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/Expr.h"
21 #include "clang/Basic/PartialDiagnostic.h"
22 #include "clang/Parse/DeclSpec.h"
23 #include "llvm/ADT/SmallPtrSet.h"
24 using namespace clang;
26 /// \brief Perform adjustment on the parameter type of a function.
28 /// This routine adjusts the given parameter type @p T to the actual
29 /// parameter type used by semantic analysis (C99 6.7.5.3p[7,8],
30 /// C++ [dcl.fct]p3). The adjusted parameter type is returned.
31 QualType Sema::adjustParameterType(QualType T) {
33 if (T->isArrayType()) {
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.
39 return Context.getArrayDecayedType(T);
40 } else if (T->isFunctionType())
42 // A declaration of a parameter as "function returning type"
43 // shall be adjusted to "pointer to function returning type", as
45 return Context.getPointerType(T);
50 /// \brief Convert the specified declspec to the appropriate type
52 /// \param DS the declaration specifiers
53 /// \param DeclLoc The location of the declarator identifier or invalid if none.
54 /// \param SourceTy QualType representing the type as written in source form.
55 /// \returns The type described by the declaration specifiers. This function
56 /// never returns null.
57 QualType Sema::ConvertDeclSpecToType(const DeclSpec &DS,
58 SourceLocation DeclLoc,
59 bool &isInvalid, QualType &SourceTy) {
60 // FIXME: Should move the logic from DeclSpec::Finish to here for validity
65 switch (DS.getTypeSpecType()) {
66 case DeclSpec::TST_void:
67 Result = Context.VoidTy;
69 case DeclSpec::TST_char:
70 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified)
71 Result = Context.CharTy;
72 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed)
73 Result = Context.SignedCharTy;
75 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned &&
77 Result = Context.UnsignedCharTy;
80 case DeclSpec::TST_wchar:
81 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified)
82 Result = Context.WCharTy;
83 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) {
84 Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec)
85 << DS.getSpecifierName(DS.getTypeSpecType());
86 Result = Context.getSignedWCharType();
88 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned &&
90 Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec)
91 << DS.getSpecifierName(DS.getTypeSpecType());
92 Result = Context.getUnsignedWCharType();
95 case DeclSpec::TST_char16:
96 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified &&
98 Result = Context.Char16Ty;
100 case DeclSpec::TST_char32:
101 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified &&
102 "Unknown TSS value");
103 Result = Context.Char32Ty;
105 case DeclSpec::TST_unspecified:
106 // "<proto1,proto2>" is an objc qualified ID with a missing id.
107 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) {
108 SourceTy = Context.getObjCProtocolListType(QualType(),
109 (ObjCProtocolDecl**)PQ,
110 DS.getNumProtocolQualifiers());
111 Result = Context.getObjCObjectPointerType(Context.ObjCBuiltinIdTy,
112 (ObjCProtocolDecl**)PQ,
113 DS.getNumProtocolQualifiers());
117 // Unspecified typespec defaults to int in C90. However, the C90 grammar
118 // [C90 6.5] only allows a decl-spec if there was *some* type-specifier,
119 // type-qualifier, or storage-class-specifier. If not, emit an extwarn.
120 // Note that the one exception to this is function definitions, which are
121 // allowed to be completely missing a declspec. This is handled in the
122 // parser already though by it pretending to have seen an 'int' in this
124 if (getLangOptions().ImplicitInt) {
125 // In C89 mode, we only warn if there is a completely missing declspec
126 // when one is not allowed.
128 if (DeclLoc.isInvalid())
129 DeclLoc = DS.getSourceRange().getBegin();
130 Diag(DeclLoc, diag::ext_missing_declspec)
131 << DS.getSourceRange()
132 << CodeModificationHint::CreateInsertion(DS.getSourceRange().getBegin(),
135 } else if (!DS.hasTypeSpecifier()) {
136 // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says:
137 // "At least one type specifier shall be given in the declaration
138 // specifiers in each declaration, and in the specifier-qualifier list in
139 // each struct declaration and type name."
140 // FIXME: Does Microsoft really have the implicit int extension in C++?
141 if (DeclLoc.isInvalid())
142 DeclLoc = DS.getSourceRange().getBegin();
144 if (getLangOptions().CPlusPlus && !getLangOptions().Microsoft) {
145 Diag(DeclLoc, diag::err_missing_type_specifier)
146 << DS.getSourceRange();
148 // When this occurs in C++ code, often something is very broken with the
149 // value being declared, poison it as invalid so we don't get chains of
153 Diag(DeclLoc, diag::ext_missing_type_specifier)
154 << DS.getSourceRange();
159 case DeclSpec::TST_int: {
160 if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) {
161 switch (DS.getTypeSpecWidth()) {
162 case DeclSpec::TSW_unspecified: Result = Context.IntTy; break;
163 case DeclSpec::TSW_short: Result = Context.ShortTy; break;
164 case DeclSpec::TSW_long: Result = Context.LongTy; break;
165 case DeclSpec::TSW_longlong: Result = Context.LongLongTy; break;
168 switch (DS.getTypeSpecWidth()) {
169 case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break;
170 case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break;
171 case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break;
172 case DeclSpec::TSW_longlong: Result =Context.UnsignedLongLongTy; break;
177 case DeclSpec::TST_float: Result = Context.FloatTy; break;
178 case DeclSpec::TST_double:
179 if (DS.getTypeSpecWidth() == DeclSpec::TSW_long)
180 Result = Context.LongDoubleTy;
182 Result = Context.DoubleTy;
184 case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool
185 case DeclSpec::TST_decimal32: // _Decimal32
186 case DeclSpec::TST_decimal64: // _Decimal64
187 case DeclSpec::TST_decimal128: // _Decimal128
188 Diag(DS.getTypeSpecTypeLoc(), diag::err_decimal_unsupported);
189 Result = Context.IntTy;
192 case DeclSpec::TST_class:
193 case DeclSpec::TST_enum:
194 case DeclSpec::TST_union:
195 case DeclSpec::TST_struct: {
196 Decl *D = static_cast<Decl *>(DS.getTypeRep());
198 // This can happen in C++ with ambiguous lookups.
199 Result = Context.IntTy;
204 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 &&
205 DS.getTypeSpecSign() == 0 &&
206 "Can't handle qualifiers on typedef names yet!");
207 // TypeQuals handled by caller.
208 Result = Context.getTypeDeclType(cast<TypeDecl>(D));
210 // In C++, make an ElaboratedType.
211 if (getLangOptions().CPlusPlus) {
213 = TagDecl::getTagKindForTypeSpec(DS.getTypeSpecType());
214 Result = Context.getElaboratedType(Result, Tag);
217 if (D->isInvalidDecl())
221 case DeclSpec::TST_typename: {
222 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 &&
223 DS.getTypeSpecSign() == 0 &&
224 "Can't handle qualifiers on typedef names yet!");
225 Result = GetTypeFromParser(DS.getTypeRep());
227 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) {
228 SourceTy = Context.getObjCProtocolListType(Result,
229 (ObjCProtocolDecl**)PQ,
230 DS.getNumProtocolQualifiers());
231 if (const ObjCInterfaceType *
232 Interface = Result->getAs<ObjCInterfaceType>()) {
233 // It would be nice if protocol qualifiers were only stored with the
234 // ObjCObjectPointerType. Unfortunately, this isn't possible due
235 // to the following typedef idiom (which is uncommon, but allowed):
238 // static void func() {
242 Result = Context.getObjCInterfaceType(Interface->getDecl(),
243 (ObjCProtocolDecl**)PQ,
244 DS.getNumProtocolQualifiers());
245 } else if (Result->isObjCIdType())
247 Result = Context.getObjCObjectPointerType(Context.ObjCBuiltinIdTy,
248 (ObjCProtocolDecl**)PQ, DS.getNumProtocolQualifiers());
249 else if (Result->isObjCClassType()) {
250 if (DeclLoc.isInvalid())
251 DeclLoc = DS.getSourceRange().getBegin();
252 // Class<protocol-list>
253 Result = Context.getObjCObjectPointerType(Context.ObjCBuiltinClassTy,
254 (ObjCProtocolDecl**)PQ, DS.getNumProtocolQualifiers());
256 if (DeclLoc.isInvalid())
257 DeclLoc = DS.getSourceRange().getBegin();
258 Diag(DeclLoc, diag::err_invalid_protocol_qualifiers)
259 << DS.getSourceRange();
264 // If this is a reference to an invalid typedef, propagate the invalidity.
265 if (TypedefType *TDT = dyn_cast<TypedefType>(Result))
266 if (TDT->getDecl()->isInvalidDecl())
269 // TypeQuals handled by caller.
272 case DeclSpec::TST_typeofType:
273 // FIXME: Preserve type source info.
274 Result = GetTypeFromParser(DS.getTypeRep());
275 assert(!Result.isNull() && "Didn't get a type for typeof?");
276 // TypeQuals handled by caller.
277 Result = Context.getTypeOfType(Result);
279 case DeclSpec::TST_typeofExpr: {
280 Expr *E = static_cast<Expr *>(DS.getTypeRep());
281 assert(E && "Didn't get an expression for typeof?");
282 // TypeQuals handled by caller.
283 Result = Context.getTypeOfExprType(E);
286 case DeclSpec::TST_decltype: {
287 Expr *E = static_cast<Expr *>(DS.getTypeRep());
288 assert(E && "Didn't get an expression for decltype?");
289 // TypeQuals handled by caller.
290 Result = BuildDecltypeType(E);
291 if (Result.isNull()) {
292 Result = Context.IntTy;
297 case DeclSpec::TST_auto: {
298 // TypeQuals handled by caller.
299 Result = Context.UndeducedAutoTy;
303 case DeclSpec::TST_error:
304 Result = Context.IntTy;
309 // Handle complex types.
310 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) {
311 if (getLangOptions().Freestanding)
312 Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex);
313 Result = Context.getComplexType(Result);
316 assert(DS.getTypeSpecComplex() != DeclSpec::TSC_imaginary &&
317 "FIXME: imaginary types not supported yet!");
319 // See if there are any attributes on the declspec that apply to the type (as
320 // opposed to the decl).
321 if (const AttributeList *AL = DS.getAttributes())
322 ProcessTypeAttributeList(Result, AL);
324 // Apply const/volatile/restrict qualifiers to T.
325 if (unsigned TypeQuals = DS.getTypeQualifiers()) {
327 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object
328 // or incomplete types shall not be restrict-qualified." C++ also allows
329 // restrict-qualified references.
330 if (TypeQuals & DeclSpec::TQ_restrict) {
331 if (Result->isPointerType() || Result->isReferenceType()) {
332 QualType EltTy = Result->isPointerType() ?
333 Result->getAs<PointerType>()->getPointeeType() :
334 Result->getAs<ReferenceType>()->getPointeeType();
336 // If we have a pointer or reference, the pointee must have an object
338 if (!EltTy->isIncompleteOrObjectType()) {
339 Diag(DS.getRestrictSpecLoc(),
340 diag::err_typecheck_invalid_restrict_invalid_pointee)
341 << EltTy << DS.getSourceRange();
342 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier.
345 Diag(DS.getRestrictSpecLoc(),
346 diag::err_typecheck_invalid_restrict_not_pointer)
347 << Result << DS.getSourceRange();
348 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier.
352 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification
353 // of a function type includes any type qualifiers, the behavior is
355 if (Result->isFunctionType() && TypeQuals) {
356 // Get some location to point at, either the C or V location.
358 if (TypeQuals & DeclSpec::TQ_const)
359 Loc = DS.getConstSpecLoc();
360 else if (TypeQuals & DeclSpec::TQ_volatile)
361 Loc = DS.getVolatileSpecLoc();
363 assert((TypeQuals & DeclSpec::TQ_restrict) &&
364 "Has CVR quals but not C, V, or R?");
365 Loc = DS.getRestrictSpecLoc();
367 Diag(Loc, diag::warn_typecheck_function_qualifiers)
368 << Result << DS.getSourceRange();
372 // Cv-qualified references are ill-formed except when the
373 // cv-qualifiers are introduced through the use of a typedef
374 // (7.1.3) or of a template type argument (14.3), in which
375 // case the cv-qualifiers are ignored.
376 // FIXME: Shouldn't we be checking SCS_typedef here?
377 if (DS.getTypeSpecType() == DeclSpec::TST_typename &&
378 TypeQuals && Result->isReferenceType()) {
379 TypeQuals &= ~DeclSpec::TQ_const;
380 TypeQuals &= ~DeclSpec::TQ_volatile;
383 Qualifiers Quals = Qualifiers::fromCVRMask(TypeQuals);
384 Result = Context.getQualifiedType(Result, Quals);
387 if (SourceTy.isNull())
392 static std::string getPrintableNameForEntity(DeclarationName Entity) {
394 return Entity.getAsString();
399 /// \brief Build a pointer type.
401 /// \param T The type to which we'll be building a pointer.
403 /// \param Quals The cvr-qualifiers to be applied to the pointer type.
405 /// \param Loc The location of the entity whose type involves this
406 /// pointer type or, if there is no such entity, the location of the
407 /// type that will have pointer type.
409 /// \param Entity The name of the entity that involves the pointer
412 /// \returns A suitable pointer type, if there are no
413 /// errors. Otherwise, returns a NULL type.
414 QualType Sema::BuildPointerType(QualType T, unsigned Quals,
415 SourceLocation Loc, DeclarationName Entity) {
416 if (T->isReferenceType()) {
417 // C++ 8.3.2p4: There shall be no ... pointers to references ...
418 Diag(Loc, diag::err_illegal_decl_pointer_to_reference)
419 << getPrintableNameForEntity(Entity);
423 Qualifiers Qs = Qualifiers::fromCVRMask(Quals);
425 // Enforce C99 6.7.3p2: "Types other than pointer types derived from
426 // object or incomplete types shall not be restrict-qualified."
427 if (Qs.hasRestrict() && !T->isIncompleteOrObjectType()) {
428 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee)
433 // Build the pointer type.
434 return Context.getQualifiedType(Context.getPointerType(T), Qs);
437 /// \brief Build a reference type.
439 /// \param T The type to which we'll be building a reference.
441 /// \param CVR The cvr-qualifiers to be applied to the reference type.
443 /// \param Loc The location of the entity whose type involves this
444 /// reference type or, if there is no such entity, the location of the
445 /// type that will have reference type.
447 /// \param Entity The name of the entity that involves the reference
450 /// \returns A suitable reference type, if there are no
451 /// errors. Otherwise, returns a NULL type.
452 QualType Sema::BuildReferenceType(QualType T, bool LValueRef, unsigned CVR,
453 SourceLocation Loc, DeclarationName Entity) {
454 Qualifiers Quals = Qualifiers::fromCVRMask(CVR);
456 if (const RValueReferenceType *R = T->getAs<RValueReferenceType>()) {
457 // C++0x [dcl.typedef]p9: If a typedef TD names a type that is a
458 // reference to a type T, and attempt to create the type "lvalue
459 // reference to cv TD" creates the type "lvalue reference to T".
460 // We use the qualifiers (restrict or none) of the original reference,
461 // not the new ones. This is consistent with GCC.
462 QualType LVRT = Context.getLValueReferenceType(R->getPointeeType());
463 return Context.getQualifiedType(LVRT, T.getQualifiers());
466 if (T->isReferenceType()) {
467 // C++ [dcl.ref]p4: There shall be no references to references.
469 // According to C++ DR 106, references to references are only
470 // diagnosed when they are written directly (e.g., "int & &"),
471 // but not when they happen via a typedef:
473 // typedef int& intref;
474 // typedef intref& intref2;
476 // Parser::ParseDeclaratorInternal diagnoses the case where
477 // references are written directly; here, we handle the
478 // collapsing of references-to-references as described in C++
479 // DR 106 and amended by C++ DR 540.
484 // A declarator that specifies the type "reference to cv void"
486 if (T->isVoidType()) {
487 Diag(Loc, diag::err_reference_to_void);
491 // Enforce C99 6.7.3p2: "Types other than pointer types derived from
492 // object or incomplete types shall not be restrict-qualified."
493 if (Quals.hasRestrict() && !T->isIncompleteOrObjectType()) {
494 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee)
496 Quals.removeRestrict();
500 // [...] Cv-qualified references are ill-formed except when the
501 // cv-qualifiers are introduced through the use of a typedef
502 // (7.1.3) or of a template type argument (14.3), in which case
503 // the cv-qualifiers are ignored.
505 // We diagnose extraneous cv-qualifiers for the non-typedef,
506 // non-template type argument case within the parser. Here, we just
507 // ignore any extraneous cv-qualifiers.
509 Quals.removeVolatile();
511 // Handle restrict on references.
513 return Context.getQualifiedType(Context.getLValueReferenceType(T), Quals);
514 return Context.getQualifiedType(Context.getRValueReferenceType(T), Quals);
517 /// \brief Build an array type.
519 /// \param T The type of each element in the array.
521 /// \param ASM C99 array size modifier (e.g., '*', 'static').
523 /// \param ArraySize Expression describing the size of the array.
525 /// \param Quals The cvr-qualifiers to be applied to the array's
528 /// \param Loc The location of the entity whose type involves this
529 /// array type or, if there is no such entity, the location of the
530 /// type that will have array type.
532 /// \param Entity The name of the entity that involves the array
535 /// \returns A suitable array type, if there are no errors. Otherwise,
536 /// returns a NULL type.
537 QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM,
538 Expr *ArraySize, unsigned Quals,
539 SourceRange Brackets, DeclarationName Entity) {
541 SourceLocation Loc = Brackets.getBegin();
542 // C99 6.7.5.2p1: If the element type is an incomplete or function type,
543 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]())
544 if (RequireCompleteType(Loc, T,
545 diag::err_illegal_decl_array_incomplete_type))
548 if (T->isFunctionType()) {
549 Diag(Loc, diag::err_illegal_decl_array_of_functions)
550 << getPrintableNameForEntity(Entity);
554 // C++ 8.3.2p4: There shall be no ... arrays of references ...
555 if (T->isReferenceType()) {
556 Diag(Loc, diag::err_illegal_decl_array_of_references)
557 << getPrintableNameForEntity(Entity);
561 if (Context.getCanonicalType(T) == Context.UndeducedAutoTy) {
562 Diag(Loc, diag::err_illegal_decl_array_of_auto)
563 << getPrintableNameForEntity(Entity);
567 if (const RecordType *EltTy = T->getAs<RecordType>()) {
568 // If the element type is a struct or union that contains a variadic
569 // array, accept it as a GNU extension: C99 6.7.2.1p2.
570 if (EltTy->getDecl()->hasFlexibleArrayMember())
571 Diag(Loc, diag::ext_flexible_array_in_array) << T;
572 } else if (T->isObjCInterfaceType()) {
573 Diag(Loc, diag::err_objc_array_of_interfaces) << T;
577 // C99 6.7.5.2p1: The size expression shall have integer type.
578 if (ArraySize && !ArraySize->isTypeDependent() &&
579 !ArraySize->getType()->isIntegerType()) {
580 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int)
581 << ArraySize->getType() << ArraySize->getSourceRange();
582 ArraySize->Destroy(Context);
585 llvm::APSInt ConstVal(32);
587 if (ASM == ArrayType::Star)
588 T = Context.getVariableArrayType(T, 0, ASM, Quals, Brackets);
590 T = Context.getIncompleteArrayType(T, ASM, Quals);
591 } else if (ArraySize->isValueDependent()) {
592 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets);
593 } else if (!ArraySize->isIntegerConstantExpr(ConstVal, Context) ||
594 (!T->isDependentType() && !T->isConstantSizeType())) {
595 // Per C99, a variable array is an array with either a non-constant
596 // size or an element type that has a non-constant-size
597 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets);
599 // C99 6.7.5.2p1: If the expression is a constant expression, it shall
600 // have a value greater than zero.
601 if (ConstVal.isSigned()) {
602 if (ConstVal.isNegative()) {
603 Diag(ArraySize->getLocStart(),
604 diag::err_typecheck_negative_array_size)
605 << ArraySize->getSourceRange();
607 } else if (ConstVal == 0) {
608 // GCC accepts zero sized static arrays.
609 Diag(ArraySize->getLocStart(), diag::ext_typecheck_zero_array_size)
610 << ArraySize->getSourceRange();
613 T = Context.getConstantArrayWithExprType(T, ConstVal, ArraySize,
614 ASM, Quals, Brackets);
616 // If this is not C99, extwarn about VLA's and C99 array size modifiers.
617 if (!getLangOptions().C99) {
618 if (ArraySize && !ArraySize->isTypeDependent() &&
619 !ArraySize->isValueDependent() &&
620 !ArraySize->isIntegerConstantExpr(Context))
621 Diag(Loc, getLangOptions().CPlusPlus? diag::err_vla_cxx : diag::ext_vla);
622 else if (ASM != ArrayType::Normal || Quals != 0)
624 getLangOptions().CPlusPlus? diag::err_c99_array_usage_cxx
625 : diag::ext_c99_array_usage);
631 /// \brief Build an ext-vector type.
633 /// Run the required checks for the extended vector type.
634 QualType Sema::BuildExtVectorType(QualType T, ExprArg ArraySize,
635 SourceLocation AttrLoc) {
637 Expr *Arg = (Expr *)ArraySize.get();
639 // unlike gcc's vector_size attribute, we do not allow vectors to be defined
640 // in conjunction with complex types (pointers, arrays, functions, etc.).
641 if (!T->isDependentType() &&
642 !T->isIntegerType() && !T->isRealFloatingType()) {
643 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T;
647 if (!Arg->isTypeDependent() && !Arg->isValueDependent()) {
648 llvm::APSInt vecSize(32);
649 if (!Arg->isIntegerConstantExpr(vecSize, Context)) {
650 Diag(AttrLoc, diag::err_attribute_argument_not_int)
651 << "ext_vector_type" << Arg->getSourceRange();
655 // unlike gcc's vector_size attribute, the size is specified as the
656 // number of elements, not the number of bytes.
657 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue());
659 if (vectorSize == 0) {
660 Diag(AttrLoc, diag::err_attribute_zero_size)
661 << Arg->getSourceRange();
665 if (!T->isDependentType())
666 return Context.getExtVectorType(T, vectorSize);
669 return Context.getDependentSizedExtVectorType(T, ArraySize.takeAs<Expr>(),
673 /// \brief Build a function type.
675 /// This routine checks the function type according to C++ rules and
676 /// under the assumption that the result type and parameter types have
677 /// just been instantiated from a template. It therefore duplicates
678 /// some of the behavior of GetTypeForDeclarator, but in a much
679 /// simpler form that is only suitable for this narrow use case.
681 /// \param T The return type of the function.
683 /// \param ParamTypes The parameter types of the function. This array
684 /// will be modified to account for adjustments to the types of the
685 /// function parameters.
687 /// \param NumParamTypes The number of parameter types in ParamTypes.
689 /// \param Variadic Whether this is a variadic function type.
691 /// \param Quals The cvr-qualifiers to be applied to the function type.
693 /// \param Loc The location of the entity whose type involves this
694 /// function type or, if there is no such entity, the location of the
695 /// type that will have function type.
697 /// \param Entity The name of the entity that involves the function
700 /// \returns A suitable function type, if there are no
701 /// errors. Otherwise, returns a NULL type.
702 QualType Sema::BuildFunctionType(QualType T,
703 QualType *ParamTypes,
704 unsigned NumParamTypes,
705 bool Variadic, unsigned Quals,
706 SourceLocation Loc, DeclarationName Entity) {
707 if (T->isArrayType() || T->isFunctionType()) {
708 Diag(Loc, diag::err_func_returning_array_function) << T;
712 bool Invalid = false;
713 for (unsigned Idx = 0; Idx < NumParamTypes; ++Idx) {
714 QualType ParamType = adjustParameterType(ParamTypes[Idx]);
715 if (ParamType->isVoidType()) {
716 Diag(Loc, diag::err_param_with_void_type);
720 ParamTypes[Idx] = adjustFunctionParamType(ParamType);
726 return Context.getFunctionType(T, ParamTypes, NumParamTypes, Variadic,
730 /// \brief Build a member pointer type \c T Class::*.
732 /// \param T the type to which the member pointer refers.
733 /// \param Class the class type into which the member pointer points.
734 /// \param CVR Qualifiers applied to the member pointer type
735 /// \param Loc the location where this type begins
736 /// \param Entity the name of the entity that will have this member pointer type
738 /// \returns a member pointer type, if successful, or a NULL type if there was
740 QualType Sema::BuildMemberPointerType(QualType T, QualType Class,
741 unsigned CVR, SourceLocation Loc,
742 DeclarationName Entity) {
743 Qualifiers Quals = Qualifiers::fromCVRMask(CVR);
745 // Verify that we're not building a pointer to pointer to function with
746 // exception specification.
747 if (CheckDistantExceptionSpec(T)) {
748 Diag(Loc, diag::err_distant_exception_spec);
750 // FIXME: If we're doing this as part of template instantiation,
751 // we should return immediately.
753 // Build the type anyway, but use the canonical type so that the
754 // exception specifiers are stripped off.
755 T = Context.getCanonicalType(T);
758 // C++ 8.3.3p3: A pointer to member shall not pointer to ... a member
759 // with reference type, or "cv void."
760 if (T->isReferenceType()) {
761 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference)
762 << (Entity? Entity.getAsString() : "type name");
766 if (T->isVoidType()) {
767 Diag(Loc, diag::err_illegal_decl_mempointer_to_void)
768 << (Entity? Entity.getAsString() : "type name");
772 // Enforce C99 6.7.3p2: "Types other than pointer types derived from
773 // object or incomplete types shall not be restrict-qualified."
774 if (Quals.hasRestrict() && !T->isIncompleteOrObjectType()) {
775 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee)
778 // FIXME: If we're doing this as part of template instantiation,
779 // we should return immediately.
780 Quals.removeRestrict();
783 if (!Class->isDependentType() && !Class->isRecordType()) {
784 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class;
788 return Context.getQualifiedType(
789 Context.getMemberPointerType(T, Class.getTypePtr()), Quals);
792 /// \brief Build a block pointer type.
794 /// \param T The type to which we'll be building a block pointer.
796 /// \param CVR The cvr-qualifiers to be applied to the block pointer type.
798 /// \param Loc The location of the entity whose type involves this
799 /// block pointer type or, if there is no such entity, the location of the
800 /// type that will have block pointer type.
802 /// \param Entity The name of the entity that involves the block pointer
805 /// \returns A suitable block pointer type, if there are no
806 /// errors. Otherwise, returns a NULL type.
807 QualType Sema::BuildBlockPointerType(QualType T, unsigned CVR,
809 DeclarationName Entity) {
810 if (!T->isFunctionType()) {
811 Diag(Loc, diag::err_nonfunction_block_type);
815 Qualifiers Quals = Qualifiers::fromCVRMask(CVR);
816 return Context.getQualifiedType(Context.getBlockPointerType(T), Quals);
819 QualType Sema::GetTypeFromParser(TypeTy *Ty, DeclaratorInfo **DInfo) {
820 QualType QT = QualType::getFromOpaquePtr(Ty);
821 DeclaratorInfo *DI = 0;
822 if (LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) {
824 DI = LIT->getDeclaratorInfo();
827 if (DInfo) *DInfo = DI;
831 /// GetTypeForDeclarator - Convert the type for the specified
832 /// declarator to Type instances. Skip the outermost Skip type
835 /// If OwnedDecl is non-NULL, and this declarator's decl-specifier-seq
836 /// owns the declaration of a type (e.g., the definition of a struct
837 /// type), then *OwnedDecl will receive the owned declaration.
838 QualType Sema::GetTypeForDeclarator(Declarator &D, Scope *S,
839 DeclaratorInfo **DInfo, unsigned Skip,
840 TagDecl **OwnedDecl) {
841 bool OmittedReturnType = false;
843 if (D.getContext() == Declarator::BlockLiteralContext
845 && !D.getDeclSpec().hasTypeSpecifier()
846 && (D.getNumTypeObjects() == 0
847 || (D.getNumTypeObjects() == 1
848 && D.getTypeObject(0).Kind == DeclaratorChunk::Function)))
849 OmittedReturnType = true;
851 // long long is a C99 feature.
852 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x &&
853 D.getDeclSpec().getTypeSpecWidth() == DeclSpec::TSW_longlong)
854 Diag(D.getDeclSpec().getTypeSpecWidthLoc(), diag::ext_longlong);
856 // Determine the type of the declarator. Not all forms of declarator
859 // The QualType referring to the type as written in source code. We can't use
860 // T because it can change due to semantic analysis.
863 switch (D.getKind()) {
864 case Declarator::DK_Abstract:
865 case Declarator::DK_Normal:
866 case Declarator::DK_Operator:
867 case Declarator::DK_TemplateId: {
868 const DeclSpec &DS = D.getDeclSpec();
869 if (OmittedReturnType) {
870 // We default to a dependent type initially. Can be modified by
871 // the first return statement.
872 T = Context.DependentTy;
874 bool isInvalid = false;
875 T = ConvertDeclSpecToType(DS, D.getIdentifierLoc(), isInvalid, SourceTy);
877 D.setInvalidType(true);
878 else if (OwnedDecl && DS.isTypeSpecOwned())
879 *OwnedDecl = cast<TagDecl>((Decl *)DS.getTypeRep());
884 case Declarator::DK_Constructor:
885 case Declarator::DK_Destructor:
886 case Declarator::DK_Conversion:
887 // Constructors and destructors don't have return types. Use
888 // "void" instead. Conversion operators will check their return
894 if (SourceTy.isNull())
897 if (T == Context.UndeducedAutoTy) {
900 switch (D.getContext()) {
901 case Declarator::KNRTypeListContext:
902 assert(0 && "K&R type lists aren't allowed in C++");
904 case Declarator::PrototypeContext:
905 Error = 0; // Function prototype
907 case Declarator::MemberContext:
908 switch (cast<TagDecl>(CurContext)->getTagKind()) {
909 case TagDecl::TK_enum: assert(0 && "unhandled tag kind"); break;
910 case TagDecl::TK_struct: Error = 1; /* Struct member */ break;
911 case TagDecl::TK_union: Error = 2; /* Union member */ break;
912 case TagDecl::TK_class: Error = 3; /* Class member */ break;
915 case Declarator::CXXCatchContext:
916 Error = 4; // Exception declaration
918 case Declarator::TemplateParamContext:
919 Error = 5; // Template parameter
921 case Declarator::BlockLiteralContext:
922 Error = 6; // Block literal
924 case Declarator::FileContext:
925 case Declarator::BlockContext:
926 case Declarator::ForContext:
927 case Declarator::ConditionContext:
928 case Declarator::TypeNameContext:
933 Diag(D.getDeclSpec().getTypeSpecTypeLoc(), diag::err_auto_not_allowed)
936 D.setInvalidType(true);
940 // The name we're declaring, if any.
941 DeclarationName Name;
942 if (D.getIdentifier())
943 Name = D.getIdentifier();
945 bool ShouldBuildInfo = DInfo != 0;
947 // Walk the DeclTypeInfo, building the recursive type as we go.
948 // DeclTypeInfos are ordered from the identifier out, which is
949 // opposite of what we want :).
950 for (unsigned i = Skip, e = D.getNumTypeObjects(); i != e; ++i) {
951 DeclaratorChunk &DeclType = D.getTypeObject(e-i-1+Skip);
952 switch (DeclType.Kind) {
953 default: assert(0 && "Unknown decltype!");
954 case DeclaratorChunk::BlockPointer:
955 if (ShouldBuildInfo) {
956 if (SourceTy->isFunctionType())
958 = Context.getQualifiedType(Context.getBlockPointerType(SourceTy),
959 Qualifiers::fromCVRMask(DeclType.Cls.TypeQuals));
961 // If not function type Context::getBlockPointerType asserts,
963 ShouldBuildInfo = false;
966 // If blocks are disabled, emit an error.
967 if (!LangOpts.Blocks)
968 Diag(DeclType.Loc, diag::err_blocks_disable);
970 T = BuildBlockPointerType(T, DeclType.Cls.TypeQuals, D.getIdentifierLoc(),
973 case DeclaratorChunk::Pointer:
974 //FIXME: Use ObjCObjectPointer for info when appropriate.
976 SourceTy = Context.getQualifiedType(Context.getPointerType(SourceTy),
977 Qualifiers::fromCVRMask(DeclType.Ptr.TypeQuals));
978 // Verify that we're not building a pointer to pointer to function with
979 // exception specification.
980 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) {
981 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec);
982 D.setInvalidType(true);
983 // Build the type anyway.
985 if (getLangOptions().ObjC1 && T->isObjCInterfaceType()) {
986 const ObjCInterfaceType *OIT = T->getAs<ObjCInterfaceType>();
987 T = Context.getObjCObjectPointerType(T,
988 (ObjCProtocolDecl **)OIT->qual_begin(),
989 OIT->getNumProtocols());
992 T = BuildPointerType(T, DeclType.Ptr.TypeQuals, DeclType.Loc, Name);
994 case DeclaratorChunk::Reference: {
996 if (DeclType.Ref.HasRestrict) Quals.addRestrict();
998 if (ShouldBuildInfo) {
999 if (DeclType.Ref.LValueRef)
1000 SourceTy = Context.getLValueReferenceType(SourceTy);
1002 SourceTy = Context.getRValueReferenceType(SourceTy);
1003 SourceTy = Context.getQualifiedType(SourceTy, Quals);
1006 // Verify that we're not building a reference to pointer to function with
1007 // exception specification.
1008 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) {
1009 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec);
1010 D.setInvalidType(true);
1011 // Build the type anyway.
1013 T = BuildReferenceType(T, DeclType.Ref.LValueRef, Quals,
1014 DeclType.Loc, Name);
1017 case DeclaratorChunk::Array: {
1018 if (ShouldBuildInfo)
1019 // We just need to get an array type, the exact type doesn't matter.
1020 SourceTy = Context.getIncompleteArrayType(SourceTy, ArrayType::Normal,
1021 DeclType.Arr.TypeQuals);
1023 // Verify that we're not building an array of pointers to function with
1024 // exception specification.
1025 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) {
1026 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec);
1027 D.setInvalidType(true);
1028 // Build the type anyway.
1030 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr;
1031 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts);
1032 ArrayType::ArraySizeModifier ASM;
1034 ASM = ArrayType::Star;
1035 else if (ATI.hasStatic)
1036 ASM = ArrayType::Static;
1038 ASM = ArrayType::Normal;
1039 if (ASM == ArrayType::Star &&
1040 D.getContext() != Declarator::PrototypeContext) {
1041 // FIXME: This check isn't quite right: it allows star in prototypes
1042 // for function definitions, and disallows some edge cases detailed
1043 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html
1044 Diag(DeclType.Loc, diag::err_array_star_outside_prototype);
1045 ASM = ArrayType::Normal;
1046 D.setInvalidType(true);
1048 T = BuildArrayType(T, ASM, ArraySize,
1049 Qualifiers::fromCVRMask(ATI.TypeQuals),
1050 SourceRange(DeclType.Loc, DeclType.EndLoc), Name);
1053 case DeclaratorChunk::Function: {
1054 if (ShouldBuildInfo) {
1055 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun;
1056 llvm::SmallVector<QualType, 16> ArgTys;
1058 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) {
1059 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>();
1061 QualType ArgTy = adjustFunctionParamType(Param->getType());
1063 ArgTys.push_back(ArgTy);
1066 SourceTy = Context.getFunctionType(SourceTy, ArgTys.data(),
1072 // If the function declarator has a prototype (i.e. it is not () and
1073 // does not have a K&R-style identifier list), then the arguments are part
1074 // of the type, otherwise the argument list is ().
1075 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun;
1077 // C99 6.7.5.3p1: The return type may not be a function or array type.
1078 if (T->isArrayType() || T->isFunctionType()) {
1079 Diag(DeclType.Loc, diag::err_func_returning_array_function) << T;
1081 D.setInvalidType(true);
1084 if (getLangOptions().CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) {
1086 // Types shall not be defined in return or parameter types.
1087 TagDecl *Tag = cast<TagDecl>((Decl *)D.getDeclSpec().getTypeRep());
1088 if (Tag->isDefinition())
1089 Diag(Tag->getLocation(), diag::err_type_defined_in_result_type)
1090 << Context.getTypeDeclType(Tag);
1093 // Exception specs are not allowed in typedefs. Complain, but add it
1095 if (FTI.hasExceptionSpec &&
1096 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef)
1097 Diag(FTI.getThrowLoc(), diag::err_exception_spec_in_typedef);
1099 if (FTI.NumArgs == 0) {
1100 if (getLangOptions().CPlusPlus) {
1101 // C++ 8.3.5p2: If the parameter-declaration-clause is empty, the
1102 // function takes no arguments.
1103 llvm::SmallVector<QualType, 4> Exceptions;
1104 Exceptions.reserve(FTI.NumExceptions);
1105 for (unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) {
1106 // FIXME: Preserve type source info.
1107 QualType ET = GetTypeFromParser(FTI.Exceptions[ei].Ty);
1108 // Check that the type is valid for an exception spec, and drop it
1110 if (!CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range))
1111 Exceptions.push_back(ET);
1113 T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic, FTI.TypeQuals,
1114 FTI.hasExceptionSpec,
1115 FTI.hasAnyExceptionSpec,
1116 Exceptions.size(), Exceptions.data());
1117 } else if (FTI.isVariadic) {
1118 // We allow a zero-parameter variadic function in C if the
1119 // function is marked with the "overloadable"
1120 // attribute. Scan for this attribute now.
1121 bool Overloadable = false;
1122 for (const AttributeList *Attrs = D.getAttributes();
1123 Attrs; Attrs = Attrs->getNext()) {
1124 if (Attrs->getKind() == AttributeList::AT_overloadable) {
1125 Overloadable = true;
1131 Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg);
1132 T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic, 0);
1134 // Simple void foo(), where the incoming T is the result type.
1135 T = Context.getFunctionNoProtoType(T);
1137 } else if (FTI.ArgInfo[0].Param == 0) {
1138 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function definition.
1139 Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration);
1141 // Otherwise, we have a function with an argument list that is
1142 // potentially variadic.
1143 llvm::SmallVector<QualType, 16> ArgTys;
1145 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) {
1146 ParmVarDecl *Param =
1147 cast<ParmVarDecl>(FTI.ArgInfo[i].Param.getAs<Decl>());
1148 QualType ArgTy = Param->getType();
1149 assert(!ArgTy.isNull() && "Couldn't parse type?");
1151 // Adjust the parameter type.
1152 assert((ArgTy == adjustParameterType(ArgTy)) && "Unadjusted type?");
1154 // Look for 'void'. void is allowed only as a single argument to a
1155 // function with no other parameters (C99 6.7.5.3p10). We record
1156 // int(void) as a FunctionProtoType with an empty argument list.
1157 if (ArgTy->isVoidType()) {
1158 // If this is something like 'float(int, void)', reject it. 'void'
1159 // is an incomplete type (C99 6.2.5p19) and function decls cannot
1160 // have arguments of incomplete type.
1161 if (FTI.NumArgs != 1 || FTI.isVariadic) {
1162 Diag(DeclType.Loc, diag::err_void_only_param);
1163 ArgTy = Context.IntTy;
1164 Param->setType(ArgTy);
1165 } else if (FTI.ArgInfo[i].Ident) {
1166 // Reject, but continue to parse 'int(void abc)'.
1167 Diag(FTI.ArgInfo[i].IdentLoc,
1168 diag::err_param_with_void_type);
1169 ArgTy = Context.IntTy;
1170 Param->setType(ArgTy);
1172 // Reject, but continue to parse 'float(const void)'.
1173 if (ArgTy.hasQualifiers())
1174 Diag(DeclType.Loc, diag::err_void_param_qualified);
1176 // Do not add 'void' to the ArgTys list.
1179 } else if (!FTI.hasPrototype) {
1180 if (ArgTy->isPromotableIntegerType()) {
1181 ArgTy = Context.getPromotedIntegerType(ArgTy);
1182 } else if (const BuiltinType* BTy = ArgTy->getAs<BuiltinType>()) {
1183 if (BTy->getKind() == BuiltinType::Float)
1184 ArgTy = Context.DoubleTy;
1188 ArgTys.push_back(adjustFunctionParamType(ArgTy));
1191 llvm::SmallVector<QualType, 4> Exceptions;
1192 Exceptions.reserve(FTI.NumExceptions);
1193 for (unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) {
1194 // FIXME: Preserve type source info.
1195 QualType ET = GetTypeFromParser(FTI.Exceptions[ei].Ty);
1196 // Check that the type is valid for an exception spec, and drop it if
1198 if (!CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range))
1199 Exceptions.push_back(ET);
1202 T = Context.getFunctionType(T, ArgTys.data(), ArgTys.size(),
1203 FTI.isVariadic, FTI.TypeQuals,
1204 FTI.hasExceptionSpec,
1205 FTI.hasAnyExceptionSpec,
1206 Exceptions.size(), Exceptions.data());
1210 case DeclaratorChunk::MemberPointer:
1211 // Verify that we're not building a pointer to pointer to function with
1212 // exception specification.
1213 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) {
1214 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec);
1215 D.setInvalidType(true);
1216 // Build the type anyway.
1218 // The scope spec must refer to a class, or be dependent.
1220 if (isDependentScopeSpecifier(DeclType.Mem.Scope())) {
1221 NestedNameSpecifier *NNS
1222 = (NestedNameSpecifier *)DeclType.Mem.Scope().getScopeRep();
1223 assert(NNS->getAsType() && "Nested-name-specifier must name a type");
1224 ClsType = QualType(NNS->getAsType(), 0);
1225 } else if (CXXRecordDecl *RD
1226 = dyn_cast_or_null<CXXRecordDecl>(
1227 computeDeclContext(DeclType.Mem.Scope()))) {
1228 ClsType = Context.getTagDeclType(RD);
1230 Diag(DeclType.Mem.Scope().getBeginLoc(),
1231 diag::err_illegal_decl_mempointer_in_nonclass)
1232 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name")
1233 << DeclType.Mem.Scope().getRange();
1234 D.setInvalidType(true);
1237 if (ShouldBuildInfo) {
1238 QualType cls = !ClsType.isNull() ? ClsType : Context.IntTy;
1239 SourceTy = Context.getQualifiedType(
1240 Context.getMemberPointerType(SourceTy, cls.getTypePtr()),
1241 Qualifiers::fromCVRMask(DeclType.Mem.TypeQuals));
1244 if (!ClsType.isNull())
1245 T = BuildMemberPointerType(T, ClsType, DeclType.Mem.TypeQuals,
1246 DeclType.Loc, D.getIdentifier());
1249 D.setInvalidType(true);
1255 D.setInvalidType(true);
1259 // See if there are any attributes on this declarator chunk.
1260 if (const AttributeList *AL = DeclType.getAttrs())
1261 ProcessTypeAttributeList(T, AL);
1264 if (getLangOptions().CPlusPlus && T->isFunctionType()) {
1265 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>();
1266 assert(FnTy && "Why oh why is there not a FunctionProtoType here ?");
1268 // C++ 8.3.5p4: A cv-qualifier-seq shall only be part of the function type
1269 // for a nonstatic member function, the function type to which a pointer
1270 // to member refers, or the top-level function type of a function typedef
1272 if (FnTy->getTypeQuals() != 0 &&
1273 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef &&
1274 ((D.getContext() != Declarator::MemberContext &&
1275 (!D.getCXXScopeSpec().isSet() ||
1276 !computeDeclContext(D.getCXXScopeSpec(), /*FIXME:*/true)
1278 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static)) {
1279 if (D.isFunctionDeclarator())
1280 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_function_type);
1282 Diag(D.getIdentifierLoc(),
1283 diag::err_invalid_qualified_typedef_function_type_use);
1285 // Strip the cv-quals from the type.
1286 T = Context.getFunctionType(FnTy->getResultType(), FnTy->arg_type_begin(),
1287 FnTy->getNumArgs(), FnTy->isVariadic(), 0);
1291 // If there were any type attributes applied to the decl itself (not the
1292 // type, apply the type attribute to the type!)
1293 if (const AttributeList *Attrs = D.getAttributes())
1294 ProcessTypeAttributeList(T, Attrs);
1296 if (ShouldBuildInfo)
1297 *DInfo = GetDeclaratorInfoForDeclarator(D, SourceTy, Skip);
1302 static void FillTypeSpecLoc(TypeLoc TSL, const DeclSpec &DS) {
1303 if (TSL.isNull()) return;
1305 if (TypedefLoc *TL = dyn_cast<TypedefLoc>(&TSL)) {
1306 TL->setNameLoc(DS.getTypeSpecTypeLoc());
1308 } else if (ObjCInterfaceLoc *TL = dyn_cast<ObjCInterfaceLoc>(&TSL)) {
1309 TL->setNameLoc(DS.getTypeSpecTypeLoc());
1311 } else if (ObjCProtocolListLoc *PLL = dyn_cast<ObjCProtocolListLoc>(&TSL)) {
1312 assert(PLL->getNumProtocols() == DS.getNumProtocolQualifiers());
1313 PLL->setLAngleLoc(DS.getProtocolLAngleLoc());
1314 PLL->setRAngleLoc(DS.getSourceRange().getEnd());
1315 for (unsigned i = 0; i != DS.getNumProtocolQualifiers(); ++i)
1316 PLL->setProtocolLoc(i, DS.getProtocolLocs()[i]);
1317 FillTypeSpecLoc(PLL->getBaseTypeLoc(), DS);
1320 //FIXME: Other typespecs.
1321 DefaultTypeSpecLoc &DTL = cast<DefaultTypeSpecLoc>(TSL);
1322 DTL.setStartLoc(DS.getSourceRange().getBegin());
1326 /// \brief Create and instantiate a DeclaratorInfo with type source information.
1328 /// \param T QualType referring to the type as written in source code.
1330 Sema::GetDeclaratorInfoForDeclarator(Declarator &D, QualType T, unsigned Skip) {
1331 DeclaratorInfo *DInfo = Context.CreateDeclaratorInfo(T);
1332 TypeLoc CurrTL = DInfo->getTypeLoc();
1334 for (unsigned i = Skip, e = D.getNumTypeObjects(); i != e; ++i) {
1335 assert(!CurrTL.isNull());
1337 // Don't bother recording source locations for qualifiers.
1338 CurrTL = CurrTL.getUnqualifiedLoc();
1340 DeclaratorChunk &DeclType = D.getTypeObject(i);
1341 switch (DeclType.Kind) {
1342 default: assert(0 && "Unknown decltype!");
1343 case DeclaratorChunk::BlockPointer: {
1344 BlockPointerLoc &BPL = cast<BlockPointerLoc>(CurrTL);
1345 BPL.setCaretLoc(DeclType.Loc);
1348 case DeclaratorChunk::Pointer: {
1349 //FIXME: ObjCObject pointers.
1350 PointerLoc &PL = cast<PointerLoc>(CurrTL);
1351 PL.setStarLoc(DeclType.Loc);
1354 case DeclaratorChunk::Reference: {
1355 ReferenceLoc &RL = cast<ReferenceLoc>(CurrTL);
1356 RL.setAmpLoc(DeclType.Loc);
1359 case DeclaratorChunk::Array: {
1360 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr;
1361 ArrayLoc &AL = cast<ArrayLoc>(CurrTL);
1362 AL.setLBracketLoc(DeclType.Loc);
1363 AL.setRBracketLoc(DeclType.EndLoc);
1364 AL.setSizeExpr(static_cast<Expr*>(ATI.NumElts));
1365 //FIXME: Star location for [*].
1368 case DeclaratorChunk::Function: {
1369 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun;
1370 FunctionLoc &FL = cast<FunctionLoc>(CurrTL);
1371 FL.setLParenLoc(DeclType.Loc);
1372 FL.setRParenLoc(DeclType.EndLoc);
1373 for (unsigned i = 0, e = FTI.NumArgs, tpi = 0; i != e; ++i) {
1374 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>();
1376 assert(tpi < FL.getNumArgs());
1377 FL.setArg(tpi++, Param);
1381 //FIXME: Exception specs.
1383 case DeclaratorChunk::MemberPointer: {
1384 MemberPointerLoc &MPL = cast<MemberPointerLoc>(CurrTL);
1385 MPL.setStarLoc(DeclType.Loc);
1386 //FIXME: Class location.
1392 CurrTL = CurrTL.getNextTypeLoc();
1395 FillTypeSpecLoc(CurrTL, D.getDeclSpec());
1400 /// \brief Create a LocInfoType to hold the given QualType and DeclaratorInfo.
1401 QualType Sema::CreateLocInfoType(QualType T, DeclaratorInfo *DInfo) {
1402 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser
1403 // and Sema during declaration parsing. Try deallocating/caching them when
1404 // it's appropriate, instead of allocating them and keeping them around.
1405 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType), 8);
1406 new (LocT) LocInfoType(T, DInfo);
1407 assert(LocT->getTypeClass() != T->getTypeClass() &&
1408 "LocInfoType's TypeClass conflicts with an existing Type class");
1409 return QualType(LocT, 0);
1412 void LocInfoType::getAsStringInternal(std::string &Str,
1413 const PrintingPolicy &Policy) const {
1414 assert(false && "LocInfoType leaked into the type system; an opaque TypeTy*"
1415 " was used directly instead of getting the QualType through"
1416 " GetTypeFromParser");
1419 /// ObjCGetTypeForMethodDefinition - Builds the type for a method definition
1421 QualType Sema::ObjCGetTypeForMethodDefinition(DeclPtrTy D) {
1422 ObjCMethodDecl *MDecl = cast<ObjCMethodDecl>(D.getAs<Decl>());
1423 QualType T = MDecl->getResultType();
1424 llvm::SmallVector<QualType, 16> ArgTys;
1426 // Add the first two invisible argument types for self and _cmd.
1427 if (MDecl->isInstanceMethod()) {
1428 QualType selfTy = Context.getObjCInterfaceType(MDecl->getClassInterface());
1429 selfTy = Context.getPointerType(selfTy);
1430 ArgTys.push_back(selfTy);
1432 ArgTys.push_back(Context.getObjCIdType());
1433 ArgTys.push_back(Context.getObjCSelType());
1435 for (ObjCMethodDecl::param_iterator PI = MDecl->param_begin(),
1436 E = MDecl->param_end(); PI != E; ++PI) {
1437 QualType ArgTy = (*PI)->getType();
1438 assert(!ArgTy.isNull() && "Couldn't parse type?");
1439 ArgTy = adjustParameterType(ArgTy);
1440 ArgTys.push_back(ArgTy);
1442 T = Context.getFunctionType(T, &ArgTys[0], ArgTys.size(),
1443 MDecl->isVariadic(), 0);
1447 /// UnwrapSimilarPointerTypes - If T1 and T2 are pointer types that
1448 /// may be similar (C++ 4.4), replaces T1 and T2 with the type that
1449 /// they point to and return true. If T1 and T2 aren't pointer types
1450 /// or pointer-to-member types, or if they are not similar at this
1451 /// level, returns false and leaves T1 and T2 unchanged. Top-level
1452 /// qualifiers on T1 and T2 are ignored. This function will typically
1453 /// be called in a loop that successively "unwraps" pointer and
1454 /// pointer-to-member types to compare them at each level.
1455 bool Sema::UnwrapSimilarPointerTypes(QualType& T1, QualType& T2) {
1456 const PointerType *T1PtrType = T1->getAs<PointerType>(),
1457 *T2PtrType = T2->getAs<PointerType>();
1458 if (T1PtrType && T2PtrType) {
1459 T1 = T1PtrType->getPointeeType();
1460 T2 = T2PtrType->getPointeeType();
1464 const MemberPointerType *T1MPType = T1->getAs<MemberPointerType>(),
1465 *T2MPType = T2->getAs<MemberPointerType>();
1466 if (T1MPType && T2MPType &&
1467 Context.getCanonicalType(T1MPType->getClass()) ==
1468 Context.getCanonicalType(T2MPType->getClass())) {
1469 T1 = T1MPType->getPointeeType();
1470 T2 = T2MPType->getPointeeType();
1476 Sema::TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) {
1477 // C99 6.7.6: Type names have no identifier. This is already validated by
1479 assert(D.getIdentifier() == 0 && "Type name should have no identifier!");
1481 DeclaratorInfo *DInfo = 0;
1482 TagDecl *OwnedTag = 0;
1483 QualType T = GetTypeForDeclarator(D, S, &DInfo, /*Skip=*/0, &OwnedTag);
1484 if (D.isInvalidType())
1487 if (getLangOptions().CPlusPlus) {
1488 // Check that there are no default arguments (C++ only).
1489 CheckExtraCXXDefaultArguments(D);
1491 // C++0x [dcl.type]p3:
1492 // A type-specifier-seq shall not define a class or enumeration
1493 // unless it appears in the type-id of an alias-declaration
1495 if (OwnedTag && OwnedTag->isDefinition())
1496 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_type_specifier)
1497 << Context.getTypeDeclType(OwnedTag);
1501 T = CreateLocInfoType(T, DInfo);
1503 return T.getAsOpaquePtr();
1508 //===----------------------------------------------------------------------===//
1509 // Type Attribute Processing
1510 //===----------------------------------------------------------------------===//
1512 /// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the
1513 /// specified type. The attribute contains 1 argument, the id of the address
1514 /// space for the type.
1515 static void HandleAddressSpaceTypeAttribute(QualType &Type,
1516 const AttributeList &Attr, Sema &S){
1518 // If this type is already address space qualified, reject it.
1519 // Clause 6.7.3 - Type qualifiers: "No type shall be qualified by qualifiers
1520 // for two or more different address spaces."
1521 if (Type.getAddressSpace()) {
1522 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers);
1526 // Check the attribute arguments.
1527 if (Attr.getNumArgs() != 1) {
1528 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1;
1531 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0));
1532 llvm::APSInt addrSpace(32);
1533 if (!ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) {
1534 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int)
1535 << ASArgExpr->getSourceRange();
1540 if (addrSpace.isSigned()) {
1541 if (addrSpace.isNegative()) {
1542 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative)
1543 << ASArgExpr->getSourceRange();
1546 addrSpace.setIsSigned(false);
1548 llvm::APSInt max(addrSpace.getBitWidth());
1549 max = Qualifiers::MaxAddressSpace;
1550 if (addrSpace > max) {
1551 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high)
1552 << Qualifiers::MaxAddressSpace << ASArgExpr->getSourceRange();
1556 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue());
1557 Type = S.Context.getAddrSpaceQualType(Type, ASIdx);
1560 /// HandleObjCGCTypeAttribute - Process an objc's gc attribute on the
1561 /// specified type. The attribute contains 1 argument, weak or strong.
1562 static void HandleObjCGCTypeAttribute(QualType &Type,
1563 const AttributeList &Attr, Sema &S) {
1564 if (Type.getObjCGCAttr() != Qualifiers::GCNone) {
1565 S.Diag(Attr.getLoc(), diag::err_attribute_multiple_objc_gc);
1569 // Check the attribute arguments.
1570 if (!Attr.getParameterName()) {
1571 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string)
1575 Qualifiers::GC GCAttr;
1576 if (Attr.getNumArgs() != 0) {
1577 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1;
1580 if (Attr.getParameterName()->isStr("weak"))
1581 GCAttr = Qualifiers::Weak;
1582 else if (Attr.getParameterName()->isStr("strong"))
1583 GCAttr = Qualifiers::Strong;
1585 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported)
1586 << "objc_gc" << Attr.getParameterName();
1590 Type = S.Context.getObjCGCQualType(Type, GCAttr);
1593 /// HandleNoReturnTypeAttribute - Process the noreturn attribute on the
1594 /// specified type. The attribute contains 0 arguments.
1595 static void HandleNoReturnTypeAttribute(QualType &Type,
1596 const AttributeList &Attr, Sema &S) {
1597 if (Attr.getNumArgs() != 0)
1600 // We only apply this to a pointer to function or a pointer to block.
1601 if (!Type->isFunctionPointerType()
1602 && !Type->isBlockPointerType()
1603 && !Type->isFunctionType())
1606 Type = S.Context.getNoReturnType(Type);
1609 void Sema::ProcessTypeAttributeList(QualType &Result, const AttributeList *AL) {
1610 // Scan through and apply attributes to this type where it makes sense. Some
1611 // attributes (such as __address_space__, __vector_size__, etc) apply to the
1612 // type, but others can be present in the type specifiers even though they
1613 // apply to the decl. Here we apply type attributes and ignore the rest.
1614 for (; AL; AL = AL->getNext()) {
1615 // If this is an attribute we can handle, do so now, otherwise, add it to
1616 // the LeftOverAttrs list for rechaining.
1617 switch (AL->getKind()) {
1619 case AttributeList::AT_address_space:
1620 HandleAddressSpaceTypeAttribute(Result, *AL, *this);
1622 case AttributeList::AT_objc_gc:
1623 HandleObjCGCTypeAttribute(Result, *AL, *this);
1625 case AttributeList::AT_noreturn:
1626 HandleNoReturnTypeAttribute(Result, *AL, *this);
1632 /// @brief Ensure that the type T is a complete type.
1634 /// This routine checks whether the type @p T is complete in any
1635 /// context where a complete type is required. If @p T is a complete
1636 /// type, returns false. If @p T is a class template specialization,
1637 /// this routine then attempts to perform class template
1638 /// instantiation. If instantiation fails, or if @p T is incomplete
1639 /// and cannot be completed, issues the diagnostic @p diag (giving it
1640 /// the type @p T) and returns true.
1642 /// @param Loc The location in the source that the incomplete type
1643 /// diagnostic should refer to.
1645 /// @param T The type that this routine is examining for completeness.
1647 /// @param PD The partial diagnostic that will be printed out if T is not a
1650 /// @returns @c true if @p T is incomplete and a diagnostic was emitted,
1651 /// @c false otherwise.
1652 bool Sema::RequireCompleteType(SourceLocation Loc, QualType T,
1653 const PartialDiagnostic &PD,
1654 std::pair<SourceLocation,
1655 PartialDiagnostic> Note) {
1656 unsigned diag = PD.getDiagID();
1658 // FIXME: Add this assertion to help us flush out problems with
1659 // checking for dependent types and type-dependent expressions.
1661 // assert(!T->isDependentType() &&
1662 // "Can't ask whether a dependent type is complete");
1664 // If we have a complete type, we're done.
1665 if (!T->isIncompleteType())
1668 // If we have a class template specialization or a class member of a
1669 // class template specialization, try to instantiate it.
1670 if (const RecordType *Record = T->getAs<RecordType>()) {
1671 if (ClassTemplateSpecializationDecl *ClassTemplateSpec
1672 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) {
1673 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) {
1675 ClassTemplateSpec->setPointOfInstantiation(Loc);
1676 return InstantiateClassTemplateSpecialization(ClassTemplateSpec,
1677 TSK_ImplicitInstantiation,
1678 /*Complain=*/diag != 0);
1680 } else if (CXXRecordDecl *Rec
1681 = dyn_cast<CXXRecordDecl>(Record->getDecl())) {
1682 if (CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass()) {
1683 MemberSpecializationInfo *MSInfo = Rec->getMemberSpecializationInfo();
1684 assert(MSInfo && "Missing member specialization information?");
1685 // This record was instantiated from a class within a template.
1686 if (MSInfo->getTemplateSpecializationKind()
1687 != TSK_ExplicitSpecialization) {
1688 MSInfo->setPointOfInstantiation(Loc);
1689 return InstantiateClass(Loc, Rec, Pattern,
1690 getTemplateInstantiationArgs(Rec),
1691 TSK_ImplicitInstantiation,
1692 /*Complain=*/diag != 0);
1701 // We have an incomplete type. Produce a diagnostic.
1704 // If we have a note, produce it.
1705 if (!Note.first.isInvalid())
1706 Diag(Note.first, Note.second);
1708 // If the type was a forward declaration of a class/struct/union
1710 const TagType *Tag = 0;
1711 if (const RecordType *Record = T->getAs<RecordType>())
1713 else if (const EnumType *Enum = T->getAs<EnumType>())
1716 if (Tag && !Tag->getDecl()->isInvalidDecl())
1717 Diag(Tag->getDecl()->getLocation(),
1718 Tag->isBeingDefined() ? diag::note_type_being_defined
1719 : diag::note_forward_declaration)
1720 << QualType(Tag, 0);
1725 /// \brief Retrieve a version of the type 'T' that is qualified by the
1726 /// nested-name-specifier contained in SS.
1727 QualType Sema::getQualifiedNameType(const CXXScopeSpec &SS, QualType T) {
1728 if (!SS.isSet() || SS.isInvalid() || T.isNull())
1731 NestedNameSpecifier *NNS
1732 = static_cast<NestedNameSpecifier *>(SS.getScopeRep());
1733 return Context.getQualifiedNameType(NNS, T);
1736 QualType Sema::BuildTypeofExprType(Expr *E) {
1737 return Context.getTypeOfExprType(E);
1740 QualType Sema::BuildDecltypeType(Expr *E) {
1741 if (E->getType() == Context.OverloadTy) {
1742 Diag(E->getLocStart(),
1743 diag::err_cannot_determine_declared_type_of_overloaded_function);
1746 return Context.getDecltypeType(E);