1 //===- PDBStringTable.cpp - PDB String Table ---------------------*- C++-*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "llvm/DebugInfo/PDB/Native/PDBStringTable.h"
12 #include "llvm/ADT/ArrayRef.h"
13 #include "llvm/DebugInfo/PDB/Native/Hash.h"
14 #include "llvm/DebugInfo/PDB/Native/RawError.h"
15 #include "llvm/DebugInfo/PDB/Native/RawTypes.h"
16 #include "llvm/Support/BinaryStreamReader.h"
17 #include "llvm/Support/Endian.h"
20 using namespace llvm::support;
21 using namespace llvm::pdb;
23 uint32_t PDBStringTable::getByteSize() const { return Header->ByteSize; }
24 uint32_t PDBStringTable::getNameCount() const { return NameCount; }
25 uint32_t PDBStringTable::getHashVersion() const { return Header->HashVersion; }
26 uint32_t PDBStringTable::getSignature() const { return Header->Signature; }
28 Error PDBStringTable::readHeader(BinaryStreamReader &Reader) {
29 if (auto EC = Reader.readObject(Header))
32 if (Header->Signature != PDBStringTableSignature)
33 return make_error<RawError>(raw_error_code::corrupt_file,
34 "Invalid hash table signature");
35 if (Header->HashVersion != 1 && Header->HashVersion != 2)
36 return make_error<RawError>(raw_error_code::corrupt_file,
37 "Unsupported hash version");
39 assert(Reader.bytesRemaining() == 0);
40 return Error::success();
43 Error PDBStringTable::readStrings(BinaryStreamReader &Reader) {
44 BinaryStreamRef Stream;
45 if (auto EC = Reader.readStreamRef(Stream))
48 if (auto EC = Strings.initialize(Stream)) {
49 return joinErrors(std::move(EC),
50 make_error<RawError>(raw_error_code::corrupt_file,
51 "Invalid hash table byte length"));
54 assert(Reader.bytesRemaining() == 0);
55 return Error::success();
58 const codeview::DebugStringTableSubsectionRef &
59 PDBStringTable::getStringTable() const {
63 Error PDBStringTable::readHashTable(BinaryStreamReader &Reader) {
64 const support::ulittle32_t *HashCount;
65 if (auto EC = Reader.readObject(HashCount))
68 if (auto EC = Reader.readArray(IDs, *HashCount)) {
69 return joinErrors(std::move(EC),
70 make_error<RawError>(raw_error_code::corrupt_file,
71 "Could not read bucket array"));
74 return Error::success();
77 Error PDBStringTable::readEpilogue(BinaryStreamReader &Reader) {
78 if (auto EC = Reader.readInteger(NameCount))
81 assert(Reader.bytesRemaining() == 0);
82 return Error::success();
85 Error PDBStringTable::reload(BinaryStreamReader &Reader) {
87 BinaryStreamReader SectionReader;
89 std::tie(SectionReader, Reader) = Reader.split(sizeof(PDBStringTableHeader));
90 if (auto EC = readHeader(SectionReader))
93 std::tie(SectionReader, Reader) = Reader.split(Header->ByteSize);
94 if (auto EC = readStrings(SectionReader))
97 // We don't know how long the hash table is until we parse it, so let the
98 // function responsible for doing that figure it out.
99 if (auto EC = readHashTable(Reader))
102 std::tie(SectionReader, Reader) = Reader.split(sizeof(uint32_t));
103 if (auto EC = readEpilogue(SectionReader))
106 assert(Reader.bytesRemaining() == 0);
107 return Error::success();
110 Expected<StringRef> PDBStringTable::getStringForID(uint32_t ID) const {
111 return Strings.getString(ID);
114 Expected<uint32_t> PDBStringTable::getIDForString(StringRef Str) const {
116 (Header->HashVersion == 1) ? hashStringV1(Str) : hashStringV2(Str);
117 size_t Count = IDs.size();
118 uint32_t Start = Hash % Count;
119 for (size_t I = 0; I < Count; ++I) {
120 // The hash is just a starting point for the search, but if it
121 // doesn't work we should find the string no matter what, because
122 // we iterate the entire array.
123 uint32_t Index = (Start + I) % Count;
125 // If we find 0, it means the item isn't in the hash table.
126 uint32_t ID = IDs[Index];
128 return make_error<RawError>(raw_error_code::no_entry);
129 auto ExpectedStr = getStringForID(ID);
131 return ExpectedStr.takeError();
133 if (*ExpectedStr == Str)
136 return make_error<RawError>(raw_error_code::no_entry);
139 FixedStreamArray<support::ulittle32_t> PDBStringTable::name_ids() const {