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

   1 //===- InfoStream.cpp - PDB Info Stream (Stream 1) Access -------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #include "llvm/DebugInfo/PDB/Native/InfoStream.h"
  11 #include "llvm/ADT/BitVector.h"
  12 #include "llvm/ADT/SmallVector.h"
  13 #include "llvm/DebugInfo/PDB/Native/PDBFile.h"
  14 #include "llvm/DebugInfo/PDB/Native/RawConstants.h"
  15 #include "llvm/DebugInfo/PDB/Native/RawError.h"
  16 #include "llvm/DebugInfo/PDB/Native/RawTypes.h"
  17 #include "llvm/Support/BinaryStreamReader.h"
  18 #include "llvm/Support/BinaryStreamWriter.h"
  19
  20 using namespace llvm;
  21 using namespace llvm::codeview;
  22 using namespace llvm::msf;
  23 using namespace llvm::pdb;
  24
  25 InfoStream::InfoStream(std::unique_ptr<MappedBlockStream> Stream)
  26     : Stream(std::move(Stream)) {}
  27
  28 Error InfoStream::reload() {
  29   BinaryStreamReader Reader(*Stream);
  30
  31   const InfoStreamHeader *H;
  32   if (auto EC = Reader.readObject(H))
  33     return joinErrors(
  34         std::move(EC),
  35         make_error<RawError>(raw_error_code::corrupt_file,
  36                              "PDB Stream does not contain a header."));
  37
  38   switch (H->Version) {
  39   case PdbImplVC70:
  40   case PdbImplVC80:
  41   case PdbImplVC110:
  42   case PdbImplVC140:
  43     break;
  44   default:
  45     return make_error<RawError>(raw_error_code::corrupt_file,
  46                                 "Unsupported PDB stream version.");
  47   }
  48
  49   Version = H->Version;
  50   Signature = H->Signature;
  51   Age = H->Age;
  52   Guid = H->Guid;
  53
  54   uint32_t Offset = Reader.getOffset();
  55   if (auto EC = NamedStreams.load(Reader))
  56     return EC;
  57   uint32_t NewOffset = Reader.getOffset();
  58   NamedStreamMapByteSize = NewOffset - Offset;
  59
  60   bool Stop = false;
  61   while (!Stop && !Reader.empty()) {
  62     PdbRaw_FeatureSig Sig;
  63     if (auto EC = Reader.readEnum(Sig))
  64       return EC;
  65     // Since this value comes from a file, it's possible we have some strange
  66     // value which doesn't correspond to any value.  We don't want to warn on
  67     // -Wcovered-switch-default in this case, so switch on the integral value
  68     // instead of the enumeration value.
  69     switch (uint32_t(Sig)) {
  70     case uint32_t(PdbRaw_FeatureSig::VC110):
  71       // No other flags for VC110 PDB.
  72       Stop = true;
  73       LLVM_FALLTHROUGH;
  74     case uint32_t(PdbRaw_FeatureSig::VC140):
  75       Features |= PdbFeatureContainsIdStream;
  76       break;
  77     case uint32_t(PdbRaw_FeatureSig::NoTypeMerge):
  78       Features |= PdbFeatureNoTypeMerging;
  79       break;
  80     case uint32_t(PdbRaw_FeatureSig::MinimalDebugInfo):
  81       Features |= PdbFeatureMinimalDebugInfo;
  82     default:
  83       continue;
  84     }
  85     FeatureSignatures.push_back(Sig);
  86   }
  87   return Error::success();
  88 }
  89
  90 uint32_t InfoStream::getStreamSize() const { return Stream->getLength(); }
  91
  92 uint32_t InfoStream::getNamedStreamIndex(llvm::StringRef Name) const {
  93   uint32_t Result;
  94   if (!NamedStreams.get(Name, Result))
  95     return 0;
  96   return Result;
  97 }
  98
  99 iterator_range<StringMapConstIterator<uint32_t>>
 100 InfoStream::named_streams() const {
 101   return NamedStreams.entries();
 102 }
 103
 104 PdbRaw_ImplVer InfoStream::getVersion() const {
 105   return static_cast<PdbRaw_ImplVer>(Version);
 106 }
 107
 108 uint32_t InfoStream::getSignature() const { return Signature; }
 109
 110 uint32_t InfoStream::getAge() const { return Age; }
 111
 112 PDB_UniqueId InfoStream::getGuid() const { return Guid; }
 113
 114 uint32_t InfoStream::getNamedStreamMapByteSize() const {
 115   return NamedStreamMapByteSize;
 116 }
 117
 118 PdbRaw_Features InfoStream::getFeatures() const { return Features; }
 119
 120 ArrayRef<PdbRaw_FeatureSig> InfoStream::getFeatureSignatures() const {
 121   return FeatureSignatures;
 122 }
 123
 124 const NamedStreamMap &InfoStream::getNamedStreams() const {
 125   return NamedStreams;
 126 }