexpected: VDSO is present, yet the expected symbol is missing 
-      // or null. 
-      assert(false && "VDSO is present, but doesn't have expected symbol"); 
-    } else { 
-      if (reinterpret_cast<uintptr_t>(symbol_info.address) != 
-          kImpossibleAddress) { 
-        address = reinterpret_cast<uintptr_t>(symbol_info.address); 
-      } else { 
-        assert(false && "VDSO returned invalid address"); 
-      } 
-    } 
-  } 
-#endif 
- 
-  memoized.store(address, std::memory_order_relaxed); 
-  return reinterpret_cast<const unsigned char*>(address); 
-} 
-#endif  // __linux__ 
- 
-// Compute the size of a stack frame in [low..high).  We assume that 
-// low < high.  Return size of kUnknownFrameSize. 
-template<typename T> 
-static inline uintptr_t ComputeStackFrameSize(const T* low, 
-                                              const T* high) { 
-  const char* low_char_ptr = reinterpret_cast<const char *>(low); 
-  const char* high_char_ptr = reinterpret_cast<const char *>(high); 
-  return low < high ? high_char_ptr - low_char_ptr : kUnknownFrameSize; 
-} 
- 
-// Given a pointer to a stack frame, locate and return the calling 
-// stackframe, or return null if no stackframe can be found. Perform sanity 
-// checks (the strictness of which is controlled by the boolean parameter 
-// "STRICT_UNWINDING") to reduce the chance that a bad pointer is returned. 
-template<bool STRICT_UNWINDING, bool WITH_CONTEXT> 
+        symbol_info.address == nullptr) {
+      // Unexpected: VDSO is present, yet the expected symbol is missing
+      // or null.
+      assert(false && "VDSO is present, but doesn't have expected symbol");
+    } else {
+      if (reinterpret_cast<uintptr_t>(symbol_info.address) !=
+          kImpossibleAddress) {
+        address = reinterpret_cast<uintptr_t>(symbol_info.address);
+      } else {
+        assert(false && "VDSO returned invalid address");
+      }
+    }
+  }
+#endif
+
+  memoized.store(address, std::memory_order_relaxed);
+  return reinterpret_cast<const unsigned char*>(address);
+}
+#endif  // __linux__
+
+// Compute the size of a stack frame in [low..high).  We assume that
+// low < high.  Return size of kUnknownFrameSize.
+template<typename T>
+static inline uintptr_t ComputeStackFrameSize(const T* low,
+                                              const T* high) {
+  const char* low_char_ptr = reinterpret_cast<const char *>(low);
+  const char* high_char_ptr = reinterpret_cast<const char *>(high);
+  return low < high ? high_char_ptr - low_char_ptr : kUnknownFrameSize;
+}
+
+// Given a pointer to a stack frame, locate and return the calling
+// stackframe, or return null if no stackframe can be found. Perform sanity
+// checks (the strictness of which is controlled by the boolean parameter
+// "STRICT_UNWINDING") to reduce the chance that a bad pointer is returned.
+template<bool STRICT_UNWINDING, bool WITH_CONTEXT>
 ABSL_ATTRIBUTE_NO_SANITIZE_ADDRESS  // May read random elements from stack.
 ABSL_ATTRIBUTE_NO_SANITIZE_MEMORY   // May read random elements from stack.
-static void **NextStackFrame(void **old_frame_pointer, const void *uc) { 
-  void **new_frame_pointer = reinterpret_cast<void**>(*old_frame_pointer); 
-  bool check_frame_size = true; 
- 
-#if defined(__linux__) 
-  if (WITH_CONTEXT && uc != nullptr) { 
-    // Check to see if next frame's return address is __kernel_rt_sigreturn. 
-    if (old_frame_pointer[1] == GetKernelRtSigreturnAddress()) { 
-      const ucontext_t *ucv = static_cast<const ucontext_t *>(uc); 
-      // old_frame_pointer[0] is not suitable for unwinding, look at 
-      // ucontext to discover frame pointer before signal. 
-      void **const pre_signal_frame_pointer = 
-          reinterpret_cast<void **>(ucv->uc_mcontext.regs[29]); 
- 
-      // Check that alleged frame pointer is actually readable. This is to 
-      // prevent "double fault" in case we hit the first fault due to e.g. 
-      // stack corruption. 
+static void **NextStackFrame(void **old_frame_pointer, const void *uc) {
+  void **new_frame_pointer = reinterpret_cast<void**>(*old_frame_pointer);
+  bool check_frame_size = true;
+
+#if defined(__linux__)
+  if (WITH_CONTEXT && uc != nullptr) {
+    // Check to see if next frame's return address is __kernel_rt_sigreturn.
+    if (old_frame_pointer[1] == GetKernelRtSigreturnAddress()) {
+      const ucontext_t *ucv = static_cast<const ucontext_t *>(uc);
+      // old_frame_pointer[0] is not suitable for unwinding, look at
+      // ucontext to discover frame pointer before signal.
+      void **const pre_signal_frame_pointer =
+          reinterpret_cast<void **>(ucv->uc_mcontext.regs[29]);
+
+      // Check that alleged frame pointer is actually readable. This is to
+      // prevent "double fault" in case we hit the first fault due to e.g.
+      // stack corruption.
       if (!y_absl::debugging_internal::AddressIsReadable(
-              pre_signal_frame_pointer)) 
-        return nullptr; 
- 
-      // Alleged frame pointer is readable, use it for further unwinding. 
-      new_frame_pointer = pre_signal_frame_pointer; 
- 
-      // Skip frame size check if we return from a signal. We may be using a 
-      // an alternate stack for signals. 
-      check_frame_size = false; 
-    } 
-  } 
-#endif 
- 
-  // aarch64 ABI requires stack pointer to be 16-byte-aligned. 
-  if ((reinterpret_cast<uintptr_t>(new_frame_pointer) & 15) != 0) 
-    return nullptr; 
- 
-  // Check frame size.  In strict mode, we assume frames to be under 
-  // 100,000 bytes.  In non-strict mode, we relax the limit to 1MB. 
-  if (check_frame_size) { 
-    const uintptr_t max_size = STRICT_UNWINDING ? 100000 : 1000000; 
-    const uintptr_t frame_size = 
-        ComputeStackFrameSize(old_frame_pointer, new_frame_pointer); 
-    if (frame_size == kUnknownFrameSize || frame_size > max_size) 
-      return nullptr; 
-  } 
- 
-  return new_frame_pointer; 
-} 
- 
-template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT> 
+              pre_signal_frame_pointer))
+        return nullptr;
+
+      // Alleged frame pointer is readable, use it for further unwinding.
+      new_frame_pointer = pre_signal_frame_pointer;
+
+      // Skip frame size check if we return from a signal. We may be using a
+      // an alternate stack for signals.
+      check_frame_size = false;
+    }
+  }
+#endif
+
+  // aarch64 ABI requires stack pointer to be 16-byte-aligned.
+  if ((reinterpret_cast<uintptr_t>(new_frame_pointer) & 15) != 0)
+    return nullptr;
+
+  // Check frame size.  In strict mode, we assume frames to be under
+  // 100,000 bytes.  In non-strict mode, we relax the limit to 1MB.
+  if (check_frame_size) {
+    const uintptr_t max_size = STRICT_UNWINDING ? 100000 : 1000000;
+    const uintptr_t frame_size =
+        ComputeStackFrameSize(old_frame_pointer, new_frame_pointer);
+    if (frame_size == kUnknownFrameSize || frame_size > max_size)
+      return nullptr;
+  }
+
+  return new_frame_pointer;
+}
+
+template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT>
 ABSL_ATTRIBUTE_NO_SANITIZE_ADDRESS  // May read random elements from stack.
 ABSL_ATTRIBUTE_NO_SANITIZE_MEMORY   // May read random elements from stack.
-static int UnwindImpl(void** result, int* sizes, int max_depth, int skip_count, 
-                      const void *ucp, int *min_dropped_frames) { 
-#ifdef __GNUC__ 
-  void **frame_pointer = reinterpret_cast<void**>(__builtin_frame_address(0)); 
-#else 
-# error reading stack point not yet supported on this platform. 
-#endif 
- 
-  skip_count++;    // Skip the frame for this function. 
-  int n = 0; 
- 
-  // The frame pointer points to low address of a frame.  The first 64-bit 
-  // word of a frame points to the next frame up the call chain, which normally 
-  // is just after the high address of the current frame.  The second word of 
-  // a frame contains return adress of to the caller.   To find a pc value 
-  // associated with the current frame, we need to go down a level in the call 
-  // chain.  So we remember return the address of the last frame seen.  This 
-  // does not work for the first stack frame, which belongs to UnwindImp() but 
-  // we skip the frame for UnwindImp() anyway. 
-  void* prev_return_address = nullptr; 
- 
-  while (frame_pointer && n < max_depth) { 
+static int UnwindImpl(void** result, int* sizes, int max_depth, int skip_count,
+                      const void *ucp, int *min_dropped_frames) {
+#ifdef __GNUC__
+  void **frame_pointer = reinterpret_cast<void**>(__builtin_frame_address(0));
+#else
+# error reading stack point not yet supported on this platform.
+#endif
+
+  skip_count++;    // Skip the frame for this function.
+  int n = 0;
+
+  // The frame pointer points to low address of a frame.  The first 64-bit
+  // word of a frame points to the next frame up the call chain, which normally
+  // is just after the high address of the current frame.  The second word of
+  // a frame contains return adress of to the caller.   To find a pc value
+  // associated with the current frame, we need to go down a level in the call
+  // chain.  So we remember return the address of the last frame seen.  This
+  // does not work for the first stack frame, which belongs to UnwindImp() but
+  // we skip the frame for UnwindImp() anyway.
+  void* prev_return_address = nullptr;
+
+  while (frame_pointer && n < max_depth) {
     // The y_absl::GetStackFrames routine is called when we are in some
-    // informational context (the failure signal handler for example). 
-    // Use the non-strict unwinding rules to produce a stack trace 
-    // that is as complete as possible (even if it contains a few bogus 
-    // entries in some rare cases). 
-    void **next_frame_pointer = 
-        NextStackFrame<!IS_STACK_FRAMES, IS_WITH_CONTEXT>(frame_pointer, ucp); 
- 
-    if (skip_count > 0) { 
-      skip_count--; 
-    } else { 
-      result[n] = prev_return_address; 
-      if (IS_STACK_FRAMES) { 
-        sizes[n] = ComputeStackFrameSize(frame_pointer, next_frame_pointer); 
-      } 
-      n++; 
-    } 
-    prev_return_address = frame_pointer[1]; 
-    frame_pointer = next_frame_pointer; 
-  } 
-  if (min_dropped_frames != nullptr) { 
-    // Implementation detail: we clamp the max of frames we are willing to 
-    // count, so as not to spend too much time in the loop below. 
-    const int kMaxUnwind = 200; 
-    int j = 0; 
-    for (; frame_pointer != nullptr && j < kMaxUnwind; j++) { 
-      frame_pointer = 
-          NextStackFrame<!IS_STACK_FRAMES, IS_WITH_CONTEXT>(frame_pointer, ucp); 
-    } 
-    *min_dropped_frames = j; 
-  } 
-  return n; 
-} 
- 
+    // informational context (the failure signal handler for example).
+    // Use the non-strict unwinding rules to produce a stack trace
+    // that is as complete as possible (even if it contains a few bogus
+    // entries in some rare cases).
+    void **next_frame_pointer =
+        NextStackFrame<!IS_STACK_FRAMES, IS_WITH_CONTEXT>(frame_pointer, ucp);
+
+    if (skip_count > 0) {
+      skip_count--;
+    } else {
+      result[n] = prev_return_address;
+      if (IS_STACK_FRAMES) {
+        sizes[n] = ComputeStackFrameSize(frame_pointer, next_frame_pointer);
+      }
+      n++;
+    }
+    prev_return_address = frame_pointer[1];
+    frame_pointer = next_frame_pointer;
+  }
+  if (min_dropped_frames != nullptr) {
+    // Implementation detail: we clamp the max of frames we are willing to
+    // count, so as not to spend too much time in the loop below.
+    const int kMaxUnwind = 200;
+    int j = 0;
+    for (; frame_pointer != nullptr && j < kMaxUnwind; j++) {
+      frame_pointer =
+          NextStackFrame<!IS_STACK_FRAMES, IS_WITH_CONTEXT>(frame_pointer, ucp);
+    }
+    *min_dropped_frames = j;
+  }
+  return n;
+}
+
 namespace y_absl {
 ABSL_NAMESPACE_BEGIN
-namespace debugging_internal { 
-bool StackTraceWorksForTest() { 
-  return true; 
-} 
-}  // namespace debugging_internal 
+namespace debugging_internal {
+bool StackTraceWorksForTest() {
+  return true;
+}
+}  // namespace debugging_internal
 ABSL_NAMESPACE_END
 }  // namespace y_absl
- 
-#endif  // ABSL_DEBUGGING_INTERNAL_STACKTRACE_AARCH64_INL_H_ 
+
+#endif  // ABSL_DEBUGGING_INTERNAL_STACKTRACE_AARCH64_INL_H_
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/stacktrace_arm-inl.inc b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/stacktrace_arm-inl.inc
index 56e49899cd..b73307120e 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/stacktrace_arm-inl.inc
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/stacktrace_arm-inl.inc
@@ -1,5 +1,5 @@
 // Copyright 2017 The Abseil Authors.
-// 
+//
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
@@ -12,123 +12,123 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 //
-// This is inspired by Craig Silverstein's PowerPC stacktrace code. 
- 
-#ifndef ABSL_DEBUGGING_INTERNAL_STACKTRACE_ARM_INL_H_ 
-#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_ARM_INL_H_ 
- 
-#include <cstdint> 
- 
+// This is inspired by Craig Silverstein's PowerPC stacktrace code.
+
+#ifndef ABSL_DEBUGGING_INTERNAL_STACKTRACE_ARM_INL_H_
+#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_ARM_INL_H_
+
+#include <cstdint>
+
 #include "y_absl/debugging/stacktrace.h"
- 
-// WARNING: 
-// This only works if all your code is in either ARM or THUMB mode.  With 
-// interworking, the frame pointer of the caller can either be in r11 (ARM 
-// mode) or r7 (THUMB mode).  A callee only saves the frame pointer of its 
-// mode in a fixed location on its stack frame.  If the caller is a different 
-// mode, there is no easy way to find the frame pointer.  It can either be 
-// still in the designated register or saved on stack along with other callee 
-// saved registers. 
- 
-// Given a pointer to a stack frame, locate and return the calling 
-// stackframe, or return nullptr if no stackframe can be found. Perform sanity 
-// checks (the strictness of which is controlled by the boolean parameter 
-// "STRICT_UNWINDING") to reduce the chance that a bad pointer is returned. 
-template<bool STRICT_UNWINDING> 
-static void **NextStackFrame(void **old_sp) { 
-  void **new_sp = (void**) old_sp[-1]; 
- 
-  // Check that the transition from frame pointer old_sp to frame 
-  // pointer new_sp isn't clearly bogus 
-  if (STRICT_UNWINDING) { 
-    // With the stack growing downwards, older stack frame must be 
-    // at a greater address that the current one. 
-    if (new_sp <= old_sp) return nullptr; 
-    // Assume stack frames larger than 100,000 bytes are bogus. 
-    if ((uintptr_t)new_sp - (uintptr_t)old_sp > 100000) return nullptr; 
-  } else { 
-    // In the non-strict mode, allow discontiguous stack frames. 
-    // (alternate-signal-stacks for example). 
-    if (new_sp == old_sp) return nullptr; 
-    // And allow frames upto about 1MB. 
-    if ((new_sp > old_sp) 
-        && ((uintptr_t)new_sp - (uintptr_t)old_sp > 1000000)) return nullptr; 
-  } 
-  if ((uintptr_t)new_sp & (sizeof(void *) - 1)) return nullptr; 
-  return new_sp; 
-} 
- 
+
+// WARNING:
+// This only works if all your code is in either ARM or THUMB mode.  With
+// interworking, the frame pointer of the caller can either be in r11 (ARM
+// mode) or r7 (THUMB mode).  A callee only saves the frame pointer of its
+// mode in a fixed location on its stack frame.  If the caller is a different
+// mode, there is no easy way to find the frame pointer.  It can either be
+// still in the designated register or saved on stack along with other callee
+// saved registers.
+
+// Given a pointer to a stack frame, locate and return the calling
+// stackframe, or return nullptr if no stackframe can be found. Perform sanity
+// checks (the strictness of which is controlled by the boolean parameter
+// "STRICT_UNWINDING") to reduce the chance that a bad pointer is returned.
+template<bool STRICT_UNWINDING>
+static void **NextStackFrame(void **old_sp) {
+  void **new_sp = (void**) old_sp[-1];
+
+  // Check that the transition from frame pointer old_sp to frame
+  // pointer new_sp isn't clearly bogus
+  if (STRICT_UNWINDING) {
+    // With the stack growing downwards, older stack frame must be
+    // at a greater address that the current one.
+    if (new_sp <= old_sp) return nullptr;
+    // Assume stack frames larger than 100,000 bytes are bogus.
+    if ((uintptr_t)new_sp - (uintptr_t)old_sp > 100000) return nullptr;
+  } else {
+    // In the non-strict mode, allow discontiguous stack frames.
+    // (alternate-signal-stacks for example).
+    if (new_sp == old_sp) return nullptr;
+    // And allow frames upto about 1MB.
+    if ((new_sp > old_sp)
+        && ((uintptr_t)new_sp - (uintptr_t)old_sp > 1000000)) return nullptr;
+  }
+  if ((uintptr_t)new_sp & (sizeof(void *) - 1)) return nullptr;
+  return new_sp;
+}
+
 // This ensures that y_absl::GetStackTrace sets up the Link Register properly.
-#ifdef __GNUC__ 
-void StacktraceArmDummyFunction() __attribute__((noinline)); 
-void StacktraceArmDummyFunction() { __asm__ volatile(""); } 
-#else 
-# error StacktraceArmDummyFunction() needs to be ported to this platform. 
-#endif 
- 
-template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT> 
-static int UnwindImpl(void** result, int* sizes, int max_depth, int skip_count, 
-                      const void * /* ucp */, int *min_dropped_frames) { 
-#ifdef __GNUC__ 
-  void **sp = reinterpret_cast<void**>(__builtin_frame_address(0)); 
-#else 
-# error reading stack point not yet supported on this platform. 
-#endif 
- 
-  // On ARM, the return address is stored in the link register (r14). 
-  // This is not saved on the stack frame of a leaf function.  To 
-  // simplify code that reads return addresses, we call a dummy 
-  // function so that the return address of this function is also 
-  // stored in the stack frame.  This works at least for gcc. 
-  StacktraceArmDummyFunction(); 
- 
-  int n = 0; 
-  while (sp && n < max_depth) { 
+#ifdef __GNUC__
+void StacktraceArmDummyFunction() __attribute__((noinline));
+void StacktraceArmDummyFunction() { __asm__ volatile(""); }
+#else
+# error StacktraceArmDummyFunction() needs to be ported to this platform.
+#endif
+
+template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT>
+static int UnwindImpl(void** result, int* sizes, int max_depth, int skip_count,
+                      const void * /* ucp */, int *min_dropped_frames) {
+#ifdef __GNUC__
+  void **sp = reinterpret_cast<void**>(__builtin_frame_address(0));
+#else
+# error reading stack point not yet supported on this platform.
+#endif
+
+  // On ARM, the return address is stored in the link register (r14).
+  // This is not saved on the stack frame of a leaf function.  To
+  // simplify code that reads return addresses, we call a dummy
+  // function so that the return address of this function is also
+  // stored in the stack frame.  This works at least for gcc.
+  StacktraceArmDummyFunction();
+
+  int n = 0;
+  while (sp && n < max_depth) {
     // The y_absl::GetStackFrames routine is called when we are in some
-    // informational context (the failure signal handler for example). 
-    // Use the non-strict unwinding rules to produce a stack trace 
-    // that is as complete as possible (even if it contains a few bogus 
-    // entries in some rare cases). 
-    void **next_sp = NextStackFrame<!IS_STACK_FRAMES>(sp); 
- 
-    if (skip_count > 0) { 
-      skip_count--; 
-    } else { 
-      result[n] = *sp; 
- 
-      if (IS_STACK_FRAMES) { 
-        if (next_sp > sp) { 
-          sizes[n] = (uintptr_t)next_sp - (uintptr_t)sp; 
-        } else { 
-          // A frame-size of 0 is used to indicate unknown frame size. 
-          sizes[n] = 0; 
-        } 
-      } 
-      n++; 
-    } 
-    sp = next_sp; 
-  } 
-  if (min_dropped_frames != nullptr) { 
-    // Implementation detail: we clamp the max of frames we are willing to 
-    // count, so as not to spend too much time in the loop below. 
-    const int kMaxUnwind = 200; 
-    int j = 0; 
-    for (; sp != nullptr && j < kMaxUnwind; j++) { 
-      sp = NextStackFrame<!IS_STACK_FRAMES>(sp); 
-    } 
-    *min_dropped_frames = j; 
-  } 
-  return n; 
-} 
- 
+    // informational context (the failure signal handler for example).
+    // Use the non-strict unwinding rules to produce a stack trace
+    // that is as complete as possible (even if it contains a few bogus
+    // entries in some rare cases).
+    void **next_sp = NextStackFrame<!IS_STACK_FRAMES>(sp);
+
+    if (skip_count > 0) {
+      skip_count--;
+    } else {
+      result[n] = *sp;
+
+      if (IS_STACK_FRAMES) {
+        if (next_sp > sp) {
+          sizes[n] = (uintptr_t)next_sp - (uintptr_t)sp;
+        } else {
+          // A frame-size of 0 is used to indicate unknown frame size.
+          sizes[n] = 0;
+        }
+      }
+      n++;
+    }
+    sp = next_sp;
+  }
+  if (min_dropped_frames != nullptr) {
+    // Implementation detail: we clamp the max of frames we are willing to
+    // count, so as not to spend too much time in the loop below.
+    const int kMaxUnwind = 200;
+    int j = 0;
+    for (; sp != nullptr && j < kMaxUnwind; j++) {
+      sp = NextStackFrame<!IS_STACK_FRAMES>(sp);
+    }
+    *min_dropped_frames = j;
+  }
+  return n;
+}
+
 namespace y_absl {
 ABSL_NAMESPACE_BEGIN
-namespace debugging_internal { 
-bool StackTraceWorksForTest() { 
-  return false; 
-} 
-}  // namespace debugging_internal 
+namespace debugging_internal {
+bool StackTraceWorksForTest() {
+  return false;
+}
+}  // namespace debugging_internal
 ABSL_NAMESPACE_END
 }  // namespace y_absl
- 
-#endif  // ABSL_DEBUGGING_INTERNAL_STACKTRACE_ARM_INL_H_ 
+
+#endif  // ABSL_DEBUGGING_INTERNAL_STACKTRACE_ARM_INL_H_
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/stacktrace_config.h b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/stacktrace_config.h
index 4553a77f8b..7ba212ab03 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/stacktrace_config.h
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/stacktrace_config.h
@@ -1,35 +1,35 @@
-/* 
- * Copyright 2017 The Abseil Authors. 
- * 
- * Licensed under the Apache License, Version 2.0 (the "License"); 
- * you may not use this file except in compliance with the License. 
- * You may obtain a copy of the License at 
- * 
- *      https://www.apache.org/licenses/LICENSE-2.0 
- * 
- * Unless required by applicable law or agreed to in writing, software 
- * distributed under the License is distributed on an "AS IS" BASIS, 
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
- * See the License for the specific language governing permissions and 
- * limitations under the License. 
- 
- * Defines ABSL_STACKTRACE_INL_HEADER to the *-inl.h containing 
- * actual unwinder implementation. 
- * This header is "private" to stacktrace.cc. 
- * DO NOT include it into any other files. 
-*/ 
-#ifndef ABSL_DEBUGGING_INTERNAL_STACKTRACE_CONFIG_H_ 
-#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_CONFIG_H_ 
- 
+/*
+ * Copyright 2017 The Abseil Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+
+ * Defines ABSL_STACKTRACE_INL_HEADER to the *-inl.h containing
+ * actual unwinder implementation.
+ * This header is "private" to stacktrace.cc.
+ * DO NOT include it into any other files.
+*/
+#ifndef ABSL_DEBUGGING_INTERNAL_STACKTRACE_CONFIG_H_
+#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_CONFIG_H_
+
 #include "y_absl/base/config.h"
 
-#if defined(ABSL_STACKTRACE_INL_HEADER) 
-#error ABSL_STACKTRACE_INL_HEADER cannot be directly set 
- 
-#elif defined(_WIN32) 
-#define ABSL_STACKTRACE_INL_HEADER \ 
+#if defined(ABSL_STACKTRACE_INL_HEADER)
+#error ABSL_STACKTRACE_INL_HEADER cannot be directly set
+
+#elif defined(_WIN32)
+#define ABSL_STACKTRACE_INL_HEADER \
     "y_absl/debugging/internal/stacktrace_win32-inl.inc"
- 
+
 #elif defined(__APPLE__)
 #ifdef ABSL_HAVE_THREAD_LOCAL
 // Thread local support required for UnwindImpl.
@@ -41,29 +41,29 @@
 #define ABSL_STACKTRACE_INL_HEADER \
   "y_absl/debugging/internal/stacktrace_emscripten-inl.inc"
 
-#elif defined(__linux__) && !defined(__ANDROID__) 
- 
+#elif defined(__linux__) && !defined(__ANDROID__)
+
 #if defined(NO_FRAME_POINTER) && \
     (defined(__i386__) || defined(__x86_64__) || defined(__aarch64__))
 // Note: The libunwind-based implementation is not available to open-source
 // users.
-#define ABSL_STACKTRACE_INL_HEADER \ 
+#define ABSL_STACKTRACE_INL_HEADER \
   "y_absl/debugging/internal/stacktrace_libunwind-inl.inc"
 #define STACKTRACE_USES_LIBUNWIND 1
 #elif defined(NO_FRAME_POINTER) && defined(__has_include)
 #if __has_include(<execinfo.h>)
-// Note: When using glibc this may require -funwind-tables to function properly. 
-#define ABSL_STACKTRACE_INL_HEADER \ 
+// Note: When using glibc this may require -funwind-tables to function properly.
+#define ABSL_STACKTRACE_INL_HEADER \
   "y_absl/debugging/internal/stacktrace_generic-inl.inc"
 #endif  // __has_include(<execinfo.h>)
 #elif defined(__i386__) || defined(__x86_64__)
-#define ABSL_STACKTRACE_INL_HEADER \ 
+#define ABSL_STACKTRACE_INL_HEADER \
   "y_absl/debugging/internal/stacktrace_x86-inl.inc"
 #elif defined(__ppc__) || defined(__PPC__)
-#define ABSL_STACKTRACE_INL_HEADER \ 
+#define ABSL_STACKTRACE_INL_HEADER \
   "y_absl/debugging/internal/stacktrace_powerpc-inl.inc"
 #elif defined(__aarch64__)
-#define ABSL_STACKTRACE_INL_HEADER \ 
+#define ABSL_STACKTRACE_INL_HEADER \
   "y_absl/debugging/internal/stacktrace_aarch64-inl.inc"
 #elif defined(__riscv)
 #define ABSL_STACKTRACE_INL_HEADER \
@@ -71,17 +71,17 @@
 #elif defined(__has_include)
 #if __has_include(<execinfo.h>)
 // Note: When using glibc this may require -funwind-tables to function properly.
-#define ABSL_STACKTRACE_INL_HEADER \ 
+#define ABSL_STACKTRACE_INL_HEADER \
   "y_absl/debugging/internal/stacktrace_generic-inl.inc"
 #endif  // __has_include(<execinfo.h>)
 #endif  // defined(__has_include)
- 
+
 #endif  // defined(__linux__) && !defined(__ANDROID__)
 
 // Fallback to the empty implementation.
 #if !defined(ABSL_STACKTRACE_INL_HEADER)
-#define ABSL_STACKTRACE_INL_HEADER \ 
+#define ABSL_STACKTRACE_INL_HEADER \
   "y_absl/debugging/internal/stacktrace_unimplemented-inl.inc"
-#endif 
- 
-#endif  // ABSL_DEBUGGING_INTERNAL_STACKTRACE_CONFIG_H_ 
+#endif
+
+#endif  // ABSL_DEBUGGING_INTERNAL_STACKTRACE_CONFIG_H_
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/stacktrace_generic-inl.inc b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/stacktrace_generic-inl.inc
index 7933cbdf3b..fa623aa954 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/stacktrace_generic-inl.inc
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/stacktrace_generic-inl.inc
@@ -1,9 +1,9 @@
 // Copyright 2017 The Abseil Authors.
-// 
+//
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
-// 
+//
 //      https://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
@@ -12,97 +12,97 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 //
-// Portable implementation - just use glibc 
-// 
-// Note:  The glibc implementation may cause a call to malloc. 
-// This can cause a deadlock in HeapProfiler. 
- 
-#ifndef ABSL_DEBUGGING_INTERNAL_STACKTRACE_GENERIC_INL_H_ 
-#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_GENERIC_INL_H_ 
- 
-#include <execinfo.h> 
-#include <atomic> 
-#include <cstring> 
- 
+// Portable implementation - just use glibc
+//
+// Note:  The glibc implementation may cause a call to malloc.
+// This can cause a deadlock in HeapProfiler.
+
+#ifndef ABSL_DEBUGGING_INTERNAL_STACKTRACE_GENERIC_INL_H_
+#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_GENERIC_INL_H_
+
+#include <execinfo.h>
+#include <atomic>
+#include <cstring>
+
 #include "y_absl/debugging/stacktrace.h"
 #include "y_absl/base/attributes.h"
- 
-// Sometimes, we can try to get a stack trace from within a stack 
-// trace, because we don't block signals inside this code (which would be too 
-// expensive: the two extra system calls per stack trace do matter here). 
-// That can cause a self-deadlock. 
-// Protect against such reentrant call by failing to get a stack trace. 
-// 
-// We use __thread here because the code here is extremely low level -- it is 
-// called while collecting stack traces from within malloc and mmap, and thus 
-// can not call anything which might call malloc or mmap itself. 
-static __thread int recursive = 0; 
- 
-// The stack trace function might be invoked very early in the program's 
-// execution (e.g. from the very first malloc if using tcmalloc). Also, the 
-// glibc implementation itself will trigger malloc the first time it is called. 
-// As such, we suppress usage of backtrace during this early stage of execution. 
-static std::atomic<bool> disable_stacktraces(true);  // Disabled until healthy. 
-// Waiting until static initializers run seems to be late enough. 
-// This file is included into stacktrace.cc so this will only run once. 
-ABSL_ATTRIBUTE_UNUSED static int stacktraces_enabler = []() { 
-  void* unused_stack[1]; 
-  // Force the first backtrace to happen early to get the one-time shared lib 
-  // loading (allocation) out of the way. After the first call it is much safer 
-  // to use backtrace from a signal handler if we crash somewhere later. 
-  backtrace(unused_stack, 1); 
-  disable_stacktraces.store(false, std::memory_order_relaxed); 
-  return 0; 
-}(); 
- 
-template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT> 
-static int UnwindImpl(void** result, int* sizes, int max_depth, int skip_count, 
-                      const void *ucp, int *min_dropped_frames) { 
-  if (recursive || disable_stacktraces.load(std::memory_order_relaxed)) { 
-    return 0; 
-  } 
-  ++recursive; 
- 
-  static_cast<void>(ucp);  // Unused. 
-  static const int kStackLength = 64; 
-  void * stack[kStackLength]; 
-  int size; 
- 
-  size = backtrace(stack, kStackLength); 
-  skip_count++;  // we want to skip the current frame as well 
-  int result_count = size - skip_count; 
-  if (result_count < 0) 
-    result_count = 0; 
-  if (result_count > max_depth) 
-    result_count = max_depth; 
-  for (int i = 0; i < result_count; i++) 
-    result[i] = stack[i + skip_count]; 
- 
-  if (IS_STACK_FRAMES) { 
-    // No implementation for finding out the stack frame sizes yet. 
-    memset(sizes, 0, sizeof(*sizes) * result_count); 
-  } 
-  if (min_dropped_frames != nullptr) { 
-    if (size - skip_count - max_depth > 0) { 
-      *min_dropped_frames = size - skip_count - max_depth; 
-    } else { 
-      *min_dropped_frames = 0; 
-    } 
-  } 
- 
-  --recursive; 
- 
-  return result_count; 
-} 
- 
+
+// Sometimes, we can try to get a stack trace from within a stack
+// trace, because we don't block signals inside this code (which would be too
+// expensive: the two extra system calls per stack trace do matter here).
+// That can cause a self-deadlock.
+// Protect against such reentrant call by failing to get a stack trace.
+//
+// We use __thread here because the code here is extremely low level -- it is
+// called while collecting stack traces from within malloc and mmap, and thus
+// can not call anything which might call malloc or mmap itself.
+static __thread int recursive = 0;
+
+// The stack trace function might be invoked very early in the program's
+// execution (e.g. from the very first malloc if using tcmalloc). Also, the
+// glibc implementation itself will trigger malloc the first time it is called.
+// As such, we suppress usage of backtrace during this early stage of execution.
+static std::atomic<bool> disable_stacktraces(true);  // Disabled until healthy.
+// Waiting until static initializers run seems to be late enough.
+// This file is included into stacktrace.cc so this will only run once.
+ABSL_ATTRIBUTE_UNUSED static int stacktraces_enabler = []() {
+  void* unused_stack[1];
+  // Force the first backtrace to happen early to get the one-time shared lib
+  // loading (allocation) out of the way. After the first call it is much safer
+  // to use backtrace from a signal handler if we crash somewhere later.
+  backtrace(unused_stack, 1);
+  disable_stacktraces.store(false, std::memory_order_relaxed);
+  return 0;
+}();
+
+template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT>
+static int UnwindImpl(void** result, int* sizes, int max_depth, int skip_count,
+                      const void *ucp, int *min_dropped_frames) {
+  if (recursive || disable_stacktraces.load(std::memory_order_relaxed)) {
+    return 0;
+  }
+  ++recursive;
+
+  static_cast<void>(ucp);  // Unused.
+  static const int kStackLength = 64;
+  void * stack[kStackLength];
+  int size;
+
+  size = backtrace(stack, kStackLength);
+  skip_count++;  // we want to skip the current frame as well
+  int result_count = size - skip_count;
+  if (result_count < 0)
+    result_count = 0;
+  if (result_count > max_depth)
+    result_count = max_depth;
+  for (int i = 0; i < result_count; i++)
+    result[i] = stack[i + skip_count];
+
+  if (IS_STACK_FRAMES) {
+    // No implementation for finding out the stack frame sizes yet.
+    memset(sizes, 0, sizeof(*sizes) * result_count);
+  }
+  if (min_dropped_frames != nullptr) {
+    if (size - skip_count - max_depth > 0) {
+      *min_dropped_frames = size - skip_count - max_depth;
+    } else {
+      *min_dropped_frames = 0;
+    }
+  }
+
+  --recursive;
+
+  return result_count;
+}
+
 namespace y_absl {
 ABSL_NAMESPACE_BEGIN
-namespace debugging_internal { 
-bool StackTraceWorksForTest() { 
-  return true; 
-} 
-}  // namespace debugging_internal 
+namespace debugging_internal {
+bool StackTraceWorksForTest() {
+  return true;
+}
+}  // namespace debugging_internal
 ABSL_NAMESPACE_END
 }  // namespace y_absl
- 
-#endif  // ABSL_DEBUGGING_INTERNAL_STACKTRACE_GENERIC_INL_H_ 
+
+#endif  // ABSL_DEBUGGING_INTERNAL_STACKTRACE_GENERIC_INL_H_
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/stacktrace_powerpc-inl.inc b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/stacktrace_powerpc-inl.inc
index 0c16625070..1e41c4ebf2 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/stacktrace_powerpc-inl.inc
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/stacktrace_powerpc-inl.inc
@@ -1,253 +1,253 @@
-// Copyright 2017 The Abseil Authors. 
-// 
-// Licensed under the Apache License, Version 2.0 (the "License"); 
-// you may not use this file except in compliance with the License. 
-// You may obtain a copy of the License at 
-// 
-//      https://www.apache.org/licenses/LICENSE-2.0 
-// 
-// Unless required by applicable law or agreed to in writing, software 
-// distributed under the License is distributed on an "AS IS" BASIS, 
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
-// See the License for the specific language governing permissions and 
-// limitations under the License. 
-// 
-// Produce stack trace.  I'm guessing (hoping!) the code is much like 
-// for x86.  For apple machines, at least, it seems to be; see 
-//    https://developer.apple.com/documentation/mac/runtimehtml/RTArch-59.html 
-//    https://www.linux-foundation.org/spec/ELF/ppc64/PPC-elf64abi-1.9.html#STACK 
-// Linux has similar code: http://patchwork.ozlabs.org/linuxppc/patch?id=8882 
- 
-#ifndef ABSL_DEBUGGING_INTERNAL_STACKTRACE_POWERPC_INL_H_ 
-#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_POWERPC_INL_H_ 
- 
-#if defined(__linux__) 
-#include <asm/ptrace.h>   // for PT_NIP. 
-#include <ucontext.h>     // for ucontext_t 
-#endif 
- 
-#include <unistd.h> 
-#include <cassert> 
-#include <cstdint> 
-#include <cstdio> 
- 
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Produce stack trace.  I'm guessing (hoping!) the code is much like
+// for x86.  For apple machines, at least, it seems to be; see
+//    https://developer.apple.com/documentation/mac/runtimehtml/RTArch-59.html
+//    https://www.linux-foundation.org/spec/ELF/ppc64/PPC-elf64abi-1.9.html#STACK
+// Linux has similar code: http://patchwork.ozlabs.org/linuxppc/patch?id=8882
+
+#ifndef ABSL_DEBUGGING_INTERNAL_STACKTRACE_POWERPC_INL_H_
+#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_POWERPC_INL_H_
+
+#if defined(__linux__)
+#include <asm/ptrace.h>   // for PT_NIP.
+#include <ucontext.h>     // for ucontext_t
+#endif
+
+#include <unistd.h>
+#include <cassert>
+#include <cstdint>
+#include <cstdio>
+
 #include "y_absl/base/attributes.h"
 #include "y_absl/base/optimization.h"
 #include "y_absl/base/port.h"
 #include "y_absl/debugging/stacktrace.h"
 #include "y_absl/debugging/internal/address_is_readable.h"
 #include "y_absl/debugging/internal/vdso_support.h"  // a no-op on non-elf or non-glibc systems
- 
-// Given a stack pointer, return the saved link register value. 
-// Note that this is the link register for a callee. 
-static inline void *StacktracePowerPCGetLR(void **sp) { 
-  // PowerPC has 3 main ABIs, which say where in the stack the 
-  // Link Register is.  For DARWIN and AIX (used by apple and 
-  // linux ppc64), it's in sp[2].  For SYSV (used by linux ppc), 
-  // it's in sp[1]. 
-#if defined(_CALL_AIX) || defined(_CALL_DARWIN) 
-  return *(sp+2); 
-#elif defined(_CALL_SYSV) 
-  return *(sp+1); 
-#elif defined(__APPLE__) || defined(__FreeBSD__) || \ 
-    (defined(__linux__) && defined(__PPC64__)) 
-  // This check is in case the compiler doesn't define _CALL_AIX/etc. 
-  return *(sp+2); 
-#elif defined(__linux) 
-  // This check is in case the compiler doesn't define _CALL_SYSV. 
-  return *(sp+1); 
-#else 
-#error Need to specify the PPC ABI for your archiecture. 
-#endif 
-} 
- 
-// Given a pointer to a stack frame, locate and return the calling 
-// stackframe, or return null if no stackframe can be found. Perform sanity 
-// checks (the strictness of which is controlled by the boolean parameter 
-// "STRICT_UNWINDING") to reduce the chance that a bad pointer is returned. 
-template<bool STRICT_UNWINDING, bool IS_WITH_CONTEXT> 
-ABSL_ATTRIBUTE_NO_SANITIZE_ADDRESS  // May read random elements from stack. 
-ABSL_ATTRIBUTE_NO_SANITIZE_MEMORY   // May read random elements from stack. 
-static void **NextStackFrame(void **old_sp, const void *uc) { 
-  void **new_sp = (void **) *old_sp; 
-  enum { kStackAlignment = 16 }; 
- 
-  // Check that the transition from frame pointer old_sp to frame 
-  // pointer new_sp isn't clearly bogus 
-  if (STRICT_UNWINDING) { 
-    // With the stack growing downwards, older stack frame must be 
-    // at a greater address that the current one. 
-    if (new_sp <= old_sp) return nullptr; 
-    // Assume stack frames larger than 100,000 bytes are bogus. 
-    if ((uintptr_t)new_sp - (uintptr_t)old_sp > 100000) return nullptr; 
-  } else { 
-    // In the non-strict mode, allow discontiguous stack frames. 
-    // (alternate-signal-stacks for example). 
-    if (new_sp == old_sp) return nullptr; 
-    // And allow frames upto about 1MB. 
-    if ((new_sp > old_sp) 
-        && ((uintptr_t)new_sp - (uintptr_t)old_sp > 1000000)) return nullptr; 
-  } 
-  if ((uintptr_t)new_sp % kStackAlignment != 0) return nullptr; 
- 
-#if defined(__linux__) 
-  enum StackTraceKernelSymbolStatus { 
-      kNotInitialized = 0, kAddressValid, kAddressInvalid }; 
- 
-  if (IS_WITH_CONTEXT && uc != nullptr) { 
-    static StackTraceKernelSymbolStatus kernel_symbol_status = 
-        kNotInitialized;  // Sentinel: not computed yet. 
-    // Initialize with sentinel value: __kernel_rt_sigtramp_rt64 can not 
-    // possibly be there. 
-    static const unsigned char *kernel_sigtramp_rt64_address = nullptr; 
-    if (kernel_symbol_status == kNotInitialized) { 
+
+// Given a stack pointer, return the saved link register value.
+// Note that this is the link register for a callee.
+static inline void *StacktracePowerPCGetLR(void **sp) {
+  // PowerPC has 3 main ABIs, which say where in the stack the
+  // Link Register is.  For DARWIN and AIX (used by apple and
+  // linux ppc64), it's in sp[2].  For SYSV (used by linux ppc),
+  // it's in sp[1].
+#if defined(_CALL_AIX) || defined(_CALL_DARWIN)
+  return *(sp+2);
+#elif defined(_CALL_SYSV)
+  return *(sp+1);
+#elif defined(__APPLE__) || defined(__FreeBSD__) || \
+    (defined(__linux__) && defined(__PPC64__))
+  // This check is in case the compiler doesn't define _CALL_AIX/etc.
+  return *(sp+2);
+#elif defined(__linux)
+  // This check is in case the compiler doesn't define _CALL_SYSV.
+  return *(sp+1);
+#else
+#error Need to specify the PPC ABI for your archiecture.
+#endif
+}
+
+// Given a pointer to a stack frame, locate and return the calling
+// stackframe, or return null if no stackframe can be found. Perform sanity
+// checks (the strictness of which is controlled by the boolean parameter
+// "STRICT_UNWINDING") to reduce the chance that a bad pointer is returned.
+template<bool STRICT_UNWINDING, bool IS_WITH_CONTEXT>
+ABSL_ATTRIBUTE_NO_SANITIZE_ADDRESS  // May read random elements from stack.
+ABSL_ATTRIBUTE_NO_SANITIZE_MEMORY   // May read random elements from stack.
+static void **NextStackFrame(void **old_sp, const void *uc) {
+  void **new_sp = (void **) *old_sp;
+  enum { kStackAlignment = 16 };
+
+  // Check that the transition from frame pointer old_sp to frame
+  // pointer new_sp isn't clearly bogus
+  if (STRICT_UNWINDING) {
+    // With the stack growing downwards, older stack frame must be
+    // at a greater address that the current one.
+    if (new_sp <= old_sp) return nullptr;
+    // Assume stack frames larger than 100,000 bytes are bogus.
+    if ((uintptr_t)new_sp - (uintptr_t)old_sp > 100000) return nullptr;
+  } else {
+    // In the non-strict mode, allow discontiguous stack frames.
+    // (alternate-signal-stacks for example).
+    if (new_sp == old_sp) return nullptr;
+    // And allow frames upto about 1MB.
+    if ((new_sp > old_sp)
+        && ((uintptr_t)new_sp - (uintptr_t)old_sp > 1000000)) return nullptr;
+  }
+  if ((uintptr_t)new_sp % kStackAlignment != 0) return nullptr;
+
+#if defined(__linux__)
+  enum StackTraceKernelSymbolStatus {
+      kNotInitialized = 0, kAddressValid, kAddressInvalid };
+
+  if (IS_WITH_CONTEXT && uc != nullptr) {
+    static StackTraceKernelSymbolStatus kernel_symbol_status =
+        kNotInitialized;  // Sentinel: not computed yet.
+    // Initialize with sentinel value: __kernel_rt_sigtramp_rt64 can not
+    // possibly be there.
+    static const unsigned char *kernel_sigtramp_rt64_address = nullptr;
+    if (kernel_symbol_status == kNotInitialized) {
       y_absl::debugging_internal::VDSOSupport vdso;
-      if (vdso.IsPresent()) { 
+      if (vdso.IsPresent()) {
         y_absl::debugging_internal::VDSOSupport::SymbolInfo
-            sigtramp_rt64_symbol_info; 
-        if (!vdso.LookupSymbol( 
-                "__kernel_sigtramp_rt64", "LINUX_2.6.15", 
+            sigtramp_rt64_symbol_info;
+        if (!vdso.LookupSymbol(
+                "__kernel_sigtramp_rt64", "LINUX_2.6.15",
                 y_absl::debugging_internal::VDSOSupport::kVDSOSymbolType,
-                &sigtramp_rt64_symbol_info) || 
-            sigtramp_rt64_symbol_info.address == nullptr) { 
-          // Unexpected: VDSO is present, yet the expected symbol is missing 
-          // or null. 
-          assert(false && "VDSO is present, but doesn't have expected symbol"); 
-          kernel_symbol_status = kAddressInvalid; 
-        } else { 
-          kernel_sigtramp_rt64_address = 
-              reinterpret_cast<const unsigned char *>( 
-                  sigtramp_rt64_symbol_info.address); 
-          kernel_symbol_status = kAddressValid; 
-        } 
-      } else { 
-        kernel_symbol_status = kAddressInvalid; 
-      } 
-    } 
- 
-    if (new_sp != nullptr && 
-        kernel_symbol_status == kAddressValid && 
-        StacktracePowerPCGetLR(new_sp) == kernel_sigtramp_rt64_address) { 
-      const ucontext_t* signal_context = 
-          reinterpret_cast<const ucontext_t*>(uc); 
-      void **const sp_before_signal = 
+                &sigtramp_rt64_symbol_info) ||
+            sigtramp_rt64_symbol_info.address == nullptr) {
+          // Unexpected: VDSO is present, yet the expected symbol is missing
+          // or null.
+          assert(false && "VDSO is present, but doesn't have expected symbol");
+          kernel_symbol_status = kAddressInvalid;
+        } else {
+          kernel_sigtramp_rt64_address =
+              reinterpret_cast<const unsigned char *>(
+                  sigtramp_rt64_symbol_info.address);
+          kernel_symbol_status = kAddressValid;
+        }
+      } else {
+        kernel_symbol_status = kAddressInvalid;
+      }
+    }
+
+    if (new_sp != nullptr &&
+        kernel_symbol_status == kAddressValid &&
+        StacktracePowerPCGetLR(new_sp) == kernel_sigtramp_rt64_address) {
+      const ucontext_t* signal_context =
+          reinterpret_cast<const ucontext_t*>(uc);
+      void **const sp_before_signal =
 #if defined(__PPC64__)
           reinterpret_cast<void **>(signal_context->uc_mcontext.gp_regs[PT_R1]);
 #else
           reinterpret_cast<void **>(
               signal_context->uc_mcontext.uc_regs->gregs[PT_R1]);
 #endif
-      // Check that alleged sp before signal is nonnull and is reasonably 
-      // aligned. 
-      if (sp_before_signal != nullptr && 
-          ((uintptr_t)sp_before_signal % kStackAlignment) == 0) { 
-        // Check that alleged stack pointer is actually readable. This is to 
-        // prevent a "double fault" in case we hit the first fault due to e.g. 
-        // a stack corruption. 
+      // Check that alleged sp before signal is nonnull and is reasonably
+      // aligned.
+      if (sp_before_signal != nullptr &&
+          ((uintptr_t)sp_before_signal % kStackAlignment) == 0) {
+        // Check that alleged stack pointer is actually readable. This is to
+        // prevent a "double fault" in case we hit the first fault due to e.g.
+        // a stack corruption.
         if (y_absl::debugging_internal::AddressIsReadable(sp_before_signal)) {
-          // Alleged stack pointer is readable, use it for further unwinding. 
-          new_sp = sp_before_signal; 
-        } 
-      } 
-    } 
-  } 
-#endif 
- 
-  return new_sp; 
-} 
- 
+          // Alleged stack pointer is readable, use it for further unwinding.
+          new_sp = sp_before_signal;
+        }
+      }
+    }
+  }
+#endif
+
+  return new_sp;
+}
+
 // This ensures that y_absl::GetStackTrace sets up the Link Register properly.
-ABSL_ATTRIBUTE_NOINLINE static void AbslStacktracePowerPCDummyFunction() { 
-  ABSL_BLOCK_TAIL_CALL_OPTIMIZATION(); 
-} 
- 
-template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT> 
-ABSL_ATTRIBUTE_NO_SANITIZE_ADDRESS  // May read random elements from stack. 
-ABSL_ATTRIBUTE_NO_SANITIZE_MEMORY   // May read random elements from stack. 
-static int UnwindImpl(void** result, int* sizes, int max_depth, int skip_count, 
-                      const void *ucp, int *min_dropped_frames) { 
-  void **sp; 
-  // Apple macOS uses an old version of gnu as -- both Darwin 7.9.0 (Panther) 
-  // and Darwin 8.8.1 (Tiger) use as 1.38.  This means we have to use a 
-  // different asm syntax.  I don't know quite the best way to discriminate 
-  // systems using the old as from the new one; I've gone with __APPLE__. 
-#ifdef __APPLE__ 
-  __asm__ volatile ("mr %0,r1" : "=r" (sp)); 
-#else 
-  __asm__ volatile ("mr %0,1" : "=r" (sp)); 
-#endif 
- 
-  // On PowerPC, the "Link Register" or "Link Record" (LR), is a stack 
-  // entry that holds the return address of the subroutine call (what 
-  // instruction we run after our function finishes).  This is the 
-  // same as the stack-pointer of our parent routine, which is what we 
-  // want here.  While the compiler will always(?) set up LR for 
-  // subroutine calls, it may not for leaf functions (such as this one). 
-  // This routine forces the compiler (at least gcc) to push it anyway. 
-  AbslStacktracePowerPCDummyFunction(); 
- 
-  // The LR save area is used by the callee, so the top entry is bogus. 
-  skip_count++; 
- 
-  int n = 0; 
- 
-  // Unlike ABIs of X86 and ARM, PowerPC ABIs say that return address (in 
-  // the link register) of a function call is stored in the caller's stack 
-  // frame instead of the callee's.  When we look for the return address 
-  // associated with a stack frame, we need to make sure that there is a 
-  // caller frame before it.  So we call NextStackFrame before entering the 
-  // loop below and check next_sp instead of sp for loop termination. 
-  // The outermost frame is set up by runtimes and it does not have a 
-  // caller frame, so it is skipped. 
- 
+ABSL_ATTRIBUTE_NOINLINE static void AbslStacktracePowerPCDummyFunction() {
+  ABSL_BLOCK_TAIL_CALL_OPTIMIZATION();
+}
+
+template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT>
+ABSL_ATTRIBUTE_NO_SANITIZE_ADDRESS  // May read random elements from stack.
+ABSL_ATTRIBUTE_NO_SANITIZE_MEMORY   // May read random elements from stack.
+static int UnwindImpl(void** result, int* sizes, int max_depth, int skip_count,
+                      const void *ucp, int *min_dropped_frames) {
+  void **sp;
+  // Apple macOS uses an old version of gnu as -- both Darwin 7.9.0 (Panther)
+  // and Darwin 8.8.1 (Tiger) use as 1.38.  This means we have to use a
+  // different asm syntax.  I don't know quite the best way to discriminate
+  // systems using the old as from the new one; I've gone with __APPLE__.
+#ifdef __APPLE__
+  __asm__ volatile ("mr %0,r1" : "=r" (sp));
+#else
+  __asm__ volatile ("mr %0,1" : "=r" (sp));
+#endif
+
+  // On PowerPC, the "Link Register" or "Link Record" (LR), is a stack
+  // entry that holds the return address of the subroutine call (what
+  // instruction we run after our function finishes).  This is the
+  // same as the stack-pointer of our parent routine, which is what we
+  // want here.  While the compiler will always(?) set up LR for
+  // subroutine calls, it may not for leaf functions (such as this one).
+  // This routine forces the compiler (at least gcc) to push it anyway.
+  AbslStacktracePowerPCDummyFunction();
+
+  // The LR save area is used by the callee, so the top entry is bogus.
+  skip_count++;
+
+  int n = 0;
+
+  // Unlike ABIs of X86 and ARM, PowerPC ABIs say that return address (in
+  // the link register) of a function call is stored in the caller's stack
+  // frame instead of the callee's.  When we look for the return address
+  // associated with a stack frame, we need to make sure that there is a
+  // caller frame before it.  So we call NextStackFrame before entering the
+  // loop below and check next_sp instead of sp for loop termination.
+  // The outermost frame is set up by runtimes and it does not have a
+  // caller frame, so it is skipped.
+
   // The y_absl::GetStackFrames routine is called when we are in some
-  // informational context (the failure signal handler for example). 
-  // Use the non-strict unwinding rules to produce a stack trace 
-  // that is as complete as possible (even if it contains a few 
-  // bogus entries in some rare cases). 
-  void **next_sp = NextStackFrame<!IS_STACK_FRAMES, IS_WITH_CONTEXT>(sp, ucp); 
- 
-  while (next_sp && n < max_depth) { 
-    if (skip_count > 0) { 
-      skip_count--; 
-    } else { 
-      result[n] = StacktracePowerPCGetLR(sp); 
-      if (IS_STACK_FRAMES) { 
-        if (next_sp > sp) { 
-          sizes[n] = (uintptr_t)next_sp - (uintptr_t)sp; 
-        } else { 
-          // A frame-size of 0 is used to indicate unknown frame size. 
-          sizes[n] = 0; 
-        } 
-      } 
-      n++; 
-    } 
- 
-    sp = next_sp; 
-    next_sp = NextStackFrame<!IS_STACK_FRAMES, IS_WITH_CONTEXT>(sp, ucp); 
-  } 
- 
-  if (min_dropped_frames != nullptr) { 
-    // Implementation detail: we clamp the max of frames we are willing to 
-    // count, so as not to spend too much time in the loop below. 
-    const int kMaxUnwind = 1000; 
-    int j = 0; 
-    for (; next_sp != nullptr && j < kMaxUnwind; j++) { 
-      next_sp = NextStackFrame<!IS_STACK_FRAMES, IS_WITH_CONTEXT>(next_sp, ucp); 
-    } 
-    *min_dropped_frames = j; 
-  } 
-  return n; 
-} 
- 
+  // informational context (the failure signal handler for example).
+  // Use the non-strict unwinding rules to produce a stack trace
+  // that is as complete as possible (even if it contains a few
+  // bogus entries in some rare cases).
+  void **next_sp = NextStackFrame<!IS_STACK_FRAMES, IS_WITH_CONTEXT>(sp, ucp);
+
+  while (next_sp && n < max_depth) {
+    if (skip_count > 0) {
+      skip_count--;
+    } else {
+      result[n] = StacktracePowerPCGetLR(sp);
+      if (IS_STACK_FRAMES) {
+        if (next_sp > sp) {
+          sizes[n] = (uintptr_t)next_sp - (uintptr_t)sp;
+        } else {
+          // A frame-size of 0 is used to indicate unknown frame size.
+          sizes[n] = 0;
+        }
+      }
+      n++;
+    }
+
+    sp = next_sp;
+    next_sp = NextStackFrame<!IS_STACK_FRAMES, IS_WITH_CONTEXT>(sp, ucp);
+  }
+
+  if (min_dropped_frames != nullptr) {
+    // Implementation detail: we clamp the max of frames we are willing to
+    // count, so as not to spend too much time in the loop below.
+    const int kMaxUnwind = 1000;
+    int j = 0;
+    for (; next_sp != nullptr && j < kMaxUnwind; j++) {
+      next_sp = NextStackFrame<!IS_STACK_FRAMES, IS_WITH_CONTEXT>(next_sp, ucp);
+    }
+    *min_dropped_frames = j;
+  }
+  return n;
+}
+
 namespace y_absl {
 ABSL_NAMESPACE_BEGIN
-namespace debugging_internal { 
-bool StackTraceWorksForTest() { 
-  return true; 
-} 
-}  // namespace debugging_internal 
+namespace debugging_internal {
+bool StackTraceWorksForTest() {
+  return true;
+}
+}  // namespace debugging_internal
 ABSL_NAMESPACE_END
 }  // namespace y_absl
- 
-#endif  // ABSL_DEBUGGING_INTERNAL_STACKTRACE_POWERPC_INL_H_ 
+
+#endif  // ABSL_DEBUGGING_INTERNAL_STACKTRACE_POWERPC_INL_H_
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/stacktrace_unimplemented-inl.inc b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/stacktrace_unimplemented-inl.inc
index cfdfb6fbdd..54dccaeae9 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/stacktrace_unimplemented-inl.inc
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/stacktrace_unimplemented-inl.inc
@@ -1,24 +1,24 @@
-#ifndef ABSL_DEBUGGING_INTERNAL_STACKTRACE_UNIMPLEMENTED_INL_H_ 
-#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_UNIMPLEMENTED_INL_H_ 
- 
-template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT> 
-static int UnwindImpl(void** /* result */, int* /* sizes */, 
-                      int /* max_depth */, int /* skip_count */, 
-                      const void* /* ucp */, int *min_dropped_frames) { 
-  if (min_dropped_frames != nullptr) { 
-    *min_dropped_frames = 0; 
-  } 
-  return 0; 
-} 
- 
+#ifndef ABSL_DEBUGGING_INTERNAL_STACKTRACE_UNIMPLEMENTED_INL_H_
+#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_UNIMPLEMENTED_INL_H_
+
+template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT>
+static int UnwindImpl(void** /* result */, int* /* sizes */,
+                      int /* max_depth */, int /* skip_count */,
+                      const void* /* ucp */, int *min_dropped_frames) {
+  if (min_dropped_frames != nullptr) {
+    *min_dropped_frames = 0;
+  }
+  return 0;
+}
+
 namespace y_absl {
 ABSL_NAMESPACE_BEGIN
-namespace debugging_internal { 
-bool StackTraceWorksForTest() { 
-  return false; 
-} 
-}  // namespace debugging_internal 
+namespace debugging_internal {
+bool StackTraceWorksForTest() {
+  return false;
+}
+}  // namespace debugging_internal
 ABSL_NAMESPACE_END
 }  // namespace y_absl
- 
-#endif  // ABSL_DEBUGGING_INTERNAL_STACKTRACE_UNIMPLEMENTED_INL_H_ 
+
+#endif  // ABSL_DEBUGGING_INTERNAL_STACKTRACE_UNIMPLEMENTED_INL_H_
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/stacktrace_win32-inl.inc b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/stacktrace_win32-inl.inc
index a9ed6410f3..69bd7e3f2f 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/stacktrace_win32-inl.inc
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/stacktrace_win32-inl.inc
@@ -1,51 +1,51 @@
-// Copyright 2017 The Abseil Authors. 
-// 
-// Licensed under the Apache License, Version 2.0 (the "License"); 
-// you may not use this file except in compliance with the License. 
-// You may obtain a copy of the License at 
-// 
-//      https://www.apache.org/licenses/LICENSE-2.0 
-// 
-// Unless required by applicable law or agreed to in writing, software 
-// distributed under the License is distributed on an "AS IS" BASIS, 
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
-// See the License for the specific language governing permissions and 
-// limitations under the License. 
-// 
-// Produces a stack trace for Windows.  Normally, one could use 
-// stacktrace_x86-inl.h or stacktrace_x86_64-inl.h -- and indeed, that 
-// should work for binaries compiled using MSVC in "debug" mode. 
-// However, in "release" mode, Windows uses frame-pointer 
-// optimization, which makes getting a stack trace very difficult. 
-// 
-// There are several approaches one can take.  One is to use Windows 
-// intrinsics like StackWalk64.  These can work, but have restrictions 
-// on how successful they can be.  Another attempt is to write a 
-// version of stacktrace_x86-inl.h that has heuristic support for 
-// dealing with FPO, similar to what WinDbg does (see 
-// http://www.nynaeve.net/?p=97).  There are (non-working) examples of 
-// these approaches, complete with TODOs, in stacktrace_win32-inl.h#1 
-// 
-// The solution we've ended up doing is to call the undocumented 
-// windows function RtlCaptureStackBackTrace, which probably doesn't 
-// work with FPO but at least is fast, and doesn't require a symbol 
-// server. 
-// 
-// This code is inspired by a patch from David Vitek: 
-//   https://code.google.com/p/google-perftools/issues/detail?id=83 
- 
-#ifndef ABSL_DEBUGGING_INTERNAL_STACKTRACE_WIN32_INL_H_ 
-#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_WIN32_INL_H_ 
- 
-#include <windows.h>    // for GetProcAddress and GetModuleHandle 
-#include <cassert> 
- 
-typedef USHORT NTAPI RtlCaptureStackBackTrace_Function( 
-    IN ULONG frames_to_skip, 
-    IN ULONG frames_to_capture, 
-    OUT PVOID *backtrace, 
-    OUT PULONG backtrace_hash); 
- 
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Produces a stack trace for Windows.  Normally, one could use
+// stacktrace_x86-inl.h or stacktrace_x86_64-inl.h -- and indeed, that
+// should work for binaries compiled using MSVC in "debug" mode.
+// However, in "release" mode, Windows uses frame-pointer
+// optimization, which makes getting a stack trace very difficult.
+//
+// There are several approaches one can take.  One is to use Windows
+// intrinsics like StackWalk64.  These can work, but have restrictions
+// on how successful they can be.  Another attempt is to write a
+// version of stacktrace_x86-inl.h that has heuristic support for
+// dealing with FPO, similar to what WinDbg does (see
+// http://www.nynaeve.net/?p=97).  There are (non-working) examples of
+// these approaches, complete with TODOs, in stacktrace_win32-inl.h#1
+//
+// The solution we've ended up doing is to call the undocumented
+// windows function RtlCaptureStackBackTrace, which probably doesn't
+// work with FPO but at least is fast, and doesn't require a symbol
+// server.
+//
+// This code is inspired by a patch from David Vitek:
+//   https://code.google.com/p/google-perftools/issues/detail?id=83
+
+#ifndef ABSL_DEBUGGING_INTERNAL_STACKTRACE_WIN32_INL_H_
+#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_WIN32_INL_H_
+
+#include <windows.h>    // for GetProcAddress and GetModuleHandle
+#include <cassert>
+
+typedef USHORT NTAPI RtlCaptureStackBackTrace_Function(
+    IN ULONG frames_to_skip,
+    IN ULONG frames_to_capture,
+    OUT PVOID *backtrace,
+    OUT PULONG backtrace_hash);
+
 // It is not possible to load RtlCaptureStackBackTrace at static init time in
 // UWP. CaptureStackBackTrace is the public version of RtlCaptureStackBackTrace
 #if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP) && \
@@ -53,41 +53,41 @@ typedef USHORT NTAPI RtlCaptureStackBackTrace_Function(
 static RtlCaptureStackBackTrace_Function* const RtlCaptureStackBackTrace_fn =
     &::CaptureStackBackTrace;
 #else
-// Load the function we need at static init time, where we don't have 
-// to worry about someone else holding the loader's lock. 
-static RtlCaptureStackBackTrace_Function* const RtlCaptureStackBackTrace_fn = 
+// Load the function we need at static init time, where we don't have
+// to worry about someone else holding the loader's lock.
+static RtlCaptureStackBackTrace_Function* const RtlCaptureStackBackTrace_fn =
     (RtlCaptureStackBackTrace_Function*)GetProcAddress(
         GetModuleHandleA("ntdll.dll"), "RtlCaptureStackBackTrace");
 #endif  // WINAPI_PARTITION_APP && !WINAPI_PARTITION_DESKTOP
- 
-template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT> 
-static int UnwindImpl(void** result, int* sizes, int max_depth, int skip_count, 
-                      const void*, int* min_dropped_frames) { 
-  int n = 0; 
-  if (!RtlCaptureStackBackTrace_fn) { 
-    // can't find a stacktrace with no function to call 
-  } else { 
-    n = (int)RtlCaptureStackBackTrace_fn(skip_count + 2, max_depth, result, 0); 
-  } 
-  if (IS_STACK_FRAMES) { 
-    // No implementation for finding out the stack frame sizes yet. 
-    memset(sizes, 0, sizeof(*sizes) * n); 
-  } 
-  if (min_dropped_frames != nullptr) { 
-    // Not implemented. 
-    *min_dropped_frames = 0; 
-  } 
-  return n; 
-} 
- 
+
+template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT>
+static int UnwindImpl(void** result, int* sizes, int max_depth, int skip_count,
+                      const void*, int* min_dropped_frames) {
+  int n = 0;
+  if (!RtlCaptureStackBackTrace_fn) {
+    // can't find a stacktrace with no function to call
+  } else {
+    n = (int)RtlCaptureStackBackTrace_fn(skip_count + 2, max_depth, result, 0);
+  }
+  if (IS_STACK_FRAMES) {
+    // No implementation for finding out the stack frame sizes yet.
+    memset(sizes, 0, sizeof(*sizes) * n);
+  }
+  if (min_dropped_frames != nullptr) {
+    // Not implemented.
+    *min_dropped_frames = 0;
+  }
+  return n;
+}
+
 namespace y_absl {
 ABSL_NAMESPACE_BEGIN
-namespace debugging_internal { 
-bool StackTraceWorksForTest() { 
-  return false; 
-} 
-}  // namespace debugging_internal 
+namespace debugging_internal {
+bool StackTraceWorksForTest() {
+  return false;
+}
+}  // namespace debugging_internal
 ABSL_NAMESPACE_END
 }  // namespace y_absl
- 
-#endif  // ABSL_DEBUGGING_INTERNAL_STACKTRACE_WIN32_INL_H_ 
+
+#endif  // ABSL_DEBUGGING_INTERNAL_STACKTRACE_WIN32_INL_H_
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/stacktrace_x86-inl.inc b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/stacktrace_x86-inl.inc
index b0f9a9c5c8..8936f8ca70 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/stacktrace_x86-inl.inc
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/stacktrace_x86-inl.inc
@@ -1,264 +1,264 @@
-// Copyright 2017 The Abseil Authors. 
-// 
-// Licensed under the Apache License, Version 2.0 (the "License"); 
-// you may not use this file except in compliance with the License. 
-// You may obtain a copy of the License at 
-// 
-//      https://www.apache.org/licenses/LICENSE-2.0 
-// 
-// Unless required by applicable law or agreed to in writing, software 
-// distributed under the License is distributed on an "AS IS" BASIS, 
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
-// See the License for the specific language governing permissions and 
-// limitations under the License. 
-// 
-// Produce stack trace 
- 
-#ifndef ABSL_DEBUGGING_INTERNAL_STACKTRACE_X86_INL_INC_ 
-#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_X86_INL_INC_ 
- 
-#if defined(__linux__) && (defined(__i386__) || defined(__x86_64__)) 
-#include <ucontext.h>  // for ucontext_t 
-#endif 
- 
-#if !defined(_WIN32) 
-#include <unistd.h> 
-#endif 
- 
-#include <cassert> 
-#include <cstdint> 
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Produce stack trace
+
+#ifndef ABSL_DEBUGGING_INTERNAL_STACKTRACE_X86_INL_INC_
+#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_X86_INL_INC_
+
+#if defined(__linux__) && (defined(__i386__) || defined(__x86_64__))
+#include <ucontext.h>  // for ucontext_t
+#endif
+
+#if !defined(_WIN32)
+#include <unistd.h>
+#endif
+
+#include <cassert>
+#include <cstdint>
 #include <limits>
- 
+
 #include "y_absl/base/macros.h"
 #include "y_absl/base/port.h"
 #include "y_absl/debugging/internal/address_is_readable.h"
 #include "y_absl/debugging/internal/vdso_support.h"  // a no-op on non-elf or non-glibc systems
 #include "y_absl/debugging/stacktrace.h"
- 
+
 #include "y_absl/base/internal/raw_logging.h"
- 
+
 using y_absl::debugging_internal::AddressIsReadable;
- 
-#if defined(__linux__) && defined(__i386__) 
-// Count "push %reg" instructions in VDSO __kernel_vsyscall(), 
-// preceeding "syscall" or "sysenter". 
-// If __kernel_vsyscall uses frame pointer, answer 0. 
-// 
-// kMaxBytes tells how many instruction bytes of __kernel_vsyscall 
-// to analyze before giving up. Up to kMaxBytes+1 bytes of 
-// instructions could be accessed. 
-// 
-// Here are known __kernel_vsyscall instruction sequences: 
-// 
-// SYSENTER (linux-2.6.26/arch/x86/vdso/vdso32/sysenter.S). 
-// Used on Intel. 
-//  0xffffe400 <__kernel_vsyscall+0>:       push   %ecx 
-//  0xffffe401 <__kernel_vsyscall+1>:       push   %edx 
-//  0xffffe402 <__kernel_vsyscall+2>:       push   %ebp 
-//  0xffffe403 <__kernel_vsyscall+3>:       mov    %esp,%ebp 
-//  0xffffe405 <__kernel_vsyscall+5>:       sysenter 
-// 
-// SYSCALL (see linux-2.6.26/arch/x86/vdso/vdso32/syscall.S). 
-// Used on AMD. 
-//  0xffffe400 <__kernel_vsyscall+0>:       push   %ebp 
-//  0xffffe401 <__kernel_vsyscall+1>:       mov    %ecx,%ebp 
-//  0xffffe403 <__kernel_vsyscall+3>:       syscall 
-// 
- 
-// The sequence below isn't actually expected in Google fleet, 
-// here only for completeness. Remove this comment from OSS release. 
- 
-// i386 (see linux-2.6.26/arch/x86/vdso/vdso32/int80.S) 
-//  0xffffe400 <__kernel_vsyscall+0>:       int $0x80 
-//  0xffffe401 <__kernel_vsyscall+1>:       ret 
-// 
-static const int kMaxBytes = 10; 
- 
-// We use assert()s instead of DCHECK()s -- this is too low level 
-// for DCHECK(). 
- 
-static int CountPushInstructions(const unsigned char *const addr) { 
-  int result = 0; 
-  for (int i = 0; i < kMaxBytes; ++i) { 
-    if (addr[i] == 0x89) { 
-      // "mov reg,reg" 
-      if (addr[i + 1] == 0xE5) { 
-        // Found "mov %esp,%ebp". 
-        return 0; 
-      } 
-      ++i;  // Skip register encoding byte. 
-    } else if (addr[i] == 0x0F && 
-               (addr[i + 1] == 0x34 || addr[i + 1] == 0x05)) { 
-      // Found "sysenter" or "syscall". 
-      return result; 
-    } else if ((addr[i] & 0xF0) == 0x50) { 
-      // Found "push %reg". 
-      ++result; 
-    } else if (addr[i] == 0xCD && addr[i + 1] == 0x80) { 
-      // Found "int $0x80" 
-      assert(result == 0); 
-      return 0; 
-    } else { 
-      // Unexpected instruction. 
-      assert(false && "unexpected instruction in __kernel_vsyscall"); 
-      return 0; 
-    } 
-  } 
-  // Unexpected: didn't find SYSENTER or SYSCALL in 
-  // [__kernel_vsyscall, __kernel_vsyscall + kMaxBytes) interval. 
-  assert(false && "did not find SYSENTER or SYSCALL in __kernel_vsyscall"); 
-  return 0; 
-} 
-#endif 
- 
-// Assume stack frames larger than 100,000 bytes are bogus. 
-static const int kMaxFrameBytes = 100000; 
- 
-// Returns the stack frame pointer from signal context, 0 if unknown. 
-// vuc is a ucontext_t *.  We use void* to avoid the use 
-// of ucontext_t on non-POSIX systems. 
-static uintptr_t GetFP(const void *vuc) { 
-#if !defined(__linux__) 
-  static_cast<void>(vuc);  // Avoid an unused argument compiler warning. 
-#else 
-  if (vuc != nullptr) { 
-    auto *uc = reinterpret_cast<const ucontext_t *>(vuc); 
-#if defined(__i386__) 
-    const auto bp = uc->uc_mcontext.gregs[REG_EBP]; 
-    const auto sp = uc->uc_mcontext.gregs[REG_ESP]; 
-#elif defined(__x86_64__) 
-    const auto bp = uc->uc_mcontext.gregs[REG_RBP]; 
-    const auto sp = uc->uc_mcontext.gregs[REG_RSP]; 
-#else 
-    const uintptr_t bp = 0; 
-    const uintptr_t sp = 0; 
-#endif 
+
+#if defined(__linux__) && defined(__i386__)
+// Count "push %reg" instructions in VDSO __kernel_vsyscall(),
+// preceeding "syscall" or "sysenter".
+// If __kernel_vsyscall uses frame pointer, answer 0.
+//
+// kMaxBytes tells how many instruction bytes of __kernel_vsyscall
+// to analyze before giving up. Up to kMaxBytes+1 bytes of
+// instructions could be accessed.
+//
+// Here are known __kernel_vsyscall instruction sequences:
+//
+// SYSENTER (linux-2.6.26/arch/x86/vdso/vdso32/sysenter.S).
+// Used on Intel.
+//  0xffffe400 <__kernel_vsyscall+0>:       push   %ecx
+//  0xffffe401 <__kernel_vsyscall+1>:       push   %edx
+//  0xffffe402 <__kernel_vsyscall+2>:       push   %ebp
+//  0xffffe403 <__kernel_vsyscall+3>:       mov    %esp,%ebp
+//  0xffffe405 <__kernel_vsyscall+5>:       sysenter
+//
+// SYSCALL (see linux-2.6.26/arch/x86/vdso/vdso32/syscall.S).
+// Used on AMD.
+//  0xffffe400 <__kernel_vsyscall+0>:       push   %ebp
+//  0xffffe401 <__kernel_vsyscall+1>:       mov    %ecx,%ebp
+//  0xffffe403 <__kernel_vsyscall+3>:       syscall
+//
+
+// The sequence below isn't actually expected in Google fleet,
+// here only for completeness. Remove this comment from OSS release.
+
+// i386 (see linux-2.6.26/arch/x86/vdso/vdso32/int80.S)
+//  0xffffe400 <__kernel_vsyscall+0>:       int $0x80
+//  0xffffe401 <__kernel_vsyscall+1>:       ret
+//
+static const int kMaxBytes = 10;
+
+// We use assert()s instead of DCHECK()s -- this is too low level
+// for DCHECK().
+
+static int CountPushInstructions(const unsigned char *const addr) {
+  int result = 0;
+  for (int i = 0; i < kMaxBytes; ++i) {
+    if (addr[i] == 0x89) {
+      // "mov reg,reg"
+      if (addr[i + 1] == 0xE5) {
+        // Found "mov %esp,%ebp".
+        return 0;
+      }
+      ++i;  // Skip register encoding byte.
+    } else if (addr[i] == 0x0F &&
+               (addr[i + 1] == 0x34 || addr[i + 1] == 0x05)) {
+      // Found "sysenter" or "syscall".
+      return result;
+    } else if ((addr[i] & 0xF0) == 0x50) {
+      // Found "push %reg".
+      ++result;
+    } else if (addr[i] == 0xCD && addr[i + 1] == 0x80) {
+      // Found "int $0x80"
+      assert(result == 0);
+      return 0;
+    } else {
+      // Unexpected instruction.
+      assert(false && "unexpected instruction in __kernel_vsyscall");
+      return 0;
+    }
+  }
+  // Unexpected: didn't find SYSENTER or SYSCALL in
+  // [__kernel_vsyscall, __kernel_vsyscall + kMaxBytes) interval.
+  assert(false && "did not find SYSENTER or SYSCALL in __kernel_vsyscall");
+  return 0;
+}
+#endif
+
+// Assume stack frames larger than 100,000 bytes are bogus.
+static const int kMaxFrameBytes = 100000;
+
+// Returns the stack frame pointer from signal context, 0 if unknown.
+// vuc is a ucontext_t *.  We use void* to avoid the use
+// of ucontext_t on non-POSIX systems.
+static uintptr_t GetFP(const void *vuc) {
+#if !defined(__linux__)
+  static_cast<void>(vuc);  // Avoid an unused argument compiler warning.
+#else
+  if (vuc != nullptr) {
+    auto *uc = reinterpret_cast<const ucontext_t *>(vuc);
+#if defined(__i386__)
+    const auto bp = uc->uc_mcontext.gregs[REG_EBP];
+    const auto sp = uc->uc_mcontext.gregs[REG_ESP];
+#elif defined(__x86_64__)
+    const auto bp = uc->uc_mcontext.gregs[REG_RBP];
+    const auto sp = uc->uc_mcontext.gregs[REG_RSP];
+#else
+    const uintptr_t bp = 0;
+    const uintptr_t sp = 0;
+#endif
     // Sanity-check that the base pointer is valid. It's possible that some
     // code in the process is compiled with --copt=-fomit-frame-pointer or
-    // --copt=-momit-leaf-frame-pointer. 
-    // 
-    // TODO(bcmills): -momit-leaf-frame-pointer is currently the default 
-    // behavior when building with clang.  Talk to the C++ toolchain team about 
-    // fixing that. 
-    if (bp >= sp && bp - sp <= kMaxFrameBytes) return bp; 
- 
-    // If bp isn't a plausible frame pointer, return the stack pointer instead. 
-    // If we're lucky, it points to the start of a stack frame; otherwise, we'll 
-    // get one frame of garbage in the stack trace and fail the sanity check on 
-    // the next iteration. 
-    return sp; 
-  } 
-#endif 
-  return 0; 
-} 
- 
-// Given a pointer to a stack frame, locate and return the calling 
-// stackframe, or return null if no stackframe can be found. Perform sanity 
-// checks (the strictness of which is controlled by the boolean parameter 
-// "STRICT_UNWINDING") to reduce the chance that a bad pointer is returned. 
-template <bool STRICT_UNWINDING, bool WITH_CONTEXT> 
-ABSL_ATTRIBUTE_NO_SANITIZE_ADDRESS  // May read random elements from stack. 
-ABSL_ATTRIBUTE_NO_SANITIZE_MEMORY   // May read random elements from stack. 
+    // --copt=-momit-leaf-frame-pointer.
+    //
+    // TODO(bcmills): -momit-leaf-frame-pointer is currently the default
+    // behavior when building with clang.  Talk to the C++ toolchain team about
+    // fixing that.
+    if (bp >= sp && bp - sp <= kMaxFrameBytes) return bp;
+
+    // If bp isn't a plausible frame pointer, return the stack pointer instead.
+    // If we're lucky, it points to the start of a stack frame; otherwise, we'll
+    // get one frame of garbage in the stack trace and fail the sanity check on
+    // the next iteration.
+    return sp;
+  }
+#endif
+  return 0;
+}
+
+// Given a pointer to a stack frame, locate and return the calling
+// stackframe, or return null if no stackframe can be found. Perform sanity
+// checks (the strictness of which is controlled by the boolean parameter
+// "STRICT_UNWINDING") to reduce the chance that a bad pointer is returned.
+template <bool STRICT_UNWINDING, bool WITH_CONTEXT>
+ABSL_ATTRIBUTE_NO_SANITIZE_ADDRESS  // May read random elements from stack.
+ABSL_ATTRIBUTE_NO_SANITIZE_MEMORY   // May read random elements from stack.
 static void **NextStackFrame(void **old_fp, const void *uc,
                              size_t stack_low, size_t stack_high) {
-  void **new_fp = (void **)*old_fp; 
- 
-#if defined(__linux__) && defined(__i386__) 
-  if (WITH_CONTEXT && uc != nullptr) { 
-    // How many "push %reg" instructions are there at __kernel_vsyscall? 
-    // This is constant for a given kernel and processor, so compute 
-    // it only once. 
-    static int num_push_instructions = -1;  // Sentinel: not computed yet. 
-    // Initialize with sentinel value: __kernel_rt_sigreturn can not possibly 
-    // be there. 
-    static const unsigned char *kernel_rt_sigreturn_address = nullptr; 
-    static const unsigned char *kernel_vsyscall_address = nullptr; 
-    if (num_push_instructions == -1) { 
+  void **new_fp = (void **)*old_fp;
+
+#if defined(__linux__) && defined(__i386__)
+  if (WITH_CONTEXT && uc != nullptr) {
+    // How many "push %reg" instructions are there at __kernel_vsyscall?
+    // This is constant for a given kernel and processor, so compute
+    // it only once.
+    static int num_push_instructions = -1;  // Sentinel: not computed yet.
+    // Initialize with sentinel value: __kernel_rt_sigreturn can not possibly
+    // be there.
+    static const unsigned char *kernel_rt_sigreturn_address = nullptr;
+    static const unsigned char *kernel_vsyscall_address = nullptr;
+    if (num_push_instructions == -1) {
 #ifdef ABSL_HAVE_VDSO_SUPPORT
       y_absl::debugging_internal::VDSOSupport vdso;
-      if (vdso.IsPresent()) { 
+      if (vdso.IsPresent()) {
         y_absl::debugging_internal::VDSOSupport::SymbolInfo
-            rt_sigreturn_symbol_info; 
+            rt_sigreturn_symbol_info;
         y_absl::debugging_internal::VDSOSupport::SymbolInfo vsyscall_symbol_info;
-        if (!vdso.LookupSymbol("__kernel_rt_sigreturn", "LINUX_2.5", STT_FUNC, 
-                               &rt_sigreturn_symbol_info) || 
-            !vdso.LookupSymbol("__kernel_vsyscall", "LINUX_2.5", STT_FUNC, 
-                               &vsyscall_symbol_info) || 
-            rt_sigreturn_symbol_info.address == nullptr || 
-            vsyscall_symbol_info.address == nullptr) { 
-          // Unexpected: 32-bit VDSO is present, yet one of the expected 
-          // symbols is missing or null. 
-          assert(false && "VDSO is present, but doesn't have expected symbols"); 
-          num_push_instructions = 0; 
-        } else { 
-          kernel_rt_sigreturn_address = 
-              reinterpret_cast<const unsigned char *>( 
-                  rt_sigreturn_symbol_info.address); 
-          kernel_vsyscall_address = 
-              reinterpret_cast<const unsigned char *>( 
-                  vsyscall_symbol_info.address); 
-          num_push_instructions = 
-              CountPushInstructions(kernel_vsyscall_address); 
-        } 
-      } else { 
-        num_push_instructions = 0; 
-      } 
+        if (!vdso.LookupSymbol("__kernel_rt_sigreturn", "LINUX_2.5", STT_FUNC,
+                               &rt_sigreturn_symbol_info) ||
+            !vdso.LookupSymbol("__kernel_vsyscall", "LINUX_2.5", STT_FUNC,
+                               &vsyscall_symbol_info) ||
+            rt_sigreturn_symbol_info.address == nullptr ||
+            vsyscall_symbol_info.address == nullptr) {
+          // Unexpected: 32-bit VDSO is present, yet one of the expected
+          // symbols is missing or null.
+          assert(false && "VDSO is present, but doesn't have expected symbols");
+          num_push_instructions = 0;
+        } else {
+          kernel_rt_sigreturn_address =
+              reinterpret_cast<const unsigned char *>(
+                  rt_sigreturn_symbol_info.address);
+          kernel_vsyscall_address =
+              reinterpret_cast<const unsigned char *>(
+                  vsyscall_symbol_info.address);
+          num_push_instructions =
+              CountPushInstructions(kernel_vsyscall_address);
+        }
+      } else {
+        num_push_instructions = 0;
+      }
 #else  // ABSL_HAVE_VDSO_SUPPORT
       num_push_instructions = 0;
 #endif  // ABSL_HAVE_VDSO_SUPPORT
-    } 
-    if (num_push_instructions != 0 && kernel_rt_sigreturn_address != nullptr && 
-        old_fp[1] == kernel_rt_sigreturn_address) { 
-      const ucontext_t *ucv = static_cast<const ucontext_t *>(uc); 
-      // This kernel does not use frame pointer in its VDSO code, 
-      // and so %ebp is not suitable for unwinding. 
-      void **const reg_ebp = 
-          reinterpret_cast<void **>(ucv->uc_mcontext.gregs[REG_EBP]); 
-      const unsigned char *const reg_eip = 
-          reinterpret_cast<unsigned char *>(ucv->uc_mcontext.gregs[REG_EIP]); 
-      if (new_fp == reg_ebp && kernel_vsyscall_address <= reg_eip && 
-          reg_eip - kernel_vsyscall_address < kMaxBytes) { 
-        // We "stepped up" to __kernel_vsyscall, but %ebp is not usable. 
-        // Restore from 'ucv' instead. 
-        void **const reg_esp = 
-            reinterpret_cast<void **>(ucv->uc_mcontext.gregs[REG_ESP]); 
-        // Check that alleged %esp is not null and is reasonably aligned. 
-        if (reg_esp && 
-            ((uintptr_t)reg_esp & (sizeof(reg_esp) - 1)) == 0) { 
-          // Check that alleged %esp is actually readable. This is to prevent 
-          // "double fault" in case we hit the first fault due to e.g. stack 
-          // corruption. 
-          void *const reg_esp2 = reg_esp[num_push_instructions - 1]; 
-          if (AddressIsReadable(reg_esp2)) { 
-            // Alleged %esp is readable, use it for further unwinding. 
-            new_fp = reinterpret_cast<void **>(reg_esp2); 
-          } 
-        } 
-      } 
-    } 
-  } 
-#endif 
- 
-  const uintptr_t old_fp_u = reinterpret_cast<uintptr_t>(old_fp); 
-  const uintptr_t new_fp_u = reinterpret_cast<uintptr_t>(new_fp); 
- 
-  // Check that the transition from frame pointer old_fp to frame 
-  // pointer new_fp isn't clearly bogus.  Skip the checks if new_fp 
-  // matches the signal context, so that we don't skip out early when 
-  // using an alternate signal stack. 
-  // 
-  // TODO(bcmills): The GetFP call should be completely unnecessary when 
+    }
+    if (num_push_instructions != 0 && kernel_rt_sigreturn_address != nullptr &&
+        old_fp[1] == kernel_rt_sigreturn_address) {
+      const ucontext_t *ucv = static_cast<const ucontext_t *>(uc);
+      // This kernel does not use frame pointer in its VDSO code,
+      // and so %ebp is not suitable for unwinding.
+      void **const reg_ebp =
+          reinterpret_cast<void **>(ucv->uc_mcontext.gregs[REG_EBP]);
+      const unsigned char *const reg_eip =
+          reinterpret_cast<unsigned char *>(ucv->uc_mcontext.gregs[REG_EIP]);
+      if (new_fp == reg_ebp && kernel_vsyscall_address <= reg_eip &&
+          reg_eip - kernel_vsyscall_address < kMaxBytes) {
+        // We "stepped up" to __kernel_vsyscall, but %ebp is not usable.
+        // Restore from 'ucv' instead.
+        void **const reg_esp =
+            reinterpret_cast<void **>(ucv->uc_mcontext.gregs[REG_ESP]);
+        // Check that alleged %esp is not null and is reasonably aligned.
+        if (reg_esp &&
+            ((uintptr_t)reg_esp & (sizeof(reg_esp) - 1)) == 0) {
+          // Check that alleged %esp is actually readable. This is to prevent
+          // "double fault" in case we hit the first fault due to e.g. stack
+          // corruption.
+          void *const reg_esp2 = reg_esp[num_push_instructions - 1];
+          if (AddressIsReadable(reg_esp2)) {
+            // Alleged %esp is readable, use it for further unwinding.
+            new_fp = reinterpret_cast<void **>(reg_esp2);
+          }
+        }
+      }
+    }
+  }
+#endif
+
+  const uintptr_t old_fp_u = reinterpret_cast<uintptr_t>(old_fp);
+  const uintptr_t new_fp_u = reinterpret_cast<uintptr_t>(new_fp);
+
+  // Check that the transition from frame pointer old_fp to frame
+  // pointer new_fp isn't clearly bogus.  Skip the checks if new_fp
+  // matches the signal context, so that we don't skip out early when
+  // using an alternate signal stack.
+  //
+  // TODO(bcmills): The GetFP call should be completely unnecessary when
   // ENABLE_COMBINED_UNWINDER is set (because we should be back in the thread's
-  // stack by this point), but it is empirically still needed (e.g. when the 
-  // stack includes a call to abort).  unw_get_reg returns UNW_EBADREG for some 
-  // frames.  Figure out why GetValidFrameAddr and/or libunwind isn't doing what 
-  // it's supposed to. 
-  if (STRICT_UNWINDING && 
-      (!WITH_CONTEXT || uc == nullptr || new_fp_u != GetFP(uc))) { 
-    // With the stack growing downwards, older stack frame must be 
-    // at a greater address that the current one. 
-    if (new_fp_u <= old_fp_u) return nullptr; 
-    if (new_fp_u - old_fp_u > kMaxFrameBytes) return nullptr; 
+  // stack by this point), but it is empirically still needed (e.g. when the
+  // stack includes a call to abort).  unw_get_reg returns UNW_EBADREG for some
+  // frames.  Figure out why GetValidFrameAddr and/or libunwind isn't doing what
+  // it's supposed to.
+  if (STRICT_UNWINDING &&
+      (!WITH_CONTEXT || uc == nullptr || new_fp_u != GetFP(uc))) {
+    // With the stack growing downwards, older stack frame must be
+    // at a greater address that the current one.
+    if (new_fp_u <= old_fp_u) return nullptr;
+    if (new_fp_u - old_fp_u > kMaxFrameBytes) return nullptr;
 
     if (stack_low < old_fp_u && old_fp_u <= stack_high) {
       // Old BP was in the expected stack region...
@@ -271,94 +271,94 @@ static void **NextStackFrame(void **old_fp, const void *uc,
       // We may be here if we are executing in a co-routine with a
       // separate stack. We can't do safety checks in this case.
     }
-  } else { 
-    if (new_fp == nullptr) return nullptr;  // skip AddressIsReadable() below 
-    // In the non-strict mode, allow discontiguous stack frames. 
-    // (alternate-signal-stacks for example). 
-    if (new_fp == old_fp) return nullptr; 
-  } 
- 
-  if (new_fp_u & (sizeof(void *) - 1)) return nullptr; 
-#ifdef __i386__ 
-  // On 32-bit machines, the stack pointer can be very close to 
-  // 0xffffffff, so we explicitly check for a pointer into the 
-  // last two pages in the address space 
-  if (new_fp_u >= 0xffffe000) return nullptr; 
-#endif 
-#if !defined(_WIN32) 
-  if (!STRICT_UNWINDING) { 
-    // Lax sanity checks cause a crash in 32-bit tcmalloc/crash_reason_test 
-    // on AMD-based machines with VDSO-enabled kernels. 
-    // Make an extra sanity check to insure new_fp is readable. 
-    // Note: NextStackFrame<false>() is only called while the program 
-    //       is already on its last leg, so it's ok to be slow here. 
- 
-    if (!AddressIsReadable(new_fp)) { 
-      return nullptr; 
-    } 
-  } 
-#endif 
-  return new_fp; 
-} 
- 
-template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT> 
-ABSL_ATTRIBUTE_NO_SANITIZE_ADDRESS  // May read random elements from stack. 
-ABSL_ATTRIBUTE_NO_SANITIZE_MEMORY   // May read random elements from stack. 
-ABSL_ATTRIBUTE_NOINLINE 
-static int UnwindImpl(void **result, int *sizes, int max_depth, int skip_count, 
-                      const void *ucp, int *min_dropped_frames) { 
-  int n = 0; 
-  void **fp = reinterpret_cast<void **>(__builtin_frame_address(0)); 
- 
+  } else {
+    if (new_fp == nullptr) return nullptr;  // skip AddressIsReadable() below
+    // In the non-strict mode, allow discontiguous stack frames.
+    // (alternate-signal-stacks for example).
+    if (new_fp == old_fp) return nullptr;
+  }
+
+  if (new_fp_u & (sizeof(void *) - 1)) return nullptr;
+#ifdef __i386__
+  // On 32-bit machines, the stack pointer can be very close to
+  // 0xffffffff, so we explicitly check for a pointer into the
+  // last two pages in the address space
+  if (new_fp_u >= 0xffffe000) return nullptr;
+#endif
+#if !defined(_WIN32)
+  if (!STRICT_UNWINDING) {
+    // Lax sanity checks cause a crash in 32-bit tcmalloc/crash_reason_test
+    // on AMD-based machines with VDSO-enabled kernels.
+    // Make an extra sanity check to insure new_fp is readable.
+    // Note: NextStackFrame<false>() is only called while the program
+    //       is already on its last leg, so it's ok to be slow here.
+
+    if (!AddressIsReadable(new_fp)) {
+      return nullptr;
+    }
+  }
+#endif
+  return new_fp;
+}
+
+template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT>
+ABSL_ATTRIBUTE_NO_SANITIZE_ADDRESS  // May read random elements from stack.
+ABSL_ATTRIBUTE_NO_SANITIZE_MEMORY   // May read random elements from stack.
+ABSL_ATTRIBUTE_NOINLINE
+static int UnwindImpl(void **result, int *sizes, int max_depth, int skip_count,
+                      const void *ucp, int *min_dropped_frames) {
+  int n = 0;
+  void **fp = reinterpret_cast<void **>(__builtin_frame_address(0));
+
   size_t stack_low = getpagesize();  // Assume that the first page is not stack.
   size_t stack_high = std::numeric_limits<size_t>::max() - sizeof(void *);
 
-  while (fp && n < max_depth) { 
-    if (*(fp + 1) == reinterpret_cast<void *>(0)) { 
-      // In 64-bit code, we often see a frame that 
-      // points to itself and has a return address of 0. 
-      break; 
-    } 
+  while (fp && n < max_depth) {
+    if (*(fp + 1) == reinterpret_cast<void *>(0)) {
+      // In 64-bit code, we often see a frame that
+      // points to itself and has a return address of 0.
+      break;
+    }
     void **next_fp = NextStackFrame<!IS_STACK_FRAMES, IS_WITH_CONTEXT>(
         fp, ucp, stack_low, stack_high);
-    if (skip_count > 0) { 
-      skip_count--; 
-    } else { 
-      result[n] = *(fp + 1); 
-      if (IS_STACK_FRAMES) { 
-        if (next_fp > fp) { 
-          sizes[n] = (uintptr_t)next_fp - (uintptr_t)fp; 
-        } else { 
-          // A frame-size of 0 is used to indicate unknown frame size. 
-          sizes[n] = 0; 
-        } 
-      } 
-      n++; 
-    } 
-    fp = next_fp; 
-  } 
-  if (min_dropped_frames != nullptr) { 
-    // Implementation detail: we clamp the max of frames we are willing to 
-    // count, so as not to spend too much time in the loop below. 
-    const int kMaxUnwind = 1000; 
-    int j = 0; 
-    for (; fp != nullptr && j < kMaxUnwind; j++) { 
+    if (skip_count > 0) {
+      skip_count--;
+    } else {
+      result[n] = *(fp + 1);
+      if (IS_STACK_FRAMES) {
+        if (next_fp > fp) {
+          sizes[n] = (uintptr_t)next_fp - (uintptr_t)fp;
+        } else {
+          // A frame-size of 0 is used to indicate unknown frame size.
+          sizes[n] = 0;
+        }
+      }
+      n++;
+    }
+    fp = next_fp;
+  }
+  if (min_dropped_frames != nullptr) {
+    // Implementation detail: we clamp the max of frames we are willing to
+    // count, so as not to spend too much time in the loop below.
+    const int kMaxUnwind = 1000;
+    int j = 0;
+    for (; fp != nullptr && j < kMaxUnwind; j++) {
       fp = NextStackFrame<!IS_STACK_FRAMES, IS_WITH_CONTEXT>(fp, ucp, stack_low,
                                                              stack_high);
-    } 
-    *min_dropped_frames = j; 
-  } 
-  return n; 
-} 
- 
+    }
+    *min_dropped_frames = j;
+  }
+  return n;
+}
+
 namespace y_absl {
 ABSL_NAMESPACE_BEGIN
-namespace debugging_internal { 
-bool StackTraceWorksForTest() { 
-  return true; 
-} 
-}  // namespace debugging_internal 
+namespace debugging_internal {
+bool StackTraceWorksForTest() {
+  return true;
+}
+}  // namespace debugging_internal
 ABSL_NAMESPACE_END
 }  // namespace y_absl
- 
-#endif  // ABSL_DEBUGGING_INTERNAL_STACKTRACE_X86_INL_INC_ 
+
+#endif  // ABSL_DEBUGGING_INTERNAL_STACKTRACE_X86_INL_INC_
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/symbolize.h b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/symbolize.h
index 4cc63b690c..e6e2b0724a 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/symbolize.h
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/symbolize.h
@@ -1,67 +1,67 @@
-// Copyright 2018 The Abseil Authors. 
-// 
-// Licensed under the Apache License, Version 2.0 (the "License"); 
-// you may not use this file except in compliance with the License. 
-// You may obtain a copy of the License at 
-// 
-//      https://www.apache.org/licenses/LICENSE-2.0 
-// 
-// Unless required by applicable law or agreed to in writing, software 
-// distributed under the License is distributed on an "AS IS" BASIS, 
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
-// See the License for the specific language governing permissions and 
-// limitations under the License. 
- 
-// This file contains internal parts of the Abseil symbolizer. 
-// Do not depend on the anything in this file, it may change at anytime. 
- 
-#ifndef ABSL_DEBUGGING_INTERNAL_SYMBOLIZE_H_ 
-#define ABSL_DEBUGGING_INTERNAL_SYMBOLIZE_H_ 
- 
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// This file contains internal parts of the Abseil symbolizer.
+// Do not depend on the anything in this file, it may change at anytime.
+
+#ifndef ABSL_DEBUGGING_INTERNAL_SYMBOLIZE_H_
+#define ABSL_DEBUGGING_INTERNAL_SYMBOLIZE_H_
+
 #ifdef __cplusplus
 
-#include <cstddef> 
-#include <cstdint> 
- 
+#include <cstddef>
+#include <cstdint>
+
 #include "y_absl/base/config.h"
 #include "y_absl/strings/string_view.h"
 
-#ifdef ABSL_INTERNAL_HAVE_ELF_SYMBOLIZE 
-#error ABSL_INTERNAL_HAVE_ELF_SYMBOLIZE cannot be directly set 
+#ifdef ABSL_INTERNAL_HAVE_ELF_SYMBOLIZE
+#error ABSL_INTERNAL_HAVE_ELF_SYMBOLIZE cannot be directly set
 #elif defined(__ELF__) && defined(__GLIBC__) && !defined(__native_client__) \
       && !defined(__asmjs__) && !defined(__wasm__)
-#define ABSL_INTERNAL_HAVE_ELF_SYMBOLIZE 1 
- 
-#include <elf.h> 
-#include <link.h>  // For ElfW() macro. 
-#include <functional> 
+#define ABSL_INTERNAL_HAVE_ELF_SYMBOLIZE 1
+
+#include <elf.h>
+#include <link.h>  // For ElfW() macro.
+#include <functional>
 #include <util/generic/string.h>
 
 namespace y_absl {
 ABSL_NAMESPACE_BEGIN
-namespace debugging_internal { 
- 
-// Iterates over all sections, invoking callback on each with the section name 
-// and the section header. 
-// 
-// Returns true on success; otherwise returns false in case of errors. 
-// 
-// This is not async-signal-safe. 
-bool ForEachSection(int fd, 
+namespace debugging_internal {
+
+// Iterates over all sections, invoking callback on each with the section name
+// and the section header.
+//
+// Returns true on success; otherwise returns false in case of errors.
+//
+// This is not async-signal-safe.
+bool ForEachSection(int fd,
                     const std::function<bool(y_absl::string_view name,
-                                             const ElfW(Shdr) &)>& callback); 
- 
-// Gets the section header for the given name, if it exists. Returns true on 
-// success. Otherwise, returns false. 
-bool GetSectionHeaderByName(int fd, const char *name, size_t name_len, 
-                            ElfW(Shdr) *out); 
- 
-}  // namespace debugging_internal 
+                                             const ElfW(Shdr) &)>& callback);
+
+// Gets the section header for the given name, if it exists. Returns true on
+// success. Otherwise, returns false.
+bool GetSectionHeaderByName(int fd, const char *name, size_t name_len,
+                            ElfW(Shdr) *out);
+
+}  // namespace debugging_internal
 ABSL_NAMESPACE_END
 }  // namespace y_absl
- 
-#endif  // ABSL_INTERNAL_HAVE_ELF_SYMBOLIZE 
- 
+
+#endif  // ABSL_INTERNAL_HAVE_ELF_SYMBOLIZE
+
 #ifdef ABSL_INTERNAL_HAVE_DARWIN_SYMBOLIZE
 #error ABSL_INTERNAL_HAVE_DARWIN_SYMBOLIZE cannot be directly set
 #elif defined(__APPLE__)
@@ -76,68 +76,68 @@ ABSL_NAMESPACE_END
 
 namespace y_absl {
 ABSL_NAMESPACE_BEGIN
-namespace debugging_internal { 
- 
-struct SymbolDecoratorArgs { 
-  // The program counter we are getting symbolic name for. 
-  const void *pc; 
-  // 0 for main executable, load address for shared libraries. 
-  ptrdiff_t relocation; 
-  // Read-only file descriptor for ELF image covering "pc", 
-  // or -1 if no such ELF image exists in /proc/self/maps. 
-  int fd; 
-  // Output buffer, size. 
-  // Note: the buffer may not be empty -- default symbolizer may have already 
-  // produced some output, and earlier decorators may have adorned it in 
-  // some way. You are free to replace or augment the contents (within the 
-  // symbol_buf_size limit). 
-  char *const symbol_buf; 
-  size_t symbol_buf_size; 
-  // Temporary scratch space, size. 
-  // Use that space in preference to allocating your own stack buffer to 
-  // conserve stack. 
-  char *const tmp_buf; 
-  size_t tmp_buf_size; 
-  // User-provided argument 
-  void* arg; 
-}; 
-using SymbolDecorator = void (*)(const SymbolDecoratorArgs *); 
- 
-// Installs a function-pointer as a decorator. Returns a value less than zero 
-// if the system cannot install the decorator. Otherwise, returns a unique 
-// identifier corresponding to the decorator. This identifier can be used to 
-// uninstall the decorator - See RemoveSymbolDecorator() below. 
-int InstallSymbolDecorator(SymbolDecorator decorator, void* arg); 
- 
-// Removes a previously installed function-pointer decorator. Parameter "ticket" 
-// is the return-value from calling InstallSymbolDecorator(). 
-bool RemoveSymbolDecorator(int ticket); 
- 
-// Remove all installed decorators.  Returns true if successful, false if 
-// symbolization is currently in progress. 
-bool RemoveAllSymbolDecorators(void); 
- 
-// Registers an address range to a file mapping. 
-// 
-// Preconditions: 
-//   start <= end 
-//   filename != nullptr 
-// 
-// Returns true if the file was successfully registered. 
+namespace debugging_internal {
+
+struct SymbolDecoratorArgs {
+  // The program counter we are getting symbolic name for.
+  const void *pc;
+  // 0 for main executable, load address for shared libraries.
+  ptrdiff_t relocation;
+  // Read-only file descriptor for ELF image covering "pc",
+  // or -1 if no such ELF image exists in /proc/self/maps.
+  int fd;
+  // Output buffer, size.
+  // Note: the buffer may not be empty -- default symbolizer may have already
+  // produced some output, and earlier decorators may have adorned it in
+  // some way. You are free to replace or augment the contents (within the
+  // symbol_buf_size limit).
+  char *const symbol_buf;
+  size_t symbol_buf_size;
+  // Temporary scratch space, size.
+  // Use that space in preference to allocating your own stack buffer to
+  // conserve stack.
+  char *const tmp_buf;
+  size_t tmp_buf_size;
+  // User-provided argument
+  void* arg;
+};
+using SymbolDecorator = void (*)(const SymbolDecoratorArgs *);
+
+// Installs a function-pointer as a decorator. Returns a value less than zero
+// if the system cannot install the decorator. Otherwise, returns a unique
+// identifier corresponding to the decorator. This identifier can be used to
+// uninstall the decorator - See RemoveSymbolDecorator() below.
+int InstallSymbolDecorator(SymbolDecorator decorator, void* arg);
+
+// Removes a previously installed function-pointer decorator. Parameter "ticket"
+// is the return-value from calling InstallSymbolDecorator().
+bool RemoveSymbolDecorator(int ticket);
+
+// Remove all installed decorators.  Returns true if successful, false if
+// symbolization is currently in progress.
+bool RemoveAllSymbolDecorators(void);
+
+// Registers an address range to a file mapping.
+//
+// Preconditions:
+//   start <= end
+//   filename != nullptr
+//
+// Returns true if the file was successfully registered.
 bool RegisterFileMappingHint(const void* start, const void* end,
                              uint64_t offset, const char* filename);
- 
-// Looks up the file mapping registered by RegisterFileMappingHint for an 
-// address range. If there is one, the file name is stored in *filename and 
-// *start and *end are modified to reflect the registered mapping. Returns 
-// whether any hint was found. 
+
+// Looks up the file mapping registered by RegisterFileMappingHint for an
+// address range. If there is one, the file name is stored in *filename and
+// *start and *end are modified to reflect the registered mapping. Returns
+// whether any hint was found.
 bool GetFileMappingHint(const void** start, const void** end, uint64_t* offset,
-                        const char** filename); 
- 
-}  // namespace debugging_internal 
+                        const char** filename);
+
+}  // namespace debugging_internal
 ABSL_NAMESPACE_END
 }  // namespace y_absl
- 
+
 #endif  // __cplusplus
 
 #include <stdbool.h>
@@ -150,4 +150,4 @@ extern "C"
     YAbslInternalGetFileMappingHint(const void** start, const void** end,
                                    uint64_t* offset, const char** filename);
 
-#endif  // ABSL_DEBUGGING_INTERNAL_SYMBOLIZE_H_ 
+#endif  // ABSL_DEBUGGING_INTERNAL_SYMBOLIZE_H_
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/vdso_support.cc b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/vdso_support.cc
index d70b00a116..7905eba32f 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/vdso_support.cc
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/vdso_support.cc
@@ -1,55 +1,55 @@
-// Copyright 2017 The Abseil Authors. 
-// 
-// Licensed under the Apache License, Version 2.0 (the "License"); 
-// you may not use this file except in compliance with the License. 
-// You may obtain a copy of the License at 
-// 
-//      https://www.apache.org/licenses/LICENSE-2.0 
-// 
-// Unless required by applicable law or agreed to in writing, software 
-// distributed under the License is distributed on an "AS IS" BASIS, 
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
-// See the License for the specific language governing permissions and 
-// limitations under the License. 
- 
-// Allow dynamic symbol lookup in the kernel VDSO page. 
-// 
-// VDSOSupport -- a class representing kernel VDSO (if present). 
- 
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Allow dynamic symbol lookup in the kernel VDSO page.
+//
+// VDSOSupport -- a class representing kernel VDSO (if present).
+
 #include "y_absl/debugging/internal/vdso_support.h"
- 
-#ifdef ABSL_HAVE_VDSO_SUPPORT     // defined in vdso_support.h 
- 
+
+#ifdef ABSL_HAVE_VDSO_SUPPORT     // defined in vdso_support.h
+
 #if !defined(__has_include)
 #define __has_include(header) 0
 #endif
 
-#include <errno.h> 
-#include <fcntl.h> 
+#include <errno.h>
+#include <fcntl.h>
 #if __has_include(<syscall.h>)
 #include <syscall.h>
 #elif __has_include(<sys/syscall.h>)
-#include <sys/syscall.h> 
+#include <sys/syscall.h>
 #endif
-#include <unistd.h> 
- 
+#include <unistd.h>
+
 #if defined(__GLIBC__) && \
     (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 16))
 #define ABSL_HAVE_GETAUXVAL
 #endif
 
 #ifdef ABSL_HAVE_GETAUXVAL
-#include <sys/auxv.h> 
-#endif 
- 
+#include <sys/auxv.h>
+#endif
+
 #include "y_absl/base/dynamic_annotations.h"
 #include "y_absl/base/internal/raw_logging.h"
 #include "y_absl/base/port.h"
- 
-#ifndef AT_SYSINFO_EHDR 
-#define AT_SYSINFO_EHDR 33  // for crosstoolv10 
-#endif 
- 
+
+#ifndef AT_SYSINFO_EHDR
+#define AT_SYSINFO_EHDR 33  // for crosstoolv10
+#endif
+
 #if defined(__FreeBSD__)
 using Elf64_auxv_t = Elf64_Auxinfo;
 using Elf32_auxv_t = Elf32_Auxinfo;
@@ -57,135 +57,135 @@ using Elf32_auxv_t = Elf32_Auxinfo;
 
 namespace y_absl {
 ABSL_NAMESPACE_BEGIN
-namespace debugging_internal { 
- 
-ABSL_CONST_INIT 
-std::atomic<const void *> VDSOSupport::vdso_base_( 
-    debugging_internal::ElfMemImage::kInvalidBase); 
- 
-std::atomic<VDSOSupport::GetCpuFn> VDSOSupport::getcpu_fn_(&InitAndGetCPU); 
-VDSOSupport::VDSOSupport() 
-    // If vdso_base_ is still set to kInvalidBase, we got here 
-    // before VDSOSupport::Init has been called. Call it now. 
-    : image_(vdso_base_.load(std::memory_order_relaxed) == 
-                     debugging_internal::ElfMemImage::kInvalidBase 
-                 ? Init() 
-                 : vdso_base_.load(std::memory_order_relaxed)) {} 
- 
-// NOTE: we can't use GoogleOnceInit() below, because we can be 
-// called by tcmalloc, and none of the *once* stuff may be functional yet. 
-// 
-// In addition, we hope that the VDSOSupportHelper constructor 
-// causes this code to run before there are any threads, and before 
-// InitGoogle() has executed any chroot or setuid calls. 
-// 
-// Finally, even if there is a race here, it is harmless, because 
-// the operation should be idempotent. 
-const void *VDSOSupport::Init() { 
-  const auto kInvalidBase = debugging_internal::ElfMemImage::kInvalidBase; 
+namespace debugging_internal {
+
+ABSL_CONST_INIT
+std::atomic<const void *> VDSOSupport::vdso_base_(
+    debugging_internal::ElfMemImage::kInvalidBase);
+
+std::atomic<VDSOSupport::GetCpuFn> VDSOSupport::getcpu_fn_(&InitAndGetCPU);
+VDSOSupport::VDSOSupport()
+    // If vdso_base_ is still set to kInvalidBase, we got here
+    // before VDSOSupport::Init has been called. Call it now.
+    : image_(vdso_base_.load(std::memory_order_relaxed) ==
+                     debugging_internal::ElfMemImage::kInvalidBase
+                 ? Init()
+                 : vdso_base_.load(std::memory_order_relaxed)) {}
+
+// NOTE: we can't use GoogleOnceInit() below, because we can be
+// called by tcmalloc, and none of the *once* stuff may be functional yet.
+//
+// In addition, we hope that the VDSOSupportHelper constructor
+// causes this code to run before there are any threads, and before
+// InitGoogle() has executed any chroot or setuid calls.
+//
+// Finally, even if there is a race here, it is harmless, because
+// the operation should be idempotent.
+const void *VDSOSupport::Init() {
+  const auto kInvalidBase = debugging_internal::ElfMemImage::kInvalidBase;
 #ifdef ABSL_HAVE_GETAUXVAL
-  if (vdso_base_.load(std::memory_order_relaxed) == kInvalidBase) { 
-    errno = 0; 
-    const void *const sysinfo_ehdr = 
-        reinterpret_cast<const void *>(getauxval(AT_SYSINFO_EHDR)); 
-    if (errno == 0) { 
-      vdso_base_.store(sysinfo_ehdr, std::memory_order_relaxed); 
-    } 
-  } 
+  if (vdso_base_.load(std::memory_order_relaxed) == kInvalidBase) {
+    errno = 0;
+    const void *const sysinfo_ehdr =
+        reinterpret_cast<const void *>(getauxval(AT_SYSINFO_EHDR));
+    if (errno == 0) {
+      vdso_base_.store(sysinfo_ehdr, std::memory_order_relaxed);
+    }
+  }
 #endif  // ABSL_HAVE_GETAUXVAL
-  if (vdso_base_.load(std::memory_order_relaxed) == kInvalidBase) { 
-    int fd = open("/proc/self/auxv", O_RDONLY); 
-    if (fd == -1) { 
-      // Kernel too old to have a VDSO. 
-      vdso_base_.store(nullptr, std::memory_order_relaxed); 
-      getcpu_fn_.store(&GetCPUViaSyscall, std::memory_order_relaxed); 
-      return nullptr; 
-    } 
-    ElfW(auxv_t) aux; 
-    while (read(fd, &aux, sizeof(aux)) == sizeof(aux)) { 
-      if (aux.a_type == AT_SYSINFO_EHDR) { 
-        vdso_base_.store(reinterpret_cast<void *>(aux.a_un.a_val), 
-                         std::memory_order_relaxed); 
-        break; 
-      } 
-    } 
-    close(fd); 
-    if (vdso_base_.load(std::memory_order_relaxed) == kInvalidBase) { 
-      // Didn't find AT_SYSINFO_EHDR in auxv[]. 
-      vdso_base_.store(nullptr, std::memory_order_relaxed); 
-    } 
-  } 
-  GetCpuFn fn = &GetCPUViaSyscall;  // default if VDSO not present. 
-  if (vdso_base_.load(std::memory_order_relaxed)) { 
-    VDSOSupport vdso; 
-    SymbolInfo info; 
-    if (vdso.LookupSymbol("__vdso_getcpu", "LINUX_2.6", STT_FUNC, &info)) { 
-      fn = reinterpret_cast<GetCpuFn>(const_cast<void *>(info.address)); 
-    } 
-  } 
-  // Subtle: this code runs outside of any locks; prevent compiler 
-  // from assigning to getcpu_fn_ more than once. 
-  getcpu_fn_.store(fn, std::memory_order_relaxed); 
-  return vdso_base_.load(std::memory_order_relaxed); 
-} 
- 
-const void *VDSOSupport::SetBase(const void *base) { 
-  ABSL_RAW_CHECK(base != debugging_internal::ElfMemImage::kInvalidBase, 
-                 "internal error"); 
-  const void *old_base = vdso_base_.load(std::memory_order_relaxed); 
-  vdso_base_.store(base, std::memory_order_relaxed); 
-  image_.Init(base); 
-  // Also reset getcpu_fn_, so GetCPU could be tested with simulated VDSO. 
-  getcpu_fn_.store(&InitAndGetCPU, std::memory_order_relaxed); 
-  return old_base; 
-} 
- 
-bool VDSOSupport::LookupSymbol(const char *name, 
-                               const char *version, 
-                               int type, 
-                               SymbolInfo *info) const { 
-  return image_.LookupSymbol(name, version, type, info); 
-} 
- 
-bool VDSOSupport::LookupSymbolByAddress(const void *address, 
-                                        SymbolInfo *info_out) const { 
-  return image_.LookupSymbolByAddress(address, info_out); 
-} 
- 
-// NOLINT on 'long' because this routine mimics kernel api. 
-long VDSOSupport::GetCPUViaSyscall(unsigned *cpu,  // NOLINT(runtime/int) 
-                                   void *, void *) { 
-#ifdef SYS_getcpu 
-  return syscall(SYS_getcpu, cpu, nullptr, nullptr); 
-#else 
-  // x86_64 never implemented sys_getcpu(), except as a VDSO call. 
-  static_cast<void>(cpu);  // Avoid an unused argument compiler warning. 
-  errno = ENOSYS; 
-  return -1; 
-#endif 
-} 
- 
-// Use fast __vdso_getcpu if available. 
-long VDSOSupport::InitAndGetCPU(unsigned *cpu,  // NOLINT(runtime/int) 
-                                void *x, void *y) { 
-  Init(); 
-  GetCpuFn fn = getcpu_fn_.load(std::memory_order_relaxed); 
-  ABSL_RAW_CHECK(fn != &InitAndGetCPU, "Init() did not set getcpu_fn_"); 
-  return (*fn)(cpu, x, y); 
-} 
- 
-// This function must be very fast, and may be called from very 
-// low level (e.g. tcmalloc). Hence I avoid things like 
-// GoogleOnceInit() and ::operator new. 
-ABSL_ATTRIBUTE_NO_SANITIZE_MEMORY 
-int GetCPU() { 
-  unsigned cpu; 
-  int ret_code = (*VDSOSupport::getcpu_fn_)(&cpu, nullptr, nullptr); 
-  return ret_code == 0 ? cpu : ret_code; 
-} 
- 
-}  // namespace debugging_internal 
+  if (vdso_base_.load(std::memory_order_relaxed) == kInvalidBase) {
+    int fd = open("/proc/self/auxv", O_RDONLY);
+    if (fd == -1) {
+      // Kernel too old to have a VDSO.
+      vdso_base_.store(nullptr, std::memory_order_relaxed);
+      getcpu_fn_.store(&GetCPUViaSyscall, std::memory_order_relaxed);
+      return nullptr;
+    }
+    ElfW(auxv_t) aux;
+    while (read(fd, &aux, sizeof(aux)) == sizeof(aux)) {
+      if (aux.a_type == AT_SYSINFO_EHDR) {
+        vdso_base_.store(reinterpret_cast<void *>(aux.a_un.a_val),
+                         std::memory_order_relaxed);
+        break;
+      }
+    }
+    close(fd);
+    if (vdso_base_.load(std::memory_order_relaxed) == kInvalidBase) {
+      // Didn't find AT_SYSINFO_EHDR in auxv[].
+      vdso_base_.store(nullptr, std::memory_order_relaxed);
+    }
+  }
+  GetCpuFn fn = &GetCPUViaSyscall;  // default if VDSO not present.
+  if (vdso_base_.load(std::memory_order_relaxed)) {
+    VDSOSupport vdso;
+    SymbolInfo info;
+    if (vdso.LookupSymbol("__vdso_getcpu", "LINUX_2.6", STT_FUNC, &info)) {
+      fn = reinterpret_cast<GetCpuFn>(const_cast<void *>(info.address));
+    }
+  }
+  // Subtle: this code runs outside of any locks; prevent compiler
+  // from assigning to getcpu_fn_ more than once.
+  getcpu_fn_.store(fn, std::memory_order_relaxed);
+  return vdso_base_.load(std::memory_order_relaxed);
+}
+
+const void *VDSOSupport::SetBase(const void *base) {
+  ABSL_RAW_CHECK(base != debugging_internal::ElfMemImage::kInvalidBase,
+                 "internal error");
+  const void *old_base = vdso_base_.load(std::memory_order_relaxed);
+  vdso_base_.store(base, std::memory_order_relaxed);
+  image_.Init(base);
+  // Also reset getcpu_fn_, so GetCPU could be tested with simulated VDSO.
+  getcpu_fn_.store(&InitAndGetCPU, std::memory_order_relaxed);
+  return old_base;
+}
+
+bool VDSOSupport::LookupSymbol(const char *name,
+                               const char *version,
+                               int type,
+                               SymbolInfo *info) const {
+  return image_.LookupSymbol(name, version, type, info);
+}
+
+bool VDSOSupport::LookupSymbolByAddress(const void *address,
+                                        SymbolInfo *info_out) const {
+  return image_.LookupSymbolByAddress(address, info_out);
+}
+
+// NOLINT on 'long' because this routine mimics kernel api.
+long VDSOSupport::GetCPUViaSyscall(unsigned *cpu,  // NOLINT(runtime/int)
+                                   void *, void *) {
+#ifdef SYS_getcpu
+  return syscall(SYS_getcpu, cpu, nullptr, nullptr);
+#else
+  // x86_64 never implemented sys_getcpu(), except as a VDSO call.
+  static_cast<void>(cpu);  // Avoid an unused argument compiler warning.
+  errno = ENOSYS;
+  return -1;
+#endif
+}
+
+// Use fast __vdso_getcpu if available.
+long VDSOSupport::InitAndGetCPU(unsigned *cpu,  // NOLINT(runtime/int)
+                                void *x, void *y) {
+  Init();
+  GetCpuFn fn = getcpu_fn_.load(std::memory_order_relaxed);
+  ABSL_RAW_CHECK(fn != &InitAndGetCPU, "Init() did not set getcpu_fn_");
+  return (*fn)(cpu, x, y);
+}
+
+// This function must be very fast, and may be called from very
+// low level (e.g. tcmalloc). Hence I avoid things like
+// GoogleOnceInit() and ::operator new.
+ABSL_ATTRIBUTE_NO_SANITIZE_MEMORY
+int GetCPU() {
+  unsigned cpu;
+  int ret_code = (*VDSOSupport::getcpu_fn_)(&cpu, nullptr, nullptr);
+  return ret_code == 0 ? cpu : ret_code;
+}
+
+}  // namespace debugging_internal
 ABSL_NAMESPACE_END
 }  // namespace y_absl
- 
-#endif  // ABSL_HAVE_VDSO_SUPPORT 
+
+#endif  // ABSL_HAVE_VDSO_SUPPORT
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/vdso_support.h b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/vdso_support.h
index d50368a3dd..c0064b9fe1 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/vdso_support.h
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/internal/vdso_support.h
@@ -1,158 +1,158 @@
-// 
-// Copyright 2017 The Abseil Authors. 
-// 
-// Licensed under the Apache License, Version 2.0 (the "License"); 
-// you may not use this file except in compliance with the License. 
-// You may obtain a copy of the License at 
-// 
-//      https://www.apache.org/licenses/LICENSE-2.0 
-// 
-// Unless required by applicable law or agreed to in writing, software 
-// distributed under the License is distributed on an "AS IS" BASIS, 
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
-// See the License for the specific language governing permissions and 
-// limitations under the License. 
-// 
- 
-// Allow dynamic symbol lookup in the kernel VDSO page. 
-// 
-// VDSO stands for "Virtual Dynamic Shared Object" -- a page of 
-// executable code, which looks like a shared library, but doesn't 
-// necessarily exist anywhere on disk, and which gets mmap()ed into 
-// every process by kernels which support VDSO, such as 2.6.x for 32-bit 
-// executables, and 2.6.24 and above for 64-bit executables. 
-// 
-// More details could be found here: 
-// http://www.trilithium.com/johan/2005/08/linux-gate/ 
-// 
-// VDSOSupport -- a class representing kernel VDSO (if present). 
-// 
-// Example usage: 
-//  VDSOSupport vdso; 
-//  VDSOSupport::SymbolInfo info; 
-//  typedef (*FN)(unsigned *, void *, void *); 
-//  FN fn = nullptr; 
-//  if (vdso.LookupSymbol("__vdso_getcpu", "LINUX_2.6", STT_FUNC, &info)) { 
-//     fn = reinterpret_cast<FN>(info.address); 
-//  } 
- 
-#ifndef ABSL_DEBUGGING_INTERNAL_VDSO_SUPPORT_H_ 
-#define ABSL_DEBUGGING_INTERNAL_VDSO_SUPPORT_H_ 
- 
-#include <atomic> 
- 
+//
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+// Allow dynamic symbol lookup in the kernel VDSO page.
+//
+// VDSO stands for "Virtual Dynamic Shared Object" -- a page of
+// executable code, which looks like a shared library, but doesn't
+// necessarily exist anywhere on disk, and which gets mmap()ed into
+// every process by kernels which support VDSO, such as 2.6.x for 32-bit
+// executables, and 2.6.24 and above for 64-bit executables.
+//
+// More details could be found here:
+// http://www.trilithium.com/johan/2005/08/linux-gate/
+//
+// VDSOSupport -- a class representing kernel VDSO (if present).
+//
+// Example usage:
+//  VDSOSupport vdso;
+//  VDSOSupport::SymbolInfo info;
+//  typedef (*FN)(unsigned *, void *, void *);
+//  FN fn = nullptr;
+//  if (vdso.LookupSymbol("__vdso_getcpu", "LINUX_2.6", STT_FUNC, &info)) {
+//     fn = reinterpret_cast<FN>(info.address);
+//  }
+
+#ifndef ABSL_DEBUGGING_INTERNAL_VDSO_SUPPORT_H_
+#define ABSL_DEBUGGING_INTERNAL_VDSO_SUPPORT_H_
+
+#include <atomic>
+
 #include "y_absl/base/attributes.h"
 #include "y_absl/debugging/internal/elf_mem_image.h"
- 
-#ifdef ABSL_HAVE_ELF_MEM_IMAGE 
- 
-#ifdef ABSL_HAVE_VDSO_SUPPORT 
-#error ABSL_HAVE_VDSO_SUPPORT cannot be directly set 
-#else 
-#define ABSL_HAVE_VDSO_SUPPORT 1 
-#endif 
- 
+
+#ifdef ABSL_HAVE_ELF_MEM_IMAGE
+
+#ifdef ABSL_HAVE_VDSO_SUPPORT
+#error ABSL_HAVE_VDSO_SUPPORT cannot be directly set
+#else
+#define ABSL_HAVE_VDSO_SUPPORT 1
+#endif
+
 namespace y_absl {
 ABSL_NAMESPACE_BEGIN
-namespace debugging_internal { 
- 
-// NOTE: this class may be used from within tcmalloc, and can not 
-// use any memory allocation routines. 
-class VDSOSupport { 
- public: 
-  VDSOSupport(); 
- 
-  typedef ElfMemImage::SymbolInfo SymbolInfo; 
-  typedef ElfMemImage::SymbolIterator SymbolIterator; 
- 
-  // On PowerPC64 VDSO symbols can either be of type STT_FUNC or STT_NOTYPE 
-  // depending on how the kernel is built.  The kernel is normally built with 
-  // STT_NOTYPE type VDSO symbols.  Let's make things simpler first by using a 
-  // compile-time constant. 
-#ifdef __powerpc64__ 
-  enum { kVDSOSymbolType = STT_NOTYPE }; 
-#else 
-  enum { kVDSOSymbolType = STT_FUNC }; 
-#endif 
- 
-  // Answers whether we have a vdso at all. 
-  bool IsPresent() const { return image_.IsPresent(); } 
- 
-  // Allow to iterate over all VDSO symbols. 
-  SymbolIterator begin() const { return image_.begin(); } 
-  SymbolIterator end() const { return image_.end(); } 
- 
-  // Look up versioned dynamic symbol in the kernel VDSO. 
-  // Returns false if VDSO is not present, or doesn't contain given 
-  // symbol/version/type combination. 
-  // If info_out != nullptr, additional details are filled in. 
-  bool LookupSymbol(const char *name, const char *version, 
-                    int symbol_type, SymbolInfo *info_out) const; 
- 
-  // Find info about symbol (if any) which overlaps given address. 
-  // Returns true if symbol was found; false if VDSO isn't present 
-  // or doesn't have a symbol overlapping given address. 
-  // If info_out != nullptr, additional details are filled in. 
-  bool LookupSymbolByAddress(const void *address, SymbolInfo *info_out) const; 
- 
-  // Used only for testing. Replace real VDSO base with a mock. 
-  // Returns previous value of vdso_base_. After you are done testing, 
-  // you are expected to call SetBase() with previous value, in order to 
-  // reset state to the way it was. 
-  const void *SetBase(const void *s); 
- 
-  // Computes vdso_base_ and returns it. Should be called as early as 
-  // possible; before any thread creation, chroot or setuid. 
-  static const void *Init(); 
- 
- private: 
-  // image_ represents VDSO ELF image in memory. 
-  // image_.ehdr_ == nullptr implies there is no VDSO. 
-  ElfMemImage image_; 
- 
-  // Cached value of auxv AT_SYSINFO_EHDR, computed once. 
-  // This is a tri-state: 
-  //   kInvalidBase   => value hasn't been determined yet. 
-  //              0   => there is no VDSO. 
-  //           else   => vma of VDSO Elf{32,64}_Ehdr. 
-  // 
-  // When testing with mock VDSO, low bit is set. 
-  // The low bit is always available because vdso_base_ is 
-  // page-aligned. 
-  static std::atomic<const void *> vdso_base_; 
- 
-  // NOLINT on 'long' because these routines mimic kernel api. 
-  // The 'cache' parameter may be used by some versions of the kernel, 
-  // and should be nullptr or point to a static buffer containing at 
-  // least two 'long's. 
-  static long InitAndGetCPU(unsigned *cpu, void *cache,     // NOLINT 'long'. 
-                            void *unused); 
-  static long GetCPUViaSyscall(unsigned *cpu, void *cache,  // NOLINT 'long'. 
-                               void *unused); 
-  typedef long (*GetCpuFn)(unsigned *cpu, void *cache,      // NOLINT 'long'. 
-                           void *unused); 
- 
-  // This function pointer may point to InitAndGetCPU, 
-  // GetCPUViaSyscall, or __vdso_getcpu at different stages of initialization. 
-  ABSL_CONST_INIT static std::atomic<GetCpuFn> getcpu_fn_; 
- 
-  friend int GetCPU(void);  // Needs access to getcpu_fn_. 
- 
-  VDSOSupport(const VDSOSupport&) = delete; 
-  VDSOSupport& operator=(const VDSOSupport&) = delete; 
-}; 
- 
-// Same as sched_getcpu() on later glibc versions. 
-// Return current CPU, using (fast) __vdso_getcpu@LINUX_2.6 if present, 
-// otherwise use syscall(SYS_getcpu,...). 
-// May return -1 with errno == ENOSYS if the kernel doesn't 
-// support SYS_getcpu. 
-int GetCPU(); 
- 
-}  // namespace debugging_internal 
+namespace debugging_internal {
+
+// NOTE: this class may be used from within tcmalloc, and can not
+// use any memory allocation routines.
+class VDSOSupport {
+ public:
+  VDSOSupport();
+
+  typedef ElfMemImage::SymbolInfo SymbolInfo;
+  typedef ElfMemImage::SymbolIterator SymbolIterator;
+
+  // On PowerPC64 VDSO symbols can either be of type STT_FUNC or STT_NOTYPE
+  // depending on how the kernel is built.  The kernel is normally built with
+  // STT_NOTYPE type VDSO symbols.  Let's make things simpler first by using a
+  // compile-time constant.
+#ifdef __powerpc64__
+  enum { kVDSOSymbolType = STT_NOTYPE };
+#else
+  enum { kVDSOSymbolType = STT_FUNC };
+#endif
+
+  // Answers whether we have a vdso at all.
+  bool IsPresent() const { return image_.IsPresent(); }
+
+  // Allow to iterate over all VDSO symbols.
+  SymbolIterator begin() const { return image_.begin(); }
+  SymbolIterator end() const { return image_.end(); }
+
+  // Look up versioned dynamic symbol in the kernel VDSO.
+  // Returns false if VDSO is not present, or doesn't contain given
+  // symbol/version/type combination.
+  // If info_out != nullptr, additional details are filled in.
+  bool LookupSymbol(const char *name, const char *version,
+                    int symbol_type, SymbolInfo *info_out) const;
+
+  // Find info about symbol (if any) which overlaps given address.
+  // Returns true if symbol was found; false if VDSO isn't present
+  // or doesn't have a symbol overlapping given address.
+  // If info_out != nullptr, additional details are filled in.
+  bool LookupSymbolByAddress(const void *address, SymbolInfo *info_out) const;
+
+  // Used only for testing. Replace real VDSO base with a mock.
+  // Returns previous value of vdso_base_. After you are done testing,
+  // you are expected to call SetBase() with previous value, in order to
+  // reset state to the way it was.
+  const void *SetBase(const void *s);
+
+  // Computes vdso_base_ and returns it. Should be called as early as
+  // possible; before any thread creation, chroot or setuid.
+  static const void *Init();
+
+ private:
+  // image_ represents VDSO ELF image in memory.
+  // image_.ehdr_ == nullptr implies there is no VDSO.
+  ElfMemImage image_;
+
+  // Cached value of auxv AT_SYSINFO_EHDR, computed once.
+  // This is a tri-state:
+  //   kInvalidBase   => value hasn't been determined yet.
+  //              0   => there is no VDSO.
+  //           else   => vma of VDSO Elf{32,64}_Ehdr.
+  //
+  // When testing with mock VDSO, low bit is set.
+  // The low bit is always available because vdso_base_ is
+  // page-aligned.
+  static std::atomic<const void *> vdso_base_;
+
+  // NOLINT on 'long' because these routines mimic kernel api.
+  // The 'cache' parameter may be used by some versions of the kernel,
+  // and should be nullptr or point to a static buffer containing at
+  // least two 'long's.
+  static long InitAndGetCPU(unsigned *cpu, void *cache,     // NOLINT 'long'.
+                            void *unused);
+  static long GetCPUViaSyscall(unsigned *cpu, void *cache,  // NOLINT 'long'.
+                               void *unused);
+  typedef long (*GetCpuFn)(unsigned *cpu, void *cache,      // NOLINT 'long'.
+                           void *unused);
+
+  // This function pointer may point to InitAndGetCPU,
+  // GetCPUViaSyscall, or __vdso_getcpu at different stages of initialization.
+  ABSL_CONST_INIT static std::atomic<GetCpuFn> getcpu_fn_;
+
+  friend int GetCPU(void);  // Needs access to getcpu_fn_.
+
+  VDSOSupport(const VDSOSupport&) = delete;
+  VDSOSupport& operator=(const VDSOSupport&) = delete;
+};
+
+// Same as sched_getcpu() on later glibc versions.
+// Return current CPU, using (fast) __vdso_getcpu@LINUX_2.6 if present,
+// otherwise use syscall(SYS_getcpu,...).
+// May return -1 with errno == ENOSYS if the kernel doesn't
+// support SYS_getcpu.
+int GetCPU();
+
+}  // namespace debugging_internal
 ABSL_NAMESPACE_END
 }  // namespace y_absl
- 
-#endif  // ABSL_HAVE_ELF_MEM_IMAGE 
- 
-#endif  // ABSL_DEBUGGING_INTERNAL_VDSO_SUPPORT_H_ 
+
+#endif  // ABSL_HAVE_ELF_MEM_IMAGE
+
+#endif  // ABSL_DEBUGGING_INTERNAL_VDSO_SUPPORT_H_
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/leak_check.cc b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/leak_check.cc
index 8e2d16eb34..ae5cf79fe2 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/leak_check.cc
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/leak_check.cc
@@ -1,49 +1,49 @@
-// Copyright 2017 The Abseil Authors. 
-// 
-// Licensed under the Apache License, Version 2.0 (the "License"); 
-// you may not use this file except in compliance with the License. 
-// You may obtain a copy of the License at 
-// 
-//      https://www.apache.org/licenses/LICENSE-2.0 
-// 
-// Unless required by applicable law or agreed to in writing, software 
-// distributed under the License is distributed on an "AS IS" BASIS, 
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
-// See the License for the specific language governing permissions and 
-// limitations under the License. 
- 
-// Wrappers around lsan_interface functions. 
-// When lsan is not linked in, these functions are not available, 
-// therefore Abseil code which depends on these functions is conditioned on the 
-// definition of LEAK_SANITIZER. 
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Wrappers around lsan_interface functions.
+// When lsan is not linked in, these functions are not available,
+// therefore Abseil code which depends on these functions is conditioned on the
+// definition of LEAK_SANITIZER.
 #include "y_absl/base/attributes.h"
 #include "y_absl/debugging/leak_check.h"
- 
-#ifndef LEAK_SANITIZER 
- 
+
+#ifndef LEAK_SANITIZER
+
 namespace y_absl {
 ABSL_NAMESPACE_BEGIN
-bool HaveLeakSanitizer() { return false; } 
+bool HaveLeakSanitizer() { return false; }
 bool LeakCheckerIsActive() { return false; }
-void DoIgnoreLeak(const void*) { } 
-void RegisterLivePointers(const void*, size_t) { } 
-void UnRegisterLivePointers(const void*, size_t) { } 
-LeakCheckDisabler::LeakCheckDisabler() { } 
-LeakCheckDisabler::~LeakCheckDisabler() { } 
+void DoIgnoreLeak(const void*) { }
+void RegisterLivePointers(const void*, size_t) { }
+void UnRegisterLivePointers(const void*, size_t) { }
+LeakCheckDisabler::LeakCheckDisabler() { }
+LeakCheckDisabler::~LeakCheckDisabler() { }
 ABSL_NAMESPACE_END
 }  // namespace y_absl
- 
-#else 
- 
-#include <sanitizer/lsan_interface.h> 
- 
+
+#else
+
+#include <sanitizer/lsan_interface.h>
+
 #if ABSL_HAVE_ATTRIBUTE_WEAK
 extern "C" ABSL_ATTRIBUTE_WEAK int __lsan_is_turned_off();
 #endif
 
 namespace y_absl {
 ABSL_NAMESPACE_BEGIN
-bool HaveLeakSanitizer() { return true; } 
+bool HaveLeakSanitizer() { return true; }
 
 #if ABSL_HAVE_ATTRIBUTE_WEAK
 bool LeakCheckerIsActive() {
@@ -54,16 +54,16 @@ bool LeakCheckerIsActive() { return true; }
 #endif
 
 bool FindAndReportLeaks() { return __lsan_do_recoverable_leak_check(); }
-void DoIgnoreLeak(const void* ptr) { __lsan_ignore_object(ptr); } 
-void RegisterLivePointers(const void* ptr, size_t size) { 
-  __lsan_register_root_region(ptr, size); 
-} 
-void UnRegisterLivePointers(const void* ptr, size_t size) { 
-  __lsan_unregister_root_region(ptr, size); 
-} 
-LeakCheckDisabler::LeakCheckDisabler() { __lsan_disable(); } 
-LeakCheckDisabler::~LeakCheckDisabler() { __lsan_enable(); } 
+void DoIgnoreLeak(const void* ptr) { __lsan_ignore_object(ptr); }
+void RegisterLivePointers(const void* ptr, size_t size) {
+  __lsan_register_root_region(ptr, size);
+}
+void UnRegisterLivePointers(const void* ptr, size_t size) {
+  __lsan_unregister_root_region(ptr, size);
+}
+LeakCheckDisabler::LeakCheckDisabler() { __lsan_disable(); }
+LeakCheckDisabler::~LeakCheckDisabler() { __lsan_enable(); }
 ABSL_NAMESPACE_END
 }  // namespace y_absl
- 
-#endif  // LEAK_SANITIZER 
+
+#endif  // LEAK_SANITIZER
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/leak_check.h b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/leak_check.h
index 4813c19247..d69f08f248 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/leak_check.h
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/leak_check.h
@@ -1,82 +1,82 @@
-// Copyright 2018 The Abseil Authors. 
-// 
-// Licensed under the Apache License, Version 2.0 (the "License"); 
-// you may not use this file except in compliance with the License. 
-// You may obtain a copy of the License at 
-// 
-//      https://www.apache.org/licenses/LICENSE-2.0 
-// 
-// Unless required by applicable law or agreed to in writing, software 
-// distributed under the License is distributed on an "AS IS" BASIS, 
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
-// See the License for the specific language governing permissions and 
-// limitations under the License. 
-// 
-// ----------------------------------------------------------------------------- 
-// File: leak_check.h 
-// ----------------------------------------------------------------------------- 
-// 
-// This file contains functions that affect leak checking behavior within 
-// targets built with the LeakSanitizer (LSan), a memory leak detector that is 
-// integrated within the AddressSanitizer (ASan) as an additional component, or 
-// which can be used standalone. LSan and ASan are included (or can be provided) 
-// as additional components for most compilers such as Clang, gcc and MSVC. 
-// Note: this leak checking API is not yet supported in MSVC. 
-// Leak checking is enabled by default in all ASan builds. 
-// 
-// See https://github.com/google/sanitizers/wiki/AddressSanitizerLeakSanitizer 
-// 
-// ----------------------------------------------------------------------------- 
-#ifndef ABSL_DEBUGGING_LEAK_CHECK_H_ 
-#define ABSL_DEBUGGING_LEAK_CHECK_H_ 
- 
-#include <cstddef> 
- 
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: leak_check.h
+// -----------------------------------------------------------------------------
+//
+// This file contains functions that affect leak checking behavior within
+// targets built with the LeakSanitizer (LSan), a memory leak detector that is
+// integrated within the AddressSanitizer (ASan) as an additional component, or
+// which can be used standalone. LSan and ASan are included (or can be provided)
+// as additional components for most compilers such as Clang, gcc and MSVC.
+// Note: this leak checking API is not yet supported in MSVC.
+// Leak checking is enabled by default in all ASan builds.
+//
+// See https://github.com/google/sanitizers/wiki/AddressSanitizerLeakSanitizer
+//
+// -----------------------------------------------------------------------------
+#ifndef ABSL_DEBUGGING_LEAK_CHECK_H_
+#define ABSL_DEBUGGING_LEAK_CHECK_H_
+
+#include <cstddef>
+
 #include "y_absl/base/config.h"
 
 namespace y_absl {
 ABSL_NAMESPACE_BEGIN
- 
-// HaveLeakSanitizer() 
-// 
-// Returns true if a leak-checking sanitizer (either ASan or standalone LSan) is 
-// currently built into this target. 
-bool HaveLeakSanitizer(); 
- 
+
+// HaveLeakSanitizer()
+//
+// Returns true if a leak-checking sanitizer (either ASan or standalone LSan) is
+// currently built into this target.
+bool HaveLeakSanitizer();
+
 // LeakCheckerIsActive()
 //
 // Returns true if a leak-checking sanitizer (either ASan or standalone LSan) is
 // currently built into this target and is turned on.
 bool LeakCheckerIsActive();
 
-// DoIgnoreLeak() 
-// 
-// Implements `IgnoreLeak()` below. This function should usually 
-// not be called directly; calling `IgnoreLeak()` is preferred. 
-void DoIgnoreLeak(const void* ptr); 
- 
-// IgnoreLeak() 
-// 
-// Instruct the leak sanitizer to ignore leak warnings on the object referenced 
-// by the passed pointer, as well as all heap objects transitively referenced 
-// by it. The passed object pointer can point to either the beginning of the 
-// object or anywhere within it. 
-// 
-// Example: 
-// 
-//   static T* obj = IgnoreLeak(new T(...)); 
-// 
-// If the passed `ptr` does not point to an actively allocated object at the 
-// time `IgnoreLeak()` is called, the call is a no-op; if it is actively 
+// DoIgnoreLeak()
+//
+// Implements `IgnoreLeak()` below. This function should usually
+// not be called directly; calling `IgnoreLeak()` is preferred.
+void DoIgnoreLeak(const void* ptr);
+
+// IgnoreLeak()
+//
+// Instruct the leak sanitizer to ignore leak warnings on the object referenced
+// by the passed pointer, as well as all heap objects transitively referenced
+// by it. The passed object pointer can point to either the beginning of the
+// object or anywhere within it.
+//
+// Example:
+//
+//   static T* obj = IgnoreLeak(new T(...));
+//
+// If the passed `ptr` does not point to an actively allocated object at the
+// time `IgnoreLeak()` is called, the call is a no-op; if it is actively
 // allocated, leak sanitizer will assume this object is referenced even if
 // there is no actual reference in user memory.
-// 
-template <typename T> 
-T* IgnoreLeak(T* ptr) { 
-  DoIgnoreLeak(ptr); 
-  return ptr; 
-} 
- 
+//
+template <typename T>
+T* IgnoreLeak(T* ptr) {
+  DoIgnoreLeak(ptr);
+  return ptr;
+}
+
 // FindAndReportLeaks()
 //
 // If any leaks are detected, prints a leak report and returns true.  This
@@ -90,44 +90,44 @@ T* IgnoreLeak(T* ptr) {
 // }
 bool FindAndReportLeaks();
 
-// LeakCheckDisabler 
-// 
-// This helper class indicates that any heap allocations done in the code block 
-// covered by the scoped object, which should be allocated on the stack, will 
-// not be reported as leaks. Leak check disabling will occur within the code 
-// block and any nested function calls within the code block. 
-// 
-// Example: 
-// 
-//   void Foo() { 
-//     LeakCheckDisabler disabler; 
-//     ... code that allocates objects whose leaks should be ignored ... 
-//   } 
-// 
-// REQUIRES: Destructor runs in same thread as constructor 
-class LeakCheckDisabler { 
- public: 
-  LeakCheckDisabler(); 
-  LeakCheckDisabler(const LeakCheckDisabler&) = delete; 
-  LeakCheckDisabler& operator=(const LeakCheckDisabler&) = delete; 
-  ~LeakCheckDisabler(); 
-}; 
- 
-// RegisterLivePointers() 
-// 
-// Registers `ptr[0,size-1]` as pointers to memory that is still actively being 
-// referenced and for which leak checking should be ignored. This function is 
-// useful if you store pointers in mapped memory, for memory ranges that we know 
-// are correct but for which normal analysis would flag as leaked code. 
-void RegisterLivePointers(const void* ptr, size_t size); 
- 
-// UnRegisterLivePointers() 
-// 
-// Deregisters the pointers previously marked as active in 
-// `RegisterLivePointers()`, enabling leak checking of those pointers. 
-void UnRegisterLivePointers(const void* ptr, size_t size); 
- 
+// LeakCheckDisabler
+//
+// This helper class indicates that any heap allocations done in the code block
+// covered by the scoped object, which should be allocated on the stack, will
+// not be reported as leaks. Leak check disabling will occur within the code
+// block and any nested function calls within the code block.
+//
+// Example:
+//
+//   void Foo() {
+//     LeakCheckDisabler disabler;
+//     ... code that allocates objects whose leaks should be ignored ...
+//   }
+//
+// REQUIRES: Destructor runs in same thread as constructor
+class LeakCheckDisabler {
+ public:
+  LeakCheckDisabler();
+  LeakCheckDisabler(const LeakCheckDisabler&) = delete;
+  LeakCheckDisabler& operator=(const LeakCheckDisabler&) = delete;
+  ~LeakCheckDisabler();
+};
+
+// RegisterLivePointers()
+//
+// Registers `ptr[0,size-1]` as pointers to memory that is still actively being
+// referenced and for which leak checking should be ignored. This function is
+// useful if you store pointers in mapped memory, for memory ranges that we know
+// are correct but for which normal analysis would flag as leaked code.
+void RegisterLivePointers(const void* ptr, size_t size);
+
+// UnRegisterLivePointers()
+//
+// Deregisters the pointers previously marked as active in
+// `RegisterLivePointers()`, enabling leak checking of those pointers.
+void UnRegisterLivePointers(const void* ptr, size_t size);
+
 ABSL_NAMESPACE_END
 }  // namespace y_absl
- 
-#endif  // ABSL_DEBUGGING_LEAK_CHECK_H_ 
+
+#endif  // ABSL_DEBUGGING_LEAK_CHECK_H_
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/leak_check/ya.make b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/leak_check/ya.make
index 155e75f319..f22152ef8a 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/leak_check/ya.make
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/leak_check/ya.make
@@ -1,26 +1,26 @@
-# Generated by devtools/yamaker. 
- 
-LIBRARY() 
- 
+# Generated by devtools/yamaker.
+
+LIBRARY()
+
 WITHOUT_LICENSE_TEXTS()
- 
+
 OWNER(
     somov
     g:cpp-contrib
 )
 
-LICENSE(Apache-2.0) 
- 
+LICENSE(Apache-2.0)
+
 ADDINCL(
     GLOBAL contrib/restricted/abseil-cpp-tstring
 )
- 
-NO_COMPILER_WARNINGS() 
- 
+
+NO_COMPILER_WARNINGS()
+
 SRCDIR(contrib/restricted/abseil-cpp-tstring/y_absl/debugging)
- 
-SRCS( 
-    leak_check.cc 
-) 
- 
-END() 
+
+SRCS(
+    leak_check.cc
+)
+
+END()
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/leak_check_disable.cc b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/leak_check_disable.cc
index 5b3bc37282..924d6e3d54 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/leak_check_disable.cc
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/leak_check_disable.cc
@@ -1,20 +1,20 @@
-// Copyright 2017 The Abseil Authors. 
-// 
-// Licensed under the Apache License, Version 2.0 (the "License"); 
-// you may not use this file except in compliance with the License. 
-// You may obtain a copy of the License at 
-// 
-//      https://www.apache.org/licenses/LICENSE-2.0 
-// 
-// Unless required by applicable law or agreed to in writing, software 
-// distributed under the License is distributed on an "AS IS" BASIS, 
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
-// See the License for the specific language governing permissions and 
-// limitations under the License. 
- 
-// Disable LeakSanitizer when this file is linked in. 
-// This function overrides __lsan_is_turned_off from sanitizer/lsan_interface.h 
-extern "C" int __lsan_is_turned_off(); 
-extern "C" int __lsan_is_turned_off() { 
-  return 1; 
-} 
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Disable LeakSanitizer when this file is linked in.
+// This function overrides __lsan_is_turned_off from sanitizer/lsan_interface.h
+extern "C" int __lsan_is_turned_off();
+extern "C" int __lsan_is_turned_off() {
+  return 1;
+}
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/leak_check_disable/ya.make b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/leak_check_disable/ya.make
index c857b3cf23..41792f1bc6 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/leak_check_disable/ya.make
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/leak_check_disable/ya.make
@@ -1,26 +1,26 @@
-# Generated by devtools/yamaker. 
- 
-LIBRARY() 
- 
+# Generated by devtools/yamaker.
+
+LIBRARY()
+
 WITHOUT_LICENSE_TEXTS()
- 
+
 OWNER(
     somov
     g:cpp-contrib
 )
 
-LICENSE(Apache-2.0) 
- 
+LICENSE(Apache-2.0)
+
 ADDINCL(
     GLOBAL contrib/restricted/abseil-cpp-tstring
 )
- 
-NO_COMPILER_WARNINGS() 
- 
+
+NO_COMPILER_WARNINGS()
+
 SRCDIR(contrib/restricted/abseil-cpp-tstring/y_absl/debugging)
- 
-SRCS( 
-    leak_check_disable.cc 
-) 
- 
-END() 
+
+SRCS(
+    leak_check_disable.cc
+)
+
+END()
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/stacktrace.cc b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/stacktrace.cc
index 4a31185723..9263d6a2a8 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/stacktrace.cc
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/stacktrace.cc
@@ -1,52 +1,52 @@
-// Copyright 2017 The Abseil Authors. 
-// 
-// Licensed under the Apache License, Version 2.0 (the "License"); 
-// you may not use this file except in compliance with the License. 
-// You may obtain a copy of the License at 
-// 
-//      https://www.apache.org/licenses/LICENSE-2.0 
-// 
-// Unless required by applicable law or agreed to in writing, software 
-// distributed under the License is distributed on an "AS IS" BASIS, 
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
-// See the License for the specific language governing permissions and 
-// limitations under the License. 
- 
-// Produce stack trace. 
-// 
-// There are three different ways we can try to get the stack trace: 
-// 
-// 1) Our hand-coded stack-unwinder.  This depends on a certain stack 
-//    layout, which is used by gcc (and those systems using a 
-//    gcc-compatible ABI) on x86 systems, at least since gcc 2.95. 
-//    It uses the frame pointer to do its work. 
-// 
-// 2) The libunwind library.  This is still in development, and as a 
-//    separate library adds a new dependency, but doesn't need a frame 
-//    pointer.  It also doesn't call malloc. 
-// 
-// 3) The gdb unwinder -- also the one used by the c++ exception code. 
-//    It's obviously well-tested, but has a fatal flaw: it can call 
-//    malloc() from the unwinder.  This is a problem because we're 
-//    trying to use the unwinder to instrument malloc(). 
-// 
-// Note: if you add a new implementation here, make sure it works 
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Produce stack trace.
+//
+// There are three different ways we can try to get the stack trace:
+//
+// 1) Our hand-coded stack-unwinder.  This depends on a certain stack
+//    layout, which is used by gcc (and those systems using a
+//    gcc-compatible ABI) on x86 systems, at least since gcc 2.95.
+//    It uses the frame pointer to do its work.
+//
+// 2) The libunwind library.  This is still in development, and as a
+//    separate library adds a new dependency, but doesn't need a frame
+//    pointer.  It also doesn't call malloc.
+//
+// 3) The gdb unwinder -- also the one used by the c++ exception code.
+//    It's obviously well-tested, but has a fatal flaw: it can call
+//    malloc() from the unwinder.  This is a problem because we're
+//    trying to use the unwinder to instrument malloc().
+//
+// Note: if you add a new implementation here, make sure it works
 // correctly when y_absl::GetStackTrace() is called with max_depth == 0.
-// Some code may do that. 
- 
+// Some code may do that.
+
 #include "y_absl/debugging/stacktrace.h"
- 
-#include <atomic> 
- 
+
+#include <atomic>
+
 #include "y_absl/base/attributes.h"
 #include "y_absl/base/port.h"
 #include "y_absl/debugging/internal/stacktrace_config.h"
- 
-#if defined(ABSL_STACKTRACE_INL_HEADER) 
-#include ABSL_STACKTRACE_INL_HEADER 
-#else 
-# error Cannot calculate stack trace: will need to write for your environment 
- 
+
+#if defined(ABSL_STACKTRACE_INL_HEADER)
+#include ABSL_STACKTRACE_INL_HEADER
+#else
+# error Cannot calculate stack trace: will need to write for your environment
+
 # include "y_absl/debugging/internal/stacktrace_aarch64-inl.inc"
 # include "y_absl/debugging/internal/stacktrace_arm-inl.inc"
 # include "y_absl/debugging/internal/stacktrace_emscripten-inl.inc"
@@ -56,87 +56,87 @@
 # include "y_absl/debugging/internal/stacktrace_unimplemented-inl.inc"
 # include "y_absl/debugging/internal/stacktrace_win32-inl.inc"
 # include "y_absl/debugging/internal/stacktrace_x86-inl.inc"
-#endif 
- 
+#endif
+
 namespace y_absl {
 ABSL_NAMESPACE_BEGIN
-namespace { 
- 
-typedef int (*Unwinder)(void**, int*, int, int, const void*, int*); 
-std::atomic<Unwinder> custom; 
- 
-template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT> 
-ABSL_ATTRIBUTE_ALWAYS_INLINE inline int Unwind(void** result, int* sizes, 
-                                               int max_depth, int skip_count, 
-                                               const void* uc, 
-                                               int* min_dropped_frames) { 
-  Unwinder f = &UnwindImpl<IS_STACK_FRAMES, IS_WITH_CONTEXT>; 
-  Unwinder g = custom.load(std::memory_order_acquire); 
-  if (g != nullptr) f = g; 
- 
-  // Add 1 to skip count for the unwinder function itself 
-  int size = (*f)(result, sizes, max_depth, skip_count + 1, uc, 
-                  min_dropped_frames); 
-  // To disable tail call to (*f)(...) 
-  ABSL_BLOCK_TAIL_CALL_OPTIMIZATION(); 
-  return size; 
-} 
- 
-}  // anonymous namespace 
- 
-ABSL_ATTRIBUTE_NOINLINE ABSL_ATTRIBUTE_NO_TAIL_CALL int GetStackFrames( 
-    void** result, int* sizes, int max_depth, int skip_count) { 
-  return Unwind<true, false>(result, sizes, max_depth, skip_count, nullptr, 
-                             nullptr); 
-} 
- 
-ABSL_ATTRIBUTE_NOINLINE ABSL_ATTRIBUTE_NO_TAIL_CALL int 
-GetStackFramesWithContext(void** result, int* sizes, int max_depth, 
-                          int skip_count, const void* uc, 
-                          int* min_dropped_frames) { 
-  return Unwind<true, true>(result, sizes, max_depth, skip_count, uc, 
-                            min_dropped_frames); 
-} 
- 
-ABSL_ATTRIBUTE_NOINLINE ABSL_ATTRIBUTE_NO_TAIL_CALL int GetStackTrace( 
-    void** result, int max_depth, int skip_count) { 
-  return Unwind<false, false>(result, nullptr, max_depth, skip_count, nullptr, 
-                              nullptr); 
-} 
- 
-ABSL_ATTRIBUTE_NOINLINE ABSL_ATTRIBUTE_NO_TAIL_CALL int 
-GetStackTraceWithContext(void** result, int max_depth, int skip_count, 
-                         const void* uc, int* min_dropped_frames) { 
-  return Unwind<false, true>(result, nullptr, max_depth, skip_count, uc, 
-                             min_dropped_frames); 
-} 
- 
-void SetStackUnwinder(Unwinder w) { 
-  custom.store(w, std::memory_order_release); 
-} 
- 
-int DefaultStackUnwinder(void** pcs, int* sizes, int depth, int skip, 
-                         const void* uc, int* min_dropped_frames) { 
-  skip++;  // For this function 
-  Unwinder f = nullptr; 
-  if (sizes == nullptr) { 
-    if (uc == nullptr) { 
-      f = &UnwindImpl<false, false>; 
-    } else { 
-      f = &UnwindImpl<false, true>; 
-    } 
-  } else { 
-    if (uc == nullptr) { 
-      f = &UnwindImpl<true, false>; 
-    } else { 
-      f = &UnwindImpl<true, true>; 
-    } 
-  } 
-  volatile int x = 0; 
-  int n = (*f)(pcs, sizes, depth, skip, uc, min_dropped_frames); 
-  x = 1; (void) x;  // To disable tail call to (*f)(...) 
-  return n; 
-} 
- 
+namespace {
+
+typedef int (*Unwinder)(void**, int*, int, int, const void*, int*);
+std::atomic<Unwinder> custom;
+
+template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT>
+ABSL_ATTRIBUTE_ALWAYS_INLINE inline int Unwind(void** result, int* sizes,
+                                               int max_depth, int skip_count,
+                                               const void* uc,
+                                               int* min_dropped_frames) {
+  Unwinder f = &UnwindImpl<IS_STACK_FRAMES, IS_WITH_CONTEXT>;
+  Unwinder g = custom.load(std::memory_order_acquire);
+  if (g != nullptr) f = g;
+
+  // Add 1 to skip count for the unwinder function itself
+  int size = (*f)(result, sizes, max_depth, skip_count + 1, uc,
+                  min_dropped_frames);
+  // To disable tail call to (*f)(...)
+  ABSL_BLOCK_TAIL_CALL_OPTIMIZATION();
+  return size;
+}
+
+}  // anonymous namespace
+
+ABSL_ATTRIBUTE_NOINLINE ABSL_ATTRIBUTE_NO_TAIL_CALL int GetStackFrames(
+    void** result, int* sizes, int max_depth, int skip_count) {
+  return Unwind<true, false>(result, sizes, max_depth, skip_count, nullptr,
+                             nullptr);
+}
+
+ABSL_ATTRIBUTE_NOINLINE ABSL_ATTRIBUTE_NO_TAIL_CALL int
+GetStackFramesWithContext(void** result, int* sizes, int max_depth,
+                          int skip_count, const void* uc,
+                          int* min_dropped_frames) {
+  return Unwind<true, true>(result, sizes, max_depth, skip_count, uc,
+                            min_dropped_frames);
+}
+
+ABSL_ATTRIBUTE_NOINLINE ABSL_ATTRIBUTE_NO_TAIL_CALL int GetStackTrace(
+    void** result, int max_depth, int skip_count) {
+  return Unwind<false, false>(result, nullptr, max_depth, skip_count, nullptr,
+                              nullptr);
+}
+
+ABSL_ATTRIBUTE_NOINLINE ABSL_ATTRIBUTE_NO_TAIL_CALL int
+GetStackTraceWithContext(void** result, int max_depth, int skip_count,
+                         const void* uc, int* min_dropped_frames) {
+  return Unwind<false, true>(result, nullptr, max_depth, skip_count, uc,
+                             min_dropped_frames);
+}
+
+void SetStackUnwinder(Unwinder w) {
+  custom.store(w, std::memory_order_release);
+}
+
+int DefaultStackUnwinder(void** pcs, int* sizes, int depth, int skip,
+                         const void* uc, int* min_dropped_frames) {
+  skip++;  // For this function
+  Unwinder f = nullptr;
+  if (sizes == nullptr) {
+    if (uc == nullptr) {
+      f = &UnwindImpl<false, false>;
+    } else {
+      f = &UnwindImpl<false, true>;
+    }
+  } else {
+    if (uc == nullptr) {
+      f = &UnwindImpl<true, false>;
+    } else {
+      f = &UnwindImpl<true, true>;
+    }
+  }
+  volatile int x = 0;
+  int n = (*f)(pcs, sizes, depth, skip, uc, min_dropped_frames);
+  x = 1; (void) x;  // To disable tail call to (*f)(...)
+  return n;
+}
+
 ABSL_NAMESPACE_END
 }  // namespace y_absl
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/stacktrace.h b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/stacktrace.h
index bb5af5746f..cbd48b986b 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/stacktrace.h
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/stacktrace.h
@@ -1,231 +1,231 @@
-// Copyright 2018 The Abseil Authors. 
-// 
-// Licensed under the Apache License, Version 2.0 (the "License"); 
-// you may not use this file except in compliance with the License. 
-// You may obtain a copy of the License at 
-// 
-//      https://www.apache.org/licenses/LICENSE-2.0 
-// 
-// Unless required by applicable law or agreed to in writing, software 
-// distributed under the License is distributed on an "AS IS" BASIS, 
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
-// See the License for the specific language governing permissions and 
-// limitations under the License. 
-// 
-// ----------------------------------------------------------------------------- 
-// File: stacktrace.h 
-// ----------------------------------------------------------------------------- 
-// 
-// This file contains routines to extract the current stack trace and associated 
-// stack frames. These functions are thread-safe and async-signal-safe. 
-// 
-// Note that stack trace functionality is platform dependent and requires 
-// additional support from the compiler/build system in most cases. (That is, 
-// this functionality generally only works on platforms/builds that have been 
-// specifically configured to support it.) 
-// 
-// Note: stack traces in Abseil that do not utilize a symbolizer will result in 
-// frames consisting of function addresses rather than human-readable function 
-// names. (See symbolize.h for information on symbolizing these values.) 
- 
-#ifndef ABSL_DEBUGGING_STACKTRACE_H_ 
-#define ABSL_DEBUGGING_STACKTRACE_H_ 
- 
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: stacktrace.h
+// -----------------------------------------------------------------------------
+//
+// This file contains routines to extract the current stack trace and associated
+// stack frames. These functions are thread-safe and async-signal-safe.
+//
+// Note that stack trace functionality is platform dependent and requires
+// additional support from the compiler/build system in most cases. (That is,
+// this functionality generally only works on platforms/builds that have been
+// specifically configured to support it.)
+//
+// Note: stack traces in Abseil that do not utilize a symbolizer will result in
+// frames consisting of function addresses rather than human-readable function
+// names. (See symbolize.h for information on symbolizing these values.)
+
+#ifndef ABSL_DEBUGGING_STACKTRACE_H_
+#define ABSL_DEBUGGING_STACKTRACE_H_
+
 #include "y_absl/base/config.h"
 
 namespace y_absl {
 ABSL_NAMESPACE_BEGIN
- 
-// GetStackFrames() 
-// 
-// Records program counter values for up to `max_depth` frames, skipping the 
-// most recent `skip_count` stack frames, stores their corresponding values 
-// and sizes in `results` and `sizes` buffers, and returns the number of frames 
+
+// GetStackFrames()
+//
+// Records program counter values for up to `max_depth` frames, skipping the
+// most recent `skip_count` stack frames, stores their corresponding values
+// and sizes in `results` and `sizes` buffers, and returns the number of frames
 // stored. (Note that the frame generated for the `y_absl::GetStackFrames()`
-// routine itself is also skipped.) 
-// 
-// Example: 
-// 
-//      main() { foo(); } 
-//      foo() { bar(); } 
-//      bar() { 
-//        void* result[10]; 
-//        int sizes[10]; 
+// routine itself is also skipped.)
+//
+// Example:
+//
+//      main() { foo(); }
+//      foo() { bar(); }
+//      bar() {
+//        void* result[10];
+//        int sizes[10];
 //        int depth = y_absl::GetStackFrames(result, sizes, 10, 1);
-//      } 
-// 
-// The current stack frame would consist of three function calls: `bar()`, 
-// `foo()`, and then `main()`; however, since the `GetStackFrames()` call sets 
-// `skip_count` to `1`, it will skip the frame for `bar()`, the most recently 
-// invoked function call. It will therefore return 2 and fill `result` with 
-// program counters within the following functions: 
-// 
-//      result[0]       foo() 
-//      result[1]       main() 
-// 
-// (Note: in practice, a few more entries after `main()` may be added to account 
-// for startup processes.) 
-// 
-// Corresponding stack frame sizes will also be recorded: 
-// 
-//    sizes[0]       16 
-//    sizes[1]       16 
-// 
-// (Stack frame sizes of `16` above are just for illustration purposes.) 
-// 
-// Stack frame sizes of 0 or less indicate that those frame sizes couldn't 
-// be identified. 
-// 
-// This routine may return fewer stack frame entries than are 
-// available. Also note that `result` and `sizes` must both be non-null. 
-extern int GetStackFrames(void** result, int* sizes, int max_depth, 
-                          int skip_count); 
- 
-// GetStackFramesWithContext() 
-// 
-// Records program counter values obtained from a signal handler. Records 
-// program counter values for up to `max_depth` frames, skipping the most recent 
-// `skip_count` stack frames, stores their corresponding values and sizes in 
-// `results` and `sizes` buffers, and returns the number of frames stored. (Note 
+//      }
+//
+// The current stack frame would consist of three function calls: `bar()`,
+// `foo()`, and then `main()`; however, since the `GetStackFrames()` call sets
+// `skip_count` to `1`, it will skip the frame for `bar()`, the most recently
+// invoked function call. It will therefore return 2 and fill `result` with
+// program counters within the following functions:
+//
+//      result[0]       foo()
+//      result[1]       main()
+//
+// (Note: in practice, a few more entries after `main()` may be added to account
+// for startup processes.)
+//
+// Corresponding stack frame sizes will also be recorded:
+//
+//    sizes[0]       16
+//    sizes[1]       16
+//
+// (Stack frame sizes of `16` above are just for illustration purposes.)
+//
+// Stack frame sizes of 0 or less indicate that those frame sizes couldn't
+// be identified.
+//
+// This routine may return fewer stack frame entries than are
+// available. Also note that `result` and `sizes` must both be non-null.
+extern int GetStackFrames(void** result, int* sizes, int max_depth,
+                          int skip_count);
+
+// GetStackFramesWithContext()
+//
+// Records program counter values obtained from a signal handler. Records
+// program counter values for up to `max_depth` frames, skipping the most recent
+// `skip_count` stack frames, stores their corresponding values and sizes in
+// `results` and `sizes` buffers, and returns the number of frames stored. (Note
 // that the frame generated for the `y_absl::GetStackFramesWithContext()` routine
-// itself is also skipped.) 
-// 
-// The `uc` parameter, if non-null, should be a pointer to a `ucontext_t` value 
-// passed to a signal handler registered via the `sa_sigaction` field of a 
-// `sigaction` struct. (See 
-// http://man7.org/linux/man-pages/man2/sigaction.2.html.) The `uc` value may 
-// help a stack unwinder to provide a better stack trace under certain 
-// conditions. `uc` may safely be null. 
-// 
-// The `min_dropped_frames` output parameter, if non-null, points to the 
-// location to note any dropped stack frames, if any, due to buffer limitations 
-// or other reasons. (This value will be set to `0` if no frames were dropped.) 
-// The number of total stack frames is guaranteed to be >= skip_count + 
-// max_depth + *min_dropped_frames. 
-extern int GetStackFramesWithContext(void** result, int* sizes, int max_depth, 
-                                     int skip_count, const void* uc, 
-                                     int* min_dropped_frames); 
- 
-// GetStackTrace() 
-// 
-// Records program counter values for up to `max_depth` frames, skipping the 
-// most recent `skip_count` stack frames, stores their corresponding values 
-// in `results`, and returns the number of frames 
+// itself is also skipped.)
+//
+// The `uc` parameter, if non-null, should be a pointer to a `ucontext_t` value
+// passed to a signal handler registered via the `sa_sigaction` field of a
+// `sigaction` struct. (See
+// http://man7.org/linux/man-pages/man2/sigaction.2.html.) The `uc` value may
+// help a stack unwinder to provide a better stack trace under certain
+// conditions. `uc` may safely be null.
+//
+// The `min_dropped_frames` output parameter, if non-null, points to the
+// location to note any dropped stack frames, if any, due to buffer limitations
+// or other reasons. (This value will be set to `0` if no frames were dropped.)
+// The number of total stack frames is guaranteed to be >= skip_count +
+// max_depth + *min_dropped_frames.
+extern int GetStackFramesWithContext(void** result, int* sizes, int max_depth,
+                                     int skip_count, const void* uc,
+                                     int* min_dropped_frames);
+
+// GetStackTrace()
+//
+// Records program counter values for up to `max_depth` frames, skipping the
+// most recent `skip_count` stack frames, stores their corresponding values
+// in `results`, and returns the number of frames
 // stored. Note that this function is similar to `y_absl::GetStackFrames()`
-// except that it returns the stack trace only, and not stack frame sizes. 
-// 
-// Example: 
-// 
-//      main() { foo(); } 
-//      foo() { bar(); } 
-//      bar() { 
-//        void* result[10]; 
+// except that it returns the stack trace only, and not stack frame sizes.
+//
+// Example:
+//
+//      main() { foo(); }
+//      foo() { bar(); }
+//      bar() {
+//        void* result[10];
 //        int depth = y_absl::GetStackTrace(result, 10, 1);
-//      } 
-// 
-// This produces: 
-// 
-//      result[0]       foo 
-//      result[1]       main 
-//           ....       ... 
-// 
-// `result` must not be null. 
-extern int GetStackTrace(void** result, int max_depth, int skip_count); 
- 
-// GetStackTraceWithContext() 
-// 
-// Records program counter values obtained from a signal handler. Records 
-// program counter values for up to `max_depth` frames, skipping the most recent 
-// `skip_count` stack frames, stores their corresponding values in `results`, 
-// and returns the number of frames stored. (Note that the frame generated for 
+//      }
+//
+// This produces:
+//
+//      result[0]       foo
+//      result[1]       main
+//           ....       ...
+//
+// `result` must not be null.
+extern int GetStackTrace(void** result, int max_depth, int skip_count);
+
+// GetStackTraceWithContext()
+//
+// Records program counter values obtained from a signal handler. Records
+// program counter values for up to `max_depth` frames, skipping the most recent
+// `skip_count` stack frames, stores their corresponding values in `results`,
+// and returns the number of frames stored. (Note that the frame generated for
 // the `y_absl::GetStackFramesWithContext()` routine itself is also skipped.)
-// 
-// The `uc` parameter, if non-null, should be a pointer to a `ucontext_t` value 
-// passed to a signal handler registered via the `sa_sigaction` field of a 
-// `sigaction` struct. (See 
-// http://man7.org/linux/man-pages/man2/sigaction.2.html.) The `uc` value may 
-// help a stack unwinder to provide a better stack trace under certain 
-// conditions. `uc` may safely be null. 
-// 
-// The `min_dropped_frames` output parameter, if non-null, points to the 
-// location to note any dropped stack frames, if any, due to buffer limitations 
-// or other reasons. (This value will be set to `0` if no frames were dropped.) 
-// The number of total stack frames is guaranteed to be >= skip_count + 
-// max_depth + *min_dropped_frames. 
-extern int GetStackTraceWithContext(void** result, int max_depth, 
-                                    int skip_count, const void* uc, 
-                                    int* min_dropped_frames); 
- 
-// SetStackUnwinder() 
-// 
-// Provides a custom function for unwinding stack frames that will be used in 
-// place of the default stack unwinder when invoking the static 
-// GetStack{Frames,Trace}{,WithContext}() functions above. 
-// 
-// The arguments passed to the unwinder function will match the 
+//
+// The `uc` parameter, if non-null, should be a pointer to a `ucontext_t` value
+// passed to a signal handler registered via the `sa_sigaction` field of a
+// `sigaction` struct. (See
+// http://man7.org/linux/man-pages/man2/sigaction.2.html.) The `uc` value may
+// help a stack unwinder to provide a better stack trace under certain
+// conditions. `uc` may safely be null.
+//
+// The `min_dropped_frames` output parameter, if non-null, points to the
+// location to note any dropped stack frames, if any, due to buffer limitations
+// or other reasons. (This value will be set to `0` if no frames were dropped.)
+// The number of total stack frames is guaranteed to be >= skip_count +
+// max_depth + *min_dropped_frames.
+extern int GetStackTraceWithContext(void** result, int max_depth,
+                                    int skip_count, const void* uc,
+                                    int* min_dropped_frames);
+
+// SetStackUnwinder()
+//
+// Provides a custom function for unwinding stack frames that will be used in
+// place of the default stack unwinder when invoking the static
+// GetStack{Frames,Trace}{,WithContext}() functions above.
+//
+// The arguments passed to the unwinder function will match the
 // arguments passed to `y_absl::GetStackFramesWithContext()` except that sizes
-// will be non-null iff the caller is interested in frame sizes. 
-// 
-// If unwinder is set to null, we revert to the default stack-tracing behavior. 
-// 
-// ***************************************************************************** 
-// WARNING 
-// ***************************************************************************** 
-// 
+// will be non-null iff the caller is interested in frame sizes.
+//
+// If unwinder is set to null, we revert to the default stack-tracing behavior.
+//
+// *****************************************************************************
+// WARNING
+// *****************************************************************************
+//
 // y_absl::SetStackUnwinder is not suitable for general purpose use.  It is
-// provided for custom runtimes. 
+// provided for custom runtimes.
 // Some things to watch out for when calling `y_absl::SetStackUnwinder()`:
-// 
-// (a) The unwinder may be called from within signal handlers and 
-// therefore must be async-signal-safe. 
-// 
-// (b) Even after a custom stack unwinder has been unregistered, other 
-// threads may still be in the process of using that unwinder. 
-// Therefore do not clean up any state that may be needed by an old 
-// unwinder. 
-// ***************************************************************************** 
-extern void SetStackUnwinder(int (*unwinder)(void** pcs, int* sizes, 
-                                             int max_depth, int skip_count, 
-                                             const void* uc, 
-                                             int* min_dropped_frames)); 
- 
-// DefaultStackUnwinder() 
-// 
-// Records program counter values of up to `max_depth` frames, skipping the most 
-// recent `skip_count` stack frames, and stores their corresponding values in 
-// `pcs`. (Note that the frame generated for this call itself is also skipped.) 
-// This function acts as a generic stack-unwinder; prefer usage of the more 
-// specific `GetStack{Trace,Frames}{,WithContext}()` functions above. 
-// 
-// If you have set your own stack unwinder (with the `SetStackUnwinder()` 
-// function above, you can still get the default stack unwinder by calling 
-// `DefaultStackUnwinder()`, which will ignore any previously set stack unwinder 
-// and use the default one instead. 
-// 
-// Because this function is generic, only `pcs` is guaranteed to be non-null 
-// upon return. It is legal for `sizes`, `uc`, and `min_dropped_frames` to all 
-// be null when called. 
-// 
-// The semantics are the same as the corresponding `GetStack*()` function in the 
+//
+// (a) The unwinder may be called from within signal handlers and
+// therefore must be async-signal-safe.
+//
+// (b) Even after a custom stack unwinder has been unregistered, other
+// threads may still be in the process of using that unwinder.
+// Therefore do not clean up any state that may be needed by an old
+// unwinder.
+// *****************************************************************************
+extern void SetStackUnwinder(int (*unwinder)(void** pcs, int* sizes,
+                                             int max_depth, int skip_count,
+                                             const void* uc,
+                                             int* min_dropped_frames));
+
+// DefaultStackUnwinder()
+//
+// Records program counter values of up to `max_depth` frames, skipping the most
+// recent `skip_count` stack frames, and stores their corresponding values in
+// `pcs`. (Note that the frame generated for this call itself is also skipped.)
+// This function acts as a generic stack-unwinder; prefer usage of the more
+// specific `GetStack{Trace,Frames}{,WithContext}()` functions above.
+//
+// If you have set your own stack unwinder (with the `SetStackUnwinder()`
+// function above, you can still get the default stack unwinder by calling
+// `DefaultStackUnwinder()`, which will ignore any previously set stack unwinder
+// and use the default one instead.
+//
+// Because this function is generic, only `pcs` is guaranteed to be non-null
+// upon return. It is legal for `sizes`, `uc`, and `min_dropped_frames` to all
+// be null when called.
+//
+// The semantics are the same as the corresponding `GetStack*()` function in the
 // case where `y_absl::SetStackUnwinder()` was never called. Equivalents are:
-// 
-//                       null sizes         |        non-nullptr sizes 
-//             |==========================================================| 
-//     null uc | GetStackTrace()            | GetStackFrames()            | 
-// non-null uc | GetStackTraceWithContext() | GetStackFramesWithContext() | 
-//             |==========================================================| 
-extern int DefaultStackUnwinder(void** pcs, int* sizes, int max_depth, 
-                                int skip_count, const void* uc, 
-                                int* min_dropped_frames); 
- 
-namespace debugging_internal { 
-// Returns true for platforms which are expected to have functioning stack trace 
-// implementations. Intended to be used for tests which want to exclude 
-// verification of logic known to be broken because stack traces are not 
-// working. 
-extern bool StackTraceWorksForTest(); 
-}  // namespace debugging_internal 
+//
+//                       null sizes         |        non-nullptr sizes
+//             |==========================================================|
+//     null uc | GetStackTrace()            | GetStackFrames()            |
+// non-null uc | GetStackTraceWithContext() | GetStackFramesWithContext() |
+//             |==========================================================|
+extern int DefaultStackUnwinder(void** pcs, int* sizes, int max_depth,
+                                int skip_count, const void* uc,
+                                int* min_dropped_frames);
+
+namespace debugging_internal {
+// Returns true for platforms which are expected to have functioning stack trace
+// implementations. Intended to be used for tests which want to exclude
+// verification of logic known to be broken because stack traces are not
+// working.
+extern bool StackTraceWorksForTest();
+}  // namespace debugging_internal
 ABSL_NAMESPACE_END
 }  // namespace y_absl
- 
-#endif  // ABSL_DEBUGGING_STACKTRACE_H_ 
+
+#endif  // ABSL_DEBUGGING_STACKTRACE_H_
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/stacktrace/ya.make b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/stacktrace/ya.make
index 1c8092cc83..a56bdc8a4c 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/stacktrace/ya.make
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/stacktrace/ya.make
@@ -1,32 +1,32 @@
-# Generated by devtools/yamaker. 
- 
-LIBRARY() 
- 
+# Generated by devtools/yamaker.
+
+LIBRARY()
+
 WITHOUT_LICENSE_TEXTS()
- 
+
 OWNER(
     somov
     g:cpp-contrib
 )
 
-LICENSE(Apache-2.0) 
- 
-PEERDIR( 
+LICENSE(Apache-2.0)
+
+PEERDIR(
     contrib/restricted/abseil-cpp-tstring/y_absl/base/internal/raw_logging
     contrib/restricted/abseil-cpp-tstring/y_absl/base/log_severity
     contrib/restricted/abseil-cpp-tstring/y_absl/debugging
-) 
- 
+)
+
 ADDINCL(
     GLOBAL contrib/restricted/abseil-cpp-tstring
 )
- 
-NO_COMPILER_WARNINGS() 
- 
+
+NO_COMPILER_WARNINGS()
+
 SRCDIR(contrib/restricted/abseil-cpp-tstring/y_absl/debugging)
- 
-SRCS( 
-    stacktrace.cc 
-) 
- 
-END() 
+
+SRCS(
+    stacktrace.cc
+)
+
+END()
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/symbolize.cc b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/symbolize.cc
index d5c2d42004..88c92a19ea 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/symbolize.cc
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/symbolize.cc
@@ -1,19 +1,19 @@
-// Copyright 2018 The Abseil Authors. 
-// 
-// Licensed under the Apache License, Version 2.0 (the "License"); 
-// you may not use this file except in compliance with the License. 
-// You may obtain a copy of the License at 
-// 
-//      https://www.apache.org/licenses/LICENSE-2.0 
-// 
-// Unless required by applicable law or agreed to in writing, software 
-// distributed under the License is distributed on an "AS IS" BASIS, 
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
-// See the License for the specific language governing permissions and 
-// limitations under the License. 
- 
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 #include "y_absl/debugging/symbolize.h"
- 
+
 #ifdef _WIN32
 #include <winapifamily.h>
 #if !(WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP)) || \
@@ -23,16 +23,16 @@
 #endif
 #endif
 
-#if defined(ABSL_INTERNAL_HAVE_ELF_SYMBOLIZE) 
+#if defined(ABSL_INTERNAL_HAVE_ELF_SYMBOLIZE)
 #include "y_absl/debugging/symbolize_elf.inc"
 #elif defined(ABSL_INTERNAL_HAVE_SYMBOLIZE_WIN32)
-// The Windows Symbolizer only works if PDB files containing the debug info 
-// are available to the program at runtime. 
+// The Windows Symbolizer only works if PDB files containing the debug info
+// are available to the program at runtime.
 #include "y_absl/debugging/symbolize_win32.inc"
 #elif defined(__APPLE__)
 #include "y_absl/debugging/symbolize_darwin.inc"
 #elif defined(__EMSCRIPTEN__)
 #include "y_absl/debugging/symbolize_emscripten.inc"
-#else 
+#else
 #include "y_absl/debugging/symbolize_unimplemented.inc"
-#endif 
+#endif
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/symbolize.h b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/symbolize.h
index b0c2543f3b..2a99f65c83 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/symbolize.h
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/symbolize.h
@@ -1,99 +1,99 @@
-// Copyright 2018 The Abseil Authors. 
-// 
-// Licensed under the Apache License, Version 2.0 (the "License"); 
-// you may not use this file except in compliance with the License. 
-// You may obtain a copy of the License at 
-// 
-//      https://www.apache.org/licenses/LICENSE-2.0 
-// 
-// Unless required by applicable law or agreed to in writing, software 
-// distributed under the License is distributed on an "AS IS" BASIS, 
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
-// See the License for the specific language governing permissions and 
-// limitations under the License. 
-// 
-// ----------------------------------------------------------------------------- 
-// File: symbolize.h 
-// ----------------------------------------------------------------------------- 
-// 
-// This file configures the Abseil symbolizer for use in converting instruction 
-// pointer addresses (program counters) into human-readable names (function 
-// calls, etc.) within Abseil code. 
-// 
-// The symbolizer may be invoked from several sources: 
-// 
-//   * Implicitly, through the installation of an Abseil failure signal handler. 
-//     (See failure_signal_handler.h for more information.) 
-//   * By calling `Symbolize()` directly on a program counter you obtain through 
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: symbolize.h
+// -----------------------------------------------------------------------------
+//
+// This file configures the Abseil symbolizer for use in converting instruction
+// pointer addresses (program counters) into human-readable names (function
+// calls, etc.) within Abseil code.
+//
+// The symbolizer may be invoked from several sources:
+//
+//   * Implicitly, through the installation of an Abseil failure signal handler.
+//     (See failure_signal_handler.h for more information.)
+//   * By calling `Symbolize()` directly on a program counter you obtain through
 //     `y_absl::GetStackTrace()` or `y_absl::GetStackFrames()`. (See stacktrace.h
-//     for more information. 
-//   * By calling `Symbolize()` directly on a program counter you obtain through 
-//     other means (which would be platform-dependent). 
-// 
-// In all of the above cases, the symbolizer must first be initialized before 
-// any program counter values can be symbolized. If you are installing a failure 
-// signal handler, initialize the symbolizer before you do so. 
-// 
-// Example: 
-// 
-//   int main(int argc, char** argv) { 
-//     // Initialize the Symbolizer before installing the failure signal handler 
+//     for more information.
+//   * By calling `Symbolize()` directly on a program counter you obtain through
+//     other means (which would be platform-dependent).
+//
+// In all of the above cases, the symbolizer must first be initialized before
+// any program counter values can be symbolized. If you are installing a failure
+// signal handler, initialize the symbolizer before you do so.
+//
+// Example:
+//
+//   int main(int argc, char** argv) {
+//     // Initialize the Symbolizer before installing the failure signal handler
 //     y_absl::InitializeSymbolizer(argv[0]);
-// 
-//     // Now you may install the failure signal handler 
+//
+//     // Now you may install the failure signal handler
 //     y_absl::FailureSignalHandlerOptions options;
 //     y_absl::InstallFailureSignalHandler(options);
-// 
-//     // Start running your main program 
-//     ... 
-//     return 0; 
-//  } 
-// 
-#ifndef ABSL_DEBUGGING_SYMBOLIZE_H_ 
-#define ABSL_DEBUGGING_SYMBOLIZE_H_ 
- 
+//
+//     // Start running your main program
+//     ...
+//     return 0;
+//  }
+//
+#ifndef ABSL_DEBUGGING_SYMBOLIZE_H_
+#define ABSL_DEBUGGING_SYMBOLIZE_H_
+
 #include "y_absl/debugging/internal/symbolize.h"
- 
+
 namespace y_absl {
 ABSL_NAMESPACE_BEGIN
- 
-// InitializeSymbolizer() 
-// 
-// Initializes the program counter symbolizer, given the path of the program 
-// (typically obtained through `main()`s `argv[0]`). The Abseil symbolizer 
-// allows you to read program counters (instruction pointer values) using their 
-// human-readable names within output such as stack traces. 
-// 
-// Example: 
-// 
-// int main(int argc, char *argv[]) { 
+
+// InitializeSymbolizer()
+//
+// Initializes the program counter symbolizer, given the path of the program
+// (typically obtained through `main()`s `argv[0]`). The Abseil symbolizer
+// allows you to read program counters (instruction pointer values) using their
+// human-readable names within output such as stack traces.
+//
+// Example:
+//
+// int main(int argc, char *argv[]) {
 //   y_absl::InitializeSymbolizer(argv[0]);
-//   // Now you can use the symbolizer 
-// } 
-void InitializeSymbolizer(const char* argv0); 
-//
-// Symbolize() 
-// 
-// Symbolizes a program counter (instruction pointer value) `pc` and, on 
-// success, writes the name to `out`. The symbol name is demangled, if possible. 
-// Note that the symbolized name may be truncated and will be NUL-terminated. 
-// Demangling is supported for symbols generated by GCC 3.x or newer). Returns 
-// `false` on failure. 
-// 
-// Example: 
-// 
-//   // Print a program counter and its symbol name. 
-//   static void DumpPCAndSymbol(void *pc) { 
-//     char tmp[1024]; 
-//     const char *symbol = "(unknown)"; 
+//   // Now you can use the symbolizer
+// }
+void InitializeSymbolizer(const char* argv0);
+//
+// Symbolize()
+//
+// Symbolizes a program counter (instruction pointer value) `pc` and, on
+// success, writes the name to `out`. The symbol name is demangled, if possible.
+// Note that the symbolized name may be truncated and will be NUL-terminated.
+// Demangling is supported for symbols generated by GCC 3.x or newer). Returns
+// `false` on failure.
+//
+// Example:
+//
+//   // Print a program counter and its symbol name.
+//   static void DumpPCAndSymbol(void *pc) {
+//     char tmp[1024];
+//     const char *symbol = "(unknown)";
 //     if (y_absl::Symbolize(pc, tmp, sizeof(tmp))) {
-//       symbol = tmp; 
-//     } 
+//       symbol = tmp;
+//     }
 //     y_absl::PrintF("%p  %s\n", pc, symbol);
-//  } 
-bool Symbolize(const void *pc, char *out, int out_size); 
- 
+//  }
+bool Symbolize(const void *pc, char *out, int out_size);
+
 ABSL_NAMESPACE_END
 }  // namespace y_absl
- 
-#endif  // ABSL_DEBUGGING_SYMBOLIZE_H_ 
+
+#endif  // ABSL_DEBUGGING_SYMBOLIZE_H_
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/symbolize/ya.make b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/symbolize/ya.make
index 8a0b5de314..58f9d70682 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/symbolize/ya.make
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/symbolize/ya.make
@@ -1,17 +1,17 @@
-# Generated by devtools/yamaker. 
- 
-LIBRARY() 
- 
+# Generated by devtools/yamaker.
+
+LIBRARY()
+
 WITHOUT_LICENSE_TEXTS()
- 
+
 OWNER(
     somov
     g:cpp-contrib
 )
 
-LICENSE(Apache-2.0) 
- 
-PEERDIR( 
+LICENSE(Apache-2.0)
+
+PEERDIR(
     contrib/restricted/abseil-cpp-tstring/y_absl/base
     contrib/restricted/abseil-cpp-tstring/y_absl/base/internal/low_level_alloc
     contrib/restricted/abseil-cpp-tstring/y_absl/base/internal/raw_logging
@@ -23,18 +23,18 @@ PEERDIR(
     contrib/restricted/abseil-cpp-tstring/y_absl/numeric
     contrib/restricted/abseil-cpp-tstring/y_absl/strings
     contrib/restricted/abseil-cpp-tstring/y_absl/strings/internal/absl_strings_internal
-) 
- 
+)
+
 ADDINCL(
     GLOBAL contrib/restricted/abseil-cpp-tstring
 )
- 
-NO_COMPILER_WARNINGS() 
- 
+
+NO_COMPILER_WARNINGS()
+
 SRCDIR(contrib/restricted/abseil-cpp-tstring/y_absl/debugging)
- 
-SRCS( 
-    symbolize.cc 
-) 
- 
-END() 
+
+SRCS(
+    symbolize.cc
+)
+
+END()
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/symbolize_elf.inc b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/symbolize_elf.inc
index ed073a1114..18297405e3 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/symbolize_elf.inc
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/symbolize_elf.inc
@@ -1,72 +1,72 @@
-// Copyright 2018 The Abseil Authors. 
-// 
-// Licensed under the Apache License, Version 2.0 (the "License"); 
-// you may not use this file except in compliance with the License. 
-// You may obtain a copy of the License at 
-// 
-//      https://www.apache.org/licenses/LICENSE-2.0 
-// 
-// Unless required by applicable law or agreed to in writing, software 
-// distributed under the License is distributed on an "AS IS" BASIS, 
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
-// See the License for the specific language governing permissions and 
-// limitations under the License. 
- 
-// This library provides Symbolize() function that symbolizes program 
-// counters to their corresponding symbol names on linux platforms. 
-// This library has a minimal implementation of an ELF symbol table 
-// reader (i.e. it doesn't depend on libelf, etc.). 
-// 
-// The algorithm used in Symbolize() is as follows. 
-// 
-//   1. Go through a list of maps in /proc/self/maps and find the map 
-//   containing the program counter. 
-// 
-//   2. Open the mapped file and find a regular symbol table inside. 
-//   Iterate over symbols in the symbol table and look for the symbol 
-//   containing the program counter.  If such a symbol is found, 
-//   obtain the symbol name, and demangle the symbol if possible. 
-//   If the symbol isn't found in the regular symbol table (binary is 
-//   stripped), try the same thing with a dynamic symbol table. 
-// 
-// Note that Symbolize() is originally implemented to be used in 
-// signal handlers, hence it doesn't use malloc() and other unsafe 
-// operations.  It should be both thread-safe and async-signal-safe. 
-// 
-// Implementation note: 
-// 
-// We don't use heaps but only use stacks.  We want to reduce the 
-// stack consumption so that the symbolizer can run on small stacks. 
-// 
-// Here are some numbers collected with GCC 4.1.0 on x86: 
-// - sizeof(Elf32_Sym)  = 16 
-// - sizeof(Elf32_Shdr) = 40 
-// - sizeof(Elf64_Sym)  = 24 
-// - sizeof(Elf64_Shdr) = 64 
-// 
-// This implementation is intended to be async-signal-safe but uses some 
-// functions which are not guaranteed to be so, such as memchr() and 
-// memmove().  We assume they are async-signal-safe. 
- 
-#include <dlfcn.h> 
-#include <elf.h> 
-#include <fcntl.h> 
-#include <link.h>  // For ElfW() macro. 
-#include <sys/stat.h> 
-#include <sys/types.h> 
-#include <unistd.h> 
- 
-#include <algorithm> 
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// This library provides Symbolize() function that symbolizes program
+// counters to their corresponding symbol names on linux platforms.
+// This library has a minimal implementation of an ELF symbol table
+// reader (i.e. it doesn't depend on libelf, etc.).
+//
+// The algorithm used in Symbolize() is as follows.
+//
+//   1. Go through a list of maps in /proc/self/maps and find the map
+//   containing the program counter.
+//
+//   2. Open the mapped file and find a regular symbol table inside.
+//   Iterate over symbols in the symbol table and look for the symbol
+//   containing the program counter.  If such a symbol is found,
+//   obtain the symbol name, and demangle the symbol if possible.
+//   If the symbol isn't found in the regular symbol table (binary is
+//   stripped), try the same thing with a dynamic symbol table.
+//
+// Note that Symbolize() is originally implemented to be used in
+// signal handlers, hence it doesn't use malloc() and other unsafe
+// operations.  It should be both thread-safe and async-signal-safe.
+//
+// Implementation note:
+//
+// We don't use heaps but only use stacks.  We want to reduce the
+// stack consumption so that the symbolizer can run on small stacks.
+//
+// Here are some numbers collected with GCC 4.1.0 on x86:
+// - sizeof(Elf32_Sym)  = 16
+// - sizeof(Elf32_Shdr) = 40
+// - sizeof(Elf64_Sym)  = 24
+// - sizeof(Elf64_Shdr) = 64
+//
+// This implementation is intended to be async-signal-safe but uses some
+// functions which are not guaranteed to be so, such as memchr() and
+// memmove().  We assume they are async-signal-safe.
+
+#include <dlfcn.h>
+#include <elf.h>
+#include <fcntl.h>
+#include <link.h>  // For ElfW() macro.
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <algorithm>
 #include <array>
-#include <atomic> 
-#include <cerrno> 
-#include <cinttypes> 
-#include <climits> 
-#include <cstdint> 
-#include <cstdio> 
-#include <cstdlib> 
-#include <cstring> 
- 
+#include <atomic>
+#include <cerrno>
+#include <cinttypes>
+#include <climits>
+#include <cstdint>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+
 #include "y_absl/base/casts.h"
 #include "y_absl/base/dynamic_annotations.h"
 #include "y_absl/base/internal/low_level_alloc.h"
@@ -76,635 +76,635 @@
 #include "y_absl/debugging/internal/demangle.h"
 #include "y_absl/debugging/internal/vdso_support.h"
 #include "y_absl/strings/string_view.h"
- 
+
 #if defined(__FreeBSD__) && !defined(ElfW)
 #define ElfW(x) __ElfN(x)
 #endif
 
 namespace y_absl {
 ABSL_NAMESPACE_BEGIN
- 
-// Value of argv[0]. Used by MaybeInitializeObjFile(). 
-static char *argv0_value = nullptr; 
- 
-void InitializeSymbolizer(const char *argv0) { 
+
+// Value of argv[0]. Used by MaybeInitializeObjFile().
+static char *argv0_value = nullptr;
+
+void InitializeSymbolizer(const char *argv0) {
 #ifdef ABSL_HAVE_VDSO_SUPPORT
   // We need to make sure VDSOSupport::Init() is called before any setuid or
   // chroot calls, so InitializeSymbolizer() should be called very early in the
   // life of a program.
   y_absl::debugging_internal::VDSOSupport::Init();
 #endif
-  if (argv0_value != nullptr) { 
-    free(argv0_value); 
-    argv0_value = nullptr; 
-  } 
-  if (argv0 != nullptr && argv0[0] != '\0') { 
-    argv0_value = strdup(argv0); 
-  } 
-} 
- 
-namespace debugging_internal { 
-namespace { 
- 
-// Re-runs fn until it doesn't cause EINTR. 
-#define NO_INTR(fn) \ 
-  do {              \ 
-  } while ((fn) < 0 && errno == EINTR) 
- 
-// On Linux, ELF_ST_* are defined in <linux/elf.h>.  To make this portable 
-// we define our own ELF_ST_BIND and ELF_ST_TYPE if not available. 
-#ifndef ELF_ST_BIND 
-#define ELF_ST_BIND(info) (((unsigned char)(info)) >> 4) 
-#endif 
- 
-#ifndef ELF_ST_TYPE 
-#define ELF_ST_TYPE(info) (((unsigned char)(info)) & 0xF) 
-#endif 
- 
-// Some platforms use a special .opd section to store function pointers. 
-const char kOpdSectionName[] = ".opd"; 
- 
-#if (defined(__powerpc__) && !(_CALL_ELF > 1)) || defined(__ia64) 
-// Use opd section for function descriptors on these platforms, the function 
-// address is the first word of the descriptor. 
-enum { kPlatformUsesOPDSections = 1 }; 
-#else  // not PPC or IA64 
-enum { kPlatformUsesOPDSections = 0 }; 
-#endif 
- 
-// This works for PowerPC & IA64 only.  A function descriptor consist of two 
-// pointers and the first one is the function's entry. 
-const size_t kFunctionDescriptorSize = sizeof(void *) * 2; 
- 
-const int kMaxDecorators = 10;  // Seems like a reasonable upper limit. 
- 
-struct InstalledSymbolDecorator { 
-  SymbolDecorator fn; 
-  void *arg; 
-  int ticket; 
-}; 
- 
-int g_num_decorators; 
-InstalledSymbolDecorator g_decorators[kMaxDecorators]; 
- 
-struct FileMappingHint { 
-  const void *start; 
-  const void *end; 
-  uint64_t offset; 
-  const char *filename; 
-}; 
- 
-// Protects g_decorators. 
-// We are using SpinLock and not a Mutex here, because we may be called 
-// from inside Mutex::Lock itself, and it prohibits recursive calls. 
-// This happens in e.g. base/stacktrace_syscall_unittest. 
-// Moreover, we are using only TryLock(), if the decorator list 
-// is being modified (is busy), we skip all decorators, and possibly 
-// loose some info. Sorry, that's the best we could do. 
+  if (argv0_value != nullptr) {
+    free(argv0_value);
+    argv0_value = nullptr;
+  }
+  if (argv0 != nullptr && argv0[0] != '\0') {
+    argv0_value = strdup(argv0);
+  }
+}
+
+namespace debugging_internal {
+namespace {
+
+// Re-runs fn until it doesn't cause EINTR.
+#define NO_INTR(fn) \
+  do {              \
+  } while ((fn) < 0 && errno == EINTR)
+
+// On Linux, ELF_ST_* are defined in <linux/elf.h>.  To make this portable
+// we define our own ELF_ST_BIND and ELF_ST_TYPE if not available.
+#ifndef ELF_ST_BIND
+#define ELF_ST_BIND(info) (((unsigned char)(info)) >> 4)
+#endif
+
+#ifndef ELF_ST_TYPE
+#define ELF_ST_TYPE(info) (((unsigned char)(info)) & 0xF)
+#endif
+
+// Some platforms use a special .opd section to store function pointers.
+const char kOpdSectionName[] = ".opd";
+
+#if (defined(__powerpc__) && !(_CALL_ELF > 1)) || defined(__ia64)
+// Use opd section for function descriptors on these platforms, the function
+// address is the first word of the descriptor.
+enum { kPlatformUsesOPDSections = 1 };
+#else  // not PPC or IA64
+enum { kPlatformUsesOPDSections = 0 };
+#endif
+
+// This works for PowerPC & IA64 only.  A function descriptor consist of two
+// pointers and the first one is the function's entry.
+const size_t kFunctionDescriptorSize = sizeof(void *) * 2;
+
+const int kMaxDecorators = 10;  // Seems like a reasonable upper limit.
+
+struct InstalledSymbolDecorator {
+  SymbolDecorator fn;
+  void *arg;
+  int ticket;
+};
+
+int g_num_decorators;
+InstalledSymbolDecorator g_decorators[kMaxDecorators];
+
+struct FileMappingHint {
+  const void *start;
+  const void *end;
+  uint64_t offset;
+  const char *filename;
+};
+
+// Protects g_decorators.
+// We are using SpinLock and not a Mutex here, because we may be called
+// from inside Mutex::Lock itself, and it prohibits recursive calls.
+// This happens in e.g. base/stacktrace_syscall_unittest.
+// Moreover, we are using only TryLock(), if the decorator list
+// is being modified (is busy), we skip all decorators, and possibly
+// loose some info. Sorry, that's the best we could do.
 ABSL_CONST_INIT y_absl::base_internal::SpinLock g_decorators_mu(
     y_absl::kConstInit, y_absl::base_internal::SCHEDULE_KERNEL_ONLY);
- 
-const int kMaxFileMappingHints = 8; 
-int g_num_file_mapping_hints; 
-FileMappingHint g_file_mapping_hints[kMaxFileMappingHints]; 
-// Protects g_file_mapping_hints. 
+
+const int kMaxFileMappingHints = 8;
+int g_num_file_mapping_hints;
+FileMappingHint g_file_mapping_hints[kMaxFileMappingHints];
+// Protects g_file_mapping_hints.
 ABSL_CONST_INIT y_absl::base_internal::SpinLock g_file_mapping_mu(
     y_absl::kConstInit, y_absl::base_internal::SCHEDULE_KERNEL_ONLY);
- 
-// Async-signal-safe function to zero a buffer. 
-// memset() is not guaranteed to be async-signal-safe. 
-static void SafeMemZero(void* p, size_t size) { 
-  unsigned char *c = static_cast<unsigned char *>(p); 
-  while (size--) { 
-    *c++ = 0; 
-  } 
-} 
- 
-struct ObjFile { 
-  ObjFile() 
-      : filename(nullptr), 
-        start_addr(nullptr), 
-        end_addr(nullptr), 
-        offset(0), 
-        fd(-1), 
-        elf_type(-1) { 
-    SafeMemZero(&elf_header, sizeof(elf_header)); 
+
+// Async-signal-safe function to zero a buffer.
+// memset() is not guaranteed to be async-signal-safe.
+static void SafeMemZero(void* p, size_t size) {
+  unsigned char *c = static_cast<unsigned char *>(p);
+  while (size--) {
+    *c++ = 0;
+  }
+}
+
+struct ObjFile {
+  ObjFile()
+      : filename(nullptr),
+        start_addr(nullptr),
+        end_addr(nullptr),
+        offset(0),
+        fd(-1),
+        elf_type(-1) {
+    SafeMemZero(&elf_header, sizeof(elf_header));
     SafeMemZero(&phdr[0], sizeof(phdr));
-  } 
- 
-  char *filename; 
-  const void *start_addr; 
-  const void *end_addr; 
-  uint64_t offset; 
- 
-  // The following fields are initialized on the first access to the 
-  // object file. 
-  int fd; 
-  int elf_type; 
-  ElfW(Ehdr) elf_header; 
+  }
+
+  char *filename;
+  const void *start_addr;
+  const void *end_addr;
+  uint64_t offset;
+
+  // The following fields are initialized on the first access to the
+  // object file.
+  int fd;
+  int elf_type;
+  ElfW(Ehdr) elf_header;
 
   // PT_LOAD program header describing executable code.
   // Normally we expect just one, but SWIFT binaries have two.
   std::array<ElfW(Phdr), 2> phdr;
-}; 
- 
-// Build 4-way associative cache for symbols. Within each cache line, symbols 
-// are replaced in LRU order. 
-enum { 
-  ASSOCIATIVITY = 4, 
-}; 
-struct SymbolCacheLine { 
-  const void *pc[ASSOCIATIVITY]; 
-  char *name[ASSOCIATIVITY]; 
- 
-  // age[i] is incremented when a line is accessed. it's reset to zero if the 
-  // i'th entry is read. 
-  uint32_t age[ASSOCIATIVITY]; 
-}; 
- 
-// --------------------------------------------------------------- 
-// An async-signal-safe arena for LowLevelAlloc 
-static std::atomic<base_internal::LowLevelAlloc::Arena *> g_sig_safe_arena; 
- 
-static base_internal::LowLevelAlloc::Arena *SigSafeArena() { 
-  return g_sig_safe_arena.load(std::memory_order_acquire); 
-} 
- 
-static void InitSigSafeArena() { 
-  if (SigSafeArena() == nullptr) { 
-    base_internal::LowLevelAlloc::Arena *new_arena = 
-        base_internal::LowLevelAlloc::NewArena( 
-            base_internal::LowLevelAlloc::kAsyncSignalSafe); 
-    base_internal::LowLevelAlloc::Arena *old_value = nullptr; 
-    if (!g_sig_safe_arena.compare_exchange_strong(old_value, new_arena, 
-                                                  std::memory_order_release, 
-                                                  std::memory_order_relaxed)) { 
-      // We lost a race to allocate an arena; deallocate. 
-      base_internal::LowLevelAlloc::DeleteArena(new_arena); 
-    } 
-  } 
-} 
- 
-// --------------------------------------------------------------- 
-// An AddrMap is a vector of ObjFile, using SigSafeArena() for allocation. 
- 
-class AddrMap { 
- public: 
-  AddrMap() : size_(0), allocated_(0), obj_(nullptr) {} 
-  ~AddrMap() { base_internal::LowLevelAlloc::Free(obj_); } 
-  int Size() const { return size_; } 
-  ObjFile *At(int i) { return &obj_[i]; } 
-  ObjFile *Add(); 
-  void Clear(); 
- 
- private: 
-  int size_;       // count of valid elements (<= allocated_) 
-  int allocated_;  // count of allocated elements 
-  ObjFile *obj_;   // array of allocated_ elements 
-  AddrMap(const AddrMap &) = delete; 
-  AddrMap &operator=(const AddrMap &) = delete; 
-}; 
- 
-void AddrMap::Clear() { 
-  for (int i = 0; i != size_; i++) { 
-    At(i)->~ObjFile(); 
-  } 
-  size_ = 0; 
-} 
- 
-ObjFile *AddrMap::Add() { 
-  if (size_ == allocated_) { 
-    int new_allocated = allocated_ * 2 + 50; 
-    ObjFile *new_obj_ = 
-        static_cast<ObjFile *>(base_internal::LowLevelAlloc::AllocWithArena( 
-            new_allocated * sizeof(*new_obj_), SigSafeArena())); 
-    if (obj_) { 
-      memcpy(new_obj_, obj_, allocated_ * sizeof(*new_obj_)); 
-      base_internal::LowLevelAlloc::Free(obj_); 
-    } 
-    obj_ = new_obj_; 
-    allocated_ = new_allocated; 
-  } 
-  return new (&obj_[size_++]) ObjFile; 
-} 
- 
-// --------------------------------------------------------------- 
- 
-enum FindSymbolResult { SYMBOL_NOT_FOUND = 1, SYMBOL_TRUNCATED, SYMBOL_FOUND }; 
- 
-class Symbolizer { 
- public: 
-  Symbolizer(); 
-  ~Symbolizer(); 
-  const char *GetSymbol(const void *const pc); 
- 
- private: 
-  char *CopyString(const char *s) { 
-    int len = strlen(s); 
-    char *dst = static_cast<char *>( 
-        base_internal::LowLevelAlloc::AllocWithArena(len + 1, SigSafeArena())); 
-    ABSL_RAW_CHECK(dst != nullptr, "out of memory"); 
-    memcpy(dst, s, len + 1); 
-    return dst; 
-  } 
-  ObjFile *FindObjFile(const void *const start, 
-                       size_t size) ABSL_ATTRIBUTE_NOINLINE; 
-  static bool RegisterObjFile(const char *filename, 
-                              const void *const start_addr, 
-                              const void *const end_addr, uint64_t offset, 
-                              void *arg); 
-  SymbolCacheLine *GetCacheLine(const void *const pc); 
-  const char *FindSymbolInCache(const void *const pc); 
-  const char *InsertSymbolInCache(const void *const pc, const char *name); 
-  void AgeSymbols(SymbolCacheLine *line); 
-  void ClearAddrMap(); 
-  FindSymbolResult GetSymbolFromObjectFile(const ObjFile &obj, 
-                                           const void *const pc, 
-                                           const ptrdiff_t relocation, 
-                                           char *out, int out_size, 
-                                           char *tmp_buf, int tmp_buf_size); 
- 
-  enum { 
-    SYMBOL_BUF_SIZE = 3072, 
-    TMP_BUF_SIZE = 1024, 
-    SYMBOL_CACHE_LINES = 128, 
-  }; 
- 
-  AddrMap addr_map_; 
- 
-  bool ok_; 
-  bool addr_map_read_; 
- 
-  char symbol_buf_[SYMBOL_BUF_SIZE]; 
- 
-  // tmp_buf_ will be used to store arrays of ElfW(Shdr) and ElfW(Sym) 
-  // so we ensure that tmp_buf_ is properly aligned to store either. 
-  alignas(16) char tmp_buf_[TMP_BUF_SIZE]; 
-  static_assert(alignof(ElfW(Shdr)) <= 16, 
-                "alignment of tmp buf too small for Shdr"); 
-  static_assert(alignof(ElfW(Sym)) <= 16, 
-                "alignment of tmp buf too small for Sym"); 
- 
-  SymbolCacheLine symbol_cache_[SYMBOL_CACHE_LINES]; 
-}; 
- 
-static std::atomic<Symbolizer *> g_cached_symbolizer; 
- 
-}  // namespace 
- 
-static int SymbolizerSize() { 
-#if defined(__wasm__) || defined(__asmjs__) 
-  int pagesize = getpagesize(); 
-#else 
-  int pagesize = sysconf(_SC_PAGESIZE); 
-#endif 
-  return ((sizeof(Symbolizer) - 1) / pagesize + 1) * pagesize; 
-} 
- 
-// Return (and set null) g_cached_symbolized_state if it is not null. 
-// Otherwise return a new symbolizer. 
-static Symbolizer *AllocateSymbolizer() { 
-  InitSigSafeArena(); 
-  Symbolizer *symbolizer = 
-      g_cached_symbolizer.exchange(nullptr, std::memory_order_acquire); 
-  if (symbolizer != nullptr) { 
-    return symbolizer; 
-  } 
-  return new (base_internal::LowLevelAlloc::AllocWithArena( 
-      SymbolizerSize(), SigSafeArena())) Symbolizer(); 
-} 
- 
-// Set g_cached_symbolize_state to s if it is null, otherwise 
-// delete s. 
-static void FreeSymbolizer(Symbolizer *s) { 
-  Symbolizer *old_cached_symbolizer = nullptr; 
-  if (!g_cached_symbolizer.compare_exchange_strong(old_cached_symbolizer, s, 
-                                                   std::memory_order_release, 
-                                                   std::memory_order_relaxed)) { 
-    s->~Symbolizer(); 
-    base_internal::LowLevelAlloc::Free(s); 
-  } 
-} 
- 
-Symbolizer::Symbolizer() : ok_(true), addr_map_read_(false) { 
-  for (SymbolCacheLine &symbol_cache_line : symbol_cache_) { 
-    for (size_t j = 0; j < ABSL_ARRAYSIZE(symbol_cache_line.name); ++j) { 
-      symbol_cache_line.pc[j] = nullptr; 
-      symbol_cache_line.name[j] = nullptr; 
-      symbol_cache_line.age[j] = 0; 
-    } 
-  } 
-} 
- 
-Symbolizer::~Symbolizer() { 
-  for (SymbolCacheLine &symbol_cache_line : symbol_cache_) { 
-    for (char *s : symbol_cache_line.name) { 
-      base_internal::LowLevelAlloc::Free(s); 
-    } 
-  } 
-  ClearAddrMap(); 
-} 
- 
-// We don't use assert() since it's not guaranteed to be 
-// async-signal-safe.  Instead we define a minimal assertion 
-// macro. So far, we don't need pretty printing for __FILE__, etc. 
-#define SAFE_ASSERT(expr) ((expr) ? static_cast<void>(0) : abort()) 
- 
-// Read up to "count" bytes from file descriptor "fd" into the buffer 
-// starting at "buf" while handling short reads and EINTR.  On 
-// success, return the number of bytes read.  Otherwise, return -1. 
-static ssize_t ReadPersistent(int fd, void *buf, size_t count) { 
-  SAFE_ASSERT(fd >= 0); 
-  SAFE_ASSERT(count <= SSIZE_MAX); 
-  char *buf0 = reinterpret_cast<char *>(buf); 
-  size_t num_bytes = 0; 
-  while (num_bytes < count) { 
-    ssize_t len; 
-    NO_INTR(len = read(fd, buf0 + num_bytes, count - num_bytes)); 
-    if (len < 0) {  // There was an error other than EINTR. 
-      ABSL_RAW_LOG(WARNING, "read failed: errno=%d", errno); 
-      return -1; 
-    } 
-    if (len == 0) {  // Reached EOF. 
-      break; 
-    } 
-    num_bytes += len; 
-  } 
-  SAFE_ASSERT(num_bytes <= count); 
-  return static_cast<ssize_t>(num_bytes); 
-} 
- 
-// Read up to "count" bytes from "offset" in the file pointed by file 
-// descriptor "fd" into the buffer starting at "buf".  On success, 
-// return the number of bytes read.  Otherwise, return -1. 
-static ssize_t ReadFromOffset(const int fd, void *buf, const size_t count, 
-                              const off_t offset) { 
-  off_t off = lseek(fd, offset, SEEK_SET); 
-  if (off == (off_t)-1) { 
-    ABSL_RAW_LOG(WARNING, "lseek(%d, %ju, SEEK_SET) failed: errno=%d", fd, 
-                 static_cast<uintmax_t>(offset), errno); 
-    return -1; 
-  } 
-  return ReadPersistent(fd, buf, count); 
-} 
- 
-// Try reading exactly "count" bytes from "offset" bytes in a file 
-// pointed by "fd" into the buffer starting at "buf" while handling 
-// short reads and EINTR.  On success, return true. Otherwise, return 
-// false. 
-static bool ReadFromOffsetExact(const int fd, void *buf, const size_t count, 
-                                const off_t offset) { 
-  ssize_t len = ReadFromOffset(fd, buf, count, offset); 
-  return len >= 0 && static_cast<size_t>(len) == count; 
-} 
- 
-// Returns elf_header.e_type if the file pointed by fd is an ELF binary. 
-static int FileGetElfType(const int fd) { 
-  ElfW(Ehdr) elf_header; 
-  if (!ReadFromOffsetExact(fd, &elf_header, sizeof(elf_header), 0)) { 
-    return -1; 
-  } 
-  if (memcmp(elf_header.e_ident, ELFMAG, SELFMAG) != 0) { 
-    return -1; 
-  } 
-  return elf_header.e_type; 
-} 
- 
-// Read the section headers in the given ELF binary, and if a section 
-// of the specified type is found, set the output to this section header 
-// and return true.  Otherwise, return false. 
-// To keep stack consumption low, we would like this function to not get 
-// inlined. 
-static ABSL_ATTRIBUTE_NOINLINE bool GetSectionHeaderByType( 
-    const int fd, ElfW(Half) sh_num, const off_t sh_offset, ElfW(Word) type, 
-    ElfW(Shdr) * out, char *tmp_buf, int tmp_buf_size) { 
-  ElfW(Shdr) *buf = reinterpret_cast<ElfW(Shdr) *>(tmp_buf); 
-  const int buf_entries = tmp_buf_size / sizeof(buf[0]); 
-  const int buf_bytes = buf_entries * sizeof(buf[0]); 
- 
-  for (int i = 0; i < sh_num;) { 
-    const ssize_t num_bytes_left = (sh_num - i) * sizeof(buf[0]); 
-    const ssize_t num_bytes_to_read = 
-        (buf_bytes > num_bytes_left) ? num_bytes_left : buf_bytes; 
-    const off_t offset = sh_offset + i * sizeof(buf[0]); 
-    const ssize_t len = ReadFromOffset(fd, buf, num_bytes_to_read, offset); 
-    if (len % sizeof(buf[0]) != 0) { 
-      ABSL_RAW_LOG( 
-          WARNING, 
-          "Reading %zd bytes from offset %ju returned %zd which is not a " 
-          "multiple of %zu.", 
-          num_bytes_to_read, static_cast<uintmax_t>(offset), len, 
-          sizeof(buf[0])); 
-      return false; 
-    } 
-    const ssize_t num_headers_in_buf = len / sizeof(buf[0]); 
-    SAFE_ASSERT(num_headers_in_buf <= buf_entries); 
-    for (int j = 0; j < num_headers_in_buf; ++j) { 
-      if (buf[j].sh_type == type) { 
-        *out = buf[j]; 
-        return true; 
-      } 
-    } 
-    i += num_headers_in_buf; 
-  } 
-  return false; 
-} 
- 
-// There is no particular reason to limit section name to 63 characters, 
-// but there has (as yet) been no need for anything longer either. 
-const int kMaxSectionNameLen = 64; 
- 
-bool ForEachSection(int fd, 
+};
+
+// Build 4-way associative cache for symbols. Within each cache line, symbols
+// are replaced in LRU order.
+enum {
+  ASSOCIATIVITY = 4,
+};
+struct SymbolCacheLine {
+  const void *pc[ASSOCIATIVITY];
+  char *name[ASSOCIATIVITY];
+
+  // age[i] is incremented when a line is accessed. it's reset to zero if the
+  // i'th entry is read.
+  uint32_t age[ASSOCIATIVITY];
+};
+
+// ---------------------------------------------------------------
+// An async-signal-safe arena for LowLevelAlloc
+static std::atomic<base_internal::LowLevelAlloc::Arena *> g_sig_safe_arena;
+
+static base_internal::LowLevelAlloc::Arena *SigSafeArena() {
+  return g_sig_safe_arena.load(std::memory_order_acquire);
+}
+
+static void InitSigSafeArena() {
+  if (SigSafeArena() == nullptr) {
+    base_internal::LowLevelAlloc::Arena *new_arena =
+        base_internal::LowLevelAlloc::NewArena(
+            base_internal::LowLevelAlloc::kAsyncSignalSafe);
+    base_internal::LowLevelAlloc::Arena *old_value = nullptr;
+    if (!g_sig_safe_arena.compare_exchange_strong(old_value, new_arena,
+                                                  std::memory_order_release,
+                                                  std::memory_order_relaxed)) {
+      // We lost a race to allocate an arena; deallocate.
+      base_internal::LowLevelAlloc::DeleteArena(new_arena);
+    }
+  }
+}
+
+// ---------------------------------------------------------------
+// An AddrMap is a vector of ObjFile, using SigSafeArena() for allocation.
+
+class AddrMap {
+ public:
+  AddrMap() : size_(0), allocated_(0), obj_(nullptr) {}
+  ~AddrMap() { base_internal::LowLevelAlloc::Free(obj_); }
+  int Size() const { return size_; }
+  ObjFile *At(int i) { return &obj_[i]; }
+  ObjFile *Add();
+  void Clear();
+
+ private:
+  int size_;       // count of valid elements (<= allocated_)
+  int allocated_;  // count of allocated elements
+  ObjFile *obj_;   // array of allocated_ elements
+  AddrMap(const AddrMap &) = delete;
+  AddrMap &operator=(const AddrMap &) = delete;
+};
+
+void AddrMap::Clear() {
+  for (int i = 0; i != size_; i++) {
+    At(i)->~ObjFile();
+  }
+  size_ = 0;
+}
+
+ObjFile *AddrMap::Add() {
+  if (size_ == allocated_) {
+    int new_allocated = allocated_ * 2 + 50;
+    ObjFile *new_obj_ =
+        static_cast<ObjFile *>(base_internal::LowLevelAlloc::AllocWithArena(
+            new_allocated * sizeof(*new_obj_), SigSafeArena()));
+    if (obj_) {
+      memcpy(new_obj_, obj_, allocated_ * sizeof(*new_obj_));
+      base_internal::LowLevelAlloc::Free(obj_);
+    }
+    obj_ = new_obj_;
+    allocated_ = new_allocated;
+  }
+  return new (&obj_[size_++]) ObjFile;
+}
+
+// ---------------------------------------------------------------
+
+enum FindSymbolResult { SYMBOL_NOT_FOUND = 1, SYMBOL_TRUNCATED, SYMBOL_FOUND };
+
+class Symbolizer {
+ public:
+  Symbolizer();
+  ~Symbolizer();
+  const char *GetSymbol(const void *const pc);
+
+ private:
+  char *CopyString(const char *s) {
+    int len = strlen(s);
+    char *dst = static_cast<char *>(
+        base_internal::LowLevelAlloc::AllocWithArena(len + 1, SigSafeArena()));
+    ABSL_RAW_CHECK(dst != nullptr, "out of memory");
+    memcpy(dst, s, len + 1);
+    return dst;
+  }
+  ObjFile *FindObjFile(const void *const start,
+                       size_t size) ABSL_ATTRIBUTE_NOINLINE;
+  static bool RegisterObjFile(const char *filename,
+                              const void *const start_addr,
+                              const void *const end_addr, uint64_t offset,
+                              void *arg);
+  SymbolCacheLine *GetCacheLine(const void *const pc);
+  const char *FindSymbolInCache(const void *const pc);
+  const char *InsertSymbolInCache(const void *const pc, const char *name);
+  void AgeSymbols(SymbolCacheLine *line);
+  void ClearAddrMap();
+  FindSymbolResult GetSymbolFromObjectFile(const ObjFile &obj,
+                                           const void *const pc,
+                                           const ptrdiff_t relocation,
+                                           char *out, int out_size,
+                                           char *tmp_buf, int tmp_buf_size);
+
+  enum {
+    SYMBOL_BUF_SIZE = 3072,
+    TMP_BUF_SIZE = 1024,
+    SYMBOL_CACHE_LINES = 128,
+  };
+
+  AddrMap addr_map_;
+
+  bool ok_;
+  bool addr_map_read_;
+
+  char symbol_buf_[SYMBOL_BUF_SIZE];
+
+  // tmp_buf_ will be used to store arrays of ElfW(Shdr) and ElfW(Sym)
+  // so we ensure that tmp_buf_ is properly aligned to store either.
+  alignas(16) char tmp_buf_[TMP_BUF_SIZE];
+  static_assert(alignof(ElfW(Shdr)) <= 16,
+                "alignment of tmp buf too small for Shdr");
+  static_assert(alignof(ElfW(Sym)) <= 16,
+                "alignment of tmp buf too small for Sym");
+
+  SymbolCacheLine symbol_cache_[SYMBOL_CACHE_LINES];
+};
+
+static std::atomic<Symbolizer *> g_cached_symbolizer;
+
+}  // namespace
+
+static int SymbolizerSize() {
+#if defined(__wasm__) || defined(__asmjs__)
+  int pagesize = getpagesize();
+#else
+  int pagesize = sysconf(_SC_PAGESIZE);
+#endif
+  return ((sizeof(Symbolizer) - 1) / pagesize + 1) * pagesize;
+}
+
+// Return (and set null) g_cached_symbolized_state if it is not null.
+// Otherwise return a new symbolizer.
+static Symbolizer *AllocateSymbolizer() {
+  InitSigSafeArena();
+  Symbolizer *symbolizer =
+      g_cached_symbolizer.exchange(nullptr, std::memory_order_acquire);
+  if (symbolizer != nullptr) {
+    return symbolizer;
+  }
+  return new (base_internal::LowLevelAlloc::AllocWithArena(
+      SymbolizerSize(), SigSafeArena())) Symbolizer();
+}
+
+// Set g_cached_symbolize_state to s if it is null, otherwise
+// delete s.
+static void FreeSymbolizer(Symbolizer *s) {
+  Symbolizer *old_cached_symbolizer = nullptr;
+  if (!g_cached_symbolizer.compare_exchange_strong(old_cached_symbolizer, s,
+                                                   std::memory_order_release,
+                                                   std::memory_order_relaxed)) {
+    s->~Symbolizer();
+    base_internal::LowLevelAlloc::Free(s);
+  }
+}
+
+Symbolizer::Symbolizer() : ok_(true), addr_map_read_(false) {
+  for (SymbolCacheLine &symbol_cache_line : symbol_cache_) {
+    for (size_t j = 0; j < ABSL_ARRAYSIZE(symbol_cache_line.name); ++j) {
+      symbol_cache_line.pc[j] = nullptr;
+      symbol_cache_line.name[j] = nullptr;
+      symbol_cache_line.age[j] = 0;
+    }
+  }
+}
+
+Symbolizer::~Symbolizer() {
+  for (SymbolCacheLine &symbol_cache_line : symbol_cache_) {
+    for (char *s : symbol_cache_line.name) {
+      base_internal::LowLevelAlloc::Free(s);
+    }
+  }
+  ClearAddrMap();
+}
+
+// We don't use assert() since it's not guaranteed to be
+// async-signal-safe.  Instead we define a minimal assertion
+// macro. So far, we don't need pretty printing for __FILE__, etc.
+#define SAFE_ASSERT(expr) ((expr) ? static_cast<void>(0) : abort())
+
+// Read up to "count" bytes from file descriptor "fd" into the buffer
+// starting at "buf" while handling short reads and EINTR.  On
+// success, return the number of bytes read.  Otherwise, return -1.
+static ssize_t ReadPersistent(int fd, void *buf, size_t count) {
+  SAFE_ASSERT(fd >= 0);
+  SAFE_ASSERT(count <= SSIZE_MAX);
+  char *buf0 = reinterpret_cast<char *>(buf);
+  size_t num_bytes = 0;
+  while (num_bytes < count) {
+    ssize_t len;
+    NO_INTR(len = read(fd, buf0 + num_bytes, count - num_bytes));
+    if (len < 0) {  // There was an error other than EINTR.
+      ABSL_RAW_LOG(WARNING, "read failed: errno=%d", errno);
+      return -1;
+    }
+    if (len == 0) {  // Reached EOF.
+      break;
+    }
+    num_bytes += len;
+  }
+  SAFE_ASSERT(num_bytes <= count);
+  return static_cast<ssize_t>(num_bytes);
+}
+
+// Read up to "count" bytes from "offset" in the file pointed by file
+// descriptor "fd" into the buffer starting at "buf".  On success,
+// return the number of bytes read.  Otherwise, return -1.
+static ssize_t ReadFromOffset(const int fd, void *buf, const size_t count,
+                              const off_t offset) {
+  off_t off = lseek(fd, offset, SEEK_SET);
+  if (off == (off_t)-1) {
+    ABSL_RAW_LOG(WARNING, "lseek(%d, %ju, SEEK_SET) failed: errno=%d", fd,
+                 static_cast<uintmax_t>(offset), errno);
+    return -1;
+  }
+  return ReadPersistent(fd, buf, count);
+}
+
+// Try reading exactly "count" bytes from "offset" bytes in a file
+// pointed by "fd" into the buffer starting at "buf" while handling
+// short reads and EINTR.  On success, return true. Otherwise, return
+// false.
+static bool ReadFromOffsetExact(const int fd, void *buf, const size_t count,
+                                const off_t offset) {
+  ssize_t len = ReadFromOffset(fd, buf, count, offset);
+  return len >= 0 && static_cast<size_t>(len) == count;
+}
+
+// Returns elf_header.e_type if the file pointed by fd is an ELF binary.
+static int FileGetElfType(const int fd) {
+  ElfW(Ehdr) elf_header;
+  if (!ReadFromOffsetExact(fd, &elf_header, sizeof(elf_header), 0)) {
+    return -1;
+  }
+  if (memcmp(elf_header.e_ident, ELFMAG, SELFMAG) != 0) {
+    return -1;
+  }
+  return elf_header.e_type;
+}
+
+// Read the section headers in the given ELF binary, and if a section
+// of the specified type is found, set the output to this section header
+// and return true.  Otherwise, return false.
+// To keep stack consumption low, we would like this function to not get
+// inlined.
+static ABSL_ATTRIBUTE_NOINLINE bool GetSectionHeaderByType(
+    const int fd, ElfW(Half) sh_num, const off_t sh_offset, ElfW(Word) type,
+    ElfW(Shdr) * out, char *tmp_buf, int tmp_buf_size) {
+  ElfW(Shdr) *buf = reinterpret_cast<ElfW(Shdr) *>(tmp_buf);
+  const int buf_entries = tmp_buf_size / sizeof(buf[0]);
+  const int buf_bytes = buf_entries * sizeof(buf[0]);
+
+  for (int i = 0; i < sh_num;) {
+    const ssize_t num_bytes_left = (sh_num - i) * sizeof(buf[0]);
+    const ssize_t num_bytes_to_read =
+        (buf_bytes > num_bytes_left) ? num_bytes_left : buf_bytes;
+    const off_t offset = sh_offset + i * sizeof(buf[0]);
+    const ssize_t len = ReadFromOffset(fd, buf, num_bytes_to_read, offset);
+    if (len % sizeof(buf[0]) != 0) {
+      ABSL_RAW_LOG(
+          WARNING,
+          "Reading %zd bytes from offset %ju returned %zd which is not a "
+          "multiple of %zu.",
+          num_bytes_to_read, static_cast<uintmax_t>(offset), len,
+          sizeof(buf[0]));
+      return false;
+    }
+    const ssize_t num_headers_in_buf = len / sizeof(buf[0]);
+    SAFE_ASSERT(num_headers_in_buf <= buf_entries);
+    for (int j = 0; j < num_headers_in_buf; ++j) {
+      if (buf[j].sh_type == type) {
+        *out = buf[j];
+        return true;
+      }
+    }
+    i += num_headers_in_buf;
+  }
+  return false;
+}
+
+// There is no particular reason to limit section name to 63 characters,
+// but there has (as yet) been no need for anything longer either.
+const int kMaxSectionNameLen = 64;
+
+bool ForEachSection(int fd,
                     const std::function<bool(y_absl::string_view name,
-                                             const ElfW(Shdr) &)> &callback) { 
-  ElfW(Ehdr) elf_header; 
-  if (!ReadFromOffsetExact(fd, &elf_header, sizeof(elf_header), 0)) { 
-    return false; 
-  } 
- 
-  ElfW(Shdr) shstrtab; 
-  off_t shstrtab_offset = 
-      (elf_header.e_shoff + elf_header.e_shentsize * elf_header.e_shstrndx); 
-  if (!ReadFromOffsetExact(fd, &shstrtab, sizeof(shstrtab), shstrtab_offset)) { 
-    return false; 
-  } 
- 
-  for (int i = 0; i < elf_header.e_shnum; ++i) { 
-    ElfW(Shdr) out; 
-    off_t section_header_offset = 
-        (elf_header.e_shoff + elf_header.e_shentsize * i); 
-    if (!ReadFromOffsetExact(fd, &out, sizeof(out), section_header_offset)) { 
-      return false; 
-    } 
-    off_t name_offset = shstrtab.sh_offset + out.sh_name; 
+                                             const ElfW(Shdr) &)> &callback) {
+  ElfW(Ehdr) elf_header;
+  if (!ReadFromOffsetExact(fd, &elf_header, sizeof(elf_header), 0)) {
+    return false;
+  }
+
+  ElfW(Shdr) shstrtab;
+  off_t shstrtab_offset =
+      (elf_header.e_shoff + elf_header.e_shentsize * elf_header.e_shstrndx);
+  if (!ReadFromOffsetExact(fd, &shstrtab, sizeof(shstrtab), shstrtab_offset)) {
+    return false;
+  }
+
+  for (int i = 0; i < elf_header.e_shnum; ++i) {
+    ElfW(Shdr) out;
+    off_t section_header_offset =
+        (elf_header.e_shoff + elf_header.e_shentsize * i);
+    if (!ReadFromOffsetExact(fd, &out, sizeof(out), section_header_offset)) {
+      return false;
+    }
+    off_t name_offset = shstrtab.sh_offset + out.sh_name;
     char header_name[kMaxSectionNameLen];
-    ssize_t n_read = 
-        ReadFromOffset(fd, &header_name, kMaxSectionNameLen, name_offset); 
-    if (n_read == -1) { 
-      return false; 
-    } else if (n_read > kMaxSectionNameLen) { 
-      // Long read? 
-      return false; 
-    } 
- 
+    ssize_t n_read =
+        ReadFromOffset(fd, &header_name, kMaxSectionNameLen, name_offset);
+    if (n_read == -1) {
+      return false;
+    } else if (n_read > kMaxSectionNameLen) {
+      // Long read?
+      return false;
+    }
+
     y_absl::string_view name(header_name, strnlen(header_name, n_read));
-    if (!callback(name, out)) { 
-      break; 
-    } 
-  } 
-  return true; 
-} 
- 
-// name_len should include terminating '\0'. 
-bool GetSectionHeaderByName(int fd, const char *name, size_t name_len, 
-                            ElfW(Shdr) * out) { 
-  char header_name[kMaxSectionNameLen]; 
-  if (sizeof(header_name) < name_len) { 
-    ABSL_RAW_LOG(WARNING, 
-                 "Section name '%s' is too long (%zu); " 
-                 "section will not be found (even if present).", 
-                 name, name_len); 
-    // No point in even trying. 
-    return false; 
-  } 
- 
-  ElfW(Ehdr) elf_header; 
-  if (!ReadFromOffsetExact(fd, &elf_header, sizeof(elf_header), 0)) { 
-    return false; 
-  } 
- 
-  ElfW(Shdr) shstrtab; 
-  off_t shstrtab_offset = 
-      (elf_header.e_shoff + elf_header.e_shentsize * elf_header.e_shstrndx); 
-  if (!ReadFromOffsetExact(fd, &shstrtab, sizeof(shstrtab), shstrtab_offset)) { 
-    return false; 
-  } 
- 
-  for (int i = 0; i < elf_header.e_shnum; ++i) { 
-    off_t section_header_offset = 
-        (elf_header.e_shoff + elf_header.e_shentsize * i); 
-    if (!ReadFromOffsetExact(fd, out, sizeof(*out), section_header_offset)) { 
-      return false; 
-    } 
-    off_t name_offset = shstrtab.sh_offset + out->sh_name; 
-    ssize_t n_read = ReadFromOffset(fd, &header_name, name_len, name_offset); 
-    if (n_read < 0) { 
-      return false; 
-    } else if (static_cast<size_t>(n_read) != name_len) { 
-      // Short read -- name could be at end of file. 
-      continue; 
-    } 
-    if (memcmp(header_name, name, name_len) == 0) { 
-      return true; 
-    } 
-  } 
-  return false; 
-} 
- 
-// Compare symbols at in the same address. 
-// Return true if we should pick symbol1. 
-static bool ShouldPickFirstSymbol(const ElfW(Sym) & symbol1, 
-                                  const ElfW(Sym) & symbol2) { 
-  // If one of the symbols is weak and the other is not, pick the one 
-  // this is not a weak symbol. 
-  char bind1 = ELF_ST_BIND(symbol1.st_info); 
-  char bind2 = ELF_ST_BIND(symbol1.st_info); 
-  if (bind1 == STB_WEAK && bind2 != STB_WEAK) return false; 
-  if (bind2 == STB_WEAK && bind1 != STB_WEAK) return true; 
- 
-  // If one of the symbols has zero size and the other is not, pick the 
-  // one that has non-zero size. 
-  if (symbol1.st_size != 0 && symbol2.st_size == 0) { 
-    return true; 
-  } 
-  if (symbol1.st_size == 0 && symbol2.st_size != 0) { 
-    return false; 
-  } 
- 
-  // If one of the symbols has no type and the other is not, pick the 
-  // one that has a type. 
-  char type1 = ELF_ST_TYPE(symbol1.st_info); 
-  char type2 = ELF_ST_TYPE(symbol1.st_info); 
-  if (type1 != STT_NOTYPE && type2 == STT_NOTYPE) { 
-    return true; 
-  } 
-  if (type1 == STT_NOTYPE && type2 != STT_NOTYPE) { 
-    return false; 
-  } 
- 
-  // Pick the first one, if we still cannot decide. 
-  return true; 
-} 
- 
-// Return true if an address is inside a section. 
-static bool InSection(const void *address, const ElfW(Shdr) * section) { 
-  const char *start = reinterpret_cast<const char *>(section->sh_addr); 
-  size_t size = static_cast<size_t>(section->sh_size); 
-  return start <= address && address < (start + size); 
-} 
- 
-static const char *ComputeOffset(const char *base, ptrdiff_t offset) { 
-  // Note: cast to uintptr_t to avoid undefined behavior when base evaluates to 
-  // zero and offset is non-zero. 
-  return reinterpret_cast<const char *>( 
-      reinterpret_cast<uintptr_t>(base) + offset); 
-} 
- 
-// Read a symbol table and look for the symbol containing the 
-// pc. Iterate over symbols in a symbol table and look for the symbol 
-// containing "pc".  If the symbol is found, and its name fits in 
-// out_size, the name is written into out and SYMBOL_FOUND is returned. 
-// If the name does not fit, truncated name is written into out, 
-// and SYMBOL_TRUNCATED is returned. Out is NUL-terminated. 
-// If the symbol is not found, SYMBOL_NOT_FOUND is returned; 
-// To keep stack consumption low, we would like this function to not get 
-// inlined. 
-static ABSL_ATTRIBUTE_NOINLINE FindSymbolResult FindSymbol( 
-    const void *const pc, const int fd, char *out, int out_size, 
-    ptrdiff_t relocation, const ElfW(Shdr) * strtab, const ElfW(Shdr) * symtab, 
-    const ElfW(Shdr) * opd, char *tmp_buf, int tmp_buf_size) { 
-  if (symtab == nullptr) { 
-    return SYMBOL_NOT_FOUND; 
-  } 
- 
-  // Read multiple symbols at once to save read() calls. 
-  ElfW(Sym) *buf = reinterpret_cast<ElfW(Sym) *>(tmp_buf); 
-  const int buf_entries = tmp_buf_size / sizeof(buf[0]); 
- 
-  const int num_symbols = symtab->sh_size / symtab->sh_entsize; 
- 
-  // On platforms using an .opd section (PowerPC & IA64), a function symbol 
-  // has the address of a function descriptor, which contains the real 
-  // starting address.  However, we do not always want to use the real 
-  // starting address because we sometimes want to symbolize a function 
-  // pointer into the .opd section, e.g. FindSymbol(&foo,...). 
-  const bool pc_in_opd = 
-      kPlatformUsesOPDSections && opd != nullptr && InSection(pc, opd); 
-  const bool deref_function_descriptor_pointer = 
-      kPlatformUsesOPDSections && opd != nullptr && !pc_in_opd; 
- 
-  ElfW(Sym) best_match; 
-  SafeMemZero(&best_match, sizeof(best_match)); 
-  bool found_match = false; 
-  for (int i = 0; i < num_symbols;) { 
-    off_t offset = symtab->sh_offset + i * symtab->sh_entsize; 
-    const int num_remaining_symbols = num_symbols - i; 
-    const int entries_in_chunk = std::min(num_remaining_symbols, buf_entries); 
-    const int bytes_in_chunk = entries_in_chunk * sizeof(buf[0]); 
-    const ssize_t len = ReadFromOffset(fd, buf, bytes_in_chunk, offset); 
-    SAFE_ASSERT(len % sizeof(buf[0]) == 0); 
-    const ssize_t num_symbols_in_buf = len / sizeof(buf[0]); 
-    SAFE_ASSERT(num_symbols_in_buf <= entries_in_chunk); 
-    for (int j = 0; j < num_symbols_in_buf; ++j) { 
-      const ElfW(Sym) &symbol = buf[j]; 
- 
-      // For a DSO, a symbol address is relocated by the loading address. 
-      // We keep the original address for opd redirection below. 
-      const char *const original_start_address = 
-          reinterpret_cast<const char *>(symbol.st_value); 
-      const char *start_address = 
-          ComputeOffset(original_start_address, relocation); 
- 
+    if (!callback(name, out)) {
+      break;
+    }
+  }
+  return true;
+}
+
+// name_len should include terminating '\0'.
+bool GetSectionHeaderByName(int fd, const char *name, size_t name_len,
+                            ElfW(Shdr) * out) {
+  char header_name[kMaxSectionNameLen];
+  if (sizeof(header_name) < name_len) {
+    ABSL_RAW_LOG(WARNING,
+                 "Section name '%s' is too long (%zu); "
+                 "section will not be found (even if present).",
+                 name, name_len);
+    // No point in even trying.
+    return false;
+  }
+
+  ElfW(Ehdr) elf_header;
+  if (!ReadFromOffsetExact(fd, &elf_header, sizeof(elf_header), 0)) {
+    return false;
+  }
+
+  ElfW(Shdr) shstrtab;
+  off_t shstrtab_offset =
+      (elf_header.e_shoff + elf_header.e_shentsize * elf_header.e_shstrndx);
+  if (!ReadFromOffsetExact(fd, &shstrtab, sizeof(shstrtab), shstrtab_offset)) {
+    return false;
+  }
+
+  for (int i = 0; i < elf_header.e_shnum; ++i) {
+    off_t section_header_offset =
+        (elf_header.e_shoff + elf_header.e_shentsize * i);
+    if (!ReadFromOffsetExact(fd, out, sizeof(*out), section_header_offset)) {
+      return false;
+    }
+    off_t name_offset = shstrtab.sh_offset + out->sh_name;
+    ssize_t n_read = ReadFromOffset(fd, &header_name, name_len, name_offset);
+    if (n_read < 0) {
+      return false;
+    } else if (static_cast<size_t>(n_read) != name_len) {
+      // Short read -- name could be at end of file.
+      continue;
+    }
+    if (memcmp(header_name, name, name_len) == 0) {
+      return true;
+    }
+  }
+  return false;
+}
+
+// Compare symbols at in the same address.
+// Return true if we should pick symbol1.
+static bool ShouldPickFirstSymbol(const ElfW(Sym) & symbol1,
+                                  const ElfW(Sym) & symbol2) {
+  // If one of the symbols is weak and the other is not, pick the one
+  // this is not a weak symbol.
+  char bind1 = ELF_ST_BIND(symbol1.st_info);
+  char bind2 = ELF_ST_BIND(symbol1.st_info);
+  if (bind1 == STB_WEAK && bind2 != STB_WEAK) return false;
+  if (bind2 == STB_WEAK && bind1 != STB_WEAK) return true;
+
+  // If one of the symbols has zero size and the other is not, pick the
+  // one that has non-zero size.
+  if (symbol1.st_size != 0 && symbol2.st_size == 0) {
+    return true;
+  }
+  if (symbol1.st_size == 0 && symbol2.st_size != 0) {
+    return false;
+  }
+
+  // If one of the symbols has no type and the other is not, pick the
+  // one that has a type.
+  char type1 = ELF_ST_TYPE(symbol1.st_info);
+  char type2 = ELF_ST_TYPE(symbol1.st_info);
+  if (type1 != STT_NOTYPE && type2 == STT_NOTYPE) {
+    return true;
+  }
+  if (type1 == STT_NOTYPE && type2 != STT_NOTYPE) {
+    return false;
+  }
+
+  // Pick the first one, if we still cannot decide.
+  return true;
+}
+
+// Return true if an address is inside a section.
+static bool InSection(const void *address, const ElfW(Shdr) * section) {
+  const char *start = reinterpret_cast<const char *>(section->sh_addr);
+  size_t size = static_cast<size_t>(section->sh_size);
+  return start <= address && address < (start + size);
+}
+
+static const char *ComputeOffset(const char *base, ptrdiff_t offset) {
+  // Note: cast to uintptr_t to avoid undefined behavior when base evaluates to
+  // zero and offset is non-zero.
+  return reinterpret_cast<const char *>(
+      reinterpret_cast<uintptr_t>(base) + offset);
+}
+
+// Read a symbol table and look for the symbol containing the
+// pc. Iterate over symbols in a symbol table and look for the symbol
+// containing "pc".  If the symbol is found, and its name fits in
+// out_size, the name is written into out and SYMBOL_FOUND is returned.
+// If the name does not fit, truncated name is written into out,
+// and SYMBOL_TRUNCATED is returned. Out is NUL-terminated.
+// If the symbol is not found, SYMBOL_NOT_FOUND is returned;
+// To keep stack consumption low, we would like this function to not get
+// inlined.
+static ABSL_ATTRIBUTE_NOINLINE FindSymbolResult FindSymbol(
+    const void *const pc, const int fd, char *out, int out_size,
+    ptrdiff_t relocation, const ElfW(Shdr) * strtab, const ElfW(Shdr) * symtab,
+    const ElfW(Shdr) * opd, char *tmp_buf, int tmp_buf_size) {
+  if (symtab == nullptr) {
+    return SYMBOL_NOT_FOUND;
+  }
+
+  // Read multiple symbols at once to save read() calls.
+  ElfW(Sym) *buf = reinterpret_cast<ElfW(Sym) *>(tmp_buf);
+  const int buf_entries = tmp_buf_size / sizeof(buf[0]);
+
+  const int num_symbols = symtab->sh_size / symtab->sh_entsize;
+
+  // On platforms using an .opd section (PowerPC & IA64), a function symbol
+  // has the address of a function descriptor, which contains the real
+  // starting address.  However, we do not always want to use the real
+  // starting address because we sometimes want to symbolize a function
+  // pointer into the .opd section, e.g. FindSymbol(&foo,...).
+  const bool pc_in_opd =
+      kPlatformUsesOPDSections && opd != nullptr && InSection(pc, opd);
+  const bool deref_function_descriptor_pointer =
+      kPlatformUsesOPDSections && opd != nullptr && !pc_in_opd;
+
+  ElfW(Sym) best_match;
+  SafeMemZero(&best_match, sizeof(best_match));
+  bool found_match = false;
+  for (int i = 0; i < num_symbols;) {
+    off_t offset = symtab->sh_offset + i * symtab->sh_entsize;
+    const int num_remaining_symbols = num_symbols - i;
+    const int entries_in_chunk = std::min(num_remaining_symbols, buf_entries);
+    const int bytes_in_chunk = entries_in_chunk * sizeof(buf[0]);
+    const ssize_t len = ReadFromOffset(fd, buf, bytes_in_chunk, offset);
+    SAFE_ASSERT(len % sizeof(buf[0]) == 0);
+    const ssize_t num_symbols_in_buf = len / sizeof(buf[0]);
+    SAFE_ASSERT(num_symbols_in_buf <= entries_in_chunk);
+    for (int j = 0; j < num_symbols_in_buf; ++j) {
+      const ElfW(Sym) &symbol = buf[j];
+
+      // For a DSO, a symbol address is relocated by the loading address.
+      // We keep the original address for opd redirection below.
+      const char *const original_start_address =
+          reinterpret_cast<const char *>(symbol.st_value);
+      const char *start_address =
+          ComputeOffset(original_start_address, relocation);
+
 #ifdef __arm__
       // ARM functions are always aligned to multiples of two bytes; the
       // lowest-order bit in start_address is ignored by the CPU and indicates
@@ -715,583 +715,583 @@ static ABSL_ATTRIBUTE_NOINLINE FindSymbolResult FindSymbol(
           reinterpret_cast<uintptr_t>(start_address) & ~1);
 #endif
 
-      if (deref_function_descriptor_pointer && 
-          InSection(original_start_address, opd)) { 
-        // The opd section is mapped into memory.  Just dereference 
-        // start_address to get the first double word, which points to the 
-        // function entry. 
-        start_address = *reinterpret_cast<const char *const *>(start_address); 
-      } 
- 
-      // If pc is inside the .opd section, it points to a function descriptor. 
-      const size_t size = pc_in_opd ? kFunctionDescriptorSize : symbol.st_size; 
-      const void *const end_address = ComputeOffset(start_address, size); 
-      if (symbol.st_value != 0 &&  // Skip null value symbols. 
-          symbol.st_shndx != 0 &&  // Skip undefined symbols. 
-#ifdef STT_TLS 
-          ELF_ST_TYPE(symbol.st_info) != STT_TLS &&  // Skip thread-local data. 
-#endif                                               // STT_TLS 
-          ((start_address <= pc && pc < end_address) || 
-           (start_address == pc && pc == end_address))) { 
-        if (!found_match || ShouldPickFirstSymbol(symbol, best_match)) { 
-          found_match = true; 
-          best_match = symbol; 
-        } 
-      } 
-    } 
-    i += num_symbols_in_buf; 
-  } 
- 
-  if (found_match) { 
-    const size_t off = strtab->sh_offset + best_match.st_name; 
-    const ssize_t n_read = ReadFromOffset(fd, out, out_size, off); 
-    if (n_read <= 0) { 
-      // This should never happen. 
-      ABSL_RAW_LOG(WARNING, 
-                   "Unable to read from fd %d at offset %zu: n_read = %zd", fd, 
-                   off, n_read); 
-      return SYMBOL_NOT_FOUND; 
-    } 
-    ABSL_RAW_CHECK(n_read <= out_size, "ReadFromOffset read too much data."); 
- 
-    // strtab->sh_offset points into .strtab-like section that contains 
-    // NUL-terminated strings: '\0foo\0barbaz\0...". 
-    // 
-    // sh_offset+st_name points to the start of symbol name, but we don't know 
-    // how long the symbol is, so we try to read as much as we have space for, 
-    // and usually over-read (i.e. there is a NUL somewhere before n_read). 
-    if (memchr(out, '\0', n_read) == nullptr) { 
-      // Either out_size was too small (n_read == out_size and no NUL), or 
-      // we tried to read past the EOF (n_read < out_size) and .strtab is 
-      // corrupt (missing terminating NUL; should never happen for valid ELF). 
-      out[n_read - 1] = '\0'; 
-      return SYMBOL_TRUNCATED; 
-    } 
-    return SYMBOL_FOUND; 
-  } 
- 
-  return SYMBOL_NOT_FOUND; 
-} 
- 
-// Get the symbol name of "pc" from the file pointed by "fd".  Process 
-// both regular and dynamic symbol tables if necessary. 
-// See FindSymbol() comment for description of return value. 
-FindSymbolResult Symbolizer::GetSymbolFromObjectFile( 
-    const ObjFile &obj, const void *const pc, const ptrdiff_t relocation, 
-    char *out, int out_size, char *tmp_buf, int tmp_buf_size) { 
-  ElfW(Shdr) symtab; 
-  ElfW(Shdr) strtab; 
-  ElfW(Shdr) opd; 
-  ElfW(Shdr) *opd_ptr = nullptr; 
- 
-  // On platforms using an .opd sections for function descriptor, read 
-  // the section header.  The .opd section is in data segment and should be 
-  // loaded but we check that it is mapped just to be extra careful. 
-  if (kPlatformUsesOPDSections) { 
-    if (GetSectionHeaderByName(obj.fd, kOpdSectionName, 
-                               sizeof(kOpdSectionName) - 1, &opd) && 
-        FindObjFile(reinterpret_cast<const char *>(opd.sh_addr) + relocation, 
-                    opd.sh_size) != nullptr) { 
-      opd_ptr = &opd; 
-    } else { 
-      return SYMBOL_NOT_FOUND; 
-    } 
-  } 
- 
-  // Consult a regular symbol table, then fall back to the dynamic symbol table. 
-  for (const auto symbol_table_type : {SHT_SYMTAB, SHT_DYNSYM}) { 
-    if (!GetSectionHeaderByType(obj.fd, obj.elf_header.e_shnum, 
-                                obj.elf_header.e_shoff, symbol_table_type, 
-                                &symtab, tmp_buf, tmp_buf_size)) { 
-      continue; 
-    } 
-    if (!ReadFromOffsetExact( 
-            obj.fd, &strtab, sizeof(strtab), 
-            obj.elf_header.e_shoff + symtab.sh_link * sizeof(symtab))) { 
-      continue; 
-    } 
-    const FindSymbolResult rc = 
-        FindSymbol(pc, obj.fd, out, out_size, relocation, &strtab, &symtab, 
-                   opd_ptr, tmp_buf, tmp_buf_size); 
-    if (rc != SYMBOL_NOT_FOUND) { 
-      return rc; 
-    } 
-  } 
- 
-  return SYMBOL_NOT_FOUND; 
-} 
- 
-namespace { 
-// Thin wrapper around a file descriptor so that the file descriptor 
-// gets closed for sure. 
-class FileDescriptor { 
- public: 
-  explicit FileDescriptor(int fd) : fd_(fd) {} 
-  FileDescriptor(const FileDescriptor &) = delete; 
-  FileDescriptor &operator=(const FileDescriptor &) = delete; 
- 
-  ~FileDescriptor() { 
-    if (fd_ >= 0) { 
-      NO_INTR(close(fd_)); 
-    } 
-  } 
- 
-  int get() const { return fd_; } 
- 
- private: 
-  const int fd_; 
-}; 
- 
-// Helper class for reading lines from file. 
-// 
-// Note: we don't use ProcMapsIterator since the object is big (it has 
-// a 5k array member) and uses async-unsafe functions such as sscanf() 
-// and snprintf(). 
-class LineReader { 
- public: 
-  explicit LineReader(int fd, char *buf, int buf_len) 
-      : fd_(fd), 
-        buf_len_(buf_len), 
-        buf_(buf), 
-        bol_(buf), 
-        eol_(buf), 
-        eod_(buf) {} 
- 
-  LineReader(const LineReader &) = delete; 
-  LineReader &operator=(const LineReader &) = delete; 
- 
-  // Read '\n'-terminated line from file.  On success, modify "bol" 
-  // and "eol", then return true.  Otherwise, return false. 
-  // 
-  // Note: if the last line doesn't end with '\n', the line will be 
-  // dropped.  It's an intentional behavior to make the code simple. 
-  bool ReadLine(const char **bol, const char **eol) { 
-    if (BufferIsEmpty()) {  // First time. 
-      const ssize_t num_bytes = ReadPersistent(fd_, buf_, buf_len_); 
-      if (num_bytes <= 0) {  // EOF or error. 
-        return false; 
-      } 
-      eod_ = buf_ + num_bytes; 
-      bol_ = buf_; 
-    } else { 
-      bol_ = eol_ + 1;            // Advance to the next line in the buffer. 
-      SAFE_ASSERT(bol_ <= eod_);  // "bol_" can point to "eod_". 
-      if (!HasCompleteLine()) { 
-        const int incomplete_line_length = eod_ - bol_; 
-        // Move the trailing incomplete line to the beginning. 
-        memmove(buf_, bol_, incomplete_line_length); 
-        // Read text from file and append it. 
-        char *const append_pos = buf_ + incomplete_line_length; 
-        const int capacity_left = buf_len_ - incomplete_line_length; 
-        const ssize_t num_bytes = 
-            ReadPersistent(fd_, append_pos, capacity_left); 
-        if (num_bytes <= 0) {  // EOF or error. 
-          return false; 
-        } 
-        eod_ = append_pos + num_bytes; 
-        bol_ = buf_; 
-      } 
-    } 
-    eol_ = FindLineFeed(); 
-    if (eol_ == nullptr) {  // '\n' not found.  Malformed line. 
-      return false; 
-    } 
-    *eol_ = '\0';  // Replace '\n' with '\0'. 
- 
-    *bol = bol_; 
-    *eol = eol_; 
-    return true; 
-  } 
- 
- private: 
-  char *FindLineFeed() const { 
-    return reinterpret_cast<char *>(memchr(bol_, '\n', eod_ - bol_)); 
-  } 
- 
-  bool BufferIsEmpty() const { return buf_ == eod_; } 
- 
-  bool HasCompleteLine() const { 
-    return !BufferIsEmpty() && FindLineFeed() != nullptr; 
-  } 
- 
-  const int fd_; 
-  const int buf_len_; 
-  char *const buf_; 
-  char *bol_; 
-  char *eol_; 
-  const char *eod_;  // End of data in "buf_". 
-}; 
-}  // namespace 
- 
-// Place the hex number read from "start" into "*hex".  The pointer to 
-// the first non-hex character or "end" is returned. 
-static const char *GetHex(const char *start, const char *end, 
-                          uint64_t *const value) { 
-  uint64_t hex = 0; 
-  const char *p; 
-  for (p = start; p < end; ++p) { 
-    int ch = *p; 
-    if ((ch >= '0' && ch <= '9') || (ch >= 'A' && ch <= 'F') || 
-        (ch >= 'a' && ch <= 'f')) { 
-      hex = (hex << 4) | (ch < 'A' ? ch - '0' : (ch & 0xF) + 9); 
-    } else {  // Encountered the first non-hex character. 
-      break; 
-    } 
-  } 
-  SAFE_ASSERT(p <= end); 
-  *value = hex; 
-  return p; 
-} 
- 
-static const char *GetHex(const char *start, const char *end, 
-                          const void **const addr) { 
-  uint64_t hex = 0; 
-  const char *p = GetHex(start, end, &hex); 
-  *addr = reinterpret_cast<void *>(hex); 
-  return p; 
-} 
- 
-// Normally we are only interested in "r?x" maps. 
-// On the PowerPC, function pointers point to descriptors in the .opd 
-// section.  The descriptors themselves are not executable code, so 
-// we need to relax the check below to "r??". 
-static bool ShouldUseMapping(const char *const flags) { 
-  return flags[0] == 'r' && (kPlatformUsesOPDSections || flags[2] == 'x'); 
-} 
- 
-// Read /proc/self/maps and run "callback" for each mmapped file found.  If 
-// "callback" returns false, stop scanning and return true. Else continue 
-// scanning /proc/self/maps. Return true if no parse error is found. 
-static ABSL_ATTRIBUTE_NOINLINE bool ReadAddrMap( 
-    bool (*callback)(const char *filename, const void *const start_addr, 
-                     const void *const end_addr, uint64_t offset, void *arg), 
-    void *arg, void *tmp_buf, int tmp_buf_size) { 
-  // Use /proc/self/task/<pid>/maps instead of /proc/self/maps. The latter 
-  // requires kernel to stop all threads, and is significantly slower when there 
-  // are 1000s of threads. 
-  char maps_path[80]; 
-  snprintf(maps_path, sizeof(maps_path), "/proc/self/task/%d/maps", getpid()); 
- 
-  int maps_fd; 
-  NO_INTR(maps_fd = open(maps_path, O_RDONLY)); 
-  FileDescriptor wrapped_maps_fd(maps_fd); 
-  if (wrapped_maps_fd.get() < 0) { 
-    ABSL_RAW_LOG(WARNING, "%s: errno=%d", maps_path, errno); 
-    return false; 
-  } 
- 
-  // Iterate over maps and look for the map containing the pc.  Then 
-  // look into the symbol tables inside. 
-  LineReader reader(wrapped_maps_fd.get(), static_cast<char *>(tmp_buf), 
-                    tmp_buf_size); 
-  while (true) { 
-    const char *cursor; 
-    const char *eol; 
-    if (!reader.ReadLine(&cursor, &eol)) {  // EOF or malformed line. 
-      break; 
-    } 
- 
-    const char *line = cursor; 
-    const void *start_address; 
-    // Start parsing line in /proc/self/maps.  Here is an example: 
-    // 
-    // 08048000-0804c000 r-xp 00000000 08:01 2142121    /bin/cat 
-    // 
-    // We want start address (08048000), end address (0804c000), flags 
-    // (r-xp) and file name (/bin/cat). 
- 
-    // Read start address. 
-    cursor = GetHex(cursor, eol, &start_address); 
-    if (cursor == eol || *cursor != '-') { 
-      ABSL_RAW_LOG(WARNING, "Corrupt /proc/self/maps line: %s", line); 
-      return false; 
-    } 
-    ++cursor;  // Skip '-'. 
- 
-    // Read end address. 
-    const void *end_address; 
-    cursor = GetHex(cursor, eol, &end_address); 
-    if (cursor == eol || *cursor != ' ') { 
-      ABSL_RAW_LOG(WARNING, "Corrupt /proc/self/maps line: %s", line); 
-      return false; 
-    } 
-    ++cursor;  // Skip ' '. 
- 
-    // Read flags.  Skip flags until we encounter a space or eol. 
-    const char *const flags_start = cursor; 
-    while (cursor < eol && *cursor != ' ') { 
-      ++cursor; 
-    } 
-    // We expect at least four letters for flags (ex. "r-xp"). 
-    if (cursor == eol || cursor < flags_start + 4) { 
-      ABSL_RAW_LOG(WARNING, "Corrupt /proc/self/maps: %s", line); 
-      return false; 
-    } 
- 
-    // Check flags. 
-    if (!ShouldUseMapping(flags_start)) { 
-      continue;  // We skip this map. 
-    } 
-    ++cursor;  // Skip ' '. 
- 
-    // Read file offset. 
-    uint64_t offset; 
-    cursor = GetHex(cursor, eol, &offset); 
-    ++cursor;  // Skip ' '. 
- 
-    // Skip to file name.  "cursor" now points to dev.  We need to skip at least 
-    // two spaces for dev and inode. 
-    int num_spaces = 0; 
-    while (cursor < eol) { 
-      if (*cursor == ' ') { 
-        ++num_spaces; 
-      } else if (num_spaces >= 2) { 
-        // The first non-space character after  skipping two spaces 
-        // is the beginning of the file name. 
-        break; 
-      } 
-      ++cursor; 
-    } 
- 
-    // Check whether this entry corresponds to our hint table for the true 
-    // filename. 
-    bool hinted = 
-        GetFileMappingHint(&start_address, &end_address, &offset, &cursor); 
-    if (!hinted && (cursor == eol || cursor[0] == '[')) { 
-      // not an object file, typically [vdso] or [vsyscall] 
-      continue; 
-    } 
-    if (!callback(cursor, start_address, end_address, offset, arg)) break; 
-  } 
-  return true; 
-} 
- 
-// Find the objfile mapped in address region containing [addr, addr + len). 
-ObjFile *Symbolizer::FindObjFile(const void *const addr, size_t len) { 
-  for (int i = 0; i < 2; ++i) { 
-    if (!ok_) return nullptr; 
- 
-    // Read /proc/self/maps if necessary 
-    if (!addr_map_read_) { 
-      addr_map_read_ = true; 
-      if (!ReadAddrMap(RegisterObjFile, this, tmp_buf_, TMP_BUF_SIZE)) { 
-        ok_ = false; 
-        return nullptr; 
-      } 
-    } 
- 
-    int lo = 0; 
-    int hi = addr_map_.Size(); 
-    while (lo < hi) { 
-      int mid = (lo + hi) / 2; 
-      if (addr < addr_map_.At(mid)->end_addr) { 
-        hi = mid; 
-      } else { 
-        lo = mid + 1; 
-      } 
-    } 
-    if (lo != addr_map_.Size()) { 
-      ObjFile *obj = addr_map_.At(lo); 
-      SAFE_ASSERT(obj->end_addr > addr); 
-      if (addr >= obj->start_addr && 
-          reinterpret_cast<const char *>(addr) + len <= obj->end_addr) 
-        return obj; 
-    } 
- 
-    // The address mapping may have changed since it was last read.  Retry. 
-    ClearAddrMap(); 
-  } 
-  return nullptr; 
-} 
- 
-void Symbolizer::ClearAddrMap() { 
-  for (int i = 0; i != addr_map_.Size(); i++) { 
-    ObjFile *o = addr_map_.At(i); 
-    base_internal::LowLevelAlloc::Free(o->filename); 
-    if (o->fd >= 0) { 
-      NO_INTR(close(o->fd)); 
-    } 
-  } 
-  addr_map_.Clear(); 
-  addr_map_read_ = false; 
-} 
- 
-// Callback for ReadAddrMap to register objfiles in an in-memory table. 
-bool Symbolizer::RegisterObjFile(const char *filename, 
-                                 const void *const start_addr, 
-                                 const void *const end_addr, uint64_t offset, 
-                                 void *arg) { 
-  Symbolizer *impl = static_cast<Symbolizer *>(arg); 
- 
-  // Files are supposed to be added in the increasing address order.  Make 
-  // sure that's the case. 
-  int addr_map_size = impl->addr_map_.Size(); 
-  if (addr_map_size != 0) { 
-    ObjFile *old = impl->addr_map_.At(addr_map_size - 1); 
-    if (old->end_addr > end_addr) { 
-      ABSL_RAW_LOG(ERROR, 
-                   "Unsorted addr map entry: 0x%" PRIxPTR ": %s <-> 0x%" PRIxPTR 
-                   ": %s", 
-                   reinterpret_cast<uintptr_t>(end_addr), filename, 
-                   reinterpret_cast<uintptr_t>(old->end_addr), old->filename); 
-      return true; 
-    } else if (old->end_addr == end_addr) { 
-      // The same entry appears twice. This sometimes happens for [vdso]. 
-      if (old->start_addr != start_addr || 
-          strcmp(old->filename, filename) != 0) { 
-        ABSL_RAW_LOG(ERROR, 
-                     "Duplicate addr 0x%" PRIxPTR ": %s <-> 0x%" PRIxPTR ": %s", 
-                     reinterpret_cast<uintptr_t>(end_addr), filename, 
-                     reinterpret_cast<uintptr_t>(old->end_addr), old->filename); 
-      } 
-      return true; 
-    } 
-  } 
-  ObjFile *obj = impl->addr_map_.Add(); 
-  obj->filename = impl->CopyString(filename); 
-  obj->start_addr = start_addr; 
-  obj->end_addr = end_addr; 
-  obj->offset = offset; 
-  obj->elf_type = -1;  // filled on demand 
-  obj->fd = -1;        // opened on demand 
-  return true; 
-} 
- 
-// This function wraps the Demangle function to provide an interface 
-// where the input symbol is demangled in-place. 
-// To keep stack consumption low, we would like this function to not 
-// get inlined. 
-static ABSL_ATTRIBUTE_NOINLINE void DemangleInplace(char *out, int out_size, 
-                                                    char *tmp_buf, 
-                                                    int tmp_buf_size) { 
-  if (Demangle(out, tmp_buf, tmp_buf_size)) { 
-    // Demangling succeeded. Copy to out if the space allows. 
-    int len = strlen(tmp_buf); 
-    if (len + 1 <= out_size) {  // +1 for '\0'. 
-      SAFE_ASSERT(len < tmp_buf_size); 
-      memmove(out, tmp_buf, len + 1); 
-    } 
-  } 
-} 
- 
-SymbolCacheLine *Symbolizer::GetCacheLine(const void *const pc) { 
-  uintptr_t pc0 = reinterpret_cast<uintptr_t>(pc); 
-  pc0 >>= 3;  // drop the low 3 bits 
- 
-  // Shuffle bits. 
-  pc0 ^= (pc0 >> 6) ^ (pc0 >> 12) ^ (pc0 >> 18); 
-  return &symbol_cache_[pc0 % SYMBOL_CACHE_LINES]; 
-} 
- 
-void Symbolizer::AgeSymbols(SymbolCacheLine *line) { 
-  for (uint32_t &age : line->age) { 
-    ++age; 
-  } 
-} 
- 
-const char *Symbolizer::FindSymbolInCache(const void *const pc) { 
-  if (pc == nullptr) return nullptr; 
- 
-  SymbolCacheLine *line = GetCacheLine(pc); 
-  for (size_t i = 0; i < ABSL_ARRAYSIZE(line->pc); ++i) { 
-    if (line->pc[i] == pc) { 
-      AgeSymbols(line); 
-      line->age[i] = 0; 
-      return line->name[i]; 
-    } 
-  } 
-  return nullptr; 
-} 
- 
-const char *Symbolizer::InsertSymbolInCache(const void *const pc, 
-                                            const char *name) { 
-  SAFE_ASSERT(pc != nullptr); 
- 
-  SymbolCacheLine *line = GetCacheLine(pc); 
-  uint32_t max_age = 0; 
-  int oldest_index = -1; 
-  for (size_t i = 0; i < ABSL_ARRAYSIZE(line->pc); ++i) { 
-    if (line->pc[i] == nullptr) { 
-      AgeSymbols(line); 
-      line->pc[i] = pc; 
-      line->name[i] = CopyString(name); 
-      line->age[i] = 0; 
-      return line->name[i]; 
-    } 
-    if (line->age[i] >= max_age) { 
-      max_age = line->age[i]; 
-      oldest_index = i; 
-    } 
-  } 
- 
-  AgeSymbols(line); 
-  ABSL_RAW_CHECK(oldest_index >= 0, "Corrupt cache"); 
-  base_internal::LowLevelAlloc::Free(line->name[oldest_index]); 
-  line->pc[oldest_index] = pc; 
-  line->name[oldest_index] = CopyString(name); 
-  line->age[oldest_index] = 0; 
-  return line->name[oldest_index]; 
-} 
- 
-static void MaybeOpenFdFromSelfExe(ObjFile *obj) { 
-  if (memcmp(obj->start_addr, ELFMAG, SELFMAG) != 0) { 
-    return; 
-  } 
-  int fd = open("/proc/self/exe", O_RDONLY); 
-  if (fd == -1) { 
-    return; 
-  } 
-  // Verify that contents of /proc/self/exe matches in-memory image of 
-  // the binary. This can fail if the "deleted" binary is in fact not 
-  // the main executable, or for binaries that have the first PT_LOAD 
-  // segment smaller than 4K. We do it in four steps so that the 
-  // buffer is smaller and we don't consume too much stack space. 
-  const char *mem = reinterpret_cast<const char *>(obj->start_addr); 
-  for (int i = 0; i < 4; ++i) { 
-    char buf[1024]; 
-    ssize_t n = read(fd, buf, sizeof(buf)); 
-    if (n != sizeof(buf) || memcmp(buf, mem, sizeof(buf)) != 0) { 
-      close(fd); 
-      return; 
-    } 
-    mem += sizeof(buf); 
-  } 
-  obj->fd = fd; 
-} 
- 
-static bool MaybeInitializeObjFile(ObjFile *obj) { 
-  if (obj->fd < 0) { 
-    obj->fd = open(obj->filename, O_RDONLY); 
- 
-    if (obj->fd < 0) { 
-      // Getting /proc/self/exe here means that we were hinted. 
-      if (strcmp(obj->filename, "/proc/self/exe") == 0) { 
-        // /proc/self/exe may be inaccessible (due to setuid, etc.), so try 
-        // accessing the binary via argv0. 
-        if (argv0_value != nullptr) { 
-          obj->fd = open(argv0_value, O_RDONLY); 
-        } 
-      } else { 
-        MaybeOpenFdFromSelfExe(obj); 
-      } 
-    } 
- 
-    if (obj->fd < 0) { 
-      ABSL_RAW_LOG(WARNING, "%s: open failed: errno=%d", obj->filename, errno); 
-      return false; 
-    } 
-    obj->elf_type = FileGetElfType(obj->fd); 
-    if (obj->elf_type < 0) { 
-      ABSL_RAW_LOG(WARNING, "%s: wrong elf type: %d", obj->filename, 
-                   obj->elf_type); 
-      return false; 
-    } 
- 
-    if (!ReadFromOffsetExact(obj->fd, &obj->elf_header, sizeof(obj->elf_header), 
-                             0)) { 
-      ABSL_RAW_LOG(WARNING, "%s: failed to read elf header", obj->filename); 
-      return false; 
-    } 
+      if (deref_function_descriptor_pointer &&
+          InSection(original_start_address, opd)) {
+        // The opd section is mapped into memory.  Just dereference
+        // start_address to get the first double word, which points to the
+        // function entry.
+        start_address = *reinterpret_cast<const char *const *>(start_address);
+      }
+
+      // If pc is inside the .opd section, it points to a function descriptor.
+      const size_t size = pc_in_opd ? kFunctionDescriptorSize : symbol.st_size;
+      const void *const end_address = ComputeOffset(start_address, size);
+      if (symbol.st_value != 0 &&  // Skip null value symbols.
+          symbol.st_shndx != 0 &&  // Skip undefined symbols.
+#ifdef STT_TLS
+          ELF_ST_TYPE(symbol.st_info) != STT_TLS &&  // Skip thread-local data.
+#endif                                               // STT_TLS
+          ((start_address <= pc && pc < end_address) ||
+           (start_address == pc && pc == end_address))) {
+        if (!found_match || ShouldPickFirstSymbol(symbol, best_match)) {
+          found_match = true;
+          best_match = symbol;
+        }
+      }
+    }
+    i += num_symbols_in_buf;
+  }
+
+  if (found_match) {
+    const size_t off = strtab->sh_offset + best_match.st_name;
+    const ssize_t n_read = ReadFromOffset(fd, out, out_size, off);
+    if (n_read <= 0) {
+      // This should never happen.
+      ABSL_RAW_LOG(WARNING,
+                   "Unable to read from fd %d at offset %zu: n_read = %zd", fd,
+                   off, n_read);
+      return SYMBOL_NOT_FOUND;
+    }
+    ABSL_RAW_CHECK(n_read <= out_size, "ReadFromOffset read too much data.");
+
+    // strtab->sh_offset points into .strtab-like section that contains
+    // NUL-terminated strings: '\0foo\0barbaz\0...".
+    //
+    // sh_offset+st_name points to the start of symbol name, but we don't know
+    // how long the symbol is, so we try to read as much as we have space for,
+    // and usually over-read (i.e. there is a NUL somewhere before n_read).
+    if (memchr(out, '\0', n_read) == nullptr) {
+      // Either out_size was too small (n_read == out_size and no NUL), or
+      // we tried to read past the EOF (n_read < out_size) and .strtab is
+      // corrupt (missing terminating NUL; should never happen for valid ELF).
+      out[n_read - 1] = '\0';
+      return SYMBOL_TRUNCATED;
+    }
+    return SYMBOL_FOUND;
+  }
+
+  return SYMBOL_NOT_FOUND;
+}
+
+// Get the symbol name of "pc" from the file pointed by "fd".  Process
+// both regular and dynamic symbol tables if necessary.
+// See FindSymbol() comment for description of return value.
+FindSymbolResult Symbolizer::GetSymbolFromObjectFile(
+    const ObjFile &obj, const void *const pc, const ptrdiff_t relocation,
+    char *out, int out_size, char *tmp_buf, int tmp_buf_size) {
+  ElfW(Shdr) symtab;
+  ElfW(Shdr) strtab;
+  ElfW(Shdr) opd;
+  ElfW(Shdr) *opd_ptr = nullptr;
+
+  // On platforms using an .opd sections for function descriptor, read
+  // the section header.  The .opd section is in data segment and should be
+  // loaded but we check that it is mapped just to be extra careful.
+  if (kPlatformUsesOPDSections) {
+    if (GetSectionHeaderByName(obj.fd, kOpdSectionName,
+                               sizeof(kOpdSectionName) - 1, &opd) &&
+        FindObjFile(reinterpret_cast<const char *>(opd.sh_addr) + relocation,
+                    opd.sh_size) != nullptr) {
+      opd_ptr = &opd;
+    } else {
+      return SYMBOL_NOT_FOUND;
+    }
+  }
+
+  // Consult a regular symbol table, then fall back to the dynamic symbol table.
+  for (const auto symbol_table_type : {SHT_SYMTAB, SHT_DYNSYM}) {
+    if (!GetSectionHeaderByType(obj.fd, obj.elf_header.e_shnum,
+                                obj.elf_header.e_shoff, symbol_table_type,
+                                &symtab, tmp_buf, tmp_buf_size)) {
+      continue;
+    }
+    if (!ReadFromOffsetExact(
+            obj.fd, &strtab, sizeof(strtab),
+            obj.elf_header.e_shoff + symtab.sh_link * sizeof(symtab))) {
+      continue;
+    }
+    const FindSymbolResult rc =
+        FindSymbol(pc, obj.fd, out, out_size, relocation, &strtab, &symtab,
+                   opd_ptr, tmp_buf, tmp_buf_size);
+    if (rc != SYMBOL_NOT_FOUND) {
+      return rc;
+    }
+  }
+
+  return SYMBOL_NOT_FOUND;
+}
+
+namespace {
+// Thin wrapper around a file descriptor so that the file descriptor
+// gets closed for sure.
+class FileDescriptor {
+ public:
+  explicit FileDescriptor(int fd) : fd_(fd) {}
+  FileDescriptor(const FileDescriptor &) = delete;
+  FileDescriptor &operator=(const FileDescriptor &) = delete;
+
+  ~FileDescriptor() {
+    if (fd_ >= 0) {
+      NO_INTR(close(fd_));
+    }
+  }
+
+  int get() const { return fd_; }
+
+ private:
+  const int fd_;
+};
+
+// Helper class for reading lines from file.
+//
+// Note: we don't use ProcMapsIterator since the object is big (it has
+// a 5k array member) and uses async-unsafe functions such as sscanf()
+// and snprintf().
+class LineReader {
+ public:
+  explicit LineReader(int fd, char *buf, int buf_len)
+      : fd_(fd),
+        buf_len_(buf_len),
+        buf_(buf),
+        bol_(buf),
+        eol_(buf),
+        eod_(buf) {}
+
+  LineReader(const LineReader &) = delete;
+  LineReader &operator=(const LineReader &) = delete;
+
+  // Read '\n'-terminated line from file.  On success, modify "bol"
+  // and "eol", then return true.  Otherwise, return false.
+  //
+  // Note: if the last line doesn't end with '\n', the line will be
+  // dropped.  It's an intentional behavior to make the code simple.
+  bool ReadLine(const char **bol, const char **eol) {
+    if (BufferIsEmpty()) {  // First time.
+      const ssize_t num_bytes = ReadPersistent(fd_, buf_, buf_len_);
+      if (num_bytes <= 0) {  // EOF or error.
+        return false;
+      }
+      eod_ = buf_ + num_bytes;
+      bol_ = buf_;
+    } else {
+      bol_ = eol_ + 1;            // Advance to the next line in the buffer.
+      SAFE_ASSERT(bol_ <= eod_);  // "bol_" can point to "eod_".
+      if (!HasCompleteLine()) {
+        const int incomplete_line_length = eod_ - bol_;
+        // Move the trailing incomplete line to the beginning.
+        memmove(buf_, bol_, incomplete_line_length);
+        // Read text from file and append it.
+        char *const append_pos = buf_ + incomplete_line_length;
+        const int capacity_left = buf_len_ - incomplete_line_length;
+        const ssize_t num_bytes =
+            ReadPersistent(fd_, append_pos, capacity_left);
+        if (num_bytes <= 0) {  // EOF or error.
+          return false;
+        }
+        eod_ = append_pos + num_bytes;
+        bol_ = buf_;
+      }
+    }
+    eol_ = FindLineFeed();
+    if (eol_ == nullptr) {  // '\n' not found.  Malformed line.
+      return false;
+    }
+    *eol_ = '\0';  // Replace '\n' with '\0'.
+
+    *bol = bol_;
+    *eol = eol_;
+    return true;
+  }
+
+ private:
+  char *FindLineFeed() const {
+    return reinterpret_cast<char *>(memchr(bol_, '\n', eod_ - bol_));
+  }
+
+  bool BufferIsEmpty() const { return buf_ == eod_; }
+
+  bool HasCompleteLine() const {
+    return !BufferIsEmpty() && FindLineFeed() != nullptr;
+  }
+
+  const int fd_;
+  const int buf_len_;
+  char *const buf_;
+  char *bol_;
+  char *eol_;
+  const char *eod_;  // End of data in "buf_".
+};
+}  // namespace
+
+// Place the hex number read from "start" into "*hex".  The pointer to
+// the first non-hex character or "end" is returned.
+static const char *GetHex(const char *start, const char *end,
+                          uint64_t *const value) {
+  uint64_t hex = 0;
+  const char *p;
+  for (p = start; p < end; ++p) {
+    int ch = *p;
+    if ((ch >= '0' && ch <= '9') || (ch >= 'A' && ch <= 'F') ||
+        (ch >= 'a' && ch <= 'f')) {
+      hex = (hex << 4) | (ch < 'A' ? ch - '0' : (ch & 0xF) + 9);
+    } else {  // Encountered the first non-hex character.
+      break;
+    }
+  }
+  SAFE_ASSERT(p <= end);
+  *value = hex;
+  return p;
+}
+
+static const char *GetHex(const char *start, const char *end,
+                          const void **const addr) {
+  uint64_t hex = 0;
+  const char *p = GetHex(start, end, &hex);
+  *addr = reinterpret_cast<void *>(hex);
+  return p;
+}
+
+// Normally we are only interested in "r?x" maps.
+// On the PowerPC, function pointers point to descriptors in the .opd
+// section.  The descriptors themselves are not executable code, so
+// we need to relax the check below to "r??".
+static bool ShouldUseMapping(const char *const flags) {
+  return flags[0] == 'r' && (kPlatformUsesOPDSections || flags[2] == 'x');
+}
+
+// Read /proc/self/maps and run "callback" for each mmapped file found.  If
+// "callback" returns false, stop scanning and return true. Else continue
+// scanning /proc/self/maps. Return true if no parse error is found.
+static ABSL_ATTRIBUTE_NOINLINE bool ReadAddrMap(
+    bool (*callback)(const char *filename, const void *const start_addr,
+                     const void *const end_addr, uint64_t offset, void *arg),
+    void *arg, void *tmp_buf, int tmp_buf_size) {
+  // Use /proc/self/task/<pid>/maps instead of /proc/self/maps. The latter
+  // requires kernel to stop all threads, and is significantly slower when there
+  // are 1000s of threads.
+  char maps_path[80];
+  snprintf(maps_path, sizeof(maps_path), "/proc/self/task/%d/maps", getpid());
+
+  int maps_fd;
+  NO_INTR(maps_fd = open(maps_path, O_RDONLY));
+  FileDescriptor wrapped_maps_fd(maps_fd);
+  if (wrapped_maps_fd.get() < 0) {
+    ABSL_RAW_LOG(WARNING, "%s: errno=%d", maps_path, errno);
+    return false;
+  }
+
+  // Iterate over maps and look for the map containing the pc.  Then
+  // look into the symbol tables inside.
+  LineReader reader(wrapped_maps_fd.get(), static_cast<char *>(tmp_buf),
+                    tmp_buf_size);
+  while (true) {
+    const char *cursor;
+    const char *eol;
+    if (!reader.ReadLine(&cursor, &eol)) {  // EOF or malformed line.
+      break;
+    }
+
+    const char *line = cursor;
+    const void *start_address;
+    // Start parsing line in /proc/self/maps.  Here is an example:
+    //
+    // 08048000-0804c000 r-xp 00000000 08:01 2142121    /bin/cat
+    //
+    // We want start address (08048000), end address (0804c000), flags
+    // (r-xp) and file name (/bin/cat).
+
+    // Read start address.
+    cursor = GetHex(cursor, eol, &start_address);
+    if (cursor == eol || *cursor != '-') {
+      ABSL_RAW_LOG(WARNING, "Corrupt /proc/self/maps line: %s", line);
+      return false;
+    }
+    ++cursor;  // Skip '-'.
+
+    // Read end address.
+    const void *end_address;
+    cursor = GetHex(cursor, eol, &end_address);
+    if (cursor == eol || *cursor != ' ') {
+      ABSL_RAW_LOG(WARNING, "Corrupt /proc/self/maps line: %s", line);
+      return false;
+    }
+    ++cursor;  // Skip ' '.
+
+    // Read flags.  Skip flags until we encounter a space or eol.
+    const char *const flags_start = cursor;
+    while (cursor < eol && *cursor != ' ') {
+      ++cursor;
+    }
+    // We expect at least four letters for flags (ex. "r-xp").
+    if (cursor == eol || cursor < flags_start + 4) {
+      ABSL_RAW_LOG(WARNING, "Corrupt /proc/self/maps: %s", line);
+      return false;
+    }
+
+    // Check flags.
+    if (!ShouldUseMapping(flags_start)) {
+      continue;  // We skip this map.
+    }
+    ++cursor;  // Skip ' '.
+
+    // Read file offset.
+    uint64_t offset;
+    cursor = GetHex(cursor, eol, &offset);
+    ++cursor;  // Skip ' '.
+
+    // Skip to file name.  "cursor" now points to dev.  We need to skip at least
+    // two spaces for dev and inode.
+    int num_spaces = 0;
+    while (cursor < eol) {
+      if (*cursor == ' ') {
+        ++num_spaces;
+      } else if (num_spaces >= 2) {
+        // The first non-space character after  skipping two spaces
+        // is the beginning of the file name.
+        break;
+      }
+      ++cursor;
+    }
+
+    // Check whether this entry corresponds to our hint table for the true
+    // filename.
+    bool hinted =
+        GetFileMappingHint(&start_address, &end_address, &offset, &cursor);
+    if (!hinted && (cursor == eol || cursor[0] == '[')) {
+      // not an object file, typically [vdso] or [vsyscall]
+      continue;
+    }
+    if (!callback(cursor, start_address, end_address, offset, arg)) break;
+  }
+  return true;
+}
+
+// Find the objfile mapped in address region containing [addr, addr + len).
+ObjFile *Symbolizer::FindObjFile(const void *const addr, size_t len) {
+  for (int i = 0; i < 2; ++i) {
+    if (!ok_) return nullptr;
+
+    // Read /proc/self/maps if necessary
+    if (!addr_map_read_) {
+      addr_map_read_ = true;
+      if (!ReadAddrMap(RegisterObjFile, this, tmp_buf_, TMP_BUF_SIZE)) {
+        ok_ = false;
+        return nullptr;
+      }
+    }
+
+    int lo = 0;
+    int hi = addr_map_.Size();
+    while (lo < hi) {
+      int mid = (lo + hi) / 2;
+      if (addr < addr_map_.At(mid)->end_addr) {
+        hi = mid;
+      } else {
+        lo = mid + 1;
+      }
+    }
+    if (lo != addr_map_.Size()) {
+      ObjFile *obj = addr_map_.At(lo);
+      SAFE_ASSERT(obj->end_addr > addr);
+      if (addr >= obj->start_addr &&
+          reinterpret_cast<const char *>(addr) + len <= obj->end_addr)
+        return obj;
+    }
+
+    // The address mapping may have changed since it was last read.  Retry.
+    ClearAddrMap();
+  }
+  return nullptr;
+}
+
+void Symbolizer::ClearAddrMap() {
+  for (int i = 0; i != addr_map_.Size(); i++) {
+    ObjFile *o = addr_map_.At(i);
+    base_internal::LowLevelAlloc::Free(o->filename);
+    if (o->fd >= 0) {
+      NO_INTR(close(o->fd));
+    }
+  }
+  addr_map_.Clear();
+  addr_map_read_ = false;
+}
+
+// Callback for ReadAddrMap to register objfiles in an in-memory table.
+bool Symbolizer::RegisterObjFile(const char *filename,
+                                 const void *const start_addr,
+                                 const void *const end_addr, uint64_t offset,
+                                 void *arg) {
+  Symbolizer *impl = static_cast<Symbolizer *>(arg);
+
+  // Files are supposed to be added in the increasing address order.  Make
+  // sure that's the case.
+  int addr_map_size = impl->addr_map_.Size();
+  if (addr_map_size != 0) {
+    ObjFile *old = impl->addr_map_.At(addr_map_size - 1);
+    if (old->end_addr > end_addr) {
+      ABSL_RAW_LOG(ERROR,
+                   "Unsorted addr map entry: 0x%" PRIxPTR ": %s <-> 0x%" PRIxPTR
+                   ": %s",
+                   reinterpret_cast<uintptr_t>(end_addr), filename,
+                   reinterpret_cast<uintptr_t>(old->end_addr), old->filename);
+      return true;
+    } else if (old->end_addr == end_addr) {
+      // The same entry appears twice. This sometimes happens for [vdso].
+      if (old->start_addr != start_addr ||
+          strcmp(old->filename, filename) != 0) {
+        ABSL_RAW_LOG(ERROR,
+                     "Duplicate addr 0x%" PRIxPTR ": %s <-> 0x%" PRIxPTR ": %s",
+                     reinterpret_cast<uintptr_t>(end_addr), filename,
+                     reinterpret_cast<uintptr_t>(old->end_addr), old->filename);
+      }
+      return true;
+    }
+  }
+  ObjFile *obj = impl->addr_map_.Add();
+  obj->filename = impl->CopyString(filename);
+  obj->start_addr = start_addr;
+  obj->end_addr = end_addr;
+  obj->offset = offset;
+  obj->elf_type = -1;  // filled on demand
+  obj->fd = -1;        // opened on demand
+  return true;
+}
+
+// This function wraps the Demangle function to provide an interface
+// where the input symbol is demangled in-place.
+// To keep stack consumption low, we would like this function to not
+// get inlined.
+static ABSL_ATTRIBUTE_NOINLINE void DemangleInplace(char *out, int out_size,
+                                                    char *tmp_buf,
+                                                    int tmp_buf_size) {
+  if (Demangle(out, tmp_buf, tmp_buf_size)) {
+    // Demangling succeeded. Copy to out if the space allows.
+    int len = strlen(tmp_buf);
+    if (len + 1 <= out_size) {  // +1 for '\0'.
+      SAFE_ASSERT(len < tmp_buf_size);
+      memmove(out, tmp_buf, len + 1);
+    }
+  }
+}
+
+SymbolCacheLine *Symbolizer::GetCacheLine(const void *const pc) {
+  uintptr_t pc0 = reinterpret_cast<uintptr_t>(pc);
+  pc0 >>= 3;  // drop the low 3 bits
+
+  // Shuffle bits.
+  pc0 ^= (pc0 >> 6) ^ (pc0 >> 12) ^ (pc0 >> 18);
+  return &symbol_cache_[pc0 % SYMBOL_CACHE_LINES];
+}
+
+void Symbolizer::AgeSymbols(SymbolCacheLine *line) {
+  for (uint32_t &age : line->age) {
+    ++age;
+  }
+}
+
+const char *Symbolizer::FindSymbolInCache(const void *const pc) {
+  if (pc == nullptr) return nullptr;
+
+  SymbolCacheLine *line = GetCacheLine(pc);
+  for (size_t i = 0; i < ABSL_ARRAYSIZE(line->pc); ++i) {
+    if (line->pc[i] == pc) {
+      AgeSymbols(line);
+      line->age[i] = 0;
+      return line->name[i];
+    }
+  }
+  return nullptr;
+}
+
+const char *Symbolizer::InsertSymbolInCache(const void *const pc,
+                                            const char *name) {
+  SAFE_ASSERT(pc != nullptr);
+
+  SymbolCacheLine *line = GetCacheLine(pc);
+  uint32_t max_age = 0;
+  int oldest_index = -1;
+  for (size_t i = 0; i < ABSL_ARRAYSIZE(line->pc); ++i) {
+    if (line->pc[i] == nullptr) {
+      AgeSymbols(line);
+      line->pc[i] = pc;
+      line->name[i] = CopyString(name);
+      line->age[i] = 0;
+      return line->name[i];
+    }
+    if (line->age[i] >= max_age) {
+      max_age = line->age[i];
+      oldest_index = i;
+    }
+  }
+
+  AgeSymbols(line);
+  ABSL_RAW_CHECK(oldest_index >= 0, "Corrupt cache");
+  base_internal::LowLevelAlloc::Free(line->name[oldest_index]);
+  line->pc[oldest_index] = pc;
+  line->name[oldest_index] = CopyString(name);
+  line->age[oldest_index] = 0;
+  return line->name[oldest_index];
+}
+
+static void MaybeOpenFdFromSelfExe(ObjFile *obj) {
+  if (memcmp(obj->start_addr, ELFMAG, SELFMAG) != 0) {
+    return;
+  }
+  int fd = open("/proc/self/exe", O_RDONLY);
+  if (fd == -1) {
+    return;
+  }
+  // Verify that contents of /proc/self/exe matches in-memory image of
+  // the binary. This can fail if the "deleted" binary is in fact not
+  // the main executable, or for binaries that have the first PT_LOAD
+  // segment smaller than 4K. We do it in four steps so that the
+  // buffer is smaller and we don't consume too much stack space.
+  const char *mem = reinterpret_cast<const char *>(obj->start_addr);
+  for (int i = 0; i < 4; ++i) {
+    char buf[1024];
+    ssize_t n = read(fd, buf, sizeof(buf));
+    if (n != sizeof(buf) || memcmp(buf, mem, sizeof(buf)) != 0) {
+      close(fd);
+      return;
+    }
+    mem += sizeof(buf);
+  }
+  obj->fd = fd;
+}
+
+static bool MaybeInitializeObjFile(ObjFile *obj) {
+  if (obj->fd < 0) {
+    obj->fd = open(obj->filename, O_RDONLY);
+
+    if (obj->fd < 0) {
+      // Getting /proc/self/exe here means that we were hinted.
+      if (strcmp(obj->filename, "/proc/self/exe") == 0) {
+        // /proc/self/exe may be inaccessible (due to setuid, etc.), so try
+        // accessing the binary via argv0.
+        if (argv0_value != nullptr) {
+          obj->fd = open(argv0_value, O_RDONLY);
+        }
+      } else {
+        MaybeOpenFdFromSelfExe(obj);
+      }
+    }
+
+    if (obj->fd < 0) {
+      ABSL_RAW_LOG(WARNING, "%s: open failed: errno=%d", obj->filename, errno);
+      return false;
+    }
+    obj->elf_type = FileGetElfType(obj->fd);
+    if (obj->elf_type < 0) {
+      ABSL_RAW_LOG(WARNING, "%s: wrong elf type: %d", obj->filename,
+                   obj->elf_type);
+      return false;
+    }
+
+    if (!ReadFromOffsetExact(obj->fd, &obj->elf_header, sizeof(obj->elf_header),
+                             0)) {
+      ABSL_RAW_LOG(WARNING, "%s: failed to read elf header", obj->filename);
+      return false;
+    }
     const int phnum = obj->elf_header.e_phnum;
     const int phentsize = obj->elf_header.e_phentsize;
     size_t phoff = obj->elf_header.e_phoff;
@@ -1322,35 +1322,35 @@ static bool MaybeInitializeObjFile(ObjFile *obj) {
       ABSL_RAW_LOG(WARNING, "%s: no executable LOAD segments", obj->filename);
       return false;
     }
-  } 
-  return true; 
-} 
- 
-// The implementation of our symbolization routine.  If it 
-// successfully finds the symbol containing "pc" and obtains the 
-// symbol name, returns pointer to that symbol. Otherwise, returns nullptr. 
-// If any symbol decorators have been installed via InstallSymbolDecorator(), 
-// they are called here as well. 
-// To keep stack consumption low, we would like this function to not 
-// get inlined. 
-const char *Symbolizer::GetSymbol(const void *const pc) { 
-  const char *entry = FindSymbolInCache(pc); 
-  if (entry != nullptr) { 
-    return entry; 
-  } 
-  symbol_buf_[0] = '\0'; 
- 
-  ObjFile *const obj = FindObjFile(pc, 1); 
-  ptrdiff_t relocation = 0; 
-  int fd = -1; 
-  if (obj != nullptr) { 
-    if (MaybeInitializeObjFile(obj)) { 
+  }
+  return true;
+}
+
+// The implementation of our symbolization routine.  If it
+// successfully finds the symbol containing "pc" and obtains the
+// symbol name, returns pointer to that symbol. Otherwise, returns nullptr.
+// If any symbol decorators have been installed via InstallSymbolDecorator(),
+// they are called here as well.
+// To keep stack consumption low, we would like this function to not
+// get inlined.
+const char *Symbolizer::GetSymbol(const void *const pc) {
+  const char *entry = FindSymbolInCache(pc);
+  if (entry != nullptr) {
+    return entry;
+  }
+  symbol_buf_[0] = '\0';
+
+  ObjFile *const obj = FindObjFile(pc, 1);
+  ptrdiff_t relocation = 0;
+  int fd = -1;
+  if (obj != nullptr) {
+    if (MaybeInitializeObjFile(obj)) {
       const size_t start_addr = reinterpret_cast<size_t>(obj->start_addr);
       if (obj->elf_type == ET_DYN && start_addr >= obj->offset) {
-        // This object was relocated. 
-        // 
-        // For obj->offset > 0, adjust the relocation since a mapping at offset 
-        // X in the file will have a start address of [true relocation]+X. 
+        // This object was relocated.
+        //
+        // For obj->offset > 0, adjust the relocation since a mapping at offset
+        // X in the file will have a start address of [true relocation]+X.
         relocation = start_addr - obj->offset;
 
         // Note: some binaries have multiple "rx" LOAD segments. We must
@@ -1381,9 +1381,9 @@ const char *Symbolizer::GetSymbol(const void *const pc) {
           // binaries linked with BFD `ld -z separate-code`.
           relocation -= phdr->p_vaddr - phdr->p_offset;
         }
-      } 
- 
-      fd = obj->fd; 
+      }
+
+      fd = obj->fd;
       if (GetSymbolFromObjectFile(*obj, pc, relocation, symbol_buf_,
                                   sizeof(symbol_buf_), tmp_buf_,
                                   sizeof(tmp_buf_)) == SYMBOL_FOUND) {
@@ -1391,178 +1391,178 @@ const char *Symbolizer::GetSymbol(const void *const pc) {
         DemangleInplace(symbol_buf_, sizeof(symbol_buf_), tmp_buf_,
                         sizeof(tmp_buf_));
       }
-    } 
-  } else { 
-#if ABSL_HAVE_VDSO_SUPPORT 
-    VDSOSupport vdso; 
-    if (vdso.IsPresent()) { 
-      VDSOSupport::SymbolInfo symbol_info; 
-      if (vdso.LookupSymbolByAddress(pc, &symbol_info)) { 
-        // All VDSO symbols are known to be short. 
-        size_t len = strlen(symbol_info.name); 
-        ABSL_RAW_CHECK(len + 1 < sizeof(symbol_buf_), 
-                       "VDSO symbol unexpectedly long"); 
-        memcpy(symbol_buf_, symbol_info.name, len + 1); 
-      } 
-    } 
-#endif 
-  } 
- 
-  if (g_decorators_mu.TryLock()) { 
-    if (g_num_decorators > 0) { 
-      SymbolDecoratorArgs decorator_args = { 
-          pc,       relocation,       fd,     symbol_buf_, sizeof(symbol_buf_), 
-          tmp_buf_, sizeof(tmp_buf_), nullptr}; 
-      for (int i = 0; i < g_num_decorators; ++i) { 
-        decorator_args.arg = g_decorators[i].arg; 
-        g_decorators[i].fn(&decorator_args); 
-      } 
-    } 
-    g_decorators_mu.Unlock(); 
-  } 
-  if (symbol_buf_[0] == '\0') { 
-    return nullptr; 
-  } 
-  symbol_buf_[sizeof(symbol_buf_) - 1] = '\0';  // Paranoia. 
-  return InsertSymbolInCache(pc, symbol_buf_); 
-} 
- 
-bool RemoveAllSymbolDecorators(void) { 
-  if (!g_decorators_mu.TryLock()) { 
-    // Someone else is using decorators. Get out. 
-    return false; 
-  } 
-  g_num_decorators = 0; 
-  g_decorators_mu.Unlock(); 
-  return true; 
-} 
- 
-bool RemoveSymbolDecorator(int ticket) { 
-  if (!g_decorators_mu.TryLock()) { 
-    // Someone else is using decorators. Get out. 
-    return false; 
-  } 
-  for (int i = 0; i < g_num_decorators; ++i) { 
-    if (g_decorators[i].ticket == ticket) { 
-      while (i < g_num_decorators - 1) { 
-        g_decorators[i] = g_decorators[i + 1]; 
-        ++i; 
-      } 
-      g_num_decorators = i; 
-      break; 
-    } 
-  } 
-  g_decorators_mu.Unlock(); 
-  return true;  // Decorator is known to be removed. 
-} 
- 
-int InstallSymbolDecorator(SymbolDecorator decorator, void *arg) { 
-  static int ticket = 0; 
- 
-  if (!g_decorators_mu.TryLock()) { 
-    // Someone else is using decorators. Get out. 
+    }
+  } else {
+#if ABSL_HAVE_VDSO_SUPPORT
+    VDSOSupport vdso;
+    if (vdso.IsPresent()) {
+      VDSOSupport::SymbolInfo symbol_info;
+      if (vdso.LookupSymbolByAddress(pc, &symbol_info)) {
+        // All VDSO symbols are known to be short.
+        size_t len = strlen(symbol_info.name);
+        ABSL_RAW_CHECK(len + 1 < sizeof(symbol_buf_),
+                       "VDSO symbol unexpectedly long");
+        memcpy(symbol_buf_, symbol_info.name, len + 1);
+      }
+    }
+#endif
+  }
+
+  if (g_decorators_mu.TryLock()) {
+    if (g_num_decorators > 0) {
+      SymbolDecoratorArgs decorator_args = {
+          pc,       relocation,       fd,     symbol_buf_, sizeof(symbol_buf_),
+          tmp_buf_, sizeof(tmp_buf_), nullptr};
+      for (int i = 0; i < g_num_decorators; ++i) {
+        decorator_args.arg = g_decorators[i].arg;
+        g_decorators[i].fn(&decorator_args);
+      }
+    }
+    g_decorators_mu.Unlock();
+  }
+  if (symbol_buf_[0] == '\0') {
+    return nullptr;
+  }
+  symbol_buf_[sizeof(symbol_buf_) - 1] = '\0';  // Paranoia.
+  return InsertSymbolInCache(pc, symbol_buf_);
+}
+
+bool RemoveAllSymbolDecorators(void) {
+  if (!g_decorators_mu.TryLock()) {
+    // Someone else is using decorators. Get out.
+    return false;
+  }
+  g_num_decorators = 0;
+  g_decorators_mu.Unlock();
+  return true;
+}
+
+bool RemoveSymbolDecorator(int ticket) {
+  if (!g_decorators_mu.TryLock()) {
+    // Someone else is using decorators. Get out.
+    return false;
+  }
+  for (int i = 0; i < g_num_decorators; ++i) {
+    if (g_decorators[i].ticket == ticket) {
+      while (i < g_num_decorators - 1) {
+        g_decorators[i] = g_decorators[i + 1];
+        ++i;
+      }
+      g_num_decorators = i;
+      break;
+    }
+  }
+  g_decorators_mu.Unlock();
+  return true;  // Decorator is known to be removed.
+}
+
+int InstallSymbolDecorator(SymbolDecorator decorator, void *arg) {
+  static int ticket = 0;
+
+  if (!g_decorators_mu.TryLock()) {
+    // Someone else is using decorators. Get out.
     return -2;
-  } 
-  int ret = ticket; 
-  if (g_num_decorators >= kMaxDecorators) { 
-    ret = -1; 
-  } else { 
-    g_decorators[g_num_decorators] = {decorator, arg, ticket++}; 
-    ++g_num_decorators; 
-  } 
-  g_decorators_mu.Unlock(); 
-  return ret; 
-} 
- 
-bool RegisterFileMappingHint(const void *start, const void *end, uint64_t offset, 
-                             const char *filename) { 
-  SAFE_ASSERT(start <= end); 
-  SAFE_ASSERT(filename != nullptr); 
- 
-  InitSigSafeArena(); 
- 
-  if (!g_file_mapping_mu.TryLock()) { 
-    return false; 
-  } 
- 
-  bool ret = true; 
-  if (g_num_file_mapping_hints >= kMaxFileMappingHints) { 
-    ret = false; 
-  } else { 
+  }
+  int ret = ticket;
+  if (g_num_decorators >= kMaxDecorators) {
+    ret = -1;
+  } else {
+    g_decorators[g_num_decorators] = {decorator, arg, ticket++};
+    ++g_num_decorators;
+  }
+  g_decorators_mu.Unlock();
+  return ret;
+}
+
+bool RegisterFileMappingHint(const void *start, const void *end, uint64_t offset,
+                             const char *filename) {
+  SAFE_ASSERT(start <= end);
+  SAFE_ASSERT(filename != nullptr);
+
+  InitSigSafeArena();
+
+  if (!g_file_mapping_mu.TryLock()) {
+    return false;
+  }
+
+  bool ret = true;
+  if (g_num_file_mapping_hints >= kMaxFileMappingHints) {
+    ret = false;
+  } else {
     // TODO(ckennelly): Move this into a string copy routine.
-    int len = strlen(filename); 
-    char *dst = static_cast<char *>( 
-        base_internal::LowLevelAlloc::AllocWithArena(len + 1, SigSafeArena())); 
-    ABSL_RAW_CHECK(dst != nullptr, "out of memory"); 
-    memcpy(dst, filename, len + 1); 
- 
-    auto &hint = g_file_mapping_hints[g_num_file_mapping_hints++]; 
-    hint.start = start; 
-    hint.end = end; 
-    hint.offset = offset; 
-    hint.filename = dst; 
-  } 
- 
-  g_file_mapping_mu.Unlock(); 
-  return ret; 
-} 
- 
-bool GetFileMappingHint(const void **start, const void **end, uint64_t *offset, 
-                        const char **filename) { 
-  if (!g_file_mapping_mu.TryLock()) { 
-    return false; 
-  } 
-  bool found = false; 
-  for (int i = 0; i < g_num_file_mapping_hints; i++) { 
-    if (g_file_mapping_hints[i].start <= *start && 
-        *end <= g_file_mapping_hints[i].end) { 
-      // We assume that the start_address for the mapping is the base 
-      // address of the ELF section, but when [start_address,end_address) is 
-      // not strictly equal to [hint.start, hint.end), that assumption is 
-      // invalid. 
-      // 
-      // This uses the hint's start address (even though hint.start is not 
-      // necessarily equal to start_address) to ensure the correct 
-      // relocation is computed later. 
-      *start = g_file_mapping_hints[i].start; 
-      *end = g_file_mapping_hints[i].end; 
-      *offset = g_file_mapping_hints[i].offset; 
-      *filename = g_file_mapping_hints[i].filename; 
-      found = true; 
-      break; 
-    } 
-  } 
-  g_file_mapping_mu.Unlock(); 
-  return found; 
-} 
- 
-}  // namespace debugging_internal 
- 
-bool Symbolize(const void *pc, char *out, int out_size) { 
-  // Symbolization is very slow under tsan. 
+    int len = strlen(filename);
+    char *dst = static_cast<char *>(
+        base_internal::LowLevelAlloc::AllocWithArena(len + 1, SigSafeArena()));
+    ABSL_RAW_CHECK(dst != nullptr, "out of memory");
+    memcpy(dst, filename, len + 1);
+
+    auto &hint = g_file_mapping_hints[g_num_file_mapping_hints++];
+    hint.start = start;
+    hint.end = end;
+    hint.offset = offset;
+    hint.filename = dst;
+  }
+
+  g_file_mapping_mu.Unlock();
+  return ret;
+}
+
+bool GetFileMappingHint(const void **start, const void **end, uint64_t *offset,
+                        const char **filename) {
+  if (!g_file_mapping_mu.TryLock()) {
+    return false;
+  }
+  bool found = false;
+  for (int i = 0; i < g_num_file_mapping_hints; i++) {
+    if (g_file_mapping_hints[i].start <= *start &&
+        *end <= g_file_mapping_hints[i].end) {
+      // We assume that the start_address for the mapping is the base
+      // address of the ELF section, but when [start_address,end_address) is
+      // not strictly equal to [hint.start, hint.end), that assumption is
+      // invalid.
+      //
+      // This uses the hint's start address (even though hint.start is not
+      // necessarily equal to start_address) to ensure the correct
+      // relocation is computed later.
+      *start = g_file_mapping_hints[i].start;
+      *end = g_file_mapping_hints[i].end;
+      *offset = g_file_mapping_hints[i].offset;
+      *filename = g_file_mapping_hints[i].filename;
+      found = true;
+      break;
+    }
+  }
+  g_file_mapping_mu.Unlock();
+  return found;
+}
+
+}  // namespace debugging_internal
+
+bool Symbolize(const void *pc, char *out, int out_size) {
+  // Symbolization is very slow under tsan.
   ABSL_ANNOTATE_IGNORE_READS_AND_WRITES_BEGIN();
-  SAFE_ASSERT(out_size >= 0); 
-  debugging_internal::Symbolizer *s = debugging_internal::AllocateSymbolizer(); 
-  const char *name = s->GetSymbol(pc); 
-  bool ok = false; 
-  if (name != nullptr && out_size > 0) { 
-    strncpy(out, name, out_size); 
-    ok = true; 
-    if (out[out_size - 1] != '\0') { 
-      // strncpy() does not '\0' terminate when it truncates.  Do so, with 
-      // trailing ellipsis. 
-      static constexpr char kEllipsis[] = "..."; 
-      int ellipsis_size = 
-          std::min(implicit_cast<int>(strlen(kEllipsis)), out_size - 1); 
-      memcpy(out + out_size - ellipsis_size - 1, kEllipsis, ellipsis_size); 
-      out[out_size - 1] = '\0'; 
-    } 
-  } 
-  debugging_internal::FreeSymbolizer(s); 
+  SAFE_ASSERT(out_size >= 0);
+  debugging_internal::Symbolizer *s = debugging_internal::AllocateSymbolizer();
+  const char *name = s->GetSymbol(pc);
+  bool ok = false;
+  if (name != nullptr && out_size > 0) {
+    strncpy(out, name, out_size);
+    ok = true;
+    if (out[out_size - 1] != '\0') {
+      // strncpy() does not '\0' terminate when it truncates.  Do so, with
+      // trailing ellipsis.
+      static constexpr char kEllipsis[] = "...";
+      int ellipsis_size =
+          std::min(implicit_cast<int>(strlen(kEllipsis)), out_size - 1);
+      memcpy(out + out_size - ellipsis_size - 1, kEllipsis, ellipsis_size);
+      out[out_size - 1] = '\0';
+    }
+  }
+  debugging_internal::FreeSymbolizer(s);
   ABSL_ANNOTATE_IGNORE_READS_AND_WRITES_END();
-  return ok; 
-} 
- 
+  return ok;
+}
+
 ABSL_NAMESPACE_END
 }  // namespace y_absl
 
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/symbolize_unimplemented.inc b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/symbolize_unimplemented.inc
index 4375d767b8..4e55ed122f 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/symbolize_unimplemented.inc
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/symbolize_unimplemented.inc
@@ -1,40 +1,40 @@
-// Copyright 2018 The Abseil Authors. 
-// 
-// Licensed under the Apache License, Version 2.0 (the "License"); 
-// you may not use this file except in compliance with the License. 
-// You may obtain a copy of the License at 
-// 
-//      https://www.apache.org/licenses/LICENSE-2.0 
-// 
-// Unless required by applicable law or agreed to in writing, software 
-// distributed under the License is distributed on an "AS IS" BASIS, 
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
-// See the License for the specific language governing permissions and 
-// limitations under the License. 
- 
-#include <cstdint> 
- 
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <cstdint>
+
 #include "y_absl/base/internal/raw_logging.h"
- 
+
 namespace y_absl {
 ABSL_NAMESPACE_BEGIN
- 
-namespace debugging_internal { 
- 
-int InstallSymbolDecorator(SymbolDecorator, void*) { return -1; } 
-bool RemoveSymbolDecorator(int) { return false; } 
-bool RemoveAllSymbolDecorators(void) { return false; } 
-bool RegisterFileMappingHint(const void *, const void *, uint64_t, const char *) { 
-  return false; 
-} 
-bool GetFileMappingHint(const void **, const void **, uint64_t *, const char **) { 
-  return false; 
-} 
- 
-}  // namespace debugging_internal 
- 
-void InitializeSymbolizer(const char*) {} 
-bool Symbolize(const void *, char *, int) { return false; } 
- 
+
+namespace debugging_internal {
+
+int InstallSymbolDecorator(SymbolDecorator, void*) { return -1; }
+bool RemoveSymbolDecorator(int) { return false; }
+bool RemoveAllSymbolDecorators(void) { return false; }
+bool RegisterFileMappingHint(const void *, const void *, uint64_t, const char *) {
+  return false;
+}
+bool GetFileMappingHint(const void **, const void **, uint64_t *, const char **) {
+  return false;
+}
+
+}  // namespace debugging_internal
+
+void InitializeSymbolizer(const char*) {}
+bool Symbolize(const void *, char *, int) { return false; }
+
 ABSL_NAMESPACE_END
 }  // namespace y_absl
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/symbolize_win32.inc b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/symbolize_win32.inc
index 447bab62ae..81e0473f88 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/symbolize_win32.inc
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/symbolize_win32.inc
@@ -1,81 +1,81 @@
-// Copyright 2018 The Abseil Authors. 
-// 
-// Licensed under the Apache License, Version 2.0 (the "License"); 
-// you may not use this file except in compliance with the License. 
-// You may obtain a copy of the License at 
-// 
-//      https://www.apache.org/licenses/LICENSE-2.0 
-// 
-// Unless required by applicable law or agreed to in writing, software 
-// distributed under the License is distributed on an "AS IS" BASIS, 
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
-// See the License for the specific language governing permissions and 
-// limitations under the License. 
- 
-// See "Retrieving Symbol Information by Address": 
-// https://msdn.microsoft.com/en-us/library/windows/desktop/ms680578(v=vs.85).aspx 
- 
-#include <windows.h> 
- 
-// MSVC header dbghelp.h has a warning for an ignored typedef. 
-#pragma warning(push) 
-#pragma warning(disable:4091) 
-#include <dbghelp.h> 
-#pragma warning(pop) 
- 
-#pragma comment(lib, "dbghelp.lib") 
- 
-#include <algorithm> 
-#include <cstring> 
- 
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// See "Retrieving Symbol Information by Address":
+// https://msdn.microsoft.com/en-us/library/windows/desktop/ms680578(v=vs.85).aspx
+
+#include <windows.h>
+
+// MSVC header dbghelp.h has a warning for an ignored typedef.
+#pragma warning(push)
+#pragma warning(disable:4091)
+#include <dbghelp.h>
+#pragma warning(pop)
+
+#pragma comment(lib, "dbghelp.lib")
+
+#include <algorithm>
+#include <cstring>
+
 #include "y_absl/base/internal/raw_logging.h"
- 
+
 namespace y_absl {
 ABSL_NAMESPACE_BEGIN
- 
-static HANDLE process = NULL; 
- 
-void InitializeSymbolizer(const char*) { 
-  if (process != nullptr) { 
-    return; 
-  } 
-  process = GetCurrentProcess(); 
- 
-  // Symbols are not loaded until a reference is made requiring the 
-  // symbols be loaded. This is the fastest, most efficient way to use 
-  // the symbol handler. 
-  SymSetOptions(SYMOPT_DEFERRED_LOADS | SYMOPT_UNDNAME); 
-  if (!SymInitialize(process, nullptr, true)) { 
-    // GetLastError() returns a Win32 DWORD, but we assign to 
-    // unsigned long long to simplify the ABSL_RAW_LOG case below.  The uniform 
-    // initialization guarantees this is not a narrowing conversion. 
-    const unsigned long long error{GetLastError()};  // NOLINT(runtime/int) 
-    ABSL_RAW_LOG(FATAL, "SymInitialize() failed: %llu", error); 
-  } 
-} 
- 
-bool Symbolize(const void* pc, char* out, int out_size) { 
-  if (out_size <= 0) { 
-    return false; 
-  } 
-  alignas(SYMBOL_INFO) char buf[sizeof(SYMBOL_INFO) + MAX_SYM_NAME]; 
-  SYMBOL_INFO* symbol = reinterpret_cast<SYMBOL_INFO*>(buf); 
-  symbol->SizeOfStruct = sizeof(SYMBOL_INFO); 
-  symbol->MaxNameLen = MAX_SYM_NAME; 
-  if (!SymFromAddr(process, reinterpret_cast<DWORD64>(pc), nullptr, symbol)) { 
-    return false; 
-  } 
-  strncpy(out, symbol->Name, out_size); 
-  if (out[out_size - 1] != '\0') { 
-    // strncpy() does not '\0' terminate when it truncates. 
-    static constexpr char kEllipsis[] = "..."; 
-    int ellipsis_size = 
-        std::min<int>(sizeof(kEllipsis) - 1, out_size - 1); 
-    memcpy(out + out_size - ellipsis_size - 1, kEllipsis, ellipsis_size); 
-    out[out_size - 1] = '\0'; 
-  } 
-  return true; 
-} 
- 
+
+static HANDLE process = NULL;
+
+void InitializeSymbolizer(const char*) {
+  if (process != nullptr) {
+    return;
+  }
+  process = GetCurrentProcess();
+
+  // Symbols are not loaded until a reference is made requiring the
+  // symbols be loaded. This is the fastest, most efficient way to use
+  // the symbol handler.
+  SymSetOptions(SYMOPT_DEFERRED_LOADS | SYMOPT_UNDNAME);
+  if (!SymInitialize(process, nullptr, true)) {
+    // GetLastError() returns a Win32 DWORD, but we assign to
+    // unsigned long long to simplify the ABSL_RAW_LOG case below.  The uniform
+    // initialization guarantees this is not a narrowing conversion.
+    const unsigned long long error{GetLastError()};  // NOLINT(runtime/int)
+    ABSL_RAW_LOG(FATAL, "SymInitialize() failed: %llu", error);
+  }
+}
+
+bool Symbolize(const void* pc, char* out, int out_size) {
+  if (out_size <= 0) {
+    return false;
+  }
+  alignas(SYMBOL_INFO) char buf[sizeof(SYMBOL_INFO) + MAX_SYM_NAME];
+  SYMBOL_INFO* symbol = reinterpret_cast<SYMBOL_INFO*>(buf);
+  symbol->SizeOfStruct = sizeof(SYMBOL_INFO);
+  symbol->MaxNameLen = MAX_SYM_NAME;
+  if (!SymFromAddr(process, reinterpret_cast<DWORD64>(pc), nullptr, symbol)) {
+    return false;
+  }
+  strncpy(out, symbol->Name, out_size);
+  if (out[out_size - 1] != '\0') {
+    // strncpy() does not '\0' terminate when it truncates.
+    static constexpr char kEllipsis[] = "...";
+    int ellipsis_size =
+        std::min<int>(sizeof(kEllipsis) - 1, out_size - 1);
+    memcpy(out + out_size - ellipsis_size - 1, kEllipsis, ellipsis_size);
+    out[out_size - 1] = '\0';
+  }
+  return true;
+}
+
 ABSL_NAMESPACE_END
 }  // namespace y_absl
diff --git a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/ya.make b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/ya.make
index 186cc78f4d..d768f195c2 100644
--- a/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/ya.make
+++ b/contrib/restricted/abseil-cpp-tstring/y_absl/debugging/ya.make
@@ -1,31 +1,31 @@
-# Generated by devtools/yamaker. 
- 
-LIBRARY() 
- 
+# Generated by devtools/yamaker.
+
+LIBRARY()
+
 OWNER(
     somov
     g:cpp-contrib
 )
- 
-LICENSE(Apache-2.0) 
- 
+
+LICENSE(Apache-2.0)
+
 LICENSE_TEXTS(.yandex_meta/licenses.list.txt)
 
-PEERDIR( 
+PEERDIR(
     contrib/restricted/abseil-cpp-tstring/y_absl/base/internal/raw_logging
     contrib/restricted/abseil-cpp-tstring/y_absl/base/log_severity
-) 
- 
+)
+
 ADDINCL(
     GLOBAL contrib/restricted/abseil-cpp-tstring
 )
- 
-NO_COMPILER_WARNINGS() 
- 
-SRCS( 
-    internal/address_is_readable.cc 
-    internal/elf_mem_image.cc 
-    internal/vdso_support.cc 
-) 
- 
-END() 
+
+NO_COMPILER_WARNINGS()
+
+SRCS(
+    internal/address_is_readable.cc
+    internal/elf_mem_image.cc
+    internal/vdso_support.cc
+)
+
+END()