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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: Memory.h

//===- llvm/Support/Memory.h - Memory 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 declares the llvm::sys::Memory class.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_SUPPORT_MEMORY_H
#define LLVM_SUPPORT_MEMORY_H

#include "llvm/Support/DataTypes.h"
#include <string>
#include <system_error>

namespace llvm {

// Forward declare raw_ostream: it is used for debug dumping below.
class raw_ostream;

namespace sys {

/// This class encapsulates the notion of a memory block which has an address
  /// and a size. It is used by the Memory class (a friend) as the result of
  /// various memory allocation operations.
  /// @see Memory
  /// Memory block abstraction.
  class MemoryBlock {
  public:
    MemoryBlock() : Address(nullptr), AllocatedSize(0) {}
    MemoryBlock(void *addr, size_t allocatedSize)
        : Address(addr), AllocatedSize(allocatedSize) {}
    void *base() const { return Address; }
    /// The size as it was allocated. This is always greater or equal to the
    /// size that was originally requested.
    size_t allocatedSize() const { return AllocatedSize; }
  
  private:
    void *Address;    ///< Address of first byte of memory area
    size_t AllocatedSize; ///< Size, in bytes of the memory area
    unsigned Flags = 0;
    friend class Memory;
  };

/// This class provides various memory handling functions that manipulate
  /// MemoryBlock instances.
  /// @since 1.4
  /// An abstraction for memory operations.
  class Memory {
  public:
    enum ProtectionFlags {
      MF_READ = 0x1000000,
      MF_WRITE = 0x2000000,
      MF_EXEC = 0x4000000,
      MF_RWE_MASK = 0x7000000,

/// The \p MF_HUGE_HINT flag is used to indicate that the request for
      /// a memory block should be satisfied with large pages if possible.
      /// This is only a hint and small pages will be used as fallback.
      ///
      /// The presence or absence of this flag in the returned memory block
      /// is (at least currently) *not* a reliable indicator that the memory
      /// block will use or will not use large pages. On some systems a request
      /// without this flag can be backed by large pages without this flag being
      /// set, and on some other systems a request with this flag can fallback
      /// to small pages without this flag being cleared.
      MF_HUGE_HINT = 0x0000001
    };

/// This method allocates a block of memory that is suitable for loading
    /// dynamically generated code (e.g. JIT). An attempt to allocate
    /// \p NumBytes bytes of virtual memory is made.
    /// \p NearBlock may point to an existing allocation in which case
    /// an attempt is made to allocate more memory near the existing block.
    /// The actual allocated address is not guaranteed to be near the requested
    /// address.
    /// \p Flags is used to set the initial protection flags for the block
    /// of the memory.
    /// \p EC [out] returns an object describing any error that occurs.
    ///
    /// This method may allocate more than the number of bytes requested.  The
    /// actual number of bytes allocated is indicated in the returned
    /// MemoryBlock.
    ///
    /// The start of the allocated block must be aligned with the
    /// system allocation granularity (64K on Windows, page size on Linux).
    /// If the address following \p NearBlock is not so aligned, it will be
    /// rounded up to the next allocation granularity boundary.
    ///
    /// \r a non-null MemoryBlock if the function was successful,
    /// otherwise a null MemoryBlock is with \p EC describing the error.
    ///
    /// Allocate mapped memory.
    static MemoryBlock allocateMappedMemory(size_t NumBytes,
                                            const MemoryBlock *const NearBlock,
                                            unsigned Flags,
                                            std::error_code &EC);

/// This method releases a block of memory that was allocated with the
    /// allocateMappedMemory method. It should not be used to release any
    /// memory block allocated any other way.
    /// \p Block describes the memory to be released.
    ///
    /// \r error_success if the function was successful, or an error_code
    /// describing the failure if an error occurred.
    ///
    /// Release mapped memory.
    static std::error_code releaseMappedMemory(MemoryBlock &Block);

/// This method sets the protection flags for a block of memory to the
    /// state specified by /p Flags.  The behavior is not specified if the
    /// memory was not allocated using the allocateMappedMemory method.
    /// \p Block describes the memory block to be protected.
    /// \p Flags specifies the new protection state to be assigned to the block.
    /// \p ErrMsg [out] returns a string describing any error that occurred.
    ///
    /// If \p Flags is MF_WRITE, the actual behavior varies
    /// with the operating system (i.e. MF_READ | MF_WRITE on Windows) and the
    /// target architecture (i.e. MF_WRITE -> MF_READ | MF_WRITE on i386).
    ///
    /// \r error_success if the function was successful, or an error_code
    /// describing the failure if an error occurred.
    ///
    /// Set memory protection state.
    static std::error_code protectMappedMemory(const MemoryBlock &Block,
                                               unsigned Flags);

/// InvalidateInstructionCache - Before the JIT can run a block of code
    /// that has been emitted it must invalidate the instruction cache on some
    /// platforms.
    static void InvalidateInstructionCache(const void *Addr, size_t Len);
  };

/// Owning version of MemoryBlock.
  class OwningMemoryBlock {
  public:
    OwningMemoryBlock() = default;
    explicit OwningMemoryBlock(MemoryBlock M) : M(M) {}
    OwningMemoryBlock(OwningMemoryBlock &&Other) {
      M = Other.M;
      Other.M = MemoryBlock();
    }
    OwningMemoryBlock& operator=(OwningMemoryBlock &&Other) {
      M = Other.M;
      Other.M = MemoryBlock();
      return *this;
    }
    ~OwningMemoryBlock() {
      Memory::releaseMappedMemory(M);
    }
    void *base() const { return M.base(); }
    /// The size as it was allocated. This is always greater or equal to the
    /// size that was originally requested.
    size_t allocatedSize() const { return M.allocatedSize(); }
    MemoryBlock getMemoryBlock() const { return M; }
  private:
    MemoryBlock M;
  };

#ifndef NDEBUG
  /// Debugging output for Memory::ProtectionFlags.
  raw_ostream &operator<<(raw_ostream &OS, const Memory::ProtectionFlags &PF);

/// Debugging output for MemoryBlock.
  raw_ostream &operator<<(raw_ostream &OS, const MemoryBlock &MB);
#endif // ifndef NDEBUG
  }    // end namespace sys
  }    // end namespace llvm

#endif

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