1 //===--- ASTDumper.cpp - Dumping implementation for ASTs ------------------===//
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 // This file implements the AST dump methods, which dump out the
10 // AST in a form that exposes type details and other fields.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "clang/AST/ASTDumper.h"
15 #include "clang/AST/ASTContext.h"
16 #include "clang/AST/DeclLookups.h"
17 #include "clang/AST/JSONNodeDumper.h"
18 #include "clang/Basic/Builtins.h"
19 #include "clang/Basic/Module.h"
20 #include "clang/Basic/SourceManager.h"
21 #include "llvm/Support/raw_ostream.h"
22
23 using namespace clang;
24 using namespace clang::comments;
25
dumpInvalidDeclContext(const DeclContext * DC)26 void ASTDumper::dumpInvalidDeclContext(const DeclContext *DC) {
27 NodeDumper.AddChild([=] {
28 if (!DC) {
29 ColorScope Color(OS, ShowColors, NullColor);
30 OS << "<<<NULL>>>";
31 return;
32 }
33 // An invalid DeclContext is one for which a dyn_cast() from a DeclContext
34 // pointer to a Decl pointer would fail an assertion or otherwise fall prey
35 // to undefined behavior as a result of an invalid associated DeclKind.
36 // Such invalidity is not supposed to happen of course, but, when it does,
37 // the information provided below is intended to provide some hints about
38 // what might have gone awry.
39 {
40 ColorScope Color(OS, ShowColors, DeclKindNameColor);
41 OS << "DeclContext";
42 }
43 NodeDumper.dumpPointer(DC);
44 OS << " <";
45 {
46 ColorScope Color(OS, ShowColors, DeclNameColor);
47 OS << "unrecognized Decl kind " << (unsigned)DC->getDeclKind();
48 }
49 OS << ">";
50 });
51 }
52
dumpLookups(const DeclContext * DC,bool DumpDecls)53 void ASTDumper::dumpLookups(const DeclContext *DC, bool DumpDecls) {
54 NodeDumper.AddChild([=] {
55 OS << "StoredDeclsMap ";
56 NodeDumper.dumpBareDeclRef(cast<Decl>(DC));
57
58 const DeclContext *Primary = DC->getPrimaryContext();
59 if (Primary != DC) {
60 OS << " primary";
61 NodeDumper.dumpPointer(cast<Decl>(Primary));
62 }
63
64 bool HasUndeserializedLookups = Primary->hasExternalVisibleStorage();
65
66 auto Range = getDeserialize()
67 ? Primary->lookups()
68 : Primary->noload_lookups(/*PreserveInternalState=*/true);
69 for (auto I = Range.begin(), E = Range.end(); I != E; ++I) {
70 DeclarationName Name = I.getLookupName();
71 DeclContextLookupResult R = *I;
72
73 NodeDumper.AddChild([=] {
74 OS << "DeclarationName ";
75 {
76 ColorScope Color(OS, ShowColors, DeclNameColor);
77 OS << '\'' << Name << '\'';
78 }
79
80 for (DeclContextLookupResult::iterator RI = R.begin(), RE = R.end();
81 RI != RE; ++RI) {
82 NodeDumper.AddChild([=] {
83 NodeDumper.dumpBareDeclRef(*RI);
84
85 if (!(*RI)->isUnconditionallyVisible())
86 OS << " hidden";
87
88 // If requested, dump the redecl chain for this lookup.
89 if (DumpDecls) {
90 // Dump earliest decl first.
91 std::function<void(Decl *)> DumpWithPrev = [&](Decl *D) {
92 if (Decl *Prev = D->getPreviousDecl())
93 DumpWithPrev(Prev);
94 Visit(D);
95 };
96 DumpWithPrev(*RI);
97 }
98 });
99 }
100 });
101 }
102
103 if (HasUndeserializedLookups) {
104 NodeDumper.AddChild([=] {
105 ColorScope Color(OS, ShowColors, UndeserializedColor);
106 OS << "<undeserialized lookups>";
107 });
108 }
109 });
110 }
111
112 template <typename SpecializationDecl>
dumpTemplateDeclSpecialization(const SpecializationDecl * D,bool DumpExplicitInst,bool DumpRefOnly)113 void ASTDumper::dumpTemplateDeclSpecialization(const SpecializationDecl *D,
114 bool DumpExplicitInst,
115 bool DumpRefOnly) {
116 bool DumpedAny = false;
117 for (const auto *RedeclWithBadType : D->redecls()) {
118 // FIXME: The redecls() range sometimes has elements of a less-specific
119 // type. (In particular, ClassTemplateSpecializationDecl::redecls() gives
120 // us TagDecls, and should give CXXRecordDecls).
121 auto *Redecl = cast<SpecializationDecl>(RedeclWithBadType);
122 switch (Redecl->getTemplateSpecializationKind()) {
123 case TSK_ExplicitInstantiationDeclaration:
124 case TSK_ExplicitInstantiationDefinition:
125 if (!DumpExplicitInst)
126 break;
127 [[fallthrough]];
128 case TSK_Undeclared:
129 case TSK_ImplicitInstantiation:
130 if (DumpRefOnly)
131 NodeDumper.dumpDeclRef(Redecl);
132 else
133 Visit(Redecl);
134 DumpedAny = true;
135 break;
136 case TSK_ExplicitSpecialization:
137 break;
138 }
139 }
140
141 // Ensure we dump at least one decl for each specialization.
142 if (!DumpedAny)
143 NodeDumper.dumpDeclRef(D);
144 }
145
146 template <typename TemplateDecl>
dumpTemplateDecl(const TemplateDecl * D,bool DumpExplicitInst)147 void ASTDumper::dumpTemplateDecl(const TemplateDecl *D, bool DumpExplicitInst) {
148 dumpTemplateParameters(D->getTemplateParameters());
149
150 Visit(D->getTemplatedDecl());
151
152 if (GetTraversalKind() == TK_AsIs) {
153 for (const auto *Child : D->specializations())
154 dumpTemplateDeclSpecialization(Child, DumpExplicitInst,
155 !D->isCanonicalDecl());
156 }
157 }
158
VisitFunctionTemplateDecl(const FunctionTemplateDecl * D)159 void ASTDumper::VisitFunctionTemplateDecl(const FunctionTemplateDecl *D) {
160 // FIXME: We don't add a declaration of a function template specialization
161 // to its context when it's explicitly instantiated, so dump explicit
162 // instantiations when we dump the template itself.
163 dumpTemplateDecl(D, true);
164 }
165
VisitClassTemplateDecl(const ClassTemplateDecl * D)166 void ASTDumper::VisitClassTemplateDecl(const ClassTemplateDecl *D) {
167 dumpTemplateDecl(D, false);
168 }
169
VisitVarTemplateDecl(const VarTemplateDecl * D)170 void ASTDumper::VisitVarTemplateDecl(const VarTemplateDecl *D) {
171 dumpTemplateDecl(D, false);
172 }
173
174 //===----------------------------------------------------------------------===//
175 // Type method implementations
176 //===----------------------------------------------------------------------===//
177
dump(const char * msg) const178 void QualType::dump(const char *msg) const {
179 if (msg)
180 llvm::errs() << msg << ": ";
181 dump();
182 }
183
dump() const184 LLVM_DUMP_METHOD void QualType::dump() const {
185 ASTDumper Dumper(llvm::errs(), /*ShowColors=*/false);
186 Dumper.Visit(*this);
187 }
188
dump(llvm::raw_ostream & OS,const ASTContext & Context) const189 LLVM_DUMP_METHOD void QualType::dump(llvm::raw_ostream &OS,
190 const ASTContext &Context) const {
191 ASTDumper Dumper(OS, Context, Context.getDiagnostics().getShowColors());
192 Dumper.Visit(*this);
193 }
194
dump() const195 LLVM_DUMP_METHOD void Type::dump() const { QualType(this, 0).dump(); }
196
dump(llvm::raw_ostream & OS,const ASTContext & Context) const197 LLVM_DUMP_METHOD void Type::dump(llvm::raw_ostream &OS,
198 const ASTContext &Context) const {
199 QualType(this, 0).dump(OS, Context);
200 }
201
202 //===----------------------------------------------------------------------===//
203 // Decl method implementations
204 //===----------------------------------------------------------------------===//
205
dump() const206 LLVM_DUMP_METHOD void Decl::dump() const { dump(llvm::errs()); }
207
dump(raw_ostream & OS,bool Deserialize,ASTDumpOutputFormat Format) const208 LLVM_DUMP_METHOD void Decl::dump(raw_ostream &OS, bool Deserialize,
209 ASTDumpOutputFormat Format) const {
210 ASTContext &Ctx = getASTContext();
211 const SourceManager &SM = Ctx.getSourceManager();
212
213 if (ADOF_JSON == Format) {
214 JSONDumper P(OS, SM, Ctx, Ctx.getPrintingPolicy(),
215 &Ctx.getCommentCommandTraits());
216 (void)Deserialize; // FIXME?
217 P.Visit(this);
218 } else {
219 ASTDumper P(OS, Ctx, Ctx.getDiagnostics().getShowColors());
220 P.setDeserialize(Deserialize);
221 P.Visit(this);
222 }
223 }
224
dumpColor() const225 LLVM_DUMP_METHOD void Decl::dumpColor() const {
226 const ASTContext &Ctx = getASTContext();
227 ASTDumper P(llvm::errs(), Ctx, /*ShowColors=*/true);
228 P.Visit(this);
229 }
230
dumpAsDecl() const231 LLVM_DUMP_METHOD void DeclContext::dumpAsDecl() const {
232 dumpAsDecl(nullptr);
233 }
234
dumpAsDecl(const ASTContext * Ctx) const235 LLVM_DUMP_METHOD void DeclContext::dumpAsDecl(const ASTContext *Ctx) const {
236 // By design, DeclContext is required to be a base class of some class that
237 // derives from Decl. Thus, it should always be possible to dyn_cast() from
238 // a DeclContext pointer to a Decl pointer and Decl::castFromDeclContext()
239 // asserts that to be the case. Since this function is intended for use in a
240 // debugger, it performs an additional check in order to prevent a failed
241 // cast and assertion. If that check fails, then the (invalid) DeclContext
242 // is dumped with an indication of its invalidity.
243 if (hasValidDeclKind()) {
244 const auto *D = cast<Decl>(this);
245 D->dump();
246 } else {
247 // If an ASTContext is not available, a less capable ASTDumper is
248 // constructed for which color diagnostics are, regrettably, disabled.
249 ASTDumper P = Ctx ? ASTDumper(llvm::errs(), *Ctx,
250 Ctx->getDiagnostics().getShowColors())
251 : ASTDumper(llvm::errs(), /*ShowColors*/ false);
252 P.dumpInvalidDeclContext(this);
253 }
254 }
255
dumpLookups() const256 LLVM_DUMP_METHOD void DeclContext::dumpLookups() const {
257 dumpLookups(llvm::errs());
258 }
259
dumpLookups(raw_ostream & OS,bool DumpDecls,bool Deserialize) const260 LLVM_DUMP_METHOD void DeclContext::dumpLookups(raw_ostream &OS,
261 bool DumpDecls,
262 bool Deserialize) const {
263 const DeclContext *DC = this;
264 while (!DC->isTranslationUnit())
265 DC = DC->getParent();
266 const ASTContext &Ctx = cast<TranslationUnitDecl>(DC)->getASTContext();
267 ASTDumper P(OS, Ctx, Ctx.getDiagnostics().getShowColors());
268 P.setDeserialize(Deserialize);
269 P.dumpLookups(this, DumpDecls);
270 }
271
272 //===----------------------------------------------------------------------===//
273 // Stmt method implementations
274 //===----------------------------------------------------------------------===//
275
dump() const276 LLVM_DUMP_METHOD void Stmt::dump() const {
277 ASTDumper P(llvm::errs(), /*ShowColors=*/false);
278 P.Visit(this);
279 }
280
dump(raw_ostream & OS,const ASTContext & Context) const281 LLVM_DUMP_METHOD void Stmt::dump(raw_ostream &OS,
282 const ASTContext &Context) const {
283 ASTDumper P(OS, Context, Context.getDiagnostics().getShowColors());
284 P.Visit(this);
285 }
286
dumpColor() const287 LLVM_DUMP_METHOD void Stmt::dumpColor() const {
288 ASTDumper P(llvm::errs(), /*ShowColors=*/true);
289 P.Visit(this);
290 }
291
292 //===----------------------------------------------------------------------===//
293 // Comment method implementations
294 //===----------------------------------------------------------------------===//
295
dump() const296 LLVM_DUMP_METHOD void Comment::dump() const {
297 const auto *FC = dyn_cast<FullComment>(this);
298 if (!FC)
299 return;
300 ASTDumper Dumper(llvm::errs(), /*ShowColors=*/false);
301 Dumper.Visit(FC, FC);
302 }
303
dump(raw_ostream & OS,const ASTContext & Context) const304 LLVM_DUMP_METHOD void Comment::dump(raw_ostream &OS,
305 const ASTContext &Context) const {
306 const auto *FC = dyn_cast<FullComment>(this);
307 if (!FC)
308 return;
309 ASTDumper Dumper(OS, Context, Context.getDiagnostics().getShowColors());
310 Dumper.Visit(FC, FC);
311 }
312
dumpColor() const313 LLVM_DUMP_METHOD void Comment::dumpColor() const {
314 const auto *FC = dyn_cast<FullComment>(this);
315 if (!FC)
316 return;
317 ASTDumper Dumper(llvm::errs(), /*ShowColors=*/true);
318 Dumper.Visit(FC, FC);
319 }
320
321 //===----------------------------------------------------------------------===//
322 // APValue method implementations
323 //===----------------------------------------------------------------------===//
324
dump() const325 LLVM_DUMP_METHOD void APValue::dump() const {
326 ASTDumper Dumper(llvm::errs(), /*ShowColors=*/false);
327 Dumper.Visit(*this, /*Ty=*/QualType());
328 }
329
dump(raw_ostream & OS,const ASTContext & Context) const330 LLVM_DUMP_METHOD void APValue::dump(raw_ostream &OS,
331 const ASTContext &Context) const {
332 ASTDumper Dumper(llvm::errs(), Context,
333 Context.getDiagnostics().getShowColors());
334 Dumper.Visit(*this, /*Ty=*/Context.getPointerType(Context.CharTy));
335 }
336