SemaType.cpp revision 923d56d436f750bc1f29db50e641078725558a1b
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 = cast_or_null<TypeDecl>(static_cast<Decl *>(DS.getTypeRep())); 233 if (!D) { 234 // This can happen in C++ with ambiguous lookups. 235 Result = Context.IntTy; 236 TheDeclarator.setInvalidType(true); 237 break; 238 } 239 240 // If the type is deprecated or unavailable, diagnose it. 241 TheSema.DiagnoseUseOfDecl(D, DS.getTypeSpecTypeLoc()); 242 243 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 244 DS.getTypeSpecSign() == 0 && "No qualifiers on tag names!"); 245 246 // TypeQuals handled by caller. 247 Result = Context.getTypeDeclType(D); 248 249 // In C++, make an ElaboratedType. 250 if (TheSema.getLangOptions().CPlusPlus) { 251 TagDecl::TagKind Tag 252 = TagDecl::getTagKindForTypeSpec(DS.getTypeSpecType()); 253 Result = Context.getElaboratedType(Result, Tag); 254 } 255 256 if (D->isInvalidDecl()) 257 TheDeclarator.setInvalidType(true); 258 break; 259 } 260 case DeclSpec::TST_typename: { 261 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 262 DS.getTypeSpecSign() == 0 && 263 "Can't handle qualifiers on typedef names yet!"); 264 Result = TheSema.GetTypeFromParser(DS.getTypeRep()); 265 266 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 267 if (const ObjCInterfaceType * 268 Interface = Result->getAs<ObjCInterfaceType>()) { 269 // It would be nice if protocol qualifiers were only stored with the 270 // ObjCObjectPointerType. Unfortunately, this isn't possible due 271 // to the following typedef idiom (which is uncommon, but allowed): 272 // 273 // typedef Foo<P> T; 274 // static void func() { 275 // Foo<P> *yy; 276 // T *zz; 277 // } 278 Result = Context.getObjCInterfaceType(Interface->getDecl(), 279 (ObjCProtocolDecl**)PQ, 280 DS.getNumProtocolQualifiers()); 281 } else if (Result->isObjCIdType()) 282 // id<protocol-list> 283 Result = Context.getObjCObjectPointerType(Context.ObjCBuiltinIdTy, 284 (ObjCProtocolDecl**)PQ, DS.getNumProtocolQualifiers()); 285 else if (Result->isObjCClassType()) { 286 // Class<protocol-list> 287 Result = Context.getObjCObjectPointerType(Context.ObjCBuiltinClassTy, 288 (ObjCProtocolDecl**)PQ, DS.getNumProtocolQualifiers()); 289 } else { 290 TheSema.Diag(DeclLoc, diag::err_invalid_protocol_qualifiers) 291 << DS.getSourceRange(); 292 TheDeclarator.setInvalidType(true); 293 } 294 } 295 296 // TypeQuals handled by caller. 297 break; 298 } 299 case DeclSpec::TST_typeofType: 300 // FIXME: Preserve type source info. 301 Result = TheSema.GetTypeFromParser(DS.getTypeRep()); 302 assert(!Result.isNull() && "Didn't get a type for typeof?"); 303 // TypeQuals handled by caller. 304 Result = Context.getTypeOfType(Result); 305 break; 306 case DeclSpec::TST_typeofExpr: { 307 Expr *E = static_cast<Expr *>(DS.getTypeRep()); 308 assert(E && "Didn't get an expression for typeof?"); 309 // TypeQuals handled by caller. 310 Result = Context.getTypeOfExprType(E); 311 break; 312 } 313 case DeclSpec::TST_decltype: { 314 Expr *E = static_cast<Expr *>(DS.getTypeRep()); 315 assert(E && "Didn't get an expression for decltype?"); 316 // TypeQuals handled by caller. 317 Result = TheSema.BuildDecltypeType(E); 318 if (Result.isNull()) { 319 Result = Context.IntTy; 320 TheDeclarator.setInvalidType(true); 321 } 322 break; 323 } 324 case DeclSpec::TST_auto: { 325 // TypeQuals handled by caller. 326 Result = Context.UndeducedAutoTy; 327 break; 328 } 329 330 case DeclSpec::TST_error: 331 Result = Context.IntTy; 332 TheDeclarator.setInvalidType(true); 333 break; 334 } 335 336 // Handle complex types. 337 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) { 338 if (TheSema.getLangOptions().Freestanding) 339 TheSema.Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex); 340 Result = Context.getComplexType(Result); 341 } 342 343 assert(DS.getTypeSpecComplex() != DeclSpec::TSC_imaginary && 344 "FIXME: imaginary types not supported yet!"); 345 346 // See if there are any attributes on the declspec that apply to the type (as 347 // opposed to the decl). 348 if (const AttributeList *AL = DS.getAttributes()) 349 TheSema.ProcessTypeAttributeList(Result, AL); 350 351 // Apply const/volatile/restrict qualifiers to T. 352 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 353 354 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 355 // or incomplete types shall not be restrict-qualified." C++ also allows 356 // restrict-qualified references. 357 if (TypeQuals & DeclSpec::TQ_restrict) { 358 if (Result->isPointerType() || Result->isReferenceType()) { 359 QualType EltTy = Result->isPointerType() ? 360 Result->getAs<PointerType>()->getPointeeType() : 361 Result->getAs<ReferenceType>()->getPointeeType(); 362 363 // If we have a pointer or reference, the pointee must have an object 364 // incomplete type. 365 if (!EltTy->isIncompleteOrObjectType()) { 366 TheSema.Diag(DS.getRestrictSpecLoc(), 367 diag::err_typecheck_invalid_restrict_invalid_pointee) 368 << EltTy << DS.getSourceRange(); 369 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 370 } 371 } else { 372 TheSema.Diag(DS.getRestrictSpecLoc(), 373 diag::err_typecheck_invalid_restrict_not_pointer) 374 << Result << DS.getSourceRange(); 375 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 376 } 377 } 378 379 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification 380 // of a function type includes any type qualifiers, the behavior is 381 // undefined." 382 if (Result->isFunctionType() && TypeQuals) { 383 // Get some location to point at, either the C or V location. 384 SourceLocation Loc; 385 if (TypeQuals & DeclSpec::TQ_const) 386 Loc = DS.getConstSpecLoc(); 387 else if (TypeQuals & DeclSpec::TQ_volatile) 388 Loc = DS.getVolatileSpecLoc(); 389 else { 390 assert((TypeQuals & DeclSpec::TQ_restrict) && 391 "Has CVR quals but not C, V, or R?"); 392 Loc = DS.getRestrictSpecLoc(); 393 } 394 TheSema.Diag(Loc, diag::warn_typecheck_function_qualifiers) 395 << Result << DS.getSourceRange(); 396 } 397 398 // C++ [dcl.ref]p1: 399 // Cv-qualified references are ill-formed except when the 400 // cv-qualifiers are introduced through the use of a typedef 401 // (7.1.3) or of a template type argument (14.3), in which 402 // case the cv-qualifiers are ignored. 403 // FIXME: Shouldn't we be checking SCS_typedef here? 404 if (DS.getTypeSpecType() == DeclSpec::TST_typename && 405 TypeQuals && Result->isReferenceType()) { 406 TypeQuals &= ~DeclSpec::TQ_const; 407 TypeQuals &= ~DeclSpec::TQ_volatile; 408 } 409 410 Qualifiers Quals = Qualifiers::fromCVRMask(TypeQuals); 411 Result = Context.getQualifiedType(Result, Quals); 412 } 413 414 return Result; 415} 416 417static std::string getPrintableNameForEntity(DeclarationName Entity) { 418 if (Entity) 419 return Entity.getAsString(); 420 421 return "type name"; 422} 423 424/// \brief Build a pointer type. 425/// 426/// \param T The type to which we'll be building a pointer. 427/// 428/// \param Quals The cvr-qualifiers to be applied to the pointer type. 429/// 430/// \param Loc The location of the entity whose type involves this 431/// pointer type or, if there is no such entity, the location of the 432/// type that will have pointer type. 433/// 434/// \param Entity The name of the entity that involves the pointer 435/// type, if known. 436/// 437/// \returns A suitable pointer type, if there are no 438/// errors. Otherwise, returns a NULL type. 439QualType Sema::BuildPointerType(QualType T, unsigned Quals, 440 SourceLocation Loc, DeclarationName Entity) { 441 if (T->isReferenceType()) { 442 // C++ 8.3.2p4: There shall be no ... pointers to references ... 443 Diag(Loc, diag::err_illegal_decl_pointer_to_reference) 444 << getPrintableNameForEntity(Entity) << T; 445 return QualType(); 446 } 447 448 Qualifiers Qs = Qualifiers::fromCVRMask(Quals); 449 450 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 451 // object or incomplete types shall not be restrict-qualified." 452 if (Qs.hasRestrict() && !T->isIncompleteOrObjectType()) { 453 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 454 << T; 455 Qs.removeRestrict(); 456 } 457 458 // Build the pointer type. 459 return Context.getQualifiedType(Context.getPointerType(T), Qs); 460} 461 462/// \brief Build a reference type. 463/// 464/// \param T The type to which we'll be building a reference. 465/// 466/// \param CVR The cvr-qualifiers to be applied to the reference type. 467/// 468/// \param Loc The location of the entity whose type involves this 469/// reference type or, if there is no such entity, the location of the 470/// type that will have reference type. 471/// 472/// \param Entity The name of the entity that involves the reference 473/// type, if known. 474/// 475/// \returns A suitable reference type, if there are no 476/// errors. Otherwise, returns a NULL type. 477QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue, 478 unsigned CVR, SourceLocation Loc, 479 DeclarationName Entity) { 480 Qualifiers Quals = Qualifiers::fromCVRMask(CVR); 481 482 bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>(); 483 484 // C++0x [dcl.typedef]p9: If a typedef TD names a type that is a 485 // reference to a type T, and attempt to create the type "lvalue 486 // reference to cv TD" creates the type "lvalue reference to T". 487 // We use the qualifiers (restrict or none) of the original reference, 488 // not the new ones. This is consistent with GCC. 489 490 // C++ [dcl.ref]p4: There shall be no references to references. 491 // 492 // According to C++ DR 106, references to references are only 493 // diagnosed when they are written directly (e.g., "int & &"), 494 // but not when they happen via a typedef: 495 // 496 // typedef int& intref; 497 // typedef intref& intref2; 498 // 499 // Parser::ParseDeclaratorInternal diagnoses the case where 500 // references are written directly; here, we handle the 501 // collapsing of references-to-references as described in C++ 502 // DR 106 and amended by C++ DR 540. 503 504 // C++ [dcl.ref]p1: 505 // A declarator that specifies the type "reference to cv void" 506 // is ill-formed. 507 if (T->isVoidType()) { 508 Diag(Loc, diag::err_reference_to_void); 509 return QualType(); 510 } 511 512 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 513 // object or incomplete types shall not be restrict-qualified." 514 if (Quals.hasRestrict() && !T->isIncompleteOrObjectType()) { 515 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 516 << T; 517 Quals.removeRestrict(); 518 } 519 520 // C++ [dcl.ref]p1: 521 // [...] Cv-qualified references are ill-formed except when the 522 // cv-qualifiers are introduced through the use of a typedef 523 // (7.1.3) or of a template type argument (14.3), in which case 524 // the cv-qualifiers are ignored. 525 // 526 // We diagnose extraneous cv-qualifiers for the non-typedef, 527 // non-template type argument case within the parser. Here, we just 528 // ignore any extraneous cv-qualifiers. 529 Quals.removeConst(); 530 Quals.removeVolatile(); 531 532 // Handle restrict on references. 533 if (LValueRef) 534 return Context.getQualifiedType( 535 Context.getLValueReferenceType(T, SpelledAsLValue), Quals); 536 return Context.getQualifiedType(Context.getRValueReferenceType(T), Quals); 537} 538 539/// \brief Build an array type. 540/// 541/// \param T The type of each element in the array. 542/// 543/// \param ASM C99 array size modifier (e.g., '*', 'static'). 544/// 545/// \param ArraySize Expression describing the size of the array. 546/// 547/// \param Quals The cvr-qualifiers to be applied to the array's 548/// element type. 549/// 550/// \param Loc The location of the entity whose type involves this 551/// array type or, if there is no such entity, the location of the 552/// type that will have array type. 553/// 554/// \param Entity The name of the entity that involves the array 555/// type, if known. 556/// 557/// \returns A suitable array type, if there are no errors. Otherwise, 558/// returns a NULL type. 559QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM, 560 Expr *ArraySize, unsigned Quals, 561 SourceRange Brackets, DeclarationName Entity) { 562 563 SourceLocation Loc = Brackets.getBegin(); 564 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 565 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 566 // Not in C++, though. There we only dislike void. 567 if (getLangOptions().CPlusPlus) { 568 if (T->isVoidType()) { 569 Diag(Loc, diag::err_illegal_decl_array_incomplete_type) << T; 570 return QualType(); 571 } 572 } else { 573 if (RequireCompleteType(Loc, T, 574 diag::err_illegal_decl_array_incomplete_type)) 575 return QualType(); 576 } 577 578 if (T->isFunctionType()) { 579 Diag(Loc, diag::err_illegal_decl_array_of_functions) 580 << getPrintableNameForEntity(Entity) << T; 581 return QualType(); 582 } 583 584 // C++ 8.3.2p4: There shall be no ... arrays of references ... 585 if (T->isReferenceType()) { 586 Diag(Loc, diag::err_illegal_decl_array_of_references) 587 << getPrintableNameForEntity(Entity) << T; 588 return QualType(); 589 } 590 591 if (Context.getCanonicalType(T) == Context.UndeducedAutoTy) { 592 Diag(Loc, diag::err_illegal_decl_array_of_auto) 593 << getPrintableNameForEntity(Entity); 594 return QualType(); 595 } 596 597 if (const RecordType *EltTy = T->getAs<RecordType>()) { 598 // If the element type is a struct or union that contains a variadic 599 // array, accept it as a GNU extension: C99 6.7.2.1p2. 600 if (EltTy->getDecl()->hasFlexibleArrayMember()) 601 Diag(Loc, diag::ext_flexible_array_in_array) << T; 602 } else if (T->isObjCInterfaceType()) { 603 Diag(Loc, diag::err_objc_array_of_interfaces) << T; 604 return QualType(); 605 } 606 607 // C99 6.7.5.2p1: The size expression shall have integer type. 608 if (ArraySize && !ArraySize->isTypeDependent() && 609 !ArraySize->getType()->isIntegerType()) { 610 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 611 << ArraySize->getType() << ArraySize->getSourceRange(); 612 ArraySize->Destroy(Context); 613 return QualType(); 614 } 615 llvm::APSInt ConstVal(32); 616 if (!ArraySize) { 617 if (ASM == ArrayType::Star) 618 T = Context.getVariableArrayType(T, 0, ASM, Quals, Brackets); 619 else 620 T = Context.getIncompleteArrayType(T, ASM, Quals); 621 } else if (ArraySize->isValueDependent()) { 622 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets); 623 } else if (!ArraySize->isIntegerConstantExpr(ConstVal, Context) || 624 (!T->isDependentType() && !T->isIncompleteType() && 625 !T->isConstantSizeType())) { 626 // Per C99, a variable array is an array with either a non-constant 627 // size or an element type that has a non-constant-size 628 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets); 629 } else { 630 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 631 // have a value greater than zero. 632 if (ConstVal.isSigned() && ConstVal.isNegative()) { 633 Diag(ArraySize->getLocStart(), 634 diag::err_typecheck_negative_array_size) 635 << ArraySize->getSourceRange(); 636 return QualType(); 637 } 638 if (ConstVal == 0) { 639 // GCC accepts zero sized static arrays. 640 Diag(ArraySize->getLocStart(), diag::ext_typecheck_zero_array_size) 641 << ArraySize->getSourceRange(); 642 } 643 T = Context.getConstantArrayType(T, ConstVal, ASM, Quals); 644 } 645 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 646 if (!getLangOptions().C99) { 647 if (ArraySize && !ArraySize->isTypeDependent() && 648 !ArraySize->isValueDependent() && 649 !ArraySize->isIntegerConstantExpr(Context)) 650 Diag(Loc, getLangOptions().CPlusPlus? diag::err_vla_cxx : diag::ext_vla); 651 else if (ASM != ArrayType::Normal || Quals != 0) 652 Diag(Loc, 653 getLangOptions().CPlusPlus? diag::err_c99_array_usage_cxx 654 : diag::ext_c99_array_usage); 655 } 656 657 return T; 658} 659 660/// \brief Build an ext-vector type. 661/// 662/// Run the required checks for the extended vector type. 663QualType Sema::BuildExtVectorType(QualType T, ExprArg ArraySize, 664 SourceLocation AttrLoc) { 665 666 Expr *Arg = (Expr *)ArraySize.get(); 667 668 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 669 // in conjunction with complex types (pointers, arrays, functions, etc.). 670 if (!T->isDependentType() && 671 !T->isIntegerType() && !T->isRealFloatingType()) { 672 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T; 673 return QualType(); 674 } 675 676 if (!Arg->isTypeDependent() && !Arg->isValueDependent()) { 677 llvm::APSInt vecSize(32); 678 if (!Arg->isIntegerConstantExpr(vecSize, Context)) { 679 Diag(AttrLoc, diag::err_attribute_argument_not_int) 680 << "ext_vector_type" << Arg->getSourceRange(); 681 return QualType(); 682 } 683 684 // unlike gcc's vector_size attribute, the size is specified as the 685 // number of elements, not the number of bytes. 686 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 687 688 if (vectorSize == 0) { 689 Diag(AttrLoc, diag::err_attribute_zero_size) 690 << Arg->getSourceRange(); 691 return QualType(); 692 } 693 694 if (!T->isDependentType()) 695 return Context.getExtVectorType(T, vectorSize); 696 } 697 698 return Context.getDependentSizedExtVectorType(T, ArraySize.takeAs<Expr>(), 699 AttrLoc); 700} 701 702/// \brief Build a function type. 703/// 704/// This routine checks the function type according to C++ rules and 705/// under the assumption that the result type and parameter types have 706/// just been instantiated from a template. It therefore duplicates 707/// some of the behavior of GetTypeForDeclarator, but in a much 708/// simpler form that is only suitable for this narrow use case. 709/// 710/// \param T The return type of the function. 711/// 712/// \param ParamTypes The parameter types of the function. This array 713/// will be modified to account for adjustments to the types of the 714/// function parameters. 715/// 716/// \param NumParamTypes The number of parameter types in ParamTypes. 717/// 718/// \param Variadic Whether this is a variadic function type. 719/// 720/// \param Quals The cvr-qualifiers to be applied to the function type. 721/// 722/// \param Loc The location of the entity whose type involves this 723/// function type or, if there is no such entity, the location of the 724/// type that will have function type. 725/// 726/// \param Entity The name of the entity that involves the function 727/// type, if known. 728/// 729/// \returns A suitable function type, if there are no 730/// errors. Otherwise, returns a NULL type. 731QualType Sema::BuildFunctionType(QualType T, 732 QualType *ParamTypes, 733 unsigned NumParamTypes, 734 bool Variadic, unsigned Quals, 735 SourceLocation Loc, DeclarationName Entity) { 736 if (T->isArrayType() || T->isFunctionType()) { 737 Diag(Loc, diag::err_func_returning_array_function) << T; 738 return QualType(); 739 } 740 741 bool Invalid = false; 742 for (unsigned Idx = 0; Idx < NumParamTypes; ++Idx) { 743 QualType ParamType = adjustParameterType(ParamTypes[Idx]); 744 if (ParamType->isVoidType()) { 745 Diag(Loc, diag::err_param_with_void_type); 746 Invalid = true; 747 } 748 749 ParamTypes[Idx] = ParamType; 750 } 751 752 if (Invalid) 753 return QualType(); 754 755 return Context.getFunctionType(T, ParamTypes, NumParamTypes, Variadic, 756 Quals); 757} 758 759/// \brief Build a member pointer type \c T Class::*. 760/// 761/// \param T the type to which the member pointer refers. 762/// \param Class the class type into which the member pointer points. 763/// \param CVR Qualifiers applied to the member pointer type 764/// \param Loc the location where this type begins 765/// \param Entity the name of the entity that will have this member pointer type 766/// 767/// \returns a member pointer type, if successful, or a NULL type if there was 768/// an error. 769QualType Sema::BuildMemberPointerType(QualType T, QualType Class, 770 unsigned CVR, SourceLocation Loc, 771 DeclarationName Entity) { 772 Qualifiers Quals = Qualifiers::fromCVRMask(CVR); 773 774 // Verify that we're not building a pointer to pointer to function with 775 // exception specification. 776 if (CheckDistantExceptionSpec(T)) { 777 Diag(Loc, diag::err_distant_exception_spec); 778 779 // FIXME: If we're doing this as part of template instantiation, 780 // we should return immediately. 781 782 // Build the type anyway, but use the canonical type so that the 783 // exception specifiers are stripped off. 784 T = Context.getCanonicalType(T); 785 } 786 787 // C++ 8.3.3p3: A pointer to member shall not pointer to ... a member 788 // with reference type, or "cv void." 789 if (T->isReferenceType()) { 790 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference) 791 << (Entity? Entity.getAsString() : "type name") << T; 792 return QualType(); 793 } 794 795 if (T->isVoidType()) { 796 Diag(Loc, diag::err_illegal_decl_mempointer_to_void) 797 << (Entity? Entity.getAsString() : "type name"); 798 return QualType(); 799 } 800 801 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 802 // object or incomplete types shall not be restrict-qualified." 803 if (Quals.hasRestrict() && !T->isIncompleteOrObjectType()) { 804 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 805 << T; 806 807 // FIXME: If we're doing this as part of template instantiation, 808 // we should return immediately. 809 Quals.removeRestrict(); 810 } 811 812 if (!Class->isDependentType() && !Class->isRecordType()) { 813 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class; 814 return QualType(); 815 } 816 817 return Context.getQualifiedType( 818 Context.getMemberPointerType(T, Class.getTypePtr()), Quals); 819} 820 821/// \brief Build a block pointer type. 822/// 823/// \param T The type to which we'll be building a block pointer. 824/// 825/// \param CVR The cvr-qualifiers to be applied to the block pointer type. 826/// 827/// \param Loc The location of the entity whose type involves this 828/// block pointer type or, if there is no such entity, the location of the 829/// type that will have block pointer type. 830/// 831/// \param Entity The name of the entity that involves the block pointer 832/// type, if known. 833/// 834/// \returns A suitable block pointer type, if there are no 835/// errors. Otherwise, returns a NULL type. 836QualType Sema::BuildBlockPointerType(QualType T, unsigned CVR, 837 SourceLocation Loc, 838 DeclarationName Entity) { 839 if (!T->isFunctionType()) { 840 Diag(Loc, diag::err_nonfunction_block_type); 841 return QualType(); 842 } 843 844 Qualifiers Quals = Qualifiers::fromCVRMask(CVR); 845 return Context.getQualifiedType(Context.getBlockPointerType(T), Quals); 846} 847 848QualType Sema::GetTypeFromParser(TypeTy *Ty, DeclaratorInfo **DInfo) { 849 QualType QT = QualType::getFromOpaquePtr(Ty); 850 if (QT.isNull()) { 851 if (DInfo) *DInfo = 0; 852 return QualType(); 853 } 854 855 DeclaratorInfo *DI = 0; 856 if (LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) { 857 QT = LIT->getType(); 858 DI = LIT->getDeclaratorInfo(); 859 } 860 861 if (DInfo) *DInfo = DI; 862 return QT; 863} 864 865/// GetTypeForDeclarator - Convert the type for the specified 866/// declarator to Type instances. 867/// 868/// If OwnedDecl is non-NULL, and this declarator's decl-specifier-seq 869/// owns the declaration of a type (e.g., the definition of a struct 870/// type), then *OwnedDecl will receive the owned declaration. 871QualType Sema::GetTypeForDeclarator(Declarator &D, Scope *S, 872 DeclaratorInfo **DInfo, 873 TagDecl **OwnedDecl) { 874 // Determine the type of the declarator. Not all forms of declarator 875 // have a type. 876 QualType T; 877 878 switch (D.getName().getKind()) { 879 case UnqualifiedId::IK_Identifier: 880 case UnqualifiedId::IK_OperatorFunctionId: 881 case UnqualifiedId::IK_TemplateId: 882 T = ConvertDeclSpecToType(D, *this); 883 884 if (!D.isInvalidType() && OwnedDecl && D.getDeclSpec().isTypeSpecOwned()) 885 *OwnedDecl = cast<TagDecl>((Decl *)D.getDeclSpec().getTypeRep()); 886 break; 887 888 case UnqualifiedId::IK_ConstructorName: 889 case UnqualifiedId::IK_DestructorName: 890 case UnqualifiedId::IK_ConversionFunctionId: 891 // Constructors and destructors don't have return types. Use 892 // "void" instead. Conversion operators will check their return 893 // types separately. 894 T = Context.VoidTy; 895 break; 896 } 897 898 if (T == Context.UndeducedAutoTy) { 899 int Error = -1; 900 901 switch (D.getContext()) { 902 case Declarator::KNRTypeListContext: 903 assert(0 && "K&R type lists aren't allowed in C++"); 904 break; 905 case Declarator::PrototypeContext: 906 Error = 0; // Function prototype 907 break; 908 case Declarator::MemberContext: 909 switch (cast<TagDecl>(CurContext)->getTagKind()) { 910 case TagDecl::TK_enum: assert(0 && "unhandled tag kind"); break; 911 case TagDecl::TK_struct: Error = 1; /* Struct member */ break; 912 case TagDecl::TK_union: Error = 2; /* Union member */ break; 913 case TagDecl::TK_class: Error = 3; /* Class member */ break; 914 } 915 break; 916 case Declarator::CXXCatchContext: 917 Error = 4; // Exception declaration 918 break; 919 case Declarator::TemplateParamContext: 920 Error = 5; // Template parameter 921 break; 922 case Declarator::BlockLiteralContext: 923 Error = 6; // Block literal 924 break; 925 case Declarator::FileContext: 926 case Declarator::BlockContext: 927 case Declarator::ForContext: 928 case Declarator::ConditionContext: 929 case Declarator::TypeNameContext: 930 break; 931 } 932 933 if (Error != -1) { 934 Diag(D.getDeclSpec().getTypeSpecTypeLoc(), diag::err_auto_not_allowed) 935 << Error; 936 T = Context.IntTy; 937 D.setInvalidType(true); 938 } 939 } 940 941 // The name we're declaring, if any. 942 DeclarationName Name; 943 if (D.getIdentifier()) 944 Name = D.getIdentifier(); 945 946 // Walk the DeclTypeInfo, building the recursive type as we go. 947 // DeclTypeInfos are ordered from the identifier out, which is 948 // opposite of what we want :). 949 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 950 DeclaratorChunk &DeclType = D.getTypeObject(e-i-1); 951 switch (DeclType.Kind) { 952 default: assert(0 && "Unknown decltype!"); 953 case DeclaratorChunk::BlockPointer: 954 // If blocks are disabled, emit an error. 955 if (!LangOpts.Blocks) 956 Diag(DeclType.Loc, diag::err_blocks_disable); 957 958 T = BuildBlockPointerType(T, DeclType.Cls.TypeQuals, D.getIdentifierLoc(), 959 Name); 960 break; 961 case DeclaratorChunk::Pointer: 962 // Verify that we're not building a pointer to pointer to function with 963 // exception specification. 964 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 965 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 966 D.setInvalidType(true); 967 // Build the type anyway. 968 } 969 if (getLangOptions().ObjC1 && T->isObjCInterfaceType()) { 970 const ObjCInterfaceType *OIT = T->getAs<ObjCInterfaceType>(); 971 T = Context.getObjCObjectPointerType(T, 972 (ObjCProtocolDecl **)OIT->qual_begin(), 973 OIT->getNumProtocols()); 974 break; 975 } 976 T = BuildPointerType(T, DeclType.Ptr.TypeQuals, DeclType.Loc, Name); 977 break; 978 case DeclaratorChunk::Reference: { 979 Qualifiers Quals; 980 if (DeclType.Ref.HasRestrict) Quals.addRestrict(); 981 982 // Verify that we're not building a reference to pointer to function with 983 // exception specification. 984 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 985 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 986 D.setInvalidType(true); 987 // Build the type anyway. 988 } 989 T = BuildReferenceType(T, DeclType.Ref.LValueRef, Quals, 990 DeclType.Loc, Name); 991 break; 992 } 993 case DeclaratorChunk::Array: { 994 // Verify that we're not building an array of pointers to function with 995 // exception specification. 996 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 997 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 998 D.setInvalidType(true); 999 // Build the type anyway. 1000 } 1001 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 1002 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 1003 ArrayType::ArraySizeModifier ASM; 1004 if (ATI.isStar) 1005 ASM = ArrayType::Star; 1006 else if (ATI.hasStatic) 1007 ASM = ArrayType::Static; 1008 else 1009 ASM = ArrayType::Normal; 1010 if (ASM == ArrayType::Star && 1011 D.getContext() != Declarator::PrototypeContext) { 1012 // FIXME: This check isn't quite right: it allows star in prototypes 1013 // for function definitions, and disallows some edge cases detailed 1014 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html 1015 Diag(DeclType.Loc, diag::err_array_star_outside_prototype); 1016 ASM = ArrayType::Normal; 1017 D.setInvalidType(true); 1018 } 1019 T = BuildArrayType(T, ASM, ArraySize, 1020 Qualifiers::fromCVRMask(ATI.TypeQuals), 1021 SourceRange(DeclType.Loc, DeclType.EndLoc), Name); 1022 break; 1023 } 1024 case DeclaratorChunk::Function: { 1025 // If the function declarator has a prototype (i.e. it is not () and 1026 // does not have a K&R-style identifier list), then the arguments are part 1027 // of the type, otherwise the argument list is (). 1028 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 1029 1030 // C99 6.7.5.3p1: The return type may not be a function or array type. 1031 if (T->isArrayType() || T->isFunctionType()) { 1032 Diag(DeclType.Loc, diag::err_func_returning_array_function) << T; 1033 T = Context.IntTy; 1034 D.setInvalidType(true); 1035 } 1036 1037 if (getLangOptions().CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) { 1038 // C++ [dcl.fct]p6: 1039 // Types shall not be defined in return or parameter types. 1040 TagDecl *Tag = cast<TagDecl>((Decl *)D.getDeclSpec().getTypeRep()); 1041 if (Tag->isDefinition()) 1042 Diag(Tag->getLocation(), diag::err_type_defined_in_result_type) 1043 << Context.getTypeDeclType(Tag); 1044 } 1045 1046 // Exception specs are not allowed in typedefs. Complain, but add it 1047 // anyway. 1048 if (FTI.hasExceptionSpec && 1049 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1050 Diag(FTI.getThrowLoc(), diag::err_exception_spec_in_typedef); 1051 1052 if (FTI.NumArgs == 0) { 1053 if (getLangOptions().CPlusPlus) { 1054 // C++ 8.3.5p2: If the parameter-declaration-clause is empty, the 1055 // function takes no arguments. 1056 llvm::SmallVector<QualType, 4> Exceptions; 1057 Exceptions.reserve(FTI.NumExceptions); 1058 for (unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) { 1059 // FIXME: Preserve type source info. 1060 QualType ET = GetTypeFromParser(FTI.Exceptions[ei].Ty); 1061 // Check that the type is valid for an exception spec, and drop it 1062 // if not. 1063 if (!CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range)) 1064 Exceptions.push_back(ET); 1065 } 1066 T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic, FTI.TypeQuals, 1067 FTI.hasExceptionSpec, 1068 FTI.hasAnyExceptionSpec, 1069 Exceptions.size(), Exceptions.data()); 1070 } else if (FTI.isVariadic) { 1071 // We allow a zero-parameter variadic function in C if the 1072 // function is marked with the "overloadable" 1073 // attribute. Scan for this attribute now. 1074 bool Overloadable = false; 1075 for (const AttributeList *Attrs = D.getAttributes(); 1076 Attrs; Attrs = Attrs->getNext()) { 1077 if (Attrs->getKind() == AttributeList::AT_overloadable) { 1078 Overloadable = true; 1079 break; 1080 } 1081 } 1082 1083 if (!Overloadable) 1084 Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); 1085 T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic, 0); 1086 } else { 1087 // Simple void foo(), where the incoming T is the result type. 1088 T = Context.getFunctionNoProtoType(T); 1089 } 1090 } else if (FTI.ArgInfo[0].Param == 0) { 1091 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function definition. 1092 Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 1093 D.setInvalidType(true); 1094 } else { 1095 // Otherwise, we have a function with an argument list that is 1096 // potentially variadic. 1097 llvm::SmallVector<QualType, 16> ArgTys; 1098 1099 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 1100 ParmVarDecl *Param = 1101 cast<ParmVarDecl>(FTI.ArgInfo[i].Param.getAs<Decl>()); 1102 QualType ArgTy = Param->getType(); 1103 assert(!ArgTy.isNull() && "Couldn't parse type?"); 1104 1105 // Adjust the parameter type. 1106 assert((ArgTy == adjustParameterType(ArgTy)) && "Unadjusted type?"); 1107 1108 // Look for 'void'. void is allowed only as a single argument to a 1109 // function with no other parameters (C99 6.7.5.3p10). We record 1110 // int(void) as a FunctionProtoType with an empty argument list. 1111 if (ArgTy->isVoidType()) { 1112 // If this is something like 'float(int, void)', reject it. 'void' 1113 // is an incomplete type (C99 6.2.5p19) and function decls cannot 1114 // have arguments of incomplete type. 1115 if (FTI.NumArgs != 1 || FTI.isVariadic) { 1116 Diag(DeclType.Loc, diag::err_void_only_param); 1117 ArgTy = Context.IntTy; 1118 Param->setType(ArgTy); 1119 } else if (FTI.ArgInfo[i].Ident) { 1120 // Reject, but continue to parse 'int(void abc)'. 1121 Diag(FTI.ArgInfo[i].IdentLoc, 1122 diag::err_param_with_void_type); 1123 ArgTy = Context.IntTy; 1124 Param->setType(ArgTy); 1125 } else { 1126 // Reject, but continue to parse 'float(const void)'. 1127 if (ArgTy.hasQualifiers()) 1128 Diag(DeclType.Loc, diag::err_void_param_qualified); 1129 1130 // Do not add 'void' to the ArgTys list. 1131 break; 1132 } 1133 } else if (!FTI.hasPrototype) { 1134 if (ArgTy->isPromotableIntegerType()) { 1135 ArgTy = Context.getPromotedIntegerType(ArgTy); 1136 } else if (const BuiltinType* BTy = ArgTy->getAs<BuiltinType>()) { 1137 if (BTy->getKind() == BuiltinType::Float) 1138 ArgTy = Context.DoubleTy; 1139 } 1140 } 1141 1142 ArgTys.push_back(ArgTy); 1143 } 1144 1145 llvm::SmallVector<QualType, 4> Exceptions; 1146 Exceptions.reserve(FTI.NumExceptions); 1147 for (unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) { 1148 // FIXME: Preserve type source info. 1149 QualType ET = GetTypeFromParser(FTI.Exceptions[ei].Ty); 1150 // Check that the type is valid for an exception spec, and drop it if 1151 // not. 1152 if (!CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range)) 1153 Exceptions.push_back(ET); 1154 } 1155 1156 T = Context.getFunctionType(T, ArgTys.data(), ArgTys.size(), 1157 FTI.isVariadic, FTI.TypeQuals, 1158 FTI.hasExceptionSpec, 1159 FTI.hasAnyExceptionSpec, 1160 Exceptions.size(), Exceptions.data()); 1161 } 1162 break; 1163 } 1164 case DeclaratorChunk::MemberPointer: 1165 // Verify that we're not building a pointer to pointer to function with 1166 // exception specification. 1167 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 1168 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 1169 D.setInvalidType(true); 1170 // Build the type anyway. 1171 } 1172 // The scope spec must refer to a class, or be dependent. 1173 QualType ClsType; 1174 if (isDependentScopeSpecifier(DeclType.Mem.Scope()) 1175 || dyn_cast_or_null<CXXRecordDecl>( 1176 computeDeclContext(DeclType.Mem.Scope()))) { 1177 NestedNameSpecifier *NNS 1178 = (NestedNameSpecifier *)DeclType.Mem.Scope().getScopeRep(); 1179 NestedNameSpecifier *NNSPrefix = NNS->getPrefix(); 1180 switch (NNS->getKind()) { 1181 case NestedNameSpecifier::Identifier: 1182 ClsType = Context.getTypenameType(NNSPrefix, NNS->getAsIdentifier()); 1183 break; 1184 1185 case NestedNameSpecifier::Namespace: 1186 case NestedNameSpecifier::Global: 1187 llvm::llvm_unreachable("Nested-name-specifier must name a type"); 1188 break; 1189 1190 case NestedNameSpecifier::TypeSpec: 1191 case NestedNameSpecifier::TypeSpecWithTemplate: 1192 ClsType = QualType(NNS->getAsType(), 0); 1193 if (NNSPrefix) 1194 ClsType = Context.getQualifiedNameType(NNSPrefix, ClsType); 1195 break; 1196 } 1197 } else { 1198 Diag(DeclType.Mem.Scope().getBeginLoc(), 1199 diag::err_illegal_decl_mempointer_in_nonclass) 1200 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 1201 << DeclType.Mem.Scope().getRange(); 1202 D.setInvalidType(true); 1203 } 1204 1205 if (!ClsType.isNull()) 1206 T = BuildMemberPointerType(T, ClsType, DeclType.Mem.TypeQuals, 1207 DeclType.Loc, D.getIdentifier()); 1208 if (T.isNull()) { 1209 T = Context.IntTy; 1210 D.setInvalidType(true); 1211 } 1212 break; 1213 } 1214 1215 if (T.isNull()) { 1216 D.setInvalidType(true); 1217 T = Context.IntTy; 1218 } 1219 1220 // See if there are any attributes on this declarator chunk. 1221 if (const AttributeList *AL = DeclType.getAttrs()) 1222 ProcessTypeAttributeList(T, AL); 1223 } 1224 1225 if (getLangOptions().CPlusPlus && T->isFunctionType()) { 1226 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>(); 1227 assert(FnTy && "Why oh why is there not a FunctionProtoType here?"); 1228 1229 // C++ 8.3.5p4: A cv-qualifier-seq shall only be part of the function type 1230 // for a nonstatic member function, the function type to which a pointer 1231 // to member refers, or the top-level function type of a function typedef 1232 // declaration. 1233 if (FnTy->getTypeQuals() != 0 && 1234 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 1235 ((D.getContext() != Declarator::MemberContext && 1236 (!D.getCXXScopeSpec().isSet() || 1237 !computeDeclContext(D.getCXXScopeSpec(), /*FIXME:*/true) 1238 ->isRecord())) || 1239 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static)) { 1240 if (D.isFunctionDeclarator()) 1241 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_function_type); 1242 else 1243 Diag(D.getIdentifierLoc(), 1244 diag::err_invalid_qualified_typedef_function_type_use); 1245 1246 // Strip the cv-quals from the type. 1247 T = Context.getFunctionType(FnTy->getResultType(), FnTy->arg_type_begin(), 1248 FnTy->getNumArgs(), FnTy->isVariadic(), 0); 1249 } 1250 } 1251 1252 // If there were any type attributes applied to the decl itself (not the 1253 // type, apply the type attribute to the type!) 1254 if (const AttributeList *Attrs = D.getAttributes()) 1255 ProcessTypeAttributeList(T, Attrs); 1256 1257 if (DInfo) { 1258 if (D.isInvalidType()) 1259 *DInfo = 0; 1260 else 1261 *DInfo = GetDeclaratorInfoForDeclarator(D, T); 1262 } 1263 1264 return T; 1265} 1266 1267namespace { 1268 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> { 1269 const DeclSpec &DS; 1270 1271 public: 1272 TypeSpecLocFiller(const DeclSpec &DS) : DS(DS) {} 1273 1274 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 1275 Visit(TL.getUnqualifiedLoc()); 1276 } 1277 void VisitTypedefTypeLoc(TypedefTypeLoc TL) { 1278 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 1279 } 1280 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) { 1281 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 1282 1283 if (DS.getProtocolQualifiers()) { 1284 assert(TL.getNumProtocols() > 0); 1285 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 1286 TL.setLAngleLoc(DS.getProtocolLAngleLoc()); 1287 TL.setRAngleLoc(DS.getSourceRange().getEnd()); 1288 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i) 1289 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]); 1290 } else { 1291 assert(TL.getNumProtocols() == 0); 1292 TL.setLAngleLoc(SourceLocation()); 1293 TL.setRAngleLoc(SourceLocation()); 1294 } 1295 } 1296 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 1297 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 1298 1299 TL.setStarLoc(SourceLocation()); 1300 1301 if (DS.getProtocolQualifiers()) { 1302 assert(TL.getNumProtocols() > 0); 1303 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 1304 TL.setHasProtocolsAsWritten(true); 1305 TL.setLAngleLoc(DS.getProtocolLAngleLoc()); 1306 TL.setRAngleLoc(DS.getSourceRange().getEnd()); 1307 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i) 1308 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]); 1309 1310 } else { 1311 assert(TL.getNumProtocols() == 0); 1312 TL.setHasProtocolsAsWritten(false); 1313 TL.setLAngleLoc(SourceLocation()); 1314 TL.setRAngleLoc(SourceLocation()); 1315 } 1316 1317 // This might not have been written with an inner type. 1318 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) { 1319 TL.setHasBaseTypeAsWritten(false); 1320 TL.getBaseTypeLoc().initialize(SourceLocation()); 1321 } else { 1322 TL.setHasBaseTypeAsWritten(true); 1323 Visit(TL.getBaseTypeLoc()); 1324 } 1325 } 1326 void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) { 1327 DeclaratorInfo *DInfo = 0; 1328 Sema::GetTypeFromParser(DS.getTypeRep(), &DInfo); 1329 1330 // If we got no declarator info from previous Sema routines, 1331 // just fill with the typespec loc. 1332 if (!DInfo) { 1333 TL.initialize(DS.getTypeSpecTypeLoc()); 1334 return; 1335 } 1336 1337 TemplateSpecializationTypeLoc OldTL = 1338 cast<TemplateSpecializationTypeLoc>(DInfo->getTypeLoc()); 1339 TL.copy(OldTL); 1340 } 1341 void VisitTypeLoc(TypeLoc TL) { 1342 // FIXME: add other typespec types and change this to an assert. 1343 TL.initialize(DS.getTypeSpecTypeLoc()); 1344 } 1345 }; 1346 1347 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> { 1348 const DeclaratorChunk &Chunk; 1349 1350 public: 1351 DeclaratorLocFiller(const DeclaratorChunk &Chunk) : Chunk(Chunk) {} 1352 1353 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 1354 llvm::llvm_unreachable("qualified type locs not expected here!"); 1355 } 1356 1357 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) { 1358 assert(Chunk.Kind == DeclaratorChunk::BlockPointer); 1359 TL.setCaretLoc(Chunk.Loc); 1360 } 1361 void VisitPointerTypeLoc(PointerTypeLoc TL) { 1362 assert(Chunk.Kind == DeclaratorChunk::Pointer); 1363 TL.setStarLoc(Chunk.Loc); 1364 } 1365 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 1366 assert(Chunk.Kind == DeclaratorChunk::Pointer); 1367 TL.setStarLoc(Chunk.Loc); 1368 TL.setHasBaseTypeAsWritten(true); 1369 TL.setHasProtocolsAsWritten(false); 1370 TL.setLAngleLoc(SourceLocation()); 1371 TL.setRAngleLoc(SourceLocation()); 1372 } 1373 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) { 1374 assert(Chunk.Kind == DeclaratorChunk::MemberPointer); 1375 TL.setStarLoc(Chunk.Loc); 1376 // FIXME: nested name specifier 1377 } 1378 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) { 1379 assert(Chunk.Kind == DeclaratorChunk::Reference); 1380 // 'Amp' is misleading: this might have been originally 1381 /// spelled with AmpAmp. 1382 TL.setAmpLoc(Chunk.Loc); 1383 } 1384 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) { 1385 assert(Chunk.Kind == DeclaratorChunk::Reference); 1386 assert(!Chunk.Ref.LValueRef); 1387 TL.setAmpAmpLoc(Chunk.Loc); 1388 } 1389 void VisitArrayTypeLoc(ArrayTypeLoc TL) { 1390 assert(Chunk.Kind == DeclaratorChunk::Array); 1391 TL.setLBracketLoc(Chunk.Loc); 1392 TL.setRBracketLoc(Chunk.EndLoc); 1393 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts)); 1394 } 1395 void VisitFunctionTypeLoc(FunctionTypeLoc TL) { 1396 assert(Chunk.Kind == DeclaratorChunk::Function); 1397 TL.setLParenLoc(Chunk.Loc); 1398 TL.setRParenLoc(Chunk.EndLoc); 1399 1400 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun; 1401 for (unsigned i = 0, e = TL.getNumArgs(), tpi = 0; i != e; ++i) { 1402 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 1403 TL.setArg(tpi++, Param); 1404 } 1405 // FIXME: exception specs 1406 } 1407 1408 void VisitTypeLoc(TypeLoc TL) { 1409 llvm::llvm_unreachable("unsupported TypeLoc kind in declarator!"); 1410 } 1411 }; 1412} 1413 1414/// \brief Create and instantiate a DeclaratorInfo with type source information. 1415/// 1416/// \param T QualType referring to the type as written in source code. 1417DeclaratorInfo * 1418Sema::GetDeclaratorInfoForDeclarator(Declarator &D, QualType T) { 1419 DeclaratorInfo *DInfo = Context.CreateDeclaratorInfo(T); 1420 UnqualTypeLoc CurrTL = DInfo->getTypeLoc().getUnqualifiedLoc(); 1421 1422 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 1423 DeclaratorLocFiller(D.getTypeObject(i)).Visit(CurrTL); 1424 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 1425 } 1426 1427 TypeSpecLocFiller(D.getDeclSpec()).Visit(CurrTL); 1428 1429 return DInfo; 1430} 1431 1432/// \brief Create a LocInfoType to hold the given QualType and DeclaratorInfo. 1433QualType Sema::CreateLocInfoType(QualType T, DeclaratorInfo *DInfo) { 1434 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser 1435 // and Sema during declaration parsing. Try deallocating/caching them when 1436 // it's appropriate, instead of allocating them and keeping them around. 1437 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType), 8); 1438 new (LocT) LocInfoType(T, DInfo); 1439 assert(LocT->getTypeClass() != T->getTypeClass() && 1440 "LocInfoType's TypeClass conflicts with an existing Type class"); 1441 return QualType(LocT, 0); 1442} 1443 1444void LocInfoType::getAsStringInternal(std::string &Str, 1445 const PrintingPolicy &Policy) const { 1446 assert(false && "LocInfoType leaked into the type system; an opaque TypeTy*" 1447 " was used directly instead of getting the QualType through" 1448 " GetTypeFromParser"); 1449} 1450 1451/// ObjCGetTypeForMethodDefinition - Builds the type for a method definition 1452/// declarator 1453QualType Sema::ObjCGetTypeForMethodDefinition(DeclPtrTy D) { 1454 ObjCMethodDecl *MDecl = cast<ObjCMethodDecl>(D.getAs<Decl>()); 1455 QualType T = MDecl->getResultType(); 1456 llvm::SmallVector<QualType, 16> ArgTys; 1457 1458 // Add the first two invisible argument types for self and _cmd. 1459 if (MDecl->isInstanceMethod()) { 1460 QualType selfTy = Context.getObjCInterfaceType(MDecl->getClassInterface()); 1461 selfTy = Context.getPointerType(selfTy); 1462 ArgTys.push_back(selfTy); 1463 } else 1464 ArgTys.push_back(Context.getObjCIdType()); 1465 ArgTys.push_back(Context.getObjCSelType()); 1466 1467 for (ObjCMethodDecl::param_iterator PI = MDecl->param_begin(), 1468 E = MDecl->param_end(); PI != E; ++PI) { 1469 QualType ArgTy = (*PI)->getType(); 1470 assert(!ArgTy.isNull() && "Couldn't parse type?"); 1471 ArgTy = adjustParameterType(ArgTy); 1472 ArgTys.push_back(ArgTy); 1473 } 1474 T = Context.getFunctionType(T, &ArgTys[0], ArgTys.size(), 1475 MDecl->isVariadic(), 0); 1476 return T; 1477} 1478 1479/// UnwrapSimilarPointerTypes - If T1 and T2 are pointer types that 1480/// may be similar (C++ 4.4), replaces T1 and T2 with the type that 1481/// they point to and return true. If T1 and T2 aren't pointer types 1482/// or pointer-to-member types, or if they are not similar at this 1483/// level, returns false and leaves T1 and T2 unchanged. Top-level 1484/// qualifiers on T1 and T2 are ignored. This function will typically 1485/// be called in a loop that successively "unwraps" pointer and 1486/// pointer-to-member types to compare them at each level. 1487bool Sema::UnwrapSimilarPointerTypes(QualType& T1, QualType& T2) { 1488 const PointerType *T1PtrType = T1->getAs<PointerType>(), 1489 *T2PtrType = T2->getAs<PointerType>(); 1490 if (T1PtrType && T2PtrType) { 1491 T1 = T1PtrType->getPointeeType(); 1492 T2 = T2PtrType->getPointeeType(); 1493 return true; 1494 } 1495 1496 const MemberPointerType *T1MPType = T1->getAs<MemberPointerType>(), 1497 *T2MPType = T2->getAs<MemberPointerType>(); 1498 if (T1MPType && T2MPType && 1499 Context.getCanonicalType(T1MPType->getClass()) == 1500 Context.getCanonicalType(T2MPType->getClass())) { 1501 T1 = T1MPType->getPointeeType(); 1502 T2 = T2MPType->getPointeeType(); 1503 return true; 1504 } 1505 return false; 1506} 1507 1508Sema::TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 1509 // C99 6.7.6: Type names have no identifier. This is already validated by 1510 // the parser. 1511 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 1512 1513 DeclaratorInfo *DInfo = 0; 1514 TagDecl *OwnedTag = 0; 1515 QualType T = GetTypeForDeclarator(D, S, &DInfo, &OwnedTag); 1516 if (D.isInvalidType()) 1517 return true; 1518 1519 if (getLangOptions().CPlusPlus) { 1520 // Check that there are no default arguments (C++ only). 1521 CheckExtraCXXDefaultArguments(D); 1522 1523 // C++0x [dcl.type]p3: 1524 // A type-specifier-seq shall not define a class or enumeration 1525 // unless it appears in the type-id of an alias-declaration 1526 // (7.1.3). 1527 if (OwnedTag && OwnedTag->isDefinition()) 1528 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_type_specifier) 1529 << Context.getTypeDeclType(OwnedTag); 1530 } 1531 1532 if (DInfo) 1533 T = CreateLocInfoType(T, DInfo); 1534 1535 return T.getAsOpaquePtr(); 1536} 1537 1538 1539 1540//===----------------------------------------------------------------------===// 1541// Type Attribute Processing 1542//===----------------------------------------------------------------------===// 1543 1544/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 1545/// specified type. The attribute contains 1 argument, the id of the address 1546/// space for the type. 1547static void HandleAddressSpaceTypeAttribute(QualType &Type, 1548 const AttributeList &Attr, Sema &S){ 1549 1550 // If this type is already address space qualified, reject it. 1551 // Clause 6.7.3 - Type qualifiers: "No type shall be qualified by qualifiers 1552 // for two or more different address spaces." 1553 if (Type.getAddressSpace()) { 1554 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 1555 return; 1556 } 1557 1558 // Check the attribute arguments. 1559 if (Attr.getNumArgs() != 1) { 1560 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1561 return; 1562 } 1563 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 1564 llvm::APSInt addrSpace(32); 1565 if (!ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 1566 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 1567 << ASArgExpr->getSourceRange(); 1568 return; 1569 } 1570 1571 // Bounds checking. 1572 if (addrSpace.isSigned()) { 1573 if (addrSpace.isNegative()) { 1574 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative) 1575 << ASArgExpr->getSourceRange(); 1576 return; 1577 } 1578 addrSpace.setIsSigned(false); 1579 } 1580 llvm::APSInt max(addrSpace.getBitWidth()); 1581 max = Qualifiers::MaxAddressSpace; 1582 if (addrSpace > max) { 1583 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high) 1584 << Qualifiers::MaxAddressSpace << ASArgExpr->getSourceRange(); 1585 return; 1586 } 1587 1588 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 1589 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 1590} 1591 1592/// HandleObjCGCTypeAttribute - Process an objc's gc attribute on the 1593/// specified type. The attribute contains 1 argument, weak or strong. 1594static void HandleObjCGCTypeAttribute(QualType &Type, 1595 const AttributeList &Attr, Sema &S) { 1596 if (Type.getObjCGCAttr() != Qualifiers::GCNone) { 1597 S.Diag(Attr.getLoc(), diag::err_attribute_multiple_objc_gc); 1598 return; 1599 } 1600 1601 // Check the attribute arguments. 1602 if (!Attr.getParameterName()) { 1603 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) 1604 << "objc_gc" << 1; 1605 return; 1606 } 1607 Qualifiers::GC GCAttr; 1608 if (Attr.getNumArgs() != 0) { 1609 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1610 return; 1611 } 1612 if (Attr.getParameterName()->isStr("weak")) 1613 GCAttr = Qualifiers::Weak; 1614 else if (Attr.getParameterName()->isStr("strong")) 1615 GCAttr = Qualifiers::Strong; 1616 else { 1617 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported) 1618 << "objc_gc" << Attr.getParameterName(); 1619 return; 1620 } 1621 1622 Type = S.Context.getObjCGCQualType(Type, GCAttr); 1623} 1624 1625/// HandleNoReturnTypeAttribute - Process the noreturn attribute on the 1626/// specified type. The attribute contains 0 arguments. 1627static void HandleNoReturnTypeAttribute(QualType &Type, 1628 const AttributeList &Attr, Sema &S) { 1629 if (Attr.getNumArgs() != 0) 1630 return; 1631 1632 // We only apply this to a pointer to function or a pointer to block. 1633 if (!Type->isFunctionPointerType() 1634 && !Type->isBlockPointerType() 1635 && !Type->isFunctionType()) 1636 return; 1637 1638 Type = S.Context.getNoReturnType(Type); 1639} 1640 1641void Sema::ProcessTypeAttributeList(QualType &Result, const AttributeList *AL) { 1642 // Scan through and apply attributes to this type where it makes sense. Some 1643 // attributes (such as __address_space__, __vector_size__, etc) apply to the 1644 // type, but others can be present in the type specifiers even though they 1645 // apply to the decl. Here we apply type attributes and ignore the rest. 1646 for (; AL; AL = AL->getNext()) { 1647 // If this is an attribute we can handle, do so now, otherwise, add it to 1648 // the LeftOverAttrs list for rechaining. 1649 switch (AL->getKind()) { 1650 default: break; 1651 case AttributeList::AT_address_space: 1652 HandleAddressSpaceTypeAttribute(Result, *AL, *this); 1653 break; 1654 case AttributeList::AT_objc_gc: 1655 HandleObjCGCTypeAttribute(Result, *AL, *this); 1656 break; 1657 case AttributeList::AT_noreturn: 1658 HandleNoReturnTypeAttribute(Result, *AL, *this); 1659 break; 1660 } 1661 } 1662} 1663 1664/// @brief Ensure that the type T is a complete type. 1665/// 1666/// This routine checks whether the type @p T is complete in any 1667/// context where a complete type is required. If @p T is a complete 1668/// type, returns false. If @p T is a class template specialization, 1669/// this routine then attempts to perform class template 1670/// instantiation. If instantiation fails, or if @p T is incomplete 1671/// and cannot be completed, issues the diagnostic @p diag (giving it 1672/// the type @p T) and returns true. 1673/// 1674/// @param Loc The location in the source that the incomplete type 1675/// diagnostic should refer to. 1676/// 1677/// @param T The type that this routine is examining for completeness. 1678/// 1679/// @param PD The partial diagnostic that will be printed out if T is not a 1680/// complete type. 1681/// 1682/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 1683/// @c false otherwise. 1684bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 1685 const PartialDiagnostic &PD, 1686 std::pair<SourceLocation, 1687 PartialDiagnostic> Note) { 1688 unsigned diag = PD.getDiagID(); 1689 1690 // FIXME: Add this assertion to make sure we always get instantiation points. 1691 // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType"); 1692 // FIXME: Add this assertion to help us flush out problems with 1693 // checking for dependent types and type-dependent expressions. 1694 // 1695 // assert(!T->isDependentType() && 1696 // "Can't ask whether a dependent type is complete"); 1697 1698 // If we have a complete type, we're done. 1699 if (!T->isIncompleteType()) 1700 return false; 1701 1702 // If we have a class template specialization or a class member of a 1703 // class template specialization, or an array with known size of such, 1704 // try to instantiate it. 1705 QualType MaybeTemplate = T; 1706 if (const ConstantArrayType *Array = T->getAs<ConstantArrayType>()) 1707 MaybeTemplate = Array->getElementType(); 1708 if (const RecordType *Record = MaybeTemplate->getAs<RecordType>()) { 1709 if (ClassTemplateSpecializationDecl *ClassTemplateSpec 1710 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { 1711 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) 1712 return InstantiateClassTemplateSpecialization(Loc, ClassTemplateSpec, 1713 TSK_ImplicitInstantiation, 1714 /*Complain=*/diag != 0); 1715 } else if (CXXRecordDecl *Rec 1716 = dyn_cast<CXXRecordDecl>(Record->getDecl())) { 1717 if (CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass()) { 1718 MemberSpecializationInfo *MSInfo = Rec->getMemberSpecializationInfo(); 1719 assert(MSInfo && "Missing member specialization information?"); 1720 // This record was instantiated from a class within a template. 1721 if (MSInfo->getTemplateSpecializationKind() 1722 != TSK_ExplicitSpecialization) 1723 return InstantiateClass(Loc, Rec, Pattern, 1724 getTemplateInstantiationArgs(Rec), 1725 TSK_ImplicitInstantiation, 1726 /*Complain=*/diag != 0); 1727 } 1728 } 1729 } 1730 1731 if (diag == 0) 1732 return true; 1733 1734 // We have an incomplete type. Produce a diagnostic. 1735 Diag(Loc, PD) << T; 1736 1737 // If we have a note, produce it. 1738 if (!Note.first.isInvalid()) 1739 Diag(Note.first, Note.second); 1740 1741 // If the type was a forward declaration of a class/struct/union 1742 // type, produce 1743 const TagType *Tag = 0; 1744 if (const RecordType *Record = T->getAs<RecordType>()) 1745 Tag = Record; 1746 else if (const EnumType *Enum = T->getAs<EnumType>()) 1747 Tag = Enum; 1748 1749 if (Tag && !Tag->getDecl()->isInvalidDecl()) 1750 Diag(Tag->getDecl()->getLocation(), 1751 Tag->isBeingDefined() ? diag::note_type_being_defined 1752 : diag::note_forward_declaration) 1753 << QualType(Tag, 0); 1754 1755 return true; 1756} 1757 1758/// \brief Retrieve a version of the type 'T' that is qualified by the 1759/// nested-name-specifier contained in SS. 1760QualType Sema::getQualifiedNameType(const CXXScopeSpec &SS, QualType T) { 1761 if (!SS.isSet() || SS.isInvalid() || T.isNull()) 1762 return T; 1763 1764 NestedNameSpecifier *NNS 1765 = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 1766 return Context.getQualifiedNameType(NNS, T); 1767} 1768 1769QualType Sema::BuildTypeofExprType(Expr *E) { 1770 return Context.getTypeOfExprType(E); 1771} 1772 1773QualType Sema::BuildDecltypeType(Expr *E) { 1774 if (E->getType() == Context.OverloadTy) { 1775 Diag(E->getLocStart(), 1776 diag::err_cannot_determine_declared_type_of_overloaded_function); 1777 return QualType(); 1778 } 1779 return Context.getDecltypeType(E); 1780} 1781