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📄 AArch64TargetParser.h(4.89 KB)
📄 AMDGPUMetadata.h(17.98 KB)
📄 AMDHSAKernelDescriptor.h(7.63 KB)
📄 ARMAttributeParser.h(3.2 KB)
📄 ARMBuildAttributes.h(8.6 KB)
📄 ARMEHABI.h(3.72 KB)
📄 ARMTargetParser.def(18.94 KB)
📄 ARMTargetParser.h(8.76 KB)
📄 ARMWinEH.h(18.27 KB)
📄 AlignOf.h(1.56 KB)
📄 Alignment.h(12.95 KB)
📄 Allocator.h(16.54 KB)
📄 AllocatorBase.h(3.87 KB)
📄 ArrayRecycler.h(4.78 KB)
📄 Atomic.h(1.09 KB)
📄 AtomicOrdering.h(6.01 KB)
📄 Automaton.h(9.64 KB)
📄 Base64.h(1.84 KB)
📄 BinaryByteStream.h(9.14 KB)
📄 BinaryItemStream.h(3.63 KB)
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📄 BinaryStreamArray.h(12.46 KB)
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📄 BinaryStreamRef.h(10.09 KB)
📄 BinaryStreamWriter.h(7.79 KB)
📄 BlockFrequency.h(2.41 KB)
📄 BranchProbability.h(7.92 KB)
📄 BuryPointer.h(1.03 KB)
📄 CBindingWrapping.h(1.86 KB)
📄 CFGDiff.h(9.95 KB)
📄 CFGUpdate.h(4.12 KB)
📄 COM.h(1004 B)
📄 CRC.h(1.63 KB)
📄 CachePruning.h(3.5 KB)
📄 Capacity.h(972 B)
📄 Casting.h(13.92 KB)
📄 CheckedArithmetic.h(3.71 KB)
📄 Chrono.h(5.78 KB)
📄 CodeGen.h(1.96 KB)
📄 CodeGenCoverage.h(1.18 KB)
📄 CommandLine.h(71.22 KB)
📄 Compiler.h(19.5 KB)
📄 Compression.h(1.39 KB)
📄 ConvertUTF.h(11.4 KB)
📄 CrashRecoveryContext.h(9.26 KB)
📄 DJB.h(1.05 KB)
📄 DOTGraphTraits.h(5.58 KB)
📄 DataExtractor.h(30.28 KB)
📄 DataTypes.h(775 B)
📄 Debug.h(4.7 KB)
📄 DebugCounter.h(7.01 KB)
📄 DynamicLibrary.h(5.77 KB)
📄 ELFAttributeParser.h(2.22 KB)
📄 ELFAttributes.h(1.02 KB)
📄 Endian.h(14.28 KB)
📄 EndianStream.h(1.93 KB)
📄 Errc.h(3.8 KB)
📄 Errno.h(1.45 KB)
📄 Error.h(43.82 KB)
📄 ErrorHandling.h(6.39 KB)
📄 ErrorOr.h(7.48 KB)
📄 ExtensibleRTTI.h(4.02 KB)
📄 FileCheck.h(6.69 KB)
📄 FileCollector.h(3.74 KB)
📄 FileOutputBuffer.h(3.36 KB)
📄 FileSystem.h(53.03 KB)
📄 FileUtilities.h(3.83 KB)
📄 Format.h(9.45 KB)
📄 FormatAdapters.h(3.38 KB)
📄 FormatCommon.h(2.05 KB)
📄 FormatProviders.h(15.27 KB)
📄 FormatVariadic.h(9.88 KB)
📄 FormatVariadicDetails.h(5.3 KB)
📄 FormattedStream.h(6.42 KB)
📄 GenericDomTree.h(30.89 KB)
📄 GenericDomTreeConstruction.h(63.42 KB)
📄 GenericIteratedDominanceFrontier.h(7.31 KB)
📄 GlobPattern.h(1.35 KB)
📄 GraphWriter.h(11.79 KB)
📄 Host.h(2.68 KB)
📄 InitLLVM.h(1.79 KB)
📄 ItaniumManglingCanonicalizer.h(3.17 KB)
📄 JSON.h(28.25 KB)
📄 KnownBits.h(8.35 KB)
📄 LEB128.h(5.74 KB)
📄 LineIterator.h(2.62 KB)
📄 Locale.h(223 B)
📄 LockFileManager.h(3.13 KB)
📄 LowLevelTypeImpl.h(11.94 KB)
📄 MD5.h(3.39 KB)
📄 MSVCErrorWorkarounds.h(2.62 KB)
📄 MachineValueType.h(42.37 KB)
📄 ManagedStatic.h(4.21 KB)
📄 MathExtras.h(32.81 KB)
📄 MemAlloc.h(3.21 KB)
📄 Memory.h(6.94 KB)
📄 MemoryBuffer.h(10.98 KB)
📄 MipsABIFlags.h(3.92 KB)
📄 Mutex.h(2.14 KB)
📄 NativeFormatting.h(1.64 KB)
📄 OnDiskHashTable.h(21.97 KB)
📄 OptimizedStructLayout.h(5.89 KB)
📄 Parallel.h(5.99 KB)
📄 Path.h(15.6 KB)
📄 PluginLoader.h(1.29 KB)
📄 PointerLikeTypeTraits.h(5.69 KB)
📄 PrettyStackTrace.h(4.45 KB)
📄 Printable.h(1.5 KB)
📄 Process.h(9.31 KB)
📄 Program.h(10.35 KB)
📄 RISCVAttributeParser.h(1.15 KB)
📄 RISCVAttributes.h(1.2 KB)
📄 RISCVTargetParser.def(446 B)
📄 RWMutex.h(5.65 KB)
📄 RandomNumberGenerator.h(2.29 KB)
📄 Recycler.h(3.47 KB)
📄 RecyclingAllocator.h(2.38 KB)
📄 Regex.h(4.37 KB)
📄 Registry.h(5.14 KB)
📄 ReverseIteration.h(360 B)
📄 SHA1.h(2.37 KB)
📄 SMLoc.h(1.78 KB)
📄 SMTAPI.h(16.33 KB)
📄 SaveAndRestore.h(1.02 KB)
📄 ScaledNumber.h(30.65 KB)
📄 ScopedPrinter.h(11.39 KB)
📄 Signals.h(5.22 KB)
📄 Signposts.h(1.29 KB)
📄 SmallVectorMemoryBuffer.h(2.28 KB)
📁 Solaris
📄 SourceMgr.h(10.37 KB)
📄 SpecialCaseList.h(6.01 KB)
📄 StringSaver.h(1.94 KB)
📄 SuffixTree.h(13.15 KB)
📄 SwapByteOrder.h(4.8 KB)
📄 SymbolRemappingReader.h(4.36 KB)
📄 SystemUtils.h(1.02 KB)
📄 TarWriter.h(941 B)
📄 TargetOpcodes.def(22.01 KB)
📄 TargetParser.h(4.08 KB)
📄 TargetRegistry.h(46.87 KB)
📄 TargetSelect.h(6.2 KB)
📄 TaskQueue.h(4.24 KB)
📄 ThreadLocal.h(2.08 KB)
📄 ThreadPool.h(3.44 KB)
📄 Threading.h(10.62 KB)
📄 TimeProfiler.h(3.46 KB)
📄 Timer.h(8.93 KB)
📄 ToolOutputFile.h(2.24 KB)
📄 TrailingObjects.h(15.19 KB)
📄 TrigramIndex.h(2.84 KB)
📄 TypeName.h(2.13 KB)
📄 TypeSize.h(8.53 KB)
📄 Unicode.h(2.5 KB)
📄 UnicodeCharRanges.h(3.27 KB)
📄 Valgrind.h(1.16 KB)
📄 VersionTuple.h(5.22 KB)
📄 VirtualFileSystem.h(28.28 KB)
📄 Watchdog.h(1.15 KB)
📄 Win64EH.h(4.82 KB)
📁 Windows
📄 WindowsError.h(541 B)
📄 WithColor.h(4.64 KB)
📄 X86DisassemblerDecoderCommon.h(29.39 KB)
📄 X86TargetParser.def(8.21 KB)
📄 X86TargetParser.h(3.57 KB)
📄 YAMLParser.h(16.29 KB)
📄 YAMLTraits.h(67.62 KB)
📄 circular_raw_ostream.h(4.97 KB)
📄 raw_os_ostream.h(1.29 KB)
📄 raw_ostream.h(20.82 KB)
📄 raw_sha1_ostream.h(1.29 KB)
📄 thread.h(1.33 KB)
📄 type_traits.h(6.75 KB)
📄 xxhash.h(1.92 KB)

Editing: CrashRecoveryContext.h

//===--- CrashRecoveryContext.h - Crash Recovery ----------------*- 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
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_SUPPORT_CRASHRECOVERYCONTEXT_H
#define LLVM_SUPPORT_CRASHRECOVERYCONTEXT_H

#include "llvm/ADT/STLExtras.h"

namespace llvm {
class CrashRecoveryContextCleanup;

/// Crash recovery helper object.
///
/// This class implements support for running operations in a safe context so
/// that crashes (memory errors, stack overflow, assertion violations) can be
/// detected and control restored to the crashing thread. Crash detection is
/// purely "best effort", the exact set of failures which can be recovered from
/// is platform dependent.
///
/// Clients make use of this code by first calling
/// CrashRecoveryContext::Enable(), and then executing unsafe operations via a
/// CrashRecoveryContext object. For example:
///
/// \code
///    void actual_work(void *);
///
///    void foo() {
///      CrashRecoveryContext CRC;
///
///      if (!CRC.RunSafely(actual_work, 0)) {
///         ... a crash was detected, report error to user ...
///      }
///
///      ... no crash was detected ...
///    }
/// \endcode
///
/// To assist recovery the class allows specifying set of actions that will be
/// executed in any case, whether crash occurs or not. These actions may be used
/// to reclaim resources in the case of crash.
class CrashRecoveryContext {
  void *Impl;
  CrashRecoveryContextCleanup *head;

public:
  CrashRecoveryContext() : Impl(nullptr), head(nullptr) {}
  ~CrashRecoveryContext();

/// Register cleanup handler, which is used when the recovery context is
  /// finished.
  /// The recovery context owns the handler.
  void registerCleanup(CrashRecoveryContextCleanup *cleanup);

void unregisterCleanup(CrashRecoveryContextCleanup *cleanup);

/// Enable crash recovery.
  static void Enable();

/// Disable crash recovery.
  static void Disable();

/// Return the active context, if the code is currently executing in a
  /// thread which is in a protected context.
  static CrashRecoveryContext *GetCurrent();

/// Return true if the current thread is recovering from a crash.
  static bool isRecoveringFromCrash();

/// Execute the provided callback function (with the given arguments) in
  /// a protected context.
  ///
  /// \return True if the function completed successfully, and false if the
  /// function crashed (or HandleCrash was called explicitly). Clients should
  /// make as little assumptions as possible about the program state when
  /// RunSafely has returned false.
  bool RunSafely(function_ref<void()> Fn);
  bool RunSafely(void (*Fn)(void*), void *UserData) {
    return RunSafely([&]() { Fn(UserData); });
  }

/// Execute the provide callback function (with the given arguments) in
  /// a protected context which is run in another thread (optionally with a
  /// requested stack size).
  ///
  /// See RunSafely() and llvm_execute_on_thread().
  ///
  /// On Darwin, if PRIO_DARWIN_BG is set on the calling thread, it will be
  /// propagated to the new thread as well.
  bool RunSafelyOnThread(function_ref<void()>, unsigned RequestedStackSize = 0);
  bool RunSafelyOnThread(void (*Fn)(void*), void *UserData,
                         unsigned RequestedStackSize = 0) {
    return RunSafelyOnThread([&]() { Fn(UserData); }, RequestedStackSize);
  }

/// Explicitly trigger a crash recovery in the current process, and
  /// return failure from RunSafely(). This function does not return.
  LLVM_ATTRIBUTE_NORETURN
  void HandleExit(int RetCode);

/// In case of a crash, this is the crash identifier.
  int RetCode = 0;

/// Selects whether handling of failures should be done in the same way as
  /// for regular crashes. When this is active, a crash would print the
  /// callstack, clean-up any temporary files and create a coredump/minidump.
  bool DumpStackAndCleanupOnFailure = false;
};

/// Abstract base class of cleanup handlers.
///
/// Derived classes override method recoverResources, which makes actual work on
/// resource recovery.
///
/// Cleanup handlers are stored in a double list, which is owned and managed by
/// a crash recovery context.
class CrashRecoveryContextCleanup {
protected:
  CrashRecoveryContext *context = nullptr;
  CrashRecoveryContextCleanup(CrashRecoveryContext *context)
      : context(context) {}

public:
  bool cleanupFired = false;

virtual ~CrashRecoveryContextCleanup();
  virtual void recoverResources() = 0;

CrashRecoveryContext *getContext() const {
    return context;
  }

private:
  friend class CrashRecoveryContext;
  CrashRecoveryContextCleanup *prev = nullptr, *next = nullptr;
};

/// Base class of cleanup handler that controls recovery of resources of the
/// given type.
///
/// \tparam Derived Class that uses this class as a base.
/// \tparam T Type of controlled resource.
///
/// This class serves as a base for its template parameter as implied by
/// Curiously Recurring Template Pattern.
///
/// This class factors out creation of a cleanup handler. The latter requires
/// knowledge of the current recovery context, which is provided by this class.
template<typename Derived, typename T>
class CrashRecoveryContextCleanupBase : public CrashRecoveryContextCleanup {
protected:
  T *resource;
  CrashRecoveryContextCleanupBase(CrashRecoveryContext *context, T *resource)
      : CrashRecoveryContextCleanup(context), resource(resource) {}

public:
  /// Creates cleanup handler.
  /// \param x Pointer to the resource recovered by this handler.
  /// \return New handler or null if the method was called outside a recovery
  ///         context.
  static Derived *create(T *x) {
    if (x) {
      if (CrashRecoveryContext *context = CrashRecoveryContext::GetCurrent())
        return new Derived(context, x);
    }
    return nullptr;
  }
};

/// Cleanup handler that reclaims resource by calling destructor on it.
template <typename T>
class CrashRecoveryContextDestructorCleanup : public
  CrashRecoveryContextCleanupBase<CrashRecoveryContextDestructorCleanup<T>, T> {
public:
  CrashRecoveryContextDestructorCleanup(CrashRecoveryContext *context,
                                        T *resource)
      : CrashRecoveryContextCleanupBase<
            CrashRecoveryContextDestructorCleanup<T>, T>(context, resource) {}

virtual void recoverResources() {
    this->resource->~T();
  }
};

/// Cleanup handler that reclaims resource by calling 'delete' on it.
template <typename T>
class CrashRecoveryContextDeleteCleanup : public
  CrashRecoveryContextCleanupBase<CrashRecoveryContextDeleteCleanup<T>, T> {
public:
  CrashRecoveryContextDeleteCleanup(CrashRecoveryContext *context, T *resource)
    : CrashRecoveryContextCleanupBase<
        CrashRecoveryContextDeleteCleanup<T>, T>(context, resource) {}

void recoverResources() override { delete this->resource; }
};

/// Cleanup handler that reclaims resource by calling its method 'Release'.
template <typename T>
class CrashRecoveryContextReleaseRefCleanup : public
  CrashRecoveryContextCleanupBase<CrashRecoveryContextReleaseRefCleanup<T>, T> {
public:
  CrashRecoveryContextReleaseRefCleanup(CrashRecoveryContext *context,
                                        T *resource)
    : CrashRecoveryContextCleanupBase<CrashRecoveryContextReleaseRefCleanup<T>,
          T>(context, resource) {}

void recoverResources() override { this->resource->Release(); }
};

/// Helper class for managing resource cleanups.
///
/// \tparam T Type of resource been reclaimed.
/// \tparam Cleanup Class that defines how the resource is reclaimed.
///
/// Clients create objects of this type in the code executed in a crash recovery
/// context to ensure that the resource will be reclaimed even in the case of
/// crash. For example:
///
/// \code
///    void actual_work(void *) {
///      ...
///      std::unique_ptr<Resource> R(new Resource());
///      CrashRecoveryContextCleanupRegistrar D(R.get());
///      ...
///    }
///
///    void foo() {
///      CrashRecoveryContext CRC;
///
///      if (!CRC.RunSafely(actual_work, 0)) {
///         ... a crash was detected, report error to user ...
///      }
/// \endcode
///
/// If the code of `actual_work` in the example above does not crash, the
/// destructor of CrashRecoveryContextCleanupRegistrar removes cleanup code from
/// the current CrashRecoveryContext and the resource is reclaimed by the
/// destructor of std::unique_ptr. If crash happens, destructors are not called
/// and the resource is reclaimed by cleanup object registered in the recovery
/// context by the constructor of CrashRecoveryContextCleanupRegistrar.
template <typename T, typename Cleanup = CrashRecoveryContextDeleteCleanup<T> >
class CrashRecoveryContextCleanupRegistrar {
  CrashRecoveryContextCleanup *cleanup;

public:
  CrashRecoveryContextCleanupRegistrar(T *x)
    : cleanup(Cleanup::create(x)) {
    if (cleanup)
      cleanup->getContext()->registerCleanup(cleanup);
  }

~CrashRecoveryContextCleanupRegistrar() { unregister(); }

void unregister() {
    if (cleanup && !cleanup->cleanupFired)
      cleanup->getContext()->unregisterCleanup(cleanup);
    cleanup = nullptr;
  }
};
} // end namespace llvm

#endif // LLVM_SUPPORT_CRASHRECOVERYCONTEXT_H

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