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📄 AArch64TargetParser.cpp(8 KB)
📄 ABIBreak.cpp(811 B)
📄 AMDGPUMetadata.cpp(9.37 KB)
📄 APFloat.cpp(155.26 KB)
📄 APInt.cpp(98.08 KB)
📄 APSInt.cpp(1.44 KB)
📄 ARMAttributeParser.cpp(13.94 KB)
📄 ARMBuildAttrs.cpp(3.45 KB)
📄 ARMTargetParser.cpp(18.09 KB)
📄 ARMWinEH.cpp(1.08 KB)
📄 Allocator.cpp(1.35 KB)
📄 Atomic.cpp(1.6 KB)
📄 BinaryStreamError.cpp(1.76 KB)
📄 BinaryStreamReader.cpp(5.24 KB)
📄 BinaryStreamRef.cpp(4.76 KB)
📄 BinaryStreamWriter.cpp(3.36 KB)
📄 BlockFrequency.cpp(2.12 KB)
📄 BranchProbability.cpp(3.44 KB)
📄 BuryPointer.cpp(1.11 KB)
📄 COM.cpp(737 B)
📄 COPYRIGHT.regex(2.65 KB)
📄 CRC.cpp(5.23 KB)
📄 CachePruning.cpp(10.33 KB)
📄 Chrono.cpp(3.17 KB)
📄 CodeGenCoverage.cpp(3.61 KB)
📄 CommandLine.cpp(89.06 KB)
📄 Compression.cpp(3.84 KB)
📄 ConvertUTF.cpp(27.27 KB)
📄 ConvertUTFWrapper.cpp(8.66 KB)
📄 CrashRecoveryContext.cpp(15.45 KB)
📄 DAGDeltaAlgorithm.cpp(12.47 KB)
📄 DJB.cpp(2.71 KB)
📄 DataExtractor.cpp(7.25 KB)
📄 Debug.cpp(5.64 KB)
📄 DebugCounter.cpp(4.95 KB)
📄 DeltaAlgorithm.cpp(3.41 KB)
📄 DynamicLibrary.cpp(6.25 KB)
📄 ELFAttributeParser.cpp(7.27 KB)
📄 ELFAttributes.cpp(1.27 KB)
📄 Errno.cpp(2.18 KB)
📄 Error.cpp(4.72 KB)
📄 ErrorHandling.cpp(11.08 KB)
📄 ExtensibleRTTI.cpp(446 B)
📄 FileCheck.cpp(95.77 KB)
📄 FileCheckImpl.h(34.14 KB)
📄 FileCollector.cpp(9.01 KB)
📄 FileOutputBuffer.cpp(6.62 KB)
📄 FileUtilities.cpp(10.81 KB)
📄 FoldingSet.cpp(15.89 KB)
📄 FormatVariadic.cpp(5.17 KB)
📄 FormattedStream.cpp(5.29 KB)
📄 GlobPattern.cpp(5 KB)
📄 GraphWriter.cpp(9.21 KB)
📄 Hashing.cpp(1.16 KB)
📄 Host.cpp(51.63 KB)
📄 InitLLVM.cpp(1.92 KB)
📄 IntEqClasses.cpp(2.18 KB)
📄 IntervalMap.cpp(4.4 KB)
📄 ItaniumManglingCanonicalizer.cpp(10.77 KB)
📄 JSON.cpp(19.1 KB)
📄 KnownBits.cpp(3.78 KB)
📄 LEB128.cpp(1.19 KB)
📄 LineIterator.cpp(2.61 KB)
📄 Locale.cpp(377 B)
📄 LockFileManager.cpp(10.64 KB)
📄 LowLevelType.cpp(2.09 KB)
📄 MD5.cpp(8.99 KB)
📄 ManagedStatic.cpp(2.37 KB)
📄 MathExtras.cpp(913 B)
📄 MemAlloc.cpp(1.01 KB)
📄 Memory.cpp(1.57 KB)
📄 MemoryBuffer.cpp(18.99 KB)
📄 NativeFormatting.cpp(7.54 KB)
📄 OptimizedStructLayout.cpp(16.7 KB)
📄 Optional.cpp(530 B)
📄 Parallel.cpp(5.08 KB)
📄 Path.cpp(36.52 KB)
📄 PluginLoader.cpp(1.63 KB)
📄 PrettyStackTrace.cpp(10.33 KB)
📄 Process.cpp(3.27 KB)
📄 Program.cpp(3.54 KB)
📄 RISCVAttributeParser.cpp(2.06 KB)
📄 RISCVAttributes.cpp(970 B)
📄 RWMutex.cpp(3.23 KB)
📄 RandomNumberGenerator.cpp(2.86 KB)
📄 Regex.cpp(6.38 KB)
📄 SHA1.cpp(10.43 KB)
📄 ScaledNumber.cpp(9.09 KB)
📄 ScopedPrinter.cpp(1.19 KB)
📄 Signals.cpp(8.35 KB)
📄 Signposts.cpp(3.24 KB)
📄 SmallPtrSet.cpp(9.21 KB)
📄 SmallVector.cpp(3.99 KB)
📄 SourceMgr.cpp(20.08 KB)
📄 SpecialCaseList.cpp(7.48 KB)
📄 Statistic.cpp(8.85 KB)
📄 StringExtras.cpp(4.34 KB)
📄 StringMap.cpp(9.31 KB)
📄 StringRef.cpp(17.41 KB)
📄 StringSaver.cpp(882 B)
📄 SuffixTree.cpp(7.23 KB)
📄 SymbolRemappingReader.cpp(2.94 KB)
📄 SystemUtils.cpp(1.06 KB)
📄 TarWriter.cpp(7.23 KB)
📄 TargetParser.cpp(9.86 KB)
📄 TargetRegistry.cpp(4.6 KB)
📄 ThreadLocal.cpp(1.68 KB)
📄 ThreadPool.cpp(4.4 KB)
📄 Threading.cpp(4.55 KB)
📄 TimeProfiler.cpp(11.63 KB)
📄 Timer.cpp(14.14 KB)
📄 ToolOutputFile.cpp(1.83 KB)
📄 TrigramIndex.cpp(3.24 KB)
📄 Triple.cpp(53.17 KB)
📄 Twine.cpp(4.6 KB)
📄 Unicode.cpp(20.14 KB)
📄 UnicodeCaseFold.cpp(15.32 KB)
📁 Unix
📄 Valgrind.cpp(1.6 KB)
📄 VersionTuple.cpp(2.74 KB)
📄 VirtualFileSystem.cpp(74.17 KB)
📄 Watchdog.cpp(738 B)
📁 Windows
📄 WithColor.cpp(4.35 KB)
📄 X86TargetParser.cpp(27.21 KB)
📄 YAMLParser.cpp(68.53 KB)
📄 YAMLTraits.cpp(28.37 KB)
📄 Z3Solver.cpp(31.44 KB)
📄 circular_raw_ostream.cpp(1.3 KB)
📄 raw_os_ostream.cpp(995 B)
📄 raw_ostream.cpp(28.97 KB)
📄 regcomp.c(39.42 KB)
📄 regengine.inc(26.49 KB)
📄 regerror.c(4.42 KB)
📄 regex2.h(6.82 KB)
📄 regex_impl.h(3.63 KB)
📄 regexec.c(5.71 KB)
📄 regfree.c(2.49 KB)
📄 regstrlcpy.c(1.56 KB)
📄 regutils.h(2.25 KB)
📄 xxhash.cpp(4.07 KB)

Editing: Signals.cpp

//===- Signals.cpp - Signal Handling support --------------------*- 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.
//
//===----------------------------------------------------------------------===//

#include "llvm/Support/Signals.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Config/llvm-config.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ErrorOr.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/FileUtilities.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/FormatAdapters.h"
#include "llvm/Support/FormatVariadic.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Mutex.h"
#include "llvm/Support/Program.h"
#include "llvm/Support/StringSaver.h"
#include "llvm/Support/raw_ostream.h"
#include <vector>

//===----------------------------------------------------------------------===//
//=== WARNING: Implementation here must contain only TRULY operating system
//===          independent code.
//===----------------------------------------------------------------------===//

using namespace llvm;

// Use explicit storage to avoid accessing cl::opt in a signal handler.
static bool DisableSymbolicationFlag = false;
static cl::opt<bool, true>
    DisableSymbolication("disable-symbolication",
                         cl::desc("Disable symbolizing crash backtraces."),
                         cl::location(DisableSymbolicationFlag), cl::Hidden);

// Callbacks to run in signal handler must be lock-free because a signal handler
// could be running as we add new callbacks. We don't add unbounded numbers of
// callbacks, an array is therefore sufficient.
struct CallbackAndCookie {
  sys::SignalHandlerCallback Callback;
  void *Cookie;
  enum class Status { Empty, Initializing, Initialized, Executing };
  std::atomic<Status> Flag;
};
static constexpr size_t MaxSignalHandlerCallbacks = 8;
static CallbackAndCookie CallBacksToRun[MaxSignalHandlerCallbacks];

// Signal-safe.
void sys::RunSignalHandlers() {
  for (size_t I = 0; I < MaxSignalHandlerCallbacks; ++I) {
    auto &RunMe = CallBacksToRun[I];
    auto Expected = CallbackAndCookie::Status::Initialized;
    auto Desired = CallbackAndCookie::Status::Executing;
    if (!RunMe.Flag.compare_exchange_strong(Expected, Desired))
      continue;
    (*RunMe.Callback)(RunMe.Cookie);
    RunMe.Callback = nullptr;
    RunMe.Cookie = nullptr;
    RunMe.Flag.store(CallbackAndCookie::Status::Empty);
  }
}

// Signal-safe.
static void insertSignalHandler(sys::SignalHandlerCallback FnPtr,
                                void *Cookie) {
  for (size_t I = 0; I < MaxSignalHandlerCallbacks; ++I) {
    auto &SetMe = CallBacksToRun[I];
    auto Expected = CallbackAndCookie::Status::Empty;
    auto Desired = CallbackAndCookie::Status::Initializing;
    if (!SetMe.Flag.compare_exchange_strong(Expected, Desired))
      continue;
    SetMe.Callback = FnPtr;
    SetMe.Cookie = Cookie;
    SetMe.Flag.store(CallbackAndCookie::Status::Initialized);
    return;
  }
  report_fatal_error("too many signal callbacks already registered");
}

static bool findModulesAndOffsets(void **StackTrace, int Depth,
                                  const char **Modules, intptr_t *Offsets,
                                  const char *MainExecutableName,
                                  StringSaver &StrPool);

/// Format a pointer value as hexadecimal. Zero pad it out so its always the
/// same width.
static FormattedNumber format_ptr(void *PC) {
  // Each byte is two hex digits plus 2 for the 0x prefix.
  unsigned PtrWidth = 2 + 2 * sizeof(void *);
  return format_hex((uint64_t)PC, PtrWidth);
}

/// Helper that launches llvm-symbolizer and symbolizes a backtrace.
LLVM_ATTRIBUTE_USED
static bool printSymbolizedStackTrace(StringRef Argv0, void **StackTrace,
                                      int Depth, llvm::raw_ostream &OS) {
  if (DisableSymbolicationFlag)
    return false;

// Don't recursively invoke the llvm-symbolizer binary.
  if (Argv0.find("llvm-symbolizer") != std::string::npos)
    return false;

// FIXME: Subtract necessary number from StackTrace entries to turn return addresses
  // into actual instruction addresses.
  // Use llvm-symbolizer tool to symbolize the stack traces. First look for it
  // alongside our binary, then in $PATH.
  ErrorOr<std::string> LLVMSymbolizerPathOrErr = std::error_code();
  if (!Argv0.empty()) {
    StringRef Parent = llvm::sys::path::parent_path(Argv0);
    if (!Parent.empty())
      LLVMSymbolizerPathOrErr = sys::findProgramByName("llvm-symbolizer", Parent);
  }
  if (!LLVMSymbolizerPathOrErr)
    LLVMSymbolizerPathOrErr = sys::findProgramByName("llvm-symbolizer");
  if (!LLVMSymbolizerPathOrErr)
    return false;
  const std::string &LLVMSymbolizerPath = *LLVMSymbolizerPathOrErr;

// If we don't know argv0 or the address of main() at this point, try
  // to guess it anyway (it's possible on some platforms).
  std::string MainExecutableName =
      sys::fs::exists(Argv0) ? (std::string)std::string(Argv0)
                             : sys::fs::getMainExecutable(nullptr, nullptr);
  BumpPtrAllocator Allocator;
  StringSaver StrPool(Allocator);
  std::vector<const char *> Modules(Depth, nullptr);
  std::vector<intptr_t> Offsets(Depth, 0);
  if (!findModulesAndOffsets(StackTrace, Depth, Modules.data(), Offsets.data(),
                             MainExecutableName.c_str(), StrPool))
    return false;
  int InputFD;
  SmallString<32> InputFile, OutputFile;
  sys::fs::createTemporaryFile("symbolizer-input", "", InputFD, InputFile);
  sys::fs::createTemporaryFile("symbolizer-output", "", OutputFile);
  FileRemover InputRemover(InputFile.c_str());
  FileRemover OutputRemover(OutputFile.c_str());

{
    raw_fd_ostream Input(InputFD, true);
    for (int i = 0; i < Depth; i++) {
      if (Modules[i])
        Input << Modules[i] << " " << (void*)Offsets[i] << "\n";
    }
  }

Optional<StringRef> Redirects[] = {StringRef(InputFile),
                                     StringRef(OutputFile), StringRef("")};
  StringRef Args[] = {"llvm-symbolizer", "--functions=linkage", "--inlining",
#ifdef _WIN32
                      // Pass --relative-address on Windows so that we don't
                      // have to add ImageBase from PE file.
                      // FIXME: Make this the default for llvm-symbolizer.
                      "--relative-address",
#endif
                      "--demangle"};
  int RunResult =
      sys::ExecuteAndWait(LLVMSymbolizerPath, Args, None, Redirects);
  if (RunResult != 0)
    return false;

// This report format is based on the sanitizer stack trace printer.  See
  // sanitizer_stacktrace_printer.cc in compiler-rt.
  auto OutputBuf = MemoryBuffer::getFile(OutputFile.c_str());
  if (!OutputBuf)
    return false;
  StringRef Output = OutputBuf.get()->getBuffer();
  SmallVector<StringRef, 32> Lines;
  Output.split(Lines, "\n");
  auto CurLine = Lines.begin();
  int frame_no = 0;
  for (int i = 0; i < Depth; i++) {
    auto PrintLineHeader = [&]() {
      OS << right_justify(formatv("#{0}", frame_no++).str(),
                          std::log10(Depth) + 2)
         << ' ' << format_ptr(StackTrace[i]) << ' ';
    };
    if (!Modules[i]) {
      PrintLineHeader();
      OS << '\n';
      continue;
    }
    // Read pairs of lines (function name and file/line info) until we
    // encounter empty line.
    for (;;) {
      if (CurLine == Lines.end())
        return false;
      StringRef FunctionName = *CurLine++;
      if (FunctionName.empty())
        break;
      PrintLineHeader();
      if (!FunctionName.startswith("??"))
        OS << FunctionName << ' ';
      if (CurLine == Lines.end())
        return false;
      StringRef FileLineInfo = *CurLine++;
      if (!FileLineInfo.startswith("??"))
        OS << FileLineInfo;
      else
        OS << "(" << Modules[i] << '+' << format_hex(Offsets[i], 0) << ")";
      OS << "\n";
    }
  }
  return true;
}

// Include the platform-specific parts of this class.
#ifdef LLVM_ON_UNIX
#include "Unix/Signals.inc"
#endif
#ifdef _WIN32
#include "Windows/Signals.inc"
#endif

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Editing: Signals.cpp

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