SemaExprCXX.cpp revision 429bb276991ff2dbc7c5b438828b9b7737cb15eb
1//===--- SemaExprCXX.cpp - Semantic Analysis for Expressions --------------===// 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 semantic analysis for C++ expressions. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/DeclSpec.h" 16#include "clang/Sema/Initialization.h" 17#include "clang/Sema/Lookup.h" 18#include "clang/Sema/ParsedTemplate.h" 19#include "clang/Sema/ScopeInfo.h" 20#include "clang/Sema/TemplateDeduction.h" 21#include "clang/AST/ASTContext.h" 22#include "clang/AST/CXXInheritance.h" 23#include "clang/AST/DeclObjC.h" 24#include "clang/AST/ExprCXX.h" 25#include "clang/AST/ExprObjC.h" 26#include "clang/AST/TypeLoc.h" 27#include "clang/Basic/PartialDiagnostic.h" 28#include "clang/Basic/TargetInfo.h" 29#include "clang/Lex/Preprocessor.h" 30#include "llvm/ADT/STLExtras.h" 31using namespace clang; 32using namespace sema; 33 34ParsedType Sema::getDestructorName(SourceLocation TildeLoc, 35 IdentifierInfo &II, 36 SourceLocation NameLoc, 37 Scope *S, CXXScopeSpec &SS, 38 ParsedType ObjectTypePtr, 39 bool EnteringContext) { 40 // Determine where to perform name lookup. 41 42 // FIXME: This area of the standard is very messy, and the current 43 // wording is rather unclear about which scopes we search for the 44 // destructor name; see core issues 399 and 555. Issue 399 in 45 // particular shows where the current description of destructor name 46 // lookup is completely out of line with existing practice, e.g., 47 // this appears to be ill-formed: 48 // 49 // namespace N { 50 // template <typename T> struct S { 51 // ~S(); 52 // }; 53 // } 54 // 55 // void f(N::S<int>* s) { 56 // s->N::S<int>::~S(); 57 // } 58 // 59 // See also PR6358 and PR6359. 60 // For this reason, we're currently only doing the C++03 version of this 61 // code; the C++0x version has to wait until we get a proper spec. 62 QualType SearchType; 63 DeclContext *LookupCtx = 0; 64 bool isDependent = false; 65 bool LookInScope = false; 66 67 // If we have an object type, it's because we are in a 68 // pseudo-destructor-expression or a member access expression, and 69 // we know what type we're looking for. 70 if (ObjectTypePtr) 71 SearchType = GetTypeFromParser(ObjectTypePtr); 72 73 if (SS.isSet()) { 74 NestedNameSpecifier *NNS = (NestedNameSpecifier *)SS.getScopeRep(); 75 76 bool AlreadySearched = false; 77 bool LookAtPrefix = true; 78 // C++ [basic.lookup.qual]p6: 79 // If a pseudo-destructor-name (5.2.4) contains a nested-name-specifier, 80 // the type-names are looked up as types in the scope designated by the 81 // nested-name-specifier. In a qualified-id of the form: 82 // 83 // ::[opt] nested-name-specifier ~ class-name 84 // 85 // where the nested-name-specifier designates a namespace scope, and in 86 // a qualified-id of the form: 87 // 88 // ::opt nested-name-specifier class-name :: ~ class-name 89 // 90 // the class-names are looked up as types in the scope designated by 91 // the nested-name-specifier. 92 // 93 // Here, we check the first case (completely) and determine whether the 94 // code below is permitted to look at the prefix of the 95 // nested-name-specifier. 96 DeclContext *DC = computeDeclContext(SS, EnteringContext); 97 if (DC && DC->isFileContext()) { 98 AlreadySearched = true; 99 LookupCtx = DC; 100 isDependent = false; 101 } else if (DC && isa<CXXRecordDecl>(DC)) 102 LookAtPrefix = false; 103 104 // The second case from the C++03 rules quoted further above. 105 NestedNameSpecifier *Prefix = 0; 106 if (AlreadySearched) { 107 // Nothing left to do. 108 } else if (LookAtPrefix && (Prefix = NNS->getPrefix())) { 109 CXXScopeSpec PrefixSS; 110 PrefixSS.Adopt(NestedNameSpecifierLoc(Prefix, SS.location_data())); 111 LookupCtx = computeDeclContext(PrefixSS, EnteringContext); 112 isDependent = isDependentScopeSpecifier(PrefixSS); 113 } else if (ObjectTypePtr) { 114 LookupCtx = computeDeclContext(SearchType); 115 isDependent = SearchType->isDependentType(); 116 } else { 117 LookupCtx = computeDeclContext(SS, EnteringContext); 118 isDependent = LookupCtx && LookupCtx->isDependentContext(); 119 } 120 121 LookInScope = false; 122 } else if (ObjectTypePtr) { 123 // C++ [basic.lookup.classref]p3: 124 // If the unqualified-id is ~type-name, the type-name is looked up 125 // in the context of the entire postfix-expression. If the type T 126 // of the object expression is of a class type C, the type-name is 127 // also looked up in the scope of class C. At least one of the 128 // lookups shall find a name that refers to (possibly 129 // cv-qualified) T. 130 LookupCtx = computeDeclContext(SearchType); 131 isDependent = SearchType->isDependentType(); 132 assert((isDependent || !SearchType->isIncompleteType()) && 133 "Caller should have completed object type"); 134 135 LookInScope = true; 136 } else { 137 // Perform lookup into the current scope (only). 138 LookInScope = true; 139 } 140 141 TypeDecl *NonMatchingTypeDecl = 0; 142 LookupResult Found(*this, &II, NameLoc, LookupOrdinaryName); 143 for (unsigned Step = 0; Step != 2; ++Step) { 144 // Look for the name first in the computed lookup context (if we 145 // have one) and, if that fails to find a match, in the scope (if 146 // we're allowed to look there). 147 Found.clear(); 148 if (Step == 0 && LookupCtx) 149 LookupQualifiedName(Found, LookupCtx); 150 else if (Step == 1 && LookInScope && S) 151 LookupName(Found, S); 152 else 153 continue; 154 155 // FIXME: Should we be suppressing ambiguities here? 156 if (Found.isAmbiguous()) 157 return ParsedType(); 158 159 if (TypeDecl *Type = Found.getAsSingle<TypeDecl>()) { 160 QualType T = Context.getTypeDeclType(Type); 161 162 if (SearchType.isNull() || SearchType->isDependentType() || 163 Context.hasSameUnqualifiedType(T, SearchType)) { 164 // We found our type! 165 166 return ParsedType::make(T); 167 } 168 169 if (!SearchType.isNull()) 170 NonMatchingTypeDecl = Type; 171 } 172 173 // If the name that we found is a class template name, and it is 174 // the same name as the template name in the last part of the 175 // nested-name-specifier (if present) or the object type, then 176 // this is the destructor for that class. 177 // FIXME: This is a workaround until we get real drafting for core 178 // issue 399, for which there isn't even an obvious direction. 179 if (ClassTemplateDecl *Template = Found.getAsSingle<ClassTemplateDecl>()) { 180 QualType MemberOfType; 181 if (SS.isSet()) { 182 if (DeclContext *Ctx = computeDeclContext(SS, EnteringContext)) { 183 // Figure out the type of the context, if it has one. 184 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Ctx)) 185 MemberOfType = Context.getTypeDeclType(Record); 186 } 187 } 188 if (MemberOfType.isNull()) 189 MemberOfType = SearchType; 190 191 if (MemberOfType.isNull()) 192 continue; 193 194 // We're referring into a class template specialization. If the 195 // class template we found is the same as the template being 196 // specialized, we found what we are looking for. 197 if (const RecordType *Record = MemberOfType->getAs<RecordType>()) { 198 if (ClassTemplateSpecializationDecl *Spec 199 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { 200 if (Spec->getSpecializedTemplate()->getCanonicalDecl() == 201 Template->getCanonicalDecl()) 202 return ParsedType::make(MemberOfType); 203 } 204 205 continue; 206 } 207 208 // We're referring to an unresolved class template 209 // specialization. Determine whether we class template we found 210 // is the same as the template being specialized or, if we don't 211 // know which template is being specialized, that it at least 212 // has the same name. 213 if (const TemplateSpecializationType *SpecType 214 = MemberOfType->getAs<TemplateSpecializationType>()) { 215 TemplateName SpecName = SpecType->getTemplateName(); 216 217 // The class template we found is the same template being 218 // specialized. 219 if (TemplateDecl *SpecTemplate = SpecName.getAsTemplateDecl()) { 220 if (SpecTemplate->getCanonicalDecl() == Template->getCanonicalDecl()) 221 return ParsedType::make(MemberOfType); 222 223 continue; 224 } 225 226 // The class template we found has the same name as the 227 // (dependent) template name being specialized. 228 if (DependentTemplateName *DepTemplate 229 = SpecName.getAsDependentTemplateName()) { 230 if (DepTemplate->isIdentifier() && 231 DepTemplate->getIdentifier() == Template->getIdentifier()) 232 return ParsedType::make(MemberOfType); 233 234 continue; 235 } 236 } 237 } 238 } 239 240 if (isDependent) { 241 // We didn't find our type, but that's okay: it's dependent 242 // anyway. 243 244 // FIXME: What if we have no nested-name-specifier? 245 QualType T = CheckTypenameType(ETK_None, SourceLocation(), 246 SS.getWithLocInContext(Context), 247 II, NameLoc); 248 return ParsedType::make(T); 249 } 250 251 if (NonMatchingTypeDecl) { 252 QualType T = Context.getTypeDeclType(NonMatchingTypeDecl); 253 Diag(NameLoc, diag::err_destructor_expr_type_mismatch) 254 << T << SearchType; 255 Diag(NonMatchingTypeDecl->getLocation(), diag::note_destructor_type_here) 256 << T; 257 } else if (ObjectTypePtr) 258 Diag(NameLoc, diag::err_ident_in_dtor_not_a_type) 259 << &II; 260 else 261 Diag(NameLoc, diag::err_destructor_class_name); 262 263 return ParsedType(); 264} 265 266/// \brief Build a C++ typeid expression with a type operand. 267ExprResult Sema::BuildCXXTypeId(QualType TypeInfoType, 268 SourceLocation TypeidLoc, 269 TypeSourceInfo *Operand, 270 SourceLocation RParenLoc) { 271 // C++ [expr.typeid]p4: 272 // The top-level cv-qualifiers of the lvalue expression or the type-id 273 // that is the operand of typeid are always ignored. 274 // If the type of the type-id is a class type or a reference to a class 275 // type, the class shall be completely-defined. 276 Qualifiers Quals; 277 QualType T 278 = Context.getUnqualifiedArrayType(Operand->getType().getNonReferenceType(), 279 Quals); 280 if (T->getAs<RecordType>() && 281 RequireCompleteType(TypeidLoc, T, diag::err_incomplete_typeid)) 282 return ExprError(); 283 284 return Owned(new (Context) CXXTypeidExpr(TypeInfoType.withConst(), 285 Operand, 286 SourceRange(TypeidLoc, RParenLoc))); 287} 288 289/// \brief Build a C++ typeid expression with an expression operand. 290ExprResult Sema::BuildCXXTypeId(QualType TypeInfoType, 291 SourceLocation TypeidLoc, 292 Expr *E, 293 SourceLocation RParenLoc) { 294 bool isUnevaluatedOperand = true; 295 if (E && !E->isTypeDependent()) { 296 QualType T = E->getType(); 297 if (const RecordType *RecordT = T->getAs<RecordType>()) { 298 CXXRecordDecl *RecordD = cast<CXXRecordDecl>(RecordT->getDecl()); 299 // C++ [expr.typeid]p3: 300 // [...] If the type of the expression is a class type, the class 301 // shall be completely-defined. 302 if (RequireCompleteType(TypeidLoc, T, diag::err_incomplete_typeid)) 303 return ExprError(); 304 305 // C++ [expr.typeid]p3: 306 // When typeid is applied to an expression other than an glvalue of a 307 // polymorphic class type [...] [the] expression is an unevaluated 308 // operand. [...] 309 if (RecordD->isPolymorphic() && E->Classify(Context).isGLValue()) { 310 isUnevaluatedOperand = false; 311 312 // We require a vtable to query the type at run time. 313 MarkVTableUsed(TypeidLoc, RecordD); 314 } 315 } 316 317 // C++ [expr.typeid]p4: 318 // [...] If the type of the type-id is a reference to a possibly 319 // cv-qualified type, the result of the typeid expression refers to a 320 // std::type_info object representing the cv-unqualified referenced 321 // type. 322 Qualifiers Quals; 323 QualType UnqualT = Context.getUnqualifiedArrayType(T, Quals); 324 if (!Context.hasSameType(T, UnqualT)) { 325 T = UnqualT; 326 E = ImpCastExprToType(E, UnqualT, CK_NoOp, CastCategory(E)).take(); 327 } 328 } 329 330 // If this is an unevaluated operand, clear out the set of 331 // declaration references we have been computing and eliminate any 332 // temporaries introduced in its computation. 333 if (isUnevaluatedOperand) 334 ExprEvalContexts.back().Context = Unevaluated; 335 336 return Owned(new (Context) CXXTypeidExpr(TypeInfoType.withConst(), 337 E, 338 SourceRange(TypeidLoc, RParenLoc))); 339} 340 341/// ActOnCXXTypeidOfType - Parse typeid( type-id ) or typeid (expression); 342ExprResult 343Sema::ActOnCXXTypeid(SourceLocation OpLoc, SourceLocation LParenLoc, 344 bool isType, void *TyOrExpr, SourceLocation RParenLoc) { 345 // Find the std::type_info type. 346 if (!getStdNamespace()) 347 return ExprError(Diag(OpLoc, diag::err_need_header_before_typeid)); 348 349 if (!CXXTypeInfoDecl) { 350 IdentifierInfo *TypeInfoII = &PP.getIdentifierTable().get("type_info"); 351 LookupResult R(*this, TypeInfoII, SourceLocation(), LookupTagName); 352 LookupQualifiedName(R, getStdNamespace()); 353 CXXTypeInfoDecl = R.getAsSingle<RecordDecl>(); 354 if (!CXXTypeInfoDecl) 355 return ExprError(Diag(OpLoc, diag::err_need_header_before_typeid)); 356 } 357 358 QualType TypeInfoType = Context.getTypeDeclType(CXXTypeInfoDecl); 359 360 if (isType) { 361 // The operand is a type; handle it as such. 362 TypeSourceInfo *TInfo = 0; 363 QualType T = GetTypeFromParser(ParsedType::getFromOpaquePtr(TyOrExpr), 364 &TInfo); 365 if (T.isNull()) 366 return ExprError(); 367 368 if (!TInfo) 369 TInfo = Context.getTrivialTypeSourceInfo(T, OpLoc); 370 371 return BuildCXXTypeId(TypeInfoType, OpLoc, TInfo, RParenLoc); 372 } 373 374 // The operand is an expression. 375 return BuildCXXTypeId(TypeInfoType, OpLoc, (Expr*)TyOrExpr, RParenLoc); 376} 377 378/// Retrieve the UuidAttr associated with QT. 379static UuidAttr *GetUuidAttrOfType(QualType QT) { 380 // Optionally remove one level of pointer, reference or array indirection. 381 const Type *Ty = QT.getTypePtr();; 382 if (QT->isPointerType() || QT->isReferenceType()) 383 Ty = QT->getPointeeType().getTypePtr(); 384 else if (QT->isArrayType()) 385 Ty = cast<ArrayType>(QT)->getElementType().getTypePtr(); 386 387 // Loop all class definition and declaration looking for an uuid attribute. 388 CXXRecordDecl *RD = Ty->getAsCXXRecordDecl(); 389 while (RD) { 390 if (UuidAttr *Uuid = RD->getAttr<UuidAttr>()) 391 return Uuid; 392 RD = RD->getPreviousDeclaration(); 393 } 394 return 0; 395} 396 397/// \brief Build a Microsoft __uuidof expression with a type operand. 398ExprResult Sema::BuildCXXUuidof(QualType TypeInfoType, 399 SourceLocation TypeidLoc, 400 TypeSourceInfo *Operand, 401 SourceLocation RParenLoc) { 402 if (!Operand->getType()->isDependentType()) { 403 if (!GetUuidAttrOfType(Operand->getType())) 404 return ExprError(Diag(TypeidLoc, diag::err_uuidof_without_guid)); 405 } 406 407 // FIXME: add __uuidof semantic analysis for type operand. 408 return Owned(new (Context) CXXUuidofExpr(TypeInfoType.withConst(), 409 Operand, 410 SourceRange(TypeidLoc, RParenLoc))); 411} 412 413/// \brief Build a Microsoft __uuidof expression with an expression operand. 414ExprResult Sema::BuildCXXUuidof(QualType TypeInfoType, 415 SourceLocation TypeidLoc, 416 Expr *E, 417 SourceLocation RParenLoc) { 418 if (!E->getType()->isDependentType()) { 419 if (!GetUuidAttrOfType(E->getType()) && 420 !E->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) 421 return ExprError(Diag(TypeidLoc, diag::err_uuidof_without_guid)); 422 } 423 // FIXME: add __uuidof semantic analysis for type operand. 424 return Owned(new (Context) CXXUuidofExpr(TypeInfoType.withConst(), 425 E, 426 SourceRange(TypeidLoc, RParenLoc))); 427} 428 429/// ActOnCXXUuidof - Parse __uuidof( type-id ) or __uuidof (expression); 430ExprResult 431Sema::ActOnCXXUuidof(SourceLocation OpLoc, SourceLocation LParenLoc, 432 bool isType, void *TyOrExpr, SourceLocation RParenLoc) { 433 // If MSVCGuidDecl has not been cached, do the lookup. 434 if (!MSVCGuidDecl) { 435 IdentifierInfo *GuidII = &PP.getIdentifierTable().get("_GUID"); 436 LookupResult R(*this, GuidII, SourceLocation(), LookupTagName); 437 LookupQualifiedName(R, Context.getTranslationUnitDecl()); 438 MSVCGuidDecl = R.getAsSingle<RecordDecl>(); 439 if (!MSVCGuidDecl) 440 return ExprError(Diag(OpLoc, diag::err_need_header_before_ms_uuidof)); 441 } 442 443 QualType GuidType = Context.getTypeDeclType(MSVCGuidDecl); 444 445 if (isType) { 446 // The operand is a type; handle it as such. 447 TypeSourceInfo *TInfo = 0; 448 QualType T = GetTypeFromParser(ParsedType::getFromOpaquePtr(TyOrExpr), 449 &TInfo); 450 if (T.isNull()) 451 return ExprError(); 452 453 if (!TInfo) 454 TInfo = Context.getTrivialTypeSourceInfo(T, OpLoc); 455 456 return BuildCXXUuidof(GuidType, OpLoc, TInfo, RParenLoc); 457 } 458 459 // The operand is an expression. 460 return BuildCXXUuidof(GuidType, OpLoc, (Expr*)TyOrExpr, RParenLoc); 461} 462 463/// ActOnCXXBoolLiteral - Parse {true,false} literals. 464ExprResult 465Sema::ActOnCXXBoolLiteral(SourceLocation OpLoc, tok::TokenKind Kind) { 466 assert((Kind == tok::kw_true || Kind == tok::kw_false) && 467 "Unknown C++ Boolean value!"); 468 return Owned(new (Context) CXXBoolLiteralExpr(Kind == tok::kw_true, 469 Context.BoolTy, OpLoc)); 470} 471 472/// ActOnCXXNullPtrLiteral - Parse 'nullptr'. 473ExprResult 474Sema::ActOnCXXNullPtrLiteral(SourceLocation Loc) { 475 return Owned(new (Context) CXXNullPtrLiteralExpr(Context.NullPtrTy, Loc)); 476} 477 478/// ActOnCXXThrow - Parse throw expressions. 479ExprResult 480Sema::ActOnCXXThrow(SourceLocation OpLoc, Expr *Ex) { 481 // Don't report an error if 'throw' is used in system headers. 482 if (!getLangOptions().CXXExceptions && 483 !getSourceManager().isInSystemHeader(OpLoc)) 484 Diag(OpLoc, diag::err_exceptions_disabled) << "throw"; 485 486 if (Ex && !Ex->isTypeDependent()) { 487 ExprResult ExRes = CheckCXXThrowOperand(OpLoc, Ex); 488 if (ExRes.isInvalid()) 489 return ExprError(); 490 Ex = ExRes.take(); 491 } 492 return Owned(new (Context) CXXThrowExpr(Ex, Context.VoidTy, OpLoc)); 493} 494 495/// CheckCXXThrowOperand - Validate the operand of a throw. 496ExprResult Sema::CheckCXXThrowOperand(SourceLocation ThrowLoc, Expr *E) { 497 // C++ [except.throw]p3: 498 // A throw-expression initializes a temporary object, called the exception 499 // object, the type of which is determined by removing any top-level 500 // cv-qualifiers from the static type of the operand of throw and adjusting 501 // the type from "array of T" or "function returning T" to "pointer to T" 502 // or "pointer to function returning T", [...] 503 if (E->getType().hasQualifiers()) 504 E = ImpCastExprToType(E, E->getType().getUnqualifiedType(), CK_NoOp, 505 CastCategory(E)).take(); 506 507 ExprResult Res = DefaultFunctionArrayConversion(E); 508 if (Res.isInvalid()) 509 return ExprError(); 510 E = Res.take(); 511 512 // If the type of the exception would be an incomplete type or a pointer 513 // to an incomplete type other than (cv) void the program is ill-formed. 514 QualType Ty = E->getType(); 515 bool isPointer = false; 516 if (const PointerType* Ptr = Ty->getAs<PointerType>()) { 517 Ty = Ptr->getPointeeType(); 518 isPointer = true; 519 } 520 if (!isPointer || !Ty->isVoidType()) { 521 if (RequireCompleteType(ThrowLoc, Ty, 522 PDiag(isPointer ? diag::err_throw_incomplete_ptr 523 : diag::err_throw_incomplete) 524 << E->getSourceRange())) 525 return ExprError(); 526 527 if (RequireNonAbstractType(ThrowLoc, E->getType(), 528 PDiag(diag::err_throw_abstract_type) 529 << E->getSourceRange())) 530 return ExprError(); 531 } 532 533 // Initialize the exception result. This implicitly weeds out 534 // abstract types or types with inaccessible copy constructors. 535 const VarDecl *NRVOVariable = getCopyElisionCandidate(QualType(), E, false); 536 537 // FIXME: Determine whether we can elide this copy per C++0x [class.copy]p32. 538 InitializedEntity Entity = 539 InitializedEntity::InitializeException(ThrowLoc, E->getType(), 540 /*NRVO=*/false); 541 Res = PerformMoveOrCopyInitialization(Entity, NRVOVariable, 542 QualType(), E); 543 if (Res.isInvalid()) 544 return ExprError(); 545 E = Res.take(); 546 547 // If the exception has class type, we need additional handling. 548 const RecordType *RecordTy = Ty->getAs<RecordType>(); 549 if (!RecordTy) 550 return Owned(E); 551 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 552 553 // If we are throwing a polymorphic class type or pointer thereof, 554 // exception handling will make use of the vtable. 555 MarkVTableUsed(ThrowLoc, RD); 556 557 // If a pointer is thrown, the referenced object will not be destroyed. 558 if (isPointer) 559 return Owned(E); 560 561 // If the class has a non-trivial destructor, we must be able to call it. 562 if (RD->hasTrivialDestructor()) 563 return Owned(E); 564 565 CXXDestructorDecl *Destructor 566 = const_cast<CXXDestructorDecl*>(LookupDestructor(RD)); 567 if (!Destructor) 568 return Owned(E); 569 570 MarkDeclarationReferenced(E->getExprLoc(), Destructor); 571 CheckDestructorAccess(E->getExprLoc(), Destructor, 572 PDiag(diag::err_access_dtor_exception) << Ty); 573 return Owned(E); 574} 575 576CXXMethodDecl *Sema::tryCaptureCXXThis() { 577 // Ignore block scopes: we can capture through them. 578 // Ignore nested enum scopes: we'll diagnose non-constant expressions 579 // where they're invalid, and other uses are legitimate. 580 // Don't ignore nested class scopes: you can't use 'this' in a local class. 581 DeclContext *DC = CurContext; 582 while (true) { 583 if (isa<BlockDecl>(DC)) DC = cast<BlockDecl>(DC)->getDeclContext(); 584 else if (isa<EnumDecl>(DC)) DC = cast<EnumDecl>(DC)->getDeclContext(); 585 else break; 586 } 587 588 // If we're not in an instance method, error out. 589 CXXMethodDecl *method = dyn_cast<CXXMethodDecl>(DC); 590 if (!method || !method->isInstance()) 591 return 0; 592 593 // Mark that we're closing on 'this' in all the block scopes, if applicable. 594 for (unsigned idx = FunctionScopes.size() - 1; 595 isa<BlockScopeInfo>(FunctionScopes[idx]); 596 --idx) 597 cast<BlockScopeInfo>(FunctionScopes[idx])->CapturesCXXThis = true; 598 599 return method; 600} 601 602ExprResult Sema::ActOnCXXThis(SourceLocation loc) { 603 /// C++ 9.3.2: In the body of a non-static member function, the keyword this 604 /// is a non-lvalue expression whose value is the address of the object for 605 /// which the function is called. 606 607 CXXMethodDecl *method = tryCaptureCXXThis(); 608 if (!method) return Diag(loc, diag::err_invalid_this_use); 609 610 return Owned(new (Context) CXXThisExpr(loc, method->getThisType(Context), 611 /*isImplicit=*/false)); 612} 613 614ExprResult 615Sema::ActOnCXXTypeConstructExpr(ParsedType TypeRep, 616 SourceLocation LParenLoc, 617 MultiExprArg exprs, 618 SourceLocation RParenLoc) { 619 if (!TypeRep) 620 return ExprError(); 621 622 TypeSourceInfo *TInfo; 623 QualType Ty = GetTypeFromParser(TypeRep, &TInfo); 624 if (!TInfo) 625 TInfo = Context.getTrivialTypeSourceInfo(Ty, SourceLocation()); 626 627 return BuildCXXTypeConstructExpr(TInfo, LParenLoc, exprs, RParenLoc); 628} 629 630/// ActOnCXXTypeConstructExpr - Parse construction of a specified type. 631/// Can be interpreted either as function-style casting ("int(x)") 632/// or class type construction ("ClassType(x,y,z)") 633/// or creation of a value-initialized type ("int()"). 634ExprResult 635Sema::BuildCXXTypeConstructExpr(TypeSourceInfo *TInfo, 636 SourceLocation LParenLoc, 637 MultiExprArg exprs, 638 SourceLocation RParenLoc) { 639 QualType Ty = TInfo->getType(); 640 unsigned NumExprs = exprs.size(); 641 Expr **Exprs = (Expr**)exprs.get(); 642 SourceLocation TyBeginLoc = TInfo->getTypeLoc().getBeginLoc(); 643 SourceRange FullRange = SourceRange(TyBeginLoc, RParenLoc); 644 645 if (Ty->isDependentType() || 646 CallExpr::hasAnyTypeDependentArguments(Exprs, NumExprs)) { 647 exprs.release(); 648 649 return Owned(CXXUnresolvedConstructExpr::Create(Context, TInfo, 650 LParenLoc, 651 Exprs, NumExprs, 652 RParenLoc)); 653 } 654 655 if (Ty->isArrayType()) 656 return ExprError(Diag(TyBeginLoc, 657 diag::err_value_init_for_array_type) << FullRange); 658 if (!Ty->isVoidType() && 659 RequireCompleteType(TyBeginLoc, Ty, 660 PDiag(diag::err_invalid_incomplete_type_use) 661 << FullRange)) 662 return ExprError(); 663 664 if (RequireNonAbstractType(TyBeginLoc, Ty, 665 diag::err_allocation_of_abstract_type)) 666 return ExprError(); 667 668 669 // C++ [expr.type.conv]p1: 670 // If the expression list is a single expression, the type conversion 671 // expression is equivalent (in definedness, and if defined in meaning) to the 672 // corresponding cast expression. 673 // 674 if (NumExprs == 1) { 675 CastKind Kind = CK_Invalid; 676 ExprValueKind VK = VK_RValue; 677 CXXCastPath BasePath; 678 ExprResult CastExpr = 679 CheckCastTypes(TInfo->getTypeLoc().getSourceRange(), Ty, Exprs[0], 680 Kind, VK, BasePath, 681 /*FunctionalStyle=*/true); 682 if (CastExpr.isInvalid()) 683 return ExprError(); 684 Exprs[0] = CastExpr.take(); 685 686 exprs.release(); 687 688 return Owned(CXXFunctionalCastExpr::Create(Context, 689 Ty.getNonLValueExprType(Context), 690 VK, TInfo, TyBeginLoc, Kind, 691 Exprs[0], &BasePath, 692 RParenLoc)); 693 } 694 695 InitializedEntity Entity = InitializedEntity::InitializeTemporary(TInfo); 696 InitializationKind Kind 697 = NumExprs ? InitializationKind::CreateDirect(TyBeginLoc, 698 LParenLoc, RParenLoc) 699 : InitializationKind::CreateValue(TyBeginLoc, 700 LParenLoc, RParenLoc); 701 InitializationSequence InitSeq(*this, Entity, Kind, Exprs, NumExprs); 702 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(exprs)); 703 704 // FIXME: Improve AST representation? 705 return move(Result); 706} 707 708/// doesUsualArrayDeleteWantSize - Answers whether the usual 709/// operator delete[] for the given type has a size_t parameter. 710static bool doesUsualArrayDeleteWantSize(Sema &S, SourceLocation loc, 711 QualType allocType) { 712 const RecordType *record = 713 allocType->getBaseElementTypeUnsafe()->getAs<RecordType>(); 714 if (!record) return false; 715 716 // Try to find an operator delete[] in class scope. 717 718 DeclarationName deleteName = 719 S.Context.DeclarationNames.getCXXOperatorName(OO_Array_Delete); 720 LookupResult ops(S, deleteName, loc, Sema::LookupOrdinaryName); 721 S.LookupQualifiedName(ops, record->getDecl()); 722 723 // We're just doing this for information. 724 ops.suppressDiagnostics(); 725 726 // Very likely: there's no operator delete[]. 727 if (ops.empty()) return false; 728 729 // If it's ambiguous, it should be illegal to call operator delete[] 730 // on this thing, so it doesn't matter if we allocate extra space or not. 731 if (ops.isAmbiguous()) return false; 732 733 LookupResult::Filter filter = ops.makeFilter(); 734 while (filter.hasNext()) { 735 NamedDecl *del = filter.next()->getUnderlyingDecl(); 736 737 // C++0x [basic.stc.dynamic.deallocation]p2: 738 // A template instance is never a usual deallocation function, 739 // regardless of its signature. 740 if (isa<FunctionTemplateDecl>(del)) { 741 filter.erase(); 742 continue; 743 } 744 745 // C++0x [basic.stc.dynamic.deallocation]p2: 746 // If class T does not declare [an operator delete[] with one 747 // parameter] but does declare a member deallocation function 748 // named operator delete[] with exactly two parameters, the 749 // second of which has type std::size_t, then this function 750 // is a usual deallocation function. 751 if (!cast<CXXMethodDecl>(del)->isUsualDeallocationFunction()) { 752 filter.erase(); 753 continue; 754 } 755 } 756 filter.done(); 757 758 if (!ops.isSingleResult()) return false; 759 760 const FunctionDecl *del = cast<FunctionDecl>(ops.getFoundDecl()); 761 return (del->getNumParams() == 2); 762} 763 764/// ActOnCXXNew - Parsed a C++ 'new' expression (C++ 5.3.4), as in e.g.: 765/// @code new (memory) int[size][4] @endcode 766/// or 767/// @code ::new Foo(23, "hello") @endcode 768/// For the interpretation of this heap of arguments, consult the base version. 769ExprResult 770Sema::ActOnCXXNew(SourceLocation StartLoc, bool UseGlobal, 771 SourceLocation PlacementLParen, MultiExprArg PlacementArgs, 772 SourceLocation PlacementRParen, SourceRange TypeIdParens, 773 Declarator &D, SourceLocation ConstructorLParen, 774 MultiExprArg ConstructorArgs, 775 SourceLocation ConstructorRParen) { 776 bool TypeContainsAuto = D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto; 777 778 Expr *ArraySize = 0; 779 // If the specified type is an array, unwrap it and save the expression. 780 if (D.getNumTypeObjects() > 0 && 781 D.getTypeObject(0).Kind == DeclaratorChunk::Array) { 782 DeclaratorChunk &Chunk = D.getTypeObject(0); 783 if (TypeContainsAuto) 784 return ExprError(Diag(Chunk.Loc, diag::err_new_array_of_auto) 785 << D.getSourceRange()); 786 if (Chunk.Arr.hasStatic) 787 return ExprError(Diag(Chunk.Loc, diag::err_static_illegal_in_new) 788 << D.getSourceRange()); 789 if (!Chunk.Arr.NumElts) 790 return ExprError(Diag(Chunk.Loc, diag::err_array_new_needs_size) 791 << D.getSourceRange()); 792 793 ArraySize = static_cast<Expr*>(Chunk.Arr.NumElts); 794 D.DropFirstTypeObject(); 795 } 796 797 // Every dimension shall be of constant size. 798 if (ArraySize) { 799 for (unsigned I = 0, N = D.getNumTypeObjects(); I < N; ++I) { 800 if (D.getTypeObject(I).Kind != DeclaratorChunk::Array) 801 break; 802 803 DeclaratorChunk::ArrayTypeInfo &Array = D.getTypeObject(I).Arr; 804 if (Expr *NumElts = (Expr *)Array.NumElts) { 805 if (!NumElts->isTypeDependent() && !NumElts->isValueDependent() && 806 !NumElts->isIntegerConstantExpr(Context)) { 807 Diag(D.getTypeObject(I).Loc, diag::err_new_array_nonconst) 808 << NumElts->getSourceRange(); 809 return ExprError(); 810 } 811 } 812 } 813 } 814 815 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, /*Scope=*/0, /*OwnedDecl=*/0, 816 /*AllowAuto=*/true); 817 QualType AllocType = TInfo->getType(); 818 if (D.isInvalidType()) 819 return ExprError(); 820 821 return BuildCXXNew(StartLoc, UseGlobal, 822 PlacementLParen, 823 move(PlacementArgs), 824 PlacementRParen, 825 TypeIdParens, 826 AllocType, 827 TInfo, 828 ArraySize, 829 ConstructorLParen, 830 move(ConstructorArgs), 831 ConstructorRParen, 832 TypeContainsAuto); 833} 834 835ExprResult 836Sema::BuildCXXNew(SourceLocation StartLoc, bool UseGlobal, 837 SourceLocation PlacementLParen, 838 MultiExprArg PlacementArgs, 839 SourceLocation PlacementRParen, 840 SourceRange TypeIdParens, 841 QualType AllocType, 842 TypeSourceInfo *AllocTypeInfo, 843 Expr *ArraySize, 844 SourceLocation ConstructorLParen, 845 MultiExprArg ConstructorArgs, 846 SourceLocation ConstructorRParen, 847 bool TypeMayContainAuto) { 848 SourceRange TypeRange = AllocTypeInfo->getTypeLoc().getSourceRange(); 849 850 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 851 if (TypeMayContainAuto && AllocType->getContainedAutoType()) { 852 if (ConstructorArgs.size() == 0) 853 return ExprError(Diag(StartLoc, diag::err_auto_new_requires_ctor_arg) 854 << AllocType << TypeRange); 855 if (ConstructorArgs.size() != 1) { 856 Expr *FirstBad = ConstructorArgs.get()[1]; 857 return ExprError(Diag(FirstBad->getSourceRange().getBegin(), 858 diag::err_auto_new_ctor_multiple_expressions) 859 << AllocType << TypeRange); 860 } 861 TypeSourceInfo *DeducedType = 0; 862 if (!DeduceAutoType(AllocTypeInfo, ConstructorArgs.get()[0], DeducedType)) 863 return ExprError(Diag(StartLoc, diag::err_auto_new_deduction_failure) 864 << AllocType 865 << ConstructorArgs.get()[0]->getType() 866 << TypeRange 867 << ConstructorArgs.get()[0]->getSourceRange()); 868 if (!DeducedType) 869 return ExprError(); 870 871 AllocTypeInfo = DeducedType; 872 AllocType = AllocTypeInfo->getType(); 873 } 874 875 // Per C++0x [expr.new]p5, the type being constructed may be a 876 // typedef of an array type. 877 if (!ArraySize) { 878 if (const ConstantArrayType *Array 879 = Context.getAsConstantArrayType(AllocType)) { 880 ArraySize = IntegerLiteral::Create(Context, Array->getSize(), 881 Context.getSizeType(), 882 TypeRange.getEnd()); 883 AllocType = Array->getElementType(); 884 } 885 } 886 887 if (CheckAllocatedType(AllocType, TypeRange.getBegin(), TypeRange)) 888 return ExprError(); 889 890 QualType ResultType = Context.getPointerType(AllocType); 891 892 // C++ 5.3.4p6: "The expression in a direct-new-declarator shall have integral 893 // or enumeration type with a non-negative value." 894 if (ArraySize && !ArraySize->isTypeDependent()) { 895 896 QualType SizeType = ArraySize->getType(); 897 898 ExprResult ConvertedSize 899 = ConvertToIntegralOrEnumerationType(StartLoc, ArraySize, 900 PDiag(diag::err_array_size_not_integral), 901 PDiag(diag::err_array_size_incomplete_type) 902 << ArraySize->getSourceRange(), 903 PDiag(diag::err_array_size_explicit_conversion), 904 PDiag(diag::note_array_size_conversion), 905 PDiag(diag::err_array_size_ambiguous_conversion), 906 PDiag(diag::note_array_size_conversion), 907 PDiag(getLangOptions().CPlusPlus0x? 0 908 : diag::ext_array_size_conversion)); 909 if (ConvertedSize.isInvalid()) 910 return ExprError(); 911 912 ArraySize = ConvertedSize.take(); 913 SizeType = ArraySize->getType(); 914 if (!SizeType->isIntegralOrUnscopedEnumerationType()) 915 return ExprError(); 916 917 // Let's see if this is a constant < 0. If so, we reject it out of hand. 918 // We don't care about special rules, so we tell the machinery it's not 919 // evaluated - it gives us a result in more cases. 920 if (!ArraySize->isValueDependent()) { 921 llvm::APSInt Value; 922 if (ArraySize->isIntegerConstantExpr(Value, Context, 0, false)) { 923 if (Value < llvm::APSInt( 924 llvm::APInt::getNullValue(Value.getBitWidth()), 925 Value.isUnsigned())) 926 return ExprError(Diag(ArraySize->getSourceRange().getBegin(), 927 diag::err_typecheck_negative_array_size) 928 << ArraySize->getSourceRange()); 929 930 if (!AllocType->isDependentType()) { 931 unsigned ActiveSizeBits 932 = ConstantArrayType::getNumAddressingBits(Context, AllocType, Value); 933 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 934 Diag(ArraySize->getSourceRange().getBegin(), 935 diag::err_array_too_large) 936 << Value.toString(10) 937 << ArraySize->getSourceRange(); 938 return ExprError(); 939 } 940 } 941 } else if (TypeIdParens.isValid()) { 942 // Can't have dynamic array size when the type-id is in parentheses. 943 Diag(ArraySize->getLocStart(), diag::ext_new_paren_array_nonconst) 944 << ArraySize->getSourceRange() 945 << FixItHint::CreateRemoval(TypeIdParens.getBegin()) 946 << FixItHint::CreateRemoval(TypeIdParens.getEnd()); 947 948 TypeIdParens = SourceRange(); 949 } 950 } 951 952 ArraySize = ImpCastExprToType(ArraySize, Context.getSizeType(), 953 CK_IntegralCast).take(); 954 } 955 956 FunctionDecl *OperatorNew = 0; 957 FunctionDecl *OperatorDelete = 0; 958 Expr **PlaceArgs = (Expr**)PlacementArgs.get(); 959 unsigned NumPlaceArgs = PlacementArgs.size(); 960 961 if (!AllocType->isDependentType() && 962 !Expr::hasAnyTypeDependentArguments(PlaceArgs, NumPlaceArgs) && 963 FindAllocationFunctions(StartLoc, 964 SourceRange(PlacementLParen, PlacementRParen), 965 UseGlobal, AllocType, ArraySize, PlaceArgs, 966 NumPlaceArgs, OperatorNew, OperatorDelete)) 967 return ExprError(); 968 969 // If this is an array allocation, compute whether the usual array 970 // deallocation function for the type has a size_t parameter. 971 bool UsualArrayDeleteWantsSize = false; 972 if (ArraySize && !AllocType->isDependentType()) 973 UsualArrayDeleteWantsSize 974 = doesUsualArrayDeleteWantSize(*this, StartLoc, AllocType); 975 976 llvm::SmallVector<Expr *, 8> AllPlaceArgs; 977 if (OperatorNew) { 978 // Add default arguments, if any. 979 const FunctionProtoType *Proto = 980 OperatorNew->getType()->getAs<FunctionProtoType>(); 981 VariadicCallType CallType = 982 Proto->isVariadic() ? VariadicFunction : VariadicDoesNotApply; 983 984 if (GatherArgumentsForCall(PlacementLParen, OperatorNew, 985 Proto, 1, PlaceArgs, NumPlaceArgs, 986 AllPlaceArgs, CallType)) 987 return ExprError(); 988 989 NumPlaceArgs = AllPlaceArgs.size(); 990 if (NumPlaceArgs > 0) 991 PlaceArgs = &AllPlaceArgs[0]; 992 } 993 994 bool Init = ConstructorLParen.isValid(); 995 // --- Choosing a constructor --- 996 CXXConstructorDecl *Constructor = 0; 997 Expr **ConsArgs = (Expr**)ConstructorArgs.get(); 998 unsigned NumConsArgs = ConstructorArgs.size(); 999 ASTOwningVector<Expr*> ConvertedConstructorArgs(*this); 1000 1001 // Array 'new' can't have any initializers. 1002 if (NumConsArgs && (ResultType->isArrayType() || ArraySize)) { 1003 SourceRange InitRange(ConsArgs[0]->getLocStart(), 1004 ConsArgs[NumConsArgs - 1]->getLocEnd()); 1005 1006 Diag(StartLoc, diag::err_new_array_init_args) << InitRange; 1007 return ExprError(); 1008 } 1009 1010 if (!AllocType->isDependentType() && 1011 !Expr::hasAnyTypeDependentArguments(ConsArgs, NumConsArgs)) { 1012 // C++0x [expr.new]p15: 1013 // A new-expression that creates an object of type T initializes that 1014 // object as follows: 1015 InitializationKind Kind 1016 // - If the new-initializer is omitted, the object is default- 1017 // initialized (8.5); if no initialization is performed, 1018 // the object has indeterminate value 1019 = !Init? InitializationKind::CreateDefault(TypeRange.getBegin()) 1020 // - Otherwise, the new-initializer is interpreted according to the 1021 // initialization rules of 8.5 for direct-initialization. 1022 : InitializationKind::CreateDirect(TypeRange.getBegin(), 1023 ConstructorLParen, 1024 ConstructorRParen); 1025 1026 InitializedEntity Entity 1027 = InitializedEntity::InitializeNew(StartLoc, AllocType); 1028 InitializationSequence InitSeq(*this, Entity, Kind, ConsArgs, NumConsArgs); 1029 ExprResult FullInit = InitSeq.Perform(*this, Entity, Kind, 1030 move(ConstructorArgs)); 1031 if (FullInit.isInvalid()) 1032 return ExprError(); 1033 1034 // FullInit is our initializer; walk through it to determine if it's a 1035 // constructor call, which CXXNewExpr handles directly. 1036 if (Expr *FullInitExpr = (Expr *)FullInit.get()) { 1037 if (CXXBindTemporaryExpr *Binder 1038 = dyn_cast<CXXBindTemporaryExpr>(FullInitExpr)) 1039 FullInitExpr = Binder->getSubExpr(); 1040 if (CXXConstructExpr *Construct 1041 = dyn_cast<CXXConstructExpr>(FullInitExpr)) { 1042 Constructor = Construct->getConstructor(); 1043 for (CXXConstructExpr::arg_iterator A = Construct->arg_begin(), 1044 AEnd = Construct->arg_end(); 1045 A != AEnd; ++A) 1046 ConvertedConstructorArgs.push_back(*A); 1047 } else { 1048 // Take the converted initializer. 1049 ConvertedConstructorArgs.push_back(FullInit.release()); 1050 } 1051 } else { 1052 // No initialization required. 1053 } 1054 1055 // Take the converted arguments and use them for the new expression. 1056 NumConsArgs = ConvertedConstructorArgs.size(); 1057 ConsArgs = (Expr **)ConvertedConstructorArgs.take(); 1058 } 1059 1060 // Mark the new and delete operators as referenced. 1061 if (OperatorNew) 1062 MarkDeclarationReferenced(StartLoc, OperatorNew); 1063 if (OperatorDelete) 1064 MarkDeclarationReferenced(StartLoc, OperatorDelete); 1065 1066 // FIXME: Also check that the destructor is accessible. (C++ 5.3.4p16) 1067 1068 PlacementArgs.release(); 1069 ConstructorArgs.release(); 1070 1071 return Owned(new (Context) CXXNewExpr(Context, UseGlobal, OperatorNew, 1072 PlaceArgs, NumPlaceArgs, TypeIdParens, 1073 ArraySize, Constructor, Init, 1074 ConsArgs, NumConsArgs, OperatorDelete, 1075 UsualArrayDeleteWantsSize, 1076 ResultType, AllocTypeInfo, 1077 StartLoc, 1078 Init ? ConstructorRParen : 1079 TypeRange.getEnd(), 1080 ConstructorLParen, ConstructorRParen)); 1081} 1082 1083/// CheckAllocatedType - Checks that a type is suitable as the allocated type 1084/// in a new-expression. 1085/// dimension off and stores the size expression in ArraySize. 1086bool Sema::CheckAllocatedType(QualType AllocType, SourceLocation Loc, 1087 SourceRange R) { 1088 // C++ 5.3.4p1: "[The] type shall be a complete object type, but not an 1089 // abstract class type or array thereof. 1090 if (AllocType->isFunctionType()) 1091 return Diag(Loc, diag::err_bad_new_type) 1092 << AllocType << 0 << R; 1093 else if (AllocType->isReferenceType()) 1094 return Diag(Loc, diag::err_bad_new_type) 1095 << AllocType << 1 << R; 1096 else if (!AllocType->isDependentType() && 1097 RequireCompleteType(Loc, AllocType, 1098 PDiag(diag::err_new_incomplete_type) 1099 << R)) 1100 return true; 1101 else if (RequireNonAbstractType(Loc, AllocType, 1102 diag::err_allocation_of_abstract_type)) 1103 return true; 1104 else if (AllocType->isVariablyModifiedType()) 1105 return Diag(Loc, diag::err_variably_modified_new_type) 1106 << AllocType; 1107 1108 return false; 1109} 1110 1111/// \brief Determine whether the given function is a non-placement 1112/// deallocation function. 1113static bool isNonPlacementDeallocationFunction(FunctionDecl *FD) { 1114 if (FD->isInvalidDecl()) 1115 return false; 1116 1117 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FD)) 1118 return Method->isUsualDeallocationFunction(); 1119 1120 return ((FD->getOverloadedOperator() == OO_Delete || 1121 FD->getOverloadedOperator() == OO_Array_Delete) && 1122 FD->getNumParams() == 1); 1123} 1124 1125/// FindAllocationFunctions - Finds the overloads of operator new and delete 1126/// that are appropriate for the allocation. 1127bool Sema::FindAllocationFunctions(SourceLocation StartLoc, SourceRange Range, 1128 bool UseGlobal, QualType AllocType, 1129 bool IsArray, Expr **PlaceArgs, 1130 unsigned NumPlaceArgs, 1131 FunctionDecl *&OperatorNew, 1132 FunctionDecl *&OperatorDelete) { 1133 // --- Choosing an allocation function --- 1134 // C++ 5.3.4p8 - 14 & 18 1135 // 1) If UseGlobal is true, only look in the global scope. Else, also look 1136 // in the scope of the allocated class. 1137 // 2) If an array size is given, look for operator new[], else look for 1138 // operator new. 1139 // 3) The first argument is always size_t. Append the arguments from the 1140 // placement form. 1141 1142 llvm::SmallVector<Expr*, 8> AllocArgs(1 + NumPlaceArgs); 1143 // We don't care about the actual value of this argument. 1144 // FIXME: Should the Sema create the expression and embed it in the syntax 1145 // tree? Or should the consumer just recalculate the value? 1146 IntegerLiteral Size(Context, llvm::APInt::getNullValue( 1147 Context.Target.getPointerWidth(0)), 1148 Context.getSizeType(), 1149 SourceLocation()); 1150 AllocArgs[0] = &Size; 1151 std::copy(PlaceArgs, PlaceArgs + NumPlaceArgs, AllocArgs.begin() + 1); 1152 1153 // C++ [expr.new]p8: 1154 // If the allocated type is a non-array type, the allocation 1155 // function's name is operator new and the deallocation function's 1156 // name is operator delete. If the allocated type is an array 1157 // type, the allocation function's name is operator new[] and the 1158 // deallocation function's name is operator delete[]. 1159 DeclarationName NewName = Context.DeclarationNames.getCXXOperatorName( 1160 IsArray ? OO_Array_New : OO_New); 1161 DeclarationName DeleteName = Context.DeclarationNames.getCXXOperatorName( 1162 IsArray ? OO_Array_Delete : OO_Delete); 1163 1164 QualType AllocElemType = Context.getBaseElementType(AllocType); 1165 1166 if (AllocElemType->isRecordType() && !UseGlobal) { 1167 CXXRecordDecl *Record 1168 = cast<CXXRecordDecl>(AllocElemType->getAs<RecordType>()->getDecl()); 1169 if (FindAllocationOverload(StartLoc, Range, NewName, &AllocArgs[0], 1170 AllocArgs.size(), Record, /*AllowMissing=*/true, 1171 OperatorNew)) 1172 return true; 1173 } 1174 if (!OperatorNew) { 1175 // Didn't find a member overload. Look for a global one. 1176 DeclareGlobalNewDelete(); 1177 DeclContext *TUDecl = Context.getTranslationUnitDecl(); 1178 if (FindAllocationOverload(StartLoc, Range, NewName, &AllocArgs[0], 1179 AllocArgs.size(), TUDecl, /*AllowMissing=*/false, 1180 OperatorNew)) 1181 return true; 1182 } 1183 1184 // We don't need an operator delete if we're running under 1185 // -fno-exceptions. 1186 if (!getLangOptions().Exceptions) { 1187 OperatorDelete = 0; 1188 return false; 1189 } 1190 1191 // FindAllocationOverload can change the passed in arguments, so we need to 1192 // copy them back. 1193 if (NumPlaceArgs > 0) 1194 std::copy(&AllocArgs[1], AllocArgs.end(), PlaceArgs); 1195 1196 // C++ [expr.new]p19: 1197 // 1198 // If the new-expression begins with a unary :: operator, the 1199 // deallocation function's name is looked up in the global 1200 // scope. Otherwise, if the allocated type is a class type T or an 1201 // array thereof, the deallocation function's name is looked up in 1202 // the scope of T. If this lookup fails to find the name, or if 1203 // the allocated type is not a class type or array thereof, the 1204 // deallocation function's name is looked up in the global scope. 1205 LookupResult FoundDelete(*this, DeleteName, StartLoc, LookupOrdinaryName); 1206 if (AllocElemType->isRecordType() && !UseGlobal) { 1207 CXXRecordDecl *RD 1208 = cast<CXXRecordDecl>(AllocElemType->getAs<RecordType>()->getDecl()); 1209 LookupQualifiedName(FoundDelete, RD); 1210 } 1211 if (FoundDelete.isAmbiguous()) 1212 return true; // FIXME: clean up expressions? 1213 1214 if (FoundDelete.empty()) { 1215 DeclareGlobalNewDelete(); 1216 LookupQualifiedName(FoundDelete, Context.getTranslationUnitDecl()); 1217 } 1218 1219 FoundDelete.suppressDiagnostics(); 1220 1221 llvm::SmallVector<std::pair<DeclAccessPair,FunctionDecl*>, 2> Matches; 1222 1223 // Whether we're looking for a placement operator delete is dictated 1224 // by whether we selected a placement operator new, not by whether 1225 // we had explicit placement arguments. This matters for things like 1226 // struct A { void *operator new(size_t, int = 0); ... }; 1227 // A *a = new A() 1228 bool isPlacementNew = (NumPlaceArgs > 0 || OperatorNew->param_size() != 1); 1229 1230 if (isPlacementNew) { 1231 // C++ [expr.new]p20: 1232 // A declaration of a placement deallocation function matches the 1233 // declaration of a placement allocation function if it has the 1234 // same number of parameters and, after parameter transformations 1235 // (8.3.5), all parameter types except the first are 1236 // identical. [...] 1237 // 1238 // To perform this comparison, we compute the function type that 1239 // the deallocation function should have, and use that type both 1240 // for template argument deduction and for comparison purposes. 1241 // 1242 // FIXME: this comparison should ignore CC and the like. 1243 QualType ExpectedFunctionType; 1244 { 1245 const FunctionProtoType *Proto 1246 = OperatorNew->getType()->getAs<FunctionProtoType>(); 1247 1248 llvm::SmallVector<QualType, 4> ArgTypes; 1249 ArgTypes.push_back(Context.VoidPtrTy); 1250 for (unsigned I = 1, N = Proto->getNumArgs(); I < N; ++I) 1251 ArgTypes.push_back(Proto->getArgType(I)); 1252 1253 FunctionProtoType::ExtProtoInfo EPI; 1254 EPI.Variadic = Proto->isVariadic(); 1255 1256 ExpectedFunctionType 1257 = Context.getFunctionType(Context.VoidTy, ArgTypes.data(), 1258 ArgTypes.size(), EPI); 1259 } 1260 1261 for (LookupResult::iterator D = FoundDelete.begin(), 1262 DEnd = FoundDelete.end(); 1263 D != DEnd; ++D) { 1264 FunctionDecl *Fn = 0; 1265 if (FunctionTemplateDecl *FnTmpl 1266 = dyn_cast<FunctionTemplateDecl>((*D)->getUnderlyingDecl())) { 1267 // Perform template argument deduction to try to match the 1268 // expected function type. 1269 TemplateDeductionInfo Info(Context, StartLoc); 1270 if (DeduceTemplateArguments(FnTmpl, 0, ExpectedFunctionType, Fn, Info)) 1271 continue; 1272 } else 1273 Fn = cast<FunctionDecl>((*D)->getUnderlyingDecl()); 1274 1275 if (Context.hasSameType(Fn->getType(), ExpectedFunctionType)) 1276 Matches.push_back(std::make_pair(D.getPair(), Fn)); 1277 } 1278 } else { 1279 // C++ [expr.new]p20: 1280 // [...] Any non-placement deallocation function matches a 1281 // non-placement allocation function. [...] 1282 for (LookupResult::iterator D = FoundDelete.begin(), 1283 DEnd = FoundDelete.end(); 1284 D != DEnd; ++D) { 1285 if (FunctionDecl *Fn = dyn_cast<FunctionDecl>((*D)->getUnderlyingDecl())) 1286 if (isNonPlacementDeallocationFunction(Fn)) 1287 Matches.push_back(std::make_pair(D.getPair(), Fn)); 1288 } 1289 } 1290 1291 // C++ [expr.new]p20: 1292 // [...] If the lookup finds a single matching deallocation 1293 // function, that function will be called; otherwise, no 1294 // deallocation function will be called. 1295 if (Matches.size() == 1) { 1296 OperatorDelete = Matches[0].second; 1297 1298 // C++0x [expr.new]p20: 1299 // If the lookup finds the two-parameter form of a usual 1300 // deallocation function (3.7.4.2) and that function, considered 1301 // as a placement deallocation function, would have been 1302 // selected as a match for the allocation function, the program 1303 // is ill-formed. 1304 if (NumPlaceArgs && getLangOptions().CPlusPlus0x && 1305 isNonPlacementDeallocationFunction(OperatorDelete)) { 1306 Diag(StartLoc, diag::err_placement_new_non_placement_delete) 1307 << SourceRange(PlaceArgs[0]->getLocStart(), 1308 PlaceArgs[NumPlaceArgs - 1]->getLocEnd()); 1309 Diag(OperatorDelete->getLocation(), diag::note_previous_decl) 1310 << DeleteName; 1311 } else { 1312 CheckAllocationAccess(StartLoc, Range, FoundDelete.getNamingClass(), 1313 Matches[0].first); 1314 } 1315 } 1316 1317 return false; 1318} 1319 1320/// FindAllocationOverload - Find an fitting overload for the allocation 1321/// function in the specified scope. 1322bool Sema::FindAllocationOverload(SourceLocation StartLoc, SourceRange Range, 1323 DeclarationName Name, Expr** Args, 1324 unsigned NumArgs, DeclContext *Ctx, 1325 bool AllowMissing, FunctionDecl *&Operator) { 1326 LookupResult R(*this, Name, StartLoc, LookupOrdinaryName); 1327 LookupQualifiedName(R, Ctx); 1328 if (R.empty()) { 1329 if (AllowMissing) 1330 return false; 1331 return Diag(StartLoc, diag::err_ovl_no_viable_function_in_call) 1332 << Name << Range; 1333 } 1334 1335 if (R.isAmbiguous()) 1336 return true; 1337 1338 R.suppressDiagnostics(); 1339 1340 OverloadCandidateSet Candidates(StartLoc); 1341 for (LookupResult::iterator Alloc = R.begin(), AllocEnd = R.end(); 1342 Alloc != AllocEnd; ++Alloc) { 1343 // Even member operator new/delete are implicitly treated as 1344 // static, so don't use AddMemberCandidate. 1345 NamedDecl *D = (*Alloc)->getUnderlyingDecl(); 1346 1347 if (FunctionTemplateDecl *FnTemplate = dyn_cast<FunctionTemplateDecl>(D)) { 1348 AddTemplateOverloadCandidate(FnTemplate, Alloc.getPair(), 1349 /*ExplicitTemplateArgs=*/0, Args, NumArgs, 1350 Candidates, 1351 /*SuppressUserConversions=*/false); 1352 continue; 1353 } 1354 1355 FunctionDecl *Fn = cast<FunctionDecl>(D); 1356 AddOverloadCandidate(Fn, Alloc.getPair(), Args, NumArgs, Candidates, 1357 /*SuppressUserConversions=*/false); 1358 } 1359 1360 // Do the resolution. 1361 OverloadCandidateSet::iterator Best; 1362 switch (Candidates.BestViableFunction(*this, StartLoc, Best)) { 1363 case OR_Success: { 1364 // Got one! 1365 FunctionDecl *FnDecl = Best->Function; 1366 MarkDeclarationReferenced(StartLoc, FnDecl); 1367 // The first argument is size_t, and the first parameter must be size_t, 1368 // too. This is checked on declaration and can be assumed. (It can't be 1369 // asserted on, though, since invalid decls are left in there.) 1370 // Watch out for variadic allocator function. 1371 unsigned NumArgsInFnDecl = FnDecl->getNumParams(); 1372 for (unsigned i = 0; (i < NumArgs && i < NumArgsInFnDecl); ++i) { 1373 ExprResult Result 1374 = PerformCopyInitialization(InitializedEntity::InitializeParameter( 1375 Context, 1376 FnDecl->getParamDecl(i)), 1377 SourceLocation(), 1378 Owned(Args[i])); 1379 if (Result.isInvalid()) 1380 return true; 1381 1382 Args[i] = Result.takeAs<Expr>(); 1383 } 1384 Operator = FnDecl; 1385 CheckAllocationAccess(StartLoc, Range, R.getNamingClass(), Best->FoundDecl); 1386 return false; 1387 } 1388 1389 case OR_No_Viable_Function: 1390 Diag(StartLoc, diag::err_ovl_no_viable_function_in_call) 1391 << Name << Range; 1392 Candidates.NoteCandidates(*this, OCD_AllCandidates, Args, NumArgs); 1393 return true; 1394 1395 case OR_Ambiguous: 1396 Diag(StartLoc, diag::err_ovl_ambiguous_call) 1397 << Name << Range; 1398 Candidates.NoteCandidates(*this, OCD_ViableCandidates, Args, NumArgs); 1399 return true; 1400 1401 case OR_Deleted: { 1402 Diag(StartLoc, diag::err_ovl_deleted_call) 1403 << Best->Function->isDeleted() 1404 << Name 1405 << getDeletedOrUnavailableSuffix(Best->Function) 1406 << Range; 1407 Candidates.NoteCandidates(*this, OCD_AllCandidates, Args, NumArgs); 1408 return true; 1409 } 1410 } 1411 assert(false && "Unreachable, bad result from BestViableFunction"); 1412 return true; 1413} 1414 1415 1416/// DeclareGlobalNewDelete - Declare the global forms of operator new and 1417/// delete. These are: 1418/// @code 1419/// // C++03: 1420/// void* operator new(std::size_t) throw(std::bad_alloc); 1421/// void* operator new[](std::size_t) throw(std::bad_alloc); 1422/// void operator delete(void *) throw(); 1423/// void operator delete[](void *) throw(); 1424/// // C++0x: 1425/// void* operator new(std::size_t); 1426/// void* operator new[](std::size_t); 1427/// void operator delete(void *); 1428/// void operator delete[](void *); 1429/// @endcode 1430/// C++0x operator delete is implicitly noexcept. 1431/// Note that the placement and nothrow forms of new are *not* implicitly 1432/// declared. Their use requires including \<new\>. 1433void Sema::DeclareGlobalNewDelete() { 1434 if (GlobalNewDeleteDeclared) 1435 return; 1436 1437 // C++ [basic.std.dynamic]p2: 1438 // [...] The following allocation and deallocation functions (18.4) are 1439 // implicitly declared in global scope in each translation unit of a 1440 // program 1441 // 1442 // C++03: 1443 // void* operator new(std::size_t) throw(std::bad_alloc); 1444 // void* operator new[](std::size_t) throw(std::bad_alloc); 1445 // void operator delete(void*) throw(); 1446 // void operator delete[](void*) throw(); 1447 // C++0x: 1448 // void* operator new(std::size_t); 1449 // void* operator new[](std::size_t); 1450 // void operator delete(void*); 1451 // void operator delete[](void*); 1452 // 1453 // These implicit declarations introduce only the function names operator 1454 // new, operator new[], operator delete, operator delete[]. 1455 // 1456 // Here, we need to refer to std::bad_alloc, so we will implicitly declare 1457 // "std" or "bad_alloc" as necessary to form the exception specification. 1458 // However, we do not make these implicit declarations visible to name 1459 // lookup. 1460 // Note that the C++0x versions of operator delete are deallocation functions, 1461 // and thus are implicitly noexcept. 1462 if (!StdBadAlloc && !getLangOptions().CPlusPlus0x) { 1463 // The "std::bad_alloc" class has not yet been declared, so build it 1464 // implicitly. 1465 StdBadAlloc = CXXRecordDecl::Create(Context, TTK_Class, 1466 getOrCreateStdNamespace(), 1467 SourceLocation(), SourceLocation(), 1468 &PP.getIdentifierTable().get("bad_alloc"), 1469 0); 1470 getStdBadAlloc()->setImplicit(true); 1471 } 1472 1473 GlobalNewDeleteDeclared = true; 1474 1475 QualType VoidPtr = Context.getPointerType(Context.VoidTy); 1476 QualType SizeT = Context.getSizeType(); 1477 bool AssumeSaneOperatorNew = getLangOptions().AssumeSaneOperatorNew; 1478 1479 DeclareGlobalAllocationFunction( 1480 Context.DeclarationNames.getCXXOperatorName(OO_New), 1481 VoidPtr, SizeT, AssumeSaneOperatorNew); 1482 DeclareGlobalAllocationFunction( 1483 Context.DeclarationNames.getCXXOperatorName(OO_Array_New), 1484 VoidPtr, SizeT, AssumeSaneOperatorNew); 1485 DeclareGlobalAllocationFunction( 1486 Context.DeclarationNames.getCXXOperatorName(OO_Delete), 1487 Context.VoidTy, VoidPtr); 1488 DeclareGlobalAllocationFunction( 1489 Context.DeclarationNames.getCXXOperatorName(OO_Array_Delete), 1490 Context.VoidTy, VoidPtr); 1491} 1492 1493/// DeclareGlobalAllocationFunction - Declares a single implicit global 1494/// allocation function if it doesn't already exist. 1495void Sema::DeclareGlobalAllocationFunction(DeclarationName Name, 1496 QualType Return, QualType Argument, 1497 bool AddMallocAttr) { 1498 DeclContext *GlobalCtx = Context.getTranslationUnitDecl(); 1499 1500 // Check if this function is already declared. 1501 { 1502 DeclContext::lookup_iterator Alloc, AllocEnd; 1503 for (llvm::tie(Alloc, AllocEnd) = GlobalCtx->lookup(Name); 1504 Alloc != AllocEnd; ++Alloc) { 1505 // Only look at non-template functions, as it is the predefined, 1506 // non-templated allocation function we are trying to declare here. 1507 if (FunctionDecl *Func = dyn_cast<FunctionDecl>(*Alloc)) { 1508 QualType InitialParamType = 1509 Context.getCanonicalType( 1510 Func->getParamDecl(0)->getType().getUnqualifiedType()); 1511 // FIXME: Do we need to check for default arguments here? 1512 if (Func->getNumParams() == 1 && InitialParamType == Argument) { 1513 if(AddMallocAttr && !Func->hasAttr<MallocAttr>()) 1514 Func->addAttr(::new (Context) MallocAttr(SourceLocation(), Context)); 1515 return; 1516 } 1517 } 1518 } 1519 } 1520 1521 QualType BadAllocType; 1522 bool HasBadAllocExceptionSpec 1523 = (Name.getCXXOverloadedOperator() == OO_New || 1524 Name.getCXXOverloadedOperator() == OO_Array_New); 1525 if (HasBadAllocExceptionSpec && !getLangOptions().CPlusPlus0x) { 1526 assert(StdBadAlloc && "Must have std::bad_alloc declared"); 1527 BadAllocType = Context.getTypeDeclType(getStdBadAlloc()); 1528 } 1529 1530 FunctionProtoType::ExtProtoInfo EPI; 1531 if (HasBadAllocExceptionSpec) { 1532 if (!getLangOptions().CPlusPlus0x) { 1533 EPI.ExceptionSpecType = EST_Dynamic; 1534 EPI.NumExceptions = 1; 1535 EPI.Exceptions = &BadAllocType; 1536 } 1537 } else { 1538 EPI.ExceptionSpecType = getLangOptions().CPlusPlus0x ? 1539 EST_BasicNoexcept : EST_DynamicNone; 1540 } 1541 1542 QualType FnType = Context.getFunctionType(Return, &Argument, 1, EPI); 1543 FunctionDecl *Alloc = 1544 FunctionDecl::Create(Context, GlobalCtx, SourceLocation(), 1545 SourceLocation(), Name, 1546 FnType, /*TInfo=*/0, SC_None, 1547 SC_None, false, true); 1548 Alloc->setImplicit(); 1549 1550 if (AddMallocAttr) 1551 Alloc->addAttr(::new (Context) MallocAttr(SourceLocation(), Context)); 1552 1553 ParmVarDecl *Param = ParmVarDecl::Create(Context, Alloc, SourceLocation(), 1554 SourceLocation(), 0, 1555 Argument, /*TInfo=*/0, 1556 SC_None, SC_None, 0); 1557 Alloc->setParams(&Param, 1); 1558 1559 // FIXME: Also add this declaration to the IdentifierResolver, but 1560 // make sure it is at the end of the chain to coincide with the 1561 // global scope. 1562 Context.getTranslationUnitDecl()->addDecl(Alloc); 1563} 1564 1565bool Sema::FindDeallocationFunction(SourceLocation StartLoc, CXXRecordDecl *RD, 1566 DeclarationName Name, 1567 FunctionDecl* &Operator) { 1568 LookupResult Found(*this, Name, StartLoc, LookupOrdinaryName); 1569 // Try to find operator delete/operator delete[] in class scope. 1570 LookupQualifiedName(Found, RD); 1571 1572 if (Found.isAmbiguous()) 1573 return true; 1574 1575 Found.suppressDiagnostics(); 1576 1577 llvm::SmallVector<DeclAccessPair,4> Matches; 1578 for (LookupResult::iterator F = Found.begin(), FEnd = Found.end(); 1579 F != FEnd; ++F) { 1580 NamedDecl *ND = (*F)->getUnderlyingDecl(); 1581 1582 // Ignore template operator delete members from the check for a usual 1583 // deallocation function. 1584 if (isa<FunctionTemplateDecl>(ND)) 1585 continue; 1586 1587 if (cast<CXXMethodDecl>(ND)->isUsualDeallocationFunction()) 1588 Matches.push_back(F.getPair()); 1589 } 1590 1591 // There's exactly one suitable operator; pick it. 1592 if (Matches.size() == 1) { 1593 Operator = cast<CXXMethodDecl>(Matches[0]->getUnderlyingDecl()); 1594 CheckAllocationAccess(StartLoc, SourceRange(), Found.getNamingClass(), 1595 Matches[0]); 1596 return false; 1597 1598 // We found multiple suitable operators; complain about the ambiguity. 1599 } else if (!Matches.empty()) { 1600 Diag(StartLoc, diag::err_ambiguous_suitable_delete_member_function_found) 1601 << Name << RD; 1602 1603 for (llvm::SmallVectorImpl<DeclAccessPair>::iterator 1604 F = Matches.begin(), FEnd = Matches.end(); F != FEnd; ++F) 1605 Diag((*F)->getUnderlyingDecl()->getLocation(), 1606 diag::note_member_declared_here) << Name; 1607 return true; 1608 } 1609 1610 // We did find operator delete/operator delete[] declarations, but 1611 // none of them were suitable. 1612 if (!Found.empty()) { 1613 Diag(StartLoc, diag::err_no_suitable_delete_member_function_found) 1614 << Name << RD; 1615 1616 for (LookupResult::iterator F = Found.begin(), FEnd = Found.end(); 1617 F != FEnd; ++F) 1618 Diag((*F)->getUnderlyingDecl()->getLocation(), 1619 diag::note_member_declared_here) << Name; 1620 1621 return true; 1622 } 1623 1624 // Look for a global declaration. 1625 DeclareGlobalNewDelete(); 1626 DeclContext *TUDecl = Context.getTranslationUnitDecl(); 1627 1628 CXXNullPtrLiteralExpr Null(Context.VoidPtrTy, SourceLocation()); 1629 Expr* DeallocArgs[1]; 1630 DeallocArgs[0] = &Null; 1631 if (FindAllocationOverload(StartLoc, SourceRange(), Name, 1632 DeallocArgs, 1, TUDecl, /*AllowMissing=*/false, 1633 Operator)) 1634 return true; 1635 1636 assert(Operator && "Did not find a deallocation function!"); 1637 return false; 1638} 1639 1640/// ActOnCXXDelete - Parsed a C++ 'delete' expression (C++ 5.3.5), as in: 1641/// @code ::delete ptr; @endcode 1642/// or 1643/// @code delete [] ptr; @endcode 1644ExprResult 1645Sema::ActOnCXXDelete(SourceLocation StartLoc, bool UseGlobal, 1646 bool ArrayForm, Expr *ExE) { 1647 // C++ [expr.delete]p1: 1648 // The operand shall have a pointer type, or a class type having a single 1649 // conversion function to a pointer type. The result has type void. 1650 // 1651 // DR599 amends "pointer type" to "pointer to object type" in both cases. 1652 1653 ExprResult Ex = Owned(ExE); 1654 FunctionDecl *OperatorDelete = 0; 1655 bool ArrayFormAsWritten = ArrayForm; 1656 bool UsualArrayDeleteWantsSize = false; 1657 1658 if (!Ex.get()->isTypeDependent()) { 1659 QualType Type = Ex.get()->getType(); 1660 1661 if (const RecordType *Record = Type->getAs<RecordType>()) { 1662 if (RequireCompleteType(StartLoc, Type, 1663 PDiag(diag::err_delete_incomplete_class_type))) 1664 return ExprError(); 1665 1666 llvm::SmallVector<CXXConversionDecl*, 4> ObjectPtrConversions; 1667 1668 CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl()); 1669 const UnresolvedSetImpl *Conversions = RD->getVisibleConversionFunctions(); 1670 for (UnresolvedSetImpl::iterator I = Conversions->begin(), 1671 E = Conversions->end(); I != E; ++I) { 1672 NamedDecl *D = I.getDecl(); 1673 if (isa<UsingShadowDecl>(D)) 1674 D = cast<UsingShadowDecl>(D)->getTargetDecl(); 1675 1676 // Skip over templated conversion functions; they aren't considered. 1677 if (isa<FunctionTemplateDecl>(D)) 1678 continue; 1679 1680 CXXConversionDecl *Conv = cast<CXXConversionDecl>(D); 1681 1682 QualType ConvType = Conv->getConversionType().getNonReferenceType(); 1683 if (const PointerType *ConvPtrType = ConvType->getAs<PointerType>()) 1684 if (ConvPtrType->getPointeeType()->isIncompleteOrObjectType()) 1685 ObjectPtrConversions.push_back(Conv); 1686 } 1687 if (ObjectPtrConversions.size() == 1) { 1688 // We have a single conversion to a pointer-to-object type. Perform 1689 // that conversion. 1690 // TODO: don't redo the conversion calculation. 1691 ExprResult Res = 1692 PerformImplicitConversion(Ex.get(), 1693 ObjectPtrConversions.front()->getConversionType(), 1694 AA_Converting); 1695 if (Res.isUsable()) { 1696 Ex = move(Res); 1697 Type = Ex.get()->getType(); 1698 } 1699 } 1700 else if (ObjectPtrConversions.size() > 1) { 1701 Diag(StartLoc, diag::err_ambiguous_delete_operand) 1702 << Type << Ex.get()->getSourceRange(); 1703 for (unsigned i= 0; i < ObjectPtrConversions.size(); i++) 1704 NoteOverloadCandidate(ObjectPtrConversions[i]); 1705 return ExprError(); 1706 } 1707 } 1708 1709 if (!Type->isPointerType()) 1710 return ExprError(Diag(StartLoc, diag::err_delete_operand) 1711 << Type << Ex.get()->getSourceRange()); 1712 1713 QualType Pointee = Type->getAs<PointerType>()->getPointeeType(); 1714 if (Pointee->isVoidType() && !isSFINAEContext()) { 1715 // The C++ standard bans deleting a pointer to a non-object type, which 1716 // effectively bans deletion of "void*". However, most compilers support 1717 // this, so we treat it as a warning unless we're in a SFINAE context. 1718 Diag(StartLoc, diag::ext_delete_void_ptr_operand) 1719 << Type << Ex.get()->getSourceRange(); 1720 } else if (Pointee->isFunctionType() || Pointee->isVoidType()) 1721 return ExprError(Diag(StartLoc, diag::err_delete_operand) 1722 << Type << Ex.get()->getSourceRange()); 1723 else if (!Pointee->isDependentType() && 1724 RequireCompleteType(StartLoc, Pointee, 1725 PDiag(diag::warn_delete_incomplete) 1726 << Ex.get()->getSourceRange())) 1727 return ExprError(); 1728 1729 // C++ [expr.delete]p2: 1730 // [Note: a pointer to a const type can be the operand of a 1731 // delete-expression; it is not necessary to cast away the constness 1732 // (5.2.11) of the pointer expression before it is used as the operand 1733 // of the delete-expression. ] 1734 Ex = ImpCastExprToType(Ex.take(), Context.getPointerType(Context.VoidTy), 1735 CK_NoOp); 1736 1737 if (Pointee->isArrayType() && !ArrayForm) { 1738 Diag(StartLoc, diag::warn_delete_array_type) 1739 << Type << Ex.get()->getSourceRange() 1740 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(StartLoc), "[]"); 1741 ArrayForm = true; 1742 } 1743 1744 DeclarationName DeleteName = Context.DeclarationNames.getCXXOperatorName( 1745 ArrayForm ? OO_Array_Delete : OO_Delete); 1746 1747 QualType PointeeElem = Context.getBaseElementType(Pointee); 1748 if (const RecordType *RT = PointeeElem->getAs<RecordType>()) { 1749 CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 1750 1751 if (!UseGlobal && 1752 FindDeallocationFunction(StartLoc, RD, DeleteName, OperatorDelete)) 1753 return ExprError(); 1754 1755 // If we're allocating an array of records, check whether the 1756 // usual operator delete[] has a size_t parameter. 1757 if (ArrayForm) { 1758 // If the user specifically asked to use the global allocator, 1759 // we'll need to do the lookup into the class. 1760 if (UseGlobal) 1761 UsualArrayDeleteWantsSize = 1762 doesUsualArrayDeleteWantSize(*this, StartLoc, PointeeElem); 1763 1764 // Otherwise, the usual operator delete[] should be the 1765 // function we just found. 1766 else if (isa<CXXMethodDecl>(OperatorDelete)) 1767 UsualArrayDeleteWantsSize = (OperatorDelete->getNumParams() == 2); 1768 } 1769 1770 if (!RD->hasTrivialDestructor()) 1771 if (CXXDestructorDecl *Dtor = LookupDestructor(RD)) { 1772 MarkDeclarationReferenced(StartLoc, 1773 const_cast<CXXDestructorDecl*>(Dtor)); 1774 DiagnoseUseOfDecl(Dtor, StartLoc); 1775 } 1776 } 1777 1778 if (!OperatorDelete) { 1779 // Look for a global declaration. 1780 DeclareGlobalNewDelete(); 1781 DeclContext *TUDecl = Context.getTranslationUnitDecl(); 1782 Expr *Arg = Ex.get(); 1783 if (FindAllocationOverload(StartLoc, SourceRange(), DeleteName, 1784 &Arg, 1, TUDecl, /*AllowMissing=*/false, 1785 OperatorDelete)) 1786 return ExprError(); 1787 } 1788 1789 MarkDeclarationReferenced(StartLoc, OperatorDelete); 1790 1791 // Check access and ambiguity of operator delete and destructor. 1792 if (const RecordType *RT = PointeeElem->getAs<RecordType>()) { 1793 CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 1794 if (CXXDestructorDecl *Dtor = LookupDestructor(RD)) { 1795 CheckDestructorAccess(Ex.get()->getExprLoc(), Dtor, 1796 PDiag(diag::err_access_dtor) << PointeeElem); 1797 } 1798 } 1799 1800 } 1801 1802 return Owned(new (Context) CXXDeleteExpr(Context.VoidTy, UseGlobal, ArrayForm, 1803 ArrayFormAsWritten, 1804 UsualArrayDeleteWantsSize, 1805 OperatorDelete, Ex.take(), StartLoc)); 1806} 1807 1808/// \brief Check the use of the given variable as a C++ condition in an if, 1809/// while, do-while, or switch statement. 1810ExprResult Sema::CheckConditionVariable(VarDecl *ConditionVar, 1811 SourceLocation StmtLoc, 1812 bool ConvertToBoolean) { 1813 QualType T = ConditionVar->getType(); 1814 1815 // C++ [stmt.select]p2: 1816 // The declarator shall not specify a function or an array. 1817 if (T->isFunctionType()) 1818 return ExprError(Diag(ConditionVar->getLocation(), 1819 diag::err_invalid_use_of_function_type) 1820 << ConditionVar->getSourceRange()); 1821 else if (T->isArrayType()) 1822 return ExprError(Diag(ConditionVar->getLocation(), 1823 diag::err_invalid_use_of_array_type) 1824 << ConditionVar->getSourceRange()); 1825 1826 ExprResult Condition = 1827 Owned(DeclRefExpr::Create(Context, NestedNameSpecifierLoc(), 1828 ConditionVar, 1829 ConditionVar->getLocation(), 1830 ConditionVar->getType().getNonReferenceType(), 1831 VK_LValue)); 1832 if (ConvertToBoolean) { 1833 Condition = CheckBooleanCondition(Condition.take(), StmtLoc); 1834 if (Condition.isInvalid()) 1835 return ExprError(); 1836 } 1837 1838 return move(Condition); 1839} 1840 1841/// CheckCXXBooleanCondition - Returns true if a conversion to bool is invalid. 1842ExprResult Sema::CheckCXXBooleanCondition(Expr *CondExpr) { 1843 // C++ 6.4p4: 1844 // The value of a condition that is an initialized declaration in a statement 1845 // other than a switch statement is the value of the declared variable 1846 // implicitly converted to type bool. If that conversion is ill-formed, the 1847 // program is ill-formed. 1848 // The value of a condition that is an expression is the value of the 1849 // expression, implicitly converted to bool. 1850 // 1851 return PerformContextuallyConvertToBool(CondExpr); 1852} 1853 1854/// Helper function to determine whether this is the (deprecated) C++ 1855/// conversion from a string literal to a pointer to non-const char or 1856/// non-const wchar_t (for narrow and wide string literals, 1857/// respectively). 1858bool 1859Sema::IsStringLiteralToNonConstPointerConversion(Expr *From, QualType ToType) { 1860 // Look inside the implicit cast, if it exists. 1861 if (ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(From)) 1862 From = Cast->getSubExpr(); 1863 1864 // A string literal (2.13.4) that is not a wide string literal can 1865 // be converted to an rvalue of type "pointer to char"; a wide 1866 // string literal can be converted to an rvalue of type "pointer 1867 // to wchar_t" (C++ 4.2p2). 1868 if (StringLiteral *StrLit = dyn_cast<StringLiteral>(From->IgnoreParens())) 1869 if (const PointerType *ToPtrType = ToType->getAs<PointerType>()) 1870 if (const BuiltinType *ToPointeeType 1871 = ToPtrType->getPointeeType()->getAs<BuiltinType>()) { 1872 // This conversion is considered only when there is an 1873 // explicit appropriate pointer target type (C++ 4.2p2). 1874 if (!ToPtrType->getPointeeType().hasQualifiers() && 1875 ((StrLit->isWide() && ToPointeeType->isWideCharType()) || 1876 (!StrLit->isWide() && 1877 (ToPointeeType->getKind() == BuiltinType::Char_U || 1878 ToPointeeType->getKind() == BuiltinType::Char_S)))) 1879 return true; 1880 } 1881 1882 return false; 1883} 1884 1885static ExprResult BuildCXXCastArgument(Sema &S, 1886 SourceLocation CastLoc, 1887 QualType Ty, 1888 CastKind Kind, 1889 CXXMethodDecl *Method, 1890 NamedDecl *FoundDecl, 1891 Expr *From) { 1892 switch (Kind) { 1893 default: assert(0 && "Unhandled cast kind!"); 1894 case CK_ConstructorConversion: { 1895 ASTOwningVector<Expr*> ConstructorArgs(S); 1896 1897 if (S.CompleteConstructorCall(cast<CXXConstructorDecl>(Method), 1898 MultiExprArg(&From, 1), 1899 CastLoc, ConstructorArgs)) 1900 return ExprError(); 1901 1902 ExprResult Result = 1903 S.BuildCXXConstructExpr(CastLoc, Ty, cast<CXXConstructorDecl>(Method), 1904 move_arg(ConstructorArgs), 1905 /*ZeroInit*/ false, CXXConstructExpr::CK_Complete, 1906 SourceRange()); 1907 if (Result.isInvalid()) 1908 return ExprError(); 1909 1910 return S.MaybeBindToTemporary(Result.takeAs<Expr>()); 1911 } 1912 1913 case CK_UserDefinedConversion: { 1914 assert(!From->getType()->isPointerType() && "Arg can't have pointer type!"); 1915 1916 // Create an implicit call expr that calls it. 1917 ExprResult Result = S.BuildCXXMemberCallExpr(From, FoundDecl, Method); 1918 if (Result.isInvalid()) 1919 return ExprError(); 1920 1921 return S.MaybeBindToTemporary(Result.get()); 1922 } 1923 } 1924} 1925 1926/// PerformImplicitConversion - Perform an implicit conversion of the 1927/// expression From to the type ToType using the pre-computed implicit 1928/// conversion sequence ICS. Returns the converted 1929/// expression. Action is the kind of conversion we're performing, 1930/// used in the error message. 1931ExprResult 1932Sema::PerformImplicitConversion(Expr *From, QualType ToType, 1933 const ImplicitConversionSequence &ICS, 1934 AssignmentAction Action, bool CStyle) { 1935 switch (ICS.getKind()) { 1936 case ImplicitConversionSequence::StandardConversion: { 1937 ExprResult Res = PerformImplicitConversion(From, ToType, ICS.Standard, 1938 Action, CStyle); 1939 if (Res.isInvalid()) 1940 return ExprError(); 1941 From = Res.take(); 1942 break; 1943 } 1944 1945 case ImplicitConversionSequence::UserDefinedConversion: { 1946 1947 FunctionDecl *FD = ICS.UserDefined.ConversionFunction; 1948 CastKind CastKind; 1949 QualType BeforeToType; 1950 if (const CXXConversionDecl *Conv = dyn_cast<CXXConversionDecl>(FD)) { 1951 CastKind = CK_UserDefinedConversion; 1952 1953 // If the user-defined conversion is specified by a conversion function, 1954 // the initial standard conversion sequence converts the source type to 1955 // the implicit object parameter of the conversion function. 1956 BeforeToType = Context.getTagDeclType(Conv->getParent()); 1957 } else { 1958 const CXXConstructorDecl *Ctor = cast<CXXConstructorDecl>(FD); 1959 CastKind = CK_ConstructorConversion; 1960 // Do no conversion if dealing with ... for the first conversion. 1961 if (!ICS.UserDefined.EllipsisConversion) { 1962 // If the user-defined conversion is specified by a constructor, the 1963 // initial standard conversion sequence converts the source type to the 1964 // type required by the argument of the constructor 1965 BeforeToType = Ctor->getParamDecl(0)->getType().getNonReferenceType(); 1966 } 1967 } 1968 // Watch out for elipsis conversion. 1969 if (!ICS.UserDefined.EllipsisConversion) { 1970 ExprResult Res = 1971 PerformImplicitConversion(From, BeforeToType, 1972 ICS.UserDefined.Before, AA_Converting, 1973 CStyle); 1974 if (Res.isInvalid()) 1975 return ExprError(); 1976 From = Res.take(); 1977 } 1978 1979 ExprResult CastArg 1980 = BuildCXXCastArgument(*this, 1981 From->getLocStart(), 1982 ToType.getNonReferenceType(), 1983 CastKind, cast<CXXMethodDecl>(FD), 1984 ICS.UserDefined.FoundConversionFunction, 1985 From); 1986 1987 if (CastArg.isInvalid()) 1988 return ExprError(); 1989 1990 From = CastArg.take(); 1991 1992 return PerformImplicitConversion(From, ToType, ICS.UserDefined.After, 1993 AA_Converting, CStyle); 1994 } 1995 1996 case ImplicitConversionSequence::AmbiguousConversion: 1997 ICS.DiagnoseAmbiguousConversion(*this, From->getExprLoc(), 1998 PDiag(diag::err_typecheck_ambiguous_condition) 1999 << From->getSourceRange()); 2000 return ExprError(); 2001 2002 case ImplicitConversionSequence::EllipsisConversion: 2003 assert(false && "Cannot perform an ellipsis conversion"); 2004 return Owned(From); 2005 2006 case ImplicitConversionSequence::BadConversion: 2007 return ExprError(); 2008 } 2009 2010 // Everything went well. 2011 return Owned(From); 2012} 2013 2014/// PerformImplicitConversion - Perform an implicit conversion of the 2015/// expression From to the type ToType by following the standard 2016/// conversion sequence SCS. Returns the converted 2017/// expression. Flavor is the context in which we're performing this 2018/// conversion, for use in error messages. 2019ExprResult 2020Sema::PerformImplicitConversion(Expr *From, QualType ToType, 2021 const StandardConversionSequence& SCS, 2022 AssignmentAction Action, bool CStyle) { 2023 // Overall FIXME: we are recomputing too many types here and doing far too 2024 // much extra work. What this means is that we need to keep track of more 2025 // information that is computed when we try the implicit conversion initially, 2026 // so that we don't need to recompute anything here. 2027 QualType FromType = From->getType(); 2028 2029 if (SCS.CopyConstructor) { 2030 // FIXME: When can ToType be a reference type? 2031 assert(!ToType->isReferenceType()); 2032 if (SCS.Second == ICK_Derived_To_Base) { 2033 ASTOwningVector<Expr*> ConstructorArgs(*this); 2034 if (CompleteConstructorCall(cast<CXXConstructorDecl>(SCS.CopyConstructor), 2035 MultiExprArg(*this, &From, 1), 2036 /*FIXME:ConstructLoc*/SourceLocation(), 2037 ConstructorArgs)) 2038 return ExprError(); 2039 return BuildCXXConstructExpr(/*FIXME:ConstructLoc*/SourceLocation(), 2040 ToType, SCS.CopyConstructor, 2041 move_arg(ConstructorArgs), 2042 /*ZeroInit*/ false, 2043 CXXConstructExpr::CK_Complete, 2044 SourceRange()); 2045 } 2046 return BuildCXXConstructExpr(/*FIXME:ConstructLoc*/SourceLocation(), 2047 ToType, SCS.CopyConstructor, 2048 MultiExprArg(*this, &From, 1), 2049 /*ZeroInit*/ false, 2050 CXXConstructExpr::CK_Complete, 2051 SourceRange()); 2052 } 2053 2054 // Resolve overloaded function references. 2055 if (Context.hasSameType(FromType, Context.OverloadTy)) { 2056 DeclAccessPair Found; 2057 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(From, ToType, 2058 true, Found); 2059 if (!Fn) 2060 return ExprError(); 2061 2062 if (DiagnoseUseOfDecl(Fn, From->getSourceRange().getBegin())) 2063 return ExprError(); 2064 2065 From = FixOverloadedFunctionReference(From, Found, Fn); 2066 FromType = From->getType(); 2067 } 2068 2069 // Perform the first implicit conversion. 2070 switch (SCS.First) { 2071 case ICK_Identity: 2072 // Nothing to do. 2073 break; 2074 2075 case ICK_Lvalue_To_Rvalue: 2076 // Should this get its own ICK? 2077 if (From->getObjectKind() == OK_ObjCProperty) { 2078 ExprResult FromRes = ConvertPropertyForRValue(From); 2079 if (FromRes.isInvalid()) 2080 return ExprError(); 2081 From = FromRes.take(); 2082 if (!From->isGLValue()) break; 2083 } 2084 2085 // Check for trivial buffer overflows. 2086 CheckArrayAccess(From); 2087 2088 FromType = FromType.getUnqualifiedType(); 2089 From = ImplicitCastExpr::Create(Context, FromType, CK_LValueToRValue, 2090 From, 0, VK_RValue); 2091 break; 2092 2093 case ICK_Array_To_Pointer: 2094 FromType = Context.getArrayDecayedType(FromType); 2095 From = ImpCastExprToType(From, FromType, CK_ArrayToPointerDecay).take(); 2096 break; 2097 2098 case ICK_Function_To_Pointer: 2099 FromType = Context.getPointerType(FromType); 2100 From = ImpCastExprToType(From, FromType, CK_FunctionToPointerDecay).take(); 2101 break; 2102 2103 default: 2104 assert(false && "Improper first standard conversion"); 2105 break; 2106 } 2107 2108 // Perform the second implicit conversion 2109 switch (SCS.Second) { 2110 case ICK_Identity: 2111 // If both sides are functions (or pointers/references to them), there could 2112 // be incompatible exception declarations. 2113 if (CheckExceptionSpecCompatibility(From, ToType)) 2114 return ExprError(); 2115 // Nothing else to do. 2116 break; 2117 2118 case ICK_NoReturn_Adjustment: 2119 // If both sides are functions (or pointers/references to them), there could 2120 // be incompatible exception declarations. 2121 if (CheckExceptionSpecCompatibility(From, ToType)) 2122 return ExprError(); 2123 2124 From = ImpCastExprToType(From, ToType, CK_NoOp).take(); 2125 break; 2126 2127 case ICK_Integral_Promotion: 2128 case ICK_Integral_Conversion: 2129 From = ImpCastExprToType(From, ToType, CK_IntegralCast).take(); 2130 break; 2131 2132 case ICK_Floating_Promotion: 2133 case ICK_Floating_Conversion: 2134 From = ImpCastExprToType(From, ToType, CK_FloatingCast).take(); 2135 break; 2136 2137 case ICK_Complex_Promotion: 2138 case ICK_Complex_Conversion: { 2139 QualType FromEl = From->getType()->getAs<ComplexType>()->getElementType(); 2140 QualType ToEl = ToType->getAs<ComplexType>()->getElementType(); 2141 CastKind CK; 2142 if (FromEl->isRealFloatingType()) { 2143 if (ToEl->isRealFloatingType()) 2144 CK = CK_FloatingComplexCast; 2145 else 2146 CK = CK_FloatingComplexToIntegralComplex; 2147 } else if (ToEl->isRealFloatingType()) { 2148 CK = CK_IntegralComplexToFloatingComplex; 2149 } else { 2150 CK = CK_IntegralComplexCast; 2151 } 2152 From = ImpCastExprToType(From, ToType, CK).take(); 2153 break; 2154 } 2155 2156 case ICK_Floating_Integral: 2157 if (ToType->isRealFloatingType()) 2158 From = ImpCastExprToType(From, ToType, CK_IntegralToFloating).take(); 2159 else 2160 From = ImpCastExprToType(From, ToType, CK_FloatingToIntegral).take(); 2161 break; 2162 2163 case ICK_Compatible_Conversion: 2164 From = ImpCastExprToType(From, ToType, CK_NoOp).take(); 2165 break; 2166 2167 case ICK_Pointer_Conversion: { 2168 if (SCS.IncompatibleObjC && Action != AA_Casting) { 2169 // Diagnose incompatible Objective-C conversions 2170 if (Action == AA_Initializing) 2171 Diag(From->getSourceRange().getBegin(), 2172 diag::ext_typecheck_convert_incompatible_pointer) 2173 << ToType << From->getType() << Action 2174 << From->getSourceRange(); 2175 else 2176 Diag(From->getSourceRange().getBegin(), 2177 diag::ext_typecheck_convert_incompatible_pointer) 2178 << From->getType() << ToType << Action 2179 << From->getSourceRange(); 2180 } 2181 2182 CastKind Kind = CK_Invalid; 2183 CXXCastPath BasePath; 2184 if (CheckPointerConversion(From, ToType, Kind, BasePath, CStyle)) 2185 return ExprError(); 2186 From = ImpCastExprToType(From, ToType, Kind, VK_RValue, &BasePath).take(); 2187 break; 2188 } 2189 2190 case ICK_Pointer_Member: { 2191 CastKind Kind = CK_Invalid; 2192 CXXCastPath BasePath; 2193 if (CheckMemberPointerConversion(From, ToType, Kind, BasePath, CStyle)) 2194 return ExprError(); 2195 if (CheckExceptionSpecCompatibility(From, ToType)) 2196 return ExprError(); 2197 From = ImpCastExprToType(From, ToType, Kind, VK_RValue, &BasePath).take(); 2198 break; 2199 } 2200 2201 case ICK_Boolean_Conversion: 2202 From = ImpCastExprToType(From, Context.BoolTy, 2203 ScalarTypeToBooleanCastKind(FromType)).take(); 2204 break; 2205 2206 case ICK_Derived_To_Base: { 2207 CXXCastPath BasePath; 2208 if (CheckDerivedToBaseConversion(From->getType(), 2209 ToType.getNonReferenceType(), 2210 From->getLocStart(), 2211 From->getSourceRange(), 2212 &BasePath, 2213 CStyle)) 2214 return ExprError(); 2215 2216 From = ImpCastExprToType(From, ToType.getNonReferenceType(), 2217 CK_DerivedToBase, CastCategory(From), 2218 &BasePath).take(); 2219 break; 2220 } 2221 2222 case ICK_Vector_Conversion: 2223 From = ImpCastExprToType(From, ToType, CK_BitCast).take(); 2224 break; 2225 2226 case ICK_Vector_Splat: 2227 From = ImpCastExprToType(From, ToType, CK_VectorSplat).take(); 2228 break; 2229 2230 case ICK_Complex_Real: 2231 // Case 1. x -> _Complex y 2232 if (const ComplexType *ToComplex = ToType->getAs<ComplexType>()) { 2233 QualType ElType = ToComplex->getElementType(); 2234 bool isFloatingComplex = ElType->isRealFloatingType(); 2235 2236 // x -> y 2237 if (Context.hasSameUnqualifiedType(ElType, From->getType())) { 2238 // do nothing 2239 } else if (From->getType()->isRealFloatingType()) { 2240 From = ImpCastExprToType(From, ElType, 2241 isFloatingComplex ? CK_FloatingCast : CK_FloatingToIntegral).take(); 2242 } else { 2243 assert(From->getType()->isIntegerType()); 2244 From = ImpCastExprToType(From, ElType, 2245 isFloatingComplex ? CK_IntegralToFloating : CK_IntegralCast).take(); 2246 } 2247 // y -> _Complex y 2248 From = ImpCastExprToType(From, ToType, 2249 isFloatingComplex ? CK_FloatingRealToComplex 2250 : CK_IntegralRealToComplex).take(); 2251 2252 // Case 2. _Complex x -> y 2253 } else { 2254 const ComplexType *FromComplex = From->getType()->getAs<ComplexType>(); 2255 assert(FromComplex); 2256 2257 QualType ElType = FromComplex->getElementType(); 2258 bool isFloatingComplex = ElType->isRealFloatingType(); 2259 2260 // _Complex x -> x 2261 From = ImpCastExprToType(From, ElType, 2262 isFloatingComplex ? CK_FloatingComplexToReal 2263 : CK_IntegralComplexToReal).take(); 2264 2265 // x -> y 2266 if (Context.hasSameUnqualifiedType(ElType, ToType)) { 2267 // do nothing 2268 } else if (ToType->isRealFloatingType()) { 2269 From = ImpCastExprToType(From, ToType, 2270 isFloatingComplex ? CK_FloatingCast : CK_IntegralToFloating).take(); 2271 } else { 2272 assert(ToType->isIntegerType()); 2273 From = ImpCastExprToType(From, ToType, 2274 isFloatingComplex ? CK_FloatingToIntegral : CK_IntegralCast).take(); 2275 } 2276 } 2277 break; 2278 2279 case ICK_Block_Pointer_Conversion: { 2280 From = ImpCastExprToType(From, ToType.getUnqualifiedType(), CK_BitCast, 2281 VK_RValue).take(); 2282 break; 2283 } 2284 2285 case ICK_TransparentUnionConversion: { 2286 ExprResult FromRes = Owned(From); 2287 Sema::AssignConvertType ConvTy = 2288 CheckTransparentUnionArgumentConstraints(ToType, FromRes); 2289 if (FromRes.isInvalid()) 2290 return ExprError(); 2291 From = FromRes.take(); 2292 assert ((ConvTy == Sema::Compatible) && 2293 "Improper transparent union conversion"); 2294 (void)ConvTy; 2295 break; 2296 } 2297 2298 case ICK_Lvalue_To_Rvalue: 2299 case ICK_Array_To_Pointer: 2300 case ICK_Function_To_Pointer: 2301 case ICK_Qualification: 2302 case ICK_Num_Conversion_Kinds: 2303 assert(false && "Improper second standard conversion"); 2304 break; 2305 } 2306 2307 switch (SCS.Third) { 2308 case ICK_Identity: 2309 // Nothing to do. 2310 break; 2311 2312 case ICK_Qualification: { 2313 // The qualification keeps the category of the inner expression, unless the 2314 // target type isn't a reference. 2315 ExprValueKind VK = ToType->isReferenceType() ? 2316 CastCategory(From) : VK_RValue; 2317 From = ImpCastExprToType(From, ToType.getNonLValueExprType(Context), 2318 CK_NoOp, VK).take(); 2319 2320 if (SCS.DeprecatedStringLiteralToCharPtr && 2321 !getLangOptions().WritableStrings) 2322 Diag(From->getLocStart(), diag::warn_deprecated_string_literal_conversion) 2323 << ToType.getNonReferenceType(); 2324 2325 break; 2326 } 2327 2328 default: 2329 assert(false && "Improper third standard conversion"); 2330 break; 2331 } 2332 2333 return Owned(From); 2334} 2335 2336ExprResult Sema::ActOnUnaryTypeTrait(UnaryTypeTrait UTT, 2337 SourceLocation KWLoc, 2338 ParsedType Ty, 2339 SourceLocation RParen) { 2340 TypeSourceInfo *TSInfo; 2341 QualType T = GetTypeFromParser(Ty, &TSInfo); 2342 2343 if (!TSInfo) 2344 TSInfo = Context.getTrivialTypeSourceInfo(T); 2345 return BuildUnaryTypeTrait(UTT, KWLoc, TSInfo, RParen); 2346} 2347 2348static bool EvaluateUnaryTypeTrait(Sema &Self, UnaryTypeTrait UTT, QualType T, 2349 SourceLocation KeyLoc) { 2350 // FIXME: For many of these traits, we need a complete type before we can 2351 // check these properties. 2352 assert(!T->isDependentType() && 2353 "Cannot evaluate traits for dependent types."); 2354 ASTContext &C = Self.Context; 2355 switch(UTT) { 2356 default: assert(false && "Unknown type trait or not implemented"); 2357 case UTT_IsPOD: return T->isPODType(); 2358 case UTT_IsLiteral: return T->isLiteralType(); 2359 case UTT_IsClass: // Fallthrough 2360 case UTT_IsUnion: 2361 if (const RecordType *Record = T->getAs<RecordType>()) { 2362 bool Union = Record->getDecl()->isUnion(); 2363 return UTT == UTT_IsUnion ? Union : !Union; 2364 } 2365 return false; 2366 case UTT_IsEnum: return T->isEnumeralType(); 2367 case UTT_IsPolymorphic: 2368 if (const RecordType *Record = T->getAs<RecordType>()) { 2369 // Type traits are only parsed in C++, so we've got CXXRecords. 2370 return cast<CXXRecordDecl>(Record->getDecl())->isPolymorphic(); 2371 } 2372 return false; 2373 case UTT_IsAbstract: 2374 if (const RecordType *RT = T->getAs<RecordType>()) 2375 return cast<CXXRecordDecl>(RT->getDecl())->isAbstract(); 2376 return false; 2377 case UTT_IsEmpty: 2378 if (const RecordType *Record = T->getAs<RecordType>()) { 2379 return !Record->getDecl()->isUnion() 2380 && cast<CXXRecordDecl>(Record->getDecl())->isEmpty(); 2381 } 2382 return false; 2383 case UTT_HasTrivialConstructor: 2384 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html: 2385 // If __is_pod (type) is true then the trait is true, else if type is 2386 // a cv class or union type (or array thereof) with a trivial default 2387 // constructor ([class.ctor]) then the trait is true, else it is false. 2388 if (T->isPODType()) 2389 return true; 2390 if (const RecordType *RT = 2391 C.getBaseElementType(T)->getAs<RecordType>()) 2392 return cast<CXXRecordDecl>(RT->getDecl())->hasTrivialConstructor(); 2393 return false; 2394 case UTT_HasTrivialCopy: 2395 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html: 2396 // If __is_pod (type) is true or type is a reference type then 2397 // the trait is true, else if type is a cv class or union type 2398 // with a trivial copy constructor ([class.copy]) then the trait 2399 // is true, else it is false. 2400 if (T->isPODType() || T->isReferenceType()) 2401 return true; 2402 if (const RecordType *RT = T->getAs<RecordType>()) 2403 return cast<CXXRecordDecl>(RT->getDecl())->hasTrivialCopyConstructor(); 2404 return false; 2405 case UTT_HasTrivialAssign: 2406 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html: 2407 // If type is const qualified or is a reference type then the 2408 // trait is false. Otherwise if __is_pod (type) is true then the 2409 // trait is true, else if type is a cv class or union type with 2410 // a trivial copy assignment ([class.copy]) then the trait is 2411 // true, else it is false. 2412 // Note: the const and reference restrictions are interesting, 2413 // given that const and reference members don't prevent a class 2414 // from having a trivial copy assignment operator (but do cause 2415 // errors if the copy assignment operator is actually used, q.v. 2416 // [class.copy]p12). 2417 2418 if (C.getBaseElementType(T).isConstQualified()) 2419 return false; 2420 if (T->isPODType()) 2421 return true; 2422 if (const RecordType *RT = T->getAs<RecordType>()) 2423 return cast<CXXRecordDecl>(RT->getDecl())->hasTrivialCopyAssignment(); 2424 return false; 2425 case UTT_HasTrivialDestructor: 2426 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html: 2427 // If __is_pod (type) is true or type is a reference type 2428 // then the trait is true, else if type is a cv class or union 2429 // type (or array thereof) with a trivial destructor 2430 // ([class.dtor]) then the trait is true, else it is 2431 // false. 2432 if (T->isPODType() || T->isReferenceType()) 2433 return true; 2434 if (const RecordType *RT = 2435 C.getBaseElementType(T)->getAs<RecordType>()) 2436 return cast<CXXRecordDecl>(RT->getDecl())->hasTrivialDestructor(); 2437 return false; 2438 // TODO: Propagate nothrowness for implicitly declared special members. 2439 case UTT_HasNothrowAssign: 2440 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html: 2441 // If type is const qualified or is a reference type then the 2442 // trait is false. Otherwise if __has_trivial_assign (type) 2443 // is true then the trait is true, else if type is a cv class 2444 // or union type with copy assignment operators that are known 2445 // not to throw an exception then the trait is true, else it is 2446 // false. 2447 if (C.getBaseElementType(T).isConstQualified()) 2448 return false; 2449 if (T->isReferenceType()) 2450 return false; 2451 if (T->isPODType()) 2452 return true; 2453 if (const RecordType *RT = T->getAs<RecordType>()) { 2454 CXXRecordDecl* RD = cast<CXXRecordDecl>(RT->getDecl()); 2455 if (RD->hasTrivialCopyAssignment()) 2456 return true; 2457 2458 bool FoundAssign = false; 2459 bool AllNoThrow = true; 2460 DeclarationName Name = C.DeclarationNames.getCXXOperatorName(OO_Equal); 2461 LookupResult Res(Self, DeclarationNameInfo(Name, KeyLoc), 2462 Sema::LookupOrdinaryName); 2463 if (Self.LookupQualifiedName(Res, RD)) { 2464 for (LookupResult::iterator Op = Res.begin(), OpEnd = Res.end(); 2465 Op != OpEnd; ++Op) { 2466 CXXMethodDecl *Operator = cast<CXXMethodDecl>(*Op); 2467 if (Operator->isCopyAssignmentOperator()) { 2468 FoundAssign = true; 2469 const FunctionProtoType *CPT 2470 = Operator->getType()->getAs<FunctionProtoType>(); 2471 if (!CPT->isNothrow(Self.Context)) { 2472 AllNoThrow = false; 2473 break; 2474 } 2475 } 2476 } 2477 } 2478 2479 return FoundAssign && AllNoThrow; 2480 } 2481 return false; 2482 case UTT_HasNothrowCopy: 2483 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html: 2484 // If __has_trivial_copy (type) is true then the trait is true, else 2485 // if type is a cv class or union type with copy constructors that are 2486 // known not to throw an exception then the trait is true, else it is 2487 // false. 2488 if (T->isPODType() || T->isReferenceType()) 2489 return true; 2490 if (const RecordType *RT = T->getAs<RecordType>()) { 2491 CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2492 if (RD->hasTrivialCopyConstructor()) 2493 return true; 2494 2495 bool FoundConstructor = false; 2496 bool AllNoThrow = true; 2497 unsigned FoundTQs; 2498 DeclContext::lookup_const_iterator Con, ConEnd; 2499 for (llvm::tie(Con, ConEnd) = Self.LookupConstructors(RD); 2500 Con != ConEnd; ++Con) { 2501 // A template constructor is never a copy constructor. 2502 // FIXME: However, it may actually be selected at the actual overload 2503 // resolution point. 2504 if (isa<FunctionTemplateDecl>(*Con)) 2505 continue; 2506 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 2507 if (Constructor->isCopyConstructor(FoundTQs)) { 2508 FoundConstructor = true; 2509 const FunctionProtoType *CPT 2510 = Constructor->getType()->getAs<FunctionProtoType>(); 2511 // FIXME: check whether evaluating default arguments can throw. 2512 // For now, we'll be conservative and assume that they can throw. 2513 if (!CPT->isNothrow(Self.Context) || CPT->getNumArgs() > 1) { 2514 AllNoThrow = false; 2515 break; 2516 } 2517 } 2518 } 2519 2520 return FoundConstructor && AllNoThrow; 2521 } 2522 return false; 2523 case UTT_HasNothrowConstructor: 2524 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html: 2525 // If __has_trivial_constructor (type) is true then the trait is 2526 // true, else if type is a cv class or union type (or array 2527 // thereof) with a default constructor that is known not to 2528 // throw an exception then the trait is true, else it is false. 2529 if (T->isPODType()) 2530 return true; 2531 if (const RecordType *RT = C.getBaseElementType(T)->getAs<RecordType>()) { 2532 CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2533 if (RD->hasTrivialConstructor()) 2534 return true; 2535 2536 DeclContext::lookup_const_iterator Con, ConEnd; 2537 for (llvm::tie(Con, ConEnd) = Self.LookupConstructors(RD); 2538 Con != ConEnd; ++Con) { 2539 // FIXME: In C++0x, a constructor template can be a default constructor. 2540 if (isa<FunctionTemplateDecl>(*Con)) 2541 continue; 2542 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 2543 if (Constructor->isDefaultConstructor()) { 2544 const FunctionProtoType *CPT 2545 = Constructor->getType()->getAs<FunctionProtoType>(); 2546 // TODO: check whether evaluating default arguments can throw. 2547 // For now, we'll be conservative and assume that they can throw. 2548 return CPT->isNothrow(Self.Context) && CPT->getNumArgs() == 0; 2549 } 2550 } 2551 } 2552 return false; 2553 case UTT_HasVirtualDestructor: 2554 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html: 2555 // If type is a class type with a virtual destructor ([class.dtor]) 2556 // then the trait is true, else it is false. 2557 if (const RecordType *Record = T->getAs<RecordType>()) { 2558 CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl()); 2559 if (CXXDestructorDecl *Destructor = Self.LookupDestructor(RD)) 2560 return Destructor->isVirtual(); 2561 } 2562 return false; 2563 } 2564} 2565 2566ExprResult Sema::BuildUnaryTypeTrait(UnaryTypeTrait UTT, 2567 SourceLocation KWLoc, 2568 TypeSourceInfo *TSInfo, 2569 SourceLocation RParen) { 2570 QualType T = TSInfo->getType(); 2571 2572 // According to http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html 2573 // all traits except __is_class, __is_enum and __is_union require a the type 2574 // to be complete, an array of unknown bound, or void. 2575 if (UTT != UTT_IsClass && UTT != UTT_IsEnum && UTT != UTT_IsUnion) { 2576 QualType E = T; 2577 if (T->isIncompleteArrayType()) 2578 E = Context.getAsArrayType(T)->getElementType(); 2579 if (!T->isVoidType() && 2580 RequireCompleteType(KWLoc, E, 2581 diag::err_incomplete_type_used_in_type_trait_expr)) 2582 return ExprError(); 2583 } 2584 2585 bool Value = false; 2586 if (!T->isDependentType()) 2587 Value = EvaluateUnaryTypeTrait(*this, UTT, T, KWLoc); 2588 2589 return Owned(new (Context) UnaryTypeTraitExpr(KWLoc, UTT, TSInfo, Value, 2590 RParen, Context.BoolTy)); 2591} 2592 2593ExprResult Sema::ActOnBinaryTypeTrait(BinaryTypeTrait BTT, 2594 SourceLocation KWLoc, 2595 ParsedType LhsTy, 2596 ParsedType RhsTy, 2597 SourceLocation RParen) { 2598 TypeSourceInfo *LhsTSInfo; 2599 QualType LhsT = GetTypeFromParser(LhsTy, &LhsTSInfo); 2600 if (!LhsTSInfo) 2601 LhsTSInfo = Context.getTrivialTypeSourceInfo(LhsT); 2602 2603 TypeSourceInfo *RhsTSInfo; 2604 QualType RhsT = GetTypeFromParser(RhsTy, &RhsTSInfo); 2605 if (!RhsTSInfo) 2606 RhsTSInfo = Context.getTrivialTypeSourceInfo(RhsT); 2607 2608 return BuildBinaryTypeTrait(BTT, KWLoc, LhsTSInfo, RhsTSInfo, RParen); 2609} 2610 2611static bool EvaluateBinaryTypeTrait(Sema &Self, BinaryTypeTrait BTT, 2612 QualType LhsT, QualType RhsT, 2613 SourceLocation KeyLoc) { 2614 assert((!LhsT->isDependentType() || RhsT->isDependentType()) && 2615 "Cannot evaluate traits for dependent types."); 2616 2617 switch(BTT) { 2618 case BTT_IsBaseOf: { 2619 // C++0x [meta.rel]p2 2620 // Base is a base class of Derived without regard to cv-qualifiers or 2621 // Base and Derived are not unions and name the same class type without 2622 // regard to cv-qualifiers. 2623 2624 const RecordType *lhsRecord = LhsT->getAs<RecordType>(); 2625 if (!lhsRecord) return false; 2626 2627 const RecordType *rhsRecord = RhsT->getAs<RecordType>(); 2628 if (!rhsRecord) return false; 2629 2630 assert(Self.Context.hasSameUnqualifiedType(LhsT, RhsT) 2631 == (lhsRecord == rhsRecord)); 2632 2633 if (lhsRecord == rhsRecord) 2634 return !lhsRecord->getDecl()->isUnion(); 2635 2636 // C++0x [meta.rel]p2: 2637 // If Base and Derived are class types and are different types 2638 // (ignoring possible cv-qualifiers) then Derived shall be a 2639 // complete type. 2640 if (Self.RequireCompleteType(KeyLoc, RhsT, 2641 diag::err_incomplete_type_used_in_type_trait_expr)) 2642 return false; 2643 2644 return cast<CXXRecordDecl>(rhsRecord->getDecl()) 2645 ->isDerivedFrom(cast<CXXRecordDecl>(lhsRecord->getDecl())); 2646 } 2647 2648 case BTT_TypeCompatible: 2649 return Self.Context.typesAreCompatible(LhsT.getUnqualifiedType(), 2650 RhsT.getUnqualifiedType()); 2651 2652 case BTT_IsConvertibleTo: { 2653 // C++0x [meta.rel]p4: 2654 // Given the following function prototype: 2655 // 2656 // template <class T> 2657 // typename add_rvalue_reference<T>::type create(); 2658 // 2659 // the predicate condition for a template specialization 2660 // is_convertible<From, To> shall be satisfied if and only if 2661 // the return expression in the following code would be 2662 // well-formed, including any implicit conversions to the return 2663 // type of the function: 2664 // 2665 // To test() { 2666 // return create<From>(); 2667 // } 2668 // 2669 // Access checking is performed as if in a context unrelated to To and 2670 // From. Only the validity of the immediate context of the expression 2671 // of the return-statement (including conversions to the return type) 2672 // is considered. 2673 // 2674 // We model the initialization as a copy-initialization of a temporary 2675 // of the appropriate type, which for this expression is identical to the 2676 // return statement (since NRVO doesn't apply). 2677 if (LhsT->isObjectType() || LhsT->isFunctionType()) 2678 LhsT = Self.Context.getRValueReferenceType(LhsT); 2679 2680 InitializedEntity To(InitializedEntity::InitializeTemporary(RhsT)); 2681 OpaqueValueExpr From(KeyLoc, LhsT.getNonLValueExprType(Self.Context), 2682 Expr::getValueKindForType(LhsT)); 2683 Expr *FromPtr = &From; 2684 InitializationKind Kind(InitializationKind::CreateCopy(KeyLoc, 2685 SourceLocation())); 2686 2687 // Perform the initialization within a SFINAE trap at translation unit 2688 // scope. 2689 Sema::SFINAETrap SFINAE(Self, /*AccessCheckingSFINAE=*/true); 2690 Sema::ContextRAII TUContext(Self, Self.Context.getTranslationUnitDecl()); 2691 InitializationSequence Init(Self, To, Kind, &FromPtr, 1); 2692 if (Init.getKind() == InitializationSequence::FailedSequence) 2693 return false; 2694 2695 ExprResult Result = Init.Perform(Self, To, Kind, MultiExprArg(&FromPtr, 1)); 2696 return !Result.isInvalid() && !SFINAE.hasErrorOccurred(); 2697 } 2698 } 2699 llvm_unreachable("Unknown type trait or not implemented"); 2700} 2701 2702ExprResult Sema::BuildBinaryTypeTrait(BinaryTypeTrait BTT, 2703 SourceLocation KWLoc, 2704 TypeSourceInfo *LhsTSInfo, 2705 TypeSourceInfo *RhsTSInfo, 2706 SourceLocation RParen) { 2707 QualType LhsT = LhsTSInfo->getType(); 2708 QualType RhsT = RhsTSInfo->getType(); 2709 2710 if (BTT == BTT_TypeCompatible) { 2711 if (getLangOptions().CPlusPlus) { 2712 Diag(KWLoc, diag::err_types_compatible_p_in_cplusplus) 2713 << SourceRange(KWLoc, RParen); 2714 return ExprError(); 2715 } 2716 } 2717 2718 bool Value = false; 2719 if (!LhsT->isDependentType() && !RhsT->isDependentType()) 2720 Value = EvaluateBinaryTypeTrait(*this, BTT, LhsT, RhsT, KWLoc); 2721 2722 // Select trait result type. 2723 QualType ResultType; 2724 switch (BTT) { 2725 case BTT_IsBaseOf: ResultType = Context.BoolTy; break; 2726 case BTT_TypeCompatible: ResultType = Context.IntTy; break; 2727 case BTT_IsConvertibleTo: ResultType = Context.BoolTy; break; 2728 } 2729 2730 return Owned(new (Context) BinaryTypeTraitExpr(KWLoc, BTT, LhsTSInfo, 2731 RhsTSInfo, Value, RParen, 2732 ResultType)); 2733} 2734 2735QualType Sema::CheckPointerToMemberOperands(ExprResult &lex, ExprResult &rex, 2736 ExprValueKind &VK, 2737 SourceLocation Loc, 2738 bool isIndirect) { 2739 const char *OpSpelling = isIndirect ? "->*" : ".*"; 2740 // C++ 5.5p2 2741 // The binary operator .* [p3: ->*] binds its second operand, which shall 2742 // be of type "pointer to member of T" (where T is a completely-defined 2743 // class type) [...] 2744 QualType RType = rex.get()->getType(); 2745 const MemberPointerType *MemPtr = RType->getAs<MemberPointerType>(); 2746 if (!MemPtr) { 2747 Diag(Loc, diag::err_bad_memptr_rhs) 2748 << OpSpelling << RType << rex.get()->getSourceRange(); 2749 return QualType(); 2750 } 2751 2752 QualType Class(MemPtr->getClass(), 0); 2753 2754 // Note: C++ [expr.mptr.oper]p2-3 says that the class type into which the 2755 // member pointer points must be completely-defined. However, there is no 2756 // reason for this semantic distinction, and the rule is not enforced by 2757 // other compilers. Therefore, we do not check this property, as it is 2758 // likely to be considered a defect. 2759 2760 // C++ 5.5p2 2761 // [...] to its first operand, which shall be of class T or of a class of 2762 // which T is an unambiguous and accessible base class. [p3: a pointer to 2763 // such a class] 2764 QualType LType = lex.get()->getType(); 2765 if (isIndirect) { 2766 if (const PointerType *Ptr = LType->getAs<PointerType>()) 2767 LType = Ptr->getPointeeType(); 2768 else { 2769 Diag(Loc, diag::err_bad_memptr_lhs) 2770 << OpSpelling << 1 << LType 2771 << FixItHint::CreateReplacement(SourceRange(Loc), ".*"); 2772 return QualType(); 2773 } 2774 } 2775 2776 if (!Context.hasSameUnqualifiedType(Class, LType)) { 2777 // If we want to check the hierarchy, we need a complete type. 2778 if (RequireCompleteType(Loc, LType, PDiag(diag::err_bad_memptr_lhs) 2779 << OpSpelling << (int)isIndirect)) { 2780 return QualType(); 2781 } 2782 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 2783 /*DetectVirtual=*/false); 2784 // FIXME: Would it be useful to print full ambiguity paths, or is that 2785 // overkill? 2786 if (!IsDerivedFrom(LType, Class, Paths) || 2787 Paths.isAmbiguous(Context.getCanonicalType(Class))) { 2788 Diag(Loc, diag::err_bad_memptr_lhs) << OpSpelling 2789 << (int)isIndirect << lex.get()->getType(); 2790 return QualType(); 2791 } 2792 // Cast LHS to type of use. 2793 QualType UseType = isIndirect ? Context.getPointerType(Class) : Class; 2794 ExprValueKind VK = 2795 isIndirect ? VK_RValue : CastCategory(lex.get()); 2796 2797 CXXCastPath BasePath; 2798 BuildBasePathArray(Paths, BasePath); 2799 lex = ImpCastExprToType(lex.take(), UseType, CK_DerivedToBase, VK, &BasePath); 2800 } 2801 2802 if (isa<CXXScalarValueInitExpr>(rex.get()->IgnoreParens())) { 2803 // Diagnose use of pointer-to-member type which when used as 2804 // the functional cast in a pointer-to-member expression. 2805 Diag(Loc, diag::err_pointer_to_member_type) << isIndirect; 2806 return QualType(); 2807 } 2808 2809 // C++ 5.5p2 2810 // The result is an object or a function of the type specified by the 2811 // second operand. 2812 // The cv qualifiers are the union of those in the pointer and the left side, 2813 // in accordance with 5.5p5 and 5.2.5. 2814 // FIXME: This returns a dereferenced member function pointer as a normal 2815 // function type. However, the only operation valid on such functions is 2816 // calling them. There's also a GCC extension to get a function pointer to the 2817 // thing, which is another complication, because this type - unlike the type 2818 // that is the result of this expression - takes the class as the first 2819 // argument. 2820 // We probably need a "MemberFunctionClosureType" or something like that. 2821 QualType Result = MemPtr->getPointeeType(); 2822 Result = Context.getCVRQualifiedType(Result, LType.getCVRQualifiers()); 2823 2824 // C++0x [expr.mptr.oper]p6: 2825 // In a .* expression whose object expression is an rvalue, the program is 2826 // ill-formed if the second operand is a pointer to member function with 2827 // ref-qualifier &. In a ->* expression or in a .* expression whose object 2828 // expression is an lvalue, the program is ill-formed if the second operand 2829 // is a pointer to member function with ref-qualifier &&. 2830 if (const FunctionProtoType *Proto = Result->getAs<FunctionProtoType>()) { 2831 switch (Proto->getRefQualifier()) { 2832 case RQ_None: 2833 // Do nothing 2834 break; 2835 2836 case RQ_LValue: 2837 if (!isIndirect && !lex.get()->Classify(Context).isLValue()) 2838 Diag(Loc, diag::err_pointer_to_member_oper_value_classify) 2839 << RType << 1 << lex.get()->getSourceRange(); 2840 break; 2841 2842 case RQ_RValue: 2843 if (isIndirect || !lex.get()->Classify(Context).isRValue()) 2844 Diag(Loc, diag::err_pointer_to_member_oper_value_classify) 2845 << RType << 0 << lex.get()->getSourceRange(); 2846 break; 2847 } 2848 } 2849 2850 // C++ [expr.mptr.oper]p6: 2851 // The result of a .* expression whose second operand is a pointer 2852 // to a data member is of the same value category as its 2853 // first operand. The result of a .* expression whose second 2854 // operand is a pointer to a member function is a prvalue. The 2855 // result of an ->* expression is an lvalue if its second operand 2856 // is a pointer to data member and a prvalue otherwise. 2857 if (Result->isFunctionType()) 2858 VK = VK_RValue; 2859 else if (isIndirect) 2860 VK = VK_LValue; 2861 else 2862 VK = lex.get()->getValueKind(); 2863 2864 return Result; 2865} 2866 2867/// \brief Try to convert a type to another according to C++0x 5.16p3. 2868/// 2869/// This is part of the parameter validation for the ? operator. If either 2870/// value operand is a class type, the two operands are attempted to be 2871/// converted to each other. This function does the conversion in one direction. 2872/// It returns true if the program is ill-formed and has already been diagnosed 2873/// as such. 2874static bool TryClassUnification(Sema &Self, Expr *From, Expr *To, 2875 SourceLocation QuestionLoc, 2876 bool &HaveConversion, 2877 QualType &ToType) { 2878 HaveConversion = false; 2879 ToType = To->getType(); 2880 2881 InitializationKind Kind = InitializationKind::CreateCopy(To->getLocStart(), 2882 SourceLocation()); 2883 // C++0x 5.16p3 2884 // The process for determining whether an operand expression E1 of type T1 2885 // can be converted to match an operand expression E2 of type T2 is defined 2886 // as follows: 2887 // -- If E2 is an lvalue: 2888 bool ToIsLvalue = To->isLValue(); 2889 if (ToIsLvalue) { 2890 // E1 can be converted to match E2 if E1 can be implicitly converted to 2891 // type "lvalue reference to T2", subject to the constraint that in the 2892 // conversion the reference must bind directly to E1. 2893 QualType T = Self.Context.getLValueReferenceType(ToType); 2894 InitializedEntity Entity = InitializedEntity::InitializeTemporary(T); 2895 2896 InitializationSequence InitSeq(Self, Entity, Kind, &From, 1); 2897 if (InitSeq.isDirectReferenceBinding()) { 2898 ToType = T; 2899 HaveConversion = true; 2900 return false; 2901 } 2902 2903 if (InitSeq.isAmbiguous()) 2904 return InitSeq.Diagnose(Self, Entity, Kind, &From, 1); 2905 } 2906 2907 // -- If E2 is an rvalue, or if the conversion above cannot be done: 2908 // -- if E1 and E2 have class type, and the underlying class types are 2909 // the same or one is a base class of the other: 2910 QualType FTy = From->getType(); 2911 QualType TTy = To->getType(); 2912 const RecordType *FRec = FTy->getAs<RecordType>(); 2913 const RecordType *TRec = TTy->getAs<RecordType>(); 2914 bool FDerivedFromT = FRec && TRec && FRec != TRec && 2915 Self.IsDerivedFrom(FTy, TTy); 2916 if (FRec && TRec && 2917 (FRec == TRec || FDerivedFromT || Self.IsDerivedFrom(TTy, FTy))) { 2918 // E1 can be converted to match E2 if the class of T2 is the 2919 // same type as, or a base class of, the class of T1, and 2920 // [cv2 > cv1]. 2921 if (FRec == TRec || FDerivedFromT) { 2922 if (TTy.isAtLeastAsQualifiedAs(FTy)) { 2923 InitializedEntity Entity = InitializedEntity::InitializeTemporary(TTy); 2924 InitializationSequence InitSeq(Self, Entity, Kind, &From, 1); 2925 if (InitSeq.getKind() != InitializationSequence::FailedSequence) { 2926 HaveConversion = true; 2927 return false; 2928 } 2929 2930 if (InitSeq.isAmbiguous()) 2931 return InitSeq.Diagnose(Self, Entity, Kind, &From, 1); 2932 } 2933 } 2934 2935 return false; 2936 } 2937 2938 // -- Otherwise: E1 can be converted to match E2 if E1 can be 2939 // implicitly converted to the type that expression E2 would have 2940 // if E2 were converted to an rvalue (or the type it has, if E2 is 2941 // an rvalue). 2942 // 2943 // This actually refers very narrowly to the lvalue-to-rvalue conversion, not 2944 // to the array-to-pointer or function-to-pointer conversions. 2945 if (!TTy->getAs<TagType>()) 2946 TTy = TTy.getUnqualifiedType(); 2947 2948 InitializedEntity Entity = InitializedEntity::InitializeTemporary(TTy); 2949 InitializationSequence InitSeq(Self, Entity, Kind, &From, 1); 2950 HaveConversion = InitSeq.getKind() != InitializationSequence::FailedSequence; 2951 ToType = TTy; 2952 if (InitSeq.isAmbiguous()) 2953 return InitSeq.Diagnose(Self, Entity, Kind, &From, 1); 2954 2955 return false; 2956} 2957 2958/// \brief Try to find a common type for two according to C++0x 5.16p5. 2959/// 2960/// This is part of the parameter validation for the ? operator. If either 2961/// value operand is a class type, overload resolution is used to find a 2962/// conversion to a common type. 2963static bool FindConditionalOverload(Sema &Self, ExprResult &LHS, ExprResult &RHS, 2964 SourceLocation QuestionLoc) { 2965 Expr *Args[2] = { LHS.get(), RHS.get() }; 2966 OverloadCandidateSet CandidateSet(QuestionLoc); 2967 Self.AddBuiltinOperatorCandidates(OO_Conditional, QuestionLoc, Args, 2, 2968 CandidateSet); 2969 2970 OverloadCandidateSet::iterator Best; 2971 switch (CandidateSet.BestViableFunction(Self, QuestionLoc, Best)) { 2972 case OR_Success: { 2973 // We found a match. Perform the conversions on the arguments and move on. 2974 ExprResult LHSRes = 2975 Self.PerformImplicitConversion(LHS.get(), Best->BuiltinTypes.ParamTypes[0], 2976 Best->Conversions[0], Sema::AA_Converting); 2977 if (LHSRes.isInvalid()) 2978 break; 2979 LHS = move(LHSRes); 2980 2981 ExprResult RHSRes = 2982 Self.PerformImplicitConversion(RHS.get(), Best->BuiltinTypes.ParamTypes[1], 2983 Best->Conversions[1], Sema::AA_Converting); 2984 if (RHSRes.isInvalid()) 2985 break; 2986 RHS = move(RHSRes); 2987 if (Best->Function) 2988 Self.MarkDeclarationReferenced(QuestionLoc, Best->Function); 2989 return false; 2990 } 2991 2992 case OR_No_Viable_Function: 2993 2994 // Emit a better diagnostic if one of the expressions is a null pointer 2995 // constant and the other is a pointer type. In this case, the user most 2996 // likely forgot to take the address of the other expression. 2997 if (Self.DiagnoseConditionalForNull(LHS.get(), RHS.get(), QuestionLoc)) 2998 return true; 2999 3000 Self.Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 3001 << LHS.get()->getType() << RHS.get()->getType() 3002 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange(); 3003 return true; 3004 3005 case OR_Ambiguous: 3006 Self.Diag(QuestionLoc, diag::err_conditional_ambiguous_ovl) 3007 << LHS.get()->getType() << RHS.get()->getType() 3008 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange(); 3009 // FIXME: Print the possible common types by printing the return types of 3010 // the viable candidates. 3011 break; 3012 3013 case OR_Deleted: 3014 assert(false && "Conditional operator has only built-in overloads"); 3015 break; 3016 } 3017 return true; 3018} 3019 3020/// \brief Perform an "extended" implicit conversion as returned by 3021/// TryClassUnification. 3022static bool ConvertForConditional(Sema &Self, ExprResult &E, QualType T) { 3023 InitializedEntity Entity = InitializedEntity::InitializeTemporary(T); 3024 InitializationKind Kind = InitializationKind::CreateCopy(E.get()->getLocStart(), 3025 SourceLocation()); 3026 Expr *Arg = E.take(); 3027 InitializationSequence InitSeq(Self, Entity, Kind, &Arg, 1); 3028 ExprResult Result = InitSeq.Perform(Self, Entity, Kind, MultiExprArg(&Arg, 1)); 3029 if (Result.isInvalid()) 3030 return true; 3031 3032 E = Result; 3033 return false; 3034} 3035 3036/// \brief Check the operands of ?: under C++ semantics. 3037/// 3038/// See C++ [expr.cond]. Note that LHS is never null, even for the GNU x ?: y 3039/// extension. In this case, LHS == Cond. (But they're not aliases.) 3040QualType Sema::CXXCheckConditionalOperands(ExprResult &Cond, ExprResult &LHS, ExprResult &RHS, 3041 ExprValueKind &VK, ExprObjectKind &OK, 3042 SourceLocation QuestionLoc) { 3043 // FIXME: Handle C99's complex types, vector types, block pointers and Obj-C++ 3044 // interface pointers. 3045 3046 // C++0x 5.16p1 3047 // The first expression is contextually converted to bool. 3048 if (!Cond.get()->isTypeDependent()) { 3049 ExprResult CondRes = CheckCXXBooleanCondition(Cond.take()); 3050 if (CondRes.isInvalid()) 3051 return QualType(); 3052 Cond = move(CondRes); 3053 } 3054 3055 // Assume r-value. 3056 VK = VK_RValue; 3057 OK = OK_Ordinary; 3058 3059 // Either of the arguments dependent? 3060 if (LHS.get()->isTypeDependent() || RHS.get()->isTypeDependent()) 3061 return Context.DependentTy; 3062 3063 // C++0x 5.16p2 3064 // If either the second or the third operand has type (cv) void, ... 3065 QualType LTy = LHS.get()->getType(); 3066 QualType RTy = RHS.get()->getType(); 3067 bool LVoid = LTy->isVoidType(); 3068 bool RVoid = RTy->isVoidType(); 3069 if (LVoid || RVoid) { 3070 // ... then the [l2r] conversions are performed on the second and third 3071 // operands ... 3072 LHS = DefaultFunctionArrayLvalueConversion(LHS.take()); 3073 RHS = DefaultFunctionArrayLvalueConversion(RHS.take()); 3074 if (LHS.isInvalid() || RHS.isInvalid()) 3075 return QualType(); 3076 LTy = LHS.get()->getType(); 3077 RTy = RHS.get()->getType(); 3078 3079 // ... and one of the following shall hold: 3080 // -- The second or the third operand (but not both) is a throw- 3081 // expression; the result is of the type of the other and is an rvalue. 3082 bool LThrow = isa<CXXThrowExpr>(LHS.get()); 3083 bool RThrow = isa<CXXThrowExpr>(RHS.get()); 3084 if (LThrow && !RThrow) 3085 return RTy; 3086 if (RThrow && !LThrow) 3087 return LTy; 3088 3089 // -- Both the second and third operands have type void; the result is of 3090 // type void and is an rvalue. 3091 if (LVoid && RVoid) 3092 return Context.VoidTy; 3093 3094 // Neither holds, error. 3095 Diag(QuestionLoc, diag::err_conditional_void_nonvoid) 3096 << (LVoid ? RTy : LTy) << (LVoid ? 0 : 1) 3097 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange(); 3098 return QualType(); 3099 } 3100 3101 // Neither is void. 3102 3103 // C++0x 5.16p3 3104 // Otherwise, if the second and third operand have different types, and 3105 // either has (cv) class type, and attempt is made to convert each of those 3106 // operands to the other. 3107 if (!Context.hasSameType(LTy, RTy) && 3108 (LTy->isRecordType() || RTy->isRecordType())) { 3109 ImplicitConversionSequence ICSLeftToRight, ICSRightToLeft; 3110 // These return true if a single direction is already ambiguous. 3111 QualType L2RType, R2LType; 3112 bool HaveL2R, HaveR2L; 3113 if (TryClassUnification(*this, LHS.get(), RHS.get(), QuestionLoc, HaveL2R, L2RType)) 3114 return QualType(); 3115 if (TryClassUnification(*this, RHS.get(), LHS.get(), QuestionLoc, HaveR2L, R2LType)) 3116 return QualType(); 3117 3118 // If both can be converted, [...] the program is ill-formed. 3119 if (HaveL2R && HaveR2L) { 3120 Diag(QuestionLoc, diag::err_conditional_ambiguous) 3121 << LTy << RTy << LHS.get()->getSourceRange() << RHS.get()->getSourceRange(); 3122 return QualType(); 3123 } 3124 3125 // If exactly one conversion is possible, that conversion is applied to 3126 // the chosen operand and the converted operands are used in place of the 3127 // original operands for the remainder of this section. 3128 if (HaveL2R) { 3129 if (ConvertForConditional(*this, LHS, L2RType) || LHS.isInvalid()) 3130 return QualType(); 3131 LTy = LHS.get()->getType(); 3132 } else if (HaveR2L) { 3133 if (ConvertForConditional(*this, RHS, R2LType) || RHS.isInvalid()) 3134 return QualType(); 3135 RTy = RHS.get()->getType(); 3136 } 3137 } 3138 3139 // C++0x 5.16p4 3140 // If the second and third operands are glvalues of the same value 3141 // category and have the same type, the result is of that type and 3142 // value category and it is a bit-field if the second or the third 3143 // operand is a bit-field, or if both are bit-fields. 3144 // We only extend this to bitfields, not to the crazy other kinds of 3145 // l-values. 3146 bool Same = Context.hasSameType(LTy, RTy); 3147 if (Same && 3148 LHS.get()->isGLValue() && 3149 LHS.get()->getValueKind() == RHS.get()->getValueKind() && 3150 LHS.get()->isOrdinaryOrBitFieldObject() && 3151 RHS.get()->isOrdinaryOrBitFieldObject()) { 3152 VK = LHS.get()->getValueKind(); 3153 if (LHS.get()->getObjectKind() == OK_BitField || 3154 RHS.get()->getObjectKind() == OK_BitField) 3155 OK = OK_BitField; 3156 return LTy; 3157 } 3158 3159 // C++0x 5.16p5 3160 // Otherwise, the result is an rvalue. If the second and third operands 3161 // do not have the same type, and either has (cv) class type, ... 3162 if (!Same && (LTy->isRecordType() || RTy->isRecordType())) { 3163 // ... overload resolution is used to determine the conversions (if any) 3164 // to be applied to the operands. If the overload resolution fails, the 3165 // program is ill-formed. 3166 if (FindConditionalOverload(*this, LHS, RHS, QuestionLoc)) 3167 return QualType(); 3168 } 3169 3170 // C++0x 5.16p6 3171 // LValue-to-rvalue, array-to-pointer, and function-to-pointer standard 3172 // conversions are performed on the second and third operands. 3173 LHS = DefaultFunctionArrayLvalueConversion(LHS.take()); 3174 RHS = DefaultFunctionArrayLvalueConversion(RHS.take()); 3175 if (LHS.isInvalid() || RHS.isInvalid()) 3176 return QualType(); 3177 LTy = LHS.get()->getType(); 3178 RTy = RHS.get()->getType(); 3179 3180 // After those conversions, one of the following shall hold: 3181 // -- The second and third operands have the same type; the result 3182 // is of that type. If the operands have class type, the result 3183 // is a prvalue temporary of the result type, which is 3184 // copy-initialized from either the second operand or the third 3185 // operand depending on the value of the first operand. 3186 if (Context.getCanonicalType(LTy) == Context.getCanonicalType(RTy)) { 3187 if (LTy->isRecordType()) { 3188 // The operands have class type. Make a temporary copy. 3189 InitializedEntity Entity = InitializedEntity::InitializeTemporary(LTy); 3190 ExprResult LHSCopy = PerformCopyInitialization(Entity, 3191 SourceLocation(), 3192 LHS); 3193 if (LHSCopy.isInvalid()) 3194 return QualType(); 3195 3196 ExprResult RHSCopy = PerformCopyInitialization(Entity, 3197 SourceLocation(), 3198 RHS); 3199 if (RHSCopy.isInvalid()) 3200 return QualType(); 3201 3202 LHS = LHSCopy; 3203 RHS = RHSCopy; 3204 } 3205 3206 return LTy; 3207 } 3208 3209 // Extension: conditional operator involving vector types. 3210 if (LTy->isVectorType() || RTy->isVectorType()) 3211 return CheckVectorOperands(QuestionLoc, LHS, RHS); 3212 3213 // -- The second and third operands have arithmetic or enumeration type; 3214 // the usual arithmetic conversions are performed to bring them to a 3215 // common type, and the result is of that type. 3216 if (LTy->isArithmeticType() && RTy->isArithmeticType()) { 3217 UsualArithmeticConversions(LHS, RHS); 3218 if (LHS.isInvalid() || RHS.isInvalid()) 3219 return QualType(); 3220 return LHS.get()->getType(); 3221 } 3222 3223 // -- The second and third operands have pointer type, or one has pointer 3224 // type and the other is a null pointer constant; pointer conversions 3225 // and qualification conversions are performed to bring them to their 3226 // composite pointer type. The result is of the composite pointer type. 3227 // -- The second and third operands have pointer to member type, or one has 3228 // pointer to member type and the other is a null pointer constant; 3229 // pointer to member conversions and qualification conversions are 3230 // performed to bring them to a common type, whose cv-qualification 3231 // shall match the cv-qualification of either the second or the third 3232 // operand. The result is of the common type. 3233 bool NonStandardCompositeType = false; 3234 QualType Composite = FindCompositePointerType(QuestionLoc, LHS, RHS, 3235 isSFINAEContext()? 0 : &NonStandardCompositeType); 3236 if (!Composite.isNull()) { 3237 if (NonStandardCompositeType) 3238 Diag(QuestionLoc, 3239 diag::ext_typecheck_cond_incompatible_operands_nonstandard) 3240 << LTy << RTy << Composite 3241 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange(); 3242 3243 return Composite; 3244 } 3245 3246 // Similarly, attempt to find composite type of two objective-c pointers. 3247 Composite = FindCompositeObjCPointerType(LHS, RHS, QuestionLoc); 3248 if (!Composite.isNull()) 3249 return Composite; 3250 3251 // Check if we are using a null with a non-pointer type. 3252 if (DiagnoseConditionalForNull(LHS.get(), RHS.get(), QuestionLoc)) 3253 return QualType(); 3254 3255 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 3256 << LHS.get()->getType() << RHS.get()->getType() 3257 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange(); 3258 return QualType(); 3259} 3260 3261/// \brief Find a merged pointer type and convert the two expressions to it. 3262/// 3263/// This finds the composite pointer type (or member pointer type) for @p E1 3264/// and @p E2 according to C++0x 5.9p2. It converts both expressions to this 3265/// type and returns it. 3266/// It does not emit diagnostics. 3267/// 3268/// \param Loc The location of the operator requiring these two expressions to 3269/// be converted to the composite pointer type. 3270/// 3271/// If \p NonStandardCompositeType is non-NULL, then we are permitted to find 3272/// a non-standard (but still sane) composite type to which both expressions 3273/// can be converted. When such a type is chosen, \c *NonStandardCompositeType 3274/// will be set true. 3275QualType Sema::FindCompositePointerType(SourceLocation Loc, 3276 Expr *&E1, Expr *&E2, 3277 bool *NonStandardCompositeType) { 3278 if (NonStandardCompositeType) 3279 *NonStandardCompositeType = false; 3280 3281 assert(getLangOptions().CPlusPlus && "This function assumes C++"); 3282 QualType T1 = E1->getType(), T2 = E2->getType(); 3283 3284 if (!T1->isAnyPointerType() && !T1->isMemberPointerType() && 3285 !T2->isAnyPointerType() && !T2->isMemberPointerType()) 3286 return QualType(); 3287 3288 // C++0x 5.9p2 3289 // Pointer conversions and qualification conversions are performed on 3290 // pointer operands to bring them to their composite pointer type. If 3291 // one operand is a null pointer constant, the composite pointer type is 3292 // the type of the other operand. 3293 if (E1->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) { 3294 if (T2->isMemberPointerType()) 3295 E1 = ImpCastExprToType(E1, T2, CK_NullToMemberPointer).take(); 3296 else 3297 E1 = ImpCastExprToType(E1, T2, CK_NullToPointer).take(); 3298 return T2; 3299 } 3300 if (E2->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) { 3301 if (T1->isMemberPointerType()) 3302 E2 = ImpCastExprToType(E2, T1, CK_NullToMemberPointer).take(); 3303 else 3304 E2 = ImpCastExprToType(E2, T1, CK_NullToPointer).take(); 3305 return T1; 3306 } 3307 3308 // Now both have to be pointers or member pointers. 3309 if ((!T1->isPointerType() && !T1->isMemberPointerType()) || 3310 (!T2->isPointerType() && !T2->isMemberPointerType())) 3311 return QualType(); 3312 3313 // Otherwise, of one of the operands has type "pointer to cv1 void," then 3314 // the other has type "pointer to cv2 T" and the composite pointer type is 3315 // "pointer to cv12 void," where cv12 is the union of cv1 and cv2. 3316 // Otherwise, the composite pointer type is a pointer type similar to the 3317 // type of one of the operands, with a cv-qualification signature that is 3318 // the union of the cv-qualification signatures of the operand types. 3319 // In practice, the first part here is redundant; it's subsumed by the second. 3320 // What we do here is, we build the two possible composite types, and try the 3321 // conversions in both directions. If only one works, or if the two composite 3322 // types are the same, we have succeeded. 3323 // FIXME: extended qualifiers? 3324 typedef llvm::SmallVector<unsigned, 4> QualifierVector; 3325 QualifierVector QualifierUnion; 3326 typedef llvm::SmallVector<std::pair<const Type *, const Type *>, 4> 3327 ContainingClassVector; 3328 ContainingClassVector MemberOfClass; 3329 QualType Composite1 = Context.getCanonicalType(T1), 3330 Composite2 = Context.getCanonicalType(T2); 3331 unsigned NeedConstBefore = 0; 3332 do { 3333 const PointerType *Ptr1, *Ptr2; 3334 if ((Ptr1 = Composite1->getAs<PointerType>()) && 3335 (Ptr2 = Composite2->getAs<PointerType>())) { 3336 Composite1 = Ptr1->getPointeeType(); 3337 Composite2 = Ptr2->getPointeeType(); 3338 3339 // If we're allowed to create a non-standard composite type, keep track 3340 // of where we need to fill in additional 'const' qualifiers. 3341 if (NonStandardCompositeType && 3342 Composite1.getCVRQualifiers() != Composite2.getCVRQualifiers()) 3343 NeedConstBefore = QualifierUnion.size(); 3344 3345 QualifierUnion.push_back( 3346 Composite1.getCVRQualifiers() | Composite2.getCVRQualifiers()); 3347 MemberOfClass.push_back(std::make_pair((const Type *)0, (const Type *)0)); 3348 continue; 3349 } 3350 3351 const MemberPointerType *MemPtr1, *MemPtr2; 3352 if ((MemPtr1 = Composite1->getAs<MemberPointerType>()) && 3353 (MemPtr2 = Composite2->getAs<MemberPointerType>())) { 3354 Composite1 = MemPtr1->getPointeeType(); 3355 Composite2 = MemPtr2->getPointeeType(); 3356 3357 // If we're allowed to create a non-standard composite type, keep track 3358 // of where we need to fill in additional 'const' qualifiers. 3359 if (NonStandardCompositeType && 3360 Composite1.getCVRQualifiers() != Composite2.getCVRQualifiers()) 3361 NeedConstBefore = QualifierUnion.size(); 3362 3363 QualifierUnion.push_back( 3364 Composite1.getCVRQualifiers() | Composite2.getCVRQualifiers()); 3365 MemberOfClass.push_back(std::make_pair(MemPtr1->getClass(), 3366 MemPtr2->getClass())); 3367 continue; 3368 } 3369 3370 // FIXME: block pointer types? 3371 3372 // Cannot unwrap any more types. 3373 break; 3374 } while (true); 3375 3376 if (NeedConstBefore && NonStandardCompositeType) { 3377 // Extension: Add 'const' to qualifiers that come before the first qualifier 3378 // mismatch, so that our (non-standard!) composite type meets the 3379 // requirements of C++ [conv.qual]p4 bullet 3. 3380 for (unsigned I = 0; I != NeedConstBefore; ++I) { 3381 if ((QualifierUnion[I] & Qualifiers::Const) == 0) { 3382 QualifierUnion[I] = QualifierUnion[I] | Qualifiers::Const; 3383 *NonStandardCompositeType = true; 3384 } 3385 } 3386 } 3387 3388 // Rewrap the composites as pointers or member pointers with the union CVRs. 3389 ContainingClassVector::reverse_iterator MOC 3390 = MemberOfClass.rbegin(); 3391 for (QualifierVector::reverse_iterator 3392 I = QualifierUnion.rbegin(), 3393 E = QualifierUnion.rend(); 3394 I != E; (void)++I, ++MOC) { 3395 Qualifiers Quals = Qualifiers::fromCVRMask(*I); 3396 if (MOC->first && MOC->second) { 3397 // Rebuild member pointer type 3398 Composite1 = Context.getMemberPointerType( 3399 Context.getQualifiedType(Composite1, Quals), 3400 MOC->first); 3401 Composite2 = Context.getMemberPointerType( 3402 Context.getQualifiedType(Composite2, Quals), 3403 MOC->second); 3404 } else { 3405 // Rebuild pointer type 3406 Composite1 3407 = Context.getPointerType(Context.getQualifiedType(Composite1, Quals)); 3408 Composite2 3409 = Context.getPointerType(Context.getQualifiedType(Composite2, Quals)); 3410 } 3411 } 3412 3413 // Try to convert to the first composite pointer type. 3414 InitializedEntity Entity1 3415 = InitializedEntity::InitializeTemporary(Composite1); 3416 InitializationKind Kind 3417 = InitializationKind::CreateCopy(Loc, SourceLocation()); 3418 InitializationSequence E1ToC1(*this, Entity1, Kind, &E1, 1); 3419 InitializationSequence E2ToC1(*this, Entity1, Kind, &E2, 1); 3420 3421 if (E1ToC1 && E2ToC1) { 3422 // Conversion to Composite1 is viable. 3423 if (!Context.hasSameType(Composite1, Composite2)) { 3424 // Composite2 is a different type from Composite1. Check whether 3425 // Composite2 is also viable. 3426 InitializedEntity Entity2 3427 = InitializedEntity::InitializeTemporary(Composite2); 3428 InitializationSequence E1ToC2(*this, Entity2, Kind, &E1, 1); 3429 InitializationSequence E2ToC2(*this, Entity2, Kind, &E2, 1); 3430 if (E1ToC2 && E2ToC2) { 3431 // Both Composite1 and Composite2 are viable and are different; 3432 // this is an ambiguity. 3433 return QualType(); 3434 } 3435 } 3436 3437 // Convert E1 to Composite1 3438 ExprResult E1Result 3439 = E1ToC1.Perform(*this, Entity1, Kind, MultiExprArg(*this,&E1,1)); 3440 if (E1Result.isInvalid()) 3441 return QualType(); 3442 E1 = E1Result.takeAs<Expr>(); 3443 3444 // Convert E2 to Composite1 3445 ExprResult E2Result 3446 = E2ToC1.Perform(*this, Entity1, Kind, MultiExprArg(*this,&E2,1)); 3447 if (E2Result.isInvalid()) 3448 return QualType(); 3449 E2 = E2Result.takeAs<Expr>(); 3450 3451 return Composite1; 3452 } 3453 3454 // Check whether Composite2 is viable. 3455 InitializedEntity Entity2 3456 = InitializedEntity::InitializeTemporary(Composite2); 3457 InitializationSequence E1ToC2(*this, Entity2, Kind, &E1, 1); 3458 InitializationSequence E2ToC2(*this, Entity2, Kind, &E2, 1); 3459 if (!E1ToC2 || !E2ToC2) 3460 return QualType(); 3461 3462 // Convert E1 to Composite2 3463 ExprResult E1Result 3464 = E1ToC2.Perform(*this, Entity2, Kind, MultiExprArg(*this, &E1, 1)); 3465 if (E1Result.isInvalid()) 3466 return QualType(); 3467 E1 = E1Result.takeAs<Expr>(); 3468 3469 // Convert E2 to Composite2 3470 ExprResult E2Result 3471 = E2ToC2.Perform(*this, Entity2, Kind, MultiExprArg(*this, &E2, 1)); 3472 if (E2Result.isInvalid()) 3473 return QualType(); 3474 E2 = E2Result.takeAs<Expr>(); 3475 3476 return Composite2; 3477} 3478 3479ExprResult Sema::MaybeBindToTemporary(Expr *E) { 3480 if (!E) 3481 return ExprError(); 3482 3483 if (!Context.getLangOptions().CPlusPlus) 3484 return Owned(E); 3485 3486 assert(!isa<CXXBindTemporaryExpr>(E) && "Double-bound temporary?"); 3487 3488 const RecordType *RT = E->getType()->getAs<RecordType>(); 3489 if (!RT) 3490 return Owned(E); 3491 3492 // If the result is a glvalue, we shouldn't bind it. 3493 if (E->Classify(Context).isGLValue()) 3494 return Owned(E); 3495 3496 // That should be enough to guarantee that this type is complete. 3497 // If it has a trivial destructor, we can avoid the extra copy. 3498 CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3499 if (RD->isInvalidDecl() || RD->hasTrivialDestructor()) 3500 return Owned(E); 3501 3502 CXXTemporary *Temp = CXXTemporary::Create(Context, LookupDestructor(RD)); 3503 ExprTemporaries.push_back(Temp); 3504 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 3505 MarkDeclarationReferenced(E->getExprLoc(), Destructor); 3506 CheckDestructorAccess(E->getExprLoc(), Destructor, 3507 PDiag(diag::err_access_dtor_temp) 3508 << E->getType()); 3509 } 3510 // FIXME: Add the temporary to the temporaries vector. 3511 return Owned(CXXBindTemporaryExpr::Create(Context, Temp, E)); 3512} 3513 3514Expr *Sema::MaybeCreateExprWithCleanups(Expr *SubExpr) { 3515 assert(SubExpr && "sub expression can't be null!"); 3516 3517 unsigned FirstTemporary = ExprEvalContexts.back().NumTemporaries; 3518 assert(ExprTemporaries.size() >= FirstTemporary); 3519 if (ExprTemporaries.size() == FirstTemporary) 3520 return SubExpr; 3521 3522 Expr *E = ExprWithCleanups::Create(Context, SubExpr, 3523 &ExprTemporaries[FirstTemporary], 3524 ExprTemporaries.size() - FirstTemporary); 3525 ExprTemporaries.erase(ExprTemporaries.begin() + FirstTemporary, 3526 ExprTemporaries.end()); 3527 3528 return E; 3529} 3530 3531ExprResult 3532Sema::MaybeCreateExprWithCleanups(ExprResult SubExpr) { 3533 if (SubExpr.isInvalid()) 3534 return ExprError(); 3535 3536 return Owned(MaybeCreateExprWithCleanups(SubExpr.take())); 3537} 3538 3539Stmt *Sema::MaybeCreateStmtWithCleanups(Stmt *SubStmt) { 3540 assert(SubStmt && "sub statement can't be null!"); 3541 3542 unsigned FirstTemporary = ExprEvalContexts.back().NumTemporaries; 3543 assert(ExprTemporaries.size() >= FirstTemporary); 3544 if (ExprTemporaries.size() == FirstTemporary) 3545 return SubStmt; 3546 3547 // FIXME: In order to attach the temporaries, wrap the statement into 3548 // a StmtExpr; currently this is only used for asm statements. 3549 // This is hacky, either create a new CXXStmtWithTemporaries statement or 3550 // a new AsmStmtWithTemporaries. 3551 CompoundStmt *CompStmt = new (Context) CompoundStmt(Context, &SubStmt, 1, 3552 SourceLocation(), 3553 SourceLocation()); 3554 Expr *E = new (Context) StmtExpr(CompStmt, Context.VoidTy, SourceLocation(), 3555 SourceLocation()); 3556 return MaybeCreateExprWithCleanups(E); 3557} 3558 3559ExprResult 3560Sema::ActOnStartCXXMemberReference(Scope *S, Expr *Base, SourceLocation OpLoc, 3561 tok::TokenKind OpKind, ParsedType &ObjectType, 3562 bool &MayBePseudoDestructor) { 3563 // Since this might be a postfix expression, get rid of ParenListExprs. 3564 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Base); 3565 if (Result.isInvalid()) return ExprError(); 3566 Base = Result.get(); 3567 3568 QualType BaseType = Base->getType(); 3569 MayBePseudoDestructor = false; 3570 if (BaseType->isDependentType()) { 3571 // If we have a pointer to a dependent type and are using the -> operator, 3572 // the object type is the type that the pointer points to. We might still 3573 // have enough information about that type to do something useful. 3574 if (OpKind == tok::arrow) 3575 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) 3576 BaseType = Ptr->getPointeeType(); 3577 3578 ObjectType = ParsedType::make(BaseType); 3579 MayBePseudoDestructor = true; 3580 return Owned(Base); 3581 } 3582 3583 // C++ [over.match.oper]p8: 3584 // [...] When operator->returns, the operator-> is applied to the value 3585 // returned, with the original second operand. 3586 if (OpKind == tok::arrow) { 3587 // The set of types we've considered so far. 3588 llvm::SmallPtrSet<CanQualType,8> CTypes; 3589 llvm::SmallVector<SourceLocation, 8> Locations; 3590 CTypes.insert(Context.getCanonicalType(BaseType)); 3591 3592 while (BaseType->isRecordType()) { 3593 Result = BuildOverloadedArrowExpr(S, Base, OpLoc); 3594 if (Result.isInvalid()) 3595 return ExprError(); 3596 Base = Result.get(); 3597 if (CXXOperatorCallExpr *OpCall = dyn_cast<CXXOperatorCallExpr>(Base)) 3598 Locations.push_back(OpCall->getDirectCallee()->getLocation()); 3599 BaseType = Base->getType(); 3600 CanQualType CBaseType = Context.getCanonicalType(BaseType); 3601 if (!CTypes.insert(CBaseType)) { 3602 Diag(OpLoc, diag::err_operator_arrow_circular); 3603 for (unsigned i = 0; i < Locations.size(); i++) 3604 Diag(Locations[i], diag::note_declared_at); 3605 return ExprError(); 3606 } 3607 } 3608 3609 if (BaseType->isPointerType()) 3610 BaseType = BaseType->getPointeeType(); 3611 } 3612 3613 // We could end up with various non-record types here, such as extended 3614 // vector types or Objective-C interfaces. Just return early and let 3615 // ActOnMemberReferenceExpr do the work. 3616 if (!BaseType->isRecordType()) { 3617 // C++ [basic.lookup.classref]p2: 3618 // [...] If the type of the object expression is of pointer to scalar 3619 // type, the unqualified-id is looked up in the context of the complete 3620 // postfix-expression. 3621 // 3622 // This also indicates that we should be parsing a 3623 // pseudo-destructor-name. 3624 ObjectType = ParsedType(); 3625 MayBePseudoDestructor = true; 3626 return Owned(Base); 3627 } 3628 3629 // The object type must be complete (or dependent). 3630 if (!BaseType->isDependentType() && 3631 RequireCompleteType(OpLoc, BaseType, 3632 PDiag(diag::err_incomplete_member_access))) 3633 return ExprError(); 3634 3635 // C++ [basic.lookup.classref]p2: 3636 // If the id-expression in a class member access (5.2.5) is an 3637 // unqualified-id, and the type of the object expression is of a class 3638 // type C (or of pointer to a class type C), the unqualified-id is looked 3639 // up in the scope of class C. [...] 3640 ObjectType = ParsedType::make(BaseType); 3641 return move(Base); 3642} 3643 3644ExprResult Sema::DiagnoseDtorReference(SourceLocation NameLoc, 3645 Expr *MemExpr) { 3646 SourceLocation ExpectedLParenLoc = PP.getLocForEndOfToken(NameLoc); 3647 Diag(MemExpr->getLocStart(), diag::err_dtor_expr_without_call) 3648 << isa<CXXPseudoDestructorExpr>(MemExpr) 3649 << FixItHint::CreateInsertion(ExpectedLParenLoc, "()"); 3650 3651 return ActOnCallExpr(/*Scope*/ 0, 3652 MemExpr, 3653 /*LPLoc*/ ExpectedLParenLoc, 3654 MultiExprArg(), 3655 /*RPLoc*/ ExpectedLParenLoc); 3656} 3657 3658ExprResult Sema::BuildPseudoDestructorExpr(Expr *Base, 3659 SourceLocation OpLoc, 3660 tok::TokenKind OpKind, 3661 const CXXScopeSpec &SS, 3662 TypeSourceInfo *ScopeTypeInfo, 3663 SourceLocation CCLoc, 3664 SourceLocation TildeLoc, 3665 PseudoDestructorTypeStorage Destructed, 3666 bool HasTrailingLParen) { 3667 TypeSourceInfo *DestructedTypeInfo = Destructed.getTypeSourceInfo(); 3668 3669 // C++ [expr.pseudo]p2: 3670 // The left-hand side of the dot operator shall be of scalar type. The 3671 // left-hand side of the arrow operator shall be of pointer to scalar type. 3672 // This scalar type is the object type. 3673 QualType ObjectType = Base->getType(); 3674 if (OpKind == tok::arrow) { 3675 if (const PointerType *Ptr = ObjectType->getAs<PointerType>()) { 3676 ObjectType = Ptr->getPointeeType(); 3677 } else if (!Base->isTypeDependent()) { 3678 // The user wrote "p->" when she probably meant "p."; fix it. 3679 Diag(OpLoc, diag::err_typecheck_member_reference_suggestion) 3680 << ObjectType << true 3681 << FixItHint::CreateReplacement(OpLoc, "."); 3682 if (isSFINAEContext()) 3683 return ExprError(); 3684 3685 OpKind = tok::period; 3686 } 3687 } 3688 3689 if (!ObjectType->isDependentType() && !ObjectType->isScalarType()) { 3690 Diag(OpLoc, diag::err_pseudo_dtor_base_not_scalar) 3691 << ObjectType << Base->getSourceRange(); 3692 return ExprError(); 3693 } 3694 3695 // C++ [expr.pseudo]p2: 3696 // [...] The cv-unqualified versions of the object type and of the type 3697 // designated by the pseudo-destructor-name shall be the same type. 3698 if (DestructedTypeInfo) { 3699 QualType DestructedType = DestructedTypeInfo->getType(); 3700 SourceLocation DestructedTypeStart 3701 = DestructedTypeInfo->getTypeLoc().getLocalSourceRange().getBegin(); 3702 if (!DestructedType->isDependentType() && !ObjectType->isDependentType() && 3703 !Context.hasSameUnqualifiedType(DestructedType, ObjectType)) { 3704 Diag(DestructedTypeStart, diag::err_pseudo_dtor_type_mismatch) 3705 << ObjectType << DestructedType << Base->getSourceRange() 3706 << DestructedTypeInfo->getTypeLoc().getLocalSourceRange(); 3707 3708 // Recover by setting the destructed type to the object type. 3709 DestructedType = ObjectType; 3710 DestructedTypeInfo = Context.getTrivialTypeSourceInfo(ObjectType, 3711 DestructedTypeStart); 3712 Destructed = PseudoDestructorTypeStorage(DestructedTypeInfo); 3713 } 3714 } 3715 3716 // C++ [expr.pseudo]p2: 3717 // [...] Furthermore, the two type-names in a pseudo-destructor-name of the 3718 // form 3719 // 3720 // ::[opt] nested-name-specifier[opt] type-name :: ~ type-name 3721 // 3722 // shall designate the same scalar type. 3723 if (ScopeTypeInfo) { 3724 QualType ScopeType = ScopeTypeInfo->getType(); 3725 if (!ScopeType->isDependentType() && !ObjectType->isDependentType() && 3726 !Context.hasSameUnqualifiedType(ScopeType, ObjectType)) { 3727 3728 Diag(ScopeTypeInfo->getTypeLoc().getLocalSourceRange().getBegin(), 3729 diag::err_pseudo_dtor_type_mismatch) 3730 << ObjectType << ScopeType << Base->getSourceRange() 3731 << ScopeTypeInfo->getTypeLoc().getLocalSourceRange(); 3732 3733 ScopeType = QualType(); 3734 ScopeTypeInfo = 0; 3735 } 3736 } 3737 3738 Expr *Result 3739 = new (Context) CXXPseudoDestructorExpr(Context, Base, 3740 OpKind == tok::arrow, OpLoc, 3741 SS.getWithLocInContext(Context), 3742 ScopeTypeInfo, 3743 CCLoc, 3744 TildeLoc, 3745 Destructed); 3746 3747 if (HasTrailingLParen) 3748 return Owned(Result); 3749 3750 return DiagnoseDtorReference(Destructed.getLocation(), Result); 3751} 3752 3753ExprResult Sema::ActOnPseudoDestructorExpr(Scope *S, Expr *Base, 3754 SourceLocation OpLoc, 3755 tok::TokenKind OpKind, 3756 CXXScopeSpec &SS, 3757 UnqualifiedId &FirstTypeName, 3758 SourceLocation CCLoc, 3759 SourceLocation TildeLoc, 3760 UnqualifiedId &SecondTypeName, 3761 bool HasTrailingLParen) { 3762 assert((FirstTypeName.getKind() == UnqualifiedId::IK_TemplateId || 3763 FirstTypeName.getKind() == UnqualifiedId::IK_Identifier) && 3764 "Invalid first type name in pseudo-destructor"); 3765 assert((SecondTypeName.getKind() == UnqualifiedId::IK_TemplateId || 3766 SecondTypeName.getKind() == UnqualifiedId::IK_Identifier) && 3767 "Invalid second type name in pseudo-destructor"); 3768 3769 // C++ [expr.pseudo]p2: 3770 // The left-hand side of the dot operator shall be of scalar type. The 3771 // left-hand side of the arrow operator shall be of pointer to scalar type. 3772 // This scalar type is the object type. 3773 QualType ObjectType = Base->getType(); 3774 if (OpKind == tok::arrow) { 3775 if (const PointerType *Ptr = ObjectType->getAs<PointerType>()) { 3776 ObjectType = Ptr->getPointeeType(); 3777 } else if (!ObjectType->isDependentType()) { 3778 // The user wrote "p->" when she probably meant "p."; fix it. 3779 Diag(OpLoc, diag::err_typecheck_member_reference_suggestion) 3780 << ObjectType << true 3781 << FixItHint::CreateReplacement(OpLoc, "."); 3782 if (isSFINAEContext()) 3783 return ExprError(); 3784 3785 OpKind = tok::period; 3786 } 3787 } 3788 3789 // Compute the object type that we should use for name lookup purposes. Only 3790 // record types and dependent types matter. 3791 ParsedType ObjectTypePtrForLookup; 3792 if (!SS.isSet()) { 3793 if (ObjectType->isRecordType()) 3794 ObjectTypePtrForLookup = ParsedType::make(ObjectType); 3795 else if (ObjectType->isDependentType()) 3796 ObjectTypePtrForLookup = ParsedType::make(Context.DependentTy); 3797 } 3798 3799 // Convert the name of the type being destructed (following the ~) into a 3800 // type (with source-location information). 3801 QualType DestructedType; 3802 TypeSourceInfo *DestructedTypeInfo = 0; 3803 PseudoDestructorTypeStorage Destructed; 3804 if (SecondTypeName.getKind() == UnqualifiedId::IK_Identifier) { 3805 ParsedType T = getTypeName(*SecondTypeName.Identifier, 3806 SecondTypeName.StartLocation, 3807 S, &SS, true, false, ObjectTypePtrForLookup); 3808 if (!T && 3809 ((SS.isSet() && !computeDeclContext(SS, false)) || 3810 (!SS.isSet() && ObjectType->isDependentType()))) { 3811 // The name of the type being destroyed is a dependent name, and we 3812 // couldn't find anything useful in scope. Just store the identifier and 3813 // it's location, and we'll perform (qualified) name lookup again at 3814 // template instantiation time. 3815 Destructed = PseudoDestructorTypeStorage(SecondTypeName.Identifier, 3816 SecondTypeName.StartLocation); 3817 } else if (!T) { 3818 Diag(SecondTypeName.StartLocation, 3819 diag::err_pseudo_dtor_destructor_non_type) 3820 << SecondTypeName.Identifier << ObjectType; 3821 if (isSFINAEContext()) 3822 return ExprError(); 3823 3824 // Recover by assuming we had the right type all along. 3825 DestructedType = ObjectType; 3826 } else 3827 DestructedType = GetTypeFromParser(T, &DestructedTypeInfo); 3828 } else { 3829 // Resolve the template-id to a type. 3830 TemplateIdAnnotation *TemplateId = SecondTypeName.TemplateId; 3831 ASTTemplateArgsPtr TemplateArgsPtr(*this, 3832 TemplateId->getTemplateArgs(), 3833 TemplateId->NumArgs); 3834 TypeResult T = ActOnTemplateIdType(TemplateId->SS, 3835 TemplateId->Template, 3836 TemplateId->TemplateNameLoc, 3837 TemplateId->LAngleLoc, 3838 TemplateArgsPtr, 3839 TemplateId->RAngleLoc); 3840 if (T.isInvalid() || !T.get()) { 3841 // Recover by assuming we had the right type all along. 3842 DestructedType = ObjectType; 3843 } else 3844 DestructedType = GetTypeFromParser(T.get(), &DestructedTypeInfo); 3845 } 3846 3847 // If we've performed some kind of recovery, (re-)build the type source 3848 // information. 3849 if (!DestructedType.isNull()) { 3850 if (!DestructedTypeInfo) 3851 DestructedTypeInfo = Context.getTrivialTypeSourceInfo(DestructedType, 3852 SecondTypeName.StartLocation); 3853 Destructed = PseudoDestructorTypeStorage(DestructedTypeInfo); 3854 } 3855 3856 // Convert the name of the scope type (the type prior to '::') into a type. 3857 TypeSourceInfo *ScopeTypeInfo = 0; 3858 QualType ScopeType; 3859 if (FirstTypeName.getKind() == UnqualifiedId::IK_TemplateId || 3860 FirstTypeName.Identifier) { 3861 if (FirstTypeName.getKind() == UnqualifiedId::IK_Identifier) { 3862 ParsedType T = getTypeName(*FirstTypeName.Identifier, 3863 FirstTypeName.StartLocation, 3864 S, &SS, true, false, ObjectTypePtrForLookup); 3865 if (!T) { 3866 Diag(FirstTypeName.StartLocation, 3867 diag::err_pseudo_dtor_destructor_non_type) 3868 << FirstTypeName.Identifier << ObjectType; 3869 3870 if (isSFINAEContext()) 3871 return ExprError(); 3872 3873 // Just drop this type. It's unnecessary anyway. 3874 ScopeType = QualType(); 3875 } else 3876 ScopeType = GetTypeFromParser(T, &ScopeTypeInfo); 3877 } else { 3878 // Resolve the template-id to a type. 3879 TemplateIdAnnotation *TemplateId = FirstTypeName.TemplateId; 3880 ASTTemplateArgsPtr TemplateArgsPtr(*this, 3881 TemplateId->getTemplateArgs(), 3882 TemplateId->NumArgs); 3883 TypeResult T = ActOnTemplateIdType(TemplateId->SS, 3884 TemplateId->Template, 3885 TemplateId->TemplateNameLoc, 3886 TemplateId->LAngleLoc, 3887 TemplateArgsPtr, 3888 TemplateId->RAngleLoc); 3889 if (T.isInvalid() || !T.get()) { 3890 // Recover by dropping this type. 3891 ScopeType = QualType(); 3892 } else 3893 ScopeType = GetTypeFromParser(T.get(), &ScopeTypeInfo); 3894 } 3895 } 3896 3897 if (!ScopeType.isNull() && !ScopeTypeInfo) 3898 ScopeTypeInfo = Context.getTrivialTypeSourceInfo(ScopeType, 3899 FirstTypeName.StartLocation); 3900 3901 3902 return BuildPseudoDestructorExpr(Base, OpLoc, OpKind, SS, 3903 ScopeTypeInfo, CCLoc, TildeLoc, 3904 Destructed, HasTrailingLParen); 3905} 3906 3907ExprResult Sema::BuildCXXMemberCallExpr(Expr *E, NamedDecl *FoundDecl, 3908 CXXMethodDecl *Method) { 3909 ExprResult Exp = PerformObjectArgumentInitialization(E, /*Qualifier=*/0, 3910 FoundDecl, Method); 3911 if (Exp.isInvalid()) 3912 return true; 3913 3914 MemberExpr *ME = 3915 new (Context) MemberExpr(Exp.take(), /*IsArrow=*/false, Method, 3916 SourceLocation(), Method->getType(), 3917 VK_RValue, OK_Ordinary); 3918 QualType ResultType = Method->getResultType(); 3919 ExprValueKind VK = Expr::getValueKindForType(ResultType); 3920 ResultType = ResultType.getNonLValueExprType(Context); 3921 3922 MarkDeclarationReferenced(Exp.get()->getLocStart(), Method); 3923 CXXMemberCallExpr *CE = 3924 new (Context) CXXMemberCallExpr(Context, ME, 0, 0, ResultType, VK, 3925 Exp.get()->getLocEnd()); 3926 return CE; 3927} 3928 3929ExprResult Sema::BuildCXXNoexceptExpr(SourceLocation KeyLoc, Expr *Operand, 3930 SourceLocation RParen) { 3931 return Owned(new (Context) CXXNoexceptExpr(Context.BoolTy, Operand, 3932 Operand->CanThrow(Context), 3933 KeyLoc, RParen)); 3934} 3935 3936ExprResult Sema::ActOnNoexceptExpr(SourceLocation KeyLoc, SourceLocation, 3937 Expr *Operand, SourceLocation RParen) { 3938 return BuildCXXNoexceptExpr(KeyLoc, Operand, RParen); 3939} 3940 3941/// Perform the conversions required for an expression used in a 3942/// context that ignores the result. 3943ExprResult Sema::IgnoredValueConversions(Expr *E) { 3944 // C99 6.3.2.1: 3945 // [Except in specific positions,] an lvalue that does not have 3946 // array type is converted to the value stored in the 3947 // designated object (and is no longer an lvalue). 3948 if (E->isRValue()) return Owned(E); 3949 3950 // We always want to do this on ObjC property references. 3951 if (E->getObjectKind() == OK_ObjCProperty) { 3952 ExprResult Res = ConvertPropertyForRValue(E); 3953 if (Res.isInvalid()) return Owned(E); 3954 E = Res.take(); 3955 if (E->isRValue()) return Owned(E); 3956 } 3957 3958 // Otherwise, this rule does not apply in C++, at least not for the moment. 3959 if (getLangOptions().CPlusPlus) return Owned(E); 3960 3961 // GCC seems to also exclude expressions of incomplete enum type. 3962 if (const EnumType *T = E->getType()->getAs<EnumType>()) { 3963 if (!T->getDecl()->isComplete()) { 3964 // FIXME: stupid workaround for a codegen bug! 3965 E = ImpCastExprToType(E, Context.VoidTy, CK_ToVoid).take(); 3966 return Owned(E); 3967 } 3968 } 3969 3970 ExprResult Res = DefaultFunctionArrayLvalueConversion(E); 3971 if (Res.isInvalid()) 3972 return Owned(E); 3973 E = Res.take(); 3974 3975 if (!E->getType()->isVoidType()) 3976 RequireCompleteType(E->getExprLoc(), E->getType(), 3977 diag::err_incomplete_type); 3978 return Owned(E); 3979} 3980 3981ExprResult Sema::ActOnFinishFullExpr(Expr *FE) { 3982 ExprResult FullExpr = Owned(FE); 3983 3984 if (!FullExpr.get()) 3985 return ExprError(); 3986 3987 if (DiagnoseUnexpandedParameterPack(FullExpr.get())) 3988 return ExprError(); 3989 3990 // 13.4.1 ... An overloaded function name shall not be used without arguments 3991 // in contexts other than those listed [i.e list of targets]. 3992 // 3993 // void foo(); void foo(int); 3994 // template<class T> void fooT(); template<class T> void fooT(int); 3995 3996 // Therefore these should error: 3997 // foo; 3998 // fooT<int>; 3999 4000 if (FullExpr.get()->getType() == Context.OverloadTy) { 4001 ExprResult Fixed 4002 = ResolveAndFixSingleFunctionTemplateSpecialization(FullExpr.get(), 4003 /*DoFunctionPointerConversion=*/false, 4004 /*Complain=*/true, 4005 FullExpr.get()->getSourceRange(), 4006 QualType(), 4007 diag::err_addr_ovl_ambiguous); 4008 if (Fixed.isInvalid()) 4009 return ExprError(); 4010 4011 FullExpr = Fixed.get(); 4012 } 4013 4014 4015 FullExpr = IgnoredValueConversions(FullExpr.take()); 4016 if (FullExpr.isInvalid()) 4017 return ExprError(); 4018 4019 CheckImplicitConversions(FullExpr.get()); 4020 return MaybeCreateExprWithCleanups(FullExpr); 4021} 4022 4023StmtResult Sema::ActOnFinishFullStmt(Stmt *FullStmt) { 4024 if (!FullStmt) return StmtError(); 4025 4026 return MaybeCreateStmtWithCleanups(FullStmt); 4027} 4028