1 //===- NamedStreamMap.cpp - PDB Named Stream Map --------------------------===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 #include "llvm/DebugInfo/PDB/Native/NamedStreamMap.h"
10 #include "llvm/ADT/SparseBitVector.h"
11 #include "llvm/ADT/StringMap.h"
12 #include "llvm/ADT/StringRef.h"
13 #include "llvm/DebugInfo/PDB/Native/Hash.h"
14 #include "llvm/DebugInfo/PDB/Native/HashTable.h"
15 #include "llvm/DebugInfo/PDB/Native/RawError.h"
16 #include "llvm/Support/BinaryStreamReader.h"
17 #include "llvm/Support/BinaryStreamWriter.h"
18 #include "llvm/Support/Endian.h"
19 #include "llvm/Support/Error.h"
25 using namespace llvm::pdb;
27 NamedStreamMapTraits::NamedStreamMapTraits(NamedStreamMap &NS) : NS(&NS) {}
29 uint16_t NamedStreamMapTraits::hashLookupKey(StringRef S) const {
30 // In the reference implementation, this uses
31 // HASH Hasher<ULONG*, USHORT*>::hashPbCb(PB pb, size_t cb, ULONG ulMod).
32 // Here, the type HASH is a typedef of unsigned short.
33 // ** It is not a bug that we truncate the result of hashStringV1, in fact
34 // it is a bug if we do not! **
35 // See NMTNI::hash() in the reference implementation.
36 return static_cast<uint16_t>(hashStringV1(S));
39 StringRef NamedStreamMapTraits::storageKeyToLookupKey(uint32_t Offset) const {
40 return NS->getString(Offset);
43 uint32_t NamedStreamMapTraits::lookupKeyToStorageKey(StringRef S) {
44 return NS->appendStringData(S);
47 NamedStreamMap::NamedStreamMap() : HashTraits(*this), OffsetIndexMap(1) {}
49 Error NamedStreamMap::load(BinaryStreamReader &Stream) {
50 uint32_t StringBufferSize;
51 if (auto EC = Stream.readInteger(StringBufferSize))
52 return joinErrors(std::move(EC),
53 make_error<RawError>(raw_error_code::corrupt_file,
54 "Expected string buffer size"));
57 if (auto EC = Stream.readFixedString(Buffer, StringBufferSize))
59 NamesBuffer.assign(Buffer.begin(), Buffer.end());
61 return OffsetIndexMap.load(Stream);
64 Error NamedStreamMap::commit(BinaryStreamWriter &Writer) const {
65 // The first field is the number of bytes of string data.
66 if (auto EC = Writer.writeInteger<uint32_t>(NamesBuffer.size()))
69 // Then the actual string data.
70 StringRef Data(NamesBuffer.data(), NamesBuffer.size());
71 if (auto EC = Writer.writeFixedString(Data))
74 // And finally the Offset Index map.
75 if (auto EC = OffsetIndexMap.commit(Writer))
78 return Error::success();
81 uint32_t NamedStreamMap::calculateSerializedLength() const {
82 return sizeof(uint32_t) // String data size
83 + NamesBuffer.size() // String data
84 + OffsetIndexMap.calculateSerializedLength(); // Offset Index Map
87 uint32_t NamedStreamMap::size() const { return OffsetIndexMap.size(); }
89 StringRef NamedStreamMap::getString(uint32_t Offset) const {
90 assert(NamesBuffer.size() > Offset);
91 return StringRef(NamesBuffer.data() + Offset);
94 uint32_t NamedStreamMap::hashString(uint32_t Offset) const {
95 return hashStringV1(getString(Offset));
98 bool NamedStreamMap::get(StringRef Stream, uint32_t &StreamNo) const {
99 auto Iter = OffsetIndexMap.find_as(Stream, HashTraits);
100 if (Iter == OffsetIndexMap.end())
102 StreamNo = (*Iter).second;
106 StringMap<uint32_t> NamedStreamMap::entries() const {
107 StringMap<uint32_t> Result;
108 for (const auto &Entry : OffsetIndexMap) {
109 StringRef Stream(NamesBuffer.data() + Entry.first);
110 Result.try_emplace(Stream, Entry.second);
115 uint32_t NamedStreamMap::appendStringData(StringRef S) {
116 uint32_t Offset = NamesBuffer.size();
117 llvm::append_range(NamesBuffer, S);
118 NamesBuffer.push_back('\0');
122 void NamedStreamMap::set(StringRef Stream, uint32_t StreamNo) {
123 OffsetIndexMap.set_as(Stream, support::ulittle32_t(StreamNo), HashTraits);