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/Error.h" |
14 | |
15 | namespace llvm { |
16 | namespace pdb { |
17 | |
18 | Expected<uint32_t> hashTypeRecord(const llvm::codeview::CVType &Type); |
19 | |
20 | struct 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 | |
54 | private: |
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. |
66 | Expected<TagRecordHash> hashTagRecord(const codeview::CVType &Type); |
67 | |
68 | } // end namespace pdb |
69 | } // end namespace llvm |
70 | |
71 | #endif // LLVM_DEBUGINFO_PDB_NATIVE_TPIHASHING_H |
72 | |