intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

13 files changed, 4103 insertions, 0 deletions

diff --git a/contrib/libs/llvm12/lib/Support/Unix/COM.inc b/contrib/libs/llvm12/lib/Support/Unix/COM.inc
new file mode 100644
index 00000000000..03a690ac376
--- /dev/null
+++ b/contrib/libs/llvm12/lib/Support/Unix/COM.inc
@@ -0,0 +1,26 @@
+//===- llvm/Support/Unix/COM.inc - Unix COM Implementation -----*- C++ -*-===//
+//
+// 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 implements the Unix portion of COM support.
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only generic UNIX code that
+//===          is guaranteed to work on *all* UNIX variants.
+//===----------------------------------------------------------------------===//
+
+namespace llvm {
+namespace sys {
+
+InitializeCOMRAII::InitializeCOMRAII(COMThreadingMode Threading,
+                                     bool SpeedOverMemory) {}
+
+InitializeCOMRAII::~InitializeCOMRAII() {}
+}
+}
diff --git a/contrib/libs/llvm12/lib/Support/Unix/DynamicLibrary.inc b/contrib/libs/llvm12/lib/Support/Unix/DynamicLibrary.inc
new file mode 100644
index 00000000000..a2a379963de
--- /dev/null
+++ b/contrib/libs/llvm12/lib/Support/Unix/DynamicLibrary.inc
@@ -0,0 +1,134 @@
+//===- Unix/DynamicLibrary.cpp - Unix DL Implementation ---------*- C++ -*-===//
+//
+// 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 provides the UNIX specific implementation of DynamicLibrary.
+//
+//===----------------------------------------------------------------------===//
+
+#if defined(HAVE_DLFCN_H) && defined(HAVE_DLOPEN)
+#include <dlfcn.h>
+
+DynamicLibrary::HandleSet::~HandleSet() {
+  // Close the libraries in reverse order.
+  for (void *Handle : llvm::reverse(Handles))
+    ::dlclose(Handle);
+  if (Process)
+    ::dlclose(Process);
+
+  // llvm_shutdown called, Return to default
+  DynamicLibrary::SearchOrder = DynamicLibrary::SO_Linker;
+}
+
+void *DynamicLibrary::HandleSet::DLOpen(const char *File, std::string *Err) {
+  void *Handle = ::dlopen(File, RTLD_LAZY|RTLD_GLOBAL);
+  if (!Handle) {
+    if (Err) *Err = ::dlerror();
+    return &DynamicLibrary::Invalid;
+  }
+
+#ifdef __CYGWIN__
+  // Cygwin searches symbols only in the main
+  // with the handle of dlopen(NULL, RTLD_GLOBAL).
+  if (!File)
+    Handle = RTLD_DEFAULT;
+#endif
+
+  return Handle;
+}
+
+void DynamicLibrary::HandleSet::DLClose(void *Handle) {
+  ::dlclose(Handle);
+}
+
+void *DynamicLibrary::HandleSet::DLSym(void *Handle, const char *Symbol) {
+  return ::dlsym(Handle, Symbol);
+}
+
+#else // !HAVE_DLOPEN
+
+DynamicLibrary::HandleSet::~HandleSet() {}
+
+void *DynamicLibrary::HandleSet::DLOpen(const char *File, std::string *Err) {
+  if (Err) *Err = "dlopen() not supported on this platform";
+  return &Invalid;
+}
+
+void DynamicLibrary::HandleSet::DLClose(void *Handle) {
+}
+
+void *DynamicLibrary::HandleSet::DLSym(void *Handle, const char *Symbol) {
+  return nullptr;
+}
+
+#endif
+
+// Must declare the symbols in the global namespace.
+static void *DoSearch(const char* SymbolName) {
+#define EXPLICIT_SYMBOL(SYM) \
+   extern void *SYM; if (!strcmp(SymbolName, #SYM)) return (void*)&SYM
+
+  // If this is darwin, it has some funky issues, try to solve them here.  Some
+  // important symbols are marked 'private external' which doesn't allow
+  // SearchForAddressOfSymbol to find them.  As such, we special case them here,
+  // there is only a small handful of them.
+
+#ifdef __APPLE__
+  {
+    // __eprintf is sometimes used for assert() handling on x86.
+    //
+    // FIXME: Currently disabled when using Clang, as we don't always have our
+    // runtime support libraries available.
+#ifndef __clang__
+#ifdef __i386__
+    EXPLICIT_SYMBOL(__eprintf);
+#endif
+#endif
+  }
+#endif
+
+#ifdef __CYGWIN__
+  {
+    EXPLICIT_SYMBOL(_alloca);
+    EXPLICIT_SYMBOL(__main);
+  }
+#endif
+
+#undef EXPLICIT_SYMBOL
+
+// This macro returns the address of a well-known, explicit symbol
+#define EXPLICIT_SYMBOL(SYM) \
+   if (!strcmp(SymbolName, #SYM)) return &SYM
+
+// Under glibc we have a weird situation. The stderr/out/in symbols are both
+// macros and global variables because of standards requirements. So, we
+// boldly use the EXPLICIT_SYMBOL macro without checking for a #define first.
+#if defined(__GLIBC__)
+  {
+    EXPLICIT_SYMBOL(stderr);
+    EXPLICIT_SYMBOL(stdout);
+    EXPLICIT_SYMBOL(stdin);
+  }
+#else
+  // For everything else, we want to check to make sure the symbol isn't defined
+  // as a macro before using EXPLICIT_SYMBOL.
+  {
+#ifndef stdin
+    EXPLICIT_SYMBOL(stdin);
+#endif
+#ifndef stdout
+    EXPLICIT_SYMBOL(stdout);
+#endif
+#ifndef stderr
+    EXPLICIT_SYMBOL(stderr);
+#endif
+  }
+#endif
+#undef EXPLICIT_SYMBOL
+
+  return nullptr;
+}
diff --git a/contrib/libs/llvm12/lib/Support/Unix/Host.inc b/contrib/libs/llvm12/lib/Support/Unix/Host.inc
new file mode 100644
index 00000000000..dfcfdd0dee6
--- /dev/null
+++ b/contrib/libs/llvm12/lib/Support/Unix/Host.inc
@@ -0,0 +1,84 @@
+//===- llvm/Support/Unix/Host.inc -------------------------------*- C++ -*-===//
+//
+// 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 implements the UNIX Host support.
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only generic UNIX code that
+//===          is guaranteed to work on *all* UNIX variants.
+//===----------------------------------------------------------------------===//
+
+#include "Unix.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Config/config.h"
+#include <cctype>
+#include <string>
+#include <sys/utsname.h>
+
+using namespace llvm;
+
+static std::string getOSVersion() {
+  struct utsname info;
+
+  if (uname(&info))
+    return "";
+
+  return info.release;
+}
+
+static std::string updateTripleOSVersion(std::string TargetTripleString) {
+  // On darwin, we want to update the version to match that of the target.
+  std::string::size_type DarwinDashIdx = TargetTripleString.find("-darwin");
+  if (DarwinDashIdx != std::string::npos) {
+    TargetTripleString.resize(DarwinDashIdx + strlen("-darwin"));
+    TargetTripleString += getOSVersion();
+    return TargetTripleString;
+  }
+  std::string::size_type MacOSDashIdx = TargetTripleString.find("-macos");
+  if (MacOSDashIdx != std::string::npos) {
+    TargetTripleString.resize(MacOSDashIdx);
+    // Reset the OS to darwin as the OS version from `uname` doesn't use the
+    // macOS version scheme.
+    TargetTripleString += "-darwin";
+    TargetTripleString += getOSVersion();
+  }
+  // On AIX, the AIX version and release should be that of the current host
+  // unless if the version has already been specified.
+  if (Triple(LLVM_HOST_TRIPLE).getOS() == Triple::AIX) {
+    Triple TT(TargetTripleString);
+    if (TT.getOS() == Triple::AIX && !TT.getOSMajorVersion()) {
+      struct utsname name;
+      if (uname(&name) != -1) {
+        std::string NewOSName = std::string(Triple::getOSTypeName(Triple::AIX));
+        NewOSName += name.version;
+        NewOSName += '.';
+        NewOSName += name.release;
+        NewOSName += ".0.0";
+        TT.setOSName(NewOSName);
+        return TT.str();
+      }
+    }
+  }
+  return TargetTripleString;
+}
+
+std::string sys::getDefaultTargetTriple() {
+  std::string TargetTripleString =
+      updateTripleOSVersion(LLVM_DEFAULT_TARGET_TRIPLE);
+
+  // Override the default target with an environment variable named by
+  // LLVM_TARGET_TRIPLE_ENV.
+#if defined(LLVM_TARGET_TRIPLE_ENV)
+  if (const char *EnvTriple = std::getenv(LLVM_TARGET_TRIPLE_ENV))
+    TargetTripleString = EnvTriple;
+#endif
+
+  return TargetTripleString;
+}
diff --git a/contrib/libs/llvm12/lib/Support/Unix/Memory.inc b/contrib/libs/llvm12/lib/Support/Unix/Memory.inc
new file mode 100644
index 00000000000..be88e7db140
--- /dev/null
+++ b/contrib/libs/llvm12/lib/Support/Unix/Memory.inc
@@ -0,0 +1,265 @@
+//===- Unix/Memory.cpp - Generic UNIX System Configuration ------*- C++ -*-===//
+//
+// 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 defines some functions for various memory management utilities.
+//
+//===----------------------------------------------------------------------===//
+
+#include "Unix.h"
+#include "llvm/Config/config.h"
+#include "llvm/Support/Alignment.h"
+#include "llvm/Support/DataTypes.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/Process.h"
+
+#ifdef HAVE_SYS_MMAN_H
+#include <sys/mman.h>
+#endif
+
+#ifdef __APPLE__
+#include <mach/mach.h>
+#endif
+
+#ifdef __Fuchsia__
+#include <zircon/syscalls.h>
+#endif
+
+#if defined(__mips__)
+#  if defined(__OpenBSD__)
+#    include <mips64/sysarch.h>
+#  elif !defined(__FreeBSD__)
+#    include <sys/cachectl.h>
+#  endif
+#endif
+
+#if defined(__APPLE__)
+extern "C" void sys_icache_invalidate(const void *Addr, size_t len);
+#else
+extern "C" void __clear_cache(void *, void*);
+#endif
+
+static int getPosixProtectionFlags(unsigned Flags) {
+  switch (Flags & llvm::sys::Memory::MF_RWE_MASK) {
+  case llvm::sys::Memory::MF_READ:
+    return PROT_READ;
+  case llvm::sys::Memory::MF_WRITE:
+    return PROT_WRITE;
+  case llvm::sys::Memory::MF_READ|llvm::sys::Memory::MF_WRITE:
+    return PROT_READ | PROT_WRITE;
+  case llvm::sys::Memory::MF_READ|llvm::sys::Memory::MF_EXEC:
+    return PROT_READ | PROT_EXEC;
+  case llvm::sys::Memory::MF_READ | llvm::sys::Memory::MF_WRITE |
+      llvm::sys::Memory::MF_EXEC:
+    return PROT_READ | PROT_WRITE | PROT_EXEC;
+  case llvm::sys::Memory::MF_EXEC:
+#if (defined(__FreeBSD__) || defined(__POWERPC__) || defined (__ppc__) || \
+     defined(_POWER) || defined(_ARCH_PPC))
+    // On PowerPC, having an executable page that has no read permission
+    // can have unintended consequences.  The function InvalidateInstruction-
+    // Cache uses instructions dcbf and icbi, both of which are treated by
+    // the processor as loads.  If the page has no read permissions,
+    // executing these instructions will result in a segmentation fault.
+    return PROT_READ | PROT_EXEC;
+#else
+    return PROT_EXEC;
+#endif
+  default:
+    llvm_unreachable("Illegal memory protection flag specified!");
+  }
+  // Provide a default return value as required by some compilers.
+  return PROT_NONE;
+}
+
+namespace llvm {
+namespace sys {
+
+MemoryBlock
+Memory::allocateMappedMemory(size_t NumBytes,
+                             const MemoryBlock *const NearBlock,
+                             unsigned PFlags,
+                             std::error_code &EC) {
+  EC = std::error_code();
+  if (NumBytes == 0)
+    return MemoryBlock();
+
+  // On platforms that have it, we can use MAP_ANON to get a memory-mapped
+  // page without file backing, but we need a fallback of opening /dev/zero
+  // for strictly POSIX platforms instead.
+  int fd;
+#if defined(MAP_ANON)
+  fd = -1;
+#else
+  fd = open("/dev/zero", O_RDWR);
+  if (fd == -1) {
+    EC = std::error_code(errno, std::generic_category());
+    return MemoryBlock();
+  }
+#endif
+
+  int MMFlags = MAP_PRIVATE;
+#if defined(MAP_ANON)
+  MMFlags |= MAP_ANON;
+#endif
+  int Protect = getPosixProtectionFlags(PFlags);
+
+#if defined(__NetBSD__) && defined(PROT_MPROTECT)
+  Protect |= PROT_MPROTECT(PROT_READ | PROT_WRITE | PROT_EXEC);
+#endif
+
+  // Use any near hint and the page size to set a page-aligned starting address
+  uintptr_t Start = NearBlock ? reinterpret_cast<uintptr_t>(NearBlock->base()) +
+                                      NearBlock->allocatedSize() : 0;
+  static const size_t PageSize = Process::getPageSizeEstimate();
+  const size_t NumPages = (NumBytes+PageSize-1)/PageSize;
+
+  if (Start && Start % PageSize)
+    Start += PageSize - Start % PageSize;
+
+  // FIXME: Handle huge page requests (MF_HUGE_HINT).
+  void *Addr = ::mmap(reinterpret_cast<void *>(Start), PageSize*NumPages, Protect,
+                      MMFlags, fd, 0);
+  if (Addr == MAP_FAILED) {
+    if (NearBlock) { //Try again without a near hint
+#if !defined(MAP_ANON)
+      close(fd);
+#endif
+      return allocateMappedMemory(NumBytes, nullptr, PFlags, EC);
+    }
+
+    EC = std::error_code(errno, std::generic_category());
+#if !defined(MAP_ANON)
+    close(fd);
+#endif
+    return MemoryBlock();
+  }
+
+#if !defined(MAP_ANON)
+  close(fd);
+#endif
+
+  MemoryBlock Result;
+  Result.Address = Addr;
+  Result.AllocatedSize = PageSize*NumPages;
+  Result.Flags = PFlags;
+
+  // Rely on protectMappedMemory to invalidate instruction cache.
+  if (PFlags & MF_EXEC) {
+    EC = Memory::protectMappedMemory (Result, PFlags);
+    if (EC != std::error_code())
+      return MemoryBlock();
+  }
+
+  return Result;
+}
+
+std::error_code
+Memory::releaseMappedMemory(MemoryBlock &M) {
+  if (M.Address == nullptr || M.AllocatedSize == 0)
+    return std::error_code();
+
+  if (0 != ::munmap(M.Address, M.AllocatedSize))
+    return std::error_code(errno, std::generic_category());
+
+  M.Address = nullptr;
+  M.AllocatedSize = 0;
+
+  return std::error_code();
+}
+
+std::error_code
+Memory::protectMappedMemory(const MemoryBlock &M, unsigned Flags) {
+  static const Align PageSize = Align(Process::getPageSizeEstimate());
+  if (M.Address == nullptr || M.AllocatedSize == 0)
+    return std::error_code();
+
+  if (!Flags)
+    return std::error_code(EINVAL, std::generic_category());
+
+  int Protect = getPosixProtectionFlags(Flags);
+  uintptr_t Start = alignAddr((const uint8_t *)M.Address - PageSize.value() + 1, PageSize);
+  uintptr_t End = alignAddr((const uint8_t *)M.Address + M.AllocatedSize, PageSize);
+
+  bool InvalidateCache = (Flags & MF_EXEC);
+
+#if defined(__arm__) || defined(__aarch64__)
+  // Certain ARM implementations treat icache clear instruction as a memory read,
+  // and CPU segfaults on trying to clear cache on !PROT_READ page.  Therefore we need
+  // to temporarily add PROT_READ for the sake of flushing the instruction caches.
+  if (InvalidateCache && !(Protect & PROT_READ)) {
+    int Result = ::mprotect((void *)Start, End - Start, Protect | PROT_READ);
+    if (Result != 0)
+      return std::error_code(errno, std::generic_category());
+
+    Memory::InvalidateInstructionCache(M.Address, M.AllocatedSize);
+    InvalidateCache = false;
+  }
+#endif
+
+  int Result = ::mprotect((void *)Start, End - Start, Protect);
+
+  if (Result != 0)
+    return std::error_code(errno, std::generic_category());
+
+  if (InvalidateCache)
+    Memory::InvalidateInstructionCache(M.Address, M.AllocatedSize);
+
+  return std::error_code();
+}
+
+/// InvalidateInstructionCache - Before the JIT can run a block of code
+/// that has been emitted it must invalidate the instruction cache on some
+/// platforms.
+void Memory::InvalidateInstructionCache(const void *Addr,
+                                        size_t Len) {
+
+// icache invalidation for PPC and ARM.
+#if defined(__APPLE__)
+
+#  if (defined(__POWERPC__) || defined (__ppc__) || \
+       defined(_POWER) || defined(_ARCH_PPC) || defined(__arm__) || \
+       defined(__arm64__))
+  sys_icache_invalidate(const_cast<void *>(Addr), Len);
+#  endif
+
+#elif defined(__Fuchsia__)
+
+  zx_status_t Status = zx_cache_flush(Addr, Len, ZX_CACHE_FLUSH_INSN);
+  assert(Status == ZX_OK && "cannot invalidate instruction cache");
+
+#else
+
+#  if (defined(__POWERPC__) || defined (__ppc__) || \
+       defined(_POWER) || defined(_ARCH_PPC)) && defined(__GNUC__)
+  const size_t LineSize = 32;
+
+  const intptr_t Mask = ~(LineSize - 1);
+  const intptr_t StartLine = ((intptr_t) Addr) & Mask;
+  const intptr_t EndLine = ((intptr_t) Addr + Len + LineSize - 1) & Mask;
+
+  for (intptr_t Line = StartLine; Line < EndLine; Line += LineSize)
+    asm volatile("dcbf 0, %0" : : "r"(Line));
+  asm volatile("sync");
+
+  for (intptr_t Line = StartLine; Line < EndLine; Line += LineSize)
+    asm volatile("icbi 0, %0" : : "r"(Line));
+  asm volatile("isync");
+#  elif (defined(__arm__) || defined(__aarch64__) || defined(__mips__)) && \
+        defined(__GNUC__)
+  // FIXME: Can we safely always call this for __GNUC__ everywhere?
+  const char *Start = static_cast<const char *>(Addr);
+  const char *End = Start + Len;
+  __clear_cache(const_cast<char *>(Start), const_cast<char *>(End));
+#  endif
+
+#endif  // end apple
+
+  ValgrindDiscardTranslations(Addr, Len);
+}
+
+} // namespace sys
+} // namespace llvm
diff --git a/contrib/libs/llvm12/lib/Support/Unix/Path.inc b/contrib/libs/llvm12/lib/Support/Unix/Path.inc
new file mode 100644
index 00000000000..996b8aebf61
--- /dev/null
+++ b/contrib/libs/llvm12/lib/Support/Unix/Path.inc
@@ -0,0 +1,1379 @@
+//===- llvm/Support/Unix/Path.inc - Unix Path Implementation ----*- C++ -*-===//
+//
+// 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 implements the Unix specific implementation of the Path API.
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only generic UNIX code that
+//===          is guaranteed to work on *all* UNIX variants.
+//===----------------------------------------------------------------------===//
+
+#include "Unix.h"
+#include <limits.h>
+#include <stdio.h>
+#if HAVE_SYS_STAT_H
+#include <sys/stat.h>
+#endif
+#if HAVE_FCNTL_H
+#include <fcntl.h>
+#endif
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#ifdef HAVE_SYS_MMAN_H
+#include <sys/mman.h>
+#endif
+
+#include <dirent.h>
+#include <pwd.h>
+#include <sys/file.h>
+
+#ifdef __APPLE__
+#include <mach-o/dyld.h>
+#include <sys/attr.h>
+#include <copyfile.h>
+#elif defined(__FreeBSD__)
+#include <osreldate.h>
+#if __FreeBSD_version >= 1300057
+#include <sys/auxv.h>
+#else
+#error #include <machine/elf.h>
+extern char **environ;
+#endif
+#elif defined(__DragonFly__)
+#include <sys/mount.h>
+#elif defined(__MVS__)
+#error #include <sys/ps.h>
+#endif
+
+// Both stdio.h and cstdio are included via different paths and
+// stdcxx's cstdio doesn't include stdio.h, so it doesn't #undef the macros
+// either.
+#undef ferror
+#undef feof
+
+#if !defined(PATH_MAX)
+// For GNU Hurd
+#if defined(__GNU__)
+#define PATH_MAX 4096
+#elif defined(__MVS__)
+#define PATH_MAX _XOPEN_PATH_MAX
+#endif
+#endif
+
+#include <sys/types.h>
+#if !defined(__APPLE__) && !defined(__OpenBSD__) && !defined(__FreeBSD__) &&   \
+    !defined(__linux__) && !defined(__FreeBSD_kernel__) && !defined(_AIX)
+#include <sys/statvfs.h>
+#define STATVFS statvfs
+#define FSTATVFS fstatvfs
+#define STATVFS_F_FRSIZE(vfs) vfs.f_frsize
+#else
+#if defined(__OpenBSD__) || defined(__FreeBSD__)
+#include <sys/mount.h>
+#include <sys/param.h>
+#elif defined(__linux__)
+#if defined(HAVE_LINUX_MAGIC_H)
+#include <linux/magic.h>
+#else
+#if defined(HAVE_LINUX_NFS_FS_H)
+#include <linux/nfs_fs.h>
+#endif
+#if defined(HAVE_LINUX_SMB_H)
+#include <linux/smb.h>
+#endif
+#endif
+#include <sys/vfs.h>
+#elif defined(_AIX)
+#include <sys/statfs.h>
+
+// <sys/vmount.h> depends on `uint` to be a typedef from <sys/types.h> to
+// `uint_t`; however, <sys/types.h> does not always declare `uint`. We provide
+// the typedef prior to including <sys/vmount.h> to work around this issue.
+typedef uint_t uint;
+#include <sys/vmount.h>
+#else
+#include <sys/mount.h>
+#endif
+#define STATVFS statfs
+#define FSTATVFS fstatfs
+#define STATVFS_F_FRSIZE(vfs) static_cast<uint64_t>(vfs.f_bsize)
+#endif
+
+#if defined(__NetBSD__) || defined(__DragonFly__) || defined(__GNU__) || \
+    defined(__MVS__)
+#define STATVFS_F_FLAG(vfs) (vfs).f_flag
+#else
+#define STATVFS_F_FLAG(vfs) (vfs).f_flags
+#endif
+
+using namespace llvm;
+
+namespace llvm {
+namespace sys  {
+namespace fs {
+
+const file_t kInvalidFile = -1;
+
+#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) ||     \
+    defined(__minix) || defined(__FreeBSD_kernel__) || defined(__linux__) ||   \
+    defined(__CYGWIN__) || defined(__DragonFly__) || defined(_AIX) || defined(__GNU__)
+static int
+test_dir(char ret[PATH_MAX], const char *dir, const char *bin)
+{
+  struct stat sb;
+  char fullpath[PATH_MAX];
+
+  int chars = snprintf(fullpath, PATH_MAX, "%s/%s", dir, bin);
+  // We cannot write PATH_MAX characters because the string will be terminated
+  // with a null character. Fail if truncation happened.
+  if (chars >= PATH_MAX)
+    return 1;
+  if (!realpath(fullpath, ret))
+    return 1;
+  if (stat(fullpath, &sb) != 0)
+    return 1;
+
+  return 0;
+}
+
+static char *
+getprogpath(char ret[PATH_MAX], const char *bin)
+{
+  if (bin == nullptr)
+    return nullptr;
+
+  /* First approach: absolute path. */
+  if (bin[0] == '/') {
+    if (test_dir(ret, "/", bin) == 0)
+      return ret;
+    return nullptr;
+  }
+
+  /* Second approach: relative path. */
+  if (strchr(bin, '/')) {
+    char cwd[PATH_MAX];
+    if (!getcwd(cwd, PATH_MAX))
+      return nullptr;
+    if (test_dir(ret, cwd, bin) == 0)
+      return ret;
+    return nullptr;
+  }
+
+  /* Third approach: $PATH */
+  char *pv;
+  if ((pv = getenv("PATH")) == nullptr)
+    return nullptr;
+  char *s = strdup(pv);
+  if (!s)
+    return nullptr;
+  char *state;
+  for (char *t = strtok_r(s, ":", &state); t != nullptr;
+       t = strtok_r(nullptr, ":", &state)) {
+    if (test_dir(ret, t, bin) == 0) {
+      free(s);
+      return ret;
+    }
+  }
+  free(s);
+  return nullptr;
+}
+#endif // __FreeBSD__ || __NetBSD__ || __FreeBSD_kernel__
+
+/// GetMainExecutable - Return the path to the main executable, given the
+/// value of argv[0] from program startup.
+std::string getMainExecutable(const char *argv0, void *MainAddr) {
+#if defined(__APPLE__)
+  // On OS X the executable path is saved to the stack by dyld. Reading it
+  // from there is much faster than calling dladdr, especially for large
+  // binaries with symbols.
+  char exe_path[PATH_MAX];
+  uint32_t size = sizeof(exe_path);
+  if (_NSGetExecutablePath(exe_path, &size) == 0) {
+    char link_path[PATH_MAX];
+    if (realpath(exe_path, link_path))
+      return link_path;
+  }
+#elif defined(__FreeBSD__)
+  // On FreeBSD if the exec path specified in ELF auxiliary vectors is
+  // preferred, if available.  /proc/curproc/file and the KERN_PROC_PATHNAME
+  // sysctl may not return the desired path if there are multiple hardlinks
+  // to the file.
+  char exe_path[PATH_MAX];
+#if __FreeBSD_version >= 1300057
+  if (elf_aux_info(AT_EXECPATH, exe_path, sizeof(exe_path)) == 0)
+    return exe_path;
+#else
+  // elf_aux_info(AT_EXECPATH, ... is not available in all supported versions,
+  // fall back to finding the ELF auxiliary vectors after the process's
+  // environment.
+  char **p = ::environ;
+  while (*p++ != 0)
+    ;
+  // Iterate through auxiliary vectors for AT_EXECPATH.
+  for (; *(uintptr_t *)p != AT_NULL; p++) {
+    if (*(uintptr_t *)p++ == AT_EXECPATH)
+      return *p;
+  }
+#endif
+  // Fall back to argv[0] if auxiliary vectors are not available.
+  if (getprogpath(exe_path, argv0) != NULL)
+    return exe_path;
+#elif defined(__NetBSD__) || defined(__OpenBSD__) || defined(__minix) ||       \
+    defined(__DragonFly__) || defined(__FreeBSD_kernel__) || defined(_AIX)
+  const char *curproc = "/proc/curproc/file";
+  char exe_path[PATH_MAX];
+  if (sys::fs::exists(curproc)) {
+    ssize_t len = readlink(curproc, exe_path, sizeof(exe_path));
+    if (len > 0) {
+      // Null terminate the string for realpath. readlink never null
+      // terminates its output.
+      len = std::min(len, ssize_t(sizeof(exe_path) - 1));
+      exe_path[len] = '\0';
+      return exe_path;
+    }
+  }
+  // If we don't have procfs mounted, fall back to argv[0]
+  if (getprogpath(exe_path, argv0) != NULL)
+    return exe_path;
+#elif defined(__linux__) || defined(__CYGWIN__) || defined(__gnu_hurd__)
+  char exe_path[PATH_MAX];
+  const char *aPath = "/proc/self/exe";
+  if (sys::fs::exists(aPath)) {
+    // /proc is not always mounted under Linux (chroot for example).
+    ssize_t len = readlink(aPath, exe_path, sizeof(exe_path));
+    if (len < 0)
+      return "";
+
+    // Null terminate the string for realpath. readlink never null
+    // terminates its output.
+    len = std::min(len, ssize_t(sizeof(exe_path) - 1));
+    exe_path[len] = '\0';
+
+    // On Linux, /proc/self/exe always looks through symlinks. However, on
+    // GNU/Hurd, /proc/self/exe is a symlink to the path that was used to start
+    // the program, and not the eventual binary file. Therefore, call realpath
+    // so this behaves the same on all platforms.
+#if _POSIX_VERSION >= 200112 || defined(__GLIBC__)
+    if (char *real_path = realpath(exe_path, NULL)) {
+      std::string ret = std::string(real_path);
+      free(real_path);
+      return ret;
+    }
+#else
+    char real_path[PATH_MAX];
+    if (realpath(exe_path, real_path))
+      return std::string(real_path);
+#endif
+  }
+  // Fall back to the classical detection.
+  if (getprogpath(exe_path, argv0))
+    return exe_path;
+#elif defined(__MVS__)
+  int token = 0;
+  W_PSPROC buf;
+  char exe_path[PS_PATHBLEN];
+  pid_t pid = getpid();
+
+  memset(&buf, 0, sizeof(buf));
+  buf.ps_pathptr = exe_path;
+  buf.ps_pathlen = sizeof(exe_path);
+
+  while (true) {
+    if ((token = w_getpsent(token, &buf, sizeof(buf))) <= 0)
+      break;
+    if (buf.ps_pid != pid)
+      continue;
+    char real_path[PATH_MAX];
+    if (realpath(exe_path, real_path))
+      return std::string(real_path);
+    break;  // Found entry, but realpath failed.
+  }
+#elif defined(HAVE_DLFCN_H) && defined(HAVE_DLADDR)
+  // Use dladdr to get executable path if available.
+  Dl_info DLInfo;
+  int err = dladdr(MainAddr, &DLInfo);
+  if (err == 0)
+    return "";
+
+  // If the filename is a symlink, we need to resolve and return the location of
+  // the actual executable.
+  char link_path[PATH_MAX];
+  if (realpath(DLInfo.dli_fname, link_path))
+    return link_path;
+#else
+#error GetMainExecutable is not implemented on this host yet.
+#endif
+  return "";
+}
+
+TimePoint<> basic_file_status::getLastAccessedTime() const {
+  return toTimePoint(fs_st_atime, fs_st_atime_nsec);
+}
+
+TimePoint<> basic_file_status::getLastModificationTime() const {
+  return toTimePoint(fs_st_mtime, fs_st_mtime_nsec);
+}
+
+UniqueID file_status::getUniqueID() const {
+  return UniqueID(fs_st_dev, fs_st_ino);
+}
+
+uint32_t file_status::getLinkCount() const {
+  return fs_st_nlinks;
+}
+
+ErrorOr<space_info> disk_space(const Twine &Path) {
+  struct STATVFS Vfs;
+  if (::STATVFS(const_cast<char *>(Path.str().c_str()), &Vfs))
+    return std::error_code(errno, std::generic_category());
+  auto FrSize = STATVFS_F_FRSIZE(Vfs);
+  space_info SpaceInfo;
+  SpaceInfo.capacity = static_cast<uint64_t>(Vfs.f_blocks) * FrSize;
+  SpaceInfo.free = static_cast<uint64_t>(Vfs.f_bfree) * FrSize;
+  SpaceInfo.available = static_cast<uint64_t>(Vfs.f_bavail) * FrSize;
+  return SpaceInfo;
+}
+
+std::error_code current_path(SmallVectorImpl<char> &result) {
+  result.clear();
+
+  const char *pwd = ::getenv("PWD");
+  llvm::sys::fs::file_status PWDStatus, DotStatus;
+  if (pwd && llvm::sys::path::is_absolute(pwd) &&
+      !llvm::sys::fs::status(pwd, PWDStatus) &&
+      !llvm::sys::fs::status(".", DotStatus) &&
+      PWDStatus.getUniqueID() == DotStatus.getUniqueID()) {
+    result.append(pwd, pwd + strlen(pwd));
+    return std::error_code();
+  }
+
+  result.reserve(PATH_MAX);
+
+  while (true) {
+    if (::getcwd(result.data(), result.capacity()) == nullptr) {
+      // See if there was a real error.
+      if (errno != ENOMEM)
+        return std::error_code(errno, std::generic_category());
+      // Otherwise there just wasn't enough space.
+      result.reserve(result.capacity() * 2);
+    } else
+      break;
+  }
+
+  result.set_size(strlen(result.data()));
+  return std::error_code();
+}
+
+std::error_code set_current_path(const Twine &path) {
+  SmallString<128> path_storage;
+  StringRef p = path.toNullTerminatedStringRef(path_storage);
+
+  if (::chdir(p.begin()) == -1)
+    return std::error_code(errno, std::generic_category());
+
+  return std::error_code();
+}
+
+std::error_code create_directory(const Twine &path, bool IgnoreExisting,
+                                 perms Perms) {
+  SmallString<128> path_storage;
+  StringRef p = path.toNullTerminatedStringRef(path_storage);
+
+  if (::mkdir(p.begin(), Perms) == -1) {
+    if (errno != EEXIST || !IgnoreExisting)
+      return std::error_code(errno, std::generic_category());
+  }
+
+  return std::error_code();
+}
+
+// Note that we are using symbolic link because hard links are not supported by
+// all filesystems (SMB doesn't).
+std::error_code create_link(const Twine &to, const Twine &from) {
+  // Get arguments.
+  SmallString<128> from_storage;
+  SmallString<128> to_storage;
+  StringRef f = from.toNullTerminatedStringRef(from_storage);
+  StringRef t = to.toNullTerminatedStringRef(to_storage);
+
+  if (::symlink(t.begin(), f.begin()) == -1)
+    return std::error_code(errno, std::generic_category());
+
+  return std::error_code();
+}
+
+std::error_code create_hard_link(const Twine &to, const Twine &from) {
+  // Get arguments.
+  SmallString<128> from_storage;
+  SmallString<128> to_storage;
+  StringRef f = from.toNullTerminatedStringRef(from_storage);
+  StringRef t = to.toNullTerminatedStringRef(to_storage);
+
+  if (::link(t.begin(), f.begin()) == -1)
+    return std::error_code(errno, std::generic_category());
+
+  return std::error_code();
+}
+
+std::error_code remove(const Twine &path, bool IgnoreNonExisting) {
+  SmallString<128> path_storage;
+  StringRef p = path.toNullTerminatedStringRef(path_storage);
+
+  struct stat buf;
+  if (lstat(p.begin(), &buf) != 0) {
+    if (errno != ENOENT || !IgnoreNonExisting)
+      return std::error_code(errno, std::generic_category());
+    return std::error_code();
+  }
+
+  // Note: this check catches strange situations. In all cases, LLVM should
+  // only be involved in the creation and deletion of regular files.  This
+  // check ensures that what we're trying to erase is a regular file. It
+  // effectively prevents LLVM from erasing things like /dev/null, any block
+  // special file, or other things that aren't "regular" files.
+  if (!S_ISREG(buf.st_mode) && !S_ISDIR(buf.st_mode) && !S_ISLNK(buf.st_mode))
+    return make_error_code(errc::operation_not_permitted);
+
+  if (::remove(p.begin()) == -1) {
+    if (errno != ENOENT || !IgnoreNonExisting)
+      return std::error_code(errno, std::generic_category());
+  }
+
+  return std::error_code();
+}
+
+static bool is_local_impl(struct STATVFS &Vfs) {
+#if defined(__linux__) || defined(__GNU__)
+#ifndef NFS_SUPER_MAGIC
+#define NFS_SUPER_MAGIC 0x6969
+#endif
+#ifndef SMB_SUPER_MAGIC
+#define SMB_SUPER_MAGIC 0x517B
+#endif
+#ifndef CIFS_MAGIC_NUMBER
+#define CIFS_MAGIC_NUMBER 0xFF534D42
+#endif
+#ifdef __GNU__
+  switch ((uint32_t)Vfs.__f_type) {
+#else
+  switch ((uint32_t)Vfs.f_type) {
+#endif
+  case NFS_SUPER_MAGIC:
+  case SMB_SUPER_MAGIC:
+  case CIFS_MAGIC_NUMBER:
+    return false;
+  default:
+    return true;
+  }
+#elif defined(__CYGWIN__)
+  // Cygwin doesn't expose this information; would need to use Win32 API.
+  return false;
+#elif defined(__Fuchsia__)
+  // Fuchsia doesn't yet support remote filesystem mounts.
+  return true;
+#elif defined(__EMSCRIPTEN__)
+  // Emscripten doesn't currently support remote filesystem mounts.
+  return true;
+#elif defined(__HAIKU__)
+  // Haiku doesn't expose this information.
+  return false;
+#elif defined(__sun)
+  // statvfs::f_basetype contains a null-terminated FSType name of the mounted target
+  StringRef fstype(Vfs.f_basetype);
+  // NFS is the only non-local fstype??
+  return !fstype.equals("nfs");
+#elif defined(_AIX)
+  // Call mntctl; try more than twice in case of timing issues with a concurrent
+  // mount.
+  int Ret;
+  size_t BufSize = 2048u;
+  std::unique_ptr<char[]> Buf;
+  int Tries = 3;
+  while (Tries--) {
+    Buf = std::make_unique<char[]>(BufSize);
+    Ret = mntctl(MCTL_QUERY, BufSize, Buf.get());
+    if (Ret != 0)
+      break;
+    BufSize = *reinterpret_cast<unsigned int *>(Buf.get());
+    Buf.reset();
+  }
+
+  if (Ret == -1)
+    // There was an error; "remote" is the conservative answer.
+    return false;
+
+  // Look for the correct vmount entry.
+  char *CurObjPtr = Buf.get();
+  while (Ret--) {
+    struct vmount *Vp = reinterpret_cast<struct vmount *>(CurObjPtr);
+    static_assert(sizeof(Vfs.f_fsid) == sizeof(Vp->vmt_fsid),
+                  "fsid length mismatch");
+    if (memcmp(&Vfs.f_fsid, &Vp->vmt_fsid, sizeof Vfs.f_fsid) == 0)
+      return (Vp->vmt_flags & MNT_REMOTE) == 0;
+
+    CurObjPtr += Vp->vmt_length;
+  }
+
+  // vmount entry not found; "remote" is the conservative answer.
+  return false;
+#elif defined(__MVS__)
+  // The file system can have an arbitrary structure on z/OS; must go with the
+  // conservative answer.
+  return false;
+#else
+  return !!(STATVFS_F_FLAG(Vfs) & MNT_LOCAL);
+#endif
+}
+
+std::error_code is_local(const Twine &Path, bool &Result) {
+  struct STATVFS Vfs;
+  if (::STATVFS(const_cast<char *>(Path.str().c_str()), &Vfs))
+    return std::error_code(errno, std::generic_category());
+
+  Result = is_local_impl(Vfs);
+  return std::error_code();
+}
+
+std::error_code is_local(int FD, bool &Result) {
+  struct STATVFS Vfs;
+  if (::FSTATVFS(FD, &Vfs))
+    return std::error_code(errno, std::generic_category());
+
+  Result = is_local_impl(Vfs);
+  return std::error_code();
+}
+
+std::error_code rename(const Twine &from, const Twine &to) {
+  // Get arguments.
+  SmallString<128> from_storage;
+  SmallString<128> to_storage;
+  StringRef f = from.toNullTerminatedStringRef(from_storage);
+  StringRef t = to.toNullTerminatedStringRef(to_storage);
+
+  if (::rename(f.begin(), t.begin()) == -1)
+    return std::error_code(errno, std::generic_category());
+
+  return std::error_code();
+}
+
+std::error_code resize_file(int FD, uint64_t Size) {
+#if defined(HAVE_POSIX_FALLOCATE)
+  // If we have posix_fallocate use it. Unlike ftruncate it always allocates
+  // space, so we get an error if the disk is full.
+  if (int Err = ::posix_fallocate(FD, 0, Size)) {
+#ifdef _AIX
+    constexpr int NotSupportedError = ENOTSUP;
+#else
+    constexpr int NotSupportedError = EOPNOTSUPP;
+#endif
+    if (Err != EINVAL && Err != NotSupportedError)
+      return std::error_code(Err, std::generic_category());
+  }
+#endif
+  // Use ftruncate as a fallback. It may or may not allocate space. At least on
+  // OS X with HFS+ it does.
+  if (::ftruncate(FD, Size) == -1)
+    return std::error_code(errno, std::generic_category());
+
+  return std::error_code();
+}
+
+static int convertAccessMode(AccessMode Mode) {
+  switch (Mode) {
+  case AccessMode::Exist:
+    return F_OK;
+  case AccessMode::Write:
+    return W_OK;
+  case AccessMode::Execute:
+    return R_OK | X_OK; // scripts also need R_OK.
+  }
+  llvm_unreachable("invalid enum");
+}
+
+std::error_code access(const Twine &Path, AccessMode Mode) {
+  SmallString<128> PathStorage;
+  StringRef P = Path.toNullTerminatedStringRef(PathStorage);
+
+  if (::access(P.begin(), convertAccessMode(Mode)) == -1)
+    return std::error_code(errno, std::generic_category());
+
+  if (Mode == AccessMode::Execute) {
+    // Don't say that directories are executable.
+    struct stat buf;
+    if (0 != stat(P.begin(), &buf))
+      return errc::permission_denied;
+    if (!S_ISREG(buf.st_mode))
+      return errc::permission_denied;
+  }
+
+  return std::error_code();
+}
+
+bool can_execute(const Twine &Path) {
+  return !access(Path, AccessMode::Execute);
+}
+
+bool equivalent(file_status A, file_status B) {
+  assert(status_known(A) && status_known(B));
+  return A.fs_st_dev == B.fs_st_dev &&
+         A.fs_st_ino == B.fs_st_ino;
+}
+
+std::error_code equivalent(const Twine &A, const Twine &B, bool &result) {
+  file_status fsA, fsB;
+  if (std::error_code ec = status(A, fsA))
+    return ec;
+  if (std::error_code ec = status(B, fsB))
+    return ec;
+  result = equivalent(fsA, fsB);
+  return std::error_code();
+}
+
+static void expandTildeExpr(SmallVectorImpl<char> &Path) {
+  StringRef PathStr(Path.begin(), Path.size());
+  if (PathStr.empty() || !PathStr.startswith("~"))
+    return;
+
+  PathStr = PathStr.drop_front();
+  StringRef Expr =
+      PathStr.take_until([](char c) { return path::is_separator(c); });
+  StringRef Remainder = PathStr.substr(Expr.size() + 1);
+  SmallString<128> Storage;
+  if (Expr.empty()) {
+    // This is just ~/..., resolve it to the current user's home dir.
+    if (!path::home_directory(Storage)) {
+      // For some reason we couldn't get the home directory.  Just exit.
+      return;
+    }
+
+    // Overwrite the first character and insert the rest.
+    Path[0] = Storage[0];
+    Path.insert(Path.begin() + 1, Storage.begin() + 1, Storage.end());
+    return;
+  }
+
+  // This is a string of the form ~username/, look up this user's entry in the
+  // password database.
+  struct passwd *Entry = nullptr;
+  std::string User = Expr.str();
+  Entry = ::getpwnam(User.c_str());
+
+  if (!Entry) {
+    // Unable to look up the entry, just return back the original path.
+    return;
+  }
+
+  Storage = Remainder;
+  Path.clear();
+  Path.append(Entry->pw_dir, Entry->pw_dir + strlen(Entry->pw_dir));
+  llvm::sys::path::append(Path, Storage);
+}
+
+
+void expand_tilde(const Twine &path, SmallVectorImpl<char> &dest) {
+  dest.clear();
+  if (path.isTriviallyEmpty())
+    return;
+
+  path.toVector(dest);
+  expandTildeExpr(dest);
+}
+
+static file_type typeForMode(mode_t Mode) {
+  if (S_ISDIR(Mode))
+    return file_type::directory_file;
+  else if (S_ISREG(Mode))
+    return file_type::regular_file;
+  else if (S_ISBLK(Mode))
+    return file_type::block_file;
+  else if (S_ISCHR(Mode))
+    return file_type::character_file;
+  else if (S_ISFIFO(Mode))
+    return file_type::fifo_file;
+  else if (S_ISSOCK(Mode))
+    return file_type::socket_file;
+  else if (S_ISLNK(Mode))
+    return file_type::symlink_file;
+  return file_type::type_unknown;
+}
+
+static std::error_code fillStatus(int StatRet, const struct stat &Status,
+                                  file_status &Result) {
+  if (StatRet != 0) {
+    std::error_code EC(errno, std::generic_category());
+    if (EC == errc::no_such_file_or_directory)
+      Result = file_status(file_type::file_not_found);
+    else
+      Result = file_status(file_type::status_error);
+    return EC;
+  }
+
+  uint32_t atime_nsec, mtime_nsec;
+#if defined(HAVE_STRUCT_STAT_ST_MTIMESPEC_TV_NSEC)
+  atime_nsec = Status.st_atimespec.tv_nsec;
+  mtime_nsec = Status.st_mtimespec.tv_nsec;
+#elif defined(HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC)
+  atime_nsec = Status.st_atim.tv_nsec;
+  mtime_nsec = Status.st_mtim.tv_nsec;
+#else
+  atime_nsec = mtime_nsec = 0;
+#endif
+
+  perms Perms = static_cast<perms>(Status.st_mode) & all_perms;
+  Result = file_status(typeForMode(Status.st_mode), Perms, Status.st_dev,
+                       Status.st_nlink, Status.st_ino,
+                       Status.st_atime, atime_nsec, Status.st_mtime, mtime_nsec,
+                       Status.st_uid, Status.st_gid, Status.st_size);
+
+  return std::error_code();
+}
+
+std::error_code status(const Twine &Path, file_status &Result, bool Follow) {
+  SmallString<128> PathStorage;
+  StringRef P = Path.toNullTerminatedStringRef(PathStorage);
+
+  struct stat Status;
+  int StatRet = (Follow ? ::stat : ::lstat)(P.begin(), &Status);
+  return fillStatus(StatRet, Status, Result);
+}
+
+std::error_code status(int FD, file_status &Result) {
+  struct stat Status;
+  int StatRet = ::fstat(FD, &Status);
+  return fillStatus(StatRet, Status, Result);
+}
+
+unsigned getUmask() {
+  // Chose arbitary new mask and reset the umask to the old mask.
+  // umask(2) never fails so ignore the return of the second call.
+  unsigned Mask = ::umask(0);
+  (void) ::umask(Mask);
+  return Mask;
+}
+
+std::error_code setPermissions(const Twine &Path, perms Permissions) {
+  SmallString<128> PathStorage;
+  StringRef P = Path.toNullTerminatedStringRef(PathStorage);
+
+  if (::chmod(P.begin(), Permissions))
+    return std::error_code(errno, std::generic_category());
+  return std::error_code();
+}
+
+std::error_code setPermissions(int FD, perms Permissions) {
+  if (::fchmod(FD, Permissions))
+    return std::error_code(errno, std::generic_category());
+  return std::error_code();
+}
+
+std::error_code setLastAccessAndModificationTime(int FD, TimePoint<> AccessTime,
+                                                 TimePoint<> ModificationTime) {
+#if defined(HAVE_FUTIMENS)
+  timespec Times[2];
+  Times[0] = sys::toTimeSpec(AccessTime);
+  Times[1] = sys::toTimeSpec(ModificationTime);
+  if (::futimens(FD, Times))
+    return std::error_code(errno, std::generic_category());
+  return std::error_code();
+#elif defined(HAVE_FUTIMES)
+  timeval Times[2];
+  Times[0] = sys::toTimeVal(
+      std::chrono::time_point_cast<std::chrono::microseconds>(AccessTime));
+  Times[1] =
+      sys::toTimeVal(std::chrono::time_point_cast<std::chrono::microseconds>(
+          ModificationTime));
+  if (::futimes(FD, Times))
+    return std::error_code(errno, std::generic_category());
+  return std::error_code();
+#elif defined(__MVS__)
+  attrib_t Attr;
+  memset(&Attr, 0, sizeof(Attr));
+  Attr.att_atimechg = 1;
+  Attr.att_atime = sys::toTimeT(AccessTime);
+  Attr.att_mtimechg = 1;
+  Attr.att_mtime = sys::toTimeT(ModificationTime);
+  if (::__fchattr(FD, &Attr, sizeof(Attr)) != 0)
+    return std::error_code(errno, std::generic_category());
+  return std::error_code();
+#else
+#warning Missing futimes() and futimens()
+  return make_error_code(errc::function_not_supported);
+#endif
+}
+
+std::error_code mapped_file_region::init(int FD, uint64_t Offset,
+                                         mapmode Mode) {
+  assert(Size != 0);
+
+  int flags = (Mode == readwrite) ? MAP_SHARED : MAP_PRIVATE;
+  int prot = (Mode == readonly) ? PROT_READ : (PROT_READ | PROT_WRITE);
+#if defined(__APPLE__)
+  //----------------------------------------------------------------------
+  // Newer versions of MacOSX have a flag that will allow us to read from
+  // binaries whose code signature is invalid without crashing by using
+  // the MAP_RESILIENT_CODESIGN flag. Also if a file from removable media
+  // is mapped we can avoid crashing and return zeroes to any pages we try
+  // to read if the media becomes unavailable by using the
+  // MAP_RESILIENT_MEDIA flag.  These flags are only usable when mapping
+  // with PROT_READ, so take care not to specify them otherwise.
+  //----------------------------------------------------------------------
+  if (Mode == readonly) {
+#if defined(MAP_RESILIENT_CODESIGN)
+    flags |= MAP_RESILIENT_CODESIGN;
+#endif
+#if defined(MAP_RESILIENT_MEDIA)
+    flags |= MAP_RESILIENT_MEDIA;
+#endif
+  }
+#endif // #if defined (__APPLE__)
+
+  Mapping = ::mmap(nullptr, Size, prot, flags, FD, Offset);
+  if (Mapping == MAP_FAILED)
+    return std::error_code(errno, std::generic_category());
+  return std::error_code();
+}
+
+mapped_file_region::mapped_file_region(int fd, mapmode mode, size_t length,
+                                       uint64_t offset, std::error_code &ec)
+    : Size(length), Mapping(), Mode(mode) {
+  (void)Mode;
+  ec = init(fd, offset, mode);
+  if (ec)
+    Mapping = nullptr;
+}
+
+mapped_file_region::~mapped_file_region() {
+  if (Mapping)
+    ::munmap(Mapping, Size);
+}
+
+size_t mapped_file_region::size() const {
+  assert(Mapping && "Mapping failed but used anyway!");
+  return Size;
+}
+
+char *mapped_file_region::data() const {
+  assert(Mapping && "Mapping failed but used anyway!");
+  return reinterpret_cast<char*>(Mapping);
+}
+
+const char *mapped_file_region::const_data() const {
+  assert(Mapping && "Mapping failed but used anyway!");
+  return reinterpret_cast<const char*>(Mapping);
+}
+
+int mapped_file_region::alignment() {
+  return Process::getPageSizeEstimate();
+}
+
+std::error_code detail::directory_iterator_construct(detail::DirIterState &it,
+                                                     StringRef path,
+                                                     bool follow_symlinks) {
+  SmallString<128> path_null(path);
+  DIR *directory = ::opendir(path_null.c_str());
+  if (!directory)
+    return std::error_code(errno, std::generic_category());
+
+  it.IterationHandle = reinterpret_cast<intptr_t>(directory);
+  // Add something for replace_filename to replace.
+  path::append(path_null, ".");
+  it.CurrentEntry = directory_entry(path_null.str(), follow_symlinks);
+  return directory_iterator_increment(it);
+}
+
+std::error_code detail::directory_iterator_destruct(detail::DirIterState &it) {
+  if (it.IterationHandle)
+    ::closedir(reinterpret_cast<DIR *>(it.IterationHandle));
+  it.IterationHandle = 0;
+  it.CurrentEntry = directory_entry();
+  return std::error_code();
+}
+
+static file_type direntType(dirent* Entry) {
+  // Most platforms provide the file type in the dirent: Linux/BSD/Mac.
+  // The DTTOIF macro lets us reuse our status -> type conversion.
+  // Note that while glibc provides a macro to see if this is supported,
+  // _DIRENT_HAVE_D_TYPE, it's not defined on BSD/Mac, so we test for the
+  // d_type-to-mode_t conversion macro instead.
+#if defined(DTTOIF)
+  return typeForMode(DTTOIF(Entry->d_type));
+#else
+  // Other platforms such as Solaris require a stat() to get the type.
+  return file_type::type_unknown;
+#endif
+}
+
+std::error_code detail::directory_iterator_increment(detail::DirIterState &It) {
+  errno = 0;
+  dirent *CurDir = ::readdir(reinterpret_cast<DIR *>(It.IterationHandle));
+  if (CurDir == nullptr && errno != 0) {
+    return std::error_code(errno, std::generic_category());
+  } else if (CurDir != nullptr) {
+    StringRef Name(CurDir->d_name);
+    if ((Name.size() == 1 && Name[0] == '.') ||
+        (Name.size() == 2 && Name[0] == '.' && Name[1] == '.'))
+      return directory_iterator_increment(It);
+    It.CurrentEntry.replace_filename(Name, direntType(CurDir));
+  } else
+    return directory_iterator_destruct(It);
+
+  return std::error_code();
+}
+
+ErrorOr<basic_file_status> directory_entry::status() const {
+  file_status s;
+  if (auto EC = fs::status(Path, s, FollowSymlinks))
+    return EC;
+  return s;
+}
+
+#if !defined(F_GETPATH)
+static bool hasProcSelfFD() {
+  // If we have a /proc filesystem mounted, we can quickly establish the
+  // real name of the file with readlink
+  static const bool Result = (::access("/proc/self/fd", R_OK) == 0);
+  return Result;
+}
+#endif
+
+static int nativeOpenFlags(CreationDisposition Disp, OpenFlags Flags,
+                           FileAccess Access) {
+  int Result = 0;
+  if (Access == FA_Read)
+    Result |= O_RDONLY;
+  else if (Access == FA_Write)
+    Result |= O_WRONLY;
+  else if (Access == (FA_Read | FA_Write))
+    Result |= O_RDWR;
+
+  // This is for compatibility with old code that assumed OF_Append implied
+  // would open an existing file.  See Windows/Path.inc for a longer comment.
+  if (Flags & OF_Append)
+    Disp = CD_OpenAlways;
+
+  if (Disp == CD_CreateNew) {
+    Result |= O_CREAT; // Create if it doesn't exist.
+    Result |= O_EXCL;  // Fail if it does.
+  } else if (Disp == CD_CreateAlways) {
+    Result |= O_CREAT; // Create if it doesn't exist.
+    Result |= O_TRUNC; // Truncate if it does.
+  } else if (Disp == CD_OpenAlways) {
+    Result |= O_CREAT; // Create if it doesn't exist.
+  } else if (Disp == CD_OpenExisting) {
+    // Nothing special, just don't add O_CREAT and we get these semantics.
+  }
+
+  if (Flags & OF_Append)
+    Result |= O_APPEND;
+
+#ifdef O_CLOEXEC
+  if (!(Flags & OF_ChildInherit))
+    Result |= O_CLOEXEC;
+#endif
+
+  return Result;
+}
+
+std::error_code openFile(const Twine &Name, int &ResultFD,
+                         CreationDisposition Disp, FileAccess Access,
+                         OpenFlags Flags, unsigned Mode) {
+  int OpenFlags = nativeOpenFlags(Disp, Flags, Access);
+
+  SmallString<128> Storage;
+  StringRef P = Name.toNullTerminatedStringRef(Storage);
+  // Call ::open in a lambda to avoid overload resolution in RetryAfterSignal
+  // when open is overloaded, such as in Bionic.
+  auto Open = [&]() { return ::open(P.begin(), OpenFlags, Mode); };
+  if ((ResultFD = sys::RetryAfterSignal(-1, Open)) < 0)
+    return std::error_code(errno, std::generic_category());
+#ifndef O_CLOEXEC
+  if (!(Flags & OF_ChildInherit)) {
+    int r = fcntl(ResultFD, F_SETFD, FD_CLOEXEC);
+    (void)r;
+    assert(r == 0 && "fcntl(F_SETFD, FD_CLOEXEC) failed");
+  }
+#endif
+  return std::error_code();
+}
+
+Expected<int> openNativeFile(const Twine &Name, CreationDisposition Disp,
+                             FileAccess Access, OpenFlags Flags,
+                             unsigned Mode) {
+
+  int FD;
+  std::error_code EC = openFile(Name, FD, Disp, Access, Flags, Mode);
+  if (EC)
+    return errorCodeToError(EC);
+  return FD;
+}
+
+std::error_code openFileForRead(const Twine &Name, int &ResultFD,
+                                OpenFlags Flags,
+                                SmallVectorImpl<char> *RealPath) {
+  std::error_code EC =
+      openFile(Name, ResultFD, CD_OpenExisting, FA_Read, Flags, 0666);
+  if (EC)
+    return EC;
+
+  // Attempt to get the real name of the file, if the user asked
+  if(!RealPath)
+    return std::error_code();
+  RealPath->clear();
+#if defined(F_GETPATH)
+  // When F_GETPATH is availble, it is the quickest way to get
+  // the real path name.
+  char Buffer[PATH_MAX];
+  if (::fcntl(ResultFD, F_GETPATH, Buffer) != -1)
+    RealPath->append(Buffer, Buffer + strlen(Buffer));
+#else
+  char Buffer[PATH_MAX];
+  if (hasProcSelfFD()) {
+    char ProcPath[64];
+    snprintf(ProcPath, sizeof(ProcPath), "/proc/self/fd/%d", ResultFD);
+    ssize_t CharCount = ::readlink(ProcPath, Buffer, sizeof(Buffer));
+    if (CharCount > 0)
+      RealPath->append(Buffer, Buffer + CharCount);
+  } else {
+    SmallString<128> Storage;
+    StringRef P = Name.toNullTerminatedStringRef(Storage);
+
+    // Use ::realpath to get the real path name
+    if (::realpath(P.begin(), Buffer) != nullptr)
+      RealPath->append(Buffer, Buffer + strlen(Buffer));
+  }
+#endif
+  return std::error_code();
+}
+
+Expected<file_t> openNativeFileForRead(const Twine &Name, OpenFlags Flags,
+                                       SmallVectorImpl<char> *RealPath) {
+  file_t ResultFD;
+  std::error_code EC = openFileForRead(Name, ResultFD, Flags, RealPath);
+  if (EC)
+    return errorCodeToError(EC);
+  return ResultFD;
+}
+
+file_t getStdinHandle() { return 0; }
+file_t getStdoutHandle() { return 1; }
+file_t getStderrHandle() { return 2; }
+
+Expected<size_t> readNativeFile(file_t FD, MutableArrayRef<char> Buf) {
+#if defined(__APPLE__)
+  size_t Size = std::min<size_t>(Buf.size(), INT32_MAX);
+#else
+  size_t Size = Buf.size();
+#endif
+  ssize_t NumRead =
+      sys::RetryAfterSignal(-1, ::read, FD, Buf.data(), Size);
+  if (ssize_t(NumRead) == -1)
+    return errorCodeToError(std::error_code(errno, std::generic_category()));
+  return NumRead;
+}
+
+Expected<size_t> readNativeFileSlice(file_t FD, MutableArrayRef<char> Buf,
+                                     uint64_t Offset) {
+#if defined(__APPLE__)
+  size_t Size = std::min<size_t>(Buf.size(), INT32_MAX);
+#else
+  size_t Size = Buf.size();
+#endif
+#ifdef HAVE_PREAD
+  ssize_t NumRead =
+      sys::RetryAfterSignal(-1, ::pread, FD, Buf.data(), Size, Offset);
+#else
+  if (lseek(FD, Offset, SEEK_SET) == -1)
+    return errorCodeToError(std::error_code(errno, std::generic_category()));
+  ssize_t NumRead =
+      sys::RetryAfterSignal(-1, ::read, FD, Buf.data(), Size);
+#endif
+  if (NumRead == -1)
+    return errorCodeToError(std::error_code(errno, std::generic_category()));
+  return NumRead;
+}
+
+std::error_code tryLockFile(int FD, std::chrono::milliseconds Timeout) {
+  auto Start = std::chrono::steady_clock::now();
+  auto End = Start + Timeout;
+  do {
+    struct flock Lock;
+    memset(&Lock, 0, sizeof(Lock));
+    Lock.l_type = F_WRLCK;
+    Lock.l_whence = SEEK_SET;
+    Lock.l_start = 0;
+    Lock.l_len = 0;
+    if (::fcntl(FD, F_SETLK, &Lock) != -1)
+      return std::error_code();
+    int Error = errno;
+    if (Error != EACCES && Error != EAGAIN)
+      return std::error_code(Error, std::generic_category());
+    usleep(1000);
+  } while (std::chrono::steady_clock::now() < End);
+  return make_error_code(errc::no_lock_available);
+}
+
+std::error_code lockFile(int FD) {
+  struct flock Lock;
+  memset(&Lock, 0, sizeof(Lock));
+  Lock.l_type = F_WRLCK;
+  Lock.l_whence = SEEK_SET;
+  Lock.l_start = 0;
+  Lock.l_len = 0;
+  if (::fcntl(FD, F_SETLKW, &Lock) != -1)
+    return std::error_code();
+  int Error = errno;
+  return std::error_code(Error, std::generic_category());
+}
+
+std::error_code unlockFile(int FD) {
+  struct flock Lock;
+  Lock.l_type = F_UNLCK;
+  Lock.l_whence = SEEK_SET;
+  Lock.l_start = 0;
+  Lock.l_len = 0;
+  if (::fcntl(FD, F_SETLK, &Lock) != -1)
+    return std::error_code();
+  return std::error_code(errno, std::generic_category());
+}
+
+std::error_code closeFile(file_t &F) {
+  file_t TmpF = F;
+  F = kInvalidFile;
+  return Process::SafelyCloseFileDescriptor(TmpF);
+}
+
+template <typename T>
+static std::error_code remove_directories_impl(const T &Entry,
+                                               bool IgnoreErrors) {
+  std::error_code EC;
+  directory_iterator Begin(Entry, EC, false);
+  directory_iterator End;
+  while (Begin != End) {
+    auto &Item = *Begin;
+    ErrorOr<basic_file_status> st = Item.status();
+    if (!st && !IgnoreErrors)
+      return st.getError();
+
+    if (is_directory(*st)) {
+      EC = remove_directories_impl(Item, IgnoreErrors);
+      if (EC && !IgnoreErrors)
+        return EC;
+    }
+
+    EC = fs::remove(Item.path(), true);
+    if (EC && !IgnoreErrors)
+      return EC;
+
+    Begin.increment(EC);
+    if (EC && !IgnoreErrors)
+      return EC;
+  }
+  return std::error_code();
+}
+
+std::error_code remove_directories(const Twine &path, bool IgnoreErrors) {
+  auto EC = remove_directories_impl(path, IgnoreErrors);
+  if (EC && !IgnoreErrors)
+    return EC;
+  EC = fs::remove(path, true);
+  if (EC && !IgnoreErrors)
+    return EC;
+  return std::error_code();
+}
+
+std::error_code real_path(const Twine &path, SmallVectorImpl<char> &dest,
+                          bool expand_tilde) {
+  dest.clear();
+  if (path.isTriviallyEmpty())
+    return std::error_code();
+
+  if (expand_tilde) {
+    SmallString<128> Storage;
+    path.toVector(Storage);
+    expandTildeExpr(Storage);
+    return real_path(Storage, dest, false);
+  }
+
+  SmallString<128> Storage;
+  StringRef P = path.toNullTerminatedStringRef(Storage);
+  char Buffer[PATH_MAX];
+  if (::realpath(P.begin(), Buffer) == nullptr)
+    return std::error_code(errno, std::generic_category());
+  dest.append(Buffer, Buffer + strlen(Buffer));
+  return std::error_code();
+}
+
+} // end namespace fs
+
+namespace path {
+
+bool home_directory(SmallVectorImpl<char> &result) {
+  char *RequestedDir = getenv("HOME");
+  if (!RequestedDir) {
+    struct passwd *pw = getpwuid(getuid());
+    if (pw && pw->pw_dir)
+      RequestedDir = pw->pw_dir;
+  }
+  if (!RequestedDir)
+    return false;
+
+  result.clear();
+  result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
+  return true;
+}
+
+static bool getDarwinConfDir(bool TempDir, SmallVectorImpl<char> &Result) {
+  #if defined(_CS_DARWIN_USER_TEMP_DIR) && defined(_CS_DARWIN_USER_CACHE_DIR)
+  // On Darwin, use DARWIN_USER_TEMP_DIR or DARWIN_USER_CACHE_DIR.
+  // macros defined in <unistd.h> on darwin >= 9
+  int ConfName = TempDir ? _CS_DARWIN_USER_TEMP_DIR
+                         : _CS_DARWIN_USER_CACHE_DIR;
+  size_t ConfLen = confstr(ConfName, nullptr, 0);
+  if (ConfLen > 0) {
+    do {
+      Result.resize(ConfLen);
+      ConfLen = confstr(ConfName, Result.data(), Result.size());
+    } while (ConfLen > 0 && ConfLen != Result.size());
+
+    if (ConfLen > 0) {
+      assert(Result.back() == 0);
+      Result.pop_back();
+      return true;
+    }
+
+    Result.clear();
+  }
+  #endif
+  return false;
+}
+
+bool user_config_directory(SmallVectorImpl<char> &result) {
+#ifdef __APPLE__
+  // Mac: ~/Library/Preferences/
+  if (home_directory(result)) {
+    append(result, "Library", "Preferences");
+    return true;
+  }
+#else
+  // XDG_CONFIG_HOME as defined in the XDG Base Directory Specification:
+  // http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
+  if (const char *RequestedDir = getenv("XDG_CONFIG_HOME")) {
+    result.clear();
+    result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
+    return true;
+  }
+#endif
+  // Fallback: ~/.config
+  if (!home_directory(result)) {
+    return false;
+  }
+  append(result, ".config");
+  return true;
+}
+
+bool cache_directory(SmallVectorImpl<char> &result) {
+#ifdef __APPLE__
+  if (getDarwinConfDir(false/*tempDir*/, result)) {
+    return true;
+  }
+#else
+  // XDG_CACHE_HOME as defined in the XDG Base Directory Specification:
+  // http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
+  if (const char *RequestedDir = getenv("XDG_CACHE_HOME")) {
+    result.clear();
+    result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
+    return true;
+  }
+#endif
+  if (!home_directory(result)) {
+    return false;
+  }
+  append(result, ".cache");
+  return true;
+}
+
+static const char *getEnvTempDir() {
+  // Check whether the temporary directory is specified by an environment
+  // variable.
+  const char *EnvironmentVariables[] = {"TMPDIR", "TMP", "TEMP", "TEMPDIR"};
+  for (const char *Env : EnvironmentVariables) {
+    if (const char *Dir = std::getenv(Env))
+      return Dir;
+  }
+
+  return nullptr;
+}
+
+static const char *getDefaultTempDir(bool ErasedOnReboot) {
+#ifdef P_tmpdir
+  if ((bool)P_tmpdir)
+    return P_tmpdir;
+#endif
+
+  if (ErasedOnReboot)
+    return "/tmp";
+  return "/var/tmp";
+}
+
+void system_temp_directory(bool ErasedOnReboot, SmallVectorImpl<char> &Result) {
+  Result.clear();
+
+  if (ErasedOnReboot) {
+    // There is no env variable for the cache directory.
+    if (const char *RequestedDir = getEnvTempDir()) {
+      Result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
+      return;
+    }
+  }
+
+  if (getDarwinConfDir(ErasedOnReboot, Result))
+    return;
+
+  const char *RequestedDir = getDefaultTempDir(ErasedOnReboot);
+  Result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
+}
+
+} // end namespace path
+
+namespace fs {
+
+#ifdef __APPLE__
+/// This implementation tries to perform an APFS CoW clone of the file,
+/// which can be much faster and uses less space.
+/// Unfortunately fcopyfile(3) does not support COPYFILE_CLONE, so the
+/// file descriptor variant of this function still uses the default
+/// implementation.
+std::error_code copy_file(const Twine &From, const Twine &To) {
+  uint32_t Flag = COPYFILE_DATA;
+#if __has_builtin(__builtin_available) && defined(COPYFILE_CLONE)
+  if (__builtin_available(macos 10.12, *)) {
+    bool IsSymlink;
+    if (std::error_code Error = is_symlink_file(From, IsSymlink))
+      return Error;
+    // COPYFILE_CLONE clones the symlink instead of following it
+    // and returns EEXISTS if the target file already exists.
+    if (!IsSymlink && !exists(To))
+      Flag = COPYFILE_CLONE;
+  }
+#endif
+  int Status =
+      copyfile(From.str().c_str(), To.str().c_str(), /* State */ NULL, Flag);
+
+  if (Status == 0)
+    return std::error_code();
+  return std::error_code(errno, std::generic_category());
+}
+#endif // __APPLE__
+
+} // end namespace fs
+
+} // end namespace sys
+} // end namespace llvm
diff --git a/contrib/libs/llvm12/lib/Support/Unix/Process.inc b/contrib/libs/llvm12/lib/Support/Unix/Process.inc
new file mode 100644
index 00000000000..7425d084da2
--- /dev/null
+++ b/contrib/libs/llvm12/lib/Support/Unix/Process.inc
@@ -0,0 +1,457 @@
+//===- Unix/Process.cpp - Unix Process Implementation --------- -*- C++ -*-===//
+//
+// 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 provides the generic Unix implementation of the Process class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "Unix.h"
+#include "llvm/ADT/Hashing.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Config/config.h"
+#include "llvm/Support/ManagedStatic.h"
+#include <mutex>
+#if HAVE_FCNTL_H
+#include <fcntl.h>
+#endif
+#ifdef HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif
+#ifdef HAVE_SYS_RESOURCE_H
+#include <sys/resource.h>
+#endif
+#ifdef HAVE_SYS_STAT_H
+#include <sys/stat.h>
+#endif
+#if HAVE_SIGNAL_H
+#include <signal.h>
+#endif
+#if defined(HAVE_MALLINFO)
+#include <malloc.h>
+#endif
+#if defined(HAVE_MALLCTL)
+#include <malloc_np.h>
+#endif
+#ifdef HAVE_MALLOC_MALLOC_H
+#include <malloc/malloc.h>
+#endif
+#ifdef HAVE_SYS_IOCTL_H
+#  include <sys/ioctl.h>
+#endif
+#ifdef HAVE_TERMIOS_H
+#  include <termios.h>
+#endif
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only generic UNIX code that
+//===          is guaranteed to work on *all* UNIX variants.
+//===----------------------------------------------------------------------===//
+
+using namespace llvm;
+using namespace sys;
+
+static std::pair<std::chrono::microseconds, std::chrono::microseconds> getRUsageTimes() {
+#if defined(HAVE_GETRUSAGE)
+  struct rusage RU;
+  ::getrusage(RUSAGE_SELF, &RU);
+  return { toDuration(RU.ru_utime), toDuration(RU.ru_stime) };
+#else
+#warning Cannot get usage times on this platform
+  return { std::chrono::microseconds::zero(), std::chrono::microseconds::zero() };
+#endif
+}
+
+Process::Pid Process::getProcessId() {
+  static_assert(sizeof(Pid) >= sizeof(pid_t),
+                "Process::Pid should be big enough to store pid_t");
+  return Pid(::getpid());
+}
+
+// On Cygwin, getpagesize() returns 64k(AllocationGranularity) and
+// offset in mmap(3) should be aligned to the AllocationGranularity.
+Expected<unsigned> Process::getPageSize() {
+#if defined(HAVE_GETPAGESIZE)
+  static const int page_size = ::getpagesize();
+#elif defined(HAVE_SYSCONF)
+  static long page_size = ::sysconf(_SC_PAGE_SIZE);
+#else
+#error Cannot get the page size on this machine
+#endif
+  if (page_size == -1)
+    return errorCodeToError(std::error_code(errno, std::generic_category()));
+
+  return static_cast<unsigned>(page_size);
+}
+
+size_t Process::GetMallocUsage() {
+#if defined(HAVE_MALLINFO)
+  struct mallinfo mi;
+  mi = ::mallinfo();
+  return mi.uordblks;
+#elif defined(HAVE_MALLOC_ZONE_STATISTICS) && defined(HAVE_MALLOC_MALLOC_H)
+  malloc_statistics_t Stats;
+  malloc_zone_statistics(malloc_default_zone(), &Stats);
+  return Stats.size_in_use;   // darwin
+#elif defined(HAVE_MALLCTL)
+  size_t alloc, sz;
+  sz = sizeof(size_t);
+  if (mallctl("stats.allocated", &alloc, &sz, NULL, 0) == 0)
+    return alloc;
+  return 0;
+#elif defined(HAVE_SBRK)
+  // Note this is only an approximation and more closely resembles
+  // the value returned by mallinfo in the arena field.
+  static char *StartOfMemory = reinterpret_cast<char*>(::sbrk(0));
+  char *EndOfMemory = (char*)sbrk(0);
+  if (EndOfMemory != ((char*)-1) && StartOfMemory != ((char*)-1))
+    return EndOfMemory - StartOfMemory;
+  return 0;
+#else
+#warning Cannot get malloc info on this platform
+  return 0;
+#endif
+}
+
+void Process::GetTimeUsage(TimePoint<> &elapsed, std::chrono::nanoseconds &user_time,
+                           std::chrono::nanoseconds &sys_time) {
+  elapsed = std::chrono::system_clock::now();
+  std::tie(user_time, sys_time) = getRUsageTimes();
+}
+
+#if defined(HAVE_MACH_MACH_H) && !defined(__GNU__)
+#include <mach/mach.h>
+#endif
+
+// Some LLVM programs such as bugpoint produce core files as a normal part of
+// their operation. To prevent the disk from filling up, this function
+// does what's necessary to prevent their generation.
+void Process::PreventCoreFiles() {
+#if HAVE_SETRLIMIT
+  struct rlimit rlim;
+  rlim.rlim_cur = rlim.rlim_max = 0;
+  setrlimit(RLIMIT_CORE, &rlim);
+#endif
+
+#if defined(HAVE_MACH_MACH_H) && !defined(__GNU__)
+  // Disable crash reporting on Mac OS X 10.0-10.4
+
+  // get information about the original set of exception ports for the task
+  mach_msg_type_number_t Count = 0;
+  exception_mask_t OriginalMasks[EXC_TYPES_COUNT];
+  exception_port_t OriginalPorts[EXC_TYPES_COUNT];
+  exception_behavior_t OriginalBehaviors[EXC_TYPES_COUNT];
+  thread_state_flavor_t OriginalFlavors[EXC_TYPES_COUNT];
+  kern_return_t err =
+    task_get_exception_ports(mach_task_self(), EXC_MASK_ALL, OriginalMasks,
+                             &Count, OriginalPorts, OriginalBehaviors,
+                             OriginalFlavors);
+  if (err == KERN_SUCCESS) {
+    // replace each with MACH_PORT_NULL.
+    for (unsigned i = 0; i != Count; ++i)
+      task_set_exception_ports(mach_task_self(), OriginalMasks[i],
+                               MACH_PORT_NULL, OriginalBehaviors[i],
+                               OriginalFlavors[i]);
+  }
+
+  // Disable crash reporting on Mac OS X 10.5
+  signal(SIGABRT, _exit);
+  signal(SIGILL,  _exit);
+  signal(SIGFPE,  _exit);
+  signal(SIGSEGV, _exit);
+  signal(SIGBUS,  _exit);
+#endif
+
+  coreFilesPrevented = true;
+}
+
+Optional<std::string> Process::GetEnv(StringRef Name) {
+  std::string NameStr = Name.str();
+  const char *Val = ::getenv(NameStr.c_str());
+  if (!Val)
+    return None;
+  return std::string(Val);
+}
+
+namespace {
+class FDCloser {
+public:
+  FDCloser(int &FD) : FD(FD), KeepOpen(false) {}
+  void keepOpen() { KeepOpen = true; }
+  ~FDCloser() {
+    if (!KeepOpen && FD >= 0)
+      ::close(FD);
+  }
+
+private:
+  FDCloser(const FDCloser &) = delete;
+  void operator=(const FDCloser &) = delete;
+
+  int &FD;
+  bool KeepOpen;
+};
+}
+
+std::error_code Process::FixupStandardFileDescriptors() {
+  int NullFD = -1;
+  FDCloser FDC(NullFD);
+  const int StandardFDs[] = {STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO};
+  for (int StandardFD : StandardFDs) {
+    struct stat st;
+    errno = 0;
+    if (RetryAfterSignal(-1, ::fstat, StandardFD, &st) < 0) {
+      assert(errno && "expected errno to be set if fstat failed!");
+      // fstat should return EBADF if the file descriptor is closed.
+      if (errno != EBADF)
+        return std::error_code(errno, std::generic_category());
+    }
+    // if fstat succeeds, move on to the next FD.
+    if (!errno)
+      continue;
+    assert(errno == EBADF && "expected errno to have EBADF at this point!");
+
+    if (NullFD < 0) {
+      // Call ::open in a lambda to avoid overload resolution in
+      // RetryAfterSignal when open is overloaded, such as in Bionic.
+      auto Open = [&]() { return ::open("/dev/null", O_RDWR); };
+      if ((NullFD = RetryAfterSignal(-1, Open)) < 0)
+        return std::error_code(errno, std::generic_category());
+    }
+
+    if (NullFD == StandardFD)
+      FDC.keepOpen();
+    else if (dup2(NullFD, StandardFD) < 0)
+      return std::error_code(errno, std::generic_category());
+  }
+  return std::error_code();
+}
+
+std::error_code Process::SafelyCloseFileDescriptor(int FD) {
+  // Create a signal set filled with *all* signals.
+  sigset_t FullSet;
+  if (sigfillset(&FullSet) < 0)
+    return std::error_code(errno, std::generic_category());
+  // Atomically swap our current signal mask with a full mask.
+  sigset_t SavedSet;
+#if LLVM_ENABLE_THREADS
+  if (int EC = pthread_sigmask(SIG_SETMASK, &FullSet, &SavedSet))
+    return std::error_code(EC, std::generic_category());
+#else
+  if (sigprocmask(SIG_SETMASK, &FullSet, &SavedSet) < 0)
+    return std::error_code(errno, std::generic_category());
+#endif
+  // Attempt to close the file descriptor.
+  // We need to save the error, if one occurs, because our subsequent call to
+  // pthread_sigmask might tamper with errno.
+  int ErrnoFromClose = 0;
+  if (::close(FD) < 0)
+    ErrnoFromClose = errno;
+  // Restore the signal mask back to what we saved earlier.
+  int EC = 0;
+#if LLVM_ENABLE_THREADS
+  EC = pthread_sigmask(SIG_SETMASK, &SavedSet, nullptr);
+#else
+  if (sigprocmask(SIG_SETMASK, &SavedSet, nullptr) < 0)
+    EC = errno;
+#endif
+  // The error code from close takes precedence over the one from
+  // pthread_sigmask.
+  if (ErrnoFromClose)
+    return std::error_code(ErrnoFromClose, std::generic_category());
+  return std::error_code(EC, std::generic_category());
+}
+
+bool Process::StandardInIsUserInput() {
+  return FileDescriptorIsDisplayed(STDIN_FILENO);
+}
+
+bool Process::StandardOutIsDisplayed() {
+  return FileDescriptorIsDisplayed(STDOUT_FILENO);
+}
+
+bool Process::StandardErrIsDisplayed() {
+  return FileDescriptorIsDisplayed(STDERR_FILENO);
+}
+
+bool Process::FileDescriptorIsDisplayed(int fd) {
+#if HAVE_ISATTY
+  return isatty(fd);
+#else
+  // If we don't have isatty, just return false.
+  return false;
+#endif
+}
+
+static unsigned getColumns() {
+  // If COLUMNS is defined in the environment, wrap to that many columns.
+  if (const char *ColumnsStr = std::getenv("COLUMNS")) {
+    int Columns = std::atoi(ColumnsStr);
+    if (Columns > 0)
+      return Columns;
+  }
+
+  // We used to call ioctl TIOCGWINSZ to determine the width. It is considered
+  // unuseful.
+  return 0;
+}
+
+unsigned Process::StandardOutColumns() {
+  if (!StandardOutIsDisplayed())
+    return 0;
+
+  return getColumns();
+}
+
+unsigned Process::StandardErrColumns() {
+  if (!StandardErrIsDisplayed())
+    return 0;
+
+  return getColumns();
+}
+
+#ifdef LLVM_ENABLE_TERMINFO
+// We manually declare these extern functions because finding the correct
+// headers from various terminfo, curses, or other sources is harder than
+// writing their specs down.
+extern "C" int setupterm(char *term, int filedes, int *errret);
+extern "C" struct term *set_curterm(struct term *termp);
+extern "C" int del_curterm(struct term *termp);
+extern "C" int tigetnum(char *capname);
+#endif
+
+#ifdef LLVM_ENABLE_TERMINFO
+static ManagedStatic<std::mutex> TermColorMutex;
+#endif
+
+static bool terminalHasColors(int fd) {
+#ifdef LLVM_ENABLE_TERMINFO
+  // First, acquire a global lock because these C routines are thread hostile.
+  std::lock_guard<std::mutex> G(*TermColorMutex);
+
+  int errret = 0;
+  if (setupterm(nullptr, fd, &errret) != 0)
+    // Regardless of why, if we can't get terminfo, we shouldn't try to print
+    // colors.
+    return false;
+
+  // Test whether the terminal as set up supports color output. How to do this
+  // isn't entirely obvious. We can use the curses routine 'has_colors' but it
+  // would be nice to avoid a dependency on curses proper when we can make do
+  // with a minimal terminfo parsing library. Also, we don't really care whether
+  // the terminal supports the curses-specific color changing routines, merely
+  // if it will interpret ANSI color escape codes in a reasonable way. Thus, the
+  // strategy here is just to query the baseline colors capability and if it
+  // supports colors at all to assume it will translate the escape codes into
+  // whatever range of colors it does support. We can add more detailed tests
+  // here if users report them as necessary.
+  //
+  // The 'tigetnum' routine returns -2 or -1 on errors, and might return 0 if
+  // the terminfo says that no colors are supported.
+  bool HasColors = tigetnum(const_cast<char *>("colors")) > 0;
+
+  // Now extract the structure allocated by setupterm and free its memory
+  // through a really silly dance.
+  struct term *termp = set_curterm(nullptr);
+  (void)del_curterm(termp); // Drop any errors here.
+
+  // Return true if we found a color capabilities for the current terminal.
+  if (HasColors)
+    return true;
+#else
+  // When the terminfo database is not available, check if the current terminal
+  // is one of terminals that are known to support ANSI color escape codes.
+  if (const char *TermStr = std::getenv("TERM")) {
+    return StringSwitch<bool>(TermStr)
+      .Case("ansi", true)
+      .Case("cygwin", true)
+      .Case("linux", true)
+      .StartsWith("screen", true)
+      .StartsWith("xterm", true)
+      .StartsWith("vt100", true)
+      .StartsWith("rxvt", true)
+      .EndsWith("color", true)
+      .Default(false);
+  }
+#endif
+
+  // Otherwise, be conservative.
+  return false;
+}
+
+bool Process::FileDescriptorHasColors(int fd) {
+  // A file descriptor has colors if it is displayed and the terminal has
+  // colors.
+  return FileDescriptorIsDisplayed(fd) && terminalHasColors(fd);
+}
+
+bool Process::StandardOutHasColors() {
+  return FileDescriptorHasColors(STDOUT_FILENO);
+}
+
+bool Process::StandardErrHasColors() {
+  return FileDescriptorHasColors(STDERR_FILENO);
+}
+
+void Process::UseANSIEscapeCodes(bool /*enable*/) {
+  // No effect.
+}
+
+bool Process::ColorNeedsFlush() {
+  // No, we use ANSI escape sequences.
+  return false;
+}
+
+const char *Process::OutputColor(char code, bool bold, bool bg) {
+  return colorcodes[bg?1:0][bold?1:0][code&7];
+}
+
+const char *Process::OutputBold(bool bg) {
+  return "\033[1m";
+}
+
+const char *Process::OutputReverse() {
+  return "\033[7m";
+}
+
+const char *Process::ResetColor() {
+  return "\033[0m";
+}
+
+#if !HAVE_DECL_ARC4RANDOM
+static unsigned GetRandomNumberSeed() {
+  // Attempt to get the initial seed from /dev/urandom, if possible.
+  int urandomFD = open("/dev/urandom", O_RDONLY);
+
+  if (urandomFD != -1) {
+    unsigned seed;
+    // Don't use a buffered read to avoid reading more data
+    // from /dev/urandom than we need.
+    int count = read(urandomFD, (void *)&seed, sizeof(seed));
+
+    close(urandomFD);
+
+    // Return the seed if the read was successful.
+    if (count == sizeof(seed))
+      return seed;
+  }
+
+  // Otherwise, swizzle the current time and the process ID to form a reasonable
+  // seed.
+  const auto Now = std::chrono::high_resolution_clock::now();
+  return hash_combine(Now.time_since_epoch().count(), ::getpid());
+}
+#endif
+
+unsigned llvm::sys::Process::GetRandomNumber() {
+#if HAVE_DECL_ARC4RANDOM
+  return arc4random();
+#else
+  static int x = (static_cast<void>(::srand(GetRandomNumberSeed())), 0);
+  (void)x;
+  return ::rand();
+#endif
+}
diff --git a/contrib/libs/llvm12/lib/Support/Unix/Program.inc b/contrib/libs/llvm12/lib/Support/Unix/Program.inc
new file mode 100644
index 00000000000..fb56fa4b0d1
--- /dev/null
+++ b/contrib/libs/llvm12/lib/Support/Unix/Program.inc
@@ -0,0 +1,559 @@
+//===- llvm/Support/Unix/Program.cpp -----------------------------*- C++ -*-===//
+//
+// 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 implements the Unix specific portion of the Program class.
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only generic UNIX code that
+//===          is guaranteed to work on *all* UNIX variants.
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/Program.h"
+
+#include "Unix.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/Config/config.h"
+#include "llvm/Support/Compiler.h"
+#include "llvm/Support/Errc.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/StringSaver.h"
+#include "llvm/Support/raw_ostream.h"
+#if HAVE_SYS_STAT_H
+#include <sys/stat.h>
+#endif
+#if HAVE_SYS_RESOURCE_H
+#include <sys/resource.h>
+#endif
+#if HAVE_SIGNAL_H
+#include <signal.h>
+#endif
+#if HAVE_FCNTL_H
+#include <fcntl.h>
+#endif
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#ifdef HAVE_POSIX_SPAWN
+#include <spawn.h>
+
+#if defined(__APPLE__)
+#include <TargetConditionals.h>
+#endif
+
+#if defined(__APPLE__) && !(defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE)
+#define USE_NSGETENVIRON 1
+#else
+#define USE_NSGETENVIRON 0
+#endif
+
+#if !USE_NSGETENVIRON
+  extern char **environ;
+#else
+#include <crt_externs.h> // _NSGetEnviron
+#endif
+#endif
+
+using namespace llvm;
+using namespace sys;
+
+ProcessInfo::ProcessInfo() : Pid(0), ReturnCode(0) {}
+
+ErrorOr<std::string> sys::findProgramByName(StringRef Name,
+                                            ArrayRef<StringRef> Paths) {
+  assert(!Name.empty() && "Must have a name!");
+  // Use the given path verbatim if it contains any slashes; this matches
+  // the behavior of sh(1) and friends.
+  if (Name.find('/') != StringRef::npos) return std::string(Name);
+
+  SmallVector<StringRef, 16> EnvironmentPaths;
+  if (Paths.empty())
+    if (const char *PathEnv = std::getenv("PATH")) {
+      SplitString(PathEnv, EnvironmentPaths, ":");
+      Paths = EnvironmentPaths;
+    }
+
+  for (auto Path : Paths) {
+    if (Path.empty())
+      continue;
+
+    // Check to see if this first directory contains the executable...
+    SmallString<128> FilePath(Path);
+    sys::path::append(FilePath, Name);
+    if (sys::fs::can_execute(FilePath.c_str()))
+      return std::string(FilePath.str());  // Found the executable!
+  }
+  return errc::no_such_file_or_directory;
+}
+
+static bool RedirectIO(Optional<StringRef> Path, int FD, std::string* ErrMsg) {
+  if (!Path) // Noop
+    return false;
+  std::string File;
+  if (Path->empty())
+    // Redirect empty paths to /dev/null
+    File = "/dev/null";
+  else
+    File = std::string(*Path);
+
+  // Open the file
+  int InFD = open(File.c_str(), FD == 0 ? O_RDONLY : O_WRONLY|O_CREAT, 0666);
+  if (InFD == -1) {
+    MakeErrMsg(ErrMsg, "Cannot open file '" + File + "' for "
+              + (FD == 0 ? "input" : "output"));
+    return true;
+  }
+
+  // Install it as the requested FD
+  if (dup2(InFD, FD) == -1) {
+    MakeErrMsg(ErrMsg, "Cannot dup2");
+    close(InFD);
+    return true;
+  }
+  close(InFD);      // Close the original FD
+  return false;
+}
+
+#ifdef HAVE_POSIX_SPAWN
+static bool RedirectIO_PS(const std::string *Path, int FD, std::string *ErrMsg,
+                          posix_spawn_file_actions_t *FileActions) {
+  if (!Path) // Noop
+    return false;
+  const char *File;
+  if (Path->empty())
+    // Redirect empty paths to /dev/null
+    File = "/dev/null";
+  else
+    File = Path->c_str();
+
+  if (int Err = posix_spawn_file_actions_addopen(
+          FileActions, FD, File,
+          FD == 0 ? O_RDONLY : O_WRONLY | O_CREAT, 0666))
+    return MakeErrMsg(ErrMsg, "Cannot posix_spawn_file_actions_addopen", Err);
+  return false;
+}
+#endif
+
+static void TimeOutHandler(int Sig) {
+}
+
+static void SetMemoryLimits(unsigned size) {
+#if HAVE_SYS_RESOURCE_H && HAVE_GETRLIMIT && HAVE_SETRLIMIT
+  struct rlimit r;
+  __typeof__ (r.rlim_cur) limit = (__typeof__ (r.rlim_cur)) (size) * 1048576;
+
+  // Heap size
+  getrlimit (RLIMIT_DATA, &r);
+  r.rlim_cur = limit;
+  setrlimit (RLIMIT_DATA, &r);
+#ifdef RLIMIT_RSS
+  // Resident set size.
+  getrlimit (RLIMIT_RSS, &r);
+  r.rlim_cur = limit;
+  setrlimit (RLIMIT_RSS, &r);
+#endif
+#endif
+}
+
+static std::vector<const char *>
+toNullTerminatedCStringArray(ArrayRef<StringRef> Strings, StringSaver &Saver) {
+  std::vector<const char *> Result;
+  for (StringRef S : Strings)
+    Result.push_back(Saver.save(S).data());
+  Result.push_back(nullptr);
+  return Result;
+}
+
+static bool Execute(ProcessInfo &PI, StringRef Program,
+                    ArrayRef<StringRef> Args, Optional<ArrayRef<StringRef>> Env,
+                    ArrayRef<Optional<StringRef>> Redirects,
+                    unsigned MemoryLimit, std::string *ErrMsg,
+                    BitVector *AffinityMask) {
+  if (!llvm::sys::fs::exists(Program)) {
+    if (ErrMsg)
+      *ErrMsg = std::string("Executable \"") + Program.str() +
+                std::string("\" doesn't exist!");
+    return false;
+  }
+
+  assert(!AffinityMask && "Starting a process with an affinity mask is "
+                          "currently not supported on Unix!");
+
+  BumpPtrAllocator Allocator;
+  StringSaver Saver(Allocator);
+  std::vector<const char *> ArgVector, EnvVector;
+  const char **Argv = nullptr;
+  const char **Envp = nullptr;
+  ArgVector = toNullTerminatedCStringArray(Args, Saver);
+  Argv = ArgVector.data();
+  if (Env) {
+    EnvVector = toNullTerminatedCStringArray(*Env, Saver);
+    Envp = EnvVector.data();
+  }
+
+  // If this OS has posix_spawn and there is no memory limit being implied, use
+  // posix_spawn.  It is more efficient than fork/exec.
+#ifdef HAVE_POSIX_SPAWN
+  if (MemoryLimit == 0) {
+    posix_spawn_file_actions_t FileActionsStore;
+    posix_spawn_file_actions_t *FileActions = nullptr;
+
+    // If we call posix_spawn_file_actions_addopen we have to make sure the
+    // c strings we pass to it stay alive until the call to posix_spawn,
+    // so we copy any StringRefs into this variable.
+    std::string RedirectsStorage[3];
+
+    if (!Redirects.empty()) {
+      assert(Redirects.size() == 3);
+      std::string *RedirectsStr[3] = {nullptr, nullptr, nullptr};
+      for (int I = 0; I < 3; ++I) {
+        if (Redirects[I]) {
+          RedirectsStorage[I] = std::string(*Redirects[I]);
+          RedirectsStr[I] = &RedirectsStorage[I];
+        }
+      }
+
+      FileActions = &FileActionsStore;
+      posix_spawn_file_actions_init(FileActions);
+
+      // Redirect stdin/stdout.
+      if (RedirectIO_PS(RedirectsStr[0], 0, ErrMsg, FileActions) ||
+          RedirectIO_PS(RedirectsStr[1], 1, ErrMsg, FileActions))
+        return false;
+      if (!Redirects[1] || !Redirects[2] || *Redirects[1] != *Redirects[2]) {
+        // Just redirect stderr
+        if (RedirectIO_PS(RedirectsStr[2], 2, ErrMsg, FileActions))
+          return false;
+      } else {
+        // If stdout and stderr should go to the same place, redirect stderr
+        // to the FD already open for stdout.
+        if (int Err = posix_spawn_file_actions_adddup2(FileActions, 1, 2))
+          return !MakeErrMsg(ErrMsg, "Can't redirect stderr to stdout", Err);
+      }
+    }
+
+    if (!Envp)
+#if !USE_NSGETENVIRON
+      Envp = const_cast<const char **>(environ);
+#else
+      // environ is missing in dylibs.
+      Envp = const_cast<const char **>(*_NSGetEnviron());
+#endif
+
+    constexpr int maxRetries = 8;
+    int retries = 0;
+    pid_t PID;
+    int Err;
+    do {
+      PID = 0; // Make Valgrind happy.
+      Err = posix_spawn(&PID, Program.str().c_str(), FileActions,
+                        /*attrp*/ nullptr, const_cast<char **>(Argv),
+                        const_cast<char **>(Envp));
+    } while (Err == EINTR && ++retries < maxRetries);
+
+    if (FileActions)
+      posix_spawn_file_actions_destroy(FileActions);
+
+    if (Err)
+     return !MakeErrMsg(ErrMsg, "posix_spawn failed", Err);
+
+    PI.Pid = PID;
+    PI.Process = PID;
+
+    return true;
+  }
+#endif
+
+  // Create a child process.
+  int child = fork();
+  switch (child) {
+    // An error occurred:  Return to the caller.
+    case -1:
+      MakeErrMsg(ErrMsg, "Couldn't fork");
+      return false;
+
+    // Child process: Execute the program.
+    case 0: {
+      // Redirect file descriptors...
+      if (!Redirects.empty()) {
+        // Redirect stdin
+        if (RedirectIO(Redirects[0], 0, ErrMsg)) { return false; }
+        // Redirect stdout
+        if (RedirectIO(Redirects[1], 1, ErrMsg)) { return false; }
+        if (Redirects[1] && Redirects[2] && *Redirects[1] == *Redirects[2]) {
+          // If stdout and stderr should go to the same place, redirect stderr
+          // to the FD already open for stdout.
+          if (-1 == dup2(1,2)) {
+            MakeErrMsg(ErrMsg, "Can't redirect stderr to stdout");
+            return false;
+          }
+        } else {
+          // Just redirect stderr
+          if (RedirectIO(Redirects[2], 2, ErrMsg)) { return false; }
+        }
+      }
+
+      // Set memory limits
+      if (MemoryLimit!=0) {
+        SetMemoryLimits(MemoryLimit);
+      }
+
+      // Execute!
+      std::string PathStr = std::string(Program);
+      if (Envp != nullptr)
+        execve(PathStr.c_str(), const_cast<char **>(Argv),
+               const_cast<char **>(Envp));
+      else
+        execv(PathStr.c_str(), const_cast<char **>(Argv));
+      // If the execve() failed, we should exit. Follow Unix protocol and
+      // return 127 if the executable was not found, and 126 otherwise.
+      // Use _exit rather than exit so that atexit functions and static
+      // object destructors cloned from the parent process aren't
+      // redundantly run, and so that any data buffered in stdio buffers
+      // cloned from the parent aren't redundantly written out.
+      _exit(errno == ENOENT ? 127 : 126);
+    }
+
+    // Parent process: Break out of the switch to do our processing.
+    default:
+      break;
+  }
+
+  PI.Pid = child;
+  PI.Process = child;
+
+  return true;
+}
+
+namespace llvm {
+namespace sys {
+
+#ifndef _AIX
+using ::wait4;
+#else
+static pid_t (wait4)(pid_t pid, int *status, int options, struct rusage *usage);
+#endif
+
+} // namespace sys
+} // namespace llvm
+
+#ifdef _AIX
+#ifndef _ALL_SOURCE
+extern "C" pid_t (wait4)(pid_t pid, int *status, int options,
+                         struct rusage *usage);
+#endif
+pid_t (llvm::sys::wait4)(pid_t pid, int *status, int options,
+                         struct rusage *usage) {
+  assert(pid > 0 && "Only expecting to handle actual PID values!");
+  assert((options & ~WNOHANG) == 0 && "Expecting WNOHANG at most!");
+  assert(usage && "Expecting usage collection!");
+
+  // AIX wait4 does not work well with WNOHANG.
+  if (!(options & WNOHANG))
+    return ::wait4(pid, status, options, usage);
+
+  // For WNOHANG, we use waitid (which supports WNOWAIT) until the child process
+  // has terminated.
+  siginfo_t WaitIdInfo;
+  WaitIdInfo.si_pid = 0;
+  int WaitIdRetVal =
+      waitid(P_PID, pid, &WaitIdInfo, WNOWAIT | WEXITED | options);
+
+  if (WaitIdRetVal == -1 || WaitIdInfo.si_pid == 0)
+    return WaitIdRetVal;
+
+  assert(WaitIdInfo.si_pid == pid);
+
+  // The child has already terminated, so a blocking wait on it is okay in the
+  // absence of indiscriminate `wait` calls from the current process (which
+  // would cause the call here to fail with ECHILD).
+  return ::wait4(pid, status, options & ~WNOHANG, usage);
+}
+#endif
+
+ProcessInfo llvm::sys::Wait(const ProcessInfo &PI, unsigned SecondsToWait,
+                            bool WaitUntilTerminates, std::string *ErrMsg,
+                            Optional<ProcessStatistics> *ProcStat) {
+  struct sigaction Act, Old;
+  assert(PI.Pid && "invalid pid to wait on, process not started?");
+
+  int WaitPidOptions = 0;
+  pid_t ChildPid = PI.Pid;
+  if (WaitUntilTerminates) {
+    SecondsToWait = 0;
+  } else if (SecondsToWait) {
+    // Install a timeout handler.  The handler itself does nothing, but the
+    // simple fact of having a handler at all causes the wait below to return
+    // with EINTR, unlike if we used SIG_IGN.
+    memset(&Act, 0, sizeof(Act));
+    Act.sa_handler = TimeOutHandler;
+    sigemptyset(&Act.sa_mask);
+    sigaction(SIGALRM, &Act, &Old);
+    // FIXME The alarm signal may be delivered to another thread.
+    alarm(SecondsToWait);
+  } else if (SecondsToWait == 0)
+    WaitPidOptions = WNOHANG;
+
+  // Parent process: Wait for the child process to terminate.
+  int status;
+  ProcessInfo WaitResult;
+  rusage Info;
+  if (ProcStat)
+    ProcStat->reset();
+
+  do {
+    WaitResult.Pid = sys::wait4(ChildPid, &status, WaitPidOptions, &Info);
+  } while (WaitUntilTerminates && WaitResult.Pid == -1 && errno == EINTR);
+
+  if (WaitResult.Pid != PI.Pid) {
+    if (WaitResult.Pid == 0) {
+      // Non-blocking wait.
+      return WaitResult;
+    } else {
+      if (SecondsToWait && errno == EINTR) {
+        // Kill the child.
+        kill(PI.Pid, SIGKILL);
+
+        // Turn off the alarm and restore the signal handler
+        alarm(0);
+        sigaction(SIGALRM, &Old, nullptr);
+
+        // Wait for child to die
+        // FIXME This could grab some other child process out from another
+        // waiting thread and then leave a zombie anyway.
+        if (wait(&status) != ChildPid)
+          MakeErrMsg(ErrMsg, "Child timed out but wouldn't die");
+        else
+          MakeErrMsg(ErrMsg, "Child timed out", 0);
+
+        WaitResult.ReturnCode = -2; // Timeout detected
+        return WaitResult;
+      } else if (errno != EINTR) {
+        MakeErrMsg(ErrMsg, "Error waiting for child process");
+        WaitResult.ReturnCode = -1;
+        return WaitResult;
+      }
+    }
+  }
+
+  // We exited normally without timeout, so turn off the timer.
+  if (SecondsToWait && !WaitUntilTerminates) {
+    alarm(0);
+    sigaction(SIGALRM, &Old, nullptr);
+  }
+
+  if (ProcStat) {
+    std::chrono::microseconds UserT = toDuration(Info.ru_utime);
+    std::chrono::microseconds KernelT = toDuration(Info.ru_stime);
+    uint64_t PeakMemory = static_cast<uint64_t>(Info.ru_maxrss);
+    *ProcStat = ProcessStatistics{UserT + KernelT, UserT, PeakMemory};
+  }
+
+  // Return the proper exit status. Detect error conditions
+  // so we can return -1 for them and set ErrMsg informatively.
+  int result = 0;
+  if (WIFEXITED(status)) {
+    result = WEXITSTATUS(status);
+    WaitResult.ReturnCode = result;
+
+    if (result == 127) {
+      if (ErrMsg)
+        *ErrMsg = llvm::sys::StrError(ENOENT);
+      WaitResult.ReturnCode = -1;
+      return WaitResult;
+    }
+    if (result == 126) {
+      if (ErrMsg)
+        *ErrMsg = "Program could not be executed";
+      WaitResult.ReturnCode = -1;
+      return WaitResult;
+    }
+  } else if (WIFSIGNALED(status)) {
+    if (ErrMsg) {
+      *ErrMsg = strsignal(WTERMSIG(status));
+#ifdef WCOREDUMP
+      if (WCOREDUMP(status))
+        *ErrMsg += " (core dumped)";
+#endif
+    }
+    // Return a special value to indicate that the process received an unhandled
+    // signal during execution as opposed to failing to execute.
+    WaitResult.ReturnCode = -2;
+  }
+  return WaitResult;
+}
+
+std::error_code llvm::sys::ChangeStdinToBinary() {
+  // Do nothing, as Unix doesn't differentiate between text and binary.
+  return std::error_code();
+}
+
+std::error_code llvm::sys::ChangeStdoutToBinary() {
+  // Do nothing, as Unix doesn't differentiate between text and binary.
+  return std::error_code();
+}
+
+std::error_code
+llvm::sys::writeFileWithEncoding(StringRef FileName, StringRef Contents,
+                                 WindowsEncodingMethod Encoding /*unused*/) {
+  std::error_code EC;
+  llvm::raw_fd_ostream OS(FileName, EC, llvm::sys::fs::OpenFlags::OF_Text);
+
+  if (EC)
+    return EC;
+
+  OS << Contents;
+
+  if (OS.has_error())
+    return make_error_code(errc::io_error);
+
+  return EC;
+}
+
+bool llvm::sys::commandLineFitsWithinSystemLimits(StringRef Program,
+                                                  ArrayRef<StringRef> Args) {
+  static long ArgMax = sysconf(_SC_ARG_MAX);
+  // POSIX requires that _POSIX_ARG_MAX is 4096, which is the lowest possible
+  // value for ARG_MAX on a POSIX compliant system.
+  static long ArgMin = _POSIX_ARG_MAX;
+
+  // This the same baseline used by xargs.
+  long EffectiveArgMax = 128 * 1024;
+
+  if (EffectiveArgMax > ArgMax)
+    EffectiveArgMax = ArgMax;
+  else if (EffectiveArgMax < ArgMin)
+    EffectiveArgMax = ArgMin;
+
+  // System says no practical limit.
+  if (ArgMax == -1)
+    return true;
+
+  // Conservatively account for space required by environment variables.
+  long HalfArgMax = EffectiveArgMax / 2;
+
+  size_t ArgLength = Program.size() + 1;
+  for (StringRef Arg : Args) {
+    // Ensure that we do not exceed the MAX_ARG_STRLEN constant on Linux, which
+    // does not have a constant unlike what the man pages would have you
+    // believe. Since this limit is pretty high, perform the check
+    // unconditionally rather than trying to be aggressive and limiting it to
+    // Linux only.
+    if (Arg.size() >= (32 * 4096))
+      return false;
+
+    ArgLength += Arg.size() + 1;
+    if (ArgLength > size_t(HalfArgMax)) {
+      return false;
+    }
+  }
+
+  return true;
+}
diff --git a/contrib/libs/llvm12/lib/Support/Unix/README.txt b/contrib/libs/llvm12/lib/Support/Unix/README.txt
new file mode 100644
index 00000000000..3d547c2990d
--- /dev/null
+++ b/contrib/libs/llvm12/lib/Support/Unix/README.txt
@@ -0,0 +1,16 @@
+llvm/lib/Support/Unix README
+===========================
+
+This directory provides implementations of the lib/System classes that
+are common to two or more variants of UNIX. For example, the directory
+structure underneath this directory could look like this:
+
+Unix           - only code that is truly generic to all UNIX platforms
+  Posix        - code that is specific to Posix variants of UNIX
+  SUS          - code that is specific to the Single Unix Specification
+  SysV         - code that is specific to System V variants of UNIX
+
+As a rule, only those directories actually needing to be created should be
+created. Also, further subdirectories could be created to reflect versions of
+the various standards. For example, under SUS there could be v1, v2, and v3
+subdirectories to reflect the three major versions of SUS.
diff --git a/contrib/libs/llvm12/lib/Support/Unix/Signals.inc b/contrib/libs/llvm12/lib/Support/Unix/Signals.inc
new file mode 100644
index 00000000000..3d7b5d2fe5a
--- /dev/null
+++ b/contrib/libs/llvm12/lib/Support/Unix/Signals.inc
@@ -0,0 +1,659 @@
+//===- Signals.cpp - Generic Unix Signals Implementation -----*- C++ -*-===//
+//
+// 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 defines some helpful functions for dealing with the possibility of
+// Unix signals occurring while your program is running.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is extremely careful to only do signal-safe things while in a
+// signal handler. In particular, memory allocation and acquiring a mutex
+// while in a signal handler should never occur. ManagedStatic isn't usable from
+// a signal handler for 2 reasons:
+//
+//  1. Creating a new one allocates.
+//  2. The signal handler could fire while llvm_shutdown is being processed, in
+//     which case the ManagedStatic is in an unknown state because it could
+//     already have been destroyed, or be in the process of being destroyed.
+//
+// Modifying the behavior of the signal handlers (such as registering new ones)
+// can acquire a mutex, but all this guarantees is that the signal handler
+// behavior is only modified by one thread at a time. A signal handler can still
+// fire while this occurs!
+//
+// Adding work to a signal handler requires lock-freedom (and assume atomics are
+// always lock-free) because the signal handler could fire while new work is
+// being added.
+//
+//===----------------------------------------------------------------------===//
+
+#include "Unix.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/Config/config.h"
+#include "llvm/Demangle/Demangle.h"
+#include "llvm/Support/ExitCodes.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/FileUtilities.h"
+#include "llvm/Support/Format.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/Mutex.h"
+#include "llvm/Support/Program.h"
+#include "llvm/Support/SaveAndRestore.h"
+#include "llvm/Support/raw_ostream.h"
+#include <algorithm>
+#include <string>
+#ifdef HAVE_BACKTRACE
+# include BACKTRACE_HEADER         // For backtrace().
+#endif
+#if HAVE_SIGNAL_H
+#include <signal.h>
+#endif
+#if HAVE_SYS_STAT_H
+#include <sys/stat.h>
+#endif
+#if HAVE_DLFCN_H
+#include <dlfcn.h>
+#endif
+#if HAVE_MACH_MACH_H
+#include <mach/mach.h>
+#endif
+#if HAVE_LINK_H
+#include <link.h>
+#endif
+#ifdef HAVE__UNWIND_BACKTRACE
+// FIXME: We should be able to use <unwind.h> for any target that has an
+// _Unwind_Backtrace function, but on FreeBSD the configure test passes
+// despite the function not existing, and on Android, <unwind.h> conflicts
+// with <link.h>.
+#ifdef __GLIBC__
+#include <unwind.h>
+#else
+#undef HAVE__UNWIND_BACKTRACE
+#endif
+#endif
+
+using namespace llvm;
+
+static RETSIGTYPE SignalHandler(int Sig);  // defined below.
+static RETSIGTYPE InfoSignalHandler(int Sig);  // defined below.
+
+using SignalHandlerFunctionType = void (*)();
+/// The function to call if ctrl-c is pressed.
+static std::atomic<SignalHandlerFunctionType> InterruptFunction =
+    ATOMIC_VAR_INIT(nullptr);
+static std::atomic<SignalHandlerFunctionType> InfoSignalFunction =
+    ATOMIC_VAR_INIT(nullptr);
+/// The function to call on SIGPIPE (one-time use only).
+static std::atomic<SignalHandlerFunctionType> OneShotPipeSignalFunction =
+    ATOMIC_VAR_INIT(nullptr);
+
+namespace {
+/// Signal-safe removal of files.
+/// Inserting and erasing from the list isn't signal-safe, but removal of files
+/// themselves is signal-safe. Memory is freed when the head is freed, deletion
+/// is therefore not signal-safe either.
+class FileToRemoveList {
+  std::atomic<char *> Filename = ATOMIC_VAR_INIT(nullptr);
+  std::atomic<FileToRemoveList *> Next = ATOMIC_VAR_INIT(nullptr);
+
+  FileToRemoveList() = default;
+  // Not signal-safe.
+  FileToRemoveList(const std::string &str) : Filename(strdup(str.c_str())) {}
+
+public:
+  // Not signal-safe.
+  ~FileToRemoveList() {
+    if (FileToRemoveList *N = Next.exchange(nullptr))
+      delete N;
+    if (char *F = Filename.exchange(nullptr))
+      free(F);
+  }
+
+  // Not signal-safe.
+  static void insert(std::atomic<FileToRemoveList *> &Head,
+                     const std::string &Filename) {
+    // Insert the new file at the end of the list.
+    FileToRemoveList *NewHead = new FileToRemoveList(Filename);
+    std::atomic<FileToRemoveList *> *InsertionPoint = &Head;
+    FileToRemoveList *OldHead = nullptr;
+    while (!InsertionPoint->compare_exchange_strong(OldHead, NewHead)) {
+      InsertionPoint = &OldHead->Next;
+      OldHead = nullptr;
+    }
+  }
+
+  // Not signal-safe.
+  static void erase(std::atomic<FileToRemoveList *> &Head,
+                    const std::string &Filename) {
+    // Use a lock to avoid concurrent erase: the comparison would access
+    // free'd memory.
+    static ManagedStatic<sys::SmartMutex<true>> Lock;
+    sys::SmartScopedLock<true> Writer(*Lock);
+
+    for (FileToRemoveList *Current = Head.load(); Current;
+         Current = Current->Next.load()) {
+      if (char *OldFilename = Current->Filename.load()) {
+        if (OldFilename != Filename)
+          continue;
+        // Leave an empty filename.
+        OldFilename = Current->Filename.exchange(nullptr);
+        // The filename might have become null between the time we
+        // compared it and we exchanged it.
+        if (OldFilename)
+          free(OldFilename);
+      }
+    }
+  }
+
+  // Signal-safe.
+  static void removeAllFiles(std::atomic<FileToRemoveList *> &Head) {
+    // If cleanup were to occur while we're removing files we'd have a bad time.
+    // Make sure we're OK by preventing cleanup from doing anything while we're
+    // removing files. If cleanup races with us and we win we'll have a leak,
+    // but we won't crash.
+    FileToRemoveList *OldHead = Head.exchange(nullptr);
+
+    for (FileToRemoveList *currentFile = OldHead; currentFile;
+         currentFile = currentFile->Next.load()) {
+      // If erasing was occuring while we're trying to remove files we'd look
+      // at free'd data. Take away the path and put it back when done.
+      if (char *path = currentFile->Filename.exchange(nullptr)) {
+        // Get the status so we can determine if it's a file or directory. If we
+        // can't stat the file, ignore it.
+        struct stat buf;
+        if (stat(path, &buf) != 0)
+          continue;
+
+        // If this is not a regular file, ignore it. We want to prevent removal
+        // of special files like /dev/null, even if the compiler is being run
+        // with the super-user permissions.
+        if (!S_ISREG(buf.st_mode))
+          continue;
+
+        // Otherwise, remove the file. We ignore any errors here as there is
+        // nothing else we can do.
+        unlink(path);
+
+        // We're done removing the file, erasing can safely proceed.
+        currentFile->Filename.exchange(path);
+      }
+    }
+
+    // We're done removing files, cleanup can safely proceed.
+    Head.exchange(OldHead);
+  }
+};
+static std::atomic<FileToRemoveList *> FilesToRemove = ATOMIC_VAR_INIT(nullptr);
+
+/// Clean up the list in a signal-friendly manner.
+/// Recall that signals can fire during llvm_shutdown. If this occurs we should
+/// either clean something up or nothing at all, but we shouldn't crash!
+struct FilesToRemoveCleanup {
+  // Not signal-safe.
+  ~FilesToRemoveCleanup() {
+    FileToRemoveList *Head = FilesToRemove.exchange(nullptr);
+    if (Head)
+      delete Head;
+  }
+};
+} // namespace
+
+static StringRef Argv0;
+
+/// Signals that represent requested termination. There's no bug or failure, or
+/// if there is, it's not our direct responsibility. For whatever reason, our
+/// continued execution is no longer desirable.
+static const int IntSigs[] = {
+  SIGHUP, SIGINT, SIGTERM, SIGUSR2
+};
+
+/// Signals that represent that we have a bug, and our prompt termination has
+/// been ordered.
+static const int KillSigs[] = {
+  SIGILL, SIGTRAP, SIGABRT, SIGFPE, SIGBUS, SIGSEGV, SIGQUIT
+#ifdef SIGSYS
+  , SIGSYS
+#endif
+#ifdef SIGXCPU
+  , SIGXCPU
+#endif
+#ifdef SIGXFSZ
+  , SIGXFSZ
+#endif
+#ifdef SIGEMT
+  , SIGEMT
+#endif
+};
+
+/// Signals that represent requests for status.
+static const int InfoSigs[] = {
+  SIGUSR1
+#ifdef SIGINFO
+  , SIGINFO
+#endif
+};
+
+static const size_t NumSigs =
+    array_lengthof(IntSigs) + array_lengthof(KillSigs) +
+    array_lengthof(InfoSigs) + 1 /* SIGPIPE */;
+
+
+static std::atomic<unsigned> NumRegisteredSignals = ATOMIC_VAR_INIT(0);
+static struct {
+  struct sigaction SA;
+  int SigNo;
+} RegisteredSignalInfo[NumSigs];
+
+#if defined(HAVE_SIGALTSTACK)
+// Hold onto both the old and new alternate signal stack so that it's not
+// reported as a leak. We don't make any attempt to remove our alt signal
+// stack if we remove our signal handlers; that can't be done reliably if
+// someone else is also trying to do the same thing.
+static stack_t OldAltStack;
+static void* NewAltStackPointer;
+
+static void CreateSigAltStack() {
+  const size_t AltStackSize = MINSIGSTKSZ + 64 * 1024;
+
+  // If we're executing on the alternate stack, or we already have an alternate
+  // signal stack that we're happy with, there's nothing for us to do. Don't
+  // reduce the size, some other part of the process might need a larger stack
+  // than we do.
+  if (sigaltstack(nullptr, &OldAltStack) != 0 ||
+      OldAltStack.ss_flags & SS_ONSTACK ||
+      (OldAltStack.ss_sp && OldAltStack.ss_size >= AltStackSize))
+    return;
+
+  stack_t AltStack = {};
+  AltStack.ss_sp = static_cast<char *>(safe_malloc(AltStackSize));
+  NewAltStackPointer = AltStack.ss_sp; // Save to avoid reporting a leak.
+  AltStack.ss_size = AltStackSize;
+  if (sigaltstack(&AltStack, &OldAltStack) != 0)
+    free(AltStack.ss_sp);
+}
+#else
+static void CreateSigAltStack() {}
+#endif
+
+static void RegisterHandlers() { // Not signal-safe.
+  // The mutex prevents other threads from registering handlers while we're
+  // doing it. We also have to protect the handlers and their count because
+  // a signal handler could fire while we're registeting handlers.
+  static ManagedStatic<sys::SmartMutex<true>> SignalHandlerRegistrationMutex;
+  sys::SmartScopedLock<true> Guard(*SignalHandlerRegistrationMutex);
+
+  // If the handlers are already registered, we're done.
+  if (NumRegisteredSignals.load() != 0)
+    return;
+
+  // Create an alternate stack for signal handling. This is necessary for us to
+  // be able to reliably handle signals due to stack overflow.
+  CreateSigAltStack();
+
+  enum class SignalKind { IsKill, IsInfo };
+  auto registerHandler = [&](int Signal, SignalKind Kind) {
+    unsigned Index = NumRegisteredSignals.load();
+    assert(Index < array_lengthof(RegisteredSignalInfo) &&
+           "Out of space for signal handlers!");
+
+    struct sigaction NewHandler;
+
+    switch (Kind) {
+    case SignalKind::IsKill:
+      NewHandler.sa_handler = SignalHandler;
+      NewHandler.sa_flags = SA_NODEFER | SA_RESETHAND | SA_ONSTACK;
+      break;
+    case SignalKind::IsInfo:
+      NewHandler.sa_handler = InfoSignalHandler;
+      NewHandler.sa_flags = SA_ONSTACK;
+      break;
+    }
+    sigemptyset(&NewHandler.sa_mask);
+
+    // Install the new handler, save the old one in RegisteredSignalInfo.
+    sigaction(Signal, &NewHandler, &RegisteredSignalInfo[Index].SA);
+    RegisteredSignalInfo[Index].SigNo = Signal;
+    ++NumRegisteredSignals;
+  };
+
+  for (auto S : IntSigs)
+    registerHandler(S, SignalKind::IsKill);
+  for (auto S : KillSigs)
+    registerHandler(S, SignalKind::IsKill);
+  if (OneShotPipeSignalFunction)
+    registerHandler(SIGPIPE, SignalKind::IsKill);
+  for (auto S : InfoSigs)
+    registerHandler(S, SignalKind::IsInfo);
+}
+
+void sys::unregisterHandlers() {
+  // Restore all of the signal handlers to how they were before we showed up.
+  for (unsigned i = 0, e = NumRegisteredSignals.load(); i != e; ++i) {
+    sigaction(RegisteredSignalInfo[i].SigNo,
+              &RegisteredSignalInfo[i].SA, nullptr);
+    --NumRegisteredSignals;
+  }
+}
+
+/// Process the FilesToRemove list.
+static void RemoveFilesToRemove() {
+  FileToRemoveList::removeAllFiles(FilesToRemove);
+}
+
+void sys::CleanupOnSignal(uintptr_t Context) {
+  int Sig = (int)Context;
+
+  if (llvm::is_contained(InfoSigs, Sig)) {
+    InfoSignalHandler(Sig);
+    return;
+  }
+
+  RemoveFilesToRemove();
+
+  if (llvm::is_contained(IntSigs, Sig) || Sig == SIGPIPE)
+    return;
+
+  llvm::sys::RunSignalHandlers();
+}
+
+// The signal handler that runs.
+static RETSIGTYPE SignalHandler(int Sig) {
+  // Restore the signal behavior to default, so that the program actually
+  // crashes when we return and the signal reissues.  This also ensures that if
+  // we crash in our signal handler that the program will terminate immediately
+  // instead of recursing in the signal handler.
+  sys::unregisterHandlers();
+
+  // Unmask all potentially blocked kill signals.
+  sigset_t SigMask;
+  sigfillset(&SigMask);
+  sigprocmask(SIG_UNBLOCK, &SigMask, nullptr);
+
+  {
+    RemoveFilesToRemove();
+
+    if (Sig == SIGPIPE)
+      if (auto OldOneShotPipeFunction =
+              OneShotPipeSignalFunction.exchange(nullptr))
+        return OldOneShotPipeFunction();
+
+    bool IsIntSig = llvm::is_contained(IntSigs, Sig);
+    if (IsIntSig)
+      if (auto OldInterruptFunction = InterruptFunction.exchange(nullptr))
+        return OldInterruptFunction();
+
+    if (Sig == SIGPIPE || IsIntSig) {
+      raise(Sig); // Execute the default handler.
+      return;
+    }
+  }
+
+  // Otherwise if it is a fault (like SEGV) run any handler.
+  llvm::sys::RunSignalHandlers();
+
+#ifdef __s390__
+  // On S/390, certain signals are delivered with PSW Address pointing to
+  // *after* the faulting instruction.  Simply returning from the signal
+  // handler would continue execution after that point, instead of
+  // re-raising the signal.  Raise the signal manually in those cases.
+  if (Sig == SIGILL || Sig == SIGFPE || Sig == SIGTRAP)
+    raise(Sig);
+#endif
+}
+
+static RETSIGTYPE InfoSignalHandler(int Sig) {
+  SaveAndRestore<int> SaveErrnoDuringASignalHandler(errno);
+  if (SignalHandlerFunctionType CurrentInfoFunction = InfoSignalFunction)
+    CurrentInfoFunction();
+}
+
+void llvm::sys::RunInterruptHandlers() {
+  RemoveFilesToRemove();
+}
+
+void llvm::sys::SetInterruptFunction(void (*IF)()) {
+  InterruptFunction.exchange(IF);
+  RegisterHandlers();
+}
+
+void llvm::sys::SetInfoSignalFunction(void (*Handler)()) {
+  InfoSignalFunction.exchange(Handler);
+  RegisterHandlers();
+}
+
+void llvm::sys::SetOneShotPipeSignalFunction(void (*Handler)()) {
+  OneShotPipeSignalFunction.exchange(Handler);
+  RegisterHandlers();
+}
+
+void llvm::sys::DefaultOneShotPipeSignalHandler() {
+  // Send a special return code that drivers can check for, from sysexits.h.
+  exit(EX_IOERR);
+}
+
+// The public API
+bool llvm::sys::RemoveFileOnSignal(StringRef Filename,
+                                   std::string* ErrMsg) {
+  // Ensure that cleanup will occur as soon as one file is added.
+  static ManagedStatic<FilesToRemoveCleanup> FilesToRemoveCleanup;
+  *FilesToRemoveCleanup;
+  FileToRemoveList::insert(FilesToRemove, Filename.str());
+  RegisterHandlers();
+  return false;
+}
+
+// The public API
+void llvm::sys::DontRemoveFileOnSignal(StringRef Filename) {
+  FileToRemoveList::erase(FilesToRemove, Filename.str());
+}
+
+/// Add a function to be called when a signal is delivered to the process. The
+/// handler can have a cookie passed to it to identify what instance of the
+/// handler it is.
+void llvm::sys::AddSignalHandler(sys::SignalHandlerCallback FnPtr,
+                                 void *Cookie) { // Signal-safe.
+  insertSignalHandler(FnPtr, Cookie);
+  RegisterHandlers();
+}
+
+#if defined(HAVE_BACKTRACE) && ENABLE_BACKTRACES && HAVE_LINK_H &&    \
+    (defined(__linux__) || defined(__FreeBSD__) ||                             \
+     defined(__FreeBSD_kernel__) || defined(__NetBSD__))
+struct DlIteratePhdrData {
+  void **StackTrace;
+  int depth;
+  bool first;
+  const char **modules;
+  intptr_t *offsets;
+  const char *main_exec_name;
+};
+
+static int dl_iterate_phdr_cb(dl_phdr_info *info, size_t size, void *arg) {
+  DlIteratePhdrData *data = (DlIteratePhdrData*)arg;
+  const char *name = data->first ? data->main_exec_name : info->dlpi_name;
+  data->first = false;
+  for (int i = 0; i < info->dlpi_phnum; i++) {
+    const auto *phdr = &info->dlpi_phdr[i];
+    if (phdr->p_type != PT_LOAD)
+      continue;
+    intptr_t beg = info->dlpi_addr + phdr->p_vaddr;
+    intptr_t end = beg + phdr->p_memsz;
+    for (int j = 0; j < data->depth; j++) {
+      if (data->modules[j])
+        continue;
+      intptr_t addr = (intptr_t)data->StackTrace[j];
+      if (beg <= addr && addr < end) {
+        data->modules[j] = name;
+        data->offsets[j] = addr - info->dlpi_addr;
+      }
+    }
+  }
+  return 0;
+}
+
+/// If this is an ELF platform, we can find all loaded modules and their virtual
+/// addresses with dl_iterate_phdr.
+static bool findModulesAndOffsets(void **StackTrace, int Depth,
+                                  const char **Modules, intptr_t *Offsets,
+                                  const char *MainExecutableName,
+                                  StringSaver &StrPool) {
+  DlIteratePhdrData data = {StackTrace, Depth,   true,
+                            Modules,    Offsets, MainExecutableName};
+  dl_iterate_phdr(dl_iterate_phdr_cb, &data);
+  return true;
+}
+#else
+/// This platform does not have dl_iterate_phdr, so we do not yet know how to
+/// find all loaded DSOs.
+static bool findModulesAndOffsets(void **StackTrace, int Depth,
+                                  const char **Modules, intptr_t *Offsets,
+                                  const char *MainExecutableName,
+                                  StringSaver &StrPool) {
+  return false;
+}
+#endif // defined(HAVE_BACKTRACE) && ENABLE_BACKTRACES && ...
+
+#if ENABLE_BACKTRACES && defined(HAVE__UNWIND_BACKTRACE)
+static int unwindBacktrace(void **StackTrace, int MaxEntries) {
+  if (MaxEntries < 0)
+    return 0;
+
+  // Skip the first frame ('unwindBacktrace' itself).
+  int Entries = -1;
+
+  auto HandleFrame = [&](_Unwind_Context *Context) -> _Unwind_Reason_Code {
+    // Apparently we need to detect reaching the end of the stack ourselves.
+    void *IP = (void *)_Unwind_GetIP(Context);
+    if (!IP)
+      return _URC_END_OF_STACK;
+
+    assert(Entries < MaxEntries && "recursively called after END_OF_STACK?");
+    if (Entries >= 0)
+      StackTrace[Entries] = IP;
+
+    if (++Entries == MaxEntries)
+      return _URC_END_OF_STACK;
+    return _URC_NO_REASON;
+  };
+
+  _Unwind_Backtrace(
+      [](_Unwind_Context *Context, void *Handler) {
+        return (*static_cast<decltype(HandleFrame) *>(Handler))(Context);
+      },
+      static_cast<void *>(&HandleFrame));
+  return std::max(Entries, 0);
+}
+#endif
+
+// In the case of a program crash or fault, print out a stack trace so that the
+// user has an indication of why and where we died.
+//
+// On glibc systems we have the 'backtrace' function, which works nicely, but
+// doesn't demangle symbols.
+void llvm::sys::PrintStackTrace(raw_ostream &OS, int Depth) {
+#if ENABLE_BACKTRACES
+  static void *StackTrace[256];
+  int depth = 0;
+#if defined(HAVE_BACKTRACE)
+  // Use backtrace() to output a backtrace on Linux systems with glibc.
+  if (!depth)
+    depth = backtrace(StackTrace, static_cast<int>(array_lengthof(StackTrace)));
+#endif
+#if defined(HAVE__UNWIND_BACKTRACE)
+  // Try _Unwind_Backtrace() if backtrace() failed.
+  if (!depth)
+    depth = unwindBacktrace(StackTrace,
+                        static_cast<int>(array_lengthof(StackTrace)));
+#endif
+  if (!depth)
+    return;
+  // If "Depth" is not provided by the caller, use the return value of
+  // backtrace() for printing a symbolized stack trace.
+  if (!Depth)
+    Depth = depth;
+  if (printSymbolizedStackTrace(Argv0, StackTrace, Depth, OS))
+    return;
+  OS << "Stack dump without symbol names (ensure you have llvm-symbolizer in "
+        "your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point "
+        "to it):\n";
+#if HAVE_DLFCN_H && HAVE_DLADDR
+  int width = 0;
+  for (int i = 0; i < depth; ++i) {
+    Dl_info dlinfo;
+    dladdr(StackTrace[i], &dlinfo);
+    const char* name = strrchr(dlinfo.dli_fname, '/');
+
+    int nwidth;
+    if (!name) nwidth = strlen(dlinfo.dli_fname);
+    else       nwidth = strlen(name) - 1;
+
+    if (nwidth > width) width = nwidth;
+  }
+
+  for (int i = 0; i < depth; ++i) {
+    Dl_info dlinfo;
+    dladdr(StackTrace[i], &dlinfo);
+
+    OS << format("%-2d", i);
+
+    const char* name = strrchr(dlinfo.dli_fname, '/');
+    if (!name) OS << format(" %-*s", width, dlinfo.dli_fname);
+    else       OS << format(" %-*s", width, name+1);
+
+    OS << format(" %#0*lx", (int)(sizeof(void*) * 2) + 2,
+                 (unsigned long)StackTrace[i]);
+
+    if (dlinfo.dli_sname != nullptr) {
+      OS << ' ';
+      int res;
+      char* d = itaniumDemangle(dlinfo.dli_sname, nullptr, nullptr, &res);
+      if (!d) OS << dlinfo.dli_sname;
+      else    OS << d;
+      free(d);
+
+      OS << format(" + %tu", (static_cast<const char*>(StackTrace[i])-
+                              static_cast<const char*>(dlinfo.dli_saddr)));
+    }
+    OS << '\n';
+  }
+#elif defined(HAVE_BACKTRACE)
+  backtrace_symbols_fd(StackTrace, Depth, STDERR_FILENO);
+#endif
+#endif
+}
+
+static void PrintStackTraceSignalHandler(void *) {
+  sys::PrintStackTrace(llvm::errs());
+}
+
+void llvm::sys::DisableSystemDialogsOnCrash() {}
+
+/// When an error signal (such as SIGABRT or SIGSEGV) is delivered to the
+/// process, print a stack trace and then exit.
+void llvm::sys::PrintStackTraceOnErrorSignal(StringRef Argv0,
+                                             bool DisableCrashReporting) {
+  ::Argv0 = Argv0;
+
+  AddSignalHandler(PrintStackTraceSignalHandler, nullptr);
+
+#if defined(__APPLE__) && ENABLE_CRASH_OVERRIDES
+  // Environment variable to disable any kind of crash dialog.
+  if (DisableCrashReporting || getenv("LLVM_DISABLE_CRASH_REPORT")) {
+    mach_port_t self = mach_task_self();
+
+    exception_mask_t mask = EXC_MASK_CRASH;
+
+    kern_return_t ret = task_set_exception_ports(self,
+                             mask,
+                             MACH_PORT_NULL,
+                             EXCEPTION_STATE_IDENTITY | MACH_EXCEPTION_CODES,
+                             THREAD_STATE_NONE);
+    (void)ret;
+  }
+#endif
+}
diff --git a/contrib/libs/llvm12/lib/Support/Unix/ThreadLocal.inc b/contrib/libs/llvm12/lib/Support/Unix/ThreadLocal.inc
new file mode 100644
index 00000000000..a402ae98042
--- /dev/null
+++ b/contrib/libs/llvm12/lib/Support/Unix/ThreadLocal.inc
@@ -0,0 +1,70 @@
+//=== llvm/Support/Unix/ThreadLocal.inc - Unix Thread Local Data -*- C++ -*-===//
+//
+// 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 implements the Unix specific (non-pthread) ThreadLocal class.
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only generic UNIX code that
+//===          is guaranteed to work on *all* UNIX variants.
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Config/config.h"
+
+#if defined(HAVE_PTHREAD_H) && defined(HAVE_PTHREAD_GETSPECIFIC)
+
+#include <cassert>
+#include <pthread.h>
+#include <stdlib.h>
+
+namespace llvm {
+using namespace sys;
+
+ThreadLocalImpl::ThreadLocalImpl() : data() {
+  static_assert(sizeof(pthread_key_t) <= sizeof(data), "size too big");
+  pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data);
+  int errorcode = pthread_key_create(key, nullptr);
+  assert(errorcode == 0);
+  (void) errorcode;
+}
+
+ThreadLocalImpl::~ThreadLocalImpl() {
+  pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data);
+  int errorcode = pthread_key_delete(*key);
+  assert(errorcode == 0);
+  (void) errorcode;
+}
+
+void ThreadLocalImpl::setInstance(const void* d) {
+  pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data);
+  int errorcode = pthread_setspecific(*key, d);
+  assert(errorcode == 0);
+  (void) errorcode;
+}
+
+void *ThreadLocalImpl::getInstance() {
+  pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data);
+  return pthread_getspecific(*key);
+}
+
+void ThreadLocalImpl::removeInstance() {
+  setInstance(nullptr);
+}
+
+}
+#else
+namespace llvm {
+using namespace sys;
+ThreadLocalImpl::ThreadLocalImpl() : data() { }
+ThreadLocalImpl::~ThreadLocalImpl() { }
+void ThreadLocalImpl::setInstance(const void* d) { data = const_cast<void*>(d);}
+void *ThreadLocalImpl::getInstance() { return data; }
+void ThreadLocalImpl::removeInstance() { setInstance(0); }
+}
+#endif
diff --git a/contrib/libs/llvm12/lib/Support/Unix/Threading.inc b/contrib/libs/llvm12/lib/Support/Unix/Threading.inc
new file mode 100644
index 00000000000..a745495d6e8
--- /dev/null
+++ b/contrib/libs/llvm12/lib/Support/Unix/Threading.inc
@@ -0,0 +1,311 @@
+//===- Unix/Threading.inc - Unix Threading Implementation ----- -*- C++ -*-===//
+//
+// 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 provides the Unix specific implementation of Threading functions.
+//
+//===----------------------------------------------------------------------===//
+
+#include "Unix.h"
+#include "llvm/ADT/ScopeExit.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/Twine.h"
+
+#if defined(__APPLE__)
+#include <mach/mach_init.h>
+#include <mach/mach_port.h>
+#endif
+
+#include <pthread.h>
+
+#if defined(__FreeBSD__) || defined(__OpenBSD__)
+#include <pthread_np.h> // For pthread_getthreadid_np() / pthread_set_name_np()
+#endif
+
+#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
+#include <errno.h>
+#include <sys/cpuset.h>
+#include <sys/sysctl.h>
+#include <sys/user.h>
+#include <unistd.h>
+#endif
+
+#if defined(__NetBSD__)
+#error #include <lwp.h> // For _lwp_self()
+#endif
+
+#if defined(__OpenBSD__)
+#include <unistd.h> // For getthrid()
+#endif
+
+#if defined(__linux__)
+#include <sched.h>       // For sched_getaffinity
+#include <sys/syscall.h> // For syscall codes
+#include <unistd.h>      // For syscall()
+#endif
+
+static void *threadFuncSync(void *Arg) {
+  SyncThreadInfo *TI = static_cast<SyncThreadInfo *>(Arg);
+  TI->UserFn(TI->UserData);
+  return nullptr;
+}
+
+static void *threadFuncAsync(void *Arg) {
+  std::unique_ptr<AsyncThreadInfo> Info(static_cast<AsyncThreadInfo *>(Arg));
+  (*Info)();
+  return nullptr;
+}
+
+static void
+llvm_execute_on_thread_impl(void *(*ThreadFunc)(void *), void *Arg,
+                            llvm::Optional<unsigned> StackSizeInBytes,
+                            JoiningPolicy JP) {
+  int errnum;
+
+  // Construct the attributes object.
+  pthread_attr_t Attr;
+  if ((errnum = ::pthread_attr_init(&Attr)) != 0) {
+    ReportErrnumFatal("pthread_attr_init failed", errnum);
+  }
+
+  auto AttrGuard = llvm::make_scope_exit([&] {
+    if ((errnum = ::pthread_attr_destroy(&Attr)) != 0) {
+      ReportErrnumFatal("pthread_attr_destroy failed", errnum);
+    }
+  });
+
+  // Set the requested stack size, if given.
+  if (StackSizeInBytes) {
+    if ((errnum = ::pthread_attr_setstacksize(&Attr, *StackSizeInBytes)) != 0) {
+      ReportErrnumFatal("pthread_attr_setstacksize failed", errnum);
+    }
+  }
+
+  // Construct and execute the thread.
+  pthread_t Thread;
+  if ((errnum = ::pthread_create(&Thread, &Attr, ThreadFunc, Arg)) != 0)
+    ReportErrnumFatal("pthread_create failed", errnum);
+
+  if (JP == JoiningPolicy::Join) {
+    // Wait for the thread
+    if ((errnum = ::pthread_join(Thread, nullptr)) != 0) {
+      ReportErrnumFatal("pthread_join failed", errnum);
+    }
+  } else if (JP == JoiningPolicy::Detach) {
+    if ((errnum = ::pthread_detach(Thread)) != 0) {
+      ReportErrnumFatal("pthread_detach failed", errnum);
+    }
+  }
+}
+
+uint64_t llvm::get_threadid() {
+#if defined(__APPLE__)
+  // Calling "mach_thread_self()" bumps the reference count on the thread
+  // port, so we need to deallocate it. mach_task_self() doesn't bump the ref
+  // count.
+  thread_port_t Self = mach_thread_self();
+  mach_port_deallocate(mach_task_self(), Self);
+  return Self;
+#elif defined(__FreeBSD__)
+  return uint64_t(pthread_getthreadid_np());
+#elif defined(__NetBSD__)
+  return uint64_t(_lwp_self());
+#elif defined(__OpenBSD__)
+  return uint64_t(getthrid());
+#elif defined(__ANDROID__)
+  return uint64_t(gettid());
+#elif defined(__linux__)
+  return uint64_t(syscall(SYS_gettid));
+#else
+  return uint64_t(pthread_self());
+#endif
+}
+
+
+static constexpr uint32_t get_max_thread_name_length_impl() {
+#if defined(__NetBSD__)
+  return PTHREAD_MAX_NAMELEN_NP;
+#elif defined(__APPLE__)
+  return 64;
+#elif defined(__linux__)
+#if HAVE_PTHREAD_SETNAME_NP
+  return 16;
+#else
+  return 0;
+#endif
+#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
+  return 16;
+#elif defined(__OpenBSD__)
+  return 32;
+#else
+  return 0;
+#endif
+}
+
+uint32_t llvm::get_max_thread_name_length() {
+  return get_max_thread_name_length_impl();
+}
+
+void llvm::set_thread_name(const Twine &Name) {
+  // Make sure the input is null terminated.
+  SmallString<64> Storage;
+  StringRef NameStr = Name.toNullTerminatedStringRef(Storage);
+
+  // Truncate from the beginning, not the end, if the specified name is too
+  // long.  For one, this ensures that the resulting string is still null
+  // terminated, but additionally the end of a long thread name will usually
+  // be more unique than the beginning, since a common pattern is for similar
+  // threads to share a common prefix.
+  // Note that the name length includes the null terminator.
+  if (get_max_thread_name_length() > 0)
+    NameStr = NameStr.take_back(get_max_thread_name_length() - 1);
+  (void)NameStr;
+#if defined(__linux__)
+#if (defined(__GLIBC__) && defined(_GNU_SOURCE)) || defined(__ANDROID__)
+#if HAVE_PTHREAD_SETNAME_NP
+  ::pthread_setname_np(::pthread_self(), NameStr.data());
+#endif
+#endif
+#elif defined(__FreeBSD__) || defined(__OpenBSD__)
+  ::pthread_set_name_np(::pthread_self(), NameStr.data());
+#elif defined(__NetBSD__)
+  ::pthread_setname_np(::pthread_self(), "%s",
+    const_cast<char *>(NameStr.data()));
+#elif defined(__APPLE__)
+  ::pthread_setname_np(NameStr.data());
+#endif
+}
+
+void llvm::get_thread_name(SmallVectorImpl<char> &Name) {
+  Name.clear();
+
+#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
+  int pid = ::getpid();
+  uint64_t tid = get_threadid();
+
+  struct kinfo_proc *kp = nullptr, *nkp;
+  size_t len = 0;
+  int error;
+  int ctl[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PID | KERN_PROC_INC_THREAD,
+    (int)pid };
+
+  while (1) {
+    error = sysctl(ctl, 4, kp, &len, nullptr, 0);
+    if (kp == nullptr || (error != 0 && errno == ENOMEM)) {
+      // Add extra space in case threads are added before next call.
+      len += sizeof(*kp) + len / 10;
+      nkp = (struct kinfo_proc *)::realloc(kp, len);
+      if (nkp == nullptr) {
+        free(kp);
+        return;
+      }
+      kp = nkp;
+      continue;
+    }
+    if (error != 0)
+      len = 0;
+    break;
+  }
+
+  for (size_t i = 0; i < len / sizeof(*kp); i++) {
+    if (kp[i].ki_tid == (lwpid_t)tid) {
+      Name.append(kp[i].ki_tdname, kp[i].ki_tdname + strlen(kp[i].ki_tdname));
+      break;
+    }
+  }
+  free(kp);
+  return;
+#elif defined(__NetBSD__)
+  constexpr uint32_t len = get_max_thread_name_length_impl();
+  char buf[len];
+  ::pthread_getname_np(::pthread_self(), buf, len);
+
+  Name.append(buf, buf + strlen(buf));
+#elif defined(__OpenBSD__)
+  constexpr uint32_t len = get_max_thread_name_length_impl();
+  char buf[len];
+  ::pthread_get_name_np(::pthread_self(), buf, len);
+
+  Name.append(buf, buf + strlen(buf));
+#elif defined(__linux__)
+#if HAVE_PTHREAD_GETNAME_NP
+  constexpr uint32_t len = get_max_thread_name_length_impl();
+  char Buffer[len] = {'\0'};  // FIXME: working around MSan false positive.
+  if (0 == ::pthread_getname_np(::pthread_self(), Buffer, len))
+    Name.append(Buffer, Buffer + strlen(Buffer));
+#endif
+#endif
+}
+
+SetThreadPriorityResult llvm::set_thread_priority(ThreadPriority Priority) {
+#if defined(__linux__) && defined(SCHED_IDLE)
+  // Some *really* old glibcs are missing SCHED_IDLE.
+  // http://man7.org/linux/man-pages/man3/pthread_setschedparam.3.html
+  // http://man7.org/linux/man-pages/man2/sched_setscheduler.2.html
+  sched_param priority;
+  // For each of the above policies, param->sched_priority must be 0.
+  priority.sched_priority = 0;
+  // SCHED_IDLE    for running very low priority background jobs.
+  // SCHED_OTHER   the standard round-robin time-sharing policy;
+  return !pthread_setschedparam(
+             pthread_self(),
+             Priority == ThreadPriority::Background ? SCHED_IDLE : SCHED_OTHER,
+             &priority)
+             ? SetThreadPriorityResult::SUCCESS
+             : SetThreadPriorityResult::FAILURE;
+#elif defined(__APPLE__)
+  // https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/getpriority.2.html
+  // When setting a thread into background state the scheduling priority is set
+  // to lowest value, disk and network IO are throttled. Network IO will be
+  // throttled for any sockets the thread opens after going into background
+  // state. Any previously opened sockets are not affected.
+
+  // https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man3/getiopolicy_np.3.html
+  // I/Os with THROTTLE policy are called THROTTLE I/Os. If a THROTTLE I/O
+  // request occurs within a small time window (usually a fraction of a second)
+  // of another NORMAL I/O request, the thread that issues the THROTTLE I/O is
+  // forced to sleep for a certain interval. This slows down the thread that
+  // issues the THROTTLE I/O so that NORMAL I/Os can utilize most of the disk
+  // I/O bandwidth.
+  return !setpriority(PRIO_DARWIN_THREAD, 0,
+                      Priority == ThreadPriority::Background ? PRIO_DARWIN_BG
+                                                             : 0)
+             ? SetThreadPriorityResult::SUCCESS
+             : SetThreadPriorityResult::FAILURE;
+#endif
+  return SetThreadPriorityResult::FAILURE;
+}
+
+#include <thread>
+
+int computeHostNumHardwareThreads() {
+#if defined(__FreeBSD__)
+  cpuset_t mask;
+  CPU_ZERO(&mask);
+  if (cpuset_getaffinity(CPU_LEVEL_WHICH, CPU_WHICH_TID, -1, sizeof(mask),
+                         &mask) == 0)
+    return CPU_COUNT(&mask);
+#elif defined(__linux__)
+  cpu_set_t Set;
+  if (sched_getaffinity(0, sizeof(Set), &Set) == 0)
+    return CPU_COUNT(&Set);
+#endif
+  // Guard against std::thread::hardware_concurrency() returning 0.
+  if (unsigned Val = std::thread::hardware_concurrency())
+    return Val;
+  return 1;
+}
+
+void llvm::ThreadPoolStrategy::apply_thread_strategy(
+    unsigned ThreadPoolNum) const {}
+
+llvm::BitVector llvm::get_thread_affinity_mask() {
+  // FIXME: Implement
+  llvm_unreachable("Not implemented!");
+}
+
+unsigned llvm::get_cpus() { return 1; }
diff --git a/contrib/libs/llvm12/lib/Support/Unix/Unix.h b/contrib/libs/llvm12/lib/Support/Unix/Unix.h
new file mode 100644
index 00000000000..60929139598
--- /dev/null
+++ b/contrib/libs/llvm12/lib/Support/Unix/Unix.h
@@ -0,0 +1,110 @@
+//===- llvm/Support/Unix/Unix.h - Common Unix Include File -------*- C++ -*-===//
+//
+// 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 defines things specific to Unix implementations.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_SUPPORT_UNIX_UNIX_H
+#define LLVM_LIB_SUPPORT_UNIX_UNIX_H
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only generic UNIX code that
+//===          is guaranteed to work on all UNIX variants.
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Config/config.h"
+#include "llvm/Support/Chrono.h"
+#include "llvm/Support/Errno.h"
+#include "llvm/Support/ErrorHandling.h"
+#include <algorithm>
+#include <assert.h>
+#include <cerrno>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <string>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#ifdef HAVE_SYS_TIME_H
+# include <sys/time.h>
+#endif
+#include <time.h>
+
+#ifdef HAVE_DLFCN_H
+# include <dlfcn.h>
+#endif
+
+#ifdef HAVE_FCNTL_H
+# include <fcntl.h>
+#endif
+
+/// This function builds an error message into \p ErrMsg using the \p prefix
+/// string and the Unix error number given by \p errnum. If errnum is -1, the
+/// default then the value of errno is used.
+/// Make an error message
+///
+/// If the error number can be converted to a string, it will be
+/// separated from prefix by ": ".
+static inline bool MakeErrMsg(
+  std::string* ErrMsg, const std::string& prefix, int errnum = -1) {
+  if (!ErrMsg)
+    return true;
+  if (errnum == -1)
+    errnum = errno;
+  *ErrMsg = prefix + ": " + llvm::sys::StrError(errnum);
+  return true;
+}
+
+// Include StrError(errnum) in a fatal error message.
+LLVM_ATTRIBUTE_NORETURN static inline void ReportErrnumFatal(const char *Msg,
+                                                             int errnum) {
+  std::string ErrMsg;
+  MakeErrMsg(&ErrMsg, Msg, errnum);
+  llvm::report_fatal_error(ErrMsg);
+}
+
+namespace llvm {
+namespace sys {
+
+/// Convert a struct timeval to a duration. Note that timeval can be used both
+/// as a time point and a duration. Be sure to check what the input represents.
+inline std::chrono::microseconds toDuration(const struct timeval &TV) {
+  return std::chrono::seconds(TV.tv_sec) +
+         std::chrono::microseconds(TV.tv_usec);
+}
+
+/// Convert a time point to struct timespec.
+inline struct timespec toTimeSpec(TimePoint<> TP) {
+  using namespace std::chrono;
+
+  struct timespec RetVal;
+  RetVal.tv_sec = toTimeT(TP);
+  RetVal.tv_nsec = (TP.time_since_epoch() % seconds(1)).count();
+  return RetVal;
+}
+
+/// Convert a time point to struct timeval.
+inline struct timeval toTimeVal(TimePoint<std::chrono::microseconds> TP) {
+  using namespace std::chrono;
+
+  struct timeval RetVal;
+  RetVal.tv_sec = toTimeT(TP);
+  RetVal.tv_usec = (TP.time_since_epoch() % seconds(1)).count();
+  return RetVal;
+}
+
+} // namespace sys
+} // namespace llvm
+
+#endif
diff --git a/contrib/libs/llvm12/lib/Support/Unix/Watchdog.inc b/contrib/libs/llvm12/lib/Support/Unix/Watchdog.inc
new file mode 100644
index 00000000000..b363ef77956
--- /dev/null
+++ b/contrib/libs/llvm12/lib/Support/Unix/Watchdog.inc
@@ -0,0 +1,33 @@
+//===--- Unix/Watchdog.inc - Unix Watchdog Implementation -------*- C++ -*-===//
+//
+// 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 provides the generic Unix implementation of the Watchdog class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Config/config.h"
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+namespace llvm {
+  namespace sys {
+    Watchdog::Watchdog(unsigned int seconds) {
+#ifdef HAVE_UNISTD_H
+      alarm(seconds);
+#endif
+    }
+
+    Watchdog::~Watchdog() {
+#ifdef HAVE_UNISTD_H
+      alarm(0);
+#endif
+    }
+  }
+}