1 //===- TpiHashing.cpp -----------------------------------------------------===//
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/TpiHashing.h"
12 #include "llvm/DebugInfo/PDB/Native/Hash.h"
13 #include "llvm/DebugInfo/PDB/Native/RawError.h"
16 using namespace llvm::codeview;
17 using namespace llvm::pdb;
19 // Corresponds to `fUDTAnon`.
20 template <typename T> static bool isAnonymous(T &Rec) {
21 StringRef Name = Rec.getName();
22 return Name == "<unnamed-tag>" || Name == "__unnamed" ||
23 Name.endswith("::<unnamed-tag>") || Name.endswith("::__unnamed");
26 // Computes a hash for a given TPI record.
28 static uint32_t getTpiHash(T &Rec, ArrayRef<uint8_t> FullRecord) {
29 auto Opts = static_cast<uint16_t>(Rec.getOptions());
32 Opts & static_cast<uint16_t>(ClassOptions::ForwardReference);
33 bool Scoped = Opts & static_cast<uint16_t>(ClassOptions::Scoped);
34 bool UniqueName = Opts & static_cast<uint16_t>(ClassOptions::HasUniqueName);
35 bool IsAnon = UniqueName && isAnonymous(Rec);
37 if (!ForwardRef && !Scoped && !IsAnon)
38 return hashStringV1(Rec.getName());
39 if (!ForwardRef && UniqueName && !IsAnon)
40 return hashStringV1(Rec.getUniqueName());
41 return hashBufferV8(FullRecord);
44 template <typename T> static uint32_t getSourceLineHash(T &Rec) {
46 support::endian::write32le(Buf, Rec.getUDT().getIndex());
47 return hashStringV1(StringRef(Buf, 4));
50 void TpiHashUpdater::visitKnownRecordImpl(CVType &CVR,
51 UdtSourceLineRecord &Rec) {
52 CVR.Hash = getSourceLineHash(Rec);
55 void TpiHashUpdater::visitKnownRecordImpl(CVType &CVR,
56 UdtModSourceLineRecord &Rec) {
57 CVR.Hash = getSourceLineHash(Rec);
60 void TpiHashUpdater::visitKnownRecordImpl(CVType &CVR, ClassRecord &Rec) {
61 CVR.Hash = getTpiHash(Rec, CVR.data());
64 void TpiHashUpdater::visitKnownRecordImpl(CVType &CVR, EnumRecord &Rec) {
65 CVR.Hash = getTpiHash(Rec, CVR.data());
68 void TpiHashUpdater::visitKnownRecordImpl(CVType &CVR, UnionRecord &Rec) {
69 CVR.Hash = getTpiHash(Rec, CVR.data());
72 Error TpiHashVerifier::visitKnownRecord(CVType &CVR, UdtSourceLineRecord &Rec) {
73 return verifySourceLine(Rec.getUDT());
76 Error TpiHashVerifier::visitKnownRecord(CVType &CVR,
77 UdtModSourceLineRecord &Rec) {
78 return verifySourceLine(Rec.getUDT());
81 Error TpiHashVerifier::visitKnownRecord(CVType &CVR, ClassRecord &Rec) {
82 if (getTpiHash(Rec, CVR.data()) % NumHashBuckets != HashValues[Index])
83 return errorInvalidHash();
84 return Error::success();
86 Error TpiHashVerifier::visitKnownRecord(CVType &CVR, EnumRecord &Rec) {
87 if (getTpiHash(Rec, CVR.data()) % NumHashBuckets != HashValues[Index])
88 return errorInvalidHash();
89 return Error::success();
91 Error TpiHashVerifier::visitKnownRecord(CVType &CVR, UnionRecord &Rec) {
92 if (getTpiHash(Rec, CVR.data()) % NumHashBuckets != HashValues[Index])
93 return errorInvalidHash();
94 return Error::success();
97 Error TpiHashVerifier::verifySourceLine(codeview::TypeIndex TI) {
99 support::endian::write32le(Buf, TI.getIndex());
100 uint32_t Hash = hashStringV1(StringRef(Buf, 4));
101 if (Hash % NumHashBuckets != HashValues[Index])
102 return errorInvalidHash();
103 return Error::success();
106 Error TpiHashVerifier::visitTypeBegin(CVType &Rec) {
109 return Error::success();