SemaType.cpp revision b78d833b12f7c4baab138f305f72efd49455a3f9
1//===--- SemaType.cpp - Semantic Analysis for Types -----------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements type-related semantic analysis. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "clang/AST/ASTContext.h" 16#include "clang/AST/DeclObjC.h" 17#include "clang/AST/DeclTemplate.h" 18#include "clang/AST/Expr.h" 19#include "clang/Parse/DeclSpec.h" 20using namespace clang; 21 22/// \brief Perform adjustment on the parameter type of a function. 23/// 24/// This routine adjusts the given parameter type @p T to the actual 25/// parameter type used by semantic analysis (C99 6.7.5.3p[7,8], 26/// C++ [dcl.fct]p3). The adjusted parameter type is returned. 27QualType Sema::adjustParameterType(QualType T) { 28 // C99 6.7.5.3p7: 29 if (T->isArrayType()) { 30 // C99 6.7.5.3p7: 31 // A declaration of a parameter as "array of type" shall be 32 // adjusted to "qualified pointer to type", where the type 33 // qualifiers (if any) are those specified within the [ and ] of 34 // the array type derivation. 35 return Context.getArrayDecayedType(T); 36 } else if (T->isFunctionType()) 37 // C99 6.7.5.3p8: 38 // A declaration of a parameter as "function returning type" 39 // shall be adjusted to "pointer to function returning type", as 40 // in 6.3.2.1. 41 return Context.getPointerType(T); 42 43 return T; 44} 45 46/// \brief Convert the specified declspec to the appropriate type 47/// object. 48/// \param DS the declaration specifiers 49/// \param DeclLoc The location of the declarator identifier or invalid if none. 50/// \returns The type described by the declaration specifiers. This function 51/// never returns null. 52QualType Sema::ConvertDeclSpecToType(const DeclSpec &DS, 53 SourceLocation DeclLoc, 54 bool &isInvalid) { 55 // FIXME: Should move the logic from DeclSpec::Finish to here for validity 56 // checking. 57 QualType Result; 58 59 switch (DS.getTypeSpecType()) { 60 case DeclSpec::TST_void: 61 Result = Context.VoidTy; 62 break; 63 case DeclSpec::TST_char: 64 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 65 Result = Context.CharTy; 66 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) 67 Result = Context.SignedCharTy; 68 else { 69 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 70 "Unknown TSS value"); 71 Result = Context.UnsignedCharTy; 72 } 73 break; 74 case DeclSpec::TST_wchar: 75 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 76 Result = Context.WCharTy; 77 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) { 78 Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 79 << DS.getSpecifierName(DS.getTypeSpecType()); 80 Result = Context.getSignedWCharType(); 81 } else { 82 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 83 "Unknown TSS value"); 84 Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 85 << DS.getSpecifierName(DS.getTypeSpecType()); 86 Result = Context.getUnsignedWCharType(); 87 } 88 break; 89 case DeclSpec::TST_unspecified: 90 // "<proto1,proto2>" is an objc qualified ID with a missing id. 91 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 92 Result = Context.getObjCQualifiedIdType((ObjCProtocolDecl**)PQ, 93 DS.getNumProtocolQualifiers()); 94 break; 95 } 96 97 // Unspecified typespec defaults to int in C90. However, the C90 grammar 98 // [C90 6.5] only allows a decl-spec if there was *some* type-specifier, 99 // type-qualifier, or storage-class-specifier. If not, emit an extwarn. 100 // Note that the one exception to this is function definitions, which are 101 // allowed to be completely missing a declspec. This is handled in the 102 // parser already though by it pretending to have seen an 'int' in this 103 // case. 104 if (getLangOptions().ImplicitInt) { 105 // In C89 mode, we only warn if there is a completely missing declspec 106 // when one is not allowed. 107 if (DS.isEmpty()) { 108 if (DeclLoc.isInvalid()) 109 DeclLoc = DS.getSourceRange().getBegin(); 110 Diag(DeclLoc, diag::ext_missing_declspec) 111 << DS.getSourceRange() 112 << CodeModificationHint::CreateInsertion(DS.getSourceRange().getBegin(), 113 "int"); 114 } 115 } else if (!DS.hasTypeSpecifier()) { 116 // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says: 117 // "At least one type specifier shall be given in the declaration 118 // specifiers in each declaration, and in the specifier-qualifier list in 119 // each struct declaration and type name." 120 // FIXME: Does Microsoft really have the implicit int extension in C++? 121 if (DeclLoc.isInvalid()) 122 DeclLoc = DS.getSourceRange().getBegin(); 123 124 if (getLangOptions().CPlusPlus && !getLangOptions().Microsoft) { 125 Diag(DeclLoc, diag::err_missing_type_specifier) 126 << DS.getSourceRange(); 127 128 // When this occurs in C++ code, often something is very broken with the 129 // value being declared, poison it as invalid so we don't get chains of 130 // errors. 131 isInvalid = true; 132 } else { 133 Diag(DeclLoc, diag::ext_missing_type_specifier) 134 << DS.getSourceRange(); 135 } 136 } 137 138 // FALL THROUGH. 139 case DeclSpec::TST_int: { 140 if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) { 141 switch (DS.getTypeSpecWidth()) { 142 case DeclSpec::TSW_unspecified: Result = Context.IntTy; break; 143 case DeclSpec::TSW_short: Result = Context.ShortTy; break; 144 case DeclSpec::TSW_long: Result = Context.LongTy; break; 145 case DeclSpec::TSW_longlong: Result = Context.LongLongTy; break; 146 } 147 } else { 148 switch (DS.getTypeSpecWidth()) { 149 case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break; 150 case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break; 151 case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break; 152 case DeclSpec::TSW_longlong: Result =Context.UnsignedLongLongTy; break; 153 } 154 } 155 break; 156 } 157 case DeclSpec::TST_float: Result = Context.FloatTy; break; 158 case DeclSpec::TST_double: 159 if (DS.getTypeSpecWidth() == DeclSpec::TSW_long) 160 Result = Context.LongDoubleTy; 161 else 162 Result = Context.DoubleTy; 163 break; 164 case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool 165 case DeclSpec::TST_decimal32: // _Decimal32 166 case DeclSpec::TST_decimal64: // _Decimal64 167 case DeclSpec::TST_decimal128: // _Decimal128 168 Diag(DS.getTypeSpecTypeLoc(), diag::err_decimal_unsupported); 169 Result = Context.IntTy; 170 isInvalid = true; 171 break; 172 case DeclSpec::TST_class: 173 case DeclSpec::TST_enum: 174 case DeclSpec::TST_union: 175 case DeclSpec::TST_struct: { 176 Decl *D = static_cast<Decl *>(DS.getTypeRep()); 177 assert(D && "Didn't get a decl for a class/enum/union/struct?"); 178 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 179 DS.getTypeSpecSign() == 0 && 180 "Can't handle qualifiers on typedef names yet!"); 181 // TypeQuals handled by caller. 182 Result = Context.getTypeDeclType(cast<TypeDecl>(D)); 183 184 if (D->isInvalidDecl()) 185 isInvalid = true; 186 break; 187 } 188 case DeclSpec::TST_typename: { 189 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 190 DS.getTypeSpecSign() == 0 && 191 "Can't handle qualifiers on typedef names yet!"); 192 Result = QualType::getFromOpaquePtr(DS.getTypeRep()); 193 194 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 195 // FIXME: Adding a TST_objcInterface clause doesn't seem ideal, so we have 196 // this "hack" for now... 197 if (const ObjCInterfaceType *Interface = Result->getAsObjCInterfaceType()) 198 Result = Context.getObjCQualifiedInterfaceType(Interface->getDecl(), 199 (ObjCProtocolDecl**)PQ, 200 DS.getNumProtocolQualifiers()); 201 else if (Result == Context.getObjCIdType()) 202 // id<protocol-list> 203 Result = Context.getObjCQualifiedIdType((ObjCProtocolDecl**)PQ, 204 DS.getNumProtocolQualifiers()); 205 else if (Result == Context.getObjCClassType()) { 206 if (DeclLoc.isInvalid()) 207 DeclLoc = DS.getSourceRange().getBegin(); 208 // Class<protocol-list> 209 Diag(DeclLoc, diag::err_qualified_class_unsupported) 210 << DS.getSourceRange(); 211 } else { 212 if (DeclLoc.isInvalid()) 213 DeclLoc = DS.getSourceRange().getBegin(); 214 Diag(DeclLoc, diag::err_invalid_protocol_qualifiers) 215 << DS.getSourceRange(); 216 isInvalid = true; 217 } 218 } 219 220 // If this is a reference to an invalid typedef, propagate the invalidity. 221 if (TypedefType *TDT = dyn_cast<TypedefType>(Result)) 222 if (TDT->getDecl()->isInvalidDecl()) 223 isInvalid = true; 224 225 // TypeQuals handled by caller. 226 break; 227 } 228 case DeclSpec::TST_typeofType: 229 Result = QualType::getFromOpaquePtr(DS.getTypeRep()); 230 assert(!Result.isNull() && "Didn't get a type for typeof?"); 231 // TypeQuals handled by caller. 232 Result = Context.getTypeOfType(Result); 233 break; 234 case DeclSpec::TST_typeofExpr: { 235 Expr *E = static_cast<Expr *>(DS.getTypeRep()); 236 assert(E && "Didn't get an expression for typeof?"); 237 // TypeQuals handled by caller. 238 Result = Context.getTypeOfExprType(E); 239 break; 240 } 241 case DeclSpec::TST_decltype: { 242 Expr *E = static_cast<Expr *>(DS.getTypeRep()); 243 assert(E && "Didn't get an expression for decltype?"); 244 // TypeQuals handled by caller. 245 Result = Context.getDecltypeType(E); 246 break; 247 } 248 249 case DeclSpec::TST_error: 250 Result = Context.IntTy; 251 isInvalid = true; 252 break; 253 } 254 255 // Handle complex types. 256 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) { 257 if (getLangOptions().Freestanding) 258 Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex); 259 Result = Context.getComplexType(Result); 260 } 261 262 assert(DS.getTypeSpecComplex() != DeclSpec::TSC_imaginary && 263 "FIXME: imaginary types not supported yet!"); 264 265 // See if there are any attributes on the declspec that apply to the type (as 266 // opposed to the decl). 267 if (const AttributeList *AL = DS.getAttributes()) 268 ProcessTypeAttributeList(Result, AL); 269 270 // Apply const/volatile/restrict qualifiers to T. 271 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 272 273 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 274 // or incomplete types shall not be restrict-qualified." C++ also allows 275 // restrict-qualified references. 276 if (TypeQuals & QualType::Restrict) { 277 if (Result->isPointerType() || Result->isReferenceType()) { 278 QualType EltTy = Result->isPointerType() ? 279 Result->getAsPointerType()->getPointeeType() : 280 Result->getAsReferenceType()->getPointeeType(); 281 282 // If we have a pointer or reference, the pointee must have an object 283 // incomplete type. 284 if (!EltTy->isIncompleteOrObjectType()) { 285 Diag(DS.getRestrictSpecLoc(), 286 diag::err_typecheck_invalid_restrict_invalid_pointee) 287 << EltTy << DS.getSourceRange(); 288 TypeQuals &= ~QualType::Restrict; // Remove the restrict qualifier. 289 } 290 } else { 291 Diag(DS.getRestrictSpecLoc(), 292 diag::err_typecheck_invalid_restrict_not_pointer) 293 << Result << DS.getSourceRange(); 294 TypeQuals &= ~QualType::Restrict; // Remove the restrict qualifier. 295 } 296 } 297 298 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification 299 // of a function type includes any type qualifiers, the behavior is 300 // undefined." 301 if (Result->isFunctionType() && TypeQuals) { 302 // Get some location to point at, either the C or V location. 303 SourceLocation Loc; 304 if (TypeQuals & QualType::Const) 305 Loc = DS.getConstSpecLoc(); 306 else { 307 assert((TypeQuals & QualType::Volatile) && 308 "Has CV quals but not C or V?"); 309 Loc = DS.getVolatileSpecLoc(); 310 } 311 Diag(Loc, diag::warn_typecheck_function_qualifiers) 312 << Result << DS.getSourceRange(); 313 } 314 315 // C++ [dcl.ref]p1: 316 // Cv-qualified references are ill-formed except when the 317 // cv-qualifiers are introduced through the use of a typedef 318 // (7.1.3) or of a template type argument (14.3), in which 319 // case the cv-qualifiers are ignored. 320 // FIXME: Shouldn't we be checking SCS_typedef here? 321 if (DS.getTypeSpecType() == DeclSpec::TST_typename && 322 TypeQuals && Result->isReferenceType()) { 323 TypeQuals &= ~QualType::Const; 324 TypeQuals &= ~QualType::Volatile; 325 } 326 327 Result = Result.getQualifiedType(TypeQuals); 328 } 329 return Result; 330} 331 332static std::string getPrintableNameForEntity(DeclarationName Entity) { 333 if (Entity) 334 return Entity.getAsString(); 335 336 return "type name"; 337} 338 339/// \brief Build a pointer type. 340/// 341/// \param T The type to which we'll be building a pointer. 342/// 343/// \param Quals The cvr-qualifiers to be applied to the pointer type. 344/// 345/// \param Loc The location of the entity whose type involves this 346/// pointer type or, if there is no such entity, the location of the 347/// type that will have pointer type. 348/// 349/// \param Entity The name of the entity that involves the pointer 350/// type, if known. 351/// 352/// \returns A suitable pointer type, if there are no 353/// errors. Otherwise, returns a NULL type. 354QualType Sema::BuildPointerType(QualType T, unsigned Quals, 355 SourceLocation Loc, DeclarationName Entity) { 356 if (T->isReferenceType()) { 357 // C++ 8.3.2p4: There shall be no ... pointers to references ... 358 Diag(Loc, diag::err_illegal_decl_pointer_to_reference) 359 << getPrintableNameForEntity(Entity); 360 return QualType(); 361 } 362 363 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 364 // object or incomplete types shall not be restrict-qualified." 365 if ((Quals & QualType::Restrict) && !T->isIncompleteOrObjectType()) { 366 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 367 << T; 368 Quals &= ~QualType::Restrict; 369 } 370 371 // Build the pointer type. 372 return Context.getPointerType(T).getQualifiedType(Quals); 373} 374 375/// \brief Build a reference type. 376/// 377/// \param T The type to which we'll be building a reference. 378/// 379/// \param Quals The cvr-qualifiers to be applied to the reference type. 380/// 381/// \param Loc The location of the entity whose type involves this 382/// reference type or, if there is no such entity, the location of the 383/// type that will have reference type. 384/// 385/// \param Entity The name of the entity that involves the reference 386/// type, if known. 387/// 388/// \returns A suitable reference type, if there are no 389/// errors. Otherwise, returns a NULL type. 390QualType Sema::BuildReferenceType(QualType T, bool LValueRef, unsigned Quals, 391 SourceLocation Loc, DeclarationName Entity) { 392 if (LValueRef) { 393 if (const RValueReferenceType *R = T->getAsRValueReferenceType()) { 394 // C++0x [dcl.typedef]p9: If a typedef TD names a type that is a 395 // reference to a type T, and attempt to create the type "lvalue 396 // reference to cv TD" creates the type "lvalue reference to T". 397 // We use the qualifiers (restrict or none) of the original reference, 398 // not the new ones. This is consistent with GCC. 399 return Context.getLValueReferenceType(R->getPointeeType()). 400 getQualifiedType(T.getCVRQualifiers()); 401 } 402 } 403 if (T->isReferenceType()) { 404 // C++ [dcl.ref]p4: There shall be no references to references. 405 // 406 // According to C++ DR 106, references to references are only 407 // diagnosed when they are written directly (e.g., "int & &"), 408 // but not when they happen via a typedef: 409 // 410 // typedef int& intref; 411 // typedef intref& intref2; 412 // 413 // Parser::ParserDeclaratorInternal diagnoses the case where 414 // references are written directly; here, we handle the 415 // collapsing of references-to-references as described in C++ 416 // DR 106 and amended by C++ DR 540. 417 return T; 418 } 419 420 // C++ [dcl.ref]p1: 421 // A declarator that specifies the type “reference to cv void” 422 // is ill-formed. 423 if (T->isVoidType()) { 424 Diag(Loc, diag::err_reference_to_void); 425 return QualType(); 426 } 427 428 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 429 // object or incomplete types shall not be restrict-qualified." 430 if ((Quals & QualType::Restrict) && !T->isIncompleteOrObjectType()) { 431 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 432 << T; 433 Quals &= ~QualType::Restrict; 434 } 435 436 // C++ [dcl.ref]p1: 437 // [...] Cv-qualified references are ill-formed except when the 438 // cv-qualifiers are introduced through the use of a typedef 439 // (7.1.3) or of a template type argument (14.3), in which case 440 // the cv-qualifiers are ignored. 441 // 442 // We diagnose extraneous cv-qualifiers for the non-typedef, 443 // non-template type argument case within the parser. Here, we just 444 // ignore any extraneous cv-qualifiers. 445 Quals &= ~QualType::Const; 446 Quals &= ~QualType::Volatile; 447 448 // Handle restrict on references. 449 if (LValueRef) 450 return Context.getLValueReferenceType(T).getQualifiedType(Quals); 451 return Context.getRValueReferenceType(T).getQualifiedType(Quals); 452} 453 454/// \brief Build an array type. 455/// 456/// \param T The type of each element in the array. 457/// 458/// \param ASM C99 array size modifier (e.g., '*', 'static'). 459/// 460/// \param ArraySize Expression describing the size of the array. 461/// 462/// \param Quals The cvr-qualifiers to be applied to the array's 463/// element type. 464/// 465/// \param Loc The location of the entity whose type involves this 466/// array type or, if there is no such entity, the location of the 467/// type that will have array type. 468/// 469/// \param Entity The name of the entity that involves the array 470/// type, if known. 471/// 472/// \returns A suitable array type, if there are no errors. Otherwise, 473/// returns a NULL type. 474QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM, 475 Expr *ArraySize, unsigned Quals, 476 SourceLocation Loc, DeclarationName Entity) { 477 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 478 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 479 if (RequireCompleteType(Loc, T, 480 diag::err_illegal_decl_array_incomplete_type)) 481 return QualType(); 482 483 if (T->isFunctionType()) { 484 Diag(Loc, diag::err_illegal_decl_array_of_functions) 485 << getPrintableNameForEntity(Entity); 486 return QualType(); 487 } 488 489 // C++ 8.3.2p4: There shall be no ... arrays of references ... 490 if (T->isReferenceType()) { 491 Diag(Loc, diag::err_illegal_decl_array_of_references) 492 << getPrintableNameForEntity(Entity); 493 return QualType(); 494 } 495 496 if (const RecordType *EltTy = T->getAsRecordType()) { 497 // If the element type is a struct or union that contains a variadic 498 // array, accept it as a GNU extension: C99 6.7.2.1p2. 499 if (EltTy->getDecl()->hasFlexibleArrayMember()) 500 Diag(Loc, diag::ext_flexible_array_in_array) << T; 501 } else if (T->isObjCInterfaceType()) { 502 Diag(Loc, diag::err_objc_array_of_interfaces) << T; 503 return QualType(); 504 } 505 506 // C99 6.7.5.2p1: The size expression shall have integer type. 507 if (ArraySize && !ArraySize->isTypeDependent() && 508 !ArraySize->getType()->isIntegerType()) { 509 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 510 << ArraySize->getType() << ArraySize->getSourceRange(); 511 ArraySize->Destroy(Context); 512 return QualType(); 513 } 514 llvm::APSInt ConstVal(32); 515 if (!ArraySize) { 516 if (ASM == ArrayType::Star) 517 T = Context.getVariableArrayType(T, 0, ASM, Quals); 518 else 519 T = Context.getIncompleteArrayType(T, ASM, Quals); 520 } else if (ArraySize->isValueDependent()) { 521 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals); 522 } else if (!ArraySize->isIntegerConstantExpr(ConstVal, Context) || 523 (!T->isDependentType() && !T->isConstantSizeType())) { 524 // Per C99, a variable array is an array with either a non-constant 525 // size or an element type that has a non-constant-size 526 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals); 527 } else { 528 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 529 // have a value greater than zero. 530 if (ConstVal.isSigned()) { 531 if (ConstVal.isNegative()) { 532 Diag(ArraySize->getLocStart(), 533 diag::err_typecheck_negative_array_size) 534 << ArraySize->getSourceRange(); 535 return QualType(); 536 } else if (ConstVal == 0) { 537 // GCC accepts zero sized static arrays. 538 Diag(ArraySize->getLocStart(), diag::ext_typecheck_zero_array_size) 539 << ArraySize->getSourceRange(); 540 } 541 } 542 T = Context.getConstantArrayType(T, ConstVal, ASM, Quals); 543 } 544 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 545 if (!getLangOptions().C99) { 546 if (ArraySize && !ArraySize->isTypeDependent() && 547 !ArraySize->isValueDependent() && 548 !ArraySize->isIntegerConstantExpr(Context)) 549 Diag(Loc, diag::ext_vla); 550 else if (ASM != ArrayType::Normal || Quals != 0) 551 Diag(Loc, diag::ext_c99_array_usage); 552 } 553 554 return T; 555} 556 557/// \brief Build an ext-vector type. 558/// 559/// Run the required checks for the extended vector type. 560QualType Sema::BuildExtVectorType(QualType T, ExprArg ArraySize, 561 SourceLocation AttrLoc) { 562 563 Expr *Arg = (Expr *)ArraySize.get(); 564 565 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 566 // in conjunction with complex types (pointers, arrays, functions, etc.). 567 if (!T->isDependentType() && 568 !T->isIntegerType() && !T->isRealFloatingType()) { 569 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T; 570 return QualType(); 571 } 572 573 if (!Arg->isTypeDependent() && !Arg->isValueDependent()) { 574 llvm::APSInt vecSize(32); 575 if (!Arg->isIntegerConstantExpr(vecSize, Context)) { 576 Diag(AttrLoc, diag::err_attribute_argument_not_int) 577 << "ext_vector_type" << Arg->getSourceRange(); 578 return QualType(); 579 } 580 581 // unlike gcc's vector_size attribute, the size is specified as the 582 // number of elements, not the number of bytes. 583 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 584 585 if (vectorSize == 0) { 586 Diag(AttrLoc, diag::err_attribute_zero_size) 587 << Arg->getSourceRange(); 588 return QualType(); 589 } 590 591 if (!T->isDependentType()) 592 return Context.getExtVectorType(T, vectorSize); 593 } 594 595 return Context.getDependentSizedExtVectorType(T, ArraySize.takeAs<Expr>(), 596 AttrLoc); 597} 598 599/// \brief Build a function type. 600/// 601/// This routine checks the function type according to C++ rules and 602/// under the assumption that the result type and parameter types have 603/// just been instantiated from a template. It therefore duplicates 604/// some of the behavior of GetTypeForDeclarator, but in a much 605/// simpler form that is only suitable for this narrow use case. 606/// 607/// \param T The return type of the function. 608/// 609/// \param ParamTypes The parameter types of the function. This array 610/// will be modified to account for adjustments to the types of the 611/// function parameters. 612/// 613/// \param NumParamTypes The number of parameter types in ParamTypes. 614/// 615/// \param Variadic Whether this is a variadic function type. 616/// 617/// \param Quals The cvr-qualifiers to be applied to the function type. 618/// 619/// \param Loc The location of the entity whose type involves this 620/// function type or, if there is no such entity, the location of the 621/// type that will have function type. 622/// 623/// \param Entity The name of the entity that involves the function 624/// type, if known. 625/// 626/// \returns A suitable function type, if there are no 627/// errors. Otherwise, returns a NULL type. 628QualType Sema::BuildFunctionType(QualType T, 629 QualType *ParamTypes, 630 unsigned NumParamTypes, 631 bool Variadic, unsigned Quals, 632 SourceLocation Loc, DeclarationName Entity) { 633 if (T->isArrayType() || T->isFunctionType()) { 634 Diag(Loc, diag::err_func_returning_array_function) << T; 635 return QualType(); 636 } 637 638 bool Invalid = false; 639 for (unsigned Idx = 0; Idx < NumParamTypes; ++Idx) { 640 QualType ParamType = adjustParameterType(ParamTypes[Idx]); 641 if (ParamType->isVoidType()) { 642 Diag(Loc, diag::err_param_with_void_type); 643 Invalid = true; 644 } 645 646 ParamTypes[Idx] = ParamType; 647 } 648 649 if (Invalid) 650 return QualType(); 651 652 return Context.getFunctionType(T, ParamTypes, NumParamTypes, Variadic, 653 Quals); 654} 655 656/// \brief Build a member pointer type \c T Class::*. 657/// 658/// \param T the type to which the member pointer refers. 659/// \param Class the class type into which the member pointer points. 660/// \param Quals Qualifiers applied to the member pointer type 661/// \param Loc the location where this type begins 662/// \param Entity the name of the entity that will have this member pointer type 663/// 664/// \returns a member pointer type, if successful, or a NULL type if there was 665/// an error. 666QualType Sema::BuildMemberPointerType(QualType T, QualType Class, 667 unsigned Quals, SourceLocation Loc, 668 DeclarationName Entity) { 669 // Verify that we're not building a pointer to pointer to function with 670 // exception specification. 671 if (CheckDistantExceptionSpec(T)) { 672 Diag(Loc, diag::err_distant_exception_spec); 673 674 // FIXME: If we're doing this as part of template instantiation, 675 // we should return immediately. 676 677 // Build the type anyway, but use the canonical type so that the 678 // exception specifiers are stripped off. 679 T = Context.getCanonicalType(T); 680 } 681 682 // C++ 8.3.3p3: A pointer to member shall not pointer to ... a member 683 // with reference type, or "cv void." 684 if (T->isReferenceType()) { 685 Diag(Loc, diag::err_illegal_decl_pointer_to_reference) 686 << (Entity? Entity.getAsString() : "type name"); 687 return QualType(); 688 } 689 690 if (T->isVoidType()) { 691 Diag(Loc, diag::err_illegal_decl_mempointer_to_void) 692 << (Entity? Entity.getAsString() : "type name"); 693 return QualType(); 694 } 695 696 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 697 // object or incomplete types shall not be restrict-qualified." 698 if ((Quals & QualType::Restrict) && !T->isIncompleteOrObjectType()) { 699 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 700 << T; 701 702 // FIXME: If we're doing this as part of template instantiation, 703 // we should return immediately. 704 Quals &= ~QualType::Restrict; 705 } 706 707 if (!Class->isDependentType() && !Class->isRecordType()) { 708 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class; 709 return QualType(); 710 } 711 712 return Context.getMemberPointerType(T, Class.getTypePtr()) 713 .getQualifiedType(Quals); 714} 715 716/// \brief Build a block pointer type. 717/// 718/// \param T The type to which we'll be building a block pointer. 719/// 720/// \param Quals The cvr-qualifiers to be applied to the block pointer type. 721/// 722/// \param Loc The location of the entity whose type involves this 723/// block pointer type or, if there is no such entity, the location of the 724/// type that will have block pointer type. 725/// 726/// \param Entity The name of the entity that involves the block pointer 727/// type, if known. 728/// 729/// \returns A suitable block pointer type, if there are no 730/// errors. Otherwise, returns a NULL type. 731QualType Sema::BuildBlockPointerType(QualType T, unsigned Quals, 732 SourceLocation Loc, 733 DeclarationName Entity) { 734 if (!T.getTypePtr()->isFunctionType()) { 735 Diag(Loc, diag::err_nonfunction_block_type); 736 return QualType(); 737 } 738 739 return Context.getBlockPointerType(T).getQualifiedType(Quals); 740} 741 742/// GetTypeForDeclarator - Convert the type for the specified 743/// declarator to Type instances. Skip the outermost Skip type 744/// objects. 745/// 746/// If OwnedDecl is non-NULL, and this declarator's decl-specifier-seq 747/// owns the declaration of a type (e.g., the definition of a struct 748/// type), then *OwnedDecl will receive the owned declaration. 749QualType Sema::GetTypeForDeclarator(Declarator &D, Scope *S, unsigned Skip, 750 TagDecl **OwnedDecl) { 751 bool OmittedReturnType = false; 752 753 if (D.getContext() == Declarator::BlockLiteralContext 754 && Skip == 0 755 && !D.getDeclSpec().hasTypeSpecifier() 756 && (D.getNumTypeObjects() == 0 757 || (D.getNumTypeObjects() == 1 758 && D.getTypeObject(0).Kind == DeclaratorChunk::Function))) 759 OmittedReturnType = true; 760 761 // long long is a C99 feature. 762 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 763 D.getDeclSpec().getTypeSpecWidth() == DeclSpec::TSW_longlong) 764 Diag(D.getDeclSpec().getTypeSpecWidthLoc(), diag::ext_longlong); 765 766 // Determine the type of the declarator. Not all forms of declarator 767 // have a type. 768 QualType T; 769 switch (D.getKind()) { 770 case Declarator::DK_Abstract: 771 case Declarator::DK_Normal: 772 case Declarator::DK_Operator: { 773 const DeclSpec &DS = D.getDeclSpec(); 774 if (OmittedReturnType) { 775 // We default to a dependent type initially. Can be modified by 776 // the first return statement. 777 T = Context.DependentTy; 778 } else { 779 bool isInvalid = false; 780 T = ConvertDeclSpecToType(DS, D.getIdentifierLoc(), isInvalid); 781 if (isInvalid) 782 D.setInvalidType(true); 783 else if (OwnedDecl && DS.isTypeSpecOwned()) 784 *OwnedDecl = cast<TagDecl>((Decl *)DS.getTypeRep()); 785 } 786 break; 787 } 788 789 case Declarator::DK_Constructor: 790 case Declarator::DK_Destructor: 791 case Declarator::DK_Conversion: 792 // Constructors and destructors don't have return types. Use 793 // "void" instead. Conversion operators will check their return 794 // types separately. 795 T = Context.VoidTy; 796 break; 797 } 798 799 // The name we're declaring, if any. 800 DeclarationName Name; 801 if (D.getIdentifier()) 802 Name = D.getIdentifier(); 803 804 // Walk the DeclTypeInfo, building the recursive type as we go. 805 // DeclTypeInfos are ordered from the identifier out, which is 806 // opposite of what we want :). 807 for (unsigned i = Skip, e = D.getNumTypeObjects(); i != e; ++i) { 808 DeclaratorChunk &DeclType = D.getTypeObject(e-i-1+Skip); 809 switch (DeclType.Kind) { 810 default: assert(0 && "Unknown decltype!"); 811 case DeclaratorChunk::BlockPointer: 812 // If blocks are disabled, emit an error. 813 if (!LangOpts.Blocks) 814 Diag(DeclType.Loc, diag::err_blocks_disable); 815 816 T = BuildBlockPointerType(T, DeclType.Cls.TypeQuals, D.getIdentifierLoc(), 817 Name); 818 break; 819 case DeclaratorChunk::Pointer: 820 // Verify that we're not building a pointer to pointer to function with 821 // exception specification. 822 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 823 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 824 D.setInvalidType(true); 825 // Build the type anyway. 826 } 827 T = BuildPointerType(T, DeclType.Ptr.TypeQuals, DeclType.Loc, Name); 828 break; 829 case DeclaratorChunk::Reference: 830 // Verify that we're not building a reference to pointer to function with 831 // exception specification. 832 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 833 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 834 D.setInvalidType(true); 835 // Build the type anyway. 836 } 837 T = BuildReferenceType(T, DeclType.Ref.LValueRef, 838 DeclType.Ref.HasRestrict ? QualType::Restrict : 0, 839 DeclType.Loc, Name); 840 break; 841 case DeclaratorChunk::Array: { 842 // Verify that we're not building an array of pointers to function with 843 // exception specification. 844 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 845 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 846 D.setInvalidType(true); 847 // Build the type anyway. 848 } 849 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 850 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 851 ArrayType::ArraySizeModifier ASM; 852 if (ATI.isStar) 853 ASM = ArrayType::Star; 854 else if (ATI.hasStatic) 855 ASM = ArrayType::Static; 856 else 857 ASM = ArrayType::Normal; 858 if (ASM == ArrayType::Star && 859 D.getContext() != Declarator::PrototypeContext) { 860 // FIXME: This check isn't quite right: it allows star in prototypes 861 // for function definitions, and disallows some edge cases detailed 862 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html 863 Diag(DeclType.Loc, diag::err_array_star_outside_prototype); 864 ASM = ArrayType::Normal; 865 D.setInvalidType(true); 866 } 867 T = BuildArrayType(T, ASM, ArraySize, ATI.TypeQuals, DeclType.Loc, Name); 868 break; 869 } 870 case DeclaratorChunk::Function: { 871 // If the function declarator has a prototype (i.e. it is not () and 872 // does not have a K&R-style identifier list), then the arguments are part 873 // of the type, otherwise the argument list is (). 874 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 875 876 // C99 6.7.5.3p1: The return type may not be a function or array type. 877 if (T->isArrayType() || T->isFunctionType()) { 878 Diag(DeclType.Loc, diag::err_func_returning_array_function) << T; 879 T = Context.IntTy; 880 D.setInvalidType(true); 881 } 882 883 if (getLangOptions().CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) { 884 // C++ [dcl.fct]p6: 885 // Types shall not be defined in return or parameter types. 886 TagDecl *Tag = cast<TagDecl>((Decl *)D.getDeclSpec().getTypeRep()); 887 if (Tag->isDefinition()) 888 Diag(Tag->getLocation(), diag::err_type_defined_in_result_type) 889 << Context.getTypeDeclType(Tag); 890 } 891 892 // Exception specs are not allowed in typedefs. Complain, but add it 893 // anyway. 894 if (FTI.hasExceptionSpec && 895 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 896 Diag(FTI.getThrowLoc(), diag::err_exception_spec_in_typedef); 897 898 if (FTI.NumArgs == 0) { 899 if (getLangOptions().CPlusPlus) { 900 // C++ 8.3.5p2: If the parameter-declaration-clause is empty, the 901 // function takes no arguments. 902 llvm::SmallVector<QualType, 4> Exceptions; 903 Exceptions.reserve(FTI.NumExceptions); 904 for(unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) { 905 QualType ET = QualType::getFromOpaquePtr(FTI.Exceptions[ei].Ty); 906 // Check that the type is valid for an exception spec, and drop it 907 // if not. 908 if (!CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range)) 909 Exceptions.push_back(ET); 910 } 911 T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic, FTI.TypeQuals, 912 FTI.hasExceptionSpec, 913 FTI.hasAnyExceptionSpec, 914 Exceptions.size(), Exceptions.data()); 915 } else if (FTI.isVariadic) { 916 // We allow a zero-parameter variadic function in C if the 917 // function is marked with the "overloadable" 918 // attribute. Scan for this attribute now. 919 bool Overloadable = false; 920 for (const AttributeList *Attrs = D.getAttributes(); 921 Attrs; Attrs = Attrs->getNext()) { 922 if (Attrs->getKind() == AttributeList::AT_overloadable) { 923 Overloadable = true; 924 break; 925 } 926 } 927 928 if (!Overloadable) 929 Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); 930 T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic, 0); 931 } else { 932 // Simple void foo(), where the incoming T is the result type. 933 T = Context.getFunctionNoProtoType(T); 934 } 935 } else if (FTI.ArgInfo[0].Param == 0) { 936 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function definition. 937 Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 938 } else { 939 // Otherwise, we have a function with an argument list that is 940 // potentially variadic. 941 llvm::SmallVector<QualType, 16> ArgTys; 942 943 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 944 ParmVarDecl *Param = 945 cast<ParmVarDecl>(FTI.ArgInfo[i].Param.getAs<Decl>()); 946 QualType ArgTy = Param->getType(); 947 assert(!ArgTy.isNull() && "Couldn't parse type?"); 948 949 // Adjust the parameter type. 950 assert((ArgTy == adjustParameterType(ArgTy)) && "Unadjusted type?"); 951 952 // Look for 'void'. void is allowed only as a single argument to a 953 // function with no other parameters (C99 6.7.5.3p10). We record 954 // int(void) as a FunctionProtoType with an empty argument list. 955 if (ArgTy->isVoidType()) { 956 // If this is something like 'float(int, void)', reject it. 'void' 957 // is an incomplete type (C99 6.2.5p19) and function decls cannot 958 // have arguments of incomplete type. 959 if (FTI.NumArgs != 1 || FTI.isVariadic) { 960 Diag(DeclType.Loc, diag::err_void_only_param); 961 ArgTy = Context.IntTy; 962 Param->setType(ArgTy); 963 } else if (FTI.ArgInfo[i].Ident) { 964 // Reject, but continue to parse 'int(void abc)'. 965 Diag(FTI.ArgInfo[i].IdentLoc, 966 diag::err_param_with_void_type); 967 ArgTy = Context.IntTy; 968 Param->setType(ArgTy); 969 } else { 970 // Reject, but continue to parse 'float(const void)'. 971 if (ArgTy.getCVRQualifiers()) 972 Diag(DeclType.Loc, diag::err_void_param_qualified); 973 974 // Do not add 'void' to the ArgTys list. 975 break; 976 } 977 } else if (!FTI.hasPrototype) { 978 if (ArgTy->isPromotableIntegerType()) { 979 ArgTy = Context.IntTy; 980 } else if (const BuiltinType* BTy = ArgTy->getAsBuiltinType()) { 981 if (BTy->getKind() == BuiltinType::Float) 982 ArgTy = Context.DoubleTy; 983 } 984 } 985 986 ArgTys.push_back(ArgTy); 987 } 988 989 llvm::SmallVector<QualType, 4> Exceptions; 990 Exceptions.reserve(FTI.NumExceptions); 991 for(unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) { 992 QualType ET = QualType::getFromOpaquePtr(FTI.Exceptions[ei].Ty); 993 // Check that the type is valid for an exception spec, and drop it if 994 // not. 995 if (!CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range)) 996 Exceptions.push_back(ET); 997 } 998 999 T = Context.getFunctionType(T, ArgTys.data(), ArgTys.size(), 1000 FTI.isVariadic, FTI.TypeQuals, 1001 FTI.hasExceptionSpec, 1002 FTI.hasAnyExceptionSpec, 1003 Exceptions.size(), Exceptions.data()); 1004 } 1005 break; 1006 } 1007 case DeclaratorChunk::MemberPointer: 1008 // The scope spec must refer to a class, or be dependent. 1009 QualType ClsType; 1010 if (isDependentScopeSpecifier(DeclType.Mem.Scope())) { 1011 NestedNameSpecifier *NNS 1012 = (NestedNameSpecifier *)DeclType.Mem.Scope().getScopeRep(); 1013 assert(NNS->getAsType() && "Nested-name-specifier must name a type"); 1014 ClsType = QualType(NNS->getAsType(), 0); 1015 } else if (CXXRecordDecl *RD 1016 = dyn_cast_or_null<CXXRecordDecl>( 1017 computeDeclContext(DeclType.Mem.Scope()))) { 1018 ClsType = Context.getTagDeclType(RD); 1019 } else { 1020 Diag(DeclType.Mem.Scope().getBeginLoc(), 1021 diag::err_illegal_decl_mempointer_in_nonclass) 1022 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 1023 << DeclType.Mem.Scope().getRange(); 1024 D.setInvalidType(true); 1025 } 1026 1027 if (!ClsType.isNull()) 1028 T = BuildMemberPointerType(T, ClsType, DeclType.Mem.TypeQuals, 1029 DeclType.Loc, D.getIdentifier()); 1030 if (T.isNull()) { 1031 T = Context.IntTy; 1032 D.setInvalidType(true); 1033 } 1034 break; 1035 } 1036 1037 if (T.isNull()) { 1038 D.setInvalidType(true); 1039 T = Context.IntTy; 1040 } 1041 1042 // See if there are any attributes on this declarator chunk. 1043 if (const AttributeList *AL = DeclType.getAttrs()) 1044 ProcessTypeAttributeList(T, AL); 1045 } 1046 1047 if (getLangOptions().CPlusPlus && T->isFunctionType()) { 1048 const FunctionProtoType *FnTy = T->getAsFunctionProtoType(); 1049 assert(FnTy && "Why oh why is there not a FunctionProtoType here ?"); 1050 1051 // C++ 8.3.5p4: A cv-qualifier-seq shall only be part of the function type 1052 // for a nonstatic member function, the function type to which a pointer 1053 // to member refers, or the top-level function type of a function typedef 1054 // declaration. 1055 if (FnTy->getTypeQuals() != 0 && 1056 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 1057 ((D.getContext() != Declarator::MemberContext && 1058 (!D.getCXXScopeSpec().isSet() || 1059 !computeDeclContext(D.getCXXScopeSpec())->isRecord())) || 1060 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static)) { 1061 if (D.isFunctionDeclarator()) 1062 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_function_type); 1063 else 1064 Diag(D.getIdentifierLoc(), 1065 diag::err_invalid_qualified_typedef_function_type_use); 1066 1067 // Strip the cv-quals from the type. 1068 T = Context.getFunctionType(FnTy->getResultType(), FnTy->arg_type_begin(), 1069 FnTy->getNumArgs(), FnTy->isVariadic(), 0); 1070 } 1071 } 1072 1073 // If there were any type attributes applied to the decl itself (not the 1074 // type, apply the type attribute to the type!) 1075 if (const AttributeList *Attrs = D.getAttributes()) 1076 ProcessTypeAttributeList(T, Attrs); 1077 1078 return T; 1079} 1080 1081/// CheckSpecifiedExceptionType - Check if the given type is valid in an 1082/// exception specification. Incomplete types, or pointers to incomplete types 1083/// other than void are not allowed. 1084bool Sema::CheckSpecifiedExceptionType(QualType T, const SourceRange &Range) { 1085 // FIXME: This may not correctly work with the fix for core issue 437, 1086 // where a class's own type is considered complete within its body. 1087 1088 // C++ 15.4p2: A type denoted in an exception-specification shall not denote 1089 // an incomplete type. 1090 if (T->isIncompleteType()) 1091 return Diag(Range.getBegin(), diag::err_incomplete_in_exception_spec) 1092 << Range << T << /*direct*/0; 1093 1094 // C++ 15.4p2: A type denoted in an exception-specification shall not denote 1095 // an incomplete type a pointer or reference to an incomplete type, other 1096 // than (cv) void*. 1097 int kind; 1098 if (const PointerType* IT = T->getAsPointerType()) { 1099 T = IT->getPointeeType(); 1100 kind = 1; 1101 } else if (const ReferenceType* IT = T->getAsReferenceType()) { 1102 T = IT->getPointeeType(); 1103 kind = 2; 1104 } else 1105 return false; 1106 1107 if (T->isIncompleteType() && !T->isVoidType()) 1108 return Diag(Range.getBegin(), diag::err_incomplete_in_exception_spec) 1109 << Range << T << /*indirect*/kind; 1110 1111 return false; 1112} 1113 1114/// CheckDistantExceptionSpec - Check if the given type is a pointer or pointer 1115/// to member to a function with an exception specification. This means that 1116/// it is invalid to add another level of indirection. 1117bool Sema::CheckDistantExceptionSpec(QualType T) { 1118 if (const PointerType *PT = T->getAsPointerType()) 1119 T = PT->getPointeeType(); 1120 else if (const MemberPointerType *PT = T->getAsMemberPointerType()) 1121 T = PT->getPointeeType(); 1122 else 1123 return false; 1124 1125 const FunctionProtoType *FnT = T->getAsFunctionProtoType(); 1126 if (!FnT) 1127 return false; 1128 1129 return FnT->hasExceptionSpec(); 1130} 1131 1132/// ObjCGetTypeForMethodDefinition - Builds the type for a method definition 1133/// declarator 1134QualType Sema::ObjCGetTypeForMethodDefinition(DeclPtrTy D) { 1135 ObjCMethodDecl *MDecl = cast<ObjCMethodDecl>(D.getAs<Decl>()); 1136 QualType T = MDecl->getResultType(); 1137 llvm::SmallVector<QualType, 16> ArgTys; 1138 1139 // Add the first two invisible argument types for self and _cmd. 1140 if (MDecl->isInstanceMethod()) { 1141 QualType selfTy = Context.getObjCInterfaceType(MDecl->getClassInterface()); 1142 selfTy = Context.getPointerType(selfTy); 1143 ArgTys.push_back(selfTy); 1144 } else 1145 ArgTys.push_back(Context.getObjCIdType()); 1146 ArgTys.push_back(Context.getObjCSelType()); 1147 1148 for (ObjCMethodDecl::param_iterator PI = MDecl->param_begin(), 1149 E = MDecl->param_end(); PI != E; ++PI) { 1150 QualType ArgTy = (*PI)->getType(); 1151 assert(!ArgTy.isNull() && "Couldn't parse type?"); 1152 ArgTy = adjustParameterType(ArgTy); 1153 ArgTys.push_back(ArgTy); 1154 } 1155 T = Context.getFunctionType(T, &ArgTys[0], ArgTys.size(), 1156 MDecl->isVariadic(), 0); 1157 return T; 1158} 1159 1160/// UnwrapSimilarPointerTypes - If T1 and T2 are pointer types that 1161/// may be similar (C++ 4.4), replaces T1 and T2 with the type that 1162/// they point to and return true. If T1 and T2 aren't pointer types 1163/// or pointer-to-member types, or if they are not similar at this 1164/// level, returns false and leaves T1 and T2 unchanged. Top-level 1165/// qualifiers on T1 and T2 are ignored. This function will typically 1166/// be called in a loop that successively "unwraps" pointer and 1167/// pointer-to-member types to compare them at each level. 1168bool Sema::UnwrapSimilarPointerTypes(QualType& T1, QualType& T2) { 1169 const PointerType *T1PtrType = T1->getAsPointerType(), 1170 *T2PtrType = T2->getAsPointerType(); 1171 if (T1PtrType && T2PtrType) { 1172 T1 = T1PtrType->getPointeeType(); 1173 T2 = T2PtrType->getPointeeType(); 1174 return true; 1175 } 1176 1177 const MemberPointerType *T1MPType = T1->getAsMemberPointerType(), 1178 *T2MPType = T2->getAsMemberPointerType(); 1179 if (T1MPType && T2MPType && 1180 Context.getCanonicalType(T1MPType->getClass()) == 1181 Context.getCanonicalType(T2MPType->getClass())) { 1182 T1 = T1MPType->getPointeeType(); 1183 T2 = T2MPType->getPointeeType(); 1184 return true; 1185 } 1186 return false; 1187} 1188 1189Sema::TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 1190 // C99 6.7.6: Type names have no identifier. This is already validated by 1191 // the parser. 1192 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 1193 1194 TagDecl *OwnedTag = 0; 1195 QualType T = GetTypeForDeclarator(D, S, /*Skip=*/0, &OwnedTag); 1196 if (D.isInvalidType()) 1197 return true; 1198 1199 if (getLangOptions().CPlusPlus) { 1200 // Check that there are no default arguments (C++ only). 1201 CheckExtraCXXDefaultArguments(D); 1202 1203 // C++0x [dcl.type]p3: 1204 // A type-specifier-seq shall not define a class or enumeration 1205 // unless it appears in the type-id of an alias-declaration 1206 // (7.1.3). 1207 if (OwnedTag && OwnedTag->isDefinition()) 1208 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_type_specifier) 1209 << Context.getTypeDeclType(OwnedTag); 1210 } 1211 1212 return T.getAsOpaquePtr(); 1213} 1214 1215 1216 1217//===----------------------------------------------------------------------===// 1218// Type Attribute Processing 1219//===----------------------------------------------------------------------===// 1220 1221/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 1222/// specified type. The attribute contains 1 argument, the id of the address 1223/// space for the type. 1224static void HandleAddressSpaceTypeAttribute(QualType &Type, 1225 const AttributeList &Attr, Sema &S){ 1226 // If this type is already address space qualified, reject it. 1227 // Clause 6.7.3 - Type qualifiers: "No type shall be qualified by qualifiers 1228 // for two or more different address spaces." 1229 if (Type.getAddressSpace()) { 1230 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 1231 return; 1232 } 1233 1234 // Check the attribute arguments. 1235 if (Attr.getNumArgs() != 1) { 1236 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1237 return; 1238 } 1239 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 1240 llvm::APSInt addrSpace(32); 1241 if (!ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 1242 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 1243 << ASArgExpr->getSourceRange(); 1244 return; 1245 } 1246 1247 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 1248 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 1249} 1250 1251/// HandleObjCGCTypeAttribute - Process an objc's gc attribute on the 1252/// specified type. The attribute contains 1 argument, weak or strong. 1253static void HandleObjCGCTypeAttribute(QualType &Type, 1254 const AttributeList &Attr, Sema &S) { 1255 if (Type.getObjCGCAttr() != QualType::GCNone) { 1256 S.Diag(Attr.getLoc(), diag::err_attribute_multiple_objc_gc); 1257 return; 1258 } 1259 1260 // Check the attribute arguments. 1261 if (!Attr.getParameterName()) { 1262 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) 1263 << "objc_gc" << 1; 1264 return; 1265 } 1266 QualType::GCAttrTypes GCAttr; 1267 if (Attr.getNumArgs() != 0) { 1268 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1269 return; 1270 } 1271 if (Attr.getParameterName()->isStr("weak")) 1272 GCAttr = QualType::Weak; 1273 else if (Attr.getParameterName()->isStr("strong")) 1274 GCAttr = QualType::Strong; 1275 else { 1276 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported) 1277 << "objc_gc" << Attr.getParameterName(); 1278 return; 1279 } 1280 1281 Type = S.Context.getObjCGCQualType(Type, GCAttr); 1282} 1283 1284void Sema::ProcessTypeAttributeList(QualType &Result, const AttributeList *AL) { 1285 // Scan through and apply attributes to this type where it makes sense. Some 1286 // attributes (such as __address_space__, __vector_size__, etc) apply to the 1287 // type, but others can be present in the type specifiers even though they 1288 // apply to the decl. Here we apply type attributes and ignore the rest. 1289 for (; AL; AL = AL->getNext()) { 1290 // If this is an attribute we can handle, do so now, otherwise, add it to 1291 // the LeftOverAttrs list for rechaining. 1292 switch (AL->getKind()) { 1293 default: break; 1294 case AttributeList::AT_address_space: 1295 HandleAddressSpaceTypeAttribute(Result, *AL, *this); 1296 break; 1297 case AttributeList::AT_objc_gc: 1298 HandleObjCGCTypeAttribute(Result, *AL, *this); 1299 break; 1300 } 1301 } 1302} 1303 1304/// @brief Ensure that the type T is a complete type. 1305/// 1306/// This routine checks whether the type @p T is complete in any 1307/// context where a complete type is required. If @p T is a complete 1308/// type, returns false. If @p T is a class template specialization, 1309/// this routine then attempts to perform class template 1310/// instantiation. If instantiation fails, or if @p T is incomplete 1311/// and cannot be completed, issues the diagnostic @p diag (giving it 1312/// the type @p T) and returns true. 1313/// 1314/// @param Loc The location in the source that the incomplete type 1315/// diagnostic should refer to. 1316/// 1317/// @param T The type that this routine is examining for completeness. 1318/// 1319/// @param diag The diagnostic value (e.g., 1320/// @c diag::err_typecheck_decl_incomplete_type) that will be used 1321/// for the error message if @p T is incomplete. 1322/// 1323/// @param Range1 An optional range in the source code that will be a 1324/// part of the "incomplete type" error message. 1325/// 1326/// @param Range2 An optional range in the source code that will be a 1327/// part of the "incomplete type" error message. 1328/// 1329/// @param PrintType If non-NULL, the type that should be printed 1330/// instead of @p T. This parameter should be used when the type that 1331/// we're checking for incompleteness isn't the type that should be 1332/// displayed to the user, e.g., when T is a type and PrintType is a 1333/// pointer to T. 1334/// 1335/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 1336/// @c false otherwise. 1337bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, unsigned diag, 1338 SourceRange Range1, SourceRange Range2, 1339 QualType PrintType) { 1340 // FIXME: Add this assertion to help us flush out problems with 1341 // checking for dependent types and type-dependent expressions. 1342 // 1343 // assert(!T->isDependentType() && 1344 // "Can't ask whether a dependent type is complete"); 1345 1346 // If we have a complete type, we're done. 1347 if (!T->isIncompleteType()) 1348 return false; 1349 1350 // If we have a class template specialization or a class member of a 1351 // class template specialization, try to instantiate it. 1352 if (const RecordType *Record = T->getAsRecordType()) { 1353 if (ClassTemplateSpecializationDecl *ClassTemplateSpec 1354 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { 1355 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) { 1356 // Update the class template specialization's location to 1357 // refer to the point of instantiation. 1358 if (Loc.isValid()) 1359 ClassTemplateSpec->setLocation(Loc); 1360 return InstantiateClassTemplateSpecialization(ClassTemplateSpec, 1361 /*ExplicitInstantiation=*/false); 1362 } 1363 } else if (CXXRecordDecl *Rec 1364 = dyn_cast<CXXRecordDecl>(Record->getDecl())) { 1365 if (CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass()) { 1366 // Find the class template specialization that surrounds this 1367 // member class. 1368 ClassTemplateSpecializationDecl *Spec = 0; 1369 for (DeclContext *Parent = Rec->getDeclContext(); 1370 Parent && !Spec; Parent = Parent->getParent()) 1371 Spec = dyn_cast<ClassTemplateSpecializationDecl>(Parent); 1372 assert(Spec && "Not a member of a class template specialization?"); 1373 return InstantiateClass(Loc, Rec, Pattern, Spec->getTemplateArgs(), 1374 /*ExplicitInstantiation=*/false); 1375 } 1376 } 1377 } 1378 1379 if (PrintType.isNull()) 1380 PrintType = T; 1381 1382 // We have an incomplete type. Produce a diagnostic. 1383 Diag(Loc, diag) << PrintType << Range1 << Range2; 1384 1385 // If the type was a forward declaration of a class/struct/union 1386 // type, produce 1387 const TagType *Tag = 0; 1388 if (const RecordType *Record = T->getAsRecordType()) 1389 Tag = Record; 1390 else if (const EnumType *Enum = T->getAsEnumType()) 1391 Tag = Enum; 1392 1393 if (Tag && !Tag->getDecl()->isInvalidDecl()) 1394 Diag(Tag->getDecl()->getLocation(), 1395 Tag->isBeingDefined() ? diag::note_type_being_defined 1396 : diag::note_forward_declaration) 1397 << QualType(Tag, 0); 1398 1399 return true; 1400} 1401 1402/// \brief Retrieve a version of the type 'T' that is qualified by the 1403/// nested-name-specifier contained in SS. 1404QualType Sema::getQualifiedNameType(const CXXScopeSpec &SS, QualType T) { 1405 if (!SS.isSet() || SS.isInvalid() || T.isNull()) 1406 return T; 1407 1408 NestedNameSpecifier *NNS 1409 = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 1410 return Context.getQualifiedNameType(NNS, T); 1411} 1412