90 lines
2.9 KiB
C++
90 lines
2.9 KiB
C++
//===- TpiHashing.cpp -----------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/DebugInfo/PDB/Native/TpiHashing.h"
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#include "llvm/DebugInfo/CodeView/TypeDeserializer.h"
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#include "llvm/DebugInfo/PDB/Native/Hash.h"
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#include "llvm/Support/JamCRC.h"
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using namespace llvm;
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using namespace llvm::codeview;
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using namespace llvm::pdb;
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// Corresponds to `fUDTAnon`.
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static bool isAnonymous(StringRef Name) {
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return Name == "<unnamed-tag>" || Name == "__unnamed" ||
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Name.endswith("::<unnamed-tag>") || Name.endswith("::__unnamed");
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}
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// Computes the hash for a user-defined type record. This could be a struct,
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// class, union, or enum.
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static uint32_t getHashForUdt(const TagRecord &Rec,
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ArrayRef<uint8_t> FullRecord) {
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ClassOptions Opts = Rec.getOptions();
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bool ForwardRef = bool(Opts & ClassOptions::ForwardReference);
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bool Scoped = bool(Opts & ClassOptions::Scoped);
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bool HasUniqueName = bool(Opts & ClassOptions::HasUniqueName);
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bool IsAnon = HasUniqueName && isAnonymous(Rec.getName());
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if (!ForwardRef && !Scoped && !IsAnon)
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return hashStringV1(Rec.getName());
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if (!ForwardRef && HasUniqueName && !IsAnon)
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return hashStringV1(Rec.getUniqueName());
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return hashBufferV8(FullRecord);
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}
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template <typename T>
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static Expected<uint32_t> getHashForUdt(const CVType &Rec) {
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T Deserialized;
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if (auto E = TypeDeserializer::deserializeAs(const_cast<CVType &>(Rec),
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Deserialized))
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return std::move(E);
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return getHashForUdt(Deserialized, Rec.data());
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}
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template <typename T>
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static Expected<uint32_t> getSourceLineHash(const CVType &Rec) {
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T Deserialized;
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if (auto E = TypeDeserializer::deserializeAs(const_cast<CVType &>(Rec),
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Deserialized))
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return std::move(E);
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char Buf[4];
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support::endian::write32le(Buf, Deserialized.getUDT().getIndex());
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return hashStringV1(StringRef(Buf, 4));
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}
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Expected<uint32_t> llvm::pdb::hashTypeRecord(const CVType &Rec) {
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switch (Rec.kind()) {
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case LF_CLASS:
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case LF_STRUCTURE:
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case LF_INTERFACE:
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return getHashForUdt<ClassRecord>(Rec);
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case LF_UNION:
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return getHashForUdt<UnionRecord>(Rec);
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case LF_ENUM:
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return getHashForUdt<EnumRecord>(Rec);
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case LF_UDT_SRC_LINE:
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return getSourceLineHash<UdtSourceLineRecord>(Rec);
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case LF_UDT_MOD_SRC_LINE:
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return getSourceLineHash<UdtModSourceLineRecord>(Rec);
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default:
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break;
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}
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// Run CRC32 over the bytes. This corresponds to `hashBufv8`.
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JamCRC JC(/*Init=*/0U);
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ArrayRef<char> Bytes(reinterpret_cast<const char *>(Rec.data().data()),
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Rec.data().size());
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JC.update(Bytes);
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return JC.getCRC();
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}
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