1 //===--- SemaType.cpp - Semantic Analysis for Types -----------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements type-related semantic analysis.
12 //===----------------------------------------------------------------------===//
15 #include "clang/AST/ASTContext.h"
16 #include "clang/AST/CXXInheritance.h"
17 #include "clang/AST/DeclObjC.h"
18 #include "clang/AST/DeclTemplate.h"
19 #include "clang/AST/TypeLoc.h"
20 #include "clang/AST/TypeLocVisitor.h"
21 #include "clang/AST/Expr.h"
22 #include "clang/Basic/PartialDiagnostic.h"
23 #include "clang/Parse/DeclSpec.h"
24 #include "llvm/ADT/SmallPtrSet.h"
25 #include "llvm/Support/ErrorHandling.h"
26 using namespace clang;
28 /// \brief Perform adjustment on the parameter type of a function.
30 /// This routine adjusts the given parameter type @p T to the actual
31 /// parameter type used by semantic analysis (C99 6.7.5.3p[7,8],
32 /// C++ [dcl.fct]p3). The adjusted parameter type is returned.
33 QualType Sema::adjustParameterType(QualType T) {
35 // A declaration of a parameter as "array of type" shall be
36 // adjusted to "qualified pointer to type", where the type
37 // qualifiers (if any) are those specified within the [ and ] of
38 // the array type derivation.
40 return Context.getArrayDecayedType(T);
43 // A declaration of a parameter as "function returning type"
44 // shall be adjusted to "pointer to function returning type", as
46 if (T->isFunctionType())
47 return Context.getPointerType(T);
54 /// isOmittedBlockReturnType - Return true if this declarator is missing a
55 /// return type because this is a omitted return type on a block literal.
56 static bool isOmittedBlockReturnType(const Declarator &D) {
57 if (D.getContext() != Declarator::BlockLiteralContext ||
58 D.getDeclSpec().hasTypeSpecifier())
61 if (D.getNumTypeObjects() == 0)
62 return true; // ^{ ... }
64 if (D.getNumTypeObjects() == 1 &&
65 D.getTypeObject(0).Kind == DeclaratorChunk::Function)
66 return true; // ^(int X, float Y) { ... }
71 /// \brief Convert the specified declspec to the appropriate type
73 /// \param D the declarator containing the declaration specifier.
74 /// \returns The type described by the declaration specifiers. This function
75 /// never returns null.
76 static QualType ConvertDeclSpecToType(Declarator &TheDeclarator, Sema &TheSema){
77 // FIXME: Should move the logic from DeclSpec::Finish to here for validity
79 const DeclSpec &DS = TheDeclarator.getDeclSpec();
80 SourceLocation DeclLoc = TheDeclarator.getIdentifierLoc();
81 if (DeclLoc.isInvalid())
82 DeclLoc = DS.getSourceRange().getBegin();
84 ASTContext &Context = TheSema.Context;
87 switch (DS.getTypeSpecType()) {
88 case DeclSpec::TST_void:
89 Result = Context.VoidTy;
91 case DeclSpec::TST_char:
92 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified)
93 Result = Context.CharTy;
94 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed)
95 Result = Context.SignedCharTy;
97 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned &&
99 Result = Context.UnsignedCharTy;
102 case DeclSpec::TST_wchar:
103 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified)
104 Result = Context.WCharTy;
105 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) {
106 TheSema.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec)
107 << DS.getSpecifierName(DS.getTypeSpecType());
108 Result = Context.getSignedWCharType();
110 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned &&
111 "Unknown TSS value");
112 TheSema.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec)
113 << DS.getSpecifierName(DS.getTypeSpecType());
114 Result = Context.getUnsignedWCharType();
117 case DeclSpec::TST_char16:
118 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified &&
119 "Unknown TSS value");
120 Result = Context.Char16Ty;
122 case DeclSpec::TST_char32:
123 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified &&
124 "Unknown TSS value");
125 Result = Context.Char32Ty;
127 case DeclSpec::TST_unspecified:
128 // "<proto1,proto2>" is an objc qualified ID with a missing id.
129 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) {
130 Result = Context.getObjCObjectPointerType(Context.ObjCBuiltinIdTy,
131 (ObjCProtocolDecl**)PQ,
132 DS.getNumProtocolQualifiers());
136 // If this is a missing declspec in a block literal return context, then it
137 // is inferred from the return statements inside the block.
138 if (isOmittedBlockReturnType(TheDeclarator)) {
139 Result = Context.DependentTy;
143 // Unspecified typespec defaults to int in C90. However, the C90 grammar
144 // [C90 6.5] only allows a decl-spec if there was *some* type-specifier,
145 // type-qualifier, or storage-class-specifier. If not, emit an extwarn.
146 // Note that the one exception to this is function definitions, which are
147 // allowed to be completely missing a declspec. This is handled in the
148 // parser already though by it pretending to have seen an 'int' in this
150 if (TheSema.getLangOptions().ImplicitInt) {
151 // In C89 mode, we only warn if there is a completely missing declspec
152 // when one is not allowed.
154 TheSema.Diag(DeclLoc, diag::ext_missing_declspec)
155 << DS.getSourceRange()
156 << CodeModificationHint::CreateInsertion(DS.getSourceRange().getBegin(),
159 } else if (!DS.hasTypeSpecifier()) {
160 // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says:
161 // "At least one type specifier shall be given in the declaration
162 // specifiers in each declaration, and in the specifier-qualifier list in
163 // each struct declaration and type name."
164 // FIXME: Does Microsoft really have the implicit int extension in C++?
165 if (TheSema.getLangOptions().CPlusPlus &&
166 !TheSema.getLangOptions().Microsoft) {
167 TheSema.Diag(DeclLoc, diag::err_missing_type_specifier)
168 << DS.getSourceRange();
170 // When this occurs in C++ code, often something is very broken with the
171 // value being declared, poison it as invalid so we don't get chains of
173 TheDeclarator.setInvalidType(true);
175 TheSema.Diag(DeclLoc, diag::ext_missing_type_specifier)
176 << DS.getSourceRange();
181 case DeclSpec::TST_int: {
182 if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) {
183 switch (DS.getTypeSpecWidth()) {
184 case DeclSpec::TSW_unspecified: Result = Context.IntTy; break;
185 case DeclSpec::TSW_short: Result = Context.ShortTy; break;
186 case DeclSpec::TSW_long: Result = Context.LongTy; break;
187 case DeclSpec::TSW_longlong:
188 Result = Context.LongLongTy;
190 // long long is a C99 feature.
191 if (!TheSema.getLangOptions().C99 &&
192 !TheSema.getLangOptions().CPlusPlus0x)
193 TheSema.Diag(DS.getTypeSpecWidthLoc(), diag::ext_longlong);
197 switch (DS.getTypeSpecWidth()) {
198 case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break;
199 case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break;
200 case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break;
201 case DeclSpec::TSW_longlong:
202 Result = Context.UnsignedLongLongTy;
204 // long long is a C99 feature.
205 if (!TheSema.getLangOptions().C99 &&
206 !TheSema.getLangOptions().CPlusPlus0x)
207 TheSema.Diag(DS.getTypeSpecWidthLoc(), diag::ext_longlong);
213 case DeclSpec::TST_float: Result = Context.FloatTy; break;
214 case DeclSpec::TST_double:
215 if (DS.getTypeSpecWidth() == DeclSpec::TSW_long)
216 Result = Context.LongDoubleTy;
218 Result = Context.DoubleTy;
220 case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool
221 case DeclSpec::TST_decimal32: // _Decimal32
222 case DeclSpec::TST_decimal64: // _Decimal64
223 case DeclSpec::TST_decimal128: // _Decimal128
224 TheSema.Diag(DS.getTypeSpecTypeLoc(), diag::err_decimal_unsupported);
225 Result = Context.IntTy;
226 TheDeclarator.setInvalidType(true);
228 case DeclSpec::TST_class:
229 case DeclSpec::TST_enum:
230 case DeclSpec::TST_union:
231 case DeclSpec::TST_struct: {
233 = dyn_cast_or_null<TypeDecl>(static_cast<Decl *>(DS.getTypeRep()));
235 // This can happen in C++ with ambiguous lookups.
236 Result = Context.IntTy;
237 TheDeclarator.setInvalidType(true);
241 // If the type is deprecated or unavailable, diagnose it.
242 TheSema.DiagnoseUseOfDecl(D, DS.getTypeSpecTypeLoc());
244 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 &&
245 DS.getTypeSpecSign() == 0 && "No qualifiers on tag names!");
247 // TypeQuals handled by caller.
248 Result = Context.getTypeDeclType(D);
250 // In C++, make an ElaboratedType.
251 if (TheSema.getLangOptions().CPlusPlus) {
253 = TagDecl::getTagKindForTypeSpec(DS.getTypeSpecType());
254 Result = Context.getElaboratedType(Result, Tag);
257 if (D->isInvalidDecl())
258 TheDeclarator.setInvalidType(true);
261 case DeclSpec::TST_typename: {
262 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 &&
263 DS.getTypeSpecSign() == 0 &&
264 "Can't handle qualifiers on typedef names yet!");
265 Result = TheSema.GetTypeFromParser(DS.getTypeRep());
267 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) {
268 if (const ObjCInterfaceType *
269 Interface = Result->getAs<ObjCInterfaceType>()) {
270 // It would be nice if protocol qualifiers were only stored with the
271 // ObjCObjectPointerType. Unfortunately, this isn't possible due
272 // to the following typedef idiom (which is uncommon, but allowed):
275 // static void func() {
279 Result = Context.getObjCInterfaceType(Interface->getDecl(),
280 (ObjCProtocolDecl**)PQ,
281 DS.getNumProtocolQualifiers());
282 } else if (Result->isObjCIdType())
284 Result = Context.getObjCObjectPointerType(Context.ObjCBuiltinIdTy,
285 (ObjCProtocolDecl**)PQ, DS.getNumProtocolQualifiers());
286 else if (Result->isObjCClassType()) {
287 // Class<protocol-list>
288 Result = Context.getObjCObjectPointerType(Context.ObjCBuiltinClassTy,
289 (ObjCProtocolDecl**)PQ, DS.getNumProtocolQualifiers());
291 TheSema.Diag(DeclLoc, diag::err_invalid_protocol_qualifiers)
292 << DS.getSourceRange();
293 TheDeclarator.setInvalidType(true);
297 // TypeQuals handled by caller.
300 case DeclSpec::TST_typeofType:
301 // FIXME: Preserve type source info.
302 Result = TheSema.GetTypeFromParser(DS.getTypeRep());
303 assert(!Result.isNull() && "Didn't get a type for typeof?");
304 // TypeQuals handled by caller.
305 Result = Context.getTypeOfType(Result);
307 case DeclSpec::TST_typeofExpr: {
308 Expr *E = static_cast<Expr *>(DS.getTypeRep());
309 assert(E && "Didn't get an expression for typeof?");
310 // TypeQuals handled by caller.
311 Result = TheSema.BuildTypeofExprType(E);
312 if (Result.isNull()) {
313 Result = Context.IntTy;
314 TheDeclarator.setInvalidType(true);
318 case DeclSpec::TST_decltype: {
319 Expr *E = static_cast<Expr *>(DS.getTypeRep());
320 assert(E && "Didn't get an expression for decltype?");
321 // TypeQuals handled by caller.
322 Result = TheSema.BuildDecltypeType(E);
323 if (Result.isNull()) {
324 Result = Context.IntTy;
325 TheDeclarator.setInvalidType(true);
329 case DeclSpec::TST_auto: {
330 // TypeQuals handled by caller.
331 Result = Context.UndeducedAutoTy;
335 case DeclSpec::TST_error:
336 Result = Context.IntTy;
337 TheDeclarator.setInvalidType(true);
341 // Handle complex types.
342 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) {
343 if (TheSema.getLangOptions().Freestanding)
344 TheSema.Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex);
345 Result = Context.getComplexType(Result);
348 assert(DS.getTypeSpecComplex() != DeclSpec::TSC_imaginary &&
349 "FIXME: imaginary types not supported yet!");
351 // See if there are any attributes on the declspec that apply to the type (as
352 // opposed to the decl).
353 if (const AttributeList *AL = DS.getAttributes())
354 TheSema.ProcessTypeAttributeList(Result, AL);
356 // Apply const/volatile/restrict qualifiers to T.
357 if (unsigned TypeQuals = DS.getTypeQualifiers()) {
359 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object
360 // or incomplete types shall not be restrict-qualified." C++ also allows
361 // restrict-qualified references.
362 if (TypeQuals & DeclSpec::TQ_restrict) {
363 if (Result->isAnyPointerType() || Result->isReferenceType()) {
365 if (Result->isObjCObjectPointerType())
368 EltTy = Result->isPointerType() ?
369 Result->getAs<PointerType>()->getPointeeType() :
370 Result->getAs<ReferenceType>()->getPointeeType();
372 // If we have a pointer or reference, the pointee must have an object
374 if (!EltTy->isIncompleteOrObjectType()) {
375 TheSema.Diag(DS.getRestrictSpecLoc(),
376 diag::err_typecheck_invalid_restrict_invalid_pointee)
377 << EltTy << DS.getSourceRange();
378 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier.
381 TheSema.Diag(DS.getRestrictSpecLoc(),
382 diag::err_typecheck_invalid_restrict_not_pointer)
383 << Result << DS.getSourceRange();
384 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier.
388 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification
389 // of a function type includes any type qualifiers, the behavior is
391 if (Result->isFunctionType() && TypeQuals) {
392 // Get some location to point at, either the C or V location.
394 if (TypeQuals & DeclSpec::TQ_const)
395 Loc = DS.getConstSpecLoc();
396 else if (TypeQuals & DeclSpec::TQ_volatile)
397 Loc = DS.getVolatileSpecLoc();
399 assert((TypeQuals & DeclSpec::TQ_restrict) &&
400 "Has CVR quals but not C, V, or R?");
401 Loc = DS.getRestrictSpecLoc();
403 TheSema.Diag(Loc, diag::warn_typecheck_function_qualifiers)
404 << Result << DS.getSourceRange();
408 // Cv-qualified references are ill-formed except when the
409 // cv-qualifiers are introduced through the use of a typedef
410 // (7.1.3) or of a template type argument (14.3), in which
411 // case the cv-qualifiers are ignored.
412 // FIXME: Shouldn't we be checking SCS_typedef here?
413 if (DS.getTypeSpecType() == DeclSpec::TST_typename &&
414 TypeQuals && Result->isReferenceType()) {
415 TypeQuals &= ~DeclSpec::TQ_const;
416 TypeQuals &= ~DeclSpec::TQ_volatile;
419 Qualifiers Quals = Qualifiers::fromCVRMask(TypeQuals);
420 Result = Context.getQualifiedType(Result, Quals);
426 static std::string getPrintableNameForEntity(DeclarationName Entity) {
428 return Entity.getAsString();
433 /// \brief Build a pointer type.
435 /// \param T The type to which we'll be building a pointer.
437 /// \param Quals The cvr-qualifiers to be applied to the pointer type.
439 /// \param Loc The location of the entity whose type involves this
440 /// pointer type or, if there is no such entity, the location of the
441 /// type that will have pointer type.
443 /// \param Entity The name of the entity that involves the pointer
446 /// \returns A suitable pointer type, if there are no
447 /// errors. Otherwise, returns a NULL type.
448 QualType Sema::BuildPointerType(QualType T, unsigned Quals,
449 SourceLocation Loc, DeclarationName Entity) {
450 if (T->isReferenceType()) {
451 // C++ 8.3.2p4: There shall be no ... pointers to references ...
452 Diag(Loc, diag::err_illegal_decl_pointer_to_reference)
453 << getPrintableNameForEntity(Entity) << T;
457 Qualifiers Qs = Qualifiers::fromCVRMask(Quals);
459 // Enforce C99 6.7.3p2: "Types other than pointer types derived from
460 // object or incomplete types shall not be restrict-qualified."
461 if (Qs.hasRestrict() && !T->isIncompleteOrObjectType()) {
462 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee)
467 // Build the pointer type.
468 return Context.getQualifiedType(Context.getPointerType(T), Qs);
471 /// \brief Build a reference type.
473 /// \param T The type to which we'll be building a reference.
475 /// \param CVR The cvr-qualifiers to be applied to the reference type.
477 /// \param Loc The location of the entity whose type involves this
478 /// reference type or, if there is no such entity, the location of the
479 /// type that will have reference type.
481 /// \param Entity The name of the entity that involves the reference
484 /// \returns A suitable reference type, if there are no
485 /// errors. Otherwise, returns a NULL type.
486 QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue,
487 unsigned CVR, SourceLocation Loc,
488 DeclarationName Entity) {
489 Qualifiers Quals = Qualifiers::fromCVRMask(CVR);
491 bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>();
493 // C++0x [dcl.typedef]p9: If a typedef TD names a type that is a
494 // reference to a type T, and attempt to create the type "lvalue
495 // reference to cv TD" creates the type "lvalue reference to T".
496 // We use the qualifiers (restrict or none) of the original reference,
497 // not the new ones. This is consistent with GCC.
499 // C++ [dcl.ref]p4: There shall be no references to references.
501 // According to C++ DR 106, references to references are only
502 // diagnosed when they are written directly (e.g., "int & &"),
503 // but not when they happen via a typedef:
505 // typedef int& intref;
506 // typedef intref& intref2;
508 // Parser::ParseDeclaratorInternal diagnoses the case where
509 // references are written directly; here, we handle the
510 // collapsing of references-to-references as described in C++
511 // DR 106 and amended by C++ DR 540.
514 // A declarator that specifies the type "reference to cv void"
516 if (T->isVoidType()) {
517 Diag(Loc, diag::err_reference_to_void);
521 // Enforce C99 6.7.3p2: "Types other than pointer types derived from
522 // object or incomplete types shall not be restrict-qualified."
523 if (Quals.hasRestrict() && !T->isIncompleteOrObjectType()) {
524 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee)
526 Quals.removeRestrict();
530 // [...] Cv-qualified references are ill-formed except when the
531 // cv-qualifiers are introduced through the use of a typedef
532 // (7.1.3) or of a template type argument (14.3), in which case
533 // the cv-qualifiers are ignored.
535 // We diagnose extraneous cv-qualifiers for the non-typedef,
536 // non-template type argument case within the parser. Here, we just
537 // ignore any extraneous cv-qualifiers.
539 Quals.removeVolatile();
541 // Handle restrict on references.
543 return Context.getQualifiedType(
544 Context.getLValueReferenceType(T, SpelledAsLValue), Quals);
545 return Context.getQualifiedType(Context.getRValueReferenceType(T), Quals);
548 /// \brief Build an array type.
550 /// \param T The type of each element in the array.
552 /// \param ASM C99 array size modifier (e.g., '*', 'static').
554 /// \param ArraySize Expression describing the size of the array.
556 /// \param Quals The cvr-qualifiers to be applied to the array's
559 /// \param Loc The location of the entity whose type involves this
560 /// array type or, if there is no such entity, the location of the
561 /// type that will have array type.
563 /// \param Entity The name of the entity that involves the array
566 /// \returns A suitable array type, if there are no errors. Otherwise,
567 /// returns a NULL type.
568 QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM,
569 Expr *ArraySize, unsigned Quals,
570 SourceRange Brackets, DeclarationName Entity) {
572 SourceLocation Loc = Brackets.getBegin();
573 // C99 6.7.5.2p1: If the element type is an incomplete or function type,
574 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]())
575 // Not in C++, though. There we only dislike void.
576 if (getLangOptions().CPlusPlus) {
577 if (T->isVoidType()) {
578 Diag(Loc, diag::err_illegal_decl_array_incomplete_type) << T;
582 if (RequireCompleteType(Loc, T,
583 diag::err_illegal_decl_array_incomplete_type))
587 if (T->isFunctionType()) {
588 Diag(Loc, diag::err_illegal_decl_array_of_functions)
589 << getPrintableNameForEntity(Entity) << T;
593 // C++ 8.3.2p4: There shall be no ... arrays of references ...
594 if (T->isReferenceType()) {
595 Diag(Loc, diag::err_illegal_decl_array_of_references)
596 << getPrintableNameForEntity(Entity) << T;
600 if (Context.getCanonicalType(T) == Context.UndeducedAutoTy) {
601 Diag(Loc, diag::err_illegal_decl_array_of_auto)
602 << getPrintableNameForEntity(Entity);
606 if (const RecordType *EltTy = T->getAs<RecordType>()) {
607 // If the element type is a struct or union that contains a variadic
608 // array, accept it as a GNU extension: C99 6.7.2.1p2.
609 if (EltTy->getDecl()->hasFlexibleArrayMember())
610 Diag(Loc, diag::ext_flexible_array_in_array) << T;
611 } else if (T->isObjCInterfaceType()) {
612 Diag(Loc, diag::err_objc_array_of_interfaces) << T;
616 // C99 6.7.5.2p1: The size expression shall have integer type.
617 if (ArraySize && !ArraySize->isTypeDependent() &&
618 !ArraySize->getType()->isIntegerType()) {
619 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int)
620 << ArraySize->getType() << ArraySize->getSourceRange();
621 ArraySize->Destroy(Context);
624 llvm::APSInt ConstVal(32);
626 if (ASM == ArrayType::Star)
627 T = Context.getVariableArrayType(T, 0, ASM, Quals, Brackets);
629 T = Context.getIncompleteArrayType(T, ASM, Quals);
630 } else if (ArraySize->isValueDependent()) {
631 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets);
632 } else if (!ArraySize->isIntegerConstantExpr(ConstVal, Context) ||
633 (!T->isDependentType() && !T->isIncompleteType() &&
634 !T->isConstantSizeType())) {
635 // Per C99, a variable array is an array with either a non-constant
636 // size or an element type that has a non-constant-size
637 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets);
639 // C99 6.7.5.2p1: If the expression is a constant expression, it shall
640 // have a value greater than zero.
641 if (ConstVal.isSigned() && ConstVal.isNegative()) {
642 Diag(ArraySize->getLocStart(),
643 diag::err_typecheck_negative_array_size)
644 << ArraySize->getSourceRange();
648 // GCC accepts zero sized static arrays.
649 Diag(ArraySize->getLocStart(), diag::ext_typecheck_zero_array_size)
650 << ArraySize->getSourceRange();
652 T = Context.getConstantArrayType(T, ConstVal, ASM, Quals);
654 // If this is not C99, extwarn about VLA's and C99 array size modifiers.
655 if (!getLangOptions().C99) {
656 if (ArraySize && !ArraySize->isTypeDependent() &&
657 !ArraySize->isValueDependent() &&
658 !ArraySize->isIntegerConstantExpr(Context))
659 Diag(Loc, getLangOptions().CPlusPlus? diag::err_vla_cxx : diag::ext_vla);
660 else if (ASM != ArrayType::Normal || Quals != 0)
662 getLangOptions().CPlusPlus? diag::err_c99_array_usage_cxx
663 : diag::ext_c99_array_usage);
669 /// \brief Build an ext-vector type.
671 /// Run the required checks for the extended vector type.
672 QualType Sema::BuildExtVectorType(QualType T, ExprArg ArraySize,
673 SourceLocation AttrLoc) {
675 Expr *Arg = (Expr *)ArraySize.get();
677 // unlike gcc's vector_size attribute, we do not allow vectors to be defined
678 // in conjunction with complex types (pointers, arrays, functions, etc.).
679 if (!T->isDependentType() &&
680 !T->isIntegerType() && !T->isRealFloatingType()) {
681 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T;
685 if (!Arg->isTypeDependent() && !Arg->isValueDependent()) {
686 llvm::APSInt vecSize(32);
687 if (!Arg->isIntegerConstantExpr(vecSize, Context)) {
688 Diag(AttrLoc, diag::err_attribute_argument_not_int)
689 << "ext_vector_type" << Arg->getSourceRange();
693 // unlike gcc's vector_size attribute, the size is specified as the
694 // number of elements, not the number of bytes.
695 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue());
697 if (vectorSize == 0) {
698 Diag(AttrLoc, diag::err_attribute_zero_size)
699 << Arg->getSourceRange();
703 if (!T->isDependentType())
704 return Context.getExtVectorType(T, vectorSize);
707 return Context.getDependentSizedExtVectorType(T, ArraySize.takeAs<Expr>(),
711 /// \brief Build a function type.
713 /// This routine checks the function type according to C++ rules and
714 /// under the assumption that the result type and parameter types have
715 /// just been instantiated from a template. It therefore duplicates
716 /// some of the behavior of GetTypeForDeclarator, but in a much
717 /// simpler form that is only suitable for this narrow use case.
719 /// \param T The return type of the function.
721 /// \param ParamTypes The parameter types of the function. This array
722 /// will be modified to account for adjustments to the types of the
723 /// function parameters.
725 /// \param NumParamTypes The number of parameter types in ParamTypes.
727 /// \param Variadic Whether this is a variadic function type.
729 /// \param Quals The cvr-qualifiers to be applied to the function type.
731 /// \param Loc The location of the entity whose type involves this
732 /// function type or, if there is no such entity, the location of the
733 /// type that will have function type.
735 /// \param Entity The name of the entity that involves the function
738 /// \returns A suitable function type, if there are no
739 /// errors. Otherwise, returns a NULL type.
740 QualType Sema::BuildFunctionType(QualType T,
741 QualType *ParamTypes,
742 unsigned NumParamTypes,
743 bool Variadic, unsigned Quals,
744 SourceLocation Loc, DeclarationName Entity) {
745 if (T->isArrayType() || T->isFunctionType()) {
746 Diag(Loc, diag::err_func_returning_array_function)
747 << T->isFunctionType() << T;
751 bool Invalid = false;
752 for (unsigned Idx = 0; Idx < NumParamTypes; ++Idx) {
753 QualType ParamType = adjustParameterType(ParamTypes[Idx]);
754 if (ParamType->isVoidType()) {
755 Diag(Loc, diag::err_param_with_void_type);
759 ParamTypes[Idx] = ParamType;
765 return Context.getFunctionType(T, ParamTypes, NumParamTypes, Variadic,
769 /// \brief Build a member pointer type \c T Class::*.
771 /// \param T the type to which the member pointer refers.
772 /// \param Class the class type into which the member pointer points.
773 /// \param CVR Qualifiers applied to the member pointer type
774 /// \param Loc the location where this type begins
775 /// \param Entity the name of the entity that will have this member pointer type
777 /// \returns a member pointer type, if successful, or a NULL type if there was
779 QualType Sema::BuildMemberPointerType(QualType T, QualType Class,
780 unsigned CVR, SourceLocation Loc,
781 DeclarationName Entity) {
782 Qualifiers Quals = Qualifiers::fromCVRMask(CVR);
784 // Verify that we're not building a pointer to pointer to function with
785 // exception specification.
786 if (CheckDistantExceptionSpec(T)) {
787 Diag(Loc, diag::err_distant_exception_spec);
789 // FIXME: If we're doing this as part of template instantiation,
790 // we should return immediately.
792 // Build the type anyway, but use the canonical type so that the
793 // exception specifiers are stripped off.
794 T = Context.getCanonicalType(T);
797 // C++ 8.3.3p3: A pointer to member shall not pointer to ... a member
798 // with reference type, or "cv void."
799 if (T->isReferenceType()) {
800 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference)
801 << (Entity? Entity.getAsString() : "type name") << T;
805 if (T->isVoidType()) {
806 Diag(Loc, diag::err_illegal_decl_mempointer_to_void)
807 << (Entity? Entity.getAsString() : "type name");
811 // Enforce C99 6.7.3p2: "Types other than pointer types derived from
812 // object or incomplete types shall not be restrict-qualified."
813 if (Quals.hasRestrict() && !T->isIncompleteOrObjectType()) {
814 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee)
817 // FIXME: If we're doing this as part of template instantiation,
818 // we should return immediately.
819 Quals.removeRestrict();
822 if (!Class->isDependentType() && !Class->isRecordType()) {
823 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class;
827 return Context.getQualifiedType(
828 Context.getMemberPointerType(T, Class.getTypePtr()), Quals);
831 /// \brief Build a block pointer type.
833 /// \param T The type to which we'll be building a block pointer.
835 /// \param CVR The cvr-qualifiers to be applied to the block pointer type.
837 /// \param Loc The location of the entity whose type involves this
838 /// block pointer type or, if there is no such entity, the location of the
839 /// type that will have block pointer type.
841 /// \param Entity The name of the entity that involves the block pointer
844 /// \returns A suitable block pointer type, if there are no
845 /// errors. Otherwise, returns a NULL type.
846 QualType Sema::BuildBlockPointerType(QualType T, unsigned CVR,
848 DeclarationName Entity) {
849 if (!T->isFunctionType()) {
850 Diag(Loc, diag::err_nonfunction_block_type);
854 Qualifiers Quals = Qualifiers::fromCVRMask(CVR);
855 return Context.getQualifiedType(Context.getBlockPointerType(T), Quals);
858 QualType Sema::GetTypeFromParser(TypeTy *Ty, TypeSourceInfo **TInfo) {
859 QualType QT = QualType::getFromOpaquePtr(Ty);
861 if (TInfo) *TInfo = 0;
865 TypeSourceInfo *DI = 0;
866 if (LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) {
868 DI = LIT->getTypeSourceInfo();
871 if (TInfo) *TInfo = DI;
875 /// GetTypeForDeclarator - Convert the type for the specified
876 /// declarator to Type instances.
878 /// If OwnedDecl is non-NULL, and this declarator's decl-specifier-seq
879 /// owns the declaration of a type (e.g., the definition of a struct
880 /// type), then *OwnedDecl will receive the owned declaration.
881 QualType Sema::GetTypeForDeclarator(Declarator &D, Scope *S,
882 TypeSourceInfo **TInfo,
883 TagDecl **OwnedDecl) {
884 // Determine the type of the declarator. Not all forms of declarator
888 switch (D.getName().getKind()) {
889 case UnqualifiedId::IK_Identifier:
890 case UnqualifiedId::IK_OperatorFunctionId:
891 case UnqualifiedId::IK_LiteralOperatorId:
892 case UnqualifiedId::IK_TemplateId:
893 T = ConvertDeclSpecToType(D, *this);
895 if (!D.isInvalidType() && OwnedDecl && D.getDeclSpec().isTypeSpecOwned())
896 *OwnedDecl = cast<TagDecl>((Decl *)D.getDeclSpec().getTypeRep());
899 case UnqualifiedId::IK_ConstructorName:
900 case UnqualifiedId::IK_ConstructorTemplateId:
901 case UnqualifiedId::IK_DestructorName:
902 // Constructors and destructors don't have return types. Use
907 case UnqualifiedId::IK_ConversionFunctionId:
908 // The result type of a conversion function is the type that it
910 T = GetTypeFromParser(D.getName().ConversionFunctionId);
917 if (T == Context.UndeducedAutoTy) {
920 switch (D.getContext()) {
921 case Declarator::KNRTypeListContext:
922 assert(0 && "K&R type lists aren't allowed in C++");
924 case Declarator::PrototypeContext:
925 Error = 0; // Function prototype
927 case Declarator::MemberContext:
928 switch (cast<TagDecl>(CurContext)->getTagKind()) {
929 case TagDecl::TK_enum: assert(0 && "unhandled tag kind"); break;
930 case TagDecl::TK_struct: Error = 1; /* Struct member */ break;
931 case TagDecl::TK_union: Error = 2; /* Union member */ break;
932 case TagDecl::TK_class: Error = 3; /* Class member */ break;
935 case Declarator::CXXCatchContext:
936 Error = 4; // Exception declaration
938 case Declarator::TemplateParamContext:
939 Error = 5; // Template parameter
941 case Declarator::BlockLiteralContext:
942 Error = 6; // Block literal
944 case Declarator::FileContext:
945 case Declarator::BlockContext:
946 case Declarator::ForContext:
947 case Declarator::ConditionContext:
948 case Declarator::TypeNameContext:
953 Diag(D.getDeclSpec().getTypeSpecTypeLoc(), diag::err_auto_not_allowed)
956 D.setInvalidType(true);
960 // The name we're declaring, if any.
961 DeclarationName Name;
962 if (D.getIdentifier())
963 Name = D.getIdentifier();
965 // Walk the DeclTypeInfo, building the recursive type as we go.
966 // DeclTypeInfos are ordered from the identifier out, which is
967 // opposite of what we want :).
968 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
969 DeclaratorChunk &DeclType = D.getTypeObject(e-i-1);
970 switch (DeclType.Kind) {
971 default: assert(0 && "Unknown decltype!");
972 case DeclaratorChunk::BlockPointer:
973 // If blocks are disabled, emit an error.
974 if (!LangOpts.Blocks)
975 Diag(DeclType.Loc, diag::err_blocks_disable);
977 T = BuildBlockPointerType(T, DeclType.Cls.TypeQuals, D.getIdentifierLoc(),
980 case DeclaratorChunk::Pointer:
981 // Verify that we're not building a pointer to pointer to function with
982 // exception specification.
983 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) {
984 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec);
985 D.setInvalidType(true);
986 // Build the type anyway.
988 if (getLangOptions().ObjC1 && T->isObjCInterfaceType()) {
989 const ObjCInterfaceType *OIT = T->getAs<ObjCInterfaceType>();
990 T = Context.getObjCObjectPointerType(T,
991 (ObjCProtocolDecl **)OIT->qual_begin(),
992 OIT->getNumProtocols());
995 T = BuildPointerType(T, DeclType.Ptr.TypeQuals, DeclType.Loc, Name);
997 case DeclaratorChunk::Reference: {
999 if (DeclType.Ref.HasRestrict) Quals.addRestrict();
1001 // Verify that we're not building a reference to pointer to function with
1002 // exception specification.
1003 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) {
1004 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec);
1005 D.setInvalidType(true);
1006 // Build the type anyway.
1008 T = BuildReferenceType(T, DeclType.Ref.LValueRef, Quals,
1009 DeclType.Loc, Name);
1012 case DeclaratorChunk::Array: {
1013 // Verify that we're not building an array of pointers to function with
1014 // exception specification.
1015 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) {
1016 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec);
1017 D.setInvalidType(true);
1018 // Build the type anyway.
1020 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr;
1021 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts);
1022 ArrayType::ArraySizeModifier ASM;
1024 ASM = ArrayType::Star;
1025 else if (ATI.hasStatic)
1026 ASM = ArrayType::Static;
1028 ASM = ArrayType::Normal;
1029 if (ASM == ArrayType::Star &&
1030 D.getContext() != Declarator::PrototypeContext) {
1031 // FIXME: This check isn't quite right: it allows star in prototypes
1032 // for function definitions, and disallows some edge cases detailed
1033 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html
1034 Diag(DeclType.Loc, diag::err_array_star_outside_prototype);
1035 ASM = ArrayType::Normal;
1036 D.setInvalidType(true);
1038 T = BuildArrayType(T, ASM, ArraySize,
1039 Qualifiers::fromCVRMask(ATI.TypeQuals),
1040 SourceRange(DeclType.Loc, DeclType.EndLoc), Name);
1043 case DeclaratorChunk::Function: {
1044 // If the function declarator has a prototype (i.e. it is not () and
1045 // does not have a K&R-style identifier list), then the arguments are part
1046 // of the type, otherwise the argument list is ().
1047 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun;
1049 // C99 6.7.5.3p1: The return type may not be a function or array type.
1050 // For conversion functions, we'll diagnose this particular error later.
1051 if ((T->isArrayType() || T->isFunctionType()) &&
1052 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId)) {
1053 Diag(DeclType.Loc, diag::err_func_returning_array_function)
1054 << T->isFunctionType() << T;
1056 D.setInvalidType(true);
1059 if (getLangOptions().CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) {
1061 // Types shall not be defined in return or parameter types.
1062 TagDecl *Tag = cast<TagDecl>((Decl *)D.getDeclSpec().getTypeRep());
1063 if (Tag->isDefinition())
1064 Diag(Tag->getLocation(), diag::err_type_defined_in_result_type)
1065 << Context.getTypeDeclType(Tag);
1068 // Exception specs are not allowed in typedefs. Complain, but add it
1070 if (FTI.hasExceptionSpec &&
1071 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef)
1072 Diag(FTI.getThrowLoc(), diag::err_exception_spec_in_typedef);
1074 if (FTI.NumArgs == 0) {
1075 if (getLangOptions().CPlusPlus) {
1076 // C++ 8.3.5p2: If the parameter-declaration-clause is empty, the
1077 // function takes no arguments.
1078 llvm::SmallVector<QualType, 4> Exceptions;
1079 Exceptions.reserve(FTI.NumExceptions);
1080 for (unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) {
1081 // FIXME: Preserve type source info.
1082 QualType ET = GetTypeFromParser(FTI.Exceptions[ei].Ty);
1083 // Check that the type is valid for an exception spec, and drop it
1085 if (!CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range))
1086 Exceptions.push_back(ET);
1088 T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic, FTI.TypeQuals,
1089 FTI.hasExceptionSpec,
1090 FTI.hasAnyExceptionSpec,
1091 Exceptions.size(), Exceptions.data());
1092 } else if (FTI.isVariadic) {
1093 // We allow a zero-parameter variadic function in C if the
1094 // function is marked with the "overloadable"
1095 // attribute. Scan for this attribute now.
1096 bool Overloadable = false;
1097 for (const AttributeList *Attrs = D.getAttributes();
1098 Attrs; Attrs = Attrs->getNext()) {
1099 if (Attrs->getKind() == AttributeList::AT_overloadable) {
1100 Overloadable = true;
1106 Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg);
1107 T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic, 0);
1109 // Simple void foo(), where the incoming T is the result type.
1110 T = Context.getFunctionNoProtoType(T);
1112 } else if (FTI.ArgInfo[0].Param == 0) {
1113 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function definition.
1114 Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration);
1115 D.setInvalidType(true);
1117 // Otherwise, we have a function with an argument list that is
1118 // potentially variadic.
1119 llvm::SmallVector<QualType, 16> ArgTys;
1121 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) {
1122 ParmVarDecl *Param =
1123 cast<ParmVarDecl>(FTI.ArgInfo[i].Param.getAs<Decl>());
1124 QualType ArgTy = Param->getType();
1125 assert(!ArgTy.isNull() && "Couldn't parse type?");
1127 // Adjust the parameter type.
1128 assert((ArgTy == adjustParameterType(ArgTy)) && "Unadjusted type?");
1130 // Look for 'void'. void is allowed only as a single argument to a
1131 // function with no other parameters (C99 6.7.5.3p10). We record
1132 // int(void) as a FunctionProtoType with an empty argument list.
1133 if (ArgTy->isVoidType()) {
1134 // If this is something like 'float(int, void)', reject it. 'void'
1135 // is an incomplete type (C99 6.2.5p19) and function decls cannot
1136 // have arguments of incomplete type.
1137 if (FTI.NumArgs != 1 || FTI.isVariadic) {
1138 Diag(DeclType.Loc, diag::err_void_only_param);
1139 ArgTy = Context.IntTy;
1140 Param->setType(ArgTy);
1141 } else if (FTI.ArgInfo[i].Ident) {
1142 // Reject, but continue to parse 'int(void abc)'.
1143 Diag(FTI.ArgInfo[i].IdentLoc,
1144 diag::err_param_with_void_type);
1145 ArgTy = Context.IntTy;
1146 Param->setType(ArgTy);
1148 // Reject, but continue to parse 'float(const void)'.
1149 if (ArgTy.hasQualifiers())
1150 Diag(DeclType.Loc, diag::err_void_param_qualified);
1152 // Do not add 'void' to the ArgTys list.
1155 } else if (!FTI.hasPrototype) {
1156 if (ArgTy->isPromotableIntegerType()) {
1157 ArgTy = Context.getPromotedIntegerType(ArgTy);
1158 } else if (const BuiltinType* BTy = ArgTy->getAs<BuiltinType>()) {
1159 if (BTy->getKind() == BuiltinType::Float)
1160 ArgTy = Context.DoubleTy;
1164 ArgTys.push_back(ArgTy);
1167 llvm::SmallVector<QualType, 4> Exceptions;
1168 Exceptions.reserve(FTI.NumExceptions);
1169 for (unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) {
1170 // FIXME: Preserve type source info.
1171 QualType ET = GetTypeFromParser(FTI.Exceptions[ei].Ty);
1172 // Check that the type is valid for an exception spec, and drop it if
1174 if (!CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range))
1175 Exceptions.push_back(ET);
1178 T = Context.getFunctionType(T, ArgTys.data(), ArgTys.size(),
1179 FTI.isVariadic, FTI.TypeQuals,
1180 FTI.hasExceptionSpec,
1181 FTI.hasAnyExceptionSpec,
1182 Exceptions.size(), Exceptions.data());
1186 case DeclaratorChunk::MemberPointer:
1187 // Verify that we're not building a pointer to pointer to function with
1188 // exception specification.
1189 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) {
1190 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec);
1191 D.setInvalidType(true);
1192 // Build the type anyway.
1194 // The scope spec must refer to a class, or be dependent.
1196 if (isDependentScopeSpecifier(DeclType.Mem.Scope())
1197 || dyn_cast_or_null<CXXRecordDecl>(
1198 computeDeclContext(DeclType.Mem.Scope()))) {
1199 NestedNameSpecifier *NNS
1200 = (NestedNameSpecifier *)DeclType.Mem.Scope().getScopeRep();
1201 NestedNameSpecifier *NNSPrefix = NNS->getPrefix();
1202 switch (NNS->getKind()) {
1203 case NestedNameSpecifier::Identifier:
1204 ClsType = Context.getTypenameType(NNSPrefix, NNS->getAsIdentifier());
1207 case NestedNameSpecifier::Namespace:
1208 case NestedNameSpecifier::Global:
1209 llvm_unreachable("Nested-name-specifier must name a type");
1212 case NestedNameSpecifier::TypeSpec:
1213 case NestedNameSpecifier::TypeSpecWithTemplate:
1214 ClsType = QualType(NNS->getAsType(), 0);
1216 ClsType = Context.getQualifiedNameType(NNSPrefix, ClsType);
1220 Diag(DeclType.Mem.Scope().getBeginLoc(),
1221 diag::err_illegal_decl_mempointer_in_nonclass)
1222 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name")
1223 << DeclType.Mem.Scope().getRange();
1224 D.setInvalidType(true);
1227 if (!ClsType.isNull())
1228 T = BuildMemberPointerType(T, ClsType, DeclType.Mem.TypeQuals,
1229 DeclType.Loc, D.getIdentifier());
1232 D.setInvalidType(true);
1238 D.setInvalidType(true);
1242 // See if there are any attributes on this declarator chunk.
1243 if (const AttributeList *AL = DeclType.getAttrs())
1244 ProcessTypeAttributeList(T, AL);
1247 if (getLangOptions().CPlusPlus && T->isFunctionType()) {
1248 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>();
1249 assert(FnTy && "Why oh why is there not a FunctionProtoType here?");
1251 // C++ 8.3.5p4: A cv-qualifier-seq shall only be part of the function type
1252 // for a nonstatic member function, the function type to which a pointer
1253 // to member refers, or the top-level function type of a function typedef
1255 if (FnTy->getTypeQuals() != 0 &&
1256 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef &&
1257 ((D.getContext() != Declarator::MemberContext &&
1258 (!D.getCXXScopeSpec().isSet() ||
1259 !computeDeclContext(D.getCXXScopeSpec(), /*FIXME:*/true)
1261 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static)) {
1262 if (D.isFunctionDeclarator())
1263 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_function_type);
1265 Diag(D.getIdentifierLoc(),
1266 diag::err_invalid_qualified_typedef_function_type_use);
1268 // Strip the cv-quals from the type.
1269 T = Context.getFunctionType(FnTy->getResultType(), FnTy->arg_type_begin(),
1270 FnTy->getNumArgs(), FnTy->isVariadic(), 0);
1274 // If there were any type attributes applied to the decl itself (not the
1275 // type, apply the type attribute to the type!)
1276 if (const AttributeList *Attrs = D.getAttributes())
1277 ProcessTypeAttributeList(T, Attrs);
1280 if (D.isInvalidType())
1283 *TInfo = GetTypeSourceInfoForDeclarator(D, T);
1290 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> {
1294 TypeSpecLocFiller(const DeclSpec &DS) : DS(DS) {}
1296 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) {
1297 Visit(TL.getUnqualifiedLoc());
1299 void VisitTypedefTypeLoc(TypedefTypeLoc TL) {
1300 TL.setNameLoc(DS.getTypeSpecTypeLoc());
1302 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) {
1303 TL.setNameLoc(DS.getTypeSpecTypeLoc());
1305 if (DS.getProtocolQualifiers()) {
1306 assert(TL.getNumProtocols() > 0);
1307 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers());
1308 TL.setLAngleLoc(DS.getProtocolLAngleLoc());
1309 TL.setRAngleLoc(DS.getSourceRange().getEnd());
1310 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i)
1311 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]);
1313 assert(TL.getNumProtocols() == 0);
1314 TL.setLAngleLoc(SourceLocation());
1315 TL.setRAngleLoc(SourceLocation());
1318 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) {
1319 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers());
1321 TL.setStarLoc(SourceLocation());
1323 if (DS.getProtocolQualifiers()) {
1324 assert(TL.getNumProtocols() > 0);
1325 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers());
1326 TL.setHasProtocolsAsWritten(true);
1327 TL.setLAngleLoc(DS.getProtocolLAngleLoc());
1328 TL.setRAngleLoc(DS.getSourceRange().getEnd());
1329 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i)
1330 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]);
1333 assert(TL.getNumProtocols() == 0);
1334 TL.setHasProtocolsAsWritten(false);
1335 TL.setLAngleLoc(SourceLocation());
1336 TL.setRAngleLoc(SourceLocation());
1339 // This might not have been written with an inner type.
1340 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) {
1341 TL.setHasBaseTypeAsWritten(false);
1342 TL.getBaseTypeLoc().initialize(SourceLocation());
1344 TL.setHasBaseTypeAsWritten(true);
1345 Visit(TL.getBaseTypeLoc());
1348 void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) {
1349 TypeSourceInfo *TInfo = 0;
1350 Sema::GetTypeFromParser(DS.getTypeRep(), &TInfo);
1352 // If we got no declarator info from previous Sema routines,
1353 // just fill with the typespec loc.
1355 TL.initialize(DS.getTypeSpecTypeLoc());
1359 TemplateSpecializationTypeLoc OldTL =
1360 cast<TemplateSpecializationTypeLoc>(TInfo->getTypeLoc());
1363 void VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) {
1364 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofExpr);
1365 TL.setTypeofLoc(DS.getTypeSpecTypeLoc());
1366 TL.setParensRange(DS.getTypeofParensRange());
1368 void VisitTypeOfTypeLoc(TypeOfTypeLoc TL) {
1369 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofType);
1370 TL.setTypeofLoc(DS.getTypeSpecTypeLoc());
1371 TL.setParensRange(DS.getTypeofParensRange());
1372 assert(DS.getTypeRep());
1373 TypeSourceInfo *TInfo = 0;
1374 Sema::GetTypeFromParser(DS.getTypeRep(), &TInfo);
1375 TL.setUnderlyingTInfo(TInfo);
1377 void VisitBuiltinTypeLoc(BuiltinTypeLoc TL) {
1378 // By default, use the source location of the type specifier.
1379 TL.setBuiltinLoc(DS.getTypeSpecTypeLoc());
1380 if (TL.needsExtraLocalData()) {
1381 // Set info for the written builtin specifiers.
1382 TL.getWrittenBuiltinSpecs() = DS.getWrittenBuiltinSpecs();
1383 // Try to have a meaningful source location.
1384 if (TL.getWrittenSignSpec() != TSS_unspecified)
1385 // Sign spec loc overrides the others (e.g., 'unsigned long').
1386 TL.setBuiltinLoc(DS.getTypeSpecSignLoc());
1387 else if (TL.getWrittenWidthSpec() != TSW_unspecified)
1388 // Width spec loc overrides type spec loc (e.g., 'short int').
1389 TL.setBuiltinLoc(DS.getTypeSpecWidthLoc());
1392 void VisitTypeLoc(TypeLoc TL) {
1393 // FIXME: add other typespec types and change this to an assert.
1394 TL.initialize(DS.getTypeSpecTypeLoc());
1398 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> {
1399 const DeclaratorChunk &Chunk;
1402 DeclaratorLocFiller(const DeclaratorChunk &Chunk) : Chunk(Chunk) {}
1404 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) {
1405 llvm_unreachable("qualified type locs not expected here!");
1408 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) {
1409 assert(Chunk.Kind == DeclaratorChunk::BlockPointer);
1410 TL.setCaretLoc(Chunk.Loc);
1412 void VisitPointerTypeLoc(PointerTypeLoc TL) {
1413 assert(Chunk.Kind == DeclaratorChunk::Pointer);
1414 TL.setStarLoc(Chunk.Loc);
1416 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) {
1417 assert(Chunk.Kind == DeclaratorChunk::Pointer);
1418 TL.setStarLoc(Chunk.Loc);
1419 TL.setHasBaseTypeAsWritten(true);
1420 TL.setHasProtocolsAsWritten(false);
1421 TL.setLAngleLoc(SourceLocation());
1422 TL.setRAngleLoc(SourceLocation());
1424 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) {
1425 assert(Chunk.Kind == DeclaratorChunk::MemberPointer);
1426 TL.setStarLoc(Chunk.Loc);
1427 // FIXME: nested name specifier
1429 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) {
1430 assert(Chunk.Kind == DeclaratorChunk::Reference);
1431 // 'Amp' is misleading: this might have been originally
1432 /// spelled with AmpAmp.
1433 TL.setAmpLoc(Chunk.Loc);
1435 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) {
1436 assert(Chunk.Kind == DeclaratorChunk::Reference);
1437 assert(!Chunk.Ref.LValueRef);
1438 TL.setAmpAmpLoc(Chunk.Loc);
1440 void VisitArrayTypeLoc(ArrayTypeLoc TL) {
1441 assert(Chunk.Kind == DeclaratorChunk::Array);
1442 TL.setLBracketLoc(Chunk.Loc);
1443 TL.setRBracketLoc(Chunk.EndLoc);
1444 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts));
1446 void VisitFunctionTypeLoc(FunctionTypeLoc TL) {
1447 assert(Chunk.Kind == DeclaratorChunk::Function);
1448 TL.setLParenLoc(Chunk.Loc);
1449 TL.setRParenLoc(Chunk.EndLoc);
1451 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun;
1452 for (unsigned i = 0, e = TL.getNumArgs(), tpi = 0; i != e; ++i) {
1453 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>();
1454 TL.setArg(tpi++, Param);
1456 // FIXME: exception specs
1459 void VisitTypeLoc(TypeLoc TL) {
1460 llvm_unreachable("unsupported TypeLoc kind in declarator!");
1465 /// \brief Create and instantiate a TypeSourceInfo with type source information.
1467 /// \param T QualType referring to the type as written in source code.
1469 Sema::GetTypeSourceInfoForDeclarator(Declarator &D, QualType T) {
1470 TypeSourceInfo *TInfo = Context.CreateTypeSourceInfo(T);
1471 UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc();
1473 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
1474 DeclaratorLocFiller(D.getTypeObject(i)).Visit(CurrTL);
1475 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc();
1478 TypeSpecLocFiller(D.getDeclSpec()).Visit(CurrTL);
1483 /// \brief Create a LocInfoType to hold the given QualType and TypeSourceInfo.
1484 QualType Sema::CreateLocInfoType(QualType T, TypeSourceInfo *TInfo) {
1485 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser
1486 // and Sema during declaration parsing. Try deallocating/caching them when
1487 // it's appropriate, instead of allocating them and keeping them around.
1488 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType), 8);
1489 new (LocT) LocInfoType(T, TInfo);
1490 assert(LocT->getTypeClass() != T->getTypeClass() &&
1491 "LocInfoType's TypeClass conflicts with an existing Type class");
1492 return QualType(LocT, 0);
1495 void LocInfoType::getAsStringInternal(std::string &Str,
1496 const PrintingPolicy &Policy) const {
1497 assert(false && "LocInfoType leaked into the type system; an opaque TypeTy*"
1498 " was used directly instead of getting the QualType through"
1499 " GetTypeFromParser");
1502 /// UnwrapSimilarPointerTypes - If T1 and T2 are pointer types that
1503 /// may be similar (C++ 4.4), replaces T1 and T2 with the type that
1504 /// they point to and return true. If T1 and T2 aren't pointer types
1505 /// or pointer-to-member types, or if they are not similar at this
1506 /// level, returns false and leaves T1 and T2 unchanged. Top-level
1507 /// qualifiers on T1 and T2 are ignored. This function will typically
1508 /// be called in a loop that successively "unwraps" pointer and
1509 /// pointer-to-member types to compare them at each level.
1510 bool Sema::UnwrapSimilarPointerTypes(QualType& T1, QualType& T2) {
1511 const PointerType *T1PtrType = T1->getAs<PointerType>(),
1512 *T2PtrType = T2->getAs<PointerType>();
1513 if (T1PtrType && T2PtrType) {
1514 T1 = T1PtrType->getPointeeType();
1515 T2 = T2PtrType->getPointeeType();
1519 const MemberPointerType *T1MPType = T1->getAs<MemberPointerType>(),
1520 *T2MPType = T2->getAs<MemberPointerType>();
1521 if (T1MPType && T2MPType &&
1522 Context.getCanonicalType(T1MPType->getClass()) ==
1523 Context.getCanonicalType(T2MPType->getClass())) {
1524 T1 = T1MPType->getPointeeType();
1525 T2 = T2MPType->getPointeeType();
1531 Sema::TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) {
1532 // C99 6.7.6: Type names have no identifier. This is already validated by
1534 assert(D.getIdentifier() == 0 && "Type name should have no identifier!");
1536 TypeSourceInfo *TInfo = 0;
1537 TagDecl *OwnedTag = 0;
1538 QualType T = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag);
1539 if (D.isInvalidType())
1542 if (getLangOptions().CPlusPlus) {
1543 // Check that there are no default arguments (C++ only).
1544 CheckExtraCXXDefaultArguments(D);
1546 // C++0x [dcl.type]p3:
1547 // A type-specifier-seq shall not define a class or enumeration
1548 // unless it appears in the type-id of an alias-declaration
1550 if (OwnedTag && OwnedTag->isDefinition())
1551 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_type_specifier)
1552 << Context.getTypeDeclType(OwnedTag);
1556 T = CreateLocInfoType(T, TInfo);
1558 return T.getAsOpaquePtr();
1563 //===----------------------------------------------------------------------===//
1564 // Type Attribute Processing
1565 //===----------------------------------------------------------------------===//
1567 /// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the
1568 /// specified type. The attribute contains 1 argument, the id of the address
1569 /// space for the type.
1570 static void HandleAddressSpaceTypeAttribute(QualType &Type,
1571 const AttributeList &Attr, Sema &S){
1573 // If this type is already address space qualified, reject it.
1574 // Clause 6.7.3 - Type qualifiers: "No type shall be qualified by qualifiers
1575 // for two or more different address spaces."
1576 if (Type.getAddressSpace()) {
1577 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers);
1581 // Check the attribute arguments.
1582 if (Attr.getNumArgs() != 1) {
1583 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1;
1586 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0));
1587 llvm::APSInt addrSpace(32);
1588 if (!ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) {
1589 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int)
1590 << ASArgExpr->getSourceRange();
1595 if (addrSpace.isSigned()) {
1596 if (addrSpace.isNegative()) {
1597 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative)
1598 << ASArgExpr->getSourceRange();
1601 addrSpace.setIsSigned(false);
1603 llvm::APSInt max(addrSpace.getBitWidth());
1604 max = Qualifiers::MaxAddressSpace;
1605 if (addrSpace > max) {
1606 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high)
1607 << Qualifiers::MaxAddressSpace << ASArgExpr->getSourceRange();
1611 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue());
1612 Type = S.Context.getAddrSpaceQualType(Type, ASIdx);
1615 /// HandleObjCGCTypeAttribute - Process an objc's gc attribute on the
1616 /// specified type. The attribute contains 1 argument, weak or strong.
1617 static void HandleObjCGCTypeAttribute(QualType &Type,
1618 const AttributeList &Attr, Sema &S) {
1619 if (Type.getObjCGCAttr() != Qualifiers::GCNone) {
1620 S.Diag(Attr.getLoc(), diag::err_attribute_multiple_objc_gc);
1624 // Check the attribute arguments.
1625 if (!Attr.getParameterName()) {
1626 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string)
1630 Qualifiers::GC GCAttr;
1631 if (Attr.getNumArgs() != 0) {
1632 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1;
1635 if (Attr.getParameterName()->isStr("weak"))
1636 GCAttr = Qualifiers::Weak;
1637 else if (Attr.getParameterName()->isStr("strong"))
1638 GCAttr = Qualifiers::Strong;
1640 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported)
1641 << "objc_gc" << Attr.getParameterName();
1645 Type = S.Context.getObjCGCQualType(Type, GCAttr);
1648 /// HandleNoReturnTypeAttribute - Process the noreturn attribute on the
1649 /// specified type. The attribute contains 0 arguments.
1650 static void HandleNoReturnTypeAttribute(QualType &Type,
1651 const AttributeList &Attr, Sema &S) {
1652 if (Attr.getNumArgs() != 0)
1655 // We only apply this to a pointer to function or a pointer to block.
1656 if (!Type->isFunctionPointerType()
1657 && !Type->isBlockPointerType()
1658 && !Type->isFunctionType())
1661 Type = S.Context.getNoReturnType(Type);
1664 /// HandleVectorSizeAttribute - this attribute is only applicable to integral
1665 /// and float scalars, although arrays, pointers, and function return values are
1666 /// allowed in conjunction with this construct. Aggregates with this attribute
1667 /// are invalid, even if they are of the same size as a corresponding scalar.
1668 /// The raw attribute should contain precisely 1 argument, the vector size for
1669 /// the variable, measured in bytes. If curType and rawAttr are well formed,
1670 /// this routine will return a new vector type.
1671 static void HandleVectorSizeAttr(QualType& CurType, const AttributeList &Attr, Sema &S) {
1672 // Check the attribute arugments.
1673 if (Attr.getNumArgs() != 1) {
1674 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1;
1677 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0));
1678 llvm::APSInt vecSize(32);
1679 if (!sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) {
1680 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int)
1681 << "vector_size" << sizeExpr->getSourceRange();
1684 // the base type must be integer or float, and can't already be a vector.
1685 if (CurType->isVectorType() ||
1686 (!CurType->isIntegerType() && !CurType->isRealFloatingType())) {
1687 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType;
1690 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType));
1691 // vecSize is specified in bytes - convert to bits.
1692 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8);
1694 // the vector size needs to be an integral multiple of the type size.
1695 if (vectorSize % typeSize) {
1696 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size)
1697 << sizeExpr->getSourceRange();
1700 if (vectorSize == 0) {
1701 S.Diag(Attr.getLoc(), diag::err_attribute_zero_size)
1702 << sizeExpr->getSourceRange();
1706 // Success! Instantiate the vector type, the number of elements is > 0, and
1707 // not required to be a power of 2, unlike GCC.
1708 CurType = S.Context.getVectorType(CurType, vectorSize/typeSize);
1711 void Sema::ProcessTypeAttributeList(QualType &Result, const AttributeList *AL) {
1712 // Scan through and apply attributes to this type where it makes sense. Some
1713 // attributes (such as __address_space__, __vector_size__, etc) apply to the
1714 // type, but others can be present in the type specifiers even though they
1715 // apply to the decl. Here we apply type attributes and ignore the rest.
1716 for (; AL; AL = AL->getNext()) {
1717 // If this is an attribute we can handle, do so now, otherwise, add it to
1718 // the LeftOverAttrs list for rechaining.
1719 switch (AL->getKind()) {
1721 case AttributeList::AT_address_space:
1722 HandleAddressSpaceTypeAttribute(Result, *AL, *this);
1724 case AttributeList::AT_objc_gc:
1725 HandleObjCGCTypeAttribute(Result, *AL, *this);
1727 case AttributeList::AT_noreturn:
1728 HandleNoReturnTypeAttribute(Result, *AL, *this);
1730 case AttributeList::AT_vector_size:
1731 HandleVectorSizeAttr(Result, *AL, *this);
1737 /// @brief Ensure that the type T is a complete type.
1739 /// This routine checks whether the type @p T is complete in any
1740 /// context where a complete type is required. If @p T is a complete
1741 /// type, returns false. If @p T is a class template specialization,
1742 /// this routine then attempts to perform class template
1743 /// instantiation. If instantiation fails, or if @p T is incomplete
1744 /// and cannot be completed, issues the diagnostic @p diag (giving it
1745 /// the type @p T) and returns true.
1747 /// @param Loc The location in the source that the incomplete type
1748 /// diagnostic should refer to.
1750 /// @param T The type that this routine is examining for completeness.
1752 /// @param PD The partial diagnostic that will be printed out if T is not a
1755 /// @returns @c true if @p T is incomplete and a diagnostic was emitted,
1756 /// @c false otherwise.
1757 bool Sema::RequireCompleteType(SourceLocation Loc, QualType T,
1758 const PartialDiagnostic &PD,
1759 std::pair<SourceLocation,
1760 PartialDiagnostic> Note) {
1761 unsigned diag = PD.getDiagID();
1763 // FIXME: Add this assertion to make sure we always get instantiation points.
1764 // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType");
1765 // FIXME: Add this assertion to help us flush out problems with
1766 // checking for dependent types and type-dependent expressions.
1768 // assert(!T->isDependentType() &&
1769 // "Can't ask whether a dependent type is complete");
1771 // If we have a complete type, we're done.
1772 if (!T->isIncompleteType())
1775 // If we have a class template specialization or a class member of a
1776 // class template specialization, or an array with known size of such,
1777 // try to instantiate it.
1778 QualType MaybeTemplate = T;
1779 if (const ConstantArrayType *Array = Context.getAsConstantArrayType(T))
1780 MaybeTemplate = Array->getElementType();
1781 if (const RecordType *Record = MaybeTemplate->getAs<RecordType>()) {
1782 if (ClassTemplateSpecializationDecl *ClassTemplateSpec
1783 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) {
1784 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared)
1785 return InstantiateClassTemplateSpecialization(Loc, ClassTemplateSpec,
1786 TSK_ImplicitInstantiation,
1787 /*Complain=*/diag != 0);
1788 } else if (CXXRecordDecl *Rec
1789 = dyn_cast<CXXRecordDecl>(Record->getDecl())) {
1790 if (CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass()) {
1791 MemberSpecializationInfo *MSInfo = Rec->getMemberSpecializationInfo();
1792 assert(MSInfo && "Missing member specialization information?");
1793 // This record was instantiated from a class within a template.
1794 if (MSInfo->getTemplateSpecializationKind()
1795 != TSK_ExplicitSpecialization)
1796 return InstantiateClass(Loc, Rec, Pattern,
1797 getTemplateInstantiationArgs(Rec),
1798 TSK_ImplicitInstantiation,
1799 /*Complain=*/diag != 0);
1807 // We have an incomplete type. Produce a diagnostic.
1810 // If we have a note, produce it.
1811 if (!Note.first.isInvalid())
1812 Diag(Note.first, Note.second);
1814 // If the type was a forward declaration of a class/struct/union
1816 const TagType *Tag = 0;
1817 if (const RecordType *Record = T->getAs<RecordType>())
1819 else if (const EnumType *Enum = T->getAs<EnumType>())
1822 if (Tag && !Tag->getDecl()->isInvalidDecl())
1823 Diag(Tag->getDecl()->getLocation(),
1824 Tag->isBeingDefined() ? diag::note_type_being_defined
1825 : diag::note_forward_declaration)
1826 << QualType(Tag, 0);
1831 /// \brief Retrieve a version of the type 'T' that is qualified by the
1832 /// nested-name-specifier contained in SS.
1833 QualType Sema::getQualifiedNameType(const CXXScopeSpec &SS, QualType T) {
1834 if (!SS.isSet() || SS.isInvalid() || T.isNull())
1837 NestedNameSpecifier *NNS
1838 = static_cast<NestedNameSpecifier *>(SS.getScopeRep());
1839 return Context.getQualifiedNameType(NNS, T);
1842 QualType Sema::BuildTypeofExprType(Expr *E) {
1843 if (E->getType() == Context.OverloadTy) {
1844 // C++ [temp.arg.explicit]p3 allows us to resolve a template-id to a
1845 // function template specialization wherever deduction cannot occur.
1846 if (FunctionDecl *Specialization
1847 = ResolveSingleFunctionTemplateSpecialization(E)) {
1848 E = FixOverloadedFunctionReference(E, Specialization);
1852 Diag(E->getLocStart(),
1853 diag::err_cannot_determine_declared_type_of_overloaded_function)
1854 << false << E->getSourceRange();
1859 return Context.getTypeOfExprType(E);
1862 QualType Sema::BuildDecltypeType(Expr *E) {
1863 if (E->getType() == Context.OverloadTy) {
1864 // C++ [temp.arg.explicit]p3 allows us to resolve a template-id to a
1865 // function template specialization wherever deduction cannot occur.
1866 if (FunctionDecl *Specialization
1867 = ResolveSingleFunctionTemplateSpecialization(E)) {
1868 E = FixOverloadedFunctionReference(E, Specialization);
1872 Diag(E->getLocStart(),
1873 diag::err_cannot_determine_declared_type_of_overloaded_function)
1874 << true << E->getSourceRange();
1879 return Context.getDecltypeType(E);