SemaType.cpp revision 6fd634f4ac59f5923cffadadb99d19f23c18707a
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 else 128 Diag(DeclLoc, diag::ext_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_decltype: { 240 Expr *E = static_cast<Expr *>(DS.getTypeRep()); 241 assert(E && "Didn't get an expression for decltype?"); 242 // TypeQuals handled by caller. 243 244 // FIXME: Use the right type! 245 Result = Context.IntTy; 246 isInvalid = true; 247 break; 248 } 249 250 case DeclSpec::TST_error: 251 Result = Context.IntTy; 252 isInvalid = true; 253 break; 254 } 255 256 // Handle complex types. 257 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) { 258 if (getLangOptions().Freestanding) 259 Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex); 260 Result = Context.getComplexType(Result); 261 } 262 263 assert(DS.getTypeSpecComplex() != DeclSpec::TSC_imaginary && 264 "FIXME: imaginary types not supported yet!"); 265 266 // See if there are any attributes on the declspec that apply to the type (as 267 // opposed to the decl). 268 if (const AttributeList *AL = DS.getAttributes()) 269 ProcessTypeAttributeList(Result, AL); 270 271 // Apply const/volatile/restrict qualifiers to T. 272 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 273 274 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 275 // or incomplete types shall not be restrict-qualified." C++ also allows 276 // restrict-qualified references. 277 if (TypeQuals & QualType::Restrict) { 278 if (Result->isPointerType() || Result->isReferenceType()) { 279 QualType EltTy = Result->isPointerType() ? 280 Result->getAsPointerType()->getPointeeType() : 281 Result->getAsReferenceType()->getPointeeType(); 282 283 // If we have a pointer or reference, the pointee must have an object 284 // incomplete type. 285 if (!EltTy->isIncompleteOrObjectType()) { 286 Diag(DS.getRestrictSpecLoc(), 287 diag::err_typecheck_invalid_restrict_invalid_pointee) 288 << EltTy << DS.getSourceRange(); 289 TypeQuals &= ~QualType::Restrict; // Remove the restrict qualifier. 290 } 291 } else { 292 Diag(DS.getRestrictSpecLoc(), 293 diag::err_typecheck_invalid_restrict_not_pointer) 294 << Result << DS.getSourceRange(); 295 TypeQuals &= ~QualType::Restrict; // Remove the restrict qualifier. 296 } 297 } 298 299 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification 300 // of a function type includes any type qualifiers, the behavior is 301 // undefined." 302 if (Result->isFunctionType() && TypeQuals) { 303 // Get some location to point at, either the C or V location. 304 SourceLocation Loc; 305 if (TypeQuals & QualType::Const) 306 Loc = DS.getConstSpecLoc(); 307 else { 308 assert((TypeQuals & QualType::Volatile) && 309 "Has CV quals but not C or V?"); 310 Loc = DS.getVolatileSpecLoc(); 311 } 312 Diag(Loc, diag::warn_typecheck_function_qualifiers) 313 << Result << DS.getSourceRange(); 314 } 315 316 // C++ [dcl.ref]p1: 317 // Cv-qualified references are ill-formed except when the 318 // cv-qualifiers are introduced through the use of a typedef 319 // (7.1.3) or of a template type argument (14.3), in which 320 // case the cv-qualifiers are ignored. 321 // FIXME: Shouldn't we be checking SCS_typedef here? 322 if (DS.getTypeSpecType() == DeclSpec::TST_typename && 323 TypeQuals && Result->isReferenceType()) { 324 TypeQuals &= ~QualType::Const; 325 TypeQuals &= ~QualType::Volatile; 326 } 327 328 Result = Result.getQualifiedType(TypeQuals); 329 } 330 return Result; 331} 332 333static std::string getPrintableNameForEntity(DeclarationName Entity) { 334 if (Entity) 335 return Entity.getAsString(); 336 337 return "type name"; 338} 339 340/// \brief Build a pointer type. 341/// 342/// \param T The type to which we'll be building a pointer. 343/// 344/// \param Quals The cvr-qualifiers to be applied to the pointer type. 345/// 346/// \param Loc The location of the entity whose type involves this 347/// pointer type or, if there is no such entity, the location of the 348/// type that will have pointer type. 349/// 350/// \param Entity The name of the entity that involves the pointer 351/// type, if known. 352/// 353/// \returns A suitable pointer type, if there are no 354/// errors. Otherwise, returns a NULL type. 355QualType Sema::BuildPointerType(QualType T, unsigned Quals, 356 SourceLocation Loc, DeclarationName Entity) { 357 if (T->isReferenceType()) { 358 // C++ 8.3.2p4: There shall be no ... pointers to references ... 359 Diag(Loc, diag::err_illegal_decl_pointer_to_reference) 360 << getPrintableNameForEntity(Entity); 361 return QualType(); 362 } 363 364 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 365 // object or incomplete types shall not be restrict-qualified." 366 if ((Quals & QualType::Restrict) && !T->isIncompleteOrObjectType()) { 367 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 368 << T; 369 Quals &= ~QualType::Restrict; 370 } 371 372 // Build the pointer type. 373 return Context.getPointerType(T).getQualifiedType(Quals); 374} 375 376/// \brief Build a reference type. 377/// 378/// \param T The type to which we'll be building a reference. 379/// 380/// \param Quals The cvr-qualifiers to be applied to the reference type. 381/// 382/// \param Loc The location of the entity whose type involves this 383/// reference type or, if there is no such entity, the location of the 384/// type that will have reference type. 385/// 386/// \param Entity The name of the entity that involves the reference 387/// type, if known. 388/// 389/// \returns A suitable reference type, if there are no 390/// errors. Otherwise, returns a NULL type. 391QualType Sema::BuildReferenceType(QualType T, bool LValueRef, unsigned Quals, 392 SourceLocation Loc, DeclarationName Entity) { 393 if (LValueRef) { 394 if (const RValueReferenceType *R = T->getAsRValueReferenceType()) { 395 // C++0x [dcl.typedef]p9: If a typedef TD names a type that is a 396 // reference to a type T, and attempt to create the type "lvalue 397 // reference to cv TD" creates the type "lvalue reference to T". 398 // We use the qualifiers (restrict or none) of the original reference, 399 // not the new ones. This is consistent with GCC. 400 return Context.getLValueReferenceType(R->getPointeeType()). 401 getQualifiedType(T.getCVRQualifiers()); 402 } 403 } 404 if (T->isReferenceType()) { 405 // C++ [dcl.ref]p4: There shall be no references to references. 406 // 407 // According to C++ DR 106, references to references are only 408 // diagnosed when they are written directly (e.g., "int & &"), 409 // but not when they happen via a typedef: 410 // 411 // typedef int& intref; 412 // typedef intref& intref2; 413 // 414 // Parser::ParserDeclaratorInternal diagnoses the case where 415 // references are written directly; here, we handle the 416 // collapsing of references-to-references as described in C++ 417 // DR 106 and amended by C++ DR 540. 418 return T; 419 } 420 421 // C++ [dcl.ref]p1: 422 // A declarator that specifies the type “reference to cv void” 423 // is ill-formed. 424 if (T->isVoidType()) { 425 Diag(Loc, diag::err_reference_to_void); 426 return QualType(); 427 } 428 429 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 430 // object or incomplete types shall not be restrict-qualified." 431 if ((Quals & QualType::Restrict) && !T->isIncompleteOrObjectType()) { 432 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 433 << T; 434 Quals &= ~QualType::Restrict; 435 } 436 437 // C++ [dcl.ref]p1: 438 // [...] Cv-qualified references are ill-formed except when the 439 // cv-qualifiers are introduced through the use of a typedef 440 // (7.1.3) or of a template type argument (14.3), in which case 441 // the cv-qualifiers are ignored. 442 // 443 // We diagnose extraneous cv-qualifiers for the non-typedef, 444 // non-template type argument case within the parser. Here, we just 445 // ignore any extraneous cv-qualifiers. 446 Quals &= ~QualType::Const; 447 Quals &= ~QualType::Volatile; 448 449 // Handle restrict on references. 450 if (LValueRef) 451 return Context.getLValueReferenceType(T).getQualifiedType(Quals); 452 return Context.getRValueReferenceType(T).getQualifiedType(Quals); 453} 454 455/// \brief Build an array type. 456/// 457/// \param T The type of each element in the array. 458/// 459/// \param ASM C99 array size modifier (e.g., '*', 'static'). 460/// 461/// \param ArraySize Expression describing the size of the array. 462/// 463/// \param Quals The cvr-qualifiers to be applied to the array's 464/// element type. 465/// 466/// \param Loc The location of the entity whose type involves this 467/// array type or, if there is no such entity, the location of the 468/// type that will have array type. 469/// 470/// \param Entity The name of the entity that involves the array 471/// type, if known. 472/// 473/// \returns A suitable array type, if there are no errors. Otherwise, 474/// returns a NULL type. 475QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM, 476 Expr *ArraySize, unsigned Quals, 477 SourceLocation Loc, DeclarationName Entity) { 478 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 479 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 480 if (RequireCompleteType(Loc, T, 481 diag::err_illegal_decl_array_incomplete_type)) 482 return QualType(); 483 484 if (T->isFunctionType()) { 485 Diag(Loc, diag::err_illegal_decl_array_of_functions) 486 << getPrintableNameForEntity(Entity); 487 return QualType(); 488 } 489 490 // C++ 8.3.2p4: There shall be no ... arrays of references ... 491 if (T->isReferenceType()) { 492 Diag(Loc, diag::err_illegal_decl_array_of_references) 493 << getPrintableNameForEntity(Entity); 494 return QualType(); 495 } 496 497 if (const RecordType *EltTy = T->getAsRecordType()) { 498 // If the element type is a struct or union that contains a variadic 499 // array, accept it as a GNU extension: C99 6.7.2.1p2. 500 if (EltTy->getDecl()->hasFlexibleArrayMember()) 501 Diag(Loc, diag::ext_flexible_array_in_array) << T; 502 } else if (T->isObjCInterfaceType()) { 503 Diag(Loc, diag::err_objc_array_of_interfaces) << T; 504 return QualType(); 505 } 506 507 // C99 6.7.5.2p1: The size expression shall have integer type. 508 if (ArraySize && !ArraySize->isTypeDependent() && 509 !ArraySize->getType()->isIntegerType()) { 510 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 511 << ArraySize->getType() << ArraySize->getSourceRange(); 512 ArraySize->Destroy(Context); 513 return QualType(); 514 } 515 llvm::APSInt ConstVal(32); 516 if (!ArraySize) { 517 if (ASM == ArrayType::Star) 518 T = Context.getVariableArrayType(T, 0, ASM, Quals); 519 else 520 T = Context.getIncompleteArrayType(T, ASM, Quals); 521 } else if (ArraySize->isValueDependent()) { 522 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals); 523 } else if (!ArraySize->isIntegerConstantExpr(ConstVal, Context) || 524 (!T->isDependentType() && !T->isConstantSizeType())) { 525 // Per C99, a variable array is an array with either a non-constant 526 // size or an element type that has a non-constant-size 527 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals); 528 } else { 529 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 530 // have a value greater than zero. 531 if (ConstVal.isSigned()) { 532 if (ConstVal.isNegative()) { 533 Diag(ArraySize->getLocStart(), 534 diag::err_typecheck_negative_array_size) 535 << ArraySize->getSourceRange(); 536 return QualType(); 537 } else if (ConstVal == 0) { 538 // GCC accepts zero sized static arrays. 539 Diag(ArraySize->getLocStart(), diag::ext_typecheck_zero_array_size) 540 << ArraySize->getSourceRange(); 541 } 542 } 543 T = Context.getConstantArrayType(T, ConstVal, ASM, Quals); 544 } 545 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 546 if (!getLangOptions().C99) { 547 if (ArraySize && !ArraySize->isTypeDependent() && 548 !ArraySize->isValueDependent() && 549 !ArraySize->isIntegerConstantExpr(Context)) 550 Diag(Loc, diag::ext_vla); 551 else if (ASM != ArrayType::Normal || Quals != 0) 552 Diag(Loc, diag::ext_c99_array_usage); 553 } 554 555 return T; 556} 557 558/// \brief Build an ext-vector type. 559/// 560/// Run the required checks for the extended vector type. 561QualType Sema::BuildExtVectorType(QualType T, ExprArg ArraySize, 562 SourceLocation AttrLoc) { 563 564 Expr *Arg = (Expr *)ArraySize.get(); 565 566 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 567 // in conjunction with complex types (pointers, arrays, functions, etc.). 568 if (!T->isDependentType() && 569 !T->isIntegerType() && !T->isRealFloatingType()) { 570 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T; 571 return QualType(); 572 } 573 574 if (!Arg->isTypeDependent() && !Arg->isValueDependent()) { 575 llvm::APSInt vecSize(32); 576 if (!Arg->isIntegerConstantExpr(vecSize, Context)) { 577 Diag(AttrLoc, diag::err_attribute_argument_not_int) 578 << "ext_vector_type" << Arg->getSourceRange(); 579 return QualType(); 580 } 581 582 // unlike gcc's vector_size attribute, the size is specified as the 583 // number of elements, not the number of bytes. 584 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 585 586 if (vectorSize == 0) { 587 Diag(AttrLoc, diag::err_attribute_zero_size) 588 << Arg->getSourceRange(); 589 return QualType(); 590 } 591 592 if (!T->isDependentType()) 593 return Context.getExtVectorType(T, vectorSize); 594 } 595 596 return Context.getDependentSizedExtVectorType(T, ArraySize.takeAs<Expr>(), 597 AttrLoc); 598} 599 600/// \brief Build a function type. 601/// 602/// This routine checks the function type according to C++ rules and 603/// under the assumption that the result type and parameter types have 604/// just been instantiated from a template. It therefore duplicates 605/// some of the behavior of GetTypeForDeclarator, but in a much 606/// simpler form that is only suitable for this narrow use case. 607/// 608/// \param T The return type of the function. 609/// 610/// \param ParamTypes The parameter types of the function. This array 611/// will be modified to account for adjustments to the types of the 612/// function parameters. 613/// 614/// \param NumParamTypes The number of parameter types in ParamTypes. 615/// 616/// \param Variadic Whether this is a variadic function type. 617/// 618/// \param Quals The cvr-qualifiers to be applied to the function type. 619/// 620/// \param Loc The location of the entity whose type involves this 621/// function type or, if there is no such entity, the location of the 622/// type that will have function type. 623/// 624/// \param Entity The name of the entity that involves the function 625/// type, if known. 626/// 627/// \returns A suitable function type, if there are no 628/// errors. Otherwise, returns a NULL type. 629QualType Sema::BuildFunctionType(QualType T, 630 QualType *ParamTypes, 631 unsigned NumParamTypes, 632 bool Variadic, unsigned Quals, 633 SourceLocation Loc, DeclarationName Entity) { 634 if (T->isArrayType() || T->isFunctionType()) { 635 Diag(Loc, diag::err_func_returning_array_function) << T; 636 return QualType(); 637 } 638 639 bool Invalid = false; 640 for (unsigned Idx = 0; Idx < NumParamTypes; ++Idx) { 641 QualType ParamType = adjustParameterType(ParamTypes[Idx]); 642 if (ParamType->isVoidType()) { 643 Diag(Loc, diag::err_param_with_void_type); 644 Invalid = true; 645 } 646 647 ParamTypes[Idx] = ParamType; 648 } 649 650 if (Invalid) 651 return QualType(); 652 653 return Context.getFunctionType(T, ParamTypes, NumParamTypes, Variadic, 654 Quals); 655} 656 657/// \brief Build a member pointer type \c T Class::*. 658/// 659/// \param T the type to which the member pointer refers. 660/// \param Class the class type into which the member pointer points. 661/// \param Quals Qualifiers applied to the member pointer type 662/// \param Loc the location where this type begins 663/// \param Entity the name of the entity that will have this member pointer type 664/// 665/// \returns a member pointer type, if successful, or a NULL type if there was 666/// an error. 667QualType Sema::BuildMemberPointerType(QualType T, QualType Class, 668 unsigned Quals, SourceLocation Loc, 669 DeclarationName Entity) { 670 // Verify that we're not building a pointer to pointer to function with 671 // exception specification. 672 if (CheckDistantExceptionSpec(T)) { 673 Diag(Loc, diag::err_distant_exception_spec); 674 675 // FIXME: If we're doing this as part of template instantiation, 676 // we should return immediately. 677 678 // Build the type anyway, but use the canonical type so that the 679 // exception specifiers are stripped off. 680 T = Context.getCanonicalType(T); 681 } 682 683 // C++ 8.3.3p3: A pointer to member shall not pointer to ... a member 684 // with reference type, or "cv void." 685 if (T->isReferenceType()) { 686 Diag(Loc, diag::err_illegal_decl_pointer_to_reference) 687 << (Entity? Entity.getAsString() : "type name"); 688 return QualType(); 689 } 690 691 if (T->isVoidType()) { 692 Diag(Loc, diag::err_illegal_decl_mempointer_to_void) 693 << (Entity? Entity.getAsString() : "type name"); 694 return QualType(); 695 } 696 697 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 698 // object or incomplete types shall not be restrict-qualified." 699 if ((Quals & QualType::Restrict) && !T->isIncompleteOrObjectType()) { 700 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 701 << T; 702 703 // FIXME: If we're doing this as part of template instantiation, 704 // we should return immediately. 705 Quals &= ~QualType::Restrict; 706 } 707 708 if (!Class->isDependentType() && !Class->isRecordType()) { 709 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class; 710 return QualType(); 711 } 712 713 return Context.getMemberPointerType(T, Class.getTypePtr()) 714 .getQualifiedType(Quals); 715} 716 717/// \brief Build a block pointer type. 718/// 719/// \param T The type to which we'll be building a block pointer. 720/// 721/// \param Quals The cvr-qualifiers to be applied to the block pointer type. 722/// 723/// \param Loc The location of the entity whose type involves this 724/// block pointer type or, if there is no such entity, the location of the 725/// type that will have block pointer type. 726/// 727/// \param Entity The name of the entity that involves the block pointer 728/// type, if known. 729/// 730/// \returns A suitable block pointer type, if there are no 731/// errors. Otherwise, returns a NULL type. 732QualType Sema::BuildBlockPointerType(QualType T, unsigned Quals, 733 SourceLocation Loc, 734 DeclarationName Entity) { 735 if (!T.getTypePtr()->isFunctionType()) { 736 Diag(Loc, diag::err_nonfunction_block_type); 737 return QualType(); 738 } 739 740 return Context.getBlockPointerType(T).getQualifiedType(Quals); 741} 742 743/// GetTypeForDeclarator - Convert the type for the specified 744/// declarator to Type instances. Skip the outermost Skip type 745/// objects. 746/// 747/// If OwnedDecl is non-NULL, and this declarator's decl-specifier-seq 748/// owns the declaration of a type (e.g., the definition of a struct 749/// type), then *OwnedDecl will receive the owned declaration. 750QualType Sema::GetTypeForDeclarator(Declarator &D, Scope *S, unsigned Skip, 751 TagDecl **OwnedDecl) { 752 bool OmittedReturnType = false; 753 754 if (D.getContext() == Declarator::BlockLiteralContext 755 && Skip == 0 756 && !D.getDeclSpec().hasTypeSpecifier() 757 && (D.getNumTypeObjects() == 0 758 || (D.getNumTypeObjects() == 1 759 && D.getTypeObject(0).Kind == DeclaratorChunk::Function))) 760 OmittedReturnType = true; 761 762 // long long is a C99 feature. 763 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 764 D.getDeclSpec().getTypeSpecWidth() == DeclSpec::TSW_longlong) 765 Diag(D.getDeclSpec().getTypeSpecWidthLoc(), diag::ext_longlong); 766 767 // Determine the type of the declarator. Not all forms of declarator 768 // have a type. 769 QualType T; 770 switch (D.getKind()) { 771 case Declarator::DK_Abstract: 772 case Declarator::DK_Normal: 773 case Declarator::DK_Operator: { 774 const DeclSpec &DS = D.getDeclSpec(); 775 if (OmittedReturnType) { 776 // We default to a dependent type initially. Can be modified by 777 // the first return statement. 778 T = Context.DependentTy; 779 } else { 780 bool isInvalid = false; 781 T = ConvertDeclSpecToType(DS, D.getIdentifierLoc(), isInvalid); 782 if (isInvalid) 783 D.setInvalidType(true); 784 else if (OwnedDecl && DS.isTypeSpecOwned()) 785 *OwnedDecl = cast<TagDecl>((Decl *)DS.getTypeRep()); 786 } 787 break; 788 } 789 790 case Declarator::DK_Constructor: 791 case Declarator::DK_Destructor: 792 case Declarator::DK_Conversion: 793 // Constructors and destructors don't have return types. Use 794 // "void" instead. Conversion operators will check their return 795 // types separately. 796 T = Context.VoidTy; 797 break; 798 } 799 800 // The name we're declaring, if any. 801 DeclarationName Name; 802 if (D.getIdentifier()) 803 Name = D.getIdentifier(); 804 805 // Walk the DeclTypeInfo, building the recursive type as we go. 806 // DeclTypeInfos are ordered from the identifier out, which is 807 // opposite of what we want :). 808 for (unsigned i = Skip, e = D.getNumTypeObjects(); i != e; ++i) { 809 DeclaratorChunk &DeclType = D.getTypeObject(e-i-1+Skip); 810 switch (DeclType.Kind) { 811 default: assert(0 && "Unknown decltype!"); 812 case DeclaratorChunk::BlockPointer: 813 // If blocks are disabled, emit an error. 814 if (!LangOpts.Blocks) 815 Diag(DeclType.Loc, diag::err_blocks_disable); 816 817 T = BuildBlockPointerType(T, DeclType.Cls.TypeQuals, D.getIdentifierLoc(), 818 Name); 819 break; 820 case DeclaratorChunk::Pointer: 821 // Verify that we're not building a pointer to pointer to function with 822 // exception specification. 823 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 824 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 825 D.setInvalidType(true); 826 // Build the type anyway. 827 } 828 T = BuildPointerType(T, DeclType.Ptr.TypeQuals, DeclType.Loc, Name); 829 break; 830 case DeclaratorChunk::Reference: 831 // Verify that we're not building a reference to pointer to function with 832 // exception specification. 833 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 834 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 835 D.setInvalidType(true); 836 // Build the type anyway. 837 } 838 T = BuildReferenceType(T, DeclType.Ref.LValueRef, 839 DeclType.Ref.HasRestrict ? QualType::Restrict : 0, 840 DeclType.Loc, Name); 841 break; 842 case DeclaratorChunk::Array: { 843 // Verify that we're not building an array of pointers to function with 844 // exception specification. 845 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 846 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 847 D.setInvalidType(true); 848 // Build the type anyway. 849 } 850 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 851 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 852 ArrayType::ArraySizeModifier ASM; 853 if (ATI.isStar) 854 ASM = ArrayType::Star; 855 else if (ATI.hasStatic) 856 ASM = ArrayType::Static; 857 else 858 ASM = ArrayType::Normal; 859 if (ASM == ArrayType::Star && 860 D.getContext() != Declarator::PrototypeContext) { 861 // FIXME: This check isn't quite right: it allows star in prototypes 862 // for function definitions, and disallows some edge cases detailed 863 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html 864 Diag(DeclType.Loc, diag::err_array_star_outside_prototype); 865 ASM = ArrayType::Normal; 866 D.setInvalidType(true); 867 } 868 T = BuildArrayType(T, ASM, ArraySize, ATI.TypeQuals, DeclType.Loc, Name); 869 break; 870 } 871 case DeclaratorChunk::Function: { 872 // If the function declarator has a prototype (i.e. it is not () and 873 // does not have a K&R-style identifier list), then the arguments are part 874 // of the type, otherwise the argument list is (). 875 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 876 877 // C99 6.7.5.3p1: The return type may not be a function or array type. 878 if (T->isArrayType() || T->isFunctionType()) { 879 Diag(DeclType.Loc, diag::err_func_returning_array_function) << T; 880 T = Context.IntTy; 881 D.setInvalidType(true); 882 } 883 884 if (getLangOptions().CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) { 885 // C++ [dcl.fct]p6: 886 // Types shall not be defined in return or parameter types. 887 TagDecl *Tag = cast<TagDecl>((Decl *)D.getDeclSpec().getTypeRep()); 888 if (Tag->isDefinition()) 889 Diag(Tag->getLocation(), diag::err_type_defined_in_result_type) 890 << Context.getTypeDeclType(Tag); 891 } 892 893 // Exception specs are not allowed in typedefs. Complain, but add it 894 // anyway. 895 if (FTI.hasExceptionSpec && 896 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 897 Diag(FTI.getThrowLoc(), diag::err_exception_spec_in_typedef); 898 899 if (FTI.NumArgs == 0) { 900 if (getLangOptions().CPlusPlus) { 901 // C++ 8.3.5p2: If the parameter-declaration-clause is empty, the 902 // function takes no arguments. 903 llvm::SmallVector<QualType, 4> Exceptions; 904 Exceptions.reserve(FTI.NumExceptions); 905 for(unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) { 906 QualType ET = QualType::getFromOpaquePtr(FTI.Exceptions[ei].Ty); 907 // Check that the type is valid for an exception spec, and drop it 908 // if not. 909 if (!CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range)) 910 Exceptions.push_back(ET); 911 } 912 T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic, FTI.TypeQuals, 913 FTI.hasExceptionSpec, 914 FTI.hasAnyExceptionSpec, 915 Exceptions.size(), Exceptions.data()); 916 } else if (FTI.isVariadic) { 917 // We allow a zero-parameter variadic function in C if the 918 // function is marked with the "overloadable" 919 // attribute. Scan for this attribute now. 920 bool Overloadable = false; 921 for (const AttributeList *Attrs = D.getAttributes(); 922 Attrs; Attrs = Attrs->getNext()) { 923 if (Attrs->getKind() == AttributeList::AT_overloadable) { 924 Overloadable = true; 925 break; 926 } 927 } 928 929 if (!Overloadable) 930 Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); 931 T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic, 0); 932 } else { 933 // Simple void foo(), where the incoming T is the result type. 934 T = Context.getFunctionNoProtoType(T); 935 } 936 } else if (FTI.ArgInfo[0].Param == 0) { 937 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function definition. 938 Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 939 } else { 940 // Otherwise, we have a function with an argument list that is 941 // potentially variadic. 942 llvm::SmallVector<QualType, 16> ArgTys; 943 944 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 945 ParmVarDecl *Param = 946 cast<ParmVarDecl>(FTI.ArgInfo[i].Param.getAs<Decl>()); 947 QualType ArgTy = Param->getType(); 948 assert(!ArgTy.isNull() && "Couldn't parse type?"); 949 950 // Adjust the parameter type. 951 assert((ArgTy == adjustParameterType(ArgTy)) && "Unadjusted type?"); 952 953 // Look for 'void'. void is allowed only as a single argument to a 954 // function with no other parameters (C99 6.7.5.3p10). We record 955 // int(void) as a FunctionProtoType with an empty argument list. 956 if (ArgTy->isVoidType()) { 957 // If this is something like 'float(int, void)', reject it. 'void' 958 // is an incomplete type (C99 6.2.5p19) and function decls cannot 959 // have arguments of incomplete type. 960 if (FTI.NumArgs != 1 || FTI.isVariadic) { 961 Diag(DeclType.Loc, diag::err_void_only_param); 962 ArgTy = Context.IntTy; 963 Param->setType(ArgTy); 964 } else if (FTI.ArgInfo[i].Ident) { 965 // Reject, but continue to parse 'int(void abc)'. 966 Diag(FTI.ArgInfo[i].IdentLoc, 967 diag::err_param_with_void_type); 968 ArgTy = Context.IntTy; 969 Param->setType(ArgTy); 970 } else { 971 // Reject, but continue to parse 'float(const void)'. 972 if (ArgTy.getCVRQualifiers()) 973 Diag(DeclType.Loc, diag::err_void_param_qualified); 974 975 // Do not add 'void' to the ArgTys list. 976 break; 977 } 978 } else if (!FTI.hasPrototype) { 979 if (ArgTy->isPromotableIntegerType()) { 980 ArgTy = Context.IntTy; 981 } else if (const BuiltinType* BTy = ArgTy->getAsBuiltinType()) { 982 if (BTy->getKind() == BuiltinType::Float) 983 ArgTy = Context.DoubleTy; 984 } 985 } 986 987 ArgTys.push_back(ArgTy); 988 } 989 990 llvm::SmallVector<QualType, 4> Exceptions; 991 Exceptions.reserve(FTI.NumExceptions); 992 for(unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) { 993 QualType ET = QualType::getFromOpaquePtr(FTI.Exceptions[ei].Ty); 994 // Check that the type is valid for an exception spec, and drop it if 995 // not. 996 if (!CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range)) 997 Exceptions.push_back(ET); 998 } 999 1000 T = Context.getFunctionType(T, ArgTys.data(), ArgTys.size(), 1001 FTI.isVariadic, FTI.TypeQuals, 1002 FTI.hasExceptionSpec, 1003 FTI.hasAnyExceptionSpec, 1004 Exceptions.size(), Exceptions.data()); 1005 } 1006 break; 1007 } 1008 case DeclaratorChunk::MemberPointer: 1009 // The scope spec must refer to a class, or be dependent. 1010 QualType ClsType; 1011 if (isDependentScopeSpecifier(DeclType.Mem.Scope())) { 1012 NestedNameSpecifier *NNS 1013 = (NestedNameSpecifier *)DeclType.Mem.Scope().getScopeRep(); 1014 assert(NNS->getAsType() && "Nested-name-specifier must name a type"); 1015 ClsType = QualType(NNS->getAsType(), 0); 1016 } else if (CXXRecordDecl *RD 1017 = dyn_cast_or_null<CXXRecordDecl>( 1018 computeDeclContext(DeclType.Mem.Scope()))) { 1019 ClsType = Context.getTagDeclType(RD); 1020 } else { 1021 Diag(DeclType.Mem.Scope().getBeginLoc(), 1022 diag::err_illegal_decl_mempointer_in_nonclass) 1023 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 1024 << DeclType.Mem.Scope().getRange(); 1025 D.setInvalidType(true); 1026 } 1027 1028 if (!ClsType.isNull()) 1029 T = BuildMemberPointerType(T, ClsType, DeclType.Mem.TypeQuals, 1030 DeclType.Loc, D.getIdentifier()); 1031 if (T.isNull()) { 1032 T = Context.IntTy; 1033 D.setInvalidType(true); 1034 } 1035 break; 1036 } 1037 1038 if (T.isNull()) { 1039 D.setInvalidType(true); 1040 T = Context.IntTy; 1041 } 1042 1043 // See if there are any attributes on this declarator chunk. 1044 if (const AttributeList *AL = DeclType.getAttrs()) 1045 ProcessTypeAttributeList(T, AL); 1046 } 1047 1048 if (getLangOptions().CPlusPlus && T->isFunctionType()) { 1049 const FunctionProtoType *FnTy = T->getAsFunctionProtoType(); 1050 assert(FnTy && "Why oh why is there not a FunctionProtoType here ?"); 1051 1052 // C++ 8.3.5p4: A cv-qualifier-seq shall only be part of the function type 1053 // for a nonstatic member function, the function type to which a pointer 1054 // to member refers, or the top-level function type of a function typedef 1055 // declaration. 1056 if (FnTy->getTypeQuals() != 0 && 1057 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 1058 ((D.getContext() != Declarator::MemberContext && 1059 (!D.getCXXScopeSpec().isSet() || 1060 !computeDeclContext(D.getCXXScopeSpec())->isRecord())) || 1061 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static)) { 1062 if (D.isFunctionDeclarator()) 1063 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_function_type); 1064 else 1065 Diag(D.getIdentifierLoc(), 1066 diag::err_invalid_qualified_typedef_function_type_use); 1067 1068 // Strip the cv-quals from the type. 1069 T = Context.getFunctionType(FnTy->getResultType(), FnTy->arg_type_begin(), 1070 FnTy->getNumArgs(), FnTy->isVariadic(), 0); 1071 } 1072 } 1073 1074 // If there were any type attributes applied to the decl itself (not the 1075 // type, apply the type attribute to the type!) 1076 if (const AttributeList *Attrs = D.getAttributes()) 1077 ProcessTypeAttributeList(T, Attrs); 1078 1079 return T; 1080} 1081 1082/// CheckSpecifiedExceptionType - Check if the given type is valid in an 1083/// exception specification. Incomplete types, or pointers to incomplete types 1084/// other than void are not allowed. 1085bool Sema::CheckSpecifiedExceptionType(QualType T, const SourceRange &Range) { 1086 // FIXME: This may not correctly work with the fix for core issue 437, 1087 // where a class's own type is considered complete within its body. 1088 1089 // C++ 15.4p2: A type denoted in an exception-specification shall not denote 1090 // an incomplete type. 1091 if (T->isIncompleteType()) 1092 return Diag(Range.getBegin(), diag::err_incomplete_in_exception_spec) 1093 << Range << T << /*direct*/0; 1094 1095 // C++ 15.4p2: A type denoted in an exception-specification shall not denote 1096 // an incomplete type a pointer or reference to an incomplete type, other 1097 // than (cv) void*. 1098 int kind; 1099 if (const PointerType* IT = T->getAsPointerType()) { 1100 T = IT->getPointeeType(); 1101 kind = 1; 1102 } else if (const ReferenceType* IT = T->getAsReferenceType()) { 1103 T = IT->getPointeeType(); 1104 kind = 2; 1105 } else 1106 return false; 1107 1108 if (T->isIncompleteType() && !T->isVoidType()) 1109 return Diag(Range.getBegin(), diag::err_incomplete_in_exception_spec) 1110 << Range << T << /*indirect*/kind; 1111 1112 return false; 1113} 1114 1115/// CheckDistantExceptionSpec - Check if the given type is a pointer or pointer 1116/// to member to a function with an exception specification. This means that 1117/// it is invalid to add another level of indirection. 1118bool Sema::CheckDistantExceptionSpec(QualType T) { 1119 if (const PointerType *PT = T->getAsPointerType()) 1120 T = PT->getPointeeType(); 1121 else if (const MemberPointerType *PT = T->getAsMemberPointerType()) 1122 T = PT->getPointeeType(); 1123 else 1124 return false; 1125 1126 const FunctionProtoType *FnT = T->getAsFunctionProtoType(); 1127 if (!FnT) 1128 return false; 1129 1130 return FnT->hasExceptionSpec(); 1131} 1132 1133/// ObjCGetTypeForMethodDefinition - Builds the type for a method definition 1134/// declarator 1135QualType Sema::ObjCGetTypeForMethodDefinition(DeclPtrTy D) { 1136 ObjCMethodDecl *MDecl = cast<ObjCMethodDecl>(D.getAs<Decl>()); 1137 QualType T = MDecl->getResultType(); 1138 llvm::SmallVector<QualType, 16> ArgTys; 1139 1140 // Add the first two invisible argument types for self and _cmd. 1141 if (MDecl->isInstanceMethod()) { 1142 QualType selfTy = Context.getObjCInterfaceType(MDecl->getClassInterface()); 1143 selfTy = Context.getPointerType(selfTy); 1144 ArgTys.push_back(selfTy); 1145 } else 1146 ArgTys.push_back(Context.getObjCIdType()); 1147 ArgTys.push_back(Context.getObjCSelType()); 1148 1149 for (ObjCMethodDecl::param_iterator PI = MDecl->param_begin(), 1150 E = MDecl->param_end(); PI != E; ++PI) { 1151 QualType ArgTy = (*PI)->getType(); 1152 assert(!ArgTy.isNull() && "Couldn't parse type?"); 1153 ArgTy = adjustParameterType(ArgTy); 1154 ArgTys.push_back(ArgTy); 1155 } 1156 T = Context.getFunctionType(T, &ArgTys[0], ArgTys.size(), 1157 MDecl->isVariadic(), 0); 1158 return T; 1159} 1160 1161/// UnwrapSimilarPointerTypes - If T1 and T2 are pointer types that 1162/// may be similar (C++ 4.4), replaces T1 and T2 with the type that 1163/// they point to and return true. If T1 and T2 aren't pointer types 1164/// or pointer-to-member types, or if they are not similar at this 1165/// level, returns false and leaves T1 and T2 unchanged. Top-level 1166/// qualifiers on T1 and T2 are ignored. This function will typically 1167/// be called in a loop that successively "unwraps" pointer and 1168/// pointer-to-member types to compare them at each level. 1169bool Sema::UnwrapSimilarPointerTypes(QualType& T1, QualType& T2) { 1170 const PointerType *T1PtrType = T1->getAsPointerType(), 1171 *T2PtrType = T2->getAsPointerType(); 1172 if (T1PtrType && T2PtrType) { 1173 T1 = T1PtrType->getPointeeType(); 1174 T2 = T2PtrType->getPointeeType(); 1175 return true; 1176 } 1177 1178 const MemberPointerType *T1MPType = T1->getAsMemberPointerType(), 1179 *T2MPType = T2->getAsMemberPointerType(); 1180 if (T1MPType && T2MPType && 1181 Context.getCanonicalType(T1MPType->getClass()) == 1182 Context.getCanonicalType(T2MPType->getClass())) { 1183 T1 = T1MPType->getPointeeType(); 1184 T2 = T2MPType->getPointeeType(); 1185 return true; 1186 } 1187 return false; 1188} 1189 1190Sema::TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 1191 // C99 6.7.6: Type names have no identifier. This is already validated by 1192 // the parser. 1193 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 1194 1195 TagDecl *OwnedTag = 0; 1196 QualType T = GetTypeForDeclarator(D, S, /*Skip=*/0, &OwnedTag); 1197 if (D.isInvalidType()) 1198 return true; 1199 1200 if (getLangOptions().CPlusPlus) { 1201 // Check that there are no default arguments (C++ only). 1202 CheckExtraCXXDefaultArguments(D); 1203 1204 // C++0x [dcl.type]p3: 1205 // A type-specifier-seq shall not define a class or enumeration 1206 // unless it appears in the type-id of an alias-declaration 1207 // (7.1.3). 1208 if (OwnedTag && OwnedTag->isDefinition()) 1209 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_type_specifier) 1210 << Context.getTypeDeclType(OwnedTag); 1211 } 1212 1213 return T.getAsOpaquePtr(); 1214} 1215 1216 1217 1218//===----------------------------------------------------------------------===// 1219// Type Attribute Processing 1220//===----------------------------------------------------------------------===// 1221 1222/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 1223/// specified type. The attribute contains 1 argument, the id of the address 1224/// space for the type. 1225static void HandleAddressSpaceTypeAttribute(QualType &Type, 1226 const AttributeList &Attr, Sema &S){ 1227 // If this type is already address space qualified, reject it. 1228 // Clause 6.7.3 - Type qualifiers: "No type shall be qualified by qualifiers 1229 // for two or more different address spaces." 1230 if (Type.getAddressSpace()) { 1231 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 1232 return; 1233 } 1234 1235 // Check the attribute arguments. 1236 if (Attr.getNumArgs() != 1) { 1237 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1238 return; 1239 } 1240 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 1241 llvm::APSInt addrSpace(32); 1242 if (!ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 1243 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 1244 << ASArgExpr->getSourceRange(); 1245 return; 1246 } 1247 1248 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 1249 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 1250} 1251 1252/// HandleObjCGCTypeAttribute - Process an objc's gc attribute on the 1253/// specified type. The attribute contains 1 argument, weak or strong. 1254static void HandleObjCGCTypeAttribute(QualType &Type, 1255 const AttributeList &Attr, Sema &S) { 1256 if (Type.getObjCGCAttr() != QualType::GCNone) { 1257 S.Diag(Attr.getLoc(), diag::err_attribute_multiple_objc_gc); 1258 return; 1259 } 1260 1261 // Check the attribute arguments. 1262 if (!Attr.getParameterName()) { 1263 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) 1264 << "objc_gc" << 1; 1265 return; 1266 } 1267 QualType::GCAttrTypes GCAttr; 1268 if (Attr.getNumArgs() != 0) { 1269 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1270 return; 1271 } 1272 if (Attr.getParameterName()->isStr("weak")) 1273 GCAttr = QualType::Weak; 1274 else if (Attr.getParameterName()->isStr("strong")) 1275 GCAttr = QualType::Strong; 1276 else { 1277 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported) 1278 << "objc_gc" << Attr.getParameterName(); 1279 return; 1280 } 1281 1282 Type = S.Context.getObjCGCQualType(Type, GCAttr); 1283} 1284 1285void Sema::ProcessTypeAttributeList(QualType &Result, const AttributeList *AL) { 1286 // Scan through and apply attributes to this type where it makes sense. Some 1287 // attributes (such as __address_space__, __vector_size__, etc) apply to the 1288 // type, but others can be present in the type specifiers even though they 1289 // apply to the decl. Here we apply type attributes and ignore the rest. 1290 for (; AL; AL = AL->getNext()) { 1291 // If this is an attribute we can handle, do so now, otherwise, add it to 1292 // the LeftOverAttrs list for rechaining. 1293 switch (AL->getKind()) { 1294 default: break; 1295 case AttributeList::AT_address_space: 1296 HandleAddressSpaceTypeAttribute(Result, *AL, *this); 1297 break; 1298 case AttributeList::AT_objc_gc: 1299 HandleObjCGCTypeAttribute(Result, *AL, *this); 1300 break; 1301 } 1302 } 1303} 1304 1305/// @brief Ensure that the type T is a complete type. 1306/// 1307/// This routine checks whether the type @p T is complete in any 1308/// context where a complete type is required. If @p T is a complete 1309/// type, returns false. If @p T is a class template specialization, 1310/// this routine then attempts to perform class template 1311/// instantiation. If instantiation fails, or if @p T is incomplete 1312/// and cannot be completed, issues the diagnostic @p diag (giving it 1313/// the type @p T) and returns true. 1314/// 1315/// @param Loc The location in the source that the incomplete type 1316/// diagnostic should refer to. 1317/// 1318/// @param T The type that this routine is examining for completeness. 1319/// 1320/// @param diag The diagnostic value (e.g., 1321/// @c diag::err_typecheck_decl_incomplete_type) that will be used 1322/// for the error message if @p T is incomplete. 1323/// 1324/// @param Range1 An optional range in the source code that will be a 1325/// part of the "incomplete type" error message. 1326/// 1327/// @param Range2 An optional range in the source code that will be a 1328/// part of the "incomplete type" error message. 1329/// 1330/// @param PrintType If non-NULL, the type that should be printed 1331/// instead of @p T. This parameter should be used when the type that 1332/// we're checking for incompleteness isn't the type that should be 1333/// displayed to the user, e.g., when T is a type and PrintType is a 1334/// pointer to T. 1335/// 1336/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 1337/// @c false otherwise. 1338bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, unsigned diag, 1339 SourceRange Range1, SourceRange Range2, 1340 QualType PrintType) { 1341 // FIXME: Add this assertion to help us flush out problems with 1342 // checking for dependent types and type-dependent expressions. 1343 // 1344 // assert(!T->isDependentType() && 1345 // "Can't ask whether a dependent type is complete"); 1346 1347 // If we have a complete type, we're done. 1348 if (!T->isIncompleteType()) 1349 return false; 1350 1351 // If we have a class template specialization or a class member of a 1352 // class template specialization, try to instantiate it. 1353 if (const RecordType *Record = T->getAsRecordType()) { 1354 if (ClassTemplateSpecializationDecl *ClassTemplateSpec 1355 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { 1356 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) { 1357 // Update the class template specialization's location to 1358 // refer to the point of instantiation. 1359 if (Loc.isValid()) 1360 ClassTemplateSpec->setLocation(Loc); 1361 return InstantiateClassTemplateSpecialization(ClassTemplateSpec, 1362 /*ExplicitInstantiation=*/false); 1363 } 1364 } else if (CXXRecordDecl *Rec 1365 = dyn_cast<CXXRecordDecl>(Record->getDecl())) { 1366 if (CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass()) { 1367 // Find the class template specialization that surrounds this 1368 // member class. 1369 ClassTemplateSpecializationDecl *Spec = 0; 1370 for (DeclContext *Parent = Rec->getDeclContext(); 1371 Parent && !Spec; Parent = Parent->getParent()) 1372 Spec = dyn_cast<ClassTemplateSpecializationDecl>(Parent); 1373 assert(Spec && "Not a member of a class template specialization?"); 1374 return InstantiateClass(Loc, Rec, Pattern, Spec->getTemplateArgs(), 1375 /*ExplicitInstantiation=*/false); 1376 } 1377 } 1378 } 1379 1380 if (PrintType.isNull()) 1381 PrintType = T; 1382 1383 // We have an incomplete type. Produce a diagnostic. 1384 Diag(Loc, diag) << PrintType << Range1 << Range2; 1385 1386 // If the type was a forward declaration of a class/struct/union 1387 // type, produce 1388 const TagType *Tag = 0; 1389 if (const RecordType *Record = T->getAsRecordType()) 1390 Tag = Record; 1391 else if (const EnumType *Enum = T->getAsEnumType()) 1392 Tag = Enum; 1393 1394 if (Tag && !Tag->getDecl()->isInvalidDecl()) 1395 Diag(Tag->getDecl()->getLocation(), 1396 Tag->isBeingDefined() ? diag::note_type_being_defined 1397 : diag::note_forward_declaration) 1398 << QualType(Tag, 0); 1399 1400 return true; 1401} 1402 1403/// \brief Retrieve a version of the type 'T' that is qualified by the 1404/// nested-name-specifier contained in SS. 1405QualType Sema::getQualifiedNameType(const CXXScopeSpec &SS, QualType T) { 1406 if (!SS.isSet() || SS.isInvalid() || T.isNull()) 1407 return T; 1408 1409 NestedNameSpecifier *NNS 1410 = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 1411 return Context.getQualifiedNameType(NNS, T); 1412} 1413