SemaType.cpp revision 14c3221c184cd7305ee9c7d4514caa5c13265b78
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/CXXInheritance.h" 17#include "clang/AST/DeclObjC.h" 18#include "clang/AST/DeclTemplate.h" 19#include "clang/AST/TypeLoc.h" 20#include "clang/AST/TypeLocVisitor.h" 21#include "clang/AST/Expr.h" 22#include "clang/Basic/PartialDiagnostic.h" 23#include "clang/Parse/DeclSpec.h" 24#include "llvm/ADT/SmallPtrSet.h" 25using namespace clang; 26 27/// \brief Perform adjustment on the parameter type of a function. 28/// 29/// This routine adjusts the given parameter type @p T to the actual 30/// parameter type used by semantic analysis (C99 6.7.5.3p[7,8], 31/// C++ [dcl.fct]p3). The adjusted parameter type is returned. 32QualType Sema::adjustParameterType(QualType T) { 33 // C99 6.7.5.3p7: 34 if (T->isArrayType()) { 35 // C99 6.7.5.3p7: 36 // A declaration of a parameter as "array of type" shall be 37 // adjusted to "qualified pointer to type", where the type 38 // qualifiers (if any) are those specified within the [ and ] of 39 // the array type derivation. 40 return Context.getArrayDecayedType(T); 41 } else if (T->isFunctionType()) 42 // C99 6.7.5.3p8: 43 // A declaration of a parameter as "function returning type" 44 // shall be adjusted to "pointer to function returning type", as 45 // in 6.3.2.1. 46 return Context.getPointerType(T); 47 48 return T; 49} 50 51/// \brief Convert the specified declspec to the appropriate type 52/// object. 53/// \param DS the declaration specifiers 54/// \param DeclLoc The location of the declarator identifier or invalid if none. 55/// \param SourceTy QualType representing the type as written in source form. 56/// \returns The type described by the declaration specifiers. This function 57/// never returns null. 58QualType Sema::ConvertDeclSpecToType(const DeclSpec &DS, 59 SourceLocation DeclLoc, 60 bool &isInvalid, QualType &SourceTy) { 61 // FIXME: Should move the logic from DeclSpec::Finish to here for validity 62 // checking. 63 QualType Result; 64 SourceTy = Result; 65 66 switch (DS.getTypeSpecType()) { 67 case DeclSpec::TST_void: 68 Result = Context.VoidTy; 69 break; 70 case DeclSpec::TST_char: 71 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 72 Result = Context.CharTy; 73 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) 74 Result = Context.SignedCharTy; 75 else { 76 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 77 "Unknown TSS value"); 78 Result = Context.UnsignedCharTy; 79 } 80 break; 81 case DeclSpec::TST_wchar: 82 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 83 Result = Context.WCharTy; 84 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) { 85 Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 86 << DS.getSpecifierName(DS.getTypeSpecType()); 87 Result = Context.getSignedWCharType(); 88 } else { 89 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 90 "Unknown TSS value"); 91 Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 92 << DS.getSpecifierName(DS.getTypeSpecType()); 93 Result = Context.getUnsignedWCharType(); 94 } 95 break; 96 case DeclSpec::TST_char16: 97 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 98 "Unknown TSS value"); 99 Result = Context.Char16Ty; 100 break; 101 case DeclSpec::TST_char32: 102 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 103 "Unknown TSS value"); 104 Result = Context.Char32Ty; 105 break; 106 case DeclSpec::TST_unspecified: 107 // "<proto1,proto2>" is an objc qualified ID with a missing id. 108 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 109 SourceTy = Context.getObjCProtocolListType(QualType(), 110 (ObjCProtocolDecl**)PQ, 111 DS.getNumProtocolQualifiers()); 112 Result = Context.getObjCObjectPointerType(Context.ObjCBuiltinIdTy, 113 (ObjCProtocolDecl**)PQ, 114 DS.getNumProtocolQualifiers()); 115 break; 116 } 117 118 // Unspecified typespec defaults to int in C90. However, the C90 grammar 119 // [C90 6.5] only allows a decl-spec if there was *some* type-specifier, 120 // type-qualifier, or storage-class-specifier. If not, emit an extwarn. 121 // Note that the one exception to this is function definitions, which are 122 // allowed to be completely missing a declspec. This is handled in the 123 // parser already though by it pretending to have seen an 'int' in this 124 // case. 125 if (getLangOptions().ImplicitInt) { 126 // In C89 mode, we only warn if there is a completely missing declspec 127 // when one is not allowed. 128 if (DS.isEmpty()) { 129 if (DeclLoc.isInvalid()) 130 DeclLoc = DS.getSourceRange().getBegin(); 131 Diag(DeclLoc, diag::ext_missing_declspec) 132 << DS.getSourceRange() 133 << CodeModificationHint::CreateInsertion(DS.getSourceRange().getBegin(), 134 "int"); 135 } 136 } else if (!DS.hasTypeSpecifier()) { 137 // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says: 138 // "At least one type specifier shall be given in the declaration 139 // specifiers in each declaration, and in the specifier-qualifier list in 140 // each struct declaration and type name." 141 // FIXME: Does Microsoft really have the implicit int extension in C++? 142 if (DeclLoc.isInvalid()) 143 DeclLoc = DS.getSourceRange().getBegin(); 144 145 if (getLangOptions().CPlusPlus && !getLangOptions().Microsoft) { 146 Diag(DeclLoc, diag::err_missing_type_specifier) 147 << DS.getSourceRange(); 148 149 // When this occurs in C++ code, often something is very broken with the 150 // value being declared, poison it as invalid so we don't get chains of 151 // errors. 152 isInvalid = true; 153 } else { 154 Diag(DeclLoc, diag::ext_missing_type_specifier) 155 << DS.getSourceRange(); 156 } 157 } 158 159 // FALL THROUGH. 160 case DeclSpec::TST_int: { 161 if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) { 162 switch (DS.getTypeSpecWidth()) { 163 case DeclSpec::TSW_unspecified: Result = Context.IntTy; break; 164 case DeclSpec::TSW_short: Result = Context.ShortTy; break; 165 case DeclSpec::TSW_long: Result = Context.LongTy; break; 166 case DeclSpec::TSW_longlong: Result = Context.LongLongTy; break; 167 } 168 } else { 169 switch (DS.getTypeSpecWidth()) { 170 case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break; 171 case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break; 172 case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break; 173 case DeclSpec::TSW_longlong: Result =Context.UnsignedLongLongTy; break; 174 } 175 } 176 break; 177 } 178 case DeclSpec::TST_float: Result = Context.FloatTy; break; 179 case DeclSpec::TST_double: 180 if (DS.getTypeSpecWidth() == DeclSpec::TSW_long) 181 Result = Context.LongDoubleTy; 182 else 183 Result = Context.DoubleTy; 184 break; 185 case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool 186 case DeclSpec::TST_decimal32: // _Decimal32 187 case DeclSpec::TST_decimal64: // _Decimal64 188 case DeclSpec::TST_decimal128: // _Decimal128 189 Diag(DS.getTypeSpecTypeLoc(), diag::err_decimal_unsupported); 190 Result = Context.IntTy; 191 isInvalid = true; 192 break; 193 case DeclSpec::TST_class: 194 case DeclSpec::TST_enum: 195 case DeclSpec::TST_union: 196 case DeclSpec::TST_struct: { 197 Decl *D = static_cast<Decl *>(DS.getTypeRep()); 198 if (!D) { 199 // This can happen in C++ with ambiguous lookups. 200 Result = Context.IntTy; 201 isInvalid = true; 202 break; 203 } 204 205 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 206 DS.getTypeSpecSign() == 0 && 207 "Can't handle qualifiers on typedef names yet!"); 208 // TypeQuals handled by caller. 209 Result = Context.getTypeDeclType(cast<TypeDecl>(D)); 210 211 // In C++, make an ElaboratedType. 212 if (getLangOptions().CPlusPlus) { 213 TagDecl::TagKind Tag 214 = TagDecl::getTagKindForTypeSpec(DS.getTypeSpecType()); 215 Result = Context.getElaboratedType(Result, Tag); 216 } 217 218 if (D->isInvalidDecl()) 219 isInvalid = true; 220 break; 221 } 222 case DeclSpec::TST_typename: { 223 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 224 DS.getTypeSpecSign() == 0 && 225 "Can't handle qualifiers on typedef names yet!"); 226 Result = GetTypeFromParser(DS.getTypeRep()); 227 228 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 229 SourceTy = Context.getObjCProtocolListType(Result, 230 (ObjCProtocolDecl**)PQ, 231 DS.getNumProtocolQualifiers()); 232 if (const ObjCInterfaceType * 233 Interface = Result->getAs<ObjCInterfaceType>()) { 234 // It would be nice if protocol qualifiers were only stored with the 235 // ObjCObjectPointerType. Unfortunately, this isn't possible due 236 // to the following typedef idiom (which is uncommon, but allowed): 237 // 238 // typedef Foo<P> T; 239 // static void func() { 240 // Foo<P> *yy; 241 // T *zz; 242 // } 243 Result = Context.getObjCInterfaceType(Interface->getDecl(), 244 (ObjCProtocolDecl**)PQ, 245 DS.getNumProtocolQualifiers()); 246 } else if (Result->isObjCIdType()) 247 // id<protocol-list> 248 Result = Context.getObjCObjectPointerType(Context.ObjCBuiltinIdTy, 249 (ObjCProtocolDecl**)PQ, DS.getNumProtocolQualifiers()); 250 else if (Result->isObjCClassType()) { 251 if (DeclLoc.isInvalid()) 252 DeclLoc = DS.getSourceRange().getBegin(); 253 // Class<protocol-list> 254 Result = Context.getObjCObjectPointerType(Context.ObjCBuiltinClassTy, 255 (ObjCProtocolDecl**)PQ, DS.getNumProtocolQualifiers()); 256 } else { 257 if (DeclLoc.isInvalid()) 258 DeclLoc = DS.getSourceRange().getBegin(); 259 Diag(DeclLoc, diag::err_invalid_protocol_qualifiers) 260 << DS.getSourceRange(); 261 isInvalid = true; 262 } 263 } 264 265 // If this is a reference to an invalid typedef, propagate the invalidity. 266 if (TypedefType *TDT = dyn_cast<TypedefType>(Result)) 267 if (TDT->getDecl()->isInvalidDecl()) 268 isInvalid = true; 269 270 // TypeQuals handled by caller. 271 break; 272 } 273 case DeclSpec::TST_typeofType: 274 // FIXME: Preserve type source info. 275 Result = GetTypeFromParser(DS.getTypeRep()); 276 assert(!Result.isNull() && "Didn't get a type for typeof?"); 277 // TypeQuals handled by caller. 278 Result = Context.getTypeOfType(Result); 279 break; 280 case DeclSpec::TST_typeofExpr: { 281 Expr *E = static_cast<Expr *>(DS.getTypeRep()); 282 assert(E && "Didn't get an expression for typeof?"); 283 // TypeQuals handled by caller. 284 Result = Context.getTypeOfExprType(E); 285 break; 286 } 287 case DeclSpec::TST_decltype: { 288 Expr *E = static_cast<Expr *>(DS.getTypeRep()); 289 assert(E && "Didn't get an expression for decltype?"); 290 // TypeQuals handled by caller. 291 Result = BuildDecltypeType(E); 292 if (Result.isNull()) { 293 Result = Context.IntTy; 294 isInvalid = true; 295 } 296 break; 297 } 298 case DeclSpec::TST_auto: { 299 // TypeQuals handled by caller. 300 Result = Context.UndeducedAutoTy; 301 break; 302 } 303 304 case DeclSpec::TST_error: 305 Result = Context.IntTy; 306 isInvalid = true; 307 break; 308 } 309 310 // Handle complex types. 311 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) { 312 if (getLangOptions().Freestanding) 313 Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex); 314 Result = Context.getComplexType(Result); 315 } 316 317 assert(DS.getTypeSpecComplex() != DeclSpec::TSC_imaginary && 318 "FIXME: imaginary types not supported yet!"); 319 320 // See if there are any attributes on the declspec that apply to the type (as 321 // opposed to the decl). 322 if (const AttributeList *AL = DS.getAttributes()) 323 ProcessTypeAttributeList(Result, AL); 324 325 // Apply const/volatile/restrict qualifiers to T. 326 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 327 328 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 329 // or incomplete types shall not be restrict-qualified." C++ also allows 330 // restrict-qualified references. 331 if (TypeQuals & DeclSpec::TQ_restrict) { 332 if (Result->isPointerType() || Result->isReferenceType()) { 333 QualType EltTy = Result->isPointerType() ? 334 Result->getAs<PointerType>()->getPointeeType() : 335 Result->getAs<ReferenceType>()->getPointeeType(); 336 337 // If we have a pointer or reference, the pointee must have an object 338 // incomplete type. 339 if (!EltTy->isIncompleteOrObjectType()) { 340 Diag(DS.getRestrictSpecLoc(), 341 diag::err_typecheck_invalid_restrict_invalid_pointee) 342 << EltTy << DS.getSourceRange(); 343 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 344 } 345 } else { 346 Diag(DS.getRestrictSpecLoc(), 347 diag::err_typecheck_invalid_restrict_not_pointer) 348 << Result << DS.getSourceRange(); 349 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 350 } 351 } 352 353 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification 354 // of a function type includes any type qualifiers, the behavior is 355 // undefined." 356 if (Result->isFunctionType() && TypeQuals) { 357 // Get some location to point at, either the C or V location. 358 SourceLocation Loc; 359 if (TypeQuals & DeclSpec::TQ_const) 360 Loc = DS.getConstSpecLoc(); 361 else if (TypeQuals & DeclSpec::TQ_volatile) 362 Loc = DS.getVolatileSpecLoc(); 363 else { 364 assert((TypeQuals & DeclSpec::TQ_restrict) && 365 "Has CVR quals but not C, V, or R?"); 366 Loc = DS.getRestrictSpecLoc(); 367 } 368 Diag(Loc, diag::warn_typecheck_function_qualifiers) 369 << Result << DS.getSourceRange(); 370 } 371 372 // C++ [dcl.ref]p1: 373 // Cv-qualified references are ill-formed except when the 374 // cv-qualifiers are introduced through the use of a typedef 375 // (7.1.3) or of a template type argument (14.3), in which 376 // case the cv-qualifiers are ignored. 377 // FIXME: Shouldn't we be checking SCS_typedef here? 378 if (DS.getTypeSpecType() == DeclSpec::TST_typename && 379 TypeQuals && Result->isReferenceType()) { 380 TypeQuals &= ~DeclSpec::TQ_const; 381 TypeQuals &= ~DeclSpec::TQ_volatile; 382 } 383 384 Qualifiers Quals = Qualifiers::fromCVRMask(TypeQuals); 385 Result = Context.getQualifiedType(Result, Quals); 386 } 387 388 if (SourceTy.isNull()) 389 SourceTy = Result; 390 return Result; 391} 392 393static std::string getPrintableNameForEntity(DeclarationName Entity) { 394 if (Entity) 395 return Entity.getAsString(); 396 397 return "type name"; 398} 399 400/// \brief Build a pointer type. 401/// 402/// \param T The type to which we'll be building a pointer. 403/// 404/// \param Quals The cvr-qualifiers to be applied to the pointer type. 405/// 406/// \param Loc The location of the entity whose type involves this 407/// pointer type or, if there is no such entity, the location of the 408/// type that will have pointer type. 409/// 410/// \param Entity The name of the entity that involves the pointer 411/// type, if known. 412/// 413/// \returns A suitable pointer type, if there are no 414/// errors. Otherwise, returns a NULL type. 415QualType Sema::BuildPointerType(QualType T, unsigned Quals, 416 SourceLocation Loc, DeclarationName Entity) { 417 if (T->isReferenceType()) { 418 // C++ 8.3.2p4: There shall be no ... pointers to references ... 419 Diag(Loc, diag::err_illegal_decl_pointer_to_reference) 420 << getPrintableNameForEntity(Entity); 421 return QualType(); 422 } 423 424 Qualifiers Qs = Qualifiers::fromCVRMask(Quals); 425 426 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 427 // object or incomplete types shall not be restrict-qualified." 428 if (Qs.hasRestrict() && !T->isIncompleteOrObjectType()) { 429 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 430 << T; 431 Qs.removeRestrict(); 432 } 433 434 // Build the pointer type. 435 return Context.getQualifiedType(Context.getPointerType(T), Qs); 436} 437 438/// \brief Build a reference type. 439/// 440/// \param T The type to which we'll be building a reference. 441/// 442/// \param CVR The cvr-qualifiers to be applied to the reference type. 443/// 444/// \param Loc The location of the entity whose type involves this 445/// reference type or, if there is no such entity, the location of the 446/// type that will have reference type. 447/// 448/// \param Entity The name of the entity that involves the reference 449/// type, if known. 450/// 451/// \returns A suitable reference type, if there are no 452/// errors. Otherwise, returns a NULL type. 453QualType Sema::BuildReferenceType(QualType T, bool LValueRef, unsigned CVR, 454 SourceLocation Loc, DeclarationName Entity) { 455 Qualifiers Quals = Qualifiers::fromCVRMask(CVR); 456 if (LValueRef) { 457 if (const RValueReferenceType *R = T->getAs<RValueReferenceType>()) { 458 // C++0x [dcl.typedef]p9: If a typedef TD names a type that is a 459 // reference to a type T, and attempt to create the type "lvalue 460 // reference to cv TD" creates the type "lvalue reference to T". 461 // We use the qualifiers (restrict or none) of the original reference, 462 // not the new ones. This is consistent with GCC. 463 QualType LVRT = Context.getLValueReferenceType(R->getPointeeType()); 464 return Context.getQualifiedType(LVRT, T.getQualifiers()); 465 } 466 } 467 if (T->isReferenceType()) { 468 // C++ [dcl.ref]p4: There shall be no references to references. 469 // 470 // According to C++ DR 106, references to references are only 471 // diagnosed when they are written directly (e.g., "int & &"), 472 // but not when they happen via a typedef: 473 // 474 // typedef int& intref; 475 // typedef intref& intref2; 476 // 477 // Parser::ParseDeclaratorInternal diagnoses the case where 478 // references are written directly; here, we handle the 479 // collapsing of references-to-references as described in C++ 480 // DR 106 and amended by C++ DR 540. 481 return T; 482 } 483 484 // C++ [dcl.ref]p1: 485 // A declarator that specifies the type "reference to cv void" 486 // is ill-formed. 487 if (T->isVoidType()) { 488 Diag(Loc, diag::err_reference_to_void); 489 return QualType(); 490 } 491 492 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 493 // object or incomplete types shall not be restrict-qualified." 494 if (Quals.hasRestrict() && !T->isIncompleteOrObjectType()) { 495 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 496 << T; 497 Quals.removeRestrict(); 498 } 499 500 // C++ [dcl.ref]p1: 501 // [...] Cv-qualified references are ill-formed except when the 502 // cv-qualifiers are introduced through the use of a typedef 503 // (7.1.3) or of a template type argument (14.3), in which case 504 // the cv-qualifiers are ignored. 505 // 506 // We diagnose extraneous cv-qualifiers for the non-typedef, 507 // non-template type argument case within the parser. Here, we just 508 // ignore any extraneous cv-qualifiers. 509 Quals.removeConst(); 510 Quals.removeVolatile(); 511 512 // Handle restrict on references. 513 if (LValueRef) 514 return Context.getQualifiedType(Context.getLValueReferenceType(T), Quals); 515 return Context.getQualifiedType(Context.getRValueReferenceType(T), Quals); 516} 517 518/// \brief Build an array type. 519/// 520/// \param T The type of each element in the array. 521/// 522/// \param ASM C99 array size modifier (e.g., '*', 'static'). 523/// 524/// \param ArraySize Expression describing the size of the array. 525/// 526/// \param Quals The cvr-qualifiers to be applied to the array's 527/// element type. 528/// 529/// \param Loc The location of the entity whose type involves this 530/// array type or, if there is no such entity, the location of the 531/// type that will have array type. 532/// 533/// \param Entity The name of the entity that involves the array 534/// type, if known. 535/// 536/// \returns A suitable array type, if there are no errors. Otherwise, 537/// returns a NULL type. 538QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM, 539 Expr *ArraySize, unsigned Quals, 540 SourceRange Brackets, DeclarationName Entity) { 541 542 SourceLocation Loc = Brackets.getBegin(); 543 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 544 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 545 if (RequireCompleteType(Loc, T, 546 diag::err_illegal_decl_array_incomplete_type)) 547 return QualType(); 548 549 if (T->isFunctionType()) { 550 Diag(Loc, diag::err_illegal_decl_array_of_functions) 551 << getPrintableNameForEntity(Entity); 552 return QualType(); 553 } 554 555 // C++ 8.3.2p4: There shall be no ... arrays of references ... 556 if (T->isReferenceType()) { 557 Diag(Loc, diag::err_illegal_decl_array_of_references) 558 << getPrintableNameForEntity(Entity); 559 return QualType(); 560 } 561 562 if (Context.getCanonicalType(T) == Context.UndeducedAutoTy) { 563 Diag(Loc, diag::err_illegal_decl_array_of_auto) 564 << getPrintableNameForEntity(Entity); 565 return QualType(); 566 } 567 568 if (const RecordType *EltTy = T->getAs<RecordType>()) { 569 // If the element type is a struct or union that contains a variadic 570 // array, accept it as a GNU extension: C99 6.7.2.1p2. 571 if (EltTy->getDecl()->hasFlexibleArrayMember()) 572 Diag(Loc, diag::ext_flexible_array_in_array) << T; 573 } else if (T->isObjCInterfaceType()) { 574 Diag(Loc, diag::err_objc_array_of_interfaces) << T; 575 return QualType(); 576 } 577 578 // C99 6.7.5.2p1: The size expression shall have integer type. 579 if (ArraySize && !ArraySize->isTypeDependent() && 580 !ArraySize->getType()->isIntegerType()) { 581 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 582 << ArraySize->getType() << ArraySize->getSourceRange(); 583 ArraySize->Destroy(Context); 584 return QualType(); 585 } 586 llvm::APSInt ConstVal(32); 587 if (!ArraySize) { 588 if (ASM == ArrayType::Star) 589 T = Context.getVariableArrayType(T, 0, ASM, Quals, Brackets); 590 else 591 T = Context.getIncompleteArrayType(T, ASM, Quals); 592 } else if (ArraySize->isValueDependent()) { 593 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets); 594 } else if (!ArraySize->isIntegerConstantExpr(ConstVal, Context) || 595 (!T->isDependentType() && !T->isConstantSizeType())) { 596 // Per C99, a variable array is an array with either a non-constant 597 // size or an element type that has a non-constant-size 598 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets); 599 } else { 600 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 601 // have a value greater than zero. 602 if (ConstVal.isSigned()) { 603 if (ConstVal.isNegative()) { 604 Diag(ArraySize->getLocStart(), 605 diag::err_typecheck_negative_array_size) 606 << ArraySize->getSourceRange(); 607 return QualType(); 608 } else if (ConstVal == 0) { 609 // GCC accepts zero sized static arrays. 610 Diag(ArraySize->getLocStart(), diag::ext_typecheck_zero_array_size) 611 << ArraySize->getSourceRange(); 612 } 613 } 614 T = Context.getConstantArrayType(T, ConstVal, ASM, Quals); 615 } 616 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 617 if (!getLangOptions().C99) { 618 if (ArraySize && !ArraySize->isTypeDependent() && 619 !ArraySize->isValueDependent() && 620 !ArraySize->isIntegerConstantExpr(Context)) 621 Diag(Loc, getLangOptions().CPlusPlus? diag::err_vla_cxx : diag::ext_vla); 622 else if (ASM != ArrayType::Normal || Quals != 0) 623 Diag(Loc, 624 getLangOptions().CPlusPlus? diag::err_c99_array_usage_cxx 625 : diag::ext_c99_array_usage); 626 } 627 628 return T; 629} 630 631/// \brief Build an ext-vector type. 632/// 633/// Run the required checks for the extended vector type. 634QualType Sema::BuildExtVectorType(QualType T, ExprArg ArraySize, 635 SourceLocation AttrLoc) { 636 637 Expr *Arg = (Expr *)ArraySize.get(); 638 639 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 640 // in conjunction with complex types (pointers, arrays, functions, etc.). 641 if (!T->isDependentType() && 642 !T->isIntegerType() && !T->isRealFloatingType()) { 643 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T; 644 return QualType(); 645 } 646 647 if (!Arg->isTypeDependent() && !Arg->isValueDependent()) { 648 llvm::APSInt vecSize(32); 649 if (!Arg->isIntegerConstantExpr(vecSize, Context)) { 650 Diag(AttrLoc, diag::err_attribute_argument_not_int) 651 << "ext_vector_type" << Arg->getSourceRange(); 652 return QualType(); 653 } 654 655 // unlike gcc's vector_size attribute, the size is specified as the 656 // number of elements, not the number of bytes. 657 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 658 659 if (vectorSize == 0) { 660 Diag(AttrLoc, diag::err_attribute_zero_size) 661 << Arg->getSourceRange(); 662 return QualType(); 663 } 664 665 if (!T->isDependentType()) 666 return Context.getExtVectorType(T, vectorSize); 667 } 668 669 return Context.getDependentSizedExtVectorType(T, ArraySize.takeAs<Expr>(), 670 AttrLoc); 671} 672 673/// \brief Build a function type. 674/// 675/// This routine checks the function type according to C++ rules and 676/// under the assumption that the result type and parameter types have 677/// just been instantiated from a template. It therefore duplicates 678/// some of the behavior of GetTypeForDeclarator, but in a much 679/// simpler form that is only suitable for this narrow use case. 680/// 681/// \param T The return type of the function. 682/// 683/// \param ParamTypes The parameter types of the function. This array 684/// will be modified to account for adjustments to the types of the 685/// function parameters. 686/// 687/// \param NumParamTypes The number of parameter types in ParamTypes. 688/// 689/// \param Variadic Whether this is a variadic function type. 690/// 691/// \param Quals The cvr-qualifiers to be applied to the function type. 692/// 693/// \param Loc The location of the entity whose type involves this 694/// function type or, if there is no such entity, the location of the 695/// type that will have function type. 696/// 697/// \param Entity The name of the entity that involves the function 698/// type, if known. 699/// 700/// \returns A suitable function type, if there are no 701/// errors. Otherwise, returns a NULL type. 702QualType Sema::BuildFunctionType(QualType T, 703 QualType *ParamTypes, 704 unsigned NumParamTypes, 705 bool Variadic, unsigned Quals, 706 SourceLocation Loc, DeclarationName Entity) { 707 if (T->isArrayType() || T->isFunctionType()) { 708 Diag(Loc, diag::err_func_returning_array_function) << T; 709 return QualType(); 710 } 711 712 bool Invalid = false; 713 for (unsigned Idx = 0; Idx < NumParamTypes; ++Idx) { 714 QualType ParamType = adjustParameterType(ParamTypes[Idx]); 715 if (ParamType->isVoidType()) { 716 Diag(Loc, diag::err_param_with_void_type); 717 Invalid = true; 718 } 719 720 ParamTypes[Idx] = adjustFunctionParamType(ParamType); 721 } 722 723 if (Invalid) 724 return QualType(); 725 726 return Context.getFunctionType(T, ParamTypes, NumParamTypes, Variadic, 727 Quals); 728} 729 730/// \brief Build a member pointer type \c T Class::*. 731/// 732/// \param T the type to which the member pointer refers. 733/// \param Class the class type into which the member pointer points. 734/// \param CVR Qualifiers applied to the member pointer type 735/// \param Loc the location where this type begins 736/// \param Entity the name of the entity that will have this member pointer type 737/// 738/// \returns a member pointer type, if successful, or a NULL type if there was 739/// an error. 740QualType Sema::BuildMemberPointerType(QualType T, QualType Class, 741 unsigned CVR, SourceLocation Loc, 742 DeclarationName Entity) { 743 Qualifiers Quals = Qualifiers::fromCVRMask(CVR); 744 745 // Verify that we're not building a pointer to pointer to function with 746 // exception specification. 747 if (CheckDistantExceptionSpec(T)) { 748 Diag(Loc, diag::err_distant_exception_spec); 749 750 // FIXME: If we're doing this as part of template instantiation, 751 // we should return immediately. 752 753 // Build the type anyway, but use the canonical type so that the 754 // exception specifiers are stripped off. 755 T = Context.getCanonicalType(T); 756 } 757 758 // C++ 8.3.3p3: A pointer to member shall not pointer to ... a member 759 // with reference type, or "cv void." 760 if (T->isReferenceType()) { 761 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference) 762 << (Entity? Entity.getAsString() : "type name"); 763 return QualType(); 764 } 765 766 if (T->isVoidType()) { 767 Diag(Loc, diag::err_illegal_decl_mempointer_to_void) 768 << (Entity? Entity.getAsString() : "type name"); 769 return QualType(); 770 } 771 772 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 773 // object or incomplete types shall not be restrict-qualified." 774 if (Quals.hasRestrict() && !T->isIncompleteOrObjectType()) { 775 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 776 << T; 777 778 // FIXME: If we're doing this as part of template instantiation, 779 // we should return immediately. 780 Quals.removeRestrict(); 781 } 782 783 if (!Class->isDependentType() && !Class->isRecordType()) { 784 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class; 785 return QualType(); 786 } 787 788 return Context.getQualifiedType( 789 Context.getMemberPointerType(T, Class.getTypePtr()), Quals); 790} 791 792/// \brief Build a block pointer type. 793/// 794/// \param T The type to which we'll be building a block pointer. 795/// 796/// \param CVR The cvr-qualifiers to be applied to the block pointer type. 797/// 798/// \param Loc The location of the entity whose type involves this 799/// block pointer type or, if there is no such entity, the location of the 800/// type that will have block pointer type. 801/// 802/// \param Entity The name of the entity that involves the block pointer 803/// type, if known. 804/// 805/// \returns A suitable block pointer type, if there are no 806/// errors. Otherwise, returns a NULL type. 807QualType Sema::BuildBlockPointerType(QualType T, unsigned CVR, 808 SourceLocation Loc, 809 DeclarationName Entity) { 810 if (!T->isFunctionType()) { 811 Diag(Loc, diag::err_nonfunction_block_type); 812 return QualType(); 813 } 814 815 Qualifiers Quals = Qualifiers::fromCVRMask(CVR); 816 return Context.getQualifiedType(Context.getBlockPointerType(T), Quals); 817} 818 819QualType Sema::GetTypeFromParser(TypeTy *Ty, DeclaratorInfo **DInfo) { 820 QualType QT = QualType::getFromOpaquePtr(Ty); 821 DeclaratorInfo *DI = 0; 822 if (LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) { 823 QT = LIT->getType(); 824 DI = LIT->getDeclaratorInfo(); 825 } 826 827 if (DInfo) *DInfo = DI; 828 return QT; 829} 830 831/// GetTypeForDeclarator - Convert the type for the specified 832/// declarator to Type instances. Skip the outermost Skip type 833/// objects. 834/// 835/// If OwnedDecl is non-NULL, and this declarator's decl-specifier-seq 836/// owns the declaration of a type (e.g., the definition of a struct 837/// type), then *OwnedDecl will receive the owned declaration. 838QualType Sema::GetTypeForDeclarator(Declarator &D, Scope *S, 839 DeclaratorInfo **DInfo, unsigned Skip, 840 TagDecl **OwnedDecl) { 841 bool OmittedReturnType = false; 842 843 if (D.getContext() == Declarator::BlockLiteralContext 844 && Skip == 0 845 && !D.getDeclSpec().hasTypeSpecifier() 846 && (D.getNumTypeObjects() == 0 847 || (D.getNumTypeObjects() == 1 848 && D.getTypeObject(0).Kind == DeclaratorChunk::Function))) 849 OmittedReturnType = true; 850 851 // long long is a C99 feature. 852 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 853 D.getDeclSpec().getTypeSpecWidth() == DeclSpec::TSW_longlong) 854 Diag(D.getDeclSpec().getTypeSpecWidthLoc(), diag::ext_longlong); 855 856 // Determine the type of the declarator. Not all forms of declarator 857 // have a type. 858 QualType T; 859 // The QualType referring to the type as written in source code. We can't use 860 // T because it can change due to semantic analysis. 861 QualType SourceTy; 862 863 switch (D.getKind()) { 864 case Declarator::DK_Abstract: 865 case Declarator::DK_Normal: 866 case Declarator::DK_Operator: 867 case Declarator::DK_TemplateId: { 868 const DeclSpec &DS = D.getDeclSpec(); 869 if (OmittedReturnType) { 870 // We default to a dependent type initially. Can be modified by 871 // the first return statement. 872 T = Context.DependentTy; 873 } else { 874 bool isInvalid = false; 875 T = ConvertDeclSpecToType(DS, D.getIdentifierLoc(), isInvalid, SourceTy); 876 if (isInvalid) 877 D.setInvalidType(true); 878 else if (OwnedDecl && DS.isTypeSpecOwned()) 879 *OwnedDecl = cast<TagDecl>((Decl *)DS.getTypeRep()); 880 } 881 break; 882 } 883 884 case Declarator::DK_Constructor: 885 case Declarator::DK_Destructor: 886 case Declarator::DK_Conversion: 887 // Constructors and destructors don't have return types. Use 888 // "void" instead. Conversion operators will check their return 889 // types separately. 890 T = Context.VoidTy; 891 break; 892 } 893 894 if (SourceTy.isNull()) 895 SourceTy = T; 896 897 if (T == Context.UndeducedAutoTy) { 898 int Error = -1; 899 900 switch (D.getContext()) { 901 case Declarator::KNRTypeListContext: 902 assert(0 && "K&R type lists aren't allowed in C++"); 903 break; 904 case Declarator::PrototypeContext: 905 Error = 0; // Function prototype 906 break; 907 case Declarator::MemberContext: 908 switch (cast<TagDecl>(CurContext)->getTagKind()) { 909 case TagDecl::TK_enum: assert(0 && "unhandled tag kind"); break; 910 case TagDecl::TK_struct: Error = 1; /* Struct member */ break; 911 case TagDecl::TK_union: Error = 2; /* Union member */ break; 912 case TagDecl::TK_class: Error = 3; /* Class member */ break; 913 } 914 break; 915 case Declarator::CXXCatchContext: 916 Error = 4; // Exception declaration 917 break; 918 case Declarator::TemplateParamContext: 919 Error = 5; // Template parameter 920 break; 921 case Declarator::BlockLiteralContext: 922 Error = 6; // Block literal 923 break; 924 case Declarator::FileContext: 925 case Declarator::BlockContext: 926 case Declarator::ForContext: 927 case Declarator::ConditionContext: 928 case Declarator::TypeNameContext: 929 break; 930 } 931 932 if (Error != -1) { 933 Diag(D.getDeclSpec().getTypeSpecTypeLoc(), diag::err_auto_not_allowed) 934 << Error; 935 T = Context.IntTy; 936 D.setInvalidType(true); 937 } 938 } 939 940 // The name we're declaring, if any. 941 DeclarationName Name; 942 if (D.getIdentifier()) 943 Name = D.getIdentifier(); 944 945 bool ShouldBuildInfo = DInfo != 0; 946 947 // Walk the DeclTypeInfo, building the recursive type as we go. 948 // DeclTypeInfos are ordered from the identifier out, which is 949 // opposite of what we want :). 950 for (unsigned i = Skip, e = D.getNumTypeObjects(); i != e; ++i) { 951 DeclaratorChunk &DeclType = D.getTypeObject(e-i-1+Skip); 952 switch (DeclType.Kind) { 953 default: assert(0 && "Unknown decltype!"); 954 case DeclaratorChunk::BlockPointer: 955 if (ShouldBuildInfo) { 956 if (SourceTy->isFunctionType()) 957 SourceTy 958 = Context.getQualifiedType(Context.getBlockPointerType(SourceTy), 959 Qualifiers::fromCVRMask(DeclType.Cls.TypeQuals)); 960 else 961 // If not function type Context::getBlockPointerType asserts, 962 // so just give up. 963 ShouldBuildInfo = false; 964 } 965 966 // If blocks are disabled, emit an error. 967 if (!LangOpts.Blocks) 968 Diag(DeclType.Loc, diag::err_blocks_disable); 969 970 T = BuildBlockPointerType(T, DeclType.Cls.TypeQuals, D.getIdentifierLoc(), 971 Name); 972 break; 973 case DeclaratorChunk::Pointer: 974 //FIXME: Use ObjCObjectPointer for info when appropriate. 975 if (ShouldBuildInfo) 976 SourceTy = Context.getQualifiedType(Context.getPointerType(SourceTy), 977 Qualifiers::fromCVRMask(DeclType.Ptr.TypeQuals)); 978 // Verify that we're not building a pointer to pointer to function with 979 // exception specification. 980 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 981 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 982 D.setInvalidType(true); 983 // Build the type anyway. 984 } 985 if (getLangOptions().ObjC1 && T->isObjCInterfaceType()) { 986 const ObjCInterfaceType *OIT = T->getAs<ObjCInterfaceType>(); 987 T = Context.getObjCObjectPointerType(T, 988 (ObjCProtocolDecl **)OIT->qual_begin(), 989 OIT->getNumProtocols()); 990 break; 991 } 992 T = BuildPointerType(T, DeclType.Ptr.TypeQuals, DeclType.Loc, Name); 993 break; 994 case DeclaratorChunk::Reference: { 995 Qualifiers Quals; 996 if (DeclType.Ref.HasRestrict) Quals.addRestrict(); 997 998 if (ShouldBuildInfo) { 999 if (DeclType.Ref.LValueRef) 1000 SourceTy = Context.getLValueReferenceType(SourceTy); 1001 else 1002 SourceTy = Context.getRValueReferenceType(SourceTy); 1003 SourceTy = Context.getQualifiedType(SourceTy, Quals); 1004 } 1005 1006 // Verify that we're not building a reference to pointer to function with 1007 // exception specification. 1008 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 1009 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 1010 D.setInvalidType(true); 1011 // Build the type anyway. 1012 } 1013 T = BuildReferenceType(T, DeclType.Ref.LValueRef, Quals, 1014 DeclType.Loc, Name); 1015 break; 1016 } 1017 case DeclaratorChunk::Array: { 1018 if (ShouldBuildInfo) 1019 // We just need to get an array type, the exact type doesn't matter. 1020 SourceTy = Context.getIncompleteArrayType(SourceTy, ArrayType::Normal, 1021 DeclType.Arr.TypeQuals); 1022 1023 // Verify that we're not building an array of pointers to function with 1024 // exception specification. 1025 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 1026 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 1027 D.setInvalidType(true); 1028 // Build the type anyway. 1029 } 1030 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 1031 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 1032 ArrayType::ArraySizeModifier ASM; 1033 if (ATI.isStar) 1034 ASM = ArrayType::Star; 1035 else if (ATI.hasStatic) 1036 ASM = ArrayType::Static; 1037 else 1038 ASM = ArrayType::Normal; 1039 if (ASM == ArrayType::Star && 1040 D.getContext() != Declarator::PrototypeContext) { 1041 // FIXME: This check isn't quite right: it allows star in prototypes 1042 // for function definitions, and disallows some edge cases detailed 1043 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html 1044 Diag(DeclType.Loc, diag::err_array_star_outside_prototype); 1045 ASM = ArrayType::Normal; 1046 D.setInvalidType(true); 1047 } 1048 T = BuildArrayType(T, ASM, ArraySize, 1049 Qualifiers::fromCVRMask(ATI.TypeQuals), 1050 SourceRange(DeclType.Loc, DeclType.EndLoc), Name); 1051 break; 1052 } 1053 case DeclaratorChunk::Function: { 1054 if (ShouldBuildInfo) { 1055 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 1056 llvm::SmallVector<QualType, 16> ArgTys; 1057 1058 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 1059 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 1060 if (Param) { 1061 QualType ArgTy = adjustFunctionParamType(Param->getType()); 1062 1063 ArgTys.push_back(ArgTy); 1064 } 1065 } 1066 SourceTy = Context.getFunctionType(SourceTy, ArgTys.data(), 1067 ArgTys.size(), 1068 FTI.isVariadic, 1069 FTI.TypeQuals); 1070 } 1071 1072 // If the function declarator has a prototype (i.e. it is not () and 1073 // does not have a K&R-style identifier list), then the arguments are part 1074 // of the type, otherwise the argument list is (). 1075 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 1076 1077 // C99 6.7.5.3p1: The return type may not be a function or array type. 1078 if (T->isArrayType() || T->isFunctionType()) { 1079 Diag(DeclType.Loc, diag::err_func_returning_array_function) << T; 1080 T = Context.IntTy; 1081 D.setInvalidType(true); 1082 } 1083 1084 if (getLangOptions().CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) { 1085 // C++ [dcl.fct]p6: 1086 // Types shall not be defined in return or parameter types. 1087 TagDecl *Tag = cast<TagDecl>((Decl *)D.getDeclSpec().getTypeRep()); 1088 if (Tag->isDefinition()) 1089 Diag(Tag->getLocation(), diag::err_type_defined_in_result_type) 1090 << Context.getTypeDeclType(Tag); 1091 } 1092 1093 // Exception specs are not allowed in typedefs. Complain, but add it 1094 // anyway. 1095 if (FTI.hasExceptionSpec && 1096 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1097 Diag(FTI.getThrowLoc(), diag::err_exception_spec_in_typedef); 1098 1099 if (FTI.NumArgs == 0) { 1100 if (getLangOptions().CPlusPlus) { 1101 // C++ 8.3.5p2: If the parameter-declaration-clause is empty, the 1102 // function takes no arguments. 1103 llvm::SmallVector<QualType, 4> Exceptions; 1104 Exceptions.reserve(FTI.NumExceptions); 1105 for (unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) { 1106 // FIXME: Preserve type source info. 1107 QualType ET = GetTypeFromParser(FTI.Exceptions[ei].Ty); 1108 // Check that the type is valid for an exception spec, and drop it 1109 // if not. 1110 if (!CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range)) 1111 Exceptions.push_back(ET); 1112 } 1113 T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic, FTI.TypeQuals, 1114 FTI.hasExceptionSpec, 1115 FTI.hasAnyExceptionSpec, 1116 Exceptions.size(), Exceptions.data()); 1117 } else if (FTI.isVariadic) { 1118 // We allow a zero-parameter variadic function in C if the 1119 // function is marked with the "overloadable" 1120 // attribute. Scan for this attribute now. 1121 bool Overloadable = false; 1122 for (const AttributeList *Attrs = D.getAttributes(); 1123 Attrs; Attrs = Attrs->getNext()) { 1124 if (Attrs->getKind() == AttributeList::AT_overloadable) { 1125 Overloadable = true; 1126 break; 1127 } 1128 } 1129 1130 if (!Overloadable) 1131 Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); 1132 T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic, 0); 1133 } else { 1134 // Simple void foo(), where the incoming T is the result type. 1135 T = Context.getFunctionNoProtoType(T); 1136 } 1137 } else if (FTI.ArgInfo[0].Param == 0) { 1138 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function definition. 1139 Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 1140 } else { 1141 // Otherwise, we have a function with an argument list that is 1142 // potentially variadic. 1143 llvm::SmallVector<QualType, 16> ArgTys; 1144 1145 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 1146 ParmVarDecl *Param = 1147 cast<ParmVarDecl>(FTI.ArgInfo[i].Param.getAs<Decl>()); 1148 QualType ArgTy = Param->getType(); 1149 assert(!ArgTy.isNull() && "Couldn't parse type?"); 1150 1151 // Adjust the parameter type. 1152 assert((ArgTy == adjustParameterType(ArgTy)) && "Unadjusted type?"); 1153 1154 // Look for 'void'. void is allowed only as a single argument to a 1155 // function with no other parameters (C99 6.7.5.3p10). We record 1156 // int(void) as a FunctionProtoType with an empty argument list. 1157 if (ArgTy->isVoidType()) { 1158 // If this is something like 'float(int, void)', reject it. 'void' 1159 // is an incomplete type (C99 6.2.5p19) and function decls cannot 1160 // have arguments of incomplete type. 1161 if (FTI.NumArgs != 1 || FTI.isVariadic) { 1162 Diag(DeclType.Loc, diag::err_void_only_param); 1163 ArgTy = Context.IntTy; 1164 Param->setType(ArgTy); 1165 } else if (FTI.ArgInfo[i].Ident) { 1166 // Reject, but continue to parse 'int(void abc)'. 1167 Diag(FTI.ArgInfo[i].IdentLoc, 1168 diag::err_param_with_void_type); 1169 ArgTy = Context.IntTy; 1170 Param->setType(ArgTy); 1171 } else { 1172 // Reject, but continue to parse 'float(const void)'. 1173 if (ArgTy.hasQualifiers()) 1174 Diag(DeclType.Loc, diag::err_void_param_qualified); 1175 1176 // Do not add 'void' to the ArgTys list. 1177 break; 1178 } 1179 } else if (!FTI.hasPrototype) { 1180 if (ArgTy->isPromotableIntegerType()) { 1181 ArgTy = Context.getPromotedIntegerType(ArgTy); 1182 } else if (const BuiltinType* BTy = ArgTy->getAs<BuiltinType>()) { 1183 if (BTy->getKind() == BuiltinType::Float) 1184 ArgTy = Context.DoubleTy; 1185 } 1186 } 1187 1188 ArgTys.push_back(adjustFunctionParamType(ArgTy)); 1189 } 1190 1191 llvm::SmallVector<QualType, 4> Exceptions; 1192 Exceptions.reserve(FTI.NumExceptions); 1193 for (unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) { 1194 // FIXME: Preserve type source info. 1195 QualType ET = GetTypeFromParser(FTI.Exceptions[ei].Ty); 1196 // Check that the type is valid for an exception spec, and drop it if 1197 // not. 1198 if (!CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range)) 1199 Exceptions.push_back(ET); 1200 } 1201 1202 T = Context.getFunctionType(T, ArgTys.data(), ArgTys.size(), 1203 FTI.isVariadic, FTI.TypeQuals, 1204 FTI.hasExceptionSpec, 1205 FTI.hasAnyExceptionSpec, 1206 Exceptions.size(), Exceptions.data()); 1207 } 1208 break; 1209 } 1210 case DeclaratorChunk::MemberPointer: 1211 // Verify that we're not building a pointer to pointer to function with 1212 // exception specification. 1213 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 1214 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 1215 D.setInvalidType(true); 1216 // Build the type anyway. 1217 } 1218 // The scope spec must refer to a class, or be dependent. 1219 QualType ClsType; 1220 if (isDependentScopeSpecifier(DeclType.Mem.Scope())) { 1221 NestedNameSpecifier *NNS 1222 = (NestedNameSpecifier *)DeclType.Mem.Scope().getScopeRep(); 1223 assert(NNS->getAsType() && "Nested-name-specifier must name a type"); 1224 ClsType = QualType(NNS->getAsType(), 0); 1225 } else if (CXXRecordDecl *RD 1226 = dyn_cast_or_null<CXXRecordDecl>( 1227 computeDeclContext(DeclType.Mem.Scope()))) { 1228 ClsType = Context.getTagDeclType(RD); 1229 } else { 1230 Diag(DeclType.Mem.Scope().getBeginLoc(), 1231 diag::err_illegal_decl_mempointer_in_nonclass) 1232 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 1233 << DeclType.Mem.Scope().getRange(); 1234 D.setInvalidType(true); 1235 } 1236 1237 if (ShouldBuildInfo) { 1238 QualType cls = !ClsType.isNull() ? ClsType : Context.IntTy; 1239 SourceTy = Context.getQualifiedType( 1240 Context.getMemberPointerType(SourceTy, cls.getTypePtr()), 1241 Qualifiers::fromCVRMask(DeclType.Mem.TypeQuals)); 1242 } 1243 1244 if (!ClsType.isNull()) 1245 T = BuildMemberPointerType(T, ClsType, DeclType.Mem.TypeQuals, 1246 DeclType.Loc, D.getIdentifier()); 1247 if (T.isNull()) { 1248 T = Context.IntTy; 1249 D.setInvalidType(true); 1250 } 1251 break; 1252 } 1253 1254 if (T.isNull()) { 1255 D.setInvalidType(true); 1256 T = Context.IntTy; 1257 } 1258 1259 // See if there are any attributes on this declarator chunk. 1260 if (const AttributeList *AL = DeclType.getAttrs()) 1261 ProcessTypeAttributeList(T, AL); 1262 } 1263 1264 if (getLangOptions().CPlusPlus && T->isFunctionType()) { 1265 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>(); 1266 assert(FnTy && "Why oh why is there not a FunctionProtoType here ?"); 1267 1268 // C++ 8.3.5p4: A cv-qualifier-seq shall only be part of the function type 1269 // for a nonstatic member function, the function type to which a pointer 1270 // to member refers, or the top-level function type of a function typedef 1271 // declaration. 1272 if (FnTy->getTypeQuals() != 0 && 1273 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 1274 ((D.getContext() != Declarator::MemberContext && 1275 (!D.getCXXScopeSpec().isSet() || 1276 !computeDeclContext(D.getCXXScopeSpec(), /*FIXME:*/true) 1277 ->isRecord())) || 1278 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static)) { 1279 if (D.isFunctionDeclarator()) 1280 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_function_type); 1281 else 1282 Diag(D.getIdentifierLoc(), 1283 diag::err_invalid_qualified_typedef_function_type_use); 1284 1285 // Strip the cv-quals from the type. 1286 T = Context.getFunctionType(FnTy->getResultType(), FnTy->arg_type_begin(), 1287 FnTy->getNumArgs(), FnTy->isVariadic(), 0); 1288 } 1289 } 1290 1291 // If there were any type attributes applied to the decl itself (not the 1292 // type, apply the type attribute to the type!) 1293 if (const AttributeList *Attrs = D.getAttributes()) 1294 ProcessTypeAttributeList(T, Attrs); 1295 1296 if (ShouldBuildInfo) 1297 *DInfo = GetDeclaratorInfoForDeclarator(D, SourceTy, Skip); 1298 1299 return T; 1300} 1301 1302namespace { 1303 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> { 1304 const DeclSpec &DS; 1305 1306 public: 1307 TypeSpecLocFiller(const DeclSpec &DS) : DS(DS) {} 1308 1309 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 1310 Visit(TL.getUnqualifiedLoc()); 1311 } 1312 void VisitTypedefTypeLoc(TypedefTypeLoc TL) { 1313 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 1314 } 1315 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) { 1316 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 1317 } 1318 void VisitObjCProtocolListTypeLoc(ObjCProtocolListTypeLoc TL) { 1319 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 1320 TL.setLAngleLoc(DS.getProtocolLAngleLoc()); 1321 TL.setRAngleLoc(DS.getSourceRange().getEnd()); 1322 for (unsigned i = 0; i != DS.getNumProtocolQualifiers(); ++i) 1323 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]); 1324 1325 TypeLoc BaseLoc = TL.getBaseTypeLoc(); 1326 if (BaseLoc) 1327 Visit(TL.getBaseTypeLoc()); 1328 } 1329 void VisitTypeLoc(TypeLoc TL) { 1330 // FIXME: add other typespec types and change this to an assert. 1331 TL.initialize(DS.getTypeSpecTypeLoc()); 1332 } 1333 }; 1334 1335 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> { 1336 const DeclaratorChunk &Chunk; 1337 1338 public: 1339 DeclaratorLocFiller(const DeclaratorChunk &Chunk) : Chunk(Chunk) {} 1340 1341 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 1342 llvm::llvm_unreachable("qualified type locs not expected here!"); 1343 } 1344 1345 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) { 1346 assert(Chunk.Kind == DeclaratorChunk::BlockPointer); 1347 TL.setCaretLoc(Chunk.Loc); 1348 } 1349 void VisitPointerTypeLoc(PointerTypeLoc TL) { 1350 assert(Chunk.Kind == DeclaratorChunk::Pointer); 1351 TL.setStarLoc(Chunk.Loc); 1352 } 1353 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 1354 assert(Chunk.Kind == DeclaratorChunk::Pointer); 1355 TL.setStarLoc(Chunk.Loc); 1356 } 1357 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) { 1358 assert(Chunk.Kind == DeclaratorChunk::MemberPointer); 1359 TL.setStarLoc(Chunk.Loc); 1360 // FIXME: nested name specifier 1361 } 1362 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) { 1363 assert(Chunk.Kind == DeclaratorChunk::Reference); 1364 assert(Chunk.Ref.LValueRef); 1365 TL.setAmpLoc(Chunk.Loc); 1366 } 1367 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) { 1368 assert(Chunk.Kind == DeclaratorChunk::Reference); 1369 assert(!Chunk.Ref.LValueRef); 1370 TL.setAmpAmpLoc(Chunk.Loc); 1371 } 1372 void VisitArrayTypeLoc(ArrayTypeLoc TL) { 1373 assert(Chunk.Kind == DeclaratorChunk::Array); 1374 TL.setLBracketLoc(Chunk.Loc); 1375 TL.setRBracketLoc(Chunk.EndLoc); 1376 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts)); 1377 } 1378 void VisitFunctionTypeLoc(FunctionTypeLoc TL) { 1379 assert(Chunk.Kind == DeclaratorChunk::Function); 1380 TL.setLParenLoc(Chunk.Loc); 1381 TL.setRParenLoc(Chunk.EndLoc); 1382 1383 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun; 1384 for (unsigned i = 0, e = FTI.NumArgs, tpi = 0; i != e; ++i) { 1385 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 1386 if (Param) { 1387 assert(tpi < TL.getNumArgs()); 1388 TL.setArg(tpi++, Param); 1389 } 1390 } 1391 // FIXME: exception specs 1392 } 1393 1394 void VisitTypeLoc(TypeLoc TL) { 1395 llvm::llvm_unreachable("unsupported TypeLoc kind in declarator!"); 1396 } 1397 }; 1398} 1399 1400/// \brief Create and instantiate a DeclaratorInfo with type source information. 1401/// 1402/// \param T QualType referring to the type as written in source code. 1403DeclaratorInfo * 1404Sema::GetDeclaratorInfoForDeclarator(Declarator &D, QualType T, unsigned Skip) { 1405 DeclaratorInfo *DInfo = Context.CreateDeclaratorInfo(T); 1406 UnqualTypeLoc CurrTL = DInfo->getTypeLoc().getUnqualifiedLoc(); 1407 1408 for (unsigned i = Skip, e = D.getNumTypeObjects(); i != e; ++i) { 1409 DeclaratorLocFiller(D.getTypeObject(i)).Visit(CurrTL); 1410 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 1411 } 1412 1413 TypeSpecLocFiller(D.getDeclSpec()).Visit(CurrTL); 1414 1415 return DInfo; 1416} 1417 1418/// \brief Create a LocInfoType to hold the given QualType and DeclaratorInfo. 1419QualType Sema::CreateLocInfoType(QualType T, DeclaratorInfo *DInfo) { 1420 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser 1421 // and Sema during declaration parsing. Try deallocating/caching them when 1422 // it's appropriate, instead of allocating them and keeping them around. 1423 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType), 8); 1424 new (LocT) LocInfoType(T, DInfo); 1425 assert(LocT->getTypeClass() != T->getTypeClass() && 1426 "LocInfoType's TypeClass conflicts with an existing Type class"); 1427 return QualType(LocT, 0); 1428} 1429 1430void LocInfoType::getAsStringInternal(std::string &Str, 1431 const PrintingPolicy &Policy) const { 1432 assert(false && "LocInfoType leaked into the type system; an opaque TypeTy*" 1433 " was used directly instead of getting the QualType through" 1434 " GetTypeFromParser"); 1435} 1436 1437/// ObjCGetTypeForMethodDefinition - Builds the type for a method definition 1438/// declarator 1439QualType Sema::ObjCGetTypeForMethodDefinition(DeclPtrTy D) { 1440 ObjCMethodDecl *MDecl = cast<ObjCMethodDecl>(D.getAs<Decl>()); 1441 QualType T = MDecl->getResultType(); 1442 llvm::SmallVector<QualType, 16> ArgTys; 1443 1444 // Add the first two invisible argument types for self and _cmd. 1445 if (MDecl->isInstanceMethod()) { 1446 QualType selfTy = Context.getObjCInterfaceType(MDecl->getClassInterface()); 1447 selfTy = Context.getPointerType(selfTy); 1448 ArgTys.push_back(selfTy); 1449 } else 1450 ArgTys.push_back(Context.getObjCIdType()); 1451 ArgTys.push_back(Context.getObjCSelType()); 1452 1453 for (ObjCMethodDecl::param_iterator PI = MDecl->param_begin(), 1454 E = MDecl->param_end(); PI != E; ++PI) { 1455 QualType ArgTy = (*PI)->getType(); 1456 assert(!ArgTy.isNull() && "Couldn't parse type?"); 1457 ArgTy = adjustParameterType(ArgTy); 1458 ArgTys.push_back(ArgTy); 1459 } 1460 T = Context.getFunctionType(T, &ArgTys[0], ArgTys.size(), 1461 MDecl->isVariadic(), 0); 1462 return T; 1463} 1464 1465/// UnwrapSimilarPointerTypes - If T1 and T2 are pointer types that 1466/// may be similar (C++ 4.4), replaces T1 and T2 with the type that 1467/// they point to and return true. If T1 and T2 aren't pointer types 1468/// or pointer-to-member types, or if they are not similar at this 1469/// level, returns false and leaves T1 and T2 unchanged. Top-level 1470/// qualifiers on T1 and T2 are ignored. This function will typically 1471/// be called in a loop that successively "unwraps" pointer and 1472/// pointer-to-member types to compare them at each level. 1473bool Sema::UnwrapSimilarPointerTypes(QualType& T1, QualType& T2) { 1474 const PointerType *T1PtrType = T1->getAs<PointerType>(), 1475 *T2PtrType = T2->getAs<PointerType>(); 1476 if (T1PtrType && T2PtrType) { 1477 T1 = T1PtrType->getPointeeType(); 1478 T2 = T2PtrType->getPointeeType(); 1479 return true; 1480 } 1481 1482 const MemberPointerType *T1MPType = T1->getAs<MemberPointerType>(), 1483 *T2MPType = T2->getAs<MemberPointerType>(); 1484 if (T1MPType && T2MPType && 1485 Context.getCanonicalType(T1MPType->getClass()) == 1486 Context.getCanonicalType(T2MPType->getClass())) { 1487 T1 = T1MPType->getPointeeType(); 1488 T2 = T2MPType->getPointeeType(); 1489 return true; 1490 } 1491 return false; 1492} 1493 1494Sema::TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 1495 // C99 6.7.6: Type names have no identifier. This is already validated by 1496 // the parser. 1497 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 1498 1499 DeclaratorInfo *DInfo = 0; 1500 TagDecl *OwnedTag = 0; 1501 QualType T = GetTypeForDeclarator(D, S, &DInfo, /*Skip=*/0, &OwnedTag); 1502 if (D.isInvalidType()) 1503 return true; 1504 1505 if (getLangOptions().CPlusPlus) { 1506 // Check that there are no default arguments (C++ only). 1507 CheckExtraCXXDefaultArguments(D); 1508 1509 // C++0x [dcl.type]p3: 1510 // A type-specifier-seq shall not define a class or enumeration 1511 // unless it appears in the type-id of an alias-declaration 1512 // (7.1.3). 1513 if (OwnedTag && OwnedTag->isDefinition()) 1514 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_type_specifier) 1515 << Context.getTypeDeclType(OwnedTag); 1516 } 1517 1518 if (DInfo) 1519 T = CreateLocInfoType(T, DInfo); 1520 1521 return T.getAsOpaquePtr(); 1522} 1523 1524 1525 1526//===----------------------------------------------------------------------===// 1527// Type Attribute Processing 1528//===----------------------------------------------------------------------===// 1529 1530/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 1531/// specified type. The attribute contains 1 argument, the id of the address 1532/// space for the type. 1533static void HandleAddressSpaceTypeAttribute(QualType &Type, 1534 const AttributeList &Attr, Sema &S){ 1535 1536 // If this type is already address space qualified, reject it. 1537 // Clause 6.7.3 - Type qualifiers: "No type shall be qualified by qualifiers 1538 // for two or more different address spaces." 1539 if (Type.getAddressSpace()) { 1540 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 1541 return; 1542 } 1543 1544 // Check the attribute arguments. 1545 if (Attr.getNumArgs() != 1) { 1546 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1547 return; 1548 } 1549 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 1550 llvm::APSInt addrSpace(32); 1551 if (!ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 1552 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 1553 << ASArgExpr->getSourceRange(); 1554 return; 1555 } 1556 1557 // Bounds checking. 1558 if (addrSpace.isSigned()) { 1559 if (addrSpace.isNegative()) { 1560 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative) 1561 << ASArgExpr->getSourceRange(); 1562 return; 1563 } 1564 addrSpace.setIsSigned(false); 1565 } 1566 llvm::APSInt max(addrSpace.getBitWidth()); 1567 max = Qualifiers::MaxAddressSpace; 1568 if (addrSpace > max) { 1569 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high) 1570 << Qualifiers::MaxAddressSpace << ASArgExpr->getSourceRange(); 1571 return; 1572 } 1573 1574 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 1575 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 1576} 1577 1578/// HandleObjCGCTypeAttribute - Process an objc's gc attribute on the 1579/// specified type. The attribute contains 1 argument, weak or strong. 1580static void HandleObjCGCTypeAttribute(QualType &Type, 1581 const AttributeList &Attr, Sema &S) { 1582 if (Type.getObjCGCAttr() != Qualifiers::GCNone) { 1583 S.Diag(Attr.getLoc(), diag::err_attribute_multiple_objc_gc); 1584 return; 1585 } 1586 1587 // Check the attribute arguments. 1588 if (!Attr.getParameterName()) { 1589 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) 1590 << "objc_gc" << 1; 1591 return; 1592 } 1593 Qualifiers::GC GCAttr; 1594 if (Attr.getNumArgs() != 0) { 1595 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1596 return; 1597 } 1598 if (Attr.getParameterName()->isStr("weak")) 1599 GCAttr = Qualifiers::Weak; 1600 else if (Attr.getParameterName()->isStr("strong")) 1601 GCAttr = Qualifiers::Strong; 1602 else { 1603 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported) 1604 << "objc_gc" << Attr.getParameterName(); 1605 return; 1606 } 1607 1608 Type = S.Context.getObjCGCQualType(Type, GCAttr); 1609} 1610 1611/// HandleNoReturnTypeAttribute - Process the noreturn attribute on the 1612/// specified type. The attribute contains 0 arguments. 1613static void HandleNoReturnTypeAttribute(QualType &Type, 1614 const AttributeList &Attr, Sema &S) { 1615 if (Attr.getNumArgs() != 0) 1616 return; 1617 1618 // We only apply this to a pointer to function or a pointer to block. 1619 if (!Type->isFunctionPointerType() 1620 && !Type->isBlockPointerType() 1621 && !Type->isFunctionType()) 1622 return; 1623 1624 Type = S.Context.getNoReturnType(Type); 1625} 1626 1627void Sema::ProcessTypeAttributeList(QualType &Result, const AttributeList *AL) { 1628 // Scan through and apply attributes to this type where it makes sense. Some 1629 // attributes (such as __address_space__, __vector_size__, etc) apply to the 1630 // type, but others can be present in the type specifiers even though they 1631 // apply to the decl. Here we apply type attributes and ignore the rest. 1632 for (; AL; AL = AL->getNext()) { 1633 // If this is an attribute we can handle, do so now, otherwise, add it to 1634 // the LeftOverAttrs list for rechaining. 1635 switch (AL->getKind()) { 1636 default: break; 1637 case AttributeList::AT_address_space: 1638 HandleAddressSpaceTypeAttribute(Result, *AL, *this); 1639 break; 1640 case AttributeList::AT_objc_gc: 1641 HandleObjCGCTypeAttribute(Result, *AL, *this); 1642 break; 1643 case AttributeList::AT_noreturn: 1644 HandleNoReturnTypeAttribute(Result, *AL, *this); 1645 break; 1646 } 1647 } 1648} 1649 1650/// @brief Ensure that the type T is a complete type. 1651/// 1652/// This routine checks whether the type @p T is complete in any 1653/// context where a complete type is required. If @p T is a complete 1654/// type, returns false. If @p T is a class template specialization, 1655/// this routine then attempts to perform class template 1656/// instantiation. If instantiation fails, or if @p T is incomplete 1657/// and cannot be completed, issues the diagnostic @p diag (giving it 1658/// the type @p T) and returns true. 1659/// 1660/// @param Loc The location in the source that the incomplete type 1661/// diagnostic should refer to. 1662/// 1663/// @param T The type that this routine is examining for completeness. 1664/// 1665/// @param PD The partial diagnostic that will be printed out if T is not a 1666/// complete type. 1667/// 1668/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 1669/// @c false otherwise. 1670bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 1671 const PartialDiagnostic &PD, 1672 std::pair<SourceLocation, 1673 PartialDiagnostic> Note) { 1674 unsigned diag = PD.getDiagID(); 1675 1676 // FIXME: Add this assertion to help us flush out problems with 1677 // checking for dependent types and type-dependent expressions. 1678 // 1679 // assert(!T->isDependentType() && 1680 // "Can't ask whether a dependent type is complete"); 1681 1682 // If we have a complete type, we're done. 1683 if (!T->isIncompleteType()) 1684 return false; 1685 1686 // If we have a class template specialization or a class member of a 1687 // class template specialization, try to instantiate it. 1688 if (const RecordType *Record = T->getAs<RecordType>()) { 1689 if (ClassTemplateSpecializationDecl *ClassTemplateSpec 1690 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { 1691 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) { 1692 if (Loc.isValid()) 1693 ClassTemplateSpec->setPointOfInstantiation(Loc); 1694 return InstantiateClassTemplateSpecialization(ClassTemplateSpec, 1695 TSK_ImplicitInstantiation, 1696 /*Complain=*/diag != 0); 1697 } 1698 } else if (CXXRecordDecl *Rec 1699 = dyn_cast<CXXRecordDecl>(Record->getDecl())) { 1700 if (CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass()) { 1701 MemberSpecializationInfo *MSInfo = Rec->getMemberSpecializationInfo(); 1702 assert(MSInfo && "Missing member specialization information?"); 1703 // This record was instantiated from a class within a template. 1704 if (MSInfo->getTemplateSpecializationKind() 1705 != TSK_ExplicitSpecialization) { 1706 MSInfo->setPointOfInstantiation(Loc); 1707 return InstantiateClass(Loc, Rec, Pattern, 1708 getTemplateInstantiationArgs(Rec), 1709 TSK_ImplicitInstantiation, 1710 /*Complain=*/diag != 0); 1711 } 1712 } 1713 } 1714 } 1715 1716 if (diag == 0) 1717 return true; 1718 1719 // We have an incomplete type. Produce a diagnostic. 1720 Diag(Loc, PD) << T; 1721 1722 // If we have a note, produce it. 1723 if (!Note.first.isInvalid()) 1724 Diag(Note.first, Note.second); 1725 1726 // If the type was a forward declaration of a class/struct/union 1727 // type, produce 1728 const TagType *Tag = 0; 1729 if (const RecordType *Record = T->getAs<RecordType>()) 1730 Tag = Record; 1731 else if (const EnumType *Enum = T->getAs<EnumType>()) 1732 Tag = Enum; 1733 1734 if (Tag && !Tag->getDecl()->isInvalidDecl()) 1735 Diag(Tag->getDecl()->getLocation(), 1736 Tag->isBeingDefined() ? diag::note_type_being_defined 1737 : diag::note_forward_declaration) 1738 << QualType(Tag, 0); 1739 1740 return true; 1741} 1742 1743/// \brief Retrieve a version of the type 'T' that is qualified by the 1744/// nested-name-specifier contained in SS. 1745QualType Sema::getQualifiedNameType(const CXXScopeSpec &SS, QualType T) { 1746 if (!SS.isSet() || SS.isInvalid() || T.isNull()) 1747 return T; 1748 1749 NestedNameSpecifier *NNS 1750 = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 1751 return Context.getQualifiedNameType(NNS, T); 1752} 1753 1754QualType Sema::BuildTypeofExprType(Expr *E) { 1755 return Context.getTypeOfExprType(E); 1756} 1757 1758QualType Sema::BuildDecltypeType(Expr *E) { 1759 if (E->getType() == Context.OverloadTy) { 1760 Diag(E->getLocStart(), 1761 diag::err_cannot_determine_declared_type_of_overloaded_function); 1762 return QualType(); 1763 } 1764 return Context.getDecltypeType(E); 1765} 1766