SemaType.cpp revision 4adab7fcb4cb1e23622f4849f7ef7981ff169616
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 "SemaInherit.h" 16#include "clang/AST/ASTContext.h" 17#include "clang/AST/DeclObjC.h" 18#include "clang/AST/DeclTemplate.h" 19#include "clang/AST/TypeLoc.h" 20#include "clang/AST/Expr.h" 21#include "clang/Parse/DeclSpec.h" 22#include "llvm/ADT/SmallPtrSet.h" 23using namespace clang; 24 25/// \brief Perform adjustment on the parameter type of a function. 26/// 27/// This routine adjusts the given parameter type @p T to the actual 28/// parameter type used by semantic analysis (C99 6.7.5.3p[7,8], 29/// C++ [dcl.fct]p3). The adjusted parameter type is returned. 30QualType Sema::adjustParameterType(QualType T) { 31 // C99 6.7.5.3p7: 32 if (T->isArrayType()) { 33 // C99 6.7.5.3p7: 34 // A declaration of a parameter as "array of type" shall be 35 // adjusted to "qualified pointer to type", where the type 36 // qualifiers (if any) are those specified within the [ and ] of 37 // the array type derivation. 38 return Context.getArrayDecayedType(T); 39 } else if (T->isFunctionType()) 40 // C99 6.7.5.3p8: 41 // A declaration of a parameter as "function returning type" 42 // shall be adjusted to "pointer to function returning type", as 43 // in 6.3.2.1. 44 return Context.getPointerType(T); 45 46 return T; 47} 48 49/// \brief Convert the specified declspec to the appropriate type 50/// object. 51/// \param DS the declaration specifiers 52/// \param DeclLoc The location of the declarator identifier or invalid if none. 53/// \returns The type described by the declaration specifiers. This function 54/// never returns null. 55QualType Sema::ConvertDeclSpecToType(const DeclSpec &DS, 56 SourceLocation DeclLoc, 57 bool &isInvalid) { 58 // FIXME: Should move the logic from DeclSpec::Finish to here for validity 59 // checking. 60 QualType Result; 61 62 switch (DS.getTypeSpecType()) { 63 case DeclSpec::TST_void: 64 Result = Context.VoidTy; 65 break; 66 case DeclSpec::TST_char: 67 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 68 Result = Context.CharTy; 69 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) 70 Result = Context.SignedCharTy; 71 else { 72 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 73 "Unknown TSS value"); 74 Result = Context.UnsignedCharTy; 75 } 76 break; 77 case DeclSpec::TST_wchar: 78 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 79 Result = Context.WCharTy; 80 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) { 81 Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 82 << DS.getSpecifierName(DS.getTypeSpecType()); 83 Result = Context.getSignedWCharType(); 84 } else { 85 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 86 "Unknown TSS value"); 87 Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 88 << DS.getSpecifierName(DS.getTypeSpecType()); 89 Result = Context.getUnsignedWCharType(); 90 } 91 break; 92 case DeclSpec::TST_char16: 93 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 94 "Unknown TSS value"); 95 Result = Context.Char16Ty; 96 break; 97 case DeclSpec::TST_char32: 98 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 99 "Unknown TSS value"); 100 Result = Context.Char32Ty; 101 break; 102 case DeclSpec::TST_unspecified: 103 // "<proto1,proto2>" is an objc qualified ID with a missing id. 104 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 105 Result = Context.getObjCObjectPointerType(Context.ObjCBuiltinIdTy, 106 (ObjCProtocolDecl**)PQ, 107 DS.getNumProtocolQualifiers()); 108 break; 109 } 110 111 // Unspecified typespec defaults to int in C90. However, the C90 grammar 112 // [C90 6.5] only allows a decl-spec if there was *some* type-specifier, 113 // type-qualifier, or storage-class-specifier. If not, emit an extwarn. 114 // Note that the one exception to this is function definitions, which are 115 // allowed to be completely missing a declspec. This is handled in the 116 // parser already though by it pretending to have seen an 'int' in this 117 // case. 118 if (getLangOptions().ImplicitInt) { 119 // In C89 mode, we only warn if there is a completely missing declspec 120 // when one is not allowed. 121 if (DS.isEmpty()) { 122 if (DeclLoc.isInvalid()) 123 DeclLoc = DS.getSourceRange().getBegin(); 124 Diag(DeclLoc, diag::ext_missing_declspec) 125 << DS.getSourceRange() 126 << CodeModificationHint::CreateInsertion(DS.getSourceRange().getBegin(), 127 "int"); 128 } 129 } else if (!DS.hasTypeSpecifier()) { 130 // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says: 131 // "At least one type specifier shall be given in the declaration 132 // specifiers in each declaration, and in the specifier-qualifier list in 133 // each struct declaration and type name." 134 // FIXME: Does Microsoft really have the implicit int extension in C++? 135 if (DeclLoc.isInvalid()) 136 DeclLoc = DS.getSourceRange().getBegin(); 137 138 if (getLangOptions().CPlusPlus && !getLangOptions().Microsoft) { 139 Diag(DeclLoc, diag::err_missing_type_specifier) 140 << DS.getSourceRange(); 141 142 // When this occurs in C++ code, often something is very broken with the 143 // value being declared, poison it as invalid so we don't get chains of 144 // errors. 145 isInvalid = true; 146 } else { 147 Diag(DeclLoc, diag::ext_missing_type_specifier) 148 << DS.getSourceRange(); 149 } 150 } 151 152 // FALL THROUGH. 153 case DeclSpec::TST_int: { 154 if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) { 155 switch (DS.getTypeSpecWidth()) { 156 case DeclSpec::TSW_unspecified: Result = Context.IntTy; break; 157 case DeclSpec::TSW_short: Result = Context.ShortTy; break; 158 case DeclSpec::TSW_long: Result = Context.LongTy; break; 159 case DeclSpec::TSW_longlong: Result = Context.LongLongTy; break; 160 } 161 } else { 162 switch (DS.getTypeSpecWidth()) { 163 case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break; 164 case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break; 165 case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break; 166 case DeclSpec::TSW_longlong: Result =Context.UnsignedLongLongTy; break; 167 } 168 } 169 break; 170 } 171 case DeclSpec::TST_float: Result = Context.FloatTy; break; 172 case DeclSpec::TST_double: 173 if (DS.getTypeSpecWidth() == DeclSpec::TSW_long) 174 Result = Context.LongDoubleTy; 175 else 176 Result = Context.DoubleTy; 177 break; 178 case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool 179 case DeclSpec::TST_decimal32: // _Decimal32 180 case DeclSpec::TST_decimal64: // _Decimal64 181 case DeclSpec::TST_decimal128: // _Decimal128 182 Diag(DS.getTypeSpecTypeLoc(), diag::err_decimal_unsupported); 183 Result = Context.IntTy; 184 isInvalid = true; 185 break; 186 case DeclSpec::TST_class: 187 case DeclSpec::TST_enum: 188 case DeclSpec::TST_union: 189 case DeclSpec::TST_struct: { 190 Decl *D = static_cast<Decl *>(DS.getTypeRep()); 191 assert(D && "Didn't get a decl for a class/enum/union/struct?"); 192 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 193 DS.getTypeSpecSign() == 0 && 194 "Can't handle qualifiers on typedef names yet!"); 195 // TypeQuals handled by caller. 196 Result = Context.getTypeDeclType(cast<TypeDecl>(D)); 197 198 if (D->isInvalidDecl()) 199 isInvalid = true; 200 break; 201 } 202 case DeclSpec::TST_typename: { 203 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 204 DS.getTypeSpecSign() == 0 && 205 "Can't handle qualifiers on typedef names yet!"); 206 Result = QualType::getFromOpaquePtr(DS.getTypeRep()); 207 208 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 209 if (const ObjCInterfaceType *Interface = Result->getAsObjCInterfaceType()) 210 // It would be nice if protocol qualifiers were only stored with the 211 // ObjCObjectPointerType. Unfortunately, this isn't possible due 212 // to the following typedef idiom (which is uncommon, but allowed): 213 // 214 // typedef Foo<P> T; 215 // static void func() { 216 // Foo<P> *yy; 217 // T *zz; 218 // } 219 Result = Context.getObjCInterfaceType(Interface->getDecl(), 220 (ObjCProtocolDecl**)PQ, 221 DS.getNumProtocolQualifiers()); 222 else if (Result->isObjCIdType()) 223 // id<protocol-list> 224 Result = Context.getObjCObjectPointerType(Context.ObjCBuiltinIdTy, 225 (ObjCProtocolDecl**)PQ, DS.getNumProtocolQualifiers()); 226 else if (Result->isObjCClassType()) { 227 if (DeclLoc.isInvalid()) 228 DeclLoc = DS.getSourceRange().getBegin(); 229 // Class<protocol-list> 230 Result = Context.getObjCObjectPointerType(Context.ObjCBuiltinClassTy, 231 (ObjCProtocolDecl**)PQ, DS.getNumProtocolQualifiers()); 232 } else { 233 if (DeclLoc.isInvalid()) 234 DeclLoc = DS.getSourceRange().getBegin(); 235 Diag(DeclLoc, diag::err_invalid_protocol_qualifiers) 236 << DS.getSourceRange(); 237 isInvalid = true; 238 } 239 } 240 241 // If this is a reference to an invalid typedef, propagate the invalidity. 242 if (TypedefType *TDT = dyn_cast<TypedefType>(Result)) 243 if (TDT->getDecl()->isInvalidDecl()) 244 isInvalid = true; 245 246 // TypeQuals handled by caller. 247 break; 248 } 249 case DeclSpec::TST_typeofType: 250 Result = QualType::getFromOpaquePtr(DS.getTypeRep()); 251 assert(!Result.isNull() && "Didn't get a type for typeof?"); 252 // TypeQuals handled by caller. 253 Result = Context.getTypeOfType(Result); 254 break; 255 case DeclSpec::TST_typeofExpr: { 256 Expr *E = static_cast<Expr *>(DS.getTypeRep()); 257 assert(E && "Didn't get an expression for typeof?"); 258 // TypeQuals handled by caller. 259 Result = Context.getTypeOfExprType(E); 260 break; 261 } 262 case DeclSpec::TST_decltype: { 263 Expr *E = static_cast<Expr *>(DS.getTypeRep()); 264 assert(E && "Didn't get an expression for decltype?"); 265 // TypeQuals handled by caller. 266 Result = BuildDecltypeType(E); 267 if (Result.isNull()) { 268 Result = Context.IntTy; 269 isInvalid = true; 270 } 271 break; 272 } 273 case DeclSpec::TST_auto: { 274 // TypeQuals handled by caller. 275 Result = Context.UndeducedAutoTy; 276 break; 277 } 278 279 case DeclSpec::TST_error: 280 Result = Context.IntTy; 281 isInvalid = true; 282 break; 283 } 284 285 // Handle complex types. 286 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) { 287 if (getLangOptions().Freestanding) 288 Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex); 289 Result = Context.getComplexType(Result); 290 } 291 292 assert(DS.getTypeSpecComplex() != DeclSpec::TSC_imaginary && 293 "FIXME: imaginary types not supported yet!"); 294 295 // See if there are any attributes on the declspec that apply to the type (as 296 // opposed to the decl). 297 if (const AttributeList *AL = DS.getAttributes()) 298 ProcessTypeAttributeList(Result, AL); 299 300 // Apply const/volatile/restrict qualifiers to T. 301 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 302 303 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 304 // or incomplete types shall not be restrict-qualified." C++ also allows 305 // restrict-qualified references. 306 if (TypeQuals & QualType::Restrict) { 307 if (Result->isPointerType() || Result->isReferenceType()) { 308 QualType EltTy = Result->isPointerType() ? 309 Result->getAs<PointerType>()->getPointeeType() : 310 Result->getAs<ReferenceType>()->getPointeeType(); 311 312 // If we have a pointer or reference, the pointee must have an object 313 // incomplete type. 314 if (!EltTy->isIncompleteOrObjectType()) { 315 Diag(DS.getRestrictSpecLoc(), 316 diag::err_typecheck_invalid_restrict_invalid_pointee) 317 << EltTy << DS.getSourceRange(); 318 TypeQuals &= ~QualType::Restrict; // Remove the restrict qualifier. 319 } 320 } else { 321 Diag(DS.getRestrictSpecLoc(), 322 diag::err_typecheck_invalid_restrict_not_pointer) 323 << Result << DS.getSourceRange(); 324 TypeQuals &= ~QualType::Restrict; // Remove the restrict qualifier. 325 } 326 } 327 328 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification 329 // of a function type includes any type qualifiers, the behavior is 330 // undefined." 331 if (Result->isFunctionType() && TypeQuals) { 332 // Get some location to point at, either the C or V location. 333 SourceLocation Loc; 334 if (TypeQuals & QualType::Const) 335 Loc = DS.getConstSpecLoc(); 336 else { 337 assert((TypeQuals & QualType::Volatile) && 338 "Has CV quals but not C or V?"); 339 Loc = DS.getVolatileSpecLoc(); 340 } 341 Diag(Loc, diag::warn_typecheck_function_qualifiers) 342 << Result << DS.getSourceRange(); 343 } 344 345 // C++ [dcl.ref]p1: 346 // Cv-qualified references are ill-formed except when the 347 // cv-qualifiers are introduced through the use of a typedef 348 // (7.1.3) or of a template type argument (14.3), in which 349 // case the cv-qualifiers are ignored. 350 // FIXME: Shouldn't we be checking SCS_typedef here? 351 if (DS.getTypeSpecType() == DeclSpec::TST_typename && 352 TypeQuals && Result->isReferenceType()) { 353 TypeQuals &= ~QualType::Const; 354 TypeQuals &= ~QualType::Volatile; 355 } 356 357 Result = Result.getQualifiedType(TypeQuals); 358 } 359 return Result; 360} 361 362static std::string getPrintableNameForEntity(DeclarationName Entity) { 363 if (Entity) 364 return Entity.getAsString(); 365 366 return "type name"; 367} 368 369/// \brief Build a pointer type. 370/// 371/// \param T The type to which we'll be building a pointer. 372/// 373/// \param Quals The cvr-qualifiers to be applied to the pointer type. 374/// 375/// \param Loc The location of the entity whose type involves this 376/// pointer type or, if there is no such entity, the location of the 377/// type that will have pointer type. 378/// 379/// \param Entity The name of the entity that involves the pointer 380/// type, if known. 381/// 382/// \returns A suitable pointer type, if there are no 383/// errors. Otherwise, returns a NULL type. 384QualType Sema::BuildPointerType(QualType T, unsigned Quals, 385 SourceLocation Loc, DeclarationName Entity) { 386 if (T->isReferenceType()) { 387 // C++ 8.3.2p4: There shall be no ... pointers to references ... 388 Diag(Loc, diag::err_illegal_decl_pointer_to_reference) 389 << getPrintableNameForEntity(Entity); 390 return QualType(); 391 } 392 393 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 394 // object or incomplete types shall not be restrict-qualified." 395 if ((Quals & QualType::Restrict) && !T->isIncompleteOrObjectType()) { 396 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 397 << T; 398 Quals &= ~QualType::Restrict; 399 } 400 401 // Build the pointer type. 402 return Context.getPointerType(T).getQualifiedType(Quals); 403} 404 405/// \brief Build a reference type. 406/// 407/// \param T The type to which we'll be building a reference. 408/// 409/// \param Quals The cvr-qualifiers to be applied to the reference type. 410/// 411/// \param Loc The location of the entity whose type involves this 412/// reference type or, if there is no such entity, the location of the 413/// type that will have reference type. 414/// 415/// \param Entity The name of the entity that involves the reference 416/// type, if known. 417/// 418/// \returns A suitable reference type, if there are no 419/// errors. Otherwise, returns a NULL type. 420QualType Sema::BuildReferenceType(QualType T, bool LValueRef, unsigned Quals, 421 SourceLocation Loc, DeclarationName Entity) { 422 if (LValueRef) { 423 if (const RValueReferenceType *R = T->getAs<RValueReferenceType>()) { 424 // C++0x [dcl.typedef]p9: If a typedef TD names a type that is a 425 // reference to a type T, and attempt to create the type "lvalue 426 // reference to cv TD" creates the type "lvalue reference to T". 427 // We use the qualifiers (restrict or none) of the original reference, 428 // not the new ones. This is consistent with GCC. 429 return Context.getLValueReferenceType(R->getPointeeType()). 430 getQualifiedType(T.getCVRQualifiers()); 431 } 432 } 433 if (T->isReferenceType()) { 434 // C++ [dcl.ref]p4: There shall be no references to references. 435 // 436 // According to C++ DR 106, references to references are only 437 // diagnosed when they are written directly (e.g., "int & &"), 438 // but not when they happen via a typedef: 439 // 440 // typedef int& intref; 441 // typedef intref& intref2; 442 // 443 // Parser::ParserDeclaratorInternal diagnoses the case where 444 // references are written directly; here, we handle the 445 // collapsing of references-to-references as described in C++ 446 // DR 106 and amended by C++ DR 540. 447 return T; 448 } 449 450 // C++ [dcl.ref]p1: 451 // A declarator that specifies the type "reference to cv void" 452 // is ill-formed. 453 if (T->isVoidType()) { 454 Diag(Loc, diag::err_reference_to_void); 455 return QualType(); 456 } 457 458 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 459 // object or incomplete types shall not be restrict-qualified." 460 if ((Quals & QualType::Restrict) && !T->isIncompleteOrObjectType()) { 461 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 462 << T; 463 Quals &= ~QualType::Restrict; 464 } 465 466 // C++ [dcl.ref]p1: 467 // [...] Cv-qualified references are ill-formed except when the 468 // cv-qualifiers are introduced through the use of a typedef 469 // (7.1.3) or of a template type argument (14.3), in which case 470 // the cv-qualifiers are ignored. 471 // 472 // We diagnose extraneous cv-qualifiers for the non-typedef, 473 // non-template type argument case within the parser. Here, we just 474 // ignore any extraneous cv-qualifiers. 475 Quals &= ~QualType::Const; 476 Quals &= ~QualType::Volatile; 477 478 // Handle restrict on references. 479 if (LValueRef) 480 return Context.getLValueReferenceType(T).getQualifiedType(Quals); 481 return Context.getRValueReferenceType(T).getQualifiedType(Quals); 482} 483 484/// \brief Build an array type. 485/// 486/// \param T The type of each element in the array. 487/// 488/// \param ASM C99 array size modifier (e.g., '*', 'static'). 489/// 490/// \param ArraySize Expression describing the size of the array. 491/// 492/// \param Quals The cvr-qualifiers to be applied to the array's 493/// element type. 494/// 495/// \param Loc The location of the entity whose type involves this 496/// array type or, if there is no such entity, the location of the 497/// type that will have array type. 498/// 499/// \param Entity The name of the entity that involves the array 500/// type, if known. 501/// 502/// \returns A suitable array type, if there are no errors. Otherwise, 503/// returns a NULL type. 504QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM, 505 Expr *ArraySize, unsigned Quals, 506 SourceRange Brackets, DeclarationName Entity) { 507 SourceLocation Loc = Brackets.getBegin(); 508 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 509 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 510 if (RequireCompleteType(Loc, T, 511 diag::err_illegal_decl_array_incomplete_type)) 512 return QualType(); 513 514 if (T->isFunctionType()) { 515 Diag(Loc, diag::err_illegal_decl_array_of_functions) 516 << getPrintableNameForEntity(Entity); 517 return QualType(); 518 } 519 520 // C++ 8.3.2p4: There shall be no ... arrays of references ... 521 if (T->isReferenceType()) { 522 Diag(Loc, diag::err_illegal_decl_array_of_references) 523 << getPrintableNameForEntity(Entity); 524 return QualType(); 525 } 526 527 if (Context.getCanonicalType(T) == Context.UndeducedAutoTy) { 528 Diag(Loc, diag::err_illegal_decl_array_of_auto) 529 << getPrintableNameForEntity(Entity); 530 return QualType(); 531 } 532 533 if (const RecordType *EltTy = T->getAs<RecordType>()) { 534 // If the element type is a struct or union that contains a variadic 535 // array, accept it as a GNU extension: C99 6.7.2.1p2. 536 if (EltTy->getDecl()->hasFlexibleArrayMember()) 537 Diag(Loc, diag::ext_flexible_array_in_array) << T; 538 } else if (T->isObjCInterfaceType()) { 539 Diag(Loc, diag::err_objc_array_of_interfaces) << T; 540 return QualType(); 541 } 542 543 // C99 6.7.5.2p1: The size expression shall have integer type. 544 if (ArraySize && !ArraySize->isTypeDependent() && 545 !ArraySize->getType()->isIntegerType()) { 546 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 547 << ArraySize->getType() << ArraySize->getSourceRange(); 548 ArraySize->Destroy(Context); 549 return QualType(); 550 } 551 llvm::APSInt ConstVal(32); 552 if (!ArraySize) { 553 if (ASM == ArrayType::Star) 554 T = Context.getVariableArrayType(T, 0, ASM, Quals, Brackets); 555 else 556 T = Context.getIncompleteArrayType(T, ASM, Quals); 557 } else if (ArraySize->isValueDependent()) { 558 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets); 559 } else if (!ArraySize->isIntegerConstantExpr(ConstVal, Context) || 560 (!T->isDependentType() && !T->isConstantSizeType())) { 561 // Per C99, a variable array is an array with either a non-constant 562 // size or an element type that has a non-constant-size 563 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets); 564 } else { 565 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 566 // have a value greater than zero. 567 if (ConstVal.isSigned()) { 568 if (ConstVal.isNegative()) { 569 Diag(ArraySize->getLocStart(), 570 diag::err_typecheck_negative_array_size) 571 << ArraySize->getSourceRange(); 572 return QualType(); 573 } else if (ConstVal == 0) { 574 // GCC accepts zero sized static arrays. 575 Diag(ArraySize->getLocStart(), diag::ext_typecheck_zero_array_size) 576 << ArraySize->getSourceRange(); 577 } 578 } 579 T = Context.getConstantArrayWithExprType(T, ConstVal, ArraySize, 580 ASM, Quals, Brackets); 581 } 582 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 583 if (!getLangOptions().C99) { 584 if (ArraySize && !ArraySize->isTypeDependent() && 585 !ArraySize->isValueDependent() && 586 !ArraySize->isIntegerConstantExpr(Context)) 587 Diag(Loc, diag::ext_vla); 588 else if (ASM != ArrayType::Normal || Quals != 0) 589 Diag(Loc, diag::ext_c99_array_usage); 590 } 591 592 return T; 593} 594 595/// \brief Build an ext-vector type. 596/// 597/// Run the required checks for the extended vector type. 598QualType Sema::BuildExtVectorType(QualType T, ExprArg ArraySize, 599 SourceLocation AttrLoc) { 600 601 Expr *Arg = (Expr *)ArraySize.get(); 602 603 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 604 // in conjunction with complex types (pointers, arrays, functions, etc.). 605 if (!T->isDependentType() && 606 !T->isIntegerType() && !T->isRealFloatingType()) { 607 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T; 608 return QualType(); 609 } 610 611 if (!Arg->isTypeDependent() && !Arg->isValueDependent()) { 612 llvm::APSInt vecSize(32); 613 if (!Arg->isIntegerConstantExpr(vecSize, Context)) { 614 Diag(AttrLoc, diag::err_attribute_argument_not_int) 615 << "ext_vector_type" << Arg->getSourceRange(); 616 return QualType(); 617 } 618 619 // unlike gcc's vector_size attribute, the size is specified as the 620 // number of elements, not the number of bytes. 621 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 622 623 if (vectorSize == 0) { 624 Diag(AttrLoc, diag::err_attribute_zero_size) 625 << Arg->getSourceRange(); 626 return QualType(); 627 } 628 629 if (!T->isDependentType()) 630 return Context.getExtVectorType(T, vectorSize); 631 } 632 633 return Context.getDependentSizedExtVectorType(T, ArraySize.takeAs<Expr>(), 634 AttrLoc); 635} 636 637/// \brief Build a function type. 638/// 639/// This routine checks the function type according to C++ rules and 640/// under the assumption that the result type and parameter types have 641/// just been instantiated from a template. It therefore duplicates 642/// some of the behavior of GetTypeForDeclarator, but in a much 643/// simpler form that is only suitable for this narrow use case. 644/// 645/// \param T The return type of the function. 646/// 647/// \param ParamTypes The parameter types of the function. This array 648/// will be modified to account for adjustments to the types of the 649/// function parameters. 650/// 651/// \param NumParamTypes The number of parameter types in ParamTypes. 652/// 653/// \param Variadic Whether this is a variadic function type. 654/// 655/// \param Quals The cvr-qualifiers to be applied to the function type. 656/// 657/// \param Loc The location of the entity whose type involves this 658/// function type or, if there is no such entity, the location of the 659/// type that will have function type. 660/// 661/// \param Entity The name of the entity that involves the function 662/// type, if known. 663/// 664/// \returns A suitable function type, if there are no 665/// errors. Otherwise, returns a NULL type. 666QualType Sema::BuildFunctionType(QualType T, 667 QualType *ParamTypes, 668 unsigned NumParamTypes, 669 bool Variadic, unsigned Quals, 670 SourceLocation Loc, DeclarationName Entity) { 671 if (T->isArrayType() || T->isFunctionType()) { 672 Diag(Loc, diag::err_func_returning_array_function) << T; 673 return QualType(); 674 } 675 676 bool Invalid = false; 677 for (unsigned Idx = 0; Idx < NumParamTypes; ++Idx) { 678 QualType ParamType = adjustParameterType(ParamTypes[Idx]); 679 if (ParamType->isVoidType()) { 680 Diag(Loc, diag::err_param_with_void_type); 681 Invalid = true; 682 } 683 684 ParamTypes[Idx] = ParamType; 685 } 686 687 if (Invalid) 688 return QualType(); 689 690 return Context.getFunctionType(T, ParamTypes, NumParamTypes, Variadic, 691 Quals); 692} 693 694/// \brief Build a member pointer type \c T Class::*. 695/// 696/// \param T the type to which the member pointer refers. 697/// \param Class the class type into which the member pointer points. 698/// \param Quals Qualifiers applied to the member pointer type 699/// \param Loc the location where this type begins 700/// \param Entity the name of the entity that will have this member pointer type 701/// 702/// \returns a member pointer type, if successful, or a NULL type if there was 703/// an error. 704QualType Sema::BuildMemberPointerType(QualType T, QualType Class, 705 unsigned Quals, SourceLocation Loc, 706 DeclarationName Entity) { 707 // Verify that we're not building a pointer to pointer to function with 708 // exception specification. 709 if (CheckDistantExceptionSpec(T)) { 710 Diag(Loc, diag::err_distant_exception_spec); 711 712 // FIXME: If we're doing this as part of template instantiation, 713 // we should return immediately. 714 715 // Build the type anyway, but use the canonical type so that the 716 // exception specifiers are stripped off. 717 T = Context.getCanonicalType(T); 718 } 719 720 // C++ 8.3.3p3: A pointer to member shall not pointer to ... a member 721 // with reference type, or "cv void." 722 if (T->isReferenceType()) { 723 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference) 724 << (Entity? Entity.getAsString() : "type name"); 725 return QualType(); 726 } 727 728 if (T->isVoidType()) { 729 Diag(Loc, diag::err_illegal_decl_mempointer_to_void) 730 << (Entity? Entity.getAsString() : "type name"); 731 return QualType(); 732 } 733 734 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 735 // object or incomplete types shall not be restrict-qualified." 736 if ((Quals & QualType::Restrict) && !T->isIncompleteOrObjectType()) { 737 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 738 << T; 739 740 // FIXME: If we're doing this as part of template instantiation, 741 // we should return immediately. 742 Quals &= ~QualType::Restrict; 743 } 744 745 if (!Class->isDependentType() && !Class->isRecordType()) { 746 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class; 747 return QualType(); 748 } 749 750 return Context.getMemberPointerType(T, Class.getTypePtr()) 751 .getQualifiedType(Quals); 752} 753 754/// \brief Build a block pointer type. 755/// 756/// \param T The type to which we'll be building a block pointer. 757/// 758/// \param Quals The cvr-qualifiers to be applied to the block pointer type. 759/// 760/// \param Loc The location of the entity whose type involves this 761/// block pointer type or, if there is no such entity, the location of the 762/// type that will have block pointer type. 763/// 764/// \param Entity The name of the entity that involves the block pointer 765/// type, if known. 766/// 767/// \returns A suitable block pointer type, if there are no 768/// errors. Otherwise, returns a NULL type. 769QualType Sema::BuildBlockPointerType(QualType T, unsigned Quals, 770 SourceLocation Loc, 771 DeclarationName Entity) { 772 if (!T.getTypePtr()->isFunctionType()) { 773 Diag(Loc, diag::err_nonfunction_block_type); 774 return QualType(); 775 } 776 777 return Context.getBlockPointerType(T).getQualifiedType(Quals); 778} 779 780/// GetTypeForDeclarator - Convert the type for the specified 781/// declarator to Type instances. Skip the outermost Skip type 782/// objects. 783/// 784/// If OwnedDecl is non-NULL, and this declarator's decl-specifier-seq 785/// owns the declaration of a type (e.g., the definition of a struct 786/// type), then *OwnedDecl will receive the owned declaration. 787QualType Sema::GetTypeForDeclarator(Declarator &D, Scope *S, 788 DeclaratorInfo **DInfo, unsigned Skip, 789 TagDecl **OwnedDecl) { 790 bool OmittedReturnType = false; 791 792 if (D.getContext() == Declarator::BlockLiteralContext 793 && Skip == 0 794 && !D.getDeclSpec().hasTypeSpecifier() 795 && (D.getNumTypeObjects() == 0 796 || (D.getNumTypeObjects() == 1 797 && D.getTypeObject(0).Kind == DeclaratorChunk::Function))) 798 OmittedReturnType = true; 799 800 // long long is a C99 feature. 801 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 802 D.getDeclSpec().getTypeSpecWidth() == DeclSpec::TSW_longlong) 803 Diag(D.getDeclSpec().getTypeSpecWidthLoc(), diag::ext_longlong); 804 805 // Determine the type of the declarator. Not all forms of declarator 806 // have a type. 807 QualType T; 808 switch (D.getKind()) { 809 case Declarator::DK_Abstract: 810 case Declarator::DK_Normal: 811 case Declarator::DK_Operator: { 812 const DeclSpec &DS = D.getDeclSpec(); 813 if (OmittedReturnType) { 814 // We default to a dependent type initially. Can be modified by 815 // the first return statement. 816 T = Context.DependentTy; 817 } else { 818 bool isInvalid = false; 819 T = ConvertDeclSpecToType(DS, D.getIdentifierLoc(), isInvalid); 820 if (isInvalid) 821 D.setInvalidType(true); 822 else if (OwnedDecl && DS.isTypeSpecOwned()) 823 *OwnedDecl = cast<TagDecl>((Decl *)DS.getTypeRep()); 824 } 825 break; 826 } 827 828 case Declarator::DK_Constructor: 829 case Declarator::DK_Destructor: 830 case Declarator::DK_Conversion: 831 // Constructors and destructors don't have return types. Use 832 // "void" instead. Conversion operators will check their return 833 // types separately. 834 T = Context.VoidTy; 835 break; 836 } 837 838 if (T == Context.UndeducedAutoTy) { 839 int Error = -1; 840 841 switch (D.getContext()) { 842 case Declarator::KNRTypeListContext: 843 assert(0 && "K&R type lists aren't allowed in C++"); 844 break; 845 case Declarator::PrototypeContext: 846 Error = 0; // Function prototype 847 break; 848 case Declarator::MemberContext: 849 switch (cast<TagDecl>(CurContext)->getTagKind()) { 850 case TagDecl::TK_enum: assert(0 && "unhandled tag kind"); break; 851 case TagDecl::TK_struct: Error = 1; /* Struct member */ break; 852 case TagDecl::TK_union: Error = 2; /* Union member */ break; 853 case TagDecl::TK_class: Error = 3; /* Class member */ break; 854 } 855 break; 856 case Declarator::CXXCatchContext: 857 Error = 4; // Exception declaration 858 break; 859 case Declarator::TemplateParamContext: 860 Error = 5; // Template parameter 861 break; 862 case Declarator::BlockLiteralContext: 863 Error = 6; // Block literal 864 break; 865 case Declarator::FileContext: 866 case Declarator::BlockContext: 867 case Declarator::ForContext: 868 case Declarator::ConditionContext: 869 case Declarator::TypeNameContext: 870 break; 871 } 872 873 if (Error != -1) { 874 Diag(D.getDeclSpec().getTypeSpecTypeLoc(), diag::err_auto_not_allowed) 875 << Error; 876 T = Context.IntTy; 877 D.setInvalidType(true); 878 } 879 } 880 881 // The name we're declaring, if any. 882 DeclarationName Name; 883 if (D.getIdentifier()) 884 Name = D.getIdentifier(); 885 886 bool ShouldBuildInfo = DInfo != 0; 887 // The QualType referring to the type as written as source code. We can't use 888 // T because it can change due to semantic analysis. 889 QualType SourceTy = T; 890 891 // Walk the DeclTypeInfo, building the recursive type as we go. 892 // DeclTypeInfos are ordered from the identifier out, which is 893 // opposite of what we want :). 894 for (unsigned i = Skip, e = D.getNumTypeObjects(); i != e; ++i) { 895 DeclaratorChunk &DeclType = D.getTypeObject(e-i-1+Skip); 896 switch (DeclType.Kind) { 897 default: assert(0 && "Unknown decltype!"); 898 case DeclaratorChunk::BlockPointer: 899 if (ShouldBuildInfo) { 900 if (SourceTy->isFunctionType()) 901 SourceTy = Context.getBlockPointerType(SourceTy) 902 .getQualifiedType(DeclType.Cls.TypeQuals); 903 else 904 // If not function type Context::getBlockPointerType asserts, 905 // so just give up. 906 ShouldBuildInfo = false; 907 } 908 909 // If blocks are disabled, emit an error. 910 if (!LangOpts.Blocks) 911 Diag(DeclType.Loc, diag::err_blocks_disable); 912 913 T = BuildBlockPointerType(T, DeclType.Cls.TypeQuals, D.getIdentifierLoc(), 914 Name); 915 break; 916 case DeclaratorChunk::Pointer: 917 //FIXME: Use ObjCObjectPointer for info when appropriate. 918 if (ShouldBuildInfo) 919 SourceTy = Context.getPointerType(SourceTy) 920 .getQualifiedType(DeclType.Ptr.TypeQuals); 921 // Verify that we're not building a pointer to pointer to function with 922 // exception specification. 923 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 924 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 925 D.setInvalidType(true); 926 // Build the type anyway. 927 } 928 if (getLangOptions().ObjC1 && T->isObjCInterfaceType()) { 929 const ObjCInterfaceType *OIT = T->getAsObjCInterfaceType(); 930 T = Context.getObjCObjectPointerType(T, 931 (ObjCProtocolDecl **)OIT->qual_begin(), 932 OIT->getNumProtocols()); 933 break; 934 } 935 T = BuildPointerType(T, DeclType.Ptr.TypeQuals, DeclType.Loc, Name); 936 break; 937 case DeclaratorChunk::Reference: 938 if (ShouldBuildInfo) { 939 if (DeclType.Ref.LValueRef) 940 SourceTy = Context.getLValueReferenceType(SourceTy); 941 else 942 SourceTy = Context.getRValueReferenceType(SourceTy); 943 unsigned Quals = DeclType.Ref.HasRestrict ? QualType::Restrict : 0; 944 SourceTy = SourceTy.getQualifiedType(Quals); 945 } 946 947 // Verify that we're not building a reference to pointer to function with 948 // exception specification. 949 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 950 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 951 D.setInvalidType(true); 952 // Build the type anyway. 953 } 954 T = BuildReferenceType(T, DeclType.Ref.LValueRef, 955 DeclType.Ref.HasRestrict ? QualType::Restrict : 0, 956 DeclType.Loc, Name); 957 break; 958 case DeclaratorChunk::Array: { 959 if (ShouldBuildInfo) 960 // We just need to get an array type, the exact type doesn't matter. 961 SourceTy = Context.getIncompleteArrayType(SourceTy, ArrayType::Normal, 962 DeclType.Arr.TypeQuals); 963 964 // Verify that we're not building an array of pointers to function with 965 // exception specification. 966 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 967 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 968 D.setInvalidType(true); 969 // Build the type anyway. 970 } 971 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 972 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 973 ArrayType::ArraySizeModifier ASM; 974 if (ATI.isStar) 975 ASM = ArrayType::Star; 976 else if (ATI.hasStatic) 977 ASM = ArrayType::Static; 978 else 979 ASM = ArrayType::Normal; 980 if (ASM == ArrayType::Star && 981 D.getContext() != Declarator::PrototypeContext) { 982 // FIXME: This check isn't quite right: it allows star in prototypes 983 // for function definitions, and disallows some edge cases detailed 984 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html 985 Diag(DeclType.Loc, diag::err_array_star_outside_prototype); 986 ASM = ArrayType::Normal; 987 D.setInvalidType(true); 988 } 989 T = BuildArrayType(T, ASM, ArraySize, ATI.TypeQuals, 990 SourceRange(DeclType.Loc, DeclType.EndLoc), Name); 991 break; 992 } 993 case DeclaratorChunk::Function: { 994 if (ShouldBuildInfo) { 995 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 996 llvm::SmallVector<QualType, 16> ArgTys; 997 998 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 999 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 1000 if (Param) 1001 ArgTys.push_back(Param->getType()); 1002 } 1003 SourceTy = Context.getFunctionType(SourceTy, ArgTys.data(), 1004 ArgTys.size(), 1005 FTI.isVariadic, FTI.TypeQuals); 1006 } 1007 1008 // If the function declarator has a prototype (i.e. it is not () and 1009 // does not have a K&R-style identifier list), then the arguments are part 1010 // of the type, otherwise the argument list is (). 1011 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 1012 1013 // C99 6.7.5.3p1: The return type may not be a function or array type. 1014 if (T->isArrayType() || T->isFunctionType()) { 1015 Diag(DeclType.Loc, diag::err_func_returning_array_function) << T; 1016 T = Context.IntTy; 1017 D.setInvalidType(true); 1018 } 1019 1020 if (getLangOptions().CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) { 1021 // C++ [dcl.fct]p6: 1022 // Types shall not be defined in return or parameter types. 1023 TagDecl *Tag = cast<TagDecl>((Decl *)D.getDeclSpec().getTypeRep()); 1024 if (Tag->isDefinition()) 1025 Diag(Tag->getLocation(), diag::err_type_defined_in_result_type) 1026 << Context.getTypeDeclType(Tag); 1027 } 1028 1029 // Exception specs are not allowed in typedefs. Complain, but add it 1030 // anyway. 1031 if (FTI.hasExceptionSpec && 1032 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1033 Diag(FTI.getThrowLoc(), diag::err_exception_spec_in_typedef); 1034 1035 if (FTI.NumArgs == 0) { 1036 if (getLangOptions().CPlusPlus) { 1037 // C++ 8.3.5p2: If the parameter-declaration-clause is empty, the 1038 // function takes no arguments. 1039 llvm::SmallVector<QualType, 4> Exceptions; 1040 Exceptions.reserve(FTI.NumExceptions); 1041 for(unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) { 1042 QualType ET = QualType::getFromOpaquePtr(FTI.Exceptions[ei].Ty); 1043 // Check that the type is valid for an exception spec, and drop it 1044 // if not. 1045 if (!CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range)) 1046 Exceptions.push_back(ET); 1047 } 1048 T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic, FTI.TypeQuals, 1049 FTI.hasExceptionSpec, 1050 FTI.hasAnyExceptionSpec, 1051 Exceptions.size(), Exceptions.data()); 1052 } else if (FTI.isVariadic) { 1053 // We allow a zero-parameter variadic function in C if the 1054 // function is marked with the "overloadable" 1055 // attribute. Scan for this attribute now. 1056 bool Overloadable = false; 1057 for (const AttributeList *Attrs = D.getAttributes(); 1058 Attrs; Attrs = Attrs->getNext()) { 1059 if (Attrs->getKind() == AttributeList::AT_overloadable) { 1060 Overloadable = true; 1061 break; 1062 } 1063 } 1064 1065 if (!Overloadable) 1066 Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); 1067 T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic, 0); 1068 } else { 1069 // Simple void foo(), where the incoming T is the result type. 1070 T = Context.getFunctionNoProtoType(T); 1071 } 1072 } else if (FTI.ArgInfo[0].Param == 0) { 1073 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function definition. 1074 Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 1075 } else { 1076 // Otherwise, we have a function with an argument list that is 1077 // potentially variadic. 1078 llvm::SmallVector<QualType, 16> ArgTys; 1079 1080 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 1081 ParmVarDecl *Param = 1082 cast<ParmVarDecl>(FTI.ArgInfo[i].Param.getAs<Decl>()); 1083 QualType ArgTy = Param->getType(); 1084 assert(!ArgTy.isNull() && "Couldn't parse type?"); 1085 1086 // Adjust the parameter type. 1087 assert((ArgTy == adjustParameterType(ArgTy)) && "Unadjusted type?"); 1088 1089 // Look for 'void'. void is allowed only as a single argument to a 1090 // function with no other parameters (C99 6.7.5.3p10). We record 1091 // int(void) as a FunctionProtoType with an empty argument list. 1092 if (ArgTy->isVoidType()) { 1093 // If this is something like 'float(int, void)', reject it. 'void' 1094 // is an incomplete type (C99 6.2.5p19) and function decls cannot 1095 // have arguments of incomplete type. 1096 if (FTI.NumArgs != 1 || FTI.isVariadic) { 1097 Diag(DeclType.Loc, diag::err_void_only_param); 1098 ArgTy = Context.IntTy; 1099 Param->setType(ArgTy); 1100 } else if (FTI.ArgInfo[i].Ident) { 1101 // Reject, but continue to parse 'int(void abc)'. 1102 Diag(FTI.ArgInfo[i].IdentLoc, 1103 diag::err_param_with_void_type); 1104 ArgTy = Context.IntTy; 1105 Param->setType(ArgTy); 1106 } else { 1107 // Reject, but continue to parse 'float(const void)'. 1108 if (ArgTy.getCVRQualifiers()) 1109 Diag(DeclType.Loc, diag::err_void_param_qualified); 1110 1111 // Do not add 'void' to the ArgTys list. 1112 break; 1113 } 1114 } else if (!FTI.hasPrototype) { 1115 if (ArgTy->isPromotableIntegerType()) { 1116 ArgTy = Context.IntTy; 1117 } else if (const BuiltinType* BTy = ArgTy->getAsBuiltinType()) { 1118 if (BTy->getKind() == BuiltinType::Float) 1119 ArgTy = Context.DoubleTy; 1120 } 1121 } 1122 1123 ArgTys.push_back(ArgTy); 1124 } 1125 1126 llvm::SmallVector<QualType, 4> Exceptions; 1127 Exceptions.reserve(FTI.NumExceptions); 1128 for(unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) { 1129 QualType ET = QualType::getFromOpaquePtr(FTI.Exceptions[ei].Ty); 1130 // Check that the type is valid for an exception spec, and drop it if 1131 // not. 1132 if (!CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range)) 1133 Exceptions.push_back(ET); 1134 } 1135 1136 T = Context.getFunctionType(T, ArgTys.data(), ArgTys.size(), 1137 FTI.isVariadic, FTI.TypeQuals, 1138 FTI.hasExceptionSpec, 1139 FTI.hasAnyExceptionSpec, 1140 Exceptions.size(), Exceptions.data()); 1141 } 1142 break; 1143 } 1144 case DeclaratorChunk::MemberPointer: 1145 // Verify that we're not building a pointer to pointer to function with 1146 // exception specification. 1147 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 1148 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 1149 D.setInvalidType(true); 1150 // Build the type anyway. 1151 } 1152 // The scope spec must refer to a class, or be dependent. 1153 QualType ClsType; 1154 if (isDependentScopeSpecifier(DeclType.Mem.Scope())) { 1155 NestedNameSpecifier *NNS 1156 = (NestedNameSpecifier *)DeclType.Mem.Scope().getScopeRep(); 1157 assert(NNS->getAsType() && "Nested-name-specifier must name a type"); 1158 ClsType = QualType(NNS->getAsType(), 0); 1159 } else if (CXXRecordDecl *RD 1160 = dyn_cast_or_null<CXXRecordDecl>( 1161 computeDeclContext(DeclType.Mem.Scope()))) { 1162 ClsType = Context.getTagDeclType(RD); 1163 } else { 1164 Diag(DeclType.Mem.Scope().getBeginLoc(), 1165 diag::err_illegal_decl_mempointer_in_nonclass) 1166 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 1167 << DeclType.Mem.Scope().getRange(); 1168 D.setInvalidType(true); 1169 } 1170 1171 if (ShouldBuildInfo) { 1172 QualType cls = !ClsType.isNull() ? ClsType : Context.IntTy; 1173 SourceTy = Context.getMemberPointerType(SourceTy, cls.getTypePtr()) 1174 .getQualifiedType(DeclType.Mem.TypeQuals); 1175 } 1176 1177 if (!ClsType.isNull()) 1178 T = BuildMemberPointerType(T, ClsType, DeclType.Mem.TypeQuals, 1179 DeclType.Loc, D.getIdentifier()); 1180 if (T.isNull()) { 1181 T = Context.IntTy; 1182 D.setInvalidType(true); 1183 } 1184 break; 1185 } 1186 1187 if (T.isNull()) { 1188 D.setInvalidType(true); 1189 T = Context.IntTy; 1190 } 1191 1192 // See if there are any attributes on this declarator chunk. 1193 if (const AttributeList *AL = DeclType.getAttrs()) 1194 ProcessTypeAttributeList(T, AL); 1195 } 1196 1197 if (getLangOptions().CPlusPlus && T->isFunctionType()) { 1198 const FunctionProtoType *FnTy = T->getAsFunctionProtoType(); 1199 assert(FnTy && "Why oh why is there not a FunctionProtoType here ?"); 1200 1201 // C++ 8.3.5p4: A cv-qualifier-seq shall only be part of the function type 1202 // for a nonstatic member function, the function type to which a pointer 1203 // to member refers, or the top-level function type of a function typedef 1204 // declaration. 1205 if (FnTy->getTypeQuals() != 0 && 1206 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 1207 ((D.getContext() != Declarator::MemberContext && 1208 (!D.getCXXScopeSpec().isSet() || 1209 !computeDeclContext(D.getCXXScopeSpec(), /*FIXME:*/true) 1210 ->isRecord())) || 1211 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static)) { 1212 if (D.isFunctionDeclarator()) 1213 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_function_type); 1214 else 1215 Diag(D.getIdentifierLoc(), 1216 diag::err_invalid_qualified_typedef_function_type_use); 1217 1218 // Strip the cv-quals from the type. 1219 T = Context.getFunctionType(FnTy->getResultType(), FnTy->arg_type_begin(), 1220 FnTy->getNumArgs(), FnTy->isVariadic(), 0); 1221 } 1222 } 1223 1224 // If there were any type attributes applied to the decl itself (not the 1225 // type, apply the type attribute to the type!) 1226 if (const AttributeList *Attrs = D.getAttributes()) 1227 ProcessTypeAttributeList(T, Attrs); 1228 1229 if (ShouldBuildInfo) 1230 *DInfo = GetDeclaratorInfoForDeclarator(D, SourceTy, Skip); 1231 1232 return T; 1233} 1234 1235/// \brief Create and instantiate a DeclaratorInfo with type source information. 1236/// 1237/// \param T QualType referring to the type as written in source code. 1238DeclaratorInfo * 1239Sema::GetDeclaratorInfoForDeclarator(Declarator &D, QualType T, unsigned Skip) { 1240 DeclaratorInfo *DInfo = Context.CreateDeclaratorInfo(T); 1241 TypeLoc CurrTL = DInfo->getTypeLoc(); 1242 1243 for (unsigned i = Skip, e = D.getNumTypeObjects(); i != e; ++i) { 1244 assert(!CurrTL.isNull()); 1245 1246 DeclaratorChunk &DeclType = D.getTypeObject(i); 1247 switch (DeclType.Kind) { 1248 default: assert(0 && "Unknown decltype!"); 1249 case DeclaratorChunk::BlockPointer: { 1250 BlockPointerLoc &BPL = cast<BlockPointerLoc>(CurrTL); 1251 BPL.setCaretLoc(DeclType.Loc); 1252 break; 1253 } 1254 case DeclaratorChunk::Pointer: { 1255 //FIXME: ObjCObject pointers. 1256 PointerLoc &PL = cast<PointerLoc>(CurrTL); 1257 PL.setStarLoc(DeclType.Loc); 1258 break; 1259 } 1260 case DeclaratorChunk::Reference: { 1261 ReferenceLoc &RL = cast<ReferenceLoc>(CurrTL); 1262 RL.setAmpLoc(DeclType.Loc); 1263 break; 1264 } 1265 case DeclaratorChunk::Array: { 1266 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 1267 ArrayLoc &AL = cast<ArrayLoc>(CurrTL); 1268 AL.setLBracketLoc(DeclType.Loc); 1269 AL.setRBracketLoc(DeclType.EndLoc); 1270 AL.setSizeExpr(static_cast<Expr*>(ATI.NumElts)); 1271 //FIXME: Star location for [*]. 1272 break; 1273 } 1274 case DeclaratorChunk::Function: { 1275 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 1276 FunctionLoc &FL = cast<FunctionLoc>(CurrTL); 1277 FL.setLParenLoc(DeclType.Loc); 1278 FL.setRParenLoc(DeclType.EndLoc); 1279 for (unsigned i = 0, e = FTI.NumArgs, tpi = 0; i != e; ++i) { 1280 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 1281 if (Param) { 1282 assert(tpi < FL.getNumArgs()); 1283 FL.setArg(tpi++, Param); 1284 } 1285 } 1286 break; 1287 //FIXME: Exception specs. 1288 } 1289 case DeclaratorChunk::MemberPointer: { 1290 MemberPointerLoc &MPL = cast<MemberPointerLoc>(CurrTL); 1291 MPL.setStarLoc(DeclType.Loc); 1292 //FIXME: Class location. 1293 break; 1294 } 1295 1296 } 1297 1298 CurrTL = CurrTL.getNextTypeLoc(); 1299 } 1300 1301 if (TypedefLoc *TL = dyn_cast<TypedefLoc>(&CurrTL)) { 1302 TL->setNameLoc(D.getDeclSpec().getTypeSpecTypeLoc()); 1303 } else { 1304 //FIXME: Other typespecs. 1305 DefaultTypeSpecLoc &DTL = cast<DefaultTypeSpecLoc>(CurrTL); 1306 DTL.setStartLoc(D.getDeclSpec().getTypeSpecTypeLoc()); 1307 } 1308 1309 return DInfo; 1310} 1311 1312/// CheckSpecifiedExceptionType - Check if the given type is valid in an 1313/// exception specification. Incomplete types, or pointers to incomplete types 1314/// other than void are not allowed. 1315bool Sema::CheckSpecifiedExceptionType(QualType T, const SourceRange &Range) { 1316 // FIXME: This may not correctly work with the fix for core issue 437, 1317 // where a class's own type is considered complete within its body. 1318 1319 // C++ 15.4p2: A type denoted in an exception-specification shall not denote 1320 // an incomplete type. 1321 if (T->isIncompleteType()) 1322 return Diag(Range.getBegin(), diag::err_incomplete_in_exception_spec) 1323 << Range << T << /*direct*/0; 1324 1325 // C++ 15.4p2: A type denoted in an exception-specification shall not denote 1326 // an incomplete type a pointer or reference to an incomplete type, other 1327 // than (cv) void*. 1328 int kind; 1329 if (const PointerType* IT = T->getAs<PointerType>()) { 1330 T = IT->getPointeeType(); 1331 kind = 1; 1332 } else if (const ReferenceType* IT = T->getAs<ReferenceType>()) { 1333 T = IT->getPointeeType(); 1334 kind = 2; 1335 } else 1336 return false; 1337 1338 if (T->isIncompleteType() && !T->isVoidType()) 1339 return Diag(Range.getBegin(), diag::err_incomplete_in_exception_spec) 1340 << Range << T << /*indirect*/kind; 1341 1342 return false; 1343} 1344 1345/// CheckDistantExceptionSpec - Check if the given type is a pointer or pointer 1346/// to member to a function with an exception specification. This means that 1347/// it is invalid to add another level of indirection. 1348bool Sema::CheckDistantExceptionSpec(QualType T) { 1349 if (const PointerType *PT = T->getAs<PointerType>()) 1350 T = PT->getPointeeType(); 1351 else if (const MemberPointerType *PT = T->getAs<MemberPointerType>()) 1352 T = PT->getPointeeType(); 1353 else 1354 return false; 1355 1356 const FunctionProtoType *FnT = T->getAsFunctionProtoType(); 1357 if (!FnT) 1358 return false; 1359 1360 return FnT->hasExceptionSpec(); 1361} 1362 1363/// CheckEquivalentExceptionSpec - Check if the two types have equivalent 1364/// exception specifications. Exception specifications are equivalent if 1365/// they allow exactly the same set of exception types. It does not matter how 1366/// that is achieved. See C++ [except.spec]p2. 1367bool Sema::CheckEquivalentExceptionSpec( 1368 const FunctionProtoType *Old, SourceLocation OldLoc, 1369 const FunctionProtoType *New, SourceLocation NewLoc) { 1370 bool OldAny = !Old->hasExceptionSpec() || Old->hasAnyExceptionSpec(); 1371 bool NewAny = !New->hasExceptionSpec() || New->hasAnyExceptionSpec(); 1372 if (OldAny && NewAny) 1373 return false; 1374 if (OldAny || NewAny) { 1375 Diag(NewLoc, diag::err_mismatched_exception_spec); 1376 Diag(OldLoc, diag::note_previous_declaration); 1377 return true; 1378 } 1379 1380 bool Success = true; 1381 // Both have a definite exception spec. Collect the first set, then compare 1382 // to the second. 1383 llvm::SmallPtrSet<const Type*, 8> Types; 1384 for (FunctionProtoType::exception_iterator I = Old->exception_begin(), 1385 E = Old->exception_end(); I != E; ++I) 1386 Types.insert(Context.getCanonicalType(*I).getTypePtr()); 1387 1388 for (FunctionProtoType::exception_iterator I = New->exception_begin(), 1389 E = New->exception_end(); I != E && Success; ++I) 1390 Success = Types.erase(Context.getCanonicalType(*I).getTypePtr()); 1391 1392 Success = Success && Types.empty(); 1393 1394 if (Success) { 1395 return false; 1396 } 1397 Diag(NewLoc, diag::err_mismatched_exception_spec); 1398 Diag(OldLoc, diag::note_previous_declaration); 1399 return true; 1400} 1401 1402/// CheckExceptionSpecSubset - Check whether the second function type's 1403/// exception specification is a subset (or equivalent) of the first function 1404/// type. This is used by override and pointer assignment checks. 1405bool Sema::CheckExceptionSpecSubset(unsigned DiagID, unsigned NoteID, 1406 const FunctionProtoType *Superset, SourceLocation SuperLoc, 1407 const FunctionProtoType *Subset, SourceLocation SubLoc) 1408{ 1409 // FIXME: As usual, we could be more specific in our error messages, but 1410 // that better waits until we've got types with source locations. 1411 1412 // If superset contains everything, we're done. 1413 if (!Superset->hasExceptionSpec() || Superset->hasAnyExceptionSpec()) 1414 return false; 1415 1416 // It does not. If the subset contains everything, we've failed. 1417 if (!Subset->hasExceptionSpec() || Subset->hasAnyExceptionSpec()) { 1418 Diag(SubLoc, DiagID); 1419 Diag(SuperLoc, NoteID); 1420 return true; 1421 } 1422 1423 // Neither contains everything. Do a proper comparison. 1424 for (FunctionProtoType::exception_iterator SubI = Subset->exception_begin(), 1425 SubE = Subset->exception_end(); SubI != SubE; ++SubI) { 1426 // Take one type from the subset. 1427 QualType CanonicalSubT = Context.getCanonicalType(*SubI); 1428 bool SubIsPointer = false; 1429 if (const ReferenceType *RefTy = CanonicalSubT->getAs<ReferenceType>()) 1430 CanonicalSubT = RefTy->getPointeeType(); 1431 if (const PointerType *PtrTy = CanonicalSubT->getAs<PointerType>()) { 1432 CanonicalSubT = PtrTy->getPointeeType(); 1433 SubIsPointer = true; 1434 } 1435 bool SubIsClass = CanonicalSubT->isRecordType(); 1436 CanonicalSubT.setCVRQualifiers(0); 1437 1438 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1439 /*DetectVirtual=*/false); 1440 1441 bool Contained = false; 1442 // Make sure it's in the superset. 1443 for (FunctionProtoType::exception_iterator SuperI = 1444 Superset->exception_begin(), SuperE = Superset->exception_end(); 1445 SuperI != SuperE; ++SuperI) { 1446 QualType CanonicalSuperT = Context.getCanonicalType(*SuperI); 1447 // SubT must be SuperT or derived from it, or pointer or reference to 1448 // such types. 1449 if (const ReferenceType *RefTy = CanonicalSuperT->getAs<ReferenceType>()) 1450 CanonicalSuperT = RefTy->getPointeeType(); 1451 if (SubIsPointer) { 1452 if (const PointerType *PtrTy = CanonicalSuperT->getAs<PointerType>()) 1453 CanonicalSuperT = PtrTy->getPointeeType(); 1454 else { 1455 continue; 1456 } 1457 } 1458 CanonicalSuperT.setCVRQualifiers(0); 1459 // If the types are the same, move on to the next type in the subset. 1460 if (CanonicalSubT == CanonicalSuperT) { 1461 Contained = true; 1462 break; 1463 } 1464 1465 // Otherwise we need to check the inheritance. 1466 if (!SubIsClass || !CanonicalSuperT->isRecordType()) 1467 continue; 1468 1469 Paths.clear(); 1470 if (!IsDerivedFrom(CanonicalSubT, CanonicalSuperT, Paths)) 1471 continue; 1472 1473 if (Paths.isAmbiguous(CanonicalSuperT)) 1474 continue; 1475 1476 if (FindInaccessibleBase(CanonicalSubT, CanonicalSuperT, Paths, true)) 1477 continue; 1478 1479 Contained = true; 1480 break; 1481 } 1482 if (!Contained) { 1483 Diag(SubLoc, DiagID); 1484 Diag(SuperLoc, NoteID); 1485 return true; 1486 } 1487 } 1488 // We've run the gauntlet. 1489 return false; 1490} 1491 1492/// ObjCGetTypeForMethodDefinition - Builds the type for a method definition 1493/// declarator 1494QualType Sema::ObjCGetTypeForMethodDefinition(DeclPtrTy D) { 1495 ObjCMethodDecl *MDecl = cast<ObjCMethodDecl>(D.getAs<Decl>()); 1496 QualType T = MDecl->getResultType(); 1497 llvm::SmallVector<QualType, 16> ArgTys; 1498 1499 // Add the first two invisible argument types for self and _cmd. 1500 if (MDecl->isInstanceMethod()) { 1501 QualType selfTy = Context.getObjCInterfaceType(MDecl->getClassInterface()); 1502 selfTy = Context.getPointerType(selfTy); 1503 ArgTys.push_back(selfTy); 1504 } else 1505 ArgTys.push_back(Context.getObjCIdType()); 1506 ArgTys.push_back(Context.getObjCSelType()); 1507 1508 for (ObjCMethodDecl::param_iterator PI = MDecl->param_begin(), 1509 E = MDecl->param_end(); PI != E; ++PI) { 1510 QualType ArgTy = (*PI)->getType(); 1511 assert(!ArgTy.isNull() && "Couldn't parse type?"); 1512 ArgTy = adjustParameterType(ArgTy); 1513 ArgTys.push_back(ArgTy); 1514 } 1515 T = Context.getFunctionType(T, &ArgTys[0], ArgTys.size(), 1516 MDecl->isVariadic(), 0); 1517 return T; 1518} 1519 1520/// UnwrapSimilarPointerTypes - If T1 and T2 are pointer types that 1521/// may be similar (C++ 4.4), replaces T1 and T2 with the type that 1522/// they point to and return true. If T1 and T2 aren't pointer types 1523/// or pointer-to-member types, or if they are not similar at this 1524/// level, returns false and leaves T1 and T2 unchanged. Top-level 1525/// qualifiers on T1 and T2 are ignored. This function will typically 1526/// be called in a loop that successively "unwraps" pointer and 1527/// pointer-to-member types to compare them at each level. 1528bool Sema::UnwrapSimilarPointerTypes(QualType& T1, QualType& T2) { 1529 const PointerType *T1PtrType = T1->getAs<PointerType>(), 1530 *T2PtrType = T2->getAs<PointerType>(); 1531 if (T1PtrType && T2PtrType) { 1532 T1 = T1PtrType->getPointeeType(); 1533 T2 = T2PtrType->getPointeeType(); 1534 return true; 1535 } 1536 1537 const MemberPointerType *T1MPType = T1->getAs<MemberPointerType>(), 1538 *T2MPType = T2->getAs<MemberPointerType>(); 1539 if (T1MPType && T2MPType && 1540 Context.getCanonicalType(T1MPType->getClass()) == 1541 Context.getCanonicalType(T2MPType->getClass())) { 1542 T1 = T1MPType->getPointeeType(); 1543 T2 = T2MPType->getPointeeType(); 1544 return true; 1545 } 1546 return false; 1547} 1548 1549Sema::TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 1550 // C99 6.7.6: Type names have no identifier. This is already validated by 1551 // the parser. 1552 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 1553 1554 DeclaratorInfo *DInfo = 0; 1555 TagDecl *OwnedTag = 0; 1556 QualType T = GetTypeForDeclarator(D, S, &DInfo, /*Skip=*/0, &OwnedTag); 1557 if (D.isInvalidType()) 1558 return true; 1559 1560 if (getLangOptions().CPlusPlus) { 1561 // Check that there are no default arguments (C++ only). 1562 CheckExtraCXXDefaultArguments(D); 1563 1564 // C++0x [dcl.type]p3: 1565 // A type-specifier-seq shall not define a class or enumeration 1566 // unless it appears in the type-id of an alias-declaration 1567 // (7.1.3). 1568 if (OwnedTag && OwnedTag->isDefinition()) 1569 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_type_specifier) 1570 << Context.getTypeDeclType(OwnedTag); 1571 } 1572 1573 //FIXME: Also pass DeclaratorInfo. 1574 return T.getAsOpaquePtr(); 1575} 1576 1577 1578 1579//===----------------------------------------------------------------------===// 1580// Type Attribute Processing 1581//===----------------------------------------------------------------------===// 1582 1583/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 1584/// specified type. The attribute contains 1 argument, the id of the address 1585/// space for the type. 1586static void HandleAddressSpaceTypeAttribute(QualType &Type, 1587 const AttributeList &Attr, Sema &S){ 1588 // If this type is already address space qualified, reject it. 1589 // Clause 6.7.3 - Type qualifiers: "No type shall be qualified by qualifiers 1590 // for two or more different address spaces." 1591 if (Type.getAddressSpace()) { 1592 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 1593 return; 1594 } 1595 1596 // Check the attribute arguments. 1597 if (Attr.getNumArgs() != 1) { 1598 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1599 return; 1600 } 1601 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 1602 llvm::APSInt addrSpace(32); 1603 if (!ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 1604 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 1605 << ASArgExpr->getSourceRange(); 1606 return; 1607 } 1608 1609 // Bounds checking. 1610 if (addrSpace.isSigned()) { 1611 if (addrSpace.isNegative()) { 1612 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative) 1613 << ASArgExpr->getSourceRange(); 1614 return; 1615 } 1616 addrSpace.setIsSigned(false); 1617 } 1618 llvm::APSInt max(addrSpace.getBitWidth()); 1619 max = QualType::MaxAddressSpace; 1620 if (addrSpace > max) { 1621 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high) 1622 << QualType::MaxAddressSpace << ASArgExpr->getSourceRange(); 1623 return; 1624 } 1625 1626 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 1627 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 1628} 1629 1630/// HandleObjCGCTypeAttribute - Process an objc's gc attribute on the 1631/// specified type. The attribute contains 1 argument, weak or strong. 1632static void HandleObjCGCTypeAttribute(QualType &Type, 1633 const AttributeList &Attr, Sema &S) { 1634 if (Type.getObjCGCAttr() != QualType::GCNone) { 1635 S.Diag(Attr.getLoc(), diag::err_attribute_multiple_objc_gc); 1636 return; 1637 } 1638 1639 // Check the attribute arguments. 1640 if (!Attr.getParameterName()) { 1641 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) 1642 << "objc_gc" << 1; 1643 return; 1644 } 1645 QualType::GCAttrTypes GCAttr; 1646 if (Attr.getNumArgs() != 0) { 1647 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1648 return; 1649 } 1650 if (Attr.getParameterName()->isStr("weak")) 1651 GCAttr = QualType::Weak; 1652 else if (Attr.getParameterName()->isStr("strong")) 1653 GCAttr = QualType::Strong; 1654 else { 1655 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported) 1656 << "objc_gc" << Attr.getParameterName(); 1657 return; 1658 } 1659 1660 Type = S.Context.getObjCGCQualType(Type, GCAttr); 1661} 1662 1663/// HandleNoReturnTypeAttribute - Process the noreturn attribute on the 1664/// specified type. The attribute contains 0 arguments. 1665static void HandleNoReturnTypeAttribute(QualType &Type, 1666 const AttributeList &Attr, Sema &S) { 1667 if (Attr.getNumArgs() != 0) 1668 return; 1669 1670 // We only apply this to a pointer to function or a pointer to block. 1671 if (!Type->isFunctionPointerType() 1672 && !Type->isBlockPointerType() 1673 && !Type->isFunctionType()) 1674 return; 1675 1676 Type = S.Context.getNoReturnType(Type); 1677} 1678 1679void Sema::ProcessTypeAttributeList(QualType &Result, const AttributeList *AL) { 1680 // Scan through and apply attributes to this type where it makes sense. Some 1681 // attributes (such as __address_space__, __vector_size__, etc) apply to the 1682 // type, but others can be present in the type specifiers even though they 1683 // apply to the decl. Here we apply type attributes and ignore the rest. 1684 for (; AL; AL = AL->getNext()) { 1685 // If this is an attribute we can handle, do so now, otherwise, add it to 1686 // the LeftOverAttrs list for rechaining. 1687 switch (AL->getKind()) { 1688 default: break; 1689 case AttributeList::AT_address_space: 1690 HandleAddressSpaceTypeAttribute(Result, *AL, *this); 1691 break; 1692 case AttributeList::AT_objc_gc: 1693 HandleObjCGCTypeAttribute(Result, *AL, *this); 1694 break; 1695 case AttributeList::AT_noreturn: 1696 HandleNoReturnTypeAttribute(Result, *AL, *this); 1697 break; 1698 } 1699 } 1700} 1701 1702/// @brief Ensure that the type T is a complete type. 1703/// 1704/// This routine checks whether the type @p T is complete in any 1705/// context where a complete type is required. If @p T is a complete 1706/// type, returns false. If @p T is a class template specialization, 1707/// this routine then attempts to perform class template 1708/// instantiation. If instantiation fails, or if @p T is incomplete 1709/// and cannot be completed, issues the diagnostic @p diag (giving it 1710/// the type @p T) and returns true. 1711/// 1712/// @param Loc The location in the source that the incomplete type 1713/// diagnostic should refer to. 1714/// 1715/// @param T The type that this routine is examining for completeness. 1716/// 1717/// @param diag The diagnostic value (e.g., 1718/// @c diag::err_typecheck_decl_incomplete_type) that will be used 1719/// for the error message if @p T is incomplete. 1720/// 1721/// @param Range1 An optional range in the source code that will be a 1722/// part of the "incomplete type" error message. 1723/// 1724/// @param Range2 An optional range in the source code that will be a 1725/// part of the "incomplete type" error message. 1726/// 1727/// @param PrintType If non-NULL, the type that should be printed 1728/// instead of @p T. This parameter should be used when the type that 1729/// we're checking for incompleteness isn't the type that should be 1730/// displayed to the user, e.g., when T is a type and PrintType is a 1731/// pointer to T. 1732/// 1733/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 1734/// @c false otherwise. 1735bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, unsigned diag, 1736 SourceRange Range1, SourceRange Range2, 1737 QualType PrintType) { 1738 // FIXME: Add this assertion to help us flush out problems with 1739 // checking for dependent types and type-dependent expressions. 1740 // 1741 // assert(!T->isDependentType() && 1742 // "Can't ask whether a dependent type is complete"); 1743 1744 // If we have a complete type, we're done. 1745 if (!T->isIncompleteType()) 1746 return false; 1747 1748 // If we have a class template specialization or a class member of a 1749 // class template specialization, try to instantiate it. 1750 if (const RecordType *Record = T->getAs<RecordType>()) { 1751 if (ClassTemplateSpecializationDecl *ClassTemplateSpec 1752 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { 1753 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) { 1754 // Update the class template specialization's location to 1755 // refer to the point of instantiation. 1756 if (Loc.isValid()) 1757 ClassTemplateSpec->setLocation(Loc); 1758 return InstantiateClassTemplateSpecialization(ClassTemplateSpec, 1759 /*ExplicitInstantiation=*/false); 1760 } 1761 } else if (CXXRecordDecl *Rec 1762 = dyn_cast<CXXRecordDecl>(Record->getDecl())) { 1763 if (CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass()) { 1764 // Find the class template specialization that surrounds this 1765 // member class. 1766 ClassTemplateSpecializationDecl *Spec = 0; 1767 for (DeclContext *Parent = Rec->getDeclContext(); 1768 Parent && !Spec; Parent = Parent->getParent()) 1769 Spec = dyn_cast<ClassTemplateSpecializationDecl>(Parent); 1770 assert(Spec && "Not a member of a class template specialization?"); 1771 return InstantiateClass(Loc, Rec, Pattern, Spec->getTemplateArgs(), 1772 /*ExplicitInstantiation=*/false); 1773 } 1774 } 1775 } 1776 1777 if (PrintType.isNull()) 1778 PrintType = T; 1779 1780 // We have an incomplete type. Produce a diagnostic. 1781 Diag(Loc, diag) << PrintType << Range1 << Range2; 1782 1783 // If the type was a forward declaration of a class/struct/union 1784 // type, produce 1785 const TagType *Tag = 0; 1786 if (const RecordType *Record = T->getAs<RecordType>()) 1787 Tag = Record; 1788 else if (const EnumType *Enum = T->getAsEnumType()) 1789 Tag = Enum; 1790 1791 if (Tag && !Tag->getDecl()->isInvalidDecl()) 1792 Diag(Tag->getDecl()->getLocation(), 1793 Tag->isBeingDefined() ? diag::note_type_being_defined 1794 : diag::note_forward_declaration) 1795 << QualType(Tag, 0); 1796 1797 return true; 1798} 1799 1800/// \brief Retrieve a version of the type 'T' that is qualified by the 1801/// nested-name-specifier contained in SS. 1802QualType Sema::getQualifiedNameType(const CXXScopeSpec &SS, QualType T) { 1803 if (!SS.isSet() || SS.isInvalid() || T.isNull()) 1804 return T; 1805 1806 NestedNameSpecifier *NNS 1807 = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 1808 return Context.getQualifiedNameType(NNS, T); 1809} 1810 1811QualType Sema::BuildTypeofExprType(Expr *E) { 1812 return Context.getTypeOfExprType(E); 1813} 1814 1815QualType Sema::BuildDecltypeType(Expr *E) { 1816 if (E->getType() == Context.OverloadTy) { 1817 Diag(E->getLocStart(), 1818 diag::err_cannot_determine_declared_type_of_overloaded_function); 1819 return QualType(); 1820 } 1821 return Context.getDecltypeType(E); 1822} 1823