SemaDeclCXX.cpp revision 33deb35535aebe81bed0eaf5c14f3032276a086e
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/Sema/ScopeInfo.h" 20#include "clang/AST/ASTConsumer.h" 21#include "clang/AST/ASTContext.h" 22#include "clang/AST/ASTMutationListener.h" 23#include "clang/AST/CharUnits.h" 24#include "clang/AST/CXXInheritance.h" 25#include "clang/AST/DeclVisitor.h" 26#include "clang/AST/ExprCXX.h" 27#include "clang/AST/RecordLayout.h" 28#include "clang/AST/StmtVisitor.h" 29#include "clang/AST/TypeLoc.h" 30#include "clang/AST/TypeOrdering.h" 31#include "clang/Sema/DeclSpec.h" 32#include "clang/Sema/ParsedTemplate.h" 33#include "clang/Basic/PartialDiagnostic.h" 34#include "clang/Lex/Preprocessor.h" 35#include "llvm/ADT/DenseSet.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->getSourceRange().getBegin(), 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->getSourceRange().getBegin(), 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->getSourceRange().getBegin(), 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 (!getLangOptions().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 bool Invalid = false; 378 379 // C++ [dcl.fct.default]p4: 380 // For non-template functions, default arguments can be added in 381 // later declarations of a function in the same 382 // scope. Declarations in different scopes have completely 383 // distinct sets of default arguments. That is, declarations in 384 // inner scopes do not acquire default arguments from 385 // declarations in outer scopes, and vice versa. In a given 386 // function declaration, all parameters subsequent to a 387 // parameter with a default argument shall have default 388 // arguments supplied in this or previous declarations. A 389 // default argument shall not be redefined by a later 390 // declaration (not even to the same value). 391 // 392 // C++ [dcl.fct.default]p6: 393 // Except for member functions of class templates, the default arguments 394 // in a member function definition that appears outside of the class 395 // definition are added to the set of default arguments provided by the 396 // member function declaration in the class definition. 397 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 398 ParmVarDecl *OldParam = Old->getParamDecl(p); 399 ParmVarDecl *NewParam = New->getParamDecl(p); 400 401 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 402 403 unsigned DiagDefaultParamID = 404 diag::err_param_default_argument_redefinition; 405 406 // MSVC accepts that default parameters be redefined for member functions 407 // of template class. The new default parameter's value is ignored. 408 Invalid = true; 409 if (getLangOptions().MicrosoftExt) { 410 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 411 if (MD && MD->getParent()->getDescribedClassTemplate()) { 412 // Merge the old default argument into the new parameter. 413 NewParam->setHasInheritedDefaultArg(); 414 if (OldParam->hasUninstantiatedDefaultArg()) 415 NewParam->setUninstantiatedDefaultArg( 416 OldParam->getUninstantiatedDefaultArg()); 417 else 418 NewParam->setDefaultArg(OldParam->getInit()); 419 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 420 Invalid = false; 421 } 422 } 423 424 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 425 // hint here. Alternatively, we could walk the type-source information 426 // for NewParam to find the last source location in the type... but it 427 // isn't worth the effort right now. This is the kind of test case that 428 // is hard to get right: 429 // int f(int); 430 // void g(int (*fp)(int) = f); 431 // void g(int (*fp)(int) = &f); 432 Diag(NewParam->getLocation(), DiagDefaultParamID) 433 << NewParam->getDefaultArgRange(); 434 435 // Look for the function declaration where the default argument was 436 // actually written, which may be a declaration prior to Old. 437 for (FunctionDecl *Older = Old->getPreviousDecl(); 438 Older; Older = Older->getPreviousDecl()) { 439 if (!Older->getParamDecl(p)->hasDefaultArg()) 440 break; 441 442 OldParam = Older->getParamDecl(p); 443 } 444 445 Diag(OldParam->getLocation(), diag::note_previous_definition) 446 << OldParam->getDefaultArgRange(); 447 } else if (OldParam->hasDefaultArg()) { 448 // Merge the old default argument into the new parameter. 449 // It's important to use getInit() here; getDefaultArg() 450 // strips off any top-level ExprWithCleanups. 451 NewParam->setHasInheritedDefaultArg(); 452 if (OldParam->hasUninstantiatedDefaultArg()) 453 NewParam->setUninstantiatedDefaultArg( 454 OldParam->getUninstantiatedDefaultArg()); 455 else 456 NewParam->setDefaultArg(OldParam->getInit()); 457 } else if (NewParam->hasDefaultArg()) { 458 if (New->getDescribedFunctionTemplate()) { 459 // Paragraph 4, quoted above, only applies to non-template functions. 460 Diag(NewParam->getLocation(), 461 diag::err_param_default_argument_template_redecl) 462 << NewParam->getDefaultArgRange(); 463 Diag(Old->getLocation(), diag::note_template_prev_declaration) 464 << false; 465 } else if (New->getTemplateSpecializationKind() 466 != TSK_ImplicitInstantiation && 467 New->getTemplateSpecializationKind() != TSK_Undeclared) { 468 // C++ [temp.expr.spec]p21: 469 // Default function arguments shall not be specified in a declaration 470 // or a definition for one of the following explicit specializations: 471 // - the explicit specialization of a function template; 472 // - the explicit specialization of a member function template; 473 // - the explicit specialization of a member function of a class 474 // template where the class template specialization to which the 475 // member function specialization belongs is implicitly 476 // instantiated. 477 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 478 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 479 << New->getDeclName() 480 << NewParam->getDefaultArgRange(); 481 } else if (New->getDeclContext()->isDependentContext()) { 482 // C++ [dcl.fct.default]p6 (DR217): 483 // Default arguments for a member function of a class template shall 484 // be specified on the initial declaration of the member function 485 // within the class template. 486 // 487 // Reading the tea leaves a bit in DR217 and its reference to DR205 488 // leads me to the conclusion that one cannot add default function 489 // arguments for an out-of-line definition of a member function of a 490 // dependent type. 491 int WhichKind = 2; 492 if (CXXRecordDecl *Record 493 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 494 if (Record->getDescribedClassTemplate()) 495 WhichKind = 0; 496 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 497 WhichKind = 1; 498 else 499 WhichKind = 2; 500 } 501 502 Diag(NewParam->getLocation(), 503 diag::err_param_default_argument_member_template_redecl) 504 << WhichKind 505 << NewParam->getDefaultArgRange(); 506 } else if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(New)) { 507 CXXSpecialMember NewSM = getSpecialMember(Ctor), 508 OldSM = getSpecialMember(cast<CXXConstructorDecl>(Old)); 509 if (NewSM != OldSM) { 510 Diag(NewParam->getLocation(),diag::warn_default_arg_makes_ctor_special) 511 << NewParam->getDefaultArgRange() << NewSM; 512 Diag(Old->getLocation(), diag::note_previous_declaration_special) 513 << OldSM; 514 } 515 } 516 } 517 } 518 519 // C++11 [dcl.constexpr]p1: If any declaration of a function or function 520 // template has a constexpr specifier then all its declarations shall 521 // contain the constexpr specifier. 522 if (New->isConstexpr() != Old->isConstexpr()) { 523 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 524 << New << New->isConstexpr(); 525 Diag(Old->getLocation(), diag::note_previous_declaration); 526 Invalid = true; 527 } 528 529 if (CheckEquivalentExceptionSpec(Old, New)) 530 Invalid = true; 531 532 return Invalid; 533} 534 535/// \brief Merge the exception specifications of two variable declarations. 536/// 537/// This is called when there's a redeclaration of a VarDecl. The function 538/// checks if the redeclaration might have an exception specification and 539/// validates compatibility and merges the specs if necessary. 540void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 541 // Shortcut if exceptions are disabled. 542 if (!getLangOptions().CXXExceptions) 543 return; 544 545 assert(Context.hasSameType(New->getType(), Old->getType()) && 546 "Should only be called if types are otherwise the same."); 547 548 QualType NewType = New->getType(); 549 QualType OldType = Old->getType(); 550 551 // We're only interested in pointers and references to functions, as well 552 // as pointers to member functions. 553 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 554 NewType = R->getPointeeType(); 555 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 556 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 557 NewType = P->getPointeeType(); 558 OldType = OldType->getAs<PointerType>()->getPointeeType(); 559 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 560 NewType = M->getPointeeType(); 561 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 562 } 563 564 if (!NewType->isFunctionProtoType()) 565 return; 566 567 // There's lots of special cases for functions. For function pointers, system 568 // libraries are hopefully not as broken so that we don't need these 569 // workarounds. 570 if (CheckEquivalentExceptionSpec( 571 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 572 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 573 New->setInvalidDecl(); 574 } 575} 576 577/// CheckCXXDefaultArguments - Verify that the default arguments for a 578/// function declaration are well-formed according to C++ 579/// [dcl.fct.default]. 580void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 581 unsigned NumParams = FD->getNumParams(); 582 unsigned p; 583 584 bool IsLambda = FD->getOverloadedOperator() == OO_Call && 585 isa<CXXMethodDecl>(FD) && 586 cast<CXXMethodDecl>(FD)->getParent()->isLambda(); 587 588 // Find first parameter with a default argument 589 for (p = 0; p < NumParams; ++p) { 590 ParmVarDecl *Param = FD->getParamDecl(p); 591 if (Param->hasDefaultArg()) { 592 // C++11 [expr.prim.lambda]p5: 593 // [...] Default arguments (8.3.6) shall not be specified in the 594 // parameter-declaration-clause of a lambda-declarator. 595 // 596 // FIXME: Core issue 974 strikes this sentence, we only provide an 597 // extension warning. 598 if (IsLambda) 599 Diag(Param->getLocation(), diag::ext_lambda_default_arguments) 600 << Param->getDefaultArgRange(); 601 break; 602 } 603 } 604 605 // C++ [dcl.fct.default]p4: 606 // In a given function declaration, all parameters 607 // subsequent to a parameter with a default argument shall 608 // have default arguments supplied in this or previous 609 // declarations. A default argument shall not be redefined 610 // by a later declaration (not even to the same value). 611 unsigned LastMissingDefaultArg = 0; 612 for (; p < NumParams; ++p) { 613 ParmVarDecl *Param = FD->getParamDecl(p); 614 if (!Param->hasDefaultArg()) { 615 if (Param->isInvalidDecl()) 616 /* We already complained about this parameter. */; 617 else if (Param->getIdentifier()) 618 Diag(Param->getLocation(), 619 diag::err_param_default_argument_missing_name) 620 << Param->getIdentifier(); 621 else 622 Diag(Param->getLocation(), 623 diag::err_param_default_argument_missing); 624 625 LastMissingDefaultArg = p; 626 } 627 } 628 629 if (LastMissingDefaultArg > 0) { 630 // Some default arguments were missing. Clear out all of the 631 // default arguments up to (and including) the last missing 632 // default argument, so that we leave the function parameters 633 // in a semantically valid state. 634 for (p = 0; p <= LastMissingDefaultArg; ++p) { 635 ParmVarDecl *Param = FD->getParamDecl(p); 636 if (Param->hasDefaultArg()) { 637 Param->setDefaultArg(0); 638 } 639 } 640 } 641} 642 643// CheckConstexprParameterTypes - Check whether a function's parameter types 644// are all literal types. If so, return true. If not, produce a suitable 645// diagnostic and return false. 646static bool CheckConstexprParameterTypes(Sema &SemaRef, 647 const FunctionDecl *FD) { 648 unsigned ArgIndex = 0; 649 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 650 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 651 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 652 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 653 SourceLocation ParamLoc = PD->getLocation(); 654 if (!(*i)->isDependentType() && 655 SemaRef.RequireLiteralType(ParamLoc, *i, 656 SemaRef.PDiag(diag::err_constexpr_non_literal_param) 657 << ArgIndex+1 << PD->getSourceRange() 658 << isa<CXXConstructorDecl>(FD))) 659 return false; 660 } 661 return true; 662} 663 664// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 665// the requirements of a constexpr function definition or a constexpr 666// constructor definition. If so, return true. If not, produce appropriate 667// diagnostics and return false. 668// 669// This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. 670bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) { 671 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 672 if (MD && MD->isInstance()) { 673 // C++11 [dcl.constexpr]p4: 674 // The definition of a constexpr constructor shall satisfy the following 675 // constraints: 676 // - the class shall not have any virtual base classes; 677 const CXXRecordDecl *RD = MD->getParent(); 678 if (RD->getNumVBases()) { 679 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) 680 << isa<CXXConstructorDecl>(NewFD) << RD->isStruct() 681 << RD->getNumVBases(); 682 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 683 E = RD->vbases_end(); I != E; ++I) 684 Diag(I->getSourceRange().getBegin(), 685 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 686 return false; 687 } 688 } 689 690 if (!isa<CXXConstructorDecl>(NewFD)) { 691 // C++11 [dcl.constexpr]p3: 692 // The definition of a constexpr function shall satisfy the following 693 // constraints: 694 // - it shall not be virtual; 695 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 696 if (Method && Method->isVirtual()) { 697 Diag(NewFD->getLocation(), diag::err_constexpr_virtual); 698 699 // If it's not obvious why this function is virtual, find an overridden 700 // function which uses the 'virtual' keyword. 701 const CXXMethodDecl *WrittenVirtual = Method; 702 while (!WrittenVirtual->isVirtualAsWritten()) 703 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 704 if (WrittenVirtual != Method) 705 Diag(WrittenVirtual->getLocation(), 706 diag::note_overridden_virtual_function); 707 return false; 708 } 709 710 // - its return type shall be a literal type; 711 QualType RT = NewFD->getResultType(); 712 if (!RT->isDependentType() && 713 RequireLiteralType(NewFD->getLocation(), RT, 714 PDiag(diag::err_constexpr_non_literal_return))) 715 return false; 716 } 717 718 // - each of its parameter types shall be a literal type; 719 if (!CheckConstexprParameterTypes(*this, NewFD)) 720 return false; 721 722 return true; 723} 724 725/// Check the given declaration statement is legal within a constexpr function 726/// body. C++0x [dcl.constexpr]p3,p4. 727/// 728/// \return true if the body is OK, false if we have diagnosed a problem. 729static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 730 DeclStmt *DS) { 731 // C++0x [dcl.constexpr]p3 and p4: 732 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 733 // contain only 734 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 735 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 736 switch ((*DclIt)->getKind()) { 737 case Decl::StaticAssert: 738 case Decl::Using: 739 case Decl::UsingShadow: 740 case Decl::UsingDirective: 741 case Decl::UnresolvedUsingTypename: 742 // - static_assert-declarations 743 // - using-declarations, 744 // - using-directives, 745 continue; 746 747 case Decl::Typedef: 748 case Decl::TypeAlias: { 749 // - typedef declarations and alias-declarations that do not define 750 // classes or enumerations, 751 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 752 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 753 // Don't allow variably-modified types in constexpr functions. 754 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 755 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 756 << TL.getSourceRange() << TL.getType() 757 << isa<CXXConstructorDecl>(Dcl); 758 return false; 759 } 760 continue; 761 } 762 763 case Decl::Enum: 764 case Decl::CXXRecord: 765 // As an extension, we allow the declaration (but not the definition) of 766 // classes and enumerations in all declarations, not just in typedef and 767 // alias declarations. 768 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 769 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 770 << isa<CXXConstructorDecl>(Dcl); 771 return false; 772 } 773 continue; 774 775 case Decl::Var: 776 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 777 << isa<CXXConstructorDecl>(Dcl); 778 return false; 779 780 default: 781 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 782 << isa<CXXConstructorDecl>(Dcl); 783 return false; 784 } 785 } 786 787 return true; 788} 789 790/// Check that the given field is initialized within a constexpr constructor. 791/// 792/// \param Dcl The constexpr constructor being checked. 793/// \param Field The field being checked. This may be a member of an anonymous 794/// struct or union nested within the class being checked. 795/// \param Inits All declarations, including anonymous struct/union members and 796/// indirect members, for which any initialization was provided. 797/// \param Diagnosed Set to true if an error is produced. 798static void CheckConstexprCtorInitializer(Sema &SemaRef, 799 const FunctionDecl *Dcl, 800 FieldDecl *Field, 801 llvm::SmallSet<Decl*, 16> &Inits, 802 bool &Diagnosed) { 803 if (Field->isUnnamedBitfield()) 804 return; 805 806 if (Field->isAnonymousStructOrUnion() && 807 Field->getType()->getAsCXXRecordDecl()->isEmpty()) 808 return; 809 810 if (!Inits.count(Field)) { 811 if (!Diagnosed) { 812 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 813 Diagnosed = true; 814 } 815 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 816 } else if (Field->isAnonymousStructOrUnion()) { 817 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 818 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 819 I != E; ++I) 820 // If an anonymous union contains an anonymous struct of which any member 821 // is initialized, all members must be initialized. 822 if (!RD->isUnion() || Inits.count(*I)) 823 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 824 } 825} 826 827/// Check the body for the given constexpr function declaration only contains 828/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 829/// 830/// \return true if the body is OK, false if we have diagnosed a problem. 831bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 832 if (isa<CXXTryStmt>(Body)) { 833 // C++11 [dcl.constexpr]p3: 834 // The definition of a constexpr function shall satisfy the following 835 // constraints: [...] 836 // - its function-body shall be = delete, = default, or a 837 // compound-statement 838 // 839 // C++11 [dcl.constexpr]p4: 840 // In the definition of a constexpr constructor, [...] 841 // - its function-body shall not be a function-try-block; 842 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 843 << isa<CXXConstructorDecl>(Dcl); 844 return false; 845 } 846 847 // - its function-body shall be [...] a compound-statement that contains only 848 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 849 850 llvm::SmallVector<SourceLocation, 4> ReturnStmts; 851 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 852 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 853 switch ((*BodyIt)->getStmtClass()) { 854 case Stmt::NullStmtClass: 855 // - null statements, 856 continue; 857 858 case Stmt::DeclStmtClass: 859 // - static_assert-declarations 860 // - using-declarations, 861 // - using-directives, 862 // - typedef declarations and alias-declarations that do not define 863 // classes or enumerations, 864 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 865 return false; 866 continue; 867 868 case Stmt::ReturnStmtClass: 869 // - and exactly one return statement; 870 if (isa<CXXConstructorDecl>(Dcl)) 871 break; 872 873 ReturnStmts.push_back((*BodyIt)->getLocStart()); 874 continue; 875 876 default: 877 break; 878 } 879 880 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 881 << isa<CXXConstructorDecl>(Dcl); 882 return false; 883 } 884 885 if (const CXXConstructorDecl *Constructor 886 = dyn_cast<CXXConstructorDecl>(Dcl)) { 887 const CXXRecordDecl *RD = Constructor->getParent(); 888 // DR1359: 889 // - every non-variant non-static data member and base class sub-object 890 // shall be initialized; 891 // - if the class is a non-empty union, or for each non-empty anonymous 892 // union member of a non-union class, exactly one non-static data member 893 // shall be initialized; 894 if (RD->isUnion()) { 895 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) { 896 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 897 return false; 898 } 899 } else if (!Constructor->isDependentContext() && 900 !Constructor->isDelegatingConstructor()) { 901 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 902 903 // Skip detailed checking if we have enough initializers, and we would 904 // allow at most one initializer per member. 905 bool AnyAnonStructUnionMembers = false; 906 unsigned Fields = 0; 907 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 908 E = RD->field_end(); I != E; ++I, ++Fields) { 909 if ((*I)->isAnonymousStructOrUnion()) { 910 AnyAnonStructUnionMembers = true; 911 break; 912 } 913 } 914 if (AnyAnonStructUnionMembers || 915 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 916 // Check initialization of non-static data members. Base classes are 917 // always initialized so do not need to be checked. Dependent bases 918 // might not have initializers in the member initializer list. 919 llvm::SmallSet<Decl*, 16> Inits; 920 for (CXXConstructorDecl::init_const_iterator 921 I = Constructor->init_begin(), E = Constructor->init_end(); 922 I != E; ++I) { 923 if (FieldDecl *FD = (*I)->getMember()) 924 Inits.insert(FD); 925 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 926 Inits.insert(ID->chain_begin(), ID->chain_end()); 927 } 928 929 bool Diagnosed = false; 930 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 931 E = RD->field_end(); I != E; ++I) 932 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 933 if (Diagnosed) 934 return false; 935 } 936 } 937 } else { 938 if (ReturnStmts.empty()) { 939 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 940 return false; 941 } 942 if (ReturnStmts.size() > 1) { 943 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 944 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 945 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 946 return false; 947 } 948 } 949 950 // C++11 [dcl.constexpr]p5: 951 // if no function argument values exist such that the function invocation 952 // substitution would produce a constant expression, the program is 953 // ill-formed; no diagnostic required. 954 // C++11 [dcl.constexpr]p3: 955 // - every constructor call and implicit conversion used in initializing the 956 // return value shall be one of those allowed in a constant expression. 957 // C++11 [dcl.constexpr]p4: 958 // - every constructor involved in initializing non-static data members and 959 // base class sub-objects shall be a constexpr constructor. 960 llvm::SmallVector<PartialDiagnosticAt, 8> Diags; 961 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) { 962 Diag(Dcl->getLocation(), diag::err_constexpr_function_never_constant_expr) 963 << isa<CXXConstructorDecl>(Dcl); 964 for (size_t I = 0, N = Diags.size(); I != N; ++I) 965 Diag(Diags[I].first, Diags[I].second); 966 return false; 967 } 968 969 return true; 970} 971 972/// isCurrentClassName - Determine whether the identifier II is the 973/// name of the class type currently being defined. In the case of 974/// nested classes, this will only return true if II is the name of 975/// the innermost class. 976bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 977 const CXXScopeSpec *SS) { 978 assert(getLangOptions().CPlusPlus && "No class names in C!"); 979 980 CXXRecordDecl *CurDecl; 981 if (SS && SS->isSet() && !SS->isInvalid()) { 982 DeclContext *DC = computeDeclContext(*SS, true); 983 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 984 } else 985 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 986 987 if (CurDecl && CurDecl->getIdentifier()) 988 return &II == CurDecl->getIdentifier(); 989 else 990 return false; 991} 992 993/// \brief Check the validity of a C++ base class specifier. 994/// 995/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 996/// and returns NULL otherwise. 997CXXBaseSpecifier * 998Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 999 SourceRange SpecifierRange, 1000 bool Virtual, AccessSpecifier Access, 1001 TypeSourceInfo *TInfo, 1002 SourceLocation EllipsisLoc) { 1003 QualType BaseType = TInfo->getType(); 1004 1005 // C++ [class.union]p1: 1006 // A union shall not have base classes. 1007 if (Class->isUnion()) { 1008 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1009 << SpecifierRange; 1010 return 0; 1011 } 1012 1013 if (EllipsisLoc.isValid() && 1014 !TInfo->getType()->containsUnexpandedParameterPack()) { 1015 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1016 << TInfo->getTypeLoc().getSourceRange(); 1017 EllipsisLoc = SourceLocation(); 1018 } 1019 1020 if (BaseType->isDependentType()) 1021 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1022 Class->getTagKind() == TTK_Class, 1023 Access, TInfo, EllipsisLoc); 1024 1025 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1026 1027 // Base specifiers must be record types. 1028 if (!BaseType->isRecordType()) { 1029 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1030 return 0; 1031 } 1032 1033 // C++ [class.union]p1: 1034 // A union shall not be used as a base class. 1035 if (BaseType->isUnionType()) { 1036 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1037 return 0; 1038 } 1039 1040 // C++ [class.derived]p2: 1041 // The class-name in a base-specifier shall not be an incompletely 1042 // defined class. 1043 if (RequireCompleteType(BaseLoc, BaseType, 1044 PDiag(diag::err_incomplete_base_class) 1045 << SpecifierRange)) { 1046 Class->setInvalidDecl(); 1047 return 0; 1048 } 1049 1050 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1051 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1052 assert(BaseDecl && "Record type has no declaration"); 1053 BaseDecl = BaseDecl->getDefinition(); 1054 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1055 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1056 assert(CXXBaseDecl && "Base type is not a C++ type"); 1057 1058 // C++ [class]p3: 1059 // If a class is marked final and it appears as a base-type-specifier in 1060 // base-clause, the program is ill-formed. 1061 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1062 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1063 << CXXBaseDecl->getDeclName(); 1064 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1065 << CXXBaseDecl->getDeclName(); 1066 return 0; 1067 } 1068 1069 if (BaseDecl->isInvalidDecl()) 1070 Class->setInvalidDecl(); 1071 1072 // Create the base specifier. 1073 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1074 Class->getTagKind() == TTK_Class, 1075 Access, TInfo, EllipsisLoc); 1076} 1077 1078/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1079/// one entry in the base class list of a class specifier, for 1080/// example: 1081/// class foo : public bar, virtual private baz { 1082/// 'public bar' and 'virtual private baz' are each base-specifiers. 1083BaseResult 1084Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1085 bool Virtual, AccessSpecifier Access, 1086 ParsedType basetype, SourceLocation BaseLoc, 1087 SourceLocation EllipsisLoc) { 1088 if (!classdecl) 1089 return true; 1090 1091 AdjustDeclIfTemplate(classdecl); 1092 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1093 if (!Class) 1094 return true; 1095 1096 TypeSourceInfo *TInfo = 0; 1097 GetTypeFromParser(basetype, &TInfo); 1098 1099 if (EllipsisLoc.isInvalid() && 1100 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1101 UPPC_BaseType)) 1102 return true; 1103 1104 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1105 Virtual, Access, TInfo, 1106 EllipsisLoc)) 1107 return BaseSpec; 1108 1109 return true; 1110} 1111 1112/// \brief Performs the actual work of attaching the given base class 1113/// specifiers to a C++ class. 1114bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1115 unsigned NumBases) { 1116 if (NumBases == 0) 1117 return false; 1118 1119 // Used to keep track of which base types we have already seen, so 1120 // that we can properly diagnose redundant direct base types. Note 1121 // that the key is always the unqualified canonical type of the base 1122 // class. 1123 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1124 1125 // Copy non-redundant base specifiers into permanent storage. 1126 unsigned NumGoodBases = 0; 1127 bool Invalid = false; 1128 for (unsigned idx = 0; idx < NumBases; ++idx) { 1129 QualType NewBaseType 1130 = Context.getCanonicalType(Bases[idx]->getType()); 1131 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1132 if (KnownBaseTypes[NewBaseType]) { 1133 // C++ [class.mi]p3: 1134 // A class shall not be specified as a direct base class of a 1135 // derived class more than once. 1136 Diag(Bases[idx]->getSourceRange().getBegin(), 1137 diag::err_duplicate_base_class) 1138 << KnownBaseTypes[NewBaseType]->getType() 1139 << Bases[idx]->getSourceRange(); 1140 1141 // Delete the duplicate base class specifier; we're going to 1142 // overwrite its pointer later. 1143 Context.Deallocate(Bases[idx]); 1144 1145 Invalid = true; 1146 } else { 1147 // Okay, add this new base class. 1148 KnownBaseTypes[NewBaseType] = Bases[idx]; 1149 Bases[NumGoodBases++] = Bases[idx]; 1150 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) 1151 if (const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl())) 1152 if (RD->hasAttr<WeakAttr>()) 1153 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1154 } 1155 } 1156 1157 // Attach the remaining base class specifiers to the derived class. 1158 Class->setBases(Bases, NumGoodBases); 1159 1160 // Delete the remaining (good) base class specifiers, since their 1161 // data has been copied into the CXXRecordDecl. 1162 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1163 Context.Deallocate(Bases[idx]); 1164 1165 return Invalid; 1166} 1167 1168/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1169/// class, after checking whether there are any duplicate base 1170/// classes. 1171void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1172 unsigned NumBases) { 1173 if (!ClassDecl || !Bases || !NumBases) 1174 return; 1175 1176 AdjustDeclIfTemplate(ClassDecl); 1177 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1178 (CXXBaseSpecifier**)(Bases), NumBases); 1179} 1180 1181static CXXRecordDecl *GetClassForType(QualType T) { 1182 if (const RecordType *RT = T->getAs<RecordType>()) 1183 return cast<CXXRecordDecl>(RT->getDecl()); 1184 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1185 return ICT->getDecl(); 1186 else 1187 return 0; 1188} 1189 1190/// \brief Determine whether the type \p Derived is a C++ class that is 1191/// derived from the type \p Base. 1192bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1193 if (!getLangOptions().CPlusPlus) 1194 return false; 1195 1196 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1197 if (!DerivedRD) 1198 return false; 1199 1200 CXXRecordDecl *BaseRD = GetClassForType(Base); 1201 if (!BaseRD) 1202 return false; 1203 1204 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1205 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1206} 1207 1208/// \brief Determine whether the type \p Derived is a C++ class that is 1209/// derived from the type \p Base. 1210bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1211 if (!getLangOptions().CPlusPlus) 1212 return false; 1213 1214 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1215 if (!DerivedRD) 1216 return false; 1217 1218 CXXRecordDecl *BaseRD = GetClassForType(Base); 1219 if (!BaseRD) 1220 return false; 1221 1222 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1223} 1224 1225void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1226 CXXCastPath &BasePathArray) { 1227 assert(BasePathArray.empty() && "Base path array must be empty!"); 1228 assert(Paths.isRecordingPaths() && "Must record paths!"); 1229 1230 const CXXBasePath &Path = Paths.front(); 1231 1232 // We first go backward and check if we have a virtual base. 1233 // FIXME: It would be better if CXXBasePath had the base specifier for 1234 // the nearest virtual base. 1235 unsigned Start = 0; 1236 for (unsigned I = Path.size(); I != 0; --I) { 1237 if (Path[I - 1].Base->isVirtual()) { 1238 Start = I - 1; 1239 break; 1240 } 1241 } 1242 1243 // Now add all bases. 1244 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1245 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1246} 1247 1248/// \brief Determine whether the given base path includes a virtual 1249/// base class. 1250bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1251 for (CXXCastPath::const_iterator B = BasePath.begin(), 1252 BEnd = BasePath.end(); 1253 B != BEnd; ++B) 1254 if ((*B)->isVirtual()) 1255 return true; 1256 1257 return false; 1258} 1259 1260/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1261/// conversion (where Derived and Base are class types) is 1262/// well-formed, meaning that the conversion is unambiguous (and 1263/// that all of the base classes are accessible). Returns true 1264/// and emits a diagnostic if the code is ill-formed, returns false 1265/// otherwise. Loc is the location where this routine should point to 1266/// if there is an error, and Range is the source range to highlight 1267/// if there is an error. 1268bool 1269Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1270 unsigned InaccessibleBaseID, 1271 unsigned AmbigiousBaseConvID, 1272 SourceLocation Loc, SourceRange Range, 1273 DeclarationName Name, 1274 CXXCastPath *BasePath) { 1275 // First, determine whether the path from Derived to Base is 1276 // ambiguous. This is slightly more expensive than checking whether 1277 // the Derived to Base conversion exists, because here we need to 1278 // explore multiple paths to determine if there is an ambiguity. 1279 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1280 /*DetectVirtual=*/false); 1281 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1282 assert(DerivationOkay && 1283 "Can only be used with a derived-to-base conversion"); 1284 (void)DerivationOkay; 1285 1286 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1287 if (InaccessibleBaseID) { 1288 // Check that the base class can be accessed. 1289 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1290 InaccessibleBaseID)) { 1291 case AR_inaccessible: 1292 return true; 1293 case AR_accessible: 1294 case AR_dependent: 1295 case AR_delayed: 1296 break; 1297 } 1298 } 1299 1300 // Build a base path if necessary. 1301 if (BasePath) 1302 BuildBasePathArray(Paths, *BasePath); 1303 return false; 1304 } 1305 1306 // We know that the derived-to-base conversion is ambiguous, and 1307 // we're going to produce a diagnostic. Perform the derived-to-base 1308 // search just one more time to compute all of the possible paths so 1309 // that we can print them out. This is more expensive than any of 1310 // the previous derived-to-base checks we've done, but at this point 1311 // performance isn't as much of an issue. 1312 Paths.clear(); 1313 Paths.setRecordingPaths(true); 1314 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1315 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1316 (void)StillOkay; 1317 1318 // Build up a textual representation of the ambiguous paths, e.g., 1319 // D -> B -> A, that will be used to illustrate the ambiguous 1320 // conversions in the diagnostic. We only print one of the paths 1321 // to each base class subobject. 1322 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1323 1324 Diag(Loc, AmbigiousBaseConvID) 1325 << Derived << Base << PathDisplayStr << Range << Name; 1326 return true; 1327} 1328 1329bool 1330Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1331 SourceLocation Loc, SourceRange Range, 1332 CXXCastPath *BasePath, 1333 bool IgnoreAccess) { 1334 return CheckDerivedToBaseConversion(Derived, Base, 1335 IgnoreAccess ? 0 1336 : diag::err_upcast_to_inaccessible_base, 1337 diag::err_ambiguous_derived_to_base_conv, 1338 Loc, Range, DeclarationName(), 1339 BasePath); 1340} 1341 1342 1343/// @brief Builds a string representing ambiguous paths from a 1344/// specific derived class to different subobjects of the same base 1345/// class. 1346/// 1347/// This function builds a string that can be used in error messages 1348/// to show the different paths that one can take through the 1349/// inheritance hierarchy to go from the derived class to different 1350/// subobjects of a base class. The result looks something like this: 1351/// @code 1352/// struct D -> struct B -> struct A 1353/// struct D -> struct C -> struct A 1354/// @endcode 1355std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1356 std::string PathDisplayStr; 1357 std::set<unsigned> DisplayedPaths; 1358 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1359 Path != Paths.end(); ++Path) { 1360 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1361 // We haven't displayed a path to this particular base 1362 // class subobject yet. 1363 PathDisplayStr += "\n "; 1364 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1365 for (CXXBasePath::const_iterator Element = Path->begin(); 1366 Element != Path->end(); ++Element) 1367 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1368 } 1369 } 1370 1371 return PathDisplayStr; 1372} 1373 1374//===----------------------------------------------------------------------===// 1375// C++ class member Handling 1376//===----------------------------------------------------------------------===// 1377 1378/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1379bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1380 SourceLocation ASLoc, 1381 SourceLocation ColonLoc, 1382 AttributeList *Attrs) { 1383 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1384 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1385 ASLoc, ColonLoc); 1386 CurContext->addHiddenDecl(ASDecl); 1387 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1388} 1389 1390/// CheckOverrideControl - Check C++0x override control semantics. 1391void Sema::CheckOverrideControl(const Decl *D) { 1392 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1393 if (!MD || !MD->isVirtual()) 1394 return; 1395 1396 if (MD->isDependentContext()) 1397 return; 1398 1399 // C++0x [class.virtual]p3: 1400 // If a virtual function is marked with the virt-specifier override and does 1401 // not override a member function of a base class, 1402 // the program is ill-formed. 1403 bool HasOverriddenMethods = 1404 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1405 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1406 Diag(MD->getLocation(), 1407 diag::err_function_marked_override_not_overriding) 1408 << MD->getDeclName(); 1409 return; 1410 } 1411} 1412 1413/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1414/// function overrides a virtual member function marked 'final', according to 1415/// C++0x [class.virtual]p3. 1416bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1417 const CXXMethodDecl *Old) { 1418 if (!Old->hasAttr<FinalAttr>()) 1419 return false; 1420 1421 Diag(New->getLocation(), diag::err_final_function_overridden) 1422 << New->getDeclName(); 1423 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1424 return true; 1425} 1426 1427/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1428/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1429/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1430/// one has been parsed, and 'HasDeferredInit' is true if an initializer is 1431/// present but parsing it has been deferred. 1432Decl * 1433Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1434 MultiTemplateParamsArg TemplateParameterLists, 1435 Expr *BW, const VirtSpecifiers &VS, 1436 bool HasDeferredInit) { 1437 const DeclSpec &DS = D.getDeclSpec(); 1438 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1439 DeclarationName Name = NameInfo.getName(); 1440 SourceLocation Loc = NameInfo.getLoc(); 1441 1442 // For anonymous bitfields, the location should point to the type. 1443 if (Loc.isInvalid()) 1444 Loc = D.getSourceRange().getBegin(); 1445 1446 Expr *BitWidth = static_cast<Expr*>(BW); 1447 1448 assert(isa<CXXRecordDecl>(CurContext)); 1449 assert(!DS.isFriendSpecified()); 1450 1451 bool isFunc = D.isDeclarationOfFunction(); 1452 1453 // C++ 9.2p6: A member shall not be declared to have automatic storage 1454 // duration (auto, register) or with the extern storage-class-specifier. 1455 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1456 // data members and cannot be applied to names declared const or static, 1457 // and cannot be applied to reference members. 1458 switch (DS.getStorageClassSpec()) { 1459 case DeclSpec::SCS_unspecified: 1460 case DeclSpec::SCS_typedef: 1461 case DeclSpec::SCS_static: 1462 // FALL THROUGH. 1463 break; 1464 case DeclSpec::SCS_mutable: 1465 if (isFunc) { 1466 if (DS.getStorageClassSpecLoc().isValid()) 1467 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1468 else 1469 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1470 1471 // FIXME: It would be nicer if the keyword was ignored only for this 1472 // declarator. Otherwise we could get follow-up errors. 1473 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1474 } 1475 break; 1476 default: 1477 if (DS.getStorageClassSpecLoc().isValid()) 1478 Diag(DS.getStorageClassSpecLoc(), 1479 diag::err_storageclass_invalid_for_member); 1480 else 1481 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1482 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1483 } 1484 1485 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1486 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1487 !isFunc); 1488 1489 Decl *Member; 1490 if (isInstField) { 1491 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1492 1493 // Data members must have identifiers for names. 1494 if (Name.getNameKind() != DeclarationName::Identifier) { 1495 Diag(Loc, diag::err_bad_variable_name) 1496 << Name; 1497 return 0; 1498 } 1499 1500 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1501 1502 // Member field could not be with "template" keyword. 1503 // So TemplateParameterLists should be empty in this case. 1504 if (TemplateParameterLists.size()) { 1505 TemplateParameterList* TemplateParams = TemplateParameterLists.get()[0]; 1506 if (TemplateParams->size()) { 1507 // There is no such thing as a member field template. 1508 Diag(D.getIdentifierLoc(), diag::err_template_member) 1509 << II 1510 << SourceRange(TemplateParams->getTemplateLoc(), 1511 TemplateParams->getRAngleLoc()); 1512 } else { 1513 // There is an extraneous 'template<>' for this member. 1514 Diag(TemplateParams->getTemplateLoc(), 1515 diag::err_template_member_noparams) 1516 << II 1517 << SourceRange(TemplateParams->getTemplateLoc(), 1518 TemplateParams->getRAngleLoc()); 1519 } 1520 return 0; 1521 } 1522 1523 if (SS.isSet() && !SS.isInvalid()) { 1524 // The user provided a superfluous scope specifier inside a class 1525 // definition: 1526 // 1527 // class X { 1528 // int X::member; 1529 // }; 1530 DeclContext *DC = 0; 1531 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1532 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1533 << Name << FixItHint::CreateRemoval(SS.getRange()); 1534 else 1535 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1536 << Name << SS.getRange(); 1537 1538 SS.clear(); 1539 } 1540 1541 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1542 HasDeferredInit, AS); 1543 assert(Member && "HandleField never returns null"); 1544 } else { 1545 assert(!HasDeferredInit); 1546 1547 Member = HandleDeclarator(S, D, move(TemplateParameterLists)); 1548 if (!Member) { 1549 return 0; 1550 } 1551 1552 // Non-instance-fields can't have a bitfield. 1553 if (BitWidth) { 1554 if (Member->isInvalidDecl()) { 1555 // don't emit another diagnostic. 1556 } else if (isa<VarDecl>(Member)) { 1557 // C++ 9.6p3: A bit-field shall not be a static member. 1558 // "static member 'A' cannot be a bit-field" 1559 Diag(Loc, diag::err_static_not_bitfield) 1560 << Name << BitWidth->getSourceRange(); 1561 } else if (isa<TypedefDecl>(Member)) { 1562 // "typedef member 'x' cannot be a bit-field" 1563 Diag(Loc, diag::err_typedef_not_bitfield) 1564 << Name << BitWidth->getSourceRange(); 1565 } else { 1566 // A function typedef ("typedef int f(); f a;"). 1567 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1568 Diag(Loc, diag::err_not_integral_type_bitfield) 1569 << Name << cast<ValueDecl>(Member)->getType() 1570 << BitWidth->getSourceRange(); 1571 } 1572 1573 BitWidth = 0; 1574 Member->setInvalidDecl(); 1575 } 1576 1577 Member->setAccess(AS); 1578 1579 // If we have declared a member function template, set the access of the 1580 // templated declaration as well. 1581 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1582 FunTmpl->getTemplatedDecl()->setAccess(AS); 1583 } 1584 1585 if (VS.isOverrideSpecified()) { 1586 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1587 if (!MD || !MD->isVirtual()) { 1588 Diag(Member->getLocStart(), 1589 diag::override_keyword_only_allowed_on_virtual_member_functions) 1590 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1591 } else 1592 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1593 } 1594 if (VS.isFinalSpecified()) { 1595 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1596 if (!MD || !MD->isVirtual()) { 1597 Diag(Member->getLocStart(), 1598 diag::override_keyword_only_allowed_on_virtual_member_functions) 1599 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1600 } else 1601 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1602 } 1603 1604 if (VS.getLastLocation().isValid()) { 1605 // Update the end location of a method that has a virt-specifiers. 1606 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1607 MD->setRangeEnd(VS.getLastLocation()); 1608 } 1609 1610 CheckOverrideControl(Member); 1611 1612 assert((Name || isInstField) && "No identifier for non-field ?"); 1613 1614 if (isInstField) 1615 FieldCollector->Add(cast<FieldDecl>(Member)); 1616 return Member; 1617} 1618 1619/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1620/// in-class initializer for a non-static C++ class member, and after 1621/// instantiating an in-class initializer in a class template. Such actions 1622/// are deferred until the class is complete. 1623void 1624Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation EqualLoc, 1625 Expr *InitExpr) { 1626 FieldDecl *FD = cast<FieldDecl>(D); 1627 1628 if (!InitExpr) { 1629 FD->setInvalidDecl(); 1630 FD->removeInClassInitializer(); 1631 return; 1632 } 1633 1634 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1635 FD->setInvalidDecl(); 1636 FD->removeInClassInitializer(); 1637 return; 1638 } 1639 1640 ExprResult Init = InitExpr; 1641 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1642 if (isa<InitListExpr>(InitExpr) && isStdInitializerList(FD->getType(), 0)) { 1643 Diag(FD->getLocation(), diag::warn_dangling_std_initializer_list) 1644 << /*at end of ctor*/1 << InitExpr->getSourceRange(); 1645 } 1646 Expr **Inits = &InitExpr; 1647 unsigned NumInits = 1; 1648 InitializedEntity Entity = InitializedEntity::InitializeMember(FD); 1649 InitializationKind Kind = EqualLoc.isInvalid() 1650 ? InitializationKind::CreateDirectList(InitExpr->getLocStart()) 1651 : InitializationKind::CreateCopy(InitExpr->getLocStart(), EqualLoc); 1652 InitializationSequence Seq(*this, Entity, Kind, Inits, NumInits); 1653 Init = Seq.Perform(*this, Entity, Kind, MultiExprArg(Inits, NumInits)); 1654 if (Init.isInvalid()) { 1655 FD->setInvalidDecl(); 1656 return; 1657 } 1658 1659 CheckImplicitConversions(Init.get(), EqualLoc); 1660 } 1661 1662 // C++0x [class.base.init]p7: 1663 // The initialization of each base and member constitutes a 1664 // full-expression. 1665 Init = MaybeCreateExprWithCleanups(Init); 1666 if (Init.isInvalid()) { 1667 FD->setInvalidDecl(); 1668 return; 1669 } 1670 1671 InitExpr = Init.release(); 1672 1673 FD->setInClassInitializer(InitExpr); 1674} 1675 1676/// \brief Find the direct and/or virtual base specifiers that 1677/// correspond to the given base type, for use in base initialization 1678/// within a constructor. 1679static bool FindBaseInitializer(Sema &SemaRef, 1680 CXXRecordDecl *ClassDecl, 1681 QualType BaseType, 1682 const CXXBaseSpecifier *&DirectBaseSpec, 1683 const CXXBaseSpecifier *&VirtualBaseSpec) { 1684 // First, check for a direct base class. 1685 DirectBaseSpec = 0; 1686 for (CXXRecordDecl::base_class_const_iterator Base 1687 = ClassDecl->bases_begin(); 1688 Base != ClassDecl->bases_end(); ++Base) { 1689 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1690 // We found a direct base of this type. That's what we're 1691 // initializing. 1692 DirectBaseSpec = &*Base; 1693 break; 1694 } 1695 } 1696 1697 // Check for a virtual base class. 1698 // FIXME: We might be able to short-circuit this if we know in advance that 1699 // there are no virtual bases. 1700 VirtualBaseSpec = 0; 1701 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1702 // We haven't found a base yet; search the class hierarchy for a 1703 // virtual base class. 1704 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1705 /*DetectVirtual=*/false); 1706 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1707 BaseType, Paths)) { 1708 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1709 Path != Paths.end(); ++Path) { 1710 if (Path->back().Base->isVirtual()) { 1711 VirtualBaseSpec = Path->back().Base; 1712 break; 1713 } 1714 } 1715 } 1716 } 1717 1718 return DirectBaseSpec || VirtualBaseSpec; 1719} 1720 1721/// \brief Handle a C++ member initializer using braced-init-list syntax. 1722MemInitResult 1723Sema::ActOnMemInitializer(Decl *ConstructorD, 1724 Scope *S, 1725 CXXScopeSpec &SS, 1726 IdentifierInfo *MemberOrBase, 1727 ParsedType TemplateTypeTy, 1728 const DeclSpec &DS, 1729 SourceLocation IdLoc, 1730 Expr *InitList, 1731 SourceLocation EllipsisLoc) { 1732 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1733 DS, IdLoc, InitList, 1734 EllipsisLoc); 1735} 1736 1737/// \brief Handle a C++ member initializer using parentheses syntax. 1738MemInitResult 1739Sema::ActOnMemInitializer(Decl *ConstructorD, 1740 Scope *S, 1741 CXXScopeSpec &SS, 1742 IdentifierInfo *MemberOrBase, 1743 ParsedType TemplateTypeTy, 1744 const DeclSpec &DS, 1745 SourceLocation IdLoc, 1746 SourceLocation LParenLoc, 1747 Expr **Args, unsigned NumArgs, 1748 SourceLocation RParenLoc, 1749 SourceLocation EllipsisLoc) { 1750 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1751 RParenLoc); 1752 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1753 DS, IdLoc, List, EllipsisLoc); 1754} 1755 1756namespace { 1757 1758// Callback to only accept typo corrections that can be a valid C++ member 1759// intializer: either a non-static field member or a base class. 1760class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 1761 public: 1762 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 1763 : ClassDecl(ClassDecl) {} 1764 1765 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 1766 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 1767 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 1768 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 1769 else 1770 return isa<TypeDecl>(ND); 1771 } 1772 return false; 1773 } 1774 1775 private: 1776 CXXRecordDecl *ClassDecl; 1777}; 1778 1779} 1780 1781/// \brief Handle a C++ member initializer. 1782MemInitResult 1783Sema::BuildMemInitializer(Decl *ConstructorD, 1784 Scope *S, 1785 CXXScopeSpec &SS, 1786 IdentifierInfo *MemberOrBase, 1787 ParsedType TemplateTypeTy, 1788 const DeclSpec &DS, 1789 SourceLocation IdLoc, 1790 Expr *Init, 1791 SourceLocation EllipsisLoc) { 1792 if (!ConstructorD) 1793 return true; 1794 1795 AdjustDeclIfTemplate(ConstructorD); 1796 1797 CXXConstructorDecl *Constructor 1798 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1799 if (!Constructor) { 1800 // The user wrote a constructor initializer on a function that is 1801 // not a C++ constructor. Ignore the error for now, because we may 1802 // have more member initializers coming; we'll diagnose it just 1803 // once in ActOnMemInitializers. 1804 return true; 1805 } 1806 1807 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1808 1809 // C++ [class.base.init]p2: 1810 // Names in a mem-initializer-id are looked up in the scope of the 1811 // constructor's class and, if not found in that scope, are looked 1812 // up in the scope containing the constructor's definition. 1813 // [Note: if the constructor's class contains a member with the 1814 // same name as a direct or virtual base class of the class, a 1815 // mem-initializer-id naming the member or base class and composed 1816 // of a single identifier refers to the class member. A 1817 // mem-initializer-id for the hidden base class may be specified 1818 // using a qualified name. ] 1819 if (!SS.getScopeRep() && !TemplateTypeTy) { 1820 // Look for a member, first. 1821 DeclContext::lookup_result Result 1822 = ClassDecl->lookup(MemberOrBase); 1823 if (Result.first != Result.second) { 1824 ValueDecl *Member; 1825 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 1826 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 1827 if (EllipsisLoc.isValid()) 1828 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1829 << MemberOrBase 1830 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 1831 1832 return BuildMemberInitializer(Member, Init, IdLoc); 1833 } 1834 } 1835 } 1836 // It didn't name a member, so see if it names a class. 1837 QualType BaseType; 1838 TypeSourceInfo *TInfo = 0; 1839 1840 if (TemplateTypeTy) { 1841 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1842 } else if (DS.getTypeSpecType() == TST_decltype) { 1843 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 1844 } else { 1845 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1846 LookupParsedName(R, S, &SS); 1847 1848 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1849 if (!TyD) { 1850 if (R.isAmbiguous()) return true; 1851 1852 // We don't want access-control diagnostics here. 1853 R.suppressDiagnostics(); 1854 1855 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1856 bool NotUnknownSpecialization = false; 1857 DeclContext *DC = computeDeclContext(SS, false); 1858 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1859 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1860 1861 if (!NotUnknownSpecialization) { 1862 // When the scope specifier can refer to a member of an unknown 1863 // specialization, we take it as a type name. 1864 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1865 SS.getWithLocInContext(Context), 1866 *MemberOrBase, IdLoc); 1867 if (BaseType.isNull()) 1868 return true; 1869 1870 R.clear(); 1871 R.setLookupName(MemberOrBase); 1872 } 1873 } 1874 1875 // If no results were found, try to correct typos. 1876 TypoCorrection Corr; 1877 MemInitializerValidatorCCC Validator(ClassDecl); 1878 if (R.empty() && BaseType.isNull() && 1879 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1880 Validator, ClassDecl))) { 1881 std::string CorrectedStr(Corr.getAsString(getLangOptions())); 1882 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOptions())); 1883 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1884 // We have found a non-static data member with a similar 1885 // name to what was typed; complain and initialize that 1886 // member. 1887 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1888 << MemberOrBase << true << CorrectedQuotedStr 1889 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1890 Diag(Member->getLocation(), diag::note_previous_decl) 1891 << CorrectedQuotedStr; 1892 1893 return BuildMemberInitializer(Member, Init, IdLoc); 1894 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1895 const CXXBaseSpecifier *DirectBaseSpec; 1896 const CXXBaseSpecifier *VirtualBaseSpec; 1897 if (FindBaseInitializer(*this, ClassDecl, 1898 Context.getTypeDeclType(Type), 1899 DirectBaseSpec, VirtualBaseSpec)) { 1900 // We have found a direct or virtual base class with a 1901 // similar name to what was typed; complain and initialize 1902 // that base class. 1903 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1904 << MemberOrBase << false << CorrectedQuotedStr 1905 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1906 1907 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1908 : VirtualBaseSpec; 1909 Diag(BaseSpec->getSourceRange().getBegin(), 1910 diag::note_base_class_specified_here) 1911 << BaseSpec->getType() 1912 << BaseSpec->getSourceRange(); 1913 1914 TyD = Type; 1915 } 1916 } 1917 } 1918 1919 if (!TyD && BaseType.isNull()) { 1920 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1921 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 1922 return true; 1923 } 1924 } 1925 1926 if (BaseType.isNull()) { 1927 BaseType = Context.getTypeDeclType(TyD); 1928 if (SS.isSet()) { 1929 NestedNameSpecifier *Qualifier = 1930 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1931 1932 // FIXME: preserve source range information 1933 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1934 } 1935 } 1936 } 1937 1938 if (!TInfo) 1939 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1940 1941 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 1942} 1943 1944/// Checks a member initializer expression for cases where reference (or 1945/// pointer) members are bound to by-value parameters (or their addresses). 1946static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 1947 Expr *Init, 1948 SourceLocation IdLoc) { 1949 QualType MemberTy = Member->getType(); 1950 1951 // We only handle pointers and references currently. 1952 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 1953 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 1954 return; 1955 1956 const bool IsPointer = MemberTy->isPointerType(); 1957 if (IsPointer) { 1958 if (const UnaryOperator *Op 1959 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 1960 // The only case we're worried about with pointers requires taking the 1961 // address. 1962 if (Op->getOpcode() != UO_AddrOf) 1963 return; 1964 1965 Init = Op->getSubExpr(); 1966 } else { 1967 // We only handle address-of expression initializers for pointers. 1968 return; 1969 } 1970 } 1971 1972 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 1973 // Taking the address of a temporary will be diagnosed as a hard error. 1974 if (IsPointer) 1975 return; 1976 1977 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 1978 << Member << Init->getSourceRange(); 1979 } else if (const DeclRefExpr *DRE 1980 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 1981 // We only warn when referring to a non-reference parameter declaration. 1982 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 1983 if (!Parameter || Parameter->getType()->isReferenceType()) 1984 return; 1985 1986 S.Diag(Init->getExprLoc(), 1987 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 1988 : diag::warn_bind_ref_member_to_parameter) 1989 << Member << Parameter << Init->getSourceRange(); 1990 } else { 1991 // Other initializers are fine. 1992 return; 1993 } 1994 1995 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 1996 << (unsigned)IsPointer; 1997} 1998 1999/// Checks an initializer expression for use of uninitialized fields, such as 2000/// containing the field that is being initialized. Returns true if there is an 2001/// uninitialized field was used an updates the SourceLocation parameter; false 2002/// otherwise. 2003static bool InitExprContainsUninitializedFields(const Stmt *S, 2004 const ValueDecl *LhsField, 2005 SourceLocation *L) { 2006 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 2007 2008 if (isa<CallExpr>(S)) { 2009 // Do not descend into function calls or constructors, as the use 2010 // of an uninitialized field may be valid. One would have to inspect 2011 // the contents of the function/ctor to determine if it is safe or not. 2012 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 2013 // may be safe, depending on what the function/ctor does. 2014 return false; 2015 } 2016 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 2017 const NamedDecl *RhsField = ME->getMemberDecl(); 2018 2019 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 2020 // The member expression points to a static data member. 2021 assert(VD->isStaticDataMember() && 2022 "Member points to non-static data member!"); 2023 (void)VD; 2024 return false; 2025 } 2026 2027 if (isa<EnumConstantDecl>(RhsField)) { 2028 // The member expression points to an enum. 2029 return false; 2030 } 2031 2032 if (RhsField == LhsField) { 2033 // Initializing a field with itself. Throw a warning. 2034 // But wait; there are exceptions! 2035 // Exception #1: The field may not belong to this record. 2036 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 2037 const Expr *base = ME->getBase(); 2038 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 2039 // Even though the field matches, it does not belong to this record. 2040 return false; 2041 } 2042 // None of the exceptions triggered; return true to indicate an 2043 // uninitialized field was used. 2044 *L = ME->getMemberLoc(); 2045 return true; 2046 } 2047 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 2048 // sizeof/alignof doesn't reference contents, do not warn. 2049 return false; 2050 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 2051 // address-of doesn't reference contents (the pointer may be dereferenced 2052 // in the same expression but it would be rare; and weird). 2053 if (UOE->getOpcode() == UO_AddrOf) 2054 return false; 2055 } 2056 for (Stmt::const_child_range it = S->children(); it; ++it) { 2057 if (!*it) { 2058 // An expression such as 'member(arg ?: "")' may trigger this. 2059 continue; 2060 } 2061 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 2062 return true; 2063 } 2064 return false; 2065} 2066 2067MemInitResult 2068Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2069 SourceLocation IdLoc) { 2070 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2071 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2072 assert((DirectMember || IndirectMember) && 2073 "Member must be a FieldDecl or IndirectFieldDecl"); 2074 2075 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2076 return true; 2077 2078 if (Member->isInvalidDecl()) 2079 return true; 2080 2081 // Diagnose value-uses of fields to initialize themselves, e.g. 2082 // foo(foo) 2083 // where foo is not also a parameter to the constructor. 2084 // TODO: implement -Wuninitialized and fold this into that framework. 2085 Expr **Args; 2086 unsigned NumArgs; 2087 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2088 Args = ParenList->getExprs(); 2089 NumArgs = ParenList->getNumExprs(); 2090 } else { 2091 InitListExpr *InitList = cast<InitListExpr>(Init); 2092 Args = InitList->getInits(); 2093 NumArgs = InitList->getNumInits(); 2094 } 2095 for (unsigned i = 0; i < NumArgs; ++i) { 2096 SourceLocation L; 2097 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 2098 // FIXME: Return true in the case when other fields are used before being 2099 // uninitialized. For example, let this field be the i'th field. When 2100 // initializing the i'th field, throw a warning if any of the >= i'th 2101 // fields are used, as they are not yet initialized. 2102 // Right now we are only handling the case where the i'th field uses 2103 // itself in its initializer. 2104 Diag(L, diag::warn_field_is_uninit); 2105 } 2106 } 2107 2108 SourceRange InitRange = Init->getSourceRange(); 2109 2110 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2111 // Can't check initialization for a member of dependent type or when 2112 // any of the arguments are type-dependent expressions. 2113 DiscardCleanupsInEvaluationContext(); 2114 } else { 2115 bool InitList = false; 2116 if (isa<InitListExpr>(Init)) { 2117 InitList = true; 2118 Args = &Init; 2119 NumArgs = 1; 2120 2121 if (isStdInitializerList(Member->getType(), 0)) { 2122 Diag(IdLoc, diag::warn_dangling_std_initializer_list) 2123 << /*at end of ctor*/1 << InitRange; 2124 } 2125 } 2126 2127 // Initialize the member. 2128 InitializedEntity MemberEntity = 2129 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2130 : InitializedEntity::InitializeMember(IndirectMember, 0); 2131 InitializationKind Kind = 2132 InitList ? InitializationKind::CreateDirectList(IdLoc) 2133 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2134 InitRange.getEnd()); 2135 2136 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 2137 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, 2138 MultiExprArg(*this, Args, NumArgs), 2139 0); 2140 if (MemberInit.isInvalid()) 2141 return true; 2142 2143 CheckImplicitConversions(MemberInit.get(), 2144 InitRange.getBegin()); 2145 2146 // C++0x [class.base.init]p7: 2147 // The initialization of each base and member constitutes a 2148 // full-expression. 2149 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2150 if (MemberInit.isInvalid()) 2151 return true; 2152 2153 // If we are in a dependent context, template instantiation will 2154 // perform this type-checking again. Just save the arguments that we 2155 // received. 2156 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2157 // of the information that we have about the member 2158 // initializer. However, deconstructing the ASTs is a dicey process, 2159 // and this approach is far more likely to get the corner cases right. 2160 if (CurContext->isDependentContext()) { 2161 // The existing Init will do fine. 2162 } else { 2163 Init = MemberInit.get(); 2164 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2165 } 2166 } 2167 2168 if (DirectMember) { 2169 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2170 InitRange.getBegin(), Init, 2171 InitRange.getEnd()); 2172 } else { 2173 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2174 InitRange.getBegin(), Init, 2175 InitRange.getEnd()); 2176 } 2177} 2178 2179MemInitResult 2180Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2181 CXXRecordDecl *ClassDecl) { 2182 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2183 if (!LangOpts.CPlusPlus0x) 2184 return Diag(NameLoc, diag::err_delegating_ctor) 2185 << TInfo->getTypeLoc().getLocalSourceRange(); 2186 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2187 2188 bool InitList = true; 2189 Expr **Args = &Init; 2190 unsigned NumArgs = 1; 2191 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2192 InitList = false; 2193 Args = ParenList->getExprs(); 2194 NumArgs = ParenList->getNumExprs(); 2195 } 2196 2197 SourceRange InitRange = Init->getSourceRange(); 2198 // Initialize the object. 2199 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2200 QualType(ClassDecl->getTypeForDecl(), 0)); 2201 InitializationKind Kind = 2202 InitList ? InitializationKind::CreateDirectList(NameLoc) 2203 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2204 InitRange.getEnd()); 2205 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 2206 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2207 MultiExprArg(*this, Args,NumArgs), 2208 0); 2209 if (DelegationInit.isInvalid()) 2210 return true; 2211 2212 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2213 "Delegating constructor with no target?"); 2214 2215 CheckImplicitConversions(DelegationInit.get(), InitRange.getBegin()); 2216 2217 // C++0x [class.base.init]p7: 2218 // The initialization of each base and member constitutes a 2219 // full-expression. 2220 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2221 if (DelegationInit.isInvalid()) 2222 return true; 2223 2224 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2225 DelegationInit.takeAs<Expr>(), 2226 InitRange.getEnd()); 2227} 2228 2229MemInitResult 2230Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2231 Expr *Init, CXXRecordDecl *ClassDecl, 2232 SourceLocation EllipsisLoc) { 2233 SourceLocation BaseLoc 2234 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2235 2236 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2237 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2238 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2239 2240 // C++ [class.base.init]p2: 2241 // [...] Unless the mem-initializer-id names a nonstatic data 2242 // member of the constructor's class or a direct or virtual base 2243 // of that class, the mem-initializer is ill-formed. A 2244 // mem-initializer-list can initialize a base class using any 2245 // name that denotes that base class type. 2246 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2247 2248 SourceRange InitRange = Init->getSourceRange(); 2249 if (EllipsisLoc.isValid()) { 2250 // This is a pack expansion. 2251 if (!BaseType->containsUnexpandedParameterPack()) { 2252 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2253 << SourceRange(BaseLoc, InitRange.getEnd()); 2254 2255 EllipsisLoc = SourceLocation(); 2256 } 2257 } else { 2258 // Check for any unexpanded parameter packs. 2259 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2260 return true; 2261 2262 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2263 return true; 2264 } 2265 2266 // Check for direct and virtual base classes. 2267 const CXXBaseSpecifier *DirectBaseSpec = 0; 2268 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2269 if (!Dependent) { 2270 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2271 BaseType)) 2272 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2273 2274 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2275 VirtualBaseSpec); 2276 2277 // C++ [base.class.init]p2: 2278 // Unless the mem-initializer-id names a nonstatic data member of the 2279 // constructor's class or a direct or virtual base of that class, the 2280 // mem-initializer is ill-formed. 2281 if (!DirectBaseSpec && !VirtualBaseSpec) { 2282 // If the class has any dependent bases, then it's possible that 2283 // one of those types will resolve to the same type as 2284 // BaseType. Therefore, just treat this as a dependent base 2285 // class initialization. FIXME: Should we try to check the 2286 // initialization anyway? It seems odd. 2287 if (ClassDecl->hasAnyDependentBases()) 2288 Dependent = true; 2289 else 2290 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2291 << BaseType << Context.getTypeDeclType(ClassDecl) 2292 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2293 } 2294 } 2295 2296 if (Dependent) { 2297 DiscardCleanupsInEvaluationContext(); 2298 2299 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2300 /*IsVirtual=*/false, 2301 InitRange.getBegin(), Init, 2302 InitRange.getEnd(), EllipsisLoc); 2303 } 2304 2305 // C++ [base.class.init]p2: 2306 // If a mem-initializer-id is ambiguous because it designates both 2307 // a direct non-virtual base class and an inherited virtual base 2308 // class, the mem-initializer is ill-formed. 2309 if (DirectBaseSpec && VirtualBaseSpec) 2310 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2311 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2312 2313 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2314 if (!BaseSpec) 2315 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2316 2317 // Initialize the base. 2318 bool InitList = true; 2319 Expr **Args = &Init; 2320 unsigned NumArgs = 1; 2321 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2322 InitList = false; 2323 Args = ParenList->getExprs(); 2324 NumArgs = ParenList->getNumExprs(); 2325 } 2326 2327 InitializedEntity BaseEntity = 2328 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2329 InitializationKind Kind = 2330 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2331 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2332 InitRange.getEnd()); 2333 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 2334 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, 2335 MultiExprArg(*this, Args, NumArgs), 2336 0); 2337 if (BaseInit.isInvalid()) 2338 return true; 2339 2340 CheckImplicitConversions(BaseInit.get(), InitRange.getBegin()); 2341 2342 // C++0x [class.base.init]p7: 2343 // The initialization of each base and member constitutes a 2344 // full-expression. 2345 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2346 if (BaseInit.isInvalid()) 2347 return true; 2348 2349 // If we are in a dependent context, template instantiation will 2350 // perform this type-checking again. Just save the arguments that we 2351 // received in a ParenListExpr. 2352 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2353 // of the information that we have about the base 2354 // initializer. However, deconstructing the ASTs is a dicey process, 2355 // and this approach is far more likely to get the corner cases right. 2356 if (CurContext->isDependentContext()) 2357 BaseInit = Owned(Init); 2358 2359 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2360 BaseSpec->isVirtual(), 2361 InitRange.getBegin(), 2362 BaseInit.takeAs<Expr>(), 2363 InitRange.getEnd(), EllipsisLoc); 2364} 2365 2366// Create a static_cast\<T&&>(expr). 2367static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2368 QualType ExprType = E->getType(); 2369 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2370 SourceLocation ExprLoc = E->getLocStart(); 2371 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2372 TargetType, ExprLoc); 2373 2374 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2375 SourceRange(ExprLoc, ExprLoc), 2376 E->getSourceRange()).take(); 2377} 2378 2379/// ImplicitInitializerKind - How an implicit base or member initializer should 2380/// initialize its base or member. 2381enum ImplicitInitializerKind { 2382 IIK_Default, 2383 IIK_Copy, 2384 IIK_Move 2385}; 2386 2387static bool 2388BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2389 ImplicitInitializerKind ImplicitInitKind, 2390 CXXBaseSpecifier *BaseSpec, 2391 bool IsInheritedVirtualBase, 2392 CXXCtorInitializer *&CXXBaseInit) { 2393 InitializedEntity InitEntity 2394 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2395 IsInheritedVirtualBase); 2396 2397 ExprResult BaseInit; 2398 2399 switch (ImplicitInitKind) { 2400 case IIK_Default: { 2401 InitializationKind InitKind 2402 = InitializationKind::CreateDefault(Constructor->getLocation()); 2403 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2404 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2405 MultiExprArg(SemaRef, 0, 0)); 2406 break; 2407 } 2408 2409 case IIK_Move: 2410 case IIK_Copy: { 2411 bool Moving = ImplicitInitKind == IIK_Move; 2412 ParmVarDecl *Param = Constructor->getParamDecl(0); 2413 QualType ParamType = Param->getType().getNonReferenceType(); 2414 2415 Expr *CopyCtorArg = 2416 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2417 SourceLocation(), Param, 2418 Constructor->getLocation(), ParamType, 2419 VK_LValue, 0); 2420 2421 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2422 2423 // Cast to the base class to avoid ambiguities. 2424 QualType ArgTy = 2425 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2426 ParamType.getQualifiers()); 2427 2428 if (Moving) { 2429 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2430 } 2431 2432 CXXCastPath BasePath; 2433 BasePath.push_back(BaseSpec); 2434 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2435 CK_UncheckedDerivedToBase, 2436 Moving ? VK_XValue : VK_LValue, 2437 &BasePath).take(); 2438 2439 InitializationKind InitKind 2440 = InitializationKind::CreateDirect(Constructor->getLocation(), 2441 SourceLocation(), SourceLocation()); 2442 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2443 &CopyCtorArg, 1); 2444 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2445 MultiExprArg(&CopyCtorArg, 1)); 2446 break; 2447 } 2448 } 2449 2450 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2451 if (BaseInit.isInvalid()) 2452 return true; 2453 2454 CXXBaseInit = 2455 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2456 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2457 SourceLocation()), 2458 BaseSpec->isVirtual(), 2459 SourceLocation(), 2460 BaseInit.takeAs<Expr>(), 2461 SourceLocation(), 2462 SourceLocation()); 2463 2464 return false; 2465} 2466 2467static bool RefersToRValueRef(Expr *MemRef) { 2468 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2469 return Referenced->getType()->isRValueReferenceType(); 2470} 2471 2472static bool 2473BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2474 ImplicitInitializerKind ImplicitInitKind, 2475 FieldDecl *Field, IndirectFieldDecl *Indirect, 2476 CXXCtorInitializer *&CXXMemberInit) { 2477 if (Field->isInvalidDecl()) 2478 return true; 2479 2480 SourceLocation Loc = Constructor->getLocation(); 2481 2482 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2483 bool Moving = ImplicitInitKind == IIK_Move; 2484 ParmVarDecl *Param = Constructor->getParamDecl(0); 2485 QualType ParamType = Param->getType().getNonReferenceType(); 2486 2487 // Suppress copying zero-width bitfields. 2488 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2489 return false; 2490 2491 Expr *MemberExprBase = 2492 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2493 SourceLocation(), Param, 2494 Loc, ParamType, VK_LValue, 0); 2495 2496 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2497 2498 if (Moving) { 2499 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2500 } 2501 2502 // Build a reference to this field within the parameter. 2503 CXXScopeSpec SS; 2504 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2505 Sema::LookupMemberName); 2506 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2507 : cast<ValueDecl>(Field), AS_public); 2508 MemberLookup.resolveKind(); 2509 ExprResult CtorArg 2510 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2511 ParamType, Loc, 2512 /*IsArrow=*/false, 2513 SS, 2514 /*TemplateKWLoc=*/SourceLocation(), 2515 /*FirstQualifierInScope=*/0, 2516 MemberLookup, 2517 /*TemplateArgs=*/0); 2518 if (CtorArg.isInvalid()) 2519 return true; 2520 2521 // C++11 [class.copy]p15: 2522 // - if a member m has rvalue reference type T&&, it is direct-initialized 2523 // with static_cast<T&&>(x.m); 2524 if (RefersToRValueRef(CtorArg.get())) { 2525 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2526 } 2527 2528 // When the field we are copying is an array, create index variables for 2529 // each dimension of the array. We use these index variables to subscript 2530 // the source array, and other clients (e.g., CodeGen) will perform the 2531 // necessary iteration with these index variables. 2532 SmallVector<VarDecl *, 4> IndexVariables; 2533 QualType BaseType = Field->getType(); 2534 QualType SizeType = SemaRef.Context.getSizeType(); 2535 bool InitializingArray = false; 2536 while (const ConstantArrayType *Array 2537 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2538 InitializingArray = true; 2539 // Create the iteration variable for this array index. 2540 IdentifierInfo *IterationVarName = 0; 2541 { 2542 SmallString<8> Str; 2543 llvm::raw_svector_ostream OS(Str); 2544 OS << "__i" << IndexVariables.size(); 2545 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2546 } 2547 VarDecl *IterationVar 2548 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2549 IterationVarName, SizeType, 2550 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2551 SC_None, SC_None); 2552 IndexVariables.push_back(IterationVar); 2553 2554 // Create a reference to the iteration variable. 2555 ExprResult IterationVarRef 2556 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2557 assert(!IterationVarRef.isInvalid() && 2558 "Reference to invented variable cannot fail!"); 2559 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2560 assert(!IterationVarRef.isInvalid() && 2561 "Conversion of invented variable cannot fail!"); 2562 2563 // Subscript the array with this iteration variable. 2564 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2565 IterationVarRef.take(), 2566 Loc); 2567 if (CtorArg.isInvalid()) 2568 return true; 2569 2570 BaseType = Array->getElementType(); 2571 } 2572 2573 // The array subscript expression is an lvalue, which is wrong for moving. 2574 if (Moving && InitializingArray) 2575 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2576 2577 // Construct the entity that we will be initializing. For an array, this 2578 // will be first element in the array, which may require several levels 2579 // of array-subscript entities. 2580 SmallVector<InitializedEntity, 4> Entities; 2581 Entities.reserve(1 + IndexVariables.size()); 2582 if (Indirect) 2583 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2584 else 2585 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2586 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2587 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2588 0, 2589 Entities.back())); 2590 2591 // Direct-initialize to use the copy constructor. 2592 InitializationKind InitKind = 2593 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2594 2595 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2596 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2597 &CtorArgE, 1); 2598 2599 ExprResult MemberInit 2600 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2601 MultiExprArg(&CtorArgE, 1)); 2602 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2603 if (MemberInit.isInvalid()) 2604 return true; 2605 2606 if (Indirect) { 2607 assert(IndexVariables.size() == 0 && 2608 "Indirect field improperly initialized"); 2609 CXXMemberInit 2610 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2611 Loc, Loc, 2612 MemberInit.takeAs<Expr>(), 2613 Loc); 2614 } else 2615 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2616 Loc, MemberInit.takeAs<Expr>(), 2617 Loc, 2618 IndexVariables.data(), 2619 IndexVariables.size()); 2620 return false; 2621 } 2622 2623 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2624 2625 QualType FieldBaseElementType = 2626 SemaRef.Context.getBaseElementType(Field->getType()); 2627 2628 if (FieldBaseElementType->isRecordType()) { 2629 InitializedEntity InitEntity 2630 = Indirect? InitializedEntity::InitializeMember(Indirect) 2631 : InitializedEntity::InitializeMember(Field); 2632 InitializationKind InitKind = 2633 InitializationKind::CreateDefault(Loc); 2634 2635 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2636 ExprResult MemberInit = 2637 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2638 2639 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2640 if (MemberInit.isInvalid()) 2641 return true; 2642 2643 if (Indirect) 2644 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2645 Indirect, Loc, 2646 Loc, 2647 MemberInit.get(), 2648 Loc); 2649 else 2650 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2651 Field, Loc, Loc, 2652 MemberInit.get(), 2653 Loc); 2654 return false; 2655 } 2656 2657 if (!Field->getParent()->isUnion()) { 2658 if (FieldBaseElementType->isReferenceType()) { 2659 SemaRef.Diag(Constructor->getLocation(), 2660 diag::err_uninitialized_member_in_ctor) 2661 << (int)Constructor->isImplicit() 2662 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2663 << 0 << Field->getDeclName(); 2664 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2665 return true; 2666 } 2667 2668 if (FieldBaseElementType.isConstQualified()) { 2669 SemaRef.Diag(Constructor->getLocation(), 2670 diag::err_uninitialized_member_in_ctor) 2671 << (int)Constructor->isImplicit() 2672 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2673 << 1 << Field->getDeclName(); 2674 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2675 return true; 2676 } 2677 } 2678 2679 if (SemaRef.getLangOptions().ObjCAutoRefCount && 2680 FieldBaseElementType->isObjCRetainableType() && 2681 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2682 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2683 // Instant objects: 2684 // Default-initialize Objective-C pointers to NULL. 2685 CXXMemberInit 2686 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2687 Loc, Loc, 2688 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2689 Loc); 2690 return false; 2691 } 2692 2693 // Nothing to initialize. 2694 CXXMemberInit = 0; 2695 return false; 2696} 2697 2698namespace { 2699struct BaseAndFieldInfo { 2700 Sema &S; 2701 CXXConstructorDecl *Ctor; 2702 bool AnyErrorsInInits; 2703 ImplicitInitializerKind IIK; 2704 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2705 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2706 2707 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2708 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2709 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2710 if (Generated && Ctor->isCopyConstructor()) 2711 IIK = IIK_Copy; 2712 else if (Generated && Ctor->isMoveConstructor()) 2713 IIK = IIK_Move; 2714 else 2715 IIK = IIK_Default; 2716 } 2717 2718 bool isImplicitCopyOrMove() const { 2719 switch (IIK) { 2720 case IIK_Copy: 2721 case IIK_Move: 2722 return true; 2723 2724 case IIK_Default: 2725 return false; 2726 } 2727 2728 llvm_unreachable("Invalid ImplicitInitializerKind!"); 2729 } 2730}; 2731} 2732 2733/// \brief Determine whether the given indirect field declaration is somewhere 2734/// within an anonymous union. 2735static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2736 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2737 CEnd = F->chain_end(); 2738 C != CEnd; ++C) 2739 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2740 if (Record->isUnion()) 2741 return true; 2742 2743 return false; 2744} 2745 2746/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2747/// array type. 2748static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2749 if (T->isIncompleteArrayType()) 2750 return true; 2751 2752 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2753 if (!ArrayT->getSize()) 2754 return true; 2755 2756 T = ArrayT->getElementType(); 2757 } 2758 2759 return false; 2760} 2761 2762static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2763 FieldDecl *Field, 2764 IndirectFieldDecl *Indirect = 0) { 2765 2766 // Overwhelmingly common case: we have a direct initializer for this field. 2767 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2768 Info.AllToInit.push_back(Init); 2769 return false; 2770 } 2771 2772 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2773 // has a brace-or-equal-initializer, the entity is initialized as specified 2774 // in [dcl.init]. 2775 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 2776 CXXCtorInitializer *Init; 2777 if (Indirect) 2778 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2779 SourceLocation(), 2780 SourceLocation(), 0, 2781 SourceLocation()); 2782 else 2783 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2784 SourceLocation(), 2785 SourceLocation(), 0, 2786 SourceLocation()); 2787 Info.AllToInit.push_back(Init); 2788 return false; 2789 } 2790 2791 // Don't build an implicit initializer for union members if none was 2792 // explicitly specified. 2793 if (Field->getParent()->isUnion() || 2794 (Indirect && isWithinAnonymousUnion(Indirect))) 2795 return false; 2796 2797 // Don't initialize incomplete or zero-length arrays. 2798 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 2799 return false; 2800 2801 // Don't try to build an implicit initializer if there were semantic 2802 // errors in any of the initializers (and therefore we might be 2803 // missing some that the user actually wrote). 2804 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2805 return false; 2806 2807 CXXCtorInitializer *Init = 0; 2808 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2809 Indirect, Init)) 2810 return true; 2811 2812 if (Init) 2813 Info.AllToInit.push_back(Init); 2814 2815 return false; 2816} 2817 2818bool 2819Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2820 CXXCtorInitializer *Initializer) { 2821 assert(Initializer->isDelegatingInitializer()); 2822 Constructor->setNumCtorInitializers(1); 2823 CXXCtorInitializer **initializer = 2824 new (Context) CXXCtorInitializer*[1]; 2825 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2826 Constructor->setCtorInitializers(initializer); 2827 2828 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2829 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 2830 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2831 } 2832 2833 DelegatingCtorDecls.push_back(Constructor); 2834 2835 return false; 2836} 2837 2838bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2839 CXXCtorInitializer **Initializers, 2840 unsigned NumInitializers, 2841 bool AnyErrors) { 2842 if (Constructor->isDependentContext()) { 2843 // Just store the initializers as written, they will be checked during 2844 // instantiation. 2845 if (NumInitializers > 0) { 2846 Constructor->setNumCtorInitializers(NumInitializers); 2847 CXXCtorInitializer **baseOrMemberInitializers = 2848 new (Context) CXXCtorInitializer*[NumInitializers]; 2849 memcpy(baseOrMemberInitializers, Initializers, 2850 NumInitializers * sizeof(CXXCtorInitializer*)); 2851 Constructor->setCtorInitializers(baseOrMemberInitializers); 2852 } 2853 2854 return false; 2855 } 2856 2857 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2858 2859 // We need to build the initializer AST according to order of construction 2860 // and not what user specified in the Initializers list. 2861 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2862 if (!ClassDecl) 2863 return true; 2864 2865 bool HadError = false; 2866 2867 for (unsigned i = 0; i < NumInitializers; i++) { 2868 CXXCtorInitializer *Member = Initializers[i]; 2869 2870 if (Member->isBaseInitializer()) 2871 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2872 else 2873 Info.AllBaseFields[Member->getAnyMember()] = Member; 2874 } 2875 2876 // Keep track of the direct virtual bases. 2877 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2878 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2879 E = ClassDecl->bases_end(); I != E; ++I) { 2880 if (I->isVirtual()) 2881 DirectVBases.insert(I); 2882 } 2883 2884 // Push virtual bases before others. 2885 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2886 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2887 2888 if (CXXCtorInitializer *Value 2889 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2890 Info.AllToInit.push_back(Value); 2891 } else if (!AnyErrors) { 2892 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2893 CXXCtorInitializer *CXXBaseInit; 2894 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2895 VBase, IsInheritedVirtualBase, 2896 CXXBaseInit)) { 2897 HadError = true; 2898 continue; 2899 } 2900 2901 Info.AllToInit.push_back(CXXBaseInit); 2902 } 2903 } 2904 2905 // Non-virtual bases. 2906 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2907 E = ClassDecl->bases_end(); Base != E; ++Base) { 2908 // Virtuals are in the virtual base list and already constructed. 2909 if (Base->isVirtual()) 2910 continue; 2911 2912 if (CXXCtorInitializer *Value 2913 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2914 Info.AllToInit.push_back(Value); 2915 } else if (!AnyErrors) { 2916 CXXCtorInitializer *CXXBaseInit; 2917 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2918 Base, /*IsInheritedVirtualBase=*/false, 2919 CXXBaseInit)) { 2920 HadError = true; 2921 continue; 2922 } 2923 2924 Info.AllToInit.push_back(CXXBaseInit); 2925 } 2926 } 2927 2928 // Fields. 2929 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 2930 MemEnd = ClassDecl->decls_end(); 2931 Mem != MemEnd; ++Mem) { 2932 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 2933 // C++ [class.bit]p2: 2934 // A declaration for a bit-field that omits the identifier declares an 2935 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 2936 // initialized. 2937 if (F->isUnnamedBitfield()) 2938 continue; 2939 2940 // If we're not generating the implicit copy/move constructor, then we'll 2941 // handle anonymous struct/union fields based on their individual 2942 // indirect fields. 2943 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 2944 continue; 2945 2946 if (CollectFieldInitializer(*this, Info, F)) 2947 HadError = true; 2948 continue; 2949 } 2950 2951 // Beyond this point, we only consider default initialization. 2952 if (Info.IIK != IIK_Default) 2953 continue; 2954 2955 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 2956 if (F->getType()->isIncompleteArrayType()) { 2957 assert(ClassDecl->hasFlexibleArrayMember() && 2958 "Incomplete array type is not valid"); 2959 continue; 2960 } 2961 2962 // Initialize each field of an anonymous struct individually. 2963 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 2964 HadError = true; 2965 2966 continue; 2967 } 2968 } 2969 2970 NumInitializers = Info.AllToInit.size(); 2971 if (NumInitializers > 0) { 2972 Constructor->setNumCtorInitializers(NumInitializers); 2973 CXXCtorInitializer **baseOrMemberInitializers = 2974 new (Context) CXXCtorInitializer*[NumInitializers]; 2975 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2976 NumInitializers * sizeof(CXXCtorInitializer*)); 2977 Constructor->setCtorInitializers(baseOrMemberInitializers); 2978 2979 // Constructors implicitly reference the base and member 2980 // destructors. 2981 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2982 Constructor->getParent()); 2983 } 2984 2985 return HadError; 2986} 2987 2988static void *GetKeyForTopLevelField(FieldDecl *Field) { 2989 // For anonymous unions, use the class declaration as the key. 2990 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2991 if (RT->getDecl()->isAnonymousStructOrUnion()) 2992 return static_cast<void *>(RT->getDecl()); 2993 } 2994 return static_cast<void *>(Field); 2995} 2996 2997static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2998 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2999} 3000 3001static void *GetKeyForMember(ASTContext &Context, 3002 CXXCtorInitializer *Member) { 3003 if (!Member->isAnyMemberInitializer()) 3004 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3005 3006 // For fields injected into the class via declaration of an anonymous union, 3007 // use its anonymous union class declaration as the unique key. 3008 FieldDecl *Field = Member->getAnyMember(); 3009 3010 // If the field is a member of an anonymous struct or union, our key 3011 // is the anonymous record decl that's a direct child of the class. 3012 RecordDecl *RD = Field->getParent(); 3013 if (RD->isAnonymousStructOrUnion()) { 3014 while (true) { 3015 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 3016 if (Parent->isAnonymousStructOrUnion()) 3017 RD = Parent; 3018 else 3019 break; 3020 } 3021 3022 return static_cast<void *>(RD); 3023 } 3024 3025 return static_cast<void *>(Field); 3026} 3027 3028static void 3029DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 3030 const CXXConstructorDecl *Constructor, 3031 CXXCtorInitializer **Inits, 3032 unsigned NumInits) { 3033 if (Constructor->getDeclContext()->isDependentContext()) 3034 return; 3035 3036 // Don't check initializers order unless the warning is enabled at the 3037 // location of at least one initializer. 3038 bool ShouldCheckOrder = false; 3039 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3040 CXXCtorInitializer *Init = Inits[InitIndex]; 3041 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3042 Init->getSourceLocation()) 3043 != DiagnosticsEngine::Ignored) { 3044 ShouldCheckOrder = true; 3045 break; 3046 } 3047 } 3048 if (!ShouldCheckOrder) 3049 return; 3050 3051 // Build the list of bases and members in the order that they'll 3052 // actually be initialized. The explicit initializers should be in 3053 // this same order but may be missing things. 3054 SmallVector<const void*, 32> IdealInitKeys; 3055 3056 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3057 3058 // 1. Virtual bases. 3059 for (CXXRecordDecl::base_class_const_iterator VBase = 3060 ClassDecl->vbases_begin(), 3061 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3062 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3063 3064 // 2. Non-virtual bases. 3065 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3066 E = ClassDecl->bases_end(); Base != E; ++Base) { 3067 if (Base->isVirtual()) 3068 continue; 3069 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3070 } 3071 3072 // 3. Direct fields. 3073 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3074 E = ClassDecl->field_end(); Field != E; ++Field) { 3075 if (Field->isUnnamedBitfield()) 3076 continue; 3077 3078 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 3079 } 3080 3081 unsigned NumIdealInits = IdealInitKeys.size(); 3082 unsigned IdealIndex = 0; 3083 3084 CXXCtorInitializer *PrevInit = 0; 3085 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3086 CXXCtorInitializer *Init = Inits[InitIndex]; 3087 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3088 3089 // Scan forward to try to find this initializer in the idealized 3090 // initializers list. 3091 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3092 if (InitKey == IdealInitKeys[IdealIndex]) 3093 break; 3094 3095 // If we didn't find this initializer, it must be because we 3096 // scanned past it on a previous iteration. That can only 3097 // happen if we're out of order; emit a warning. 3098 if (IdealIndex == NumIdealInits && PrevInit) { 3099 Sema::SemaDiagnosticBuilder D = 3100 SemaRef.Diag(PrevInit->getSourceLocation(), 3101 diag::warn_initializer_out_of_order); 3102 3103 if (PrevInit->isAnyMemberInitializer()) 3104 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3105 else 3106 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3107 3108 if (Init->isAnyMemberInitializer()) 3109 D << 0 << Init->getAnyMember()->getDeclName(); 3110 else 3111 D << 1 << Init->getTypeSourceInfo()->getType(); 3112 3113 // Move back to the initializer's location in the ideal list. 3114 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3115 if (InitKey == IdealInitKeys[IdealIndex]) 3116 break; 3117 3118 assert(IdealIndex != NumIdealInits && 3119 "initializer not found in initializer list"); 3120 } 3121 3122 PrevInit = Init; 3123 } 3124} 3125 3126namespace { 3127bool CheckRedundantInit(Sema &S, 3128 CXXCtorInitializer *Init, 3129 CXXCtorInitializer *&PrevInit) { 3130 if (!PrevInit) { 3131 PrevInit = Init; 3132 return false; 3133 } 3134 3135 if (FieldDecl *Field = Init->getMember()) 3136 S.Diag(Init->getSourceLocation(), 3137 diag::err_multiple_mem_initialization) 3138 << Field->getDeclName() 3139 << Init->getSourceRange(); 3140 else { 3141 const Type *BaseClass = Init->getBaseClass(); 3142 assert(BaseClass && "neither field nor base"); 3143 S.Diag(Init->getSourceLocation(), 3144 diag::err_multiple_base_initialization) 3145 << QualType(BaseClass, 0) 3146 << Init->getSourceRange(); 3147 } 3148 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3149 << 0 << PrevInit->getSourceRange(); 3150 3151 return true; 3152} 3153 3154typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3155typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3156 3157bool CheckRedundantUnionInit(Sema &S, 3158 CXXCtorInitializer *Init, 3159 RedundantUnionMap &Unions) { 3160 FieldDecl *Field = Init->getAnyMember(); 3161 RecordDecl *Parent = Field->getParent(); 3162 NamedDecl *Child = Field; 3163 3164 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3165 if (Parent->isUnion()) { 3166 UnionEntry &En = Unions[Parent]; 3167 if (En.first && En.first != Child) { 3168 S.Diag(Init->getSourceLocation(), 3169 diag::err_multiple_mem_union_initialization) 3170 << Field->getDeclName() 3171 << Init->getSourceRange(); 3172 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3173 << 0 << En.second->getSourceRange(); 3174 return true; 3175 } 3176 if (!En.first) { 3177 En.first = Child; 3178 En.second = Init; 3179 } 3180 if (!Parent->isAnonymousStructOrUnion()) 3181 return false; 3182 } 3183 3184 Child = Parent; 3185 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3186 } 3187 3188 return false; 3189} 3190} 3191 3192/// ActOnMemInitializers - Handle the member initializers for a constructor. 3193void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3194 SourceLocation ColonLoc, 3195 CXXCtorInitializer **meminits, 3196 unsigned NumMemInits, 3197 bool AnyErrors) { 3198 if (!ConstructorDecl) 3199 return; 3200 3201 AdjustDeclIfTemplate(ConstructorDecl); 3202 3203 CXXConstructorDecl *Constructor 3204 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3205 3206 if (!Constructor) { 3207 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3208 return; 3209 } 3210 3211 CXXCtorInitializer **MemInits = 3212 reinterpret_cast<CXXCtorInitializer **>(meminits); 3213 3214 // Mapping for the duplicate initializers check. 3215 // For member initializers, this is keyed with a FieldDecl*. 3216 // For base initializers, this is keyed with a Type*. 3217 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3218 3219 // Mapping for the inconsistent anonymous-union initializers check. 3220 RedundantUnionMap MemberUnions; 3221 3222 bool HadError = false; 3223 for (unsigned i = 0; i < NumMemInits; i++) { 3224 CXXCtorInitializer *Init = MemInits[i]; 3225 3226 // Set the source order index. 3227 Init->setSourceOrder(i); 3228 3229 if (Init->isAnyMemberInitializer()) { 3230 FieldDecl *Field = Init->getAnyMember(); 3231 if (CheckRedundantInit(*this, Init, Members[Field]) || 3232 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3233 HadError = true; 3234 } else if (Init->isBaseInitializer()) { 3235 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3236 if (CheckRedundantInit(*this, Init, Members[Key])) 3237 HadError = true; 3238 } else { 3239 assert(Init->isDelegatingInitializer()); 3240 // This must be the only initializer 3241 if (i != 0 || NumMemInits > 1) { 3242 Diag(MemInits[0]->getSourceLocation(), 3243 diag::err_delegating_initializer_alone) 3244 << MemInits[0]->getSourceRange(); 3245 HadError = true; 3246 // We will treat this as being the only initializer. 3247 } 3248 SetDelegatingInitializer(Constructor, MemInits[i]); 3249 // Return immediately as the initializer is set. 3250 return; 3251 } 3252 } 3253 3254 if (HadError) 3255 return; 3256 3257 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3258 3259 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3260} 3261 3262void 3263Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3264 CXXRecordDecl *ClassDecl) { 3265 // Ignore dependent contexts. Also ignore unions, since their members never 3266 // have destructors implicitly called. 3267 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3268 return; 3269 3270 // FIXME: all the access-control diagnostics are positioned on the 3271 // field/base declaration. That's probably good; that said, the 3272 // user might reasonably want to know why the destructor is being 3273 // emitted, and we currently don't say. 3274 3275 // Non-static data members. 3276 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3277 E = ClassDecl->field_end(); I != E; ++I) { 3278 FieldDecl *Field = *I; 3279 if (Field->isInvalidDecl()) 3280 continue; 3281 3282 // Don't destroy incomplete or zero-length arrays. 3283 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3284 continue; 3285 3286 QualType FieldType = Context.getBaseElementType(Field->getType()); 3287 3288 const RecordType* RT = FieldType->getAs<RecordType>(); 3289 if (!RT) 3290 continue; 3291 3292 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3293 if (FieldClassDecl->isInvalidDecl()) 3294 continue; 3295 if (FieldClassDecl->hasIrrelevantDestructor()) 3296 continue; 3297 3298 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3299 assert(Dtor && "No dtor found for FieldClassDecl!"); 3300 CheckDestructorAccess(Field->getLocation(), Dtor, 3301 PDiag(diag::err_access_dtor_field) 3302 << Field->getDeclName() 3303 << FieldType); 3304 3305 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3306 DiagnoseUseOfDecl(Dtor, Location); 3307 } 3308 3309 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3310 3311 // Bases. 3312 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3313 E = ClassDecl->bases_end(); Base != E; ++Base) { 3314 // Bases are always records in a well-formed non-dependent class. 3315 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3316 3317 // Remember direct virtual bases. 3318 if (Base->isVirtual()) 3319 DirectVirtualBases.insert(RT); 3320 3321 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3322 // If our base class is invalid, we probably can't get its dtor anyway. 3323 if (BaseClassDecl->isInvalidDecl()) 3324 continue; 3325 if (BaseClassDecl->hasIrrelevantDestructor()) 3326 continue; 3327 3328 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3329 assert(Dtor && "No dtor found for BaseClassDecl!"); 3330 3331 // FIXME: caret should be on the start of the class name 3332 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 3333 PDiag(diag::err_access_dtor_base) 3334 << Base->getType() 3335 << Base->getSourceRange()); 3336 3337 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3338 DiagnoseUseOfDecl(Dtor, Location); 3339 } 3340 3341 // Virtual bases. 3342 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3343 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3344 3345 // Bases are always records in a well-formed non-dependent class. 3346 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 3347 3348 // Ignore direct virtual bases. 3349 if (DirectVirtualBases.count(RT)) 3350 continue; 3351 3352 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3353 // If our base class is invalid, we probably can't get its dtor anyway. 3354 if (BaseClassDecl->isInvalidDecl()) 3355 continue; 3356 if (BaseClassDecl->hasIrrelevantDestructor()) 3357 continue; 3358 3359 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3360 assert(Dtor && "No dtor found for BaseClassDecl!"); 3361 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3362 PDiag(diag::err_access_dtor_vbase) 3363 << VBase->getType()); 3364 3365 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3366 DiagnoseUseOfDecl(Dtor, Location); 3367 } 3368} 3369 3370void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3371 if (!CDtorDecl) 3372 return; 3373 3374 if (CXXConstructorDecl *Constructor 3375 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3376 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3377} 3378 3379bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3380 unsigned DiagID, AbstractDiagSelID SelID) { 3381 if (SelID == -1) 3382 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 3383 else 3384 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 3385} 3386 3387bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3388 const PartialDiagnostic &PD) { 3389 if (!getLangOptions().CPlusPlus) 3390 return false; 3391 3392 if (const ArrayType *AT = Context.getAsArrayType(T)) 3393 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3394 3395 if (const PointerType *PT = T->getAs<PointerType>()) { 3396 // Find the innermost pointer type. 3397 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3398 PT = T; 3399 3400 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3401 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3402 } 3403 3404 const RecordType *RT = T->getAs<RecordType>(); 3405 if (!RT) 3406 return false; 3407 3408 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3409 3410 // We can't answer whether something is abstract until it has a 3411 // definition. If it's currently being defined, we'll walk back 3412 // over all the declarations when we have a full definition. 3413 const CXXRecordDecl *Def = RD->getDefinition(); 3414 if (!Def || Def->isBeingDefined()) 3415 return false; 3416 3417 if (!RD->isAbstract()) 3418 return false; 3419 3420 Diag(Loc, PD) << RD->getDeclName(); 3421 DiagnoseAbstractType(RD); 3422 3423 return true; 3424} 3425 3426void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3427 // Check if we've already emitted the list of pure virtual functions 3428 // for this class. 3429 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3430 return; 3431 3432 CXXFinalOverriderMap FinalOverriders; 3433 RD->getFinalOverriders(FinalOverriders); 3434 3435 // Keep a set of seen pure methods so we won't diagnose the same method 3436 // more than once. 3437 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3438 3439 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3440 MEnd = FinalOverriders.end(); 3441 M != MEnd; 3442 ++M) { 3443 for (OverridingMethods::iterator SO = M->second.begin(), 3444 SOEnd = M->second.end(); 3445 SO != SOEnd; ++SO) { 3446 // C++ [class.abstract]p4: 3447 // A class is abstract if it contains or inherits at least one 3448 // pure virtual function for which the final overrider is pure 3449 // virtual. 3450 3451 // 3452 if (SO->second.size() != 1) 3453 continue; 3454 3455 if (!SO->second.front().Method->isPure()) 3456 continue; 3457 3458 if (!SeenPureMethods.insert(SO->second.front().Method)) 3459 continue; 3460 3461 Diag(SO->second.front().Method->getLocation(), 3462 diag::note_pure_virtual_function) 3463 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3464 } 3465 } 3466 3467 if (!PureVirtualClassDiagSet) 3468 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3469 PureVirtualClassDiagSet->insert(RD); 3470} 3471 3472namespace { 3473struct AbstractUsageInfo { 3474 Sema &S; 3475 CXXRecordDecl *Record; 3476 CanQualType AbstractType; 3477 bool Invalid; 3478 3479 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3480 : S(S), Record(Record), 3481 AbstractType(S.Context.getCanonicalType( 3482 S.Context.getTypeDeclType(Record))), 3483 Invalid(false) {} 3484 3485 void DiagnoseAbstractType() { 3486 if (Invalid) return; 3487 S.DiagnoseAbstractType(Record); 3488 Invalid = true; 3489 } 3490 3491 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3492}; 3493 3494struct CheckAbstractUsage { 3495 AbstractUsageInfo &Info; 3496 const NamedDecl *Ctx; 3497 3498 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3499 : Info(Info), Ctx(Ctx) {} 3500 3501 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3502 switch (TL.getTypeLocClass()) { 3503#define ABSTRACT_TYPELOC(CLASS, PARENT) 3504#define TYPELOC(CLASS, PARENT) \ 3505 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3506#include "clang/AST/TypeLocNodes.def" 3507 } 3508 } 3509 3510 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3511 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3512 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3513 if (!TL.getArg(I)) 3514 continue; 3515 3516 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3517 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3518 } 3519 } 3520 3521 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3522 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3523 } 3524 3525 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3526 // Visit the type parameters from a permissive context. 3527 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3528 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3529 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3530 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3531 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3532 // TODO: other template argument types? 3533 } 3534 } 3535 3536 // Visit pointee types from a permissive context. 3537#define CheckPolymorphic(Type) \ 3538 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3539 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3540 } 3541 CheckPolymorphic(PointerTypeLoc) 3542 CheckPolymorphic(ReferenceTypeLoc) 3543 CheckPolymorphic(MemberPointerTypeLoc) 3544 CheckPolymorphic(BlockPointerTypeLoc) 3545 CheckPolymorphic(AtomicTypeLoc) 3546 3547 /// Handle all the types we haven't given a more specific 3548 /// implementation for above. 3549 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3550 // Every other kind of type that we haven't called out already 3551 // that has an inner type is either (1) sugar or (2) contains that 3552 // inner type in some way as a subobject. 3553 if (TypeLoc Next = TL.getNextTypeLoc()) 3554 return Visit(Next, Sel); 3555 3556 // If there's no inner type and we're in a permissive context, 3557 // don't diagnose. 3558 if (Sel == Sema::AbstractNone) return; 3559 3560 // Check whether the type matches the abstract type. 3561 QualType T = TL.getType(); 3562 if (T->isArrayType()) { 3563 Sel = Sema::AbstractArrayType; 3564 T = Info.S.Context.getBaseElementType(T); 3565 } 3566 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3567 if (CT != Info.AbstractType) return; 3568 3569 // It matched; do some magic. 3570 if (Sel == Sema::AbstractArrayType) { 3571 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3572 << T << TL.getSourceRange(); 3573 } else { 3574 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3575 << Sel << T << TL.getSourceRange(); 3576 } 3577 Info.DiagnoseAbstractType(); 3578 } 3579}; 3580 3581void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3582 Sema::AbstractDiagSelID Sel) { 3583 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3584} 3585 3586} 3587 3588/// Check for invalid uses of an abstract type in a method declaration. 3589static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3590 CXXMethodDecl *MD) { 3591 // No need to do the check on definitions, which require that 3592 // the return/param types be complete. 3593 if (MD->doesThisDeclarationHaveABody()) 3594 return; 3595 3596 // For safety's sake, just ignore it if we don't have type source 3597 // information. This should never happen for non-implicit methods, 3598 // but... 3599 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3600 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3601} 3602 3603/// Check for invalid uses of an abstract type within a class definition. 3604static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3605 CXXRecordDecl *RD) { 3606 for (CXXRecordDecl::decl_iterator 3607 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3608 Decl *D = *I; 3609 if (D->isImplicit()) continue; 3610 3611 // Methods and method templates. 3612 if (isa<CXXMethodDecl>(D)) { 3613 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3614 } else if (isa<FunctionTemplateDecl>(D)) { 3615 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3616 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3617 3618 // Fields and static variables. 3619 } else if (isa<FieldDecl>(D)) { 3620 FieldDecl *FD = cast<FieldDecl>(D); 3621 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3622 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3623 } else if (isa<VarDecl>(D)) { 3624 VarDecl *VD = cast<VarDecl>(D); 3625 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3626 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3627 3628 // Nested classes and class templates. 3629 } else if (isa<CXXRecordDecl>(D)) { 3630 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3631 } else if (isa<ClassTemplateDecl>(D)) { 3632 CheckAbstractClassUsage(Info, 3633 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3634 } 3635 } 3636} 3637 3638/// \brief Perform semantic checks on a class definition that has been 3639/// completing, introducing implicitly-declared members, checking for 3640/// abstract types, etc. 3641void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3642 if (!Record) 3643 return; 3644 3645 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3646 AbstractUsageInfo Info(*this, Record); 3647 CheckAbstractClassUsage(Info, Record); 3648 } 3649 3650 // If this is not an aggregate type and has no user-declared constructor, 3651 // complain about any non-static data members of reference or const scalar 3652 // type, since they will never get initializers. 3653 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3654 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 3655 !Record->isLambda()) { 3656 bool Complained = false; 3657 for (RecordDecl::field_iterator F = Record->field_begin(), 3658 FEnd = Record->field_end(); 3659 F != FEnd; ++F) { 3660 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3661 continue; 3662 3663 if (F->getType()->isReferenceType() || 3664 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3665 if (!Complained) { 3666 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3667 << Record->getTagKind() << Record; 3668 Complained = true; 3669 } 3670 3671 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3672 << F->getType()->isReferenceType() 3673 << F->getDeclName(); 3674 } 3675 } 3676 } 3677 3678 if (Record->isDynamicClass() && !Record->isDependentType()) 3679 DynamicClasses.push_back(Record); 3680 3681 if (Record->getIdentifier()) { 3682 // C++ [class.mem]p13: 3683 // If T is the name of a class, then each of the following shall have a 3684 // name different from T: 3685 // - every member of every anonymous union that is a member of class T. 3686 // 3687 // C++ [class.mem]p14: 3688 // In addition, if class T has a user-declared constructor (12.1), every 3689 // non-static data member of class T shall have a name different from T. 3690 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3691 R.first != R.second; ++R.first) { 3692 NamedDecl *D = *R.first; 3693 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3694 isa<IndirectFieldDecl>(D)) { 3695 Diag(D->getLocation(), diag::err_member_name_of_class) 3696 << D->getDeclName(); 3697 break; 3698 } 3699 } 3700 } 3701 3702 // Warn if the class has virtual methods but non-virtual public destructor. 3703 if (Record->isPolymorphic() && !Record->isDependentType()) { 3704 CXXDestructorDecl *dtor = Record->getDestructor(); 3705 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3706 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3707 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3708 } 3709 3710 // See if a method overloads virtual methods in a base 3711 /// class without overriding any. 3712 if (!Record->isDependentType()) { 3713 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3714 MEnd = Record->method_end(); 3715 M != MEnd; ++M) { 3716 if (!(*M)->isStatic()) 3717 DiagnoseHiddenVirtualMethods(Record, *M); 3718 } 3719 } 3720 3721 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3722 // function that is not a constructor declares that member function to be 3723 // const. [...] The class of which that function is a member shall be 3724 // a literal type. 3725 // 3726 // If the class has virtual bases, any constexpr members will already have 3727 // been diagnosed by the checks performed on the member declaration, so 3728 // suppress this (less useful) diagnostic. 3729 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3730 !Record->isLiteral() && !Record->getNumVBases()) { 3731 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3732 MEnd = Record->method_end(); 3733 M != MEnd; ++M) { 3734 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 3735 switch (Record->getTemplateSpecializationKind()) { 3736 case TSK_ImplicitInstantiation: 3737 case TSK_ExplicitInstantiationDeclaration: 3738 case TSK_ExplicitInstantiationDefinition: 3739 // If a template instantiates to a non-literal type, but its members 3740 // instantiate to constexpr functions, the template is technically 3741 // ill-formed, but we allow it for sanity. 3742 continue; 3743 3744 case TSK_Undeclared: 3745 case TSK_ExplicitSpecialization: 3746 RequireLiteralType((*M)->getLocation(), Context.getRecordType(Record), 3747 PDiag(diag::err_constexpr_method_non_literal)); 3748 break; 3749 } 3750 3751 // Only produce one error per class. 3752 break; 3753 } 3754 } 3755 } 3756 3757 // Declare inherited constructors. We do this eagerly here because: 3758 // - The standard requires an eager diagnostic for conflicting inherited 3759 // constructors from different classes. 3760 // - The lazy declaration of the other implicit constructors is so as to not 3761 // waste space and performance on classes that are not meant to be 3762 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3763 // have inherited constructors. 3764 DeclareInheritedConstructors(Record); 3765 3766 if (!Record->isDependentType()) 3767 CheckExplicitlyDefaultedMethods(Record); 3768} 3769 3770void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3771 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3772 ME = Record->method_end(); 3773 MI != ME; ++MI) { 3774 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3775 switch (getSpecialMember(*MI)) { 3776 case CXXDefaultConstructor: 3777 CheckExplicitlyDefaultedDefaultConstructor( 3778 cast<CXXConstructorDecl>(*MI)); 3779 break; 3780 3781 case CXXDestructor: 3782 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3783 break; 3784 3785 case CXXCopyConstructor: 3786 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3787 break; 3788 3789 case CXXCopyAssignment: 3790 CheckExplicitlyDefaultedCopyAssignment(*MI); 3791 break; 3792 3793 case CXXMoveConstructor: 3794 CheckExplicitlyDefaultedMoveConstructor(cast<CXXConstructorDecl>(*MI)); 3795 break; 3796 3797 case CXXMoveAssignment: 3798 CheckExplicitlyDefaultedMoveAssignment(*MI); 3799 break; 3800 3801 case CXXInvalid: 3802 llvm_unreachable("non-special member explicitly defaulted!"); 3803 } 3804 } 3805 } 3806 3807} 3808 3809void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3810 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3811 3812 // Whether this was the first-declared instance of the constructor. 3813 // This affects whether we implicitly add an exception spec (and, eventually, 3814 // constexpr). It is also ill-formed to explicitly default a constructor such 3815 // that it would be deleted. (C++0x [decl.fct.def.default]) 3816 bool First = CD == CD->getCanonicalDecl(); 3817 3818 bool HadError = false; 3819 if (CD->getNumParams() != 0) { 3820 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3821 << CD->getSourceRange(); 3822 HadError = true; 3823 } 3824 3825 ImplicitExceptionSpecification Spec 3826 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3827 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3828 if (EPI.ExceptionSpecType == EST_Delayed) { 3829 // Exception specification depends on some deferred part of the class. We'll 3830 // try again when the class's definition has been fully processed. 3831 return; 3832 } 3833 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3834 *ExceptionType = Context.getFunctionType( 3835 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3836 3837 // C++11 [dcl.fct.def.default]p2: 3838 // An explicitly-defaulted function may be declared constexpr only if it 3839 // would have been implicitly declared as constexpr, 3840 // Do not apply this rule to templates, since core issue 1358 makes such 3841 // functions always instantiate to constexpr functions. 3842 if (CD->isConstexpr() && 3843 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 3844 if (!CD->getParent()->defaultedDefaultConstructorIsConstexpr()) { 3845 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3846 << CXXDefaultConstructor; 3847 HadError = true; 3848 } 3849 } 3850 // and may have an explicit exception-specification only if it is compatible 3851 // with the exception-specification on the implicit declaration. 3852 if (CtorType->hasExceptionSpec()) { 3853 if (CheckEquivalentExceptionSpec( 3854 PDiag(diag::err_incorrect_defaulted_exception_spec) 3855 << CXXDefaultConstructor, 3856 PDiag(), 3857 ExceptionType, SourceLocation(), 3858 CtorType, CD->getLocation())) { 3859 HadError = true; 3860 } 3861 } 3862 3863 // If a function is explicitly defaulted on its first declaration, 3864 if (First) { 3865 // -- it is implicitly considered to be constexpr if the implicit 3866 // definition would be, 3867 CD->setConstexpr(CD->getParent()->defaultedDefaultConstructorIsConstexpr()); 3868 3869 // -- it is implicitly considered to have the same 3870 // exception-specification as if it had been implicitly declared 3871 // 3872 // FIXME: a compatible, but different, explicit exception specification 3873 // will be silently overridden. We should issue a warning if this happens. 3874 EPI.ExtInfo = CtorType->getExtInfo(); 3875 } 3876 3877 if (HadError) { 3878 CD->setInvalidDecl(); 3879 return; 3880 } 3881 3882 if (ShouldDeleteSpecialMember(CD, CXXDefaultConstructor)) { 3883 if (First) { 3884 CD->setDeletedAsWritten(); 3885 } else { 3886 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3887 << CXXDefaultConstructor; 3888 CD->setInvalidDecl(); 3889 } 3890 } 3891} 3892 3893void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3894 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3895 3896 // Whether this was the first-declared instance of the constructor. 3897 bool First = CD == CD->getCanonicalDecl(); 3898 3899 bool HadError = false; 3900 if (CD->getNumParams() != 1) { 3901 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3902 << CD->getSourceRange(); 3903 HadError = true; 3904 } 3905 3906 ImplicitExceptionSpecification Spec(Context); 3907 bool Const; 3908 llvm::tie(Spec, Const) = 3909 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3910 3911 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3912 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3913 *ExceptionType = Context.getFunctionType( 3914 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3915 3916 // Check for parameter type matching. 3917 // This is a copy ctor so we know it's a cv-qualified reference to T. 3918 QualType ArgType = CtorType->getArgType(0); 3919 if (ArgType->getPointeeType().isVolatileQualified()) { 3920 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3921 HadError = true; 3922 } 3923 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3924 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3925 HadError = true; 3926 } 3927 3928 // C++11 [dcl.fct.def.default]p2: 3929 // An explicitly-defaulted function may be declared constexpr only if it 3930 // would have been implicitly declared as constexpr, 3931 // Do not apply this rule to templates, since core issue 1358 makes such 3932 // functions always instantiate to constexpr functions. 3933 if (CD->isConstexpr() && 3934 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 3935 if (!CD->getParent()->defaultedCopyConstructorIsConstexpr()) { 3936 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3937 << CXXCopyConstructor; 3938 HadError = true; 3939 } 3940 } 3941 // and may have an explicit exception-specification only if it is compatible 3942 // with the exception-specification on the implicit declaration. 3943 if (CtorType->hasExceptionSpec()) { 3944 if (CheckEquivalentExceptionSpec( 3945 PDiag(diag::err_incorrect_defaulted_exception_spec) 3946 << CXXCopyConstructor, 3947 PDiag(), 3948 ExceptionType, SourceLocation(), 3949 CtorType, CD->getLocation())) { 3950 HadError = true; 3951 } 3952 } 3953 3954 // If a function is explicitly defaulted on its first declaration, 3955 if (First) { 3956 // -- it is implicitly considered to be constexpr if the implicit 3957 // definition would be, 3958 CD->setConstexpr(CD->getParent()->defaultedCopyConstructorIsConstexpr()); 3959 3960 // -- it is implicitly considered to have the same 3961 // exception-specification as if it had been implicitly declared, and 3962 // 3963 // FIXME: a compatible, but different, explicit exception specification 3964 // will be silently overridden. We should issue a warning if this happens. 3965 EPI.ExtInfo = CtorType->getExtInfo(); 3966 3967 // -- [...] it shall have the same parameter type as if it had been 3968 // implicitly declared. 3969 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3970 } 3971 3972 if (HadError) { 3973 CD->setInvalidDecl(); 3974 return; 3975 } 3976 3977 if (ShouldDeleteSpecialMember(CD, CXXCopyConstructor)) { 3978 if (First) { 3979 CD->setDeletedAsWritten(); 3980 } else { 3981 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3982 << CXXCopyConstructor; 3983 CD->setInvalidDecl(); 3984 } 3985 } 3986} 3987 3988void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3989 assert(MD->isExplicitlyDefaulted()); 3990 3991 // Whether this was the first-declared instance of the operator 3992 bool First = MD == MD->getCanonicalDecl(); 3993 3994 bool HadError = false; 3995 if (MD->getNumParams() != 1) { 3996 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3997 << MD->getSourceRange(); 3998 HadError = true; 3999 } 4000 4001 QualType ReturnType = 4002 MD->getType()->getAs<FunctionType>()->getResultType(); 4003 if (!ReturnType->isLValueReferenceType() || 4004 !Context.hasSameType( 4005 Context.getCanonicalType(ReturnType->getPointeeType()), 4006 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 4007 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 4008 HadError = true; 4009 } 4010 4011 ImplicitExceptionSpecification Spec(Context); 4012 bool Const; 4013 llvm::tie(Spec, Const) = 4014 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 4015 4016 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4017 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4018 *ExceptionType = Context.getFunctionType( 4019 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4020 4021 QualType ArgType = OperType->getArgType(0); 4022 if (!ArgType->isLValueReferenceType()) { 4023 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4024 HadError = true; 4025 } else { 4026 if (ArgType->getPointeeType().isVolatileQualified()) { 4027 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 4028 HadError = true; 4029 } 4030 if (ArgType->getPointeeType().isConstQualified() && !Const) { 4031 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 4032 HadError = true; 4033 } 4034 } 4035 4036 if (OperType->getTypeQuals()) { 4037 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 4038 HadError = true; 4039 } 4040 4041 if (OperType->hasExceptionSpec()) { 4042 if (CheckEquivalentExceptionSpec( 4043 PDiag(diag::err_incorrect_defaulted_exception_spec) 4044 << CXXCopyAssignment, 4045 PDiag(), 4046 ExceptionType, SourceLocation(), 4047 OperType, MD->getLocation())) { 4048 HadError = true; 4049 } 4050 } 4051 if (First) { 4052 // We set the declaration to have the computed exception spec here. 4053 // We duplicate the one parameter type. 4054 EPI.RefQualifier = OperType->getRefQualifier(); 4055 EPI.ExtInfo = OperType->getExtInfo(); 4056 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4057 } 4058 4059 if (HadError) { 4060 MD->setInvalidDecl(); 4061 return; 4062 } 4063 4064 if (ShouldDeleteSpecialMember(MD, CXXCopyAssignment)) { 4065 if (First) { 4066 MD->setDeletedAsWritten(); 4067 } else { 4068 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4069 << CXXCopyAssignment; 4070 MD->setInvalidDecl(); 4071 } 4072 } 4073} 4074 4075void Sema::CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *CD) { 4076 assert(CD->isExplicitlyDefaulted() && CD->isMoveConstructor()); 4077 4078 // Whether this was the first-declared instance of the constructor. 4079 bool First = CD == CD->getCanonicalDecl(); 4080 4081 bool HadError = false; 4082 if (CD->getNumParams() != 1) { 4083 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_params) 4084 << CD->getSourceRange(); 4085 HadError = true; 4086 } 4087 4088 ImplicitExceptionSpecification Spec( 4089 ComputeDefaultedMoveCtorExceptionSpec(CD->getParent())); 4090 4091 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4092 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 4093 *ExceptionType = Context.getFunctionType( 4094 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4095 4096 // Check for parameter type matching. 4097 // This is a move ctor so we know it's a cv-qualified rvalue reference to T. 4098 QualType ArgType = CtorType->getArgType(0); 4099 if (ArgType->getPointeeType().isVolatileQualified()) { 4100 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_volatile_param); 4101 HadError = true; 4102 } 4103 if (ArgType->getPointeeType().isConstQualified()) { 4104 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_const_param); 4105 HadError = true; 4106 } 4107 4108 // C++11 [dcl.fct.def.default]p2: 4109 // An explicitly-defaulted function may be declared constexpr only if it 4110 // would have been implicitly declared as constexpr, 4111 // Do not apply this rule to templates, since core issue 1358 makes such 4112 // functions always instantiate to constexpr functions. 4113 if (CD->isConstexpr() && 4114 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4115 if (!CD->getParent()->defaultedMoveConstructorIsConstexpr()) { 4116 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 4117 << CXXMoveConstructor; 4118 HadError = true; 4119 } 4120 } 4121 // and may have an explicit exception-specification only if it is compatible 4122 // with the exception-specification on the implicit declaration. 4123 if (CtorType->hasExceptionSpec()) { 4124 if (CheckEquivalentExceptionSpec( 4125 PDiag(diag::err_incorrect_defaulted_exception_spec) 4126 << CXXMoveConstructor, 4127 PDiag(), 4128 ExceptionType, SourceLocation(), 4129 CtorType, CD->getLocation())) { 4130 HadError = true; 4131 } 4132 } 4133 4134 // If a function is explicitly defaulted on its first declaration, 4135 if (First) { 4136 // -- it is implicitly considered to be constexpr if the implicit 4137 // definition would be, 4138 CD->setConstexpr(CD->getParent()->defaultedMoveConstructorIsConstexpr()); 4139 4140 // -- it is implicitly considered to have the same 4141 // exception-specification as if it had been implicitly declared, and 4142 // 4143 // FIXME: a compatible, but different, explicit exception specification 4144 // will be silently overridden. We should issue a warning if this happens. 4145 EPI.ExtInfo = CtorType->getExtInfo(); 4146 4147 // -- [...] it shall have the same parameter type as if it had been 4148 // implicitly declared. 4149 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 4150 } 4151 4152 if (HadError) { 4153 CD->setInvalidDecl(); 4154 return; 4155 } 4156 4157 if (ShouldDeleteSpecialMember(CD, CXXMoveConstructor)) { 4158 if (First) { 4159 CD->setDeletedAsWritten(); 4160 } else { 4161 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 4162 << CXXMoveConstructor; 4163 CD->setInvalidDecl(); 4164 } 4165 } 4166} 4167 4168void Sema::CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *MD) { 4169 assert(MD->isExplicitlyDefaulted()); 4170 4171 // Whether this was the first-declared instance of the operator 4172 bool First = MD == MD->getCanonicalDecl(); 4173 4174 bool HadError = false; 4175 if (MD->getNumParams() != 1) { 4176 Diag(MD->getLocation(), diag::err_defaulted_move_assign_params) 4177 << MD->getSourceRange(); 4178 HadError = true; 4179 } 4180 4181 QualType ReturnType = 4182 MD->getType()->getAs<FunctionType>()->getResultType(); 4183 if (!ReturnType->isLValueReferenceType() || 4184 !Context.hasSameType( 4185 Context.getCanonicalType(ReturnType->getPointeeType()), 4186 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 4187 Diag(MD->getLocation(), diag::err_defaulted_move_assign_return_type); 4188 HadError = true; 4189 } 4190 4191 ImplicitExceptionSpecification Spec( 4192 ComputeDefaultedMoveCtorExceptionSpec(MD->getParent())); 4193 4194 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4195 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4196 *ExceptionType = Context.getFunctionType( 4197 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4198 4199 QualType ArgType = OperType->getArgType(0); 4200 if (!ArgType->isRValueReferenceType()) { 4201 Diag(MD->getLocation(), diag::err_defaulted_move_assign_not_ref); 4202 HadError = true; 4203 } else { 4204 if (ArgType->getPointeeType().isVolatileQualified()) { 4205 Diag(MD->getLocation(), diag::err_defaulted_move_assign_volatile_param); 4206 HadError = true; 4207 } 4208 if (ArgType->getPointeeType().isConstQualified()) { 4209 Diag(MD->getLocation(), diag::err_defaulted_move_assign_const_param); 4210 HadError = true; 4211 } 4212 } 4213 4214 if (OperType->getTypeQuals()) { 4215 Diag(MD->getLocation(), diag::err_defaulted_move_assign_quals); 4216 HadError = true; 4217 } 4218 4219 if (OperType->hasExceptionSpec()) { 4220 if (CheckEquivalentExceptionSpec( 4221 PDiag(diag::err_incorrect_defaulted_exception_spec) 4222 << CXXMoveAssignment, 4223 PDiag(), 4224 ExceptionType, SourceLocation(), 4225 OperType, MD->getLocation())) { 4226 HadError = true; 4227 } 4228 } 4229 if (First) { 4230 // We set the declaration to have the computed exception spec here. 4231 // We duplicate the one parameter type. 4232 EPI.RefQualifier = OperType->getRefQualifier(); 4233 EPI.ExtInfo = OperType->getExtInfo(); 4234 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4235 } 4236 4237 if (HadError) { 4238 MD->setInvalidDecl(); 4239 return; 4240 } 4241 4242 if (ShouldDeleteSpecialMember(MD, CXXMoveAssignment)) { 4243 if (First) { 4244 MD->setDeletedAsWritten(); 4245 } else { 4246 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4247 << CXXMoveAssignment; 4248 MD->setInvalidDecl(); 4249 } 4250 } 4251} 4252 4253void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 4254 assert(DD->isExplicitlyDefaulted()); 4255 4256 // Whether this was the first-declared instance of the destructor. 4257 bool First = DD == DD->getCanonicalDecl(); 4258 4259 ImplicitExceptionSpecification Spec 4260 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 4261 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4262 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 4263 *ExceptionType = Context.getFunctionType( 4264 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4265 4266 if (DtorType->hasExceptionSpec()) { 4267 if (CheckEquivalentExceptionSpec( 4268 PDiag(diag::err_incorrect_defaulted_exception_spec) 4269 << CXXDestructor, 4270 PDiag(), 4271 ExceptionType, SourceLocation(), 4272 DtorType, DD->getLocation())) { 4273 DD->setInvalidDecl(); 4274 return; 4275 } 4276 } 4277 if (First) { 4278 // We set the declaration to have the computed exception spec here. 4279 // There are no parameters. 4280 EPI.ExtInfo = DtorType->getExtInfo(); 4281 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 4282 } 4283 4284 if (ShouldDeleteSpecialMember(DD, CXXDestructor)) { 4285 if (First) { 4286 DD->setDeletedAsWritten(); 4287 } else { 4288 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 4289 << CXXDestructor; 4290 DD->setInvalidDecl(); 4291 } 4292 } 4293} 4294 4295namespace { 4296struct SpecialMemberDeletionInfo { 4297 Sema &S; 4298 CXXMethodDecl *MD; 4299 Sema::CXXSpecialMember CSM; 4300 4301 // Properties of the special member, computed for convenience. 4302 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4303 SourceLocation Loc; 4304 4305 bool AllFieldsAreConst; 4306 4307 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4308 Sema::CXXSpecialMember CSM) 4309 : S(S), MD(MD), CSM(CSM), 4310 IsConstructor(false), IsAssignment(false), IsMove(false), 4311 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4312 AllFieldsAreConst(true) { 4313 switch (CSM) { 4314 case Sema::CXXDefaultConstructor: 4315 case Sema::CXXCopyConstructor: 4316 IsConstructor = true; 4317 break; 4318 case Sema::CXXMoveConstructor: 4319 IsConstructor = true; 4320 IsMove = true; 4321 break; 4322 case Sema::CXXCopyAssignment: 4323 IsAssignment = true; 4324 break; 4325 case Sema::CXXMoveAssignment: 4326 IsAssignment = true; 4327 IsMove = true; 4328 break; 4329 case Sema::CXXDestructor: 4330 break; 4331 case Sema::CXXInvalid: 4332 llvm_unreachable("invalid special member kind"); 4333 } 4334 4335 if (MD->getNumParams()) { 4336 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4337 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4338 } 4339 } 4340 4341 bool inUnion() const { return MD->getParent()->isUnion(); } 4342 4343 /// Look up the corresponding special member in the given class. 4344 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class) { 4345 unsigned TQ = MD->getTypeQualifiers(); 4346 return S.LookupSpecialMember(Class, CSM, ConstArg, VolatileArg, 4347 MD->getRefQualifier() == RQ_RValue, 4348 TQ & Qualifiers::Const, 4349 TQ & Qualifiers::Volatile); 4350 } 4351 4352 bool shouldDeleteForBase(CXXRecordDecl *BaseDecl, bool IsVirtualBase); 4353 bool shouldDeleteForField(FieldDecl *FD); 4354 bool shouldDeleteForAllConstMembers(); 4355}; 4356} 4357 4358/// Check whether we should delete a special member function due to the class 4359/// having a particular direct or virtual base class. 4360bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXRecordDecl *BaseDecl, 4361 bool IsVirtualBase) { 4362 // C++11 [class.copy]p23: 4363 // -- for the move assignment operator, any direct or indirect virtual 4364 // base class. 4365 if (CSM == Sema::CXXMoveAssignment && IsVirtualBase) 4366 return true; 4367 4368 // C++11 [class.ctor]p5, C++11 [class.copy]p11, C++11 [class.dtor]p5: 4369 // -- any direct or virtual base class [...] has a type with a destructor 4370 // that is deleted or inaccessible 4371 if (!IsAssignment) { 4372 CXXDestructorDecl *BaseDtor = S.LookupDestructor(BaseDecl); 4373 if (BaseDtor->isDeleted()) 4374 return true; 4375 if (S.CheckDestructorAccess(Loc, BaseDtor, S.PDiag()) 4376 != Sema::AR_accessible) 4377 return true; 4378 } 4379 4380 // C++11 [class.ctor]p5: 4381 // -- any direct or virtual base class [...] has class type M [...] and 4382 // either M has no default constructor or overload resolution as applied 4383 // to M's default constructor results in an ambiguity or in a function 4384 // that is deleted or inaccessible 4385 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4386 // -- a direct or virtual base class B that cannot be copied/moved because 4387 // overload resolution, as applied to B's corresponding special member, 4388 // results in an ambiguity or a function that is deleted or inaccessible 4389 // from the defaulted special member 4390 if (CSM != Sema::CXXDestructor) { 4391 Sema::SpecialMemberOverloadResult *SMOR = lookupIn(BaseDecl); 4392 if (!SMOR->hasSuccess()) 4393 return true; 4394 4395 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4396 if (IsConstructor) { 4397 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4398 if (S.CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4399 S.PDiag()) != Sema::AR_accessible) 4400 return true; 4401 4402 // -- for the move constructor, a [...] direct or virtual base class with 4403 // a type that does not have a move constructor and is not trivially 4404 // copyable. 4405 if (IsMove && !BaseCtor->isMoveConstructor() && 4406 !BaseDecl->isTriviallyCopyable()) 4407 return true; 4408 } else { 4409 assert(IsAssignment && "unexpected kind of special member"); 4410 if (S.CheckDirectMemberAccess(Loc, BaseMember, S.PDiag()) 4411 != Sema::AR_accessible) 4412 return true; 4413 4414 // -- for the move assignment operator, a direct base class with a type 4415 // that does not have a move assignment operator and is not trivially 4416 // copyable. 4417 if (IsMove && !BaseMember->isMoveAssignmentOperator() && 4418 !BaseDecl->isTriviallyCopyable()) 4419 return true; 4420 } 4421 } 4422 4423 // C++11 [class.dtor]p5: 4424 // -- for a virtual destructor, lookup of the non-array deallocation function 4425 // results in an ambiguity or in a function that is deleted or inaccessible 4426 if (CSM == Sema::CXXDestructor && MD->isVirtual()) { 4427 FunctionDecl *OperatorDelete = 0; 4428 DeclarationName Name = 4429 S.Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4430 if (S.FindDeallocationFunction(Loc, MD->getParent(), Name, 4431 OperatorDelete, false)) 4432 return true; 4433 } 4434 4435 return false; 4436} 4437 4438/// Check whether we should delete a special member function due to the class 4439/// having a particular non-static data member. 4440bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4441 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4442 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4443 4444 if (CSM == Sema::CXXDefaultConstructor) { 4445 // For a default constructor, all references must be initialized in-class 4446 // and, if a union, it must have a non-const member. 4447 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) 4448 return true; 4449 4450 if (inUnion() && !FieldType.isConstQualified()) 4451 AllFieldsAreConst = false; 4452 } else if (CSM == Sema::CXXCopyConstructor) { 4453 // For a copy constructor, data members must not be of rvalue reference 4454 // type. 4455 if (FieldType->isRValueReferenceType()) 4456 return true; 4457 } else if (IsAssignment) { 4458 // For an assignment operator, data members must not be of reference type. 4459 if (FieldType->isReferenceType()) 4460 return true; 4461 } 4462 4463 if (FieldRecord) { 4464 // For a default constructor, a const member must have a user-provided 4465 // default constructor or else be explicitly initialized. 4466 if (CSM == Sema::CXXDefaultConstructor && FieldType.isConstQualified() && 4467 !FD->hasInClassInitializer() && 4468 !FieldRecord->hasUserProvidedDefaultConstructor()) 4469 return true; 4470 4471 // Some additional restrictions exist on the variant members. 4472 if (!inUnion() && FieldRecord->isUnion() && 4473 FieldRecord->isAnonymousStructOrUnion()) { 4474 bool AllVariantFieldsAreConst = true; 4475 4476 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4477 UE = FieldRecord->field_end(); 4478 UI != UE; ++UI) { 4479 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4480 CXXRecordDecl *UnionFieldRecord = 4481 UnionFieldType->getAsCXXRecordDecl(); 4482 4483 if (!UnionFieldType.isConstQualified()) 4484 AllVariantFieldsAreConst = false; 4485 4486 if (UnionFieldRecord) { 4487 // FIXME: Checking for accessibility and validity of this 4488 // destructor is technically going beyond the 4489 // standard, but this is believed to be a defect. 4490 if (!IsAssignment) { 4491 CXXDestructorDecl *FieldDtor = S.LookupDestructor(UnionFieldRecord); 4492 if (FieldDtor->isDeleted()) 4493 return true; 4494 if (S.CheckDestructorAccess(Loc, FieldDtor, S.PDiag()) != 4495 Sema::AR_accessible) 4496 return true; 4497 if (!FieldDtor->isTrivial()) 4498 return true; 4499 } 4500 4501 // FIXME: in-class initializers should be handled here 4502 if (CSM != Sema::CXXDestructor) { 4503 Sema::SpecialMemberOverloadResult *SMOR = 4504 lookupIn(UnionFieldRecord); 4505 // FIXME: Checking for accessibility and validity of this 4506 // corresponding member is technically going beyond the 4507 // standard, but this is believed to be a defect. 4508 if (!SMOR->hasSuccess()) 4509 return true; 4510 4511 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4512 // A member of a union must have a trivial corresponding 4513 // special member. 4514 if (!FieldMember->isTrivial()) 4515 return true; 4516 4517 if (IsConstructor) { 4518 CXXConstructorDecl *FieldCtor = 4519 cast<CXXConstructorDecl>(FieldMember); 4520 if (S.CheckConstructorAccess(Loc, FieldCtor, 4521 FieldCtor->getAccess(), 4522 S.PDiag()) != Sema::AR_accessible) 4523 return true; 4524 } else { 4525 assert(IsAssignment && "unexpected kind of special member"); 4526 if (S.CheckDirectMemberAccess(Loc, FieldMember, S.PDiag()) 4527 != Sema::AR_accessible) 4528 return true; 4529 } 4530 } 4531 } 4532 } 4533 4534 // At least one member in each anonymous union must be non-const 4535 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst) 4536 return true; 4537 4538 // Don't try to initialize the anonymous union 4539 // This is technically non-conformant, but sanity demands it. 4540 return false; 4541 } 4542 4543 // Unless we're doing assignment, the field's destructor must be 4544 // accessible and not deleted. 4545 if (!IsAssignment) { 4546 CXXDestructorDecl *FieldDtor = S.LookupDestructor(FieldRecord); 4547 if (FieldDtor->isDeleted()) 4548 return true; 4549 if (S.CheckDestructorAccess(Loc, FieldDtor, S.PDiag()) != 4550 Sema::AR_accessible) 4551 return true; 4552 } 4553 4554 // Check that the corresponding member of the field is accessible, 4555 // unique, and non-deleted. We don't do this if it has an explicit 4556 // initialization when default-constructing. 4557 if (CSM != Sema::CXXDestructor && 4558 !(CSM == Sema::CXXDefaultConstructor && FD->hasInClassInitializer())) { 4559 Sema::SpecialMemberOverloadResult *SMOR = lookupIn(FieldRecord); 4560 if (!SMOR->hasSuccess()) 4561 return true; 4562 4563 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4564 if (IsConstructor) { 4565 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4566 if (S.CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4567 S.PDiag()) != Sema::AR_accessible) 4568 return true; 4569 4570 // For a move operation, the corresponding operation must actually 4571 // be a move operation (and not a copy selected by overload 4572 // resolution) unless we are working on a trivially copyable class. 4573 if (IsMove && !FieldCtor->isMoveConstructor() && 4574 !FieldRecord->isTriviallyCopyable()) 4575 return true; 4576 } else { 4577 assert(IsAssignment && "unexpected kind of special member"); 4578 if (S.CheckDirectMemberAccess(Loc, FieldMember, S.PDiag()) 4579 != Sema::AR_accessible) 4580 return true; 4581 4582 // -- for the move assignment operator, a non-static data member with a 4583 // type that does not have a move assignment operator and is not 4584 // trivially copyable. 4585 if (IsMove && !FieldMember->isMoveAssignmentOperator() && 4586 !FieldRecord->isTriviallyCopyable()) 4587 return true; 4588 } 4589 4590 // We need the corresponding member of a union to be trivial so that 4591 // we can safely copy them all simultaneously. 4592 // FIXME: Note that performing the check here (where we rely on the lack 4593 // of an in-class initializer) is technically ill-formed. However, this 4594 // seems most obviously to be a bug in the standard. 4595 if (inUnion() && !FieldMember->isTrivial()) 4596 return true; 4597 } 4598 } else if (CSM == Sema::CXXDefaultConstructor && !inUnion() && 4599 FieldType.isConstQualified() && !FD->hasInClassInitializer()) { 4600 // We can't initialize a const member of non-class type to any value. 4601 return true; 4602 } else if (IsAssignment && FieldType.isConstQualified()) { 4603 // C++11 [class.copy]p23: 4604 // -- a non-static data member of const non-class type (or array thereof) 4605 return true; 4606 } 4607 4608 return false; 4609} 4610 4611/// C++11 [class.ctor] p5: 4612/// A defaulted default constructor for a class X is defined as deleted if 4613/// X is a union and all of its variant members are of const-qualified type. 4614bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4615 return CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst; 4616} 4617 4618/// Determine whether a defaulted special member function should be defined as 4619/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4620/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4621bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM) { 4622 assert(!MD->isInvalidDecl()); 4623 CXXRecordDecl *RD = MD->getParent(); 4624 assert(!RD->isDependentType() && "do deletion after instantiation"); 4625 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4626 return false; 4627 4628 // C++11 [expr.lambda.prim]p19: 4629 // The closure type associated with a lambda-expression has a 4630 // deleted (8.4.3) default constructor and a deleted copy 4631 // assignment operator. 4632 if (RD->isLambda() && 4633 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) 4634 return true; 4635 4636 // For an anonymous struct or union, the copy and assignment special members 4637 // will never be used, so skip the check. For an anonymous union declared at 4638 // namespace scope, the constructor and destructor are used. 4639 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4640 RD->isAnonymousStructOrUnion()) 4641 return false; 4642 4643 // Do access control from the special member function 4644 ContextRAII MethodContext(*this, MD); 4645 4646 SpecialMemberDeletionInfo SMI(*this, MD, CSM); 4647 4648 // FIXME: We should put some diagnostic logic right into this function. 4649 4650 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4651 BE = RD->bases_end(); BI != BE; ++BI) 4652 if (!BI->isVirtual() && 4653 SMI.shouldDeleteForBase(BI->getType()->getAsCXXRecordDecl(), false)) 4654 return true; 4655 4656 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4657 BE = RD->vbases_end(); BI != BE; ++BI) 4658 if (SMI.shouldDeleteForBase(BI->getType()->getAsCXXRecordDecl(), true)) 4659 return true; 4660 4661 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4662 FE = RD->field_end(); FI != FE; ++FI) 4663 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 4664 SMI.shouldDeleteForField(*FI)) 4665 return true; 4666 4667 if (SMI.shouldDeleteForAllConstMembers()) 4668 return true; 4669 4670 return false; 4671} 4672 4673/// \brief Data used with FindHiddenVirtualMethod 4674namespace { 4675 struct FindHiddenVirtualMethodData { 4676 Sema *S; 4677 CXXMethodDecl *Method; 4678 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4679 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4680 }; 4681} 4682 4683/// \brief Member lookup function that determines whether a given C++ 4684/// method overloads virtual methods in a base class without overriding any, 4685/// to be used with CXXRecordDecl::lookupInBases(). 4686static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4687 CXXBasePath &Path, 4688 void *UserData) { 4689 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4690 4691 FindHiddenVirtualMethodData &Data 4692 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4693 4694 DeclarationName Name = Data.Method->getDeclName(); 4695 assert(Name.getNameKind() == DeclarationName::Identifier); 4696 4697 bool foundSameNameMethod = false; 4698 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4699 for (Path.Decls = BaseRecord->lookup(Name); 4700 Path.Decls.first != Path.Decls.second; 4701 ++Path.Decls.first) { 4702 NamedDecl *D = *Path.Decls.first; 4703 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4704 MD = MD->getCanonicalDecl(); 4705 foundSameNameMethod = true; 4706 // Interested only in hidden virtual methods. 4707 if (!MD->isVirtual()) 4708 continue; 4709 // If the method we are checking overrides a method from its base 4710 // don't warn about the other overloaded methods. 4711 if (!Data.S->IsOverload(Data.Method, MD, false)) 4712 return true; 4713 // Collect the overload only if its hidden. 4714 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4715 overloadedMethods.push_back(MD); 4716 } 4717 } 4718 4719 if (foundSameNameMethod) 4720 Data.OverloadedMethods.append(overloadedMethods.begin(), 4721 overloadedMethods.end()); 4722 return foundSameNameMethod; 4723} 4724 4725/// \brief See if a method overloads virtual methods in a base class without 4726/// overriding any. 4727void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4728 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4729 MD->getLocation()) == DiagnosticsEngine::Ignored) 4730 return; 4731 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4732 return; 4733 4734 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4735 /*bool RecordPaths=*/false, 4736 /*bool DetectVirtual=*/false); 4737 FindHiddenVirtualMethodData Data; 4738 Data.Method = MD; 4739 Data.S = this; 4740 4741 // Keep the base methods that were overriden or introduced in the subclass 4742 // by 'using' in a set. A base method not in this set is hidden. 4743 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4744 res.first != res.second; ++res.first) { 4745 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4746 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4747 E = MD->end_overridden_methods(); 4748 I != E; ++I) 4749 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4750 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4751 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4752 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4753 } 4754 4755 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4756 !Data.OverloadedMethods.empty()) { 4757 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4758 << MD << (Data.OverloadedMethods.size() > 1); 4759 4760 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4761 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4762 Diag(overloadedMD->getLocation(), 4763 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4764 } 4765 } 4766} 4767 4768void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4769 Decl *TagDecl, 4770 SourceLocation LBrac, 4771 SourceLocation RBrac, 4772 AttributeList *AttrList) { 4773 if (!TagDecl) 4774 return; 4775 4776 AdjustDeclIfTemplate(TagDecl); 4777 4778 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4779 // strict aliasing violation! 4780 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4781 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4782 4783 CheckCompletedCXXClass( 4784 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4785} 4786 4787/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4788/// special functions, such as the default constructor, copy 4789/// constructor, or destructor, to the given C++ class (C++ 4790/// [special]p1). This routine can only be executed just before the 4791/// definition of the class is complete. 4792void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4793 if (!ClassDecl->hasUserDeclaredConstructor()) 4794 ++ASTContext::NumImplicitDefaultConstructors; 4795 4796 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4797 ++ASTContext::NumImplicitCopyConstructors; 4798 4799 if (getLangOptions().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 4800 ++ASTContext::NumImplicitMoveConstructors; 4801 4802 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4803 ++ASTContext::NumImplicitCopyAssignmentOperators; 4804 4805 // If we have a dynamic class, then the copy assignment operator may be 4806 // virtual, so we have to declare it immediately. This ensures that, e.g., 4807 // it shows up in the right place in the vtable and that we diagnose 4808 // problems with the implicit exception specification. 4809 if (ClassDecl->isDynamicClass()) 4810 DeclareImplicitCopyAssignment(ClassDecl); 4811 } 4812 4813 if (getLangOptions().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()){ 4814 ++ASTContext::NumImplicitMoveAssignmentOperators; 4815 4816 // Likewise for the move assignment operator. 4817 if (ClassDecl->isDynamicClass()) 4818 DeclareImplicitMoveAssignment(ClassDecl); 4819 } 4820 4821 if (!ClassDecl->hasUserDeclaredDestructor()) { 4822 ++ASTContext::NumImplicitDestructors; 4823 4824 // If we have a dynamic class, then the destructor may be virtual, so we 4825 // have to declare the destructor immediately. This ensures that, e.g., it 4826 // shows up in the right place in the vtable and that we diagnose problems 4827 // with the implicit exception specification. 4828 if (ClassDecl->isDynamicClass()) 4829 DeclareImplicitDestructor(ClassDecl); 4830 } 4831} 4832 4833void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4834 if (!D) 4835 return; 4836 4837 int NumParamList = D->getNumTemplateParameterLists(); 4838 for (int i = 0; i < NumParamList; i++) { 4839 TemplateParameterList* Params = D->getTemplateParameterList(i); 4840 for (TemplateParameterList::iterator Param = Params->begin(), 4841 ParamEnd = Params->end(); 4842 Param != ParamEnd; ++Param) { 4843 NamedDecl *Named = cast<NamedDecl>(*Param); 4844 if (Named->getDeclName()) { 4845 S->AddDecl(Named); 4846 IdResolver.AddDecl(Named); 4847 } 4848 } 4849 } 4850} 4851 4852void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4853 if (!D) 4854 return; 4855 4856 TemplateParameterList *Params = 0; 4857 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4858 Params = Template->getTemplateParameters(); 4859 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4860 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4861 Params = PartialSpec->getTemplateParameters(); 4862 else 4863 return; 4864 4865 for (TemplateParameterList::iterator Param = Params->begin(), 4866 ParamEnd = Params->end(); 4867 Param != ParamEnd; ++Param) { 4868 NamedDecl *Named = cast<NamedDecl>(*Param); 4869 if (Named->getDeclName()) { 4870 S->AddDecl(Named); 4871 IdResolver.AddDecl(Named); 4872 } 4873 } 4874} 4875 4876void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4877 if (!RecordD) return; 4878 AdjustDeclIfTemplate(RecordD); 4879 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4880 PushDeclContext(S, Record); 4881} 4882 4883void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4884 if (!RecordD) return; 4885 PopDeclContext(); 4886} 4887 4888/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4889/// parsing a top-level (non-nested) C++ class, and we are now 4890/// parsing those parts of the given Method declaration that could 4891/// not be parsed earlier (C++ [class.mem]p2), such as default 4892/// arguments. This action should enter the scope of the given 4893/// Method declaration as if we had just parsed the qualified method 4894/// name. However, it should not bring the parameters into scope; 4895/// that will be performed by ActOnDelayedCXXMethodParameter. 4896void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4897} 4898 4899/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4900/// C++ method declaration. We're (re-)introducing the given 4901/// function parameter into scope for use in parsing later parts of 4902/// the method declaration. For example, we could see an 4903/// ActOnParamDefaultArgument event for this parameter. 4904void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4905 if (!ParamD) 4906 return; 4907 4908 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4909 4910 // If this parameter has an unparsed default argument, clear it out 4911 // to make way for the parsed default argument. 4912 if (Param->hasUnparsedDefaultArg()) 4913 Param->setDefaultArg(0); 4914 4915 S->AddDecl(Param); 4916 if (Param->getDeclName()) 4917 IdResolver.AddDecl(Param); 4918} 4919 4920/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4921/// processing the delayed method declaration for Method. The method 4922/// declaration is now considered finished. There may be a separate 4923/// ActOnStartOfFunctionDef action later (not necessarily 4924/// immediately!) for this method, if it was also defined inside the 4925/// class body. 4926void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4927 if (!MethodD) 4928 return; 4929 4930 AdjustDeclIfTemplate(MethodD); 4931 4932 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4933 4934 // Now that we have our default arguments, check the constructor 4935 // again. It could produce additional diagnostics or affect whether 4936 // the class has implicitly-declared destructors, among other 4937 // things. 4938 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4939 CheckConstructor(Constructor); 4940 4941 // Check the default arguments, which we may have added. 4942 if (!Method->isInvalidDecl()) 4943 CheckCXXDefaultArguments(Method); 4944} 4945 4946/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4947/// the well-formedness of the constructor declarator @p D with type @p 4948/// R. If there are any errors in the declarator, this routine will 4949/// emit diagnostics and set the invalid bit to true. In any case, the type 4950/// will be updated to reflect a well-formed type for the constructor and 4951/// returned. 4952QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4953 StorageClass &SC) { 4954 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4955 4956 // C++ [class.ctor]p3: 4957 // A constructor shall not be virtual (10.3) or static (9.4). A 4958 // constructor can be invoked for a const, volatile or const 4959 // volatile object. A constructor shall not be declared const, 4960 // volatile, or const volatile (9.3.2). 4961 if (isVirtual) { 4962 if (!D.isInvalidType()) 4963 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4964 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4965 << SourceRange(D.getIdentifierLoc()); 4966 D.setInvalidType(); 4967 } 4968 if (SC == SC_Static) { 4969 if (!D.isInvalidType()) 4970 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4971 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4972 << SourceRange(D.getIdentifierLoc()); 4973 D.setInvalidType(); 4974 SC = SC_None; 4975 } 4976 4977 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4978 if (FTI.TypeQuals != 0) { 4979 if (FTI.TypeQuals & Qualifiers::Const) 4980 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4981 << "const" << SourceRange(D.getIdentifierLoc()); 4982 if (FTI.TypeQuals & Qualifiers::Volatile) 4983 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4984 << "volatile" << SourceRange(D.getIdentifierLoc()); 4985 if (FTI.TypeQuals & Qualifiers::Restrict) 4986 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4987 << "restrict" << SourceRange(D.getIdentifierLoc()); 4988 D.setInvalidType(); 4989 } 4990 4991 // C++0x [class.ctor]p4: 4992 // A constructor shall not be declared with a ref-qualifier. 4993 if (FTI.hasRefQualifier()) { 4994 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 4995 << FTI.RefQualifierIsLValueRef 4996 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4997 D.setInvalidType(); 4998 } 4999 5000 // Rebuild the function type "R" without any type qualifiers (in 5001 // case any of the errors above fired) and with "void" as the 5002 // return type, since constructors don't have return types. 5003 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5004 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5005 return R; 5006 5007 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5008 EPI.TypeQuals = 0; 5009 EPI.RefQualifier = RQ_None; 5010 5011 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5012 Proto->getNumArgs(), EPI); 5013} 5014 5015/// CheckConstructor - Checks a fully-formed constructor for 5016/// well-formedness, issuing any diagnostics required. Returns true if 5017/// the constructor declarator is invalid. 5018void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5019 CXXRecordDecl *ClassDecl 5020 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5021 if (!ClassDecl) 5022 return Constructor->setInvalidDecl(); 5023 5024 // C++ [class.copy]p3: 5025 // A declaration of a constructor for a class X is ill-formed if 5026 // its first parameter is of type (optionally cv-qualified) X and 5027 // either there are no other parameters or else all other 5028 // parameters have default arguments. 5029 if (!Constructor->isInvalidDecl() && 5030 ((Constructor->getNumParams() == 1) || 5031 (Constructor->getNumParams() > 1 && 5032 Constructor->getParamDecl(1)->hasDefaultArg())) && 5033 Constructor->getTemplateSpecializationKind() 5034 != TSK_ImplicitInstantiation) { 5035 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5036 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5037 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5038 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5039 const char *ConstRef 5040 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5041 : " const &"; 5042 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5043 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5044 5045 // FIXME: Rather that making the constructor invalid, we should endeavor 5046 // to fix the type. 5047 Constructor->setInvalidDecl(); 5048 } 5049 } 5050} 5051 5052/// CheckDestructor - Checks a fully-formed destructor definition for 5053/// well-formedness, issuing any diagnostics required. Returns true 5054/// on error. 5055bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5056 CXXRecordDecl *RD = Destructor->getParent(); 5057 5058 if (Destructor->isVirtual()) { 5059 SourceLocation Loc; 5060 5061 if (!Destructor->isImplicit()) 5062 Loc = Destructor->getLocation(); 5063 else 5064 Loc = RD->getLocation(); 5065 5066 // If we have a virtual destructor, look up the deallocation function 5067 FunctionDecl *OperatorDelete = 0; 5068 DeclarationName Name = 5069 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5070 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5071 return true; 5072 5073 MarkFunctionReferenced(Loc, OperatorDelete); 5074 5075 Destructor->setOperatorDelete(OperatorDelete); 5076 } 5077 5078 return false; 5079} 5080 5081static inline bool 5082FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5083 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5084 FTI.ArgInfo[0].Param && 5085 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5086} 5087 5088/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5089/// the well-formednes of the destructor declarator @p D with type @p 5090/// R. If there are any errors in the declarator, this routine will 5091/// emit diagnostics and set the declarator to invalid. Even if this happens, 5092/// will be updated to reflect a well-formed type for the destructor and 5093/// returned. 5094QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5095 StorageClass& SC) { 5096 // C++ [class.dtor]p1: 5097 // [...] A typedef-name that names a class is a class-name 5098 // (7.1.3); however, a typedef-name that names a class shall not 5099 // be used as the identifier in the declarator for a destructor 5100 // declaration. 5101 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5102 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5103 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5104 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5105 else if (const TemplateSpecializationType *TST = 5106 DeclaratorType->getAs<TemplateSpecializationType>()) 5107 if (TST->isTypeAlias()) 5108 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5109 << DeclaratorType << 1; 5110 5111 // C++ [class.dtor]p2: 5112 // A destructor is used to destroy objects of its class type. A 5113 // destructor takes no parameters, and no return type can be 5114 // specified for it (not even void). The address of a destructor 5115 // shall not be taken. A destructor shall not be static. A 5116 // destructor can be invoked for a const, volatile or const 5117 // volatile object. A destructor shall not be declared const, 5118 // volatile or const volatile (9.3.2). 5119 if (SC == SC_Static) { 5120 if (!D.isInvalidType()) 5121 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5122 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5123 << SourceRange(D.getIdentifierLoc()) 5124 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5125 5126 SC = SC_None; 5127 } 5128 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5129 // Destructors don't have return types, but the parser will 5130 // happily parse something like: 5131 // 5132 // class X { 5133 // float ~X(); 5134 // }; 5135 // 5136 // The return type will be eliminated later. 5137 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5138 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5139 << SourceRange(D.getIdentifierLoc()); 5140 } 5141 5142 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5143 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5144 if (FTI.TypeQuals & Qualifiers::Const) 5145 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5146 << "const" << SourceRange(D.getIdentifierLoc()); 5147 if (FTI.TypeQuals & Qualifiers::Volatile) 5148 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5149 << "volatile" << SourceRange(D.getIdentifierLoc()); 5150 if (FTI.TypeQuals & Qualifiers::Restrict) 5151 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5152 << "restrict" << SourceRange(D.getIdentifierLoc()); 5153 D.setInvalidType(); 5154 } 5155 5156 // C++0x [class.dtor]p2: 5157 // A destructor shall not be declared with a ref-qualifier. 5158 if (FTI.hasRefQualifier()) { 5159 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5160 << FTI.RefQualifierIsLValueRef 5161 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5162 D.setInvalidType(); 5163 } 5164 5165 // Make sure we don't have any parameters. 5166 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5167 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5168 5169 // Delete the parameters. 5170 FTI.freeArgs(); 5171 D.setInvalidType(); 5172 } 5173 5174 // Make sure the destructor isn't variadic. 5175 if (FTI.isVariadic) { 5176 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5177 D.setInvalidType(); 5178 } 5179 5180 // Rebuild the function type "R" without any type qualifiers or 5181 // parameters (in case any of the errors above fired) and with 5182 // "void" as the return type, since destructors don't have return 5183 // types. 5184 if (!D.isInvalidType()) 5185 return R; 5186 5187 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5188 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5189 EPI.Variadic = false; 5190 EPI.TypeQuals = 0; 5191 EPI.RefQualifier = RQ_None; 5192 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5193} 5194 5195/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5196/// well-formednes of the conversion function declarator @p D with 5197/// type @p R. If there are any errors in the declarator, this routine 5198/// will emit diagnostics and return true. Otherwise, it will return 5199/// false. Either way, the type @p R will be updated to reflect a 5200/// well-formed type for the conversion operator. 5201void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5202 StorageClass& SC) { 5203 // C++ [class.conv.fct]p1: 5204 // Neither parameter types nor return type can be specified. The 5205 // type of a conversion function (8.3.5) is "function taking no 5206 // parameter returning conversion-type-id." 5207 if (SC == SC_Static) { 5208 if (!D.isInvalidType()) 5209 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5210 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5211 << SourceRange(D.getIdentifierLoc()); 5212 D.setInvalidType(); 5213 SC = SC_None; 5214 } 5215 5216 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5217 5218 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5219 // Conversion functions don't have return types, but the parser will 5220 // happily parse something like: 5221 // 5222 // class X { 5223 // float operator bool(); 5224 // }; 5225 // 5226 // The return type will be changed later anyway. 5227 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5228 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5229 << SourceRange(D.getIdentifierLoc()); 5230 D.setInvalidType(); 5231 } 5232 5233 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5234 5235 // Make sure we don't have any parameters. 5236 if (Proto->getNumArgs() > 0) { 5237 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5238 5239 // Delete the parameters. 5240 D.getFunctionTypeInfo().freeArgs(); 5241 D.setInvalidType(); 5242 } else if (Proto->isVariadic()) { 5243 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5244 D.setInvalidType(); 5245 } 5246 5247 // Diagnose "&operator bool()" and other such nonsense. This 5248 // is actually a gcc extension which we don't support. 5249 if (Proto->getResultType() != ConvType) { 5250 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5251 << Proto->getResultType(); 5252 D.setInvalidType(); 5253 ConvType = Proto->getResultType(); 5254 } 5255 5256 // C++ [class.conv.fct]p4: 5257 // The conversion-type-id shall not represent a function type nor 5258 // an array type. 5259 if (ConvType->isArrayType()) { 5260 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5261 ConvType = Context.getPointerType(ConvType); 5262 D.setInvalidType(); 5263 } else if (ConvType->isFunctionType()) { 5264 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5265 ConvType = Context.getPointerType(ConvType); 5266 D.setInvalidType(); 5267 } 5268 5269 // Rebuild the function type "R" without any parameters (in case any 5270 // of the errors above fired) and with the conversion type as the 5271 // return type. 5272 if (D.isInvalidType()) 5273 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5274 5275 // C++0x explicit conversion operators. 5276 if (D.getDeclSpec().isExplicitSpecified()) 5277 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5278 getLangOptions().CPlusPlus0x ? 5279 diag::warn_cxx98_compat_explicit_conversion_functions : 5280 diag::ext_explicit_conversion_functions) 5281 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5282} 5283 5284/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5285/// the declaration of the given C++ conversion function. This routine 5286/// is responsible for recording the conversion function in the C++ 5287/// class, if possible. 5288Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5289 assert(Conversion && "Expected to receive a conversion function declaration"); 5290 5291 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5292 5293 // Make sure we aren't redeclaring the conversion function. 5294 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5295 5296 // C++ [class.conv.fct]p1: 5297 // [...] A conversion function is never used to convert a 5298 // (possibly cv-qualified) object to the (possibly cv-qualified) 5299 // same object type (or a reference to it), to a (possibly 5300 // cv-qualified) base class of that type (or a reference to it), 5301 // or to (possibly cv-qualified) void. 5302 // FIXME: Suppress this warning if the conversion function ends up being a 5303 // virtual function that overrides a virtual function in a base class. 5304 QualType ClassType 5305 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5306 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5307 ConvType = ConvTypeRef->getPointeeType(); 5308 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5309 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5310 /* Suppress diagnostics for instantiations. */; 5311 else if (ConvType->isRecordType()) { 5312 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5313 if (ConvType == ClassType) 5314 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5315 << ClassType; 5316 else if (IsDerivedFrom(ClassType, ConvType)) 5317 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5318 << ClassType << ConvType; 5319 } else if (ConvType->isVoidType()) { 5320 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5321 << ClassType << ConvType; 5322 } 5323 5324 if (FunctionTemplateDecl *ConversionTemplate 5325 = Conversion->getDescribedFunctionTemplate()) 5326 return ConversionTemplate; 5327 5328 return Conversion; 5329} 5330 5331//===----------------------------------------------------------------------===// 5332// Namespace Handling 5333//===----------------------------------------------------------------------===// 5334 5335 5336 5337/// ActOnStartNamespaceDef - This is called at the start of a namespace 5338/// definition. 5339Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5340 SourceLocation InlineLoc, 5341 SourceLocation NamespaceLoc, 5342 SourceLocation IdentLoc, 5343 IdentifierInfo *II, 5344 SourceLocation LBrace, 5345 AttributeList *AttrList) { 5346 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5347 // For anonymous namespace, take the location of the left brace. 5348 SourceLocation Loc = II ? IdentLoc : LBrace; 5349 bool IsInline = InlineLoc.isValid(); 5350 bool IsInvalid = false; 5351 bool IsStd = false; 5352 bool AddToKnown = false; 5353 Scope *DeclRegionScope = NamespcScope->getParent(); 5354 5355 NamespaceDecl *PrevNS = 0; 5356 if (II) { 5357 // C++ [namespace.def]p2: 5358 // The identifier in an original-namespace-definition shall not 5359 // have been previously defined in the declarative region in 5360 // which the original-namespace-definition appears. The 5361 // identifier in an original-namespace-definition is the name of 5362 // the namespace. Subsequently in that declarative region, it is 5363 // treated as an original-namespace-name. 5364 // 5365 // Since namespace names are unique in their scope, and we don't 5366 // look through using directives, just look for any ordinary names. 5367 5368 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5369 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5370 Decl::IDNS_Namespace; 5371 NamedDecl *PrevDecl = 0; 5372 for (DeclContext::lookup_result R 5373 = CurContext->getRedeclContext()->lookup(II); 5374 R.first != R.second; ++R.first) { 5375 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5376 PrevDecl = *R.first; 5377 break; 5378 } 5379 } 5380 5381 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5382 5383 if (PrevNS) { 5384 // This is an extended namespace definition. 5385 if (IsInline != PrevNS->isInline()) { 5386 // inline-ness must match 5387 if (PrevNS->isInline()) { 5388 // The user probably just forgot the 'inline', so suggest that it 5389 // be added back. 5390 Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5391 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5392 } else { 5393 Diag(Loc, diag::err_inline_namespace_mismatch) 5394 << IsInline; 5395 } 5396 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5397 5398 IsInline = PrevNS->isInline(); 5399 } 5400 } else if (PrevDecl) { 5401 // This is an invalid name redefinition. 5402 Diag(Loc, diag::err_redefinition_different_kind) 5403 << II; 5404 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5405 IsInvalid = true; 5406 // Continue on to push Namespc as current DeclContext and return it. 5407 } else if (II->isStr("std") && 5408 CurContext->getRedeclContext()->isTranslationUnit()) { 5409 // This is the first "real" definition of the namespace "std", so update 5410 // our cache of the "std" namespace to point at this definition. 5411 PrevNS = getStdNamespace(); 5412 IsStd = true; 5413 AddToKnown = !IsInline; 5414 } else { 5415 // We've seen this namespace for the first time. 5416 AddToKnown = !IsInline; 5417 } 5418 } else { 5419 // Anonymous namespaces. 5420 5421 // Determine whether the parent already has an anonymous namespace. 5422 DeclContext *Parent = CurContext->getRedeclContext(); 5423 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5424 PrevNS = TU->getAnonymousNamespace(); 5425 } else { 5426 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5427 PrevNS = ND->getAnonymousNamespace(); 5428 } 5429 5430 if (PrevNS && IsInline != PrevNS->isInline()) { 5431 // inline-ness must match 5432 Diag(Loc, diag::err_inline_namespace_mismatch) 5433 << IsInline; 5434 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5435 5436 // Recover by ignoring the new namespace's inline status. 5437 IsInline = PrevNS->isInline(); 5438 } 5439 } 5440 5441 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5442 StartLoc, Loc, II, PrevNS); 5443 if (IsInvalid) 5444 Namespc->setInvalidDecl(); 5445 5446 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5447 5448 // FIXME: Should we be merging attributes? 5449 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5450 PushNamespaceVisibilityAttr(Attr, Loc); 5451 5452 if (IsStd) 5453 StdNamespace = Namespc; 5454 if (AddToKnown) 5455 KnownNamespaces[Namespc] = false; 5456 5457 if (II) { 5458 PushOnScopeChains(Namespc, DeclRegionScope); 5459 } else { 5460 // Link the anonymous namespace into its parent. 5461 DeclContext *Parent = CurContext->getRedeclContext(); 5462 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5463 TU->setAnonymousNamespace(Namespc); 5464 } else { 5465 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5466 } 5467 5468 CurContext->addDecl(Namespc); 5469 5470 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5471 // behaves as if it were replaced by 5472 // namespace unique { /* empty body */ } 5473 // using namespace unique; 5474 // namespace unique { namespace-body } 5475 // where all occurrences of 'unique' in a translation unit are 5476 // replaced by the same identifier and this identifier differs 5477 // from all other identifiers in the entire program. 5478 5479 // We just create the namespace with an empty name and then add an 5480 // implicit using declaration, just like the standard suggests. 5481 // 5482 // CodeGen enforces the "universally unique" aspect by giving all 5483 // declarations semantically contained within an anonymous 5484 // namespace internal linkage. 5485 5486 if (!PrevNS) { 5487 UsingDirectiveDecl* UD 5488 = UsingDirectiveDecl::Create(Context, CurContext, 5489 /* 'using' */ LBrace, 5490 /* 'namespace' */ SourceLocation(), 5491 /* qualifier */ NestedNameSpecifierLoc(), 5492 /* identifier */ SourceLocation(), 5493 Namespc, 5494 /* Ancestor */ CurContext); 5495 UD->setImplicit(); 5496 CurContext->addDecl(UD); 5497 } 5498 } 5499 5500 // Although we could have an invalid decl (i.e. the namespace name is a 5501 // redefinition), push it as current DeclContext and try to continue parsing. 5502 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5503 // for the namespace has the declarations that showed up in that particular 5504 // namespace definition. 5505 PushDeclContext(NamespcScope, Namespc); 5506 return Namespc; 5507} 5508 5509/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5510/// is a namespace alias, returns the namespace it points to. 5511static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5512 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5513 return AD->getNamespace(); 5514 return dyn_cast_or_null<NamespaceDecl>(D); 5515} 5516 5517/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5518/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5519void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5520 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5521 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5522 Namespc->setRBraceLoc(RBrace); 5523 PopDeclContext(); 5524 if (Namespc->hasAttr<VisibilityAttr>()) 5525 PopPragmaVisibility(true, RBrace); 5526} 5527 5528CXXRecordDecl *Sema::getStdBadAlloc() const { 5529 return cast_or_null<CXXRecordDecl>( 5530 StdBadAlloc.get(Context.getExternalSource())); 5531} 5532 5533NamespaceDecl *Sema::getStdNamespace() const { 5534 return cast_or_null<NamespaceDecl>( 5535 StdNamespace.get(Context.getExternalSource())); 5536} 5537 5538/// \brief Retrieve the special "std" namespace, which may require us to 5539/// implicitly define the namespace. 5540NamespaceDecl *Sema::getOrCreateStdNamespace() { 5541 if (!StdNamespace) { 5542 // The "std" namespace has not yet been defined, so build one implicitly. 5543 StdNamespace = NamespaceDecl::Create(Context, 5544 Context.getTranslationUnitDecl(), 5545 /*Inline=*/false, 5546 SourceLocation(), SourceLocation(), 5547 &PP.getIdentifierTable().get("std"), 5548 /*PrevDecl=*/0); 5549 getStdNamespace()->setImplicit(true); 5550 } 5551 5552 return getStdNamespace(); 5553} 5554 5555bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 5556 assert(getLangOptions().CPlusPlus && 5557 "Looking for std::initializer_list outside of C++."); 5558 5559 // We're looking for implicit instantiations of 5560 // template <typename E> class std::initializer_list. 5561 5562 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 5563 return false; 5564 5565 ClassTemplateDecl *Template = 0; 5566 const TemplateArgument *Arguments = 0; 5567 5568 if (const RecordType *RT = Ty->getAs<RecordType>()) { 5569 5570 ClassTemplateSpecializationDecl *Specialization = 5571 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 5572 if (!Specialization) 5573 return false; 5574 5575 Template = Specialization->getSpecializedTemplate(); 5576 Arguments = Specialization->getTemplateArgs().data(); 5577 } else if (const TemplateSpecializationType *TST = 5578 Ty->getAs<TemplateSpecializationType>()) { 5579 Template = dyn_cast_or_null<ClassTemplateDecl>( 5580 TST->getTemplateName().getAsTemplateDecl()); 5581 Arguments = TST->getArgs(); 5582 } 5583 if (!Template) 5584 return false; 5585 5586 if (!StdInitializerList) { 5587 // Haven't recognized std::initializer_list yet, maybe this is it. 5588 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 5589 if (TemplateClass->getIdentifier() != 5590 &PP.getIdentifierTable().get("initializer_list") || 5591 !getStdNamespace()->InEnclosingNamespaceSetOf( 5592 TemplateClass->getDeclContext())) 5593 return false; 5594 // This is a template called std::initializer_list, but is it the right 5595 // template? 5596 TemplateParameterList *Params = Template->getTemplateParameters(); 5597 if (Params->getMinRequiredArguments() != 1) 5598 return false; 5599 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 5600 return false; 5601 5602 // It's the right template. 5603 StdInitializerList = Template; 5604 } 5605 5606 if (Template != StdInitializerList) 5607 return false; 5608 5609 // This is an instance of std::initializer_list. Find the argument type. 5610 if (Element) 5611 *Element = Arguments[0].getAsType(); 5612 return true; 5613} 5614 5615static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 5616 NamespaceDecl *Std = S.getStdNamespace(); 5617 if (!Std) { 5618 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5619 return 0; 5620 } 5621 5622 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 5623 Loc, Sema::LookupOrdinaryName); 5624 if (!S.LookupQualifiedName(Result, Std)) { 5625 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5626 return 0; 5627 } 5628 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 5629 if (!Template) { 5630 Result.suppressDiagnostics(); 5631 // We found something weird. Complain about the first thing we found. 5632 NamedDecl *Found = *Result.begin(); 5633 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 5634 return 0; 5635 } 5636 5637 // We found some template called std::initializer_list. Now verify that it's 5638 // correct. 5639 TemplateParameterList *Params = Template->getTemplateParameters(); 5640 if (Params->getMinRequiredArguments() != 1 || 5641 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 5642 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 5643 return 0; 5644 } 5645 5646 return Template; 5647} 5648 5649QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 5650 if (!StdInitializerList) { 5651 StdInitializerList = LookupStdInitializerList(*this, Loc); 5652 if (!StdInitializerList) 5653 return QualType(); 5654 } 5655 5656 TemplateArgumentListInfo Args(Loc, Loc); 5657 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 5658 Context.getTrivialTypeSourceInfo(Element, 5659 Loc))); 5660 return Context.getCanonicalType( 5661 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 5662} 5663 5664bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 5665 // C++ [dcl.init.list]p2: 5666 // A constructor is an initializer-list constructor if its first parameter 5667 // is of type std::initializer_list<E> or reference to possibly cv-qualified 5668 // std::initializer_list<E> for some type E, and either there are no other 5669 // parameters or else all other parameters have default arguments. 5670 if (Ctor->getNumParams() < 1 || 5671 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 5672 return false; 5673 5674 QualType ArgType = Ctor->getParamDecl(0)->getType(); 5675 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 5676 ArgType = RT->getPointeeType().getUnqualifiedType(); 5677 5678 return isStdInitializerList(ArgType, 0); 5679} 5680 5681/// \brief Determine whether a using statement is in a context where it will be 5682/// apply in all contexts. 5683static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5684 switch (CurContext->getDeclKind()) { 5685 case Decl::TranslationUnit: 5686 return true; 5687 case Decl::LinkageSpec: 5688 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5689 default: 5690 return false; 5691 } 5692} 5693 5694namespace { 5695 5696// Callback to only accept typo corrections that are namespaces. 5697class NamespaceValidatorCCC : public CorrectionCandidateCallback { 5698 public: 5699 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5700 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 5701 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 5702 } 5703 return false; 5704 } 5705}; 5706 5707} 5708 5709static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5710 CXXScopeSpec &SS, 5711 SourceLocation IdentLoc, 5712 IdentifierInfo *Ident) { 5713 NamespaceValidatorCCC Validator; 5714 R.clear(); 5715 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5716 R.getLookupKind(), Sc, &SS, 5717 Validator)) { 5718 std::string CorrectedStr(Corrected.getAsString(S.getLangOptions())); 5719 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOptions())); 5720 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5721 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5722 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5723 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5724 else 5725 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5726 << Ident << CorrectedQuotedStr 5727 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5728 5729 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5730 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5731 5732 Ident = Corrected.getCorrectionAsIdentifierInfo(); 5733 R.addDecl(Corrected.getCorrectionDecl()); 5734 return true; 5735 } 5736 return false; 5737} 5738 5739Decl *Sema::ActOnUsingDirective(Scope *S, 5740 SourceLocation UsingLoc, 5741 SourceLocation NamespcLoc, 5742 CXXScopeSpec &SS, 5743 SourceLocation IdentLoc, 5744 IdentifierInfo *NamespcName, 5745 AttributeList *AttrList) { 5746 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5747 assert(NamespcName && "Invalid NamespcName."); 5748 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5749 5750 // This can only happen along a recovery path. 5751 while (S->getFlags() & Scope::TemplateParamScope) 5752 S = S->getParent(); 5753 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5754 5755 UsingDirectiveDecl *UDir = 0; 5756 NestedNameSpecifier *Qualifier = 0; 5757 if (SS.isSet()) 5758 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5759 5760 // Lookup namespace name. 5761 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5762 LookupParsedName(R, S, &SS); 5763 if (R.isAmbiguous()) 5764 return 0; 5765 5766 if (R.empty()) { 5767 R.clear(); 5768 // Allow "using namespace std;" or "using namespace ::std;" even if 5769 // "std" hasn't been defined yet, for GCC compatibility. 5770 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5771 NamespcName->isStr("std")) { 5772 Diag(IdentLoc, diag::ext_using_undefined_std); 5773 R.addDecl(getOrCreateStdNamespace()); 5774 R.resolveKind(); 5775 } 5776 // Otherwise, attempt typo correction. 5777 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5778 } 5779 5780 if (!R.empty()) { 5781 NamedDecl *Named = R.getFoundDecl(); 5782 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5783 && "expected namespace decl"); 5784 // C++ [namespace.udir]p1: 5785 // A using-directive specifies that the names in the nominated 5786 // namespace can be used in the scope in which the 5787 // using-directive appears after the using-directive. During 5788 // unqualified name lookup (3.4.1), the names appear as if they 5789 // were declared in the nearest enclosing namespace which 5790 // contains both the using-directive and the nominated 5791 // namespace. [Note: in this context, "contains" means "contains 5792 // directly or indirectly". ] 5793 5794 // Find enclosing context containing both using-directive and 5795 // nominated namespace. 5796 NamespaceDecl *NS = getNamespaceDecl(Named); 5797 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5798 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5799 CommonAncestor = CommonAncestor->getParent(); 5800 5801 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5802 SS.getWithLocInContext(Context), 5803 IdentLoc, Named, CommonAncestor); 5804 5805 if (IsUsingDirectiveInToplevelContext(CurContext) && 5806 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5807 Diag(IdentLoc, diag::warn_using_directive_in_header); 5808 } 5809 5810 PushUsingDirective(S, UDir); 5811 } else { 5812 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5813 } 5814 5815 // FIXME: We ignore attributes for now. 5816 return UDir; 5817} 5818 5819void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5820 // If scope has associated entity, then using directive is at namespace 5821 // or translation unit scope. We add UsingDirectiveDecls, into 5822 // it's lookup structure. 5823 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 5824 Ctx->addDecl(UDir); 5825 else 5826 // Otherwise it is block-sope. using-directives will affect lookup 5827 // only to the end of scope. 5828 S->PushUsingDirective(UDir); 5829} 5830 5831 5832Decl *Sema::ActOnUsingDeclaration(Scope *S, 5833 AccessSpecifier AS, 5834 bool HasUsingKeyword, 5835 SourceLocation UsingLoc, 5836 CXXScopeSpec &SS, 5837 UnqualifiedId &Name, 5838 AttributeList *AttrList, 5839 bool IsTypeName, 5840 SourceLocation TypenameLoc) { 5841 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5842 5843 switch (Name.getKind()) { 5844 case UnqualifiedId::IK_ImplicitSelfParam: 5845 case UnqualifiedId::IK_Identifier: 5846 case UnqualifiedId::IK_OperatorFunctionId: 5847 case UnqualifiedId::IK_LiteralOperatorId: 5848 case UnqualifiedId::IK_ConversionFunctionId: 5849 break; 5850 5851 case UnqualifiedId::IK_ConstructorName: 5852 case UnqualifiedId::IK_ConstructorTemplateId: 5853 // C++0x inherited constructors. 5854 Diag(Name.getSourceRange().getBegin(), 5855 getLangOptions().CPlusPlus0x ? 5856 diag::warn_cxx98_compat_using_decl_constructor : 5857 diag::err_using_decl_constructor) 5858 << SS.getRange(); 5859 5860 if (getLangOptions().CPlusPlus0x) break; 5861 5862 return 0; 5863 5864 case UnqualifiedId::IK_DestructorName: 5865 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 5866 << SS.getRange(); 5867 return 0; 5868 5869 case UnqualifiedId::IK_TemplateId: 5870 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 5871 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5872 return 0; 5873 } 5874 5875 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5876 DeclarationName TargetName = TargetNameInfo.getName(); 5877 if (!TargetName) 5878 return 0; 5879 5880 // Warn about using declarations. 5881 // TODO: store that the declaration was written without 'using' and 5882 // talk about access decls instead of using decls in the 5883 // diagnostics. 5884 if (!HasUsingKeyword) { 5885 UsingLoc = Name.getSourceRange().getBegin(); 5886 5887 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5888 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5889 } 5890 5891 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5892 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5893 return 0; 5894 5895 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5896 TargetNameInfo, AttrList, 5897 /* IsInstantiation */ false, 5898 IsTypeName, TypenameLoc); 5899 if (UD) 5900 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5901 5902 return UD; 5903} 5904 5905/// \brief Determine whether a using declaration considers the given 5906/// declarations as "equivalent", e.g., if they are redeclarations of 5907/// the same entity or are both typedefs of the same type. 5908static bool 5909IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5910 bool &SuppressRedeclaration) { 5911 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5912 SuppressRedeclaration = false; 5913 return true; 5914 } 5915 5916 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5917 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5918 SuppressRedeclaration = true; 5919 return Context.hasSameType(TD1->getUnderlyingType(), 5920 TD2->getUnderlyingType()); 5921 } 5922 5923 return false; 5924} 5925 5926 5927/// Determines whether to create a using shadow decl for a particular 5928/// decl, given the set of decls existing prior to this using lookup. 5929bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5930 const LookupResult &Previous) { 5931 // Diagnose finding a decl which is not from a base class of the 5932 // current class. We do this now because there are cases where this 5933 // function will silently decide not to build a shadow decl, which 5934 // will pre-empt further diagnostics. 5935 // 5936 // We don't need to do this in C++0x because we do the check once on 5937 // the qualifier. 5938 // 5939 // FIXME: diagnose the following if we care enough: 5940 // struct A { int foo; }; 5941 // struct B : A { using A::foo; }; 5942 // template <class T> struct C : A {}; 5943 // template <class T> struct D : C<T> { using B::foo; } // <--- 5944 // This is invalid (during instantiation) in C++03 because B::foo 5945 // resolves to the using decl in B, which is not a base class of D<T>. 5946 // We can't diagnose it immediately because C<T> is an unknown 5947 // specialization. The UsingShadowDecl in D<T> then points directly 5948 // to A::foo, which will look well-formed when we instantiate. 5949 // The right solution is to not collapse the shadow-decl chain. 5950 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 5951 DeclContext *OrigDC = Orig->getDeclContext(); 5952 5953 // Handle enums and anonymous structs. 5954 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5955 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5956 while (OrigRec->isAnonymousStructOrUnion()) 5957 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5958 5959 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5960 if (OrigDC == CurContext) { 5961 Diag(Using->getLocation(), 5962 diag::err_using_decl_nested_name_specifier_is_current_class) 5963 << Using->getQualifierLoc().getSourceRange(); 5964 Diag(Orig->getLocation(), diag::note_using_decl_target); 5965 return true; 5966 } 5967 5968 Diag(Using->getQualifierLoc().getBeginLoc(), 5969 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5970 << Using->getQualifier() 5971 << cast<CXXRecordDecl>(CurContext) 5972 << Using->getQualifierLoc().getSourceRange(); 5973 Diag(Orig->getLocation(), diag::note_using_decl_target); 5974 return true; 5975 } 5976 } 5977 5978 if (Previous.empty()) return false; 5979 5980 NamedDecl *Target = Orig; 5981 if (isa<UsingShadowDecl>(Target)) 5982 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5983 5984 // If the target happens to be one of the previous declarations, we 5985 // don't have a conflict. 5986 // 5987 // FIXME: but we might be increasing its access, in which case we 5988 // should redeclare it. 5989 NamedDecl *NonTag = 0, *Tag = 0; 5990 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5991 I != E; ++I) { 5992 NamedDecl *D = (*I)->getUnderlyingDecl(); 5993 bool Result; 5994 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5995 return Result; 5996 5997 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5998 } 5999 6000 if (Target->isFunctionOrFunctionTemplate()) { 6001 FunctionDecl *FD; 6002 if (isa<FunctionTemplateDecl>(Target)) 6003 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6004 else 6005 FD = cast<FunctionDecl>(Target); 6006 6007 NamedDecl *OldDecl = 0; 6008 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6009 case Ovl_Overload: 6010 return false; 6011 6012 case Ovl_NonFunction: 6013 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6014 break; 6015 6016 // We found a decl with the exact signature. 6017 case Ovl_Match: 6018 // If we're in a record, we want to hide the target, so we 6019 // return true (without a diagnostic) to tell the caller not to 6020 // build a shadow decl. 6021 if (CurContext->isRecord()) 6022 return true; 6023 6024 // If we're not in a record, this is an error. 6025 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6026 break; 6027 } 6028 6029 Diag(Target->getLocation(), diag::note_using_decl_target); 6030 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6031 return true; 6032 } 6033 6034 // Target is not a function. 6035 6036 if (isa<TagDecl>(Target)) { 6037 // No conflict between a tag and a non-tag. 6038 if (!Tag) return false; 6039 6040 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6041 Diag(Target->getLocation(), diag::note_using_decl_target); 6042 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6043 return true; 6044 } 6045 6046 // No conflict between a tag and a non-tag. 6047 if (!NonTag) return false; 6048 6049 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6050 Diag(Target->getLocation(), diag::note_using_decl_target); 6051 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6052 return true; 6053} 6054 6055/// Builds a shadow declaration corresponding to a 'using' declaration. 6056UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6057 UsingDecl *UD, 6058 NamedDecl *Orig) { 6059 6060 // If we resolved to another shadow declaration, just coalesce them. 6061 NamedDecl *Target = Orig; 6062 if (isa<UsingShadowDecl>(Target)) { 6063 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6064 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6065 } 6066 6067 UsingShadowDecl *Shadow 6068 = UsingShadowDecl::Create(Context, CurContext, 6069 UD->getLocation(), UD, Target); 6070 UD->addShadowDecl(Shadow); 6071 6072 Shadow->setAccess(UD->getAccess()); 6073 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6074 Shadow->setInvalidDecl(); 6075 6076 if (S) 6077 PushOnScopeChains(Shadow, S); 6078 else 6079 CurContext->addDecl(Shadow); 6080 6081 6082 return Shadow; 6083} 6084 6085/// Hides a using shadow declaration. This is required by the current 6086/// using-decl implementation when a resolvable using declaration in a 6087/// class is followed by a declaration which would hide or override 6088/// one or more of the using decl's targets; for example: 6089/// 6090/// struct Base { void foo(int); }; 6091/// struct Derived : Base { 6092/// using Base::foo; 6093/// void foo(int); 6094/// }; 6095/// 6096/// The governing language is C++03 [namespace.udecl]p12: 6097/// 6098/// When a using-declaration brings names from a base class into a 6099/// derived class scope, member functions in the derived class 6100/// override and/or hide member functions with the same name and 6101/// parameter types in a base class (rather than conflicting). 6102/// 6103/// There are two ways to implement this: 6104/// (1) optimistically create shadow decls when they're not hidden 6105/// by existing declarations, or 6106/// (2) don't create any shadow decls (or at least don't make them 6107/// visible) until we've fully parsed/instantiated the class. 6108/// The problem with (1) is that we might have to retroactively remove 6109/// a shadow decl, which requires several O(n) operations because the 6110/// decl structures are (very reasonably) not designed for removal. 6111/// (2) avoids this but is very fiddly and phase-dependent. 6112void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6113 if (Shadow->getDeclName().getNameKind() == 6114 DeclarationName::CXXConversionFunctionName) 6115 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6116 6117 // Remove it from the DeclContext... 6118 Shadow->getDeclContext()->removeDecl(Shadow); 6119 6120 // ...and the scope, if applicable... 6121 if (S) { 6122 S->RemoveDecl(Shadow); 6123 IdResolver.RemoveDecl(Shadow); 6124 } 6125 6126 // ...and the using decl. 6127 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6128 6129 // TODO: complain somehow if Shadow was used. It shouldn't 6130 // be possible for this to happen, because...? 6131} 6132 6133/// Builds a using declaration. 6134/// 6135/// \param IsInstantiation - Whether this call arises from an 6136/// instantiation of an unresolved using declaration. We treat 6137/// the lookup differently for these declarations. 6138NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6139 SourceLocation UsingLoc, 6140 CXXScopeSpec &SS, 6141 const DeclarationNameInfo &NameInfo, 6142 AttributeList *AttrList, 6143 bool IsInstantiation, 6144 bool IsTypeName, 6145 SourceLocation TypenameLoc) { 6146 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6147 SourceLocation IdentLoc = NameInfo.getLoc(); 6148 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6149 6150 // FIXME: We ignore attributes for now. 6151 6152 if (SS.isEmpty()) { 6153 Diag(IdentLoc, diag::err_using_requires_qualname); 6154 return 0; 6155 } 6156 6157 // Do the redeclaration lookup in the current scope. 6158 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6159 ForRedeclaration); 6160 Previous.setHideTags(false); 6161 if (S) { 6162 LookupName(Previous, S); 6163 6164 // It is really dumb that we have to do this. 6165 LookupResult::Filter F = Previous.makeFilter(); 6166 while (F.hasNext()) { 6167 NamedDecl *D = F.next(); 6168 if (!isDeclInScope(D, CurContext, S)) 6169 F.erase(); 6170 } 6171 F.done(); 6172 } else { 6173 assert(IsInstantiation && "no scope in non-instantiation"); 6174 assert(CurContext->isRecord() && "scope not record in instantiation"); 6175 LookupQualifiedName(Previous, CurContext); 6176 } 6177 6178 // Check for invalid redeclarations. 6179 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6180 return 0; 6181 6182 // Check for bad qualifiers. 6183 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6184 return 0; 6185 6186 DeclContext *LookupContext = computeDeclContext(SS); 6187 NamedDecl *D; 6188 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6189 if (!LookupContext) { 6190 if (IsTypeName) { 6191 // FIXME: not all declaration name kinds are legal here 6192 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6193 UsingLoc, TypenameLoc, 6194 QualifierLoc, 6195 IdentLoc, NameInfo.getName()); 6196 } else { 6197 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6198 QualifierLoc, NameInfo); 6199 } 6200 } else { 6201 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6202 NameInfo, IsTypeName); 6203 } 6204 D->setAccess(AS); 6205 CurContext->addDecl(D); 6206 6207 if (!LookupContext) return D; 6208 UsingDecl *UD = cast<UsingDecl>(D); 6209 6210 if (RequireCompleteDeclContext(SS, LookupContext)) { 6211 UD->setInvalidDecl(); 6212 return UD; 6213 } 6214 6215 // Constructor inheriting using decls get special treatment. 6216 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6217 if (CheckInheritedConstructorUsingDecl(UD)) 6218 UD->setInvalidDecl(); 6219 return UD; 6220 } 6221 6222 // Otherwise, look up the target name. 6223 6224 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6225 6226 // Unlike most lookups, we don't always want to hide tag 6227 // declarations: tag names are visible through the using declaration 6228 // even if hidden by ordinary names, *except* in a dependent context 6229 // where it's important for the sanity of two-phase lookup. 6230 if (!IsInstantiation) 6231 R.setHideTags(false); 6232 6233 LookupQualifiedName(R, LookupContext); 6234 6235 if (R.empty()) { 6236 Diag(IdentLoc, diag::err_no_member) 6237 << NameInfo.getName() << LookupContext << SS.getRange(); 6238 UD->setInvalidDecl(); 6239 return UD; 6240 } 6241 6242 if (R.isAmbiguous()) { 6243 UD->setInvalidDecl(); 6244 return UD; 6245 } 6246 6247 if (IsTypeName) { 6248 // If we asked for a typename and got a non-type decl, error out. 6249 if (!R.getAsSingle<TypeDecl>()) { 6250 Diag(IdentLoc, diag::err_using_typename_non_type); 6251 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6252 Diag((*I)->getUnderlyingDecl()->getLocation(), 6253 diag::note_using_decl_target); 6254 UD->setInvalidDecl(); 6255 return UD; 6256 } 6257 } else { 6258 // If we asked for a non-typename and we got a type, error out, 6259 // but only if this is an instantiation of an unresolved using 6260 // decl. Otherwise just silently find the type name. 6261 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6262 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6263 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6264 UD->setInvalidDecl(); 6265 return UD; 6266 } 6267 } 6268 6269 // C++0x N2914 [namespace.udecl]p6: 6270 // A using-declaration shall not name a namespace. 6271 if (R.getAsSingle<NamespaceDecl>()) { 6272 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6273 << SS.getRange(); 6274 UD->setInvalidDecl(); 6275 return UD; 6276 } 6277 6278 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6279 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6280 BuildUsingShadowDecl(S, UD, *I); 6281 } 6282 6283 return UD; 6284} 6285 6286/// Additional checks for a using declaration referring to a constructor name. 6287bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 6288 if (UD->isTypeName()) { 6289 // FIXME: Cannot specify typename when specifying constructor 6290 return true; 6291 } 6292 6293 const Type *SourceType = UD->getQualifier()->getAsType(); 6294 assert(SourceType && 6295 "Using decl naming constructor doesn't have type in scope spec."); 6296 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6297 6298 // Check whether the named type is a direct base class. 6299 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6300 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6301 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6302 BaseIt != BaseE; ++BaseIt) { 6303 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6304 if (CanonicalSourceType == BaseType) 6305 break; 6306 } 6307 6308 if (BaseIt == BaseE) { 6309 // Did not find SourceType in the bases. 6310 Diag(UD->getUsingLocation(), 6311 diag::err_using_decl_constructor_not_in_direct_base) 6312 << UD->getNameInfo().getSourceRange() 6313 << QualType(SourceType, 0) << TargetClass; 6314 return true; 6315 } 6316 6317 BaseIt->setInheritConstructors(); 6318 6319 return false; 6320} 6321 6322/// Checks that the given using declaration is not an invalid 6323/// redeclaration. Note that this is checking only for the using decl 6324/// itself, not for any ill-formedness among the UsingShadowDecls. 6325bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6326 bool isTypeName, 6327 const CXXScopeSpec &SS, 6328 SourceLocation NameLoc, 6329 const LookupResult &Prev) { 6330 // C++03 [namespace.udecl]p8: 6331 // C++0x [namespace.udecl]p10: 6332 // A using-declaration is a declaration and can therefore be used 6333 // repeatedly where (and only where) multiple declarations are 6334 // allowed. 6335 // 6336 // That's in non-member contexts. 6337 if (!CurContext->getRedeclContext()->isRecord()) 6338 return false; 6339 6340 NestedNameSpecifier *Qual 6341 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6342 6343 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6344 NamedDecl *D = *I; 6345 6346 bool DTypename; 6347 NestedNameSpecifier *DQual; 6348 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6349 DTypename = UD->isTypeName(); 6350 DQual = UD->getQualifier(); 6351 } else if (UnresolvedUsingValueDecl *UD 6352 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6353 DTypename = false; 6354 DQual = UD->getQualifier(); 6355 } else if (UnresolvedUsingTypenameDecl *UD 6356 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6357 DTypename = true; 6358 DQual = UD->getQualifier(); 6359 } else continue; 6360 6361 // using decls differ if one says 'typename' and the other doesn't. 6362 // FIXME: non-dependent using decls? 6363 if (isTypeName != DTypename) continue; 6364 6365 // using decls differ if they name different scopes (but note that 6366 // template instantiation can cause this check to trigger when it 6367 // didn't before instantiation). 6368 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6369 Context.getCanonicalNestedNameSpecifier(DQual)) 6370 continue; 6371 6372 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6373 Diag(D->getLocation(), diag::note_using_decl) << 1; 6374 return true; 6375 } 6376 6377 return false; 6378} 6379 6380 6381/// Checks that the given nested-name qualifier used in a using decl 6382/// in the current context is appropriately related to the current 6383/// scope. If an error is found, diagnoses it and returns true. 6384bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6385 const CXXScopeSpec &SS, 6386 SourceLocation NameLoc) { 6387 DeclContext *NamedContext = computeDeclContext(SS); 6388 6389 if (!CurContext->isRecord()) { 6390 // C++03 [namespace.udecl]p3: 6391 // C++0x [namespace.udecl]p8: 6392 // A using-declaration for a class member shall be a member-declaration. 6393 6394 // If we weren't able to compute a valid scope, it must be a 6395 // dependent class scope. 6396 if (!NamedContext || NamedContext->isRecord()) { 6397 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6398 << SS.getRange(); 6399 return true; 6400 } 6401 6402 // Otherwise, everything is known to be fine. 6403 return false; 6404 } 6405 6406 // The current scope is a record. 6407 6408 // If the named context is dependent, we can't decide much. 6409 if (!NamedContext) { 6410 // FIXME: in C++0x, we can diagnose if we can prove that the 6411 // nested-name-specifier does not refer to a base class, which is 6412 // still possible in some cases. 6413 6414 // Otherwise we have to conservatively report that things might be 6415 // okay. 6416 return false; 6417 } 6418 6419 if (!NamedContext->isRecord()) { 6420 // Ideally this would point at the last name in the specifier, 6421 // but we don't have that level of source info. 6422 Diag(SS.getRange().getBegin(), 6423 diag::err_using_decl_nested_name_specifier_is_not_class) 6424 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6425 return true; 6426 } 6427 6428 if (!NamedContext->isDependentContext() && 6429 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6430 return true; 6431 6432 if (getLangOptions().CPlusPlus0x) { 6433 // C++0x [namespace.udecl]p3: 6434 // In a using-declaration used as a member-declaration, the 6435 // nested-name-specifier shall name a base class of the class 6436 // being defined. 6437 6438 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6439 cast<CXXRecordDecl>(NamedContext))) { 6440 if (CurContext == NamedContext) { 6441 Diag(NameLoc, 6442 diag::err_using_decl_nested_name_specifier_is_current_class) 6443 << SS.getRange(); 6444 return true; 6445 } 6446 6447 Diag(SS.getRange().getBegin(), 6448 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6449 << (NestedNameSpecifier*) SS.getScopeRep() 6450 << cast<CXXRecordDecl>(CurContext) 6451 << SS.getRange(); 6452 return true; 6453 } 6454 6455 return false; 6456 } 6457 6458 // C++03 [namespace.udecl]p4: 6459 // A using-declaration used as a member-declaration shall refer 6460 // to a member of a base class of the class being defined [etc.]. 6461 6462 // Salient point: SS doesn't have to name a base class as long as 6463 // lookup only finds members from base classes. Therefore we can 6464 // diagnose here only if we can prove that that can't happen, 6465 // i.e. if the class hierarchies provably don't intersect. 6466 6467 // TODO: it would be nice if "definitely valid" results were cached 6468 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6469 // need to be repeated. 6470 6471 struct UserData { 6472 llvm::DenseSet<const CXXRecordDecl*> Bases; 6473 6474 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6475 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6476 Data->Bases.insert(Base); 6477 return true; 6478 } 6479 6480 bool hasDependentBases(const CXXRecordDecl *Class) { 6481 return !Class->forallBases(collect, this); 6482 } 6483 6484 /// Returns true if the base is dependent or is one of the 6485 /// accumulated base classes. 6486 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6487 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6488 return !Data->Bases.count(Base); 6489 } 6490 6491 bool mightShareBases(const CXXRecordDecl *Class) { 6492 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6493 } 6494 }; 6495 6496 UserData Data; 6497 6498 // Returns false if we find a dependent base. 6499 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6500 return false; 6501 6502 // Returns false if the class has a dependent base or if it or one 6503 // of its bases is present in the base set of the current context. 6504 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6505 return false; 6506 6507 Diag(SS.getRange().getBegin(), 6508 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6509 << (NestedNameSpecifier*) SS.getScopeRep() 6510 << cast<CXXRecordDecl>(CurContext) 6511 << SS.getRange(); 6512 6513 return true; 6514} 6515 6516Decl *Sema::ActOnAliasDeclaration(Scope *S, 6517 AccessSpecifier AS, 6518 MultiTemplateParamsArg TemplateParamLists, 6519 SourceLocation UsingLoc, 6520 UnqualifiedId &Name, 6521 TypeResult Type) { 6522 // Skip up to the relevant declaration scope. 6523 while (S->getFlags() & Scope::TemplateParamScope) 6524 S = S->getParent(); 6525 assert((S->getFlags() & Scope::DeclScope) && 6526 "got alias-declaration outside of declaration scope"); 6527 6528 if (Type.isInvalid()) 6529 return 0; 6530 6531 bool Invalid = false; 6532 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6533 TypeSourceInfo *TInfo = 0; 6534 GetTypeFromParser(Type.get(), &TInfo); 6535 6536 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6537 return 0; 6538 6539 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6540 UPPC_DeclarationType)) { 6541 Invalid = true; 6542 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6543 TInfo->getTypeLoc().getBeginLoc()); 6544 } 6545 6546 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6547 LookupName(Previous, S); 6548 6549 // Warn about shadowing the name of a template parameter. 6550 if (Previous.isSingleResult() && 6551 Previous.getFoundDecl()->isTemplateParameter()) { 6552 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6553 Previous.clear(); 6554 } 6555 6556 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6557 "name in alias declaration must be an identifier"); 6558 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6559 Name.StartLocation, 6560 Name.Identifier, TInfo); 6561 6562 NewTD->setAccess(AS); 6563 6564 if (Invalid) 6565 NewTD->setInvalidDecl(); 6566 6567 CheckTypedefForVariablyModifiedType(S, NewTD); 6568 Invalid |= NewTD->isInvalidDecl(); 6569 6570 bool Redeclaration = false; 6571 6572 NamedDecl *NewND; 6573 if (TemplateParamLists.size()) { 6574 TypeAliasTemplateDecl *OldDecl = 0; 6575 TemplateParameterList *OldTemplateParams = 0; 6576 6577 if (TemplateParamLists.size() != 1) { 6578 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6579 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6580 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6581 } 6582 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6583 6584 // Only consider previous declarations in the same scope. 6585 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6586 /*ExplicitInstantiationOrSpecialization*/false); 6587 if (!Previous.empty()) { 6588 Redeclaration = true; 6589 6590 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6591 if (!OldDecl && !Invalid) { 6592 Diag(UsingLoc, diag::err_redefinition_different_kind) 6593 << Name.Identifier; 6594 6595 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6596 if (OldD->getLocation().isValid()) 6597 Diag(OldD->getLocation(), diag::note_previous_definition); 6598 6599 Invalid = true; 6600 } 6601 6602 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6603 if (TemplateParameterListsAreEqual(TemplateParams, 6604 OldDecl->getTemplateParameters(), 6605 /*Complain=*/true, 6606 TPL_TemplateMatch)) 6607 OldTemplateParams = OldDecl->getTemplateParameters(); 6608 else 6609 Invalid = true; 6610 6611 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6612 if (!Invalid && 6613 !Context.hasSameType(OldTD->getUnderlyingType(), 6614 NewTD->getUnderlyingType())) { 6615 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6616 // but we can't reasonably accept it. 6617 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6618 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6619 if (OldTD->getLocation().isValid()) 6620 Diag(OldTD->getLocation(), diag::note_previous_definition); 6621 Invalid = true; 6622 } 6623 } 6624 } 6625 6626 // Merge any previous default template arguments into our parameters, 6627 // and check the parameter list. 6628 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6629 TPC_TypeAliasTemplate)) 6630 return 0; 6631 6632 TypeAliasTemplateDecl *NewDecl = 6633 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6634 Name.Identifier, TemplateParams, 6635 NewTD); 6636 6637 NewDecl->setAccess(AS); 6638 6639 if (Invalid) 6640 NewDecl->setInvalidDecl(); 6641 else if (OldDecl) 6642 NewDecl->setPreviousDeclaration(OldDecl); 6643 6644 NewND = NewDecl; 6645 } else { 6646 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6647 NewND = NewTD; 6648 } 6649 6650 if (!Redeclaration) 6651 PushOnScopeChains(NewND, S); 6652 6653 return NewND; 6654} 6655 6656Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6657 SourceLocation NamespaceLoc, 6658 SourceLocation AliasLoc, 6659 IdentifierInfo *Alias, 6660 CXXScopeSpec &SS, 6661 SourceLocation IdentLoc, 6662 IdentifierInfo *Ident) { 6663 6664 // Lookup the namespace name. 6665 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6666 LookupParsedName(R, S, &SS); 6667 6668 // Check if we have a previous declaration with the same name. 6669 NamedDecl *PrevDecl 6670 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6671 ForRedeclaration); 6672 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6673 PrevDecl = 0; 6674 6675 if (PrevDecl) { 6676 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6677 // We already have an alias with the same name that points to the same 6678 // namespace, so don't create a new one. 6679 // FIXME: At some point, we'll want to create the (redundant) 6680 // declaration to maintain better source information. 6681 if (!R.isAmbiguous() && !R.empty() && 6682 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6683 return 0; 6684 } 6685 6686 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6687 diag::err_redefinition_different_kind; 6688 Diag(AliasLoc, DiagID) << Alias; 6689 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6690 return 0; 6691 } 6692 6693 if (R.isAmbiguous()) 6694 return 0; 6695 6696 if (R.empty()) { 6697 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6698 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 6699 return 0; 6700 } 6701 } 6702 6703 NamespaceAliasDecl *AliasDecl = 6704 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6705 Alias, SS.getWithLocInContext(Context), 6706 IdentLoc, R.getFoundDecl()); 6707 6708 PushOnScopeChains(AliasDecl, S); 6709 return AliasDecl; 6710} 6711 6712namespace { 6713 /// \brief Scoped object used to handle the state changes required in Sema 6714 /// to implicitly define the body of a C++ member function; 6715 class ImplicitlyDefinedFunctionScope { 6716 Sema &S; 6717 Sema::ContextRAII SavedContext; 6718 6719 public: 6720 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6721 : S(S), SavedContext(S, Method) 6722 { 6723 S.PushFunctionScope(); 6724 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6725 } 6726 6727 ~ImplicitlyDefinedFunctionScope() { 6728 S.PopExpressionEvaluationContext(); 6729 S.PopFunctionScopeInfo(); 6730 } 6731 }; 6732} 6733 6734Sema::ImplicitExceptionSpecification 6735Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6736 // C++ [except.spec]p14: 6737 // An implicitly declared special member function (Clause 12) shall have an 6738 // exception-specification. [...] 6739 ImplicitExceptionSpecification ExceptSpec(Context); 6740 if (ClassDecl->isInvalidDecl()) 6741 return ExceptSpec; 6742 6743 // Direct base-class constructors. 6744 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6745 BEnd = ClassDecl->bases_end(); 6746 B != BEnd; ++B) { 6747 if (B->isVirtual()) // Handled below. 6748 continue; 6749 6750 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6751 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6752 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6753 // If this is a deleted function, add it anyway. This might be conformant 6754 // with the standard. This might not. I'm not sure. It might not matter. 6755 if (Constructor) 6756 ExceptSpec.CalledDecl(Constructor); 6757 } 6758 } 6759 6760 // Virtual base-class constructors. 6761 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6762 BEnd = ClassDecl->vbases_end(); 6763 B != BEnd; ++B) { 6764 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6765 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6766 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6767 // If this is a deleted function, add it anyway. This might be conformant 6768 // with the standard. This might not. I'm not sure. It might not matter. 6769 if (Constructor) 6770 ExceptSpec.CalledDecl(Constructor); 6771 } 6772 } 6773 6774 // Field constructors. 6775 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6776 FEnd = ClassDecl->field_end(); 6777 F != FEnd; ++F) { 6778 if (F->hasInClassInitializer()) { 6779 if (Expr *E = F->getInClassInitializer()) 6780 ExceptSpec.CalledExpr(E); 6781 else if (!F->isInvalidDecl()) 6782 ExceptSpec.SetDelayed(); 6783 } else if (const RecordType *RecordTy 6784 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6785 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6786 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6787 // If this is a deleted function, add it anyway. This might be conformant 6788 // with the standard. This might not. I'm not sure. It might not matter. 6789 // In particular, the problem is that this function never gets called. It 6790 // might just be ill-formed because this function attempts to refer to 6791 // a deleted function here. 6792 if (Constructor) 6793 ExceptSpec.CalledDecl(Constructor); 6794 } 6795 } 6796 6797 return ExceptSpec; 6798} 6799 6800CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6801 CXXRecordDecl *ClassDecl) { 6802 // C++ [class.ctor]p5: 6803 // A default constructor for a class X is a constructor of class X 6804 // that can be called without an argument. If there is no 6805 // user-declared constructor for class X, a default constructor is 6806 // implicitly declared. An implicitly-declared default constructor 6807 // is an inline public member of its class. 6808 assert(!ClassDecl->hasUserDeclaredConstructor() && 6809 "Should not build implicit default constructor!"); 6810 6811 ImplicitExceptionSpecification Spec = 6812 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6813 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6814 6815 // Create the actual constructor declaration. 6816 CanQualType ClassType 6817 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6818 SourceLocation ClassLoc = ClassDecl->getLocation(); 6819 DeclarationName Name 6820 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6821 DeclarationNameInfo NameInfo(Name, ClassLoc); 6822 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 6823 Context, ClassDecl, ClassLoc, NameInfo, 6824 Context.getFunctionType(Context.VoidTy, 0, 0, EPI), /*TInfo=*/0, 6825 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 6826 /*isConstexpr=*/ClassDecl->defaultedDefaultConstructorIsConstexpr() && 6827 getLangOptions().CPlusPlus0x); 6828 DefaultCon->setAccess(AS_public); 6829 DefaultCon->setDefaulted(); 6830 DefaultCon->setImplicit(); 6831 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6832 6833 // Note that we have declared this constructor. 6834 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6835 6836 if (Scope *S = getScopeForContext(ClassDecl)) 6837 PushOnScopeChains(DefaultCon, S, false); 6838 ClassDecl->addDecl(DefaultCon); 6839 6840 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6841 DefaultCon->setDeletedAsWritten(); 6842 6843 return DefaultCon; 6844} 6845 6846void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6847 CXXConstructorDecl *Constructor) { 6848 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6849 !Constructor->doesThisDeclarationHaveABody() && 6850 !Constructor->isDeleted()) && 6851 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6852 6853 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6854 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6855 6856 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6857 DiagnosticErrorTrap Trap(Diags); 6858 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6859 Trap.hasErrorOccurred()) { 6860 Diag(CurrentLocation, diag::note_member_synthesized_at) 6861 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6862 Constructor->setInvalidDecl(); 6863 return; 6864 } 6865 6866 SourceLocation Loc = Constructor->getLocation(); 6867 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6868 6869 Constructor->setUsed(); 6870 MarkVTableUsed(CurrentLocation, ClassDecl); 6871 6872 if (ASTMutationListener *L = getASTMutationListener()) { 6873 L->CompletedImplicitDefinition(Constructor); 6874 } 6875} 6876 6877/// Get any existing defaulted default constructor for the given class. Do not 6878/// implicitly define one if it does not exist. 6879static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6880 CXXRecordDecl *D) { 6881 ASTContext &Context = Self.Context; 6882 QualType ClassType = Context.getTypeDeclType(D); 6883 DeclarationName ConstructorName 6884 = Context.DeclarationNames.getCXXConstructorName( 6885 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6886 6887 DeclContext::lookup_const_iterator Con, ConEnd; 6888 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6889 Con != ConEnd; ++Con) { 6890 // A function template cannot be defaulted. 6891 if (isa<FunctionTemplateDecl>(*Con)) 6892 continue; 6893 6894 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6895 if (Constructor->isDefaultConstructor()) 6896 return Constructor->isDefaulted() ? Constructor : 0; 6897 } 6898 return 0; 6899} 6900 6901void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6902 if (!D) return; 6903 AdjustDeclIfTemplate(D); 6904 6905 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6906 CXXConstructorDecl *CtorDecl 6907 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6908 6909 if (!CtorDecl) return; 6910 6911 // Compute the exception specification for the default constructor. 6912 const FunctionProtoType *CtorTy = 6913 CtorDecl->getType()->castAs<FunctionProtoType>(); 6914 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6915 ImplicitExceptionSpecification Spec = 6916 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6917 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6918 assert(EPI.ExceptionSpecType != EST_Delayed); 6919 6920 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6921 } 6922 6923 // If the default constructor is explicitly defaulted, checking the exception 6924 // specification is deferred until now. 6925 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 6926 !ClassDecl->isDependentType()) 6927 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 6928} 6929 6930void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6931 // We start with an initial pass over the base classes to collect those that 6932 // inherit constructors from. If there are none, we can forgo all further 6933 // processing. 6934 typedef SmallVector<const RecordType *, 4> BasesVector; 6935 BasesVector BasesToInheritFrom; 6936 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6937 BaseE = ClassDecl->bases_end(); 6938 BaseIt != BaseE; ++BaseIt) { 6939 if (BaseIt->getInheritConstructors()) { 6940 QualType Base = BaseIt->getType(); 6941 if (Base->isDependentType()) { 6942 // If we inherit constructors from anything that is dependent, just 6943 // abort processing altogether. We'll get another chance for the 6944 // instantiations. 6945 return; 6946 } 6947 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6948 } 6949 } 6950 if (BasesToInheritFrom.empty()) 6951 return; 6952 6953 // Now collect the constructors that we already have in the current class. 6954 // Those take precedence over inherited constructors. 6955 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6956 // unless there is a user-declared constructor with the same signature in 6957 // the class where the using-declaration appears. 6958 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6959 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6960 CtorE = ClassDecl->ctor_end(); 6961 CtorIt != CtorE; ++CtorIt) { 6962 ExistingConstructors.insert( 6963 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6964 } 6965 6966 Scope *S = getScopeForContext(ClassDecl); 6967 DeclarationName CreatedCtorName = 6968 Context.DeclarationNames.getCXXConstructorName( 6969 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6970 6971 // Now comes the true work. 6972 // First, we keep a map from constructor types to the base that introduced 6973 // them. Needed for finding conflicting constructors. We also keep the 6974 // actually inserted declarations in there, for pretty diagnostics. 6975 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6976 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6977 ConstructorToSourceMap InheritedConstructors; 6978 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6979 BaseE = BasesToInheritFrom.end(); 6980 BaseIt != BaseE; ++BaseIt) { 6981 const RecordType *Base = *BaseIt; 6982 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6983 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6984 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6985 CtorE = BaseDecl->ctor_end(); 6986 CtorIt != CtorE; ++CtorIt) { 6987 // Find the using declaration for inheriting this base's constructors. 6988 DeclarationName Name = 6989 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6990 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 6991 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 6992 SourceLocation UsingLoc = UD ? UD->getLocation() : 6993 ClassDecl->getLocation(); 6994 6995 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6996 // from the class X named in the using-declaration consists of actual 6997 // constructors and notional constructors that result from the 6998 // transformation of defaulted parameters as follows: 6999 // - all non-template default constructors of X, and 7000 // - for each non-template constructor of X that has at least one 7001 // parameter with a default argument, the set of constructors that 7002 // results from omitting any ellipsis parameter specification and 7003 // successively omitting parameters with a default argument from the 7004 // end of the parameter-type-list. 7005 CXXConstructorDecl *BaseCtor = *CtorIt; 7006 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 7007 const FunctionProtoType *BaseCtorType = 7008 BaseCtor->getType()->getAs<FunctionProtoType>(); 7009 7010 for (unsigned params = BaseCtor->getMinRequiredArguments(), 7011 maxParams = BaseCtor->getNumParams(); 7012 params <= maxParams; ++params) { 7013 // Skip default constructors. They're never inherited. 7014 if (params == 0) 7015 continue; 7016 // Skip copy and move constructors for the same reason. 7017 if (CanBeCopyOrMove && params == 1) 7018 continue; 7019 7020 // Build up a function type for this particular constructor. 7021 // FIXME: The working paper does not consider that the exception spec 7022 // for the inheriting constructor might be larger than that of the 7023 // source. This code doesn't yet, either. When it does, this code will 7024 // need to be delayed until after exception specifications and in-class 7025 // member initializers are attached. 7026 const Type *NewCtorType; 7027 if (params == maxParams) 7028 NewCtorType = BaseCtorType; 7029 else { 7030 SmallVector<QualType, 16> Args; 7031 for (unsigned i = 0; i < params; ++i) { 7032 Args.push_back(BaseCtorType->getArgType(i)); 7033 } 7034 FunctionProtoType::ExtProtoInfo ExtInfo = 7035 BaseCtorType->getExtProtoInfo(); 7036 ExtInfo.Variadic = false; 7037 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7038 Args.data(), params, ExtInfo) 7039 .getTypePtr(); 7040 } 7041 const Type *CanonicalNewCtorType = 7042 Context.getCanonicalType(NewCtorType); 7043 7044 // Now that we have the type, first check if the class already has a 7045 // constructor with this signature. 7046 if (ExistingConstructors.count(CanonicalNewCtorType)) 7047 continue; 7048 7049 // Then we check if we have already declared an inherited constructor 7050 // with this signature. 7051 std::pair<ConstructorToSourceMap::iterator, bool> result = 7052 InheritedConstructors.insert(std::make_pair( 7053 CanonicalNewCtorType, 7054 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7055 if (!result.second) { 7056 // Already in the map. If it came from a different class, that's an 7057 // error. Not if it's from the same. 7058 CanQualType PreviousBase = result.first->second.first; 7059 if (CanonicalBase != PreviousBase) { 7060 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7061 const CXXConstructorDecl *PrevBaseCtor = 7062 PrevCtor->getInheritedConstructor(); 7063 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7064 7065 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7066 Diag(BaseCtor->getLocation(), 7067 diag::note_using_decl_constructor_conflict_current_ctor); 7068 Diag(PrevBaseCtor->getLocation(), 7069 diag::note_using_decl_constructor_conflict_previous_ctor); 7070 Diag(PrevCtor->getLocation(), 7071 diag::note_using_decl_constructor_conflict_previous_using); 7072 } 7073 continue; 7074 } 7075 7076 // OK, we're there, now add the constructor. 7077 // C++0x [class.inhctor]p8: [...] that would be performed by a 7078 // user-written inline constructor [...] 7079 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7080 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7081 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7082 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7083 /*ImplicitlyDeclared=*/true, 7084 // FIXME: Due to a defect in the standard, we treat inherited 7085 // constructors as constexpr even if that makes them ill-formed. 7086 /*Constexpr=*/BaseCtor->isConstexpr()); 7087 NewCtor->setAccess(BaseCtor->getAccess()); 7088 7089 // Build up the parameter decls and add them. 7090 SmallVector<ParmVarDecl *, 16> ParamDecls; 7091 for (unsigned i = 0; i < params; ++i) { 7092 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7093 UsingLoc, UsingLoc, 7094 /*IdentifierInfo=*/0, 7095 BaseCtorType->getArgType(i), 7096 /*TInfo=*/0, SC_None, 7097 SC_None, /*DefaultArg=*/0)); 7098 } 7099 NewCtor->setParams(ParamDecls); 7100 NewCtor->setInheritedConstructor(BaseCtor); 7101 7102 PushOnScopeChains(NewCtor, S, false); 7103 ClassDecl->addDecl(NewCtor); 7104 result.first->second.second = NewCtor; 7105 } 7106 } 7107 } 7108} 7109 7110Sema::ImplicitExceptionSpecification 7111Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7112 // C++ [except.spec]p14: 7113 // An implicitly declared special member function (Clause 12) shall have 7114 // an exception-specification. 7115 ImplicitExceptionSpecification ExceptSpec(Context); 7116 if (ClassDecl->isInvalidDecl()) 7117 return ExceptSpec; 7118 7119 // Direct base-class destructors. 7120 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7121 BEnd = ClassDecl->bases_end(); 7122 B != BEnd; ++B) { 7123 if (B->isVirtual()) // Handled below. 7124 continue; 7125 7126 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7127 ExceptSpec.CalledDecl( 7128 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7129 } 7130 7131 // Virtual base-class destructors. 7132 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7133 BEnd = ClassDecl->vbases_end(); 7134 B != BEnd; ++B) { 7135 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7136 ExceptSpec.CalledDecl( 7137 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7138 } 7139 7140 // Field destructors. 7141 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7142 FEnd = ClassDecl->field_end(); 7143 F != FEnd; ++F) { 7144 if (const RecordType *RecordTy 7145 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7146 ExceptSpec.CalledDecl( 7147 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7148 } 7149 7150 return ExceptSpec; 7151} 7152 7153CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7154 // C++ [class.dtor]p2: 7155 // If a class has no user-declared destructor, a destructor is 7156 // declared implicitly. An implicitly-declared destructor is an 7157 // inline public member of its class. 7158 7159 ImplicitExceptionSpecification Spec = 7160 ComputeDefaultedDtorExceptionSpec(ClassDecl); 7161 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7162 7163 // Create the actual destructor declaration. 7164 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 7165 7166 CanQualType ClassType 7167 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7168 SourceLocation ClassLoc = ClassDecl->getLocation(); 7169 DeclarationName Name 7170 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7171 DeclarationNameInfo NameInfo(Name, ClassLoc); 7172 CXXDestructorDecl *Destructor 7173 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 7174 /*isInline=*/true, 7175 /*isImplicitlyDeclared=*/true); 7176 Destructor->setAccess(AS_public); 7177 Destructor->setDefaulted(); 7178 Destructor->setImplicit(); 7179 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7180 7181 // Note that we have declared this destructor. 7182 ++ASTContext::NumImplicitDestructorsDeclared; 7183 7184 // Introduce this destructor into its scope. 7185 if (Scope *S = getScopeForContext(ClassDecl)) 7186 PushOnScopeChains(Destructor, S, false); 7187 ClassDecl->addDecl(Destructor); 7188 7189 // This could be uniqued if it ever proves significant. 7190 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 7191 7192 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 7193 Destructor->setDeletedAsWritten(); 7194 7195 AddOverriddenMethods(ClassDecl, Destructor); 7196 7197 return Destructor; 7198} 7199 7200void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7201 CXXDestructorDecl *Destructor) { 7202 assert((Destructor->isDefaulted() && 7203 !Destructor->doesThisDeclarationHaveABody()) && 7204 "DefineImplicitDestructor - call it for implicit default dtor"); 7205 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7206 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7207 7208 if (Destructor->isInvalidDecl()) 7209 return; 7210 7211 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7212 7213 DiagnosticErrorTrap Trap(Diags); 7214 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7215 Destructor->getParent()); 7216 7217 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7218 Diag(CurrentLocation, diag::note_member_synthesized_at) 7219 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7220 7221 Destructor->setInvalidDecl(); 7222 return; 7223 } 7224 7225 SourceLocation Loc = Destructor->getLocation(); 7226 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7227 Destructor->setImplicitlyDefined(true); 7228 Destructor->setUsed(); 7229 MarkVTableUsed(CurrentLocation, ClassDecl); 7230 7231 if (ASTMutationListener *L = getASTMutationListener()) { 7232 L->CompletedImplicitDefinition(Destructor); 7233 } 7234} 7235 7236void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 7237 CXXDestructorDecl *destructor) { 7238 // C++11 [class.dtor]p3: 7239 // A declaration of a destructor that does not have an exception- 7240 // specification is implicitly considered to have the same exception- 7241 // specification as an implicit declaration. 7242 const FunctionProtoType *dtorType = destructor->getType()-> 7243 getAs<FunctionProtoType>(); 7244 if (dtorType->hasExceptionSpec()) 7245 return; 7246 7247 ImplicitExceptionSpecification exceptSpec = 7248 ComputeDefaultedDtorExceptionSpec(classDecl); 7249 7250 // Replace the destructor's type, building off the existing one. Fortunately, 7251 // the only thing of interest in the destructor type is its extended info. 7252 // The return and arguments are fixed. 7253 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 7254 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 7255 epi.NumExceptions = exceptSpec.size(); 7256 epi.Exceptions = exceptSpec.data(); 7257 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 7258 7259 destructor->setType(ty); 7260 7261 // FIXME: If the destructor has a body that could throw, and the newly created 7262 // spec doesn't allow exceptions, we should emit a warning, because this 7263 // change in behavior can break conforming C++03 programs at runtime. 7264 // However, we don't have a body yet, so it needs to be done somewhere else. 7265} 7266 7267/// \brief Builds a statement that copies/moves the given entity from \p From to 7268/// \c To. 7269/// 7270/// This routine is used to copy/move the members of a class with an 7271/// implicitly-declared copy/move assignment operator. When the entities being 7272/// copied are arrays, this routine builds for loops to copy them. 7273/// 7274/// \param S The Sema object used for type-checking. 7275/// 7276/// \param Loc The location where the implicit copy/move is being generated. 7277/// 7278/// \param T The type of the expressions being copied/moved. Both expressions 7279/// must have this type. 7280/// 7281/// \param To The expression we are copying/moving to. 7282/// 7283/// \param From The expression we are copying/moving from. 7284/// 7285/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7286/// Otherwise, it's a non-static member subobject. 7287/// 7288/// \param Copying Whether we're copying or moving. 7289/// 7290/// \param Depth Internal parameter recording the depth of the recursion. 7291/// 7292/// \returns A statement or a loop that copies the expressions. 7293static StmtResult 7294BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7295 Expr *To, Expr *From, 7296 bool CopyingBaseSubobject, bool Copying, 7297 unsigned Depth = 0) { 7298 // C++0x [class.copy]p28: 7299 // Each subobject is assigned in the manner appropriate to its type: 7300 // 7301 // - if the subobject is of class type, as if by a call to operator= with 7302 // the subobject as the object expression and the corresponding 7303 // subobject of x as a single function argument (as if by explicit 7304 // qualification; that is, ignoring any possible virtual overriding 7305 // functions in more derived classes); 7306 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7307 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7308 7309 // Look for operator=. 7310 DeclarationName Name 7311 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7312 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7313 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7314 7315 // Filter out any result that isn't a copy/move-assignment operator. 7316 LookupResult::Filter F = OpLookup.makeFilter(); 7317 while (F.hasNext()) { 7318 NamedDecl *D = F.next(); 7319 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7320 if (Copying ? Method->isCopyAssignmentOperator() : 7321 Method->isMoveAssignmentOperator()) 7322 continue; 7323 7324 F.erase(); 7325 } 7326 F.done(); 7327 7328 // Suppress the protected check (C++ [class.protected]) for each of the 7329 // assignment operators we found. This strange dance is required when 7330 // we're assigning via a base classes's copy-assignment operator. To 7331 // ensure that we're getting the right base class subobject (without 7332 // ambiguities), we need to cast "this" to that subobject type; to 7333 // ensure that we don't go through the virtual call mechanism, we need 7334 // to qualify the operator= name with the base class (see below). However, 7335 // this means that if the base class has a protected copy assignment 7336 // operator, the protected member access check will fail. So, we 7337 // rewrite "protected" access to "public" access in this case, since we 7338 // know by construction that we're calling from a derived class. 7339 if (CopyingBaseSubobject) { 7340 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7341 L != LEnd; ++L) { 7342 if (L.getAccess() == AS_protected) 7343 L.setAccess(AS_public); 7344 } 7345 } 7346 7347 // Create the nested-name-specifier that will be used to qualify the 7348 // reference to operator=; this is required to suppress the virtual 7349 // call mechanism. 7350 CXXScopeSpec SS; 7351 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 7352 SS.MakeTrivial(S.Context, 7353 NestedNameSpecifier::Create(S.Context, 0, false, 7354 CanonicalT), 7355 Loc); 7356 7357 // Create the reference to operator=. 7358 ExprResult OpEqualRef 7359 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7360 /*TemplateKWLoc=*/SourceLocation(), 7361 /*FirstQualifierInScope=*/0, 7362 OpLookup, 7363 /*TemplateArgs=*/0, 7364 /*SuppressQualifierCheck=*/true); 7365 if (OpEqualRef.isInvalid()) 7366 return StmtError(); 7367 7368 // Build the call to the assignment operator. 7369 7370 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7371 OpEqualRef.takeAs<Expr>(), 7372 Loc, &From, 1, Loc); 7373 if (Call.isInvalid()) 7374 return StmtError(); 7375 7376 return S.Owned(Call.takeAs<Stmt>()); 7377 } 7378 7379 // - if the subobject is of scalar type, the built-in assignment 7380 // operator is used. 7381 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7382 if (!ArrayTy) { 7383 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7384 if (Assignment.isInvalid()) 7385 return StmtError(); 7386 7387 return S.Owned(Assignment.takeAs<Stmt>()); 7388 } 7389 7390 // - if the subobject is an array, each element is assigned, in the 7391 // manner appropriate to the element type; 7392 7393 // Construct a loop over the array bounds, e.g., 7394 // 7395 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7396 // 7397 // that will copy each of the array elements. 7398 QualType SizeType = S.Context.getSizeType(); 7399 7400 // Create the iteration variable. 7401 IdentifierInfo *IterationVarName = 0; 7402 { 7403 SmallString<8> Str; 7404 llvm::raw_svector_ostream OS(Str); 7405 OS << "__i" << Depth; 7406 IterationVarName = &S.Context.Idents.get(OS.str()); 7407 } 7408 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7409 IterationVarName, SizeType, 7410 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7411 SC_None, SC_None); 7412 7413 // Initialize the iteration variable to zero. 7414 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7415 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7416 7417 // Create a reference to the iteration variable; we'll use this several 7418 // times throughout. 7419 Expr *IterationVarRef 7420 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 7421 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7422 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 7423 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 7424 7425 // Create the DeclStmt that holds the iteration variable. 7426 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7427 7428 // Create the comparison against the array bound. 7429 llvm::APInt Upper 7430 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7431 Expr *Comparison 7432 = new (S.Context) BinaryOperator(IterationVarRefRVal, 7433 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7434 BO_NE, S.Context.BoolTy, 7435 VK_RValue, OK_Ordinary, Loc); 7436 7437 // Create the pre-increment of the iteration variable. 7438 Expr *Increment 7439 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7440 VK_LValue, OK_Ordinary, Loc); 7441 7442 // Subscript the "from" and "to" expressions with the iteration variable. 7443 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7444 IterationVarRefRVal, 7445 Loc)); 7446 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7447 IterationVarRefRVal, 7448 Loc)); 7449 if (!Copying) // Cast to rvalue 7450 From = CastForMoving(S, From); 7451 7452 // Build the copy/move for an individual element of the array. 7453 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7454 To, From, CopyingBaseSubobject, 7455 Copying, Depth + 1); 7456 if (Copy.isInvalid()) 7457 return StmtError(); 7458 7459 // Construct the loop that copies all elements of this array. 7460 return S.ActOnForStmt(Loc, Loc, InitStmt, 7461 S.MakeFullExpr(Comparison), 7462 0, S.MakeFullExpr(Increment), 7463 Loc, Copy.take()); 7464} 7465 7466std::pair<Sema::ImplicitExceptionSpecification, bool> 7467Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7468 CXXRecordDecl *ClassDecl) { 7469 if (ClassDecl->isInvalidDecl()) 7470 return std::make_pair(ImplicitExceptionSpecification(Context), false); 7471 7472 // C++ [class.copy]p10: 7473 // If the class definition does not explicitly declare a copy 7474 // assignment operator, one is declared implicitly. 7475 // The implicitly-defined copy assignment operator for a class X 7476 // will have the form 7477 // 7478 // X& X::operator=(const X&) 7479 // 7480 // if 7481 bool HasConstCopyAssignment = true; 7482 7483 // -- each direct base class B of X has a copy assignment operator 7484 // whose parameter is of type const B&, const volatile B& or B, 7485 // and 7486 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7487 BaseEnd = ClassDecl->bases_end(); 7488 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7489 // We'll handle this below 7490 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7491 continue; 7492 7493 assert(!Base->getType()->isDependentType() && 7494 "Cannot generate implicit members for class with dependent bases."); 7495 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7496 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7497 &HasConstCopyAssignment); 7498 } 7499 7500 // In C++11, the above citation has "or virtual" added 7501 if (LangOpts.CPlusPlus0x) { 7502 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7503 BaseEnd = ClassDecl->vbases_end(); 7504 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7505 assert(!Base->getType()->isDependentType() && 7506 "Cannot generate implicit members for class with dependent bases."); 7507 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7508 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7509 &HasConstCopyAssignment); 7510 } 7511 } 7512 7513 // -- for all the nonstatic data members of X that are of a class 7514 // type M (or array thereof), each such class type has a copy 7515 // assignment operator whose parameter is of type const M&, 7516 // const volatile M& or M. 7517 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7518 FieldEnd = ClassDecl->field_end(); 7519 HasConstCopyAssignment && Field != FieldEnd; 7520 ++Field) { 7521 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7522 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7523 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 7524 &HasConstCopyAssignment); 7525 } 7526 } 7527 7528 // Otherwise, the implicitly declared copy assignment operator will 7529 // have the form 7530 // 7531 // X& X::operator=(X&) 7532 7533 // C++ [except.spec]p14: 7534 // An implicitly declared special member function (Clause 12) shall have an 7535 // exception-specification. [...] 7536 7537 // It is unspecified whether or not an implicit copy assignment operator 7538 // attempts to deduplicate calls to assignment operators of virtual bases are 7539 // made. As such, this exception specification is effectively unspecified. 7540 // Based on a similar decision made for constness in C++0x, we're erring on 7541 // the side of assuming such calls to be made regardless of whether they 7542 // actually happen. 7543 ImplicitExceptionSpecification ExceptSpec(Context); 7544 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7545 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7546 BaseEnd = ClassDecl->bases_end(); 7547 Base != BaseEnd; ++Base) { 7548 if (Base->isVirtual()) 7549 continue; 7550 7551 CXXRecordDecl *BaseClassDecl 7552 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7553 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7554 ArgQuals, false, 0)) 7555 ExceptSpec.CalledDecl(CopyAssign); 7556 } 7557 7558 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7559 BaseEnd = ClassDecl->vbases_end(); 7560 Base != BaseEnd; ++Base) { 7561 CXXRecordDecl *BaseClassDecl 7562 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7563 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7564 ArgQuals, false, 0)) 7565 ExceptSpec.CalledDecl(CopyAssign); 7566 } 7567 7568 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7569 FieldEnd = ClassDecl->field_end(); 7570 Field != FieldEnd; 7571 ++Field) { 7572 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7573 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7574 if (CXXMethodDecl *CopyAssign = 7575 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7576 ExceptSpec.CalledDecl(CopyAssign); 7577 } 7578 } 7579 7580 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7581} 7582 7583CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7584 // Note: The following rules are largely analoguous to the copy 7585 // constructor rules. Note that virtual bases are not taken into account 7586 // for determining the argument type of the operator. Note also that 7587 // operators taking an object instead of a reference are allowed. 7588 7589 ImplicitExceptionSpecification Spec(Context); 7590 bool Const; 7591 llvm::tie(Spec, Const) = 7592 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7593 7594 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7595 QualType RetType = Context.getLValueReferenceType(ArgType); 7596 if (Const) 7597 ArgType = ArgType.withConst(); 7598 ArgType = Context.getLValueReferenceType(ArgType); 7599 7600 // An implicitly-declared copy assignment operator is an inline public 7601 // member of its class. 7602 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7603 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7604 SourceLocation ClassLoc = ClassDecl->getLocation(); 7605 DeclarationNameInfo NameInfo(Name, ClassLoc); 7606 CXXMethodDecl *CopyAssignment 7607 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7608 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7609 /*TInfo=*/0, /*isStatic=*/false, 7610 /*StorageClassAsWritten=*/SC_None, 7611 /*isInline=*/true, /*isConstexpr=*/false, 7612 SourceLocation()); 7613 CopyAssignment->setAccess(AS_public); 7614 CopyAssignment->setDefaulted(); 7615 CopyAssignment->setImplicit(); 7616 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7617 7618 // Add the parameter to the operator. 7619 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7620 ClassLoc, ClassLoc, /*Id=*/0, 7621 ArgType, /*TInfo=*/0, 7622 SC_None, 7623 SC_None, 0); 7624 CopyAssignment->setParams(FromParam); 7625 7626 // Note that we have added this copy-assignment operator. 7627 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7628 7629 if (Scope *S = getScopeForContext(ClassDecl)) 7630 PushOnScopeChains(CopyAssignment, S, false); 7631 ClassDecl->addDecl(CopyAssignment); 7632 7633 // C++0x [class.copy]p19: 7634 // .... If the class definition does not explicitly declare a copy 7635 // assignment operator, there is no user-declared move constructor, and 7636 // there is no user-declared move assignment operator, a copy assignment 7637 // operator is implicitly declared as defaulted. 7638 if ((ClassDecl->hasUserDeclaredMoveConstructor() && 7639 !getLangOptions().MicrosoftMode) || 7640 ClassDecl->hasUserDeclaredMoveAssignment() || 7641 ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 7642 CopyAssignment->setDeletedAsWritten(); 7643 7644 AddOverriddenMethods(ClassDecl, CopyAssignment); 7645 return CopyAssignment; 7646} 7647 7648void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7649 CXXMethodDecl *CopyAssignOperator) { 7650 assert((CopyAssignOperator->isDefaulted() && 7651 CopyAssignOperator->isOverloadedOperator() && 7652 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7653 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 7654 "DefineImplicitCopyAssignment called for wrong function"); 7655 7656 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7657 7658 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7659 CopyAssignOperator->setInvalidDecl(); 7660 return; 7661 } 7662 7663 CopyAssignOperator->setUsed(); 7664 7665 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7666 DiagnosticErrorTrap Trap(Diags); 7667 7668 // C++0x [class.copy]p30: 7669 // The implicitly-defined or explicitly-defaulted copy assignment operator 7670 // for a non-union class X performs memberwise copy assignment of its 7671 // subobjects. The direct base classes of X are assigned first, in the 7672 // order of their declaration in the base-specifier-list, and then the 7673 // immediate non-static data members of X are assigned, in the order in 7674 // which they were declared in the class definition. 7675 7676 // The statements that form the synthesized function body. 7677 ASTOwningVector<Stmt*> Statements(*this); 7678 7679 // The parameter for the "other" object, which we are copying from. 7680 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7681 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7682 QualType OtherRefType = Other->getType(); 7683 if (const LValueReferenceType *OtherRef 7684 = OtherRefType->getAs<LValueReferenceType>()) { 7685 OtherRefType = OtherRef->getPointeeType(); 7686 OtherQuals = OtherRefType.getQualifiers(); 7687 } 7688 7689 // Our location for everything implicitly-generated. 7690 SourceLocation Loc = CopyAssignOperator->getLocation(); 7691 7692 // Construct a reference to the "other" object. We'll be using this 7693 // throughout the generated ASTs. 7694 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7695 assert(OtherRef && "Reference to parameter cannot fail!"); 7696 7697 // Construct the "this" pointer. We'll be using this throughout the generated 7698 // ASTs. 7699 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7700 assert(This && "Reference to this cannot fail!"); 7701 7702 // Assign base classes. 7703 bool Invalid = false; 7704 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7705 E = ClassDecl->bases_end(); Base != E; ++Base) { 7706 // Form the assignment: 7707 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7708 QualType BaseType = Base->getType().getUnqualifiedType(); 7709 if (!BaseType->isRecordType()) { 7710 Invalid = true; 7711 continue; 7712 } 7713 7714 CXXCastPath BasePath; 7715 BasePath.push_back(Base); 7716 7717 // Construct the "from" expression, which is an implicit cast to the 7718 // appropriately-qualified base type. 7719 Expr *From = OtherRef; 7720 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7721 CK_UncheckedDerivedToBase, 7722 VK_LValue, &BasePath).take(); 7723 7724 // Dereference "this". 7725 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7726 7727 // Implicitly cast "this" to the appropriately-qualified base type. 7728 To = ImpCastExprToType(To.take(), 7729 Context.getCVRQualifiedType(BaseType, 7730 CopyAssignOperator->getTypeQualifiers()), 7731 CK_UncheckedDerivedToBase, 7732 VK_LValue, &BasePath); 7733 7734 // Build the copy. 7735 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7736 To.get(), From, 7737 /*CopyingBaseSubobject=*/true, 7738 /*Copying=*/true); 7739 if (Copy.isInvalid()) { 7740 Diag(CurrentLocation, diag::note_member_synthesized_at) 7741 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7742 CopyAssignOperator->setInvalidDecl(); 7743 return; 7744 } 7745 7746 // Success! Record the copy. 7747 Statements.push_back(Copy.takeAs<Expr>()); 7748 } 7749 7750 // \brief Reference to the __builtin_memcpy function. 7751 Expr *BuiltinMemCpyRef = 0; 7752 // \brief Reference to the __builtin_objc_memmove_collectable function. 7753 Expr *CollectableMemCpyRef = 0; 7754 7755 // Assign non-static members. 7756 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7757 FieldEnd = ClassDecl->field_end(); 7758 Field != FieldEnd; ++Field) { 7759 if (Field->isUnnamedBitfield()) 7760 continue; 7761 7762 // Check for members of reference type; we can't copy those. 7763 if (Field->getType()->isReferenceType()) { 7764 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7765 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7766 Diag(Field->getLocation(), diag::note_declared_at); 7767 Diag(CurrentLocation, diag::note_member_synthesized_at) 7768 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7769 Invalid = true; 7770 continue; 7771 } 7772 7773 // Check for members of const-qualified, non-class type. 7774 QualType BaseType = Context.getBaseElementType(Field->getType()); 7775 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7776 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7777 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7778 Diag(Field->getLocation(), diag::note_declared_at); 7779 Diag(CurrentLocation, diag::note_member_synthesized_at) 7780 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7781 Invalid = true; 7782 continue; 7783 } 7784 7785 // Suppress assigning zero-width bitfields. 7786 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7787 continue; 7788 7789 QualType FieldType = Field->getType().getNonReferenceType(); 7790 if (FieldType->isIncompleteArrayType()) { 7791 assert(ClassDecl->hasFlexibleArrayMember() && 7792 "Incomplete array type is not valid"); 7793 continue; 7794 } 7795 7796 // Build references to the field in the object we're copying from and to. 7797 CXXScopeSpec SS; // Intentionally empty 7798 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7799 LookupMemberName); 7800 MemberLookup.addDecl(*Field); 7801 MemberLookup.resolveKind(); 7802 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7803 Loc, /*IsArrow=*/false, 7804 SS, SourceLocation(), 0, 7805 MemberLookup, 0); 7806 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7807 Loc, /*IsArrow=*/true, 7808 SS, SourceLocation(), 0, 7809 MemberLookup, 0); 7810 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7811 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7812 7813 // If the field should be copied with __builtin_memcpy rather than via 7814 // explicit assignments, do so. This optimization only applies for arrays 7815 // of scalars and arrays of class type with trivial copy-assignment 7816 // operators. 7817 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7818 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7819 // Compute the size of the memory buffer to be copied. 7820 QualType SizeType = Context.getSizeType(); 7821 llvm::APInt Size(Context.getTypeSize(SizeType), 7822 Context.getTypeSizeInChars(BaseType).getQuantity()); 7823 for (const ConstantArrayType *Array 7824 = Context.getAsConstantArrayType(FieldType); 7825 Array; 7826 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7827 llvm::APInt ArraySize 7828 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7829 Size *= ArraySize; 7830 } 7831 7832 // Take the address of the field references for "from" and "to". 7833 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7834 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7835 7836 bool NeedsCollectableMemCpy = 7837 (BaseType->isRecordType() && 7838 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7839 7840 if (NeedsCollectableMemCpy) { 7841 if (!CollectableMemCpyRef) { 7842 // Create a reference to the __builtin_objc_memmove_collectable function. 7843 LookupResult R(*this, 7844 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7845 Loc, LookupOrdinaryName); 7846 LookupName(R, TUScope, true); 7847 7848 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7849 if (!CollectableMemCpy) { 7850 // Something went horribly wrong earlier, and we will have 7851 // complained about it. 7852 Invalid = true; 7853 continue; 7854 } 7855 7856 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7857 CollectableMemCpy->getType(), 7858 VK_LValue, Loc, 0).take(); 7859 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7860 } 7861 } 7862 // Create a reference to the __builtin_memcpy builtin function. 7863 else if (!BuiltinMemCpyRef) { 7864 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7865 LookupOrdinaryName); 7866 LookupName(R, TUScope, true); 7867 7868 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7869 if (!BuiltinMemCpy) { 7870 // Something went horribly wrong earlier, and we will have complained 7871 // about it. 7872 Invalid = true; 7873 continue; 7874 } 7875 7876 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7877 BuiltinMemCpy->getType(), 7878 VK_LValue, Loc, 0).take(); 7879 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7880 } 7881 7882 ASTOwningVector<Expr*> CallArgs(*this); 7883 CallArgs.push_back(To.takeAs<Expr>()); 7884 CallArgs.push_back(From.takeAs<Expr>()); 7885 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7886 ExprResult Call = ExprError(); 7887 if (NeedsCollectableMemCpy) 7888 Call = ActOnCallExpr(/*Scope=*/0, 7889 CollectableMemCpyRef, 7890 Loc, move_arg(CallArgs), 7891 Loc); 7892 else 7893 Call = ActOnCallExpr(/*Scope=*/0, 7894 BuiltinMemCpyRef, 7895 Loc, move_arg(CallArgs), 7896 Loc); 7897 7898 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7899 Statements.push_back(Call.takeAs<Expr>()); 7900 continue; 7901 } 7902 7903 // Build the copy of this field. 7904 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7905 To.get(), From.get(), 7906 /*CopyingBaseSubobject=*/false, 7907 /*Copying=*/true); 7908 if (Copy.isInvalid()) { 7909 Diag(CurrentLocation, diag::note_member_synthesized_at) 7910 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7911 CopyAssignOperator->setInvalidDecl(); 7912 return; 7913 } 7914 7915 // Success! Record the copy. 7916 Statements.push_back(Copy.takeAs<Stmt>()); 7917 } 7918 7919 if (!Invalid) { 7920 // Add a "return *this;" 7921 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7922 7923 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7924 if (Return.isInvalid()) 7925 Invalid = true; 7926 else { 7927 Statements.push_back(Return.takeAs<Stmt>()); 7928 7929 if (Trap.hasErrorOccurred()) { 7930 Diag(CurrentLocation, diag::note_member_synthesized_at) 7931 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7932 Invalid = true; 7933 } 7934 } 7935 } 7936 7937 if (Invalid) { 7938 CopyAssignOperator->setInvalidDecl(); 7939 return; 7940 } 7941 7942 StmtResult Body; 7943 { 7944 CompoundScopeRAII CompoundScope(*this); 7945 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7946 /*isStmtExpr=*/false); 7947 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7948 } 7949 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7950 7951 if (ASTMutationListener *L = getASTMutationListener()) { 7952 L->CompletedImplicitDefinition(CopyAssignOperator); 7953 } 7954} 7955 7956Sema::ImplicitExceptionSpecification 7957Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 7958 ImplicitExceptionSpecification ExceptSpec(Context); 7959 7960 if (ClassDecl->isInvalidDecl()) 7961 return ExceptSpec; 7962 7963 // C++0x [except.spec]p14: 7964 // An implicitly declared special member function (Clause 12) shall have an 7965 // exception-specification. [...] 7966 7967 // It is unspecified whether or not an implicit move assignment operator 7968 // attempts to deduplicate calls to assignment operators of virtual bases are 7969 // made. As such, this exception specification is effectively unspecified. 7970 // Based on a similar decision made for constness in C++0x, we're erring on 7971 // the side of assuming such calls to be made regardless of whether they 7972 // actually happen. 7973 // Note that a move constructor is not implicitly declared when there are 7974 // virtual bases, but it can still be user-declared and explicitly defaulted. 7975 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7976 BaseEnd = ClassDecl->bases_end(); 7977 Base != BaseEnd; ++Base) { 7978 if (Base->isVirtual()) 7979 continue; 7980 7981 CXXRecordDecl *BaseClassDecl 7982 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7983 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7984 false, 0)) 7985 ExceptSpec.CalledDecl(MoveAssign); 7986 } 7987 7988 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7989 BaseEnd = ClassDecl->vbases_end(); 7990 Base != BaseEnd; ++Base) { 7991 CXXRecordDecl *BaseClassDecl 7992 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7993 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7994 false, 0)) 7995 ExceptSpec.CalledDecl(MoveAssign); 7996 } 7997 7998 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7999 FieldEnd = ClassDecl->field_end(); 8000 Field != FieldEnd; 8001 ++Field) { 8002 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8003 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8004 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 8005 false, 0)) 8006 ExceptSpec.CalledDecl(MoveAssign); 8007 } 8008 } 8009 8010 return ExceptSpec; 8011} 8012 8013CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8014 // Note: The following rules are largely analoguous to the move 8015 // constructor rules. 8016 8017 ImplicitExceptionSpecification Spec( 8018 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 8019 8020 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8021 QualType RetType = Context.getLValueReferenceType(ArgType); 8022 ArgType = Context.getRValueReferenceType(ArgType); 8023 8024 // An implicitly-declared move assignment operator is an inline public 8025 // member of its class. 8026 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8027 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8028 SourceLocation ClassLoc = ClassDecl->getLocation(); 8029 DeclarationNameInfo NameInfo(Name, ClassLoc); 8030 CXXMethodDecl *MoveAssignment 8031 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8032 Context.getFunctionType(RetType, &ArgType, 1, EPI), 8033 /*TInfo=*/0, /*isStatic=*/false, 8034 /*StorageClassAsWritten=*/SC_None, 8035 /*isInline=*/true, 8036 /*isConstexpr=*/false, 8037 SourceLocation()); 8038 MoveAssignment->setAccess(AS_public); 8039 MoveAssignment->setDefaulted(); 8040 MoveAssignment->setImplicit(); 8041 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8042 8043 // Add the parameter to the operator. 8044 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8045 ClassLoc, ClassLoc, /*Id=*/0, 8046 ArgType, /*TInfo=*/0, 8047 SC_None, 8048 SC_None, 0); 8049 MoveAssignment->setParams(FromParam); 8050 8051 // Note that we have added this copy-assignment operator. 8052 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8053 8054 // C++0x [class.copy]p9: 8055 // If the definition of a class X does not explicitly declare a move 8056 // assignment operator, one will be implicitly declared as defaulted if and 8057 // only if: 8058 // [...] 8059 // - the move assignment operator would not be implicitly defined as 8060 // deleted. 8061 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 8062 // Cache this result so that we don't try to generate this over and over 8063 // on every lookup, leaking memory and wasting time. 8064 ClassDecl->setFailedImplicitMoveAssignment(); 8065 return 0; 8066 } 8067 8068 if (Scope *S = getScopeForContext(ClassDecl)) 8069 PushOnScopeChains(MoveAssignment, S, false); 8070 ClassDecl->addDecl(MoveAssignment); 8071 8072 AddOverriddenMethods(ClassDecl, MoveAssignment); 8073 return MoveAssignment; 8074} 8075 8076void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8077 CXXMethodDecl *MoveAssignOperator) { 8078 assert((MoveAssignOperator->isDefaulted() && 8079 MoveAssignOperator->isOverloadedOperator() && 8080 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8081 !MoveAssignOperator->doesThisDeclarationHaveABody()) && 8082 "DefineImplicitMoveAssignment called for wrong function"); 8083 8084 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8085 8086 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8087 MoveAssignOperator->setInvalidDecl(); 8088 return; 8089 } 8090 8091 MoveAssignOperator->setUsed(); 8092 8093 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8094 DiagnosticErrorTrap Trap(Diags); 8095 8096 // C++0x [class.copy]p28: 8097 // The implicitly-defined or move assignment operator for a non-union class 8098 // X performs memberwise move assignment of its subobjects. The direct base 8099 // classes of X are assigned first, in the order of their declaration in the 8100 // base-specifier-list, and then the immediate non-static data members of X 8101 // are assigned, in the order in which they were declared in the class 8102 // definition. 8103 8104 // The statements that form the synthesized function body. 8105 ASTOwningVector<Stmt*> Statements(*this); 8106 8107 // The parameter for the "other" object, which we are move from. 8108 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8109 QualType OtherRefType = Other->getType()-> 8110 getAs<RValueReferenceType>()->getPointeeType(); 8111 assert(OtherRefType.getQualifiers() == 0 && 8112 "Bad argument type of defaulted move assignment"); 8113 8114 // Our location for everything implicitly-generated. 8115 SourceLocation Loc = MoveAssignOperator->getLocation(); 8116 8117 // Construct a reference to the "other" object. We'll be using this 8118 // throughout the generated ASTs. 8119 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8120 assert(OtherRef && "Reference to parameter cannot fail!"); 8121 // Cast to rvalue. 8122 OtherRef = CastForMoving(*this, OtherRef); 8123 8124 // Construct the "this" pointer. We'll be using this throughout the generated 8125 // ASTs. 8126 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8127 assert(This && "Reference to this cannot fail!"); 8128 8129 // Assign base classes. 8130 bool Invalid = false; 8131 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8132 E = ClassDecl->bases_end(); Base != E; ++Base) { 8133 // Form the assignment: 8134 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8135 QualType BaseType = Base->getType().getUnqualifiedType(); 8136 if (!BaseType->isRecordType()) { 8137 Invalid = true; 8138 continue; 8139 } 8140 8141 CXXCastPath BasePath; 8142 BasePath.push_back(Base); 8143 8144 // Construct the "from" expression, which is an implicit cast to the 8145 // appropriately-qualified base type. 8146 Expr *From = OtherRef; 8147 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8148 VK_XValue, &BasePath).take(); 8149 8150 // Dereference "this". 8151 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8152 8153 // Implicitly cast "this" to the appropriately-qualified base type. 8154 To = ImpCastExprToType(To.take(), 8155 Context.getCVRQualifiedType(BaseType, 8156 MoveAssignOperator->getTypeQualifiers()), 8157 CK_UncheckedDerivedToBase, 8158 VK_LValue, &BasePath); 8159 8160 // Build the move. 8161 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8162 To.get(), From, 8163 /*CopyingBaseSubobject=*/true, 8164 /*Copying=*/false); 8165 if (Move.isInvalid()) { 8166 Diag(CurrentLocation, diag::note_member_synthesized_at) 8167 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8168 MoveAssignOperator->setInvalidDecl(); 8169 return; 8170 } 8171 8172 // Success! Record the move. 8173 Statements.push_back(Move.takeAs<Expr>()); 8174 } 8175 8176 // \brief Reference to the __builtin_memcpy function. 8177 Expr *BuiltinMemCpyRef = 0; 8178 // \brief Reference to the __builtin_objc_memmove_collectable function. 8179 Expr *CollectableMemCpyRef = 0; 8180 8181 // Assign non-static members. 8182 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8183 FieldEnd = ClassDecl->field_end(); 8184 Field != FieldEnd; ++Field) { 8185 if (Field->isUnnamedBitfield()) 8186 continue; 8187 8188 // Check for members of reference type; we can't move those. 8189 if (Field->getType()->isReferenceType()) { 8190 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8191 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8192 Diag(Field->getLocation(), diag::note_declared_at); 8193 Diag(CurrentLocation, diag::note_member_synthesized_at) 8194 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8195 Invalid = true; 8196 continue; 8197 } 8198 8199 // Check for members of const-qualified, non-class type. 8200 QualType BaseType = Context.getBaseElementType(Field->getType()); 8201 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8202 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8203 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8204 Diag(Field->getLocation(), diag::note_declared_at); 8205 Diag(CurrentLocation, diag::note_member_synthesized_at) 8206 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8207 Invalid = true; 8208 continue; 8209 } 8210 8211 // Suppress assigning zero-width bitfields. 8212 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8213 continue; 8214 8215 QualType FieldType = Field->getType().getNonReferenceType(); 8216 if (FieldType->isIncompleteArrayType()) { 8217 assert(ClassDecl->hasFlexibleArrayMember() && 8218 "Incomplete array type is not valid"); 8219 continue; 8220 } 8221 8222 // Build references to the field in the object we're copying from and to. 8223 CXXScopeSpec SS; // Intentionally empty 8224 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8225 LookupMemberName); 8226 MemberLookup.addDecl(*Field); 8227 MemberLookup.resolveKind(); 8228 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8229 Loc, /*IsArrow=*/false, 8230 SS, SourceLocation(), 0, 8231 MemberLookup, 0); 8232 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8233 Loc, /*IsArrow=*/true, 8234 SS, SourceLocation(), 0, 8235 MemberLookup, 0); 8236 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8237 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8238 8239 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8240 "Member reference with rvalue base must be rvalue except for reference " 8241 "members, which aren't allowed for move assignment."); 8242 8243 // If the field should be copied with __builtin_memcpy rather than via 8244 // explicit assignments, do so. This optimization only applies for arrays 8245 // of scalars and arrays of class type with trivial move-assignment 8246 // operators. 8247 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8248 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8249 // Compute the size of the memory buffer to be copied. 8250 QualType SizeType = Context.getSizeType(); 8251 llvm::APInt Size(Context.getTypeSize(SizeType), 8252 Context.getTypeSizeInChars(BaseType).getQuantity()); 8253 for (const ConstantArrayType *Array 8254 = Context.getAsConstantArrayType(FieldType); 8255 Array; 8256 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8257 llvm::APInt ArraySize 8258 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8259 Size *= ArraySize; 8260 } 8261 8262 // Take the address of the field references for "from" and "to". We 8263 // directly construct UnaryOperators here because semantic analysis 8264 // does not permit us to take the address of an xvalue. 8265 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8266 Context.getPointerType(From.get()->getType()), 8267 VK_RValue, OK_Ordinary, Loc); 8268 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8269 Context.getPointerType(To.get()->getType()), 8270 VK_RValue, OK_Ordinary, Loc); 8271 8272 bool NeedsCollectableMemCpy = 8273 (BaseType->isRecordType() && 8274 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8275 8276 if (NeedsCollectableMemCpy) { 8277 if (!CollectableMemCpyRef) { 8278 // Create a reference to the __builtin_objc_memmove_collectable function. 8279 LookupResult R(*this, 8280 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8281 Loc, LookupOrdinaryName); 8282 LookupName(R, TUScope, true); 8283 8284 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8285 if (!CollectableMemCpy) { 8286 // Something went horribly wrong earlier, and we will have 8287 // complained about it. 8288 Invalid = true; 8289 continue; 8290 } 8291 8292 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8293 CollectableMemCpy->getType(), 8294 VK_LValue, Loc, 0).take(); 8295 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8296 } 8297 } 8298 // Create a reference to the __builtin_memcpy builtin function. 8299 else if (!BuiltinMemCpyRef) { 8300 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8301 LookupOrdinaryName); 8302 LookupName(R, TUScope, true); 8303 8304 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8305 if (!BuiltinMemCpy) { 8306 // Something went horribly wrong earlier, and we will have complained 8307 // about it. 8308 Invalid = true; 8309 continue; 8310 } 8311 8312 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8313 BuiltinMemCpy->getType(), 8314 VK_LValue, Loc, 0).take(); 8315 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8316 } 8317 8318 ASTOwningVector<Expr*> CallArgs(*this); 8319 CallArgs.push_back(To.takeAs<Expr>()); 8320 CallArgs.push_back(From.takeAs<Expr>()); 8321 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8322 ExprResult Call = ExprError(); 8323 if (NeedsCollectableMemCpy) 8324 Call = ActOnCallExpr(/*Scope=*/0, 8325 CollectableMemCpyRef, 8326 Loc, move_arg(CallArgs), 8327 Loc); 8328 else 8329 Call = ActOnCallExpr(/*Scope=*/0, 8330 BuiltinMemCpyRef, 8331 Loc, move_arg(CallArgs), 8332 Loc); 8333 8334 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8335 Statements.push_back(Call.takeAs<Expr>()); 8336 continue; 8337 } 8338 8339 // Build the move of this field. 8340 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8341 To.get(), From.get(), 8342 /*CopyingBaseSubobject=*/false, 8343 /*Copying=*/false); 8344 if (Move.isInvalid()) { 8345 Diag(CurrentLocation, diag::note_member_synthesized_at) 8346 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8347 MoveAssignOperator->setInvalidDecl(); 8348 return; 8349 } 8350 8351 // Success! Record the copy. 8352 Statements.push_back(Move.takeAs<Stmt>()); 8353 } 8354 8355 if (!Invalid) { 8356 // Add a "return *this;" 8357 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8358 8359 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8360 if (Return.isInvalid()) 8361 Invalid = true; 8362 else { 8363 Statements.push_back(Return.takeAs<Stmt>()); 8364 8365 if (Trap.hasErrorOccurred()) { 8366 Diag(CurrentLocation, diag::note_member_synthesized_at) 8367 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8368 Invalid = true; 8369 } 8370 } 8371 } 8372 8373 if (Invalid) { 8374 MoveAssignOperator->setInvalidDecl(); 8375 return; 8376 } 8377 8378 StmtResult Body; 8379 { 8380 CompoundScopeRAII CompoundScope(*this); 8381 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8382 /*isStmtExpr=*/false); 8383 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8384 } 8385 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8386 8387 if (ASTMutationListener *L = getASTMutationListener()) { 8388 L->CompletedImplicitDefinition(MoveAssignOperator); 8389 } 8390} 8391 8392std::pair<Sema::ImplicitExceptionSpecification, bool> 8393Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8394 if (ClassDecl->isInvalidDecl()) 8395 return std::make_pair(ImplicitExceptionSpecification(Context), false); 8396 8397 // C++ [class.copy]p5: 8398 // The implicitly-declared copy constructor for a class X will 8399 // have the form 8400 // 8401 // X::X(const X&) 8402 // 8403 // if 8404 // FIXME: It ought to be possible to store this on the record. 8405 bool HasConstCopyConstructor = true; 8406 8407 // -- each direct or virtual base class B of X has a copy 8408 // constructor whose first parameter is of type const B& or 8409 // const volatile B&, and 8410 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8411 BaseEnd = ClassDecl->bases_end(); 8412 HasConstCopyConstructor && Base != BaseEnd; 8413 ++Base) { 8414 // Virtual bases are handled below. 8415 if (Base->isVirtual()) 8416 continue; 8417 8418 CXXRecordDecl *BaseClassDecl 8419 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8420 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8421 &HasConstCopyConstructor); 8422 } 8423 8424 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8425 BaseEnd = ClassDecl->vbases_end(); 8426 HasConstCopyConstructor && Base != BaseEnd; 8427 ++Base) { 8428 CXXRecordDecl *BaseClassDecl 8429 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8430 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8431 &HasConstCopyConstructor); 8432 } 8433 8434 // -- for all the nonstatic data members of X that are of a 8435 // class type M (or array thereof), each such class type 8436 // has a copy constructor whose first parameter is of type 8437 // const M& or const volatile M&. 8438 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8439 FieldEnd = ClassDecl->field_end(); 8440 HasConstCopyConstructor && Field != FieldEnd; 8441 ++Field) { 8442 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8443 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8444 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 8445 &HasConstCopyConstructor); 8446 } 8447 } 8448 // Otherwise, the implicitly declared copy constructor will have 8449 // the form 8450 // 8451 // X::X(X&) 8452 8453 // C++ [except.spec]p14: 8454 // An implicitly declared special member function (Clause 12) shall have an 8455 // exception-specification. [...] 8456 ImplicitExceptionSpecification ExceptSpec(Context); 8457 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8458 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8459 BaseEnd = ClassDecl->bases_end(); 8460 Base != BaseEnd; 8461 ++Base) { 8462 // Virtual bases are handled below. 8463 if (Base->isVirtual()) 8464 continue; 8465 8466 CXXRecordDecl *BaseClassDecl 8467 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8468 if (CXXConstructorDecl *CopyConstructor = 8469 LookupCopyingConstructor(BaseClassDecl, Quals)) 8470 ExceptSpec.CalledDecl(CopyConstructor); 8471 } 8472 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8473 BaseEnd = ClassDecl->vbases_end(); 8474 Base != BaseEnd; 8475 ++Base) { 8476 CXXRecordDecl *BaseClassDecl 8477 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8478 if (CXXConstructorDecl *CopyConstructor = 8479 LookupCopyingConstructor(BaseClassDecl, Quals)) 8480 ExceptSpec.CalledDecl(CopyConstructor); 8481 } 8482 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8483 FieldEnd = ClassDecl->field_end(); 8484 Field != FieldEnd; 8485 ++Field) { 8486 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8487 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8488 if (CXXConstructorDecl *CopyConstructor = 8489 LookupCopyingConstructor(FieldClassDecl, Quals)) 8490 ExceptSpec.CalledDecl(CopyConstructor); 8491 } 8492 } 8493 8494 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8495} 8496 8497CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8498 CXXRecordDecl *ClassDecl) { 8499 // C++ [class.copy]p4: 8500 // If the class definition does not explicitly declare a copy 8501 // constructor, one is declared implicitly. 8502 8503 ImplicitExceptionSpecification Spec(Context); 8504 bool Const; 8505 llvm::tie(Spec, Const) = 8506 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8507 8508 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8509 QualType ArgType = ClassType; 8510 if (Const) 8511 ArgType = ArgType.withConst(); 8512 ArgType = Context.getLValueReferenceType(ArgType); 8513 8514 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8515 8516 DeclarationName Name 8517 = Context.DeclarationNames.getCXXConstructorName( 8518 Context.getCanonicalType(ClassType)); 8519 SourceLocation ClassLoc = ClassDecl->getLocation(); 8520 DeclarationNameInfo NameInfo(Name, ClassLoc); 8521 8522 // An implicitly-declared copy constructor is an inline public 8523 // member of its class. 8524 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8525 Context, ClassDecl, ClassLoc, NameInfo, 8526 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8527 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8528 /*isConstexpr=*/ClassDecl->defaultedCopyConstructorIsConstexpr() && 8529 getLangOptions().CPlusPlus0x); 8530 CopyConstructor->setAccess(AS_public); 8531 CopyConstructor->setDefaulted(); 8532 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8533 8534 // Note that we have declared this constructor. 8535 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8536 8537 // Add the parameter to the constructor. 8538 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8539 ClassLoc, ClassLoc, 8540 /*IdentifierInfo=*/0, 8541 ArgType, /*TInfo=*/0, 8542 SC_None, 8543 SC_None, 0); 8544 CopyConstructor->setParams(FromParam); 8545 8546 if (Scope *S = getScopeForContext(ClassDecl)) 8547 PushOnScopeChains(CopyConstructor, S, false); 8548 ClassDecl->addDecl(CopyConstructor); 8549 8550 // C++11 [class.copy]p8: 8551 // ... If the class definition does not explicitly declare a copy 8552 // constructor, there is no user-declared move constructor, and there is no 8553 // user-declared move assignment operator, a copy constructor is implicitly 8554 // declared as defaulted. 8555 if (ClassDecl->hasUserDeclaredMoveConstructor() || 8556 (ClassDecl->hasUserDeclaredMoveAssignment() && 8557 !getLangOptions().MicrosoftMode) || 8558 ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8559 CopyConstructor->setDeletedAsWritten(); 8560 8561 return CopyConstructor; 8562} 8563 8564void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8565 CXXConstructorDecl *CopyConstructor) { 8566 assert((CopyConstructor->isDefaulted() && 8567 CopyConstructor->isCopyConstructor() && 8568 !CopyConstructor->doesThisDeclarationHaveABody()) && 8569 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8570 8571 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8572 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8573 8574 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8575 DiagnosticErrorTrap Trap(Diags); 8576 8577 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8578 Trap.hasErrorOccurred()) { 8579 Diag(CurrentLocation, diag::note_member_synthesized_at) 8580 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8581 CopyConstructor->setInvalidDecl(); 8582 } else { 8583 Sema::CompoundScopeRAII CompoundScope(*this); 8584 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8585 CopyConstructor->getLocation(), 8586 MultiStmtArg(*this, 0, 0), 8587 /*isStmtExpr=*/false) 8588 .takeAs<Stmt>()); 8589 CopyConstructor->setImplicitlyDefined(true); 8590 } 8591 8592 CopyConstructor->setUsed(); 8593 if (ASTMutationListener *L = getASTMutationListener()) { 8594 L->CompletedImplicitDefinition(CopyConstructor); 8595 } 8596} 8597 8598Sema::ImplicitExceptionSpecification 8599Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8600 // C++ [except.spec]p14: 8601 // An implicitly declared special member function (Clause 12) shall have an 8602 // exception-specification. [...] 8603 ImplicitExceptionSpecification ExceptSpec(Context); 8604 if (ClassDecl->isInvalidDecl()) 8605 return ExceptSpec; 8606 8607 // Direct base-class constructors. 8608 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8609 BEnd = ClassDecl->bases_end(); 8610 B != BEnd; ++B) { 8611 if (B->isVirtual()) // Handled below. 8612 continue; 8613 8614 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8615 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8616 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8617 // If this is a deleted function, add it anyway. This might be conformant 8618 // with the standard. This might not. I'm not sure. It might not matter. 8619 if (Constructor) 8620 ExceptSpec.CalledDecl(Constructor); 8621 } 8622 } 8623 8624 // Virtual base-class constructors. 8625 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8626 BEnd = ClassDecl->vbases_end(); 8627 B != BEnd; ++B) { 8628 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8629 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8630 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8631 // If this is a deleted function, add it anyway. This might be conformant 8632 // with the standard. This might not. I'm not sure. It might not matter. 8633 if (Constructor) 8634 ExceptSpec.CalledDecl(Constructor); 8635 } 8636 } 8637 8638 // Field constructors. 8639 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8640 FEnd = ClassDecl->field_end(); 8641 F != FEnd; ++F) { 8642 if (const RecordType *RecordTy 8643 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8644 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8645 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8646 // If this is a deleted function, add it anyway. This might be conformant 8647 // with the standard. This might not. I'm not sure. It might not matter. 8648 // In particular, the problem is that this function never gets called. It 8649 // might just be ill-formed because this function attempts to refer to 8650 // a deleted function here. 8651 if (Constructor) 8652 ExceptSpec.CalledDecl(Constructor); 8653 } 8654 } 8655 8656 return ExceptSpec; 8657} 8658 8659CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8660 CXXRecordDecl *ClassDecl) { 8661 ImplicitExceptionSpecification Spec( 8662 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8663 8664 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8665 QualType ArgType = Context.getRValueReferenceType(ClassType); 8666 8667 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8668 8669 DeclarationName Name 8670 = Context.DeclarationNames.getCXXConstructorName( 8671 Context.getCanonicalType(ClassType)); 8672 SourceLocation ClassLoc = ClassDecl->getLocation(); 8673 DeclarationNameInfo NameInfo(Name, ClassLoc); 8674 8675 // C++0x [class.copy]p11: 8676 // An implicitly-declared copy/move constructor is an inline public 8677 // member of its class. 8678 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8679 Context, ClassDecl, ClassLoc, NameInfo, 8680 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8681 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8682 /*isConstexpr=*/ClassDecl->defaultedMoveConstructorIsConstexpr() && 8683 getLangOptions().CPlusPlus0x); 8684 MoveConstructor->setAccess(AS_public); 8685 MoveConstructor->setDefaulted(); 8686 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8687 8688 // Add the parameter to the constructor. 8689 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8690 ClassLoc, ClassLoc, 8691 /*IdentifierInfo=*/0, 8692 ArgType, /*TInfo=*/0, 8693 SC_None, 8694 SC_None, 0); 8695 MoveConstructor->setParams(FromParam); 8696 8697 // C++0x [class.copy]p9: 8698 // If the definition of a class X does not explicitly declare a move 8699 // constructor, one will be implicitly declared as defaulted if and only if: 8700 // [...] 8701 // - the move constructor would not be implicitly defined as deleted. 8702 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8703 // Cache this result so that we don't try to generate this over and over 8704 // on every lookup, leaking memory and wasting time. 8705 ClassDecl->setFailedImplicitMoveConstructor(); 8706 return 0; 8707 } 8708 8709 // Note that we have declared this constructor. 8710 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8711 8712 if (Scope *S = getScopeForContext(ClassDecl)) 8713 PushOnScopeChains(MoveConstructor, S, false); 8714 ClassDecl->addDecl(MoveConstructor); 8715 8716 return MoveConstructor; 8717} 8718 8719void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8720 CXXConstructorDecl *MoveConstructor) { 8721 assert((MoveConstructor->isDefaulted() && 8722 MoveConstructor->isMoveConstructor() && 8723 !MoveConstructor->doesThisDeclarationHaveABody()) && 8724 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8725 8726 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8727 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8728 8729 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8730 DiagnosticErrorTrap Trap(Diags); 8731 8732 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8733 Trap.hasErrorOccurred()) { 8734 Diag(CurrentLocation, diag::note_member_synthesized_at) 8735 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8736 MoveConstructor->setInvalidDecl(); 8737 } else { 8738 Sema::CompoundScopeRAII CompoundScope(*this); 8739 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8740 MoveConstructor->getLocation(), 8741 MultiStmtArg(*this, 0, 0), 8742 /*isStmtExpr=*/false) 8743 .takeAs<Stmt>()); 8744 MoveConstructor->setImplicitlyDefined(true); 8745 } 8746 8747 MoveConstructor->setUsed(); 8748 8749 if (ASTMutationListener *L = getASTMutationListener()) { 8750 L->CompletedImplicitDefinition(MoveConstructor); 8751 } 8752} 8753 8754bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 8755 return FD->isDeleted() && 8756 (FD->isDefaulted() || FD->isImplicit()) && 8757 isa<CXXMethodDecl>(FD); 8758} 8759 8760/// \brief Mark the call operator of the given lambda closure type as "used". 8761static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 8762 CXXMethodDecl *CallOperator 8763 = cast<CXXMethodDecl>( 8764 *Lambda->lookup( 8765 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).first); 8766 CallOperator->setReferenced(); 8767 CallOperator->setUsed(); 8768} 8769 8770void Sema::DefineImplicitLambdaToFunctionPointerConversion( 8771 SourceLocation CurrentLocation, 8772 CXXConversionDecl *Conv) 8773{ 8774 CXXRecordDecl *Lambda = Conv->getParent(); 8775 8776 // Make sure that the lambda call operator is marked used. 8777 markLambdaCallOperatorUsed(*this, Lambda); 8778 8779 Conv->setUsed(); 8780 8781 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8782 DiagnosticErrorTrap Trap(Diags); 8783 8784 // Return the address of the __invoke function. 8785 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 8786 CXXMethodDecl *Invoke 8787 = cast<CXXMethodDecl>(*Lambda->lookup(InvokeName).first); 8788 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 8789 VK_LValue, Conv->getLocation()).take(); 8790 assert(FunctionRef && "Can't refer to __invoke function?"); 8791 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 8792 Conv->setBody(new (Context) CompoundStmt(Context, &Return, 1, 8793 Conv->getLocation(), 8794 Conv->getLocation())); 8795 8796 // Fill in the __invoke function with a dummy implementation. IR generation 8797 // will fill in the actual details. 8798 Invoke->setUsed(); 8799 Invoke->setReferenced(); 8800 Invoke->setBody(new (Context) CompoundStmt(Context, 0, 0, Conv->getLocation(), 8801 Conv->getLocation())); 8802 8803 if (ASTMutationListener *L = getASTMutationListener()) { 8804 L->CompletedImplicitDefinition(Conv); 8805 L->CompletedImplicitDefinition(Invoke); 8806 } 8807} 8808 8809void Sema::DefineImplicitLambdaToBlockPointerConversion( 8810 SourceLocation CurrentLocation, 8811 CXXConversionDecl *Conv) 8812{ 8813 CXXRecordDecl *Lambda = Conv->getParent(); 8814 8815 // Make sure that the lambda call operator is marked used. 8816 CXXMethodDecl *CallOperator 8817 = cast<CXXMethodDecl>( 8818 *Lambda->lookup( 8819 Context.DeclarationNames.getCXXOperatorName(OO_Call)).first); 8820 CallOperator->setReferenced(); 8821 CallOperator->setUsed(); 8822 Conv->setUsed(); 8823 8824 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8825 DiagnosticErrorTrap Trap(Diags); 8826 8827 // Copy-initialize the lambda object as needed to capture it. 8828 Expr *This = ActOnCXXThis(CurrentLocation).take(); 8829 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 8830 ExprResult Init = PerformCopyInitialization( 8831 InitializedEntity::InitializeBlock(CurrentLocation, 8832 DerefThis->getType(), 8833 /*NRVO=*/false), 8834 CurrentLocation, DerefThis); 8835 if (!Init.isInvalid()) 8836 Init = ActOnFinishFullExpr(Init.take()); 8837 8838 if (Init.isInvalid()) { 8839 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 8840 Conv->setInvalidDecl(); 8841 return; 8842 } 8843 8844 // Create the new block to be returned. 8845 BlockDecl *Block = BlockDecl::Create(Context, Conv, Conv->getLocation()); 8846 8847 // Set the type information. 8848 Block->setSignatureAsWritten(CallOperator->getTypeSourceInfo()); 8849 Block->setIsVariadic(CallOperator->isVariadic()); 8850 Block->setBlockMissingReturnType(false); 8851 8852 // Add parameters. 8853 SmallVector<ParmVarDecl *, 4> BlockParams; 8854 for (unsigned I = 0, N = CallOperator->getNumParams(); I != N; ++I) { 8855 ParmVarDecl *From = CallOperator->getParamDecl(I); 8856 BlockParams.push_back(ParmVarDecl::Create(Context, Block, 8857 From->getLocStart(), 8858 From->getLocation(), 8859 From->getIdentifier(), 8860 From->getType(), 8861 From->getTypeSourceInfo(), 8862 From->getStorageClass(), 8863 From->getStorageClassAsWritten(), 8864 /*DefaultArg=*/0)); 8865 } 8866 Block->setParams(BlockParams); 8867 8868 // Add capture. The capture is uses a fake (NULL) variable, since we don't 8869 // actually want to have to name a capture variable. However, the 8870 // initializer copy-initializes the lambda object. 8871 BlockDecl::Capture Capture(/*Variable=*/0, /*ByRef=*/false, /*Nested=*/false, 8872 /*Copy=*/Init.take()); 8873 Block->setCaptures(Context, &Capture, &Capture + 1, 8874 /*CapturesCXXThis=*/false); 8875 8876 // Add a fake function body to the block. IR generation is responsible 8877 // for filling in the actual body, which cannot be expressed as an AST. 8878 Block->setBody(new (Context) CompoundStmt(Context, 0, 0, 8879 Conv->getLocation(), 8880 Conv->getLocation())); 8881 8882 // Create the block literal expression. 8883 Expr *BuildBlock = new (Context) BlockExpr(Block, Conv->getConversionType()); 8884 ExprCleanupObjects.push_back(Block); 8885 ExprNeedsCleanups = true; 8886 8887 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 8888 // behavior. 8889 if (!getLangOptions().ObjCAutoRefCount) 8890 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock->getType(), 8891 CK_CopyAndAutoreleaseBlockObject, 8892 BuildBlock, 0, VK_RValue); 8893 8894 // Create the return statement that returns the block from the conversion 8895 // function. 8896 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock); 8897 if (Return.isInvalid()) { 8898 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 8899 Conv->setInvalidDecl(); 8900 return; 8901 } 8902 8903 // Set the body of the conversion function. 8904 Stmt *ReturnS = Return.take(); 8905 Conv->setBody(new (Context) CompoundStmt(Context, &ReturnS, 1, 8906 Conv->getLocation(), 8907 Conv->getLocation())); 8908 8909 // We're done; notify the mutation listener, if any. 8910 if (ASTMutationListener *L = getASTMutationListener()) { 8911 L->CompletedImplicitDefinition(Conv); 8912 } 8913} 8914 8915ExprResult 8916Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8917 CXXConstructorDecl *Constructor, 8918 MultiExprArg ExprArgs, 8919 bool HadMultipleCandidates, 8920 bool RequiresZeroInit, 8921 unsigned ConstructKind, 8922 SourceRange ParenRange) { 8923 bool Elidable = false; 8924 8925 // C++0x [class.copy]p34: 8926 // When certain criteria are met, an implementation is allowed to 8927 // omit the copy/move construction of a class object, even if the 8928 // copy/move constructor and/or destructor for the object have 8929 // side effects. [...] 8930 // - when a temporary class object that has not been bound to a 8931 // reference (12.2) would be copied/moved to a class object 8932 // with the same cv-unqualified type, the copy/move operation 8933 // can be omitted by constructing the temporary object 8934 // directly into the target of the omitted copy/move 8935 if (ConstructKind == CXXConstructExpr::CK_Complete && 8936 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 8937 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 8938 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 8939 } 8940 8941 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 8942 Elidable, move(ExprArgs), HadMultipleCandidates, 8943 RequiresZeroInit, ConstructKind, ParenRange); 8944} 8945 8946/// BuildCXXConstructExpr - Creates a complete call to a constructor, 8947/// including handling of its default argument expressions. 8948ExprResult 8949Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8950 CXXConstructorDecl *Constructor, bool Elidable, 8951 MultiExprArg ExprArgs, 8952 bool HadMultipleCandidates, 8953 bool RequiresZeroInit, 8954 unsigned ConstructKind, 8955 SourceRange ParenRange) { 8956 unsigned NumExprs = ExprArgs.size(); 8957 Expr **Exprs = (Expr **)ExprArgs.release(); 8958 8959 for (specific_attr_iterator<NonNullAttr> 8960 i = Constructor->specific_attr_begin<NonNullAttr>(), 8961 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 8962 const NonNullAttr *NonNull = *i; 8963 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 8964 } 8965 8966 MarkFunctionReferenced(ConstructLoc, Constructor); 8967 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 8968 Constructor, Elidable, Exprs, NumExprs, 8969 HadMultipleCandidates, /*FIXME*/false, 8970 RequiresZeroInit, 8971 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 8972 ParenRange)); 8973} 8974 8975bool Sema::InitializeVarWithConstructor(VarDecl *VD, 8976 CXXConstructorDecl *Constructor, 8977 MultiExprArg Exprs, 8978 bool HadMultipleCandidates) { 8979 // FIXME: Provide the correct paren SourceRange when available. 8980 ExprResult TempResult = 8981 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 8982 move(Exprs), HadMultipleCandidates, false, 8983 CXXConstructExpr::CK_Complete, SourceRange()); 8984 if (TempResult.isInvalid()) 8985 return true; 8986 8987 Expr *Temp = TempResult.takeAs<Expr>(); 8988 CheckImplicitConversions(Temp, VD->getLocation()); 8989 MarkFunctionReferenced(VD->getLocation(), Constructor); 8990 Temp = MaybeCreateExprWithCleanups(Temp); 8991 VD->setInit(Temp); 8992 8993 return false; 8994} 8995 8996void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 8997 if (VD->isInvalidDecl()) return; 8998 8999 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9000 if (ClassDecl->isInvalidDecl()) return; 9001 if (ClassDecl->hasIrrelevantDestructor()) return; 9002 if (ClassDecl->isDependentContext()) return; 9003 9004 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9005 MarkFunctionReferenced(VD->getLocation(), Destructor); 9006 CheckDestructorAccess(VD->getLocation(), Destructor, 9007 PDiag(diag::err_access_dtor_var) 9008 << VD->getDeclName() 9009 << VD->getType()); 9010 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 9011 9012 if (!VD->hasGlobalStorage()) return; 9013 9014 // Emit warning for non-trivial dtor in global scope (a real global, 9015 // class-static, function-static). 9016 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9017 9018 // TODO: this should be re-enabled for static locals by !CXAAtExit 9019 if (!VD->isStaticLocal()) 9020 Diag(VD->getLocation(), diag::warn_global_destructor); 9021} 9022 9023/// \brief Given a constructor and the set of arguments provided for the 9024/// constructor, convert the arguments and add any required default arguments 9025/// to form a proper call to this constructor. 9026/// 9027/// \returns true if an error occurred, false otherwise. 9028bool 9029Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9030 MultiExprArg ArgsPtr, 9031 SourceLocation Loc, 9032 ASTOwningVector<Expr*> &ConvertedArgs) { 9033 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9034 unsigned NumArgs = ArgsPtr.size(); 9035 Expr **Args = (Expr **)ArgsPtr.get(); 9036 9037 const FunctionProtoType *Proto 9038 = Constructor->getType()->getAs<FunctionProtoType>(); 9039 assert(Proto && "Constructor without a prototype?"); 9040 unsigned NumArgsInProto = Proto->getNumArgs(); 9041 9042 // If too few arguments are available, we'll fill in the rest with defaults. 9043 if (NumArgs < NumArgsInProto) 9044 ConvertedArgs.reserve(NumArgsInProto); 9045 else 9046 ConvertedArgs.reserve(NumArgs); 9047 9048 VariadicCallType CallType = 9049 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9050 SmallVector<Expr *, 8> AllArgs; 9051 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9052 Proto, 0, Args, NumArgs, AllArgs, 9053 CallType); 9054 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 9055 9056 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size()); 9057 9058 // FIXME: Missing call to CheckFunctionCall or equivalent 9059 9060 return Invalid; 9061} 9062 9063static inline bool 9064CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9065 const FunctionDecl *FnDecl) { 9066 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9067 if (isa<NamespaceDecl>(DC)) { 9068 return SemaRef.Diag(FnDecl->getLocation(), 9069 diag::err_operator_new_delete_declared_in_namespace) 9070 << FnDecl->getDeclName(); 9071 } 9072 9073 if (isa<TranslationUnitDecl>(DC) && 9074 FnDecl->getStorageClass() == SC_Static) { 9075 return SemaRef.Diag(FnDecl->getLocation(), 9076 diag::err_operator_new_delete_declared_static) 9077 << FnDecl->getDeclName(); 9078 } 9079 9080 return false; 9081} 9082 9083static inline bool 9084CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9085 CanQualType ExpectedResultType, 9086 CanQualType ExpectedFirstParamType, 9087 unsigned DependentParamTypeDiag, 9088 unsigned InvalidParamTypeDiag) { 9089 QualType ResultType = 9090 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9091 9092 // Check that the result type is not dependent. 9093 if (ResultType->isDependentType()) 9094 return SemaRef.Diag(FnDecl->getLocation(), 9095 diag::err_operator_new_delete_dependent_result_type) 9096 << FnDecl->getDeclName() << ExpectedResultType; 9097 9098 // Check that the result type is what we expect. 9099 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9100 return SemaRef.Diag(FnDecl->getLocation(), 9101 diag::err_operator_new_delete_invalid_result_type) 9102 << FnDecl->getDeclName() << ExpectedResultType; 9103 9104 // A function template must have at least 2 parameters. 9105 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9106 return SemaRef.Diag(FnDecl->getLocation(), 9107 diag::err_operator_new_delete_template_too_few_parameters) 9108 << FnDecl->getDeclName(); 9109 9110 // The function decl must have at least 1 parameter. 9111 if (FnDecl->getNumParams() == 0) 9112 return SemaRef.Diag(FnDecl->getLocation(), 9113 diag::err_operator_new_delete_too_few_parameters) 9114 << FnDecl->getDeclName(); 9115 9116 // Check the the first parameter type is not dependent. 9117 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9118 if (FirstParamType->isDependentType()) 9119 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9120 << FnDecl->getDeclName() << ExpectedFirstParamType; 9121 9122 // Check that the first parameter type is what we expect. 9123 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9124 ExpectedFirstParamType) 9125 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9126 << FnDecl->getDeclName() << ExpectedFirstParamType; 9127 9128 return false; 9129} 9130 9131static bool 9132CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9133 // C++ [basic.stc.dynamic.allocation]p1: 9134 // A program is ill-formed if an allocation function is declared in a 9135 // namespace scope other than global scope or declared static in global 9136 // scope. 9137 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9138 return true; 9139 9140 CanQualType SizeTy = 9141 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9142 9143 // C++ [basic.stc.dynamic.allocation]p1: 9144 // The return type shall be void*. The first parameter shall have type 9145 // std::size_t. 9146 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9147 SizeTy, 9148 diag::err_operator_new_dependent_param_type, 9149 diag::err_operator_new_param_type)) 9150 return true; 9151 9152 // C++ [basic.stc.dynamic.allocation]p1: 9153 // The first parameter shall not have an associated default argument. 9154 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9155 return SemaRef.Diag(FnDecl->getLocation(), 9156 diag::err_operator_new_default_arg) 9157 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9158 9159 return false; 9160} 9161 9162static bool 9163CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9164 // C++ [basic.stc.dynamic.deallocation]p1: 9165 // A program is ill-formed if deallocation functions are declared in a 9166 // namespace scope other than global scope or declared static in global 9167 // scope. 9168 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9169 return true; 9170 9171 // C++ [basic.stc.dynamic.deallocation]p2: 9172 // Each deallocation function shall return void and its first parameter 9173 // shall be void*. 9174 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9175 SemaRef.Context.VoidPtrTy, 9176 diag::err_operator_delete_dependent_param_type, 9177 diag::err_operator_delete_param_type)) 9178 return true; 9179 9180 return false; 9181} 9182 9183/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9184/// of this overloaded operator is well-formed. If so, returns false; 9185/// otherwise, emits appropriate diagnostics and returns true. 9186bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9187 assert(FnDecl && FnDecl->isOverloadedOperator() && 9188 "Expected an overloaded operator declaration"); 9189 9190 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9191 9192 // C++ [over.oper]p5: 9193 // The allocation and deallocation functions, operator new, 9194 // operator new[], operator delete and operator delete[], are 9195 // described completely in 3.7.3. The attributes and restrictions 9196 // found in the rest of this subclause do not apply to them unless 9197 // explicitly stated in 3.7.3. 9198 if (Op == OO_Delete || Op == OO_Array_Delete) 9199 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9200 9201 if (Op == OO_New || Op == OO_Array_New) 9202 return CheckOperatorNewDeclaration(*this, FnDecl); 9203 9204 // C++ [over.oper]p6: 9205 // An operator function shall either be a non-static member 9206 // function or be a non-member function and have at least one 9207 // parameter whose type is a class, a reference to a class, an 9208 // enumeration, or a reference to an enumeration. 9209 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9210 if (MethodDecl->isStatic()) 9211 return Diag(FnDecl->getLocation(), 9212 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9213 } else { 9214 bool ClassOrEnumParam = false; 9215 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9216 ParamEnd = FnDecl->param_end(); 9217 Param != ParamEnd; ++Param) { 9218 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9219 if (ParamType->isDependentType() || ParamType->isRecordType() || 9220 ParamType->isEnumeralType()) { 9221 ClassOrEnumParam = true; 9222 break; 9223 } 9224 } 9225 9226 if (!ClassOrEnumParam) 9227 return Diag(FnDecl->getLocation(), 9228 diag::err_operator_overload_needs_class_or_enum) 9229 << FnDecl->getDeclName(); 9230 } 9231 9232 // C++ [over.oper]p8: 9233 // An operator function cannot have default arguments (8.3.6), 9234 // except where explicitly stated below. 9235 // 9236 // Only the function-call operator allows default arguments 9237 // (C++ [over.call]p1). 9238 if (Op != OO_Call) { 9239 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9240 Param != FnDecl->param_end(); ++Param) { 9241 if ((*Param)->hasDefaultArg()) 9242 return Diag((*Param)->getLocation(), 9243 diag::err_operator_overload_default_arg) 9244 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9245 } 9246 } 9247 9248 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9249 { false, false, false } 9250#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9251 , { Unary, Binary, MemberOnly } 9252#include "clang/Basic/OperatorKinds.def" 9253 }; 9254 9255 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9256 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9257 bool MustBeMemberOperator = OperatorUses[Op][2]; 9258 9259 // C++ [over.oper]p8: 9260 // [...] Operator functions cannot have more or fewer parameters 9261 // than the number required for the corresponding operator, as 9262 // described in the rest of this subclause. 9263 unsigned NumParams = FnDecl->getNumParams() 9264 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9265 if (Op != OO_Call && 9266 ((NumParams == 1 && !CanBeUnaryOperator) || 9267 (NumParams == 2 && !CanBeBinaryOperator) || 9268 (NumParams < 1) || (NumParams > 2))) { 9269 // We have the wrong number of parameters. 9270 unsigned ErrorKind; 9271 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9272 ErrorKind = 2; // 2 -> unary or binary. 9273 } else if (CanBeUnaryOperator) { 9274 ErrorKind = 0; // 0 -> unary 9275 } else { 9276 assert(CanBeBinaryOperator && 9277 "All non-call overloaded operators are unary or binary!"); 9278 ErrorKind = 1; // 1 -> binary 9279 } 9280 9281 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9282 << FnDecl->getDeclName() << NumParams << ErrorKind; 9283 } 9284 9285 // Overloaded operators other than operator() cannot be variadic. 9286 if (Op != OO_Call && 9287 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9288 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9289 << FnDecl->getDeclName(); 9290 } 9291 9292 // Some operators must be non-static member functions. 9293 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9294 return Diag(FnDecl->getLocation(), 9295 diag::err_operator_overload_must_be_member) 9296 << FnDecl->getDeclName(); 9297 } 9298 9299 // C++ [over.inc]p1: 9300 // The user-defined function called operator++ implements the 9301 // prefix and postfix ++ operator. If this function is a member 9302 // function with no parameters, or a non-member function with one 9303 // parameter of class or enumeration type, it defines the prefix 9304 // increment operator ++ for objects of that type. If the function 9305 // is a member function with one parameter (which shall be of type 9306 // int) or a non-member function with two parameters (the second 9307 // of which shall be of type int), it defines the postfix 9308 // increment operator ++ for objects of that type. 9309 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9310 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9311 bool ParamIsInt = false; 9312 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9313 ParamIsInt = BT->getKind() == BuiltinType::Int; 9314 9315 if (!ParamIsInt) 9316 return Diag(LastParam->getLocation(), 9317 diag::err_operator_overload_post_incdec_must_be_int) 9318 << LastParam->getType() << (Op == OO_MinusMinus); 9319 } 9320 9321 return false; 9322} 9323 9324/// CheckLiteralOperatorDeclaration - Check whether the declaration 9325/// of this literal operator function is well-formed. If so, returns 9326/// false; otherwise, emits appropriate diagnostics and returns true. 9327bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9328 DeclContext *DC = FnDecl->getDeclContext(); 9329 Decl::Kind Kind = DC->getDeclKind(); 9330 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 9331 Kind != Decl::LinkageSpec) { 9332 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9333 << FnDecl->getDeclName(); 9334 return true; 9335 } 9336 9337 bool Valid = false; 9338 9339 // template <char...> type operator "" name() is the only valid template 9340 // signature, and the only valid signature with no parameters. 9341 if (FnDecl->param_size() == 0) { 9342 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 9343 // Must have only one template parameter 9344 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9345 if (Params->size() == 1) { 9346 NonTypeTemplateParmDecl *PmDecl = 9347 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9348 9349 // The template parameter must be a char parameter pack. 9350 if (PmDecl && PmDecl->isTemplateParameterPack() && 9351 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9352 Valid = true; 9353 } 9354 } 9355 } else { 9356 // Check the first parameter 9357 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9358 9359 QualType T = (*Param)->getType(); 9360 9361 // unsigned long long int, long double, and any character type are allowed 9362 // as the only parameters. 9363 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9364 Context.hasSameType(T, Context.LongDoubleTy) || 9365 Context.hasSameType(T, Context.CharTy) || 9366 Context.hasSameType(T, Context.WCharTy) || 9367 Context.hasSameType(T, Context.Char16Ty) || 9368 Context.hasSameType(T, Context.Char32Ty)) { 9369 if (++Param == FnDecl->param_end()) 9370 Valid = true; 9371 goto FinishedParams; 9372 } 9373 9374 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9375 const PointerType *PT = T->getAs<PointerType>(); 9376 if (!PT) 9377 goto FinishedParams; 9378 T = PT->getPointeeType(); 9379 if (!T.isConstQualified()) 9380 goto FinishedParams; 9381 T = T.getUnqualifiedType(); 9382 9383 // Move on to the second parameter; 9384 ++Param; 9385 9386 // If there is no second parameter, the first must be a const char * 9387 if (Param == FnDecl->param_end()) { 9388 if (Context.hasSameType(T, Context.CharTy)) 9389 Valid = true; 9390 goto FinishedParams; 9391 } 9392 9393 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9394 // are allowed as the first parameter to a two-parameter function 9395 if (!(Context.hasSameType(T, Context.CharTy) || 9396 Context.hasSameType(T, Context.WCharTy) || 9397 Context.hasSameType(T, Context.Char16Ty) || 9398 Context.hasSameType(T, Context.Char32Ty))) 9399 goto FinishedParams; 9400 9401 // The second and final parameter must be an std::size_t 9402 T = (*Param)->getType().getUnqualifiedType(); 9403 if (Context.hasSameType(T, Context.getSizeType()) && 9404 ++Param == FnDecl->param_end()) 9405 Valid = true; 9406 } 9407 9408 // FIXME: This diagnostic is absolutely terrible. 9409FinishedParams: 9410 if (!Valid) { 9411 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9412 << FnDecl->getDeclName(); 9413 return true; 9414 } 9415 9416 StringRef LiteralName 9417 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9418 if (LiteralName[0] != '_') { 9419 // C++0x [usrlit.suffix]p1: 9420 // Literal suffix identifiers that do not start with an underscore are 9421 // reserved for future standardization. 9422 bool IsHexFloat = true; 9423 if (LiteralName.size() > 1 && 9424 (LiteralName[0] == 'P' || LiteralName[0] == 'p')) { 9425 for (unsigned I = 1, N = LiteralName.size(); I < N; ++I) { 9426 if (!isdigit(LiteralName[I])) { 9427 IsHexFloat = false; 9428 break; 9429 } 9430 } 9431 } 9432 9433 if (IsHexFloat) 9434 Diag(FnDecl->getLocation(), diag::warn_user_literal_hexfloat) 9435 << LiteralName; 9436 else 9437 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9438 } 9439 9440 return false; 9441} 9442 9443/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9444/// linkage specification, including the language and (if present) 9445/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9446/// the location of the language string literal, which is provided 9447/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9448/// the '{' brace. Otherwise, this linkage specification does not 9449/// have any braces. 9450Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9451 SourceLocation LangLoc, 9452 StringRef Lang, 9453 SourceLocation LBraceLoc) { 9454 LinkageSpecDecl::LanguageIDs Language; 9455 if (Lang == "\"C\"") 9456 Language = LinkageSpecDecl::lang_c; 9457 else if (Lang == "\"C++\"") 9458 Language = LinkageSpecDecl::lang_cxx; 9459 else { 9460 Diag(LangLoc, diag::err_bad_language); 9461 return 0; 9462 } 9463 9464 // FIXME: Add all the various semantics of linkage specifications 9465 9466 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9467 ExternLoc, LangLoc, Language); 9468 CurContext->addDecl(D); 9469 PushDeclContext(S, D); 9470 return D; 9471} 9472 9473/// ActOnFinishLinkageSpecification - Complete the definition of 9474/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9475/// valid, it's the position of the closing '}' brace in a linkage 9476/// specification that uses braces. 9477Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9478 Decl *LinkageSpec, 9479 SourceLocation RBraceLoc) { 9480 if (LinkageSpec) { 9481 if (RBraceLoc.isValid()) { 9482 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9483 LSDecl->setRBraceLoc(RBraceLoc); 9484 } 9485 PopDeclContext(); 9486 } 9487 return LinkageSpec; 9488} 9489 9490/// \brief Perform semantic analysis for the variable declaration that 9491/// occurs within a C++ catch clause, returning the newly-created 9492/// variable. 9493VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9494 TypeSourceInfo *TInfo, 9495 SourceLocation StartLoc, 9496 SourceLocation Loc, 9497 IdentifierInfo *Name) { 9498 bool Invalid = false; 9499 QualType ExDeclType = TInfo->getType(); 9500 9501 // Arrays and functions decay. 9502 if (ExDeclType->isArrayType()) 9503 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9504 else if (ExDeclType->isFunctionType()) 9505 ExDeclType = Context.getPointerType(ExDeclType); 9506 9507 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9508 // The exception-declaration shall not denote a pointer or reference to an 9509 // incomplete type, other than [cv] void*. 9510 // N2844 forbids rvalue references. 9511 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9512 Diag(Loc, diag::err_catch_rvalue_ref); 9513 Invalid = true; 9514 } 9515 9516 QualType BaseType = ExDeclType; 9517 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9518 unsigned DK = diag::err_catch_incomplete; 9519 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9520 BaseType = Ptr->getPointeeType(); 9521 Mode = 1; 9522 DK = diag::err_catch_incomplete_ptr; 9523 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9524 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9525 BaseType = Ref->getPointeeType(); 9526 Mode = 2; 9527 DK = diag::err_catch_incomplete_ref; 9528 } 9529 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9530 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 9531 Invalid = true; 9532 9533 if (!Invalid && !ExDeclType->isDependentType() && 9534 RequireNonAbstractType(Loc, ExDeclType, 9535 diag::err_abstract_type_in_decl, 9536 AbstractVariableType)) 9537 Invalid = true; 9538 9539 // Only the non-fragile NeXT runtime currently supports C++ catches 9540 // of ObjC types, and no runtime supports catching ObjC types by value. 9541 if (!Invalid && getLangOptions().ObjC1) { 9542 QualType T = ExDeclType; 9543 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9544 T = RT->getPointeeType(); 9545 9546 if (T->isObjCObjectType()) { 9547 Diag(Loc, diag::err_objc_object_catch); 9548 Invalid = true; 9549 } else if (T->isObjCObjectPointerType()) { 9550 if (!getLangOptions().ObjCNonFragileABI) 9551 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9552 } 9553 } 9554 9555 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9556 ExDeclType, TInfo, SC_None, SC_None); 9557 ExDecl->setExceptionVariable(true); 9558 9559 // In ARC, infer 'retaining' for variables of retainable type. 9560 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9561 Invalid = true; 9562 9563 if (!Invalid && !ExDeclType->isDependentType()) { 9564 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9565 // C++ [except.handle]p16: 9566 // The object declared in an exception-declaration or, if the 9567 // exception-declaration does not specify a name, a temporary (12.2) is 9568 // copy-initialized (8.5) from the exception object. [...] 9569 // The object is destroyed when the handler exits, after the destruction 9570 // of any automatic objects initialized within the handler. 9571 // 9572 // We just pretend to initialize the object with itself, then make sure 9573 // it can be destroyed later. 9574 QualType initType = ExDeclType; 9575 9576 InitializedEntity entity = 9577 InitializedEntity::InitializeVariable(ExDecl); 9578 InitializationKind initKind = 9579 InitializationKind::CreateCopy(Loc, SourceLocation()); 9580 9581 Expr *opaqueValue = 9582 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9583 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9584 ExprResult result = sequence.Perform(*this, entity, initKind, 9585 MultiExprArg(&opaqueValue, 1)); 9586 if (result.isInvalid()) 9587 Invalid = true; 9588 else { 9589 // If the constructor used was non-trivial, set this as the 9590 // "initializer". 9591 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9592 if (!construct->getConstructor()->isTrivial()) { 9593 Expr *init = MaybeCreateExprWithCleanups(construct); 9594 ExDecl->setInit(init); 9595 } 9596 9597 // And make sure it's destructable. 9598 FinalizeVarWithDestructor(ExDecl, recordType); 9599 } 9600 } 9601 } 9602 9603 if (Invalid) 9604 ExDecl->setInvalidDecl(); 9605 9606 return ExDecl; 9607} 9608 9609/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9610/// handler. 9611Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9612 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9613 bool Invalid = D.isInvalidType(); 9614 9615 // Check for unexpanded parameter packs. 9616 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9617 UPPC_ExceptionType)) { 9618 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9619 D.getIdentifierLoc()); 9620 Invalid = true; 9621 } 9622 9623 IdentifierInfo *II = D.getIdentifier(); 9624 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9625 LookupOrdinaryName, 9626 ForRedeclaration)) { 9627 // The scope should be freshly made just for us. There is just no way 9628 // it contains any previous declaration. 9629 assert(!S->isDeclScope(PrevDecl)); 9630 if (PrevDecl->isTemplateParameter()) { 9631 // Maybe we will complain about the shadowed template parameter. 9632 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9633 PrevDecl = 0; 9634 } 9635 } 9636 9637 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9638 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9639 << D.getCXXScopeSpec().getRange(); 9640 Invalid = true; 9641 } 9642 9643 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9644 D.getSourceRange().getBegin(), 9645 D.getIdentifierLoc(), 9646 D.getIdentifier()); 9647 if (Invalid) 9648 ExDecl->setInvalidDecl(); 9649 9650 // Add the exception declaration into this scope. 9651 if (II) 9652 PushOnScopeChains(ExDecl, S); 9653 else 9654 CurContext->addDecl(ExDecl); 9655 9656 ProcessDeclAttributes(S, ExDecl, D); 9657 return ExDecl; 9658} 9659 9660Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9661 Expr *AssertExpr, 9662 Expr *AssertMessageExpr_, 9663 SourceLocation RParenLoc) { 9664 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9665 9666 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9667 // In a static_assert-declaration, the constant-expression shall be a 9668 // constant expression that can be contextually converted to bool. 9669 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 9670 if (Converted.isInvalid()) 9671 return 0; 9672 9673 llvm::APSInt Cond; 9674 if (VerifyIntegerConstantExpression(Converted.get(), &Cond, 9675 PDiag(diag::err_static_assert_expression_is_not_constant), 9676 /*AllowFold=*/false).isInvalid()) 9677 return 0; 9678 9679 if (!Cond) 9680 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9681 << AssertMessage->getString() << AssertExpr->getSourceRange(); 9682 } 9683 9684 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9685 return 0; 9686 9687 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9688 AssertExpr, AssertMessage, RParenLoc); 9689 9690 CurContext->addDecl(Decl); 9691 return Decl; 9692} 9693 9694/// \brief Perform semantic analysis of the given friend type declaration. 9695/// 9696/// \returns A friend declaration that. 9697FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc, 9698 SourceLocation FriendLoc, 9699 TypeSourceInfo *TSInfo) { 9700 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9701 9702 QualType T = TSInfo->getType(); 9703 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9704 9705 // C++03 [class.friend]p2: 9706 // An elaborated-type-specifier shall be used in a friend declaration 9707 // for a class.* 9708 // 9709 // * The class-key of the elaborated-type-specifier is required. 9710 if (!ActiveTemplateInstantiations.empty()) { 9711 // Do not complain about the form of friend template types during 9712 // template instantiation; we will already have complained when the 9713 // template was declared. 9714 } else if (!T->isElaboratedTypeSpecifier()) { 9715 // If we evaluated the type to a record type, suggest putting 9716 // a tag in front. 9717 if (const RecordType *RT = T->getAs<RecordType>()) { 9718 RecordDecl *RD = RT->getDecl(); 9719 9720 std::string InsertionText = std::string(" ") + RD->getKindName(); 9721 9722 Diag(TypeRange.getBegin(), 9723 getLangOptions().CPlusPlus0x ? 9724 diag::warn_cxx98_compat_unelaborated_friend_type : 9725 diag::ext_unelaborated_friend_type) 9726 << (unsigned) RD->getTagKind() 9727 << T 9728 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9729 InsertionText); 9730 } else { 9731 Diag(FriendLoc, 9732 getLangOptions().CPlusPlus0x ? 9733 diag::warn_cxx98_compat_nonclass_type_friend : 9734 diag::ext_nonclass_type_friend) 9735 << T 9736 << SourceRange(FriendLoc, TypeRange.getEnd()); 9737 } 9738 } else if (T->getAs<EnumType>()) { 9739 Diag(FriendLoc, 9740 getLangOptions().CPlusPlus0x ? 9741 diag::warn_cxx98_compat_enum_friend : 9742 diag::ext_enum_friend) 9743 << T 9744 << SourceRange(FriendLoc, TypeRange.getEnd()); 9745 } 9746 9747 // C++0x [class.friend]p3: 9748 // If the type specifier in a friend declaration designates a (possibly 9749 // cv-qualified) class type, that class is declared as a friend; otherwise, 9750 // the friend declaration is ignored. 9751 9752 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9753 // in [class.friend]p3 that we do not implement. 9754 9755 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc); 9756} 9757 9758/// Handle a friend tag declaration where the scope specifier was 9759/// templated. 9760Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9761 unsigned TagSpec, SourceLocation TagLoc, 9762 CXXScopeSpec &SS, 9763 IdentifierInfo *Name, SourceLocation NameLoc, 9764 AttributeList *Attr, 9765 MultiTemplateParamsArg TempParamLists) { 9766 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9767 9768 bool isExplicitSpecialization = false; 9769 bool Invalid = false; 9770 9771 if (TemplateParameterList *TemplateParams 9772 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9773 TempParamLists.get(), 9774 TempParamLists.size(), 9775 /*friend*/ true, 9776 isExplicitSpecialization, 9777 Invalid)) { 9778 if (TemplateParams->size() > 0) { 9779 // This is a declaration of a class template. 9780 if (Invalid) 9781 return 0; 9782 9783 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9784 SS, Name, NameLoc, Attr, 9785 TemplateParams, AS_public, 9786 /*ModulePrivateLoc=*/SourceLocation(), 9787 TempParamLists.size() - 1, 9788 (TemplateParameterList**) TempParamLists.release()).take(); 9789 } else { 9790 // The "template<>" header is extraneous. 9791 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9792 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9793 isExplicitSpecialization = true; 9794 } 9795 } 9796 9797 if (Invalid) return 0; 9798 9799 bool isAllExplicitSpecializations = true; 9800 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9801 if (TempParamLists.get()[I]->size()) { 9802 isAllExplicitSpecializations = false; 9803 break; 9804 } 9805 } 9806 9807 // FIXME: don't ignore attributes. 9808 9809 // If it's explicit specializations all the way down, just forget 9810 // about the template header and build an appropriate non-templated 9811 // friend. TODO: for source fidelity, remember the headers. 9812 if (isAllExplicitSpecializations) { 9813 if (SS.isEmpty()) { 9814 bool Owned = false; 9815 bool IsDependent = false; 9816 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 9817 Attr, AS_public, 9818 /*ModulePrivateLoc=*/SourceLocation(), 9819 MultiTemplateParamsArg(), Owned, IsDependent, 9820 /*ScopedEnumKWLoc=*/SourceLocation(), 9821 /*ScopedEnumUsesClassTag=*/false, 9822 /*UnderlyingType=*/TypeResult()); 9823 } 9824 9825 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9826 ElaboratedTypeKeyword Keyword 9827 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9828 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9829 *Name, NameLoc); 9830 if (T.isNull()) 9831 return 0; 9832 9833 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9834 if (isa<DependentNameType>(T)) { 9835 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9836 TL.setElaboratedKeywordLoc(TagLoc); 9837 TL.setQualifierLoc(QualifierLoc); 9838 TL.setNameLoc(NameLoc); 9839 } else { 9840 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9841 TL.setElaboratedKeywordLoc(TagLoc); 9842 TL.setQualifierLoc(QualifierLoc); 9843 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 9844 } 9845 9846 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9847 TSI, FriendLoc); 9848 Friend->setAccess(AS_public); 9849 CurContext->addDecl(Friend); 9850 return Friend; 9851 } 9852 9853 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9854 9855 9856 9857 // Handle the case of a templated-scope friend class. e.g. 9858 // template <class T> class A<T>::B; 9859 // FIXME: we don't support these right now. 9860 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9861 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 9862 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9863 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9864 TL.setElaboratedKeywordLoc(TagLoc); 9865 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 9866 TL.setNameLoc(NameLoc); 9867 9868 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9869 TSI, FriendLoc); 9870 Friend->setAccess(AS_public); 9871 Friend->setUnsupportedFriend(true); 9872 CurContext->addDecl(Friend); 9873 return Friend; 9874} 9875 9876 9877/// Handle a friend type declaration. This works in tandem with 9878/// ActOnTag. 9879/// 9880/// Notes on friend class templates: 9881/// 9882/// We generally treat friend class declarations as if they were 9883/// declaring a class. So, for example, the elaborated type specifier 9884/// in a friend declaration is required to obey the restrictions of a 9885/// class-head (i.e. no typedefs in the scope chain), template 9886/// parameters are required to match up with simple template-ids, &c. 9887/// However, unlike when declaring a template specialization, it's 9888/// okay to refer to a template specialization without an empty 9889/// template parameter declaration, e.g. 9890/// friend class A<T>::B<unsigned>; 9891/// We permit this as a special case; if there are any template 9892/// parameters present at all, require proper matching, i.e. 9893/// template <> template <class T> friend class A<int>::B; 9894Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 9895 MultiTemplateParamsArg TempParams) { 9896 SourceLocation Loc = DS.getSourceRange().getBegin(); 9897 9898 assert(DS.isFriendSpecified()); 9899 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9900 9901 // Try to convert the decl specifier to a type. This works for 9902 // friend templates because ActOnTag never produces a ClassTemplateDecl 9903 // for a TUK_Friend. 9904 Declarator TheDeclarator(DS, Declarator::MemberContext); 9905 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 9906 QualType T = TSI->getType(); 9907 if (TheDeclarator.isInvalidType()) 9908 return 0; 9909 9910 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 9911 return 0; 9912 9913 // This is definitely an error in C++98. It's probably meant to 9914 // be forbidden in C++0x, too, but the specification is just 9915 // poorly written. 9916 // 9917 // The problem is with declarations like the following: 9918 // template <T> friend A<T>::foo; 9919 // where deciding whether a class C is a friend or not now hinges 9920 // on whether there exists an instantiation of A that causes 9921 // 'foo' to equal C. There are restrictions on class-heads 9922 // (which we declare (by fiat) elaborated friend declarations to 9923 // be) that makes this tractable. 9924 // 9925 // FIXME: handle "template <> friend class A<T>;", which 9926 // is possibly well-formed? Who even knows? 9927 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 9928 Diag(Loc, diag::err_tagless_friend_type_template) 9929 << DS.getSourceRange(); 9930 return 0; 9931 } 9932 9933 // C++98 [class.friend]p1: A friend of a class is a function 9934 // or class that is not a member of the class . . . 9935 // This is fixed in DR77, which just barely didn't make the C++03 9936 // deadline. It's also a very silly restriction that seriously 9937 // affects inner classes and which nobody else seems to implement; 9938 // thus we never diagnose it, not even in -pedantic. 9939 // 9940 // But note that we could warn about it: it's always useless to 9941 // friend one of your own members (it's not, however, worthless to 9942 // friend a member of an arbitrary specialization of your template). 9943 9944 Decl *D; 9945 if (unsigned NumTempParamLists = TempParams.size()) 9946 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 9947 NumTempParamLists, 9948 TempParams.release(), 9949 TSI, 9950 DS.getFriendSpecLoc()); 9951 else 9952 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 9953 9954 if (!D) 9955 return 0; 9956 9957 D->setAccess(AS_public); 9958 CurContext->addDecl(D); 9959 9960 return D; 9961} 9962 9963Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 9964 MultiTemplateParamsArg TemplateParams) { 9965 const DeclSpec &DS = D.getDeclSpec(); 9966 9967 assert(DS.isFriendSpecified()); 9968 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9969 9970 SourceLocation Loc = D.getIdentifierLoc(); 9971 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9972 9973 // C++ [class.friend]p1 9974 // A friend of a class is a function or class.... 9975 // Note that this sees through typedefs, which is intended. 9976 // It *doesn't* see through dependent types, which is correct 9977 // according to [temp.arg.type]p3: 9978 // If a declaration acquires a function type through a 9979 // type dependent on a template-parameter and this causes 9980 // a declaration that does not use the syntactic form of a 9981 // function declarator to have a function type, the program 9982 // is ill-formed. 9983 if (!TInfo->getType()->isFunctionType()) { 9984 Diag(Loc, diag::err_unexpected_friend); 9985 9986 // It might be worthwhile to try to recover by creating an 9987 // appropriate declaration. 9988 return 0; 9989 } 9990 9991 // C++ [namespace.memdef]p3 9992 // - If a friend declaration in a non-local class first declares a 9993 // class or function, the friend class or function is a member 9994 // of the innermost enclosing namespace. 9995 // - The name of the friend is not found by simple name lookup 9996 // until a matching declaration is provided in that namespace 9997 // scope (either before or after the class declaration granting 9998 // friendship). 9999 // - If a friend function is called, its name may be found by the 10000 // name lookup that considers functions from namespaces and 10001 // classes associated with the types of the function arguments. 10002 // - When looking for a prior declaration of a class or a function 10003 // declared as a friend, scopes outside the innermost enclosing 10004 // namespace scope are not considered. 10005 10006 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10007 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10008 DeclarationName Name = NameInfo.getName(); 10009 assert(Name); 10010 10011 // Check for unexpanded parameter packs. 10012 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10013 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10014 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10015 return 0; 10016 10017 // The context we found the declaration in, or in which we should 10018 // create the declaration. 10019 DeclContext *DC; 10020 Scope *DCScope = S; 10021 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10022 ForRedeclaration); 10023 10024 // FIXME: there are different rules in local classes 10025 10026 // There are four cases here. 10027 // - There's no scope specifier, in which case we just go to the 10028 // appropriate scope and look for a function or function template 10029 // there as appropriate. 10030 // Recover from invalid scope qualifiers as if they just weren't there. 10031 if (SS.isInvalid() || !SS.isSet()) { 10032 // C++0x [namespace.memdef]p3: 10033 // If the name in a friend declaration is neither qualified nor 10034 // a template-id and the declaration is a function or an 10035 // elaborated-type-specifier, the lookup to determine whether 10036 // the entity has been previously declared shall not consider 10037 // any scopes outside the innermost enclosing namespace. 10038 // C++0x [class.friend]p11: 10039 // If a friend declaration appears in a local class and the name 10040 // specified is an unqualified name, a prior declaration is 10041 // looked up without considering scopes that are outside the 10042 // innermost enclosing non-class scope. For a friend function 10043 // declaration, if there is no prior declaration, the program is 10044 // ill-formed. 10045 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10046 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10047 10048 // Find the appropriate context according to the above. 10049 DC = CurContext; 10050 while (true) { 10051 // Skip class contexts. If someone can cite chapter and verse 10052 // for this behavior, that would be nice --- it's what GCC and 10053 // EDG do, and it seems like a reasonable intent, but the spec 10054 // really only says that checks for unqualified existing 10055 // declarations should stop at the nearest enclosing namespace, 10056 // not that they should only consider the nearest enclosing 10057 // namespace. 10058 while (DC->isRecord()) 10059 DC = DC->getParent(); 10060 10061 LookupQualifiedName(Previous, DC); 10062 10063 // TODO: decide what we think about using declarations. 10064 if (isLocal || !Previous.empty()) 10065 break; 10066 10067 if (isTemplateId) { 10068 if (isa<TranslationUnitDecl>(DC)) break; 10069 } else { 10070 if (DC->isFileContext()) break; 10071 } 10072 DC = DC->getParent(); 10073 } 10074 10075 // C++ [class.friend]p1: A friend of a class is a function or 10076 // class that is not a member of the class . . . 10077 // C++11 changes this for both friend types and functions. 10078 // Most C++ 98 compilers do seem to give an error here, so 10079 // we do, too. 10080 if (!Previous.empty() && DC->Equals(CurContext)) 10081 Diag(DS.getFriendSpecLoc(), 10082 getLangOptions().CPlusPlus0x ? 10083 diag::warn_cxx98_compat_friend_is_member : 10084 diag::err_friend_is_member); 10085 10086 DCScope = getScopeForDeclContext(S, DC); 10087 10088 // C++ [class.friend]p6: 10089 // A function can be defined in a friend declaration of a class if and 10090 // only if the class is a non-local class (9.8), the function name is 10091 // unqualified, and the function has namespace scope. 10092 if (isLocal && D.isFunctionDefinition()) { 10093 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10094 } 10095 10096 // - There's a non-dependent scope specifier, in which case we 10097 // compute it and do a previous lookup there for a function 10098 // or function template. 10099 } else if (!SS.getScopeRep()->isDependent()) { 10100 DC = computeDeclContext(SS); 10101 if (!DC) return 0; 10102 10103 if (RequireCompleteDeclContext(SS, DC)) return 0; 10104 10105 LookupQualifiedName(Previous, DC); 10106 10107 // Ignore things found implicitly in the wrong scope. 10108 // TODO: better diagnostics for this case. Suggesting the right 10109 // qualified scope would be nice... 10110 LookupResult::Filter F = Previous.makeFilter(); 10111 while (F.hasNext()) { 10112 NamedDecl *D = F.next(); 10113 if (!DC->InEnclosingNamespaceSetOf( 10114 D->getDeclContext()->getRedeclContext())) 10115 F.erase(); 10116 } 10117 F.done(); 10118 10119 if (Previous.empty()) { 10120 D.setInvalidType(); 10121 Diag(Loc, diag::err_qualified_friend_not_found) 10122 << Name << TInfo->getType(); 10123 return 0; 10124 } 10125 10126 // C++ [class.friend]p1: A friend of a class is a function or 10127 // class that is not a member of the class . . . 10128 if (DC->Equals(CurContext)) 10129 Diag(DS.getFriendSpecLoc(), 10130 getLangOptions().CPlusPlus0x ? 10131 diag::warn_cxx98_compat_friend_is_member : 10132 diag::err_friend_is_member); 10133 10134 if (D.isFunctionDefinition()) { 10135 // C++ [class.friend]p6: 10136 // A function can be defined in a friend declaration of a class if and 10137 // only if the class is a non-local class (9.8), the function name is 10138 // unqualified, and the function has namespace scope. 10139 SemaDiagnosticBuilder DB 10140 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10141 10142 DB << SS.getScopeRep(); 10143 if (DC->isFileContext()) 10144 DB << FixItHint::CreateRemoval(SS.getRange()); 10145 SS.clear(); 10146 } 10147 10148 // - There's a scope specifier that does not match any template 10149 // parameter lists, in which case we use some arbitrary context, 10150 // create a method or method template, and wait for instantiation. 10151 // - There's a scope specifier that does match some template 10152 // parameter lists, which we don't handle right now. 10153 } else { 10154 if (D.isFunctionDefinition()) { 10155 // C++ [class.friend]p6: 10156 // A function can be defined in a friend declaration of a class if and 10157 // only if the class is a non-local class (9.8), the function name is 10158 // unqualified, and the function has namespace scope. 10159 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10160 << SS.getScopeRep(); 10161 } 10162 10163 DC = CurContext; 10164 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10165 } 10166 10167 if (!DC->isRecord()) { 10168 // This implies that it has to be an operator or function. 10169 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10170 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10171 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10172 Diag(Loc, diag::err_introducing_special_friend) << 10173 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10174 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10175 return 0; 10176 } 10177 } 10178 10179 // FIXME: This is an egregious hack to cope with cases where the scope stack 10180 // does not contain the declaration context, i.e., in an out-of-line 10181 // definition of a class. 10182 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10183 if (!DCScope) { 10184 FakeDCScope.setEntity(DC); 10185 DCScope = &FakeDCScope; 10186 } 10187 10188 bool AddToScope = true; 10189 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10190 move(TemplateParams), AddToScope); 10191 if (!ND) return 0; 10192 10193 assert(ND->getDeclContext() == DC); 10194 assert(ND->getLexicalDeclContext() == CurContext); 10195 10196 // Add the function declaration to the appropriate lookup tables, 10197 // adjusting the redeclarations list as necessary. We don't 10198 // want to do this yet if the friending class is dependent. 10199 // 10200 // Also update the scope-based lookup if the target context's 10201 // lookup context is in lexical scope. 10202 if (!CurContext->isDependentContext()) { 10203 DC = DC->getRedeclContext(); 10204 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 10205 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10206 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10207 } 10208 10209 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10210 D.getIdentifierLoc(), ND, 10211 DS.getFriendSpecLoc()); 10212 FrD->setAccess(AS_public); 10213 CurContext->addDecl(FrD); 10214 10215 if (ND->isInvalidDecl()) 10216 FrD->setInvalidDecl(); 10217 else { 10218 FunctionDecl *FD; 10219 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10220 FD = FTD->getTemplatedDecl(); 10221 else 10222 FD = cast<FunctionDecl>(ND); 10223 10224 // Mark templated-scope function declarations as unsupported. 10225 if (FD->getNumTemplateParameterLists()) 10226 FrD->setUnsupportedFriend(true); 10227 } 10228 10229 return ND; 10230} 10231 10232void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10233 AdjustDeclIfTemplate(Dcl); 10234 10235 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10236 if (!Fn) { 10237 Diag(DelLoc, diag::err_deleted_non_function); 10238 return; 10239 } 10240 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10241 Diag(DelLoc, diag::err_deleted_decl_not_first); 10242 Diag(Prev->getLocation(), diag::note_previous_declaration); 10243 // If the declaration wasn't the first, we delete the function anyway for 10244 // recovery. 10245 } 10246 Fn->setDeletedAsWritten(); 10247} 10248 10249void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10250 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10251 10252 if (MD) { 10253 if (MD->getParent()->isDependentType()) { 10254 MD->setDefaulted(); 10255 MD->setExplicitlyDefaulted(); 10256 return; 10257 } 10258 10259 CXXSpecialMember Member = getSpecialMember(MD); 10260 if (Member == CXXInvalid) { 10261 Diag(DefaultLoc, diag::err_default_special_members); 10262 return; 10263 } 10264 10265 MD->setDefaulted(); 10266 MD->setExplicitlyDefaulted(); 10267 10268 // If this definition appears within the record, do the checking when 10269 // the record is complete. 10270 const FunctionDecl *Primary = MD; 10271 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10272 // Find the uninstantiated declaration that actually had the '= default' 10273 // on it. 10274 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10275 10276 if (Primary == Primary->getCanonicalDecl()) 10277 return; 10278 10279 switch (Member) { 10280 case CXXDefaultConstructor: { 10281 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10282 CheckExplicitlyDefaultedDefaultConstructor(CD); 10283 if (!CD->isInvalidDecl()) 10284 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10285 break; 10286 } 10287 10288 case CXXCopyConstructor: { 10289 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10290 CheckExplicitlyDefaultedCopyConstructor(CD); 10291 if (!CD->isInvalidDecl()) 10292 DefineImplicitCopyConstructor(DefaultLoc, CD); 10293 break; 10294 } 10295 10296 case CXXCopyAssignment: { 10297 CheckExplicitlyDefaultedCopyAssignment(MD); 10298 if (!MD->isInvalidDecl()) 10299 DefineImplicitCopyAssignment(DefaultLoc, MD); 10300 break; 10301 } 10302 10303 case CXXDestructor: { 10304 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10305 CheckExplicitlyDefaultedDestructor(DD); 10306 if (!DD->isInvalidDecl()) 10307 DefineImplicitDestructor(DefaultLoc, DD); 10308 break; 10309 } 10310 10311 case CXXMoveConstructor: { 10312 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10313 CheckExplicitlyDefaultedMoveConstructor(CD); 10314 if (!CD->isInvalidDecl()) 10315 DefineImplicitMoveConstructor(DefaultLoc, CD); 10316 break; 10317 } 10318 10319 case CXXMoveAssignment: { 10320 CheckExplicitlyDefaultedMoveAssignment(MD); 10321 if (!MD->isInvalidDecl()) 10322 DefineImplicitMoveAssignment(DefaultLoc, MD); 10323 break; 10324 } 10325 10326 case CXXInvalid: 10327 llvm_unreachable("Invalid special member."); 10328 } 10329 } else { 10330 Diag(DefaultLoc, diag::err_default_special_members); 10331 } 10332} 10333 10334static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10335 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10336 Stmt *SubStmt = *CI; 10337 if (!SubStmt) 10338 continue; 10339 if (isa<ReturnStmt>(SubStmt)) 10340 Self.Diag(SubStmt->getSourceRange().getBegin(), 10341 diag::err_return_in_constructor_handler); 10342 if (!isa<Expr>(SubStmt)) 10343 SearchForReturnInStmt(Self, SubStmt); 10344 } 10345} 10346 10347void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10348 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10349 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10350 SearchForReturnInStmt(*this, Handler); 10351 } 10352} 10353 10354bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10355 const CXXMethodDecl *Old) { 10356 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10357 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10358 10359 if (Context.hasSameType(NewTy, OldTy) || 10360 NewTy->isDependentType() || OldTy->isDependentType()) 10361 return false; 10362 10363 // Check if the return types are covariant 10364 QualType NewClassTy, OldClassTy; 10365 10366 /// Both types must be pointers or references to classes. 10367 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10368 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10369 NewClassTy = NewPT->getPointeeType(); 10370 OldClassTy = OldPT->getPointeeType(); 10371 } 10372 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10373 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10374 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10375 NewClassTy = NewRT->getPointeeType(); 10376 OldClassTy = OldRT->getPointeeType(); 10377 } 10378 } 10379 } 10380 10381 // The return types aren't either both pointers or references to a class type. 10382 if (NewClassTy.isNull()) { 10383 Diag(New->getLocation(), 10384 diag::err_different_return_type_for_overriding_virtual_function) 10385 << New->getDeclName() << NewTy << OldTy; 10386 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10387 10388 return true; 10389 } 10390 10391 // C++ [class.virtual]p6: 10392 // If the return type of D::f differs from the return type of B::f, the 10393 // class type in the return type of D::f shall be complete at the point of 10394 // declaration of D::f or shall be the class type D. 10395 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10396 if (!RT->isBeingDefined() && 10397 RequireCompleteType(New->getLocation(), NewClassTy, 10398 PDiag(diag::err_covariant_return_incomplete) 10399 << New->getDeclName())) 10400 return true; 10401 } 10402 10403 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10404 // Check if the new class derives from the old class. 10405 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10406 Diag(New->getLocation(), 10407 diag::err_covariant_return_not_derived) 10408 << New->getDeclName() << NewTy << OldTy; 10409 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10410 return true; 10411 } 10412 10413 // Check if we the conversion from derived to base is valid. 10414 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10415 diag::err_covariant_return_inaccessible_base, 10416 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10417 // FIXME: Should this point to the return type? 10418 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10419 // FIXME: this note won't trigger for delayed access control 10420 // diagnostics, and it's impossible to get an undelayed error 10421 // here from access control during the original parse because 10422 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10423 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10424 return true; 10425 } 10426 } 10427 10428 // The qualifiers of the return types must be the same. 10429 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10430 Diag(New->getLocation(), 10431 diag::err_covariant_return_type_different_qualifications) 10432 << New->getDeclName() << NewTy << OldTy; 10433 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10434 return true; 10435 }; 10436 10437 10438 // The new class type must have the same or less qualifiers as the old type. 10439 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10440 Diag(New->getLocation(), 10441 diag::err_covariant_return_type_class_type_more_qualified) 10442 << New->getDeclName() << NewTy << OldTy; 10443 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10444 return true; 10445 }; 10446 10447 return false; 10448} 10449 10450/// \brief Mark the given method pure. 10451/// 10452/// \param Method the method to be marked pure. 10453/// 10454/// \param InitRange the source range that covers the "0" initializer. 10455bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10456 SourceLocation EndLoc = InitRange.getEnd(); 10457 if (EndLoc.isValid()) 10458 Method->setRangeEnd(EndLoc); 10459 10460 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10461 Method->setPure(); 10462 return false; 10463 } 10464 10465 if (!Method->isInvalidDecl()) 10466 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10467 << Method->getDeclName() << InitRange; 10468 return true; 10469} 10470 10471/// \brief Determine whether the given declaration is a static data member. 10472static bool isStaticDataMember(Decl *D) { 10473 VarDecl *Var = dyn_cast_or_null<VarDecl>(D); 10474 if (!Var) 10475 return false; 10476 10477 return Var->isStaticDataMember(); 10478} 10479/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10480/// an initializer for the out-of-line declaration 'Dcl'. The scope 10481/// is a fresh scope pushed for just this purpose. 10482/// 10483/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10484/// static data member of class X, names should be looked up in the scope of 10485/// class X. 10486void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10487 // If there is no declaration, there was an error parsing it. 10488 if (D == 0 || D->isInvalidDecl()) return; 10489 10490 // We should only get called for declarations with scope specifiers, like: 10491 // int foo::bar; 10492 assert(D->isOutOfLine()); 10493 EnterDeclaratorContext(S, D->getDeclContext()); 10494 10495 // If we are parsing the initializer for a static data member, push a 10496 // new expression evaluation context that is associated with this static 10497 // data member. 10498 if (isStaticDataMember(D)) 10499 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 10500} 10501 10502/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10503/// initializer for the out-of-line declaration 'D'. 10504void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10505 // If there is no declaration, there was an error parsing it. 10506 if (D == 0 || D->isInvalidDecl()) return; 10507 10508 if (isStaticDataMember(D)) 10509 PopExpressionEvaluationContext(); 10510 10511 assert(D->isOutOfLine()); 10512 ExitDeclaratorContext(S); 10513} 10514 10515/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10516/// C++ if/switch/while/for statement. 10517/// e.g: "if (int x = f()) {...}" 10518DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10519 // C++ 6.4p2: 10520 // The declarator shall not specify a function or an array. 10521 // The type-specifier-seq shall not contain typedef and shall not declare a 10522 // new class or enumeration. 10523 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10524 "Parser allowed 'typedef' as storage class of condition decl."); 10525 10526 Decl *Dcl = ActOnDeclarator(S, D); 10527 if (!Dcl) 10528 return true; 10529 10530 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10531 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10532 << D.getSourceRange(); 10533 return true; 10534 } 10535 10536 return Dcl; 10537} 10538 10539void Sema::LoadExternalVTableUses() { 10540 if (!ExternalSource) 10541 return; 10542 10543 SmallVector<ExternalVTableUse, 4> VTables; 10544 ExternalSource->ReadUsedVTables(VTables); 10545 SmallVector<VTableUse, 4> NewUses; 10546 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10547 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10548 = VTablesUsed.find(VTables[I].Record); 10549 // Even if a definition wasn't required before, it may be required now. 10550 if (Pos != VTablesUsed.end()) { 10551 if (!Pos->second && VTables[I].DefinitionRequired) 10552 Pos->second = true; 10553 continue; 10554 } 10555 10556 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10557 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10558 } 10559 10560 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10561} 10562 10563void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10564 bool DefinitionRequired) { 10565 // Ignore any vtable uses in unevaluated operands or for classes that do 10566 // not have a vtable. 10567 if (!Class->isDynamicClass() || Class->isDependentContext() || 10568 CurContext->isDependentContext() || 10569 ExprEvalContexts.back().Context == Unevaluated) 10570 return; 10571 10572 // Try to insert this class into the map. 10573 LoadExternalVTableUses(); 10574 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10575 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10576 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10577 if (!Pos.second) { 10578 // If we already had an entry, check to see if we are promoting this vtable 10579 // to required a definition. If so, we need to reappend to the VTableUses 10580 // list, since we may have already processed the first entry. 10581 if (DefinitionRequired && !Pos.first->second) { 10582 Pos.first->second = true; 10583 } else { 10584 // Otherwise, we can early exit. 10585 return; 10586 } 10587 } 10588 10589 // Local classes need to have their virtual members marked 10590 // immediately. For all other classes, we mark their virtual members 10591 // at the end of the translation unit. 10592 if (Class->isLocalClass()) 10593 MarkVirtualMembersReferenced(Loc, Class); 10594 else 10595 VTableUses.push_back(std::make_pair(Class, Loc)); 10596} 10597 10598bool Sema::DefineUsedVTables() { 10599 LoadExternalVTableUses(); 10600 if (VTableUses.empty()) 10601 return false; 10602 10603 // Note: The VTableUses vector could grow as a result of marking 10604 // the members of a class as "used", so we check the size each 10605 // time through the loop and prefer indices (with are stable) to 10606 // iterators (which are not). 10607 bool DefinedAnything = false; 10608 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10609 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10610 if (!Class) 10611 continue; 10612 10613 SourceLocation Loc = VTableUses[I].second; 10614 10615 // If this class has a key function, but that key function is 10616 // defined in another translation unit, we don't need to emit the 10617 // vtable even though we're using it. 10618 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10619 if (KeyFunction && !KeyFunction->hasBody()) { 10620 switch (KeyFunction->getTemplateSpecializationKind()) { 10621 case TSK_Undeclared: 10622 case TSK_ExplicitSpecialization: 10623 case TSK_ExplicitInstantiationDeclaration: 10624 // The key function is in another translation unit. 10625 continue; 10626 10627 case TSK_ExplicitInstantiationDefinition: 10628 case TSK_ImplicitInstantiation: 10629 // We will be instantiating the key function. 10630 break; 10631 } 10632 } else if (!KeyFunction) { 10633 // If we have a class with no key function that is the subject 10634 // of an explicit instantiation declaration, suppress the 10635 // vtable; it will live with the explicit instantiation 10636 // definition. 10637 bool IsExplicitInstantiationDeclaration 10638 = Class->getTemplateSpecializationKind() 10639 == TSK_ExplicitInstantiationDeclaration; 10640 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10641 REnd = Class->redecls_end(); 10642 R != REnd; ++R) { 10643 TemplateSpecializationKind TSK 10644 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10645 if (TSK == TSK_ExplicitInstantiationDeclaration) 10646 IsExplicitInstantiationDeclaration = true; 10647 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10648 IsExplicitInstantiationDeclaration = false; 10649 break; 10650 } 10651 } 10652 10653 if (IsExplicitInstantiationDeclaration) 10654 continue; 10655 } 10656 10657 // Mark all of the virtual members of this class as referenced, so 10658 // that we can build a vtable. Then, tell the AST consumer that a 10659 // vtable for this class is required. 10660 DefinedAnything = true; 10661 MarkVirtualMembersReferenced(Loc, Class); 10662 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10663 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10664 10665 // Optionally warn if we're emitting a weak vtable. 10666 if (Class->getLinkage() == ExternalLinkage && 10667 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10668 const FunctionDecl *KeyFunctionDef = 0; 10669 if (!KeyFunction || 10670 (KeyFunction->hasBody(KeyFunctionDef) && 10671 KeyFunctionDef->isInlined())) 10672 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10673 TSK_ExplicitInstantiationDefinition 10674 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10675 << Class; 10676 } 10677 } 10678 VTableUses.clear(); 10679 10680 return DefinedAnything; 10681} 10682 10683void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10684 const CXXRecordDecl *RD) { 10685 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10686 e = RD->method_end(); i != e; ++i) { 10687 CXXMethodDecl *MD = *i; 10688 10689 // C++ [basic.def.odr]p2: 10690 // [...] A virtual member function is used if it is not pure. [...] 10691 if (MD->isVirtual() && !MD->isPure()) 10692 MarkFunctionReferenced(Loc, MD); 10693 } 10694 10695 // Only classes that have virtual bases need a VTT. 10696 if (RD->getNumVBases() == 0) 10697 return; 10698 10699 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10700 e = RD->bases_end(); i != e; ++i) { 10701 const CXXRecordDecl *Base = 10702 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10703 if (Base->getNumVBases() == 0) 10704 continue; 10705 MarkVirtualMembersReferenced(Loc, Base); 10706 } 10707} 10708 10709/// SetIvarInitializers - This routine builds initialization ASTs for the 10710/// Objective-C implementation whose ivars need be initialized. 10711void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10712 if (!getLangOptions().CPlusPlus) 10713 return; 10714 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10715 SmallVector<ObjCIvarDecl*, 8> ivars; 10716 CollectIvarsToConstructOrDestruct(OID, ivars); 10717 if (ivars.empty()) 10718 return; 10719 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10720 for (unsigned i = 0; i < ivars.size(); i++) { 10721 FieldDecl *Field = ivars[i]; 10722 if (Field->isInvalidDecl()) 10723 continue; 10724 10725 CXXCtorInitializer *Member; 10726 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10727 InitializationKind InitKind = 10728 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10729 10730 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10731 ExprResult MemberInit = 10732 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10733 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10734 // Note, MemberInit could actually come back empty if no initialization 10735 // is required (e.g., because it would call a trivial default constructor) 10736 if (!MemberInit.get() || MemberInit.isInvalid()) 10737 continue; 10738 10739 Member = 10740 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10741 SourceLocation(), 10742 MemberInit.takeAs<Expr>(), 10743 SourceLocation()); 10744 AllToInit.push_back(Member); 10745 10746 // Be sure that the destructor is accessible and is marked as referenced. 10747 if (const RecordType *RecordTy 10748 = Context.getBaseElementType(Field->getType()) 10749 ->getAs<RecordType>()) { 10750 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10751 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10752 MarkFunctionReferenced(Field->getLocation(), Destructor); 10753 CheckDestructorAccess(Field->getLocation(), Destructor, 10754 PDiag(diag::err_access_dtor_ivar) 10755 << Context.getBaseElementType(Field->getType())); 10756 } 10757 } 10758 } 10759 ObjCImplementation->setIvarInitializers(Context, 10760 AllToInit.data(), AllToInit.size()); 10761 } 10762} 10763 10764static 10765void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10766 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10767 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10768 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10769 Sema &S) { 10770 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10771 CE = Current.end(); 10772 if (Ctor->isInvalidDecl()) 10773 return; 10774 10775 const FunctionDecl *FNTarget = 0; 10776 CXXConstructorDecl *Target; 10777 10778 // We ignore the result here since if we don't have a body, Target will be 10779 // null below. 10780 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10781 Target 10782= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10783 10784 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10785 // Avoid dereferencing a null pointer here. 10786 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10787 10788 if (!Current.insert(Canonical)) 10789 return; 10790 10791 // We know that beyond here, we aren't chaining into a cycle. 10792 if (!Target || !Target->isDelegatingConstructor() || 10793 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10794 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10795 Valid.insert(*CI); 10796 Current.clear(); 10797 // We've hit a cycle. 10798 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 10799 Current.count(TCanonical)) { 10800 // If we haven't diagnosed this cycle yet, do so now. 10801 if (!Invalid.count(TCanonical)) { 10802 S.Diag((*Ctor->init_begin())->getSourceLocation(), 10803 diag::warn_delegating_ctor_cycle) 10804 << Ctor; 10805 10806 // Don't add a note for a function delegating directo to itself. 10807 if (TCanonical != Canonical) 10808 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 10809 10810 CXXConstructorDecl *C = Target; 10811 while (C->getCanonicalDecl() != Canonical) { 10812 (void)C->getTargetConstructor()->hasBody(FNTarget); 10813 assert(FNTarget && "Ctor cycle through bodiless function"); 10814 10815 C 10816 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 10817 S.Diag(C->getLocation(), diag::note_which_delegates_to); 10818 } 10819 } 10820 10821 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10822 Invalid.insert(*CI); 10823 Current.clear(); 10824 } else { 10825 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 10826 } 10827} 10828 10829 10830void Sema::CheckDelegatingCtorCycles() { 10831 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 10832 10833 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10834 CE = Current.end(); 10835 10836 for (DelegatingCtorDeclsType::iterator 10837 I = DelegatingCtorDecls.begin(ExternalSource), 10838 E = DelegatingCtorDecls.end(); 10839 I != E; ++I) { 10840 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 10841 } 10842 10843 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 10844 (*CI)->setInvalidDecl(); 10845} 10846 10847/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 10848Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 10849 // Implicitly declared functions (e.g. copy constructors) are 10850 // __host__ __device__ 10851 if (D->isImplicit()) 10852 return CFT_HostDevice; 10853 10854 if (D->hasAttr<CUDAGlobalAttr>()) 10855 return CFT_Global; 10856 10857 if (D->hasAttr<CUDADeviceAttr>()) { 10858 if (D->hasAttr<CUDAHostAttr>()) 10859 return CFT_HostDevice; 10860 else 10861 return CFT_Device; 10862 } 10863 10864 return CFT_Host; 10865} 10866 10867bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 10868 CUDAFunctionTarget CalleeTarget) { 10869 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 10870 // Callable from the device only." 10871 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 10872 return true; 10873 10874 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 10875 // Callable from the host only." 10876 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 10877 // Callable from the host only." 10878 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 10879 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 10880 return true; 10881 10882 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 10883 return true; 10884 10885 return false; 10886} 10887