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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/TypeRecord.h"
#include "llvm/DebugInfo/PDB/Raw/MappedBlockStream.h"
#include "llvm/DebugInfo/PDB/Raw/RawConstants.h"
#include "llvm/DebugInfo/PDB/Raw/StreamReader.h"
#include "llvm/Support/Endian.h"
using namespace llvm;
using namespace llvm::support;
using namespace llvm::pdb;
namespace {
const uint32_t MinTypeIndex = codeview::TypeIndex::FirstNonSimpleIndex;
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;
}
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;
ulittle16_t HashStreamIndex;
ulittle16_t HashAuxStreamIndex;
ulittle32_t HashKeySize;
ulittle32_t NumHashBuckets;
EmbeddedBuf HashValueBuffer;
EmbeddedBuf IndexOffsetBuffer;
EmbeddedBuf HashAdjBuffer;
};
TpiStream::TpiStream(PDBFile &File)
: Pdb(File), Stream(StreamTPI, File), HashFunction(nullptr) {}
TpiStream::~TpiStream() {}
std::error_code TpiStream::reload() {
StreamReader Reader(Stream);
if (Reader.bytesRemaining() < sizeof(HeaderInfo))
return std::make_error_code(std::errc::illegal_byte_sequence);
Header.reset(new HeaderInfo());
Reader.readObject(Header.get());
if (Header->Version != PdbTpiV80)
return std::make_error_code(std::errc::not_supported);
if (Header->HeaderSize != sizeof(HeaderInfo))
return std::make_error_code(std::errc::illegal_byte_sequence);
if (Header->HashKeySize != sizeof(ulittle32_t))
return std::make_error_code(std::errc::illegal_byte_sequence);
if (Header->NumHashBuckets < MinHashBuckets ||
Header->NumHashBuckets > MaxHashBuckets)
return std::make_error_code(std::errc::illegal_byte_sequence);
HashFunction = HashBufferV8;
// The actual type records themselves come from this stream
RecordsBuffer.initialize(Reader, Header->TypeRecordBytes);
TypeRecords.resize(TypeIndexEnd() - ::MinTypeIndex);
StreamReader RecordsReader(RecordsBuffer);
for (uint32_t I = TypeIndexBegin(); I < TypeIndexEnd(); ++I) {
HashedTypeRecord &Record = TypeRecords[I - ::MinTypeIndex];
codeview::TypeRecordPrefix Prefix;
if (auto EC = RecordsReader.readObject(&Prefix))
return EC;
Record.Kind =
static_cast<codeview::TypeLeafKind>(static_cast<uint16_t>(Prefix.Leaf));
// Since we read this entire buffer into a ByteStream, we are guaranteed
// that the entire buffer is contiguous (i.e. there's no longer a chance
// that it splits across a page boundary. So we can request a reference
// directly into the stream buffer to avoid unnecessary memory copies.
uint32_t RecordSize = Prefix.Len - sizeof(Prefix.Leaf);
if (auto EC = RecordsReader.getArrayRef(Record.Record, RecordSize))
return EC;
}
// Hash indices, hash values, etc come from the hash stream.
MappedBlockStream HS(Header->HashStreamIndex, Pdb);
StreamReader HSR(HS);
HSR.setOffset(Header->HashValueBuffer.Off);
HashValuesBuffer.initialize(HSR, Header->HashValueBuffer.Length);
HSR.setOffset(Header->HashAdjBuffer.Off);
HashAdjBuffer.initialize(HSR, Header->HashAdjBuffer.Length);
HSR.setOffset(Header->IndexOffsetBuffer.Off);
TypeIndexOffsetBuffer.initialize(HSR, Header->IndexOffsetBuffer.Length);
return std::error_code();
}
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();
}
ArrayRef<TpiStream::HashedTypeRecord> TpiStream::records() const {
const HashedTypeRecord *Begin =
&TypeRecords[TypeIndexBegin() - ::MinTypeIndex];
return ArrayRef<HashedTypeRecord>(Begin, NumTypeRecords());
}
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