1//===- TpiHashing.h ---------------------------------------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#ifndef LLVM_DEBUGINFO_PDB_NATIVE_TPIHASHING_H
10#define LLVM_DEBUGINFO_PDB_NATIVE_TPIHASHING_H
11
12#include "llvm/DebugInfo/CodeView/TypeRecord.h"
13#include "llvm/Support/Compiler.h"
14#include "llvm/Support/Error.h"
15
16namespace llvm {
17namespace pdb {
18
19LLVM_ABI Expected<uint32_t> hashTypeRecord(const llvm::codeview::CVType &Type);
20
21struct TagRecordHash {
22 explicit TagRecordHash(codeview::ClassRecord CR, uint32_t Full,
23 uint32_t Forward)
24 : FullRecordHash(Full), ForwardDeclHash(Forward), Class(std::move(CR)) {
25 State = 0;
26 }
27
28 explicit TagRecordHash(codeview::EnumRecord ER, uint32_t Full,
29 uint32_t Forward)
30 : FullRecordHash(Full), ForwardDeclHash(Forward), Enum(std::move(ER)) {
31 State = 1;
32 }
33
34 explicit TagRecordHash(codeview::UnionRecord UR, uint32_t Full,
35 uint32_t Forward)
36 : FullRecordHash(Full), ForwardDeclHash(Forward), Union(std::move(UR)) {
37 State = 2;
38 }
39
40 uint32_t FullRecordHash;
41 uint32_t ForwardDeclHash;
42
43 codeview::TagRecord &getRecord() {
44 switch (State) {
45 case 0:
46 return Class;
47 case 1:
48 return Enum;
49 case 2:
50 return Union;
51 }
52 llvm_unreachable("unreachable!");
53 }
54
55private:
56 union {
57 codeview::ClassRecord Class;
58 codeview::EnumRecord Enum;
59 codeview::UnionRecord Union;
60 };
61
62 uint8_t State = 0;
63};
64
65/// Given a CVType referring to a class, structure, union, or enum, compute
66/// the hash of its forward decl and full decl.
67LLVM_ABI Expected<TagRecordHash> hashTagRecord(const codeview::CVType &Type);
68
69} // end namespace pdb
70} // end namespace llvm
71
72#endif // LLVM_DEBUGINFO_PDB_NATIVE_TPIHASHING_H
73