SemaType.cpp revision 406b56a9a0ed38e9fbcea1f51ea28ee3719517d3
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 = Context.getTypeOfExprType(E); 312 break; 313 } 314 case DeclSpec::TST_decltype: { 315 Expr *E = static_cast<Expr *>(DS.getTypeRep()); 316 assert(E && "Didn't get an expression for decltype?"); 317 // TypeQuals handled by caller. 318 Result = TheSema.BuildDecltypeType(E); 319 if (Result.isNull()) { 320 Result = Context.IntTy; 321 TheDeclarator.setInvalidType(true); 322 } 323 break; 324 } 325 case DeclSpec::TST_auto: { 326 // TypeQuals handled by caller. 327 Result = Context.UndeducedAutoTy; 328 break; 329 } 330 331 case DeclSpec::TST_error: 332 Result = Context.IntTy; 333 TheDeclarator.setInvalidType(true); 334 break; 335 } 336 337 // Handle complex types. 338 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) { 339 if (TheSema.getLangOptions().Freestanding) 340 TheSema.Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex); 341 Result = Context.getComplexType(Result); 342 } 343 344 assert(DS.getTypeSpecComplex() != DeclSpec::TSC_imaginary && 345 "FIXME: imaginary types not supported yet!"); 346 347 // See if there are any attributes on the declspec that apply to the type (as 348 // opposed to the decl). 349 if (const AttributeList *AL = DS.getAttributes()) 350 TheSema.ProcessTypeAttributeList(Result, AL); 351 352 // Apply const/volatile/restrict qualifiers to T. 353 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 354 355 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 356 // or incomplete types shall not be restrict-qualified." C++ also allows 357 // restrict-qualified references. 358 if (TypeQuals & DeclSpec::TQ_restrict) { 359 if (Result->isPointerType() || Result->isReferenceType()) { 360 QualType EltTy = Result->isPointerType() ? 361 Result->getAs<PointerType>()->getPointeeType() : 362 Result->getAs<ReferenceType>()->getPointeeType(); 363 364 // If we have a pointer or reference, the pointee must have an object 365 // incomplete type. 366 if (!EltTy->isIncompleteOrObjectType()) { 367 TheSema.Diag(DS.getRestrictSpecLoc(), 368 diag::err_typecheck_invalid_restrict_invalid_pointee) 369 << EltTy << DS.getSourceRange(); 370 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 371 } 372 } else { 373 TheSema.Diag(DS.getRestrictSpecLoc(), 374 diag::err_typecheck_invalid_restrict_not_pointer) 375 << Result << DS.getSourceRange(); 376 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 377 } 378 } 379 380 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification 381 // of a function type includes any type qualifiers, the behavior is 382 // undefined." 383 if (Result->isFunctionType() && TypeQuals) { 384 // Get some location to point at, either the C or V location. 385 SourceLocation Loc; 386 if (TypeQuals & DeclSpec::TQ_const) 387 Loc = DS.getConstSpecLoc(); 388 else if (TypeQuals & DeclSpec::TQ_volatile) 389 Loc = DS.getVolatileSpecLoc(); 390 else { 391 assert((TypeQuals & DeclSpec::TQ_restrict) && 392 "Has CVR quals but not C, V, or R?"); 393 Loc = DS.getRestrictSpecLoc(); 394 } 395 TheSema.Diag(Loc, diag::warn_typecheck_function_qualifiers) 396 << Result << DS.getSourceRange(); 397 } 398 399 // C++ [dcl.ref]p1: 400 // Cv-qualified references are ill-formed except when the 401 // cv-qualifiers are introduced through the use of a typedef 402 // (7.1.3) or of a template type argument (14.3), in which 403 // case the cv-qualifiers are ignored. 404 // FIXME: Shouldn't we be checking SCS_typedef here? 405 if (DS.getTypeSpecType() == DeclSpec::TST_typename && 406 TypeQuals && Result->isReferenceType()) { 407 TypeQuals &= ~DeclSpec::TQ_const; 408 TypeQuals &= ~DeclSpec::TQ_volatile; 409 } 410 411 Qualifiers Quals = Qualifiers::fromCVRMask(TypeQuals); 412 Result = Context.getQualifiedType(Result, Quals); 413 } 414 415 return Result; 416} 417 418static std::string getPrintableNameForEntity(DeclarationName Entity) { 419 if (Entity) 420 return Entity.getAsString(); 421 422 return "type name"; 423} 424 425/// \brief Build a pointer type. 426/// 427/// \param T The type to which we'll be building a pointer. 428/// 429/// \param Quals The cvr-qualifiers to be applied to the pointer type. 430/// 431/// \param Loc The location of the entity whose type involves this 432/// pointer type or, if there is no such entity, the location of the 433/// type that will have pointer type. 434/// 435/// \param Entity The name of the entity that involves the pointer 436/// type, if known. 437/// 438/// \returns A suitable pointer type, if there are no 439/// errors. Otherwise, returns a NULL type. 440QualType Sema::BuildPointerType(QualType T, unsigned Quals, 441 SourceLocation Loc, DeclarationName Entity) { 442 if (T->isReferenceType()) { 443 // C++ 8.3.2p4: There shall be no ... pointers to references ... 444 Diag(Loc, diag::err_illegal_decl_pointer_to_reference) 445 << getPrintableNameForEntity(Entity) << T; 446 return QualType(); 447 } 448 449 Qualifiers Qs = Qualifiers::fromCVRMask(Quals); 450 451 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 452 // object or incomplete types shall not be restrict-qualified." 453 if (Qs.hasRestrict() && !T->isIncompleteOrObjectType()) { 454 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 455 << T; 456 Qs.removeRestrict(); 457 } 458 459 // Build the pointer type. 460 return Context.getQualifiedType(Context.getPointerType(T), Qs); 461} 462 463/// \brief Build a reference type. 464/// 465/// \param T The type to which we'll be building a reference. 466/// 467/// \param CVR The cvr-qualifiers to be applied to the reference type. 468/// 469/// \param Loc The location of the entity whose type involves this 470/// reference type or, if there is no such entity, the location of the 471/// type that will have reference type. 472/// 473/// \param Entity The name of the entity that involves the reference 474/// type, if known. 475/// 476/// \returns A suitable reference type, if there are no 477/// errors. Otherwise, returns a NULL type. 478QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue, 479 unsigned CVR, SourceLocation Loc, 480 DeclarationName Entity) { 481 Qualifiers Quals = Qualifiers::fromCVRMask(CVR); 482 483 bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>(); 484 485 // C++0x [dcl.typedef]p9: If a typedef TD names a type that is a 486 // reference to a type T, and attempt to create the type "lvalue 487 // reference to cv TD" creates the type "lvalue reference to T". 488 // We use the qualifiers (restrict or none) of the original reference, 489 // not the new ones. This is consistent with GCC. 490 491 // C++ [dcl.ref]p4: There shall be no references to references. 492 // 493 // According to C++ DR 106, references to references are only 494 // diagnosed when they are written directly (e.g., "int & &"), 495 // but not when they happen via a typedef: 496 // 497 // typedef int& intref; 498 // typedef intref& intref2; 499 // 500 // Parser::ParseDeclaratorInternal diagnoses the case where 501 // references are written directly; here, we handle the 502 // collapsing of references-to-references as described in C++ 503 // DR 106 and amended by C++ DR 540. 504 505 // C++ [dcl.ref]p1: 506 // A declarator that specifies the type "reference to cv void" 507 // is ill-formed. 508 if (T->isVoidType()) { 509 Diag(Loc, diag::err_reference_to_void); 510 return QualType(); 511 } 512 513 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 514 // object or incomplete types shall not be restrict-qualified." 515 if (Quals.hasRestrict() && !T->isIncompleteOrObjectType()) { 516 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 517 << T; 518 Quals.removeRestrict(); 519 } 520 521 // C++ [dcl.ref]p1: 522 // [...] Cv-qualified references are ill-formed except when the 523 // cv-qualifiers are introduced through the use of a typedef 524 // (7.1.3) or of a template type argument (14.3), in which case 525 // the cv-qualifiers are ignored. 526 // 527 // We diagnose extraneous cv-qualifiers for the non-typedef, 528 // non-template type argument case within the parser. Here, we just 529 // ignore any extraneous cv-qualifiers. 530 Quals.removeConst(); 531 Quals.removeVolatile(); 532 533 // Handle restrict on references. 534 if (LValueRef) 535 return Context.getQualifiedType( 536 Context.getLValueReferenceType(T, SpelledAsLValue), Quals); 537 return Context.getQualifiedType(Context.getRValueReferenceType(T), Quals); 538} 539 540/// \brief Build an array type. 541/// 542/// \param T The type of each element in the array. 543/// 544/// \param ASM C99 array size modifier (e.g., '*', 'static'). 545/// 546/// \param ArraySize Expression describing the size of the array. 547/// 548/// \param Quals The cvr-qualifiers to be applied to the array's 549/// element type. 550/// 551/// \param Loc The location of the entity whose type involves this 552/// array type or, if there is no such entity, the location of the 553/// type that will have array type. 554/// 555/// \param Entity The name of the entity that involves the array 556/// type, if known. 557/// 558/// \returns A suitable array type, if there are no errors. Otherwise, 559/// returns a NULL type. 560QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM, 561 Expr *ArraySize, unsigned Quals, 562 SourceRange Brackets, DeclarationName Entity) { 563 564 SourceLocation Loc = Brackets.getBegin(); 565 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 566 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 567 // Not in C++, though. There we only dislike void. 568 if (getLangOptions().CPlusPlus) { 569 if (T->isVoidType()) { 570 Diag(Loc, diag::err_illegal_decl_array_incomplete_type) << T; 571 return QualType(); 572 } 573 } else { 574 if (RequireCompleteType(Loc, T, 575 diag::err_illegal_decl_array_incomplete_type)) 576 return QualType(); 577 } 578 579 if (T->isFunctionType()) { 580 Diag(Loc, diag::err_illegal_decl_array_of_functions) 581 << getPrintableNameForEntity(Entity) << T; 582 return QualType(); 583 } 584 585 // C++ 8.3.2p4: There shall be no ... arrays of references ... 586 if (T->isReferenceType()) { 587 Diag(Loc, diag::err_illegal_decl_array_of_references) 588 << getPrintableNameForEntity(Entity) << T; 589 return QualType(); 590 } 591 592 if (Context.getCanonicalType(T) == Context.UndeducedAutoTy) { 593 Diag(Loc, diag::err_illegal_decl_array_of_auto) 594 << getPrintableNameForEntity(Entity); 595 return QualType(); 596 } 597 598 if (const RecordType *EltTy = T->getAs<RecordType>()) { 599 // If the element type is a struct or union that contains a variadic 600 // array, accept it as a GNU extension: C99 6.7.2.1p2. 601 if (EltTy->getDecl()->hasFlexibleArrayMember()) 602 Diag(Loc, diag::ext_flexible_array_in_array) << T; 603 } else if (T->isObjCInterfaceType()) { 604 Diag(Loc, diag::err_objc_array_of_interfaces) << T; 605 return QualType(); 606 } 607 608 // C99 6.7.5.2p1: The size expression shall have integer type. 609 if (ArraySize && !ArraySize->isTypeDependent() && 610 !ArraySize->getType()->isIntegerType()) { 611 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 612 << ArraySize->getType() << ArraySize->getSourceRange(); 613 ArraySize->Destroy(Context); 614 return QualType(); 615 } 616 llvm::APSInt ConstVal(32); 617 if (!ArraySize) { 618 if (ASM == ArrayType::Star) 619 T = Context.getVariableArrayType(T, 0, ASM, Quals, Brackets); 620 else 621 T = Context.getIncompleteArrayType(T, ASM, Quals); 622 } else if (ArraySize->isValueDependent()) { 623 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets); 624 } else if (!ArraySize->isIntegerConstantExpr(ConstVal, Context) || 625 (!T->isDependentType() && !T->isIncompleteType() && 626 !T->isConstantSizeType())) { 627 // Per C99, a variable array is an array with either a non-constant 628 // size or an element type that has a non-constant-size 629 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets); 630 } else { 631 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 632 // have a value greater than zero. 633 if (ConstVal.isSigned() && ConstVal.isNegative()) { 634 Diag(ArraySize->getLocStart(), 635 diag::err_typecheck_negative_array_size) 636 << ArraySize->getSourceRange(); 637 return QualType(); 638 } 639 if (ConstVal == 0) { 640 // GCC accepts zero sized static arrays. 641 Diag(ArraySize->getLocStart(), diag::ext_typecheck_zero_array_size) 642 << ArraySize->getSourceRange(); 643 } 644 T = Context.getConstantArrayType(T, ConstVal, ASM, Quals); 645 } 646 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 647 if (!getLangOptions().C99) { 648 if (ArraySize && !ArraySize->isTypeDependent() && 649 !ArraySize->isValueDependent() && 650 !ArraySize->isIntegerConstantExpr(Context)) 651 Diag(Loc, getLangOptions().CPlusPlus? diag::err_vla_cxx : diag::ext_vla); 652 else if (ASM != ArrayType::Normal || Quals != 0) 653 Diag(Loc, 654 getLangOptions().CPlusPlus? diag::err_c99_array_usage_cxx 655 : diag::ext_c99_array_usage); 656 } 657 658 return T; 659} 660 661/// \brief Build an ext-vector type. 662/// 663/// Run the required checks for the extended vector type. 664QualType Sema::BuildExtVectorType(QualType T, ExprArg ArraySize, 665 SourceLocation AttrLoc) { 666 667 Expr *Arg = (Expr *)ArraySize.get(); 668 669 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 670 // in conjunction with complex types (pointers, arrays, functions, etc.). 671 if (!T->isDependentType() && 672 !T->isIntegerType() && !T->isRealFloatingType()) { 673 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T; 674 return QualType(); 675 } 676 677 if (!Arg->isTypeDependent() && !Arg->isValueDependent()) { 678 llvm::APSInt vecSize(32); 679 if (!Arg->isIntegerConstantExpr(vecSize, Context)) { 680 Diag(AttrLoc, diag::err_attribute_argument_not_int) 681 << "ext_vector_type" << Arg->getSourceRange(); 682 return QualType(); 683 } 684 685 // unlike gcc's vector_size attribute, the size is specified as the 686 // number of elements, not the number of bytes. 687 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 688 689 if (vectorSize == 0) { 690 Diag(AttrLoc, diag::err_attribute_zero_size) 691 << Arg->getSourceRange(); 692 return QualType(); 693 } 694 695 if (!T->isDependentType()) 696 return Context.getExtVectorType(T, vectorSize); 697 } 698 699 return Context.getDependentSizedExtVectorType(T, ArraySize.takeAs<Expr>(), 700 AttrLoc); 701} 702 703/// \brief Build a function type. 704/// 705/// This routine checks the function type according to C++ rules and 706/// under the assumption that the result type and parameter types have 707/// just been instantiated from a template. It therefore duplicates 708/// some of the behavior of GetTypeForDeclarator, but in a much 709/// simpler form that is only suitable for this narrow use case. 710/// 711/// \param T The return type of the function. 712/// 713/// \param ParamTypes The parameter types of the function. This array 714/// will be modified to account for adjustments to the types of the 715/// function parameters. 716/// 717/// \param NumParamTypes The number of parameter types in ParamTypes. 718/// 719/// \param Variadic Whether this is a variadic function type. 720/// 721/// \param Quals The cvr-qualifiers to be applied to the function type. 722/// 723/// \param Loc The location of the entity whose type involves this 724/// function type or, if there is no such entity, the location of the 725/// type that will have function type. 726/// 727/// \param Entity The name of the entity that involves the function 728/// type, if known. 729/// 730/// \returns A suitable function type, if there are no 731/// errors. Otherwise, returns a NULL type. 732QualType Sema::BuildFunctionType(QualType T, 733 QualType *ParamTypes, 734 unsigned NumParamTypes, 735 bool Variadic, unsigned Quals, 736 SourceLocation Loc, DeclarationName Entity) { 737 if (T->isArrayType() || T->isFunctionType()) { 738 Diag(Loc, diag::err_func_returning_array_function) << T; 739 return QualType(); 740 } 741 742 bool Invalid = false; 743 for (unsigned Idx = 0; Idx < NumParamTypes; ++Idx) { 744 QualType ParamType = adjustParameterType(ParamTypes[Idx]); 745 if (ParamType->isVoidType()) { 746 Diag(Loc, diag::err_param_with_void_type); 747 Invalid = true; 748 } 749 750 ParamTypes[Idx] = ParamType; 751 } 752 753 if (Invalid) 754 return QualType(); 755 756 return Context.getFunctionType(T, ParamTypes, NumParamTypes, Variadic, 757 Quals); 758} 759 760/// \brief Build a member pointer type \c T Class::*. 761/// 762/// \param T the type to which the member pointer refers. 763/// \param Class the class type into which the member pointer points. 764/// \param CVR Qualifiers applied to the member pointer type 765/// \param Loc the location where this type begins 766/// \param Entity the name of the entity that will have this member pointer type 767/// 768/// \returns a member pointer type, if successful, or a NULL type if there was 769/// an error. 770QualType Sema::BuildMemberPointerType(QualType T, QualType Class, 771 unsigned CVR, SourceLocation Loc, 772 DeclarationName Entity) { 773 Qualifiers Quals = Qualifiers::fromCVRMask(CVR); 774 775 // Verify that we're not building a pointer to pointer to function with 776 // exception specification. 777 if (CheckDistantExceptionSpec(T)) { 778 Diag(Loc, diag::err_distant_exception_spec); 779 780 // FIXME: If we're doing this as part of template instantiation, 781 // we should return immediately. 782 783 // Build the type anyway, but use the canonical type so that the 784 // exception specifiers are stripped off. 785 T = Context.getCanonicalType(T); 786 } 787 788 // C++ 8.3.3p3: A pointer to member shall not pointer to ... a member 789 // with reference type, or "cv void." 790 if (T->isReferenceType()) { 791 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference) 792 << (Entity? Entity.getAsString() : "type name") << T; 793 return QualType(); 794 } 795 796 if (T->isVoidType()) { 797 Diag(Loc, diag::err_illegal_decl_mempointer_to_void) 798 << (Entity? Entity.getAsString() : "type name"); 799 return QualType(); 800 } 801 802 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 803 // object or incomplete types shall not be restrict-qualified." 804 if (Quals.hasRestrict() && !T->isIncompleteOrObjectType()) { 805 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 806 << T; 807 808 // FIXME: If we're doing this as part of template instantiation, 809 // we should return immediately. 810 Quals.removeRestrict(); 811 } 812 813 if (!Class->isDependentType() && !Class->isRecordType()) { 814 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class; 815 return QualType(); 816 } 817 818 return Context.getQualifiedType( 819 Context.getMemberPointerType(T, Class.getTypePtr()), Quals); 820} 821 822/// \brief Build a block pointer type. 823/// 824/// \param T The type to which we'll be building a block pointer. 825/// 826/// \param CVR The cvr-qualifiers to be applied to the block pointer type. 827/// 828/// \param Loc The location of the entity whose type involves this 829/// block pointer type or, if there is no such entity, the location of the 830/// type that will have block pointer type. 831/// 832/// \param Entity The name of the entity that involves the block pointer 833/// type, if known. 834/// 835/// \returns A suitable block pointer type, if there are no 836/// errors. Otherwise, returns a NULL type. 837QualType Sema::BuildBlockPointerType(QualType T, unsigned CVR, 838 SourceLocation Loc, 839 DeclarationName Entity) { 840 if (!T->isFunctionType()) { 841 Diag(Loc, diag::err_nonfunction_block_type); 842 return QualType(); 843 } 844 845 Qualifiers Quals = Qualifiers::fromCVRMask(CVR); 846 return Context.getQualifiedType(Context.getBlockPointerType(T), Quals); 847} 848 849QualType Sema::GetTypeFromParser(TypeTy *Ty, DeclaratorInfo **DInfo) { 850 QualType QT = QualType::getFromOpaquePtr(Ty); 851 if (QT.isNull()) { 852 if (DInfo) *DInfo = 0; 853 return QualType(); 854 } 855 856 DeclaratorInfo *DI = 0; 857 if (LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) { 858 QT = LIT->getType(); 859 DI = LIT->getDeclaratorInfo(); 860 } 861 862 if (DInfo) *DInfo = DI; 863 return QT; 864} 865 866/// GetTypeForDeclarator - Convert the type for the specified 867/// declarator to Type instances. 868/// 869/// If OwnedDecl is non-NULL, and this declarator's decl-specifier-seq 870/// owns the declaration of a type (e.g., the definition of a struct 871/// type), then *OwnedDecl will receive the owned declaration. 872QualType Sema::GetTypeForDeclarator(Declarator &D, Scope *S, 873 DeclaratorInfo **DInfo, 874 TagDecl **OwnedDecl) { 875 // Determine the type of the declarator. Not all forms of declarator 876 // have a type. 877 QualType T; 878 879 switch (D.getName().getKind()) { 880 case UnqualifiedId::IK_Identifier: 881 case UnqualifiedId::IK_OperatorFunctionId: 882 case UnqualifiedId::IK_TemplateId: 883 T = ConvertDeclSpecToType(D, *this); 884 885 if (!D.isInvalidType() && OwnedDecl && D.getDeclSpec().isTypeSpecOwned()) 886 *OwnedDecl = cast<TagDecl>((Decl *)D.getDeclSpec().getTypeRep()); 887 break; 888 889 case UnqualifiedId::IK_ConstructorName: 890 case UnqualifiedId::IK_DestructorName: 891 case UnqualifiedId::IK_ConversionFunctionId: 892 // Constructors and destructors don't have return types. Use 893 // "void" instead. Conversion operators will check their return 894 // types separately. 895 T = Context.VoidTy; 896 break; 897 } 898 899 if (T == Context.UndeducedAutoTy) { 900 int Error = -1; 901 902 switch (D.getContext()) { 903 case Declarator::KNRTypeListContext: 904 assert(0 && "K&R type lists aren't allowed in C++"); 905 break; 906 case Declarator::PrototypeContext: 907 Error = 0; // Function prototype 908 break; 909 case Declarator::MemberContext: 910 switch (cast<TagDecl>(CurContext)->getTagKind()) { 911 case TagDecl::TK_enum: assert(0 && "unhandled tag kind"); break; 912 case TagDecl::TK_struct: Error = 1; /* Struct member */ break; 913 case TagDecl::TK_union: Error = 2; /* Union member */ break; 914 case TagDecl::TK_class: Error = 3; /* Class member */ break; 915 } 916 break; 917 case Declarator::CXXCatchContext: 918 Error = 4; // Exception declaration 919 break; 920 case Declarator::TemplateParamContext: 921 Error = 5; // Template parameter 922 break; 923 case Declarator::BlockLiteralContext: 924 Error = 6; // Block literal 925 break; 926 case Declarator::FileContext: 927 case Declarator::BlockContext: 928 case Declarator::ForContext: 929 case Declarator::ConditionContext: 930 case Declarator::TypeNameContext: 931 break; 932 } 933 934 if (Error != -1) { 935 Diag(D.getDeclSpec().getTypeSpecTypeLoc(), diag::err_auto_not_allowed) 936 << Error; 937 T = Context.IntTy; 938 D.setInvalidType(true); 939 } 940 } 941 942 // The name we're declaring, if any. 943 DeclarationName Name; 944 if (D.getIdentifier()) 945 Name = D.getIdentifier(); 946 947 // Walk the DeclTypeInfo, building the recursive type as we go. 948 // DeclTypeInfos are ordered from the identifier out, which is 949 // opposite of what we want :). 950 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 951 DeclaratorChunk &DeclType = D.getTypeObject(e-i-1); 952 switch (DeclType.Kind) { 953 default: assert(0 && "Unknown decltype!"); 954 case DeclaratorChunk::BlockPointer: 955 // If blocks are disabled, emit an error. 956 if (!LangOpts.Blocks) 957 Diag(DeclType.Loc, diag::err_blocks_disable); 958 959 T = BuildBlockPointerType(T, DeclType.Cls.TypeQuals, D.getIdentifierLoc(), 960 Name); 961 break; 962 case DeclaratorChunk::Pointer: 963 // Verify that we're not building a pointer to pointer to function with 964 // exception specification. 965 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 966 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 967 D.setInvalidType(true); 968 // Build the type anyway. 969 } 970 if (getLangOptions().ObjC1 && T->isObjCInterfaceType()) { 971 const ObjCInterfaceType *OIT = T->getAs<ObjCInterfaceType>(); 972 T = Context.getObjCObjectPointerType(T, 973 (ObjCProtocolDecl **)OIT->qual_begin(), 974 OIT->getNumProtocols()); 975 break; 976 } 977 T = BuildPointerType(T, DeclType.Ptr.TypeQuals, DeclType.Loc, Name); 978 break; 979 case DeclaratorChunk::Reference: { 980 Qualifiers Quals; 981 if (DeclType.Ref.HasRestrict) Quals.addRestrict(); 982 983 // Verify that we're not building a reference to pointer to function with 984 // exception specification. 985 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 986 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 987 D.setInvalidType(true); 988 // Build the type anyway. 989 } 990 T = BuildReferenceType(T, DeclType.Ref.LValueRef, Quals, 991 DeclType.Loc, Name); 992 break; 993 } 994 case DeclaratorChunk::Array: { 995 // Verify that we're not building an array of pointers 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 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 1003 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 1004 ArrayType::ArraySizeModifier ASM; 1005 if (ATI.isStar) 1006 ASM = ArrayType::Star; 1007 else if (ATI.hasStatic) 1008 ASM = ArrayType::Static; 1009 else 1010 ASM = ArrayType::Normal; 1011 if (ASM == ArrayType::Star && 1012 D.getContext() != Declarator::PrototypeContext) { 1013 // FIXME: This check isn't quite right: it allows star in prototypes 1014 // for function definitions, and disallows some edge cases detailed 1015 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html 1016 Diag(DeclType.Loc, diag::err_array_star_outside_prototype); 1017 ASM = ArrayType::Normal; 1018 D.setInvalidType(true); 1019 } 1020 T = BuildArrayType(T, ASM, ArraySize, 1021 Qualifiers::fromCVRMask(ATI.TypeQuals), 1022 SourceRange(DeclType.Loc, DeclType.EndLoc), Name); 1023 break; 1024 } 1025 case DeclaratorChunk::Function: { 1026 // If the function declarator has a prototype (i.e. it is not () and 1027 // does not have a K&R-style identifier list), then the arguments are part 1028 // of the type, otherwise the argument list is (). 1029 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 1030 1031 // C99 6.7.5.3p1: The return type may not be a function or array type. 1032 if (T->isArrayType() || T->isFunctionType()) { 1033 Diag(DeclType.Loc, diag::err_func_returning_array_function) << T; 1034 T = Context.IntTy; 1035 D.setInvalidType(true); 1036 } 1037 1038 if (getLangOptions().CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) { 1039 // C++ [dcl.fct]p6: 1040 // Types shall not be defined in return or parameter types. 1041 TagDecl *Tag = cast<TagDecl>((Decl *)D.getDeclSpec().getTypeRep()); 1042 if (Tag->isDefinition()) 1043 Diag(Tag->getLocation(), diag::err_type_defined_in_result_type) 1044 << Context.getTypeDeclType(Tag); 1045 } 1046 1047 // Exception specs are not allowed in typedefs. Complain, but add it 1048 // anyway. 1049 if (FTI.hasExceptionSpec && 1050 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1051 Diag(FTI.getThrowLoc(), diag::err_exception_spec_in_typedef); 1052 1053 if (FTI.NumArgs == 0) { 1054 if (getLangOptions().CPlusPlus) { 1055 // C++ 8.3.5p2: If the parameter-declaration-clause is empty, the 1056 // function takes no arguments. 1057 llvm::SmallVector<QualType, 4> Exceptions; 1058 Exceptions.reserve(FTI.NumExceptions); 1059 for (unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) { 1060 // FIXME: Preserve type source info. 1061 QualType ET = GetTypeFromParser(FTI.Exceptions[ei].Ty); 1062 // Check that the type is valid for an exception spec, and drop it 1063 // if not. 1064 if (!CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range)) 1065 Exceptions.push_back(ET); 1066 } 1067 T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic, FTI.TypeQuals, 1068 FTI.hasExceptionSpec, 1069 FTI.hasAnyExceptionSpec, 1070 Exceptions.size(), Exceptions.data()); 1071 } else if (FTI.isVariadic) { 1072 // We allow a zero-parameter variadic function in C if the 1073 // function is marked with the "overloadable" 1074 // attribute. Scan for this attribute now. 1075 bool Overloadable = false; 1076 for (const AttributeList *Attrs = D.getAttributes(); 1077 Attrs; Attrs = Attrs->getNext()) { 1078 if (Attrs->getKind() == AttributeList::AT_overloadable) { 1079 Overloadable = true; 1080 break; 1081 } 1082 } 1083 1084 if (!Overloadable) 1085 Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); 1086 T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic, 0); 1087 } else { 1088 // Simple void foo(), where the incoming T is the result type. 1089 T = Context.getFunctionNoProtoType(T); 1090 } 1091 } else if (FTI.ArgInfo[0].Param == 0) { 1092 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function definition. 1093 Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 1094 D.setInvalidType(true); 1095 } else { 1096 // Otherwise, we have a function with an argument list that is 1097 // potentially variadic. 1098 llvm::SmallVector<QualType, 16> ArgTys; 1099 1100 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 1101 ParmVarDecl *Param = 1102 cast<ParmVarDecl>(FTI.ArgInfo[i].Param.getAs<Decl>()); 1103 QualType ArgTy = Param->getType(); 1104 assert(!ArgTy.isNull() && "Couldn't parse type?"); 1105 1106 // Adjust the parameter type. 1107 assert((ArgTy == adjustParameterType(ArgTy)) && "Unadjusted type?"); 1108 1109 // Look for 'void'. void is allowed only as a single argument to a 1110 // function with no other parameters (C99 6.7.5.3p10). We record 1111 // int(void) as a FunctionProtoType with an empty argument list. 1112 if (ArgTy->isVoidType()) { 1113 // If this is something like 'float(int, void)', reject it. 'void' 1114 // is an incomplete type (C99 6.2.5p19) and function decls cannot 1115 // have arguments of incomplete type. 1116 if (FTI.NumArgs != 1 || FTI.isVariadic) { 1117 Diag(DeclType.Loc, diag::err_void_only_param); 1118 ArgTy = Context.IntTy; 1119 Param->setType(ArgTy); 1120 } else if (FTI.ArgInfo[i].Ident) { 1121 // Reject, but continue to parse 'int(void abc)'. 1122 Diag(FTI.ArgInfo[i].IdentLoc, 1123 diag::err_param_with_void_type); 1124 ArgTy = Context.IntTy; 1125 Param->setType(ArgTy); 1126 } else { 1127 // Reject, but continue to parse 'float(const void)'. 1128 if (ArgTy.hasQualifiers()) 1129 Diag(DeclType.Loc, diag::err_void_param_qualified); 1130 1131 // Do not add 'void' to the ArgTys list. 1132 break; 1133 } 1134 } else if (!FTI.hasPrototype) { 1135 if (ArgTy->isPromotableIntegerType()) { 1136 ArgTy = Context.getPromotedIntegerType(ArgTy); 1137 } else if (const BuiltinType* BTy = ArgTy->getAs<BuiltinType>()) { 1138 if (BTy->getKind() == BuiltinType::Float) 1139 ArgTy = Context.DoubleTy; 1140 } 1141 } 1142 1143 ArgTys.push_back(ArgTy); 1144 } 1145 1146 llvm::SmallVector<QualType, 4> Exceptions; 1147 Exceptions.reserve(FTI.NumExceptions); 1148 for (unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) { 1149 // FIXME: Preserve type source info. 1150 QualType ET = GetTypeFromParser(FTI.Exceptions[ei].Ty); 1151 // Check that the type is valid for an exception spec, and drop it if 1152 // not. 1153 if (!CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range)) 1154 Exceptions.push_back(ET); 1155 } 1156 1157 T = Context.getFunctionType(T, ArgTys.data(), ArgTys.size(), 1158 FTI.isVariadic, FTI.TypeQuals, 1159 FTI.hasExceptionSpec, 1160 FTI.hasAnyExceptionSpec, 1161 Exceptions.size(), Exceptions.data()); 1162 } 1163 break; 1164 } 1165 case DeclaratorChunk::MemberPointer: 1166 // Verify that we're not building a pointer to pointer to function with 1167 // exception specification. 1168 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 1169 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 1170 D.setInvalidType(true); 1171 // Build the type anyway. 1172 } 1173 // The scope spec must refer to a class, or be dependent. 1174 QualType ClsType; 1175 if (isDependentScopeSpecifier(DeclType.Mem.Scope()) 1176 || dyn_cast_or_null<CXXRecordDecl>( 1177 computeDeclContext(DeclType.Mem.Scope()))) { 1178 NestedNameSpecifier *NNS 1179 = (NestedNameSpecifier *)DeclType.Mem.Scope().getScopeRep(); 1180 NestedNameSpecifier *NNSPrefix = NNS->getPrefix(); 1181 switch (NNS->getKind()) { 1182 case NestedNameSpecifier::Identifier: 1183 ClsType = Context.getTypenameType(NNSPrefix, NNS->getAsIdentifier()); 1184 break; 1185 1186 case NestedNameSpecifier::Namespace: 1187 case NestedNameSpecifier::Global: 1188 llvm::llvm_unreachable("Nested-name-specifier must name a type"); 1189 break; 1190 1191 case NestedNameSpecifier::TypeSpec: 1192 case NestedNameSpecifier::TypeSpecWithTemplate: 1193 ClsType = QualType(NNS->getAsType(), 0); 1194 if (NNSPrefix) 1195 ClsType = Context.getQualifiedNameType(NNSPrefix, ClsType); 1196 break; 1197 } 1198 } else { 1199 Diag(DeclType.Mem.Scope().getBeginLoc(), 1200 diag::err_illegal_decl_mempointer_in_nonclass) 1201 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 1202 << DeclType.Mem.Scope().getRange(); 1203 D.setInvalidType(true); 1204 } 1205 1206 if (!ClsType.isNull()) 1207 T = BuildMemberPointerType(T, ClsType, DeclType.Mem.TypeQuals, 1208 DeclType.Loc, D.getIdentifier()); 1209 if (T.isNull()) { 1210 T = Context.IntTy; 1211 D.setInvalidType(true); 1212 } 1213 break; 1214 } 1215 1216 if (T.isNull()) { 1217 D.setInvalidType(true); 1218 T = Context.IntTy; 1219 } 1220 1221 // See if there are any attributes on this declarator chunk. 1222 if (const AttributeList *AL = DeclType.getAttrs()) 1223 ProcessTypeAttributeList(T, AL); 1224 } 1225 1226 if (getLangOptions().CPlusPlus && T->isFunctionType()) { 1227 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>(); 1228 assert(FnTy && "Why oh why is there not a FunctionProtoType here?"); 1229 1230 // C++ 8.3.5p4: A cv-qualifier-seq shall only be part of the function type 1231 // for a nonstatic member function, the function type to which a pointer 1232 // to member refers, or the top-level function type of a function typedef 1233 // declaration. 1234 if (FnTy->getTypeQuals() != 0 && 1235 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 1236 ((D.getContext() != Declarator::MemberContext && 1237 (!D.getCXXScopeSpec().isSet() || 1238 !computeDeclContext(D.getCXXScopeSpec(), /*FIXME:*/true) 1239 ->isRecord())) || 1240 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static)) { 1241 if (D.isFunctionDeclarator()) 1242 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_function_type); 1243 else 1244 Diag(D.getIdentifierLoc(), 1245 diag::err_invalid_qualified_typedef_function_type_use); 1246 1247 // Strip the cv-quals from the type. 1248 T = Context.getFunctionType(FnTy->getResultType(), FnTy->arg_type_begin(), 1249 FnTy->getNumArgs(), FnTy->isVariadic(), 0); 1250 } 1251 } 1252 1253 // If there were any type attributes applied to the decl itself (not the 1254 // type, apply the type attribute to the type!) 1255 if (const AttributeList *Attrs = D.getAttributes()) 1256 ProcessTypeAttributeList(T, Attrs); 1257 1258 if (DInfo) { 1259 if (D.isInvalidType()) 1260 *DInfo = 0; 1261 else 1262 *DInfo = GetDeclaratorInfoForDeclarator(D, T); 1263 } 1264 1265 return T; 1266} 1267 1268namespace { 1269 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> { 1270 const DeclSpec &DS; 1271 1272 public: 1273 TypeSpecLocFiller(const DeclSpec &DS) : DS(DS) {} 1274 1275 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 1276 Visit(TL.getUnqualifiedLoc()); 1277 } 1278 void VisitTypedefTypeLoc(TypedefTypeLoc TL) { 1279 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 1280 } 1281 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) { 1282 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 1283 1284 if (DS.getProtocolQualifiers()) { 1285 assert(TL.getNumProtocols() > 0); 1286 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 1287 TL.setLAngleLoc(DS.getProtocolLAngleLoc()); 1288 TL.setRAngleLoc(DS.getSourceRange().getEnd()); 1289 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i) 1290 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]); 1291 } else { 1292 assert(TL.getNumProtocols() == 0); 1293 TL.setLAngleLoc(SourceLocation()); 1294 TL.setRAngleLoc(SourceLocation()); 1295 } 1296 } 1297 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 1298 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 1299 1300 TL.setStarLoc(SourceLocation()); 1301 1302 if (DS.getProtocolQualifiers()) { 1303 assert(TL.getNumProtocols() > 0); 1304 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 1305 TL.setHasProtocolsAsWritten(true); 1306 TL.setLAngleLoc(DS.getProtocolLAngleLoc()); 1307 TL.setRAngleLoc(DS.getSourceRange().getEnd()); 1308 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i) 1309 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]); 1310 1311 } else { 1312 assert(TL.getNumProtocols() == 0); 1313 TL.setHasProtocolsAsWritten(false); 1314 TL.setLAngleLoc(SourceLocation()); 1315 TL.setRAngleLoc(SourceLocation()); 1316 } 1317 1318 // This might not have been written with an inner type. 1319 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) { 1320 TL.setHasBaseTypeAsWritten(false); 1321 TL.getBaseTypeLoc().initialize(SourceLocation()); 1322 } else { 1323 TL.setHasBaseTypeAsWritten(true); 1324 Visit(TL.getBaseTypeLoc()); 1325 } 1326 } 1327 void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) { 1328 DeclaratorInfo *DInfo = 0; 1329 Sema::GetTypeFromParser(DS.getTypeRep(), &DInfo); 1330 1331 // If we got no declarator info from previous Sema routines, 1332 // just fill with the typespec loc. 1333 if (!DInfo) { 1334 TL.initialize(DS.getTypeSpecTypeLoc()); 1335 return; 1336 } 1337 1338 TemplateSpecializationTypeLoc OldTL = 1339 cast<TemplateSpecializationTypeLoc>(DInfo->getTypeLoc()); 1340 TL.copy(OldTL); 1341 } 1342 void VisitTypeLoc(TypeLoc TL) { 1343 // FIXME: add other typespec types and change this to an assert. 1344 TL.initialize(DS.getTypeSpecTypeLoc()); 1345 } 1346 }; 1347 1348 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> { 1349 const DeclaratorChunk &Chunk; 1350 1351 public: 1352 DeclaratorLocFiller(const DeclaratorChunk &Chunk) : Chunk(Chunk) {} 1353 1354 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 1355 llvm::llvm_unreachable("qualified type locs not expected here!"); 1356 } 1357 1358 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) { 1359 assert(Chunk.Kind == DeclaratorChunk::BlockPointer); 1360 TL.setCaretLoc(Chunk.Loc); 1361 } 1362 void VisitPointerTypeLoc(PointerTypeLoc TL) { 1363 assert(Chunk.Kind == DeclaratorChunk::Pointer); 1364 TL.setStarLoc(Chunk.Loc); 1365 } 1366 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 1367 assert(Chunk.Kind == DeclaratorChunk::Pointer); 1368 TL.setStarLoc(Chunk.Loc); 1369 TL.setHasBaseTypeAsWritten(true); 1370 TL.setHasProtocolsAsWritten(false); 1371 TL.setLAngleLoc(SourceLocation()); 1372 TL.setRAngleLoc(SourceLocation()); 1373 } 1374 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) { 1375 assert(Chunk.Kind == DeclaratorChunk::MemberPointer); 1376 TL.setStarLoc(Chunk.Loc); 1377 // FIXME: nested name specifier 1378 } 1379 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) { 1380 assert(Chunk.Kind == DeclaratorChunk::Reference); 1381 // 'Amp' is misleading: this might have been originally 1382 /// spelled with AmpAmp. 1383 TL.setAmpLoc(Chunk.Loc); 1384 } 1385 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) { 1386 assert(Chunk.Kind == DeclaratorChunk::Reference); 1387 assert(!Chunk.Ref.LValueRef); 1388 TL.setAmpAmpLoc(Chunk.Loc); 1389 } 1390 void VisitArrayTypeLoc(ArrayTypeLoc TL) { 1391 assert(Chunk.Kind == DeclaratorChunk::Array); 1392 TL.setLBracketLoc(Chunk.Loc); 1393 TL.setRBracketLoc(Chunk.EndLoc); 1394 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts)); 1395 } 1396 void VisitFunctionTypeLoc(FunctionTypeLoc TL) { 1397 assert(Chunk.Kind == DeclaratorChunk::Function); 1398 TL.setLParenLoc(Chunk.Loc); 1399 TL.setRParenLoc(Chunk.EndLoc); 1400 1401 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun; 1402 for (unsigned i = 0, e = TL.getNumArgs(), tpi = 0; i != e; ++i) { 1403 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 1404 TL.setArg(tpi++, Param); 1405 } 1406 // FIXME: exception specs 1407 } 1408 1409 void VisitTypeLoc(TypeLoc TL) { 1410 llvm::llvm_unreachable("unsupported TypeLoc kind in declarator!"); 1411 } 1412 }; 1413} 1414 1415/// \brief Create and instantiate a DeclaratorInfo with type source information. 1416/// 1417/// \param T QualType referring to the type as written in source code. 1418DeclaratorInfo * 1419Sema::GetDeclaratorInfoForDeclarator(Declarator &D, QualType T) { 1420 DeclaratorInfo *DInfo = Context.CreateDeclaratorInfo(T); 1421 UnqualTypeLoc CurrTL = DInfo->getTypeLoc().getUnqualifiedLoc(); 1422 1423 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 1424 DeclaratorLocFiller(D.getTypeObject(i)).Visit(CurrTL); 1425 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 1426 } 1427 1428 TypeSpecLocFiller(D.getDeclSpec()).Visit(CurrTL); 1429 1430 return DInfo; 1431} 1432 1433/// \brief Create a LocInfoType to hold the given QualType and DeclaratorInfo. 1434QualType Sema::CreateLocInfoType(QualType T, DeclaratorInfo *DInfo) { 1435 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser 1436 // and Sema during declaration parsing. Try deallocating/caching them when 1437 // it's appropriate, instead of allocating them and keeping them around. 1438 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType), 8); 1439 new (LocT) LocInfoType(T, DInfo); 1440 assert(LocT->getTypeClass() != T->getTypeClass() && 1441 "LocInfoType's TypeClass conflicts with an existing Type class"); 1442 return QualType(LocT, 0); 1443} 1444 1445void LocInfoType::getAsStringInternal(std::string &Str, 1446 const PrintingPolicy &Policy) const { 1447 assert(false && "LocInfoType leaked into the type system; an opaque TypeTy*" 1448 " was used directly instead of getting the QualType through" 1449 " GetTypeFromParser"); 1450} 1451 1452/// ObjCGetTypeForMethodDefinition - Builds the type for a method definition 1453/// declarator 1454QualType Sema::ObjCGetTypeForMethodDefinition(DeclPtrTy D) { 1455 ObjCMethodDecl *MDecl = cast<ObjCMethodDecl>(D.getAs<Decl>()); 1456 QualType T = MDecl->getResultType(); 1457 llvm::SmallVector<QualType, 16> ArgTys; 1458 1459 // Add the first two invisible argument types for self and _cmd. 1460 if (MDecl->isInstanceMethod()) { 1461 QualType selfTy = Context.getObjCInterfaceType(MDecl->getClassInterface()); 1462 selfTy = Context.getPointerType(selfTy); 1463 ArgTys.push_back(selfTy); 1464 } else 1465 ArgTys.push_back(Context.getObjCIdType()); 1466 ArgTys.push_back(Context.getObjCSelType()); 1467 1468 for (ObjCMethodDecl::param_iterator PI = MDecl->param_begin(), 1469 E = MDecl->param_end(); PI != E; ++PI) { 1470 QualType ArgTy = (*PI)->getType(); 1471 assert(!ArgTy.isNull() && "Couldn't parse type?"); 1472 ArgTy = adjustParameterType(ArgTy); 1473 ArgTys.push_back(ArgTy); 1474 } 1475 T = Context.getFunctionType(T, &ArgTys[0], ArgTys.size(), 1476 MDecl->isVariadic(), 0); 1477 return T; 1478} 1479 1480/// UnwrapSimilarPointerTypes - If T1 and T2 are pointer types that 1481/// may be similar (C++ 4.4), replaces T1 and T2 with the type that 1482/// they point to and return true. If T1 and T2 aren't pointer types 1483/// or pointer-to-member types, or if they are not similar at this 1484/// level, returns false and leaves T1 and T2 unchanged. Top-level 1485/// qualifiers on T1 and T2 are ignored. This function will typically 1486/// be called in a loop that successively "unwraps" pointer and 1487/// pointer-to-member types to compare them at each level. 1488bool Sema::UnwrapSimilarPointerTypes(QualType& T1, QualType& T2) { 1489 const PointerType *T1PtrType = T1->getAs<PointerType>(), 1490 *T2PtrType = T2->getAs<PointerType>(); 1491 if (T1PtrType && T2PtrType) { 1492 T1 = T1PtrType->getPointeeType(); 1493 T2 = T2PtrType->getPointeeType(); 1494 return true; 1495 } 1496 1497 const MemberPointerType *T1MPType = T1->getAs<MemberPointerType>(), 1498 *T2MPType = T2->getAs<MemberPointerType>(); 1499 if (T1MPType && T2MPType && 1500 Context.getCanonicalType(T1MPType->getClass()) == 1501 Context.getCanonicalType(T2MPType->getClass())) { 1502 T1 = T1MPType->getPointeeType(); 1503 T2 = T2MPType->getPointeeType(); 1504 return true; 1505 } 1506 return false; 1507} 1508 1509Sema::TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 1510 // C99 6.7.6: Type names have no identifier. This is already validated by 1511 // the parser. 1512 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 1513 1514 DeclaratorInfo *DInfo = 0; 1515 TagDecl *OwnedTag = 0; 1516 QualType T = GetTypeForDeclarator(D, S, &DInfo, &OwnedTag); 1517 if (D.isInvalidType()) 1518 return true; 1519 1520 if (getLangOptions().CPlusPlus) { 1521 // Check that there are no default arguments (C++ only). 1522 CheckExtraCXXDefaultArguments(D); 1523 1524 // C++0x [dcl.type]p3: 1525 // A type-specifier-seq shall not define a class or enumeration 1526 // unless it appears in the type-id of an alias-declaration 1527 // (7.1.3). 1528 if (OwnedTag && OwnedTag->isDefinition()) 1529 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_type_specifier) 1530 << Context.getTypeDeclType(OwnedTag); 1531 } 1532 1533 if (DInfo) 1534 T = CreateLocInfoType(T, DInfo); 1535 1536 return T.getAsOpaquePtr(); 1537} 1538 1539 1540 1541//===----------------------------------------------------------------------===// 1542// Type Attribute Processing 1543//===----------------------------------------------------------------------===// 1544 1545/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 1546/// specified type. The attribute contains 1 argument, the id of the address 1547/// space for the type. 1548static void HandleAddressSpaceTypeAttribute(QualType &Type, 1549 const AttributeList &Attr, Sema &S){ 1550 1551 // If this type is already address space qualified, reject it. 1552 // Clause 6.7.3 - Type qualifiers: "No type shall be qualified by qualifiers 1553 // for two or more different address spaces." 1554 if (Type.getAddressSpace()) { 1555 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 1556 return; 1557 } 1558 1559 // Check the attribute arguments. 1560 if (Attr.getNumArgs() != 1) { 1561 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1562 return; 1563 } 1564 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 1565 llvm::APSInt addrSpace(32); 1566 if (!ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 1567 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 1568 << ASArgExpr->getSourceRange(); 1569 return; 1570 } 1571 1572 // Bounds checking. 1573 if (addrSpace.isSigned()) { 1574 if (addrSpace.isNegative()) { 1575 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative) 1576 << ASArgExpr->getSourceRange(); 1577 return; 1578 } 1579 addrSpace.setIsSigned(false); 1580 } 1581 llvm::APSInt max(addrSpace.getBitWidth()); 1582 max = Qualifiers::MaxAddressSpace; 1583 if (addrSpace > max) { 1584 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high) 1585 << Qualifiers::MaxAddressSpace << ASArgExpr->getSourceRange(); 1586 return; 1587 } 1588 1589 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 1590 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 1591} 1592 1593/// HandleObjCGCTypeAttribute - Process an objc's gc attribute on the 1594/// specified type. The attribute contains 1 argument, weak or strong. 1595static void HandleObjCGCTypeAttribute(QualType &Type, 1596 const AttributeList &Attr, Sema &S) { 1597 if (Type.getObjCGCAttr() != Qualifiers::GCNone) { 1598 S.Diag(Attr.getLoc(), diag::err_attribute_multiple_objc_gc); 1599 return; 1600 } 1601 1602 // Check the attribute arguments. 1603 if (!Attr.getParameterName()) { 1604 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) 1605 << "objc_gc" << 1; 1606 return; 1607 } 1608 Qualifiers::GC GCAttr; 1609 if (Attr.getNumArgs() != 0) { 1610 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1611 return; 1612 } 1613 if (Attr.getParameterName()->isStr("weak")) 1614 GCAttr = Qualifiers::Weak; 1615 else if (Attr.getParameterName()->isStr("strong")) 1616 GCAttr = Qualifiers::Strong; 1617 else { 1618 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported) 1619 << "objc_gc" << Attr.getParameterName(); 1620 return; 1621 } 1622 1623 Type = S.Context.getObjCGCQualType(Type, GCAttr); 1624} 1625 1626/// HandleNoReturnTypeAttribute - Process the noreturn attribute on the 1627/// specified type. The attribute contains 0 arguments. 1628static void HandleNoReturnTypeAttribute(QualType &Type, 1629 const AttributeList &Attr, Sema &S) { 1630 if (Attr.getNumArgs() != 0) 1631 return; 1632 1633 // We only apply this to a pointer to function or a pointer to block. 1634 if (!Type->isFunctionPointerType() 1635 && !Type->isBlockPointerType() 1636 && !Type->isFunctionType()) 1637 return; 1638 1639 Type = S.Context.getNoReturnType(Type); 1640} 1641 1642void Sema::ProcessTypeAttributeList(QualType &Result, const AttributeList *AL) { 1643 // Scan through and apply attributes to this type where it makes sense. Some 1644 // attributes (such as __address_space__, __vector_size__, etc) apply to the 1645 // type, but others can be present in the type specifiers even though they 1646 // apply to the decl. Here we apply type attributes and ignore the rest. 1647 for (; AL; AL = AL->getNext()) { 1648 // If this is an attribute we can handle, do so now, otherwise, add it to 1649 // the LeftOverAttrs list for rechaining. 1650 switch (AL->getKind()) { 1651 default: break; 1652 case AttributeList::AT_address_space: 1653 HandleAddressSpaceTypeAttribute(Result, *AL, *this); 1654 break; 1655 case AttributeList::AT_objc_gc: 1656 HandleObjCGCTypeAttribute(Result, *AL, *this); 1657 break; 1658 case AttributeList::AT_noreturn: 1659 HandleNoReturnTypeAttribute(Result, *AL, *this); 1660 break; 1661 } 1662 } 1663} 1664 1665/// @brief Ensure that the type T is a complete type. 1666/// 1667/// This routine checks whether the type @p T is complete in any 1668/// context where a complete type is required. If @p T is a complete 1669/// type, returns false. If @p T is a class template specialization, 1670/// this routine then attempts to perform class template 1671/// instantiation. If instantiation fails, or if @p T is incomplete 1672/// and cannot be completed, issues the diagnostic @p diag (giving it 1673/// the type @p T) and returns true. 1674/// 1675/// @param Loc The location in the source that the incomplete type 1676/// diagnostic should refer to. 1677/// 1678/// @param T The type that this routine is examining for completeness. 1679/// 1680/// @param PD The partial diagnostic that will be printed out if T is not a 1681/// complete type. 1682/// 1683/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 1684/// @c false otherwise. 1685bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 1686 const PartialDiagnostic &PD, 1687 std::pair<SourceLocation, 1688 PartialDiagnostic> Note) { 1689 unsigned diag = PD.getDiagID(); 1690 1691 // FIXME: Add this assertion to make sure we always get instantiation points. 1692 // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType"); 1693 // FIXME: Add this assertion to help us flush out problems with 1694 // checking for dependent types and type-dependent expressions. 1695 // 1696 // assert(!T->isDependentType() && 1697 // "Can't ask whether a dependent type is complete"); 1698 1699 // If we have a complete type, we're done. 1700 if (!T->isIncompleteType()) 1701 return false; 1702 1703 // If we have a class template specialization or a class member of a 1704 // class template specialization, or an array with known size of such, 1705 // try to instantiate it. 1706 QualType MaybeTemplate = T; 1707 if (const ConstantArrayType *Array = Context.getAsConstantArrayType(T)) 1708 MaybeTemplate = Array->getElementType(); 1709 if (const RecordType *Record = MaybeTemplate->getAs<RecordType>()) { 1710 if (ClassTemplateSpecializationDecl *ClassTemplateSpec 1711 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { 1712 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) 1713 return InstantiateClassTemplateSpecialization(Loc, ClassTemplateSpec, 1714 TSK_ImplicitInstantiation, 1715 /*Complain=*/diag != 0); 1716 } else if (CXXRecordDecl *Rec 1717 = dyn_cast<CXXRecordDecl>(Record->getDecl())) { 1718 if (CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass()) { 1719 MemberSpecializationInfo *MSInfo = Rec->getMemberSpecializationInfo(); 1720 assert(MSInfo && "Missing member specialization information?"); 1721 // This record was instantiated from a class within a template. 1722 if (MSInfo->getTemplateSpecializationKind() 1723 != TSK_ExplicitSpecialization) 1724 return InstantiateClass(Loc, Rec, Pattern, 1725 getTemplateInstantiationArgs(Rec), 1726 TSK_ImplicitInstantiation, 1727 /*Complain=*/diag != 0); 1728 } 1729 } 1730 } 1731 1732 if (diag == 0) 1733 return true; 1734 1735 // We have an incomplete type. Produce a diagnostic. 1736 Diag(Loc, PD) << T; 1737 1738 // If we have a note, produce it. 1739 if (!Note.first.isInvalid()) 1740 Diag(Note.first, Note.second); 1741 1742 // If the type was a forward declaration of a class/struct/union 1743 // type, produce 1744 const TagType *Tag = 0; 1745 if (const RecordType *Record = T->getAs<RecordType>()) 1746 Tag = Record; 1747 else if (const EnumType *Enum = T->getAs<EnumType>()) 1748 Tag = Enum; 1749 1750 if (Tag && !Tag->getDecl()->isInvalidDecl()) 1751 Diag(Tag->getDecl()->getLocation(), 1752 Tag->isBeingDefined() ? diag::note_type_being_defined 1753 : diag::note_forward_declaration) 1754 << QualType(Tag, 0); 1755 1756 return true; 1757} 1758 1759/// \brief Retrieve a version of the type 'T' that is qualified by the 1760/// nested-name-specifier contained in SS. 1761QualType Sema::getQualifiedNameType(const CXXScopeSpec &SS, QualType T) { 1762 if (!SS.isSet() || SS.isInvalid() || T.isNull()) 1763 return T; 1764 1765 NestedNameSpecifier *NNS 1766 = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 1767 return Context.getQualifiedNameType(NNS, T); 1768} 1769 1770QualType Sema::BuildTypeofExprType(Expr *E) { 1771 return Context.getTypeOfExprType(E); 1772} 1773 1774QualType Sema::BuildDecltypeType(Expr *E) { 1775 if (E->getType() == Context.OverloadTy) { 1776 Diag(E->getLocStart(), 1777 diag::err_cannot_determine_declared_type_of_overloaded_function); 1778 return QualType(); 1779 } 1780 return Context.getDecltypeType(E); 1781} 1782