SemaType.cpp revision 44ba7da5fd53d0ab01f5b9180a31e7cbfd4c27cc
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" 25#include "llvm/Support/ErrorHandling.h" 26using namespace clang; 27 28/// \brief Perform adjustment on the parameter type of a function. 29/// 30/// This routine adjusts the given parameter type @p T to the actual 31/// parameter type used by semantic analysis (C99 6.7.5.3p[7,8], 32/// C++ [dcl.fct]p3). The adjusted parameter type is returned. 33QualType Sema::adjustParameterType(QualType T) { 34 // C99 6.7.5.3p7: 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 if (T->isArrayType()) 40 return Context.getArrayDecayedType(T); 41 42 // C99 6.7.5.3p8: 43 // A declaration of a parameter as "function returning type" 44 // shall be adjusted to "pointer to function returning type", as 45 // in 6.3.2.1. 46 if (T->isFunctionType()) 47 return Context.getPointerType(T); 48 49 return T; 50} 51 52 53 54/// isOmittedBlockReturnType - Return true if this declarator is missing a 55/// return type because this is a omitted return type on a block literal. 56static bool isOmittedBlockReturnType(const Declarator &D) { 57 if (D.getContext() != Declarator::BlockLiteralContext || 58 D.getDeclSpec().hasTypeSpecifier()) 59 return false; 60 61 if (D.getNumTypeObjects() == 0) 62 return true; // ^{ ... } 63 64 if (D.getNumTypeObjects() == 1 && 65 D.getTypeObject(0).Kind == DeclaratorChunk::Function) 66 return true; // ^(int X, float Y) { ... } 67 68 return false; 69} 70 71/// \brief Convert the specified declspec to the appropriate type 72/// object. 73/// \param D the declarator containing the declaration specifier. 74/// \returns The type described by the declaration specifiers. This function 75/// never returns null. 76static QualType ConvertDeclSpecToType(Declarator &TheDeclarator, 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)) { 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 TypeDecl *D 233 = dyn_cast_or_null<TypeDecl>(static_cast<Decl *>(DS.getTypeRep())); 234 if (!D) { 235 // This can happen in C++ with ambiguous lookups. 236 Result = Context.IntTy; 237 TheDeclarator.setInvalidType(true); 238 break; 239 } 240 241 // If the type is deprecated or unavailable, diagnose it. 242 TheSema.DiagnoseUseOfDecl(D, DS.getTypeSpecTypeLoc()); 243 244 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 245 DS.getTypeSpecSign() == 0 && "No qualifiers on tag names!"); 246 247 // TypeQuals handled by caller. 248 Result = Context.getTypeDeclType(D); 249 250 // In C++, make an ElaboratedType. 251 if (TheSema.getLangOptions().CPlusPlus) { 252 TagDecl::TagKind Tag 253 = TagDecl::getTagKindForTypeSpec(DS.getTypeSpecType()); 254 Result = Context.getElaboratedType(Result, Tag); 255 } 256 257 if (D->isInvalidDecl()) 258 TheDeclarator.setInvalidType(true); 259 break; 260 } 261 case DeclSpec::TST_typename: { 262 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 263 DS.getTypeSpecSign() == 0 && 264 "Can't handle qualifiers on typedef names yet!"); 265 Result = TheSema.GetTypeFromParser(DS.getTypeRep()); 266 267 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 268 if (const ObjCInterfaceType * 269 Interface = Result->getAs<ObjCInterfaceType>()) { 270 // It would be nice if protocol qualifiers were only stored with the 271 // ObjCObjectPointerType. Unfortunately, this isn't possible due 272 // to the following typedef idiom (which is uncommon, but allowed): 273 // 274 // typedef Foo<P> T; 275 // static void func() { 276 // Foo<P> *yy; 277 // T *zz; 278 // } 279 Result = Context.getObjCInterfaceType(Interface->getDecl(), 280 (ObjCProtocolDecl**)PQ, 281 DS.getNumProtocolQualifiers()); 282 } else if (Result->isObjCIdType()) 283 // id<protocol-list> 284 Result = Context.getObjCObjectPointerType(Context.ObjCBuiltinIdTy, 285 (ObjCProtocolDecl**)PQ, DS.getNumProtocolQualifiers()); 286 else if (Result->isObjCClassType()) { 287 // Class<protocol-list> 288 Result = Context.getObjCObjectPointerType(Context.ObjCBuiltinClassTy, 289 (ObjCProtocolDecl**)PQ, DS.getNumProtocolQualifiers()); 290 } else { 291 TheSema.Diag(DeclLoc, diag::err_invalid_protocol_qualifiers) 292 << DS.getSourceRange(); 293 TheDeclarator.setInvalidType(true); 294 } 295 } 296 297 // TypeQuals handled by caller. 298 break; 299 } 300 case DeclSpec::TST_typeofType: 301 // FIXME: Preserve type source info. 302 Result = TheSema.GetTypeFromParser(DS.getTypeRep()); 303 assert(!Result.isNull() && "Didn't get a type for typeof?"); 304 // TypeQuals handled by caller. 305 Result = Context.getTypeOfType(Result); 306 break; 307 case DeclSpec::TST_typeofExpr: { 308 Expr *E = static_cast<Expr *>(DS.getTypeRep()); 309 assert(E && "Didn't get an expression for typeof?"); 310 // TypeQuals handled by caller. 311 Result = TheSema.BuildTypeofExprType(E); 312 if (Result.isNull()) { 313 Result = Context.IntTy; 314 TheDeclarator.setInvalidType(true); 315 } 316 break; 317 } 318 case DeclSpec::TST_decltype: { 319 Expr *E = static_cast<Expr *>(DS.getTypeRep()); 320 assert(E && "Didn't get an expression for decltype?"); 321 // TypeQuals handled by caller. 322 Result = TheSema.BuildDecltypeType(E); 323 if (Result.isNull()) { 324 Result = Context.IntTy; 325 TheDeclarator.setInvalidType(true); 326 } 327 break; 328 } 329 case DeclSpec::TST_auto: { 330 // TypeQuals handled by caller. 331 Result = Context.UndeducedAutoTy; 332 break; 333 } 334 335 case DeclSpec::TST_error: 336 Result = Context.IntTy; 337 TheDeclarator.setInvalidType(true); 338 break; 339 } 340 341 // Handle complex types. 342 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) { 343 if (TheSema.getLangOptions().Freestanding) 344 TheSema.Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex); 345 Result = Context.getComplexType(Result); 346 } 347 348 assert(DS.getTypeSpecComplex() != DeclSpec::TSC_imaginary && 349 "FIXME: imaginary types not supported yet!"); 350 351 // See if there are any attributes on the declspec that apply to the type (as 352 // opposed to the decl). 353 if (const AttributeList *AL = DS.getAttributes()) 354 TheSema.ProcessTypeAttributeList(Result, AL); 355 356 // Apply const/volatile/restrict qualifiers to T. 357 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 358 359 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 360 // or incomplete types shall not be restrict-qualified." C++ also allows 361 // restrict-qualified references. 362 if (TypeQuals & DeclSpec::TQ_restrict) { 363 if (Result->isAnyPointerType() || Result->isReferenceType()) { 364 QualType EltTy; 365 if (Result->isObjCObjectPointerType()) 366 EltTy = Result; 367 else 368 EltTy = Result->isPointerType() ? 369 Result->getAs<PointerType>()->getPointeeType() : 370 Result->getAs<ReferenceType>()->getPointeeType(); 371 372 // If we have a pointer or reference, the pointee must have an object 373 // incomplete type. 374 if (!EltTy->isIncompleteOrObjectType()) { 375 TheSema.Diag(DS.getRestrictSpecLoc(), 376 diag::err_typecheck_invalid_restrict_invalid_pointee) 377 << EltTy << DS.getSourceRange(); 378 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 379 } 380 } else { 381 TheSema.Diag(DS.getRestrictSpecLoc(), 382 diag::err_typecheck_invalid_restrict_not_pointer) 383 << Result << DS.getSourceRange(); 384 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 385 } 386 } 387 388 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification 389 // of a function type includes any type qualifiers, the behavior is 390 // undefined." 391 if (Result->isFunctionType() && TypeQuals) { 392 // Get some location to point at, either the C or V location. 393 SourceLocation Loc; 394 if (TypeQuals & DeclSpec::TQ_const) 395 Loc = DS.getConstSpecLoc(); 396 else if (TypeQuals & DeclSpec::TQ_volatile) 397 Loc = DS.getVolatileSpecLoc(); 398 else { 399 assert((TypeQuals & DeclSpec::TQ_restrict) && 400 "Has CVR quals but not C, V, or R?"); 401 Loc = DS.getRestrictSpecLoc(); 402 } 403 TheSema.Diag(Loc, diag::warn_typecheck_function_qualifiers) 404 << Result << DS.getSourceRange(); 405 } 406 407 // C++ [dcl.ref]p1: 408 // Cv-qualified references are ill-formed except when the 409 // cv-qualifiers are introduced through the use of a typedef 410 // (7.1.3) or of a template type argument (14.3), in which 411 // case the cv-qualifiers are ignored. 412 // FIXME: Shouldn't we be checking SCS_typedef here? 413 if (DS.getTypeSpecType() == DeclSpec::TST_typename && 414 TypeQuals && Result->isReferenceType()) { 415 TypeQuals &= ~DeclSpec::TQ_const; 416 TypeQuals &= ~DeclSpec::TQ_volatile; 417 } 418 419 Qualifiers Quals = Qualifiers::fromCVRMask(TypeQuals); 420 Result = Context.getQualifiedType(Result, Quals); 421 } 422 423 return Result; 424} 425 426static std::string getPrintableNameForEntity(DeclarationName Entity) { 427 if (Entity) 428 return Entity.getAsString(); 429 430 return "type name"; 431} 432 433/// \brief Build a pointer type. 434/// 435/// \param T The type to which we'll be building a pointer. 436/// 437/// \param Quals The cvr-qualifiers to be applied to the pointer type. 438/// 439/// \param Loc The location of the entity whose type involves this 440/// pointer type or, if there is no such entity, the location of the 441/// type that will have pointer type. 442/// 443/// \param Entity The name of the entity that involves the pointer 444/// type, if known. 445/// 446/// \returns A suitable pointer type, if there are no 447/// errors. Otherwise, returns a NULL type. 448QualType Sema::BuildPointerType(QualType T, unsigned Quals, 449 SourceLocation Loc, DeclarationName Entity) { 450 if (T->isReferenceType()) { 451 // C++ 8.3.2p4: There shall be no ... pointers to references ... 452 Diag(Loc, diag::err_illegal_decl_pointer_to_reference) 453 << getPrintableNameForEntity(Entity) << T; 454 return QualType(); 455 } 456 457 Qualifiers Qs = Qualifiers::fromCVRMask(Quals); 458 459 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 460 // object or incomplete types shall not be restrict-qualified." 461 if (Qs.hasRestrict() && !T->isIncompleteOrObjectType()) { 462 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 463 << T; 464 Qs.removeRestrict(); 465 } 466 467 // Build the pointer type. 468 return Context.getQualifiedType(Context.getPointerType(T), Qs); 469} 470 471/// \brief Build a reference type. 472/// 473/// \param T The type to which we'll be building a reference. 474/// 475/// \param CVR The cvr-qualifiers to be applied to the reference type. 476/// 477/// \param Loc The location of the entity whose type involves this 478/// reference type or, if there is no such entity, the location of the 479/// type that will have reference type. 480/// 481/// \param Entity The name of the entity that involves the reference 482/// type, if known. 483/// 484/// \returns A suitable reference type, if there are no 485/// errors. Otherwise, returns a NULL type. 486QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue, 487 unsigned CVR, SourceLocation Loc, 488 DeclarationName Entity) { 489 Qualifiers Quals = Qualifiers::fromCVRMask(CVR); 490 491 bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>(); 492 493 // C++0x [dcl.typedef]p9: If a typedef TD names a type that is a 494 // reference to a type T, and attempt to create the type "lvalue 495 // reference to cv TD" creates the type "lvalue reference to T". 496 // We use the qualifiers (restrict or none) of the original reference, 497 // not the new ones. This is consistent with GCC. 498 499 // C++ [dcl.ref]p4: There shall be no references to references. 500 // 501 // According to C++ DR 106, references to references are only 502 // diagnosed when they are written directly (e.g., "int & &"), 503 // but not when they happen via a typedef: 504 // 505 // typedef int& intref; 506 // typedef intref& intref2; 507 // 508 // Parser::ParseDeclaratorInternal diagnoses the case where 509 // references are written directly; here, we handle the 510 // collapsing of references-to-references as described in C++ 511 // DR 106 and amended by C++ DR 540. 512 513 // C++ [dcl.ref]p1: 514 // A declarator that specifies the type "reference to cv void" 515 // is ill-formed. 516 if (T->isVoidType()) { 517 Diag(Loc, diag::err_reference_to_void); 518 return QualType(); 519 } 520 521 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 522 // object or incomplete types shall not be restrict-qualified." 523 if (Quals.hasRestrict() && !T->isIncompleteOrObjectType()) { 524 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 525 << T; 526 Quals.removeRestrict(); 527 } 528 529 // C++ [dcl.ref]p1: 530 // [...] Cv-qualified references are ill-formed except when the 531 // cv-qualifiers are introduced through the use of a typedef 532 // (7.1.3) or of a template type argument (14.3), in which case 533 // the cv-qualifiers are ignored. 534 // 535 // We diagnose extraneous cv-qualifiers for the non-typedef, 536 // non-template type argument case within the parser. Here, we just 537 // ignore any extraneous cv-qualifiers. 538 Quals.removeConst(); 539 Quals.removeVolatile(); 540 541 // Handle restrict on references. 542 if (LValueRef) 543 return Context.getQualifiedType( 544 Context.getLValueReferenceType(T, SpelledAsLValue), Quals); 545 return Context.getQualifiedType(Context.getRValueReferenceType(T), Quals); 546} 547 548/// \brief Build an array type. 549/// 550/// \param T The type of each element in the array. 551/// 552/// \param ASM C99 array size modifier (e.g., '*', 'static'). 553/// 554/// \param ArraySize Expression describing the size of the array. 555/// 556/// \param Quals The cvr-qualifiers to be applied to the array's 557/// element type. 558/// 559/// \param Loc The location of the entity whose type involves this 560/// array type or, if there is no such entity, the location of the 561/// type that will have array type. 562/// 563/// \param Entity The name of the entity that involves the array 564/// type, if known. 565/// 566/// \returns A suitable array type, if there are no errors. Otherwise, 567/// returns a NULL type. 568QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM, 569 Expr *ArraySize, unsigned Quals, 570 SourceRange Brackets, DeclarationName Entity) { 571 572 SourceLocation Loc = Brackets.getBegin(); 573 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 574 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 575 // Not in C++, though. There we only dislike void. 576 if (getLangOptions().CPlusPlus) { 577 if (T->isVoidType()) { 578 Diag(Loc, diag::err_illegal_decl_array_incomplete_type) << T; 579 return QualType(); 580 } 581 } else { 582 if (RequireCompleteType(Loc, T, 583 diag::err_illegal_decl_array_incomplete_type)) 584 return QualType(); 585 } 586 587 if (T->isFunctionType()) { 588 Diag(Loc, diag::err_illegal_decl_array_of_functions) 589 << getPrintableNameForEntity(Entity) << T; 590 return QualType(); 591 } 592 593 // C++ 8.3.2p4: There shall be no ... arrays of references ... 594 if (T->isReferenceType()) { 595 Diag(Loc, diag::err_illegal_decl_array_of_references) 596 << getPrintableNameForEntity(Entity) << T; 597 return QualType(); 598 } 599 600 if (Context.getCanonicalType(T) == Context.UndeducedAutoTy) { 601 Diag(Loc, diag::err_illegal_decl_array_of_auto) 602 << getPrintableNameForEntity(Entity); 603 return QualType(); 604 } 605 606 if (const RecordType *EltTy = T->getAs<RecordType>()) { 607 // If the element type is a struct or union that contains a variadic 608 // array, accept it as a GNU extension: C99 6.7.2.1p2. 609 if (EltTy->getDecl()->hasFlexibleArrayMember()) 610 Diag(Loc, diag::ext_flexible_array_in_array) << T; 611 } else if (T->isObjCInterfaceType()) { 612 Diag(Loc, diag::err_objc_array_of_interfaces) << T; 613 return QualType(); 614 } 615 616 // C99 6.7.5.2p1: The size expression shall have integer type. 617 if (ArraySize && !ArraySize->isTypeDependent() && 618 !ArraySize->getType()->isIntegerType()) { 619 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 620 << ArraySize->getType() << ArraySize->getSourceRange(); 621 ArraySize->Destroy(Context); 622 return QualType(); 623 } 624 llvm::APSInt ConstVal(32); 625 if (!ArraySize) { 626 if (ASM == ArrayType::Star) 627 T = Context.getVariableArrayType(T, 0, ASM, Quals, Brackets); 628 else 629 T = Context.getIncompleteArrayType(T, ASM, Quals); 630 } else if (ArraySize->isValueDependent()) { 631 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets); 632 } else if (!ArraySize->isIntegerConstantExpr(ConstVal, Context) || 633 (!T->isDependentType() && !T->isIncompleteType() && 634 !T->isConstantSizeType())) { 635 // Per C99, a variable array is an array with either a non-constant 636 // size or an element type that has a non-constant-size 637 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets); 638 } else { 639 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 640 // have a value greater than zero. 641 if (ConstVal.isSigned() && ConstVal.isNegative()) { 642 Diag(ArraySize->getLocStart(), 643 diag::err_typecheck_negative_array_size) 644 << ArraySize->getSourceRange(); 645 return QualType(); 646 } 647 if (ConstVal == 0) { 648 // GCC accepts zero sized static arrays. 649 Diag(ArraySize->getLocStart(), diag::ext_typecheck_zero_array_size) 650 << ArraySize->getSourceRange(); 651 } 652 T = Context.getConstantArrayType(T, ConstVal, ASM, Quals); 653 } 654 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 655 if (!getLangOptions().C99) { 656 if (ArraySize && !ArraySize->isTypeDependent() && 657 !ArraySize->isValueDependent() && 658 !ArraySize->isIntegerConstantExpr(Context)) 659 Diag(Loc, getLangOptions().CPlusPlus? diag::err_vla_cxx : diag::ext_vla); 660 else if (ASM != ArrayType::Normal || Quals != 0) 661 Diag(Loc, 662 getLangOptions().CPlusPlus? diag::err_c99_array_usage_cxx 663 : diag::ext_c99_array_usage); 664 } 665 666 return T; 667} 668 669/// \brief Build an ext-vector type. 670/// 671/// Run the required checks for the extended vector type. 672QualType Sema::BuildExtVectorType(QualType T, ExprArg ArraySize, 673 SourceLocation AttrLoc) { 674 675 Expr *Arg = (Expr *)ArraySize.get(); 676 677 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 678 // in conjunction with complex types (pointers, arrays, functions, etc.). 679 if (!T->isDependentType() && 680 !T->isIntegerType() && !T->isRealFloatingType()) { 681 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T; 682 return QualType(); 683 } 684 685 if (!Arg->isTypeDependent() && !Arg->isValueDependent()) { 686 llvm::APSInt vecSize(32); 687 if (!Arg->isIntegerConstantExpr(vecSize, Context)) { 688 Diag(AttrLoc, diag::err_attribute_argument_not_int) 689 << "ext_vector_type" << Arg->getSourceRange(); 690 return QualType(); 691 } 692 693 // unlike gcc's vector_size attribute, the size is specified as the 694 // number of elements, not the number of bytes. 695 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 696 697 if (vectorSize == 0) { 698 Diag(AttrLoc, diag::err_attribute_zero_size) 699 << Arg->getSourceRange(); 700 return QualType(); 701 } 702 703 if (!T->isDependentType()) 704 return Context.getExtVectorType(T, vectorSize); 705 } 706 707 return Context.getDependentSizedExtVectorType(T, ArraySize.takeAs<Expr>(), 708 AttrLoc); 709} 710 711/// \brief Build a function type. 712/// 713/// This routine checks the function type according to C++ rules and 714/// under the assumption that the result type and parameter types have 715/// just been instantiated from a template. It therefore duplicates 716/// some of the behavior of GetTypeForDeclarator, but in a much 717/// simpler form that is only suitable for this narrow use case. 718/// 719/// \param T The return type of the function. 720/// 721/// \param ParamTypes The parameter types of the function. This array 722/// will be modified to account for adjustments to the types of the 723/// function parameters. 724/// 725/// \param NumParamTypes The number of parameter types in ParamTypes. 726/// 727/// \param Variadic Whether this is a variadic function type. 728/// 729/// \param Quals The cvr-qualifiers to be applied to the function type. 730/// 731/// \param Loc The location of the entity whose type involves this 732/// function type or, if there is no such entity, the location of the 733/// type that will have function type. 734/// 735/// \param Entity The name of the entity that involves the function 736/// type, if known. 737/// 738/// \returns A suitable function type, if there are no 739/// errors. Otherwise, returns a NULL type. 740QualType Sema::BuildFunctionType(QualType T, 741 QualType *ParamTypes, 742 unsigned NumParamTypes, 743 bool Variadic, unsigned Quals, 744 SourceLocation Loc, DeclarationName Entity) { 745 if (T->isArrayType() || T->isFunctionType()) { 746 Diag(Loc, diag::err_func_returning_array_function) << T; 747 return QualType(); 748 } 749 750 bool Invalid = false; 751 for (unsigned Idx = 0; Idx < NumParamTypes; ++Idx) { 752 QualType ParamType = adjustParameterType(ParamTypes[Idx]); 753 if (ParamType->isVoidType()) { 754 Diag(Loc, diag::err_param_with_void_type); 755 Invalid = true; 756 } 757 758 ParamTypes[Idx] = ParamType; 759 } 760 761 if (Invalid) 762 return QualType(); 763 764 return Context.getFunctionType(T, ParamTypes, NumParamTypes, Variadic, 765 Quals); 766} 767 768/// \brief Build a member pointer type \c T Class::*. 769/// 770/// \param T the type to which the member pointer refers. 771/// \param Class the class type into which the member pointer points. 772/// \param CVR Qualifiers applied to the member pointer type 773/// \param Loc the location where this type begins 774/// \param Entity the name of the entity that will have this member pointer type 775/// 776/// \returns a member pointer type, if successful, or a NULL type if there was 777/// an error. 778QualType Sema::BuildMemberPointerType(QualType T, QualType Class, 779 unsigned CVR, SourceLocation Loc, 780 DeclarationName Entity) { 781 Qualifiers Quals = Qualifiers::fromCVRMask(CVR); 782 783 // Verify that we're not building a pointer to pointer to function with 784 // exception specification. 785 if (CheckDistantExceptionSpec(T)) { 786 Diag(Loc, diag::err_distant_exception_spec); 787 788 // FIXME: If we're doing this as part of template instantiation, 789 // we should return immediately. 790 791 // Build the type anyway, but use the canonical type so that the 792 // exception specifiers are stripped off. 793 T = Context.getCanonicalType(T); 794 } 795 796 // C++ 8.3.3p3: A pointer to member shall not pointer to ... a member 797 // with reference type, or "cv void." 798 if (T->isReferenceType()) { 799 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference) 800 << (Entity? Entity.getAsString() : "type name") << T; 801 return QualType(); 802 } 803 804 if (T->isVoidType()) { 805 Diag(Loc, diag::err_illegal_decl_mempointer_to_void) 806 << (Entity? Entity.getAsString() : "type name"); 807 return QualType(); 808 } 809 810 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 811 // object or incomplete types shall not be restrict-qualified." 812 if (Quals.hasRestrict() && !T->isIncompleteOrObjectType()) { 813 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 814 << T; 815 816 // FIXME: If we're doing this as part of template instantiation, 817 // we should return immediately. 818 Quals.removeRestrict(); 819 } 820 821 if (!Class->isDependentType() && !Class->isRecordType()) { 822 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class; 823 return QualType(); 824 } 825 826 return Context.getQualifiedType( 827 Context.getMemberPointerType(T, Class.getTypePtr()), Quals); 828} 829 830/// \brief Build a block pointer type. 831/// 832/// \param T The type to which we'll be building a block pointer. 833/// 834/// \param CVR The cvr-qualifiers to be applied to the block pointer type. 835/// 836/// \param Loc The location of the entity whose type involves this 837/// block pointer type or, if there is no such entity, the location of the 838/// type that will have block pointer type. 839/// 840/// \param Entity The name of the entity that involves the block pointer 841/// type, if known. 842/// 843/// \returns A suitable block pointer type, if there are no 844/// errors. Otherwise, returns a NULL type. 845QualType Sema::BuildBlockPointerType(QualType T, unsigned CVR, 846 SourceLocation Loc, 847 DeclarationName Entity) { 848 if (!T->isFunctionType()) { 849 Diag(Loc, diag::err_nonfunction_block_type); 850 return QualType(); 851 } 852 853 Qualifiers Quals = Qualifiers::fromCVRMask(CVR); 854 return Context.getQualifiedType(Context.getBlockPointerType(T), Quals); 855} 856 857QualType Sema::GetTypeFromParser(TypeTy *Ty, TypeSourceInfo **TInfo) { 858 QualType QT = QualType::getFromOpaquePtr(Ty); 859 if (QT.isNull()) { 860 if (TInfo) *TInfo = 0; 861 return QualType(); 862 } 863 864 TypeSourceInfo *DI = 0; 865 if (LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) { 866 QT = LIT->getType(); 867 DI = LIT->getTypeSourceInfo(); 868 } 869 870 if (TInfo) *TInfo = DI; 871 return QT; 872} 873 874/// GetTypeForDeclarator - Convert the type for the specified 875/// declarator to Type instances. 876/// 877/// If OwnedDecl is non-NULL, and this declarator's decl-specifier-seq 878/// owns the declaration of a type (e.g., the definition of a struct 879/// type), then *OwnedDecl will receive the owned declaration. 880QualType Sema::GetTypeForDeclarator(Declarator &D, Scope *S, 881 TypeSourceInfo **TInfo, 882 TagDecl **OwnedDecl) { 883 // Determine the type of the declarator. Not all forms of declarator 884 // have a type. 885 QualType T; 886 887 switch (D.getName().getKind()) { 888 case UnqualifiedId::IK_Identifier: 889 case UnqualifiedId::IK_OperatorFunctionId: 890 case UnqualifiedId::IK_LiteralOperatorId: 891 case UnqualifiedId::IK_TemplateId: 892 T = ConvertDeclSpecToType(D, *this); 893 894 if (!D.isInvalidType() && OwnedDecl && D.getDeclSpec().isTypeSpecOwned()) 895 *OwnedDecl = cast<TagDecl>((Decl *)D.getDeclSpec().getTypeRep()); 896 break; 897 898 case UnqualifiedId::IK_ConstructorName: 899 case UnqualifiedId::IK_DestructorName: 900 case UnqualifiedId::IK_ConversionFunctionId: 901 // Constructors and destructors don't have return types. Use 902 // "void" instead. Conversion operators will check their return 903 // types separately. 904 T = Context.VoidTy; 905 break; 906 } 907 908 if (T.isNull()) 909 return T; 910 911 if (T == Context.UndeducedAutoTy) { 912 int Error = -1; 913 914 switch (D.getContext()) { 915 case Declarator::KNRTypeListContext: 916 assert(0 && "K&R type lists aren't allowed in C++"); 917 break; 918 case Declarator::PrototypeContext: 919 Error = 0; // Function prototype 920 break; 921 case Declarator::MemberContext: 922 switch (cast<TagDecl>(CurContext)->getTagKind()) { 923 case TagDecl::TK_enum: assert(0 && "unhandled tag kind"); break; 924 case TagDecl::TK_struct: Error = 1; /* Struct member */ break; 925 case TagDecl::TK_union: Error = 2; /* Union member */ break; 926 case TagDecl::TK_class: Error = 3; /* Class member */ break; 927 } 928 break; 929 case Declarator::CXXCatchContext: 930 Error = 4; // Exception declaration 931 break; 932 case Declarator::TemplateParamContext: 933 Error = 5; // Template parameter 934 break; 935 case Declarator::BlockLiteralContext: 936 Error = 6; // Block literal 937 break; 938 case Declarator::FileContext: 939 case Declarator::BlockContext: 940 case Declarator::ForContext: 941 case Declarator::ConditionContext: 942 case Declarator::TypeNameContext: 943 break; 944 } 945 946 if (Error != -1) { 947 Diag(D.getDeclSpec().getTypeSpecTypeLoc(), diag::err_auto_not_allowed) 948 << Error; 949 T = Context.IntTy; 950 D.setInvalidType(true); 951 } 952 } 953 954 // The name we're declaring, if any. 955 DeclarationName Name; 956 if (D.getIdentifier()) 957 Name = D.getIdentifier(); 958 959 // Walk the DeclTypeInfo, building the recursive type as we go. 960 // DeclTypeInfos are ordered from the identifier out, which is 961 // opposite of what we want :). 962 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 963 DeclaratorChunk &DeclType = D.getTypeObject(e-i-1); 964 switch (DeclType.Kind) { 965 default: assert(0 && "Unknown decltype!"); 966 case DeclaratorChunk::BlockPointer: 967 // If blocks are disabled, emit an error. 968 if (!LangOpts.Blocks) 969 Diag(DeclType.Loc, diag::err_blocks_disable); 970 971 T = BuildBlockPointerType(T, DeclType.Cls.TypeQuals, D.getIdentifierLoc(), 972 Name); 973 break; 974 case DeclaratorChunk::Pointer: 975 // Verify that we're not building a pointer to pointer to function with 976 // exception specification. 977 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 978 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 979 D.setInvalidType(true); 980 // Build the type anyway. 981 } 982 if (getLangOptions().ObjC1 && T->isObjCInterfaceType()) { 983 const ObjCInterfaceType *OIT = T->getAs<ObjCInterfaceType>(); 984 T = Context.getObjCObjectPointerType(T, 985 (ObjCProtocolDecl **)OIT->qual_begin(), 986 OIT->getNumProtocols()); 987 break; 988 } 989 T = BuildPointerType(T, DeclType.Ptr.TypeQuals, DeclType.Loc, Name); 990 break; 991 case DeclaratorChunk::Reference: { 992 Qualifiers Quals; 993 if (DeclType.Ref.HasRestrict) Quals.addRestrict(); 994 995 // Verify that we're not building a reference to pointer to function with 996 // exception specification. 997 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 998 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 999 D.setInvalidType(true); 1000 // Build the type anyway. 1001 } 1002 T = BuildReferenceType(T, DeclType.Ref.LValueRef, Quals, 1003 DeclType.Loc, Name); 1004 break; 1005 } 1006 case DeclaratorChunk::Array: { 1007 // Verify that we're not building an array of pointers to function with 1008 // exception specification. 1009 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 1010 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 1011 D.setInvalidType(true); 1012 // Build the type anyway. 1013 } 1014 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 1015 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 1016 ArrayType::ArraySizeModifier ASM; 1017 if (ATI.isStar) 1018 ASM = ArrayType::Star; 1019 else if (ATI.hasStatic) 1020 ASM = ArrayType::Static; 1021 else 1022 ASM = ArrayType::Normal; 1023 if (ASM == ArrayType::Star && 1024 D.getContext() != Declarator::PrototypeContext) { 1025 // FIXME: This check isn't quite right: it allows star in prototypes 1026 // for function definitions, and disallows some edge cases detailed 1027 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html 1028 Diag(DeclType.Loc, diag::err_array_star_outside_prototype); 1029 ASM = ArrayType::Normal; 1030 D.setInvalidType(true); 1031 } 1032 T = BuildArrayType(T, ASM, ArraySize, 1033 Qualifiers::fromCVRMask(ATI.TypeQuals), 1034 SourceRange(DeclType.Loc, DeclType.EndLoc), Name); 1035 break; 1036 } 1037 case DeclaratorChunk::Function: { 1038 // If the function declarator has a prototype (i.e. it is not () and 1039 // does not have a K&R-style identifier list), then the arguments are part 1040 // of the type, otherwise the argument list is (). 1041 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 1042 1043 // C99 6.7.5.3p1: The return type may not be a function or array type. 1044 if (T->isArrayType() || T->isFunctionType()) { 1045 Diag(DeclType.Loc, diag::err_func_returning_array_function) << T; 1046 T = Context.IntTy; 1047 D.setInvalidType(true); 1048 } 1049 1050 if (getLangOptions().CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) { 1051 // C++ [dcl.fct]p6: 1052 // Types shall not be defined in return or parameter types. 1053 TagDecl *Tag = cast<TagDecl>((Decl *)D.getDeclSpec().getTypeRep()); 1054 if (Tag->isDefinition()) 1055 Diag(Tag->getLocation(), diag::err_type_defined_in_result_type) 1056 << Context.getTypeDeclType(Tag); 1057 } 1058 1059 // Exception specs are not allowed in typedefs. Complain, but add it 1060 // anyway. 1061 if (FTI.hasExceptionSpec && 1062 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1063 Diag(FTI.getThrowLoc(), diag::err_exception_spec_in_typedef); 1064 1065 if (FTI.NumArgs == 0) { 1066 if (getLangOptions().CPlusPlus) { 1067 // C++ 8.3.5p2: If the parameter-declaration-clause is empty, the 1068 // function takes no arguments. 1069 llvm::SmallVector<QualType, 4> Exceptions; 1070 Exceptions.reserve(FTI.NumExceptions); 1071 for (unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) { 1072 // FIXME: Preserve type source info. 1073 QualType ET = GetTypeFromParser(FTI.Exceptions[ei].Ty); 1074 // Check that the type is valid for an exception spec, and drop it 1075 // if not. 1076 if (!CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range)) 1077 Exceptions.push_back(ET); 1078 } 1079 T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic, FTI.TypeQuals, 1080 FTI.hasExceptionSpec, 1081 FTI.hasAnyExceptionSpec, 1082 Exceptions.size(), Exceptions.data()); 1083 } else if (FTI.isVariadic) { 1084 // We allow a zero-parameter variadic function in C if the 1085 // function is marked with the "overloadable" 1086 // attribute. Scan for this attribute now. 1087 bool Overloadable = false; 1088 for (const AttributeList *Attrs = D.getAttributes(); 1089 Attrs; Attrs = Attrs->getNext()) { 1090 if (Attrs->getKind() == AttributeList::AT_overloadable) { 1091 Overloadable = true; 1092 break; 1093 } 1094 } 1095 1096 if (!Overloadable) 1097 Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); 1098 T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic, 0); 1099 } else { 1100 // Simple void foo(), where the incoming T is the result type. 1101 T = Context.getFunctionNoProtoType(T); 1102 } 1103 } else if (FTI.ArgInfo[0].Param == 0) { 1104 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function definition. 1105 Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 1106 D.setInvalidType(true); 1107 } else { 1108 // Otherwise, we have a function with an argument list that is 1109 // potentially variadic. 1110 llvm::SmallVector<QualType, 16> ArgTys; 1111 1112 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 1113 ParmVarDecl *Param = 1114 cast<ParmVarDecl>(FTI.ArgInfo[i].Param.getAs<Decl>()); 1115 QualType ArgTy = Param->getType(); 1116 assert(!ArgTy.isNull() && "Couldn't parse type?"); 1117 1118 // Adjust the parameter type. 1119 assert((ArgTy == adjustParameterType(ArgTy)) && "Unadjusted type?"); 1120 1121 // Look for 'void'. void is allowed only as a single argument to a 1122 // function with no other parameters (C99 6.7.5.3p10). We record 1123 // int(void) as a FunctionProtoType with an empty argument list. 1124 if (ArgTy->isVoidType()) { 1125 // If this is something like 'float(int, void)', reject it. 'void' 1126 // is an incomplete type (C99 6.2.5p19) and function decls cannot 1127 // have arguments of incomplete type. 1128 if (FTI.NumArgs != 1 || FTI.isVariadic) { 1129 Diag(DeclType.Loc, diag::err_void_only_param); 1130 ArgTy = Context.IntTy; 1131 Param->setType(ArgTy); 1132 } else if (FTI.ArgInfo[i].Ident) { 1133 // Reject, but continue to parse 'int(void abc)'. 1134 Diag(FTI.ArgInfo[i].IdentLoc, 1135 diag::err_param_with_void_type); 1136 ArgTy = Context.IntTy; 1137 Param->setType(ArgTy); 1138 } else { 1139 // Reject, but continue to parse 'float(const void)'. 1140 if (ArgTy.hasQualifiers()) 1141 Diag(DeclType.Loc, diag::err_void_param_qualified); 1142 1143 // Do not add 'void' to the ArgTys list. 1144 break; 1145 } 1146 } else if (!FTI.hasPrototype) { 1147 if (ArgTy->isPromotableIntegerType()) { 1148 ArgTy = Context.getPromotedIntegerType(ArgTy); 1149 } else if (const BuiltinType* BTy = ArgTy->getAs<BuiltinType>()) { 1150 if (BTy->getKind() == BuiltinType::Float) 1151 ArgTy = Context.DoubleTy; 1152 } 1153 } 1154 1155 ArgTys.push_back(ArgTy); 1156 } 1157 1158 llvm::SmallVector<QualType, 4> Exceptions; 1159 Exceptions.reserve(FTI.NumExceptions); 1160 for (unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) { 1161 // FIXME: Preserve type source info. 1162 QualType ET = GetTypeFromParser(FTI.Exceptions[ei].Ty); 1163 // Check that the type is valid for an exception spec, and drop it if 1164 // not. 1165 if (!CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range)) 1166 Exceptions.push_back(ET); 1167 } 1168 1169 T = Context.getFunctionType(T, ArgTys.data(), ArgTys.size(), 1170 FTI.isVariadic, FTI.TypeQuals, 1171 FTI.hasExceptionSpec, 1172 FTI.hasAnyExceptionSpec, 1173 Exceptions.size(), Exceptions.data()); 1174 } 1175 break; 1176 } 1177 case DeclaratorChunk::MemberPointer: 1178 // Verify that we're not building a pointer to pointer to function with 1179 // exception specification. 1180 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 1181 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 1182 D.setInvalidType(true); 1183 // Build the type anyway. 1184 } 1185 // The scope spec must refer to a class, or be dependent. 1186 QualType ClsType; 1187 if (isDependentScopeSpecifier(DeclType.Mem.Scope()) 1188 || dyn_cast_or_null<CXXRecordDecl>( 1189 computeDeclContext(DeclType.Mem.Scope()))) { 1190 NestedNameSpecifier *NNS 1191 = (NestedNameSpecifier *)DeclType.Mem.Scope().getScopeRep(); 1192 NestedNameSpecifier *NNSPrefix = NNS->getPrefix(); 1193 switch (NNS->getKind()) { 1194 case NestedNameSpecifier::Identifier: 1195 ClsType = Context.getTypenameType(NNSPrefix, NNS->getAsIdentifier()); 1196 break; 1197 1198 case NestedNameSpecifier::Namespace: 1199 case NestedNameSpecifier::Global: 1200 llvm_unreachable("Nested-name-specifier must name a type"); 1201 break; 1202 1203 case NestedNameSpecifier::TypeSpec: 1204 case NestedNameSpecifier::TypeSpecWithTemplate: 1205 ClsType = QualType(NNS->getAsType(), 0); 1206 if (NNSPrefix) 1207 ClsType = Context.getQualifiedNameType(NNSPrefix, ClsType); 1208 break; 1209 } 1210 } else { 1211 Diag(DeclType.Mem.Scope().getBeginLoc(), 1212 diag::err_illegal_decl_mempointer_in_nonclass) 1213 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 1214 << DeclType.Mem.Scope().getRange(); 1215 D.setInvalidType(true); 1216 } 1217 1218 if (!ClsType.isNull()) 1219 T = BuildMemberPointerType(T, ClsType, DeclType.Mem.TypeQuals, 1220 DeclType.Loc, D.getIdentifier()); 1221 if (T.isNull()) { 1222 T = Context.IntTy; 1223 D.setInvalidType(true); 1224 } 1225 break; 1226 } 1227 1228 if (T.isNull()) { 1229 D.setInvalidType(true); 1230 T = Context.IntTy; 1231 } 1232 1233 // See if there are any attributes on this declarator chunk. 1234 if (const AttributeList *AL = DeclType.getAttrs()) 1235 ProcessTypeAttributeList(T, AL); 1236 } 1237 1238 if (getLangOptions().CPlusPlus && T->isFunctionType()) { 1239 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>(); 1240 assert(FnTy && "Why oh why is there not a FunctionProtoType here?"); 1241 1242 // C++ 8.3.5p4: A cv-qualifier-seq shall only be part of the function type 1243 // for a nonstatic member function, the function type to which a pointer 1244 // to member refers, or the top-level function type of a function typedef 1245 // declaration. 1246 if (FnTy->getTypeQuals() != 0 && 1247 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 1248 ((D.getContext() != Declarator::MemberContext && 1249 (!D.getCXXScopeSpec().isSet() || 1250 !computeDeclContext(D.getCXXScopeSpec(), /*FIXME:*/true) 1251 ->isRecord())) || 1252 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static)) { 1253 if (D.isFunctionDeclarator()) 1254 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_function_type); 1255 else 1256 Diag(D.getIdentifierLoc(), 1257 diag::err_invalid_qualified_typedef_function_type_use); 1258 1259 // Strip the cv-quals from the type. 1260 T = Context.getFunctionType(FnTy->getResultType(), FnTy->arg_type_begin(), 1261 FnTy->getNumArgs(), FnTy->isVariadic(), 0); 1262 } 1263 } 1264 1265 // If there were any type attributes applied to the decl itself (not the 1266 // type, apply the type attribute to the type!) 1267 if (const AttributeList *Attrs = D.getAttributes()) 1268 ProcessTypeAttributeList(T, Attrs); 1269 1270 if (TInfo) { 1271 if (D.isInvalidType()) 1272 *TInfo = 0; 1273 else 1274 *TInfo = GetTypeSourceInfoForDeclarator(D, T); 1275 } 1276 1277 return T; 1278} 1279 1280namespace { 1281 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> { 1282 const DeclSpec &DS; 1283 1284 public: 1285 TypeSpecLocFiller(const DeclSpec &DS) : DS(DS) {} 1286 1287 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 1288 Visit(TL.getUnqualifiedLoc()); 1289 } 1290 void VisitTypedefTypeLoc(TypedefTypeLoc TL) { 1291 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 1292 } 1293 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) { 1294 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 1295 1296 if (DS.getProtocolQualifiers()) { 1297 assert(TL.getNumProtocols() > 0); 1298 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 1299 TL.setLAngleLoc(DS.getProtocolLAngleLoc()); 1300 TL.setRAngleLoc(DS.getSourceRange().getEnd()); 1301 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i) 1302 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]); 1303 } else { 1304 assert(TL.getNumProtocols() == 0); 1305 TL.setLAngleLoc(SourceLocation()); 1306 TL.setRAngleLoc(SourceLocation()); 1307 } 1308 } 1309 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 1310 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 1311 1312 TL.setStarLoc(SourceLocation()); 1313 1314 if (DS.getProtocolQualifiers()) { 1315 assert(TL.getNumProtocols() > 0); 1316 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 1317 TL.setHasProtocolsAsWritten(true); 1318 TL.setLAngleLoc(DS.getProtocolLAngleLoc()); 1319 TL.setRAngleLoc(DS.getSourceRange().getEnd()); 1320 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i) 1321 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]); 1322 1323 } else { 1324 assert(TL.getNumProtocols() == 0); 1325 TL.setHasProtocolsAsWritten(false); 1326 TL.setLAngleLoc(SourceLocation()); 1327 TL.setRAngleLoc(SourceLocation()); 1328 } 1329 1330 // This might not have been written with an inner type. 1331 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) { 1332 TL.setHasBaseTypeAsWritten(false); 1333 TL.getBaseTypeLoc().initialize(SourceLocation()); 1334 } else { 1335 TL.setHasBaseTypeAsWritten(true); 1336 Visit(TL.getBaseTypeLoc()); 1337 } 1338 } 1339 void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) { 1340 TypeSourceInfo *TInfo = 0; 1341 Sema::GetTypeFromParser(DS.getTypeRep(), &TInfo); 1342 1343 // If we got no declarator info from previous Sema routines, 1344 // just fill with the typespec loc. 1345 if (!TInfo) { 1346 TL.initialize(DS.getTypeSpecTypeLoc()); 1347 return; 1348 } 1349 1350 TemplateSpecializationTypeLoc OldTL = 1351 cast<TemplateSpecializationTypeLoc>(TInfo->getTypeLoc()); 1352 TL.copy(OldTL); 1353 } 1354 void VisitTypeLoc(TypeLoc TL) { 1355 // FIXME: add other typespec types and change this to an assert. 1356 TL.initialize(DS.getTypeSpecTypeLoc()); 1357 } 1358 }; 1359 1360 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> { 1361 const DeclaratorChunk &Chunk; 1362 1363 public: 1364 DeclaratorLocFiller(const DeclaratorChunk &Chunk) : Chunk(Chunk) {} 1365 1366 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 1367 llvm_unreachable("qualified type locs not expected here!"); 1368 } 1369 1370 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) { 1371 assert(Chunk.Kind == DeclaratorChunk::BlockPointer); 1372 TL.setCaretLoc(Chunk.Loc); 1373 } 1374 void VisitPointerTypeLoc(PointerTypeLoc TL) { 1375 assert(Chunk.Kind == DeclaratorChunk::Pointer); 1376 TL.setStarLoc(Chunk.Loc); 1377 } 1378 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 1379 assert(Chunk.Kind == DeclaratorChunk::Pointer); 1380 TL.setStarLoc(Chunk.Loc); 1381 TL.setHasBaseTypeAsWritten(true); 1382 TL.setHasProtocolsAsWritten(false); 1383 TL.setLAngleLoc(SourceLocation()); 1384 TL.setRAngleLoc(SourceLocation()); 1385 } 1386 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) { 1387 assert(Chunk.Kind == DeclaratorChunk::MemberPointer); 1388 TL.setStarLoc(Chunk.Loc); 1389 // FIXME: nested name specifier 1390 } 1391 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) { 1392 assert(Chunk.Kind == DeclaratorChunk::Reference); 1393 // 'Amp' is misleading: this might have been originally 1394 /// spelled with AmpAmp. 1395 TL.setAmpLoc(Chunk.Loc); 1396 } 1397 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) { 1398 assert(Chunk.Kind == DeclaratorChunk::Reference); 1399 assert(!Chunk.Ref.LValueRef); 1400 TL.setAmpAmpLoc(Chunk.Loc); 1401 } 1402 void VisitArrayTypeLoc(ArrayTypeLoc TL) { 1403 assert(Chunk.Kind == DeclaratorChunk::Array); 1404 TL.setLBracketLoc(Chunk.Loc); 1405 TL.setRBracketLoc(Chunk.EndLoc); 1406 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts)); 1407 } 1408 void VisitFunctionTypeLoc(FunctionTypeLoc TL) { 1409 assert(Chunk.Kind == DeclaratorChunk::Function); 1410 TL.setLParenLoc(Chunk.Loc); 1411 TL.setRParenLoc(Chunk.EndLoc); 1412 1413 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun; 1414 for (unsigned i = 0, e = TL.getNumArgs(), tpi = 0; i != e; ++i) { 1415 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 1416 TL.setArg(tpi++, Param); 1417 } 1418 // FIXME: exception specs 1419 } 1420 1421 void VisitTypeLoc(TypeLoc TL) { 1422 llvm_unreachable("unsupported TypeLoc kind in declarator!"); 1423 } 1424 }; 1425} 1426 1427/// \brief Create and instantiate a TypeSourceInfo with type source information. 1428/// 1429/// \param T QualType referring to the type as written in source code. 1430TypeSourceInfo * 1431Sema::GetTypeSourceInfoForDeclarator(Declarator &D, QualType T) { 1432 TypeSourceInfo *TInfo = Context.CreateTypeSourceInfo(T); 1433 UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc(); 1434 1435 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 1436 DeclaratorLocFiller(D.getTypeObject(i)).Visit(CurrTL); 1437 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 1438 } 1439 1440 TypeSpecLocFiller(D.getDeclSpec()).Visit(CurrTL); 1441 1442 return TInfo; 1443} 1444 1445/// \brief Create a LocInfoType to hold the given QualType and TypeSourceInfo. 1446QualType Sema::CreateLocInfoType(QualType T, TypeSourceInfo *TInfo) { 1447 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser 1448 // and Sema during declaration parsing. Try deallocating/caching them when 1449 // it's appropriate, instead of allocating them and keeping them around. 1450 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType), 8); 1451 new (LocT) LocInfoType(T, TInfo); 1452 assert(LocT->getTypeClass() != T->getTypeClass() && 1453 "LocInfoType's TypeClass conflicts with an existing Type class"); 1454 return QualType(LocT, 0); 1455} 1456 1457void LocInfoType::getAsStringInternal(std::string &Str, 1458 const PrintingPolicy &Policy) const { 1459 assert(false && "LocInfoType leaked into the type system; an opaque TypeTy*" 1460 " was used directly instead of getting the QualType through" 1461 " GetTypeFromParser"); 1462} 1463 1464/// UnwrapSimilarPointerTypes - If T1 and T2 are pointer types that 1465/// may be similar (C++ 4.4), replaces T1 and T2 with the type that 1466/// they point to and return true. If T1 and T2 aren't pointer types 1467/// or pointer-to-member types, or if they are not similar at this 1468/// level, returns false and leaves T1 and T2 unchanged. Top-level 1469/// qualifiers on T1 and T2 are ignored. This function will typically 1470/// be called in a loop that successively "unwraps" pointer and 1471/// pointer-to-member types to compare them at each level. 1472bool Sema::UnwrapSimilarPointerTypes(QualType& T1, QualType& T2) { 1473 const PointerType *T1PtrType = T1->getAs<PointerType>(), 1474 *T2PtrType = T2->getAs<PointerType>(); 1475 if (T1PtrType && T2PtrType) { 1476 T1 = T1PtrType->getPointeeType(); 1477 T2 = T2PtrType->getPointeeType(); 1478 return true; 1479 } 1480 1481 const MemberPointerType *T1MPType = T1->getAs<MemberPointerType>(), 1482 *T2MPType = T2->getAs<MemberPointerType>(); 1483 if (T1MPType && T2MPType && 1484 Context.getCanonicalType(T1MPType->getClass()) == 1485 Context.getCanonicalType(T2MPType->getClass())) { 1486 T1 = T1MPType->getPointeeType(); 1487 T2 = T2MPType->getPointeeType(); 1488 return true; 1489 } 1490 return false; 1491} 1492 1493Sema::TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 1494 // C99 6.7.6: Type names have no identifier. This is already validated by 1495 // the parser. 1496 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 1497 1498 TypeSourceInfo *TInfo = 0; 1499 TagDecl *OwnedTag = 0; 1500 QualType T = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 1501 if (D.isInvalidType()) 1502 return true; 1503 1504 if (getLangOptions().CPlusPlus) { 1505 // Check that there are no default arguments (C++ only). 1506 CheckExtraCXXDefaultArguments(D); 1507 1508 // C++0x [dcl.type]p3: 1509 // A type-specifier-seq shall not define a class or enumeration 1510 // unless it appears in the type-id of an alias-declaration 1511 // (7.1.3). 1512 if (OwnedTag && OwnedTag->isDefinition()) 1513 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_type_specifier) 1514 << Context.getTypeDeclType(OwnedTag); 1515 } 1516 1517 if (TInfo) 1518 T = CreateLocInfoType(T, TInfo); 1519 1520 return T.getAsOpaquePtr(); 1521} 1522 1523 1524 1525//===----------------------------------------------------------------------===// 1526// Type Attribute Processing 1527//===----------------------------------------------------------------------===// 1528 1529/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 1530/// specified type. The attribute contains 1 argument, the id of the address 1531/// space for the type. 1532static void HandleAddressSpaceTypeAttribute(QualType &Type, 1533 const AttributeList &Attr, Sema &S){ 1534 1535 // If this type is already address space qualified, reject it. 1536 // Clause 6.7.3 - Type qualifiers: "No type shall be qualified by qualifiers 1537 // for two or more different address spaces." 1538 if (Type.getAddressSpace()) { 1539 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 1540 return; 1541 } 1542 1543 // Check the attribute arguments. 1544 if (Attr.getNumArgs() != 1) { 1545 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1546 return; 1547 } 1548 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 1549 llvm::APSInt addrSpace(32); 1550 if (!ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 1551 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 1552 << ASArgExpr->getSourceRange(); 1553 return; 1554 } 1555 1556 // Bounds checking. 1557 if (addrSpace.isSigned()) { 1558 if (addrSpace.isNegative()) { 1559 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative) 1560 << ASArgExpr->getSourceRange(); 1561 return; 1562 } 1563 addrSpace.setIsSigned(false); 1564 } 1565 llvm::APSInt max(addrSpace.getBitWidth()); 1566 max = Qualifiers::MaxAddressSpace; 1567 if (addrSpace > max) { 1568 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high) 1569 << Qualifiers::MaxAddressSpace << ASArgExpr->getSourceRange(); 1570 return; 1571 } 1572 1573 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 1574 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 1575} 1576 1577/// HandleObjCGCTypeAttribute - Process an objc's gc attribute on the 1578/// specified type. The attribute contains 1 argument, weak or strong. 1579static void HandleObjCGCTypeAttribute(QualType &Type, 1580 const AttributeList &Attr, Sema &S) { 1581 if (Type.getObjCGCAttr() != Qualifiers::GCNone) { 1582 S.Diag(Attr.getLoc(), diag::err_attribute_multiple_objc_gc); 1583 return; 1584 } 1585 1586 // Check the attribute arguments. 1587 if (!Attr.getParameterName()) { 1588 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) 1589 << "objc_gc" << 1; 1590 return; 1591 } 1592 Qualifiers::GC GCAttr; 1593 if (Attr.getNumArgs() != 0) { 1594 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1595 return; 1596 } 1597 if (Attr.getParameterName()->isStr("weak")) 1598 GCAttr = Qualifiers::Weak; 1599 else if (Attr.getParameterName()->isStr("strong")) 1600 GCAttr = Qualifiers::Strong; 1601 else { 1602 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported) 1603 << "objc_gc" << Attr.getParameterName(); 1604 return; 1605 } 1606 1607 Type = S.Context.getObjCGCQualType(Type, GCAttr); 1608} 1609 1610/// HandleNoReturnTypeAttribute - Process the noreturn attribute on the 1611/// specified type. The attribute contains 0 arguments. 1612static void HandleNoReturnTypeAttribute(QualType &Type, 1613 const AttributeList &Attr, Sema &S) { 1614 if (Attr.getNumArgs() != 0) 1615 return; 1616 1617 // We only apply this to a pointer to function or a pointer to block. 1618 if (!Type->isFunctionPointerType() 1619 && !Type->isBlockPointerType() 1620 && !Type->isFunctionType()) 1621 return; 1622 1623 Type = S.Context.getNoReturnType(Type); 1624} 1625 1626/// HandleVectorSizeAttribute - this attribute is only applicable to integral 1627/// and float scalars, although arrays, pointers, and function return values are 1628/// allowed in conjunction with this construct. Aggregates with this attribute 1629/// are invalid, even if they are of the same size as a corresponding scalar. 1630/// The raw attribute should contain precisely 1 argument, the vector size for 1631/// the variable, measured in bytes. If curType and rawAttr are well formed, 1632/// this routine will return a new vector type. 1633static void HandleVectorSizeAttr(QualType& CurType, const AttributeList &Attr, Sema &S) { 1634 // Check the attribute arugments. 1635 if (Attr.getNumArgs() != 1) { 1636 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1637 return; 1638 } 1639 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 1640 llvm::APSInt vecSize(32); 1641 if (!sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) { 1642 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 1643 << "vector_size" << sizeExpr->getSourceRange(); 1644 return; 1645 } 1646 // the base type must be integer or float, and can't already be a vector. 1647 if (CurType->isVectorType() || 1648 (!CurType->isIntegerType() && !CurType->isRealFloatingType())) { 1649 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType; 1650 return; 1651 } 1652 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 1653 // vecSize is specified in bytes - convert to bits. 1654 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8); 1655 1656 // the vector size needs to be an integral multiple of the type size. 1657 if (vectorSize % typeSize) { 1658 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 1659 << sizeExpr->getSourceRange(); 1660 return; 1661 } 1662 if (vectorSize == 0) { 1663 S.Diag(Attr.getLoc(), diag::err_attribute_zero_size) 1664 << sizeExpr->getSourceRange(); 1665 return; 1666 } 1667 1668 // Success! Instantiate the vector type, the number of elements is > 0, and 1669 // not required to be a power of 2, unlike GCC. 1670 CurType = S.Context.getVectorType(CurType, vectorSize/typeSize); 1671} 1672 1673void Sema::ProcessTypeAttributeList(QualType &Result, const AttributeList *AL) { 1674 // Scan through and apply attributes to this type where it makes sense. Some 1675 // attributes (such as __address_space__, __vector_size__, etc) apply to the 1676 // type, but others can be present in the type specifiers even though they 1677 // apply to the decl. Here we apply type attributes and ignore the rest. 1678 for (; AL; AL = AL->getNext()) { 1679 // If this is an attribute we can handle, do so now, otherwise, add it to 1680 // the LeftOverAttrs list for rechaining. 1681 switch (AL->getKind()) { 1682 default: break; 1683 case AttributeList::AT_address_space: 1684 HandleAddressSpaceTypeAttribute(Result, *AL, *this); 1685 break; 1686 case AttributeList::AT_objc_gc: 1687 HandleObjCGCTypeAttribute(Result, *AL, *this); 1688 break; 1689 case AttributeList::AT_noreturn: 1690 HandleNoReturnTypeAttribute(Result, *AL, *this); 1691 break; 1692 case AttributeList::AT_vector_size: 1693 HandleVectorSizeAttr(Result, *AL, *this); 1694 break; 1695 } 1696 } 1697} 1698 1699/// @brief Ensure that the type T is a complete type. 1700/// 1701/// This routine checks whether the type @p T is complete in any 1702/// context where a complete type is required. If @p T is a complete 1703/// type, returns false. If @p T is a class template specialization, 1704/// this routine then attempts to perform class template 1705/// instantiation. If instantiation fails, or if @p T is incomplete 1706/// and cannot be completed, issues the diagnostic @p diag (giving it 1707/// the type @p T) and returns true. 1708/// 1709/// @param Loc The location in the source that the incomplete type 1710/// diagnostic should refer to. 1711/// 1712/// @param T The type that this routine is examining for completeness. 1713/// 1714/// @param PD The partial diagnostic that will be printed out if T is not a 1715/// complete type. 1716/// 1717/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 1718/// @c false otherwise. 1719bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 1720 const PartialDiagnostic &PD, 1721 std::pair<SourceLocation, 1722 PartialDiagnostic> Note) { 1723 unsigned diag = PD.getDiagID(); 1724 1725 // FIXME: Add this assertion to make sure we always get instantiation points. 1726 // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType"); 1727 // FIXME: Add this assertion to help us flush out problems with 1728 // checking for dependent types and type-dependent expressions. 1729 // 1730 // assert(!T->isDependentType() && 1731 // "Can't ask whether a dependent type is complete"); 1732 1733 // If we have a complete type, we're done. 1734 if (!T->isIncompleteType()) 1735 return false; 1736 1737 // If we have a class template specialization or a class member of a 1738 // class template specialization, or an array with known size of such, 1739 // try to instantiate it. 1740 QualType MaybeTemplate = T; 1741 if (const ConstantArrayType *Array = Context.getAsConstantArrayType(T)) 1742 MaybeTemplate = Array->getElementType(); 1743 if (const RecordType *Record = MaybeTemplate->getAs<RecordType>()) { 1744 if (ClassTemplateSpecializationDecl *ClassTemplateSpec 1745 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { 1746 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) 1747 return InstantiateClassTemplateSpecialization(Loc, ClassTemplateSpec, 1748 TSK_ImplicitInstantiation, 1749 /*Complain=*/diag != 0); 1750 } else if (CXXRecordDecl *Rec 1751 = dyn_cast<CXXRecordDecl>(Record->getDecl())) { 1752 if (CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass()) { 1753 MemberSpecializationInfo *MSInfo = Rec->getMemberSpecializationInfo(); 1754 assert(MSInfo && "Missing member specialization information?"); 1755 // This record was instantiated from a class within a template. 1756 if (MSInfo->getTemplateSpecializationKind() 1757 != TSK_ExplicitSpecialization) 1758 return InstantiateClass(Loc, Rec, Pattern, 1759 getTemplateInstantiationArgs(Rec), 1760 TSK_ImplicitInstantiation, 1761 /*Complain=*/diag != 0); 1762 } 1763 } 1764 } 1765 1766 if (diag == 0) 1767 return true; 1768 1769 // We have an incomplete type. Produce a diagnostic. 1770 Diag(Loc, PD) << T; 1771 1772 // If we have a note, produce it. 1773 if (!Note.first.isInvalid()) 1774 Diag(Note.first, Note.second); 1775 1776 // If the type was a forward declaration of a class/struct/union 1777 // type, produce 1778 const TagType *Tag = 0; 1779 if (const RecordType *Record = T->getAs<RecordType>()) 1780 Tag = Record; 1781 else if (const EnumType *Enum = T->getAs<EnumType>()) 1782 Tag = Enum; 1783 1784 if (Tag && !Tag->getDecl()->isInvalidDecl()) 1785 Diag(Tag->getDecl()->getLocation(), 1786 Tag->isBeingDefined() ? diag::note_type_being_defined 1787 : diag::note_forward_declaration) 1788 << QualType(Tag, 0); 1789 1790 return true; 1791} 1792 1793/// \brief Retrieve a version of the type 'T' that is qualified by the 1794/// nested-name-specifier contained in SS. 1795QualType Sema::getQualifiedNameType(const CXXScopeSpec &SS, QualType T) { 1796 if (!SS.isSet() || SS.isInvalid() || T.isNull()) 1797 return T; 1798 1799 NestedNameSpecifier *NNS 1800 = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 1801 return Context.getQualifiedNameType(NNS, T); 1802} 1803 1804QualType Sema::BuildTypeofExprType(Expr *E) { 1805 if (E->getType() == Context.OverloadTy) { 1806 // C++ [temp.arg.explicit]p3 allows us to resolve a template-id to a 1807 // function template specialization wherever deduction cannot occur. 1808 if (FunctionDecl *Specialization 1809 = ResolveSingleFunctionTemplateSpecialization(E)) { 1810 E = FixOverloadedFunctionReference(E, Specialization); 1811 if (!E) 1812 return QualType(); 1813 } else { 1814 Diag(E->getLocStart(), 1815 diag::err_cannot_determine_declared_type_of_overloaded_function) 1816 << false << E->getSourceRange(); 1817 return QualType(); 1818 } 1819 } 1820 1821 return Context.getTypeOfExprType(E); 1822} 1823 1824QualType Sema::BuildDecltypeType(Expr *E) { 1825 if (E->getType() == Context.OverloadTy) { 1826 // C++ [temp.arg.explicit]p3 allows us to resolve a template-id to a 1827 // function template specialization wherever deduction cannot occur. 1828 if (FunctionDecl *Specialization 1829 = ResolveSingleFunctionTemplateSpecialization(E)) { 1830 E = FixOverloadedFunctionReference(E, Specialization); 1831 if (!E) 1832 return QualType(); 1833 } else { 1834 Diag(E->getLocStart(), 1835 diag::err_cannot_determine_declared_type_of_overloaded_function) 1836 << true << E->getSourceRange(); 1837 return QualType(); 1838 } 1839 } 1840 1841 return Context.getDecltypeType(E); 1842} 1843