1 //===--- TypeLoc.cpp - Type Source Info Wrapper -----------------*- 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 // This file defines the TypeLoc subclasses implementations.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "clang/AST/TypeLoc.h"
15 #include "clang/AST/ASTContext.h"
16 #include "clang/AST/Expr.h"
17 #include "clang/AST/TypeLocVisitor.h"
18 #include "llvm/Support/ErrorHandling.h"
19 #include "llvm/Support/raw_ostream.h"
20 using namespace clang;
21
22 static const unsigned TypeLocMaxDataAlign = llvm::alignOf<void *>();
23
24 //===----------------------------------------------------------------------===//
25 // TypeLoc Implementation
26 //===----------------------------------------------------------------------===//
27
28 namespace {
29 class TypeLocRanger : public TypeLocVisitor<TypeLocRanger, SourceRange> {
30 public:
31 #define ABSTRACT_TYPELOC(CLASS, PARENT)
32 #define TYPELOC(CLASS, PARENT) \
33 SourceRange Visit##CLASS##TypeLoc(CLASS##TypeLoc TyLoc) { \
34 return TyLoc.getLocalSourceRange(); \
35 }
36 #include "clang/AST/TypeLocNodes.def"
37 };
38 }
39
getLocalSourceRangeImpl(TypeLoc TL)40 SourceRange TypeLoc::getLocalSourceRangeImpl(TypeLoc TL) {
41 if (TL.isNull()) return SourceRange();
42 return TypeLocRanger().Visit(TL);
43 }
44
45 namespace {
46 class TypeAligner : public TypeLocVisitor<TypeAligner, unsigned> {
47 public:
48 #define ABSTRACT_TYPELOC(CLASS, PARENT)
49 #define TYPELOC(CLASS, PARENT) \
50 unsigned Visit##CLASS##TypeLoc(CLASS##TypeLoc TyLoc) { \
51 return TyLoc.getLocalDataAlignment(); \
52 }
53 #include "clang/AST/TypeLocNodes.def"
54 };
55 }
56
57 /// \brief Returns the alignment of the type source info data block.
getLocalAlignmentForType(QualType Ty)58 unsigned TypeLoc::getLocalAlignmentForType(QualType Ty) {
59 if (Ty.isNull()) return 1;
60 return TypeAligner().Visit(TypeLoc(Ty, nullptr));
61 }
62
63 namespace {
64 class TypeSizer : public TypeLocVisitor<TypeSizer, unsigned> {
65 public:
66 #define ABSTRACT_TYPELOC(CLASS, PARENT)
67 #define TYPELOC(CLASS, PARENT) \
68 unsigned Visit##CLASS##TypeLoc(CLASS##TypeLoc TyLoc) { \
69 return TyLoc.getLocalDataSize(); \
70 }
71 #include "clang/AST/TypeLocNodes.def"
72 };
73 }
74
75 /// \brief Returns the size of the type source info data block.
getFullDataSizeForType(QualType Ty)76 unsigned TypeLoc::getFullDataSizeForType(QualType Ty) {
77 unsigned Total = 0;
78 TypeLoc TyLoc(Ty, nullptr);
79 unsigned MaxAlign = 1;
80 while (!TyLoc.isNull()) {
81 unsigned Align = getLocalAlignmentForType(TyLoc.getType());
82 MaxAlign = std::max(Align, MaxAlign);
83 Total = llvm::alignTo(Total, Align);
84 Total += TypeSizer().Visit(TyLoc);
85 TyLoc = TyLoc.getNextTypeLoc();
86 }
87 Total = llvm::alignTo(Total, MaxAlign);
88 return Total;
89 }
90
91 namespace {
92 class NextLoc : public TypeLocVisitor<NextLoc, TypeLoc> {
93 public:
94 #define ABSTRACT_TYPELOC(CLASS, PARENT)
95 #define TYPELOC(CLASS, PARENT) \
96 TypeLoc Visit##CLASS##TypeLoc(CLASS##TypeLoc TyLoc) { \
97 return TyLoc.getNextTypeLoc(); \
98 }
99 #include "clang/AST/TypeLocNodes.def"
100 };
101 }
102
103 /// \brief Get the next TypeLoc pointed by this TypeLoc, e.g for "int*" the
104 /// TypeLoc is a PointerLoc and next TypeLoc is for "int".
getNextTypeLocImpl(TypeLoc TL)105 TypeLoc TypeLoc::getNextTypeLocImpl(TypeLoc TL) {
106 return NextLoc().Visit(TL);
107 }
108
109 /// \brief Initializes a type location, and all of its children
110 /// recursively, as if the entire tree had been written in the
111 /// given location.
initializeImpl(ASTContext & Context,TypeLoc TL,SourceLocation Loc)112 void TypeLoc::initializeImpl(ASTContext &Context, TypeLoc TL,
113 SourceLocation Loc) {
114 while (true) {
115 switch (TL.getTypeLocClass()) {
116 #define ABSTRACT_TYPELOC(CLASS, PARENT)
117 #define TYPELOC(CLASS, PARENT) \
118 case CLASS: { \
119 CLASS##TypeLoc TLCasted = TL.castAs<CLASS##TypeLoc>(); \
120 TLCasted.initializeLocal(Context, Loc); \
121 TL = TLCasted.getNextTypeLoc(); \
122 if (!TL) return; \
123 continue; \
124 }
125 #include "clang/AST/TypeLocNodes.def"
126 }
127 }
128 }
129
130 namespace {
131 class TypeLocCopier : public TypeLocVisitor<TypeLocCopier> {
132 TypeLoc Source;
133 public:
TypeLocCopier(TypeLoc source)134 TypeLocCopier(TypeLoc source) : Source(source) { }
135
136 #define ABSTRACT_TYPELOC(CLASS, PARENT)
137 #define TYPELOC(CLASS, PARENT) \
138 void Visit##CLASS##TypeLoc(CLASS##TypeLoc dest) { \
139 dest.copyLocal(Source.castAs<CLASS##TypeLoc>()); \
140 }
141 #include "clang/AST/TypeLocNodes.def"
142 };
143 }
144
145
copy(TypeLoc other)146 void TypeLoc::copy(TypeLoc other) {
147 assert(getFullDataSize() == other.getFullDataSize());
148
149 // If both data pointers are aligned to the maximum alignment, we
150 // can memcpy because getFullDataSize() accurately reflects the
151 // layout of the data.
152 if (reinterpret_cast<uintptr_t>(Data) ==
153 llvm::alignTo(reinterpret_cast<uintptr_t>(Data),
154 TypeLocMaxDataAlign) &&
155 reinterpret_cast<uintptr_t>(other.Data) ==
156 llvm::alignTo(reinterpret_cast<uintptr_t>(other.Data),
157 TypeLocMaxDataAlign)) {
158 memcpy(Data, other.Data, getFullDataSize());
159 return;
160 }
161
162 // Copy each of the pieces.
163 TypeLoc TL(getType(), Data);
164 do {
165 TypeLocCopier(other).Visit(TL);
166 other = other.getNextTypeLoc();
167 } while ((TL = TL.getNextTypeLoc()));
168 }
169
getBeginLoc() const170 SourceLocation TypeLoc::getBeginLoc() const {
171 TypeLoc Cur = *this;
172 TypeLoc LeftMost = Cur;
173 while (true) {
174 switch (Cur.getTypeLocClass()) {
175 case Elaborated:
176 LeftMost = Cur;
177 break;
178 case FunctionProto:
179 if (Cur.castAs<FunctionProtoTypeLoc>().getTypePtr()
180 ->hasTrailingReturn()) {
181 LeftMost = Cur;
182 break;
183 }
184 /* Fall through */
185 case FunctionNoProto:
186 case ConstantArray:
187 case DependentSizedArray:
188 case IncompleteArray:
189 case VariableArray:
190 // FIXME: Currently QualifiedTypeLoc does not have a source range
191 case Qualified:
192 Cur = Cur.getNextTypeLoc();
193 continue;
194 default:
195 if (Cur.getLocalSourceRange().getBegin().isValid())
196 LeftMost = Cur;
197 Cur = Cur.getNextTypeLoc();
198 if (Cur.isNull())
199 break;
200 continue;
201 } // switch
202 break;
203 } // while
204 return LeftMost.getLocalSourceRange().getBegin();
205 }
206
getEndLoc() const207 SourceLocation TypeLoc::getEndLoc() const {
208 TypeLoc Cur = *this;
209 TypeLoc Last;
210 while (true) {
211 switch (Cur.getTypeLocClass()) {
212 default:
213 if (!Last)
214 Last = Cur;
215 return Last.getLocalSourceRange().getEnd();
216 case Paren:
217 case ConstantArray:
218 case DependentSizedArray:
219 case IncompleteArray:
220 case VariableArray:
221 case FunctionNoProto:
222 Last = Cur;
223 break;
224 case FunctionProto:
225 if (Cur.castAs<FunctionProtoTypeLoc>().getTypePtr()->hasTrailingReturn())
226 Last = TypeLoc();
227 else
228 Last = Cur;
229 break;
230 case Pointer:
231 case BlockPointer:
232 case MemberPointer:
233 case LValueReference:
234 case RValueReference:
235 case PackExpansion:
236 if (!Last)
237 Last = Cur;
238 break;
239 case Qualified:
240 case Elaborated:
241 break;
242 }
243 Cur = Cur.getNextTypeLoc();
244 }
245 }
246
247
248 namespace {
249 struct TSTChecker : public TypeLocVisitor<TSTChecker, bool> {
250 // Overload resolution does the real work for us.
isTypeSpec__anonc83bc0d00611::TSTChecker251 static bool isTypeSpec(TypeSpecTypeLoc _) { return true; }
isTypeSpec__anonc83bc0d00611::TSTChecker252 static bool isTypeSpec(TypeLoc _) { return false; }
253
254 #define ABSTRACT_TYPELOC(CLASS, PARENT)
255 #define TYPELOC(CLASS, PARENT) \
256 bool Visit##CLASS##TypeLoc(CLASS##TypeLoc TyLoc) { \
257 return isTypeSpec(TyLoc); \
258 }
259 #include "clang/AST/TypeLocNodes.def"
260 };
261 }
262
263
264 /// \brief Determines if the given type loc corresponds to a
265 /// TypeSpecTypeLoc. Since there is not actually a TypeSpecType in
266 /// the type hierarchy, this is made somewhat complicated.
267 ///
268 /// There are a lot of types that currently use TypeSpecTypeLoc
269 /// because it's a convenient base class. Ideally we would not accept
270 /// those here, but ideally we would have better implementations for
271 /// them.
isKind(const TypeLoc & TL)272 bool TypeSpecTypeLoc::isKind(const TypeLoc &TL) {
273 if (TL.getType().hasLocalQualifiers()) return false;
274 return TSTChecker().Visit(TL);
275 }
276
277 // Reimplemented to account for GNU/C++ extension
278 // typeof unary-expression
279 // where there are no parentheses.
getLocalSourceRange() const280 SourceRange TypeOfExprTypeLoc::getLocalSourceRange() const {
281 if (getRParenLoc().isValid())
282 return SourceRange(getTypeofLoc(), getRParenLoc());
283 else
284 return SourceRange(getTypeofLoc(),
285 getUnderlyingExpr()->getSourceRange().getEnd());
286 }
287
288
getWrittenTypeSpec() const289 TypeSpecifierType BuiltinTypeLoc::getWrittenTypeSpec() const {
290 if (needsExtraLocalData())
291 return static_cast<TypeSpecifierType>(getWrittenBuiltinSpecs().Type);
292 switch (getTypePtr()->getKind()) {
293 case BuiltinType::Void:
294 return TST_void;
295 case BuiltinType::Bool:
296 return TST_bool;
297 case BuiltinType::Char_U:
298 case BuiltinType::Char_S:
299 return TST_char;
300 case BuiltinType::Char16:
301 return TST_char16;
302 case BuiltinType::Char32:
303 return TST_char32;
304 case BuiltinType::WChar_S:
305 case BuiltinType::WChar_U:
306 return TST_wchar;
307 case BuiltinType::UChar:
308 case BuiltinType::UShort:
309 case BuiltinType::UInt:
310 case BuiltinType::ULong:
311 case BuiltinType::ULongLong:
312 case BuiltinType::UInt128:
313 case BuiltinType::SChar:
314 case BuiltinType::Short:
315 case BuiltinType::Int:
316 case BuiltinType::Long:
317 case BuiltinType::LongLong:
318 case BuiltinType::Int128:
319 case BuiltinType::Half:
320 case BuiltinType::Float:
321 case BuiltinType::Double:
322 case BuiltinType::LongDouble:
323 case BuiltinType::Float128:
324 llvm_unreachable("Builtin type needs extra local data!");
325 // Fall through, if the impossible happens.
326
327 case BuiltinType::NullPtr:
328 case BuiltinType::Overload:
329 case BuiltinType::Dependent:
330 case BuiltinType::BoundMember:
331 case BuiltinType::UnknownAny:
332 case BuiltinType::ARCUnbridgedCast:
333 case BuiltinType::PseudoObject:
334 case BuiltinType::ObjCId:
335 case BuiltinType::ObjCClass:
336 case BuiltinType::ObjCSel:
337 #define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
338 case BuiltinType::Id:
339 #include "clang/Basic/OpenCLImageTypes.def"
340 case BuiltinType::OCLSampler:
341 case BuiltinType::OCLEvent:
342 case BuiltinType::OCLClkEvent:
343 case BuiltinType::OCLQueue:
344 case BuiltinType::OCLNDRange:
345 case BuiltinType::OCLReserveID:
346 case BuiltinType::BuiltinFn:
347 case BuiltinType::OMPArraySection:
348 return TST_unspecified;
349 }
350
351 llvm_unreachable("Invalid BuiltinType Kind!");
352 }
353
IgnoreParensImpl(TypeLoc TL)354 TypeLoc TypeLoc::IgnoreParensImpl(TypeLoc TL) {
355 while (ParenTypeLoc PTL = TL.getAs<ParenTypeLoc>())
356 TL = PTL.getInnerLoc();
357 return TL;
358 }
359
findNullabilityLoc() const360 SourceLocation TypeLoc::findNullabilityLoc() const {
361 if (auto attributedLoc = getAs<AttributedTypeLoc>()) {
362 if (attributedLoc.getAttrKind() == AttributedType::attr_nullable ||
363 attributedLoc.getAttrKind() == AttributedType::attr_nonnull ||
364 attributedLoc.getAttrKind() == AttributedType::attr_null_unspecified)
365 return attributedLoc.getAttrNameLoc();
366 }
367
368 return SourceLocation();
369 }
370
findExplicitQualifierLoc() const371 TypeLoc TypeLoc::findExplicitQualifierLoc() const {
372 // Qualified types.
373 if (auto qual = getAs<QualifiedTypeLoc>())
374 return qual;
375
376 TypeLoc loc = IgnoreParens();
377
378 // Attributed types.
379 if (auto attr = loc.getAs<AttributedTypeLoc>()) {
380 if (attr.isQualifier()) return attr;
381 return attr.getModifiedLoc().findExplicitQualifierLoc();
382 }
383
384 // C11 _Atomic types.
385 if (auto atomic = loc.getAs<AtomicTypeLoc>()) {
386 return atomic;
387 }
388
389 return TypeLoc();
390 }
391
initializeLocal(ASTContext & Context,SourceLocation Loc)392 void ObjCObjectTypeLoc::initializeLocal(ASTContext &Context,
393 SourceLocation Loc) {
394 setHasBaseTypeAsWritten(true);
395 setTypeArgsLAngleLoc(Loc);
396 setTypeArgsRAngleLoc(Loc);
397 for (unsigned i = 0, e = getNumTypeArgs(); i != e; ++i) {
398 setTypeArgTInfo(i,
399 Context.getTrivialTypeSourceInfo(
400 getTypePtr()->getTypeArgsAsWritten()[i], Loc));
401 }
402 setProtocolLAngleLoc(Loc);
403 setProtocolRAngleLoc(Loc);
404 for (unsigned i = 0, e = getNumProtocols(); i != e; ++i)
405 setProtocolLoc(i, Loc);
406 }
407
initializeLocal(ASTContext & Context,SourceLocation Loc)408 void TypeOfTypeLoc::initializeLocal(ASTContext &Context,
409 SourceLocation Loc) {
410 TypeofLikeTypeLoc<TypeOfTypeLoc, TypeOfType, TypeOfTypeLocInfo>
411 ::initializeLocal(Context, Loc);
412 this->getLocalData()->UnderlyingTInfo = Context.getTrivialTypeSourceInfo(
413 getUnderlyingType(), Loc);
414 }
415
initializeLocal(ASTContext & Context,SourceLocation Loc)416 void ElaboratedTypeLoc::initializeLocal(ASTContext &Context,
417 SourceLocation Loc) {
418 setElaboratedKeywordLoc(Loc);
419 NestedNameSpecifierLocBuilder Builder;
420 Builder.MakeTrivial(Context, getTypePtr()->getQualifier(), Loc);
421 setQualifierLoc(Builder.getWithLocInContext(Context));
422 }
423
initializeLocal(ASTContext & Context,SourceLocation Loc)424 void DependentNameTypeLoc::initializeLocal(ASTContext &Context,
425 SourceLocation Loc) {
426 setElaboratedKeywordLoc(Loc);
427 NestedNameSpecifierLocBuilder Builder;
428 Builder.MakeTrivial(Context, getTypePtr()->getQualifier(), Loc);
429 setQualifierLoc(Builder.getWithLocInContext(Context));
430 setNameLoc(Loc);
431 }
432
433 void
initializeLocal(ASTContext & Context,SourceLocation Loc)434 DependentTemplateSpecializationTypeLoc::initializeLocal(ASTContext &Context,
435 SourceLocation Loc) {
436 setElaboratedKeywordLoc(Loc);
437 if (getTypePtr()->getQualifier()) {
438 NestedNameSpecifierLocBuilder Builder;
439 Builder.MakeTrivial(Context, getTypePtr()->getQualifier(), Loc);
440 setQualifierLoc(Builder.getWithLocInContext(Context));
441 } else {
442 setQualifierLoc(NestedNameSpecifierLoc());
443 }
444 setTemplateKeywordLoc(Loc);
445 setTemplateNameLoc(Loc);
446 setLAngleLoc(Loc);
447 setRAngleLoc(Loc);
448 TemplateSpecializationTypeLoc::initializeArgLocs(Context, getNumArgs(),
449 getTypePtr()->getArgs(),
450 getArgInfos(), Loc);
451 }
452
initializeArgLocs(ASTContext & Context,unsigned NumArgs,const TemplateArgument * Args,TemplateArgumentLocInfo * ArgInfos,SourceLocation Loc)453 void TemplateSpecializationTypeLoc::initializeArgLocs(ASTContext &Context,
454 unsigned NumArgs,
455 const TemplateArgument *Args,
456 TemplateArgumentLocInfo *ArgInfos,
457 SourceLocation Loc) {
458 for (unsigned i = 0, e = NumArgs; i != e; ++i) {
459 switch (Args[i].getKind()) {
460 case TemplateArgument::Null:
461 llvm_unreachable("Impossible TemplateArgument");
462
463 case TemplateArgument::Integral:
464 case TemplateArgument::Declaration:
465 case TemplateArgument::NullPtr:
466 ArgInfos[i] = TemplateArgumentLocInfo();
467 break;
468
469 case TemplateArgument::Expression:
470 ArgInfos[i] = TemplateArgumentLocInfo(Args[i].getAsExpr());
471 break;
472
473 case TemplateArgument::Type:
474 ArgInfos[i] = TemplateArgumentLocInfo(
475 Context.getTrivialTypeSourceInfo(Args[i].getAsType(),
476 Loc));
477 break;
478
479 case TemplateArgument::Template:
480 case TemplateArgument::TemplateExpansion: {
481 NestedNameSpecifierLocBuilder Builder;
482 TemplateName Template = Args[i].getAsTemplateOrTemplatePattern();
483 if (DependentTemplateName *DTN = Template.getAsDependentTemplateName())
484 Builder.MakeTrivial(Context, DTN->getQualifier(), Loc);
485 else if (QualifiedTemplateName *QTN = Template.getAsQualifiedTemplateName())
486 Builder.MakeTrivial(Context, QTN->getQualifier(), Loc);
487
488 ArgInfos[i] = TemplateArgumentLocInfo(
489 Builder.getWithLocInContext(Context), Loc,
490 Args[i].getKind() == TemplateArgument::Template ? SourceLocation()
491 : Loc);
492 break;
493 }
494
495 case TemplateArgument::Pack:
496 ArgInfos[i] = TemplateArgumentLocInfo();
497 break;
498 }
499 }
500 }
501