1//===-- PdbSymUid.cpp -----------------------------------------------------===//
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#include "PdbSymUid.h"
10
11using namespace lldb_private;
12using namespace lldb_private::npdb;
13using namespace llvm::codeview;
14
15namespace {
16struct GenericIdRepr {
17 uint64_t tag : 4;
18 uint64_t data : 60;
19};
20
21struct CompilandIdRepr {
22 uint64_t tag : 4;
23 uint64_t modi : 16;
24 uint64_t unused : 44;
25};
26
27struct CompilandSymIdRepr {
28 uint64_t tag : 4;
29 uint64_t modi : 16;
30 uint64_t offset : 32;
31 uint64_t unused : 12;
32};
33
34struct GlobalSymIdRepr {
35 uint64_t tag : 4;
36 uint64_t offset : 32;
37 uint64_t pub : 1;
38 uint64_t unused : 27;
39};
40
41struct TypeSymIdRepr {
42 uint64_t tag : 4;
43 uint64_t index : 32;
44 uint64_t ipi : 1;
45 uint64_t unused : 27;
46};
47
48struct FieldListMemberIdRepr {
49 uint64_t tag : 4;
50 uint64_t index : 32;
51 uint64_t offset : 16;
52 uint64_t unused : 12;
53};
54
55static_assert(sizeof(CompilandIdRepr) == 8, "Invalid structure size!");
56static_assert(sizeof(CompilandSymIdRepr) == 8, "Invalid structure size!");
57static_assert(sizeof(GlobalSymIdRepr) == 8, "Invalid structure size!");
58static_assert(sizeof(TypeSymIdRepr) == 8, "Invalid structure size!");
59static_assert(sizeof(FieldListMemberIdRepr) == 8, "Invalid structure size!");
60} // namespace
61
62template <typename OutT, typename InT> static OutT repr_cast(const InT &value) {
63 OutT result;
64 ::memcpy(dest: &result, src: &value, n: sizeof(value));
65 return result;
66}
67
68PdbSymUid::PdbSymUid(const PdbCompilandId &cid) {
69 CompilandIdRepr repr;
70 ::memset(s: &repr, c: 0, n: sizeof(repr));
71 repr.modi = cid.modi;
72 repr.tag = static_cast<uint64_t>(PdbSymUidKind::Compiland);
73 m_repr = repr_cast<uint64_t>(value: repr);
74}
75
76PdbSymUid::PdbSymUid(const PdbCompilandSymId &csid) {
77 CompilandSymIdRepr repr;
78 ::memset(s: &repr, c: 0, n: sizeof(repr));
79 repr.modi = csid.modi;
80 repr.offset = csid.offset;
81 repr.tag = static_cast<uint64_t>(PdbSymUidKind::CompilandSym);
82 m_repr = repr_cast<uint64_t>(value: repr);
83}
84
85PdbSymUid::PdbSymUid(const PdbGlobalSymId &gsid) {
86 GlobalSymIdRepr repr;
87 ::memset(s: &repr, c: 0, n: sizeof(repr));
88 repr.pub = gsid.is_public;
89 repr.offset = gsid.offset;
90 repr.tag = static_cast<uint64_t>(PdbSymUidKind::GlobalSym);
91 m_repr = repr_cast<uint64_t>(value: repr);
92}
93
94PdbSymUid::PdbSymUid(const PdbTypeSymId &tsid) {
95 TypeSymIdRepr repr;
96 ::memset(s: &repr, c: 0, n: sizeof(repr));
97 repr.index = tsid.index.getIndex();
98 repr.ipi = tsid.is_ipi;
99 repr.tag = static_cast<uint64_t>(PdbSymUidKind::Type);
100 m_repr = repr_cast<uint64_t>(value: repr);
101}
102
103PdbSymUid::PdbSymUid(const PdbFieldListMemberId &flmid) {
104 FieldListMemberIdRepr repr;
105 ::memset(s: &repr, c: 0, n: sizeof(repr));
106 repr.index = flmid.index.getIndex();
107 repr.offset = flmid.offset;
108 repr.tag = static_cast<uint64_t>(PdbSymUidKind::FieldListMember);
109 m_repr = repr_cast<uint64_t>(value: repr);
110}
111
112PdbSymUidKind PdbSymUid::kind() const {
113 GenericIdRepr generic = repr_cast<GenericIdRepr>(value: m_repr);
114 return static_cast<PdbSymUidKind>(generic.tag);
115}
116
117PdbCompilandId PdbSymUid::asCompiland() const {
118 assert(kind() == PdbSymUidKind::Compiland);
119 auto repr = repr_cast<CompilandIdRepr>(value: m_repr);
120 PdbCompilandId result;
121 result.modi = repr.modi;
122 return result;
123}
124
125PdbCompilandSymId PdbSymUid::asCompilandSym() const {
126 assert(kind() == PdbSymUidKind::CompilandSym);
127 auto repr = repr_cast<CompilandSymIdRepr>(value: m_repr);
128 PdbCompilandSymId result;
129 result.modi = repr.modi;
130 result.offset = repr.offset;
131 return result;
132}
133
134PdbGlobalSymId PdbSymUid::asGlobalSym() const {
135 assert(kind() == PdbSymUidKind::GlobalSym ||
136 kind() == PdbSymUidKind::PublicSym);
137 auto repr = repr_cast<GlobalSymIdRepr>(value: m_repr);
138 PdbGlobalSymId result;
139 result.is_public = repr.pub;
140 result.offset = repr.offset;
141 return result;
142}
143
144PdbTypeSymId PdbSymUid::asTypeSym() const {
145 assert(kind() == PdbSymUidKind::Type);
146 auto repr = repr_cast<TypeSymIdRepr>(value: m_repr);
147 PdbTypeSymId result;
148 result.index.setIndex(repr.index);
149 result.is_ipi = repr.ipi;
150 return result;
151}
152
153PdbFieldListMemberId PdbSymUid::asFieldListMember() const {
154 assert(kind() == PdbSymUidKind::FieldListMember);
155 auto repr = repr_cast<FieldListMemberIdRepr>(value: m_repr);
156 PdbFieldListMemberId result;
157 result.index.setIndex(repr.index);
158 result.offset = repr.offset;
159 return result;
160}
161

source code of lldb/source/Plugins/SymbolFile/NativePDB/PdbSymUid.cpp