SemaType.cpp revision af40776922bc5c28e740adb0342faa09f35b0068
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) 747 << T->isFunctionType() << T; 748 return QualType(); 749 } 750 751 bool Invalid = false; 752 for (unsigned Idx = 0; Idx < NumParamTypes; ++Idx) { 753 QualType ParamType = adjustParameterType(ParamTypes[Idx]); 754 if (ParamType->isVoidType()) { 755 Diag(Loc, diag::err_param_with_void_type); 756 Invalid = true; 757 } 758 759 ParamTypes[Idx] = ParamType; 760 } 761 762 if (Invalid) 763 return QualType(); 764 765 return Context.getFunctionType(T, ParamTypes, NumParamTypes, Variadic, 766 Quals); 767} 768 769/// \brief Build a member pointer type \c T Class::*. 770/// 771/// \param T the type to which the member pointer refers. 772/// \param Class the class type into which the member pointer points. 773/// \param CVR Qualifiers applied to the member pointer type 774/// \param Loc the location where this type begins 775/// \param Entity the name of the entity that will have this member pointer type 776/// 777/// \returns a member pointer type, if successful, or a NULL type if there was 778/// an error. 779QualType Sema::BuildMemberPointerType(QualType T, QualType Class, 780 unsigned CVR, SourceLocation Loc, 781 DeclarationName Entity) { 782 Qualifiers Quals = Qualifiers::fromCVRMask(CVR); 783 784 // Verify that we're not building a pointer to pointer to function with 785 // exception specification. 786 if (CheckDistantExceptionSpec(T)) { 787 Diag(Loc, diag::err_distant_exception_spec); 788 789 // FIXME: If we're doing this as part of template instantiation, 790 // we should return immediately. 791 792 // Build the type anyway, but use the canonical type so that the 793 // exception specifiers are stripped off. 794 T = Context.getCanonicalType(T); 795 } 796 797 // C++ 8.3.3p3: A pointer to member shall not pointer to ... a member 798 // with reference type, or "cv void." 799 if (T->isReferenceType()) { 800 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference) 801 << (Entity? Entity.getAsString() : "type name") << T; 802 return QualType(); 803 } 804 805 if (T->isVoidType()) { 806 Diag(Loc, diag::err_illegal_decl_mempointer_to_void) 807 << (Entity? Entity.getAsString() : "type name"); 808 return QualType(); 809 } 810 811 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 812 // object or incomplete types shall not be restrict-qualified." 813 if (Quals.hasRestrict() && !T->isIncompleteOrObjectType()) { 814 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 815 << T; 816 817 // FIXME: If we're doing this as part of template instantiation, 818 // we should return immediately. 819 Quals.removeRestrict(); 820 } 821 822 if (!Class->isDependentType() && !Class->isRecordType()) { 823 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class; 824 return QualType(); 825 } 826 827 return Context.getQualifiedType( 828 Context.getMemberPointerType(T, Class.getTypePtr()), Quals); 829} 830 831/// \brief Build a block pointer type. 832/// 833/// \param T The type to which we'll be building a block pointer. 834/// 835/// \param CVR The cvr-qualifiers to be applied to the block pointer type. 836/// 837/// \param Loc The location of the entity whose type involves this 838/// block pointer type or, if there is no such entity, the location of the 839/// type that will have block pointer type. 840/// 841/// \param Entity The name of the entity that involves the block pointer 842/// type, if known. 843/// 844/// \returns A suitable block pointer type, if there are no 845/// errors. Otherwise, returns a NULL type. 846QualType Sema::BuildBlockPointerType(QualType T, unsigned CVR, 847 SourceLocation Loc, 848 DeclarationName Entity) { 849 if (!T->isFunctionType()) { 850 Diag(Loc, diag::err_nonfunction_block_type); 851 return QualType(); 852 } 853 854 Qualifiers Quals = Qualifiers::fromCVRMask(CVR); 855 return Context.getQualifiedType(Context.getBlockPointerType(T), Quals); 856} 857 858QualType Sema::GetTypeFromParser(TypeTy *Ty, TypeSourceInfo **TInfo) { 859 QualType QT = QualType::getFromOpaquePtr(Ty); 860 if (QT.isNull()) { 861 if (TInfo) *TInfo = 0; 862 return QualType(); 863 } 864 865 TypeSourceInfo *DI = 0; 866 if (LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) { 867 QT = LIT->getType(); 868 DI = LIT->getTypeSourceInfo(); 869 } 870 871 if (TInfo) *TInfo = DI; 872 return QT; 873} 874 875/// GetTypeForDeclarator - Convert the type for the specified 876/// declarator to Type instances. 877/// 878/// If OwnedDecl is non-NULL, and this declarator's decl-specifier-seq 879/// owns the declaration of a type (e.g., the definition of a struct 880/// type), then *OwnedDecl will receive the owned declaration. 881QualType Sema::GetTypeForDeclarator(Declarator &D, Scope *S, 882 TypeSourceInfo **TInfo, 883 TagDecl **OwnedDecl) { 884 // Determine the type of the declarator. Not all forms of declarator 885 // have a type. 886 QualType T; 887 888 switch (D.getName().getKind()) { 889 case UnqualifiedId::IK_Identifier: 890 case UnqualifiedId::IK_OperatorFunctionId: 891 case UnqualifiedId::IK_LiteralOperatorId: 892 case UnqualifiedId::IK_TemplateId: 893 T = ConvertDeclSpecToType(D, *this); 894 895 if (!D.isInvalidType() && OwnedDecl && D.getDeclSpec().isTypeSpecOwned()) 896 *OwnedDecl = cast<TagDecl>((Decl *)D.getDeclSpec().getTypeRep()); 897 break; 898 899 case UnqualifiedId::IK_ConstructorName: 900 case UnqualifiedId::IK_DestructorName: 901 // Constructors and destructors don't have return types. Use 902 // "void" instead. 903 T = Context.VoidTy; 904 break; 905 906 case UnqualifiedId::IK_ConversionFunctionId: 907 // The result type of a conversion function is the type that it 908 // converts to. 909 T = GetTypeFromParser(D.getName().ConversionFunctionId); 910 break; 911 } 912 913 if (T.isNull()) 914 return T; 915 916 if (T == Context.UndeducedAutoTy) { 917 int Error = -1; 918 919 switch (D.getContext()) { 920 case Declarator::KNRTypeListContext: 921 assert(0 && "K&R type lists aren't allowed in C++"); 922 break; 923 case Declarator::PrototypeContext: 924 Error = 0; // Function prototype 925 break; 926 case Declarator::MemberContext: 927 switch (cast<TagDecl>(CurContext)->getTagKind()) { 928 case TagDecl::TK_enum: assert(0 && "unhandled tag kind"); break; 929 case TagDecl::TK_struct: Error = 1; /* Struct member */ break; 930 case TagDecl::TK_union: Error = 2; /* Union member */ break; 931 case TagDecl::TK_class: Error = 3; /* Class member */ break; 932 } 933 break; 934 case Declarator::CXXCatchContext: 935 Error = 4; // Exception declaration 936 break; 937 case Declarator::TemplateParamContext: 938 Error = 5; // Template parameter 939 break; 940 case Declarator::BlockLiteralContext: 941 Error = 6; // Block literal 942 break; 943 case Declarator::FileContext: 944 case Declarator::BlockContext: 945 case Declarator::ForContext: 946 case Declarator::ConditionContext: 947 case Declarator::TypeNameContext: 948 break; 949 } 950 951 if (Error != -1) { 952 Diag(D.getDeclSpec().getTypeSpecTypeLoc(), diag::err_auto_not_allowed) 953 << Error; 954 T = Context.IntTy; 955 D.setInvalidType(true); 956 } 957 } 958 959 // The name we're declaring, if any. 960 DeclarationName Name; 961 if (D.getIdentifier()) 962 Name = D.getIdentifier(); 963 964 // Walk the DeclTypeInfo, building the recursive type as we go. 965 // DeclTypeInfos are ordered from the identifier out, which is 966 // opposite of what we want :). 967 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 968 DeclaratorChunk &DeclType = D.getTypeObject(e-i-1); 969 switch (DeclType.Kind) { 970 default: assert(0 && "Unknown decltype!"); 971 case DeclaratorChunk::BlockPointer: 972 // If blocks are disabled, emit an error. 973 if (!LangOpts.Blocks) 974 Diag(DeclType.Loc, diag::err_blocks_disable); 975 976 T = BuildBlockPointerType(T, DeclType.Cls.TypeQuals, D.getIdentifierLoc(), 977 Name); 978 break; 979 case DeclaratorChunk::Pointer: 980 // Verify that we're not building a pointer to pointer to function with 981 // exception specification. 982 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 983 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 984 D.setInvalidType(true); 985 // Build the type anyway. 986 } 987 if (getLangOptions().ObjC1 && T->isObjCInterfaceType()) { 988 const ObjCInterfaceType *OIT = T->getAs<ObjCInterfaceType>(); 989 T = Context.getObjCObjectPointerType(T, 990 (ObjCProtocolDecl **)OIT->qual_begin(), 991 OIT->getNumProtocols()); 992 break; 993 } 994 T = BuildPointerType(T, DeclType.Ptr.TypeQuals, DeclType.Loc, Name); 995 break; 996 case DeclaratorChunk::Reference: { 997 Qualifiers Quals; 998 if (DeclType.Ref.HasRestrict) Quals.addRestrict(); 999 1000 // Verify that we're not building a reference to pointer to function with 1001 // exception specification. 1002 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 1003 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 1004 D.setInvalidType(true); 1005 // Build the type anyway. 1006 } 1007 T = BuildReferenceType(T, DeclType.Ref.LValueRef, Quals, 1008 DeclType.Loc, Name); 1009 break; 1010 } 1011 case DeclaratorChunk::Array: { 1012 // Verify that we're not building an array of pointers to function with 1013 // exception specification. 1014 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 1015 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 1016 D.setInvalidType(true); 1017 // Build the type anyway. 1018 } 1019 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 1020 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 1021 ArrayType::ArraySizeModifier ASM; 1022 if (ATI.isStar) 1023 ASM = ArrayType::Star; 1024 else if (ATI.hasStatic) 1025 ASM = ArrayType::Static; 1026 else 1027 ASM = ArrayType::Normal; 1028 if (ASM == ArrayType::Star && 1029 D.getContext() != Declarator::PrototypeContext) { 1030 // FIXME: This check isn't quite right: it allows star in prototypes 1031 // for function definitions, and disallows some edge cases detailed 1032 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html 1033 Diag(DeclType.Loc, diag::err_array_star_outside_prototype); 1034 ASM = ArrayType::Normal; 1035 D.setInvalidType(true); 1036 } 1037 T = BuildArrayType(T, ASM, ArraySize, 1038 Qualifiers::fromCVRMask(ATI.TypeQuals), 1039 SourceRange(DeclType.Loc, DeclType.EndLoc), Name); 1040 break; 1041 } 1042 case DeclaratorChunk::Function: { 1043 // If the function declarator has a prototype (i.e. it is not () and 1044 // does not have a K&R-style identifier list), then the arguments are part 1045 // of the type, otherwise the argument list is (). 1046 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 1047 1048 // C99 6.7.5.3p1: The return type may not be a function or array type. 1049 // For conversion functions, we'll diagnose this particular error later. 1050 if ((T->isArrayType() || T->isFunctionType()) && 1051 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId)) { 1052 Diag(DeclType.Loc, diag::err_func_returning_array_function) 1053 << T->isFunctionType() << T; 1054 T = Context.IntTy; 1055 D.setInvalidType(true); 1056 } 1057 1058 if (getLangOptions().CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) { 1059 // C++ [dcl.fct]p6: 1060 // Types shall not be defined in return or parameter types. 1061 TagDecl *Tag = cast<TagDecl>((Decl *)D.getDeclSpec().getTypeRep()); 1062 if (Tag->isDefinition()) 1063 Diag(Tag->getLocation(), diag::err_type_defined_in_result_type) 1064 << Context.getTypeDeclType(Tag); 1065 } 1066 1067 // Exception specs are not allowed in typedefs. Complain, but add it 1068 // anyway. 1069 if (FTI.hasExceptionSpec && 1070 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1071 Diag(FTI.getThrowLoc(), diag::err_exception_spec_in_typedef); 1072 1073 if (FTI.NumArgs == 0) { 1074 if (getLangOptions().CPlusPlus) { 1075 // C++ 8.3.5p2: If the parameter-declaration-clause is empty, the 1076 // function takes no arguments. 1077 llvm::SmallVector<QualType, 4> Exceptions; 1078 Exceptions.reserve(FTI.NumExceptions); 1079 for (unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) { 1080 // FIXME: Preserve type source info. 1081 QualType ET = GetTypeFromParser(FTI.Exceptions[ei].Ty); 1082 // Check that the type is valid for an exception spec, and drop it 1083 // if not. 1084 if (!CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range)) 1085 Exceptions.push_back(ET); 1086 } 1087 T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic, FTI.TypeQuals, 1088 FTI.hasExceptionSpec, 1089 FTI.hasAnyExceptionSpec, 1090 Exceptions.size(), Exceptions.data()); 1091 } else if (FTI.isVariadic) { 1092 // We allow a zero-parameter variadic function in C if the 1093 // function is marked with the "overloadable" 1094 // attribute. Scan for this attribute now. 1095 bool Overloadable = false; 1096 for (const AttributeList *Attrs = D.getAttributes(); 1097 Attrs; Attrs = Attrs->getNext()) { 1098 if (Attrs->getKind() == AttributeList::AT_overloadable) { 1099 Overloadable = true; 1100 break; 1101 } 1102 } 1103 1104 if (!Overloadable) 1105 Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); 1106 T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic, 0); 1107 } else { 1108 // Simple void foo(), where the incoming T is the result type. 1109 T = Context.getFunctionNoProtoType(T); 1110 } 1111 } else if (FTI.ArgInfo[0].Param == 0) { 1112 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function definition. 1113 Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 1114 D.setInvalidType(true); 1115 } else { 1116 // Otherwise, we have a function with an argument list that is 1117 // potentially variadic. 1118 llvm::SmallVector<QualType, 16> ArgTys; 1119 1120 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 1121 ParmVarDecl *Param = 1122 cast<ParmVarDecl>(FTI.ArgInfo[i].Param.getAs<Decl>()); 1123 QualType ArgTy = Param->getType(); 1124 assert(!ArgTy.isNull() && "Couldn't parse type?"); 1125 1126 // Adjust the parameter type. 1127 assert((ArgTy == adjustParameterType(ArgTy)) && "Unadjusted type?"); 1128 1129 // Look for 'void'. void is allowed only as a single argument to a 1130 // function with no other parameters (C99 6.7.5.3p10). We record 1131 // int(void) as a FunctionProtoType with an empty argument list. 1132 if (ArgTy->isVoidType()) { 1133 // If this is something like 'float(int, void)', reject it. 'void' 1134 // is an incomplete type (C99 6.2.5p19) and function decls cannot 1135 // have arguments of incomplete type. 1136 if (FTI.NumArgs != 1 || FTI.isVariadic) { 1137 Diag(DeclType.Loc, diag::err_void_only_param); 1138 ArgTy = Context.IntTy; 1139 Param->setType(ArgTy); 1140 } else if (FTI.ArgInfo[i].Ident) { 1141 // Reject, but continue to parse 'int(void abc)'. 1142 Diag(FTI.ArgInfo[i].IdentLoc, 1143 diag::err_param_with_void_type); 1144 ArgTy = Context.IntTy; 1145 Param->setType(ArgTy); 1146 } else { 1147 // Reject, but continue to parse 'float(const void)'. 1148 if (ArgTy.hasQualifiers()) 1149 Diag(DeclType.Loc, diag::err_void_param_qualified); 1150 1151 // Do not add 'void' to the ArgTys list. 1152 break; 1153 } 1154 } else if (!FTI.hasPrototype) { 1155 if (ArgTy->isPromotableIntegerType()) { 1156 ArgTy = Context.getPromotedIntegerType(ArgTy); 1157 } else if (const BuiltinType* BTy = ArgTy->getAs<BuiltinType>()) { 1158 if (BTy->getKind() == BuiltinType::Float) 1159 ArgTy = Context.DoubleTy; 1160 } 1161 } 1162 1163 ArgTys.push_back(ArgTy); 1164 } 1165 1166 llvm::SmallVector<QualType, 4> Exceptions; 1167 Exceptions.reserve(FTI.NumExceptions); 1168 for (unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) { 1169 // FIXME: Preserve type source info. 1170 QualType ET = GetTypeFromParser(FTI.Exceptions[ei].Ty); 1171 // Check that the type is valid for an exception spec, and drop it if 1172 // not. 1173 if (!CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range)) 1174 Exceptions.push_back(ET); 1175 } 1176 1177 T = Context.getFunctionType(T, ArgTys.data(), ArgTys.size(), 1178 FTI.isVariadic, FTI.TypeQuals, 1179 FTI.hasExceptionSpec, 1180 FTI.hasAnyExceptionSpec, 1181 Exceptions.size(), Exceptions.data()); 1182 } 1183 break; 1184 } 1185 case DeclaratorChunk::MemberPointer: 1186 // Verify that we're not building a pointer to pointer to function with 1187 // exception specification. 1188 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 1189 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 1190 D.setInvalidType(true); 1191 // Build the type anyway. 1192 } 1193 // The scope spec must refer to a class, or be dependent. 1194 QualType ClsType; 1195 if (isDependentScopeSpecifier(DeclType.Mem.Scope()) 1196 || dyn_cast_or_null<CXXRecordDecl>( 1197 computeDeclContext(DeclType.Mem.Scope()))) { 1198 NestedNameSpecifier *NNS 1199 = (NestedNameSpecifier *)DeclType.Mem.Scope().getScopeRep(); 1200 NestedNameSpecifier *NNSPrefix = NNS->getPrefix(); 1201 switch (NNS->getKind()) { 1202 case NestedNameSpecifier::Identifier: 1203 ClsType = Context.getTypenameType(NNSPrefix, NNS->getAsIdentifier()); 1204 break; 1205 1206 case NestedNameSpecifier::Namespace: 1207 case NestedNameSpecifier::Global: 1208 llvm_unreachable("Nested-name-specifier must name a type"); 1209 break; 1210 1211 case NestedNameSpecifier::TypeSpec: 1212 case NestedNameSpecifier::TypeSpecWithTemplate: 1213 ClsType = QualType(NNS->getAsType(), 0); 1214 if (NNSPrefix) 1215 ClsType = Context.getQualifiedNameType(NNSPrefix, ClsType); 1216 break; 1217 } 1218 } else { 1219 Diag(DeclType.Mem.Scope().getBeginLoc(), 1220 diag::err_illegal_decl_mempointer_in_nonclass) 1221 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 1222 << DeclType.Mem.Scope().getRange(); 1223 D.setInvalidType(true); 1224 } 1225 1226 if (!ClsType.isNull()) 1227 T = BuildMemberPointerType(T, ClsType, DeclType.Mem.TypeQuals, 1228 DeclType.Loc, D.getIdentifier()); 1229 if (T.isNull()) { 1230 T = Context.IntTy; 1231 D.setInvalidType(true); 1232 } 1233 break; 1234 } 1235 1236 if (T.isNull()) { 1237 D.setInvalidType(true); 1238 T = Context.IntTy; 1239 } 1240 1241 // See if there are any attributes on this declarator chunk. 1242 if (const AttributeList *AL = DeclType.getAttrs()) 1243 ProcessTypeAttributeList(T, AL); 1244 } 1245 1246 if (getLangOptions().CPlusPlus && T->isFunctionType()) { 1247 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>(); 1248 assert(FnTy && "Why oh why is there not a FunctionProtoType here?"); 1249 1250 // C++ 8.3.5p4: A cv-qualifier-seq shall only be part of the function type 1251 // for a nonstatic member function, the function type to which a pointer 1252 // to member refers, or the top-level function type of a function typedef 1253 // declaration. 1254 if (FnTy->getTypeQuals() != 0 && 1255 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 1256 ((D.getContext() != Declarator::MemberContext && 1257 (!D.getCXXScopeSpec().isSet() || 1258 !computeDeclContext(D.getCXXScopeSpec(), /*FIXME:*/true) 1259 ->isRecord())) || 1260 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static)) { 1261 if (D.isFunctionDeclarator()) 1262 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_function_type); 1263 else 1264 Diag(D.getIdentifierLoc(), 1265 diag::err_invalid_qualified_typedef_function_type_use); 1266 1267 // Strip the cv-quals from the type. 1268 T = Context.getFunctionType(FnTy->getResultType(), FnTy->arg_type_begin(), 1269 FnTy->getNumArgs(), FnTy->isVariadic(), 0); 1270 } 1271 } 1272 1273 // If there were any type attributes applied to the decl itself (not the 1274 // type, apply the type attribute to the type!) 1275 if (const AttributeList *Attrs = D.getAttributes()) 1276 ProcessTypeAttributeList(T, Attrs); 1277 1278 if (TInfo) { 1279 if (D.isInvalidType()) 1280 *TInfo = 0; 1281 else 1282 *TInfo = GetTypeSourceInfoForDeclarator(D, T); 1283 } 1284 1285 return T; 1286} 1287 1288namespace { 1289 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> { 1290 const DeclSpec &DS; 1291 1292 public: 1293 TypeSpecLocFiller(const DeclSpec &DS) : DS(DS) {} 1294 1295 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 1296 Visit(TL.getUnqualifiedLoc()); 1297 } 1298 void VisitTypedefTypeLoc(TypedefTypeLoc TL) { 1299 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 1300 } 1301 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) { 1302 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 1303 1304 if (DS.getProtocolQualifiers()) { 1305 assert(TL.getNumProtocols() > 0); 1306 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 1307 TL.setLAngleLoc(DS.getProtocolLAngleLoc()); 1308 TL.setRAngleLoc(DS.getSourceRange().getEnd()); 1309 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i) 1310 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]); 1311 } else { 1312 assert(TL.getNumProtocols() == 0); 1313 TL.setLAngleLoc(SourceLocation()); 1314 TL.setRAngleLoc(SourceLocation()); 1315 } 1316 } 1317 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 1318 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 1319 1320 TL.setStarLoc(SourceLocation()); 1321 1322 if (DS.getProtocolQualifiers()) { 1323 assert(TL.getNumProtocols() > 0); 1324 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 1325 TL.setHasProtocolsAsWritten(true); 1326 TL.setLAngleLoc(DS.getProtocolLAngleLoc()); 1327 TL.setRAngleLoc(DS.getSourceRange().getEnd()); 1328 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i) 1329 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]); 1330 1331 } else { 1332 assert(TL.getNumProtocols() == 0); 1333 TL.setHasProtocolsAsWritten(false); 1334 TL.setLAngleLoc(SourceLocation()); 1335 TL.setRAngleLoc(SourceLocation()); 1336 } 1337 1338 // This might not have been written with an inner type. 1339 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) { 1340 TL.setHasBaseTypeAsWritten(false); 1341 TL.getBaseTypeLoc().initialize(SourceLocation()); 1342 } else { 1343 TL.setHasBaseTypeAsWritten(true); 1344 Visit(TL.getBaseTypeLoc()); 1345 } 1346 } 1347 void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) { 1348 TypeSourceInfo *TInfo = 0; 1349 Sema::GetTypeFromParser(DS.getTypeRep(), &TInfo); 1350 1351 // If we got no declarator info from previous Sema routines, 1352 // just fill with the typespec loc. 1353 if (!TInfo) { 1354 TL.initialize(DS.getTypeSpecTypeLoc()); 1355 return; 1356 } 1357 1358 TemplateSpecializationTypeLoc OldTL = 1359 cast<TemplateSpecializationTypeLoc>(TInfo->getTypeLoc()); 1360 TL.copy(OldTL); 1361 } 1362 void VisitTypeLoc(TypeLoc TL) { 1363 // FIXME: add other typespec types and change this to an assert. 1364 TL.initialize(DS.getTypeSpecTypeLoc()); 1365 } 1366 }; 1367 1368 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> { 1369 const DeclaratorChunk &Chunk; 1370 1371 public: 1372 DeclaratorLocFiller(const DeclaratorChunk &Chunk) : Chunk(Chunk) {} 1373 1374 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 1375 llvm_unreachable("qualified type locs not expected here!"); 1376 } 1377 1378 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) { 1379 assert(Chunk.Kind == DeclaratorChunk::BlockPointer); 1380 TL.setCaretLoc(Chunk.Loc); 1381 } 1382 void VisitPointerTypeLoc(PointerTypeLoc TL) { 1383 assert(Chunk.Kind == DeclaratorChunk::Pointer); 1384 TL.setStarLoc(Chunk.Loc); 1385 } 1386 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 1387 assert(Chunk.Kind == DeclaratorChunk::Pointer); 1388 TL.setStarLoc(Chunk.Loc); 1389 TL.setHasBaseTypeAsWritten(true); 1390 TL.setHasProtocolsAsWritten(false); 1391 TL.setLAngleLoc(SourceLocation()); 1392 TL.setRAngleLoc(SourceLocation()); 1393 } 1394 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) { 1395 assert(Chunk.Kind == DeclaratorChunk::MemberPointer); 1396 TL.setStarLoc(Chunk.Loc); 1397 // FIXME: nested name specifier 1398 } 1399 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) { 1400 assert(Chunk.Kind == DeclaratorChunk::Reference); 1401 // 'Amp' is misleading: this might have been originally 1402 /// spelled with AmpAmp. 1403 TL.setAmpLoc(Chunk.Loc); 1404 } 1405 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) { 1406 assert(Chunk.Kind == DeclaratorChunk::Reference); 1407 assert(!Chunk.Ref.LValueRef); 1408 TL.setAmpAmpLoc(Chunk.Loc); 1409 } 1410 void VisitArrayTypeLoc(ArrayTypeLoc TL) { 1411 assert(Chunk.Kind == DeclaratorChunk::Array); 1412 TL.setLBracketLoc(Chunk.Loc); 1413 TL.setRBracketLoc(Chunk.EndLoc); 1414 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts)); 1415 } 1416 void VisitFunctionTypeLoc(FunctionTypeLoc TL) { 1417 assert(Chunk.Kind == DeclaratorChunk::Function); 1418 TL.setLParenLoc(Chunk.Loc); 1419 TL.setRParenLoc(Chunk.EndLoc); 1420 1421 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun; 1422 for (unsigned i = 0, e = TL.getNumArgs(), tpi = 0; i != e; ++i) { 1423 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 1424 TL.setArg(tpi++, Param); 1425 } 1426 // FIXME: exception specs 1427 } 1428 1429 void VisitTypeLoc(TypeLoc TL) { 1430 llvm_unreachable("unsupported TypeLoc kind in declarator!"); 1431 } 1432 }; 1433} 1434 1435/// \brief Create and instantiate a TypeSourceInfo with type source information. 1436/// 1437/// \param T QualType referring to the type as written in source code. 1438TypeSourceInfo * 1439Sema::GetTypeSourceInfoForDeclarator(Declarator &D, QualType T) { 1440 TypeSourceInfo *TInfo = Context.CreateTypeSourceInfo(T); 1441 UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc(); 1442 1443 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 1444 DeclaratorLocFiller(D.getTypeObject(i)).Visit(CurrTL); 1445 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 1446 } 1447 1448 TypeSpecLocFiller(D.getDeclSpec()).Visit(CurrTL); 1449 1450 return TInfo; 1451} 1452 1453/// \brief Create a LocInfoType to hold the given QualType and TypeSourceInfo. 1454QualType Sema::CreateLocInfoType(QualType T, TypeSourceInfo *TInfo) { 1455 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser 1456 // and Sema during declaration parsing. Try deallocating/caching them when 1457 // it's appropriate, instead of allocating them and keeping them around. 1458 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType), 8); 1459 new (LocT) LocInfoType(T, TInfo); 1460 assert(LocT->getTypeClass() != T->getTypeClass() && 1461 "LocInfoType's TypeClass conflicts with an existing Type class"); 1462 return QualType(LocT, 0); 1463} 1464 1465void LocInfoType::getAsStringInternal(std::string &Str, 1466 const PrintingPolicy &Policy) const { 1467 assert(false && "LocInfoType leaked into the type system; an opaque TypeTy*" 1468 " was used directly instead of getting the QualType through" 1469 " GetTypeFromParser"); 1470} 1471 1472/// UnwrapSimilarPointerTypes - If T1 and T2 are pointer types that 1473/// may be similar (C++ 4.4), replaces T1 and T2 with the type that 1474/// they point to and return true. If T1 and T2 aren't pointer types 1475/// or pointer-to-member types, or if they are not similar at this 1476/// level, returns false and leaves T1 and T2 unchanged. Top-level 1477/// qualifiers on T1 and T2 are ignored. This function will typically 1478/// be called in a loop that successively "unwraps" pointer and 1479/// pointer-to-member types to compare them at each level. 1480bool Sema::UnwrapSimilarPointerTypes(QualType& T1, QualType& T2) { 1481 const PointerType *T1PtrType = T1->getAs<PointerType>(), 1482 *T2PtrType = T2->getAs<PointerType>(); 1483 if (T1PtrType && T2PtrType) { 1484 T1 = T1PtrType->getPointeeType(); 1485 T2 = T2PtrType->getPointeeType(); 1486 return true; 1487 } 1488 1489 const MemberPointerType *T1MPType = T1->getAs<MemberPointerType>(), 1490 *T2MPType = T2->getAs<MemberPointerType>(); 1491 if (T1MPType && T2MPType && 1492 Context.getCanonicalType(T1MPType->getClass()) == 1493 Context.getCanonicalType(T2MPType->getClass())) { 1494 T1 = T1MPType->getPointeeType(); 1495 T2 = T2MPType->getPointeeType(); 1496 return true; 1497 } 1498 return false; 1499} 1500 1501Sema::TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 1502 // C99 6.7.6: Type names have no identifier. This is already validated by 1503 // the parser. 1504 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 1505 1506 TypeSourceInfo *TInfo = 0; 1507 TagDecl *OwnedTag = 0; 1508 QualType T = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 1509 if (D.isInvalidType()) 1510 return true; 1511 1512 if (getLangOptions().CPlusPlus) { 1513 // Check that there are no default arguments (C++ only). 1514 CheckExtraCXXDefaultArguments(D); 1515 1516 // C++0x [dcl.type]p3: 1517 // A type-specifier-seq shall not define a class or enumeration 1518 // unless it appears in the type-id of an alias-declaration 1519 // (7.1.3). 1520 if (OwnedTag && OwnedTag->isDefinition()) 1521 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_type_specifier) 1522 << Context.getTypeDeclType(OwnedTag); 1523 } 1524 1525 if (TInfo) 1526 T = CreateLocInfoType(T, TInfo); 1527 1528 return T.getAsOpaquePtr(); 1529} 1530 1531 1532 1533//===----------------------------------------------------------------------===// 1534// Type Attribute Processing 1535//===----------------------------------------------------------------------===// 1536 1537/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 1538/// specified type. The attribute contains 1 argument, the id of the address 1539/// space for the type. 1540static void HandleAddressSpaceTypeAttribute(QualType &Type, 1541 const AttributeList &Attr, Sema &S){ 1542 1543 // If this type is already address space qualified, reject it. 1544 // Clause 6.7.3 - Type qualifiers: "No type shall be qualified by qualifiers 1545 // for two or more different address spaces." 1546 if (Type.getAddressSpace()) { 1547 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 1548 return; 1549 } 1550 1551 // Check the attribute arguments. 1552 if (Attr.getNumArgs() != 1) { 1553 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1554 return; 1555 } 1556 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 1557 llvm::APSInt addrSpace(32); 1558 if (!ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 1559 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 1560 << ASArgExpr->getSourceRange(); 1561 return; 1562 } 1563 1564 // Bounds checking. 1565 if (addrSpace.isSigned()) { 1566 if (addrSpace.isNegative()) { 1567 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative) 1568 << ASArgExpr->getSourceRange(); 1569 return; 1570 } 1571 addrSpace.setIsSigned(false); 1572 } 1573 llvm::APSInt max(addrSpace.getBitWidth()); 1574 max = Qualifiers::MaxAddressSpace; 1575 if (addrSpace > max) { 1576 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high) 1577 << Qualifiers::MaxAddressSpace << ASArgExpr->getSourceRange(); 1578 return; 1579 } 1580 1581 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 1582 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 1583} 1584 1585/// HandleObjCGCTypeAttribute - Process an objc's gc attribute on the 1586/// specified type. The attribute contains 1 argument, weak or strong. 1587static void HandleObjCGCTypeAttribute(QualType &Type, 1588 const AttributeList &Attr, Sema &S) { 1589 if (Type.getObjCGCAttr() != Qualifiers::GCNone) { 1590 S.Diag(Attr.getLoc(), diag::err_attribute_multiple_objc_gc); 1591 return; 1592 } 1593 1594 // Check the attribute arguments. 1595 if (!Attr.getParameterName()) { 1596 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) 1597 << "objc_gc" << 1; 1598 return; 1599 } 1600 Qualifiers::GC GCAttr; 1601 if (Attr.getNumArgs() != 0) { 1602 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1603 return; 1604 } 1605 if (Attr.getParameterName()->isStr("weak")) 1606 GCAttr = Qualifiers::Weak; 1607 else if (Attr.getParameterName()->isStr("strong")) 1608 GCAttr = Qualifiers::Strong; 1609 else { 1610 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported) 1611 << "objc_gc" << Attr.getParameterName(); 1612 return; 1613 } 1614 1615 Type = S.Context.getObjCGCQualType(Type, GCAttr); 1616} 1617 1618/// HandleNoReturnTypeAttribute - Process the noreturn attribute on the 1619/// specified type. The attribute contains 0 arguments. 1620static void HandleNoReturnTypeAttribute(QualType &Type, 1621 const AttributeList &Attr, Sema &S) { 1622 if (Attr.getNumArgs() != 0) 1623 return; 1624 1625 // We only apply this to a pointer to function or a pointer to block. 1626 if (!Type->isFunctionPointerType() 1627 && !Type->isBlockPointerType() 1628 && !Type->isFunctionType()) 1629 return; 1630 1631 Type = S.Context.getNoReturnType(Type); 1632} 1633 1634/// HandleVectorSizeAttribute - this attribute is only applicable to integral 1635/// and float scalars, although arrays, pointers, and function return values are 1636/// allowed in conjunction with this construct. Aggregates with this attribute 1637/// are invalid, even if they are of the same size as a corresponding scalar. 1638/// The raw attribute should contain precisely 1 argument, the vector size for 1639/// the variable, measured in bytes. If curType and rawAttr are well formed, 1640/// this routine will return a new vector type. 1641static void HandleVectorSizeAttr(QualType& CurType, const AttributeList &Attr, Sema &S) { 1642 // Check the attribute arugments. 1643 if (Attr.getNumArgs() != 1) { 1644 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1645 return; 1646 } 1647 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 1648 llvm::APSInt vecSize(32); 1649 if (!sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) { 1650 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 1651 << "vector_size" << sizeExpr->getSourceRange(); 1652 return; 1653 } 1654 // the base type must be integer or float, and can't already be a vector. 1655 if (CurType->isVectorType() || 1656 (!CurType->isIntegerType() && !CurType->isRealFloatingType())) { 1657 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType; 1658 return; 1659 } 1660 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 1661 // vecSize is specified in bytes - convert to bits. 1662 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8); 1663 1664 // the vector size needs to be an integral multiple of the type size. 1665 if (vectorSize % typeSize) { 1666 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 1667 << sizeExpr->getSourceRange(); 1668 return; 1669 } 1670 if (vectorSize == 0) { 1671 S.Diag(Attr.getLoc(), diag::err_attribute_zero_size) 1672 << sizeExpr->getSourceRange(); 1673 return; 1674 } 1675 1676 // Success! Instantiate the vector type, the number of elements is > 0, and 1677 // not required to be a power of 2, unlike GCC. 1678 CurType = S.Context.getVectorType(CurType, vectorSize/typeSize); 1679} 1680 1681void Sema::ProcessTypeAttributeList(QualType &Result, const AttributeList *AL) { 1682 // Scan through and apply attributes to this type where it makes sense. Some 1683 // attributes (such as __address_space__, __vector_size__, etc) apply to the 1684 // type, but others can be present in the type specifiers even though they 1685 // apply to the decl. Here we apply type attributes and ignore the rest. 1686 for (; AL; AL = AL->getNext()) { 1687 // If this is an attribute we can handle, do so now, otherwise, add it to 1688 // the LeftOverAttrs list for rechaining. 1689 switch (AL->getKind()) { 1690 default: break; 1691 case AttributeList::AT_address_space: 1692 HandleAddressSpaceTypeAttribute(Result, *AL, *this); 1693 break; 1694 case AttributeList::AT_objc_gc: 1695 HandleObjCGCTypeAttribute(Result, *AL, *this); 1696 break; 1697 case AttributeList::AT_noreturn: 1698 HandleNoReturnTypeAttribute(Result, *AL, *this); 1699 break; 1700 case AttributeList::AT_vector_size: 1701 HandleVectorSizeAttr(Result, *AL, *this); 1702 break; 1703 } 1704 } 1705} 1706 1707/// @brief Ensure that the type T is a complete type. 1708/// 1709/// This routine checks whether the type @p T is complete in any 1710/// context where a complete type is required. If @p T is a complete 1711/// type, returns false. If @p T is a class template specialization, 1712/// this routine then attempts to perform class template 1713/// instantiation. If instantiation fails, or if @p T is incomplete 1714/// and cannot be completed, issues the diagnostic @p diag (giving it 1715/// the type @p T) and returns true. 1716/// 1717/// @param Loc The location in the source that the incomplete type 1718/// diagnostic should refer to. 1719/// 1720/// @param T The type that this routine is examining for completeness. 1721/// 1722/// @param PD The partial diagnostic that will be printed out if T is not a 1723/// complete type. 1724/// 1725/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 1726/// @c false otherwise. 1727bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 1728 const PartialDiagnostic &PD, 1729 std::pair<SourceLocation, 1730 PartialDiagnostic> Note) { 1731 unsigned diag = PD.getDiagID(); 1732 1733 // FIXME: Add this assertion to make sure we always get instantiation points. 1734 // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType"); 1735 // FIXME: Add this assertion to help us flush out problems with 1736 // checking for dependent types and type-dependent expressions. 1737 // 1738 // assert(!T->isDependentType() && 1739 // "Can't ask whether a dependent type is complete"); 1740 1741 // If we have a complete type, we're done. 1742 if (!T->isIncompleteType()) 1743 return false; 1744 1745 // If we have a class template specialization or a class member of a 1746 // class template specialization, or an array with known size of such, 1747 // try to instantiate it. 1748 QualType MaybeTemplate = T; 1749 if (const ConstantArrayType *Array = Context.getAsConstantArrayType(T)) 1750 MaybeTemplate = Array->getElementType(); 1751 if (const RecordType *Record = MaybeTemplate->getAs<RecordType>()) { 1752 if (ClassTemplateSpecializationDecl *ClassTemplateSpec 1753 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { 1754 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) 1755 return InstantiateClassTemplateSpecialization(Loc, ClassTemplateSpec, 1756 TSK_ImplicitInstantiation, 1757 /*Complain=*/diag != 0); 1758 } else if (CXXRecordDecl *Rec 1759 = dyn_cast<CXXRecordDecl>(Record->getDecl())) { 1760 if (CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass()) { 1761 MemberSpecializationInfo *MSInfo = Rec->getMemberSpecializationInfo(); 1762 assert(MSInfo && "Missing member specialization information?"); 1763 // This record was instantiated from a class within a template. 1764 if (MSInfo->getTemplateSpecializationKind() 1765 != TSK_ExplicitSpecialization) 1766 return InstantiateClass(Loc, Rec, Pattern, 1767 getTemplateInstantiationArgs(Rec), 1768 TSK_ImplicitInstantiation, 1769 /*Complain=*/diag != 0); 1770 } 1771 } 1772 } 1773 1774 if (diag == 0) 1775 return true; 1776 1777 // We have an incomplete type. Produce a diagnostic. 1778 Diag(Loc, PD) << T; 1779 1780 // If we have a note, produce it. 1781 if (!Note.first.isInvalid()) 1782 Diag(Note.first, Note.second); 1783 1784 // If the type was a forward declaration of a class/struct/union 1785 // type, produce 1786 const TagType *Tag = 0; 1787 if (const RecordType *Record = T->getAs<RecordType>()) 1788 Tag = Record; 1789 else if (const EnumType *Enum = T->getAs<EnumType>()) 1790 Tag = Enum; 1791 1792 if (Tag && !Tag->getDecl()->isInvalidDecl()) 1793 Diag(Tag->getDecl()->getLocation(), 1794 Tag->isBeingDefined() ? diag::note_type_being_defined 1795 : diag::note_forward_declaration) 1796 << QualType(Tag, 0); 1797 1798 return true; 1799} 1800 1801/// \brief Retrieve a version of the type 'T' that is qualified by the 1802/// nested-name-specifier contained in SS. 1803QualType Sema::getQualifiedNameType(const CXXScopeSpec &SS, QualType T) { 1804 if (!SS.isSet() || SS.isInvalid() || T.isNull()) 1805 return T; 1806 1807 NestedNameSpecifier *NNS 1808 = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 1809 return Context.getQualifiedNameType(NNS, T); 1810} 1811 1812QualType Sema::BuildTypeofExprType(Expr *E) { 1813 if (E->getType() == Context.OverloadTy) { 1814 // C++ [temp.arg.explicit]p3 allows us to resolve a template-id to a 1815 // function template specialization wherever deduction cannot occur. 1816 if (FunctionDecl *Specialization 1817 = ResolveSingleFunctionTemplateSpecialization(E)) { 1818 E = FixOverloadedFunctionReference(E, Specialization); 1819 if (!E) 1820 return QualType(); 1821 } else { 1822 Diag(E->getLocStart(), 1823 diag::err_cannot_determine_declared_type_of_overloaded_function) 1824 << false << E->getSourceRange(); 1825 return QualType(); 1826 } 1827 } 1828 1829 return Context.getTypeOfExprType(E); 1830} 1831 1832QualType Sema::BuildDecltypeType(Expr *E) { 1833 if (E->getType() == Context.OverloadTy) { 1834 // C++ [temp.arg.explicit]p3 allows us to resolve a template-id to a 1835 // function template specialization wherever deduction cannot occur. 1836 if (FunctionDecl *Specialization 1837 = ResolveSingleFunctionTemplateSpecialization(E)) { 1838 E = FixOverloadedFunctionReference(E, Specialization); 1839 if (!E) 1840 return QualType(); 1841 } else { 1842 Diag(E->getLocStart(), 1843 diag::err_cannot_determine_declared_type_of_overloaded_function) 1844 << true << E->getSourceRange(); 1845 return QualType(); 1846 } 1847 } 1848 1849 return Context.getDecltypeType(E); 1850} 1851