SemaType.cpp revision d6802baf62618c4fd22b02c94e4cd206de08b40e
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 = GetTypeFromParser(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 // FIXME: Preserve type source info. 251 Result = GetTypeFromParser(DS.getTypeRep()); 252 assert(!Result.isNull() && "Didn't get a type for typeof?"); 253 // TypeQuals handled by caller. 254 Result = Context.getTypeOfType(Result); 255 break; 256 case DeclSpec::TST_typeofExpr: { 257 Expr *E = static_cast<Expr *>(DS.getTypeRep()); 258 assert(E && "Didn't get an expression for typeof?"); 259 // TypeQuals handled by caller. 260 Result = Context.getTypeOfExprType(E); 261 break; 262 } 263 case DeclSpec::TST_decltype: { 264 Expr *E = static_cast<Expr *>(DS.getTypeRep()); 265 assert(E && "Didn't get an expression for decltype?"); 266 // TypeQuals handled by caller. 267 Result = BuildDecltypeType(E); 268 if (Result.isNull()) { 269 Result = Context.IntTy; 270 isInvalid = true; 271 } 272 break; 273 } 274 case DeclSpec::TST_auto: { 275 // TypeQuals handled by caller. 276 Result = Context.UndeducedAutoTy; 277 break; 278 } 279 280 case DeclSpec::TST_error: 281 Result = Context.IntTy; 282 isInvalid = true; 283 break; 284 } 285 286 // Handle complex types. 287 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) { 288 if (getLangOptions().Freestanding) 289 Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex); 290 Result = Context.getComplexType(Result); 291 } 292 293 assert(DS.getTypeSpecComplex() != DeclSpec::TSC_imaginary && 294 "FIXME: imaginary types not supported yet!"); 295 296 // See if there are any attributes on the declspec that apply to the type (as 297 // opposed to the decl). 298 if (const AttributeList *AL = DS.getAttributes()) 299 ProcessTypeAttributeList(Result, AL); 300 301 // Apply const/volatile/restrict qualifiers to T. 302 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 303 304 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 305 // or incomplete types shall not be restrict-qualified." C++ also allows 306 // restrict-qualified references. 307 if (TypeQuals & QualType::Restrict) { 308 if (Result->isPointerType() || Result->isReferenceType()) { 309 QualType EltTy = Result->isPointerType() ? 310 Result->getAs<PointerType>()->getPointeeType() : 311 Result->getAs<ReferenceType>()->getPointeeType(); 312 313 // If we have a pointer or reference, the pointee must have an object 314 // incomplete type. 315 if (!EltTy->isIncompleteOrObjectType()) { 316 Diag(DS.getRestrictSpecLoc(), 317 diag::err_typecheck_invalid_restrict_invalid_pointee) 318 << EltTy << DS.getSourceRange(); 319 TypeQuals &= ~QualType::Restrict; // Remove the restrict qualifier. 320 } 321 } else { 322 Diag(DS.getRestrictSpecLoc(), 323 diag::err_typecheck_invalid_restrict_not_pointer) 324 << Result << DS.getSourceRange(); 325 TypeQuals &= ~QualType::Restrict; // Remove the restrict qualifier. 326 } 327 } 328 329 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification 330 // of a function type includes any type qualifiers, the behavior is 331 // undefined." 332 if (Result->isFunctionType() && TypeQuals) { 333 // Get some location to point at, either the C or V location. 334 SourceLocation Loc; 335 if (TypeQuals & QualType::Const) 336 Loc = DS.getConstSpecLoc(); 337 else { 338 assert((TypeQuals & QualType::Volatile) && 339 "Has CV quals but not C or V?"); 340 Loc = DS.getVolatileSpecLoc(); 341 } 342 Diag(Loc, diag::warn_typecheck_function_qualifiers) 343 << Result << DS.getSourceRange(); 344 } 345 346 // C++ [dcl.ref]p1: 347 // Cv-qualified references are ill-formed except when the 348 // cv-qualifiers are introduced through the use of a typedef 349 // (7.1.3) or of a template type argument (14.3), in which 350 // case the cv-qualifiers are ignored. 351 // FIXME: Shouldn't we be checking SCS_typedef here? 352 if (DS.getTypeSpecType() == DeclSpec::TST_typename && 353 TypeQuals && Result->isReferenceType()) { 354 TypeQuals &= ~QualType::Const; 355 TypeQuals &= ~QualType::Volatile; 356 } 357 358 Result = Result.getQualifiedType(TypeQuals); 359 } 360 return Result; 361} 362 363static std::string getPrintableNameForEntity(DeclarationName Entity) { 364 if (Entity) 365 return Entity.getAsString(); 366 367 return "type name"; 368} 369 370/// \brief Build a pointer type. 371/// 372/// \param T The type to which we'll be building a pointer. 373/// 374/// \param Quals The cvr-qualifiers to be applied to the pointer type. 375/// 376/// \param Loc The location of the entity whose type involves this 377/// pointer type or, if there is no such entity, the location of the 378/// type that will have pointer type. 379/// 380/// \param Entity The name of the entity that involves the pointer 381/// type, if known. 382/// 383/// \returns A suitable pointer type, if there are no 384/// errors. Otherwise, returns a NULL type. 385QualType Sema::BuildPointerType(QualType T, unsigned Quals, 386 SourceLocation Loc, DeclarationName Entity) { 387 if (T->isReferenceType()) { 388 // C++ 8.3.2p4: There shall be no ... pointers to references ... 389 Diag(Loc, diag::err_illegal_decl_pointer_to_reference) 390 << getPrintableNameForEntity(Entity); 391 return QualType(); 392 } 393 394 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 395 // object or incomplete types shall not be restrict-qualified." 396 if ((Quals & QualType::Restrict) && !T->isIncompleteOrObjectType()) { 397 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 398 << T; 399 Quals &= ~QualType::Restrict; 400 } 401 402 // Build the pointer type. 403 return Context.getPointerType(T).getQualifiedType(Quals); 404} 405 406/// \brief Build a reference type. 407/// 408/// \param T The type to which we'll be building a reference. 409/// 410/// \param Quals The cvr-qualifiers to be applied to the reference type. 411/// 412/// \param Loc The location of the entity whose type involves this 413/// reference type or, if there is no such entity, the location of the 414/// type that will have reference type. 415/// 416/// \param Entity The name of the entity that involves the reference 417/// type, if known. 418/// 419/// \returns A suitable reference type, if there are no 420/// errors. Otherwise, returns a NULL type. 421QualType Sema::BuildReferenceType(QualType T, bool LValueRef, unsigned Quals, 422 SourceLocation Loc, DeclarationName Entity) { 423 if (LValueRef) { 424 if (const RValueReferenceType *R = T->getAs<RValueReferenceType>()) { 425 // C++0x [dcl.typedef]p9: If a typedef TD names a type that is a 426 // reference to a type T, and attempt to create the type "lvalue 427 // reference to cv TD" creates the type "lvalue reference to T". 428 // We use the qualifiers (restrict or none) of the original reference, 429 // not the new ones. This is consistent with GCC. 430 return Context.getLValueReferenceType(R->getPointeeType()). 431 getQualifiedType(T.getCVRQualifiers()); 432 } 433 } 434 if (T->isReferenceType()) { 435 // C++ [dcl.ref]p4: There shall be no references to references. 436 // 437 // According to C++ DR 106, references to references are only 438 // diagnosed when they are written directly (e.g., "int & &"), 439 // but not when they happen via a typedef: 440 // 441 // typedef int& intref; 442 // typedef intref& intref2; 443 // 444 // Parser::ParserDeclaratorInternal diagnoses the case where 445 // references are written directly; here, we handle the 446 // collapsing of references-to-references as described in C++ 447 // DR 106 and amended by C++ DR 540. 448 return T; 449 } 450 451 // C++ [dcl.ref]p1: 452 // A declarator that specifies the type "reference to cv void" 453 // is ill-formed. 454 if (T->isVoidType()) { 455 Diag(Loc, diag::err_reference_to_void); 456 return QualType(); 457 } 458 459 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 460 // object or incomplete types shall not be restrict-qualified." 461 if ((Quals & QualType::Restrict) && !T->isIncompleteOrObjectType()) { 462 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 463 << T; 464 Quals &= ~QualType::Restrict; 465 } 466 467 // C++ [dcl.ref]p1: 468 // [...] Cv-qualified references are ill-formed except when the 469 // cv-qualifiers are introduced through the use of a typedef 470 // (7.1.3) or of a template type argument (14.3), in which case 471 // the cv-qualifiers are ignored. 472 // 473 // We diagnose extraneous cv-qualifiers for the non-typedef, 474 // non-template type argument case within the parser. Here, we just 475 // ignore any extraneous cv-qualifiers. 476 Quals &= ~QualType::Const; 477 Quals &= ~QualType::Volatile; 478 479 // Handle restrict on references. 480 if (LValueRef) 481 return Context.getLValueReferenceType(T).getQualifiedType(Quals); 482 return Context.getRValueReferenceType(T).getQualifiedType(Quals); 483} 484 485/// \brief Build an array type. 486/// 487/// \param T The type of each element in the array. 488/// 489/// \param ASM C99 array size modifier (e.g., '*', 'static'). 490/// 491/// \param ArraySize Expression describing the size of the array. 492/// 493/// \param Quals The cvr-qualifiers to be applied to the array's 494/// element type. 495/// 496/// \param Loc The location of the entity whose type involves this 497/// array type or, if there is no such entity, the location of the 498/// type that will have array type. 499/// 500/// \param Entity The name of the entity that involves the array 501/// type, if known. 502/// 503/// \returns A suitable array type, if there are no errors. Otherwise, 504/// returns a NULL type. 505QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM, 506 Expr *ArraySize, unsigned Quals, 507 SourceRange Brackets, DeclarationName Entity) { 508 SourceLocation Loc = Brackets.getBegin(); 509 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 510 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 511 if (RequireCompleteType(Loc, T, 512 diag::err_illegal_decl_array_incomplete_type)) 513 return QualType(); 514 515 if (T->isFunctionType()) { 516 Diag(Loc, diag::err_illegal_decl_array_of_functions) 517 << getPrintableNameForEntity(Entity); 518 return QualType(); 519 } 520 521 // C++ 8.3.2p4: There shall be no ... arrays of references ... 522 if (T->isReferenceType()) { 523 Diag(Loc, diag::err_illegal_decl_array_of_references) 524 << getPrintableNameForEntity(Entity); 525 return QualType(); 526 } 527 528 if (Context.getCanonicalType(T) == Context.UndeducedAutoTy) { 529 Diag(Loc, diag::err_illegal_decl_array_of_auto) 530 << getPrintableNameForEntity(Entity); 531 return QualType(); 532 } 533 534 if (const RecordType *EltTy = T->getAs<RecordType>()) { 535 // If the element type is a struct or union that contains a variadic 536 // array, accept it as a GNU extension: C99 6.7.2.1p2. 537 if (EltTy->getDecl()->hasFlexibleArrayMember()) 538 Diag(Loc, diag::ext_flexible_array_in_array) << T; 539 } else if (T->isObjCInterfaceType()) { 540 Diag(Loc, diag::err_objc_array_of_interfaces) << T; 541 return QualType(); 542 } 543 544 // C99 6.7.5.2p1: The size expression shall have integer type. 545 if (ArraySize && !ArraySize->isTypeDependent() && 546 !ArraySize->getType()->isIntegerType()) { 547 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 548 << ArraySize->getType() << ArraySize->getSourceRange(); 549 ArraySize->Destroy(Context); 550 return QualType(); 551 } 552 llvm::APSInt ConstVal(32); 553 if (!ArraySize) { 554 if (ASM == ArrayType::Star) 555 T = Context.getVariableArrayType(T, 0, ASM, Quals, Brackets); 556 else 557 T = Context.getIncompleteArrayType(T, ASM, Quals); 558 } else if (ArraySize->isValueDependent()) { 559 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets); 560 } else if (!ArraySize->isIntegerConstantExpr(ConstVal, Context) || 561 (!T->isDependentType() && !T->isConstantSizeType())) { 562 // Per C99, a variable array is an array with either a non-constant 563 // size or an element type that has a non-constant-size 564 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets); 565 } else { 566 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 567 // have a value greater than zero. 568 if (ConstVal.isSigned()) { 569 if (ConstVal.isNegative()) { 570 Diag(ArraySize->getLocStart(), 571 diag::err_typecheck_negative_array_size) 572 << ArraySize->getSourceRange(); 573 return QualType(); 574 } else if (ConstVal == 0) { 575 // GCC accepts zero sized static arrays. 576 Diag(ArraySize->getLocStart(), diag::ext_typecheck_zero_array_size) 577 << ArraySize->getSourceRange(); 578 } 579 } 580 T = Context.getConstantArrayWithExprType(T, ConstVal, ArraySize, 581 ASM, Quals, Brackets); 582 } 583 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 584 if (!getLangOptions().C99) { 585 if (ArraySize && !ArraySize->isTypeDependent() && 586 !ArraySize->isValueDependent() && 587 !ArraySize->isIntegerConstantExpr(Context)) 588 Diag(Loc, diag::ext_vla); 589 else if (ASM != ArrayType::Normal || Quals != 0) 590 Diag(Loc, diag::ext_c99_array_usage); 591 } 592 593 return T; 594} 595 596/// \brief Build an ext-vector type. 597/// 598/// Run the required checks for the extended vector type. 599QualType Sema::BuildExtVectorType(QualType T, ExprArg ArraySize, 600 SourceLocation AttrLoc) { 601 602 Expr *Arg = (Expr *)ArraySize.get(); 603 604 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 605 // in conjunction with complex types (pointers, arrays, functions, etc.). 606 if (!T->isDependentType() && 607 !T->isIntegerType() && !T->isRealFloatingType()) { 608 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T; 609 return QualType(); 610 } 611 612 if (!Arg->isTypeDependent() && !Arg->isValueDependent()) { 613 llvm::APSInt vecSize(32); 614 if (!Arg->isIntegerConstantExpr(vecSize, Context)) { 615 Diag(AttrLoc, diag::err_attribute_argument_not_int) 616 << "ext_vector_type" << Arg->getSourceRange(); 617 return QualType(); 618 } 619 620 // unlike gcc's vector_size attribute, the size is specified as the 621 // number of elements, not the number of bytes. 622 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 623 624 if (vectorSize == 0) { 625 Diag(AttrLoc, diag::err_attribute_zero_size) 626 << Arg->getSourceRange(); 627 return QualType(); 628 } 629 630 if (!T->isDependentType()) 631 return Context.getExtVectorType(T, vectorSize); 632 } 633 634 return Context.getDependentSizedExtVectorType(T, ArraySize.takeAs<Expr>(), 635 AttrLoc); 636} 637 638/// \brief Build a function type. 639/// 640/// This routine checks the function type according to C++ rules and 641/// under the assumption that the result type and parameter types have 642/// just been instantiated from a template. It therefore duplicates 643/// some of the behavior of GetTypeForDeclarator, but in a much 644/// simpler form that is only suitable for this narrow use case. 645/// 646/// \param T The return type of the function. 647/// 648/// \param ParamTypes The parameter types of the function. This array 649/// will be modified to account for adjustments to the types of the 650/// function parameters. 651/// 652/// \param NumParamTypes The number of parameter types in ParamTypes. 653/// 654/// \param Variadic Whether this is a variadic function type. 655/// 656/// \param Quals The cvr-qualifiers to be applied to the function type. 657/// 658/// \param Loc The location of the entity whose type involves this 659/// function type or, if there is no such entity, the location of the 660/// type that will have function type. 661/// 662/// \param Entity The name of the entity that involves the function 663/// type, if known. 664/// 665/// \returns A suitable function type, if there are no 666/// errors. Otherwise, returns a NULL type. 667QualType Sema::BuildFunctionType(QualType T, 668 QualType *ParamTypes, 669 unsigned NumParamTypes, 670 bool Variadic, unsigned Quals, 671 SourceLocation Loc, DeclarationName Entity) { 672 if (T->isArrayType() || T->isFunctionType()) { 673 Diag(Loc, diag::err_func_returning_array_function) << T; 674 return QualType(); 675 } 676 677 bool Invalid = false; 678 for (unsigned Idx = 0; Idx < NumParamTypes; ++Idx) { 679 QualType ParamType = adjustParameterType(ParamTypes[Idx]); 680 if (ParamType->isVoidType()) { 681 Diag(Loc, diag::err_param_with_void_type); 682 Invalid = true; 683 } 684 685 ParamTypes[Idx] = ParamType; 686 } 687 688 if (Invalid) 689 return QualType(); 690 691 return Context.getFunctionType(T, ParamTypes, NumParamTypes, Variadic, 692 Quals); 693} 694 695/// \brief Build a member pointer type \c T Class::*. 696/// 697/// \param T the type to which the member pointer refers. 698/// \param Class the class type into which the member pointer points. 699/// \param Quals Qualifiers applied to the member pointer type 700/// \param Loc the location where this type begins 701/// \param Entity the name of the entity that will have this member pointer type 702/// 703/// \returns a member pointer type, if successful, or a NULL type if there was 704/// an error. 705QualType Sema::BuildMemberPointerType(QualType T, QualType Class, 706 unsigned Quals, SourceLocation Loc, 707 DeclarationName Entity) { 708 // Verify that we're not building a pointer to pointer to function with 709 // exception specification. 710 if (CheckDistantExceptionSpec(T)) { 711 Diag(Loc, diag::err_distant_exception_spec); 712 713 // FIXME: If we're doing this as part of template instantiation, 714 // we should return immediately. 715 716 // Build the type anyway, but use the canonical type so that the 717 // exception specifiers are stripped off. 718 T = Context.getCanonicalType(T); 719 } 720 721 // C++ 8.3.3p3: A pointer to member shall not pointer to ... a member 722 // with reference type, or "cv void." 723 if (T->isReferenceType()) { 724 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference) 725 << (Entity? Entity.getAsString() : "type name"); 726 return QualType(); 727 } 728 729 if (T->isVoidType()) { 730 Diag(Loc, diag::err_illegal_decl_mempointer_to_void) 731 << (Entity? Entity.getAsString() : "type name"); 732 return QualType(); 733 } 734 735 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 736 // object or incomplete types shall not be restrict-qualified." 737 if ((Quals & QualType::Restrict) && !T->isIncompleteOrObjectType()) { 738 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 739 << T; 740 741 // FIXME: If we're doing this as part of template instantiation, 742 // we should return immediately. 743 Quals &= ~QualType::Restrict; 744 } 745 746 if (!Class->isDependentType() && !Class->isRecordType()) { 747 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class; 748 return QualType(); 749 } 750 751 return Context.getMemberPointerType(T, Class.getTypePtr()) 752 .getQualifiedType(Quals); 753} 754 755/// \brief Build a block pointer type. 756/// 757/// \param T The type to which we'll be building a block pointer. 758/// 759/// \param Quals The cvr-qualifiers to be applied to the block pointer type. 760/// 761/// \param Loc The location of the entity whose type involves this 762/// block pointer type or, if there is no such entity, the location of the 763/// type that will have block pointer type. 764/// 765/// \param Entity The name of the entity that involves the block pointer 766/// type, if known. 767/// 768/// \returns A suitable block pointer type, if there are no 769/// errors. Otherwise, returns a NULL type. 770QualType Sema::BuildBlockPointerType(QualType T, unsigned Quals, 771 SourceLocation Loc, 772 DeclarationName Entity) { 773 if (!T.getTypePtr()->isFunctionType()) { 774 Diag(Loc, diag::err_nonfunction_block_type); 775 return QualType(); 776 } 777 778 return Context.getBlockPointerType(T).getQualifiedType(Quals); 779} 780 781QualType Sema::GetTypeFromParser(TypeTy *Ty, DeclaratorInfo **DInfo) { 782 QualType QT = QualType::getFromOpaquePtr(Ty); 783 DeclaratorInfo *DI = 0; 784 if (LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) { 785 QT = LIT->getType(); 786 DI = LIT->getDeclaratorInfo(); 787 } 788 789 if (DInfo) *DInfo = DI; 790 return QT; 791} 792 793/// GetTypeForDeclarator - Convert the type for the specified 794/// declarator to Type instances. Skip the outermost Skip type 795/// objects. 796/// 797/// If OwnedDecl is non-NULL, and this declarator's decl-specifier-seq 798/// owns the declaration of a type (e.g., the definition of a struct 799/// type), then *OwnedDecl will receive the owned declaration. 800QualType Sema::GetTypeForDeclarator(Declarator &D, Scope *S, 801 DeclaratorInfo **DInfo, unsigned Skip, 802 TagDecl **OwnedDecl) { 803 bool OmittedReturnType = false; 804 805 if (D.getContext() == Declarator::BlockLiteralContext 806 && Skip == 0 807 && !D.getDeclSpec().hasTypeSpecifier() 808 && (D.getNumTypeObjects() == 0 809 || (D.getNumTypeObjects() == 1 810 && D.getTypeObject(0).Kind == DeclaratorChunk::Function))) 811 OmittedReturnType = true; 812 813 // long long is a C99 feature. 814 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 815 D.getDeclSpec().getTypeSpecWidth() == DeclSpec::TSW_longlong) 816 Diag(D.getDeclSpec().getTypeSpecWidthLoc(), diag::ext_longlong); 817 818 // Determine the type of the declarator. Not all forms of declarator 819 // have a type. 820 QualType T; 821 switch (D.getKind()) { 822 case Declarator::DK_Abstract: 823 case Declarator::DK_Normal: 824 case Declarator::DK_Operator: { 825 const DeclSpec &DS = D.getDeclSpec(); 826 if (OmittedReturnType) { 827 // We default to a dependent type initially. Can be modified by 828 // the first return statement. 829 T = Context.DependentTy; 830 } else { 831 bool isInvalid = false; 832 T = ConvertDeclSpecToType(DS, D.getIdentifierLoc(), isInvalid); 833 if (isInvalid) 834 D.setInvalidType(true); 835 else if (OwnedDecl && DS.isTypeSpecOwned()) 836 *OwnedDecl = cast<TagDecl>((Decl *)DS.getTypeRep()); 837 } 838 break; 839 } 840 841 case Declarator::DK_Constructor: 842 case Declarator::DK_Destructor: 843 case Declarator::DK_Conversion: 844 // Constructors and destructors don't have return types. Use 845 // "void" instead. Conversion operators will check their return 846 // types separately. 847 T = Context.VoidTy; 848 break; 849 } 850 851 if (T == Context.UndeducedAutoTy) { 852 int Error = -1; 853 854 switch (D.getContext()) { 855 case Declarator::KNRTypeListContext: 856 assert(0 && "K&R type lists aren't allowed in C++"); 857 break; 858 case Declarator::PrototypeContext: 859 Error = 0; // Function prototype 860 break; 861 case Declarator::MemberContext: 862 switch (cast<TagDecl>(CurContext)->getTagKind()) { 863 case TagDecl::TK_enum: assert(0 && "unhandled tag kind"); break; 864 case TagDecl::TK_struct: Error = 1; /* Struct member */ break; 865 case TagDecl::TK_union: Error = 2; /* Union member */ break; 866 case TagDecl::TK_class: Error = 3; /* Class member */ break; 867 } 868 break; 869 case Declarator::CXXCatchContext: 870 Error = 4; // Exception declaration 871 break; 872 case Declarator::TemplateParamContext: 873 Error = 5; // Template parameter 874 break; 875 case Declarator::BlockLiteralContext: 876 Error = 6; // Block literal 877 break; 878 case Declarator::FileContext: 879 case Declarator::BlockContext: 880 case Declarator::ForContext: 881 case Declarator::ConditionContext: 882 case Declarator::TypeNameContext: 883 break; 884 } 885 886 if (Error != -1) { 887 Diag(D.getDeclSpec().getTypeSpecTypeLoc(), diag::err_auto_not_allowed) 888 << Error; 889 T = Context.IntTy; 890 D.setInvalidType(true); 891 } 892 } 893 894 // The name we're declaring, if any. 895 DeclarationName Name; 896 if (D.getIdentifier()) 897 Name = D.getIdentifier(); 898 899 bool ShouldBuildInfo = DInfo != 0; 900 // The QualType referring to the type as written as source code. We can't use 901 // T because it can change due to semantic analysis. 902 QualType SourceTy = T; 903 904 // Walk the DeclTypeInfo, building the recursive type as we go. 905 // DeclTypeInfos are ordered from the identifier out, which is 906 // opposite of what we want :). 907 for (unsigned i = Skip, e = D.getNumTypeObjects(); i != e; ++i) { 908 DeclaratorChunk &DeclType = D.getTypeObject(e-i-1+Skip); 909 switch (DeclType.Kind) { 910 default: assert(0 && "Unknown decltype!"); 911 case DeclaratorChunk::BlockPointer: 912 if (ShouldBuildInfo) { 913 if (SourceTy->isFunctionType()) 914 SourceTy = Context.getBlockPointerType(SourceTy) 915 .getQualifiedType(DeclType.Cls.TypeQuals); 916 else 917 // If not function type Context::getBlockPointerType asserts, 918 // so just give up. 919 ShouldBuildInfo = false; 920 } 921 922 // If blocks are disabled, emit an error. 923 if (!LangOpts.Blocks) 924 Diag(DeclType.Loc, diag::err_blocks_disable); 925 926 T = BuildBlockPointerType(T, DeclType.Cls.TypeQuals, D.getIdentifierLoc(), 927 Name); 928 break; 929 case DeclaratorChunk::Pointer: 930 //FIXME: Use ObjCObjectPointer for info when appropriate. 931 if (ShouldBuildInfo) 932 SourceTy = Context.getPointerType(SourceTy) 933 .getQualifiedType(DeclType.Ptr.TypeQuals); 934 // Verify that we're not building a pointer to pointer to function with 935 // exception specification. 936 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 937 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 938 D.setInvalidType(true); 939 // Build the type anyway. 940 } 941 if (getLangOptions().ObjC1 && T->isObjCInterfaceType()) { 942 const ObjCInterfaceType *OIT = T->getAsObjCInterfaceType(); 943 T = Context.getObjCObjectPointerType(T, 944 (ObjCProtocolDecl **)OIT->qual_begin(), 945 OIT->getNumProtocols()); 946 break; 947 } 948 T = BuildPointerType(T, DeclType.Ptr.TypeQuals, DeclType.Loc, Name); 949 break; 950 case DeclaratorChunk::Reference: 951 if (ShouldBuildInfo) { 952 if (DeclType.Ref.LValueRef) 953 SourceTy = Context.getLValueReferenceType(SourceTy); 954 else 955 SourceTy = Context.getRValueReferenceType(SourceTy); 956 unsigned Quals = DeclType.Ref.HasRestrict ? QualType::Restrict : 0; 957 SourceTy = SourceTy.getQualifiedType(Quals); 958 } 959 960 // Verify that we're not building a reference to pointer to function with 961 // exception specification. 962 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 963 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 964 D.setInvalidType(true); 965 // Build the type anyway. 966 } 967 T = BuildReferenceType(T, DeclType.Ref.LValueRef, 968 DeclType.Ref.HasRestrict ? QualType::Restrict : 0, 969 DeclType.Loc, Name); 970 break; 971 case DeclaratorChunk::Array: { 972 if (ShouldBuildInfo) 973 // We just need to get an array type, the exact type doesn't matter. 974 SourceTy = Context.getIncompleteArrayType(SourceTy, ArrayType::Normal, 975 DeclType.Arr.TypeQuals); 976 977 // Verify that we're not building an array of pointers to function with 978 // exception specification. 979 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 980 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 981 D.setInvalidType(true); 982 // Build the type anyway. 983 } 984 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 985 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 986 ArrayType::ArraySizeModifier ASM; 987 if (ATI.isStar) 988 ASM = ArrayType::Star; 989 else if (ATI.hasStatic) 990 ASM = ArrayType::Static; 991 else 992 ASM = ArrayType::Normal; 993 if (ASM == ArrayType::Star && 994 D.getContext() != Declarator::PrototypeContext) { 995 // FIXME: This check isn't quite right: it allows star in prototypes 996 // for function definitions, and disallows some edge cases detailed 997 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html 998 Diag(DeclType.Loc, diag::err_array_star_outside_prototype); 999 ASM = ArrayType::Normal; 1000 D.setInvalidType(true); 1001 } 1002 T = BuildArrayType(T, ASM, ArraySize, ATI.TypeQuals, 1003 SourceRange(DeclType.Loc, DeclType.EndLoc), Name); 1004 break; 1005 } 1006 case DeclaratorChunk::Function: { 1007 if (ShouldBuildInfo) { 1008 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 1009 llvm::SmallVector<QualType, 16> ArgTys; 1010 1011 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 1012 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 1013 if (Param) 1014 ArgTys.push_back(Param->getType()); 1015 } 1016 SourceTy = Context.getFunctionType(SourceTy, ArgTys.data(), 1017 ArgTys.size(), 1018 FTI.isVariadic, FTI.TypeQuals); 1019 } 1020 1021 // If the function declarator has a prototype (i.e. it is not () and 1022 // does not have a K&R-style identifier list), then the arguments are part 1023 // of the type, otherwise the argument list is (). 1024 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 1025 1026 // C99 6.7.5.3p1: The return type may not be a function or array type. 1027 if (T->isArrayType() || T->isFunctionType()) { 1028 Diag(DeclType.Loc, diag::err_func_returning_array_function) << T; 1029 T = Context.IntTy; 1030 D.setInvalidType(true); 1031 } 1032 1033 if (getLangOptions().CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) { 1034 // C++ [dcl.fct]p6: 1035 // Types shall not be defined in return or parameter types. 1036 TagDecl *Tag = cast<TagDecl>((Decl *)D.getDeclSpec().getTypeRep()); 1037 if (Tag->isDefinition()) 1038 Diag(Tag->getLocation(), diag::err_type_defined_in_result_type) 1039 << Context.getTypeDeclType(Tag); 1040 } 1041 1042 // Exception specs are not allowed in typedefs. Complain, but add it 1043 // anyway. 1044 if (FTI.hasExceptionSpec && 1045 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1046 Diag(FTI.getThrowLoc(), diag::err_exception_spec_in_typedef); 1047 1048 if (FTI.NumArgs == 0) { 1049 if (getLangOptions().CPlusPlus) { 1050 // C++ 8.3.5p2: If the parameter-declaration-clause is empty, the 1051 // function takes no arguments. 1052 llvm::SmallVector<QualType, 4> Exceptions; 1053 Exceptions.reserve(FTI.NumExceptions); 1054 for(unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) { 1055 // FIXME: Preserve type source info. 1056 QualType ET = GetTypeFromParser(FTI.Exceptions[ei].Ty); 1057 // Check that the type is valid for an exception spec, and drop it 1058 // if not. 1059 if (!CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range)) 1060 Exceptions.push_back(ET); 1061 } 1062 T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic, FTI.TypeQuals, 1063 FTI.hasExceptionSpec, 1064 FTI.hasAnyExceptionSpec, 1065 Exceptions.size(), Exceptions.data()); 1066 } else if (FTI.isVariadic) { 1067 // We allow a zero-parameter variadic function in C if the 1068 // function is marked with the "overloadable" 1069 // attribute. Scan for this attribute now. 1070 bool Overloadable = false; 1071 for (const AttributeList *Attrs = D.getAttributes(); 1072 Attrs; Attrs = Attrs->getNext()) { 1073 if (Attrs->getKind() == AttributeList::AT_overloadable) { 1074 Overloadable = true; 1075 break; 1076 } 1077 } 1078 1079 if (!Overloadable) 1080 Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); 1081 T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic, 0); 1082 } else { 1083 // Simple void foo(), where the incoming T is the result type. 1084 T = Context.getFunctionNoProtoType(T); 1085 } 1086 } else if (FTI.ArgInfo[0].Param == 0) { 1087 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function definition. 1088 Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 1089 } else { 1090 // Otherwise, we have a function with an argument list that is 1091 // potentially variadic. 1092 llvm::SmallVector<QualType, 16> ArgTys; 1093 1094 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 1095 ParmVarDecl *Param = 1096 cast<ParmVarDecl>(FTI.ArgInfo[i].Param.getAs<Decl>()); 1097 QualType ArgTy = Param->getType(); 1098 assert(!ArgTy.isNull() && "Couldn't parse type?"); 1099 1100 // Adjust the parameter type. 1101 assert((ArgTy == adjustParameterType(ArgTy)) && "Unadjusted type?"); 1102 1103 // Look for 'void'. void is allowed only as a single argument to a 1104 // function with no other parameters (C99 6.7.5.3p10). We record 1105 // int(void) as a FunctionProtoType with an empty argument list. 1106 if (ArgTy->isVoidType()) { 1107 // If this is something like 'float(int, void)', reject it. 'void' 1108 // is an incomplete type (C99 6.2.5p19) and function decls cannot 1109 // have arguments of incomplete type. 1110 if (FTI.NumArgs != 1 || FTI.isVariadic) { 1111 Diag(DeclType.Loc, diag::err_void_only_param); 1112 ArgTy = Context.IntTy; 1113 Param->setType(ArgTy); 1114 } else if (FTI.ArgInfo[i].Ident) { 1115 // Reject, but continue to parse 'int(void abc)'. 1116 Diag(FTI.ArgInfo[i].IdentLoc, 1117 diag::err_param_with_void_type); 1118 ArgTy = Context.IntTy; 1119 Param->setType(ArgTy); 1120 } else { 1121 // Reject, but continue to parse 'float(const void)'. 1122 if (ArgTy.getCVRQualifiers()) 1123 Diag(DeclType.Loc, diag::err_void_param_qualified); 1124 1125 // Do not add 'void' to the ArgTys list. 1126 break; 1127 } 1128 } else if (!FTI.hasPrototype) { 1129 if (ArgTy->isPromotableIntegerType()) { 1130 ArgTy = Context.IntTy; 1131 } else if (const BuiltinType* BTy = ArgTy->getAsBuiltinType()) { 1132 if (BTy->getKind() == BuiltinType::Float) 1133 ArgTy = Context.DoubleTy; 1134 } 1135 } 1136 1137 ArgTys.push_back(ArgTy); 1138 } 1139 1140 llvm::SmallVector<QualType, 4> Exceptions; 1141 Exceptions.reserve(FTI.NumExceptions); 1142 for(unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) { 1143 // FIXME: Preserve type source info. 1144 QualType ET = GetTypeFromParser(FTI.Exceptions[ei].Ty); 1145 // Check that the type is valid for an exception spec, and drop it if 1146 // not. 1147 if (!CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range)) 1148 Exceptions.push_back(ET); 1149 } 1150 1151 T = Context.getFunctionType(T, ArgTys.data(), ArgTys.size(), 1152 FTI.isVariadic, FTI.TypeQuals, 1153 FTI.hasExceptionSpec, 1154 FTI.hasAnyExceptionSpec, 1155 Exceptions.size(), Exceptions.data()); 1156 } 1157 break; 1158 } 1159 case DeclaratorChunk::MemberPointer: 1160 // Verify that we're not building a pointer to pointer to function with 1161 // exception specification. 1162 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 1163 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 1164 D.setInvalidType(true); 1165 // Build the type anyway. 1166 } 1167 // The scope spec must refer to a class, or be dependent. 1168 QualType ClsType; 1169 if (isDependentScopeSpecifier(DeclType.Mem.Scope())) { 1170 NestedNameSpecifier *NNS 1171 = (NestedNameSpecifier *)DeclType.Mem.Scope().getScopeRep(); 1172 assert(NNS->getAsType() && "Nested-name-specifier must name a type"); 1173 ClsType = QualType(NNS->getAsType(), 0); 1174 } else if (CXXRecordDecl *RD 1175 = dyn_cast_or_null<CXXRecordDecl>( 1176 computeDeclContext(DeclType.Mem.Scope()))) { 1177 ClsType = Context.getTagDeclType(RD); 1178 } else { 1179 Diag(DeclType.Mem.Scope().getBeginLoc(), 1180 diag::err_illegal_decl_mempointer_in_nonclass) 1181 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 1182 << DeclType.Mem.Scope().getRange(); 1183 D.setInvalidType(true); 1184 } 1185 1186 if (ShouldBuildInfo) { 1187 QualType cls = !ClsType.isNull() ? ClsType : Context.IntTy; 1188 SourceTy = Context.getMemberPointerType(SourceTy, cls.getTypePtr()) 1189 .getQualifiedType(DeclType.Mem.TypeQuals); 1190 } 1191 1192 if (!ClsType.isNull()) 1193 T = BuildMemberPointerType(T, ClsType, DeclType.Mem.TypeQuals, 1194 DeclType.Loc, D.getIdentifier()); 1195 if (T.isNull()) { 1196 T = Context.IntTy; 1197 D.setInvalidType(true); 1198 } 1199 break; 1200 } 1201 1202 if (T.isNull()) { 1203 D.setInvalidType(true); 1204 T = Context.IntTy; 1205 } 1206 1207 // See if there are any attributes on this declarator chunk. 1208 if (const AttributeList *AL = DeclType.getAttrs()) 1209 ProcessTypeAttributeList(T, AL); 1210 } 1211 1212 if (getLangOptions().CPlusPlus && T->isFunctionType()) { 1213 const FunctionProtoType *FnTy = T->getAsFunctionProtoType(); 1214 assert(FnTy && "Why oh why is there not a FunctionProtoType here ?"); 1215 1216 // C++ 8.3.5p4: A cv-qualifier-seq shall only be part of the function type 1217 // for a nonstatic member function, the function type to which a pointer 1218 // to member refers, or the top-level function type of a function typedef 1219 // declaration. 1220 if (FnTy->getTypeQuals() != 0 && 1221 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 1222 ((D.getContext() != Declarator::MemberContext && 1223 (!D.getCXXScopeSpec().isSet() || 1224 !computeDeclContext(D.getCXXScopeSpec(), /*FIXME:*/true) 1225 ->isRecord())) || 1226 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static)) { 1227 if (D.isFunctionDeclarator()) 1228 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_function_type); 1229 else 1230 Diag(D.getIdentifierLoc(), 1231 diag::err_invalid_qualified_typedef_function_type_use); 1232 1233 // Strip the cv-quals from the type. 1234 T = Context.getFunctionType(FnTy->getResultType(), FnTy->arg_type_begin(), 1235 FnTy->getNumArgs(), FnTy->isVariadic(), 0); 1236 } 1237 } 1238 1239 // If there were any type attributes applied to the decl itself (not the 1240 // type, apply the type attribute to the type!) 1241 if (const AttributeList *Attrs = D.getAttributes()) 1242 ProcessTypeAttributeList(T, Attrs); 1243 1244 if (ShouldBuildInfo) 1245 *DInfo = GetDeclaratorInfoForDeclarator(D, SourceTy, Skip); 1246 1247 return T; 1248} 1249 1250/// \brief Create and instantiate a DeclaratorInfo with type source information. 1251/// 1252/// \param T QualType referring to the type as written in source code. 1253DeclaratorInfo * 1254Sema::GetDeclaratorInfoForDeclarator(Declarator &D, QualType T, unsigned Skip) { 1255 DeclaratorInfo *DInfo = Context.CreateDeclaratorInfo(T); 1256 TypeLoc CurrTL = DInfo->getTypeLoc(); 1257 1258 for (unsigned i = Skip, e = D.getNumTypeObjects(); i != e; ++i) { 1259 assert(!CurrTL.isNull()); 1260 1261 DeclaratorChunk &DeclType = D.getTypeObject(i); 1262 switch (DeclType.Kind) { 1263 default: assert(0 && "Unknown decltype!"); 1264 case DeclaratorChunk::BlockPointer: { 1265 BlockPointerLoc &BPL = cast<BlockPointerLoc>(CurrTL); 1266 BPL.setCaretLoc(DeclType.Loc); 1267 break; 1268 } 1269 case DeclaratorChunk::Pointer: { 1270 //FIXME: ObjCObject pointers. 1271 PointerLoc &PL = cast<PointerLoc>(CurrTL); 1272 PL.setStarLoc(DeclType.Loc); 1273 break; 1274 } 1275 case DeclaratorChunk::Reference: { 1276 ReferenceLoc &RL = cast<ReferenceLoc>(CurrTL); 1277 RL.setAmpLoc(DeclType.Loc); 1278 break; 1279 } 1280 case DeclaratorChunk::Array: { 1281 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 1282 ArrayLoc &AL = cast<ArrayLoc>(CurrTL); 1283 AL.setLBracketLoc(DeclType.Loc); 1284 AL.setRBracketLoc(DeclType.EndLoc); 1285 AL.setSizeExpr(static_cast<Expr*>(ATI.NumElts)); 1286 //FIXME: Star location for [*]. 1287 break; 1288 } 1289 case DeclaratorChunk::Function: { 1290 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 1291 FunctionLoc &FL = cast<FunctionLoc>(CurrTL); 1292 FL.setLParenLoc(DeclType.Loc); 1293 FL.setRParenLoc(DeclType.EndLoc); 1294 for (unsigned i = 0, e = FTI.NumArgs, tpi = 0; i != e; ++i) { 1295 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 1296 if (Param) { 1297 assert(tpi < FL.getNumArgs()); 1298 FL.setArg(tpi++, Param); 1299 } 1300 } 1301 break; 1302 //FIXME: Exception specs. 1303 } 1304 case DeclaratorChunk::MemberPointer: { 1305 MemberPointerLoc &MPL = cast<MemberPointerLoc>(CurrTL); 1306 MPL.setStarLoc(DeclType.Loc); 1307 //FIXME: Class location. 1308 break; 1309 } 1310 1311 } 1312 1313 CurrTL = CurrTL.getNextTypeLoc(); 1314 } 1315 1316 if (TypedefLoc *TL = dyn_cast<TypedefLoc>(&CurrTL)) { 1317 TL->setNameLoc(D.getDeclSpec().getTypeSpecTypeLoc()); 1318 } else { 1319 //FIXME: Other typespecs. 1320 DefaultTypeSpecLoc &DTL = cast<DefaultTypeSpecLoc>(CurrTL); 1321 DTL.setStartLoc(D.getDeclSpec().getTypeSpecTypeLoc()); 1322 } 1323 1324 return DInfo; 1325} 1326 1327/// \brief Create a LocInfoType to hold the given QualType and DeclaratorInfo. 1328QualType Sema::CreateLocInfoType(QualType T, DeclaratorInfo *DInfo) { 1329 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser 1330 // and Sema during declaration parsing. Try deallocating/caching them when 1331 // it's appropriate, instead of allocating them and keeping them around. 1332 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType), 8); 1333 new (LocT) LocInfoType(T, DInfo); 1334 assert(LocT->getTypeClass() != T->getTypeClass() && 1335 "LocInfoType's TypeClass conflicts with an existing Type class"); 1336 return QualType(LocT, 0); 1337} 1338 1339void LocInfoType::getAsStringInternal(std::string &Str, 1340 const PrintingPolicy &Policy) const { 1341 assert(false && "LocInfoType should not be used in the type system"); 1342} 1343 1344/// CheckSpecifiedExceptionType - Check if the given type is valid in an 1345/// exception specification. Incomplete types, or pointers to incomplete types 1346/// other than void are not allowed. 1347bool Sema::CheckSpecifiedExceptionType(QualType T, const SourceRange &Range) { 1348 // FIXME: This may not correctly work with the fix for core issue 437, 1349 // where a class's own type is considered complete within its body. 1350 1351 // C++ 15.4p2: A type denoted in an exception-specification shall not denote 1352 // an incomplete type. 1353 if (T->isIncompleteType()) 1354 return Diag(Range.getBegin(), diag::err_incomplete_in_exception_spec) 1355 << Range << T << /*direct*/0; 1356 1357 // C++ 15.4p2: A type denoted in an exception-specification shall not denote 1358 // an incomplete type a pointer or reference to an incomplete type, other 1359 // than (cv) void*. 1360 int kind; 1361 if (const PointerType* IT = T->getAs<PointerType>()) { 1362 T = IT->getPointeeType(); 1363 kind = 1; 1364 } else if (const ReferenceType* IT = T->getAs<ReferenceType>()) { 1365 T = IT->getPointeeType(); 1366 kind = 2; 1367 } else 1368 return false; 1369 1370 if (T->isIncompleteType() && !T->isVoidType()) 1371 return Diag(Range.getBegin(), diag::err_incomplete_in_exception_spec) 1372 << Range << T << /*indirect*/kind; 1373 1374 return false; 1375} 1376 1377/// CheckDistantExceptionSpec - Check if the given type is a pointer or pointer 1378/// to member to a function with an exception specification. This means that 1379/// it is invalid to add another level of indirection. 1380bool Sema::CheckDistantExceptionSpec(QualType T) { 1381 if (const PointerType *PT = T->getAs<PointerType>()) 1382 T = PT->getPointeeType(); 1383 else if (const MemberPointerType *PT = T->getAs<MemberPointerType>()) 1384 T = PT->getPointeeType(); 1385 else 1386 return false; 1387 1388 const FunctionProtoType *FnT = T->getAsFunctionProtoType(); 1389 if (!FnT) 1390 return false; 1391 1392 return FnT->hasExceptionSpec(); 1393} 1394 1395/// CheckEquivalentExceptionSpec - Check if the two types have equivalent 1396/// exception specifications. Exception specifications are equivalent if 1397/// they allow exactly the same set of exception types. It does not matter how 1398/// that is achieved. See C++ [except.spec]p2. 1399bool Sema::CheckEquivalentExceptionSpec( 1400 const FunctionProtoType *Old, SourceLocation OldLoc, 1401 const FunctionProtoType *New, SourceLocation NewLoc) { 1402 bool OldAny = !Old->hasExceptionSpec() || Old->hasAnyExceptionSpec(); 1403 bool NewAny = !New->hasExceptionSpec() || New->hasAnyExceptionSpec(); 1404 if (OldAny && NewAny) 1405 return false; 1406 if (OldAny || NewAny) { 1407 Diag(NewLoc, diag::err_mismatched_exception_spec); 1408 Diag(OldLoc, diag::note_previous_declaration); 1409 return true; 1410 } 1411 1412 bool Success = true; 1413 // Both have a definite exception spec. Collect the first set, then compare 1414 // to the second. 1415 llvm::SmallPtrSet<const Type*, 8> Types; 1416 for (FunctionProtoType::exception_iterator I = Old->exception_begin(), 1417 E = Old->exception_end(); I != E; ++I) 1418 Types.insert(Context.getCanonicalType(*I).getTypePtr()); 1419 1420 for (FunctionProtoType::exception_iterator I = New->exception_begin(), 1421 E = New->exception_end(); I != E && Success; ++I) 1422 Success = Types.erase(Context.getCanonicalType(*I).getTypePtr()); 1423 1424 Success = Success && Types.empty(); 1425 1426 if (Success) { 1427 return false; 1428 } 1429 Diag(NewLoc, diag::err_mismatched_exception_spec); 1430 Diag(OldLoc, diag::note_previous_declaration); 1431 return true; 1432} 1433 1434/// CheckExceptionSpecSubset - Check whether the second function type's 1435/// exception specification is a subset (or equivalent) of the first function 1436/// type. This is used by override and pointer assignment checks. 1437bool Sema::CheckExceptionSpecSubset(unsigned DiagID, unsigned NoteID, 1438 const FunctionProtoType *Superset, SourceLocation SuperLoc, 1439 const FunctionProtoType *Subset, SourceLocation SubLoc) 1440{ 1441 // FIXME: As usual, we could be more specific in our error messages, but 1442 // that better waits until we've got types with source locations. 1443 1444 // If superset contains everything, we're done. 1445 if (!Superset->hasExceptionSpec() || Superset->hasAnyExceptionSpec()) 1446 return false; 1447 1448 // It does not. If the subset contains everything, we've failed. 1449 if (!Subset->hasExceptionSpec() || Subset->hasAnyExceptionSpec()) { 1450 Diag(SubLoc, DiagID); 1451 Diag(SuperLoc, NoteID); 1452 return true; 1453 } 1454 1455 // Neither contains everything. Do a proper comparison. 1456 for (FunctionProtoType::exception_iterator SubI = Subset->exception_begin(), 1457 SubE = Subset->exception_end(); SubI != SubE; ++SubI) { 1458 // Take one type from the subset. 1459 QualType CanonicalSubT = Context.getCanonicalType(*SubI); 1460 bool SubIsPointer = false; 1461 if (const ReferenceType *RefTy = CanonicalSubT->getAs<ReferenceType>()) 1462 CanonicalSubT = RefTy->getPointeeType(); 1463 if (const PointerType *PtrTy = CanonicalSubT->getAs<PointerType>()) { 1464 CanonicalSubT = PtrTy->getPointeeType(); 1465 SubIsPointer = true; 1466 } 1467 bool SubIsClass = CanonicalSubT->isRecordType(); 1468 CanonicalSubT.setCVRQualifiers(0); 1469 1470 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1471 /*DetectVirtual=*/false); 1472 1473 bool Contained = false; 1474 // Make sure it's in the superset. 1475 for (FunctionProtoType::exception_iterator SuperI = 1476 Superset->exception_begin(), SuperE = Superset->exception_end(); 1477 SuperI != SuperE; ++SuperI) { 1478 QualType CanonicalSuperT = Context.getCanonicalType(*SuperI); 1479 // SubT must be SuperT or derived from it, or pointer or reference to 1480 // such types. 1481 if (const ReferenceType *RefTy = CanonicalSuperT->getAs<ReferenceType>()) 1482 CanonicalSuperT = RefTy->getPointeeType(); 1483 if (SubIsPointer) { 1484 if (const PointerType *PtrTy = CanonicalSuperT->getAs<PointerType>()) 1485 CanonicalSuperT = PtrTy->getPointeeType(); 1486 else { 1487 continue; 1488 } 1489 } 1490 CanonicalSuperT.setCVRQualifiers(0); 1491 // If the types are the same, move on to the next type in the subset. 1492 if (CanonicalSubT == CanonicalSuperT) { 1493 Contained = true; 1494 break; 1495 } 1496 1497 // Otherwise we need to check the inheritance. 1498 if (!SubIsClass || !CanonicalSuperT->isRecordType()) 1499 continue; 1500 1501 Paths.clear(); 1502 if (!IsDerivedFrom(CanonicalSubT, CanonicalSuperT, Paths)) 1503 continue; 1504 1505 if (Paths.isAmbiguous(CanonicalSuperT)) 1506 continue; 1507 1508 if (FindInaccessibleBase(CanonicalSubT, CanonicalSuperT, Paths, true)) 1509 continue; 1510 1511 Contained = true; 1512 break; 1513 } 1514 if (!Contained) { 1515 Diag(SubLoc, DiagID); 1516 Diag(SuperLoc, NoteID); 1517 return true; 1518 } 1519 } 1520 // We've run the gauntlet. 1521 return false; 1522} 1523 1524/// ObjCGetTypeForMethodDefinition - Builds the type for a method definition 1525/// declarator 1526QualType Sema::ObjCGetTypeForMethodDefinition(DeclPtrTy D) { 1527 ObjCMethodDecl *MDecl = cast<ObjCMethodDecl>(D.getAs<Decl>()); 1528 QualType T = MDecl->getResultType(); 1529 llvm::SmallVector<QualType, 16> ArgTys; 1530 1531 // Add the first two invisible argument types for self and _cmd. 1532 if (MDecl->isInstanceMethod()) { 1533 QualType selfTy = Context.getObjCInterfaceType(MDecl->getClassInterface()); 1534 selfTy = Context.getPointerType(selfTy); 1535 ArgTys.push_back(selfTy); 1536 } else 1537 ArgTys.push_back(Context.getObjCIdType()); 1538 ArgTys.push_back(Context.getObjCSelType()); 1539 1540 for (ObjCMethodDecl::param_iterator PI = MDecl->param_begin(), 1541 E = MDecl->param_end(); PI != E; ++PI) { 1542 QualType ArgTy = (*PI)->getType(); 1543 assert(!ArgTy.isNull() && "Couldn't parse type?"); 1544 ArgTy = adjustParameterType(ArgTy); 1545 ArgTys.push_back(ArgTy); 1546 } 1547 T = Context.getFunctionType(T, &ArgTys[0], ArgTys.size(), 1548 MDecl->isVariadic(), 0); 1549 return T; 1550} 1551 1552/// UnwrapSimilarPointerTypes - If T1 and T2 are pointer types that 1553/// may be similar (C++ 4.4), replaces T1 and T2 with the type that 1554/// they point to and return true. If T1 and T2 aren't pointer types 1555/// or pointer-to-member types, or if they are not similar at this 1556/// level, returns false and leaves T1 and T2 unchanged. Top-level 1557/// qualifiers on T1 and T2 are ignored. This function will typically 1558/// be called in a loop that successively "unwraps" pointer and 1559/// pointer-to-member types to compare them at each level. 1560bool Sema::UnwrapSimilarPointerTypes(QualType& T1, QualType& T2) { 1561 const PointerType *T1PtrType = T1->getAs<PointerType>(), 1562 *T2PtrType = T2->getAs<PointerType>(); 1563 if (T1PtrType && T2PtrType) { 1564 T1 = T1PtrType->getPointeeType(); 1565 T2 = T2PtrType->getPointeeType(); 1566 return true; 1567 } 1568 1569 const MemberPointerType *T1MPType = T1->getAs<MemberPointerType>(), 1570 *T2MPType = T2->getAs<MemberPointerType>(); 1571 if (T1MPType && T2MPType && 1572 Context.getCanonicalType(T1MPType->getClass()) == 1573 Context.getCanonicalType(T2MPType->getClass())) { 1574 T1 = T1MPType->getPointeeType(); 1575 T2 = T2MPType->getPointeeType(); 1576 return true; 1577 } 1578 return false; 1579} 1580 1581Sema::TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 1582 // C99 6.7.6: Type names have no identifier. This is already validated by 1583 // the parser. 1584 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 1585 1586 DeclaratorInfo *DInfo = 0; 1587 TagDecl *OwnedTag = 0; 1588 QualType T = GetTypeForDeclarator(D, S, &DInfo, /*Skip=*/0, &OwnedTag); 1589 if (D.isInvalidType()) 1590 return true; 1591 1592 if (getLangOptions().CPlusPlus) { 1593 // Check that there are no default arguments (C++ only). 1594 CheckExtraCXXDefaultArguments(D); 1595 1596 // C++0x [dcl.type]p3: 1597 // A type-specifier-seq shall not define a class or enumeration 1598 // unless it appears in the type-id of an alias-declaration 1599 // (7.1.3). 1600 if (OwnedTag && OwnedTag->isDefinition()) 1601 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_type_specifier) 1602 << Context.getTypeDeclType(OwnedTag); 1603 } 1604 1605 if (DInfo) 1606 T = CreateLocInfoType(T, DInfo); 1607 1608 return T.getAsOpaquePtr(); 1609} 1610 1611 1612 1613//===----------------------------------------------------------------------===// 1614// Type Attribute Processing 1615//===----------------------------------------------------------------------===// 1616 1617/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 1618/// specified type. The attribute contains 1 argument, the id of the address 1619/// space for the type. 1620static void HandleAddressSpaceTypeAttribute(QualType &Type, 1621 const AttributeList &Attr, Sema &S){ 1622 // If this type is already address space qualified, reject it. 1623 // Clause 6.7.3 - Type qualifiers: "No type shall be qualified by qualifiers 1624 // for two or more different address spaces." 1625 if (Type.getAddressSpace()) { 1626 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 1627 return; 1628 } 1629 1630 // Check the attribute arguments. 1631 if (Attr.getNumArgs() != 1) { 1632 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1633 return; 1634 } 1635 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 1636 llvm::APSInt addrSpace(32); 1637 if (!ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 1638 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 1639 << ASArgExpr->getSourceRange(); 1640 return; 1641 } 1642 1643 // Bounds checking. 1644 if (addrSpace.isSigned()) { 1645 if (addrSpace.isNegative()) { 1646 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative) 1647 << ASArgExpr->getSourceRange(); 1648 return; 1649 } 1650 addrSpace.setIsSigned(false); 1651 } 1652 llvm::APSInt max(addrSpace.getBitWidth()); 1653 max = QualType::MaxAddressSpace; 1654 if (addrSpace > max) { 1655 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high) 1656 << QualType::MaxAddressSpace << ASArgExpr->getSourceRange(); 1657 return; 1658 } 1659 1660 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 1661 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 1662} 1663 1664/// HandleObjCGCTypeAttribute - Process an objc's gc attribute on the 1665/// specified type. The attribute contains 1 argument, weak or strong. 1666static void HandleObjCGCTypeAttribute(QualType &Type, 1667 const AttributeList &Attr, Sema &S) { 1668 if (Type.getObjCGCAttr() != QualType::GCNone) { 1669 S.Diag(Attr.getLoc(), diag::err_attribute_multiple_objc_gc); 1670 return; 1671 } 1672 1673 // Check the attribute arguments. 1674 if (!Attr.getParameterName()) { 1675 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) 1676 << "objc_gc" << 1; 1677 return; 1678 } 1679 QualType::GCAttrTypes GCAttr; 1680 if (Attr.getNumArgs() != 0) { 1681 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1682 return; 1683 } 1684 if (Attr.getParameterName()->isStr("weak")) 1685 GCAttr = QualType::Weak; 1686 else if (Attr.getParameterName()->isStr("strong")) 1687 GCAttr = QualType::Strong; 1688 else { 1689 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported) 1690 << "objc_gc" << Attr.getParameterName(); 1691 return; 1692 } 1693 1694 Type = S.Context.getObjCGCQualType(Type, GCAttr); 1695} 1696 1697/// HandleNoReturnTypeAttribute - Process the noreturn attribute on the 1698/// specified type. The attribute contains 0 arguments. 1699static void HandleNoReturnTypeAttribute(QualType &Type, 1700 const AttributeList &Attr, Sema &S) { 1701 if (Attr.getNumArgs() != 0) 1702 return; 1703 1704 // We only apply this to a pointer to function or a pointer to block. 1705 if (!Type->isFunctionPointerType() 1706 && !Type->isBlockPointerType() 1707 && !Type->isFunctionType()) 1708 return; 1709 1710 Type = S.Context.getNoReturnType(Type); 1711} 1712 1713void Sema::ProcessTypeAttributeList(QualType &Result, const AttributeList *AL) { 1714 // Scan through and apply attributes to this type where it makes sense. Some 1715 // attributes (such as __address_space__, __vector_size__, etc) apply to the 1716 // type, but others can be present in the type specifiers even though they 1717 // apply to the decl. Here we apply type attributes and ignore the rest. 1718 for (; AL; AL = AL->getNext()) { 1719 // If this is an attribute we can handle, do so now, otherwise, add it to 1720 // the LeftOverAttrs list for rechaining. 1721 switch (AL->getKind()) { 1722 default: break; 1723 case AttributeList::AT_address_space: 1724 HandleAddressSpaceTypeAttribute(Result, *AL, *this); 1725 break; 1726 case AttributeList::AT_objc_gc: 1727 HandleObjCGCTypeAttribute(Result, *AL, *this); 1728 break; 1729 case AttributeList::AT_noreturn: 1730 HandleNoReturnTypeAttribute(Result, *AL, *this); 1731 break; 1732 } 1733 } 1734} 1735 1736/// @brief Ensure that the type T is a complete type. 1737/// 1738/// This routine checks whether the type @p T is complete in any 1739/// context where a complete type is required. If @p T is a complete 1740/// type, returns false. If @p T is a class template specialization, 1741/// this routine then attempts to perform class template 1742/// instantiation. If instantiation fails, or if @p T is incomplete 1743/// and cannot be completed, issues the diagnostic @p diag (giving it 1744/// the type @p T) and returns true. 1745/// 1746/// @param Loc The location in the source that the incomplete type 1747/// diagnostic should refer to. 1748/// 1749/// @param T The type that this routine is examining for completeness. 1750/// 1751/// @param diag The diagnostic value (e.g., 1752/// @c diag::err_typecheck_decl_incomplete_type) that will be used 1753/// for the error message if @p T is incomplete. 1754/// 1755/// @param Range1 An optional range in the source code that will be a 1756/// part of the "incomplete type" error message. 1757/// 1758/// @param Range2 An optional range in the source code that will be a 1759/// part of the "incomplete type" error message. 1760/// 1761/// @param PrintType If non-NULL, the type that should be printed 1762/// instead of @p T. This parameter should be used when the type that 1763/// we're checking for incompleteness isn't the type that should be 1764/// displayed to the user, e.g., when T is a type and PrintType is a 1765/// pointer to T. 1766/// 1767/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 1768/// @c false otherwise. 1769bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, unsigned diag, 1770 SourceRange Range1, SourceRange Range2, 1771 QualType PrintType) { 1772 // FIXME: Add this assertion to help us flush out problems with 1773 // checking for dependent types and type-dependent expressions. 1774 // 1775 // assert(!T->isDependentType() && 1776 // "Can't ask whether a dependent type is complete"); 1777 1778 // If we have a complete type, we're done. 1779 if (!T->isIncompleteType()) 1780 return false; 1781 1782 // If we have a class template specialization or a class member of a 1783 // class template specialization, try to instantiate it. 1784 if (const RecordType *Record = T->getAs<RecordType>()) { 1785 if (ClassTemplateSpecializationDecl *ClassTemplateSpec 1786 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { 1787 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) { 1788 // Update the class template specialization's location to 1789 // refer to the point of instantiation. 1790 if (Loc.isValid()) 1791 ClassTemplateSpec->setLocation(Loc); 1792 return InstantiateClassTemplateSpecialization(ClassTemplateSpec, 1793 /*ExplicitInstantiation=*/false); 1794 } 1795 } else if (CXXRecordDecl *Rec 1796 = dyn_cast<CXXRecordDecl>(Record->getDecl())) { 1797 if (CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass()) { 1798 // Find the class template specialization that surrounds this 1799 // member class. 1800 ClassTemplateSpecializationDecl *Spec = 0; 1801 for (DeclContext *Parent = Rec->getDeclContext(); 1802 Parent && !Spec; Parent = Parent->getParent()) 1803 Spec = dyn_cast<ClassTemplateSpecializationDecl>(Parent); 1804 assert(Spec && "Not a member of a class template specialization?"); 1805 return InstantiateClass(Loc, Rec, Pattern, Spec->getTemplateArgs(), 1806 /*ExplicitInstantiation=*/false); 1807 } 1808 } 1809 } 1810 1811 if (PrintType.isNull()) 1812 PrintType = T; 1813 1814 // We have an incomplete type. Produce a diagnostic. 1815 Diag(Loc, diag) << PrintType << Range1 << Range2; 1816 1817 // If the type was a forward declaration of a class/struct/union 1818 // type, produce 1819 const TagType *Tag = 0; 1820 if (const RecordType *Record = T->getAs<RecordType>()) 1821 Tag = Record; 1822 else if (const EnumType *Enum = T->getAsEnumType()) 1823 Tag = Enum; 1824 1825 if (Tag && !Tag->getDecl()->isInvalidDecl()) 1826 Diag(Tag->getDecl()->getLocation(), 1827 Tag->isBeingDefined() ? diag::note_type_being_defined 1828 : diag::note_forward_declaration) 1829 << QualType(Tag, 0); 1830 1831 return true; 1832} 1833 1834/// \brief Retrieve a version of the type 'T' that is qualified by the 1835/// nested-name-specifier contained in SS. 1836QualType Sema::getQualifiedNameType(const CXXScopeSpec &SS, QualType T) { 1837 if (!SS.isSet() || SS.isInvalid() || T.isNull()) 1838 return T; 1839 1840 NestedNameSpecifier *NNS 1841 = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 1842 return Context.getQualifiedNameType(NNS, T); 1843} 1844 1845QualType Sema::BuildTypeofExprType(Expr *E) { 1846 return Context.getTypeOfExprType(E); 1847} 1848 1849QualType Sema::BuildDecltypeType(Expr *E) { 1850 if (E->getType() == Context.OverloadTy) { 1851 Diag(E->getLocStart(), 1852 diag::err_cannot_determine_declared_type_of_overloaded_function); 1853 return QualType(); 1854 } 1855 return Context.getDecltypeType(E); 1856} 1857