SemaType.cpp revision 3cc9726a493d90bd8faf094986a59352fd3461cb
1//===--- SemaType.cpp - Semantic Analysis for Types -----------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements type-related semantic analysis. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "clang/AST/ASTContext.h" 16#include "clang/AST/DeclObjC.h" 17#include "clang/AST/DeclTemplate.h" 18#include "clang/AST/Expr.h" 19#include "clang/Parse/DeclSpec.h" 20using namespace clang; 21 22/// \brief Perform adjustment on the parameter type of a function. 23/// 24/// This routine adjusts the given parameter type @p T to the actual 25/// parameter type used by semantic analysis (C99 6.7.5.3p[7,8], 26/// C++ [dcl.fct]p3). The adjusted parameter type is returned. 27QualType Sema::adjustParameterType(QualType T) { 28 // C99 6.7.5.3p7: 29 if (T->isArrayType()) { 30 // C99 6.7.5.3p7: 31 // A declaration of a parameter as "array of type" shall be 32 // adjusted to "qualified pointer to type", where the type 33 // qualifiers (if any) are those specified within the [ and ] of 34 // the array type derivation. 35 return Context.getArrayDecayedType(T); 36 } else if (T->isFunctionType()) 37 // C99 6.7.5.3p8: 38 // A declaration of a parameter as "function returning type" 39 // shall be adjusted to "pointer to function returning type", as 40 // in 6.3.2.1. 41 return Context.getPointerType(T); 42 43 return T; 44} 45 46/// \brief Convert the specified declspec to the appropriate type 47/// object. 48/// \param DS the declaration specifiers 49/// \param DeclLoc The location of the declarator identifier or invalid if none. 50/// \returns The type described by the declaration specifiers. This function 51/// never returns null. 52QualType Sema::ConvertDeclSpecToType(const DeclSpec &DS, 53 SourceLocation DeclLoc, 54 bool &isInvalid) { 55 // FIXME: Should move the logic from DeclSpec::Finish to here for validity 56 // checking. 57 QualType Result; 58 59 switch (DS.getTypeSpecType()) { 60 case DeclSpec::TST_void: 61 Result = Context.VoidTy; 62 break; 63 case DeclSpec::TST_char: 64 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 65 Result = Context.CharTy; 66 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) 67 Result = Context.SignedCharTy; 68 else { 69 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 70 "Unknown TSS value"); 71 Result = Context.UnsignedCharTy; 72 } 73 break; 74 case DeclSpec::TST_wchar: 75 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 76 Result = Context.WCharTy; 77 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) { 78 Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 79 << DS.getSpecifierName(DS.getTypeSpecType()); 80 Result = Context.getSignedWCharType(); 81 } else { 82 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 83 "Unknown TSS value"); 84 Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 85 << DS.getSpecifierName(DS.getTypeSpecType()); 86 Result = Context.getUnsignedWCharType(); 87 } 88 break; 89 case DeclSpec::TST_unspecified: 90 // "<proto1,proto2>" is an objc qualified ID with a missing id. 91 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 92 Result = Context.getObjCQualifiedIdType((ObjCProtocolDecl**)PQ, 93 DS.getNumProtocolQualifiers()); 94 break; 95 } 96 97 // Unspecified typespec defaults to int in C90. However, the C90 grammar 98 // [C90 6.5] only allows a decl-spec if there was *some* type-specifier, 99 // type-qualifier, or storage-class-specifier. If not, emit an extwarn. 100 // Note that the one exception to this is function definitions, which are 101 // allowed to be completely missing a declspec. This is handled in the 102 // parser already though by it pretending to have seen an 'int' in this 103 // case. 104 if (getLangOptions().ImplicitInt) { 105 // In C89 mode, we only warn if there is a completely missing declspec 106 // when one is not allowed. 107 if (DS.isEmpty()) { 108 if (DeclLoc.isInvalid()) 109 DeclLoc = DS.getSourceRange().getBegin(); 110 Diag(DeclLoc, diag::warn_missing_declspec) 111 << DS.getSourceRange() 112 << CodeModificationHint::CreateInsertion(DS.getSourceRange().getBegin(), 113 "int"); 114 } 115 } else if (!DS.hasTypeSpecifier()) { 116 // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says: 117 // "At least one type specifier shall be given in the declaration 118 // specifiers in each declaration, and in the specifier-qualifier list in 119 // each struct declaration and type name." 120 // FIXME: Does Microsoft really have the implicit int extension in C++? 121 if (DeclLoc.isInvalid()) 122 DeclLoc = DS.getSourceRange().getBegin(); 123 124 if (getLangOptions().CPlusPlus && !getLangOptions().Microsoft) 125 Diag(DeclLoc, diag::err_missing_type_specifier) 126 << DS.getSourceRange(); 127 else 128 Diag(DeclLoc, diag::warn_missing_type_specifier) 129 << DS.getSourceRange(); 130 131 // FIXME: If we could guarantee that the result would be well-formed, it 132 // would be useful to have a code insertion hint here. However, after 133 // emitting this warning/error, we often emit other errors. 134 } 135 136 // FALL THROUGH. 137 case DeclSpec::TST_int: { 138 if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) { 139 switch (DS.getTypeSpecWidth()) { 140 case DeclSpec::TSW_unspecified: Result = Context.IntTy; break; 141 case DeclSpec::TSW_short: Result = Context.ShortTy; break; 142 case DeclSpec::TSW_long: Result = Context.LongTy; break; 143 case DeclSpec::TSW_longlong: Result = Context.LongLongTy; break; 144 } 145 } else { 146 switch (DS.getTypeSpecWidth()) { 147 case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break; 148 case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break; 149 case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break; 150 case DeclSpec::TSW_longlong: Result =Context.UnsignedLongLongTy; break; 151 } 152 } 153 break; 154 } 155 case DeclSpec::TST_float: Result = Context.FloatTy; break; 156 case DeclSpec::TST_double: 157 if (DS.getTypeSpecWidth() == DeclSpec::TSW_long) 158 Result = Context.LongDoubleTy; 159 else 160 Result = Context.DoubleTy; 161 break; 162 case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool 163 case DeclSpec::TST_decimal32: // _Decimal32 164 case DeclSpec::TST_decimal64: // _Decimal64 165 case DeclSpec::TST_decimal128: // _Decimal128 166 Diag(DS.getTypeSpecTypeLoc(), diag::err_decimal_unsupported); 167 Result = Context.IntTy; 168 isInvalid = true; 169 break; 170 case DeclSpec::TST_class: 171 case DeclSpec::TST_enum: 172 case DeclSpec::TST_union: 173 case DeclSpec::TST_struct: { 174 Decl *D = static_cast<Decl *>(DS.getTypeRep()); 175 assert(D && "Didn't get a decl for a class/enum/union/struct?"); 176 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 177 DS.getTypeSpecSign() == 0 && 178 "Can't handle qualifiers on typedef names yet!"); 179 // TypeQuals handled by caller. 180 Result = Context.getTypeDeclType(cast<TypeDecl>(D)); 181 182 if (D->isInvalidDecl()) 183 isInvalid = true; 184 break; 185 } 186 case DeclSpec::TST_typename: { 187 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 188 DS.getTypeSpecSign() == 0 && 189 "Can't handle qualifiers on typedef names yet!"); 190 Result = QualType::getFromOpaquePtr(DS.getTypeRep()); 191 192 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 193 // FIXME: Adding a TST_objcInterface clause doesn't seem ideal, so we have 194 // this "hack" for now... 195 if (const ObjCInterfaceType *Interface = Result->getAsObjCInterfaceType()) 196 Result = Context.getObjCQualifiedInterfaceType(Interface->getDecl(), 197 (ObjCProtocolDecl**)PQ, 198 DS.getNumProtocolQualifiers()); 199 else if (Result == Context.getObjCIdType()) 200 // id<protocol-list> 201 Result = Context.getObjCQualifiedIdType((ObjCProtocolDecl**)PQ, 202 DS.getNumProtocolQualifiers()); 203 else if (Result == Context.getObjCClassType()) { 204 if (DeclLoc.isInvalid()) 205 DeclLoc = DS.getSourceRange().getBegin(); 206 // Class<protocol-list> 207 Diag(DeclLoc, diag::err_qualified_class_unsupported) 208 << DS.getSourceRange(); 209 } else { 210 if (DeclLoc.isInvalid()) 211 DeclLoc = DS.getSourceRange().getBegin(); 212 Diag(DeclLoc, diag::err_invalid_protocol_qualifiers) 213 << DS.getSourceRange(); 214 isInvalid = true; 215 } 216 } 217 218 // If this is a reference to an invalid typedef, propagate the invalidity. 219 if (TypedefType *TDT = dyn_cast<TypedefType>(Result)) 220 if (TDT->getDecl()->isInvalidDecl()) 221 isInvalid = true; 222 223 // TypeQuals handled by caller. 224 break; 225 } 226 case DeclSpec::TST_typeofType: 227 Result = QualType::getFromOpaquePtr(DS.getTypeRep()); 228 assert(!Result.isNull() && "Didn't get a type for typeof?"); 229 // TypeQuals handled by caller. 230 Result = Context.getTypeOfType(Result); 231 break; 232 case DeclSpec::TST_typeofExpr: { 233 Expr *E = static_cast<Expr *>(DS.getTypeRep()); 234 assert(E && "Didn't get an expression for typeof?"); 235 // TypeQuals handled by caller. 236 Result = Context.getTypeOfExprType(E); 237 break; 238 } 239 case DeclSpec::TST_error: 240 Result = Context.IntTy; 241 isInvalid = true; 242 break; 243 } 244 245 // Handle complex types. 246 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) { 247 if (getLangOptions().Freestanding) 248 Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex); 249 Result = Context.getComplexType(Result); 250 } 251 252 assert(DS.getTypeSpecComplex() != DeclSpec::TSC_imaginary && 253 "FIXME: imaginary types not supported yet!"); 254 255 // See if there are any attributes on the declspec that apply to the type (as 256 // opposed to the decl). 257 if (const AttributeList *AL = DS.getAttributes()) 258 ProcessTypeAttributeList(Result, AL); 259 260 // Apply const/volatile/restrict qualifiers to T. 261 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 262 263 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 264 // or incomplete types shall not be restrict-qualified." C++ also allows 265 // restrict-qualified references. 266 if (TypeQuals & QualType::Restrict) { 267 if (Result->isPointerType() || Result->isReferenceType()) { 268 QualType EltTy = Result->isPointerType() ? 269 Result->getAsPointerType()->getPointeeType() : 270 Result->getAsReferenceType()->getPointeeType(); 271 272 // If we have a pointer or reference, the pointee must have an object 273 // incomplete type. 274 if (!EltTy->isIncompleteOrObjectType()) { 275 Diag(DS.getRestrictSpecLoc(), 276 diag::err_typecheck_invalid_restrict_invalid_pointee) 277 << EltTy << DS.getSourceRange(); 278 TypeQuals &= ~QualType::Restrict; // Remove the restrict qualifier. 279 } 280 } else { 281 Diag(DS.getRestrictSpecLoc(), 282 diag::err_typecheck_invalid_restrict_not_pointer) 283 << Result << DS.getSourceRange(); 284 TypeQuals &= ~QualType::Restrict; // Remove the restrict qualifier. 285 } 286 } 287 288 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification 289 // of a function type includes any type qualifiers, the behavior is 290 // undefined." 291 if (Result->isFunctionType() && TypeQuals) { 292 // Get some location to point at, either the C or V location. 293 SourceLocation Loc; 294 if (TypeQuals & QualType::Const) 295 Loc = DS.getConstSpecLoc(); 296 else { 297 assert((TypeQuals & QualType::Volatile) && 298 "Has CV quals but not C or V?"); 299 Loc = DS.getVolatileSpecLoc(); 300 } 301 Diag(Loc, diag::warn_typecheck_function_qualifiers) 302 << Result << DS.getSourceRange(); 303 } 304 305 // C++ [dcl.ref]p1: 306 // Cv-qualified references are ill-formed except when the 307 // cv-qualifiers are introduced through the use of a typedef 308 // (7.1.3) or of a template type argument (14.3), in which 309 // case the cv-qualifiers are ignored. 310 // FIXME: Shouldn't we be checking SCS_typedef here? 311 if (DS.getTypeSpecType() == DeclSpec::TST_typename && 312 TypeQuals && Result->isReferenceType()) { 313 TypeQuals &= ~QualType::Const; 314 TypeQuals &= ~QualType::Volatile; 315 } 316 317 Result = Result.getQualifiedType(TypeQuals); 318 } 319 return Result; 320} 321 322static std::string getPrintableNameForEntity(DeclarationName Entity) { 323 if (Entity) 324 return Entity.getAsString(); 325 326 return "type name"; 327} 328 329/// \brief Build a pointer type. 330/// 331/// \param T The type to which we'll be building a pointer. 332/// 333/// \param Quals The cvr-qualifiers to be applied to the pointer type. 334/// 335/// \param Loc The location of the entity whose type involves this 336/// pointer type or, if there is no such entity, the location of the 337/// type that will have pointer type. 338/// 339/// \param Entity The name of the entity that involves the pointer 340/// type, if known. 341/// 342/// \returns A suitable pointer type, if there are no 343/// errors. Otherwise, returns a NULL type. 344QualType Sema::BuildPointerType(QualType T, unsigned Quals, 345 SourceLocation Loc, DeclarationName Entity) { 346 if (T->isReferenceType()) { 347 // C++ 8.3.2p4: There shall be no ... pointers to references ... 348 Diag(Loc, diag::err_illegal_decl_pointer_to_reference) 349 << getPrintableNameForEntity(Entity); 350 return QualType(); 351 } 352 353 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 354 // object or incomplete types shall not be restrict-qualified." 355 if ((Quals & QualType::Restrict) && !T->isIncompleteOrObjectType()) { 356 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 357 << T; 358 Quals &= ~QualType::Restrict; 359 } 360 361 // Build the pointer type. 362 return Context.getPointerType(T).getQualifiedType(Quals); 363} 364 365/// \brief Build a reference type. 366/// 367/// \param T The type to which we'll be building a reference. 368/// 369/// \param Quals The cvr-qualifiers to be applied to the reference type. 370/// 371/// \param Loc The location of the entity whose type involves this 372/// reference type or, if there is no such entity, the location of the 373/// type that will have reference type. 374/// 375/// \param Entity The name of the entity that involves the reference 376/// type, if known. 377/// 378/// \returns A suitable reference type, if there are no 379/// errors. Otherwise, returns a NULL type. 380QualType Sema::BuildReferenceType(QualType T, bool LValueRef, unsigned Quals, 381 SourceLocation Loc, DeclarationName Entity) { 382 if (LValueRef) { 383 if (const RValueReferenceType *R = T->getAsRValueReferenceType()) { 384 // C++0x [dcl.typedef]p9: If a typedef TD names a type that is a 385 // reference to a type T, and attempt to create the type "lvalue 386 // reference to cv TD" creates the type "lvalue reference to T". 387 // We use the qualifiers (restrict or none) of the original reference, 388 // not the new ones. This is consistent with GCC. 389 return Context.getLValueReferenceType(R->getPointeeType()). 390 getQualifiedType(T.getCVRQualifiers()); 391 } 392 } 393 if (T->isReferenceType()) { 394 // C++ [dcl.ref]p4: There shall be no references to references. 395 // 396 // According to C++ DR 106, references to references are only 397 // diagnosed when they are written directly (e.g., "int & &"), 398 // but not when they happen via a typedef: 399 // 400 // typedef int& intref; 401 // typedef intref& intref2; 402 // 403 // Parser::ParserDeclaratorInternal diagnoses the case where 404 // references are written directly; here, we handle the 405 // collapsing of references-to-references as described in C++ 406 // DR 106 and amended by C++ DR 540. 407 return T; 408 } 409 410 // C++ [dcl.ref]p1: 411 // A declarator that specifies the type “reference to cv void” 412 // is ill-formed. 413 if (T->isVoidType()) { 414 Diag(Loc, diag::err_reference_to_void); 415 return QualType(); 416 } 417 418 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 419 // object or incomplete types shall not be restrict-qualified." 420 if ((Quals & QualType::Restrict) && !T->isIncompleteOrObjectType()) { 421 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 422 << T; 423 Quals &= ~QualType::Restrict; 424 } 425 426 // C++ [dcl.ref]p1: 427 // [...] Cv-qualified references are ill-formed except when the 428 // cv-qualifiers are introduced through the use of a typedef 429 // (7.1.3) or of a template type argument (14.3), in which case 430 // the cv-qualifiers are ignored. 431 // 432 // We diagnose extraneous cv-qualifiers for the non-typedef, 433 // non-template type argument case within the parser. Here, we just 434 // ignore any extraneous cv-qualifiers. 435 Quals &= ~QualType::Const; 436 Quals &= ~QualType::Volatile; 437 438 // Handle restrict on references. 439 if (LValueRef) 440 return Context.getLValueReferenceType(T).getQualifiedType(Quals); 441 return Context.getRValueReferenceType(T).getQualifiedType(Quals); 442} 443 444/// \brief Build an array type. 445/// 446/// \param T The type of each element in the array. 447/// 448/// \param ASM C99 array size modifier (e.g., '*', 'static'). 449/// 450/// \param ArraySize Expression describing the size of the array. 451/// 452/// \param Quals The cvr-qualifiers to be applied to the array's 453/// element type. 454/// 455/// \param Loc The location of the entity whose type involves this 456/// array type or, if there is no such entity, the location of the 457/// type that will have array type. 458/// 459/// \param Entity The name of the entity that involves the array 460/// type, if known. 461/// 462/// \returns A suitable array type, if there are no errors. Otherwise, 463/// returns a NULL type. 464QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM, 465 Expr *ArraySize, unsigned Quals, 466 SourceLocation Loc, DeclarationName Entity) { 467 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 468 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 469 if (RequireCompleteType(Loc, T, 470 diag::err_illegal_decl_array_incomplete_type)) 471 return QualType(); 472 473 if (T->isFunctionType()) { 474 Diag(Loc, diag::err_illegal_decl_array_of_functions) 475 << getPrintableNameForEntity(Entity); 476 return QualType(); 477 } 478 479 // C++ 8.3.2p4: There shall be no ... arrays of references ... 480 if (T->isReferenceType()) { 481 Diag(Loc, diag::err_illegal_decl_array_of_references) 482 << getPrintableNameForEntity(Entity); 483 return QualType(); 484 } 485 486 if (const RecordType *EltTy = T->getAsRecordType()) { 487 // If the element type is a struct or union that contains a variadic 488 // array, accept it as a GNU extension: C99 6.7.2.1p2. 489 if (EltTy->getDecl()->hasFlexibleArrayMember()) 490 Diag(Loc, diag::ext_flexible_array_in_array) << T; 491 } else if (T->isObjCInterfaceType()) { 492 Diag(Loc, diag::err_objc_array_of_interfaces) << T; 493 return QualType(); 494 } 495 496 // C99 6.7.5.2p1: The size expression shall have integer type. 497 if (ArraySize && !ArraySize->isTypeDependent() && 498 !ArraySize->getType()->isIntegerType()) { 499 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 500 << ArraySize->getType() << ArraySize->getSourceRange(); 501 ArraySize->Destroy(Context); 502 return QualType(); 503 } 504 llvm::APSInt ConstVal(32); 505 if (!ArraySize) { 506 if (ASM == ArrayType::Star) 507 T = Context.getVariableArrayType(T, 0, ASM, Quals); 508 else 509 T = Context.getIncompleteArrayType(T, ASM, Quals); 510 } else if (ArraySize->isValueDependent()) { 511 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals); 512 } else if (!ArraySize->isIntegerConstantExpr(ConstVal, Context) || 513 (!T->isDependentType() && !T->isConstantSizeType())) { 514 // Per C99, a variable array is an array with either a non-constant 515 // size or an element type that has a non-constant-size 516 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals); 517 } else { 518 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 519 // have a value greater than zero. 520 if (ConstVal.isSigned()) { 521 if (ConstVal.isNegative()) { 522 Diag(ArraySize->getLocStart(), 523 diag::err_typecheck_negative_array_size) 524 << ArraySize->getSourceRange(); 525 return QualType(); 526 } else if (ConstVal == 0) { 527 // GCC accepts zero sized static arrays. 528 Diag(ArraySize->getLocStart(), diag::ext_typecheck_zero_array_size) 529 << ArraySize->getSourceRange(); 530 } 531 } 532 T = Context.getConstantArrayType(T, ConstVal, ASM, Quals); 533 } 534 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 535 if (!getLangOptions().C99) { 536 if (ArraySize && !ArraySize->isTypeDependent() && 537 !ArraySize->isValueDependent() && 538 !ArraySize->isIntegerConstantExpr(Context)) 539 Diag(Loc, diag::ext_vla); 540 else if (ASM != ArrayType::Normal || Quals != 0) 541 Diag(Loc, diag::ext_c99_array_usage); 542 } 543 544 return T; 545} 546 547/// \brief Build a function type. 548/// 549/// This routine checks the function type according to C++ rules and 550/// under the assumption that the result type and parameter types have 551/// just been instantiated from a template. It therefore duplicates 552/// some of the behavior of GetTypeForDeclarator, but in a much 553/// simpler form that is only suitable for this narrow use case. 554/// 555/// \param T The return type of the function. 556/// 557/// \param ParamTypes The parameter types of the function. This array 558/// will be modified to account for adjustments to the types of the 559/// function parameters. 560/// 561/// \param NumParamTypes The number of parameter types in ParamTypes. 562/// 563/// \param Variadic Whether this is a variadic function type. 564/// 565/// \param Quals The cvr-qualifiers to be applied to the function type. 566/// 567/// \param Loc The location of the entity whose type involves this 568/// function type or, if there is no such entity, the location of the 569/// type that will have function type. 570/// 571/// \param Entity The name of the entity that involves the function 572/// type, if known. 573/// 574/// \returns A suitable function type, if there are no 575/// errors. Otherwise, returns a NULL type. 576QualType Sema::BuildFunctionType(QualType T, 577 QualType *ParamTypes, 578 unsigned NumParamTypes, 579 bool Variadic, unsigned Quals, 580 SourceLocation Loc, DeclarationName Entity) { 581 if (T->isArrayType() || T->isFunctionType()) { 582 Diag(Loc, diag::err_func_returning_array_function) << T; 583 return QualType(); 584 } 585 586 bool Invalid = false; 587 for (unsigned Idx = 0; Idx < NumParamTypes; ++Idx) { 588 QualType ParamType = adjustParameterType(ParamTypes[Idx]); 589 if (ParamType->isVoidType()) { 590 Diag(Loc, diag::err_param_with_void_type); 591 Invalid = true; 592 } 593 594 ParamTypes[Idx] = ParamType; 595 } 596 597 if (Invalid) 598 return QualType(); 599 600 return Context.getFunctionType(T, ParamTypes, NumParamTypes, Variadic, 601 Quals); 602} 603 604/// GetTypeForDeclarator - Convert the type for the specified 605/// declarator to Type instances. Skip the outermost Skip type 606/// objects. 607/// 608/// If OwnedDecl is non-NULL, and this declarator's decl-specifier-seq 609/// owns the declaration of a type (e.g., the definition of a struct 610/// type), then *OwnedDecl will receive the owned declaration. 611QualType Sema::GetTypeForDeclarator(Declarator &D, Scope *S, unsigned Skip, 612 TagDecl **OwnedDecl) { 613 bool OmittedReturnType = false; 614 615 if (D.getContext() == Declarator::BlockLiteralContext 616 && Skip == 0 617 && !D.getDeclSpec().hasTypeSpecifier() 618 && (D.getNumTypeObjects() == 0 619 || (D.getNumTypeObjects() == 1 620 && D.getTypeObject(0).Kind == DeclaratorChunk::Function))) 621 OmittedReturnType = true; 622 623 // long long is a C99 feature. 624 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 625 D.getDeclSpec().getTypeSpecWidth() == DeclSpec::TSW_longlong) 626 Diag(D.getDeclSpec().getTypeSpecWidthLoc(), diag::ext_longlong); 627 628 // Determine the type of the declarator. Not all forms of declarator 629 // have a type. 630 QualType T; 631 switch (D.getKind()) { 632 case Declarator::DK_Abstract: 633 case Declarator::DK_Normal: 634 case Declarator::DK_Operator: { 635 const DeclSpec &DS = D.getDeclSpec(); 636 if (OmittedReturnType) { 637 // We default to a dependent type initially. Can be modified by 638 // the first return statement. 639 T = Context.DependentTy; 640 } else { 641 bool isInvalid = false; 642 T = ConvertDeclSpecToType(DS, D.getIdentifierLoc(), isInvalid); 643 if (isInvalid) 644 D.setInvalidType(true); 645 else if (OwnedDecl && DS.isTypeSpecOwned()) 646 *OwnedDecl = cast<TagDecl>((Decl *)DS.getTypeRep()); 647 } 648 break; 649 } 650 651 case Declarator::DK_Constructor: 652 case Declarator::DK_Destructor: 653 case Declarator::DK_Conversion: 654 // Constructors and destructors don't have return types. Use 655 // "void" instead. Conversion operators will check their return 656 // types separately. 657 T = Context.VoidTy; 658 break; 659 } 660 661 // The name we're declaring, if any. 662 DeclarationName Name; 663 if (D.getIdentifier()) 664 Name = D.getIdentifier(); 665 666 // Walk the DeclTypeInfo, building the recursive type as we go. 667 // DeclTypeInfos are ordered from the identifier out, which is 668 // opposite of what we want :). 669 for (unsigned i = Skip, e = D.getNumTypeObjects(); i != e; ++i) { 670 DeclaratorChunk &DeclType = D.getTypeObject(e-i-1+Skip); 671 switch (DeclType.Kind) { 672 default: assert(0 && "Unknown decltype!"); 673 case DeclaratorChunk::BlockPointer: 674 // If blocks are disabled, emit an error. 675 if (!LangOpts.Blocks) 676 Diag(DeclType.Loc, diag::err_blocks_disable); 677 678 if (!T.getTypePtr()->isFunctionType()) 679 Diag(D.getIdentifierLoc(), diag::err_nonfunction_block_type); 680 else 681 T = (Context.getBlockPointerType(T) 682 .getQualifiedType(DeclType.Cls.TypeQuals)); 683 break; 684 case DeclaratorChunk::Pointer: 685 // Verify that we're not building a pointer to pointer to function with 686 // exception specification. 687 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 688 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 689 D.setInvalidType(true); 690 // Build the type anyway. 691 } 692 T = BuildPointerType(T, DeclType.Ptr.TypeQuals, DeclType.Loc, Name); 693 break; 694 case DeclaratorChunk::Reference: 695 // Verify that we're not building a reference to pointer to function with 696 // exception specification. 697 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 698 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 699 D.setInvalidType(true); 700 // Build the type anyway. 701 } 702 T = BuildReferenceType(T, DeclType.Ref.LValueRef, 703 DeclType.Ref.HasRestrict ? QualType::Restrict : 0, 704 DeclType.Loc, Name); 705 break; 706 case DeclaratorChunk::Array: { 707 // Verify that we're not building an array of pointers to function with 708 // exception specification. 709 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 710 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 711 D.setInvalidType(true); 712 // Build the type anyway. 713 } 714 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 715 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 716 ArrayType::ArraySizeModifier ASM; 717 if (ATI.isStar) 718 ASM = ArrayType::Star; 719 else if (ATI.hasStatic) 720 ASM = ArrayType::Static; 721 else 722 ASM = ArrayType::Normal; 723 if (ASM == ArrayType::Star && 724 D.getContext() != Declarator::PrototypeContext) { 725 // FIXME: This check isn't quite right: it allows star in prototypes 726 // for function definitions, and disallows some edge cases detailed 727 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html 728 Diag(DeclType.Loc, diag::err_array_star_outside_prototype); 729 ASM = ArrayType::Normal; 730 D.setInvalidType(true); 731 } 732 T = BuildArrayType(T, ASM, ArraySize, ATI.TypeQuals, DeclType.Loc, Name); 733 break; 734 } 735 case DeclaratorChunk::Function: { 736 // If the function declarator has a prototype (i.e. it is not () and 737 // does not have a K&R-style identifier list), then the arguments are part 738 // of the type, otherwise the argument list is (). 739 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 740 741 // C99 6.7.5.3p1: The return type may not be a function or array type. 742 if (T->isArrayType() || T->isFunctionType()) { 743 Diag(DeclType.Loc, diag::err_func_returning_array_function) << T; 744 T = Context.IntTy; 745 D.setInvalidType(true); 746 } 747 748 if (getLangOptions().CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) { 749 // C++ [dcl.fct]p6: 750 // Types shall not be defined in return or parameter types. 751 TagDecl *Tag = cast<TagDecl>((Decl *)D.getDeclSpec().getTypeRep()); 752 if (Tag->isDefinition()) 753 Diag(Tag->getLocation(), diag::err_type_defined_in_result_type) 754 << Context.getTypeDeclType(Tag); 755 } 756 757 // Exception specs are not allowed in typedefs. Complain, but add it 758 // anyway. 759 if (FTI.hasExceptionSpec && 760 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 761 Diag(FTI.getThrowLoc(), diag::err_exception_spec_in_typedef); 762 763 if (FTI.NumArgs == 0) { 764 if (getLangOptions().CPlusPlus) { 765 // C++ 8.3.5p2: If the parameter-declaration-clause is empty, the 766 // function takes no arguments. 767 llvm::SmallVector<QualType, 4> Exceptions; 768 Exceptions.reserve(FTI.NumExceptions); 769 for(unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) { 770 QualType ET = QualType::getFromOpaquePtr(FTI.Exceptions[ei].Ty); 771 // Check that the type is valid for an exception spec, and drop it 772 // if not. 773 if (!CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range)) 774 Exceptions.push_back(ET); 775 } 776 T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic, FTI.TypeQuals, 777 FTI.hasExceptionSpec, 778 FTI.hasAnyExceptionSpec, 779 Exceptions.size(), Exceptions.data()); 780 } else if (FTI.isVariadic) { 781 // We allow a zero-parameter variadic function in C if the 782 // function is marked with the "overloadable" 783 // attribute. Scan for this attribute now. 784 bool Overloadable = false; 785 for (const AttributeList *Attrs = D.getAttributes(); 786 Attrs; Attrs = Attrs->getNext()) { 787 if (Attrs->getKind() == AttributeList::AT_overloadable) { 788 Overloadable = true; 789 break; 790 } 791 } 792 793 if (!Overloadable) 794 Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); 795 T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic, 0); 796 } else { 797 // Simple void foo(), where the incoming T is the result type. 798 T = Context.getFunctionNoProtoType(T); 799 } 800 } else if (FTI.ArgInfo[0].Param == 0) { 801 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function definition. 802 Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 803 } else { 804 // Otherwise, we have a function with an argument list that is 805 // potentially variadic. 806 llvm::SmallVector<QualType, 16> ArgTys; 807 808 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 809 ParmVarDecl *Param = 810 cast<ParmVarDecl>(FTI.ArgInfo[i].Param.getAs<Decl>()); 811 QualType ArgTy = Param->getType(); 812 assert(!ArgTy.isNull() && "Couldn't parse type?"); 813 814 // Adjust the parameter type. 815 assert((ArgTy == adjustParameterType(ArgTy)) && "Unadjusted type?"); 816 817 // Look for 'void'. void is allowed only as a single argument to a 818 // function with no other parameters (C99 6.7.5.3p10). We record 819 // int(void) as a FunctionProtoType with an empty argument list. 820 if (ArgTy->isVoidType()) { 821 // If this is something like 'float(int, void)', reject it. 'void' 822 // is an incomplete type (C99 6.2.5p19) and function decls cannot 823 // have arguments of incomplete type. 824 if (FTI.NumArgs != 1 || FTI.isVariadic) { 825 Diag(DeclType.Loc, diag::err_void_only_param); 826 ArgTy = Context.IntTy; 827 Param->setType(ArgTy); 828 } else if (FTI.ArgInfo[i].Ident) { 829 // Reject, but continue to parse 'int(void abc)'. 830 Diag(FTI.ArgInfo[i].IdentLoc, 831 diag::err_param_with_void_type); 832 ArgTy = Context.IntTy; 833 Param->setType(ArgTy); 834 } else { 835 // Reject, but continue to parse 'float(const void)'. 836 if (ArgTy.getCVRQualifiers()) 837 Diag(DeclType.Loc, diag::err_void_param_qualified); 838 839 // Do not add 'void' to the ArgTys list. 840 break; 841 } 842 } else if (!FTI.hasPrototype) { 843 if (ArgTy->isPromotableIntegerType()) { 844 ArgTy = Context.IntTy; 845 } else if (const BuiltinType* BTy = ArgTy->getAsBuiltinType()) { 846 if (BTy->getKind() == BuiltinType::Float) 847 ArgTy = Context.DoubleTy; 848 } 849 } 850 851 ArgTys.push_back(ArgTy); 852 } 853 854 llvm::SmallVector<QualType, 4> Exceptions; 855 Exceptions.reserve(FTI.NumExceptions); 856 for(unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) { 857 QualType ET = QualType::getFromOpaquePtr(FTI.Exceptions[ei].Ty); 858 // Check that the type is valid for an exception spec, and drop it if 859 // not. 860 if (!CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range)) 861 Exceptions.push_back(ET); 862 } 863 864 T = Context.getFunctionType(T, ArgTys.data(), ArgTys.size(), 865 FTI.isVariadic, FTI.TypeQuals, 866 FTI.hasExceptionSpec, 867 FTI.hasAnyExceptionSpec, 868 Exceptions.size(), Exceptions.data()); 869 } 870 break; 871 } 872 case DeclaratorChunk::MemberPointer: 873 // Verify that we're not building a pointer to pointer to function with 874 // exception specification. 875 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 876 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 877 D.setInvalidType(true); 878 // Build the type anyway. 879 } 880 // The scope spec must refer to a class, or be dependent. 881 DeclContext *DC = computeDeclContext(DeclType.Mem.Scope()); 882 QualType ClsType; 883 // FIXME: Extend for dependent types when it's actually supported. 884 // See ActOnCXXNestedNameSpecifier. 885 if (CXXRecordDecl *RD = dyn_cast_or_null<CXXRecordDecl>(DC)) { 886 ClsType = Context.getTagDeclType(RD); 887 } else { 888 if (DC) { 889 Diag(DeclType.Mem.Scope().getBeginLoc(), 890 diag::err_illegal_decl_mempointer_in_nonclass) 891 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 892 << DeclType.Mem.Scope().getRange(); 893 } 894 D.setInvalidType(true); 895 ClsType = Context.IntTy; 896 } 897 898 // C++ 8.3.3p3: A pointer to member shall not pointer to ... a member 899 // with reference type, or "cv void." 900 if (T->isReferenceType()) { 901 Diag(DeclType.Loc, diag::err_illegal_decl_pointer_to_reference) 902 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name"); 903 D.setInvalidType(true); 904 T = Context.IntTy; 905 } 906 if (T->isVoidType()) { 907 Diag(DeclType.Loc, diag::err_illegal_decl_mempointer_to_void) 908 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name"); 909 T = Context.IntTy; 910 } 911 912 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 913 // object or incomplete types shall not be restrict-qualified." 914 if ((DeclType.Mem.TypeQuals & QualType::Restrict) && 915 !T->isIncompleteOrObjectType()) { 916 Diag(DeclType.Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 917 << T; 918 DeclType.Mem.TypeQuals &= ~QualType::Restrict; 919 } 920 921 T = Context.getMemberPointerType(T, ClsType.getTypePtr()). 922 getQualifiedType(DeclType.Mem.TypeQuals); 923 924 break; 925 } 926 927 if (T.isNull()) { 928 D.setInvalidType(true); 929 T = Context.IntTy; 930 } 931 932 // See if there are any attributes on this declarator chunk. 933 if (const AttributeList *AL = DeclType.getAttrs()) 934 ProcessTypeAttributeList(T, AL); 935 } 936 937 if (getLangOptions().CPlusPlus && T->isFunctionType()) { 938 const FunctionProtoType *FnTy = T->getAsFunctionProtoType(); 939 assert(FnTy && "Why oh why is there not a FunctionProtoType here ?"); 940 941 // C++ 8.3.5p4: A cv-qualifier-seq shall only be part of the function type 942 // for a nonstatic member function, the function type to which a pointer 943 // to member refers, or the top-level function type of a function typedef 944 // declaration. 945 if (FnTy->getTypeQuals() != 0 && 946 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 947 ((D.getContext() != Declarator::MemberContext && 948 (!D.getCXXScopeSpec().isSet() || 949 !computeDeclContext(D.getCXXScopeSpec())->isRecord())) || 950 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static)) { 951 if (D.isFunctionDeclarator()) 952 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_function_type); 953 else 954 Diag(D.getIdentifierLoc(), 955 diag::err_invalid_qualified_typedef_function_type_use); 956 957 // Strip the cv-quals from the type. 958 T = Context.getFunctionType(FnTy->getResultType(), FnTy->arg_type_begin(), 959 FnTy->getNumArgs(), FnTy->isVariadic(), 0); 960 } 961 } 962 963 // If there were any type attributes applied to the decl itself (not the 964 // type, apply the type attribute to the type!) 965 if (const AttributeList *Attrs = D.getAttributes()) 966 ProcessTypeAttributeList(T, Attrs); 967 968 return T; 969} 970 971/// CheckSpecifiedExceptionType - Check if the given type is valid in an 972/// exception specification. Incomplete types, or pointers to incomplete types 973/// other than void are not allowed. 974bool Sema::CheckSpecifiedExceptionType(QualType T, const SourceRange &Range) { 975 // FIXME: This may not correctly work with the fix for core issue 437, 976 // where a class's own type is considered complete within its body. 977 978 // C++ 15.4p2: A type denoted in an exception-specification shall not denote 979 // an incomplete type. 980 if (T->isIncompleteType()) 981 return Diag(Range.getBegin(), diag::err_incomplete_in_exception_spec) 982 << Range << T << /*direct*/0; 983 984 // C++ 15.4p2: A type denoted in an exception-specification shall not denote 985 // an incomplete type a pointer or reference to an incomplete type, other 986 // than (cv) void*. 987 int kind; 988 if (const PointerType* IT = T->getAsPointerType()) { 989 T = IT->getPointeeType(); 990 kind = 1; 991 } else if (const ReferenceType* IT = T->getAsReferenceType()) { 992 T = IT->getPointeeType(); 993 kind = 2; 994 } else 995 return false; 996 997 if (T->isIncompleteType() && !T->isVoidType()) 998 return Diag(Range.getBegin(), diag::err_incomplete_in_exception_spec) 999 << Range << T << /*indirect*/kind; 1000 1001 return false; 1002} 1003 1004/// CheckDistantExceptionSpec - Check if the given type is a pointer or pointer 1005/// to member to a function with an exception specification. This means that 1006/// it is invalid to add another level of indirection. 1007bool Sema::CheckDistantExceptionSpec(QualType T) { 1008 if (const PointerType *PT = T->getAsPointerType()) 1009 T = PT->getPointeeType(); 1010 else if (const MemberPointerType *PT = T->getAsMemberPointerType()) 1011 T = PT->getPointeeType(); 1012 else 1013 return false; 1014 1015 const FunctionProtoType *FnT = T->getAsFunctionProtoType(); 1016 if (!FnT) 1017 return false; 1018 1019 return FnT->hasExceptionSpec(); 1020} 1021 1022/// ObjCGetTypeForMethodDefinition - Builds the type for a method definition 1023/// declarator 1024QualType Sema::ObjCGetTypeForMethodDefinition(DeclPtrTy D) { 1025 ObjCMethodDecl *MDecl = cast<ObjCMethodDecl>(D.getAs<Decl>()); 1026 QualType T = MDecl->getResultType(); 1027 llvm::SmallVector<QualType, 16> ArgTys; 1028 1029 // Add the first two invisible argument types for self and _cmd. 1030 if (MDecl->isInstanceMethod()) { 1031 QualType selfTy = Context.getObjCInterfaceType(MDecl->getClassInterface()); 1032 selfTy = Context.getPointerType(selfTy); 1033 ArgTys.push_back(selfTy); 1034 } else 1035 ArgTys.push_back(Context.getObjCIdType()); 1036 ArgTys.push_back(Context.getObjCSelType()); 1037 1038 for (ObjCMethodDecl::param_iterator PI = MDecl->param_begin(), 1039 E = MDecl->param_end(); PI != E; ++PI) { 1040 QualType ArgTy = (*PI)->getType(); 1041 assert(!ArgTy.isNull() && "Couldn't parse type?"); 1042 ArgTy = adjustParameterType(ArgTy); 1043 ArgTys.push_back(ArgTy); 1044 } 1045 T = Context.getFunctionType(T, &ArgTys[0], ArgTys.size(), 1046 MDecl->isVariadic(), 0); 1047 return T; 1048} 1049 1050/// UnwrapSimilarPointerTypes - If T1 and T2 are pointer types that 1051/// may be similar (C++ 4.4), replaces T1 and T2 with the type that 1052/// they point to and return true. If T1 and T2 aren't pointer types 1053/// or pointer-to-member types, or if they are not similar at this 1054/// level, returns false and leaves T1 and T2 unchanged. Top-level 1055/// qualifiers on T1 and T2 are ignored. This function will typically 1056/// be called in a loop that successively "unwraps" pointer and 1057/// pointer-to-member types to compare them at each level. 1058bool Sema::UnwrapSimilarPointerTypes(QualType& T1, QualType& T2) { 1059 const PointerType *T1PtrType = T1->getAsPointerType(), 1060 *T2PtrType = T2->getAsPointerType(); 1061 if (T1PtrType && T2PtrType) { 1062 T1 = T1PtrType->getPointeeType(); 1063 T2 = T2PtrType->getPointeeType(); 1064 return true; 1065 } 1066 1067 const MemberPointerType *T1MPType = T1->getAsMemberPointerType(), 1068 *T2MPType = T2->getAsMemberPointerType(); 1069 if (T1MPType && T2MPType && 1070 Context.getCanonicalType(T1MPType->getClass()) == 1071 Context.getCanonicalType(T2MPType->getClass())) { 1072 T1 = T1MPType->getPointeeType(); 1073 T2 = T2MPType->getPointeeType(); 1074 return true; 1075 } 1076 return false; 1077} 1078 1079Sema::TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 1080 // C99 6.7.6: Type names have no identifier. This is already validated by 1081 // the parser. 1082 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 1083 1084 TagDecl *OwnedTag = 0; 1085 QualType T = GetTypeForDeclarator(D, S, /*Skip=*/0, &OwnedTag); 1086 if (D.isInvalidType()) 1087 return true; 1088 1089 if (getLangOptions().CPlusPlus) { 1090 // Check that there are no default arguments (C++ only). 1091 CheckExtraCXXDefaultArguments(D); 1092 1093 // C++0x [dcl.type]p3: 1094 // A type-specifier-seq shall not define a class or enumeration 1095 // unless it appears in the type-id of an alias-declaration 1096 // (7.1.3). 1097 if (OwnedTag && OwnedTag->isDefinition()) 1098 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_type_specifier) 1099 << Context.getTypeDeclType(OwnedTag); 1100 } 1101 1102 return T.getAsOpaquePtr(); 1103} 1104 1105 1106 1107//===----------------------------------------------------------------------===// 1108// Type Attribute Processing 1109//===----------------------------------------------------------------------===// 1110 1111/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 1112/// specified type. The attribute contains 1 argument, the id of the address 1113/// space for the type. 1114static void HandleAddressSpaceTypeAttribute(QualType &Type, 1115 const AttributeList &Attr, Sema &S){ 1116 // If this type is already address space qualified, reject it. 1117 // Clause 6.7.3 - Type qualifiers: "No type shall be qualified by qualifiers 1118 // for two or more different address spaces." 1119 if (Type.getAddressSpace()) { 1120 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 1121 return; 1122 } 1123 1124 // Check the attribute arguments. 1125 if (Attr.getNumArgs() != 1) { 1126 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1127 return; 1128 } 1129 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 1130 llvm::APSInt addrSpace(32); 1131 if (!ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 1132 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 1133 << ASArgExpr->getSourceRange(); 1134 return; 1135 } 1136 1137 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 1138 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 1139} 1140 1141/// HandleObjCGCTypeAttribute - Process an objc's gc attribute on the 1142/// specified type. The attribute contains 1 argument, weak or strong. 1143static void HandleObjCGCTypeAttribute(QualType &Type, 1144 const AttributeList &Attr, Sema &S) { 1145 if (Type.getObjCGCAttr() != QualType::GCNone) { 1146 S.Diag(Attr.getLoc(), diag::err_attribute_multiple_objc_gc); 1147 return; 1148 } 1149 1150 // Check the attribute arguments. 1151 if (!Attr.getParameterName()) { 1152 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) 1153 << "objc_gc" << 1; 1154 return; 1155 } 1156 QualType::GCAttrTypes GCAttr; 1157 if (Attr.getNumArgs() != 0) { 1158 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1159 return; 1160 } 1161 if (Attr.getParameterName()->isStr("weak")) 1162 GCAttr = QualType::Weak; 1163 else if (Attr.getParameterName()->isStr("strong")) 1164 GCAttr = QualType::Strong; 1165 else { 1166 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported) 1167 << "objc_gc" << Attr.getParameterName(); 1168 return; 1169 } 1170 1171 Type = S.Context.getObjCGCQualType(Type, GCAttr); 1172} 1173 1174void Sema::ProcessTypeAttributeList(QualType &Result, const AttributeList *AL) { 1175 // Scan through and apply attributes to this type where it makes sense. Some 1176 // attributes (such as __address_space__, __vector_size__, etc) apply to the 1177 // type, but others can be present in the type specifiers even though they 1178 // apply to the decl. Here we apply type attributes and ignore the rest. 1179 for (; AL; AL = AL->getNext()) { 1180 // If this is an attribute we can handle, do so now, otherwise, add it to 1181 // the LeftOverAttrs list for rechaining. 1182 switch (AL->getKind()) { 1183 default: break; 1184 case AttributeList::AT_address_space: 1185 HandleAddressSpaceTypeAttribute(Result, *AL, *this); 1186 break; 1187 case AttributeList::AT_objc_gc: 1188 HandleObjCGCTypeAttribute(Result, *AL, *this); 1189 break; 1190 } 1191 } 1192} 1193 1194/// @brief Ensure that the type T is a complete type. 1195/// 1196/// This routine checks whether the type @p T is complete in any 1197/// context where a complete type is required. If @p T is a complete 1198/// type, returns false. If @p T is a class template specialization, 1199/// this routine then attempts to perform class template 1200/// instantiation. If instantiation fails, or if @p T is incomplete 1201/// and cannot be completed, issues the diagnostic @p diag (giving it 1202/// the type @p T) and returns true. 1203/// 1204/// @param Loc The location in the source that the incomplete type 1205/// diagnostic should refer to. 1206/// 1207/// @param T The type that this routine is examining for completeness. 1208/// 1209/// @param diag The diagnostic value (e.g., 1210/// @c diag::err_typecheck_decl_incomplete_type) that will be used 1211/// for the error message if @p T is incomplete. 1212/// 1213/// @param Range1 An optional range in the source code that will be a 1214/// part of the "incomplete type" error message. 1215/// 1216/// @param Range2 An optional range in the source code that will be a 1217/// part of the "incomplete type" error message. 1218/// 1219/// @param PrintType If non-NULL, the type that should be printed 1220/// instead of @p T. This parameter should be used when the type that 1221/// we're checking for incompleteness isn't the type that should be 1222/// displayed to the user, e.g., when T is a type and PrintType is a 1223/// pointer to T. 1224/// 1225/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 1226/// @c false otherwise. 1227bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, unsigned diag, 1228 SourceRange Range1, SourceRange Range2, 1229 QualType PrintType) { 1230 // FIXME: Add this assertion to help us flush out problems with 1231 // checking for dependent types and type-dependent expressions. 1232 // 1233 // assert(!T->isDependentType() && 1234 // "Can't ask whether a dependent type is complete"); 1235 1236 // If we have a complete type, we're done. 1237 if (!T->isIncompleteType()) 1238 return false; 1239 1240 // If we have a class template specialization or a class member of a 1241 // class template specialization, try to instantiate it. 1242 if (const RecordType *Record = T->getAsRecordType()) { 1243 if (ClassTemplateSpecializationDecl *ClassTemplateSpec 1244 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { 1245 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) { 1246 // Update the class template specialization's location to 1247 // refer to the point of instantiation. 1248 if (Loc.isValid()) 1249 ClassTemplateSpec->setLocation(Loc); 1250 return InstantiateClassTemplateSpecialization(ClassTemplateSpec, 1251 /*ExplicitInstantiation=*/false); 1252 } 1253 } else if (CXXRecordDecl *Rec 1254 = dyn_cast<CXXRecordDecl>(Record->getDecl())) { 1255 if (CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass()) { 1256 // Find the class template specialization that surrounds this 1257 // member class. 1258 ClassTemplateSpecializationDecl *Spec = 0; 1259 for (DeclContext *Parent = Rec->getDeclContext(); 1260 Parent && !Spec; Parent = Parent->getParent()) 1261 Spec = dyn_cast<ClassTemplateSpecializationDecl>(Parent); 1262 assert(Spec && "Not a member of a class template specialization?"); 1263 return InstantiateClass(Loc, Rec, Pattern, Spec->getTemplateArgs(), 1264 /*ExplicitInstantiation=*/false); 1265 } 1266 } 1267 } 1268 1269 if (PrintType.isNull()) 1270 PrintType = T; 1271 1272 // We have an incomplete type. Produce a diagnostic. 1273 Diag(Loc, diag) << PrintType << Range1 << Range2; 1274 1275 // If the type was a forward declaration of a class/struct/union 1276 // type, produce 1277 const TagType *Tag = 0; 1278 if (const RecordType *Record = T->getAsRecordType()) 1279 Tag = Record; 1280 else if (const EnumType *Enum = T->getAsEnumType()) 1281 Tag = Enum; 1282 1283 if (Tag && !Tag->getDecl()->isInvalidDecl()) 1284 Diag(Tag->getDecl()->getLocation(), 1285 Tag->isBeingDefined() ? diag::note_type_being_defined 1286 : diag::note_forward_declaration) 1287 << QualType(Tag, 0); 1288 1289 return true; 1290} 1291 1292/// \brief Retrieve a version of the type 'T' that is qualified by the 1293/// nested-name-specifier contained in SS. 1294QualType Sema::getQualifiedNameType(const CXXScopeSpec &SS, QualType T) { 1295 if (!SS.isSet() || SS.isInvalid() || T.isNull()) 1296 return T; 1297 1298 NestedNameSpecifier *NNS 1299 = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 1300 return Context.getQualifiedNameType(NNS, T); 1301} 1302