llvm/lib/ObjectYAML/CodeViewYAMLTypeHashing.cpp

   1 //===- CodeViewYAMLTypeHashing.cpp - CodeView YAMLIO type hashing ---------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file defines classes for handling the YAML representation of CodeView
  10 // Debug Info.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/ObjectYAML/CodeViewYAMLTypeHashing.h"
  15
  16 #include "llvm/BinaryFormat/COFF.h"
  17 #include "llvm/Support/BinaryByteStream.h"
  18 #include "llvm/Support/BinaryStreamReader.h"
  19 #include "llvm/Support/BinaryStreamWriter.h"
  20
  21 using namespace llvm;
  22 using namespace llvm::codeview;
  23 using namespace llvm::CodeViewYAML;
  24 using namespace llvm::yaml;
  25
  26 namespace llvm {
  27 namespace yaml {
  28
  29 void MappingTraits<DebugHSection>::mapping(IO &io, DebugHSection &DebugH) {
  30   io.mapRequired("Version", DebugH.Version);
  31   io.mapRequired("HashAlgorithm", DebugH.HashAlgorithm);
  32   io.mapOptional("HashValues", DebugH.Hashes);
  33 }
  34
  35 void ScalarTraits<GlobalHash>::output(const GlobalHash &GH, void *Ctx,
  36                                       raw_ostream &OS) {
  37   ScalarTraits<BinaryRef>::output(GH.Hash, Ctx, OS);
  38 }
  39
  40 StringRef ScalarTraits<GlobalHash>::input(StringRef Scalar, void *Ctx,
  41                                           GlobalHash &GH) {
  42   return ScalarTraits<BinaryRef>::input(Scalar, Ctx, GH.Hash);
  43 }
  44
  45 } // end namespace yaml
  46 } // end namespace llvm
  47
  48 DebugHSection llvm::CodeViewYAML::fromDebugH(ArrayRef<uint8_t> DebugH) {
  49   assert(DebugH.size() >= 8);
  50   assert((DebugH.size() - 8) % 8 == 0);
  51
  52   BinaryStreamReader Reader(DebugH, llvm::endianness::little);
  53   DebugHSection DHS;
  54   cantFail(Reader.readInteger(DHS.Magic));
  55   cantFail(Reader.readInteger(DHS.Version));
  56   cantFail(Reader.readInteger(DHS.HashAlgorithm));
  57
  58   while (Reader.bytesRemaining() != 0) {
  59     ArrayRef<uint8_t> S;
  60     cantFail(Reader.readBytes(S, 8));
  61     DHS.Hashes.emplace_back(S);
  62   }
  63   assert(Reader.bytesRemaining() == 0);
  64   return DHS;
  65 }
  66
  67 ArrayRef<uint8_t> llvm::CodeViewYAML::toDebugH(const DebugHSection &DebugH,
  68                                                BumpPtrAllocator &Alloc) {
  69   uint32_t Size = 8 + 8 * DebugH.Hashes.size();
  70   uint8_t *Data = Alloc.Allocate<uint8_t>(Size);
  71   MutableArrayRef<uint8_t> Buffer(Data, Size);
  72   BinaryStreamWriter Writer(Buffer, llvm::endianness::little);
  73
  74   cantFail(Writer.writeInteger(DebugH.Magic));
  75   cantFail(Writer.writeInteger(DebugH.Version));
  76   cantFail(Writer.writeInteger(DebugH.HashAlgorithm));
  77   SmallString<8> Hash;
  78   for (const auto &H : DebugH.Hashes) {
  79     Hash.clear();
  80     raw_svector_ostream OS(Hash);
  81     H.Hash.writeAsBinary(OS);
  82     assert((Hash.size() == 8) && "Invalid hash size!");
  83     cantFail(Writer.writeFixedString(Hash));
  84   }
  85   assert(Writer.bytesRemaining() == 0);
  86   return Buffer;
  87 }