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📄 AArch64TargetParser.def(12.01 KB)
📄 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)
📄 BinaryStream.h(3.75 KB)
📄 BinaryStreamArray.h(12.46 KB)
📄 BinaryStreamError.h(1.29 KB)
📄 BinaryStreamReader.h(11.01 KB)
📄 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: ErrorOr.h

//===- llvm/Support/ErrorOr.h - Error Smart Pointer -------------*- 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
//
//===----------------------------------------------------------------------===//
///
/// \file
///
/// Provides ErrorOr<T> smart pointer.
///
//===----------------------------------------------------------------------===//

#ifndef LLVM_SUPPORT_ERROROR_H
#define LLVM_SUPPORT_ERROROR_H

#include "llvm/Support/AlignOf.h"
#include <cassert>
#include <system_error>
#include <type_traits>
#include <utility>

namespace llvm {

/// Represents either an error or a value T.
///
/// ErrorOr<T> is a pointer-like class that represents the result of an
/// operation. The result is either an error, or a value of type T. This is
/// designed to emulate the usage of returning a pointer where nullptr indicates
/// failure. However instead of just knowing that the operation failed, we also
/// have an error_code and optional user data that describes why it failed.
///
/// It is used like the following.
/// \code
///   ErrorOr<Buffer> getBuffer();
///
///   auto buffer = getBuffer();
///   if (error_code ec = buffer.getError())
///     return ec;
///   buffer->write("adena");
/// \endcode
///
///
/// Implicit conversion to bool returns true if there is a usable value. The
/// unary * and -> operators provide pointer like access to the value. Accessing
/// the value when there is an error has undefined behavior.
///
/// When T is a reference type the behavior is slightly different. The reference
/// is held in a std::reference_wrapper<std::remove_reference<T>::type>, and
/// there is special handling to make operator -> work as if T was not a
/// reference.
///
/// T cannot be a rvalue reference.
template<class T>
class ErrorOr {
  template <class OtherT> friend class ErrorOr;

static constexpr bool isRef = std::is_reference<T>::value;

using wrap = std::reference_wrapper<std::remove_reference_t<T>>;

public:
  using storage_type = std::conditional_t<isRef, wrap, T>;

private:
  using reference = std::remove_reference_t<T> &;
  using const_reference = const std::remove_reference_t<T> &;
  using pointer = std::remove_reference_t<T> *;
  using const_pointer = const std::remove_reference_t<T> *;

public:
  template <class E>
  ErrorOr(E ErrorCode,
          std::enable_if_t<std::is_error_code_enum<E>::value ||
                               std::is_error_condition_enum<E>::value,
                           void *> = nullptr)
      : HasError(true) {
    new (getErrorStorage()) std::error_code(make_error_code(ErrorCode));
  }

ErrorOr(std::error_code EC) : HasError(true) {
    new (getErrorStorage()) std::error_code(EC);
  }

template <class OtherT>
  ErrorOr(OtherT &&Val,
          std::enable_if_t<std::is_convertible<OtherT, T>::value> * = nullptr)
      : HasError(false) {
    new (getStorage()) storage_type(std::forward<OtherT>(Val));
  }

ErrorOr(const ErrorOr &Other) {
    copyConstruct(Other);
  }

template <class OtherT>
  ErrorOr(const ErrorOr<OtherT> &Other,
          std::enable_if_t<std::is_convertible<OtherT, T>::value> * = nullptr) {
    copyConstruct(Other);
  }

template <class OtherT>
  explicit ErrorOr(
      const ErrorOr<OtherT> &Other,
      std::enable_if_t<!std::is_convertible<OtherT, const T &>::value> * =
          nullptr) {
    copyConstruct(Other);
  }

ErrorOr(ErrorOr &&Other) {
    moveConstruct(std::move(Other));
  }

template <class OtherT>
  ErrorOr(ErrorOr<OtherT> &&Other,
          std::enable_if_t<std::is_convertible<OtherT, T>::value> * = nullptr) {
    moveConstruct(std::move(Other));
  }

// This might eventually need SFINAE but it's more complex than is_convertible
  // & I'm too lazy to write it right now.
  template <class OtherT>
  explicit ErrorOr(
      ErrorOr<OtherT> &&Other,
      std::enable_if_t<!std::is_convertible<OtherT, T>::value> * = nullptr) {
    moveConstruct(std::move(Other));
  }

ErrorOr &operator=(const ErrorOr &Other) {
    copyAssign(Other);
    return *this;
  }

ErrorOr &operator=(ErrorOr &&Other) {
    moveAssign(std::move(Other));
    return *this;
  }

~ErrorOr() {
    if (!HasError)
      getStorage()->~storage_type();
  }

/// Return false if there is an error.
  explicit operator bool() const {
    return !HasError;
  }

reference get() { return *getStorage(); }
  const_reference get() const { return const_cast<ErrorOr<T> *>(this)->get(); }

std::error_code getError() const {
    return HasError ? *getErrorStorage() : std::error_code();
  }

pointer operator ->() {
    return toPointer(getStorage());
  }

const_pointer operator->() const { return toPointer(getStorage()); }

reference operator *() {
    return *getStorage();
  }

const_reference operator*() const { return *getStorage(); }

private:
  template <class OtherT>
  void copyConstruct(const ErrorOr<OtherT> &Other) {
    if (!Other.HasError) {
      // Get the other value.
      HasError = false;
      new (getStorage()) storage_type(*Other.getStorage());
    } else {
      // Get other's error.
      HasError = true;
      new (getErrorStorage()) std::error_code(Other.getError());
    }
  }

template <class T1>
  static bool compareThisIfSameType(const T1 &a, const T1 &b) {
    return &a == &b;
  }

template <class T1, class T2>
  static bool compareThisIfSameType(const T1 &a, const T2 &b) {
    return false;
  }

template <class OtherT>
  void copyAssign(const ErrorOr<OtherT> &Other) {
    if (compareThisIfSameType(*this, Other))
      return;

this->~ErrorOr();
    new (this) ErrorOr(Other);
  }

template <class OtherT>
  void moveConstruct(ErrorOr<OtherT> &&Other) {
    if (!Other.HasError) {
      // Get the other value.
      HasError = false;
      new (getStorage()) storage_type(std::move(*Other.getStorage()));
    } else {
      // Get other's error.
      HasError = true;
      new (getErrorStorage()) std::error_code(Other.getError());
    }
  }

template <class OtherT>
  void moveAssign(ErrorOr<OtherT> &&Other) {
    if (compareThisIfSameType(*this, Other))
      return;

this->~ErrorOr();
    new (this) ErrorOr(std::move(Other));
  }

pointer toPointer(pointer Val) {
    return Val;
  }

const_pointer toPointer(const_pointer Val) const { return Val; }

pointer toPointer(wrap *Val) {
    return &Val->get();
  }

const_pointer toPointer(const wrap *Val) const { return &Val->get(); }

storage_type *getStorage() {
    assert(!HasError && "Cannot get value when an error exists!");
    return reinterpret_cast<storage_type*>(TStorage.buffer);
  }

const storage_type *getStorage() const {
    assert(!HasError && "Cannot get value when an error exists!");
    return reinterpret_cast<const storage_type*>(TStorage.buffer);
  }

std::error_code *getErrorStorage() {
    assert(HasError && "Cannot get error when a value exists!");
    return reinterpret_cast<std::error_code *>(ErrorStorage.buffer);
  }

const std::error_code *getErrorStorage() const {
    return const_cast<ErrorOr<T> *>(this)->getErrorStorage();
  }

union {
    AlignedCharArrayUnion<storage_type> TStorage;
    AlignedCharArrayUnion<std::error_code> ErrorStorage;
  };
  bool HasError : 1;
};

template <class T, class E>
std::enable_if_t<std::is_error_code_enum<E>::value ||
                     std::is_error_condition_enum<E>::value,
                 bool>
operator==(const ErrorOr<T> &Err, E Code) {
  return Err.getError() == Code;
}

} // end namespace llvm

#endif // LLVM_SUPPORT_ERROROR_H

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