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//===- TpiHashing.cpp -----------------------------------------------------===//
//
// 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/TpiHashing.h"
#include "llvm/DebugInfo/CodeView/TypeDeserializer.h"
#include "llvm/DebugInfo/PDB/Native/Hash.h"
#include "llvm/Support/CRC.h"
using namespace llvm;
using namespace llvm::codeview;
using namespace llvm::pdb;
// Corresponds to `fUDTAnon`.
static bool isAnonymous(StringRef Name) {
return Name == "<unnamed-tag>" || Name == "__unnamed" ||
Name.endswith("::<unnamed-tag>") || Name.endswith("::__unnamed");
}
// Computes the hash for a user-defined type record. This could be a struct,
// class, union, or enum.
static uint32_t getHashForUdt(const TagRecord &Rec,
ArrayRef<uint8_t> FullRecord) {
ClassOptions Opts = Rec.getOptions();
bool ForwardRef = bool(Opts & ClassOptions::ForwardReference);
bool Scoped = bool(Opts & ClassOptions::Scoped);
bool HasUniqueName = bool(Opts & ClassOptions::HasUniqueName);
bool IsAnon = HasUniqueName && isAnonymous(Rec.getName());
if (!ForwardRef && !Scoped && !IsAnon)
return hashStringV1(Rec.getName());
if (!ForwardRef && HasUniqueName && !IsAnon)
return hashStringV1(Rec.getUniqueName());
return hashBufferV8(FullRecord);
}
template <typename T>
static Expected<uint32_t> getHashForUdt(const CVType &Rec) {
T Deserialized;
if (auto E = TypeDeserializer::deserializeAs(const_cast<CVType &>(Rec),
Deserialized))
return std::move(E);
return getHashForUdt(Deserialized, Rec.data());
}
template <typename T>
static Expected<TagRecordHash> getTagRecordHashForUdt(const CVType &Rec) {
T Deserialized;
if (auto E = TypeDeserializer::deserializeAs(const_cast<CVType &>(Rec),
Deserialized))
return std::move(E);
ClassOptions Opts = Deserialized.getOptions();
bool ForwardRef = bool(Opts & ClassOptions::ForwardReference);
uint32_t ThisRecordHash = getHashForUdt(Deserialized, Rec.data());
// If we don't have a forward ref we can't compute the hash of it from the
// full record because it requires hashing the entire buffer.
if (!ForwardRef)
return TagRecordHash{std::move(Deserialized), ThisRecordHash, 0};
bool Scoped = bool(Opts & ClassOptions::Scoped);
StringRef NameToHash =
Scoped ? Deserialized.getUniqueName() : Deserialized.getName();
uint32_t FullHash = hashStringV1(NameToHash);
return TagRecordHash{std::move(Deserialized), FullHash, ThisRecordHash};
}
template <typename T>
static Expected<uint32_t> getSourceLineHash(const CVType &Rec) {
T Deserialized;
if (auto E = TypeDeserializer::deserializeAs(const_cast<CVType &>(Rec),
Deserialized))
return std::move(E);
char Buf[4];
support::endian::write32le(Buf, Deserialized.getUDT().getIndex());
return hashStringV1(StringRef(Buf, 4));
}
Expected<TagRecordHash> llvm::pdb::hashTagRecord(const codeview::CVType &Type) {
switch (Type.kind()) {
case LF_CLASS:
case LF_STRUCTURE:
case LF_INTERFACE:
return getTagRecordHashForUdt<ClassRecord>(Type);
case LF_UNION:
return getTagRecordHashForUdt<UnionRecord>(Type);
case LF_ENUM:
return getTagRecordHashForUdt<EnumRecord>(Type);
default:
assert(false && "Type is not a tag record!");
}
return make_error<StringError>("Invalid record type",
inconvertibleErrorCode());
}
Expected<uint32_t> llvm::pdb::hashTypeRecord(const CVType &Rec) {
switch (Rec.kind()) {
case LF_CLASS:
case LF_STRUCTURE:
case LF_INTERFACE:
return getHashForUdt<ClassRecord>(Rec);
case LF_UNION:
return getHashForUdt<UnionRecord>(Rec);
case LF_ENUM:
return getHashForUdt<EnumRecord>(Rec);
case LF_UDT_SRC_LINE:
return getSourceLineHash<UdtSourceLineRecord>(Rec);
case LF_UDT_MOD_SRC_LINE:
return getSourceLineHash<UdtModSourceLineRecord>(Rec);
default:
break;
}
// Run CRC32 over the bytes. This corresponds to `hashBufv8`.
JamCRC JC(/*Init=*/0U);
JC.update(Rec.data());
return JC.getCRC();
}
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