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//===- NamedStreamMap.cpp - PDB Named Stream Map --------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/DebugInfo/PDB/Native/NamedStreamMap.h"
#include "llvm/ADT/SparseBitVector.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/DebugInfo/PDB/Native/Hash.h"
#include "llvm/DebugInfo/PDB/Native/HashTable.h"
#include "llvm/DebugInfo/PDB/Native/RawError.h"
#include "llvm/Support/BinaryStreamReader.h"
#include "llvm/Support/BinaryStreamWriter.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/Error.h"
#include <algorithm>
#include <cassert>
#include <cstdint>
using namespace llvm;
using namespace llvm::pdb;
NamedStreamMapTraits::NamedStreamMapTraits(NamedStreamMap &NS) : NS(&NS) {}
uint16_t NamedStreamMapTraits::hashLookupKey(StringRef S) const {
// In the reference implementation, this uses
// HASH Hasher<ULONG*, USHORT*>::hashPbCb(PB pb, size_t cb, ULONG ulMod).
// Here, the type HASH is a typedef of unsigned short.
// ** It is not a bug that we truncate the result of hashStringV1, in fact
// it is a bug if we do not! **
// See NMTNI::hash() in the reference implementation.
return static_cast<uint16_t>(hashStringV1(S));
}
StringRef NamedStreamMapTraits::storageKeyToLookupKey(uint32_t Offset) const {
return NS->getString(Offset);
}
uint32_t NamedStreamMapTraits::lookupKeyToStorageKey(StringRef S) {
return NS->appendStringData(S);
}
NamedStreamMap::NamedStreamMap() : HashTraits(*this), OffsetIndexMap(1) {}
Error NamedStreamMap::load(BinaryStreamReader &Stream) {
uint32_t StringBufferSize;
if (auto EC = Stream.readInteger(StringBufferSize))
return joinErrors(std::move(EC),
make_error<RawError>(raw_error_code::corrupt_file,
"Expected string buffer size"));
StringRef Buffer;
if (auto EC = Stream.readFixedString(Buffer, StringBufferSize))
return EC;
NamesBuffer.assign(Buffer.begin(), Buffer.end());
return OffsetIndexMap.load(Stream);
}
Error NamedStreamMap::commit(BinaryStreamWriter &Writer) const {
// The first field is the number of bytes of string data.
if (auto EC = Writer.writeInteger<uint32_t>(NamesBuffer.size()))
return EC;
// Then the actual string data.
StringRef Data(NamesBuffer.data(), NamesBuffer.size());
if (auto EC = Writer.writeFixedString(Data))
return EC;
// And finally the Offset Index map.
if (auto EC = OffsetIndexMap.commit(Writer))
return EC;
return Error::success();
}
uint32_t NamedStreamMap::calculateSerializedLength() const {
return sizeof(uint32_t) // String data size
+ NamesBuffer.size() // String data
+ OffsetIndexMap.calculateSerializedLength(); // Offset Index Map
}
uint32_t NamedStreamMap::size() const { return OffsetIndexMap.size(); }
StringRef NamedStreamMap::getString(uint32_t Offset) const {
assert(NamesBuffer.size() > Offset);
return StringRef(NamesBuffer.data() + Offset);
}
uint32_t NamedStreamMap::hashString(uint32_t Offset) const {
return hashStringV1(getString(Offset));
}
bool NamedStreamMap::get(StringRef Stream, uint32_t &StreamNo) const {
auto Iter = OffsetIndexMap.find_as(Stream, HashTraits);
if (Iter == OffsetIndexMap.end())
return false;
StreamNo = (*Iter).second;
return true;
}
StringMap<uint32_t> NamedStreamMap::entries() const {
StringMap<uint32_t> Result;
for (const auto &Entry : OffsetIndexMap) {
StringRef Stream(NamesBuffer.data() + Entry.first);
Result.try_emplace(Stream, Entry.second);
}
return Result;
}
uint32_t NamedStreamMap::appendStringData(StringRef S) {
uint32_t Offset = NamesBuffer.size();
llvm::append_range(NamesBuffer, S);
NamesBuffer.push_back('\0');
return Offset;
}
void NamedStreamMap::set(StringRef Stream, uint32_t StreamNo) {
OffsetIndexMap.set_as(Stream, support::ulittle32_t(StreamNo), HashTraits);
}
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