SemaDeclCXX.cpp revision 74e2fc332e07c76d4e69ccbd0e9e47a0bafd3908
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/RecursiveASTVisitor.h" 29#include "clang/AST/StmtVisitor.h" 30#include "clang/AST/TypeLoc.h" 31#include "clang/AST/TypeOrdering.h" 32#include "clang/Sema/DeclSpec.h" 33#include "clang/Sema/ParsedTemplate.h" 34#include "clang/Basic/PartialDiagnostic.h" 35#include "clang/Lex/Preprocessor.h" 36#include "llvm/ADT/SmallString.h" 37#include "llvm/ADT/STLExtras.h" 38#include <map> 39#include <set> 40 41using namespace clang; 42 43//===----------------------------------------------------------------------===// 44// CheckDefaultArgumentVisitor 45//===----------------------------------------------------------------------===// 46 47namespace { 48 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 49 /// the default argument of a parameter to determine whether it 50 /// contains any ill-formed subexpressions. For example, this will 51 /// diagnose the use of local variables or parameters within the 52 /// default argument expression. 53 class CheckDefaultArgumentVisitor 54 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 55 Expr *DefaultArg; 56 Sema *S; 57 58 public: 59 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 60 : DefaultArg(defarg), S(s) {} 61 62 bool VisitExpr(Expr *Node); 63 bool VisitDeclRefExpr(DeclRefExpr *DRE); 64 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 65 bool VisitLambdaExpr(LambdaExpr *Lambda); 66 }; 67 68 /// VisitExpr - Visit all of the children of this expression. 69 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 70 bool IsInvalid = false; 71 for (Stmt::child_range I = Node->children(); I; ++I) 72 IsInvalid |= Visit(*I); 73 return IsInvalid; 74 } 75 76 /// VisitDeclRefExpr - Visit a reference to a declaration, to 77 /// determine whether this declaration can be used in the default 78 /// argument expression. 79 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 80 NamedDecl *Decl = DRE->getDecl(); 81 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 82 // C++ [dcl.fct.default]p9 83 // Default arguments are evaluated each time the function is 84 // called. The order of evaluation of function arguments is 85 // unspecified. Consequently, parameters of a function shall not 86 // be used in default argument expressions, even if they are not 87 // evaluated. Parameters of a function declared before a default 88 // argument expression are in scope and can hide namespace and 89 // class member names. 90 return S->Diag(DRE->getLocStart(), 91 diag::err_param_default_argument_references_param) 92 << Param->getDeclName() << DefaultArg->getSourceRange(); 93 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 94 // C++ [dcl.fct.default]p7 95 // Local variables shall not be used in default argument 96 // expressions. 97 if (VDecl->isLocalVarDecl()) 98 return S->Diag(DRE->getLocStart(), 99 diag::err_param_default_argument_references_local) 100 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 101 } 102 103 return false; 104 } 105 106 /// VisitCXXThisExpr - Visit a C++ "this" expression. 107 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 108 // C++ [dcl.fct.default]p8: 109 // The keyword this shall not be used in a default argument of a 110 // member function. 111 return S->Diag(ThisE->getLocStart(), 112 diag::err_param_default_argument_references_this) 113 << ThisE->getSourceRange(); 114 } 115 116 bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) { 117 // C++11 [expr.lambda.prim]p13: 118 // A lambda-expression appearing in a default argument shall not 119 // implicitly or explicitly capture any entity. 120 if (Lambda->capture_begin() == Lambda->capture_end()) 121 return false; 122 123 return S->Diag(Lambda->getLocStart(), 124 diag::err_lambda_capture_default_arg); 125 } 126} 127 128void Sema::ImplicitExceptionSpecification::CalledDecl(CXXMethodDecl *Method) { 129 assert(Context && "ImplicitExceptionSpecification without an ASTContext"); 130 // If we have an MSAny or unknown spec already, don't bother. 131 if (!Method || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 132 return; 133 134 const FunctionProtoType *Proto 135 = Method->getType()->getAs<FunctionProtoType>(); 136 137 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 138 139 // If this function can throw any exceptions, make a note of that. 140 if (EST == EST_Delayed || EST == EST_MSAny || EST == EST_None) { 141 ClearExceptions(); 142 ComputedEST = EST; 143 return; 144 } 145 146 // FIXME: If the call to this decl is using any of its default arguments, we 147 // need to search them for potentially-throwing calls. 148 149 // If this function has a basic noexcept, it doesn't affect the outcome. 150 if (EST == EST_BasicNoexcept) 151 return; 152 153 // If we have a throw-all spec at this point, ignore the function. 154 if (ComputedEST == EST_None) 155 return; 156 157 // If we're still at noexcept(true) and there's a nothrow() callee, 158 // change to that specification. 159 if (EST == EST_DynamicNone) { 160 if (ComputedEST == EST_BasicNoexcept) 161 ComputedEST = EST_DynamicNone; 162 return; 163 } 164 165 // Check out noexcept specs. 166 if (EST == EST_ComputedNoexcept) { 167 FunctionProtoType::NoexceptResult NR = Proto->getNoexceptSpec(*Context); 168 assert(NR != FunctionProtoType::NR_NoNoexcept && 169 "Must have noexcept result for EST_ComputedNoexcept."); 170 assert(NR != FunctionProtoType::NR_Dependent && 171 "Should not generate implicit declarations for dependent cases, " 172 "and don't know how to handle them anyway."); 173 174 // noexcept(false) -> no spec on the new function 175 if (NR == FunctionProtoType::NR_Throw) { 176 ClearExceptions(); 177 ComputedEST = EST_None; 178 } 179 // noexcept(true) won't change anything either. 180 return; 181 } 182 183 assert(EST == EST_Dynamic && "EST case not considered earlier."); 184 assert(ComputedEST != EST_None && 185 "Shouldn't collect exceptions when throw-all is guaranteed."); 186 ComputedEST = EST_Dynamic; 187 // Record the exceptions in this function's exception specification. 188 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 189 EEnd = Proto->exception_end(); 190 E != EEnd; ++E) 191 if (ExceptionsSeen.insert(Context->getCanonicalType(*E))) 192 Exceptions.push_back(*E); 193} 194 195void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 196 if (!E || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 197 return; 198 199 // FIXME: 200 // 201 // C++0x [except.spec]p14: 202 // [An] implicit exception-specification specifies the type-id T if and 203 // only if T is allowed by the exception-specification of a function directly 204 // invoked by f's implicit definition; f shall allow all exceptions if any 205 // function it directly invokes allows all exceptions, and f shall allow no 206 // exceptions if every function it directly invokes allows no exceptions. 207 // 208 // Note in particular that if an implicit exception-specification is generated 209 // for a function containing a throw-expression, that specification can still 210 // be noexcept(true). 211 // 212 // Note also that 'directly invoked' is not defined in the standard, and there 213 // is no indication that we should only consider potentially-evaluated calls. 214 // 215 // Ultimately we should implement the intent of the standard: the exception 216 // specification should be the set of exceptions which can be thrown by the 217 // implicit definition. For now, we assume that any non-nothrow expression can 218 // throw any exception. 219 220 if (E->CanThrow(*Context)) 221 ComputedEST = EST_None; 222} 223 224bool 225Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 226 SourceLocation EqualLoc) { 227 if (RequireCompleteType(Param->getLocation(), Param->getType(), 228 diag::err_typecheck_decl_incomplete_type)) { 229 Param->setInvalidDecl(); 230 return true; 231 } 232 233 // C++ [dcl.fct.default]p5 234 // A default argument expression is implicitly converted (clause 235 // 4) to the parameter type. The default argument expression has 236 // the same semantic constraints as the initializer expression in 237 // a declaration of a variable of the parameter type, using the 238 // copy-initialization semantics (8.5). 239 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 240 Param); 241 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 242 EqualLoc); 243 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 244 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 245 MultiExprArg(*this, &Arg, 1)); 246 if (Result.isInvalid()) 247 return true; 248 Arg = Result.takeAs<Expr>(); 249 250 CheckImplicitConversions(Arg, EqualLoc); 251 Arg = MaybeCreateExprWithCleanups(Arg); 252 253 // Okay: add the default argument to the parameter 254 Param->setDefaultArg(Arg); 255 256 // We have already instantiated this parameter; provide each of the 257 // instantiations with the uninstantiated default argument. 258 UnparsedDefaultArgInstantiationsMap::iterator InstPos 259 = UnparsedDefaultArgInstantiations.find(Param); 260 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 261 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 262 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 263 264 // We're done tracking this parameter's instantiations. 265 UnparsedDefaultArgInstantiations.erase(InstPos); 266 } 267 268 return false; 269} 270 271/// ActOnParamDefaultArgument - Check whether the default argument 272/// provided for a function parameter is well-formed. If so, attach it 273/// to the parameter declaration. 274void 275Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 276 Expr *DefaultArg) { 277 if (!param || !DefaultArg) 278 return; 279 280 ParmVarDecl *Param = cast<ParmVarDecl>(param); 281 UnparsedDefaultArgLocs.erase(Param); 282 283 // Default arguments are only permitted in C++ 284 if (!getLangOpts().CPlusPlus) { 285 Diag(EqualLoc, diag::err_param_default_argument) 286 << DefaultArg->getSourceRange(); 287 Param->setInvalidDecl(); 288 return; 289 } 290 291 // Check for unexpanded parameter packs. 292 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 293 Param->setInvalidDecl(); 294 return; 295 } 296 297 // Check that the default argument is well-formed 298 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 299 if (DefaultArgChecker.Visit(DefaultArg)) { 300 Param->setInvalidDecl(); 301 return; 302 } 303 304 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 305} 306 307/// ActOnParamUnparsedDefaultArgument - We've seen a default 308/// argument for a function parameter, but we can't parse it yet 309/// because we're inside a class definition. Note that this default 310/// argument will be parsed later. 311void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 312 SourceLocation EqualLoc, 313 SourceLocation ArgLoc) { 314 if (!param) 315 return; 316 317 ParmVarDecl *Param = cast<ParmVarDecl>(param); 318 if (Param) 319 Param->setUnparsedDefaultArg(); 320 321 UnparsedDefaultArgLocs[Param] = ArgLoc; 322} 323 324/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 325/// the default argument for the parameter param failed. 326void Sema::ActOnParamDefaultArgumentError(Decl *param) { 327 if (!param) 328 return; 329 330 ParmVarDecl *Param = cast<ParmVarDecl>(param); 331 332 Param->setInvalidDecl(); 333 334 UnparsedDefaultArgLocs.erase(Param); 335} 336 337/// CheckExtraCXXDefaultArguments - Check for any extra default 338/// arguments in the declarator, which is not a function declaration 339/// or definition and therefore is not permitted to have default 340/// arguments. This routine should be invoked for every declarator 341/// that is not a function declaration or definition. 342void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 343 // C++ [dcl.fct.default]p3 344 // A default argument expression shall be specified only in the 345 // parameter-declaration-clause of a function declaration or in a 346 // template-parameter (14.1). It shall not be specified for a 347 // parameter pack. If it is specified in a 348 // parameter-declaration-clause, it shall not occur within a 349 // declarator or abstract-declarator of a parameter-declaration. 350 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 351 DeclaratorChunk &chunk = D.getTypeObject(i); 352 if (chunk.Kind == DeclaratorChunk::Function) { 353 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 354 ParmVarDecl *Param = 355 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 356 if (Param->hasUnparsedDefaultArg()) { 357 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 358 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 359 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 360 delete Toks; 361 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 362 } else if (Param->getDefaultArg()) { 363 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 364 << Param->getDefaultArg()->getSourceRange(); 365 Param->setDefaultArg(0); 366 } 367 } 368 } 369 } 370} 371 372// MergeCXXFunctionDecl - Merge two declarations of the same C++ 373// function, once we already know that they have the same 374// type. Subroutine of MergeFunctionDecl. Returns true if there was an 375// error, false otherwise. 376bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old, 377 Scope *S) { 378 bool Invalid = false; 379 380 // C++ [dcl.fct.default]p4: 381 // For non-template functions, default arguments can be added in 382 // later declarations of a function in the same 383 // scope. Declarations in different scopes have completely 384 // distinct sets of default arguments. That is, declarations in 385 // inner scopes do not acquire default arguments from 386 // declarations in outer scopes, and vice versa. In a given 387 // function declaration, all parameters subsequent to a 388 // parameter with a default argument shall have default 389 // arguments supplied in this or previous declarations. A 390 // default argument shall not be redefined by a later 391 // declaration (not even to the same value). 392 // 393 // C++ [dcl.fct.default]p6: 394 // Except for member functions of class templates, the default arguments 395 // in a member function definition that appears outside of the class 396 // definition are added to the set of default arguments provided by the 397 // member function declaration in the class definition. 398 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 399 ParmVarDecl *OldParam = Old->getParamDecl(p); 400 ParmVarDecl *NewParam = New->getParamDecl(p); 401 402 bool OldParamHasDfl = OldParam->hasDefaultArg(); 403 bool NewParamHasDfl = NewParam->hasDefaultArg(); 404 405 NamedDecl *ND = Old; 406 if (S && !isDeclInScope(ND, New->getDeclContext(), S)) 407 // Ignore default parameters of old decl if they are not in 408 // the same scope. 409 OldParamHasDfl = false; 410 411 if (OldParamHasDfl && NewParamHasDfl) { 412 413 unsigned DiagDefaultParamID = 414 diag::err_param_default_argument_redefinition; 415 416 // MSVC accepts that default parameters be redefined for member functions 417 // of template class. The new default parameter's value is ignored. 418 Invalid = true; 419 if (getLangOpts().MicrosoftExt) { 420 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 421 if (MD && MD->getParent()->getDescribedClassTemplate()) { 422 // Merge the old default argument into the new parameter. 423 NewParam->setHasInheritedDefaultArg(); 424 if (OldParam->hasUninstantiatedDefaultArg()) 425 NewParam->setUninstantiatedDefaultArg( 426 OldParam->getUninstantiatedDefaultArg()); 427 else 428 NewParam->setDefaultArg(OldParam->getInit()); 429 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 430 Invalid = false; 431 } 432 } 433 434 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 435 // hint here. Alternatively, we could walk the type-source information 436 // for NewParam to find the last source location in the type... but it 437 // isn't worth the effort right now. This is the kind of test case that 438 // is hard to get right: 439 // int f(int); 440 // void g(int (*fp)(int) = f); 441 // void g(int (*fp)(int) = &f); 442 Diag(NewParam->getLocation(), DiagDefaultParamID) 443 << NewParam->getDefaultArgRange(); 444 445 // Look for the function declaration where the default argument was 446 // actually written, which may be a declaration prior to Old. 447 for (FunctionDecl *Older = Old->getPreviousDecl(); 448 Older; Older = Older->getPreviousDecl()) { 449 if (!Older->getParamDecl(p)->hasDefaultArg()) 450 break; 451 452 OldParam = Older->getParamDecl(p); 453 } 454 455 Diag(OldParam->getLocation(), diag::note_previous_definition) 456 << OldParam->getDefaultArgRange(); 457 } else if (OldParamHasDfl) { 458 // Merge the old default argument into the new parameter. 459 // It's important to use getInit() here; getDefaultArg() 460 // strips off any top-level ExprWithCleanups. 461 NewParam->setHasInheritedDefaultArg(); 462 if (OldParam->hasUninstantiatedDefaultArg()) 463 NewParam->setUninstantiatedDefaultArg( 464 OldParam->getUninstantiatedDefaultArg()); 465 else 466 NewParam->setDefaultArg(OldParam->getInit()); 467 } else if (NewParamHasDfl) { 468 if (New->getDescribedFunctionTemplate()) { 469 // Paragraph 4, quoted above, only applies to non-template functions. 470 Diag(NewParam->getLocation(), 471 diag::err_param_default_argument_template_redecl) 472 << NewParam->getDefaultArgRange(); 473 Diag(Old->getLocation(), diag::note_template_prev_declaration) 474 << false; 475 } else if (New->getTemplateSpecializationKind() 476 != TSK_ImplicitInstantiation && 477 New->getTemplateSpecializationKind() != TSK_Undeclared) { 478 // C++ [temp.expr.spec]p21: 479 // Default function arguments shall not be specified in a declaration 480 // or a definition for one of the following explicit specializations: 481 // - the explicit specialization of a function template; 482 // - the explicit specialization of a member function template; 483 // - the explicit specialization of a member function of a class 484 // template where the class template specialization to which the 485 // member function specialization belongs is implicitly 486 // instantiated. 487 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 488 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 489 << New->getDeclName() 490 << NewParam->getDefaultArgRange(); 491 } else if (New->getDeclContext()->isDependentContext()) { 492 // C++ [dcl.fct.default]p6 (DR217): 493 // Default arguments for a member function of a class template shall 494 // be specified on the initial declaration of the member function 495 // within the class template. 496 // 497 // Reading the tea leaves a bit in DR217 and its reference to DR205 498 // leads me to the conclusion that one cannot add default function 499 // arguments for an out-of-line definition of a member function of a 500 // dependent type. 501 int WhichKind = 2; 502 if (CXXRecordDecl *Record 503 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 504 if (Record->getDescribedClassTemplate()) 505 WhichKind = 0; 506 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 507 WhichKind = 1; 508 else 509 WhichKind = 2; 510 } 511 512 Diag(NewParam->getLocation(), 513 diag::err_param_default_argument_member_template_redecl) 514 << WhichKind 515 << NewParam->getDefaultArgRange(); 516 } else if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(New)) { 517 CXXSpecialMember NewSM = getSpecialMember(Ctor), 518 OldSM = getSpecialMember(cast<CXXConstructorDecl>(Old)); 519 if (NewSM != OldSM) { 520 Diag(NewParam->getLocation(),diag::warn_default_arg_makes_ctor_special) 521 << NewParam->getDefaultArgRange() << NewSM; 522 Diag(Old->getLocation(), diag::note_previous_declaration_special) 523 << OldSM; 524 } 525 } 526 } 527 } 528 529 // C++11 [dcl.constexpr]p1: If any declaration of a function or function 530 // template has a constexpr specifier then all its declarations shall 531 // contain the constexpr specifier. 532 if (New->isConstexpr() != Old->isConstexpr()) { 533 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 534 << New << New->isConstexpr(); 535 Diag(Old->getLocation(), diag::note_previous_declaration); 536 Invalid = true; 537 } 538 539 if (CheckEquivalentExceptionSpec(Old, New)) 540 Invalid = true; 541 542 return Invalid; 543} 544 545/// \brief Merge the exception specifications of two variable declarations. 546/// 547/// This is called when there's a redeclaration of a VarDecl. The function 548/// checks if the redeclaration might have an exception specification and 549/// validates compatibility and merges the specs if necessary. 550void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 551 // Shortcut if exceptions are disabled. 552 if (!getLangOpts().CXXExceptions) 553 return; 554 555 assert(Context.hasSameType(New->getType(), Old->getType()) && 556 "Should only be called if types are otherwise the same."); 557 558 QualType NewType = New->getType(); 559 QualType OldType = Old->getType(); 560 561 // We're only interested in pointers and references to functions, as well 562 // as pointers to member functions. 563 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 564 NewType = R->getPointeeType(); 565 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 566 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 567 NewType = P->getPointeeType(); 568 OldType = OldType->getAs<PointerType>()->getPointeeType(); 569 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 570 NewType = M->getPointeeType(); 571 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 572 } 573 574 if (!NewType->isFunctionProtoType()) 575 return; 576 577 // There's lots of special cases for functions. For function pointers, system 578 // libraries are hopefully not as broken so that we don't need these 579 // workarounds. 580 if (CheckEquivalentExceptionSpec( 581 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 582 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 583 New->setInvalidDecl(); 584 } 585} 586 587/// CheckCXXDefaultArguments - Verify that the default arguments for a 588/// function declaration are well-formed according to C++ 589/// [dcl.fct.default]. 590void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 591 unsigned NumParams = FD->getNumParams(); 592 unsigned p; 593 594 bool IsLambda = FD->getOverloadedOperator() == OO_Call && 595 isa<CXXMethodDecl>(FD) && 596 cast<CXXMethodDecl>(FD)->getParent()->isLambda(); 597 598 // Find first parameter with a default argument 599 for (p = 0; p < NumParams; ++p) { 600 ParmVarDecl *Param = FD->getParamDecl(p); 601 if (Param->hasDefaultArg()) { 602 // C++11 [expr.prim.lambda]p5: 603 // [...] Default arguments (8.3.6) shall not be specified in the 604 // parameter-declaration-clause of a lambda-declarator. 605 // 606 // FIXME: Core issue 974 strikes this sentence, we only provide an 607 // extension warning. 608 if (IsLambda) 609 Diag(Param->getLocation(), diag::ext_lambda_default_arguments) 610 << Param->getDefaultArgRange(); 611 break; 612 } 613 } 614 615 // C++ [dcl.fct.default]p4: 616 // In a given function declaration, all parameters 617 // subsequent to a parameter with a default argument shall 618 // have default arguments supplied in this or previous 619 // declarations. A default argument shall not be redefined 620 // by a later declaration (not even to the same value). 621 unsigned LastMissingDefaultArg = 0; 622 for (; p < NumParams; ++p) { 623 ParmVarDecl *Param = FD->getParamDecl(p); 624 if (!Param->hasDefaultArg()) { 625 if (Param->isInvalidDecl()) 626 /* We already complained about this parameter. */; 627 else if (Param->getIdentifier()) 628 Diag(Param->getLocation(), 629 diag::err_param_default_argument_missing_name) 630 << Param->getIdentifier(); 631 else 632 Diag(Param->getLocation(), 633 diag::err_param_default_argument_missing); 634 635 LastMissingDefaultArg = p; 636 } 637 } 638 639 if (LastMissingDefaultArg > 0) { 640 // Some default arguments were missing. Clear out all of the 641 // default arguments up to (and including) the last missing 642 // default argument, so that we leave the function parameters 643 // in a semantically valid state. 644 for (p = 0; p <= LastMissingDefaultArg; ++p) { 645 ParmVarDecl *Param = FD->getParamDecl(p); 646 if (Param->hasDefaultArg()) { 647 Param->setDefaultArg(0); 648 } 649 } 650 } 651} 652 653// CheckConstexprParameterTypes - Check whether a function's parameter types 654// are all literal types. If so, return true. If not, produce a suitable 655// diagnostic and return false. 656static bool CheckConstexprParameterTypes(Sema &SemaRef, 657 const FunctionDecl *FD) { 658 unsigned ArgIndex = 0; 659 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 660 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 661 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 662 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 663 SourceLocation ParamLoc = PD->getLocation(); 664 if (!(*i)->isDependentType() && 665 SemaRef.RequireLiteralType(ParamLoc, *i, 666 SemaRef.PDiag(diag::err_constexpr_non_literal_param) 667 << ArgIndex+1 << PD->getSourceRange() 668 << isa<CXXConstructorDecl>(FD))) 669 return false; 670 } 671 return true; 672} 673 674// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 675// the requirements of a constexpr function definition or a constexpr 676// constructor definition. If so, return true. If not, produce appropriate 677// diagnostics and return false. 678// 679// This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. 680bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) { 681 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 682 if (MD && MD->isInstance()) { 683 // C++11 [dcl.constexpr]p4: 684 // The definition of a constexpr constructor shall satisfy the following 685 // constraints: 686 // - the class shall not have any virtual base classes; 687 const CXXRecordDecl *RD = MD->getParent(); 688 if (RD->getNumVBases()) { 689 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) 690 << isa<CXXConstructorDecl>(NewFD) << RD->isStruct() 691 << RD->getNumVBases(); 692 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 693 E = RD->vbases_end(); I != E; ++I) 694 Diag(I->getLocStart(), 695 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 696 return false; 697 } 698 } 699 700 if (!isa<CXXConstructorDecl>(NewFD)) { 701 // C++11 [dcl.constexpr]p3: 702 // The definition of a constexpr function shall satisfy the following 703 // constraints: 704 // - it shall not be virtual; 705 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 706 if (Method && Method->isVirtual()) { 707 Diag(NewFD->getLocation(), diag::err_constexpr_virtual); 708 709 // If it's not obvious why this function is virtual, find an overridden 710 // function which uses the 'virtual' keyword. 711 const CXXMethodDecl *WrittenVirtual = Method; 712 while (!WrittenVirtual->isVirtualAsWritten()) 713 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 714 if (WrittenVirtual != Method) 715 Diag(WrittenVirtual->getLocation(), 716 diag::note_overridden_virtual_function); 717 return false; 718 } 719 720 // - its return type shall be a literal type; 721 QualType RT = NewFD->getResultType(); 722 if (!RT->isDependentType() && 723 RequireLiteralType(NewFD->getLocation(), RT, 724 PDiag(diag::err_constexpr_non_literal_return))) 725 return false; 726 } 727 728 // - each of its parameter types shall be a literal type; 729 if (!CheckConstexprParameterTypes(*this, NewFD)) 730 return false; 731 732 return true; 733} 734 735/// Check the given declaration statement is legal within a constexpr function 736/// body. C++0x [dcl.constexpr]p3,p4. 737/// 738/// \return true if the body is OK, false if we have diagnosed a problem. 739static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 740 DeclStmt *DS) { 741 // C++0x [dcl.constexpr]p3 and p4: 742 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 743 // contain only 744 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 745 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 746 switch ((*DclIt)->getKind()) { 747 case Decl::StaticAssert: 748 case Decl::Using: 749 case Decl::UsingShadow: 750 case Decl::UsingDirective: 751 case Decl::UnresolvedUsingTypename: 752 // - static_assert-declarations 753 // - using-declarations, 754 // - using-directives, 755 continue; 756 757 case Decl::Typedef: 758 case Decl::TypeAlias: { 759 // - typedef declarations and alias-declarations that do not define 760 // classes or enumerations, 761 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 762 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 763 // Don't allow variably-modified types in constexpr functions. 764 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 765 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 766 << TL.getSourceRange() << TL.getType() 767 << isa<CXXConstructorDecl>(Dcl); 768 return false; 769 } 770 continue; 771 } 772 773 case Decl::Enum: 774 case Decl::CXXRecord: 775 // As an extension, we allow the declaration (but not the definition) of 776 // classes and enumerations in all declarations, not just in typedef and 777 // alias declarations. 778 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 779 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 780 << isa<CXXConstructorDecl>(Dcl); 781 return false; 782 } 783 continue; 784 785 case Decl::Var: 786 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 787 << isa<CXXConstructorDecl>(Dcl); 788 return false; 789 790 default: 791 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 792 << isa<CXXConstructorDecl>(Dcl); 793 return false; 794 } 795 } 796 797 return true; 798} 799 800/// Check that the given field is initialized within a constexpr constructor. 801/// 802/// \param Dcl The constexpr constructor being checked. 803/// \param Field The field being checked. This may be a member of an anonymous 804/// struct or union nested within the class being checked. 805/// \param Inits All declarations, including anonymous struct/union members and 806/// indirect members, for which any initialization was provided. 807/// \param Diagnosed Set to true if an error is produced. 808static void CheckConstexprCtorInitializer(Sema &SemaRef, 809 const FunctionDecl *Dcl, 810 FieldDecl *Field, 811 llvm::SmallSet<Decl*, 16> &Inits, 812 bool &Diagnosed) { 813 if (Field->isUnnamedBitfield()) 814 return; 815 816 if (Field->isAnonymousStructOrUnion() && 817 Field->getType()->getAsCXXRecordDecl()->isEmpty()) 818 return; 819 820 if (!Inits.count(Field)) { 821 if (!Diagnosed) { 822 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 823 Diagnosed = true; 824 } 825 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 826 } else if (Field->isAnonymousStructOrUnion()) { 827 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 828 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 829 I != E; ++I) 830 // If an anonymous union contains an anonymous struct of which any member 831 // is initialized, all members must be initialized. 832 if (!RD->isUnion() || Inits.count(*I)) 833 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 834 } 835} 836 837/// Check the body for the given constexpr function declaration only contains 838/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 839/// 840/// \return true if the body is OK, false if we have diagnosed a problem. 841bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 842 if (isa<CXXTryStmt>(Body)) { 843 // C++11 [dcl.constexpr]p3: 844 // The definition of a constexpr function shall satisfy the following 845 // constraints: [...] 846 // - its function-body shall be = delete, = default, or a 847 // compound-statement 848 // 849 // C++11 [dcl.constexpr]p4: 850 // In the definition of a constexpr constructor, [...] 851 // - its function-body shall not be a function-try-block; 852 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 853 << isa<CXXConstructorDecl>(Dcl); 854 return false; 855 } 856 857 // - its function-body shall be [...] a compound-statement that contains only 858 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 859 860 llvm::SmallVector<SourceLocation, 4> ReturnStmts; 861 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 862 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 863 switch ((*BodyIt)->getStmtClass()) { 864 case Stmt::NullStmtClass: 865 // - null statements, 866 continue; 867 868 case Stmt::DeclStmtClass: 869 // - static_assert-declarations 870 // - using-declarations, 871 // - using-directives, 872 // - typedef declarations and alias-declarations that do not define 873 // classes or enumerations, 874 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 875 return false; 876 continue; 877 878 case Stmt::ReturnStmtClass: 879 // - and exactly one return statement; 880 if (isa<CXXConstructorDecl>(Dcl)) 881 break; 882 883 ReturnStmts.push_back((*BodyIt)->getLocStart()); 884 continue; 885 886 default: 887 break; 888 } 889 890 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 891 << isa<CXXConstructorDecl>(Dcl); 892 return false; 893 } 894 895 if (const CXXConstructorDecl *Constructor 896 = dyn_cast<CXXConstructorDecl>(Dcl)) { 897 const CXXRecordDecl *RD = Constructor->getParent(); 898 // DR1359: 899 // - every non-variant non-static data member and base class sub-object 900 // shall be initialized; 901 // - if the class is a non-empty union, or for each non-empty anonymous 902 // union member of a non-union class, exactly one non-static data member 903 // shall be initialized; 904 if (RD->isUnion()) { 905 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) { 906 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 907 return false; 908 } 909 } else if (!Constructor->isDependentContext() && 910 !Constructor->isDelegatingConstructor()) { 911 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 912 913 // Skip detailed checking if we have enough initializers, and we would 914 // allow at most one initializer per member. 915 bool AnyAnonStructUnionMembers = false; 916 unsigned Fields = 0; 917 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 918 E = RD->field_end(); I != E; ++I, ++Fields) { 919 if ((*I)->isAnonymousStructOrUnion()) { 920 AnyAnonStructUnionMembers = true; 921 break; 922 } 923 } 924 if (AnyAnonStructUnionMembers || 925 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 926 // Check initialization of non-static data members. Base classes are 927 // always initialized so do not need to be checked. Dependent bases 928 // might not have initializers in the member initializer list. 929 llvm::SmallSet<Decl*, 16> Inits; 930 for (CXXConstructorDecl::init_const_iterator 931 I = Constructor->init_begin(), E = Constructor->init_end(); 932 I != E; ++I) { 933 if (FieldDecl *FD = (*I)->getMember()) 934 Inits.insert(FD); 935 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 936 Inits.insert(ID->chain_begin(), ID->chain_end()); 937 } 938 939 bool Diagnosed = false; 940 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 941 E = RD->field_end(); I != E; ++I) 942 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 943 if (Diagnosed) 944 return false; 945 } 946 } 947 } else { 948 if (ReturnStmts.empty()) { 949 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 950 return false; 951 } 952 if (ReturnStmts.size() > 1) { 953 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 954 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 955 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 956 return false; 957 } 958 } 959 960 // C++11 [dcl.constexpr]p5: 961 // if no function argument values exist such that the function invocation 962 // substitution would produce a constant expression, the program is 963 // ill-formed; no diagnostic required. 964 // C++11 [dcl.constexpr]p3: 965 // - every constructor call and implicit conversion used in initializing the 966 // return value shall be one of those allowed in a constant expression. 967 // C++11 [dcl.constexpr]p4: 968 // - every constructor involved in initializing non-static data members and 969 // base class sub-objects shall be a constexpr constructor. 970 llvm::SmallVector<PartialDiagnosticAt, 8> Diags; 971 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) { 972 Diag(Dcl->getLocation(), diag::err_constexpr_function_never_constant_expr) 973 << isa<CXXConstructorDecl>(Dcl); 974 for (size_t I = 0, N = Diags.size(); I != N; ++I) 975 Diag(Diags[I].first, Diags[I].second); 976 return false; 977 } 978 979 return true; 980} 981 982/// isCurrentClassName - Determine whether the identifier II is the 983/// name of the class type currently being defined. In the case of 984/// nested classes, this will only return true if II is the name of 985/// the innermost class. 986bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 987 const CXXScopeSpec *SS) { 988 assert(getLangOpts().CPlusPlus && "No class names in C!"); 989 990 CXXRecordDecl *CurDecl; 991 if (SS && SS->isSet() && !SS->isInvalid()) { 992 DeclContext *DC = computeDeclContext(*SS, true); 993 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 994 } else 995 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 996 997 if (CurDecl && CurDecl->getIdentifier()) 998 return &II == CurDecl->getIdentifier(); 999 else 1000 return false; 1001} 1002 1003/// \brief Check the validity of a C++ base class specifier. 1004/// 1005/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1006/// and returns NULL otherwise. 1007CXXBaseSpecifier * 1008Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1009 SourceRange SpecifierRange, 1010 bool Virtual, AccessSpecifier Access, 1011 TypeSourceInfo *TInfo, 1012 SourceLocation EllipsisLoc) { 1013 QualType BaseType = TInfo->getType(); 1014 1015 // C++ [class.union]p1: 1016 // A union shall not have base classes. 1017 if (Class->isUnion()) { 1018 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1019 << SpecifierRange; 1020 return 0; 1021 } 1022 1023 if (EllipsisLoc.isValid() && 1024 !TInfo->getType()->containsUnexpandedParameterPack()) { 1025 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1026 << TInfo->getTypeLoc().getSourceRange(); 1027 EllipsisLoc = SourceLocation(); 1028 } 1029 1030 if (BaseType->isDependentType()) 1031 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1032 Class->getTagKind() == TTK_Class, 1033 Access, TInfo, EllipsisLoc); 1034 1035 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1036 1037 // Base specifiers must be record types. 1038 if (!BaseType->isRecordType()) { 1039 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1040 return 0; 1041 } 1042 1043 // C++ [class.union]p1: 1044 // A union shall not be used as a base class. 1045 if (BaseType->isUnionType()) { 1046 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1047 return 0; 1048 } 1049 1050 // C++ [class.derived]p2: 1051 // The class-name in a base-specifier shall not be an incompletely 1052 // defined class. 1053 if (RequireCompleteType(BaseLoc, BaseType, 1054 PDiag(diag::err_incomplete_base_class) 1055 << SpecifierRange)) { 1056 Class->setInvalidDecl(); 1057 return 0; 1058 } 1059 1060 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1061 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1062 assert(BaseDecl && "Record type has no declaration"); 1063 BaseDecl = BaseDecl->getDefinition(); 1064 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1065 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1066 assert(CXXBaseDecl && "Base type is not a C++ type"); 1067 1068 // C++ [class]p3: 1069 // If a class is marked final and it appears as a base-type-specifier in 1070 // base-clause, the program is ill-formed. 1071 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1072 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1073 << CXXBaseDecl->getDeclName(); 1074 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1075 << CXXBaseDecl->getDeclName(); 1076 return 0; 1077 } 1078 1079 if (BaseDecl->isInvalidDecl()) 1080 Class->setInvalidDecl(); 1081 1082 // Create the base specifier. 1083 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1084 Class->getTagKind() == TTK_Class, 1085 Access, TInfo, EllipsisLoc); 1086} 1087 1088/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1089/// one entry in the base class list of a class specifier, for 1090/// example: 1091/// class foo : public bar, virtual private baz { 1092/// 'public bar' and 'virtual private baz' are each base-specifiers. 1093BaseResult 1094Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1095 bool Virtual, AccessSpecifier Access, 1096 ParsedType basetype, SourceLocation BaseLoc, 1097 SourceLocation EllipsisLoc) { 1098 if (!classdecl) 1099 return true; 1100 1101 AdjustDeclIfTemplate(classdecl); 1102 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1103 if (!Class) 1104 return true; 1105 1106 TypeSourceInfo *TInfo = 0; 1107 GetTypeFromParser(basetype, &TInfo); 1108 1109 if (EllipsisLoc.isInvalid() && 1110 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1111 UPPC_BaseType)) 1112 return true; 1113 1114 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1115 Virtual, Access, TInfo, 1116 EllipsisLoc)) 1117 return BaseSpec; 1118 1119 return true; 1120} 1121 1122/// \brief Performs the actual work of attaching the given base class 1123/// specifiers to a C++ class. 1124bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1125 unsigned NumBases) { 1126 if (NumBases == 0) 1127 return false; 1128 1129 // Used to keep track of which base types we have already seen, so 1130 // that we can properly diagnose redundant direct base types. Note 1131 // that the key is always the unqualified canonical type of the base 1132 // class. 1133 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1134 1135 // Copy non-redundant base specifiers into permanent storage. 1136 unsigned NumGoodBases = 0; 1137 bool Invalid = false; 1138 for (unsigned idx = 0; idx < NumBases; ++idx) { 1139 QualType NewBaseType 1140 = Context.getCanonicalType(Bases[idx]->getType()); 1141 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1142 1143 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; 1144 if (KnownBase) { 1145 // C++ [class.mi]p3: 1146 // A class shall not be specified as a direct base class of a 1147 // derived class more than once. 1148 Diag(Bases[idx]->getLocStart(), 1149 diag::err_duplicate_base_class) 1150 << KnownBase->getType() 1151 << Bases[idx]->getSourceRange(); 1152 1153 // Delete the duplicate base class specifier; we're going to 1154 // overwrite its pointer later. 1155 Context.Deallocate(Bases[idx]); 1156 1157 Invalid = true; 1158 } else { 1159 // Okay, add this new base class. 1160 KnownBase = Bases[idx]; 1161 Bases[NumGoodBases++] = Bases[idx]; 1162 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) 1163 if (const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl())) 1164 if (RD->hasAttr<WeakAttr>()) 1165 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1166 } 1167 } 1168 1169 // Attach the remaining base class specifiers to the derived class. 1170 Class->setBases(Bases, NumGoodBases); 1171 1172 // Delete the remaining (good) base class specifiers, since their 1173 // data has been copied into the CXXRecordDecl. 1174 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1175 Context.Deallocate(Bases[idx]); 1176 1177 return Invalid; 1178} 1179 1180/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1181/// class, after checking whether there are any duplicate base 1182/// classes. 1183void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1184 unsigned NumBases) { 1185 if (!ClassDecl || !Bases || !NumBases) 1186 return; 1187 1188 AdjustDeclIfTemplate(ClassDecl); 1189 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1190 (CXXBaseSpecifier**)(Bases), NumBases); 1191} 1192 1193static CXXRecordDecl *GetClassForType(QualType T) { 1194 if (const RecordType *RT = T->getAs<RecordType>()) 1195 return cast<CXXRecordDecl>(RT->getDecl()); 1196 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1197 return ICT->getDecl(); 1198 else 1199 return 0; 1200} 1201 1202/// \brief Determine whether the type \p Derived is a C++ class that is 1203/// derived from the type \p Base. 1204bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1205 if (!getLangOpts().CPlusPlus) 1206 return false; 1207 1208 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1209 if (!DerivedRD) 1210 return false; 1211 1212 CXXRecordDecl *BaseRD = GetClassForType(Base); 1213 if (!BaseRD) 1214 return false; 1215 1216 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1217 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1218} 1219 1220/// \brief Determine whether the type \p Derived is a C++ class that is 1221/// derived from the type \p Base. 1222bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1223 if (!getLangOpts().CPlusPlus) 1224 return false; 1225 1226 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1227 if (!DerivedRD) 1228 return false; 1229 1230 CXXRecordDecl *BaseRD = GetClassForType(Base); 1231 if (!BaseRD) 1232 return false; 1233 1234 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1235} 1236 1237void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1238 CXXCastPath &BasePathArray) { 1239 assert(BasePathArray.empty() && "Base path array must be empty!"); 1240 assert(Paths.isRecordingPaths() && "Must record paths!"); 1241 1242 const CXXBasePath &Path = Paths.front(); 1243 1244 // We first go backward and check if we have a virtual base. 1245 // FIXME: It would be better if CXXBasePath had the base specifier for 1246 // the nearest virtual base. 1247 unsigned Start = 0; 1248 for (unsigned I = Path.size(); I != 0; --I) { 1249 if (Path[I - 1].Base->isVirtual()) { 1250 Start = I - 1; 1251 break; 1252 } 1253 } 1254 1255 // Now add all bases. 1256 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1257 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1258} 1259 1260/// \brief Determine whether the given base path includes a virtual 1261/// base class. 1262bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1263 for (CXXCastPath::const_iterator B = BasePath.begin(), 1264 BEnd = BasePath.end(); 1265 B != BEnd; ++B) 1266 if ((*B)->isVirtual()) 1267 return true; 1268 1269 return false; 1270} 1271 1272/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1273/// conversion (where Derived and Base are class types) is 1274/// well-formed, meaning that the conversion is unambiguous (and 1275/// that all of the base classes are accessible). Returns true 1276/// and emits a diagnostic if the code is ill-formed, returns false 1277/// otherwise. Loc is the location where this routine should point to 1278/// if there is an error, and Range is the source range to highlight 1279/// if there is an error. 1280bool 1281Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1282 unsigned InaccessibleBaseID, 1283 unsigned AmbigiousBaseConvID, 1284 SourceLocation Loc, SourceRange Range, 1285 DeclarationName Name, 1286 CXXCastPath *BasePath) { 1287 // First, determine whether the path from Derived to Base is 1288 // ambiguous. This is slightly more expensive than checking whether 1289 // the Derived to Base conversion exists, because here we need to 1290 // explore multiple paths to determine if there is an ambiguity. 1291 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1292 /*DetectVirtual=*/false); 1293 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1294 assert(DerivationOkay && 1295 "Can only be used with a derived-to-base conversion"); 1296 (void)DerivationOkay; 1297 1298 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1299 if (InaccessibleBaseID) { 1300 // Check that the base class can be accessed. 1301 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1302 InaccessibleBaseID)) { 1303 case AR_inaccessible: 1304 return true; 1305 case AR_accessible: 1306 case AR_dependent: 1307 case AR_delayed: 1308 break; 1309 } 1310 } 1311 1312 // Build a base path if necessary. 1313 if (BasePath) 1314 BuildBasePathArray(Paths, *BasePath); 1315 return false; 1316 } 1317 1318 // We know that the derived-to-base conversion is ambiguous, and 1319 // we're going to produce a diagnostic. Perform the derived-to-base 1320 // search just one more time to compute all of the possible paths so 1321 // that we can print them out. This is more expensive than any of 1322 // the previous derived-to-base checks we've done, but at this point 1323 // performance isn't as much of an issue. 1324 Paths.clear(); 1325 Paths.setRecordingPaths(true); 1326 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1327 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1328 (void)StillOkay; 1329 1330 // Build up a textual representation of the ambiguous paths, e.g., 1331 // D -> B -> A, that will be used to illustrate the ambiguous 1332 // conversions in the diagnostic. We only print one of the paths 1333 // to each base class subobject. 1334 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1335 1336 Diag(Loc, AmbigiousBaseConvID) 1337 << Derived << Base << PathDisplayStr << Range << Name; 1338 return true; 1339} 1340 1341bool 1342Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1343 SourceLocation Loc, SourceRange Range, 1344 CXXCastPath *BasePath, 1345 bool IgnoreAccess) { 1346 return CheckDerivedToBaseConversion(Derived, Base, 1347 IgnoreAccess ? 0 1348 : diag::err_upcast_to_inaccessible_base, 1349 diag::err_ambiguous_derived_to_base_conv, 1350 Loc, Range, DeclarationName(), 1351 BasePath); 1352} 1353 1354 1355/// @brief Builds a string representing ambiguous paths from a 1356/// specific derived class to different subobjects of the same base 1357/// class. 1358/// 1359/// This function builds a string that can be used in error messages 1360/// to show the different paths that one can take through the 1361/// inheritance hierarchy to go from the derived class to different 1362/// subobjects of a base class. The result looks something like this: 1363/// @code 1364/// struct D -> struct B -> struct A 1365/// struct D -> struct C -> struct A 1366/// @endcode 1367std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1368 std::string PathDisplayStr; 1369 std::set<unsigned> DisplayedPaths; 1370 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1371 Path != Paths.end(); ++Path) { 1372 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1373 // We haven't displayed a path to this particular base 1374 // class subobject yet. 1375 PathDisplayStr += "\n "; 1376 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1377 for (CXXBasePath::const_iterator Element = Path->begin(); 1378 Element != Path->end(); ++Element) 1379 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1380 } 1381 } 1382 1383 return PathDisplayStr; 1384} 1385 1386//===----------------------------------------------------------------------===// 1387// C++ class member Handling 1388//===----------------------------------------------------------------------===// 1389 1390/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1391bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1392 SourceLocation ASLoc, 1393 SourceLocation ColonLoc, 1394 AttributeList *Attrs) { 1395 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1396 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1397 ASLoc, ColonLoc); 1398 CurContext->addHiddenDecl(ASDecl); 1399 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1400} 1401 1402/// CheckOverrideControl - Check C++0x override control semantics. 1403void Sema::CheckOverrideControl(const Decl *D) { 1404 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1405 if (!MD || !MD->isVirtual()) 1406 return; 1407 1408 if (MD->isDependentContext()) 1409 return; 1410 1411 // C++0x [class.virtual]p3: 1412 // If a virtual function is marked with the virt-specifier override and does 1413 // not override a member function of a base class, 1414 // the program is ill-formed. 1415 bool HasOverriddenMethods = 1416 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1417 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1418 Diag(MD->getLocation(), 1419 diag::err_function_marked_override_not_overriding) 1420 << MD->getDeclName(); 1421 return; 1422 } 1423} 1424 1425/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1426/// function overrides a virtual member function marked 'final', according to 1427/// C++0x [class.virtual]p3. 1428bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1429 const CXXMethodDecl *Old) { 1430 if (!Old->hasAttr<FinalAttr>()) 1431 return false; 1432 1433 Diag(New->getLocation(), diag::err_final_function_overridden) 1434 << New->getDeclName(); 1435 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1436 return true; 1437} 1438 1439/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1440/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1441/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1442/// one has been parsed, and 'HasDeferredInit' is true if an initializer is 1443/// present but parsing it has been deferred. 1444Decl * 1445Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1446 MultiTemplateParamsArg TemplateParameterLists, 1447 Expr *BW, const VirtSpecifiers &VS, 1448 bool HasDeferredInit) { 1449 const DeclSpec &DS = D.getDeclSpec(); 1450 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1451 DeclarationName Name = NameInfo.getName(); 1452 SourceLocation Loc = NameInfo.getLoc(); 1453 1454 // For anonymous bitfields, the location should point to the type. 1455 if (Loc.isInvalid()) 1456 Loc = D.getLocStart(); 1457 1458 Expr *BitWidth = static_cast<Expr*>(BW); 1459 1460 assert(isa<CXXRecordDecl>(CurContext)); 1461 assert(!DS.isFriendSpecified()); 1462 1463 bool isFunc = D.isDeclarationOfFunction(); 1464 1465 // C++ 9.2p6: A member shall not be declared to have automatic storage 1466 // duration (auto, register) or with the extern storage-class-specifier. 1467 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1468 // data members and cannot be applied to names declared const or static, 1469 // and cannot be applied to reference members. 1470 switch (DS.getStorageClassSpec()) { 1471 case DeclSpec::SCS_unspecified: 1472 case DeclSpec::SCS_typedef: 1473 case DeclSpec::SCS_static: 1474 // FALL THROUGH. 1475 break; 1476 case DeclSpec::SCS_mutable: 1477 if (isFunc) { 1478 if (DS.getStorageClassSpecLoc().isValid()) 1479 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1480 else 1481 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1482 1483 // FIXME: It would be nicer if the keyword was ignored only for this 1484 // declarator. Otherwise we could get follow-up errors. 1485 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1486 } 1487 break; 1488 default: 1489 if (DS.getStorageClassSpecLoc().isValid()) 1490 Diag(DS.getStorageClassSpecLoc(), 1491 diag::err_storageclass_invalid_for_member); 1492 else 1493 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1494 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1495 } 1496 1497 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1498 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1499 !isFunc); 1500 1501 Decl *Member; 1502 if (isInstField) { 1503 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1504 1505 // Data members must have identifiers for names. 1506 if (Name.getNameKind() != DeclarationName::Identifier) { 1507 Diag(Loc, diag::err_bad_variable_name) 1508 << Name; 1509 return 0; 1510 } 1511 1512 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1513 1514 // Member field could not be with "template" keyword. 1515 // So TemplateParameterLists should be empty in this case. 1516 if (TemplateParameterLists.size()) { 1517 TemplateParameterList* TemplateParams = TemplateParameterLists.get()[0]; 1518 if (TemplateParams->size()) { 1519 // There is no such thing as a member field template. 1520 Diag(D.getIdentifierLoc(), diag::err_template_member) 1521 << II 1522 << SourceRange(TemplateParams->getTemplateLoc(), 1523 TemplateParams->getRAngleLoc()); 1524 } else { 1525 // There is an extraneous 'template<>' for this member. 1526 Diag(TemplateParams->getTemplateLoc(), 1527 diag::err_template_member_noparams) 1528 << II 1529 << SourceRange(TemplateParams->getTemplateLoc(), 1530 TemplateParams->getRAngleLoc()); 1531 } 1532 return 0; 1533 } 1534 1535 if (SS.isSet() && !SS.isInvalid()) { 1536 // The user provided a superfluous scope specifier inside a class 1537 // definition: 1538 // 1539 // class X { 1540 // int X::member; 1541 // }; 1542 if (DeclContext *DC = computeDeclContext(SS, false)) 1543 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc()); 1544 else 1545 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1546 << Name << SS.getRange(); 1547 1548 SS.clear(); 1549 } 1550 1551 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1552 HasDeferredInit, AS); 1553 assert(Member && "HandleField never returns null"); 1554 } else { 1555 assert(!HasDeferredInit); 1556 1557 Member = HandleDeclarator(S, D, move(TemplateParameterLists)); 1558 if (!Member) { 1559 return 0; 1560 } 1561 1562 // Non-instance-fields can't have a bitfield. 1563 if (BitWidth) { 1564 if (Member->isInvalidDecl()) { 1565 // don't emit another diagnostic. 1566 } else if (isa<VarDecl>(Member)) { 1567 // C++ 9.6p3: A bit-field shall not be a static member. 1568 // "static member 'A' cannot be a bit-field" 1569 Diag(Loc, diag::err_static_not_bitfield) 1570 << Name << BitWidth->getSourceRange(); 1571 } else if (isa<TypedefDecl>(Member)) { 1572 // "typedef member 'x' cannot be a bit-field" 1573 Diag(Loc, diag::err_typedef_not_bitfield) 1574 << Name << BitWidth->getSourceRange(); 1575 } else { 1576 // A function typedef ("typedef int f(); f a;"). 1577 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1578 Diag(Loc, diag::err_not_integral_type_bitfield) 1579 << Name << cast<ValueDecl>(Member)->getType() 1580 << BitWidth->getSourceRange(); 1581 } 1582 1583 BitWidth = 0; 1584 Member->setInvalidDecl(); 1585 } 1586 1587 Member->setAccess(AS); 1588 1589 // If we have declared a member function template, set the access of the 1590 // templated declaration as well. 1591 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1592 FunTmpl->getTemplatedDecl()->setAccess(AS); 1593 } 1594 1595 if (VS.isOverrideSpecified()) { 1596 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1597 if (!MD || !MD->isVirtual()) { 1598 Diag(Member->getLocStart(), 1599 diag::override_keyword_only_allowed_on_virtual_member_functions) 1600 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1601 } else 1602 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1603 } 1604 if (VS.isFinalSpecified()) { 1605 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1606 if (!MD || !MD->isVirtual()) { 1607 Diag(Member->getLocStart(), 1608 diag::override_keyword_only_allowed_on_virtual_member_functions) 1609 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1610 } else 1611 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1612 } 1613 1614 if (VS.getLastLocation().isValid()) { 1615 // Update the end location of a method that has a virt-specifiers. 1616 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1617 MD->setRangeEnd(VS.getLastLocation()); 1618 } 1619 1620 CheckOverrideControl(Member); 1621 1622 assert((Name || isInstField) && "No identifier for non-field ?"); 1623 1624 if (isInstField) 1625 FieldCollector->Add(cast<FieldDecl>(Member)); 1626 return Member; 1627} 1628 1629/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1630/// in-class initializer for a non-static C++ class member, and after 1631/// instantiating an in-class initializer in a class template. Such actions 1632/// are deferred until the class is complete. 1633void 1634Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation EqualLoc, 1635 Expr *InitExpr) { 1636 FieldDecl *FD = cast<FieldDecl>(D); 1637 1638 if (!InitExpr) { 1639 FD->setInvalidDecl(); 1640 FD->removeInClassInitializer(); 1641 return; 1642 } 1643 1644 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1645 FD->setInvalidDecl(); 1646 FD->removeInClassInitializer(); 1647 return; 1648 } 1649 1650 ExprResult Init = InitExpr; 1651 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1652 if (isa<InitListExpr>(InitExpr) && isStdInitializerList(FD->getType(), 0)) { 1653 Diag(FD->getLocation(), diag::warn_dangling_std_initializer_list) 1654 << /*at end of ctor*/1 << InitExpr->getSourceRange(); 1655 } 1656 Expr **Inits = &InitExpr; 1657 unsigned NumInits = 1; 1658 InitializedEntity Entity = InitializedEntity::InitializeMember(FD); 1659 InitializationKind Kind = EqualLoc.isInvalid() 1660 ? InitializationKind::CreateDirectList(InitExpr->getLocStart()) 1661 : InitializationKind::CreateCopy(InitExpr->getLocStart(), EqualLoc); 1662 InitializationSequence Seq(*this, Entity, Kind, Inits, NumInits); 1663 Init = Seq.Perform(*this, Entity, Kind, MultiExprArg(Inits, NumInits)); 1664 if (Init.isInvalid()) { 1665 FD->setInvalidDecl(); 1666 return; 1667 } 1668 1669 CheckImplicitConversions(Init.get(), EqualLoc); 1670 } 1671 1672 // C++0x [class.base.init]p7: 1673 // The initialization of each base and member constitutes a 1674 // full-expression. 1675 Init = MaybeCreateExprWithCleanups(Init); 1676 if (Init.isInvalid()) { 1677 FD->setInvalidDecl(); 1678 return; 1679 } 1680 1681 InitExpr = Init.release(); 1682 1683 FD->setInClassInitializer(InitExpr); 1684} 1685 1686/// \brief Find the direct and/or virtual base specifiers that 1687/// correspond to the given base type, for use in base initialization 1688/// within a constructor. 1689static bool FindBaseInitializer(Sema &SemaRef, 1690 CXXRecordDecl *ClassDecl, 1691 QualType BaseType, 1692 const CXXBaseSpecifier *&DirectBaseSpec, 1693 const CXXBaseSpecifier *&VirtualBaseSpec) { 1694 // First, check for a direct base class. 1695 DirectBaseSpec = 0; 1696 for (CXXRecordDecl::base_class_const_iterator Base 1697 = ClassDecl->bases_begin(); 1698 Base != ClassDecl->bases_end(); ++Base) { 1699 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1700 // We found a direct base of this type. That's what we're 1701 // initializing. 1702 DirectBaseSpec = &*Base; 1703 break; 1704 } 1705 } 1706 1707 // Check for a virtual base class. 1708 // FIXME: We might be able to short-circuit this if we know in advance that 1709 // there are no virtual bases. 1710 VirtualBaseSpec = 0; 1711 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1712 // We haven't found a base yet; search the class hierarchy for a 1713 // virtual base class. 1714 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1715 /*DetectVirtual=*/false); 1716 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1717 BaseType, Paths)) { 1718 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1719 Path != Paths.end(); ++Path) { 1720 if (Path->back().Base->isVirtual()) { 1721 VirtualBaseSpec = Path->back().Base; 1722 break; 1723 } 1724 } 1725 } 1726 } 1727 1728 return DirectBaseSpec || VirtualBaseSpec; 1729} 1730 1731/// \brief Handle a C++ member initializer using braced-init-list syntax. 1732MemInitResult 1733Sema::ActOnMemInitializer(Decl *ConstructorD, 1734 Scope *S, 1735 CXXScopeSpec &SS, 1736 IdentifierInfo *MemberOrBase, 1737 ParsedType TemplateTypeTy, 1738 const DeclSpec &DS, 1739 SourceLocation IdLoc, 1740 Expr *InitList, 1741 SourceLocation EllipsisLoc) { 1742 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1743 DS, IdLoc, InitList, 1744 EllipsisLoc); 1745} 1746 1747/// \brief Handle a C++ member initializer using parentheses syntax. 1748MemInitResult 1749Sema::ActOnMemInitializer(Decl *ConstructorD, 1750 Scope *S, 1751 CXXScopeSpec &SS, 1752 IdentifierInfo *MemberOrBase, 1753 ParsedType TemplateTypeTy, 1754 const DeclSpec &DS, 1755 SourceLocation IdLoc, 1756 SourceLocation LParenLoc, 1757 Expr **Args, unsigned NumArgs, 1758 SourceLocation RParenLoc, 1759 SourceLocation EllipsisLoc) { 1760 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1761 RParenLoc); 1762 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1763 DS, IdLoc, List, EllipsisLoc); 1764} 1765 1766namespace { 1767 1768// Callback to only accept typo corrections that can be a valid C++ member 1769// intializer: either a non-static field member or a base class. 1770class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 1771 public: 1772 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 1773 : ClassDecl(ClassDecl) {} 1774 1775 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 1776 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 1777 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 1778 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 1779 else 1780 return isa<TypeDecl>(ND); 1781 } 1782 return false; 1783 } 1784 1785 private: 1786 CXXRecordDecl *ClassDecl; 1787}; 1788 1789} 1790 1791/// \brief Handle a C++ member initializer. 1792MemInitResult 1793Sema::BuildMemInitializer(Decl *ConstructorD, 1794 Scope *S, 1795 CXXScopeSpec &SS, 1796 IdentifierInfo *MemberOrBase, 1797 ParsedType TemplateTypeTy, 1798 const DeclSpec &DS, 1799 SourceLocation IdLoc, 1800 Expr *Init, 1801 SourceLocation EllipsisLoc) { 1802 if (!ConstructorD) 1803 return true; 1804 1805 AdjustDeclIfTemplate(ConstructorD); 1806 1807 CXXConstructorDecl *Constructor 1808 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1809 if (!Constructor) { 1810 // The user wrote a constructor initializer on a function that is 1811 // not a C++ constructor. Ignore the error for now, because we may 1812 // have more member initializers coming; we'll diagnose it just 1813 // once in ActOnMemInitializers. 1814 return true; 1815 } 1816 1817 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1818 1819 // C++ [class.base.init]p2: 1820 // Names in a mem-initializer-id are looked up in the scope of the 1821 // constructor's class and, if not found in that scope, are looked 1822 // up in the scope containing the constructor's definition. 1823 // [Note: if the constructor's class contains a member with the 1824 // same name as a direct or virtual base class of the class, a 1825 // mem-initializer-id naming the member or base class and composed 1826 // of a single identifier refers to the class member. A 1827 // mem-initializer-id for the hidden base class may be specified 1828 // using a qualified name. ] 1829 if (!SS.getScopeRep() && !TemplateTypeTy) { 1830 // Look for a member, first. 1831 DeclContext::lookup_result Result 1832 = ClassDecl->lookup(MemberOrBase); 1833 if (Result.first != Result.second) { 1834 ValueDecl *Member; 1835 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 1836 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 1837 if (EllipsisLoc.isValid()) 1838 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1839 << MemberOrBase 1840 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 1841 1842 return BuildMemberInitializer(Member, Init, IdLoc); 1843 } 1844 } 1845 } 1846 // It didn't name a member, so see if it names a class. 1847 QualType BaseType; 1848 TypeSourceInfo *TInfo = 0; 1849 1850 if (TemplateTypeTy) { 1851 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1852 } else if (DS.getTypeSpecType() == TST_decltype) { 1853 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 1854 } else { 1855 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1856 LookupParsedName(R, S, &SS); 1857 1858 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1859 if (!TyD) { 1860 if (R.isAmbiguous()) return true; 1861 1862 // We don't want access-control diagnostics here. 1863 R.suppressDiagnostics(); 1864 1865 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1866 bool NotUnknownSpecialization = false; 1867 DeclContext *DC = computeDeclContext(SS, false); 1868 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1869 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1870 1871 if (!NotUnknownSpecialization) { 1872 // When the scope specifier can refer to a member of an unknown 1873 // specialization, we take it as a type name. 1874 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1875 SS.getWithLocInContext(Context), 1876 *MemberOrBase, IdLoc); 1877 if (BaseType.isNull()) 1878 return true; 1879 1880 R.clear(); 1881 R.setLookupName(MemberOrBase); 1882 } 1883 } 1884 1885 // If no results were found, try to correct typos. 1886 TypoCorrection Corr; 1887 MemInitializerValidatorCCC Validator(ClassDecl); 1888 if (R.empty() && BaseType.isNull() && 1889 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1890 Validator, ClassDecl))) { 1891 std::string CorrectedStr(Corr.getAsString(getLangOpts())); 1892 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOpts())); 1893 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1894 // We have found a non-static data member with a similar 1895 // name to what was typed; complain and initialize that 1896 // member. 1897 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1898 << MemberOrBase << true << CorrectedQuotedStr 1899 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1900 Diag(Member->getLocation(), diag::note_previous_decl) 1901 << CorrectedQuotedStr; 1902 1903 return BuildMemberInitializer(Member, Init, IdLoc); 1904 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1905 const CXXBaseSpecifier *DirectBaseSpec; 1906 const CXXBaseSpecifier *VirtualBaseSpec; 1907 if (FindBaseInitializer(*this, ClassDecl, 1908 Context.getTypeDeclType(Type), 1909 DirectBaseSpec, VirtualBaseSpec)) { 1910 // We have found a direct or virtual base class with a 1911 // similar name to what was typed; complain and initialize 1912 // that base class. 1913 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1914 << MemberOrBase << false << CorrectedQuotedStr 1915 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1916 1917 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1918 : VirtualBaseSpec; 1919 Diag(BaseSpec->getLocStart(), 1920 diag::note_base_class_specified_here) 1921 << BaseSpec->getType() 1922 << BaseSpec->getSourceRange(); 1923 1924 TyD = Type; 1925 } 1926 } 1927 } 1928 1929 if (!TyD && BaseType.isNull()) { 1930 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1931 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 1932 return true; 1933 } 1934 } 1935 1936 if (BaseType.isNull()) { 1937 BaseType = Context.getTypeDeclType(TyD); 1938 if (SS.isSet()) { 1939 NestedNameSpecifier *Qualifier = 1940 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1941 1942 // FIXME: preserve source range information 1943 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1944 } 1945 } 1946 } 1947 1948 if (!TInfo) 1949 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1950 1951 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 1952} 1953 1954/// Checks a member initializer expression for cases where reference (or 1955/// pointer) members are bound to by-value parameters (or their addresses). 1956static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 1957 Expr *Init, 1958 SourceLocation IdLoc) { 1959 QualType MemberTy = Member->getType(); 1960 1961 // We only handle pointers and references currently. 1962 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 1963 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 1964 return; 1965 1966 const bool IsPointer = MemberTy->isPointerType(); 1967 if (IsPointer) { 1968 if (const UnaryOperator *Op 1969 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 1970 // The only case we're worried about with pointers requires taking the 1971 // address. 1972 if (Op->getOpcode() != UO_AddrOf) 1973 return; 1974 1975 Init = Op->getSubExpr(); 1976 } else { 1977 // We only handle address-of expression initializers for pointers. 1978 return; 1979 } 1980 } 1981 1982 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 1983 // Taking the address of a temporary will be diagnosed as a hard error. 1984 if (IsPointer) 1985 return; 1986 1987 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 1988 << Member << Init->getSourceRange(); 1989 } else if (const DeclRefExpr *DRE 1990 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 1991 // We only warn when referring to a non-reference parameter declaration. 1992 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 1993 if (!Parameter || Parameter->getType()->isReferenceType()) 1994 return; 1995 1996 S.Diag(Init->getExprLoc(), 1997 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 1998 : diag::warn_bind_ref_member_to_parameter) 1999 << Member << Parameter << Init->getSourceRange(); 2000 } else { 2001 // Other initializers are fine. 2002 return; 2003 } 2004 2005 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 2006 << (unsigned)IsPointer; 2007} 2008 2009/// Checks an initializer expression for use of uninitialized fields, such as 2010/// containing the field that is being initialized. Returns true if there is an 2011/// uninitialized field was used an updates the SourceLocation parameter; false 2012/// otherwise. 2013static bool InitExprContainsUninitializedFields(const Stmt *S, 2014 const ValueDecl *LhsField, 2015 SourceLocation *L) { 2016 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 2017 2018 if (isa<CallExpr>(S)) { 2019 // Do not descend into function calls or constructors, as the use 2020 // of an uninitialized field may be valid. One would have to inspect 2021 // the contents of the function/ctor to determine if it is safe or not. 2022 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 2023 // may be safe, depending on what the function/ctor does. 2024 return false; 2025 } 2026 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 2027 const NamedDecl *RhsField = ME->getMemberDecl(); 2028 2029 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 2030 // The member expression points to a static data member. 2031 assert(VD->isStaticDataMember() && 2032 "Member points to non-static data member!"); 2033 (void)VD; 2034 return false; 2035 } 2036 2037 if (isa<EnumConstantDecl>(RhsField)) { 2038 // The member expression points to an enum. 2039 return false; 2040 } 2041 2042 if (RhsField == LhsField) { 2043 // Initializing a field with itself. Throw a warning. 2044 // But wait; there are exceptions! 2045 // Exception #1: The field may not belong to this record. 2046 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 2047 const Expr *base = ME->getBase(); 2048 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 2049 // Even though the field matches, it does not belong to this record. 2050 return false; 2051 } 2052 // None of the exceptions triggered; return true to indicate an 2053 // uninitialized field was used. 2054 *L = ME->getMemberLoc(); 2055 return true; 2056 } 2057 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 2058 // sizeof/alignof doesn't reference contents, do not warn. 2059 return false; 2060 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 2061 // address-of doesn't reference contents (the pointer may be dereferenced 2062 // in the same expression but it would be rare; and weird). 2063 if (UOE->getOpcode() == UO_AddrOf) 2064 return false; 2065 } 2066 for (Stmt::const_child_range it = S->children(); it; ++it) { 2067 if (!*it) { 2068 // An expression such as 'member(arg ?: "")' may trigger this. 2069 continue; 2070 } 2071 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 2072 return true; 2073 } 2074 return false; 2075} 2076 2077MemInitResult 2078Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2079 SourceLocation IdLoc) { 2080 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2081 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2082 assert((DirectMember || IndirectMember) && 2083 "Member must be a FieldDecl or IndirectFieldDecl"); 2084 2085 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2086 return true; 2087 2088 if (Member->isInvalidDecl()) 2089 return true; 2090 2091 // Diagnose value-uses of fields to initialize themselves, e.g. 2092 // foo(foo) 2093 // where foo is not also a parameter to the constructor. 2094 // TODO: implement -Wuninitialized and fold this into that framework. 2095 Expr **Args; 2096 unsigned NumArgs; 2097 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2098 Args = ParenList->getExprs(); 2099 NumArgs = ParenList->getNumExprs(); 2100 } else { 2101 InitListExpr *InitList = cast<InitListExpr>(Init); 2102 Args = InitList->getInits(); 2103 NumArgs = InitList->getNumInits(); 2104 } 2105 for (unsigned i = 0; i < NumArgs; ++i) { 2106 SourceLocation L; 2107 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 2108 // FIXME: Return true in the case when other fields are used before being 2109 // uninitialized. For example, let this field be the i'th field. When 2110 // initializing the i'th field, throw a warning if any of the >= i'th 2111 // fields are used, as they are not yet initialized. 2112 // Right now we are only handling the case where the i'th field uses 2113 // itself in its initializer. 2114 Diag(L, diag::warn_field_is_uninit); 2115 } 2116 } 2117 2118 SourceRange InitRange = Init->getSourceRange(); 2119 2120 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2121 // Can't check initialization for a member of dependent type or when 2122 // any of the arguments are type-dependent expressions. 2123 DiscardCleanupsInEvaluationContext(); 2124 } else { 2125 bool InitList = false; 2126 if (isa<InitListExpr>(Init)) { 2127 InitList = true; 2128 Args = &Init; 2129 NumArgs = 1; 2130 2131 if (isStdInitializerList(Member->getType(), 0)) { 2132 Diag(IdLoc, diag::warn_dangling_std_initializer_list) 2133 << /*at end of ctor*/1 << InitRange; 2134 } 2135 } 2136 2137 // Initialize the member. 2138 InitializedEntity MemberEntity = 2139 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2140 : InitializedEntity::InitializeMember(IndirectMember, 0); 2141 InitializationKind Kind = 2142 InitList ? InitializationKind::CreateDirectList(IdLoc) 2143 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2144 InitRange.getEnd()); 2145 2146 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 2147 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, 2148 MultiExprArg(*this, Args, NumArgs), 2149 0); 2150 if (MemberInit.isInvalid()) 2151 return true; 2152 2153 CheckImplicitConversions(MemberInit.get(), 2154 InitRange.getBegin()); 2155 2156 // C++0x [class.base.init]p7: 2157 // The initialization of each base and member constitutes a 2158 // full-expression. 2159 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2160 if (MemberInit.isInvalid()) 2161 return true; 2162 2163 // If we are in a dependent context, template instantiation will 2164 // perform this type-checking again. Just save the arguments that we 2165 // received. 2166 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2167 // of the information that we have about the member 2168 // initializer. However, deconstructing the ASTs is a dicey process, 2169 // and this approach is far more likely to get the corner cases right. 2170 if (CurContext->isDependentContext()) { 2171 // The existing Init will do fine. 2172 } else { 2173 Init = MemberInit.get(); 2174 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2175 } 2176 } 2177 2178 if (DirectMember) { 2179 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2180 InitRange.getBegin(), Init, 2181 InitRange.getEnd()); 2182 } else { 2183 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2184 InitRange.getBegin(), Init, 2185 InitRange.getEnd()); 2186 } 2187} 2188 2189MemInitResult 2190Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2191 CXXRecordDecl *ClassDecl) { 2192 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2193 if (!LangOpts.CPlusPlus0x) 2194 return Diag(NameLoc, diag::err_delegating_ctor) 2195 << TInfo->getTypeLoc().getLocalSourceRange(); 2196 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2197 2198 bool InitList = true; 2199 Expr **Args = &Init; 2200 unsigned NumArgs = 1; 2201 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2202 InitList = false; 2203 Args = ParenList->getExprs(); 2204 NumArgs = ParenList->getNumExprs(); 2205 } 2206 2207 SourceRange InitRange = Init->getSourceRange(); 2208 // Initialize the object. 2209 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2210 QualType(ClassDecl->getTypeForDecl(), 0)); 2211 InitializationKind Kind = 2212 InitList ? InitializationKind::CreateDirectList(NameLoc) 2213 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2214 InitRange.getEnd()); 2215 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 2216 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2217 MultiExprArg(*this, Args,NumArgs), 2218 0); 2219 if (DelegationInit.isInvalid()) 2220 return true; 2221 2222 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2223 "Delegating constructor with no target?"); 2224 2225 CheckImplicitConversions(DelegationInit.get(), InitRange.getBegin()); 2226 2227 // C++0x [class.base.init]p7: 2228 // The initialization of each base and member constitutes a 2229 // full-expression. 2230 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2231 if (DelegationInit.isInvalid()) 2232 return true; 2233 2234 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2235 DelegationInit.takeAs<Expr>(), 2236 InitRange.getEnd()); 2237} 2238 2239MemInitResult 2240Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2241 Expr *Init, CXXRecordDecl *ClassDecl, 2242 SourceLocation EllipsisLoc) { 2243 SourceLocation BaseLoc 2244 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2245 2246 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2247 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2248 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2249 2250 // C++ [class.base.init]p2: 2251 // [...] Unless the mem-initializer-id names a nonstatic data 2252 // member of the constructor's class or a direct or virtual base 2253 // of that class, the mem-initializer is ill-formed. A 2254 // mem-initializer-list can initialize a base class using any 2255 // name that denotes that base class type. 2256 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2257 2258 SourceRange InitRange = Init->getSourceRange(); 2259 if (EllipsisLoc.isValid()) { 2260 // This is a pack expansion. 2261 if (!BaseType->containsUnexpandedParameterPack()) { 2262 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2263 << SourceRange(BaseLoc, InitRange.getEnd()); 2264 2265 EllipsisLoc = SourceLocation(); 2266 } 2267 } else { 2268 // Check for any unexpanded parameter packs. 2269 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2270 return true; 2271 2272 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2273 return true; 2274 } 2275 2276 // Check for direct and virtual base classes. 2277 const CXXBaseSpecifier *DirectBaseSpec = 0; 2278 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2279 if (!Dependent) { 2280 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2281 BaseType)) 2282 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2283 2284 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2285 VirtualBaseSpec); 2286 2287 // C++ [base.class.init]p2: 2288 // Unless the mem-initializer-id names a nonstatic data member of the 2289 // constructor's class or a direct or virtual base of that class, the 2290 // mem-initializer is ill-formed. 2291 if (!DirectBaseSpec && !VirtualBaseSpec) { 2292 // If the class has any dependent bases, then it's possible that 2293 // one of those types will resolve to the same type as 2294 // BaseType. Therefore, just treat this as a dependent base 2295 // class initialization. FIXME: Should we try to check the 2296 // initialization anyway? It seems odd. 2297 if (ClassDecl->hasAnyDependentBases()) 2298 Dependent = true; 2299 else 2300 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2301 << BaseType << Context.getTypeDeclType(ClassDecl) 2302 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2303 } 2304 } 2305 2306 if (Dependent) { 2307 DiscardCleanupsInEvaluationContext(); 2308 2309 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2310 /*IsVirtual=*/false, 2311 InitRange.getBegin(), Init, 2312 InitRange.getEnd(), EllipsisLoc); 2313 } 2314 2315 // C++ [base.class.init]p2: 2316 // If a mem-initializer-id is ambiguous because it designates both 2317 // a direct non-virtual base class and an inherited virtual base 2318 // class, the mem-initializer is ill-formed. 2319 if (DirectBaseSpec && VirtualBaseSpec) 2320 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2321 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2322 2323 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2324 if (!BaseSpec) 2325 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2326 2327 // Initialize the base. 2328 bool InitList = true; 2329 Expr **Args = &Init; 2330 unsigned NumArgs = 1; 2331 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2332 InitList = false; 2333 Args = ParenList->getExprs(); 2334 NumArgs = ParenList->getNumExprs(); 2335 } 2336 2337 InitializedEntity BaseEntity = 2338 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2339 InitializationKind Kind = 2340 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2341 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2342 InitRange.getEnd()); 2343 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 2344 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, 2345 MultiExprArg(*this, Args, NumArgs), 2346 0); 2347 if (BaseInit.isInvalid()) 2348 return true; 2349 2350 CheckImplicitConversions(BaseInit.get(), InitRange.getBegin()); 2351 2352 // C++0x [class.base.init]p7: 2353 // The initialization of each base and member constitutes a 2354 // full-expression. 2355 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2356 if (BaseInit.isInvalid()) 2357 return true; 2358 2359 // If we are in a dependent context, template instantiation will 2360 // perform this type-checking again. Just save the arguments that we 2361 // received in a ParenListExpr. 2362 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2363 // of the information that we have about the base 2364 // initializer. However, deconstructing the ASTs is a dicey process, 2365 // and this approach is far more likely to get the corner cases right. 2366 if (CurContext->isDependentContext()) 2367 BaseInit = Owned(Init); 2368 2369 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2370 BaseSpec->isVirtual(), 2371 InitRange.getBegin(), 2372 BaseInit.takeAs<Expr>(), 2373 InitRange.getEnd(), EllipsisLoc); 2374} 2375 2376// Create a static_cast\<T&&>(expr). 2377static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2378 QualType ExprType = E->getType(); 2379 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2380 SourceLocation ExprLoc = E->getLocStart(); 2381 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2382 TargetType, ExprLoc); 2383 2384 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2385 SourceRange(ExprLoc, ExprLoc), 2386 E->getSourceRange()).take(); 2387} 2388 2389/// ImplicitInitializerKind - How an implicit base or member initializer should 2390/// initialize its base or member. 2391enum ImplicitInitializerKind { 2392 IIK_Default, 2393 IIK_Copy, 2394 IIK_Move 2395}; 2396 2397static bool 2398BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2399 ImplicitInitializerKind ImplicitInitKind, 2400 CXXBaseSpecifier *BaseSpec, 2401 bool IsInheritedVirtualBase, 2402 CXXCtorInitializer *&CXXBaseInit) { 2403 InitializedEntity InitEntity 2404 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2405 IsInheritedVirtualBase); 2406 2407 ExprResult BaseInit; 2408 2409 switch (ImplicitInitKind) { 2410 case IIK_Default: { 2411 InitializationKind InitKind 2412 = InitializationKind::CreateDefault(Constructor->getLocation()); 2413 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2414 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2415 MultiExprArg(SemaRef, 0, 0)); 2416 break; 2417 } 2418 2419 case IIK_Move: 2420 case IIK_Copy: { 2421 bool Moving = ImplicitInitKind == IIK_Move; 2422 ParmVarDecl *Param = Constructor->getParamDecl(0); 2423 QualType ParamType = Param->getType().getNonReferenceType(); 2424 2425 Expr *CopyCtorArg = 2426 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2427 SourceLocation(), Param, false, 2428 Constructor->getLocation(), ParamType, 2429 VK_LValue, 0); 2430 2431 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2432 2433 // Cast to the base class to avoid ambiguities. 2434 QualType ArgTy = 2435 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2436 ParamType.getQualifiers()); 2437 2438 if (Moving) { 2439 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2440 } 2441 2442 CXXCastPath BasePath; 2443 BasePath.push_back(BaseSpec); 2444 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2445 CK_UncheckedDerivedToBase, 2446 Moving ? VK_XValue : VK_LValue, 2447 &BasePath).take(); 2448 2449 InitializationKind InitKind 2450 = InitializationKind::CreateDirect(Constructor->getLocation(), 2451 SourceLocation(), SourceLocation()); 2452 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2453 &CopyCtorArg, 1); 2454 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2455 MultiExprArg(&CopyCtorArg, 1)); 2456 break; 2457 } 2458 } 2459 2460 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2461 if (BaseInit.isInvalid()) 2462 return true; 2463 2464 CXXBaseInit = 2465 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2466 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2467 SourceLocation()), 2468 BaseSpec->isVirtual(), 2469 SourceLocation(), 2470 BaseInit.takeAs<Expr>(), 2471 SourceLocation(), 2472 SourceLocation()); 2473 2474 return false; 2475} 2476 2477static bool RefersToRValueRef(Expr *MemRef) { 2478 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2479 return Referenced->getType()->isRValueReferenceType(); 2480} 2481 2482static bool 2483BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2484 ImplicitInitializerKind ImplicitInitKind, 2485 FieldDecl *Field, IndirectFieldDecl *Indirect, 2486 CXXCtorInitializer *&CXXMemberInit) { 2487 if (Field->isInvalidDecl()) 2488 return true; 2489 2490 SourceLocation Loc = Constructor->getLocation(); 2491 2492 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2493 bool Moving = ImplicitInitKind == IIK_Move; 2494 ParmVarDecl *Param = Constructor->getParamDecl(0); 2495 QualType ParamType = Param->getType().getNonReferenceType(); 2496 2497 // Suppress copying zero-width bitfields. 2498 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2499 return false; 2500 2501 Expr *MemberExprBase = 2502 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2503 SourceLocation(), Param, false, 2504 Loc, ParamType, VK_LValue, 0); 2505 2506 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2507 2508 if (Moving) { 2509 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2510 } 2511 2512 // Build a reference to this field within the parameter. 2513 CXXScopeSpec SS; 2514 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2515 Sema::LookupMemberName); 2516 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2517 : cast<ValueDecl>(Field), AS_public); 2518 MemberLookup.resolveKind(); 2519 ExprResult CtorArg 2520 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2521 ParamType, Loc, 2522 /*IsArrow=*/false, 2523 SS, 2524 /*TemplateKWLoc=*/SourceLocation(), 2525 /*FirstQualifierInScope=*/0, 2526 MemberLookup, 2527 /*TemplateArgs=*/0); 2528 if (CtorArg.isInvalid()) 2529 return true; 2530 2531 // C++11 [class.copy]p15: 2532 // - if a member m has rvalue reference type T&&, it is direct-initialized 2533 // with static_cast<T&&>(x.m); 2534 if (RefersToRValueRef(CtorArg.get())) { 2535 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2536 } 2537 2538 // When the field we are copying is an array, create index variables for 2539 // each dimension of the array. We use these index variables to subscript 2540 // the source array, and other clients (e.g., CodeGen) will perform the 2541 // necessary iteration with these index variables. 2542 SmallVector<VarDecl *, 4> IndexVariables; 2543 QualType BaseType = Field->getType(); 2544 QualType SizeType = SemaRef.Context.getSizeType(); 2545 bool InitializingArray = false; 2546 while (const ConstantArrayType *Array 2547 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2548 InitializingArray = true; 2549 // Create the iteration variable for this array index. 2550 IdentifierInfo *IterationVarName = 0; 2551 { 2552 SmallString<8> Str; 2553 llvm::raw_svector_ostream OS(Str); 2554 OS << "__i" << IndexVariables.size(); 2555 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2556 } 2557 VarDecl *IterationVar 2558 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2559 IterationVarName, SizeType, 2560 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2561 SC_None, SC_None); 2562 IndexVariables.push_back(IterationVar); 2563 2564 // Create a reference to the iteration variable. 2565 ExprResult IterationVarRef 2566 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2567 assert(!IterationVarRef.isInvalid() && 2568 "Reference to invented variable cannot fail!"); 2569 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2570 assert(!IterationVarRef.isInvalid() && 2571 "Conversion of invented variable cannot fail!"); 2572 2573 // Subscript the array with this iteration variable. 2574 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2575 IterationVarRef.take(), 2576 Loc); 2577 if (CtorArg.isInvalid()) 2578 return true; 2579 2580 BaseType = Array->getElementType(); 2581 } 2582 2583 // The array subscript expression is an lvalue, which is wrong for moving. 2584 if (Moving && InitializingArray) 2585 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2586 2587 // Construct the entity that we will be initializing. For an array, this 2588 // will be first element in the array, which may require several levels 2589 // of array-subscript entities. 2590 SmallVector<InitializedEntity, 4> Entities; 2591 Entities.reserve(1 + IndexVariables.size()); 2592 if (Indirect) 2593 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2594 else 2595 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2596 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2597 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2598 0, 2599 Entities.back())); 2600 2601 // Direct-initialize to use the copy constructor. 2602 InitializationKind InitKind = 2603 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2604 2605 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2606 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2607 &CtorArgE, 1); 2608 2609 ExprResult MemberInit 2610 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2611 MultiExprArg(&CtorArgE, 1)); 2612 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2613 if (MemberInit.isInvalid()) 2614 return true; 2615 2616 if (Indirect) { 2617 assert(IndexVariables.size() == 0 && 2618 "Indirect field improperly initialized"); 2619 CXXMemberInit 2620 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2621 Loc, Loc, 2622 MemberInit.takeAs<Expr>(), 2623 Loc); 2624 } else 2625 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2626 Loc, MemberInit.takeAs<Expr>(), 2627 Loc, 2628 IndexVariables.data(), 2629 IndexVariables.size()); 2630 return false; 2631 } 2632 2633 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2634 2635 QualType FieldBaseElementType = 2636 SemaRef.Context.getBaseElementType(Field->getType()); 2637 2638 if (FieldBaseElementType->isRecordType()) { 2639 InitializedEntity InitEntity 2640 = Indirect? InitializedEntity::InitializeMember(Indirect) 2641 : InitializedEntity::InitializeMember(Field); 2642 InitializationKind InitKind = 2643 InitializationKind::CreateDefault(Loc); 2644 2645 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2646 ExprResult MemberInit = 2647 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2648 2649 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2650 if (MemberInit.isInvalid()) 2651 return true; 2652 2653 if (Indirect) 2654 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2655 Indirect, Loc, 2656 Loc, 2657 MemberInit.get(), 2658 Loc); 2659 else 2660 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2661 Field, Loc, Loc, 2662 MemberInit.get(), 2663 Loc); 2664 return false; 2665 } 2666 2667 if (!Field->getParent()->isUnion()) { 2668 if (FieldBaseElementType->isReferenceType()) { 2669 SemaRef.Diag(Constructor->getLocation(), 2670 diag::err_uninitialized_member_in_ctor) 2671 << (int)Constructor->isImplicit() 2672 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2673 << 0 << Field->getDeclName(); 2674 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2675 return true; 2676 } 2677 2678 if (FieldBaseElementType.isConstQualified()) { 2679 SemaRef.Diag(Constructor->getLocation(), 2680 diag::err_uninitialized_member_in_ctor) 2681 << (int)Constructor->isImplicit() 2682 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2683 << 1 << Field->getDeclName(); 2684 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2685 return true; 2686 } 2687 } 2688 2689 if (SemaRef.getLangOpts().ObjCAutoRefCount && 2690 FieldBaseElementType->isObjCRetainableType() && 2691 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2692 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2693 // Instant objects: 2694 // Default-initialize Objective-C pointers to NULL. 2695 CXXMemberInit 2696 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2697 Loc, Loc, 2698 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2699 Loc); 2700 return false; 2701 } 2702 2703 // Nothing to initialize. 2704 CXXMemberInit = 0; 2705 return false; 2706} 2707 2708namespace { 2709struct BaseAndFieldInfo { 2710 Sema &S; 2711 CXXConstructorDecl *Ctor; 2712 bool AnyErrorsInInits; 2713 ImplicitInitializerKind IIK; 2714 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2715 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2716 2717 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2718 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2719 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2720 if (Generated && Ctor->isCopyConstructor()) 2721 IIK = IIK_Copy; 2722 else if (Generated && Ctor->isMoveConstructor()) 2723 IIK = IIK_Move; 2724 else 2725 IIK = IIK_Default; 2726 } 2727 2728 bool isImplicitCopyOrMove() const { 2729 switch (IIK) { 2730 case IIK_Copy: 2731 case IIK_Move: 2732 return true; 2733 2734 case IIK_Default: 2735 return false; 2736 } 2737 2738 llvm_unreachable("Invalid ImplicitInitializerKind!"); 2739 } 2740}; 2741} 2742 2743/// \brief Determine whether the given indirect field declaration is somewhere 2744/// within an anonymous union. 2745static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2746 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2747 CEnd = F->chain_end(); 2748 C != CEnd; ++C) 2749 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2750 if (Record->isUnion()) 2751 return true; 2752 2753 return false; 2754} 2755 2756/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2757/// array type. 2758static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2759 if (T->isIncompleteArrayType()) 2760 return true; 2761 2762 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2763 if (!ArrayT->getSize()) 2764 return true; 2765 2766 T = ArrayT->getElementType(); 2767 } 2768 2769 return false; 2770} 2771 2772static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2773 FieldDecl *Field, 2774 IndirectFieldDecl *Indirect = 0) { 2775 2776 // Overwhelmingly common case: we have a direct initializer for this field. 2777 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2778 Info.AllToInit.push_back(Init); 2779 return false; 2780 } 2781 2782 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2783 // has a brace-or-equal-initializer, the entity is initialized as specified 2784 // in [dcl.init]. 2785 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 2786 CXXCtorInitializer *Init; 2787 if (Indirect) 2788 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2789 SourceLocation(), 2790 SourceLocation(), 0, 2791 SourceLocation()); 2792 else 2793 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2794 SourceLocation(), 2795 SourceLocation(), 0, 2796 SourceLocation()); 2797 Info.AllToInit.push_back(Init); 2798 return false; 2799 } 2800 2801 // Don't build an implicit initializer for union members if none was 2802 // explicitly specified. 2803 if (Field->getParent()->isUnion() || 2804 (Indirect && isWithinAnonymousUnion(Indirect))) 2805 return false; 2806 2807 // Don't initialize incomplete or zero-length arrays. 2808 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 2809 return false; 2810 2811 // Don't try to build an implicit initializer if there were semantic 2812 // errors in any of the initializers (and therefore we might be 2813 // missing some that the user actually wrote). 2814 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2815 return false; 2816 2817 CXXCtorInitializer *Init = 0; 2818 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2819 Indirect, Init)) 2820 return true; 2821 2822 if (Init) 2823 Info.AllToInit.push_back(Init); 2824 2825 return false; 2826} 2827 2828bool 2829Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2830 CXXCtorInitializer *Initializer) { 2831 assert(Initializer->isDelegatingInitializer()); 2832 Constructor->setNumCtorInitializers(1); 2833 CXXCtorInitializer **initializer = 2834 new (Context) CXXCtorInitializer*[1]; 2835 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2836 Constructor->setCtorInitializers(initializer); 2837 2838 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2839 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 2840 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2841 } 2842 2843 DelegatingCtorDecls.push_back(Constructor); 2844 2845 return false; 2846} 2847 2848bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2849 CXXCtorInitializer **Initializers, 2850 unsigned NumInitializers, 2851 bool AnyErrors) { 2852 if (Constructor->isDependentContext()) { 2853 // Just store the initializers as written, they will be checked during 2854 // instantiation. 2855 if (NumInitializers > 0) { 2856 Constructor->setNumCtorInitializers(NumInitializers); 2857 CXXCtorInitializer **baseOrMemberInitializers = 2858 new (Context) CXXCtorInitializer*[NumInitializers]; 2859 memcpy(baseOrMemberInitializers, Initializers, 2860 NumInitializers * sizeof(CXXCtorInitializer*)); 2861 Constructor->setCtorInitializers(baseOrMemberInitializers); 2862 } 2863 2864 return false; 2865 } 2866 2867 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2868 2869 // We need to build the initializer AST according to order of construction 2870 // and not what user specified in the Initializers list. 2871 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2872 if (!ClassDecl) 2873 return true; 2874 2875 bool HadError = false; 2876 2877 for (unsigned i = 0; i < NumInitializers; i++) { 2878 CXXCtorInitializer *Member = Initializers[i]; 2879 2880 if (Member->isBaseInitializer()) 2881 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2882 else 2883 Info.AllBaseFields[Member->getAnyMember()] = Member; 2884 } 2885 2886 // Keep track of the direct virtual bases. 2887 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2888 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2889 E = ClassDecl->bases_end(); I != E; ++I) { 2890 if (I->isVirtual()) 2891 DirectVBases.insert(I); 2892 } 2893 2894 // Push virtual bases before others. 2895 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2896 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2897 2898 if (CXXCtorInitializer *Value 2899 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2900 Info.AllToInit.push_back(Value); 2901 } else if (!AnyErrors) { 2902 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2903 CXXCtorInitializer *CXXBaseInit; 2904 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2905 VBase, IsInheritedVirtualBase, 2906 CXXBaseInit)) { 2907 HadError = true; 2908 continue; 2909 } 2910 2911 Info.AllToInit.push_back(CXXBaseInit); 2912 } 2913 } 2914 2915 // Non-virtual bases. 2916 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2917 E = ClassDecl->bases_end(); Base != E; ++Base) { 2918 // Virtuals are in the virtual base list and already constructed. 2919 if (Base->isVirtual()) 2920 continue; 2921 2922 if (CXXCtorInitializer *Value 2923 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2924 Info.AllToInit.push_back(Value); 2925 } else if (!AnyErrors) { 2926 CXXCtorInitializer *CXXBaseInit; 2927 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2928 Base, /*IsInheritedVirtualBase=*/false, 2929 CXXBaseInit)) { 2930 HadError = true; 2931 continue; 2932 } 2933 2934 Info.AllToInit.push_back(CXXBaseInit); 2935 } 2936 } 2937 2938 // Fields. 2939 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 2940 MemEnd = ClassDecl->decls_end(); 2941 Mem != MemEnd; ++Mem) { 2942 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 2943 // C++ [class.bit]p2: 2944 // A declaration for a bit-field that omits the identifier declares an 2945 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 2946 // initialized. 2947 if (F->isUnnamedBitfield()) 2948 continue; 2949 2950 // If we're not generating the implicit copy/move constructor, then we'll 2951 // handle anonymous struct/union fields based on their individual 2952 // indirect fields. 2953 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 2954 continue; 2955 2956 if (CollectFieldInitializer(*this, Info, F)) 2957 HadError = true; 2958 continue; 2959 } 2960 2961 // Beyond this point, we only consider default initialization. 2962 if (Info.IIK != IIK_Default) 2963 continue; 2964 2965 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 2966 if (F->getType()->isIncompleteArrayType()) { 2967 assert(ClassDecl->hasFlexibleArrayMember() && 2968 "Incomplete array type is not valid"); 2969 continue; 2970 } 2971 2972 // Initialize each field of an anonymous struct individually. 2973 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 2974 HadError = true; 2975 2976 continue; 2977 } 2978 } 2979 2980 NumInitializers = Info.AllToInit.size(); 2981 if (NumInitializers > 0) { 2982 Constructor->setNumCtorInitializers(NumInitializers); 2983 CXXCtorInitializer **baseOrMemberInitializers = 2984 new (Context) CXXCtorInitializer*[NumInitializers]; 2985 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2986 NumInitializers * sizeof(CXXCtorInitializer*)); 2987 Constructor->setCtorInitializers(baseOrMemberInitializers); 2988 2989 // Constructors implicitly reference the base and member 2990 // destructors. 2991 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2992 Constructor->getParent()); 2993 } 2994 2995 return HadError; 2996} 2997 2998static void *GetKeyForTopLevelField(FieldDecl *Field) { 2999 // For anonymous unions, use the class declaration as the key. 3000 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 3001 if (RT->getDecl()->isAnonymousStructOrUnion()) 3002 return static_cast<void *>(RT->getDecl()); 3003 } 3004 return static_cast<void *>(Field); 3005} 3006 3007static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 3008 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 3009} 3010 3011static void *GetKeyForMember(ASTContext &Context, 3012 CXXCtorInitializer *Member) { 3013 if (!Member->isAnyMemberInitializer()) 3014 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3015 3016 // For fields injected into the class via declaration of an anonymous union, 3017 // use its anonymous union class declaration as the unique key. 3018 FieldDecl *Field = Member->getAnyMember(); 3019 3020 // If the field is a member of an anonymous struct or union, our key 3021 // is the anonymous record decl that's a direct child of the class. 3022 RecordDecl *RD = Field->getParent(); 3023 if (RD->isAnonymousStructOrUnion()) { 3024 while (true) { 3025 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 3026 if (Parent->isAnonymousStructOrUnion()) 3027 RD = Parent; 3028 else 3029 break; 3030 } 3031 3032 return static_cast<void *>(RD); 3033 } 3034 3035 return static_cast<void *>(Field); 3036} 3037 3038static void 3039DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 3040 const CXXConstructorDecl *Constructor, 3041 CXXCtorInitializer **Inits, 3042 unsigned NumInits) { 3043 if (Constructor->getDeclContext()->isDependentContext()) 3044 return; 3045 3046 // Don't check initializers order unless the warning is enabled at the 3047 // location of at least one initializer. 3048 bool ShouldCheckOrder = false; 3049 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3050 CXXCtorInitializer *Init = Inits[InitIndex]; 3051 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3052 Init->getSourceLocation()) 3053 != DiagnosticsEngine::Ignored) { 3054 ShouldCheckOrder = true; 3055 break; 3056 } 3057 } 3058 if (!ShouldCheckOrder) 3059 return; 3060 3061 // Build the list of bases and members in the order that they'll 3062 // actually be initialized. The explicit initializers should be in 3063 // this same order but may be missing things. 3064 SmallVector<const void*, 32> IdealInitKeys; 3065 3066 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3067 3068 // 1. Virtual bases. 3069 for (CXXRecordDecl::base_class_const_iterator VBase = 3070 ClassDecl->vbases_begin(), 3071 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3072 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3073 3074 // 2. Non-virtual bases. 3075 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3076 E = ClassDecl->bases_end(); Base != E; ++Base) { 3077 if (Base->isVirtual()) 3078 continue; 3079 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3080 } 3081 3082 // 3. Direct fields. 3083 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3084 E = ClassDecl->field_end(); Field != E; ++Field) { 3085 if (Field->isUnnamedBitfield()) 3086 continue; 3087 3088 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 3089 } 3090 3091 unsigned NumIdealInits = IdealInitKeys.size(); 3092 unsigned IdealIndex = 0; 3093 3094 CXXCtorInitializer *PrevInit = 0; 3095 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3096 CXXCtorInitializer *Init = Inits[InitIndex]; 3097 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3098 3099 // Scan forward to try to find this initializer in the idealized 3100 // initializers list. 3101 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3102 if (InitKey == IdealInitKeys[IdealIndex]) 3103 break; 3104 3105 // If we didn't find this initializer, it must be because we 3106 // scanned past it on a previous iteration. That can only 3107 // happen if we're out of order; emit a warning. 3108 if (IdealIndex == NumIdealInits && PrevInit) { 3109 Sema::SemaDiagnosticBuilder D = 3110 SemaRef.Diag(PrevInit->getSourceLocation(), 3111 diag::warn_initializer_out_of_order); 3112 3113 if (PrevInit->isAnyMemberInitializer()) 3114 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3115 else 3116 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3117 3118 if (Init->isAnyMemberInitializer()) 3119 D << 0 << Init->getAnyMember()->getDeclName(); 3120 else 3121 D << 1 << Init->getTypeSourceInfo()->getType(); 3122 3123 // Move back to the initializer's location in the ideal list. 3124 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3125 if (InitKey == IdealInitKeys[IdealIndex]) 3126 break; 3127 3128 assert(IdealIndex != NumIdealInits && 3129 "initializer not found in initializer list"); 3130 } 3131 3132 PrevInit = Init; 3133 } 3134} 3135 3136namespace { 3137bool CheckRedundantInit(Sema &S, 3138 CXXCtorInitializer *Init, 3139 CXXCtorInitializer *&PrevInit) { 3140 if (!PrevInit) { 3141 PrevInit = Init; 3142 return false; 3143 } 3144 3145 if (FieldDecl *Field = Init->getMember()) 3146 S.Diag(Init->getSourceLocation(), 3147 diag::err_multiple_mem_initialization) 3148 << Field->getDeclName() 3149 << Init->getSourceRange(); 3150 else { 3151 const Type *BaseClass = Init->getBaseClass(); 3152 assert(BaseClass && "neither field nor base"); 3153 S.Diag(Init->getSourceLocation(), 3154 diag::err_multiple_base_initialization) 3155 << QualType(BaseClass, 0) 3156 << Init->getSourceRange(); 3157 } 3158 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3159 << 0 << PrevInit->getSourceRange(); 3160 3161 return true; 3162} 3163 3164typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3165typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3166 3167bool CheckRedundantUnionInit(Sema &S, 3168 CXXCtorInitializer *Init, 3169 RedundantUnionMap &Unions) { 3170 FieldDecl *Field = Init->getAnyMember(); 3171 RecordDecl *Parent = Field->getParent(); 3172 NamedDecl *Child = Field; 3173 3174 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3175 if (Parent->isUnion()) { 3176 UnionEntry &En = Unions[Parent]; 3177 if (En.first && En.first != Child) { 3178 S.Diag(Init->getSourceLocation(), 3179 diag::err_multiple_mem_union_initialization) 3180 << Field->getDeclName() 3181 << Init->getSourceRange(); 3182 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3183 << 0 << En.second->getSourceRange(); 3184 return true; 3185 } 3186 if (!En.first) { 3187 En.first = Child; 3188 En.second = Init; 3189 } 3190 if (!Parent->isAnonymousStructOrUnion()) 3191 return false; 3192 } 3193 3194 Child = Parent; 3195 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3196 } 3197 3198 return false; 3199} 3200} 3201 3202/// ActOnMemInitializers - Handle the member initializers for a constructor. 3203void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3204 SourceLocation ColonLoc, 3205 CXXCtorInitializer **meminits, 3206 unsigned NumMemInits, 3207 bool AnyErrors) { 3208 if (!ConstructorDecl) 3209 return; 3210 3211 AdjustDeclIfTemplate(ConstructorDecl); 3212 3213 CXXConstructorDecl *Constructor 3214 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3215 3216 if (!Constructor) { 3217 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3218 return; 3219 } 3220 3221 CXXCtorInitializer **MemInits = 3222 reinterpret_cast<CXXCtorInitializer **>(meminits); 3223 3224 // Mapping for the duplicate initializers check. 3225 // For member initializers, this is keyed with a FieldDecl*. 3226 // For base initializers, this is keyed with a Type*. 3227 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3228 3229 // Mapping for the inconsistent anonymous-union initializers check. 3230 RedundantUnionMap MemberUnions; 3231 3232 bool HadError = false; 3233 for (unsigned i = 0; i < NumMemInits; i++) { 3234 CXXCtorInitializer *Init = MemInits[i]; 3235 3236 // Set the source order index. 3237 Init->setSourceOrder(i); 3238 3239 if (Init->isAnyMemberInitializer()) { 3240 FieldDecl *Field = Init->getAnyMember(); 3241 if (CheckRedundantInit(*this, Init, Members[Field]) || 3242 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3243 HadError = true; 3244 } else if (Init->isBaseInitializer()) { 3245 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3246 if (CheckRedundantInit(*this, Init, Members[Key])) 3247 HadError = true; 3248 } else { 3249 assert(Init->isDelegatingInitializer()); 3250 // This must be the only initializer 3251 if (i != 0 || NumMemInits > 1) { 3252 Diag(MemInits[0]->getSourceLocation(), 3253 diag::err_delegating_initializer_alone) 3254 << MemInits[0]->getSourceRange(); 3255 HadError = true; 3256 // We will treat this as being the only initializer. 3257 } 3258 SetDelegatingInitializer(Constructor, MemInits[i]); 3259 // Return immediately as the initializer is set. 3260 return; 3261 } 3262 } 3263 3264 if (HadError) 3265 return; 3266 3267 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3268 3269 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3270} 3271 3272void 3273Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3274 CXXRecordDecl *ClassDecl) { 3275 // Ignore dependent contexts. Also ignore unions, since their members never 3276 // have destructors implicitly called. 3277 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3278 return; 3279 3280 // FIXME: all the access-control diagnostics are positioned on the 3281 // field/base declaration. That's probably good; that said, the 3282 // user might reasonably want to know why the destructor is being 3283 // emitted, and we currently don't say. 3284 3285 // Non-static data members. 3286 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3287 E = ClassDecl->field_end(); I != E; ++I) { 3288 FieldDecl *Field = *I; 3289 if (Field->isInvalidDecl()) 3290 continue; 3291 3292 // Don't destroy incomplete or zero-length arrays. 3293 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3294 continue; 3295 3296 QualType FieldType = Context.getBaseElementType(Field->getType()); 3297 3298 const RecordType* RT = FieldType->getAs<RecordType>(); 3299 if (!RT) 3300 continue; 3301 3302 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3303 if (FieldClassDecl->isInvalidDecl()) 3304 continue; 3305 if (FieldClassDecl->hasIrrelevantDestructor()) 3306 continue; 3307 // The destructor for an implicit anonymous union member is never invoked. 3308 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) 3309 continue; 3310 3311 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3312 assert(Dtor && "No dtor found for FieldClassDecl!"); 3313 CheckDestructorAccess(Field->getLocation(), Dtor, 3314 PDiag(diag::err_access_dtor_field) 3315 << Field->getDeclName() 3316 << FieldType); 3317 3318 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3319 DiagnoseUseOfDecl(Dtor, Location); 3320 } 3321 3322 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3323 3324 // Bases. 3325 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3326 E = ClassDecl->bases_end(); Base != E; ++Base) { 3327 // Bases are always records in a well-formed non-dependent class. 3328 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3329 3330 // Remember direct virtual bases. 3331 if (Base->isVirtual()) 3332 DirectVirtualBases.insert(RT); 3333 3334 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3335 // If our base class is invalid, we probably can't get its dtor anyway. 3336 if (BaseClassDecl->isInvalidDecl()) 3337 continue; 3338 if (BaseClassDecl->hasIrrelevantDestructor()) 3339 continue; 3340 3341 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3342 assert(Dtor && "No dtor found for BaseClassDecl!"); 3343 3344 // FIXME: caret should be on the start of the class name 3345 CheckDestructorAccess(Base->getLocStart(), Dtor, 3346 PDiag(diag::err_access_dtor_base) 3347 << Base->getType() 3348 << Base->getSourceRange(), 3349 Context.getTypeDeclType(ClassDecl)); 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()->castAs<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 Context.getTypeDeclType(ClassDecl)); 3379 3380 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3381 DiagnoseUseOfDecl(Dtor, Location); 3382 } 3383} 3384 3385void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3386 if (!CDtorDecl) 3387 return; 3388 3389 if (CXXConstructorDecl *Constructor 3390 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3391 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3392} 3393 3394bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3395 unsigned DiagID, AbstractDiagSelID SelID) { 3396 if (SelID == -1) 3397 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 3398 else 3399 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 3400} 3401 3402bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3403 const PartialDiagnostic &PD) { 3404 if (!getLangOpts().CPlusPlus) 3405 return false; 3406 3407 if (const ArrayType *AT = Context.getAsArrayType(T)) 3408 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3409 3410 if (const PointerType *PT = T->getAs<PointerType>()) { 3411 // Find the innermost pointer type. 3412 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3413 PT = T; 3414 3415 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3416 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3417 } 3418 3419 const RecordType *RT = T->getAs<RecordType>(); 3420 if (!RT) 3421 return false; 3422 3423 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3424 3425 // We can't answer whether something is abstract until it has a 3426 // definition. If it's currently being defined, we'll walk back 3427 // over all the declarations when we have a full definition. 3428 const CXXRecordDecl *Def = RD->getDefinition(); 3429 if (!Def || Def->isBeingDefined()) 3430 return false; 3431 3432 if (!RD->isAbstract()) 3433 return false; 3434 3435 Diag(Loc, PD) << RD->getDeclName(); 3436 DiagnoseAbstractType(RD); 3437 3438 return true; 3439} 3440 3441void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3442 // Check if we've already emitted the list of pure virtual functions 3443 // for this class. 3444 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3445 return; 3446 3447 CXXFinalOverriderMap FinalOverriders; 3448 RD->getFinalOverriders(FinalOverriders); 3449 3450 // Keep a set of seen pure methods so we won't diagnose the same method 3451 // more than once. 3452 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3453 3454 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3455 MEnd = FinalOverriders.end(); 3456 M != MEnd; 3457 ++M) { 3458 for (OverridingMethods::iterator SO = M->second.begin(), 3459 SOEnd = M->second.end(); 3460 SO != SOEnd; ++SO) { 3461 // C++ [class.abstract]p4: 3462 // A class is abstract if it contains or inherits at least one 3463 // pure virtual function for which the final overrider is pure 3464 // virtual. 3465 3466 // 3467 if (SO->second.size() != 1) 3468 continue; 3469 3470 if (!SO->second.front().Method->isPure()) 3471 continue; 3472 3473 if (!SeenPureMethods.insert(SO->second.front().Method)) 3474 continue; 3475 3476 Diag(SO->second.front().Method->getLocation(), 3477 diag::note_pure_virtual_function) 3478 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3479 } 3480 } 3481 3482 if (!PureVirtualClassDiagSet) 3483 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3484 PureVirtualClassDiagSet->insert(RD); 3485} 3486 3487namespace { 3488struct AbstractUsageInfo { 3489 Sema &S; 3490 CXXRecordDecl *Record; 3491 CanQualType AbstractType; 3492 bool Invalid; 3493 3494 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3495 : S(S), Record(Record), 3496 AbstractType(S.Context.getCanonicalType( 3497 S.Context.getTypeDeclType(Record))), 3498 Invalid(false) {} 3499 3500 void DiagnoseAbstractType() { 3501 if (Invalid) return; 3502 S.DiagnoseAbstractType(Record); 3503 Invalid = true; 3504 } 3505 3506 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3507}; 3508 3509struct CheckAbstractUsage { 3510 AbstractUsageInfo &Info; 3511 const NamedDecl *Ctx; 3512 3513 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3514 : Info(Info), Ctx(Ctx) {} 3515 3516 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3517 switch (TL.getTypeLocClass()) { 3518#define ABSTRACT_TYPELOC(CLASS, PARENT) 3519#define TYPELOC(CLASS, PARENT) \ 3520 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3521#include "clang/AST/TypeLocNodes.def" 3522 } 3523 } 3524 3525 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3526 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3527 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3528 if (!TL.getArg(I)) 3529 continue; 3530 3531 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3532 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3533 } 3534 } 3535 3536 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3537 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3538 } 3539 3540 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3541 // Visit the type parameters from a permissive context. 3542 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3543 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3544 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3545 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3546 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3547 // TODO: other template argument types? 3548 } 3549 } 3550 3551 // Visit pointee types from a permissive context. 3552#define CheckPolymorphic(Type) \ 3553 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3554 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3555 } 3556 CheckPolymorphic(PointerTypeLoc) 3557 CheckPolymorphic(ReferenceTypeLoc) 3558 CheckPolymorphic(MemberPointerTypeLoc) 3559 CheckPolymorphic(BlockPointerTypeLoc) 3560 CheckPolymorphic(AtomicTypeLoc) 3561 3562 /// Handle all the types we haven't given a more specific 3563 /// implementation for above. 3564 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3565 // Every other kind of type that we haven't called out already 3566 // that has an inner type is either (1) sugar or (2) contains that 3567 // inner type in some way as a subobject. 3568 if (TypeLoc Next = TL.getNextTypeLoc()) 3569 return Visit(Next, Sel); 3570 3571 // If there's no inner type and we're in a permissive context, 3572 // don't diagnose. 3573 if (Sel == Sema::AbstractNone) return; 3574 3575 // Check whether the type matches the abstract type. 3576 QualType T = TL.getType(); 3577 if (T->isArrayType()) { 3578 Sel = Sema::AbstractArrayType; 3579 T = Info.S.Context.getBaseElementType(T); 3580 } 3581 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3582 if (CT != Info.AbstractType) return; 3583 3584 // It matched; do some magic. 3585 if (Sel == Sema::AbstractArrayType) { 3586 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3587 << T << TL.getSourceRange(); 3588 } else { 3589 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3590 << Sel << T << TL.getSourceRange(); 3591 } 3592 Info.DiagnoseAbstractType(); 3593 } 3594}; 3595 3596void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3597 Sema::AbstractDiagSelID Sel) { 3598 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3599} 3600 3601} 3602 3603/// Check for invalid uses of an abstract type in a method declaration. 3604static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3605 CXXMethodDecl *MD) { 3606 // No need to do the check on definitions, which require that 3607 // the return/param types be complete. 3608 if (MD->doesThisDeclarationHaveABody()) 3609 return; 3610 3611 // For safety's sake, just ignore it if we don't have type source 3612 // information. This should never happen for non-implicit methods, 3613 // but... 3614 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3615 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3616} 3617 3618/// Check for invalid uses of an abstract type within a class definition. 3619static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3620 CXXRecordDecl *RD) { 3621 for (CXXRecordDecl::decl_iterator 3622 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3623 Decl *D = *I; 3624 if (D->isImplicit()) continue; 3625 3626 // Methods and method templates. 3627 if (isa<CXXMethodDecl>(D)) { 3628 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3629 } else if (isa<FunctionTemplateDecl>(D)) { 3630 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3631 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3632 3633 // Fields and static variables. 3634 } else if (isa<FieldDecl>(D)) { 3635 FieldDecl *FD = cast<FieldDecl>(D); 3636 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3637 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3638 } else if (isa<VarDecl>(D)) { 3639 VarDecl *VD = cast<VarDecl>(D); 3640 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3641 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3642 3643 // Nested classes and class templates. 3644 } else if (isa<CXXRecordDecl>(D)) { 3645 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3646 } else if (isa<ClassTemplateDecl>(D)) { 3647 CheckAbstractClassUsage(Info, 3648 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3649 } 3650 } 3651} 3652 3653/// \brief Perform semantic checks on a class definition that has been 3654/// completing, introducing implicitly-declared members, checking for 3655/// abstract types, etc. 3656void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3657 if (!Record) 3658 return; 3659 3660 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3661 AbstractUsageInfo Info(*this, Record); 3662 CheckAbstractClassUsage(Info, Record); 3663 } 3664 3665 // If this is not an aggregate type and has no user-declared constructor, 3666 // complain about any non-static data members of reference or const scalar 3667 // type, since they will never get initializers. 3668 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3669 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 3670 !Record->isLambda()) { 3671 bool Complained = false; 3672 for (RecordDecl::field_iterator F = Record->field_begin(), 3673 FEnd = Record->field_end(); 3674 F != FEnd; ++F) { 3675 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3676 continue; 3677 3678 if (F->getType()->isReferenceType() || 3679 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3680 if (!Complained) { 3681 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3682 << Record->getTagKind() << Record; 3683 Complained = true; 3684 } 3685 3686 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3687 << F->getType()->isReferenceType() 3688 << F->getDeclName(); 3689 } 3690 } 3691 } 3692 3693 if (Record->isDynamicClass() && !Record->isDependentType()) 3694 DynamicClasses.push_back(Record); 3695 3696 if (Record->getIdentifier()) { 3697 // C++ [class.mem]p13: 3698 // If T is the name of a class, then each of the following shall have a 3699 // name different from T: 3700 // - every member of every anonymous union that is a member of class T. 3701 // 3702 // C++ [class.mem]p14: 3703 // In addition, if class T has a user-declared constructor (12.1), every 3704 // non-static data member of class T shall have a name different from T. 3705 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3706 R.first != R.second; ++R.first) { 3707 NamedDecl *D = *R.first; 3708 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3709 isa<IndirectFieldDecl>(D)) { 3710 Diag(D->getLocation(), diag::err_member_name_of_class) 3711 << D->getDeclName(); 3712 break; 3713 } 3714 } 3715 } 3716 3717 // Warn if the class has virtual methods but non-virtual public destructor. 3718 if (Record->isPolymorphic() && !Record->isDependentType()) { 3719 CXXDestructorDecl *dtor = Record->getDestructor(); 3720 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3721 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3722 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3723 } 3724 3725 // See if a method overloads virtual methods in a base 3726 /// class without overriding any. 3727 if (!Record->isDependentType()) { 3728 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3729 MEnd = Record->method_end(); 3730 M != MEnd; ++M) { 3731 if (!(*M)->isStatic()) 3732 DiagnoseHiddenVirtualMethods(Record, *M); 3733 } 3734 } 3735 3736 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3737 // function that is not a constructor declares that member function to be 3738 // const. [...] The class of which that function is a member shall be 3739 // a literal type. 3740 // 3741 // If the class has virtual bases, any constexpr members will already have 3742 // been diagnosed by the checks performed on the member declaration, so 3743 // suppress this (less useful) diagnostic. 3744 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3745 !Record->isLiteral() && !Record->getNumVBases()) { 3746 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3747 MEnd = Record->method_end(); 3748 M != MEnd; ++M) { 3749 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 3750 switch (Record->getTemplateSpecializationKind()) { 3751 case TSK_ImplicitInstantiation: 3752 case TSK_ExplicitInstantiationDeclaration: 3753 case TSK_ExplicitInstantiationDefinition: 3754 // If a template instantiates to a non-literal type, but its members 3755 // instantiate to constexpr functions, the template is technically 3756 // ill-formed, but we allow it for sanity. 3757 continue; 3758 3759 case TSK_Undeclared: 3760 case TSK_ExplicitSpecialization: 3761 RequireLiteralType((*M)->getLocation(), Context.getRecordType(Record), 3762 PDiag(diag::err_constexpr_method_non_literal)); 3763 break; 3764 } 3765 3766 // Only produce one error per class. 3767 break; 3768 } 3769 } 3770 } 3771 3772 // Declare inherited constructors. We do this eagerly here because: 3773 // - The standard requires an eager diagnostic for conflicting inherited 3774 // constructors from different classes. 3775 // - The lazy declaration of the other implicit constructors is so as to not 3776 // waste space and performance on classes that are not meant to be 3777 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3778 // have inherited constructors. 3779 DeclareInheritedConstructors(Record); 3780 3781 if (!Record->isDependentType()) 3782 CheckExplicitlyDefaultedMethods(Record); 3783} 3784 3785void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3786 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3787 ME = Record->method_end(); 3788 MI != ME; ++MI) { 3789 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3790 switch (getSpecialMember(*MI)) { 3791 case CXXDefaultConstructor: 3792 CheckExplicitlyDefaultedDefaultConstructor( 3793 cast<CXXConstructorDecl>(*MI)); 3794 break; 3795 3796 case CXXDestructor: 3797 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3798 break; 3799 3800 case CXXCopyConstructor: 3801 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3802 break; 3803 3804 case CXXCopyAssignment: 3805 CheckExplicitlyDefaultedCopyAssignment(*MI); 3806 break; 3807 3808 case CXXMoveConstructor: 3809 CheckExplicitlyDefaultedMoveConstructor(cast<CXXConstructorDecl>(*MI)); 3810 break; 3811 3812 case CXXMoveAssignment: 3813 CheckExplicitlyDefaultedMoveAssignment(*MI); 3814 break; 3815 3816 case CXXInvalid: 3817 llvm_unreachable("non-special member explicitly defaulted!"); 3818 } 3819 } 3820 } 3821 3822} 3823 3824void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3825 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3826 3827 // Whether this was the first-declared instance of the constructor. 3828 // This affects whether we implicitly add an exception spec (and, eventually, 3829 // constexpr). It is also ill-formed to explicitly default a constructor such 3830 // that it would be deleted. (C++0x [decl.fct.def.default]) 3831 bool First = CD == CD->getCanonicalDecl(); 3832 3833 bool HadError = false; 3834 if (CD->getNumParams() != 0) { 3835 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3836 << CD->getSourceRange(); 3837 HadError = true; 3838 } 3839 3840 ImplicitExceptionSpecification Spec 3841 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3842 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3843 if (EPI.ExceptionSpecType == EST_Delayed) { 3844 // Exception specification depends on some deferred part of the class. We'll 3845 // try again when the class's definition has been fully processed. 3846 return; 3847 } 3848 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3849 *ExceptionType = Context.getFunctionType( 3850 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3851 3852 // C++11 [dcl.fct.def.default]p2: 3853 // An explicitly-defaulted function may be declared constexpr only if it 3854 // would have been implicitly declared as constexpr, 3855 // Do not apply this rule to templates, since core issue 1358 makes such 3856 // functions always instantiate to constexpr functions. 3857 if (CD->isConstexpr() && 3858 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 3859 if (!CD->getParent()->defaultedDefaultConstructorIsConstexpr()) { 3860 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3861 << CXXDefaultConstructor; 3862 HadError = true; 3863 } 3864 } 3865 // and may have an explicit exception-specification only if it is compatible 3866 // with the exception-specification on the implicit declaration. 3867 if (CtorType->hasExceptionSpec()) { 3868 if (CheckEquivalentExceptionSpec( 3869 PDiag(diag::err_incorrect_defaulted_exception_spec) 3870 << CXXDefaultConstructor, 3871 PDiag(), 3872 ExceptionType, SourceLocation(), 3873 CtorType, CD->getLocation())) { 3874 HadError = true; 3875 } 3876 } 3877 3878 // If a function is explicitly defaulted on its first declaration, 3879 if (First) { 3880 // -- it is implicitly considered to be constexpr if the implicit 3881 // definition would be, 3882 CD->setConstexpr(CD->getParent()->defaultedDefaultConstructorIsConstexpr()); 3883 3884 // -- it is implicitly considered to have the same 3885 // exception-specification as if it had been implicitly declared 3886 // 3887 // FIXME: a compatible, but different, explicit exception specification 3888 // will be silently overridden. We should issue a warning if this happens. 3889 EPI.ExtInfo = CtorType->getExtInfo(); 3890 3891 // Such a function is also trivial if the implicitly-declared function 3892 // would have been. 3893 CD->setTrivial(CD->getParent()->hasTrivialDefaultConstructor()); 3894 } 3895 3896 if (HadError) { 3897 CD->setInvalidDecl(); 3898 return; 3899 } 3900 3901 if (ShouldDeleteSpecialMember(CD, CXXDefaultConstructor)) { 3902 if (First) { 3903 CD->setDeletedAsWritten(); 3904 } else { 3905 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3906 << CXXDefaultConstructor; 3907 CD->setInvalidDecl(); 3908 } 3909 } 3910} 3911 3912void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3913 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3914 3915 // Whether this was the first-declared instance of the constructor. 3916 bool First = CD == CD->getCanonicalDecl(); 3917 3918 bool HadError = false; 3919 if (CD->getNumParams() != 1) { 3920 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3921 << CD->getSourceRange(); 3922 HadError = true; 3923 } 3924 3925 ImplicitExceptionSpecification Spec(Context); 3926 bool Const; 3927 llvm::tie(Spec, Const) = 3928 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3929 3930 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3931 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3932 *ExceptionType = Context.getFunctionType( 3933 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3934 3935 // Check for parameter type matching. 3936 // This is a copy ctor so we know it's a cv-qualified reference to T. 3937 QualType ArgType = CtorType->getArgType(0); 3938 if (ArgType->getPointeeType().isVolatileQualified()) { 3939 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3940 HadError = true; 3941 } 3942 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3943 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3944 HadError = true; 3945 } 3946 3947 // C++11 [dcl.fct.def.default]p2: 3948 // An explicitly-defaulted function may be declared constexpr only if it 3949 // would have been implicitly declared as constexpr, 3950 // Do not apply this rule to templates, since core issue 1358 makes such 3951 // functions always instantiate to constexpr functions. 3952 if (CD->isConstexpr() && 3953 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 3954 if (!CD->getParent()->defaultedCopyConstructorIsConstexpr()) { 3955 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3956 << CXXCopyConstructor; 3957 HadError = true; 3958 } 3959 } 3960 // and may have an explicit exception-specification only if it is compatible 3961 // with the exception-specification on the implicit declaration. 3962 if (CtorType->hasExceptionSpec()) { 3963 if (CheckEquivalentExceptionSpec( 3964 PDiag(diag::err_incorrect_defaulted_exception_spec) 3965 << CXXCopyConstructor, 3966 PDiag(), 3967 ExceptionType, SourceLocation(), 3968 CtorType, CD->getLocation())) { 3969 HadError = true; 3970 } 3971 } 3972 3973 // If a function is explicitly defaulted on its first declaration, 3974 if (First) { 3975 // -- it is implicitly considered to be constexpr if the implicit 3976 // definition would be, 3977 CD->setConstexpr(CD->getParent()->defaultedCopyConstructorIsConstexpr()); 3978 3979 // -- it is implicitly considered to have the same 3980 // exception-specification as if it had been implicitly declared, and 3981 // 3982 // FIXME: a compatible, but different, explicit exception specification 3983 // will be silently overridden. We should issue a warning if this happens. 3984 EPI.ExtInfo = CtorType->getExtInfo(); 3985 3986 // -- [...] it shall have the same parameter type as if it had been 3987 // implicitly declared. 3988 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3989 3990 // Such a function is also trivial if the implicitly-declared function 3991 // would have been. 3992 CD->setTrivial(CD->getParent()->hasTrivialCopyConstructor()); 3993 } 3994 3995 if (HadError) { 3996 CD->setInvalidDecl(); 3997 return; 3998 } 3999 4000 if (ShouldDeleteSpecialMember(CD, CXXCopyConstructor)) { 4001 if (First) { 4002 CD->setDeletedAsWritten(); 4003 } else { 4004 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 4005 << CXXCopyConstructor; 4006 CD->setInvalidDecl(); 4007 } 4008 } 4009} 4010 4011void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 4012 assert(MD->isExplicitlyDefaulted()); 4013 4014 // Whether this was the first-declared instance of the operator 4015 bool First = MD == MD->getCanonicalDecl(); 4016 4017 bool HadError = false; 4018 if (MD->getNumParams() != 1) { 4019 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 4020 << MD->getSourceRange(); 4021 HadError = true; 4022 } 4023 4024 QualType ReturnType = 4025 MD->getType()->getAs<FunctionType>()->getResultType(); 4026 if (!ReturnType->isLValueReferenceType() || 4027 !Context.hasSameType( 4028 Context.getCanonicalType(ReturnType->getPointeeType()), 4029 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 4030 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 4031 HadError = true; 4032 } 4033 4034 ImplicitExceptionSpecification Spec(Context); 4035 bool Const; 4036 llvm::tie(Spec, Const) = 4037 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 4038 4039 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4040 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4041 *ExceptionType = Context.getFunctionType( 4042 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4043 4044 QualType ArgType = OperType->getArgType(0); 4045 if (!ArgType->isLValueReferenceType()) { 4046 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4047 HadError = true; 4048 } else { 4049 if (ArgType->getPointeeType().isVolatileQualified()) { 4050 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 4051 HadError = true; 4052 } 4053 if (ArgType->getPointeeType().isConstQualified() && !Const) { 4054 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 4055 HadError = true; 4056 } 4057 } 4058 4059 if (OperType->getTypeQuals()) { 4060 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 4061 HadError = true; 4062 } 4063 4064 if (OperType->hasExceptionSpec()) { 4065 if (CheckEquivalentExceptionSpec( 4066 PDiag(diag::err_incorrect_defaulted_exception_spec) 4067 << CXXCopyAssignment, 4068 PDiag(), 4069 ExceptionType, SourceLocation(), 4070 OperType, MD->getLocation())) { 4071 HadError = true; 4072 } 4073 } 4074 if (First) { 4075 // We set the declaration to have the computed exception spec here. 4076 // We duplicate the one parameter type. 4077 EPI.RefQualifier = OperType->getRefQualifier(); 4078 EPI.ExtInfo = OperType->getExtInfo(); 4079 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4080 4081 // Such a function is also trivial if the implicitly-declared function 4082 // would have been. 4083 MD->setTrivial(MD->getParent()->hasTrivialCopyAssignment()); 4084 } 4085 4086 if (HadError) { 4087 MD->setInvalidDecl(); 4088 return; 4089 } 4090 4091 if (ShouldDeleteSpecialMember(MD, CXXCopyAssignment)) { 4092 if (First) { 4093 MD->setDeletedAsWritten(); 4094 } else { 4095 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4096 << CXXCopyAssignment; 4097 MD->setInvalidDecl(); 4098 } 4099 } 4100} 4101 4102void Sema::CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *CD) { 4103 assert(CD->isExplicitlyDefaulted() && CD->isMoveConstructor()); 4104 4105 // Whether this was the first-declared instance of the constructor. 4106 bool First = CD == CD->getCanonicalDecl(); 4107 4108 bool HadError = false; 4109 if (CD->getNumParams() != 1) { 4110 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_params) 4111 << CD->getSourceRange(); 4112 HadError = true; 4113 } 4114 4115 ImplicitExceptionSpecification Spec( 4116 ComputeDefaultedMoveCtorExceptionSpec(CD->getParent())); 4117 4118 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4119 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 4120 *ExceptionType = Context.getFunctionType( 4121 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4122 4123 // Check for parameter type matching. 4124 // This is a move ctor so we know it's a cv-qualified rvalue reference to T. 4125 QualType ArgType = CtorType->getArgType(0); 4126 if (ArgType->getPointeeType().isVolatileQualified()) { 4127 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_volatile_param); 4128 HadError = true; 4129 } 4130 if (ArgType->getPointeeType().isConstQualified()) { 4131 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_const_param); 4132 HadError = true; 4133 } 4134 4135 // C++11 [dcl.fct.def.default]p2: 4136 // An explicitly-defaulted function may be declared constexpr only if it 4137 // would have been implicitly declared as constexpr, 4138 // Do not apply this rule to templates, since core issue 1358 makes such 4139 // functions always instantiate to constexpr functions. 4140 if (CD->isConstexpr() && 4141 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4142 if (!CD->getParent()->defaultedMoveConstructorIsConstexpr()) { 4143 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 4144 << CXXMoveConstructor; 4145 HadError = true; 4146 } 4147 } 4148 // and may have an explicit exception-specification only if it is compatible 4149 // with the exception-specification on the implicit declaration. 4150 if (CtorType->hasExceptionSpec()) { 4151 if (CheckEquivalentExceptionSpec( 4152 PDiag(diag::err_incorrect_defaulted_exception_spec) 4153 << CXXMoveConstructor, 4154 PDiag(), 4155 ExceptionType, SourceLocation(), 4156 CtorType, CD->getLocation())) { 4157 HadError = true; 4158 } 4159 } 4160 4161 // If a function is explicitly defaulted on its first declaration, 4162 if (First) { 4163 // -- it is implicitly considered to be constexpr if the implicit 4164 // definition would be, 4165 CD->setConstexpr(CD->getParent()->defaultedMoveConstructorIsConstexpr()); 4166 4167 // -- it is implicitly considered to have the same 4168 // exception-specification as if it had been implicitly declared, and 4169 // 4170 // FIXME: a compatible, but different, explicit exception specification 4171 // will be silently overridden. We should issue a warning if this happens. 4172 EPI.ExtInfo = CtorType->getExtInfo(); 4173 4174 // -- [...] it shall have the same parameter type as if it had been 4175 // implicitly declared. 4176 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 4177 4178 // Such a function is also trivial if the implicitly-declared function 4179 // would have been. 4180 CD->setTrivial(CD->getParent()->hasTrivialMoveConstructor()); 4181 } 4182 4183 if (HadError) { 4184 CD->setInvalidDecl(); 4185 return; 4186 } 4187 4188 if (ShouldDeleteSpecialMember(CD, CXXMoveConstructor)) { 4189 if (First) { 4190 CD->setDeletedAsWritten(); 4191 } else { 4192 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 4193 << CXXMoveConstructor; 4194 CD->setInvalidDecl(); 4195 } 4196 } 4197} 4198 4199void Sema::CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *MD) { 4200 assert(MD->isExplicitlyDefaulted()); 4201 4202 // Whether this was the first-declared instance of the operator 4203 bool First = MD == MD->getCanonicalDecl(); 4204 4205 bool HadError = false; 4206 if (MD->getNumParams() != 1) { 4207 Diag(MD->getLocation(), diag::err_defaulted_move_assign_params) 4208 << MD->getSourceRange(); 4209 HadError = true; 4210 } 4211 4212 QualType ReturnType = 4213 MD->getType()->getAs<FunctionType>()->getResultType(); 4214 if (!ReturnType->isLValueReferenceType() || 4215 !Context.hasSameType( 4216 Context.getCanonicalType(ReturnType->getPointeeType()), 4217 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 4218 Diag(MD->getLocation(), diag::err_defaulted_move_assign_return_type); 4219 HadError = true; 4220 } 4221 4222 ImplicitExceptionSpecification Spec( 4223 ComputeDefaultedMoveCtorExceptionSpec(MD->getParent())); 4224 4225 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4226 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4227 *ExceptionType = Context.getFunctionType( 4228 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4229 4230 QualType ArgType = OperType->getArgType(0); 4231 if (!ArgType->isRValueReferenceType()) { 4232 Diag(MD->getLocation(), diag::err_defaulted_move_assign_not_ref); 4233 HadError = true; 4234 } else { 4235 if (ArgType->getPointeeType().isVolatileQualified()) { 4236 Diag(MD->getLocation(), diag::err_defaulted_move_assign_volatile_param); 4237 HadError = true; 4238 } 4239 if (ArgType->getPointeeType().isConstQualified()) { 4240 Diag(MD->getLocation(), diag::err_defaulted_move_assign_const_param); 4241 HadError = true; 4242 } 4243 } 4244 4245 if (OperType->getTypeQuals()) { 4246 Diag(MD->getLocation(), diag::err_defaulted_move_assign_quals); 4247 HadError = true; 4248 } 4249 4250 if (OperType->hasExceptionSpec()) { 4251 if (CheckEquivalentExceptionSpec( 4252 PDiag(diag::err_incorrect_defaulted_exception_spec) 4253 << CXXMoveAssignment, 4254 PDiag(), 4255 ExceptionType, SourceLocation(), 4256 OperType, MD->getLocation())) { 4257 HadError = true; 4258 } 4259 } 4260 if (First) { 4261 // We set the declaration to have the computed exception spec here. 4262 // We duplicate the one parameter type. 4263 EPI.RefQualifier = OperType->getRefQualifier(); 4264 EPI.ExtInfo = OperType->getExtInfo(); 4265 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4266 4267 // Such a function is also trivial if the implicitly-declared function 4268 // would have been. 4269 MD->setTrivial(MD->getParent()->hasTrivialMoveAssignment()); 4270 } 4271 4272 if (HadError) { 4273 MD->setInvalidDecl(); 4274 return; 4275 } 4276 4277 if (ShouldDeleteSpecialMember(MD, CXXMoveAssignment)) { 4278 if (First) { 4279 MD->setDeletedAsWritten(); 4280 } else { 4281 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4282 << CXXMoveAssignment; 4283 MD->setInvalidDecl(); 4284 } 4285 } 4286} 4287 4288void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 4289 assert(DD->isExplicitlyDefaulted()); 4290 4291 // Whether this was the first-declared instance of the destructor. 4292 bool First = DD == DD->getCanonicalDecl(); 4293 4294 ImplicitExceptionSpecification Spec 4295 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 4296 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4297 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 4298 *ExceptionType = Context.getFunctionType( 4299 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4300 4301 if (DtorType->hasExceptionSpec()) { 4302 if (CheckEquivalentExceptionSpec( 4303 PDiag(diag::err_incorrect_defaulted_exception_spec) 4304 << CXXDestructor, 4305 PDiag(), 4306 ExceptionType, SourceLocation(), 4307 DtorType, DD->getLocation())) { 4308 DD->setInvalidDecl(); 4309 return; 4310 } 4311 } 4312 if (First) { 4313 // We set the declaration to have the computed exception spec here. 4314 // There are no parameters. 4315 EPI.ExtInfo = DtorType->getExtInfo(); 4316 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 4317 4318 // Such a function is also trivial if the implicitly-declared function 4319 // would have been. 4320 DD->setTrivial(DD->getParent()->hasTrivialDestructor()); 4321 } 4322 4323 if (ShouldDeleteSpecialMember(DD, CXXDestructor)) { 4324 if (First) { 4325 DD->setDeletedAsWritten(); 4326 } else { 4327 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 4328 << CXXDestructor; 4329 DD->setInvalidDecl(); 4330 } 4331 } 4332} 4333 4334namespace { 4335struct SpecialMemberDeletionInfo { 4336 Sema &S; 4337 CXXMethodDecl *MD; 4338 Sema::CXXSpecialMember CSM; 4339 bool Diagnose; 4340 4341 // Properties of the special member, computed for convenience. 4342 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4343 SourceLocation Loc; 4344 4345 bool AllFieldsAreConst; 4346 4347 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4348 Sema::CXXSpecialMember CSM, bool Diagnose) 4349 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose), 4350 IsConstructor(false), IsAssignment(false), IsMove(false), 4351 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4352 AllFieldsAreConst(true) { 4353 switch (CSM) { 4354 case Sema::CXXDefaultConstructor: 4355 case Sema::CXXCopyConstructor: 4356 IsConstructor = true; 4357 break; 4358 case Sema::CXXMoveConstructor: 4359 IsConstructor = true; 4360 IsMove = true; 4361 break; 4362 case Sema::CXXCopyAssignment: 4363 IsAssignment = true; 4364 break; 4365 case Sema::CXXMoveAssignment: 4366 IsAssignment = true; 4367 IsMove = true; 4368 break; 4369 case Sema::CXXDestructor: 4370 break; 4371 case Sema::CXXInvalid: 4372 llvm_unreachable("invalid special member kind"); 4373 } 4374 4375 if (MD->getNumParams()) { 4376 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4377 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4378 } 4379 } 4380 4381 bool inUnion() const { return MD->getParent()->isUnion(); } 4382 4383 /// Look up the corresponding special member in the given class. 4384 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class) { 4385 unsigned TQ = MD->getTypeQualifiers(); 4386 return S.LookupSpecialMember(Class, CSM, ConstArg, VolatileArg, 4387 MD->getRefQualifier() == RQ_RValue, 4388 TQ & Qualifiers::Const, 4389 TQ & Qualifiers::Volatile); 4390 } 4391 4392 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; 4393 4394 bool shouldDeleteForBase(CXXBaseSpecifier *Base); 4395 bool shouldDeleteForField(FieldDecl *FD); 4396 bool shouldDeleteForAllConstMembers(); 4397 4398 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj); 4399 bool shouldDeleteForSubobjectCall(Subobject Subobj, 4400 Sema::SpecialMemberOverloadResult *SMOR, 4401 bool IsDtorCallInCtor); 4402 4403 bool isAccessible(Subobject Subobj, CXXMethodDecl *D); 4404}; 4405} 4406 4407/// Is the given special member inaccessible when used on the given 4408/// sub-object. 4409bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, 4410 CXXMethodDecl *target) { 4411 /// If we're operating on a base class, the object type is the 4412 /// type of this special member. 4413 QualType objectTy; 4414 AccessSpecifier access = target->getAccess();; 4415 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { 4416 objectTy = S.Context.getTypeDeclType(MD->getParent()); 4417 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); 4418 4419 // If we're operating on a field, the object type is the type of the field. 4420 } else { 4421 objectTy = S.Context.getTypeDeclType(target->getParent()); 4422 } 4423 4424 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy); 4425} 4426 4427/// Check whether we should delete a special member due to the implicit 4428/// definition containing a call to a special member of a subobject. 4429bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( 4430 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR, 4431 bool IsDtorCallInCtor) { 4432 CXXMethodDecl *Decl = SMOR->getMethod(); 4433 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4434 4435 int DiagKind = -1; 4436 4437 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) 4438 DiagKind = !Decl ? 0 : 1; 4439 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4440 DiagKind = 2; 4441 else if (!isAccessible(Subobj, Decl)) 4442 DiagKind = 3; 4443 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && 4444 !Decl->isTrivial()) { 4445 // A member of a union must have a trivial corresponding special member. 4446 // As a weird special case, a destructor call from a union's constructor 4447 // must be accessible and non-deleted, but need not be trivial. Such a 4448 // destructor is never actually called, but is semantically checked as 4449 // if it were. 4450 DiagKind = 4; 4451 } 4452 4453 if (DiagKind == -1) 4454 return false; 4455 4456 if (Diagnose) { 4457 if (Field) { 4458 S.Diag(Field->getLocation(), 4459 diag::note_deleted_special_member_class_subobject) 4460 << CSM << MD->getParent() << /*IsField*/true 4461 << Field << DiagKind << IsDtorCallInCtor; 4462 } else { 4463 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); 4464 S.Diag(Base->getLocStart(), 4465 diag::note_deleted_special_member_class_subobject) 4466 << CSM << MD->getParent() << /*IsField*/false 4467 << Base->getType() << DiagKind << IsDtorCallInCtor; 4468 } 4469 4470 if (DiagKind == 1) 4471 S.NoteDeletedFunction(Decl); 4472 // FIXME: Explain inaccessibility if DiagKind == 3. 4473 } 4474 4475 return true; 4476} 4477 4478/// Check whether we should delete a special member function due to having a 4479/// direct or virtual base class or static data member of class type M. 4480bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 4481 CXXRecordDecl *Class, Subobject Subobj) { 4482 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4483 4484 // C++11 [class.ctor]p5: 4485 // -- any direct or virtual base class, or non-static data member with no 4486 // brace-or-equal-initializer, has class type M (or array thereof) and 4487 // either M has no default constructor or overload resolution as applied 4488 // to M's default constructor results in an ambiguity or in a function 4489 // that is deleted or inaccessible 4490 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4491 // -- a direct or virtual base class B that cannot be copied/moved because 4492 // overload resolution, as applied to B's corresponding special member, 4493 // results in an ambiguity or a function that is deleted or inaccessible 4494 // from the defaulted special member 4495 // C++11 [class.dtor]p5: 4496 // -- any direct or virtual base class [...] has a type with a destructor 4497 // that is deleted or inaccessible 4498 if (!(CSM == Sema::CXXDefaultConstructor && 4499 Field && Field->hasInClassInitializer()) && 4500 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class), false)) 4501 return true; 4502 4503 // C++11 [class.ctor]p5, C++11 [class.copy]p11: 4504 // -- any direct or virtual base class or non-static data member has a 4505 // type with a destructor that is deleted or inaccessible 4506 if (IsConstructor) { 4507 Sema::SpecialMemberOverloadResult *SMOR = 4508 S.LookupSpecialMember(Class, Sema::CXXDestructor, 4509 false, false, false, false, false); 4510 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) 4511 return true; 4512 } 4513 4514 return false; 4515} 4516 4517/// Check whether we should delete a special member function due to the class 4518/// having a particular direct or virtual base class. 4519bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { 4520 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); 4521 return shouldDeleteForClassSubobject(BaseClass, Base); 4522} 4523 4524/// Check whether we should delete a special member function due to the class 4525/// having a particular non-static data member. 4526bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4527 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4528 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4529 4530 if (CSM == Sema::CXXDefaultConstructor) { 4531 // For a default constructor, all references must be initialized in-class 4532 // and, if a union, it must have a non-const member. 4533 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { 4534 if (Diagnose) 4535 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4536 << MD->getParent() << FD << FieldType << /*Reference*/0; 4537 return true; 4538 } 4539 // C++11 [class.ctor]p5: any non-variant non-static data member of 4540 // const-qualified type (or array thereof) with no 4541 // brace-or-equal-initializer does not have a user-provided default 4542 // constructor. 4543 if (!inUnion() && FieldType.isConstQualified() && 4544 !FD->hasInClassInitializer() && 4545 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { 4546 if (Diagnose) 4547 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4548 << MD->getParent() << FD << FieldType << /*Const*/1; 4549 return true; 4550 } 4551 4552 if (inUnion() && !FieldType.isConstQualified()) 4553 AllFieldsAreConst = false; 4554 } else if (CSM == Sema::CXXCopyConstructor) { 4555 // For a copy constructor, data members must not be of rvalue reference 4556 // type. 4557 if (FieldType->isRValueReferenceType()) { 4558 if (Diagnose) 4559 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) 4560 << MD->getParent() << FD << FieldType; 4561 return true; 4562 } 4563 } else if (IsAssignment) { 4564 // For an assignment operator, data members must not be of reference type. 4565 if (FieldType->isReferenceType()) { 4566 if (Diagnose) 4567 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4568 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0; 4569 return true; 4570 } 4571 if (!FieldRecord && FieldType.isConstQualified()) { 4572 // C++11 [class.copy]p23: 4573 // -- a non-static data member of const non-class type (or array thereof) 4574 if (Diagnose) 4575 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4576 << IsMove << MD->getParent() << FD << FieldType << /*Const*/1; 4577 return true; 4578 } 4579 } 4580 4581 if (FieldRecord) { 4582 // Some additional restrictions exist on the variant members. 4583 if (!inUnion() && FieldRecord->isUnion() && 4584 FieldRecord->isAnonymousStructOrUnion()) { 4585 bool AllVariantFieldsAreConst = true; 4586 4587 // FIXME: Handle anonymous unions declared within anonymous unions. 4588 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4589 UE = FieldRecord->field_end(); 4590 UI != UE; ++UI) { 4591 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4592 4593 if (!UnionFieldType.isConstQualified()) 4594 AllVariantFieldsAreConst = false; 4595 4596 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 4597 if (UnionFieldRecord && 4598 shouldDeleteForClassSubobject(UnionFieldRecord, *UI)) 4599 return true; 4600 } 4601 4602 // At least one member in each anonymous union must be non-const 4603 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 4604 FieldRecord->field_begin() != FieldRecord->field_end()) { 4605 if (Diagnose) 4606 S.Diag(FieldRecord->getLocation(), 4607 diag::note_deleted_default_ctor_all_const) 4608 << MD->getParent() << /*anonymous union*/1; 4609 return true; 4610 } 4611 4612 // Don't check the implicit member of the anonymous union type. 4613 // This is technically non-conformant, but sanity demands it. 4614 return false; 4615 } 4616 4617 if (shouldDeleteForClassSubobject(FieldRecord, FD)) 4618 return true; 4619 } 4620 4621 return false; 4622} 4623 4624/// C++11 [class.ctor] p5: 4625/// A defaulted default constructor for a class X is defined as deleted if 4626/// X is a union and all of its variant members are of const-qualified type. 4627bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4628 // This is a silly definition, because it gives an empty union a deleted 4629 // default constructor. Don't do that. 4630 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 4631 (MD->getParent()->field_begin() != MD->getParent()->field_end())) { 4632 if (Diagnose) 4633 S.Diag(MD->getParent()->getLocation(), 4634 diag::note_deleted_default_ctor_all_const) 4635 << MD->getParent() << /*not anonymous union*/0; 4636 return true; 4637 } 4638 return false; 4639} 4640 4641/// Determine whether a defaulted special member function should be defined as 4642/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4643/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4644bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, 4645 bool Diagnose) { 4646 assert(!MD->isInvalidDecl()); 4647 CXXRecordDecl *RD = MD->getParent(); 4648 assert(!RD->isDependentType() && "do deletion after instantiation"); 4649 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4650 return false; 4651 4652 // C++11 [expr.lambda.prim]p19: 4653 // The closure type associated with a lambda-expression has a 4654 // deleted (8.4.3) default constructor and a deleted copy 4655 // assignment operator. 4656 if (RD->isLambda() && 4657 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { 4658 if (Diagnose) 4659 Diag(RD->getLocation(), diag::note_lambda_decl); 4660 return true; 4661 } 4662 4663 // For an anonymous struct or union, the copy and assignment special members 4664 // will never be used, so skip the check. For an anonymous union declared at 4665 // namespace scope, the constructor and destructor are used. 4666 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4667 RD->isAnonymousStructOrUnion()) 4668 return false; 4669 4670 // C++11 [class.copy]p7, p18: 4671 // If the class definition declares a move constructor or move assignment 4672 // operator, an implicitly declared copy constructor or copy assignment 4673 // operator is defined as deleted. 4674 if (MD->isImplicit() && 4675 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { 4676 CXXMethodDecl *UserDeclaredMove = 0; 4677 4678 // In Microsoft mode, a user-declared move only causes the deletion of the 4679 // corresponding copy operation, not both copy operations. 4680 if (RD->hasUserDeclaredMoveConstructor() && 4681 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) { 4682 if (!Diagnose) return true; 4683 UserDeclaredMove = RD->getMoveConstructor(); 4684 assert(UserDeclaredMove); 4685 } else if (RD->hasUserDeclaredMoveAssignment() && 4686 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) { 4687 if (!Diagnose) return true; 4688 UserDeclaredMove = RD->getMoveAssignmentOperator(); 4689 assert(UserDeclaredMove); 4690 } 4691 4692 if (UserDeclaredMove) { 4693 Diag(UserDeclaredMove->getLocation(), 4694 diag::note_deleted_copy_user_declared_move) 4695 << (CSM == CXXCopyAssignment) << RD 4696 << UserDeclaredMove->isMoveAssignmentOperator(); 4697 return true; 4698 } 4699 } 4700 4701 // Do access control from the special member function 4702 ContextRAII MethodContext(*this, MD); 4703 4704 // C++11 [class.dtor]p5: 4705 // -- for a virtual destructor, lookup of the non-array deallocation function 4706 // results in an ambiguity or in a function that is deleted or inaccessible 4707 if (CSM == CXXDestructor && MD->isVirtual()) { 4708 FunctionDecl *OperatorDelete = 0; 4709 DeclarationName Name = 4710 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4711 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 4712 OperatorDelete, false)) { 4713 if (Diagnose) 4714 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); 4715 return true; 4716 } 4717 } 4718 4719 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose); 4720 4721 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4722 BE = RD->bases_end(); BI != BE; ++BI) 4723 if (!BI->isVirtual() && 4724 SMI.shouldDeleteForBase(BI)) 4725 return true; 4726 4727 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4728 BE = RD->vbases_end(); BI != BE; ++BI) 4729 if (SMI.shouldDeleteForBase(BI)) 4730 return true; 4731 4732 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4733 FE = RD->field_end(); FI != FE; ++FI) 4734 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 4735 SMI.shouldDeleteForField(*FI)) 4736 return true; 4737 4738 if (SMI.shouldDeleteForAllConstMembers()) 4739 return true; 4740 4741 return false; 4742} 4743 4744/// \brief Data used with FindHiddenVirtualMethod 4745namespace { 4746 struct FindHiddenVirtualMethodData { 4747 Sema *S; 4748 CXXMethodDecl *Method; 4749 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4750 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4751 }; 4752} 4753 4754/// \brief Member lookup function that determines whether a given C++ 4755/// method overloads virtual methods in a base class without overriding any, 4756/// to be used with CXXRecordDecl::lookupInBases(). 4757static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4758 CXXBasePath &Path, 4759 void *UserData) { 4760 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4761 4762 FindHiddenVirtualMethodData &Data 4763 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4764 4765 DeclarationName Name = Data.Method->getDeclName(); 4766 assert(Name.getNameKind() == DeclarationName::Identifier); 4767 4768 bool foundSameNameMethod = false; 4769 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4770 for (Path.Decls = BaseRecord->lookup(Name); 4771 Path.Decls.first != Path.Decls.second; 4772 ++Path.Decls.first) { 4773 NamedDecl *D = *Path.Decls.first; 4774 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4775 MD = MD->getCanonicalDecl(); 4776 foundSameNameMethod = true; 4777 // Interested only in hidden virtual methods. 4778 if (!MD->isVirtual()) 4779 continue; 4780 // If the method we are checking overrides a method from its base 4781 // don't warn about the other overloaded methods. 4782 if (!Data.S->IsOverload(Data.Method, MD, false)) 4783 return true; 4784 // Collect the overload only if its hidden. 4785 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4786 overloadedMethods.push_back(MD); 4787 } 4788 } 4789 4790 if (foundSameNameMethod) 4791 Data.OverloadedMethods.append(overloadedMethods.begin(), 4792 overloadedMethods.end()); 4793 return foundSameNameMethod; 4794} 4795 4796/// \brief See if a method overloads virtual methods in a base class without 4797/// overriding any. 4798void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4799 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4800 MD->getLocation()) == DiagnosticsEngine::Ignored) 4801 return; 4802 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4803 return; 4804 4805 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4806 /*bool RecordPaths=*/false, 4807 /*bool DetectVirtual=*/false); 4808 FindHiddenVirtualMethodData Data; 4809 Data.Method = MD; 4810 Data.S = this; 4811 4812 // Keep the base methods that were overriden or introduced in the subclass 4813 // by 'using' in a set. A base method not in this set is hidden. 4814 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4815 res.first != res.second; ++res.first) { 4816 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4817 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4818 E = MD->end_overridden_methods(); 4819 I != E; ++I) 4820 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4821 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4822 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4823 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4824 } 4825 4826 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4827 !Data.OverloadedMethods.empty()) { 4828 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4829 << MD << (Data.OverloadedMethods.size() > 1); 4830 4831 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4832 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4833 Diag(overloadedMD->getLocation(), 4834 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4835 } 4836 } 4837} 4838 4839void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4840 Decl *TagDecl, 4841 SourceLocation LBrac, 4842 SourceLocation RBrac, 4843 AttributeList *AttrList) { 4844 if (!TagDecl) 4845 return; 4846 4847 AdjustDeclIfTemplate(TagDecl); 4848 4849 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4850 // strict aliasing violation! 4851 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4852 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4853 4854 CheckCompletedCXXClass( 4855 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4856} 4857 4858/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4859/// special functions, such as the default constructor, copy 4860/// constructor, or destructor, to the given C++ class (C++ 4861/// [special]p1). This routine can only be executed just before the 4862/// definition of the class is complete. 4863void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4864 if (!ClassDecl->hasUserDeclaredConstructor()) 4865 ++ASTContext::NumImplicitDefaultConstructors; 4866 4867 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4868 ++ASTContext::NumImplicitCopyConstructors; 4869 4870 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 4871 ++ASTContext::NumImplicitMoveConstructors; 4872 4873 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4874 ++ASTContext::NumImplicitCopyAssignmentOperators; 4875 4876 // If we have a dynamic class, then the copy assignment operator may be 4877 // virtual, so we have to declare it immediately. This ensures that, e.g., 4878 // it shows up in the right place in the vtable and that we diagnose 4879 // problems with the implicit exception specification. 4880 if (ClassDecl->isDynamicClass()) 4881 DeclareImplicitCopyAssignment(ClassDecl); 4882 } 4883 4884 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()) { 4885 ++ASTContext::NumImplicitMoveAssignmentOperators; 4886 4887 // Likewise for the move assignment operator. 4888 if (ClassDecl->isDynamicClass()) 4889 DeclareImplicitMoveAssignment(ClassDecl); 4890 } 4891 4892 if (!ClassDecl->hasUserDeclaredDestructor()) { 4893 ++ASTContext::NumImplicitDestructors; 4894 4895 // If we have a dynamic class, then the destructor may be virtual, so we 4896 // have to declare the destructor immediately. This ensures that, e.g., it 4897 // shows up in the right place in the vtable and that we diagnose problems 4898 // with the implicit exception specification. 4899 if (ClassDecl->isDynamicClass()) 4900 DeclareImplicitDestructor(ClassDecl); 4901 } 4902} 4903 4904void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4905 if (!D) 4906 return; 4907 4908 int NumParamList = D->getNumTemplateParameterLists(); 4909 for (int i = 0; i < NumParamList; i++) { 4910 TemplateParameterList* Params = D->getTemplateParameterList(i); 4911 for (TemplateParameterList::iterator Param = Params->begin(), 4912 ParamEnd = Params->end(); 4913 Param != ParamEnd; ++Param) { 4914 NamedDecl *Named = cast<NamedDecl>(*Param); 4915 if (Named->getDeclName()) { 4916 S->AddDecl(Named); 4917 IdResolver.AddDecl(Named); 4918 } 4919 } 4920 } 4921} 4922 4923void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4924 if (!D) 4925 return; 4926 4927 TemplateParameterList *Params = 0; 4928 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4929 Params = Template->getTemplateParameters(); 4930 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4931 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4932 Params = PartialSpec->getTemplateParameters(); 4933 else 4934 return; 4935 4936 for (TemplateParameterList::iterator Param = Params->begin(), 4937 ParamEnd = Params->end(); 4938 Param != ParamEnd; ++Param) { 4939 NamedDecl *Named = cast<NamedDecl>(*Param); 4940 if (Named->getDeclName()) { 4941 S->AddDecl(Named); 4942 IdResolver.AddDecl(Named); 4943 } 4944 } 4945} 4946 4947void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4948 if (!RecordD) return; 4949 AdjustDeclIfTemplate(RecordD); 4950 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4951 PushDeclContext(S, Record); 4952} 4953 4954void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4955 if (!RecordD) return; 4956 PopDeclContext(); 4957} 4958 4959/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4960/// parsing a top-level (non-nested) C++ class, and we are now 4961/// parsing those parts of the given Method declaration that could 4962/// not be parsed earlier (C++ [class.mem]p2), such as default 4963/// arguments. This action should enter the scope of the given 4964/// Method declaration as if we had just parsed the qualified method 4965/// name. However, it should not bring the parameters into scope; 4966/// that will be performed by ActOnDelayedCXXMethodParameter. 4967void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4968} 4969 4970/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4971/// C++ method declaration. We're (re-)introducing the given 4972/// function parameter into scope for use in parsing later parts of 4973/// the method declaration. For example, we could see an 4974/// ActOnParamDefaultArgument event for this parameter. 4975void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4976 if (!ParamD) 4977 return; 4978 4979 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4980 4981 // If this parameter has an unparsed default argument, clear it out 4982 // to make way for the parsed default argument. 4983 if (Param->hasUnparsedDefaultArg()) 4984 Param->setDefaultArg(0); 4985 4986 S->AddDecl(Param); 4987 if (Param->getDeclName()) 4988 IdResolver.AddDecl(Param); 4989} 4990 4991/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4992/// processing the delayed method declaration for Method. The method 4993/// declaration is now considered finished. There may be a separate 4994/// ActOnStartOfFunctionDef action later (not necessarily 4995/// immediately!) for this method, if it was also defined inside the 4996/// class body. 4997void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4998 if (!MethodD) 4999 return; 5000 5001 AdjustDeclIfTemplate(MethodD); 5002 5003 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5004 5005 // Now that we have our default arguments, check the constructor 5006 // again. It could produce additional diagnostics or affect whether 5007 // the class has implicitly-declared destructors, among other 5008 // things. 5009 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5010 CheckConstructor(Constructor); 5011 5012 // Check the default arguments, which we may have added. 5013 if (!Method->isInvalidDecl()) 5014 CheckCXXDefaultArguments(Method); 5015} 5016 5017/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5018/// the well-formedness of the constructor declarator @p D with type @p 5019/// R. If there are any errors in the declarator, this routine will 5020/// emit diagnostics and set the invalid bit to true. In any case, the type 5021/// will be updated to reflect a well-formed type for the constructor and 5022/// returned. 5023QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5024 StorageClass &SC) { 5025 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5026 5027 // C++ [class.ctor]p3: 5028 // A constructor shall not be virtual (10.3) or static (9.4). A 5029 // constructor can be invoked for a const, volatile or const 5030 // volatile object. A constructor shall not be declared const, 5031 // volatile, or const volatile (9.3.2). 5032 if (isVirtual) { 5033 if (!D.isInvalidType()) 5034 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5035 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5036 << SourceRange(D.getIdentifierLoc()); 5037 D.setInvalidType(); 5038 } 5039 if (SC == SC_Static) { 5040 if (!D.isInvalidType()) 5041 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5042 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5043 << SourceRange(D.getIdentifierLoc()); 5044 D.setInvalidType(); 5045 SC = SC_None; 5046 } 5047 5048 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5049 if (FTI.TypeQuals != 0) { 5050 if (FTI.TypeQuals & Qualifiers::Const) 5051 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5052 << "const" << SourceRange(D.getIdentifierLoc()); 5053 if (FTI.TypeQuals & Qualifiers::Volatile) 5054 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5055 << "volatile" << SourceRange(D.getIdentifierLoc()); 5056 if (FTI.TypeQuals & Qualifiers::Restrict) 5057 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5058 << "restrict" << SourceRange(D.getIdentifierLoc()); 5059 D.setInvalidType(); 5060 } 5061 5062 // C++0x [class.ctor]p4: 5063 // A constructor shall not be declared with a ref-qualifier. 5064 if (FTI.hasRefQualifier()) { 5065 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5066 << FTI.RefQualifierIsLValueRef 5067 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5068 D.setInvalidType(); 5069 } 5070 5071 // Rebuild the function type "R" without any type qualifiers (in 5072 // case any of the errors above fired) and with "void" as the 5073 // return type, since constructors don't have return types. 5074 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5075 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5076 return R; 5077 5078 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5079 EPI.TypeQuals = 0; 5080 EPI.RefQualifier = RQ_None; 5081 5082 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5083 Proto->getNumArgs(), EPI); 5084} 5085 5086/// CheckConstructor - Checks a fully-formed constructor for 5087/// well-formedness, issuing any diagnostics required. Returns true if 5088/// the constructor declarator is invalid. 5089void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5090 CXXRecordDecl *ClassDecl 5091 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5092 if (!ClassDecl) 5093 return Constructor->setInvalidDecl(); 5094 5095 // C++ [class.copy]p3: 5096 // A declaration of a constructor for a class X is ill-formed if 5097 // its first parameter is of type (optionally cv-qualified) X and 5098 // either there are no other parameters or else all other 5099 // parameters have default arguments. 5100 if (!Constructor->isInvalidDecl() && 5101 ((Constructor->getNumParams() == 1) || 5102 (Constructor->getNumParams() > 1 && 5103 Constructor->getParamDecl(1)->hasDefaultArg())) && 5104 Constructor->getTemplateSpecializationKind() 5105 != TSK_ImplicitInstantiation) { 5106 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5107 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5108 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5109 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5110 const char *ConstRef 5111 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5112 : " const &"; 5113 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5114 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5115 5116 // FIXME: Rather that making the constructor invalid, we should endeavor 5117 // to fix the type. 5118 Constructor->setInvalidDecl(); 5119 } 5120 } 5121} 5122 5123/// CheckDestructor - Checks a fully-formed destructor definition for 5124/// well-formedness, issuing any diagnostics required. Returns true 5125/// on error. 5126bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5127 CXXRecordDecl *RD = Destructor->getParent(); 5128 5129 if (Destructor->isVirtual()) { 5130 SourceLocation Loc; 5131 5132 if (!Destructor->isImplicit()) 5133 Loc = Destructor->getLocation(); 5134 else 5135 Loc = RD->getLocation(); 5136 5137 // If we have a virtual destructor, look up the deallocation function 5138 FunctionDecl *OperatorDelete = 0; 5139 DeclarationName Name = 5140 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5141 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5142 return true; 5143 5144 MarkFunctionReferenced(Loc, OperatorDelete); 5145 5146 Destructor->setOperatorDelete(OperatorDelete); 5147 } 5148 5149 return false; 5150} 5151 5152static inline bool 5153FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5154 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5155 FTI.ArgInfo[0].Param && 5156 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5157} 5158 5159/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5160/// the well-formednes of the destructor declarator @p D with type @p 5161/// R. If there are any errors in the declarator, this routine will 5162/// emit diagnostics and set the declarator to invalid. Even if this happens, 5163/// will be updated to reflect a well-formed type for the destructor and 5164/// returned. 5165QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5166 StorageClass& SC) { 5167 // C++ [class.dtor]p1: 5168 // [...] A typedef-name that names a class is a class-name 5169 // (7.1.3); however, a typedef-name that names a class shall not 5170 // be used as the identifier in the declarator for a destructor 5171 // declaration. 5172 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5173 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5174 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5175 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5176 else if (const TemplateSpecializationType *TST = 5177 DeclaratorType->getAs<TemplateSpecializationType>()) 5178 if (TST->isTypeAlias()) 5179 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5180 << DeclaratorType << 1; 5181 5182 // C++ [class.dtor]p2: 5183 // A destructor is used to destroy objects of its class type. A 5184 // destructor takes no parameters, and no return type can be 5185 // specified for it (not even void). The address of a destructor 5186 // shall not be taken. A destructor shall not be static. A 5187 // destructor can be invoked for a const, volatile or const 5188 // volatile object. A destructor shall not be declared const, 5189 // volatile or const volatile (9.3.2). 5190 if (SC == SC_Static) { 5191 if (!D.isInvalidType()) 5192 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5193 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5194 << SourceRange(D.getIdentifierLoc()) 5195 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5196 5197 SC = SC_None; 5198 } 5199 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5200 // Destructors don't have return types, but the parser will 5201 // happily parse something like: 5202 // 5203 // class X { 5204 // float ~X(); 5205 // }; 5206 // 5207 // The return type will be eliminated later. 5208 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5209 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5210 << SourceRange(D.getIdentifierLoc()); 5211 } 5212 5213 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5214 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5215 if (FTI.TypeQuals & Qualifiers::Const) 5216 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5217 << "const" << SourceRange(D.getIdentifierLoc()); 5218 if (FTI.TypeQuals & Qualifiers::Volatile) 5219 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5220 << "volatile" << SourceRange(D.getIdentifierLoc()); 5221 if (FTI.TypeQuals & Qualifiers::Restrict) 5222 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5223 << "restrict" << SourceRange(D.getIdentifierLoc()); 5224 D.setInvalidType(); 5225 } 5226 5227 // C++0x [class.dtor]p2: 5228 // A destructor shall not be declared with a ref-qualifier. 5229 if (FTI.hasRefQualifier()) { 5230 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5231 << FTI.RefQualifierIsLValueRef 5232 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5233 D.setInvalidType(); 5234 } 5235 5236 // Make sure we don't have any parameters. 5237 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5238 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5239 5240 // Delete the parameters. 5241 FTI.freeArgs(); 5242 D.setInvalidType(); 5243 } 5244 5245 // Make sure the destructor isn't variadic. 5246 if (FTI.isVariadic) { 5247 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5248 D.setInvalidType(); 5249 } 5250 5251 // Rebuild the function type "R" without any type qualifiers or 5252 // parameters (in case any of the errors above fired) and with 5253 // "void" as the return type, since destructors don't have return 5254 // types. 5255 if (!D.isInvalidType()) 5256 return R; 5257 5258 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5259 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5260 EPI.Variadic = false; 5261 EPI.TypeQuals = 0; 5262 EPI.RefQualifier = RQ_None; 5263 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5264} 5265 5266/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5267/// well-formednes of the conversion function declarator @p D with 5268/// type @p R. If there are any errors in the declarator, this routine 5269/// will emit diagnostics and return true. Otherwise, it will return 5270/// false. Either way, the type @p R will be updated to reflect a 5271/// well-formed type for the conversion operator. 5272void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5273 StorageClass& SC) { 5274 // C++ [class.conv.fct]p1: 5275 // Neither parameter types nor return type can be specified. The 5276 // type of a conversion function (8.3.5) is "function taking no 5277 // parameter returning conversion-type-id." 5278 if (SC == SC_Static) { 5279 if (!D.isInvalidType()) 5280 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5281 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5282 << SourceRange(D.getIdentifierLoc()); 5283 D.setInvalidType(); 5284 SC = SC_None; 5285 } 5286 5287 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5288 5289 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5290 // Conversion functions don't have return types, but the parser will 5291 // happily parse something like: 5292 // 5293 // class X { 5294 // float operator bool(); 5295 // }; 5296 // 5297 // The return type will be changed later anyway. 5298 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5299 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5300 << SourceRange(D.getIdentifierLoc()); 5301 D.setInvalidType(); 5302 } 5303 5304 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5305 5306 // Make sure we don't have any parameters. 5307 if (Proto->getNumArgs() > 0) { 5308 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5309 5310 // Delete the parameters. 5311 D.getFunctionTypeInfo().freeArgs(); 5312 D.setInvalidType(); 5313 } else if (Proto->isVariadic()) { 5314 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5315 D.setInvalidType(); 5316 } 5317 5318 // Diagnose "&operator bool()" and other such nonsense. This 5319 // is actually a gcc extension which we don't support. 5320 if (Proto->getResultType() != ConvType) { 5321 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5322 << Proto->getResultType(); 5323 D.setInvalidType(); 5324 ConvType = Proto->getResultType(); 5325 } 5326 5327 // C++ [class.conv.fct]p4: 5328 // The conversion-type-id shall not represent a function type nor 5329 // an array type. 5330 if (ConvType->isArrayType()) { 5331 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5332 ConvType = Context.getPointerType(ConvType); 5333 D.setInvalidType(); 5334 } else if (ConvType->isFunctionType()) { 5335 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5336 ConvType = Context.getPointerType(ConvType); 5337 D.setInvalidType(); 5338 } 5339 5340 // Rebuild the function type "R" without any parameters (in case any 5341 // of the errors above fired) and with the conversion type as the 5342 // return type. 5343 if (D.isInvalidType()) 5344 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5345 5346 // C++0x explicit conversion operators. 5347 if (D.getDeclSpec().isExplicitSpecified()) 5348 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5349 getLangOpts().CPlusPlus0x ? 5350 diag::warn_cxx98_compat_explicit_conversion_functions : 5351 diag::ext_explicit_conversion_functions) 5352 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5353} 5354 5355/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5356/// the declaration of the given C++ conversion function. This routine 5357/// is responsible for recording the conversion function in the C++ 5358/// class, if possible. 5359Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5360 assert(Conversion && "Expected to receive a conversion function declaration"); 5361 5362 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5363 5364 // Make sure we aren't redeclaring the conversion function. 5365 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5366 5367 // C++ [class.conv.fct]p1: 5368 // [...] A conversion function is never used to convert a 5369 // (possibly cv-qualified) object to the (possibly cv-qualified) 5370 // same object type (or a reference to it), to a (possibly 5371 // cv-qualified) base class of that type (or a reference to it), 5372 // or to (possibly cv-qualified) void. 5373 // FIXME: Suppress this warning if the conversion function ends up being a 5374 // virtual function that overrides a virtual function in a base class. 5375 QualType ClassType 5376 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5377 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5378 ConvType = ConvTypeRef->getPointeeType(); 5379 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5380 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5381 /* Suppress diagnostics for instantiations. */; 5382 else if (ConvType->isRecordType()) { 5383 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5384 if (ConvType == ClassType) 5385 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5386 << ClassType; 5387 else if (IsDerivedFrom(ClassType, ConvType)) 5388 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5389 << ClassType << ConvType; 5390 } else if (ConvType->isVoidType()) { 5391 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5392 << ClassType << ConvType; 5393 } 5394 5395 if (FunctionTemplateDecl *ConversionTemplate 5396 = Conversion->getDescribedFunctionTemplate()) 5397 return ConversionTemplate; 5398 5399 return Conversion; 5400} 5401 5402//===----------------------------------------------------------------------===// 5403// Namespace Handling 5404//===----------------------------------------------------------------------===// 5405 5406 5407 5408/// ActOnStartNamespaceDef - This is called at the start of a namespace 5409/// definition. 5410Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5411 SourceLocation InlineLoc, 5412 SourceLocation NamespaceLoc, 5413 SourceLocation IdentLoc, 5414 IdentifierInfo *II, 5415 SourceLocation LBrace, 5416 AttributeList *AttrList) { 5417 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5418 // For anonymous namespace, take the location of the left brace. 5419 SourceLocation Loc = II ? IdentLoc : LBrace; 5420 bool IsInline = InlineLoc.isValid(); 5421 bool IsInvalid = false; 5422 bool IsStd = false; 5423 bool AddToKnown = false; 5424 Scope *DeclRegionScope = NamespcScope->getParent(); 5425 5426 NamespaceDecl *PrevNS = 0; 5427 if (II) { 5428 // C++ [namespace.def]p2: 5429 // The identifier in an original-namespace-definition shall not 5430 // have been previously defined in the declarative region in 5431 // which the original-namespace-definition appears. The 5432 // identifier in an original-namespace-definition is the name of 5433 // the namespace. Subsequently in that declarative region, it is 5434 // treated as an original-namespace-name. 5435 // 5436 // Since namespace names are unique in their scope, and we don't 5437 // look through using directives, just look for any ordinary names. 5438 5439 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5440 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5441 Decl::IDNS_Namespace; 5442 NamedDecl *PrevDecl = 0; 5443 for (DeclContext::lookup_result R 5444 = CurContext->getRedeclContext()->lookup(II); 5445 R.first != R.second; ++R.first) { 5446 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5447 PrevDecl = *R.first; 5448 break; 5449 } 5450 } 5451 5452 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5453 5454 if (PrevNS) { 5455 // This is an extended namespace definition. 5456 if (IsInline != PrevNS->isInline()) { 5457 // inline-ness must match 5458 if (PrevNS->isInline()) { 5459 // The user probably just forgot the 'inline', so suggest that it 5460 // be added back. 5461 Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5462 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5463 } else { 5464 Diag(Loc, diag::err_inline_namespace_mismatch) 5465 << IsInline; 5466 } 5467 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5468 5469 IsInline = PrevNS->isInline(); 5470 } 5471 } else if (PrevDecl) { 5472 // This is an invalid name redefinition. 5473 Diag(Loc, diag::err_redefinition_different_kind) 5474 << II; 5475 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5476 IsInvalid = true; 5477 // Continue on to push Namespc as current DeclContext and return it. 5478 } else if (II->isStr("std") && 5479 CurContext->getRedeclContext()->isTranslationUnit()) { 5480 // This is the first "real" definition of the namespace "std", so update 5481 // our cache of the "std" namespace to point at this definition. 5482 PrevNS = getStdNamespace(); 5483 IsStd = true; 5484 AddToKnown = !IsInline; 5485 } else { 5486 // We've seen this namespace for the first time. 5487 AddToKnown = !IsInline; 5488 } 5489 } else { 5490 // Anonymous namespaces. 5491 5492 // Determine whether the parent already has an anonymous namespace. 5493 DeclContext *Parent = CurContext->getRedeclContext(); 5494 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5495 PrevNS = TU->getAnonymousNamespace(); 5496 } else { 5497 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5498 PrevNS = ND->getAnonymousNamespace(); 5499 } 5500 5501 if (PrevNS && IsInline != PrevNS->isInline()) { 5502 // inline-ness must match 5503 Diag(Loc, diag::err_inline_namespace_mismatch) 5504 << IsInline; 5505 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5506 5507 // Recover by ignoring the new namespace's inline status. 5508 IsInline = PrevNS->isInline(); 5509 } 5510 } 5511 5512 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5513 StartLoc, Loc, II, PrevNS); 5514 if (IsInvalid) 5515 Namespc->setInvalidDecl(); 5516 5517 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5518 5519 // FIXME: Should we be merging attributes? 5520 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5521 PushNamespaceVisibilityAttr(Attr, Loc); 5522 5523 if (IsStd) 5524 StdNamespace = Namespc; 5525 if (AddToKnown) 5526 KnownNamespaces[Namespc] = false; 5527 5528 if (II) { 5529 PushOnScopeChains(Namespc, DeclRegionScope); 5530 } else { 5531 // Link the anonymous namespace into its parent. 5532 DeclContext *Parent = CurContext->getRedeclContext(); 5533 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5534 TU->setAnonymousNamespace(Namespc); 5535 } else { 5536 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5537 } 5538 5539 CurContext->addDecl(Namespc); 5540 5541 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5542 // behaves as if it were replaced by 5543 // namespace unique { /* empty body */ } 5544 // using namespace unique; 5545 // namespace unique { namespace-body } 5546 // where all occurrences of 'unique' in a translation unit are 5547 // replaced by the same identifier and this identifier differs 5548 // from all other identifiers in the entire program. 5549 5550 // We just create the namespace with an empty name and then add an 5551 // implicit using declaration, just like the standard suggests. 5552 // 5553 // CodeGen enforces the "universally unique" aspect by giving all 5554 // declarations semantically contained within an anonymous 5555 // namespace internal linkage. 5556 5557 if (!PrevNS) { 5558 UsingDirectiveDecl* UD 5559 = UsingDirectiveDecl::Create(Context, CurContext, 5560 /* 'using' */ LBrace, 5561 /* 'namespace' */ SourceLocation(), 5562 /* qualifier */ NestedNameSpecifierLoc(), 5563 /* identifier */ SourceLocation(), 5564 Namespc, 5565 /* Ancestor */ CurContext); 5566 UD->setImplicit(); 5567 CurContext->addDecl(UD); 5568 } 5569 } 5570 5571 // Although we could have an invalid decl (i.e. the namespace name is a 5572 // redefinition), push it as current DeclContext and try to continue parsing. 5573 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5574 // for the namespace has the declarations that showed up in that particular 5575 // namespace definition. 5576 PushDeclContext(NamespcScope, Namespc); 5577 return Namespc; 5578} 5579 5580/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5581/// is a namespace alias, returns the namespace it points to. 5582static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5583 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5584 return AD->getNamespace(); 5585 return dyn_cast_or_null<NamespaceDecl>(D); 5586} 5587 5588/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5589/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5590void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5591 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5592 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5593 Namespc->setRBraceLoc(RBrace); 5594 PopDeclContext(); 5595 if (Namespc->hasAttr<VisibilityAttr>()) 5596 PopPragmaVisibility(true, RBrace); 5597} 5598 5599CXXRecordDecl *Sema::getStdBadAlloc() const { 5600 return cast_or_null<CXXRecordDecl>( 5601 StdBadAlloc.get(Context.getExternalSource())); 5602} 5603 5604NamespaceDecl *Sema::getStdNamespace() const { 5605 return cast_or_null<NamespaceDecl>( 5606 StdNamespace.get(Context.getExternalSource())); 5607} 5608 5609/// \brief Retrieve the special "std" namespace, which may require us to 5610/// implicitly define the namespace. 5611NamespaceDecl *Sema::getOrCreateStdNamespace() { 5612 if (!StdNamespace) { 5613 // The "std" namespace has not yet been defined, so build one implicitly. 5614 StdNamespace = NamespaceDecl::Create(Context, 5615 Context.getTranslationUnitDecl(), 5616 /*Inline=*/false, 5617 SourceLocation(), SourceLocation(), 5618 &PP.getIdentifierTable().get("std"), 5619 /*PrevDecl=*/0); 5620 getStdNamespace()->setImplicit(true); 5621 } 5622 5623 return getStdNamespace(); 5624} 5625 5626bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 5627 assert(getLangOpts().CPlusPlus && 5628 "Looking for std::initializer_list outside of C++."); 5629 5630 // We're looking for implicit instantiations of 5631 // template <typename E> class std::initializer_list. 5632 5633 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 5634 return false; 5635 5636 ClassTemplateDecl *Template = 0; 5637 const TemplateArgument *Arguments = 0; 5638 5639 if (const RecordType *RT = Ty->getAs<RecordType>()) { 5640 5641 ClassTemplateSpecializationDecl *Specialization = 5642 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 5643 if (!Specialization) 5644 return false; 5645 5646 Template = Specialization->getSpecializedTemplate(); 5647 Arguments = Specialization->getTemplateArgs().data(); 5648 } else if (const TemplateSpecializationType *TST = 5649 Ty->getAs<TemplateSpecializationType>()) { 5650 Template = dyn_cast_or_null<ClassTemplateDecl>( 5651 TST->getTemplateName().getAsTemplateDecl()); 5652 Arguments = TST->getArgs(); 5653 } 5654 if (!Template) 5655 return false; 5656 5657 if (!StdInitializerList) { 5658 // Haven't recognized std::initializer_list yet, maybe this is it. 5659 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 5660 if (TemplateClass->getIdentifier() != 5661 &PP.getIdentifierTable().get("initializer_list") || 5662 !getStdNamespace()->InEnclosingNamespaceSetOf( 5663 TemplateClass->getDeclContext())) 5664 return false; 5665 // This is a template called std::initializer_list, but is it the right 5666 // template? 5667 TemplateParameterList *Params = Template->getTemplateParameters(); 5668 if (Params->getMinRequiredArguments() != 1) 5669 return false; 5670 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 5671 return false; 5672 5673 // It's the right template. 5674 StdInitializerList = Template; 5675 } 5676 5677 if (Template != StdInitializerList) 5678 return false; 5679 5680 // This is an instance of std::initializer_list. Find the argument type. 5681 if (Element) 5682 *Element = Arguments[0].getAsType(); 5683 return true; 5684} 5685 5686static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 5687 NamespaceDecl *Std = S.getStdNamespace(); 5688 if (!Std) { 5689 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5690 return 0; 5691 } 5692 5693 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 5694 Loc, Sema::LookupOrdinaryName); 5695 if (!S.LookupQualifiedName(Result, Std)) { 5696 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5697 return 0; 5698 } 5699 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 5700 if (!Template) { 5701 Result.suppressDiagnostics(); 5702 // We found something weird. Complain about the first thing we found. 5703 NamedDecl *Found = *Result.begin(); 5704 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 5705 return 0; 5706 } 5707 5708 // We found some template called std::initializer_list. Now verify that it's 5709 // correct. 5710 TemplateParameterList *Params = Template->getTemplateParameters(); 5711 if (Params->getMinRequiredArguments() != 1 || 5712 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 5713 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 5714 return 0; 5715 } 5716 5717 return Template; 5718} 5719 5720QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 5721 if (!StdInitializerList) { 5722 StdInitializerList = LookupStdInitializerList(*this, Loc); 5723 if (!StdInitializerList) 5724 return QualType(); 5725 } 5726 5727 TemplateArgumentListInfo Args(Loc, Loc); 5728 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 5729 Context.getTrivialTypeSourceInfo(Element, 5730 Loc))); 5731 return Context.getCanonicalType( 5732 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 5733} 5734 5735bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 5736 // C++ [dcl.init.list]p2: 5737 // A constructor is an initializer-list constructor if its first parameter 5738 // is of type std::initializer_list<E> or reference to possibly cv-qualified 5739 // std::initializer_list<E> for some type E, and either there are no other 5740 // parameters or else all other parameters have default arguments. 5741 if (Ctor->getNumParams() < 1 || 5742 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 5743 return false; 5744 5745 QualType ArgType = Ctor->getParamDecl(0)->getType(); 5746 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 5747 ArgType = RT->getPointeeType().getUnqualifiedType(); 5748 5749 return isStdInitializerList(ArgType, 0); 5750} 5751 5752/// \brief Determine whether a using statement is in a context where it will be 5753/// apply in all contexts. 5754static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5755 switch (CurContext->getDeclKind()) { 5756 case Decl::TranslationUnit: 5757 return true; 5758 case Decl::LinkageSpec: 5759 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5760 default: 5761 return false; 5762 } 5763} 5764 5765namespace { 5766 5767// Callback to only accept typo corrections that are namespaces. 5768class NamespaceValidatorCCC : public CorrectionCandidateCallback { 5769 public: 5770 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5771 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 5772 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 5773 } 5774 return false; 5775 } 5776}; 5777 5778} 5779 5780static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5781 CXXScopeSpec &SS, 5782 SourceLocation IdentLoc, 5783 IdentifierInfo *Ident) { 5784 NamespaceValidatorCCC Validator; 5785 R.clear(); 5786 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5787 R.getLookupKind(), Sc, &SS, 5788 Validator)) { 5789 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 5790 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOpts())); 5791 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5792 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5793 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5794 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5795 else 5796 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5797 << Ident << CorrectedQuotedStr 5798 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5799 5800 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5801 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5802 5803 R.addDecl(Corrected.getCorrectionDecl()); 5804 return true; 5805 } 5806 return false; 5807} 5808 5809Decl *Sema::ActOnUsingDirective(Scope *S, 5810 SourceLocation UsingLoc, 5811 SourceLocation NamespcLoc, 5812 CXXScopeSpec &SS, 5813 SourceLocation IdentLoc, 5814 IdentifierInfo *NamespcName, 5815 AttributeList *AttrList) { 5816 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5817 assert(NamespcName && "Invalid NamespcName."); 5818 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5819 5820 // This can only happen along a recovery path. 5821 while (S->getFlags() & Scope::TemplateParamScope) 5822 S = S->getParent(); 5823 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5824 5825 UsingDirectiveDecl *UDir = 0; 5826 NestedNameSpecifier *Qualifier = 0; 5827 if (SS.isSet()) 5828 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5829 5830 // Lookup namespace name. 5831 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5832 LookupParsedName(R, S, &SS); 5833 if (R.isAmbiguous()) 5834 return 0; 5835 5836 if (R.empty()) { 5837 R.clear(); 5838 // Allow "using namespace std;" or "using namespace ::std;" even if 5839 // "std" hasn't been defined yet, for GCC compatibility. 5840 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5841 NamespcName->isStr("std")) { 5842 Diag(IdentLoc, diag::ext_using_undefined_std); 5843 R.addDecl(getOrCreateStdNamespace()); 5844 R.resolveKind(); 5845 } 5846 // Otherwise, attempt typo correction. 5847 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5848 } 5849 5850 if (!R.empty()) { 5851 NamedDecl *Named = R.getFoundDecl(); 5852 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5853 && "expected namespace decl"); 5854 // C++ [namespace.udir]p1: 5855 // A using-directive specifies that the names in the nominated 5856 // namespace can be used in the scope in which the 5857 // using-directive appears after the using-directive. During 5858 // unqualified name lookup (3.4.1), the names appear as if they 5859 // were declared in the nearest enclosing namespace which 5860 // contains both the using-directive and the nominated 5861 // namespace. [Note: in this context, "contains" means "contains 5862 // directly or indirectly". ] 5863 5864 // Find enclosing context containing both using-directive and 5865 // nominated namespace. 5866 NamespaceDecl *NS = getNamespaceDecl(Named); 5867 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5868 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5869 CommonAncestor = CommonAncestor->getParent(); 5870 5871 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5872 SS.getWithLocInContext(Context), 5873 IdentLoc, Named, CommonAncestor); 5874 5875 if (IsUsingDirectiveInToplevelContext(CurContext) && 5876 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5877 Diag(IdentLoc, diag::warn_using_directive_in_header); 5878 } 5879 5880 PushUsingDirective(S, UDir); 5881 } else { 5882 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5883 } 5884 5885 // FIXME: We ignore attributes for now. 5886 return UDir; 5887} 5888 5889void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5890 // If the scope has an associated entity and the using directive is at 5891 // namespace or translation unit scope, add the UsingDirectiveDecl into 5892 // its lookup structure so qualified name lookup can find it. 5893 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()); 5894 if (Ctx && !Ctx->isFunctionOrMethod()) 5895 Ctx->addDecl(UDir); 5896 else 5897 // Otherwise, it is at block sope. The using-directives will affect lookup 5898 // only to the end of the scope. 5899 S->PushUsingDirective(UDir); 5900} 5901 5902 5903Decl *Sema::ActOnUsingDeclaration(Scope *S, 5904 AccessSpecifier AS, 5905 bool HasUsingKeyword, 5906 SourceLocation UsingLoc, 5907 CXXScopeSpec &SS, 5908 UnqualifiedId &Name, 5909 AttributeList *AttrList, 5910 bool IsTypeName, 5911 SourceLocation TypenameLoc) { 5912 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5913 5914 switch (Name.getKind()) { 5915 case UnqualifiedId::IK_ImplicitSelfParam: 5916 case UnqualifiedId::IK_Identifier: 5917 case UnqualifiedId::IK_OperatorFunctionId: 5918 case UnqualifiedId::IK_LiteralOperatorId: 5919 case UnqualifiedId::IK_ConversionFunctionId: 5920 break; 5921 5922 case UnqualifiedId::IK_ConstructorName: 5923 case UnqualifiedId::IK_ConstructorTemplateId: 5924 // C++0x inherited constructors. 5925 Diag(Name.getLocStart(), 5926 getLangOpts().CPlusPlus0x ? 5927 diag::warn_cxx98_compat_using_decl_constructor : 5928 diag::err_using_decl_constructor) 5929 << SS.getRange(); 5930 5931 if (getLangOpts().CPlusPlus0x) break; 5932 5933 return 0; 5934 5935 case UnqualifiedId::IK_DestructorName: 5936 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 5937 << SS.getRange(); 5938 return 0; 5939 5940 case UnqualifiedId::IK_TemplateId: 5941 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 5942 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5943 return 0; 5944 } 5945 5946 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5947 DeclarationName TargetName = TargetNameInfo.getName(); 5948 if (!TargetName) 5949 return 0; 5950 5951 // Warn about using declarations. 5952 // TODO: store that the declaration was written without 'using' and 5953 // talk about access decls instead of using decls in the 5954 // diagnostics. 5955 if (!HasUsingKeyword) { 5956 UsingLoc = Name.getLocStart(); 5957 5958 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5959 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5960 } 5961 5962 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5963 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5964 return 0; 5965 5966 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5967 TargetNameInfo, AttrList, 5968 /* IsInstantiation */ false, 5969 IsTypeName, TypenameLoc); 5970 if (UD) 5971 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5972 5973 return UD; 5974} 5975 5976/// \brief Determine whether a using declaration considers the given 5977/// declarations as "equivalent", e.g., if they are redeclarations of 5978/// the same entity or are both typedefs of the same type. 5979static bool 5980IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5981 bool &SuppressRedeclaration) { 5982 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5983 SuppressRedeclaration = false; 5984 return true; 5985 } 5986 5987 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5988 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5989 SuppressRedeclaration = true; 5990 return Context.hasSameType(TD1->getUnderlyingType(), 5991 TD2->getUnderlyingType()); 5992 } 5993 5994 return false; 5995} 5996 5997 5998/// Determines whether to create a using shadow decl for a particular 5999/// decl, given the set of decls existing prior to this using lookup. 6000bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 6001 const LookupResult &Previous) { 6002 // Diagnose finding a decl which is not from a base class of the 6003 // current class. We do this now because there are cases where this 6004 // function will silently decide not to build a shadow decl, which 6005 // will pre-empt further diagnostics. 6006 // 6007 // We don't need to do this in C++0x because we do the check once on 6008 // the qualifier. 6009 // 6010 // FIXME: diagnose the following if we care enough: 6011 // struct A { int foo; }; 6012 // struct B : A { using A::foo; }; 6013 // template <class T> struct C : A {}; 6014 // template <class T> struct D : C<T> { using B::foo; } // <--- 6015 // This is invalid (during instantiation) in C++03 because B::foo 6016 // resolves to the using decl in B, which is not a base class of D<T>. 6017 // We can't diagnose it immediately because C<T> is an unknown 6018 // specialization. The UsingShadowDecl in D<T> then points directly 6019 // to A::foo, which will look well-formed when we instantiate. 6020 // The right solution is to not collapse the shadow-decl chain. 6021 if (!getLangOpts().CPlusPlus0x && CurContext->isRecord()) { 6022 DeclContext *OrigDC = Orig->getDeclContext(); 6023 6024 // Handle enums and anonymous structs. 6025 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 6026 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 6027 while (OrigRec->isAnonymousStructOrUnion()) 6028 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 6029 6030 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 6031 if (OrigDC == CurContext) { 6032 Diag(Using->getLocation(), 6033 diag::err_using_decl_nested_name_specifier_is_current_class) 6034 << Using->getQualifierLoc().getSourceRange(); 6035 Diag(Orig->getLocation(), diag::note_using_decl_target); 6036 return true; 6037 } 6038 6039 Diag(Using->getQualifierLoc().getBeginLoc(), 6040 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6041 << Using->getQualifier() 6042 << cast<CXXRecordDecl>(CurContext) 6043 << Using->getQualifierLoc().getSourceRange(); 6044 Diag(Orig->getLocation(), diag::note_using_decl_target); 6045 return true; 6046 } 6047 } 6048 6049 if (Previous.empty()) return false; 6050 6051 NamedDecl *Target = Orig; 6052 if (isa<UsingShadowDecl>(Target)) 6053 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6054 6055 // If the target happens to be one of the previous declarations, we 6056 // don't have a conflict. 6057 // 6058 // FIXME: but we might be increasing its access, in which case we 6059 // should redeclare it. 6060 NamedDecl *NonTag = 0, *Tag = 0; 6061 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 6062 I != E; ++I) { 6063 NamedDecl *D = (*I)->getUnderlyingDecl(); 6064 bool Result; 6065 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 6066 return Result; 6067 6068 (isa<TagDecl>(D) ? Tag : NonTag) = D; 6069 } 6070 6071 if (Target->isFunctionOrFunctionTemplate()) { 6072 FunctionDecl *FD; 6073 if (isa<FunctionTemplateDecl>(Target)) 6074 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6075 else 6076 FD = cast<FunctionDecl>(Target); 6077 6078 NamedDecl *OldDecl = 0; 6079 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6080 case Ovl_Overload: 6081 return false; 6082 6083 case Ovl_NonFunction: 6084 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6085 break; 6086 6087 // We found a decl with the exact signature. 6088 case Ovl_Match: 6089 // If we're in a record, we want to hide the target, so we 6090 // return true (without a diagnostic) to tell the caller not to 6091 // build a shadow decl. 6092 if (CurContext->isRecord()) 6093 return true; 6094 6095 // If we're not in a record, this is an error. 6096 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6097 break; 6098 } 6099 6100 Diag(Target->getLocation(), diag::note_using_decl_target); 6101 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6102 return true; 6103 } 6104 6105 // Target is not a function. 6106 6107 if (isa<TagDecl>(Target)) { 6108 // No conflict between a tag and a non-tag. 6109 if (!Tag) return false; 6110 6111 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6112 Diag(Target->getLocation(), diag::note_using_decl_target); 6113 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6114 return true; 6115 } 6116 6117 // No conflict between a tag and a non-tag. 6118 if (!NonTag) return false; 6119 6120 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6121 Diag(Target->getLocation(), diag::note_using_decl_target); 6122 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6123 return true; 6124} 6125 6126/// Builds a shadow declaration corresponding to a 'using' declaration. 6127UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6128 UsingDecl *UD, 6129 NamedDecl *Orig) { 6130 6131 // If we resolved to another shadow declaration, just coalesce them. 6132 NamedDecl *Target = Orig; 6133 if (isa<UsingShadowDecl>(Target)) { 6134 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6135 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6136 } 6137 6138 UsingShadowDecl *Shadow 6139 = UsingShadowDecl::Create(Context, CurContext, 6140 UD->getLocation(), UD, Target); 6141 UD->addShadowDecl(Shadow); 6142 6143 Shadow->setAccess(UD->getAccess()); 6144 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6145 Shadow->setInvalidDecl(); 6146 6147 if (S) 6148 PushOnScopeChains(Shadow, S); 6149 else 6150 CurContext->addDecl(Shadow); 6151 6152 6153 return Shadow; 6154} 6155 6156/// Hides a using shadow declaration. This is required by the current 6157/// using-decl implementation when a resolvable using declaration in a 6158/// class is followed by a declaration which would hide or override 6159/// one or more of the using decl's targets; for example: 6160/// 6161/// struct Base { void foo(int); }; 6162/// struct Derived : Base { 6163/// using Base::foo; 6164/// void foo(int); 6165/// }; 6166/// 6167/// The governing language is C++03 [namespace.udecl]p12: 6168/// 6169/// When a using-declaration brings names from a base class into a 6170/// derived class scope, member functions in the derived class 6171/// override and/or hide member functions with the same name and 6172/// parameter types in a base class (rather than conflicting). 6173/// 6174/// There are two ways to implement this: 6175/// (1) optimistically create shadow decls when they're not hidden 6176/// by existing declarations, or 6177/// (2) don't create any shadow decls (or at least don't make them 6178/// visible) until we've fully parsed/instantiated the class. 6179/// The problem with (1) is that we might have to retroactively remove 6180/// a shadow decl, which requires several O(n) operations because the 6181/// decl structures are (very reasonably) not designed for removal. 6182/// (2) avoids this but is very fiddly and phase-dependent. 6183void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6184 if (Shadow->getDeclName().getNameKind() == 6185 DeclarationName::CXXConversionFunctionName) 6186 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6187 6188 // Remove it from the DeclContext... 6189 Shadow->getDeclContext()->removeDecl(Shadow); 6190 6191 // ...and the scope, if applicable... 6192 if (S) { 6193 S->RemoveDecl(Shadow); 6194 IdResolver.RemoveDecl(Shadow); 6195 } 6196 6197 // ...and the using decl. 6198 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6199 6200 // TODO: complain somehow if Shadow was used. It shouldn't 6201 // be possible for this to happen, because...? 6202} 6203 6204/// Builds a using declaration. 6205/// 6206/// \param IsInstantiation - Whether this call arises from an 6207/// instantiation of an unresolved using declaration. We treat 6208/// the lookup differently for these declarations. 6209NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6210 SourceLocation UsingLoc, 6211 CXXScopeSpec &SS, 6212 const DeclarationNameInfo &NameInfo, 6213 AttributeList *AttrList, 6214 bool IsInstantiation, 6215 bool IsTypeName, 6216 SourceLocation TypenameLoc) { 6217 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6218 SourceLocation IdentLoc = NameInfo.getLoc(); 6219 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6220 6221 // FIXME: We ignore attributes for now. 6222 6223 if (SS.isEmpty()) { 6224 Diag(IdentLoc, diag::err_using_requires_qualname); 6225 return 0; 6226 } 6227 6228 // Do the redeclaration lookup in the current scope. 6229 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6230 ForRedeclaration); 6231 Previous.setHideTags(false); 6232 if (S) { 6233 LookupName(Previous, S); 6234 6235 // It is really dumb that we have to do this. 6236 LookupResult::Filter F = Previous.makeFilter(); 6237 while (F.hasNext()) { 6238 NamedDecl *D = F.next(); 6239 if (!isDeclInScope(D, CurContext, S)) 6240 F.erase(); 6241 } 6242 F.done(); 6243 } else { 6244 assert(IsInstantiation && "no scope in non-instantiation"); 6245 assert(CurContext->isRecord() && "scope not record in instantiation"); 6246 LookupQualifiedName(Previous, CurContext); 6247 } 6248 6249 // Check for invalid redeclarations. 6250 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6251 return 0; 6252 6253 // Check for bad qualifiers. 6254 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6255 return 0; 6256 6257 DeclContext *LookupContext = computeDeclContext(SS); 6258 NamedDecl *D; 6259 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6260 if (!LookupContext) { 6261 if (IsTypeName) { 6262 // FIXME: not all declaration name kinds are legal here 6263 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6264 UsingLoc, TypenameLoc, 6265 QualifierLoc, 6266 IdentLoc, NameInfo.getName()); 6267 } else { 6268 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6269 QualifierLoc, NameInfo); 6270 } 6271 } else { 6272 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6273 NameInfo, IsTypeName); 6274 } 6275 D->setAccess(AS); 6276 CurContext->addDecl(D); 6277 6278 if (!LookupContext) return D; 6279 UsingDecl *UD = cast<UsingDecl>(D); 6280 6281 if (RequireCompleteDeclContext(SS, LookupContext)) { 6282 UD->setInvalidDecl(); 6283 return UD; 6284 } 6285 6286 // The normal rules do not apply to inheriting constructor declarations. 6287 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6288 if (CheckInheritingConstructorUsingDecl(UD)) 6289 UD->setInvalidDecl(); 6290 return UD; 6291 } 6292 6293 // Otherwise, look up the target name. 6294 6295 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6296 6297 // Unlike most lookups, we don't always want to hide tag 6298 // declarations: tag names are visible through the using declaration 6299 // even if hidden by ordinary names, *except* in a dependent context 6300 // where it's important for the sanity of two-phase lookup. 6301 if (!IsInstantiation) 6302 R.setHideTags(false); 6303 6304 // For the purposes of this lookup, we have a base object type 6305 // equal to that of the current context. 6306 if (CurContext->isRecord()) { 6307 R.setBaseObjectType( 6308 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); 6309 } 6310 6311 LookupQualifiedName(R, LookupContext); 6312 6313 if (R.empty()) { 6314 Diag(IdentLoc, diag::err_no_member) 6315 << NameInfo.getName() << LookupContext << SS.getRange(); 6316 UD->setInvalidDecl(); 6317 return UD; 6318 } 6319 6320 if (R.isAmbiguous()) { 6321 UD->setInvalidDecl(); 6322 return UD; 6323 } 6324 6325 if (IsTypeName) { 6326 // If we asked for a typename and got a non-type decl, error out. 6327 if (!R.getAsSingle<TypeDecl>()) { 6328 Diag(IdentLoc, diag::err_using_typename_non_type); 6329 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6330 Diag((*I)->getUnderlyingDecl()->getLocation(), 6331 diag::note_using_decl_target); 6332 UD->setInvalidDecl(); 6333 return UD; 6334 } 6335 } else { 6336 // If we asked for a non-typename and we got a type, error out, 6337 // but only if this is an instantiation of an unresolved using 6338 // decl. Otherwise just silently find the type name. 6339 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6340 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6341 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6342 UD->setInvalidDecl(); 6343 return UD; 6344 } 6345 } 6346 6347 // C++0x N2914 [namespace.udecl]p6: 6348 // A using-declaration shall not name a namespace. 6349 if (R.getAsSingle<NamespaceDecl>()) { 6350 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6351 << SS.getRange(); 6352 UD->setInvalidDecl(); 6353 return UD; 6354 } 6355 6356 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6357 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6358 BuildUsingShadowDecl(S, UD, *I); 6359 } 6360 6361 return UD; 6362} 6363 6364/// Additional checks for a using declaration referring to a constructor name. 6365bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { 6366 assert(!UD->isTypeName() && "expecting a constructor name"); 6367 6368 const Type *SourceType = UD->getQualifier()->getAsType(); 6369 assert(SourceType && 6370 "Using decl naming constructor doesn't have type in scope spec."); 6371 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6372 6373 // Check whether the named type is a direct base class. 6374 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6375 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6376 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6377 BaseIt != BaseE; ++BaseIt) { 6378 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6379 if (CanonicalSourceType == BaseType) 6380 break; 6381 if (BaseIt->getType()->isDependentType()) 6382 break; 6383 } 6384 6385 if (BaseIt == BaseE) { 6386 // Did not find SourceType in the bases. 6387 Diag(UD->getUsingLocation(), 6388 diag::err_using_decl_constructor_not_in_direct_base) 6389 << UD->getNameInfo().getSourceRange() 6390 << QualType(SourceType, 0) << TargetClass; 6391 return true; 6392 } 6393 6394 if (!CurContext->isDependentContext()) 6395 BaseIt->setInheritConstructors(); 6396 6397 return false; 6398} 6399 6400/// Checks that the given using declaration is not an invalid 6401/// redeclaration. Note that this is checking only for the using decl 6402/// itself, not for any ill-formedness among the UsingShadowDecls. 6403bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6404 bool isTypeName, 6405 const CXXScopeSpec &SS, 6406 SourceLocation NameLoc, 6407 const LookupResult &Prev) { 6408 // C++03 [namespace.udecl]p8: 6409 // C++0x [namespace.udecl]p10: 6410 // A using-declaration is a declaration and can therefore be used 6411 // repeatedly where (and only where) multiple declarations are 6412 // allowed. 6413 // 6414 // That's in non-member contexts. 6415 if (!CurContext->getRedeclContext()->isRecord()) 6416 return false; 6417 6418 NestedNameSpecifier *Qual 6419 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6420 6421 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6422 NamedDecl *D = *I; 6423 6424 bool DTypename; 6425 NestedNameSpecifier *DQual; 6426 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6427 DTypename = UD->isTypeName(); 6428 DQual = UD->getQualifier(); 6429 } else if (UnresolvedUsingValueDecl *UD 6430 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6431 DTypename = false; 6432 DQual = UD->getQualifier(); 6433 } else if (UnresolvedUsingTypenameDecl *UD 6434 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6435 DTypename = true; 6436 DQual = UD->getQualifier(); 6437 } else continue; 6438 6439 // using decls differ if one says 'typename' and the other doesn't. 6440 // FIXME: non-dependent using decls? 6441 if (isTypeName != DTypename) continue; 6442 6443 // using decls differ if they name different scopes (but note that 6444 // template instantiation can cause this check to trigger when it 6445 // didn't before instantiation). 6446 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6447 Context.getCanonicalNestedNameSpecifier(DQual)) 6448 continue; 6449 6450 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6451 Diag(D->getLocation(), diag::note_using_decl) << 1; 6452 return true; 6453 } 6454 6455 return false; 6456} 6457 6458 6459/// Checks that the given nested-name qualifier used in a using decl 6460/// in the current context is appropriately related to the current 6461/// scope. If an error is found, diagnoses it and returns true. 6462bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6463 const CXXScopeSpec &SS, 6464 SourceLocation NameLoc) { 6465 DeclContext *NamedContext = computeDeclContext(SS); 6466 6467 if (!CurContext->isRecord()) { 6468 // C++03 [namespace.udecl]p3: 6469 // C++0x [namespace.udecl]p8: 6470 // A using-declaration for a class member shall be a member-declaration. 6471 6472 // If we weren't able to compute a valid scope, it must be a 6473 // dependent class scope. 6474 if (!NamedContext || NamedContext->isRecord()) { 6475 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6476 << SS.getRange(); 6477 return true; 6478 } 6479 6480 // Otherwise, everything is known to be fine. 6481 return false; 6482 } 6483 6484 // The current scope is a record. 6485 6486 // If the named context is dependent, we can't decide much. 6487 if (!NamedContext) { 6488 // FIXME: in C++0x, we can diagnose if we can prove that the 6489 // nested-name-specifier does not refer to a base class, which is 6490 // still possible in some cases. 6491 6492 // Otherwise we have to conservatively report that things might be 6493 // okay. 6494 return false; 6495 } 6496 6497 if (!NamedContext->isRecord()) { 6498 // Ideally this would point at the last name in the specifier, 6499 // but we don't have that level of source info. 6500 Diag(SS.getRange().getBegin(), 6501 diag::err_using_decl_nested_name_specifier_is_not_class) 6502 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6503 return true; 6504 } 6505 6506 if (!NamedContext->isDependentContext() && 6507 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6508 return true; 6509 6510 if (getLangOpts().CPlusPlus0x) { 6511 // C++0x [namespace.udecl]p3: 6512 // In a using-declaration used as a member-declaration, the 6513 // nested-name-specifier shall name a base class of the class 6514 // being defined. 6515 6516 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6517 cast<CXXRecordDecl>(NamedContext))) { 6518 if (CurContext == NamedContext) { 6519 Diag(NameLoc, 6520 diag::err_using_decl_nested_name_specifier_is_current_class) 6521 << SS.getRange(); 6522 return true; 6523 } 6524 6525 Diag(SS.getRange().getBegin(), 6526 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6527 << (NestedNameSpecifier*) SS.getScopeRep() 6528 << cast<CXXRecordDecl>(CurContext) 6529 << SS.getRange(); 6530 return true; 6531 } 6532 6533 return false; 6534 } 6535 6536 // C++03 [namespace.udecl]p4: 6537 // A using-declaration used as a member-declaration shall refer 6538 // to a member of a base class of the class being defined [etc.]. 6539 6540 // Salient point: SS doesn't have to name a base class as long as 6541 // lookup only finds members from base classes. Therefore we can 6542 // diagnose here only if we can prove that that can't happen, 6543 // i.e. if the class hierarchies provably don't intersect. 6544 6545 // TODO: it would be nice if "definitely valid" results were cached 6546 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6547 // need to be repeated. 6548 6549 struct UserData { 6550 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 6551 6552 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6553 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6554 Data->Bases.insert(Base); 6555 return true; 6556 } 6557 6558 bool hasDependentBases(const CXXRecordDecl *Class) { 6559 return !Class->forallBases(collect, this); 6560 } 6561 6562 /// Returns true if the base is dependent or is one of the 6563 /// accumulated base classes. 6564 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6565 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6566 return !Data->Bases.count(Base); 6567 } 6568 6569 bool mightShareBases(const CXXRecordDecl *Class) { 6570 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6571 } 6572 }; 6573 6574 UserData Data; 6575 6576 // Returns false if we find a dependent base. 6577 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6578 return false; 6579 6580 // Returns false if the class has a dependent base or if it or one 6581 // of its bases is present in the base set of the current context. 6582 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6583 return false; 6584 6585 Diag(SS.getRange().getBegin(), 6586 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6587 << (NestedNameSpecifier*) SS.getScopeRep() 6588 << cast<CXXRecordDecl>(CurContext) 6589 << SS.getRange(); 6590 6591 return true; 6592} 6593 6594Decl *Sema::ActOnAliasDeclaration(Scope *S, 6595 AccessSpecifier AS, 6596 MultiTemplateParamsArg TemplateParamLists, 6597 SourceLocation UsingLoc, 6598 UnqualifiedId &Name, 6599 TypeResult Type) { 6600 // Skip up to the relevant declaration scope. 6601 while (S->getFlags() & Scope::TemplateParamScope) 6602 S = S->getParent(); 6603 assert((S->getFlags() & Scope::DeclScope) && 6604 "got alias-declaration outside of declaration scope"); 6605 6606 if (Type.isInvalid()) 6607 return 0; 6608 6609 bool Invalid = false; 6610 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6611 TypeSourceInfo *TInfo = 0; 6612 GetTypeFromParser(Type.get(), &TInfo); 6613 6614 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6615 return 0; 6616 6617 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6618 UPPC_DeclarationType)) { 6619 Invalid = true; 6620 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6621 TInfo->getTypeLoc().getBeginLoc()); 6622 } 6623 6624 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6625 LookupName(Previous, S); 6626 6627 // Warn about shadowing the name of a template parameter. 6628 if (Previous.isSingleResult() && 6629 Previous.getFoundDecl()->isTemplateParameter()) { 6630 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6631 Previous.clear(); 6632 } 6633 6634 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6635 "name in alias declaration must be an identifier"); 6636 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6637 Name.StartLocation, 6638 Name.Identifier, TInfo); 6639 6640 NewTD->setAccess(AS); 6641 6642 if (Invalid) 6643 NewTD->setInvalidDecl(); 6644 6645 CheckTypedefForVariablyModifiedType(S, NewTD); 6646 Invalid |= NewTD->isInvalidDecl(); 6647 6648 bool Redeclaration = false; 6649 6650 NamedDecl *NewND; 6651 if (TemplateParamLists.size()) { 6652 TypeAliasTemplateDecl *OldDecl = 0; 6653 TemplateParameterList *OldTemplateParams = 0; 6654 6655 if (TemplateParamLists.size() != 1) { 6656 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6657 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6658 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6659 } 6660 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6661 6662 // Only consider previous declarations in the same scope. 6663 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6664 /*ExplicitInstantiationOrSpecialization*/false); 6665 if (!Previous.empty()) { 6666 Redeclaration = true; 6667 6668 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6669 if (!OldDecl && !Invalid) { 6670 Diag(UsingLoc, diag::err_redefinition_different_kind) 6671 << Name.Identifier; 6672 6673 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6674 if (OldD->getLocation().isValid()) 6675 Diag(OldD->getLocation(), diag::note_previous_definition); 6676 6677 Invalid = true; 6678 } 6679 6680 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6681 if (TemplateParameterListsAreEqual(TemplateParams, 6682 OldDecl->getTemplateParameters(), 6683 /*Complain=*/true, 6684 TPL_TemplateMatch)) 6685 OldTemplateParams = OldDecl->getTemplateParameters(); 6686 else 6687 Invalid = true; 6688 6689 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6690 if (!Invalid && 6691 !Context.hasSameType(OldTD->getUnderlyingType(), 6692 NewTD->getUnderlyingType())) { 6693 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6694 // but we can't reasonably accept it. 6695 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6696 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6697 if (OldTD->getLocation().isValid()) 6698 Diag(OldTD->getLocation(), diag::note_previous_definition); 6699 Invalid = true; 6700 } 6701 } 6702 } 6703 6704 // Merge any previous default template arguments into our parameters, 6705 // and check the parameter list. 6706 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6707 TPC_TypeAliasTemplate)) 6708 return 0; 6709 6710 TypeAliasTemplateDecl *NewDecl = 6711 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6712 Name.Identifier, TemplateParams, 6713 NewTD); 6714 6715 NewDecl->setAccess(AS); 6716 6717 if (Invalid) 6718 NewDecl->setInvalidDecl(); 6719 else if (OldDecl) 6720 NewDecl->setPreviousDeclaration(OldDecl); 6721 6722 NewND = NewDecl; 6723 } else { 6724 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6725 NewND = NewTD; 6726 } 6727 6728 if (!Redeclaration) 6729 PushOnScopeChains(NewND, S); 6730 6731 return NewND; 6732} 6733 6734Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6735 SourceLocation NamespaceLoc, 6736 SourceLocation AliasLoc, 6737 IdentifierInfo *Alias, 6738 CXXScopeSpec &SS, 6739 SourceLocation IdentLoc, 6740 IdentifierInfo *Ident) { 6741 6742 // Lookup the namespace name. 6743 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6744 LookupParsedName(R, S, &SS); 6745 6746 // Check if we have a previous declaration with the same name. 6747 NamedDecl *PrevDecl 6748 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6749 ForRedeclaration); 6750 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6751 PrevDecl = 0; 6752 6753 if (PrevDecl) { 6754 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6755 // We already have an alias with the same name that points to the same 6756 // namespace, so don't create a new one. 6757 // FIXME: At some point, we'll want to create the (redundant) 6758 // declaration to maintain better source information. 6759 if (!R.isAmbiguous() && !R.empty() && 6760 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6761 return 0; 6762 } 6763 6764 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6765 diag::err_redefinition_different_kind; 6766 Diag(AliasLoc, DiagID) << Alias; 6767 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6768 return 0; 6769 } 6770 6771 if (R.isAmbiguous()) 6772 return 0; 6773 6774 if (R.empty()) { 6775 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6776 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6777 return 0; 6778 } 6779 } 6780 6781 NamespaceAliasDecl *AliasDecl = 6782 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6783 Alias, SS.getWithLocInContext(Context), 6784 IdentLoc, R.getFoundDecl()); 6785 6786 PushOnScopeChains(AliasDecl, S); 6787 return AliasDecl; 6788} 6789 6790namespace { 6791 /// \brief Scoped object used to handle the state changes required in Sema 6792 /// to implicitly define the body of a C++ member function; 6793 class ImplicitlyDefinedFunctionScope { 6794 Sema &S; 6795 Sema::ContextRAII SavedContext; 6796 6797 public: 6798 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6799 : S(S), SavedContext(S, Method) 6800 { 6801 S.PushFunctionScope(); 6802 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6803 } 6804 6805 ~ImplicitlyDefinedFunctionScope() { 6806 S.PopExpressionEvaluationContext(); 6807 S.PopFunctionScopeInfo(); 6808 } 6809 }; 6810} 6811 6812Sema::ImplicitExceptionSpecification 6813Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6814 // C++ [except.spec]p14: 6815 // An implicitly declared special member function (Clause 12) shall have an 6816 // exception-specification. [...] 6817 ImplicitExceptionSpecification ExceptSpec(Context); 6818 if (ClassDecl->isInvalidDecl()) 6819 return ExceptSpec; 6820 6821 // Direct base-class constructors. 6822 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6823 BEnd = ClassDecl->bases_end(); 6824 B != BEnd; ++B) { 6825 if (B->isVirtual()) // Handled below. 6826 continue; 6827 6828 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6829 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6830 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6831 // If this is a deleted function, add it anyway. This might be conformant 6832 // with the standard. This might not. I'm not sure. It might not matter. 6833 if (Constructor) 6834 ExceptSpec.CalledDecl(Constructor); 6835 } 6836 } 6837 6838 // Virtual base-class constructors. 6839 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6840 BEnd = ClassDecl->vbases_end(); 6841 B != BEnd; ++B) { 6842 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6843 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6844 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6845 // If this is a deleted function, add it anyway. This might be conformant 6846 // with the standard. This might not. I'm not sure. It might not matter. 6847 if (Constructor) 6848 ExceptSpec.CalledDecl(Constructor); 6849 } 6850 } 6851 6852 // Field constructors. 6853 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6854 FEnd = ClassDecl->field_end(); 6855 F != FEnd; ++F) { 6856 if (F->hasInClassInitializer()) { 6857 if (Expr *E = F->getInClassInitializer()) 6858 ExceptSpec.CalledExpr(E); 6859 else if (!F->isInvalidDecl()) 6860 ExceptSpec.SetDelayed(); 6861 } else if (const RecordType *RecordTy 6862 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6863 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6864 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6865 // If this is a deleted function, add it anyway. This might be conformant 6866 // with the standard. This might not. I'm not sure. It might not matter. 6867 // In particular, the problem is that this function never gets called. It 6868 // might just be ill-formed because this function attempts to refer to 6869 // a deleted function here. 6870 if (Constructor) 6871 ExceptSpec.CalledDecl(Constructor); 6872 } 6873 } 6874 6875 return ExceptSpec; 6876} 6877 6878CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6879 CXXRecordDecl *ClassDecl) { 6880 // C++ [class.ctor]p5: 6881 // A default constructor for a class X is a constructor of class X 6882 // that can be called without an argument. If there is no 6883 // user-declared constructor for class X, a default constructor is 6884 // implicitly declared. An implicitly-declared default constructor 6885 // is an inline public member of its class. 6886 assert(!ClassDecl->hasUserDeclaredConstructor() && 6887 "Should not build implicit default constructor!"); 6888 6889 ImplicitExceptionSpecification Spec = 6890 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6891 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6892 6893 // Create the actual constructor declaration. 6894 CanQualType ClassType 6895 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6896 SourceLocation ClassLoc = ClassDecl->getLocation(); 6897 DeclarationName Name 6898 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6899 DeclarationNameInfo NameInfo(Name, ClassLoc); 6900 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 6901 Context, ClassDecl, ClassLoc, NameInfo, 6902 Context.getFunctionType(Context.VoidTy, 0, 0, EPI), /*TInfo=*/0, 6903 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 6904 /*isConstexpr=*/ClassDecl->defaultedDefaultConstructorIsConstexpr() && 6905 getLangOpts().CPlusPlus0x); 6906 DefaultCon->setAccess(AS_public); 6907 DefaultCon->setDefaulted(); 6908 DefaultCon->setImplicit(); 6909 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6910 6911 // Note that we have declared this constructor. 6912 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6913 6914 if (Scope *S = getScopeForContext(ClassDecl)) 6915 PushOnScopeChains(DefaultCon, S, false); 6916 ClassDecl->addDecl(DefaultCon); 6917 6918 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6919 DefaultCon->setDeletedAsWritten(); 6920 6921 return DefaultCon; 6922} 6923 6924void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6925 CXXConstructorDecl *Constructor) { 6926 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6927 !Constructor->doesThisDeclarationHaveABody() && 6928 !Constructor->isDeleted()) && 6929 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6930 6931 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6932 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6933 6934 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6935 DiagnosticErrorTrap Trap(Diags); 6936 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6937 Trap.hasErrorOccurred()) { 6938 Diag(CurrentLocation, diag::note_member_synthesized_at) 6939 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6940 Constructor->setInvalidDecl(); 6941 return; 6942 } 6943 6944 SourceLocation Loc = Constructor->getLocation(); 6945 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6946 6947 Constructor->setUsed(); 6948 MarkVTableUsed(CurrentLocation, ClassDecl); 6949 6950 if (ASTMutationListener *L = getASTMutationListener()) { 6951 L->CompletedImplicitDefinition(Constructor); 6952 } 6953} 6954 6955/// Get any existing defaulted default constructor for the given class. Do not 6956/// implicitly define one if it does not exist. 6957static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6958 CXXRecordDecl *D) { 6959 ASTContext &Context = Self.Context; 6960 QualType ClassType = Context.getTypeDeclType(D); 6961 DeclarationName ConstructorName 6962 = Context.DeclarationNames.getCXXConstructorName( 6963 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6964 6965 DeclContext::lookup_const_iterator Con, ConEnd; 6966 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6967 Con != ConEnd; ++Con) { 6968 // A function template cannot be defaulted. 6969 if (isa<FunctionTemplateDecl>(*Con)) 6970 continue; 6971 6972 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6973 if (Constructor->isDefaultConstructor()) 6974 return Constructor->isDefaulted() ? Constructor : 0; 6975 } 6976 return 0; 6977} 6978 6979void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6980 if (!D) return; 6981 AdjustDeclIfTemplate(D); 6982 6983 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6984 CXXConstructorDecl *CtorDecl 6985 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6986 6987 if (!CtorDecl) return; 6988 6989 // Compute the exception specification for the default constructor. 6990 const FunctionProtoType *CtorTy = 6991 CtorDecl->getType()->castAs<FunctionProtoType>(); 6992 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6993 ImplicitExceptionSpecification Spec = 6994 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6995 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6996 assert(EPI.ExceptionSpecType != EST_Delayed); 6997 6998 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6999 } 7000 7001 // If the default constructor is explicitly defaulted, checking the exception 7002 // specification is deferred until now. 7003 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 7004 !ClassDecl->isDependentType()) 7005 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 7006} 7007 7008void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 7009 // We start with an initial pass over the base classes to collect those that 7010 // inherit constructors from. If there are none, we can forgo all further 7011 // processing. 7012 typedef SmallVector<const RecordType *, 4> BasesVector; 7013 BasesVector BasesToInheritFrom; 7014 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 7015 BaseE = ClassDecl->bases_end(); 7016 BaseIt != BaseE; ++BaseIt) { 7017 if (BaseIt->getInheritConstructors()) { 7018 QualType Base = BaseIt->getType(); 7019 if (Base->isDependentType()) { 7020 // If we inherit constructors from anything that is dependent, just 7021 // abort processing altogether. We'll get another chance for the 7022 // instantiations. 7023 return; 7024 } 7025 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 7026 } 7027 } 7028 if (BasesToInheritFrom.empty()) 7029 return; 7030 7031 // Now collect the constructors that we already have in the current class. 7032 // Those take precedence over inherited constructors. 7033 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 7034 // unless there is a user-declared constructor with the same signature in 7035 // the class where the using-declaration appears. 7036 llvm::SmallSet<const Type *, 8> ExistingConstructors; 7037 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 7038 CtorE = ClassDecl->ctor_end(); 7039 CtorIt != CtorE; ++CtorIt) { 7040 ExistingConstructors.insert( 7041 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 7042 } 7043 7044 DeclarationName CreatedCtorName = 7045 Context.DeclarationNames.getCXXConstructorName( 7046 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 7047 7048 // Now comes the true work. 7049 // First, we keep a map from constructor types to the base that introduced 7050 // them. Needed for finding conflicting constructors. We also keep the 7051 // actually inserted declarations in there, for pretty diagnostics. 7052 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 7053 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 7054 ConstructorToSourceMap InheritedConstructors; 7055 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 7056 BaseE = BasesToInheritFrom.end(); 7057 BaseIt != BaseE; ++BaseIt) { 7058 const RecordType *Base = *BaseIt; 7059 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 7060 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 7061 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 7062 CtorE = BaseDecl->ctor_end(); 7063 CtorIt != CtorE; ++CtorIt) { 7064 // Find the using declaration for inheriting this base's constructors. 7065 // FIXME: Don't perform name lookup just to obtain a source location! 7066 DeclarationName Name = 7067 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 7068 LookupResult Result(*this, Name, SourceLocation(), LookupUsingDeclName); 7069 LookupQualifiedName(Result, CurContext); 7070 UsingDecl *UD = Result.getAsSingle<UsingDecl>(); 7071 SourceLocation UsingLoc = UD ? UD->getLocation() : 7072 ClassDecl->getLocation(); 7073 7074 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 7075 // from the class X named in the using-declaration consists of actual 7076 // constructors and notional constructors that result from the 7077 // transformation of defaulted parameters as follows: 7078 // - all non-template default constructors of X, and 7079 // - for each non-template constructor of X that has at least one 7080 // parameter with a default argument, the set of constructors that 7081 // results from omitting any ellipsis parameter specification and 7082 // successively omitting parameters with a default argument from the 7083 // end of the parameter-type-list. 7084 CXXConstructorDecl *BaseCtor = *CtorIt; 7085 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 7086 const FunctionProtoType *BaseCtorType = 7087 BaseCtor->getType()->getAs<FunctionProtoType>(); 7088 7089 for (unsigned params = BaseCtor->getMinRequiredArguments(), 7090 maxParams = BaseCtor->getNumParams(); 7091 params <= maxParams; ++params) { 7092 // Skip default constructors. They're never inherited. 7093 if (params == 0) 7094 continue; 7095 // Skip copy and move constructors for the same reason. 7096 if (CanBeCopyOrMove && params == 1) 7097 continue; 7098 7099 // Build up a function type for this particular constructor. 7100 // FIXME: The working paper does not consider that the exception spec 7101 // for the inheriting constructor might be larger than that of the 7102 // source. This code doesn't yet, either. When it does, this code will 7103 // need to be delayed until after exception specifications and in-class 7104 // member initializers are attached. 7105 const Type *NewCtorType; 7106 if (params == maxParams) 7107 NewCtorType = BaseCtorType; 7108 else { 7109 SmallVector<QualType, 16> Args; 7110 for (unsigned i = 0; i < params; ++i) { 7111 Args.push_back(BaseCtorType->getArgType(i)); 7112 } 7113 FunctionProtoType::ExtProtoInfo ExtInfo = 7114 BaseCtorType->getExtProtoInfo(); 7115 ExtInfo.Variadic = false; 7116 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7117 Args.data(), params, ExtInfo) 7118 .getTypePtr(); 7119 } 7120 const Type *CanonicalNewCtorType = 7121 Context.getCanonicalType(NewCtorType); 7122 7123 // Now that we have the type, first check if the class already has a 7124 // constructor with this signature. 7125 if (ExistingConstructors.count(CanonicalNewCtorType)) 7126 continue; 7127 7128 // Then we check if we have already declared an inherited constructor 7129 // with this signature. 7130 std::pair<ConstructorToSourceMap::iterator, bool> result = 7131 InheritedConstructors.insert(std::make_pair( 7132 CanonicalNewCtorType, 7133 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7134 if (!result.second) { 7135 // Already in the map. If it came from a different class, that's an 7136 // error. Not if it's from the same. 7137 CanQualType PreviousBase = result.first->second.first; 7138 if (CanonicalBase != PreviousBase) { 7139 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7140 const CXXConstructorDecl *PrevBaseCtor = 7141 PrevCtor->getInheritedConstructor(); 7142 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7143 7144 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7145 Diag(BaseCtor->getLocation(), 7146 diag::note_using_decl_constructor_conflict_current_ctor); 7147 Diag(PrevBaseCtor->getLocation(), 7148 diag::note_using_decl_constructor_conflict_previous_ctor); 7149 Diag(PrevCtor->getLocation(), 7150 diag::note_using_decl_constructor_conflict_previous_using); 7151 } 7152 continue; 7153 } 7154 7155 // OK, we're there, now add the constructor. 7156 // C++0x [class.inhctor]p8: [...] that would be performed by a 7157 // user-written inline constructor [...] 7158 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7159 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7160 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7161 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7162 /*ImplicitlyDeclared=*/true, 7163 // FIXME: Due to a defect in the standard, we treat inherited 7164 // constructors as constexpr even if that makes them ill-formed. 7165 /*Constexpr=*/BaseCtor->isConstexpr()); 7166 NewCtor->setAccess(BaseCtor->getAccess()); 7167 7168 // Build up the parameter decls and add them. 7169 SmallVector<ParmVarDecl *, 16> ParamDecls; 7170 for (unsigned i = 0; i < params; ++i) { 7171 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7172 UsingLoc, UsingLoc, 7173 /*IdentifierInfo=*/0, 7174 BaseCtorType->getArgType(i), 7175 /*TInfo=*/0, SC_None, 7176 SC_None, /*DefaultArg=*/0)); 7177 } 7178 NewCtor->setParams(ParamDecls); 7179 NewCtor->setInheritedConstructor(BaseCtor); 7180 7181 ClassDecl->addDecl(NewCtor); 7182 result.first->second.second = NewCtor; 7183 } 7184 } 7185 } 7186} 7187 7188Sema::ImplicitExceptionSpecification 7189Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7190 // C++ [except.spec]p14: 7191 // An implicitly declared special member function (Clause 12) shall have 7192 // an exception-specification. 7193 ImplicitExceptionSpecification ExceptSpec(Context); 7194 if (ClassDecl->isInvalidDecl()) 7195 return ExceptSpec; 7196 7197 // Direct base-class destructors. 7198 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7199 BEnd = ClassDecl->bases_end(); 7200 B != BEnd; ++B) { 7201 if (B->isVirtual()) // Handled below. 7202 continue; 7203 7204 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7205 ExceptSpec.CalledDecl( 7206 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7207 } 7208 7209 // Virtual base-class destructors. 7210 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7211 BEnd = ClassDecl->vbases_end(); 7212 B != BEnd; ++B) { 7213 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7214 ExceptSpec.CalledDecl( 7215 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7216 } 7217 7218 // Field destructors. 7219 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7220 FEnd = ClassDecl->field_end(); 7221 F != FEnd; ++F) { 7222 if (const RecordType *RecordTy 7223 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7224 ExceptSpec.CalledDecl( 7225 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7226 } 7227 7228 return ExceptSpec; 7229} 7230 7231CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7232 // C++ [class.dtor]p2: 7233 // If a class has no user-declared destructor, a destructor is 7234 // declared implicitly. An implicitly-declared destructor is an 7235 // inline public member of its class. 7236 7237 ImplicitExceptionSpecification Spec = 7238 ComputeDefaultedDtorExceptionSpec(ClassDecl); 7239 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7240 7241 // Create the actual destructor declaration. 7242 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 7243 7244 CanQualType ClassType 7245 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7246 SourceLocation ClassLoc = ClassDecl->getLocation(); 7247 DeclarationName Name 7248 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7249 DeclarationNameInfo NameInfo(Name, ClassLoc); 7250 CXXDestructorDecl *Destructor 7251 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 7252 /*isInline=*/true, 7253 /*isImplicitlyDeclared=*/true); 7254 Destructor->setAccess(AS_public); 7255 Destructor->setDefaulted(); 7256 Destructor->setImplicit(); 7257 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7258 7259 // Note that we have declared this destructor. 7260 ++ASTContext::NumImplicitDestructorsDeclared; 7261 7262 // Introduce this destructor into its scope. 7263 if (Scope *S = getScopeForContext(ClassDecl)) 7264 PushOnScopeChains(Destructor, S, false); 7265 ClassDecl->addDecl(Destructor); 7266 7267 // This could be uniqued if it ever proves significant. 7268 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 7269 7270 AddOverriddenMethods(ClassDecl, Destructor); 7271 7272 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 7273 Destructor->setDeletedAsWritten(); 7274 7275 return Destructor; 7276} 7277 7278void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7279 CXXDestructorDecl *Destructor) { 7280 assert((Destructor->isDefaulted() && 7281 !Destructor->doesThisDeclarationHaveABody() && 7282 !Destructor->isDeleted()) && 7283 "DefineImplicitDestructor - call it for implicit default dtor"); 7284 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7285 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7286 7287 if (Destructor->isInvalidDecl()) 7288 return; 7289 7290 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7291 7292 DiagnosticErrorTrap Trap(Diags); 7293 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7294 Destructor->getParent()); 7295 7296 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7297 Diag(CurrentLocation, diag::note_member_synthesized_at) 7298 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7299 7300 Destructor->setInvalidDecl(); 7301 return; 7302 } 7303 7304 SourceLocation Loc = Destructor->getLocation(); 7305 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7306 Destructor->setImplicitlyDefined(true); 7307 Destructor->setUsed(); 7308 MarkVTableUsed(CurrentLocation, ClassDecl); 7309 7310 if (ASTMutationListener *L = getASTMutationListener()) { 7311 L->CompletedImplicitDefinition(Destructor); 7312 } 7313} 7314 7315void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 7316 CXXDestructorDecl *destructor) { 7317 // C++11 [class.dtor]p3: 7318 // A declaration of a destructor that does not have an exception- 7319 // specification is implicitly considered to have the same exception- 7320 // specification as an implicit declaration. 7321 const FunctionProtoType *dtorType = destructor->getType()-> 7322 getAs<FunctionProtoType>(); 7323 if (dtorType->hasExceptionSpec()) 7324 return; 7325 7326 ImplicitExceptionSpecification exceptSpec = 7327 ComputeDefaultedDtorExceptionSpec(classDecl); 7328 7329 // Replace the destructor's type, building off the existing one. Fortunately, 7330 // the only thing of interest in the destructor type is its extended info. 7331 // The return and arguments are fixed. 7332 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 7333 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 7334 epi.NumExceptions = exceptSpec.size(); 7335 epi.Exceptions = exceptSpec.data(); 7336 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 7337 7338 destructor->setType(ty); 7339 7340 // FIXME: If the destructor has a body that could throw, and the newly created 7341 // spec doesn't allow exceptions, we should emit a warning, because this 7342 // change in behavior can break conforming C++03 programs at runtime. 7343 // However, we don't have a body yet, so it needs to be done somewhere else. 7344} 7345 7346/// \brief Builds a statement that copies/moves the given entity from \p From to 7347/// \c To. 7348/// 7349/// This routine is used to copy/move the members of a class with an 7350/// implicitly-declared copy/move assignment operator. When the entities being 7351/// copied are arrays, this routine builds for loops to copy them. 7352/// 7353/// \param S The Sema object used for type-checking. 7354/// 7355/// \param Loc The location where the implicit copy/move is being generated. 7356/// 7357/// \param T The type of the expressions being copied/moved. Both expressions 7358/// must have this type. 7359/// 7360/// \param To The expression we are copying/moving to. 7361/// 7362/// \param From The expression we are copying/moving from. 7363/// 7364/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7365/// Otherwise, it's a non-static member subobject. 7366/// 7367/// \param Copying Whether we're copying or moving. 7368/// 7369/// \param Depth Internal parameter recording the depth of the recursion. 7370/// 7371/// \returns A statement or a loop that copies the expressions. 7372static StmtResult 7373BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7374 Expr *To, Expr *From, 7375 bool CopyingBaseSubobject, bool Copying, 7376 unsigned Depth = 0) { 7377 // C++0x [class.copy]p28: 7378 // Each subobject is assigned in the manner appropriate to its type: 7379 // 7380 // - if the subobject is of class type, as if by a call to operator= with 7381 // the subobject as the object expression and the corresponding 7382 // subobject of x as a single function argument (as if by explicit 7383 // qualification; that is, ignoring any possible virtual overriding 7384 // functions in more derived classes); 7385 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7386 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7387 7388 // Look for operator=. 7389 DeclarationName Name 7390 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7391 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7392 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7393 7394 // Filter out any result that isn't a copy/move-assignment operator. 7395 LookupResult::Filter F = OpLookup.makeFilter(); 7396 while (F.hasNext()) { 7397 NamedDecl *D = F.next(); 7398 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7399 if (Method->isCopyAssignmentOperator() || 7400 (!Copying && Method->isMoveAssignmentOperator())) 7401 continue; 7402 7403 F.erase(); 7404 } 7405 F.done(); 7406 7407 // Suppress the protected check (C++ [class.protected]) for each of the 7408 // assignment operators we found. This strange dance is required when 7409 // we're assigning via a base classes's copy-assignment operator. To 7410 // ensure that we're getting the right base class subobject (without 7411 // ambiguities), we need to cast "this" to that subobject type; to 7412 // ensure that we don't go through the virtual call mechanism, we need 7413 // to qualify the operator= name with the base class (see below). However, 7414 // this means that if the base class has a protected copy assignment 7415 // operator, the protected member access check will fail. So, we 7416 // rewrite "protected" access to "public" access in this case, since we 7417 // know by construction that we're calling from a derived class. 7418 if (CopyingBaseSubobject) { 7419 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7420 L != LEnd; ++L) { 7421 if (L.getAccess() == AS_protected) 7422 L.setAccess(AS_public); 7423 } 7424 } 7425 7426 // Create the nested-name-specifier that will be used to qualify the 7427 // reference to operator=; this is required to suppress the virtual 7428 // call mechanism. 7429 CXXScopeSpec SS; 7430 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 7431 SS.MakeTrivial(S.Context, 7432 NestedNameSpecifier::Create(S.Context, 0, false, 7433 CanonicalT), 7434 Loc); 7435 7436 // Create the reference to operator=. 7437 ExprResult OpEqualRef 7438 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7439 /*TemplateKWLoc=*/SourceLocation(), 7440 /*FirstQualifierInScope=*/0, 7441 OpLookup, 7442 /*TemplateArgs=*/0, 7443 /*SuppressQualifierCheck=*/true); 7444 if (OpEqualRef.isInvalid()) 7445 return StmtError(); 7446 7447 // Build the call to the assignment operator. 7448 7449 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7450 OpEqualRef.takeAs<Expr>(), 7451 Loc, &From, 1, Loc); 7452 if (Call.isInvalid()) 7453 return StmtError(); 7454 7455 return S.Owned(Call.takeAs<Stmt>()); 7456 } 7457 7458 // - if the subobject is of scalar type, the built-in assignment 7459 // operator is used. 7460 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7461 if (!ArrayTy) { 7462 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7463 if (Assignment.isInvalid()) 7464 return StmtError(); 7465 7466 return S.Owned(Assignment.takeAs<Stmt>()); 7467 } 7468 7469 // - if the subobject is an array, each element is assigned, in the 7470 // manner appropriate to the element type; 7471 7472 // Construct a loop over the array bounds, e.g., 7473 // 7474 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7475 // 7476 // that will copy each of the array elements. 7477 QualType SizeType = S.Context.getSizeType(); 7478 7479 // Create the iteration variable. 7480 IdentifierInfo *IterationVarName = 0; 7481 { 7482 SmallString<8> Str; 7483 llvm::raw_svector_ostream OS(Str); 7484 OS << "__i" << Depth; 7485 IterationVarName = &S.Context.Idents.get(OS.str()); 7486 } 7487 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7488 IterationVarName, SizeType, 7489 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7490 SC_None, SC_None); 7491 7492 // Initialize the iteration variable to zero. 7493 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7494 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7495 7496 // Create a reference to the iteration variable; we'll use this several 7497 // times throughout. 7498 Expr *IterationVarRef 7499 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 7500 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7501 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 7502 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 7503 7504 // Create the DeclStmt that holds the iteration variable. 7505 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7506 7507 // Create the comparison against the array bound. 7508 llvm::APInt Upper 7509 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7510 Expr *Comparison 7511 = new (S.Context) BinaryOperator(IterationVarRefRVal, 7512 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7513 BO_NE, S.Context.BoolTy, 7514 VK_RValue, OK_Ordinary, Loc); 7515 7516 // Create the pre-increment of the iteration variable. 7517 Expr *Increment 7518 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7519 VK_LValue, OK_Ordinary, Loc); 7520 7521 // Subscript the "from" and "to" expressions with the iteration variable. 7522 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7523 IterationVarRefRVal, 7524 Loc)); 7525 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7526 IterationVarRefRVal, 7527 Loc)); 7528 if (!Copying) // Cast to rvalue 7529 From = CastForMoving(S, From); 7530 7531 // Build the copy/move for an individual element of the array. 7532 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7533 To, From, CopyingBaseSubobject, 7534 Copying, Depth + 1); 7535 if (Copy.isInvalid()) 7536 return StmtError(); 7537 7538 // Construct the loop that copies all elements of this array. 7539 return S.ActOnForStmt(Loc, Loc, InitStmt, 7540 S.MakeFullExpr(Comparison), 7541 0, S.MakeFullExpr(Increment), 7542 Loc, Copy.take()); 7543} 7544 7545std::pair<Sema::ImplicitExceptionSpecification, bool> 7546Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7547 CXXRecordDecl *ClassDecl) { 7548 if (ClassDecl->isInvalidDecl()) 7549 return std::make_pair(ImplicitExceptionSpecification(Context), false); 7550 7551 // C++ [class.copy]p10: 7552 // If the class definition does not explicitly declare a copy 7553 // assignment operator, one is declared implicitly. 7554 // The implicitly-defined copy assignment operator for a class X 7555 // will have the form 7556 // 7557 // X& X::operator=(const X&) 7558 // 7559 // if 7560 bool HasConstCopyAssignment = true; 7561 7562 // -- each direct base class B of X has a copy assignment operator 7563 // whose parameter is of type const B&, const volatile B& or B, 7564 // and 7565 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7566 BaseEnd = ClassDecl->bases_end(); 7567 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7568 // We'll handle this below 7569 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7570 continue; 7571 7572 assert(!Base->getType()->isDependentType() && 7573 "Cannot generate implicit members for class with dependent bases."); 7574 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7575 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7576 &HasConstCopyAssignment); 7577 } 7578 7579 // In C++11, the above citation has "or virtual" added 7580 if (LangOpts.CPlusPlus0x) { 7581 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7582 BaseEnd = ClassDecl->vbases_end(); 7583 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7584 assert(!Base->getType()->isDependentType() && 7585 "Cannot generate implicit members for class with dependent bases."); 7586 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7587 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7588 &HasConstCopyAssignment); 7589 } 7590 } 7591 7592 // -- for all the nonstatic data members of X that are of a class 7593 // type M (or array thereof), each such class type has a copy 7594 // assignment operator whose parameter is of type const M&, 7595 // const volatile M& or M. 7596 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7597 FieldEnd = ClassDecl->field_end(); 7598 HasConstCopyAssignment && Field != FieldEnd; 7599 ++Field) { 7600 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7601 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7602 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 7603 &HasConstCopyAssignment); 7604 } 7605 } 7606 7607 // Otherwise, the implicitly declared copy assignment operator will 7608 // have the form 7609 // 7610 // X& X::operator=(X&) 7611 7612 // C++ [except.spec]p14: 7613 // An implicitly declared special member function (Clause 12) shall have an 7614 // exception-specification. [...] 7615 7616 // It is unspecified whether or not an implicit copy assignment operator 7617 // attempts to deduplicate calls to assignment operators of virtual bases are 7618 // made. As such, this exception specification is effectively unspecified. 7619 // Based on a similar decision made for constness in C++0x, we're erring on 7620 // the side of assuming such calls to be made regardless of whether they 7621 // actually happen. 7622 ImplicitExceptionSpecification ExceptSpec(Context); 7623 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7624 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7625 BaseEnd = ClassDecl->bases_end(); 7626 Base != BaseEnd; ++Base) { 7627 if (Base->isVirtual()) 7628 continue; 7629 7630 CXXRecordDecl *BaseClassDecl 7631 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7632 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7633 ArgQuals, false, 0)) 7634 ExceptSpec.CalledDecl(CopyAssign); 7635 } 7636 7637 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7638 BaseEnd = ClassDecl->vbases_end(); 7639 Base != BaseEnd; ++Base) { 7640 CXXRecordDecl *BaseClassDecl 7641 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7642 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7643 ArgQuals, false, 0)) 7644 ExceptSpec.CalledDecl(CopyAssign); 7645 } 7646 7647 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7648 FieldEnd = ClassDecl->field_end(); 7649 Field != FieldEnd; 7650 ++Field) { 7651 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7652 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7653 if (CXXMethodDecl *CopyAssign = 7654 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7655 ExceptSpec.CalledDecl(CopyAssign); 7656 } 7657 } 7658 7659 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7660} 7661 7662CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7663 // Note: The following rules are largely analoguous to the copy 7664 // constructor rules. Note that virtual bases are not taken into account 7665 // for determining the argument type of the operator. Note also that 7666 // operators taking an object instead of a reference are allowed. 7667 7668 ImplicitExceptionSpecification Spec(Context); 7669 bool Const; 7670 llvm::tie(Spec, Const) = 7671 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7672 7673 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7674 QualType RetType = Context.getLValueReferenceType(ArgType); 7675 if (Const) 7676 ArgType = ArgType.withConst(); 7677 ArgType = Context.getLValueReferenceType(ArgType); 7678 7679 // An implicitly-declared copy assignment operator is an inline public 7680 // member of its class. 7681 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7682 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7683 SourceLocation ClassLoc = ClassDecl->getLocation(); 7684 DeclarationNameInfo NameInfo(Name, ClassLoc); 7685 CXXMethodDecl *CopyAssignment 7686 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7687 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7688 /*TInfo=*/0, /*isStatic=*/false, 7689 /*StorageClassAsWritten=*/SC_None, 7690 /*isInline=*/true, /*isConstexpr=*/false, 7691 SourceLocation()); 7692 CopyAssignment->setAccess(AS_public); 7693 CopyAssignment->setDefaulted(); 7694 CopyAssignment->setImplicit(); 7695 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7696 7697 // Add the parameter to the operator. 7698 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7699 ClassLoc, ClassLoc, /*Id=*/0, 7700 ArgType, /*TInfo=*/0, 7701 SC_None, 7702 SC_None, 0); 7703 CopyAssignment->setParams(FromParam); 7704 7705 // Note that we have added this copy-assignment operator. 7706 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7707 7708 if (Scope *S = getScopeForContext(ClassDecl)) 7709 PushOnScopeChains(CopyAssignment, S, false); 7710 ClassDecl->addDecl(CopyAssignment); 7711 7712 // C++0x [class.copy]p19: 7713 // .... If the class definition does not explicitly declare a copy 7714 // assignment operator, there is no user-declared move constructor, and 7715 // there is no user-declared move assignment operator, a copy assignment 7716 // operator is implicitly declared as defaulted. 7717 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 7718 CopyAssignment->setDeletedAsWritten(); 7719 7720 AddOverriddenMethods(ClassDecl, CopyAssignment); 7721 return CopyAssignment; 7722} 7723 7724void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7725 CXXMethodDecl *CopyAssignOperator) { 7726 assert((CopyAssignOperator->isDefaulted() && 7727 CopyAssignOperator->isOverloadedOperator() && 7728 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7729 !CopyAssignOperator->doesThisDeclarationHaveABody() && 7730 !CopyAssignOperator->isDeleted()) && 7731 "DefineImplicitCopyAssignment called for wrong function"); 7732 7733 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7734 7735 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7736 CopyAssignOperator->setInvalidDecl(); 7737 return; 7738 } 7739 7740 CopyAssignOperator->setUsed(); 7741 7742 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7743 DiagnosticErrorTrap Trap(Diags); 7744 7745 // C++0x [class.copy]p30: 7746 // The implicitly-defined or explicitly-defaulted copy assignment operator 7747 // for a non-union class X performs memberwise copy assignment of its 7748 // subobjects. The direct base classes of X are assigned first, in the 7749 // order of their declaration in the base-specifier-list, and then the 7750 // immediate non-static data members of X are assigned, in the order in 7751 // which they were declared in the class definition. 7752 7753 // The statements that form the synthesized function body. 7754 ASTOwningVector<Stmt*> Statements(*this); 7755 7756 // The parameter for the "other" object, which we are copying from. 7757 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7758 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7759 QualType OtherRefType = Other->getType(); 7760 if (const LValueReferenceType *OtherRef 7761 = OtherRefType->getAs<LValueReferenceType>()) { 7762 OtherRefType = OtherRef->getPointeeType(); 7763 OtherQuals = OtherRefType.getQualifiers(); 7764 } 7765 7766 // Our location for everything implicitly-generated. 7767 SourceLocation Loc = CopyAssignOperator->getLocation(); 7768 7769 // Construct a reference to the "other" object. We'll be using this 7770 // throughout the generated ASTs. 7771 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7772 assert(OtherRef && "Reference to parameter cannot fail!"); 7773 7774 // Construct the "this" pointer. We'll be using this throughout the generated 7775 // ASTs. 7776 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7777 assert(This && "Reference to this cannot fail!"); 7778 7779 // Assign base classes. 7780 bool Invalid = false; 7781 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7782 E = ClassDecl->bases_end(); Base != E; ++Base) { 7783 // Form the assignment: 7784 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7785 QualType BaseType = Base->getType().getUnqualifiedType(); 7786 if (!BaseType->isRecordType()) { 7787 Invalid = true; 7788 continue; 7789 } 7790 7791 CXXCastPath BasePath; 7792 BasePath.push_back(Base); 7793 7794 // Construct the "from" expression, which is an implicit cast to the 7795 // appropriately-qualified base type. 7796 Expr *From = OtherRef; 7797 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7798 CK_UncheckedDerivedToBase, 7799 VK_LValue, &BasePath).take(); 7800 7801 // Dereference "this". 7802 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7803 7804 // Implicitly cast "this" to the appropriately-qualified base type. 7805 To = ImpCastExprToType(To.take(), 7806 Context.getCVRQualifiedType(BaseType, 7807 CopyAssignOperator->getTypeQualifiers()), 7808 CK_UncheckedDerivedToBase, 7809 VK_LValue, &BasePath); 7810 7811 // Build the copy. 7812 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7813 To.get(), From, 7814 /*CopyingBaseSubobject=*/true, 7815 /*Copying=*/true); 7816 if (Copy.isInvalid()) { 7817 Diag(CurrentLocation, diag::note_member_synthesized_at) 7818 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7819 CopyAssignOperator->setInvalidDecl(); 7820 return; 7821 } 7822 7823 // Success! Record the copy. 7824 Statements.push_back(Copy.takeAs<Expr>()); 7825 } 7826 7827 // \brief Reference to the __builtin_memcpy function. 7828 Expr *BuiltinMemCpyRef = 0; 7829 // \brief Reference to the __builtin_objc_memmove_collectable function. 7830 Expr *CollectableMemCpyRef = 0; 7831 7832 // Assign non-static members. 7833 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7834 FieldEnd = ClassDecl->field_end(); 7835 Field != FieldEnd; ++Field) { 7836 if (Field->isUnnamedBitfield()) 7837 continue; 7838 7839 // Check for members of reference type; we can't copy those. 7840 if (Field->getType()->isReferenceType()) { 7841 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7842 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7843 Diag(Field->getLocation(), diag::note_declared_at); 7844 Diag(CurrentLocation, diag::note_member_synthesized_at) 7845 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7846 Invalid = true; 7847 continue; 7848 } 7849 7850 // Check for members of const-qualified, non-class type. 7851 QualType BaseType = Context.getBaseElementType(Field->getType()); 7852 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7853 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7854 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7855 Diag(Field->getLocation(), diag::note_declared_at); 7856 Diag(CurrentLocation, diag::note_member_synthesized_at) 7857 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7858 Invalid = true; 7859 continue; 7860 } 7861 7862 // Suppress assigning zero-width bitfields. 7863 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7864 continue; 7865 7866 QualType FieldType = Field->getType().getNonReferenceType(); 7867 if (FieldType->isIncompleteArrayType()) { 7868 assert(ClassDecl->hasFlexibleArrayMember() && 7869 "Incomplete array type is not valid"); 7870 continue; 7871 } 7872 7873 // Build references to the field in the object we're copying from and to. 7874 CXXScopeSpec SS; // Intentionally empty 7875 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7876 LookupMemberName); 7877 MemberLookup.addDecl(*Field); 7878 MemberLookup.resolveKind(); 7879 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7880 Loc, /*IsArrow=*/false, 7881 SS, SourceLocation(), 0, 7882 MemberLookup, 0); 7883 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7884 Loc, /*IsArrow=*/true, 7885 SS, SourceLocation(), 0, 7886 MemberLookup, 0); 7887 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7888 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7889 7890 // If the field should be copied with __builtin_memcpy rather than via 7891 // explicit assignments, do so. This optimization only applies for arrays 7892 // of scalars and arrays of class type with trivial copy-assignment 7893 // operators. 7894 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7895 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7896 // Compute the size of the memory buffer to be copied. 7897 QualType SizeType = Context.getSizeType(); 7898 llvm::APInt Size(Context.getTypeSize(SizeType), 7899 Context.getTypeSizeInChars(BaseType).getQuantity()); 7900 for (const ConstantArrayType *Array 7901 = Context.getAsConstantArrayType(FieldType); 7902 Array; 7903 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7904 llvm::APInt ArraySize 7905 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7906 Size *= ArraySize; 7907 } 7908 7909 // Take the address of the field references for "from" and "to". 7910 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7911 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7912 7913 bool NeedsCollectableMemCpy = 7914 (BaseType->isRecordType() && 7915 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7916 7917 if (NeedsCollectableMemCpy) { 7918 if (!CollectableMemCpyRef) { 7919 // Create a reference to the __builtin_objc_memmove_collectable function. 7920 LookupResult R(*this, 7921 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7922 Loc, LookupOrdinaryName); 7923 LookupName(R, TUScope, true); 7924 7925 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7926 if (!CollectableMemCpy) { 7927 // Something went horribly wrong earlier, and we will have 7928 // complained about it. 7929 Invalid = true; 7930 continue; 7931 } 7932 7933 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7934 CollectableMemCpy->getType(), 7935 VK_LValue, Loc, 0).take(); 7936 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7937 } 7938 } 7939 // Create a reference to the __builtin_memcpy builtin function. 7940 else if (!BuiltinMemCpyRef) { 7941 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7942 LookupOrdinaryName); 7943 LookupName(R, TUScope, true); 7944 7945 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7946 if (!BuiltinMemCpy) { 7947 // Something went horribly wrong earlier, and we will have complained 7948 // about it. 7949 Invalid = true; 7950 continue; 7951 } 7952 7953 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7954 BuiltinMemCpy->getType(), 7955 VK_LValue, Loc, 0).take(); 7956 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7957 } 7958 7959 ASTOwningVector<Expr*> CallArgs(*this); 7960 CallArgs.push_back(To.takeAs<Expr>()); 7961 CallArgs.push_back(From.takeAs<Expr>()); 7962 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7963 ExprResult Call = ExprError(); 7964 if (NeedsCollectableMemCpy) 7965 Call = ActOnCallExpr(/*Scope=*/0, 7966 CollectableMemCpyRef, 7967 Loc, move_arg(CallArgs), 7968 Loc); 7969 else 7970 Call = ActOnCallExpr(/*Scope=*/0, 7971 BuiltinMemCpyRef, 7972 Loc, move_arg(CallArgs), 7973 Loc); 7974 7975 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7976 Statements.push_back(Call.takeAs<Expr>()); 7977 continue; 7978 } 7979 7980 // Build the copy of this field. 7981 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7982 To.get(), From.get(), 7983 /*CopyingBaseSubobject=*/false, 7984 /*Copying=*/true); 7985 if (Copy.isInvalid()) { 7986 Diag(CurrentLocation, diag::note_member_synthesized_at) 7987 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7988 CopyAssignOperator->setInvalidDecl(); 7989 return; 7990 } 7991 7992 // Success! Record the copy. 7993 Statements.push_back(Copy.takeAs<Stmt>()); 7994 } 7995 7996 if (!Invalid) { 7997 // Add a "return *this;" 7998 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7999 8000 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8001 if (Return.isInvalid()) 8002 Invalid = true; 8003 else { 8004 Statements.push_back(Return.takeAs<Stmt>()); 8005 8006 if (Trap.hasErrorOccurred()) { 8007 Diag(CurrentLocation, diag::note_member_synthesized_at) 8008 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8009 Invalid = true; 8010 } 8011 } 8012 } 8013 8014 if (Invalid) { 8015 CopyAssignOperator->setInvalidDecl(); 8016 return; 8017 } 8018 8019 StmtResult Body; 8020 { 8021 CompoundScopeRAII CompoundScope(*this); 8022 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8023 /*isStmtExpr=*/false); 8024 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8025 } 8026 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 8027 8028 if (ASTMutationListener *L = getASTMutationListener()) { 8029 L->CompletedImplicitDefinition(CopyAssignOperator); 8030 } 8031} 8032 8033Sema::ImplicitExceptionSpecification 8034Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 8035 ImplicitExceptionSpecification ExceptSpec(Context); 8036 8037 if (ClassDecl->isInvalidDecl()) 8038 return ExceptSpec; 8039 8040 // C++0x [except.spec]p14: 8041 // An implicitly declared special member function (Clause 12) shall have an 8042 // exception-specification. [...] 8043 8044 // It is unspecified whether or not an implicit move assignment operator 8045 // attempts to deduplicate calls to assignment operators of virtual bases are 8046 // made. As such, this exception specification is effectively unspecified. 8047 // Based on a similar decision made for constness in C++0x, we're erring on 8048 // the side of assuming such calls to be made regardless of whether they 8049 // actually happen. 8050 // Note that a move constructor is not implicitly declared when there are 8051 // virtual bases, but it can still be user-declared and explicitly defaulted. 8052 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8053 BaseEnd = ClassDecl->bases_end(); 8054 Base != BaseEnd; ++Base) { 8055 if (Base->isVirtual()) 8056 continue; 8057 8058 CXXRecordDecl *BaseClassDecl 8059 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8060 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8061 false, 0)) 8062 ExceptSpec.CalledDecl(MoveAssign); 8063 } 8064 8065 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8066 BaseEnd = ClassDecl->vbases_end(); 8067 Base != BaseEnd; ++Base) { 8068 CXXRecordDecl *BaseClassDecl 8069 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8070 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8071 false, 0)) 8072 ExceptSpec.CalledDecl(MoveAssign); 8073 } 8074 8075 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8076 FieldEnd = ClassDecl->field_end(); 8077 Field != FieldEnd; 8078 ++Field) { 8079 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8080 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8081 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 8082 false, 0)) 8083 ExceptSpec.CalledDecl(MoveAssign); 8084 } 8085 } 8086 8087 return ExceptSpec; 8088} 8089 8090/// Determine whether the class type has any direct or indirect virtual base 8091/// classes which have a non-trivial move assignment operator. 8092static bool 8093hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) { 8094 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8095 BaseEnd = ClassDecl->vbases_end(); 8096 Base != BaseEnd; ++Base) { 8097 CXXRecordDecl *BaseClass = 8098 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8099 8100 // Try to declare the move assignment. If it would be deleted, then the 8101 // class does not have a non-trivial move assignment. 8102 if (BaseClass->needsImplicitMoveAssignment()) 8103 S.DeclareImplicitMoveAssignment(BaseClass); 8104 8105 // If the class has both a trivial move assignment and a non-trivial move 8106 // assignment, hasTrivialMoveAssignment() is false. 8107 if (BaseClass->hasDeclaredMoveAssignment() && 8108 !BaseClass->hasTrivialMoveAssignment()) 8109 return true; 8110 } 8111 8112 return false; 8113} 8114 8115/// Determine whether the given type either has a move constructor or is 8116/// trivially copyable. 8117static bool 8118hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) { 8119 Type = S.Context.getBaseElementType(Type); 8120 8121 // FIXME: Technically, non-trivially-copyable non-class types, such as 8122 // reference types, are supposed to return false here, but that appears 8123 // to be a standard defect. 8124 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl(); 8125 if (!ClassDecl) 8126 return true; 8127 8128 if (Type.isTriviallyCopyableType(S.Context)) 8129 return true; 8130 8131 if (IsConstructor) { 8132 if (ClassDecl->needsImplicitMoveConstructor()) 8133 S.DeclareImplicitMoveConstructor(ClassDecl); 8134 return ClassDecl->hasDeclaredMoveConstructor(); 8135 } 8136 8137 if (ClassDecl->needsImplicitMoveAssignment()) 8138 S.DeclareImplicitMoveAssignment(ClassDecl); 8139 return ClassDecl->hasDeclaredMoveAssignment(); 8140} 8141 8142/// Determine whether all non-static data members and direct or virtual bases 8143/// of class \p ClassDecl have either a move operation, or are trivially 8144/// copyable. 8145static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl, 8146 bool IsConstructor) { 8147 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8148 BaseEnd = ClassDecl->bases_end(); 8149 Base != BaseEnd; ++Base) { 8150 if (Base->isVirtual()) 8151 continue; 8152 8153 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8154 return false; 8155 } 8156 8157 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8158 BaseEnd = ClassDecl->vbases_end(); 8159 Base != BaseEnd; ++Base) { 8160 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8161 return false; 8162 } 8163 8164 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8165 FieldEnd = ClassDecl->field_end(); 8166 Field != FieldEnd; ++Field) { 8167 if (!hasMoveOrIsTriviallyCopyable(S, (*Field)->getType(), IsConstructor)) 8168 return false; 8169 } 8170 8171 return true; 8172} 8173 8174CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8175 // C++11 [class.copy]p20: 8176 // If the definition of a class X does not explicitly declare a move 8177 // assignment operator, one will be implicitly declared as defaulted 8178 // if and only if: 8179 // 8180 // - [first 4 bullets] 8181 assert(ClassDecl->needsImplicitMoveAssignment()); 8182 8183 // [Checked after we build the declaration] 8184 // - the move assignment operator would not be implicitly defined as 8185 // deleted, 8186 8187 // [DR1402]: 8188 // - X has no direct or indirect virtual base class with a non-trivial 8189 // move assignment operator, and 8190 // - each of X's non-static data members and direct or virtual base classes 8191 // has a type that either has a move assignment operator or is trivially 8192 // copyable. 8193 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) || 8194 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) { 8195 ClassDecl->setFailedImplicitMoveAssignment(); 8196 return 0; 8197 } 8198 8199 // Note: The following rules are largely analoguous to the move 8200 // constructor rules. 8201 8202 ImplicitExceptionSpecification Spec( 8203 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 8204 8205 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8206 QualType RetType = Context.getLValueReferenceType(ArgType); 8207 ArgType = Context.getRValueReferenceType(ArgType); 8208 8209 // An implicitly-declared move assignment operator is an inline public 8210 // member of its class. 8211 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8212 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8213 SourceLocation ClassLoc = ClassDecl->getLocation(); 8214 DeclarationNameInfo NameInfo(Name, ClassLoc); 8215 CXXMethodDecl *MoveAssignment 8216 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8217 Context.getFunctionType(RetType, &ArgType, 1, EPI), 8218 /*TInfo=*/0, /*isStatic=*/false, 8219 /*StorageClassAsWritten=*/SC_None, 8220 /*isInline=*/true, 8221 /*isConstexpr=*/false, 8222 SourceLocation()); 8223 MoveAssignment->setAccess(AS_public); 8224 MoveAssignment->setDefaulted(); 8225 MoveAssignment->setImplicit(); 8226 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8227 8228 // Add the parameter to the operator. 8229 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8230 ClassLoc, ClassLoc, /*Id=*/0, 8231 ArgType, /*TInfo=*/0, 8232 SC_None, 8233 SC_None, 0); 8234 MoveAssignment->setParams(FromParam); 8235 8236 // Note that we have added this copy-assignment operator. 8237 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8238 8239 // C++0x [class.copy]p9: 8240 // If the definition of a class X does not explicitly declare a move 8241 // assignment operator, one will be implicitly declared as defaulted if and 8242 // only if: 8243 // [...] 8244 // - the move assignment operator would not be implicitly defined as 8245 // deleted. 8246 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 8247 // Cache this result so that we don't try to generate this over and over 8248 // on every lookup, leaking memory and wasting time. 8249 ClassDecl->setFailedImplicitMoveAssignment(); 8250 return 0; 8251 } 8252 8253 if (Scope *S = getScopeForContext(ClassDecl)) 8254 PushOnScopeChains(MoveAssignment, S, false); 8255 ClassDecl->addDecl(MoveAssignment); 8256 8257 AddOverriddenMethods(ClassDecl, MoveAssignment); 8258 return MoveAssignment; 8259} 8260 8261void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8262 CXXMethodDecl *MoveAssignOperator) { 8263 assert((MoveAssignOperator->isDefaulted() && 8264 MoveAssignOperator->isOverloadedOperator() && 8265 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8266 !MoveAssignOperator->doesThisDeclarationHaveABody() && 8267 !MoveAssignOperator->isDeleted()) && 8268 "DefineImplicitMoveAssignment called for wrong function"); 8269 8270 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8271 8272 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8273 MoveAssignOperator->setInvalidDecl(); 8274 return; 8275 } 8276 8277 MoveAssignOperator->setUsed(); 8278 8279 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8280 DiagnosticErrorTrap Trap(Diags); 8281 8282 // C++0x [class.copy]p28: 8283 // The implicitly-defined or move assignment operator for a non-union class 8284 // X performs memberwise move assignment of its subobjects. The direct base 8285 // classes of X are assigned first, in the order of their declaration in the 8286 // base-specifier-list, and then the immediate non-static data members of X 8287 // are assigned, in the order in which they were declared in the class 8288 // definition. 8289 8290 // The statements that form the synthesized function body. 8291 ASTOwningVector<Stmt*> Statements(*this); 8292 8293 // The parameter for the "other" object, which we are move from. 8294 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8295 QualType OtherRefType = Other->getType()-> 8296 getAs<RValueReferenceType>()->getPointeeType(); 8297 assert(OtherRefType.getQualifiers() == 0 && 8298 "Bad argument type of defaulted move assignment"); 8299 8300 // Our location for everything implicitly-generated. 8301 SourceLocation Loc = MoveAssignOperator->getLocation(); 8302 8303 // Construct a reference to the "other" object. We'll be using this 8304 // throughout the generated ASTs. 8305 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8306 assert(OtherRef && "Reference to parameter cannot fail!"); 8307 // Cast to rvalue. 8308 OtherRef = CastForMoving(*this, OtherRef); 8309 8310 // Construct the "this" pointer. We'll be using this throughout the generated 8311 // ASTs. 8312 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8313 assert(This && "Reference to this cannot fail!"); 8314 8315 // Assign base classes. 8316 bool Invalid = false; 8317 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8318 E = ClassDecl->bases_end(); Base != E; ++Base) { 8319 // Form the assignment: 8320 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8321 QualType BaseType = Base->getType().getUnqualifiedType(); 8322 if (!BaseType->isRecordType()) { 8323 Invalid = true; 8324 continue; 8325 } 8326 8327 CXXCastPath BasePath; 8328 BasePath.push_back(Base); 8329 8330 // Construct the "from" expression, which is an implicit cast to the 8331 // appropriately-qualified base type. 8332 Expr *From = OtherRef; 8333 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8334 VK_XValue, &BasePath).take(); 8335 8336 // Dereference "this". 8337 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8338 8339 // Implicitly cast "this" to the appropriately-qualified base type. 8340 To = ImpCastExprToType(To.take(), 8341 Context.getCVRQualifiedType(BaseType, 8342 MoveAssignOperator->getTypeQualifiers()), 8343 CK_UncheckedDerivedToBase, 8344 VK_LValue, &BasePath); 8345 8346 // Build the move. 8347 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8348 To.get(), From, 8349 /*CopyingBaseSubobject=*/true, 8350 /*Copying=*/false); 8351 if (Move.isInvalid()) { 8352 Diag(CurrentLocation, diag::note_member_synthesized_at) 8353 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8354 MoveAssignOperator->setInvalidDecl(); 8355 return; 8356 } 8357 8358 // Success! Record the move. 8359 Statements.push_back(Move.takeAs<Expr>()); 8360 } 8361 8362 // \brief Reference to the __builtin_memcpy function. 8363 Expr *BuiltinMemCpyRef = 0; 8364 // \brief Reference to the __builtin_objc_memmove_collectable function. 8365 Expr *CollectableMemCpyRef = 0; 8366 8367 // Assign non-static members. 8368 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8369 FieldEnd = ClassDecl->field_end(); 8370 Field != FieldEnd; ++Field) { 8371 if (Field->isUnnamedBitfield()) 8372 continue; 8373 8374 // Check for members of reference type; we can't move those. 8375 if (Field->getType()->isReferenceType()) { 8376 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8377 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8378 Diag(Field->getLocation(), diag::note_declared_at); 8379 Diag(CurrentLocation, diag::note_member_synthesized_at) 8380 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8381 Invalid = true; 8382 continue; 8383 } 8384 8385 // Check for members of const-qualified, non-class type. 8386 QualType BaseType = Context.getBaseElementType(Field->getType()); 8387 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8388 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8389 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8390 Diag(Field->getLocation(), diag::note_declared_at); 8391 Diag(CurrentLocation, diag::note_member_synthesized_at) 8392 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8393 Invalid = true; 8394 continue; 8395 } 8396 8397 // Suppress assigning zero-width bitfields. 8398 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8399 continue; 8400 8401 QualType FieldType = Field->getType().getNonReferenceType(); 8402 if (FieldType->isIncompleteArrayType()) { 8403 assert(ClassDecl->hasFlexibleArrayMember() && 8404 "Incomplete array type is not valid"); 8405 continue; 8406 } 8407 8408 // Build references to the field in the object we're copying from and to. 8409 CXXScopeSpec SS; // Intentionally empty 8410 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8411 LookupMemberName); 8412 MemberLookup.addDecl(*Field); 8413 MemberLookup.resolveKind(); 8414 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8415 Loc, /*IsArrow=*/false, 8416 SS, SourceLocation(), 0, 8417 MemberLookup, 0); 8418 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8419 Loc, /*IsArrow=*/true, 8420 SS, SourceLocation(), 0, 8421 MemberLookup, 0); 8422 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8423 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8424 8425 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8426 "Member reference with rvalue base must be rvalue except for reference " 8427 "members, which aren't allowed for move assignment."); 8428 8429 // If the field should be copied with __builtin_memcpy rather than via 8430 // explicit assignments, do so. This optimization only applies for arrays 8431 // of scalars and arrays of class type with trivial move-assignment 8432 // operators. 8433 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8434 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8435 // Compute the size of the memory buffer to be copied. 8436 QualType SizeType = Context.getSizeType(); 8437 llvm::APInt Size(Context.getTypeSize(SizeType), 8438 Context.getTypeSizeInChars(BaseType).getQuantity()); 8439 for (const ConstantArrayType *Array 8440 = Context.getAsConstantArrayType(FieldType); 8441 Array; 8442 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8443 llvm::APInt ArraySize 8444 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8445 Size *= ArraySize; 8446 } 8447 8448 // Take the address of the field references for "from" and "to". We 8449 // directly construct UnaryOperators here because semantic analysis 8450 // does not permit us to take the address of an xvalue. 8451 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8452 Context.getPointerType(From.get()->getType()), 8453 VK_RValue, OK_Ordinary, Loc); 8454 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8455 Context.getPointerType(To.get()->getType()), 8456 VK_RValue, OK_Ordinary, Loc); 8457 8458 bool NeedsCollectableMemCpy = 8459 (BaseType->isRecordType() && 8460 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8461 8462 if (NeedsCollectableMemCpy) { 8463 if (!CollectableMemCpyRef) { 8464 // Create a reference to the __builtin_objc_memmove_collectable function. 8465 LookupResult R(*this, 8466 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8467 Loc, LookupOrdinaryName); 8468 LookupName(R, TUScope, true); 8469 8470 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8471 if (!CollectableMemCpy) { 8472 // Something went horribly wrong earlier, and we will have 8473 // complained about it. 8474 Invalid = true; 8475 continue; 8476 } 8477 8478 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8479 CollectableMemCpy->getType(), 8480 VK_LValue, Loc, 0).take(); 8481 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8482 } 8483 } 8484 // Create a reference to the __builtin_memcpy builtin function. 8485 else if (!BuiltinMemCpyRef) { 8486 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8487 LookupOrdinaryName); 8488 LookupName(R, TUScope, true); 8489 8490 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8491 if (!BuiltinMemCpy) { 8492 // Something went horribly wrong earlier, and we will have complained 8493 // about it. 8494 Invalid = true; 8495 continue; 8496 } 8497 8498 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8499 BuiltinMemCpy->getType(), 8500 VK_LValue, Loc, 0).take(); 8501 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8502 } 8503 8504 ASTOwningVector<Expr*> CallArgs(*this); 8505 CallArgs.push_back(To.takeAs<Expr>()); 8506 CallArgs.push_back(From.takeAs<Expr>()); 8507 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8508 ExprResult Call = ExprError(); 8509 if (NeedsCollectableMemCpy) 8510 Call = ActOnCallExpr(/*Scope=*/0, 8511 CollectableMemCpyRef, 8512 Loc, move_arg(CallArgs), 8513 Loc); 8514 else 8515 Call = ActOnCallExpr(/*Scope=*/0, 8516 BuiltinMemCpyRef, 8517 Loc, move_arg(CallArgs), 8518 Loc); 8519 8520 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8521 Statements.push_back(Call.takeAs<Expr>()); 8522 continue; 8523 } 8524 8525 // Build the move of this field. 8526 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8527 To.get(), From.get(), 8528 /*CopyingBaseSubobject=*/false, 8529 /*Copying=*/false); 8530 if (Move.isInvalid()) { 8531 Diag(CurrentLocation, diag::note_member_synthesized_at) 8532 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8533 MoveAssignOperator->setInvalidDecl(); 8534 return; 8535 } 8536 8537 // Success! Record the copy. 8538 Statements.push_back(Move.takeAs<Stmt>()); 8539 } 8540 8541 if (!Invalid) { 8542 // Add a "return *this;" 8543 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8544 8545 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8546 if (Return.isInvalid()) 8547 Invalid = true; 8548 else { 8549 Statements.push_back(Return.takeAs<Stmt>()); 8550 8551 if (Trap.hasErrorOccurred()) { 8552 Diag(CurrentLocation, diag::note_member_synthesized_at) 8553 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8554 Invalid = true; 8555 } 8556 } 8557 } 8558 8559 if (Invalid) { 8560 MoveAssignOperator->setInvalidDecl(); 8561 return; 8562 } 8563 8564 StmtResult Body; 8565 { 8566 CompoundScopeRAII CompoundScope(*this); 8567 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8568 /*isStmtExpr=*/false); 8569 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8570 } 8571 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8572 8573 if (ASTMutationListener *L = getASTMutationListener()) { 8574 L->CompletedImplicitDefinition(MoveAssignOperator); 8575 } 8576} 8577 8578std::pair<Sema::ImplicitExceptionSpecification, bool> 8579Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8580 if (ClassDecl->isInvalidDecl()) 8581 return std::make_pair(ImplicitExceptionSpecification(Context), false); 8582 8583 // C++ [class.copy]p5: 8584 // The implicitly-declared copy constructor for a class X will 8585 // have the form 8586 // 8587 // X::X(const X&) 8588 // 8589 // if 8590 // FIXME: It ought to be possible to store this on the record. 8591 bool HasConstCopyConstructor = true; 8592 8593 // -- each direct or virtual base class B of X has a copy 8594 // constructor whose first parameter is of type const B& or 8595 // const volatile B&, and 8596 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8597 BaseEnd = ClassDecl->bases_end(); 8598 HasConstCopyConstructor && Base != BaseEnd; 8599 ++Base) { 8600 // Virtual bases are handled below. 8601 if (Base->isVirtual()) 8602 continue; 8603 8604 CXXRecordDecl *BaseClassDecl 8605 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8606 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8607 &HasConstCopyConstructor); 8608 } 8609 8610 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8611 BaseEnd = ClassDecl->vbases_end(); 8612 HasConstCopyConstructor && Base != BaseEnd; 8613 ++Base) { 8614 CXXRecordDecl *BaseClassDecl 8615 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8616 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8617 &HasConstCopyConstructor); 8618 } 8619 8620 // -- for all the nonstatic data members of X that are of a 8621 // class type M (or array thereof), each such class type 8622 // has a copy constructor whose first parameter is of type 8623 // const M& or const volatile M&. 8624 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8625 FieldEnd = ClassDecl->field_end(); 8626 HasConstCopyConstructor && Field != FieldEnd; 8627 ++Field) { 8628 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8629 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8630 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 8631 &HasConstCopyConstructor); 8632 } 8633 } 8634 // Otherwise, the implicitly declared copy constructor will have 8635 // the form 8636 // 8637 // X::X(X&) 8638 8639 // C++ [except.spec]p14: 8640 // An implicitly declared special member function (Clause 12) shall have an 8641 // exception-specification. [...] 8642 ImplicitExceptionSpecification ExceptSpec(Context); 8643 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8644 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8645 BaseEnd = ClassDecl->bases_end(); 8646 Base != BaseEnd; 8647 ++Base) { 8648 // Virtual bases are handled below. 8649 if (Base->isVirtual()) 8650 continue; 8651 8652 CXXRecordDecl *BaseClassDecl 8653 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8654 if (CXXConstructorDecl *CopyConstructor = 8655 LookupCopyingConstructor(BaseClassDecl, Quals)) 8656 ExceptSpec.CalledDecl(CopyConstructor); 8657 } 8658 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8659 BaseEnd = ClassDecl->vbases_end(); 8660 Base != BaseEnd; 8661 ++Base) { 8662 CXXRecordDecl *BaseClassDecl 8663 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8664 if (CXXConstructorDecl *CopyConstructor = 8665 LookupCopyingConstructor(BaseClassDecl, Quals)) 8666 ExceptSpec.CalledDecl(CopyConstructor); 8667 } 8668 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8669 FieldEnd = ClassDecl->field_end(); 8670 Field != FieldEnd; 8671 ++Field) { 8672 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8673 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8674 if (CXXConstructorDecl *CopyConstructor = 8675 LookupCopyingConstructor(FieldClassDecl, Quals)) 8676 ExceptSpec.CalledDecl(CopyConstructor); 8677 } 8678 } 8679 8680 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8681} 8682 8683CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8684 CXXRecordDecl *ClassDecl) { 8685 // C++ [class.copy]p4: 8686 // If the class definition does not explicitly declare a copy 8687 // constructor, one is declared implicitly. 8688 8689 ImplicitExceptionSpecification Spec(Context); 8690 bool Const; 8691 llvm::tie(Spec, Const) = 8692 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8693 8694 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8695 QualType ArgType = ClassType; 8696 if (Const) 8697 ArgType = ArgType.withConst(); 8698 ArgType = Context.getLValueReferenceType(ArgType); 8699 8700 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8701 8702 DeclarationName Name 8703 = Context.DeclarationNames.getCXXConstructorName( 8704 Context.getCanonicalType(ClassType)); 8705 SourceLocation ClassLoc = ClassDecl->getLocation(); 8706 DeclarationNameInfo NameInfo(Name, ClassLoc); 8707 8708 // An implicitly-declared copy constructor is an inline public 8709 // member of its class. 8710 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8711 Context, ClassDecl, ClassLoc, NameInfo, 8712 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8713 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8714 /*isConstexpr=*/ClassDecl->defaultedCopyConstructorIsConstexpr() && 8715 getLangOpts().CPlusPlus0x); 8716 CopyConstructor->setAccess(AS_public); 8717 CopyConstructor->setDefaulted(); 8718 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8719 8720 // Note that we have declared this constructor. 8721 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8722 8723 // Add the parameter to the constructor. 8724 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8725 ClassLoc, ClassLoc, 8726 /*IdentifierInfo=*/0, 8727 ArgType, /*TInfo=*/0, 8728 SC_None, 8729 SC_None, 0); 8730 CopyConstructor->setParams(FromParam); 8731 8732 if (Scope *S = getScopeForContext(ClassDecl)) 8733 PushOnScopeChains(CopyConstructor, S, false); 8734 ClassDecl->addDecl(CopyConstructor); 8735 8736 // C++11 [class.copy]p8: 8737 // ... If the class definition does not explicitly declare a copy 8738 // constructor, there is no user-declared move constructor, and there is no 8739 // user-declared move assignment operator, a copy constructor is implicitly 8740 // declared as defaulted. 8741 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8742 CopyConstructor->setDeletedAsWritten(); 8743 8744 return CopyConstructor; 8745} 8746 8747void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8748 CXXConstructorDecl *CopyConstructor) { 8749 assert((CopyConstructor->isDefaulted() && 8750 CopyConstructor->isCopyConstructor() && 8751 !CopyConstructor->doesThisDeclarationHaveABody() && 8752 !CopyConstructor->isDeleted()) && 8753 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8754 8755 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8756 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8757 8758 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8759 DiagnosticErrorTrap Trap(Diags); 8760 8761 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8762 Trap.hasErrorOccurred()) { 8763 Diag(CurrentLocation, diag::note_member_synthesized_at) 8764 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8765 CopyConstructor->setInvalidDecl(); 8766 } else { 8767 Sema::CompoundScopeRAII CompoundScope(*this); 8768 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8769 CopyConstructor->getLocation(), 8770 MultiStmtArg(*this, 0, 0), 8771 /*isStmtExpr=*/false) 8772 .takeAs<Stmt>()); 8773 CopyConstructor->setImplicitlyDefined(true); 8774 } 8775 8776 CopyConstructor->setUsed(); 8777 if (ASTMutationListener *L = getASTMutationListener()) { 8778 L->CompletedImplicitDefinition(CopyConstructor); 8779 } 8780} 8781 8782Sema::ImplicitExceptionSpecification 8783Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8784 // C++ [except.spec]p14: 8785 // An implicitly declared special member function (Clause 12) shall have an 8786 // exception-specification. [...] 8787 ImplicitExceptionSpecification ExceptSpec(Context); 8788 if (ClassDecl->isInvalidDecl()) 8789 return ExceptSpec; 8790 8791 // Direct base-class constructors. 8792 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8793 BEnd = ClassDecl->bases_end(); 8794 B != BEnd; ++B) { 8795 if (B->isVirtual()) // Handled below. 8796 continue; 8797 8798 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8799 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8800 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8801 // If this is a deleted function, add it anyway. This might be conformant 8802 // with the standard. This might not. I'm not sure. It might not matter. 8803 if (Constructor) 8804 ExceptSpec.CalledDecl(Constructor); 8805 } 8806 } 8807 8808 // Virtual base-class constructors. 8809 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8810 BEnd = ClassDecl->vbases_end(); 8811 B != BEnd; ++B) { 8812 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8813 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8814 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8815 // If this is a deleted function, add it anyway. This might be conformant 8816 // with the standard. This might not. I'm not sure. It might not matter. 8817 if (Constructor) 8818 ExceptSpec.CalledDecl(Constructor); 8819 } 8820 } 8821 8822 // Field constructors. 8823 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8824 FEnd = ClassDecl->field_end(); 8825 F != FEnd; ++F) { 8826 if (const RecordType *RecordTy 8827 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8828 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8829 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8830 // If this is a deleted function, add it anyway. This might be conformant 8831 // with the standard. This might not. I'm not sure. It might not matter. 8832 // In particular, the problem is that this function never gets called. It 8833 // might just be ill-formed because this function attempts to refer to 8834 // a deleted function here. 8835 if (Constructor) 8836 ExceptSpec.CalledDecl(Constructor); 8837 } 8838 } 8839 8840 return ExceptSpec; 8841} 8842 8843CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8844 CXXRecordDecl *ClassDecl) { 8845 // C++11 [class.copy]p9: 8846 // If the definition of a class X does not explicitly declare a move 8847 // constructor, one will be implicitly declared as defaulted if and only if: 8848 // 8849 // - [first 4 bullets] 8850 assert(ClassDecl->needsImplicitMoveConstructor()); 8851 8852 // [Checked after we build the declaration] 8853 // - the move assignment operator would not be implicitly defined as 8854 // deleted, 8855 8856 // [DR1402]: 8857 // - each of X's non-static data members and direct or virtual base classes 8858 // has a type that either has a move constructor or is trivially copyable. 8859 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) { 8860 ClassDecl->setFailedImplicitMoveConstructor(); 8861 return 0; 8862 } 8863 8864 ImplicitExceptionSpecification Spec( 8865 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8866 8867 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8868 QualType ArgType = Context.getRValueReferenceType(ClassType); 8869 8870 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8871 8872 DeclarationName Name 8873 = Context.DeclarationNames.getCXXConstructorName( 8874 Context.getCanonicalType(ClassType)); 8875 SourceLocation ClassLoc = ClassDecl->getLocation(); 8876 DeclarationNameInfo NameInfo(Name, ClassLoc); 8877 8878 // C++0x [class.copy]p11: 8879 // An implicitly-declared copy/move constructor is an inline public 8880 // member of its class. 8881 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8882 Context, ClassDecl, ClassLoc, NameInfo, 8883 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8884 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8885 /*isConstexpr=*/ClassDecl->defaultedMoveConstructorIsConstexpr() && 8886 getLangOpts().CPlusPlus0x); 8887 MoveConstructor->setAccess(AS_public); 8888 MoveConstructor->setDefaulted(); 8889 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8890 8891 // Add the parameter to the constructor. 8892 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8893 ClassLoc, ClassLoc, 8894 /*IdentifierInfo=*/0, 8895 ArgType, /*TInfo=*/0, 8896 SC_None, 8897 SC_None, 0); 8898 MoveConstructor->setParams(FromParam); 8899 8900 // C++0x [class.copy]p9: 8901 // If the definition of a class X does not explicitly declare a move 8902 // constructor, one will be implicitly declared as defaulted if and only if: 8903 // [...] 8904 // - the move constructor would not be implicitly defined as deleted. 8905 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8906 // Cache this result so that we don't try to generate this over and over 8907 // on every lookup, leaking memory and wasting time. 8908 ClassDecl->setFailedImplicitMoveConstructor(); 8909 return 0; 8910 } 8911 8912 // Note that we have declared this constructor. 8913 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8914 8915 if (Scope *S = getScopeForContext(ClassDecl)) 8916 PushOnScopeChains(MoveConstructor, S, false); 8917 ClassDecl->addDecl(MoveConstructor); 8918 8919 return MoveConstructor; 8920} 8921 8922void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8923 CXXConstructorDecl *MoveConstructor) { 8924 assert((MoveConstructor->isDefaulted() && 8925 MoveConstructor->isMoveConstructor() && 8926 !MoveConstructor->doesThisDeclarationHaveABody() && 8927 !MoveConstructor->isDeleted()) && 8928 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8929 8930 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8931 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8932 8933 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8934 DiagnosticErrorTrap Trap(Diags); 8935 8936 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8937 Trap.hasErrorOccurred()) { 8938 Diag(CurrentLocation, diag::note_member_synthesized_at) 8939 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8940 MoveConstructor->setInvalidDecl(); 8941 } else { 8942 Sema::CompoundScopeRAII CompoundScope(*this); 8943 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8944 MoveConstructor->getLocation(), 8945 MultiStmtArg(*this, 0, 0), 8946 /*isStmtExpr=*/false) 8947 .takeAs<Stmt>()); 8948 MoveConstructor->setImplicitlyDefined(true); 8949 } 8950 8951 MoveConstructor->setUsed(); 8952 8953 if (ASTMutationListener *L = getASTMutationListener()) { 8954 L->CompletedImplicitDefinition(MoveConstructor); 8955 } 8956} 8957 8958bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 8959 return FD->isDeleted() && 8960 (FD->isDefaulted() || FD->isImplicit()) && 8961 isa<CXXMethodDecl>(FD); 8962} 8963 8964/// \brief Mark the call operator of the given lambda closure type as "used". 8965static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 8966 CXXMethodDecl *CallOperator 8967 = cast<CXXMethodDecl>( 8968 *Lambda->lookup( 8969 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).first); 8970 CallOperator->setReferenced(); 8971 CallOperator->setUsed(); 8972} 8973 8974void Sema::DefineImplicitLambdaToFunctionPointerConversion( 8975 SourceLocation CurrentLocation, 8976 CXXConversionDecl *Conv) 8977{ 8978 CXXRecordDecl *Lambda = Conv->getParent(); 8979 8980 // Make sure that the lambda call operator is marked used. 8981 markLambdaCallOperatorUsed(*this, Lambda); 8982 8983 Conv->setUsed(); 8984 8985 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8986 DiagnosticErrorTrap Trap(Diags); 8987 8988 // Return the address of the __invoke function. 8989 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 8990 CXXMethodDecl *Invoke 8991 = cast<CXXMethodDecl>(*Lambda->lookup(InvokeName).first); 8992 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 8993 VK_LValue, Conv->getLocation()).take(); 8994 assert(FunctionRef && "Can't refer to __invoke function?"); 8995 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 8996 Conv->setBody(new (Context) CompoundStmt(Context, &Return, 1, 8997 Conv->getLocation(), 8998 Conv->getLocation())); 8999 9000 // Fill in the __invoke function with a dummy implementation. IR generation 9001 // will fill in the actual details. 9002 Invoke->setUsed(); 9003 Invoke->setReferenced(); 9004 Invoke->setBody(new (Context) CompoundStmt(Context, 0, 0, Conv->getLocation(), 9005 Conv->getLocation())); 9006 9007 if (ASTMutationListener *L = getASTMutationListener()) { 9008 L->CompletedImplicitDefinition(Conv); 9009 L->CompletedImplicitDefinition(Invoke); 9010 } 9011} 9012 9013void Sema::DefineImplicitLambdaToBlockPointerConversion( 9014 SourceLocation CurrentLocation, 9015 CXXConversionDecl *Conv) 9016{ 9017 Conv->setUsed(); 9018 9019 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 9020 DiagnosticErrorTrap Trap(Diags); 9021 9022 // Copy-initialize the lambda object as needed to capture it. 9023 Expr *This = ActOnCXXThis(CurrentLocation).take(); 9024 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 9025 9026 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 9027 Conv->getLocation(), 9028 Conv, DerefThis); 9029 9030 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 9031 // behavior. Note that only the general conversion function does this 9032 // (since it's unusable otherwise); in the case where we inline the 9033 // block literal, it has block literal lifetime semantics. 9034 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 9035 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 9036 CK_CopyAndAutoreleaseBlockObject, 9037 BuildBlock.get(), 0, VK_RValue); 9038 9039 if (BuildBlock.isInvalid()) { 9040 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9041 Conv->setInvalidDecl(); 9042 return; 9043 } 9044 9045 // Create the return statement that returns the block from the conversion 9046 // function. 9047 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 9048 if (Return.isInvalid()) { 9049 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9050 Conv->setInvalidDecl(); 9051 return; 9052 } 9053 9054 // Set the body of the conversion function. 9055 Stmt *ReturnS = Return.take(); 9056 Conv->setBody(new (Context) CompoundStmt(Context, &ReturnS, 1, 9057 Conv->getLocation(), 9058 Conv->getLocation())); 9059 9060 // We're done; notify the mutation listener, if any. 9061 if (ASTMutationListener *L = getASTMutationListener()) { 9062 L->CompletedImplicitDefinition(Conv); 9063 } 9064} 9065 9066/// \brief Determine whether the given list arguments contains exactly one 9067/// "real" (non-default) argument. 9068static bool hasOneRealArgument(MultiExprArg Args) { 9069 switch (Args.size()) { 9070 case 0: 9071 return false; 9072 9073 default: 9074 if (!Args.get()[1]->isDefaultArgument()) 9075 return false; 9076 9077 // fall through 9078 case 1: 9079 return !Args.get()[0]->isDefaultArgument(); 9080 } 9081 9082 return false; 9083} 9084 9085ExprResult 9086Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9087 CXXConstructorDecl *Constructor, 9088 MultiExprArg ExprArgs, 9089 bool HadMultipleCandidates, 9090 bool RequiresZeroInit, 9091 unsigned ConstructKind, 9092 SourceRange ParenRange) { 9093 bool Elidable = false; 9094 9095 // C++0x [class.copy]p34: 9096 // When certain criteria are met, an implementation is allowed to 9097 // omit the copy/move construction of a class object, even if the 9098 // copy/move constructor and/or destructor for the object have 9099 // side effects. [...] 9100 // - when a temporary class object that has not been bound to a 9101 // reference (12.2) would be copied/moved to a class object 9102 // with the same cv-unqualified type, the copy/move operation 9103 // can be omitted by constructing the temporary object 9104 // directly into the target of the omitted copy/move 9105 if (ConstructKind == CXXConstructExpr::CK_Complete && 9106 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 9107 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 9108 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 9109 } 9110 9111 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 9112 Elidable, move(ExprArgs), HadMultipleCandidates, 9113 RequiresZeroInit, ConstructKind, ParenRange); 9114} 9115 9116/// BuildCXXConstructExpr - Creates a complete call to a constructor, 9117/// including handling of its default argument expressions. 9118ExprResult 9119Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9120 CXXConstructorDecl *Constructor, bool Elidable, 9121 MultiExprArg ExprArgs, 9122 bool HadMultipleCandidates, 9123 bool RequiresZeroInit, 9124 unsigned ConstructKind, 9125 SourceRange ParenRange) { 9126 unsigned NumExprs = ExprArgs.size(); 9127 Expr **Exprs = (Expr **)ExprArgs.release(); 9128 9129 for (specific_attr_iterator<NonNullAttr> 9130 i = Constructor->specific_attr_begin<NonNullAttr>(), 9131 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 9132 const NonNullAttr *NonNull = *i; 9133 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 9134 } 9135 9136 MarkFunctionReferenced(ConstructLoc, Constructor); 9137 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 9138 Constructor, Elidable, Exprs, NumExprs, 9139 HadMultipleCandidates, /*FIXME*/false, 9140 RequiresZeroInit, 9141 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 9142 ParenRange)); 9143} 9144 9145bool Sema::InitializeVarWithConstructor(VarDecl *VD, 9146 CXXConstructorDecl *Constructor, 9147 MultiExprArg Exprs, 9148 bool HadMultipleCandidates) { 9149 // FIXME: Provide the correct paren SourceRange when available. 9150 ExprResult TempResult = 9151 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 9152 move(Exprs), HadMultipleCandidates, false, 9153 CXXConstructExpr::CK_Complete, SourceRange()); 9154 if (TempResult.isInvalid()) 9155 return true; 9156 9157 Expr *Temp = TempResult.takeAs<Expr>(); 9158 CheckImplicitConversions(Temp, VD->getLocation()); 9159 MarkFunctionReferenced(VD->getLocation(), Constructor); 9160 Temp = MaybeCreateExprWithCleanups(Temp); 9161 VD->setInit(Temp); 9162 9163 return false; 9164} 9165 9166void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9167 if (VD->isInvalidDecl()) return; 9168 9169 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9170 if (ClassDecl->isInvalidDecl()) return; 9171 if (ClassDecl->hasIrrelevantDestructor()) return; 9172 if (ClassDecl->isDependentContext()) return; 9173 9174 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9175 MarkFunctionReferenced(VD->getLocation(), Destructor); 9176 CheckDestructorAccess(VD->getLocation(), Destructor, 9177 PDiag(diag::err_access_dtor_var) 9178 << VD->getDeclName() 9179 << VD->getType()); 9180 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 9181 9182 if (!VD->hasGlobalStorage()) return; 9183 9184 // Emit warning for non-trivial dtor in global scope (a real global, 9185 // class-static, function-static). 9186 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9187 9188 // TODO: this should be re-enabled for static locals by !CXAAtExit 9189 if (!VD->isStaticLocal()) 9190 Diag(VD->getLocation(), diag::warn_global_destructor); 9191} 9192 9193/// \brief Given a constructor and the set of arguments provided for the 9194/// constructor, convert the arguments and add any required default arguments 9195/// to form a proper call to this constructor. 9196/// 9197/// \returns true if an error occurred, false otherwise. 9198bool 9199Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9200 MultiExprArg ArgsPtr, 9201 SourceLocation Loc, 9202 ASTOwningVector<Expr*> &ConvertedArgs, 9203 bool AllowExplicit) { 9204 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9205 unsigned NumArgs = ArgsPtr.size(); 9206 Expr **Args = (Expr **)ArgsPtr.get(); 9207 9208 const FunctionProtoType *Proto 9209 = Constructor->getType()->getAs<FunctionProtoType>(); 9210 assert(Proto && "Constructor without a prototype?"); 9211 unsigned NumArgsInProto = Proto->getNumArgs(); 9212 9213 // If too few arguments are available, we'll fill in the rest with defaults. 9214 if (NumArgs < NumArgsInProto) 9215 ConvertedArgs.reserve(NumArgsInProto); 9216 else 9217 ConvertedArgs.reserve(NumArgs); 9218 9219 VariadicCallType CallType = 9220 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9221 SmallVector<Expr *, 8> AllArgs; 9222 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9223 Proto, 0, Args, NumArgs, AllArgs, 9224 CallType, AllowExplicit); 9225 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 9226 9227 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size()); 9228 9229 // FIXME: Missing call to CheckFunctionCall or equivalent 9230 9231 return Invalid; 9232} 9233 9234static inline bool 9235CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9236 const FunctionDecl *FnDecl) { 9237 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9238 if (isa<NamespaceDecl>(DC)) { 9239 return SemaRef.Diag(FnDecl->getLocation(), 9240 diag::err_operator_new_delete_declared_in_namespace) 9241 << FnDecl->getDeclName(); 9242 } 9243 9244 if (isa<TranslationUnitDecl>(DC) && 9245 FnDecl->getStorageClass() == SC_Static) { 9246 return SemaRef.Diag(FnDecl->getLocation(), 9247 diag::err_operator_new_delete_declared_static) 9248 << FnDecl->getDeclName(); 9249 } 9250 9251 return false; 9252} 9253 9254static inline bool 9255CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9256 CanQualType ExpectedResultType, 9257 CanQualType ExpectedFirstParamType, 9258 unsigned DependentParamTypeDiag, 9259 unsigned InvalidParamTypeDiag) { 9260 QualType ResultType = 9261 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9262 9263 // Check that the result type is not dependent. 9264 if (ResultType->isDependentType()) 9265 return SemaRef.Diag(FnDecl->getLocation(), 9266 diag::err_operator_new_delete_dependent_result_type) 9267 << FnDecl->getDeclName() << ExpectedResultType; 9268 9269 // Check that the result type is what we expect. 9270 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9271 return SemaRef.Diag(FnDecl->getLocation(), 9272 diag::err_operator_new_delete_invalid_result_type) 9273 << FnDecl->getDeclName() << ExpectedResultType; 9274 9275 // A function template must have at least 2 parameters. 9276 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9277 return SemaRef.Diag(FnDecl->getLocation(), 9278 diag::err_operator_new_delete_template_too_few_parameters) 9279 << FnDecl->getDeclName(); 9280 9281 // The function decl must have at least 1 parameter. 9282 if (FnDecl->getNumParams() == 0) 9283 return SemaRef.Diag(FnDecl->getLocation(), 9284 diag::err_operator_new_delete_too_few_parameters) 9285 << FnDecl->getDeclName(); 9286 9287 // Check the the first parameter type is not dependent. 9288 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9289 if (FirstParamType->isDependentType()) 9290 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9291 << FnDecl->getDeclName() << ExpectedFirstParamType; 9292 9293 // Check that the first parameter type is what we expect. 9294 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9295 ExpectedFirstParamType) 9296 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9297 << FnDecl->getDeclName() << ExpectedFirstParamType; 9298 9299 return false; 9300} 9301 9302static bool 9303CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9304 // C++ [basic.stc.dynamic.allocation]p1: 9305 // A program is ill-formed if an allocation function is declared in a 9306 // namespace scope other than global scope or declared static in global 9307 // scope. 9308 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9309 return true; 9310 9311 CanQualType SizeTy = 9312 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9313 9314 // C++ [basic.stc.dynamic.allocation]p1: 9315 // The return type shall be void*. The first parameter shall have type 9316 // std::size_t. 9317 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9318 SizeTy, 9319 diag::err_operator_new_dependent_param_type, 9320 diag::err_operator_new_param_type)) 9321 return true; 9322 9323 // C++ [basic.stc.dynamic.allocation]p1: 9324 // The first parameter shall not have an associated default argument. 9325 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9326 return SemaRef.Diag(FnDecl->getLocation(), 9327 diag::err_operator_new_default_arg) 9328 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9329 9330 return false; 9331} 9332 9333static bool 9334CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9335 // C++ [basic.stc.dynamic.deallocation]p1: 9336 // A program is ill-formed if deallocation functions are declared in a 9337 // namespace scope other than global scope or declared static in global 9338 // scope. 9339 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9340 return true; 9341 9342 // C++ [basic.stc.dynamic.deallocation]p2: 9343 // Each deallocation function shall return void and its first parameter 9344 // shall be void*. 9345 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9346 SemaRef.Context.VoidPtrTy, 9347 diag::err_operator_delete_dependent_param_type, 9348 diag::err_operator_delete_param_type)) 9349 return true; 9350 9351 return false; 9352} 9353 9354/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9355/// of this overloaded operator is well-formed. If so, returns false; 9356/// otherwise, emits appropriate diagnostics and returns true. 9357bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9358 assert(FnDecl && FnDecl->isOverloadedOperator() && 9359 "Expected an overloaded operator declaration"); 9360 9361 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9362 9363 // C++ [over.oper]p5: 9364 // The allocation and deallocation functions, operator new, 9365 // operator new[], operator delete and operator delete[], are 9366 // described completely in 3.7.3. The attributes and restrictions 9367 // found in the rest of this subclause do not apply to them unless 9368 // explicitly stated in 3.7.3. 9369 if (Op == OO_Delete || Op == OO_Array_Delete) 9370 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9371 9372 if (Op == OO_New || Op == OO_Array_New) 9373 return CheckOperatorNewDeclaration(*this, FnDecl); 9374 9375 // C++ [over.oper]p6: 9376 // An operator function shall either be a non-static member 9377 // function or be a non-member function and have at least one 9378 // parameter whose type is a class, a reference to a class, an 9379 // enumeration, or a reference to an enumeration. 9380 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9381 if (MethodDecl->isStatic()) 9382 return Diag(FnDecl->getLocation(), 9383 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9384 } else { 9385 bool ClassOrEnumParam = false; 9386 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9387 ParamEnd = FnDecl->param_end(); 9388 Param != ParamEnd; ++Param) { 9389 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9390 if (ParamType->isDependentType() || ParamType->isRecordType() || 9391 ParamType->isEnumeralType()) { 9392 ClassOrEnumParam = true; 9393 break; 9394 } 9395 } 9396 9397 if (!ClassOrEnumParam) 9398 return Diag(FnDecl->getLocation(), 9399 diag::err_operator_overload_needs_class_or_enum) 9400 << FnDecl->getDeclName(); 9401 } 9402 9403 // C++ [over.oper]p8: 9404 // An operator function cannot have default arguments (8.3.6), 9405 // except where explicitly stated below. 9406 // 9407 // Only the function-call operator allows default arguments 9408 // (C++ [over.call]p1). 9409 if (Op != OO_Call) { 9410 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9411 Param != FnDecl->param_end(); ++Param) { 9412 if ((*Param)->hasDefaultArg()) 9413 return Diag((*Param)->getLocation(), 9414 diag::err_operator_overload_default_arg) 9415 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9416 } 9417 } 9418 9419 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9420 { false, false, false } 9421#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9422 , { Unary, Binary, MemberOnly } 9423#include "clang/Basic/OperatorKinds.def" 9424 }; 9425 9426 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9427 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9428 bool MustBeMemberOperator = OperatorUses[Op][2]; 9429 9430 // C++ [over.oper]p8: 9431 // [...] Operator functions cannot have more or fewer parameters 9432 // than the number required for the corresponding operator, as 9433 // described in the rest of this subclause. 9434 unsigned NumParams = FnDecl->getNumParams() 9435 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9436 if (Op != OO_Call && 9437 ((NumParams == 1 && !CanBeUnaryOperator) || 9438 (NumParams == 2 && !CanBeBinaryOperator) || 9439 (NumParams < 1) || (NumParams > 2))) { 9440 // We have the wrong number of parameters. 9441 unsigned ErrorKind; 9442 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9443 ErrorKind = 2; // 2 -> unary or binary. 9444 } else if (CanBeUnaryOperator) { 9445 ErrorKind = 0; // 0 -> unary 9446 } else { 9447 assert(CanBeBinaryOperator && 9448 "All non-call overloaded operators are unary or binary!"); 9449 ErrorKind = 1; // 1 -> binary 9450 } 9451 9452 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9453 << FnDecl->getDeclName() << NumParams << ErrorKind; 9454 } 9455 9456 // Overloaded operators other than operator() cannot be variadic. 9457 if (Op != OO_Call && 9458 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9459 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9460 << FnDecl->getDeclName(); 9461 } 9462 9463 // Some operators must be non-static member functions. 9464 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9465 return Diag(FnDecl->getLocation(), 9466 diag::err_operator_overload_must_be_member) 9467 << FnDecl->getDeclName(); 9468 } 9469 9470 // C++ [over.inc]p1: 9471 // The user-defined function called operator++ implements the 9472 // prefix and postfix ++ operator. If this function is a member 9473 // function with no parameters, or a non-member function with one 9474 // parameter of class or enumeration type, it defines the prefix 9475 // increment operator ++ for objects of that type. If the function 9476 // is a member function with one parameter (which shall be of type 9477 // int) or a non-member function with two parameters (the second 9478 // of which shall be of type int), it defines the postfix 9479 // increment operator ++ for objects of that type. 9480 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9481 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9482 bool ParamIsInt = false; 9483 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9484 ParamIsInt = BT->getKind() == BuiltinType::Int; 9485 9486 if (!ParamIsInt) 9487 return Diag(LastParam->getLocation(), 9488 diag::err_operator_overload_post_incdec_must_be_int) 9489 << LastParam->getType() << (Op == OO_MinusMinus); 9490 } 9491 9492 return false; 9493} 9494 9495/// CheckLiteralOperatorDeclaration - Check whether the declaration 9496/// of this literal operator function is well-formed. If so, returns 9497/// false; otherwise, emits appropriate diagnostics and returns true. 9498bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9499 if (isa<CXXMethodDecl>(FnDecl)) { 9500 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9501 << FnDecl->getDeclName(); 9502 return true; 9503 } 9504 9505 if (FnDecl->isExternC()) { 9506 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 9507 return true; 9508 } 9509 9510 bool Valid = false; 9511 9512 // This might be the definition of a literal operator template. 9513 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 9514 // This might be a specialization of a literal operator template. 9515 if (!TpDecl) 9516 TpDecl = FnDecl->getPrimaryTemplate(); 9517 9518 // template <char...> type operator "" name() is the only valid template 9519 // signature, and the only valid signature with no parameters. 9520 if (TpDecl) { 9521 if (FnDecl->param_size() == 0) { 9522 // Must have only one template parameter 9523 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9524 if (Params->size() == 1) { 9525 NonTypeTemplateParmDecl *PmDecl = 9526 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9527 9528 // The template parameter must be a char parameter pack. 9529 if (PmDecl && PmDecl->isTemplateParameterPack() && 9530 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9531 Valid = true; 9532 } 9533 } 9534 } else if (FnDecl->param_size()) { 9535 // Check the first parameter 9536 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9537 9538 QualType T = (*Param)->getType().getUnqualifiedType(); 9539 9540 // unsigned long long int, long double, and any character type are allowed 9541 // as the only parameters. 9542 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9543 Context.hasSameType(T, Context.LongDoubleTy) || 9544 Context.hasSameType(T, Context.CharTy) || 9545 Context.hasSameType(T, Context.WCharTy) || 9546 Context.hasSameType(T, Context.Char16Ty) || 9547 Context.hasSameType(T, Context.Char32Ty)) { 9548 if (++Param == FnDecl->param_end()) 9549 Valid = true; 9550 goto FinishedParams; 9551 } 9552 9553 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9554 const PointerType *PT = T->getAs<PointerType>(); 9555 if (!PT) 9556 goto FinishedParams; 9557 T = PT->getPointeeType(); 9558 if (!T.isConstQualified() || T.isVolatileQualified()) 9559 goto FinishedParams; 9560 T = T.getUnqualifiedType(); 9561 9562 // Move on to the second parameter; 9563 ++Param; 9564 9565 // If there is no second parameter, the first must be a const char * 9566 if (Param == FnDecl->param_end()) { 9567 if (Context.hasSameType(T, Context.CharTy)) 9568 Valid = true; 9569 goto FinishedParams; 9570 } 9571 9572 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9573 // are allowed as the first parameter to a two-parameter function 9574 if (!(Context.hasSameType(T, Context.CharTy) || 9575 Context.hasSameType(T, Context.WCharTy) || 9576 Context.hasSameType(T, Context.Char16Ty) || 9577 Context.hasSameType(T, Context.Char32Ty))) 9578 goto FinishedParams; 9579 9580 // The second and final parameter must be an std::size_t 9581 T = (*Param)->getType().getUnqualifiedType(); 9582 if (Context.hasSameType(T, Context.getSizeType()) && 9583 ++Param == FnDecl->param_end()) 9584 Valid = true; 9585 } 9586 9587 // FIXME: This diagnostic is absolutely terrible. 9588FinishedParams: 9589 if (!Valid) { 9590 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9591 << FnDecl->getDeclName(); 9592 return true; 9593 } 9594 9595 // A parameter-declaration-clause containing a default argument is not 9596 // equivalent to any of the permitted forms. 9597 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9598 ParamEnd = FnDecl->param_end(); 9599 Param != ParamEnd; ++Param) { 9600 if ((*Param)->hasDefaultArg()) { 9601 Diag((*Param)->getDefaultArgRange().getBegin(), 9602 diag::err_literal_operator_default_argument) 9603 << (*Param)->getDefaultArgRange(); 9604 break; 9605 } 9606 } 9607 9608 StringRef LiteralName 9609 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9610 if (LiteralName[0] != '_') { 9611 // C++11 [usrlit.suffix]p1: 9612 // Literal suffix identifiers that do not start with an underscore 9613 // are reserved for future standardization. 9614 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9615 } 9616 9617 return false; 9618} 9619 9620/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9621/// linkage specification, including the language and (if present) 9622/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9623/// the location of the language string literal, which is provided 9624/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9625/// the '{' brace. Otherwise, this linkage specification does not 9626/// have any braces. 9627Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9628 SourceLocation LangLoc, 9629 StringRef Lang, 9630 SourceLocation LBraceLoc) { 9631 LinkageSpecDecl::LanguageIDs Language; 9632 if (Lang == "\"C\"") 9633 Language = LinkageSpecDecl::lang_c; 9634 else if (Lang == "\"C++\"") 9635 Language = LinkageSpecDecl::lang_cxx; 9636 else { 9637 Diag(LangLoc, diag::err_bad_language); 9638 return 0; 9639 } 9640 9641 // FIXME: Add all the various semantics of linkage specifications 9642 9643 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9644 ExternLoc, LangLoc, Language); 9645 CurContext->addDecl(D); 9646 PushDeclContext(S, D); 9647 return D; 9648} 9649 9650/// ActOnFinishLinkageSpecification - Complete the definition of 9651/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9652/// valid, it's the position of the closing '}' brace in a linkage 9653/// specification that uses braces. 9654Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9655 Decl *LinkageSpec, 9656 SourceLocation RBraceLoc) { 9657 if (LinkageSpec) { 9658 if (RBraceLoc.isValid()) { 9659 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9660 LSDecl->setRBraceLoc(RBraceLoc); 9661 } 9662 PopDeclContext(); 9663 } 9664 return LinkageSpec; 9665} 9666 9667/// \brief Perform semantic analysis for the variable declaration that 9668/// occurs within a C++ catch clause, returning the newly-created 9669/// variable. 9670VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9671 TypeSourceInfo *TInfo, 9672 SourceLocation StartLoc, 9673 SourceLocation Loc, 9674 IdentifierInfo *Name) { 9675 bool Invalid = false; 9676 QualType ExDeclType = TInfo->getType(); 9677 9678 // Arrays and functions decay. 9679 if (ExDeclType->isArrayType()) 9680 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9681 else if (ExDeclType->isFunctionType()) 9682 ExDeclType = Context.getPointerType(ExDeclType); 9683 9684 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9685 // The exception-declaration shall not denote a pointer or reference to an 9686 // incomplete type, other than [cv] void*. 9687 // N2844 forbids rvalue references. 9688 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9689 Diag(Loc, diag::err_catch_rvalue_ref); 9690 Invalid = true; 9691 } 9692 9693 QualType BaseType = ExDeclType; 9694 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9695 unsigned DK = diag::err_catch_incomplete; 9696 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9697 BaseType = Ptr->getPointeeType(); 9698 Mode = 1; 9699 DK = diag::err_catch_incomplete_ptr; 9700 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9701 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9702 BaseType = Ref->getPointeeType(); 9703 Mode = 2; 9704 DK = diag::err_catch_incomplete_ref; 9705 } 9706 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9707 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 9708 Invalid = true; 9709 9710 if (!Invalid && !ExDeclType->isDependentType() && 9711 RequireNonAbstractType(Loc, ExDeclType, 9712 diag::err_abstract_type_in_decl, 9713 AbstractVariableType)) 9714 Invalid = true; 9715 9716 // Only the non-fragile NeXT runtime currently supports C++ catches 9717 // of ObjC types, and no runtime supports catching ObjC types by value. 9718 if (!Invalid && getLangOpts().ObjC1) { 9719 QualType T = ExDeclType; 9720 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9721 T = RT->getPointeeType(); 9722 9723 if (T->isObjCObjectType()) { 9724 Diag(Loc, diag::err_objc_object_catch); 9725 Invalid = true; 9726 } else if (T->isObjCObjectPointerType()) { 9727 if (!getLangOpts().ObjCNonFragileABI) 9728 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9729 } 9730 } 9731 9732 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9733 ExDeclType, TInfo, SC_None, SC_None); 9734 ExDecl->setExceptionVariable(true); 9735 9736 // In ARC, infer 'retaining' for variables of retainable type. 9737 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9738 Invalid = true; 9739 9740 if (!Invalid && !ExDeclType->isDependentType()) { 9741 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9742 // C++ [except.handle]p16: 9743 // The object declared in an exception-declaration or, if the 9744 // exception-declaration does not specify a name, a temporary (12.2) is 9745 // copy-initialized (8.5) from the exception object. [...] 9746 // The object is destroyed when the handler exits, after the destruction 9747 // of any automatic objects initialized within the handler. 9748 // 9749 // We just pretend to initialize the object with itself, then make sure 9750 // it can be destroyed later. 9751 QualType initType = ExDeclType; 9752 9753 InitializedEntity entity = 9754 InitializedEntity::InitializeVariable(ExDecl); 9755 InitializationKind initKind = 9756 InitializationKind::CreateCopy(Loc, SourceLocation()); 9757 9758 Expr *opaqueValue = 9759 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9760 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9761 ExprResult result = sequence.Perform(*this, entity, initKind, 9762 MultiExprArg(&opaqueValue, 1)); 9763 if (result.isInvalid()) 9764 Invalid = true; 9765 else { 9766 // If the constructor used was non-trivial, set this as the 9767 // "initializer". 9768 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9769 if (!construct->getConstructor()->isTrivial()) { 9770 Expr *init = MaybeCreateExprWithCleanups(construct); 9771 ExDecl->setInit(init); 9772 } 9773 9774 // And make sure it's destructable. 9775 FinalizeVarWithDestructor(ExDecl, recordType); 9776 } 9777 } 9778 } 9779 9780 if (Invalid) 9781 ExDecl->setInvalidDecl(); 9782 9783 return ExDecl; 9784} 9785 9786/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9787/// handler. 9788Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9789 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9790 bool Invalid = D.isInvalidType(); 9791 9792 // Check for unexpanded parameter packs. 9793 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9794 UPPC_ExceptionType)) { 9795 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9796 D.getIdentifierLoc()); 9797 Invalid = true; 9798 } 9799 9800 IdentifierInfo *II = D.getIdentifier(); 9801 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9802 LookupOrdinaryName, 9803 ForRedeclaration)) { 9804 // The scope should be freshly made just for us. There is just no way 9805 // it contains any previous declaration. 9806 assert(!S->isDeclScope(PrevDecl)); 9807 if (PrevDecl->isTemplateParameter()) { 9808 // Maybe we will complain about the shadowed template parameter. 9809 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9810 PrevDecl = 0; 9811 } 9812 } 9813 9814 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9815 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9816 << D.getCXXScopeSpec().getRange(); 9817 Invalid = true; 9818 } 9819 9820 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9821 D.getLocStart(), 9822 D.getIdentifierLoc(), 9823 D.getIdentifier()); 9824 if (Invalid) 9825 ExDecl->setInvalidDecl(); 9826 9827 // Add the exception declaration into this scope. 9828 if (II) 9829 PushOnScopeChains(ExDecl, S); 9830 else 9831 CurContext->addDecl(ExDecl); 9832 9833 ProcessDeclAttributes(S, ExDecl, D); 9834 return ExDecl; 9835} 9836 9837Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9838 Expr *AssertExpr, 9839 Expr *AssertMessageExpr_, 9840 SourceLocation RParenLoc) { 9841 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9842 9843 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9844 // In a static_assert-declaration, the constant-expression shall be a 9845 // constant expression that can be contextually converted to bool. 9846 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 9847 if (Converted.isInvalid()) 9848 return 0; 9849 9850 llvm::APSInt Cond; 9851 if (VerifyIntegerConstantExpression(Converted.get(), &Cond, 9852 PDiag(diag::err_static_assert_expression_is_not_constant), 9853 /*AllowFold=*/false).isInvalid()) 9854 return 0; 9855 9856 if (!Cond) { 9857 llvm::SmallString<256> MsgBuffer; 9858 llvm::raw_svector_ostream Msg(MsgBuffer); 9859 AssertMessage->printPretty(Msg, Context, 0, getPrintingPolicy()); 9860 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9861 << Msg.str() << AssertExpr->getSourceRange(); 9862 } 9863 } 9864 9865 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9866 return 0; 9867 9868 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9869 AssertExpr, AssertMessage, RParenLoc); 9870 9871 CurContext->addDecl(Decl); 9872 return Decl; 9873} 9874 9875/// \brief Perform semantic analysis of the given friend type declaration. 9876/// 9877/// \returns A friend declaration that. 9878FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc, 9879 SourceLocation FriendLoc, 9880 TypeSourceInfo *TSInfo) { 9881 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9882 9883 QualType T = TSInfo->getType(); 9884 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9885 9886 // C++03 [class.friend]p2: 9887 // An elaborated-type-specifier shall be used in a friend declaration 9888 // for a class.* 9889 // 9890 // * The class-key of the elaborated-type-specifier is required. 9891 if (!ActiveTemplateInstantiations.empty()) { 9892 // Do not complain about the form of friend template types during 9893 // template instantiation; we will already have complained when the 9894 // template was declared. 9895 } else if (!T->isElaboratedTypeSpecifier()) { 9896 // If we evaluated the type to a record type, suggest putting 9897 // a tag in front. 9898 if (const RecordType *RT = T->getAs<RecordType>()) { 9899 RecordDecl *RD = RT->getDecl(); 9900 9901 std::string InsertionText = std::string(" ") + RD->getKindName(); 9902 9903 Diag(TypeRange.getBegin(), 9904 getLangOpts().CPlusPlus0x ? 9905 diag::warn_cxx98_compat_unelaborated_friend_type : 9906 diag::ext_unelaborated_friend_type) 9907 << (unsigned) RD->getTagKind() 9908 << T 9909 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9910 InsertionText); 9911 } else { 9912 Diag(FriendLoc, 9913 getLangOpts().CPlusPlus0x ? 9914 diag::warn_cxx98_compat_nonclass_type_friend : 9915 diag::ext_nonclass_type_friend) 9916 << T 9917 << SourceRange(FriendLoc, TypeRange.getEnd()); 9918 } 9919 } else if (T->getAs<EnumType>()) { 9920 Diag(FriendLoc, 9921 getLangOpts().CPlusPlus0x ? 9922 diag::warn_cxx98_compat_enum_friend : 9923 diag::ext_enum_friend) 9924 << T 9925 << SourceRange(FriendLoc, TypeRange.getEnd()); 9926 } 9927 9928 // C++0x [class.friend]p3: 9929 // If the type specifier in a friend declaration designates a (possibly 9930 // cv-qualified) class type, that class is declared as a friend; otherwise, 9931 // the friend declaration is ignored. 9932 9933 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9934 // in [class.friend]p3 that we do not implement. 9935 9936 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc); 9937} 9938 9939/// Handle a friend tag declaration where the scope specifier was 9940/// templated. 9941Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9942 unsigned TagSpec, SourceLocation TagLoc, 9943 CXXScopeSpec &SS, 9944 IdentifierInfo *Name, SourceLocation NameLoc, 9945 AttributeList *Attr, 9946 MultiTemplateParamsArg TempParamLists) { 9947 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9948 9949 bool isExplicitSpecialization = false; 9950 bool Invalid = false; 9951 9952 if (TemplateParameterList *TemplateParams 9953 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9954 TempParamLists.get(), 9955 TempParamLists.size(), 9956 /*friend*/ true, 9957 isExplicitSpecialization, 9958 Invalid)) { 9959 if (TemplateParams->size() > 0) { 9960 // This is a declaration of a class template. 9961 if (Invalid) 9962 return 0; 9963 9964 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9965 SS, Name, NameLoc, Attr, 9966 TemplateParams, AS_public, 9967 /*ModulePrivateLoc=*/SourceLocation(), 9968 TempParamLists.size() - 1, 9969 (TemplateParameterList**) TempParamLists.release()).take(); 9970 } else { 9971 // The "template<>" header is extraneous. 9972 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9973 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9974 isExplicitSpecialization = true; 9975 } 9976 } 9977 9978 if (Invalid) return 0; 9979 9980 bool isAllExplicitSpecializations = true; 9981 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9982 if (TempParamLists.get()[I]->size()) { 9983 isAllExplicitSpecializations = false; 9984 break; 9985 } 9986 } 9987 9988 // FIXME: don't ignore attributes. 9989 9990 // If it's explicit specializations all the way down, just forget 9991 // about the template header and build an appropriate non-templated 9992 // friend. TODO: for source fidelity, remember the headers. 9993 if (isAllExplicitSpecializations) { 9994 if (SS.isEmpty()) { 9995 bool Owned = false; 9996 bool IsDependent = false; 9997 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 9998 Attr, AS_public, 9999 /*ModulePrivateLoc=*/SourceLocation(), 10000 MultiTemplateParamsArg(), Owned, IsDependent, 10001 /*ScopedEnumKWLoc=*/SourceLocation(), 10002 /*ScopedEnumUsesClassTag=*/false, 10003 /*UnderlyingType=*/TypeResult()); 10004 } 10005 10006 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 10007 ElaboratedTypeKeyword Keyword 10008 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10009 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 10010 *Name, NameLoc); 10011 if (T.isNull()) 10012 return 0; 10013 10014 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10015 if (isa<DependentNameType>(T)) { 10016 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10017 TL.setElaboratedKeywordLoc(TagLoc); 10018 TL.setQualifierLoc(QualifierLoc); 10019 TL.setNameLoc(NameLoc); 10020 } else { 10021 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 10022 TL.setElaboratedKeywordLoc(TagLoc); 10023 TL.setQualifierLoc(QualifierLoc); 10024 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 10025 } 10026 10027 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10028 TSI, FriendLoc); 10029 Friend->setAccess(AS_public); 10030 CurContext->addDecl(Friend); 10031 return Friend; 10032 } 10033 10034 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 10035 10036 10037 10038 // Handle the case of a templated-scope friend class. e.g. 10039 // template <class T> class A<T>::B; 10040 // FIXME: we don't support these right now. 10041 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10042 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 10043 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10044 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10045 TL.setElaboratedKeywordLoc(TagLoc); 10046 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 10047 TL.setNameLoc(NameLoc); 10048 10049 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10050 TSI, FriendLoc); 10051 Friend->setAccess(AS_public); 10052 Friend->setUnsupportedFriend(true); 10053 CurContext->addDecl(Friend); 10054 return Friend; 10055} 10056 10057 10058/// Handle a friend type declaration. This works in tandem with 10059/// ActOnTag. 10060/// 10061/// Notes on friend class templates: 10062/// 10063/// We generally treat friend class declarations as if they were 10064/// declaring a class. So, for example, the elaborated type specifier 10065/// in a friend declaration is required to obey the restrictions of a 10066/// class-head (i.e. no typedefs in the scope chain), template 10067/// parameters are required to match up with simple template-ids, &c. 10068/// However, unlike when declaring a template specialization, it's 10069/// okay to refer to a template specialization without an empty 10070/// template parameter declaration, e.g. 10071/// friend class A<T>::B<unsigned>; 10072/// We permit this as a special case; if there are any template 10073/// parameters present at all, require proper matching, i.e. 10074/// template <> template <class T> friend class A<int>::B; 10075Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 10076 MultiTemplateParamsArg TempParams) { 10077 SourceLocation Loc = DS.getLocStart(); 10078 10079 assert(DS.isFriendSpecified()); 10080 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10081 10082 // Try to convert the decl specifier to a type. This works for 10083 // friend templates because ActOnTag never produces a ClassTemplateDecl 10084 // for a TUK_Friend. 10085 Declarator TheDeclarator(DS, Declarator::MemberContext); 10086 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 10087 QualType T = TSI->getType(); 10088 if (TheDeclarator.isInvalidType()) 10089 return 0; 10090 10091 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 10092 return 0; 10093 10094 // This is definitely an error in C++98. It's probably meant to 10095 // be forbidden in C++0x, too, but the specification is just 10096 // poorly written. 10097 // 10098 // The problem is with declarations like the following: 10099 // template <T> friend A<T>::foo; 10100 // where deciding whether a class C is a friend or not now hinges 10101 // on whether there exists an instantiation of A that causes 10102 // 'foo' to equal C. There are restrictions on class-heads 10103 // (which we declare (by fiat) elaborated friend declarations to 10104 // be) that makes this tractable. 10105 // 10106 // FIXME: handle "template <> friend class A<T>;", which 10107 // is possibly well-formed? Who even knows? 10108 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 10109 Diag(Loc, diag::err_tagless_friend_type_template) 10110 << DS.getSourceRange(); 10111 return 0; 10112 } 10113 10114 // C++98 [class.friend]p1: A friend of a class is a function 10115 // or class that is not a member of the class . . . 10116 // This is fixed in DR77, which just barely didn't make the C++03 10117 // deadline. It's also a very silly restriction that seriously 10118 // affects inner classes and which nobody else seems to implement; 10119 // thus we never diagnose it, not even in -pedantic. 10120 // 10121 // But note that we could warn about it: it's always useless to 10122 // friend one of your own members (it's not, however, worthless to 10123 // friend a member of an arbitrary specialization of your template). 10124 10125 Decl *D; 10126 if (unsigned NumTempParamLists = TempParams.size()) 10127 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10128 NumTempParamLists, 10129 TempParams.release(), 10130 TSI, 10131 DS.getFriendSpecLoc()); 10132 else 10133 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 10134 10135 if (!D) 10136 return 0; 10137 10138 D->setAccess(AS_public); 10139 CurContext->addDecl(D); 10140 10141 return D; 10142} 10143 10144Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 10145 MultiTemplateParamsArg TemplateParams) { 10146 const DeclSpec &DS = D.getDeclSpec(); 10147 10148 assert(DS.isFriendSpecified()); 10149 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10150 10151 SourceLocation Loc = D.getIdentifierLoc(); 10152 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10153 10154 // C++ [class.friend]p1 10155 // A friend of a class is a function or class.... 10156 // Note that this sees through typedefs, which is intended. 10157 // It *doesn't* see through dependent types, which is correct 10158 // according to [temp.arg.type]p3: 10159 // If a declaration acquires a function type through a 10160 // type dependent on a template-parameter and this causes 10161 // a declaration that does not use the syntactic form of a 10162 // function declarator to have a function type, the program 10163 // is ill-formed. 10164 if (!TInfo->getType()->isFunctionType()) { 10165 Diag(Loc, diag::err_unexpected_friend); 10166 10167 // It might be worthwhile to try to recover by creating an 10168 // appropriate declaration. 10169 return 0; 10170 } 10171 10172 // C++ [namespace.memdef]p3 10173 // - If a friend declaration in a non-local class first declares a 10174 // class or function, the friend class or function is a member 10175 // of the innermost enclosing namespace. 10176 // - The name of the friend is not found by simple name lookup 10177 // until a matching declaration is provided in that namespace 10178 // scope (either before or after the class declaration granting 10179 // friendship). 10180 // - If a friend function is called, its name may be found by the 10181 // name lookup that considers functions from namespaces and 10182 // classes associated with the types of the function arguments. 10183 // - When looking for a prior declaration of a class or a function 10184 // declared as a friend, scopes outside the innermost enclosing 10185 // namespace scope are not considered. 10186 10187 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10188 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10189 DeclarationName Name = NameInfo.getName(); 10190 assert(Name); 10191 10192 // Check for unexpanded parameter packs. 10193 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10194 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10195 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10196 return 0; 10197 10198 // The context we found the declaration in, or in which we should 10199 // create the declaration. 10200 DeclContext *DC; 10201 Scope *DCScope = S; 10202 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10203 ForRedeclaration); 10204 10205 // FIXME: there are different rules in local classes 10206 10207 // There are four cases here. 10208 // - There's no scope specifier, in which case we just go to the 10209 // appropriate scope and look for a function or function template 10210 // there as appropriate. 10211 // Recover from invalid scope qualifiers as if they just weren't there. 10212 if (SS.isInvalid() || !SS.isSet()) { 10213 // C++0x [namespace.memdef]p3: 10214 // If the name in a friend declaration is neither qualified nor 10215 // a template-id and the declaration is a function or an 10216 // elaborated-type-specifier, the lookup to determine whether 10217 // the entity has been previously declared shall not consider 10218 // any scopes outside the innermost enclosing namespace. 10219 // C++0x [class.friend]p11: 10220 // If a friend declaration appears in a local class and the name 10221 // specified is an unqualified name, a prior declaration is 10222 // looked up without considering scopes that are outside the 10223 // innermost enclosing non-class scope. For a friend function 10224 // declaration, if there is no prior declaration, the program is 10225 // ill-formed. 10226 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10227 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10228 10229 // Find the appropriate context according to the above. 10230 DC = CurContext; 10231 while (true) { 10232 // Skip class contexts. If someone can cite chapter and verse 10233 // for this behavior, that would be nice --- it's what GCC and 10234 // EDG do, and it seems like a reasonable intent, but the spec 10235 // really only says that checks for unqualified existing 10236 // declarations should stop at the nearest enclosing namespace, 10237 // not that they should only consider the nearest enclosing 10238 // namespace. 10239 while (DC->isRecord() || DC->isTransparentContext()) 10240 DC = DC->getParent(); 10241 10242 LookupQualifiedName(Previous, DC); 10243 10244 // TODO: decide what we think about using declarations. 10245 if (isLocal || !Previous.empty()) 10246 break; 10247 10248 if (isTemplateId) { 10249 if (isa<TranslationUnitDecl>(DC)) break; 10250 } else { 10251 if (DC->isFileContext()) break; 10252 } 10253 DC = DC->getParent(); 10254 } 10255 10256 // C++ [class.friend]p1: A friend of a class is a function or 10257 // class that is not a member of the class . . . 10258 // C++11 changes this for both friend types and functions. 10259 // Most C++ 98 compilers do seem to give an error here, so 10260 // we do, too. 10261 if (!Previous.empty() && DC->Equals(CurContext)) 10262 Diag(DS.getFriendSpecLoc(), 10263 getLangOpts().CPlusPlus0x ? 10264 diag::warn_cxx98_compat_friend_is_member : 10265 diag::err_friend_is_member); 10266 10267 DCScope = getScopeForDeclContext(S, DC); 10268 10269 // C++ [class.friend]p6: 10270 // A function can be defined in a friend declaration of a class if and 10271 // only if the class is a non-local class (9.8), the function name is 10272 // unqualified, and the function has namespace scope. 10273 if (isLocal && D.isFunctionDefinition()) { 10274 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10275 } 10276 10277 // - There's a non-dependent scope specifier, in which case we 10278 // compute it and do a previous lookup there for a function 10279 // or function template. 10280 } else if (!SS.getScopeRep()->isDependent()) { 10281 DC = computeDeclContext(SS); 10282 if (!DC) return 0; 10283 10284 if (RequireCompleteDeclContext(SS, DC)) return 0; 10285 10286 LookupQualifiedName(Previous, DC); 10287 10288 // Ignore things found implicitly in the wrong scope. 10289 // TODO: better diagnostics for this case. Suggesting the right 10290 // qualified scope would be nice... 10291 LookupResult::Filter F = Previous.makeFilter(); 10292 while (F.hasNext()) { 10293 NamedDecl *D = F.next(); 10294 if (!DC->InEnclosingNamespaceSetOf( 10295 D->getDeclContext()->getRedeclContext())) 10296 F.erase(); 10297 } 10298 F.done(); 10299 10300 if (Previous.empty()) { 10301 D.setInvalidType(); 10302 Diag(Loc, diag::err_qualified_friend_not_found) 10303 << Name << TInfo->getType(); 10304 return 0; 10305 } 10306 10307 // C++ [class.friend]p1: A friend of a class is a function or 10308 // class that is not a member of the class . . . 10309 if (DC->Equals(CurContext)) 10310 Diag(DS.getFriendSpecLoc(), 10311 getLangOpts().CPlusPlus0x ? 10312 diag::warn_cxx98_compat_friend_is_member : 10313 diag::err_friend_is_member); 10314 10315 if (D.isFunctionDefinition()) { 10316 // C++ [class.friend]p6: 10317 // A function can be defined in a friend declaration of a class if and 10318 // only if the class is a non-local class (9.8), the function name is 10319 // unqualified, and the function has namespace scope. 10320 SemaDiagnosticBuilder DB 10321 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10322 10323 DB << SS.getScopeRep(); 10324 if (DC->isFileContext()) 10325 DB << FixItHint::CreateRemoval(SS.getRange()); 10326 SS.clear(); 10327 } 10328 10329 // - There's a scope specifier that does not match any template 10330 // parameter lists, in which case we use some arbitrary context, 10331 // create a method or method template, and wait for instantiation. 10332 // - There's a scope specifier that does match some template 10333 // parameter lists, which we don't handle right now. 10334 } else { 10335 if (D.isFunctionDefinition()) { 10336 // C++ [class.friend]p6: 10337 // A function can be defined in a friend declaration of a class if and 10338 // only if the class is a non-local class (9.8), the function name is 10339 // unqualified, and the function has namespace scope. 10340 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10341 << SS.getScopeRep(); 10342 } 10343 10344 DC = CurContext; 10345 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10346 } 10347 10348 if (!DC->isRecord()) { 10349 // This implies that it has to be an operator or function. 10350 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10351 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10352 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10353 Diag(Loc, diag::err_introducing_special_friend) << 10354 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10355 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10356 return 0; 10357 } 10358 } 10359 10360 // FIXME: This is an egregious hack to cope with cases where the scope stack 10361 // does not contain the declaration context, i.e., in an out-of-line 10362 // definition of a class. 10363 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10364 if (!DCScope) { 10365 FakeDCScope.setEntity(DC); 10366 DCScope = &FakeDCScope; 10367 } 10368 10369 bool AddToScope = true; 10370 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10371 move(TemplateParams), AddToScope); 10372 if (!ND) return 0; 10373 10374 assert(ND->getDeclContext() == DC); 10375 assert(ND->getLexicalDeclContext() == CurContext); 10376 10377 // Add the function declaration to the appropriate lookup tables, 10378 // adjusting the redeclarations list as necessary. We don't 10379 // want to do this yet if the friending class is dependent. 10380 // 10381 // Also update the scope-based lookup if the target context's 10382 // lookup context is in lexical scope. 10383 if (!CurContext->isDependentContext()) { 10384 DC = DC->getRedeclContext(); 10385 DC->makeDeclVisibleInContext(ND); 10386 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10387 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10388 } 10389 10390 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10391 D.getIdentifierLoc(), ND, 10392 DS.getFriendSpecLoc()); 10393 FrD->setAccess(AS_public); 10394 CurContext->addDecl(FrD); 10395 10396 if (ND->isInvalidDecl()) 10397 FrD->setInvalidDecl(); 10398 else { 10399 FunctionDecl *FD; 10400 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10401 FD = FTD->getTemplatedDecl(); 10402 else 10403 FD = cast<FunctionDecl>(ND); 10404 10405 // Mark templated-scope function declarations as unsupported. 10406 if (FD->getNumTemplateParameterLists()) 10407 FrD->setUnsupportedFriend(true); 10408 } 10409 10410 return ND; 10411} 10412 10413void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10414 AdjustDeclIfTemplate(Dcl); 10415 10416 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10417 if (!Fn) { 10418 Diag(DelLoc, diag::err_deleted_non_function); 10419 return; 10420 } 10421 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10422 Diag(DelLoc, diag::err_deleted_decl_not_first); 10423 Diag(Prev->getLocation(), diag::note_previous_declaration); 10424 // If the declaration wasn't the first, we delete the function anyway for 10425 // recovery. 10426 } 10427 Fn->setDeletedAsWritten(); 10428 10429 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10430 if (!MD) 10431 return; 10432 10433 // A deleted special member function is trivial if the corresponding 10434 // implicitly-declared function would have been. 10435 switch (getSpecialMember(MD)) { 10436 case CXXInvalid: 10437 break; 10438 case CXXDefaultConstructor: 10439 MD->setTrivial(MD->getParent()->hasTrivialDefaultConstructor()); 10440 break; 10441 case CXXCopyConstructor: 10442 MD->setTrivial(MD->getParent()->hasTrivialCopyConstructor()); 10443 break; 10444 case CXXMoveConstructor: 10445 MD->setTrivial(MD->getParent()->hasTrivialMoveConstructor()); 10446 break; 10447 case CXXCopyAssignment: 10448 MD->setTrivial(MD->getParent()->hasTrivialCopyAssignment()); 10449 break; 10450 case CXXMoveAssignment: 10451 MD->setTrivial(MD->getParent()->hasTrivialMoveAssignment()); 10452 break; 10453 case CXXDestructor: 10454 MD->setTrivial(MD->getParent()->hasTrivialDestructor()); 10455 break; 10456 } 10457} 10458 10459void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10460 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10461 10462 if (MD) { 10463 if (MD->getParent()->isDependentType()) { 10464 MD->setDefaulted(); 10465 MD->setExplicitlyDefaulted(); 10466 return; 10467 } 10468 10469 CXXSpecialMember Member = getSpecialMember(MD); 10470 if (Member == CXXInvalid) { 10471 Diag(DefaultLoc, diag::err_default_special_members); 10472 return; 10473 } 10474 10475 MD->setDefaulted(); 10476 MD->setExplicitlyDefaulted(); 10477 10478 // If this definition appears within the record, do the checking when 10479 // the record is complete. 10480 const FunctionDecl *Primary = MD; 10481 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10482 // Find the uninstantiated declaration that actually had the '= default' 10483 // on it. 10484 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10485 10486 if (Primary == Primary->getCanonicalDecl()) 10487 return; 10488 10489 switch (Member) { 10490 case CXXDefaultConstructor: { 10491 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10492 CheckExplicitlyDefaultedDefaultConstructor(CD); 10493 if (!CD->isInvalidDecl()) 10494 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10495 break; 10496 } 10497 10498 case CXXCopyConstructor: { 10499 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10500 CheckExplicitlyDefaultedCopyConstructor(CD); 10501 if (!CD->isInvalidDecl()) 10502 DefineImplicitCopyConstructor(DefaultLoc, CD); 10503 break; 10504 } 10505 10506 case CXXCopyAssignment: { 10507 CheckExplicitlyDefaultedCopyAssignment(MD); 10508 if (!MD->isInvalidDecl()) 10509 DefineImplicitCopyAssignment(DefaultLoc, MD); 10510 break; 10511 } 10512 10513 case CXXDestructor: { 10514 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10515 CheckExplicitlyDefaultedDestructor(DD); 10516 if (!DD->isInvalidDecl()) 10517 DefineImplicitDestructor(DefaultLoc, DD); 10518 break; 10519 } 10520 10521 case CXXMoveConstructor: { 10522 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10523 CheckExplicitlyDefaultedMoveConstructor(CD); 10524 if (!CD->isInvalidDecl()) 10525 DefineImplicitMoveConstructor(DefaultLoc, CD); 10526 break; 10527 } 10528 10529 case CXXMoveAssignment: { 10530 CheckExplicitlyDefaultedMoveAssignment(MD); 10531 if (!MD->isInvalidDecl()) 10532 DefineImplicitMoveAssignment(DefaultLoc, MD); 10533 break; 10534 } 10535 10536 case CXXInvalid: 10537 llvm_unreachable("Invalid special member."); 10538 } 10539 } else { 10540 Diag(DefaultLoc, diag::err_default_special_members); 10541 } 10542} 10543 10544static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10545 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10546 Stmt *SubStmt = *CI; 10547 if (!SubStmt) 10548 continue; 10549 if (isa<ReturnStmt>(SubStmt)) 10550 Self.Diag(SubStmt->getLocStart(), 10551 diag::err_return_in_constructor_handler); 10552 if (!isa<Expr>(SubStmt)) 10553 SearchForReturnInStmt(Self, SubStmt); 10554 } 10555} 10556 10557void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10558 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10559 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10560 SearchForReturnInStmt(*this, Handler); 10561 } 10562} 10563 10564bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10565 const CXXMethodDecl *Old) { 10566 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10567 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10568 10569 if (Context.hasSameType(NewTy, OldTy) || 10570 NewTy->isDependentType() || OldTy->isDependentType()) 10571 return false; 10572 10573 // Check if the return types are covariant 10574 QualType NewClassTy, OldClassTy; 10575 10576 /// Both types must be pointers or references to classes. 10577 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10578 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10579 NewClassTy = NewPT->getPointeeType(); 10580 OldClassTy = OldPT->getPointeeType(); 10581 } 10582 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10583 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10584 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10585 NewClassTy = NewRT->getPointeeType(); 10586 OldClassTy = OldRT->getPointeeType(); 10587 } 10588 } 10589 } 10590 10591 // The return types aren't either both pointers or references to a class type. 10592 if (NewClassTy.isNull()) { 10593 Diag(New->getLocation(), 10594 diag::err_different_return_type_for_overriding_virtual_function) 10595 << New->getDeclName() << NewTy << OldTy; 10596 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10597 10598 return true; 10599 } 10600 10601 // C++ [class.virtual]p6: 10602 // If the return type of D::f differs from the return type of B::f, the 10603 // class type in the return type of D::f shall be complete at the point of 10604 // declaration of D::f or shall be the class type D. 10605 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10606 if (!RT->isBeingDefined() && 10607 RequireCompleteType(New->getLocation(), NewClassTy, 10608 PDiag(diag::err_covariant_return_incomplete) 10609 << New->getDeclName())) 10610 return true; 10611 } 10612 10613 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10614 // Check if the new class derives from the old class. 10615 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10616 Diag(New->getLocation(), 10617 diag::err_covariant_return_not_derived) 10618 << New->getDeclName() << NewTy << OldTy; 10619 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10620 return true; 10621 } 10622 10623 // Check if we the conversion from derived to base is valid. 10624 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10625 diag::err_covariant_return_inaccessible_base, 10626 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10627 // FIXME: Should this point to the return type? 10628 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10629 // FIXME: this note won't trigger for delayed access control 10630 // diagnostics, and it's impossible to get an undelayed error 10631 // here from access control during the original parse because 10632 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10633 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10634 return true; 10635 } 10636 } 10637 10638 // The qualifiers of the return types must be the same. 10639 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10640 Diag(New->getLocation(), 10641 diag::err_covariant_return_type_different_qualifications) 10642 << New->getDeclName() << NewTy << OldTy; 10643 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10644 return true; 10645 }; 10646 10647 10648 // The new class type must have the same or less qualifiers as the old type. 10649 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10650 Diag(New->getLocation(), 10651 diag::err_covariant_return_type_class_type_more_qualified) 10652 << New->getDeclName() << NewTy << OldTy; 10653 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10654 return true; 10655 }; 10656 10657 return false; 10658} 10659 10660/// \brief Mark the given method pure. 10661/// 10662/// \param Method the method to be marked pure. 10663/// 10664/// \param InitRange the source range that covers the "0" initializer. 10665bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10666 SourceLocation EndLoc = InitRange.getEnd(); 10667 if (EndLoc.isValid()) 10668 Method->setRangeEnd(EndLoc); 10669 10670 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10671 Method->setPure(); 10672 return false; 10673 } 10674 10675 if (!Method->isInvalidDecl()) 10676 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10677 << Method->getDeclName() << InitRange; 10678 return true; 10679} 10680 10681/// \brief Determine whether the given declaration is a static data member. 10682static bool isStaticDataMember(Decl *D) { 10683 VarDecl *Var = dyn_cast_or_null<VarDecl>(D); 10684 if (!Var) 10685 return false; 10686 10687 return Var->isStaticDataMember(); 10688} 10689/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10690/// an initializer for the out-of-line declaration 'Dcl'. The scope 10691/// is a fresh scope pushed for just this purpose. 10692/// 10693/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10694/// static data member of class X, names should be looked up in the scope of 10695/// class X. 10696void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10697 // If there is no declaration, there was an error parsing it. 10698 if (D == 0 || D->isInvalidDecl()) return; 10699 10700 // We should only get called for declarations with scope specifiers, like: 10701 // int foo::bar; 10702 assert(D->isOutOfLine()); 10703 EnterDeclaratorContext(S, D->getDeclContext()); 10704 10705 // If we are parsing the initializer for a static data member, push a 10706 // new expression evaluation context that is associated with this static 10707 // data member. 10708 if (isStaticDataMember(D)) 10709 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 10710} 10711 10712/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10713/// initializer for the out-of-line declaration 'D'. 10714void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10715 // If there is no declaration, there was an error parsing it. 10716 if (D == 0 || D->isInvalidDecl()) return; 10717 10718 if (isStaticDataMember(D)) 10719 PopExpressionEvaluationContext(); 10720 10721 assert(D->isOutOfLine()); 10722 ExitDeclaratorContext(S); 10723} 10724 10725/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10726/// C++ if/switch/while/for statement. 10727/// e.g: "if (int x = f()) {...}" 10728DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10729 // C++ 6.4p2: 10730 // The declarator shall not specify a function or an array. 10731 // The type-specifier-seq shall not contain typedef and shall not declare a 10732 // new class or enumeration. 10733 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10734 "Parser allowed 'typedef' as storage class of condition decl."); 10735 10736 Decl *Dcl = ActOnDeclarator(S, D); 10737 if (!Dcl) 10738 return true; 10739 10740 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10741 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10742 << D.getSourceRange(); 10743 return true; 10744 } 10745 10746 return Dcl; 10747} 10748 10749void Sema::LoadExternalVTableUses() { 10750 if (!ExternalSource) 10751 return; 10752 10753 SmallVector<ExternalVTableUse, 4> VTables; 10754 ExternalSource->ReadUsedVTables(VTables); 10755 SmallVector<VTableUse, 4> NewUses; 10756 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10757 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10758 = VTablesUsed.find(VTables[I].Record); 10759 // Even if a definition wasn't required before, it may be required now. 10760 if (Pos != VTablesUsed.end()) { 10761 if (!Pos->second && VTables[I].DefinitionRequired) 10762 Pos->second = true; 10763 continue; 10764 } 10765 10766 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10767 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10768 } 10769 10770 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10771} 10772 10773void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10774 bool DefinitionRequired) { 10775 // Ignore any vtable uses in unevaluated operands or for classes that do 10776 // not have a vtable. 10777 if (!Class->isDynamicClass() || Class->isDependentContext() || 10778 CurContext->isDependentContext() || 10779 ExprEvalContexts.back().Context == Unevaluated) 10780 return; 10781 10782 // Try to insert this class into the map. 10783 LoadExternalVTableUses(); 10784 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10785 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10786 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10787 if (!Pos.second) { 10788 // If we already had an entry, check to see if we are promoting this vtable 10789 // to required a definition. If so, we need to reappend to the VTableUses 10790 // list, since we may have already processed the first entry. 10791 if (DefinitionRequired && !Pos.first->second) { 10792 Pos.first->second = true; 10793 } else { 10794 // Otherwise, we can early exit. 10795 return; 10796 } 10797 } 10798 10799 // Local classes need to have their virtual members marked 10800 // immediately. For all other classes, we mark their virtual members 10801 // at the end of the translation unit. 10802 if (Class->isLocalClass()) 10803 MarkVirtualMembersReferenced(Loc, Class); 10804 else 10805 VTableUses.push_back(std::make_pair(Class, Loc)); 10806} 10807 10808bool Sema::DefineUsedVTables() { 10809 LoadExternalVTableUses(); 10810 if (VTableUses.empty()) 10811 return false; 10812 10813 // Note: The VTableUses vector could grow as a result of marking 10814 // the members of a class as "used", so we check the size each 10815 // time through the loop and prefer indices (with are stable) to 10816 // iterators (which are not). 10817 bool DefinedAnything = false; 10818 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10819 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10820 if (!Class) 10821 continue; 10822 10823 SourceLocation Loc = VTableUses[I].second; 10824 10825 // If this class has a key function, but that key function is 10826 // defined in another translation unit, we don't need to emit the 10827 // vtable even though we're using it. 10828 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10829 if (KeyFunction && !KeyFunction->hasBody()) { 10830 switch (KeyFunction->getTemplateSpecializationKind()) { 10831 case TSK_Undeclared: 10832 case TSK_ExplicitSpecialization: 10833 case TSK_ExplicitInstantiationDeclaration: 10834 // The key function is in another translation unit. 10835 continue; 10836 10837 case TSK_ExplicitInstantiationDefinition: 10838 case TSK_ImplicitInstantiation: 10839 // We will be instantiating the key function. 10840 break; 10841 } 10842 } else if (!KeyFunction) { 10843 // If we have a class with no key function that is the subject 10844 // of an explicit instantiation declaration, suppress the 10845 // vtable; it will live with the explicit instantiation 10846 // definition. 10847 bool IsExplicitInstantiationDeclaration 10848 = Class->getTemplateSpecializationKind() 10849 == TSK_ExplicitInstantiationDeclaration; 10850 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10851 REnd = Class->redecls_end(); 10852 R != REnd; ++R) { 10853 TemplateSpecializationKind TSK 10854 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10855 if (TSK == TSK_ExplicitInstantiationDeclaration) 10856 IsExplicitInstantiationDeclaration = true; 10857 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10858 IsExplicitInstantiationDeclaration = false; 10859 break; 10860 } 10861 } 10862 10863 if (IsExplicitInstantiationDeclaration) 10864 continue; 10865 } 10866 10867 // Mark all of the virtual members of this class as referenced, so 10868 // that we can build a vtable. Then, tell the AST consumer that a 10869 // vtable for this class is required. 10870 DefinedAnything = true; 10871 MarkVirtualMembersReferenced(Loc, Class); 10872 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10873 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10874 10875 // Optionally warn if we're emitting a weak vtable. 10876 if (Class->getLinkage() == ExternalLinkage && 10877 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10878 const FunctionDecl *KeyFunctionDef = 0; 10879 if (!KeyFunction || 10880 (KeyFunction->hasBody(KeyFunctionDef) && 10881 KeyFunctionDef->isInlined())) 10882 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10883 TSK_ExplicitInstantiationDefinition 10884 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10885 << Class; 10886 } 10887 } 10888 VTableUses.clear(); 10889 10890 return DefinedAnything; 10891} 10892 10893void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10894 const CXXRecordDecl *RD) { 10895 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10896 e = RD->method_end(); i != e; ++i) { 10897 CXXMethodDecl *MD = *i; 10898 10899 // C++ [basic.def.odr]p2: 10900 // [...] A virtual member function is used if it is not pure. [...] 10901 if (MD->isVirtual() && !MD->isPure()) 10902 MarkFunctionReferenced(Loc, MD); 10903 } 10904 10905 // Only classes that have virtual bases need a VTT. 10906 if (RD->getNumVBases() == 0) 10907 return; 10908 10909 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10910 e = RD->bases_end(); i != e; ++i) { 10911 const CXXRecordDecl *Base = 10912 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10913 if (Base->getNumVBases() == 0) 10914 continue; 10915 MarkVirtualMembersReferenced(Loc, Base); 10916 } 10917} 10918 10919/// SetIvarInitializers - This routine builds initialization ASTs for the 10920/// Objective-C implementation whose ivars need be initialized. 10921void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10922 if (!getLangOpts().CPlusPlus) 10923 return; 10924 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10925 SmallVector<ObjCIvarDecl*, 8> ivars; 10926 CollectIvarsToConstructOrDestruct(OID, ivars); 10927 if (ivars.empty()) 10928 return; 10929 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10930 for (unsigned i = 0; i < ivars.size(); i++) { 10931 FieldDecl *Field = ivars[i]; 10932 if (Field->isInvalidDecl()) 10933 continue; 10934 10935 CXXCtorInitializer *Member; 10936 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10937 InitializationKind InitKind = 10938 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10939 10940 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10941 ExprResult MemberInit = 10942 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10943 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10944 // Note, MemberInit could actually come back empty if no initialization 10945 // is required (e.g., because it would call a trivial default constructor) 10946 if (!MemberInit.get() || MemberInit.isInvalid()) 10947 continue; 10948 10949 Member = 10950 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10951 SourceLocation(), 10952 MemberInit.takeAs<Expr>(), 10953 SourceLocation()); 10954 AllToInit.push_back(Member); 10955 10956 // Be sure that the destructor is accessible and is marked as referenced. 10957 if (const RecordType *RecordTy 10958 = Context.getBaseElementType(Field->getType()) 10959 ->getAs<RecordType>()) { 10960 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10961 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10962 MarkFunctionReferenced(Field->getLocation(), Destructor); 10963 CheckDestructorAccess(Field->getLocation(), Destructor, 10964 PDiag(diag::err_access_dtor_ivar) 10965 << Context.getBaseElementType(Field->getType())); 10966 } 10967 } 10968 } 10969 ObjCImplementation->setIvarInitializers(Context, 10970 AllToInit.data(), AllToInit.size()); 10971 } 10972} 10973 10974static 10975void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10976 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10977 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10978 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10979 Sema &S) { 10980 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10981 CE = Current.end(); 10982 if (Ctor->isInvalidDecl()) 10983 return; 10984 10985 const FunctionDecl *FNTarget = 0; 10986 CXXConstructorDecl *Target; 10987 10988 // We ignore the result here since if we don't have a body, Target will be 10989 // null below. 10990 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10991 Target 10992= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10993 10994 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10995 // Avoid dereferencing a null pointer here. 10996 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10997 10998 if (!Current.insert(Canonical)) 10999 return; 11000 11001 // We know that beyond here, we aren't chaining into a cycle. 11002 if (!Target || !Target->isDelegatingConstructor() || 11003 Target->isInvalidDecl() || Valid.count(TCanonical)) { 11004 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11005 Valid.insert(*CI); 11006 Current.clear(); 11007 // We've hit a cycle. 11008 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 11009 Current.count(TCanonical)) { 11010 // If we haven't diagnosed this cycle yet, do so now. 11011 if (!Invalid.count(TCanonical)) { 11012 S.Diag((*Ctor->init_begin())->getSourceLocation(), 11013 diag::warn_delegating_ctor_cycle) 11014 << Ctor; 11015 11016 // Don't add a note for a function delegating directo to itself. 11017 if (TCanonical != Canonical) 11018 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 11019 11020 CXXConstructorDecl *C = Target; 11021 while (C->getCanonicalDecl() != Canonical) { 11022 (void)C->getTargetConstructor()->hasBody(FNTarget); 11023 assert(FNTarget && "Ctor cycle through bodiless function"); 11024 11025 C 11026 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 11027 S.Diag(C->getLocation(), diag::note_which_delegates_to); 11028 } 11029 } 11030 11031 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11032 Invalid.insert(*CI); 11033 Current.clear(); 11034 } else { 11035 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 11036 } 11037} 11038 11039 11040void Sema::CheckDelegatingCtorCycles() { 11041 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 11042 11043 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11044 CE = Current.end(); 11045 11046 for (DelegatingCtorDeclsType::iterator 11047 I = DelegatingCtorDecls.begin(ExternalSource), 11048 E = DelegatingCtorDecls.end(); 11049 I != E; ++I) { 11050 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 11051 } 11052 11053 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 11054 (*CI)->setInvalidDecl(); 11055} 11056 11057namespace { 11058 /// \brief AST visitor that finds references to the 'this' expression. 11059 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { 11060 Sema &S; 11061 11062 public: 11063 explicit FindCXXThisExpr(Sema &S) : S(S) { } 11064 11065 bool VisitCXXThisExpr(CXXThisExpr *E) { 11066 S.Diag(E->getLocation(), diag::err_this_static_member_func) 11067 << E->isImplicit(); 11068 return false; 11069 } 11070 }; 11071} 11072 11073bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { 11074 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11075 if (!TSInfo) 11076 return false; 11077 11078 TypeLoc TL = TSInfo->getTypeLoc(); 11079 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11080 if (!ProtoTL) 11081 return false; 11082 11083 // C++11 [expr.prim.general]p3: 11084 // [The expression this] shall not appear before the optional 11085 // cv-qualifier-seq and it shall not appear within the declaration of a 11086 // static member function (although its type and value category are defined 11087 // within a static member function as they are within a non-static member 11088 // function). [ Note: this is because declaration matching does not occur 11089 // until the complete declarator is known. — end note ] 11090 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11091 FindCXXThisExpr Finder(*this); 11092 11093 // If the return type came after the cv-qualifier-seq, check it now. 11094 if (Proto->hasTrailingReturn() && 11095 !Finder.TraverseTypeLoc(ProtoTL->getResultLoc())) 11096 return true; 11097 11098 // Check the exception specification. 11099 if (checkThisInStaticMemberFunctionExceptionSpec(Method)) 11100 return true; 11101 11102 return checkThisInStaticMemberFunctionAttributes(Method); 11103} 11104 11105bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { 11106 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11107 if (!TSInfo) 11108 return false; 11109 11110 TypeLoc TL = TSInfo->getTypeLoc(); 11111 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11112 if (!ProtoTL) 11113 return false; 11114 11115 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11116 FindCXXThisExpr Finder(*this); 11117 11118 switch (Proto->getExceptionSpecType()) { 11119 case EST_BasicNoexcept: 11120 case EST_Delayed: 11121 case EST_DynamicNone: 11122 case EST_MSAny: 11123 case EST_None: 11124 break; 11125 11126 case EST_ComputedNoexcept: 11127 if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) 11128 return true; 11129 11130 case EST_Dynamic: 11131 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 11132 EEnd = Proto->exception_end(); 11133 E != EEnd; ++E) { 11134 if (!Finder.TraverseType(*E)) 11135 return true; 11136 } 11137 break; 11138 } 11139 11140 return false; 11141} 11142 11143bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { 11144 FindCXXThisExpr Finder(*this); 11145 11146 // Check attributes. 11147 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end(); 11148 A != AEnd; ++A) { 11149 // FIXME: This should be emitted by tblgen. 11150 Expr *Arg = 0; 11151 ArrayRef<Expr *> Args; 11152 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A)) 11153 Arg = G->getArg(); 11154 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A)) 11155 Arg = G->getArg(); 11156 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A)) 11157 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size()); 11158 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A)) 11159 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size()); 11160 else if (ExclusiveLockFunctionAttr *ELF 11161 = dyn_cast<ExclusiveLockFunctionAttr>(*A)) 11162 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size()); 11163 else if (SharedLockFunctionAttr *SLF 11164 = dyn_cast<SharedLockFunctionAttr>(*A)) 11165 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size()); 11166 else if (ExclusiveTrylockFunctionAttr *ETLF 11167 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) { 11168 Arg = ETLF->getSuccessValue(); 11169 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size()); 11170 } else if (SharedTrylockFunctionAttr *STLF 11171 = dyn_cast<SharedTrylockFunctionAttr>(*A)) { 11172 Arg = STLF->getSuccessValue(); 11173 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size()); 11174 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A)) 11175 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size()); 11176 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A)) 11177 Arg = LR->getArg(); 11178 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A)) 11179 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size()); 11180 else if (ExclusiveLocksRequiredAttr *ELR 11181 = dyn_cast<ExclusiveLocksRequiredAttr>(*A)) 11182 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size()); 11183 else if (SharedLocksRequiredAttr *SLR 11184 = dyn_cast<SharedLocksRequiredAttr>(*A)) 11185 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size()); 11186 11187 if (Arg && !Finder.TraverseStmt(Arg)) 11188 return true; 11189 11190 for (unsigned I = 0, N = Args.size(); I != N; ++I) { 11191 if (!Finder.TraverseStmt(Args[I])) 11192 return true; 11193 } 11194 } 11195 11196 return false; 11197} 11198 11199void 11200Sema::checkExceptionSpecification(ExceptionSpecificationType EST, 11201 ArrayRef<ParsedType> DynamicExceptions, 11202 ArrayRef<SourceRange> DynamicExceptionRanges, 11203 Expr *NoexceptExpr, 11204 llvm::SmallVectorImpl<QualType> &Exceptions, 11205 FunctionProtoType::ExtProtoInfo &EPI) { 11206 Exceptions.clear(); 11207 EPI.ExceptionSpecType = EST; 11208 if (EST == EST_Dynamic) { 11209 Exceptions.reserve(DynamicExceptions.size()); 11210 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { 11211 // FIXME: Preserve type source info. 11212 QualType ET = GetTypeFromParser(DynamicExceptions[ei]); 11213 11214 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 11215 collectUnexpandedParameterPacks(ET, Unexpanded); 11216 if (!Unexpanded.empty()) { 11217 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(), 11218 UPPC_ExceptionType, 11219 Unexpanded); 11220 continue; 11221 } 11222 11223 // Check that the type is valid for an exception spec, and 11224 // drop it if not. 11225 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) 11226 Exceptions.push_back(ET); 11227 } 11228 EPI.NumExceptions = Exceptions.size(); 11229 EPI.Exceptions = Exceptions.data(); 11230 return; 11231 } 11232 11233 if (EST == EST_ComputedNoexcept) { 11234 // If an error occurred, there's no expression here. 11235 if (NoexceptExpr) { 11236 assert((NoexceptExpr->isTypeDependent() || 11237 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 11238 Context.BoolTy) && 11239 "Parser should have made sure that the expression is boolean"); 11240 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { 11241 EPI.ExceptionSpecType = EST_BasicNoexcept; 11242 return; 11243 } 11244 11245 if (!NoexceptExpr->isValueDependent()) 11246 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0, 11247 PDiag(diag::err_noexcept_needs_constant_expression), 11248 /*AllowFold*/ false).take(); 11249 EPI.NoexceptExpr = NoexceptExpr; 11250 } 11251 return; 11252 } 11253} 11254 11255void Sema::actOnDelayedExceptionSpecification(Decl *MethodD, 11256 ExceptionSpecificationType EST, 11257 SourceRange SpecificationRange, 11258 ArrayRef<ParsedType> DynamicExceptions, 11259 ArrayRef<SourceRange> DynamicExceptionRanges, 11260 Expr *NoexceptExpr) { 11261 if (!MethodD) 11262 return; 11263 11264 // Dig out the method we're referring to. 11265 CXXMethodDecl *Method = 0; 11266 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(MethodD)) 11267 Method = dyn_cast<CXXMethodDecl>(FunTmpl->getTemplatedDecl()); 11268 else 11269 Method = dyn_cast<CXXMethodDecl>(MethodD); 11270 11271 if (!Method) 11272 return; 11273 11274 // Dig out the prototype. This should never fail. 11275 const FunctionProtoType *Proto 11276 = dyn_cast<FunctionProtoType>(Method->getType()); 11277 if (!Proto) 11278 return; 11279 11280 // Check the exception specification. 11281 llvm::SmallVector<QualType, 4> Exceptions; 11282 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 11283 checkExceptionSpecification(EST, DynamicExceptions, DynamicExceptionRanges, 11284 NoexceptExpr, Exceptions, EPI); 11285 11286 // Rebuild the function type. 11287 QualType T = Context.getFunctionType(Proto->getResultType(), 11288 Proto->arg_type_begin(), 11289 Proto->getNumArgs(), 11290 EPI); 11291 if (TypeSourceInfo *TSInfo = Method->getTypeSourceInfo()) { 11292 // FIXME: When we get proper type location information for exceptions, 11293 // we'll also have to rebuild the TypeSourceInfo. For now, we just patch 11294 // up the TypeSourceInfo; 11295 assert(TypeLoc::getFullDataSizeForType(T) 11296 == TypeLoc::getFullDataSizeForType(Method->getType()) && 11297 "TypeLoc size mismatch with delayed exception specification"); 11298 TSInfo->overrideType(T); 11299 } 11300 11301 Method->setType(T); 11302 11303 if (Method->isStatic()) 11304 checkThisInStaticMemberFunctionExceptionSpec(Method); 11305 11306 if (Method->isVirtual()) { 11307 // Check overrides, which we previously had to delay. 11308 for (CXXMethodDecl::method_iterator O = Method->begin_overridden_methods(), 11309 OEnd = Method->end_overridden_methods(); 11310 O != OEnd; ++O) 11311 CheckOverridingFunctionExceptionSpec(Method, *O); 11312 } 11313} 11314 11315/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 11316Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 11317 // Implicitly declared functions (e.g. copy constructors) are 11318 // __host__ __device__ 11319 if (D->isImplicit()) 11320 return CFT_HostDevice; 11321 11322 if (D->hasAttr<CUDAGlobalAttr>()) 11323 return CFT_Global; 11324 11325 if (D->hasAttr<CUDADeviceAttr>()) { 11326 if (D->hasAttr<CUDAHostAttr>()) 11327 return CFT_HostDevice; 11328 else 11329 return CFT_Device; 11330 } 11331 11332 return CFT_Host; 11333} 11334 11335bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 11336 CUDAFunctionTarget CalleeTarget) { 11337 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 11338 // Callable from the device only." 11339 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 11340 return true; 11341 11342 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 11343 // Callable from the host only." 11344 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 11345 // Callable from the host only." 11346 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 11347 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 11348 return true; 11349 11350 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 11351 return true; 11352 11353 return false; 11354} 11355