SemaDeclCXX.cpp revision b9abd87283ac6e929b7e12a577663bc99e61d020
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 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++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/Sema/ScopeInfo.h" 20#include "clang/AST/ASTConsumer.h" 21#include "clang/AST/ASTContext.h" 22#include "clang/AST/ASTMutationListener.h" 23#include "clang/AST/CharUnits.h" 24#include "clang/AST/CXXInheritance.h" 25#include "clang/AST/DeclVisitor.h" 26#include "clang/AST/ExprCXX.h" 27#include "clang/AST/RecordLayout.h" 28#include "clang/AST/StmtVisitor.h" 29#include "clang/AST/TypeLoc.h" 30#include "clang/AST/TypeOrdering.h" 31#include "clang/Sema/DeclSpec.h" 32#include "clang/Sema/ParsedTemplate.h" 33#include "clang/Basic/PartialDiagnostic.h" 34#include "clang/Lex/Preprocessor.h" 35#include "llvm/ADT/SmallString.h" 36#include "llvm/ADT/STLExtras.h" 37#include <map> 38#include <set> 39 40using namespace clang; 41 42//===----------------------------------------------------------------------===// 43// CheckDefaultArgumentVisitor 44//===----------------------------------------------------------------------===// 45 46namespace { 47 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 48 /// the default argument of a parameter to determine whether it 49 /// contains any ill-formed subexpressions. For example, this will 50 /// diagnose the use of local variables or parameters within the 51 /// default argument expression. 52 class CheckDefaultArgumentVisitor 53 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 54 Expr *DefaultArg; 55 Sema *S; 56 57 public: 58 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 59 : DefaultArg(defarg), S(s) {} 60 61 bool VisitExpr(Expr *Node); 62 bool VisitDeclRefExpr(DeclRefExpr *DRE); 63 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 64 bool VisitLambdaExpr(LambdaExpr *Lambda); 65 }; 66 67 /// VisitExpr - Visit all of the children of this expression. 68 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 69 bool IsInvalid = false; 70 for (Stmt::child_range I = Node->children(); I; ++I) 71 IsInvalid |= Visit(*I); 72 return IsInvalid; 73 } 74 75 /// VisitDeclRefExpr - Visit a reference to a declaration, to 76 /// determine whether this declaration can be used in the default 77 /// argument expression. 78 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 79 NamedDecl *Decl = DRE->getDecl(); 80 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 81 // C++ [dcl.fct.default]p9 82 // Default arguments are evaluated each time the function is 83 // called. The order of evaluation of function arguments is 84 // unspecified. Consequently, parameters of a function shall not 85 // be used in default argument expressions, even if they are not 86 // evaluated. Parameters of a function declared before a default 87 // argument expression are in scope and can hide namespace and 88 // class member names. 89 return S->Diag(DRE->getLocStart(), 90 diag::err_param_default_argument_references_param) 91 << Param->getDeclName() << DefaultArg->getSourceRange(); 92 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 93 // C++ [dcl.fct.default]p7 94 // Local variables shall not be used in default argument 95 // expressions. 96 if (VDecl->isLocalVarDecl()) 97 return S->Diag(DRE->getLocStart(), 98 diag::err_param_default_argument_references_local) 99 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 100 } 101 102 return false; 103 } 104 105 /// VisitCXXThisExpr - Visit a C++ "this" expression. 106 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 107 // C++ [dcl.fct.default]p8: 108 // The keyword this shall not be used in a default argument of a 109 // member function. 110 return S->Diag(ThisE->getLocStart(), 111 diag::err_param_default_argument_references_this) 112 << ThisE->getSourceRange(); 113 } 114 115 bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) { 116 // C++11 [expr.lambda.prim]p13: 117 // A lambda-expression appearing in a default argument shall not 118 // implicitly or explicitly capture any entity. 119 if (Lambda->capture_begin() == Lambda->capture_end()) 120 return false; 121 122 return S->Diag(Lambda->getLocStart(), 123 diag::err_lambda_capture_default_arg); 124 } 125} 126 127void Sema::ImplicitExceptionSpecification::CalledDecl(CXXMethodDecl *Method) { 128 assert(Context && "ImplicitExceptionSpecification without an ASTContext"); 129 // If we have an MSAny or unknown spec already, don't bother. 130 if (!Method || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 131 return; 132 133 const FunctionProtoType *Proto 134 = Method->getType()->getAs<FunctionProtoType>(); 135 136 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 137 138 // If this function can throw any exceptions, make a note of that. 139 if (EST == EST_Delayed || EST == EST_MSAny || EST == EST_None) { 140 ClearExceptions(); 141 ComputedEST = EST; 142 return; 143 } 144 145 // FIXME: If the call to this decl is using any of its default arguments, we 146 // need to search them for potentially-throwing calls. 147 148 // If this function has a basic noexcept, it doesn't affect the outcome. 149 if (EST == EST_BasicNoexcept) 150 return; 151 152 // If we have a throw-all spec at this point, ignore the function. 153 if (ComputedEST == EST_None) 154 return; 155 156 // If we're still at noexcept(true) and there's a nothrow() callee, 157 // change to that specification. 158 if (EST == EST_DynamicNone) { 159 if (ComputedEST == EST_BasicNoexcept) 160 ComputedEST = EST_DynamicNone; 161 return; 162 } 163 164 // Check out noexcept specs. 165 if (EST == EST_ComputedNoexcept) { 166 FunctionProtoType::NoexceptResult NR = Proto->getNoexceptSpec(*Context); 167 assert(NR != FunctionProtoType::NR_NoNoexcept && 168 "Must have noexcept result for EST_ComputedNoexcept."); 169 assert(NR != FunctionProtoType::NR_Dependent && 170 "Should not generate implicit declarations for dependent cases, " 171 "and don't know how to handle them anyway."); 172 173 // noexcept(false) -> no spec on the new function 174 if (NR == FunctionProtoType::NR_Throw) { 175 ClearExceptions(); 176 ComputedEST = EST_None; 177 } 178 // noexcept(true) won't change anything either. 179 return; 180 } 181 182 assert(EST == EST_Dynamic && "EST case not considered earlier."); 183 assert(ComputedEST != EST_None && 184 "Shouldn't collect exceptions when throw-all is guaranteed."); 185 ComputedEST = EST_Dynamic; 186 // Record the exceptions in this function's exception specification. 187 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 188 EEnd = Proto->exception_end(); 189 E != EEnd; ++E) 190 if (ExceptionsSeen.insert(Context->getCanonicalType(*E))) 191 Exceptions.push_back(*E); 192} 193 194void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 195 if (!E || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 196 return; 197 198 // FIXME: 199 // 200 // C++0x [except.spec]p14: 201 // [An] implicit exception-specification specifies the type-id T if and 202 // only if T is allowed by the exception-specification of a function directly 203 // invoked by f's implicit definition; f shall allow all exceptions if any 204 // function it directly invokes allows all exceptions, and f shall allow no 205 // exceptions if every function it directly invokes allows no exceptions. 206 // 207 // Note in particular that if an implicit exception-specification is generated 208 // for a function containing a throw-expression, that specification can still 209 // be noexcept(true). 210 // 211 // Note also that 'directly invoked' is not defined in the standard, and there 212 // is no indication that we should only consider potentially-evaluated calls. 213 // 214 // Ultimately we should implement the intent of the standard: the exception 215 // specification should be the set of exceptions which can be thrown by the 216 // implicit definition. For now, we assume that any non-nothrow expression can 217 // throw any exception. 218 219 if (E->CanThrow(*Context)) 220 ComputedEST = EST_None; 221} 222 223bool 224Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 225 SourceLocation EqualLoc) { 226 if (RequireCompleteType(Param->getLocation(), Param->getType(), 227 diag::err_typecheck_decl_incomplete_type)) { 228 Param->setInvalidDecl(); 229 return true; 230 } 231 232 // C++ [dcl.fct.default]p5 233 // A default argument expression is implicitly converted (clause 234 // 4) to the parameter type. The default argument expression has 235 // the same semantic constraints as the initializer expression in 236 // a declaration of a variable of the parameter type, using the 237 // copy-initialization semantics (8.5). 238 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 239 Param); 240 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 241 EqualLoc); 242 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 243 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 244 MultiExprArg(*this, &Arg, 1)); 245 if (Result.isInvalid()) 246 return true; 247 Arg = Result.takeAs<Expr>(); 248 249 CheckImplicitConversions(Arg, EqualLoc); 250 Arg = MaybeCreateExprWithCleanups(Arg); 251 252 // Okay: add the default argument to the parameter 253 Param->setDefaultArg(Arg); 254 255 // We have already instantiated this parameter; provide each of the 256 // instantiations with the uninstantiated default argument. 257 UnparsedDefaultArgInstantiationsMap::iterator InstPos 258 = UnparsedDefaultArgInstantiations.find(Param); 259 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 260 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 261 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 262 263 // We're done tracking this parameter's instantiations. 264 UnparsedDefaultArgInstantiations.erase(InstPos); 265 } 266 267 return false; 268} 269 270/// ActOnParamDefaultArgument - Check whether the default argument 271/// provided for a function parameter is well-formed. If so, attach it 272/// to the parameter declaration. 273void 274Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 275 Expr *DefaultArg) { 276 if (!param || !DefaultArg) 277 return; 278 279 ParmVarDecl *Param = cast<ParmVarDecl>(param); 280 UnparsedDefaultArgLocs.erase(Param); 281 282 // Default arguments are only permitted in C++ 283 if (!getLangOpts().CPlusPlus) { 284 Diag(EqualLoc, diag::err_param_default_argument) 285 << DefaultArg->getSourceRange(); 286 Param->setInvalidDecl(); 287 return; 288 } 289 290 // Check for unexpanded parameter packs. 291 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 292 Param->setInvalidDecl(); 293 return; 294 } 295 296 // Check that the default argument is well-formed 297 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 298 if (DefaultArgChecker.Visit(DefaultArg)) { 299 Param->setInvalidDecl(); 300 return; 301 } 302 303 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 304} 305 306/// ActOnParamUnparsedDefaultArgument - We've seen a default 307/// argument for a function parameter, but we can't parse it yet 308/// because we're inside a class definition. Note that this default 309/// argument will be parsed later. 310void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 311 SourceLocation EqualLoc, 312 SourceLocation ArgLoc) { 313 if (!param) 314 return; 315 316 ParmVarDecl *Param = cast<ParmVarDecl>(param); 317 if (Param) 318 Param->setUnparsedDefaultArg(); 319 320 UnparsedDefaultArgLocs[Param] = ArgLoc; 321} 322 323/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 324/// the default argument for the parameter param failed. 325void Sema::ActOnParamDefaultArgumentError(Decl *param) { 326 if (!param) 327 return; 328 329 ParmVarDecl *Param = cast<ParmVarDecl>(param); 330 331 Param->setInvalidDecl(); 332 333 UnparsedDefaultArgLocs.erase(Param); 334} 335 336/// CheckExtraCXXDefaultArguments - Check for any extra default 337/// arguments in the declarator, which is not a function declaration 338/// or definition and therefore is not permitted to have default 339/// arguments. This routine should be invoked for every declarator 340/// that is not a function declaration or definition. 341void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 342 // C++ [dcl.fct.default]p3 343 // A default argument expression shall be specified only in the 344 // parameter-declaration-clause of a function declaration or in a 345 // template-parameter (14.1). It shall not be specified for a 346 // parameter pack. If it is specified in a 347 // parameter-declaration-clause, it shall not occur within a 348 // declarator or abstract-declarator of a parameter-declaration. 349 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 350 DeclaratorChunk &chunk = D.getTypeObject(i); 351 if (chunk.Kind == DeclaratorChunk::Function) { 352 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 353 ParmVarDecl *Param = 354 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 355 if (Param->hasUnparsedDefaultArg()) { 356 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 357 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 358 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 359 delete Toks; 360 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 361 } else if (Param->getDefaultArg()) { 362 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 363 << Param->getDefaultArg()->getSourceRange(); 364 Param->setDefaultArg(0); 365 } 366 } 367 } 368 } 369} 370 371// MergeCXXFunctionDecl - Merge two declarations of the same C++ 372// function, once we already know that they have the same 373// type. Subroutine of MergeFunctionDecl. Returns true if there was an 374// error, false otherwise. 375bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old, 376 Scope *S) { 377 bool Invalid = false; 378 379 // C++ [dcl.fct.default]p4: 380 // For non-template functions, default arguments can be added in 381 // later declarations of a function in the same 382 // scope. Declarations in different scopes have completely 383 // distinct sets of default arguments. That is, declarations in 384 // inner scopes do not acquire default arguments from 385 // declarations in outer scopes, and vice versa. In a given 386 // function declaration, all parameters subsequent to a 387 // parameter with a default argument shall have default 388 // arguments supplied in this or previous declarations. A 389 // default argument shall not be redefined by a later 390 // declaration (not even to the same value). 391 // 392 // C++ [dcl.fct.default]p6: 393 // Except for member functions of class templates, the default arguments 394 // in a member function definition that appears outside of the class 395 // definition are added to the set of default arguments provided by the 396 // member function declaration in the class definition. 397 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 398 ParmVarDecl *OldParam = Old->getParamDecl(p); 399 ParmVarDecl *NewParam = New->getParamDecl(p); 400 401 bool OldParamHasDfl = OldParam->hasDefaultArg(); 402 bool NewParamHasDfl = NewParam->hasDefaultArg(); 403 404 NamedDecl *ND = Old; 405 if (S && !isDeclInScope(ND, New->getDeclContext(), S)) 406 // Ignore default parameters of old decl if they are not in 407 // the same scope. 408 OldParamHasDfl = false; 409 410 if (OldParamHasDfl && NewParamHasDfl) { 411 412 unsigned DiagDefaultParamID = 413 diag::err_param_default_argument_redefinition; 414 415 // MSVC accepts that default parameters be redefined for member functions 416 // of template class. The new default parameter's value is ignored. 417 Invalid = true; 418 if (getLangOpts().MicrosoftExt) { 419 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 420 if (MD && MD->getParent()->getDescribedClassTemplate()) { 421 // Merge the old default argument into the new parameter. 422 NewParam->setHasInheritedDefaultArg(); 423 if (OldParam->hasUninstantiatedDefaultArg()) 424 NewParam->setUninstantiatedDefaultArg( 425 OldParam->getUninstantiatedDefaultArg()); 426 else 427 NewParam->setDefaultArg(OldParam->getInit()); 428 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 429 Invalid = false; 430 } 431 } 432 433 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 434 // hint here. Alternatively, we could walk the type-source information 435 // for NewParam to find the last source location in the type... but it 436 // isn't worth the effort right now. This is the kind of test case that 437 // is hard to get right: 438 // int f(int); 439 // void g(int (*fp)(int) = f); 440 // void g(int (*fp)(int) = &f); 441 Diag(NewParam->getLocation(), DiagDefaultParamID) 442 << NewParam->getDefaultArgRange(); 443 444 // Look for the function declaration where the default argument was 445 // actually written, which may be a declaration prior to Old. 446 for (FunctionDecl *Older = Old->getPreviousDecl(); 447 Older; Older = Older->getPreviousDecl()) { 448 if (!Older->getParamDecl(p)->hasDefaultArg()) 449 break; 450 451 OldParam = Older->getParamDecl(p); 452 } 453 454 Diag(OldParam->getLocation(), diag::note_previous_definition) 455 << OldParam->getDefaultArgRange(); 456 } else if (OldParamHasDfl) { 457 // Merge the old default argument into the new parameter. 458 // It's important to use getInit() here; getDefaultArg() 459 // strips off any top-level ExprWithCleanups. 460 NewParam->setHasInheritedDefaultArg(); 461 if (OldParam->hasUninstantiatedDefaultArg()) 462 NewParam->setUninstantiatedDefaultArg( 463 OldParam->getUninstantiatedDefaultArg()); 464 else 465 NewParam->setDefaultArg(OldParam->getInit()); 466 } else if (NewParamHasDfl) { 467 if (New->getDescribedFunctionTemplate()) { 468 // Paragraph 4, quoted above, only applies to non-template functions. 469 Diag(NewParam->getLocation(), 470 diag::err_param_default_argument_template_redecl) 471 << NewParam->getDefaultArgRange(); 472 Diag(Old->getLocation(), diag::note_template_prev_declaration) 473 << false; 474 } else if (New->getTemplateSpecializationKind() 475 != TSK_ImplicitInstantiation && 476 New->getTemplateSpecializationKind() != TSK_Undeclared) { 477 // C++ [temp.expr.spec]p21: 478 // Default function arguments shall not be specified in a declaration 479 // or a definition for one of the following explicit specializations: 480 // - the explicit specialization of a function template; 481 // - the explicit specialization of a member function template; 482 // - the explicit specialization of a member function of a class 483 // template where the class template specialization to which the 484 // member function specialization belongs is implicitly 485 // instantiated. 486 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 487 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 488 << New->getDeclName() 489 << NewParam->getDefaultArgRange(); 490 } else if (New->getDeclContext()->isDependentContext()) { 491 // C++ [dcl.fct.default]p6 (DR217): 492 // Default arguments for a member function of a class template shall 493 // be specified on the initial declaration of the member function 494 // within the class template. 495 // 496 // Reading the tea leaves a bit in DR217 and its reference to DR205 497 // leads me to the conclusion that one cannot add default function 498 // arguments for an out-of-line definition of a member function of a 499 // dependent type. 500 int WhichKind = 2; 501 if (CXXRecordDecl *Record 502 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 503 if (Record->getDescribedClassTemplate()) 504 WhichKind = 0; 505 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 506 WhichKind = 1; 507 else 508 WhichKind = 2; 509 } 510 511 Diag(NewParam->getLocation(), 512 diag::err_param_default_argument_member_template_redecl) 513 << WhichKind 514 << NewParam->getDefaultArgRange(); 515 } else if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(New)) { 516 CXXSpecialMember NewSM = getSpecialMember(Ctor), 517 OldSM = getSpecialMember(cast<CXXConstructorDecl>(Old)); 518 if (NewSM != OldSM) { 519 Diag(NewParam->getLocation(),diag::warn_default_arg_makes_ctor_special) 520 << NewParam->getDefaultArgRange() << NewSM; 521 Diag(Old->getLocation(), diag::note_previous_declaration_special) 522 << OldSM; 523 } 524 } 525 } 526 } 527 528 // C++11 [dcl.constexpr]p1: If any declaration of a function or function 529 // template has a constexpr specifier then all its declarations shall 530 // contain the constexpr specifier. 531 if (New->isConstexpr() != Old->isConstexpr()) { 532 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 533 << New << New->isConstexpr(); 534 Diag(Old->getLocation(), diag::note_previous_declaration); 535 Invalid = true; 536 } 537 538 if (CheckEquivalentExceptionSpec(Old, New)) 539 Invalid = true; 540 541 return Invalid; 542} 543 544/// \brief Merge the exception specifications of two variable declarations. 545/// 546/// This is called when there's a redeclaration of a VarDecl. The function 547/// checks if the redeclaration might have an exception specification and 548/// validates compatibility and merges the specs if necessary. 549void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 550 // Shortcut if exceptions are disabled. 551 if (!getLangOpts().CXXExceptions) 552 return; 553 554 assert(Context.hasSameType(New->getType(), Old->getType()) && 555 "Should only be called if types are otherwise the same."); 556 557 QualType NewType = New->getType(); 558 QualType OldType = Old->getType(); 559 560 // We're only interested in pointers and references to functions, as well 561 // as pointers to member functions. 562 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 563 NewType = R->getPointeeType(); 564 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 565 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 566 NewType = P->getPointeeType(); 567 OldType = OldType->getAs<PointerType>()->getPointeeType(); 568 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 569 NewType = M->getPointeeType(); 570 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 571 } 572 573 if (!NewType->isFunctionProtoType()) 574 return; 575 576 // There's lots of special cases for functions. For function pointers, system 577 // libraries are hopefully not as broken so that we don't need these 578 // workarounds. 579 if (CheckEquivalentExceptionSpec( 580 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 581 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 582 New->setInvalidDecl(); 583 } 584} 585 586/// CheckCXXDefaultArguments - Verify that the default arguments for a 587/// function declaration are well-formed according to C++ 588/// [dcl.fct.default]. 589void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 590 unsigned NumParams = FD->getNumParams(); 591 unsigned p; 592 593 bool IsLambda = FD->getOverloadedOperator() == OO_Call && 594 isa<CXXMethodDecl>(FD) && 595 cast<CXXMethodDecl>(FD)->getParent()->isLambda(); 596 597 // Find first parameter with a default argument 598 for (p = 0; p < NumParams; ++p) { 599 ParmVarDecl *Param = FD->getParamDecl(p); 600 if (Param->hasDefaultArg()) { 601 // C++11 [expr.prim.lambda]p5: 602 // [...] Default arguments (8.3.6) shall not be specified in the 603 // parameter-declaration-clause of a lambda-declarator. 604 // 605 // FIXME: Core issue 974 strikes this sentence, we only provide an 606 // extension warning. 607 if (IsLambda) 608 Diag(Param->getLocation(), diag::ext_lambda_default_arguments) 609 << Param->getDefaultArgRange(); 610 break; 611 } 612 } 613 614 // C++ [dcl.fct.default]p4: 615 // In a given function declaration, all parameters 616 // subsequent to a parameter with a default argument shall 617 // have default arguments supplied in this or previous 618 // declarations. A default argument shall not be redefined 619 // by a later declaration (not even to the same value). 620 unsigned LastMissingDefaultArg = 0; 621 for (; p < NumParams; ++p) { 622 ParmVarDecl *Param = FD->getParamDecl(p); 623 if (!Param->hasDefaultArg()) { 624 if (Param->isInvalidDecl()) 625 /* We already complained about this parameter. */; 626 else if (Param->getIdentifier()) 627 Diag(Param->getLocation(), 628 diag::err_param_default_argument_missing_name) 629 << Param->getIdentifier(); 630 else 631 Diag(Param->getLocation(), 632 diag::err_param_default_argument_missing); 633 634 LastMissingDefaultArg = p; 635 } 636 } 637 638 if (LastMissingDefaultArg > 0) { 639 // Some default arguments were missing. Clear out all of the 640 // default arguments up to (and including) the last missing 641 // default argument, so that we leave the function parameters 642 // in a semantically valid state. 643 for (p = 0; p <= LastMissingDefaultArg; ++p) { 644 ParmVarDecl *Param = FD->getParamDecl(p); 645 if (Param->hasDefaultArg()) { 646 Param->setDefaultArg(0); 647 } 648 } 649 } 650} 651 652// CheckConstexprParameterTypes - Check whether a function's parameter types 653// are all literal types. If so, return true. If not, produce a suitable 654// diagnostic and return false. 655static bool CheckConstexprParameterTypes(Sema &SemaRef, 656 const FunctionDecl *FD) { 657 unsigned ArgIndex = 0; 658 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 659 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 660 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 661 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 662 SourceLocation ParamLoc = PD->getLocation(); 663 if (!(*i)->isDependentType() && 664 SemaRef.RequireLiteralType(ParamLoc, *i, 665 SemaRef.PDiag(diag::err_constexpr_non_literal_param) 666 << ArgIndex+1 << PD->getSourceRange() 667 << isa<CXXConstructorDecl>(FD))) 668 return false; 669 } 670 return true; 671} 672 673// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 674// the requirements of a constexpr function definition or a constexpr 675// constructor definition. If so, return true. If not, produce appropriate 676// diagnostics and return false. 677// 678// This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. 679bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) { 680 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 681 if (MD && MD->isInstance()) { 682 // C++11 [dcl.constexpr]p4: 683 // The definition of a constexpr constructor shall satisfy the following 684 // constraints: 685 // - the class shall not have any virtual base classes; 686 const CXXRecordDecl *RD = MD->getParent(); 687 if (RD->getNumVBases()) { 688 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) 689 << isa<CXXConstructorDecl>(NewFD) << RD->isStruct() 690 << RD->getNumVBases(); 691 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 692 E = RD->vbases_end(); I != E; ++I) 693 Diag(I->getLocStart(), 694 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 695 return false; 696 } 697 } 698 699 if (!isa<CXXConstructorDecl>(NewFD)) { 700 // C++11 [dcl.constexpr]p3: 701 // The definition of a constexpr function shall satisfy the following 702 // constraints: 703 // - it shall not be virtual; 704 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 705 if (Method && Method->isVirtual()) { 706 Diag(NewFD->getLocation(), diag::err_constexpr_virtual); 707 708 // If it's not obvious why this function is virtual, find an overridden 709 // function which uses the 'virtual' keyword. 710 const CXXMethodDecl *WrittenVirtual = Method; 711 while (!WrittenVirtual->isVirtualAsWritten()) 712 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 713 if (WrittenVirtual != Method) 714 Diag(WrittenVirtual->getLocation(), 715 diag::note_overridden_virtual_function); 716 return false; 717 } 718 719 // - its return type shall be a literal type; 720 QualType RT = NewFD->getResultType(); 721 if (!RT->isDependentType() && 722 RequireLiteralType(NewFD->getLocation(), RT, 723 PDiag(diag::err_constexpr_non_literal_return))) 724 return false; 725 } 726 727 // - each of its parameter types shall be a literal type; 728 if (!CheckConstexprParameterTypes(*this, NewFD)) 729 return false; 730 731 return true; 732} 733 734/// Check the given declaration statement is legal within a constexpr function 735/// body. C++0x [dcl.constexpr]p3,p4. 736/// 737/// \return true if the body is OK, false if we have diagnosed a problem. 738static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 739 DeclStmt *DS) { 740 // C++0x [dcl.constexpr]p3 and p4: 741 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 742 // contain only 743 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 744 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 745 switch ((*DclIt)->getKind()) { 746 case Decl::StaticAssert: 747 case Decl::Using: 748 case Decl::UsingShadow: 749 case Decl::UsingDirective: 750 case Decl::UnresolvedUsingTypename: 751 // - static_assert-declarations 752 // - using-declarations, 753 // - using-directives, 754 continue; 755 756 case Decl::Typedef: 757 case Decl::TypeAlias: { 758 // - typedef declarations and alias-declarations that do not define 759 // classes or enumerations, 760 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 761 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 762 // Don't allow variably-modified types in constexpr functions. 763 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 764 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 765 << TL.getSourceRange() << TL.getType() 766 << isa<CXXConstructorDecl>(Dcl); 767 return false; 768 } 769 continue; 770 } 771 772 case Decl::Enum: 773 case Decl::CXXRecord: 774 // As an extension, we allow the declaration (but not the definition) of 775 // classes and enumerations in all declarations, not just in typedef and 776 // alias declarations. 777 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 778 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 779 << isa<CXXConstructorDecl>(Dcl); 780 return false; 781 } 782 continue; 783 784 case Decl::Var: 785 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 786 << isa<CXXConstructorDecl>(Dcl); 787 return false; 788 789 default: 790 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 791 << isa<CXXConstructorDecl>(Dcl); 792 return false; 793 } 794 } 795 796 return true; 797} 798 799/// Check that the given field is initialized within a constexpr constructor. 800/// 801/// \param Dcl The constexpr constructor being checked. 802/// \param Field The field being checked. This may be a member of an anonymous 803/// struct or union nested within the class being checked. 804/// \param Inits All declarations, including anonymous struct/union members and 805/// indirect members, for which any initialization was provided. 806/// \param Diagnosed Set to true if an error is produced. 807static void CheckConstexprCtorInitializer(Sema &SemaRef, 808 const FunctionDecl *Dcl, 809 FieldDecl *Field, 810 llvm::SmallSet<Decl*, 16> &Inits, 811 bool &Diagnosed) { 812 if (Field->isUnnamedBitfield()) 813 return; 814 815 if (Field->isAnonymousStructOrUnion() && 816 Field->getType()->getAsCXXRecordDecl()->isEmpty()) 817 return; 818 819 if (!Inits.count(Field)) { 820 if (!Diagnosed) { 821 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 822 Diagnosed = true; 823 } 824 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 825 } else if (Field->isAnonymousStructOrUnion()) { 826 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 827 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 828 I != E; ++I) 829 // If an anonymous union contains an anonymous struct of which any member 830 // is initialized, all members must be initialized. 831 if (!RD->isUnion() || Inits.count(*I)) 832 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 833 } 834} 835 836/// Check the body for the given constexpr function declaration only contains 837/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 838/// 839/// \return true if the body is OK, false if we have diagnosed a problem. 840bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 841 if (isa<CXXTryStmt>(Body)) { 842 // C++11 [dcl.constexpr]p3: 843 // The definition of a constexpr function shall satisfy the following 844 // constraints: [...] 845 // - its function-body shall be = delete, = default, or a 846 // compound-statement 847 // 848 // C++11 [dcl.constexpr]p4: 849 // In the definition of a constexpr constructor, [...] 850 // - its function-body shall not be a function-try-block; 851 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 852 << isa<CXXConstructorDecl>(Dcl); 853 return false; 854 } 855 856 // - its function-body shall be [...] a compound-statement that contains only 857 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 858 859 llvm::SmallVector<SourceLocation, 4> ReturnStmts; 860 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 861 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 862 switch ((*BodyIt)->getStmtClass()) { 863 case Stmt::NullStmtClass: 864 // - null statements, 865 continue; 866 867 case Stmt::DeclStmtClass: 868 // - static_assert-declarations 869 // - using-declarations, 870 // - using-directives, 871 // - typedef declarations and alias-declarations that do not define 872 // classes or enumerations, 873 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 874 return false; 875 continue; 876 877 case Stmt::ReturnStmtClass: 878 // - and exactly one return statement; 879 if (isa<CXXConstructorDecl>(Dcl)) 880 break; 881 882 ReturnStmts.push_back((*BodyIt)->getLocStart()); 883 continue; 884 885 default: 886 break; 887 } 888 889 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 890 << isa<CXXConstructorDecl>(Dcl); 891 return false; 892 } 893 894 if (const CXXConstructorDecl *Constructor 895 = dyn_cast<CXXConstructorDecl>(Dcl)) { 896 const CXXRecordDecl *RD = Constructor->getParent(); 897 // DR1359: 898 // - every non-variant non-static data member and base class sub-object 899 // shall be initialized; 900 // - if the class is a non-empty union, or for each non-empty anonymous 901 // union member of a non-union class, exactly one non-static data member 902 // shall be initialized; 903 if (RD->isUnion()) { 904 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) { 905 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 906 return false; 907 } 908 } else if (!Constructor->isDependentContext() && 909 !Constructor->isDelegatingConstructor()) { 910 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 911 912 // Skip detailed checking if we have enough initializers, and we would 913 // allow at most one initializer per member. 914 bool AnyAnonStructUnionMembers = false; 915 unsigned Fields = 0; 916 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 917 E = RD->field_end(); I != E; ++I, ++Fields) { 918 if ((*I)->isAnonymousStructOrUnion()) { 919 AnyAnonStructUnionMembers = true; 920 break; 921 } 922 } 923 if (AnyAnonStructUnionMembers || 924 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 925 // Check initialization of non-static data members. Base classes are 926 // always initialized so do not need to be checked. Dependent bases 927 // might not have initializers in the member initializer list. 928 llvm::SmallSet<Decl*, 16> Inits; 929 for (CXXConstructorDecl::init_const_iterator 930 I = Constructor->init_begin(), E = Constructor->init_end(); 931 I != E; ++I) { 932 if (FieldDecl *FD = (*I)->getMember()) 933 Inits.insert(FD); 934 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 935 Inits.insert(ID->chain_begin(), ID->chain_end()); 936 } 937 938 bool Diagnosed = false; 939 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 940 E = RD->field_end(); I != E; ++I) 941 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 942 if (Diagnosed) 943 return false; 944 } 945 } 946 } else { 947 if (ReturnStmts.empty()) { 948 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 949 return false; 950 } 951 if (ReturnStmts.size() > 1) { 952 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 953 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 954 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 955 return false; 956 } 957 } 958 959 // C++11 [dcl.constexpr]p5: 960 // if no function argument values exist such that the function invocation 961 // substitution would produce a constant expression, the program is 962 // ill-formed; no diagnostic required. 963 // C++11 [dcl.constexpr]p3: 964 // - every constructor call and implicit conversion used in initializing the 965 // return value shall be one of those allowed in a constant expression. 966 // C++11 [dcl.constexpr]p4: 967 // - every constructor involved in initializing non-static data members and 968 // base class sub-objects shall be a constexpr constructor. 969 llvm::SmallVector<PartialDiagnosticAt, 8> Diags; 970 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) { 971 Diag(Dcl->getLocation(), diag::err_constexpr_function_never_constant_expr) 972 << isa<CXXConstructorDecl>(Dcl); 973 for (size_t I = 0, N = Diags.size(); I != N; ++I) 974 Diag(Diags[I].first, Diags[I].second); 975 return false; 976 } 977 978 return true; 979} 980 981/// isCurrentClassName - Determine whether the identifier II is the 982/// name of the class type currently being defined. In the case of 983/// nested classes, this will only return true if II is the name of 984/// the innermost class. 985bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 986 const CXXScopeSpec *SS) { 987 assert(getLangOpts().CPlusPlus && "No class names in C!"); 988 989 CXXRecordDecl *CurDecl; 990 if (SS && SS->isSet() && !SS->isInvalid()) { 991 DeclContext *DC = computeDeclContext(*SS, true); 992 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 993 } else 994 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 995 996 if (CurDecl && CurDecl->getIdentifier()) 997 return &II == CurDecl->getIdentifier(); 998 else 999 return false; 1000} 1001 1002/// \brief Check the validity of a C++ base class specifier. 1003/// 1004/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1005/// and returns NULL otherwise. 1006CXXBaseSpecifier * 1007Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1008 SourceRange SpecifierRange, 1009 bool Virtual, AccessSpecifier Access, 1010 TypeSourceInfo *TInfo, 1011 SourceLocation EllipsisLoc) { 1012 QualType BaseType = TInfo->getType(); 1013 1014 // C++ [class.union]p1: 1015 // A union shall not have base classes. 1016 if (Class->isUnion()) { 1017 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1018 << SpecifierRange; 1019 return 0; 1020 } 1021 1022 if (EllipsisLoc.isValid() && 1023 !TInfo->getType()->containsUnexpandedParameterPack()) { 1024 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1025 << TInfo->getTypeLoc().getSourceRange(); 1026 EllipsisLoc = SourceLocation(); 1027 } 1028 1029 if (BaseType->isDependentType()) 1030 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1031 Class->getTagKind() == TTK_Class, 1032 Access, TInfo, EllipsisLoc); 1033 1034 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1035 1036 // Base specifiers must be record types. 1037 if (!BaseType->isRecordType()) { 1038 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1039 return 0; 1040 } 1041 1042 // C++ [class.union]p1: 1043 // A union shall not be used as a base class. 1044 if (BaseType->isUnionType()) { 1045 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1046 return 0; 1047 } 1048 1049 // C++ [class.derived]p2: 1050 // The class-name in a base-specifier shall not be an incompletely 1051 // defined class. 1052 if (RequireCompleteType(BaseLoc, BaseType, 1053 PDiag(diag::err_incomplete_base_class) 1054 << SpecifierRange)) { 1055 Class->setInvalidDecl(); 1056 return 0; 1057 } 1058 1059 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1060 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1061 assert(BaseDecl && "Record type has no declaration"); 1062 BaseDecl = BaseDecl->getDefinition(); 1063 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1064 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1065 assert(CXXBaseDecl && "Base type is not a C++ type"); 1066 1067 // C++ [class]p3: 1068 // If a class is marked final and it appears as a base-type-specifier in 1069 // base-clause, the program is ill-formed. 1070 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1071 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1072 << CXXBaseDecl->getDeclName(); 1073 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1074 << CXXBaseDecl->getDeclName(); 1075 return 0; 1076 } 1077 1078 if (BaseDecl->isInvalidDecl()) 1079 Class->setInvalidDecl(); 1080 1081 // Create the base specifier. 1082 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1083 Class->getTagKind() == TTK_Class, 1084 Access, TInfo, EllipsisLoc); 1085} 1086 1087/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1088/// one entry in the base class list of a class specifier, for 1089/// example: 1090/// class foo : public bar, virtual private baz { 1091/// 'public bar' and 'virtual private baz' are each base-specifiers. 1092BaseResult 1093Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1094 bool Virtual, AccessSpecifier Access, 1095 ParsedType basetype, SourceLocation BaseLoc, 1096 SourceLocation EllipsisLoc) { 1097 if (!classdecl) 1098 return true; 1099 1100 AdjustDeclIfTemplate(classdecl); 1101 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1102 if (!Class) 1103 return true; 1104 1105 TypeSourceInfo *TInfo = 0; 1106 GetTypeFromParser(basetype, &TInfo); 1107 1108 if (EllipsisLoc.isInvalid() && 1109 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1110 UPPC_BaseType)) 1111 return true; 1112 1113 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1114 Virtual, Access, TInfo, 1115 EllipsisLoc)) 1116 return BaseSpec; 1117 1118 return true; 1119} 1120 1121/// \brief Performs the actual work of attaching the given base class 1122/// specifiers to a C++ class. 1123bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1124 unsigned NumBases) { 1125 if (NumBases == 0) 1126 return false; 1127 1128 // Used to keep track of which base types we have already seen, so 1129 // that we can properly diagnose redundant direct base types. Note 1130 // that the key is always the unqualified canonical type of the base 1131 // class. 1132 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1133 1134 // Copy non-redundant base specifiers into permanent storage. 1135 unsigned NumGoodBases = 0; 1136 bool Invalid = false; 1137 for (unsigned idx = 0; idx < NumBases; ++idx) { 1138 QualType NewBaseType 1139 = Context.getCanonicalType(Bases[idx]->getType()); 1140 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1141 1142 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; 1143 if (KnownBase) { 1144 // C++ [class.mi]p3: 1145 // A class shall not be specified as a direct base class of a 1146 // derived class more than once. 1147 Diag(Bases[idx]->getLocStart(), 1148 diag::err_duplicate_base_class) 1149 << KnownBase->getType() 1150 << Bases[idx]->getSourceRange(); 1151 1152 // Delete the duplicate base class specifier; we're going to 1153 // overwrite its pointer later. 1154 Context.Deallocate(Bases[idx]); 1155 1156 Invalid = true; 1157 } else { 1158 // Okay, add this new base class. 1159 KnownBase = Bases[idx]; 1160 Bases[NumGoodBases++] = Bases[idx]; 1161 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) 1162 if (const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl())) 1163 if (RD->hasAttr<WeakAttr>()) 1164 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1165 } 1166 } 1167 1168 // Attach the remaining base class specifiers to the derived class. 1169 Class->setBases(Bases, NumGoodBases); 1170 1171 // Delete the remaining (good) base class specifiers, since their 1172 // data has been copied into the CXXRecordDecl. 1173 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1174 Context.Deallocate(Bases[idx]); 1175 1176 return Invalid; 1177} 1178 1179/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1180/// class, after checking whether there are any duplicate base 1181/// classes. 1182void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1183 unsigned NumBases) { 1184 if (!ClassDecl || !Bases || !NumBases) 1185 return; 1186 1187 AdjustDeclIfTemplate(ClassDecl); 1188 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1189 (CXXBaseSpecifier**)(Bases), NumBases); 1190} 1191 1192static CXXRecordDecl *GetClassForType(QualType T) { 1193 if (const RecordType *RT = T->getAs<RecordType>()) 1194 return cast<CXXRecordDecl>(RT->getDecl()); 1195 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1196 return ICT->getDecl(); 1197 else 1198 return 0; 1199} 1200 1201/// \brief Determine whether the type \p Derived is a C++ class that is 1202/// derived from the type \p Base. 1203bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1204 if (!getLangOpts().CPlusPlus) 1205 return false; 1206 1207 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1208 if (!DerivedRD) 1209 return false; 1210 1211 CXXRecordDecl *BaseRD = GetClassForType(Base); 1212 if (!BaseRD) 1213 return false; 1214 1215 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1216 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1217} 1218 1219/// \brief Determine whether the type \p Derived is a C++ class that is 1220/// derived from the type \p Base. 1221bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1222 if (!getLangOpts().CPlusPlus) 1223 return false; 1224 1225 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1226 if (!DerivedRD) 1227 return false; 1228 1229 CXXRecordDecl *BaseRD = GetClassForType(Base); 1230 if (!BaseRD) 1231 return false; 1232 1233 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1234} 1235 1236void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1237 CXXCastPath &BasePathArray) { 1238 assert(BasePathArray.empty() && "Base path array must be empty!"); 1239 assert(Paths.isRecordingPaths() && "Must record paths!"); 1240 1241 const CXXBasePath &Path = Paths.front(); 1242 1243 // We first go backward and check if we have a virtual base. 1244 // FIXME: It would be better if CXXBasePath had the base specifier for 1245 // the nearest virtual base. 1246 unsigned Start = 0; 1247 for (unsigned I = Path.size(); I != 0; --I) { 1248 if (Path[I - 1].Base->isVirtual()) { 1249 Start = I - 1; 1250 break; 1251 } 1252 } 1253 1254 // Now add all bases. 1255 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1256 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1257} 1258 1259/// \brief Determine whether the given base path includes a virtual 1260/// base class. 1261bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1262 for (CXXCastPath::const_iterator B = BasePath.begin(), 1263 BEnd = BasePath.end(); 1264 B != BEnd; ++B) 1265 if ((*B)->isVirtual()) 1266 return true; 1267 1268 return false; 1269} 1270 1271/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1272/// conversion (where Derived and Base are class types) is 1273/// well-formed, meaning that the conversion is unambiguous (and 1274/// that all of the base classes are accessible). Returns true 1275/// and emits a diagnostic if the code is ill-formed, returns false 1276/// otherwise. Loc is the location where this routine should point to 1277/// if there is an error, and Range is the source range to highlight 1278/// if there is an error. 1279bool 1280Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1281 unsigned InaccessibleBaseID, 1282 unsigned AmbigiousBaseConvID, 1283 SourceLocation Loc, SourceRange Range, 1284 DeclarationName Name, 1285 CXXCastPath *BasePath) { 1286 // First, determine whether the path from Derived to Base is 1287 // ambiguous. This is slightly more expensive than checking whether 1288 // the Derived to Base conversion exists, because here we need to 1289 // explore multiple paths to determine if there is an ambiguity. 1290 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1291 /*DetectVirtual=*/false); 1292 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1293 assert(DerivationOkay && 1294 "Can only be used with a derived-to-base conversion"); 1295 (void)DerivationOkay; 1296 1297 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1298 if (InaccessibleBaseID) { 1299 // Check that the base class can be accessed. 1300 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1301 InaccessibleBaseID)) { 1302 case AR_inaccessible: 1303 return true; 1304 case AR_accessible: 1305 case AR_dependent: 1306 case AR_delayed: 1307 break; 1308 } 1309 } 1310 1311 // Build a base path if necessary. 1312 if (BasePath) 1313 BuildBasePathArray(Paths, *BasePath); 1314 return false; 1315 } 1316 1317 // We know that the derived-to-base conversion is ambiguous, and 1318 // we're going to produce a diagnostic. Perform the derived-to-base 1319 // search just one more time to compute all of the possible paths so 1320 // that we can print them out. This is more expensive than any of 1321 // the previous derived-to-base checks we've done, but at this point 1322 // performance isn't as much of an issue. 1323 Paths.clear(); 1324 Paths.setRecordingPaths(true); 1325 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1326 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1327 (void)StillOkay; 1328 1329 // Build up a textual representation of the ambiguous paths, e.g., 1330 // D -> B -> A, that will be used to illustrate the ambiguous 1331 // conversions in the diagnostic. We only print one of the paths 1332 // to each base class subobject. 1333 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1334 1335 Diag(Loc, AmbigiousBaseConvID) 1336 << Derived << Base << PathDisplayStr << Range << Name; 1337 return true; 1338} 1339 1340bool 1341Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1342 SourceLocation Loc, SourceRange Range, 1343 CXXCastPath *BasePath, 1344 bool IgnoreAccess) { 1345 return CheckDerivedToBaseConversion(Derived, Base, 1346 IgnoreAccess ? 0 1347 : diag::err_upcast_to_inaccessible_base, 1348 diag::err_ambiguous_derived_to_base_conv, 1349 Loc, Range, DeclarationName(), 1350 BasePath); 1351} 1352 1353 1354/// @brief Builds a string representing ambiguous paths from a 1355/// specific derived class to different subobjects of the same base 1356/// class. 1357/// 1358/// This function builds a string that can be used in error messages 1359/// to show the different paths that one can take through the 1360/// inheritance hierarchy to go from the derived class to different 1361/// subobjects of a base class. The result looks something like this: 1362/// @code 1363/// struct D -> struct B -> struct A 1364/// struct D -> struct C -> struct A 1365/// @endcode 1366std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1367 std::string PathDisplayStr; 1368 std::set<unsigned> DisplayedPaths; 1369 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1370 Path != Paths.end(); ++Path) { 1371 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1372 // We haven't displayed a path to this particular base 1373 // class subobject yet. 1374 PathDisplayStr += "\n "; 1375 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1376 for (CXXBasePath::const_iterator Element = Path->begin(); 1377 Element != Path->end(); ++Element) 1378 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1379 } 1380 } 1381 1382 return PathDisplayStr; 1383} 1384 1385//===----------------------------------------------------------------------===// 1386// C++ class member Handling 1387//===----------------------------------------------------------------------===// 1388 1389/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1390bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1391 SourceLocation ASLoc, 1392 SourceLocation ColonLoc, 1393 AttributeList *Attrs) { 1394 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1395 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1396 ASLoc, ColonLoc); 1397 CurContext->addHiddenDecl(ASDecl); 1398 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1399} 1400 1401/// CheckOverrideControl - Check C++0x override control semantics. 1402void Sema::CheckOverrideControl(const Decl *D) { 1403 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1404 if (!MD || !MD->isVirtual()) 1405 return; 1406 1407 if (MD->isDependentContext()) 1408 return; 1409 1410 // C++0x [class.virtual]p3: 1411 // If a virtual function is marked with the virt-specifier override and does 1412 // not override a member function of a base class, 1413 // the program is ill-formed. 1414 bool HasOverriddenMethods = 1415 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1416 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1417 Diag(MD->getLocation(), 1418 diag::err_function_marked_override_not_overriding) 1419 << MD->getDeclName(); 1420 return; 1421 } 1422} 1423 1424/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1425/// function overrides a virtual member function marked 'final', according to 1426/// C++0x [class.virtual]p3. 1427bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1428 const CXXMethodDecl *Old) { 1429 if (!Old->hasAttr<FinalAttr>()) 1430 return false; 1431 1432 Diag(New->getLocation(), diag::err_final_function_overridden) 1433 << New->getDeclName(); 1434 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1435 return true; 1436} 1437 1438/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1439/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1440/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1441/// one has been parsed, and 'HasDeferredInit' is true if an initializer is 1442/// present but parsing it has been deferred. 1443Decl * 1444Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1445 MultiTemplateParamsArg TemplateParameterLists, 1446 Expr *BW, const VirtSpecifiers &VS, 1447 bool HasDeferredInit) { 1448 const DeclSpec &DS = D.getDeclSpec(); 1449 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1450 DeclarationName Name = NameInfo.getName(); 1451 SourceLocation Loc = NameInfo.getLoc(); 1452 1453 // For anonymous bitfields, the location should point to the type. 1454 if (Loc.isInvalid()) 1455 Loc = D.getLocStart(); 1456 1457 Expr *BitWidth = static_cast<Expr*>(BW); 1458 1459 assert(isa<CXXRecordDecl>(CurContext)); 1460 assert(!DS.isFriendSpecified()); 1461 1462 bool isFunc = D.isDeclarationOfFunction(); 1463 1464 // C++ 9.2p6: A member shall not be declared to have automatic storage 1465 // duration (auto, register) or with the extern storage-class-specifier. 1466 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1467 // data members and cannot be applied to names declared const or static, 1468 // and cannot be applied to reference members. 1469 switch (DS.getStorageClassSpec()) { 1470 case DeclSpec::SCS_unspecified: 1471 case DeclSpec::SCS_typedef: 1472 case DeclSpec::SCS_static: 1473 // FALL THROUGH. 1474 break; 1475 case DeclSpec::SCS_mutable: 1476 if (isFunc) { 1477 if (DS.getStorageClassSpecLoc().isValid()) 1478 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1479 else 1480 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1481 1482 // FIXME: It would be nicer if the keyword was ignored only for this 1483 // declarator. Otherwise we could get follow-up errors. 1484 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1485 } 1486 break; 1487 default: 1488 if (DS.getStorageClassSpecLoc().isValid()) 1489 Diag(DS.getStorageClassSpecLoc(), 1490 diag::err_storageclass_invalid_for_member); 1491 else 1492 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1493 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1494 } 1495 1496 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1497 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1498 !isFunc); 1499 1500 Decl *Member; 1501 if (isInstField) { 1502 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1503 1504 // Data members must have identifiers for names. 1505 if (Name.getNameKind() != DeclarationName::Identifier) { 1506 Diag(Loc, diag::err_bad_variable_name) 1507 << Name; 1508 return 0; 1509 } 1510 1511 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1512 1513 // Member field could not be with "template" keyword. 1514 // So TemplateParameterLists should be empty in this case. 1515 if (TemplateParameterLists.size()) { 1516 TemplateParameterList* TemplateParams = TemplateParameterLists.get()[0]; 1517 if (TemplateParams->size()) { 1518 // There is no such thing as a member field template. 1519 Diag(D.getIdentifierLoc(), diag::err_template_member) 1520 << II 1521 << SourceRange(TemplateParams->getTemplateLoc(), 1522 TemplateParams->getRAngleLoc()); 1523 } else { 1524 // There is an extraneous 'template<>' for this member. 1525 Diag(TemplateParams->getTemplateLoc(), 1526 diag::err_template_member_noparams) 1527 << II 1528 << SourceRange(TemplateParams->getTemplateLoc(), 1529 TemplateParams->getRAngleLoc()); 1530 } 1531 return 0; 1532 } 1533 1534 if (SS.isSet() && !SS.isInvalid()) { 1535 // The user provided a superfluous scope specifier inside a class 1536 // definition: 1537 // 1538 // class X { 1539 // int X::member; 1540 // }; 1541 if (DeclContext *DC = computeDeclContext(SS, false)) 1542 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc()); 1543 else 1544 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1545 << Name << SS.getRange(); 1546 1547 SS.clear(); 1548 } 1549 1550 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1551 HasDeferredInit, AS); 1552 assert(Member && "HandleField never returns null"); 1553 } else { 1554 assert(!HasDeferredInit); 1555 1556 Member = HandleDeclarator(S, D, move(TemplateParameterLists)); 1557 if (!Member) { 1558 return 0; 1559 } 1560 1561 // Non-instance-fields can't have a bitfield. 1562 if (BitWidth) { 1563 if (Member->isInvalidDecl()) { 1564 // don't emit another diagnostic. 1565 } else if (isa<VarDecl>(Member)) { 1566 // C++ 9.6p3: A bit-field shall not be a static member. 1567 // "static member 'A' cannot be a bit-field" 1568 Diag(Loc, diag::err_static_not_bitfield) 1569 << Name << BitWidth->getSourceRange(); 1570 } else if (isa<TypedefDecl>(Member)) { 1571 // "typedef member 'x' cannot be a bit-field" 1572 Diag(Loc, diag::err_typedef_not_bitfield) 1573 << Name << BitWidth->getSourceRange(); 1574 } else { 1575 // A function typedef ("typedef int f(); f a;"). 1576 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1577 Diag(Loc, diag::err_not_integral_type_bitfield) 1578 << Name << cast<ValueDecl>(Member)->getType() 1579 << BitWidth->getSourceRange(); 1580 } 1581 1582 BitWidth = 0; 1583 Member->setInvalidDecl(); 1584 } 1585 1586 Member->setAccess(AS); 1587 1588 // If we have declared a member function template, set the access of the 1589 // templated declaration as well. 1590 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1591 FunTmpl->getTemplatedDecl()->setAccess(AS); 1592 } 1593 1594 if (VS.isOverrideSpecified()) { 1595 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1596 if (!MD || !MD->isVirtual()) { 1597 Diag(Member->getLocStart(), 1598 diag::override_keyword_only_allowed_on_virtual_member_functions) 1599 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1600 } else 1601 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1602 } 1603 if (VS.isFinalSpecified()) { 1604 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1605 if (!MD || !MD->isVirtual()) { 1606 Diag(Member->getLocStart(), 1607 diag::override_keyword_only_allowed_on_virtual_member_functions) 1608 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1609 } else 1610 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1611 } 1612 1613 if (VS.getLastLocation().isValid()) { 1614 // Update the end location of a method that has a virt-specifiers. 1615 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1616 MD->setRangeEnd(VS.getLastLocation()); 1617 } 1618 1619 CheckOverrideControl(Member); 1620 1621 assert((Name || isInstField) && "No identifier for non-field ?"); 1622 1623 if (isInstField) 1624 FieldCollector->Add(cast<FieldDecl>(Member)); 1625 return Member; 1626} 1627 1628/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1629/// in-class initializer for a non-static C++ class member, and after 1630/// instantiating an in-class initializer in a class template. Such actions 1631/// are deferred until the class is complete. 1632void 1633Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation EqualLoc, 1634 Expr *InitExpr) { 1635 FieldDecl *FD = cast<FieldDecl>(D); 1636 1637 if (!InitExpr) { 1638 FD->setInvalidDecl(); 1639 FD->removeInClassInitializer(); 1640 return; 1641 } 1642 1643 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1644 FD->setInvalidDecl(); 1645 FD->removeInClassInitializer(); 1646 return; 1647 } 1648 1649 ExprResult Init = InitExpr; 1650 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1651 if (isa<InitListExpr>(InitExpr) && isStdInitializerList(FD->getType(), 0)) { 1652 Diag(FD->getLocation(), diag::warn_dangling_std_initializer_list) 1653 << /*at end of ctor*/1 << InitExpr->getSourceRange(); 1654 } 1655 Expr **Inits = &InitExpr; 1656 unsigned NumInits = 1; 1657 InitializedEntity Entity = InitializedEntity::InitializeMember(FD); 1658 InitializationKind Kind = EqualLoc.isInvalid() 1659 ? InitializationKind::CreateDirectList(InitExpr->getLocStart()) 1660 : InitializationKind::CreateCopy(InitExpr->getLocStart(), EqualLoc); 1661 InitializationSequence Seq(*this, Entity, Kind, Inits, NumInits); 1662 Init = Seq.Perform(*this, Entity, Kind, MultiExprArg(Inits, NumInits)); 1663 if (Init.isInvalid()) { 1664 FD->setInvalidDecl(); 1665 return; 1666 } 1667 1668 CheckImplicitConversions(Init.get(), EqualLoc); 1669 } 1670 1671 // C++0x [class.base.init]p7: 1672 // The initialization of each base and member constitutes a 1673 // full-expression. 1674 Init = MaybeCreateExprWithCleanups(Init); 1675 if (Init.isInvalid()) { 1676 FD->setInvalidDecl(); 1677 return; 1678 } 1679 1680 InitExpr = Init.release(); 1681 1682 FD->setInClassInitializer(InitExpr); 1683} 1684 1685/// \brief Find the direct and/or virtual base specifiers that 1686/// correspond to the given base type, for use in base initialization 1687/// within a constructor. 1688static bool FindBaseInitializer(Sema &SemaRef, 1689 CXXRecordDecl *ClassDecl, 1690 QualType BaseType, 1691 const CXXBaseSpecifier *&DirectBaseSpec, 1692 const CXXBaseSpecifier *&VirtualBaseSpec) { 1693 // First, check for a direct base class. 1694 DirectBaseSpec = 0; 1695 for (CXXRecordDecl::base_class_const_iterator Base 1696 = ClassDecl->bases_begin(); 1697 Base != ClassDecl->bases_end(); ++Base) { 1698 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1699 // We found a direct base of this type. That's what we're 1700 // initializing. 1701 DirectBaseSpec = &*Base; 1702 break; 1703 } 1704 } 1705 1706 // Check for a virtual base class. 1707 // FIXME: We might be able to short-circuit this if we know in advance that 1708 // there are no virtual bases. 1709 VirtualBaseSpec = 0; 1710 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1711 // We haven't found a base yet; search the class hierarchy for a 1712 // virtual base class. 1713 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1714 /*DetectVirtual=*/false); 1715 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1716 BaseType, Paths)) { 1717 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1718 Path != Paths.end(); ++Path) { 1719 if (Path->back().Base->isVirtual()) { 1720 VirtualBaseSpec = Path->back().Base; 1721 break; 1722 } 1723 } 1724 } 1725 } 1726 1727 return DirectBaseSpec || VirtualBaseSpec; 1728} 1729 1730/// \brief Handle a C++ member initializer using braced-init-list syntax. 1731MemInitResult 1732Sema::ActOnMemInitializer(Decl *ConstructorD, 1733 Scope *S, 1734 CXXScopeSpec &SS, 1735 IdentifierInfo *MemberOrBase, 1736 ParsedType TemplateTypeTy, 1737 const DeclSpec &DS, 1738 SourceLocation IdLoc, 1739 Expr *InitList, 1740 SourceLocation EllipsisLoc) { 1741 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1742 DS, IdLoc, InitList, 1743 EllipsisLoc); 1744} 1745 1746/// \brief Handle a C++ member initializer using parentheses syntax. 1747MemInitResult 1748Sema::ActOnMemInitializer(Decl *ConstructorD, 1749 Scope *S, 1750 CXXScopeSpec &SS, 1751 IdentifierInfo *MemberOrBase, 1752 ParsedType TemplateTypeTy, 1753 const DeclSpec &DS, 1754 SourceLocation IdLoc, 1755 SourceLocation LParenLoc, 1756 Expr **Args, unsigned NumArgs, 1757 SourceLocation RParenLoc, 1758 SourceLocation EllipsisLoc) { 1759 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1760 RParenLoc); 1761 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1762 DS, IdLoc, List, EllipsisLoc); 1763} 1764 1765namespace { 1766 1767// Callback to only accept typo corrections that can be a valid C++ member 1768// intializer: either a non-static field member or a base class. 1769class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 1770 public: 1771 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 1772 : ClassDecl(ClassDecl) {} 1773 1774 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 1775 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 1776 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 1777 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 1778 else 1779 return isa<TypeDecl>(ND); 1780 } 1781 return false; 1782 } 1783 1784 private: 1785 CXXRecordDecl *ClassDecl; 1786}; 1787 1788} 1789 1790/// \brief Handle a C++ member initializer. 1791MemInitResult 1792Sema::BuildMemInitializer(Decl *ConstructorD, 1793 Scope *S, 1794 CXXScopeSpec &SS, 1795 IdentifierInfo *MemberOrBase, 1796 ParsedType TemplateTypeTy, 1797 const DeclSpec &DS, 1798 SourceLocation IdLoc, 1799 Expr *Init, 1800 SourceLocation EllipsisLoc) { 1801 if (!ConstructorD) 1802 return true; 1803 1804 AdjustDeclIfTemplate(ConstructorD); 1805 1806 CXXConstructorDecl *Constructor 1807 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1808 if (!Constructor) { 1809 // The user wrote a constructor initializer on a function that is 1810 // not a C++ constructor. Ignore the error for now, because we may 1811 // have more member initializers coming; we'll diagnose it just 1812 // once in ActOnMemInitializers. 1813 return true; 1814 } 1815 1816 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1817 1818 // C++ [class.base.init]p2: 1819 // Names in a mem-initializer-id are looked up in the scope of the 1820 // constructor's class and, if not found in that scope, are looked 1821 // up in the scope containing the constructor's definition. 1822 // [Note: if the constructor's class contains a member with the 1823 // same name as a direct or virtual base class of the class, a 1824 // mem-initializer-id naming the member or base class and composed 1825 // of a single identifier refers to the class member. A 1826 // mem-initializer-id for the hidden base class may be specified 1827 // using a qualified name. ] 1828 if (!SS.getScopeRep() && !TemplateTypeTy) { 1829 // Look for a member, first. 1830 DeclContext::lookup_result Result 1831 = ClassDecl->lookup(MemberOrBase); 1832 if (Result.first != Result.second) { 1833 ValueDecl *Member; 1834 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 1835 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 1836 if (EllipsisLoc.isValid()) 1837 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1838 << MemberOrBase 1839 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 1840 1841 return BuildMemberInitializer(Member, Init, IdLoc); 1842 } 1843 } 1844 } 1845 // It didn't name a member, so see if it names a class. 1846 QualType BaseType; 1847 TypeSourceInfo *TInfo = 0; 1848 1849 if (TemplateTypeTy) { 1850 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1851 } else if (DS.getTypeSpecType() == TST_decltype) { 1852 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 1853 } else { 1854 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1855 LookupParsedName(R, S, &SS); 1856 1857 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1858 if (!TyD) { 1859 if (R.isAmbiguous()) return true; 1860 1861 // We don't want access-control diagnostics here. 1862 R.suppressDiagnostics(); 1863 1864 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1865 bool NotUnknownSpecialization = false; 1866 DeclContext *DC = computeDeclContext(SS, false); 1867 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1868 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1869 1870 if (!NotUnknownSpecialization) { 1871 // When the scope specifier can refer to a member of an unknown 1872 // specialization, we take it as a type name. 1873 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1874 SS.getWithLocInContext(Context), 1875 *MemberOrBase, IdLoc); 1876 if (BaseType.isNull()) 1877 return true; 1878 1879 R.clear(); 1880 R.setLookupName(MemberOrBase); 1881 } 1882 } 1883 1884 // If no results were found, try to correct typos. 1885 TypoCorrection Corr; 1886 MemInitializerValidatorCCC Validator(ClassDecl); 1887 if (R.empty() && BaseType.isNull() && 1888 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1889 Validator, ClassDecl))) { 1890 std::string CorrectedStr(Corr.getAsString(getLangOpts())); 1891 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOpts())); 1892 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1893 // We have found a non-static data member with a similar 1894 // name to what was typed; complain and initialize that 1895 // member. 1896 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1897 << MemberOrBase << true << CorrectedQuotedStr 1898 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1899 Diag(Member->getLocation(), diag::note_previous_decl) 1900 << CorrectedQuotedStr; 1901 1902 return BuildMemberInitializer(Member, Init, IdLoc); 1903 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1904 const CXXBaseSpecifier *DirectBaseSpec; 1905 const CXXBaseSpecifier *VirtualBaseSpec; 1906 if (FindBaseInitializer(*this, ClassDecl, 1907 Context.getTypeDeclType(Type), 1908 DirectBaseSpec, VirtualBaseSpec)) { 1909 // We have found a direct or virtual base class with a 1910 // similar name to what was typed; complain and initialize 1911 // that base class. 1912 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1913 << MemberOrBase << false << CorrectedQuotedStr 1914 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1915 1916 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1917 : VirtualBaseSpec; 1918 Diag(BaseSpec->getLocStart(), 1919 diag::note_base_class_specified_here) 1920 << BaseSpec->getType() 1921 << BaseSpec->getSourceRange(); 1922 1923 TyD = Type; 1924 } 1925 } 1926 } 1927 1928 if (!TyD && BaseType.isNull()) { 1929 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1930 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 1931 return true; 1932 } 1933 } 1934 1935 if (BaseType.isNull()) { 1936 BaseType = Context.getTypeDeclType(TyD); 1937 if (SS.isSet()) { 1938 NestedNameSpecifier *Qualifier = 1939 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1940 1941 // FIXME: preserve source range information 1942 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1943 } 1944 } 1945 } 1946 1947 if (!TInfo) 1948 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1949 1950 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 1951} 1952 1953/// Checks a member initializer expression for cases where reference (or 1954/// pointer) members are bound to by-value parameters (or their addresses). 1955static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 1956 Expr *Init, 1957 SourceLocation IdLoc) { 1958 QualType MemberTy = Member->getType(); 1959 1960 // We only handle pointers and references currently. 1961 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 1962 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 1963 return; 1964 1965 const bool IsPointer = MemberTy->isPointerType(); 1966 if (IsPointer) { 1967 if (const UnaryOperator *Op 1968 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 1969 // The only case we're worried about with pointers requires taking the 1970 // address. 1971 if (Op->getOpcode() != UO_AddrOf) 1972 return; 1973 1974 Init = Op->getSubExpr(); 1975 } else { 1976 // We only handle address-of expression initializers for pointers. 1977 return; 1978 } 1979 } 1980 1981 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 1982 // Taking the address of a temporary will be diagnosed as a hard error. 1983 if (IsPointer) 1984 return; 1985 1986 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 1987 << Member << Init->getSourceRange(); 1988 } else if (const DeclRefExpr *DRE 1989 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 1990 // We only warn when referring to a non-reference parameter declaration. 1991 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 1992 if (!Parameter || Parameter->getType()->isReferenceType()) 1993 return; 1994 1995 S.Diag(Init->getExprLoc(), 1996 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 1997 : diag::warn_bind_ref_member_to_parameter) 1998 << Member << Parameter << Init->getSourceRange(); 1999 } else { 2000 // Other initializers are fine. 2001 return; 2002 } 2003 2004 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 2005 << (unsigned)IsPointer; 2006} 2007 2008/// Checks an initializer expression for use of uninitialized fields, such as 2009/// containing the field that is being initialized. Returns true if there is an 2010/// uninitialized field was used an updates the SourceLocation parameter; false 2011/// otherwise. 2012static bool InitExprContainsUninitializedFields(const Stmt *S, 2013 const ValueDecl *LhsField, 2014 SourceLocation *L) { 2015 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 2016 2017 if (isa<CallExpr>(S)) { 2018 // Do not descend into function calls or constructors, as the use 2019 // of an uninitialized field may be valid. One would have to inspect 2020 // the contents of the function/ctor to determine if it is safe or not. 2021 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 2022 // may be safe, depending on what the function/ctor does. 2023 return false; 2024 } 2025 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 2026 const NamedDecl *RhsField = ME->getMemberDecl(); 2027 2028 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 2029 // The member expression points to a static data member. 2030 assert(VD->isStaticDataMember() && 2031 "Member points to non-static data member!"); 2032 (void)VD; 2033 return false; 2034 } 2035 2036 if (isa<EnumConstantDecl>(RhsField)) { 2037 // The member expression points to an enum. 2038 return false; 2039 } 2040 2041 if (RhsField == LhsField) { 2042 // Initializing a field with itself. Throw a warning. 2043 // But wait; there are exceptions! 2044 // Exception #1: The field may not belong to this record. 2045 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 2046 const Expr *base = ME->getBase(); 2047 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 2048 // Even though the field matches, it does not belong to this record. 2049 return false; 2050 } 2051 // None of the exceptions triggered; return true to indicate an 2052 // uninitialized field was used. 2053 *L = ME->getMemberLoc(); 2054 return true; 2055 } 2056 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 2057 // sizeof/alignof doesn't reference contents, do not warn. 2058 return false; 2059 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 2060 // address-of doesn't reference contents (the pointer may be dereferenced 2061 // in the same expression but it would be rare; and weird). 2062 if (UOE->getOpcode() == UO_AddrOf) 2063 return false; 2064 } 2065 for (Stmt::const_child_range it = S->children(); it; ++it) { 2066 if (!*it) { 2067 // An expression such as 'member(arg ?: "")' may trigger this. 2068 continue; 2069 } 2070 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 2071 return true; 2072 } 2073 return false; 2074} 2075 2076MemInitResult 2077Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2078 SourceLocation IdLoc) { 2079 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2080 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2081 assert((DirectMember || IndirectMember) && 2082 "Member must be a FieldDecl or IndirectFieldDecl"); 2083 2084 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2085 return true; 2086 2087 if (Member->isInvalidDecl()) 2088 return true; 2089 2090 // Diagnose value-uses of fields to initialize themselves, e.g. 2091 // foo(foo) 2092 // where foo is not also a parameter to the constructor. 2093 // TODO: implement -Wuninitialized and fold this into that framework. 2094 Expr **Args; 2095 unsigned NumArgs; 2096 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2097 Args = ParenList->getExprs(); 2098 NumArgs = ParenList->getNumExprs(); 2099 } else { 2100 InitListExpr *InitList = cast<InitListExpr>(Init); 2101 Args = InitList->getInits(); 2102 NumArgs = InitList->getNumInits(); 2103 } 2104 for (unsigned i = 0; i < NumArgs; ++i) { 2105 SourceLocation L; 2106 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 2107 // FIXME: Return true in the case when other fields are used before being 2108 // uninitialized. For example, let this field be the i'th field. When 2109 // initializing the i'th field, throw a warning if any of the >= i'th 2110 // fields are used, as they are not yet initialized. 2111 // Right now we are only handling the case where the i'th field uses 2112 // itself in its initializer. 2113 Diag(L, diag::warn_field_is_uninit); 2114 } 2115 } 2116 2117 SourceRange InitRange = Init->getSourceRange(); 2118 2119 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2120 // Can't check initialization for a member of dependent type or when 2121 // any of the arguments are type-dependent expressions. 2122 DiscardCleanupsInEvaluationContext(); 2123 } else { 2124 bool InitList = false; 2125 if (isa<InitListExpr>(Init)) { 2126 InitList = true; 2127 Args = &Init; 2128 NumArgs = 1; 2129 2130 if (isStdInitializerList(Member->getType(), 0)) { 2131 Diag(IdLoc, diag::warn_dangling_std_initializer_list) 2132 << /*at end of ctor*/1 << InitRange; 2133 } 2134 } 2135 2136 // Initialize the member. 2137 InitializedEntity MemberEntity = 2138 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2139 : InitializedEntity::InitializeMember(IndirectMember, 0); 2140 InitializationKind Kind = 2141 InitList ? InitializationKind::CreateDirectList(IdLoc) 2142 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2143 InitRange.getEnd()); 2144 2145 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 2146 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, 2147 MultiExprArg(*this, Args, NumArgs), 2148 0); 2149 if (MemberInit.isInvalid()) 2150 return true; 2151 2152 CheckImplicitConversions(MemberInit.get(), 2153 InitRange.getBegin()); 2154 2155 // C++0x [class.base.init]p7: 2156 // The initialization of each base and member constitutes a 2157 // full-expression. 2158 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2159 if (MemberInit.isInvalid()) 2160 return true; 2161 2162 // If we are in a dependent context, template instantiation will 2163 // perform this type-checking again. Just save the arguments that we 2164 // received. 2165 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2166 // of the information that we have about the member 2167 // initializer. However, deconstructing the ASTs is a dicey process, 2168 // and this approach is far more likely to get the corner cases right. 2169 if (CurContext->isDependentContext()) { 2170 // The existing Init will do fine. 2171 } else { 2172 Init = MemberInit.get(); 2173 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2174 } 2175 } 2176 2177 if (DirectMember) { 2178 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2179 InitRange.getBegin(), Init, 2180 InitRange.getEnd()); 2181 } else { 2182 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2183 InitRange.getBegin(), Init, 2184 InitRange.getEnd()); 2185 } 2186} 2187 2188MemInitResult 2189Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2190 CXXRecordDecl *ClassDecl) { 2191 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2192 if (!LangOpts.CPlusPlus0x) 2193 return Diag(NameLoc, diag::err_delegating_ctor) 2194 << TInfo->getTypeLoc().getLocalSourceRange(); 2195 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2196 2197 bool InitList = true; 2198 Expr **Args = &Init; 2199 unsigned NumArgs = 1; 2200 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2201 InitList = false; 2202 Args = ParenList->getExprs(); 2203 NumArgs = ParenList->getNumExprs(); 2204 } 2205 2206 SourceRange InitRange = Init->getSourceRange(); 2207 // Initialize the object. 2208 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2209 QualType(ClassDecl->getTypeForDecl(), 0)); 2210 InitializationKind Kind = 2211 InitList ? InitializationKind::CreateDirectList(NameLoc) 2212 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2213 InitRange.getEnd()); 2214 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 2215 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2216 MultiExprArg(*this, Args,NumArgs), 2217 0); 2218 if (DelegationInit.isInvalid()) 2219 return true; 2220 2221 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2222 "Delegating constructor with no target?"); 2223 2224 CheckImplicitConversions(DelegationInit.get(), InitRange.getBegin()); 2225 2226 // C++0x [class.base.init]p7: 2227 // The initialization of each base and member constitutes a 2228 // full-expression. 2229 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2230 if (DelegationInit.isInvalid()) 2231 return true; 2232 2233 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2234 DelegationInit.takeAs<Expr>(), 2235 InitRange.getEnd()); 2236} 2237 2238MemInitResult 2239Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2240 Expr *Init, CXXRecordDecl *ClassDecl, 2241 SourceLocation EllipsisLoc) { 2242 SourceLocation BaseLoc 2243 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2244 2245 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2246 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2247 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2248 2249 // C++ [class.base.init]p2: 2250 // [...] Unless the mem-initializer-id names a nonstatic data 2251 // member of the constructor's class or a direct or virtual base 2252 // of that class, the mem-initializer is ill-formed. A 2253 // mem-initializer-list can initialize a base class using any 2254 // name that denotes that base class type. 2255 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2256 2257 SourceRange InitRange = Init->getSourceRange(); 2258 if (EllipsisLoc.isValid()) { 2259 // This is a pack expansion. 2260 if (!BaseType->containsUnexpandedParameterPack()) { 2261 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2262 << SourceRange(BaseLoc, InitRange.getEnd()); 2263 2264 EllipsisLoc = SourceLocation(); 2265 } 2266 } else { 2267 // Check for any unexpanded parameter packs. 2268 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2269 return true; 2270 2271 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2272 return true; 2273 } 2274 2275 // Check for direct and virtual base classes. 2276 const CXXBaseSpecifier *DirectBaseSpec = 0; 2277 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2278 if (!Dependent) { 2279 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2280 BaseType)) 2281 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2282 2283 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2284 VirtualBaseSpec); 2285 2286 // C++ [base.class.init]p2: 2287 // Unless the mem-initializer-id names a nonstatic data member of the 2288 // constructor's class or a direct or virtual base of that class, the 2289 // mem-initializer is ill-formed. 2290 if (!DirectBaseSpec && !VirtualBaseSpec) { 2291 // If the class has any dependent bases, then it's possible that 2292 // one of those types will resolve to the same type as 2293 // BaseType. Therefore, just treat this as a dependent base 2294 // class initialization. FIXME: Should we try to check the 2295 // initialization anyway? It seems odd. 2296 if (ClassDecl->hasAnyDependentBases()) 2297 Dependent = true; 2298 else 2299 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2300 << BaseType << Context.getTypeDeclType(ClassDecl) 2301 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2302 } 2303 } 2304 2305 if (Dependent) { 2306 DiscardCleanupsInEvaluationContext(); 2307 2308 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2309 /*IsVirtual=*/false, 2310 InitRange.getBegin(), Init, 2311 InitRange.getEnd(), EllipsisLoc); 2312 } 2313 2314 // C++ [base.class.init]p2: 2315 // If a mem-initializer-id is ambiguous because it designates both 2316 // a direct non-virtual base class and an inherited virtual base 2317 // class, the mem-initializer is ill-formed. 2318 if (DirectBaseSpec && VirtualBaseSpec) 2319 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2320 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2321 2322 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2323 if (!BaseSpec) 2324 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2325 2326 // Initialize the base. 2327 bool InitList = true; 2328 Expr **Args = &Init; 2329 unsigned NumArgs = 1; 2330 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2331 InitList = false; 2332 Args = ParenList->getExprs(); 2333 NumArgs = ParenList->getNumExprs(); 2334 } 2335 2336 InitializedEntity BaseEntity = 2337 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2338 InitializationKind Kind = 2339 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2340 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2341 InitRange.getEnd()); 2342 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 2343 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, 2344 MultiExprArg(*this, Args, NumArgs), 2345 0); 2346 if (BaseInit.isInvalid()) 2347 return true; 2348 2349 CheckImplicitConversions(BaseInit.get(), InitRange.getBegin()); 2350 2351 // C++0x [class.base.init]p7: 2352 // The initialization of each base and member constitutes a 2353 // full-expression. 2354 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2355 if (BaseInit.isInvalid()) 2356 return true; 2357 2358 // If we are in a dependent context, template instantiation will 2359 // perform this type-checking again. Just save the arguments that we 2360 // received in a ParenListExpr. 2361 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2362 // of the information that we have about the base 2363 // initializer. However, deconstructing the ASTs is a dicey process, 2364 // and this approach is far more likely to get the corner cases right. 2365 if (CurContext->isDependentContext()) 2366 BaseInit = Owned(Init); 2367 2368 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2369 BaseSpec->isVirtual(), 2370 InitRange.getBegin(), 2371 BaseInit.takeAs<Expr>(), 2372 InitRange.getEnd(), EllipsisLoc); 2373} 2374 2375// Create a static_cast\<T&&>(expr). 2376static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2377 QualType ExprType = E->getType(); 2378 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2379 SourceLocation ExprLoc = E->getLocStart(); 2380 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2381 TargetType, ExprLoc); 2382 2383 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2384 SourceRange(ExprLoc, ExprLoc), 2385 E->getSourceRange()).take(); 2386} 2387 2388/// ImplicitInitializerKind - How an implicit base or member initializer should 2389/// initialize its base or member. 2390enum ImplicitInitializerKind { 2391 IIK_Default, 2392 IIK_Copy, 2393 IIK_Move 2394}; 2395 2396static bool 2397BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2398 ImplicitInitializerKind ImplicitInitKind, 2399 CXXBaseSpecifier *BaseSpec, 2400 bool IsInheritedVirtualBase, 2401 CXXCtorInitializer *&CXXBaseInit) { 2402 InitializedEntity InitEntity 2403 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2404 IsInheritedVirtualBase); 2405 2406 ExprResult BaseInit; 2407 2408 switch (ImplicitInitKind) { 2409 case IIK_Default: { 2410 InitializationKind InitKind 2411 = InitializationKind::CreateDefault(Constructor->getLocation()); 2412 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2413 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2414 MultiExprArg(SemaRef, 0, 0)); 2415 break; 2416 } 2417 2418 case IIK_Move: 2419 case IIK_Copy: { 2420 bool Moving = ImplicitInitKind == IIK_Move; 2421 ParmVarDecl *Param = Constructor->getParamDecl(0); 2422 QualType ParamType = Param->getType().getNonReferenceType(); 2423 2424 Expr *CopyCtorArg = 2425 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2426 SourceLocation(), Param, false, 2427 Constructor->getLocation(), ParamType, 2428 VK_LValue, 0); 2429 2430 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2431 2432 // Cast to the base class to avoid ambiguities. 2433 QualType ArgTy = 2434 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2435 ParamType.getQualifiers()); 2436 2437 if (Moving) { 2438 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2439 } 2440 2441 CXXCastPath BasePath; 2442 BasePath.push_back(BaseSpec); 2443 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2444 CK_UncheckedDerivedToBase, 2445 Moving ? VK_XValue : VK_LValue, 2446 &BasePath).take(); 2447 2448 InitializationKind InitKind 2449 = InitializationKind::CreateDirect(Constructor->getLocation(), 2450 SourceLocation(), SourceLocation()); 2451 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2452 &CopyCtorArg, 1); 2453 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2454 MultiExprArg(&CopyCtorArg, 1)); 2455 break; 2456 } 2457 } 2458 2459 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2460 if (BaseInit.isInvalid()) 2461 return true; 2462 2463 CXXBaseInit = 2464 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2465 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2466 SourceLocation()), 2467 BaseSpec->isVirtual(), 2468 SourceLocation(), 2469 BaseInit.takeAs<Expr>(), 2470 SourceLocation(), 2471 SourceLocation()); 2472 2473 return false; 2474} 2475 2476static bool RefersToRValueRef(Expr *MemRef) { 2477 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2478 return Referenced->getType()->isRValueReferenceType(); 2479} 2480 2481static bool 2482BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2483 ImplicitInitializerKind ImplicitInitKind, 2484 FieldDecl *Field, IndirectFieldDecl *Indirect, 2485 CXXCtorInitializer *&CXXMemberInit) { 2486 if (Field->isInvalidDecl()) 2487 return true; 2488 2489 SourceLocation Loc = Constructor->getLocation(); 2490 2491 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2492 bool Moving = ImplicitInitKind == IIK_Move; 2493 ParmVarDecl *Param = Constructor->getParamDecl(0); 2494 QualType ParamType = Param->getType().getNonReferenceType(); 2495 2496 // Suppress copying zero-width bitfields. 2497 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2498 return false; 2499 2500 Expr *MemberExprBase = 2501 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2502 SourceLocation(), Param, false, 2503 Loc, ParamType, VK_LValue, 0); 2504 2505 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2506 2507 if (Moving) { 2508 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2509 } 2510 2511 // Build a reference to this field within the parameter. 2512 CXXScopeSpec SS; 2513 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2514 Sema::LookupMemberName); 2515 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2516 : cast<ValueDecl>(Field), AS_public); 2517 MemberLookup.resolveKind(); 2518 ExprResult CtorArg 2519 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2520 ParamType, Loc, 2521 /*IsArrow=*/false, 2522 SS, 2523 /*TemplateKWLoc=*/SourceLocation(), 2524 /*FirstQualifierInScope=*/0, 2525 MemberLookup, 2526 /*TemplateArgs=*/0); 2527 if (CtorArg.isInvalid()) 2528 return true; 2529 2530 // C++11 [class.copy]p15: 2531 // - if a member m has rvalue reference type T&&, it is direct-initialized 2532 // with static_cast<T&&>(x.m); 2533 if (RefersToRValueRef(CtorArg.get())) { 2534 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2535 } 2536 2537 // When the field we are copying is an array, create index variables for 2538 // each dimension of the array. We use these index variables to subscript 2539 // the source array, and other clients (e.g., CodeGen) will perform the 2540 // necessary iteration with these index variables. 2541 SmallVector<VarDecl *, 4> IndexVariables; 2542 QualType BaseType = Field->getType(); 2543 QualType SizeType = SemaRef.Context.getSizeType(); 2544 bool InitializingArray = false; 2545 while (const ConstantArrayType *Array 2546 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2547 InitializingArray = true; 2548 // Create the iteration variable for this array index. 2549 IdentifierInfo *IterationVarName = 0; 2550 { 2551 SmallString<8> Str; 2552 llvm::raw_svector_ostream OS(Str); 2553 OS << "__i" << IndexVariables.size(); 2554 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2555 } 2556 VarDecl *IterationVar 2557 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2558 IterationVarName, SizeType, 2559 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2560 SC_None, SC_None); 2561 IndexVariables.push_back(IterationVar); 2562 2563 // Create a reference to the iteration variable. 2564 ExprResult IterationVarRef 2565 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2566 assert(!IterationVarRef.isInvalid() && 2567 "Reference to invented variable cannot fail!"); 2568 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2569 assert(!IterationVarRef.isInvalid() && 2570 "Conversion of invented variable cannot fail!"); 2571 2572 // Subscript the array with this iteration variable. 2573 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2574 IterationVarRef.take(), 2575 Loc); 2576 if (CtorArg.isInvalid()) 2577 return true; 2578 2579 BaseType = Array->getElementType(); 2580 } 2581 2582 // The array subscript expression is an lvalue, which is wrong for moving. 2583 if (Moving && InitializingArray) 2584 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2585 2586 // Construct the entity that we will be initializing. For an array, this 2587 // will be first element in the array, which may require several levels 2588 // of array-subscript entities. 2589 SmallVector<InitializedEntity, 4> Entities; 2590 Entities.reserve(1 + IndexVariables.size()); 2591 if (Indirect) 2592 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2593 else 2594 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2595 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2596 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2597 0, 2598 Entities.back())); 2599 2600 // Direct-initialize to use the copy constructor. 2601 InitializationKind InitKind = 2602 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2603 2604 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2605 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2606 &CtorArgE, 1); 2607 2608 ExprResult MemberInit 2609 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2610 MultiExprArg(&CtorArgE, 1)); 2611 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2612 if (MemberInit.isInvalid()) 2613 return true; 2614 2615 if (Indirect) { 2616 assert(IndexVariables.size() == 0 && 2617 "Indirect field improperly initialized"); 2618 CXXMemberInit 2619 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2620 Loc, Loc, 2621 MemberInit.takeAs<Expr>(), 2622 Loc); 2623 } else 2624 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2625 Loc, MemberInit.takeAs<Expr>(), 2626 Loc, 2627 IndexVariables.data(), 2628 IndexVariables.size()); 2629 return false; 2630 } 2631 2632 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2633 2634 QualType FieldBaseElementType = 2635 SemaRef.Context.getBaseElementType(Field->getType()); 2636 2637 if (FieldBaseElementType->isRecordType()) { 2638 InitializedEntity InitEntity 2639 = Indirect? InitializedEntity::InitializeMember(Indirect) 2640 : InitializedEntity::InitializeMember(Field); 2641 InitializationKind InitKind = 2642 InitializationKind::CreateDefault(Loc); 2643 2644 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2645 ExprResult MemberInit = 2646 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2647 2648 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2649 if (MemberInit.isInvalid()) 2650 return true; 2651 2652 if (Indirect) 2653 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2654 Indirect, Loc, 2655 Loc, 2656 MemberInit.get(), 2657 Loc); 2658 else 2659 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2660 Field, Loc, Loc, 2661 MemberInit.get(), 2662 Loc); 2663 return false; 2664 } 2665 2666 if (!Field->getParent()->isUnion()) { 2667 if (FieldBaseElementType->isReferenceType()) { 2668 SemaRef.Diag(Constructor->getLocation(), 2669 diag::err_uninitialized_member_in_ctor) 2670 << (int)Constructor->isImplicit() 2671 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2672 << 0 << Field->getDeclName(); 2673 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2674 return true; 2675 } 2676 2677 if (FieldBaseElementType.isConstQualified()) { 2678 SemaRef.Diag(Constructor->getLocation(), 2679 diag::err_uninitialized_member_in_ctor) 2680 << (int)Constructor->isImplicit() 2681 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2682 << 1 << Field->getDeclName(); 2683 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2684 return true; 2685 } 2686 } 2687 2688 if (SemaRef.getLangOpts().ObjCAutoRefCount && 2689 FieldBaseElementType->isObjCRetainableType() && 2690 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2691 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2692 // Instant objects: 2693 // Default-initialize Objective-C pointers to NULL. 2694 CXXMemberInit 2695 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2696 Loc, Loc, 2697 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2698 Loc); 2699 return false; 2700 } 2701 2702 // Nothing to initialize. 2703 CXXMemberInit = 0; 2704 return false; 2705} 2706 2707namespace { 2708struct BaseAndFieldInfo { 2709 Sema &S; 2710 CXXConstructorDecl *Ctor; 2711 bool AnyErrorsInInits; 2712 ImplicitInitializerKind IIK; 2713 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2714 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2715 2716 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2717 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2718 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2719 if (Generated && Ctor->isCopyConstructor()) 2720 IIK = IIK_Copy; 2721 else if (Generated && Ctor->isMoveConstructor()) 2722 IIK = IIK_Move; 2723 else 2724 IIK = IIK_Default; 2725 } 2726 2727 bool isImplicitCopyOrMove() const { 2728 switch (IIK) { 2729 case IIK_Copy: 2730 case IIK_Move: 2731 return true; 2732 2733 case IIK_Default: 2734 return false; 2735 } 2736 2737 llvm_unreachable("Invalid ImplicitInitializerKind!"); 2738 } 2739}; 2740} 2741 2742/// \brief Determine whether the given indirect field declaration is somewhere 2743/// within an anonymous union. 2744static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2745 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2746 CEnd = F->chain_end(); 2747 C != CEnd; ++C) 2748 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2749 if (Record->isUnion()) 2750 return true; 2751 2752 return false; 2753} 2754 2755/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2756/// array type. 2757static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2758 if (T->isIncompleteArrayType()) 2759 return true; 2760 2761 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2762 if (!ArrayT->getSize()) 2763 return true; 2764 2765 T = ArrayT->getElementType(); 2766 } 2767 2768 return false; 2769} 2770 2771static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2772 FieldDecl *Field, 2773 IndirectFieldDecl *Indirect = 0) { 2774 2775 // Overwhelmingly common case: we have a direct initializer for this field. 2776 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2777 Info.AllToInit.push_back(Init); 2778 return false; 2779 } 2780 2781 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2782 // has a brace-or-equal-initializer, the entity is initialized as specified 2783 // in [dcl.init]. 2784 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 2785 CXXCtorInitializer *Init; 2786 if (Indirect) 2787 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2788 SourceLocation(), 2789 SourceLocation(), 0, 2790 SourceLocation()); 2791 else 2792 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2793 SourceLocation(), 2794 SourceLocation(), 0, 2795 SourceLocation()); 2796 Info.AllToInit.push_back(Init); 2797 return false; 2798 } 2799 2800 // Don't build an implicit initializer for union members if none was 2801 // explicitly specified. 2802 if (Field->getParent()->isUnion() || 2803 (Indirect && isWithinAnonymousUnion(Indirect))) 2804 return false; 2805 2806 // Don't initialize incomplete or zero-length arrays. 2807 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 2808 return false; 2809 2810 // Don't try to build an implicit initializer if there were semantic 2811 // errors in any of the initializers (and therefore we might be 2812 // missing some that the user actually wrote). 2813 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2814 return false; 2815 2816 CXXCtorInitializer *Init = 0; 2817 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2818 Indirect, Init)) 2819 return true; 2820 2821 if (Init) 2822 Info.AllToInit.push_back(Init); 2823 2824 return false; 2825} 2826 2827bool 2828Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2829 CXXCtorInitializer *Initializer) { 2830 assert(Initializer->isDelegatingInitializer()); 2831 Constructor->setNumCtorInitializers(1); 2832 CXXCtorInitializer **initializer = 2833 new (Context) CXXCtorInitializer*[1]; 2834 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2835 Constructor->setCtorInitializers(initializer); 2836 2837 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2838 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 2839 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2840 } 2841 2842 DelegatingCtorDecls.push_back(Constructor); 2843 2844 return false; 2845} 2846 2847bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2848 CXXCtorInitializer **Initializers, 2849 unsigned NumInitializers, 2850 bool AnyErrors) { 2851 if (Constructor->isDependentContext()) { 2852 // Just store the initializers as written, they will be checked during 2853 // instantiation. 2854 if (NumInitializers > 0) { 2855 Constructor->setNumCtorInitializers(NumInitializers); 2856 CXXCtorInitializer **baseOrMemberInitializers = 2857 new (Context) CXXCtorInitializer*[NumInitializers]; 2858 memcpy(baseOrMemberInitializers, Initializers, 2859 NumInitializers * sizeof(CXXCtorInitializer*)); 2860 Constructor->setCtorInitializers(baseOrMemberInitializers); 2861 } 2862 2863 return false; 2864 } 2865 2866 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2867 2868 // We need to build the initializer AST according to order of construction 2869 // and not what user specified in the Initializers list. 2870 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2871 if (!ClassDecl) 2872 return true; 2873 2874 bool HadError = false; 2875 2876 for (unsigned i = 0; i < NumInitializers; i++) { 2877 CXXCtorInitializer *Member = Initializers[i]; 2878 2879 if (Member->isBaseInitializer()) 2880 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2881 else 2882 Info.AllBaseFields[Member->getAnyMember()] = Member; 2883 } 2884 2885 // Keep track of the direct virtual bases. 2886 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2887 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2888 E = ClassDecl->bases_end(); I != E; ++I) { 2889 if (I->isVirtual()) 2890 DirectVBases.insert(I); 2891 } 2892 2893 // Push virtual bases before others. 2894 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2895 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2896 2897 if (CXXCtorInitializer *Value 2898 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2899 Info.AllToInit.push_back(Value); 2900 } else if (!AnyErrors) { 2901 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2902 CXXCtorInitializer *CXXBaseInit; 2903 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2904 VBase, IsInheritedVirtualBase, 2905 CXXBaseInit)) { 2906 HadError = true; 2907 continue; 2908 } 2909 2910 Info.AllToInit.push_back(CXXBaseInit); 2911 } 2912 } 2913 2914 // Non-virtual bases. 2915 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2916 E = ClassDecl->bases_end(); Base != E; ++Base) { 2917 // Virtuals are in the virtual base list and already constructed. 2918 if (Base->isVirtual()) 2919 continue; 2920 2921 if (CXXCtorInitializer *Value 2922 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2923 Info.AllToInit.push_back(Value); 2924 } else if (!AnyErrors) { 2925 CXXCtorInitializer *CXXBaseInit; 2926 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2927 Base, /*IsInheritedVirtualBase=*/false, 2928 CXXBaseInit)) { 2929 HadError = true; 2930 continue; 2931 } 2932 2933 Info.AllToInit.push_back(CXXBaseInit); 2934 } 2935 } 2936 2937 // Fields. 2938 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 2939 MemEnd = ClassDecl->decls_end(); 2940 Mem != MemEnd; ++Mem) { 2941 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 2942 // C++ [class.bit]p2: 2943 // A declaration for a bit-field that omits the identifier declares an 2944 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 2945 // initialized. 2946 if (F->isUnnamedBitfield()) 2947 continue; 2948 2949 // If we're not generating the implicit copy/move constructor, then we'll 2950 // handle anonymous struct/union fields based on their individual 2951 // indirect fields. 2952 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 2953 continue; 2954 2955 if (CollectFieldInitializer(*this, Info, F)) 2956 HadError = true; 2957 continue; 2958 } 2959 2960 // Beyond this point, we only consider default initialization. 2961 if (Info.IIK != IIK_Default) 2962 continue; 2963 2964 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 2965 if (F->getType()->isIncompleteArrayType()) { 2966 assert(ClassDecl->hasFlexibleArrayMember() && 2967 "Incomplete array type is not valid"); 2968 continue; 2969 } 2970 2971 // Initialize each field of an anonymous struct individually. 2972 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 2973 HadError = true; 2974 2975 continue; 2976 } 2977 } 2978 2979 NumInitializers = Info.AllToInit.size(); 2980 if (NumInitializers > 0) { 2981 Constructor->setNumCtorInitializers(NumInitializers); 2982 CXXCtorInitializer **baseOrMemberInitializers = 2983 new (Context) CXXCtorInitializer*[NumInitializers]; 2984 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2985 NumInitializers * sizeof(CXXCtorInitializer*)); 2986 Constructor->setCtorInitializers(baseOrMemberInitializers); 2987 2988 // Constructors implicitly reference the base and member 2989 // destructors. 2990 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2991 Constructor->getParent()); 2992 } 2993 2994 return HadError; 2995} 2996 2997static void *GetKeyForTopLevelField(FieldDecl *Field) { 2998 // For anonymous unions, use the class declaration as the key. 2999 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 3000 if (RT->getDecl()->isAnonymousStructOrUnion()) 3001 return static_cast<void *>(RT->getDecl()); 3002 } 3003 return static_cast<void *>(Field); 3004} 3005 3006static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 3007 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 3008} 3009 3010static void *GetKeyForMember(ASTContext &Context, 3011 CXXCtorInitializer *Member) { 3012 if (!Member->isAnyMemberInitializer()) 3013 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3014 3015 // For fields injected into the class via declaration of an anonymous union, 3016 // use its anonymous union class declaration as the unique key. 3017 FieldDecl *Field = Member->getAnyMember(); 3018 3019 // If the field is a member of an anonymous struct or union, our key 3020 // is the anonymous record decl that's a direct child of the class. 3021 RecordDecl *RD = Field->getParent(); 3022 if (RD->isAnonymousStructOrUnion()) { 3023 while (true) { 3024 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 3025 if (Parent->isAnonymousStructOrUnion()) 3026 RD = Parent; 3027 else 3028 break; 3029 } 3030 3031 return static_cast<void *>(RD); 3032 } 3033 3034 return static_cast<void *>(Field); 3035} 3036 3037static void 3038DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 3039 const CXXConstructorDecl *Constructor, 3040 CXXCtorInitializer **Inits, 3041 unsigned NumInits) { 3042 if (Constructor->getDeclContext()->isDependentContext()) 3043 return; 3044 3045 // Don't check initializers order unless the warning is enabled at the 3046 // location of at least one initializer. 3047 bool ShouldCheckOrder = false; 3048 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3049 CXXCtorInitializer *Init = Inits[InitIndex]; 3050 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3051 Init->getSourceLocation()) 3052 != DiagnosticsEngine::Ignored) { 3053 ShouldCheckOrder = true; 3054 break; 3055 } 3056 } 3057 if (!ShouldCheckOrder) 3058 return; 3059 3060 // Build the list of bases and members in the order that they'll 3061 // actually be initialized. The explicit initializers should be in 3062 // this same order but may be missing things. 3063 SmallVector<const void*, 32> IdealInitKeys; 3064 3065 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3066 3067 // 1. Virtual bases. 3068 for (CXXRecordDecl::base_class_const_iterator VBase = 3069 ClassDecl->vbases_begin(), 3070 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3071 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3072 3073 // 2. Non-virtual bases. 3074 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3075 E = ClassDecl->bases_end(); Base != E; ++Base) { 3076 if (Base->isVirtual()) 3077 continue; 3078 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3079 } 3080 3081 // 3. Direct fields. 3082 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3083 E = ClassDecl->field_end(); Field != E; ++Field) { 3084 if (Field->isUnnamedBitfield()) 3085 continue; 3086 3087 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 3088 } 3089 3090 unsigned NumIdealInits = IdealInitKeys.size(); 3091 unsigned IdealIndex = 0; 3092 3093 CXXCtorInitializer *PrevInit = 0; 3094 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3095 CXXCtorInitializer *Init = Inits[InitIndex]; 3096 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3097 3098 // Scan forward to try to find this initializer in the idealized 3099 // initializers list. 3100 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3101 if (InitKey == IdealInitKeys[IdealIndex]) 3102 break; 3103 3104 // If we didn't find this initializer, it must be because we 3105 // scanned past it on a previous iteration. That can only 3106 // happen if we're out of order; emit a warning. 3107 if (IdealIndex == NumIdealInits && PrevInit) { 3108 Sema::SemaDiagnosticBuilder D = 3109 SemaRef.Diag(PrevInit->getSourceLocation(), 3110 diag::warn_initializer_out_of_order); 3111 3112 if (PrevInit->isAnyMemberInitializer()) 3113 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3114 else 3115 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3116 3117 if (Init->isAnyMemberInitializer()) 3118 D << 0 << Init->getAnyMember()->getDeclName(); 3119 else 3120 D << 1 << Init->getTypeSourceInfo()->getType(); 3121 3122 // Move back to the initializer's location in the ideal list. 3123 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3124 if (InitKey == IdealInitKeys[IdealIndex]) 3125 break; 3126 3127 assert(IdealIndex != NumIdealInits && 3128 "initializer not found in initializer list"); 3129 } 3130 3131 PrevInit = Init; 3132 } 3133} 3134 3135namespace { 3136bool CheckRedundantInit(Sema &S, 3137 CXXCtorInitializer *Init, 3138 CXXCtorInitializer *&PrevInit) { 3139 if (!PrevInit) { 3140 PrevInit = Init; 3141 return false; 3142 } 3143 3144 if (FieldDecl *Field = Init->getMember()) 3145 S.Diag(Init->getSourceLocation(), 3146 diag::err_multiple_mem_initialization) 3147 << Field->getDeclName() 3148 << Init->getSourceRange(); 3149 else { 3150 const Type *BaseClass = Init->getBaseClass(); 3151 assert(BaseClass && "neither field nor base"); 3152 S.Diag(Init->getSourceLocation(), 3153 diag::err_multiple_base_initialization) 3154 << QualType(BaseClass, 0) 3155 << Init->getSourceRange(); 3156 } 3157 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3158 << 0 << PrevInit->getSourceRange(); 3159 3160 return true; 3161} 3162 3163typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3164typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3165 3166bool CheckRedundantUnionInit(Sema &S, 3167 CXXCtorInitializer *Init, 3168 RedundantUnionMap &Unions) { 3169 FieldDecl *Field = Init->getAnyMember(); 3170 RecordDecl *Parent = Field->getParent(); 3171 NamedDecl *Child = Field; 3172 3173 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3174 if (Parent->isUnion()) { 3175 UnionEntry &En = Unions[Parent]; 3176 if (En.first && En.first != Child) { 3177 S.Diag(Init->getSourceLocation(), 3178 diag::err_multiple_mem_union_initialization) 3179 << Field->getDeclName() 3180 << Init->getSourceRange(); 3181 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3182 << 0 << En.second->getSourceRange(); 3183 return true; 3184 } 3185 if (!En.first) { 3186 En.first = Child; 3187 En.second = Init; 3188 } 3189 if (!Parent->isAnonymousStructOrUnion()) 3190 return false; 3191 } 3192 3193 Child = Parent; 3194 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3195 } 3196 3197 return false; 3198} 3199} 3200 3201/// ActOnMemInitializers - Handle the member initializers for a constructor. 3202void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3203 SourceLocation ColonLoc, 3204 CXXCtorInitializer **meminits, 3205 unsigned NumMemInits, 3206 bool AnyErrors) { 3207 if (!ConstructorDecl) 3208 return; 3209 3210 AdjustDeclIfTemplate(ConstructorDecl); 3211 3212 CXXConstructorDecl *Constructor 3213 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3214 3215 if (!Constructor) { 3216 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3217 return; 3218 } 3219 3220 CXXCtorInitializer **MemInits = 3221 reinterpret_cast<CXXCtorInitializer **>(meminits); 3222 3223 // Mapping for the duplicate initializers check. 3224 // For member initializers, this is keyed with a FieldDecl*. 3225 // For base initializers, this is keyed with a Type*. 3226 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3227 3228 // Mapping for the inconsistent anonymous-union initializers check. 3229 RedundantUnionMap MemberUnions; 3230 3231 bool HadError = false; 3232 for (unsigned i = 0; i < NumMemInits; i++) { 3233 CXXCtorInitializer *Init = MemInits[i]; 3234 3235 // Set the source order index. 3236 Init->setSourceOrder(i); 3237 3238 if (Init->isAnyMemberInitializer()) { 3239 FieldDecl *Field = Init->getAnyMember(); 3240 if (CheckRedundantInit(*this, Init, Members[Field]) || 3241 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3242 HadError = true; 3243 } else if (Init->isBaseInitializer()) { 3244 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3245 if (CheckRedundantInit(*this, Init, Members[Key])) 3246 HadError = true; 3247 } else { 3248 assert(Init->isDelegatingInitializer()); 3249 // This must be the only initializer 3250 if (i != 0 || NumMemInits > 1) { 3251 Diag(MemInits[0]->getSourceLocation(), 3252 diag::err_delegating_initializer_alone) 3253 << MemInits[0]->getSourceRange(); 3254 HadError = true; 3255 // We will treat this as being the only initializer. 3256 } 3257 SetDelegatingInitializer(Constructor, MemInits[i]); 3258 // Return immediately as the initializer is set. 3259 return; 3260 } 3261 } 3262 3263 if (HadError) 3264 return; 3265 3266 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3267 3268 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3269} 3270 3271void 3272Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3273 CXXRecordDecl *ClassDecl) { 3274 // Ignore dependent contexts. Also ignore unions, since their members never 3275 // have destructors implicitly called. 3276 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3277 return; 3278 3279 // FIXME: all the access-control diagnostics are positioned on the 3280 // field/base declaration. That's probably good; that said, the 3281 // user might reasonably want to know why the destructor is being 3282 // emitted, and we currently don't say. 3283 3284 // Non-static data members. 3285 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3286 E = ClassDecl->field_end(); I != E; ++I) { 3287 FieldDecl *Field = *I; 3288 if (Field->isInvalidDecl()) 3289 continue; 3290 3291 // Don't destroy incomplete or zero-length arrays. 3292 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3293 continue; 3294 3295 QualType FieldType = Context.getBaseElementType(Field->getType()); 3296 3297 const RecordType* RT = FieldType->getAs<RecordType>(); 3298 if (!RT) 3299 continue; 3300 3301 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3302 if (FieldClassDecl->isInvalidDecl()) 3303 continue; 3304 if (FieldClassDecl->hasIrrelevantDestructor()) 3305 continue; 3306 // The destructor for an implicit anonymous union member is never invoked. 3307 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) 3308 continue; 3309 3310 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3311 assert(Dtor && "No dtor found for FieldClassDecl!"); 3312 CheckDestructorAccess(Field->getLocation(), Dtor, 3313 PDiag(diag::err_access_dtor_field) 3314 << Field->getDeclName() 3315 << FieldType); 3316 3317 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3318 DiagnoseUseOfDecl(Dtor, Location); 3319 } 3320 3321 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3322 3323 // Bases. 3324 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3325 E = ClassDecl->bases_end(); Base != E; ++Base) { 3326 // Bases are always records in a well-formed non-dependent class. 3327 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3328 3329 // Remember direct virtual bases. 3330 if (Base->isVirtual()) 3331 DirectVirtualBases.insert(RT); 3332 3333 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3334 // If our base class is invalid, we probably can't get its dtor anyway. 3335 if (BaseClassDecl->isInvalidDecl()) 3336 continue; 3337 if (BaseClassDecl->hasIrrelevantDestructor()) 3338 continue; 3339 3340 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3341 assert(Dtor && "No dtor found for BaseClassDecl!"); 3342 3343 // FIXME: caret should be on the start of the class name 3344 CheckDestructorAccess(Base->getLocStart(), Dtor, 3345 PDiag(diag::err_access_dtor_base) 3346 << Base->getType() 3347 << Base->getSourceRange(), 3348 Context.getTypeDeclType(ClassDecl)); 3349 3350 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3351 DiagnoseUseOfDecl(Dtor, Location); 3352 } 3353 3354 // Virtual bases. 3355 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3356 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3357 3358 // Bases are always records in a well-formed non-dependent class. 3359 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 3360 3361 // Ignore direct virtual bases. 3362 if (DirectVirtualBases.count(RT)) 3363 continue; 3364 3365 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3366 // If our base class is invalid, we probably can't get its dtor anyway. 3367 if (BaseClassDecl->isInvalidDecl()) 3368 continue; 3369 if (BaseClassDecl->hasIrrelevantDestructor()) 3370 continue; 3371 3372 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3373 assert(Dtor && "No dtor found for BaseClassDecl!"); 3374 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3375 PDiag(diag::err_access_dtor_vbase) 3376 << VBase->getType()); 3377 3378 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3379 DiagnoseUseOfDecl(Dtor, Location); 3380 } 3381} 3382 3383void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3384 if (!CDtorDecl) 3385 return; 3386 3387 if (CXXConstructorDecl *Constructor 3388 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3389 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3390} 3391 3392bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3393 unsigned DiagID, AbstractDiagSelID SelID) { 3394 if (SelID == -1) 3395 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 3396 else 3397 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 3398} 3399 3400bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3401 const PartialDiagnostic &PD) { 3402 if (!getLangOpts().CPlusPlus) 3403 return false; 3404 3405 if (const ArrayType *AT = Context.getAsArrayType(T)) 3406 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3407 3408 if (const PointerType *PT = T->getAs<PointerType>()) { 3409 // Find the innermost pointer type. 3410 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3411 PT = T; 3412 3413 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3414 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3415 } 3416 3417 const RecordType *RT = T->getAs<RecordType>(); 3418 if (!RT) 3419 return false; 3420 3421 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3422 3423 // We can't answer whether something is abstract until it has a 3424 // definition. If it's currently being defined, we'll walk back 3425 // over all the declarations when we have a full definition. 3426 const CXXRecordDecl *Def = RD->getDefinition(); 3427 if (!Def || Def->isBeingDefined()) 3428 return false; 3429 3430 if (!RD->isAbstract()) 3431 return false; 3432 3433 Diag(Loc, PD) << RD->getDeclName(); 3434 DiagnoseAbstractType(RD); 3435 3436 return true; 3437} 3438 3439void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3440 // Check if we've already emitted the list of pure virtual functions 3441 // for this class. 3442 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3443 return; 3444 3445 CXXFinalOverriderMap FinalOverriders; 3446 RD->getFinalOverriders(FinalOverriders); 3447 3448 // Keep a set of seen pure methods so we won't diagnose the same method 3449 // more than once. 3450 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3451 3452 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3453 MEnd = FinalOverriders.end(); 3454 M != MEnd; 3455 ++M) { 3456 for (OverridingMethods::iterator SO = M->second.begin(), 3457 SOEnd = M->second.end(); 3458 SO != SOEnd; ++SO) { 3459 // C++ [class.abstract]p4: 3460 // A class is abstract if it contains or inherits at least one 3461 // pure virtual function for which the final overrider is pure 3462 // virtual. 3463 3464 // 3465 if (SO->second.size() != 1) 3466 continue; 3467 3468 if (!SO->second.front().Method->isPure()) 3469 continue; 3470 3471 if (!SeenPureMethods.insert(SO->second.front().Method)) 3472 continue; 3473 3474 Diag(SO->second.front().Method->getLocation(), 3475 diag::note_pure_virtual_function) 3476 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3477 } 3478 } 3479 3480 if (!PureVirtualClassDiagSet) 3481 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3482 PureVirtualClassDiagSet->insert(RD); 3483} 3484 3485namespace { 3486struct AbstractUsageInfo { 3487 Sema &S; 3488 CXXRecordDecl *Record; 3489 CanQualType AbstractType; 3490 bool Invalid; 3491 3492 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3493 : S(S), Record(Record), 3494 AbstractType(S.Context.getCanonicalType( 3495 S.Context.getTypeDeclType(Record))), 3496 Invalid(false) {} 3497 3498 void DiagnoseAbstractType() { 3499 if (Invalid) return; 3500 S.DiagnoseAbstractType(Record); 3501 Invalid = true; 3502 } 3503 3504 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3505}; 3506 3507struct CheckAbstractUsage { 3508 AbstractUsageInfo &Info; 3509 const NamedDecl *Ctx; 3510 3511 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3512 : Info(Info), Ctx(Ctx) {} 3513 3514 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3515 switch (TL.getTypeLocClass()) { 3516#define ABSTRACT_TYPELOC(CLASS, PARENT) 3517#define TYPELOC(CLASS, PARENT) \ 3518 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3519#include "clang/AST/TypeLocNodes.def" 3520 } 3521 } 3522 3523 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3524 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3525 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3526 if (!TL.getArg(I)) 3527 continue; 3528 3529 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3530 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3531 } 3532 } 3533 3534 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3535 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3536 } 3537 3538 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3539 // Visit the type parameters from a permissive context. 3540 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3541 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3542 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3543 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3544 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3545 // TODO: other template argument types? 3546 } 3547 } 3548 3549 // Visit pointee types from a permissive context. 3550#define CheckPolymorphic(Type) \ 3551 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3552 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3553 } 3554 CheckPolymorphic(PointerTypeLoc) 3555 CheckPolymorphic(ReferenceTypeLoc) 3556 CheckPolymorphic(MemberPointerTypeLoc) 3557 CheckPolymorphic(BlockPointerTypeLoc) 3558 CheckPolymorphic(AtomicTypeLoc) 3559 3560 /// Handle all the types we haven't given a more specific 3561 /// implementation for above. 3562 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3563 // Every other kind of type that we haven't called out already 3564 // that has an inner type is either (1) sugar or (2) contains that 3565 // inner type in some way as a subobject. 3566 if (TypeLoc Next = TL.getNextTypeLoc()) 3567 return Visit(Next, Sel); 3568 3569 // If there's no inner type and we're in a permissive context, 3570 // don't diagnose. 3571 if (Sel == Sema::AbstractNone) return; 3572 3573 // Check whether the type matches the abstract type. 3574 QualType T = TL.getType(); 3575 if (T->isArrayType()) { 3576 Sel = Sema::AbstractArrayType; 3577 T = Info.S.Context.getBaseElementType(T); 3578 } 3579 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3580 if (CT != Info.AbstractType) return; 3581 3582 // It matched; do some magic. 3583 if (Sel == Sema::AbstractArrayType) { 3584 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3585 << T << TL.getSourceRange(); 3586 } else { 3587 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3588 << Sel << T << TL.getSourceRange(); 3589 } 3590 Info.DiagnoseAbstractType(); 3591 } 3592}; 3593 3594void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3595 Sema::AbstractDiagSelID Sel) { 3596 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3597} 3598 3599} 3600 3601/// Check for invalid uses of an abstract type in a method declaration. 3602static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3603 CXXMethodDecl *MD) { 3604 // No need to do the check on definitions, which require that 3605 // the return/param types be complete. 3606 if (MD->doesThisDeclarationHaveABody()) 3607 return; 3608 3609 // For safety's sake, just ignore it if we don't have type source 3610 // information. This should never happen for non-implicit methods, 3611 // but... 3612 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3613 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3614} 3615 3616/// Check for invalid uses of an abstract type within a class definition. 3617static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3618 CXXRecordDecl *RD) { 3619 for (CXXRecordDecl::decl_iterator 3620 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3621 Decl *D = *I; 3622 if (D->isImplicit()) continue; 3623 3624 // Methods and method templates. 3625 if (isa<CXXMethodDecl>(D)) { 3626 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3627 } else if (isa<FunctionTemplateDecl>(D)) { 3628 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3629 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3630 3631 // Fields and static variables. 3632 } else if (isa<FieldDecl>(D)) { 3633 FieldDecl *FD = cast<FieldDecl>(D); 3634 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3635 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3636 } else if (isa<VarDecl>(D)) { 3637 VarDecl *VD = cast<VarDecl>(D); 3638 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3639 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3640 3641 // Nested classes and class templates. 3642 } else if (isa<CXXRecordDecl>(D)) { 3643 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3644 } else if (isa<ClassTemplateDecl>(D)) { 3645 CheckAbstractClassUsage(Info, 3646 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3647 } 3648 } 3649} 3650 3651/// \brief Perform semantic checks on a class definition that has been 3652/// completing, introducing implicitly-declared members, checking for 3653/// abstract types, etc. 3654void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3655 if (!Record) 3656 return; 3657 3658 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3659 AbstractUsageInfo Info(*this, Record); 3660 CheckAbstractClassUsage(Info, Record); 3661 } 3662 3663 // If this is not an aggregate type and has no user-declared constructor, 3664 // complain about any non-static data members of reference or const scalar 3665 // type, since they will never get initializers. 3666 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3667 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 3668 !Record->isLambda()) { 3669 bool Complained = false; 3670 for (RecordDecl::field_iterator F = Record->field_begin(), 3671 FEnd = Record->field_end(); 3672 F != FEnd; ++F) { 3673 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3674 continue; 3675 3676 if (F->getType()->isReferenceType() || 3677 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3678 if (!Complained) { 3679 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3680 << Record->getTagKind() << Record; 3681 Complained = true; 3682 } 3683 3684 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3685 << F->getType()->isReferenceType() 3686 << F->getDeclName(); 3687 } 3688 } 3689 } 3690 3691 if (Record->isDynamicClass() && !Record->isDependentType()) 3692 DynamicClasses.push_back(Record); 3693 3694 if (Record->getIdentifier()) { 3695 // C++ [class.mem]p13: 3696 // If T is the name of a class, then each of the following shall have a 3697 // name different from T: 3698 // - every member of every anonymous union that is a member of class T. 3699 // 3700 // C++ [class.mem]p14: 3701 // In addition, if class T has a user-declared constructor (12.1), every 3702 // non-static data member of class T shall have a name different from T. 3703 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3704 R.first != R.second; ++R.first) { 3705 NamedDecl *D = *R.first; 3706 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3707 isa<IndirectFieldDecl>(D)) { 3708 Diag(D->getLocation(), diag::err_member_name_of_class) 3709 << D->getDeclName(); 3710 break; 3711 } 3712 } 3713 } 3714 3715 // Warn if the class has virtual methods but non-virtual public destructor. 3716 if (Record->isPolymorphic() && !Record->isDependentType()) { 3717 CXXDestructorDecl *dtor = Record->getDestructor(); 3718 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3719 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3720 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3721 } 3722 3723 // See if a method overloads virtual methods in a base 3724 /// class without overriding any. 3725 if (!Record->isDependentType()) { 3726 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3727 MEnd = Record->method_end(); 3728 M != MEnd; ++M) { 3729 if (!(*M)->isStatic()) 3730 DiagnoseHiddenVirtualMethods(Record, *M); 3731 } 3732 } 3733 3734 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3735 // function that is not a constructor declares that member function to be 3736 // const. [...] The class of which that function is a member shall be 3737 // a literal type. 3738 // 3739 // If the class has virtual bases, any constexpr members will already have 3740 // been diagnosed by the checks performed on the member declaration, so 3741 // suppress this (less useful) diagnostic. 3742 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3743 !Record->isLiteral() && !Record->getNumVBases()) { 3744 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3745 MEnd = Record->method_end(); 3746 M != MEnd; ++M) { 3747 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 3748 switch (Record->getTemplateSpecializationKind()) { 3749 case TSK_ImplicitInstantiation: 3750 case TSK_ExplicitInstantiationDeclaration: 3751 case TSK_ExplicitInstantiationDefinition: 3752 // If a template instantiates to a non-literal type, but its members 3753 // instantiate to constexpr functions, the template is technically 3754 // ill-formed, but we allow it for sanity. 3755 continue; 3756 3757 case TSK_Undeclared: 3758 case TSK_ExplicitSpecialization: 3759 RequireLiteralType((*M)->getLocation(), Context.getRecordType(Record), 3760 PDiag(diag::err_constexpr_method_non_literal)); 3761 break; 3762 } 3763 3764 // Only produce one error per class. 3765 break; 3766 } 3767 } 3768 } 3769 3770 // Declare inherited constructors. We do this eagerly here because: 3771 // - The standard requires an eager diagnostic for conflicting inherited 3772 // constructors from different classes. 3773 // - The lazy declaration of the other implicit constructors is so as to not 3774 // waste space and performance on classes that are not meant to be 3775 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3776 // have inherited constructors. 3777 DeclareInheritedConstructors(Record); 3778 3779 if (!Record->isDependentType()) 3780 CheckExplicitlyDefaultedMethods(Record); 3781} 3782 3783void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3784 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3785 ME = Record->method_end(); 3786 MI != ME; ++MI) { 3787 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3788 switch (getSpecialMember(*MI)) { 3789 case CXXDefaultConstructor: 3790 CheckExplicitlyDefaultedDefaultConstructor( 3791 cast<CXXConstructorDecl>(*MI)); 3792 break; 3793 3794 case CXXDestructor: 3795 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3796 break; 3797 3798 case CXXCopyConstructor: 3799 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3800 break; 3801 3802 case CXXCopyAssignment: 3803 CheckExplicitlyDefaultedCopyAssignment(*MI); 3804 break; 3805 3806 case CXXMoveConstructor: 3807 CheckExplicitlyDefaultedMoveConstructor(cast<CXXConstructorDecl>(*MI)); 3808 break; 3809 3810 case CXXMoveAssignment: 3811 CheckExplicitlyDefaultedMoveAssignment(*MI); 3812 break; 3813 3814 case CXXInvalid: 3815 llvm_unreachable("non-special member explicitly defaulted!"); 3816 } 3817 } 3818 } 3819 3820} 3821 3822void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3823 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3824 3825 // Whether this was the first-declared instance of the constructor. 3826 // This affects whether we implicitly add an exception spec (and, eventually, 3827 // constexpr). It is also ill-formed to explicitly default a constructor such 3828 // that it would be deleted. (C++0x [decl.fct.def.default]) 3829 bool First = CD == CD->getCanonicalDecl(); 3830 3831 bool HadError = false; 3832 if (CD->getNumParams() != 0) { 3833 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3834 << CD->getSourceRange(); 3835 HadError = true; 3836 } 3837 3838 ImplicitExceptionSpecification Spec 3839 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3840 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3841 if (EPI.ExceptionSpecType == EST_Delayed) { 3842 // Exception specification depends on some deferred part of the class. We'll 3843 // try again when the class's definition has been fully processed. 3844 return; 3845 } 3846 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3847 *ExceptionType = Context.getFunctionType( 3848 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3849 3850 // C++11 [dcl.fct.def.default]p2: 3851 // An explicitly-defaulted function may be declared constexpr only if it 3852 // would have been implicitly declared as constexpr, 3853 // Do not apply this rule to templates, since core issue 1358 makes such 3854 // functions always instantiate to constexpr functions. 3855 if (CD->isConstexpr() && 3856 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 3857 if (!CD->getParent()->defaultedDefaultConstructorIsConstexpr()) { 3858 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3859 << CXXDefaultConstructor; 3860 HadError = true; 3861 } 3862 } 3863 // and may have an explicit exception-specification only if it is compatible 3864 // with the exception-specification on the implicit declaration. 3865 if (CtorType->hasExceptionSpec()) { 3866 if (CheckEquivalentExceptionSpec( 3867 PDiag(diag::err_incorrect_defaulted_exception_spec) 3868 << CXXDefaultConstructor, 3869 PDiag(), 3870 ExceptionType, SourceLocation(), 3871 CtorType, CD->getLocation())) { 3872 HadError = true; 3873 } 3874 } 3875 3876 // If a function is explicitly defaulted on its first declaration, 3877 if (First) { 3878 // -- it is implicitly considered to be constexpr if the implicit 3879 // definition would be, 3880 CD->setConstexpr(CD->getParent()->defaultedDefaultConstructorIsConstexpr()); 3881 3882 // -- it is implicitly considered to have the same 3883 // exception-specification as if it had been implicitly declared 3884 // 3885 // FIXME: a compatible, but different, explicit exception specification 3886 // will be silently overridden. We should issue a warning if this happens. 3887 EPI.ExtInfo = CtorType->getExtInfo(); 3888 3889 // Such a function is also trivial if the implicitly-declared function 3890 // would have been. 3891 CD->setTrivial(CD->getParent()->hasTrivialDefaultConstructor()); 3892 } 3893 3894 if (HadError) { 3895 CD->setInvalidDecl(); 3896 return; 3897 } 3898 3899 if (ShouldDeleteSpecialMember(CD, CXXDefaultConstructor)) { 3900 if (First) { 3901 CD->setDeletedAsWritten(); 3902 } else { 3903 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3904 << CXXDefaultConstructor; 3905 CD->setInvalidDecl(); 3906 } 3907 } 3908} 3909 3910void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3911 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3912 3913 // Whether this was the first-declared instance of the constructor. 3914 bool First = CD == CD->getCanonicalDecl(); 3915 3916 bool HadError = false; 3917 if (CD->getNumParams() != 1) { 3918 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3919 << CD->getSourceRange(); 3920 HadError = true; 3921 } 3922 3923 ImplicitExceptionSpecification Spec(Context); 3924 bool Const; 3925 llvm::tie(Spec, Const) = 3926 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3927 3928 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3929 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3930 *ExceptionType = Context.getFunctionType( 3931 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3932 3933 // Check for parameter type matching. 3934 // This is a copy ctor so we know it's a cv-qualified reference to T. 3935 QualType ArgType = CtorType->getArgType(0); 3936 if (ArgType->getPointeeType().isVolatileQualified()) { 3937 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3938 HadError = true; 3939 } 3940 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3941 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3942 HadError = true; 3943 } 3944 3945 // C++11 [dcl.fct.def.default]p2: 3946 // An explicitly-defaulted function may be declared constexpr only if it 3947 // would have been implicitly declared as constexpr, 3948 // Do not apply this rule to templates, since core issue 1358 makes such 3949 // functions always instantiate to constexpr functions. 3950 if (CD->isConstexpr() && 3951 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 3952 if (!CD->getParent()->defaultedCopyConstructorIsConstexpr()) { 3953 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3954 << CXXCopyConstructor; 3955 HadError = true; 3956 } 3957 } 3958 // and may have an explicit exception-specification only if it is compatible 3959 // with the exception-specification on the implicit declaration. 3960 if (CtorType->hasExceptionSpec()) { 3961 if (CheckEquivalentExceptionSpec( 3962 PDiag(diag::err_incorrect_defaulted_exception_spec) 3963 << CXXCopyConstructor, 3964 PDiag(), 3965 ExceptionType, SourceLocation(), 3966 CtorType, CD->getLocation())) { 3967 HadError = true; 3968 } 3969 } 3970 3971 // If a function is explicitly defaulted on its first declaration, 3972 if (First) { 3973 // -- it is implicitly considered to be constexpr if the implicit 3974 // definition would be, 3975 CD->setConstexpr(CD->getParent()->defaultedCopyConstructorIsConstexpr()); 3976 3977 // -- it is implicitly considered to have the same 3978 // exception-specification as if it had been implicitly declared, and 3979 // 3980 // FIXME: a compatible, but different, explicit exception specification 3981 // will be silently overridden. We should issue a warning if this happens. 3982 EPI.ExtInfo = CtorType->getExtInfo(); 3983 3984 // -- [...] it shall have the same parameter type as if it had been 3985 // implicitly declared. 3986 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3987 3988 // Such a function is also trivial if the implicitly-declared function 3989 // would have been. 3990 CD->setTrivial(CD->getParent()->hasTrivialCopyConstructor()); 3991 } 3992 3993 if (HadError) { 3994 CD->setInvalidDecl(); 3995 return; 3996 } 3997 3998 if (ShouldDeleteSpecialMember(CD, CXXCopyConstructor)) { 3999 if (First) { 4000 CD->setDeletedAsWritten(); 4001 } else { 4002 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 4003 << CXXCopyConstructor; 4004 CD->setInvalidDecl(); 4005 } 4006 } 4007} 4008 4009void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 4010 assert(MD->isExplicitlyDefaulted()); 4011 4012 // Whether this was the first-declared instance of the operator 4013 bool First = MD == MD->getCanonicalDecl(); 4014 4015 bool HadError = false; 4016 if (MD->getNumParams() != 1) { 4017 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 4018 << MD->getSourceRange(); 4019 HadError = true; 4020 } 4021 4022 QualType ReturnType = 4023 MD->getType()->getAs<FunctionType>()->getResultType(); 4024 if (!ReturnType->isLValueReferenceType() || 4025 !Context.hasSameType( 4026 Context.getCanonicalType(ReturnType->getPointeeType()), 4027 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 4028 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 4029 HadError = true; 4030 } 4031 4032 ImplicitExceptionSpecification Spec(Context); 4033 bool Const; 4034 llvm::tie(Spec, Const) = 4035 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 4036 4037 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4038 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4039 *ExceptionType = Context.getFunctionType( 4040 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4041 4042 QualType ArgType = OperType->getArgType(0); 4043 if (!ArgType->isLValueReferenceType()) { 4044 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4045 HadError = true; 4046 } else { 4047 if (ArgType->getPointeeType().isVolatileQualified()) { 4048 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 4049 HadError = true; 4050 } 4051 if (ArgType->getPointeeType().isConstQualified() && !Const) { 4052 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 4053 HadError = true; 4054 } 4055 } 4056 4057 if (OperType->getTypeQuals()) { 4058 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 4059 HadError = true; 4060 } 4061 4062 if (OperType->hasExceptionSpec()) { 4063 if (CheckEquivalentExceptionSpec( 4064 PDiag(diag::err_incorrect_defaulted_exception_spec) 4065 << CXXCopyAssignment, 4066 PDiag(), 4067 ExceptionType, SourceLocation(), 4068 OperType, MD->getLocation())) { 4069 HadError = true; 4070 } 4071 } 4072 if (First) { 4073 // We set the declaration to have the computed exception spec here. 4074 // We duplicate the one parameter type. 4075 EPI.RefQualifier = OperType->getRefQualifier(); 4076 EPI.ExtInfo = OperType->getExtInfo(); 4077 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4078 4079 // Such a function is also trivial if the implicitly-declared function 4080 // would have been. 4081 MD->setTrivial(MD->getParent()->hasTrivialCopyAssignment()); 4082 } 4083 4084 if (HadError) { 4085 MD->setInvalidDecl(); 4086 return; 4087 } 4088 4089 if (ShouldDeleteSpecialMember(MD, CXXCopyAssignment)) { 4090 if (First) { 4091 MD->setDeletedAsWritten(); 4092 } else { 4093 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4094 << CXXCopyAssignment; 4095 MD->setInvalidDecl(); 4096 } 4097 } 4098} 4099 4100void Sema::CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *CD) { 4101 assert(CD->isExplicitlyDefaulted() && CD->isMoveConstructor()); 4102 4103 // Whether this was the first-declared instance of the constructor. 4104 bool First = CD == CD->getCanonicalDecl(); 4105 4106 bool HadError = false; 4107 if (CD->getNumParams() != 1) { 4108 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_params) 4109 << CD->getSourceRange(); 4110 HadError = true; 4111 } 4112 4113 ImplicitExceptionSpecification Spec( 4114 ComputeDefaultedMoveCtorExceptionSpec(CD->getParent())); 4115 4116 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4117 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 4118 *ExceptionType = Context.getFunctionType( 4119 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4120 4121 // Check for parameter type matching. 4122 // This is a move ctor so we know it's a cv-qualified rvalue reference to T. 4123 QualType ArgType = CtorType->getArgType(0); 4124 if (ArgType->getPointeeType().isVolatileQualified()) { 4125 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_volatile_param); 4126 HadError = true; 4127 } 4128 if (ArgType->getPointeeType().isConstQualified()) { 4129 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_const_param); 4130 HadError = true; 4131 } 4132 4133 // C++11 [dcl.fct.def.default]p2: 4134 // An explicitly-defaulted function may be declared constexpr only if it 4135 // would have been implicitly declared as constexpr, 4136 // Do not apply this rule to templates, since core issue 1358 makes such 4137 // functions always instantiate to constexpr functions. 4138 if (CD->isConstexpr() && 4139 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4140 if (!CD->getParent()->defaultedMoveConstructorIsConstexpr()) { 4141 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 4142 << CXXMoveConstructor; 4143 HadError = true; 4144 } 4145 } 4146 // and may have an explicit exception-specification only if it is compatible 4147 // with the exception-specification on the implicit declaration. 4148 if (CtorType->hasExceptionSpec()) { 4149 if (CheckEquivalentExceptionSpec( 4150 PDiag(diag::err_incorrect_defaulted_exception_spec) 4151 << CXXMoveConstructor, 4152 PDiag(), 4153 ExceptionType, SourceLocation(), 4154 CtorType, CD->getLocation())) { 4155 HadError = true; 4156 } 4157 } 4158 4159 // If a function is explicitly defaulted on its first declaration, 4160 if (First) { 4161 // -- it is implicitly considered to be constexpr if the implicit 4162 // definition would be, 4163 CD->setConstexpr(CD->getParent()->defaultedMoveConstructorIsConstexpr()); 4164 4165 // -- it is implicitly considered to have the same 4166 // exception-specification as if it had been implicitly declared, and 4167 // 4168 // FIXME: a compatible, but different, explicit exception specification 4169 // will be silently overridden. We should issue a warning if this happens. 4170 EPI.ExtInfo = CtorType->getExtInfo(); 4171 4172 // -- [...] it shall have the same parameter type as if it had been 4173 // implicitly declared. 4174 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 4175 4176 // Such a function is also trivial if the implicitly-declared function 4177 // would have been. 4178 CD->setTrivial(CD->getParent()->hasTrivialMoveConstructor()); 4179 } 4180 4181 if (HadError) { 4182 CD->setInvalidDecl(); 4183 return; 4184 } 4185 4186 if (ShouldDeleteSpecialMember(CD, CXXMoveConstructor)) { 4187 if (First) { 4188 CD->setDeletedAsWritten(); 4189 } else { 4190 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 4191 << CXXMoveConstructor; 4192 CD->setInvalidDecl(); 4193 } 4194 } 4195} 4196 4197void Sema::CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *MD) { 4198 assert(MD->isExplicitlyDefaulted()); 4199 4200 // Whether this was the first-declared instance of the operator 4201 bool First = MD == MD->getCanonicalDecl(); 4202 4203 bool HadError = false; 4204 if (MD->getNumParams() != 1) { 4205 Diag(MD->getLocation(), diag::err_defaulted_move_assign_params) 4206 << MD->getSourceRange(); 4207 HadError = true; 4208 } 4209 4210 QualType ReturnType = 4211 MD->getType()->getAs<FunctionType>()->getResultType(); 4212 if (!ReturnType->isLValueReferenceType() || 4213 !Context.hasSameType( 4214 Context.getCanonicalType(ReturnType->getPointeeType()), 4215 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 4216 Diag(MD->getLocation(), diag::err_defaulted_move_assign_return_type); 4217 HadError = true; 4218 } 4219 4220 ImplicitExceptionSpecification Spec( 4221 ComputeDefaultedMoveCtorExceptionSpec(MD->getParent())); 4222 4223 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4224 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4225 *ExceptionType = Context.getFunctionType( 4226 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4227 4228 QualType ArgType = OperType->getArgType(0); 4229 if (!ArgType->isRValueReferenceType()) { 4230 Diag(MD->getLocation(), diag::err_defaulted_move_assign_not_ref); 4231 HadError = true; 4232 } else { 4233 if (ArgType->getPointeeType().isVolatileQualified()) { 4234 Diag(MD->getLocation(), diag::err_defaulted_move_assign_volatile_param); 4235 HadError = true; 4236 } 4237 if (ArgType->getPointeeType().isConstQualified()) { 4238 Diag(MD->getLocation(), diag::err_defaulted_move_assign_const_param); 4239 HadError = true; 4240 } 4241 } 4242 4243 if (OperType->getTypeQuals()) { 4244 Diag(MD->getLocation(), diag::err_defaulted_move_assign_quals); 4245 HadError = true; 4246 } 4247 4248 if (OperType->hasExceptionSpec()) { 4249 if (CheckEquivalentExceptionSpec( 4250 PDiag(diag::err_incorrect_defaulted_exception_spec) 4251 << CXXMoveAssignment, 4252 PDiag(), 4253 ExceptionType, SourceLocation(), 4254 OperType, MD->getLocation())) { 4255 HadError = true; 4256 } 4257 } 4258 if (First) { 4259 // We set the declaration to have the computed exception spec here. 4260 // We duplicate the one parameter type. 4261 EPI.RefQualifier = OperType->getRefQualifier(); 4262 EPI.ExtInfo = OperType->getExtInfo(); 4263 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4264 4265 // Such a function is also trivial if the implicitly-declared function 4266 // would have been. 4267 MD->setTrivial(MD->getParent()->hasTrivialMoveAssignment()); 4268 } 4269 4270 if (HadError) { 4271 MD->setInvalidDecl(); 4272 return; 4273 } 4274 4275 if (ShouldDeleteSpecialMember(MD, CXXMoveAssignment)) { 4276 if (First) { 4277 MD->setDeletedAsWritten(); 4278 } else { 4279 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4280 << CXXMoveAssignment; 4281 MD->setInvalidDecl(); 4282 } 4283 } 4284} 4285 4286void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 4287 assert(DD->isExplicitlyDefaulted()); 4288 4289 // Whether this was the first-declared instance of the destructor. 4290 bool First = DD == DD->getCanonicalDecl(); 4291 4292 ImplicitExceptionSpecification Spec 4293 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 4294 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4295 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 4296 *ExceptionType = Context.getFunctionType( 4297 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4298 4299 if (DtorType->hasExceptionSpec()) { 4300 if (CheckEquivalentExceptionSpec( 4301 PDiag(diag::err_incorrect_defaulted_exception_spec) 4302 << CXXDestructor, 4303 PDiag(), 4304 ExceptionType, SourceLocation(), 4305 DtorType, DD->getLocation())) { 4306 DD->setInvalidDecl(); 4307 return; 4308 } 4309 } 4310 if (First) { 4311 // We set the declaration to have the computed exception spec here. 4312 // There are no parameters. 4313 EPI.ExtInfo = DtorType->getExtInfo(); 4314 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 4315 4316 // Such a function is also trivial if the implicitly-declared function 4317 // would have been. 4318 DD->setTrivial(DD->getParent()->hasTrivialDestructor()); 4319 } 4320 4321 if (ShouldDeleteSpecialMember(DD, CXXDestructor)) { 4322 if (First) { 4323 DD->setDeletedAsWritten(); 4324 } else { 4325 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 4326 << CXXDestructor; 4327 DD->setInvalidDecl(); 4328 } 4329 } 4330} 4331 4332namespace { 4333struct SpecialMemberDeletionInfo { 4334 Sema &S; 4335 CXXMethodDecl *MD; 4336 Sema::CXXSpecialMember CSM; 4337 bool Diagnose; 4338 4339 // Properties of the special member, computed for convenience. 4340 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4341 SourceLocation Loc; 4342 4343 bool AllFieldsAreConst; 4344 4345 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4346 Sema::CXXSpecialMember CSM, bool Diagnose) 4347 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose), 4348 IsConstructor(false), IsAssignment(false), IsMove(false), 4349 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4350 AllFieldsAreConst(true) { 4351 switch (CSM) { 4352 case Sema::CXXDefaultConstructor: 4353 case Sema::CXXCopyConstructor: 4354 IsConstructor = true; 4355 break; 4356 case Sema::CXXMoveConstructor: 4357 IsConstructor = true; 4358 IsMove = true; 4359 break; 4360 case Sema::CXXCopyAssignment: 4361 IsAssignment = true; 4362 break; 4363 case Sema::CXXMoveAssignment: 4364 IsAssignment = true; 4365 IsMove = true; 4366 break; 4367 case Sema::CXXDestructor: 4368 break; 4369 case Sema::CXXInvalid: 4370 llvm_unreachable("invalid special member kind"); 4371 } 4372 4373 if (MD->getNumParams()) { 4374 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4375 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4376 } 4377 } 4378 4379 bool inUnion() const { return MD->getParent()->isUnion(); } 4380 4381 /// Look up the corresponding special member in the given class. 4382 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class) { 4383 unsigned TQ = MD->getTypeQualifiers(); 4384 return S.LookupSpecialMember(Class, CSM, ConstArg, VolatileArg, 4385 MD->getRefQualifier() == RQ_RValue, 4386 TQ & Qualifiers::Const, 4387 TQ & Qualifiers::Volatile); 4388 } 4389 4390 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; 4391 4392 bool shouldDeleteForBase(CXXBaseSpecifier *Base); 4393 bool shouldDeleteForField(FieldDecl *FD); 4394 bool shouldDeleteForAllConstMembers(); 4395 4396 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj); 4397 bool shouldDeleteForSubobjectCall(Subobject Subobj, 4398 Sema::SpecialMemberOverloadResult *SMOR, 4399 bool IsDtorCallInCtor); 4400}; 4401} 4402 4403/// Check whether we should delete a special member due to the implicit 4404/// definition containing a call to a special member of a subobject. 4405bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( 4406 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR, 4407 bool IsDtorCallInCtor) { 4408 CXXMethodDecl *Decl = SMOR->getMethod(); 4409 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4410 4411 int DiagKind = -1; 4412 4413 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) 4414 DiagKind = !Decl ? 0 : 1; 4415 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4416 DiagKind = 2; 4417 else if (S.CheckDirectMemberAccess(Loc, Decl, S.PDiag()) 4418 != Sema::AR_accessible) 4419 DiagKind = 3; 4420 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && 4421 !Decl->isTrivial()) { 4422 // A member of a union must have a trivial corresponding special member. 4423 // As a weird special case, a destructor call from a union's constructor 4424 // must be accessible and non-deleted, but need not be trivial. Such a 4425 // destructor is never actually called, but is semantically checked as 4426 // if it were. 4427 DiagKind = 4; 4428 } 4429 4430 if (DiagKind == -1) 4431 return false; 4432 4433 if (Diagnose) { 4434 if (Field) { 4435 S.Diag(Field->getLocation(), 4436 diag::note_deleted_special_member_class_subobject) 4437 << CSM << MD->getParent() << /*IsField*/true 4438 << Field << DiagKind << IsDtorCallInCtor; 4439 } else { 4440 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); 4441 S.Diag(Base->getLocStart(), 4442 diag::note_deleted_special_member_class_subobject) 4443 << CSM << MD->getParent() << /*IsField*/false 4444 << Base->getType() << DiagKind << IsDtorCallInCtor; 4445 } 4446 4447 if (DiagKind == 1) 4448 S.NoteDeletedFunction(Decl); 4449 // FIXME: Explain inaccessibility if DiagKind == 3. 4450 } 4451 4452 return true; 4453} 4454 4455/// Check whether we should delete a special member function due to having a 4456/// direct or virtual base class or static data member of class type M. 4457bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 4458 CXXRecordDecl *Class, Subobject Subobj) { 4459 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4460 4461 // C++11 [class.ctor]p5: 4462 // -- any direct or virtual base class, or non-static data member with no 4463 // brace-or-equal-initializer, has class type M (or array thereof) and 4464 // either M has no default constructor or overload resolution as applied 4465 // to M's default constructor results in an ambiguity or in a function 4466 // that is deleted or inaccessible 4467 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4468 // -- a direct or virtual base class B that cannot be copied/moved because 4469 // overload resolution, as applied to B's corresponding special member, 4470 // results in an ambiguity or a function that is deleted or inaccessible 4471 // from the defaulted special member 4472 // C++11 [class.dtor]p5: 4473 // -- any direct or virtual base class [...] has a type with a destructor 4474 // that is deleted or inaccessible 4475 if (!(CSM == Sema::CXXDefaultConstructor && 4476 Field && Field->hasInClassInitializer()) && 4477 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class), false)) 4478 return true; 4479 4480 // C++11 [class.ctor]p5, C++11 [class.copy]p11: 4481 // -- any direct or virtual base class or non-static data member has a 4482 // type with a destructor that is deleted or inaccessible 4483 if (IsConstructor) { 4484 Sema::SpecialMemberOverloadResult *SMOR = 4485 S.LookupSpecialMember(Class, Sema::CXXDestructor, 4486 false, false, false, false, false); 4487 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) 4488 return true; 4489 } 4490 4491 return false; 4492} 4493 4494/// Check whether we should delete a special member function due to the class 4495/// having a particular direct or virtual base class. 4496bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { 4497 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); 4498 return shouldDeleteForClassSubobject(BaseClass, Base); 4499} 4500 4501/// Check whether we should delete a special member function due to the class 4502/// having a particular non-static data member. 4503bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4504 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4505 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4506 4507 if (CSM == Sema::CXXDefaultConstructor) { 4508 // For a default constructor, all references must be initialized in-class 4509 // and, if a union, it must have a non-const member. 4510 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { 4511 if (Diagnose) 4512 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4513 << MD->getParent() << FD << FieldType << /*Reference*/0; 4514 return true; 4515 } 4516 // C++11 [class.ctor]p5: any non-variant non-static data member of 4517 // const-qualified type (or array thereof) with no 4518 // brace-or-equal-initializer does not have a user-provided default 4519 // constructor. 4520 if (!inUnion() && FieldType.isConstQualified() && 4521 !FD->hasInClassInitializer() && 4522 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { 4523 if (Diagnose) 4524 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4525 << MD->getParent() << FD << FieldType << /*Const*/1; 4526 return true; 4527 } 4528 4529 if (inUnion() && !FieldType.isConstQualified()) 4530 AllFieldsAreConst = false; 4531 } else if (CSM == Sema::CXXCopyConstructor) { 4532 // For a copy constructor, data members must not be of rvalue reference 4533 // type. 4534 if (FieldType->isRValueReferenceType()) { 4535 if (Diagnose) 4536 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) 4537 << MD->getParent() << FD << FieldType; 4538 return true; 4539 } 4540 } else if (IsAssignment) { 4541 // For an assignment operator, data members must not be of reference type. 4542 if (FieldType->isReferenceType()) { 4543 if (Diagnose) 4544 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4545 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0; 4546 return true; 4547 } 4548 if (!FieldRecord && FieldType.isConstQualified()) { 4549 // C++11 [class.copy]p23: 4550 // -- a non-static data member of const non-class type (or array thereof) 4551 if (Diagnose) 4552 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4553 << IsMove << MD->getParent() << FD << FieldType << /*Const*/1; 4554 return true; 4555 } 4556 } 4557 4558 if (FieldRecord) { 4559 // Some additional restrictions exist on the variant members. 4560 if (!inUnion() && FieldRecord->isUnion() && 4561 FieldRecord->isAnonymousStructOrUnion()) { 4562 bool AllVariantFieldsAreConst = true; 4563 4564 // FIXME: Handle anonymous unions declared within anonymous unions. 4565 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4566 UE = FieldRecord->field_end(); 4567 UI != UE; ++UI) { 4568 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4569 4570 if (!UnionFieldType.isConstQualified()) 4571 AllVariantFieldsAreConst = false; 4572 4573 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 4574 if (UnionFieldRecord && 4575 shouldDeleteForClassSubobject(UnionFieldRecord, *UI)) 4576 return true; 4577 } 4578 4579 // At least one member in each anonymous union must be non-const 4580 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 4581 FieldRecord->field_begin() != FieldRecord->field_end()) { 4582 if (Diagnose) 4583 S.Diag(FieldRecord->getLocation(), 4584 diag::note_deleted_default_ctor_all_const) 4585 << MD->getParent() << /*anonymous union*/1; 4586 return true; 4587 } 4588 4589 // Don't check the implicit member of the anonymous union type. 4590 // This is technically non-conformant, but sanity demands it. 4591 return false; 4592 } 4593 4594 if (shouldDeleteForClassSubobject(FieldRecord, FD)) 4595 return true; 4596 } 4597 4598 return false; 4599} 4600 4601/// C++11 [class.ctor] p5: 4602/// A defaulted default constructor for a class X is defined as deleted if 4603/// X is a union and all of its variant members are of const-qualified type. 4604bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4605 // This is a silly definition, because it gives an empty union a deleted 4606 // default constructor. Don't do that. 4607 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 4608 (MD->getParent()->field_begin() != MD->getParent()->field_end())) { 4609 if (Diagnose) 4610 S.Diag(MD->getParent()->getLocation(), 4611 diag::note_deleted_default_ctor_all_const) 4612 << MD->getParent() << /*not anonymous union*/0; 4613 return true; 4614 } 4615 return false; 4616} 4617 4618/// Determine whether a defaulted special member function should be defined as 4619/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4620/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4621bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, 4622 bool Diagnose) { 4623 assert(!MD->isInvalidDecl()); 4624 CXXRecordDecl *RD = MD->getParent(); 4625 assert(!RD->isDependentType() && "do deletion after instantiation"); 4626 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4627 return false; 4628 4629 // C++11 [expr.lambda.prim]p19: 4630 // The closure type associated with a lambda-expression has a 4631 // deleted (8.4.3) default constructor and a deleted copy 4632 // assignment operator. 4633 if (RD->isLambda() && 4634 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { 4635 if (Diagnose) 4636 Diag(RD->getLocation(), diag::note_lambda_decl); 4637 return true; 4638 } 4639 4640 // For an anonymous struct or union, the copy and assignment special members 4641 // will never be used, so skip the check. For an anonymous union declared at 4642 // namespace scope, the constructor and destructor are used. 4643 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4644 RD->isAnonymousStructOrUnion()) 4645 return false; 4646 4647 // C++11 [class.copy]p7, p18: 4648 // If the class definition declares a move constructor or move assignment 4649 // operator, an implicitly declared copy constructor or copy assignment 4650 // operator is defined as deleted. 4651 if (MD->isImplicit() && 4652 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { 4653 CXXMethodDecl *UserDeclaredMove = 0; 4654 4655 // In Microsoft mode, a user-declared move only causes the deletion of the 4656 // corresponding copy operation, not both copy operations. 4657 if (RD->hasUserDeclaredMoveConstructor() && 4658 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) { 4659 if (!Diagnose) return true; 4660 UserDeclaredMove = RD->getMoveConstructor(); 4661 assert(UserDeclaredMove); 4662 } else if (RD->hasUserDeclaredMoveAssignment() && 4663 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) { 4664 if (!Diagnose) return true; 4665 UserDeclaredMove = RD->getMoveAssignmentOperator(); 4666 assert(UserDeclaredMove); 4667 } 4668 4669 if (UserDeclaredMove) { 4670 Diag(UserDeclaredMove->getLocation(), 4671 diag::note_deleted_copy_user_declared_move) 4672 << (CSM == CXXCopyAssignment) << RD 4673 << UserDeclaredMove->isMoveAssignmentOperator(); 4674 return true; 4675 } 4676 } 4677 4678 // Do access control from the special member function 4679 ContextRAII MethodContext(*this, MD); 4680 4681 // C++11 [class.dtor]p5: 4682 // -- for a virtual destructor, lookup of the non-array deallocation function 4683 // results in an ambiguity or in a function that is deleted or inaccessible 4684 if (CSM == CXXDestructor && MD->isVirtual()) { 4685 FunctionDecl *OperatorDelete = 0; 4686 DeclarationName Name = 4687 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4688 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 4689 OperatorDelete, false)) { 4690 if (Diagnose) 4691 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); 4692 return true; 4693 } 4694 } 4695 4696 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose); 4697 4698 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4699 BE = RD->bases_end(); BI != BE; ++BI) 4700 if (!BI->isVirtual() && 4701 SMI.shouldDeleteForBase(BI)) 4702 return true; 4703 4704 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4705 BE = RD->vbases_end(); BI != BE; ++BI) 4706 if (SMI.shouldDeleteForBase(BI)) 4707 return true; 4708 4709 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4710 FE = RD->field_end(); FI != FE; ++FI) 4711 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 4712 SMI.shouldDeleteForField(*FI)) 4713 return true; 4714 4715 if (SMI.shouldDeleteForAllConstMembers()) 4716 return true; 4717 4718 return false; 4719} 4720 4721/// \brief Data used with FindHiddenVirtualMethod 4722namespace { 4723 struct FindHiddenVirtualMethodData { 4724 Sema *S; 4725 CXXMethodDecl *Method; 4726 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4727 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4728 }; 4729} 4730 4731/// \brief Member lookup function that determines whether a given C++ 4732/// method overloads virtual methods in a base class without overriding any, 4733/// to be used with CXXRecordDecl::lookupInBases(). 4734static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4735 CXXBasePath &Path, 4736 void *UserData) { 4737 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4738 4739 FindHiddenVirtualMethodData &Data 4740 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4741 4742 DeclarationName Name = Data.Method->getDeclName(); 4743 assert(Name.getNameKind() == DeclarationName::Identifier); 4744 4745 bool foundSameNameMethod = false; 4746 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4747 for (Path.Decls = BaseRecord->lookup(Name); 4748 Path.Decls.first != Path.Decls.second; 4749 ++Path.Decls.first) { 4750 NamedDecl *D = *Path.Decls.first; 4751 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4752 MD = MD->getCanonicalDecl(); 4753 foundSameNameMethod = true; 4754 // Interested only in hidden virtual methods. 4755 if (!MD->isVirtual()) 4756 continue; 4757 // If the method we are checking overrides a method from its base 4758 // don't warn about the other overloaded methods. 4759 if (!Data.S->IsOverload(Data.Method, MD, false)) 4760 return true; 4761 // Collect the overload only if its hidden. 4762 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4763 overloadedMethods.push_back(MD); 4764 } 4765 } 4766 4767 if (foundSameNameMethod) 4768 Data.OverloadedMethods.append(overloadedMethods.begin(), 4769 overloadedMethods.end()); 4770 return foundSameNameMethod; 4771} 4772 4773/// \brief See if a method overloads virtual methods in a base class without 4774/// overriding any. 4775void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4776 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4777 MD->getLocation()) == DiagnosticsEngine::Ignored) 4778 return; 4779 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4780 return; 4781 4782 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4783 /*bool RecordPaths=*/false, 4784 /*bool DetectVirtual=*/false); 4785 FindHiddenVirtualMethodData Data; 4786 Data.Method = MD; 4787 Data.S = this; 4788 4789 // Keep the base methods that were overriden or introduced in the subclass 4790 // by 'using' in a set. A base method not in this set is hidden. 4791 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4792 res.first != res.second; ++res.first) { 4793 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4794 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4795 E = MD->end_overridden_methods(); 4796 I != E; ++I) 4797 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4798 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4799 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4800 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4801 } 4802 4803 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4804 !Data.OverloadedMethods.empty()) { 4805 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4806 << MD << (Data.OverloadedMethods.size() > 1); 4807 4808 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4809 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4810 Diag(overloadedMD->getLocation(), 4811 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4812 } 4813 } 4814} 4815 4816void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4817 Decl *TagDecl, 4818 SourceLocation LBrac, 4819 SourceLocation RBrac, 4820 AttributeList *AttrList) { 4821 if (!TagDecl) 4822 return; 4823 4824 AdjustDeclIfTemplate(TagDecl); 4825 4826 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4827 // strict aliasing violation! 4828 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4829 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4830 4831 CheckCompletedCXXClass( 4832 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4833} 4834 4835/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4836/// special functions, such as the default constructor, copy 4837/// constructor, or destructor, to the given C++ class (C++ 4838/// [special]p1). This routine can only be executed just before the 4839/// definition of the class is complete. 4840void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4841 if (!ClassDecl->hasUserDeclaredConstructor()) 4842 ++ASTContext::NumImplicitDefaultConstructors; 4843 4844 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4845 ++ASTContext::NumImplicitCopyConstructors; 4846 4847 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 4848 ++ASTContext::NumImplicitMoveConstructors; 4849 4850 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4851 ++ASTContext::NumImplicitCopyAssignmentOperators; 4852 4853 // If we have a dynamic class, then the copy assignment operator may be 4854 // virtual, so we have to declare it immediately. This ensures that, e.g., 4855 // it shows up in the right place in the vtable and that we diagnose 4856 // problems with the implicit exception specification. 4857 if (ClassDecl->isDynamicClass()) 4858 DeclareImplicitCopyAssignment(ClassDecl); 4859 } 4860 4861 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()) { 4862 ++ASTContext::NumImplicitMoveAssignmentOperators; 4863 4864 // Likewise for the move assignment operator. 4865 if (ClassDecl->isDynamicClass()) 4866 DeclareImplicitMoveAssignment(ClassDecl); 4867 } 4868 4869 if (!ClassDecl->hasUserDeclaredDestructor()) { 4870 ++ASTContext::NumImplicitDestructors; 4871 4872 // If we have a dynamic class, then the destructor may be virtual, so we 4873 // have to declare the destructor immediately. This ensures that, e.g., it 4874 // shows up in the right place in the vtable and that we diagnose problems 4875 // with the implicit exception specification. 4876 if (ClassDecl->isDynamicClass()) 4877 DeclareImplicitDestructor(ClassDecl); 4878 } 4879} 4880 4881void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4882 if (!D) 4883 return; 4884 4885 int NumParamList = D->getNumTemplateParameterLists(); 4886 for (int i = 0; i < NumParamList; i++) { 4887 TemplateParameterList* Params = D->getTemplateParameterList(i); 4888 for (TemplateParameterList::iterator Param = Params->begin(), 4889 ParamEnd = Params->end(); 4890 Param != ParamEnd; ++Param) { 4891 NamedDecl *Named = cast<NamedDecl>(*Param); 4892 if (Named->getDeclName()) { 4893 S->AddDecl(Named); 4894 IdResolver.AddDecl(Named); 4895 } 4896 } 4897 } 4898} 4899 4900void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4901 if (!D) 4902 return; 4903 4904 TemplateParameterList *Params = 0; 4905 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4906 Params = Template->getTemplateParameters(); 4907 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4908 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4909 Params = PartialSpec->getTemplateParameters(); 4910 else 4911 return; 4912 4913 for (TemplateParameterList::iterator Param = Params->begin(), 4914 ParamEnd = Params->end(); 4915 Param != ParamEnd; ++Param) { 4916 NamedDecl *Named = cast<NamedDecl>(*Param); 4917 if (Named->getDeclName()) { 4918 S->AddDecl(Named); 4919 IdResolver.AddDecl(Named); 4920 } 4921 } 4922} 4923 4924void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4925 if (!RecordD) return; 4926 AdjustDeclIfTemplate(RecordD); 4927 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4928 PushDeclContext(S, Record); 4929} 4930 4931void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4932 if (!RecordD) return; 4933 PopDeclContext(); 4934} 4935 4936/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4937/// parsing a top-level (non-nested) C++ class, and we are now 4938/// parsing those parts of the given Method declaration that could 4939/// not be parsed earlier (C++ [class.mem]p2), such as default 4940/// arguments. This action should enter the scope of the given 4941/// Method declaration as if we had just parsed the qualified method 4942/// name. However, it should not bring the parameters into scope; 4943/// that will be performed by ActOnDelayedCXXMethodParameter. 4944void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4945} 4946 4947/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4948/// C++ method declaration. We're (re-)introducing the given 4949/// function parameter into scope for use in parsing later parts of 4950/// the method declaration. For example, we could see an 4951/// ActOnParamDefaultArgument event for this parameter. 4952void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4953 if (!ParamD) 4954 return; 4955 4956 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4957 4958 // If this parameter has an unparsed default argument, clear it out 4959 // to make way for the parsed default argument. 4960 if (Param->hasUnparsedDefaultArg()) 4961 Param->setDefaultArg(0); 4962 4963 S->AddDecl(Param); 4964 if (Param->getDeclName()) 4965 IdResolver.AddDecl(Param); 4966} 4967 4968/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4969/// processing the delayed method declaration for Method. The method 4970/// declaration is now considered finished. There may be a separate 4971/// ActOnStartOfFunctionDef action later (not necessarily 4972/// immediately!) for this method, if it was also defined inside the 4973/// class body. 4974void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4975 if (!MethodD) 4976 return; 4977 4978 AdjustDeclIfTemplate(MethodD); 4979 4980 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4981 4982 // Now that we have our default arguments, check the constructor 4983 // again. It could produce additional diagnostics or affect whether 4984 // the class has implicitly-declared destructors, among other 4985 // things. 4986 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4987 CheckConstructor(Constructor); 4988 4989 // Check the default arguments, which we may have added. 4990 if (!Method->isInvalidDecl()) 4991 CheckCXXDefaultArguments(Method); 4992} 4993 4994/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4995/// the well-formedness of the constructor declarator @p D with type @p 4996/// R. If there are any errors in the declarator, this routine will 4997/// emit diagnostics and set the invalid bit to true. In any case, the type 4998/// will be updated to reflect a well-formed type for the constructor and 4999/// returned. 5000QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5001 StorageClass &SC) { 5002 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5003 5004 // C++ [class.ctor]p3: 5005 // A constructor shall not be virtual (10.3) or static (9.4). A 5006 // constructor can be invoked for a const, volatile or const 5007 // volatile object. A constructor shall not be declared const, 5008 // volatile, or const volatile (9.3.2). 5009 if (isVirtual) { 5010 if (!D.isInvalidType()) 5011 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5012 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5013 << SourceRange(D.getIdentifierLoc()); 5014 D.setInvalidType(); 5015 } 5016 if (SC == SC_Static) { 5017 if (!D.isInvalidType()) 5018 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5019 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5020 << SourceRange(D.getIdentifierLoc()); 5021 D.setInvalidType(); 5022 SC = SC_None; 5023 } 5024 5025 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5026 if (FTI.TypeQuals != 0) { 5027 if (FTI.TypeQuals & Qualifiers::Const) 5028 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5029 << "const" << SourceRange(D.getIdentifierLoc()); 5030 if (FTI.TypeQuals & Qualifiers::Volatile) 5031 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5032 << "volatile" << SourceRange(D.getIdentifierLoc()); 5033 if (FTI.TypeQuals & Qualifiers::Restrict) 5034 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5035 << "restrict" << SourceRange(D.getIdentifierLoc()); 5036 D.setInvalidType(); 5037 } 5038 5039 // C++0x [class.ctor]p4: 5040 // A constructor shall not be declared with a ref-qualifier. 5041 if (FTI.hasRefQualifier()) { 5042 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5043 << FTI.RefQualifierIsLValueRef 5044 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5045 D.setInvalidType(); 5046 } 5047 5048 // Rebuild the function type "R" without any type qualifiers (in 5049 // case any of the errors above fired) and with "void" as the 5050 // return type, since constructors don't have return types. 5051 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5052 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5053 return R; 5054 5055 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5056 EPI.TypeQuals = 0; 5057 EPI.RefQualifier = RQ_None; 5058 5059 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5060 Proto->getNumArgs(), EPI); 5061} 5062 5063/// CheckConstructor - Checks a fully-formed constructor for 5064/// well-formedness, issuing any diagnostics required. Returns true if 5065/// the constructor declarator is invalid. 5066void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5067 CXXRecordDecl *ClassDecl 5068 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5069 if (!ClassDecl) 5070 return Constructor->setInvalidDecl(); 5071 5072 // C++ [class.copy]p3: 5073 // A declaration of a constructor for a class X is ill-formed if 5074 // its first parameter is of type (optionally cv-qualified) X and 5075 // either there are no other parameters or else all other 5076 // parameters have default arguments. 5077 if (!Constructor->isInvalidDecl() && 5078 ((Constructor->getNumParams() == 1) || 5079 (Constructor->getNumParams() > 1 && 5080 Constructor->getParamDecl(1)->hasDefaultArg())) && 5081 Constructor->getTemplateSpecializationKind() 5082 != TSK_ImplicitInstantiation) { 5083 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5084 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5085 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5086 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5087 const char *ConstRef 5088 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5089 : " const &"; 5090 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5091 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5092 5093 // FIXME: Rather that making the constructor invalid, we should endeavor 5094 // to fix the type. 5095 Constructor->setInvalidDecl(); 5096 } 5097 } 5098} 5099 5100/// CheckDestructor - Checks a fully-formed destructor definition for 5101/// well-formedness, issuing any diagnostics required. Returns true 5102/// on error. 5103bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5104 CXXRecordDecl *RD = Destructor->getParent(); 5105 5106 if (Destructor->isVirtual()) { 5107 SourceLocation Loc; 5108 5109 if (!Destructor->isImplicit()) 5110 Loc = Destructor->getLocation(); 5111 else 5112 Loc = RD->getLocation(); 5113 5114 // If we have a virtual destructor, look up the deallocation function 5115 FunctionDecl *OperatorDelete = 0; 5116 DeclarationName Name = 5117 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5118 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5119 return true; 5120 5121 MarkFunctionReferenced(Loc, OperatorDelete); 5122 5123 Destructor->setOperatorDelete(OperatorDelete); 5124 } 5125 5126 return false; 5127} 5128 5129static inline bool 5130FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5131 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5132 FTI.ArgInfo[0].Param && 5133 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5134} 5135 5136/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5137/// the well-formednes of the destructor declarator @p D with type @p 5138/// R. If there are any errors in the declarator, this routine will 5139/// emit diagnostics and set the declarator to invalid. Even if this happens, 5140/// will be updated to reflect a well-formed type for the destructor and 5141/// returned. 5142QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5143 StorageClass& SC) { 5144 // C++ [class.dtor]p1: 5145 // [...] A typedef-name that names a class is a class-name 5146 // (7.1.3); however, a typedef-name that names a class shall not 5147 // be used as the identifier in the declarator for a destructor 5148 // declaration. 5149 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5150 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5151 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5152 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5153 else if (const TemplateSpecializationType *TST = 5154 DeclaratorType->getAs<TemplateSpecializationType>()) 5155 if (TST->isTypeAlias()) 5156 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5157 << DeclaratorType << 1; 5158 5159 // C++ [class.dtor]p2: 5160 // A destructor is used to destroy objects of its class type. A 5161 // destructor takes no parameters, and no return type can be 5162 // specified for it (not even void). The address of a destructor 5163 // shall not be taken. A destructor shall not be static. A 5164 // destructor can be invoked for a const, volatile or const 5165 // volatile object. A destructor shall not be declared const, 5166 // volatile or const volatile (9.3.2). 5167 if (SC == SC_Static) { 5168 if (!D.isInvalidType()) 5169 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5170 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5171 << SourceRange(D.getIdentifierLoc()) 5172 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5173 5174 SC = SC_None; 5175 } 5176 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5177 // Destructors don't have return types, but the parser will 5178 // happily parse something like: 5179 // 5180 // class X { 5181 // float ~X(); 5182 // }; 5183 // 5184 // The return type will be eliminated later. 5185 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5186 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5187 << SourceRange(D.getIdentifierLoc()); 5188 } 5189 5190 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5191 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5192 if (FTI.TypeQuals & Qualifiers::Const) 5193 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5194 << "const" << SourceRange(D.getIdentifierLoc()); 5195 if (FTI.TypeQuals & Qualifiers::Volatile) 5196 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5197 << "volatile" << SourceRange(D.getIdentifierLoc()); 5198 if (FTI.TypeQuals & Qualifiers::Restrict) 5199 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5200 << "restrict" << SourceRange(D.getIdentifierLoc()); 5201 D.setInvalidType(); 5202 } 5203 5204 // C++0x [class.dtor]p2: 5205 // A destructor shall not be declared with a ref-qualifier. 5206 if (FTI.hasRefQualifier()) { 5207 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5208 << FTI.RefQualifierIsLValueRef 5209 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5210 D.setInvalidType(); 5211 } 5212 5213 // Make sure we don't have any parameters. 5214 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5215 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5216 5217 // Delete the parameters. 5218 FTI.freeArgs(); 5219 D.setInvalidType(); 5220 } 5221 5222 // Make sure the destructor isn't variadic. 5223 if (FTI.isVariadic) { 5224 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5225 D.setInvalidType(); 5226 } 5227 5228 // Rebuild the function type "R" without any type qualifiers or 5229 // parameters (in case any of the errors above fired) and with 5230 // "void" as the return type, since destructors don't have return 5231 // types. 5232 if (!D.isInvalidType()) 5233 return R; 5234 5235 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5236 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5237 EPI.Variadic = false; 5238 EPI.TypeQuals = 0; 5239 EPI.RefQualifier = RQ_None; 5240 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5241} 5242 5243/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5244/// well-formednes of the conversion function declarator @p D with 5245/// type @p R. If there are any errors in the declarator, this routine 5246/// will emit diagnostics and return true. Otherwise, it will return 5247/// false. Either way, the type @p R will be updated to reflect a 5248/// well-formed type for the conversion operator. 5249void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5250 StorageClass& SC) { 5251 // C++ [class.conv.fct]p1: 5252 // Neither parameter types nor return type can be specified. The 5253 // type of a conversion function (8.3.5) is "function taking no 5254 // parameter returning conversion-type-id." 5255 if (SC == SC_Static) { 5256 if (!D.isInvalidType()) 5257 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5258 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5259 << SourceRange(D.getIdentifierLoc()); 5260 D.setInvalidType(); 5261 SC = SC_None; 5262 } 5263 5264 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5265 5266 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5267 // Conversion functions don't have return types, but the parser will 5268 // happily parse something like: 5269 // 5270 // class X { 5271 // float operator bool(); 5272 // }; 5273 // 5274 // The return type will be changed later anyway. 5275 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5276 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5277 << SourceRange(D.getIdentifierLoc()); 5278 D.setInvalidType(); 5279 } 5280 5281 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5282 5283 // Make sure we don't have any parameters. 5284 if (Proto->getNumArgs() > 0) { 5285 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5286 5287 // Delete the parameters. 5288 D.getFunctionTypeInfo().freeArgs(); 5289 D.setInvalidType(); 5290 } else if (Proto->isVariadic()) { 5291 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5292 D.setInvalidType(); 5293 } 5294 5295 // Diagnose "&operator bool()" and other such nonsense. This 5296 // is actually a gcc extension which we don't support. 5297 if (Proto->getResultType() != ConvType) { 5298 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5299 << Proto->getResultType(); 5300 D.setInvalidType(); 5301 ConvType = Proto->getResultType(); 5302 } 5303 5304 // C++ [class.conv.fct]p4: 5305 // The conversion-type-id shall not represent a function type nor 5306 // an array type. 5307 if (ConvType->isArrayType()) { 5308 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5309 ConvType = Context.getPointerType(ConvType); 5310 D.setInvalidType(); 5311 } else if (ConvType->isFunctionType()) { 5312 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5313 ConvType = Context.getPointerType(ConvType); 5314 D.setInvalidType(); 5315 } 5316 5317 // Rebuild the function type "R" without any parameters (in case any 5318 // of the errors above fired) and with the conversion type as the 5319 // return type. 5320 if (D.isInvalidType()) 5321 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5322 5323 // C++0x explicit conversion operators. 5324 if (D.getDeclSpec().isExplicitSpecified()) 5325 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5326 getLangOpts().CPlusPlus0x ? 5327 diag::warn_cxx98_compat_explicit_conversion_functions : 5328 diag::ext_explicit_conversion_functions) 5329 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5330} 5331 5332/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5333/// the declaration of the given C++ conversion function. This routine 5334/// is responsible for recording the conversion function in the C++ 5335/// class, if possible. 5336Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5337 assert(Conversion && "Expected to receive a conversion function declaration"); 5338 5339 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5340 5341 // Make sure we aren't redeclaring the conversion function. 5342 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5343 5344 // C++ [class.conv.fct]p1: 5345 // [...] A conversion function is never used to convert a 5346 // (possibly cv-qualified) object to the (possibly cv-qualified) 5347 // same object type (or a reference to it), to a (possibly 5348 // cv-qualified) base class of that type (or a reference to it), 5349 // or to (possibly cv-qualified) void. 5350 // FIXME: Suppress this warning if the conversion function ends up being a 5351 // virtual function that overrides a virtual function in a base class. 5352 QualType ClassType 5353 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5354 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5355 ConvType = ConvTypeRef->getPointeeType(); 5356 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5357 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5358 /* Suppress diagnostics for instantiations. */; 5359 else if (ConvType->isRecordType()) { 5360 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5361 if (ConvType == ClassType) 5362 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5363 << ClassType; 5364 else if (IsDerivedFrom(ClassType, ConvType)) 5365 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5366 << ClassType << ConvType; 5367 } else if (ConvType->isVoidType()) { 5368 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5369 << ClassType << ConvType; 5370 } 5371 5372 if (FunctionTemplateDecl *ConversionTemplate 5373 = Conversion->getDescribedFunctionTemplate()) 5374 return ConversionTemplate; 5375 5376 return Conversion; 5377} 5378 5379//===----------------------------------------------------------------------===// 5380// Namespace Handling 5381//===----------------------------------------------------------------------===// 5382 5383 5384 5385/// ActOnStartNamespaceDef - This is called at the start of a namespace 5386/// definition. 5387Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5388 SourceLocation InlineLoc, 5389 SourceLocation NamespaceLoc, 5390 SourceLocation IdentLoc, 5391 IdentifierInfo *II, 5392 SourceLocation LBrace, 5393 AttributeList *AttrList) { 5394 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5395 // For anonymous namespace, take the location of the left brace. 5396 SourceLocation Loc = II ? IdentLoc : LBrace; 5397 bool IsInline = InlineLoc.isValid(); 5398 bool IsInvalid = false; 5399 bool IsStd = false; 5400 bool AddToKnown = false; 5401 Scope *DeclRegionScope = NamespcScope->getParent(); 5402 5403 NamespaceDecl *PrevNS = 0; 5404 if (II) { 5405 // C++ [namespace.def]p2: 5406 // The identifier in an original-namespace-definition shall not 5407 // have been previously defined in the declarative region in 5408 // which the original-namespace-definition appears. The 5409 // identifier in an original-namespace-definition is the name of 5410 // the namespace. Subsequently in that declarative region, it is 5411 // treated as an original-namespace-name. 5412 // 5413 // Since namespace names are unique in their scope, and we don't 5414 // look through using directives, just look for any ordinary names. 5415 5416 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5417 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5418 Decl::IDNS_Namespace; 5419 NamedDecl *PrevDecl = 0; 5420 for (DeclContext::lookup_result R 5421 = CurContext->getRedeclContext()->lookup(II); 5422 R.first != R.second; ++R.first) { 5423 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5424 PrevDecl = *R.first; 5425 break; 5426 } 5427 } 5428 5429 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5430 5431 if (PrevNS) { 5432 // This is an extended namespace definition. 5433 if (IsInline != PrevNS->isInline()) { 5434 // inline-ness must match 5435 if (PrevNS->isInline()) { 5436 // The user probably just forgot the 'inline', so suggest that it 5437 // be added back. 5438 Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5439 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5440 } else { 5441 Diag(Loc, diag::err_inline_namespace_mismatch) 5442 << IsInline; 5443 } 5444 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5445 5446 IsInline = PrevNS->isInline(); 5447 } 5448 } else if (PrevDecl) { 5449 // This is an invalid name redefinition. 5450 Diag(Loc, diag::err_redefinition_different_kind) 5451 << II; 5452 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5453 IsInvalid = true; 5454 // Continue on to push Namespc as current DeclContext and return it. 5455 } else if (II->isStr("std") && 5456 CurContext->getRedeclContext()->isTranslationUnit()) { 5457 // This is the first "real" definition of the namespace "std", so update 5458 // our cache of the "std" namespace to point at this definition. 5459 PrevNS = getStdNamespace(); 5460 IsStd = true; 5461 AddToKnown = !IsInline; 5462 } else { 5463 // We've seen this namespace for the first time. 5464 AddToKnown = !IsInline; 5465 } 5466 } else { 5467 // Anonymous namespaces. 5468 5469 // Determine whether the parent already has an anonymous namespace. 5470 DeclContext *Parent = CurContext->getRedeclContext(); 5471 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5472 PrevNS = TU->getAnonymousNamespace(); 5473 } else { 5474 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5475 PrevNS = ND->getAnonymousNamespace(); 5476 } 5477 5478 if (PrevNS && IsInline != PrevNS->isInline()) { 5479 // inline-ness must match 5480 Diag(Loc, diag::err_inline_namespace_mismatch) 5481 << IsInline; 5482 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5483 5484 // Recover by ignoring the new namespace's inline status. 5485 IsInline = PrevNS->isInline(); 5486 } 5487 } 5488 5489 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5490 StartLoc, Loc, II, PrevNS); 5491 if (IsInvalid) 5492 Namespc->setInvalidDecl(); 5493 5494 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5495 5496 // FIXME: Should we be merging attributes? 5497 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5498 PushNamespaceVisibilityAttr(Attr, Loc); 5499 5500 if (IsStd) 5501 StdNamespace = Namespc; 5502 if (AddToKnown) 5503 KnownNamespaces[Namespc] = false; 5504 5505 if (II) { 5506 PushOnScopeChains(Namespc, DeclRegionScope); 5507 } else { 5508 // Link the anonymous namespace into its parent. 5509 DeclContext *Parent = CurContext->getRedeclContext(); 5510 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5511 TU->setAnonymousNamespace(Namespc); 5512 } else { 5513 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5514 } 5515 5516 CurContext->addDecl(Namespc); 5517 5518 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5519 // behaves as if it were replaced by 5520 // namespace unique { /* empty body */ } 5521 // using namespace unique; 5522 // namespace unique { namespace-body } 5523 // where all occurrences of 'unique' in a translation unit are 5524 // replaced by the same identifier and this identifier differs 5525 // from all other identifiers in the entire program. 5526 5527 // We just create the namespace with an empty name and then add an 5528 // implicit using declaration, just like the standard suggests. 5529 // 5530 // CodeGen enforces the "universally unique" aspect by giving all 5531 // declarations semantically contained within an anonymous 5532 // namespace internal linkage. 5533 5534 if (!PrevNS) { 5535 UsingDirectiveDecl* UD 5536 = UsingDirectiveDecl::Create(Context, CurContext, 5537 /* 'using' */ LBrace, 5538 /* 'namespace' */ SourceLocation(), 5539 /* qualifier */ NestedNameSpecifierLoc(), 5540 /* identifier */ SourceLocation(), 5541 Namespc, 5542 /* Ancestor */ CurContext); 5543 UD->setImplicit(); 5544 CurContext->addDecl(UD); 5545 } 5546 } 5547 5548 // Although we could have an invalid decl (i.e. the namespace name is a 5549 // redefinition), push it as current DeclContext and try to continue parsing. 5550 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5551 // for the namespace has the declarations that showed up in that particular 5552 // namespace definition. 5553 PushDeclContext(NamespcScope, Namespc); 5554 return Namespc; 5555} 5556 5557/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5558/// is a namespace alias, returns the namespace it points to. 5559static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5560 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5561 return AD->getNamespace(); 5562 return dyn_cast_or_null<NamespaceDecl>(D); 5563} 5564 5565/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5566/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5567void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5568 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5569 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5570 Namespc->setRBraceLoc(RBrace); 5571 PopDeclContext(); 5572 if (Namespc->hasAttr<VisibilityAttr>()) 5573 PopPragmaVisibility(true, RBrace); 5574} 5575 5576CXXRecordDecl *Sema::getStdBadAlloc() const { 5577 return cast_or_null<CXXRecordDecl>( 5578 StdBadAlloc.get(Context.getExternalSource())); 5579} 5580 5581NamespaceDecl *Sema::getStdNamespace() const { 5582 return cast_or_null<NamespaceDecl>( 5583 StdNamespace.get(Context.getExternalSource())); 5584} 5585 5586/// \brief Retrieve the special "std" namespace, which may require us to 5587/// implicitly define the namespace. 5588NamespaceDecl *Sema::getOrCreateStdNamespace() { 5589 if (!StdNamespace) { 5590 // The "std" namespace has not yet been defined, so build one implicitly. 5591 StdNamespace = NamespaceDecl::Create(Context, 5592 Context.getTranslationUnitDecl(), 5593 /*Inline=*/false, 5594 SourceLocation(), SourceLocation(), 5595 &PP.getIdentifierTable().get("std"), 5596 /*PrevDecl=*/0); 5597 getStdNamespace()->setImplicit(true); 5598 } 5599 5600 return getStdNamespace(); 5601} 5602 5603bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 5604 assert(getLangOpts().CPlusPlus && 5605 "Looking for std::initializer_list outside of C++."); 5606 5607 // We're looking for implicit instantiations of 5608 // template <typename E> class std::initializer_list. 5609 5610 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 5611 return false; 5612 5613 ClassTemplateDecl *Template = 0; 5614 const TemplateArgument *Arguments = 0; 5615 5616 if (const RecordType *RT = Ty->getAs<RecordType>()) { 5617 5618 ClassTemplateSpecializationDecl *Specialization = 5619 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 5620 if (!Specialization) 5621 return false; 5622 5623 Template = Specialization->getSpecializedTemplate(); 5624 Arguments = Specialization->getTemplateArgs().data(); 5625 } else if (const TemplateSpecializationType *TST = 5626 Ty->getAs<TemplateSpecializationType>()) { 5627 Template = dyn_cast_or_null<ClassTemplateDecl>( 5628 TST->getTemplateName().getAsTemplateDecl()); 5629 Arguments = TST->getArgs(); 5630 } 5631 if (!Template) 5632 return false; 5633 5634 if (!StdInitializerList) { 5635 // Haven't recognized std::initializer_list yet, maybe this is it. 5636 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 5637 if (TemplateClass->getIdentifier() != 5638 &PP.getIdentifierTable().get("initializer_list") || 5639 !getStdNamespace()->InEnclosingNamespaceSetOf( 5640 TemplateClass->getDeclContext())) 5641 return false; 5642 // This is a template called std::initializer_list, but is it the right 5643 // template? 5644 TemplateParameterList *Params = Template->getTemplateParameters(); 5645 if (Params->getMinRequiredArguments() != 1) 5646 return false; 5647 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 5648 return false; 5649 5650 // It's the right template. 5651 StdInitializerList = Template; 5652 } 5653 5654 if (Template != StdInitializerList) 5655 return false; 5656 5657 // This is an instance of std::initializer_list. Find the argument type. 5658 if (Element) 5659 *Element = Arguments[0].getAsType(); 5660 return true; 5661} 5662 5663static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 5664 NamespaceDecl *Std = S.getStdNamespace(); 5665 if (!Std) { 5666 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5667 return 0; 5668 } 5669 5670 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 5671 Loc, Sema::LookupOrdinaryName); 5672 if (!S.LookupQualifiedName(Result, Std)) { 5673 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5674 return 0; 5675 } 5676 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 5677 if (!Template) { 5678 Result.suppressDiagnostics(); 5679 // We found something weird. Complain about the first thing we found. 5680 NamedDecl *Found = *Result.begin(); 5681 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 5682 return 0; 5683 } 5684 5685 // We found some template called std::initializer_list. Now verify that it's 5686 // correct. 5687 TemplateParameterList *Params = Template->getTemplateParameters(); 5688 if (Params->getMinRequiredArguments() != 1 || 5689 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 5690 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 5691 return 0; 5692 } 5693 5694 return Template; 5695} 5696 5697QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 5698 if (!StdInitializerList) { 5699 StdInitializerList = LookupStdInitializerList(*this, Loc); 5700 if (!StdInitializerList) 5701 return QualType(); 5702 } 5703 5704 TemplateArgumentListInfo Args(Loc, Loc); 5705 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 5706 Context.getTrivialTypeSourceInfo(Element, 5707 Loc))); 5708 return Context.getCanonicalType( 5709 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 5710} 5711 5712bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 5713 // C++ [dcl.init.list]p2: 5714 // A constructor is an initializer-list constructor if its first parameter 5715 // is of type std::initializer_list<E> or reference to possibly cv-qualified 5716 // std::initializer_list<E> for some type E, and either there are no other 5717 // parameters or else all other parameters have default arguments. 5718 if (Ctor->getNumParams() < 1 || 5719 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 5720 return false; 5721 5722 QualType ArgType = Ctor->getParamDecl(0)->getType(); 5723 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 5724 ArgType = RT->getPointeeType().getUnqualifiedType(); 5725 5726 return isStdInitializerList(ArgType, 0); 5727} 5728 5729/// \brief Determine whether a using statement is in a context where it will be 5730/// apply in all contexts. 5731static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5732 switch (CurContext->getDeclKind()) { 5733 case Decl::TranslationUnit: 5734 return true; 5735 case Decl::LinkageSpec: 5736 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5737 default: 5738 return false; 5739 } 5740} 5741 5742namespace { 5743 5744// Callback to only accept typo corrections that are namespaces. 5745class NamespaceValidatorCCC : public CorrectionCandidateCallback { 5746 public: 5747 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5748 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 5749 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 5750 } 5751 return false; 5752 } 5753}; 5754 5755} 5756 5757static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5758 CXXScopeSpec &SS, 5759 SourceLocation IdentLoc, 5760 IdentifierInfo *Ident) { 5761 NamespaceValidatorCCC Validator; 5762 R.clear(); 5763 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5764 R.getLookupKind(), Sc, &SS, 5765 Validator)) { 5766 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 5767 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOpts())); 5768 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5769 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5770 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5771 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5772 else 5773 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5774 << Ident << CorrectedQuotedStr 5775 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5776 5777 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5778 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5779 5780 R.addDecl(Corrected.getCorrectionDecl()); 5781 return true; 5782 } 5783 return false; 5784} 5785 5786Decl *Sema::ActOnUsingDirective(Scope *S, 5787 SourceLocation UsingLoc, 5788 SourceLocation NamespcLoc, 5789 CXXScopeSpec &SS, 5790 SourceLocation IdentLoc, 5791 IdentifierInfo *NamespcName, 5792 AttributeList *AttrList) { 5793 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5794 assert(NamespcName && "Invalid NamespcName."); 5795 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5796 5797 // This can only happen along a recovery path. 5798 while (S->getFlags() & Scope::TemplateParamScope) 5799 S = S->getParent(); 5800 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5801 5802 UsingDirectiveDecl *UDir = 0; 5803 NestedNameSpecifier *Qualifier = 0; 5804 if (SS.isSet()) 5805 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5806 5807 // Lookup namespace name. 5808 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5809 LookupParsedName(R, S, &SS); 5810 if (R.isAmbiguous()) 5811 return 0; 5812 5813 if (R.empty()) { 5814 R.clear(); 5815 // Allow "using namespace std;" or "using namespace ::std;" even if 5816 // "std" hasn't been defined yet, for GCC compatibility. 5817 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5818 NamespcName->isStr("std")) { 5819 Diag(IdentLoc, diag::ext_using_undefined_std); 5820 R.addDecl(getOrCreateStdNamespace()); 5821 R.resolveKind(); 5822 } 5823 // Otherwise, attempt typo correction. 5824 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5825 } 5826 5827 if (!R.empty()) { 5828 NamedDecl *Named = R.getFoundDecl(); 5829 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5830 && "expected namespace decl"); 5831 // C++ [namespace.udir]p1: 5832 // A using-directive specifies that the names in the nominated 5833 // namespace can be used in the scope in which the 5834 // using-directive appears after the using-directive. During 5835 // unqualified name lookup (3.4.1), the names appear as if they 5836 // were declared in the nearest enclosing namespace which 5837 // contains both the using-directive and the nominated 5838 // namespace. [Note: in this context, "contains" means "contains 5839 // directly or indirectly". ] 5840 5841 // Find enclosing context containing both using-directive and 5842 // nominated namespace. 5843 NamespaceDecl *NS = getNamespaceDecl(Named); 5844 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5845 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5846 CommonAncestor = CommonAncestor->getParent(); 5847 5848 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5849 SS.getWithLocInContext(Context), 5850 IdentLoc, Named, CommonAncestor); 5851 5852 if (IsUsingDirectiveInToplevelContext(CurContext) && 5853 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5854 Diag(IdentLoc, diag::warn_using_directive_in_header); 5855 } 5856 5857 PushUsingDirective(S, UDir); 5858 } else { 5859 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5860 } 5861 5862 // FIXME: We ignore attributes for now. 5863 return UDir; 5864} 5865 5866void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5867 // If the scope has an associated entity and the using directive is at 5868 // namespace or translation unit scope, add the UsingDirectiveDecl into 5869 // its lookup structure so qualified name lookup can find it. 5870 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()); 5871 if (Ctx && !Ctx->isFunctionOrMethod()) 5872 Ctx->addDecl(UDir); 5873 else 5874 // Otherwise, it is at block sope. The using-directives will affect lookup 5875 // only to the end of the scope. 5876 S->PushUsingDirective(UDir); 5877} 5878 5879 5880Decl *Sema::ActOnUsingDeclaration(Scope *S, 5881 AccessSpecifier AS, 5882 bool HasUsingKeyword, 5883 SourceLocation UsingLoc, 5884 CXXScopeSpec &SS, 5885 UnqualifiedId &Name, 5886 AttributeList *AttrList, 5887 bool IsTypeName, 5888 SourceLocation TypenameLoc) { 5889 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5890 5891 switch (Name.getKind()) { 5892 case UnqualifiedId::IK_ImplicitSelfParam: 5893 case UnqualifiedId::IK_Identifier: 5894 case UnqualifiedId::IK_OperatorFunctionId: 5895 case UnqualifiedId::IK_LiteralOperatorId: 5896 case UnqualifiedId::IK_ConversionFunctionId: 5897 break; 5898 5899 case UnqualifiedId::IK_ConstructorName: 5900 case UnqualifiedId::IK_ConstructorTemplateId: 5901 // C++0x inherited constructors. 5902 Diag(Name.getLocStart(), 5903 getLangOpts().CPlusPlus0x ? 5904 diag::warn_cxx98_compat_using_decl_constructor : 5905 diag::err_using_decl_constructor) 5906 << SS.getRange(); 5907 5908 if (getLangOpts().CPlusPlus0x) break; 5909 5910 return 0; 5911 5912 case UnqualifiedId::IK_DestructorName: 5913 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 5914 << SS.getRange(); 5915 return 0; 5916 5917 case UnqualifiedId::IK_TemplateId: 5918 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 5919 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5920 return 0; 5921 } 5922 5923 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5924 DeclarationName TargetName = TargetNameInfo.getName(); 5925 if (!TargetName) 5926 return 0; 5927 5928 // Warn about using declarations. 5929 // TODO: store that the declaration was written without 'using' and 5930 // talk about access decls instead of using decls in the 5931 // diagnostics. 5932 if (!HasUsingKeyword) { 5933 UsingLoc = Name.getLocStart(); 5934 5935 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5936 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5937 } 5938 5939 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5940 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5941 return 0; 5942 5943 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5944 TargetNameInfo, AttrList, 5945 /* IsInstantiation */ false, 5946 IsTypeName, TypenameLoc); 5947 if (UD) 5948 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5949 5950 return UD; 5951} 5952 5953/// \brief Determine whether a using declaration considers the given 5954/// declarations as "equivalent", e.g., if they are redeclarations of 5955/// the same entity or are both typedefs of the same type. 5956static bool 5957IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5958 bool &SuppressRedeclaration) { 5959 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5960 SuppressRedeclaration = false; 5961 return true; 5962 } 5963 5964 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5965 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5966 SuppressRedeclaration = true; 5967 return Context.hasSameType(TD1->getUnderlyingType(), 5968 TD2->getUnderlyingType()); 5969 } 5970 5971 return false; 5972} 5973 5974 5975/// Determines whether to create a using shadow decl for a particular 5976/// decl, given the set of decls existing prior to this using lookup. 5977bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5978 const LookupResult &Previous) { 5979 // Diagnose finding a decl which is not from a base class of the 5980 // current class. We do this now because there are cases where this 5981 // function will silently decide not to build a shadow decl, which 5982 // will pre-empt further diagnostics. 5983 // 5984 // We don't need to do this in C++0x because we do the check once on 5985 // the qualifier. 5986 // 5987 // FIXME: diagnose the following if we care enough: 5988 // struct A { int foo; }; 5989 // struct B : A { using A::foo; }; 5990 // template <class T> struct C : A {}; 5991 // template <class T> struct D : C<T> { using B::foo; } // <--- 5992 // This is invalid (during instantiation) in C++03 because B::foo 5993 // resolves to the using decl in B, which is not a base class of D<T>. 5994 // We can't diagnose it immediately because C<T> is an unknown 5995 // specialization. The UsingShadowDecl in D<T> then points directly 5996 // to A::foo, which will look well-formed when we instantiate. 5997 // The right solution is to not collapse the shadow-decl chain. 5998 if (!getLangOpts().CPlusPlus0x && CurContext->isRecord()) { 5999 DeclContext *OrigDC = Orig->getDeclContext(); 6000 6001 // Handle enums and anonymous structs. 6002 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 6003 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 6004 while (OrigRec->isAnonymousStructOrUnion()) 6005 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 6006 6007 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 6008 if (OrigDC == CurContext) { 6009 Diag(Using->getLocation(), 6010 diag::err_using_decl_nested_name_specifier_is_current_class) 6011 << Using->getQualifierLoc().getSourceRange(); 6012 Diag(Orig->getLocation(), diag::note_using_decl_target); 6013 return true; 6014 } 6015 6016 Diag(Using->getQualifierLoc().getBeginLoc(), 6017 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6018 << Using->getQualifier() 6019 << cast<CXXRecordDecl>(CurContext) 6020 << Using->getQualifierLoc().getSourceRange(); 6021 Diag(Orig->getLocation(), diag::note_using_decl_target); 6022 return true; 6023 } 6024 } 6025 6026 if (Previous.empty()) return false; 6027 6028 NamedDecl *Target = Orig; 6029 if (isa<UsingShadowDecl>(Target)) 6030 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6031 6032 // If the target happens to be one of the previous declarations, we 6033 // don't have a conflict. 6034 // 6035 // FIXME: but we might be increasing its access, in which case we 6036 // should redeclare it. 6037 NamedDecl *NonTag = 0, *Tag = 0; 6038 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 6039 I != E; ++I) { 6040 NamedDecl *D = (*I)->getUnderlyingDecl(); 6041 bool Result; 6042 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 6043 return Result; 6044 6045 (isa<TagDecl>(D) ? Tag : NonTag) = D; 6046 } 6047 6048 if (Target->isFunctionOrFunctionTemplate()) { 6049 FunctionDecl *FD; 6050 if (isa<FunctionTemplateDecl>(Target)) 6051 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6052 else 6053 FD = cast<FunctionDecl>(Target); 6054 6055 NamedDecl *OldDecl = 0; 6056 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6057 case Ovl_Overload: 6058 return false; 6059 6060 case Ovl_NonFunction: 6061 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6062 break; 6063 6064 // We found a decl with the exact signature. 6065 case Ovl_Match: 6066 // If we're in a record, we want to hide the target, so we 6067 // return true (without a diagnostic) to tell the caller not to 6068 // build a shadow decl. 6069 if (CurContext->isRecord()) 6070 return true; 6071 6072 // If we're not in a record, this is an error. 6073 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6074 break; 6075 } 6076 6077 Diag(Target->getLocation(), diag::note_using_decl_target); 6078 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6079 return true; 6080 } 6081 6082 // Target is not a function. 6083 6084 if (isa<TagDecl>(Target)) { 6085 // No conflict between a tag and a non-tag. 6086 if (!Tag) return false; 6087 6088 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6089 Diag(Target->getLocation(), diag::note_using_decl_target); 6090 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6091 return true; 6092 } 6093 6094 // No conflict between a tag and a non-tag. 6095 if (!NonTag) return false; 6096 6097 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6098 Diag(Target->getLocation(), diag::note_using_decl_target); 6099 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6100 return true; 6101} 6102 6103/// Builds a shadow declaration corresponding to a 'using' declaration. 6104UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6105 UsingDecl *UD, 6106 NamedDecl *Orig) { 6107 6108 // If we resolved to another shadow declaration, just coalesce them. 6109 NamedDecl *Target = Orig; 6110 if (isa<UsingShadowDecl>(Target)) { 6111 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6112 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6113 } 6114 6115 UsingShadowDecl *Shadow 6116 = UsingShadowDecl::Create(Context, CurContext, 6117 UD->getLocation(), UD, Target); 6118 UD->addShadowDecl(Shadow); 6119 6120 Shadow->setAccess(UD->getAccess()); 6121 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6122 Shadow->setInvalidDecl(); 6123 6124 if (S) 6125 PushOnScopeChains(Shadow, S); 6126 else 6127 CurContext->addDecl(Shadow); 6128 6129 6130 return Shadow; 6131} 6132 6133/// Hides a using shadow declaration. This is required by the current 6134/// using-decl implementation when a resolvable using declaration in a 6135/// class is followed by a declaration which would hide or override 6136/// one or more of the using decl's targets; for example: 6137/// 6138/// struct Base { void foo(int); }; 6139/// struct Derived : Base { 6140/// using Base::foo; 6141/// void foo(int); 6142/// }; 6143/// 6144/// The governing language is C++03 [namespace.udecl]p12: 6145/// 6146/// When a using-declaration brings names from a base class into a 6147/// derived class scope, member functions in the derived class 6148/// override and/or hide member functions with the same name and 6149/// parameter types in a base class (rather than conflicting). 6150/// 6151/// There are two ways to implement this: 6152/// (1) optimistically create shadow decls when they're not hidden 6153/// by existing declarations, or 6154/// (2) don't create any shadow decls (or at least don't make them 6155/// visible) until we've fully parsed/instantiated the class. 6156/// The problem with (1) is that we might have to retroactively remove 6157/// a shadow decl, which requires several O(n) operations because the 6158/// decl structures are (very reasonably) not designed for removal. 6159/// (2) avoids this but is very fiddly and phase-dependent. 6160void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6161 if (Shadow->getDeclName().getNameKind() == 6162 DeclarationName::CXXConversionFunctionName) 6163 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6164 6165 // Remove it from the DeclContext... 6166 Shadow->getDeclContext()->removeDecl(Shadow); 6167 6168 // ...and the scope, if applicable... 6169 if (S) { 6170 S->RemoveDecl(Shadow); 6171 IdResolver.RemoveDecl(Shadow); 6172 } 6173 6174 // ...and the using decl. 6175 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6176 6177 // TODO: complain somehow if Shadow was used. It shouldn't 6178 // be possible for this to happen, because...? 6179} 6180 6181/// Builds a using declaration. 6182/// 6183/// \param IsInstantiation - Whether this call arises from an 6184/// instantiation of an unresolved using declaration. We treat 6185/// the lookup differently for these declarations. 6186NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6187 SourceLocation UsingLoc, 6188 CXXScopeSpec &SS, 6189 const DeclarationNameInfo &NameInfo, 6190 AttributeList *AttrList, 6191 bool IsInstantiation, 6192 bool IsTypeName, 6193 SourceLocation TypenameLoc) { 6194 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6195 SourceLocation IdentLoc = NameInfo.getLoc(); 6196 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6197 6198 // FIXME: We ignore attributes for now. 6199 6200 if (SS.isEmpty()) { 6201 Diag(IdentLoc, diag::err_using_requires_qualname); 6202 return 0; 6203 } 6204 6205 // Do the redeclaration lookup in the current scope. 6206 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6207 ForRedeclaration); 6208 Previous.setHideTags(false); 6209 if (S) { 6210 LookupName(Previous, S); 6211 6212 // It is really dumb that we have to do this. 6213 LookupResult::Filter F = Previous.makeFilter(); 6214 while (F.hasNext()) { 6215 NamedDecl *D = F.next(); 6216 if (!isDeclInScope(D, CurContext, S)) 6217 F.erase(); 6218 } 6219 F.done(); 6220 } else { 6221 assert(IsInstantiation && "no scope in non-instantiation"); 6222 assert(CurContext->isRecord() && "scope not record in instantiation"); 6223 LookupQualifiedName(Previous, CurContext); 6224 } 6225 6226 // Check for invalid redeclarations. 6227 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6228 return 0; 6229 6230 // Check for bad qualifiers. 6231 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6232 return 0; 6233 6234 DeclContext *LookupContext = computeDeclContext(SS); 6235 NamedDecl *D; 6236 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6237 if (!LookupContext) { 6238 if (IsTypeName) { 6239 // FIXME: not all declaration name kinds are legal here 6240 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6241 UsingLoc, TypenameLoc, 6242 QualifierLoc, 6243 IdentLoc, NameInfo.getName()); 6244 } else { 6245 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6246 QualifierLoc, NameInfo); 6247 } 6248 } else { 6249 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6250 NameInfo, IsTypeName); 6251 } 6252 D->setAccess(AS); 6253 CurContext->addDecl(D); 6254 6255 if (!LookupContext) return D; 6256 UsingDecl *UD = cast<UsingDecl>(D); 6257 6258 if (RequireCompleteDeclContext(SS, LookupContext)) { 6259 UD->setInvalidDecl(); 6260 return UD; 6261 } 6262 6263 // The normal rules do not apply to inheriting constructor declarations. 6264 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6265 if (CheckInheritingConstructorUsingDecl(UD)) 6266 UD->setInvalidDecl(); 6267 return UD; 6268 } 6269 6270 // Otherwise, look up the target name. 6271 6272 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6273 6274 // Unlike most lookups, we don't always want to hide tag 6275 // declarations: tag names are visible through the using declaration 6276 // even if hidden by ordinary names, *except* in a dependent context 6277 // where it's important for the sanity of two-phase lookup. 6278 if (!IsInstantiation) 6279 R.setHideTags(false); 6280 6281 // For the purposes of this lookup, we have a base object type 6282 // equal to that of the current context. 6283 if (CurContext->isRecord()) { 6284 R.setBaseObjectType( 6285 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); 6286 } 6287 6288 LookupQualifiedName(R, LookupContext); 6289 6290 if (R.empty()) { 6291 Diag(IdentLoc, diag::err_no_member) 6292 << NameInfo.getName() << LookupContext << SS.getRange(); 6293 UD->setInvalidDecl(); 6294 return UD; 6295 } 6296 6297 if (R.isAmbiguous()) { 6298 UD->setInvalidDecl(); 6299 return UD; 6300 } 6301 6302 if (IsTypeName) { 6303 // If we asked for a typename and got a non-type decl, error out. 6304 if (!R.getAsSingle<TypeDecl>()) { 6305 Diag(IdentLoc, diag::err_using_typename_non_type); 6306 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6307 Diag((*I)->getUnderlyingDecl()->getLocation(), 6308 diag::note_using_decl_target); 6309 UD->setInvalidDecl(); 6310 return UD; 6311 } 6312 } else { 6313 // If we asked for a non-typename and we got a type, error out, 6314 // but only if this is an instantiation of an unresolved using 6315 // decl. Otherwise just silently find the type name. 6316 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6317 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6318 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6319 UD->setInvalidDecl(); 6320 return UD; 6321 } 6322 } 6323 6324 // C++0x N2914 [namespace.udecl]p6: 6325 // A using-declaration shall not name a namespace. 6326 if (R.getAsSingle<NamespaceDecl>()) { 6327 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6328 << SS.getRange(); 6329 UD->setInvalidDecl(); 6330 return UD; 6331 } 6332 6333 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6334 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6335 BuildUsingShadowDecl(S, UD, *I); 6336 } 6337 6338 return UD; 6339} 6340 6341/// Additional checks for a using declaration referring to a constructor name. 6342bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { 6343 assert(!UD->isTypeName() && "expecting a constructor name"); 6344 6345 const Type *SourceType = UD->getQualifier()->getAsType(); 6346 assert(SourceType && 6347 "Using decl naming constructor doesn't have type in scope spec."); 6348 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6349 6350 // Check whether the named type is a direct base class. 6351 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6352 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6353 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6354 BaseIt != BaseE; ++BaseIt) { 6355 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6356 if (CanonicalSourceType == BaseType) 6357 break; 6358 if (BaseIt->getType()->isDependentType()) 6359 break; 6360 } 6361 6362 if (BaseIt == BaseE) { 6363 // Did not find SourceType in the bases. 6364 Diag(UD->getUsingLocation(), 6365 diag::err_using_decl_constructor_not_in_direct_base) 6366 << UD->getNameInfo().getSourceRange() 6367 << QualType(SourceType, 0) << TargetClass; 6368 return true; 6369 } 6370 6371 if (!CurContext->isDependentContext()) 6372 BaseIt->setInheritConstructors(); 6373 6374 return false; 6375} 6376 6377/// Checks that the given using declaration is not an invalid 6378/// redeclaration. Note that this is checking only for the using decl 6379/// itself, not for any ill-formedness among the UsingShadowDecls. 6380bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6381 bool isTypeName, 6382 const CXXScopeSpec &SS, 6383 SourceLocation NameLoc, 6384 const LookupResult &Prev) { 6385 // C++03 [namespace.udecl]p8: 6386 // C++0x [namespace.udecl]p10: 6387 // A using-declaration is a declaration and can therefore be used 6388 // repeatedly where (and only where) multiple declarations are 6389 // allowed. 6390 // 6391 // That's in non-member contexts. 6392 if (!CurContext->getRedeclContext()->isRecord()) 6393 return false; 6394 6395 NestedNameSpecifier *Qual 6396 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6397 6398 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6399 NamedDecl *D = *I; 6400 6401 bool DTypename; 6402 NestedNameSpecifier *DQual; 6403 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6404 DTypename = UD->isTypeName(); 6405 DQual = UD->getQualifier(); 6406 } else if (UnresolvedUsingValueDecl *UD 6407 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6408 DTypename = false; 6409 DQual = UD->getQualifier(); 6410 } else if (UnresolvedUsingTypenameDecl *UD 6411 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6412 DTypename = true; 6413 DQual = UD->getQualifier(); 6414 } else continue; 6415 6416 // using decls differ if one says 'typename' and the other doesn't. 6417 // FIXME: non-dependent using decls? 6418 if (isTypeName != DTypename) continue; 6419 6420 // using decls differ if they name different scopes (but note that 6421 // template instantiation can cause this check to trigger when it 6422 // didn't before instantiation). 6423 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6424 Context.getCanonicalNestedNameSpecifier(DQual)) 6425 continue; 6426 6427 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6428 Diag(D->getLocation(), diag::note_using_decl) << 1; 6429 return true; 6430 } 6431 6432 return false; 6433} 6434 6435 6436/// Checks that the given nested-name qualifier used in a using decl 6437/// in the current context is appropriately related to the current 6438/// scope. If an error is found, diagnoses it and returns true. 6439bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6440 const CXXScopeSpec &SS, 6441 SourceLocation NameLoc) { 6442 DeclContext *NamedContext = computeDeclContext(SS); 6443 6444 if (!CurContext->isRecord()) { 6445 // C++03 [namespace.udecl]p3: 6446 // C++0x [namespace.udecl]p8: 6447 // A using-declaration for a class member shall be a member-declaration. 6448 6449 // If we weren't able to compute a valid scope, it must be a 6450 // dependent class scope. 6451 if (!NamedContext || NamedContext->isRecord()) { 6452 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6453 << SS.getRange(); 6454 return true; 6455 } 6456 6457 // Otherwise, everything is known to be fine. 6458 return false; 6459 } 6460 6461 // The current scope is a record. 6462 6463 // If the named context is dependent, we can't decide much. 6464 if (!NamedContext) { 6465 // FIXME: in C++0x, we can diagnose if we can prove that the 6466 // nested-name-specifier does not refer to a base class, which is 6467 // still possible in some cases. 6468 6469 // Otherwise we have to conservatively report that things might be 6470 // okay. 6471 return false; 6472 } 6473 6474 if (!NamedContext->isRecord()) { 6475 // Ideally this would point at the last name in the specifier, 6476 // but we don't have that level of source info. 6477 Diag(SS.getRange().getBegin(), 6478 diag::err_using_decl_nested_name_specifier_is_not_class) 6479 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6480 return true; 6481 } 6482 6483 if (!NamedContext->isDependentContext() && 6484 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6485 return true; 6486 6487 if (getLangOpts().CPlusPlus0x) { 6488 // C++0x [namespace.udecl]p3: 6489 // In a using-declaration used as a member-declaration, the 6490 // nested-name-specifier shall name a base class of the class 6491 // being defined. 6492 6493 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6494 cast<CXXRecordDecl>(NamedContext))) { 6495 if (CurContext == NamedContext) { 6496 Diag(NameLoc, 6497 diag::err_using_decl_nested_name_specifier_is_current_class) 6498 << SS.getRange(); 6499 return true; 6500 } 6501 6502 Diag(SS.getRange().getBegin(), 6503 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6504 << (NestedNameSpecifier*) SS.getScopeRep() 6505 << cast<CXXRecordDecl>(CurContext) 6506 << SS.getRange(); 6507 return true; 6508 } 6509 6510 return false; 6511 } 6512 6513 // C++03 [namespace.udecl]p4: 6514 // A using-declaration used as a member-declaration shall refer 6515 // to a member of a base class of the class being defined [etc.]. 6516 6517 // Salient point: SS doesn't have to name a base class as long as 6518 // lookup only finds members from base classes. Therefore we can 6519 // diagnose here only if we can prove that that can't happen, 6520 // i.e. if the class hierarchies provably don't intersect. 6521 6522 // TODO: it would be nice if "definitely valid" results were cached 6523 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6524 // need to be repeated. 6525 6526 struct UserData { 6527 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 6528 6529 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6530 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6531 Data->Bases.insert(Base); 6532 return true; 6533 } 6534 6535 bool hasDependentBases(const CXXRecordDecl *Class) { 6536 return !Class->forallBases(collect, this); 6537 } 6538 6539 /// Returns true if the base is dependent or is one of the 6540 /// accumulated base classes. 6541 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6542 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6543 return !Data->Bases.count(Base); 6544 } 6545 6546 bool mightShareBases(const CXXRecordDecl *Class) { 6547 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6548 } 6549 }; 6550 6551 UserData Data; 6552 6553 // Returns false if we find a dependent base. 6554 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6555 return false; 6556 6557 // Returns false if the class has a dependent base or if it or one 6558 // of its bases is present in the base set of the current context. 6559 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6560 return false; 6561 6562 Diag(SS.getRange().getBegin(), 6563 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6564 << (NestedNameSpecifier*) SS.getScopeRep() 6565 << cast<CXXRecordDecl>(CurContext) 6566 << SS.getRange(); 6567 6568 return true; 6569} 6570 6571Decl *Sema::ActOnAliasDeclaration(Scope *S, 6572 AccessSpecifier AS, 6573 MultiTemplateParamsArg TemplateParamLists, 6574 SourceLocation UsingLoc, 6575 UnqualifiedId &Name, 6576 TypeResult Type) { 6577 // Skip up to the relevant declaration scope. 6578 while (S->getFlags() & Scope::TemplateParamScope) 6579 S = S->getParent(); 6580 assert((S->getFlags() & Scope::DeclScope) && 6581 "got alias-declaration outside of declaration scope"); 6582 6583 if (Type.isInvalid()) 6584 return 0; 6585 6586 bool Invalid = false; 6587 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6588 TypeSourceInfo *TInfo = 0; 6589 GetTypeFromParser(Type.get(), &TInfo); 6590 6591 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6592 return 0; 6593 6594 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6595 UPPC_DeclarationType)) { 6596 Invalid = true; 6597 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6598 TInfo->getTypeLoc().getBeginLoc()); 6599 } 6600 6601 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6602 LookupName(Previous, S); 6603 6604 // Warn about shadowing the name of a template parameter. 6605 if (Previous.isSingleResult() && 6606 Previous.getFoundDecl()->isTemplateParameter()) { 6607 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6608 Previous.clear(); 6609 } 6610 6611 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6612 "name in alias declaration must be an identifier"); 6613 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6614 Name.StartLocation, 6615 Name.Identifier, TInfo); 6616 6617 NewTD->setAccess(AS); 6618 6619 if (Invalid) 6620 NewTD->setInvalidDecl(); 6621 6622 CheckTypedefForVariablyModifiedType(S, NewTD); 6623 Invalid |= NewTD->isInvalidDecl(); 6624 6625 bool Redeclaration = false; 6626 6627 NamedDecl *NewND; 6628 if (TemplateParamLists.size()) { 6629 TypeAliasTemplateDecl *OldDecl = 0; 6630 TemplateParameterList *OldTemplateParams = 0; 6631 6632 if (TemplateParamLists.size() != 1) { 6633 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6634 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6635 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6636 } 6637 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6638 6639 // Only consider previous declarations in the same scope. 6640 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6641 /*ExplicitInstantiationOrSpecialization*/false); 6642 if (!Previous.empty()) { 6643 Redeclaration = true; 6644 6645 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6646 if (!OldDecl && !Invalid) { 6647 Diag(UsingLoc, diag::err_redefinition_different_kind) 6648 << Name.Identifier; 6649 6650 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6651 if (OldD->getLocation().isValid()) 6652 Diag(OldD->getLocation(), diag::note_previous_definition); 6653 6654 Invalid = true; 6655 } 6656 6657 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6658 if (TemplateParameterListsAreEqual(TemplateParams, 6659 OldDecl->getTemplateParameters(), 6660 /*Complain=*/true, 6661 TPL_TemplateMatch)) 6662 OldTemplateParams = OldDecl->getTemplateParameters(); 6663 else 6664 Invalid = true; 6665 6666 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6667 if (!Invalid && 6668 !Context.hasSameType(OldTD->getUnderlyingType(), 6669 NewTD->getUnderlyingType())) { 6670 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6671 // but we can't reasonably accept it. 6672 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6673 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6674 if (OldTD->getLocation().isValid()) 6675 Diag(OldTD->getLocation(), diag::note_previous_definition); 6676 Invalid = true; 6677 } 6678 } 6679 } 6680 6681 // Merge any previous default template arguments into our parameters, 6682 // and check the parameter list. 6683 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6684 TPC_TypeAliasTemplate)) 6685 return 0; 6686 6687 TypeAliasTemplateDecl *NewDecl = 6688 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6689 Name.Identifier, TemplateParams, 6690 NewTD); 6691 6692 NewDecl->setAccess(AS); 6693 6694 if (Invalid) 6695 NewDecl->setInvalidDecl(); 6696 else if (OldDecl) 6697 NewDecl->setPreviousDeclaration(OldDecl); 6698 6699 NewND = NewDecl; 6700 } else { 6701 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6702 NewND = NewTD; 6703 } 6704 6705 if (!Redeclaration) 6706 PushOnScopeChains(NewND, S); 6707 6708 return NewND; 6709} 6710 6711Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6712 SourceLocation NamespaceLoc, 6713 SourceLocation AliasLoc, 6714 IdentifierInfo *Alias, 6715 CXXScopeSpec &SS, 6716 SourceLocation IdentLoc, 6717 IdentifierInfo *Ident) { 6718 6719 // Lookup the namespace name. 6720 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6721 LookupParsedName(R, S, &SS); 6722 6723 // Check if we have a previous declaration with the same name. 6724 NamedDecl *PrevDecl 6725 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6726 ForRedeclaration); 6727 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6728 PrevDecl = 0; 6729 6730 if (PrevDecl) { 6731 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6732 // We already have an alias with the same name that points to the same 6733 // namespace, so don't create a new one. 6734 // FIXME: At some point, we'll want to create the (redundant) 6735 // declaration to maintain better source information. 6736 if (!R.isAmbiguous() && !R.empty() && 6737 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6738 return 0; 6739 } 6740 6741 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6742 diag::err_redefinition_different_kind; 6743 Diag(AliasLoc, DiagID) << Alias; 6744 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6745 return 0; 6746 } 6747 6748 if (R.isAmbiguous()) 6749 return 0; 6750 6751 if (R.empty()) { 6752 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6753 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6754 return 0; 6755 } 6756 } 6757 6758 NamespaceAliasDecl *AliasDecl = 6759 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6760 Alias, SS.getWithLocInContext(Context), 6761 IdentLoc, R.getFoundDecl()); 6762 6763 PushOnScopeChains(AliasDecl, S); 6764 return AliasDecl; 6765} 6766 6767namespace { 6768 /// \brief Scoped object used to handle the state changes required in Sema 6769 /// to implicitly define the body of a C++ member function; 6770 class ImplicitlyDefinedFunctionScope { 6771 Sema &S; 6772 Sema::ContextRAII SavedContext; 6773 6774 public: 6775 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6776 : S(S), SavedContext(S, Method) 6777 { 6778 S.PushFunctionScope(); 6779 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6780 } 6781 6782 ~ImplicitlyDefinedFunctionScope() { 6783 S.PopExpressionEvaluationContext(); 6784 S.PopFunctionScopeInfo(); 6785 } 6786 }; 6787} 6788 6789Sema::ImplicitExceptionSpecification 6790Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6791 // C++ [except.spec]p14: 6792 // An implicitly declared special member function (Clause 12) shall have an 6793 // exception-specification. [...] 6794 ImplicitExceptionSpecification ExceptSpec(Context); 6795 if (ClassDecl->isInvalidDecl()) 6796 return ExceptSpec; 6797 6798 // Direct base-class constructors. 6799 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6800 BEnd = ClassDecl->bases_end(); 6801 B != BEnd; ++B) { 6802 if (B->isVirtual()) // Handled below. 6803 continue; 6804 6805 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6806 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6807 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6808 // If this is a deleted function, add it anyway. This might be conformant 6809 // with the standard. This might not. I'm not sure. It might not matter. 6810 if (Constructor) 6811 ExceptSpec.CalledDecl(Constructor); 6812 } 6813 } 6814 6815 // Virtual base-class constructors. 6816 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6817 BEnd = ClassDecl->vbases_end(); 6818 B != BEnd; ++B) { 6819 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6820 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6821 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6822 // If this is a deleted function, add it anyway. This might be conformant 6823 // with the standard. This might not. I'm not sure. It might not matter. 6824 if (Constructor) 6825 ExceptSpec.CalledDecl(Constructor); 6826 } 6827 } 6828 6829 // Field constructors. 6830 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6831 FEnd = ClassDecl->field_end(); 6832 F != FEnd; ++F) { 6833 if (F->hasInClassInitializer()) { 6834 if (Expr *E = F->getInClassInitializer()) 6835 ExceptSpec.CalledExpr(E); 6836 else if (!F->isInvalidDecl()) 6837 ExceptSpec.SetDelayed(); 6838 } else if (const RecordType *RecordTy 6839 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6840 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6841 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6842 // If this is a deleted function, add it anyway. This might be conformant 6843 // with the standard. This might not. I'm not sure. It might not matter. 6844 // In particular, the problem is that this function never gets called. It 6845 // might just be ill-formed because this function attempts to refer to 6846 // a deleted function here. 6847 if (Constructor) 6848 ExceptSpec.CalledDecl(Constructor); 6849 } 6850 } 6851 6852 return ExceptSpec; 6853} 6854 6855CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6856 CXXRecordDecl *ClassDecl) { 6857 // C++ [class.ctor]p5: 6858 // A default constructor for a class X is a constructor of class X 6859 // that can be called without an argument. If there is no 6860 // user-declared constructor for class X, a default constructor is 6861 // implicitly declared. An implicitly-declared default constructor 6862 // is an inline public member of its class. 6863 assert(!ClassDecl->hasUserDeclaredConstructor() && 6864 "Should not build implicit default constructor!"); 6865 6866 ImplicitExceptionSpecification Spec = 6867 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6868 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6869 6870 // Create the actual constructor declaration. 6871 CanQualType ClassType 6872 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6873 SourceLocation ClassLoc = ClassDecl->getLocation(); 6874 DeclarationName Name 6875 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6876 DeclarationNameInfo NameInfo(Name, ClassLoc); 6877 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 6878 Context, ClassDecl, ClassLoc, NameInfo, 6879 Context.getFunctionType(Context.VoidTy, 0, 0, EPI), /*TInfo=*/0, 6880 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 6881 /*isConstexpr=*/ClassDecl->defaultedDefaultConstructorIsConstexpr() && 6882 getLangOpts().CPlusPlus0x); 6883 DefaultCon->setAccess(AS_public); 6884 DefaultCon->setDefaulted(); 6885 DefaultCon->setImplicit(); 6886 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6887 6888 // Note that we have declared this constructor. 6889 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6890 6891 if (Scope *S = getScopeForContext(ClassDecl)) 6892 PushOnScopeChains(DefaultCon, S, false); 6893 ClassDecl->addDecl(DefaultCon); 6894 6895 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6896 DefaultCon->setDeletedAsWritten(); 6897 6898 return DefaultCon; 6899} 6900 6901void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6902 CXXConstructorDecl *Constructor) { 6903 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6904 !Constructor->doesThisDeclarationHaveABody() && 6905 !Constructor->isDeleted()) && 6906 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6907 6908 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6909 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6910 6911 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6912 DiagnosticErrorTrap Trap(Diags); 6913 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6914 Trap.hasErrorOccurred()) { 6915 Diag(CurrentLocation, diag::note_member_synthesized_at) 6916 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6917 Constructor->setInvalidDecl(); 6918 return; 6919 } 6920 6921 SourceLocation Loc = Constructor->getLocation(); 6922 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6923 6924 Constructor->setUsed(); 6925 MarkVTableUsed(CurrentLocation, ClassDecl); 6926 6927 if (ASTMutationListener *L = getASTMutationListener()) { 6928 L->CompletedImplicitDefinition(Constructor); 6929 } 6930} 6931 6932/// Get any existing defaulted default constructor for the given class. Do not 6933/// implicitly define one if it does not exist. 6934static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6935 CXXRecordDecl *D) { 6936 ASTContext &Context = Self.Context; 6937 QualType ClassType = Context.getTypeDeclType(D); 6938 DeclarationName ConstructorName 6939 = Context.DeclarationNames.getCXXConstructorName( 6940 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6941 6942 DeclContext::lookup_const_iterator Con, ConEnd; 6943 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6944 Con != ConEnd; ++Con) { 6945 // A function template cannot be defaulted. 6946 if (isa<FunctionTemplateDecl>(*Con)) 6947 continue; 6948 6949 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6950 if (Constructor->isDefaultConstructor()) 6951 return Constructor->isDefaulted() ? Constructor : 0; 6952 } 6953 return 0; 6954} 6955 6956void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6957 if (!D) return; 6958 AdjustDeclIfTemplate(D); 6959 6960 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6961 CXXConstructorDecl *CtorDecl 6962 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6963 6964 if (!CtorDecl) return; 6965 6966 // Compute the exception specification for the default constructor. 6967 const FunctionProtoType *CtorTy = 6968 CtorDecl->getType()->castAs<FunctionProtoType>(); 6969 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6970 ImplicitExceptionSpecification Spec = 6971 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6972 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6973 assert(EPI.ExceptionSpecType != EST_Delayed); 6974 6975 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6976 } 6977 6978 // If the default constructor is explicitly defaulted, checking the exception 6979 // specification is deferred until now. 6980 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 6981 !ClassDecl->isDependentType()) 6982 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 6983} 6984 6985void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6986 // We start with an initial pass over the base classes to collect those that 6987 // inherit constructors from. If there are none, we can forgo all further 6988 // processing. 6989 typedef SmallVector<const RecordType *, 4> BasesVector; 6990 BasesVector BasesToInheritFrom; 6991 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6992 BaseE = ClassDecl->bases_end(); 6993 BaseIt != BaseE; ++BaseIt) { 6994 if (BaseIt->getInheritConstructors()) { 6995 QualType Base = BaseIt->getType(); 6996 if (Base->isDependentType()) { 6997 // If we inherit constructors from anything that is dependent, just 6998 // abort processing altogether. We'll get another chance for the 6999 // instantiations. 7000 return; 7001 } 7002 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 7003 } 7004 } 7005 if (BasesToInheritFrom.empty()) 7006 return; 7007 7008 // Now collect the constructors that we already have in the current class. 7009 // Those take precedence over inherited constructors. 7010 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 7011 // unless there is a user-declared constructor with the same signature in 7012 // the class where the using-declaration appears. 7013 llvm::SmallSet<const Type *, 8> ExistingConstructors; 7014 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 7015 CtorE = ClassDecl->ctor_end(); 7016 CtorIt != CtorE; ++CtorIt) { 7017 ExistingConstructors.insert( 7018 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 7019 } 7020 7021 DeclarationName CreatedCtorName = 7022 Context.DeclarationNames.getCXXConstructorName( 7023 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 7024 7025 // Now comes the true work. 7026 // First, we keep a map from constructor types to the base that introduced 7027 // them. Needed for finding conflicting constructors. We also keep the 7028 // actually inserted declarations in there, for pretty diagnostics. 7029 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 7030 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 7031 ConstructorToSourceMap InheritedConstructors; 7032 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 7033 BaseE = BasesToInheritFrom.end(); 7034 BaseIt != BaseE; ++BaseIt) { 7035 const RecordType *Base = *BaseIt; 7036 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 7037 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 7038 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 7039 CtorE = BaseDecl->ctor_end(); 7040 CtorIt != CtorE; ++CtorIt) { 7041 // Find the using declaration for inheriting this base's constructors. 7042 // FIXME: Don't perform name lookup just to obtain a source location! 7043 DeclarationName Name = 7044 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 7045 LookupResult Result(*this, Name, SourceLocation(), LookupUsingDeclName); 7046 LookupQualifiedName(Result, CurContext); 7047 UsingDecl *UD = Result.getAsSingle<UsingDecl>(); 7048 SourceLocation UsingLoc = UD ? UD->getLocation() : 7049 ClassDecl->getLocation(); 7050 7051 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 7052 // from the class X named in the using-declaration consists of actual 7053 // constructors and notional constructors that result from the 7054 // transformation of defaulted parameters as follows: 7055 // - all non-template default constructors of X, and 7056 // - for each non-template constructor of X that has at least one 7057 // parameter with a default argument, the set of constructors that 7058 // results from omitting any ellipsis parameter specification and 7059 // successively omitting parameters with a default argument from the 7060 // end of the parameter-type-list. 7061 CXXConstructorDecl *BaseCtor = *CtorIt; 7062 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 7063 const FunctionProtoType *BaseCtorType = 7064 BaseCtor->getType()->getAs<FunctionProtoType>(); 7065 7066 for (unsigned params = BaseCtor->getMinRequiredArguments(), 7067 maxParams = BaseCtor->getNumParams(); 7068 params <= maxParams; ++params) { 7069 // Skip default constructors. They're never inherited. 7070 if (params == 0) 7071 continue; 7072 // Skip copy and move constructors for the same reason. 7073 if (CanBeCopyOrMove && params == 1) 7074 continue; 7075 7076 // Build up a function type for this particular constructor. 7077 // FIXME: The working paper does not consider that the exception spec 7078 // for the inheriting constructor might be larger than that of the 7079 // source. This code doesn't yet, either. When it does, this code will 7080 // need to be delayed until after exception specifications and in-class 7081 // member initializers are attached. 7082 const Type *NewCtorType; 7083 if (params == maxParams) 7084 NewCtorType = BaseCtorType; 7085 else { 7086 SmallVector<QualType, 16> Args; 7087 for (unsigned i = 0; i < params; ++i) { 7088 Args.push_back(BaseCtorType->getArgType(i)); 7089 } 7090 FunctionProtoType::ExtProtoInfo ExtInfo = 7091 BaseCtorType->getExtProtoInfo(); 7092 ExtInfo.Variadic = false; 7093 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7094 Args.data(), params, ExtInfo) 7095 .getTypePtr(); 7096 } 7097 const Type *CanonicalNewCtorType = 7098 Context.getCanonicalType(NewCtorType); 7099 7100 // Now that we have the type, first check if the class already has a 7101 // constructor with this signature. 7102 if (ExistingConstructors.count(CanonicalNewCtorType)) 7103 continue; 7104 7105 // Then we check if we have already declared an inherited constructor 7106 // with this signature. 7107 std::pair<ConstructorToSourceMap::iterator, bool> result = 7108 InheritedConstructors.insert(std::make_pair( 7109 CanonicalNewCtorType, 7110 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7111 if (!result.second) { 7112 // Already in the map. If it came from a different class, that's an 7113 // error. Not if it's from the same. 7114 CanQualType PreviousBase = result.first->second.first; 7115 if (CanonicalBase != PreviousBase) { 7116 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7117 const CXXConstructorDecl *PrevBaseCtor = 7118 PrevCtor->getInheritedConstructor(); 7119 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7120 7121 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7122 Diag(BaseCtor->getLocation(), 7123 diag::note_using_decl_constructor_conflict_current_ctor); 7124 Diag(PrevBaseCtor->getLocation(), 7125 diag::note_using_decl_constructor_conflict_previous_ctor); 7126 Diag(PrevCtor->getLocation(), 7127 diag::note_using_decl_constructor_conflict_previous_using); 7128 } 7129 continue; 7130 } 7131 7132 // OK, we're there, now add the constructor. 7133 // C++0x [class.inhctor]p8: [...] that would be performed by a 7134 // user-written inline constructor [...] 7135 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7136 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7137 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7138 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7139 /*ImplicitlyDeclared=*/true, 7140 // FIXME: Due to a defect in the standard, we treat inherited 7141 // constructors as constexpr even if that makes them ill-formed. 7142 /*Constexpr=*/BaseCtor->isConstexpr()); 7143 NewCtor->setAccess(BaseCtor->getAccess()); 7144 7145 // Build up the parameter decls and add them. 7146 SmallVector<ParmVarDecl *, 16> ParamDecls; 7147 for (unsigned i = 0; i < params; ++i) { 7148 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7149 UsingLoc, UsingLoc, 7150 /*IdentifierInfo=*/0, 7151 BaseCtorType->getArgType(i), 7152 /*TInfo=*/0, SC_None, 7153 SC_None, /*DefaultArg=*/0)); 7154 } 7155 NewCtor->setParams(ParamDecls); 7156 NewCtor->setInheritedConstructor(BaseCtor); 7157 7158 ClassDecl->addDecl(NewCtor); 7159 result.first->second.second = NewCtor; 7160 } 7161 } 7162 } 7163} 7164 7165Sema::ImplicitExceptionSpecification 7166Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7167 // C++ [except.spec]p14: 7168 // An implicitly declared special member function (Clause 12) shall have 7169 // an exception-specification. 7170 ImplicitExceptionSpecification ExceptSpec(Context); 7171 if (ClassDecl->isInvalidDecl()) 7172 return ExceptSpec; 7173 7174 // Direct base-class destructors. 7175 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7176 BEnd = ClassDecl->bases_end(); 7177 B != BEnd; ++B) { 7178 if (B->isVirtual()) // Handled below. 7179 continue; 7180 7181 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7182 ExceptSpec.CalledDecl( 7183 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7184 } 7185 7186 // Virtual base-class destructors. 7187 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7188 BEnd = ClassDecl->vbases_end(); 7189 B != BEnd; ++B) { 7190 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7191 ExceptSpec.CalledDecl( 7192 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7193 } 7194 7195 // Field destructors. 7196 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7197 FEnd = ClassDecl->field_end(); 7198 F != FEnd; ++F) { 7199 if (const RecordType *RecordTy 7200 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7201 ExceptSpec.CalledDecl( 7202 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7203 } 7204 7205 return ExceptSpec; 7206} 7207 7208CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7209 // C++ [class.dtor]p2: 7210 // If a class has no user-declared destructor, a destructor is 7211 // declared implicitly. An implicitly-declared destructor is an 7212 // inline public member of its class. 7213 7214 ImplicitExceptionSpecification Spec = 7215 ComputeDefaultedDtorExceptionSpec(ClassDecl); 7216 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7217 7218 // Create the actual destructor declaration. 7219 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 7220 7221 CanQualType ClassType 7222 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7223 SourceLocation ClassLoc = ClassDecl->getLocation(); 7224 DeclarationName Name 7225 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7226 DeclarationNameInfo NameInfo(Name, ClassLoc); 7227 CXXDestructorDecl *Destructor 7228 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 7229 /*isInline=*/true, 7230 /*isImplicitlyDeclared=*/true); 7231 Destructor->setAccess(AS_public); 7232 Destructor->setDefaulted(); 7233 Destructor->setImplicit(); 7234 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7235 7236 // Note that we have declared this destructor. 7237 ++ASTContext::NumImplicitDestructorsDeclared; 7238 7239 // Introduce this destructor into its scope. 7240 if (Scope *S = getScopeForContext(ClassDecl)) 7241 PushOnScopeChains(Destructor, S, false); 7242 ClassDecl->addDecl(Destructor); 7243 7244 // This could be uniqued if it ever proves significant. 7245 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 7246 7247 AddOverriddenMethods(ClassDecl, Destructor); 7248 7249 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 7250 Destructor->setDeletedAsWritten(); 7251 7252 return Destructor; 7253} 7254 7255void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7256 CXXDestructorDecl *Destructor) { 7257 assert((Destructor->isDefaulted() && 7258 !Destructor->doesThisDeclarationHaveABody() && 7259 !Destructor->isDeleted()) && 7260 "DefineImplicitDestructor - call it for implicit default dtor"); 7261 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7262 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7263 7264 if (Destructor->isInvalidDecl()) 7265 return; 7266 7267 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7268 7269 DiagnosticErrorTrap Trap(Diags); 7270 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7271 Destructor->getParent()); 7272 7273 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7274 Diag(CurrentLocation, diag::note_member_synthesized_at) 7275 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7276 7277 Destructor->setInvalidDecl(); 7278 return; 7279 } 7280 7281 SourceLocation Loc = Destructor->getLocation(); 7282 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7283 Destructor->setImplicitlyDefined(true); 7284 Destructor->setUsed(); 7285 MarkVTableUsed(CurrentLocation, ClassDecl); 7286 7287 if (ASTMutationListener *L = getASTMutationListener()) { 7288 L->CompletedImplicitDefinition(Destructor); 7289 } 7290} 7291 7292void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 7293 CXXDestructorDecl *destructor) { 7294 // C++11 [class.dtor]p3: 7295 // A declaration of a destructor that does not have an exception- 7296 // specification is implicitly considered to have the same exception- 7297 // specification as an implicit declaration. 7298 const FunctionProtoType *dtorType = destructor->getType()-> 7299 getAs<FunctionProtoType>(); 7300 if (dtorType->hasExceptionSpec()) 7301 return; 7302 7303 ImplicitExceptionSpecification exceptSpec = 7304 ComputeDefaultedDtorExceptionSpec(classDecl); 7305 7306 // Replace the destructor's type, building off the existing one. Fortunately, 7307 // the only thing of interest in the destructor type is its extended info. 7308 // The return and arguments are fixed. 7309 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 7310 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 7311 epi.NumExceptions = exceptSpec.size(); 7312 epi.Exceptions = exceptSpec.data(); 7313 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 7314 7315 destructor->setType(ty); 7316 7317 // FIXME: If the destructor has a body that could throw, and the newly created 7318 // spec doesn't allow exceptions, we should emit a warning, because this 7319 // change in behavior can break conforming C++03 programs at runtime. 7320 // However, we don't have a body yet, so it needs to be done somewhere else. 7321} 7322 7323/// \brief Builds a statement that copies/moves the given entity from \p From to 7324/// \c To. 7325/// 7326/// This routine is used to copy/move the members of a class with an 7327/// implicitly-declared copy/move assignment operator. When the entities being 7328/// copied are arrays, this routine builds for loops to copy them. 7329/// 7330/// \param S The Sema object used for type-checking. 7331/// 7332/// \param Loc The location where the implicit copy/move is being generated. 7333/// 7334/// \param T The type of the expressions being copied/moved. Both expressions 7335/// must have this type. 7336/// 7337/// \param To The expression we are copying/moving to. 7338/// 7339/// \param From The expression we are copying/moving from. 7340/// 7341/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7342/// Otherwise, it's a non-static member subobject. 7343/// 7344/// \param Copying Whether we're copying or moving. 7345/// 7346/// \param Depth Internal parameter recording the depth of the recursion. 7347/// 7348/// \returns A statement or a loop that copies the expressions. 7349static StmtResult 7350BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7351 Expr *To, Expr *From, 7352 bool CopyingBaseSubobject, bool Copying, 7353 unsigned Depth = 0) { 7354 // C++0x [class.copy]p28: 7355 // Each subobject is assigned in the manner appropriate to its type: 7356 // 7357 // - if the subobject is of class type, as if by a call to operator= with 7358 // the subobject as the object expression and the corresponding 7359 // subobject of x as a single function argument (as if by explicit 7360 // qualification; that is, ignoring any possible virtual overriding 7361 // functions in more derived classes); 7362 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7363 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7364 7365 // Look for operator=. 7366 DeclarationName Name 7367 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7368 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7369 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7370 7371 // Filter out any result that isn't a copy/move-assignment operator. 7372 LookupResult::Filter F = OpLookup.makeFilter(); 7373 while (F.hasNext()) { 7374 NamedDecl *D = F.next(); 7375 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7376 if (Method->isCopyAssignmentOperator() || 7377 (!Copying && Method->isMoveAssignmentOperator())) 7378 continue; 7379 7380 F.erase(); 7381 } 7382 F.done(); 7383 7384 // Suppress the protected check (C++ [class.protected]) for each of the 7385 // assignment operators we found. This strange dance is required when 7386 // we're assigning via a base classes's copy-assignment operator. To 7387 // ensure that we're getting the right base class subobject (without 7388 // ambiguities), we need to cast "this" to that subobject type; to 7389 // ensure that we don't go through the virtual call mechanism, we need 7390 // to qualify the operator= name with the base class (see below). However, 7391 // this means that if the base class has a protected copy assignment 7392 // operator, the protected member access check will fail. So, we 7393 // rewrite "protected" access to "public" access in this case, since we 7394 // know by construction that we're calling from a derived class. 7395 if (CopyingBaseSubobject) { 7396 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7397 L != LEnd; ++L) { 7398 if (L.getAccess() == AS_protected) 7399 L.setAccess(AS_public); 7400 } 7401 } 7402 7403 // Create the nested-name-specifier that will be used to qualify the 7404 // reference to operator=; this is required to suppress the virtual 7405 // call mechanism. 7406 CXXScopeSpec SS; 7407 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 7408 SS.MakeTrivial(S.Context, 7409 NestedNameSpecifier::Create(S.Context, 0, false, 7410 CanonicalT), 7411 Loc); 7412 7413 // Create the reference to operator=. 7414 ExprResult OpEqualRef 7415 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7416 /*TemplateKWLoc=*/SourceLocation(), 7417 /*FirstQualifierInScope=*/0, 7418 OpLookup, 7419 /*TemplateArgs=*/0, 7420 /*SuppressQualifierCheck=*/true); 7421 if (OpEqualRef.isInvalid()) 7422 return StmtError(); 7423 7424 // Build the call to the assignment operator. 7425 7426 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7427 OpEqualRef.takeAs<Expr>(), 7428 Loc, &From, 1, Loc); 7429 if (Call.isInvalid()) 7430 return StmtError(); 7431 7432 return S.Owned(Call.takeAs<Stmt>()); 7433 } 7434 7435 // - if the subobject is of scalar type, the built-in assignment 7436 // operator is used. 7437 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7438 if (!ArrayTy) { 7439 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7440 if (Assignment.isInvalid()) 7441 return StmtError(); 7442 7443 return S.Owned(Assignment.takeAs<Stmt>()); 7444 } 7445 7446 // - if the subobject is an array, each element is assigned, in the 7447 // manner appropriate to the element type; 7448 7449 // Construct a loop over the array bounds, e.g., 7450 // 7451 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7452 // 7453 // that will copy each of the array elements. 7454 QualType SizeType = S.Context.getSizeType(); 7455 7456 // Create the iteration variable. 7457 IdentifierInfo *IterationVarName = 0; 7458 { 7459 SmallString<8> Str; 7460 llvm::raw_svector_ostream OS(Str); 7461 OS << "__i" << Depth; 7462 IterationVarName = &S.Context.Idents.get(OS.str()); 7463 } 7464 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7465 IterationVarName, SizeType, 7466 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7467 SC_None, SC_None); 7468 7469 // Initialize the iteration variable to zero. 7470 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7471 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7472 7473 // Create a reference to the iteration variable; we'll use this several 7474 // times throughout. 7475 Expr *IterationVarRef 7476 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 7477 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7478 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 7479 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 7480 7481 // Create the DeclStmt that holds the iteration variable. 7482 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7483 7484 // Create the comparison against the array bound. 7485 llvm::APInt Upper 7486 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7487 Expr *Comparison 7488 = new (S.Context) BinaryOperator(IterationVarRefRVal, 7489 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7490 BO_NE, S.Context.BoolTy, 7491 VK_RValue, OK_Ordinary, Loc); 7492 7493 // Create the pre-increment of the iteration variable. 7494 Expr *Increment 7495 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7496 VK_LValue, OK_Ordinary, Loc); 7497 7498 // Subscript the "from" and "to" expressions with the iteration variable. 7499 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7500 IterationVarRefRVal, 7501 Loc)); 7502 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7503 IterationVarRefRVal, 7504 Loc)); 7505 if (!Copying) // Cast to rvalue 7506 From = CastForMoving(S, From); 7507 7508 // Build the copy/move for an individual element of the array. 7509 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7510 To, From, CopyingBaseSubobject, 7511 Copying, Depth + 1); 7512 if (Copy.isInvalid()) 7513 return StmtError(); 7514 7515 // Construct the loop that copies all elements of this array. 7516 return S.ActOnForStmt(Loc, Loc, InitStmt, 7517 S.MakeFullExpr(Comparison), 7518 0, S.MakeFullExpr(Increment), 7519 Loc, Copy.take()); 7520} 7521 7522std::pair<Sema::ImplicitExceptionSpecification, bool> 7523Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7524 CXXRecordDecl *ClassDecl) { 7525 if (ClassDecl->isInvalidDecl()) 7526 return std::make_pair(ImplicitExceptionSpecification(Context), false); 7527 7528 // C++ [class.copy]p10: 7529 // If the class definition does not explicitly declare a copy 7530 // assignment operator, one is declared implicitly. 7531 // The implicitly-defined copy assignment operator for a class X 7532 // will have the form 7533 // 7534 // X& X::operator=(const X&) 7535 // 7536 // if 7537 bool HasConstCopyAssignment = true; 7538 7539 // -- each direct base class B of X has a copy assignment operator 7540 // whose parameter is of type const B&, const volatile B& or B, 7541 // and 7542 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7543 BaseEnd = ClassDecl->bases_end(); 7544 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7545 // We'll handle this below 7546 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7547 continue; 7548 7549 assert(!Base->getType()->isDependentType() && 7550 "Cannot generate implicit members for class with dependent bases."); 7551 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7552 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7553 &HasConstCopyAssignment); 7554 } 7555 7556 // In C++11, the above citation has "or virtual" added 7557 if (LangOpts.CPlusPlus0x) { 7558 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7559 BaseEnd = ClassDecl->vbases_end(); 7560 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7561 assert(!Base->getType()->isDependentType() && 7562 "Cannot generate implicit members for class with dependent bases."); 7563 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7564 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7565 &HasConstCopyAssignment); 7566 } 7567 } 7568 7569 // -- for all the nonstatic data members of X that are of a class 7570 // type M (or array thereof), each such class type has a copy 7571 // assignment operator whose parameter is of type const M&, 7572 // const volatile M& or M. 7573 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7574 FieldEnd = ClassDecl->field_end(); 7575 HasConstCopyAssignment && Field != FieldEnd; 7576 ++Field) { 7577 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7578 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7579 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 7580 &HasConstCopyAssignment); 7581 } 7582 } 7583 7584 // Otherwise, the implicitly declared copy assignment operator will 7585 // have the form 7586 // 7587 // X& X::operator=(X&) 7588 7589 // C++ [except.spec]p14: 7590 // An implicitly declared special member function (Clause 12) shall have an 7591 // exception-specification. [...] 7592 7593 // It is unspecified whether or not an implicit copy assignment operator 7594 // attempts to deduplicate calls to assignment operators of virtual bases are 7595 // made. As such, this exception specification is effectively unspecified. 7596 // Based on a similar decision made for constness in C++0x, we're erring on 7597 // the side of assuming such calls to be made regardless of whether they 7598 // actually happen. 7599 ImplicitExceptionSpecification ExceptSpec(Context); 7600 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7601 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7602 BaseEnd = ClassDecl->bases_end(); 7603 Base != BaseEnd; ++Base) { 7604 if (Base->isVirtual()) 7605 continue; 7606 7607 CXXRecordDecl *BaseClassDecl 7608 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7609 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7610 ArgQuals, false, 0)) 7611 ExceptSpec.CalledDecl(CopyAssign); 7612 } 7613 7614 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7615 BaseEnd = ClassDecl->vbases_end(); 7616 Base != BaseEnd; ++Base) { 7617 CXXRecordDecl *BaseClassDecl 7618 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7619 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7620 ArgQuals, false, 0)) 7621 ExceptSpec.CalledDecl(CopyAssign); 7622 } 7623 7624 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7625 FieldEnd = ClassDecl->field_end(); 7626 Field != FieldEnd; 7627 ++Field) { 7628 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7629 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7630 if (CXXMethodDecl *CopyAssign = 7631 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7632 ExceptSpec.CalledDecl(CopyAssign); 7633 } 7634 } 7635 7636 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7637} 7638 7639CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7640 // Note: The following rules are largely analoguous to the copy 7641 // constructor rules. Note that virtual bases are not taken into account 7642 // for determining the argument type of the operator. Note also that 7643 // operators taking an object instead of a reference are allowed. 7644 7645 ImplicitExceptionSpecification Spec(Context); 7646 bool Const; 7647 llvm::tie(Spec, Const) = 7648 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7649 7650 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7651 QualType RetType = Context.getLValueReferenceType(ArgType); 7652 if (Const) 7653 ArgType = ArgType.withConst(); 7654 ArgType = Context.getLValueReferenceType(ArgType); 7655 7656 // An implicitly-declared copy assignment operator is an inline public 7657 // member of its class. 7658 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7659 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7660 SourceLocation ClassLoc = ClassDecl->getLocation(); 7661 DeclarationNameInfo NameInfo(Name, ClassLoc); 7662 CXXMethodDecl *CopyAssignment 7663 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7664 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7665 /*TInfo=*/0, /*isStatic=*/false, 7666 /*StorageClassAsWritten=*/SC_None, 7667 /*isInline=*/true, /*isConstexpr=*/false, 7668 SourceLocation()); 7669 CopyAssignment->setAccess(AS_public); 7670 CopyAssignment->setDefaulted(); 7671 CopyAssignment->setImplicit(); 7672 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7673 7674 // Add the parameter to the operator. 7675 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7676 ClassLoc, ClassLoc, /*Id=*/0, 7677 ArgType, /*TInfo=*/0, 7678 SC_None, 7679 SC_None, 0); 7680 CopyAssignment->setParams(FromParam); 7681 7682 // Note that we have added this copy-assignment operator. 7683 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7684 7685 if (Scope *S = getScopeForContext(ClassDecl)) 7686 PushOnScopeChains(CopyAssignment, S, false); 7687 ClassDecl->addDecl(CopyAssignment); 7688 7689 // C++0x [class.copy]p19: 7690 // .... If the class definition does not explicitly declare a copy 7691 // assignment operator, there is no user-declared move constructor, and 7692 // there is no user-declared move assignment operator, a copy assignment 7693 // operator is implicitly declared as defaulted. 7694 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 7695 CopyAssignment->setDeletedAsWritten(); 7696 7697 AddOverriddenMethods(ClassDecl, CopyAssignment); 7698 return CopyAssignment; 7699} 7700 7701void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7702 CXXMethodDecl *CopyAssignOperator) { 7703 assert((CopyAssignOperator->isDefaulted() && 7704 CopyAssignOperator->isOverloadedOperator() && 7705 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7706 !CopyAssignOperator->doesThisDeclarationHaveABody() && 7707 !CopyAssignOperator->isDeleted()) && 7708 "DefineImplicitCopyAssignment called for wrong function"); 7709 7710 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7711 7712 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7713 CopyAssignOperator->setInvalidDecl(); 7714 return; 7715 } 7716 7717 CopyAssignOperator->setUsed(); 7718 7719 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7720 DiagnosticErrorTrap Trap(Diags); 7721 7722 // C++0x [class.copy]p30: 7723 // The implicitly-defined or explicitly-defaulted copy assignment operator 7724 // for a non-union class X performs memberwise copy assignment of its 7725 // subobjects. The direct base classes of X are assigned first, in the 7726 // order of their declaration in the base-specifier-list, and then the 7727 // immediate non-static data members of X are assigned, in the order in 7728 // which they were declared in the class definition. 7729 7730 // The statements that form the synthesized function body. 7731 ASTOwningVector<Stmt*> Statements(*this); 7732 7733 // The parameter for the "other" object, which we are copying from. 7734 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7735 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7736 QualType OtherRefType = Other->getType(); 7737 if (const LValueReferenceType *OtherRef 7738 = OtherRefType->getAs<LValueReferenceType>()) { 7739 OtherRefType = OtherRef->getPointeeType(); 7740 OtherQuals = OtherRefType.getQualifiers(); 7741 } 7742 7743 // Our location for everything implicitly-generated. 7744 SourceLocation Loc = CopyAssignOperator->getLocation(); 7745 7746 // Construct a reference to the "other" object. We'll be using this 7747 // throughout the generated ASTs. 7748 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7749 assert(OtherRef && "Reference to parameter cannot fail!"); 7750 7751 // Construct the "this" pointer. We'll be using this throughout the generated 7752 // ASTs. 7753 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7754 assert(This && "Reference to this cannot fail!"); 7755 7756 // Assign base classes. 7757 bool Invalid = false; 7758 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7759 E = ClassDecl->bases_end(); Base != E; ++Base) { 7760 // Form the assignment: 7761 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7762 QualType BaseType = Base->getType().getUnqualifiedType(); 7763 if (!BaseType->isRecordType()) { 7764 Invalid = true; 7765 continue; 7766 } 7767 7768 CXXCastPath BasePath; 7769 BasePath.push_back(Base); 7770 7771 // Construct the "from" expression, which is an implicit cast to the 7772 // appropriately-qualified base type. 7773 Expr *From = OtherRef; 7774 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7775 CK_UncheckedDerivedToBase, 7776 VK_LValue, &BasePath).take(); 7777 7778 // Dereference "this". 7779 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7780 7781 // Implicitly cast "this" to the appropriately-qualified base type. 7782 To = ImpCastExprToType(To.take(), 7783 Context.getCVRQualifiedType(BaseType, 7784 CopyAssignOperator->getTypeQualifiers()), 7785 CK_UncheckedDerivedToBase, 7786 VK_LValue, &BasePath); 7787 7788 // Build the copy. 7789 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7790 To.get(), From, 7791 /*CopyingBaseSubobject=*/true, 7792 /*Copying=*/true); 7793 if (Copy.isInvalid()) { 7794 Diag(CurrentLocation, diag::note_member_synthesized_at) 7795 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7796 CopyAssignOperator->setInvalidDecl(); 7797 return; 7798 } 7799 7800 // Success! Record the copy. 7801 Statements.push_back(Copy.takeAs<Expr>()); 7802 } 7803 7804 // \brief Reference to the __builtin_memcpy function. 7805 Expr *BuiltinMemCpyRef = 0; 7806 // \brief Reference to the __builtin_objc_memmove_collectable function. 7807 Expr *CollectableMemCpyRef = 0; 7808 7809 // Assign non-static members. 7810 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7811 FieldEnd = ClassDecl->field_end(); 7812 Field != FieldEnd; ++Field) { 7813 if (Field->isUnnamedBitfield()) 7814 continue; 7815 7816 // Check for members of reference type; we can't copy those. 7817 if (Field->getType()->isReferenceType()) { 7818 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7819 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7820 Diag(Field->getLocation(), diag::note_declared_at); 7821 Diag(CurrentLocation, diag::note_member_synthesized_at) 7822 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7823 Invalid = true; 7824 continue; 7825 } 7826 7827 // Check for members of const-qualified, non-class type. 7828 QualType BaseType = Context.getBaseElementType(Field->getType()); 7829 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7830 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7831 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7832 Diag(Field->getLocation(), diag::note_declared_at); 7833 Diag(CurrentLocation, diag::note_member_synthesized_at) 7834 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7835 Invalid = true; 7836 continue; 7837 } 7838 7839 // Suppress assigning zero-width bitfields. 7840 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7841 continue; 7842 7843 QualType FieldType = Field->getType().getNonReferenceType(); 7844 if (FieldType->isIncompleteArrayType()) { 7845 assert(ClassDecl->hasFlexibleArrayMember() && 7846 "Incomplete array type is not valid"); 7847 continue; 7848 } 7849 7850 // Build references to the field in the object we're copying from and to. 7851 CXXScopeSpec SS; // Intentionally empty 7852 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7853 LookupMemberName); 7854 MemberLookup.addDecl(*Field); 7855 MemberLookup.resolveKind(); 7856 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7857 Loc, /*IsArrow=*/false, 7858 SS, SourceLocation(), 0, 7859 MemberLookup, 0); 7860 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7861 Loc, /*IsArrow=*/true, 7862 SS, SourceLocation(), 0, 7863 MemberLookup, 0); 7864 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7865 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7866 7867 // If the field should be copied with __builtin_memcpy rather than via 7868 // explicit assignments, do so. This optimization only applies for arrays 7869 // of scalars and arrays of class type with trivial copy-assignment 7870 // operators. 7871 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7872 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7873 // Compute the size of the memory buffer to be copied. 7874 QualType SizeType = Context.getSizeType(); 7875 llvm::APInt Size(Context.getTypeSize(SizeType), 7876 Context.getTypeSizeInChars(BaseType).getQuantity()); 7877 for (const ConstantArrayType *Array 7878 = Context.getAsConstantArrayType(FieldType); 7879 Array; 7880 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7881 llvm::APInt ArraySize 7882 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7883 Size *= ArraySize; 7884 } 7885 7886 // Take the address of the field references for "from" and "to". 7887 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7888 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7889 7890 bool NeedsCollectableMemCpy = 7891 (BaseType->isRecordType() && 7892 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7893 7894 if (NeedsCollectableMemCpy) { 7895 if (!CollectableMemCpyRef) { 7896 // Create a reference to the __builtin_objc_memmove_collectable function. 7897 LookupResult R(*this, 7898 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7899 Loc, LookupOrdinaryName); 7900 LookupName(R, TUScope, true); 7901 7902 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7903 if (!CollectableMemCpy) { 7904 // Something went horribly wrong earlier, and we will have 7905 // complained about it. 7906 Invalid = true; 7907 continue; 7908 } 7909 7910 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7911 CollectableMemCpy->getType(), 7912 VK_LValue, Loc, 0).take(); 7913 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7914 } 7915 } 7916 // Create a reference to the __builtin_memcpy builtin function. 7917 else if (!BuiltinMemCpyRef) { 7918 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7919 LookupOrdinaryName); 7920 LookupName(R, TUScope, true); 7921 7922 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7923 if (!BuiltinMemCpy) { 7924 // Something went horribly wrong earlier, and we will have complained 7925 // about it. 7926 Invalid = true; 7927 continue; 7928 } 7929 7930 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7931 BuiltinMemCpy->getType(), 7932 VK_LValue, Loc, 0).take(); 7933 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7934 } 7935 7936 ASTOwningVector<Expr*> CallArgs(*this); 7937 CallArgs.push_back(To.takeAs<Expr>()); 7938 CallArgs.push_back(From.takeAs<Expr>()); 7939 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7940 ExprResult Call = ExprError(); 7941 if (NeedsCollectableMemCpy) 7942 Call = ActOnCallExpr(/*Scope=*/0, 7943 CollectableMemCpyRef, 7944 Loc, move_arg(CallArgs), 7945 Loc); 7946 else 7947 Call = ActOnCallExpr(/*Scope=*/0, 7948 BuiltinMemCpyRef, 7949 Loc, move_arg(CallArgs), 7950 Loc); 7951 7952 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7953 Statements.push_back(Call.takeAs<Expr>()); 7954 continue; 7955 } 7956 7957 // Build the copy of this field. 7958 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7959 To.get(), From.get(), 7960 /*CopyingBaseSubobject=*/false, 7961 /*Copying=*/true); 7962 if (Copy.isInvalid()) { 7963 Diag(CurrentLocation, diag::note_member_synthesized_at) 7964 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7965 CopyAssignOperator->setInvalidDecl(); 7966 return; 7967 } 7968 7969 // Success! Record the copy. 7970 Statements.push_back(Copy.takeAs<Stmt>()); 7971 } 7972 7973 if (!Invalid) { 7974 // Add a "return *this;" 7975 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7976 7977 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7978 if (Return.isInvalid()) 7979 Invalid = true; 7980 else { 7981 Statements.push_back(Return.takeAs<Stmt>()); 7982 7983 if (Trap.hasErrorOccurred()) { 7984 Diag(CurrentLocation, diag::note_member_synthesized_at) 7985 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7986 Invalid = true; 7987 } 7988 } 7989 } 7990 7991 if (Invalid) { 7992 CopyAssignOperator->setInvalidDecl(); 7993 return; 7994 } 7995 7996 StmtResult Body; 7997 { 7998 CompoundScopeRAII CompoundScope(*this); 7999 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8000 /*isStmtExpr=*/false); 8001 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8002 } 8003 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 8004 8005 if (ASTMutationListener *L = getASTMutationListener()) { 8006 L->CompletedImplicitDefinition(CopyAssignOperator); 8007 } 8008} 8009 8010Sema::ImplicitExceptionSpecification 8011Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 8012 ImplicitExceptionSpecification ExceptSpec(Context); 8013 8014 if (ClassDecl->isInvalidDecl()) 8015 return ExceptSpec; 8016 8017 // C++0x [except.spec]p14: 8018 // An implicitly declared special member function (Clause 12) shall have an 8019 // exception-specification. [...] 8020 8021 // It is unspecified whether or not an implicit move assignment operator 8022 // attempts to deduplicate calls to assignment operators of virtual bases are 8023 // made. As such, this exception specification is effectively unspecified. 8024 // Based on a similar decision made for constness in C++0x, we're erring on 8025 // the side of assuming such calls to be made regardless of whether they 8026 // actually happen. 8027 // Note that a move constructor is not implicitly declared when there are 8028 // virtual bases, but it can still be user-declared and explicitly defaulted. 8029 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8030 BaseEnd = ClassDecl->bases_end(); 8031 Base != BaseEnd; ++Base) { 8032 if (Base->isVirtual()) 8033 continue; 8034 8035 CXXRecordDecl *BaseClassDecl 8036 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8037 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8038 false, 0)) 8039 ExceptSpec.CalledDecl(MoveAssign); 8040 } 8041 8042 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8043 BaseEnd = ClassDecl->vbases_end(); 8044 Base != BaseEnd; ++Base) { 8045 CXXRecordDecl *BaseClassDecl 8046 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8047 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8048 false, 0)) 8049 ExceptSpec.CalledDecl(MoveAssign); 8050 } 8051 8052 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8053 FieldEnd = ClassDecl->field_end(); 8054 Field != FieldEnd; 8055 ++Field) { 8056 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8057 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8058 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 8059 false, 0)) 8060 ExceptSpec.CalledDecl(MoveAssign); 8061 } 8062 } 8063 8064 return ExceptSpec; 8065} 8066 8067/// Determine whether the class type has any direct or indirect virtual base 8068/// classes which have a non-trivial move assignment operator. 8069static bool 8070hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) { 8071 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8072 BaseEnd = ClassDecl->vbases_end(); 8073 Base != BaseEnd; ++Base) { 8074 CXXRecordDecl *BaseClass = 8075 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8076 8077 // Try to declare the move assignment. If it would be deleted, then the 8078 // class does not have a non-trivial move assignment. 8079 if (BaseClass->needsImplicitMoveAssignment()) 8080 S.DeclareImplicitMoveAssignment(BaseClass); 8081 8082 // If the class has both a trivial move assignment and a non-trivial move 8083 // assignment, hasTrivialMoveAssignment() is false. 8084 if (BaseClass->hasDeclaredMoveAssignment() && 8085 !BaseClass->hasTrivialMoveAssignment()) 8086 return true; 8087 } 8088 8089 return false; 8090} 8091 8092/// Determine whether the given type either has a move constructor or is 8093/// trivially copyable. 8094static bool 8095hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) { 8096 Type = S.Context.getBaseElementType(Type); 8097 8098 // FIXME: Technically, non-trivially-copyable non-class types, such as 8099 // reference types, are supposed to return false here, but that appears 8100 // to be a standard defect. 8101 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl(); 8102 if (!ClassDecl) 8103 return true; 8104 8105 if (Type.isTriviallyCopyableType(S.Context)) 8106 return true; 8107 8108 if (IsConstructor) { 8109 if (ClassDecl->needsImplicitMoveConstructor()) 8110 S.DeclareImplicitMoveConstructor(ClassDecl); 8111 return ClassDecl->hasDeclaredMoveConstructor(); 8112 } 8113 8114 if (ClassDecl->needsImplicitMoveAssignment()) 8115 S.DeclareImplicitMoveAssignment(ClassDecl); 8116 return ClassDecl->hasDeclaredMoveAssignment(); 8117} 8118 8119/// Determine whether all non-static data members and direct or virtual bases 8120/// of class \p ClassDecl have either a move operation, or are trivially 8121/// copyable. 8122static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl, 8123 bool IsConstructor) { 8124 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8125 BaseEnd = ClassDecl->bases_end(); 8126 Base != BaseEnd; ++Base) { 8127 if (Base->isVirtual()) 8128 continue; 8129 8130 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8131 return false; 8132 } 8133 8134 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8135 BaseEnd = ClassDecl->vbases_end(); 8136 Base != BaseEnd; ++Base) { 8137 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8138 return false; 8139 } 8140 8141 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8142 FieldEnd = ClassDecl->field_end(); 8143 Field != FieldEnd; ++Field) { 8144 if (!hasMoveOrIsTriviallyCopyable(S, (*Field)->getType(), IsConstructor)) 8145 return false; 8146 } 8147 8148 return true; 8149} 8150 8151CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8152 // C++11 [class.copy]p20: 8153 // If the definition of a class X does not explicitly declare a move 8154 // assignment operator, one will be implicitly declared as defaulted 8155 // if and only if: 8156 // 8157 // - [first 4 bullets] 8158 assert(ClassDecl->needsImplicitMoveAssignment()); 8159 8160 // [Checked after we build the declaration] 8161 // - the move assignment operator would not be implicitly defined as 8162 // deleted, 8163 8164 // [DR1402]: 8165 // - X has no direct or indirect virtual base class with a non-trivial 8166 // move assignment operator, and 8167 // - each of X's non-static data members and direct or virtual base classes 8168 // has a type that either has a move assignment operator or is trivially 8169 // copyable. 8170 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) || 8171 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) { 8172 ClassDecl->setFailedImplicitMoveAssignment(); 8173 return 0; 8174 } 8175 8176 // Note: The following rules are largely analoguous to the move 8177 // constructor rules. 8178 8179 ImplicitExceptionSpecification Spec( 8180 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 8181 8182 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8183 QualType RetType = Context.getLValueReferenceType(ArgType); 8184 ArgType = Context.getRValueReferenceType(ArgType); 8185 8186 // An implicitly-declared move assignment operator is an inline public 8187 // member of its class. 8188 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8189 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8190 SourceLocation ClassLoc = ClassDecl->getLocation(); 8191 DeclarationNameInfo NameInfo(Name, ClassLoc); 8192 CXXMethodDecl *MoveAssignment 8193 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8194 Context.getFunctionType(RetType, &ArgType, 1, EPI), 8195 /*TInfo=*/0, /*isStatic=*/false, 8196 /*StorageClassAsWritten=*/SC_None, 8197 /*isInline=*/true, 8198 /*isConstexpr=*/false, 8199 SourceLocation()); 8200 MoveAssignment->setAccess(AS_public); 8201 MoveAssignment->setDefaulted(); 8202 MoveAssignment->setImplicit(); 8203 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8204 8205 // Add the parameter to the operator. 8206 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8207 ClassLoc, ClassLoc, /*Id=*/0, 8208 ArgType, /*TInfo=*/0, 8209 SC_None, 8210 SC_None, 0); 8211 MoveAssignment->setParams(FromParam); 8212 8213 // Note that we have added this copy-assignment operator. 8214 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8215 8216 // C++0x [class.copy]p9: 8217 // If the definition of a class X does not explicitly declare a move 8218 // assignment operator, one will be implicitly declared as defaulted if and 8219 // only if: 8220 // [...] 8221 // - the move assignment operator would not be implicitly defined as 8222 // deleted. 8223 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 8224 // Cache this result so that we don't try to generate this over and over 8225 // on every lookup, leaking memory and wasting time. 8226 ClassDecl->setFailedImplicitMoveAssignment(); 8227 return 0; 8228 } 8229 8230 if (Scope *S = getScopeForContext(ClassDecl)) 8231 PushOnScopeChains(MoveAssignment, S, false); 8232 ClassDecl->addDecl(MoveAssignment); 8233 8234 AddOverriddenMethods(ClassDecl, MoveAssignment); 8235 return MoveAssignment; 8236} 8237 8238void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8239 CXXMethodDecl *MoveAssignOperator) { 8240 assert((MoveAssignOperator->isDefaulted() && 8241 MoveAssignOperator->isOverloadedOperator() && 8242 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8243 !MoveAssignOperator->doesThisDeclarationHaveABody() && 8244 !MoveAssignOperator->isDeleted()) && 8245 "DefineImplicitMoveAssignment called for wrong function"); 8246 8247 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8248 8249 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8250 MoveAssignOperator->setInvalidDecl(); 8251 return; 8252 } 8253 8254 MoveAssignOperator->setUsed(); 8255 8256 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8257 DiagnosticErrorTrap Trap(Diags); 8258 8259 // C++0x [class.copy]p28: 8260 // The implicitly-defined or move assignment operator for a non-union class 8261 // X performs memberwise move assignment of its subobjects. The direct base 8262 // classes of X are assigned first, in the order of their declaration in the 8263 // base-specifier-list, and then the immediate non-static data members of X 8264 // are assigned, in the order in which they were declared in the class 8265 // definition. 8266 8267 // The statements that form the synthesized function body. 8268 ASTOwningVector<Stmt*> Statements(*this); 8269 8270 // The parameter for the "other" object, which we are move from. 8271 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8272 QualType OtherRefType = Other->getType()-> 8273 getAs<RValueReferenceType>()->getPointeeType(); 8274 assert(OtherRefType.getQualifiers() == 0 && 8275 "Bad argument type of defaulted move assignment"); 8276 8277 // Our location for everything implicitly-generated. 8278 SourceLocation Loc = MoveAssignOperator->getLocation(); 8279 8280 // Construct a reference to the "other" object. We'll be using this 8281 // throughout the generated ASTs. 8282 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8283 assert(OtherRef && "Reference to parameter cannot fail!"); 8284 // Cast to rvalue. 8285 OtherRef = CastForMoving(*this, OtherRef); 8286 8287 // Construct the "this" pointer. We'll be using this throughout the generated 8288 // ASTs. 8289 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8290 assert(This && "Reference to this cannot fail!"); 8291 8292 // Assign base classes. 8293 bool Invalid = false; 8294 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8295 E = ClassDecl->bases_end(); Base != E; ++Base) { 8296 // Form the assignment: 8297 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8298 QualType BaseType = Base->getType().getUnqualifiedType(); 8299 if (!BaseType->isRecordType()) { 8300 Invalid = true; 8301 continue; 8302 } 8303 8304 CXXCastPath BasePath; 8305 BasePath.push_back(Base); 8306 8307 // Construct the "from" expression, which is an implicit cast to the 8308 // appropriately-qualified base type. 8309 Expr *From = OtherRef; 8310 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8311 VK_XValue, &BasePath).take(); 8312 8313 // Dereference "this". 8314 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8315 8316 // Implicitly cast "this" to the appropriately-qualified base type. 8317 To = ImpCastExprToType(To.take(), 8318 Context.getCVRQualifiedType(BaseType, 8319 MoveAssignOperator->getTypeQualifiers()), 8320 CK_UncheckedDerivedToBase, 8321 VK_LValue, &BasePath); 8322 8323 // Build the move. 8324 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8325 To.get(), From, 8326 /*CopyingBaseSubobject=*/true, 8327 /*Copying=*/false); 8328 if (Move.isInvalid()) { 8329 Diag(CurrentLocation, diag::note_member_synthesized_at) 8330 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8331 MoveAssignOperator->setInvalidDecl(); 8332 return; 8333 } 8334 8335 // Success! Record the move. 8336 Statements.push_back(Move.takeAs<Expr>()); 8337 } 8338 8339 // \brief Reference to the __builtin_memcpy function. 8340 Expr *BuiltinMemCpyRef = 0; 8341 // \brief Reference to the __builtin_objc_memmove_collectable function. 8342 Expr *CollectableMemCpyRef = 0; 8343 8344 // Assign non-static members. 8345 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8346 FieldEnd = ClassDecl->field_end(); 8347 Field != FieldEnd; ++Field) { 8348 if (Field->isUnnamedBitfield()) 8349 continue; 8350 8351 // Check for members of reference type; we can't move those. 8352 if (Field->getType()->isReferenceType()) { 8353 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8354 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8355 Diag(Field->getLocation(), diag::note_declared_at); 8356 Diag(CurrentLocation, diag::note_member_synthesized_at) 8357 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8358 Invalid = true; 8359 continue; 8360 } 8361 8362 // Check for members of const-qualified, non-class type. 8363 QualType BaseType = Context.getBaseElementType(Field->getType()); 8364 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8365 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8366 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8367 Diag(Field->getLocation(), diag::note_declared_at); 8368 Diag(CurrentLocation, diag::note_member_synthesized_at) 8369 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8370 Invalid = true; 8371 continue; 8372 } 8373 8374 // Suppress assigning zero-width bitfields. 8375 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8376 continue; 8377 8378 QualType FieldType = Field->getType().getNonReferenceType(); 8379 if (FieldType->isIncompleteArrayType()) { 8380 assert(ClassDecl->hasFlexibleArrayMember() && 8381 "Incomplete array type is not valid"); 8382 continue; 8383 } 8384 8385 // Build references to the field in the object we're copying from and to. 8386 CXXScopeSpec SS; // Intentionally empty 8387 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8388 LookupMemberName); 8389 MemberLookup.addDecl(*Field); 8390 MemberLookup.resolveKind(); 8391 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8392 Loc, /*IsArrow=*/false, 8393 SS, SourceLocation(), 0, 8394 MemberLookup, 0); 8395 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8396 Loc, /*IsArrow=*/true, 8397 SS, SourceLocation(), 0, 8398 MemberLookup, 0); 8399 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8400 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8401 8402 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8403 "Member reference with rvalue base must be rvalue except for reference " 8404 "members, which aren't allowed for move assignment."); 8405 8406 // If the field should be copied with __builtin_memcpy rather than via 8407 // explicit assignments, do so. This optimization only applies for arrays 8408 // of scalars and arrays of class type with trivial move-assignment 8409 // operators. 8410 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8411 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8412 // Compute the size of the memory buffer to be copied. 8413 QualType SizeType = Context.getSizeType(); 8414 llvm::APInt Size(Context.getTypeSize(SizeType), 8415 Context.getTypeSizeInChars(BaseType).getQuantity()); 8416 for (const ConstantArrayType *Array 8417 = Context.getAsConstantArrayType(FieldType); 8418 Array; 8419 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8420 llvm::APInt ArraySize 8421 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8422 Size *= ArraySize; 8423 } 8424 8425 // Take the address of the field references for "from" and "to". We 8426 // directly construct UnaryOperators here because semantic analysis 8427 // does not permit us to take the address of an xvalue. 8428 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8429 Context.getPointerType(From.get()->getType()), 8430 VK_RValue, OK_Ordinary, Loc); 8431 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8432 Context.getPointerType(To.get()->getType()), 8433 VK_RValue, OK_Ordinary, Loc); 8434 8435 bool NeedsCollectableMemCpy = 8436 (BaseType->isRecordType() && 8437 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8438 8439 if (NeedsCollectableMemCpy) { 8440 if (!CollectableMemCpyRef) { 8441 // Create a reference to the __builtin_objc_memmove_collectable function. 8442 LookupResult R(*this, 8443 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8444 Loc, LookupOrdinaryName); 8445 LookupName(R, TUScope, true); 8446 8447 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8448 if (!CollectableMemCpy) { 8449 // Something went horribly wrong earlier, and we will have 8450 // complained about it. 8451 Invalid = true; 8452 continue; 8453 } 8454 8455 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8456 CollectableMemCpy->getType(), 8457 VK_LValue, Loc, 0).take(); 8458 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8459 } 8460 } 8461 // Create a reference to the __builtin_memcpy builtin function. 8462 else if (!BuiltinMemCpyRef) { 8463 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8464 LookupOrdinaryName); 8465 LookupName(R, TUScope, true); 8466 8467 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8468 if (!BuiltinMemCpy) { 8469 // Something went horribly wrong earlier, and we will have complained 8470 // about it. 8471 Invalid = true; 8472 continue; 8473 } 8474 8475 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8476 BuiltinMemCpy->getType(), 8477 VK_LValue, Loc, 0).take(); 8478 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8479 } 8480 8481 ASTOwningVector<Expr*> CallArgs(*this); 8482 CallArgs.push_back(To.takeAs<Expr>()); 8483 CallArgs.push_back(From.takeAs<Expr>()); 8484 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8485 ExprResult Call = ExprError(); 8486 if (NeedsCollectableMemCpy) 8487 Call = ActOnCallExpr(/*Scope=*/0, 8488 CollectableMemCpyRef, 8489 Loc, move_arg(CallArgs), 8490 Loc); 8491 else 8492 Call = ActOnCallExpr(/*Scope=*/0, 8493 BuiltinMemCpyRef, 8494 Loc, move_arg(CallArgs), 8495 Loc); 8496 8497 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8498 Statements.push_back(Call.takeAs<Expr>()); 8499 continue; 8500 } 8501 8502 // Build the move of this field. 8503 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8504 To.get(), From.get(), 8505 /*CopyingBaseSubobject=*/false, 8506 /*Copying=*/false); 8507 if (Move.isInvalid()) { 8508 Diag(CurrentLocation, diag::note_member_synthesized_at) 8509 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8510 MoveAssignOperator->setInvalidDecl(); 8511 return; 8512 } 8513 8514 // Success! Record the copy. 8515 Statements.push_back(Move.takeAs<Stmt>()); 8516 } 8517 8518 if (!Invalid) { 8519 // Add a "return *this;" 8520 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8521 8522 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8523 if (Return.isInvalid()) 8524 Invalid = true; 8525 else { 8526 Statements.push_back(Return.takeAs<Stmt>()); 8527 8528 if (Trap.hasErrorOccurred()) { 8529 Diag(CurrentLocation, diag::note_member_synthesized_at) 8530 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8531 Invalid = true; 8532 } 8533 } 8534 } 8535 8536 if (Invalid) { 8537 MoveAssignOperator->setInvalidDecl(); 8538 return; 8539 } 8540 8541 StmtResult Body; 8542 { 8543 CompoundScopeRAII CompoundScope(*this); 8544 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8545 /*isStmtExpr=*/false); 8546 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8547 } 8548 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8549 8550 if (ASTMutationListener *L = getASTMutationListener()) { 8551 L->CompletedImplicitDefinition(MoveAssignOperator); 8552 } 8553} 8554 8555std::pair<Sema::ImplicitExceptionSpecification, bool> 8556Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8557 if (ClassDecl->isInvalidDecl()) 8558 return std::make_pair(ImplicitExceptionSpecification(Context), false); 8559 8560 // C++ [class.copy]p5: 8561 // The implicitly-declared copy constructor for a class X will 8562 // have the form 8563 // 8564 // X::X(const X&) 8565 // 8566 // if 8567 // FIXME: It ought to be possible to store this on the record. 8568 bool HasConstCopyConstructor = true; 8569 8570 // -- each direct or virtual base class B of X has a copy 8571 // constructor whose first parameter is of type const B& or 8572 // const volatile B&, and 8573 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8574 BaseEnd = ClassDecl->bases_end(); 8575 HasConstCopyConstructor && Base != BaseEnd; 8576 ++Base) { 8577 // Virtual bases are handled below. 8578 if (Base->isVirtual()) 8579 continue; 8580 8581 CXXRecordDecl *BaseClassDecl 8582 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8583 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8584 &HasConstCopyConstructor); 8585 } 8586 8587 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8588 BaseEnd = ClassDecl->vbases_end(); 8589 HasConstCopyConstructor && Base != BaseEnd; 8590 ++Base) { 8591 CXXRecordDecl *BaseClassDecl 8592 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8593 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8594 &HasConstCopyConstructor); 8595 } 8596 8597 // -- for all the nonstatic data members of X that are of a 8598 // class type M (or array thereof), each such class type 8599 // has a copy constructor whose first parameter is of type 8600 // const M& or const volatile M&. 8601 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8602 FieldEnd = ClassDecl->field_end(); 8603 HasConstCopyConstructor && Field != FieldEnd; 8604 ++Field) { 8605 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8606 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8607 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 8608 &HasConstCopyConstructor); 8609 } 8610 } 8611 // Otherwise, the implicitly declared copy constructor will have 8612 // the form 8613 // 8614 // X::X(X&) 8615 8616 // C++ [except.spec]p14: 8617 // An implicitly declared special member function (Clause 12) shall have an 8618 // exception-specification. [...] 8619 ImplicitExceptionSpecification ExceptSpec(Context); 8620 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8621 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8622 BaseEnd = ClassDecl->bases_end(); 8623 Base != BaseEnd; 8624 ++Base) { 8625 // Virtual bases are handled below. 8626 if (Base->isVirtual()) 8627 continue; 8628 8629 CXXRecordDecl *BaseClassDecl 8630 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8631 if (CXXConstructorDecl *CopyConstructor = 8632 LookupCopyingConstructor(BaseClassDecl, Quals)) 8633 ExceptSpec.CalledDecl(CopyConstructor); 8634 } 8635 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8636 BaseEnd = ClassDecl->vbases_end(); 8637 Base != BaseEnd; 8638 ++Base) { 8639 CXXRecordDecl *BaseClassDecl 8640 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8641 if (CXXConstructorDecl *CopyConstructor = 8642 LookupCopyingConstructor(BaseClassDecl, Quals)) 8643 ExceptSpec.CalledDecl(CopyConstructor); 8644 } 8645 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8646 FieldEnd = ClassDecl->field_end(); 8647 Field != FieldEnd; 8648 ++Field) { 8649 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8650 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8651 if (CXXConstructorDecl *CopyConstructor = 8652 LookupCopyingConstructor(FieldClassDecl, Quals)) 8653 ExceptSpec.CalledDecl(CopyConstructor); 8654 } 8655 } 8656 8657 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8658} 8659 8660CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8661 CXXRecordDecl *ClassDecl) { 8662 // C++ [class.copy]p4: 8663 // If the class definition does not explicitly declare a copy 8664 // constructor, one is declared implicitly. 8665 8666 ImplicitExceptionSpecification Spec(Context); 8667 bool Const; 8668 llvm::tie(Spec, Const) = 8669 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8670 8671 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8672 QualType ArgType = ClassType; 8673 if (Const) 8674 ArgType = ArgType.withConst(); 8675 ArgType = Context.getLValueReferenceType(ArgType); 8676 8677 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8678 8679 DeclarationName Name 8680 = Context.DeclarationNames.getCXXConstructorName( 8681 Context.getCanonicalType(ClassType)); 8682 SourceLocation ClassLoc = ClassDecl->getLocation(); 8683 DeclarationNameInfo NameInfo(Name, ClassLoc); 8684 8685 // An implicitly-declared copy constructor is an inline public 8686 // member of its class. 8687 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8688 Context, ClassDecl, ClassLoc, NameInfo, 8689 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8690 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8691 /*isConstexpr=*/ClassDecl->defaultedCopyConstructorIsConstexpr() && 8692 getLangOpts().CPlusPlus0x); 8693 CopyConstructor->setAccess(AS_public); 8694 CopyConstructor->setDefaulted(); 8695 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8696 8697 // Note that we have declared this constructor. 8698 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8699 8700 // Add the parameter to the constructor. 8701 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8702 ClassLoc, ClassLoc, 8703 /*IdentifierInfo=*/0, 8704 ArgType, /*TInfo=*/0, 8705 SC_None, 8706 SC_None, 0); 8707 CopyConstructor->setParams(FromParam); 8708 8709 if (Scope *S = getScopeForContext(ClassDecl)) 8710 PushOnScopeChains(CopyConstructor, S, false); 8711 ClassDecl->addDecl(CopyConstructor); 8712 8713 // C++11 [class.copy]p8: 8714 // ... If the class definition does not explicitly declare a copy 8715 // constructor, there is no user-declared move constructor, and there is no 8716 // user-declared move assignment operator, a copy constructor is implicitly 8717 // declared as defaulted. 8718 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8719 CopyConstructor->setDeletedAsWritten(); 8720 8721 return CopyConstructor; 8722} 8723 8724void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8725 CXXConstructorDecl *CopyConstructor) { 8726 assert((CopyConstructor->isDefaulted() && 8727 CopyConstructor->isCopyConstructor() && 8728 !CopyConstructor->doesThisDeclarationHaveABody() && 8729 !CopyConstructor->isDeleted()) && 8730 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8731 8732 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8733 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8734 8735 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8736 DiagnosticErrorTrap Trap(Diags); 8737 8738 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8739 Trap.hasErrorOccurred()) { 8740 Diag(CurrentLocation, diag::note_member_synthesized_at) 8741 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8742 CopyConstructor->setInvalidDecl(); 8743 } else { 8744 Sema::CompoundScopeRAII CompoundScope(*this); 8745 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8746 CopyConstructor->getLocation(), 8747 MultiStmtArg(*this, 0, 0), 8748 /*isStmtExpr=*/false) 8749 .takeAs<Stmt>()); 8750 CopyConstructor->setImplicitlyDefined(true); 8751 } 8752 8753 CopyConstructor->setUsed(); 8754 if (ASTMutationListener *L = getASTMutationListener()) { 8755 L->CompletedImplicitDefinition(CopyConstructor); 8756 } 8757} 8758 8759Sema::ImplicitExceptionSpecification 8760Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8761 // C++ [except.spec]p14: 8762 // An implicitly declared special member function (Clause 12) shall have an 8763 // exception-specification. [...] 8764 ImplicitExceptionSpecification ExceptSpec(Context); 8765 if (ClassDecl->isInvalidDecl()) 8766 return ExceptSpec; 8767 8768 // Direct base-class constructors. 8769 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8770 BEnd = ClassDecl->bases_end(); 8771 B != BEnd; ++B) { 8772 if (B->isVirtual()) // Handled below. 8773 continue; 8774 8775 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8776 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8777 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8778 // If this is a deleted function, add it anyway. This might be conformant 8779 // with the standard. This might not. I'm not sure. It might not matter. 8780 if (Constructor) 8781 ExceptSpec.CalledDecl(Constructor); 8782 } 8783 } 8784 8785 // Virtual base-class constructors. 8786 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8787 BEnd = ClassDecl->vbases_end(); 8788 B != BEnd; ++B) { 8789 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8790 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8791 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8792 // If this is a deleted function, add it anyway. This might be conformant 8793 // with the standard. This might not. I'm not sure. It might not matter. 8794 if (Constructor) 8795 ExceptSpec.CalledDecl(Constructor); 8796 } 8797 } 8798 8799 // Field constructors. 8800 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8801 FEnd = ClassDecl->field_end(); 8802 F != FEnd; ++F) { 8803 if (const RecordType *RecordTy 8804 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8805 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8806 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8807 // If this is a deleted function, add it anyway. This might be conformant 8808 // with the standard. This might not. I'm not sure. It might not matter. 8809 // In particular, the problem is that this function never gets called. It 8810 // might just be ill-formed because this function attempts to refer to 8811 // a deleted function here. 8812 if (Constructor) 8813 ExceptSpec.CalledDecl(Constructor); 8814 } 8815 } 8816 8817 return ExceptSpec; 8818} 8819 8820CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8821 CXXRecordDecl *ClassDecl) { 8822 // C++11 [class.copy]p9: 8823 // If the definition of a class X does not explicitly declare a move 8824 // constructor, one will be implicitly declared as defaulted if and only if: 8825 // 8826 // - [first 4 bullets] 8827 assert(ClassDecl->needsImplicitMoveConstructor()); 8828 8829 // [Checked after we build the declaration] 8830 // - the move assignment operator would not be implicitly defined as 8831 // deleted, 8832 8833 // [DR1402]: 8834 // - each of X's non-static data members and direct or virtual base classes 8835 // has a type that either has a move constructor or is trivially copyable. 8836 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) { 8837 ClassDecl->setFailedImplicitMoveConstructor(); 8838 return 0; 8839 } 8840 8841 ImplicitExceptionSpecification Spec( 8842 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8843 8844 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8845 QualType ArgType = Context.getRValueReferenceType(ClassType); 8846 8847 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8848 8849 DeclarationName Name 8850 = Context.DeclarationNames.getCXXConstructorName( 8851 Context.getCanonicalType(ClassType)); 8852 SourceLocation ClassLoc = ClassDecl->getLocation(); 8853 DeclarationNameInfo NameInfo(Name, ClassLoc); 8854 8855 // C++0x [class.copy]p11: 8856 // An implicitly-declared copy/move constructor is an inline public 8857 // member of its class. 8858 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8859 Context, ClassDecl, ClassLoc, NameInfo, 8860 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8861 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8862 /*isConstexpr=*/ClassDecl->defaultedMoveConstructorIsConstexpr() && 8863 getLangOpts().CPlusPlus0x); 8864 MoveConstructor->setAccess(AS_public); 8865 MoveConstructor->setDefaulted(); 8866 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8867 8868 // Add the parameter to the constructor. 8869 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8870 ClassLoc, ClassLoc, 8871 /*IdentifierInfo=*/0, 8872 ArgType, /*TInfo=*/0, 8873 SC_None, 8874 SC_None, 0); 8875 MoveConstructor->setParams(FromParam); 8876 8877 // C++0x [class.copy]p9: 8878 // If the definition of a class X does not explicitly declare a move 8879 // constructor, one will be implicitly declared as defaulted if and only if: 8880 // [...] 8881 // - the move constructor would not be implicitly defined as deleted. 8882 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8883 // Cache this result so that we don't try to generate this over and over 8884 // on every lookup, leaking memory and wasting time. 8885 ClassDecl->setFailedImplicitMoveConstructor(); 8886 return 0; 8887 } 8888 8889 // Note that we have declared this constructor. 8890 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8891 8892 if (Scope *S = getScopeForContext(ClassDecl)) 8893 PushOnScopeChains(MoveConstructor, S, false); 8894 ClassDecl->addDecl(MoveConstructor); 8895 8896 return MoveConstructor; 8897} 8898 8899void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8900 CXXConstructorDecl *MoveConstructor) { 8901 assert((MoveConstructor->isDefaulted() && 8902 MoveConstructor->isMoveConstructor() && 8903 !MoveConstructor->doesThisDeclarationHaveABody() && 8904 !MoveConstructor->isDeleted()) && 8905 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8906 8907 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8908 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8909 8910 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8911 DiagnosticErrorTrap Trap(Diags); 8912 8913 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8914 Trap.hasErrorOccurred()) { 8915 Diag(CurrentLocation, diag::note_member_synthesized_at) 8916 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8917 MoveConstructor->setInvalidDecl(); 8918 } else { 8919 Sema::CompoundScopeRAII CompoundScope(*this); 8920 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8921 MoveConstructor->getLocation(), 8922 MultiStmtArg(*this, 0, 0), 8923 /*isStmtExpr=*/false) 8924 .takeAs<Stmt>()); 8925 MoveConstructor->setImplicitlyDefined(true); 8926 } 8927 8928 MoveConstructor->setUsed(); 8929 8930 if (ASTMutationListener *L = getASTMutationListener()) { 8931 L->CompletedImplicitDefinition(MoveConstructor); 8932 } 8933} 8934 8935bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 8936 return FD->isDeleted() && 8937 (FD->isDefaulted() || FD->isImplicit()) && 8938 isa<CXXMethodDecl>(FD); 8939} 8940 8941/// \brief Mark the call operator of the given lambda closure type as "used". 8942static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 8943 CXXMethodDecl *CallOperator 8944 = cast<CXXMethodDecl>( 8945 *Lambda->lookup( 8946 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).first); 8947 CallOperator->setReferenced(); 8948 CallOperator->setUsed(); 8949} 8950 8951void Sema::DefineImplicitLambdaToFunctionPointerConversion( 8952 SourceLocation CurrentLocation, 8953 CXXConversionDecl *Conv) 8954{ 8955 CXXRecordDecl *Lambda = Conv->getParent(); 8956 8957 // Make sure that the lambda call operator is marked used. 8958 markLambdaCallOperatorUsed(*this, Lambda); 8959 8960 Conv->setUsed(); 8961 8962 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8963 DiagnosticErrorTrap Trap(Diags); 8964 8965 // Return the address of the __invoke function. 8966 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 8967 CXXMethodDecl *Invoke 8968 = cast<CXXMethodDecl>(*Lambda->lookup(InvokeName).first); 8969 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 8970 VK_LValue, Conv->getLocation()).take(); 8971 assert(FunctionRef && "Can't refer to __invoke function?"); 8972 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 8973 Conv->setBody(new (Context) CompoundStmt(Context, &Return, 1, 8974 Conv->getLocation(), 8975 Conv->getLocation())); 8976 8977 // Fill in the __invoke function with a dummy implementation. IR generation 8978 // will fill in the actual details. 8979 Invoke->setUsed(); 8980 Invoke->setReferenced(); 8981 Invoke->setBody(new (Context) CompoundStmt(Context, 0, 0, Conv->getLocation(), 8982 Conv->getLocation())); 8983 8984 if (ASTMutationListener *L = getASTMutationListener()) { 8985 L->CompletedImplicitDefinition(Conv); 8986 L->CompletedImplicitDefinition(Invoke); 8987 } 8988} 8989 8990void Sema::DefineImplicitLambdaToBlockPointerConversion( 8991 SourceLocation CurrentLocation, 8992 CXXConversionDecl *Conv) 8993{ 8994 Conv->setUsed(); 8995 8996 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8997 DiagnosticErrorTrap Trap(Diags); 8998 8999 // Copy-initialize the lambda object as needed to capture it. 9000 Expr *This = ActOnCXXThis(CurrentLocation).take(); 9001 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 9002 9003 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 9004 Conv->getLocation(), 9005 Conv, DerefThis); 9006 9007 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 9008 // behavior. Note that only the general conversion function does this 9009 // (since it's unusable otherwise); in the case where we inline the 9010 // block literal, it has block literal lifetime semantics. 9011 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 9012 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 9013 CK_CopyAndAutoreleaseBlockObject, 9014 BuildBlock.get(), 0, VK_RValue); 9015 9016 if (BuildBlock.isInvalid()) { 9017 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9018 Conv->setInvalidDecl(); 9019 return; 9020 } 9021 9022 // Create the return statement that returns the block from the conversion 9023 // function. 9024 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 9025 if (Return.isInvalid()) { 9026 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9027 Conv->setInvalidDecl(); 9028 return; 9029 } 9030 9031 // Set the body of the conversion function. 9032 Stmt *ReturnS = Return.take(); 9033 Conv->setBody(new (Context) CompoundStmt(Context, &ReturnS, 1, 9034 Conv->getLocation(), 9035 Conv->getLocation())); 9036 9037 // We're done; notify the mutation listener, if any. 9038 if (ASTMutationListener *L = getASTMutationListener()) { 9039 L->CompletedImplicitDefinition(Conv); 9040 } 9041} 9042 9043/// \brief Determine whether the given list arguments contains exactly one 9044/// "real" (non-default) argument. 9045static bool hasOneRealArgument(MultiExprArg Args) { 9046 switch (Args.size()) { 9047 case 0: 9048 return false; 9049 9050 default: 9051 if (!Args.get()[1]->isDefaultArgument()) 9052 return false; 9053 9054 // fall through 9055 case 1: 9056 return !Args.get()[0]->isDefaultArgument(); 9057 } 9058 9059 return false; 9060} 9061 9062ExprResult 9063Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9064 CXXConstructorDecl *Constructor, 9065 MultiExprArg ExprArgs, 9066 bool HadMultipleCandidates, 9067 bool RequiresZeroInit, 9068 unsigned ConstructKind, 9069 SourceRange ParenRange) { 9070 bool Elidable = false; 9071 9072 // C++0x [class.copy]p34: 9073 // When certain criteria are met, an implementation is allowed to 9074 // omit the copy/move construction of a class object, even if the 9075 // copy/move constructor and/or destructor for the object have 9076 // side effects. [...] 9077 // - when a temporary class object that has not been bound to a 9078 // reference (12.2) would be copied/moved to a class object 9079 // with the same cv-unqualified type, the copy/move operation 9080 // can be omitted by constructing the temporary object 9081 // directly into the target of the omitted copy/move 9082 if (ConstructKind == CXXConstructExpr::CK_Complete && 9083 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 9084 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 9085 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 9086 } 9087 9088 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 9089 Elidable, move(ExprArgs), HadMultipleCandidates, 9090 RequiresZeroInit, ConstructKind, ParenRange); 9091} 9092 9093/// BuildCXXConstructExpr - Creates a complete call to a constructor, 9094/// including handling of its default argument expressions. 9095ExprResult 9096Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9097 CXXConstructorDecl *Constructor, bool Elidable, 9098 MultiExprArg ExprArgs, 9099 bool HadMultipleCandidates, 9100 bool RequiresZeroInit, 9101 unsigned ConstructKind, 9102 SourceRange ParenRange) { 9103 unsigned NumExprs = ExprArgs.size(); 9104 Expr **Exprs = (Expr **)ExprArgs.release(); 9105 9106 for (specific_attr_iterator<NonNullAttr> 9107 i = Constructor->specific_attr_begin<NonNullAttr>(), 9108 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 9109 const NonNullAttr *NonNull = *i; 9110 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 9111 } 9112 9113 MarkFunctionReferenced(ConstructLoc, Constructor); 9114 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 9115 Constructor, Elidable, Exprs, NumExprs, 9116 HadMultipleCandidates, /*FIXME*/false, 9117 RequiresZeroInit, 9118 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 9119 ParenRange)); 9120} 9121 9122bool Sema::InitializeVarWithConstructor(VarDecl *VD, 9123 CXXConstructorDecl *Constructor, 9124 MultiExprArg Exprs, 9125 bool HadMultipleCandidates) { 9126 // FIXME: Provide the correct paren SourceRange when available. 9127 ExprResult TempResult = 9128 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 9129 move(Exprs), HadMultipleCandidates, false, 9130 CXXConstructExpr::CK_Complete, SourceRange()); 9131 if (TempResult.isInvalid()) 9132 return true; 9133 9134 Expr *Temp = TempResult.takeAs<Expr>(); 9135 CheckImplicitConversions(Temp, VD->getLocation()); 9136 MarkFunctionReferenced(VD->getLocation(), Constructor); 9137 Temp = MaybeCreateExprWithCleanups(Temp); 9138 VD->setInit(Temp); 9139 9140 return false; 9141} 9142 9143void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9144 if (VD->isInvalidDecl()) return; 9145 9146 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9147 if (ClassDecl->isInvalidDecl()) return; 9148 if (ClassDecl->hasIrrelevantDestructor()) return; 9149 if (ClassDecl->isDependentContext()) return; 9150 9151 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9152 MarkFunctionReferenced(VD->getLocation(), Destructor); 9153 CheckDestructorAccess(VD->getLocation(), Destructor, 9154 PDiag(diag::err_access_dtor_var) 9155 << VD->getDeclName() 9156 << VD->getType()); 9157 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 9158 9159 if (!VD->hasGlobalStorage()) return; 9160 9161 // Emit warning for non-trivial dtor in global scope (a real global, 9162 // class-static, function-static). 9163 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9164 9165 // TODO: this should be re-enabled for static locals by !CXAAtExit 9166 if (!VD->isStaticLocal()) 9167 Diag(VD->getLocation(), diag::warn_global_destructor); 9168} 9169 9170/// \brief Given a constructor and the set of arguments provided for the 9171/// constructor, convert the arguments and add any required default arguments 9172/// to form a proper call to this constructor. 9173/// 9174/// \returns true if an error occurred, false otherwise. 9175bool 9176Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9177 MultiExprArg ArgsPtr, 9178 SourceLocation Loc, 9179 ASTOwningVector<Expr*> &ConvertedArgs, 9180 bool AllowExplicit) { 9181 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9182 unsigned NumArgs = ArgsPtr.size(); 9183 Expr **Args = (Expr **)ArgsPtr.get(); 9184 9185 const FunctionProtoType *Proto 9186 = Constructor->getType()->getAs<FunctionProtoType>(); 9187 assert(Proto && "Constructor without a prototype?"); 9188 unsigned NumArgsInProto = Proto->getNumArgs(); 9189 9190 // If too few arguments are available, we'll fill in the rest with defaults. 9191 if (NumArgs < NumArgsInProto) 9192 ConvertedArgs.reserve(NumArgsInProto); 9193 else 9194 ConvertedArgs.reserve(NumArgs); 9195 9196 VariadicCallType CallType = 9197 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9198 SmallVector<Expr *, 8> AllArgs; 9199 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9200 Proto, 0, Args, NumArgs, AllArgs, 9201 CallType, AllowExplicit); 9202 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 9203 9204 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size()); 9205 9206 // FIXME: Missing call to CheckFunctionCall or equivalent 9207 9208 return Invalid; 9209} 9210 9211static inline bool 9212CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9213 const FunctionDecl *FnDecl) { 9214 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9215 if (isa<NamespaceDecl>(DC)) { 9216 return SemaRef.Diag(FnDecl->getLocation(), 9217 diag::err_operator_new_delete_declared_in_namespace) 9218 << FnDecl->getDeclName(); 9219 } 9220 9221 if (isa<TranslationUnitDecl>(DC) && 9222 FnDecl->getStorageClass() == SC_Static) { 9223 return SemaRef.Diag(FnDecl->getLocation(), 9224 diag::err_operator_new_delete_declared_static) 9225 << FnDecl->getDeclName(); 9226 } 9227 9228 return false; 9229} 9230 9231static inline bool 9232CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9233 CanQualType ExpectedResultType, 9234 CanQualType ExpectedFirstParamType, 9235 unsigned DependentParamTypeDiag, 9236 unsigned InvalidParamTypeDiag) { 9237 QualType ResultType = 9238 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9239 9240 // Check that the result type is not dependent. 9241 if (ResultType->isDependentType()) 9242 return SemaRef.Diag(FnDecl->getLocation(), 9243 diag::err_operator_new_delete_dependent_result_type) 9244 << FnDecl->getDeclName() << ExpectedResultType; 9245 9246 // Check that the result type is what we expect. 9247 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9248 return SemaRef.Diag(FnDecl->getLocation(), 9249 diag::err_operator_new_delete_invalid_result_type) 9250 << FnDecl->getDeclName() << ExpectedResultType; 9251 9252 // A function template must have at least 2 parameters. 9253 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9254 return SemaRef.Diag(FnDecl->getLocation(), 9255 diag::err_operator_new_delete_template_too_few_parameters) 9256 << FnDecl->getDeclName(); 9257 9258 // The function decl must have at least 1 parameter. 9259 if (FnDecl->getNumParams() == 0) 9260 return SemaRef.Diag(FnDecl->getLocation(), 9261 diag::err_operator_new_delete_too_few_parameters) 9262 << FnDecl->getDeclName(); 9263 9264 // Check the the first parameter type is not dependent. 9265 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9266 if (FirstParamType->isDependentType()) 9267 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9268 << FnDecl->getDeclName() << ExpectedFirstParamType; 9269 9270 // Check that the first parameter type is what we expect. 9271 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9272 ExpectedFirstParamType) 9273 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9274 << FnDecl->getDeclName() << ExpectedFirstParamType; 9275 9276 return false; 9277} 9278 9279static bool 9280CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9281 // C++ [basic.stc.dynamic.allocation]p1: 9282 // A program is ill-formed if an allocation function is declared in a 9283 // namespace scope other than global scope or declared static in global 9284 // scope. 9285 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9286 return true; 9287 9288 CanQualType SizeTy = 9289 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9290 9291 // C++ [basic.stc.dynamic.allocation]p1: 9292 // The return type shall be void*. The first parameter shall have type 9293 // std::size_t. 9294 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9295 SizeTy, 9296 diag::err_operator_new_dependent_param_type, 9297 diag::err_operator_new_param_type)) 9298 return true; 9299 9300 // C++ [basic.stc.dynamic.allocation]p1: 9301 // The first parameter shall not have an associated default argument. 9302 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9303 return SemaRef.Diag(FnDecl->getLocation(), 9304 diag::err_operator_new_default_arg) 9305 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9306 9307 return false; 9308} 9309 9310static bool 9311CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9312 // C++ [basic.stc.dynamic.deallocation]p1: 9313 // A program is ill-formed if deallocation functions are declared in a 9314 // namespace scope other than global scope or declared static in global 9315 // scope. 9316 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9317 return true; 9318 9319 // C++ [basic.stc.dynamic.deallocation]p2: 9320 // Each deallocation function shall return void and its first parameter 9321 // shall be void*. 9322 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9323 SemaRef.Context.VoidPtrTy, 9324 diag::err_operator_delete_dependent_param_type, 9325 diag::err_operator_delete_param_type)) 9326 return true; 9327 9328 return false; 9329} 9330 9331/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9332/// of this overloaded operator is well-formed. If so, returns false; 9333/// otherwise, emits appropriate diagnostics and returns true. 9334bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9335 assert(FnDecl && FnDecl->isOverloadedOperator() && 9336 "Expected an overloaded operator declaration"); 9337 9338 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9339 9340 // C++ [over.oper]p5: 9341 // The allocation and deallocation functions, operator new, 9342 // operator new[], operator delete and operator delete[], are 9343 // described completely in 3.7.3. The attributes and restrictions 9344 // found in the rest of this subclause do not apply to them unless 9345 // explicitly stated in 3.7.3. 9346 if (Op == OO_Delete || Op == OO_Array_Delete) 9347 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9348 9349 if (Op == OO_New || Op == OO_Array_New) 9350 return CheckOperatorNewDeclaration(*this, FnDecl); 9351 9352 // C++ [over.oper]p6: 9353 // An operator function shall either be a non-static member 9354 // function or be a non-member function and have at least one 9355 // parameter whose type is a class, a reference to a class, an 9356 // enumeration, or a reference to an enumeration. 9357 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9358 if (MethodDecl->isStatic()) 9359 return Diag(FnDecl->getLocation(), 9360 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9361 } else { 9362 bool ClassOrEnumParam = false; 9363 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9364 ParamEnd = FnDecl->param_end(); 9365 Param != ParamEnd; ++Param) { 9366 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9367 if (ParamType->isDependentType() || ParamType->isRecordType() || 9368 ParamType->isEnumeralType()) { 9369 ClassOrEnumParam = true; 9370 break; 9371 } 9372 } 9373 9374 if (!ClassOrEnumParam) 9375 return Diag(FnDecl->getLocation(), 9376 diag::err_operator_overload_needs_class_or_enum) 9377 << FnDecl->getDeclName(); 9378 } 9379 9380 // C++ [over.oper]p8: 9381 // An operator function cannot have default arguments (8.3.6), 9382 // except where explicitly stated below. 9383 // 9384 // Only the function-call operator allows default arguments 9385 // (C++ [over.call]p1). 9386 if (Op != OO_Call) { 9387 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9388 Param != FnDecl->param_end(); ++Param) { 9389 if ((*Param)->hasDefaultArg()) 9390 return Diag((*Param)->getLocation(), 9391 diag::err_operator_overload_default_arg) 9392 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9393 } 9394 } 9395 9396 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9397 { false, false, false } 9398#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9399 , { Unary, Binary, MemberOnly } 9400#include "clang/Basic/OperatorKinds.def" 9401 }; 9402 9403 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9404 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9405 bool MustBeMemberOperator = OperatorUses[Op][2]; 9406 9407 // C++ [over.oper]p8: 9408 // [...] Operator functions cannot have more or fewer parameters 9409 // than the number required for the corresponding operator, as 9410 // described in the rest of this subclause. 9411 unsigned NumParams = FnDecl->getNumParams() 9412 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9413 if (Op != OO_Call && 9414 ((NumParams == 1 && !CanBeUnaryOperator) || 9415 (NumParams == 2 && !CanBeBinaryOperator) || 9416 (NumParams < 1) || (NumParams > 2))) { 9417 // We have the wrong number of parameters. 9418 unsigned ErrorKind; 9419 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9420 ErrorKind = 2; // 2 -> unary or binary. 9421 } else if (CanBeUnaryOperator) { 9422 ErrorKind = 0; // 0 -> unary 9423 } else { 9424 assert(CanBeBinaryOperator && 9425 "All non-call overloaded operators are unary or binary!"); 9426 ErrorKind = 1; // 1 -> binary 9427 } 9428 9429 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9430 << FnDecl->getDeclName() << NumParams << ErrorKind; 9431 } 9432 9433 // Overloaded operators other than operator() cannot be variadic. 9434 if (Op != OO_Call && 9435 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9436 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9437 << FnDecl->getDeclName(); 9438 } 9439 9440 // Some operators must be non-static member functions. 9441 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9442 return Diag(FnDecl->getLocation(), 9443 diag::err_operator_overload_must_be_member) 9444 << FnDecl->getDeclName(); 9445 } 9446 9447 // C++ [over.inc]p1: 9448 // The user-defined function called operator++ implements the 9449 // prefix and postfix ++ operator. If this function is a member 9450 // function with no parameters, or a non-member function with one 9451 // parameter of class or enumeration type, it defines the prefix 9452 // increment operator ++ for objects of that type. If the function 9453 // is a member function with one parameter (which shall be of type 9454 // int) or a non-member function with two parameters (the second 9455 // of which shall be of type int), it defines the postfix 9456 // increment operator ++ for objects of that type. 9457 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9458 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9459 bool ParamIsInt = false; 9460 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9461 ParamIsInt = BT->getKind() == BuiltinType::Int; 9462 9463 if (!ParamIsInt) 9464 return Diag(LastParam->getLocation(), 9465 diag::err_operator_overload_post_incdec_must_be_int) 9466 << LastParam->getType() << (Op == OO_MinusMinus); 9467 } 9468 9469 return false; 9470} 9471 9472/// CheckLiteralOperatorDeclaration - Check whether the declaration 9473/// of this literal operator function is well-formed. If so, returns 9474/// false; otherwise, emits appropriate diagnostics and returns true. 9475bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9476 if (isa<CXXMethodDecl>(FnDecl)) { 9477 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9478 << FnDecl->getDeclName(); 9479 return true; 9480 } 9481 9482 if (FnDecl->isExternC()) { 9483 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 9484 return true; 9485 } 9486 9487 bool Valid = false; 9488 9489 // This might be the definition of a literal operator template. 9490 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 9491 // This might be a specialization of a literal operator template. 9492 if (!TpDecl) 9493 TpDecl = FnDecl->getPrimaryTemplate(); 9494 9495 // template <char...> type operator "" name() is the only valid template 9496 // signature, and the only valid signature with no parameters. 9497 if (TpDecl) { 9498 if (FnDecl->param_size() == 0) { 9499 // Must have only one template parameter 9500 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9501 if (Params->size() == 1) { 9502 NonTypeTemplateParmDecl *PmDecl = 9503 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9504 9505 // The template parameter must be a char parameter pack. 9506 if (PmDecl && PmDecl->isTemplateParameterPack() && 9507 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9508 Valid = true; 9509 } 9510 } 9511 } else if (FnDecl->param_size()) { 9512 // Check the first parameter 9513 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9514 9515 QualType T = (*Param)->getType().getUnqualifiedType(); 9516 9517 // unsigned long long int, long double, and any character type are allowed 9518 // as the only parameters. 9519 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9520 Context.hasSameType(T, Context.LongDoubleTy) || 9521 Context.hasSameType(T, Context.CharTy) || 9522 Context.hasSameType(T, Context.WCharTy) || 9523 Context.hasSameType(T, Context.Char16Ty) || 9524 Context.hasSameType(T, Context.Char32Ty)) { 9525 if (++Param == FnDecl->param_end()) 9526 Valid = true; 9527 goto FinishedParams; 9528 } 9529 9530 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9531 const PointerType *PT = T->getAs<PointerType>(); 9532 if (!PT) 9533 goto FinishedParams; 9534 T = PT->getPointeeType(); 9535 if (!T.isConstQualified() || T.isVolatileQualified()) 9536 goto FinishedParams; 9537 T = T.getUnqualifiedType(); 9538 9539 // Move on to the second parameter; 9540 ++Param; 9541 9542 // If there is no second parameter, the first must be a const char * 9543 if (Param == FnDecl->param_end()) { 9544 if (Context.hasSameType(T, Context.CharTy)) 9545 Valid = true; 9546 goto FinishedParams; 9547 } 9548 9549 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9550 // are allowed as the first parameter to a two-parameter function 9551 if (!(Context.hasSameType(T, Context.CharTy) || 9552 Context.hasSameType(T, Context.WCharTy) || 9553 Context.hasSameType(T, Context.Char16Ty) || 9554 Context.hasSameType(T, Context.Char32Ty))) 9555 goto FinishedParams; 9556 9557 // The second and final parameter must be an std::size_t 9558 T = (*Param)->getType().getUnqualifiedType(); 9559 if (Context.hasSameType(T, Context.getSizeType()) && 9560 ++Param == FnDecl->param_end()) 9561 Valid = true; 9562 } 9563 9564 // FIXME: This diagnostic is absolutely terrible. 9565FinishedParams: 9566 if (!Valid) { 9567 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9568 << FnDecl->getDeclName(); 9569 return true; 9570 } 9571 9572 // A parameter-declaration-clause containing a default argument is not 9573 // equivalent to any of the permitted forms. 9574 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9575 ParamEnd = FnDecl->param_end(); 9576 Param != ParamEnd; ++Param) { 9577 if ((*Param)->hasDefaultArg()) { 9578 Diag((*Param)->getDefaultArgRange().getBegin(), 9579 diag::err_literal_operator_default_argument) 9580 << (*Param)->getDefaultArgRange(); 9581 break; 9582 } 9583 } 9584 9585 StringRef LiteralName 9586 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9587 if (LiteralName[0] != '_') { 9588 // C++11 [usrlit.suffix]p1: 9589 // Literal suffix identifiers that do not start with an underscore 9590 // are reserved for future standardization. 9591 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9592 } 9593 9594 return false; 9595} 9596 9597/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9598/// linkage specification, including the language and (if present) 9599/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9600/// the location of the language string literal, which is provided 9601/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9602/// the '{' brace. Otherwise, this linkage specification does not 9603/// have any braces. 9604Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9605 SourceLocation LangLoc, 9606 StringRef Lang, 9607 SourceLocation LBraceLoc) { 9608 LinkageSpecDecl::LanguageIDs Language; 9609 if (Lang == "\"C\"") 9610 Language = LinkageSpecDecl::lang_c; 9611 else if (Lang == "\"C++\"") 9612 Language = LinkageSpecDecl::lang_cxx; 9613 else { 9614 Diag(LangLoc, diag::err_bad_language); 9615 return 0; 9616 } 9617 9618 // FIXME: Add all the various semantics of linkage specifications 9619 9620 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9621 ExternLoc, LangLoc, Language); 9622 CurContext->addDecl(D); 9623 PushDeclContext(S, D); 9624 return D; 9625} 9626 9627/// ActOnFinishLinkageSpecification - Complete the definition of 9628/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9629/// valid, it's the position of the closing '}' brace in a linkage 9630/// specification that uses braces. 9631Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9632 Decl *LinkageSpec, 9633 SourceLocation RBraceLoc) { 9634 if (LinkageSpec) { 9635 if (RBraceLoc.isValid()) { 9636 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9637 LSDecl->setRBraceLoc(RBraceLoc); 9638 } 9639 PopDeclContext(); 9640 } 9641 return LinkageSpec; 9642} 9643 9644/// \brief Perform semantic analysis for the variable declaration that 9645/// occurs within a C++ catch clause, returning the newly-created 9646/// variable. 9647VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9648 TypeSourceInfo *TInfo, 9649 SourceLocation StartLoc, 9650 SourceLocation Loc, 9651 IdentifierInfo *Name) { 9652 bool Invalid = false; 9653 QualType ExDeclType = TInfo->getType(); 9654 9655 // Arrays and functions decay. 9656 if (ExDeclType->isArrayType()) 9657 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9658 else if (ExDeclType->isFunctionType()) 9659 ExDeclType = Context.getPointerType(ExDeclType); 9660 9661 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9662 // The exception-declaration shall not denote a pointer or reference to an 9663 // incomplete type, other than [cv] void*. 9664 // N2844 forbids rvalue references. 9665 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9666 Diag(Loc, diag::err_catch_rvalue_ref); 9667 Invalid = true; 9668 } 9669 9670 QualType BaseType = ExDeclType; 9671 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9672 unsigned DK = diag::err_catch_incomplete; 9673 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9674 BaseType = Ptr->getPointeeType(); 9675 Mode = 1; 9676 DK = diag::err_catch_incomplete_ptr; 9677 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9678 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9679 BaseType = Ref->getPointeeType(); 9680 Mode = 2; 9681 DK = diag::err_catch_incomplete_ref; 9682 } 9683 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9684 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 9685 Invalid = true; 9686 9687 if (!Invalid && !ExDeclType->isDependentType() && 9688 RequireNonAbstractType(Loc, ExDeclType, 9689 diag::err_abstract_type_in_decl, 9690 AbstractVariableType)) 9691 Invalid = true; 9692 9693 // Only the non-fragile NeXT runtime currently supports C++ catches 9694 // of ObjC types, and no runtime supports catching ObjC types by value. 9695 if (!Invalid && getLangOpts().ObjC1) { 9696 QualType T = ExDeclType; 9697 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9698 T = RT->getPointeeType(); 9699 9700 if (T->isObjCObjectType()) { 9701 Diag(Loc, diag::err_objc_object_catch); 9702 Invalid = true; 9703 } else if (T->isObjCObjectPointerType()) { 9704 if (!getLangOpts().ObjCNonFragileABI) 9705 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9706 } 9707 } 9708 9709 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9710 ExDeclType, TInfo, SC_None, SC_None); 9711 ExDecl->setExceptionVariable(true); 9712 9713 // In ARC, infer 'retaining' for variables of retainable type. 9714 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9715 Invalid = true; 9716 9717 if (!Invalid && !ExDeclType->isDependentType()) { 9718 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9719 // C++ [except.handle]p16: 9720 // The object declared in an exception-declaration or, if the 9721 // exception-declaration does not specify a name, a temporary (12.2) is 9722 // copy-initialized (8.5) from the exception object. [...] 9723 // The object is destroyed when the handler exits, after the destruction 9724 // of any automatic objects initialized within the handler. 9725 // 9726 // We just pretend to initialize the object with itself, then make sure 9727 // it can be destroyed later. 9728 QualType initType = ExDeclType; 9729 9730 InitializedEntity entity = 9731 InitializedEntity::InitializeVariable(ExDecl); 9732 InitializationKind initKind = 9733 InitializationKind::CreateCopy(Loc, SourceLocation()); 9734 9735 Expr *opaqueValue = 9736 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9737 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9738 ExprResult result = sequence.Perform(*this, entity, initKind, 9739 MultiExprArg(&opaqueValue, 1)); 9740 if (result.isInvalid()) 9741 Invalid = true; 9742 else { 9743 // If the constructor used was non-trivial, set this as the 9744 // "initializer". 9745 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9746 if (!construct->getConstructor()->isTrivial()) { 9747 Expr *init = MaybeCreateExprWithCleanups(construct); 9748 ExDecl->setInit(init); 9749 } 9750 9751 // And make sure it's destructable. 9752 FinalizeVarWithDestructor(ExDecl, recordType); 9753 } 9754 } 9755 } 9756 9757 if (Invalid) 9758 ExDecl->setInvalidDecl(); 9759 9760 return ExDecl; 9761} 9762 9763/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9764/// handler. 9765Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9766 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9767 bool Invalid = D.isInvalidType(); 9768 9769 // Check for unexpanded parameter packs. 9770 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9771 UPPC_ExceptionType)) { 9772 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9773 D.getIdentifierLoc()); 9774 Invalid = true; 9775 } 9776 9777 IdentifierInfo *II = D.getIdentifier(); 9778 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9779 LookupOrdinaryName, 9780 ForRedeclaration)) { 9781 // The scope should be freshly made just for us. There is just no way 9782 // it contains any previous declaration. 9783 assert(!S->isDeclScope(PrevDecl)); 9784 if (PrevDecl->isTemplateParameter()) { 9785 // Maybe we will complain about the shadowed template parameter. 9786 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9787 PrevDecl = 0; 9788 } 9789 } 9790 9791 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9792 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9793 << D.getCXXScopeSpec().getRange(); 9794 Invalid = true; 9795 } 9796 9797 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9798 D.getLocStart(), 9799 D.getIdentifierLoc(), 9800 D.getIdentifier()); 9801 if (Invalid) 9802 ExDecl->setInvalidDecl(); 9803 9804 // Add the exception declaration into this scope. 9805 if (II) 9806 PushOnScopeChains(ExDecl, S); 9807 else 9808 CurContext->addDecl(ExDecl); 9809 9810 ProcessDeclAttributes(S, ExDecl, D); 9811 return ExDecl; 9812} 9813 9814Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9815 Expr *AssertExpr, 9816 Expr *AssertMessageExpr_, 9817 SourceLocation RParenLoc) { 9818 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9819 9820 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9821 // In a static_assert-declaration, the constant-expression shall be a 9822 // constant expression that can be contextually converted to bool. 9823 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 9824 if (Converted.isInvalid()) 9825 return 0; 9826 9827 llvm::APSInt Cond; 9828 if (VerifyIntegerConstantExpression(Converted.get(), &Cond, 9829 PDiag(diag::err_static_assert_expression_is_not_constant), 9830 /*AllowFold=*/false).isInvalid()) 9831 return 0; 9832 9833 if (!Cond) { 9834 llvm::SmallString<256> MsgBuffer; 9835 llvm::raw_svector_ostream Msg(MsgBuffer); 9836 AssertMessage->printPretty(Msg, Context, 0, getPrintingPolicy()); 9837 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9838 << Msg.str() << AssertExpr->getSourceRange(); 9839 } 9840 } 9841 9842 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9843 return 0; 9844 9845 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9846 AssertExpr, AssertMessage, RParenLoc); 9847 9848 CurContext->addDecl(Decl); 9849 return Decl; 9850} 9851 9852/// \brief Perform semantic analysis of the given friend type declaration. 9853/// 9854/// \returns A friend declaration that. 9855FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc, 9856 SourceLocation FriendLoc, 9857 TypeSourceInfo *TSInfo) { 9858 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9859 9860 QualType T = TSInfo->getType(); 9861 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9862 9863 // C++03 [class.friend]p2: 9864 // An elaborated-type-specifier shall be used in a friend declaration 9865 // for a class.* 9866 // 9867 // * The class-key of the elaborated-type-specifier is required. 9868 if (!ActiveTemplateInstantiations.empty()) { 9869 // Do not complain about the form of friend template types during 9870 // template instantiation; we will already have complained when the 9871 // template was declared. 9872 } else if (!T->isElaboratedTypeSpecifier()) { 9873 // If we evaluated the type to a record type, suggest putting 9874 // a tag in front. 9875 if (const RecordType *RT = T->getAs<RecordType>()) { 9876 RecordDecl *RD = RT->getDecl(); 9877 9878 std::string InsertionText = std::string(" ") + RD->getKindName(); 9879 9880 Diag(TypeRange.getBegin(), 9881 getLangOpts().CPlusPlus0x ? 9882 diag::warn_cxx98_compat_unelaborated_friend_type : 9883 diag::ext_unelaborated_friend_type) 9884 << (unsigned) RD->getTagKind() 9885 << T 9886 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9887 InsertionText); 9888 } else { 9889 Diag(FriendLoc, 9890 getLangOpts().CPlusPlus0x ? 9891 diag::warn_cxx98_compat_nonclass_type_friend : 9892 diag::ext_nonclass_type_friend) 9893 << T 9894 << SourceRange(FriendLoc, TypeRange.getEnd()); 9895 } 9896 } else if (T->getAs<EnumType>()) { 9897 Diag(FriendLoc, 9898 getLangOpts().CPlusPlus0x ? 9899 diag::warn_cxx98_compat_enum_friend : 9900 diag::ext_enum_friend) 9901 << T 9902 << SourceRange(FriendLoc, TypeRange.getEnd()); 9903 } 9904 9905 // C++0x [class.friend]p3: 9906 // If the type specifier in a friend declaration designates a (possibly 9907 // cv-qualified) class type, that class is declared as a friend; otherwise, 9908 // the friend declaration is ignored. 9909 9910 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9911 // in [class.friend]p3 that we do not implement. 9912 9913 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc); 9914} 9915 9916/// Handle a friend tag declaration where the scope specifier was 9917/// templated. 9918Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9919 unsigned TagSpec, SourceLocation TagLoc, 9920 CXXScopeSpec &SS, 9921 IdentifierInfo *Name, SourceLocation NameLoc, 9922 AttributeList *Attr, 9923 MultiTemplateParamsArg TempParamLists) { 9924 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9925 9926 bool isExplicitSpecialization = false; 9927 bool Invalid = false; 9928 9929 if (TemplateParameterList *TemplateParams 9930 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9931 TempParamLists.get(), 9932 TempParamLists.size(), 9933 /*friend*/ true, 9934 isExplicitSpecialization, 9935 Invalid)) { 9936 if (TemplateParams->size() > 0) { 9937 // This is a declaration of a class template. 9938 if (Invalid) 9939 return 0; 9940 9941 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9942 SS, Name, NameLoc, Attr, 9943 TemplateParams, AS_public, 9944 /*ModulePrivateLoc=*/SourceLocation(), 9945 TempParamLists.size() - 1, 9946 (TemplateParameterList**) TempParamLists.release()).take(); 9947 } else { 9948 // The "template<>" header is extraneous. 9949 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9950 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9951 isExplicitSpecialization = true; 9952 } 9953 } 9954 9955 if (Invalid) return 0; 9956 9957 bool isAllExplicitSpecializations = true; 9958 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9959 if (TempParamLists.get()[I]->size()) { 9960 isAllExplicitSpecializations = false; 9961 break; 9962 } 9963 } 9964 9965 // FIXME: don't ignore attributes. 9966 9967 // If it's explicit specializations all the way down, just forget 9968 // about the template header and build an appropriate non-templated 9969 // friend. TODO: for source fidelity, remember the headers. 9970 if (isAllExplicitSpecializations) { 9971 if (SS.isEmpty()) { 9972 bool Owned = false; 9973 bool IsDependent = false; 9974 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 9975 Attr, AS_public, 9976 /*ModulePrivateLoc=*/SourceLocation(), 9977 MultiTemplateParamsArg(), Owned, IsDependent, 9978 /*ScopedEnumKWLoc=*/SourceLocation(), 9979 /*ScopedEnumUsesClassTag=*/false, 9980 /*UnderlyingType=*/TypeResult()); 9981 } 9982 9983 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9984 ElaboratedTypeKeyword Keyword 9985 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9986 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9987 *Name, NameLoc); 9988 if (T.isNull()) 9989 return 0; 9990 9991 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9992 if (isa<DependentNameType>(T)) { 9993 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9994 TL.setElaboratedKeywordLoc(TagLoc); 9995 TL.setQualifierLoc(QualifierLoc); 9996 TL.setNameLoc(NameLoc); 9997 } else { 9998 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9999 TL.setElaboratedKeywordLoc(TagLoc); 10000 TL.setQualifierLoc(QualifierLoc); 10001 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 10002 } 10003 10004 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10005 TSI, FriendLoc); 10006 Friend->setAccess(AS_public); 10007 CurContext->addDecl(Friend); 10008 return Friend; 10009 } 10010 10011 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 10012 10013 10014 10015 // Handle the case of a templated-scope friend class. e.g. 10016 // template <class T> class A<T>::B; 10017 // FIXME: we don't support these right now. 10018 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10019 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 10020 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10021 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10022 TL.setElaboratedKeywordLoc(TagLoc); 10023 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 10024 TL.setNameLoc(NameLoc); 10025 10026 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10027 TSI, FriendLoc); 10028 Friend->setAccess(AS_public); 10029 Friend->setUnsupportedFriend(true); 10030 CurContext->addDecl(Friend); 10031 return Friend; 10032} 10033 10034 10035/// Handle a friend type declaration. This works in tandem with 10036/// ActOnTag. 10037/// 10038/// Notes on friend class templates: 10039/// 10040/// We generally treat friend class declarations as if they were 10041/// declaring a class. So, for example, the elaborated type specifier 10042/// in a friend declaration is required to obey the restrictions of a 10043/// class-head (i.e. no typedefs in the scope chain), template 10044/// parameters are required to match up with simple template-ids, &c. 10045/// However, unlike when declaring a template specialization, it's 10046/// okay to refer to a template specialization without an empty 10047/// template parameter declaration, e.g. 10048/// friend class A<T>::B<unsigned>; 10049/// We permit this as a special case; if there are any template 10050/// parameters present at all, require proper matching, i.e. 10051/// template <> template <class T> friend class A<int>::B; 10052Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 10053 MultiTemplateParamsArg TempParams) { 10054 SourceLocation Loc = DS.getLocStart(); 10055 10056 assert(DS.isFriendSpecified()); 10057 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10058 10059 // Try to convert the decl specifier to a type. This works for 10060 // friend templates because ActOnTag never produces a ClassTemplateDecl 10061 // for a TUK_Friend. 10062 Declarator TheDeclarator(DS, Declarator::MemberContext); 10063 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 10064 QualType T = TSI->getType(); 10065 if (TheDeclarator.isInvalidType()) 10066 return 0; 10067 10068 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 10069 return 0; 10070 10071 // This is definitely an error in C++98. It's probably meant to 10072 // be forbidden in C++0x, too, but the specification is just 10073 // poorly written. 10074 // 10075 // The problem is with declarations like the following: 10076 // template <T> friend A<T>::foo; 10077 // where deciding whether a class C is a friend or not now hinges 10078 // on whether there exists an instantiation of A that causes 10079 // 'foo' to equal C. There are restrictions on class-heads 10080 // (which we declare (by fiat) elaborated friend declarations to 10081 // be) that makes this tractable. 10082 // 10083 // FIXME: handle "template <> friend class A<T>;", which 10084 // is possibly well-formed? Who even knows? 10085 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 10086 Diag(Loc, diag::err_tagless_friend_type_template) 10087 << DS.getSourceRange(); 10088 return 0; 10089 } 10090 10091 // C++98 [class.friend]p1: A friend of a class is a function 10092 // or class that is not a member of the class . . . 10093 // This is fixed in DR77, which just barely didn't make the C++03 10094 // deadline. It's also a very silly restriction that seriously 10095 // affects inner classes and which nobody else seems to implement; 10096 // thus we never diagnose it, not even in -pedantic. 10097 // 10098 // But note that we could warn about it: it's always useless to 10099 // friend one of your own members (it's not, however, worthless to 10100 // friend a member of an arbitrary specialization of your template). 10101 10102 Decl *D; 10103 if (unsigned NumTempParamLists = TempParams.size()) 10104 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10105 NumTempParamLists, 10106 TempParams.release(), 10107 TSI, 10108 DS.getFriendSpecLoc()); 10109 else 10110 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 10111 10112 if (!D) 10113 return 0; 10114 10115 D->setAccess(AS_public); 10116 CurContext->addDecl(D); 10117 10118 return D; 10119} 10120 10121Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 10122 MultiTemplateParamsArg TemplateParams) { 10123 const DeclSpec &DS = D.getDeclSpec(); 10124 10125 assert(DS.isFriendSpecified()); 10126 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10127 10128 SourceLocation Loc = D.getIdentifierLoc(); 10129 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10130 10131 // C++ [class.friend]p1 10132 // A friend of a class is a function or class.... 10133 // Note that this sees through typedefs, which is intended. 10134 // It *doesn't* see through dependent types, which is correct 10135 // according to [temp.arg.type]p3: 10136 // If a declaration acquires a function type through a 10137 // type dependent on a template-parameter and this causes 10138 // a declaration that does not use the syntactic form of a 10139 // function declarator to have a function type, the program 10140 // is ill-formed. 10141 if (!TInfo->getType()->isFunctionType()) { 10142 Diag(Loc, diag::err_unexpected_friend); 10143 10144 // It might be worthwhile to try to recover by creating an 10145 // appropriate declaration. 10146 return 0; 10147 } 10148 10149 // C++ [namespace.memdef]p3 10150 // - If a friend declaration in a non-local class first declares a 10151 // class or function, the friend class or function is a member 10152 // of the innermost enclosing namespace. 10153 // - The name of the friend is not found by simple name lookup 10154 // until a matching declaration is provided in that namespace 10155 // scope (either before or after the class declaration granting 10156 // friendship). 10157 // - If a friend function is called, its name may be found by the 10158 // name lookup that considers functions from namespaces and 10159 // classes associated with the types of the function arguments. 10160 // - When looking for a prior declaration of a class or a function 10161 // declared as a friend, scopes outside the innermost enclosing 10162 // namespace scope are not considered. 10163 10164 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10165 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10166 DeclarationName Name = NameInfo.getName(); 10167 assert(Name); 10168 10169 // Check for unexpanded parameter packs. 10170 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10171 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10172 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10173 return 0; 10174 10175 // The context we found the declaration in, or in which we should 10176 // create the declaration. 10177 DeclContext *DC; 10178 Scope *DCScope = S; 10179 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10180 ForRedeclaration); 10181 10182 // FIXME: there are different rules in local classes 10183 10184 // There are four cases here. 10185 // - There's no scope specifier, in which case we just go to the 10186 // appropriate scope and look for a function or function template 10187 // there as appropriate. 10188 // Recover from invalid scope qualifiers as if they just weren't there. 10189 if (SS.isInvalid() || !SS.isSet()) { 10190 // C++0x [namespace.memdef]p3: 10191 // If the name in a friend declaration is neither qualified nor 10192 // a template-id and the declaration is a function or an 10193 // elaborated-type-specifier, the lookup to determine whether 10194 // the entity has been previously declared shall not consider 10195 // any scopes outside the innermost enclosing namespace. 10196 // C++0x [class.friend]p11: 10197 // If a friend declaration appears in a local class and the name 10198 // specified is an unqualified name, a prior declaration is 10199 // looked up without considering scopes that are outside the 10200 // innermost enclosing non-class scope. For a friend function 10201 // declaration, if there is no prior declaration, the program is 10202 // ill-formed. 10203 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10204 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10205 10206 // Find the appropriate context according to the above. 10207 DC = CurContext; 10208 while (true) { 10209 // Skip class contexts. If someone can cite chapter and verse 10210 // for this behavior, that would be nice --- it's what GCC and 10211 // EDG do, and it seems like a reasonable intent, but the spec 10212 // really only says that checks for unqualified existing 10213 // declarations should stop at the nearest enclosing namespace, 10214 // not that they should only consider the nearest enclosing 10215 // namespace. 10216 while (DC->isRecord() || DC->isTransparentContext()) 10217 DC = DC->getParent(); 10218 10219 LookupQualifiedName(Previous, DC); 10220 10221 // TODO: decide what we think about using declarations. 10222 if (isLocal || !Previous.empty()) 10223 break; 10224 10225 if (isTemplateId) { 10226 if (isa<TranslationUnitDecl>(DC)) break; 10227 } else { 10228 if (DC->isFileContext()) break; 10229 } 10230 DC = DC->getParent(); 10231 } 10232 10233 // C++ [class.friend]p1: A friend of a class is a function or 10234 // class that is not a member of the class . . . 10235 // C++11 changes this for both friend types and functions. 10236 // Most C++ 98 compilers do seem to give an error here, so 10237 // we do, too. 10238 if (!Previous.empty() && DC->Equals(CurContext)) 10239 Diag(DS.getFriendSpecLoc(), 10240 getLangOpts().CPlusPlus0x ? 10241 diag::warn_cxx98_compat_friend_is_member : 10242 diag::err_friend_is_member); 10243 10244 DCScope = getScopeForDeclContext(S, DC); 10245 10246 // C++ [class.friend]p6: 10247 // A function can be defined in a friend declaration of a class if and 10248 // only if the class is a non-local class (9.8), the function name is 10249 // unqualified, and the function has namespace scope. 10250 if (isLocal && D.isFunctionDefinition()) { 10251 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10252 } 10253 10254 // - There's a non-dependent scope specifier, in which case we 10255 // compute it and do a previous lookup there for a function 10256 // or function template. 10257 } else if (!SS.getScopeRep()->isDependent()) { 10258 DC = computeDeclContext(SS); 10259 if (!DC) return 0; 10260 10261 if (RequireCompleteDeclContext(SS, DC)) return 0; 10262 10263 LookupQualifiedName(Previous, DC); 10264 10265 // Ignore things found implicitly in the wrong scope. 10266 // TODO: better diagnostics for this case. Suggesting the right 10267 // qualified scope would be nice... 10268 LookupResult::Filter F = Previous.makeFilter(); 10269 while (F.hasNext()) { 10270 NamedDecl *D = F.next(); 10271 if (!DC->InEnclosingNamespaceSetOf( 10272 D->getDeclContext()->getRedeclContext())) 10273 F.erase(); 10274 } 10275 F.done(); 10276 10277 if (Previous.empty()) { 10278 D.setInvalidType(); 10279 Diag(Loc, diag::err_qualified_friend_not_found) 10280 << Name << TInfo->getType(); 10281 return 0; 10282 } 10283 10284 // C++ [class.friend]p1: A friend of a class is a function or 10285 // class that is not a member of the class . . . 10286 if (DC->Equals(CurContext)) 10287 Diag(DS.getFriendSpecLoc(), 10288 getLangOpts().CPlusPlus0x ? 10289 diag::warn_cxx98_compat_friend_is_member : 10290 diag::err_friend_is_member); 10291 10292 if (D.isFunctionDefinition()) { 10293 // C++ [class.friend]p6: 10294 // A function can be defined in a friend declaration of a class if and 10295 // only if the class is a non-local class (9.8), the function name is 10296 // unqualified, and the function has namespace scope. 10297 SemaDiagnosticBuilder DB 10298 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10299 10300 DB << SS.getScopeRep(); 10301 if (DC->isFileContext()) 10302 DB << FixItHint::CreateRemoval(SS.getRange()); 10303 SS.clear(); 10304 } 10305 10306 // - There's a scope specifier that does not match any template 10307 // parameter lists, in which case we use some arbitrary context, 10308 // create a method or method template, and wait for instantiation. 10309 // - There's a scope specifier that does match some template 10310 // parameter lists, which we don't handle right now. 10311 } else { 10312 if (D.isFunctionDefinition()) { 10313 // C++ [class.friend]p6: 10314 // A function can be defined in a friend declaration of a class if and 10315 // only if the class is a non-local class (9.8), the function name is 10316 // unqualified, and the function has namespace scope. 10317 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10318 << SS.getScopeRep(); 10319 } 10320 10321 DC = CurContext; 10322 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10323 } 10324 10325 if (!DC->isRecord()) { 10326 // This implies that it has to be an operator or function. 10327 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10328 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10329 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10330 Diag(Loc, diag::err_introducing_special_friend) << 10331 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10332 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10333 return 0; 10334 } 10335 } 10336 10337 // FIXME: This is an egregious hack to cope with cases where the scope stack 10338 // does not contain the declaration context, i.e., in an out-of-line 10339 // definition of a class. 10340 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10341 if (!DCScope) { 10342 FakeDCScope.setEntity(DC); 10343 DCScope = &FakeDCScope; 10344 } 10345 10346 bool AddToScope = true; 10347 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10348 move(TemplateParams), AddToScope); 10349 if (!ND) return 0; 10350 10351 assert(ND->getDeclContext() == DC); 10352 assert(ND->getLexicalDeclContext() == CurContext); 10353 10354 // Add the function declaration to the appropriate lookup tables, 10355 // adjusting the redeclarations list as necessary. We don't 10356 // want to do this yet if the friending class is dependent. 10357 // 10358 // Also update the scope-based lookup if the target context's 10359 // lookup context is in lexical scope. 10360 if (!CurContext->isDependentContext()) { 10361 DC = DC->getRedeclContext(); 10362 DC->makeDeclVisibleInContext(ND); 10363 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10364 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10365 } 10366 10367 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10368 D.getIdentifierLoc(), ND, 10369 DS.getFriendSpecLoc()); 10370 FrD->setAccess(AS_public); 10371 CurContext->addDecl(FrD); 10372 10373 if (ND->isInvalidDecl()) 10374 FrD->setInvalidDecl(); 10375 else { 10376 FunctionDecl *FD; 10377 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10378 FD = FTD->getTemplatedDecl(); 10379 else 10380 FD = cast<FunctionDecl>(ND); 10381 10382 // Mark templated-scope function declarations as unsupported. 10383 if (FD->getNumTemplateParameterLists()) 10384 FrD->setUnsupportedFriend(true); 10385 } 10386 10387 return ND; 10388} 10389 10390void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10391 AdjustDeclIfTemplate(Dcl); 10392 10393 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10394 if (!Fn) { 10395 Diag(DelLoc, diag::err_deleted_non_function); 10396 return; 10397 } 10398 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10399 Diag(DelLoc, diag::err_deleted_decl_not_first); 10400 Diag(Prev->getLocation(), diag::note_previous_declaration); 10401 // If the declaration wasn't the first, we delete the function anyway for 10402 // recovery. 10403 } 10404 Fn->setDeletedAsWritten(); 10405 10406 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10407 if (!MD) 10408 return; 10409 10410 // A deleted special member function is trivial if the corresponding 10411 // implicitly-declared function would have been. 10412 switch (getSpecialMember(MD)) { 10413 case CXXInvalid: 10414 break; 10415 case CXXDefaultConstructor: 10416 MD->setTrivial(MD->getParent()->hasTrivialDefaultConstructor()); 10417 break; 10418 case CXXCopyConstructor: 10419 MD->setTrivial(MD->getParent()->hasTrivialCopyConstructor()); 10420 break; 10421 case CXXMoveConstructor: 10422 MD->setTrivial(MD->getParent()->hasTrivialMoveConstructor()); 10423 break; 10424 case CXXCopyAssignment: 10425 MD->setTrivial(MD->getParent()->hasTrivialCopyAssignment()); 10426 break; 10427 case CXXMoveAssignment: 10428 MD->setTrivial(MD->getParent()->hasTrivialMoveAssignment()); 10429 break; 10430 case CXXDestructor: 10431 MD->setTrivial(MD->getParent()->hasTrivialDestructor()); 10432 break; 10433 } 10434} 10435 10436void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10437 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10438 10439 if (MD) { 10440 if (MD->getParent()->isDependentType()) { 10441 MD->setDefaulted(); 10442 MD->setExplicitlyDefaulted(); 10443 return; 10444 } 10445 10446 CXXSpecialMember Member = getSpecialMember(MD); 10447 if (Member == CXXInvalid) { 10448 Diag(DefaultLoc, diag::err_default_special_members); 10449 return; 10450 } 10451 10452 MD->setDefaulted(); 10453 MD->setExplicitlyDefaulted(); 10454 10455 // If this definition appears within the record, do the checking when 10456 // the record is complete. 10457 const FunctionDecl *Primary = MD; 10458 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10459 // Find the uninstantiated declaration that actually had the '= default' 10460 // on it. 10461 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10462 10463 if (Primary == Primary->getCanonicalDecl()) 10464 return; 10465 10466 switch (Member) { 10467 case CXXDefaultConstructor: { 10468 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10469 CheckExplicitlyDefaultedDefaultConstructor(CD); 10470 if (!CD->isInvalidDecl()) 10471 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10472 break; 10473 } 10474 10475 case CXXCopyConstructor: { 10476 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10477 CheckExplicitlyDefaultedCopyConstructor(CD); 10478 if (!CD->isInvalidDecl()) 10479 DefineImplicitCopyConstructor(DefaultLoc, CD); 10480 break; 10481 } 10482 10483 case CXXCopyAssignment: { 10484 CheckExplicitlyDefaultedCopyAssignment(MD); 10485 if (!MD->isInvalidDecl()) 10486 DefineImplicitCopyAssignment(DefaultLoc, MD); 10487 break; 10488 } 10489 10490 case CXXDestructor: { 10491 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10492 CheckExplicitlyDefaultedDestructor(DD); 10493 if (!DD->isInvalidDecl()) 10494 DefineImplicitDestructor(DefaultLoc, DD); 10495 break; 10496 } 10497 10498 case CXXMoveConstructor: { 10499 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10500 CheckExplicitlyDefaultedMoveConstructor(CD); 10501 if (!CD->isInvalidDecl()) 10502 DefineImplicitMoveConstructor(DefaultLoc, CD); 10503 break; 10504 } 10505 10506 case CXXMoveAssignment: { 10507 CheckExplicitlyDefaultedMoveAssignment(MD); 10508 if (!MD->isInvalidDecl()) 10509 DefineImplicitMoveAssignment(DefaultLoc, MD); 10510 break; 10511 } 10512 10513 case CXXInvalid: 10514 llvm_unreachable("Invalid special member."); 10515 } 10516 } else { 10517 Diag(DefaultLoc, diag::err_default_special_members); 10518 } 10519} 10520 10521static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10522 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10523 Stmt *SubStmt = *CI; 10524 if (!SubStmt) 10525 continue; 10526 if (isa<ReturnStmt>(SubStmt)) 10527 Self.Diag(SubStmt->getLocStart(), 10528 diag::err_return_in_constructor_handler); 10529 if (!isa<Expr>(SubStmt)) 10530 SearchForReturnInStmt(Self, SubStmt); 10531 } 10532} 10533 10534void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10535 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10536 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10537 SearchForReturnInStmt(*this, Handler); 10538 } 10539} 10540 10541bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10542 const CXXMethodDecl *Old) { 10543 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10544 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10545 10546 if (Context.hasSameType(NewTy, OldTy) || 10547 NewTy->isDependentType() || OldTy->isDependentType()) 10548 return false; 10549 10550 // Check if the return types are covariant 10551 QualType NewClassTy, OldClassTy; 10552 10553 /// Both types must be pointers or references to classes. 10554 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10555 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10556 NewClassTy = NewPT->getPointeeType(); 10557 OldClassTy = OldPT->getPointeeType(); 10558 } 10559 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10560 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10561 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10562 NewClassTy = NewRT->getPointeeType(); 10563 OldClassTy = OldRT->getPointeeType(); 10564 } 10565 } 10566 } 10567 10568 // The return types aren't either both pointers or references to a class type. 10569 if (NewClassTy.isNull()) { 10570 Diag(New->getLocation(), 10571 diag::err_different_return_type_for_overriding_virtual_function) 10572 << New->getDeclName() << NewTy << OldTy; 10573 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10574 10575 return true; 10576 } 10577 10578 // C++ [class.virtual]p6: 10579 // If the return type of D::f differs from the return type of B::f, the 10580 // class type in the return type of D::f shall be complete at the point of 10581 // declaration of D::f or shall be the class type D. 10582 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10583 if (!RT->isBeingDefined() && 10584 RequireCompleteType(New->getLocation(), NewClassTy, 10585 PDiag(diag::err_covariant_return_incomplete) 10586 << New->getDeclName())) 10587 return true; 10588 } 10589 10590 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10591 // Check if the new class derives from the old class. 10592 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10593 Diag(New->getLocation(), 10594 diag::err_covariant_return_not_derived) 10595 << New->getDeclName() << NewTy << OldTy; 10596 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10597 return true; 10598 } 10599 10600 // Check if we the conversion from derived to base is valid. 10601 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10602 diag::err_covariant_return_inaccessible_base, 10603 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10604 // FIXME: Should this point to the return type? 10605 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10606 // FIXME: this note won't trigger for delayed access control 10607 // diagnostics, and it's impossible to get an undelayed error 10608 // here from access control during the original parse because 10609 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10610 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10611 return true; 10612 } 10613 } 10614 10615 // The qualifiers of the return types must be the same. 10616 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10617 Diag(New->getLocation(), 10618 diag::err_covariant_return_type_different_qualifications) 10619 << New->getDeclName() << NewTy << OldTy; 10620 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10621 return true; 10622 }; 10623 10624 10625 // The new class type must have the same or less qualifiers as the old type. 10626 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10627 Diag(New->getLocation(), 10628 diag::err_covariant_return_type_class_type_more_qualified) 10629 << New->getDeclName() << NewTy << OldTy; 10630 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10631 return true; 10632 }; 10633 10634 return false; 10635} 10636 10637/// \brief Mark the given method pure. 10638/// 10639/// \param Method the method to be marked pure. 10640/// 10641/// \param InitRange the source range that covers the "0" initializer. 10642bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10643 SourceLocation EndLoc = InitRange.getEnd(); 10644 if (EndLoc.isValid()) 10645 Method->setRangeEnd(EndLoc); 10646 10647 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10648 Method->setPure(); 10649 return false; 10650 } 10651 10652 if (!Method->isInvalidDecl()) 10653 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10654 << Method->getDeclName() << InitRange; 10655 return true; 10656} 10657 10658/// \brief Determine whether the given declaration is a static data member. 10659static bool isStaticDataMember(Decl *D) { 10660 VarDecl *Var = dyn_cast_or_null<VarDecl>(D); 10661 if (!Var) 10662 return false; 10663 10664 return Var->isStaticDataMember(); 10665} 10666/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10667/// an initializer for the out-of-line declaration 'Dcl'. The scope 10668/// is a fresh scope pushed for just this purpose. 10669/// 10670/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10671/// static data member of class X, names should be looked up in the scope of 10672/// class X. 10673void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10674 // If there is no declaration, there was an error parsing it. 10675 if (D == 0 || D->isInvalidDecl()) return; 10676 10677 // We should only get called for declarations with scope specifiers, like: 10678 // int foo::bar; 10679 assert(D->isOutOfLine()); 10680 EnterDeclaratorContext(S, D->getDeclContext()); 10681 10682 // If we are parsing the initializer for a static data member, push a 10683 // new expression evaluation context that is associated with this static 10684 // data member. 10685 if (isStaticDataMember(D)) 10686 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 10687} 10688 10689/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10690/// initializer for the out-of-line declaration 'D'. 10691void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10692 // If there is no declaration, there was an error parsing it. 10693 if (D == 0 || D->isInvalidDecl()) return; 10694 10695 if (isStaticDataMember(D)) 10696 PopExpressionEvaluationContext(); 10697 10698 assert(D->isOutOfLine()); 10699 ExitDeclaratorContext(S); 10700} 10701 10702/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10703/// C++ if/switch/while/for statement. 10704/// e.g: "if (int x = f()) {...}" 10705DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10706 // C++ 6.4p2: 10707 // The declarator shall not specify a function or an array. 10708 // The type-specifier-seq shall not contain typedef and shall not declare a 10709 // new class or enumeration. 10710 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10711 "Parser allowed 'typedef' as storage class of condition decl."); 10712 10713 Decl *Dcl = ActOnDeclarator(S, D); 10714 if (!Dcl) 10715 return true; 10716 10717 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10718 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10719 << D.getSourceRange(); 10720 return true; 10721 } 10722 10723 return Dcl; 10724} 10725 10726void Sema::LoadExternalVTableUses() { 10727 if (!ExternalSource) 10728 return; 10729 10730 SmallVector<ExternalVTableUse, 4> VTables; 10731 ExternalSource->ReadUsedVTables(VTables); 10732 SmallVector<VTableUse, 4> NewUses; 10733 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10734 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10735 = VTablesUsed.find(VTables[I].Record); 10736 // Even if a definition wasn't required before, it may be required now. 10737 if (Pos != VTablesUsed.end()) { 10738 if (!Pos->second && VTables[I].DefinitionRequired) 10739 Pos->second = true; 10740 continue; 10741 } 10742 10743 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10744 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10745 } 10746 10747 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10748} 10749 10750void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10751 bool DefinitionRequired) { 10752 // Ignore any vtable uses in unevaluated operands or for classes that do 10753 // not have a vtable. 10754 if (!Class->isDynamicClass() || Class->isDependentContext() || 10755 CurContext->isDependentContext() || 10756 ExprEvalContexts.back().Context == Unevaluated) 10757 return; 10758 10759 // Try to insert this class into the map. 10760 LoadExternalVTableUses(); 10761 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10762 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10763 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10764 if (!Pos.second) { 10765 // If we already had an entry, check to see if we are promoting this vtable 10766 // to required a definition. If so, we need to reappend to the VTableUses 10767 // list, since we may have already processed the first entry. 10768 if (DefinitionRequired && !Pos.first->second) { 10769 Pos.first->second = true; 10770 } else { 10771 // Otherwise, we can early exit. 10772 return; 10773 } 10774 } 10775 10776 // Local classes need to have their virtual members marked 10777 // immediately. For all other classes, we mark their virtual members 10778 // at the end of the translation unit. 10779 if (Class->isLocalClass()) 10780 MarkVirtualMembersReferenced(Loc, Class); 10781 else 10782 VTableUses.push_back(std::make_pair(Class, Loc)); 10783} 10784 10785bool Sema::DefineUsedVTables() { 10786 LoadExternalVTableUses(); 10787 if (VTableUses.empty()) 10788 return false; 10789 10790 // Note: The VTableUses vector could grow as a result of marking 10791 // the members of a class as "used", so we check the size each 10792 // time through the loop and prefer indices (with are stable) to 10793 // iterators (which are not). 10794 bool DefinedAnything = false; 10795 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10796 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10797 if (!Class) 10798 continue; 10799 10800 SourceLocation Loc = VTableUses[I].second; 10801 10802 // If this class has a key function, but that key function is 10803 // defined in another translation unit, we don't need to emit the 10804 // vtable even though we're using it. 10805 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10806 if (KeyFunction && !KeyFunction->hasBody()) { 10807 switch (KeyFunction->getTemplateSpecializationKind()) { 10808 case TSK_Undeclared: 10809 case TSK_ExplicitSpecialization: 10810 case TSK_ExplicitInstantiationDeclaration: 10811 // The key function is in another translation unit. 10812 continue; 10813 10814 case TSK_ExplicitInstantiationDefinition: 10815 case TSK_ImplicitInstantiation: 10816 // We will be instantiating the key function. 10817 break; 10818 } 10819 } else if (!KeyFunction) { 10820 // If we have a class with no key function that is the subject 10821 // of an explicit instantiation declaration, suppress the 10822 // vtable; it will live with the explicit instantiation 10823 // definition. 10824 bool IsExplicitInstantiationDeclaration 10825 = Class->getTemplateSpecializationKind() 10826 == TSK_ExplicitInstantiationDeclaration; 10827 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10828 REnd = Class->redecls_end(); 10829 R != REnd; ++R) { 10830 TemplateSpecializationKind TSK 10831 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10832 if (TSK == TSK_ExplicitInstantiationDeclaration) 10833 IsExplicitInstantiationDeclaration = true; 10834 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10835 IsExplicitInstantiationDeclaration = false; 10836 break; 10837 } 10838 } 10839 10840 if (IsExplicitInstantiationDeclaration) 10841 continue; 10842 } 10843 10844 // Mark all of the virtual members of this class as referenced, so 10845 // that we can build a vtable. Then, tell the AST consumer that a 10846 // vtable for this class is required. 10847 DefinedAnything = true; 10848 MarkVirtualMembersReferenced(Loc, Class); 10849 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10850 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10851 10852 // Optionally warn if we're emitting a weak vtable. 10853 if (Class->getLinkage() == ExternalLinkage && 10854 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10855 const FunctionDecl *KeyFunctionDef = 0; 10856 if (!KeyFunction || 10857 (KeyFunction->hasBody(KeyFunctionDef) && 10858 KeyFunctionDef->isInlined())) 10859 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10860 TSK_ExplicitInstantiationDefinition 10861 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10862 << Class; 10863 } 10864 } 10865 VTableUses.clear(); 10866 10867 return DefinedAnything; 10868} 10869 10870void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10871 const CXXRecordDecl *RD) { 10872 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10873 e = RD->method_end(); i != e; ++i) { 10874 CXXMethodDecl *MD = *i; 10875 10876 // C++ [basic.def.odr]p2: 10877 // [...] A virtual member function is used if it is not pure. [...] 10878 if (MD->isVirtual() && !MD->isPure()) 10879 MarkFunctionReferenced(Loc, MD); 10880 } 10881 10882 // Only classes that have virtual bases need a VTT. 10883 if (RD->getNumVBases() == 0) 10884 return; 10885 10886 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10887 e = RD->bases_end(); i != e; ++i) { 10888 const CXXRecordDecl *Base = 10889 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10890 if (Base->getNumVBases() == 0) 10891 continue; 10892 MarkVirtualMembersReferenced(Loc, Base); 10893 } 10894} 10895 10896/// SetIvarInitializers - This routine builds initialization ASTs for the 10897/// Objective-C implementation whose ivars need be initialized. 10898void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10899 if (!getLangOpts().CPlusPlus) 10900 return; 10901 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10902 SmallVector<ObjCIvarDecl*, 8> ivars; 10903 CollectIvarsToConstructOrDestruct(OID, ivars); 10904 if (ivars.empty()) 10905 return; 10906 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10907 for (unsigned i = 0; i < ivars.size(); i++) { 10908 FieldDecl *Field = ivars[i]; 10909 if (Field->isInvalidDecl()) 10910 continue; 10911 10912 CXXCtorInitializer *Member; 10913 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10914 InitializationKind InitKind = 10915 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10916 10917 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10918 ExprResult MemberInit = 10919 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10920 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10921 // Note, MemberInit could actually come back empty if no initialization 10922 // is required (e.g., because it would call a trivial default constructor) 10923 if (!MemberInit.get() || MemberInit.isInvalid()) 10924 continue; 10925 10926 Member = 10927 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10928 SourceLocation(), 10929 MemberInit.takeAs<Expr>(), 10930 SourceLocation()); 10931 AllToInit.push_back(Member); 10932 10933 // Be sure that the destructor is accessible and is marked as referenced. 10934 if (const RecordType *RecordTy 10935 = Context.getBaseElementType(Field->getType()) 10936 ->getAs<RecordType>()) { 10937 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10938 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10939 MarkFunctionReferenced(Field->getLocation(), Destructor); 10940 CheckDestructorAccess(Field->getLocation(), Destructor, 10941 PDiag(diag::err_access_dtor_ivar) 10942 << Context.getBaseElementType(Field->getType())); 10943 } 10944 } 10945 } 10946 ObjCImplementation->setIvarInitializers(Context, 10947 AllToInit.data(), AllToInit.size()); 10948 } 10949} 10950 10951static 10952void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10953 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10954 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10955 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10956 Sema &S) { 10957 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10958 CE = Current.end(); 10959 if (Ctor->isInvalidDecl()) 10960 return; 10961 10962 const FunctionDecl *FNTarget = 0; 10963 CXXConstructorDecl *Target; 10964 10965 // We ignore the result here since if we don't have a body, Target will be 10966 // null below. 10967 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10968 Target 10969= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10970 10971 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10972 // Avoid dereferencing a null pointer here. 10973 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10974 10975 if (!Current.insert(Canonical)) 10976 return; 10977 10978 // We know that beyond here, we aren't chaining into a cycle. 10979 if (!Target || !Target->isDelegatingConstructor() || 10980 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10981 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10982 Valid.insert(*CI); 10983 Current.clear(); 10984 // We've hit a cycle. 10985 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 10986 Current.count(TCanonical)) { 10987 // If we haven't diagnosed this cycle yet, do so now. 10988 if (!Invalid.count(TCanonical)) { 10989 S.Diag((*Ctor->init_begin())->getSourceLocation(), 10990 diag::warn_delegating_ctor_cycle) 10991 << Ctor; 10992 10993 // Don't add a note for a function delegating directo to itself. 10994 if (TCanonical != Canonical) 10995 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 10996 10997 CXXConstructorDecl *C = Target; 10998 while (C->getCanonicalDecl() != Canonical) { 10999 (void)C->getTargetConstructor()->hasBody(FNTarget); 11000 assert(FNTarget && "Ctor cycle through bodiless function"); 11001 11002 C 11003 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 11004 S.Diag(C->getLocation(), diag::note_which_delegates_to); 11005 } 11006 } 11007 11008 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11009 Invalid.insert(*CI); 11010 Current.clear(); 11011 } else { 11012 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 11013 } 11014} 11015 11016 11017void Sema::CheckDelegatingCtorCycles() { 11018 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 11019 11020 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11021 CE = Current.end(); 11022 11023 for (DelegatingCtorDeclsType::iterator 11024 I = DelegatingCtorDecls.begin(ExternalSource), 11025 E = DelegatingCtorDecls.end(); 11026 I != E; ++I) { 11027 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 11028 } 11029 11030 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 11031 (*CI)->setInvalidDecl(); 11032} 11033 11034/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 11035Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 11036 // Implicitly declared functions (e.g. copy constructors) are 11037 // __host__ __device__ 11038 if (D->isImplicit()) 11039 return CFT_HostDevice; 11040 11041 if (D->hasAttr<CUDAGlobalAttr>()) 11042 return CFT_Global; 11043 11044 if (D->hasAttr<CUDADeviceAttr>()) { 11045 if (D->hasAttr<CUDAHostAttr>()) 11046 return CFT_HostDevice; 11047 else 11048 return CFT_Device; 11049 } 11050 11051 return CFT_Host; 11052} 11053 11054bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 11055 CUDAFunctionTarget CalleeTarget) { 11056 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 11057 // Callable from the device only." 11058 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 11059 return true; 11060 11061 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 11062 // Callable from the host only." 11063 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 11064 // Callable from the host only." 11065 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 11066 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 11067 return true; 11068 11069 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 11070 return true; 11071 11072 return false; 11073} 11074