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//===- TpiHashing.h ---------------------------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_DEBUGINFO_PDB_NATIVE_TPIHASHING_H
#define LLVM_DEBUGINFO_PDB_NATIVE_TPIHASHING_H
#include "llvm/DebugInfo/CodeView/TypeRecord.h"
#include "llvm/Support/Error.h"
namespace llvm {
namespace pdb {
Expected<uint32_t> hashTypeRecord(const llvm::codeview::CVType &Type);
struct TagRecordHash {
explicit TagRecordHash(codeview::ClassRecord CR, uint32_t Full,
uint32_t Forward)
: FullRecordHash(Full), ForwardDeclHash(Forward), Class(std::move(CR)) {
State = 0;
}
explicit TagRecordHash(codeview::EnumRecord ER, uint32_t Full,
uint32_t Forward)
: FullRecordHash(Full), ForwardDeclHash(Forward), Enum(std::move(ER)) {
State = 1;
}
explicit TagRecordHash(codeview::UnionRecord UR, uint32_t Full,
uint32_t Forward)
: FullRecordHash(Full), ForwardDeclHash(Forward), Union(std::move(UR)) {
State = 2;
}
uint32_t FullRecordHash;
uint32_t ForwardDeclHash;
codeview::TagRecord &getRecord() {
switch (State) {
case 0:
return Class;
case 1:
return Enum;
case 2:
return Union;
}
llvm_unreachable("unreachable!");
}
private:
union {
codeview::ClassRecord Class;
codeview::EnumRecord Enum;
codeview::UnionRecord Union;
};
uint8_t State = 0;
};
/// Given a CVType referring to a class, structure, union, or enum, compute
/// the hash of its forward decl and full decl.
Expected<TagRecordHash> hashTagRecord(const codeview::CVType &Type);
} // end namespace pdb
} // end namespace llvm
#endif // LLVM_DEBUGINFO_PDB_NATIVE_TPIHASHING_H
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