SemaType.cpp revision b95faf5b7275f7d3d87f89f4e8bf840d7764af7a
1//===--- SemaType.cpp - Semantic Analysis for Types -----------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements type-related semantic analysis. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 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" 25using namespace clang; 26 27/// \brief Perform adjustment on the parameter type of a function. 28/// 29/// This routine adjusts the given parameter type @p T to the actual 30/// parameter type used by semantic analysis (C99 6.7.5.3p[7,8], 31/// C++ [dcl.fct]p3). The adjusted parameter type is returned. 32QualType Sema::adjustParameterType(QualType T) { 33 // C99 6.7.5.3p7: 34 // A declaration of a parameter as "array of type" shall be 35 // adjusted to "qualified pointer to type", where the type 36 // qualifiers (if any) are those specified within the [ and ] of 37 // the array type derivation. 38 if (T->isArrayType()) 39 return Context.getArrayDecayedType(T); 40 41 // C99 6.7.5.3p8: 42 // A declaration of a parameter as "function returning type" 43 // shall be adjusted to "pointer to function returning type", as 44 // in 6.3.2.1. 45 if (T->isFunctionType()) 46 return Context.getPointerType(T); 47 48 return T; 49} 50 51 52 53/// isOmittedBlockReturnType - Return true if this declarator is missing a 54/// return type because this is a omitted return type on a block literal. 55static bool isOmittedBlockReturnType(const Declarator &D, unsigned Skip) { 56 if (D.getContext() != Declarator::BlockLiteralContext || 57 Skip != 0 || D.getDeclSpec().hasTypeSpecifier()) 58 return false; 59 60 if (D.getNumTypeObjects() == 0) 61 return true; 62 63 if (D.getNumTypeObjects() == 1 && 64 D.getTypeObject(0).Kind == DeclaratorChunk::Function) 65 return true; 66 67 return false; 68} 69 70/// \brief Convert the specified declspec to the appropriate type 71/// object. 72/// \param D the declarator containing the declaration specifier. 73/// \returns The type described by the declaration specifiers. This function 74/// never returns null. 75static QualType ConvertDeclSpecToType(Declarator &TheDeclarator, unsigned Skip, 76 Sema &TheSema) { 77 // FIXME: Should move the logic from DeclSpec::Finish to here for validity 78 // checking. 79 const DeclSpec &DS = TheDeclarator.getDeclSpec(); 80 SourceLocation DeclLoc = TheDeclarator.getIdentifierLoc(); 81 if (DeclLoc.isInvalid()) 82 DeclLoc = DS.getSourceRange().getBegin(); 83 84 ASTContext &Context = TheSema.Context; 85 86 QualType Result; 87 switch (DS.getTypeSpecType()) { 88 case DeclSpec::TST_void: 89 Result = Context.VoidTy; 90 break; 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; 96 else { 97 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 98 "Unknown TSS value"); 99 Result = Context.UnsignedCharTy; 100 } 101 break; 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(); 109 } else { 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(); 115 } 116 break; 117 case DeclSpec::TST_char16: 118 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 119 "Unknown TSS value"); 120 Result = Context.Char16Ty; 121 break; 122 case DeclSpec::TST_char32: 123 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 124 "Unknown TSS value"); 125 Result = Context.Char32Ty; 126 break; 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()); 133 break; 134 } 135 136 // 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, Skip)) { 139 Result = Context.DependentTy; 140 break; 141 } 142 143 // 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 149 // case. 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. 153 if (DS.isEmpty()) { 154 TheSema.Diag(DeclLoc, diag::ext_missing_declspec) 155 << DS.getSourceRange() 156 << CodeModificationHint::CreateInsertion(DS.getSourceRange().getBegin(), 157 "int"); 158 } 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(); 169 170 // 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 172 // errors. 173 TheDeclarator.setInvalidType(true); 174 } else { 175 TheSema.Diag(DeclLoc, diag::ext_missing_type_specifier) 176 << DS.getSourceRange(); 177 } 178 } 179 180 // FALL THROUGH. 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; 189 190 // long long is a C99 feature. 191 if (!TheSema.getLangOptions().C99 && 192 !TheSema.getLangOptions().CPlusPlus0x) 193 TheSema.Diag(DS.getTypeSpecWidthLoc(), diag::ext_longlong); 194 break; 195 } 196 } else { 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; 203 204 // long long is a C99 feature. 205 if (!TheSema.getLangOptions().C99 && 206 !TheSema.getLangOptions().CPlusPlus0x) 207 TheSema.Diag(DS.getTypeSpecWidthLoc(), diag::ext_longlong); 208 break; 209 } 210 } 211 break; 212 } 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; 217 else 218 Result = Context.DoubleTy; 219 break; 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); 227 break; 228 case DeclSpec::TST_class: 229 case DeclSpec::TST_enum: 230 case DeclSpec::TST_union: 231 case DeclSpec::TST_struct: { 232 Decl *D = static_cast<Decl *>(DS.getTypeRep()); 233 if (!D) { 234 // This can happen in C++ with ambiguous lookups. 235 Result = Context.IntTy; 236 TheDeclarator.setInvalidType(true); 237 break; 238 } 239 240 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 241 DS.getTypeSpecSign() == 0 && 242 "Can't handle qualifiers on typedef names yet!"); 243 // TypeQuals handled by caller. 244 Result = Context.getTypeDeclType(cast<TypeDecl>(D)); 245 246 // In C++, make an ElaboratedType. 247 if (TheSema.getLangOptions().CPlusPlus) { 248 TagDecl::TagKind Tag 249 = TagDecl::getTagKindForTypeSpec(DS.getTypeSpecType()); 250 Result = Context.getElaboratedType(Result, Tag); 251 } 252 253 if (D->isInvalidDecl()) 254 TheDeclarator.setInvalidType(true); 255 break; 256 } 257 case DeclSpec::TST_typename: { 258 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 259 DS.getTypeSpecSign() == 0 && 260 "Can't handle qualifiers on typedef names yet!"); 261 Result = TheSema.GetTypeFromParser(DS.getTypeRep()); 262 263 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 264 if (const ObjCInterfaceType * 265 Interface = Result->getAs<ObjCInterfaceType>()) { 266 // It would be nice if protocol qualifiers were only stored with the 267 // ObjCObjectPointerType. Unfortunately, this isn't possible due 268 // to the following typedef idiom (which is uncommon, but allowed): 269 // 270 // typedef Foo<P> T; 271 // static void func() { 272 // Foo<P> *yy; 273 // T *zz; 274 // } 275 Result = Context.getObjCInterfaceType(Interface->getDecl(), 276 (ObjCProtocolDecl**)PQ, 277 DS.getNumProtocolQualifiers()); 278 } else if (Result->isObjCIdType()) 279 // id<protocol-list> 280 Result = Context.getObjCObjectPointerType(Context.ObjCBuiltinIdTy, 281 (ObjCProtocolDecl**)PQ, DS.getNumProtocolQualifiers()); 282 else if (Result->isObjCClassType()) { 283 // Class<protocol-list> 284 Result = Context.getObjCObjectPointerType(Context.ObjCBuiltinClassTy, 285 (ObjCProtocolDecl**)PQ, DS.getNumProtocolQualifiers()); 286 } else { 287 TheSema.Diag(DeclLoc, diag::err_invalid_protocol_qualifiers) 288 << DS.getSourceRange(); 289 TheDeclarator.setInvalidType(true); 290 } 291 } 292 293 // If this is a reference to an invalid typedef, propagate the invalidity. 294 if (TypedefType *TDT = dyn_cast<TypedefType>(Result)) 295 if (TDT->getDecl()->isInvalidDecl()) 296 TheDeclarator.setInvalidType(true); 297 298 // TypeQuals handled by caller. 299 break; 300 } 301 case DeclSpec::TST_typeofType: 302 // FIXME: Preserve type source info. 303 Result = TheSema.GetTypeFromParser(DS.getTypeRep()); 304 assert(!Result.isNull() && "Didn't get a type for typeof?"); 305 // TypeQuals handled by caller. 306 Result = Context.getTypeOfType(Result); 307 break; 308 case DeclSpec::TST_typeofExpr: { 309 Expr *E = static_cast<Expr *>(DS.getTypeRep()); 310 assert(E && "Didn't get an expression for typeof?"); 311 // TypeQuals handled by caller. 312 Result = Context.getTypeOfExprType(E); 313 break; 314 } 315 case DeclSpec::TST_decltype: { 316 Expr *E = static_cast<Expr *>(DS.getTypeRep()); 317 assert(E && "Didn't get an expression for decltype?"); 318 // TypeQuals handled by caller. 319 Result = TheSema.BuildDecltypeType(E); 320 if (Result.isNull()) { 321 Result = Context.IntTy; 322 TheDeclarator.setInvalidType(true); 323 } 324 break; 325 } 326 case DeclSpec::TST_auto: { 327 // TypeQuals handled by caller. 328 Result = Context.UndeducedAutoTy; 329 break; 330 } 331 332 case DeclSpec::TST_error: 333 Result = Context.IntTy; 334 TheDeclarator.setInvalidType(true); 335 break; 336 } 337 338 // Handle complex types. 339 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) { 340 if (TheSema.getLangOptions().Freestanding) 341 TheSema.Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex); 342 Result = Context.getComplexType(Result); 343 } 344 345 assert(DS.getTypeSpecComplex() != DeclSpec::TSC_imaginary && 346 "FIXME: imaginary types not supported yet!"); 347 348 // See if there are any attributes on the declspec that apply to the type (as 349 // opposed to the decl). 350 if (const AttributeList *AL = DS.getAttributes()) 351 TheSema.ProcessTypeAttributeList(Result, AL); 352 353 // Apply const/volatile/restrict qualifiers to T. 354 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 355 356 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 357 // or incomplete types shall not be restrict-qualified." C++ also allows 358 // restrict-qualified references. 359 if (TypeQuals & DeclSpec::TQ_restrict) { 360 if (Result->isPointerType() || Result->isReferenceType()) { 361 QualType EltTy = Result->isPointerType() ? 362 Result->getAs<PointerType>()->getPointeeType() : 363 Result->getAs<ReferenceType>()->getPointeeType(); 364 365 // If we have a pointer or reference, the pointee must have an object 366 // incomplete type. 367 if (!EltTy->isIncompleteOrObjectType()) { 368 TheSema.Diag(DS.getRestrictSpecLoc(), 369 diag::err_typecheck_invalid_restrict_invalid_pointee) 370 << EltTy << DS.getSourceRange(); 371 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 372 } 373 } else { 374 TheSema.Diag(DS.getRestrictSpecLoc(), 375 diag::err_typecheck_invalid_restrict_not_pointer) 376 << Result << DS.getSourceRange(); 377 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 378 } 379 } 380 381 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification 382 // of a function type includes any type qualifiers, the behavior is 383 // undefined." 384 if (Result->isFunctionType() && TypeQuals) { 385 // Get some location to point at, either the C or V location. 386 SourceLocation Loc; 387 if (TypeQuals & DeclSpec::TQ_const) 388 Loc = DS.getConstSpecLoc(); 389 else if (TypeQuals & DeclSpec::TQ_volatile) 390 Loc = DS.getVolatileSpecLoc(); 391 else { 392 assert((TypeQuals & DeclSpec::TQ_restrict) && 393 "Has CVR quals but not C, V, or R?"); 394 Loc = DS.getRestrictSpecLoc(); 395 } 396 TheSema.Diag(Loc, diag::warn_typecheck_function_qualifiers) 397 << Result << DS.getSourceRange(); 398 } 399 400 // C++ [dcl.ref]p1: 401 // Cv-qualified references are ill-formed except when the 402 // cv-qualifiers are introduced through the use of a typedef 403 // (7.1.3) or of a template type argument (14.3), in which 404 // case the cv-qualifiers are ignored. 405 // FIXME: Shouldn't we be checking SCS_typedef here? 406 if (DS.getTypeSpecType() == DeclSpec::TST_typename && 407 TypeQuals && Result->isReferenceType()) { 408 TypeQuals &= ~DeclSpec::TQ_const; 409 TypeQuals &= ~DeclSpec::TQ_volatile; 410 } 411 412 Qualifiers Quals = Qualifiers::fromCVRMask(TypeQuals); 413 Result = Context.getQualifiedType(Result, Quals); 414 } 415 416 return Result; 417} 418 419static std::string getPrintableNameForEntity(DeclarationName Entity) { 420 if (Entity) 421 return Entity.getAsString(); 422 423 return "type name"; 424} 425 426/// \brief Build a pointer type. 427/// 428/// \param T The type to which we'll be building a pointer. 429/// 430/// \param Quals The cvr-qualifiers to be applied to the pointer type. 431/// 432/// \param Loc The location of the entity whose type involves this 433/// pointer type or, if there is no such entity, the location of the 434/// type that will have pointer type. 435/// 436/// \param Entity The name of the entity that involves the pointer 437/// type, if known. 438/// 439/// \returns A suitable pointer type, if there are no 440/// errors. Otherwise, returns a NULL type. 441QualType Sema::BuildPointerType(QualType T, unsigned Quals, 442 SourceLocation Loc, DeclarationName Entity) { 443 if (T->isReferenceType()) { 444 // C++ 8.3.2p4: There shall be no ... pointers to references ... 445 Diag(Loc, diag::err_illegal_decl_pointer_to_reference) 446 << getPrintableNameForEntity(Entity); 447 return QualType(); 448 } 449 450 Qualifiers Qs = Qualifiers::fromCVRMask(Quals); 451 452 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 453 // object or incomplete types shall not be restrict-qualified." 454 if (Qs.hasRestrict() && !T->isIncompleteOrObjectType()) { 455 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 456 << T; 457 Qs.removeRestrict(); 458 } 459 460 // Build the pointer type. 461 return Context.getQualifiedType(Context.getPointerType(T), Qs); 462} 463 464/// \brief Build a reference type. 465/// 466/// \param T The type to which we'll be building a reference. 467/// 468/// \param CVR The cvr-qualifiers to be applied to the reference type. 469/// 470/// \param Loc The location of the entity whose type involves this 471/// reference type or, if there is no such entity, the location of the 472/// type that will have reference type. 473/// 474/// \param Entity The name of the entity that involves the reference 475/// type, if known. 476/// 477/// \returns A suitable reference type, if there are no 478/// errors. Otherwise, returns a NULL type. 479QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue, 480 unsigned CVR, SourceLocation Loc, 481 DeclarationName Entity) { 482 Qualifiers Quals = Qualifiers::fromCVRMask(CVR); 483 484 bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>(); 485 486 // C++0x [dcl.typedef]p9: If a typedef TD names a type that is a 487 // reference to a type T, and attempt to create the type "lvalue 488 // reference to cv TD" creates the type "lvalue reference to T". 489 // We use the qualifiers (restrict or none) of the original reference, 490 // not the new ones. This is consistent with GCC. 491 492 // C++ [dcl.ref]p4: There shall be no references to references. 493 // 494 // According to C++ DR 106, references to references are only 495 // diagnosed when they are written directly (e.g., "int & &"), 496 // but not when they happen via a typedef: 497 // 498 // typedef int& intref; 499 // typedef intref& intref2; 500 // 501 // Parser::ParseDeclaratorInternal diagnoses the case where 502 // references are written directly; here, we handle the 503 // collapsing of references-to-references as described in C++ 504 // DR 106 and amended by C++ DR 540. 505 506 // C++ [dcl.ref]p1: 507 // A declarator that specifies the type "reference to cv void" 508 // is ill-formed. 509 if (T->isVoidType()) { 510 Diag(Loc, diag::err_reference_to_void); 511 return QualType(); 512 } 513 514 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 515 // object or incomplete types shall not be restrict-qualified." 516 if (Quals.hasRestrict() && !T->isIncompleteOrObjectType()) { 517 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 518 << T; 519 Quals.removeRestrict(); 520 } 521 522 // C++ [dcl.ref]p1: 523 // [...] Cv-qualified references are ill-formed except when the 524 // cv-qualifiers are introduced through the use of a typedef 525 // (7.1.3) or of a template type argument (14.3), in which case 526 // the cv-qualifiers are ignored. 527 // 528 // We diagnose extraneous cv-qualifiers for the non-typedef, 529 // non-template type argument case within the parser. Here, we just 530 // ignore any extraneous cv-qualifiers. 531 Quals.removeConst(); 532 Quals.removeVolatile(); 533 534 // Handle restrict on references. 535 if (LValueRef) 536 return Context.getQualifiedType( 537 Context.getLValueReferenceType(T, SpelledAsLValue), Quals); 538 return Context.getQualifiedType(Context.getRValueReferenceType(T), Quals); 539} 540 541/// \brief Build an array type. 542/// 543/// \param T The type of each element in the array. 544/// 545/// \param ASM C99 array size modifier (e.g., '*', 'static'). 546/// 547/// \param ArraySize Expression describing the size of the array. 548/// 549/// \param Quals The cvr-qualifiers to be applied to the array's 550/// element type. 551/// 552/// \param Loc The location of the entity whose type involves this 553/// array type or, if there is no such entity, the location of the 554/// type that will have array type. 555/// 556/// \param Entity The name of the entity that involves the array 557/// type, if known. 558/// 559/// \returns A suitable array type, if there are no errors. Otherwise, 560/// returns a NULL type. 561QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM, 562 Expr *ArraySize, unsigned Quals, 563 SourceRange Brackets, DeclarationName Entity) { 564 565 SourceLocation Loc = Brackets.getBegin(); 566 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 567 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 568 if (RequireCompleteType(Loc, T, 569 diag::err_illegal_decl_array_incomplete_type)) 570 return QualType(); 571 572 if (T->isFunctionType()) { 573 Diag(Loc, diag::err_illegal_decl_array_of_functions) 574 << getPrintableNameForEntity(Entity); 575 return QualType(); 576 } 577 578 // C++ 8.3.2p4: There shall be no ... arrays of references ... 579 if (T->isReferenceType()) { 580 Diag(Loc, diag::err_illegal_decl_array_of_references) 581 << getPrintableNameForEntity(Entity); 582 return QualType(); 583 } 584 585 if (Context.getCanonicalType(T) == Context.UndeducedAutoTy) { 586 Diag(Loc, diag::err_illegal_decl_array_of_auto) 587 << getPrintableNameForEntity(Entity); 588 return QualType(); 589 } 590 591 if (const RecordType *EltTy = T->getAs<RecordType>()) { 592 // If the element type is a struct or union that contains a variadic 593 // array, accept it as a GNU extension: C99 6.7.2.1p2. 594 if (EltTy->getDecl()->hasFlexibleArrayMember()) 595 Diag(Loc, diag::ext_flexible_array_in_array) << T; 596 } else if (T->isObjCInterfaceType()) { 597 Diag(Loc, diag::err_objc_array_of_interfaces) << T; 598 return QualType(); 599 } 600 601 // C99 6.7.5.2p1: The size expression shall have integer type. 602 if (ArraySize && !ArraySize->isTypeDependent() && 603 !ArraySize->getType()->isIntegerType()) { 604 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 605 << ArraySize->getType() << ArraySize->getSourceRange(); 606 ArraySize->Destroy(Context); 607 return QualType(); 608 } 609 llvm::APSInt ConstVal(32); 610 if (!ArraySize) { 611 if (ASM == ArrayType::Star) 612 T = Context.getVariableArrayType(T, 0, ASM, Quals, Brackets); 613 else 614 T = Context.getIncompleteArrayType(T, ASM, Quals); 615 } else if (ArraySize->isValueDependent()) { 616 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets); 617 } else if (!ArraySize->isIntegerConstantExpr(ConstVal, Context) || 618 (!T->isDependentType() && !T->isConstantSizeType())) { 619 // Per C99, a variable array is an array with either a non-constant 620 // size or an element type that has a non-constant-size 621 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets); 622 } else { 623 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 624 // have a value greater than zero. 625 if (ConstVal.isSigned()) { 626 if (ConstVal.isNegative()) { 627 Diag(ArraySize->getLocStart(), 628 diag::err_typecheck_negative_array_size) 629 << ArraySize->getSourceRange(); 630 return QualType(); 631 } else if (ConstVal == 0) { 632 // GCC accepts zero sized static arrays. 633 Diag(ArraySize->getLocStart(), diag::ext_typecheck_zero_array_size) 634 << ArraySize->getSourceRange(); 635 } 636 } 637 T = Context.getConstantArrayType(T, ConstVal, ASM, Quals); 638 } 639 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 640 if (!getLangOptions().C99) { 641 if (ArraySize && !ArraySize->isTypeDependent() && 642 !ArraySize->isValueDependent() && 643 !ArraySize->isIntegerConstantExpr(Context)) 644 Diag(Loc, getLangOptions().CPlusPlus? diag::err_vla_cxx : diag::ext_vla); 645 else if (ASM != ArrayType::Normal || Quals != 0) 646 Diag(Loc, 647 getLangOptions().CPlusPlus? diag::err_c99_array_usage_cxx 648 : diag::ext_c99_array_usage); 649 } 650 651 return T; 652} 653 654/// \brief Build an ext-vector type. 655/// 656/// Run the required checks for the extended vector type. 657QualType Sema::BuildExtVectorType(QualType T, ExprArg ArraySize, 658 SourceLocation AttrLoc) { 659 660 Expr *Arg = (Expr *)ArraySize.get(); 661 662 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 663 // in conjunction with complex types (pointers, arrays, functions, etc.). 664 if (!T->isDependentType() && 665 !T->isIntegerType() && !T->isRealFloatingType()) { 666 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T; 667 return QualType(); 668 } 669 670 if (!Arg->isTypeDependent() && !Arg->isValueDependent()) { 671 llvm::APSInt vecSize(32); 672 if (!Arg->isIntegerConstantExpr(vecSize, Context)) { 673 Diag(AttrLoc, diag::err_attribute_argument_not_int) 674 << "ext_vector_type" << Arg->getSourceRange(); 675 return QualType(); 676 } 677 678 // unlike gcc's vector_size attribute, the size is specified as the 679 // number of elements, not the number of bytes. 680 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 681 682 if (vectorSize == 0) { 683 Diag(AttrLoc, diag::err_attribute_zero_size) 684 << Arg->getSourceRange(); 685 return QualType(); 686 } 687 688 if (!T->isDependentType()) 689 return Context.getExtVectorType(T, vectorSize); 690 } 691 692 return Context.getDependentSizedExtVectorType(T, ArraySize.takeAs<Expr>(), 693 AttrLoc); 694} 695 696/// \brief Build a function type. 697/// 698/// This routine checks the function type according to C++ rules and 699/// under the assumption that the result type and parameter types have 700/// just been instantiated from a template. It therefore duplicates 701/// some of the behavior of GetTypeForDeclarator, but in a much 702/// simpler form that is only suitable for this narrow use case. 703/// 704/// \param T The return type of the function. 705/// 706/// \param ParamTypes The parameter types of the function. This array 707/// will be modified to account for adjustments to the types of the 708/// function parameters. 709/// 710/// \param NumParamTypes The number of parameter types in ParamTypes. 711/// 712/// \param Variadic Whether this is a variadic function type. 713/// 714/// \param Quals The cvr-qualifiers to be applied to the function type. 715/// 716/// \param Loc The location of the entity whose type involves this 717/// function type or, if there is no such entity, the location of the 718/// type that will have function type. 719/// 720/// \param Entity The name of the entity that involves the function 721/// type, if known. 722/// 723/// \returns A suitable function type, if there are no 724/// errors. Otherwise, returns a NULL type. 725QualType Sema::BuildFunctionType(QualType T, 726 QualType *ParamTypes, 727 unsigned NumParamTypes, 728 bool Variadic, unsigned Quals, 729 SourceLocation Loc, DeclarationName Entity) { 730 if (T->isArrayType() || T->isFunctionType()) { 731 Diag(Loc, diag::err_func_returning_array_function) << T; 732 return QualType(); 733 } 734 735 bool Invalid = false; 736 for (unsigned Idx = 0; Idx < NumParamTypes; ++Idx) { 737 QualType ParamType = adjustParameterType(ParamTypes[Idx]); 738 if (ParamType->isVoidType()) { 739 Diag(Loc, diag::err_param_with_void_type); 740 Invalid = true; 741 } 742 743 ParamTypes[Idx] = ParamType; 744 } 745 746 if (Invalid) 747 return QualType(); 748 749 return Context.getFunctionType(T, ParamTypes, NumParamTypes, Variadic, 750 Quals); 751} 752 753/// \brief Build a member pointer type \c T Class::*. 754/// 755/// \param T the type to which the member pointer refers. 756/// \param Class the class type into which the member pointer points. 757/// \param CVR Qualifiers applied to the member pointer type 758/// \param Loc the location where this type begins 759/// \param Entity the name of the entity that will have this member pointer type 760/// 761/// \returns a member pointer type, if successful, or a NULL type if there was 762/// an error. 763QualType Sema::BuildMemberPointerType(QualType T, QualType Class, 764 unsigned CVR, SourceLocation Loc, 765 DeclarationName Entity) { 766 Qualifiers Quals = Qualifiers::fromCVRMask(CVR); 767 768 // Verify that we're not building a pointer to pointer to function with 769 // exception specification. 770 if (CheckDistantExceptionSpec(T)) { 771 Diag(Loc, diag::err_distant_exception_spec); 772 773 // FIXME: If we're doing this as part of template instantiation, 774 // we should return immediately. 775 776 // Build the type anyway, but use the canonical type so that the 777 // exception specifiers are stripped off. 778 T = Context.getCanonicalType(T); 779 } 780 781 // C++ 8.3.3p3: A pointer to member shall not pointer to ... a member 782 // with reference type, or "cv void." 783 if (T->isReferenceType()) { 784 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference) 785 << (Entity? Entity.getAsString() : "type name"); 786 return QualType(); 787 } 788 789 if (T->isVoidType()) { 790 Diag(Loc, diag::err_illegal_decl_mempointer_to_void) 791 << (Entity? Entity.getAsString() : "type name"); 792 return QualType(); 793 } 794 795 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 796 // object or incomplete types shall not be restrict-qualified." 797 if (Quals.hasRestrict() && !T->isIncompleteOrObjectType()) { 798 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 799 << T; 800 801 // FIXME: If we're doing this as part of template instantiation, 802 // we should return immediately. 803 Quals.removeRestrict(); 804 } 805 806 if (!Class->isDependentType() && !Class->isRecordType()) { 807 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class; 808 return QualType(); 809 } 810 811 return Context.getQualifiedType( 812 Context.getMemberPointerType(T, Class.getTypePtr()), Quals); 813} 814 815/// \brief Build a block pointer type. 816/// 817/// \param T The type to which we'll be building a block pointer. 818/// 819/// \param CVR The cvr-qualifiers to be applied to the block pointer type. 820/// 821/// \param Loc The location of the entity whose type involves this 822/// block pointer type or, if there is no such entity, the location of the 823/// type that will have block pointer type. 824/// 825/// \param Entity The name of the entity that involves the block pointer 826/// type, if known. 827/// 828/// \returns A suitable block pointer type, if there are no 829/// errors. Otherwise, returns a NULL type. 830QualType Sema::BuildBlockPointerType(QualType T, unsigned CVR, 831 SourceLocation Loc, 832 DeclarationName Entity) { 833 if (!T->isFunctionType()) { 834 Diag(Loc, diag::err_nonfunction_block_type); 835 return QualType(); 836 } 837 838 Qualifiers Quals = Qualifiers::fromCVRMask(CVR); 839 return Context.getQualifiedType(Context.getBlockPointerType(T), Quals); 840} 841 842QualType Sema::GetTypeFromParser(TypeTy *Ty, DeclaratorInfo **DInfo) { 843 QualType QT = QualType::getFromOpaquePtr(Ty); 844 DeclaratorInfo *DI = 0; 845 if (LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) { 846 QT = LIT->getType(); 847 DI = LIT->getDeclaratorInfo(); 848 } 849 850 if (DInfo) *DInfo = DI; 851 return QT; 852} 853 854/// GetTypeForDeclarator - Convert the type for the specified 855/// declarator to Type instances. Skip the outermost Skip type 856/// objects. 857/// 858/// If OwnedDecl is non-NULL, and this declarator's decl-specifier-seq 859/// owns the declaration of a type (e.g., the definition of a struct 860/// type), then *OwnedDecl will receive the owned declaration. 861QualType Sema::GetTypeForDeclarator(Declarator &D, Scope *S, 862 DeclaratorInfo **DInfo, unsigned Skip, 863 TagDecl **OwnedDecl) { 864 // Determine the type of the declarator. Not all forms of declarator 865 // have a type. 866 QualType T; 867 868 switch (D.getKind()) { 869 case Declarator::DK_Abstract: 870 case Declarator::DK_Normal: 871 case Declarator::DK_Operator: 872 case Declarator::DK_TemplateId: 873 T = ConvertDeclSpecToType(D, Skip, *this); 874 875 if (!D.isInvalidType() && OwnedDecl && D.getDeclSpec().isTypeSpecOwned()) 876 *OwnedDecl = cast<TagDecl>((Decl *)D.getDeclSpec().getTypeRep()); 877 break; 878 879 case Declarator::DK_Constructor: 880 case Declarator::DK_Destructor: 881 case Declarator::DK_Conversion: 882 // Constructors and destructors don't have return types. Use 883 // "void" instead. Conversion operators will check their return 884 // types separately. 885 T = Context.VoidTy; 886 break; 887 } 888 889 if (T == Context.UndeducedAutoTy) { 890 int Error = -1; 891 892 switch (D.getContext()) { 893 case Declarator::KNRTypeListContext: 894 assert(0 && "K&R type lists aren't allowed in C++"); 895 break; 896 case Declarator::PrototypeContext: 897 Error = 0; // Function prototype 898 break; 899 case Declarator::MemberContext: 900 switch (cast<TagDecl>(CurContext)->getTagKind()) { 901 case TagDecl::TK_enum: assert(0 && "unhandled tag kind"); break; 902 case TagDecl::TK_struct: Error = 1; /* Struct member */ break; 903 case TagDecl::TK_union: Error = 2; /* Union member */ break; 904 case TagDecl::TK_class: Error = 3; /* Class member */ break; 905 } 906 break; 907 case Declarator::CXXCatchContext: 908 Error = 4; // Exception declaration 909 break; 910 case Declarator::TemplateParamContext: 911 Error = 5; // Template parameter 912 break; 913 case Declarator::BlockLiteralContext: 914 Error = 6; // Block literal 915 break; 916 case Declarator::FileContext: 917 case Declarator::BlockContext: 918 case Declarator::ForContext: 919 case Declarator::ConditionContext: 920 case Declarator::TypeNameContext: 921 break; 922 } 923 924 if (Error != -1) { 925 Diag(D.getDeclSpec().getTypeSpecTypeLoc(), diag::err_auto_not_allowed) 926 << Error; 927 T = Context.IntTy; 928 D.setInvalidType(true); 929 } 930 } 931 932 // The name we're declaring, if any. 933 DeclarationName Name; 934 if (D.getIdentifier()) 935 Name = D.getIdentifier(); 936 937 // Walk the DeclTypeInfo, building the recursive type as we go. 938 // DeclTypeInfos are ordered from the identifier out, which is 939 // opposite of what we want :). 940 for (unsigned i = Skip, e = D.getNumTypeObjects(); i != e; ++i) { 941 DeclaratorChunk &DeclType = D.getTypeObject(e-i-1+Skip); 942 switch (DeclType.Kind) { 943 default: assert(0 && "Unknown decltype!"); 944 case DeclaratorChunk::BlockPointer: 945 // If blocks are disabled, emit an error. 946 if (!LangOpts.Blocks) 947 Diag(DeclType.Loc, diag::err_blocks_disable); 948 949 T = BuildBlockPointerType(T, DeclType.Cls.TypeQuals, D.getIdentifierLoc(), 950 Name); 951 break; 952 case DeclaratorChunk::Pointer: 953 // Verify that we're not building a pointer to pointer to function with 954 // exception specification. 955 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 956 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 957 D.setInvalidType(true); 958 // Build the type anyway. 959 } 960 if (getLangOptions().ObjC1 && T->isObjCInterfaceType()) { 961 const ObjCInterfaceType *OIT = T->getAs<ObjCInterfaceType>(); 962 T = Context.getObjCObjectPointerType(T, 963 (ObjCProtocolDecl **)OIT->qual_begin(), 964 OIT->getNumProtocols()); 965 break; 966 } 967 T = BuildPointerType(T, DeclType.Ptr.TypeQuals, DeclType.Loc, Name); 968 break; 969 case DeclaratorChunk::Reference: { 970 Qualifiers Quals; 971 if (DeclType.Ref.HasRestrict) Quals.addRestrict(); 972 973 // Verify that we're not building a reference to pointer to function with 974 // exception specification. 975 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 976 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 977 D.setInvalidType(true); 978 // Build the type anyway. 979 } 980 T = BuildReferenceType(T, DeclType.Ref.LValueRef, Quals, 981 DeclType.Loc, Name); 982 break; 983 } 984 case DeclaratorChunk::Array: { 985 // Verify that we're not building an array of pointers to function with 986 // exception specification. 987 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 988 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 989 D.setInvalidType(true); 990 // Build the type anyway. 991 } 992 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 993 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 994 ArrayType::ArraySizeModifier ASM; 995 if (ATI.isStar) 996 ASM = ArrayType::Star; 997 else if (ATI.hasStatic) 998 ASM = ArrayType::Static; 999 else 1000 ASM = ArrayType::Normal; 1001 if (ASM == ArrayType::Star && 1002 D.getContext() != Declarator::PrototypeContext) { 1003 // FIXME: This check isn't quite right: it allows star in prototypes 1004 // for function definitions, and disallows some edge cases detailed 1005 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html 1006 Diag(DeclType.Loc, diag::err_array_star_outside_prototype); 1007 ASM = ArrayType::Normal; 1008 D.setInvalidType(true); 1009 } 1010 T = BuildArrayType(T, ASM, ArraySize, 1011 Qualifiers::fromCVRMask(ATI.TypeQuals), 1012 SourceRange(DeclType.Loc, DeclType.EndLoc), Name); 1013 break; 1014 } 1015 case DeclaratorChunk::Function: { 1016 // If the function declarator has a prototype (i.e. it is not () and 1017 // does not have a K&R-style identifier list), then the arguments are part 1018 // of the type, otherwise the argument list is (). 1019 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 1020 1021 // C99 6.7.5.3p1: The return type may not be a function or array type. 1022 if (T->isArrayType() || T->isFunctionType()) { 1023 Diag(DeclType.Loc, diag::err_func_returning_array_function) << T; 1024 T = Context.IntTy; 1025 D.setInvalidType(true); 1026 } 1027 1028 if (getLangOptions().CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) { 1029 // C++ [dcl.fct]p6: 1030 // Types shall not be defined in return or parameter types. 1031 TagDecl *Tag = cast<TagDecl>((Decl *)D.getDeclSpec().getTypeRep()); 1032 if (Tag->isDefinition()) 1033 Diag(Tag->getLocation(), diag::err_type_defined_in_result_type) 1034 << Context.getTypeDeclType(Tag); 1035 } 1036 1037 // Exception specs are not allowed in typedefs. Complain, but add it 1038 // anyway. 1039 if (FTI.hasExceptionSpec && 1040 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1041 Diag(FTI.getThrowLoc(), diag::err_exception_spec_in_typedef); 1042 1043 if (FTI.NumArgs == 0) { 1044 if (getLangOptions().CPlusPlus) { 1045 // C++ 8.3.5p2: If the parameter-declaration-clause is empty, the 1046 // function takes no arguments. 1047 llvm::SmallVector<QualType, 4> Exceptions; 1048 Exceptions.reserve(FTI.NumExceptions); 1049 for (unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) { 1050 // FIXME: Preserve type source info. 1051 QualType ET = GetTypeFromParser(FTI.Exceptions[ei].Ty); 1052 // Check that the type is valid for an exception spec, and drop it 1053 // if not. 1054 if (!CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range)) 1055 Exceptions.push_back(ET); 1056 } 1057 T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic, FTI.TypeQuals, 1058 FTI.hasExceptionSpec, 1059 FTI.hasAnyExceptionSpec, 1060 Exceptions.size(), Exceptions.data()); 1061 } else if (FTI.isVariadic) { 1062 // We allow a zero-parameter variadic function in C if the 1063 // function is marked with the "overloadable" 1064 // attribute. Scan for this attribute now. 1065 bool Overloadable = false; 1066 for (const AttributeList *Attrs = D.getAttributes(); 1067 Attrs; Attrs = Attrs->getNext()) { 1068 if (Attrs->getKind() == AttributeList::AT_overloadable) { 1069 Overloadable = true; 1070 break; 1071 } 1072 } 1073 1074 if (!Overloadable) 1075 Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); 1076 T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic, 0); 1077 } else { 1078 // Simple void foo(), where the incoming T is the result type. 1079 T = Context.getFunctionNoProtoType(T); 1080 } 1081 } else if (FTI.ArgInfo[0].Param == 0) { 1082 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function definition. 1083 Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 1084 D.setInvalidType(true); 1085 } else { 1086 // Otherwise, we have a function with an argument list that is 1087 // potentially variadic. 1088 llvm::SmallVector<QualType, 16> ArgTys; 1089 1090 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 1091 ParmVarDecl *Param = 1092 cast<ParmVarDecl>(FTI.ArgInfo[i].Param.getAs<Decl>()); 1093 QualType ArgTy = Param->getType(); 1094 assert(!ArgTy.isNull() && "Couldn't parse type?"); 1095 1096 // Adjust the parameter type. 1097 assert((ArgTy == adjustParameterType(ArgTy)) && "Unadjusted type?"); 1098 1099 // Look for 'void'. void is allowed only as a single argument to a 1100 // function with no other parameters (C99 6.7.5.3p10). We record 1101 // int(void) as a FunctionProtoType with an empty argument list. 1102 if (ArgTy->isVoidType()) { 1103 // If this is something like 'float(int, void)', reject it. 'void' 1104 // is an incomplete type (C99 6.2.5p19) and function decls cannot 1105 // have arguments of incomplete type. 1106 if (FTI.NumArgs != 1 || FTI.isVariadic) { 1107 Diag(DeclType.Loc, diag::err_void_only_param); 1108 ArgTy = Context.IntTy; 1109 Param->setType(ArgTy); 1110 } else if (FTI.ArgInfo[i].Ident) { 1111 // Reject, but continue to parse 'int(void abc)'. 1112 Diag(FTI.ArgInfo[i].IdentLoc, 1113 diag::err_param_with_void_type); 1114 ArgTy = Context.IntTy; 1115 Param->setType(ArgTy); 1116 } else { 1117 // Reject, but continue to parse 'float(const void)'. 1118 if (ArgTy.hasQualifiers()) 1119 Diag(DeclType.Loc, diag::err_void_param_qualified); 1120 1121 // Do not add 'void' to the ArgTys list. 1122 break; 1123 } 1124 } else if (!FTI.hasPrototype) { 1125 if (ArgTy->isPromotableIntegerType()) { 1126 ArgTy = Context.getPromotedIntegerType(ArgTy); 1127 } else if (const BuiltinType* BTy = ArgTy->getAs<BuiltinType>()) { 1128 if (BTy->getKind() == BuiltinType::Float) 1129 ArgTy = Context.DoubleTy; 1130 } 1131 } 1132 1133 ArgTys.push_back(ArgTy); 1134 } 1135 1136 llvm::SmallVector<QualType, 4> Exceptions; 1137 Exceptions.reserve(FTI.NumExceptions); 1138 for (unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) { 1139 // FIXME: Preserve type source info. 1140 QualType ET = GetTypeFromParser(FTI.Exceptions[ei].Ty); 1141 // Check that the type is valid for an exception spec, and drop it if 1142 // not. 1143 if (!CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range)) 1144 Exceptions.push_back(ET); 1145 } 1146 1147 T = Context.getFunctionType(T, ArgTys.data(), ArgTys.size(), 1148 FTI.isVariadic, FTI.TypeQuals, 1149 FTI.hasExceptionSpec, 1150 FTI.hasAnyExceptionSpec, 1151 Exceptions.size(), Exceptions.data()); 1152 } 1153 break; 1154 } 1155 case DeclaratorChunk::MemberPointer: 1156 // Verify that we're not building a pointer to pointer to function with 1157 // exception specification. 1158 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 1159 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 1160 D.setInvalidType(true); 1161 // Build the type anyway. 1162 } 1163 // The scope spec must refer to a class, or be dependent. 1164 QualType ClsType; 1165 if (isDependentScopeSpecifier(DeclType.Mem.Scope())) { 1166 NestedNameSpecifier *NNS 1167 = (NestedNameSpecifier *)DeclType.Mem.Scope().getScopeRep(); 1168 assert(NNS->getAsType() && "Nested-name-specifier must name a type"); 1169 ClsType = QualType(NNS->getAsType(), 0); 1170 } else if (CXXRecordDecl *RD 1171 = dyn_cast_or_null<CXXRecordDecl>( 1172 computeDeclContext(DeclType.Mem.Scope()))) { 1173 ClsType = Context.getTagDeclType(RD); 1174 } else { 1175 Diag(DeclType.Mem.Scope().getBeginLoc(), 1176 diag::err_illegal_decl_mempointer_in_nonclass) 1177 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 1178 << DeclType.Mem.Scope().getRange(); 1179 D.setInvalidType(true); 1180 } 1181 1182 if (!ClsType.isNull()) 1183 T = BuildMemberPointerType(T, ClsType, DeclType.Mem.TypeQuals, 1184 DeclType.Loc, D.getIdentifier()); 1185 if (T.isNull()) { 1186 T = Context.IntTy; 1187 D.setInvalidType(true); 1188 } 1189 break; 1190 } 1191 1192 if (T.isNull()) { 1193 D.setInvalidType(true); 1194 T = Context.IntTy; 1195 } 1196 1197 // See if there are any attributes on this declarator chunk. 1198 if (const AttributeList *AL = DeclType.getAttrs()) 1199 ProcessTypeAttributeList(T, AL); 1200 } 1201 1202 if (getLangOptions().CPlusPlus && T->isFunctionType()) { 1203 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>(); 1204 assert(FnTy && "Why oh why is there not a FunctionProtoType here?"); 1205 1206 // C++ 8.3.5p4: A cv-qualifier-seq shall only be part of the function type 1207 // for a nonstatic member function, the function type to which a pointer 1208 // to member refers, or the top-level function type of a function typedef 1209 // declaration. 1210 if (FnTy->getTypeQuals() != 0 && 1211 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 1212 ((D.getContext() != Declarator::MemberContext && 1213 (!D.getCXXScopeSpec().isSet() || 1214 !computeDeclContext(D.getCXXScopeSpec(), /*FIXME:*/true) 1215 ->isRecord())) || 1216 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static)) { 1217 if (D.isFunctionDeclarator()) 1218 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_function_type); 1219 else 1220 Diag(D.getIdentifierLoc(), 1221 diag::err_invalid_qualified_typedef_function_type_use); 1222 1223 // Strip the cv-quals from the type. 1224 T = Context.getFunctionType(FnTy->getResultType(), FnTy->arg_type_begin(), 1225 FnTy->getNumArgs(), FnTy->isVariadic(), 0); 1226 } 1227 } 1228 1229 // If there were any type attributes applied to the decl itself (not the 1230 // type, apply the type attribute to the type!) 1231 if (const AttributeList *Attrs = D.getAttributes()) 1232 ProcessTypeAttributeList(T, Attrs); 1233 1234 if (DInfo) { 1235 if (D.isInvalidType()) 1236 *DInfo = 0; 1237 else 1238 *DInfo = GetDeclaratorInfoForDeclarator(D, T, Skip); 1239 } 1240 1241 return T; 1242} 1243 1244namespace { 1245 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> { 1246 const DeclSpec &DS; 1247 1248 public: 1249 TypeSpecLocFiller(const DeclSpec &DS) : DS(DS) {} 1250 1251 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 1252 Visit(TL.getUnqualifiedLoc()); 1253 } 1254 void VisitTypedefTypeLoc(TypedefTypeLoc TL) { 1255 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 1256 } 1257 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) { 1258 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 1259 1260 if (DS.getProtocolQualifiers()) { 1261 assert(TL.getNumProtocols() > 0); 1262 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 1263 TL.setLAngleLoc(DS.getProtocolLAngleLoc()); 1264 TL.setRAngleLoc(DS.getSourceRange().getEnd()); 1265 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i) 1266 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]); 1267 } else { 1268 assert(TL.getNumProtocols() == 0); 1269 TL.setLAngleLoc(SourceLocation()); 1270 TL.setRAngleLoc(SourceLocation()); 1271 } 1272 } 1273 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 1274 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 1275 1276 TL.setStarLoc(SourceLocation()); 1277 1278 if (DS.getProtocolQualifiers()) { 1279 assert(TL.getNumProtocols() > 0); 1280 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 1281 TL.setHasProtocolsAsWritten(true); 1282 TL.setLAngleLoc(DS.getProtocolLAngleLoc()); 1283 TL.setRAngleLoc(DS.getSourceRange().getEnd()); 1284 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i) 1285 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]); 1286 1287 } else { 1288 assert(TL.getNumProtocols() == 0); 1289 TL.setHasProtocolsAsWritten(false); 1290 TL.setLAngleLoc(SourceLocation()); 1291 TL.setRAngleLoc(SourceLocation()); 1292 } 1293 1294 // This might not have been written with an inner type. 1295 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) { 1296 TL.setHasBaseTypeAsWritten(false); 1297 TL.getBaseTypeLoc().initialize(SourceLocation()); 1298 } else { 1299 TL.setHasBaseTypeAsWritten(true); 1300 Visit(TL.getBaseTypeLoc()); 1301 } 1302 } 1303 void VisitTypeLoc(TypeLoc TL) { 1304 // FIXME: add other typespec types and change this to an assert. 1305 TL.initialize(DS.getTypeSpecTypeLoc()); 1306 } 1307 }; 1308 1309 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> { 1310 const DeclaratorChunk &Chunk; 1311 1312 public: 1313 DeclaratorLocFiller(const DeclaratorChunk &Chunk) : Chunk(Chunk) {} 1314 1315 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 1316 llvm::llvm_unreachable("qualified type locs not expected here!"); 1317 } 1318 1319 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) { 1320 assert(Chunk.Kind == DeclaratorChunk::BlockPointer); 1321 TL.setCaretLoc(Chunk.Loc); 1322 } 1323 void VisitPointerTypeLoc(PointerTypeLoc TL) { 1324 assert(Chunk.Kind == DeclaratorChunk::Pointer); 1325 TL.setStarLoc(Chunk.Loc); 1326 } 1327 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 1328 assert(Chunk.Kind == DeclaratorChunk::Pointer); 1329 TL.setStarLoc(Chunk.Loc); 1330 TL.setHasBaseTypeAsWritten(true); 1331 TL.setHasProtocolsAsWritten(false); 1332 TL.setLAngleLoc(SourceLocation()); 1333 TL.setRAngleLoc(SourceLocation()); 1334 } 1335 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) { 1336 assert(Chunk.Kind == DeclaratorChunk::MemberPointer); 1337 TL.setStarLoc(Chunk.Loc); 1338 // FIXME: nested name specifier 1339 } 1340 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) { 1341 assert(Chunk.Kind == DeclaratorChunk::Reference); 1342 // 'Amp' is misleading: this might have been originally 1343 /// spelled with AmpAmp. 1344 TL.setAmpLoc(Chunk.Loc); 1345 } 1346 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) { 1347 assert(Chunk.Kind == DeclaratorChunk::Reference); 1348 assert(!Chunk.Ref.LValueRef); 1349 TL.setAmpAmpLoc(Chunk.Loc); 1350 } 1351 void VisitArrayTypeLoc(ArrayTypeLoc TL) { 1352 assert(Chunk.Kind == DeclaratorChunk::Array); 1353 TL.setLBracketLoc(Chunk.Loc); 1354 TL.setRBracketLoc(Chunk.EndLoc); 1355 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts)); 1356 } 1357 void VisitFunctionTypeLoc(FunctionTypeLoc TL) { 1358 assert(Chunk.Kind == DeclaratorChunk::Function); 1359 TL.setLParenLoc(Chunk.Loc); 1360 TL.setRParenLoc(Chunk.EndLoc); 1361 1362 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun; 1363 for (unsigned i = 0, e = TL.getNumArgs(), tpi = 0; i != e; ++i) { 1364 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 1365 TL.setArg(tpi++, Param); 1366 } 1367 // FIXME: exception specs 1368 } 1369 1370 void VisitTypeLoc(TypeLoc TL) { 1371 llvm::llvm_unreachable("unsupported TypeLoc kind in declarator!"); 1372 } 1373 }; 1374} 1375 1376/// \brief Create and instantiate a DeclaratorInfo with type source information. 1377/// 1378/// \param T QualType referring to the type as written in source code. 1379DeclaratorInfo * 1380Sema::GetDeclaratorInfoForDeclarator(Declarator &D, QualType T, unsigned Skip) { 1381 DeclaratorInfo *DInfo = Context.CreateDeclaratorInfo(T); 1382 UnqualTypeLoc CurrTL = DInfo->getTypeLoc().getUnqualifiedLoc(); 1383 1384 for (unsigned i = Skip, e = D.getNumTypeObjects(); i != e; ++i) { 1385 DeclaratorLocFiller(D.getTypeObject(i)).Visit(CurrTL); 1386 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 1387 } 1388 1389 TypeSpecLocFiller(D.getDeclSpec()).Visit(CurrTL); 1390 1391 return DInfo; 1392} 1393 1394/// \brief Create a LocInfoType to hold the given QualType and DeclaratorInfo. 1395QualType Sema::CreateLocInfoType(QualType T, DeclaratorInfo *DInfo) { 1396 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser 1397 // and Sema during declaration parsing. Try deallocating/caching them when 1398 // it's appropriate, instead of allocating them and keeping them around. 1399 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType), 8); 1400 new (LocT) LocInfoType(T, DInfo); 1401 assert(LocT->getTypeClass() != T->getTypeClass() && 1402 "LocInfoType's TypeClass conflicts with an existing Type class"); 1403 return QualType(LocT, 0); 1404} 1405 1406void LocInfoType::getAsStringInternal(std::string &Str, 1407 const PrintingPolicy &Policy) const { 1408 assert(false && "LocInfoType leaked into the type system; an opaque TypeTy*" 1409 " was used directly instead of getting the QualType through" 1410 " GetTypeFromParser"); 1411} 1412 1413/// ObjCGetTypeForMethodDefinition - Builds the type for a method definition 1414/// declarator 1415QualType Sema::ObjCGetTypeForMethodDefinition(DeclPtrTy D) { 1416 ObjCMethodDecl *MDecl = cast<ObjCMethodDecl>(D.getAs<Decl>()); 1417 QualType T = MDecl->getResultType(); 1418 llvm::SmallVector<QualType, 16> ArgTys; 1419 1420 // Add the first two invisible argument types for self and _cmd. 1421 if (MDecl->isInstanceMethod()) { 1422 QualType selfTy = Context.getObjCInterfaceType(MDecl->getClassInterface()); 1423 selfTy = Context.getPointerType(selfTy); 1424 ArgTys.push_back(selfTy); 1425 } else 1426 ArgTys.push_back(Context.getObjCIdType()); 1427 ArgTys.push_back(Context.getObjCSelType()); 1428 1429 for (ObjCMethodDecl::param_iterator PI = MDecl->param_begin(), 1430 E = MDecl->param_end(); PI != E; ++PI) { 1431 QualType ArgTy = (*PI)->getType(); 1432 assert(!ArgTy.isNull() && "Couldn't parse type?"); 1433 ArgTy = adjustParameterType(ArgTy); 1434 ArgTys.push_back(ArgTy); 1435 } 1436 T = Context.getFunctionType(T, &ArgTys[0], ArgTys.size(), 1437 MDecl->isVariadic(), 0); 1438 return T; 1439} 1440 1441/// UnwrapSimilarPointerTypes - If T1 and T2 are pointer types that 1442/// may be similar (C++ 4.4), replaces T1 and T2 with the type that 1443/// they point to and return true. If T1 and T2 aren't pointer types 1444/// or pointer-to-member types, or if they are not similar at this 1445/// level, returns false and leaves T1 and T2 unchanged. Top-level 1446/// qualifiers on T1 and T2 are ignored. This function will typically 1447/// be called in a loop that successively "unwraps" pointer and 1448/// pointer-to-member types to compare them at each level. 1449bool Sema::UnwrapSimilarPointerTypes(QualType& T1, QualType& T2) { 1450 const PointerType *T1PtrType = T1->getAs<PointerType>(), 1451 *T2PtrType = T2->getAs<PointerType>(); 1452 if (T1PtrType && T2PtrType) { 1453 T1 = T1PtrType->getPointeeType(); 1454 T2 = T2PtrType->getPointeeType(); 1455 return true; 1456 } 1457 1458 const MemberPointerType *T1MPType = T1->getAs<MemberPointerType>(), 1459 *T2MPType = T2->getAs<MemberPointerType>(); 1460 if (T1MPType && T2MPType && 1461 Context.getCanonicalType(T1MPType->getClass()) == 1462 Context.getCanonicalType(T2MPType->getClass())) { 1463 T1 = T1MPType->getPointeeType(); 1464 T2 = T2MPType->getPointeeType(); 1465 return true; 1466 } 1467 return false; 1468} 1469 1470Sema::TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 1471 // C99 6.7.6: Type names have no identifier. This is already validated by 1472 // the parser. 1473 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 1474 1475 DeclaratorInfo *DInfo = 0; 1476 TagDecl *OwnedTag = 0; 1477 QualType T = GetTypeForDeclarator(D, S, &DInfo, /*Skip=*/0, &OwnedTag); 1478 if (D.isInvalidType()) 1479 return true; 1480 1481 if (getLangOptions().CPlusPlus) { 1482 // Check that there are no default arguments (C++ only). 1483 CheckExtraCXXDefaultArguments(D); 1484 1485 // C++0x [dcl.type]p3: 1486 // A type-specifier-seq shall not define a class or enumeration 1487 // unless it appears in the type-id of an alias-declaration 1488 // (7.1.3). 1489 if (OwnedTag && OwnedTag->isDefinition()) 1490 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_type_specifier) 1491 << Context.getTypeDeclType(OwnedTag); 1492 } 1493 1494 if (DInfo) 1495 T = CreateLocInfoType(T, DInfo); 1496 1497 return T.getAsOpaquePtr(); 1498} 1499 1500 1501 1502//===----------------------------------------------------------------------===// 1503// Type Attribute Processing 1504//===----------------------------------------------------------------------===// 1505 1506/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 1507/// specified type. The attribute contains 1 argument, the id of the address 1508/// space for the type. 1509static void HandleAddressSpaceTypeAttribute(QualType &Type, 1510 const AttributeList &Attr, Sema &S){ 1511 1512 // If this type is already address space qualified, reject it. 1513 // Clause 6.7.3 - Type qualifiers: "No type shall be qualified by qualifiers 1514 // for two or more different address spaces." 1515 if (Type.getAddressSpace()) { 1516 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 1517 return; 1518 } 1519 1520 // Check the attribute arguments. 1521 if (Attr.getNumArgs() != 1) { 1522 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1523 return; 1524 } 1525 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 1526 llvm::APSInt addrSpace(32); 1527 if (!ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 1528 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 1529 << ASArgExpr->getSourceRange(); 1530 return; 1531 } 1532 1533 // Bounds checking. 1534 if (addrSpace.isSigned()) { 1535 if (addrSpace.isNegative()) { 1536 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative) 1537 << ASArgExpr->getSourceRange(); 1538 return; 1539 } 1540 addrSpace.setIsSigned(false); 1541 } 1542 llvm::APSInt max(addrSpace.getBitWidth()); 1543 max = Qualifiers::MaxAddressSpace; 1544 if (addrSpace > max) { 1545 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high) 1546 << Qualifiers::MaxAddressSpace << ASArgExpr->getSourceRange(); 1547 return; 1548 } 1549 1550 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 1551 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 1552} 1553 1554/// HandleObjCGCTypeAttribute - Process an objc's gc attribute on the 1555/// specified type. The attribute contains 1 argument, weak or strong. 1556static void HandleObjCGCTypeAttribute(QualType &Type, 1557 const AttributeList &Attr, Sema &S) { 1558 if (Type.getObjCGCAttr() != Qualifiers::GCNone) { 1559 S.Diag(Attr.getLoc(), diag::err_attribute_multiple_objc_gc); 1560 return; 1561 } 1562 1563 // Check the attribute arguments. 1564 if (!Attr.getParameterName()) { 1565 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) 1566 << "objc_gc" << 1; 1567 return; 1568 } 1569 Qualifiers::GC GCAttr; 1570 if (Attr.getNumArgs() != 0) { 1571 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1572 return; 1573 } 1574 if (Attr.getParameterName()->isStr("weak")) 1575 GCAttr = Qualifiers::Weak; 1576 else if (Attr.getParameterName()->isStr("strong")) 1577 GCAttr = Qualifiers::Strong; 1578 else { 1579 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported) 1580 << "objc_gc" << Attr.getParameterName(); 1581 return; 1582 } 1583 1584 Type = S.Context.getObjCGCQualType(Type, GCAttr); 1585} 1586 1587/// HandleNoReturnTypeAttribute - Process the noreturn attribute on the 1588/// specified type. The attribute contains 0 arguments. 1589static void HandleNoReturnTypeAttribute(QualType &Type, 1590 const AttributeList &Attr, Sema &S) { 1591 if (Attr.getNumArgs() != 0) 1592 return; 1593 1594 // We only apply this to a pointer to function or a pointer to block. 1595 if (!Type->isFunctionPointerType() 1596 && !Type->isBlockPointerType() 1597 && !Type->isFunctionType()) 1598 return; 1599 1600 Type = S.Context.getNoReturnType(Type); 1601} 1602 1603void Sema::ProcessTypeAttributeList(QualType &Result, const AttributeList *AL) { 1604 // Scan through and apply attributes to this type where it makes sense. Some 1605 // attributes (such as __address_space__, __vector_size__, etc) apply to the 1606 // type, but others can be present in the type specifiers even though they 1607 // apply to the decl. Here we apply type attributes and ignore the rest. 1608 for (; AL; AL = AL->getNext()) { 1609 // If this is an attribute we can handle, do so now, otherwise, add it to 1610 // the LeftOverAttrs list for rechaining. 1611 switch (AL->getKind()) { 1612 default: break; 1613 case AttributeList::AT_address_space: 1614 HandleAddressSpaceTypeAttribute(Result, *AL, *this); 1615 break; 1616 case AttributeList::AT_objc_gc: 1617 HandleObjCGCTypeAttribute(Result, *AL, *this); 1618 break; 1619 case AttributeList::AT_noreturn: 1620 HandleNoReturnTypeAttribute(Result, *AL, *this); 1621 break; 1622 } 1623 } 1624} 1625 1626/// @brief Ensure that the type T is a complete type. 1627/// 1628/// This routine checks whether the type @p T is complete in any 1629/// context where a complete type is required. If @p T is a complete 1630/// type, returns false. If @p T is a class template specialization, 1631/// this routine then attempts to perform class template 1632/// instantiation. If instantiation fails, or if @p T is incomplete 1633/// and cannot be completed, issues the diagnostic @p diag (giving it 1634/// the type @p T) and returns true. 1635/// 1636/// @param Loc The location in the source that the incomplete type 1637/// diagnostic should refer to. 1638/// 1639/// @param T The type that this routine is examining for completeness. 1640/// 1641/// @param PD The partial diagnostic that will be printed out if T is not a 1642/// complete type. 1643/// 1644/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 1645/// @c false otherwise. 1646bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 1647 const PartialDiagnostic &PD, 1648 std::pair<SourceLocation, 1649 PartialDiagnostic> Note) { 1650 unsigned diag = PD.getDiagID(); 1651 1652 // FIXME: Add this assertion to make sure we always get instantiation points. 1653 // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType"); 1654 // FIXME: Add this assertion to help us flush out problems with 1655 // checking for dependent types and type-dependent expressions. 1656 // 1657 // assert(!T->isDependentType() && 1658 // "Can't ask whether a dependent type is complete"); 1659 1660 // If we have a complete type, we're done. 1661 if (!T->isIncompleteType()) 1662 return false; 1663 1664 // If we have a class template specialization or a class member of a 1665 // class template specialization, try to instantiate it. 1666 if (const RecordType *Record = T->getAs<RecordType>()) { 1667 if (ClassTemplateSpecializationDecl *ClassTemplateSpec 1668 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { 1669 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) { 1670 if (Loc.isValid()) 1671 ClassTemplateSpec->setPointOfInstantiation(Loc); 1672 return InstantiateClassTemplateSpecialization(ClassTemplateSpec, 1673 TSK_ImplicitInstantiation, 1674 /*Complain=*/diag != 0); 1675 } 1676 } else if (CXXRecordDecl *Rec 1677 = dyn_cast<CXXRecordDecl>(Record->getDecl())) { 1678 if (CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass()) { 1679 MemberSpecializationInfo *MSInfo = Rec->getMemberSpecializationInfo(); 1680 assert(MSInfo && "Missing member specialization information?"); 1681 // This record was instantiated from a class within a template. 1682 if (MSInfo->getTemplateSpecializationKind() 1683 != TSK_ExplicitSpecialization) { 1684 MSInfo->setPointOfInstantiation(Loc); 1685 return InstantiateClass(Loc, Rec, Pattern, 1686 getTemplateInstantiationArgs(Rec), 1687 TSK_ImplicitInstantiation, 1688 /*Complain=*/diag != 0); 1689 } 1690 } 1691 } 1692 } 1693 1694 if (diag == 0) 1695 return true; 1696 1697 // We have an incomplete type. Produce a diagnostic. 1698 Diag(Loc, PD) << T; 1699 1700 // If we have a note, produce it. 1701 if (!Note.first.isInvalid()) 1702 Diag(Note.first, Note.second); 1703 1704 // If the type was a forward declaration of a class/struct/union 1705 // type, produce 1706 const TagType *Tag = 0; 1707 if (const RecordType *Record = T->getAs<RecordType>()) 1708 Tag = Record; 1709 else if (const EnumType *Enum = T->getAs<EnumType>()) 1710 Tag = Enum; 1711 1712 if (Tag && !Tag->getDecl()->isInvalidDecl()) 1713 Diag(Tag->getDecl()->getLocation(), 1714 Tag->isBeingDefined() ? diag::note_type_being_defined 1715 : diag::note_forward_declaration) 1716 << QualType(Tag, 0); 1717 1718 return true; 1719} 1720 1721/// \brief Retrieve a version of the type 'T' that is qualified by the 1722/// nested-name-specifier contained in SS. 1723QualType Sema::getQualifiedNameType(const CXXScopeSpec &SS, QualType T) { 1724 if (!SS.isSet() || SS.isInvalid() || T.isNull()) 1725 return T; 1726 1727 NestedNameSpecifier *NNS 1728 = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 1729 return Context.getQualifiedNameType(NNS, T); 1730} 1731 1732QualType Sema::BuildTypeofExprType(Expr *E) { 1733 return Context.getTypeOfExprType(E); 1734} 1735 1736QualType Sema::BuildDecltypeType(Expr *E) { 1737 if (E->getType() == Context.OverloadTy) { 1738 Diag(E->getLocStart(), 1739 diag::err_cannot_determine_declared_type_of_overloaded_function); 1740 return QualType(); 1741 } 1742 return Context.getDecltypeType(E); 1743} 1744