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//===- TpiStream.cpp - PDB Type Info (TPI) Stream 2 Access ----------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/DebugInfo/PDB/Raw/TpiStream.h"
#include "llvm/DebugInfo/CodeView/CodeView.h"
#include "llvm/DebugInfo/CodeView/StreamReader.h"
#include "llvm/DebugInfo/CodeView/TypeIndex.h"
#include "llvm/DebugInfo/CodeView/TypeRecord.h"
#include "llvm/DebugInfo/PDB/Raw/IndexedStreamData.h"
#include "llvm/DebugInfo/PDB/Raw/MappedBlockStream.h"
#include "llvm/DebugInfo/PDB/Raw/PDBFile.h"
#include "llvm/DebugInfo/PDB/Raw/RawConstants.h"
#include "llvm/DebugInfo/PDB/Raw/RawError.h"
#include "llvm/DebugInfo/PDB/Raw/RawTypes.h"
#include "llvm/Support/Endian.h"
using namespace llvm;
using namespace llvm::support;
using namespace llvm::pdb;
namespace {
const uint32_t MinHashBuckets = 0x1000;
const uint32_t MaxHashBuckets = 0x40000;
}
static uint32_t HashBufferV8(uint8_t *buffer, uint32_t NumBuckets) {
// Not yet implemented, this is probably some variation of CRC32 but we need
// to be sure of the precise implementation otherwise we won't be able to work
// with persisted hash values.
return 0;
}
// This corresponds to `HDR` in PDB/dbi/tpi.h.
struct TpiStream::HeaderInfo {
struct EmbeddedBuf {
little32_t Off;
ulittle32_t Length;
};
ulittle32_t Version;
ulittle32_t HeaderSize;
ulittle32_t TypeIndexBegin;
ulittle32_t TypeIndexEnd;
ulittle32_t TypeRecordBytes;
// The following members correspond to `TpiHash` in PDB/dbi/tpi.h.
ulittle16_t HashStreamIndex;
ulittle16_t HashAuxStreamIndex;
ulittle32_t HashKeySize;
ulittle32_t NumHashBuckets;
EmbeddedBuf HashValueBuffer;
EmbeddedBuf IndexOffsetBuffer;
EmbeddedBuf HashAdjBuffer;
};
TpiStream::TpiStream(const PDBFile &File,
std::unique_ptr<MappedBlockStream> Stream)
: Pdb(File), Stream(std::move(Stream)), HashFunction(nullptr) {}
TpiStream::~TpiStream() {}
Error TpiStream::reload() {
codeview::StreamReader Reader(*Stream);
if (Reader.bytesRemaining() < sizeof(HeaderInfo))
return make_error<RawError>(raw_error_code::corrupt_file,
"TPI Stream does not contain a header.");
if (Reader.readObject(Header))
return make_error<RawError>(raw_error_code::corrupt_file,
"TPI Stream does not contain a header.");
if (Header->Version != PdbTpiV80)
return make_error<RawError>(raw_error_code::corrupt_file,
"Unsupported TPI Version.");
if (Header->HeaderSize != sizeof(HeaderInfo))
return make_error<RawError>(raw_error_code::corrupt_file,
"Corrupt TPI Header size.");
if (Header->HashKeySize != sizeof(ulittle32_t))
return make_error<RawError>(raw_error_code::corrupt_file,
"TPI Stream expected 4 byte hash key size.");
if (Header->NumHashBuckets < MinHashBuckets ||
Header->NumHashBuckets > MaxHashBuckets)
return make_error<RawError>(raw_error_code::corrupt_file,
"TPI Stream Invalid number of hash buckets.");
HashFunction = HashBufferV8;
// The actual type records themselves come from this stream
if (auto EC = Reader.readArray(TypeRecords, Header->TypeRecordBytes))
return EC;
// Hash indices, hash values, etc come from the hash stream.
if (Header->HashStreamIndex >= Pdb.getNumStreams())
return make_error<RawError>(raw_error_code::corrupt_file,
"Invalid TPI hash stream index.");
auto HS =
MappedBlockStream::createIndexedStream(Header->HashStreamIndex, Pdb);
if (!HS)
return HS.takeError();
codeview::StreamReader HSR(**HS);
uint32_t NumHashValues = Header->HashValueBuffer.Length / sizeof(ulittle32_t);
if (NumHashValues != NumTypeRecords())
return make_error<RawError>(
raw_error_code::corrupt_file,
"TPI hash count does not match with the number of type records.");
HSR.setOffset(Header->HashValueBuffer.Off);
if (auto EC = HSR.readArray(HashValues, NumHashValues))
return EC;
HSR.setOffset(Header->IndexOffsetBuffer.Off);
uint32_t NumTypeIndexOffsets =
Header->IndexOffsetBuffer.Length / sizeof(TypeIndexOffset);
if (auto EC = HSR.readArray(TypeIndexOffsets, NumTypeIndexOffsets))
return EC;
HSR.setOffset(Header->HashAdjBuffer.Off);
uint32_t NumHashAdjustments =
Header->HashAdjBuffer.Length / sizeof(TypeIndexOffset);
if (auto EC = HSR.readArray(HashAdjustments, NumHashAdjustments))
return EC;
HashStream = std::move(*HS);
return Error::success();
}
PdbRaw_TpiVer TpiStream::getTpiVersion() const {
uint32_t Value = Header->Version;
return static_cast<PdbRaw_TpiVer>(Value);
}
uint32_t TpiStream::TypeIndexBegin() const { return Header->TypeIndexBegin; }
uint32_t TpiStream::TypeIndexEnd() const { return Header->TypeIndexEnd; }
uint32_t TpiStream::NumTypeRecords() const {
return TypeIndexEnd() - TypeIndexBegin();
}
uint16_t TpiStream::getTypeHashStreamIndex() const {
return Header->HashStreamIndex;
}
uint16_t TpiStream::getTypeHashStreamAuxIndex() const {
return Header->HashAuxStreamIndex;
}
uint32_t TpiStream::NumHashBuckets() const { return Header->NumHashBuckets; }
uint32_t TpiStream::getHashKeySize() const { return Header->HashKeySize; }
codeview::FixedStreamArray<support::ulittle32_t>
TpiStream::getHashValues() const {
return HashValues;
}
codeview::FixedStreamArray<TypeIndexOffset>
TpiStream::getTypeIndexOffsets() const {
return TypeIndexOffsets;
}
codeview::FixedStreamArray<TypeIndexOffset>
TpiStream::getHashAdjustments() const {
return HashAdjustments;
}
iterator_range<codeview::CVTypeArray::Iterator>
TpiStream::types(bool *HadError) const {
return llvm::make_range(TypeRecords.begin(HadError), TypeRecords.end());
}
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