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//===- TpiStreamBuilder.cpp - -------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/DebugInfo/CodeView/TypeIndex.h"
#include "llvm/DebugInfo/CodeView/TypeRecord.h"
#include "llvm/DebugInfo/MSF/ByteStream.h"
#include "llvm/DebugInfo/MSF/MSFBuilder.h"
#include "llvm/DebugInfo/MSF/MappedBlockStream.h"
#include "llvm/DebugInfo/MSF/StreamArray.h"
#include "llvm/DebugInfo/MSF/StreamReader.h"
#include "llvm/DebugInfo/MSF/StreamWriter.h"
#include "llvm/DebugInfo/PDB/Raw/PDBFile.h"
#include "llvm/DebugInfo/PDB/Raw/RawError.h"
#include "llvm/DebugInfo/PDB/Raw/RawTypes.h"
#include "llvm/DebugInfo/PDB/Raw/TpiStream.h"
#include "llvm/DebugInfo/PDB/Raw/TpiStreamBuilder.h"
#include "llvm/Support/Allocator.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/Error.h"
#include <algorithm>
#include <cstdint>
using namespace llvm;
using namespace llvm::msf;
using namespace llvm::pdb;
using namespace llvm::support;
TpiStreamBuilder::TpiStreamBuilder(MSFBuilder &Msf, uint32_t StreamIdx)
: Msf(Msf), Allocator(Msf.getAllocator()), Header(nullptr), Idx(StreamIdx) {
}
TpiStreamBuilder::~TpiStreamBuilder() = default;
void TpiStreamBuilder::setVersionHeader(PdbRaw_TpiVer Version) {
VerHeader = Version;
}
void TpiStreamBuilder::addTypeRecord(const codeview::CVType &Record) {
TypeRecords.push_back(Record);
TypeRecordStream.setItems(TypeRecords);
}
Error TpiStreamBuilder::finalize() {
if (Header)
return Error::success();
TpiStreamHeader *H = Allocator.Allocate<TpiStreamHeader>();
uint32_t Count = TypeRecords.size();
uint32_t HashBufferSize = calculateHashBufferSize();
H->Version = *VerHeader;
H->HeaderSize = sizeof(TpiStreamHeader);
H->TypeIndexBegin = codeview::TypeIndex::FirstNonSimpleIndex;
H->TypeIndexEnd = H->TypeIndexBegin + Count;
H->TypeRecordBytes = TypeRecordStream.getLength();
H->HashStreamIndex = HashStreamIndex;
H->HashAuxStreamIndex = kInvalidStreamIndex;
H->HashKeySize = sizeof(ulittle32_t);
H->NumHashBuckets = MinTpiHashBuckets;
// Recall that hash values go into a completely different stream identified by
// the `HashStreamIndex` field of the `TpiStreamHeader`. Therefore, the data
// begins at offset 0 of this independent stream.
H->HashValueBuffer.Off = 0;
H->HashValueBuffer.Length = HashBufferSize;
H->HashAdjBuffer.Off = H->HashValueBuffer.Off + H->HashValueBuffer.Length;
H->HashAdjBuffer.Length = 0;
H->IndexOffsetBuffer.Off = H->HashAdjBuffer.Off + H->HashAdjBuffer.Length;
H->IndexOffsetBuffer.Length = 0;
Header = H;
return Error::success();
}
uint32_t TpiStreamBuilder::calculateSerializedLength() const {
return sizeof(TpiStreamHeader) + TypeRecordStream.getLength();
}
uint32_t TpiStreamBuilder::calculateHashBufferSize() const {
if (TypeRecords.empty() || !TypeRecords[0].Hash.hasValue())
return 0;
return TypeRecords.size() * sizeof(ulittle32_t);
}
Error TpiStreamBuilder::finalizeMsfLayout() {
uint32_t Length = calculateSerializedLength();
if (auto EC = Msf.setStreamSize(Idx, Length))
return EC;
uint32_t HashBufferSize = calculateHashBufferSize();
if (HashBufferSize == 0)
return Error::success();
auto ExpectedIndex = Msf.addStream(HashBufferSize);
if (!ExpectedIndex)
return ExpectedIndex.takeError();
HashStreamIndex = *ExpectedIndex;
ulittle32_t *H = Allocator.Allocate<ulittle32_t>(TypeRecords.size());
MutableArrayRef<ulittle32_t> HashBuffer(H, TypeRecords.size());
for (uint32_t I = 0; I < TypeRecords.size(); ++I) {
HashBuffer[I] = *TypeRecords[I].Hash % MinTpiHashBuckets;
}
ArrayRef<uint8_t> Bytes(reinterpret_cast<const uint8_t *>(HashBuffer.data()),
HashBufferSize);
HashValueStream = llvm::make_unique<ByteStream>(Bytes);
return Error::success();
}
Error TpiStreamBuilder::commit(const msf::MSFLayout &Layout,
const msf::WritableStream &Buffer) {
if (auto EC = finalize())
return EC;
auto InfoS =
WritableMappedBlockStream::createIndexedStream(Layout, Buffer, Idx);
StreamWriter Writer(*InfoS);
if (auto EC = Writer.writeObject(*Header))
return EC;
auto RecordArray = VarStreamArray<codeview::CVType>(TypeRecordStream);
if (auto EC = Writer.writeArray(RecordArray))
return EC;
if (HashStreamIndex != kInvalidStreamIndex) {
auto HVS = WritableMappedBlockStream::createIndexedStream(Layout, Buffer,
HashStreamIndex);
StreamWriter HW(*HVS);
if (auto EC = HW.writeStreamRef(*HashValueStream))
return EC;
}
return Error::success();
}
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