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//===- TpiHashing.cpp -----------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/DebugInfo/PDB/Raw/TpiHashing.h"
#include "llvm/DebugInfo/PDB/Raw/Hash.h"
#include "llvm/DebugInfo/PDB/Raw/RawError.h"
using namespace llvm;
using namespace llvm::codeview;
using namespace llvm::pdb;
// Corresponds to `fUDTAnon`.
template <typename T> static bool isAnonymous(T &Rec) {
StringRef Name = Rec.getName();
return Name == "<unnamed-tag>" || Name == "__unnamed" ||
Name.endswith("::<unnamed-tag>") || Name.endswith("::__unnamed");
}
// Computes a hash for a given TPI record.
template <typename T>
static uint32_t getTpiHash(T &Rec, ArrayRef<uint8_t> FullRecord) {
auto Opts = static_cast<uint16_t>(Rec.getOptions());
bool ForwardRef =
Opts & static_cast<uint16_t>(ClassOptions::ForwardReference);
bool Scoped = Opts & static_cast<uint16_t>(ClassOptions::Scoped);
bool UniqueName = Opts & static_cast<uint16_t>(ClassOptions::HasUniqueName);
bool IsAnon = UniqueName && isAnonymous(Rec);
if (!ForwardRef && !Scoped && !IsAnon)
return hashStringV1(Rec.getName());
if (!ForwardRef && UniqueName && !IsAnon)
return hashStringV1(Rec.getUniqueName());
return hashBufferV8(FullRecord);
}
template <typename T> static uint32_t getSourceLineHash(T &Rec) {
char Buf[4];
support::endian::write32le(Buf, Rec.getUDT().getIndex());
return hashStringV1(StringRef(Buf, 4));
}
void TpiHashUpdater::visitKnownRecordImpl(CVType &CVR,
UdtSourceLineRecord &Rec) {
CVR.Hash = getSourceLineHash(Rec);
}
void TpiHashUpdater::visitKnownRecordImpl(CVType &CVR,
UdtModSourceLineRecord &Rec) {
CVR.Hash = getSourceLineHash(Rec);
}
void TpiHashUpdater::visitKnownRecordImpl(CVType &CVR, ClassRecord &Rec) {
CVR.Hash = getTpiHash(Rec, CVR.data());
}
void TpiHashUpdater::visitKnownRecordImpl(CVType &CVR, EnumRecord &Rec) {
CVR.Hash = getTpiHash(Rec, CVR.data());
}
void TpiHashUpdater::visitKnownRecordImpl(CVType &CVR, UnionRecord &Rec) {
CVR.Hash = getTpiHash(Rec, CVR.data());
}
Error TpiHashVerifier::visitKnownRecord(CVType &CVR, UdtSourceLineRecord &Rec) {
return verifySourceLine(Rec.getUDT());
}
Error TpiHashVerifier::visitKnownRecord(CVType &CVR,
UdtModSourceLineRecord &Rec) {
return verifySourceLine(Rec.getUDT());
}
Error TpiHashVerifier::visitKnownRecord(CVType &CVR, ClassRecord &Rec) {
if (getTpiHash(Rec, CVR.data()) % NumHashBuckets != HashValues[Index])
return errorInvalidHash();
return Error::success();
}
Error TpiHashVerifier::visitKnownRecord(CVType &CVR, EnumRecord &Rec) {
if (getTpiHash(Rec, CVR.data()) % NumHashBuckets != HashValues[Index])
return errorInvalidHash();
return Error::success();
}
Error TpiHashVerifier::visitKnownRecord(CVType &CVR, UnionRecord &Rec) {
if (getTpiHash(Rec, CVR.data()) % NumHashBuckets != HashValues[Index])
return errorInvalidHash();
return Error::success();
}
Error TpiHashVerifier::verifySourceLine(codeview::TypeIndex TI) {
char Buf[4];
support::endian::write32le(Buf, TI.getIndex());
uint32_t Hash = hashStringV1(StringRef(Buf, 4));
if (Hash % NumHashBuckets != HashValues[Index])
return errorInvalidHash();
return Error::success();
}
Error TpiHashVerifier::visitTypeBegin(CVType &Rec) {
++Index;
RawRecord = Rec;
return Error::success();
}
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