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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: PrettyStackTrace.cpp

//===- PrettyStackTrace.cpp - Pretty Crash Handling -----------------------===//
//
// 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/PrettyStackTrace.h"
#include "llvm-c/ErrorHandling.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Config/config.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/SaveAndRestore.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/Watchdog.h"
#include "llvm/Support/raw_ostream.h"

#include <atomic>
#include <cassert>
#include <cstdarg>
#include <cstdio>
#include <tuple>

#ifdef HAVE_CRASHREPORTERCLIENT_H
#include <CrashReporterClient.h>
#endif

using namespace llvm;

static const char *BugReportMsg =
    "PLEASE submit a bug report to " BUG_REPORT_URL
    " and include the crash backtrace.\n";

// If backtrace support is not enabled, compile out support for pretty stack
// traces.  This has the secondary effect of not requiring thread local storage
// when backtrace support is disabled.
#if ENABLE_BACKTRACES

// We need a thread local pointer to manage the stack of our stack trace
// objects, but we *really* cannot tolerate destructors running and do not want
// to pay any overhead of synchronizing. As a consequence, we use a raw
// thread-local variable.
static LLVM_THREAD_LOCAL PrettyStackTraceEntry *PrettyStackTraceHead = nullptr;

// The use of 'volatile' here is to ensure that any particular thread always
// reloads the value of the counter. The 'std::atomic' allows us to specify that
// this variable is accessed in an unsychronized way (it's not actually
// synchronizing). This does technically mean that the value may not appear to
// be the same across threads running simultaneously on different CPUs, but in
// practice the worst that will happen is that we won't print a stack trace when
// we could have.
//
// This is initialized to 1 because 0 is used as a sentinel for "not enabled on
// the current thread". If the user happens to overflow an 'unsigned' with
// SIGINFO requests, it's possible that some threads will stop responding to it,
// but the program won't crash.
static volatile std::atomic<unsigned> GlobalSigInfoGenerationCounter =
    ATOMIC_VAR_INIT(1);
static LLVM_THREAD_LOCAL unsigned ThreadLocalSigInfoGenerationCounter = 0;

namespace llvm {
PrettyStackTraceEntry *ReverseStackTrace(PrettyStackTraceEntry *Head) {
  PrettyStackTraceEntry *Prev = nullptr;
  while (Head)
    std::tie(Prev, Head, Head->NextEntry) =
        std::make_tuple(Head, Head->NextEntry, Prev);
  return Prev;
}
}

static void PrintStack(raw_ostream &OS) {
  // Print out the stack in reverse order. To avoid recursion (which is likely
  // to fail if we crashed due to stack overflow), we do an up-front pass to
  // reverse the stack, then print it, then reverse it again.
  unsigned ID = 0;
  SaveAndRestore<PrettyStackTraceEntry *> SavedStack{PrettyStackTraceHead,
                                                     nullptr};
  PrettyStackTraceEntry *ReversedStack = ReverseStackTrace(SavedStack.get());
  for (const PrettyStackTraceEntry *Entry = ReversedStack; Entry;
       Entry = Entry->getNextEntry()) {
    OS << ID++ << ".\t";
    sys::Watchdog W(5);
    Entry->print(OS);
  }
  llvm::ReverseStackTrace(ReversedStack);
}

/// Print the current stack trace to the specified stream.
///
/// Marked NOINLINE so it can be called from debuggers.
LLVM_ATTRIBUTE_NOINLINE
static void PrintCurStackTrace(raw_ostream &OS) {
  // Don't print an empty trace.
  if (!PrettyStackTraceHead) return;

// If there are pretty stack frames registered, walk and emit them.
  OS << "Stack dump:\n";

PrintStack(OS);
  OS.flush();
}

// Integrate with crash reporter libraries.
#if defined (__APPLE__) && defined(HAVE_CRASHREPORTERCLIENT_H)
//  If any clients of llvm try to link to libCrashReporterClient.a themselves,
//  only one crash info struct will be used.
extern "C" {
CRASH_REPORTER_CLIENT_HIDDEN
struct crashreporter_annotations_t gCRAnnotations
        __attribute__((section("__DATA," CRASHREPORTER_ANNOTATIONS_SECTION)))
#if CRASHREPORTER_ANNOTATIONS_VERSION < 5
        = { CRASHREPORTER_ANNOTATIONS_VERSION, 0, 0, 0, 0, 0, 0 };
#else
        = { CRASHREPORTER_ANNOTATIONS_VERSION, 0, 0, 0, 0, 0, 0, 0 };
#endif
}
#elif defined(__APPLE__) && HAVE_CRASHREPORTER_INFO
extern "C" const char *__crashreporter_info__
    __attribute__((visibility("hidden"))) = 0;
asm(".desc ___crashreporter_info__, 0x10");
#endif

static void setCrashLogMessage(const char *msg) LLVM_ATTRIBUTE_UNUSED;
static void setCrashLogMessage(const char *msg) {
#ifdef HAVE_CRASHREPORTERCLIENT_H
  (void)CRSetCrashLogMessage(msg);
#elif HAVE_CRASHREPORTER_INFO
  __crashreporter_info__ = msg;
#endif
  // Don't reorder subsequent operations: whatever comes after might crash and
  // we want the system crash handling to see the message we just set.
  std::atomic_signal_fence(std::memory_order_seq_cst);
}

#ifdef __APPLE__
using CrashHandlerString = SmallString<2048>;
using CrashHandlerStringStorage =
    std::aligned_storage<sizeof(CrashHandlerString),
                         alignof(CrashHandlerString)>::type;
static CrashHandlerStringStorage crashHandlerStringStorage;
#endif

/// This callback is run if a fatal signal is delivered to the process, it
/// prints the pretty stack trace.
static void CrashHandler(void *) {
  errs() << BugReportMsg ;

#ifndef __APPLE__
  // On non-apple systems, just emit the crash stack trace to stderr.
  PrintCurStackTrace(errs());
#else
  // Emit the crash stack trace to a SmallString, put it where the system crash
  // handling will find it, and also send it to stderr.
  //
  // The SmallString is fairly large in the hope that we don't allocate (we're
  // handling a fatal signal, something is already pretty wrong, allocation
  // might not work). Further, we don't use a magic static in case that's also
  // borked. We leak any allocation that does occur because the program is about
  // to die anyways. This is technically racy if we were handling two fatal
  // signals, however if we're in that situation a race is the least of our
  // worries.
  auto &crashHandlerString =
      *new (&crashHandlerStringStorage) CrashHandlerString;

// If we crash while trying to print the stack trace, we still want the system
  // crash handling to have some partial information. That'll work out as long
  // as the SmallString doesn't allocate. If it does allocate then the system
  // crash handling will see some garbage because the inline buffer now contains
  // a pointer.
  setCrashLogMessage(crashHandlerString.c_str());

{
    raw_svector_ostream Stream(crashHandlerString);
    PrintCurStackTrace(Stream);
  }

if (!crashHandlerString.empty()) {
    setCrashLogMessage(crashHandlerString.c_str());
    errs() << crashHandlerString.str();
  } else
    setCrashLogMessage("No crash information.");
#endif
}

static void printForSigInfoIfNeeded() {
  unsigned CurrentSigInfoGeneration =
      GlobalSigInfoGenerationCounter.load(std::memory_order_relaxed);
  if (ThreadLocalSigInfoGenerationCounter == 0 ||
      ThreadLocalSigInfoGenerationCounter == CurrentSigInfoGeneration) {
    return;
  }

PrintCurStackTrace(errs());
  ThreadLocalSigInfoGenerationCounter = CurrentSigInfoGeneration;
}

#endif // ENABLE_BACKTRACES

void llvm::setBugReportMsg(const char *Msg) {
  BugReportMsg = Msg;
}

const char *llvm::getBugReportMsg() {
  return BugReportMsg;
}

PrettyStackTraceEntry::PrettyStackTraceEntry() {
#if ENABLE_BACKTRACES
  // Handle SIGINFO first, because we haven't finished constructing yet.
  printForSigInfoIfNeeded();
  // Link ourselves.
  NextEntry = PrettyStackTraceHead;
  PrettyStackTraceHead = this;
#endif
}

PrettyStackTraceEntry::~PrettyStackTraceEntry() {
#if ENABLE_BACKTRACES
  assert(PrettyStackTraceHead == this &&
         "Pretty stack trace entry destruction is out of order");
  PrettyStackTraceHead = NextEntry;
  // Handle SIGINFO first, because we already started destructing.
  printForSigInfoIfNeeded();
#endif
}

void PrettyStackTraceString::print(raw_ostream &OS) const { OS << Str << "\n"; }

PrettyStackTraceFormat::PrettyStackTraceFormat(const char *Format, ...) {
  va_list AP;
  va_start(AP, Format);
  const int SizeOrError = vsnprintf(nullptr, 0, Format, AP);
  va_end(AP);
  if (SizeOrError < 0) {
    return;
  }

const int Size = SizeOrError + 1; // '\0'
  Str.resize(Size);
  va_start(AP, Format);
  vsnprintf(Str.data(), Size, Format, AP);
  va_end(AP);
}

void PrettyStackTraceFormat::print(raw_ostream &OS) const { OS << Str << "\n"; }

void PrettyStackTraceProgram::print(raw_ostream &OS) const {
  OS << "Program arguments: ";
  // Print the argument list.
  for (unsigned i = 0, e = ArgC; i != e; ++i)
    OS << ArgV[i] << ' ';
  OS << '\n';
}

#if ENABLE_BACKTRACES
static bool RegisterCrashPrinter() {
  sys::AddSignalHandler(CrashHandler, nullptr);
  return false;
}
#endif

void llvm::EnablePrettyStackTrace() {
#if ENABLE_BACKTRACES
  // The first time this is called, we register the crash printer.
  static bool HandlerRegistered = RegisterCrashPrinter();
  (void)HandlerRegistered;
#endif
}

void llvm::EnablePrettyStackTraceOnSigInfoForThisThread(bool ShouldEnable) {
#if ENABLE_BACKTRACES
  if (!ShouldEnable) {
    ThreadLocalSigInfoGenerationCounter = 0;
    return;
  }

// The first time this is called, we register the SIGINFO handler.
  static bool HandlerRegistered = []{
    sys::SetInfoSignalFunction([]{
      GlobalSigInfoGenerationCounter.fetch_add(1, std::memory_order_relaxed);
    });
    return false;
  }();
  (void)HandlerRegistered;

// Next, enable it for the current thread.
  ThreadLocalSigInfoGenerationCounter =
      GlobalSigInfoGenerationCounter.load(std::memory_order_relaxed);
#endif
}

const void *llvm::SavePrettyStackState() {
#if ENABLE_BACKTRACES
  return PrettyStackTraceHead;
#else
  return nullptr;
#endif
}

void llvm::RestorePrettyStackState(const void *Top) {
#if ENABLE_BACKTRACES
  PrettyStackTraceHead =
      static_cast<PrettyStackTraceEntry *>(const_cast<void *>(Top));
#endif
}

void LLVMEnablePrettyStackTrace() {
  EnablePrettyStackTrace();
}

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Editing: PrettyStackTrace.cpp

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