contrib/llvm-project/llvm/lib/DebugInfo/PDB/Native/InfoStream.cpp

   1 //===- InfoStream.cpp - PDB Info Stream (Stream 1) Access -------*- C++ -*-===//
   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 #include "llvm/DebugInfo/PDB/Native/InfoStream.h"
  10 #include "llvm/ADT/BitVector.h"
  11 #include "llvm/ADT/SmallVector.h"
  12 #include "llvm/DebugInfo/PDB/Native/RawConstants.h"
  13 #include "llvm/DebugInfo/PDB/Native/RawError.h"
  14 #include "llvm/DebugInfo/PDB/Native/RawTypes.h"
  15 #include "llvm/Support/BinaryStreamReader.h"
  16
  17 using namespace llvm;
  18 using namespace llvm::codeview;
  19 using namespace llvm::msf;
  20 using namespace llvm::pdb;
  21
  22 InfoStream::InfoStream(std::unique_ptr<BinaryStream> Stream)
  23     : Stream(std::move(Stream)), Header(nullptr) {}
  24
  25 Error InfoStream::reload() {
  26   BinaryStreamReader Reader(*Stream);
  27
  28   if (auto EC = Reader.readObject(Header))
  29     return joinErrors(
  30         std::move(EC),
  31         make_error<RawError>(raw_error_code::corrupt_file,
  32                              "PDB Stream does not contain a header."));
  33
  34   switch (Header->Version) {
  35   case PdbImplVC70:
  36   case PdbImplVC80:
  37   case PdbImplVC110:
  38   case PdbImplVC140:
  39     break;
  40   default:
  41     return make_error<RawError>(raw_error_code::corrupt_file,
  42                                 "Unsupported PDB stream version.");
  43   }
  44
  45   uint32_t Offset = Reader.getOffset();
  46   if (auto EC = NamedStreams.load(Reader))
  47     return EC;
  48   uint32_t NewOffset = Reader.getOffset();
  49   NamedStreamMapByteSize = NewOffset - Offset;
  50
  51   Reader.setOffset(Offset);
  52   if (auto EC = Reader.readSubstream(SubNamedStreams, NamedStreamMapByteSize))
  53     return EC;
  54
  55   bool Stop = false;
  56   while (!Stop && !Reader.empty()) {
  57     PdbRaw_FeatureSig Sig;
  58     if (auto EC = Reader.readEnum(Sig))
  59       return EC;
  60     // Since this value comes from a file, it's possible we have some strange
  61     // value which doesn't correspond to any value.  We don't want to warn on
  62     // -Wcovered-switch-default in this case, so switch on the integral value
  63     // instead of the enumeration value.
  64     switch (uint32_t(Sig)) {
  65     case uint32_t(PdbRaw_FeatureSig::VC110):
  66       // No other flags for VC110 PDB.
  67       Stop = true;
  68       LLVM_FALLTHROUGH;
  69     case uint32_t(PdbRaw_FeatureSig::VC140):
  70       Features |= PdbFeatureContainsIdStream;
  71       break;
  72     case uint32_t(PdbRaw_FeatureSig::NoTypeMerge):
  73       Features |= PdbFeatureNoTypeMerging;
  74       break;
  75     case uint32_t(PdbRaw_FeatureSig::MinimalDebugInfo):
  76       Features |= PdbFeatureMinimalDebugInfo;
  77       break;
  78     default:
  79       continue;
  80     }
  81     FeatureSignatures.push_back(Sig);
  82   }
  83   return Error::success();
  84 }
  85
  86 uint32_t InfoStream::getStreamSize() const { return Stream->getLength(); }
  87
  88 Expected<uint32_t> InfoStream::getNamedStreamIndex(llvm::StringRef Name) const {
  89   uint32_t Result;
  90   if (!NamedStreams.get(Name, Result))
  91     return make_error<RawError>(raw_error_code::no_stream);
  92   return Result;
  93 }
  94
  95 StringMap<uint32_t> InfoStream::named_streams() const {
  96   return NamedStreams.entries();
  97 }
  98
  99 bool InfoStream::containsIdStream() const {
 100   return !!(Features & PdbFeatureContainsIdStream);
 101 }
 102
 103 PdbRaw_ImplVer InfoStream::getVersion() const {
 104   return static_cast<PdbRaw_ImplVer>(uint32_t(Header->Version));
 105 }
 106
 107 uint32_t InfoStream::getSignature() const {
 108   return uint32_t(Header->Signature);
 109 }
 110
 111 uint32_t InfoStream::getAge() const { return uint32_t(Header->Age); }
 112
 113 GUID InfoStream::getGuid() const { return Header->Guid; }
 114
 115 uint32_t InfoStream::getNamedStreamMapByteSize() const {
 116   return NamedStreamMapByteSize;
 117 }
 118
 119 PdbRaw_Features InfoStream::getFeatures() const { return Features; }
 120
 121 ArrayRef<PdbRaw_FeatureSig> InfoStream::getFeatureSignatures() const {
 122   return FeatureSignatures;
 123 }
 124
 125 const NamedStreamMap &InfoStream::getNamedStreams() const {
 126   return NamedStreams;
 127 }
 128
 129 BinarySubstreamRef InfoStream::getNamedStreamsBuffer() const {
 130   return SubNamedStreams;
 131 }