SemaExprCXX.cpp revision 8026f6d82f7fa544bc0453714fe94bca62a1196e
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 ImpCastExprToType(E, UnqualT, CK_NoOp, CastCategory(E)); 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 (!StdNamespace) 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() && CheckCXXThrowOperand(OpLoc, Ex)) 487 return ExprError(); 488 return Owned(new (Context) CXXThrowExpr(Ex, Context.VoidTy, OpLoc)); 489} 490 491/// CheckCXXThrowOperand - Validate the operand of a throw. 492bool Sema::CheckCXXThrowOperand(SourceLocation ThrowLoc, Expr *&E) { 493 // C++ [except.throw]p3: 494 // A throw-expression initializes a temporary object, called the exception 495 // object, the type of which is determined by removing any top-level 496 // cv-qualifiers from the static type of the operand of throw and adjusting 497 // the type from "array of T" or "function returning T" to "pointer to T" 498 // or "pointer to function returning T", [...] 499 if (E->getType().hasQualifiers()) 500 ImpCastExprToType(E, E->getType().getUnqualifiedType(), CK_NoOp, 501 CastCategory(E)); 502 503 DefaultFunctionArrayConversion(E); 504 505 // If the type of the exception would be an incomplete type or a pointer 506 // to an incomplete type other than (cv) void the program is ill-formed. 507 QualType Ty = E->getType(); 508 bool isPointer = false; 509 if (const PointerType* Ptr = Ty->getAs<PointerType>()) { 510 Ty = Ptr->getPointeeType(); 511 isPointer = true; 512 } 513 if (!isPointer || !Ty->isVoidType()) { 514 if (RequireCompleteType(ThrowLoc, Ty, 515 PDiag(isPointer ? diag::err_throw_incomplete_ptr 516 : diag::err_throw_incomplete) 517 << E->getSourceRange())) 518 return true; 519 520 if (RequireNonAbstractType(ThrowLoc, E->getType(), 521 PDiag(diag::err_throw_abstract_type) 522 << E->getSourceRange())) 523 return true; 524 } 525 526 // Initialize the exception result. This implicitly weeds out 527 // abstract types or types with inaccessible copy constructors. 528 const VarDecl *NRVOVariable = getCopyElisionCandidate(QualType(), E, false); 529 530 // FIXME: Determine whether we can elide this copy per C++0x [class.copy]p32. 531 InitializedEntity Entity = 532 InitializedEntity::InitializeException(ThrowLoc, E->getType(), 533 /*NRVO=*/false); 534 ExprResult Res = PerformMoveOrCopyInitialization(Entity, NRVOVariable, 535 QualType(), E); 536 if (Res.isInvalid()) 537 return true; 538 E = Res.takeAs<Expr>(); 539 540 // If the exception has class type, we need additional handling. 541 const RecordType *RecordTy = Ty->getAs<RecordType>(); 542 if (!RecordTy) 543 return false; 544 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 545 546 // If we are throwing a polymorphic class type or pointer thereof, 547 // exception handling will make use of the vtable. 548 MarkVTableUsed(ThrowLoc, RD); 549 550 // If a pointer is thrown, the referenced object will not be destroyed. 551 if (isPointer) 552 return false; 553 554 // If the class has a non-trivial destructor, we must be able to call it. 555 if (RD->hasTrivialDestructor()) 556 return false; 557 558 CXXDestructorDecl *Destructor 559 = const_cast<CXXDestructorDecl*>(LookupDestructor(RD)); 560 if (!Destructor) 561 return false; 562 563 MarkDeclarationReferenced(E->getExprLoc(), Destructor); 564 CheckDestructorAccess(E->getExprLoc(), Destructor, 565 PDiag(diag::err_access_dtor_exception) << Ty); 566 return false; 567} 568 569CXXMethodDecl *Sema::tryCaptureCXXThis() { 570 // Ignore block scopes: we can capture through them. 571 // Ignore nested enum scopes: we'll diagnose non-constant expressions 572 // where they're invalid, and other uses are legitimate. 573 // Don't ignore nested class scopes: you can't use 'this' in a local class. 574 DeclContext *DC = CurContext; 575 while (true) { 576 if (isa<BlockDecl>(DC)) DC = cast<BlockDecl>(DC)->getDeclContext(); 577 else if (isa<EnumDecl>(DC)) DC = cast<EnumDecl>(DC)->getDeclContext(); 578 else break; 579 } 580 581 // If we're not in an instance method, error out. 582 CXXMethodDecl *method = dyn_cast<CXXMethodDecl>(DC); 583 if (!method || !method->isInstance()) 584 return 0; 585 586 // Mark that we're closing on 'this' in all the block scopes, if applicable. 587 for (unsigned idx = FunctionScopes.size() - 1; 588 isa<BlockScopeInfo>(FunctionScopes[idx]); 589 --idx) 590 cast<BlockScopeInfo>(FunctionScopes[idx])->CapturesCXXThis = true; 591 592 return method; 593} 594 595ExprResult Sema::ActOnCXXThis(SourceLocation loc) { 596 /// C++ 9.3.2: In the body of a non-static member function, the keyword this 597 /// is a non-lvalue expression whose value is the address of the object for 598 /// which the function is called. 599 600 CXXMethodDecl *method = tryCaptureCXXThis(); 601 if (!method) return Diag(loc, diag::err_invalid_this_use); 602 603 return Owned(new (Context) CXXThisExpr(loc, method->getThisType(Context), 604 /*isImplicit=*/false)); 605} 606 607ExprResult 608Sema::ActOnCXXTypeConstructExpr(ParsedType TypeRep, 609 SourceLocation LParenLoc, 610 MultiExprArg exprs, 611 SourceLocation RParenLoc) { 612 if (!TypeRep) 613 return ExprError(); 614 615 TypeSourceInfo *TInfo; 616 QualType Ty = GetTypeFromParser(TypeRep, &TInfo); 617 if (!TInfo) 618 TInfo = Context.getTrivialTypeSourceInfo(Ty, SourceLocation()); 619 620 return BuildCXXTypeConstructExpr(TInfo, LParenLoc, exprs, RParenLoc); 621} 622 623/// ActOnCXXTypeConstructExpr - Parse construction of a specified type. 624/// Can be interpreted either as function-style casting ("int(x)") 625/// or class type construction ("ClassType(x,y,z)") 626/// or creation of a value-initialized type ("int()"). 627ExprResult 628Sema::BuildCXXTypeConstructExpr(TypeSourceInfo *TInfo, 629 SourceLocation LParenLoc, 630 MultiExprArg exprs, 631 SourceLocation RParenLoc) { 632 QualType Ty = TInfo->getType(); 633 unsigned NumExprs = exprs.size(); 634 Expr **Exprs = (Expr**)exprs.get(); 635 SourceLocation TyBeginLoc = TInfo->getTypeLoc().getBeginLoc(); 636 SourceRange FullRange = SourceRange(TyBeginLoc, RParenLoc); 637 638 if (Ty->isDependentType() || 639 CallExpr::hasAnyTypeDependentArguments(Exprs, NumExprs)) { 640 exprs.release(); 641 642 return Owned(CXXUnresolvedConstructExpr::Create(Context, TInfo, 643 LParenLoc, 644 Exprs, NumExprs, 645 RParenLoc)); 646 } 647 648 if (Ty->isArrayType()) 649 return ExprError(Diag(TyBeginLoc, 650 diag::err_value_init_for_array_type) << FullRange); 651 if (!Ty->isVoidType() && 652 RequireCompleteType(TyBeginLoc, Ty, 653 PDiag(diag::err_invalid_incomplete_type_use) 654 << FullRange)) 655 return ExprError(); 656 657 if (RequireNonAbstractType(TyBeginLoc, Ty, 658 diag::err_allocation_of_abstract_type)) 659 return ExprError(); 660 661 662 // C++ [expr.type.conv]p1: 663 // If the expression list is a single expression, the type conversion 664 // expression is equivalent (in definedness, and if defined in meaning) to the 665 // corresponding cast expression. 666 // 667 if (NumExprs == 1) { 668 CastKind Kind = CK_Invalid; 669 ExprValueKind VK = VK_RValue; 670 CXXCastPath BasePath; 671 if (CheckCastTypes(TInfo->getTypeLoc().getSourceRange(), Ty, Exprs[0], 672 Kind, VK, BasePath, 673 /*FunctionalStyle=*/true)) 674 return ExprError(); 675 676 exprs.release(); 677 678 return Owned(CXXFunctionalCastExpr::Create(Context, 679 Ty.getNonLValueExprType(Context), 680 VK, TInfo, TyBeginLoc, Kind, 681 Exprs[0], &BasePath, 682 RParenLoc)); 683 } 684 685 InitializedEntity Entity = InitializedEntity::InitializeTemporary(TInfo); 686 InitializationKind Kind 687 = NumExprs ? InitializationKind::CreateDirect(TyBeginLoc, 688 LParenLoc, RParenLoc) 689 : InitializationKind::CreateValue(TyBeginLoc, 690 LParenLoc, RParenLoc); 691 InitializationSequence InitSeq(*this, Entity, Kind, Exprs, NumExprs); 692 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(exprs)); 693 694 // FIXME: Improve AST representation? 695 return move(Result); 696} 697 698/// doesUsualArrayDeleteWantSize - Answers whether the usual 699/// operator delete[] for the given type has a size_t parameter. 700static bool doesUsualArrayDeleteWantSize(Sema &S, SourceLocation loc, 701 QualType allocType) { 702 const RecordType *record = 703 allocType->getBaseElementTypeUnsafe()->getAs<RecordType>(); 704 if (!record) return false; 705 706 // Try to find an operator delete[] in class scope. 707 708 DeclarationName deleteName = 709 S.Context.DeclarationNames.getCXXOperatorName(OO_Array_Delete); 710 LookupResult ops(S, deleteName, loc, Sema::LookupOrdinaryName); 711 S.LookupQualifiedName(ops, record->getDecl()); 712 713 // We're just doing this for information. 714 ops.suppressDiagnostics(); 715 716 // Very likely: there's no operator delete[]. 717 if (ops.empty()) return false; 718 719 // If it's ambiguous, it should be illegal to call operator delete[] 720 // on this thing, so it doesn't matter if we allocate extra space or not. 721 if (ops.isAmbiguous()) return false; 722 723 LookupResult::Filter filter = ops.makeFilter(); 724 while (filter.hasNext()) { 725 NamedDecl *del = filter.next()->getUnderlyingDecl(); 726 727 // C++0x [basic.stc.dynamic.deallocation]p2: 728 // A template instance is never a usual deallocation function, 729 // regardless of its signature. 730 if (isa<FunctionTemplateDecl>(del)) { 731 filter.erase(); 732 continue; 733 } 734 735 // C++0x [basic.stc.dynamic.deallocation]p2: 736 // If class T does not declare [an operator delete[] with one 737 // parameter] but does declare a member deallocation function 738 // named operator delete[] with exactly two parameters, the 739 // second of which has type std::size_t, then this function 740 // is a usual deallocation function. 741 if (!cast<CXXMethodDecl>(del)->isUsualDeallocationFunction()) { 742 filter.erase(); 743 continue; 744 } 745 } 746 filter.done(); 747 748 if (!ops.isSingleResult()) return false; 749 750 const FunctionDecl *del = cast<FunctionDecl>(ops.getFoundDecl()); 751 return (del->getNumParams() == 2); 752} 753 754/// ActOnCXXNew - Parsed a C++ 'new' expression (C++ 5.3.4), as in e.g.: 755/// @code new (memory) int[size][4] @endcode 756/// or 757/// @code ::new Foo(23, "hello") @endcode 758/// For the interpretation of this heap of arguments, consult the base version. 759ExprResult 760Sema::ActOnCXXNew(SourceLocation StartLoc, bool UseGlobal, 761 SourceLocation PlacementLParen, MultiExprArg PlacementArgs, 762 SourceLocation PlacementRParen, SourceRange TypeIdParens, 763 Declarator &D, SourceLocation ConstructorLParen, 764 MultiExprArg ConstructorArgs, 765 SourceLocation ConstructorRParen) { 766 bool TypeContainsAuto = D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto; 767 768 Expr *ArraySize = 0; 769 // If the specified type is an array, unwrap it and save the expression. 770 if (D.getNumTypeObjects() > 0 && 771 D.getTypeObject(0).Kind == DeclaratorChunk::Array) { 772 DeclaratorChunk &Chunk = D.getTypeObject(0); 773 if (TypeContainsAuto) 774 return ExprError(Diag(Chunk.Loc, diag::err_new_array_of_auto) 775 << D.getSourceRange()); 776 if (Chunk.Arr.hasStatic) 777 return ExprError(Diag(Chunk.Loc, diag::err_static_illegal_in_new) 778 << D.getSourceRange()); 779 if (!Chunk.Arr.NumElts) 780 return ExprError(Diag(Chunk.Loc, diag::err_array_new_needs_size) 781 << D.getSourceRange()); 782 783 ArraySize = static_cast<Expr*>(Chunk.Arr.NumElts); 784 D.DropFirstTypeObject(); 785 } 786 787 // Every dimension shall be of constant size. 788 if (ArraySize) { 789 for (unsigned I = 0, N = D.getNumTypeObjects(); I < N; ++I) { 790 if (D.getTypeObject(I).Kind != DeclaratorChunk::Array) 791 break; 792 793 DeclaratorChunk::ArrayTypeInfo &Array = D.getTypeObject(I).Arr; 794 if (Expr *NumElts = (Expr *)Array.NumElts) { 795 if (!NumElts->isTypeDependent() && !NumElts->isValueDependent() && 796 !NumElts->isIntegerConstantExpr(Context)) { 797 Diag(D.getTypeObject(I).Loc, diag::err_new_array_nonconst) 798 << NumElts->getSourceRange(); 799 return ExprError(); 800 } 801 } 802 } 803 } 804 805 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, /*Scope=*/0, /*OwnedDecl=*/0, 806 /*AllowAuto=*/true); 807 QualType AllocType = TInfo->getType(); 808 if (D.isInvalidType()) 809 return ExprError(); 810 811 return BuildCXXNew(StartLoc, UseGlobal, 812 PlacementLParen, 813 move(PlacementArgs), 814 PlacementRParen, 815 TypeIdParens, 816 AllocType, 817 TInfo, 818 ArraySize, 819 ConstructorLParen, 820 move(ConstructorArgs), 821 ConstructorRParen, 822 TypeContainsAuto); 823} 824 825ExprResult 826Sema::BuildCXXNew(SourceLocation StartLoc, bool UseGlobal, 827 SourceLocation PlacementLParen, 828 MultiExprArg PlacementArgs, 829 SourceLocation PlacementRParen, 830 SourceRange TypeIdParens, 831 QualType AllocType, 832 TypeSourceInfo *AllocTypeInfo, 833 Expr *ArraySize, 834 SourceLocation ConstructorLParen, 835 MultiExprArg ConstructorArgs, 836 SourceLocation ConstructorRParen, 837 bool TypeMayContainAuto) { 838 SourceRange TypeRange = AllocTypeInfo->getTypeLoc().getSourceRange(); 839 840 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 841 if (TypeMayContainAuto && AllocType->getContainedAutoType()) { 842 if (ConstructorArgs.size() == 0) 843 return ExprError(Diag(StartLoc, diag::err_auto_new_requires_ctor_arg) 844 << AllocType << TypeRange); 845 if (ConstructorArgs.size() != 1) { 846 Expr *FirstBad = ConstructorArgs.get()[1]; 847 return ExprError(Diag(FirstBad->getSourceRange().getBegin(), 848 diag::err_auto_new_ctor_multiple_expressions) 849 << AllocType << TypeRange); 850 } 851 QualType DeducedType; 852 if (!DeduceAutoType(AllocType, ConstructorArgs.get()[0], DeducedType)) 853 return ExprError(Diag(StartLoc, diag::err_auto_new_deduction_failure) 854 << AllocType 855 << ConstructorArgs.get()[0]->getType() 856 << TypeRange 857 << ConstructorArgs.get()[0]->getSourceRange()); 858 859 AllocType = DeducedType; 860 AllocTypeInfo = Context.getTrivialTypeSourceInfo(AllocType, StartLoc); 861 } 862 863 // Per C++0x [expr.new]p5, the type being constructed may be a 864 // typedef of an array type. 865 if (!ArraySize) { 866 if (const ConstantArrayType *Array 867 = Context.getAsConstantArrayType(AllocType)) { 868 ArraySize = IntegerLiteral::Create(Context, Array->getSize(), 869 Context.getSizeType(), 870 TypeRange.getEnd()); 871 AllocType = Array->getElementType(); 872 } 873 } 874 875 if (CheckAllocatedType(AllocType, TypeRange.getBegin(), TypeRange)) 876 return ExprError(); 877 878 QualType ResultType = Context.getPointerType(AllocType); 879 880 // C++ 5.3.4p6: "The expression in a direct-new-declarator shall have integral 881 // or enumeration type with a non-negative value." 882 if (ArraySize && !ArraySize->isTypeDependent()) { 883 884 QualType SizeType = ArraySize->getType(); 885 886 ExprResult ConvertedSize 887 = ConvertToIntegralOrEnumerationType(StartLoc, ArraySize, 888 PDiag(diag::err_array_size_not_integral), 889 PDiag(diag::err_array_size_incomplete_type) 890 << ArraySize->getSourceRange(), 891 PDiag(diag::err_array_size_explicit_conversion), 892 PDiag(diag::note_array_size_conversion), 893 PDiag(diag::err_array_size_ambiguous_conversion), 894 PDiag(diag::note_array_size_conversion), 895 PDiag(getLangOptions().CPlusPlus0x? 0 896 : diag::ext_array_size_conversion)); 897 if (ConvertedSize.isInvalid()) 898 return ExprError(); 899 900 ArraySize = ConvertedSize.take(); 901 SizeType = ArraySize->getType(); 902 if (!SizeType->isIntegralOrUnscopedEnumerationType()) 903 return ExprError(); 904 905 // Let's see if this is a constant < 0. If so, we reject it out of hand. 906 // We don't care about special rules, so we tell the machinery it's not 907 // evaluated - it gives us a result in more cases. 908 if (!ArraySize->isValueDependent()) { 909 llvm::APSInt Value; 910 if (ArraySize->isIntegerConstantExpr(Value, Context, 0, false)) { 911 if (Value < llvm::APSInt( 912 llvm::APInt::getNullValue(Value.getBitWidth()), 913 Value.isUnsigned())) 914 return ExprError(Diag(ArraySize->getSourceRange().getBegin(), 915 diag::err_typecheck_negative_array_size) 916 << ArraySize->getSourceRange()); 917 918 if (!AllocType->isDependentType()) { 919 unsigned ActiveSizeBits 920 = ConstantArrayType::getNumAddressingBits(Context, AllocType, Value); 921 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 922 Diag(ArraySize->getSourceRange().getBegin(), 923 diag::err_array_too_large) 924 << Value.toString(10) 925 << ArraySize->getSourceRange(); 926 return ExprError(); 927 } 928 } 929 } else if (TypeIdParens.isValid()) { 930 // Can't have dynamic array size when the type-id is in parentheses. 931 Diag(ArraySize->getLocStart(), diag::ext_new_paren_array_nonconst) 932 << ArraySize->getSourceRange() 933 << FixItHint::CreateRemoval(TypeIdParens.getBegin()) 934 << FixItHint::CreateRemoval(TypeIdParens.getEnd()); 935 936 TypeIdParens = SourceRange(); 937 } 938 } 939 940 ImpCastExprToType(ArraySize, Context.getSizeType(), 941 CK_IntegralCast); 942 } 943 944 FunctionDecl *OperatorNew = 0; 945 FunctionDecl *OperatorDelete = 0; 946 Expr **PlaceArgs = (Expr**)PlacementArgs.get(); 947 unsigned NumPlaceArgs = PlacementArgs.size(); 948 949 if (!AllocType->isDependentType() && 950 !Expr::hasAnyTypeDependentArguments(PlaceArgs, NumPlaceArgs) && 951 FindAllocationFunctions(StartLoc, 952 SourceRange(PlacementLParen, PlacementRParen), 953 UseGlobal, AllocType, ArraySize, PlaceArgs, 954 NumPlaceArgs, OperatorNew, OperatorDelete)) 955 return ExprError(); 956 957 // If this is an array allocation, compute whether the usual array 958 // deallocation function for the type has a size_t parameter. 959 bool UsualArrayDeleteWantsSize = false; 960 if (ArraySize && !AllocType->isDependentType()) 961 UsualArrayDeleteWantsSize 962 = doesUsualArrayDeleteWantSize(*this, StartLoc, AllocType); 963 964 llvm::SmallVector<Expr *, 8> AllPlaceArgs; 965 if (OperatorNew) { 966 // Add default arguments, if any. 967 const FunctionProtoType *Proto = 968 OperatorNew->getType()->getAs<FunctionProtoType>(); 969 VariadicCallType CallType = 970 Proto->isVariadic() ? VariadicFunction : VariadicDoesNotApply; 971 972 if (GatherArgumentsForCall(PlacementLParen, OperatorNew, 973 Proto, 1, PlaceArgs, NumPlaceArgs, 974 AllPlaceArgs, CallType)) 975 return ExprError(); 976 977 NumPlaceArgs = AllPlaceArgs.size(); 978 if (NumPlaceArgs > 0) 979 PlaceArgs = &AllPlaceArgs[0]; 980 } 981 982 bool Init = ConstructorLParen.isValid(); 983 // --- Choosing a constructor --- 984 CXXConstructorDecl *Constructor = 0; 985 Expr **ConsArgs = (Expr**)ConstructorArgs.get(); 986 unsigned NumConsArgs = ConstructorArgs.size(); 987 ASTOwningVector<Expr*> ConvertedConstructorArgs(*this); 988 989 // Array 'new' can't have any initializers. 990 if (NumConsArgs && (ResultType->isArrayType() || ArraySize)) { 991 SourceRange InitRange(ConsArgs[0]->getLocStart(), 992 ConsArgs[NumConsArgs - 1]->getLocEnd()); 993 994 Diag(StartLoc, diag::err_new_array_init_args) << InitRange; 995 return ExprError(); 996 } 997 998 if (!AllocType->isDependentType() && 999 !Expr::hasAnyTypeDependentArguments(ConsArgs, NumConsArgs)) { 1000 // C++0x [expr.new]p15: 1001 // A new-expression that creates an object of type T initializes that 1002 // object as follows: 1003 InitializationKind Kind 1004 // - If the new-initializer is omitted, the object is default- 1005 // initialized (8.5); if no initialization is performed, 1006 // the object has indeterminate value 1007 = !Init? InitializationKind::CreateDefault(TypeRange.getBegin()) 1008 // - Otherwise, the new-initializer is interpreted according to the 1009 // initialization rules of 8.5 for direct-initialization. 1010 : InitializationKind::CreateDirect(TypeRange.getBegin(), 1011 ConstructorLParen, 1012 ConstructorRParen); 1013 1014 InitializedEntity Entity 1015 = InitializedEntity::InitializeNew(StartLoc, AllocType); 1016 InitializationSequence InitSeq(*this, Entity, Kind, ConsArgs, NumConsArgs); 1017 ExprResult FullInit = InitSeq.Perform(*this, Entity, Kind, 1018 move(ConstructorArgs)); 1019 if (FullInit.isInvalid()) 1020 return ExprError(); 1021 1022 // FullInit is our initializer; walk through it to determine if it's a 1023 // constructor call, which CXXNewExpr handles directly. 1024 if (Expr *FullInitExpr = (Expr *)FullInit.get()) { 1025 if (CXXBindTemporaryExpr *Binder 1026 = dyn_cast<CXXBindTemporaryExpr>(FullInitExpr)) 1027 FullInitExpr = Binder->getSubExpr(); 1028 if (CXXConstructExpr *Construct 1029 = dyn_cast<CXXConstructExpr>(FullInitExpr)) { 1030 Constructor = Construct->getConstructor(); 1031 for (CXXConstructExpr::arg_iterator A = Construct->arg_begin(), 1032 AEnd = Construct->arg_end(); 1033 A != AEnd; ++A) 1034 ConvertedConstructorArgs.push_back(*A); 1035 } else { 1036 // Take the converted initializer. 1037 ConvertedConstructorArgs.push_back(FullInit.release()); 1038 } 1039 } else { 1040 // No initialization required. 1041 } 1042 1043 // Take the converted arguments and use them for the new expression. 1044 NumConsArgs = ConvertedConstructorArgs.size(); 1045 ConsArgs = (Expr **)ConvertedConstructorArgs.take(); 1046 } 1047 1048 // Mark the new and delete operators as referenced. 1049 if (OperatorNew) 1050 MarkDeclarationReferenced(StartLoc, OperatorNew); 1051 if (OperatorDelete) 1052 MarkDeclarationReferenced(StartLoc, OperatorDelete); 1053 1054 // FIXME: Also check that the destructor is accessible. (C++ 5.3.4p16) 1055 1056 PlacementArgs.release(); 1057 ConstructorArgs.release(); 1058 1059 return Owned(new (Context) CXXNewExpr(Context, UseGlobal, OperatorNew, 1060 PlaceArgs, NumPlaceArgs, TypeIdParens, 1061 ArraySize, Constructor, Init, 1062 ConsArgs, NumConsArgs, OperatorDelete, 1063 UsualArrayDeleteWantsSize, 1064 ResultType, AllocTypeInfo, 1065 StartLoc, 1066 Init ? ConstructorRParen : 1067 TypeRange.getEnd(), 1068 ConstructorLParen, ConstructorRParen)); 1069} 1070 1071/// CheckAllocatedType - Checks that a type is suitable as the allocated type 1072/// in a new-expression. 1073/// dimension off and stores the size expression in ArraySize. 1074bool Sema::CheckAllocatedType(QualType AllocType, SourceLocation Loc, 1075 SourceRange R) { 1076 // C++ 5.3.4p1: "[The] type shall be a complete object type, but not an 1077 // abstract class type or array thereof. 1078 if (AllocType->isFunctionType()) 1079 return Diag(Loc, diag::err_bad_new_type) 1080 << AllocType << 0 << R; 1081 else if (AllocType->isReferenceType()) 1082 return Diag(Loc, diag::err_bad_new_type) 1083 << AllocType << 1 << R; 1084 else if (!AllocType->isDependentType() && 1085 RequireCompleteType(Loc, AllocType, 1086 PDiag(diag::err_new_incomplete_type) 1087 << R)) 1088 return true; 1089 else if (RequireNonAbstractType(Loc, AllocType, 1090 diag::err_allocation_of_abstract_type)) 1091 return true; 1092 else if (AllocType->isVariablyModifiedType()) 1093 return Diag(Loc, diag::err_variably_modified_new_type) 1094 << AllocType; 1095 1096 return false; 1097} 1098 1099/// \brief Determine whether the given function is a non-placement 1100/// deallocation function. 1101static bool isNonPlacementDeallocationFunction(FunctionDecl *FD) { 1102 if (FD->isInvalidDecl()) 1103 return false; 1104 1105 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FD)) 1106 return Method->isUsualDeallocationFunction(); 1107 1108 return ((FD->getOverloadedOperator() == OO_Delete || 1109 FD->getOverloadedOperator() == OO_Array_Delete) && 1110 FD->getNumParams() == 1); 1111} 1112 1113/// FindAllocationFunctions - Finds the overloads of operator new and delete 1114/// that are appropriate for the allocation. 1115bool Sema::FindAllocationFunctions(SourceLocation StartLoc, SourceRange Range, 1116 bool UseGlobal, QualType AllocType, 1117 bool IsArray, Expr **PlaceArgs, 1118 unsigned NumPlaceArgs, 1119 FunctionDecl *&OperatorNew, 1120 FunctionDecl *&OperatorDelete) { 1121 // --- Choosing an allocation function --- 1122 // C++ 5.3.4p8 - 14 & 18 1123 // 1) If UseGlobal is true, only look in the global scope. Else, also look 1124 // in the scope of the allocated class. 1125 // 2) If an array size is given, look for operator new[], else look for 1126 // operator new. 1127 // 3) The first argument is always size_t. Append the arguments from the 1128 // placement form. 1129 1130 llvm::SmallVector<Expr*, 8> AllocArgs(1 + NumPlaceArgs); 1131 // We don't care about the actual value of this argument. 1132 // FIXME: Should the Sema create the expression and embed it in the syntax 1133 // tree? Or should the consumer just recalculate the value? 1134 IntegerLiteral Size(Context, llvm::APInt::getNullValue( 1135 Context.Target.getPointerWidth(0)), 1136 Context.getSizeType(), 1137 SourceLocation()); 1138 AllocArgs[0] = &Size; 1139 std::copy(PlaceArgs, PlaceArgs + NumPlaceArgs, AllocArgs.begin() + 1); 1140 1141 // C++ [expr.new]p8: 1142 // If the allocated type is a non-array type, the allocation 1143 // function's name is operator new and the deallocation function's 1144 // name is operator delete. If the allocated type is an array 1145 // type, the allocation function's name is operator new[] and the 1146 // deallocation function's name is operator delete[]. 1147 DeclarationName NewName = Context.DeclarationNames.getCXXOperatorName( 1148 IsArray ? OO_Array_New : OO_New); 1149 DeclarationName DeleteName = Context.DeclarationNames.getCXXOperatorName( 1150 IsArray ? OO_Array_Delete : OO_Delete); 1151 1152 QualType AllocElemType = Context.getBaseElementType(AllocType); 1153 1154 if (AllocElemType->isRecordType() && !UseGlobal) { 1155 CXXRecordDecl *Record 1156 = cast<CXXRecordDecl>(AllocElemType->getAs<RecordType>()->getDecl()); 1157 if (FindAllocationOverload(StartLoc, Range, NewName, &AllocArgs[0], 1158 AllocArgs.size(), Record, /*AllowMissing=*/true, 1159 OperatorNew)) 1160 return true; 1161 } 1162 if (!OperatorNew) { 1163 // Didn't find a member overload. Look for a global one. 1164 DeclareGlobalNewDelete(); 1165 DeclContext *TUDecl = Context.getTranslationUnitDecl(); 1166 if (FindAllocationOverload(StartLoc, Range, NewName, &AllocArgs[0], 1167 AllocArgs.size(), TUDecl, /*AllowMissing=*/false, 1168 OperatorNew)) 1169 return true; 1170 } 1171 1172 // We don't need an operator delete if we're running under 1173 // -fno-exceptions. 1174 if (!getLangOptions().Exceptions) { 1175 OperatorDelete = 0; 1176 return false; 1177 } 1178 1179 // FindAllocationOverload can change the passed in arguments, so we need to 1180 // copy them back. 1181 if (NumPlaceArgs > 0) 1182 std::copy(&AllocArgs[1], AllocArgs.end(), PlaceArgs); 1183 1184 // C++ [expr.new]p19: 1185 // 1186 // If the new-expression begins with a unary :: operator, the 1187 // deallocation function's name is looked up in the global 1188 // scope. Otherwise, if the allocated type is a class type T or an 1189 // array thereof, the deallocation function's name is looked up in 1190 // the scope of T. If this lookup fails to find the name, or if 1191 // the allocated type is not a class type or array thereof, the 1192 // deallocation function's name is looked up in the global scope. 1193 LookupResult FoundDelete(*this, DeleteName, StartLoc, LookupOrdinaryName); 1194 if (AllocElemType->isRecordType() && !UseGlobal) { 1195 CXXRecordDecl *RD 1196 = cast<CXXRecordDecl>(AllocElemType->getAs<RecordType>()->getDecl()); 1197 LookupQualifiedName(FoundDelete, RD); 1198 } 1199 if (FoundDelete.isAmbiguous()) 1200 return true; // FIXME: clean up expressions? 1201 1202 if (FoundDelete.empty()) { 1203 DeclareGlobalNewDelete(); 1204 LookupQualifiedName(FoundDelete, Context.getTranslationUnitDecl()); 1205 } 1206 1207 FoundDelete.suppressDiagnostics(); 1208 1209 llvm::SmallVector<std::pair<DeclAccessPair,FunctionDecl*>, 2> Matches; 1210 1211 // Whether we're looking for a placement operator delete is dictated 1212 // by whether we selected a placement operator new, not by whether 1213 // we had explicit placement arguments. This matters for things like 1214 // struct A { void *operator new(size_t, int = 0); ... }; 1215 // A *a = new A() 1216 bool isPlacementNew = (NumPlaceArgs > 0 || OperatorNew->param_size() != 1); 1217 1218 if (isPlacementNew) { 1219 // C++ [expr.new]p20: 1220 // A declaration of a placement deallocation function matches the 1221 // declaration of a placement allocation function if it has the 1222 // same number of parameters and, after parameter transformations 1223 // (8.3.5), all parameter types except the first are 1224 // identical. [...] 1225 // 1226 // To perform this comparison, we compute the function type that 1227 // the deallocation function should have, and use that type both 1228 // for template argument deduction and for comparison purposes. 1229 // 1230 // FIXME: this comparison should ignore CC and the like. 1231 QualType ExpectedFunctionType; 1232 { 1233 const FunctionProtoType *Proto 1234 = OperatorNew->getType()->getAs<FunctionProtoType>(); 1235 1236 llvm::SmallVector<QualType, 4> ArgTypes; 1237 ArgTypes.push_back(Context.VoidPtrTy); 1238 for (unsigned I = 1, N = Proto->getNumArgs(); I < N; ++I) 1239 ArgTypes.push_back(Proto->getArgType(I)); 1240 1241 FunctionProtoType::ExtProtoInfo EPI; 1242 EPI.Variadic = Proto->isVariadic(); 1243 1244 ExpectedFunctionType 1245 = Context.getFunctionType(Context.VoidTy, ArgTypes.data(), 1246 ArgTypes.size(), EPI); 1247 } 1248 1249 for (LookupResult::iterator D = FoundDelete.begin(), 1250 DEnd = FoundDelete.end(); 1251 D != DEnd; ++D) { 1252 FunctionDecl *Fn = 0; 1253 if (FunctionTemplateDecl *FnTmpl 1254 = dyn_cast<FunctionTemplateDecl>((*D)->getUnderlyingDecl())) { 1255 // Perform template argument deduction to try to match the 1256 // expected function type. 1257 TemplateDeductionInfo Info(Context, StartLoc); 1258 if (DeduceTemplateArguments(FnTmpl, 0, ExpectedFunctionType, Fn, Info)) 1259 continue; 1260 } else 1261 Fn = cast<FunctionDecl>((*D)->getUnderlyingDecl()); 1262 1263 if (Context.hasSameType(Fn->getType(), ExpectedFunctionType)) 1264 Matches.push_back(std::make_pair(D.getPair(), Fn)); 1265 } 1266 } else { 1267 // C++ [expr.new]p20: 1268 // [...] Any non-placement deallocation function matches a 1269 // non-placement allocation function. [...] 1270 for (LookupResult::iterator D = FoundDelete.begin(), 1271 DEnd = FoundDelete.end(); 1272 D != DEnd; ++D) { 1273 if (FunctionDecl *Fn = dyn_cast<FunctionDecl>((*D)->getUnderlyingDecl())) 1274 if (isNonPlacementDeallocationFunction(Fn)) 1275 Matches.push_back(std::make_pair(D.getPair(), Fn)); 1276 } 1277 } 1278 1279 // C++ [expr.new]p20: 1280 // [...] If the lookup finds a single matching deallocation 1281 // function, that function will be called; otherwise, no 1282 // deallocation function will be called. 1283 if (Matches.size() == 1) { 1284 OperatorDelete = Matches[0].second; 1285 1286 // C++0x [expr.new]p20: 1287 // If the lookup finds the two-parameter form of a usual 1288 // deallocation function (3.7.4.2) and that function, considered 1289 // as a placement deallocation function, would have been 1290 // selected as a match for the allocation function, the program 1291 // is ill-formed. 1292 if (NumPlaceArgs && getLangOptions().CPlusPlus0x && 1293 isNonPlacementDeallocationFunction(OperatorDelete)) { 1294 Diag(StartLoc, diag::err_placement_new_non_placement_delete) 1295 << SourceRange(PlaceArgs[0]->getLocStart(), 1296 PlaceArgs[NumPlaceArgs - 1]->getLocEnd()); 1297 Diag(OperatorDelete->getLocation(), diag::note_previous_decl) 1298 << DeleteName; 1299 } else { 1300 CheckAllocationAccess(StartLoc, Range, FoundDelete.getNamingClass(), 1301 Matches[0].first); 1302 } 1303 } 1304 1305 return false; 1306} 1307 1308/// FindAllocationOverload - Find an fitting overload for the allocation 1309/// function in the specified scope. 1310bool Sema::FindAllocationOverload(SourceLocation StartLoc, SourceRange Range, 1311 DeclarationName Name, Expr** Args, 1312 unsigned NumArgs, DeclContext *Ctx, 1313 bool AllowMissing, FunctionDecl *&Operator) { 1314 LookupResult R(*this, Name, StartLoc, LookupOrdinaryName); 1315 LookupQualifiedName(R, Ctx); 1316 if (R.empty()) { 1317 if (AllowMissing) 1318 return false; 1319 return Diag(StartLoc, diag::err_ovl_no_viable_function_in_call) 1320 << Name << Range; 1321 } 1322 1323 if (R.isAmbiguous()) 1324 return true; 1325 1326 R.suppressDiagnostics(); 1327 1328 OverloadCandidateSet Candidates(StartLoc); 1329 for (LookupResult::iterator Alloc = R.begin(), AllocEnd = R.end(); 1330 Alloc != AllocEnd; ++Alloc) { 1331 // Even member operator new/delete are implicitly treated as 1332 // static, so don't use AddMemberCandidate. 1333 NamedDecl *D = (*Alloc)->getUnderlyingDecl(); 1334 1335 if (FunctionTemplateDecl *FnTemplate = dyn_cast<FunctionTemplateDecl>(D)) { 1336 AddTemplateOverloadCandidate(FnTemplate, Alloc.getPair(), 1337 /*ExplicitTemplateArgs=*/0, Args, NumArgs, 1338 Candidates, 1339 /*SuppressUserConversions=*/false); 1340 continue; 1341 } 1342 1343 FunctionDecl *Fn = cast<FunctionDecl>(D); 1344 AddOverloadCandidate(Fn, Alloc.getPair(), Args, NumArgs, Candidates, 1345 /*SuppressUserConversions=*/false); 1346 } 1347 1348 // Do the resolution. 1349 OverloadCandidateSet::iterator Best; 1350 switch (Candidates.BestViableFunction(*this, StartLoc, Best)) { 1351 case OR_Success: { 1352 // Got one! 1353 FunctionDecl *FnDecl = Best->Function; 1354 MarkDeclarationReferenced(StartLoc, FnDecl); 1355 // The first argument is size_t, and the first parameter must be size_t, 1356 // too. This is checked on declaration and can be assumed. (It can't be 1357 // asserted on, though, since invalid decls are left in there.) 1358 // Watch out for variadic allocator function. 1359 unsigned NumArgsInFnDecl = FnDecl->getNumParams(); 1360 for (unsigned i = 0; (i < NumArgs && i < NumArgsInFnDecl); ++i) { 1361 ExprResult Result 1362 = PerformCopyInitialization(InitializedEntity::InitializeParameter( 1363 Context, 1364 FnDecl->getParamDecl(i)), 1365 SourceLocation(), 1366 Owned(Args[i])); 1367 if (Result.isInvalid()) 1368 return true; 1369 1370 Args[i] = Result.takeAs<Expr>(); 1371 } 1372 Operator = FnDecl; 1373 CheckAllocationAccess(StartLoc, Range, R.getNamingClass(), Best->FoundDecl); 1374 return false; 1375 } 1376 1377 case OR_No_Viable_Function: 1378 Diag(StartLoc, diag::err_ovl_no_viable_function_in_call) 1379 << Name << Range; 1380 Candidates.NoteCandidates(*this, OCD_AllCandidates, Args, NumArgs); 1381 return true; 1382 1383 case OR_Ambiguous: 1384 Diag(StartLoc, diag::err_ovl_ambiguous_call) 1385 << Name << Range; 1386 Candidates.NoteCandidates(*this, OCD_ViableCandidates, Args, NumArgs); 1387 return true; 1388 1389 case OR_Deleted: 1390 Diag(StartLoc, diag::err_ovl_deleted_call) 1391 << Best->Function->isDeleted() 1392 << Name 1393 << Best->Function->getMessageUnavailableAttr( 1394 !Best->Function->isDeleted()) 1395 << Range; 1396 Candidates.NoteCandidates(*this, OCD_AllCandidates, Args, NumArgs); 1397 return true; 1398 } 1399 assert(false && "Unreachable, bad result from BestViableFunction"); 1400 return true; 1401} 1402 1403 1404/// DeclareGlobalNewDelete - Declare the global forms of operator new and 1405/// delete. These are: 1406/// @code 1407/// void* operator new(std::size_t) throw(std::bad_alloc); 1408/// void* operator new[](std::size_t) throw(std::bad_alloc); 1409/// void operator delete(void *) throw(); 1410/// void operator delete[](void *) throw(); 1411/// @endcode 1412/// Note that the placement and nothrow forms of new are *not* implicitly 1413/// declared. Their use requires including \<new\>. 1414void Sema::DeclareGlobalNewDelete() { 1415 if (GlobalNewDeleteDeclared) 1416 return; 1417 1418 // C++ [basic.std.dynamic]p2: 1419 // [...] The following allocation and deallocation functions (18.4) are 1420 // implicitly declared in global scope in each translation unit of a 1421 // program 1422 // 1423 // void* operator new(std::size_t) throw(std::bad_alloc); 1424 // void* operator new[](std::size_t) throw(std::bad_alloc); 1425 // void operator delete(void*) throw(); 1426 // void operator delete[](void*) throw(); 1427 // 1428 // These implicit declarations introduce only the function names operator 1429 // new, operator new[], operator delete, operator delete[]. 1430 // 1431 // Here, we need to refer to std::bad_alloc, so we will implicitly declare 1432 // "std" or "bad_alloc" as necessary to form the exception specification. 1433 // However, we do not make these implicit declarations visible to name 1434 // lookup. 1435 if (!StdBadAlloc) { 1436 // The "std::bad_alloc" class has not yet been declared, so build it 1437 // implicitly. 1438 StdBadAlloc = CXXRecordDecl::Create(Context, TTK_Class, 1439 getOrCreateStdNamespace(), 1440 SourceLocation(), SourceLocation(), 1441 &PP.getIdentifierTable().get("bad_alloc"), 1442 0); 1443 getStdBadAlloc()->setImplicit(true); 1444 } 1445 1446 GlobalNewDeleteDeclared = true; 1447 1448 QualType VoidPtr = Context.getPointerType(Context.VoidTy); 1449 QualType SizeT = Context.getSizeType(); 1450 bool AssumeSaneOperatorNew = getLangOptions().AssumeSaneOperatorNew; 1451 1452 DeclareGlobalAllocationFunction( 1453 Context.DeclarationNames.getCXXOperatorName(OO_New), 1454 VoidPtr, SizeT, AssumeSaneOperatorNew); 1455 DeclareGlobalAllocationFunction( 1456 Context.DeclarationNames.getCXXOperatorName(OO_Array_New), 1457 VoidPtr, SizeT, AssumeSaneOperatorNew); 1458 DeclareGlobalAllocationFunction( 1459 Context.DeclarationNames.getCXXOperatorName(OO_Delete), 1460 Context.VoidTy, VoidPtr); 1461 DeclareGlobalAllocationFunction( 1462 Context.DeclarationNames.getCXXOperatorName(OO_Array_Delete), 1463 Context.VoidTy, VoidPtr); 1464} 1465 1466/// DeclareGlobalAllocationFunction - Declares a single implicit global 1467/// allocation function if it doesn't already exist. 1468void Sema::DeclareGlobalAllocationFunction(DeclarationName Name, 1469 QualType Return, QualType Argument, 1470 bool AddMallocAttr) { 1471 DeclContext *GlobalCtx = Context.getTranslationUnitDecl(); 1472 1473 // Check if this function is already declared. 1474 { 1475 DeclContext::lookup_iterator Alloc, AllocEnd; 1476 for (llvm::tie(Alloc, AllocEnd) = GlobalCtx->lookup(Name); 1477 Alloc != AllocEnd; ++Alloc) { 1478 // Only look at non-template functions, as it is the predefined, 1479 // non-templated allocation function we are trying to declare here. 1480 if (FunctionDecl *Func = dyn_cast<FunctionDecl>(*Alloc)) { 1481 QualType InitialParamType = 1482 Context.getCanonicalType( 1483 Func->getParamDecl(0)->getType().getUnqualifiedType()); 1484 // FIXME: Do we need to check for default arguments here? 1485 if (Func->getNumParams() == 1 && InitialParamType == Argument) { 1486 if(AddMallocAttr && !Func->hasAttr<MallocAttr>()) 1487 Func->addAttr(::new (Context) MallocAttr(SourceLocation(), Context)); 1488 return; 1489 } 1490 } 1491 } 1492 } 1493 1494 QualType BadAllocType; 1495 bool HasBadAllocExceptionSpec 1496 = (Name.getCXXOverloadedOperator() == OO_New || 1497 Name.getCXXOverloadedOperator() == OO_Array_New); 1498 if (HasBadAllocExceptionSpec) { 1499 assert(StdBadAlloc && "Must have std::bad_alloc declared"); 1500 BadAllocType = Context.getTypeDeclType(getStdBadAlloc()); 1501 } 1502 1503 FunctionProtoType::ExtProtoInfo EPI; 1504 if (HasBadAllocExceptionSpec) { 1505 EPI.ExceptionSpecType = EST_Dynamic; 1506 EPI.NumExceptions = 1; 1507 EPI.Exceptions = &BadAllocType; 1508 } else { 1509 EPI.ExceptionSpecType = EST_DynamicNone; 1510 } 1511 1512 QualType FnType = Context.getFunctionType(Return, &Argument, 1, EPI); 1513 FunctionDecl *Alloc = 1514 FunctionDecl::Create(Context, GlobalCtx, SourceLocation(), 1515 SourceLocation(), Name, 1516 FnType, /*TInfo=*/0, SC_None, 1517 SC_None, false, true); 1518 Alloc->setImplicit(); 1519 1520 if (AddMallocAttr) 1521 Alloc->addAttr(::new (Context) MallocAttr(SourceLocation(), Context)); 1522 1523 ParmVarDecl *Param = ParmVarDecl::Create(Context, Alloc, SourceLocation(), 1524 SourceLocation(), 0, 1525 Argument, /*TInfo=*/0, 1526 SC_None, SC_None, 0); 1527 Alloc->setParams(&Param, 1); 1528 1529 // FIXME: Also add this declaration to the IdentifierResolver, but 1530 // make sure it is at the end of the chain to coincide with the 1531 // global scope. 1532 Context.getTranslationUnitDecl()->addDecl(Alloc); 1533} 1534 1535bool Sema::FindDeallocationFunction(SourceLocation StartLoc, CXXRecordDecl *RD, 1536 DeclarationName Name, 1537 FunctionDecl* &Operator) { 1538 LookupResult Found(*this, Name, StartLoc, LookupOrdinaryName); 1539 // Try to find operator delete/operator delete[] in class scope. 1540 LookupQualifiedName(Found, RD); 1541 1542 if (Found.isAmbiguous()) 1543 return true; 1544 1545 Found.suppressDiagnostics(); 1546 1547 llvm::SmallVector<DeclAccessPair,4> Matches; 1548 for (LookupResult::iterator F = Found.begin(), FEnd = Found.end(); 1549 F != FEnd; ++F) { 1550 NamedDecl *ND = (*F)->getUnderlyingDecl(); 1551 1552 // Ignore template operator delete members from the check for a usual 1553 // deallocation function. 1554 if (isa<FunctionTemplateDecl>(ND)) 1555 continue; 1556 1557 if (cast<CXXMethodDecl>(ND)->isUsualDeallocationFunction()) 1558 Matches.push_back(F.getPair()); 1559 } 1560 1561 // There's exactly one suitable operator; pick it. 1562 if (Matches.size() == 1) { 1563 Operator = cast<CXXMethodDecl>(Matches[0]->getUnderlyingDecl()); 1564 CheckAllocationAccess(StartLoc, SourceRange(), Found.getNamingClass(), 1565 Matches[0]); 1566 return false; 1567 1568 // We found multiple suitable operators; complain about the ambiguity. 1569 } else if (!Matches.empty()) { 1570 Diag(StartLoc, diag::err_ambiguous_suitable_delete_member_function_found) 1571 << Name << RD; 1572 1573 for (llvm::SmallVectorImpl<DeclAccessPair>::iterator 1574 F = Matches.begin(), FEnd = Matches.end(); F != FEnd; ++F) 1575 Diag((*F)->getUnderlyingDecl()->getLocation(), 1576 diag::note_member_declared_here) << Name; 1577 return true; 1578 } 1579 1580 // We did find operator delete/operator delete[] declarations, but 1581 // none of them were suitable. 1582 if (!Found.empty()) { 1583 Diag(StartLoc, diag::err_no_suitable_delete_member_function_found) 1584 << Name << RD; 1585 1586 for (LookupResult::iterator F = Found.begin(), FEnd = Found.end(); 1587 F != FEnd; ++F) 1588 Diag((*F)->getUnderlyingDecl()->getLocation(), 1589 diag::note_member_declared_here) << Name; 1590 1591 return true; 1592 } 1593 1594 // Look for a global declaration. 1595 DeclareGlobalNewDelete(); 1596 DeclContext *TUDecl = Context.getTranslationUnitDecl(); 1597 1598 CXXNullPtrLiteralExpr Null(Context.VoidPtrTy, SourceLocation()); 1599 Expr* DeallocArgs[1]; 1600 DeallocArgs[0] = &Null; 1601 if (FindAllocationOverload(StartLoc, SourceRange(), Name, 1602 DeallocArgs, 1, TUDecl, /*AllowMissing=*/false, 1603 Operator)) 1604 return true; 1605 1606 assert(Operator && "Did not find a deallocation function!"); 1607 return false; 1608} 1609 1610/// ActOnCXXDelete - Parsed a C++ 'delete' expression (C++ 5.3.5), as in: 1611/// @code ::delete ptr; @endcode 1612/// or 1613/// @code delete [] ptr; @endcode 1614ExprResult 1615Sema::ActOnCXXDelete(SourceLocation StartLoc, bool UseGlobal, 1616 bool ArrayForm, Expr *Ex) { 1617 // C++ [expr.delete]p1: 1618 // The operand shall have a pointer type, or a class type having a single 1619 // conversion function to a pointer type. The result has type void. 1620 // 1621 // DR599 amends "pointer type" to "pointer to object type" in both cases. 1622 1623 FunctionDecl *OperatorDelete = 0; 1624 bool ArrayFormAsWritten = ArrayForm; 1625 bool UsualArrayDeleteWantsSize = false; 1626 1627 if (!Ex->isTypeDependent()) { 1628 QualType Type = Ex->getType(); 1629 1630 if (const RecordType *Record = Type->getAs<RecordType>()) { 1631 if (RequireCompleteType(StartLoc, Type, 1632 PDiag(diag::err_delete_incomplete_class_type))) 1633 return ExprError(); 1634 1635 llvm::SmallVector<CXXConversionDecl*, 4> ObjectPtrConversions; 1636 1637 CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl()); 1638 const UnresolvedSetImpl *Conversions = RD->getVisibleConversionFunctions(); 1639 for (UnresolvedSetImpl::iterator I = Conversions->begin(), 1640 E = Conversions->end(); I != E; ++I) { 1641 NamedDecl *D = I.getDecl(); 1642 if (isa<UsingShadowDecl>(D)) 1643 D = cast<UsingShadowDecl>(D)->getTargetDecl(); 1644 1645 // Skip over templated conversion functions; they aren't considered. 1646 if (isa<FunctionTemplateDecl>(D)) 1647 continue; 1648 1649 CXXConversionDecl *Conv = cast<CXXConversionDecl>(D); 1650 1651 QualType ConvType = Conv->getConversionType().getNonReferenceType(); 1652 if (const PointerType *ConvPtrType = ConvType->getAs<PointerType>()) 1653 if (ConvPtrType->getPointeeType()->isIncompleteOrObjectType()) 1654 ObjectPtrConversions.push_back(Conv); 1655 } 1656 if (ObjectPtrConversions.size() == 1) { 1657 // We have a single conversion to a pointer-to-object type. Perform 1658 // that conversion. 1659 // TODO: don't redo the conversion calculation. 1660 if (!PerformImplicitConversion(Ex, 1661 ObjectPtrConversions.front()->getConversionType(), 1662 AA_Converting)) { 1663 Type = Ex->getType(); 1664 } 1665 } 1666 else if (ObjectPtrConversions.size() > 1) { 1667 Diag(StartLoc, diag::err_ambiguous_delete_operand) 1668 << Type << Ex->getSourceRange(); 1669 for (unsigned i= 0; i < ObjectPtrConversions.size(); i++) 1670 NoteOverloadCandidate(ObjectPtrConversions[i]); 1671 return ExprError(); 1672 } 1673 } 1674 1675 if (!Type->isPointerType()) 1676 return ExprError(Diag(StartLoc, diag::err_delete_operand) 1677 << Type << Ex->getSourceRange()); 1678 1679 QualType Pointee = Type->getAs<PointerType>()->getPointeeType(); 1680 if (Pointee->isVoidType() && !isSFINAEContext()) { 1681 // The C++ standard bans deleting a pointer to a non-object type, which 1682 // effectively bans deletion of "void*". However, most compilers support 1683 // this, so we treat it as a warning unless we're in a SFINAE context. 1684 Diag(StartLoc, diag::ext_delete_void_ptr_operand) 1685 << Type << Ex->getSourceRange(); 1686 } else if (Pointee->isFunctionType() || Pointee->isVoidType()) 1687 return ExprError(Diag(StartLoc, diag::err_delete_operand) 1688 << Type << Ex->getSourceRange()); 1689 else if (!Pointee->isDependentType() && 1690 RequireCompleteType(StartLoc, Pointee, 1691 PDiag(diag::warn_delete_incomplete) 1692 << Ex->getSourceRange())) 1693 return ExprError(); 1694 1695 // C++ [expr.delete]p2: 1696 // [Note: a pointer to a const type can be the operand of a 1697 // delete-expression; it is not necessary to cast away the constness 1698 // (5.2.11) of the pointer expression before it is used as the operand 1699 // of the delete-expression. ] 1700 ImpCastExprToType(Ex, Context.getPointerType(Context.VoidTy), 1701 CK_NoOp); 1702 1703 if (Pointee->isArrayType() && !ArrayForm) { 1704 Diag(StartLoc, diag::warn_delete_array_type) 1705 << Type << Ex->getSourceRange() 1706 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(StartLoc), "[]"); 1707 ArrayForm = true; 1708 } 1709 1710 DeclarationName DeleteName = Context.DeclarationNames.getCXXOperatorName( 1711 ArrayForm ? OO_Array_Delete : OO_Delete); 1712 1713 QualType PointeeElem = Context.getBaseElementType(Pointee); 1714 if (const RecordType *RT = PointeeElem->getAs<RecordType>()) { 1715 CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 1716 1717 if (!UseGlobal && 1718 FindDeallocationFunction(StartLoc, RD, DeleteName, OperatorDelete)) 1719 return ExprError(); 1720 1721 // If we're allocating an array of records, check whether the 1722 // usual operator delete[] has a size_t parameter. 1723 if (ArrayForm) { 1724 // If the user specifically asked to use the global allocator, 1725 // we'll need to do the lookup into the class. 1726 if (UseGlobal) 1727 UsualArrayDeleteWantsSize = 1728 doesUsualArrayDeleteWantSize(*this, StartLoc, PointeeElem); 1729 1730 // Otherwise, the usual operator delete[] should be the 1731 // function we just found. 1732 else if (isa<CXXMethodDecl>(OperatorDelete)) 1733 UsualArrayDeleteWantsSize = (OperatorDelete->getNumParams() == 2); 1734 } 1735 1736 if (!RD->hasTrivialDestructor()) 1737 if (CXXDestructorDecl *Dtor = LookupDestructor(RD)) { 1738 MarkDeclarationReferenced(StartLoc, 1739 const_cast<CXXDestructorDecl*>(Dtor)); 1740 DiagnoseUseOfDecl(Dtor, StartLoc); 1741 } 1742 } 1743 1744 if (!OperatorDelete) { 1745 // Look for a global declaration. 1746 DeclareGlobalNewDelete(); 1747 DeclContext *TUDecl = Context.getTranslationUnitDecl(); 1748 if (FindAllocationOverload(StartLoc, SourceRange(), DeleteName, 1749 &Ex, 1, TUDecl, /*AllowMissing=*/false, 1750 OperatorDelete)) 1751 return ExprError(); 1752 } 1753 1754 MarkDeclarationReferenced(StartLoc, OperatorDelete); 1755 1756 // Check access and ambiguity of operator delete and destructor. 1757 if (const RecordType *RT = PointeeElem->getAs<RecordType>()) { 1758 CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 1759 if (CXXDestructorDecl *Dtor = LookupDestructor(RD)) { 1760 CheckDestructorAccess(Ex->getExprLoc(), Dtor, 1761 PDiag(diag::err_access_dtor) << PointeeElem); 1762 } 1763 } 1764 1765 } 1766 1767 return Owned(new (Context) CXXDeleteExpr(Context.VoidTy, UseGlobal, ArrayForm, 1768 ArrayFormAsWritten, 1769 UsualArrayDeleteWantsSize, 1770 OperatorDelete, Ex, StartLoc)); 1771} 1772 1773/// \brief Check the use of the given variable as a C++ condition in an if, 1774/// while, do-while, or switch statement. 1775ExprResult Sema::CheckConditionVariable(VarDecl *ConditionVar, 1776 SourceLocation StmtLoc, 1777 bool ConvertToBoolean) { 1778 QualType T = ConditionVar->getType(); 1779 1780 // C++ [stmt.select]p2: 1781 // The declarator shall not specify a function or an array. 1782 if (T->isFunctionType()) 1783 return ExprError(Diag(ConditionVar->getLocation(), 1784 diag::err_invalid_use_of_function_type) 1785 << ConditionVar->getSourceRange()); 1786 else if (T->isArrayType()) 1787 return ExprError(Diag(ConditionVar->getLocation(), 1788 diag::err_invalid_use_of_array_type) 1789 << ConditionVar->getSourceRange()); 1790 1791 Expr *Condition = DeclRefExpr::Create(Context, NestedNameSpecifierLoc(), 1792 ConditionVar, 1793 ConditionVar->getLocation(), 1794 ConditionVar->getType().getNonReferenceType(), 1795 VK_LValue); 1796 if (ConvertToBoolean && CheckBooleanCondition(Condition, StmtLoc)) 1797 return ExprError(); 1798 1799 return Owned(Condition); 1800} 1801 1802/// CheckCXXBooleanCondition - Returns true if a conversion to bool is invalid. 1803bool Sema::CheckCXXBooleanCondition(Expr *&CondExpr) { 1804 // C++ 6.4p4: 1805 // The value of a condition that is an initialized declaration in a statement 1806 // other than a switch statement is the value of the declared variable 1807 // implicitly converted to type bool. If that conversion is ill-formed, the 1808 // program is ill-formed. 1809 // The value of a condition that is an expression is the value of the 1810 // expression, implicitly converted to bool. 1811 // 1812 return PerformContextuallyConvertToBool(CondExpr); 1813} 1814 1815/// Helper function to determine whether this is the (deprecated) C++ 1816/// conversion from a string literal to a pointer to non-const char or 1817/// non-const wchar_t (for narrow and wide string literals, 1818/// respectively). 1819bool 1820Sema::IsStringLiteralToNonConstPointerConversion(Expr *From, QualType ToType) { 1821 // Look inside the implicit cast, if it exists. 1822 if (ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(From)) 1823 From = Cast->getSubExpr(); 1824 1825 // A string literal (2.13.4) that is not a wide string literal can 1826 // be converted to an rvalue of type "pointer to char"; a wide 1827 // string literal can be converted to an rvalue of type "pointer 1828 // to wchar_t" (C++ 4.2p2). 1829 if (StringLiteral *StrLit = dyn_cast<StringLiteral>(From->IgnoreParens())) 1830 if (const PointerType *ToPtrType = ToType->getAs<PointerType>()) 1831 if (const BuiltinType *ToPointeeType 1832 = ToPtrType->getPointeeType()->getAs<BuiltinType>()) { 1833 // This conversion is considered only when there is an 1834 // explicit appropriate pointer target type (C++ 4.2p2). 1835 if (!ToPtrType->getPointeeType().hasQualifiers() && 1836 ((StrLit->isWide() && ToPointeeType->isWideCharType()) || 1837 (!StrLit->isWide() && 1838 (ToPointeeType->getKind() == BuiltinType::Char_U || 1839 ToPointeeType->getKind() == BuiltinType::Char_S)))) 1840 return true; 1841 } 1842 1843 return false; 1844} 1845 1846static ExprResult BuildCXXCastArgument(Sema &S, 1847 SourceLocation CastLoc, 1848 QualType Ty, 1849 CastKind Kind, 1850 CXXMethodDecl *Method, 1851 NamedDecl *FoundDecl, 1852 Expr *From) { 1853 switch (Kind) { 1854 default: assert(0 && "Unhandled cast kind!"); 1855 case CK_ConstructorConversion: { 1856 ASTOwningVector<Expr*> ConstructorArgs(S); 1857 1858 if (S.CompleteConstructorCall(cast<CXXConstructorDecl>(Method), 1859 MultiExprArg(&From, 1), 1860 CastLoc, ConstructorArgs)) 1861 return ExprError(); 1862 1863 ExprResult Result = 1864 S.BuildCXXConstructExpr(CastLoc, Ty, cast<CXXConstructorDecl>(Method), 1865 move_arg(ConstructorArgs), 1866 /*ZeroInit*/ false, CXXConstructExpr::CK_Complete, 1867 SourceRange()); 1868 if (Result.isInvalid()) 1869 return ExprError(); 1870 1871 return S.MaybeBindToTemporary(Result.takeAs<Expr>()); 1872 } 1873 1874 case CK_UserDefinedConversion: { 1875 assert(!From->getType()->isPointerType() && "Arg can't have pointer type!"); 1876 1877 // Create an implicit call expr that calls it. 1878 ExprResult Result = S.BuildCXXMemberCallExpr(From, FoundDecl, Method); 1879 if (Result.isInvalid()) 1880 return ExprError(); 1881 1882 return S.MaybeBindToTemporary(Result.get()); 1883 } 1884 } 1885} 1886 1887/// PerformImplicitConversion - Perform an implicit conversion of the 1888/// expression From to the type ToType using the pre-computed implicit 1889/// conversion sequence ICS. Returns true if there was an error, false 1890/// otherwise. The expression From is replaced with the converted 1891/// expression. Action is the kind of conversion we're performing, 1892/// used in the error message. 1893bool 1894Sema::PerformImplicitConversion(Expr *&From, QualType ToType, 1895 const ImplicitConversionSequence &ICS, 1896 AssignmentAction Action, bool CStyle) { 1897 switch (ICS.getKind()) { 1898 case ImplicitConversionSequence::StandardConversion: 1899 if (PerformImplicitConversion(From, ToType, ICS.Standard, Action, 1900 CStyle)) 1901 return true; 1902 break; 1903 1904 case ImplicitConversionSequence::UserDefinedConversion: { 1905 1906 FunctionDecl *FD = ICS.UserDefined.ConversionFunction; 1907 CastKind CastKind; 1908 QualType BeforeToType; 1909 if (const CXXConversionDecl *Conv = dyn_cast<CXXConversionDecl>(FD)) { 1910 CastKind = CK_UserDefinedConversion; 1911 1912 // If the user-defined conversion is specified by a conversion function, 1913 // the initial standard conversion sequence converts the source type to 1914 // the implicit object parameter of the conversion function. 1915 BeforeToType = Context.getTagDeclType(Conv->getParent()); 1916 } else { 1917 const CXXConstructorDecl *Ctor = cast<CXXConstructorDecl>(FD); 1918 CastKind = CK_ConstructorConversion; 1919 // Do no conversion if dealing with ... for the first conversion. 1920 if (!ICS.UserDefined.EllipsisConversion) { 1921 // If the user-defined conversion is specified by a constructor, the 1922 // initial standard conversion sequence converts the source type to the 1923 // type required by the argument of the constructor 1924 BeforeToType = Ctor->getParamDecl(0)->getType().getNonReferenceType(); 1925 } 1926 } 1927 // Watch out for elipsis conversion. 1928 if (!ICS.UserDefined.EllipsisConversion) { 1929 if (PerformImplicitConversion(From, BeforeToType, 1930 ICS.UserDefined.Before, AA_Converting, 1931 CStyle)) 1932 return true; 1933 } 1934 1935 ExprResult CastArg 1936 = BuildCXXCastArgument(*this, 1937 From->getLocStart(), 1938 ToType.getNonReferenceType(), 1939 CastKind, cast<CXXMethodDecl>(FD), 1940 ICS.UserDefined.FoundConversionFunction, 1941 From); 1942 1943 if (CastArg.isInvalid()) 1944 return true; 1945 1946 From = CastArg.takeAs<Expr>(); 1947 1948 return PerformImplicitConversion(From, ToType, ICS.UserDefined.After, 1949 AA_Converting, CStyle); 1950 } 1951 1952 case ImplicitConversionSequence::AmbiguousConversion: 1953 ICS.DiagnoseAmbiguousConversion(*this, From->getExprLoc(), 1954 PDiag(diag::err_typecheck_ambiguous_condition) 1955 << From->getSourceRange()); 1956 return true; 1957 1958 case ImplicitConversionSequence::EllipsisConversion: 1959 assert(false && "Cannot perform an ellipsis conversion"); 1960 return false; 1961 1962 case ImplicitConversionSequence::BadConversion: 1963 return true; 1964 } 1965 1966 // Everything went well. 1967 return false; 1968} 1969 1970/// PerformImplicitConversion - Perform an implicit conversion of the 1971/// expression From to the type ToType by following the standard 1972/// conversion sequence SCS. Returns true if there was an error, false 1973/// otherwise. The expression From is replaced with the converted 1974/// expression. Flavor is the context in which we're performing this 1975/// conversion, for use in error messages. 1976bool 1977Sema::PerformImplicitConversion(Expr *&From, QualType ToType, 1978 const StandardConversionSequence& SCS, 1979 AssignmentAction Action, bool CStyle) { 1980 // Overall FIXME: we are recomputing too many types here and doing far too 1981 // much extra work. What this means is that we need to keep track of more 1982 // information that is computed when we try the implicit conversion initially, 1983 // so that we don't need to recompute anything here. 1984 QualType FromType = From->getType(); 1985 1986 if (SCS.CopyConstructor) { 1987 // FIXME: When can ToType be a reference type? 1988 assert(!ToType->isReferenceType()); 1989 if (SCS.Second == ICK_Derived_To_Base) { 1990 ASTOwningVector<Expr*> ConstructorArgs(*this); 1991 if (CompleteConstructorCall(cast<CXXConstructorDecl>(SCS.CopyConstructor), 1992 MultiExprArg(*this, &From, 1), 1993 /*FIXME:ConstructLoc*/SourceLocation(), 1994 ConstructorArgs)) 1995 return true; 1996 ExprResult FromResult = 1997 BuildCXXConstructExpr(/*FIXME:ConstructLoc*/SourceLocation(), 1998 ToType, SCS.CopyConstructor, 1999 move_arg(ConstructorArgs), 2000 /*ZeroInit*/ false, 2001 CXXConstructExpr::CK_Complete, 2002 SourceRange()); 2003 if (FromResult.isInvalid()) 2004 return true; 2005 From = FromResult.takeAs<Expr>(); 2006 return false; 2007 } 2008 ExprResult FromResult = 2009 BuildCXXConstructExpr(/*FIXME:ConstructLoc*/SourceLocation(), 2010 ToType, SCS.CopyConstructor, 2011 MultiExprArg(*this, &From, 1), 2012 /*ZeroInit*/ false, 2013 CXXConstructExpr::CK_Complete, 2014 SourceRange()); 2015 2016 if (FromResult.isInvalid()) 2017 return true; 2018 2019 From = FromResult.takeAs<Expr>(); 2020 return false; 2021 } 2022 2023 // Resolve overloaded function references. 2024 if (Context.hasSameType(FromType, Context.OverloadTy)) { 2025 DeclAccessPair Found; 2026 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(From, ToType, 2027 true, Found); 2028 if (!Fn) 2029 return true; 2030 2031 if (DiagnoseUseOfDecl(Fn, From->getSourceRange().getBegin())) 2032 return true; 2033 2034 From = FixOverloadedFunctionReference(From, Found, Fn); 2035 FromType = From->getType(); 2036 } 2037 2038 // Perform the first implicit conversion. 2039 switch (SCS.First) { 2040 case ICK_Identity: 2041 // Nothing to do. 2042 break; 2043 2044 case ICK_Lvalue_To_Rvalue: 2045 // Should this get its own ICK? 2046 if (From->getObjectKind() == OK_ObjCProperty) { 2047 ConvertPropertyForRValue(From); 2048 if (!From->isGLValue()) break; 2049 } 2050 2051 // Check for trivial buffer overflows. 2052 CheckArrayAccess(From); 2053 2054 FromType = FromType.getUnqualifiedType(); 2055 From = ImplicitCastExpr::Create(Context, FromType, CK_LValueToRValue, 2056 From, 0, VK_RValue); 2057 break; 2058 2059 case ICK_Array_To_Pointer: 2060 FromType = Context.getArrayDecayedType(FromType); 2061 ImpCastExprToType(From, FromType, CK_ArrayToPointerDecay); 2062 break; 2063 2064 case ICK_Function_To_Pointer: 2065 FromType = Context.getPointerType(FromType); 2066 ImpCastExprToType(From, FromType, CK_FunctionToPointerDecay); 2067 break; 2068 2069 default: 2070 assert(false && "Improper first standard conversion"); 2071 break; 2072 } 2073 2074 // Perform the second implicit conversion 2075 switch (SCS.Second) { 2076 case ICK_Identity: 2077 // If both sides are functions (or pointers/references to them), there could 2078 // be incompatible exception declarations. 2079 if (CheckExceptionSpecCompatibility(From, ToType)) 2080 return true; 2081 // Nothing else to do. 2082 break; 2083 2084 case ICK_NoReturn_Adjustment: 2085 // If both sides are functions (or pointers/references to them), there could 2086 // be incompatible exception declarations. 2087 if (CheckExceptionSpecCompatibility(From, ToType)) 2088 return true; 2089 2090 ImpCastExprToType(From, ToType, CK_NoOp); 2091 break; 2092 2093 case ICK_Integral_Promotion: 2094 case ICK_Integral_Conversion: 2095 ImpCastExprToType(From, ToType, CK_IntegralCast); 2096 break; 2097 2098 case ICK_Floating_Promotion: 2099 case ICK_Floating_Conversion: 2100 ImpCastExprToType(From, ToType, CK_FloatingCast); 2101 break; 2102 2103 case ICK_Complex_Promotion: 2104 case ICK_Complex_Conversion: { 2105 QualType FromEl = From->getType()->getAs<ComplexType>()->getElementType(); 2106 QualType ToEl = ToType->getAs<ComplexType>()->getElementType(); 2107 CastKind CK; 2108 if (FromEl->isRealFloatingType()) { 2109 if (ToEl->isRealFloatingType()) 2110 CK = CK_FloatingComplexCast; 2111 else 2112 CK = CK_FloatingComplexToIntegralComplex; 2113 } else if (ToEl->isRealFloatingType()) { 2114 CK = CK_IntegralComplexToFloatingComplex; 2115 } else { 2116 CK = CK_IntegralComplexCast; 2117 } 2118 ImpCastExprToType(From, ToType, CK); 2119 break; 2120 } 2121 2122 case ICK_Floating_Integral: 2123 if (ToType->isRealFloatingType()) 2124 ImpCastExprToType(From, ToType, CK_IntegralToFloating); 2125 else 2126 ImpCastExprToType(From, ToType, CK_FloatingToIntegral); 2127 break; 2128 2129 case ICK_Compatible_Conversion: 2130 ImpCastExprToType(From, ToType, CK_NoOp); 2131 break; 2132 2133 case ICK_Pointer_Conversion: { 2134 if (SCS.IncompatibleObjC && Action != AA_Casting) { 2135 // Diagnose incompatible Objective-C conversions 2136 Diag(From->getSourceRange().getBegin(), 2137 diag::ext_typecheck_convert_incompatible_pointer) 2138 << From->getType() << ToType << Action 2139 << From->getSourceRange(); 2140 } 2141 2142 CastKind Kind = CK_Invalid; 2143 CXXCastPath BasePath; 2144 if (CheckPointerConversion(From, ToType, Kind, BasePath, CStyle)) 2145 return true; 2146 ImpCastExprToType(From, ToType, Kind, VK_RValue, &BasePath); 2147 break; 2148 } 2149 2150 case ICK_Pointer_Member: { 2151 CastKind Kind = CK_Invalid; 2152 CXXCastPath BasePath; 2153 if (CheckMemberPointerConversion(From, ToType, Kind, BasePath, CStyle)) 2154 return true; 2155 if (CheckExceptionSpecCompatibility(From, ToType)) 2156 return true; 2157 ImpCastExprToType(From, ToType, Kind, VK_RValue, &BasePath); 2158 break; 2159 } 2160 case ICK_Boolean_Conversion: { 2161 CastKind Kind = CK_Invalid; 2162 switch (FromType->getScalarTypeKind()) { 2163 case Type::STK_Pointer: Kind = CK_PointerToBoolean; break; 2164 case Type::STK_MemberPointer: Kind = CK_MemberPointerToBoolean; break; 2165 case Type::STK_Bool: llvm_unreachable("bool -> bool conversion?"); 2166 case Type::STK_Integral: Kind = CK_IntegralToBoolean; break; 2167 case Type::STK_Floating: Kind = CK_FloatingToBoolean; break; 2168 case Type::STK_IntegralComplex: Kind = CK_IntegralComplexToBoolean; break; 2169 case Type::STK_FloatingComplex: Kind = CK_FloatingComplexToBoolean; break; 2170 } 2171 2172 ImpCastExprToType(From, Context.BoolTy, Kind); 2173 break; 2174 } 2175 2176 case ICK_Derived_To_Base: { 2177 CXXCastPath BasePath; 2178 if (CheckDerivedToBaseConversion(From->getType(), 2179 ToType.getNonReferenceType(), 2180 From->getLocStart(), 2181 From->getSourceRange(), 2182 &BasePath, 2183 CStyle)) 2184 return true; 2185 2186 ImpCastExprToType(From, ToType.getNonReferenceType(), 2187 CK_DerivedToBase, CastCategory(From), 2188 &BasePath); 2189 break; 2190 } 2191 2192 case ICK_Vector_Conversion: 2193 ImpCastExprToType(From, ToType, CK_BitCast); 2194 break; 2195 2196 case ICK_Vector_Splat: 2197 ImpCastExprToType(From, ToType, CK_VectorSplat); 2198 break; 2199 2200 case ICK_Complex_Real: 2201 // Case 1. x -> _Complex y 2202 if (const ComplexType *ToComplex = ToType->getAs<ComplexType>()) { 2203 QualType ElType = ToComplex->getElementType(); 2204 bool isFloatingComplex = ElType->isRealFloatingType(); 2205 2206 // x -> y 2207 if (Context.hasSameUnqualifiedType(ElType, From->getType())) { 2208 // do nothing 2209 } else if (From->getType()->isRealFloatingType()) { 2210 ImpCastExprToType(From, ElType, 2211 isFloatingComplex ? CK_FloatingCast : CK_FloatingToIntegral); 2212 } else { 2213 assert(From->getType()->isIntegerType()); 2214 ImpCastExprToType(From, ElType, 2215 isFloatingComplex ? CK_IntegralToFloating : CK_IntegralCast); 2216 } 2217 // y -> _Complex y 2218 ImpCastExprToType(From, ToType, 2219 isFloatingComplex ? CK_FloatingRealToComplex 2220 : CK_IntegralRealToComplex); 2221 2222 // Case 2. _Complex x -> y 2223 } else { 2224 const ComplexType *FromComplex = From->getType()->getAs<ComplexType>(); 2225 assert(FromComplex); 2226 2227 QualType ElType = FromComplex->getElementType(); 2228 bool isFloatingComplex = ElType->isRealFloatingType(); 2229 2230 // _Complex x -> x 2231 ImpCastExprToType(From, ElType, 2232 isFloatingComplex ? CK_FloatingComplexToReal 2233 : CK_IntegralComplexToReal); 2234 2235 // x -> y 2236 if (Context.hasSameUnqualifiedType(ElType, ToType)) { 2237 // do nothing 2238 } else if (ToType->isRealFloatingType()) { 2239 ImpCastExprToType(From, ToType, 2240 isFloatingComplex ? CK_FloatingCast : CK_IntegralToFloating); 2241 } else { 2242 assert(ToType->isIntegerType()); 2243 ImpCastExprToType(From, ToType, 2244 isFloatingComplex ? CK_FloatingToIntegral : CK_IntegralCast); 2245 } 2246 } 2247 break; 2248 2249 case ICK_Block_Pointer_Conversion: { 2250 ImpCastExprToType(From, ToType.getUnqualifiedType(), CK_BitCast, VK_RValue); 2251 break; 2252 } 2253 2254 case ICK_Lvalue_To_Rvalue: 2255 case ICK_Array_To_Pointer: 2256 case ICK_Function_To_Pointer: 2257 case ICK_Qualification: 2258 case ICK_Num_Conversion_Kinds: 2259 assert(false && "Improper second standard conversion"); 2260 break; 2261 } 2262 2263 switch (SCS.Third) { 2264 case ICK_Identity: 2265 // Nothing to do. 2266 break; 2267 2268 case ICK_Qualification: { 2269 // The qualification keeps the category of the inner expression, unless the 2270 // target type isn't a reference. 2271 ExprValueKind VK = ToType->isReferenceType() ? 2272 CastCategory(From) : VK_RValue; 2273 ImpCastExprToType(From, ToType.getNonLValueExprType(Context), 2274 CK_NoOp, VK); 2275 2276 if (SCS.DeprecatedStringLiteralToCharPtr) 2277 Diag(From->getLocStart(), diag::warn_deprecated_string_literal_conversion) 2278 << ToType.getNonReferenceType(); 2279 2280 break; 2281 } 2282 2283 default: 2284 assert(false && "Improper third standard conversion"); 2285 break; 2286 } 2287 2288 return false; 2289} 2290 2291ExprResult Sema::ActOnUnaryTypeTrait(UnaryTypeTrait UTT, 2292 SourceLocation KWLoc, 2293 ParsedType Ty, 2294 SourceLocation RParen) { 2295 TypeSourceInfo *TSInfo; 2296 QualType T = GetTypeFromParser(Ty, &TSInfo); 2297 2298 if (!TSInfo) 2299 TSInfo = Context.getTrivialTypeSourceInfo(T); 2300 return BuildUnaryTypeTrait(UTT, KWLoc, TSInfo, RParen); 2301} 2302 2303static bool EvaluateUnaryTypeTrait(Sema &Self, UnaryTypeTrait UTT, QualType T, 2304 SourceLocation KeyLoc) { 2305 // FIXME: For many of these traits, we need a complete type before we can 2306 // check these properties. 2307 assert(!T->isDependentType() && 2308 "Cannot evaluate traits for dependent types."); 2309 ASTContext &C = Self.Context; 2310 switch(UTT) { 2311 default: assert(false && "Unknown type trait or not implemented"); 2312 case UTT_IsPOD: return T->isPODType(); 2313 case UTT_IsLiteral: return T->isLiteralType(); 2314 case UTT_IsClass: // Fallthrough 2315 case UTT_IsUnion: 2316 if (const RecordType *Record = T->getAs<RecordType>()) { 2317 bool Union = Record->getDecl()->isUnion(); 2318 return UTT == UTT_IsUnion ? Union : !Union; 2319 } 2320 return false; 2321 case UTT_IsEnum: return T->isEnumeralType(); 2322 case UTT_IsPolymorphic: 2323 if (const RecordType *Record = T->getAs<RecordType>()) { 2324 // Type traits are only parsed in C++, so we've got CXXRecords. 2325 return cast<CXXRecordDecl>(Record->getDecl())->isPolymorphic(); 2326 } 2327 return false; 2328 case UTT_IsAbstract: 2329 if (const RecordType *RT = T->getAs<RecordType>()) 2330 return cast<CXXRecordDecl>(RT->getDecl())->isAbstract(); 2331 return false; 2332 case UTT_IsEmpty: 2333 if (const RecordType *Record = T->getAs<RecordType>()) { 2334 return !Record->getDecl()->isUnion() 2335 && cast<CXXRecordDecl>(Record->getDecl())->isEmpty(); 2336 } 2337 return false; 2338 case UTT_HasTrivialConstructor: 2339 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html: 2340 // If __is_pod (type) is true then the trait is true, else if type is 2341 // a cv class or union type (or array thereof) with a trivial default 2342 // constructor ([class.ctor]) then the trait is true, else it is false. 2343 if (T->isPODType()) 2344 return true; 2345 if (const RecordType *RT = 2346 C.getBaseElementType(T)->getAs<RecordType>()) 2347 return cast<CXXRecordDecl>(RT->getDecl())->hasTrivialConstructor(); 2348 return false; 2349 case UTT_HasTrivialCopy: 2350 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html: 2351 // If __is_pod (type) is true or type is a reference type then 2352 // the trait is true, else if type is a cv class or union type 2353 // with a trivial copy constructor ([class.copy]) then the trait 2354 // is true, else it is false. 2355 if (T->isPODType() || T->isReferenceType()) 2356 return true; 2357 if (const RecordType *RT = T->getAs<RecordType>()) 2358 return cast<CXXRecordDecl>(RT->getDecl())->hasTrivialCopyConstructor(); 2359 return false; 2360 case UTT_HasTrivialAssign: 2361 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html: 2362 // If type is const qualified or is a reference type then the 2363 // trait is false. Otherwise if __is_pod (type) is true then the 2364 // trait is true, else if type is a cv class or union type with 2365 // a trivial copy assignment ([class.copy]) then the trait is 2366 // true, else it is false. 2367 // Note: the const and reference restrictions are interesting, 2368 // given that const and reference members don't prevent a class 2369 // from having a trivial copy assignment operator (but do cause 2370 // errors if the copy assignment operator is actually used, q.v. 2371 // [class.copy]p12). 2372 2373 if (C.getBaseElementType(T).isConstQualified()) 2374 return false; 2375 if (T->isPODType()) 2376 return true; 2377 if (const RecordType *RT = T->getAs<RecordType>()) 2378 return cast<CXXRecordDecl>(RT->getDecl())->hasTrivialCopyAssignment(); 2379 return false; 2380 case UTT_HasTrivialDestructor: 2381 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html: 2382 // If __is_pod (type) is true or type is a reference type 2383 // then the trait is true, else if type is a cv class or union 2384 // type (or array thereof) with a trivial destructor 2385 // ([class.dtor]) then the trait is true, else it is 2386 // false. 2387 if (T->isPODType() || T->isReferenceType()) 2388 return true; 2389 if (const RecordType *RT = 2390 C.getBaseElementType(T)->getAs<RecordType>()) 2391 return cast<CXXRecordDecl>(RT->getDecl())->hasTrivialDestructor(); 2392 return false; 2393 // TODO: Propagate nothrowness for implicitly declared special members. 2394 case UTT_HasNothrowAssign: 2395 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html: 2396 // If type is const qualified or is a reference type then the 2397 // trait is false. Otherwise if __has_trivial_assign (type) 2398 // is true then the trait is true, else if type is a cv class 2399 // or union type with copy assignment operators that are known 2400 // not to throw an exception then the trait is true, else it is 2401 // false. 2402 if (C.getBaseElementType(T).isConstQualified()) 2403 return false; 2404 if (T->isReferenceType()) 2405 return false; 2406 if (T->isPODType()) 2407 return true; 2408 if (const RecordType *RT = T->getAs<RecordType>()) { 2409 CXXRecordDecl* RD = cast<CXXRecordDecl>(RT->getDecl()); 2410 if (RD->hasTrivialCopyAssignment()) 2411 return true; 2412 2413 bool FoundAssign = false; 2414 bool AllNoThrow = true; 2415 DeclarationName Name = C.DeclarationNames.getCXXOperatorName(OO_Equal); 2416 LookupResult Res(Self, DeclarationNameInfo(Name, KeyLoc), 2417 Sema::LookupOrdinaryName); 2418 if (Self.LookupQualifiedName(Res, RD)) { 2419 for (LookupResult::iterator Op = Res.begin(), OpEnd = Res.end(); 2420 Op != OpEnd; ++Op) { 2421 CXXMethodDecl *Operator = cast<CXXMethodDecl>(*Op); 2422 if (Operator->isCopyAssignmentOperator()) { 2423 FoundAssign = true; 2424 const FunctionProtoType *CPT 2425 = Operator->getType()->getAs<FunctionProtoType>(); 2426 if (!CPT->isNothrow(Self.Context)) { 2427 AllNoThrow = false; 2428 break; 2429 } 2430 } 2431 } 2432 } 2433 2434 return FoundAssign && AllNoThrow; 2435 } 2436 return false; 2437 case UTT_HasNothrowCopy: 2438 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html: 2439 // If __has_trivial_copy (type) is true then the trait is true, else 2440 // if type is a cv class or union type with copy constructors that are 2441 // known not to throw an exception then the trait is true, else it is 2442 // false. 2443 if (T->isPODType() || T->isReferenceType()) 2444 return true; 2445 if (const RecordType *RT = T->getAs<RecordType>()) { 2446 CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2447 if (RD->hasTrivialCopyConstructor()) 2448 return true; 2449 2450 bool FoundConstructor = false; 2451 bool AllNoThrow = true; 2452 unsigned FoundTQs; 2453 DeclContext::lookup_const_iterator Con, ConEnd; 2454 for (llvm::tie(Con, ConEnd) = Self.LookupConstructors(RD); 2455 Con != ConEnd; ++Con) { 2456 // A template constructor is never a copy constructor. 2457 // FIXME: However, it may actually be selected at the actual overload 2458 // resolution point. 2459 if (isa<FunctionTemplateDecl>(*Con)) 2460 continue; 2461 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 2462 if (Constructor->isCopyConstructor(FoundTQs)) { 2463 FoundConstructor = true; 2464 const FunctionProtoType *CPT 2465 = Constructor->getType()->getAs<FunctionProtoType>(); 2466 // FIXME: check whether evaluating default arguments can throw. 2467 // For now, we'll be conservative and assume that they can throw. 2468 if (!CPT->isNothrow(Self.Context) || CPT->getNumArgs() > 1) { 2469 AllNoThrow = false; 2470 break; 2471 } 2472 } 2473 } 2474 2475 return FoundConstructor && AllNoThrow; 2476 } 2477 return false; 2478 case UTT_HasNothrowConstructor: 2479 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html: 2480 // If __has_trivial_constructor (type) is true then the trait is 2481 // true, else if type is a cv class or union type (or array 2482 // thereof) with a default constructor that is known not to 2483 // throw an exception then the trait is true, else it is false. 2484 if (T->isPODType()) 2485 return true; 2486 if (const RecordType *RT = C.getBaseElementType(T)->getAs<RecordType>()) { 2487 CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2488 if (RD->hasTrivialConstructor()) 2489 return true; 2490 2491 DeclContext::lookup_const_iterator Con, ConEnd; 2492 for (llvm::tie(Con, ConEnd) = Self.LookupConstructors(RD); 2493 Con != ConEnd; ++Con) { 2494 // FIXME: In C++0x, a constructor template can be a default constructor. 2495 if (isa<FunctionTemplateDecl>(*Con)) 2496 continue; 2497 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 2498 if (Constructor->isDefaultConstructor()) { 2499 const FunctionProtoType *CPT 2500 = Constructor->getType()->getAs<FunctionProtoType>(); 2501 // TODO: check whether evaluating default arguments can throw. 2502 // For now, we'll be conservative and assume that they can throw. 2503 return CPT->isNothrow(Self.Context) && CPT->getNumArgs() == 0; 2504 } 2505 } 2506 } 2507 return false; 2508 case UTT_HasVirtualDestructor: 2509 // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html: 2510 // If type is a class type with a virtual destructor ([class.dtor]) 2511 // then the trait is true, else it is false. 2512 if (const RecordType *Record = T->getAs<RecordType>()) { 2513 CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl()); 2514 if (CXXDestructorDecl *Destructor = Self.LookupDestructor(RD)) 2515 return Destructor->isVirtual(); 2516 } 2517 return false; 2518 } 2519} 2520 2521ExprResult Sema::BuildUnaryTypeTrait(UnaryTypeTrait UTT, 2522 SourceLocation KWLoc, 2523 TypeSourceInfo *TSInfo, 2524 SourceLocation RParen) { 2525 QualType T = TSInfo->getType(); 2526 2527 // According to http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html 2528 // all traits except __is_class, __is_enum and __is_union require a the type 2529 // to be complete, an array of unknown bound, or void. 2530 if (UTT != UTT_IsClass && UTT != UTT_IsEnum && UTT != UTT_IsUnion) { 2531 QualType E = T; 2532 if (T->isIncompleteArrayType()) 2533 E = Context.getAsArrayType(T)->getElementType(); 2534 if (!T->isVoidType() && 2535 RequireCompleteType(KWLoc, E, 2536 diag::err_incomplete_type_used_in_type_trait_expr)) 2537 return ExprError(); 2538 } 2539 2540 bool Value = false; 2541 if (!T->isDependentType()) 2542 Value = EvaluateUnaryTypeTrait(*this, UTT, T, KWLoc); 2543 2544 return Owned(new (Context) UnaryTypeTraitExpr(KWLoc, UTT, TSInfo, Value, 2545 RParen, Context.BoolTy)); 2546} 2547 2548ExprResult Sema::ActOnBinaryTypeTrait(BinaryTypeTrait BTT, 2549 SourceLocation KWLoc, 2550 ParsedType LhsTy, 2551 ParsedType RhsTy, 2552 SourceLocation RParen) { 2553 TypeSourceInfo *LhsTSInfo; 2554 QualType LhsT = GetTypeFromParser(LhsTy, &LhsTSInfo); 2555 if (!LhsTSInfo) 2556 LhsTSInfo = Context.getTrivialTypeSourceInfo(LhsT); 2557 2558 TypeSourceInfo *RhsTSInfo; 2559 QualType RhsT = GetTypeFromParser(RhsTy, &RhsTSInfo); 2560 if (!RhsTSInfo) 2561 RhsTSInfo = Context.getTrivialTypeSourceInfo(RhsT); 2562 2563 return BuildBinaryTypeTrait(BTT, KWLoc, LhsTSInfo, RhsTSInfo, RParen); 2564} 2565 2566static bool EvaluateBinaryTypeTrait(Sema &Self, BinaryTypeTrait BTT, 2567 QualType LhsT, QualType RhsT, 2568 SourceLocation KeyLoc) { 2569 assert((!LhsT->isDependentType() || RhsT->isDependentType()) && 2570 "Cannot evaluate traits for dependent types."); 2571 2572 switch(BTT) { 2573 case BTT_IsBaseOf: { 2574 // C++0x [meta.rel]p2 2575 // Base is a base class of Derived without regard to cv-qualifiers or 2576 // Base and Derived are not unions and name the same class type without 2577 // regard to cv-qualifiers. 2578 2579 const RecordType *lhsRecord = LhsT->getAs<RecordType>(); 2580 if (!lhsRecord) return false; 2581 2582 const RecordType *rhsRecord = RhsT->getAs<RecordType>(); 2583 if (!rhsRecord) return false; 2584 2585 assert(Self.Context.hasSameUnqualifiedType(LhsT, RhsT) 2586 == (lhsRecord == rhsRecord)); 2587 2588 if (lhsRecord == rhsRecord) 2589 return !lhsRecord->getDecl()->isUnion(); 2590 2591 // C++0x [meta.rel]p2: 2592 // If Base and Derived are class types and are different types 2593 // (ignoring possible cv-qualifiers) then Derived shall be a 2594 // complete type. 2595 if (Self.RequireCompleteType(KeyLoc, RhsT, 2596 diag::err_incomplete_type_used_in_type_trait_expr)) 2597 return false; 2598 2599 return cast<CXXRecordDecl>(rhsRecord->getDecl()) 2600 ->isDerivedFrom(cast<CXXRecordDecl>(lhsRecord->getDecl())); 2601 } 2602 2603 case BTT_TypeCompatible: 2604 return Self.Context.typesAreCompatible(LhsT.getUnqualifiedType(), 2605 RhsT.getUnqualifiedType()); 2606 2607 case BTT_IsConvertibleTo: { 2608 // C++0x [meta.rel]p4: 2609 // Given the following function prototype: 2610 // 2611 // template <class T> 2612 // typename add_rvalue_reference<T>::type create(); 2613 // 2614 // the predicate condition for a template specialization 2615 // is_convertible<From, To> shall be satisfied if and only if 2616 // the return expression in the following code would be 2617 // well-formed, including any implicit conversions to the return 2618 // type of the function: 2619 // 2620 // To test() { 2621 // return create<From>(); 2622 // } 2623 // 2624 // Access checking is performed as if in a context unrelated to To and 2625 // From. Only the validity of the immediate context of the expression 2626 // of the return-statement (including conversions to the return type) 2627 // is considered. 2628 // 2629 // We model the initialization as a copy-initialization of a temporary 2630 // of the appropriate type, which for this expression is identical to the 2631 // return statement (since NRVO doesn't apply). 2632 if (LhsT->isObjectType() || LhsT->isFunctionType()) 2633 LhsT = Self.Context.getRValueReferenceType(LhsT); 2634 2635 InitializedEntity To(InitializedEntity::InitializeTemporary(RhsT)); 2636 OpaqueValueExpr From(KeyLoc, LhsT.getNonLValueExprType(Self.Context), 2637 Expr::getValueKindForType(LhsT)); 2638 Expr *FromPtr = &From; 2639 InitializationKind Kind(InitializationKind::CreateCopy(KeyLoc, 2640 SourceLocation())); 2641 2642 // Perform the initialization within a SFINAE trap at translation unit 2643 // scope. 2644 Sema::SFINAETrap SFINAE(Self, /*AccessCheckingSFINAE=*/true); 2645 Sema::ContextRAII TUContext(Self, Self.Context.getTranslationUnitDecl()); 2646 InitializationSequence Init(Self, To, Kind, &FromPtr, 1); 2647 if (Init.getKind() == InitializationSequence::FailedSequence) 2648 return false; 2649 2650 ExprResult Result = Init.Perform(Self, To, Kind, MultiExprArg(&FromPtr, 1)); 2651 return !Result.isInvalid() && !SFINAE.hasErrorOccurred(); 2652 } 2653 } 2654 llvm_unreachable("Unknown type trait or not implemented"); 2655} 2656 2657ExprResult Sema::BuildBinaryTypeTrait(BinaryTypeTrait BTT, 2658 SourceLocation KWLoc, 2659 TypeSourceInfo *LhsTSInfo, 2660 TypeSourceInfo *RhsTSInfo, 2661 SourceLocation RParen) { 2662 QualType LhsT = LhsTSInfo->getType(); 2663 QualType RhsT = RhsTSInfo->getType(); 2664 2665 if (BTT == BTT_TypeCompatible) { 2666 if (getLangOptions().CPlusPlus) { 2667 Diag(KWLoc, diag::err_types_compatible_p_in_cplusplus) 2668 << SourceRange(KWLoc, RParen); 2669 return ExprError(); 2670 } 2671 } 2672 2673 bool Value = false; 2674 if (!LhsT->isDependentType() && !RhsT->isDependentType()) 2675 Value = EvaluateBinaryTypeTrait(*this, BTT, LhsT, RhsT, KWLoc); 2676 2677 // Select trait result type. 2678 QualType ResultType; 2679 switch (BTT) { 2680 case BTT_IsBaseOf: ResultType = Context.BoolTy; break; 2681 case BTT_TypeCompatible: ResultType = Context.IntTy; break; 2682 case BTT_IsConvertibleTo: ResultType = Context.BoolTy; break; 2683 } 2684 2685 return Owned(new (Context) BinaryTypeTraitExpr(KWLoc, BTT, LhsTSInfo, 2686 RhsTSInfo, Value, RParen, 2687 ResultType)); 2688} 2689 2690QualType Sema::CheckPointerToMemberOperands(Expr *&lex, Expr *&rex, 2691 ExprValueKind &VK, 2692 SourceLocation Loc, 2693 bool isIndirect) { 2694 const char *OpSpelling = isIndirect ? "->*" : ".*"; 2695 // C++ 5.5p2 2696 // The binary operator .* [p3: ->*] binds its second operand, which shall 2697 // be of type "pointer to member of T" (where T is a completely-defined 2698 // class type) [...] 2699 QualType RType = rex->getType(); 2700 const MemberPointerType *MemPtr = RType->getAs<MemberPointerType>(); 2701 if (!MemPtr) { 2702 Diag(Loc, diag::err_bad_memptr_rhs) 2703 << OpSpelling << RType << rex->getSourceRange(); 2704 return QualType(); 2705 } 2706 2707 QualType Class(MemPtr->getClass(), 0); 2708 2709 // Note: C++ [expr.mptr.oper]p2-3 says that the class type into which the 2710 // member pointer points must be completely-defined. However, there is no 2711 // reason for this semantic distinction, and the rule is not enforced by 2712 // other compilers. Therefore, we do not check this property, as it is 2713 // likely to be considered a defect. 2714 2715 // C++ 5.5p2 2716 // [...] to its first operand, which shall be of class T or of a class of 2717 // which T is an unambiguous and accessible base class. [p3: a pointer to 2718 // such a class] 2719 QualType LType = lex->getType(); 2720 if (isIndirect) { 2721 if (const PointerType *Ptr = LType->getAs<PointerType>()) 2722 LType = Ptr->getPointeeType(); 2723 else { 2724 Diag(Loc, diag::err_bad_memptr_lhs) 2725 << OpSpelling << 1 << LType 2726 << FixItHint::CreateReplacement(SourceRange(Loc), ".*"); 2727 return QualType(); 2728 } 2729 } 2730 2731 if (!Context.hasSameUnqualifiedType(Class, LType)) { 2732 // If we want to check the hierarchy, we need a complete type. 2733 if (RequireCompleteType(Loc, LType, PDiag(diag::err_bad_memptr_lhs) 2734 << OpSpelling << (int)isIndirect)) { 2735 return QualType(); 2736 } 2737 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 2738 /*DetectVirtual=*/false); 2739 // FIXME: Would it be useful to print full ambiguity paths, or is that 2740 // overkill? 2741 if (!IsDerivedFrom(LType, Class, Paths) || 2742 Paths.isAmbiguous(Context.getCanonicalType(Class))) { 2743 Diag(Loc, diag::err_bad_memptr_lhs) << OpSpelling 2744 << (int)isIndirect << lex->getType(); 2745 return QualType(); 2746 } 2747 // Cast LHS to type of use. 2748 QualType UseType = isIndirect ? Context.getPointerType(Class) : Class; 2749 ExprValueKind VK = 2750 isIndirect ? VK_RValue : CastCategory(lex); 2751 2752 CXXCastPath BasePath; 2753 BuildBasePathArray(Paths, BasePath); 2754 ImpCastExprToType(lex, UseType, CK_DerivedToBase, VK, &BasePath); 2755 } 2756 2757 if (isa<CXXScalarValueInitExpr>(rex->IgnoreParens())) { 2758 // Diagnose use of pointer-to-member type which when used as 2759 // the functional cast in a pointer-to-member expression. 2760 Diag(Loc, diag::err_pointer_to_member_type) << isIndirect; 2761 return QualType(); 2762 } 2763 2764 // C++ 5.5p2 2765 // The result is an object or a function of the type specified by the 2766 // second operand. 2767 // The cv qualifiers are the union of those in the pointer and the left side, 2768 // in accordance with 5.5p5 and 5.2.5. 2769 // FIXME: This returns a dereferenced member function pointer as a normal 2770 // function type. However, the only operation valid on such functions is 2771 // calling them. There's also a GCC extension to get a function pointer to the 2772 // thing, which is another complication, because this type - unlike the type 2773 // that is the result of this expression - takes the class as the first 2774 // argument. 2775 // We probably need a "MemberFunctionClosureType" or something like that. 2776 QualType Result = MemPtr->getPointeeType(); 2777 Result = Context.getCVRQualifiedType(Result, LType.getCVRQualifiers()); 2778 2779 // C++0x [expr.mptr.oper]p6: 2780 // In a .* expression whose object expression is an rvalue, the program is 2781 // ill-formed if the second operand is a pointer to member function with 2782 // ref-qualifier &. In a ->* expression or in a .* expression whose object 2783 // expression is an lvalue, the program is ill-formed if the second operand 2784 // is a pointer to member function with ref-qualifier &&. 2785 if (const FunctionProtoType *Proto = Result->getAs<FunctionProtoType>()) { 2786 switch (Proto->getRefQualifier()) { 2787 case RQ_None: 2788 // Do nothing 2789 break; 2790 2791 case RQ_LValue: 2792 if (!isIndirect && !lex->Classify(Context).isLValue()) 2793 Diag(Loc, diag::err_pointer_to_member_oper_value_classify) 2794 << RType << 1 << lex->getSourceRange(); 2795 break; 2796 2797 case RQ_RValue: 2798 if (isIndirect || !lex->Classify(Context).isRValue()) 2799 Diag(Loc, diag::err_pointer_to_member_oper_value_classify) 2800 << RType << 0 << lex->getSourceRange(); 2801 break; 2802 } 2803 } 2804 2805 // C++ [expr.mptr.oper]p6: 2806 // The result of a .* expression whose second operand is a pointer 2807 // to a data member is of the same value category as its 2808 // first operand. The result of a .* expression whose second 2809 // operand is a pointer to a member function is a prvalue. The 2810 // result of an ->* expression is an lvalue if its second operand 2811 // is a pointer to data member and a prvalue otherwise. 2812 if (Result->isFunctionType()) 2813 VK = VK_RValue; 2814 else if (isIndirect) 2815 VK = VK_LValue; 2816 else 2817 VK = lex->getValueKind(); 2818 2819 return Result; 2820} 2821 2822/// \brief Try to convert a type to another according to C++0x 5.16p3. 2823/// 2824/// This is part of the parameter validation for the ? operator. If either 2825/// value operand is a class type, the two operands are attempted to be 2826/// converted to each other. This function does the conversion in one direction. 2827/// It returns true if the program is ill-formed and has already been diagnosed 2828/// as such. 2829static bool TryClassUnification(Sema &Self, Expr *From, Expr *To, 2830 SourceLocation QuestionLoc, 2831 bool &HaveConversion, 2832 QualType &ToType) { 2833 HaveConversion = false; 2834 ToType = To->getType(); 2835 2836 InitializationKind Kind = InitializationKind::CreateCopy(To->getLocStart(), 2837 SourceLocation()); 2838 // C++0x 5.16p3 2839 // The process for determining whether an operand expression E1 of type T1 2840 // can be converted to match an operand expression E2 of type T2 is defined 2841 // as follows: 2842 // -- If E2 is an lvalue: 2843 bool ToIsLvalue = To->isLValue(); 2844 if (ToIsLvalue) { 2845 // E1 can be converted to match E2 if E1 can be implicitly converted to 2846 // type "lvalue reference to T2", subject to the constraint that in the 2847 // conversion the reference must bind directly to E1. 2848 QualType T = Self.Context.getLValueReferenceType(ToType); 2849 InitializedEntity Entity = InitializedEntity::InitializeTemporary(T); 2850 2851 InitializationSequence InitSeq(Self, Entity, Kind, &From, 1); 2852 if (InitSeq.isDirectReferenceBinding()) { 2853 ToType = T; 2854 HaveConversion = true; 2855 return false; 2856 } 2857 2858 if (InitSeq.isAmbiguous()) 2859 return InitSeq.Diagnose(Self, Entity, Kind, &From, 1); 2860 } 2861 2862 // -- If E2 is an rvalue, or if the conversion above cannot be done: 2863 // -- if E1 and E2 have class type, and the underlying class types are 2864 // the same or one is a base class of the other: 2865 QualType FTy = From->getType(); 2866 QualType TTy = To->getType(); 2867 const RecordType *FRec = FTy->getAs<RecordType>(); 2868 const RecordType *TRec = TTy->getAs<RecordType>(); 2869 bool FDerivedFromT = FRec && TRec && FRec != TRec && 2870 Self.IsDerivedFrom(FTy, TTy); 2871 if (FRec && TRec && 2872 (FRec == TRec || FDerivedFromT || Self.IsDerivedFrom(TTy, FTy))) { 2873 // E1 can be converted to match E2 if the class of T2 is the 2874 // same type as, or a base class of, the class of T1, and 2875 // [cv2 > cv1]. 2876 if (FRec == TRec || FDerivedFromT) { 2877 if (TTy.isAtLeastAsQualifiedAs(FTy)) { 2878 InitializedEntity Entity = InitializedEntity::InitializeTemporary(TTy); 2879 InitializationSequence InitSeq(Self, Entity, Kind, &From, 1); 2880 if (InitSeq.getKind() != InitializationSequence::FailedSequence) { 2881 HaveConversion = true; 2882 return false; 2883 } 2884 2885 if (InitSeq.isAmbiguous()) 2886 return InitSeq.Diagnose(Self, Entity, Kind, &From, 1); 2887 } 2888 } 2889 2890 return false; 2891 } 2892 2893 // -- Otherwise: E1 can be converted to match E2 if E1 can be 2894 // implicitly converted to the type that expression E2 would have 2895 // if E2 were converted to an rvalue (or the type it has, if E2 is 2896 // an rvalue). 2897 // 2898 // This actually refers very narrowly to the lvalue-to-rvalue conversion, not 2899 // to the array-to-pointer or function-to-pointer conversions. 2900 if (!TTy->getAs<TagType>()) 2901 TTy = TTy.getUnqualifiedType(); 2902 2903 InitializedEntity Entity = InitializedEntity::InitializeTemporary(TTy); 2904 InitializationSequence InitSeq(Self, Entity, Kind, &From, 1); 2905 HaveConversion = InitSeq.getKind() != InitializationSequence::FailedSequence; 2906 ToType = TTy; 2907 if (InitSeq.isAmbiguous()) 2908 return InitSeq.Diagnose(Self, Entity, Kind, &From, 1); 2909 2910 return false; 2911} 2912 2913/// \brief Try to find a common type for two according to C++0x 5.16p5. 2914/// 2915/// This is part of the parameter validation for the ? operator. If either 2916/// value operand is a class type, overload resolution is used to find a 2917/// conversion to a common type. 2918static bool FindConditionalOverload(Sema &Self, Expr *&LHS, Expr *&RHS, 2919 SourceLocation QuestionLoc) { 2920 Expr *Args[2] = { LHS, RHS }; 2921 OverloadCandidateSet CandidateSet(QuestionLoc); 2922 Self.AddBuiltinOperatorCandidates(OO_Conditional, QuestionLoc, Args, 2, 2923 CandidateSet); 2924 2925 OverloadCandidateSet::iterator Best; 2926 switch (CandidateSet.BestViableFunction(Self, QuestionLoc, Best)) { 2927 case OR_Success: 2928 // We found a match. Perform the conversions on the arguments and move on. 2929 if (Self.PerformImplicitConversion(LHS, Best->BuiltinTypes.ParamTypes[0], 2930 Best->Conversions[0], Sema::AA_Converting) || 2931 Self.PerformImplicitConversion(RHS, Best->BuiltinTypes.ParamTypes[1], 2932 Best->Conversions[1], Sema::AA_Converting)) 2933 break; 2934 if (Best->Function) 2935 Self.MarkDeclarationReferenced(QuestionLoc, Best->Function); 2936 return false; 2937 2938 case OR_No_Viable_Function: 2939 2940 // Emit a better diagnostic if one of the expressions is a null pointer 2941 // constant and the other is a pointer type. In this case, the user most 2942 // likely forgot to take the address of the other expression. 2943 if (Self.DiagnoseConditionalForNull(LHS, RHS, QuestionLoc)) 2944 return true; 2945 2946 Self.Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 2947 << LHS->getType() << RHS->getType() 2948 << LHS->getSourceRange() << RHS->getSourceRange(); 2949 return true; 2950 2951 case OR_Ambiguous: 2952 Self.Diag(QuestionLoc, diag::err_conditional_ambiguous_ovl) 2953 << LHS->getType() << RHS->getType() 2954 << LHS->getSourceRange() << RHS->getSourceRange(); 2955 // FIXME: Print the possible common types by printing the return types of 2956 // the viable candidates. 2957 break; 2958 2959 case OR_Deleted: 2960 assert(false && "Conditional operator has only built-in overloads"); 2961 break; 2962 } 2963 return true; 2964} 2965 2966/// \brief Perform an "extended" implicit conversion as returned by 2967/// TryClassUnification. 2968static bool ConvertForConditional(Sema &Self, Expr *&E, QualType T) { 2969 InitializedEntity Entity = InitializedEntity::InitializeTemporary(T); 2970 InitializationKind Kind = InitializationKind::CreateCopy(E->getLocStart(), 2971 SourceLocation()); 2972 InitializationSequence InitSeq(Self, Entity, Kind, &E, 1); 2973 ExprResult Result = InitSeq.Perform(Self, Entity, Kind, MultiExprArg(&E, 1)); 2974 if (Result.isInvalid()) 2975 return true; 2976 2977 E = Result.takeAs<Expr>(); 2978 return false; 2979} 2980 2981/// \brief Check the operands of ?: under C++ semantics. 2982/// 2983/// See C++ [expr.cond]. Note that LHS is never null, even for the GNU x ?: y 2984/// extension. In this case, LHS == Cond. (But they're not aliases.) 2985QualType Sema::CXXCheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS, 2986 ExprValueKind &VK, ExprObjectKind &OK, 2987 SourceLocation QuestionLoc) { 2988 // FIXME: Handle C99's complex types, vector types, block pointers and Obj-C++ 2989 // interface pointers. 2990 2991 // C++0x 5.16p1 2992 // The first expression is contextually converted to bool. 2993 if (!Cond->isTypeDependent()) { 2994 if (CheckCXXBooleanCondition(Cond)) 2995 return QualType(); 2996 } 2997 2998 // Assume r-value. 2999 VK = VK_RValue; 3000 OK = OK_Ordinary; 3001 3002 // Either of the arguments dependent? 3003 if (LHS->isTypeDependent() || RHS->isTypeDependent()) 3004 return Context.DependentTy; 3005 3006 // C++0x 5.16p2 3007 // If either the second or the third operand has type (cv) void, ... 3008 QualType LTy = LHS->getType(); 3009 QualType RTy = RHS->getType(); 3010 bool LVoid = LTy->isVoidType(); 3011 bool RVoid = RTy->isVoidType(); 3012 if (LVoid || RVoid) { 3013 // ... then the [l2r] conversions are performed on the second and third 3014 // operands ... 3015 DefaultFunctionArrayLvalueConversion(LHS); 3016 DefaultFunctionArrayLvalueConversion(RHS); 3017 LTy = LHS->getType(); 3018 RTy = RHS->getType(); 3019 3020 // ... and one of the following shall hold: 3021 // -- The second or the third operand (but not both) is a throw- 3022 // expression; the result is of the type of the other and is an rvalue. 3023 bool LThrow = isa<CXXThrowExpr>(LHS); 3024 bool RThrow = isa<CXXThrowExpr>(RHS); 3025 if (LThrow && !RThrow) 3026 return RTy; 3027 if (RThrow && !LThrow) 3028 return LTy; 3029 3030 // -- Both the second and third operands have type void; the result is of 3031 // type void and is an rvalue. 3032 if (LVoid && RVoid) 3033 return Context.VoidTy; 3034 3035 // Neither holds, error. 3036 Diag(QuestionLoc, diag::err_conditional_void_nonvoid) 3037 << (LVoid ? RTy : LTy) << (LVoid ? 0 : 1) 3038 << LHS->getSourceRange() << RHS->getSourceRange(); 3039 return QualType(); 3040 } 3041 3042 // Neither is void. 3043 3044 // C++0x 5.16p3 3045 // Otherwise, if the second and third operand have different types, and 3046 // either has (cv) class type, and attempt is made to convert each of those 3047 // operands to the other. 3048 if (!Context.hasSameType(LTy, RTy) && 3049 (LTy->isRecordType() || RTy->isRecordType())) { 3050 ImplicitConversionSequence ICSLeftToRight, ICSRightToLeft; 3051 // These return true if a single direction is already ambiguous. 3052 QualType L2RType, R2LType; 3053 bool HaveL2R, HaveR2L; 3054 if (TryClassUnification(*this, LHS, RHS, QuestionLoc, HaveL2R, L2RType)) 3055 return QualType(); 3056 if (TryClassUnification(*this, RHS, LHS, QuestionLoc, HaveR2L, R2LType)) 3057 return QualType(); 3058 3059 // If both can be converted, [...] the program is ill-formed. 3060 if (HaveL2R && HaveR2L) { 3061 Diag(QuestionLoc, diag::err_conditional_ambiguous) 3062 << LTy << RTy << LHS->getSourceRange() << RHS->getSourceRange(); 3063 return QualType(); 3064 } 3065 3066 // If exactly one conversion is possible, that conversion is applied to 3067 // the chosen operand and the converted operands are used in place of the 3068 // original operands for the remainder of this section. 3069 if (HaveL2R) { 3070 if (ConvertForConditional(*this, LHS, L2RType)) 3071 return QualType(); 3072 LTy = LHS->getType(); 3073 } else if (HaveR2L) { 3074 if (ConvertForConditional(*this, RHS, R2LType)) 3075 return QualType(); 3076 RTy = RHS->getType(); 3077 } 3078 } 3079 3080 // C++0x 5.16p4 3081 // If the second and third operands are glvalues of the same value 3082 // category and have the same type, the result is of that type and 3083 // value category and it is a bit-field if the second or the third 3084 // operand is a bit-field, or if both are bit-fields. 3085 // We only extend this to bitfields, not to the crazy other kinds of 3086 // l-values. 3087 bool Same = Context.hasSameType(LTy, RTy); 3088 if (Same && 3089 LHS->isGLValue() && 3090 LHS->getValueKind() == RHS->getValueKind() && 3091 LHS->isOrdinaryOrBitFieldObject() && 3092 RHS->isOrdinaryOrBitFieldObject()) { 3093 VK = LHS->getValueKind(); 3094 if (LHS->getObjectKind() == OK_BitField || 3095 RHS->getObjectKind() == OK_BitField) 3096 OK = OK_BitField; 3097 return LTy; 3098 } 3099 3100 // C++0x 5.16p5 3101 // Otherwise, the result is an rvalue. If the second and third operands 3102 // do not have the same type, and either has (cv) class type, ... 3103 if (!Same && (LTy->isRecordType() || RTy->isRecordType())) { 3104 // ... overload resolution is used to determine the conversions (if any) 3105 // to be applied to the operands. If the overload resolution fails, the 3106 // program is ill-formed. 3107 if (FindConditionalOverload(*this, LHS, RHS, QuestionLoc)) 3108 return QualType(); 3109 } 3110 3111 // C++0x 5.16p6 3112 // LValue-to-rvalue, array-to-pointer, and function-to-pointer standard 3113 // conversions are performed on the second and third operands. 3114 DefaultFunctionArrayLvalueConversion(LHS); 3115 DefaultFunctionArrayLvalueConversion(RHS); 3116 LTy = LHS->getType(); 3117 RTy = RHS->getType(); 3118 3119 // After those conversions, one of the following shall hold: 3120 // -- The second and third operands have the same type; the result 3121 // is of that type. If the operands have class type, the result 3122 // is a prvalue temporary of the result type, which is 3123 // copy-initialized from either the second operand or the third 3124 // operand depending on the value of the first operand. 3125 if (Context.getCanonicalType(LTy) == Context.getCanonicalType(RTy)) { 3126 if (LTy->isRecordType()) { 3127 // The operands have class type. Make a temporary copy. 3128 InitializedEntity Entity = InitializedEntity::InitializeTemporary(LTy); 3129 ExprResult LHSCopy = PerformCopyInitialization(Entity, 3130 SourceLocation(), 3131 Owned(LHS)); 3132 if (LHSCopy.isInvalid()) 3133 return QualType(); 3134 3135 ExprResult RHSCopy = PerformCopyInitialization(Entity, 3136 SourceLocation(), 3137 Owned(RHS)); 3138 if (RHSCopy.isInvalid()) 3139 return QualType(); 3140 3141 LHS = LHSCopy.takeAs<Expr>(); 3142 RHS = RHSCopy.takeAs<Expr>(); 3143 } 3144 3145 return LTy; 3146 } 3147 3148 // Extension: conditional operator involving vector types. 3149 if (LTy->isVectorType() || RTy->isVectorType()) 3150 return CheckVectorOperands(QuestionLoc, LHS, RHS); 3151 3152 // -- The second and third operands have arithmetic or enumeration type; 3153 // the usual arithmetic conversions are performed to bring them to a 3154 // common type, and the result is of that type. 3155 if (LTy->isArithmeticType() && RTy->isArithmeticType()) { 3156 UsualArithmeticConversions(LHS, RHS); 3157 return LHS->getType(); 3158 } 3159 3160 // -- The second and third operands have pointer type, or one has pointer 3161 // type and the other is a null pointer constant; pointer conversions 3162 // and qualification conversions are performed to bring them to their 3163 // composite pointer type. The result is of the composite pointer type. 3164 // -- The second and third operands have pointer to member type, or one has 3165 // pointer to member type and the other is a null pointer constant; 3166 // pointer to member conversions and qualification conversions are 3167 // performed to bring them to a common type, whose cv-qualification 3168 // shall match the cv-qualification of either the second or the third 3169 // operand. The result is of the common type. 3170 bool NonStandardCompositeType = false; 3171 QualType Composite = FindCompositePointerType(QuestionLoc, LHS, RHS, 3172 isSFINAEContext()? 0 : &NonStandardCompositeType); 3173 if (!Composite.isNull()) { 3174 if (NonStandardCompositeType) 3175 Diag(QuestionLoc, 3176 diag::ext_typecheck_cond_incompatible_operands_nonstandard) 3177 << LTy << RTy << Composite 3178 << LHS->getSourceRange() << RHS->getSourceRange(); 3179 3180 return Composite; 3181 } 3182 3183 // Similarly, attempt to find composite type of two objective-c pointers. 3184 Composite = FindCompositeObjCPointerType(LHS, RHS, QuestionLoc); 3185 if (!Composite.isNull()) 3186 return Composite; 3187 3188 // Check if we are using a null with a non-pointer type. 3189 if (DiagnoseConditionalForNull(LHS, RHS, QuestionLoc)) 3190 return QualType(); 3191 3192 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 3193 << LHS->getType() << RHS->getType() 3194 << LHS->getSourceRange() << RHS->getSourceRange(); 3195 return QualType(); 3196} 3197 3198/// \brief Find a merged pointer type and convert the two expressions to it. 3199/// 3200/// This finds the composite pointer type (or member pointer type) for @p E1 3201/// and @p E2 according to C++0x 5.9p2. It converts both expressions to this 3202/// type and returns it. 3203/// It does not emit diagnostics. 3204/// 3205/// \param Loc The location of the operator requiring these two expressions to 3206/// be converted to the composite pointer type. 3207/// 3208/// If \p NonStandardCompositeType is non-NULL, then we are permitted to find 3209/// a non-standard (but still sane) composite type to which both expressions 3210/// can be converted. When such a type is chosen, \c *NonStandardCompositeType 3211/// will be set true. 3212QualType Sema::FindCompositePointerType(SourceLocation Loc, 3213 Expr *&E1, Expr *&E2, 3214 bool *NonStandardCompositeType) { 3215 if (NonStandardCompositeType) 3216 *NonStandardCompositeType = false; 3217 3218 assert(getLangOptions().CPlusPlus && "This function assumes C++"); 3219 QualType T1 = E1->getType(), T2 = E2->getType(); 3220 3221 if (!T1->isAnyPointerType() && !T1->isMemberPointerType() && 3222 !T2->isAnyPointerType() && !T2->isMemberPointerType()) 3223 return QualType(); 3224 3225 // C++0x 5.9p2 3226 // Pointer conversions and qualification conversions are performed on 3227 // pointer operands to bring them to their composite pointer type. If 3228 // one operand is a null pointer constant, the composite pointer type is 3229 // the type of the other operand. 3230 if (E1->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) { 3231 if (T2->isMemberPointerType()) 3232 ImpCastExprToType(E1, T2, CK_NullToMemberPointer); 3233 else 3234 ImpCastExprToType(E1, T2, CK_NullToPointer); 3235 return T2; 3236 } 3237 if (E2->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) { 3238 if (T1->isMemberPointerType()) 3239 ImpCastExprToType(E2, T1, CK_NullToMemberPointer); 3240 else 3241 ImpCastExprToType(E2, T1, CK_NullToPointer); 3242 return T1; 3243 } 3244 3245 // Now both have to be pointers or member pointers. 3246 if ((!T1->isPointerType() && !T1->isMemberPointerType()) || 3247 (!T2->isPointerType() && !T2->isMemberPointerType())) 3248 return QualType(); 3249 3250 // Otherwise, of one of the operands has type "pointer to cv1 void," then 3251 // the other has type "pointer to cv2 T" and the composite pointer type is 3252 // "pointer to cv12 void," where cv12 is the union of cv1 and cv2. 3253 // Otherwise, the composite pointer type is a pointer type similar to the 3254 // type of one of the operands, with a cv-qualification signature that is 3255 // the union of the cv-qualification signatures of the operand types. 3256 // In practice, the first part here is redundant; it's subsumed by the second. 3257 // What we do here is, we build the two possible composite types, and try the 3258 // conversions in both directions. If only one works, or if the two composite 3259 // types are the same, we have succeeded. 3260 // FIXME: extended qualifiers? 3261 typedef llvm::SmallVector<unsigned, 4> QualifierVector; 3262 QualifierVector QualifierUnion; 3263 typedef llvm::SmallVector<std::pair<const Type *, const Type *>, 4> 3264 ContainingClassVector; 3265 ContainingClassVector MemberOfClass; 3266 QualType Composite1 = Context.getCanonicalType(T1), 3267 Composite2 = Context.getCanonicalType(T2); 3268 unsigned NeedConstBefore = 0; 3269 do { 3270 const PointerType *Ptr1, *Ptr2; 3271 if ((Ptr1 = Composite1->getAs<PointerType>()) && 3272 (Ptr2 = Composite2->getAs<PointerType>())) { 3273 Composite1 = Ptr1->getPointeeType(); 3274 Composite2 = Ptr2->getPointeeType(); 3275 3276 // If we're allowed to create a non-standard composite type, keep track 3277 // of where we need to fill in additional 'const' qualifiers. 3278 if (NonStandardCompositeType && 3279 Composite1.getCVRQualifiers() != Composite2.getCVRQualifiers()) 3280 NeedConstBefore = QualifierUnion.size(); 3281 3282 QualifierUnion.push_back( 3283 Composite1.getCVRQualifiers() | Composite2.getCVRQualifiers()); 3284 MemberOfClass.push_back(std::make_pair((const Type *)0, (const Type *)0)); 3285 continue; 3286 } 3287 3288 const MemberPointerType *MemPtr1, *MemPtr2; 3289 if ((MemPtr1 = Composite1->getAs<MemberPointerType>()) && 3290 (MemPtr2 = Composite2->getAs<MemberPointerType>())) { 3291 Composite1 = MemPtr1->getPointeeType(); 3292 Composite2 = MemPtr2->getPointeeType(); 3293 3294 // If we're allowed to create a non-standard composite type, keep track 3295 // of where we need to fill in additional 'const' qualifiers. 3296 if (NonStandardCompositeType && 3297 Composite1.getCVRQualifiers() != Composite2.getCVRQualifiers()) 3298 NeedConstBefore = QualifierUnion.size(); 3299 3300 QualifierUnion.push_back( 3301 Composite1.getCVRQualifiers() | Composite2.getCVRQualifiers()); 3302 MemberOfClass.push_back(std::make_pair(MemPtr1->getClass(), 3303 MemPtr2->getClass())); 3304 continue; 3305 } 3306 3307 // FIXME: block pointer types? 3308 3309 // Cannot unwrap any more types. 3310 break; 3311 } while (true); 3312 3313 if (NeedConstBefore && NonStandardCompositeType) { 3314 // Extension: Add 'const' to qualifiers that come before the first qualifier 3315 // mismatch, so that our (non-standard!) composite type meets the 3316 // requirements of C++ [conv.qual]p4 bullet 3. 3317 for (unsigned I = 0; I != NeedConstBefore; ++I) { 3318 if ((QualifierUnion[I] & Qualifiers::Const) == 0) { 3319 QualifierUnion[I] = QualifierUnion[I] | Qualifiers::Const; 3320 *NonStandardCompositeType = true; 3321 } 3322 } 3323 } 3324 3325 // Rewrap the composites as pointers or member pointers with the union CVRs. 3326 ContainingClassVector::reverse_iterator MOC 3327 = MemberOfClass.rbegin(); 3328 for (QualifierVector::reverse_iterator 3329 I = QualifierUnion.rbegin(), 3330 E = QualifierUnion.rend(); 3331 I != E; (void)++I, ++MOC) { 3332 Qualifiers Quals = Qualifiers::fromCVRMask(*I); 3333 if (MOC->first && MOC->second) { 3334 // Rebuild member pointer type 3335 Composite1 = Context.getMemberPointerType( 3336 Context.getQualifiedType(Composite1, Quals), 3337 MOC->first); 3338 Composite2 = Context.getMemberPointerType( 3339 Context.getQualifiedType(Composite2, Quals), 3340 MOC->second); 3341 } else { 3342 // Rebuild pointer type 3343 Composite1 3344 = Context.getPointerType(Context.getQualifiedType(Composite1, Quals)); 3345 Composite2 3346 = Context.getPointerType(Context.getQualifiedType(Composite2, Quals)); 3347 } 3348 } 3349 3350 // Try to convert to the first composite pointer type. 3351 InitializedEntity Entity1 3352 = InitializedEntity::InitializeTemporary(Composite1); 3353 InitializationKind Kind 3354 = InitializationKind::CreateCopy(Loc, SourceLocation()); 3355 InitializationSequence E1ToC1(*this, Entity1, Kind, &E1, 1); 3356 InitializationSequence E2ToC1(*this, Entity1, Kind, &E2, 1); 3357 3358 if (E1ToC1 && E2ToC1) { 3359 // Conversion to Composite1 is viable. 3360 if (!Context.hasSameType(Composite1, Composite2)) { 3361 // Composite2 is a different type from Composite1. Check whether 3362 // Composite2 is also viable. 3363 InitializedEntity Entity2 3364 = InitializedEntity::InitializeTemporary(Composite2); 3365 InitializationSequence E1ToC2(*this, Entity2, Kind, &E1, 1); 3366 InitializationSequence E2ToC2(*this, Entity2, Kind, &E2, 1); 3367 if (E1ToC2 && E2ToC2) { 3368 // Both Composite1 and Composite2 are viable and are different; 3369 // this is an ambiguity. 3370 return QualType(); 3371 } 3372 } 3373 3374 // Convert E1 to Composite1 3375 ExprResult E1Result 3376 = E1ToC1.Perform(*this, Entity1, Kind, MultiExprArg(*this,&E1,1)); 3377 if (E1Result.isInvalid()) 3378 return QualType(); 3379 E1 = E1Result.takeAs<Expr>(); 3380 3381 // Convert E2 to Composite1 3382 ExprResult E2Result 3383 = E2ToC1.Perform(*this, Entity1, Kind, MultiExprArg(*this,&E2,1)); 3384 if (E2Result.isInvalid()) 3385 return QualType(); 3386 E2 = E2Result.takeAs<Expr>(); 3387 3388 return Composite1; 3389 } 3390 3391 // Check whether Composite2 is viable. 3392 InitializedEntity Entity2 3393 = InitializedEntity::InitializeTemporary(Composite2); 3394 InitializationSequence E1ToC2(*this, Entity2, Kind, &E1, 1); 3395 InitializationSequence E2ToC2(*this, Entity2, Kind, &E2, 1); 3396 if (!E1ToC2 || !E2ToC2) 3397 return QualType(); 3398 3399 // Convert E1 to Composite2 3400 ExprResult E1Result 3401 = E1ToC2.Perform(*this, Entity2, Kind, MultiExprArg(*this, &E1, 1)); 3402 if (E1Result.isInvalid()) 3403 return QualType(); 3404 E1 = E1Result.takeAs<Expr>(); 3405 3406 // Convert E2 to Composite2 3407 ExprResult E2Result 3408 = E2ToC2.Perform(*this, Entity2, Kind, MultiExprArg(*this, &E2, 1)); 3409 if (E2Result.isInvalid()) 3410 return QualType(); 3411 E2 = E2Result.takeAs<Expr>(); 3412 3413 return Composite2; 3414} 3415 3416ExprResult Sema::MaybeBindToTemporary(Expr *E) { 3417 if (!E) 3418 return ExprError(); 3419 3420 if (!Context.getLangOptions().CPlusPlus) 3421 return Owned(E); 3422 3423 assert(!isa<CXXBindTemporaryExpr>(E) && "Double-bound temporary?"); 3424 3425 const RecordType *RT = E->getType()->getAs<RecordType>(); 3426 if (!RT) 3427 return Owned(E); 3428 3429 // If the result is a glvalue, we shouldn't bind it. 3430 if (E->Classify(Context).isGLValue()) 3431 return Owned(E); 3432 3433 // That should be enough to guarantee that this type is complete. 3434 // If it has a trivial destructor, we can avoid the extra copy. 3435 CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3436 if (RD->isInvalidDecl() || RD->hasTrivialDestructor()) 3437 return Owned(E); 3438 3439 CXXTemporary *Temp = CXXTemporary::Create(Context, LookupDestructor(RD)); 3440 ExprTemporaries.push_back(Temp); 3441 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 3442 MarkDeclarationReferenced(E->getExprLoc(), Destructor); 3443 CheckDestructorAccess(E->getExprLoc(), Destructor, 3444 PDiag(diag::err_access_dtor_temp) 3445 << E->getType()); 3446 } 3447 // FIXME: Add the temporary to the temporaries vector. 3448 return Owned(CXXBindTemporaryExpr::Create(Context, Temp, E)); 3449} 3450 3451Expr *Sema::MaybeCreateExprWithCleanups(Expr *SubExpr) { 3452 assert(SubExpr && "sub expression can't be null!"); 3453 3454 unsigned FirstTemporary = ExprEvalContexts.back().NumTemporaries; 3455 assert(ExprTemporaries.size() >= FirstTemporary); 3456 if (ExprTemporaries.size() == FirstTemporary) 3457 return SubExpr; 3458 3459 Expr *E = ExprWithCleanups::Create(Context, SubExpr, 3460 &ExprTemporaries[FirstTemporary], 3461 ExprTemporaries.size() - FirstTemporary); 3462 ExprTemporaries.erase(ExprTemporaries.begin() + FirstTemporary, 3463 ExprTemporaries.end()); 3464 3465 return E; 3466} 3467 3468ExprResult 3469Sema::MaybeCreateExprWithCleanups(ExprResult SubExpr) { 3470 if (SubExpr.isInvalid()) 3471 return ExprError(); 3472 3473 return Owned(MaybeCreateExprWithCleanups(SubExpr.take())); 3474} 3475 3476Stmt *Sema::MaybeCreateStmtWithCleanups(Stmt *SubStmt) { 3477 assert(SubStmt && "sub statement can't be null!"); 3478 3479 unsigned FirstTemporary = ExprEvalContexts.back().NumTemporaries; 3480 assert(ExprTemporaries.size() >= FirstTemporary); 3481 if (ExprTemporaries.size() == FirstTemporary) 3482 return SubStmt; 3483 3484 // FIXME: In order to attach the temporaries, wrap the statement into 3485 // a StmtExpr; currently this is only used for asm statements. 3486 // This is hacky, either create a new CXXStmtWithTemporaries statement or 3487 // a new AsmStmtWithTemporaries. 3488 CompoundStmt *CompStmt = new (Context) CompoundStmt(Context, &SubStmt, 1, 3489 SourceLocation(), 3490 SourceLocation()); 3491 Expr *E = new (Context) StmtExpr(CompStmt, Context.VoidTy, SourceLocation(), 3492 SourceLocation()); 3493 return MaybeCreateExprWithCleanups(E); 3494} 3495 3496ExprResult 3497Sema::ActOnStartCXXMemberReference(Scope *S, Expr *Base, SourceLocation OpLoc, 3498 tok::TokenKind OpKind, ParsedType &ObjectType, 3499 bool &MayBePseudoDestructor) { 3500 // Since this might be a postfix expression, get rid of ParenListExprs. 3501 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Base); 3502 if (Result.isInvalid()) return ExprError(); 3503 Base = Result.get(); 3504 3505 QualType BaseType = Base->getType(); 3506 MayBePseudoDestructor = false; 3507 if (BaseType->isDependentType()) { 3508 // If we have a pointer to a dependent type and are using the -> operator, 3509 // the object type is the type that the pointer points to. We might still 3510 // have enough information about that type to do something useful. 3511 if (OpKind == tok::arrow) 3512 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) 3513 BaseType = Ptr->getPointeeType(); 3514 3515 ObjectType = ParsedType::make(BaseType); 3516 MayBePseudoDestructor = true; 3517 return Owned(Base); 3518 } 3519 3520 // C++ [over.match.oper]p8: 3521 // [...] When operator->returns, the operator-> is applied to the value 3522 // returned, with the original second operand. 3523 if (OpKind == tok::arrow) { 3524 // The set of types we've considered so far. 3525 llvm::SmallPtrSet<CanQualType,8> CTypes; 3526 llvm::SmallVector<SourceLocation, 8> Locations; 3527 CTypes.insert(Context.getCanonicalType(BaseType)); 3528 3529 while (BaseType->isRecordType()) { 3530 Result = BuildOverloadedArrowExpr(S, Base, OpLoc); 3531 if (Result.isInvalid()) 3532 return ExprError(); 3533 Base = Result.get(); 3534 if (CXXOperatorCallExpr *OpCall = dyn_cast<CXXOperatorCallExpr>(Base)) 3535 Locations.push_back(OpCall->getDirectCallee()->getLocation()); 3536 BaseType = Base->getType(); 3537 CanQualType CBaseType = Context.getCanonicalType(BaseType); 3538 if (!CTypes.insert(CBaseType)) { 3539 Diag(OpLoc, diag::err_operator_arrow_circular); 3540 for (unsigned i = 0; i < Locations.size(); i++) 3541 Diag(Locations[i], diag::note_declared_at); 3542 return ExprError(); 3543 } 3544 } 3545 3546 if (BaseType->isPointerType()) 3547 BaseType = BaseType->getPointeeType(); 3548 } 3549 3550 // We could end up with various non-record types here, such as extended 3551 // vector types or Objective-C interfaces. Just return early and let 3552 // ActOnMemberReferenceExpr do the work. 3553 if (!BaseType->isRecordType()) { 3554 // C++ [basic.lookup.classref]p2: 3555 // [...] If the type of the object expression is of pointer to scalar 3556 // type, the unqualified-id is looked up in the context of the complete 3557 // postfix-expression. 3558 // 3559 // This also indicates that we should be parsing a 3560 // pseudo-destructor-name. 3561 ObjectType = ParsedType(); 3562 MayBePseudoDestructor = true; 3563 return Owned(Base); 3564 } 3565 3566 // The object type must be complete (or dependent). 3567 if (!BaseType->isDependentType() && 3568 RequireCompleteType(OpLoc, BaseType, 3569 PDiag(diag::err_incomplete_member_access))) 3570 return ExprError(); 3571 3572 // C++ [basic.lookup.classref]p2: 3573 // If the id-expression in a class member access (5.2.5) is an 3574 // unqualified-id, and the type of the object expression is of a class 3575 // type C (or of pointer to a class type C), the unqualified-id is looked 3576 // up in the scope of class C. [...] 3577 ObjectType = ParsedType::make(BaseType); 3578 return move(Base); 3579} 3580 3581ExprResult Sema::DiagnoseDtorReference(SourceLocation NameLoc, 3582 Expr *MemExpr) { 3583 SourceLocation ExpectedLParenLoc = PP.getLocForEndOfToken(NameLoc); 3584 Diag(MemExpr->getLocStart(), diag::err_dtor_expr_without_call) 3585 << isa<CXXPseudoDestructorExpr>(MemExpr) 3586 << FixItHint::CreateInsertion(ExpectedLParenLoc, "()"); 3587 3588 return ActOnCallExpr(/*Scope*/ 0, 3589 MemExpr, 3590 /*LPLoc*/ ExpectedLParenLoc, 3591 MultiExprArg(), 3592 /*RPLoc*/ ExpectedLParenLoc); 3593} 3594 3595ExprResult Sema::BuildPseudoDestructorExpr(Expr *Base, 3596 SourceLocation OpLoc, 3597 tok::TokenKind OpKind, 3598 const CXXScopeSpec &SS, 3599 TypeSourceInfo *ScopeTypeInfo, 3600 SourceLocation CCLoc, 3601 SourceLocation TildeLoc, 3602 PseudoDestructorTypeStorage Destructed, 3603 bool HasTrailingLParen) { 3604 TypeSourceInfo *DestructedTypeInfo = Destructed.getTypeSourceInfo(); 3605 3606 // C++ [expr.pseudo]p2: 3607 // The left-hand side of the dot operator shall be of scalar type. The 3608 // left-hand side of the arrow operator shall be of pointer to scalar type. 3609 // This scalar type is the object type. 3610 QualType ObjectType = Base->getType(); 3611 if (OpKind == tok::arrow) { 3612 if (const PointerType *Ptr = ObjectType->getAs<PointerType>()) { 3613 ObjectType = Ptr->getPointeeType(); 3614 } else if (!Base->isTypeDependent()) { 3615 // The user wrote "p->" when she probably meant "p."; fix it. 3616 Diag(OpLoc, diag::err_typecheck_member_reference_suggestion) 3617 << ObjectType << true 3618 << FixItHint::CreateReplacement(OpLoc, "."); 3619 if (isSFINAEContext()) 3620 return ExprError(); 3621 3622 OpKind = tok::period; 3623 } 3624 } 3625 3626 if (!ObjectType->isDependentType() && !ObjectType->isScalarType()) { 3627 Diag(OpLoc, diag::err_pseudo_dtor_base_not_scalar) 3628 << ObjectType << Base->getSourceRange(); 3629 return ExprError(); 3630 } 3631 3632 // C++ [expr.pseudo]p2: 3633 // [...] The cv-unqualified versions of the object type and of the type 3634 // designated by the pseudo-destructor-name shall be the same type. 3635 if (DestructedTypeInfo) { 3636 QualType DestructedType = DestructedTypeInfo->getType(); 3637 SourceLocation DestructedTypeStart 3638 = DestructedTypeInfo->getTypeLoc().getLocalSourceRange().getBegin(); 3639 if (!DestructedType->isDependentType() && !ObjectType->isDependentType() && 3640 !Context.hasSameUnqualifiedType(DestructedType, ObjectType)) { 3641 Diag(DestructedTypeStart, diag::err_pseudo_dtor_type_mismatch) 3642 << ObjectType << DestructedType << Base->getSourceRange() 3643 << DestructedTypeInfo->getTypeLoc().getLocalSourceRange(); 3644 3645 // Recover by setting the destructed type to the object type. 3646 DestructedType = ObjectType; 3647 DestructedTypeInfo = Context.getTrivialTypeSourceInfo(ObjectType, 3648 DestructedTypeStart); 3649 Destructed = PseudoDestructorTypeStorage(DestructedTypeInfo); 3650 } 3651 } 3652 3653 // C++ [expr.pseudo]p2: 3654 // [...] Furthermore, the two type-names in a pseudo-destructor-name of the 3655 // form 3656 // 3657 // ::[opt] nested-name-specifier[opt] type-name :: ~ type-name 3658 // 3659 // shall designate the same scalar type. 3660 if (ScopeTypeInfo) { 3661 QualType ScopeType = ScopeTypeInfo->getType(); 3662 if (!ScopeType->isDependentType() && !ObjectType->isDependentType() && 3663 !Context.hasSameUnqualifiedType(ScopeType, ObjectType)) { 3664 3665 Diag(ScopeTypeInfo->getTypeLoc().getLocalSourceRange().getBegin(), 3666 diag::err_pseudo_dtor_type_mismatch) 3667 << ObjectType << ScopeType << Base->getSourceRange() 3668 << ScopeTypeInfo->getTypeLoc().getLocalSourceRange(); 3669 3670 ScopeType = QualType(); 3671 ScopeTypeInfo = 0; 3672 } 3673 } 3674 3675 Expr *Result 3676 = new (Context) CXXPseudoDestructorExpr(Context, Base, 3677 OpKind == tok::arrow, OpLoc, 3678 SS.getWithLocInContext(Context), 3679 ScopeTypeInfo, 3680 CCLoc, 3681 TildeLoc, 3682 Destructed); 3683 3684 if (HasTrailingLParen) 3685 return Owned(Result); 3686 3687 return DiagnoseDtorReference(Destructed.getLocation(), Result); 3688} 3689 3690ExprResult Sema::ActOnPseudoDestructorExpr(Scope *S, Expr *Base, 3691 SourceLocation OpLoc, 3692 tok::TokenKind OpKind, 3693 CXXScopeSpec &SS, 3694 UnqualifiedId &FirstTypeName, 3695 SourceLocation CCLoc, 3696 SourceLocation TildeLoc, 3697 UnqualifiedId &SecondTypeName, 3698 bool HasTrailingLParen) { 3699 assert((FirstTypeName.getKind() == UnqualifiedId::IK_TemplateId || 3700 FirstTypeName.getKind() == UnqualifiedId::IK_Identifier) && 3701 "Invalid first type name in pseudo-destructor"); 3702 assert((SecondTypeName.getKind() == UnqualifiedId::IK_TemplateId || 3703 SecondTypeName.getKind() == UnqualifiedId::IK_Identifier) && 3704 "Invalid second type name in pseudo-destructor"); 3705 3706 // C++ [expr.pseudo]p2: 3707 // The left-hand side of the dot operator shall be of scalar type. The 3708 // left-hand side of the arrow operator shall be of pointer to scalar type. 3709 // This scalar type is the object type. 3710 QualType ObjectType = Base->getType(); 3711 if (OpKind == tok::arrow) { 3712 if (const PointerType *Ptr = ObjectType->getAs<PointerType>()) { 3713 ObjectType = Ptr->getPointeeType(); 3714 } else if (!ObjectType->isDependentType()) { 3715 // The user wrote "p->" when she probably meant "p."; fix it. 3716 Diag(OpLoc, diag::err_typecheck_member_reference_suggestion) 3717 << ObjectType << true 3718 << FixItHint::CreateReplacement(OpLoc, "."); 3719 if (isSFINAEContext()) 3720 return ExprError(); 3721 3722 OpKind = tok::period; 3723 } 3724 } 3725 3726 // Compute the object type that we should use for name lookup purposes. Only 3727 // record types and dependent types matter. 3728 ParsedType ObjectTypePtrForLookup; 3729 if (!SS.isSet()) { 3730 if (ObjectType->isRecordType()) 3731 ObjectTypePtrForLookup = ParsedType::make(ObjectType); 3732 else if (ObjectType->isDependentType()) 3733 ObjectTypePtrForLookup = ParsedType::make(Context.DependentTy); 3734 } 3735 3736 // Convert the name of the type being destructed (following the ~) into a 3737 // type (with source-location information). 3738 QualType DestructedType; 3739 TypeSourceInfo *DestructedTypeInfo = 0; 3740 PseudoDestructorTypeStorage Destructed; 3741 if (SecondTypeName.getKind() == UnqualifiedId::IK_Identifier) { 3742 ParsedType T = getTypeName(*SecondTypeName.Identifier, 3743 SecondTypeName.StartLocation, 3744 S, &SS, true, false, ObjectTypePtrForLookup); 3745 if (!T && 3746 ((SS.isSet() && !computeDeclContext(SS, false)) || 3747 (!SS.isSet() && ObjectType->isDependentType()))) { 3748 // The name of the type being destroyed is a dependent name, and we 3749 // couldn't find anything useful in scope. Just store the identifier and 3750 // it's location, and we'll perform (qualified) name lookup again at 3751 // template instantiation time. 3752 Destructed = PseudoDestructorTypeStorage(SecondTypeName.Identifier, 3753 SecondTypeName.StartLocation); 3754 } else if (!T) { 3755 Diag(SecondTypeName.StartLocation, 3756 diag::err_pseudo_dtor_destructor_non_type) 3757 << SecondTypeName.Identifier << ObjectType; 3758 if (isSFINAEContext()) 3759 return ExprError(); 3760 3761 // Recover by assuming we had the right type all along. 3762 DestructedType = ObjectType; 3763 } else 3764 DestructedType = GetTypeFromParser(T, &DestructedTypeInfo); 3765 } else { 3766 // Resolve the template-id to a type. 3767 TemplateIdAnnotation *TemplateId = SecondTypeName.TemplateId; 3768 ASTTemplateArgsPtr TemplateArgsPtr(*this, 3769 TemplateId->getTemplateArgs(), 3770 TemplateId->NumArgs); 3771 TypeResult T = ActOnTemplateIdType(TemplateId->SS, 3772 TemplateId->Template, 3773 TemplateId->TemplateNameLoc, 3774 TemplateId->LAngleLoc, 3775 TemplateArgsPtr, 3776 TemplateId->RAngleLoc); 3777 if (T.isInvalid() || !T.get()) { 3778 // Recover by assuming we had the right type all along. 3779 DestructedType = ObjectType; 3780 } else 3781 DestructedType = GetTypeFromParser(T.get(), &DestructedTypeInfo); 3782 } 3783 3784 // If we've performed some kind of recovery, (re-)build the type source 3785 // information. 3786 if (!DestructedType.isNull()) { 3787 if (!DestructedTypeInfo) 3788 DestructedTypeInfo = Context.getTrivialTypeSourceInfo(DestructedType, 3789 SecondTypeName.StartLocation); 3790 Destructed = PseudoDestructorTypeStorage(DestructedTypeInfo); 3791 } 3792 3793 // Convert the name of the scope type (the type prior to '::') into a type. 3794 TypeSourceInfo *ScopeTypeInfo = 0; 3795 QualType ScopeType; 3796 if (FirstTypeName.getKind() == UnqualifiedId::IK_TemplateId || 3797 FirstTypeName.Identifier) { 3798 if (FirstTypeName.getKind() == UnqualifiedId::IK_Identifier) { 3799 ParsedType T = getTypeName(*FirstTypeName.Identifier, 3800 FirstTypeName.StartLocation, 3801 S, &SS, true, false, ObjectTypePtrForLookup); 3802 if (!T) { 3803 Diag(FirstTypeName.StartLocation, 3804 diag::err_pseudo_dtor_destructor_non_type) 3805 << FirstTypeName.Identifier << ObjectType; 3806 3807 if (isSFINAEContext()) 3808 return ExprError(); 3809 3810 // Just drop this type. It's unnecessary anyway. 3811 ScopeType = QualType(); 3812 } else 3813 ScopeType = GetTypeFromParser(T, &ScopeTypeInfo); 3814 } else { 3815 // Resolve the template-id to a type. 3816 TemplateIdAnnotation *TemplateId = FirstTypeName.TemplateId; 3817 ASTTemplateArgsPtr TemplateArgsPtr(*this, 3818 TemplateId->getTemplateArgs(), 3819 TemplateId->NumArgs); 3820 TypeResult T = ActOnTemplateIdType(TemplateId->SS, 3821 TemplateId->Template, 3822 TemplateId->TemplateNameLoc, 3823 TemplateId->LAngleLoc, 3824 TemplateArgsPtr, 3825 TemplateId->RAngleLoc); 3826 if (T.isInvalid() || !T.get()) { 3827 // Recover by dropping this type. 3828 ScopeType = QualType(); 3829 } else 3830 ScopeType = GetTypeFromParser(T.get(), &ScopeTypeInfo); 3831 } 3832 } 3833 3834 if (!ScopeType.isNull() && !ScopeTypeInfo) 3835 ScopeTypeInfo = Context.getTrivialTypeSourceInfo(ScopeType, 3836 FirstTypeName.StartLocation); 3837 3838 3839 return BuildPseudoDestructorExpr(Base, OpLoc, OpKind, SS, 3840 ScopeTypeInfo, CCLoc, TildeLoc, 3841 Destructed, HasTrailingLParen); 3842} 3843 3844ExprResult Sema::BuildCXXMemberCallExpr(Expr *Exp, NamedDecl *FoundDecl, 3845 CXXMethodDecl *Method) { 3846 if (PerformObjectArgumentInitialization(Exp, /*Qualifier=*/0, 3847 FoundDecl, Method)) 3848 return true; 3849 3850 MemberExpr *ME = 3851 new (Context) MemberExpr(Exp, /*IsArrow=*/false, Method, 3852 SourceLocation(), Method->getType(), 3853 VK_RValue, OK_Ordinary); 3854 QualType ResultType = Method->getResultType(); 3855 ExprValueKind VK = Expr::getValueKindForType(ResultType); 3856 ResultType = ResultType.getNonLValueExprType(Context); 3857 3858 MarkDeclarationReferenced(Exp->getLocStart(), Method); 3859 CXXMemberCallExpr *CE = 3860 new (Context) CXXMemberCallExpr(Context, ME, 0, 0, ResultType, VK, 3861 Exp->getLocEnd()); 3862 return CE; 3863} 3864 3865ExprResult Sema::BuildCXXNoexceptExpr(SourceLocation KeyLoc, Expr *Operand, 3866 SourceLocation RParen) { 3867 return Owned(new (Context) CXXNoexceptExpr(Context.BoolTy, Operand, 3868 Operand->CanThrow(Context), 3869 KeyLoc, RParen)); 3870} 3871 3872ExprResult Sema::ActOnNoexceptExpr(SourceLocation KeyLoc, SourceLocation, 3873 Expr *Operand, SourceLocation RParen) { 3874 return BuildCXXNoexceptExpr(KeyLoc, Operand, RParen); 3875} 3876 3877/// Perform the conversions required for an expression used in a 3878/// context that ignores the result. 3879void Sema::IgnoredValueConversions(Expr *&E) { 3880 // C99 6.3.2.1: 3881 // [Except in specific positions,] an lvalue that does not have 3882 // array type is converted to the value stored in the 3883 // designated object (and is no longer an lvalue). 3884 if (E->isRValue()) return; 3885 3886 // We always want to do this on ObjC property references. 3887 if (E->getObjectKind() == OK_ObjCProperty) { 3888 ConvertPropertyForRValue(E); 3889 if (E->isRValue()) return; 3890 } 3891 3892 // Otherwise, this rule does not apply in C++, at least not for the moment. 3893 if (getLangOptions().CPlusPlus) return; 3894 3895 // GCC seems to also exclude expressions of incomplete enum type. 3896 if (const EnumType *T = E->getType()->getAs<EnumType>()) { 3897 if (!T->getDecl()->isComplete()) { 3898 // FIXME: stupid workaround for a codegen bug! 3899 ImpCastExprToType(E, Context.VoidTy, CK_ToVoid); 3900 return; 3901 } 3902 } 3903 3904 DefaultFunctionArrayLvalueConversion(E); 3905 if (!E->getType()->isVoidType()) 3906 RequireCompleteType(E->getExprLoc(), E->getType(), 3907 diag::err_incomplete_type); 3908} 3909 3910ExprResult Sema::ActOnFinishFullExpr(Expr *FullExpr) { 3911 if (!FullExpr) 3912 return ExprError(); 3913 3914 if (DiagnoseUnexpandedParameterPack(FullExpr)) 3915 return ExprError(); 3916 3917 // 13.4.1 ... An overloaded function name shall not be used without arguments 3918 // in contexts other than those listed [i.e list of targets]. 3919 // 3920 // void foo(); void foo(int); 3921 // template<class T> void fooT(); template<class T> void fooT(int); 3922 3923 // Therefore these should error: 3924 // foo; 3925 // fooT<int>; 3926 3927 if (FullExpr->getType() == Context.OverloadTy) { 3928 if (!ResolveSingleFunctionTemplateSpecialization(FullExpr, 3929 /* Complain */ false)) { 3930 OverloadExpr* OvlExpr = OverloadExpr::find(FullExpr).Expression; 3931 Diag(FullExpr->getLocStart(), diag::err_addr_ovl_ambiguous) 3932 << OvlExpr->getName(); 3933 NoteAllOverloadCandidates(OvlExpr); 3934 return ExprError(); 3935 } 3936 } 3937 3938 3939 IgnoredValueConversions(FullExpr); 3940 CheckImplicitConversions(FullExpr); 3941 3942 return MaybeCreateExprWithCleanups(FullExpr); 3943} 3944 3945StmtResult Sema::ActOnFinishFullStmt(Stmt *FullStmt) { 3946 if (!FullStmt) return StmtError(); 3947 3948 return MaybeCreateStmtWithCleanups(FullStmt); 3949} 3950