ydb-oss sync: add clang16-rt/ to additionalPathsToCopy

1 files changed, 745 insertions, 0 deletions

diff --git a/contrib/libs/clang16-rt/lib/msan/msan.cpp b/contrib/libs/clang16-rt/lib/msan/msan.cpp
new file mode 100644
index 0000000000..3e3bc3cb97
--- /dev/null
+++ b/contrib/libs/clang16-rt/lib/msan/msan.cpp
@@ -0,0 +1,745 @@
+//===-- msan.cpp ----------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of MemorySanitizer.
+//
+// MemorySanitizer runtime.
+//===----------------------------------------------------------------------===//
+
+#include "msan.h"
+
+#include "msan_chained_origin_depot.h"
+#include "msan_origin.h"
+#include "msan_poisoning.h"
+#include "msan_report.h"
+#include "msan_thread.h"
+#include "sanitizer_common/sanitizer_atomic.h"
+#include "sanitizer_common/sanitizer_common.h"
+#include "sanitizer_common/sanitizer_flag_parser.h"
+#include "sanitizer_common/sanitizer_flags.h"
+#include "sanitizer_common/sanitizer_interface_internal.h"
+#include "sanitizer_common/sanitizer_libc.h"
+#include "sanitizer_common/sanitizer_procmaps.h"
+#include "sanitizer_common/sanitizer_stackdepot.h"
+#include "sanitizer_common/sanitizer_stacktrace.h"
+#include "sanitizer_common/sanitizer_symbolizer.h"
+#include "ubsan/ubsan_flags.h"
+#include "ubsan/ubsan_init.h"
+
+// ACHTUNG! No system header includes in this file.
+
+using namespace __sanitizer;
+
+// Globals.
+static THREADLOCAL int msan_expect_umr = 0;
+static THREADLOCAL int msan_expected_umr_found = 0;
+
+// Function argument shadow. Each argument starts at the next available 8-byte
+// aligned address.
+SANITIZER_INTERFACE_ATTRIBUTE
+THREADLOCAL u64 __msan_param_tls[kMsanParamTlsSize / sizeof(u64)];
+
+// Function argument origin. Each argument starts at the same offset as the
+// corresponding shadow in (__msan_param_tls). Slightly weird, but changing this
+// would break compatibility with older prebuilt binaries.
+SANITIZER_INTERFACE_ATTRIBUTE
+THREADLOCAL u32 __msan_param_origin_tls[kMsanParamTlsSize / sizeof(u32)];
+
+SANITIZER_INTERFACE_ATTRIBUTE
+THREADLOCAL u64 __msan_retval_tls[kMsanRetvalTlsSize / sizeof(u64)];
+
+SANITIZER_INTERFACE_ATTRIBUTE
+THREADLOCAL u32 __msan_retval_origin_tls;
+
+SANITIZER_INTERFACE_ATTRIBUTE
+ALIGNED(16) THREADLOCAL u64 __msan_va_arg_tls[kMsanParamTlsSize / sizeof(u64)];
+
+SANITIZER_INTERFACE_ATTRIBUTE
+ALIGNED(16)
+THREADLOCAL u32 __msan_va_arg_origin_tls[kMsanParamTlsSize / sizeof(u32)];
+
+SANITIZER_INTERFACE_ATTRIBUTE
+THREADLOCAL u64 __msan_va_arg_overflow_size_tls;
+
+SANITIZER_INTERFACE_ATTRIBUTE
+THREADLOCAL u32 __msan_origin_tls;
+
+extern "C" SANITIZER_WEAK_ATTRIBUTE const int __msan_track_origins;
+
+int __msan_get_track_origins() {
+  return &__msan_track_origins ? __msan_track_origins : 0;
+}
+
+extern "C" SANITIZER_WEAK_ATTRIBUTE const int __msan_keep_going;
+
+namespace __msan {
+
+static THREADLOCAL int is_in_symbolizer_or_unwinder;
+static void EnterSymbolizerOrUnwider() { ++is_in_symbolizer_or_unwinder; }
+static void ExitSymbolizerOrUnwider() { --is_in_symbolizer_or_unwinder; }
+bool IsInSymbolizerOrUnwider() { return is_in_symbolizer_or_unwinder; }
+
+struct UnwinderScope {
+  UnwinderScope() { EnterSymbolizerOrUnwider(); }
+  ~UnwinderScope() { ExitSymbolizerOrUnwider(); }
+};
+
+static Flags msan_flags;
+
+Flags *flags() { return &msan_flags; }
+
+int msan_inited = 0;
+bool msan_init_is_running;
+
+int msan_report_count = 0;
+
+// Array of stack origins.
+// FIXME: make it resizable.
+static const uptr kNumStackOriginDescrs = 1024 * 1024;
+static const char *StackOriginDescr[kNumStackOriginDescrs];
+static uptr StackOriginPC[kNumStackOriginDescrs];
+static atomic_uint32_t NumStackOriginDescrs;
+
+void Flags::SetDefaults() {
+#define MSAN_FLAG(Type, Name, DefaultValue, Description) Name = DefaultValue;
+#include "msan_flags.inc"
+#undef MSAN_FLAG
+}
+
+// keep_going is an old name for halt_on_error,
+// and it has inverse meaning.
+class FlagHandlerKeepGoing final : public FlagHandlerBase {
+  bool *halt_on_error_;
+
+ public:
+  explicit FlagHandlerKeepGoing(bool *halt_on_error)
+      : halt_on_error_(halt_on_error) {}
+  bool Parse(const char *value) final {
+    bool tmp;
+    FlagHandler<bool> h(&tmp);
+    if (!h.Parse(value)) return false;
+    *halt_on_error_ = !tmp;
+    return true;
+  }
+  bool Format(char *buffer, uptr size) final {
+    const char *keep_going_str = (*halt_on_error_) ? "false" : "true";
+    return FormatString(buffer, size, keep_going_str);
+  }
+};
+
+static void RegisterMsanFlags(FlagParser *parser, Flags *f) {
+#define MSAN_FLAG(Type, Name, DefaultValue, Description) \
+  RegisterFlag(parser, #Name, Description, &f->Name);
+#include "msan_flags.inc"
+#undef MSAN_FLAG
+
+  FlagHandlerKeepGoing *fh_keep_going =
+      new (FlagParser::Alloc) FlagHandlerKeepGoing(&f->halt_on_error);
+  parser->RegisterHandler("keep_going", fh_keep_going,
+                          "deprecated, use halt_on_error");
+}
+
+static void InitializeFlags() {
+  SetCommonFlagsDefaults();
+  {
+    CommonFlags cf;
+    cf.CopyFrom(*common_flags());
+    cf.external_symbolizer_path = GetEnv("MSAN_SYMBOLIZER_PATH");
+    cf.malloc_context_size = 20;
+    cf.handle_ioctl = true;
+    // FIXME: test and enable.
+    cf.check_printf = false;
+    cf.intercept_tls_get_addr = true;
+    OverrideCommonFlags(cf);
+  }
+
+  Flags *f = flags();
+  f->SetDefaults();
+
+  FlagParser parser;
+  RegisterMsanFlags(&parser, f);
+  RegisterCommonFlags(&parser);
+
+#if MSAN_CONTAINS_UBSAN
+  __ubsan::Flags *uf = __ubsan::flags();
+  uf->SetDefaults();
+
+  FlagParser ubsan_parser;
+  __ubsan::RegisterUbsanFlags(&ubsan_parser, uf);
+  RegisterCommonFlags(&ubsan_parser);
+#endif
+
+  // Override from user-specified string.
+  parser.ParseString(__msan_default_options());
+#if MSAN_CONTAINS_UBSAN
+  const char *ubsan_default_options = __ubsan_default_options();
+  ubsan_parser.ParseString(ubsan_default_options);
+#endif
+
+  parser.ParseStringFromEnv("MSAN_OPTIONS");
+#if MSAN_CONTAINS_UBSAN
+  ubsan_parser.ParseStringFromEnv("UBSAN_OPTIONS");
+#endif
+
+  InitializeCommonFlags();
+
+  if (Verbosity()) ReportUnrecognizedFlags();
+
+  if (common_flags()->help) parser.PrintFlagDescriptions();
+
+  // Check if deprecated exit_code MSan flag is set.
+  if (f->exit_code != -1) {
+    if (Verbosity())
+      Printf("MSAN_OPTIONS=exit_code is deprecated! "
+             "Please use MSAN_OPTIONS=exitcode instead.\n");
+    CommonFlags cf;
+    cf.CopyFrom(*common_flags());
+    cf.exitcode = f->exit_code;
+    OverrideCommonFlags(cf);
+  }
+
+  // Check flag values:
+  if (f->origin_history_size < 0 ||
+      f->origin_history_size > Origin::kMaxDepth) {
+    Printf(
+        "Origin history size invalid: %d. Must be 0 (unlimited) or in [1, %d] "
+        "range.\n",
+        f->origin_history_size, Origin::kMaxDepth);
+    Die();
+  }
+  // Limiting to kStackDepotMaxUseCount / 2 to avoid overflow in
+  // StackDepotHandle::inc_use_count_unsafe.
+  if (f->origin_history_per_stack_limit < 0 ||
+      f->origin_history_per_stack_limit > kStackDepotMaxUseCount / 2) {
+    Printf(
+        "Origin per-stack limit invalid: %d. Must be 0 (unlimited) or in [1, "
+        "%d] range.\n",
+        f->origin_history_per_stack_limit, kStackDepotMaxUseCount / 2);
+    Die();
+  }
+  if (f->store_context_size < 1) f->store_context_size = 1;
+}
+
+void PrintWarningWithOrigin(uptr pc, uptr bp, u32 origin) {
+  if (msan_expect_umr) {
+    // Printf("Expected UMR\n");
+    __msan_origin_tls = origin;
+    msan_expected_umr_found = 1;
+    return;
+  }
+
+  ++msan_report_count;
+
+  GET_FATAL_STACK_TRACE_PC_BP(pc, bp);
+
+  u32 report_origin =
+    (__msan_get_track_origins() && Origin::isValidId(origin)) ? origin : 0;
+  ReportUMR(&stack, report_origin);
+
+  if (__msan_get_track_origins() && !Origin::isValidId(origin)) {
+    Printf(
+        "  ORIGIN: invalid (%x). Might be a bug in MemorySanitizer origin "
+        "tracking.\n    This could still be a bug in your code, too!\n",
+        origin);
+  }
+}
+
+void UnpoisonParam(uptr n) {
+  internal_memset(__msan_param_tls, 0, n * sizeof(*__msan_param_tls));
+}
+
+// Backup MSan runtime TLS state.
+// Implementation must be async-signal-safe.
+// Instances of this class may live on the signal handler stack, and data size
+// may be an issue.
+void ScopedThreadLocalStateBackup::Backup() {
+  va_arg_overflow_size_tls = __msan_va_arg_overflow_size_tls;
+}
+
+void ScopedThreadLocalStateBackup::Restore() {
+  // A lame implementation that only keeps essential state and resets the rest.
+  __msan_va_arg_overflow_size_tls = va_arg_overflow_size_tls;
+
+  internal_memset(__msan_param_tls, 0, sizeof(__msan_param_tls));
+  internal_memset(__msan_retval_tls, 0, sizeof(__msan_retval_tls));
+  internal_memset(__msan_va_arg_tls, 0, sizeof(__msan_va_arg_tls));
+  internal_memset(__msan_va_arg_origin_tls, 0,
+                  sizeof(__msan_va_arg_origin_tls));
+
+  if (__msan_get_track_origins()) {
+    internal_memset(&__msan_retval_origin_tls, 0,
+                    sizeof(__msan_retval_origin_tls));
+    internal_memset(__msan_param_origin_tls, 0,
+                    sizeof(__msan_param_origin_tls));
+  }
+}
+
+void UnpoisonThreadLocalState() {
+}
+
+const char *GetStackOriginDescr(u32 id, uptr *pc) {
+  CHECK_LT(id, kNumStackOriginDescrs);
+  if (pc) *pc = StackOriginPC[id];
+  return StackOriginDescr[id];
+}
+
+u32 ChainOrigin(u32 id, StackTrace *stack) {
+  MsanThread *t = GetCurrentThread();
+  if (t && t->InSignalHandler())
+    return id;
+
+  Origin o = Origin::FromRawId(id);
+  stack->tag = StackTrace::TAG_UNKNOWN;
+  Origin chained = Origin::CreateChainedOrigin(o, stack);
+  return chained.raw_id();
+}
+
+// Current implementation separates the 'id_ptr' from the 'descr' and makes
+// 'descr' constant.
+// Previous implementation 'descr' is created at compile time and contains
+// '----' in the beginning.  When we see descr for the first time we replace
+// '----' with a uniq id and set the origin to (id | (31-th bit)).
+static inline void SetAllocaOrigin(void *a, uptr size, u32 *id_ptr, char *descr,
+                                   uptr pc) {
+  static const u32 dash = '-';
+  static const u32 first_timer =
+      dash + (dash << 8) + (dash << 16) + (dash << 24);
+  u32 id = *id_ptr;
+  if (id == 0 || id == first_timer) {
+    u32 idx = atomic_fetch_add(&NumStackOriginDescrs, 1, memory_order_relaxed);
+    CHECK_LT(idx, kNumStackOriginDescrs);
+    StackOriginDescr[idx] = descr;
+    StackOriginPC[idx] = pc;
+    id = Origin::CreateStackOrigin(idx).raw_id();
+    *id_ptr = id;
+  }
+  __msan_set_origin(a, size, id);
+}
+
+}  // namespace __msan
+
+void __sanitizer::BufferedStackTrace::UnwindImpl(
+    uptr pc, uptr bp, void *context, bool request_fast, u32 max_depth) {
+  using namespace __msan;
+  MsanThread *t = GetCurrentThread();
+  if (!t || !StackTrace::WillUseFastUnwind(request_fast)) {
+    // Block reports from our interceptors during _Unwind_Backtrace.
+    UnwinderScope sym_scope;
+    return Unwind(max_depth, pc, bp, context, t ? t->stack_top() : 0,
+                  t ? t->stack_bottom() : 0, false);
+  }
+  if (StackTrace::WillUseFastUnwind(request_fast))
+    Unwind(max_depth, pc, bp, nullptr, t->stack_top(), t->stack_bottom(), true);
+  else
+    Unwind(max_depth, pc, 0, context, 0, 0, false);
+}
+
+// Interface.
+
+using namespace __msan;
+
+#define MSAN_MAYBE_WARNING(type, size)              \
+  void __msan_maybe_warning_##size(type s, u32 o) { \
+    GET_CALLER_PC_BP_SP;                            \
+    (void) sp;                                      \
+    if (UNLIKELY(s)) {                              \
+      PrintWarningWithOrigin(pc, bp, o);            \
+      if (__msan::flags()->halt_on_error) {         \
+        Printf("Exiting\n");                        \
+        Die();                                      \
+      }                                             \
+    }                                               \
+  }
+
+MSAN_MAYBE_WARNING(u8, 1)
+MSAN_MAYBE_WARNING(u16, 2)
+MSAN_MAYBE_WARNING(u32, 4)
+MSAN_MAYBE_WARNING(u64, 8)
+
+#define MSAN_MAYBE_STORE_ORIGIN(type, size)                       \
+  void __msan_maybe_store_origin_##size(type s, void *p, u32 o) { \
+    if (UNLIKELY(s)) {                                            \
+      if (__msan_get_track_origins() > 1) {                       \
+        GET_CALLER_PC_BP_SP;                                      \
+        (void) sp;                                                \
+        GET_STORE_STACK_TRACE_PC_BP(pc, bp);                      \
+        o = ChainOrigin(o, &stack);                               \
+      }                                                           \
+      *(u32 *)MEM_TO_ORIGIN((uptr)p & ~3UL) = o;                  \
+    }                                                             \
+  }
+
+MSAN_MAYBE_STORE_ORIGIN(u8, 1)
+MSAN_MAYBE_STORE_ORIGIN(u16, 2)
+MSAN_MAYBE_STORE_ORIGIN(u32, 4)
+MSAN_MAYBE_STORE_ORIGIN(u64, 8)
+
+void __msan_warning() {
+  GET_CALLER_PC_BP_SP;
+  (void)sp;
+  PrintWarningWithOrigin(pc, bp, 0);
+  if (__msan::flags()->halt_on_error) {
+    if (__msan::flags()->print_stats)
+      ReportStats();
+    Printf("Exiting\n");
+    Die();
+  }
+}
+
+void __msan_warning_noreturn() {
+  GET_CALLER_PC_BP_SP;
+  (void)sp;
+  PrintWarningWithOrigin(pc, bp, 0);
+  if (__msan::flags()->print_stats)
+    ReportStats();
+  Printf("Exiting\n");
+  Die();
+}
+
+void __msan_warning_with_origin(u32 origin) {
+  GET_CALLER_PC_BP_SP;
+  (void)sp;
+  PrintWarningWithOrigin(pc, bp, origin);
+  if (__msan::flags()->halt_on_error) {
+    if (__msan::flags()->print_stats)
+      ReportStats();
+    Printf("Exiting\n");
+    Die();
+  }
+}
+
+void __msan_warning_with_origin_noreturn(u32 origin) {
+  GET_CALLER_PC_BP_SP;
+  (void)sp;
+  PrintWarningWithOrigin(pc, bp, origin);
+  if (__msan::flags()->print_stats)
+    ReportStats();
+  Printf("Exiting\n");
+  Die();
+}
+
+static void OnStackUnwind(const SignalContext &sig, const void *,
+                          BufferedStackTrace *stack) {
+  stack->Unwind(StackTrace::GetNextInstructionPc(sig.pc), sig.bp, sig.context,
+                common_flags()->fast_unwind_on_fatal);
+}
+
+static void MsanOnDeadlySignal(int signo, void *siginfo, void *context) {
+  HandleDeadlySignal(siginfo, context, GetTid(), &OnStackUnwind, nullptr);
+}
+
+static void CheckUnwind() {
+  GET_FATAL_STACK_TRACE_PC_BP(StackTrace::GetCurrentPc(), GET_CURRENT_FRAME());
+  stack.Print();
+}
+
+void __msan_init() {
+  CHECK(!msan_init_is_running);
+  if (msan_inited) return;
+  msan_init_is_running = 1;
+  SanitizerToolName = "MemorySanitizer";
+
+  AvoidCVE_2016_2143();
+
+  CacheBinaryName();
+  InitializeFlags();
+
+  // Install tool-specific callbacks in sanitizer_common.
+  SetCheckUnwindCallback(CheckUnwind);
+
+  __sanitizer_set_report_path(common_flags()->log_path);
+
+  InitializeInterceptors();
+  CheckASLR();
+  InitTlsSize();
+  InstallDeadlySignalHandlers(MsanOnDeadlySignal);
+  InstallAtExitHandler(); // Needs __cxa_atexit interceptor.
+
+  DisableCoreDumperIfNecessary();
+  if (StackSizeIsUnlimited()) {
+    VPrintf(1, "Unlimited stack, doing reexec\n");
+    // A reasonably large stack size. It is bigger than the usual 8Mb, because,
+    // well, the program could have been run with unlimited stack for a reason.
+    SetStackSizeLimitInBytes(32 * 1024 * 1024);
+    ReExec();
+  }
+
+  __msan_clear_on_return();
+  if (__msan_get_track_origins())
+    VPrintf(1, "msan_track_origins\n");
+  if (!InitShadow(__msan_get_track_origins())) {
+    Printf("FATAL: MemorySanitizer can not mmap the shadow memory.\n");
+    Printf("FATAL: Make sure to compile with -fPIE and to link with -pie.\n");
+    Printf("FATAL: Disabling ASLR is known to cause this error.\n");
+    Printf("FATAL: If running under GDB, try "
+           "'set disable-randomization off'.\n");
+    DumpProcessMap();
+    Die();
+  }
+
+  Symbolizer::GetOrInit()->AddHooks(EnterSymbolizerOrUnwider,
+                                    ExitSymbolizerOrUnwider);
+
+  InitializeCoverage(common_flags()->coverage, common_flags()->coverage_dir);
+
+  MsanTSDInit(MsanTSDDtor);
+
+  MsanAllocatorInit();
+
+  MsanThread *main_thread = MsanThread::Create(nullptr, nullptr);
+  SetCurrentThread(main_thread);
+  main_thread->Init();
+
+#if MSAN_CONTAINS_UBSAN
+  __ubsan::InitAsPlugin();
+#endif
+
+  VPrintf(1, "MemorySanitizer init done\n");
+
+  msan_init_is_running = 0;
+  msan_inited = 1;
+}
+
+void __msan_set_keep_going(int keep_going) {
+  flags()->halt_on_error = !keep_going;
+}
+
+void __msan_set_expect_umr(int expect_umr) {
+  if (expect_umr) {
+    msan_expected_umr_found = 0;
+  } else if (!msan_expected_umr_found) {
+    GET_CALLER_PC_BP_SP;
+    (void)sp;
+    GET_FATAL_STACK_TRACE_PC_BP(pc, bp);
+    ReportExpectedUMRNotFound(&stack);
+    Die();
+  }
+  msan_expect_umr = expect_umr;
+}
+
+void __msan_print_shadow(const void *x, uptr size) {
+  if (!MEM_IS_APP(x)) {
+    Printf("Not a valid application address: %p\n", x);
+    return;
+  }
+
+  DescribeMemoryRange(x, size);
+}
+
+void __msan_dump_shadow(const void *x, uptr size) {
+  if (!MEM_IS_APP(x)) {
+    Printf("Not a valid application address: %p\n", x);
+    return;
+  }
+
+  unsigned char *s = (unsigned char*)MEM_TO_SHADOW(x);
+  Printf("%p[%p]  ", (void *)s, x);
+  for (uptr i = 0; i < size; i++)
+    Printf("%x%x ", s[i] >> 4, s[i] & 0xf);
+  Printf("\n");
+}
+
+sptr __msan_test_shadow(const void *x, uptr size) {
+  if (!MEM_IS_APP(x)) return -1;
+  unsigned char *s = (unsigned char *)MEM_TO_SHADOW((uptr)x);
+  if (__sanitizer::mem_is_zero((const char *)s, size))
+    return -1;
+  // Slow path: loop through again to find the location.
+  for (uptr i = 0; i < size; ++i)
+    if (s[i])
+      return i;
+  return -1;
+}
+
+void __msan_check_mem_is_initialized(const void *x, uptr size) {
+  if (!__msan::flags()->report_umrs) return;
+  sptr offset = __msan_test_shadow(x, size);
+  if (offset < 0)
+    return;
+
+  GET_CALLER_PC_BP_SP;
+  (void)sp;
+  ReportUMRInsideAddressRange(__func__, x, size, offset);
+  __msan::PrintWarningWithOrigin(pc, bp,
+                                 __msan_get_origin(((const char *)x) + offset));
+  if (__msan::flags()->halt_on_error) {
+    Printf("Exiting\n");
+    Die();
+  }
+}
+
+int __msan_set_poison_in_malloc(int do_poison) {
+  int old = flags()->poison_in_malloc;
+  flags()->poison_in_malloc = do_poison;
+  return old;
+}
+
+int __msan_has_dynamic_component() { return false; }
+
+NOINLINE
+void __msan_clear_on_return() {
+  __msan_param_tls[0] = 0;
+}
+
+void __msan_partial_poison(const void* data, void* shadow, uptr size) {
+  internal_memcpy((void*)MEM_TO_SHADOW((uptr)data), shadow, size);
+}
+
+void __msan_load_unpoisoned(const void *src, uptr size, void *dst) {
+  internal_memcpy(dst, src, size);
+  __msan_unpoison(dst, size);
+}
+
+void __msan_set_origin(const void *a, uptr size, u32 origin) {
+  if (__msan_get_track_origins()) SetOrigin(a, size, origin);
+}
+
+void __msan_set_alloca_origin(void *a, uptr size, char *descr) {
+  SetAllocaOrigin(a, size, reinterpret_cast<u32 *>(descr), descr + 4,
+                  GET_CALLER_PC());
+}
+
+void __msan_set_alloca_origin4(void *a, uptr size, char *descr, uptr pc) {
+  // Intentionally ignore pc and use return address. This function is here for
+  // compatibility, in case program is linked with library instrumented by
+  // older clang.
+  SetAllocaOrigin(a, size, reinterpret_cast<u32 *>(descr), descr + 4,
+                  GET_CALLER_PC());
+}
+
+void __msan_set_alloca_origin_with_descr(void *a, uptr size, u32 *id_ptr,
+                                         char *descr) {
+  SetAllocaOrigin(a, size, id_ptr, descr, GET_CALLER_PC());
+}
+
+void __msan_set_alloca_origin_no_descr(void *a, uptr size, u32 *id_ptr) {
+  SetAllocaOrigin(a, size, id_ptr, nullptr, GET_CALLER_PC());
+}
+
+u32 __msan_chain_origin(u32 id) {
+  GET_CALLER_PC_BP_SP;
+  (void)sp;
+  GET_STORE_STACK_TRACE_PC_BP(pc, bp);
+  return ChainOrigin(id, &stack);
+}
+
+u32 __msan_get_origin(const void *a) {
+  if (!__msan_get_track_origins()) return 0;
+  uptr x = (uptr)a;
+  uptr aligned = x & ~3ULL;
+  uptr origin_ptr = MEM_TO_ORIGIN(aligned);
+  return *(u32*)origin_ptr;
+}
+
+int __msan_origin_is_descendant_or_same(u32 this_id, u32 prev_id) {
+  Origin o = Origin::FromRawId(this_id);
+  while (o.raw_id() != prev_id && o.isChainedOrigin())
+    o = o.getNextChainedOrigin(nullptr);
+  return o.raw_id() == prev_id;
+}
+
+u32 __msan_get_umr_origin() {
+  return __msan_origin_tls;
+}
+
+u16 __sanitizer_unaligned_load16(const uu16 *p) {
+  internal_memcpy(&__msan_retval_tls[0], (void *)MEM_TO_SHADOW((uptr)p),
+                  sizeof(uu16));
+  if (__msan_get_track_origins())
+    __msan_retval_origin_tls = GetOriginIfPoisoned((uptr)p, sizeof(*p));
+  return *p;
+}
+u32 __sanitizer_unaligned_load32(const uu32 *p) {
+  internal_memcpy(&__msan_retval_tls[0], (void *)MEM_TO_SHADOW((uptr)p),
+                  sizeof(uu32));
+  if (__msan_get_track_origins())
+    __msan_retval_origin_tls = GetOriginIfPoisoned((uptr)p, sizeof(*p));
+  return *p;
+}
+u64 __sanitizer_unaligned_load64(const uu64 *p) {
+  internal_memcpy(&__msan_retval_tls[0], (void *)MEM_TO_SHADOW((uptr)p),
+                  sizeof(uu64));
+  if (__msan_get_track_origins())
+    __msan_retval_origin_tls = GetOriginIfPoisoned((uptr)p, sizeof(*p));
+  return *p;
+}
+void __sanitizer_unaligned_store16(uu16 *p, u16 x) {
+  static_assert(sizeof(uu16) == sizeof(u16), "incompatible types");
+  u16 s;
+  internal_memcpy(&s, &__msan_param_tls[1], sizeof(uu16));
+  internal_memcpy((void *)MEM_TO_SHADOW((uptr)p), &s, sizeof(uu16));
+  if (s && __msan_get_track_origins())
+    if (uu32 o = __msan_param_origin_tls[2])
+      SetOriginIfPoisoned((uptr)p, (uptr)&s, sizeof(s), o);
+  *p = x;
+}
+void __sanitizer_unaligned_store32(uu32 *p, u32 x) {
+  static_assert(sizeof(uu32) == sizeof(u32), "incompatible types");
+  u32 s;
+  internal_memcpy(&s, &__msan_param_tls[1], sizeof(uu32));
+  internal_memcpy((void *)MEM_TO_SHADOW((uptr)p), &s, sizeof(uu32));
+  if (s && __msan_get_track_origins())
+    if (uu32 o = __msan_param_origin_tls[2])
+      SetOriginIfPoisoned((uptr)p, (uptr)&s, sizeof(s), o);
+  *p = x;
+}
+void __sanitizer_unaligned_store64(uu64 *p, u64 x) {
+  u64 s = __msan_param_tls[1];
+  *(uu64 *)MEM_TO_SHADOW((uptr)p) = s;
+  if (s && __msan_get_track_origins())
+    if (uu32 o = __msan_param_origin_tls[2])
+      SetOriginIfPoisoned((uptr)p, (uptr)&s, sizeof(s), o);
+  *p = x;
+}
+
+void __msan_set_death_callback(void (*callback)(void)) {
+  SetUserDieCallback(callback);
+}
+
+void __msan_start_switch_fiber(const void *bottom, uptr size) {
+  MsanThread *t = GetCurrentThread();
+  if (!t) {
+    VReport(1, "__msan_start_switch_fiber called from unknown thread\n");
+    return;
+  }
+  t->StartSwitchFiber((uptr)bottom, size);
+}
+
+void __msan_finish_switch_fiber(const void **bottom_old, uptr *size_old) {
+  MsanThread *t = GetCurrentThread();
+  if (!t) {
+    VReport(1, "__msan_finish_switch_fiber called from unknown thread\n");
+    return;
+  }
+  t->FinishSwitchFiber((uptr *)bottom_old, (uptr *)size_old);
+
+  internal_memset(__msan_param_tls, 0, sizeof(__msan_param_tls));
+  internal_memset(__msan_retval_tls, 0, sizeof(__msan_retval_tls));
+  internal_memset(__msan_va_arg_tls, 0, sizeof(__msan_va_arg_tls));
+
+  if (__msan_get_track_origins()) {
+    internal_memset(__msan_param_origin_tls, 0,
+                    sizeof(__msan_param_origin_tls));
+    internal_memset(&__msan_retval_origin_tls, 0,
+                    sizeof(__msan_retval_origin_tls));
+    internal_memset(__msan_va_arg_origin_tls, 0,
+                    sizeof(__msan_va_arg_origin_tls));
+  }
+}
+
+SANITIZER_INTERFACE_WEAK_DEF(const char *, __msan_default_options, void) {
+  return "";
+}
+
+extern "C" {
+SANITIZER_INTERFACE_ATTRIBUTE
+void __sanitizer_print_stack_trace() {
+  GET_FATAL_STACK_TRACE_PC_BP(StackTrace::GetCurrentPc(), GET_CURRENT_FRAME());
+  stack.Print();
+}
+} // extern "C"