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_TPIHASHING_H
10#define LLVM_DEBUGINFO_PDB_TPIHASHING_H
11
12#include "llvm/DebugInfo/CodeView/TypeRecord.h"
13#include "llvm/Support/Error.h"
14
15namespace llvm {
16namespace pdb {
17
18Expected<uint32_t> hashTypeRecord(const llvm::codeview::CVType &Type);
19
20struct TagRecordHash {
21  explicit TagRecordHash(codeview::ClassRecord CR, uint32_t Full,
22                         uint32_t Forward)
23      : FullRecordHash(Full), ForwardDeclHash(Forward), Class(std::move(CR)) {
24    State = 0;
25  }
26
27  explicit TagRecordHash(codeview::EnumRecord ER, uint32_t Full,
28                         uint32_t Forward)
29      : FullRecordHash(Full), ForwardDeclHash(Forward), Enum(std::move(ER)) {
30    State = 1;
31  }
32
33  explicit TagRecordHash(codeview::UnionRecord UR, uint32_t Full,
34                         uint32_t Forward)
35      : FullRecordHash(Full), ForwardDeclHash(Forward), Union(std::move(UR)) {
36    State = 2;
37  }
38
39  uint32_t FullRecordHash;
40  uint32_t ForwardDeclHash;
41
42  codeview::TagRecord &getRecord() {
43    switch (State) {
44    case 0:
45      return Class;
46    case 1:
47      return Enum;
48    case 2:
49      return Union;
50    }
51    llvm_unreachable("unreachable!");
52  }
53
54private:
55  union {
56    codeview::ClassRecord Class;
57    codeview::EnumRecord Enum;
58    codeview::UnionRecord Union;
59  };
60
61  uint8_t State = 0;
62};
63
64/// Given a CVType referring to a class, structure, union, or enum, compute
65/// the hash of its forward decl and full decl.
66Expected<TagRecordHash> hashTagRecord(const codeview::CVType &Type);
67
68} // end namespace pdb
69} // end namespace llvm
70
71#endif // LLVM_DEBUGINFO_PDB_TPIHASHING_H
72