1//===- RecordName.cpp ----------------------------------------- *- 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#include "llvm/DebugInfo/CodeView/RecordName.h"
10
11#include "llvm/ADT/SmallString.h"
12#include "llvm/ADT/StringExtras.h"
13#include "llvm/DebugInfo/CodeView/CVTypeVisitor.h"
14#include "llvm/DebugInfo/CodeView/CodeView.h"
15#include "llvm/DebugInfo/CodeView/SymbolRecord.h"
16#include "llvm/DebugInfo/CodeView/SymbolRecordMapping.h"
17#include "llvm/DebugInfo/CodeView/TypeCollection.h"
18#include "llvm/DebugInfo/CodeView/TypeIndex.h"
19#include "llvm/DebugInfo/CodeView/TypeRecord.h"
20#include "llvm/DebugInfo/CodeView/TypeVisitorCallbacks.h"
21#include "llvm/Support/FormatVariadic.h"
22
23using namespace llvm;
24using namespace llvm::codeview;
25
26namespace {
27class TypeNameComputer : public TypeVisitorCallbacks {
28 /// The type collection. Used to calculate names of nested types.
29 TypeCollection &Types;
30 TypeIndex CurrentTypeIndex = TypeIndex::None();
31
32 /// Name of the current type. Only valid before visitTypeEnd.
33 SmallString<256> Name;
34
35public:
36 explicit TypeNameComputer(TypeCollection &Types) : Types(Types) {}
37
38 StringRef name() const { return Name; }
39
40 /// Paired begin/end actions for all types. Receives all record data,
41 /// including the fixed-length record prefix.
42 Error visitTypeBegin(CVType &Record) override;
43 Error visitTypeBegin(CVType &Record, TypeIndex Index) override;
44 Error visitTypeEnd(CVType &Record) override;
45
46#define TYPE_RECORD(EnumName, EnumVal, Name) \
47 Error visitKnownRecord(CVType &CVR, Name##Record &Record) override;
48#define TYPE_RECORD_ALIAS(EnumName, EnumVal, Name, AliasName)
49#define MEMBER_RECORD(EnumName, EnumVal, Name)
50#include "llvm/DebugInfo/CodeView/CodeViewTypes.def"
51};
52} // namespace
53
54Error TypeNameComputer::visitTypeBegin(CVType &Record) {
55 llvm_unreachable("Must call visitTypeBegin with a TypeIndex!");
56 return Error::success();
57}
58
59Error TypeNameComputer::visitTypeBegin(CVType &Record, TypeIndex Index) {
60 // Reset Name to the empty string. If the visitor sets it, we know it.
61 Name = "";
62 CurrentTypeIndex = Index;
63 return Error::success();
64}
65
66Error TypeNameComputer::visitTypeEnd(CVType &CVR) { return Error::success(); }
67
68Error TypeNameComputer::visitKnownRecord(CVType &CVR,
69 FieldListRecord &FieldList) {
70 Name = "<field list>";
71 return Error::success();
72}
73
74Error TypeNameComputer::visitKnownRecord(CVRecord<TypeLeafKind> &CVR,
75 StringIdRecord &String) {
76 Name = String.getString();
77 return Error::success();
78}
79
80Error TypeNameComputer::visitKnownRecord(CVType &CVR, ArgListRecord &Args) {
81 auto Indices = Args.getIndices();
82 uint32_t Size = Indices.size();
83 Name = "(";
84 for (uint32_t I = 0; I < Size; ++I) {
85 if (Indices[I] < CurrentTypeIndex)
86 Name.append(RHS: Types.getTypeName(Index: Indices[I]));
87 else
88 Name.append(RHS: "<unknown 0x" + utohexstr(X: Indices[I].getIndex()) + ">");
89 if (I + 1 != Size)
90 Name.append(RHS: ", ");
91 }
92 Name.push_back(Elt: ')');
93 return Error::success();
94}
95
96Error TypeNameComputer::visitKnownRecord(CVType &CVR,
97 StringListRecord &Strings) {
98 auto Indices = Strings.getIndices();
99 uint32_t Size = Indices.size();
100 Name = "\"";
101 for (uint32_t I = 0; I < Size; ++I) {
102 Name.append(RHS: Types.getTypeName(Index: Indices[I]));
103 if (I + 1 != Size)
104 Name.append(RHS: "\" \"");
105 }
106 Name.push_back(Elt: '\"');
107 return Error::success();
108}
109
110Error TypeNameComputer::visitKnownRecord(CVType &CVR, ClassRecord &Class) {
111 Name = Class.getName();
112 return Error::success();
113}
114
115Error TypeNameComputer::visitKnownRecord(CVType &CVR, UnionRecord &Union) {
116 Name = Union.getName();
117 return Error::success();
118}
119
120Error TypeNameComputer::visitKnownRecord(CVType &CVR, EnumRecord &Enum) {
121 Name = Enum.getName();
122 return Error::success();
123}
124
125Error TypeNameComputer::visitKnownRecord(CVType &CVR, ArrayRecord &AT) {
126 Name = AT.getName();
127 return Error::success();
128}
129
130Error TypeNameComputer::visitKnownRecord(CVType &CVR, VFTableRecord &VFT) {
131 Name = VFT.getName();
132 return Error::success();
133}
134
135Error TypeNameComputer::visitKnownRecord(CVType &CVR, MemberFuncIdRecord &Id) {
136 Name = Id.getName();
137 return Error::success();
138}
139
140Error TypeNameComputer::visitKnownRecord(CVType &CVR, ProcedureRecord &Proc) {
141 StringRef Ret = Types.getTypeName(Index: Proc.getReturnType());
142 StringRef Params = Types.getTypeName(Index: Proc.getArgumentList());
143 Name = formatv(Fmt: "{0} {1}", Vals&: Ret, Vals&: Params).sstr<256>();
144 return Error::success();
145}
146
147Error TypeNameComputer::visitKnownRecord(CVType &CVR,
148 MemberFunctionRecord &MF) {
149 StringRef Ret = Types.getTypeName(Index: MF.getReturnType());
150 StringRef Class = Types.getTypeName(Index: MF.getClassType());
151 StringRef Params = Types.getTypeName(Index: MF.getArgumentList());
152 Name = formatv(Fmt: "{0} {1}::{2}", Vals&: Ret, Vals&: Class, Vals&: Params).sstr<256>();
153 return Error::success();
154}
155
156Error TypeNameComputer::visitKnownRecord(CVType &CVR, FuncIdRecord &Func) {
157 Name = Func.getName();
158 return Error::success();
159}
160
161Error TypeNameComputer::visitKnownRecord(CVType &CVR, TypeServer2Record &TS) {
162 Name = TS.getName();
163 return Error::success();
164}
165
166Error TypeNameComputer::visitKnownRecord(CVType &CVR, PointerRecord &Ptr) {
167
168 if (Ptr.isPointerToMember()) {
169 const MemberPointerInfo &MI = Ptr.getMemberInfo();
170
171 StringRef Pointee = Types.getTypeName(Index: Ptr.getReferentType());
172 StringRef Class = Types.getTypeName(Index: MI.getContainingType());
173 Name = formatv(Fmt: "{0} {1}::*", Vals&: Pointee, Vals&: Class);
174 } else {
175 Name.append(RHS: Types.getTypeName(Index: Ptr.getReferentType()));
176
177 if (Ptr.getMode() == PointerMode::LValueReference)
178 Name.append(RHS: "&");
179 else if (Ptr.getMode() == PointerMode::RValueReference)
180 Name.append(RHS: "&&");
181 else if (Ptr.getMode() == PointerMode::Pointer)
182 Name.append(RHS: "*");
183
184 // Qualifiers in pointer records apply to the pointer, not the pointee, so
185 // they go on the right.
186 if (Ptr.isConst())
187 Name.append(RHS: " const");
188 if (Ptr.isVolatile())
189 Name.append(RHS: " volatile");
190 if (Ptr.isUnaligned())
191 Name.append(RHS: " __unaligned");
192 if (Ptr.isRestrict())
193 Name.append(RHS: " __restrict");
194 }
195 return Error::success();
196}
197
198Error TypeNameComputer::visitKnownRecord(CVType &CVR, ModifierRecord &Mod) {
199 uint16_t Mods = static_cast<uint16_t>(Mod.getModifiers());
200
201 if (Mods & uint16_t(ModifierOptions::Const))
202 Name.append(RHS: "const ");
203 if (Mods & uint16_t(ModifierOptions::Volatile))
204 Name.append(RHS: "volatile ");
205 if (Mods & uint16_t(ModifierOptions::Unaligned))
206 Name.append(RHS: "__unaligned ");
207 Name.append(RHS: Types.getTypeName(Index: Mod.getModifiedType()));
208 return Error::success();
209}
210
211Error TypeNameComputer::visitKnownRecord(CVType &CVR,
212 VFTableShapeRecord &Shape) {
213 Name = formatv(Fmt: "<vftable {0} methods>", Vals: Shape.getEntryCount());
214 return Error::success();
215}
216
217Error TypeNameComputer::visitKnownRecord(
218 CVType &CVR, UdtModSourceLineRecord &ModSourceLine) {
219 return Error::success();
220}
221
222Error TypeNameComputer::visitKnownRecord(CVType &CVR,
223 UdtSourceLineRecord &SourceLine) {
224 return Error::success();
225}
226
227Error TypeNameComputer::visitKnownRecord(CVType &CVR, BitFieldRecord &BF) {
228 return Error::success();
229}
230
231Error TypeNameComputer::visitKnownRecord(CVType &CVR,
232 MethodOverloadListRecord &Overloads) {
233 return Error::success();
234}
235
236Error TypeNameComputer::visitKnownRecord(CVType &CVR, BuildInfoRecord &BI) {
237 return Error::success();
238}
239
240Error TypeNameComputer::visitKnownRecord(CVType &CVR, LabelRecord &R) {
241 return Error::success();
242}
243
244Error TypeNameComputer::visitKnownRecord(CVType &CVR,
245 PrecompRecord &Precomp) {
246 return Error::success();
247}
248
249Error TypeNameComputer::visitKnownRecord(CVType &CVR,
250 EndPrecompRecord &EndPrecomp) {
251 return Error::success();
252}
253
254std::string llvm::codeview::computeTypeName(TypeCollection &Types,
255 TypeIndex Index) {
256 TypeNameComputer Computer(Types);
257 CVType Record = Types.getType(Index);
258 if (auto EC = visitTypeRecord(Record, Index, Callbacks&: Computer)) {
259 consumeError(Err: std::move(EC));
260 return "<unknown UDT>";
261 }
262 return std::string(Computer.name());
263}
264
265static int getSymbolNameOffset(CVSymbol Sym) {
266 switch (Sym.kind()) {
267 // See ProcSym
268 case SymbolKind::S_GPROC32:
269 case SymbolKind::S_LPROC32:
270 case SymbolKind::S_GPROC32_ID:
271 case SymbolKind::S_LPROC32_ID:
272 case SymbolKind::S_LPROC32_DPC:
273 case SymbolKind::S_LPROC32_DPC_ID:
274 return 35;
275 // See Thunk32Sym
276 case SymbolKind::S_THUNK32:
277 return 21;
278 // See SectionSym
279 case SymbolKind::S_SECTION:
280 return 16;
281 // See CoffGroupSym
282 case SymbolKind::S_COFFGROUP:
283 return 14;
284 // See PublicSym32, FileStaticSym, RegRelativeSym, DataSym, ThreadLocalDataSym
285 case SymbolKind::S_PUB32:
286 case SymbolKind::S_FILESTATIC:
287 case SymbolKind::S_REGREL32:
288 case SymbolKind::S_GDATA32:
289 case SymbolKind::S_LDATA32:
290 case SymbolKind::S_LMANDATA:
291 case SymbolKind::S_GMANDATA:
292 case SymbolKind::S_LTHREAD32:
293 case SymbolKind::S_GTHREAD32:
294 case SymbolKind::S_PROCREF:
295 case SymbolKind::S_LPROCREF:
296 return 10;
297 // See RegisterSym and LocalSym
298 case SymbolKind::S_REGISTER:
299 case SymbolKind::S_LOCAL:
300 return 6;
301 // See BlockSym
302 case SymbolKind::S_BLOCK32:
303 return 18;
304 // See LabelSym
305 case SymbolKind::S_LABEL32:
306 return 7;
307 // See ObjNameSym, ExportSym, and UDTSym
308 case SymbolKind::S_OBJNAME:
309 case SymbolKind::S_EXPORT:
310 case SymbolKind::S_UDT:
311 return 4;
312 // See BPRelativeSym
313 case SymbolKind::S_BPREL32:
314 return 8;
315 // See UsingNamespaceSym
316 case SymbolKind::S_UNAMESPACE:
317 return 0;
318 default:
319 return -1;
320 }
321}
322
323StringRef llvm::codeview::getSymbolName(CVSymbol Sym) {
324 if (Sym.kind() == SymbolKind::S_CONSTANT) {
325 // S_CONSTANT is preceded by an APSInt, which has a variable length. So we
326 // have to do a full deserialization.
327 BinaryStreamReader Reader(Sym.content(), llvm::endianness::little);
328 // The container doesn't matter for single records.
329 SymbolRecordMapping Mapping(Reader, CodeViewContainer::ObjectFile);
330 ConstantSym Const(SymbolKind::S_CONSTANT);
331 cantFail(Err: Mapping.visitSymbolBegin(Record&: Sym));
332 cantFail(Err: Mapping.visitKnownRecord(CVR&: Sym, Record&: Const));
333 cantFail(Err: Mapping.visitSymbolEnd(Record&: Sym));
334 return Const.Name;
335 }
336
337 int Offset = getSymbolNameOffset(Sym);
338 if (Offset == -1)
339 return StringRef();
340
341 StringRef StringData = toStringRef(Input: Sym.content()).drop_front(N: Offset);
342 return StringData.split(Separator: '\0').first;
343}
344

source code of llvm/lib/DebugInfo/CodeView/RecordName.cpp