SemaType.cpp revision f91f5c8a66ffd812f61819836529f8ad437f7e2b
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/DeclObjC.h" 17#include "clang/AST/DeclTemplate.h" 18#include "clang/AST/Expr.h" 19#include "clang/Parse/DeclSpec.h" 20using namespace clang; 21 22/// \brief Perform adjustment on the parameter type of a function. 23/// 24/// This routine adjusts the given parameter type @p T to the actual 25/// parameter type used by semantic analysis (C99 6.7.5.3p[7,8], 26/// C++ [dcl.fct]p3). The adjusted parameter type is returned. 27QualType Sema::adjustParameterType(QualType T) { 28 // C99 6.7.5.3p7: 29 if (T->isArrayType()) { 30 // C99 6.7.5.3p7: 31 // A declaration of a parameter as "array of type" shall be 32 // adjusted to "qualified pointer to type", where the type 33 // qualifiers (if any) are those specified within the [ and ] of 34 // the array type derivation. 35 return Context.getArrayDecayedType(T); 36 } else if (T->isFunctionType()) 37 // C99 6.7.5.3p8: 38 // A declaration of a parameter as "function returning type" 39 // shall be adjusted to "pointer to function returning type", as 40 // in 6.3.2.1. 41 return Context.getPointerType(T); 42 43 return T; 44} 45 46/// \brief Convert the specified declspec to the appropriate type 47/// object. 48/// \param DS the declaration specifiers 49/// \param DeclLoc The location of the declarator identifier or invalid if none. 50/// \returns The type described by the declaration specifiers. This function 51/// never returns null. 52QualType Sema::ConvertDeclSpecToType(const DeclSpec &DS, 53 SourceLocation DeclLoc, 54 bool &isInvalid) { 55 // FIXME: Should move the logic from DeclSpec::Finish to here for validity 56 // checking. 57 QualType Result; 58 59 switch (DS.getTypeSpecType()) { 60 case DeclSpec::TST_void: 61 Result = Context.VoidTy; 62 break; 63 case DeclSpec::TST_char: 64 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 65 Result = Context.CharTy; 66 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) 67 Result = Context.SignedCharTy; 68 else { 69 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 70 "Unknown TSS value"); 71 Result = Context.UnsignedCharTy; 72 } 73 break; 74 case DeclSpec::TST_wchar: 75 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 76 Result = Context.WCharTy; 77 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) { 78 Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 79 << DS.getSpecifierName(DS.getTypeSpecType()); 80 Result = Context.getSignedWCharType(); 81 } else { 82 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 83 "Unknown TSS value"); 84 Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 85 << DS.getSpecifierName(DS.getTypeSpecType()); 86 Result = Context.getUnsignedWCharType(); 87 } 88 break; 89 case DeclSpec::TST_unspecified: 90 // "<proto1,proto2>" is an objc qualified ID with a missing id. 91 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 92 Result = Context.getObjCQualifiedIdType((ObjCProtocolDecl**)PQ, 93 DS.getNumProtocolQualifiers()); 94 break; 95 } 96 97 // Unspecified typespec defaults to int in C90. However, the C90 grammar 98 // [C90 6.5] only allows a decl-spec if there was *some* type-specifier, 99 // type-qualifier, or storage-class-specifier. If not, emit an extwarn. 100 // Note that the one exception to this is function definitions, which are 101 // allowed to be completely missing a declspec. This is handled in the 102 // parser already though by it pretending to have seen an 'int' in this 103 // case. 104 if (getLangOptions().ImplicitInt) { 105 // In C89 mode, we only warn if there is a completely missing declspec 106 // when one is not allowed. 107 if (DS.isEmpty()) { 108 if (DeclLoc.isInvalid()) 109 DeclLoc = DS.getSourceRange().getBegin(); 110 Diag(DeclLoc, diag::warn_missing_declspec) 111 << DS.getSourceRange() 112 << CodeModificationHint::CreateInsertion(DS.getSourceRange().getBegin(), 113 "int"); 114 } 115 } else if (!DS.hasTypeSpecifier()) { 116 // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says: 117 // "At least one type specifier shall be given in the declaration 118 // specifiers in each declaration, and in the specifier-qualifier list in 119 // each struct declaration and type name." 120 // FIXME: Does Microsoft really have the implicit int extension in C++? 121 if (DeclLoc.isInvalid()) 122 DeclLoc = DS.getSourceRange().getBegin(); 123 124 if (getLangOptions().CPlusPlus && !getLangOptions().Microsoft) 125 Diag(DeclLoc, diag::err_missing_type_specifier) 126 << DS.getSourceRange(); 127 else 128 Diag(DeclLoc, diag::warn_missing_type_specifier) 129 << DS.getSourceRange(); 130 131 // FIXME: If we could guarantee that the result would be 132 // well-formed, it would be useful to have a code insertion hint 133 // here. However, after emitting this warning/error, we often 134 // emit other errors. 135 } 136 137 // FALL THROUGH. 138 case DeclSpec::TST_int: { 139 if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) { 140 switch (DS.getTypeSpecWidth()) { 141 case DeclSpec::TSW_unspecified: Result = Context.IntTy; break; 142 case DeclSpec::TSW_short: Result = Context.ShortTy; break; 143 case DeclSpec::TSW_long: Result = Context.LongTy; break; 144 case DeclSpec::TSW_longlong: Result = Context.LongLongTy; break; 145 } 146 } else { 147 switch (DS.getTypeSpecWidth()) { 148 case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break; 149 case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break; 150 case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break; 151 case DeclSpec::TSW_longlong: Result =Context.UnsignedLongLongTy; break; 152 } 153 } 154 break; 155 } 156 case DeclSpec::TST_float: Result = Context.FloatTy; break; 157 case DeclSpec::TST_double: 158 if (DS.getTypeSpecWidth() == DeclSpec::TSW_long) 159 Result = Context.LongDoubleTy; 160 else 161 Result = Context.DoubleTy; 162 break; 163 case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool 164 case DeclSpec::TST_decimal32: // _Decimal32 165 case DeclSpec::TST_decimal64: // _Decimal64 166 case DeclSpec::TST_decimal128: // _Decimal128 167 assert(0 && "FIXME: GNU decimal extensions not supported yet!"); 168 case DeclSpec::TST_class: 169 case DeclSpec::TST_enum: 170 case DeclSpec::TST_union: 171 case DeclSpec::TST_struct: { 172 Decl *D = static_cast<Decl *>(DS.getTypeRep()); 173 assert(D && "Didn't get a decl for a class/enum/union/struct?"); 174 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 175 DS.getTypeSpecSign() == 0 && 176 "Can't handle qualifiers on typedef names yet!"); 177 // TypeQuals handled by caller. 178 Result = Context.getTypeDeclType(cast<TypeDecl>(D)); 179 180 if (D->isInvalidDecl()) 181 isInvalid = true; 182 break; 183 } 184 case DeclSpec::TST_typename: { 185 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 186 DS.getTypeSpecSign() == 0 && 187 "Can't handle qualifiers on typedef names yet!"); 188 Result = QualType::getFromOpaquePtr(DS.getTypeRep()); 189 190 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 191 // FIXME: Adding a TST_objcInterface clause doesn't seem ideal, so 192 // we have this "hack" for now... 193 if (const ObjCInterfaceType *Interface = Result->getAsObjCInterfaceType()) 194 Result = Context.getObjCQualifiedInterfaceType(Interface->getDecl(), 195 (ObjCProtocolDecl**)PQ, 196 DS.getNumProtocolQualifiers()); 197 else if (Result == Context.getObjCIdType()) 198 // id<protocol-list> 199 Result = Context.getObjCQualifiedIdType((ObjCProtocolDecl**)PQ, 200 DS.getNumProtocolQualifiers()); 201 else if (Result == Context.getObjCClassType()) { 202 if (DeclLoc.isInvalid()) 203 DeclLoc = DS.getSourceRange().getBegin(); 204 // Class<protocol-list> 205 Diag(DeclLoc, diag::err_qualified_class_unsupported) 206 << DS.getSourceRange(); 207 } else { 208 if (DeclLoc.isInvalid()) 209 DeclLoc = DS.getSourceRange().getBegin(); 210 Diag(DeclLoc, diag::err_invalid_protocol_qualifiers) 211 << DS.getSourceRange(); 212 isInvalid = true; 213 } 214 } 215 216 // If this is a reference to an invalid typedef, propagate the invalidity. 217 if (TypedefType *TDT = dyn_cast<TypedefType>(Result)) 218 if (TDT->getDecl()->isInvalidDecl()) 219 isInvalid = true; 220 221 // TypeQuals handled by caller. 222 break; 223 } 224 case DeclSpec::TST_typeofType: 225 Result = QualType::getFromOpaquePtr(DS.getTypeRep()); 226 assert(!Result.isNull() && "Didn't get a type for typeof?"); 227 // TypeQuals handled by caller. 228 Result = Context.getTypeOfType(Result); 229 break; 230 case DeclSpec::TST_typeofExpr: { 231 Expr *E = static_cast<Expr *>(DS.getTypeRep()); 232 assert(E && "Didn't get an expression for typeof?"); 233 // TypeQuals handled by caller. 234 Result = Context.getTypeOfExprType(E); 235 break; 236 } 237 case DeclSpec::TST_error: 238 Result = Context.IntTy; 239 isInvalid = true; 240 break; 241 } 242 243 // Handle complex types. 244 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) { 245 if (getLangOptions().Freestanding) 246 Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex); 247 Result = Context.getComplexType(Result); 248 } 249 250 assert(DS.getTypeSpecComplex() != DeclSpec::TSC_imaginary && 251 "FIXME: imaginary types not supported yet!"); 252 253 // See if there are any attributes on the declspec that apply to the type (as 254 // opposed to the decl). 255 if (const AttributeList *AL = DS.getAttributes()) 256 ProcessTypeAttributeList(Result, AL); 257 258 // Apply const/volatile/restrict qualifiers to T. 259 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 260 261 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 262 // or incomplete types shall not be restrict-qualified." C++ also allows 263 // restrict-qualified references. 264 if (TypeQuals & QualType::Restrict) { 265 if (Result->isPointerType() || Result->isReferenceType()) { 266 QualType EltTy = Result->isPointerType() ? 267 Result->getAsPointerType()->getPointeeType() : 268 Result->getAsReferenceType()->getPointeeType(); 269 270 // If we have a pointer or reference, the pointee must have an object 271 // incomplete type. 272 if (!EltTy->isIncompleteOrObjectType()) { 273 Diag(DS.getRestrictSpecLoc(), 274 diag::err_typecheck_invalid_restrict_invalid_pointee) 275 << EltTy << DS.getSourceRange(); 276 TypeQuals &= ~QualType::Restrict; // Remove the restrict qualifier. 277 } 278 } else { 279 Diag(DS.getRestrictSpecLoc(), 280 diag::err_typecheck_invalid_restrict_not_pointer) 281 << Result << DS.getSourceRange(); 282 TypeQuals &= ~QualType::Restrict; // Remove the restrict qualifier. 283 } 284 } 285 286 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification 287 // of a function type includes any type qualifiers, the behavior is 288 // undefined." 289 if (Result->isFunctionType() && TypeQuals) { 290 // Get some location to point at, either the C or V location. 291 SourceLocation Loc; 292 if (TypeQuals & QualType::Const) 293 Loc = DS.getConstSpecLoc(); 294 else { 295 assert((TypeQuals & QualType::Volatile) && 296 "Has CV quals but not C or V?"); 297 Loc = DS.getVolatileSpecLoc(); 298 } 299 Diag(Loc, diag::warn_typecheck_function_qualifiers) 300 << Result << DS.getSourceRange(); 301 } 302 303 // C++ [dcl.ref]p1: 304 // Cv-qualified references are ill-formed except when the 305 // cv-qualifiers are introduced through the use of a typedef 306 // (7.1.3) or of a template type argument (14.3), in which 307 // case the cv-qualifiers are ignored. 308 // FIXME: Shouldn't we be checking SCS_typedef here? 309 if (DS.getTypeSpecType() == DeclSpec::TST_typename && 310 TypeQuals && Result->isReferenceType()) { 311 TypeQuals &= ~QualType::Const; 312 TypeQuals &= ~QualType::Volatile; 313 } 314 315 Result = Result.getQualifiedType(TypeQuals); 316 } 317 return Result; 318} 319 320static std::string getPrintableNameForEntity(DeclarationName Entity) { 321 if (Entity) 322 return Entity.getAsString(); 323 324 return "type name"; 325} 326 327/// \brief Build a pointer type. 328/// 329/// \param T The type to which we'll be building a pointer. 330/// 331/// \param Quals The cvr-qualifiers to be applied to the pointer type. 332/// 333/// \param Loc The location of the entity whose type involves this 334/// pointer type or, if there is no such entity, the location of the 335/// type that will have pointer type. 336/// 337/// \param Entity The name of the entity that involves the pointer 338/// type, if known. 339/// 340/// \returns A suitable pointer type, if there are no 341/// errors. Otherwise, returns a NULL type. 342QualType Sema::BuildPointerType(QualType T, unsigned Quals, 343 SourceLocation Loc, DeclarationName Entity) { 344 if (T->isReferenceType()) { 345 // C++ 8.3.2p4: There shall be no ... pointers to references ... 346 Diag(Loc, diag::err_illegal_decl_pointer_to_reference) 347 << getPrintableNameForEntity(Entity); 348 return QualType(); 349 } 350 351 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 352 // object or incomplete types shall not be restrict-qualified." 353 if ((Quals & QualType::Restrict) && !T->isIncompleteOrObjectType()) { 354 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 355 << T; 356 Quals &= ~QualType::Restrict; 357 } 358 359 // Build the pointer type. 360 return Context.getPointerType(T).getQualifiedType(Quals); 361} 362 363/// \brief Build a reference type. 364/// 365/// \param T The type to which we'll be building a reference. 366/// 367/// \param Quals The cvr-qualifiers to be applied to the reference type. 368/// 369/// \param Loc The location of the entity whose type involves this 370/// reference type or, if there is no such entity, the location of the 371/// type that will have reference type. 372/// 373/// \param Entity The name of the entity that involves the reference 374/// type, if known. 375/// 376/// \returns A suitable reference type, if there are no 377/// errors. Otherwise, returns a NULL type. 378QualType Sema::BuildReferenceType(QualType T, bool LValueRef, unsigned Quals, 379 SourceLocation Loc, DeclarationName Entity) { 380 if (LValueRef) { 381 if (const RValueReferenceType *R = T->getAsRValueReferenceType()) { 382 // C++0x [dcl.typedef]p9: If a typedef TD names a type that is a 383 // reference to a type T, and attempt to create the type "lvalue 384 // reference to cv TD" creates the type "lvalue reference to T". 385 // We use the qualifiers (restrict or none) of the original reference, 386 // not the new ones. This is consistent with GCC. 387 return Context.getLValueReferenceType(R->getPointeeType()). 388 getQualifiedType(T.getCVRQualifiers()); 389 } 390 } 391 if (T->isReferenceType()) { 392 // C++ [dcl.ref]p4: There shall be no references to references. 393 // 394 // According to C++ DR 106, references to references are only 395 // diagnosed when they are written directly (e.g., "int & &"), 396 // but not when they happen via a typedef: 397 // 398 // typedef int& intref; 399 // typedef intref& intref2; 400 // 401 // Parser::ParserDeclaratorInternal diagnoses the case where 402 // references are written directly; here, we handle the 403 // collapsing of references-to-references as described in C++ 404 // DR 106 and amended by C++ DR 540. 405 return T; 406 } 407 408 // C++ [dcl.ref]p1: 409 // A declarator that specifies the type “reference to cv void” 410 // is ill-formed. 411 if (T->isVoidType()) { 412 Diag(Loc, diag::err_reference_to_void); 413 return QualType(); 414 } 415 416 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 417 // object or incomplete types shall not be restrict-qualified." 418 if ((Quals & QualType::Restrict) && !T->isIncompleteOrObjectType()) { 419 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 420 << T; 421 Quals &= ~QualType::Restrict; 422 } 423 424 // C++ [dcl.ref]p1: 425 // [...] Cv-qualified references are ill-formed except when the 426 // cv-qualifiers are introduced through the use of a typedef 427 // (7.1.3) or of a template type argument (14.3), in which case 428 // the cv-qualifiers are ignored. 429 // 430 // We diagnose extraneous cv-qualifiers for the non-typedef, 431 // non-template type argument case within the parser. Here, we just 432 // ignore any extraneous cv-qualifiers. 433 Quals &= ~QualType::Const; 434 Quals &= ~QualType::Volatile; 435 436 // Handle restrict on references. 437 if (LValueRef) 438 return Context.getLValueReferenceType(T).getQualifiedType(Quals); 439 return Context.getRValueReferenceType(T).getQualifiedType(Quals); 440} 441 442/// \brief Build an array type. 443/// 444/// \param T The type of each element in the array. 445/// 446/// \param ASM C99 array size modifier (e.g., '*', 'static'). 447/// 448/// \param ArraySize Expression describing the size of the array. 449/// 450/// \param Quals The cvr-qualifiers to be applied to the array's 451/// element type. 452/// 453/// \param Loc The location of the entity whose type involves this 454/// array type or, if there is no such entity, the location of the 455/// type that will have array type. 456/// 457/// \param Entity The name of the entity that involves the array 458/// type, if known. 459/// 460/// \returns A suitable array type, if there are no errors. Otherwise, 461/// returns a NULL type. 462QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM, 463 Expr *ArraySize, unsigned Quals, 464 SourceLocation Loc, DeclarationName Entity) { 465 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 466 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 467 if (RequireCompleteType(Loc, T, 468 diag::err_illegal_decl_array_incomplete_type)) 469 return QualType(); 470 471 if (T->isFunctionType()) { 472 Diag(Loc, diag::err_illegal_decl_array_of_functions) 473 << getPrintableNameForEntity(Entity); 474 return QualType(); 475 } 476 477 // C++ 8.3.2p4: There shall be no ... arrays of references ... 478 if (T->isReferenceType()) { 479 Diag(Loc, diag::err_illegal_decl_array_of_references) 480 << getPrintableNameForEntity(Entity); 481 return QualType(); 482 } 483 484 if (const RecordType *EltTy = T->getAsRecordType()) { 485 // If the element type is a struct or union that contains a variadic 486 // array, accept it as a GNU extension: C99 6.7.2.1p2. 487 if (EltTy->getDecl()->hasFlexibleArrayMember()) 488 Diag(Loc, diag::ext_flexible_array_in_array) << T; 489 } else if (T->isObjCInterfaceType()) { 490 Diag(Loc, diag::warn_objc_array_of_interfaces) << T; 491 } 492 493 // C99 6.7.5.2p1: The size expression shall have integer type. 494 if (ArraySize && !ArraySize->isTypeDependent() && 495 !ArraySize->getType()->isIntegerType()) { 496 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 497 << ArraySize->getType() << ArraySize->getSourceRange(); 498 ArraySize->Destroy(Context); 499 return QualType(); 500 } 501 llvm::APSInt ConstVal(32); 502 if (!ArraySize) { 503 if (ASM == ArrayType::Star) 504 T = Context.getVariableArrayType(T, 0, ASM, Quals); 505 else 506 T = Context.getIncompleteArrayType(T, ASM, Quals); 507 } else if (ArraySize->isValueDependent()) { 508 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals); 509 } else if (!ArraySize->isIntegerConstantExpr(ConstVal, Context) || 510 (!T->isDependentType() && !T->isConstantSizeType())) { 511 // Per C99, a variable array is an array with either a non-constant 512 // size or an element type that has a non-constant-size 513 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals); 514 } else { 515 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 516 // have a value greater than zero. 517 if (ConstVal.isSigned()) { 518 if (ConstVal.isNegative()) { 519 Diag(ArraySize->getLocStart(), 520 diag::err_typecheck_negative_array_size) 521 << ArraySize->getSourceRange(); 522 return QualType(); 523 } else if (ConstVal == 0) { 524 // GCC accepts zero sized static arrays. 525 Diag(ArraySize->getLocStart(), diag::ext_typecheck_zero_array_size) 526 << ArraySize->getSourceRange(); 527 } 528 } 529 T = Context.getConstantArrayType(T, ConstVal, ASM, Quals); 530 } 531 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 532 if (!getLangOptions().C99) { 533 if (ArraySize && !ArraySize->isTypeDependent() && 534 !ArraySize->isValueDependent() && 535 !ArraySize->isIntegerConstantExpr(Context)) 536 Diag(Loc, diag::ext_vla); 537 else if (ASM != ArrayType::Normal || Quals != 0) 538 Diag(Loc, diag::ext_c99_array_usage); 539 } 540 541 return T; 542} 543 544/// \brief Build a function type. 545/// 546/// This routine checks the function type according to C++ rules and 547/// under the assumption that the result type and parameter types have 548/// just been instantiated from a template. It therefore duplicates 549/// some of the behavior of GetTypeForDeclarator, but in a much 550/// simpler form that is only suitable for this narrow use case. 551/// 552/// \param T The return type of the function. 553/// 554/// \param ParamTypes The parameter types of the function. This array 555/// will be modified to account for adjustments to the types of the 556/// function parameters. 557/// 558/// \param NumParamTypes The number of parameter types in ParamTypes. 559/// 560/// \param Variadic Whether this is a variadic function type. 561/// 562/// \param Quals The cvr-qualifiers to be applied to the function type. 563/// 564/// \param Loc The location of the entity whose type involves this 565/// function type or, if there is no such entity, the location of the 566/// type that will have function type. 567/// 568/// \param Entity The name of the entity that involves the function 569/// type, if known. 570/// 571/// \returns A suitable function type, if there are no 572/// errors. Otherwise, returns a NULL type. 573QualType Sema::BuildFunctionType(QualType T, 574 QualType *ParamTypes, 575 unsigned NumParamTypes, 576 bool Variadic, unsigned Quals, 577 SourceLocation Loc, DeclarationName Entity) { 578 if (T->isArrayType() || T->isFunctionType()) { 579 Diag(Loc, diag::err_func_returning_array_function) << T; 580 return QualType(); 581 } 582 583 bool Invalid = false; 584 for (unsigned Idx = 0; Idx < NumParamTypes; ++Idx) { 585 QualType ParamType = adjustParameterType(ParamTypes[Idx]); 586 if (ParamType->isVoidType()) { 587 Diag(Loc, diag::err_param_with_void_type); 588 Invalid = true; 589 } 590 591 ParamTypes[Idx] = ParamType; 592 } 593 594 if (Invalid) 595 return QualType(); 596 597 return Context.getFunctionType(T, ParamTypes, NumParamTypes, Variadic, 598 Quals); 599} 600 601/// GetTypeForDeclarator - Convert the type for the specified 602/// declarator to Type instances. Skip the outermost Skip type 603/// objects. 604QualType Sema::GetTypeForDeclarator(Declarator &D, Scope *S, unsigned Skip) { 605 bool OmittedReturnType = false; 606 607 if (D.getContext() == Declarator::BlockLiteralContext 608 && Skip == 0 609 && !D.getDeclSpec().hasTypeSpecifier() 610 && (D.getNumTypeObjects() == 0 611 || (D.getNumTypeObjects() == 1 612 && D.getTypeObject(0).Kind == DeclaratorChunk::Function))) 613 OmittedReturnType = true; 614 615 // long long is a C99 feature. 616 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 617 D.getDeclSpec().getTypeSpecWidth() == DeclSpec::TSW_longlong) 618 Diag(D.getDeclSpec().getTypeSpecWidthLoc(), diag::ext_longlong); 619 620 // Determine the type of the declarator. Not all forms of declarator 621 // have a type. 622 QualType T; 623 switch (D.getKind()) { 624 case Declarator::DK_Abstract: 625 case Declarator::DK_Normal: 626 case Declarator::DK_Operator: { 627 const DeclSpec &DS = D.getDeclSpec(); 628 if (OmittedReturnType) { 629 // We default to a dependent type initially. Can be modified by 630 // the first return statement. 631 T = Context.DependentTy; 632 } else { 633 bool isInvalid = false; 634 T = ConvertDeclSpecToType(DS, D.getIdentifierLoc(), isInvalid); 635 if (isInvalid) 636 D.setInvalidType(true); 637 } 638 break; 639 } 640 641 case Declarator::DK_Constructor: 642 case Declarator::DK_Destructor: 643 case Declarator::DK_Conversion: 644 // Constructors and destructors don't have return types. Use 645 // "void" instead. Conversion operators will check their return 646 // types separately. 647 T = Context.VoidTy; 648 break; 649 } 650 651 // The name we're declaring, if any. 652 DeclarationName Name; 653 if (D.getIdentifier()) 654 Name = D.getIdentifier(); 655 656 // Walk the DeclTypeInfo, building the recursive type as we go. 657 // DeclTypeInfos are ordered from the identifier out, which is 658 // opposite of what we want :). 659 for (unsigned i = Skip, e = D.getNumTypeObjects(); i != e; ++i) { 660 DeclaratorChunk &DeclType = D.getTypeObject(e-i-1+Skip); 661 switch (DeclType.Kind) { 662 default: assert(0 && "Unknown decltype!"); 663 case DeclaratorChunk::BlockPointer: 664 // If blocks are disabled, emit an error. 665 if (!LangOpts.Blocks) 666 Diag(DeclType.Loc, diag::err_blocks_disable); 667 668 if (DeclType.Cls.TypeQuals) 669 Diag(D.getIdentifierLoc(), diag::err_qualified_block_pointer_type); 670 if (!T.getTypePtr()->isFunctionType()) 671 Diag(D.getIdentifierLoc(), diag::err_nonfunction_block_type); 672 else 673 T = Context.getBlockPointerType(T); 674 break; 675 case DeclaratorChunk::Pointer: 676 T = BuildPointerType(T, DeclType.Ptr.TypeQuals, DeclType.Loc, Name); 677 break; 678 case DeclaratorChunk::Reference: 679 T = BuildReferenceType(T, DeclType.Ref.LValueRef, 680 DeclType.Ref.HasRestrict ? QualType::Restrict : 0, 681 DeclType.Loc, Name); 682 break; 683 case DeclaratorChunk::Array: { 684 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 685 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 686 ArrayType::ArraySizeModifier ASM; 687 if (ATI.isStar) 688 ASM = ArrayType::Star; 689 else if (ATI.hasStatic) 690 ASM = ArrayType::Static; 691 else 692 ASM = ArrayType::Normal; 693 if (ASM == ArrayType::Star && 694 D.getContext() != Declarator::PrototypeContext) { 695 // FIXME: This check isn't quite right: it allows star in prototypes 696 // for function definitions, and disallows some edge cases detailed 697 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html 698 Diag(DeclType.Loc, diag::err_array_star_outside_prototype); 699 ASM = ArrayType::Normal; 700 D.setInvalidType(true); 701 } 702 T = BuildArrayType(T, ASM, ArraySize, ATI.TypeQuals, DeclType.Loc, Name); 703 break; 704 } 705 case DeclaratorChunk::Function: { 706 // If the function declarator has a prototype (i.e. it is not () and 707 // does not have a K&R-style identifier list), then the arguments are part 708 // of the type, otherwise the argument list is (). 709 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 710 711 // C99 6.7.5.3p1: The return type may not be a function or array type. 712 if (T->isArrayType() || T->isFunctionType()) { 713 Diag(DeclType.Loc, diag::err_func_returning_array_function) << T; 714 T = Context.IntTy; 715 D.setInvalidType(true); 716 } 717 718 if (FTI.NumArgs == 0) { 719 if (getLangOptions().CPlusPlus) { 720 // C++ 8.3.5p2: If the parameter-declaration-clause is empty, the 721 // function takes no arguments. 722 T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic,FTI.TypeQuals); 723 } else if (FTI.isVariadic) { 724 // We allow a zero-parameter variadic function in C if the 725 // function is marked with the "overloadable" 726 // attribute. Scan for this attribute now. 727 bool Overloadable = false; 728 for (const AttributeList *Attrs = D.getAttributes(); 729 Attrs; Attrs = Attrs->getNext()) { 730 if (Attrs->getKind() == AttributeList::AT_overloadable) { 731 Overloadable = true; 732 break; 733 } 734 } 735 736 if (!Overloadable) 737 Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); 738 T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic, 0); 739 } else { 740 // Simple void foo(), where the incoming T is the result type. 741 T = Context.getFunctionNoProtoType(T); 742 } 743 } else if (FTI.ArgInfo[0].Param == 0) { 744 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function definition. 745 Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 746 } else { 747 // Otherwise, we have a function with an argument list that is 748 // potentially variadic. 749 llvm::SmallVector<QualType, 16> ArgTys; 750 751 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 752 ParmVarDecl *Param = 753 cast<ParmVarDecl>(FTI.ArgInfo[i].Param.getAs<Decl>()); 754 QualType ArgTy = Param->getType(); 755 assert(!ArgTy.isNull() && "Couldn't parse type?"); 756 757 // Adjust the parameter type. 758 assert((ArgTy == adjustParameterType(ArgTy)) && "Unadjusted type?"); 759 760 // Look for 'void'. void is allowed only as a single argument to a 761 // function with no other parameters (C99 6.7.5.3p10). We record 762 // int(void) as a FunctionProtoType with an empty argument list. 763 if (ArgTy->isVoidType()) { 764 // If this is something like 'float(int, void)', reject it. 'void' 765 // is an incomplete type (C99 6.2.5p19) and function decls cannot 766 // have arguments of incomplete type. 767 if (FTI.NumArgs != 1 || FTI.isVariadic) { 768 Diag(DeclType.Loc, diag::err_void_only_param); 769 ArgTy = Context.IntTy; 770 Param->setType(ArgTy); 771 } else if (FTI.ArgInfo[i].Ident) { 772 // Reject, but continue to parse 'int(void abc)'. 773 Diag(FTI.ArgInfo[i].IdentLoc, 774 diag::err_param_with_void_type); 775 ArgTy = Context.IntTy; 776 Param->setType(ArgTy); 777 } else { 778 // Reject, but continue to parse 'float(const void)'. 779 if (ArgTy.getCVRQualifiers()) 780 Diag(DeclType.Loc, diag::err_void_param_qualified); 781 782 // Do not add 'void' to the ArgTys list. 783 break; 784 } 785 } else if (!FTI.hasPrototype) { 786 if (ArgTy->isPromotableIntegerType()) { 787 ArgTy = Context.IntTy; 788 } else if (const BuiltinType* BTy = ArgTy->getAsBuiltinType()) { 789 if (BTy->getKind() == BuiltinType::Float) 790 ArgTy = Context.DoubleTy; 791 } 792 } 793 794 ArgTys.push_back(ArgTy); 795 } 796 T = Context.getFunctionType(T, &ArgTys[0], ArgTys.size(), 797 FTI.isVariadic, FTI.TypeQuals); 798 } 799 break; 800 } 801 case DeclaratorChunk::MemberPointer: 802 // The scope spec must refer to a class, or be dependent. 803 DeclContext *DC = computeDeclContext(DeclType.Mem.Scope()); 804 QualType ClsType; 805 // FIXME: Extend for dependent types when it's actually supported. 806 // See ActOnCXXNestedNameSpecifier. 807 if (CXXRecordDecl *RD = dyn_cast_or_null<CXXRecordDecl>(DC)) { 808 ClsType = Context.getTagDeclType(RD); 809 } else { 810 if (DC) { 811 Diag(DeclType.Mem.Scope().getBeginLoc(), 812 diag::err_illegal_decl_mempointer_in_nonclass) 813 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 814 << DeclType.Mem.Scope().getRange(); 815 } 816 D.setInvalidType(true); 817 ClsType = Context.IntTy; 818 } 819 820 // C++ 8.3.3p3: A pointer to member shall not pointer to ... a member 821 // with reference type, or "cv void." 822 if (T->isReferenceType()) { 823 Diag(DeclType.Loc, diag::err_illegal_decl_pointer_to_reference) 824 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name"); 825 D.setInvalidType(true); 826 T = Context.IntTy; 827 } 828 if (T->isVoidType()) { 829 Diag(DeclType.Loc, diag::err_illegal_decl_mempointer_to_void) 830 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name"); 831 T = Context.IntTy; 832 } 833 834 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 835 // object or incomplete types shall not be restrict-qualified." 836 if ((DeclType.Mem.TypeQuals & QualType::Restrict) && 837 !T->isIncompleteOrObjectType()) { 838 Diag(DeclType.Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 839 << T; 840 DeclType.Mem.TypeQuals &= ~QualType::Restrict; 841 } 842 843 T = Context.getMemberPointerType(T, ClsType.getTypePtr()). 844 getQualifiedType(DeclType.Mem.TypeQuals); 845 846 break; 847 } 848 849 if (T.isNull()) { 850 D.setInvalidType(true); 851 T = Context.IntTy; 852 } 853 854 // See if there are any attributes on this declarator chunk. 855 if (const AttributeList *AL = DeclType.getAttrs()) 856 ProcessTypeAttributeList(T, AL); 857 } 858 859 if (getLangOptions().CPlusPlus && T->isFunctionType()) { 860 const FunctionProtoType *FnTy = T->getAsFunctionProtoType(); 861 assert(FnTy && "Why oh why is there not a FunctionProtoType here ?"); 862 863 // C++ 8.3.5p4: A cv-qualifier-seq shall only be part of the function type 864 // for a nonstatic member function, the function type to which a pointer 865 // to member refers, or the top-level function type of a function typedef 866 // declaration. 867 if (FnTy->getTypeQuals() != 0 && 868 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 869 ((D.getContext() != Declarator::MemberContext && 870 (!D.getCXXScopeSpec().isSet() || 871 !computeDeclContext(D.getCXXScopeSpec())->isRecord())) || 872 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static)) { 873 if (D.isFunctionDeclarator()) 874 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_function_type); 875 else 876 Diag(D.getIdentifierLoc(), 877 diag::err_invalid_qualified_typedef_function_type_use); 878 879 // Strip the cv-quals from the type. 880 T = Context.getFunctionType(FnTy->getResultType(), FnTy->arg_type_begin(), 881 FnTy->getNumArgs(), FnTy->isVariadic(), 0); 882 } 883 } 884 885 // If there were any type attributes applied to the decl itself (not the 886 // type, apply the type attribute to the type!) 887 if (const AttributeList *Attrs = D.getAttributes()) 888 ProcessTypeAttributeList(T, Attrs); 889 890 return T; 891} 892 893/// ObjCGetTypeForMethodDefinition - Builds the type for a method definition 894/// declarator 895QualType Sema::ObjCGetTypeForMethodDefinition(DeclPtrTy D) { 896 ObjCMethodDecl *MDecl = cast<ObjCMethodDecl>(D.getAs<Decl>()); 897 QualType T = MDecl->getResultType(); 898 llvm::SmallVector<QualType, 16> ArgTys; 899 900 // Add the first two invisible argument types for self and _cmd. 901 if (MDecl->isInstanceMethod()) { 902 QualType selfTy = Context.getObjCInterfaceType(MDecl->getClassInterface()); 903 selfTy = Context.getPointerType(selfTy); 904 ArgTys.push_back(selfTy); 905 } else 906 ArgTys.push_back(Context.getObjCIdType()); 907 ArgTys.push_back(Context.getObjCSelType()); 908 909 for (ObjCMethodDecl::param_iterator PI = MDecl->param_begin(), 910 E = MDecl->param_end(); PI != E; ++PI) { 911 QualType ArgTy = (*PI)->getType(); 912 assert(!ArgTy.isNull() && "Couldn't parse type?"); 913 ArgTy = adjustParameterType(ArgTy); 914 ArgTys.push_back(ArgTy); 915 } 916 T = Context.getFunctionType(T, &ArgTys[0], ArgTys.size(), 917 MDecl->isVariadic(), 0); 918 return T; 919} 920 921/// UnwrapSimilarPointerTypes - If T1 and T2 are pointer types that 922/// may be similar (C++ 4.4), replaces T1 and T2 with the type that 923/// they point to and return true. If T1 and T2 aren't pointer types 924/// or pointer-to-member types, or if they are not similar at this 925/// level, returns false and leaves T1 and T2 unchanged. Top-level 926/// qualifiers on T1 and T2 are ignored. This function will typically 927/// be called in a loop that successively "unwraps" pointer and 928/// pointer-to-member types to compare them at each level. 929bool Sema::UnwrapSimilarPointerTypes(QualType& T1, QualType& T2) { 930 const PointerType *T1PtrType = T1->getAsPointerType(), 931 *T2PtrType = T2->getAsPointerType(); 932 if (T1PtrType && T2PtrType) { 933 T1 = T1PtrType->getPointeeType(); 934 T2 = T2PtrType->getPointeeType(); 935 return true; 936 } 937 938 const MemberPointerType *T1MPType = T1->getAsMemberPointerType(), 939 *T2MPType = T2->getAsMemberPointerType(); 940 if (T1MPType && T2MPType && 941 Context.getCanonicalType(T1MPType->getClass()) == 942 Context.getCanonicalType(T2MPType->getClass())) { 943 T1 = T1MPType->getPointeeType(); 944 T2 = T2MPType->getPointeeType(); 945 return true; 946 } 947 return false; 948} 949 950Sema::TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 951 // C99 6.7.6: Type names have no identifier. This is already validated by 952 // the parser. 953 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 954 955 QualType T = GetTypeForDeclarator(D, S); 956 if (D.isInvalidType()) 957 return true; 958 959 // Check that there are no default arguments (C++ only). 960 if (getLangOptions().CPlusPlus) 961 CheckExtraCXXDefaultArguments(D); 962 963 return T.getAsOpaquePtr(); 964} 965 966 967 968//===----------------------------------------------------------------------===// 969// Type Attribute Processing 970//===----------------------------------------------------------------------===// 971 972/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 973/// specified type. The attribute contains 1 argument, the id of the address 974/// space for the type. 975static void HandleAddressSpaceTypeAttribute(QualType &Type, 976 const AttributeList &Attr, Sema &S){ 977 // If this type is already address space qualified, reject it. 978 // Clause 6.7.3 - Type qualifiers: "No type shall be qualified by qualifiers 979 // for two or more different address spaces." 980 if (Type.getAddressSpace()) { 981 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 982 return; 983 } 984 985 // Check the attribute arguments. 986 if (Attr.getNumArgs() != 1) { 987 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 988 return; 989 } 990 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 991 llvm::APSInt addrSpace(32); 992 if (!ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 993 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 994 << ASArgExpr->getSourceRange(); 995 return; 996 } 997 998 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 999 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 1000} 1001 1002/// HandleObjCGCTypeAttribute - Process an objc's gc attribute on the 1003/// specified type. The attribute contains 1 argument, weak or strong. 1004static void HandleObjCGCTypeAttribute(QualType &Type, 1005 const AttributeList &Attr, Sema &S) { 1006 if (Type.getObjCGCAttr() != QualType::GCNone) { 1007 S.Diag(Attr.getLoc(), diag::err_attribute_multiple_objc_gc); 1008 return; 1009 } 1010 1011 // Check the attribute arguments. 1012 if (!Attr.getParameterName()) { 1013 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) 1014 << "objc_gc" << 1; 1015 return; 1016 } 1017 QualType::GCAttrTypes GCAttr; 1018 if (Attr.getNumArgs() != 0) { 1019 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1020 return; 1021 } 1022 if (Attr.getParameterName()->isStr("weak")) 1023 GCAttr = QualType::Weak; 1024 else if (Attr.getParameterName()->isStr("strong")) 1025 GCAttr = QualType::Strong; 1026 else { 1027 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported) 1028 << "objc_gc" << Attr.getParameterName(); 1029 return; 1030 } 1031 1032 Type = S.Context.getObjCGCQualType(Type, GCAttr); 1033} 1034 1035void Sema::ProcessTypeAttributeList(QualType &Result, const AttributeList *AL) { 1036 // Scan through and apply attributes to this type where it makes sense. Some 1037 // attributes (such as __address_space__, __vector_size__, etc) apply to the 1038 // type, but others can be present in the type specifiers even though they 1039 // apply to the decl. Here we apply type attributes and ignore the rest. 1040 for (; AL; AL = AL->getNext()) { 1041 // If this is an attribute we can handle, do so now, otherwise, add it to 1042 // the LeftOverAttrs list for rechaining. 1043 switch (AL->getKind()) { 1044 default: break; 1045 case AttributeList::AT_address_space: 1046 HandleAddressSpaceTypeAttribute(Result, *AL, *this); 1047 break; 1048 case AttributeList::AT_objc_gc: 1049 HandleObjCGCTypeAttribute(Result, *AL, *this); 1050 break; 1051 } 1052 } 1053} 1054 1055/// @brief Ensure that the type T is a complete type. 1056/// 1057/// This routine checks whether the type @p T is complete in any 1058/// context where a complete type is required. If @p T is a complete 1059/// type, returns false. If @p T is a class template specialization, 1060/// this routine then attempts to perform class template 1061/// instantiation. If instantiation fails, or if @p T is incomplete 1062/// and cannot be completed, issues the diagnostic @p diag (giving it 1063/// the type @p T) and returns true. 1064/// 1065/// @param Loc The location in the source that the incomplete type 1066/// diagnostic should refer to. 1067/// 1068/// @param T The type that this routine is examining for completeness. 1069/// 1070/// @param diag The diagnostic value (e.g., 1071/// @c diag::err_typecheck_decl_incomplete_type) that will be used 1072/// for the error message if @p T is incomplete. 1073/// 1074/// @param Range1 An optional range in the source code that will be a 1075/// part of the "incomplete type" error message. 1076/// 1077/// @param Range2 An optional range in the source code that will be a 1078/// part of the "incomplete type" error message. 1079/// 1080/// @param PrintType If non-NULL, the type that should be printed 1081/// instead of @p T. This parameter should be used when the type that 1082/// we're checking for incompleteness isn't the type that should be 1083/// displayed to the user, e.g., when T is a type and PrintType is a 1084/// pointer to T. 1085/// 1086/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 1087/// @c false otherwise. 1088bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, unsigned diag, 1089 SourceRange Range1, SourceRange Range2, 1090 QualType PrintType) { 1091 // If we have a complete type, we're done. 1092 if (!T->isIncompleteType()) 1093 return false; 1094 1095 // If we have a class template specialization or a class member of a 1096 // class template specialization, try to instantiate it. 1097 if (const RecordType *Record = T->getAsRecordType()) { 1098 if (ClassTemplateSpecializationDecl *ClassTemplateSpec 1099 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { 1100 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) { 1101 // Update the class template specialization's location to 1102 // refer to the point of instantiation. 1103 if (Loc.isValid()) 1104 ClassTemplateSpec->setLocation(Loc); 1105 return InstantiateClassTemplateSpecialization(ClassTemplateSpec, 1106 /*ExplicitInstantiation=*/false); 1107 } 1108 } else if (CXXRecordDecl *Rec 1109 = dyn_cast<CXXRecordDecl>(Record->getDecl())) { 1110 if (CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass()) { 1111 // Find the class template specialization that surrounds this 1112 // member class. 1113 ClassTemplateSpecializationDecl *Spec = 0; 1114 for (DeclContext *Parent = Rec->getDeclContext(); 1115 Parent && !Spec; Parent = Parent->getParent()) 1116 Spec = dyn_cast<ClassTemplateSpecializationDecl>(Parent); 1117 assert(Spec && "Not a member of a class template specialization?"); 1118 return InstantiateClass(Loc, Rec, Pattern, 1119 Spec->getTemplateArgs(), 1120 Spec->getNumTemplateArgs()); 1121 } 1122 } 1123 } 1124 1125 if (PrintType.isNull()) 1126 PrintType = T; 1127 1128 // We have an incomplete type. Produce a diagnostic. 1129 Diag(Loc, diag) << PrintType << Range1 << Range2; 1130 1131 // If the type was a forward declaration of a class/struct/union 1132 // type, produce 1133 const TagType *Tag = 0; 1134 if (const RecordType *Record = T->getAsRecordType()) 1135 Tag = Record; 1136 else if (const EnumType *Enum = T->getAsEnumType()) 1137 Tag = Enum; 1138 1139 if (Tag && !Tag->getDecl()->isInvalidDecl()) 1140 Diag(Tag->getDecl()->getLocation(), 1141 Tag->isBeingDefined() ? diag::note_type_being_defined 1142 : diag::note_forward_declaration) 1143 << QualType(Tag, 0); 1144 1145 return true; 1146} 1147 1148/// \brief Retrieve a version of the type 'T' that is qualified by the 1149/// nested-name-specifier contained in SS. 1150QualType Sema::getQualifiedNameType(const CXXScopeSpec &SS, QualType T) { 1151 if (!SS.isSet() || SS.isInvalid() || T.isNull()) 1152 return T; 1153 1154 NestedNameSpecifier *NNS 1155 = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 1156 return Context.getQualifiedNameType(NNS, T); 1157} 1158