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📄 AMDGPUMetadata.h(17.98 KB)
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📄 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)
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📄 Atomic.h(1.09 KB)
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📄 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: MemoryBuffer.h

//===--- MemoryBuffer.h - Memory Buffer Interface ---------------*- 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 the MemoryBuffer interface.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_SUPPORT_MEMORYBUFFER_H
#define LLVM_SUPPORT_MEMORYBUFFER_H

#include "llvm-c/Types.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Support/CBindingWrapping.h"
#include "llvm/Support/ErrorOr.h"
#include <cstddef>
#include <cstdint>
#include <memory>

namespace llvm {

class MemoryBufferRef;

namespace sys {
namespace fs {
// Duplicated from FileSystem.h to avoid a dependency.
#if defined(_WIN32)
// A Win32 HANDLE is a typedef of void*
using file_t = void *;
#else
using file_t = int;
#endif
} // namespace fs
} // namespace sys

/// This interface provides simple read-only access to a block of memory, and
/// provides simple methods for reading files and standard input into a memory
/// buffer.  In addition to basic access to the characters in the file, this
/// interface guarantees you can read one character past the end of the file,
/// and that this character will read as '\0'.
///
/// The '\0' guarantee is needed to support an optimization -- it's intended to
/// be more efficient for clients which are reading all the data to stop
/// reading when they encounter a '\0' than to continually check the file
/// position to see if it has reached the end of the file.
class MemoryBuffer {
  const char *BufferStart; // Start of the buffer.
  const char *BufferEnd;   // End of the buffer.

protected:
  MemoryBuffer() = default;

void init(const char *BufStart, const char *BufEnd,
            bool RequiresNullTerminator);

public:
  MemoryBuffer(const MemoryBuffer &) = delete;
  MemoryBuffer &operator=(const MemoryBuffer &) = delete;
  virtual ~MemoryBuffer();

const char *getBufferStart() const { return BufferStart; }
  const char *getBufferEnd() const   { return BufferEnd; }
  size_t getBufferSize() const { return BufferEnd-BufferStart; }

StringRef getBuffer() const {
    return StringRef(BufferStart, getBufferSize());
  }

/// Return an identifier for this buffer, typically the filename it was read
  /// from.
  virtual StringRef getBufferIdentifier() const { return "Unknown buffer"; }

/// Open the specified file as a MemoryBuffer, returning a new MemoryBuffer
  /// if successful, otherwise returning null. If FileSize is specified, this
  /// means that the client knows that the file exists and that it has the
  /// specified size.
  ///
  /// \param IsVolatile Set to true to indicate that the contents of the file
  /// can change outside the user's control, e.g. when libclang tries to parse
  /// while the user is editing/updating the file or if the file is on an NFS.
  static ErrorOr<std::unique_ptr<MemoryBuffer>>
  getFile(const Twine &Filename, int64_t FileSize = -1,
          bool RequiresNullTerminator = true, bool IsVolatile = false);

/// Read all of the specified file into a MemoryBuffer as a stream
  /// (i.e. until EOF reached). This is useful for special files that
  /// look like a regular file but have 0 size (e.g. /proc/cpuinfo on Linux).
  static ErrorOr<std::unique_ptr<MemoryBuffer>>
  getFileAsStream(const Twine &Filename);

/// Given an already-open file descriptor, map some slice of it into a
  /// MemoryBuffer. The slice is specified by an \p Offset and \p MapSize.
  /// Since this is in the middle of a file, the buffer is not null terminated.
  static ErrorOr<std::unique_ptr<MemoryBuffer>>
  getOpenFileSlice(sys::fs::file_t FD, const Twine &Filename, uint64_t MapSize,
                   int64_t Offset, bool IsVolatile = false);

/// Given an already-open file descriptor, read the file and return a
  /// MemoryBuffer.
  ///
  /// \param IsVolatile Set to true to indicate that the contents of the file
  /// can change outside the user's control, e.g. when libclang tries to parse
  /// while the user is editing/updating the file or if the file is on an NFS.
  static ErrorOr<std::unique_ptr<MemoryBuffer>>
  getOpenFile(sys::fs::file_t FD, const Twine &Filename, uint64_t FileSize,
              bool RequiresNullTerminator = true, bool IsVolatile = false);

/// Open the specified memory range as a MemoryBuffer. Note that InputData
  /// must be null terminated if RequiresNullTerminator is true.
  static std::unique_ptr<MemoryBuffer>
  getMemBuffer(StringRef InputData, StringRef BufferName = "",
               bool RequiresNullTerminator = true);

static std::unique_ptr<MemoryBuffer>
  getMemBuffer(MemoryBufferRef Ref, bool RequiresNullTerminator = true);

/// Open the specified memory range as a MemoryBuffer, copying the contents
  /// and taking ownership of it. InputData does not have to be null terminated.
  static std::unique_ptr<MemoryBuffer>
  getMemBufferCopy(StringRef InputData, const Twine &BufferName = "");

/// Read all of stdin into a file buffer, and return it.
  static ErrorOr<std::unique_ptr<MemoryBuffer>> getSTDIN();

/// Open the specified file as a MemoryBuffer, or open stdin if the Filename
  /// is "-".
  static ErrorOr<std::unique_ptr<MemoryBuffer>>
  getFileOrSTDIN(const Twine &Filename, int64_t FileSize = -1,
                 bool RequiresNullTerminator = true);

/// Map a subrange of the specified file as a MemoryBuffer.
  static ErrorOr<std::unique_ptr<MemoryBuffer>>
  getFileSlice(const Twine &Filename, uint64_t MapSize, uint64_t Offset,
               bool IsVolatile = false);

//===--------------------------------------------------------------------===//
  // Provided for performance analysis.
  //===--------------------------------------------------------------------===//

/// The kind of memory backing used to support the MemoryBuffer.
  enum BufferKind {
    MemoryBuffer_Malloc,
    MemoryBuffer_MMap
  };

/// Return information on the memory mechanism used to support the
  /// MemoryBuffer.
  virtual BufferKind getBufferKind() const = 0;

MemoryBufferRef getMemBufferRef() const;
};

/// This class is an extension of MemoryBuffer, which allows copy-on-write
/// access to the underlying contents.  It only supports creation methods that
/// are guaranteed to produce a writable buffer.  For example, mapping a file
/// read-only is not supported.
class WritableMemoryBuffer : public MemoryBuffer {
protected:
  WritableMemoryBuffer() = default;

public:
  using MemoryBuffer::getBuffer;
  using MemoryBuffer::getBufferEnd;
  using MemoryBuffer::getBufferStart;

// const_cast is well-defined here, because the underlying buffer is
  // guaranteed to have been initialized with a mutable buffer.
  char *getBufferStart() {
    return const_cast<char *>(MemoryBuffer::getBufferStart());
  }
  char *getBufferEnd() {
    return const_cast<char *>(MemoryBuffer::getBufferEnd());
  }
  MutableArrayRef<char> getBuffer() {
    return {getBufferStart(), getBufferEnd()};
  }

static ErrorOr<std::unique_ptr<WritableMemoryBuffer>>
  getFile(const Twine &Filename, int64_t FileSize = -1,
          bool IsVolatile = false);

/// Map a subrange of the specified file as a WritableMemoryBuffer.
  static ErrorOr<std::unique_ptr<WritableMemoryBuffer>>
  getFileSlice(const Twine &Filename, uint64_t MapSize, uint64_t Offset,
               bool IsVolatile = false);

/// Allocate a new MemoryBuffer of the specified size that is not initialized.
  /// Note that the caller should initialize the memory allocated by this
  /// method. The memory is owned by the MemoryBuffer object.
  static std::unique_ptr<WritableMemoryBuffer>
  getNewUninitMemBuffer(size_t Size, const Twine &BufferName = "");

/// Allocate a new zero-initialized MemoryBuffer of the specified size. Note
  /// that the caller need not initialize the memory allocated by this method.
  /// The memory is owned by the MemoryBuffer object.
  static std::unique_ptr<WritableMemoryBuffer>
  getNewMemBuffer(size_t Size, const Twine &BufferName = "");

private:
  // Hide these base class factory function so one can't write
  //   WritableMemoryBuffer::getXXX()
  // and be surprised that he got a read-only Buffer.
  using MemoryBuffer::getFileAsStream;
  using MemoryBuffer::getFileOrSTDIN;
  using MemoryBuffer::getMemBuffer;
  using MemoryBuffer::getMemBufferCopy;
  using MemoryBuffer::getOpenFile;
  using MemoryBuffer::getOpenFileSlice;
  using MemoryBuffer::getSTDIN;
};

/// This class is an extension of MemoryBuffer, which allows write access to
/// the underlying contents and committing those changes to the original source.
/// It only supports creation methods that are guaranteed to produce a writable
/// buffer.  For example, mapping a file read-only is not supported.
class WriteThroughMemoryBuffer : public MemoryBuffer {
protected:
  WriteThroughMemoryBuffer() = default;

public:
  using MemoryBuffer::getBuffer;
  using MemoryBuffer::getBufferEnd;
  using MemoryBuffer::getBufferStart;

static ErrorOr<std::unique_ptr<WriteThroughMemoryBuffer>>
  getFile(const Twine &Filename, int64_t FileSize = -1);

/// Map a subrange of the specified file as a ReadWriteMemoryBuffer.
  static ErrorOr<std::unique_ptr<WriteThroughMemoryBuffer>>
  getFileSlice(const Twine &Filename, uint64_t MapSize, uint64_t Offset);

class MemoryBufferRef {
  StringRef Buffer;
  StringRef Identifier;

public:
  MemoryBufferRef() = default;
  MemoryBufferRef(const MemoryBuffer& Buffer)
      : Buffer(Buffer.getBuffer()), Identifier(Buffer.getBufferIdentifier()) {}
  MemoryBufferRef(StringRef Buffer, StringRef Identifier)
      : Buffer(Buffer), Identifier(Identifier) {}

StringRef getBuffer() const { return Buffer; }

StringRef getBufferIdentifier() const { return Identifier; }

const char *getBufferStart() const { return Buffer.begin(); }
  const char *getBufferEnd() const { return Buffer.end(); }
  size_t getBufferSize() const { return Buffer.size(); }
};

// Create wrappers for C Binding types (see CBindingWrapping.h).
DEFINE_SIMPLE_CONVERSION_FUNCTIONS(MemoryBuffer, LLVMMemoryBufferRef)

} // end namespace llvm

#endif // LLVM_SUPPORT_MEMORYBUFFER_H

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Editing: MemoryBuffer.h

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