1 //===-- PdbSymUid.cpp -------------------------------------------*- C++ -*-===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 #include "PdbSymUid.h"
11
12 using namespace lldb_private;
13 using namespace lldb_private::npdb;
14 using namespace llvm::codeview;
15
16 namespace {
17 struct GenericIdRepr {
18 uint64_t tag : 4;
19 uint64_t data : 60;
20 };
21
22 struct CompilandIdRepr {
23 uint64_t tag : 4;
24 uint64_t modi : 16;
25 uint64_t unused : 44;
26 };
27
28 struct CompilandSymIdRepr {
29 uint64_t tag : 4;
30 uint64_t modi : 16;
31 uint64_t offset : 32;
32 uint64_t unused : 12;
33 };
34
35 struct GlobalSymIdRepr {
36 uint64_t tag : 4;
37 uint64_t offset : 32;
38 uint64_t pub : 1;
39 uint64_t unused : 27;
40 };
41
42 struct TypeSymIdRepr {
43 uint64_t tag : 4;
44 uint64_t index : 32;
45 uint64_t ipi : 1;
46 uint64_t unused : 27;
47 };
48
49 struct FieldListMemberIdRepr {
50 uint64_t tag : 4;
51 uint64_t index : 32;
52 uint64_t offset : 16;
53 uint64_t unused : 12;
54 };
55
56 static_assert(sizeof(CompilandIdRepr) == 8, "Invalid structure size!");
57 static_assert(sizeof(CompilandSymIdRepr) == 8, "Invalid structure size!");
58 static_assert(sizeof(GlobalSymIdRepr) == 8, "Invalid structure size!");
59 static_assert(sizeof(TypeSymIdRepr) == 8, "Invalid structure size!");
60 static_assert(sizeof(FieldListMemberIdRepr) == 8, "Invalid structure size!");
61 } // namespace
62
repr_cast(const InT & value)63 template <typename OutT, typename InT> static OutT repr_cast(const InT &value) {
64 OutT result;
65 ::memcpy(&result, &value, sizeof(value));
66 return result;
67 }
68
PdbSymUid(const PdbCompilandId & cid)69 PdbSymUid::PdbSymUid(const PdbCompilandId &cid) {
70 CompilandIdRepr repr;
71 ::memset(&repr, 0, sizeof(repr));
72 repr.modi = cid.modi;
73 repr.tag = static_cast<uint64_t>(PdbSymUidKind::Compiland);
74 m_repr = repr_cast<uint64_t>(repr);
75 }
76
PdbSymUid(const PdbCompilandSymId & csid)77 PdbSymUid::PdbSymUid(const PdbCompilandSymId &csid) {
78 CompilandSymIdRepr repr;
79 ::memset(&repr, 0, sizeof(repr));
80 repr.modi = csid.modi;
81 repr.offset = csid.offset;
82 repr.tag = static_cast<uint64_t>(PdbSymUidKind::CompilandSym);
83 m_repr = repr_cast<uint64_t>(repr);
84 }
85
PdbSymUid(const PdbGlobalSymId & gsid)86 PdbSymUid::PdbSymUid(const PdbGlobalSymId &gsid) {
87 GlobalSymIdRepr repr;
88 ::memset(&repr, 0, sizeof(repr));
89 repr.pub = gsid.is_public;
90 repr.offset = gsid.offset;
91 repr.tag = static_cast<uint64_t>(PdbSymUidKind::GlobalSym);
92 m_repr = repr_cast<uint64_t>(repr);
93 }
94
PdbSymUid(const PdbTypeSymId & tsid)95 PdbSymUid::PdbSymUid(const PdbTypeSymId &tsid) {
96 TypeSymIdRepr repr;
97 ::memset(&repr, 0, sizeof(repr));
98 repr.index = tsid.index.getIndex();
99 repr.ipi = tsid.is_ipi;
100 repr.tag = static_cast<uint64_t>(PdbSymUidKind::Type);
101 m_repr = repr_cast<uint64_t>(repr);
102 }
103
PdbSymUid(const PdbFieldListMemberId & flmid)104 PdbSymUid::PdbSymUid(const PdbFieldListMemberId &flmid) {
105 FieldListMemberIdRepr repr;
106 ::memset(&repr, 0, sizeof(repr));
107 repr.index = flmid.index.getIndex();
108 repr.offset = flmid.offset;
109 repr.tag = static_cast<uint64_t>(PdbSymUidKind::FieldListMember);
110 m_repr = repr_cast<uint64_t>(repr);
111 }
112
kind() const113 PdbSymUidKind PdbSymUid::kind() const {
114 GenericIdRepr generic = repr_cast<GenericIdRepr>(m_repr);
115 return static_cast<PdbSymUidKind>(generic.tag);
116 }
117
asCompiland() const118 PdbCompilandId PdbSymUid::asCompiland() const {
119 assert(kind() == PdbSymUidKind::Compiland);
120 auto repr = repr_cast<CompilandIdRepr>(m_repr);
121 PdbCompilandId result;
122 result.modi = repr.modi;
123 return result;
124 }
125
asCompilandSym() const126 PdbCompilandSymId PdbSymUid::asCompilandSym() const {
127 assert(kind() == PdbSymUidKind::CompilandSym);
128 auto repr = repr_cast<CompilandSymIdRepr>(m_repr);
129 PdbCompilandSymId result;
130 result.modi = repr.modi;
131 result.offset = repr.offset;
132 return result;
133 }
134
asGlobalSym() const135 PdbGlobalSymId PdbSymUid::asGlobalSym() const {
136 assert(kind() == PdbSymUidKind::GlobalSym ||
137 kind() == PdbSymUidKind::PublicSym);
138 auto repr = repr_cast<GlobalSymIdRepr>(m_repr);
139 PdbGlobalSymId result;
140 result.is_public = repr.pub;
141 result.offset = repr.offset;
142 return result;
143 }
144
asTypeSym() const145 PdbTypeSymId PdbSymUid::asTypeSym() const {
146 assert(kind() == PdbSymUidKind::Type);
147 auto repr = repr_cast<TypeSymIdRepr>(m_repr);
148 PdbTypeSymId result;
149 result.index.setIndex(repr.index);
150 result.is_ipi = repr.ipi;
151 return result;
152 }
153
asFieldListMember() const154 PdbFieldListMemberId PdbSymUid::asFieldListMember() const {
155 assert(kind() == PdbSymUidKind::FieldListMember);
156 auto repr = repr_cast<FieldListMemberIdRepr>(m_repr);
157 PdbFieldListMemberId result;
158 result.index.setIndex(repr.index);
159 result.offset = repr.offset;
160 return result;
161 }
162