SemaDeclCXX.cpp revision 9cda03ff7fc40b727d0cc44b1702dbae09d63f42
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 DeclContext *DC = 0; 1542 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1543 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1544 << Name << FixItHint::CreateRemoval(SS.getRange()); 1545 else 1546 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1547 << Name << SS.getRange(); 1548 1549 SS.clear(); 1550 } 1551 1552 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1553 HasDeferredInit, AS); 1554 assert(Member && "HandleField never returns null"); 1555 } else { 1556 assert(!HasDeferredInit); 1557 1558 Member = HandleDeclarator(S, D, move(TemplateParameterLists)); 1559 if (!Member) { 1560 return 0; 1561 } 1562 1563 // Non-instance-fields can't have a bitfield. 1564 if (BitWidth) { 1565 if (Member->isInvalidDecl()) { 1566 // don't emit another diagnostic. 1567 } else if (isa<VarDecl>(Member)) { 1568 // C++ 9.6p3: A bit-field shall not be a static member. 1569 // "static member 'A' cannot be a bit-field" 1570 Diag(Loc, diag::err_static_not_bitfield) 1571 << Name << BitWidth->getSourceRange(); 1572 } else if (isa<TypedefDecl>(Member)) { 1573 // "typedef member 'x' cannot be a bit-field" 1574 Diag(Loc, diag::err_typedef_not_bitfield) 1575 << Name << BitWidth->getSourceRange(); 1576 } else { 1577 // A function typedef ("typedef int f(); f a;"). 1578 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1579 Diag(Loc, diag::err_not_integral_type_bitfield) 1580 << Name << cast<ValueDecl>(Member)->getType() 1581 << BitWidth->getSourceRange(); 1582 } 1583 1584 BitWidth = 0; 1585 Member->setInvalidDecl(); 1586 } 1587 1588 Member->setAccess(AS); 1589 1590 // If we have declared a member function template, set the access of the 1591 // templated declaration as well. 1592 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1593 FunTmpl->getTemplatedDecl()->setAccess(AS); 1594 } 1595 1596 if (VS.isOverrideSpecified()) { 1597 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1598 if (!MD || !MD->isVirtual()) { 1599 Diag(Member->getLocStart(), 1600 diag::override_keyword_only_allowed_on_virtual_member_functions) 1601 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1602 } else 1603 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1604 } 1605 if (VS.isFinalSpecified()) { 1606 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1607 if (!MD || !MD->isVirtual()) { 1608 Diag(Member->getLocStart(), 1609 diag::override_keyword_only_allowed_on_virtual_member_functions) 1610 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1611 } else 1612 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1613 } 1614 1615 if (VS.getLastLocation().isValid()) { 1616 // Update the end location of a method that has a virt-specifiers. 1617 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1618 MD->setRangeEnd(VS.getLastLocation()); 1619 } 1620 1621 CheckOverrideControl(Member); 1622 1623 assert((Name || isInstField) && "No identifier for non-field ?"); 1624 1625 if (isInstField) 1626 FieldCollector->Add(cast<FieldDecl>(Member)); 1627 return Member; 1628} 1629 1630/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1631/// in-class initializer for a non-static C++ class member, and after 1632/// instantiating an in-class initializer in a class template. Such actions 1633/// are deferred until the class is complete. 1634void 1635Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation EqualLoc, 1636 Expr *InitExpr) { 1637 FieldDecl *FD = cast<FieldDecl>(D); 1638 1639 if (!InitExpr) { 1640 FD->setInvalidDecl(); 1641 FD->removeInClassInitializer(); 1642 return; 1643 } 1644 1645 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1646 FD->setInvalidDecl(); 1647 FD->removeInClassInitializer(); 1648 return; 1649 } 1650 1651 ExprResult Init = InitExpr; 1652 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1653 if (isa<InitListExpr>(InitExpr) && isStdInitializerList(FD->getType(), 0)) { 1654 Diag(FD->getLocation(), diag::warn_dangling_std_initializer_list) 1655 << /*at end of ctor*/1 << InitExpr->getSourceRange(); 1656 } 1657 Expr **Inits = &InitExpr; 1658 unsigned NumInits = 1; 1659 InitializedEntity Entity = InitializedEntity::InitializeMember(FD); 1660 InitializationKind Kind = EqualLoc.isInvalid() 1661 ? InitializationKind::CreateDirectList(InitExpr->getLocStart()) 1662 : InitializationKind::CreateCopy(InitExpr->getLocStart(), EqualLoc); 1663 InitializationSequence Seq(*this, Entity, Kind, Inits, NumInits); 1664 Init = Seq.Perform(*this, Entity, Kind, MultiExprArg(Inits, NumInits)); 1665 if (Init.isInvalid()) { 1666 FD->setInvalidDecl(); 1667 return; 1668 } 1669 1670 CheckImplicitConversions(Init.get(), EqualLoc); 1671 } 1672 1673 // C++0x [class.base.init]p7: 1674 // The initialization of each base and member constitutes a 1675 // full-expression. 1676 Init = MaybeCreateExprWithCleanups(Init); 1677 if (Init.isInvalid()) { 1678 FD->setInvalidDecl(); 1679 return; 1680 } 1681 1682 InitExpr = Init.release(); 1683 1684 FD->setInClassInitializer(InitExpr); 1685} 1686 1687/// \brief Find the direct and/or virtual base specifiers that 1688/// correspond to the given base type, for use in base initialization 1689/// within a constructor. 1690static bool FindBaseInitializer(Sema &SemaRef, 1691 CXXRecordDecl *ClassDecl, 1692 QualType BaseType, 1693 const CXXBaseSpecifier *&DirectBaseSpec, 1694 const CXXBaseSpecifier *&VirtualBaseSpec) { 1695 // First, check for a direct base class. 1696 DirectBaseSpec = 0; 1697 for (CXXRecordDecl::base_class_const_iterator Base 1698 = ClassDecl->bases_begin(); 1699 Base != ClassDecl->bases_end(); ++Base) { 1700 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1701 // We found a direct base of this type. That's what we're 1702 // initializing. 1703 DirectBaseSpec = &*Base; 1704 break; 1705 } 1706 } 1707 1708 // Check for a virtual base class. 1709 // FIXME: We might be able to short-circuit this if we know in advance that 1710 // there are no virtual bases. 1711 VirtualBaseSpec = 0; 1712 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1713 // We haven't found a base yet; search the class hierarchy for a 1714 // virtual base class. 1715 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1716 /*DetectVirtual=*/false); 1717 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1718 BaseType, Paths)) { 1719 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1720 Path != Paths.end(); ++Path) { 1721 if (Path->back().Base->isVirtual()) { 1722 VirtualBaseSpec = Path->back().Base; 1723 break; 1724 } 1725 } 1726 } 1727 } 1728 1729 return DirectBaseSpec || VirtualBaseSpec; 1730} 1731 1732/// \brief Handle a C++ member initializer using braced-init-list syntax. 1733MemInitResult 1734Sema::ActOnMemInitializer(Decl *ConstructorD, 1735 Scope *S, 1736 CXXScopeSpec &SS, 1737 IdentifierInfo *MemberOrBase, 1738 ParsedType TemplateTypeTy, 1739 const DeclSpec &DS, 1740 SourceLocation IdLoc, 1741 Expr *InitList, 1742 SourceLocation EllipsisLoc) { 1743 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1744 DS, IdLoc, InitList, 1745 EllipsisLoc); 1746} 1747 1748/// \brief Handle a C++ member initializer using parentheses syntax. 1749MemInitResult 1750Sema::ActOnMemInitializer(Decl *ConstructorD, 1751 Scope *S, 1752 CXXScopeSpec &SS, 1753 IdentifierInfo *MemberOrBase, 1754 ParsedType TemplateTypeTy, 1755 const DeclSpec &DS, 1756 SourceLocation IdLoc, 1757 SourceLocation LParenLoc, 1758 Expr **Args, unsigned NumArgs, 1759 SourceLocation RParenLoc, 1760 SourceLocation EllipsisLoc) { 1761 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1762 RParenLoc); 1763 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1764 DS, IdLoc, List, EllipsisLoc); 1765} 1766 1767namespace { 1768 1769// Callback to only accept typo corrections that can be a valid C++ member 1770// intializer: either a non-static field member or a base class. 1771class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 1772 public: 1773 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 1774 : ClassDecl(ClassDecl) {} 1775 1776 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 1777 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 1778 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 1779 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 1780 else 1781 return isa<TypeDecl>(ND); 1782 } 1783 return false; 1784 } 1785 1786 private: 1787 CXXRecordDecl *ClassDecl; 1788}; 1789 1790} 1791 1792/// \brief Handle a C++ member initializer. 1793MemInitResult 1794Sema::BuildMemInitializer(Decl *ConstructorD, 1795 Scope *S, 1796 CXXScopeSpec &SS, 1797 IdentifierInfo *MemberOrBase, 1798 ParsedType TemplateTypeTy, 1799 const DeclSpec &DS, 1800 SourceLocation IdLoc, 1801 Expr *Init, 1802 SourceLocation EllipsisLoc) { 1803 if (!ConstructorD) 1804 return true; 1805 1806 AdjustDeclIfTemplate(ConstructorD); 1807 1808 CXXConstructorDecl *Constructor 1809 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1810 if (!Constructor) { 1811 // The user wrote a constructor initializer on a function that is 1812 // not a C++ constructor. Ignore the error for now, because we may 1813 // have more member initializers coming; we'll diagnose it just 1814 // once in ActOnMemInitializers. 1815 return true; 1816 } 1817 1818 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1819 1820 // C++ [class.base.init]p2: 1821 // Names in a mem-initializer-id are looked up in the scope of the 1822 // constructor's class and, if not found in that scope, are looked 1823 // up in the scope containing the constructor's definition. 1824 // [Note: if the constructor's class contains a member with the 1825 // same name as a direct or virtual base class of the class, a 1826 // mem-initializer-id naming the member or base class and composed 1827 // of a single identifier refers to the class member. A 1828 // mem-initializer-id for the hidden base class may be specified 1829 // using a qualified name. ] 1830 if (!SS.getScopeRep() && !TemplateTypeTy) { 1831 // Look for a member, first. 1832 DeclContext::lookup_result Result 1833 = ClassDecl->lookup(MemberOrBase); 1834 if (Result.first != Result.second) { 1835 ValueDecl *Member; 1836 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 1837 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 1838 if (EllipsisLoc.isValid()) 1839 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1840 << MemberOrBase 1841 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 1842 1843 return BuildMemberInitializer(Member, Init, IdLoc); 1844 } 1845 } 1846 } 1847 // It didn't name a member, so see if it names a class. 1848 QualType BaseType; 1849 TypeSourceInfo *TInfo = 0; 1850 1851 if (TemplateTypeTy) { 1852 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1853 } else if (DS.getTypeSpecType() == TST_decltype) { 1854 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 1855 } else { 1856 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1857 LookupParsedName(R, S, &SS); 1858 1859 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1860 if (!TyD) { 1861 if (R.isAmbiguous()) return true; 1862 1863 // We don't want access-control diagnostics here. 1864 R.suppressDiagnostics(); 1865 1866 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1867 bool NotUnknownSpecialization = false; 1868 DeclContext *DC = computeDeclContext(SS, false); 1869 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1870 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1871 1872 if (!NotUnknownSpecialization) { 1873 // When the scope specifier can refer to a member of an unknown 1874 // specialization, we take it as a type name. 1875 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1876 SS.getWithLocInContext(Context), 1877 *MemberOrBase, IdLoc); 1878 if (BaseType.isNull()) 1879 return true; 1880 1881 R.clear(); 1882 R.setLookupName(MemberOrBase); 1883 } 1884 } 1885 1886 // If no results were found, try to correct typos. 1887 TypoCorrection Corr; 1888 MemInitializerValidatorCCC Validator(ClassDecl); 1889 if (R.empty() && BaseType.isNull() && 1890 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1891 Validator, ClassDecl))) { 1892 std::string CorrectedStr(Corr.getAsString(getLangOpts())); 1893 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOpts())); 1894 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1895 // We have found a non-static data member with a similar 1896 // name to what was typed; complain and initialize that 1897 // member. 1898 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1899 << MemberOrBase << true << CorrectedQuotedStr 1900 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1901 Diag(Member->getLocation(), diag::note_previous_decl) 1902 << CorrectedQuotedStr; 1903 1904 return BuildMemberInitializer(Member, Init, IdLoc); 1905 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1906 const CXXBaseSpecifier *DirectBaseSpec; 1907 const CXXBaseSpecifier *VirtualBaseSpec; 1908 if (FindBaseInitializer(*this, ClassDecl, 1909 Context.getTypeDeclType(Type), 1910 DirectBaseSpec, VirtualBaseSpec)) { 1911 // We have found a direct or virtual base class with a 1912 // similar name to what was typed; complain and initialize 1913 // that base class. 1914 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1915 << MemberOrBase << false << CorrectedQuotedStr 1916 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1917 1918 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1919 : VirtualBaseSpec; 1920 Diag(BaseSpec->getLocStart(), 1921 diag::note_base_class_specified_here) 1922 << BaseSpec->getType() 1923 << BaseSpec->getSourceRange(); 1924 1925 TyD = Type; 1926 } 1927 } 1928 } 1929 1930 if (!TyD && BaseType.isNull()) { 1931 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1932 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 1933 return true; 1934 } 1935 } 1936 1937 if (BaseType.isNull()) { 1938 BaseType = Context.getTypeDeclType(TyD); 1939 if (SS.isSet()) { 1940 NestedNameSpecifier *Qualifier = 1941 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1942 1943 // FIXME: preserve source range information 1944 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1945 } 1946 } 1947 } 1948 1949 if (!TInfo) 1950 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1951 1952 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 1953} 1954 1955/// Checks a member initializer expression for cases where reference (or 1956/// pointer) members are bound to by-value parameters (or their addresses). 1957static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 1958 Expr *Init, 1959 SourceLocation IdLoc) { 1960 QualType MemberTy = Member->getType(); 1961 1962 // We only handle pointers and references currently. 1963 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 1964 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 1965 return; 1966 1967 const bool IsPointer = MemberTy->isPointerType(); 1968 if (IsPointer) { 1969 if (const UnaryOperator *Op 1970 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 1971 // The only case we're worried about with pointers requires taking the 1972 // address. 1973 if (Op->getOpcode() != UO_AddrOf) 1974 return; 1975 1976 Init = Op->getSubExpr(); 1977 } else { 1978 // We only handle address-of expression initializers for pointers. 1979 return; 1980 } 1981 } 1982 1983 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 1984 // Taking the address of a temporary will be diagnosed as a hard error. 1985 if (IsPointer) 1986 return; 1987 1988 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 1989 << Member << Init->getSourceRange(); 1990 } else if (const DeclRefExpr *DRE 1991 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 1992 // We only warn when referring to a non-reference parameter declaration. 1993 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 1994 if (!Parameter || Parameter->getType()->isReferenceType()) 1995 return; 1996 1997 S.Diag(Init->getExprLoc(), 1998 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 1999 : diag::warn_bind_ref_member_to_parameter) 2000 << Member << Parameter << Init->getSourceRange(); 2001 } else { 2002 // Other initializers are fine. 2003 return; 2004 } 2005 2006 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 2007 << (unsigned)IsPointer; 2008} 2009 2010/// Checks an initializer expression for use of uninitialized fields, such as 2011/// containing the field that is being initialized. Returns true if there is an 2012/// uninitialized field was used an updates the SourceLocation parameter; false 2013/// otherwise. 2014static bool InitExprContainsUninitializedFields(const Stmt *S, 2015 const ValueDecl *LhsField, 2016 SourceLocation *L) { 2017 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 2018 2019 if (isa<CallExpr>(S)) { 2020 // Do not descend into function calls or constructors, as the use 2021 // of an uninitialized field may be valid. One would have to inspect 2022 // the contents of the function/ctor to determine if it is safe or not. 2023 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 2024 // may be safe, depending on what the function/ctor does. 2025 return false; 2026 } 2027 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 2028 const NamedDecl *RhsField = ME->getMemberDecl(); 2029 2030 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 2031 // The member expression points to a static data member. 2032 assert(VD->isStaticDataMember() && 2033 "Member points to non-static data member!"); 2034 (void)VD; 2035 return false; 2036 } 2037 2038 if (isa<EnumConstantDecl>(RhsField)) { 2039 // The member expression points to an enum. 2040 return false; 2041 } 2042 2043 if (RhsField == LhsField) { 2044 // Initializing a field with itself. Throw a warning. 2045 // But wait; there are exceptions! 2046 // Exception #1: The field may not belong to this record. 2047 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 2048 const Expr *base = ME->getBase(); 2049 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 2050 // Even though the field matches, it does not belong to this record. 2051 return false; 2052 } 2053 // None of the exceptions triggered; return true to indicate an 2054 // uninitialized field was used. 2055 *L = ME->getMemberLoc(); 2056 return true; 2057 } 2058 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 2059 // sizeof/alignof doesn't reference contents, do not warn. 2060 return false; 2061 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 2062 // address-of doesn't reference contents (the pointer may be dereferenced 2063 // in the same expression but it would be rare; and weird). 2064 if (UOE->getOpcode() == UO_AddrOf) 2065 return false; 2066 } 2067 for (Stmt::const_child_range it = S->children(); it; ++it) { 2068 if (!*it) { 2069 // An expression such as 'member(arg ?: "")' may trigger this. 2070 continue; 2071 } 2072 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 2073 return true; 2074 } 2075 return false; 2076} 2077 2078MemInitResult 2079Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2080 SourceLocation IdLoc) { 2081 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2082 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2083 assert((DirectMember || IndirectMember) && 2084 "Member must be a FieldDecl or IndirectFieldDecl"); 2085 2086 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2087 return true; 2088 2089 if (Member->isInvalidDecl()) 2090 return true; 2091 2092 // Diagnose value-uses of fields to initialize themselves, e.g. 2093 // foo(foo) 2094 // where foo is not also a parameter to the constructor. 2095 // TODO: implement -Wuninitialized and fold this into that framework. 2096 Expr **Args; 2097 unsigned NumArgs; 2098 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2099 Args = ParenList->getExprs(); 2100 NumArgs = ParenList->getNumExprs(); 2101 } else { 2102 InitListExpr *InitList = cast<InitListExpr>(Init); 2103 Args = InitList->getInits(); 2104 NumArgs = InitList->getNumInits(); 2105 } 2106 for (unsigned i = 0; i < NumArgs; ++i) { 2107 SourceLocation L; 2108 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 2109 // FIXME: Return true in the case when other fields are used before being 2110 // uninitialized. For example, let this field be the i'th field. When 2111 // initializing the i'th field, throw a warning if any of the >= i'th 2112 // fields are used, as they are not yet initialized. 2113 // Right now we are only handling the case where the i'th field uses 2114 // itself in its initializer. 2115 Diag(L, diag::warn_field_is_uninit); 2116 } 2117 } 2118 2119 SourceRange InitRange = Init->getSourceRange(); 2120 2121 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2122 // Can't check initialization for a member of dependent type or when 2123 // any of the arguments are type-dependent expressions. 2124 DiscardCleanupsInEvaluationContext(); 2125 } else { 2126 bool InitList = false; 2127 if (isa<InitListExpr>(Init)) { 2128 InitList = true; 2129 Args = &Init; 2130 NumArgs = 1; 2131 2132 if (isStdInitializerList(Member->getType(), 0)) { 2133 Diag(IdLoc, diag::warn_dangling_std_initializer_list) 2134 << /*at end of ctor*/1 << InitRange; 2135 } 2136 } 2137 2138 // Initialize the member. 2139 InitializedEntity MemberEntity = 2140 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2141 : InitializedEntity::InitializeMember(IndirectMember, 0); 2142 InitializationKind Kind = 2143 InitList ? InitializationKind::CreateDirectList(IdLoc) 2144 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2145 InitRange.getEnd()); 2146 2147 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 2148 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, 2149 MultiExprArg(*this, Args, NumArgs), 2150 0); 2151 if (MemberInit.isInvalid()) 2152 return true; 2153 2154 CheckImplicitConversions(MemberInit.get(), 2155 InitRange.getBegin()); 2156 2157 // C++0x [class.base.init]p7: 2158 // The initialization of each base and member constitutes a 2159 // full-expression. 2160 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2161 if (MemberInit.isInvalid()) 2162 return true; 2163 2164 // If we are in a dependent context, template instantiation will 2165 // perform this type-checking again. Just save the arguments that we 2166 // received. 2167 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2168 // of the information that we have about the member 2169 // initializer. However, deconstructing the ASTs is a dicey process, 2170 // and this approach is far more likely to get the corner cases right. 2171 if (CurContext->isDependentContext()) { 2172 // The existing Init will do fine. 2173 } else { 2174 Init = MemberInit.get(); 2175 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2176 } 2177 } 2178 2179 if (DirectMember) { 2180 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2181 InitRange.getBegin(), Init, 2182 InitRange.getEnd()); 2183 } else { 2184 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2185 InitRange.getBegin(), Init, 2186 InitRange.getEnd()); 2187 } 2188} 2189 2190MemInitResult 2191Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2192 CXXRecordDecl *ClassDecl) { 2193 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2194 if (!LangOpts.CPlusPlus0x) 2195 return Diag(NameLoc, diag::err_delegating_ctor) 2196 << TInfo->getTypeLoc().getLocalSourceRange(); 2197 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2198 2199 bool InitList = true; 2200 Expr **Args = &Init; 2201 unsigned NumArgs = 1; 2202 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2203 InitList = false; 2204 Args = ParenList->getExprs(); 2205 NumArgs = ParenList->getNumExprs(); 2206 } 2207 2208 SourceRange InitRange = Init->getSourceRange(); 2209 // Initialize the object. 2210 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2211 QualType(ClassDecl->getTypeForDecl(), 0)); 2212 InitializationKind Kind = 2213 InitList ? InitializationKind::CreateDirectList(NameLoc) 2214 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2215 InitRange.getEnd()); 2216 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 2217 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2218 MultiExprArg(*this, Args,NumArgs), 2219 0); 2220 if (DelegationInit.isInvalid()) 2221 return true; 2222 2223 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2224 "Delegating constructor with no target?"); 2225 2226 CheckImplicitConversions(DelegationInit.get(), InitRange.getBegin()); 2227 2228 // C++0x [class.base.init]p7: 2229 // The initialization of each base and member constitutes a 2230 // full-expression. 2231 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2232 if (DelegationInit.isInvalid()) 2233 return true; 2234 2235 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2236 DelegationInit.takeAs<Expr>(), 2237 InitRange.getEnd()); 2238} 2239 2240MemInitResult 2241Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2242 Expr *Init, CXXRecordDecl *ClassDecl, 2243 SourceLocation EllipsisLoc) { 2244 SourceLocation BaseLoc 2245 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2246 2247 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2248 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2249 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2250 2251 // C++ [class.base.init]p2: 2252 // [...] Unless the mem-initializer-id names a nonstatic data 2253 // member of the constructor's class or a direct or virtual base 2254 // of that class, the mem-initializer is ill-formed. A 2255 // mem-initializer-list can initialize a base class using any 2256 // name that denotes that base class type. 2257 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2258 2259 SourceRange InitRange = Init->getSourceRange(); 2260 if (EllipsisLoc.isValid()) { 2261 // This is a pack expansion. 2262 if (!BaseType->containsUnexpandedParameterPack()) { 2263 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2264 << SourceRange(BaseLoc, InitRange.getEnd()); 2265 2266 EllipsisLoc = SourceLocation(); 2267 } 2268 } else { 2269 // Check for any unexpanded parameter packs. 2270 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2271 return true; 2272 2273 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2274 return true; 2275 } 2276 2277 // Check for direct and virtual base classes. 2278 const CXXBaseSpecifier *DirectBaseSpec = 0; 2279 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2280 if (!Dependent) { 2281 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2282 BaseType)) 2283 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2284 2285 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2286 VirtualBaseSpec); 2287 2288 // C++ [base.class.init]p2: 2289 // Unless the mem-initializer-id names a nonstatic data member of the 2290 // constructor's class or a direct or virtual base of that class, the 2291 // mem-initializer is ill-formed. 2292 if (!DirectBaseSpec && !VirtualBaseSpec) { 2293 // If the class has any dependent bases, then it's possible that 2294 // one of those types will resolve to the same type as 2295 // BaseType. Therefore, just treat this as a dependent base 2296 // class initialization. FIXME: Should we try to check the 2297 // initialization anyway? It seems odd. 2298 if (ClassDecl->hasAnyDependentBases()) 2299 Dependent = true; 2300 else 2301 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2302 << BaseType << Context.getTypeDeclType(ClassDecl) 2303 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2304 } 2305 } 2306 2307 if (Dependent) { 2308 DiscardCleanupsInEvaluationContext(); 2309 2310 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2311 /*IsVirtual=*/false, 2312 InitRange.getBegin(), Init, 2313 InitRange.getEnd(), EllipsisLoc); 2314 } 2315 2316 // C++ [base.class.init]p2: 2317 // If a mem-initializer-id is ambiguous because it designates both 2318 // a direct non-virtual base class and an inherited virtual base 2319 // class, the mem-initializer is ill-formed. 2320 if (DirectBaseSpec && VirtualBaseSpec) 2321 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2322 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2323 2324 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2325 if (!BaseSpec) 2326 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2327 2328 // Initialize the base. 2329 bool InitList = true; 2330 Expr **Args = &Init; 2331 unsigned NumArgs = 1; 2332 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2333 InitList = false; 2334 Args = ParenList->getExprs(); 2335 NumArgs = ParenList->getNumExprs(); 2336 } 2337 2338 InitializedEntity BaseEntity = 2339 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2340 InitializationKind Kind = 2341 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2342 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2343 InitRange.getEnd()); 2344 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 2345 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, 2346 MultiExprArg(*this, Args, NumArgs), 2347 0); 2348 if (BaseInit.isInvalid()) 2349 return true; 2350 2351 CheckImplicitConversions(BaseInit.get(), InitRange.getBegin()); 2352 2353 // C++0x [class.base.init]p7: 2354 // The initialization of each base and member constitutes a 2355 // full-expression. 2356 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2357 if (BaseInit.isInvalid()) 2358 return true; 2359 2360 // If we are in a dependent context, template instantiation will 2361 // perform this type-checking again. Just save the arguments that we 2362 // received in a ParenListExpr. 2363 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2364 // of the information that we have about the base 2365 // initializer. However, deconstructing the ASTs is a dicey process, 2366 // and this approach is far more likely to get the corner cases right. 2367 if (CurContext->isDependentContext()) 2368 BaseInit = Owned(Init); 2369 2370 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2371 BaseSpec->isVirtual(), 2372 InitRange.getBegin(), 2373 BaseInit.takeAs<Expr>(), 2374 InitRange.getEnd(), EllipsisLoc); 2375} 2376 2377// Create a static_cast\<T&&>(expr). 2378static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2379 QualType ExprType = E->getType(); 2380 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2381 SourceLocation ExprLoc = E->getLocStart(); 2382 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2383 TargetType, ExprLoc); 2384 2385 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2386 SourceRange(ExprLoc, ExprLoc), 2387 E->getSourceRange()).take(); 2388} 2389 2390/// ImplicitInitializerKind - How an implicit base or member initializer should 2391/// initialize its base or member. 2392enum ImplicitInitializerKind { 2393 IIK_Default, 2394 IIK_Copy, 2395 IIK_Move 2396}; 2397 2398static bool 2399BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2400 ImplicitInitializerKind ImplicitInitKind, 2401 CXXBaseSpecifier *BaseSpec, 2402 bool IsInheritedVirtualBase, 2403 CXXCtorInitializer *&CXXBaseInit) { 2404 InitializedEntity InitEntity 2405 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2406 IsInheritedVirtualBase); 2407 2408 ExprResult BaseInit; 2409 2410 switch (ImplicitInitKind) { 2411 case IIK_Default: { 2412 InitializationKind InitKind 2413 = InitializationKind::CreateDefault(Constructor->getLocation()); 2414 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2415 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2416 MultiExprArg(SemaRef, 0, 0)); 2417 break; 2418 } 2419 2420 case IIK_Move: 2421 case IIK_Copy: { 2422 bool Moving = ImplicitInitKind == IIK_Move; 2423 ParmVarDecl *Param = Constructor->getParamDecl(0); 2424 QualType ParamType = Param->getType().getNonReferenceType(); 2425 2426 Expr *CopyCtorArg = 2427 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2428 SourceLocation(), Param, false, 2429 Constructor->getLocation(), ParamType, 2430 VK_LValue, 0); 2431 2432 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2433 2434 // Cast to the base class to avoid ambiguities. 2435 QualType ArgTy = 2436 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2437 ParamType.getQualifiers()); 2438 2439 if (Moving) { 2440 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2441 } 2442 2443 CXXCastPath BasePath; 2444 BasePath.push_back(BaseSpec); 2445 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2446 CK_UncheckedDerivedToBase, 2447 Moving ? VK_XValue : VK_LValue, 2448 &BasePath).take(); 2449 2450 InitializationKind InitKind 2451 = InitializationKind::CreateDirect(Constructor->getLocation(), 2452 SourceLocation(), SourceLocation()); 2453 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2454 &CopyCtorArg, 1); 2455 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2456 MultiExprArg(&CopyCtorArg, 1)); 2457 break; 2458 } 2459 } 2460 2461 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2462 if (BaseInit.isInvalid()) 2463 return true; 2464 2465 CXXBaseInit = 2466 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2467 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2468 SourceLocation()), 2469 BaseSpec->isVirtual(), 2470 SourceLocation(), 2471 BaseInit.takeAs<Expr>(), 2472 SourceLocation(), 2473 SourceLocation()); 2474 2475 return false; 2476} 2477 2478static bool RefersToRValueRef(Expr *MemRef) { 2479 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2480 return Referenced->getType()->isRValueReferenceType(); 2481} 2482 2483static bool 2484BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2485 ImplicitInitializerKind ImplicitInitKind, 2486 FieldDecl *Field, IndirectFieldDecl *Indirect, 2487 CXXCtorInitializer *&CXXMemberInit) { 2488 if (Field->isInvalidDecl()) 2489 return true; 2490 2491 SourceLocation Loc = Constructor->getLocation(); 2492 2493 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2494 bool Moving = ImplicitInitKind == IIK_Move; 2495 ParmVarDecl *Param = Constructor->getParamDecl(0); 2496 QualType ParamType = Param->getType().getNonReferenceType(); 2497 2498 // Suppress copying zero-width bitfields. 2499 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2500 return false; 2501 2502 Expr *MemberExprBase = 2503 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2504 SourceLocation(), Param, false, 2505 Loc, ParamType, VK_LValue, 0); 2506 2507 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2508 2509 if (Moving) { 2510 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2511 } 2512 2513 // Build a reference to this field within the parameter. 2514 CXXScopeSpec SS; 2515 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2516 Sema::LookupMemberName); 2517 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2518 : cast<ValueDecl>(Field), AS_public); 2519 MemberLookup.resolveKind(); 2520 ExprResult CtorArg 2521 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2522 ParamType, Loc, 2523 /*IsArrow=*/false, 2524 SS, 2525 /*TemplateKWLoc=*/SourceLocation(), 2526 /*FirstQualifierInScope=*/0, 2527 MemberLookup, 2528 /*TemplateArgs=*/0); 2529 if (CtorArg.isInvalid()) 2530 return true; 2531 2532 // C++11 [class.copy]p15: 2533 // - if a member m has rvalue reference type T&&, it is direct-initialized 2534 // with static_cast<T&&>(x.m); 2535 if (RefersToRValueRef(CtorArg.get())) { 2536 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2537 } 2538 2539 // When the field we are copying is an array, create index variables for 2540 // each dimension of the array. We use these index variables to subscript 2541 // the source array, and other clients (e.g., CodeGen) will perform the 2542 // necessary iteration with these index variables. 2543 SmallVector<VarDecl *, 4> IndexVariables; 2544 QualType BaseType = Field->getType(); 2545 QualType SizeType = SemaRef.Context.getSizeType(); 2546 bool InitializingArray = false; 2547 while (const ConstantArrayType *Array 2548 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2549 InitializingArray = true; 2550 // Create the iteration variable for this array index. 2551 IdentifierInfo *IterationVarName = 0; 2552 { 2553 SmallString<8> Str; 2554 llvm::raw_svector_ostream OS(Str); 2555 OS << "__i" << IndexVariables.size(); 2556 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2557 } 2558 VarDecl *IterationVar 2559 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2560 IterationVarName, SizeType, 2561 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2562 SC_None, SC_None); 2563 IndexVariables.push_back(IterationVar); 2564 2565 // Create a reference to the iteration variable. 2566 ExprResult IterationVarRef 2567 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2568 assert(!IterationVarRef.isInvalid() && 2569 "Reference to invented variable cannot fail!"); 2570 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2571 assert(!IterationVarRef.isInvalid() && 2572 "Conversion of invented variable cannot fail!"); 2573 2574 // Subscript the array with this iteration variable. 2575 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2576 IterationVarRef.take(), 2577 Loc); 2578 if (CtorArg.isInvalid()) 2579 return true; 2580 2581 BaseType = Array->getElementType(); 2582 } 2583 2584 // The array subscript expression is an lvalue, which is wrong for moving. 2585 if (Moving && InitializingArray) 2586 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2587 2588 // Construct the entity that we will be initializing. For an array, this 2589 // will be first element in the array, which may require several levels 2590 // of array-subscript entities. 2591 SmallVector<InitializedEntity, 4> Entities; 2592 Entities.reserve(1 + IndexVariables.size()); 2593 if (Indirect) 2594 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2595 else 2596 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2597 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2598 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2599 0, 2600 Entities.back())); 2601 2602 // Direct-initialize to use the copy constructor. 2603 InitializationKind InitKind = 2604 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2605 2606 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2607 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2608 &CtorArgE, 1); 2609 2610 ExprResult MemberInit 2611 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2612 MultiExprArg(&CtorArgE, 1)); 2613 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2614 if (MemberInit.isInvalid()) 2615 return true; 2616 2617 if (Indirect) { 2618 assert(IndexVariables.size() == 0 && 2619 "Indirect field improperly initialized"); 2620 CXXMemberInit 2621 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2622 Loc, Loc, 2623 MemberInit.takeAs<Expr>(), 2624 Loc); 2625 } else 2626 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2627 Loc, MemberInit.takeAs<Expr>(), 2628 Loc, 2629 IndexVariables.data(), 2630 IndexVariables.size()); 2631 return false; 2632 } 2633 2634 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2635 2636 QualType FieldBaseElementType = 2637 SemaRef.Context.getBaseElementType(Field->getType()); 2638 2639 if (FieldBaseElementType->isRecordType()) { 2640 InitializedEntity InitEntity 2641 = Indirect? InitializedEntity::InitializeMember(Indirect) 2642 : InitializedEntity::InitializeMember(Field); 2643 InitializationKind InitKind = 2644 InitializationKind::CreateDefault(Loc); 2645 2646 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2647 ExprResult MemberInit = 2648 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2649 2650 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2651 if (MemberInit.isInvalid()) 2652 return true; 2653 2654 if (Indirect) 2655 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2656 Indirect, Loc, 2657 Loc, 2658 MemberInit.get(), 2659 Loc); 2660 else 2661 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2662 Field, Loc, Loc, 2663 MemberInit.get(), 2664 Loc); 2665 return false; 2666 } 2667 2668 if (!Field->getParent()->isUnion()) { 2669 if (FieldBaseElementType->isReferenceType()) { 2670 SemaRef.Diag(Constructor->getLocation(), 2671 diag::err_uninitialized_member_in_ctor) 2672 << (int)Constructor->isImplicit() 2673 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2674 << 0 << Field->getDeclName(); 2675 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2676 return true; 2677 } 2678 2679 if (FieldBaseElementType.isConstQualified()) { 2680 SemaRef.Diag(Constructor->getLocation(), 2681 diag::err_uninitialized_member_in_ctor) 2682 << (int)Constructor->isImplicit() 2683 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2684 << 1 << Field->getDeclName(); 2685 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2686 return true; 2687 } 2688 } 2689 2690 if (SemaRef.getLangOpts().ObjCAutoRefCount && 2691 FieldBaseElementType->isObjCRetainableType() && 2692 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2693 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2694 // Instant objects: 2695 // Default-initialize Objective-C pointers to NULL. 2696 CXXMemberInit 2697 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2698 Loc, Loc, 2699 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2700 Loc); 2701 return false; 2702 } 2703 2704 // Nothing to initialize. 2705 CXXMemberInit = 0; 2706 return false; 2707} 2708 2709namespace { 2710struct BaseAndFieldInfo { 2711 Sema &S; 2712 CXXConstructorDecl *Ctor; 2713 bool AnyErrorsInInits; 2714 ImplicitInitializerKind IIK; 2715 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2716 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2717 2718 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2719 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2720 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2721 if (Generated && Ctor->isCopyConstructor()) 2722 IIK = IIK_Copy; 2723 else if (Generated && Ctor->isMoveConstructor()) 2724 IIK = IIK_Move; 2725 else 2726 IIK = IIK_Default; 2727 } 2728 2729 bool isImplicitCopyOrMove() const { 2730 switch (IIK) { 2731 case IIK_Copy: 2732 case IIK_Move: 2733 return true; 2734 2735 case IIK_Default: 2736 return false; 2737 } 2738 2739 llvm_unreachable("Invalid ImplicitInitializerKind!"); 2740 } 2741}; 2742} 2743 2744/// \brief Determine whether the given indirect field declaration is somewhere 2745/// within an anonymous union. 2746static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2747 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2748 CEnd = F->chain_end(); 2749 C != CEnd; ++C) 2750 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2751 if (Record->isUnion()) 2752 return true; 2753 2754 return false; 2755} 2756 2757/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2758/// array type. 2759static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2760 if (T->isIncompleteArrayType()) 2761 return true; 2762 2763 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2764 if (!ArrayT->getSize()) 2765 return true; 2766 2767 T = ArrayT->getElementType(); 2768 } 2769 2770 return false; 2771} 2772 2773static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2774 FieldDecl *Field, 2775 IndirectFieldDecl *Indirect = 0) { 2776 2777 // Overwhelmingly common case: we have a direct initializer for this field. 2778 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2779 Info.AllToInit.push_back(Init); 2780 return false; 2781 } 2782 2783 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2784 // has a brace-or-equal-initializer, the entity is initialized as specified 2785 // in [dcl.init]. 2786 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 2787 CXXCtorInitializer *Init; 2788 if (Indirect) 2789 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2790 SourceLocation(), 2791 SourceLocation(), 0, 2792 SourceLocation()); 2793 else 2794 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2795 SourceLocation(), 2796 SourceLocation(), 0, 2797 SourceLocation()); 2798 Info.AllToInit.push_back(Init); 2799 return false; 2800 } 2801 2802 // Don't build an implicit initializer for union members if none was 2803 // explicitly specified. 2804 if (Field->getParent()->isUnion() || 2805 (Indirect && isWithinAnonymousUnion(Indirect))) 2806 return false; 2807 2808 // Don't initialize incomplete or zero-length arrays. 2809 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 2810 return false; 2811 2812 // Don't try to build an implicit initializer if there were semantic 2813 // errors in any of the initializers (and therefore we might be 2814 // missing some that the user actually wrote). 2815 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2816 return false; 2817 2818 CXXCtorInitializer *Init = 0; 2819 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2820 Indirect, Init)) 2821 return true; 2822 2823 if (Init) 2824 Info.AllToInit.push_back(Init); 2825 2826 return false; 2827} 2828 2829bool 2830Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2831 CXXCtorInitializer *Initializer) { 2832 assert(Initializer->isDelegatingInitializer()); 2833 Constructor->setNumCtorInitializers(1); 2834 CXXCtorInitializer **initializer = 2835 new (Context) CXXCtorInitializer*[1]; 2836 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2837 Constructor->setCtorInitializers(initializer); 2838 2839 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2840 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 2841 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2842 } 2843 2844 DelegatingCtorDecls.push_back(Constructor); 2845 2846 return false; 2847} 2848 2849bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2850 CXXCtorInitializer **Initializers, 2851 unsigned NumInitializers, 2852 bool AnyErrors) { 2853 if (Constructor->isDependentContext()) { 2854 // Just store the initializers as written, they will be checked during 2855 // instantiation. 2856 if (NumInitializers > 0) { 2857 Constructor->setNumCtorInitializers(NumInitializers); 2858 CXXCtorInitializer **baseOrMemberInitializers = 2859 new (Context) CXXCtorInitializer*[NumInitializers]; 2860 memcpy(baseOrMemberInitializers, Initializers, 2861 NumInitializers * sizeof(CXXCtorInitializer*)); 2862 Constructor->setCtorInitializers(baseOrMemberInitializers); 2863 } 2864 2865 return false; 2866 } 2867 2868 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2869 2870 // We need to build the initializer AST according to order of construction 2871 // and not what user specified in the Initializers list. 2872 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2873 if (!ClassDecl) 2874 return true; 2875 2876 bool HadError = false; 2877 2878 for (unsigned i = 0; i < NumInitializers; i++) { 2879 CXXCtorInitializer *Member = Initializers[i]; 2880 2881 if (Member->isBaseInitializer()) 2882 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2883 else 2884 Info.AllBaseFields[Member->getAnyMember()] = Member; 2885 } 2886 2887 // Keep track of the direct virtual bases. 2888 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2889 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2890 E = ClassDecl->bases_end(); I != E; ++I) { 2891 if (I->isVirtual()) 2892 DirectVBases.insert(I); 2893 } 2894 2895 // Push virtual bases before others. 2896 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2897 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2898 2899 if (CXXCtorInitializer *Value 2900 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2901 Info.AllToInit.push_back(Value); 2902 } else if (!AnyErrors) { 2903 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2904 CXXCtorInitializer *CXXBaseInit; 2905 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2906 VBase, IsInheritedVirtualBase, 2907 CXXBaseInit)) { 2908 HadError = true; 2909 continue; 2910 } 2911 2912 Info.AllToInit.push_back(CXXBaseInit); 2913 } 2914 } 2915 2916 // Non-virtual bases. 2917 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2918 E = ClassDecl->bases_end(); Base != E; ++Base) { 2919 // Virtuals are in the virtual base list and already constructed. 2920 if (Base->isVirtual()) 2921 continue; 2922 2923 if (CXXCtorInitializer *Value 2924 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2925 Info.AllToInit.push_back(Value); 2926 } else if (!AnyErrors) { 2927 CXXCtorInitializer *CXXBaseInit; 2928 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2929 Base, /*IsInheritedVirtualBase=*/false, 2930 CXXBaseInit)) { 2931 HadError = true; 2932 continue; 2933 } 2934 2935 Info.AllToInit.push_back(CXXBaseInit); 2936 } 2937 } 2938 2939 // Fields. 2940 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 2941 MemEnd = ClassDecl->decls_end(); 2942 Mem != MemEnd; ++Mem) { 2943 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 2944 // C++ [class.bit]p2: 2945 // A declaration for a bit-field that omits the identifier declares an 2946 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 2947 // initialized. 2948 if (F->isUnnamedBitfield()) 2949 continue; 2950 2951 // If we're not generating the implicit copy/move constructor, then we'll 2952 // handle anonymous struct/union fields based on their individual 2953 // indirect fields. 2954 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 2955 continue; 2956 2957 if (CollectFieldInitializer(*this, Info, F)) 2958 HadError = true; 2959 continue; 2960 } 2961 2962 // Beyond this point, we only consider default initialization. 2963 if (Info.IIK != IIK_Default) 2964 continue; 2965 2966 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 2967 if (F->getType()->isIncompleteArrayType()) { 2968 assert(ClassDecl->hasFlexibleArrayMember() && 2969 "Incomplete array type is not valid"); 2970 continue; 2971 } 2972 2973 // Initialize each field of an anonymous struct individually. 2974 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 2975 HadError = true; 2976 2977 continue; 2978 } 2979 } 2980 2981 NumInitializers = Info.AllToInit.size(); 2982 if (NumInitializers > 0) { 2983 Constructor->setNumCtorInitializers(NumInitializers); 2984 CXXCtorInitializer **baseOrMemberInitializers = 2985 new (Context) CXXCtorInitializer*[NumInitializers]; 2986 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2987 NumInitializers * sizeof(CXXCtorInitializer*)); 2988 Constructor->setCtorInitializers(baseOrMemberInitializers); 2989 2990 // Constructors implicitly reference the base and member 2991 // destructors. 2992 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2993 Constructor->getParent()); 2994 } 2995 2996 return HadError; 2997} 2998 2999static void *GetKeyForTopLevelField(FieldDecl *Field) { 3000 // For anonymous unions, use the class declaration as the key. 3001 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 3002 if (RT->getDecl()->isAnonymousStructOrUnion()) 3003 return static_cast<void *>(RT->getDecl()); 3004 } 3005 return static_cast<void *>(Field); 3006} 3007 3008static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 3009 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 3010} 3011 3012static void *GetKeyForMember(ASTContext &Context, 3013 CXXCtorInitializer *Member) { 3014 if (!Member->isAnyMemberInitializer()) 3015 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3016 3017 // For fields injected into the class via declaration of an anonymous union, 3018 // use its anonymous union class declaration as the unique key. 3019 FieldDecl *Field = Member->getAnyMember(); 3020 3021 // If the field is a member of an anonymous struct or union, our key 3022 // is the anonymous record decl that's a direct child of the class. 3023 RecordDecl *RD = Field->getParent(); 3024 if (RD->isAnonymousStructOrUnion()) { 3025 while (true) { 3026 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 3027 if (Parent->isAnonymousStructOrUnion()) 3028 RD = Parent; 3029 else 3030 break; 3031 } 3032 3033 return static_cast<void *>(RD); 3034 } 3035 3036 return static_cast<void *>(Field); 3037} 3038 3039static void 3040DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 3041 const CXXConstructorDecl *Constructor, 3042 CXXCtorInitializer **Inits, 3043 unsigned NumInits) { 3044 if (Constructor->getDeclContext()->isDependentContext()) 3045 return; 3046 3047 // Don't check initializers order unless the warning is enabled at the 3048 // location of at least one initializer. 3049 bool ShouldCheckOrder = false; 3050 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3051 CXXCtorInitializer *Init = Inits[InitIndex]; 3052 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3053 Init->getSourceLocation()) 3054 != DiagnosticsEngine::Ignored) { 3055 ShouldCheckOrder = true; 3056 break; 3057 } 3058 } 3059 if (!ShouldCheckOrder) 3060 return; 3061 3062 // Build the list of bases and members in the order that they'll 3063 // actually be initialized. The explicit initializers should be in 3064 // this same order but may be missing things. 3065 SmallVector<const void*, 32> IdealInitKeys; 3066 3067 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3068 3069 // 1. Virtual bases. 3070 for (CXXRecordDecl::base_class_const_iterator VBase = 3071 ClassDecl->vbases_begin(), 3072 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3073 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3074 3075 // 2. Non-virtual bases. 3076 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3077 E = ClassDecl->bases_end(); Base != E; ++Base) { 3078 if (Base->isVirtual()) 3079 continue; 3080 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3081 } 3082 3083 // 3. Direct fields. 3084 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3085 E = ClassDecl->field_end(); Field != E; ++Field) { 3086 if (Field->isUnnamedBitfield()) 3087 continue; 3088 3089 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 3090 } 3091 3092 unsigned NumIdealInits = IdealInitKeys.size(); 3093 unsigned IdealIndex = 0; 3094 3095 CXXCtorInitializer *PrevInit = 0; 3096 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3097 CXXCtorInitializer *Init = Inits[InitIndex]; 3098 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3099 3100 // Scan forward to try to find this initializer in the idealized 3101 // initializers list. 3102 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3103 if (InitKey == IdealInitKeys[IdealIndex]) 3104 break; 3105 3106 // If we didn't find this initializer, it must be because we 3107 // scanned past it on a previous iteration. That can only 3108 // happen if we're out of order; emit a warning. 3109 if (IdealIndex == NumIdealInits && PrevInit) { 3110 Sema::SemaDiagnosticBuilder D = 3111 SemaRef.Diag(PrevInit->getSourceLocation(), 3112 diag::warn_initializer_out_of_order); 3113 3114 if (PrevInit->isAnyMemberInitializer()) 3115 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3116 else 3117 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3118 3119 if (Init->isAnyMemberInitializer()) 3120 D << 0 << Init->getAnyMember()->getDeclName(); 3121 else 3122 D << 1 << Init->getTypeSourceInfo()->getType(); 3123 3124 // Move back to the initializer's location in the ideal list. 3125 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3126 if (InitKey == IdealInitKeys[IdealIndex]) 3127 break; 3128 3129 assert(IdealIndex != NumIdealInits && 3130 "initializer not found in initializer list"); 3131 } 3132 3133 PrevInit = Init; 3134 } 3135} 3136 3137namespace { 3138bool CheckRedundantInit(Sema &S, 3139 CXXCtorInitializer *Init, 3140 CXXCtorInitializer *&PrevInit) { 3141 if (!PrevInit) { 3142 PrevInit = Init; 3143 return false; 3144 } 3145 3146 if (FieldDecl *Field = Init->getMember()) 3147 S.Diag(Init->getSourceLocation(), 3148 diag::err_multiple_mem_initialization) 3149 << Field->getDeclName() 3150 << Init->getSourceRange(); 3151 else { 3152 const Type *BaseClass = Init->getBaseClass(); 3153 assert(BaseClass && "neither field nor base"); 3154 S.Diag(Init->getSourceLocation(), 3155 diag::err_multiple_base_initialization) 3156 << QualType(BaseClass, 0) 3157 << Init->getSourceRange(); 3158 } 3159 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3160 << 0 << PrevInit->getSourceRange(); 3161 3162 return true; 3163} 3164 3165typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3166typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3167 3168bool CheckRedundantUnionInit(Sema &S, 3169 CXXCtorInitializer *Init, 3170 RedundantUnionMap &Unions) { 3171 FieldDecl *Field = Init->getAnyMember(); 3172 RecordDecl *Parent = Field->getParent(); 3173 NamedDecl *Child = Field; 3174 3175 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3176 if (Parent->isUnion()) { 3177 UnionEntry &En = Unions[Parent]; 3178 if (En.first && En.first != Child) { 3179 S.Diag(Init->getSourceLocation(), 3180 diag::err_multiple_mem_union_initialization) 3181 << Field->getDeclName() 3182 << Init->getSourceRange(); 3183 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3184 << 0 << En.second->getSourceRange(); 3185 return true; 3186 } 3187 if (!En.first) { 3188 En.first = Child; 3189 En.second = Init; 3190 } 3191 if (!Parent->isAnonymousStructOrUnion()) 3192 return false; 3193 } 3194 3195 Child = Parent; 3196 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3197 } 3198 3199 return false; 3200} 3201} 3202 3203/// ActOnMemInitializers - Handle the member initializers for a constructor. 3204void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3205 SourceLocation ColonLoc, 3206 CXXCtorInitializer **meminits, 3207 unsigned NumMemInits, 3208 bool AnyErrors) { 3209 if (!ConstructorDecl) 3210 return; 3211 3212 AdjustDeclIfTemplate(ConstructorDecl); 3213 3214 CXXConstructorDecl *Constructor 3215 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3216 3217 if (!Constructor) { 3218 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3219 return; 3220 } 3221 3222 CXXCtorInitializer **MemInits = 3223 reinterpret_cast<CXXCtorInitializer **>(meminits); 3224 3225 // Mapping for the duplicate initializers check. 3226 // For member initializers, this is keyed with a FieldDecl*. 3227 // For base initializers, this is keyed with a Type*. 3228 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3229 3230 // Mapping for the inconsistent anonymous-union initializers check. 3231 RedundantUnionMap MemberUnions; 3232 3233 bool HadError = false; 3234 for (unsigned i = 0; i < NumMemInits; i++) { 3235 CXXCtorInitializer *Init = MemInits[i]; 3236 3237 // Set the source order index. 3238 Init->setSourceOrder(i); 3239 3240 if (Init->isAnyMemberInitializer()) { 3241 FieldDecl *Field = Init->getAnyMember(); 3242 if (CheckRedundantInit(*this, Init, Members[Field]) || 3243 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3244 HadError = true; 3245 } else if (Init->isBaseInitializer()) { 3246 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3247 if (CheckRedundantInit(*this, Init, Members[Key])) 3248 HadError = true; 3249 } else { 3250 assert(Init->isDelegatingInitializer()); 3251 // This must be the only initializer 3252 if (i != 0 || NumMemInits > 1) { 3253 Diag(MemInits[0]->getSourceLocation(), 3254 diag::err_delegating_initializer_alone) 3255 << MemInits[0]->getSourceRange(); 3256 HadError = true; 3257 // We will treat this as being the only initializer. 3258 } 3259 SetDelegatingInitializer(Constructor, MemInits[i]); 3260 // Return immediately as the initializer is set. 3261 return; 3262 } 3263 } 3264 3265 if (HadError) 3266 return; 3267 3268 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3269 3270 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3271} 3272 3273void 3274Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3275 CXXRecordDecl *ClassDecl) { 3276 // Ignore dependent contexts. Also ignore unions, since their members never 3277 // have destructors implicitly called. 3278 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3279 return; 3280 3281 // FIXME: all the access-control diagnostics are positioned on the 3282 // field/base declaration. That's probably good; that said, the 3283 // user might reasonably want to know why the destructor is being 3284 // emitted, and we currently don't say. 3285 3286 // Non-static data members. 3287 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3288 E = ClassDecl->field_end(); I != E; ++I) { 3289 FieldDecl *Field = *I; 3290 if (Field->isInvalidDecl()) 3291 continue; 3292 3293 // Don't destroy incomplete or zero-length arrays. 3294 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3295 continue; 3296 3297 QualType FieldType = Context.getBaseElementType(Field->getType()); 3298 3299 const RecordType* RT = FieldType->getAs<RecordType>(); 3300 if (!RT) 3301 continue; 3302 3303 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3304 if (FieldClassDecl->isInvalidDecl()) 3305 continue; 3306 if (FieldClassDecl->hasIrrelevantDestructor()) 3307 continue; 3308 // The destructor for an implicit anonymous union member is never invoked. 3309 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) 3310 continue; 3311 3312 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3313 assert(Dtor && "No dtor found for FieldClassDecl!"); 3314 CheckDestructorAccess(Field->getLocation(), Dtor, 3315 PDiag(diag::err_access_dtor_field) 3316 << Field->getDeclName() 3317 << FieldType); 3318 3319 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3320 DiagnoseUseOfDecl(Dtor, Location); 3321 } 3322 3323 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3324 3325 // Bases. 3326 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3327 E = ClassDecl->bases_end(); Base != E; ++Base) { 3328 // Bases are always records in a well-formed non-dependent class. 3329 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3330 3331 // Remember direct virtual bases. 3332 if (Base->isVirtual()) 3333 DirectVirtualBases.insert(RT); 3334 3335 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3336 // If our base class is invalid, we probably can't get its dtor anyway. 3337 if (BaseClassDecl->isInvalidDecl()) 3338 continue; 3339 if (BaseClassDecl->hasIrrelevantDestructor()) 3340 continue; 3341 3342 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3343 assert(Dtor && "No dtor found for BaseClassDecl!"); 3344 3345 // FIXME: caret should be on the start of the class name 3346 CheckDestructorAccess(Base->getLocStart(), Dtor, 3347 PDiag(diag::err_access_dtor_base) 3348 << Base->getType() 3349 << Base->getSourceRange()); 3350 3351 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3352 DiagnoseUseOfDecl(Dtor, Location); 3353 } 3354 3355 // Virtual bases. 3356 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3357 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3358 3359 // Bases are always records in a well-formed non-dependent class. 3360 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 3361 3362 // Ignore direct virtual bases. 3363 if (DirectVirtualBases.count(RT)) 3364 continue; 3365 3366 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3367 // If our base class is invalid, we probably can't get its dtor anyway. 3368 if (BaseClassDecl->isInvalidDecl()) 3369 continue; 3370 if (BaseClassDecl->hasIrrelevantDestructor()) 3371 continue; 3372 3373 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3374 assert(Dtor && "No dtor found for BaseClassDecl!"); 3375 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3376 PDiag(diag::err_access_dtor_vbase) 3377 << VBase->getType()); 3378 3379 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3380 DiagnoseUseOfDecl(Dtor, Location); 3381 } 3382} 3383 3384void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3385 if (!CDtorDecl) 3386 return; 3387 3388 if (CXXConstructorDecl *Constructor 3389 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3390 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3391} 3392 3393bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3394 unsigned DiagID, AbstractDiagSelID SelID) { 3395 if (SelID == -1) 3396 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 3397 else 3398 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 3399} 3400 3401bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3402 const PartialDiagnostic &PD) { 3403 if (!getLangOpts().CPlusPlus) 3404 return false; 3405 3406 if (const ArrayType *AT = Context.getAsArrayType(T)) 3407 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3408 3409 if (const PointerType *PT = T->getAs<PointerType>()) { 3410 // Find the innermost pointer type. 3411 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3412 PT = T; 3413 3414 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3415 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3416 } 3417 3418 const RecordType *RT = T->getAs<RecordType>(); 3419 if (!RT) 3420 return false; 3421 3422 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3423 3424 // We can't answer whether something is abstract until it has a 3425 // definition. If it's currently being defined, we'll walk back 3426 // over all the declarations when we have a full definition. 3427 const CXXRecordDecl *Def = RD->getDefinition(); 3428 if (!Def || Def->isBeingDefined()) 3429 return false; 3430 3431 if (!RD->isAbstract()) 3432 return false; 3433 3434 Diag(Loc, PD) << RD->getDeclName(); 3435 DiagnoseAbstractType(RD); 3436 3437 return true; 3438} 3439 3440void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3441 // Check if we've already emitted the list of pure virtual functions 3442 // for this class. 3443 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3444 return; 3445 3446 CXXFinalOverriderMap FinalOverriders; 3447 RD->getFinalOverriders(FinalOverriders); 3448 3449 // Keep a set of seen pure methods so we won't diagnose the same method 3450 // more than once. 3451 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3452 3453 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3454 MEnd = FinalOverriders.end(); 3455 M != MEnd; 3456 ++M) { 3457 for (OverridingMethods::iterator SO = M->second.begin(), 3458 SOEnd = M->second.end(); 3459 SO != SOEnd; ++SO) { 3460 // C++ [class.abstract]p4: 3461 // A class is abstract if it contains or inherits at least one 3462 // pure virtual function for which the final overrider is pure 3463 // virtual. 3464 3465 // 3466 if (SO->second.size() != 1) 3467 continue; 3468 3469 if (!SO->second.front().Method->isPure()) 3470 continue; 3471 3472 if (!SeenPureMethods.insert(SO->second.front().Method)) 3473 continue; 3474 3475 Diag(SO->second.front().Method->getLocation(), 3476 diag::note_pure_virtual_function) 3477 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3478 } 3479 } 3480 3481 if (!PureVirtualClassDiagSet) 3482 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3483 PureVirtualClassDiagSet->insert(RD); 3484} 3485 3486namespace { 3487struct AbstractUsageInfo { 3488 Sema &S; 3489 CXXRecordDecl *Record; 3490 CanQualType AbstractType; 3491 bool Invalid; 3492 3493 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3494 : S(S), Record(Record), 3495 AbstractType(S.Context.getCanonicalType( 3496 S.Context.getTypeDeclType(Record))), 3497 Invalid(false) {} 3498 3499 void DiagnoseAbstractType() { 3500 if (Invalid) return; 3501 S.DiagnoseAbstractType(Record); 3502 Invalid = true; 3503 } 3504 3505 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3506}; 3507 3508struct CheckAbstractUsage { 3509 AbstractUsageInfo &Info; 3510 const NamedDecl *Ctx; 3511 3512 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3513 : Info(Info), Ctx(Ctx) {} 3514 3515 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3516 switch (TL.getTypeLocClass()) { 3517#define ABSTRACT_TYPELOC(CLASS, PARENT) 3518#define TYPELOC(CLASS, PARENT) \ 3519 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3520#include "clang/AST/TypeLocNodes.def" 3521 } 3522 } 3523 3524 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3525 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3526 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3527 if (!TL.getArg(I)) 3528 continue; 3529 3530 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3531 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3532 } 3533 } 3534 3535 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3536 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3537 } 3538 3539 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3540 // Visit the type parameters from a permissive context. 3541 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3542 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3543 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3544 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3545 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3546 // TODO: other template argument types? 3547 } 3548 } 3549 3550 // Visit pointee types from a permissive context. 3551#define CheckPolymorphic(Type) \ 3552 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3553 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3554 } 3555 CheckPolymorphic(PointerTypeLoc) 3556 CheckPolymorphic(ReferenceTypeLoc) 3557 CheckPolymorphic(MemberPointerTypeLoc) 3558 CheckPolymorphic(BlockPointerTypeLoc) 3559 CheckPolymorphic(AtomicTypeLoc) 3560 3561 /// Handle all the types we haven't given a more specific 3562 /// implementation for above. 3563 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3564 // Every other kind of type that we haven't called out already 3565 // that has an inner type is either (1) sugar or (2) contains that 3566 // inner type in some way as a subobject. 3567 if (TypeLoc Next = TL.getNextTypeLoc()) 3568 return Visit(Next, Sel); 3569 3570 // If there's no inner type and we're in a permissive context, 3571 // don't diagnose. 3572 if (Sel == Sema::AbstractNone) return; 3573 3574 // Check whether the type matches the abstract type. 3575 QualType T = TL.getType(); 3576 if (T->isArrayType()) { 3577 Sel = Sema::AbstractArrayType; 3578 T = Info.S.Context.getBaseElementType(T); 3579 } 3580 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3581 if (CT != Info.AbstractType) return; 3582 3583 // It matched; do some magic. 3584 if (Sel == Sema::AbstractArrayType) { 3585 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3586 << T << TL.getSourceRange(); 3587 } else { 3588 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3589 << Sel << T << TL.getSourceRange(); 3590 } 3591 Info.DiagnoseAbstractType(); 3592 } 3593}; 3594 3595void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3596 Sema::AbstractDiagSelID Sel) { 3597 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3598} 3599 3600} 3601 3602/// Check for invalid uses of an abstract type in a method declaration. 3603static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3604 CXXMethodDecl *MD) { 3605 // No need to do the check on definitions, which require that 3606 // the return/param types be complete. 3607 if (MD->doesThisDeclarationHaveABody()) 3608 return; 3609 3610 // For safety's sake, just ignore it if we don't have type source 3611 // information. This should never happen for non-implicit methods, 3612 // but... 3613 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3614 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3615} 3616 3617/// Check for invalid uses of an abstract type within a class definition. 3618static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3619 CXXRecordDecl *RD) { 3620 for (CXXRecordDecl::decl_iterator 3621 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3622 Decl *D = *I; 3623 if (D->isImplicit()) continue; 3624 3625 // Methods and method templates. 3626 if (isa<CXXMethodDecl>(D)) { 3627 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3628 } else if (isa<FunctionTemplateDecl>(D)) { 3629 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3630 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3631 3632 // Fields and static variables. 3633 } else if (isa<FieldDecl>(D)) { 3634 FieldDecl *FD = cast<FieldDecl>(D); 3635 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3636 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3637 } else if (isa<VarDecl>(D)) { 3638 VarDecl *VD = cast<VarDecl>(D); 3639 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3640 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3641 3642 // Nested classes and class templates. 3643 } else if (isa<CXXRecordDecl>(D)) { 3644 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3645 } else if (isa<ClassTemplateDecl>(D)) { 3646 CheckAbstractClassUsage(Info, 3647 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3648 } 3649 } 3650} 3651 3652/// \brief Perform semantic checks on a class definition that has been 3653/// completing, introducing implicitly-declared members, checking for 3654/// abstract types, etc. 3655void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3656 if (!Record) 3657 return; 3658 3659 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3660 AbstractUsageInfo Info(*this, Record); 3661 CheckAbstractClassUsage(Info, Record); 3662 } 3663 3664 // If this is not an aggregate type and has no user-declared constructor, 3665 // complain about any non-static data members of reference or const scalar 3666 // type, since they will never get initializers. 3667 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3668 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 3669 !Record->isLambda()) { 3670 bool Complained = false; 3671 for (RecordDecl::field_iterator F = Record->field_begin(), 3672 FEnd = Record->field_end(); 3673 F != FEnd; ++F) { 3674 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3675 continue; 3676 3677 if (F->getType()->isReferenceType() || 3678 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3679 if (!Complained) { 3680 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3681 << Record->getTagKind() << Record; 3682 Complained = true; 3683 } 3684 3685 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3686 << F->getType()->isReferenceType() 3687 << F->getDeclName(); 3688 } 3689 } 3690 } 3691 3692 if (Record->isDynamicClass() && !Record->isDependentType()) 3693 DynamicClasses.push_back(Record); 3694 3695 if (Record->getIdentifier()) { 3696 // C++ [class.mem]p13: 3697 // If T is the name of a class, then each of the following shall have a 3698 // name different from T: 3699 // - every member of every anonymous union that is a member of class T. 3700 // 3701 // C++ [class.mem]p14: 3702 // In addition, if class T has a user-declared constructor (12.1), every 3703 // non-static data member of class T shall have a name different from T. 3704 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3705 R.first != R.second; ++R.first) { 3706 NamedDecl *D = *R.first; 3707 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3708 isa<IndirectFieldDecl>(D)) { 3709 Diag(D->getLocation(), diag::err_member_name_of_class) 3710 << D->getDeclName(); 3711 break; 3712 } 3713 } 3714 } 3715 3716 // Warn if the class has virtual methods but non-virtual public destructor. 3717 if (Record->isPolymorphic() && !Record->isDependentType()) { 3718 CXXDestructorDecl *dtor = Record->getDestructor(); 3719 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3720 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3721 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3722 } 3723 3724 // See if a method overloads virtual methods in a base 3725 /// class without overriding any. 3726 if (!Record->isDependentType()) { 3727 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3728 MEnd = Record->method_end(); 3729 M != MEnd; ++M) { 3730 if (!(*M)->isStatic()) 3731 DiagnoseHiddenVirtualMethods(Record, *M); 3732 } 3733 } 3734 3735 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3736 // function that is not a constructor declares that member function to be 3737 // const. [...] The class of which that function is a member shall be 3738 // a literal type. 3739 // 3740 // If the class has virtual bases, any constexpr members will already have 3741 // been diagnosed by the checks performed on the member declaration, so 3742 // suppress this (less useful) diagnostic. 3743 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3744 !Record->isLiteral() && !Record->getNumVBases()) { 3745 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3746 MEnd = Record->method_end(); 3747 M != MEnd; ++M) { 3748 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 3749 switch (Record->getTemplateSpecializationKind()) { 3750 case TSK_ImplicitInstantiation: 3751 case TSK_ExplicitInstantiationDeclaration: 3752 case TSK_ExplicitInstantiationDefinition: 3753 // If a template instantiates to a non-literal type, but its members 3754 // instantiate to constexpr functions, the template is technically 3755 // ill-formed, but we allow it for sanity. 3756 continue; 3757 3758 case TSK_Undeclared: 3759 case TSK_ExplicitSpecialization: 3760 RequireLiteralType((*M)->getLocation(), Context.getRecordType(Record), 3761 PDiag(diag::err_constexpr_method_non_literal)); 3762 break; 3763 } 3764 3765 // Only produce one error per class. 3766 break; 3767 } 3768 } 3769 } 3770 3771 // Declare inherited constructors. We do this eagerly here because: 3772 // - The standard requires an eager diagnostic for conflicting inherited 3773 // constructors from different classes. 3774 // - The lazy declaration of the other implicit constructors is so as to not 3775 // waste space and performance on classes that are not meant to be 3776 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3777 // have inherited constructors. 3778 DeclareInheritedConstructors(Record); 3779 3780 if (!Record->isDependentType()) 3781 CheckExplicitlyDefaultedMethods(Record); 3782} 3783 3784void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3785 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3786 ME = Record->method_end(); 3787 MI != ME; ++MI) { 3788 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3789 switch (getSpecialMember(*MI)) { 3790 case CXXDefaultConstructor: 3791 CheckExplicitlyDefaultedDefaultConstructor( 3792 cast<CXXConstructorDecl>(*MI)); 3793 break; 3794 3795 case CXXDestructor: 3796 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3797 break; 3798 3799 case CXXCopyConstructor: 3800 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3801 break; 3802 3803 case CXXCopyAssignment: 3804 CheckExplicitlyDefaultedCopyAssignment(*MI); 3805 break; 3806 3807 case CXXMoveConstructor: 3808 CheckExplicitlyDefaultedMoveConstructor(cast<CXXConstructorDecl>(*MI)); 3809 break; 3810 3811 case CXXMoveAssignment: 3812 CheckExplicitlyDefaultedMoveAssignment(*MI); 3813 break; 3814 3815 case CXXInvalid: 3816 llvm_unreachable("non-special member explicitly defaulted!"); 3817 } 3818 } 3819 } 3820 3821} 3822 3823void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3824 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3825 3826 // Whether this was the first-declared instance of the constructor. 3827 // This affects whether we implicitly add an exception spec (and, eventually, 3828 // constexpr). It is also ill-formed to explicitly default a constructor such 3829 // that it would be deleted. (C++0x [decl.fct.def.default]) 3830 bool First = CD == CD->getCanonicalDecl(); 3831 3832 bool HadError = false; 3833 if (CD->getNumParams() != 0) { 3834 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3835 << CD->getSourceRange(); 3836 HadError = true; 3837 } 3838 3839 ImplicitExceptionSpecification Spec 3840 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3841 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3842 if (EPI.ExceptionSpecType == EST_Delayed) { 3843 // Exception specification depends on some deferred part of the class. We'll 3844 // try again when the class's definition has been fully processed. 3845 return; 3846 } 3847 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3848 *ExceptionType = Context.getFunctionType( 3849 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3850 3851 // C++11 [dcl.fct.def.default]p2: 3852 // An explicitly-defaulted function may be declared constexpr only if it 3853 // would have been implicitly declared as constexpr, 3854 // Do not apply this rule to templates, since core issue 1358 makes such 3855 // functions always instantiate to constexpr functions. 3856 if (CD->isConstexpr() && 3857 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 3858 if (!CD->getParent()->defaultedDefaultConstructorIsConstexpr()) { 3859 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3860 << CXXDefaultConstructor; 3861 HadError = true; 3862 } 3863 } 3864 // and may have an explicit exception-specification only if it is compatible 3865 // with the exception-specification on the implicit declaration. 3866 if (CtorType->hasExceptionSpec()) { 3867 if (CheckEquivalentExceptionSpec( 3868 PDiag(diag::err_incorrect_defaulted_exception_spec) 3869 << CXXDefaultConstructor, 3870 PDiag(), 3871 ExceptionType, SourceLocation(), 3872 CtorType, CD->getLocation())) { 3873 HadError = true; 3874 } 3875 } 3876 3877 // If a function is explicitly defaulted on its first declaration, 3878 if (First) { 3879 // -- it is implicitly considered to be constexpr if the implicit 3880 // definition would be, 3881 CD->setConstexpr(CD->getParent()->defaultedDefaultConstructorIsConstexpr()); 3882 3883 // -- it is implicitly considered to have the same 3884 // exception-specification as if it had been implicitly declared 3885 // 3886 // FIXME: a compatible, but different, explicit exception specification 3887 // will be silently overridden. We should issue a warning if this happens. 3888 EPI.ExtInfo = CtorType->getExtInfo(); 3889 3890 // Such a function is also trivial if the implicitly-declared function 3891 // would have been. 3892 CD->setTrivial(CD->getParent()->hasTrivialDefaultConstructor()); 3893 } 3894 3895 if (HadError) { 3896 CD->setInvalidDecl(); 3897 return; 3898 } 3899 3900 if (ShouldDeleteSpecialMember(CD, CXXDefaultConstructor)) { 3901 if (First) { 3902 CD->setDeletedAsWritten(); 3903 } else { 3904 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3905 << CXXDefaultConstructor; 3906 CD->setInvalidDecl(); 3907 } 3908 } 3909} 3910 3911void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3912 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3913 3914 // Whether this was the first-declared instance of the constructor. 3915 bool First = CD == CD->getCanonicalDecl(); 3916 3917 bool HadError = false; 3918 if (CD->getNumParams() != 1) { 3919 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3920 << CD->getSourceRange(); 3921 HadError = true; 3922 } 3923 3924 ImplicitExceptionSpecification Spec(Context); 3925 bool Const; 3926 llvm::tie(Spec, Const) = 3927 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3928 3929 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3930 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3931 *ExceptionType = Context.getFunctionType( 3932 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3933 3934 // Check for parameter type matching. 3935 // This is a copy ctor so we know it's a cv-qualified reference to T. 3936 QualType ArgType = CtorType->getArgType(0); 3937 if (ArgType->getPointeeType().isVolatileQualified()) { 3938 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3939 HadError = true; 3940 } 3941 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3942 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3943 HadError = true; 3944 } 3945 3946 // C++11 [dcl.fct.def.default]p2: 3947 // An explicitly-defaulted function may be declared constexpr only if it 3948 // would have been implicitly declared as constexpr, 3949 // Do not apply this rule to templates, since core issue 1358 makes such 3950 // functions always instantiate to constexpr functions. 3951 if (CD->isConstexpr() && 3952 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 3953 if (!CD->getParent()->defaultedCopyConstructorIsConstexpr()) { 3954 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3955 << CXXCopyConstructor; 3956 HadError = true; 3957 } 3958 } 3959 // and may have an explicit exception-specification only if it is compatible 3960 // with the exception-specification on the implicit declaration. 3961 if (CtorType->hasExceptionSpec()) { 3962 if (CheckEquivalentExceptionSpec( 3963 PDiag(diag::err_incorrect_defaulted_exception_spec) 3964 << CXXCopyConstructor, 3965 PDiag(), 3966 ExceptionType, SourceLocation(), 3967 CtorType, CD->getLocation())) { 3968 HadError = true; 3969 } 3970 } 3971 3972 // If a function is explicitly defaulted on its first declaration, 3973 if (First) { 3974 // -- it is implicitly considered to be constexpr if the implicit 3975 // definition would be, 3976 CD->setConstexpr(CD->getParent()->defaultedCopyConstructorIsConstexpr()); 3977 3978 // -- it is implicitly considered to have the same 3979 // exception-specification as if it had been implicitly declared, and 3980 // 3981 // FIXME: a compatible, but different, explicit exception specification 3982 // will be silently overridden. We should issue a warning if this happens. 3983 EPI.ExtInfo = CtorType->getExtInfo(); 3984 3985 // -- [...] it shall have the same parameter type as if it had been 3986 // implicitly declared. 3987 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3988 3989 // Such a function is also trivial if the implicitly-declared function 3990 // would have been. 3991 CD->setTrivial(CD->getParent()->hasTrivialCopyConstructor()); 3992 } 3993 3994 if (HadError) { 3995 CD->setInvalidDecl(); 3996 return; 3997 } 3998 3999 if (ShouldDeleteSpecialMember(CD, CXXCopyConstructor)) { 4000 if (First) { 4001 CD->setDeletedAsWritten(); 4002 } else { 4003 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 4004 << CXXCopyConstructor; 4005 CD->setInvalidDecl(); 4006 } 4007 } 4008} 4009 4010void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 4011 assert(MD->isExplicitlyDefaulted()); 4012 4013 // Whether this was the first-declared instance of the operator 4014 bool First = MD == MD->getCanonicalDecl(); 4015 4016 bool HadError = false; 4017 if (MD->getNumParams() != 1) { 4018 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 4019 << MD->getSourceRange(); 4020 HadError = true; 4021 } 4022 4023 QualType ReturnType = 4024 MD->getType()->getAs<FunctionType>()->getResultType(); 4025 if (!ReturnType->isLValueReferenceType() || 4026 !Context.hasSameType( 4027 Context.getCanonicalType(ReturnType->getPointeeType()), 4028 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 4029 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 4030 HadError = true; 4031 } 4032 4033 ImplicitExceptionSpecification Spec(Context); 4034 bool Const; 4035 llvm::tie(Spec, Const) = 4036 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 4037 4038 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4039 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4040 *ExceptionType = Context.getFunctionType( 4041 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4042 4043 QualType ArgType = OperType->getArgType(0); 4044 if (!ArgType->isLValueReferenceType()) { 4045 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4046 HadError = true; 4047 } else { 4048 if (ArgType->getPointeeType().isVolatileQualified()) { 4049 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 4050 HadError = true; 4051 } 4052 if (ArgType->getPointeeType().isConstQualified() && !Const) { 4053 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 4054 HadError = true; 4055 } 4056 } 4057 4058 if (OperType->getTypeQuals()) { 4059 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 4060 HadError = true; 4061 } 4062 4063 if (OperType->hasExceptionSpec()) { 4064 if (CheckEquivalentExceptionSpec( 4065 PDiag(diag::err_incorrect_defaulted_exception_spec) 4066 << CXXCopyAssignment, 4067 PDiag(), 4068 ExceptionType, SourceLocation(), 4069 OperType, MD->getLocation())) { 4070 HadError = true; 4071 } 4072 } 4073 if (First) { 4074 // We set the declaration to have the computed exception spec here. 4075 // We duplicate the one parameter type. 4076 EPI.RefQualifier = OperType->getRefQualifier(); 4077 EPI.ExtInfo = OperType->getExtInfo(); 4078 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4079 4080 // Such a function is also trivial if the implicitly-declared function 4081 // would have been. 4082 MD->setTrivial(MD->getParent()->hasTrivialCopyAssignment()); 4083 } 4084 4085 if (HadError) { 4086 MD->setInvalidDecl(); 4087 return; 4088 } 4089 4090 if (ShouldDeleteSpecialMember(MD, CXXCopyAssignment)) { 4091 if (First) { 4092 MD->setDeletedAsWritten(); 4093 } else { 4094 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4095 << CXXCopyAssignment; 4096 MD->setInvalidDecl(); 4097 } 4098 } 4099} 4100 4101void Sema::CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *CD) { 4102 assert(CD->isExplicitlyDefaulted() && CD->isMoveConstructor()); 4103 4104 // Whether this was the first-declared instance of the constructor. 4105 bool First = CD == CD->getCanonicalDecl(); 4106 4107 bool HadError = false; 4108 if (CD->getNumParams() != 1) { 4109 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_params) 4110 << CD->getSourceRange(); 4111 HadError = true; 4112 } 4113 4114 ImplicitExceptionSpecification Spec( 4115 ComputeDefaultedMoveCtorExceptionSpec(CD->getParent())); 4116 4117 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4118 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 4119 *ExceptionType = Context.getFunctionType( 4120 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4121 4122 // Check for parameter type matching. 4123 // This is a move ctor so we know it's a cv-qualified rvalue reference to T. 4124 QualType ArgType = CtorType->getArgType(0); 4125 if (ArgType->getPointeeType().isVolatileQualified()) { 4126 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_volatile_param); 4127 HadError = true; 4128 } 4129 if (ArgType->getPointeeType().isConstQualified()) { 4130 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_const_param); 4131 HadError = true; 4132 } 4133 4134 // C++11 [dcl.fct.def.default]p2: 4135 // An explicitly-defaulted function may be declared constexpr only if it 4136 // would have been implicitly declared as constexpr, 4137 // Do not apply this rule to templates, since core issue 1358 makes such 4138 // functions always instantiate to constexpr functions. 4139 if (CD->isConstexpr() && 4140 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4141 if (!CD->getParent()->defaultedMoveConstructorIsConstexpr()) { 4142 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 4143 << CXXMoveConstructor; 4144 HadError = true; 4145 } 4146 } 4147 // and may have an explicit exception-specification only if it is compatible 4148 // with the exception-specification on the implicit declaration. 4149 if (CtorType->hasExceptionSpec()) { 4150 if (CheckEquivalentExceptionSpec( 4151 PDiag(diag::err_incorrect_defaulted_exception_spec) 4152 << CXXMoveConstructor, 4153 PDiag(), 4154 ExceptionType, SourceLocation(), 4155 CtorType, CD->getLocation())) { 4156 HadError = true; 4157 } 4158 } 4159 4160 // If a function is explicitly defaulted on its first declaration, 4161 if (First) { 4162 // -- it is implicitly considered to be constexpr if the implicit 4163 // definition would be, 4164 CD->setConstexpr(CD->getParent()->defaultedMoveConstructorIsConstexpr()); 4165 4166 // -- it is implicitly considered to have the same 4167 // exception-specification as if it had been implicitly declared, and 4168 // 4169 // FIXME: a compatible, but different, explicit exception specification 4170 // will be silently overridden. We should issue a warning if this happens. 4171 EPI.ExtInfo = CtorType->getExtInfo(); 4172 4173 // -- [...] it shall have the same parameter type as if it had been 4174 // implicitly declared. 4175 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 4176 4177 // Such a function is also trivial if the implicitly-declared function 4178 // would have been. 4179 CD->setTrivial(CD->getParent()->hasTrivialMoveConstructor()); 4180 } 4181 4182 if (HadError) { 4183 CD->setInvalidDecl(); 4184 return; 4185 } 4186 4187 if (ShouldDeleteSpecialMember(CD, CXXMoveConstructor)) { 4188 if (First) { 4189 CD->setDeletedAsWritten(); 4190 } else { 4191 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 4192 << CXXMoveConstructor; 4193 CD->setInvalidDecl(); 4194 } 4195 } 4196} 4197 4198void Sema::CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *MD) { 4199 assert(MD->isExplicitlyDefaulted()); 4200 4201 // Whether this was the first-declared instance of the operator 4202 bool First = MD == MD->getCanonicalDecl(); 4203 4204 bool HadError = false; 4205 if (MD->getNumParams() != 1) { 4206 Diag(MD->getLocation(), diag::err_defaulted_move_assign_params) 4207 << MD->getSourceRange(); 4208 HadError = true; 4209 } 4210 4211 QualType ReturnType = 4212 MD->getType()->getAs<FunctionType>()->getResultType(); 4213 if (!ReturnType->isLValueReferenceType() || 4214 !Context.hasSameType( 4215 Context.getCanonicalType(ReturnType->getPointeeType()), 4216 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 4217 Diag(MD->getLocation(), diag::err_defaulted_move_assign_return_type); 4218 HadError = true; 4219 } 4220 4221 ImplicitExceptionSpecification Spec( 4222 ComputeDefaultedMoveCtorExceptionSpec(MD->getParent())); 4223 4224 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4225 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4226 *ExceptionType = Context.getFunctionType( 4227 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4228 4229 QualType ArgType = OperType->getArgType(0); 4230 if (!ArgType->isRValueReferenceType()) { 4231 Diag(MD->getLocation(), diag::err_defaulted_move_assign_not_ref); 4232 HadError = true; 4233 } else { 4234 if (ArgType->getPointeeType().isVolatileQualified()) { 4235 Diag(MD->getLocation(), diag::err_defaulted_move_assign_volatile_param); 4236 HadError = true; 4237 } 4238 if (ArgType->getPointeeType().isConstQualified()) { 4239 Diag(MD->getLocation(), diag::err_defaulted_move_assign_const_param); 4240 HadError = true; 4241 } 4242 } 4243 4244 if (OperType->getTypeQuals()) { 4245 Diag(MD->getLocation(), diag::err_defaulted_move_assign_quals); 4246 HadError = true; 4247 } 4248 4249 if (OperType->hasExceptionSpec()) { 4250 if (CheckEquivalentExceptionSpec( 4251 PDiag(diag::err_incorrect_defaulted_exception_spec) 4252 << CXXMoveAssignment, 4253 PDiag(), 4254 ExceptionType, SourceLocation(), 4255 OperType, MD->getLocation())) { 4256 HadError = true; 4257 } 4258 } 4259 if (First) { 4260 // We set the declaration to have the computed exception spec here. 4261 // We duplicate the one parameter type. 4262 EPI.RefQualifier = OperType->getRefQualifier(); 4263 EPI.ExtInfo = OperType->getExtInfo(); 4264 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4265 4266 // Such a function is also trivial if the implicitly-declared function 4267 // would have been. 4268 MD->setTrivial(MD->getParent()->hasTrivialMoveAssignment()); 4269 } 4270 4271 if (HadError) { 4272 MD->setInvalidDecl(); 4273 return; 4274 } 4275 4276 if (ShouldDeleteSpecialMember(MD, CXXMoveAssignment)) { 4277 if (First) { 4278 MD->setDeletedAsWritten(); 4279 } else { 4280 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4281 << CXXMoveAssignment; 4282 MD->setInvalidDecl(); 4283 } 4284 } 4285} 4286 4287void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 4288 assert(DD->isExplicitlyDefaulted()); 4289 4290 // Whether this was the first-declared instance of the destructor. 4291 bool First = DD == DD->getCanonicalDecl(); 4292 4293 ImplicitExceptionSpecification Spec 4294 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 4295 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4296 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 4297 *ExceptionType = Context.getFunctionType( 4298 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4299 4300 if (DtorType->hasExceptionSpec()) { 4301 if (CheckEquivalentExceptionSpec( 4302 PDiag(diag::err_incorrect_defaulted_exception_spec) 4303 << CXXDestructor, 4304 PDiag(), 4305 ExceptionType, SourceLocation(), 4306 DtorType, DD->getLocation())) { 4307 DD->setInvalidDecl(); 4308 return; 4309 } 4310 } 4311 if (First) { 4312 // We set the declaration to have the computed exception spec here. 4313 // There are no parameters. 4314 EPI.ExtInfo = DtorType->getExtInfo(); 4315 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 4316 4317 // Such a function is also trivial if the implicitly-declared function 4318 // would have been. 4319 DD->setTrivial(DD->getParent()->hasTrivialDestructor()); 4320 } 4321 4322 if (ShouldDeleteSpecialMember(DD, CXXDestructor)) { 4323 if (First) { 4324 DD->setDeletedAsWritten(); 4325 } else { 4326 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 4327 << CXXDestructor; 4328 DD->setInvalidDecl(); 4329 } 4330 } 4331} 4332 4333namespace { 4334struct SpecialMemberDeletionInfo { 4335 Sema &S; 4336 CXXMethodDecl *MD; 4337 Sema::CXXSpecialMember CSM; 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) 4347 : S(S), MD(MD), CSM(CSM), 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 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, FieldDecl *Field); 4391 4392 bool shouldDeleteForBase(CXXRecordDecl *BaseDecl, bool IsVirtualBase); 4393 bool shouldDeleteForField(FieldDecl *FD); 4394 bool shouldDeleteForAllConstMembers(); 4395}; 4396} 4397 4398/// Check whether we should delete a special member function due to having a 4399/// direct or virtual base class or static data member of class type M. 4400bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 4401 CXXRecordDecl *Class, FieldDecl *Field) { 4402 // C++11 [class.ctor]p5, C++11 [class.copy]p11, C++11 [class.dtor]p5: 4403 // -- any direct or virtual base class [...] has a type with a destructor 4404 // that is deleted or inaccessible 4405 if (!IsAssignment) { 4406 CXXDestructorDecl *Dtor = S.LookupDestructor(Class); 4407 if (Dtor->isDeleted()) 4408 return true; 4409 if (S.CheckDestructorAccess(Loc, Dtor, S.PDiag()) != Sema::AR_accessible) 4410 return true; 4411 4412 // C++11 [class.dtor]p5: 4413 // -- X is a union-like class that has a variant member with a non-trivial 4414 // destructor 4415 if (CSM == Sema::CXXDestructor && Field && Field->getParent()->isUnion() && 4416 !Dtor->isTrivial()) 4417 return true; 4418 } 4419 4420 // C++11 [class.ctor]p5: 4421 // -- any direct or virtual base class [...] has class type M [...] and 4422 // either M has no default constructor or overload resolution as applied 4423 // to M's default constructor results in an ambiguity or in a function 4424 // that is deleted or inaccessible 4425 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4426 // -- a direct or virtual base class B that cannot be copied/moved because 4427 // overload resolution, as applied to B's corresponding special member, 4428 // results in an ambiguity or a function that is deleted or inaccessible 4429 // from the defaulted special member 4430 // FIXME: in-class initializers should be handled here 4431 if (CSM != Sema::CXXDestructor) { 4432 Sema::SpecialMemberOverloadResult *SMOR = lookupIn(Class); 4433 if (!SMOR->hasSuccess()) 4434 return true; 4435 4436 CXXMethodDecl *Member = SMOR->getMethod(); 4437 // A member of a union must have a trivial corresponding special member. 4438 if (Field && Field->getParent()->isUnion() && !Member->isTrivial()) 4439 return true; 4440 4441 if (IsConstructor) { 4442 CXXConstructorDecl *Ctor = cast<CXXConstructorDecl>(Member); 4443 if (S.CheckConstructorAccess(Loc, Ctor, Ctor->getAccess(), S.PDiag()) 4444 != Sema::AR_accessible) 4445 return true; 4446 4447 // -- for the move constructor, a [...] direct or virtual base class with 4448 // a type that does not have a move constructor and is not trivially 4449 // copyable. 4450 if (IsMove && !Ctor->isMoveConstructor() && !Class->isTriviallyCopyable()) 4451 return true; 4452 } else { 4453 assert(IsAssignment && "unexpected kind of special member"); 4454 if (S.CheckDirectMemberAccess(Loc, Member, S.PDiag()) 4455 != Sema::AR_accessible) 4456 return true; 4457 4458 // -- for the move assignment operator, a direct base class with a type 4459 // that does not have a move assignment operator and is not trivially 4460 // copyable. 4461 if (IsMove && !Member->isMoveAssignmentOperator() && 4462 !Class->isTriviallyCopyable()) 4463 return true; 4464 } 4465 } 4466 4467 return false; 4468} 4469 4470/// Check whether we should delete a special member function due to the class 4471/// having a particular direct or virtual base class. 4472bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXRecordDecl *BaseDecl, 4473 bool IsVirtualBase) { 4474 // C++11 [class.copy]p23: 4475 // -- for the move assignment operator, any direct or indirect virtual 4476 // base class. 4477 if (CSM == Sema::CXXMoveAssignment && IsVirtualBase) 4478 return true; 4479 4480 if (shouldDeleteForClassSubobject(BaseDecl, 0)) 4481 return true; 4482 4483 return false; 4484} 4485 4486/// Check whether we should delete a special member function due to the class 4487/// having a particular non-static data member. 4488bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4489 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4490 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4491 4492 if (CSM == Sema::CXXDefaultConstructor) { 4493 // For a default constructor, all references must be initialized in-class 4494 // and, if a union, it must have a non-const member. 4495 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) 4496 return true; 4497 4498 if (inUnion() && !FieldType.isConstQualified()) 4499 AllFieldsAreConst = false; 4500 4501 // C++11 [class.ctor]p5: any non-variant non-static data member of 4502 // const-qualified type (or array thereof) with no 4503 // brace-or-equal-initializer does not have a user-provided default 4504 // constructor. 4505 if (!inUnion() && FieldType.isConstQualified() && 4506 !FD->hasInClassInitializer() && 4507 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) 4508 return true; 4509 } else if (CSM == Sema::CXXCopyConstructor) { 4510 // For a copy constructor, data members must not be of rvalue reference 4511 // type. 4512 if (FieldType->isRValueReferenceType()) 4513 return true; 4514 } else if (IsAssignment) { 4515 // For an assignment operator, data members must not be of reference type. 4516 if (FieldType->isReferenceType()) 4517 return true; 4518 } 4519 4520 if (FieldRecord) { 4521 // Some additional restrictions exist on the variant members. 4522 if (!inUnion() && FieldRecord->isUnion() && 4523 FieldRecord->isAnonymousStructOrUnion()) { 4524 bool AllVariantFieldsAreConst = true; 4525 4526 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4527 UE = FieldRecord->field_end(); 4528 UI != UE; ++UI) { 4529 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4530 4531 if (!UnionFieldType.isConstQualified()) 4532 AllVariantFieldsAreConst = false; 4533 4534 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 4535 if (UnionFieldRecord && 4536 shouldDeleteForClassSubobject(UnionFieldRecord, *UI)) 4537 return true; 4538 } 4539 4540 // At least one member in each anonymous union must be non-const 4541 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 4542 FieldRecord->field_begin() != FieldRecord->field_end()) 4543 return true; 4544 4545 // Don't try to initialize the anonymous union 4546 // This is technically non-conformant, but sanity demands it. 4547 return false; 4548 } 4549 4550 // When checking a constructor, the field's destructor must be accessible 4551 // and not deleted. 4552 if (IsConstructor) { 4553 CXXDestructorDecl *FieldDtor = S.LookupDestructor(FieldRecord); 4554 if (FieldDtor->isDeleted()) 4555 return true; 4556 if (S.CheckDestructorAccess(Loc, FieldDtor, S.PDiag()) != 4557 Sema::AR_accessible) 4558 return true; 4559 } 4560 4561 // Check that the corresponding member of the field is accessible, 4562 // unique, and non-deleted. We don't do this if it has an explicit 4563 // initialization when default-constructing. 4564 if (!(CSM == Sema::CXXDefaultConstructor && FD->hasInClassInitializer())) { 4565 Sema::SpecialMemberOverloadResult *SMOR = lookupIn(FieldRecord); 4566 if (!SMOR->hasSuccess()) 4567 return true; 4568 4569 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4570 4571 // We need the corresponding member of a union to be trivial so that 4572 // we can safely process all members simultaneously. 4573 if (inUnion() && !FieldMember->isTrivial()) 4574 return true; 4575 4576 if (IsConstructor) { 4577 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4578 if (S.CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4579 S.PDiag()) != Sema::AR_accessible) 4580 return true; 4581 4582 // For a move operation, the corresponding operation must actually 4583 // be a move operation (and not a copy selected by overload 4584 // resolution) unless we are working on a trivially copyable class. 4585 if (IsMove && !FieldCtor->isMoveConstructor() && 4586 !FieldRecord->isTriviallyCopyable()) 4587 return true; 4588 } else if (CSM == Sema::CXXDestructor) { 4589 CXXDestructorDecl *FieldDtor = S.LookupDestructor(FieldRecord); 4590 if (FieldDtor->isDeleted()) 4591 return true; 4592 if (S.CheckDestructorAccess(Loc, FieldDtor, S.PDiag()) != 4593 Sema::AR_accessible) 4594 return true; 4595 } else { 4596 assert(IsAssignment && "unexpected kind of special member"); 4597 if (S.CheckDirectMemberAccess(Loc, FieldMember, S.PDiag()) 4598 != Sema::AR_accessible) 4599 return true; 4600 4601 // -- for the move assignment operator, a non-static data member with a 4602 // type that does not have a move assignment operator and is not 4603 // trivially copyable. 4604 if (IsMove && !FieldMember->isMoveAssignmentOperator() && 4605 !FieldRecord->isTriviallyCopyable()) 4606 return true; 4607 } 4608 } 4609 } else if (IsAssignment && FieldType.isConstQualified()) { 4610 // C++11 [class.copy]p23: 4611 // -- a non-static data member of const non-class type (or array thereof) 4612 return true; 4613 } 4614 4615 return false; 4616} 4617 4618/// C++11 [class.ctor] p5: 4619/// A defaulted default constructor for a class X is defined as deleted if 4620/// X is a union and all of its variant members are of const-qualified type. 4621bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4622 // This is a silly definition, because it gives an empty union a deleted 4623 // default constructor. Don't do that. 4624 return CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 4625 (MD->getParent()->field_begin() != MD->getParent()->field_end()); 4626} 4627 4628/// Determine whether a defaulted special member function should be defined as 4629/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4630/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4631bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM) { 4632 assert(!MD->isInvalidDecl()); 4633 CXXRecordDecl *RD = MD->getParent(); 4634 assert(!RD->isDependentType() && "do deletion after instantiation"); 4635 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4636 return false; 4637 4638 // FIXME: Provide the ability to diagnose why a special member was deleted. 4639 4640 // C++11 [expr.lambda.prim]p19: 4641 // The closure type associated with a lambda-expression has a 4642 // deleted (8.4.3) default constructor and a deleted copy 4643 // assignment operator. 4644 if (RD->isLambda() && 4645 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) 4646 return true; 4647 4648 // C++11 [class.dtor]p5: 4649 // -- for a virtual destructor, lookup of the non-array deallocation function 4650 // results in an ambiguity or in a function that is deleted or inaccessible 4651 if (CSM == Sema::CXXDestructor && MD->isVirtual()) { 4652 FunctionDecl *OperatorDelete = 0; 4653 DeclarationName Name = 4654 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4655 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 4656 OperatorDelete, false)) 4657 return true; 4658 } 4659 4660 // For an anonymous struct or union, the copy and assignment special members 4661 // will never be used, so skip the check. For an anonymous union declared at 4662 // namespace scope, the constructor and destructor are used. 4663 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4664 RD->isAnonymousStructOrUnion()) 4665 return false; 4666 4667 // Do access control from the special member function 4668 ContextRAII MethodContext(*this, MD); 4669 4670 SpecialMemberDeletionInfo SMI(*this, MD, CSM); 4671 4672 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4673 BE = RD->bases_end(); BI != BE; ++BI) 4674 if (!BI->isVirtual() && 4675 SMI.shouldDeleteForBase(BI->getType()->getAsCXXRecordDecl(), false)) 4676 return true; 4677 4678 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4679 BE = RD->vbases_end(); BI != BE; ++BI) 4680 if (SMI.shouldDeleteForBase(BI->getType()->getAsCXXRecordDecl(), true)) 4681 return true; 4682 4683 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4684 FE = RD->field_end(); FI != FE; ++FI) 4685 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 4686 SMI.shouldDeleteForField(*FI)) 4687 return true; 4688 4689 if (SMI.shouldDeleteForAllConstMembers()) 4690 return true; 4691 4692 return false; 4693} 4694 4695/// \brief Data used with FindHiddenVirtualMethod 4696namespace { 4697 struct FindHiddenVirtualMethodData { 4698 Sema *S; 4699 CXXMethodDecl *Method; 4700 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4701 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4702 }; 4703} 4704 4705/// \brief Member lookup function that determines whether a given C++ 4706/// method overloads virtual methods in a base class without overriding any, 4707/// to be used with CXXRecordDecl::lookupInBases(). 4708static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4709 CXXBasePath &Path, 4710 void *UserData) { 4711 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4712 4713 FindHiddenVirtualMethodData &Data 4714 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4715 4716 DeclarationName Name = Data.Method->getDeclName(); 4717 assert(Name.getNameKind() == DeclarationName::Identifier); 4718 4719 bool foundSameNameMethod = false; 4720 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4721 for (Path.Decls = BaseRecord->lookup(Name); 4722 Path.Decls.first != Path.Decls.second; 4723 ++Path.Decls.first) { 4724 NamedDecl *D = *Path.Decls.first; 4725 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4726 MD = MD->getCanonicalDecl(); 4727 foundSameNameMethod = true; 4728 // Interested only in hidden virtual methods. 4729 if (!MD->isVirtual()) 4730 continue; 4731 // If the method we are checking overrides a method from its base 4732 // don't warn about the other overloaded methods. 4733 if (!Data.S->IsOverload(Data.Method, MD, false)) 4734 return true; 4735 // Collect the overload only if its hidden. 4736 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4737 overloadedMethods.push_back(MD); 4738 } 4739 } 4740 4741 if (foundSameNameMethod) 4742 Data.OverloadedMethods.append(overloadedMethods.begin(), 4743 overloadedMethods.end()); 4744 return foundSameNameMethod; 4745} 4746 4747/// \brief See if a method overloads virtual methods in a base class without 4748/// overriding any. 4749void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4750 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4751 MD->getLocation()) == DiagnosticsEngine::Ignored) 4752 return; 4753 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4754 return; 4755 4756 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4757 /*bool RecordPaths=*/false, 4758 /*bool DetectVirtual=*/false); 4759 FindHiddenVirtualMethodData Data; 4760 Data.Method = MD; 4761 Data.S = this; 4762 4763 // Keep the base methods that were overriden or introduced in the subclass 4764 // by 'using' in a set. A base method not in this set is hidden. 4765 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4766 res.first != res.second; ++res.first) { 4767 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4768 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4769 E = MD->end_overridden_methods(); 4770 I != E; ++I) 4771 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4772 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4773 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4774 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4775 } 4776 4777 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4778 !Data.OverloadedMethods.empty()) { 4779 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4780 << MD << (Data.OverloadedMethods.size() > 1); 4781 4782 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4783 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4784 Diag(overloadedMD->getLocation(), 4785 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4786 } 4787 } 4788} 4789 4790void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4791 Decl *TagDecl, 4792 SourceLocation LBrac, 4793 SourceLocation RBrac, 4794 AttributeList *AttrList) { 4795 if (!TagDecl) 4796 return; 4797 4798 AdjustDeclIfTemplate(TagDecl); 4799 4800 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4801 // strict aliasing violation! 4802 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4803 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4804 4805 CheckCompletedCXXClass( 4806 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4807} 4808 4809/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4810/// special functions, such as the default constructor, copy 4811/// constructor, or destructor, to the given C++ class (C++ 4812/// [special]p1). This routine can only be executed just before the 4813/// definition of the class is complete. 4814void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4815 if (!ClassDecl->hasUserDeclaredConstructor()) 4816 ++ASTContext::NumImplicitDefaultConstructors; 4817 4818 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4819 ++ASTContext::NumImplicitCopyConstructors; 4820 4821 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 4822 ++ASTContext::NumImplicitMoveConstructors; 4823 4824 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4825 ++ASTContext::NumImplicitCopyAssignmentOperators; 4826 4827 // If we have a dynamic class, then the copy assignment operator may be 4828 // virtual, so we have to declare it immediately. This ensures that, e.g., 4829 // it shows up in the right place in the vtable and that we diagnose 4830 // problems with the implicit exception specification. 4831 if (ClassDecl->isDynamicClass()) 4832 DeclareImplicitCopyAssignment(ClassDecl); 4833 } 4834 4835 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()){ 4836 ++ASTContext::NumImplicitMoveAssignmentOperators; 4837 4838 // Likewise for the move assignment operator. 4839 if (ClassDecl->isDynamicClass()) 4840 DeclareImplicitMoveAssignment(ClassDecl); 4841 } 4842 4843 if (!ClassDecl->hasUserDeclaredDestructor()) { 4844 ++ASTContext::NumImplicitDestructors; 4845 4846 // If we have a dynamic class, then the destructor may be virtual, so we 4847 // have to declare the destructor immediately. This ensures that, e.g., it 4848 // shows up in the right place in the vtable and that we diagnose problems 4849 // with the implicit exception specification. 4850 if (ClassDecl->isDynamicClass()) 4851 DeclareImplicitDestructor(ClassDecl); 4852 } 4853} 4854 4855void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4856 if (!D) 4857 return; 4858 4859 int NumParamList = D->getNumTemplateParameterLists(); 4860 for (int i = 0; i < NumParamList; i++) { 4861 TemplateParameterList* Params = D->getTemplateParameterList(i); 4862 for (TemplateParameterList::iterator Param = Params->begin(), 4863 ParamEnd = Params->end(); 4864 Param != ParamEnd; ++Param) { 4865 NamedDecl *Named = cast<NamedDecl>(*Param); 4866 if (Named->getDeclName()) { 4867 S->AddDecl(Named); 4868 IdResolver.AddDecl(Named); 4869 } 4870 } 4871 } 4872} 4873 4874void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4875 if (!D) 4876 return; 4877 4878 TemplateParameterList *Params = 0; 4879 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4880 Params = Template->getTemplateParameters(); 4881 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4882 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4883 Params = PartialSpec->getTemplateParameters(); 4884 else 4885 return; 4886 4887 for (TemplateParameterList::iterator Param = Params->begin(), 4888 ParamEnd = Params->end(); 4889 Param != ParamEnd; ++Param) { 4890 NamedDecl *Named = cast<NamedDecl>(*Param); 4891 if (Named->getDeclName()) { 4892 S->AddDecl(Named); 4893 IdResolver.AddDecl(Named); 4894 } 4895 } 4896} 4897 4898void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4899 if (!RecordD) return; 4900 AdjustDeclIfTemplate(RecordD); 4901 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4902 PushDeclContext(S, Record); 4903} 4904 4905void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4906 if (!RecordD) return; 4907 PopDeclContext(); 4908} 4909 4910/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4911/// parsing a top-level (non-nested) C++ class, and we are now 4912/// parsing those parts of the given Method declaration that could 4913/// not be parsed earlier (C++ [class.mem]p2), such as default 4914/// arguments. This action should enter the scope of the given 4915/// Method declaration as if we had just parsed the qualified method 4916/// name. However, it should not bring the parameters into scope; 4917/// that will be performed by ActOnDelayedCXXMethodParameter. 4918void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4919} 4920 4921/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4922/// C++ method declaration. We're (re-)introducing the given 4923/// function parameter into scope for use in parsing later parts of 4924/// the method declaration. For example, we could see an 4925/// ActOnParamDefaultArgument event for this parameter. 4926void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4927 if (!ParamD) 4928 return; 4929 4930 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4931 4932 // If this parameter has an unparsed default argument, clear it out 4933 // to make way for the parsed default argument. 4934 if (Param->hasUnparsedDefaultArg()) 4935 Param->setDefaultArg(0); 4936 4937 S->AddDecl(Param); 4938 if (Param->getDeclName()) 4939 IdResolver.AddDecl(Param); 4940} 4941 4942/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4943/// processing the delayed method declaration for Method. The method 4944/// declaration is now considered finished. There may be a separate 4945/// ActOnStartOfFunctionDef action later (not necessarily 4946/// immediately!) for this method, if it was also defined inside the 4947/// class body. 4948void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4949 if (!MethodD) 4950 return; 4951 4952 AdjustDeclIfTemplate(MethodD); 4953 4954 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4955 4956 // Now that we have our default arguments, check the constructor 4957 // again. It could produce additional diagnostics or affect whether 4958 // the class has implicitly-declared destructors, among other 4959 // things. 4960 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4961 CheckConstructor(Constructor); 4962 4963 // Check the default arguments, which we may have added. 4964 if (!Method->isInvalidDecl()) 4965 CheckCXXDefaultArguments(Method); 4966} 4967 4968/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4969/// the well-formedness of the constructor declarator @p D with type @p 4970/// R. If there are any errors in the declarator, this routine will 4971/// emit diagnostics and set the invalid bit to true. In any case, the type 4972/// will be updated to reflect a well-formed type for the constructor and 4973/// returned. 4974QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4975 StorageClass &SC) { 4976 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4977 4978 // C++ [class.ctor]p3: 4979 // A constructor shall not be virtual (10.3) or static (9.4). A 4980 // constructor can be invoked for a const, volatile or const 4981 // volatile object. A constructor shall not be declared const, 4982 // volatile, or const volatile (9.3.2). 4983 if (isVirtual) { 4984 if (!D.isInvalidType()) 4985 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4986 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4987 << SourceRange(D.getIdentifierLoc()); 4988 D.setInvalidType(); 4989 } 4990 if (SC == SC_Static) { 4991 if (!D.isInvalidType()) 4992 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4993 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4994 << SourceRange(D.getIdentifierLoc()); 4995 D.setInvalidType(); 4996 SC = SC_None; 4997 } 4998 4999 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5000 if (FTI.TypeQuals != 0) { 5001 if (FTI.TypeQuals & Qualifiers::Const) 5002 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5003 << "const" << SourceRange(D.getIdentifierLoc()); 5004 if (FTI.TypeQuals & Qualifiers::Volatile) 5005 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5006 << "volatile" << SourceRange(D.getIdentifierLoc()); 5007 if (FTI.TypeQuals & Qualifiers::Restrict) 5008 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5009 << "restrict" << SourceRange(D.getIdentifierLoc()); 5010 D.setInvalidType(); 5011 } 5012 5013 // C++0x [class.ctor]p4: 5014 // A constructor shall not be declared with a ref-qualifier. 5015 if (FTI.hasRefQualifier()) { 5016 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5017 << FTI.RefQualifierIsLValueRef 5018 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5019 D.setInvalidType(); 5020 } 5021 5022 // Rebuild the function type "R" without any type qualifiers (in 5023 // case any of the errors above fired) and with "void" as the 5024 // return type, since constructors don't have return types. 5025 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5026 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5027 return R; 5028 5029 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5030 EPI.TypeQuals = 0; 5031 EPI.RefQualifier = RQ_None; 5032 5033 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5034 Proto->getNumArgs(), EPI); 5035} 5036 5037/// CheckConstructor - Checks a fully-formed constructor for 5038/// well-formedness, issuing any diagnostics required. Returns true if 5039/// the constructor declarator is invalid. 5040void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5041 CXXRecordDecl *ClassDecl 5042 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5043 if (!ClassDecl) 5044 return Constructor->setInvalidDecl(); 5045 5046 // C++ [class.copy]p3: 5047 // A declaration of a constructor for a class X is ill-formed if 5048 // its first parameter is of type (optionally cv-qualified) X and 5049 // either there are no other parameters or else all other 5050 // parameters have default arguments. 5051 if (!Constructor->isInvalidDecl() && 5052 ((Constructor->getNumParams() == 1) || 5053 (Constructor->getNumParams() > 1 && 5054 Constructor->getParamDecl(1)->hasDefaultArg())) && 5055 Constructor->getTemplateSpecializationKind() 5056 != TSK_ImplicitInstantiation) { 5057 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5058 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5059 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5060 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5061 const char *ConstRef 5062 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5063 : " const &"; 5064 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5065 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5066 5067 // FIXME: Rather that making the constructor invalid, we should endeavor 5068 // to fix the type. 5069 Constructor->setInvalidDecl(); 5070 } 5071 } 5072} 5073 5074/// CheckDestructor - Checks a fully-formed destructor definition for 5075/// well-formedness, issuing any diagnostics required. Returns true 5076/// on error. 5077bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5078 CXXRecordDecl *RD = Destructor->getParent(); 5079 5080 if (Destructor->isVirtual()) { 5081 SourceLocation Loc; 5082 5083 if (!Destructor->isImplicit()) 5084 Loc = Destructor->getLocation(); 5085 else 5086 Loc = RD->getLocation(); 5087 5088 // If we have a virtual destructor, look up the deallocation function 5089 FunctionDecl *OperatorDelete = 0; 5090 DeclarationName Name = 5091 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5092 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5093 return true; 5094 5095 MarkFunctionReferenced(Loc, OperatorDelete); 5096 5097 Destructor->setOperatorDelete(OperatorDelete); 5098 } 5099 5100 return false; 5101} 5102 5103static inline bool 5104FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5105 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5106 FTI.ArgInfo[0].Param && 5107 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5108} 5109 5110/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5111/// the well-formednes of the destructor declarator @p D with type @p 5112/// R. If there are any errors in the declarator, this routine will 5113/// emit diagnostics and set the declarator to invalid. Even if this happens, 5114/// will be updated to reflect a well-formed type for the destructor and 5115/// returned. 5116QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5117 StorageClass& SC) { 5118 // C++ [class.dtor]p1: 5119 // [...] A typedef-name that names a class is a class-name 5120 // (7.1.3); however, a typedef-name that names a class shall not 5121 // be used as the identifier in the declarator for a destructor 5122 // declaration. 5123 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5124 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5125 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5126 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5127 else if (const TemplateSpecializationType *TST = 5128 DeclaratorType->getAs<TemplateSpecializationType>()) 5129 if (TST->isTypeAlias()) 5130 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5131 << DeclaratorType << 1; 5132 5133 // C++ [class.dtor]p2: 5134 // A destructor is used to destroy objects of its class type. A 5135 // destructor takes no parameters, and no return type can be 5136 // specified for it (not even void). The address of a destructor 5137 // shall not be taken. A destructor shall not be static. A 5138 // destructor can be invoked for a const, volatile or const 5139 // volatile object. A destructor shall not be declared const, 5140 // volatile or const volatile (9.3.2). 5141 if (SC == SC_Static) { 5142 if (!D.isInvalidType()) 5143 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5144 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5145 << SourceRange(D.getIdentifierLoc()) 5146 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5147 5148 SC = SC_None; 5149 } 5150 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5151 // Destructors don't have return types, but the parser will 5152 // happily parse something like: 5153 // 5154 // class X { 5155 // float ~X(); 5156 // }; 5157 // 5158 // The return type will be eliminated later. 5159 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5160 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5161 << SourceRange(D.getIdentifierLoc()); 5162 } 5163 5164 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5165 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5166 if (FTI.TypeQuals & Qualifiers::Const) 5167 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5168 << "const" << SourceRange(D.getIdentifierLoc()); 5169 if (FTI.TypeQuals & Qualifiers::Volatile) 5170 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5171 << "volatile" << SourceRange(D.getIdentifierLoc()); 5172 if (FTI.TypeQuals & Qualifiers::Restrict) 5173 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5174 << "restrict" << SourceRange(D.getIdentifierLoc()); 5175 D.setInvalidType(); 5176 } 5177 5178 // C++0x [class.dtor]p2: 5179 // A destructor shall not be declared with a ref-qualifier. 5180 if (FTI.hasRefQualifier()) { 5181 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5182 << FTI.RefQualifierIsLValueRef 5183 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5184 D.setInvalidType(); 5185 } 5186 5187 // Make sure we don't have any parameters. 5188 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5189 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5190 5191 // Delete the parameters. 5192 FTI.freeArgs(); 5193 D.setInvalidType(); 5194 } 5195 5196 // Make sure the destructor isn't variadic. 5197 if (FTI.isVariadic) { 5198 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5199 D.setInvalidType(); 5200 } 5201 5202 // Rebuild the function type "R" without any type qualifiers or 5203 // parameters (in case any of the errors above fired) and with 5204 // "void" as the return type, since destructors don't have return 5205 // types. 5206 if (!D.isInvalidType()) 5207 return R; 5208 5209 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5210 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5211 EPI.Variadic = false; 5212 EPI.TypeQuals = 0; 5213 EPI.RefQualifier = RQ_None; 5214 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5215} 5216 5217/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5218/// well-formednes of the conversion function declarator @p D with 5219/// type @p R. If there are any errors in the declarator, this routine 5220/// will emit diagnostics and return true. Otherwise, it will return 5221/// false. Either way, the type @p R will be updated to reflect a 5222/// well-formed type for the conversion operator. 5223void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5224 StorageClass& SC) { 5225 // C++ [class.conv.fct]p1: 5226 // Neither parameter types nor return type can be specified. The 5227 // type of a conversion function (8.3.5) is "function taking no 5228 // parameter returning conversion-type-id." 5229 if (SC == SC_Static) { 5230 if (!D.isInvalidType()) 5231 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5232 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5233 << SourceRange(D.getIdentifierLoc()); 5234 D.setInvalidType(); 5235 SC = SC_None; 5236 } 5237 5238 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5239 5240 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5241 // Conversion functions don't have return types, but the parser will 5242 // happily parse something like: 5243 // 5244 // class X { 5245 // float operator bool(); 5246 // }; 5247 // 5248 // The return type will be changed later anyway. 5249 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5250 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5251 << SourceRange(D.getIdentifierLoc()); 5252 D.setInvalidType(); 5253 } 5254 5255 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5256 5257 // Make sure we don't have any parameters. 5258 if (Proto->getNumArgs() > 0) { 5259 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5260 5261 // Delete the parameters. 5262 D.getFunctionTypeInfo().freeArgs(); 5263 D.setInvalidType(); 5264 } else if (Proto->isVariadic()) { 5265 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5266 D.setInvalidType(); 5267 } 5268 5269 // Diagnose "&operator bool()" and other such nonsense. This 5270 // is actually a gcc extension which we don't support. 5271 if (Proto->getResultType() != ConvType) { 5272 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5273 << Proto->getResultType(); 5274 D.setInvalidType(); 5275 ConvType = Proto->getResultType(); 5276 } 5277 5278 // C++ [class.conv.fct]p4: 5279 // The conversion-type-id shall not represent a function type nor 5280 // an array type. 5281 if (ConvType->isArrayType()) { 5282 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5283 ConvType = Context.getPointerType(ConvType); 5284 D.setInvalidType(); 5285 } else if (ConvType->isFunctionType()) { 5286 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5287 ConvType = Context.getPointerType(ConvType); 5288 D.setInvalidType(); 5289 } 5290 5291 // Rebuild the function type "R" without any parameters (in case any 5292 // of the errors above fired) and with the conversion type as the 5293 // return type. 5294 if (D.isInvalidType()) 5295 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5296 5297 // C++0x explicit conversion operators. 5298 if (D.getDeclSpec().isExplicitSpecified()) 5299 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5300 getLangOpts().CPlusPlus0x ? 5301 diag::warn_cxx98_compat_explicit_conversion_functions : 5302 diag::ext_explicit_conversion_functions) 5303 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5304} 5305 5306/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5307/// the declaration of the given C++ conversion function. This routine 5308/// is responsible for recording the conversion function in the C++ 5309/// class, if possible. 5310Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5311 assert(Conversion && "Expected to receive a conversion function declaration"); 5312 5313 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5314 5315 // Make sure we aren't redeclaring the conversion function. 5316 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5317 5318 // C++ [class.conv.fct]p1: 5319 // [...] A conversion function is never used to convert a 5320 // (possibly cv-qualified) object to the (possibly cv-qualified) 5321 // same object type (or a reference to it), to a (possibly 5322 // cv-qualified) base class of that type (or a reference to it), 5323 // or to (possibly cv-qualified) void. 5324 // FIXME: Suppress this warning if the conversion function ends up being a 5325 // virtual function that overrides a virtual function in a base class. 5326 QualType ClassType 5327 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5328 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5329 ConvType = ConvTypeRef->getPointeeType(); 5330 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5331 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5332 /* Suppress diagnostics for instantiations. */; 5333 else if (ConvType->isRecordType()) { 5334 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5335 if (ConvType == ClassType) 5336 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5337 << ClassType; 5338 else if (IsDerivedFrom(ClassType, ConvType)) 5339 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5340 << ClassType << ConvType; 5341 } else if (ConvType->isVoidType()) { 5342 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5343 << ClassType << ConvType; 5344 } 5345 5346 if (FunctionTemplateDecl *ConversionTemplate 5347 = Conversion->getDescribedFunctionTemplate()) 5348 return ConversionTemplate; 5349 5350 return Conversion; 5351} 5352 5353//===----------------------------------------------------------------------===// 5354// Namespace Handling 5355//===----------------------------------------------------------------------===// 5356 5357 5358 5359/// ActOnStartNamespaceDef - This is called at the start of a namespace 5360/// definition. 5361Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5362 SourceLocation InlineLoc, 5363 SourceLocation NamespaceLoc, 5364 SourceLocation IdentLoc, 5365 IdentifierInfo *II, 5366 SourceLocation LBrace, 5367 AttributeList *AttrList) { 5368 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5369 // For anonymous namespace, take the location of the left brace. 5370 SourceLocation Loc = II ? IdentLoc : LBrace; 5371 bool IsInline = InlineLoc.isValid(); 5372 bool IsInvalid = false; 5373 bool IsStd = false; 5374 bool AddToKnown = false; 5375 Scope *DeclRegionScope = NamespcScope->getParent(); 5376 5377 NamespaceDecl *PrevNS = 0; 5378 if (II) { 5379 // C++ [namespace.def]p2: 5380 // The identifier in an original-namespace-definition shall not 5381 // have been previously defined in the declarative region in 5382 // which the original-namespace-definition appears. The 5383 // identifier in an original-namespace-definition is the name of 5384 // the namespace. Subsequently in that declarative region, it is 5385 // treated as an original-namespace-name. 5386 // 5387 // Since namespace names are unique in their scope, and we don't 5388 // look through using directives, just look for any ordinary names. 5389 5390 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5391 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5392 Decl::IDNS_Namespace; 5393 NamedDecl *PrevDecl = 0; 5394 for (DeclContext::lookup_result R 5395 = CurContext->getRedeclContext()->lookup(II); 5396 R.first != R.second; ++R.first) { 5397 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5398 PrevDecl = *R.first; 5399 break; 5400 } 5401 } 5402 5403 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5404 5405 if (PrevNS) { 5406 // This is an extended namespace definition. 5407 if (IsInline != PrevNS->isInline()) { 5408 // inline-ness must match 5409 if (PrevNS->isInline()) { 5410 // The user probably just forgot the 'inline', so suggest that it 5411 // be added back. 5412 Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5413 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5414 } else { 5415 Diag(Loc, diag::err_inline_namespace_mismatch) 5416 << IsInline; 5417 } 5418 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5419 5420 IsInline = PrevNS->isInline(); 5421 } 5422 } else if (PrevDecl) { 5423 // This is an invalid name redefinition. 5424 Diag(Loc, diag::err_redefinition_different_kind) 5425 << II; 5426 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5427 IsInvalid = true; 5428 // Continue on to push Namespc as current DeclContext and return it. 5429 } else if (II->isStr("std") && 5430 CurContext->getRedeclContext()->isTranslationUnit()) { 5431 // This is the first "real" definition of the namespace "std", so update 5432 // our cache of the "std" namespace to point at this definition. 5433 PrevNS = getStdNamespace(); 5434 IsStd = true; 5435 AddToKnown = !IsInline; 5436 } else { 5437 // We've seen this namespace for the first time. 5438 AddToKnown = !IsInline; 5439 } 5440 } else { 5441 // Anonymous namespaces. 5442 5443 // Determine whether the parent already has an anonymous namespace. 5444 DeclContext *Parent = CurContext->getRedeclContext(); 5445 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5446 PrevNS = TU->getAnonymousNamespace(); 5447 } else { 5448 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5449 PrevNS = ND->getAnonymousNamespace(); 5450 } 5451 5452 if (PrevNS && IsInline != PrevNS->isInline()) { 5453 // inline-ness must match 5454 Diag(Loc, diag::err_inline_namespace_mismatch) 5455 << IsInline; 5456 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5457 5458 // Recover by ignoring the new namespace's inline status. 5459 IsInline = PrevNS->isInline(); 5460 } 5461 } 5462 5463 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5464 StartLoc, Loc, II, PrevNS); 5465 if (IsInvalid) 5466 Namespc->setInvalidDecl(); 5467 5468 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5469 5470 // FIXME: Should we be merging attributes? 5471 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5472 PushNamespaceVisibilityAttr(Attr, Loc); 5473 5474 if (IsStd) 5475 StdNamespace = Namespc; 5476 if (AddToKnown) 5477 KnownNamespaces[Namespc] = false; 5478 5479 if (II) { 5480 PushOnScopeChains(Namespc, DeclRegionScope); 5481 } else { 5482 // Link the anonymous namespace into its parent. 5483 DeclContext *Parent = CurContext->getRedeclContext(); 5484 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5485 TU->setAnonymousNamespace(Namespc); 5486 } else { 5487 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5488 } 5489 5490 CurContext->addDecl(Namespc); 5491 5492 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5493 // behaves as if it were replaced by 5494 // namespace unique { /* empty body */ } 5495 // using namespace unique; 5496 // namespace unique { namespace-body } 5497 // where all occurrences of 'unique' in a translation unit are 5498 // replaced by the same identifier and this identifier differs 5499 // from all other identifiers in the entire program. 5500 5501 // We just create the namespace with an empty name and then add an 5502 // implicit using declaration, just like the standard suggests. 5503 // 5504 // CodeGen enforces the "universally unique" aspect by giving all 5505 // declarations semantically contained within an anonymous 5506 // namespace internal linkage. 5507 5508 if (!PrevNS) { 5509 UsingDirectiveDecl* UD 5510 = UsingDirectiveDecl::Create(Context, CurContext, 5511 /* 'using' */ LBrace, 5512 /* 'namespace' */ SourceLocation(), 5513 /* qualifier */ NestedNameSpecifierLoc(), 5514 /* identifier */ SourceLocation(), 5515 Namespc, 5516 /* Ancestor */ CurContext); 5517 UD->setImplicit(); 5518 CurContext->addDecl(UD); 5519 } 5520 } 5521 5522 // Although we could have an invalid decl (i.e. the namespace name is a 5523 // redefinition), push it as current DeclContext and try to continue parsing. 5524 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5525 // for the namespace has the declarations that showed up in that particular 5526 // namespace definition. 5527 PushDeclContext(NamespcScope, Namespc); 5528 return Namespc; 5529} 5530 5531/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5532/// is a namespace alias, returns the namespace it points to. 5533static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5534 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5535 return AD->getNamespace(); 5536 return dyn_cast_or_null<NamespaceDecl>(D); 5537} 5538 5539/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5540/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5541void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5542 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5543 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5544 Namespc->setRBraceLoc(RBrace); 5545 PopDeclContext(); 5546 if (Namespc->hasAttr<VisibilityAttr>()) 5547 PopPragmaVisibility(true, RBrace); 5548} 5549 5550CXXRecordDecl *Sema::getStdBadAlloc() const { 5551 return cast_or_null<CXXRecordDecl>( 5552 StdBadAlloc.get(Context.getExternalSource())); 5553} 5554 5555NamespaceDecl *Sema::getStdNamespace() const { 5556 return cast_or_null<NamespaceDecl>( 5557 StdNamespace.get(Context.getExternalSource())); 5558} 5559 5560/// \brief Retrieve the special "std" namespace, which may require us to 5561/// implicitly define the namespace. 5562NamespaceDecl *Sema::getOrCreateStdNamespace() { 5563 if (!StdNamespace) { 5564 // The "std" namespace has not yet been defined, so build one implicitly. 5565 StdNamespace = NamespaceDecl::Create(Context, 5566 Context.getTranslationUnitDecl(), 5567 /*Inline=*/false, 5568 SourceLocation(), SourceLocation(), 5569 &PP.getIdentifierTable().get("std"), 5570 /*PrevDecl=*/0); 5571 getStdNamespace()->setImplicit(true); 5572 } 5573 5574 return getStdNamespace(); 5575} 5576 5577bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 5578 assert(getLangOpts().CPlusPlus && 5579 "Looking for std::initializer_list outside of C++."); 5580 5581 // We're looking for implicit instantiations of 5582 // template <typename E> class std::initializer_list. 5583 5584 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 5585 return false; 5586 5587 ClassTemplateDecl *Template = 0; 5588 const TemplateArgument *Arguments = 0; 5589 5590 if (const RecordType *RT = Ty->getAs<RecordType>()) { 5591 5592 ClassTemplateSpecializationDecl *Specialization = 5593 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 5594 if (!Specialization) 5595 return false; 5596 5597 Template = Specialization->getSpecializedTemplate(); 5598 Arguments = Specialization->getTemplateArgs().data(); 5599 } else if (const TemplateSpecializationType *TST = 5600 Ty->getAs<TemplateSpecializationType>()) { 5601 Template = dyn_cast_or_null<ClassTemplateDecl>( 5602 TST->getTemplateName().getAsTemplateDecl()); 5603 Arguments = TST->getArgs(); 5604 } 5605 if (!Template) 5606 return false; 5607 5608 if (!StdInitializerList) { 5609 // Haven't recognized std::initializer_list yet, maybe this is it. 5610 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 5611 if (TemplateClass->getIdentifier() != 5612 &PP.getIdentifierTable().get("initializer_list") || 5613 !getStdNamespace()->InEnclosingNamespaceSetOf( 5614 TemplateClass->getDeclContext())) 5615 return false; 5616 // This is a template called std::initializer_list, but is it the right 5617 // template? 5618 TemplateParameterList *Params = Template->getTemplateParameters(); 5619 if (Params->getMinRequiredArguments() != 1) 5620 return false; 5621 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 5622 return false; 5623 5624 // It's the right template. 5625 StdInitializerList = Template; 5626 } 5627 5628 if (Template != StdInitializerList) 5629 return false; 5630 5631 // This is an instance of std::initializer_list. Find the argument type. 5632 if (Element) 5633 *Element = Arguments[0].getAsType(); 5634 return true; 5635} 5636 5637static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 5638 NamespaceDecl *Std = S.getStdNamespace(); 5639 if (!Std) { 5640 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5641 return 0; 5642 } 5643 5644 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 5645 Loc, Sema::LookupOrdinaryName); 5646 if (!S.LookupQualifiedName(Result, Std)) { 5647 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5648 return 0; 5649 } 5650 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 5651 if (!Template) { 5652 Result.suppressDiagnostics(); 5653 // We found something weird. Complain about the first thing we found. 5654 NamedDecl *Found = *Result.begin(); 5655 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 5656 return 0; 5657 } 5658 5659 // We found some template called std::initializer_list. Now verify that it's 5660 // correct. 5661 TemplateParameterList *Params = Template->getTemplateParameters(); 5662 if (Params->getMinRequiredArguments() != 1 || 5663 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 5664 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 5665 return 0; 5666 } 5667 5668 return Template; 5669} 5670 5671QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 5672 if (!StdInitializerList) { 5673 StdInitializerList = LookupStdInitializerList(*this, Loc); 5674 if (!StdInitializerList) 5675 return QualType(); 5676 } 5677 5678 TemplateArgumentListInfo Args(Loc, Loc); 5679 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 5680 Context.getTrivialTypeSourceInfo(Element, 5681 Loc))); 5682 return Context.getCanonicalType( 5683 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 5684} 5685 5686bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 5687 // C++ [dcl.init.list]p2: 5688 // A constructor is an initializer-list constructor if its first parameter 5689 // is of type std::initializer_list<E> or reference to possibly cv-qualified 5690 // std::initializer_list<E> for some type E, and either there are no other 5691 // parameters or else all other parameters have default arguments. 5692 if (Ctor->getNumParams() < 1 || 5693 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 5694 return false; 5695 5696 QualType ArgType = Ctor->getParamDecl(0)->getType(); 5697 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 5698 ArgType = RT->getPointeeType().getUnqualifiedType(); 5699 5700 return isStdInitializerList(ArgType, 0); 5701} 5702 5703/// \brief Determine whether a using statement is in a context where it will be 5704/// apply in all contexts. 5705static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5706 switch (CurContext->getDeclKind()) { 5707 case Decl::TranslationUnit: 5708 return true; 5709 case Decl::LinkageSpec: 5710 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5711 default: 5712 return false; 5713 } 5714} 5715 5716namespace { 5717 5718// Callback to only accept typo corrections that are namespaces. 5719class NamespaceValidatorCCC : public CorrectionCandidateCallback { 5720 public: 5721 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5722 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 5723 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 5724 } 5725 return false; 5726 } 5727}; 5728 5729} 5730 5731static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5732 CXXScopeSpec &SS, 5733 SourceLocation IdentLoc, 5734 IdentifierInfo *Ident) { 5735 NamespaceValidatorCCC Validator; 5736 R.clear(); 5737 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5738 R.getLookupKind(), Sc, &SS, 5739 Validator)) { 5740 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 5741 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOpts())); 5742 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5743 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5744 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5745 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5746 else 5747 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5748 << Ident << CorrectedQuotedStr 5749 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5750 5751 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5752 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5753 5754 Ident = Corrected.getCorrectionAsIdentifierInfo(); 5755 R.addDecl(Corrected.getCorrectionDecl()); 5756 return true; 5757 } 5758 return false; 5759} 5760 5761Decl *Sema::ActOnUsingDirective(Scope *S, 5762 SourceLocation UsingLoc, 5763 SourceLocation NamespcLoc, 5764 CXXScopeSpec &SS, 5765 SourceLocation IdentLoc, 5766 IdentifierInfo *NamespcName, 5767 AttributeList *AttrList) { 5768 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5769 assert(NamespcName && "Invalid NamespcName."); 5770 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5771 5772 // This can only happen along a recovery path. 5773 while (S->getFlags() & Scope::TemplateParamScope) 5774 S = S->getParent(); 5775 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5776 5777 UsingDirectiveDecl *UDir = 0; 5778 NestedNameSpecifier *Qualifier = 0; 5779 if (SS.isSet()) 5780 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5781 5782 // Lookup namespace name. 5783 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5784 LookupParsedName(R, S, &SS); 5785 if (R.isAmbiguous()) 5786 return 0; 5787 5788 if (R.empty()) { 5789 R.clear(); 5790 // Allow "using namespace std;" or "using namespace ::std;" even if 5791 // "std" hasn't been defined yet, for GCC compatibility. 5792 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5793 NamespcName->isStr("std")) { 5794 Diag(IdentLoc, diag::ext_using_undefined_std); 5795 R.addDecl(getOrCreateStdNamespace()); 5796 R.resolveKind(); 5797 } 5798 // Otherwise, attempt typo correction. 5799 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5800 } 5801 5802 if (!R.empty()) { 5803 NamedDecl *Named = R.getFoundDecl(); 5804 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5805 && "expected namespace decl"); 5806 // C++ [namespace.udir]p1: 5807 // A using-directive specifies that the names in the nominated 5808 // namespace can be used in the scope in which the 5809 // using-directive appears after the using-directive. During 5810 // unqualified name lookup (3.4.1), the names appear as if they 5811 // were declared in the nearest enclosing namespace which 5812 // contains both the using-directive and the nominated 5813 // namespace. [Note: in this context, "contains" means "contains 5814 // directly or indirectly". ] 5815 5816 // Find enclosing context containing both using-directive and 5817 // nominated namespace. 5818 NamespaceDecl *NS = getNamespaceDecl(Named); 5819 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5820 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5821 CommonAncestor = CommonAncestor->getParent(); 5822 5823 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5824 SS.getWithLocInContext(Context), 5825 IdentLoc, Named, CommonAncestor); 5826 5827 if (IsUsingDirectiveInToplevelContext(CurContext) && 5828 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5829 Diag(IdentLoc, diag::warn_using_directive_in_header); 5830 } 5831 5832 PushUsingDirective(S, UDir); 5833 } else { 5834 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5835 } 5836 5837 // FIXME: We ignore attributes for now. 5838 return UDir; 5839} 5840 5841void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5842 // If the scope has an associated entity and the using directive is at 5843 // namespace or translation unit scope, add the UsingDirectiveDecl into 5844 // its lookup structure so qualified name lookup can find it. 5845 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()); 5846 if (Ctx && !Ctx->isFunctionOrMethod()) 5847 Ctx->addDecl(UDir); 5848 else 5849 // Otherwise, it is at block sope. The using-directives will affect lookup 5850 // only to the end of the scope. 5851 S->PushUsingDirective(UDir); 5852} 5853 5854 5855Decl *Sema::ActOnUsingDeclaration(Scope *S, 5856 AccessSpecifier AS, 5857 bool HasUsingKeyword, 5858 SourceLocation UsingLoc, 5859 CXXScopeSpec &SS, 5860 UnqualifiedId &Name, 5861 AttributeList *AttrList, 5862 bool IsTypeName, 5863 SourceLocation TypenameLoc) { 5864 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5865 5866 switch (Name.getKind()) { 5867 case UnqualifiedId::IK_ImplicitSelfParam: 5868 case UnqualifiedId::IK_Identifier: 5869 case UnqualifiedId::IK_OperatorFunctionId: 5870 case UnqualifiedId::IK_LiteralOperatorId: 5871 case UnqualifiedId::IK_ConversionFunctionId: 5872 break; 5873 5874 case UnqualifiedId::IK_ConstructorName: 5875 case UnqualifiedId::IK_ConstructorTemplateId: 5876 // C++0x inherited constructors. 5877 Diag(Name.getLocStart(), 5878 getLangOpts().CPlusPlus0x ? 5879 diag::warn_cxx98_compat_using_decl_constructor : 5880 diag::err_using_decl_constructor) 5881 << SS.getRange(); 5882 5883 if (getLangOpts().CPlusPlus0x) break; 5884 5885 return 0; 5886 5887 case UnqualifiedId::IK_DestructorName: 5888 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 5889 << SS.getRange(); 5890 return 0; 5891 5892 case UnqualifiedId::IK_TemplateId: 5893 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 5894 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5895 return 0; 5896 } 5897 5898 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5899 DeclarationName TargetName = TargetNameInfo.getName(); 5900 if (!TargetName) 5901 return 0; 5902 5903 // Warn about using declarations. 5904 // TODO: store that the declaration was written without 'using' and 5905 // talk about access decls instead of using decls in the 5906 // diagnostics. 5907 if (!HasUsingKeyword) { 5908 UsingLoc = Name.getLocStart(); 5909 5910 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5911 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5912 } 5913 5914 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5915 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5916 return 0; 5917 5918 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5919 TargetNameInfo, AttrList, 5920 /* IsInstantiation */ false, 5921 IsTypeName, TypenameLoc); 5922 if (UD) 5923 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5924 5925 return UD; 5926} 5927 5928/// \brief Determine whether a using declaration considers the given 5929/// declarations as "equivalent", e.g., if they are redeclarations of 5930/// the same entity or are both typedefs of the same type. 5931static bool 5932IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5933 bool &SuppressRedeclaration) { 5934 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5935 SuppressRedeclaration = false; 5936 return true; 5937 } 5938 5939 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5940 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5941 SuppressRedeclaration = true; 5942 return Context.hasSameType(TD1->getUnderlyingType(), 5943 TD2->getUnderlyingType()); 5944 } 5945 5946 return false; 5947} 5948 5949 5950/// Determines whether to create a using shadow decl for a particular 5951/// decl, given the set of decls existing prior to this using lookup. 5952bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5953 const LookupResult &Previous) { 5954 // Diagnose finding a decl which is not from a base class of the 5955 // current class. We do this now because there are cases where this 5956 // function will silently decide not to build a shadow decl, which 5957 // will pre-empt further diagnostics. 5958 // 5959 // We don't need to do this in C++0x because we do the check once on 5960 // the qualifier. 5961 // 5962 // FIXME: diagnose the following if we care enough: 5963 // struct A { int foo; }; 5964 // struct B : A { using A::foo; }; 5965 // template <class T> struct C : A {}; 5966 // template <class T> struct D : C<T> { using B::foo; } // <--- 5967 // This is invalid (during instantiation) in C++03 because B::foo 5968 // resolves to the using decl in B, which is not a base class of D<T>. 5969 // We can't diagnose it immediately because C<T> is an unknown 5970 // specialization. The UsingShadowDecl in D<T> then points directly 5971 // to A::foo, which will look well-formed when we instantiate. 5972 // The right solution is to not collapse the shadow-decl chain. 5973 if (!getLangOpts().CPlusPlus0x && CurContext->isRecord()) { 5974 DeclContext *OrigDC = Orig->getDeclContext(); 5975 5976 // Handle enums and anonymous structs. 5977 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5978 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5979 while (OrigRec->isAnonymousStructOrUnion()) 5980 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5981 5982 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5983 if (OrigDC == CurContext) { 5984 Diag(Using->getLocation(), 5985 diag::err_using_decl_nested_name_specifier_is_current_class) 5986 << Using->getQualifierLoc().getSourceRange(); 5987 Diag(Orig->getLocation(), diag::note_using_decl_target); 5988 return true; 5989 } 5990 5991 Diag(Using->getQualifierLoc().getBeginLoc(), 5992 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5993 << Using->getQualifier() 5994 << cast<CXXRecordDecl>(CurContext) 5995 << Using->getQualifierLoc().getSourceRange(); 5996 Diag(Orig->getLocation(), diag::note_using_decl_target); 5997 return true; 5998 } 5999 } 6000 6001 if (Previous.empty()) return false; 6002 6003 NamedDecl *Target = Orig; 6004 if (isa<UsingShadowDecl>(Target)) 6005 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6006 6007 // If the target happens to be one of the previous declarations, we 6008 // don't have a conflict. 6009 // 6010 // FIXME: but we might be increasing its access, in which case we 6011 // should redeclare it. 6012 NamedDecl *NonTag = 0, *Tag = 0; 6013 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 6014 I != E; ++I) { 6015 NamedDecl *D = (*I)->getUnderlyingDecl(); 6016 bool Result; 6017 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 6018 return Result; 6019 6020 (isa<TagDecl>(D) ? Tag : NonTag) = D; 6021 } 6022 6023 if (Target->isFunctionOrFunctionTemplate()) { 6024 FunctionDecl *FD; 6025 if (isa<FunctionTemplateDecl>(Target)) 6026 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6027 else 6028 FD = cast<FunctionDecl>(Target); 6029 6030 NamedDecl *OldDecl = 0; 6031 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6032 case Ovl_Overload: 6033 return false; 6034 6035 case Ovl_NonFunction: 6036 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6037 break; 6038 6039 // We found a decl with the exact signature. 6040 case Ovl_Match: 6041 // If we're in a record, we want to hide the target, so we 6042 // return true (without a diagnostic) to tell the caller not to 6043 // build a shadow decl. 6044 if (CurContext->isRecord()) 6045 return true; 6046 6047 // If we're not in a record, this is an error. 6048 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6049 break; 6050 } 6051 6052 Diag(Target->getLocation(), diag::note_using_decl_target); 6053 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6054 return true; 6055 } 6056 6057 // Target is not a function. 6058 6059 if (isa<TagDecl>(Target)) { 6060 // No conflict between a tag and a non-tag. 6061 if (!Tag) return false; 6062 6063 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6064 Diag(Target->getLocation(), diag::note_using_decl_target); 6065 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6066 return true; 6067 } 6068 6069 // No conflict between a tag and a non-tag. 6070 if (!NonTag) return false; 6071 6072 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6073 Diag(Target->getLocation(), diag::note_using_decl_target); 6074 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6075 return true; 6076} 6077 6078/// Builds a shadow declaration corresponding to a 'using' declaration. 6079UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6080 UsingDecl *UD, 6081 NamedDecl *Orig) { 6082 6083 // If we resolved to another shadow declaration, just coalesce them. 6084 NamedDecl *Target = Orig; 6085 if (isa<UsingShadowDecl>(Target)) { 6086 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6087 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6088 } 6089 6090 UsingShadowDecl *Shadow 6091 = UsingShadowDecl::Create(Context, CurContext, 6092 UD->getLocation(), UD, Target); 6093 UD->addShadowDecl(Shadow); 6094 6095 Shadow->setAccess(UD->getAccess()); 6096 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6097 Shadow->setInvalidDecl(); 6098 6099 if (S) 6100 PushOnScopeChains(Shadow, S); 6101 else 6102 CurContext->addDecl(Shadow); 6103 6104 6105 return Shadow; 6106} 6107 6108/// Hides a using shadow declaration. This is required by the current 6109/// using-decl implementation when a resolvable using declaration in a 6110/// class is followed by a declaration which would hide or override 6111/// one or more of the using decl's targets; for example: 6112/// 6113/// struct Base { void foo(int); }; 6114/// struct Derived : Base { 6115/// using Base::foo; 6116/// void foo(int); 6117/// }; 6118/// 6119/// The governing language is C++03 [namespace.udecl]p12: 6120/// 6121/// When a using-declaration brings names from a base class into a 6122/// derived class scope, member functions in the derived class 6123/// override and/or hide member functions with the same name and 6124/// parameter types in a base class (rather than conflicting). 6125/// 6126/// There are two ways to implement this: 6127/// (1) optimistically create shadow decls when they're not hidden 6128/// by existing declarations, or 6129/// (2) don't create any shadow decls (or at least don't make them 6130/// visible) until we've fully parsed/instantiated the class. 6131/// The problem with (1) is that we might have to retroactively remove 6132/// a shadow decl, which requires several O(n) operations because the 6133/// decl structures are (very reasonably) not designed for removal. 6134/// (2) avoids this but is very fiddly and phase-dependent. 6135void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6136 if (Shadow->getDeclName().getNameKind() == 6137 DeclarationName::CXXConversionFunctionName) 6138 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6139 6140 // Remove it from the DeclContext... 6141 Shadow->getDeclContext()->removeDecl(Shadow); 6142 6143 // ...and the scope, if applicable... 6144 if (S) { 6145 S->RemoveDecl(Shadow); 6146 IdResolver.RemoveDecl(Shadow); 6147 } 6148 6149 // ...and the using decl. 6150 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6151 6152 // TODO: complain somehow if Shadow was used. It shouldn't 6153 // be possible for this to happen, because...? 6154} 6155 6156/// Builds a using declaration. 6157/// 6158/// \param IsInstantiation - Whether this call arises from an 6159/// instantiation of an unresolved using declaration. We treat 6160/// the lookup differently for these declarations. 6161NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6162 SourceLocation UsingLoc, 6163 CXXScopeSpec &SS, 6164 const DeclarationNameInfo &NameInfo, 6165 AttributeList *AttrList, 6166 bool IsInstantiation, 6167 bool IsTypeName, 6168 SourceLocation TypenameLoc) { 6169 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6170 SourceLocation IdentLoc = NameInfo.getLoc(); 6171 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6172 6173 // FIXME: We ignore attributes for now. 6174 6175 if (SS.isEmpty()) { 6176 Diag(IdentLoc, diag::err_using_requires_qualname); 6177 return 0; 6178 } 6179 6180 // Do the redeclaration lookup in the current scope. 6181 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6182 ForRedeclaration); 6183 Previous.setHideTags(false); 6184 if (S) { 6185 LookupName(Previous, S); 6186 6187 // It is really dumb that we have to do this. 6188 LookupResult::Filter F = Previous.makeFilter(); 6189 while (F.hasNext()) { 6190 NamedDecl *D = F.next(); 6191 if (!isDeclInScope(D, CurContext, S)) 6192 F.erase(); 6193 } 6194 F.done(); 6195 } else { 6196 assert(IsInstantiation && "no scope in non-instantiation"); 6197 assert(CurContext->isRecord() && "scope not record in instantiation"); 6198 LookupQualifiedName(Previous, CurContext); 6199 } 6200 6201 // Check for invalid redeclarations. 6202 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6203 return 0; 6204 6205 // Check for bad qualifiers. 6206 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6207 return 0; 6208 6209 DeclContext *LookupContext = computeDeclContext(SS); 6210 NamedDecl *D; 6211 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6212 if (!LookupContext) { 6213 if (IsTypeName) { 6214 // FIXME: not all declaration name kinds are legal here 6215 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6216 UsingLoc, TypenameLoc, 6217 QualifierLoc, 6218 IdentLoc, NameInfo.getName()); 6219 } else { 6220 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6221 QualifierLoc, NameInfo); 6222 } 6223 } else { 6224 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6225 NameInfo, IsTypeName); 6226 } 6227 D->setAccess(AS); 6228 CurContext->addDecl(D); 6229 6230 if (!LookupContext) return D; 6231 UsingDecl *UD = cast<UsingDecl>(D); 6232 6233 if (RequireCompleteDeclContext(SS, LookupContext)) { 6234 UD->setInvalidDecl(); 6235 return UD; 6236 } 6237 6238 // Constructor inheriting using decls get special treatment. 6239 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6240 if (CheckInheritedConstructorUsingDecl(UD)) 6241 UD->setInvalidDecl(); 6242 return UD; 6243 } 6244 6245 // Otherwise, look up the target name. 6246 6247 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6248 6249 // Unlike most lookups, we don't always want to hide tag 6250 // declarations: tag names are visible through the using declaration 6251 // even if hidden by ordinary names, *except* in a dependent context 6252 // where it's important for the sanity of two-phase lookup. 6253 if (!IsInstantiation) 6254 R.setHideTags(false); 6255 6256 LookupQualifiedName(R, LookupContext); 6257 6258 if (R.empty()) { 6259 Diag(IdentLoc, diag::err_no_member) 6260 << NameInfo.getName() << LookupContext << SS.getRange(); 6261 UD->setInvalidDecl(); 6262 return UD; 6263 } 6264 6265 if (R.isAmbiguous()) { 6266 UD->setInvalidDecl(); 6267 return UD; 6268 } 6269 6270 if (IsTypeName) { 6271 // If we asked for a typename and got a non-type decl, error out. 6272 if (!R.getAsSingle<TypeDecl>()) { 6273 Diag(IdentLoc, diag::err_using_typename_non_type); 6274 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6275 Diag((*I)->getUnderlyingDecl()->getLocation(), 6276 diag::note_using_decl_target); 6277 UD->setInvalidDecl(); 6278 return UD; 6279 } 6280 } else { 6281 // If we asked for a non-typename and we got a type, error out, 6282 // but only if this is an instantiation of an unresolved using 6283 // decl. Otherwise just silently find the type name. 6284 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6285 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6286 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6287 UD->setInvalidDecl(); 6288 return UD; 6289 } 6290 } 6291 6292 // C++0x N2914 [namespace.udecl]p6: 6293 // A using-declaration shall not name a namespace. 6294 if (R.getAsSingle<NamespaceDecl>()) { 6295 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6296 << SS.getRange(); 6297 UD->setInvalidDecl(); 6298 return UD; 6299 } 6300 6301 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6302 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6303 BuildUsingShadowDecl(S, UD, *I); 6304 } 6305 6306 return UD; 6307} 6308 6309/// Additional checks for a using declaration referring to a constructor name. 6310bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 6311 if (UD->isTypeName()) { 6312 // FIXME: Cannot specify typename when specifying constructor 6313 return true; 6314 } 6315 6316 const Type *SourceType = UD->getQualifier()->getAsType(); 6317 assert(SourceType && 6318 "Using decl naming constructor doesn't have type in scope spec."); 6319 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6320 6321 // Check whether the named type is a direct base class. 6322 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6323 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6324 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6325 BaseIt != BaseE; ++BaseIt) { 6326 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6327 if (CanonicalSourceType == BaseType) 6328 break; 6329 } 6330 6331 if (BaseIt == BaseE) { 6332 // Did not find SourceType in the bases. 6333 Diag(UD->getUsingLocation(), 6334 diag::err_using_decl_constructor_not_in_direct_base) 6335 << UD->getNameInfo().getSourceRange() 6336 << QualType(SourceType, 0) << TargetClass; 6337 return true; 6338 } 6339 6340 BaseIt->setInheritConstructors(); 6341 6342 return false; 6343} 6344 6345/// Checks that the given using declaration is not an invalid 6346/// redeclaration. Note that this is checking only for the using decl 6347/// itself, not for any ill-formedness among the UsingShadowDecls. 6348bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6349 bool isTypeName, 6350 const CXXScopeSpec &SS, 6351 SourceLocation NameLoc, 6352 const LookupResult &Prev) { 6353 // C++03 [namespace.udecl]p8: 6354 // C++0x [namespace.udecl]p10: 6355 // A using-declaration is a declaration and can therefore be used 6356 // repeatedly where (and only where) multiple declarations are 6357 // allowed. 6358 // 6359 // That's in non-member contexts. 6360 if (!CurContext->getRedeclContext()->isRecord()) 6361 return false; 6362 6363 NestedNameSpecifier *Qual 6364 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6365 6366 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6367 NamedDecl *D = *I; 6368 6369 bool DTypename; 6370 NestedNameSpecifier *DQual; 6371 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6372 DTypename = UD->isTypeName(); 6373 DQual = UD->getQualifier(); 6374 } else if (UnresolvedUsingValueDecl *UD 6375 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6376 DTypename = false; 6377 DQual = UD->getQualifier(); 6378 } else if (UnresolvedUsingTypenameDecl *UD 6379 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6380 DTypename = true; 6381 DQual = UD->getQualifier(); 6382 } else continue; 6383 6384 // using decls differ if one says 'typename' and the other doesn't. 6385 // FIXME: non-dependent using decls? 6386 if (isTypeName != DTypename) continue; 6387 6388 // using decls differ if they name different scopes (but note that 6389 // template instantiation can cause this check to trigger when it 6390 // didn't before instantiation). 6391 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6392 Context.getCanonicalNestedNameSpecifier(DQual)) 6393 continue; 6394 6395 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6396 Diag(D->getLocation(), diag::note_using_decl) << 1; 6397 return true; 6398 } 6399 6400 return false; 6401} 6402 6403 6404/// Checks that the given nested-name qualifier used in a using decl 6405/// in the current context is appropriately related to the current 6406/// scope. If an error is found, diagnoses it and returns true. 6407bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6408 const CXXScopeSpec &SS, 6409 SourceLocation NameLoc) { 6410 DeclContext *NamedContext = computeDeclContext(SS); 6411 6412 if (!CurContext->isRecord()) { 6413 // C++03 [namespace.udecl]p3: 6414 // C++0x [namespace.udecl]p8: 6415 // A using-declaration for a class member shall be a member-declaration. 6416 6417 // If we weren't able to compute a valid scope, it must be a 6418 // dependent class scope. 6419 if (!NamedContext || NamedContext->isRecord()) { 6420 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6421 << SS.getRange(); 6422 return true; 6423 } 6424 6425 // Otherwise, everything is known to be fine. 6426 return false; 6427 } 6428 6429 // The current scope is a record. 6430 6431 // If the named context is dependent, we can't decide much. 6432 if (!NamedContext) { 6433 // FIXME: in C++0x, we can diagnose if we can prove that the 6434 // nested-name-specifier does not refer to a base class, which is 6435 // still possible in some cases. 6436 6437 // Otherwise we have to conservatively report that things might be 6438 // okay. 6439 return false; 6440 } 6441 6442 if (!NamedContext->isRecord()) { 6443 // Ideally this would point at the last name in the specifier, 6444 // but we don't have that level of source info. 6445 Diag(SS.getRange().getBegin(), 6446 diag::err_using_decl_nested_name_specifier_is_not_class) 6447 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6448 return true; 6449 } 6450 6451 if (!NamedContext->isDependentContext() && 6452 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6453 return true; 6454 6455 if (getLangOpts().CPlusPlus0x) { 6456 // C++0x [namespace.udecl]p3: 6457 // In a using-declaration used as a member-declaration, the 6458 // nested-name-specifier shall name a base class of the class 6459 // being defined. 6460 6461 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6462 cast<CXXRecordDecl>(NamedContext))) { 6463 if (CurContext == NamedContext) { 6464 Diag(NameLoc, 6465 diag::err_using_decl_nested_name_specifier_is_current_class) 6466 << SS.getRange(); 6467 return true; 6468 } 6469 6470 Diag(SS.getRange().getBegin(), 6471 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6472 << (NestedNameSpecifier*) SS.getScopeRep() 6473 << cast<CXXRecordDecl>(CurContext) 6474 << SS.getRange(); 6475 return true; 6476 } 6477 6478 return false; 6479 } 6480 6481 // C++03 [namespace.udecl]p4: 6482 // A using-declaration used as a member-declaration shall refer 6483 // to a member of a base class of the class being defined [etc.]. 6484 6485 // Salient point: SS doesn't have to name a base class as long as 6486 // lookup only finds members from base classes. Therefore we can 6487 // diagnose here only if we can prove that that can't happen, 6488 // i.e. if the class hierarchies provably don't intersect. 6489 6490 // TODO: it would be nice if "definitely valid" results were cached 6491 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6492 // need to be repeated. 6493 6494 struct UserData { 6495 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 6496 6497 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6498 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6499 Data->Bases.insert(Base); 6500 return true; 6501 } 6502 6503 bool hasDependentBases(const CXXRecordDecl *Class) { 6504 return !Class->forallBases(collect, this); 6505 } 6506 6507 /// Returns true if the base is dependent or is one of the 6508 /// accumulated base classes. 6509 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6510 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6511 return !Data->Bases.count(Base); 6512 } 6513 6514 bool mightShareBases(const CXXRecordDecl *Class) { 6515 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6516 } 6517 }; 6518 6519 UserData Data; 6520 6521 // Returns false if we find a dependent base. 6522 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6523 return false; 6524 6525 // Returns false if the class has a dependent base or if it or one 6526 // of its bases is present in the base set of the current context. 6527 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6528 return false; 6529 6530 Diag(SS.getRange().getBegin(), 6531 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6532 << (NestedNameSpecifier*) SS.getScopeRep() 6533 << cast<CXXRecordDecl>(CurContext) 6534 << SS.getRange(); 6535 6536 return true; 6537} 6538 6539Decl *Sema::ActOnAliasDeclaration(Scope *S, 6540 AccessSpecifier AS, 6541 MultiTemplateParamsArg TemplateParamLists, 6542 SourceLocation UsingLoc, 6543 UnqualifiedId &Name, 6544 TypeResult Type) { 6545 // Skip up to the relevant declaration scope. 6546 while (S->getFlags() & Scope::TemplateParamScope) 6547 S = S->getParent(); 6548 assert((S->getFlags() & Scope::DeclScope) && 6549 "got alias-declaration outside of declaration scope"); 6550 6551 if (Type.isInvalid()) 6552 return 0; 6553 6554 bool Invalid = false; 6555 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6556 TypeSourceInfo *TInfo = 0; 6557 GetTypeFromParser(Type.get(), &TInfo); 6558 6559 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6560 return 0; 6561 6562 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6563 UPPC_DeclarationType)) { 6564 Invalid = true; 6565 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6566 TInfo->getTypeLoc().getBeginLoc()); 6567 } 6568 6569 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6570 LookupName(Previous, S); 6571 6572 // Warn about shadowing the name of a template parameter. 6573 if (Previous.isSingleResult() && 6574 Previous.getFoundDecl()->isTemplateParameter()) { 6575 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6576 Previous.clear(); 6577 } 6578 6579 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6580 "name in alias declaration must be an identifier"); 6581 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6582 Name.StartLocation, 6583 Name.Identifier, TInfo); 6584 6585 NewTD->setAccess(AS); 6586 6587 if (Invalid) 6588 NewTD->setInvalidDecl(); 6589 6590 CheckTypedefForVariablyModifiedType(S, NewTD); 6591 Invalid |= NewTD->isInvalidDecl(); 6592 6593 bool Redeclaration = false; 6594 6595 NamedDecl *NewND; 6596 if (TemplateParamLists.size()) { 6597 TypeAliasTemplateDecl *OldDecl = 0; 6598 TemplateParameterList *OldTemplateParams = 0; 6599 6600 if (TemplateParamLists.size() != 1) { 6601 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6602 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6603 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6604 } 6605 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6606 6607 // Only consider previous declarations in the same scope. 6608 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6609 /*ExplicitInstantiationOrSpecialization*/false); 6610 if (!Previous.empty()) { 6611 Redeclaration = true; 6612 6613 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6614 if (!OldDecl && !Invalid) { 6615 Diag(UsingLoc, diag::err_redefinition_different_kind) 6616 << Name.Identifier; 6617 6618 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6619 if (OldD->getLocation().isValid()) 6620 Diag(OldD->getLocation(), diag::note_previous_definition); 6621 6622 Invalid = true; 6623 } 6624 6625 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6626 if (TemplateParameterListsAreEqual(TemplateParams, 6627 OldDecl->getTemplateParameters(), 6628 /*Complain=*/true, 6629 TPL_TemplateMatch)) 6630 OldTemplateParams = OldDecl->getTemplateParameters(); 6631 else 6632 Invalid = true; 6633 6634 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6635 if (!Invalid && 6636 !Context.hasSameType(OldTD->getUnderlyingType(), 6637 NewTD->getUnderlyingType())) { 6638 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6639 // but we can't reasonably accept it. 6640 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6641 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6642 if (OldTD->getLocation().isValid()) 6643 Diag(OldTD->getLocation(), diag::note_previous_definition); 6644 Invalid = true; 6645 } 6646 } 6647 } 6648 6649 // Merge any previous default template arguments into our parameters, 6650 // and check the parameter list. 6651 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6652 TPC_TypeAliasTemplate)) 6653 return 0; 6654 6655 TypeAliasTemplateDecl *NewDecl = 6656 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6657 Name.Identifier, TemplateParams, 6658 NewTD); 6659 6660 NewDecl->setAccess(AS); 6661 6662 if (Invalid) 6663 NewDecl->setInvalidDecl(); 6664 else if (OldDecl) 6665 NewDecl->setPreviousDeclaration(OldDecl); 6666 6667 NewND = NewDecl; 6668 } else { 6669 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6670 NewND = NewTD; 6671 } 6672 6673 if (!Redeclaration) 6674 PushOnScopeChains(NewND, S); 6675 6676 return NewND; 6677} 6678 6679Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6680 SourceLocation NamespaceLoc, 6681 SourceLocation AliasLoc, 6682 IdentifierInfo *Alias, 6683 CXXScopeSpec &SS, 6684 SourceLocation IdentLoc, 6685 IdentifierInfo *Ident) { 6686 6687 // Lookup the namespace name. 6688 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6689 LookupParsedName(R, S, &SS); 6690 6691 // Check if we have a previous declaration with the same name. 6692 NamedDecl *PrevDecl 6693 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6694 ForRedeclaration); 6695 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6696 PrevDecl = 0; 6697 6698 if (PrevDecl) { 6699 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6700 // We already have an alias with the same name that points to the same 6701 // namespace, so don't create a new one. 6702 // FIXME: At some point, we'll want to create the (redundant) 6703 // declaration to maintain better source information. 6704 if (!R.isAmbiguous() && !R.empty() && 6705 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6706 return 0; 6707 } 6708 6709 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6710 diag::err_redefinition_different_kind; 6711 Diag(AliasLoc, DiagID) << Alias; 6712 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6713 return 0; 6714 } 6715 6716 if (R.isAmbiguous()) 6717 return 0; 6718 6719 if (R.empty()) { 6720 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6721 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 6722 return 0; 6723 } 6724 } 6725 6726 NamespaceAliasDecl *AliasDecl = 6727 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6728 Alias, SS.getWithLocInContext(Context), 6729 IdentLoc, R.getFoundDecl()); 6730 6731 PushOnScopeChains(AliasDecl, S); 6732 return AliasDecl; 6733} 6734 6735namespace { 6736 /// \brief Scoped object used to handle the state changes required in Sema 6737 /// to implicitly define the body of a C++ member function; 6738 class ImplicitlyDefinedFunctionScope { 6739 Sema &S; 6740 Sema::ContextRAII SavedContext; 6741 6742 public: 6743 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6744 : S(S), SavedContext(S, Method) 6745 { 6746 S.PushFunctionScope(); 6747 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6748 } 6749 6750 ~ImplicitlyDefinedFunctionScope() { 6751 S.PopExpressionEvaluationContext(); 6752 S.PopFunctionScopeInfo(); 6753 } 6754 }; 6755} 6756 6757Sema::ImplicitExceptionSpecification 6758Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6759 // C++ [except.spec]p14: 6760 // An implicitly declared special member function (Clause 12) shall have an 6761 // exception-specification. [...] 6762 ImplicitExceptionSpecification ExceptSpec(Context); 6763 if (ClassDecl->isInvalidDecl()) 6764 return ExceptSpec; 6765 6766 // Direct base-class constructors. 6767 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6768 BEnd = ClassDecl->bases_end(); 6769 B != BEnd; ++B) { 6770 if (B->isVirtual()) // Handled below. 6771 continue; 6772 6773 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6774 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6775 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6776 // If this is a deleted function, add it anyway. This might be conformant 6777 // with the standard. This might not. I'm not sure. It might not matter. 6778 if (Constructor) 6779 ExceptSpec.CalledDecl(Constructor); 6780 } 6781 } 6782 6783 // Virtual base-class constructors. 6784 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6785 BEnd = ClassDecl->vbases_end(); 6786 B != BEnd; ++B) { 6787 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6788 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6789 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6790 // If this is a deleted function, add it anyway. This might be conformant 6791 // with the standard. This might not. I'm not sure. It might not matter. 6792 if (Constructor) 6793 ExceptSpec.CalledDecl(Constructor); 6794 } 6795 } 6796 6797 // Field constructors. 6798 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6799 FEnd = ClassDecl->field_end(); 6800 F != FEnd; ++F) { 6801 if (F->hasInClassInitializer()) { 6802 if (Expr *E = F->getInClassInitializer()) 6803 ExceptSpec.CalledExpr(E); 6804 else if (!F->isInvalidDecl()) 6805 ExceptSpec.SetDelayed(); 6806 } else if (const RecordType *RecordTy 6807 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6808 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6809 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6810 // If this is a deleted function, add it anyway. This might be conformant 6811 // with the standard. This might not. I'm not sure. It might not matter. 6812 // In particular, the problem is that this function never gets called. It 6813 // might just be ill-formed because this function attempts to refer to 6814 // a deleted function here. 6815 if (Constructor) 6816 ExceptSpec.CalledDecl(Constructor); 6817 } 6818 } 6819 6820 return ExceptSpec; 6821} 6822 6823CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6824 CXXRecordDecl *ClassDecl) { 6825 // C++ [class.ctor]p5: 6826 // A default constructor for a class X is a constructor of class X 6827 // that can be called without an argument. If there is no 6828 // user-declared constructor for class X, a default constructor is 6829 // implicitly declared. An implicitly-declared default constructor 6830 // is an inline public member of its class. 6831 assert(!ClassDecl->hasUserDeclaredConstructor() && 6832 "Should not build implicit default constructor!"); 6833 6834 ImplicitExceptionSpecification Spec = 6835 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6836 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6837 6838 // Create the actual constructor declaration. 6839 CanQualType ClassType 6840 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6841 SourceLocation ClassLoc = ClassDecl->getLocation(); 6842 DeclarationName Name 6843 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6844 DeclarationNameInfo NameInfo(Name, ClassLoc); 6845 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 6846 Context, ClassDecl, ClassLoc, NameInfo, 6847 Context.getFunctionType(Context.VoidTy, 0, 0, EPI), /*TInfo=*/0, 6848 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 6849 /*isConstexpr=*/ClassDecl->defaultedDefaultConstructorIsConstexpr() && 6850 getLangOpts().CPlusPlus0x); 6851 DefaultCon->setAccess(AS_public); 6852 DefaultCon->setDefaulted(); 6853 DefaultCon->setImplicit(); 6854 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6855 6856 // Note that we have declared this constructor. 6857 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6858 6859 if (Scope *S = getScopeForContext(ClassDecl)) 6860 PushOnScopeChains(DefaultCon, S, false); 6861 ClassDecl->addDecl(DefaultCon); 6862 6863 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6864 DefaultCon->setDeletedAsWritten(); 6865 6866 return DefaultCon; 6867} 6868 6869void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6870 CXXConstructorDecl *Constructor) { 6871 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6872 !Constructor->doesThisDeclarationHaveABody() && 6873 !Constructor->isDeleted()) && 6874 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6875 6876 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6877 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6878 6879 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6880 DiagnosticErrorTrap Trap(Diags); 6881 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6882 Trap.hasErrorOccurred()) { 6883 Diag(CurrentLocation, diag::note_member_synthesized_at) 6884 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6885 Constructor->setInvalidDecl(); 6886 return; 6887 } 6888 6889 SourceLocation Loc = Constructor->getLocation(); 6890 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6891 6892 Constructor->setUsed(); 6893 MarkVTableUsed(CurrentLocation, ClassDecl); 6894 6895 if (ASTMutationListener *L = getASTMutationListener()) { 6896 L->CompletedImplicitDefinition(Constructor); 6897 } 6898} 6899 6900/// Get any existing defaulted default constructor for the given class. Do not 6901/// implicitly define one if it does not exist. 6902static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6903 CXXRecordDecl *D) { 6904 ASTContext &Context = Self.Context; 6905 QualType ClassType = Context.getTypeDeclType(D); 6906 DeclarationName ConstructorName 6907 = Context.DeclarationNames.getCXXConstructorName( 6908 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6909 6910 DeclContext::lookup_const_iterator Con, ConEnd; 6911 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6912 Con != ConEnd; ++Con) { 6913 // A function template cannot be defaulted. 6914 if (isa<FunctionTemplateDecl>(*Con)) 6915 continue; 6916 6917 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6918 if (Constructor->isDefaultConstructor()) 6919 return Constructor->isDefaulted() ? Constructor : 0; 6920 } 6921 return 0; 6922} 6923 6924void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6925 if (!D) return; 6926 AdjustDeclIfTemplate(D); 6927 6928 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6929 CXXConstructorDecl *CtorDecl 6930 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6931 6932 if (!CtorDecl) return; 6933 6934 // Compute the exception specification for the default constructor. 6935 const FunctionProtoType *CtorTy = 6936 CtorDecl->getType()->castAs<FunctionProtoType>(); 6937 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6938 ImplicitExceptionSpecification Spec = 6939 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6940 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6941 assert(EPI.ExceptionSpecType != EST_Delayed); 6942 6943 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6944 } 6945 6946 // If the default constructor is explicitly defaulted, checking the exception 6947 // specification is deferred until now. 6948 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 6949 !ClassDecl->isDependentType()) 6950 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 6951} 6952 6953void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6954 // We start with an initial pass over the base classes to collect those that 6955 // inherit constructors from. If there are none, we can forgo all further 6956 // processing. 6957 typedef SmallVector<const RecordType *, 4> BasesVector; 6958 BasesVector BasesToInheritFrom; 6959 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6960 BaseE = ClassDecl->bases_end(); 6961 BaseIt != BaseE; ++BaseIt) { 6962 if (BaseIt->getInheritConstructors()) { 6963 QualType Base = BaseIt->getType(); 6964 if (Base->isDependentType()) { 6965 // If we inherit constructors from anything that is dependent, just 6966 // abort processing altogether. We'll get another chance for the 6967 // instantiations. 6968 return; 6969 } 6970 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6971 } 6972 } 6973 if (BasesToInheritFrom.empty()) 6974 return; 6975 6976 // Now collect the constructors that we already have in the current class. 6977 // Those take precedence over inherited constructors. 6978 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6979 // unless there is a user-declared constructor with the same signature in 6980 // the class where the using-declaration appears. 6981 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6982 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6983 CtorE = ClassDecl->ctor_end(); 6984 CtorIt != CtorE; ++CtorIt) { 6985 ExistingConstructors.insert( 6986 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6987 } 6988 6989 Scope *S = getScopeForContext(ClassDecl); 6990 DeclarationName CreatedCtorName = 6991 Context.DeclarationNames.getCXXConstructorName( 6992 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6993 6994 // Now comes the true work. 6995 // First, we keep a map from constructor types to the base that introduced 6996 // them. Needed for finding conflicting constructors. We also keep the 6997 // actually inserted declarations in there, for pretty diagnostics. 6998 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6999 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 7000 ConstructorToSourceMap InheritedConstructors; 7001 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 7002 BaseE = BasesToInheritFrom.end(); 7003 BaseIt != BaseE; ++BaseIt) { 7004 const RecordType *Base = *BaseIt; 7005 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 7006 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 7007 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 7008 CtorE = BaseDecl->ctor_end(); 7009 CtorIt != CtorE; ++CtorIt) { 7010 // Find the using declaration for inheriting this base's constructors. 7011 DeclarationName Name = 7012 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 7013 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 7014 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 7015 SourceLocation UsingLoc = UD ? UD->getLocation() : 7016 ClassDecl->getLocation(); 7017 7018 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 7019 // from the class X named in the using-declaration consists of actual 7020 // constructors and notional constructors that result from the 7021 // transformation of defaulted parameters as follows: 7022 // - all non-template default constructors of X, and 7023 // - for each non-template constructor of X that has at least one 7024 // parameter with a default argument, the set of constructors that 7025 // results from omitting any ellipsis parameter specification and 7026 // successively omitting parameters with a default argument from the 7027 // end of the parameter-type-list. 7028 CXXConstructorDecl *BaseCtor = *CtorIt; 7029 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 7030 const FunctionProtoType *BaseCtorType = 7031 BaseCtor->getType()->getAs<FunctionProtoType>(); 7032 7033 for (unsigned params = BaseCtor->getMinRequiredArguments(), 7034 maxParams = BaseCtor->getNumParams(); 7035 params <= maxParams; ++params) { 7036 // Skip default constructors. They're never inherited. 7037 if (params == 0) 7038 continue; 7039 // Skip copy and move constructors for the same reason. 7040 if (CanBeCopyOrMove && params == 1) 7041 continue; 7042 7043 // Build up a function type for this particular constructor. 7044 // FIXME: The working paper does not consider that the exception spec 7045 // for the inheriting constructor might be larger than that of the 7046 // source. This code doesn't yet, either. When it does, this code will 7047 // need to be delayed until after exception specifications and in-class 7048 // member initializers are attached. 7049 const Type *NewCtorType; 7050 if (params == maxParams) 7051 NewCtorType = BaseCtorType; 7052 else { 7053 SmallVector<QualType, 16> Args; 7054 for (unsigned i = 0; i < params; ++i) { 7055 Args.push_back(BaseCtorType->getArgType(i)); 7056 } 7057 FunctionProtoType::ExtProtoInfo ExtInfo = 7058 BaseCtorType->getExtProtoInfo(); 7059 ExtInfo.Variadic = false; 7060 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7061 Args.data(), params, ExtInfo) 7062 .getTypePtr(); 7063 } 7064 const Type *CanonicalNewCtorType = 7065 Context.getCanonicalType(NewCtorType); 7066 7067 // Now that we have the type, first check if the class already has a 7068 // constructor with this signature. 7069 if (ExistingConstructors.count(CanonicalNewCtorType)) 7070 continue; 7071 7072 // Then we check if we have already declared an inherited constructor 7073 // with this signature. 7074 std::pair<ConstructorToSourceMap::iterator, bool> result = 7075 InheritedConstructors.insert(std::make_pair( 7076 CanonicalNewCtorType, 7077 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7078 if (!result.second) { 7079 // Already in the map. If it came from a different class, that's an 7080 // error. Not if it's from the same. 7081 CanQualType PreviousBase = result.first->second.first; 7082 if (CanonicalBase != PreviousBase) { 7083 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7084 const CXXConstructorDecl *PrevBaseCtor = 7085 PrevCtor->getInheritedConstructor(); 7086 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7087 7088 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7089 Diag(BaseCtor->getLocation(), 7090 diag::note_using_decl_constructor_conflict_current_ctor); 7091 Diag(PrevBaseCtor->getLocation(), 7092 diag::note_using_decl_constructor_conflict_previous_ctor); 7093 Diag(PrevCtor->getLocation(), 7094 diag::note_using_decl_constructor_conflict_previous_using); 7095 } 7096 continue; 7097 } 7098 7099 // OK, we're there, now add the constructor. 7100 // C++0x [class.inhctor]p8: [...] that would be performed by a 7101 // user-written inline constructor [...] 7102 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7103 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7104 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7105 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7106 /*ImplicitlyDeclared=*/true, 7107 // FIXME: Due to a defect in the standard, we treat inherited 7108 // constructors as constexpr even if that makes them ill-formed. 7109 /*Constexpr=*/BaseCtor->isConstexpr()); 7110 NewCtor->setAccess(BaseCtor->getAccess()); 7111 7112 // Build up the parameter decls and add them. 7113 SmallVector<ParmVarDecl *, 16> ParamDecls; 7114 for (unsigned i = 0; i < params; ++i) { 7115 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7116 UsingLoc, UsingLoc, 7117 /*IdentifierInfo=*/0, 7118 BaseCtorType->getArgType(i), 7119 /*TInfo=*/0, SC_None, 7120 SC_None, /*DefaultArg=*/0)); 7121 } 7122 NewCtor->setParams(ParamDecls); 7123 NewCtor->setInheritedConstructor(BaseCtor); 7124 7125 PushOnScopeChains(NewCtor, S, false); 7126 ClassDecl->addDecl(NewCtor); 7127 result.first->second.second = NewCtor; 7128 } 7129 } 7130 } 7131} 7132 7133Sema::ImplicitExceptionSpecification 7134Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7135 // C++ [except.spec]p14: 7136 // An implicitly declared special member function (Clause 12) shall have 7137 // an exception-specification. 7138 ImplicitExceptionSpecification ExceptSpec(Context); 7139 if (ClassDecl->isInvalidDecl()) 7140 return ExceptSpec; 7141 7142 // Direct base-class destructors. 7143 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7144 BEnd = ClassDecl->bases_end(); 7145 B != BEnd; ++B) { 7146 if (B->isVirtual()) // Handled below. 7147 continue; 7148 7149 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7150 ExceptSpec.CalledDecl( 7151 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7152 } 7153 7154 // Virtual base-class destructors. 7155 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7156 BEnd = ClassDecl->vbases_end(); 7157 B != BEnd; ++B) { 7158 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7159 ExceptSpec.CalledDecl( 7160 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7161 } 7162 7163 // Field destructors. 7164 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7165 FEnd = ClassDecl->field_end(); 7166 F != FEnd; ++F) { 7167 if (const RecordType *RecordTy 7168 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7169 ExceptSpec.CalledDecl( 7170 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7171 } 7172 7173 return ExceptSpec; 7174} 7175 7176CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7177 // C++ [class.dtor]p2: 7178 // If a class has no user-declared destructor, a destructor is 7179 // declared implicitly. An implicitly-declared destructor is an 7180 // inline public member of its class. 7181 7182 ImplicitExceptionSpecification Spec = 7183 ComputeDefaultedDtorExceptionSpec(ClassDecl); 7184 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7185 7186 // Create the actual destructor declaration. 7187 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 7188 7189 CanQualType ClassType 7190 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7191 SourceLocation ClassLoc = ClassDecl->getLocation(); 7192 DeclarationName Name 7193 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7194 DeclarationNameInfo NameInfo(Name, ClassLoc); 7195 CXXDestructorDecl *Destructor 7196 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 7197 /*isInline=*/true, 7198 /*isImplicitlyDeclared=*/true); 7199 Destructor->setAccess(AS_public); 7200 Destructor->setDefaulted(); 7201 Destructor->setImplicit(); 7202 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7203 7204 // Note that we have declared this destructor. 7205 ++ASTContext::NumImplicitDestructorsDeclared; 7206 7207 // Introduce this destructor into its scope. 7208 if (Scope *S = getScopeForContext(ClassDecl)) 7209 PushOnScopeChains(Destructor, S, false); 7210 ClassDecl->addDecl(Destructor); 7211 7212 // This could be uniqued if it ever proves significant. 7213 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 7214 7215 AddOverriddenMethods(ClassDecl, Destructor); 7216 7217 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 7218 Destructor->setDeletedAsWritten(); 7219 7220 return Destructor; 7221} 7222 7223void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7224 CXXDestructorDecl *Destructor) { 7225 assert((Destructor->isDefaulted() && 7226 !Destructor->doesThisDeclarationHaveABody() && 7227 !Destructor->isDeleted()) && 7228 "DefineImplicitDestructor - call it for implicit default dtor"); 7229 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7230 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7231 7232 if (Destructor->isInvalidDecl()) 7233 return; 7234 7235 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7236 7237 DiagnosticErrorTrap Trap(Diags); 7238 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7239 Destructor->getParent()); 7240 7241 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7242 Diag(CurrentLocation, diag::note_member_synthesized_at) 7243 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7244 7245 Destructor->setInvalidDecl(); 7246 return; 7247 } 7248 7249 SourceLocation Loc = Destructor->getLocation(); 7250 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7251 Destructor->setImplicitlyDefined(true); 7252 Destructor->setUsed(); 7253 MarkVTableUsed(CurrentLocation, ClassDecl); 7254 7255 if (ASTMutationListener *L = getASTMutationListener()) { 7256 L->CompletedImplicitDefinition(Destructor); 7257 } 7258} 7259 7260void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 7261 CXXDestructorDecl *destructor) { 7262 // C++11 [class.dtor]p3: 7263 // A declaration of a destructor that does not have an exception- 7264 // specification is implicitly considered to have the same exception- 7265 // specification as an implicit declaration. 7266 const FunctionProtoType *dtorType = destructor->getType()-> 7267 getAs<FunctionProtoType>(); 7268 if (dtorType->hasExceptionSpec()) 7269 return; 7270 7271 ImplicitExceptionSpecification exceptSpec = 7272 ComputeDefaultedDtorExceptionSpec(classDecl); 7273 7274 // Replace the destructor's type, building off the existing one. Fortunately, 7275 // the only thing of interest in the destructor type is its extended info. 7276 // The return and arguments are fixed. 7277 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 7278 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 7279 epi.NumExceptions = exceptSpec.size(); 7280 epi.Exceptions = exceptSpec.data(); 7281 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 7282 7283 destructor->setType(ty); 7284 7285 // FIXME: If the destructor has a body that could throw, and the newly created 7286 // spec doesn't allow exceptions, we should emit a warning, because this 7287 // change in behavior can break conforming C++03 programs at runtime. 7288 // However, we don't have a body yet, so it needs to be done somewhere else. 7289} 7290 7291/// \brief Builds a statement that copies/moves the given entity from \p From to 7292/// \c To. 7293/// 7294/// This routine is used to copy/move the members of a class with an 7295/// implicitly-declared copy/move assignment operator. When the entities being 7296/// copied are arrays, this routine builds for loops to copy them. 7297/// 7298/// \param S The Sema object used for type-checking. 7299/// 7300/// \param Loc The location where the implicit copy/move is being generated. 7301/// 7302/// \param T The type of the expressions being copied/moved. Both expressions 7303/// must have this type. 7304/// 7305/// \param To The expression we are copying/moving to. 7306/// 7307/// \param From The expression we are copying/moving from. 7308/// 7309/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7310/// Otherwise, it's a non-static member subobject. 7311/// 7312/// \param Copying Whether we're copying or moving. 7313/// 7314/// \param Depth Internal parameter recording the depth of the recursion. 7315/// 7316/// \returns A statement or a loop that copies the expressions. 7317static StmtResult 7318BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7319 Expr *To, Expr *From, 7320 bool CopyingBaseSubobject, bool Copying, 7321 unsigned Depth = 0) { 7322 // C++0x [class.copy]p28: 7323 // Each subobject is assigned in the manner appropriate to its type: 7324 // 7325 // - if the subobject is of class type, as if by a call to operator= with 7326 // the subobject as the object expression and the corresponding 7327 // subobject of x as a single function argument (as if by explicit 7328 // qualification; that is, ignoring any possible virtual overriding 7329 // functions in more derived classes); 7330 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7331 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7332 7333 // Look for operator=. 7334 DeclarationName Name 7335 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7336 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7337 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7338 7339 // Filter out any result that isn't a copy/move-assignment operator. 7340 LookupResult::Filter F = OpLookup.makeFilter(); 7341 while (F.hasNext()) { 7342 NamedDecl *D = F.next(); 7343 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7344 if (Copying ? Method->isCopyAssignmentOperator() : 7345 Method->isMoveAssignmentOperator()) 7346 continue; 7347 7348 F.erase(); 7349 } 7350 F.done(); 7351 7352 // Suppress the protected check (C++ [class.protected]) for each of the 7353 // assignment operators we found. This strange dance is required when 7354 // we're assigning via a base classes's copy-assignment operator. To 7355 // ensure that we're getting the right base class subobject (without 7356 // ambiguities), we need to cast "this" to that subobject type; to 7357 // ensure that we don't go through the virtual call mechanism, we need 7358 // to qualify the operator= name with the base class (see below). However, 7359 // this means that if the base class has a protected copy assignment 7360 // operator, the protected member access check will fail. So, we 7361 // rewrite "protected" access to "public" access in this case, since we 7362 // know by construction that we're calling from a derived class. 7363 if (CopyingBaseSubobject) { 7364 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7365 L != LEnd; ++L) { 7366 if (L.getAccess() == AS_protected) 7367 L.setAccess(AS_public); 7368 } 7369 } 7370 7371 // Create the nested-name-specifier that will be used to qualify the 7372 // reference to operator=; this is required to suppress the virtual 7373 // call mechanism. 7374 CXXScopeSpec SS; 7375 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 7376 SS.MakeTrivial(S.Context, 7377 NestedNameSpecifier::Create(S.Context, 0, false, 7378 CanonicalT), 7379 Loc); 7380 7381 // Create the reference to operator=. 7382 ExprResult OpEqualRef 7383 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7384 /*TemplateKWLoc=*/SourceLocation(), 7385 /*FirstQualifierInScope=*/0, 7386 OpLookup, 7387 /*TemplateArgs=*/0, 7388 /*SuppressQualifierCheck=*/true); 7389 if (OpEqualRef.isInvalid()) 7390 return StmtError(); 7391 7392 // Build the call to the assignment operator. 7393 7394 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7395 OpEqualRef.takeAs<Expr>(), 7396 Loc, &From, 1, Loc); 7397 if (Call.isInvalid()) 7398 return StmtError(); 7399 7400 return S.Owned(Call.takeAs<Stmt>()); 7401 } 7402 7403 // - if the subobject is of scalar type, the built-in assignment 7404 // operator is used. 7405 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7406 if (!ArrayTy) { 7407 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7408 if (Assignment.isInvalid()) 7409 return StmtError(); 7410 7411 return S.Owned(Assignment.takeAs<Stmt>()); 7412 } 7413 7414 // - if the subobject is an array, each element is assigned, in the 7415 // manner appropriate to the element type; 7416 7417 // Construct a loop over the array bounds, e.g., 7418 // 7419 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7420 // 7421 // that will copy each of the array elements. 7422 QualType SizeType = S.Context.getSizeType(); 7423 7424 // Create the iteration variable. 7425 IdentifierInfo *IterationVarName = 0; 7426 { 7427 SmallString<8> Str; 7428 llvm::raw_svector_ostream OS(Str); 7429 OS << "__i" << Depth; 7430 IterationVarName = &S.Context.Idents.get(OS.str()); 7431 } 7432 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7433 IterationVarName, SizeType, 7434 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7435 SC_None, SC_None); 7436 7437 // Initialize the iteration variable to zero. 7438 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7439 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7440 7441 // Create a reference to the iteration variable; we'll use this several 7442 // times throughout. 7443 Expr *IterationVarRef 7444 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 7445 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7446 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 7447 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 7448 7449 // Create the DeclStmt that holds the iteration variable. 7450 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7451 7452 // Create the comparison against the array bound. 7453 llvm::APInt Upper 7454 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7455 Expr *Comparison 7456 = new (S.Context) BinaryOperator(IterationVarRefRVal, 7457 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7458 BO_NE, S.Context.BoolTy, 7459 VK_RValue, OK_Ordinary, Loc); 7460 7461 // Create the pre-increment of the iteration variable. 7462 Expr *Increment 7463 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7464 VK_LValue, OK_Ordinary, Loc); 7465 7466 // Subscript the "from" and "to" expressions with the iteration variable. 7467 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7468 IterationVarRefRVal, 7469 Loc)); 7470 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7471 IterationVarRefRVal, 7472 Loc)); 7473 if (!Copying) // Cast to rvalue 7474 From = CastForMoving(S, From); 7475 7476 // Build the copy/move for an individual element of the array. 7477 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7478 To, From, CopyingBaseSubobject, 7479 Copying, Depth + 1); 7480 if (Copy.isInvalid()) 7481 return StmtError(); 7482 7483 // Construct the loop that copies all elements of this array. 7484 return S.ActOnForStmt(Loc, Loc, InitStmt, 7485 S.MakeFullExpr(Comparison), 7486 0, S.MakeFullExpr(Increment), 7487 Loc, Copy.take()); 7488} 7489 7490std::pair<Sema::ImplicitExceptionSpecification, bool> 7491Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7492 CXXRecordDecl *ClassDecl) { 7493 if (ClassDecl->isInvalidDecl()) 7494 return std::make_pair(ImplicitExceptionSpecification(Context), false); 7495 7496 // C++ [class.copy]p10: 7497 // If the class definition does not explicitly declare a copy 7498 // assignment operator, one is declared implicitly. 7499 // The implicitly-defined copy assignment operator for a class X 7500 // will have the form 7501 // 7502 // X& X::operator=(const X&) 7503 // 7504 // if 7505 bool HasConstCopyAssignment = true; 7506 7507 // -- each direct base class B of X has a copy assignment operator 7508 // whose parameter is of type const B&, const volatile B& or B, 7509 // and 7510 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7511 BaseEnd = ClassDecl->bases_end(); 7512 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7513 // We'll handle this below 7514 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7515 continue; 7516 7517 assert(!Base->getType()->isDependentType() && 7518 "Cannot generate implicit members for class with dependent bases."); 7519 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7520 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7521 &HasConstCopyAssignment); 7522 } 7523 7524 // In C++11, the above citation has "or virtual" added 7525 if (LangOpts.CPlusPlus0x) { 7526 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7527 BaseEnd = ClassDecl->vbases_end(); 7528 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7529 assert(!Base->getType()->isDependentType() && 7530 "Cannot generate implicit members for class with dependent bases."); 7531 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7532 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7533 &HasConstCopyAssignment); 7534 } 7535 } 7536 7537 // -- for all the nonstatic data members of X that are of a class 7538 // type M (or array thereof), each such class type has a copy 7539 // assignment operator whose parameter is of type const M&, 7540 // const volatile M& or M. 7541 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7542 FieldEnd = ClassDecl->field_end(); 7543 HasConstCopyAssignment && Field != FieldEnd; 7544 ++Field) { 7545 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7546 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7547 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 7548 &HasConstCopyAssignment); 7549 } 7550 } 7551 7552 // Otherwise, the implicitly declared copy assignment operator will 7553 // have the form 7554 // 7555 // X& X::operator=(X&) 7556 7557 // C++ [except.spec]p14: 7558 // An implicitly declared special member function (Clause 12) shall have an 7559 // exception-specification. [...] 7560 7561 // It is unspecified whether or not an implicit copy assignment operator 7562 // attempts to deduplicate calls to assignment operators of virtual bases are 7563 // made. As such, this exception specification is effectively unspecified. 7564 // Based on a similar decision made for constness in C++0x, we're erring on 7565 // the side of assuming such calls to be made regardless of whether they 7566 // actually happen. 7567 ImplicitExceptionSpecification ExceptSpec(Context); 7568 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7569 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7570 BaseEnd = ClassDecl->bases_end(); 7571 Base != BaseEnd; ++Base) { 7572 if (Base->isVirtual()) 7573 continue; 7574 7575 CXXRecordDecl *BaseClassDecl 7576 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7577 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7578 ArgQuals, false, 0)) 7579 ExceptSpec.CalledDecl(CopyAssign); 7580 } 7581 7582 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7583 BaseEnd = ClassDecl->vbases_end(); 7584 Base != BaseEnd; ++Base) { 7585 CXXRecordDecl *BaseClassDecl 7586 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7587 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7588 ArgQuals, false, 0)) 7589 ExceptSpec.CalledDecl(CopyAssign); 7590 } 7591 7592 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7593 FieldEnd = ClassDecl->field_end(); 7594 Field != FieldEnd; 7595 ++Field) { 7596 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7597 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7598 if (CXXMethodDecl *CopyAssign = 7599 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7600 ExceptSpec.CalledDecl(CopyAssign); 7601 } 7602 } 7603 7604 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7605} 7606 7607CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7608 // Note: The following rules are largely analoguous to the copy 7609 // constructor rules. Note that virtual bases are not taken into account 7610 // for determining the argument type of the operator. Note also that 7611 // operators taking an object instead of a reference are allowed. 7612 7613 ImplicitExceptionSpecification Spec(Context); 7614 bool Const; 7615 llvm::tie(Spec, Const) = 7616 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7617 7618 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7619 QualType RetType = Context.getLValueReferenceType(ArgType); 7620 if (Const) 7621 ArgType = ArgType.withConst(); 7622 ArgType = Context.getLValueReferenceType(ArgType); 7623 7624 // An implicitly-declared copy assignment operator is an inline public 7625 // member of its class. 7626 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7627 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7628 SourceLocation ClassLoc = ClassDecl->getLocation(); 7629 DeclarationNameInfo NameInfo(Name, ClassLoc); 7630 CXXMethodDecl *CopyAssignment 7631 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7632 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7633 /*TInfo=*/0, /*isStatic=*/false, 7634 /*StorageClassAsWritten=*/SC_None, 7635 /*isInline=*/true, /*isConstexpr=*/false, 7636 SourceLocation()); 7637 CopyAssignment->setAccess(AS_public); 7638 CopyAssignment->setDefaulted(); 7639 CopyAssignment->setImplicit(); 7640 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7641 7642 // Add the parameter to the operator. 7643 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7644 ClassLoc, ClassLoc, /*Id=*/0, 7645 ArgType, /*TInfo=*/0, 7646 SC_None, 7647 SC_None, 0); 7648 CopyAssignment->setParams(FromParam); 7649 7650 // Note that we have added this copy-assignment operator. 7651 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7652 7653 if (Scope *S = getScopeForContext(ClassDecl)) 7654 PushOnScopeChains(CopyAssignment, S, false); 7655 ClassDecl->addDecl(CopyAssignment); 7656 7657 // C++0x [class.copy]p19: 7658 // .... If the class definition does not explicitly declare a copy 7659 // assignment operator, there is no user-declared move constructor, and 7660 // there is no user-declared move assignment operator, a copy assignment 7661 // operator is implicitly declared as defaulted. 7662 if ((ClassDecl->hasUserDeclaredMoveConstructor() && 7663 !getLangOpts().MicrosoftMode) || 7664 ClassDecl->hasUserDeclaredMoveAssignment() || 7665 ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 7666 CopyAssignment->setDeletedAsWritten(); 7667 7668 AddOverriddenMethods(ClassDecl, CopyAssignment); 7669 return CopyAssignment; 7670} 7671 7672void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7673 CXXMethodDecl *CopyAssignOperator) { 7674 assert((CopyAssignOperator->isDefaulted() && 7675 CopyAssignOperator->isOverloadedOperator() && 7676 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7677 !CopyAssignOperator->doesThisDeclarationHaveABody() && 7678 !CopyAssignOperator->isDeleted()) && 7679 "DefineImplicitCopyAssignment called for wrong function"); 7680 7681 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7682 7683 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7684 CopyAssignOperator->setInvalidDecl(); 7685 return; 7686 } 7687 7688 CopyAssignOperator->setUsed(); 7689 7690 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7691 DiagnosticErrorTrap Trap(Diags); 7692 7693 // C++0x [class.copy]p30: 7694 // The implicitly-defined or explicitly-defaulted copy assignment operator 7695 // for a non-union class X performs memberwise copy assignment of its 7696 // subobjects. The direct base classes of X are assigned first, in the 7697 // order of their declaration in the base-specifier-list, and then the 7698 // immediate non-static data members of X are assigned, in the order in 7699 // which they were declared in the class definition. 7700 7701 // The statements that form the synthesized function body. 7702 ASTOwningVector<Stmt*> Statements(*this); 7703 7704 // The parameter for the "other" object, which we are copying from. 7705 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7706 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7707 QualType OtherRefType = Other->getType(); 7708 if (const LValueReferenceType *OtherRef 7709 = OtherRefType->getAs<LValueReferenceType>()) { 7710 OtherRefType = OtherRef->getPointeeType(); 7711 OtherQuals = OtherRefType.getQualifiers(); 7712 } 7713 7714 // Our location for everything implicitly-generated. 7715 SourceLocation Loc = CopyAssignOperator->getLocation(); 7716 7717 // Construct a reference to the "other" object. We'll be using this 7718 // throughout the generated ASTs. 7719 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7720 assert(OtherRef && "Reference to parameter cannot fail!"); 7721 7722 // Construct the "this" pointer. We'll be using this throughout the generated 7723 // ASTs. 7724 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7725 assert(This && "Reference to this cannot fail!"); 7726 7727 // Assign base classes. 7728 bool Invalid = false; 7729 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7730 E = ClassDecl->bases_end(); Base != E; ++Base) { 7731 // Form the assignment: 7732 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7733 QualType BaseType = Base->getType().getUnqualifiedType(); 7734 if (!BaseType->isRecordType()) { 7735 Invalid = true; 7736 continue; 7737 } 7738 7739 CXXCastPath BasePath; 7740 BasePath.push_back(Base); 7741 7742 // Construct the "from" expression, which is an implicit cast to the 7743 // appropriately-qualified base type. 7744 Expr *From = OtherRef; 7745 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7746 CK_UncheckedDerivedToBase, 7747 VK_LValue, &BasePath).take(); 7748 7749 // Dereference "this". 7750 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7751 7752 // Implicitly cast "this" to the appropriately-qualified base type. 7753 To = ImpCastExprToType(To.take(), 7754 Context.getCVRQualifiedType(BaseType, 7755 CopyAssignOperator->getTypeQualifiers()), 7756 CK_UncheckedDerivedToBase, 7757 VK_LValue, &BasePath); 7758 7759 // Build the copy. 7760 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7761 To.get(), From, 7762 /*CopyingBaseSubobject=*/true, 7763 /*Copying=*/true); 7764 if (Copy.isInvalid()) { 7765 Diag(CurrentLocation, diag::note_member_synthesized_at) 7766 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7767 CopyAssignOperator->setInvalidDecl(); 7768 return; 7769 } 7770 7771 // Success! Record the copy. 7772 Statements.push_back(Copy.takeAs<Expr>()); 7773 } 7774 7775 // \brief Reference to the __builtin_memcpy function. 7776 Expr *BuiltinMemCpyRef = 0; 7777 // \brief Reference to the __builtin_objc_memmove_collectable function. 7778 Expr *CollectableMemCpyRef = 0; 7779 7780 // Assign non-static members. 7781 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7782 FieldEnd = ClassDecl->field_end(); 7783 Field != FieldEnd; ++Field) { 7784 if (Field->isUnnamedBitfield()) 7785 continue; 7786 7787 // Check for members of reference type; we can't copy those. 7788 if (Field->getType()->isReferenceType()) { 7789 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7790 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7791 Diag(Field->getLocation(), diag::note_declared_at); 7792 Diag(CurrentLocation, diag::note_member_synthesized_at) 7793 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7794 Invalid = true; 7795 continue; 7796 } 7797 7798 // Check for members of const-qualified, non-class type. 7799 QualType BaseType = Context.getBaseElementType(Field->getType()); 7800 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7801 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7802 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7803 Diag(Field->getLocation(), diag::note_declared_at); 7804 Diag(CurrentLocation, diag::note_member_synthesized_at) 7805 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7806 Invalid = true; 7807 continue; 7808 } 7809 7810 // Suppress assigning zero-width bitfields. 7811 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7812 continue; 7813 7814 QualType FieldType = Field->getType().getNonReferenceType(); 7815 if (FieldType->isIncompleteArrayType()) { 7816 assert(ClassDecl->hasFlexibleArrayMember() && 7817 "Incomplete array type is not valid"); 7818 continue; 7819 } 7820 7821 // Build references to the field in the object we're copying from and to. 7822 CXXScopeSpec SS; // Intentionally empty 7823 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7824 LookupMemberName); 7825 MemberLookup.addDecl(*Field); 7826 MemberLookup.resolveKind(); 7827 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7828 Loc, /*IsArrow=*/false, 7829 SS, SourceLocation(), 0, 7830 MemberLookup, 0); 7831 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7832 Loc, /*IsArrow=*/true, 7833 SS, SourceLocation(), 0, 7834 MemberLookup, 0); 7835 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7836 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7837 7838 // If the field should be copied with __builtin_memcpy rather than via 7839 // explicit assignments, do so. This optimization only applies for arrays 7840 // of scalars and arrays of class type with trivial copy-assignment 7841 // operators. 7842 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7843 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7844 // Compute the size of the memory buffer to be copied. 7845 QualType SizeType = Context.getSizeType(); 7846 llvm::APInt Size(Context.getTypeSize(SizeType), 7847 Context.getTypeSizeInChars(BaseType).getQuantity()); 7848 for (const ConstantArrayType *Array 7849 = Context.getAsConstantArrayType(FieldType); 7850 Array; 7851 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7852 llvm::APInt ArraySize 7853 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7854 Size *= ArraySize; 7855 } 7856 7857 // Take the address of the field references for "from" and "to". 7858 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7859 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7860 7861 bool NeedsCollectableMemCpy = 7862 (BaseType->isRecordType() && 7863 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7864 7865 if (NeedsCollectableMemCpy) { 7866 if (!CollectableMemCpyRef) { 7867 // Create a reference to the __builtin_objc_memmove_collectable function. 7868 LookupResult R(*this, 7869 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7870 Loc, LookupOrdinaryName); 7871 LookupName(R, TUScope, true); 7872 7873 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7874 if (!CollectableMemCpy) { 7875 // Something went horribly wrong earlier, and we will have 7876 // complained about it. 7877 Invalid = true; 7878 continue; 7879 } 7880 7881 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7882 CollectableMemCpy->getType(), 7883 VK_LValue, Loc, 0).take(); 7884 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7885 } 7886 } 7887 // Create a reference to the __builtin_memcpy builtin function. 7888 else if (!BuiltinMemCpyRef) { 7889 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7890 LookupOrdinaryName); 7891 LookupName(R, TUScope, true); 7892 7893 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7894 if (!BuiltinMemCpy) { 7895 // Something went horribly wrong earlier, and we will have complained 7896 // about it. 7897 Invalid = true; 7898 continue; 7899 } 7900 7901 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7902 BuiltinMemCpy->getType(), 7903 VK_LValue, Loc, 0).take(); 7904 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7905 } 7906 7907 ASTOwningVector<Expr*> CallArgs(*this); 7908 CallArgs.push_back(To.takeAs<Expr>()); 7909 CallArgs.push_back(From.takeAs<Expr>()); 7910 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7911 ExprResult Call = ExprError(); 7912 if (NeedsCollectableMemCpy) 7913 Call = ActOnCallExpr(/*Scope=*/0, 7914 CollectableMemCpyRef, 7915 Loc, move_arg(CallArgs), 7916 Loc); 7917 else 7918 Call = ActOnCallExpr(/*Scope=*/0, 7919 BuiltinMemCpyRef, 7920 Loc, move_arg(CallArgs), 7921 Loc); 7922 7923 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7924 Statements.push_back(Call.takeAs<Expr>()); 7925 continue; 7926 } 7927 7928 // Build the copy of this field. 7929 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7930 To.get(), From.get(), 7931 /*CopyingBaseSubobject=*/false, 7932 /*Copying=*/true); 7933 if (Copy.isInvalid()) { 7934 Diag(CurrentLocation, diag::note_member_synthesized_at) 7935 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7936 CopyAssignOperator->setInvalidDecl(); 7937 return; 7938 } 7939 7940 // Success! Record the copy. 7941 Statements.push_back(Copy.takeAs<Stmt>()); 7942 } 7943 7944 if (!Invalid) { 7945 // Add a "return *this;" 7946 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7947 7948 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7949 if (Return.isInvalid()) 7950 Invalid = true; 7951 else { 7952 Statements.push_back(Return.takeAs<Stmt>()); 7953 7954 if (Trap.hasErrorOccurred()) { 7955 Diag(CurrentLocation, diag::note_member_synthesized_at) 7956 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7957 Invalid = true; 7958 } 7959 } 7960 } 7961 7962 if (Invalid) { 7963 CopyAssignOperator->setInvalidDecl(); 7964 return; 7965 } 7966 7967 StmtResult Body; 7968 { 7969 CompoundScopeRAII CompoundScope(*this); 7970 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7971 /*isStmtExpr=*/false); 7972 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7973 } 7974 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7975 7976 if (ASTMutationListener *L = getASTMutationListener()) { 7977 L->CompletedImplicitDefinition(CopyAssignOperator); 7978 } 7979} 7980 7981Sema::ImplicitExceptionSpecification 7982Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 7983 ImplicitExceptionSpecification ExceptSpec(Context); 7984 7985 if (ClassDecl->isInvalidDecl()) 7986 return ExceptSpec; 7987 7988 // C++0x [except.spec]p14: 7989 // An implicitly declared special member function (Clause 12) shall have an 7990 // exception-specification. [...] 7991 7992 // It is unspecified whether or not an implicit move assignment operator 7993 // attempts to deduplicate calls to assignment operators of virtual bases are 7994 // made. As such, this exception specification is effectively unspecified. 7995 // Based on a similar decision made for constness in C++0x, we're erring on 7996 // the side of assuming such calls to be made regardless of whether they 7997 // actually happen. 7998 // Note that a move constructor is not implicitly declared when there are 7999 // virtual bases, but it can still be user-declared and explicitly defaulted. 8000 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8001 BaseEnd = ClassDecl->bases_end(); 8002 Base != BaseEnd; ++Base) { 8003 if (Base->isVirtual()) 8004 continue; 8005 8006 CXXRecordDecl *BaseClassDecl 8007 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8008 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8009 false, 0)) 8010 ExceptSpec.CalledDecl(MoveAssign); 8011 } 8012 8013 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8014 BaseEnd = ClassDecl->vbases_end(); 8015 Base != BaseEnd; ++Base) { 8016 CXXRecordDecl *BaseClassDecl 8017 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8018 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8019 false, 0)) 8020 ExceptSpec.CalledDecl(MoveAssign); 8021 } 8022 8023 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8024 FieldEnd = ClassDecl->field_end(); 8025 Field != FieldEnd; 8026 ++Field) { 8027 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8028 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8029 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 8030 false, 0)) 8031 ExceptSpec.CalledDecl(MoveAssign); 8032 } 8033 } 8034 8035 return ExceptSpec; 8036} 8037 8038CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8039 // Note: The following rules are largely analoguous to the move 8040 // constructor rules. 8041 8042 ImplicitExceptionSpecification Spec( 8043 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 8044 8045 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8046 QualType RetType = Context.getLValueReferenceType(ArgType); 8047 ArgType = Context.getRValueReferenceType(ArgType); 8048 8049 // An implicitly-declared move assignment operator is an inline public 8050 // member of its class. 8051 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8052 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8053 SourceLocation ClassLoc = ClassDecl->getLocation(); 8054 DeclarationNameInfo NameInfo(Name, ClassLoc); 8055 CXXMethodDecl *MoveAssignment 8056 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8057 Context.getFunctionType(RetType, &ArgType, 1, EPI), 8058 /*TInfo=*/0, /*isStatic=*/false, 8059 /*StorageClassAsWritten=*/SC_None, 8060 /*isInline=*/true, 8061 /*isConstexpr=*/false, 8062 SourceLocation()); 8063 MoveAssignment->setAccess(AS_public); 8064 MoveAssignment->setDefaulted(); 8065 MoveAssignment->setImplicit(); 8066 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8067 8068 // Add the parameter to the operator. 8069 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8070 ClassLoc, ClassLoc, /*Id=*/0, 8071 ArgType, /*TInfo=*/0, 8072 SC_None, 8073 SC_None, 0); 8074 MoveAssignment->setParams(FromParam); 8075 8076 // Note that we have added this copy-assignment operator. 8077 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8078 8079 // C++0x [class.copy]p9: 8080 // If the definition of a class X does not explicitly declare a move 8081 // assignment operator, one will be implicitly declared as defaulted if and 8082 // only if: 8083 // [...] 8084 // - the move assignment operator would not be implicitly defined as 8085 // deleted. 8086 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 8087 // Cache this result so that we don't try to generate this over and over 8088 // on every lookup, leaking memory and wasting time. 8089 ClassDecl->setFailedImplicitMoveAssignment(); 8090 return 0; 8091 } 8092 8093 if (Scope *S = getScopeForContext(ClassDecl)) 8094 PushOnScopeChains(MoveAssignment, S, false); 8095 ClassDecl->addDecl(MoveAssignment); 8096 8097 AddOverriddenMethods(ClassDecl, MoveAssignment); 8098 return MoveAssignment; 8099} 8100 8101void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8102 CXXMethodDecl *MoveAssignOperator) { 8103 assert((MoveAssignOperator->isDefaulted() && 8104 MoveAssignOperator->isOverloadedOperator() && 8105 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8106 !MoveAssignOperator->doesThisDeclarationHaveABody() && 8107 !MoveAssignOperator->isDeleted()) && 8108 "DefineImplicitMoveAssignment called for wrong function"); 8109 8110 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8111 8112 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8113 MoveAssignOperator->setInvalidDecl(); 8114 return; 8115 } 8116 8117 MoveAssignOperator->setUsed(); 8118 8119 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8120 DiagnosticErrorTrap Trap(Diags); 8121 8122 // C++0x [class.copy]p28: 8123 // The implicitly-defined or move assignment operator for a non-union class 8124 // X performs memberwise move assignment of its subobjects. The direct base 8125 // classes of X are assigned first, in the order of their declaration in the 8126 // base-specifier-list, and then the immediate non-static data members of X 8127 // are assigned, in the order in which they were declared in the class 8128 // definition. 8129 8130 // The statements that form the synthesized function body. 8131 ASTOwningVector<Stmt*> Statements(*this); 8132 8133 // The parameter for the "other" object, which we are move from. 8134 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8135 QualType OtherRefType = Other->getType()-> 8136 getAs<RValueReferenceType>()->getPointeeType(); 8137 assert(OtherRefType.getQualifiers() == 0 && 8138 "Bad argument type of defaulted move assignment"); 8139 8140 // Our location for everything implicitly-generated. 8141 SourceLocation Loc = MoveAssignOperator->getLocation(); 8142 8143 // Construct a reference to the "other" object. We'll be using this 8144 // throughout the generated ASTs. 8145 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8146 assert(OtherRef && "Reference to parameter cannot fail!"); 8147 // Cast to rvalue. 8148 OtherRef = CastForMoving(*this, OtherRef); 8149 8150 // Construct the "this" pointer. We'll be using this throughout the generated 8151 // ASTs. 8152 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8153 assert(This && "Reference to this cannot fail!"); 8154 8155 // Assign base classes. 8156 bool Invalid = false; 8157 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8158 E = ClassDecl->bases_end(); Base != E; ++Base) { 8159 // Form the assignment: 8160 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8161 QualType BaseType = Base->getType().getUnqualifiedType(); 8162 if (!BaseType->isRecordType()) { 8163 Invalid = true; 8164 continue; 8165 } 8166 8167 CXXCastPath BasePath; 8168 BasePath.push_back(Base); 8169 8170 // Construct the "from" expression, which is an implicit cast to the 8171 // appropriately-qualified base type. 8172 Expr *From = OtherRef; 8173 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8174 VK_XValue, &BasePath).take(); 8175 8176 // Dereference "this". 8177 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8178 8179 // Implicitly cast "this" to the appropriately-qualified base type. 8180 To = ImpCastExprToType(To.take(), 8181 Context.getCVRQualifiedType(BaseType, 8182 MoveAssignOperator->getTypeQualifiers()), 8183 CK_UncheckedDerivedToBase, 8184 VK_LValue, &BasePath); 8185 8186 // Build the move. 8187 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8188 To.get(), From, 8189 /*CopyingBaseSubobject=*/true, 8190 /*Copying=*/false); 8191 if (Move.isInvalid()) { 8192 Diag(CurrentLocation, diag::note_member_synthesized_at) 8193 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8194 MoveAssignOperator->setInvalidDecl(); 8195 return; 8196 } 8197 8198 // Success! Record the move. 8199 Statements.push_back(Move.takeAs<Expr>()); 8200 } 8201 8202 // \brief Reference to the __builtin_memcpy function. 8203 Expr *BuiltinMemCpyRef = 0; 8204 // \brief Reference to the __builtin_objc_memmove_collectable function. 8205 Expr *CollectableMemCpyRef = 0; 8206 8207 // Assign non-static members. 8208 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8209 FieldEnd = ClassDecl->field_end(); 8210 Field != FieldEnd; ++Field) { 8211 if (Field->isUnnamedBitfield()) 8212 continue; 8213 8214 // Check for members of reference type; we can't move those. 8215 if (Field->getType()->isReferenceType()) { 8216 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8217 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8218 Diag(Field->getLocation(), diag::note_declared_at); 8219 Diag(CurrentLocation, diag::note_member_synthesized_at) 8220 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8221 Invalid = true; 8222 continue; 8223 } 8224 8225 // Check for members of const-qualified, non-class type. 8226 QualType BaseType = Context.getBaseElementType(Field->getType()); 8227 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8228 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8229 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8230 Diag(Field->getLocation(), diag::note_declared_at); 8231 Diag(CurrentLocation, diag::note_member_synthesized_at) 8232 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8233 Invalid = true; 8234 continue; 8235 } 8236 8237 // Suppress assigning zero-width bitfields. 8238 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8239 continue; 8240 8241 QualType FieldType = Field->getType().getNonReferenceType(); 8242 if (FieldType->isIncompleteArrayType()) { 8243 assert(ClassDecl->hasFlexibleArrayMember() && 8244 "Incomplete array type is not valid"); 8245 continue; 8246 } 8247 8248 // Build references to the field in the object we're copying from and to. 8249 CXXScopeSpec SS; // Intentionally empty 8250 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8251 LookupMemberName); 8252 MemberLookup.addDecl(*Field); 8253 MemberLookup.resolveKind(); 8254 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8255 Loc, /*IsArrow=*/false, 8256 SS, SourceLocation(), 0, 8257 MemberLookup, 0); 8258 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8259 Loc, /*IsArrow=*/true, 8260 SS, SourceLocation(), 0, 8261 MemberLookup, 0); 8262 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8263 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8264 8265 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8266 "Member reference with rvalue base must be rvalue except for reference " 8267 "members, which aren't allowed for move assignment."); 8268 8269 // If the field should be copied with __builtin_memcpy rather than via 8270 // explicit assignments, do so. This optimization only applies for arrays 8271 // of scalars and arrays of class type with trivial move-assignment 8272 // operators. 8273 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8274 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8275 // Compute the size of the memory buffer to be copied. 8276 QualType SizeType = Context.getSizeType(); 8277 llvm::APInt Size(Context.getTypeSize(SizeType), 8278 Context.getTypeSizeInChars(BaseType).getQuantity()); 8279 for (const ConstantArrayType *Array 8280 = Context.getAsConstantArrayType(FieldType); 8281 Array; 8282 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8283 llvm::APInt ArraySize 8284 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8285 Size *= ArraySize; 8286 } 8287 8288 // Take the address of the field references for "from" and "to". We 8289 // directly construct UnaryOperators here because semantic analysis 8290 // does not permit us to take the address of an xvalue. 8291 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8292 Context.getPointerType(From.get()->getType()), 8293 VK_RValue, OK_Ordinary, Loc); 8294 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8295 Context.getPointerType(To.get()->getType()), 8296 VK_RValue, OK_Ordinary, Loc); 8297 8298 bool NeedsCollectableMemCpy = 8299 (BaseType->isRecordType() && 8300 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8301 8302 if (NeedsCollectableMemCpy) { 8303 if (!CollectableMemCpyRef) { 8304 // Create a reference to the __builtin_objc_memmove_collectable function. 8305 LookupResult R(*this, 8306 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8307 Loc, LookupOrdinaryName); 8308 LookupName(R, TUScope, true); 8309 8310 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8311 if (!CollectableMemCpy) { 8312 // Something went horribly wrong earlier, and we will have 8313 // complained about it. 8314 Invalid = true; 8315 continue; 8316 } 8317 8318 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8319 CollectableMemCpy->getType(), 8320 VK_LValue, Loc, 0).take(); 8321 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8322 } 8323 } 8324 // Create a reference to the __builtin_memcpy builtin function. 8325 else if (!BuiltinMemCpyRef) { 8326 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8327 LookupOrdinaryName); 8328 LookupName(R, TUScope, true); 8329 8330 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8331 if (!BuiltinMemCpy) { 8332 // Something went horribly wrong earlier, and we will have complained 8333 // about it. 8334 Invalid = true; 8335 continue; 8336 } 8337 8338 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8339 BuiltinMemCpy->getType(), 8340 VK_LValue, Loc, 0).take(); 8341 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8342 } 8343 8344 ASTOwningVector<Expr*> CallArgs(*this); 8345 CallArgs.push_back(To.takeAs<Expr>()); 8346 CallArgs.push_back(From.takeAs<Expr>()); 8347 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8348 ExprResult Call = ExprError(); 8349 if (NeedsCollectableMemCpy) 8350 Call = ActOnCallExpr(/*Scope=*/0, 8351 CollectableMemCpyRef, 8352 Loc, move_arg(CallArgs), 8353 Loc); 8354 else 8355 Call = ActOnCallExpr(/*Scope=*/0, 8356 BuiltinMemCpyRef, 8357 Loc, move_arg(CallArgs), 8358 Loc); 8359 8360 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8361 Statements.push_back(Call.takeAs<Expr>()); 8362 continue; 8363 } 8364 8365 // Build the move of this field. 8366 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8367 To.get(), From.get(), 8368 /*CopyingBaseSubobject=*/false, 8369 /*Copying=*/false); 8370 if (Move.isInvalid()) { 8371 Diag(CurrentLocation, diag::note_member_synthesized_at) 8372 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8373 MoveAssignOperator->setInvalidDecl(); 8374 return; 8375 } 8376 8377 // Success! Record the copy. 8378 Statements.push_back(Move.takeAs<Stmt>()); 8379 } 8380 8381 if (!Invalid) { 8382 // Add a "return *this;" 8383 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8384 8385 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8386 if (Return.isInvalid()) 8387 Invalid = true; 8388 else { 8389 Statements.push_back(Return.takeAs<Stmt>()); 8390 8391 if (Trap.hasErrorOccurred()) { 8392 Diag(CurrentLocation, diag::note_member_synthesized_at) 8393 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8394 Invalid = true; 8395 } 8396 } 8397 } 8398 8399 if (Invalid) { 8400 MoveAssignOperator->setInvalidDecl(); 8401 return; 8402 } 8403 8404 StmtResult Body; 8405 { 8406 CompoundScopeRAII CompoundScope(*this); 8407 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8408 /*isStmtExpr=*/false); 8409 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8410 } 8411 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8412 8413 if (ASTMutationListener *L = getASTMutationListener()) { 8414 L->CompletedImplicitDefinition(MoveAssignOperator); 8415 } 8416} 8417 8418std::pair<Sema::ImplicitExceptionSpecification, bool> 8419Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8420 if (ClassDecl->isInvalidDecl()) 8421 return std::make_pair(ImplicitExceptionSpecification(Context), false); 8422 8423 // C++ [class.copy]p5: 8424 // The implicitly-declared copy constructor for a class X will 8425 // have the form 8426 // 8427 // X::X(const X&) 8428 // 8429 // if 8430 // FIXME: It ought to be possible to store this on the record. 8431 bool HasConstCopyConstructor = true; 8432 8433 // -- each direct or virtual base class B of X has a copy 8434 // constructor whose first parameter is of type const B& or 8435 // const volatile B&, and 8436 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8437 BaseEnd = ClassDecl->bases_end(); 8438 HasConstCopyConstructor && Base != BaseEnd; 8439 ++Base) { 8440 // Virtual bases are handled below. 8441 if (Base->isVirtual()) 8442 continue; 8443 8444 CXXRecordDecl *BaseClassDecl 8445 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8446 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8447 &HasConstCopyConstructor); 8448 } 8449 8450 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8451 BaseEnd = ClassDecl->vbases_end(); 8452 HasConstCopyConstructor && Base != BaseEnd; 8453 ++Base) { 8454 CXXRecordDecl *BaseClassDecl 8455 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8456 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8457 &HasConstCopyConstructor); 8458 } 8459 8460 // -- for all the nonstatic data members of X that are of a 8461 // class type M (or array thereof), each such class type 8462 // has a copy constructor whose first parameter is of type 8463 // const M& or const volatile M&. 8464 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8465 FieldEnd = ClassDecl->field_end(); 8466 HasConstCopyConstructor && Field != FieldEnd; 8467 ++Field) { 8468 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8469 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8470 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 8471 &HasConstCopyConstructor); 8472 } 8473 } 8474 // Otherwise, the implicitly declared copy constructor will have 8475 // the form 8476 // 8477 // X::X(X&) 8478 8479 // C++ [except.spec]p14: 8480 // An implicitly declared special member function (Clause 12) shall have an 8481 // exception-specification. [...] 8482 ImplicitExceptionSpecification ExceptSpec(Context); 8483 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8484 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8485 BaseEnd = ClassDecl->bases_end(); 8486 Base != BaseEnd; 8487 ++Base) { 8488 // Virtual bases are handled below. 8489 if (Base->isVirtual()) 8490 continue; 8491 8492 CXXRecordDecl *BaseClassDecl 8493 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8494 if (CXXConstructorDecl *CopyConstructor = 8495 LookupCopyingConstructor(BaseClassDecl, Quals)) 8496 ExceptSpec.CalledDecl(CopyConstructor); 8497 } 8498 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8499 BaseEnd = ClassDecl->vbases_end(); 8500 Base != BaseEnd; 8501 ++Base) { 8502 CXXRecordDecl *BaseClassDecl 8503 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8504 if (CXXConstructorDecl *CopyConstructor = 8505 LookupCopyingConstructor(BaseClassDecl, Quals)) 8506 ExceptSpec.CalledDecl(CopyConstructor); 8507 } 8508 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8509 FieldEnd = ClassDecl->field_end(); 8510 Field != FieldEnd; 8511 ++Field) { 8512 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8513 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8514 if (CXXConstructorDecl *CopyConstructor = 8515 LookupCopyingConstructor(FieldClassDecl, Quals)) 8516 ExceptSpec.CalledDecl(CopyConstructor); 8517 } 8518 } 8519 8520 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8521} 8522 8523CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8524 CXXRecordDecl *ClassDecl) { 8525 // C++ [class.copy]p4: 8526 // If the class definition does not explicitly declare a copy 8527 // constructor, one is declared implicitly. 8528 8529 ImplicitExceptionSpecification Spec(Context); 8530 bool Const; 8531 llvm::tie(Spec, Const) = 8532 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8533 8534 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8535 QualType ArgType = ClassType; 8536 if (Const) 8537 ArgType = ArgType.withConst(); 8538 ArgType = Context.getLValueReferenceType(ArgType); 8539 8540 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8541 8542 DeclarationName Name 8543 = Context.DeclarationNames.getCXXConstructorName( 8544 Context.getCanonicalType(ClassType)); 8545 SourceLocation ClassLoc = ClassDecl->getLocation(); 8546 DeclarationNameInfo NameInfo(Name, ClassLoc); 8547 8548 // An implicitly-declared copy constructor is an inline public 8549 // member of its class. 8550 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8551 Context, ClassDecl, ClassLoc, NameInfo, 8552 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8553 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8554 /*isConstexpr=*/ClassDecl->defaultedCopyConstructorIsConstexpr() && 8555 getLangOpts().CPlusPlus0x); 8556 CopyConstructor->setAccess(AS_public); 8557 CopyConstructor->setDefaulted(); 8558 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8559 8560 // Note that we have declared this constructor. 8561 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8562 8563 // Add the parameter to the constructor. 8564 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8565 ClassLoc, ClassLoc, 8566 /*IdentifierInfo=*/0, 8567 ArgType, /*TInfo=*/0, 8568 SC_None, 8569 SC_None, 0); 8570 CopyConstructor->setParams(FromParam); 8571 8572 if (Scope *S = getScopeForContext(ClassDecl)) 8573 PushOnScopeChains(CopyConstructor, S, false); 8574 ClassDecl->addDecl(CopyConstructor); 8575 8576 // C++11 [class.copy]p8: 8577 // ... If the class definition does not explicitly declare a copy 8578 // constructor, there is no user-declared move constructor, and there is no 8579 // user-declared move assignment operator, a copy constructor is implicitly 8580 // declared as defaulted. 8581 if (ClassDecl->hasUserDeclaredMoveConstructor() || 8582 (ClassDecl->hasUserDeclaredMoveAssignment() && 8583 !getLangOpts().MicrosoftMode) || 8584 ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8585 CopyConstructor->setDeletedAsWritten(); 8586 8587 return CopyConstructor; 8588} 8589 8590void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8591 CXXConstructorDecl *CopyConstructor) { 8592 assert((CopyConstructor->isDefaulted() && 8593 CopyConstructor->isCopyConstructor() && 8594 !CopyConstructor->doesThisDeclarationHaveABody() && 8595 !CopyConstructor->isDeleted()) && 8596 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8597 8598 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8599 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8600 8601 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8602 DiagnosticErrorTrap Trap(Diags); 8603 8604 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8605 Trap.hasErrorOccurred()) { 8606 Diag(CurrentLocation, diag::note_member_synthesized_at) 8607 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8608 CopyConstructor->setInvalidDecl(); 8609 } else { 8610 Sema::CompoundScopeRAII CompoundScope(*this); 8611 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8612 CopyConstructor->getLocation(), 8613 MultiStmtArg(*this, 0, 0), 8614 /*isStmtExpr=*/false) 8615 .takeAs<Stmt>()); 8616 CopyConstructor->setImplicitlyDefined(true); 8617 } 8618 8619 CopyConstructor->setUsed(); 8620 if (ASTMutationListener *L = getASTMutationListener()) { 8621 L->CompletedImplicitDefinition(CopyConstructor); 8622 } 8623} 8624 8625Sema::ImplicitExceptionSpecification 8626Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8627 // C++ [except.spec]p14: 8628 // An implicitly declared special member function (Clause 12) shall have an 8629 // exception-specification. [...] 8630 ImplicitExceptionSpecification ExceptSpec(Context); 8631 if (ClassDecl->isInvalidDecl()) 8632 return ExceptSpec; 8633 8634 // Direct base-class constructors. 8635 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8636 BEnd = ClassDecl->bases_end(); 8637 B != BEnd; ++B) { 8638 if (B->isVirtual()) // Handled below. 8639 continue; 8640 8641 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8642 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8643 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8644 // If this is a deleted function, add it anyway. This might be conformant 8645 // with the standard. This might not. I'm not sure. It might not matter. 8646 if (Constructor) 8647 ExceptSpec.CalledDecl(Constructor); 8648 } 8649 } 8650 8651 // Virtual base-class constructors. 8652 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8653 BEnd = ClassDecl->vbases_end(); 8654 B != BEnd; ++B) { 8655 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8656 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8657 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8658 // If this is a deleted function, add it anyway. This might be conformant 8659 // with the standard. This might not. I'm not sure. It might not matter. 8660 if (Constructor) 8661 ExceptSpec.CalledDecl(Constructor); 8662 } 8663 } 8664 8665 // Field constructors. 8666 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8667 FEnd = ClassDecl->field_end(); 8668 F != FEnd; ++F) { 8669 if (const RecordType *RecordTy 8670 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8671 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8672 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8673 // If this is a deleted function, add it anyway. This might be conformant 8674 // with the standard. This might not. I'm not sure. It might not matter. 8675 // In particular, the problem is that this function never gets called. It 8676 // might just be ill-formed because this function attempts to refer to 8677 // a deleted function here. 8678 if (Constructor) 8679 ExceptSpec.CalledDecl(Constructor); 8680 } 8681 } 8682 8683 return ExceptSpec; 8684} 8685 8686CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8687 CXXRecordDecl *ClassDecl) { 8688 ImplicitExceptionSpecification Spec( 8689 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8690 8691 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8692 QualType ArgType = Context.getRValueReferenceType(ClassType); 8693 8694 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8695 8696 DeclarationName Name 8697 = Context.DeclarationNames.getCXXConstructorName( 8698 Context.getCanonicalType(ClassType)); 8699 SourceLocation ClassLoc = ClassDecl->getLocation(); 8700 DeclarationNameInfo NameInfo(Name, ClassLoc); 8701 8702 // C++0x [class.copy]p11: 8703 // An implicitly-declared copy/move constructor is an inline public 8704 // member of its class. 8705 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8706 Context, ClassDecl, ClassLoc, NameInfo, 8707 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8708 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8709 /*isConstexpr=*/ClassDecl->defaultedMoveConstructorIsConstexpr() && 8710 getLangOpts().CPlusPlus0x); 8711 MoveConstructor->setAccess(AS_public); 8712 MoveConstructor->setDefaulted(); 8713 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8714 8715 // Add the parameter to the constructor. 8716 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8717 ClassLoc, ClassLoc, 8718 /*IdentifierInfo=*/0, 8719 ArgType, /*TInfo=*/0, 8720 SC_None, 8721 SC_None, 0); 8722 MoveConstructor->setParams(FromParam); 8723 8724 // C++0x [class.copy]p9: 8725 // If the definition of a class X does not explicitly declare a move 8726 // constructor, one will be implicitly declared as defaulted if and only if: 8727 // [...] 8728 // - the move constructor would not be implicitly defined as deleted. 8729 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8730 // Cache this result so that we don't try to generate this over and over 8731 // on every lookup, leaking memory and wasting time. 8732 ClassDecl->setFailedImplicitMoveConstructor(); 8733 return 0; 8734 } 8735 8736 // Note that we have declared this constructor. 8737 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8738 8739 if (Scope *S = getScopeForContext(ClassDecl)) 8740 PushOnScopeChains(MoveConstructor, S, false); 8741 ClassDecl->addDecl(MoveConstructor); 8742 8743 return MoveConstructor; 8744} 8745 8746void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8747 CXXConstructorDecl *MoveConstructor) { 8748 assert((MoveConstructor->isDefaulted() && 8749 MoveConstructor->isMoveConstructor() && 8750 !MoveConstructor->doesThisDeclarationHaveABody() && 8751 !MoveConstructor->isDeleted()) && 8752 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8753 8754 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8755 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8756 8757 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8758 DiagnosticErrorTrap Trap(Diags); 8759 8760 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8761 Trap.hasErrorOccurred()) { 8762 Diag(CurrentLocation, diag::note_member_synthesized_at) 8763 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8764 MoveConstructor->setInvalidDecl(); 8765 } else { 8766 Sema::CompoundScopeRAII CompoundScope(*this); 8767 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8768 MoveConstructor->getLocation(), 8769 MultiStmtArg(*this, 0, 0), 8770 /*isStmtExpr=*/false) 8771 .takeAs<Stmt>()); 8772 MoveConstructor->setImplicitlyDefined(true); 8773 } 8774 8775 MoveConstructor->setUsed(); 8776 8777 if (ASTMutationListener *L = getASTMutationListener()) { 8778 L->CompletedImplicitDefinition(MoveConstructor); 8779 } 8780} 8781 8782bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 8783 return FD->isDeleted() && 8784 (FD->isDefaulted() || FD->isImplicit()) && 8785 isa<CXXMethodDecl>(FD); 8786} 8787 8788/// \brief Mark the call operator of the given lambda closure type as "used". 8789static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 8790 CXXMethodDecl *CallOperator 8791 = cast<CXXMethodDecl>( 8792 *Lambda->lookup( 8793 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).first); 8794 CallOperator->setReferenced(); 8795 CallOperator->setUsed(); 8796} 8797 8798void Sema::DefineImplicitLambdaToFunctionPointerConversion( 8799 SourceLocation CurrentLocation, 8800 CXXConversionDecl *Conv) 8801{ 8802 CXXRecordDecl *Lambda = Conv->getParent(); 8803 8804 // Make sure that the lambda call operator is marked used. 8805 markLambdaCallOperatorUsed(*this, Lambda); 8806 8807 Conv->setUsed(); 8808 8809 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8810 DiagnosticErrorTrap Trap(Diags); 8811 8812 // Return the address of the __invoke function. 8813 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 8814 CXXMethodDecl *Invoke 8815 = cast<CXXMethodDecl>(*Lambda->lookup(InvokeName).first); 8816 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 8817 VK_LValue, Conv->getLocation()).take(); 8818 assert(FunctionRef && "Can't refer to __invoke function?"); 8819 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 8820 Conv->setBody(new (Context) CompoundStmt(Context, &Return, 1, 8821 Conv->getLocation(), 8822 Conv->getLocation())); 8823 8824 // Fill in the __invoke function with a dummy implementation. IR generation 8825 // will fill in the actual details. 8826 Invoke->setUsed(); 8827 Invoke->setReferenced(); 8828 Invoke->setBody(new (Context) CompoundStmt(Context, 0, 0, Conv->getLocation(), 8829 Conv->getLocation())); 8830 8831 if (ASTMutationListener *L = getASTMutationListener()) { 8832 L->CompletedImplicitDefinition(Conv); 8833 L->CompletedImplicitDefinition(Invoke); 8834 } 8835} 8836 8837void Sema::DefineImplicitLambdaToBlockPointerConversion( 8838 SourceLocation CurrentLocation, 8839 CXXConversionDecl *Conv) 8840{ 8841 Conv->setUsed(); 8842 8843 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8844 DiagnosticErrorTrap Trap(Diags); 8845 8846 // Copy-initialize the lambda object as needed to capture it. 8847 Expr *This = ActOnCXXThis(CurrentLocation).take(); 8848 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 8849 8850 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 8851 Conv->getLocation(), 8852 Conv, DerefThis); 8853 8854 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 8855 // behavior. Note that only the general conversion function does this 8856 // (since it's unusable otherwise); in the case where we inline the 8857 // block literal, it has block literal lifetime semantics. 8858 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 8859 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 8860 CK_CopyAndAutoreleaseBlockObject, 8861 BuildBlock.get(), 0, VK_RValue); 8862 8863 if (BuildBlock.isInvalid()) { 8864 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 8865 Conv->setInvalidDecl(); 8866 return; 8867 } 8868 8869 // Create the return statement that returns the block from the conversion 8870 // function. 8871 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 8872 if (Return.isInvalid()) { 8873 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 8874 Conv->setInvalidDecl(); 8875 return; 8876 } 8877 8878 // Set the body of the conversion function. 8879 Stmt *ReturnS = Return.take(); 8880 Conv->setBody(new (Context) CompoundStmt(Context, &ReturnS, 1, 8881 Conv->getLocation(), 8882 Conv->getLocation())); 8883 8884 // We're done; notify the mutation listener, if any. 8885 if (ASTMutationListener *L = getASTMutationListener()) { 8886 L->CompletedImplicitDefinition(Conv); 8887 } 8888} 8889 8890/// \brief Determine whether the given list arguments contains exactly one 8891/// "real" (non-default) argument. 8892static bool hasOneRealArgument(MultiExprArg Args) { 8893 switch (Args.size()) { 8894 case 0: 8895 return false; 8896 8897 default: 8898 if (!Args.get()[1]->isDefaultArgument()) 8899 return false; 8900 8901 // fall through 8902 case 1: 8903 return !Args.get()[0]->isDefaultArgument(); 8904 } 8905 8906 return false; 8907} 8908 8909ExprResult 8910Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8911 CXXConstructorDecl *Constructor, 8912 MultiExprArg ExprArgs, 8913 bool HadMultipleCandidates, 8914 bool RequiresZeroInit, 8915 unsigned ConstructKind, 8916 SourceRange ParenRange) { 8917 bool Elidable = false; 8918 8919 // C++0x [class.copy]p34: 8920 // When certain criteria are met, an implementation is allowed to 8921 // omit the copy/move construction of a class object, even if the 8922 // copy/move constructor and/or destructor for the object have 8923 // side effects. [...] 8924 // - when a temporary class object that has not been bound to a 8925 // reference (12.2) would be copied/moved to a class object 8926 // with the same cv-unqualified type, the copy/move operation 8927 // can be omitted by constructing the temporary object 8928 // directly into the target of the omitted copy/move 8929 if (ConstructKind == CXXConstructExpr::CK_Complete && 8930 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 8931 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 8932 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 8933 } 8934 8935 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 8936 Elidable, move(ExprArgs), HadMultipleCandidates, 8937 RequiresZeroInit, ConstructKind, ParenRange); 8938} 8939 8940/// BuildCXXConstructExpr - Creates a complete call to a constructor, 8941/// including handling of its default argument expressions. 8942ExprResult 8943Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8944 CXXConstructorDecl *Constructor, bool Elidable, 8945 MultiExprArg ExprArgs, 8946 bool HadMultipleCandidates, 8947 bool RequiresZeroInit, 8948 unsigned ConstructKind, 8949 SourceRange ParenRange) { 8950 unsigned NumExprs = ExprArgs.size(); 8951 Expr **Exprs = (Expr **)ExprArgs.release(); 8952 8953 for (specific_attr_iterator<NonNullAttr> 8954 i = Constructor->specific_attr_begin<NonNullAttr>(), 8955 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 8956 const NonNullAttr *NonNull = *i; 8957 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 8958 } 8959 8960 MarkFunctionReferenced(ConstructLoc, Constructor); 8961 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 8962 Constructor, Elidable, Exprs, NumExprs, 8963 HadMultipleCandidates, /*FIXME*/false, 8964 RequiresZeroInit, 8965 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 8966 ParenRange)); 8967} 8968 8969bool Sema::InitializeVarWithConstructor(VarDecl *VD, 8970 CXXConstructorDecl *Constructor, 8971 MultiExprArg Exprs, 8972 bool HadMultipleCandidates) { 8973 // FIXME: Provide the correct paren SourceRange when available. 8974 ExprResult TempResult = 8975 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 8976 move(Exprs), HadMultipleCandidates, false, 8977 CXXConstructExpr::CK_Complete, SourceRange()); 8978 if (TempResult.isInvalid()) 8979 return true; 8980 8981 Expr *Temp = TempResult.takeAs<Expr>(); 8982 CheckImplicitConversions(Temp, VD->getLocation()); 8983 MarkFunctionReferenced(VD->getLocation(), Constructor); 8984 Temp = MaybeCreateExprWithCleanups(Temp); 8985 VD->setInit(Temp); 8986 8987 return false; 8988} 8989 8990void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 8991 if (VD->isInvalidDecl()) return; 8992 8993 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 8994 if (ClassDecl->isInvalidDecl()) return; 8995 if (ClassDecl->hasIrrelevantDestructor()) return; 8996 if (ClassDecl->isDependentContext()) return; 8997 8998 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 8999 MarkFunctionReferenced(VD->getLocation(), Destructor); 9000 CheckDestructorAccess(VD->getLocation(), Destructor, 9001 PDiag(diag::err_access_dtor_var) 9002 << VD->getDeclName() 9003 << VD->getType()); 9004 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 9005 9006 if (!VD->hasGlobalStorage()) return; 9007 9008 // Emit warning for non-trivial dtor in global scope (a real global, 9009 // class-static, function-static). 9010 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9011 9012 // TODO: this should be re-enabled for static locals by !CXAAtExit 9013 if (!VD->isStaticLocal()) 9014 Diag(VD->getLocation(), diag::warn_global_destructor); 9015} 9016 9017/// \brief Given a constructor and the set of arguments provided for the 9018/// constructor, convert the arguments and add any required default arguments 9019/// to form a proper call to this constructor. 9020/// 9021/// \returns true if an error occurred, false otherwise. 9022bool 9023Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9024 MultiExprArg ArgsPtr, 9025 SourceLocation Loc, 9026 ASTOwningVector<Expr*> &ConvertedArgs, 9027 bool AllowExplicit) { 9028 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9029 unsigned NumArgs = ArgsPtr.size(); 9030 Expr **Args = (Expr **)ArgsPtr.get(); 9031 9032 const FunctionProtoType *Proto 9033 = Constructor->getType()->getAs<FunctionProtoType>(); 9034 assert(Proto && "Constructor without a prototype?"); 9035 unsigned NumArgsInProto = Proto->getNumArgs(); 9036 9037 // If too few arguments are available, we'll fill in the rest with defaults. 9038 if (NumArgs < NumArgsInProto) 9039 ConvertedArgs.reserve(NumArgsInProto); 9040 else 9041 ConvertedArgs.reserve(NumArgs); 9042 9043 VariadicCallType CallType = 9044 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9045 SmallVector<Expr *, 8> AllArgs; 9046 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9047 Proto, 0, Args, NumArgs, AllArgs, 9048 CallType, AllowExplicit); 9049 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 9050 9051 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size()); 9052 9053 // FIXME: Missing call to CheckFunctionCall or equivalent 9054 9055 return Invalid; 9056} 9057 9058static inline bool 9059CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9060 const FunctionDecl *FnDecl) { 9061 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9062 if (isa<NamespaceDecl>(DC)) { 9063 return SemaRef.Diag(FnDecl->getLocation(), 9064 diag::err_operator_new_delete_declared_in_namespace) 9065 << FnDecl->getDeclName(); 9066 } 9067 9068 if (isa<TranslationUnitDecl>(DC) && 9069 FnDecl->getStorageClass() == SC_Static) { 9070 return SemaRef.Diag(FnDecl->getLocation(), 9071 diag::err_operator_new_delete_declared_static) 9072 << FnDecl->getDeclName(); 9073 } 9074 9075 return false; 9076} 9077 9078static inline bool 9079CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9080 CanQualType ExpectedResultType, 9081 CanQualType ExpectedFirstParamType, 9082 unsigned DependentParamTypeDiag, 9083 unsigned InvalidParamTypeDiag) { 9084 QualType ResultType = 9085 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9086 9087 // Check that the result type is not dependent. 9088 if (ResultType->isDependentType()) 9089 return SemaRef.Diag(FnDecl->getLocation(), 9090 diag::err_operator_new_delete_dependent_result_type) 9091 << FnDecl->getDeclName() << ExpectedResultType; 9092 9093 // Check that the result type is what we expect. 9094 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9095 return SemaRef.Diag(FnDecl->getLocation(), 9096 diag::err_operator_new_delete_invalid_result_type) 9097 << FnDecl->getDeclName() << ExpectedResultType; 9098 9099 // A function template must have at least 2 parameters. 9100 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9101 return SemaRef.Diag(FnDecl->getLocation(), 9102 diag::err_operator_new_delete_template_too_few_parameters) 9103 << FnDecl->getDeclName(); 9104 9105 // The function decl must have at least 1 parameter. 9106 if (FnDecl->getNumParams() == 0) 9107 return SemaRef.Diag(FnDecl->getLocation(), 9108 diag::err_operator_new_delete_too_few_parameters) 9109 << FnDecl->getDeclName(); 9110 9111 // Check the the first parameter type is not dependent. 9112 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9113 if (FirstParamType->isDependentType()) 9114 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9115 << FnDecl->getDeclName() << ExpectedFirstParamType; 9116 9117 // Check that the first parameter type is what we expect. 9118 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9119 ExpectedFirstParamType) 9120 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9121 << FnDecl->getDeclName() << ExpectedFirstParamType; 9122 9123 return false; 9124} 9125 9126static bool 9127CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9128 // C++ [basic.stc.dynamic.allocation]p1: 9129 // A program is ill-formed if an allocation function is declared in a 9130 // namespace scope other than global scope or declared static in global 9131 // scope. 9132 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9133 return true; 9134 9135 CanQualType SizeTy = 9136 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9137 9138 // C++ [basic.stc.dynamic.allocation]p1: 9139 // The return type shall be void*. The first parameter shall have type 9140 // std::size_t. 9141 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9142 SizeTy, 9143 diag::err_operator_new_dependent_param_type, 9144 diag::err_operator_new_param_type)) 9145 return true; 9146 9147 // C++ [basic.stc.dynamic.allocation]p1: 9148 // The first parameter shall not have an associated default argument. 9149 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9150 return SemaRef.Diag(FnDecl->getLocation(), 9151 diag::err_operator_new_default_arg) 9152 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9153 9154 return false; 9155} 9156 9157static bool 9158CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9159 // C++ [basic.stc.dynamic.deallocation]p1: 9160 // A program is ill-formed if deallocation functions are declared in a 9161 // namespace scope other than global scope or declared static in global 9162 // scope. 9163 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9164 return true; 9165 9166 // C++ [basic.stc.dynamic.deallocation]p2: 9167 // Each deallocation function shall return void and its first parameter 9168 // shall be void*. 9169 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9170 SemaRef.Context.VoidPtrTy, 9171 diag::err_operator_delete_dependent_param_type, 9172 diag::err_operator_delete_param_type)) 9173 return true; 9174 9175 return false; 9176} 9177 9178/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9179/// of this overloaded operator is well-formed. If so, returns false; 9180/// otherwise, emits appropriate diagnostics and returns true. 9181bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9182 assert(FnDecl && FnDecl->isOverloadedOperator() && 9183 "Expected an overloaded operator declaration"); 9184 9185 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9186 9187 // C++ [over.oper]p5: 9188 // The allocation and deallocation functions, operator new, 9189 // operator new[], operator delete and operator delete[], are 9190 // described completely in 3.7.3. The attributes and restrictions 9191 // found in the rest of this subclause do not apply to them unless 9192 // explicitly stated in 3.7.3. 9193 if (Op == OO_Delete || Op == OO_Array_Delete) 9194 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9195 9196 if (Op == OO_New || Op == OO_Array_New) 9197 return CheckOperatorNewDeclaration(*this, FnDecl); 9198 9199 // C++ [over.oper]p6: 9200 // An operator function shall either be a non-static member 9201 // function or be a non-member function and have at least one 9202 // parameter whose type is a class, a reference to a class, an 9203 // enumeration, or a reference to an enumeration. 9204 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9205 if (MethodDecl->isStatic()) 9206 return Diag(FnDecl->getLocation(), 9207 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9208 } else { 9209 bool ClassOrEnumParam = false; 9210 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9211 ParamEnd = FnDecl->param_end(); 9212 Param != ParamEnd; ++Param) { 9213 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9214 if (ParamType->isDependentType() || ParamType->isRecordType() || 9215 ParamType->isEnumeralType()) { 9216 ClassOrEnumParam = true; 9217 break; 9218 } 9219 } 9220 9221 if (!ClassOrEnumParam) 9222 return Diag(FnDecl->getLocation(), 9223 diag::err_operator_overload_needs_class_or_enum) 9224 << FnDecl->getDeclName(); 9225 } 9226 9227 // C++ [over.oper]p8: 9228 // An operator function cannot have default arguments (8.3.6), 9229 // except where explicitly stated below. 9230 // 9231 // Only the function-call operator allows default arguments 9232 // (C++ [over.call]p1). 9233 if (Op != OO_Call) { 9234 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9235 Param != FnDecl->param_end(); ++Param) { 9236 if ((*Param)->hasDefaultArg()) 9237 return Diag((*Param)->getLocation(), 9238 diag::err_operator_overload_default_arg) 9239 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9240 } 9241 } 9242 9243 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9244 { false, false, false } 9245#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9246 , { Unary, Binary, MemberOnly } 9247#include "clang/Basic/OperatorKinds.def" 9248 }; 9249 9250 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9251 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9252 bool MustBeMemberOperator = OperatorUses[Op][2]; 9253 9254 // C++ [over.oper]p8: 9255 // [...] Operator functions cannot have more or fewer parameters 9256 // than the number required for the corresponding operator, as 9257 // described in the rest of this subclause. 9258 unsigned NumParams = FnDecl->getNumParams() 9259 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9260 if (Op != OO_Call && 9261 ((NumParams == 1 && !CanBeUnaryOperator) || 9262 (NumParams == 2 && !CanBeBinaryOperator) || 9263 (NumParams < 1) || (NumParams > 2))) { 9264 // We have the wrong number of parameters. 9265 unsigned ErrorKind; 9266 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9267 ErrorKind = 2; // 2 -> unary or binary. 9268 } else if (CanBeUnaryOperator) { 9269 ErrorKind = 0; // 0 -> unary 9270 } else { 9271 assert(CanBeBinaryOperator && 9272 "All non-call overloaded operators are unary or binary!"); 9273 ErrorKind = 1; // 1 -> binary 9274 } 9275 9276 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9277 << FnDecl->getDeclName() << NumParams << ErrorKind; 9278 } 9279 9280 // Overloaded operators other than operator() cannot be variadic. 9281 if (Op != OO_Call && 9282 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9283 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9284 << FnDecl->getDeclName(); 9285 } 9286 9287 // Some operators must be non-static member functions. 9288 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9289 return Diag(FnDecl->getLocation(), 9290 diag::err_operator_overload_must_be_member) 9291 << FnDecl->getDeclName(); 9292 } 9293 9294 // C++ [over.inc]p1: 9295 // The user-defined function called operator++ implements the 9296 // prefix and postfix ++ operator. If this function is a member 9297 // function with no parameters, or a non-member function with one 9298 // parameter of class or enumeration type, it defines the prefix 9299 // increment operator ++ for objects of that type. If the function 9300 // is a member function with one parameter (which shall be of type 9301 // int) or a non-member function with two parameters (the second 9302 // of which shall be of type int), it defines the postfix 9303 // increment operator ++ for objects of that type. 9304 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9305 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9306 bool ParamIsInt = false; 9307 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9308 ParamIsInt = BT->getKind() == BuiltinType::Int; 9309 9310 if (!ParamIsInt) 9311 return Diag(LastParam->getLocation(), 9312 diag::err_operator_overload_post_incdec_must_be_int) 9313 << LastParam->getType() << (Op == OO_MinusMinus); 9314 } 9315 9316 return false; 9317} 9318 9319/// CheckLiteralOperatorDeclaration - Check whether the declaration 9320/// of this literal operator function is well-formed. If so, returns 9321/// false; otherwise, emits appropriate diagnostics and returns true. 9322bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9323 if (isa<CXXMethodDecl>(FnDecl)) { 9324 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9325 << FnDecl->getDeclName(); 9326 return true; 9327 } 9328 9329 if (FnDecl->isExternC()) { 9330 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 9331 return true; 9332 } 9333 9334 bool Valid = false; 9335 9336 // This might be the definition of a literal operator template. 9337 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 9338 // This might be a specialization of a literal operator template. 9339 if (!TpDecl) 9340 TpDecl = FnDecl->getPrimaryTemplate(); 9341 9342 // template <char...> type operator "" name() is the only valid template 9343 // signature, and the only valid signature with no parameters. 9344 if (TpDecl) { 9345 if (FnDecl->param_size() == 0) { 9346 // Must have only one template parameter 9347 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9348 if (Params->size() == 1) { 9349 NonTypeTemplateParmDecl *PmDecl = 9350 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9351 9352 // The template parameter must be a char parameter pack. 9353 if (PmDecl && PmDecl->isTemplateParameterPack() && 9354 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9355 Valid = true; 9356 } 9357 } 9358 } else if (FnDecl->param_size()) { 9359 // Check the first parameter 9360 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9361 9362 QualType T = (*Param)->getType().getUnqualifiedType(); 9363 9364 // unsigned long long int, long double, and any character type are allowed 9365 // as the only parameters. 9366 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9367 Context.hasSameType(T, Context.LongDoubleTy) || 9368 Context.hasSameType(T, Context.CharTy) || 9369 Context.hasSameType(T, Context.WCharTy) || 9370 Context.hasSameType(T, Context.Char16Ty) || 9371 Context.hasSameType(T, Context.Char32Ty)) { 9372 if (++Param == FnDecl->param_end()) 9373 Valid = true; 9374 goto FinishedParams; 9375 } 9376 9377 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9378 const PointerType *PT = T->getAs<PointerType>(); 9379 if (!PT) 9380 goto FinishedParams; 9381 T = PT->getPointeeType(); 9382 if (!T.isConstQualified() || T.isVolatileQualified()) 9383 goto FinishedParams; 9384 T = T.getUnqualifiedType(); 9385 9386 // Move on to the second parameter; 9387 ++Param; 9388 9389 // If there is no second parameter, the first must be a const char * 9390 if (Param == FnDecl->param_end()) { 9391 if (Context.hasSameType(T, Context.CharTy)) 9392 Valid = true; 9393 goto FinishedParams; 9394 } 9395 9396 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9397 // are allowed as the first parameter to a two-parameter function 9398 if (!(Context.hasSameType(T, Context.CharTy) || 9399 Context.hasSameType(T, Context.WCharTy) || 9400 Context.hasSameType(T, Context.Char16Ty) || 9401 Context.hasSameType(T, Context.Char32Ty))) 9402 goto FinishedParams; 9403 9404 // The second and final parameter must be an std::size_t 9405 T = (*Param)->getType().getUnqualifiedType(); 9406 if (Context.hasSameType(T, Context.getSizeType()) && 9407 ++Param == FnDecl->param_end()) 9408 Valid = true; 9409 } 9410 9411 // FIXME: This diagnostic is absolutely terrible. 9412FinishedParams: 9413 if (!Valid) { 9414 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9415 << FnDecl->getDeclName(); 9416 return true; 9417 } 9418 9419 // A parameter-declaration-clause containing a default argument is not 9420 // equivalent to any of the permitted forms. 9421 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9422 ParamEnd = FnDecl->param_end(); 9423 Param != ParamEnd; ++Param) { 9424 if ((*Param)->hasDefaultArg()) { 9425 Diag((*Param)->getDefaultArgRange().getBegin(), 9426 diag::err_literal_operator_default_argument) 9427 << (*Param)->getDefaultArgRange(); 9428 break; 9429 } 9430 } 9431 9432 StringRef LiteralName 9433 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9434 if (LiteralName[0] != '_') { 9435 // C++11 [usrlit.suffix]p1: 9436 // Literal suffix identifiers that do not start with an underscore 9437 // are reserved for future standardization. 9438 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9439 } 9440 9441 return false; 9442} 9443 9444/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9445/// linkage specification, including the language and (if present) 9446/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9447/// the location of the language string literal, which is provided 9448/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9449/// the '{' brace. Otherwise, this linkage specification does not 9450/// have any braces. 9451Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9452 SourceLocation LangLoc, 9453 StringRef Lang, 9454 SourceLocation LBraceLoc) { 9455 LinkageSpecDecl::LanguageIDs Language; 9456 if (Lang == "\"C\"") 9457 Language = LinkageSpecDecl::lang_c; 9458 else if (Lang == "\"C++\"") 9459 Language = LinkageSpecDecl::lang_cxx; 9460 else { 9461 Diag(LangLoc, diag::err_bad_language); 9462 return 0; 9463 } 9464 9465 // FIXME: Add all the various semantics of linkage specifications 9466 9467 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9468 ExternLoc, LangLoc, Language); 9469 CurContext->addDecl(D); 9470 PushDeclContext(S, D); 9471 return D; 9472} 9473 9474/// ActOnFinishLinkageSpecification - Complete the definition of 9475/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9476/// valid, it's the position of the closing '}' brace in a linkage 9477/// specification that uses braces. 9478Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9479 Decl *LinkageSpec, 9480 SourceLocation RBraceLoc) { 9481 if (LinkageSpec) { 9482 if (RBraceLoc.isValid()) { 9483 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9484 LSDecl->setRBraceLoc(RBraceLoc); 9485 } 9486 PopDeclContext(); 9487 } 9488 return LinkageSpec; 9489} 9490 9491/// \brief Perform semantic analysis for the variable declaration that 9492/// occurs within a C++ catch clause, returning the newly-created 9493/// variable. 9494VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9495 TypeSourceInfo *TInfo, 9496 SourceLocation StartLoc, 9497 SourceLocation Loc, 9498 IdentifierInfo *Name) { 9499 bool Invalid = false; 9500 QualType ExDeclType = TInfo->getType(); 9501 9502 // Arrays and functions decay. 9503 if (ExDeclType->isArrayType()) 9504 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9505 else if (ExDeclType->isFunctionType()) 9506 ExDeclType = Context.getPointerType(ExDeclType); 9507 9508 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9509 // The exception-declaration shall not denote a pointer or reference to an 9510 // incomplete type, other than [cv] void*. 9511 // N2844 forbids rvalue references. 9512 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9513 Diag(Loc, diag::err_catch_rvalue_ref); 9514 Invalid = true; 9515 } 9516 9517 QualType BaseType = ExDeclType; 9518 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9519 unsigned DK = diag::err_catch_incomplete; 9520 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9521 BaseType = Ptr->getPointeeType(); 9522 Mode = 1; 9523 DK = diag::err_catch_incomplete_ptr; 9524 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9525 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9526 BaseType = Ref->getPointeeType(); 9527 Mode = 2; 9528 DK = diag::err_catch_incomplete_ref; 9529 } 9530 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9531 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 9532 Invalid = true; 9533 9534 if (!Invalid && !ExDeclType->isDependentType() && 9535 RequireNonAbstractType(Loc, ExDeclType, 9536 diag::err_abstract_type_in_decl, 9537 AbstractVariableType)) 9538 Invalid = true; 9539 9540 // Only the non-fragile NeXT runtime currently supports C++ catches 9541 // of ObjC types, and no runtime supports catching ObjC types by value. 9542 if (!Invalid && getLangOpts().ObjC1) { 9543 QualType T = ExDeclType; 9544 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9545 T = RT->getPointeeType(); 9546 9547 if (T->isObjCObjectType()) { 9548 Diag(Loc, diag::err_objc_object_catch); 9549 Invalid = true; 9550 } else if (T->isObjCObjectPointerType()) { 9551 if (!getLangOpts().ObjCNonFragileABI) 9552 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9553 } 9554 } 9555 9556 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9557 ExDeclType, TInfo, SC_None, SC_None); 9558 ExDecl->setExceptionVariable(true); 9559 9560 // In ARC, infer 'retaining' for variables of retainable type. 9561 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9562 Invalid = true; 9563 9564 if (!Invalid && !ExDeclType->isDependentType()) { 9565 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9566 // C++ [except.handle]p16: 9567 // The object declared in an exception-declaration or, if the 9568 // exception-declaration does not specify a name, a temporary (12.2) is 9569 // copy-initialized (8.5) from the exception object. [...] 9570 // The object is destroyed when the handler exits, after the destruction 9571 // of any automatic objects initialized within the handler. 9572 // 9573 // We just pretend to initialize the object with itself, then make sure 9574 // it can be destroyed later. 9575 QualType initType = ExDeclType; 9576 9577 InitializedEntity entity = 9578 InitializedEntity::InitializeVariable(ExDecl); 9579 InitializationKind initKind = 9580 InitializationKind::CreateCopy(Loc, SourceLocation()); 9581 9582 Expr *opaqueValue = 9583 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9584 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9585 ExprResult result = sequence.Perform(*this, entity, initKind, 9586 MultiExprArg(&opaqueValue, 1)); 9587 if (result.isInvalid()) 9588 Invalid = true; 9589 else { 9590 // If the constructor used was non-trivial, set this as the 9591 // "initializer". 9592 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9593 if (!construct->getConstructor()->isTrivial()) { 9594 Expr *init = MaybeCreateExprWithCleanups(construct); 9595 ExDecl->setInit(init); 9596 } 9597 9598 // And make sure it's destructable. 9599 FinalizeVarWithDestructor(ExDecl, recordType); 9600 } 9601 } 9602 } 9603 9604 if (Invalid) 9605 ExDecl->setInvalidDecl(); 9606 9607 return ExDecl; 9608} 9609 9610/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9611/// handler. 9612Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9613 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9614 bool Invalid = D.isInvalidType(); 9615 9616 // Check for unexpanded parameter packs. 9617 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9618 UPPC_ExceptionType)) { 9619 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9620 D.getIdentifierLoc()); 9621 Invalid = true; 9622 } 9623 9624 IdentifierInfo *II = D.getIdentifier(); 9625 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9626 LookupOrdinaryName, 9627 ForRedeclaration)) { 9628 // The scope should be freshly made just for us. There is just no way 9629 // it contains any previous declaration. 9630 assert(!S->isDeclScope(PrevDecl)); 9631 if (PrevDecl->isTemplateParameter()) { 9632 // Maybe we will complain about the shadowed template parameter. 9633 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9634 PrevDecl = 0; 9635 } 9636 } 9637 9638 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9639 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9640 << D.getCXXScopeSpec().getRange(); 9641 Invalid = true; 9642 } 9643 9644 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9645 D.getLocStart(), 9646 D.getIdentifierLoc(), 9647 D.getIdentifier()); 9648 if (Invalid) 9649 ExDecl->setInvalidDecl(); 9650 9651 // Add the exception declaration into this scope. 9652 if (II) 9653 PushOnScopeChains(ExDecl, S); 9654 else 9655 CurContext->addDecl(ExDecl); 9656 9657 ProcessDeclAttributes(S, ExDecl, D); 9658 return ExDecl; 9659} 9660 9661Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9662 Expr *AssertExpr, 9663 Expr *AssertMessageExpr_, 9664 SourceLocation RParenLoc) { 9665 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9666 9667 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9668 // In a static_assert-declaration, the constant-expression shall be a 9669 // constant expression that can be contextually converted to bool. 9670 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 9671 if (Converted.isInvalid()) 9672 return 0; 9673 9674 llvm::APSInt Cond; 9675 if (VerifyIntegerConstantExpression(Converted.get(), &Cond, 9676 PDiag(diag::err_static_assert_expression_is_not_constant), 9677 /*AllowFold=*/false).isInvalid()) 9678 return 0; 9679 9680 if (!Cond) { 9681 llvm::SmallString<256> MsgBuffer; 9682 llvm::raw_svector_ostream Msg(MsgBuffer); 9683 AssertMessage->printPretty(Msg, Context, 0, getPrintingPolicy()); 9684 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9685 << Msg.str() << AssertExpr->getSourceRange(); 9686 } 9687 } 9688 9689 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9690 return 0; 9691 9692 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9693 AssertExpr, AssertMessage, RParenLoc); 9694 9695 CurContext->addDecl(Decl); 9696 return Decl; 9697} 9698 9699/// \brief Perform semantic analysis of the given friend type declaration. 9700/// 9701/// \returns A friend declaration that. 9702FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc, 9703 SourceLocation FriendLoc, 9704 TypeSourceInfo *TSInfo) { 9705 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9706 9707 QualType T = TSInfo->getType(); 9708 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9709 9710 // C++03 [class.friend]p2: 9711 // An elaborated-type-specifier shall be used in a friend declaration 9712 // for a class.* 9713 // 9714 // * The class-key of the elaborated-type-specifier is required. 9715 if (!ActiveTemplateInstantiations.empty()) { 9716 // Do not complain about the form of friend template types during 9717 // template instantiation; we will already have complained when the 9718 // template was declared. 9719 } else if (!T->isElaboratedTypeSpecifier()) { 9720 // If we evaluated the type to a record type, suggest putting 9721 // a tag in front. 9722 if (const RecordType *RT = T->getAs<RecordType>()) { 9723 RecordDecl *RD = RT->getDecl(); 9724 9725 std::string InsertionText = std::string(" ") + RD->getKindName(); 9726 9727 Diag(TypeRange.getBegin(), 9728 getLangOpts().CPlusPlus0x ? 9729 diag::warn_cxx98_compat_unelaborated_friend_type : 9730 diag::ext_unelaborated_friend_type) 9731 << (unsigned) RD->getTagKind() 9732 << T 9733 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9734 InsertionText); 9735 } else { 9736 Diag(FriendLoc, 9737 getLangOpts().CPlusPlus0x ? 9738 diag::warn_cxx98_compat_nonclass_type_friend : 9739 diag::ext_nonclass_type_friend) 9740 << T 9741 << SourceRange(FriendLoc, TypeRange.getEnd()); 9742 } 9743 } else if (T->getAs<EnumType>()) { 9744 Diag(FriendLoc, 9745 getLangOpts().CPlusPlus0x ? 9746 diag::warn_cxx98_compat_enum_friend : 9747 diag::ext_enum_friend) 9748 << T 9749 << SourceRange(FriendLoc, TypeRange.getEnd()); 9750 } 9751 9752 // C++0x [class.friend]p3: 9753 // If the type specifier in a friend declaration designates a (possibly 9754 // cv-qualified) class type, that class is declared as a friend; otherwise, 9755 // the friend declaration is ignored. 9756 9757 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9758 // in [class.friend]p3 that we do not implement. 9759 9760 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc); 9761} 9762 9763/// Handle a friend tag declaration where the scope specifier was 9764/// templated. 9765Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9766 unsigned TagSpec, SourceLocation TagLoc, 9767 CXXScopeSpec &SS, 9768 IdentifierInfo *Name, SourceLocation NameLoc, 9769 AttributeList *Attr, 9770 MultiTemplateParamsArg TempParamLists) { 9771 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9772 9773 bool isExplicitSpecialization = false; 9774 bool Invalid = false; 9775 9776 if (TemplateParameterList *TemplateParams 9777 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9778 TempParamLists.get(), 9779 TempParamLists.size(), 9780 /*friend*/ true, 9781 isExplicitSpecialization, 9782 Invalid)) { 9783 if (TemplateParams->size() > 0) { 9784 // This is a declaration of a class template. 9785 if (Invalid) 9786 return 0; 9787 9788 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9789 SS, Name, NameLoc, Attr, 9790 TemplateParams, AS_public, 9791 /*ModulePrivateLoc=*/SourceLocation(), 9792 TempParamLists.size() - 1, 9793 (TemplateParameterList**) TempParamLists.release()).take(); 9794 } else { 9795 // The "template<>" header is extraneous. 9796 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9797 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9798 isExplicitSpecialization = true; 9799 } 9800 } 9801 9802 if (Invalid) return 0; 9803 9804 bool isAllExplicitSpecializations = true; 9805 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9806 if (TempParamLists.get()[I]->size()) { 9807 isAllExplicitSpecializations = false; 9808 break; 9809 } 9810 } 9811 9812 // FIXME: don't ignore attributes. 9813 9814 // If it's explicit specializations all the way down, just forget 9815 // about the template header and build an appropriate non-templated 9816 // friend. TODO: for source fidelity, remember the headers. 9817 if (isAllExplicitSpecializations) { 9818 if (SS.isEmpty()) { 9819 bool Owned = false; 9820 bool IsDependent = false; 9821 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 9822 Attr, AS_public, 9823 /*ModulePrivateLoc=*/SourceLocation(), 9824 MultiTemplateParamsArg(), Owned, IsDependent, 9825 /*ScopedEnumKWLoc=*/SourceLocation(), 9826 /*ScopedEnumUsesClassTag=*/false, 9827 /*UnderlyingType=*/TypeResult()); 9828 } 9829 9830 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9831 ElaboratedTypeKeyword Keyword 9832 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9833 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9834 *Name, NameLoc); 9835 if (T.isNull()) 9836 return 0; 9837 9838 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9839 if (isa<DependentNameType>(T)) { 9840 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9841 TL.setElaboratedKeywordLoc(TagLoc); 9842 TL.setQualifierLoc(QualifierLoc); 9843 TL.setNameLoc(NameLoc); 9844 } else { 9845 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9846 TL.setElaboratedKeywordLoc(TagLoc); 9847 TL.setQualifierLoc(QualifierLoc); 9848 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 9849 } 9850 9851 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9852 TSI, FriendLoc); 9853 Friend->setAccess(AS_public); 9854 CurContext->addDecl(Friend); 9855 return Friend; 9856 } 9857 9858 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9859 9860 9861 9862 // Handle the case of a templated-scope friend class. e.g. 9863 // template <class T> class A<T>::B; 9864 // FIXME: we don't support these right now. 9865 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9866 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 9867 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9868 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9869 TL.setElaboratedKeywordLoc(TagLoc); 9870 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 9871 TL.setNameLoc(NameLoc); 9872 9873 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9874 TSI, FriendLoc); 9875 Friend->setAccess(AS_public); 9876 Friend->setUnsupportedFriend(true); 9877 CurContext->addDecl(Friend); 9878 return Friend; 9879} 9880 9881 9882/// Handle a friend type declaration. This works in tandem with 9883/// ActOnTag. 9884/// 9885/// Notes on friend class templates: 9886/// 9887/// We generally treat friend class declarations as if they were 9888/// declaring a class. So, for example, the elaborated type specifier 9889/// in a friend declaration is required to obey the restrictions of a 9890/// class-head (i.e. no typedefs in the scope chain), template 9891/// parameters are required to match up with simple template-ids, &c. 9892/// However, unlike when declaring a template specialization, it's 9893/// okay to refer to a template specialization without an empty 9894/// template parameter declaration, e.g. 9895/// friend class A<T>::B<unsigned>; 9896/// We permit this as a special case; if there are any template 9897/// parameters present at all, require proper matching, i.e. 9898/// template <> template <class T> friend class A<int>::B; 9899Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 9900 MultiTemplateParamsArg TempParams) { 9901 SourceLocation Loc = DS.getLocStart(); 9902 9903 assert(DS.isFriendSpecified()); 9904 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9905 9906 // Try to convert the decl specifier to a type. This works for 9907 // friend templates because ActOnTag never produces a ClassTemplateDecl 9908 // for a TUK_Friend. 9909 Declarator TheDeclarator(DS, Declarator::MemberContext); 9910 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 9911 QualType T = TSI->getType(); 9912 if (TheDeclarator.isInvalidType()) 9913 return 0; 9914 9915 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 9916 return 0; 9917 9918 // This is definitely an error in C++98. It's probably meant to 9919 // be forbidden in C++0x, too, but the specification is just 9920 // poorly written. 9921 // 9922 // The problem is with declarations like the following: 9923 // template <T> friend A<T>::foo; 9924 // where deciding whether a class C is a friend or not now hinges 9925 // on whether there exists an instantiation of A that causes 9926 // 'foo' to equal C. There are restrictions on class-heads 9927 // (which we declare (by fiat) elaborated friend declarations to 9928 // be) that makes this tractable. 9929 // 9930 // FIXME: handle "template <> friend class A<T>;", which 9931 // is possibly well-formed? Who even knows? 9932 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 9933 Diag(Loc, diag::err_tagless_friend_type_template) 9934 << DS.getSourceRange(); 9935 return 0; 9936 } 9937 9938 // C++98 [class.friend]p1: A friend of a class is a function 9939 // or class that is not a member of the class . . . 9940 // This is fixed in DR77, which just barely didn't make the C++03 9941 // deadline. It's also a very silly restriction that seriously 9942 // affects inner classes and which nobody else seems to implement; 9943 // thus we never diagnose it, not even in -pedantic. 9944 // 9945 // But note that we could warn about it: it's always useless to 9946 // friend one of your own members (it's not, however, worthless to 9947 // friend a member of an arbitrary specialization of your template). 9948 9949 Decl *D; 9950 if (unsigned NumTempParamLists = TempParams.size()) 9951 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 9952 NumTempParamLists, 9953 TempParams.release(), 9954 TSI, 9955 DS.getFriendSpecLoc()); 9956 else 9957 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 9958 9959 if (!D) 9960 return 0; 9961 9962 D->setAccess(AS_public); 9963 CurContext->addDecl(D); 9964 9965 return D; 9966} 9967 9968Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 9969 MultiTemplateParamsArg TemplateParams) { 9970 const DeclSpec &DS = D.getDeclSpec(); 9971 9972 assert(DS.isFriendSpecified()); 9973 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9974 9975 SourceLocation Loc = D.getIdentifierLoc(); 9976 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9977 9978 // C++ [class.friend]p1 9979 // A friend of a class is a function or class.... 9980 // Note that this sees through typedefs, which is intended. 9981 // It *doesn't* see through dependent types, which is correct 9982 // according to [temp.arg.type]p3: 9983 // If a declaration acquires a function type through a 9984 // type dependent on a template-parameter and this causes 9985 // a declaration that does not use the syntactic form of a 9986 // function declarator to have a function type, the program 9987 // is ill-formed. 9988 if (!TInfo->getType()->isFunctionType()) { 9989 Diag(Loc, diag::err_unexpected_friend); 9990 9991 // It might be worthwhile to try to recover by creating an 9992 // appropriate declaration. 9993 return 0; 9994 } 9995 9996 // C++ [namespace.memdef]p3 9997 // - If a friend declaration in a non-local class first declares a 9998 // class or function, the friend class or function is a member 9999 // of the innermost enclosing namespace. 10000 // - The name of the friend is not found by simple name lookup 10001 // until a matching declaration is provided in that namespace 10002 // scope (either before or after the class declaration granting 10003 // friendship). 10004 // - If a friend function is called, its name may be found by the 10005 // name lookup that considers functions from namespaces and 10006 // classes associated with the types of the function arguments. 10007 // - When looking for a prior declaration of a class or a function 10008 // declared as a friend, scopes outside the innermost enclosing 10009 // namespace scope are not considered. 10010 10011 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10012 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10013 DeclarationName Name = NameInfo.getName(); 10014 assert(Name); 10015 10016 // Check for unexpanded parameter packs. 10017 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10018 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10019 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10020 return 0; 10021 10022 // The context we found the declaration in, or in which we should 10023 // create the declaration. 10024 DeclContext *DC; 10025 Scope *DCScope = S; 10026 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10027 ForRedeclaration); 10028 10029 // FIXME: there are different rules in local classes 10030 10031 // There are four cases here. 10032 // - There's no scope specifier, in which case we just go to the 10033 // appropriate scope and look for a function or function template 10034 // there as appropriate. 10035 // Recover from invalid scope qualifiers as if they just weren't there. 10036 if (SS.isInvalid() || !SS.isSet()) { 10037 // C++0x [namespace.memdef]p3: 10038 // If the name in a friend declaration is neither qualified nor 10039 // a template-id and the declaration is a function or an 10040 // elaborated-type-specifier, the lookup to determine whether 10041 // the entity has been previously declared shall not consider 10042 // any scopes outside the innermost enclosing namespace. 10043 // C++0x [class.friend]p11: 10044 // If a friend declaration appears in a local class and the name 10045 // specified is an unqualified name, a prior declaration is 10046 // looked up without considering scopes that are outside the 10047 // innermost enclosing non-class scope. For a friend function 10048 // declaration, if there is no prior declaration, the program is 10049 // ill-formed. 10050 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10051 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10052 10053 // Find the appropriate context according to the above. 10054 DC = CurContext; 10055 while (true) { 10056 // Skip class contexts. If someone can cite chapter and verse 10057 // for this behavior, that would be nice --- it's what GCC and 10058 // EDG do, and it seems like a reasonable intent, but the spec 10059 // really only says that checks for unqualified existing 10060 // declarations should stop at the nearest enclosing namespace, 10061 // not that they should only consider the nearest enclosing 10062 // namespace. 10063 while (DC->isRecord()) 10064 DC = DC->getParent(); 10065 10066 LookupQualifiedName(Previous, DC); 10067 10068 // TODO: decide what we think about using declarations. 10069 if (isLocal || !Previous.empty()) 10070 break; 10071 10072 if (isTemplateId) { 10073 if (isa<TranslationUnitDecl>(DC)) break; 10074 } else { 10075 if (DC->isFileContext()) break; 10076 } 10077 DC = DC->getParent(); 10078 } 10079 10080 // C++ [class.friend]p1: A friend of a class is a function or 10081 // class that is not a member of the class . . . 10082 // C++11 changes this for both friend types and functions. 10083 // Most C++ 98 compilers do seem to give an error here, so 10084 // we do, too. 10085 if (!Previous.empty() && DC->Equals(CurContext)) 10086 Diag(DS.getFriendSpecLoc(), 10087 getLangOpts().CPlusPlus0x ? 10088 diag::warn_cxx98_compat_friend_is_member : 10089 diag::err_friend_is_member); 10090 10091 DCScope = getScopeForDeclContext(S, DC); 10092 10093 // C++ [class.friend]p6: 10094 // A function can be defined in a friend declaration of a class if and 10095 // only if the class is a non-local class (9.8), the function name is 10096 // unqualified, and the function has namespace scope. 10097 if (isLocal && D.isFunctionDefinition()) { 10098 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10099 } 10100 10101 // - There's a non-dependent scope specifier, in which case we 10102 // compute it and do a previous lookup there for a function 10103 // or function template. 10104 } else if (!SS.getScopeRep()->isDependent()) { 10105 DC = computeDeclContext(SS); 10106 if (!DC) return 0; 10107 10108 if (RequireCompleteDeclContext(SS, DC)) return 0; 10109 10110 LookupQualifiedName(Previous, DC); 10111 10112 // Ignore things found implicitly in the wrong scope. 10113 // TODO: better diagnostics for this case. Suggesting the right 10114 // qualified scope would be nice... 10115 LookupResult::Filter F = Previous.makeFilter(); 10116 while (F.hasNext()) { 10117 NamedDecl *D = F.next(); 10118 if (!DC->InEnclosingNamespaceSetOf( 10119 D->getDeclContext()->getRedeclContext())) 10120 F.erase(); 10121 } 10122 F.done(); 10123 10124 if (Previous.empty()) { 10125 D.setInvalidType(); 10126 Diag(Loc, diag::err_qualified_friend_not_found) 10127 << Name << TInfo->getType(); 10128 return 0; 10129 } 10130 10131 // C++ [class.friend]p1: A friend of a class is a function or 10132 // class that is not a member of the class . . . 10133 if (DC->Equals(CurContext)) 10134 Diag(DS.getFriendSpecLoc(), 10135 getLangOpts().CPlusPlus0x ? 10136 diag::warn_cxx98_compat_friend_is_member : 10137 diag::err_friend_is_member); 10138 10139 if (D.isFunctionDefinition()) { 10140 // C++ [class.friend]p6: 10141 // A function can be defined in a friend declaration of a class if and 10142 // only if the class is a non-local class (9.8), the function name is 10143 // unqualified, and the function has namespace scope. 10144 SemaDiagnosticBuilder DB 10145 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10146 10147 DB << SS.getScopeRep(); 10148 if (DC->isFileContext()) 10149 DB << FixItHint::CreateRemoval(SS.getRange()); 10150 SS.clear(); 10151 } 10152 10153 // - There's a scope specifier that does not match any template 10154 // parameter lists, in which case we use some arbitrary context, 10155 // create a method or method template, and wait for instantiation. 10156 // - There's a scope specifier that does match some template 10157 // parameter lists, which we don't handle right now. 10158 } else { 10159 if (D.isFunctionDefinition()) { 10160 // C++ [class.friend]p6: 10161 // A function can be defined in a friend declaration of a class if and 10162 // only if the class is a non-local class (9.8), the function name is 10163 // unqualified, and the function has namespace scope. 10164 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10165 << SS.getScopeRep(); 10166 } 10167 10168 DC = CurContext; 10169 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10170 } 10171 10172 if (!DC->isRecord()) { 10173 // This implies that it has to be an operator or function. 10174 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10175 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10176 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10177 Diag(Loc, diag::err_introducing_special_friend) << 10178 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10179 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10180 return 0; 10181 } 10182 } 10183 10184 // FIXME: This is an egregious hack to cope with cases where the scope stack 10185 // does not contain the declaration context, i.e., in an out-of-line 10186 // definition of a class. 10187 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10188 if (!DCScope) { 10189 FakeDCScope.setEntity(DC); 10190 DCScope = &FakeDCScope; 10191 } 10192 10193 bool AddToScope = true; 10194 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10195 move(TemplateParams), AddToScope); 10196 if (!ND) return 0; 10197 10198 assert(ND->getDeclContext() == DC); 10199 assert(ND->getLexicalDeclContext() == CurContext); 10200 10201 // Add the function declaration to the appropriate lookup tables, 10202 // adjusting the redeclarations list as necessary. We don't 10203 // want to do this yet if the friending class is dependent. 10204 // 10205 // Also update the scope-based lookup if the target context's 10206 // lookup context is in lexical scope. 10207 if (!CurContext->isDependentContext()) { 10208 DC = DC->getRedeclContext(); 10209 DC->makeDeclVisibleInContext(ND); 10210 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10211 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10212 } 10213 10214 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10215 D.getIdentifierLoc(), ND, 10216 DS.getFriendSpecLoc()); 10217 FrD->setAccess(AS_public); 10218 CurContext->addDecl(FrD); 10219 10220 if (ND->isInvalidDecl()) 10221 FrD->setInvalidDecl(); 10222 else { 10223 FunctionDecl *FD; 10224 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10225 FD = FTD->getTemplatedDecl(); 10226 else 10227 FD = cast<FunctionDecl>(ND); 10228 10229 // Mark templated-scope function declarations as unsupported. 10230 if (FD->getNumTemplateParameterLists()) 10231 FrD->setUnsupportedFriend(true); 10232 } 10233 10234 return ND; 10235} 10236 10237void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10238 AdjustDeclIfTemplate(Dcl); 10239 10240 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10241 if (!Fn) { 10242 Diag(DelLoc, diag::err_deleted_non_function); 10243 return; 10244 } 10245 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10246 Diag(DelLoc, diag::err_deleted_decl_not_first); 10247 Diag(Prev->getLocation(), diag::note_previous_declaration); 10248 // If the declaration wasn't the first, we delete the function anyway for 10249 // recovery. 10250 } 10251 Fn->setDeletedAsWritten(); 10252 10253 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10254 if (!MD) 10255 return; 10256 10257 // A deleted special member function is trivial if the corresponding 10258 // implicitly-declared function would have been. 10259 switch (getSpecialMember(MD)) { 10260 case CXXInvalid: 10261 break; 10262 case CXXDefaultConstructor: 10263 MD->setTrivial(MD->getParent()->hasTrivialDefaultConstructor()); 10264 break; 10265 case CXXCopyConstructor: 10266 MD->setTrivial(MD->getParent()->hasTrivialCopyConstructor()); 10267 break; 10268 case CXXMoveConstructor: 10269 MD->setTrivial(MD->getParent()->hasTrivialMoveConstructor()); 10270 break; 10271 case CXXCopyAssignment: 10272 MD->setTrivial(MD->getParent()->hasTrivialCopyAssignment()); 10273 break; 10274 case CXXMoveAssignment: 10275 MD->setTrivial(MD->getParent()->hasTrivialMoveAssignment()); 10276 break; 10277 case CXXDestructor: 10278 MD->setTrivial(MD->getParent()->hasTrivialDestructor()); 10279 break; 10280 } 10281} 10282 10283void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10284 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10285 10286 if (MD) { 10287 if (MD->getParent()->isDependentType()) { 10288 MD->setDefaulted(); 10289 MD->setExplicitlyDefaulted(); 10290 return; 10291 } 10292 10293 CXXSpecialMember Member = getSpecialMember(MD); 10294 if (Member == CXXInvalid) { 10295 Diag(DefaultLoc, diag::err_default_special_members); 10296 return; 10297 } 10298 10299 MD->setDefaulted(); 10300 MD->setExplicitlyDefaulted(); 10301 10302 // If this definition appears within the record, do the checking when 10303 // the record is complete. 10304 const FunctionDecl *Primary = MD; 10305 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10306 // Find the uninstantiated declaration that actually had the '= default' 10307 // on it. 10308 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10309 10310 if (Primary == Primary->getCanonicalDecl()) 10311 return; 10312 10313 switch (Member) { 10314 case CXXDefaultConstructor: { 10315 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10316 CheckExplicitlyDefaultedDefaultConstructor(CD); 10317 if (!CD->isInvalidDecl()) 10318 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10319 break; 10320 } 10321 10322 case CXXCopyConstructor: { 10323 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10324 CheckExplicitlyDefaultedCopyConstructor(CD); 10325 if (!CD->isInvalidDecl()) 10326 DefineImplicitCopyConstructor(DefaultLoc, CD); 10327 break; 10328 } 10329 10330 case CXXCopyAssignment: { 10331 CheckExplicitlyDefaultedCopyAssignment(MD); 10332 if (!MD->isInvalidDecl()) 10333 DefineImplicitCopyAssignment(DefaultLoc, MD); 10334 break; 10335 } 10336 10337 case CXXDestructor: { 10338 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10339 CheckExplicitlyDefaultedDestructor(DD); 10340 if (!DD->isInvalidDecl()) 10341 DefineImplicitDestructor(DefaultLoc, DD); 10342 break; 10343 } 10344 10345 case CXXMoveConstructor: { 10346 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10347 CheckExplicitlyDefaultedMoveConstructor(CD); 10348 if (!CD->isInvalidDecl()) 10349 DefineImplicitMoveConstructor(DefaultLoc, CD); 10350 break; 10351 } 10352 10353 case CXXMoveAssignment: { 10354 CheckExplicitlyDefaultedMoveAssignment(MD); 10355 if (!MD->isInvalidDecl()) 10356 DefineImplicitMoveAssignment(DefaultLoc, MD); 10357 break; 10358 } 10359 10360 case CXXInvalid: 10361 llvm_unreachable("Invalid special member."); 10362 } 10363 } else { 10364 Diag(DefaultLoc, diag::err_default_special_members); 10365 } 10366} 10367 10368static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10369 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10370 Stmt *SubStmt = *CI; 10371 if (!SubStmt) 10372 continue; 10373 if (isa<ReturnStmt>(SubStmt)) 10374 Self.Diag(SubStmt->getLocStart(), 10375 diag::err_return_in_constructor_handler); 10376 if (!isa<Expr>(SubStmt)) 10377 SearchForReturnInStmt(Self, SubStmt); 10378 } 10379} 10380 10381void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10382 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10383 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10384 SearchForReturnInStmt(*this, Handler); 10385 } 10386} 10387 10388bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10389 const CXXMethodDecl *Old) { 10390 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10391 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10392 10393 if (Context.hasSameType(NewTy, OldTy) || 10394 NewTy->isDependentType() || OldTy->isDependentType()) 10395 return false; 10396 10397 // Check if the return types are covariant 10398 QualType NewClassTy, OldClassTy; 10399 10400 /// Both types must be pointers or references to classes. 10401 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10402 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10403 NewClassTy = NewPT->getPointeeType(); 10404 OldClassTy = OldPT->getPointeeType(); 10405 } 10406 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10407 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10408 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10409 NewClassTy = NewRT->getPointeeType(); 10410 OldClassTy = OldRT->getPointeeType(); 10411 } 10412 } 10413 } 10414 10415 // The return types aren't either both pointers or references to a class type. 10416 if (NewClassTy.isNull()) { 10417 Diag(New->getLocation(), 10418 diag::err_different_return_type_for_overriding_virtual_function) 10419 << New->getDeclName() << NewTy << OldTy; 10420 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10421 10422 return true; 10423 } 10424 10425 // C++ [class.virtual]p6: 10426 // If the return type of D::f differs from the return type of B::f, the 10427 // class type in the return type of D::f shall be complete at the point of 10428 // declaration of D::f or shall be the class type D. 10429 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10430 if (!RT->isBeingDefined() && 10431 RequireCompleteType(New->getLocation(), NewClassTy, 10432 PDiag(diag::err_covariant_return_incomplete) 10433 << New->getDeclName())) 10434 return true; 10435 } 10436 10437 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10438 // Check if the new class derives from the old class. 10439 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10440 Diag(New->getLocation(), 10441 diag::err_covariant_return_not_derived) 10442 << New->getDeclName() << NewTy << OldTy; 10443 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10444 return true; 10445 } 10446 10447 // Check if we the conversion from derived to base is valid. 10448 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10449 diag::err_covariant_return_inaccessible_base, 10450 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10451 // FIXME: Should this point to the return type? 10452 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10453 // FIXME: this note won't trigger for delayed access control 10454 // diagnostics, and it's impossible to get an undelayed error 10455 // here from access control during the original parse because 10456 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10457 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10458 return true; 10459 } 10460 } 10461 10462 // The qualifiers of the return types must be the same. 10463 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10464 Diag(New->getLocation(), 10465 diag::err_covariant_return_type_different_qualifications) 10466 << New->getDeclName() << NewTy << OldTy; 10467 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10468 return true; 10469 }; 10470 10471 10472 // The new class type must have the same or less qualifiers as the old type. 10473 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10474 Diag(New->getLocation(), 10475 diag::err_covariant_return_type_class_type_more_qualified) 10476 << New->getDeclName() << NewTy << OldTy; 10477 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10478 return true; 10479 }; 10480 10481 return false; 10482} 10483 10484/// \brief Mark the given method pure. 10485/// 10486/// \param Method the method to be marked pure. 10487/// 10488/// \param InitRange the source range that covers the "0" initializer. 10489bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10490 SourceLocation EndLoc = InitRange.getEnd(); 10491 if (EndLoc.isValid()) 10492 Method->setRangeEnd(EndLoc); 10493 10494 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10495 Method->setPure(); 10496 return false; 10497 } 10498 10499 if (!Method->isInvalidDecl()) 10500 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10501 << Method->getDeclName() << InitRange; 10502 return true; 10503} 10504 10505/// \brief Determine whether the given declaration is a static data member. 10506static bool isStaticDataMember(Decl *D) { 10507 VarDecl *Var = dyn_cast_or_null<VarDecl>(D); 10508 if (!Var) 10509 return false; 10510 10511 return Var->isStaticDataMember(); 10512} 10513/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10514/// an initializer for the out-of-line declaration 'Dcl'. The scope 10515/// is a fresh scope pushed for just this purpose. 10516/// 10517/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10518/// static data member of class X, names should be looked up in the scope of 10519/// class X. 10520void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10521 // If there is no declaration, there was an error parsing it. 10522 if (D == 0 || D->isInvalidDecl()) return; 10523 10524 // We should only get called for declarations with scope specifiers, like: 10525 // int foo::bar; 10526 assert(D->isOutOfLine()); 10527 EnterDeclaratorContext(S, D->getDeclContext()); 10528 10529 // If we are parsing the initializer for a static data member, push a 10530 // new expression evaluation context that is associated with this static 10531 // data member. 10532 if (isStaticDataMember(D)) 10533 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 10534} 10535 10536/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10537/// initializer for the out-of-line declaration 'D'. 10538void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10539 // If there is no declaration, there was an error parsing it. 10540 if (D == 0 || D->isInvalidDecl()) return; 10541 10542 if (isStaticDataMember(D)) 10543 PopExpressionEvaluationContext(); 10544 10545 assert(D->isOutOfLine()); 10546 ExitDeclaratorContext(S); 10547} 10548 10549/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10550/// C++ if/switch/while/for statement. 10551/// e.g: "if (int x = f()) {...}" 10552DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10553 // C++ 6.4p2: 10554 // The declarator shall not specify a function or an array. 10555 // The type-specifier-seq shall not contain typedef and shall not declare a 10556 // new class or enumeration. 10557 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10558 "Parser allowed 'typedef' as storage class of condition decl."); 10559 10560 Decl *Dcl = ActOnDeclarator(S, D); 10561 if (!Dcl) 10562 return true; 10563 10564 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10565 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10566 << D.getSourceRange(); 10567 return true; 10568 } 10569 10570 return Dcl; 10571} 10572 10573void Sema::LoadExternalVTableUses() { 10574 if (!ExternalSource) 10575 return; 10576 10577 SmallVector<ExternalVTableUse, 4> VTables; 10578 ExternalSource->ReadUsedVTables(VTables); 10579 SmallVector<VTableUse, 4> NewUses; 10580 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10581 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10582 = VTablesUsed.find(VTables[I].Record); 10583 // Even if a definition wasn't required before, it may be required now. 10584 if (Pos != VTablesUsed.end()) { 10585 if (!Pos->second && VTables[I].DefinitionRequired) 10586 Pos->second = true; 10587 continue; 10588 } 10589 10590 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10591 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10592 } 10593 10594 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10595} 10596 10597void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10598 bool DefinitionRequired) { 10599 // Ignore any vtable uses in unevaluated operands or for classes that do 10600 // not have a vtable. 10601 if (!Class->isDynamicClass() || Class->isDependentContext() || 10602 CurContext->isDependentContext() || 10603 ExprEvalContexts.back().Context == Unevaluated) 10604 return; 10605 10606 // Try to insert this class into the map. 10607 LoadExternalVTableUses(); 10608 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10609 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10610 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10611 if (!Pos.second) { 10612 // If we already had an entry, check to see if we are promoting this vtable 10613 // to required a definition. If so, we need to reappend to the VTableUses 10614 // list, since we may have already processed the first entry. 10615 if (DefinitionRequired && !Pos.first->second) { 10616 Pos.first->second = true; 10617 } else { 10618 // Otherwise, we can early exit. 10619 return; 10620 } 10621 } 10622 10623 // Local classes need to have their virtual members marked 10624 // immediately. For all other classes, we mark their virtual members 10625 // at the end of the translation unit. 10626 if (Class->isLocalClass()) 10627 MarkVirtualMembersReferenced(Loc, Class); 10628 else 10629 VTableUses.push_back(std::make_pair(Class, Loc)); 10630} 10631 10632bool Sema::DefineUsedVTables() { 10633 LoadExternalVTableUses(); 10634 if (VTableUses.empty()) 10635 return false; 10636 10637 // Note: The VTableUses vector could grow as a result of marking 10638 // the members of a class as "used", so we check the size each 10639 // time through the loop and prefer indices (with are stable) to 10640 // iterators (which are not). 10641 bool DefinedAnything = false; 10642 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10643 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10644 if (!Class) 10645 continue; 10646 10647 SourceLocation Loc = VTableUses[I].second; 10648 10649 // If this class has a key function, but that key function is 10650 // defined in another translation unit, we don't need to emit the 10651 // vtable even though we're using it. 10652 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10653 if (KeyFunction && !KeyFunction->hasBody()) { 10654 switch (KeyFunction->getTemplateSpecializationKind()) { 10655 case TSK_Undeclared: 10656 case TSK_ExplicitSpecialization: 10657 case TSK_ExplicitInstantiationDeclaration: 10658 // The key function is in another translation unit. 10659 continue; 10660 10661 case TSK_ExplicitInstantiationDefinition: 10662 case TSK_ImplicitInstantiation: 10663 // We will be instantiating the key function. 10664 break; 10665 } 10666 } else if (!KeyFunction) { 10667 // If we have a class with no key function that is the subject 10668 // of an explicit instantiation declaration, suppress the 10669 // vtable; it will live with the explicit instantiation 10670 // definition. 10671 bool IsExplicitInstantiationDeclaration 10672 = Class->getTemplateSpecializationKind() 10673 == TSK_ExplicitInstantiationDeclaration; 10674 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10675 REnd = Class->redecls_end(); 10676 R != REnd; ++R) { 10677 TemplateSpecializationKind TSK 10678 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10679 if (TSK == TSK_ExplicitInstantiationDeclaration) 10680 IsExplicitInstantiationDeclaration = true; 10681 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10682 IsExplicitInstantiationDeclaration = false; 10683 break; 10684 } 10685 } 10686 10687 if (IsExplicitInstantiationDeclaration) 10688 continue; 10689 } 10690 10691 // Mark all of the virtual members of this class as referenced, so 10692 // that we can build a vtable. Then, tell the AST consumer that a 10693 // vtable for this class is required. 10694 DefinedAnything = true; 10695 MarkVirtualMembersReferenced(Loc, Class); 10696 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10697 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10698 10699 // Optionally warn if we're emitting a weak vtable. 10700 if (Class->getLinkage() == ExternalLinkage && 10701 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10702 const FunctionDecl *KeyFunctionDef = 0; 10703 if (!KeyFunction || 10704 (KeyFunction->hasBody(KeyFunctionDef) && 10705 KeyFunctionDef->isInlined())) 10706 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10707 TSK_ExplicitInstantiationDefinition 10708 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10709 << Class; 10710 } 10711 } 10712 VTableUses.clear(); 10713 10714 return DefinedAnything; 10715} 10716 10717void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10718 const CXXRecordDecl *RD) { 10719 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10720 e = RD->method_end(); i != e; ++i) { 10721 CXXMethodDecl *MD = *i; 10722 10723 // C++ [basic.def.odr]p2: 10724 // [...] A virtual member function is used if it is not pure. [...] 10725 if (MD->isVirtual() && !MD->isPure()) 10726 MarkFunctionReferenced(Loc, MD); 10727 } 10728 10729 // Only classes that have virtual bases need a VTT. 10730 if (RD->getNumVBases() == 0) 10731 return; 10732 10733 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10734 e = RD->bases_end(); i != e; ++i) { 10735 const CXXRecordDecl *Base = 10736 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10737 if (Base->getNumVBases() == 0) 10738 continue; 10739 MarkVirtualMembersReferenced(Loc, Base); 10740 } 10741} 10742 10743/// SetIvarInitializers - This routine builds initialization ASTs for the 10744/// Objective-C implementation whose ivars need be initialized. 10745void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10746 if (!getLangOpts().CPlusPlus) 10747 return; 10748 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10749 SmallVector<ObjCIvarDecl*, 8> ivars; 10750 CollectIvarsToConstructOrDestruct(OID, ivars); 10751 if (ivars.empty()) 10752 return; 10753 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10754 for (unsigned i = 0; i < ivars.size(); i++) { 10755 FieldDecl *Field = ivars[i]; 10756 if (Field->isInvalidDecl()) 10757 continue; 10758 10759 CXXCtorInitializer *Member; 10760 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10761 InitializationKind InitKind = 10762 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10763 10764 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10765 ExprResult MemberInit = 10766 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10767 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10768 // Note, MemberInit could actually come back empty if no initialization 10769 // is required (e.g., because it would call a trivial default constructor) 10770 if (!MemberInit.get() || MemberInit.isInvalid()) 10771 continue; 10772 10773 Member = 10774 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10775 SourceLocation(), 10776 MemberInit.takeAs<Expr>(), 10777 SourceLocation()); 10778 AllToInit.push_back(Member); 10779 10780 // Be sure that the destructor is accessible and is marked as referenced. 10781 if (const RecordType *RecordTy 10782 = Context.getBaseElementType(Field->getType()) 10783 ->getAs<RecordType>()) { 10784 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10785 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10786 MarkFunctionReferenced(Field->getLocation(), Destructor); 10787 CheckDestructorAccess(Field->getLocation(), Destructor, 10788 PDiag(diag::err_access_dtor_ivar) 10789 << Context.getBaseElementType(Field->getType())); 10790 } 10791 } 10792 } 10793 ObjCImplementation->setIvarInitializers(Context, 10794 AllToInit.data(), AllToInit.size()); 10795 } 10796} 10797 10798static 10799void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10800 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10801 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10802 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10803 Sema &S) { 10804 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10805 CE = Current.end(); 10806 if (Ctor->isInvalidDecl()) 10807 return; 10808 10809 const FunctionDecl *FNTarget = 0; 10810 CXXConstructorDecl *Target; 10811 10812 // We ignore the result here since if we don't have a body, Target will be 10813 // null below. 10814 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10815 Target 10816= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10817 10818 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10819 // Avoid dereferencing a null pointer here. 10820 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10821 10822 if (!Current.insert(Canonical)) 10823 return; 10824 10825 // We know that beyond here, we aren't chaining into a cycle. 10826 if (!Target || !Target->isDelegatingConstructor() || 10827 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10828 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10829 Valid.insert(*CI); 10830 Current.clear(); 10831 // We've hit a cycle. 10832 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 10833 Current.count(TCanonical)) { 10834 // If we haven't diagnosed this cycle yet, do so now. 10835 if (!Invalid.count(TCanonical)) { 10836 S.Diag((*Ctor->init_begin())->getSourceLocation(), 10837 diag::warn_delegating_ctor_cycle) 10838 << Ctor; 10839 10840 // Don't add a note for a function delegating directo to itself. 10841 if (TCanonical != Canonical) 10842 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 10843 10844 CXXConstructorDecl *C = Target; 10845 while (C->getCanonicalDecl() != Canonical) { 10846 (void)C->getTargetConstructor()->hasBody(FNTarget); 10847 assert(FNTarget && "Ctor cycle through bodiless function"); 10848 10849 C 10850 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 10851 S.Diag(C->getLocation(), diag::note_which_delegates_to); 10852 } 10853 } 10854 10855 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10856 Invalid.insert(*CI); 10857 Current.clear(); 10858 } else { 10859 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 10860 } 10861} 10862 10863 10864void Sema::CheckDelegatingCtorCycles() { 10865 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 10866 10867 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10868 CE = Current.end(); 10869 10870 for (DelegatingCtorDeclsType::iterator 10871 I = DelegatingCtorDecls.begin(ExternalSource), 10872 E = DelegatingCtorDecls.end(); 10873 I != E; ++I) { 10874 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 10875 } 10876 10877 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 10878 (*CI)->setInvalidDecl(); 10879} 10880 10881/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 10882Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 10883 // Implicitly declared functions (e.g. copy constructors) are 10884 // __host__ __device__ 10885 if (D->isImplicit()) 10886 return CFT_HostDevice; 10887 10888 if (D->hasAttr<CUDAGlobalAttr>()) 10889 return CFT_Global; 10890 10891 if (D->hasAttr<CUDADeviceAttr>()) { 10892 if (D->hasAttr<CUDAHostAttr>()) 10893 return CFT_HostDevice; 10894 else 10895 return CFT_Device; 10896 } 10897 10898 return CFT_Host; 10899} 10900 10901bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 10902 CUDAFunctionTarget CalleeTarget) { 10903 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 10904 // Callable from the device only." 10905 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 10906 return true; 10907 10908 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 10909 // Callable from the host only." 10910 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 10911 // Callable from the host only." 10912 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 10913 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 10914 return true; 10915 10916 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 10917 return true; 10918 10919 return false; 10920} 10921