SemaDeclCXX.cpp revision ab41fe914f63bb470dfa7e400876ada72f57a931
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/Sema/ScopeInfo.h" 20#include "clang/AST/ASTConsumer.h" 21#include "clang/AST/ASTContext.h" 22#include "clang/AST/ASTMutationListener.h" 23#include "clang/AST/CharUnits.h" 24#include "clang/AST/CXXInheritance.h" 25#include "clang/AST/DeclVisitor.h" 26#include "clang/AST/ExprCXX.h" 27#include "clang/AST/RecordLayout.h" 28#include "clang/AST/RecursiveASTVisitor.h" 29#include "clang/AST/StmtVisitor.h" 30#include "clang/AST/TypeLoc.h" 31#include "clang/AST/TypeOrdering.h" 32#include "clang/Sema/DeclSpec.h" 33#include "clang/Sema/ParsedTemplate.h" 34#include "clang/Basic/PartialDiagnostic.h" 35#include "clang/Lex/Preprocessor.h" 36#include "llvm/ADT/SmallString.h" 37#include "llvm/ADT/STLExtras.h" 38#include <map> 39#include <set> 40 41using namespace clang; 42 43//===----------------------------------------------------------------------===// 44// CheckDefaultArgumentVisitor 45//===----------------------------------------------------------------------===// 46 47namespace { 48 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 49 /// the default argument of a parameter to determine whether it 50 /// contains any ill-formed subexpressions. For example, this will 51 /// diagnose the use of local variables or parameters within the 52 /// default argument expression. 53 class CheckDefaultArgumentVisitor 54 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 55 Expr *DefaultArg; 56 Sema *S; 57 58 public: 59 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 60 : DefaultArg(defarg), S(s) {} 61 62 bool VisitExpr(Expr *Node); 63 bool VisitDeclRefExpr(DeclRefExpr *DRE); 64 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 65 bool VisitLambdaExpr(LambdaExpr *Lambda); 66 }; 67 68 /// VisitExpr - Visit all of the children of this expression. 69 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 70 bool IsInvalid = false; 71 for (Stmt::child_range I = Node->children(); I; ++I) 72 IsInvalid |= Visit(*I); 73 return IsInvalid; 74 } 75 76 /// VisitDeclRefExpr - Visit a reference to a declaration, to 77 /// determine whether this declaration can be used in the default 78 /// argument expression. 79 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 80 NamedDecl *Decl = DRE->getDecl(); 81 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 82 // C++ [dcl.fct.default]p9 83 // Default arguments are evaluated each time the function is 84 // called. The order of evaluation of function arguments is 85 // unspecified. Consequently, parameters of a function shall not 86 // be used in default argument expressions, even if they are not 87 // evaluated. Parameters of a function declared before a default 88 // argument expression are in scope and can hide namespace and 89 // class member names. 90 return S->Diag(DRE->getLocStart(), 91 diag::err_param_default_argument_references_param) 92 << Param->getDeclName() << DefaultArg->getSourceRange(); 93 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 94 // C++ [dcl.fct.default]p7 95 // Local variables shall not be used in default argument 96 // expressions. 97 if (VDecl->isLocalVarDecl()) 98 return S->Diag(DRE->getLocStart(), 99 diag::err_param_default_argument_references_local) 100 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 101 } 102 103 return false; 104 } 105 106 /// VisitCXXThisExpr - Visit a C++ "this" expression. 107 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 108 // C++ [dcl.fct.default]p8: 109 // The keyword this shall not be used in a default argument of a 110 // member function. 111 return S->Diag(ThisE->getLocStart(), 112 diag::err_param_default_argument_references_this) 113 << ThisE->getSourceRange(); 114 } 115 116 bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) { 117 // C++11 [expr.lambda.prim]p13: 118 // A lambda-expression appearing in a default argument shall not 119 // implicitly or explicitly capture any entity. 120 if (Lambda->capture_begin() == Lambda->capture_end()) 121 return false; 122 123 return S->Diag(Lambda->getLocStart(), 124 diag::err_lambda_capture_default_arg); 125 } 126} 127 128void Sema::ImplicitExceptionSpecification::CalledDecl(SourceLocation CallLoc, 129 CXXMethodDecl *Method) { 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 Proto = Self->ResolveExceptionSpec(CallLoc, Proto); 137 if (!Proto) 138 return; 139 140 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 141 142 // If this function can throw any exceptions, make a note of that. 143 if (EST == EST_Delayed || EST == EST_MSAny || EST == EST_None) { 144 ClearExceptions(); 145 ComputedEST = EST; 146 return; 147 } 148 149 // FIXME: If the call to this decl is using any of its default arguments, we 150 // need to search them for potentially-throwing calls. 151 152 // If this function has a basic noexcept, it doesn't affect the outcome. 153 if (EST == EST_BasicNoexcept) 154 return; 155 156 // If we have a throw-all spec at this point, ignore the function. 157 if (ComputedEST == EST_None) 158 return; 159 160 // If we're still at noexcept(true) and there's a nothrow() callee, 161 // change to that specification. 162 if (EST == EST_DynamicNone) { 163 if (ComputedEST == EST_BasicNoexcept) 164 ComputedEST = EST_DynamicNone; 165 return; 166 } 167 168 // Check out noexcept specs. 169 if (EST == EST_ComputedNoexcept) { 170 FunctionProtoType::NoexceptResult NR = 171 Proto->getNoexceptSpec(Self->Context); 172 assert(NR != FunctionProtoType::NR_NoNoexcept && 173 "Must have noexcept result for EST_ComputedNoexcept."); 174 assert(NR != FunctionProtoType::NR_Dependent && 175 "Should not generate implicit declarations for dependent cases, " 176 "and don't know how to handle them anyway."); 177 178 // noexcept(false) -> no spec on the new function 179 if (NR == FunctionProtoType::NR_Throw) { 180 ClearExceptions(); 181 ComputedEST = EST_None; 182 } 183 // noexcept(true) won't change anything either. 184 return; 185 } 186 187 assert(EST == EST_Dynamic && "EST case not considered earlier."); 188 assert(ComputedEST != EST_None && 189 "Shouldn't collect exceptions when throw-all is guaranteed."); 190 ComputedEST = EST_Dynamic; 191 // Record the exceptions in this function's exception specification. 192 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 193 EEnd = Proto->exception_end(); 194 E != EEnd; ++E) 195 if (ExceptionsSeen.insert(Self->Context.getCanonicalType(*E))) 196 Exceptions.push_back(*E); 197} 198 199void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 200 if (!E || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 201 return; 202 203 // FIXME: 204 // 205 // C++0x [except.spec]p14: 206 // [An] implicit exception-specification specifies the type-id T if and 207 // only if T is allowed by the exception-specification of a function directly 208 // invoked by f's implicit definition; f shall allow all exceptions if any 209 // function it directly invokes allows all exceptions, and f shall allow no 210 // exceptions if every function it directly invokes allows no exceptions. 211 // 212 // Note in particular that if an implicit exception-specification is generated 213 // for a function containing a throw-expression, that specification can still 214 // be noexcept(true). 215 // 216 // Note also that 'directly invoked' is not defined in the standard, and there 217 // is no indication that we should only consider potentially-evaluated calls. 218 // 219 // Ultimately we should implement the intent of the standard: the exception 220 // specification should be the set of exceptions which can be thrown by the 221 // implicit definition. For now, we assume that any non-nothrow expression can 222 // throw any exception. 223 224 if (Self->canThrow(E)) 225 ComputedEST = EST_None; 226} 227 228bool 229Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 230 SourceLocation EqualLoc) { 231 if (RequireCompleteType(Param->getLocation(), Param->getType(), 232 diag::err_typecheck_decl_incomplete_type)) { 233 Param->setInvalidDecl(); 234 return true; 235 } 236 237 // C++ [dcl.fct.default]p5 238 // A default argument expression is implicitly converted (clause 239 // 4) to the parameter type. The default argument expression has 240 // the same semantic constraints as the initializer expression in 241 // a declaration of a variable of the parameter type, using the 242 // copy-initialization semantics (8.5). 243 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 244 Param); 245 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 246 EqualLoc); 247 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 248 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 249 MultiExprArg(*this, &Arg, 1)); 250 if (Result.isInvalid()) 251 return true; 252 Arg = Result.takeAs<Expr>(); 253 254 CheckImplicitConversions(Arg, EqualLoc); 255 Arg = MaybeCreateExprWithCleanups(Arg); 256 257 // Okay: add the default argument to the parameter 258 Param->setDefaultArg(Arg); 259 260 // We have already instantiated this parameter; provide each of the 261 // instantiations with the uninstantiated default argument. 262 UnparsedDefaultArgInstantiationsMap::iterator InstPos 263 = UnparsedDefaultArgInstantiations.find(Param); 264 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 265 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 266 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 267 268 // We're done tracking this parameter's instantiations. 269 UnparsedDefaultArgInstantiations.erase(InstPos); 270 } 271 272 return false; 273} 274 275/// ActOnParamDefaultArgument - Check whether the default argument 276/// provided for a function parameter is well-formed. If so, attach it 277/// to the parameter declaration. 278void 279Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 280 Expr *DefaultArg) { 281 if (!param || !DefaultArg) 282 return; 283 284 ParmVarDecl *Param = cast<ParmVarDecl>(param); 285 UnparsedDefaultArgLocs.erase(Param); 286 287 // Default arguments are only permitted in C++ 288 if (!getLangOpts().CPlusPlus) { 289 Diag(EqualLoc, diag::err_param_default_argument) 290 << DefaultArg->getSourceRange(); 291 Param->setInvalidDecl(); 292 return; 293 } 294 295 // Check for unexpanded parameter packs. 296 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 297 Param->setInvalidDecl(); 298 return; 299 } 300 301 // Check that the default argument is well-formed 302 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 303 if (DefaultArgChecker.Visit(DefaultArg)) { 304 Param->setInvalidDecl(); 305 return; 306 } 307 308 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 309} 310 311/// ActOnParamUnparsedDefaultArgument - We've seen a default 312/// argument for a function parameter, but we can't parse it yet 313/// because we're inside a class definition. Note that this default 314/// argument will be parsed later. 315void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 316 SourceLocation EqualLoc, 317 SourceLocation ArgLoc) { 318 if (!param) 319 return; 320 321 ParmVarDecl *Param = cast<ParmVarDecl>(param); 322 if (Param) 323 Param->setUnparsedDefaultArg(); 324 325 UnparsedDefaultArgLocs[Param] = ArgLoc; 326} 327 328/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 329/// the default argument for the parameter param failed. 330void Sema::ActOnParamDefaultArgumentError(Decl *param) { 331 if (!param) 332 return; 333 334 ParmVarDecl *Param = cast<ParmVarDecl>(param); 335 336 Param->setInvalidDecl(); 337 338 UnparsedDefaultArgLocs.erase(Param); 339} 340 341/// CheckExtraCXXDefaultArguments - Check for any extra default 342/// arguments in the declarator, which is not a function declaration 343/// or definition and therefore is not permitted to have default 344/// arguments. This routine should be invoked for every declarator 345/// that is not a function declaration or definition. 346void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 347 // C++ [dcl.fct.default]p3 348 // A default argument expression shall be specified only in the 349 // parameter-declaration-clause of a function declaration or in a 350 // template-parameter (14.1). It shall not be specified for a 351 // parameter pack. If it is specified in a 352 // parameter-declaration-clause, it shall not occur within a 353 // declarator or abstract-declarator of a parameter-declaration. 354 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 355 DeclaratorChunk &chunk = D.getTypeObject(i); 356 if (chunk.Kind == DeclaratorChunk::Function) { 357 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 358 ParmVarDecl *Param = 359 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 360 if (Param->hasUnparsedDefaultArg()) { 361 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 362 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 363 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 364 delete Toks; 365 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 366 } else if (Param->getDefaultArg()) { 367 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 368 << Param->getDefaultArg()->getSourceRange(); 369 Param->setDefaultArg(0); 370 } 371 } 372 } 373 } 374} 375 376// MergeCXXFunctionDecl - Merge two declarations of the same C++ 377// function, once we already know that they have the same 378// type. Subroutine of MergeFunctionDecl. Returns true if there was an 379// error, false otherwise. 380bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old, 381 Scope *S) { 382 bool Invalid = false; 383 384 // C++ [dcl.fct.default]p4: 385 // For non-template functions, default arguments can be added in 386 // later declarations of a function in the same 387 // scope. Declarations in different scopes have completely 388 // distinct sets of default arguments. That is, declarations in 389 // inner scopes do not acquire default arguments from 390 // declarations in outer scopes, and vice versa. In a given 391 // function declaration, all parameters subsequent to a 392 // parameter with a default argument shall have default 393 // arguments supplied in this or previous declarations. A 394 // default argument shall not be redefined by a later 395 // declaration (not even to the same value). 396 // 397 // C++ [dcl.fct.default]p6: 398 // Except for member functions of class templates, the default arguments 399 // in a member function definition that appears outside of the class 400 // definition are added to the set of default arguments provided by the 401 // member function declaration in the class definition. 402 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 403 ParmVarDecl *OldParam = Old->getParamDecl(p); 404 ParmVarDecl *NewParam = New->getParamDecl(p); 405 406 bool OldParamHasDfl = OldParam->hasDefaultArg(); 407 bool NewParamHasDfl = NewParam->hasDefaultArg(); 408 409 NamedDecl *ND = Old; 410 if (S && !isDeclInScope(ND, New->getDeclContext(), S)) 411 // Ignore default parameters of old decl if they are not in 412 // the same scope. 413 OldParamHasDfl = false; 414 415 if (OldParamHasDfl && NewParamHasDfl) { 416 417 unsigned DiagDefaultParamID = 418 diag::err_param_default_argument_redefinition; 419 420 // MSVC accepts that default parameters be redefined for member functions 421 // of template class. The new default parameter's value is ignored. 422 Invalid = true; 423 if (getLangOpts().MicrosoftExt) { 424 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 425 if (MD && MD->getParent()->getDescribedClassTemplate()) { 426 // Merge the old default argument into the new parameter. 427 NewParam->setHasInheritedDefaultArg(); 428 if (OldParam->hasUninstantiatedDefaultArg()) 429 NewParam->setUninstantiatedDefaultArg( 430 OldParam->getUninstantiatedDefaultArg()); 431 else 432 NewParam->setDefaultArg(OldParam->getInit()); 433 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 434 Invalid = false; 435 } 436 } 437 438 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 439 // hint here. Alternatively, we could walk the type-source information 440 // for NewParam to find the last source location in the type... but it 441 // isn't worth the effort right now. This is the kind of test case that 442 // is hard to get right: 443 // int f(int); 444 // void g(int (*fp)(int) = f); 445 // void g(int (*fp)(int) = &f); 446 Diag(NewParam->getLocation(), DiagDefaultParamID) 447 << NewParam->getDefaultArgRange(); 448 449 // Look for the function declaration where the default argument was 450 // actually written, which may be a declaration prior to Old. 451 for (FunctionDecl *Older = Old->getPreviousDecl(); 452 Older; Older = Older->getPreviousDecl()) { 453 if (!Older->getParamDecl(p)->hasDefaultArg()) 454 break; 455 456 OldParam = Older->getParamDecl(p); 457 } 458 459 Diag(OldParam->getLocation(), diag::note_previous_definition) 460 << OldParam->getDefaultArgRange(); 461 } else if (OldParamHasDfl) { 462 // Merge the old default argument into the new parameter. 463 // It's important to use getInit() here; getDefaultArg() 464 // strips off any top-level ExprWithCleanups. 465 NewParam->setHasInheritedDefaultArg(); 466 if (OldParam->hasUninstantiatedDefaultArg()) 467 NewParam->setUninstantiatedDefaultArg( 468 OldParam->getUninstantiatedDefaultArg()); 469 else 470 NewParam->setDefaultArg(OldParam->getInit()); 471 } else if (NewParamHasDfl) { 472 if (New->getDescribedFunctionTemplate()) { 473 // Paragraph 4, quoted above, only applies to non-template functions. 474 Diag(NewParam->getLocation(), 475 diag::err_param_default_argument_template_redecl) 476 << NewParam->getDefaultArgRange(); 477 Diag(Old->getLocation(), diag::note_template_prev_declaration) 478 << false; 479 } else if (New->getTemplateSpecializationKind() 480 != TSK_ImplicitInstantiation && 481 New->getTemplateSpecializationKind() != TSK_Undeclared) { 482 // C++ [temp.expr.spec]p21: 483 // Default function arguments shall not be specified in a declaration 484 // or a definition for one of the following explicit specializations: 485 // - the explicit specialization of a function template; 486 // - the explicit specialization of a member function template; 487 // - the explicit specialization of a member function of a class 488 // template where the class template specialization to which the 489 // member function specialization belongs is implicitly 490 // instantiated. 491 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 492 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 493 << New->getDeclName() 494 << NewParam->getDefaultArgRange(); 495 } else if (New->getDeclContext()->isDependentContext()) { 496 // C++ [dcl.fct.default]p6 (DR217): 497 // Default arguments for a member function of a class template shall 498 // be specified on the initial declaration of the member function 499 // within the class template. 500 // 501 // Reading the tea leaves a bit in DR217 and its reference to DR205 502 // leads me to the conclusion that one cannot add default function 503 // arguments for an out-of-line definition of a member function of a 504 // dependent type. 505 int WhichKind = 2; 506 if (CXXRecordDecl *Record 507 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 508 if (Record->getDescribedClassTemplate()) 509 WhichKind = 0; 510 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 511 WhichKind = 1; 512 else 513 WhichKind = 2; 514 } 515 516 Diag(NewParam->getLocation(), 517 diag::err_param_default_argument_member_template_redecl) 518 << WhichKind 519 << NewParam->getDefaultArgRange(); 520 } else if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(New)) { 521 CXXSpecialMember NewSM = getSpecialMember(Ctor), 522 OldSM = getSpecialMember(cast<CXXConstructorDecl>(Old)); 523 if (NewSM != OldSM) { 524 Diag(NewParam->getLocation(),diag::warn_default_arg_makes_ctor_special) 525 << NewParam->getDefaultArgRange() << NewSM; 526 Diag(Old->getLocation(), diag::note_previous_declaration_special) 527 << OldSM; 528 } 529 } 530 } 531 } 532 533 // C++11 [dcl.constexpr]p1: If any declaration of a function or function 534 // template has a constexpr specifier then all its declarations shall 535 // contain the constexpr specifier. 536 if (New->isConstexpr() != Old->isConstexpr()) { 537 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 538 << New << New->isConstexpr(); 539 Diag(Old->getLocation(), diag::note_previous_declaration); 540 Invalid = true; 541 } 542 543 if (CheckEquivalentExceptionSpec(Old, New)) 544 Invalid = true; 545 546 return Invalid; 547} 548 549/// \brief Merge the exception specifications of two variable declarations. 550/// 551/// This is called when there's a redeclaration of a VarDecl. The function 552/// checks if the redeclaration might have an exception specification and 553/// validates compatibility and merges the specs if necessary. 554void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 555 // Shortcut if exceptions are disabled. 556 if (!getLangOpts().CXXExceptions) 557 return; 558 559 assert(Context.hasSameType(New->getType(), Old->getType()) && 560 "Should only be called if types are otherwise the same."); 561 562 QualType NewType = New->getType(); 563 QualType OldType = Old->getType(); 564 565 // We're only interested in pointers and references to functions, as well 566 // as pointers to member functions. 567 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 568 NewType = R->getPointeeType(); 569 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 570 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 571 NewType = P->getPointeeType(); 572 OldType = OldType->getAs<PointerType>()->getPointeeType(); 573 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 574 NewType = M->getPointeeType(); 575 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 576 } 577 578 if (!NewType->isFunctionProtoType()) 579 return; 580 581 // There's lots of special cases for functions. For function pointers, system 582 // libraries are hopefully not as broken so that we don't need these 583 // workarounds. 584 if (CheckEquivalentExceptionSpec( 585 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 586 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 587 New->setInvalidDecl(); 588 } 589} 590 591/// CheckCXXDefaultArguments - Verify that the default arguments for a 592/// function declaration are well-formed according to C++ 593/// [dcl.fct.default]. 594void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 595 unsigned NumParams = FD->getNumParams(); 596 unsigned p; 597 598 bool IsLambda = FD->getOverloadedOperator() == OO_Call && 599 isa<CXXMethodDecl>(FD) && 600 cast<CXXMethodDecl>(FD)->getParent()->isLambda(); 601 602 // Find first parameter with a default argument 603 for (p = 0; p < NumParams; ++p) { 604 ParmVarDecl *Param = FD->getParamDecl(p); 605 if (Param->hasDefaultArg()) { 606 // C++11 [expr.prim.lambda]p5: 607 // [...] Default arguments (8.3.6) shall not be specified in the 608 // parameter-declaration-clause of a lambda-declarator. 609 // 610 // FIXME: Core issue 974 strikes this sentence, we only provide an 611 // extension warning. 612 if (IsLambda) 613 Diag(Param->getLocation(), diag::ext_lambda_default_arguments) 614 << Param->getDefaultArgRange(); 615 break; 616 } 617 } 618 619 // C++ [dcl.fct.default]p4: 620 // In a given function declaration, all parameters 621 // subsequent to a parameter with a default argument shall 622 // have default arguments supplied in this or previous 623 // declarations. A default argument shall not be redefined 624 // by a later declaration (not even to the same value). 625 unsigned LastMissingDefaultArg = 0; 626 for (; p < NumParams; ++p) { 627 ParmVarDecl *Param = FD->getParamDecl(p); 628 if (!Param->hasDefaultArg()) { 629 if (Param->isInvalidDecl()) 630 /* We already complained about this parameter. */; 631 else if (Param->getIdentifier()) 632 Diag(Param->getLocation(), 633 diag::err_param_default_argument_missing_name) 634 << Param->getIdentifier(); 635 else 636 Diag(Param->getLocation(), 637 diag::err_param_default_argument_missing); 638 639 LastMissingDefaultArg = p; 640 } 641 } 642 643 if (LastMissingDefaultArg > 0) { 644 // Some default arguments were missing. Clear out all of the 645 // default arguments up to (and including) the last missing 646 // default argument, so that we leave the function parameters 647 // in a semantically valid state. 648 for (p = 0; p <= LastMissingDefaultArg; ++p) { 649 ParmVarDecl *Param = FD->getParamDecl(p); 650 if (Param->hasDefaultArg()) { 651 Param->setDefaultArg(0); 652 } 653 } 654 } 655} 656 657// CheckConstexprParameterTypes - Check whether a function's parameter types 658// are all literal types. If so, return true. If not, produce a suitable 659// diagnostic and return false. 660static bool CheckConstexprParameterTypes(Sema &SemaRef, 661 const FunctionDecl *FD) { 662 unsigned ArgIndex = 0; 663 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 664 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 665 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 666 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 667 SourceLocation ParamLoc = PD->getLocation(); 668 if (!(*i)->isDependentType() && 669 SemaRef.RequireLiteralType(ParamLoc, *i, 670 diag::err_constexpr_non_literal_param, 671 ArgIndex+1, PD->getSourceRange(), 672 isa<CXXConstructorDecl>(FD))) 673 return false; 674 } 675 return true; 676} 677 678// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 679// the requirements of a constexpr function definition or a constexpr 680// constructor definition. If so, return true. If not, produce appropriate 681// diagnostics and return false. 682// 683// This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. 684bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) { 685 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 686 if (MD && MD->isInstance()) { 687 // C++11 [dcl.constexpr]p4: 688 // The definition of a constexpr constructor shall satisfy the following 689 // constraints: 690 // - the class shall not have any virtual base classes; 691 const CXXRecordDecl *RD = MD->getParent(); 692 if (RD->getNumVBases()) { 693 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) 694 << isa<CXXConstructorDecl>(NewFD) << RD->isStruct() 695 << RD->getNumVBases(); 696 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 697 E = RD->vbases_end(); I != E; ++I) 698 Diag(I->getLocStart(), 699 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 700 return false; 701 } 702 } 703 704 if (!isa<CXXConstructorDecl>(NewFD)) { 705 // C++11 [dcl.constexpr]p3: 706 // The definition of a constexpr function shall satisfy the following 707 // constraints: 708 // - it shall not be virtual; 709 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 710 if (Method && Method->isVirtual()) { 711 Diag(NewFD->getLocation(), diag::err_constexpr_virtual); 712 713 // If it's not obvious why this function is virtual, find an overridden 714 // function which uses the 'virtual' keyword. 715 const CXXMethodDecl *WrittenVirtual = Method; 716 while (!WrittenVirtual->isVirtualAsWritten()) 717 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 718 if (WrittenVirtual != Method) 719 Diag(WrittenVirtual->getLocation(), 720 diag::note_overridden_virtual_function); 721 return false; 722 } 723 724 // - its return type shall be a literal type; 725 QualType RT = NewFD->getResultType(); 726 if (!RT->isDependentType() && 727 RequireLiteralType(NewFD->getLocation(), RT, 728 diag::err_constexpr_non_literal_return)) 729 return false; 730 } 731 732 // - each of its parameter types shall be a literal type; 733 if (!CheckConstexprParameterTypes(*this, NewFD)) 734 return false; 735 736 return true; 737} 738 739/// Check the given declaration statement is legal within a constexpr function 740/// body. C++0x [dcl.constexpr]p3,p4. 741/// 742/// \return true if the body is OK, false if we have diagnosed a problem. 743static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 744 DeclStmt *DS) { 745 // C++0x [dcl.constexpr]p3 and p4: 746 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 747 // contain only 748 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 749 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 750 switch ((*DclIt)->getKind()) { 751 case Decl::StaticAssert: 752 case Decl::Using: 753 case Decl::UsingShadow: 754 case Decl::UsingDirective: 755 case Decl::UnresolvedUsingTypename: 756 // - static_assert-declarations 757 // - using-declarations, 758 // - using-directives, 759 continue; 760 761 case Decl::Typedef: 762 case Decl::TypeAlias: { 763 // - typedef declarations and alias-declarations that do not define 764 // classes or enumerations, 765 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 766 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 767 // Don't allow variably-modified types in constexpr functions. 768 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 769 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 770 << TL.getSourceRange() << TL.getType() 771 << isa<CXXConstructorDecl>(Dcl); 772 return false; 773 } 774 continue; 775 } 776 777 case Decl::Enum: 778 case Decl::CXXRecord: 779 // As an extension, we allow the declaration (but not the definition) of 780 // classes and enumerations in all declarations, not just in typedef and 781 // alias declarations. 782 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 783 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 784 << isa<CXXConstructorDecl>(Dcl); 785 return false; 786 } 787 continue; 788 789 case Decl::Var: 790 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 791 << isa<CXXConstructorDecl>(Dcl); 792 return false; 793 794 default: 795 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 796 << isa<CXXConstructorDecl>(Dcl); 797 return false; 798 } 799 } 800 801 return true; 802} 803 804/// Check that the given field is initialized within a constexpr constructor. 805/// 806/// \param Dcl The constexpr constructor being checked. 807/// \param Field The field being checked. This may be a member of an anonymous 808/// struct or union nested within the class being checked. 809/// \param Inits All declarations, including anonymous struct/union members and 810/// indirect members, for which any initialization was provided. 811/// \param Diagnosed Set to true if an error is produced. 812static void CheckConstexprCtorInitializer(Sema &SemaRef, 813 const FunctionDecl *Dcl, 814 FieldDecl *Field, 815 llvm::SmallSet<Decl*, 16> &Inits, 816 bool &Diagnosed) { 817 if (Field->isUnnamedBitfield()) 818 return; 819 820 if (Field->isAnonymousStructOrUnion() && 821 Field->getType()->getAsCXXRecordDecl()->isEmpty()) 822 return; 823 824 if (!Inits.count(Field)) { 825 if (!Diagnosed) { 826 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 827 Diagnosed = true; 828 } 829 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 830 } else if (Field->isAnonymousStructOrUnion()) { 831 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 832 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 833 I != E; ++I) 834 // If an anonymous union contains an anonymous struct of which any member 835 // is initialized, all members must be initialized. 836 if (!RD->isUnion() || Inits.count(&*I)) 837 CheckConstexprCtorInitializer(SemaRef, Dcl, &*I, Inits, Diagnosed); 838 } 839} 840 841/// Check the body for the given constexpr function declaration only contains 842/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 843/// 844/// \return true if the body is OK, false if we have diagnosed a problem. 845bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 846 if (isa<CXXTryStmt>(Body)) { 847 // C++11 [dcl.constexpr]p3: 848 // The definition of a constexpr function shall satisfy the following 849 // constraints: [...] 850 // - its function-body shall be = delete, = default, or a 851 // compound-statement 852 // 853 // C++11 [dcl.constexpr]p4: 854 // In the definition of a constexpr constructor, [...] 855 // - its function-body shall not be a function-try-block; 856 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 857 << isa<CXXConstructorDecl>(Dcl); 858 return false; 859 } 860 861 // - its function-body shall be [...] a compound-statement that contains only 862 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 863 864 llvm::SmallVector<SourceLocation, 4> ReturnStmts; 865 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 866 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 867 switch ((*BodyIt)->getStmtClass()) { 868 case Stmt::NullStmtClass: 869 // - null statements, 870 continue; 871 872 case Stmt::DeclStmtClass: 873 // - static_assert-declarations 874 // - using-declarations, 875 // - using-directives, 876 // - typedef declarations and alias-declarations that do not define 877 // classes or enumerations, 878 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 879 return false; 880 continue; 881 882 case Stmt::ReturnStmtClass: 883 // - and exactly one return statement; 884 if (isa<CXXConstructorDecl>(Dcl)) 885 break; 886 887 ReturnStmts.push_back((*BodyIt)->getLocStart()); 888 continue; 889 890 default: 891 break; 892 } 893 894 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 895 << isa<CXXConstructorDecl>(Dcl); 896 return false; 897 } 898 899 if (const CXXConstructorDecl *Constructor 900 = dyn_cast<CXXConstructorDecl>(Dcl)) { 901 const CXXRecordDecl *RD = Constructor->getParent(); 902 // DR1359: 903 // - every non-variant non-static data member and base class sub-object 904 // shall be initialized; 905 // - if the class is a non-empty union, or for each non-empty anonymous 906 // union member of a non-union class, exactly one non-static data member 907 // shall be initialized; 908 if (RD->isUnion()) { 909 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) { 910 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 911 return false; 912 } 913 } else if (!Constructor->isDependentContext() && 914 !Constructor->isDelegatingConstructor()) { 915 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 916 917 // Skip detailed checking if we have enough initializers, and we would 918 // allow at most one initializer per member. 919 bool AnyAnonStructUnionMembers = false; 920 unsigned Fields = 0; 921 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 922 E = RD->field_end(); I != E; ++I, ++Fields) { 923 if (I->isAnonymousStructOrUnion()) { 924 AnyAnonStructUnionMembers = true; 925 break; 926 } 927 } 928 if (AnyAnonStructUnionMembers || 929 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 930 // Check initialization of non-static data members. Base classes are 931 // always initialized so do not need to be checked. Dependent bases 932 // might not have initializers in the member initializer list. 933 llvm::SmallSet<Decl*, 16> Inits; 934 for (CXXConstructorDecl::init_const_iterator 935 I = Constructor->init_begin(), E = Constructor->init_end(); 936 I != E; ++I) { 937 if (FieldDecl *FD = (*I)->getMember()) 938 Inits.insert(FD); 939 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 940 Inits.insert(ID->chain_begin(), ID->chain_end()); 941 } 942 943 bool Diagnosed = false; 944 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 945 E = RD->field_end(); I != E; ++I) 946 CheckConstexprCtorInitializer(*this, Dcl, &*I, Inits, Diagnosed); 947 if (Diagnosed) 948 return false; 949 } 950 } 951 } else { 952 if (ReturnStmts.empty()) { 953 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 954 return false; 955 } 956 if (ReturnStmts.size() > 1) { 957 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 958 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 959 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 960 return false; 961 } 962 } 963 964 // C++11 [dcl.constexpr]p5: 965 // if no function argument values exist such that the function invocation 966 // substitution would produce a constant expression, the program is 967 // ill-formed; no diagnostic required. 968 // C++11 [dcl.constexpr]p3: 969 // - every constructor call and implicit conversion used in initializing the 970 // return value shall be one of those allowed in a constant expression. 971 // C++11 [dcl.constexpr]p4: 972 // - every constructor involved in initializing non-static data members and 973 // base class sub-objects shall be a constexpr constructor. 974 llvm::SmallVector<PartialDiagnosticAt, 8> Diags; 975 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) { 976 Diag(Dcl->getLocation(), diag::err_constexpr_function_never_constant_expr) 977 << isa<CXXConstructorDecl>(Dcl); 978 for (size_t I = 0, N = Diags.size(); I != N; ++I) 979 Diag(Diags[I].first, Diags[I].second); 980 return false; 981 } 982 983 return true; 984} 985 986/// isCurrentClassName - Determine whether the identifier II is the 987/// name of the class type currently being defined. In the case of 988/// nested classes, this will only return true if II is the name of 989/// the innermost class. 990bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 991 const CXXScopeSpec *SS) { 992 assert(getLangOpts().CPlusPlus && "No class names in C!"); 993 994 CXXRecordDecl *CurDecl; 995 if (SS && SS->isSet() && !SS->isInvalid()) { 996 DeclContext *DC = computeDeclContext(*SS, true); 997 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 998 } else 999 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 1000 1001 if (CurDecl && CurDecl->getIdentifier()) 1002 return &II == CurDecl->getIdentifier(); 1003 else 1004 return false; 1005} 1006 1007/// \brief Check the validity of a C++ base class specifier. 1008/// 1009/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1010/// and returns NULL otherwise. 1011CXXBaseSpecifier * 1012Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1013 SourceRange SpecifierRange, 1014 bool Virtual, AccessSpecifier Access, 1015 TypeSourceInfo *TInfo, 1016 SourceLocation EllipsisLoc) { 1017 QualType BaseType = TInfo->getType(); 1018 1019 // C++ [class.union]p1: 1020 // A union shall not have base classes. 1021 if (Class->isUnion()) { 1022 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1023 << SpecifierRange; 1024 return 0; 1025 } 1026 1027 if (EllipsisLoc.isValid() && 1028 !TInfo->getType()->containsUnexpandedParameterPack()) { 1029 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1030 << TInfo->getTypeLoc().getSourceRange(); 1031 EllipsisLoc = SourceLocation(); 1032 } 1033 1034 if (BaseType->isDependentType()) 1035 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1036 Class->getTagKind() == TTK_Class, 1037 Access, TInfo, EllipsisLoc); 1038 1039 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1040 1041 // Base specifiers must be record types. 1042 if (!BaseType->isRecordType()) { 1043 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1044 return 0; 1045 } 1046 1047 // C++ [class.union]p1: 1048 // A union shall not be used as a base class. 1049 if (BaseType->isUnionType()) { 1050 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1051 return 0; 1052 } 1053 1054 // C++ [class.derived]p2: 1055 // The class-name in a base-specifier shall not be an incompletely 1056 // defined class. 1057 if (RequireCompleteType(BaseLoc, BaseType, 1058 diag::err_incomplete_base_class, SpecifierRange)) { 1059 Class->setInvalidDecl(); 1060 return 0; 1061 } 1062 1063 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1064 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1065 assert(BaseDecl && "Record type has no declaration"); 1066 BaseDecl = BaseDecl->getDefinition(); 1067 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1068 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1069 assert(CXXBaseDecl && "Base type is not a C++ type"); 1070 1071 // C++ [class]p3: 1072 // If a class is marked final and it appears as a base-type-specifier in 1073 // base-clause, the program is ill-formed. 1074 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1075 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1076 << CXXBaseDecl->getDeclName(); 1077 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1078 << CXXBaseDecl->getDeclName(); 1079 return 0; 1080 } 1081 1082 if (BaseDecl->isInvalidDecl()) 1083 Class->setInvalidDecl(); 1084 1085 // Create the base specifier. 1086 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1087 Class->getTagKind() == TTK_Class, 1088 Access, TInfo, EllipsisLoc); 1089} 1090 1091/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1092/// one entry in the base class list of a class specifier, for 1093/// example: 1094/// class foo : public bar, virtual private baz { 1095/// 'public bar' and 'virtual private baz' are each base-specifiers. 1096BaseResult 1097Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1098 bool Virtual, AccessSpecifier Access, 1099 ParsedType basetype, SourceLocation BaseLoc, 1100 SourceLocation EllipsisLoc) { 1101 if (!classdecl) 1102 return true; 1103 1104 AdjustDeclIfTemplate(classdecl); 1105 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1106 if (!Class) 1107 return true; 1108 1109 TypeSourceInfo *TInfo = 0; 1110 GetTypeFromParser(basetype, &TInfo); 1111 1112 if (EllipsisLoc.isInvalid() && 1113 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1114 UPPC_BaseType)) 1115 return true; 1116 1117 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1118 Virtual, Access, TInfo, 1119 EllipsisLoc)) 1120 return BaseSpec; 1121 1122 return true; 1123} 1124 1125/// \brief Performs the actual work of attaching the given base class 1126/// specifiers to a C++ class. 1127bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1128 unsigned NumBases) { 1129 if (NumBases == 0) 1130 return false; 1131 1132 // Used to keep track of which base types we have already seen, so 1133 // that we can properly diagnose redundant direct base types. Note 1134 // that the key is always the unqualified canonical type of the base 1135 // class. 1136 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1137 1138 // Copy non-redundant base specifiers into permanent storage. 1139 unsigned NumGoodBases = 0; 1140 bool Invalid = false; 1141 for (unsigned idx = 0; idx < NumBases; ++idx) { 1142 QualType NewBaseType 1143 = Context.getCanonicalType(Bases[idx]->getType()); 1144 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1145 1146 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; 1147 if (KnownBase) { 1148 // C++ [class.mi]p3: 1149 // A class shall not be specified as a direct base class of a 1150 // derived class more than once. 1151 Diag(Bases[idx]->getLocStart(), 1152 diag::err_duplicate_base_class) 1153 << KnownBase->getType() 1154 << Bases[idx]->getSourceRange(); 1155 1156 // Delete the duplicate base class specifier; we're going to 1157 // overwrite its pointer later. 1158 Context.Deallocate(Bases[idx]); 1159 1160 Invalid = true; 1161 } else { 1162 // Okay, add this new base class. 1163 KnownBase = Bases[idx]; 1164 Bases[NumGoodBases++] = Bases[idx]; 1165 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) 1166 if (const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl())) 1167 if (RD->hasAttr<WeakAttr>()) 1168 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1169 } 1170 } 1171 1172 // Attach the remaining base class specifiers to the derived class. 1173 Class->setBases(Bases, NumGoodBases); 1174 1175 // Delete the remaining (good) base class specifiers, since their 1176 // data has been copied into the CXXRecordDecl. 1177 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1178 Context.Deallocate(Bases[idx]); 1179 1180 return Invalid; 1181} 1182 1183/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1184/// class, after checking whether there are any duplicate base 1185/// classes. 1186void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1187 unsigned NumBases) { 1188 if (!ClassDecl || !Bases || !NumBases) 1189 return; 1190 1191 AdjustDeclIfTemplate(ClassDecl); 1192 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1193 (CXXBaseSpecifier**)(Bases), NumBases); 1194} 1195 1196static CXXRecordDecl *GetClassForType(QualType T) { 1197 if (const RecordType *RT = T->getAs<RecordType>()) 1198 return cast<CXXRecordDecl>(RT->getDecl()); 1199 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1200 return ICT->getDecl(); 1201 else 1202 return 0; 1203} 1204 1205/// \brief Determine whether the type \p Derived is a C++ class that is 1206/// derived from the type \p Base. 1207bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1208 if (!getLangOpts().CPlusPlus) 1209 return false; 1210 1211 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1212 if (!DerivedRD) 1213 return false; 1214 1215 CXXRecordDecl *BaseRD = GetClassForType(Base); 1216 if (!BaseRD) 1217 return false; 1218 1219 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1220 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1221} 1222 1223/// \brief Determine whether the type \p Derived is a C++ class that is 1224/// derived from the type \p Base. 1225bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1226 if (!getLangOpts().CPlusPlus) 1227 return false; 1228 1229 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1230 if (!DerivedRD) 1231 return false; 1232 1233 CXXRecordDecl *BaseRD = GetClassForType(Base); 1234 if (!BaseRD) 1235 return false; 1236 1237 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1238} 1239 1240void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1241 CXXCastPath &BasePathArray) { 1242 assert(BasePathArray.empty() && "Base path array must be empty!"); 1243 assert(Paths.isRecordingPaths() && "Must record paths!"); 1244 1245 const CXXBasePath &Path = Paths.front(); 1246 1247 // We first go backward and check if we have a virtual base. 1248 // FIXME: It would be better if CXXBasePath had the base specifier for 1249 // the nearest virtual base. 1250 unsigned Start = 0; 1251 for (unsigned I = Path.size(); I != 0; --I) { 1252 if (Path[I - 1].Base->isVirtual()) { 1253 Start = I - 1; 1254 break; 1255 } 1256 } 1257 1258 // Now add all bases. 1259 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1260 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1261} 1262 1263/// \brief Determine whether the given base path includes a virtual 1264/// base class. 1265bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1266 for (CXXCastPath::const_iterator B = BasePath.begin(), 1267 BEnd = BasePath.end(); 1268 B != BEnd; ++B) 1269 if ((*B)->isVirtual()) 1270 return true; 1271 1272 return false; 1273} 1274 1275/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1276/// conversion (where Derived and Base are class types) is 1277/// well-formed, meaning that the conversion is unambiguous (and 1278/// that all of the base classes are accessible). Returns true 1279/// and emits a diagnostic if the code is ill-formed, returns false 1280/// otherwise. Loc is the location where this routine should point to 1281/// if there is an error, and Range is the source range to highlight 1282/// if there is an error. 1283bool 1284Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1285 unsigned InaccessibleBaseID, 1286 unsigned AmbigiousBaseConvID, 1287 SourceLocation Loc, SourceRange Range, 1288 DeclarationName Name, 1289 CXXCastPath *BasePath) { 1290 // First, determine whether the path from Derived to Base is 1291 // ambiguous. This is slightly more expensive than checking whether 1292 // the Derived to Base conversion exists, because here we need to 1293 // explore multiple paths to determine if there is an ambiguity. 1294 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1295 /*DetectVirtual=*/false); 1296 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1297 assert(DerivationOkay && 1298 "Can only be used with a derived-to-base conversion"); 1299 (void)DerivationOkay; 1300 1301 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1302 if (InaccessibleBaseID) { 1303 // Check that the base class can be accessed. 1304 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1305 InaccessibleBaseID)) { 1306 case AR_inaccessible: 1307 return true; 1308 case AR_accessible: 1309 case AR_dependent: 1310 case AR_delayed: 1311 break; 1312 } 1313 } 1314 1315 // Build a base path if necessary. 1316 if (BasePath) 1317 BuildBasePathArray(Paths, *BasePath); 1318 return false; 1319 } 1320 1321 // We know that the derived-to-base conversion is ambiguous, and 1322 // we're going to produce a diagnostic. Perform the derived-to-base 1323 // search just one more time to compute all of the possible paths so 1324 // that we can print them out. This is more expensive than any of 1325 // the previous derived-to-base checks we've done, but at this point 1326 // performance isn't as much of an issue. 1327 Paths.clear(); 1328 Paths.setRecordingPaths(true); 1329 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1330 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1331 (void)StillOkay; 1332 1333 // Build up a textual representation of the ambiguous paths, e.g., 1334 // D -> B -> A, that will be used to illustrate the ambiguous 1335 // conversions in the diagnostic. We only print one of the paths 1336 // to each base class subobject. 1337 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1338 1339 Diag(Loc, AmbigiousBaseConvID) 1340 << Derived << Base << PathDisplayStr << Range << Name; 1341 return true; 1342} 1343 1344bool 1345Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1346 SourceLocation Loc, SourceRange Range, 1347 CXXCastPath *BasePath, 1348 bool IgnoreAccess) { 1349 return CheckDerivedToBaseConversion(Derived, Base, 1350 IgnoreAccess ? 0 1351 : diag::err_upcast_to_inaccessible_base, 1352 diag::err_ambiguous_derived_to_base_conv, 1353 Loc, Range, DeclarationName(), 1354 BasePath); 1355} 1356 1357 1358/// @brief Builds a string representing ambiguous paths from a 1359/// specific derived class to different subobjects of the same base 1360/// class. 1361/// 1362/// This function builds a string that can be used in error messages 1363/// to show the different paths that one can take through the 1364/// inheritance hierarchy to go from the derived class to different 1365/// subobjects of a base class. The result looks something like this: 1366/// @code 1367/// struct D -> struct B -> struct A 1368/// struct D -> struct C -> struct A 1369/// @endcode 1370std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1371 std::string PathDisplayStr; 1372 std::set<unsigned> DisplayedPaths; 1373 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1374 Path != Paths.end(); ++Path) { 1375 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1376 // We haven't displayed a path to this particular base 1377 // class subobject yet. 1378 PathDisplayStr += "\n "; 1379 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1380 for (CXXBasePath::const_iterator Element = Path->begin(); 1381 Element != Path->end(); ++Element) 1382 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1383 } 1384 } 1385 1386 return PathDisplayStr; 1387} 1388 1389//===----------------------------------------------------------------------===// 1390// C++ class member Handling 1391//===----------------------------------------------------------------------===// 1392 1393/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1394bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1395 SourceLocation ASLoc, 1396 SourceLocation ColonLoc, 1397 AttributeList *Attrs) { 1398 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1399 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1400 ASLoc, ColonLoc); 1401 CurContext->addHiddenDecl(ASDecl); 1402 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1403} 1404 1405/// CheckOverrideControl - Check C++0x override control semantics. 1406void Sema::CheckOverrideControl(const Decl *D) { 1407 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1408 if (!MD || !MD->isVirtual()) 1409 return; 1410 1411 if (MD->isDependentContext()) 1412 return; 1413 1414 // C++0x [class.virtual]p3: 1415 // If a virtual function is marked with the virt-specifier override and does 1416 // not override a member function of a base class, 1417 // the program is ill-formed. 1418 bool HasOverriddenMethods = 1419 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1420 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1421 Diag(MD->getLocation(), 1422 diag::err_function_marked_override_not_overriding) 1423 << MD->getDeclName(); 1424 return; 1425 } 1426} 1427 1428/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1429/// function overrides a virtual member function marked 'final', according to 1430/// C++0x [class.virtual]p3. 1431bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1432 const CXXMethodDecl *Old) { 1433 if (!Old->hasAttr<FinalAttr>()) 1434 return false; 1435 1436 Diag(New->getLocation(), diag::err_final_function_overridden) 1437 << New->getDeclName(); 1438 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1439 return true; 1440} 1441 1442/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1443/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1444/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1445/// one has been parsed, and 'HasDeferredInit' is true if an initializer is 1446/// present but parsing it has been deferred. 1447Decl * 1448Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1449 MultiTemplateParamsArg TemplateParameterLists, 1450 Expr *BW, const VirtSpecifiers &VS, 1451 bool HasDeferredInit) { 1452 const DeclSpec &DS = D.getDeclSpec(); 1453 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1454 DeclarationName Name = NameInfo.getName(); 1455 SourceLocation Loc = NameInfo.getLoc(); 1456 1457 // For anonymous bitfields, the location should point to the type. 1458 if (Loc.isInvalid()) 1459 Loc = D.getLocStart(); 1460 1461 Expr *BitWidth = static_cast<Expr*>(BW); 1462 1463 assert(isa<CXXRecordDecl>(CurContext)); 1464 assert(!DS.isFriendSpecified()); 1465 1466 bool isFunc = D.isDeclarationOfFunction(); 1467 1468 // C++ 9.2p6: A member shall not be declared to have automatic storage 1469 // duration (auto, register) or with the extern storage-class-specifier. 1470 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1471 // data members and cannot be applied to names declared const or static, 1472 // and cannot be applied to reference members. 1473 switch (DS.getStorageClassSpec()) { 1474 case DeclSpec::SCS_unspecified: 1475 case DeclSpec::SCS_typedef: 1476 case DeclSpec::SCS_static: 1477 // FALL THROUGH. 1478 break; 1479 case DeclSpec::SCS_mutable: 1480 if (isFunc) { 1481 if (DS.getStorageClassSpecLoc().isValid()) 1482 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1483 else 1484 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1485 1486 // FIXME: It would be nicer if the keyword was ignored only for this 1487 // declarator. Otherwise we could get follow-up errors. 1488 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1489 } 1490 break; 1491 default: 1492 if (DS.getStorageClassSpecLoc().isValid()) 1493 Diag(DS.getStorageClassSpecLoc(), 1494 diag::err_storageclass_invalid_for_member); 1495 else 1496 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1497 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1498 } 1499 1500 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1501 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1502 !isFunc); 1503 1504 Decl *Member; 1505 if (isInstField) { 1506 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1507 1508 // Data members must have identifiers for names. 1509 if (Name.getNameKind() != DeclarationName::Identifier) { 1510 Diag(Loc, diag::err_bad_variable_name) 1511 << Name; 1512 return 0; 1513 } 1514 1515 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1516 1517 // Member field could not be with "template" keyword. 1518 // So TemplateParameterLists should be empty in this case. 1519 if (TemplateParameterLists.size()) { 1520 TemplateParameterList* TemplateParams = TemplateParameterLists.get()[0]; 1521 if (TemplateParams->size()) { 1522 // There is no such thing as a member field template. 1523 Diag(D.getIdentifierLoc(), diag::err_template_member) 1524 << II 1525 << SourceRange(TemplateParams->getTemplateLoc(), 1526 TemplateParams->getRAngleLoc()); 1527 } else { 1528 // There is an extraneous 'template<>' for this member. 1529 Diag(TemplateParams->getTemplateLoc(), 1530 diag::err_template_member_noparams) 1531 << II 1532 << SourceRange(TemplateParams->getTemplateLoc(), 1533 TemplateParams->getRAngleLoc()); 1534 } 1535 return 0; 1536 } 1537 1538 if (SS.isSet() && !SS.isInvalid()) { 1539 // The user provided a superfluous scope specifier inside a class 1540 // definition: 1541 // 1542 // class X { 1543 // int X::member; 1544 // }; 1545 if (DeclContext *DC = computeDeclContext(SS, false)) 1546 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc()); 1547 else 1548 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1549 << Name << SS.getRange(); 1550 1551 SS.clear(); 1552 } 1553 1554 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1555 HasDeferredInit, AS); 1556 assert(Member && "HandleField never returns null"); 1557 } else { 1558 assert(!HasDeferredInit); 1559 1560 Member = HandleDeclarator(S, D, move(TemplateParameterLists)); 1561 if (!Member) { 1562 return 0; 1563 } 1564 1565 // Non-instance-fields can't have a bitfield. 1566 if (BitWidth) { 1567 if (Member->isInvalidDecl()) { 1568 // don't emit another diagnostic. 1569 } else if (isa<VarDecl>(Member)) { 1570 // C++ 9.6p3: A bit-field shall not be a static member. 1571 // "static member 'A' cannot be a bit-field" 1572 Diag(Loc, diag::err_static_not_bitfield) 1573 << Name << BitWidth->getSourceRange(); 1574 } else if (isa<TypedefDecl>(Member)) { 1575 // "typedef member 'x' cannot be a bit-field" 1576 Diag(Loc, diag::err_typedef_not_bitfield) 1577 << Name << BitWidth->getSourceRange(); 1578 } else { 1579 // A function typedef ("typedef int f(); f a;"). 1580 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1581 Diag(Loc, diag::err_not_integral_type_bitfield) 1582 << Name << cast<ValueDecl>(Member)->getType() 1583 << BitWidth->getSourceRange(); 1584 } 1585 1586 BitWidth = 0; 1587 Member->setInvalidDecl(); 1588 } 1589 1590 Member->setAccess(AS); 1591 1592 // If we have declared a member function template, set the access of the 1593 // templated declaration as well. 1594 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1595 FunTmpl->getTemplatedDecl()->setAccess(AS); 1596 } 1597 1598 if (VS.isOverrideSpecified()) { 1599 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1600 if (!MD || !MD->isVirtual()) { 1601 Diag(Member->getLocStart(), 1602 diag::override_keyword_only_allowed_on_virtual_member_functions) 1603 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1604 } else 1605 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1606 } 1607 if (VS.isFinalSpecified()) { 1608 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1609 if (!MD || !MD->isVirtual()) { 1610 Diag(Member->getLocStart(), 1611 diag::override_keyword_only_allowed_on_virtual_member_functions) 1612 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1613 } else 1614 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1615 } 1616 1617 if (VS.getLastLocation().isValid()) { 1618 // Update the end location of a method that has a virt-specifiers. 1619 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1620 MD->setRangeEnd(VS.getLastLocation()); 1621 } 1622 1623 CheckOverrideControl(Member); 1624 1625 assert((Name || isInstField) && "No identifier for non-field ?"); 1626 1627 if (isInstField) 1628 FieldCollector->Add(cast<FieldDecl>(Member)); 1629 return Member; 1630} 1631 1632/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1633/// in-class initializer for a non-static C++ class member, and after 1634/// instantiating an in-class initializer in a class template. Such actions 1635/// are deferred until the class is complete. 1636void 1637Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation EqualLoc, 1638 Expr *InitExpr) { 1639 FieldDecl *FD = cast<FieldDecl>(D); 1640 1641 if (!InitExpr) { 1642 FD->setInvalidDecl(); 1643 FD->removeInClassInitializer(); 1644 return; 1645 } 1646 1647 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1648 FD->setInvalidDecl(); 1649 FD->removeInClassInitializer(); 1650 return; 1651 } 1652 1653 ExprResult Init = InitExpr; 1654 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1655 if (isa<InitListExpr>(InitExpr) && isStdInitializerList(FD->getType(), 0)) { 1656 Diag(FD->getLocation(), diag::warn_dangling_std_initializer_list) 1657 << /*at end of ctor*/1 << InitExpr->getSourceRange(); 1658 } 1659 Expr **Inits = &InitExpr; 1660 unsigned NumInits = 1; 1661 InitializedEntity Entity = InitializedEntity::InitializeMember(FD); 1662 InitializationKind Kind = EqualLoc.isInvalid() 1663 ? InitializationKind::CreateDirectList(InitExpr->getLocStart()) 1664 : InitializationKind::CreateCopy(InitExpr->getLocStart(), EqualLoc); 1665 InitializationSequence Seq(*this, Entity, Kind, Inits, NumInits); 1666 Init = Seq.Perform(*this, Entity, Kind, MultiExprArg(Inits, NumInits)); 1667 if (Init.isInvalid()) { 1668 FD->setInvalidDecl(); 1669 return; 1670 } 1671 1672 CheckImplicitConversions(Init.get(), EqualLoc); 1673 } 1674 1675 // C++0x [class.base.init]p7: 1676 // The initialization of each base and member constitutes a 1677 // full-expression. 1678 Init = MaybeCreateExprWithCleanups(Init); 1679 if (Init.isInvalid()) { 1680 FD->setInvalidDecl(); 1681 return; 1682 } 1683 1684 InitExpr = Init.release(); 1685 1686 FD->setInClassInitializer(InitExpr); 1687} 1688 1689/// \brief Find the direct and/or virtual base specifiers that 1690/// correspond to the given base type, for use in base initialization 1691/// within a constructor. 1692static bool FindBaseInitializer(Sema &SemaRef, 1693 CXXRecordDecl *ClassDecl, 1694 QualType BaseType, 1695 const CXXBaseSpecifier *&DirectBaseSpec, 1696 const CXXBaseSpecifier *&VirtualBaseSpec) { 1697 // First, check for a direct base class. 1698 DirectBaseSpec = 0; 1699 for (CXXRecordDecl::base_class_const_iterator Base 1700 = ClassDecl->bases_begin(); 1701 Base != ClassDecl->bases_end(); ++Base) { 1702 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1703 // We found a direct base of this type. That's what we're 1704 // initializing. 1705 DirectBaseSpec = &*Base; 1706 break; 1707 } 1708 } 1709 1710 // Check for a virtual base class. 1711 // FIXME: We might be able to short-circuit this if we know in advance that 1712 // there are no virtual bases. 1713 VirtualBaseSpec = 0; 1714 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1715 // We haven't found a base yet; search the class hierarchy for a 1716 // virtual base class. 1717 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1718 /*DetectVirtual=*/false); 1719 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1720 BaseType, Paths)) { 1721 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1722 Path != Paths.end(); ++Path) { 1723 if (Path->back().Base->isVirtual()) { 1724 VirtualBaseSpec = Path->back().Base; 1725 break; 1726 } 1727 } 1728 } 1729 } 1730 1731 return DirectBaseSpec || VirtualBaseSpec; 1732} 1733 1734/// \brief Handle a C++ member initializer using braced-init-list syntax. 1735MemInitResult 1736Sema::ActOnMemInitializer(Decl *ConstructorD, 1737 Scope *S, 1738 CXXScopeSpec &SS, 1739 IdentifierInfo *MemberOrBase, 1740 ParsedType TemplateTypeTy, 1741 const DeclSpec &DS, 1742 SourceLocation IdLoc, 1743 Expr *InitList, 1744 SourceLocation EllipsisLoc) { 1745 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1746 DS, IdLoc, InitList, 1747 EllipsisLoc); 1748} 1749 1750/// \brief Handle a C++ member initializer using parentheses syntax. 1751MemInitResult 1752Sema::ActOnMemInitializer(Decl *ConstructorD, 1753 Scope *S, 1754 CXXScopeSpec &SS, 1755 IdentifierInfo *MemberOrBase, 1756 ParsedType TemplateTypeTy, 1757 const DeclSpec &DS, 1758 SourceLocation IdLoc, 1759 SourceLocation LParenLoc, 1760 Expr **Args, unsigned NumArgs, 1761 SourceLocation RParenLoc, 1762 SourceLocation EllipsisLoc) { 1763 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1764 RParenLoc); 1765 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1766 DS, IdLoc, List, EllipsisLoc); 1767} 1768 1769namespace { 1770 1771// Callback to only accept typo corrections that can be a valid C++ member 1772// intializer: either a non-static field member or a base class. 1773class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 1774 public: 1775 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 1776 : ClassDecl(ClassDecl) {} 1777 1778 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 1779 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 1780 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 1781 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 1782 else 1783 return isa<TypeDecl>(ND); 1784 } 1785 return false; 1786 } 1787 1788 private: 1789 CXXRecordDecl *ClassDecl; 1790}; 1791 1792} 1793 1794/// \brief Handle a C++ member initializer. 1795MemInitResult 1796Sema::BuildMemInitializer(Decl *ConstructorD, 1797 Scope *S, 1798 CXXScopeSpec &SS, 1799 IdentifierInfo *MemberOrBase, 1800 ParsedType TemplateTypeTy, 1801 const DeclSpec &DS, 1802 SourceLocation IdLoc, 1803 Expr *Init, 1804 SourceLocation EllipsisLoc) { 1805 if (!ConstructorD) 1806 return true; 1807 1808 AdjustDeclIfTemplate(ConstructorD); 1809 1810 CXXConstructorDecl *Constructor 1811 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1812 if (!Constructor) { 1813 // The user wrote a constructor initializer on a function that is 1814 // not a C++ constructor. Ignore the error for now, because we may 1815 // have more member initializers coming; we'll diagnose it just 1816 // once in ActOnMemInitializers. 1817 return true; 1818 } 1819 1820 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1821 1822 // C++ [class.base.init]p2: 1823 // Names in a mem-initializer-id are looked up in the scope of the 1824 // constructor's class and, if not found in that scope, are looked 1825 // up in the scope containing the constructor's definition. 1826 // [Note: if the constructor's class contains a member with the 1827 // same name as a direct or virtual base class of the class, a 1828 // mem-initializer-id naming the member or base class and composed 1829 // of a single identifier refers to the class member. A 1830 // mem-initializer-id for the hidden base class may be specified 1831 // using a qualified name. ] 1832 if (!SS.getScopeRep() && !TemplateTypeTy) { 1833 // Look for a member, first. 1834 DeclContext::lookup_result Result 1835 = ClassDecl->lookup(MemberOrBase); 1836 if (Result.first != Result.second) { 1837 ValueDecl *Member; 1838 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 1839 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 1840 if (EllipsisLoc.isValid()) 1841 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1842 << MemberOrBase 1843 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 1844 1845 return BuildMemberInitializer(Member, Init, IdLoc); 1846 } 1847 } 1848 } 1849 // It didn't name a member, so see if it names a class. 1850 QualType BaseType; 1851 TypeSourceInfo *TInfo = 0; 1852 1853 if (TemplateTypeTy) { 1854 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1855 } else if (DS.getTypeSpecType() == TST_decltype) { 1856 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 1857 } else { 1858 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1859 LookupParsedName(R, S, &SS); 1860 1861 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1862 if (!TyD) { 1863 if (R.isAmbiguous()) return true; 1864 1865 // We don't want access-control diagnostics here. 1866 R.suppressDiagnostics(); 1867 1868 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1869 bool NotUnknownSpecialization = false; 1870 DeclContext *DC = computeDeclContext(SS, false); 1871 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1872 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1873 1874 if (!NotUnknownSpecialization) { 1875 // When the scope specifier can refer to a member of an unknown 1876 // specialization, we take it as a type name. 1877 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1878 SS.getWithLocInContext(Context), 1879 *MemberOrBase, IdLoc); 1880 if (BaseType.isNull()) 1881 return true; 1882 1883 R.clear(); 1884 R.setLookupName(MemberOrBase); 1885 } 1886 } 1887 1888 // If no results were found, try to correct typos. 1889 TypoCorrection Corr; 1890 MemInitializerValidatorCCC Validator(ClassDecl); 1891 if (R.empty() && BaseType.isNull() && 1892 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1893 Validator, ClassDecl))) { 1894 std::string CorrectedStr(Corr.getAsString(getLangOpts())); 1895 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOpts())); 1896 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1897 // We have found a non-static data member with a similar 1898 // name to what was typed; complain and initialize that 1899 // member. 1900 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1901 << MemberOrBase << true << CorrectedQuotedStr 1902 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1903 Diag(Member->getLocation(), diag::note_previous_decl) 1904 << CorrectedQuotedStr; 1905 1906 return BuildMemberInitializer(Member, Init, IdLoc); 1907 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1908 const CXXBaseSpecifier *DirectBaseSpec; 1909 const CXXBaseSpecifier *VirtualBaseSpec; 1910 if (FindBaseInitializer(*this, ClassDecl, 1911 Context.getTypeDeclType(Type), 1912 DirectBaseSpec, VirtualBaseSpec)) { 1913 // We have found a direct or virtual base class with a 1914 // similar name to what was typed; complain and initialize 1915 // that base class. 1916 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1917 << MemberOrBase << false << CorrectedQuotedStr 1918 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1919 1920 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1921 : VirtualBaseSpec; 1922 Diag(BaseSpec->getLocStart(), 1923 diag::note_base_class_specified_here) 1924 << BaseSpec->getType() 1925 << BaseSpec->getSourceRange(); 1926 1927 TyD = Type; 1928 } 1929 } 1930 } 1931 1932 if (!TyD && BaseType.isNull()) { 1933 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1934 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 1935 return true; 1936 } 1937 } 1938 1939 if (BaseType.isNull()) { 1940 BaseType = Context.getTypeDeclType(TyD); 1941 if (SS.isSet()) { 1942 NestedNameSpecifier *Qualifier = 1943 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1944 1945 // FIXME: preserve source range information 1946 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1947 } 1948 } 1949 } 1950 1951 if (!TInfo) 1952 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1953 1954 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 1955} 1956 1957/// Checks a member initializer expression for cases where reference (or 1958/// pointer) members are bound to by-value parameters (or their addresses). 1959static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 1960 Expr *Init, 1961 SourceLocation IdLoc) { 1962 QualType MemberTy = Member->getType(); 1963 1964 // We only handle pointers and references currently. 1965 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 1966 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 1967 return; 1968 1969 const bool IsPointer = MemberTy->isPointerType(); 1970 if (IsPointer) { 1971 if (const UnaryOperator *Op 1972 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 1973 // The only case we're worried about with pointers requires taking the 1974 // address. 1975 if (Op->getOpcode() != UO_AddrOf) 1976 return; 1977 1978 Init = Op->getSubExpr(); 1979 } else { 1980 // We only handle address-of expression initializers for pointers. 1981 return; 1982 } 1983 } 1984 1985 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 1986 // Taking the address of a temporary will be diagnosed as a hard error. 1987 if (IsPointer) 1988 return; 1989 1990 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 1991 << Member << Init->getSourceRange(); 1992 } else if (const DeclRefExpr *DRE 1993 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 1994 // We only warn when referring to a non-reference parameter declaration. 1995 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 1996 if (!Parameter || Parameter->getType()->isReferenceType()) 1997 return; 1998 1999 S.Diag(Init->getExprLoc(), 2000 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 2001 : diag::warn_bind_ref_member_to_parameter) 2002 << Member << Parameter << Init->getSourceRange(); 2003 } else { 2004 // Other initializers are fine. 2005 return; 2006 } 2007 2008 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 2009 << (unsigned)IsPointer; 2010} 2011 2012/// Checks an initializer expression for use of uninitialized fields, such as 2013/// containing the field that is being initialized. Returns true if there is an 2014/// uninitialized field was used an updates the SourceLocation parameter; false 2015/// otherwise. 2016static bool InitExprContainsUninitializedFields(const Stmt *S, 2017 const ValueDecl *LhsField, 2018 SourceLocation *L) { 2019 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 2020 2021 if (isa<CallExpr>(S)) { 2022 // Do not descend into function calls or constructors, as the use 2023 // of an uninitialized field may be valid. One would have to inspect 2024 // the contents of the function/ctor to determine if it is safe or not. 2025 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 2026 // may be safe, depending on what the function/ctor does. 2027 return false; 2028 } 2029 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 2030 const NamedDecl *RhsField = ME->getMemberDecl(); 2031 2032 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 2033 // The member expression points to a static data member. 2034 assert(VD->isStaticDataMember() && 2035 "Member points to non-static data member!"); 2036 (void)VD; 2037 return false; 2038 } 2039 2040 if (isa<EnumConstantDecl>(RhsField)) { 2041 // The member expression points to an enum. 2042 return false; 2043 } 2044 2045 if (RhsField == LhsField) { 2046 // Initializing a field with itself. Throw a warning. 2047 // But wait; there are exceptions! 2048 // Exception #1: The field may not belong to this record. 2049 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 2050 const Expr *base = ME->getBase(); 2051 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 2052 // Even though the field matches, it does not belong to this record. 2053 return false; 2054 } 2055 // None of the exceptions triggered; return true to indicate an 2056 // uninitialized field was used. 2057 *L = ME->getMemberLoc(); 2058 return true; 2059 } 2060 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 2061 // sizeof/alignof doesn't reference contents, do not warn. 2062 return false; 2063 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 2064 // address-of doesn't reference contents (the pointer may be dereferenced 2065 // in the same expression but it would be rare; and weird). 2066 if (UOE->getOpcode() == UO_AddrOf) 2067 return false; 2068 } 2069 for (Stmt::const_child_range it = S->children(); it; ++it) { 2070 if (!*it) { 2071 // An expression such as 'member(arg ?: "")' may trigger this. 2072 continue; 2073 } 2074 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 2075 return true; 2076 } 2077 return false; 2078} 2079 2080MemInitResult 2081Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2082 SourceLocation IdLoc) { 2083 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2084 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2085 assert((DirectMember || IndirectMember) && 2086 "Member must be a FieldDecl or IndirectFieldDecl"); 2087 2088 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2089 return true; 2090 2091 if (Member->isInvalidDecl()) 2092 return true; 2093 2094 // Diagnose value-uses of fields to initialize themselves, e.g. 2095 // foo(foo) 2096 // where foo is not also a parameter to the constructor. 2097 // TODO: implement -Wuninitialized and fold this into that framework. 2098 Expr **Args; 2099 unsigned NumArgs; 2100 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2101 Args = ParenList->getExprs(); 2102 NumArgs = ParenList->getNumExprs(); 2103 } else { 2104 InitListExpr *InitList = cast<InitListExpr>(Init); 2105 Args = InitList->getInits(); 2106 NumArgs = InitList->getNumInits(); 2107 } 2108 for (unsigned i = 0; i < NumArgs; ++i) { 2109 SourceLocation L; 2110 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 2111 // FIXME: Return true in the case when other fields are used before being 2112 // uninitialized. For example, let this field be the i'th field. When 2113 // initializing the i'th field, throw a warning if any of the >= i'th 2114 // fields are used, as they are not yet initialized. 2115 // Right now we are only handling the case where the i'th field uses 2116 // itself in its initializer. 2117 Diag(L, diag::warn_field_is_uninit); 2118 } 2119 } 2120 2121 SourceRange InitRange = Init->getSourceRange(); 2122 2123 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2124 // Can't check initialization for a member of dependent type or when 2125 // any of the arguments are type-dependent expressions. 2126 DiscardCleanupsInEvaluationContext(); 2127 } else { 2128 bool InitList = false; 2129 if (isa<InitListExpr>(Init)) { 2130 InitList = true; 2131 Args = &Init; 2132 NumArgs = 1; 2133 2134 if (isStdInitializerList(Member->getType(), 0)) { 2135 Diag(IdLoc, diag::warn_dangling_std_initializer_list) 2136 << /*at end of ctor*/1 << InitRange; 2137 } 2138 } 2139 2140 // Initialize the member. 2141 InitializedEntity MemberEntity = 2142 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2143 : InitializedEntity::InitializeMember(IndirectMember, 0); 2144 InitializationKind Kind = 2145 InitList ? InitializationKind::CreateDirectList(IdLoc) 2146 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2147 InitRange.getEnd()); 2148 2149 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 2150 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, 2151 MultiExprArg(*this, Args, NumArgs), 2152 0); 2153 if (MemberInit.isInvalid()) 2154 return true; 2155 2156 CheckImplicitConversions(MemberInit.get(), 2157 InitRange.getBegin()); 2158 2159 // C++0x [class.base.init]p7: 2160 // The initialization of each base and member constitutes a 2161 // full-expression. 2162 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2163 if (MemberInit.isInvalid()) 2164 return true; 2165 2166 // If we are in a dependent context, template instantiation will 2167 // perform this type-checking again. Just save the arguments that we 2168 // received. 2169 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2170 // of the information that we have about the member 2171 // initializer. However, deconstructing the ASTs is a dicey process, 2172 // and this approach is far more likely to get the corner cases right. 2173 if (CurContext->isDependentContext()) { 2174 // The existing Init will do fine. 2175 } else { 2176 Init = MemberInit.get(); 2177 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2178 } 2179 } 2180 2181 if (DirectMember) { 2182 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2183 InitRange.getBegin(), Init, 2184 InitRange.getEnd()); 2185 } else { 2186 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2187 InitRange.getBegin(), Init, 2188 InitRange.getEnd()); 2189 } 2190} 2191 2192MemInitResult 2193Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2194 CXXRecordDecl *ClassDecl) { 2195 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2196 if (!LangOpts.CPlusPlus0x) 2197 return Diag(NameLoc, diag::err_delegating_ctor) 2198 << TInfo->getTypeLoc().getLocalSourceRange(); 2199 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2200 2201 bool InitList = true; 2202 Expr **Args = &Init; 2203 unsigned NumArgs = 1; 2204 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2205 InitList = false; 2206 Args = ParenList->getExprs(); 2207 NumArgs = ParenList->getNumExprs(); 2208 } 2209 2210 SourceRange InitRange = Init->getSourceRange(); 2211 // Initialize the object. 2212 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2213 QualType(ClassDecl->getTypeForDecl(), 0)); 2214 InitializationKind Kind = 2215 InitList ? InitializationKind::CreateDirectList(NameLoc) 2216 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2217 InitRange.getEnd()); 2218 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 2219 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2220 MultiExprArg(*this, Args,NumArgs), 2221 0); 2222 if (DelegationInit.isInvalid()) 2223 return true; 2224 2225 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2226 "Delegating constructor with no target?"); 2227 2228 CheckImplicitConversions(DelegationInit.get(), InitRange.getBegin()); 2229 2230 // C++0x [class.base.init]p7: 2231 // The initialization of each base and member constitutes a 2232 // full-expression. 2233 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2234 if (DelegationInit.isInvalid()) 2235 return true; 2236 2237 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2238 DelegationInit.takeAs<Expr>(), 2239 InitRange.getEnd()); 2240} 2241 2242MemInitResult 2243Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2244 Expr *Init, CXXRecordDecl *ClassDecl, 2245 SourceLocation EllipsisLoc) { 2246 SourceLocation BaseLoc 2247 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2248 2249 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2250 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2251 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2252 2253 // C++ [class.base.init]p2: 2254 // [...] Unless the mem-initializer-id names a nonstatic data 2255 // member of the constructor's class or a direct or virtual base 2256 // of that class, the mem-initializer is ill-formed. A 2257 // mem-initializer-list can initialize a base class using any 2258 // name that denotes that base class type. 2259 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2260 2261 SourceRange InitRange = Init->getSourceRange(); 2262 if (EllipsisLoc.isValid()) { 2263 // This is a pack expansion. 2264 if (!BaseType->containsUnexpandedParameterPack()) { 2265 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2266 << SourceRange(BaseLoc, InitRange.getEnd()); 2267 2268 EllipsisLoc = SourceLocation(); 2269 } 2270 } else { 2271 // Check for any unexpanded parameter packs. 2272 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2273 return true; 2274 2275 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2276 return true; 2277 } 2278 2279 // Check for direct and virtual base classes. 2280 const CXXBaseSpecifier *DirectBaseSpec = 0; 2281 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2282 if (!Dependent) { 2283 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2284 BaseType)) 2285 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2286 2287 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2288 VirtualBaseSpec); 2289 2290 // C++ [base.class.init]p2: 2291 // Unless the mem-initializer-id names a nonstatic data member of the 2292 // constructor's class or a direct or virtual base of that class, the 2293 // mem-initializer is ill-formed. 2294 if (!DirectBaseSpec && !VirtualBaseSpec) { 2295 // If the class has any dependent bases, then it's possible that 2296 // one of those types will resolve to the same type as 2297 // BaseType. Therefore, just treat this as a dependent base 2298 // class initialization. FIXME: Should we try to check the 2299 // initialization anyway? It seems odd. 2300 if (ClassDecl->hasAnyDependentBases()) 2301 Dependent = true; 2302 else 2303 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2304 << BaseType << Context.getTypeDeclType(ClassDecl) 2305 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2306 } 2307 } 2308 2309 if (Dependent) { 2310 DiscardCleanupsInEvaluationContext(); 2311 2312 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2313 /*IsVirtual=*/false, 2314 InitRange.getBegin(), Init, 2315 InitRange.getEnd(), EllipsisLoc); 2316 } 2317 2318 // C++ [base.class.init]p2: 2319 // If a mem-initializer-id is ambiguous because it designates both 2320 // a direct non-virtual base class and an inherited virtual base 2321 // class, the mem-initializer is ill-formed. 2322 if (DirectBaseSpec && VirtualBaseSpec) 2323 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2324 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2325 2326 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2327 if (!BaseSpec) 2328 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2329 2330 // Initialize the base. 2331 bool InitList = true; 2332 Expr **Args = &Init; 2333 unsigned NumArgs = 1; 2334 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2335 InitList = false; 2336 Args = ParenList->getExprs(); 2337 NumArgs = ParenList->getNumExprs(); 2338 } 2339 2340 InitializedEntity BaseEntity = 2341 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2342 InitializationKind Kind = 2343 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2344 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2345 InitRange.getEnd()); 2346 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 2347 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, 2348 MultiExprArg(*this, Args, NumArgs), 2349 0); 2350 if (BaseInit.isInvalid()) 2351 return true; 2352 2353 CheckImplicitConversions(BaseInit.get(), InitRange.getBegin()); 2354 2355 // C++0x [class.base.init]p7: 2356 // The initialization of each base and member constitutes a 2357 // full-expression. 2358 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2359 if (BaseInit.isInvalid()) 2360 return true; 2361 2362 // If we are in a dependent context, template instantiation will 2363 // perform this type-checking again. Just save the arguments that we 2364 // received in a ParenListExpr. 2365 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2366 // of the information that we have about the base 2367 // initializer. However, deconstructing the ASTs is a dicey process, 2368 // and this approach is far more likely to get the corner cases right. 2369 if (CurContext->isDependentContext()) 2370 BaseInit = Owned(Init); 2371 2372 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2373 BaseSpec->isVirtual(), 2374 InitRange.getBegin(), 2375 BaseInit.takeAs<Expr>(), 2376 InitRange.getEnd(), EllipsisLoc); 2377} 2378 2379// Create a static_cast\<T&&>(expr). 2380static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2381 QualType ExprType = E->getType(); 2382 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2383 SourceLocation ExprLoc = E->getLocStart(); 2384 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2385 TargetType, ExprLoc); 2386 2387 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2388 SourceRange(ExprLoc, ExprLoc), 2389 E->getSourceRange()).take(); 2390} 2391 2392/// ImplicitInitializerKind - How an implicit base or member initializer should 2393/// initialize its base or member. 2394enum ImplicitInitializerKind { 2395 IIK_Default, 2396 IIK_Copy, 2397 IIK_Move 2398}; 2399 2400static bool 2401BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2402 ImplicitInitializerKind ImplicitInitKind, 2403 CXXBaseSpecifier *BaseSpec, 2404 bool IsInheritedVirtualBase, 2405 CXXCtorInitializer *&CXXBaseInit) { 2406 InitializedEntity InitEntity 2407 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2408 IsInheritedVirtualBase); 2409 2410 ExprResult BaseInit; 2411 2412 switch (ImplicitInitKind) { 2413 case IIK_Default: { 2414 InitializationKind InitKind 2415 = InitializationKind::CreateDefault(Constructor->getLocation()); 2416 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2417 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2418 MultiExprArg(SemaRef, 0, 0)); 2419 break; 2420 } 2421 2422 case IIK_Move: 2423 case IIK_Copy: { 2424 bool Moving = ImplicitInitKind == IIK_Move; 2425 ParmVarDecl *Param = Constructor->getParamDecl(0); 2426 QualType ParamType = Param->getType().getNonReferenceType(); 2427 2428 Expr *CopyCtorArg = 2429 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2430 SourceLocation(), Param, false, 2431 Constructor->getLocation(), ParamType, 2432 VK_LValue, 0); 2433 2434 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2435 2436 // Cast to the base class to avoid ambiguities. 2437 QualType ArgTy = 2438 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2439 ParamType.getQualifiers()); 2440 2441 if (Moving) { 2442 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2443 } 2444 2445 CXXCastPath BasePath; 2446 BasePath.push_back(BaseSpec); 2447 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2448 CK_UncheckedDerivedToBase, 2449 Moving ? VK_XValue : VK_LValue, 2450 &BasePath).take(); 2451 2452 InitializationKind InitKind 2453 = InitializationKind::CreateDirect(Constructor->getLocation(), 2454 SourceLocation(), SourceLocation()); 2455 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2456 &CopyCtorArg, 1); 2457 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2458 MultiExprArg(&CopyCtorArg, 1)); 2459 break; 2460 } 2461 } 2462 2463 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2464 if (BaseInit.isInvalid()) 2465 return true; 2466 2467 CXXBaseInit = 2468 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2469 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2470 SourceLocation()), 2471 BaseSpec->isVirtual(), 2472 SourceLocation(), 2473 BaseInit.takeAs<Expr>(), 2474 SourceLocation(), 2475 SourceLocation()); 2476 2477 return false; 2478} 2479 2480static bool RefersToRValueRef(Expr *MemRef) { 2481 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2482 return Referenced->getType()->isRValueReferenceType(); 2483} 2484 2485static bool 2486BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2487 ImplicitInitializerKind ImplicitInitKind, 2488 FieldDecl *Field, IndirectFieldDecl *Indirect, 2489 CXXCtorInitializer *&CXXMemberInit) { 2490 if (Field->isInvalidDecl()) 2491 return true; 2492 2493 SourceLocation Loc = Constructor->getLocation(); 2494 2495 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2496 bool Moving = ImplicitInitKind == IIK_Move; 2497 ParmVarDecl *Param = Constructor->getParamDecl(0); 2498 QualType ParamType = Param->getType().getNonReferenceType(); 2499 2500 // Suppress copying zero-width bitfields. 2501 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2502 return false; 2503 2504 Expr *MemberExprBase = 2505 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2506 SourceLocation(), Param, false, 2507 Loc, ParamType, VK_LValue, 0); 2508 2509 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2510 2511 if (Moving) { 2512 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2513 } 2514 2515 // Build a reference to this field within the parameter. 2516 CXXScopeSpec SS; 2517 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2518 Sema::LookupMemberName); 2519 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2520 : cast<ValueDecl>(Field), AS_public); 2521 MemberLookup.resolveKind(); 2522 ExprResult CtorArg 2523 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2524 ParamType, Loc, 2525 /*IsArrow=*/false, 2526 SS, 2527 /*TemplateKWLoc=*/SourceLocation(), 2528 /*FirstQualifierInScope=*/0, 2529 MemberLookup, 2530 /*TemplateArgs=*/0); 2531 if (CtorArg.isInvalid()) 2532 return true; 2533 2534 // C++11 [class.copy]p15: 2535 // - if a member m has rvalue reference type T&&, it is direct-initialized 2536 // with static_cast<T&&>(x.m); 2537 if (RefersToRValueRef(CtorArg.get())) { 2538 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2539 } 2540 2541 // When the field we are copying is an array, create index variables for 2542 // each dimension of the array. We use these index variables to subscript 2543 // the source array, and other clients (e.g., CodeGen) will perform the 2544 // necessary iteration with these index variables. 2545 SmallVector<VarDecl *, 4> IndexVariables; 2546 QualType BaseType = Field->getType(); 2547 QualType SizeType = SemaRef.Context.getSizeType(); 2548 bool InitializingArray = false; 2549 while (const ConstantArrayType *Array 2550 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2551 InitializingArray = true; 2552 // Create the iteration variable for this array index. 2553 IdentifierInfo *IterationVarName = 0; 2554 { 2555 SmallString<8> Str; 2556 llvm::raw_svector_ostream OS(Str); 2557 OS << "__i" << IndexVariables.size(); 2558 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2559 } 2560 VarDecl *IterationVar 2561 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2562 IterationVarName, SizeType, 2563 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2564 SC_None, SC_None); 2565 IndexVariables.push_back(IterationVar); 2566 2567 // Create a reference to the iteration variable. 2568 ExprResult IterationVarRef 2569 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2570 assert(!IterationVarRef.isInvalid() && 2571 "Reference to invented variable cannot fail!"); 2572 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2573 assert(!IterationVarRef.isInvalid() && 2574 "Conversion of invented variable cannot fail!"); 2575 2576 // Subscript the array with this iteration variable. 2577 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2578 IterationVarRef.take(), 2579 Loc); 2580 if (CtorArg.isInvalid()) 2581 return true; 2582 2583 BaseType = Array->getElementType(); 2584 } 2585 2586 // The array subscript expression is an lvalue, which is wrong for moving. 2587 if (Moving && InitializingArray) 2588 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2589 2590 // Construct the entity that we will be initializing. For an array, this 2591 // will be first element in the array, which may require several levels 2592 // of array-subscript entities. 2593 SmallVector<InitializedEntity, 4> Entities; 2594 Entities.reserve(1 + IndexVariables.size()); 2595 if (Indirect) 2596 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2597 else 2598 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2599 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2600 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2601 0, 2602 Entities.back())); 2603 2604 // Direct-initialize to use the copy constructor. 2605 InitializationKind InitKind = 2606 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2607 2608 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2609 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2610 &CtorArgE, 1); 2611 2612 ExprResult MemberInit 2613 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2614 MultiExprArg(&CtorArgE, 1)); 2615 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2616 if (MemberInit.isInvalid()) 2617 return true; 2618 2619 if (Indirect) { 2620 assert(IndexVariables.size() == 0 && 2621 "Indirect field improperly initialized"); 2622 CXXMemberInit 2623 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2624 Loc, Loc, 2625 MemberInit.takeAs<Expr>(), 2626 Loc); 2627 } else 2628 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2629 Loc, MemberInit.takeAs<Expr>(), 2630 Loc, 2631 IndexVariables.data(), 2632 IndexVariables.size()); 2633 return false; 2634 } 2635 2636 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2637 2638 QualType FieldBaseElementType = 2639 SemaRef.Context.getBaseElementType(Field->getType()); 2640 2641 if (FieldBaseElementType->isRecordType()) { 2642 InitializedEntity InitEntity 2643 = Indirect? InitializedEntity::InitializeMember(Indirect) 2644 : InitializedEntity::InitializeMember(Field); 2645 InitializationKind InitKind = 2646 InitializationKind::CreateDefault(Loc); 2647 2648 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2649 ExprResult MemberInit = 2650 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2651 2652 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2653 if (MemberInit.isInvalid()) 2654 return true; 2655 2656 if (Indirect) 2657 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2658 Indirect, Loc, 2659 Loc, 2660 MemberInit.get(), 2661 Loc); 2662 else 2663 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2664 Field, Loc, Loc, 2665 MemberInit.get(), 2666 Loc); 2667 return false; 2668 } 2669 2670 if (!Field->getParent()->isUnion()) { 2671 if (FieldBaseElementType->isReferenceType()) { 2672 SemaRef.Diag(Constructor->getLocation(), 2673 diag::err_uninitialized_member_in_ctor) 2674 << (int)Constructor->isImplicit() 2675 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2676 << 0 << Field->getDeclName(); 2677 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2678 return true; 2679 } 2680 2681 if (FieldBaseElementType.isConstQualified()) { 2682 SemaRef.Diag(Constructor->getLocation(), 2683 diag::err_uninitialized_member_in_ctor) 2684 << (int)Constructor->isImplicit() 2685 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2686 << 1 << Field->getDeclName(); 2687 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2688 return true; 2689 } 2690 } 2691 2692 if (SemaRef.getLangOpts().ObjCAutoRefCount && 2693 FieldBaseElementType->isObjCRetainableType() && 2694 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2695 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2696 // Instant objects: 2697 // Default-initialize Objective-C pointers to NULL. 2698 CXXMemberInit 2699 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2700 Loc, Loc, 2701 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2702 Loc); 2703 return false; 2704 } 2705 2706 // Nothing to initialize. 2707 CXXMemberInit = 0; 2708 return false; 2709} 2710 2711namespace { 2712struct BaseAndFieldInfo { 2713 Sema &S; 2714 CXXConstructorDecl *Ctor; 2715 bool AnyErrorsInInits; 2716 ImplicitInitializerKind IIK; 2717 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2718 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2719 2720 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2721 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2722 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2723 if (Generated && Ctor->isCopyConstructor()) 2724 IIK = IIK_Copy; 2725 else if (Generated && Ctor->isMoveConstructor()) 2726 IIK = IIK_Move; 2727 else 2728 IIK = IIK_Default; 2729 } 2730 2731 bool isImplicitCopyOrMove() const { 2732 switch (IIK) { 2733 case IIK_Copy: 2734 case IIK_Move: 2735 return true; 2736 2737 case IIK_Default: 2738 return false; 2739 } 2740 2741 llvm_unreachable("Invalid ImplicitInitializerKind!"); 2742 } 2743}; 2744} 2745 2746/// \brief Determine whether the given indirect field declaration is somewhere 2747/// within an anonymous union. 2748static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2749 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2750 CEnd = F->chain_end(); 2751 C != CEnd; ++C) 2752 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2753 if (Record->isUnion()) 2754 return true; 2755 2756 return false; 2757} 2758 2759/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2760/// array type. 2761static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2762 if (T->isIncompleteArrayType()) 2763 return true; 2764 2765 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2766 if (!ArrayT->getSize()) 2767 return true; 2768 2769 T = ArrayT->getElementType(); 2770 } 2771 2772 return false; 2773} 2774 2775static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2776 FieldDecl *Field, 2777 IndirectFieldDecl *Indirect = 0) { 2778 2779 // Overwhelmingly common case: we have a direct initializer for this field. 2780 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2781 Info.AllToInit.push_back(Init); 2782 return false; 2783 } 2784 2785 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2786 // has a brace-or-equal-initializer, the entity is initialized as specified 2787 // in [dcl.init]. 2788 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 2789 CXXCtorInitializer *Init; 2790 if (Indirect) 2791 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2792 SourceLocation(), 2793 SourceLocation(), 0, 2794 SourceLocation()); 2795 else 2796 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2797 SourceLocation(), 2798 SourceLocation(), 0, 2799 SourceLocation()); 2800 Info.AllToInit.push_back(Init); 2801 return false; 2802 } 2803 2804 // Don't build an implicit initializer for union members if none was 2805 // explicitly specified. 2806 if (Field->getParent()->isUnion() || 2807 (Indirect && isWithinAnonymousUnion(Indirect))) 2808 return false; 2809 2810 // Don't initialize incomplete or zero-length arrays. 2811 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 2812 return false; 2813 2814 // Don't try to build an implicit initializer if there were semantic 2815 // errors in any of the initializers (and therefore we might be 2816 // missing some that the user actually wrote). 2817 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2818 return false; 2819 2820 CXXCtorInitializer *Init = 0; 2821 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2822 Indirect, Init)) 2823 return true; 2824 2825 if (Init) 2826 Info.AllToInit.push_back(Init); 2827 2828 return false; 2829} 2830 2831bool 2832Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2833 CXXCtorInitializer *Initializer) { 2834 assert(Initializer->isDelegatingInitializer()); 2835 Constructor->setNumCtorInitializers(1); 2836 CXXCtorInitializer **initializer = 2837 new (Context) CXXCtorInitializer*[1]; 2838 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2839 Constructor->setCtorInitializers(initializer); 2840 2841 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2842 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 2843 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2844 } 2845 2846 DelegatingCtorDecls.push_back(Constructor); 2847 2848 return false; 2849} 2850 2851bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2852 CXXCtorInitializer **Initializers, 2853 unsigned NumInitializers, 2854 bool AnyErrors) { 2855 if (Constructor->isDependentContext()) { 2856 // Just store the initializers as written, they will be checked during 2857 // instantiation. 2858 if (NumInitializers > 0) { 2859 Constructor->setNumCtorInitializers(NumInitializers); 2860 CXXCtorInitializer **baseOrMemberInitializers = 2861 new (Context) CXXCtorInitializer*[NumInitializers]; 2862 memcpy(baseOrMemberInitializers, Initializers, 2863 NumInitializers * sizeof(CXXCtorInitializer*)); 2864 Constructor->setCtorInitializers(baseOrMemberInitializers); 2865 } 2866 2867 return false; 2868 } 2869 2870 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2871 2872 // We need to build the initializer AST according to order of construction 2873 // and not what user specified in the Initializers list. 2874 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2875 if (!ClassDecl) 2876 return true; 2877 2878 bool HadError = false; 2879 2880 for (unsigned i = 0; i < NumInitializers; i++) { 2881 CXXCtorInitializer *Member = Initializers[i]; 2882 2883 if (Member->isBaseInitializer()) 2884 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2885 else 2886 Info.AllBaseFields[Member->getAnyMember()] = Member; 2887 } 2888 2889 // Keep track of the direct virtual bases. 2890 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2891 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2892 E = ClassDecl->bases_end(); I != E; ++I) { 2893 if (I->isVirtual()) 2894 DirectVBases.insert(I); 2895 } 2896 2897 // Push virtual bases before others. 2898 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2899 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2900 2901 if (CXXCtorInitializer *Value 2902 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2903 Info.AllToInit.push_back(Value); 2904 } else if (!AnyErrors) { 2905 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2906 CXXCtorInitializer *CXXBaseInit; 2907 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2908 VBase, IsInheritedVirtualBase, 2909 CXXBaseInit)) { 2910 HadError = true; 2911 continue; 2912 } 2913 2914 Info.AllToInit.push_back(CXXBaseInit); 2915 } 2916 } 2917 2918 // Non-virtual bases. 2919 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2920 E = ClassDecl->bases_end(); Base != E; ++Base) { 2921 // Virtuals are in the virtual base list and already constructed. 2922 if (Base->isVirtual()) 2923 continue; 2924 2925 if (CXXCtorInitializer *Value 2926 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2927 Info.AllToInit.push_back(Value); 2928 } else if (!AnyErrors) { 2929 CXXCtorInitializer *CXXBaseInit; 2930 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2931 Base, /*IsInheritedVirtualBase=*/false, 2932 CXXBaseInit)) { 2933 HadError = true; 2934 continue; 2935 } 2936 2937 Info.AllToInit.push_back(CXXBaseInit); 2938 } 2939 } 2940 2941 // Fields. 2942 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 2943 MemEnd = ClassDecl->decls_end(); 2944 Mem != MemEnd; ++Mem) { 2945 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 2946 // C++ [class.bit]p2: 2947 // A declaration for a bit-field that omits the identifier declares an 2948 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 2949 // initialized. 2950 if (F->isUnnamedBitfield()) 2951 continue; 2952 2953 // If we're not generating the implicit copy/move constructor, then we'll 2954 // handle anonymous struct/union fields based on their individual 2955 // indirect fields. 2956 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 2957 continue; 2958 2959 if (CollectFieldInitializer(*this, Info, F)) 2960 HadError = true; 2961 continue; 2962 } 2963 2964 // Beyond this point, we only consider default initialization. 2965 if (Info.IIK != IIK_Default) 2966 continue; 2967 2968 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 2969 if (F->getType()->isIncompleteArrayType()) { 2970 assert(ClassDecl->hasFlexibleArrayMember() && 2971 "Incomplete array type is not valid"); 2972 continue; 2973 } 2974 2975 // Initialize each field of an anonymous struct individually. 2976 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 2977 HadError = true; 2978 2979 continue; 2980 } 2981 } 2982 2983 NumInitializers = Info.AllToInit.size(); 2984 if (NumInitializers > 0) { 2985 Constructor->setNumCtorInitializers(NumInitializers); 2986 CXXCtorInitializer **baseOrMemberInitializers = 2987 new (Context) CXXCtorInitializer*[NumInitializers]; 2988 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2989 NumInitializers * sizeof(CXXCtorInitializer*)); 2990 Constructor->setCtorInitializers(baseOrMemberInitializers); 2991 2992 // Constructors implicitly reference the base and member 2993 // destructors. 2994 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2995 Constructor->getParent()); 2996 } 2997 2998 return HadError; 2999} 3000 3001static void *GetKeyForTopLevelField(FieldDecl *Field) { 3002 // For anonymous unions, use the class declaration as the key. 3003 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 3004 if (RT->getDecl()->isAnonymousStructOrUnion()) 3005 return static_cast<void *>(RT->getDecl()); 3006 } 3007 return static_cast<void *>(Field); 3008} 3009 3010static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 3011 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 3012} 3013 3014static void *GetKeyForMember(ASTContext &Context, 3015 CXXCtorInitializer *Member) { 3016 if (!Member->isAnyMemberInitializer()) 3017 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3018 3019 // For fields injected into the class via declaration of an anonymous union, 3020 // use its anonymous union class declaration as the unique key. 3021 FieldDecl *Field = Member->getAnyMember(); 3022 3023 // If the field is a member of an anonymous struct or union, our key 3024 // is the anonymous record decl that's a direct child of the class. 3025 RecordDecl *RD = Field->getParent(); 3026 if (RD->isAnonymousStructOrUnion()) { 3027 while (true) { 3028 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 3029 if (Parent->isAnonymousStructOrUnion()) 3030 RD = Parent; 3031 else 3032 break; 3033 } 3034 3035 return static_cast<void *>(RD); 3036 } 3037 3038 return static_cast<void *>(Field); 3039} 3040 3041static void 3042DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 3043 const CXXConstructorDecl *Constructor, 3044 CXXCtorInitializer **Inits, 3045 unsigned NumInits) { 3046 if (Constructor->getDeclContext()->isDependentContext()) 3047 return; 3048 3049 // Don't check initializers order unless the warning is enabled at the 3050 // location of at least one initializer. 3051 bool ShouldCheckOrder = false; 3052 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3053 CXXCtorInitializer *Init = Inits[InitIndex]; 3054 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3055 Init->getSourceLocation()) 3056 != DiagnosticsEngine::Ignored) { 3057 ShouldCheckOrder = true; 3058 break; 3059 } 3060 } 3061 if (!ShouldCheckOrder) 3062 return; 3063 3064 // Build the list of bases and members in the order that they'll 3065 // actually be initialized. The explicit initializers should be in 3066 // this same order but may be missing things. 3067 SmallVector<const void*, 32> IdealInitKeys; 3068 3069 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3070 3071 // 1. Virtual bases. 3072 for (CXXRecordDecl::base_class_const_iterator VBase = 3073 ClassDecl->vbases_begin(), 3074 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3075 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3076 3077 // 2. Non-virtual bases. 3078 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3079 E = ClassDecl->bases_end(); Base != E; ++Base) { 3080 if (Base->isVirtual()) 3081 continue; 3082 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3083 } 3084 3085 // 3. Direct fields. 3086 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3087 E = ClassDecl->field_end(); Field != E; ++Field) { 3088 if (Field->isUnnamedBitfield()) 3089 continue; 3090 3091 IdealInitKeys.push_back(GetKeyForTopLevelField(&*Field)); 3092 } 3093 3094 unsigned NumIdealInits = IdealInitKeys.size(); 3095 unsigned IdealIndex = 0; 3096 3097 CXXCtorInitializer *PrevInit = 0; 3098 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3099 CXXCtorInitializer *Init = Inits[InitIndex]; 3100 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3101 3102 // Scan forward to try to find this initializer in the idealized 3103 // initializers list. 3104 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3105 if (InitKey == IdealInitKeys[IdealIndex]) 3106 break; 3107 3108 // If we didn't find this initializer, it must be because we 3109 // scanned past it on a previous iteration. That can only 3110 // happen if we're out of order; emit a warning. 3111 if (IdealIndex == NumIdealInits && PrevInit) { 3112 Sema::SemaDiagnosticBuilder D = 3113 SemaRef.Diag(PrevInit->getSourceLocation(), 3114 diag::warn_initializer_out_of_order); 3115 3116 if (PrevInit->isAnyMemberInitializer()) 3117 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3118 else 3119 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3120 3121 if (Init->isAnyMemberInitializer()) 3122 D << 0 << Init->getAnyMember()->getDeclName(); 3123 else 3124 D << 1 << Init->getTypeSourceInfo()->getType(); 3125 3126 // Move back to the initializer's location in the ideal list. 3127 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3128 if (InitKey == IdealInitKeys[IdealIndex]) 3129 break; 3130 3131 assert(IdealIndex != NumIdealInits && 3132 "initializer not found in initializer list"); 3133 } 3134 3135 PrevInit = Init; 3136 } 3137} 3138 3139namespace { 3140bool CheckRedundantInit(Sema &S, 3141 CXXCtorInitializer *Init, 3142 CXXCtorInitializer *&PrevInit) { 3143 if (!PrevInit) { 3144 PrevInit = Init; 3145 return false; 3146 } 3147 3148 if (FieldDecl *Field = Init->getMember()) 3149 S.Diag(Init->getSourceLocation(), 3150 diag::err_multiple_mem_initialization) 3151 << Field->getDeclName() 3152 << Init->getSourceRange(); 3153 else { 3154 const Type *BaseClass = Init->getBaseClass(); 3155 assert(BaseClass && "neither field nor base"); 3156 S.Diag(Init->getSourceLocation(), 3157 diag::err_multiple_base_initialization) 3158 << QualType(BaseClass, 0) 3159 << Init->getSourceRange(); 3160 } 3161 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3162 << 0 << PrevInit->getSourceRange(); 3163 3164 return true; 3165} 3166 3167typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3168typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3169 3170bool CheckRedundantUnionInit(Sema &S, 3171 CXXCtorInitializer *Init, 3172 RedundantUnionMap &Unions) { 3173 FieldDecl *Field = Init->getAnyMember(); 3174 RecordDecl *Parent = Field->getParent(); 3175 NamedDecl *Child = Field; 3176 3177 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3178 if (Parent->isUnion()) { 3179 UnionEntry &En = Unions[Parent]; 3180 if (En.first && En.first != Child) { 3181 S.Diag(Init->getSourceLocation(), 3182 diag::err_multiple_mem_union_initialization) 3183 << Field->getDeclName() 3184 << Init->getSourceRange(); 3185 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3186 << 0 << En.second->getSourceRange(); 3187 return true; 3188 } 3189 if (!En.first) { 3190 En.first = Child; 3191 En.second = Init; 3192 } 3193 if (!Parent->isAnonymousStructOrUnion()) 3194 return false; 3195 } 3196 3197 Child = Parent; 3198 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3199 } 3200 3201 return false; 3202} 3203} 3204 3205/// ActOnMemInitializers - Handle the member initializers for a constructor. 3206void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3207 SourceLocation ColonLoc, 3208 CXXCtorInitializer **meminits, 3209 unsigned NumMemInits, 3210 bool AnyErrors) { 3211 if (!ConstructorDecl) 3212 return; 3213 3214 AdjustDeclIfTemplate(ConstructorDecl); 3215 3216 CXXConstructorDecl *Constructor 3217 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3218 3219 if (!Constructor) { 3220 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3221 return; 3222 } 3223 3224 CXXCtorInitializer **MemInits = 3225 reinterpret_cast<CXXCtorInitializer **>(meminits); 3226 3227 // Mapping for the duplicate initializers check. 3228 // For member initializers, this is keyed with a FieldDecl*. 3229 // For base initializers, this is keyed with a Type*. 3230 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3231 3232 // Mapping for the inconsistent anonymous-union initializers check. 3233 RedundantUnionMap MemberUnions; 3234 3235 bool HadError = false; 3236 for (unsigned i = 0; i < NumMemInits; i++) { 3237 CXXCtorInitializer *Init = MemInits[i]; 3238 3239 // Set the source order index. 3240 Init->setSourceOrder(i); 3241 3242 if (Init->isAnyMemberInitializer()) { 3243 FieldDecl *Field = Init->getAnyMember(); 3244 if (CheckRedundantInit(*this, Init, Members[Field]) || 3245 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3246 HadError = true; 3247 } else if (Init->isBaseInitializer()) { 3248 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3249 if (CheckRedundantInit(*this, Init, Members[Key])) 3250 HadError = true; 3251 } else { 3252 assert(Init->isDelegatingInitializer()); 3253 // This must be the only initializer 3254 if (i != 0 || NumMemInits > 1) { 3255 Diag(MemInits[0]->getSourceLocation(), 3256 diag::err_delegating_initializer_alone) 3257 << MemInits[0]->getSourceRange(); 3258 HadError = true; 3259 // We will treat this as being the only initializer. 3260 } 3261 SetDelegatingInitializer(Constructor, MemInits[i]); 3262 // Return immediately as the initializer is set. 3263 return; 3264 } 3265 } 3266 3267 if (HadError) 3268 return; 3269 3270 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3271 3272 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3273} 3274 3275void 3276Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3277 CXXRecordDecl *ClassDecl) { 3278 // Ignore dependent contexts. Also ignore unions, since their members never 3279 // have destructors implicitly called. 3280 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3281 return; 3282 3283 // FIXME: all the access-control diagnostics are positioned on the 3284 // field/base declaration. That's probably good; that said, the 3285 // user might reasonably want to know why the destructor is being 3286 // emitted, and we currently don't say. 3287 3288 // Non-static data members. 3289 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3290 E = ClassDecl->field_end(); I != E; ++I) { 3291 FieldDecl *Field = &*I; 3292 if (Field->isInvalidDecl()) 3293 continue; 3294 3295 // Don't destroy incomplete or zero-length arrays. 3296 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3297 continue; 3298 3299 QualType FieldType = Context.getBaseElementType(Field->getType()); 3300 3301 const RecordType* RT = FieldType->getAs<RecordType>(); 3302 if (!RT) 3303 continue; 3304 3305 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3306 if (FieldClassDecl->isInvalidDecl()) 3307 continue; 3308 if (FieldClassDecl->hasIrrelevantDestructor()) 3309 continue; 3310 // The destructor for an implicit anonymous union member is never invoked. 3311 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) 3312 continue; 3313 3314 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3315 assert(Dtor && "No dtor found for FieldClassDecl!"); 3316 CheckDestructorAccess(Field->getLocation(), Dtor, 3317 PDiag(diag::err_access_dtor_field) 3318 << Field->getDeclName() 3319 << FieldType); 3320 3321 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3322 DiagnoseUseOfDecl(Dtor, Location); 3323 } 3324 3325 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3326 3327 // Bases. 3328 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3329 E = ClassDecl->bases_end(); Base != E; ++Base) { 3330 // Bases are always records in a well-formed non-dependent class. 3331 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3332 3333 // Remember direct virtual bases. 3334 if (Base->isVirtual()) 3335 DirectVirtualBases.insert(RT); 3336 3337 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3338 // If our base class is invalid, we probably can't get its dtor anyway. 3339 if (BaseClassDecl->isInvalidDecl()) 3340 continue; 3341 if (BaseClassDecl->hasIrrelevantDestructor()) 3342 continue; 3343 3344 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3345 assert(Dtor && "No dtor found for BaseClassDecl!"); 3346 3347 // FIXME: caret should be on the start of the class name 3348 CheckDestructorAccess(Base->getLocStart(), Dtor, 3349 PDiag(diag::err_access_dtor_base) 3350 << Base->getType() 3351 << Base->getSourceRange(), 3352 Context.getTypeDeclType(ClassDecl)); 3353 3354 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3355 DiagnoseUseOfDecl(Dtor, Location); 3356 } 3357 3358 // Virtual bases. 3359 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3360 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3361 3362 // Bases are always records in a well-formed non-dependent class. 3363 const RecordType *RT = VBase->getType()->castAs<RecordType>(); 3364 3365 // Ignore direct virtual bases. 3366 if (DirectVirtualBases.count(RT)) 3367 continue; 3368 3369 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3370 // If our base class is invalid, we probably can't get its dtor anyway. 3371 if (BaseClassDecl->isInvalidDecl()) 3372 continue; 3373 if (BaseClassDecl->hasIrrelevantDestructor()) 3374 continue; 3375 3376 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3377 assert(Dtor && "No dtor found for BaseClassDecl!"); 3378 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3379 PDiag(diag::err_access_dtor_vbase) 3380 << VBase->getType(), 3381 Context.getTypeDeclType(ClassDecl)); 3382 3383 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3384 DiagnoseUseOfDecl(Dtor, Location); 3385 } 3386} 3387 3388void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3389 if (!CDtorDecl) 3390 return; 3391 3392 if (CXXConstructorDecl *Constructor 3393 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3394 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3395} 3396 3397bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3398 unsigned DiagID, AbstractDiagSelID SelID) { 3399 class NonAbstractTypeDiagnoser : public TypeDiagnoser { 3400 unsigned DiagID; 3401 AbstractDiagSelID SelID; 3402 3403 public: 3404 NonAbstractTypeDiagnoser(unsigned DiagID, AbstractDiagSelID SelID) 3405 : TypeDiagnoser(DiagID == 0), DiagID(DiagID), SelID(SelID) { } 3406 3407 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 3408 if (SelID == -1) 3409 S.Diag(Loc, DiagID) << T; 3410 else 3411 S.Diag(Loc, DiagID) << SelID << T; 3412 } 3413 } Diagnoser(DiagID, SelID); 3414 3415 return RequireNonAbstractType(Loc, T, Diagnoser); 3416} 3417 3418bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3419 TypeDiagnoser &Diagnoser) { 3420 if (!getLangOpts().CPlusPlus) 3421 return false; 3422 3423 if (const ArrayType *AT = Context.getAsArrayType(T)) 3424 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3425 3426 if (const PointerType *PT = T->getAs<PointerType>()) { 3427 // Find the innermost pointer type. 3428 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3429 PT = T; 3430 3431 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3432 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3433 } 3434 3435 const RecordType *RT = T->getAs<RecordType>(); 3436 if (!RT) 3437 return false; 3438 3439 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3440 3441 // We can't answer whether something is abstract until it has a 3442 // definition. If it's currently being defined, we'll walk back 3443 // over all the declarations when we have a full definition. 3444 const CXXRecordDecl *Def = RD->getDefinition(); 3445 if (!Def || Def->isBeingDefined()) 3446 return false; 3447 3448 if (!RD->isAbstract()) 3449 return false; 3450 3451 Diagnoser.diagnose(*this, Loc, T); 3452 DiagnoseAbstractType(RD); 3453 3454 return true; 3455} 3456 3457void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3458 // Check if we've already emitted the list of pure virtual functions 3459 // for this class. 3460 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3461 return; 3462 3463 CXXFinalOverriderMap FinalOverriders; 3464 RD->getFinalOverriders(FinalOverriders); 3465 3466 // Keep a set of seen pure methods so we won't diagnose the same method 3467 // more than once. 3468 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3469 3470 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3471 MEnd = FinalOverriders.end(); 3472 M != MEnd; 3473 ++M) { 3474 for (OverridingMethods::iterator SO = M->second.begin(), 3475 SOEnd = M->second.end(); 3476 SO != SOEnd; ++SO) { 3477 // C++ [class.abstract]p4: 3478 // A class is abstract if it contains or inherits at least one 3479 // pure virtual function for which the final overrider is pure 3480 // virtual. 3481 3482 // 3483 if (SO->second.size() != 1) 3484 continue; 3485 3486 if (!SO->second.front().Method->isPure()) 3487 continue; 3488 3489 if (!SeenPureMethods.insert(SO->second.front().Method)) 3490 continue; 3491 3492 Diag(SO->second.front().Method->getLocation(), 3493 diag::note_pure_virtual_function) 3494 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3495 } 3496 } 3497 3498 if (!PureVirtualClassDiagSet) 3499 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3500 PureVirtualClassDiagSet->insert(RD); 3501} 3502 3503namespace { 3504struct AbstractUsageInfo { 3505 Sema &S; 3506 CXXRecordDecl *Record; 3507 CanQualType AbstractType; 3508 bool Invalid; 3509 3510 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3511 : S(S), Record(Record), 3512 AbstractType(S.Context.getCanonicalType( 3513 S.Context.getTypeDeclType(Record))), 3514 Invalid(false) {} 3515 3516 void DiagnoseAbstractType() { 3517 if (Invalid) return; 3518 S.DiagnoseAbstractType(Record); 3519 Invalid = true; 3520 } 3521 3522 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3523}; 3524 3525struct CheckAbstractUsage { 3526 AbstractUsageInfo &Info; 3527 const NamedDecl *Ctx; 3528 3529 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3530 : Info(Info), Ctx(Ctx) {} 3531 3532 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3533 switch (TL.getTypeLocClass()) { 3534#define ABSTRACT_TYPELOC(CLASS, PARENT) 3535#define TYPELOC(CLASS, PARENT) \ 3536 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3537#include "clang/AST/TypeLocNodes.def" 3538 } 3539 } 3540 3541 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3542 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3543 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3544 if (!TL.getArg(I)) 3545 continue; 3546 3547 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3548 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3549 } 3550 } 3551 3552 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3553 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3554 } 3555 3556 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3557 // Visit the type parameters from a permissive context. 3558 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3559 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3560 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3561 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3562 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3563 // TODO: other template argument types? 3564 } 3565 } 3566 3567 // Visit pointee types from a permissive context. 3568#define CheckPolymorphic(Type) \ 3569 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3570 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3571 } 3572 CheckPolymorphic(PointerTypeLoc) 3573 CheckPolymorphic(ReferenceTypeLoc) 3574 CheckPolymorphic(MemberPointerTypeLoc) 3575 CheckPolymorphic(BlockPointerTypeLoc) 3576 CheckPolymorphic(AtomicTypeLoc) 3577 3578 /// Handle all the types we haven't given a more specific 3579 /// implementation for above. 3580 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3581 // Every other kind of type that we haven't called out already 3582 // that has an inner type is either (1) sugar or (2) contains that 3583 // inner type in some way as a subobject. 3584 if (TypeLoc Next = TL.getNextTypeLoc()) 3585 return Visit(Next, Sel); 3586 3587 // If there's no inner type and we're in a permissive context, 3588 // don't diagnose. 3589 if (Sel == Sema::AbstractNone) return; 3590 3591 // Check whether the type matches the abstract type. 3592 QualType T = TL.getType(); 3593 if (T->isArrayType()) { 3594 Sel = Sema::AbstractArrayType; 3595 T = Info.S.Context.getBaseElementType(T); 3596 } 3597 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3598 if (CT != Info.AbstractType) return; 3599 3600 // It matched; do some magic. 3601 if (Sel == Sema::AbstractArrayType) { 3602 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3603 << T << TL.getSourceRange(); 3604 } else { 3605 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3606 << Sel << T << TL.getSourceRange(); 3607 } 3608 Info.DiagnoseAbstractType(); 3609 } 3610}; 3611 3612void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3613 Sema::AbstractDiagSelID Sel) { 3614 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3615} 3616 3617} 3618 3619/// Check for invalid uses of an abstract type in a method declaration. 3620static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3621 CXXMethodDecl *MD) { 3622 // No need to do the check on definitions, which require that 3623 // the return/param types be complete. 3624 if (MD->doesThisDeclarationHaveABody()) 3625 return; 3626 3627 // For safety's sake, just ignore it if we don't have type source 3628 // information. This should never happen for non-implicit methods, 3629 // but... 3630 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3631 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3632} 3633 3634/// Check for invalid uses of an abstract type within a class definition. 3635static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3636 CXXRecordDecl *RD) { 3637 for (CXXRecordDecl::decl_iterator 3638 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3639 Decl *D = *I; 3640 if (D->isImplicit()) continue; 3641 3642 // Methods and method templates. 3643 if (isa<CXXMethodDecl>(D)) { 3644 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3645 } else if (isa<FunctionTemplateDecl>(D)) { 3646 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3647 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3648 3649 // Fields and static variables. 3650 } else if (isa<FieldDecl>(D)) { 3651 FieldDecl *FD = cast<FieldDecl>(D); 3652 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3653 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3654 } else if (isa<VarDecl>(D)) { 3655 VarDecl *VD = cast<VarDecl>(D); 3656 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3657 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3658 3659 // Nested classes and class templates. 3660 } else if (isa<CXXRecordDecl>(D)) { 3661 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3662 } else if (isa<ClassTemplateDecl>(D)) { 3663 CheckAbstractClassUsage(Info, 3664 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3665 } 3666 } 3667} 3668 3669/// \brief Perform semantic checks on a class definition that has been 3670/// completing, introducing implicitly-declared members, checking for 3671/// abstract types, etc. 3672void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3673 if (!Record) 3674 return; 3675 3676 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3677 AbstractUsageInfo Info(*this, Record); 3678 CheckAbstractClassUsage(Info, Record); 3679 } 3680 3681 // If this is not an aggregate type and has no user-declared constructor, 3682 // complain about any non-static data members of reference or const scalar 3683 // type, since they will never get initializers. 3684 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3685 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 3686 !Record->isLambda()) { 3687 bool Complained = false; 3688 for (RecordDecl::field_iterator F = Record->field_begin(), 3689 FEnd = Record->field_end(); 3690 F != FEnd; ++F) { 3691 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3692 continue; 3693 3694 if (F->getType()->isReferenceType() || 3695 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3696 if (!Complained) { 3697 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3698 << Record->getTagKind() << Record; 3699 Complained = true; 3700 } 3701 3702 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3703 << F->getType()->isReferenceType() 3704 << F->getDeclName(); 3705 } 3706 } 3707 } 3708 3709 if (Record->isDynamicClass() && !Record->isDependentType()) 3710 DynamicClasses.push_back(Record); 3711 3712 if (Record->getIdentifier()) { 3713 // C++ [class.mem]p13: 3714 // If T is the name of a class, then each of the following shall have a 3715 // name different from T: 3716 // - every member of every anonymous union that is a member of class T. 3717 // 3718 // C++ [class.mem]p14: 3719 // In addition, if class T has a user-declared constructor (12.1), every 3720 // non-static data member of class T shall have a name different from T. 3721 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3722 R.first != R.second; ++R.first) { 3723 NamedDecl *D = *R.first; 3724 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3725 isa<IndirectFieldDecl>(D)) { 3726 Diag(D->getLocation(), diag::err_member_name_of_class) 3727 << D->getDeclName(); 3728 break; 3729 } 3730 } 3731 } 3732 3733 // Warn if the class has virtual methods but non-virtual public destructor. 3734 if (Record->isPolymorphic() && !Record->isDependentType()) { 3735 CXXDestructorDecl *dtor = Record->getDestructor(); 3736 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3737 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3738 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3739 } 3740 3741 // See if a method overloads virtual methods in a base 3742 /// class without overriding any. 3743 if (!Record->isDependentType()) { 3744 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3745 MEnd = Record->method_end(); 3746 M != MEnd; ++M) { 3747 if (!M->isStatic()) 3748 DiagnoseHiddenVirtualMethods(Record, &*M); 3749 } 3750 } 3751 3752 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3753 // function that is not a constructor declares that member function to be 3754 // const. [...] The class of which that function is a member shall be 3755 // a literal type. 3756 // 3757 // If the class has virtual bases, any constexpr members will already have 3758 // been diagnosed by the checks performed on the member declaration, so 3759 // suppress this (less useful) diagnostic. 3760 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3761 !Record->isLiteral() && !Record->getNumVBases()) { 3762 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3763 MEnd = Record->method_end(); 3764 M != MEnd; ++M) { 3765 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 3766 switch (Record->getTemplateSpecializationKind()) { 3767 case TSK_ImplicitInstantiation: 3768 case TSK_ExplicitInstantiationDeclaration: 3769 case TSK_ExplicitInstantiationDefinition: 3770 // If a template instantiates to a non-literal type, but its members 3771 // instantiate to constexpr functions, the template is technically 3772 // ill-formed, but we allow it for sanity. 3773 continue; 3774 3775 case TSK_Undeclared: 3776 case TSK_ExplicitSpecialization: 3777 RequireLiteralType(M->getLocation(), Context.getRecordType(Record), 3778 diag::err_constexpr_method_non_literal); 3779 break; 3780 } 3781 3782 // Only produce one error per class. 3783 break; 3784 } 3785 } 3786 } 3787 3788 // Declare inherited constructors. We do this eagerly here because: 3789 // - The standard requires an eager diagnostic for conflicting inherited 3790 // constructors from different classes. 3791 // - The lazy declaration of the other implicit constructors is so as to not 3792 // waste space and performance on classes that are not meant to be 3793 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3794 // have inherited constructors. 3795 DeclareInheritedConstructors(Record); 3796 3797 if (!Record->isDependentType()) 3798 CheckExplicitlyDefaultedMethods(Record); 3799} 3800 3801void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3802 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3803 ME = Record->method_end(); 3804 MI != ME; ++MI) { 3805 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3806 switch (getSpecialMember(&*MI)) { 3807 case CXXDefaultConstructor: 3808 CheckExplicitlyDefaultedDefaultConstructor( 3809 cast<CXXConstructorDecl>(&*MI)); 3810 break; 3811 3812 case CXXDestructor: 3813 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(&*MI)); 3814 break; 3815 3816 case CXXCopyConstructor: 3817 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(&*MI)); 3818 break; 3819 3820 case CXXCopyAssignment: 3821 CheckExplicitlyDefaultedCopyAssignment(&*MI); 3822 break; 3823 3824 case CXXMoveConstructor: 3825 CheckExplicitlyDefaultedMoveConstructor(cast<CXXConstructorDecl>(&*MI)); 3826 break; 3827 3828 case CXXMoveAssignment: 3829 CheckExplicitlyDefaultedMoveAssignment(&*MI); 3830 break; 3831 3832 case CXXInvalid: 3833 llvm_unreachable("non-special member explicitly defaulted!"); 3834 } 3835 } 3836 } 3837 3838} 3839 3840void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3841 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3842 3843 // Whether this was the first-declared instance of the constructor. 3844 // This affects whether we implicitly add an exception spec (and, eventually, 3845 // constexpr). It is also ill-formed to explicitly default a constructor such 3846 // that it would be deleted. (C++0x [decl.fct.def.default]) 3847 bool First = CD == CD->getCanonicalDecl(); 3848 3849 bool HadError = false; 3850 if (CD->getNumParams() != 0) { 3851 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3852 << CD->getSourceRange(); 3853 HadError = true; 3854 } 3855 3856 ImplicitExceptionSpecification Spec 3857 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3858 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3859 if (EPI.ExceptionSpecType == EST_Delayed) { 3860 // Exception specification depends on some deferred part of the class. We'll 3861 // try again when the class's definition has been fully processed. 3862 return; 3863 } 3864 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3865 *ExceptionType = Context.getFunctionType( 3866 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3867 3868 // C++11 [dcl.fct.def.default]p2: 3869 // An explicitly-defaulted function may be declared constexpr only if it 3870 // would have been implicitly declared as constexpr, 3871 // Do not apply this rule to templates, since core issue 1358 makes such 3872 // functions always instantiate to constexpr functions. 3873 if (CD->isConstexpr() && 3874 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 3875 if (!CD->getParent()->defaultedDefaultConstructorIsConstexpr()) { 3876 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3877 << CXXDefaultConstructor; 3878 HadError = true; 3879 } 3880 } 3881 // and may have an explicit exception-specification only if it is compatible 3882 // with the exception-specification on the implicit declaration. 3883 if (CtorType->hasExceptionSpec()) { 3884 if (CheckEquivalentExceptionSpec( 3885 PDiag(diag::err_incorrect_defaulted_exception_spec) 3886 << CXXDefaultConstructor, 3887 PDiag(), 3888 ExceptionType, SourceLocation(), 3889 CtorType, CD->getLocation())) { 3890 HadError = true; 3891 } 3892 } 3893 3894 // If a function is explicitly defaulted on its first declaration, 3895 if (First) { 3896 // -- it is implicitly considered to be constexpr if the implicit 3897 // definition would be, 3898 CD->setConstexpr(CD->getParent()->defaultedDefaultConstructorIsConstexpr()); 3899 3900 // -- it is implicitly considered to have the same 3901 // exception-specification as if it had been implicitly declared 3902 // 3903 // FIXME: a compatible, but different, explicit exception specification 3904 // will be silently overridden. We should issue a warning if this happens. 3905 EPI.ExtInfo = CtorType->getExtInfo(); 3906 3907 // Such a function is also trivial if the implicitly-declared function 3908 // would have been. 3909 CD->setTrivial(CD->getParent()->hasTrivialDefaultConstructor()); 3910 } 3911 3912 if (HadError) { 3913 CD->setInvalidDecl(); 3914 return; 3915 } 3916 3917 if (ShouldDeleteSpecialMember(CD, CXXDefaultConstructor)) { 3918 if (First) { 3919 CD->setDeletedAsWritten(); 3920 } else { 3921 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3922 << CXXDefaultConstructor; 3923 CD->setInvalidDecl(); 3924 } 3925 } 3926} 3927 3928void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3929 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3930 3931 // Whether this was the first-declared instance of the constructor. 3932 bool First = CD == CD->getCanonicalDecl(); 3933 3934 bool HadError = false; 3935 if (CD->getNumParams() != 1) { 3936 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3937 << CD->getSourceRange(); 3938 HadError = true; 3939 } 3940 3941 ImplicitExceptionSpecification Spec(*this); 3942 bool Const; 3943 llvm::tie(Spec, Const) = 3944 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3945 3946 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3947 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3948 *ExceptionType = Context.getFunctionType( 3949 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3950 3951 // Check for parameter type matching. 3952 // This is a copy ctor so we know it's a cv-qualified reference to T. 3953 QualType ArgType = CtorType->getArgType(0); 3954 if (ArgType->getPointeeType().isVolatileQualified()) { 3955 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3956 HadError = true; 3957 } 3958 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3959 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3960 HadError = true; 3961 } 3962 3963 // C++11 [dcl.fct.def.default]p2: 3964 // An explicitly-defaulted function may be declared constexpr only if it 3965 // would have been implicitly declared as constexpr, 3966 // Do not apply this rule to templates, since core issue 1358 makes such 3967 // functions always instantiate to constexpr functions. 3968 if (CD->isConstexpr() && 3969 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 3970 if (!CD->getParent()->defaultedCopyConstructorIsConstexpr()) { 3971 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3972 << CXXCopyConstructor; 3973 HadError = true; 3974 } 3975 } 3976 // and may have an explicit exception-specification only if it is compatible 3977 // with the exception-specification on the implicit declaration. 3978 if (CtorType->hasExceptionSpec()) { 3979 if (CheckEquivalentExceptionSpec( 3980 PDiag(diag::err_incorrect_defaulted_exception_spec) 3981 << CXXCopyConstructor, 3982 PDiag(), 3983 ExceptionType, SourceLocation(), 3984 CtorType, CD->getLocation())) { 3985 HadError = true; 3986 } 3987 } 3988 3989 // If a function is explicitly defaulted on its first declaration, 3990 if (First) { 3991 // -- it is implicitly considered to be constexpr if the implicit 3992 // definition would be, 3993 CD->setConstexpr(CD->getParent()->defaultedCopyConstructorIsConstexpr()); 3994 3995 // -- it is implicitly considered to have the same 3996 // exception-specification as if it had been implicitly declared, and 3997 // 3998 // FIXME: a compatible, but different, explicit exception specification 3999 // will be silently overridden. We should issue a warning if this happens. 4000 EPI.ExtInfo = CtorType->getExtInfo(); 4001 4002 // -- [...] it shall have the same parameter type as if it had been 4003 // implicitly declared. 4004 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 4005 4006 // Such a function is also trivial if the implicitly-declared function 4007 // would have been. 4008 CD->setTrivial(CD->getParent()->hasTrivialCopyConstructor()); 4009 } 4010 4011 if (HadError) { 4012 CD->setInvalidDecl(); 4013 return; 4014 } 4015 4016 if (ShouldDeleteSpecialMember(CD, CXXCopyConstructor)) { 4017 if (First) { 4018 CD->setDeletedAsWritten(); 4019 } else { 4020 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 4021 << CXXCopyConstructor; 4022 CD->setInvalidDecl(); 4023 } 4024 } 4025} 4026 4027void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 4028 assert(MD->isExplicitlyDefaulted()); 4029 4030 // Whether this was the first-declared instance of the operator 4031 bool First = MD == MD->getCanonicalDecl(); 4032 4033 bool HadError = false; 4034 if (MD->getNumParams() != 1) { 4035 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 4036 << MD->getSourceRange(); 4037 HadError = true; 4038 } 4039 4040 QualType ReturnType = 4041 MD->getType()->getAs<FunctionType>()->getResultType(); 4042 if (!ReturnType->isLValueReferenceType() || 4043 !Context.hasSameType( 4044 Context.getCanonicalType(ReturnType->getPointeeType()), 4045 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 4046 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 4047 HadError = true; 4048 } 4049 4050 ImplicitExceptionSpecification Spec(*this); 4051 bool Const; 4052 llvm::tie(Spec, Const) = 4053 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 4054 4055 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4056 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4057 *ExceptionType = Context.getFunctionType( 4058 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4059 4060 QualType ArgType = OperType->getArgType(0); 4061 if (!ArgType->isLValueReferenceType()) { 4062 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4063 HadError = true; 4064 } else { 4065 if (ArgType->getPointeeType().isVolatileQualified()) { 4066 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 4067 HadError = true; 4068 } 4069 if (ArgType->getPointeeType().isConstQualified() && !Const) { 4070 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 4071 HadError = true; 4072 } 4073 } 4074 4075 if (OperType->getTypeQuals()) { 4076 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 4077 HadError = true; 4078 } 4079 4080 if (OperType->hasExceptionSpec()) { 4081 if (CheckEquivalentExceptionSpec( 4082 PDiag(diag::err_incorrect_defaulted_exception_spec) 4083 << CXXCopyAssignment, 4084 PDiag(), 4085 ExceptionType, SourceLocation(), 4086 OperType, MD->getLocation())) { 4087 HadError = true; 4088 } 4089 } 4090 if (First) { 4091 // We set the declaration to have the computed exception spec here. 4092 // We duplicate the one parameter type. 4093 EPI.RefQualifier = OperType->getRefQualifier(); 4094 EPI.ExtInfo = OperType->getExtInfo(); 4095 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4096 4097 // Such a function is also trivial if the implicitly-declared function 4098 // would have been. 4099 MD->setTrivial(MD->getParent()->hasTrivialCopyAssignment()); 4100 } 4101 4102 if (HadError) { 4103 MD->setInvalidDecl(); 4104 return; 4105 } 4106 4107 if (ShouldDeleteSpecialMember(MD, CXXCopyAssignment)) { 4108 if (First) { 4109 MD->setDeletedAsWritten(); 4110 } else { 4111 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4112 << CXXCopyAssignment; 4113 MD->setInvalidDecl(); 4114 } 4115 } 4116} 4117 4118void Sema::CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *CD) { 4119 assert(CD->isExplicitlyDefaulted() && CD->isMoveConstructor()); 4120 4121 // Whether this was the first-declared instance of the constructor. 4122 bool First = CD == CD->getCanonicalDecl(); 4123 4124 bool HadError = false; 4125 if (CD->getNumParams() != 1) { 4126 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_params) 4127 << CD->getSourceRange(); 4128 HadError = true; 4129 } 4130 4131 ImplicitExceptionSpecification Spec( 4132 ComputeDefaultedMoveCtorExceptionSpec(CD->getParent())); 4133 4134 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4135 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 4136 *ExceptionType = Context.getFunctionType( 4137 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4138 4139 // Check for parameter type matching. 4140 // This is a move ctor so we know it's a cv-qualified rvalue reference to T. 4141 QualType ArgType = CtorType->getArgType(0); 4142 if (ArgType->getPointeeType().isVolatileQualified()) { 4143 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_volatile_param); 4144 HadError = true; 4145 } 4146 if (ArgType->getPointeeType().isConstQualified()) { 4147 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_const_param); 4148 HadError = true; 4149 } 4150 4151 // C++11 [dcl.fct.def.default]p2: 4152 // An explicitly-defaulted function may be declared constexpr only if it 4153 // would have been implicitly declared as constexpr, 4154 // Do not apply this rule to templates, since core issue 1358 makes such 4155 // functions always instantiate to constexpr functions. 4156 if (CD->isConstexpr() && 4157 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4158 if (!CD->getParent()->defaultedMoveConstructorIsConstexpr()) { 4159 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 4160 << CXXMoveConstructor; 4161 HadError = true; 4162 } 4163 } 4164 // and may have an explicit exception-specification only if it is compatible 4165 // with the exception-specification on the implicit declaration. 4166 if (CtorType->hasExceptionSpec()) { 4167 if (CheckEquivalentExceptionSpec( 4168 PDiag(diag::err_incorrect_defaulted_exception_spec) 4169 << CXXMoveConstructor, 4170 PDiag(), 4171 ExceptionType, SourceLocation(), 4172 CtorType, CD->getLocation())) { 4173 HadError = true; 4174 } 4175 } 4176 4177 // If a function is explicitly defaulted on its first declaration, 4178 if (First) { 4179 // -- it is implicitly considered to be constexpr if the implicit 4180 // definition would be, 4181 CD->setConstexpr(CD->getParent()->defaultedMoveConstructorIsConstexpr()); 4182 4183 // -- it is implicitly considered to have the same 4184 // exception-specification as if it had been implicitly declared, and 4185 // 4186 // FIXME: a compatible, but different, explicit exception specification 4187 // will be silently overridden. We should issue a warning if this happens. 4188 EPI.ExtInfo = CtorType->getExtInfo(); 4189 4190 // -- [...] it shall have the same parameter type as if it had been 4191 // implicitly declared. 4192 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 4193 4194 // Such a function is also trivial if the implicitly-declared function 4195 // would have been. 4196 CD->setTrivial(CD->getParent()->hasTrivialMoveConstructor()); 4197 } 4198 4199 if (HadError) { 4200 CD->setInvalidDecl(); 4201 return; 4202 } 4203 4204 if (ShouldDeleteSpecialMember(CD, CXXMoveConstructor)) { 4205 if (First) { 4206 CD->setDeletedAsWritten(); 4207 } else { 4208 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 4209 << CXXMoveConstructor; 4210 CD->setInvalidDecl(); 4211 } 4212 } 4213} 4214 4215void Sema::CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *MD) { 4216 assert(MD->isExplicitlyDefaulted()); 4217 4218 // Whether this was the first-declared instance of the operator 4219 bool First = MD == MD->getCanonicalDecl(); 4220 4221 bool HadError = false; 4222 if (MD->getNumParams() != 1) { 4223 Diag(MD->getLocation(), diag::err_defaulted_move_assign_params) 4224 << MD->getSourceRange(); 4225 HadError = true; 4226 } 4227 4228 QualType ReturnType = 4229 MD->getType()->getAs<FunctionType>()->getResultType(); 4230 if (!ReturnType->isLValueReferenceType() || 4231 !Context.hasSameType( 4232 Context.getCanonicalType(ReturnType->getPointeeType()), 4233 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 4234 Diag(MD->getLocation(), diag::err_defaulted_move_assign_return_type); 4235 HadError = true; 4236 } 4237 4238 ImplicitExceptionSpecification Spec( 4239 ComputeDefaultedMoveCtorExceptionSpec(MD->getParent())); 4240 4241 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4242 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4243 *ExceptionType = Context.getFunctionType( 4244 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4245 4246 QualType ArgType = OperType->getArgType(0); 4247 if (!ArgType->isRValueReferenceType()) { 4248 Diag(MD->getLocation(), diag::err_defaulted_move_assign_not_ref); 4249 HadError = true; 4250 } else { 4251 if (ArgType->getPointeeType().isVolatileQualified()) { 4252 Diag(MD->getLocation(), diag::err_defaulted_move_assign_volatile_param); 4253 HadError = true; 4254 } 4255 if (ArgType->getPointeeType().isConstQualified()) { 4256 Diag(MD->getLocation(), diag::err_defaulted_move_assign_const_param); 4257 HadError = true; 4258 } 4259 } 4260 4261 if (OperType->getTypeQuals()) { 4262 Diag(MD->getLocation(), diag::err_defaulted_move_assign_quals); 4263 HadError = true; 4264 } 4265 4266 if (OperType->hasExceptionSpec()) { 4267 if (CheckEquivalentExceptionSpec( 4268 PDiag(diag::err_incorrect_defaulted_exception_spec) 4269 << CXXMoveAssignment, 4270 PDiag(), 4271 ExceptionType, SourceLocation(), 4272 OperType, MD->getLocation())) { 4273 HadError = true; 4274 } 4275 } 4276 if (First) { 4277 // We set the declaration to have the computed exception spec here. 4278 // We duplicate the one parameter type. 4279 EPI.RefQualifier = OperType->getRefQualifier(); 4280 EPI.ExtInfo = OperType->getExtInfo(); 4281 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4282 4283 // Such a function is also trivial if the implicitly-declared function 4284 // would have been. 4285 MD->setTrivial(MD->getParent()->hasTrivialMoveAssignment()); 4286 } 4287 4288 if (HadError) { 4289 MD->setInvalidDecl(); 4290 return; 4291 } 4292 4293 if (ShouldDeleteSpecialMember(MD, CXXMoveAssignment)) { 4294 if (First) { 4295 MD->setDeletedAsWritten(); 4296 } else { 4297 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4298 << CXXMoveAssignment; 4299 MD->setInvalidDecl(); 4300 } 4301 } 4302} 4303 4304void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 4305 assert(DD->isExplicitlyDefaulted()); 4306 4307 // Whether this was the first-declared instance of the destructor. 4308 bool First = DD == DD->getCanonicalDecl(); 4309 4310 ImplicitExceptionSpecification Spec 4311 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 4312 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4313 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 4314 *ExceptionType = Context.getFunctionType( 4315 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4316 4317 if (DtorType->hasExceptionSpec()) { 4318 if (CheckEquivalentExceptionSpec( 4319 PDiag(diag::err_incorrect_defaulted_exception_spec) 4320 << CXXDestructor, 4321 PDiag(), 4322 ExceptionType, SourceLocation(), 4323 DtorType, DD->getLocation())) { 4324 DD->setInvalidDecl(); 4325 return; 4326 } 4327 } 4328 if (First) { 4329 // We set the declaration to have the computed exception spec here. 4330 // There are no parameters. 4331 EPI.ExtInfo = DtorType->getExtInfo(); 4332 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 4333 4334 // Such a function is also trivial if the implicitly-declared function 4335 // would have been. 4336 DD->setTrivial(DD->getParent()->hasTrivialDestructor()); 4337 } 4338 4339 if (ShouldDeleteSpecialMember(DD, CXXDestructor)) { 4340 if (First) { 4341 DD->setDeletedAsWritten(); 4342 } else { 4343 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 4344 << CXXDestructor; 4345 DD->setInvalidDecl(); 4346 } 4347 } 4348} 4349 4350namespace { 4351struct SpecialMemberDeletionInfo { 4352 Sema &S; 4353 CXXMethodDecl *MD; 4354 Sema::CXXSpecialMember CSM; 4355 bool Diagnose; 4356 4357 // Properties of the special member, computed for convenience. 4358 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4359 SourceLocation Loc; 4360 4361 bool AllFieldsAreConst; 4362 4363 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4364 Sema::CXXSpecialMember CSM, bool Diagnose) 4365 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose), 4366 IsConstructor(false), IsAssignment(false), IsMove(false), 4367 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4368 AllFieldsAreConst(true) { 4369 switch (CSM) { 4370 case Sema::CXXDefaultConstructor: 4371 case Sema::CXXCopyConstructor: 4372 IsConstructor = true; 4373 break; 4374 case Sema::CXXMoveConstructor: 4375 IsConstructor = true; 4376 IsMove = true; 4377 break; 4378 case Sema::CXXCopyAssignment: 4379 IsAssignment = true; 4380 break; 4381 case Sema::CXXMoveAssignment: 4382 IsAssignment = true; 4383 IsMove = true; 4384 break; 4385 case Sema::CXXDestructor: 4386 break; 4387 case Sema::CXXInvalid: 4388 llvm_unreachable("invalid special member kind"); 4389 } 4390 4391 if (MD->getNumParams()) { 4392 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4393 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4394 } 4395 } 4396 4397 bool inUnion() const { return MD->getParent()->isUnion(); } 4398 4399 /// Look up the corresponding special member in the given class. 4400 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class) { 4401 unsigned TQ = MD->getTypeQualifiers(); 4402 return S.LookupSpecialMember(Class, CSM, ConstArg, VolatileArg, 4403 MD->getRefQualifier() == RQ_RValue, 4404 TQ & Qualifiers::Const, 4405 TQ & Qualifiers::Volatile); 4406 } 4407 4408 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; 4409 4410 bool shouldDeleteForBase(CXXBaseSpecifier *Base); 4411 bool shouldDeleteForField(FieldDecl *FD); 4412 bool shouldDeleteForAllConstMembers(); 4413 4414 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj); 4415 bool shouldDeleteForSubobjectCall(Subobject Subobj, 4416 Sema::SpecialMemberOverloadResult *SMOR, 4417 bool IsDtorCallInCtor); 4418 4419 bool isAccessible(Subobject Subobj, CXXMethodDecl *D); 4420}; 4421} 4422 4423/// Is the given special member inaccessible when used on the given 4424/// sub-object. 4425bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, 4426 CXXMethodDecl *target) { 4427 /// If we're operating on a base class, the object type is the 4428 /// type of this special member. 4429 QualType objectTy; 4430 AccessSpecifier access = target->getAccess();; 4431 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { 4432 objectTy = S.Context.getTypeDeclType(MD->getParent()); 4433 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); 4434 4435 // If we're operating on a field, the object type is the type of the field. 4436 } else { 4437 objectTy = S.Context.getTypeDeclType(target->getParent()); 4438 } 4439 4440 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy); 4441} 4442 4443/// Check whether we should delete a special member due to the implicit 4444/// definition containing a call to a special member of a subobject. 4445bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( 4446 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR, 4447 bool IsDtorCallInCtor) { 4448 CXXMethodDecl *Decl = SMOR->getMethod(); 4449 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4450 4451 int DiagKind = -1; 4452 4453 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) 4454 DiagKind = !Decl ? 0 : 1; 4455 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4456 DiagKind = 2; 4457 else if (!isAccessible(Subobj, Decl)) 4458 DiagKind = 3; 4459 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && 4460 !Decl->isTrivial()) { 4461 // A member of a union must have a trivial corresponding special member. 4462 // As a weird special case, a destructor call from a union's constructor 4463 // must be accessible and non-deleted, but need not be trivial. Such a 4464 // destructor is never actually called, but is semantically checked as 4465 // if it were. 4466 DiagKind = 4; 4467 } 4468 4469 if (DiagKind == -1) 4470 return false; 4471 4472 if (Diagnose) { 4473 if (Field) { 4474 S.Diag(Field->getLocation(), 4475 diag::note_deleted_special_member_class_subobject) 4476 << CSM << MD->getParent() << /*IsField*/true 4477 << Field << DiagKind << IsDtorCallInCtor; 4478 } else { 4479 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); 4480 S.Diag(Base->getLocStart(), 4481 diag::note_deleted_special_member_class_subobject) 4482 << CSM << MD->getParent() << /*IsField*/false 4483 << Base->getType() << DiagKind << IsDtorCallInCtor; 4484 } 4485 4486 if (DiagKind == 1) 4487 S.NoteDeletedFunction(Decl); 4488 // FIXME: Explain inaccessibility if DiagKind == 3. 4489 } 4490 4491 return true; 4492} 4493 4494/// Check whether we should delete a special member function due to having a 4495/// direct or virtual base class or static data member of class type M. 4496bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 4497 CXXRecordDecl *Class, Subobject Subobj) { 4498 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4499 4500 // C++11 [class.ctor]p5: 4501 // -- any direct or virtual base class, or non-static data member with no 4502 // brace-or-equal-initializer, has class type M (or array thereof) and 4503 // either M has no default constructor or overload resolution as applied 4504 // to M's default constructor results in an ambiguity or in a function 4505 // that is deleted or inaccessible 4506 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4507 // -- a direct or virtual base class B that cannot be copied/moved because 4508 // overload resolution, as applied to B's corresponding special member, 4509 // results in an ambiguity or a function that is deleted or inaccessible 4510 // from the defaulted special member 4511 // C++11 [class.dtor]p5: 4512 // -- any direct or virtual base class [...] has a type with a destructor 4513 // that is deleted or inaccessible 4514 if (!(CSM == Sema::CXXDefaultConstructor && 4515 Field && Field->hasInClassInitializer()) && 4516 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class), false)) 4517 return true; 4518 4519 // C++11 [class.ctor]p5, C++11 [class.copy]p11: 4520 // -- any direct or virtual base class or non-static data member has a 4521 // type with a destructor that is deleted or inaccessible 4522 if (IsConstructor) { 4523 Sema::SpecialMemberOverloadResult *SMOR = 4524 S.LookupSpecialMember(Class, Sema::CXXDestructor, 4525 false, false, false, false, false); 4526 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) 4527 return true; 4528 } 4529 4530 return false; 4531} 4532 4533/// Check whether we should delete a special member function due to the class 4534/// having a particular direct or virtual base class. 4535bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { 4536 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); 4537 return shouldDeleteForClassSubobject(BaseClass, Base); 4538} 4539 4540/// Check whether we should delete a special member function due to the class 4541/// having a particular non-static data member. 4542bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4543 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4544 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4545 4546 if (CSM == Sema::CXXDefaultConstructor) { 4547 // For a default constructor, all references must be initialized in-class 4548 // and, if a union, it must have a non-const member. 4549 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { 4550 if (Diagnose) 4551 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4552 << MD->getParent() << FD << FieldType << /*Reference*/0; 4553 return true; 4554 } 4555 // C++11 [class.ctor]p5: any non-variant non-static data member of 4556 // const-qualified type (or array thereof) with no 4557 // brace-or-equal-initializer does not have a user-provided default 4558 // constructor. 4559 if (!inUnion() && FieldType.isConstQualified() && 4560 !FD->hasInClassInitializer() && 4561 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { 4562 if (Diagnose) 4563 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4564 << MD->getParent() << FD << FD->getType() << /*Const*/1; 4565 return true; 4566 } 4567 4568 if (inUnion() && !FieldType.isConstQualified()) 4569 AllFieldsAreConst = false; 4570 } else if (CSM == Sema::CXXCopyConstructor) { 4571 // For a copy constructor, data members must not be of rvalue reference 4572 // type. 4573 if (FieldType->isRValueReferenceType()) { 4574 if (Diagnose) 4575 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) 4576 << MD->getParent() << FD << FieldType; 4577 return true; 4578 } 4579 } else if (IsAssignment) { 4580 // For an assignment operator, data members must not be of reference type. 4581 if (FieldType->isReferenceType()) { 4582 if (Diagnose) 4583 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4584 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0; 4585 return true; 4586 } 4587 if (!FieldRecord && FieldType.isConstQualified()) { 4588 // C++11 [class.copy]p23: 4589 // -- a non-static data member of const non-class type (or array thereof) 4590 if (Diagnose) 4591 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4592 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1; 4593 return true; 4594 } 4595 } 4596 4597 if (FieldRecord) { 4598 // Some additional restrictions exist on the variant members. 4599 if (!inUnion() && FieldRecord->isUnion() && 4600 FieldRecord->isAnonymousStructOrUnion()) { 4601 bool AllVariantFieldsAreConst = true; 4602 4603 // FIXME: Handle anonymous unions declared within anonymous unions. 4604 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4605 UE = FieldRecord->field_end(); 4606 UI != UE; ++UI) { 4607 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4608 4609 if (!UnionFieldType.isConstQualified()) 4610 AllVariantFieldsAreConst = false; 4611 4612 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 4613 if (UnionFieldRecord && 4614 shouldDeleteForClassSubobject(UnionFieldRecord, &*UI)) 4615 return true; 4616 } 4617 4618 // At least one member in each anonymous union must be non-const 4619 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 4620 FieldRecord->field_begin() != FieldRecord->field_end()) { 4621 if (Diagnose) 4622 S.Diag(FieldRecord->getLocation(), 4623 diag::note_deleted_default_ctor_all_const) 4624 << MD->getParent() << /*anonymous union*/1; 4625 return true; 4626 } 4627 4628 // Don't check the implicit member of the anonymous union type. 4629 // This is technically non-conformant, but sanity demands it. 4630 return false; 4631 } 4632 4633 if (shouldDeleteForClassSubobject(FieldRecord, FD)) 4634 return true; 4635 } 4636 4637 return false; 4638} 4639 4640/// C++11 [class.ctor] p5: 4641/// A defaulted default constructor for a class X is defined as deleted if 4642/// X is a union and all of its variant members are of const-qualified type. 4643bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4644 // This is a silly definition, because it gives an empty union a deleted 4645 // default constructor. Don't do that. 4646 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 4647 (MD->getParent()->field_begin() != MD->getParent()->field_end())) { 4648 if (Diagnose) 4649 S.Diag(MD->getParent()->getLocation(), 4650 diag::note_deleted_default_ctor_all_const) 4651 << MD->getParent() << /*not anonymous union*/0; 4652 return true; 4653 } 4654 return false; 4655} 4656 4657/// Determine whether a defaulted special member function should be defined as 4658/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4659/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4660bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, 4661 bool Diagnose) { 4662 assert(!MD->isInvalidDecl()); 4663 CXXRecordDecl *RD = MD->getParent(); 4664 assert(!RD->isDependentType() && "do deletion after instantiation"); 4665 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4666 return false; 4667 4668 // C++11 [expr.lambda.prim]p19: 4669 // The closure type associated with a lambda-expression has a 4670 // deleted (8.4.3) default constructor and a deleted copy 4671 // assignment operator. 4672 if (RD->isLambda() && 4673 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { 4674 if (Diagnose) 4675 Diag(RD->getLocation(), diag::note_lambda_decl); 4676 return true; 4677 } 4678 4679 // For an anonymous struct or union, the copy and assignment special members 4680 // will never be used, so skip the check. For an anonymous union declared at 4681 // namespace scope, the constructor and destructor are used. 4682 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4683 RD->isAnonymousStructOrUnion()) 4684 return false; 4685 4686 // C++11 [class.copy]p7, p18: 4687 // If the class definition declares a move constructor or move assignment 4688 // operator, an implicitly declared copy constructor or copy assignment 4689 // operator is defined as deleted. 4690 if (MD->isImplicit() && 4691 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { 4692 CXXMethodDecl *UserDeclaredMove = 0; 4693 4694 // In Microsoft mode, a user-declared move only causes the deletion of the 4695 // corresponding copy operation, not both copy operations. 4696 if (RD->hasUserDeclaredMoveConstructor() && 4697 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) { 4698 if (!Diagnose) return true; 4699 UserDeclaredMove = RD->getMoveConstructor(); 4700 assert(UserDeclaredMove); 4701 } else if (RD->hasUserDeclaredMoveAssignment() && 4702 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) { 4703 if (!Diagnose) return true; 4704 UserDeclaredMove = RD->getMoveAssignmentOperator(); 4705 assert(UserDeclaredMove); 4706 } 4707 4708 if (UserDeclaredMove) { 4709 Diag(UserDeclaredMove->getLocation(), 4710 diag::note_deleted_copy_user_declared_move) 4711 << (CSM == CXXCopyAssignment) << RD 4712 << UserDeclaredMove->isMoveAssignmentOperator(); 4713 return true; 4714 } 4715 } 4716 4717 // Do access control from the special member function 4718 ContextRAII MethodContext(*this, MD); 4719 4720 // C++11 [class.dtor]p5: 4721 // -- for a virtual destructor, lookup of the non-array deallocation function 4722 // results in an ambiguity or in a function that is deleted or inaccessible 4723 if (CSM == CXXDestructor && MD->isVirtual()) { 4724 FunctionDecl *OperatorDelete = 0; 4725 DeclarationName Name = 4726 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4727 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 4728 OperatorDelete, false)) { 4729 if (Diagnose) 4730 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); 4731 return true; 4732 } 4733 } 4734 4735 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose); 4736 4737 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4738 BE = RD->bases_end(); BI != BE; ++BI) 4739 if (!BI->isVirtual() && 4740 SMI.shouldDeleteForBase(BI)) 4741 return true; 4742 4743 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4744 BE = RD->vbases_end(); BI != BE; ++BI) 4745 if (SMI.shouldDeleteForBase(BI)) 4746 return true; 4747 4748 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4749 FE = RD->field_end(); FI != FE; ++FI) 4750 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 4751 SMI.shouldDeleteForField(&*FI)) 4752 return true; 4753 4754 if (SMI.shouldDeleteForAllConstMembers()) 4755 return true; 4756 4757 return false; 4758} 4759 4760/// \brief Data used with FindHiddenVirtualMethod 4761namespace { 4762 struct FindHiddenVirtualMethodData { 4763 Sema *S; 4764 CXXMethodDecl *Method; 4765 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4766 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4767 }; 4768} 4769 4770/// \brief Member lookup function that determines whether a given C++ 4771/// method overloads virtual methods in a base class without overriding any, 4772/// to be used with CXXRecordDecl::lookupInBases(). 4773static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4774 CXXBasePath &Path, 4775 void *UserData) { 4776 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4777 4778 FindHiddenVirtualMethodData &Data 4779 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4780 4781 DeclarationName Name = Data.Method->getDeclName(); 4782 assert(Name.getNameKind() == DeclarationName::Identifier); 4783 4784 bool foundSameNameMethod = false; 4785 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4786 for (Path.Decls = BaseRecord->lookup(Name); 4787 Path.Decls.first != Path.Decls.second; 4788 ++Path.Decls.first) { 4789 NamedDecl *D = *Path.Decls.first; 4790 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4791 MD = MD->getCanonicalDecl(); 4792 foundSameNameMethod = true; 4793 // Interested only in hidden virtual methods. 4794 if (!MD->isVirtual()) 4795 continue; 4796 // If the method we are checking overrides a method from its base 4797 // don't warn about the other overloaded methods. 4798 if (!Data.S->IsOverload(Data.Method, MD, false)) 4799 return true; 4800 // Collect the overload only if its hidden. 4801 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4802 overloadedMethods.push_back(MD); 4803 } 4804 } 4805 4806 if (foundSameNameMethod) 4807 Data.OverloadedMethods.append(overloadedMethods.begin(), 4808 overloadedMethods.end()); 4809 return foundSameNameMethod; 4810} 4811 4812/// \brief See if a method overloads virtual methods in a base class without 4813/// overriding any. 4814void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4815 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4816 MD->getLocation()) == DiagnosticsEngine::Ignored) 4817 return; 4818 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4819 return; 4820 4821 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4822 /*bool RecordPaths=*/false, 4823 /*bool DetectVirtual=*/false); 4824 FindHiddenVirtualMethodData Data; 4825 Data.Method = MD; 4826 Data.S = this; 4827 4828 // Keep the base methods that were overriden or introduced in the subclass 4829 // by 'using' in a set. A base method not in this set is hidden. 4830 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4831 res.first != res.second; ++res.first) { 4832 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4833 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4834 E = MD->end_overridden_methods(); 4835 I != E; ++I) 4836 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4837 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4838 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4839 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4840 } 4841 4842 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4843 !Data.OverloadedMethods.empty()) { 4844 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4845 << MD << (Data.OverloadedMethods.size() > 1); 4846 4847 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4848 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4849 Diag(overloadedMD->getLocation(), 4850 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4851 } 4852 } 4853} 4854 4855void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4856 Decl *TagDecl, 4857 SourceLocation LBrac, 4858 SourceLocation RBrac, 4859 AttributeList *AttrList) { 4860 if (!TagDecl) 4861 return; 4862 4863 AdjustDeclIfTemplate(TagDecl); 4864 4865 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4866 // strict aliasing violation! 4867 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4868 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4869 4870 CheckCompletedCXXClass( 4871 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4872} 4873 4874/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4875/// special functions, such as the default constructor, copy 4876/// constructor, or destructor, to the given C++ class (C++ 4877/// [special]p1). This routine can only be executed just before the 4878/// definition of the class is complete. 4879void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4880 if (!ClassDecl->hasUserDeclaredConstructor()) 4881 ++ASTContext::NumImplicitDefaultConstructors; 4882 4883 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4884 ++ASTContext::NumImplicitCopyConstructors; 4885 4886 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 4887 ++ASTContext::NumImplicitMoveConstructors; 4888 4889 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4890 ++ASTContext::NumImplicitCopyAssignmentOperators; 4891 4892 // If we have a dynamic class, then the copy assignment operator may be 4893 // virtual, so we have to declare it immediately. This ensures that, e.g., 4894 // it shows up in the right place in the vtable and that we diagnose 4895 // problems with the implicit exception specification. 4896 if (ClassDecl->isDynamicClass()) 4897 DeclareImplicitCopyAssignment(ClassDecl); 4898 } 4899 4900 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()) { 4901 ++ASTContext::NumImplicitMoveAssignmentOperators; 4902 4903 // Likewise for the move assignment operator. 4904 if (ClassDecl->isDynamicClass()) 4905 DeclareImplicitMoveAssignment(ClassDecl); 4906 } 4907 4908 if (!ClassDecl->hasUserDeclaredDestructor()) { 4909 ++ASTContext::NumImplicitDestructors; 4910 4911 // If we have a dynamic class, then the destructor may be virtual, so we 4912 // have to declare the destructor immediately. This ensures that, e.g., it 4913 // shows up in the right place in the vtable and that we diagnose problems 4914 // with the implicit exception specification. 4915 if (ClassDecl->isDynamicClass()) 4916 DeclareImplicitDestructor(ClassDecl); 4917 } 4918} 4919 4920void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4921 if (!D) 4922 return; 4923 4924 int NumParamList = D->getNumTemplateParameterLists(); 4925 for (int i = 0; i < NumParamList; i++) { 4926 TemplateParameterList* Params = D->getTemplateParameterList(i); 4927 for (TemplateParameterList::iterator Param = Params->begin(), 4928 ParamEnd = Params->end(); 4929 Param != ParamEnd; ++Param) { 4930 NamedDecl *Named = cast<NamedDecl>(*Param); 4931 if (Named->getDeclName()) { 4932 S->AddDecl(Named); 4933 IdResolver.AddDecl(Named); 4934 } 4935 } 4936 } 4937} 4938 4939void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4940 if (!D) 4941 return; 4942 4943 TemplateParameterList *Params = 0; 4944 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4945 Params = Template->getTemplateParameters(); 4946 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4947 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4948 Params = PartialSpec->getTemplateParameters(); 4949 else 4950 return; 4951 4952 for (TemplateParameterList::iterator Param = Params->begin(), 4953 ParamEnd = Params->end(); 4954 Param != ParamEnd; ++Param) { 4955 NamedDecl *Named = cast<NamedDecl>(*Param); 4956 if (Named->getDeclName()) { 4957 S->AddDecl(Named); 4958 IdResolver.AddDecl(Named); 4959 } 4960 } 4961} 4962 4963void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4964 if (!RecordD) return; 4965 AdjustDeclIfTemplate(RecordD); 4966 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4967 PushDeclContext(S, Record); 4968} 4969 4970void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4971 if (!RecordD) return; 4972 PopDeclContext(); 4973} 4974 4975/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4976/// parsing a top-level (non-nested) C++ class, and we are now 4977/// parsing those parts of the given Method declaration that could 4978/// not be parsed earlier (C++ [class.mem]p2), such as default 4979/// arguments. This action should enter the scope of the given 4980/// Method declaration as if we had just parsed the qualified method 4981/// name. However, it should not bring the parameters into scope; 4982/// that will be performed by ActOnDelayedCXXMethodParameter. 4983void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4984} 4985 4986/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4987/// C++ method declaration. We're (re-)introducing the given 4988/// function parameter into scope for use in parsing later parts of 4989/// the method declaration. For example, we could see an 4990/// ActOnParamDefaultArgument event for this parameter. 4991void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4992 if (!ParamD) 4993 return; 4994 4995 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4996 4997 // If this parameter has an unparsed default argument, clear it out 4998 // to make way for the parsed default argument. 4999 if (Param->hasUnparsedDefaultArg()) 5000 Param->setDefaultArg(0); 5001 5002 S->AddDecl(Param); 5003 if (Param->getDeclName()) 5004 IdResolver.AddDecl(Param); 5005} 5006 5007/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 5008/// processing the delayed method declaration for Method. The method 5009/// declaration is now considered finished. There may be a separate 5010/// ActOnStartOfFunctionDef action later (not necessarily 5011/// immediately!) for this method, if it was also defined inside the 5012/// class body. 5013void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5014 if (!MethodD) 5015 return; 5016 5017 AdjustDeclIfTemplate(MethodD); 5018 5019 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5020 5021 // Now that we have our default arguments, check the constructor 5022 // again. It could produce additional diagnostics or affect whether 5023 // the class has implicitly-declared destructors, among other 5024 // things. 5025 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5026 CheckConstructor(Constructor); 5027 5028 // Check the default arguments, which we may have added. 5029 if (!Method->isInvalidDecl()) 5030 CheckCXXDefaultArguments(Method); 5031} 5032 5033/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5034/// the well-formedness of the constructor declarator @p D with type @p 5035/// R. If there are any errors in the declarator, this routine will 5036/// emit diagnostics and set the invalid bit to true. In any case, the type 5037/// will be updated to reflect a well-formed type for the constructor and 5038/// returned. 5039QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5040 StorageClass &SC) { 5041 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5042 5043 // C++ [class.ctor]p3: 5044 // A constructor shall not be virtual (10.3) or static (9.4). A 5045 // constructor can be invoked for a const, volatile or const 5046 // volatile object. A constructor shall not be declared const, 5047 // volatile, or const volatile (9.3.2). 5048 if (isVirtual) { 5049 if (!D.isInvalidType()) 5050 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5051 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5052 << SourceRange(D.getIdentifierLoc()); 5053 D.setInvalidType(); 5054 } 5055 if (SC == SC_Static) { 5056 if (!D.isInvalidType()) 5057 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5058 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5059 << SourceRange(D.getIdentifierLoc()); 5060 D.setInvalidType(); 5061 SC = SC_None; 5062 } 5063 5064 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5065 if (FTI.TypeQuals != 0) { 5066 if (FTI.TypeQuals & Qualifiers::Const) 5067 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5068 << "const" << SourceRange(D.getIdentifierLoc()); 5069 if (FTI.TypeQuals & Qualifiers::Volatile) 5070 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5071 << "volatile" << SourceRange(D.getIdentifierLoc()); 5072 if (FTI.TypeQuals & Qualifiers::Restrict) 5073 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5074 << "restrict" << SourceRange(D.getIdentifierLoc()); 5075 D.setInvalidType(); 5076 } 5077 5078 // C++0x [class.ctor]p4: 5079 // A constructor shall not be declared with a ref-qualifier. 5080 if (FTI.hasRefQualifier()) { 5081 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5082 << FTI.RefQualifierIsLValueRef 5083 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5084 D.setInvalidType(); 5085 } 5086 5087 // Rebuild the function type "R" without any type qualifiers (in 5088 // case any of the errors above fired) and with "void" as the 5089 // return type, since constructors don't have return types. 5090 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5091 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5092 return R; 5093 5094 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5095 EPI.TypeQuals = 0; 5096 EPI.RefQualifier = RQ_None; 5097 5098 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5099 Proto->getNumArgs(), EPI); 5100} 5101 5102/// CheckConstructor - Checks a fully-formed constructor for 5103/// well-formedness, issuing any diagnostics required. Returns true if 5104/// the constructor declarator is invalid. 5105void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5106 CXXRecordDecl *ClassDecl 5107 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5108 if (!ClassDecl) 5109 return Constructor->setInvalidDecl(); 5110 5111 // C++ [class.copy]p3: 5112 // A declaration of a constructor for a class X is ill-formed if 5113 // its first parameter is of type (optionally cv-qualified) X and 5114 // either there are no other parameters or else all other 5115 // parameters have default arguments. 5116 if (!Constructor->isInvalidDecl() && 5117 ((Constructor->getNumParams() == 1) || 5118 (Constructor->getNumParams() > 1 && 5119 Constructor->getParamDecl(1)->hasDefaultArg())) && 5120 Constructor->getTemplateSpecializationKind() 5121 != TSK_ImplicitInstantiation) { 5122 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5123 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5124 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5125 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5126 const char *ConstRef 5127 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5128 : " const &"; 5129 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5130 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5131 5132 // FIXME: Rather that making the constructor invalid, we should endeavor 5133 // to fix the type. 5134 Constructor->setInvalidDecl(); 5135 } 5136 } 5137} 5138 5139/// CheckDestructor - Checks a fully-formed destructor definition for 5140/// well-formedness, issuing any diagnostics required. Returns true 5141/// on error. 5142bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5143 CXXRecordDecl *RD = Destructor->getParent(); 5144 5145 if (Destructor->isVirtual()) { 5146 SourceLocation Loc; 5147 5148 if (!Destructor->isImplicit()) 5149 Loc = Destructor->getLocation(); 5150 else 5151 Loc = RD->getLocation(); 5152 5153 // If we have a virtual destructor, look up the deallocation function 5154 FunctionDecl *OperatorDelete = 0; 5155 DeclarationName Name = 5156 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5157 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5158 return true; 5159 5160 MarkFunctionReferenced(Loc, OperatorDelete); 5161 5162 Destructor->setOperatorDelete(OperatorDelete); 5163 } 5164 5165 return false; 5166} 5167 5168static inline bool 5169FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5170 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5171 FTI.ArgInfo[0].Param && 5172 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5173} 5174 5175/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5176/// the well-formednes of the destructor declarator @p D with type @p 5177/// R. If there are any errors in the declarator, this routine will 5178/// emit diagnostics and set the declarator to invalid. Even if this happens, 5179/// will be updated to reflect a well-formed type for the destructor and 5180/// returned. 5181QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5182 StorageClass& SC) { 5183 // C++ [class.dtor]p1: 5184 // [...] A typedef-name that names a class is a class-name 5185 // (7.1.3); however, a typedef-name that names a class shall not 5186 // be used as the identifier in the declarator for a destructor 5187 // declaration. 5188 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5189 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5190 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5191 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5192 else if (const TemplateSpecializationType *TST = 5193 DeclaratorType->getAs<TemplateSpecializationType>()) 5194 if (TST->isTypeAlias()) 5195 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5196 << DeclaratorType << 1; 5197 5198 // C++ [class.dtor]p2: 5199 // A destructor is used to destroy objects of its class type. A 5200 // destructor takes no parameters, and no return type can be 5201 // specified for it (not even void). The address of a destructor 5202 // shall not be taken. A destructor shall not be static. A 5203 // destructor can be invoked for a const, volatile or const 5204 // volatile object. A destructor shall not be declared const, 5205 // volatile or const volatile (9.3.2). 5206 if (SC == SC_Static) { 5207 if (!D.isInvalidType()) 5208 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5209 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5210 << SourceRange(D.getIdentifierLoc()) 5211 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5212 5213 SC = SC_None; 5214 } 5215 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5216 // Destructors don't have return types, but the parser will 5217 // happily parse something like: 5218 // 5219 // class X { 5220 // float ~X(); 5221 // }; 5222 // 5223 // The return type will be eliminated later. 5224 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5225 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5226 << SourceRange(D.getIdentifierLoc()); 5227 } 5228 5229 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5230 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5231 if (FTI.TypeQuals & Qualifiers::Const) 5232 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5233 << "const" << SourceRange(D.getIdentifierLoc()); 5234 if (FTI.TypeQuals & Qualifiers::Volatile) 5235 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5236 << "volatile" << SourceRange(D.getIdentifierLoc()); 5237 if (FTI.TypeQuals & Qualifiers::Restrict) 5238 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5239 << "restrict" << SourceRange(D.getIdentifierLoc()); 5240 D.setInvalidType(); 5241 } 5242 5243 // C++0x [class.dtor]p2: 5244 // A destructor shall not be declared with a ref-qualifier. 5245 if (FTI.hasRefQualifier()) { 5246 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5247 << FTI.RefQualifierIsLValueRef 5248 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5249 D.setInvalidType(); 5250 } 5251 5252 // Make sure we don't have any parameters. 5253 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5254 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5255 5256 // Delete the parameters. 5257 FTI.freeArgs(); 5258 D.setInvalidType(); 5259 } 5260 5261 // Make sure the destructor isn't variadic. 5262 if (FTI.isVariadic) { 5263 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5264 D.setInvalidType(); 5265 } 5266 5267 // Rebuild the function type "R" without any type qualifiers or 5268 // parameters (in case any of the errors above fired) and with 5269 // "void" as the return type, since destructors don't have return 5270 // types. 5271 if (!D.isInvalidType()) 5272 return R; 5273 5274 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5275 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5276 EPI.Variadic = false; 5277 EPI.TypeQuals = 0; 5278 EPI.RefQualifier = RQ_None; 5279 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5280} 5281 5282/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5283/// well-formednes of the conversion function declarator @p D with 5284/// type @p R. If there are any errors in the declarator, this routine 5285/// will emit diagnostics and return true. Otherwise, it will return 5286/// false. Either way, the type @p R will be updated to reflect a 5287/// well-formed type for the conversion operator. 5288void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5289 StorageClass& SC) { 5290 // C++ [class.conv.fct]p1: 5291 // Neither parameter types nor return type can be specified. The 5292 // type of a conversion function (8.3.5) is "function taking no 5293 // parameter returning conversion-type-id." 5294 if (SC == SC_Static) { 5295 if (!D.isInvalidType()) 5296 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5297 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5298 << SourceRange(D.getIdentifierLoc()); 5299 D.setInvalidType(); 5300 SC = SC_None; 5301 } 5302 5303 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5304 5305 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5306 // Conversion functions don't have return types, but the parser will 5307 // happily parse something like: 5308 // 5309 // class X { 5310 // float operator bool(); 5311 // }; 5312 // 5313 // The return type will be changed later anyway. 5314 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5315 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5316 << SourceRange(D.getIdentifierLoc()); 5317 D.setInvalidType(); 5318 } 5319 5320 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5321 5322 // Make sure we don't have any parameters. 5323 if (Proto->getNumArgs() > 0) { 5324 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5325 5326 // Delete the parameters. 5327 D.getFunctionTypeInfo().freeArgs(); 5328 D.setInvalidType(); 5329 } else if (Proto->isVariadic()) { 5330 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5331 D.setInvalidType(); 5332 } 5333 5334 // Diagnose "&operator bool()" and other such nonsense. This 5335 // is actually a gcc extension which we don't support. 5336 if (Proto->getResultType() != ConvType) { 5337 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5338 << Proto->getResultType(); 5339 D.setInvalidType(); 5340 ConvType = Proto->getResultType(); 5341 } 5342 5343 // C++ [class.conv.fct]p4: 5344 // The conversion-type-id shall not represent a function type nor 5345 // an array type. 5346 if (ConvType->isArrayType()) { 5347 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5348 ConvType = Context.getPointerType(ConvType); 5349 D.setInvalidType(); 5350 } else if (ConvType->isFunctionType()) { 5351 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5352 ConvType = Context.getPointerType(ConvType); 5353 D.setInvalidType(); 5354 } 5355 5356 // Rebuild the function type "R" without any parameters (in case any 5357 // of the errors above fired) and with the conversion type as the 5358 // return type. 5359 if (D.isInvalidType()) 5360 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5361 5362 // C++0x explicit conversion operators. 5363 if (D.getDeclSpec().isExplicitSpecified()) 5364 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5365 getLangOpts().CPlusPlus0x ? 5366 diag::warn_cxx98_compat_explicit_conversion_functions : 5367 diag::ext_explicit_conversion_functions) 5368 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5369} 5370 5371/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5372/// the declaration of the given C++ conversion function. This routine 5373/// is responsible for recording the conversion function in the C++ 5374/// class, if possible. 5375Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5376 assert(Conversion && "Expected to receive a conversion function declaration"); 5377 5378 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5379 5380 // Make sure we aren't redeclaring the conversion function. 5381 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5382 5383 // C++ [class.conv.fct]p1: 5384 // [...] A conversion function is never used to convert a 5385 // (possibly cv-qualified) object to the (possibly cv-qualified) 5386 // same object type (or a reference to it), to a (possibly 5387 // cv-qualified) base class of that type (or a reference to it), 5388 // or to (possibly cv-qualified) void. 5389 // FIXME: Suppress this warning if the conversion function ends up being a 5390 // virtual function that overrides a virtual function in a base class. 5391 QualType ClassType 5392 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5393 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5394 ConvType = ConvTypeRef->getPointeeType(); 5395 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5396 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5397 /* Suppress diagnostics for instantiations. */; 5398 else if (ConvType->isRecordType()) { 5399 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5400 if (ConvType == ClassType) 5401 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5402 << ClassType; 5403 else if (IsDerivedFrom(ClassType, ConvType)) 5404 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5405 << ClassType << ConvType; 5406 } else if (ConvType->isVoidType()) { 5407 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5408 << ClassType << ConvType; 5409 } 5410 5411 if (FunctionTemplateDecl *ConversionTemplate 5412 = Conversion->getDescribedFunctionTemplate()) 5413 return ConversionTemplate; 5414 5415 return Conversion; 5416} 5417 5418//===----------------------------------------------------------------------===// 5419// Namespace Handling 5420//===----------------------------------------------------------------------===// 5421 5422 5423 5424/// ActOnStartNamespaceDef - This is called at the start of a namespace 5425/// definition. 5426Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5427 SourceLocation InlineLoc, 5428 SourceLocation NamespaceLoc, 5429 SourceLocation IdentLoc, 5430 IdentifierInfo *II, 5431 SourceLocation LBrace, 5432 AttributeList *AttrList) { 5433 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5434 // For anonymous namespace, take the location of the left brace. 5435 SourceLocation Loc = II ? IdentLoc : LBrace; 5436 bool IsInline = InlineLoc.isValid(); 5437 bool IsInvalid = false; 5438 bool IsStd = false; 5439 bool AddToKnown = false; 5440 Scope *DeclRegionScope = NamespcScope->getParent(); 5441 5442 NamespaceDecl *PrevNS = 0; 5443 if (II) { 5444 // C++ [namespace.def]p2: 5445 // The identifier in an original-namespace-definition shall not 5446 // have been previously defined in the declarative region in 5447 // which the original-namespace-definition appears. The 5448 // identifier in an original-namespace-definition is the name of 5449 // the namespace. Subsequently in that declarative region, it is 5450 // treated as an original-namespace-name. 5451 // 5452 // Since namespace names are unique in their scope, and we don't 5453 // look through using directives, just look for any ordinary names. 5454 5455 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5456 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5457 Decl::IDNS_Namespace; 5458 NamedDecl *PrevDecl = 0; 5459 for (DeclContext::lookup_result R 5460 = CurContext->getRedeclContext()->lookup(II); 5461 R.first != R.second; ++R.first) { 5462 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5463 PrevDecl = *R.first; 5464 break; 5465 } 5466 } 5467 5468 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5469 5470 if (PrevNS) { 5471 // This is an extended namespace definition. 5472 if (IsInline != PrevNS->isInline()) { 5473 // inline-ness must match 5474 if (PrevNS->isInline()) { 5475 // The user probably just forgot the 'inline', so suggest that it 5476 // be added back. 5477 Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5478 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5479 } else { 5480 Diag(Loc, diag::err_inline_namespace_mismatch) 5481 << IsInline; 5482 } 5483 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5484 5485 IsInline = PrevNS->isInline(); 5486 } 5487 } else if (PrevDecl) { 5488 // This is an invalid name redefinition. 5489 Diag(Loc, diag::err_redefinition_different_kind) 5490 << II; 5491 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5492 IsInvalid = true; 5493 // Continue on to push Namespc as current DeclContext and return it. 5494 } else if (II->isStr("std") && 5495 CurContext->getRedeclContext()->isTranslationUnit()) { 5496 // This is the first "real" definition of the namespace "std", so update 5497 // our cache of the "std" namespace to point at this definition. 5498 PrevNS = getStdNamespace(); 5499 IsStd = true; 5500 AddToKnown = !IsInline; 5501 } else { 5502 // We've seen this namespace for the first time. 5503 AddToKnown = !IsInline; 5504 } 5505 } else { 5506 // Anonymous namespaces. 5507 5508 // Determine whether the parent already has an anonymous namespace. 5509 DeclContext *Parent = CurContext->getRedeclContext(); 5510 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5511 PrevNS = TU->getAnonymousNamespace(); 5512 } else { 5513 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5514 PrevNS = ND->getAnonymousNamespace(); 5515 } 5516 5517 if (PrevNS && IsInline != PrevNS->isInline()) { 5518 // inline-ness must match 5519 Diag(Loc, diag::err_inline_namespace_mismatch) 5520 << IsInline; 5521 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5522 5523 // Recover by ignoring the new namespace's inline status. 5524 IsInline = PrevNS->isInline(); 5525 } 5526 } 5527 5528 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5529 StartLoc, Loc, II, PrevNS); 5530 if (IsInvalid) 5531 Namespc->setInvalidDecl(); 5532 5533 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5534 5535 // FIXME: Should we be merging attributes? 5536 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5537 PushNamespaceVisibilityAttr(Attr, Loc); 5538 5539 if (IsStd) 5540 StdNamespace = Namespc; 5541 if (AddToKnown) 5542 KnownNamespaces[Namespc] = false; 5543 5544 if (II) { 5545 PushOnScopeChains(Namespc, DeclRegionScope); 5546 } else { 5547 // Link the anonymous namespace into its parent. 5548 DeclContext *Parent = CurContext->getRedeclContext(); 5549 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5550 TU->setAnonymousNamespace(Namespc); 5551 } else { 5552 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5553 } 5554 5555 CurContext->addDecl(Namespc); 5556 5557 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5558 // behaves as if it were replaced by 5559 // namespace unique { /* empty body */ } 5560 // using namespace unique; 5561 // namespace unique { namespace-body } 5562 // where all occurrences of 'unique' in a translation unit are 5563 // replaced by the same identifier and this identifier differs 5564 // from all other identifiers in the entire program. 5565 5566 // We just create the namespace with an empty name and then add an 5567 // implicit using declaration, just like the standard suggests. 5568 // 5569 // CodeGen enforces the "universally unique" aspect by giving all 5570 // declarations semantically contained within an anonymous 5571 // namespace internal linkage. 5572 5573 if (!PrevNS) { 5574 UsingDirectiveDecl* UD 5575 = UsingDirectiveDecl::Create(Context, CurContext, 5576 /* 'using' */ LBrace, 5577 /* 'namespace' */ SourceLocation(), 5578 /* qualifier */ NestedNameSpecifierLoc(), 5579 /* identifier */ SourceLocation(), 5580 Namespc, 5581 /* Ancestor */ CurContext); 5582 UD->setImplicit(); 5583 CurContext->addDecl(UD); 5584 } 5585 } 5586 5587 // Although we could have an invalid decl (i.e. the namespace name is a 5588 // redefinition), push it as current DeclContext and try to continue parsing. 5589 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5590 // for the namespace has the declarations that showed up in that particular 5591 // namespace definition. 5592 PushDeclContext(NamespcScope, Namespc); 5593 return Namespc; 5594} 5595 5596/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5597/// is a namespace alias, returns the namespace it points to. 5598static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5599 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5600 return AD->getNamespace(); 5601 return dyn_cast_or_null<NamespaceDecl>(D); 5602} 5603 5604/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5605/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5606void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5607 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5608 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5609 Namespc->setRBraceLoc(RBrace); 5610 PopDeclContext(); 5611 if (Namespc->hasAttr<VisibilityAttr>()) 5612 PopPragmaVisibility(true, RBrace); 5613} 5614 5615CXXRecordDecl *Sema::getStdBadAlloc() const { 5616 return cast_or_null<CXXRecordDecl>( 5617 StdBadAlloc.get(Context.getExternalSource())); 5618} 5619 5620NamespaceDecl *Sema::getStdNamespace() const { 5621 return cast_or_null<NamespaceDecl>( 5622 StdNamespace.get(Context.getExternalSource())); 5623} 5624 5625/// \brief Retrieve the special "std" namespace, which may require us to 5626/// implicitly define the namespace. 5627NamespaceDecl *Sema::getOrCreateStdNamespace() { 5628 if (!StdNamespace) { 5629 // The "std" namespace has not yet been defined, so build one implicitly. 5630 StdNamespace = NamespaceDecl::Create(Context, 5631 Context.getTranslationUnitDecl(), 5632 /*Inline=*/false, 5633 SourceLocation(), SourceLocation(), 5634 &PP.getIdentifierTable().get("std"), 5635 /*PrevDecl=*/0); 5636 getStdNamespace()->setImplicit(true); 5637 } 5638 5639 return getStdNamespace(); 5640} 5641 5642bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 5643 assert(getLangOpts().CPlusPlus && 5644 "Looking for std::initializer_list outside of C++."); 5645 5646 // We're looking for implicit instantiations of 5647 // template <typename E> class std::initializer_list. 5648 5649 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 5650 return false; 5651 5652 ClassTemplateDecl *Template = 0; 5653 const TemplateArgument *Arguments = 0; 5654 5655 if (const RecordType *RT = Ty->getAs<RecordType>()) { 5656 5657 ClassTemplateSpecializationDecl *Specialization = 5658 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 5659 if (!Specialization) 5660 return false; 5661 5662 Template = Specialization->getSpecializedTemplate(); 5663 Arguments = Specialization->getTemplateArgs().data(); 5664 } else if (const TemplateSpecializationType *TST = 5665 Ty->getAs<TemplateSpecializationType>()) { 5666 Template = dyn_cast_or_null<ClassTemplateDecl>( 5667 TST->getTemplateName().getAsTemplateDecl()); 5668 Arguments = TST->getArgs(); 5669 } 5670 if (!Template) 5671 return false; 5672 5673 if (!StdInitializerList) { 5674 // Haven't recognized std::initializer_list yet, maybe this is it. 5675 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 5676 if (TemplateClass->getIdentifier() != 5677 &PP.getIdentifierTable().get("initializer_list") || 5678 !getStdNamespace()->InEnclosingNamespaceSetOf( 5679 TemplateClass->getDeclContext())) 5680 return false; 5681 // This is a template called std::initializer_list, but is it the right 5682 // template? 5683 TemplateParameterList *Params = Template->getTemplateParameters(); 5684 if (Params->getMinRequiredArguments() != 1) 5685 return false; 5686 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 5687 return false; 5688 5689 // It's the right template. 5690 StdInitializerList = Template; 5691 } 5692 5693 if (Template != StdInitializerList) 5694 return false; 5695 5696 // This is an instance of std::initializer_list. Find the argument type. 5697 if (Element) 5698 *Element = Arguments[0].getAsType(); 5699 return true; 5700} 5701 5702static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 5703 NamespaceDecl *Std = S.getStdNamespace(); 5704 if (!Std) { 5705 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5706 return 0; 5707 } 5708 5709 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 5710 Loc, Sema::LookupOrdinaryName); 5711 if (!S.LookupQualifiedName(Result, Std)) { 5712 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5713 return 0; 5714 } 5715 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 5716 if (!Template) { 5717 Result.suppressDiagnostics(); 5718 // We found something weird. Complain about the first thing we found. 5719 NamedDecl *Found = *Result.begin(); 5720 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 5721 return 0; 5722 } 5723 5724 // We found some template called std::initializer_list. Now verify that it's 5725 // correct. 5726 TemplateParameterList *Params = Template->getTemplateParameters(); 5727 if (Params->getMinRequiredArguments() != 1 || 5728 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 5729 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 5730 return 0; 5731 } 5732 5733 return Template; 5734} 5735 5736QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 5737 if (!StdInitializerList) { 5738 StdInitializerList = LookupStdInitializerList(*this, Loc); 5739 if (!StdInitializerList) 5740 return QualType(); 5741 } 5742 5743 TemplateArgumentListInfo Args(Loc, Loc); 5744 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 5745 Context.getTrivialTypeSourceInfo(Element, 5746 Loc))); 5747 return Context.getCanonicalType( 5748 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 5749} 5750 5751bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 5752 // C++ [dcl.init.list]p2: 5753 // A constructor is an initializer-list constructor if its first parameter 5754 // is of type std::initializer_list<E> or reference to possibly cv-qualified 5755 // std::initializer_list<E> for some type E, and either there are no other 5756 // parameters or else all other parameters have default arguments. 5757 if (Ctor->getNumParams() < 1 || 5758 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 5759 return false; 5760 5761 QualType ArgType = Ctor->getParamDecl(0)->getType(); 5762 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 5763 ArgType = RT->getPointeeType().getUnqualifiedType(); 5764 5765 return isStdInitializerList(ArgType, 0); 5766} 5767 5768/// \brief Determine whether a using statement is in a context where it will be 5769/// apply in all contexts. 5770static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5771 switch (CurContext->getDeclKind()) { 5772 case Decl::TranslationUnit: 5773 return true; 5774 case Decl::LinkageSpec: 5775 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5776 default: 5777 return false; 5778 } 5779} 5780 5781namespace { 5782 5783// Callback to only accept typo corrections that are namespaces. 5784class NamespaceValidatorCCC : public CorrectionCandidateCallback { 5785 public: 5786 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5787 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 5788 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 5789 } 5790 return false; 5791 } 5792}; 5793 5794} 5795 5796static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5797 CXXScopeSpec &SS, 5798 SourceLocation IdentLoc, 5799 IdentifierInfo *Ident) { 5800 NamespaceValidatorCCC Validator; 5801 R.clear(); 5802 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5803 R.getLookupKind(), Sc, &SS, 5804 Validator)) { 5805 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 5806 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOpts())); 5807 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5808 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5809 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5810 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5811 else 5812 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5813 << Ident << CorrectedQuotedStr 5814 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5815 5816 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5817 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5818 5819 R.addDecl(Corrected.getCorrectionDecl()); 5820 return true; 5821 } 5822 return false; 5823} 5824 5825Decl *Sema::ActOnUsingDirective(Scope *S, 5826 SourceLocation UsingLoc, 5827 SourceLocation NamespcLoc, 5828 CXXScopeSpec &SS, 5829 SourceLocation IdentLoc, 5830 IdentifierInfo *NamespcName, 5831 AttributeList *AttrList) { 5832 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5833 assert(NamespcName && "Invalid NamespcName."); 5834 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5835 5836 // This can only happen along a recovery path. 5837 while (S->getFlags() & Scope::TemplateParamScope) 5838 S = S->getParent(); 5839 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5840 5841 UsingDirectiveDecl *UDir = 0; 5842 NestedNameSpecifier *Qualifier = 0; 5843 if (SS.isSet()) 5844 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5845 5846 // Lookup namespace name. 5847 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5848 LookupParsedName(R, S, &SS); 5849 if (R.isAmbiguous()) 5850 return 0; 5851 5852 if (R.empty()) { 5853 R.clear(); 5854 // Allow "using namespace std;" or "using namespace ::std;" even if 5855 // "std" hasn't been defined yet, for GCC compatibility. 5856 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5857 NamespcName->isStr("std")) { 5858 Diag(IdentLoc, diag::ext_using_undefined_std); 5859 R.addDecl(getOrCreateStdNamespace()); 5860 R.resolveKind(); 5861 } 5862 // Otherwise, attempt typo correction. 5863 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5864 } 5865 5866 if (!R.empty()) { 5867 NamedDecl *Named = R.getFoundDecl(); 5868 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5869 && "expected namespace decl"); 5870 // C++ [namespace.udir]p1: 5871 // A using-directive specifies that the names in the nominated 5872 // namespace can be used in the scope in which the 5873 // using-directive appears after the using-directive. During 5874 // unqualified name lookup (3.4.1), the names appear as if they 5875 // were declared in the nearest enclosing namespace which 5876 // contains both the using-directive and the nominated 5877 // namespace. [Note: in this context, "contains" means "contains 5878 // directly or indirectly". ] 5879 5880 // Find enclosing context containing both using-directive and 5881 // nominated namespace. 5882 NamespaceDecl *NS = getNamespaceDecl(Named); 5883 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5884 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5885 CommonAncestor = CommonAncestor->getParent(); 5886 5887 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5888 SS.getWithLocInContext(Context), 5889 IdentLoc, Named, CommonAncestor); 5890 5891 if (IsUsingDirectiveInToplevelContext(CurContext) && 5892 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5893 Diag(IdentLoc, diag::warn_using_directive_in_header); 5894 } 5895 5896 PushUsingDirective(S, UDir); 5897 } else { 5898 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5899 } 5900 5901 // FIXME: We ignore attributes for now. 5902 return UDir; 5903} 5904 5905void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5906 // If the scope has an associated entity and the using directive is at 5907 // namespace or translation unit scope, add the UsingDirectiveDecl into 5908 // its lookup structure so qualified name lookup can find it. 5909 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()); 5910 if (Ctx && !Ctx->isFunctionOrMethod()) 5911 Ctx->addDecl(UDir); 5912 else 5913 // Otherwise, it is at block sope. The using-directives will affect lookup 5914 // only to the end of the scope. 5915 S->PushUsingDirective(UDir); 5916} 5917 5918 5919Decl *Sema::ActOnUsingDeclaration(Scope *S, 5920 AccessSpecifier AS, 5921 bool HasUsingKeyword, 5922 SourceLocation UsingLoc, 5923 CXXScopeSpec &SS, 5924 UnqualifiedId &Name, 5925 AttributeList *AttrList, 5926 bool IsTypeName, 5927 SourceLocation TypenameLoc) { 5928 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5929 5930 switch (Name.getKind()) { 5931 case UnqualifiedId::IK_ImplicitSelfParam: 5932 case UnqualifiedId::IK_Identifier: 5933 case UnqualifiedId::IK_OperatorFunctionId: 5934 case UnqualifiedId::IK_LiteralOperatorId: 5935 case UnqualifiedId::IK_ConversionFunctionId: 5936 break; 5937 5938 case UnqualifiedId::IK_ConstructorName: 5939 case UnqualifiedId::IK_ConstructorTemplateId: 5940 // C++11 inheriting constructors. 5941 Diag(Name.getLocStart(), 5942 getLangOpts().CPlusPlus0x ? 5943 // FIXME: Produce warn_cxx98_compat_using_decl_constructor 5944 // instead once inheriting constructors work. 5945 diag::err_using_decl_constructor_unsupported : 5946 diag::err_using_decl_constructor) 5947 << SS.getRange(); 5948 5949 if (getLangOpts().CPlusPlus0x) break; 5950 5951 return 0; 5952 5953 case UnqualifiedId::IK_DestructorName: 5954 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 5955 << SS.getRange(); 5956 return 0; 5957 5958 case UnqualifiedId::IK_TemplateId: 5959 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 5960 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5961 return 0; 5962 } 5963 5964 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5965 DeclarationName TargetName = TargetNameInfo.getName(); 5966 if (!TargetName) 5967 return 0; 5968 5969 // Warn about using declarations. 5970 // TODO: store that the declaration was written without 'using' and 5971 // talk about access decls instead of using decls in the 5972 // diagnostics. 5973 if (!HasUsingKeyword) { 5974 UsingLoc = Name.getLocStart(); 5975 5976 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5977 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5978 } 5979 5980 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5981 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5982 return 0; 5983 5984 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5985 TargetNameInfo, AttrList, 5986 /* IsInstantiation */ false, 5987 IsTypeName, TypenameLoc); 5988 if (UD) 5989 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5990 5991 return UD; 5992} 5993 5994/// \brief Determine whether a using declaration considers the given 5995/// declarations as "equivalent", e.g., if they are redeclarations of 5996/// the same entity or are both typedefs of the same type. 5997static bool 5998IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5999 bool &SuppressRedeclaration) { 6000 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 6001 SuppressRedeclaration = false; 6002 return true; 6003 } 6004 6005 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 6006 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 6007 SuppressRedeclaration = true; 6008 return Context.hasSameType(TD1->getUnderlyingType(), 6009 TD2->getUnderlyingType()); 6010 } 6011 6012 return false; 6013} 6014 6015 6016/// Determines whether to create a using shadow decl for a particular 6017/// decl, given the set of decls existing prior to this using lookup. 6018bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 6019 const LookupResult &Previous) { 6020 // Diagnose finding a decl which is not from a base class of the 6021 // current class. We do this now because there are cases where this 6022 // function will silently decide not to build a shadow decl, which 6023 // will pre-empt further diagnostics. 6024 // 6025 // We don't need to do this in C++0x because we do the check once on 6026 // the qualifier. 6027 // 6028 // FIXME: diagnose the following if we care enough: 6029 // struct A { int foo; }; 6030 // struct B : A { using A::foo; }; 6031 // template <class T> struct C : A {}; 6032 // template <class T> struct D : C<T> { using B::foo; } // <--- 6033 // This is invalid (during instantiation) in C++03 because B::foo 6034 // resolves to the using decl in B, which is not a base class of D<T>. 6035 // We can't diagnose it immediately because C<T> is an unknown 6036 // specialization. The UsingShadowDecl in D<T> then points directly 6037 // to A::foo, which will look well-formed when we instantiate. 6038 // The right solution is to not collapse the shadow-decl chain. 6039 if (!getLangOpts().CPlusPlus0x && CurContext->isRecord()) { 6040 DeclContext *OrigDC = Orig->getDeclContext(); 6041 6042 // Handle enums and anonymous structs. 6043 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 6044 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 6045 while (OrigRec->isAnonymousStructOrUnion()) 6046 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 6047 6048 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 6049 if (OrigDC == CurContext) { 6050 Diag(Using->getLocation(), 6051 diag::err_using_decl_nested_name_specifier_is_current_class) 6052 << Using->getQualifierLoc().getSourceRange(); 6053 Diag(Orig->getLocation(), diag::note_using_decl_target); 6054 return true; 6055 } 6056 6057 Diag(Using->getQualifierLoc().getBeginLoc(), 6058 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6059 << Using->getQualifier() 6060 << cast<CXXRecordDecl>(CurContext) 6061 << Using->getQualifierLoc().getSourceRange(); 6062 Diag(Orig->getLocation(), diag::note_using_decl_target); 6063 return true; 6064 } 6065 } 6066 6067 if (Previous.empty()) return false; 6068 6069 NamedDecl *Target = Orig; 6070 if (isa<UsingShadowDecl>(Target)) 6071 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6072 6073 // If the target happens to be one of the previous declarations, we 6074 // don't have a conflict. 6075 // 6076 // FIXME: but we might be increasing its access, in which case we 6077 // should redeclare it. 6078 NamedDecl *NonTag = 0, *Tag = 0; 6079 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 6080 I != E; ++I) { 6081 NamedDecl *D = (*I)->getUnderlyingDecl(); 6082 bool Result; 6083 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 6084 return Result; 6085 6086 (isa<TagDecl>(D) ? Tag : NonTag) = D; 6087 } 6088 6089 if (Target->isFunctionOrFunctionTemplate()) { 6090 FunctionDecl *FD; 6091 if (isa<FunctionTemplateDecl>(Target)) 6092 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6093 else 6094 FD = cast<FunctionDecl>(Target); 6095 6096 NamedDecl *OldDecl = 0; 6097 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6098 case Ovl_Overload: 6099 return false; 6100 6101 case Ovl_NonFunction: 6102 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6103 break; 6104 6105 // We found a decl with the exact signature. 6106 case Ovl_Match: 6107 // If we're in a record, we want to hide the target, so we 6108 // return true (without a diagnostic) to tell the caller not to 6109 // build a shadow decl. 6110 if (CurContext->isRecord()) 6111 return true; 6112 6113 // If we're not in a record, this is an error. 6114 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6115 break; 6116 } 6117 6118 Diag(Target->getLocation(), diag::note_using_decl_target); 6119 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6120 return true; 6121 } 6122 6123 // Target is not a function. 6124 6125 if (isa<TagDecl>(Target)) { 6126 // No conflict between a tag and a non-tag. 6127 if (!Tag) return false; 6128 6129 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6130 Diag(Target->getLocation(), diag::note_using_decl_target); 6131 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6132 return true; 6133 } 6134 6135 // No conflict between a tag and a non-tag. 6136 if (!NonTag) return false; 6137 6138 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6139 Diag(Target->getLocation(), diag::note_using_decl_target); 6140 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6141 return true; 6142} 6143 6144/// Builds a shadow declaration corresponding to a 'using' declaration. 6145UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6146 UsingDecl *UD, 6147 NamedDecl *Orig) { 6148 6149 // If we resolved to another shadow declaration, just coalesce them. 6150 NamedDecl *Target = Orig; 6151 if (isa<UsingShadowDecl>(Target)) { 6152 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6153 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6154 } 6155 6156 UsingShadowDecl *Shadow 6157 = UsingShadowDecl::Create(Context, CurContext, 6158 UD->getLocation(), UD, Target); 6159 UD->addShadowDecl(Shadow); 6160 6161 Shadow->setAccess(UD->getAccess()); 6162 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6163 Shadow->setInvalidDecl(); 6164 6165 if (S) 6166 PushOnScopeChains(Shadow, S); 6167 else 6168 CurContext->addDecl(Shadow); 6169 6170 6171 return Shadow; 6172} 6173 6174/// Hides a using shadow declaration. This is required by the current 6175/// using-decl implementation when a resolvable using declaration in a 6176/// class is followed by a declaration which would hide or override 6177/// one or more of the using decl's targets; for example: 6178/// 6179/// struct Base { void foo(int); }; 6180/// struct Derived : Base { 6181/// using Base::foo; 6182/// void foo(int); 6183/// }; 6184/// 6185/// The governing language is C++03 [namespace.udecl]p12: 6186/// 6187/// When a using-declaration brings names from a base class into a 6188/// derived class scope, member functions in the derived class 6189/// override and/or hide member functions with the same name and 6190/// parameter types in a base class (rather than conflicting). 6191/// 6192/// There are two ways to implement this: 6193/// (1) optimistically create shadow decls when they're not hidden 6194/// by existing declarations, or 6195/// (2) don't create any shadow decls (or at least don't make them 6196/// visible) until we've fully parsed/instantiated the class. 6197/// The problem with (1) is that we might have to retroactively remove 6198/// a shadow decl, which requires several O(n) operations because the 6199/// decl structures are (very reasonably) not designed for removal. 6200/// (2) avoids this but is very fiddly and phase-dependent. 6201void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6202 if (Shadow->getDeclName().getNameKind() == 6203 DeclarationName::CXXConversionFunctionName) 6204 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6205 6206 // Remove it from the DeclContext... 6207 Shadow->getDeclContext()->removeDecl(Shadow); 6208 6209 // ...and the scope, if applicable... 6210 if (S) { 6211 S->RemoveDecl(Shadow); 6212 IdResolver.RemoveDecl(Shadow); 6213 } 6214 6215 // ...and the using decl. 6216 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6217 6218 // TODO: complain somehow if Shadow was used. It shouldn't 6219 // be possible for this to happen, because...? 6220} 6221 6222/// Builds a using declaration. 6223/// 6224/// \param IsInstantiation - Whether this call arises from an 6225/// instantiation of an unresolved using declaration. We treat 6226/// the lookup differently for these declarations. 6227NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6228 SourceLocation UsingLoc, 6229 CXXScopeSpec &SS, 6230 const DeclarationNameInfo &NameInfo, 6231 AttributeList *AttrList, 6232 bool IsInstantiation, 6233 bool IsTypeName, 6234 SourceLocation TypenameLoc) { 6235 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6236 SourceLocation IdentLoc = NameInfo.getLoc(); 6237 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6238 6239 // FIXME: We ignore attributes for now. 6240 6241 if (SS.isEmpty()) { 6242 Diag(IdentLoc, diag::err_using_requires_qualname); 6243 return 0; 6244 } 6245 6246 // Do the redeclaration lookup in the current scope. 6247 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6248 ForRedeclaration); 6249 Previous.setHideTags(false); 6250 if (S) { 6251 LookupName(Previous, S); 6252 6253 // It is really dumb that we have to do this. 6254 LookupResult::Filter F = Previous.makeFilter(); 6255 while (F.hasNext()) { 6256 NamedDecl *D = F.next(); 6257 if (!isDeclInScope(D, CurContext, S)) 6258 F.erase(); 6259 } 6260 F.done(); 6261 } else { 6262 assert(IsInstantiation && "no scope in non-instantiation"); 6263 assert(CurContext->isRecord() && "scope not record in instantiation"); 6264 LookupQualifiedName(Previous, CurContext); 6265 } 6266 6267 // Check for invalid redeclarations. 6268 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6269 return 0; 6270 6271 // Check for bad qualifiers. 6272 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6273 return 0; 6274 6275 DeclContext *LookupContext = computeDeclContext(SS); 6276 NamedDecl *D; 6277 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6278 if (!LookupContext) { 6279 if (IsTypeName) { 6280 // FIXME: not all declaration name kinds are legal here 6281 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6282 UsingLoc, TypenameLoc, 6283 QualifierLoc, 6284 IdentLoc, NameInfo.getName()); 6285 } else { 6286 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6287 QualifierLoc, NameInfo); 6288 } 6289 } else { 6290 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6291 NameInfo, IsTypeName); 6292 } 6293 D->setAccess(AS); 6294 CurContext->addDecl(D); 6295 6296 if (!LookupContext) return D; 6297 UsingDecl *UD = cast<UsingDecl>(D); 6298 6299 if (RequireCompleteDeclContext(SS, LookupContext)) { 6300 UD->setInvalidDecl(); 6301 return UD; 6302 } 6303 6304 // The normal rules do not apply to inheriting constructor declarations. 6305 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6306 if (CheckInheritingConstructorUsingDecl(UD)) 6307 UD->setInvalidDecl(); 6308 return UD; 6309 } 6310 6311 // Otherwise, look up the target name. 6312 6313 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6314 6315 // Unlike most lookups, we don't always want to hide tag 6316 // declarations: tag names are visible through the using declaration 6317 // even if hidden by ordinary names, *except* in a dependent context 6318 // where it's important for the sanity of two-phase lookup. 6319 if (!IsInstantiation) 6320 R.setHideTags(false); 6321 6322 // For the purposes of this lookup, we have a base object type 6323 // equal to that of the current context. 6324 if (CurContext->isRecord()) { 6325 R.setBaseObjectType( 6326 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); 6327 } 6328 6329 LookupQualifiedName(R, LookupContext); 6330 6331 if (R.empty()) { 6332 Diag(IdentLoc, diag::err_no_member) 6333 << NameInfo.getName() << LookupContext << SS.getRange(); 6334 UD->setInvalidDecl(); 6335 return UD; 6336 } 6337 6338 if (R.isAmbiguous()) { 6339 UD->setInvalidDecl(); 6340 return UD; 6341 } 6342 6343 if (IsTypeName) { 6344 // If we asked for a typename and got a non-type decl, error out. 6345 if (!R.getAsSingle<TypeDecl>()) { 6346 Diag(IdentLoc, diag::err_using_typename_non_type); 6347 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6348 Diag((*I)->getUnderlyingDecl()->getLocation(), 6349 diag::note_using_decl_target); 6350 UD->setInvalidDecl(); 6351 return UD; 6352 } 6353 } else { 6354 // If we asked for a non-typename and we got a type, error out, 6355 // but only if this is an instantiation of an unresolved using 6356 // decl. Otherwise just silently find the type name. 6357 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6358 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6359 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6360 UD->setInvalidDecl(); 6361 return UD; 6362 } 6363 } 6364 6365 // C++0x N2914 [namespace.udecl]p6: 6366 // A using-declaration shall not name a namespace. 6367 if (R.getAsSingle<NamespaceDecl>()) { 6368 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6369 << SS.getRange(); 6370 UD->setInvalidDecl(); 6371 return UD; 6372 } 6373 6374 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6375 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6376 BuildUsingShadowDecl(S, UD, *I); 6377 } 6378 6379 return UD; 6380} 6381 6382/// Additional checks for a using declaration referring to a constructor name. 6383bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { 6384 assert(!UD->isTypeName() && "expecting a constructor name"); 6385 6386 const Type *SourceType = UD->getQualifier()->getAsType(); 6387 assert(SourceType && 6388 "Using decl naming constructor doesn't have type in scope spec."); 6389 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6390 6391 // Check whether the named type is a direct base class. 6392 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6393 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6394 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6395 BaseIt != BaseE; ++BaseIt) { 6396 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6397 if (CanonicalSourceType == BaseType) 6398 break; 6399 if (BaseIt->getType()->isDependentType()) 6400 break; 6401 } 6402 6403 if (BaseIt == BaseE) { 6404 // Did not find SourceType in the bases. 6405 Diag(UD->getUsingLocation(), 6406 diag::err_using_decl_constructor_not_in_direct_base) 6407 << UD->getNameInfo().getSourceRange() 6408 << QualType(SourceType, 0) << TargetClass; 6409 return true; 6410 } 6411 6412 if (!CurContext->isDependentContext()) 6413 BaseIt->setInheritConstructors(); 6414 6415 return false; 6416} 6417 6418/// Checks that the given using declaration is not an invalid 6419/// redeclaration. Note that this is checking only for the using decl 6420/// itself, not for any ill-formedness among the UsingShadowDecls. 6421bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6422 bool isTypeName, 6423 const CXXScopeSpec &SS, 6424 SourceLocation NameLoc, 6425 const LookupResult &Prev) { 6426 // C++03 [namespace.udecl]p8: 6427 // C++0x [namespace.udecl]p10: 6428 // A using-declaration is a declaration and can therefore be used 6429 // repeatedly where (and only where) multiple declarations are 6430 // allowed. 6431 // 6432 // That's in non-member contexts. 6433 if (!CurContext->getRedeclContext()->isRecord()) 6434 return false; 6435 6436 NestedNameSpecifier *Qual 6437 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6438 6439 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6440 NamedDecl *D = *I; 6441 6442 bool DTypename; 6443 NestedNameSpecifier *DQual; 6444 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6445 DTypename = UD->isTypeName(); 6446 DQual = UD->getQualifier(); 6447 } else if (UnresolvedUsingValueDecl *UD 6448 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6449 DTypename = false; 6450 DQual = UD->getQualifier(); 6451 } else if (UnresolvedUsingTypenameDecl *UD 6452 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6453 DTypename = true; 6454 DQual = UD->getQualifier(); 6455 } else continue; 6456 6457 // using decls differ if one says 'typename' and the other doesn't. 6458 // FIXME: non-dependent using decls? 6459 if (isTypeName != DTypename) continue; 6460 6461 // using decls differ if they name different scopes (but note that 6462 // template instantiation can cause this check to trigger when it 6463 // didn't before instantiation). 6464 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6465 Context.getCanonicalNestedNameSpecifier(DQual)) 6466 continue; 6467 6468 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6469 Diag(D->getLocation(), diag::note_using_decl) << 1; 6470 return true; 6471 } 6472 6473 return false; 6474} 6475 6476 6477/// Checks that the given nested-name qualifier used in a using decl 6478/// in the current context is appropriately related to the current 6479/// scope. If an error is found, diagnoses it and returns true. 6480bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6481 const CXXScopeSpec &SS, 6482 SourceLocation NameLoc) { 6483 DeclContext *NamedContext = computeDeclContext(SS); 6484 6485 if (!CurContext->isRecord()) { 6486 // C++03 [namespace.udecl]p3: 6487 // C++0x [namespace.udecl]p8: 6488 // A using-declaration for a class member shall be a member-declaration. 6489 6490 // If we weren't able to compute a valid scope, it must be a 6491 // dependent class scope. 6492 if (!NamedContext || NamedContext->isRecord()) { 6493 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6494 << SS.getRange(); 6495 return true; 6496 } 6497 6498 // Otherwise, everything is known to be fine. 6499 return false; 6500 } 6501 6502 // The current scope is a record. 6503 6504 // If the named context is dependent, we can't decide much. 6505 if (!NamedContext) { 6506 // FIXME: in C++0x, we can diagnose if we can prove that the 6507 // nested-name-specifier does not refer to a base class, which is 6508 // still possible in some cases. 6509 6510 // Otherwise we have to conservatively report that things might be 6511 // okay. 6512 return false; 6513 } 6514 6515 if (!NamedContext->isRecord()) { 6516 // Ideally this would point at the last name in the specifier, 6517 // but we don't have that level of source info. 6518 Diag(SS.getRange().getBegin(), 6519 diag::err_using_decl_nested_name_specifier_is_not_class) 6520 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6521 return true; 6522 } 6523 6524 if (!NamedContext->isDependentContext() && 6525 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6526 return true; 6527 6528 if (getLangOpts().CPlusPlus0x) { 6529 // C++0x [namespace.udecl]p3: 6530 // In a using-declaration used as a member-declaration, the 6531 // nested-name-specifier shall name a base class of the class 6532 // being defined. 6533 6534 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6535 cast<CXXRecordDecl>(NamedContext))) { 6536 if (CurContext == NamedContext) { 6537 Diag(NameLoc, 6538 diag::err_using_decl_nested_name_specifier_is_current_class) 6539 << SS.getRange(); 6540 return true; 6541 } 6542 6543 Diag(SS.getRange().getBegin(), 6544 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6545 << (NestedNameSpecifier*) SS.getScopeRep() 6546 << cast<CXXRecordDecl>(CurContext) 6547 << SS.getRange(); 6548 return true; 6549 } 6550 6551 return false; 6552 } 6553 6554 // C++03 [namespace.udecl]p4: 6555 // A using-declaration used as a member-declaration shall refer 6556 // to a member of a base class of the class being defined [etc.]. 6557 6558 // Salient point: SS doesn't have to name a base class as long as 6559 // lookup only finds members from base classes. Therefore we can 6560 // diagnose here only if we can prove that that can't happen, 6561 // i.e. if the class hierarchies provably don't intersect. 6562 6563 // TODO: it would be nice if "definitely valid" results were cached 6564 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6565 // need to be repeated. 6566 6567 struct UserData { 6568 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 6569 6570 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6571 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6572 Data->Bases.insert(Base); 6573 return true; 6574 } 6575 6576 bool hasDependentBases(const CXXRecordDecl *Class) { 6577 return !Class->forallBases(collect, this); 6578 } 6579 6580 /// Returns true if the base is dependent or is one of the 6581 /// accumulated base classes. 6582 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6583 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6584 return !Data->Bases.count(Base); 6585 } 6586 6587 bool mightShareBases(const CXXRecordDecl *Class) { 6588 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6589 } 6590 }; 6591 6592 UserData Data; 6593 6594 // Returns false if we find a dependent base. 6595 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6596 return false; 6597 6598 // Returns false if the class has a dependent base or if it or one 6599 // of its bases is present in the base set of the current context. 6600 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6601 return false; 6602 6603 Diag(SS.getRange().getBegin(), 6604 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6605 << (NestedNameSpecifier*) SS.getScopeRep() 6606 << cast<CXXRecordDecl>(CurContext) 6607 << SS.getRange(); 6608 6609 return true; 6610} 6611 6612Decl *Sema::ActOnAliasDeclaration(Scope *S, 6613 AccessSpecifier AS, 6614 MultiTemplateParamsArg TemplateParamLists, 6615 SourceLocation UsingLoc, 6616 UnqualifiedId &Name, 6617 TypeResult Type) { 6618 // Skip up to the relevant declaration scope. 6619 while (S->getFlags() & Scope::TemplateParamScope) 6620 S = S->getParent(); 6621 assert((S->getFlags() & Scope::DeclScope) && 6622 "got alias-declaration outside of declaration scope"); 6623 6624 if (Type.isInvalid()) 6625 return 0; 6626 6627 bool Invalid = false; 6628 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6629 TypeSourceInfo *TInfo = 0; 6630 GetTypeFromParser(Type.get(), &TInfo); 6631 6632 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6633 return 0; 6634 6635 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6636 UPPC_DeclarationType)) { 6637 Invalid = true; 6638 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6639 TInfo->getTypeLoc().getBeginLoc()); 6640 } 6641 6642 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6643 LookupName(Previous, S); 6644 6645 // Warn about shadowing the name of a template parameter. 6646 if (Previous.isSingleResult() && 6647 Previous.getFoundDecl()->isTemplateParameter()) { 6648 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6649 Previous.clear(); 6650 } 6651 6652 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6653 "name in alias declaration must be an identifier"); 6654 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6655 Name.StartLocation, 6656 Name.Identifier, TInfo); 6657 6658 NewTD->setAccess(AS); 6659 6660 if (Invalid) 6661 NewTD->setInvalidDecl(); 6662 6663 CheckTypedefForVariablyModifiedType(S, NewTD); 6664 Invalid |= NewTD->isInvalidDecl(); 6665 6666 bool Redeclaration = false; 6667 6668 NamedDecl *NewND; 6669 if (TemplateParamLists.size()) { 6670 TypeAliasTemplateDecl *OldDecl = 0; 6671 TemplateParameterList *OldTemplateParams = 0; 6672 6673 if (TemplateParamLists.size() != 1) { 6674 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6675 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6676 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6677 } 6678 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6679 6680 // Only consider previous declarations in the same scope. 6681 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6682 /*ExplicitInstantiationOrSpecialization*/false); 6683 if (!Previous.empty()) { 6684 Redeclaration = true; 6685 6686 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6687 if (!OldDecl && !Invalid) { 6688 Diag(UsingLoc, diag::err_redefinition_different_kind) 6689 << Name.Identifier; 6690 6691 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6692 if (OldD->getLocation().isValid()) 6693 Diag(OldD->getLocation(), diag::note_previous_definition); 6694 6695 Invalid = true; 6696 } 6697 6698 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6699 if (TemplateParameterListsAreEqual(TemplateParams, 6700 OldDecl->getTemplateParameters(), 6701 /*Complain=*/true, 6702 TPL_TemplateMatch)) 6703 OldTemplateParams = OldDecl->getTemplateParameters(); 6704 else 6705 Invalid = true; 6706 6707 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6708 if (!Invalid && 6709 !Context.hasSameType(OldTD->getUnderlyingType(), 6710 NewTD->getUnderlyingType())) { 6711 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6712 // but we can't reasonably accept it. 6713 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6714 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6715 if (OldTD->getLocation().isValid()) 6716 Diag(OldTD->getLocation(), diag::note_previous_definition); 6717 Invalid = true; 6718 } 6719 } 6720 } 6721 6722 // Merge any previous default template arguments into our parameters, 6723 // and check the parameter list. 6724 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6725 TPC_TypeAliasTemplate)) 6726 return 0; 6727 6728 TypeAliasTemplateDecl *NewDecl = 6729 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6730 Name.Identifier, TemplateParams, 6731 NewTD); 6732 6733 NewDecl->setAccess(AS); 6734 6735 if (Invalid) 6736 NewDecl->setInvalidDecl(); 6737 else if (OldDecl) 6738 NewDecl->setPreviousDeclaration(OldDecl); 6739 6740 NewND = NewDecl; 6741 } else { 6742 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6743 NewND = NewTD; 6744 } 6745 6746 if (!Redeclaration) 6747 PushOnScopeChains(NewND, S); 6748 6749 return NewND; 6750} 6751 6752Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6753 SourceLocation NamespaceLoc, 6754 SourceLocation AliasLoc, 6755 IdentifierInfo *Alias, 6756 CXXScopeSpec &SS, 6757 SourceLocation IdentLoc, 6758 IdentifierInfo *Ident) { 6759 6760 // Lookup the namespace name. 6761 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6762 LookupParsedName(R, S, &SS); 6763 6764 // Check if we have a previous declaration with the same name. 6765 NamedDecl *PrevDecl 6766 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6767 ForRedeclaration); 6768 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6769 PrevDecl = 0; 6770 6771 if (PrevDecl) { 6772 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6773 // We already have an alias with the same name that points to the same 6774 // namespace, so don't create a new one. 6775 // FIXME: At some point, we'll want to create the (redundant) 6776 // declaration to maintain better source information. 6777 if (!R.isAmbiguous() && !R.empty() && 6778 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6779 return 0; 6780 } 6781 6782 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6783 diag::err_redefinition_different_kind; 6784 Diag(AliasLoc, DiagID) << Alias; 6785 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6786 return 0; 6787 } 6788 6789 if (R.isAmbiguous()) 6790 return 0; 6791 6792 if (R.empty()) { 6793 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6794 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6795 return 0; 6796 } 6797 } 6798 6799 NamespaceAliasDecl *AliasDecl = 6800 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6801 Alias, SS.getWithLocInContext(Context), 6802 IdentLoc, R.getFoundDecl()); 6803 6804 PushOnScopeChains(AliasDecl, S); 6805 return AliasDecl; 6806} 6807 6808namespace { 6809 /// \brief Scoped object used to handle the state changes required in Sema 6810 /// to implicitly define the body of a C++ member function; 6811 class ImplicitlyDefinedFunctionScope { 6812 Sema &S; 6813 Sema::ContextRAII SavedContext; 6814 6815 public: 6816 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6817 : S(S), SavedContext(S, Method) 6818 { 6819 S.PushFunctionScope(); 6820 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6821 } 6822 6823 ~ImplicitlyDefinedFunctionScope() { 6824 S.PopExpressionEvaluationContext(); 6825 S.PopFunctionScopeInfo(); 6826 } 6827 }; 6828} 6829 6830Sema::ImplicitExceptionSpecification 6831Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6832 // C++ [except.spec]p14: 6833 // An implicitly declared special member function (Clause 12) shall have an 6834 // exception-specification. [...] 6835 ImplicitExceptionSpecification ExceptSpec(*this); 6836 if (ClassDecl->isInvalidDecl()) 6837 return ExceptSpec; 6838 6839 // Direct base-class constructors. 6840 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6841 BEnd = ClassDecl->bases_end(); 6842 B != BEnd; ++B) { 6843 if (B->isVirtual()) // Handled below. 6844 continue; 6845 6846 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6847 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6848 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6849 // If this is a deleted function, add it anyway. This might be conformant 6850 // with the standard. This might not. I'm not sure. It might not matter. 6851 if (Constructor) 6852 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6853 } 6854 } 6855 6856 // Virtual base-class constructors. 6857 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6858 BEnd = ClassDecl->vbases_end(); 6859 B != BEnd; ++B) { 6860 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6861 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6862 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6863 // If this is a deleted function, add it anyway. This might be conformant 6864 // with the standard. This might not. I'm not sure. It might not matter. 6865 if (Constructor) 6866 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6867 } 6868 } 6869 6870 // Field constructors. 6871 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6872 FEnd = ClassDecl->field_end(); 6873 F != FEnd; ++F) { 6874 if (F->hasInClassInitializer()) { 6875 if (Expr *E = F->getInClassInitializer()) 6876 ExceptSpec.CalledExpr(E); 6877 else if (!F->isInvalidDecl()) 6878 ExceptSpec.SetDelayed(); 6879 } else if (const RecordType *RecordTy 6880 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6881 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6882 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6883 // If this is a deleted function, add it anyway. This might be conformant 6884 // with the standard. This might not. I'm not sure. It might not matter. 6885 // In particular, the problem is that this function never gets called. It 6886 // might just be ill-formed because this function attempts to refer to 6887 // a deleted function here. 6888 if (Constructor) 6889 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 6890 } 6891 } 6892 6893 return ExceptSpec; 6894} 6895 6896CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6897 CXXRecordDecl *ClassDecl) { 6898 // C++ [class.ctor]p5: 6899 // A default constructor for a class X is a constructor of class X 6900 // that can be called without an argument. If there is no 6901 // user-declared constructor for class X, a default constructor is 6902 // implicitly declared. An implicitly-declared default constructor 6903 // is an inline public member of its class. 6904 assert(!ClassDecl->hasUserDeclaredConstructor() && 6905 "Should not build implicit default constructor!"); 6906 6907 ImplicitExceptionSpecification Spec = 6908 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6909 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6910 6911 // Create the actual constructor declaration. 6912 CanQualType ClassType 6913 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6914 SourceLocation ClassLoc = ClassDecl->getLocation(); 6915 DeclarationName Name 6916 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6917 DeclarationNameInfo NameInfo(Name, ClassLoc); 6918 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 6919 Context, ClassDecl, ClassLoc, NameInfo, 6920 Context.getFunctionType(Context.VoidTy, 0, 0, EPI), /*TInfo=*/0, 6921 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 6922 /*isConstexpr=*/ClassDecl->defaultedDefaultConstructorIsConstexpr() && 6923 getLangOpts().CPlusPlus0x); 6924 DefaultCon->setAccess(AS_public); 6925 DefaultCon->setDefaulted(); 6926 DefaultCon->setImplicit(); 6927 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6928 6929 // Note that we have declared this constructor. 6930 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6931 6932 if (Scope *S = getScopeForContext(ClassDecl)) 6933 PushOnScopeChains(DefaultCon, S, false); 6934 ClassDecl->addDecl(DefaultCon); 6935 6936 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6937 DefaultCon->setDeletedAsWritten(); 6938 6939 return DefaultCon; 6940} 6941 6942void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6943 CXXConstructorDecl *Constructor) { 6944 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6945 !Constructor->doesThisDeclarationHaveABody() && 6946 !Constructor->isDeleted()) && 6947 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6948 6949 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6950 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6951 6952 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6953 DiagnosticErrorTrap Trap(Diags); 6954 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6955 Trap.hasErrorOccurred()) { 6956 Diag(CurrentLocation, diag::note_member_synthesized_at) 6957 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6958 Constructor->setInvalidDecl(); 6959 return; 6960 } 6961 6962 SourceLocation Loc = Constructor->getLocation(); 6963 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6964 6965 Constructor->setUsed(); 6966 MarkVTableUsed(CurrentLocation, ClassDecl); 6967 6968 if (ASTMutationListener *L = getASTMutationListener()) { 6969 L->CompletedImplicitDefinition(Constructor); 6970 } 6971} 6972 6973/// Get any existing defaulted default constructor for the given class. Do not 6974/// implicitly define one if it does not exist. 6975static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6976 CXXRecordDecl *D) { 6977 ASTContext &Context = Self.Context; 6978 QualType ClassType = Context.getTypeDeclType(D); 6979 DeclarationName ConstructorName 6980 = Context.DeclarationNames.getCXXConstructorName( 6981 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6982 6983 DeclContext::lookup_const_iterator Con, ConEnd; 6984 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6985 Con != ConEnd; ++Con) { 6986 // A function template cannot be defaulted. 6987 if (isa<FunctionTemplateDecl>(*Con)) 6988 continue; 6989 6990 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6991 if (Constructor->isDefaultConstructor()) 6992 return Constructor->isDefaulted() ? Constructor : 0; 6993 } 6994 return 0; 6995} 6996 6997void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6998 if (!D) return; 6999 AdjustDeclIfTemplate(D); 7000 7001 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 7002 CXXConstructorDecl *CtorDecl 7003 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 7004 7005 if (!CtorDecl) return; 7006 7007 // Compute the exception specification for the default constructor. 7008 const FunctionProtoType *CtorTy = 7009 CtorDecl->getType()->castAs<FunctionProtoType>(); 7010 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 7011 // FIXME: Don't do this unless the exception spec is needed. 7012 ImplicitExceptionSpecification Spec = 7013 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 7014 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7015 assert(EPI.ExceptionSpecType != EST_Delayed); 7016 7017 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7018 } 7019 7020 // If the default constructor is explicitly defaulted, checking the exception 7021 // specification is deferred until now. 7022 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 7023 !ClassDecl->isDependentType()) 7024 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 7025} 7026 7027void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 7028 // We start with an initial pass over the base classes to collect those that 7029 // inherit constructors from. If there are none, we can forgo all further 7030 // processing. 7031 typedef SmallVector<const RecordType *, 4> BasesVector; 7032 BasesVector BasesToInheritFrom; 7033 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 7034 BaseE = ClassDecl->bases_end(); 7035 BaseIt != BaseE; ++BaseIt) { 7036 if (BaseIt->getInheritConstructors()) { 7037 QualType Base = BaseIt->getType(); 7038 if (Base->isDependentType()) { 7039 // If we inherit constructors from anything that is dependent, just 7040 // abort processing altogether. We'll get another chance for the 7041 // instantiations. 7042 return; 7043 } 7044 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 7045 } 7046 } 7047 if (BasesToInheritFrom.empty()) 7048 return; 7049 7050 // Now collect the constructors that we already have in the current class. 7051 // Those take precedence over inherited constructors. 7052 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 7053 // unless there is a user-declared constructor with the same signature in 7054 // the class where the using-declaration appears. 7055 llvm::SmallSet<const Type *, 8> ExistingConstructors; 7056 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 7057 CtorE = ClassDecl->ctor_end(); 7058 CtorIt != CtorE; ++CtorIt) { 7059 ExistingConstructors.insert( 7060 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 7061 } 7062 7063 DeclarationName CreatedCtorName = 7064 Context.DeclarationNames.getCXXConstructorName( 7065 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 7066 7067 // Now comes the true work. 7068 // First, we keep a map from constructor types to the base that introduced 7069 // them. Needed for finding conflicting constructors. We also keep the 7070 // actually inserted declarations in there, for pretty diagnostics. 7071 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 7072 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 7073 ConstructorToSourceMap InheritedConstructors; 7074 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 7075 BaseE = BasesToInheritFrom.end(); 7076 BaseIt != BaseE; ++BaseIt) { 7077 const RecordType *Base = *BaseIt; 7078 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 7079 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 7080 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 7081 CtorE = BaseDecl->ctor_end(); 7082 CtorIt != CtorE; ++CtorIt) { 7083 // Find the using declaration for inheriting this base's constructors. 7084 // FIXME: Don't perform name lookup just to obtain a source location! 7085 DeclarationName Name = 7086 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 7087 LookupResult Result(*this, Name, SourceLocation(), LookupUsingDeclName); 7088 LookupQualifiedName(Result, CurContext); 7089 UsingDecl *UD = Result.getAsSingle<UsingDecl>(); 7090 SourceLocation UsingLoc = UD ? UD->getLocation() : 7091 ClassDecl->getLocation(); 7092 7093 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 7094 // from the class X named in the using-declaration consists of actual 7095 // constructors and notional constructors that result from the 7096 // transformation of defaulted parameters as follows: 7097 // - all non-template default constructors of X, and 7098 // - for each non-template constructor of X that has at least one 7099 // parameter with a default argument, the set of constructors that 7100 // results from omitting any ellipsis parameter specification and 7101 // successively omitting parameters with a default argument from the 7102 // end of the parameter-type-list. 7103 CXXConstructorDecl *BaseCtor = &*CtorIt; 7104 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 7105 const FunctionProtoType *BaseCtorType = 7106 BaseCtor->getType()->getAs<FunctionProtoType>(); 7107 7108 for (unsigned params = BaseCtor->getMinRequiredArguments(), 7109 maxParams = BaseCtor->getNumParams(); 7110 params <= maxParams; ++params) { 7111 // Skip default constructors. They're never inherited. 7112 if (params == 0) 7113 continue; 7114 // Skip copy and move constructors for the same reason. 7115 if (CanBeCopyOrMove && params == 1) 7116 continue; 7117 7118 // Build up a function type for this particular constructor. 7119 // FIXME: The working paper does not consider that the exception spec 7120 // for the inheriting constructor might be larger than that of the 7121 // source. This code doesn't yet, either. When it does, this code will 7122 // need to be delayed until after exception specifications and in-class 7123 // member initializers are attached. 7124 const Type *NewCtorType; 7125 if (params == maxParams) 7126 NewCtorType = BaseCtorType; 7127 else { 7128 SmallVector<QualType, 16> Args; 7129 for (unsigned i = 0; i < params; ++i) { 7130 Args.push_back(BaseCtorType->getArgType(i)); 7131 } 7132 FunctionProtoType::ExtProtoInfo ExtInfo = 7133 BaseCtorType->getExtProtoInfo(); 7134 ExtInfo.Variadic = false; 7135 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7136 Args.data(), params, ExtInfo) 7137 .getTypePtr(); 7138 } 7139 const Type *CanonicalNewCtorType = 7140 Context.getCanonicalType(NewCtorType); 7141 7142 // Now that we have the type, first check if the class already has a 7143 // constructor with this signature. 7144 if (ExistingConstructors.count(CanonicalNewCtorType)) 7145 continue; 7146 7147 // Then we check if we have already declared an inherited constructor 7148 // with this signature. 7149 std::pair<ConstructorToSourceMap::iterator, bool> result = 7150 InheritedConstructors.insert(std::make_pair( 7151 CanonicalNewCtorType, 7152 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7153 if (!result.second) { 7154 // Already in the map. If it came from a different class, that's an 7155 // error. Not if it's from the same. 7156 CanQualType PreviousBase = result.first->second.first; 7157 if (CanonicalBase != PreviousBase) { 7158 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7159 const CXXConstructorDecl *PrevBaseCtor = 7160 PrevCtor->getInheritedConstructor(); 7161 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7162 7163 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7164 Diag(BaseCtor->getLocation(), 7165 diag::note_using_decl_constructor_conflict_current_ctor); 7166 Diag(PrevBaseCtor->getLocation(), 7167 diag::note_using_decl_constructor_conflict_previous_ctor); 7168 Diag(PrevCtor->getLocation(), 7169 diag::note_using_decl_constructor_conflict_previous_using); 7170 } 7171 continue; 7172 } 7173 7174 // OK, we're there, now add the constructor. 7175 // C++0x [class.inhctor]p8: [...] that would be performed by a 7176 // user-written inline constructor [...] 7177 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7178 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7179 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7180 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7181 /*ImplicitlyDeclared=*/true, 7182 // FIXME: Due to a defect in the standard, we treat inherited 7183 // constructors as constexpr even if that makes them ill-formed. 7184 /*Constexpr=*/BaseCtor->isConstexpr()); 7185 NewCtor->setAccess(BaseCtor->getAccess()); 7186 7187 // Build up the parameter decls and add them. 7188 SmallVector<ParmVarDecl *, 16> ParamDecls; 7189 for (unsigned i = 0; i < params; ++i) { 7190 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7191 UsingLoc, UsingLoc, 7192 /*IdentifierInfo=*/0, 7193 BaseCtorType->getArgType(i), 7194 /*TInfo=*/0, SC_None, 7195 SC_None, /*DefaultArg=*/0)); 7196 } 7197 NewCtor->setParams(ParamDecls); 7198 NewCtor->setInheritedConstructor(BaseCtor); 7199 7200 ClassDecl->addDecl(NewCtor); 7201 result.first->second.second = NewCtor; 7202 } 7203 } 7204 } 7205} 7206 7207Sema::ImplicitExceptionSpecification 7208Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7209 // C++ [except.spec]p14: 7210 // An implicitly declared special member function (Clause 12) shall have 7211 // an exception-specification. 7212 ImplicitExceptionSpecification ExceptSpec(*this); 7213 if (ClassDecl->isInvalidDecl()) 7214 return ExceptSpec; 7215 7216 // Direct base-class destructors. 7217 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7218 BEnd = ClassDecl->bases_end(); 7219 B != BEnd; ++B) { 7220 if (B->isVirtual()) // Handled below. 7221 continue; 7222 7223 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7224 ExceptSpec.CalledDecl(B->getLocStart(), 7225 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7226 } 7227 7228 // Virtual base-class destructors. 7229 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7230 BEnd = ClassDecl->vbases_end(); 7231 B != BEnd; ++B) { 7232 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7233 ExceptSpec.CalledDecl(B->getLocStart(), 7234 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7235 } 7236 7237 // Field destructors. 7238 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7239 FEnd = ClassDecl->field_end(); 7240 F != FEnd; ++F) { 7241 if (const RecordType *RecordTy 7242 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7243 ExceptSpec.CalledDecl(F->getLocation(), 7244 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7245 } 7246 7247 return ExceptSpec; 7248} 7249 7250CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7251 // C++ [class.dtor]p2: 7252 // If a class has no user-declared destructor, a destructor is 7253 // declared implicitly. An implicitly-declared destructor is an 7254 // inline public member of its class. 7255 7256 ImplicitExceptionSpecification Spec = 7257 ComputeDefaultedDtorExceptionSpec(ClassDecl); 7258 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7259 7260 // Create the actual destructor declaration. 7261 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 7262 7263 CanQualType ClassType 7264 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7265 SourceLocation ClassLoc = ClassDecl->getLocation(); 7266 DeclarationName Name 7267 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7268 DeclarationNameInfo NameInfo(Name, ClassLoc); 7269 CXXDestructorDecl *Destructor 7270 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 7271 /*isInline=*/true, 7272 /*isImplicitlyDeclared=*/true); 7273 Destructor->setAccess(AS_public); 7274 Destructor->setDefaulted(); 7275 Destructor->setImplicit(); 7276 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7277 7278 // Note that we have declared this destructor. 7279 ++ASTContext::NumImplicitDestructorsDeclared; 7280 7281 // Introduce this destructor into its scope. 7282 if (Scope *S = getScopeForContext(ClassDecl)) 7283 PushOnScopeChains(Destructor, S, false); 7284 ClassDecl->addDecl(Destructor); 7285 7286 // This could be uniqued if it ever proves significant. 7287 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 7288 7289 AddOverriddenMethods(ClassDecl, Destructor); 7290 7291 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 7292 Destructor->setDeletedAsWritten(); 7293 7294 return Destructor; 7295} 7296 7297void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7298 CXXDestructorDecl *Destructor) { 7299 assert((Destructor->isDefaulted() && 7300 !Destructor->doesThisDeclarationHaveABody() && 7301 !Destructor->isDeleted()) && 7302 "DefineImplicitDestructor - call it for implicit default dtor"); 7303 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7304 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7305 7306 if (Destructor->isInvalidDecl()) 7307 return; 7308 7309 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7310 7311 DiagnosticErrorTrap Trap(Diags); 7312 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7313 Destructor->getParent()); 7314 7315 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7316 Diag(CurrentLocation, diag::note_member_synthesized_at) 7317 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7318 7319 Destructor->setInvalidDecl(); 7320 return; 7321 } 7322 7323 SourceLocation Loc = Destructor->getLocation(); 7324 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7325 Destructor->setImplicitlyDefined(true); 7326 Destructor->setUsed(); 7327 MarkVTableUsed(CurrentLocation, ClassDecl); 7328 7329 if (ASTMutationListener *L = getASTMutationListener()) { 7330 L->CompletedImplicitDefinition(Destructor); 7331 } 7332} 7333 7334/// \brief Perform any semantic analysis which needs to be delayed until all 7335/// pending class member declarations have been parsed. 7336void Sema::ActOnFinishCXXMemberDecls() { 7337 // Now we have parsed all exception specifications, determine the implicit 7338 // exception specifications for destructors. 7339 for (unsigned i = 0, e = DelayedDestructorExceptionSpecs.size(); 7340 i != e; ++i) { 7341 CXXDestructorDecl *Dtor = DelayedDestructorExceptionSpecs[i]; 7342 AdjustDestructorExceptionSpec(Dtor->getParent(), Dtor, true); 7343 } 7344 DelayedDestructorExceptionSpecs.clear(); 7345 7346 // Perform any deferred checking of exception specifications for virtual 7347 // destructors. 7348 for (unsigned i = 0, e = DelayedDestructorExceptionSpecChecks.size(); 7349 i != e; ++i) { 7350 const CXXDestructorDecl *Dtor = 7351 DelayedDestructorExceptionSpecChecks[i].first; 7352 assert(!Dtor->getParent()->isDependentType() && 7353 "Should not ever add destructors of templates into the list."); 7354 CheckOverridingFunctionExceptionSpec(Dtor, 7355 DelayedDestructorExceptionSpecChecks[i].second); 7356 } 7357 DelayedDestructorExceptionSpecChecks.clear(); 7358} 7359 7360void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 7361 CXXDestructorDecl *destructor, 7362 bool WasDelayed) { 7363 // C++11 [class.dtor]p3: 7364 // A declaration of a destructor that does not have an exception- 7365 // specification is implicitly considered to have the same exception- 7366 // specification as an implicit declaration. 7367 const FunctionProtoType *dtorType = destructor->getType()-> 7368 getAs<FunctionProtoType>(); 7369 if (!WasDelayed && dtorType->hasExceptionSpec()) 7370 return; 7371 7372 ImplicitExceptionSpecification exceptSpec = 7373 ComputeDefaultedDtorExceptionSpec(classDecl); 7374 7375 // Replace the destructor's type, building off the existing one. Fortunately, 7376 // the only thing of interest in the destructor type is its extended info. 7377 // The return and arguments are fixed. 7378 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 7379 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 7380 epi.NumExceptions = exceptSpec.size(); 7381 epi.Exceptions = exceptSpec.data(); 7382 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 7383 7384 destructor->setType(ty); 7385 7386 // If we can't compute the exception specification for this destructor yet 7387 // (because it depends on an exception specification which we have not parsed 7388 // yet), make a note that we need to try again when the class is complete. 7389 if (epi.ExceptionSpecType == EST_Delayed) { 7390 assert(!WasDelayed && "couldn't compute destructor exception spec"); 7391 DelayedDestructorExceptionSpecs.push_back(destructor); 7392 } 7393 7394 // FIXME: If the destructor has a body that could throw, and the newly created 7395 // spec doesn't allow exceptions, we should emit a warning, because this 7396 // change in behavior can break conforming C++03 programs at runtime. 7397 // However, we don't have a body yet, so it needs to be done somewhere else. 7398} 7399 7400/// \brief Builds a statement that copies/moves the given entity from \p From to 7401/// \c To. 7402/// 7403/// This routine is used to copy/move the members of a class with an 7404/// implicitly-declared copy/move assignment operator. When the entities being 7405/// copied are arrays, this routine builds for loops to copy them. 7406/// 7407/// \param S The Sema object used for type-checking. 7408/// 7409/// \param Loc The location where the implicit copy/move is being generated. 7410/// 7411/// \param T The type of the expressions being copied/moved. Both expressions 7412/// must have this type. 7413/// 7414/// \param To The expression we are copying/moving to. 7415/// 7416/// \param From The expression we are copying/moving from. 7417/// 7418/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7419/// Otherwise, it's a non-static member subobject. 7420/// 7421/// \param Copying Whether we're copying or moving. 7422/// 7423/// \param Depth Internal parameter recording the depth of the recursion. 7424/// 7425/// \returns A statement or a loop that copies the expressions. 7426static StmtResult 7427BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7428 Expr *To, Expr *From, 7429 bool CopyingBaseSubobject, bool Copying, 7430 unsigned Depth = 0) { 7431 // C++0x [class.copy]p28: 7432 // Each subobject is assigned in the manner appropriate to its type: 7433 // 7434 // - if the subobject is of class type, as if by a call to operator= with 7435 // the subobject as the object expression and the corresponding 7436 // subobject of x as a single function argument (as if by explicit 7437 // qualification; that is, ignoring any possible virtual overriding 7438 // functions in more derived classes); 7439 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7440 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7441 7442 // Look for operator=. 7443 DeclarationName Name 7444 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7445 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7446 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7447 7448 // Filter out any result that isn't a copy/move-assignment operator. 7449 LookupResult::Filter F = OpLookup.makeFilter(); 7450 while (F.hasNext()) { 7451 NamedDecl *D = F.next(); 7452 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7453 if (Method->isCopyAssignmentOperator() || 7454 (!Copying && Method->isMoveAssignmentOperator())) 7455 continue; 7456 7457 F.erase(); 7458 } 7459 F.done(); 7460 7461 // Suppress the protected check (C++ [class.protected]) for each of the 7462 // assignment operators we found. This strange dance is required when 7463 // we're assigning via a base classes's copy-assignment operator. To 7464 // ensure that we're getting the right base class subobject (without 7465 // ambiguities), we need to cast "this" to that subobject type; to 7466 // ensure that we don't go through the virtual call mechanism, we need 7467 // to qualify the operator= name with the base class (see below). However, 7468 // this means that if the base class has a protected copy assignment 7469 // operator, the protected member access check will fail. So, we 7470 // rewrite "protected" access to "public" access in this case, since we 7471 // know by construction that we're calling from a derived class. 7472 if (CopyingBaseSubobject) { 7473 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7474 L != LEnd; ++L) { 7475 if (L.getAccess() == AS_protected) 7476 L.setAccess(AS_public); 7477 } 7478 } 7479 7480 // Create the nested-name-specifier that will be used to qualify the 7481 // reference to operator=; this is required to suppress the virtual 7482 // call mechanism. 7483 CXXScopeSpec SS; 7484 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 7485 SS.MakeTrivial(S.Context, 7486 NestedNameSpecifier::Create(S.Context, 0, false, 7487 CanonicalT), 7488 Loc); 7489 7490 // Create the reference to operator=. 7491 ExprResult OpEqualRef 7492 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7493 /*TemplateKWLoc=*/SourceLocation(), 7494 /*FirstQualifierInScope=*/0, 7495 OpLookup, 7496 /*TemplateArgs=*/0, 7497 /*SuppressQualifierCheck=*/true); 7498 if (OpEqualRef.isInvalid()) 7499 return StmtError(); 7500 7501 // Build the call to the assignment operator. 7502 7503 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7504 OpEqualRef.takeAs<Expr>(), 7505 Loc, &From, 1, Loc); 7506 if (Call.isInvalid()) 7507 return StmtError(); 7508 7509 return S.Owned(Call.takeAs<Stmt>()); 7510 } 7511 7512 // - if the subobject is of scalar type, the built-in assignment 7513 // operator is used. 7514 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7515 if (!ArrayTy) { 7516 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7517 if (Assignment.isInvalid()) 7518 return StmtError(); 7519 7520 return S.Owned(Assignment.takeAs<Stmt>()); 7521 } 7522 7523 // - if the subobject is an array, each element is assigned, in the 7524 // manner appropriate to the element type; 7525 7526 // Construct a loop over the array bounds, e.g., 7527 // 7528 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7529 // 7530 // that will copy each of the array elements. 7531 QualType SizeType = S.Context.getSizeType(); 7532 7533 // Create the iteration variable. 7534 IdentifierInfo *IterationVarName = 0; 7535 { 7536 SmallString<8> Str; 7537 llvm::raw_svector_ostream OS(Str); 7538 OS << "__i" << Depth; 7539 IterationVarName = &S.Context.Idents.get(OS.str()); 7540 } 7541 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7542 IterationVarName, SizeType, 7543 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7544 SC_None, SC_None); 7545 7546 // Initialize the iteration variable to zero. 7547 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7548 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7549 7550 // Create a reference to the iteration variable; we'll use this several 7551 // times throughout. 7552 Expr *IterationVarRef 7553 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 7554 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7555 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 7556 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 7557 7558 // Create the DeclStmt that holds the iteration variable. 7559 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7560 7561 // Create the comparison against the array bound. 7562 llvm::APInt Upper 7563 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7564 Expr *Comparison 7565 = new (S.Context) BinaryOperator(IterationVarRefRVal, 7566 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7567 BO_NE, S.Context.BoolTy, 7568 VK_RValue, OK_Ordinary, Loc); 7569 7570 // Create the pre-increment of the iteration variable. 7571 Expr *Increment 7572 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7573 VK_LValue, OK_Ordinary, Loc); 7574 7575 // Subscript the "from" and "to" expressions with the iteration variable. 7576 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7577 IterationVarRefRVal, 7578 Loc)); 7579 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7580 IterationVarRefRVal, 7581 Loc)); 7582 if (!Copying) // Cast to rvalue 7583 From = CastForMoving(S, From); 7584 7585 // Build the copy/move for an individual element of the array. 7586 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7587 To, From, CopyingBaseSubobject, 7588 Copying, Depth + 1); 7589 if (Copy.isInvalid()) 7590 return StmtError(); 7591 7592 // Construct the loop that copies all elements of this array. 7593 return S.ActOnForStmt(Loc, Loc, InitStmt, 7594 S.MakeFullExpr(Comparison), 7595 0, S.MakeFullExpr(Increment), 7596 Loc, Copy.take()); 7597} 7598 7599std::pair<Sema::ImplicitExceptionSpecification, bool> 7600Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7601 CXXRecordDecl *ClassDecl) { 7602 if (ClassDecl->isInvalidDecl()) 7603 return std::make_pair(ImplicitExceptionSpecification(*this), false); 7604 7605 // C++ [class.copy]p10: 7606 // If the class definition does not explicitly declare a copy 7607 // assignment operator, one is declared implicitly. 7608 // The implicitly-defined copy assignment operator for a class X 7609 // will have the form 7610 // 7611 // X& X::operator=(const X&) 7612 // 7613 // if 7614 bool HasConstCopyAssignment = true; 7615 7616 // -- each direct base class B of X has a copy assignment operator 7617 // whose parameter is of type const B&, const volatile B& or B, 7618 // and 7619 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7620 BaseEnd = ClassDecl->bases_end(); 7621 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7622 // We'll handle this below 7623 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7624 continue; 7625 7626 assert(!Base->getType()->isDependentType() && 7627 "Cannot generate implicit members for class with dependent bases."); 7628 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7629 HasConstCopyAssignment &= 7630 (bool)LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, 7631 false, 0); 7632 } 7633 7634 // In C++11, the above citation has "or virtual" added 7635 if (LangOpts.CPlusPlus0x) { 7636 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7637 BaseEnd = ClassDecl->vbases_end(); 7638 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7639 assert(!Base->getType()->isDependentType() && 7640 "Cannot generate implicit members for class with dependent bases."); 7641 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7642 HasConstCopyAssignment &= 7643 (bool)LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, 7644 false, 0); 7645 } 7646 } 7647 7648 // -- for all the nonstatic data members of X that are of a class 7649 // type M (or array thereof), each such class type has a copy 7650 // assignment operator whose parameter is of type const M&, 7651 // const volatile M& or M. 7652 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7653 FieldEnd = ClassDecl->field_end(); 7654 HasConstCopyAssignment && Field != FieldEnd; 7655 ++Field) { 7656 QualType FieldType = Context.getBaseElementType(Field->getType()); 7657 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7658 HasConstCopyAssignment &= 7659 (bool)LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, 7660 false, 0); 7661 } 7662 } 7663 7664 // Otherwise, the implicitly declared copy assignment operator will 7665 // have the form 7666 // 7667 // X& X::operator=(X&) 7668 7669 // C++ [except.spec]p14: 7670 // An implicitly declared special member function (Clause 12) shall have an 7671 // exception-specification. [...] 7672 7673 // It is unspecified whether or not an implicit copy assignment operator 7674 // attempts to deduplicate calls to assignment operators of virtual bases are 7675 // made. As such, this exception specification is effectively unspecified. 7676 // Based on a similar decision made for constness in C++0x, we're erring on 7677 // the side of assuming such calls to be made regardless of whether they 7678 // actually happen. 7679 ImplicitExceptionSpecification ExceptSpec(*this); 7680 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7681 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7682 BaseEnd = ClassDecl->bases_end(); 7683 Base != BaseEnd; ++Base) { 7684 if (Base->isVirtual()) 7685 continue; 7686 7687 CXXRecordDecl *BaseClassDecl 7688 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7689 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7690 ArgQuals, false, 0)) 7691 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7692 } 7693 7694 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7695 BaseEnd = ClassDecl->vbases_end(); 7696 Base != BaseEnd; ++Base) { 7697 CXXRecordDecl *BaseClassDecl 7698 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7699 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7700 ArgQuals, false, 0)) 7701 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7702 } 7703 7704 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7705 FieldEnd = ClassDecl->field_end(); 7706 Field != FieldEnd; 7707 ++Field) { 7708 QualType FieldType = Context.getBaseElementType(Field->getType()); 7709 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7710 if (CXXMethodDecl *CopyAssign = 7711 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7712 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign); 7713 } 7714 } 7715 7716 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7717} 7718 7719CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7720 // Note: The following rules are largely analoguous to the copy 7721 // constructor rules. Note that virtual bases are not taken into account 7722 // for determining the argument type of the operator. Note also that 7723 // operators taking an object instead of a reference are allowed. 7724 7725 ImplicitExceptionSpecification Spec(*this); 7726 bool Const; 7727 llvm::tie(Spec, Const) = 7728 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7729 7730 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7731 QualType RetType = Context.getLValueReferenceType(ArgType); 7732 if (Const) 7733 ArgType = ArgType.withConst(); 7734 ArgType = Context.getLValueReferenceType(ArgType); 7735 7736 // An implicitly-declared copy assignment operator is an inline public 7737 // member of its class. 7738 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7739 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7740 SourceLocation ClassLoc = ClassDecl->getLocation(); 7741 DeclarationNameInfo NameInfo(Name, ClassLoc); 7742 CXXMethodDecl *CopyAssignment 7743 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7744 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7745 /*TInfo=*/0, /*isStatic=*/false, 7746 /*StorageClassAsWritten=*/SC_None, 7747 /*isInline=*/true, /*isConstexpr=*/false, 7748 SourceLocation()); 7749 CopyAssignment->setAccess(AS_public); 7750 CopyAssignment->setDefaulted(); 7751 CopyAssignment->setImplicit(); 7752 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7753 7754 // Add the parameter to the operator. 7755 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7756 ClassLoc, ClassLoc, /*Id=*/0, 7757 ArgType, /*TInfo=*/0, 7758 SC_None, 7759 SC_None, 0); 7760 CopyAssignment->setParams(FromParam); 7761 7762 // Note that we have added this copy-assignment operator. 7763 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7764 7765 if (Scope *S = getScopeForContext(ClassDecl)) 7766 PushOnScopeChains(CopyAssignment, S, false); 7767 ClassDecl->addDecl(CopyAssignment); 7768 7769 // C++0x [class.copy]p19: 7770 // .... If the class definition does not explicitly declare a copy 7771 // assignment operator, there is no user-declared move constructor, and 7772 // there is no user-declared move assignment operator, a copy assignment 7773 // operator is implicitly declared as defaulted. 7774 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 7775 CopyAssignment->setDeletedAsWritten(); 7776 7777 AddOverriddenMethods(ClassDecl, CopyAssignment); 7778 return CopyAssignment; 7779} 7780 7781void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7782 CXXMethodDecl *CopyAssignOperator) { 7783 assert((CopyAssignOperator->isDefaulted() && 7784 CopyAssignOperator->isOverloadedOperator() && 7785 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7786 !CopyAssignOperator->doesThisDeclarationHaveABody() && 7787 !CopyAssignOperator->isDeleted()) && 7788 "DefineImplicitCopyAssignment called for wrong function"); 7789 7790 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7791 7792 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7793 CopyAssignOperator->setInvalidDecl(); 7794 return; 7795 } 7796 7797 CopyAssignOperator->setUsed(); 7798 7799 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7800 DiagnosticErrorTrap Trap(Diags); 7801 7802 // C++0x [class.copy]p30: 7803 // The implicitly-defined or explicitly-defaulted copy assignment operator 7804 // for a non-union class X performs memberwise copy assignment of its 7805 // subobjects. The direct base classes of X are assigned first, in the 7806 // order of their declaration in the base-specifier-list, and then the 7807 // immediate non-static data members of X are assigned, in the order in 7808 // which they were declared in the class definition. 7809 7810 // The statements that form the synthesized function body. 7811 ASTOwningVector<Stmt*> Statements(*this); 7812 7813 // The parameter for the "other" object, which we are copying from. 7814 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7815 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7816 QualType OtherRefType = Other->getType(); 7817 if (const LValueReferenceType *OtherRef 7818 = OtherRefType->getAs<LValueReferenceType>()) { 7819 OtherRefType = OtherRef->getPointeeType(); 7820 OtherQuals = OtherRefType.getQualifiers(); 7821 } 7822 7823 // Our location for everything implicitly-generated. 7824 SourceLocation Loc = CopyAssignOperator->getLocation(); 7825 7826 // Construct a reference to the "other" object. We'll be using this 7827 // throughout the generated ASTs. 7828 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7829 assert(OtherRef && "Reference to parameter cannot fail!"); 7830 7831 // Construct the "this" pointer. We'll be using this throughout the generated 7832 // ASTs. 7833 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7834 assert(This && "Reference to this cannot fail!"); 7835 7836 // Assign base classes. 7837 bool Invalid = false; 7838 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7839 E = ClassDecl->bases_end(); Base != E; ++Base) { 7840 // Form the assignment: 7841 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7842 QualType BaseType = Base->getType().getUnqualifiedType(); 7843 if (!BaseType->isRecordType()) { 7844 Invalid = true; 7845 continue; 7846 } 7847 7848 CXXCastPath BasePath; 7849 BasePath.push_back(Base); 7850 7851 // Construct the "from" expression, which is an implicit cast to the 7852 // appropriately-qualified base type. 7853 Expr *From = OtherRef; 7854 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7855 CK_UncheckedDerivedToBase, 7856 VK_LValue, &BasePath).take(); 7857 7858 // Dereference "this". 7859 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7860 7861 // Implicitly cast "this" to the appropriately-qualified base type. 7862 To = ImpCastExprToType(To.take(), 7863 Context.getCVRQualifiedType(BaseType, 7864 CopyAssignOperator->getTypeQualifiers()), 7865 CK_UncheckedDerivedToBase, 7866 VK_LValue, &BasePath); 7867 7868 // Build the copy. 7869 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7870 To.get(), From, 7871 /*CopyingBaseSubobject=*/true, 7872 /*Copying=*/true); 7873 if (Copy.isInvalid()) { 7874 Diag(CurrentLocation, diag::note_member_synthesized_at) 7875 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7876 CopyAssignOperator->setInvalidDecl(); 7877 return; 7878 } 7879 7880 // Success! Record the copy. 7881 Statements.push_back(Copy.takeAs<Expr>()); 7882 } 7883 7884 // \brief Reference to the __builtin_memcpy function. 7885 Expr *BuiltinMemCpyRef = 0; 7886 // \brief Reference to the __builtin_objc_memmove_collectable function. 7887 Expr *CollectableMemCpyRef = 0; 7888 7889 // Assign non-static members. 7890 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7891 FieldEnd = ClassDecl->field_end(); 7892 Field != FieldEnd; ++Field) { 7893 if (Field->isUnnamedBitfield()) 7894 continue; 7895 7896 // Check for members of reference type; we can't copy those. 7897 if (Field->getType()->isReferenceType()) { 7898 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7899 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7900 Diag(Field->getLocation(), diag::note_declared_at); 7901 Diag(CurrentLocation, diag::note_member_synthesized_at) 7902 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7903 Invalid = true; 7904 continue; 7905 } 7906 7907 // Check for members of const-qualified, non-class type. 7908 QualType BaseType = Context.getBaseElementType(Field->getType()); 7909 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7910 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7911 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7912 Diag(Field->getLocation(), diag::note_declared_at); 7913 Diag(CurrentLocation, diag::note_member_synthesized_at) 7914 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7915 Invalid = true; 7916 continue; 7917 } 7918 7919 // Suppress assigning zero-width bitfields. 7920 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7921 continue; 7922 7923 QualType FieldType = Field->getType().getNonReferenceType(); 7924 if (FieldType->isIncompleteArrayType()) { 7925 assert(ClassDecl->hasFlexibleArrayMember() && 7926 "Incomplete array type is not valid"); 7927 continue; 7928 } 7929 7930 // Build references to the field in the object we're copying from and to. 7931 CXXScopeSpec SS; // Intentionally empty 7932 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7933 LookupMemberName); 7934 MemberLookup.addDecl(&*Field); 7935 MemberLookup.resolveKind(); 7936 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7937 Loc, /*IsArrow=*/false, 7938 SS, SourceLocation(), 0, 7939 MemberLookup, 0); 7940 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7941 Loc, /*IsArrow=*/true, 7942 SS, SourceLocation(), 0, 7943 MemberLookup, 0); 7944 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7945 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7946 7947 // If the field should be copied with __builtin_memcpy rather than via 7948 // explicit assignments, do so. This optimization only applies for arrays 7949 // of scalars and arrays of class type with trivial copy-assignment 7950 // operators. 7951 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7952 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7953 // Compute the size of the memory buffer to be copied. 7954 QualType SizeType = Context.getSizeType(); 7955 llvm::APInt Size(Context.getTypeSize(SizeType), 7956 Context.getTypeSizeInChars(BaseType).getQuantity()); 7957 for (const ConstantArrayType *Array 7958 = Context.getAsConstantArrayType(FieldType); 7959 Array; 7960 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7961 llvm::APInt ArraySize 7962 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7963 Size *= ArraySize; 7964 } 7965 7966 // Take the address of the field references for "from" and "to". 7967 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7968 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7969 7970 bool NeedsCollectableMemCpy = 7971 (BaseType->isRecordType() && 7972 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7973 7974 if (NeedsCollectableMemCpy) { 7975 if (!CollectableMemCpyRef) { 7976 // Create a reference to the __builtin_objc_memmove_collectable function. 7977 LookupResult R(*this, 7978 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7979 Loc, LookupOrdinaryName); 7980 LookupName(R, TUScope, true); 7981 7982 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7983 if (!CollectableMemCpy) { 7984 // Something went horribly wrong earlier, and we will have 7985 // complained about it. 7986 Invalid = true; 7987 continue; 7988 } 7989 7990 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7991 CollectableMemCpy->getType(), 7992 VK_LValue, Loc, 0).take(); 7993 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7994 } 7995 } 7996 // Create a reference to the __builtin_memcpy builtin function. 7997 else if (!BuiltinMemCpyRef) { 7998 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7999 LookupOrdinaryName); 8000 LookupName(R, TUScope, true); 8001 8002 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8003 if (!BuiltinMemCpy) { 8004 // Something went horribly wrong earlier, and we will have complained 8005 // about it. 8006 Invalid = true; 8007 continue; 8008 } 8009 8010 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8011 BuiltinMemCpy->getType(), 8012 VK_LValue, Loc, 0).take(); 8013 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8014 } 8015 8016 ASTOwningVector<Expr*> CallArgs(*this); 8017 CallArgs.push_back(To.takeAs<Expr>()); 8018 CallArgs.push_back(From.takeAs<Expr>()); 8019 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8020 ExprResult Call = ExprError(); 8021 if (NeedsCollectableMemCpy) 8022 Call = ActOnCallExpr(/*Scope=*/0, 8023 CollectableMemCpyRef, 8024 Loc, move_arg(CallArgs), 8025 Loc); 8026 else 8027 Call = ActOnCallExpr(/*Scope=*/0, 8028 BuiltinMemCpyRef, 8029 Loc, move_arg(CallArgs), 8030 Loc); 8031 8032 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8033 Statements.push_back(Call.takeAs<Expr>()); 8034 continue; 8035 } 8036 8037 // Build the copy of this field. 8038 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 8039 To.get(), From.get(), 8040 /*CopyingBaseSubobject=*/false, 8041 /*Copying=*/true); 8042 if (Copy.isInvalid()) { 8043 Diag(CurrentLocation, diag::note_member_synthesized_at) 8044 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8045 CopyAssignOperator->setInvalidDecl(); 8046 return; 8047 } 8048 8049 // Success! Record the copy. 8050 Statements.push_back(Copy.takeAs<Stmt>()); 8051 } 8052 8053 if (!Invalid) { 8054 // Add a "return *this;" 8055 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8056 8057 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8058 if (Return.isInvalid()) 8059 Invalid = true; 8060 else { 8061 Statements.push_back(Return.takeAs<Stmt>()); 8062 8063 if (Trap.hasErrorOccurred()) { 8064 Diag(CurrentLocation, diag::note_member_synthesized_at) 8065 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8066 Invalid = true; 8067 } 8068 } 8069 } 8070 8071 if (Invalid) { 8072 CopyAssignOperator->setInvalidDecl(); 8073 return; 8074 } 8075 8076 StmtResult Body; 8077 { 8078 CompoundScopeRAII CompoundScope(*this); 8079 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8080 /*isStmtExpr=*/false); 8081 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8082 } 8083 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 8084 8085 if (ASTMutationListener *L = getASTMutationListener()) { 8086 L->CompletedImplicitDefinition(CopyAssignOperator); 8087 } 8088} 8089 8090Sema::ImplicitExceptionSpecification 8091Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 8092 ImplicitExceptionSpecification ExceptSpec(*this); 8093 8094 if (ClassDecl->isInvalidDecl()) 8095 return ExceptSpec; 8096 8097 // C++0x [except.spec]p14: 8098 // An implicitly declared special member function (Clause 12) shall have an 8099 // exception-specification. [...] 8100 8101 // It is unspecified whether or not an implicit move assignment operator 8102 // attempts to deduplicate calls to assignment operators of virtual bases are 8103 // made. As such, this exception specification is effectively unspecified. 8104 // Based on a similar decision made for constness in C++0x, we're erring on 8105 // the side of assuming such calls to be made regardless of whether they 8106 // actually happen. 8107 // Note that a move constructor is not implicitly declared when there are 8108 // virtual bases, but it can still be user-declared and explicitly defaulted. 8109 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8110 BaseEnd = ClassDecl->bases_end(); 8111 Base != BaseEnd; ++Base) { 8112 if (Base->isVirtual()) 8113 continue; 8114 8115 CXXRecordDecl *BaseClassDecl 8116 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8117 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8118 false, 0)) 8119 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 8120 } 8121 8122 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8123 BaseEnd = ClassDecl->vbases_end(); 8124 Base != BaseEnd; ++Base) { 8125 CXXRecordDecl *BaseClassDecl 8126 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8127 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8128 false, 0)) 8129 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 8130 } 8131 8132 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8133 FieldEnd = ClassDecl->field_end(); 8134 Field != FieldEnd; 8135 ++Field) { 8136 QualType FieldType = Context.getBaseElementType(Field->getType()); 8137 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8138 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 8139 false, 0)) 8140 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign); 8141 } 8142 } 8143 8144 return ExceptSpec; 8145} 8146 8147/// Determine whether the class type has any direct or indirect virtual base 8148/// classes which have a non-trivial move assignment operator. 8149static bool 8150hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) { 8151 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8152 BaseEnd = ClassDecl->vbases_end(); 8153 Base != BaseEnd; ++Base) { 8154 CXXRecordDecl *BaseClass = 8155 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8156 8157 // Try to declare the move assignment. If it would be deleted, then the 8158 // class does not have a non-trivial move assignment. 8159 if (BaseClass->needsImplicitMoveAssignment()) 8160 S.DeclareImplicitMoveAssignment(BaseClass); 8161 8162 // If the class has both a trivial move assignment and a non-trivial move 8163 // assignment, hasTrivialMoveAssignment() is false. 8164 if (BaseClass->hasDeclaredMoveAssignment() && 8165 !BaseClass->hasTrivialMoveAssignment()) 8166 return true; 8167 } 8168 8169 return false; 8170} 8171 8172/// Determine whether the given type either has a move constructor or is 8173/// trivially copyable. 8174static bool 8175hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) { 8176 Type = S.Context.getBaseElementType(Type); 8177 8178 // FIXME: Technically, non-trivially-copyable non-class types, such as 8179 // reference types, are supposed to return false here, but that appears 8180 // to be a standard defect. 8181 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl(); 8182 if (!ClassDecl || !ClassDecl->getDefinition()) 8183 return true; 8184 8185 if (Type.isTriviallyCopyableType(S.Context)) 8186 return true; 8187 8188 if (IsConstructor) { 8189 if (ClassDecl->needsImplicitMoveConstructor()) 8190 S.DeclareImplicitMoveConstructor(ClassDecl); 8191 return ClassDecl->hasDeclaredMoveConstructor(); 8192 } 8193 8194 if (ClassDecl->needsImplicitMoveAssignment()) 8195 S.DeclareImplicitMoveAssignment(ClassDecl); 8196 return ClassDecl->hasDeclaredMoveAssignment(); 8197} 8198 8199/// Determine whether all non-static data members and direct or virtual bases 8200/// of class \p ClassDecl have either a move operation, or are trivially 8201/// copyable. 8202static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl, 8203 bool IsConstructor) { 8204 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8205 BaseEnd = ClassDecl->bases_end(); 8206 Base != BaseEnd; ++Base) { 8207 if (Base->isVirtual()) 8208 continue; 8209 8210 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8211 return false; 8212 } 8213 8214 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8215 BaseEnd = ClassDecl->vbases_end(); 8216 Base != BaseEnd; ++Base) { 8217 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8218 return false; 8219 } 8220 8221 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8222 FieldEnd = ClassDecl->field_end(); 8223 Field != FieldEnd; ++Field) { 8224 if (!hasMoveOrIsTriviallyCopyable(S, Field->getType(), IsConstructor)) 8225 return false; 8226 } 8227 8228 return true; 8229} 8230 8231CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8232 // C++11 [class.copy]p20: 8233 // If the definition of a class X does not explicitly declare a move 8234 // assignment operator, one will be implicitly declared as defaulted 8235 // if and only if: 8236 // 8237 // - [first 4 bullets] 8238 assert(ClassDecl->needsImplicitMoveAssignment()); 8239 8240 // [Checked after we build the declaration] 8241 // - the move assignment operator would not be implicitly defined as 8242 // deleted, 8243 8244 // [DR1402]: 8245 // - X has no direct or indirect virtual base class with a non-trivial 8246 // move assignment operator, and 8247 // - each of X's non-static data members and direct or virtual base classes 8248 // has a type that either has a move assignment operator or is trivially 8249 // copyable. 8250 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) || 8251 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) { 8252 ClassDecl->setFailedImplicitMoveAssignment(); 8253 return 0; 8254 } 8255 8256 // Note: The following rules are largely analoguous to the move 8257 // constructor rules. 8258 8259 ImplicitExceptionSpecification Spec( 8260 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 8261 8262 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8263 QualType RetType = Context.getLValueReferenceType(ArgType); 8264 ArgType = Context.getRValueReferenceType(ArgType); 8265 8266 // An implicitly-declared move assignment operator is an inline public 8267 // member of its class. 8268 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8269 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8270 SourceLocation ClassLoc = ClassDecl->getLocation(); 8271 DeclarationNameInfo NameInfo(Name, ClassLoc); 8272 CXXMethodDecl *MoveAssignment 8273 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8274 Context.getFunctionType(RetType, &ArgType, 1, EPI), 8275 /*TInfo=*/0, /*isStatic=*/false, 8276 /*StorageClassAsWritten=*/SC_None, 8277 /*isInline=*/true, 8278 /*isConstexpr=*/false, 8279 SourceLocation()); 8280 MoveAssignment->setAccess(AS_public); 8281 MoveAssignment->setDefaulted(); 8282 MoveAssignment->setImplicit(); 8283 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8284 8285 // Add the parameter to the operator. 8286 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8287 ClassLoc, ClassLoc, /*Id=*/0, 8288 ArgType, /*TInfo=*/0, 8289 SC_None, 8290 SC_None, 0); 8291 MoveAssignment->setParams(FromParam); 8292 8293 // Note that we have added this copy-assignment operator. 8294 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8295 8296 // C++0x [class.copy]p9: 8297 // If the definition of a class X does not explicitly declare a move 8298 // assignment operator, one will be implicitly declared as defaulted if and 8299 // only if: 8300 // [...] 8301 // - the move assignment operator would not be implicitly defined as 8302 // deleted. 8303 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 8304 // Cache this result so that we don't try to generate this over and over 8305 // on every lookup, leaking memory and wasting time. 8306 ClassDecl->setFailedImplicitMoveAssignment(); 8307 return 0; 8308 } 8309 8310 if (Scope *S = getScopeForContext(ClassDecl)) 8311 PushOnScopeChains(MoveAssignment, S, false); 8312 ClassDecl->addDecl(MoveAssignment); 8313 8314 AddOverriddenMethods(ClassDecl, MoveAssignment); 8315 return MoveAssignment; 8316} 8317 8318void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8319 CXXMethodDecl *MoveAssignOperator) { 8320 assert((MoveAssignOperator->isDefaulted() && 8321 MoveAssignOperator->isOverloadedOperator() && 8322 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8323 !MoveAssignOperator->doesThisDeclarationHaveABody() && 8324 !MoveAssignOperator->isDeleted()) && 8325 "DefineImplicitMoveAssignment called for wrong function"); 8326 8327 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8328 8329 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8330 MoveAssignOperator->setInvalidDecl(); 8331 return; 8332 } 8333 8334 MoveAssignOperator->setUsed(); 8335 8336 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8337 DiagnosticErrorTrap Trap(Diags); 8338 8339 // C++0x [class.copy]p28: 8340 // The implicitly-defined or move assignment operator for a non-union class 8341 // X performs memberwise move assignment of its subobjects. The direct base 8342 // classes of X are assigned first, in the order of their declaration in the 8343 // base-specifier-list, and then the immediate non-static data members of X 8344 // are assigned, in the order in which they were declared in the class 8345 // definition. 8346 8347 // The statements that form the synthesized function body. 8348 ASTOwningVector<Stmt*> Statements(*this); 8349 8350 // The parameter for the "other" object, which we are move from. 8351 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8352 QualType OtherRefType = Other->getType()-> 8353 getAs<RValueReferenceType>()->getPointeeType(); 8354 assert(OtherRefType.getQualifiers() == 0 && 8355 "Bad argument type of defaulted move assignment"); 8356 8357 // Our location for everything implicitly-generated. 8358 SourceLocation Loc = MoveAssignOperator->getLocation(); 8359 8360 // Construct a reference to the "other" object. We'll be using this 8361 // throughout the generated ASTs. 8362 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8363 assert(OtherRef && "Reference to parameter cannot fail!"); 8364 // Cast to rvalue. 8365 OtherRef = CastForMoving(*this, OtherRef); 8366 8367 // Construct the "this" pointer. We'll be using this throughout the generated 8368 // ASTs. 8369 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8370 assert(This && "Reference to this cannot fail!"); 8371 8372 // Assign base classes. 8373 bool Invalid = false; 8374 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8375 E = ClassDecl->bases_end(); Base != E; ++Base) { 8376 // Form the assignment: 8377 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8378 QualType BaseType = Base->getType().getUnqualifiedType(); 8379 if (!BaseType->isRecordType()) { 8380 Invalid = true; 8381 continue; 8382 } 8383 8384 CXXCastPath BasePath; 8385 BasePath.push_back(Base); 8386 8387 // Construct the "from" expression, which is an implicit cast to the 8388 // appropriately-qualified base type. 8389 Expr *From = OtherRef; 8390 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8391 VK_XValue, &BasePath).take(); 8392 8393 // Dereference "this". 8394 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8395 8396 // Implicitly cast "this" to the appropriately-qualified base type. 8397 To = ImpCastExprToType(To.take(), 8398 Context.getCVRQualifiedType(BaseType, 8399 MoveAssignOperator->getTypeQualifiers()), 8400 CK_UncheckedDerivedToBase, 8401 VK_LValue, &BasePath); 8402 8403 // Build the move. 8404 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8405 To.get(), From, 8406 /*CopyingBaseSubobject=*/true, 8407 /*Copying=*/false); 8408 if (Move.isInvalid()) { 8409 Diag(CurrentLocation, diag::note_member_synthesized_at) 8410 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8411 MoveAssignOperator->setInvalidDecl(); 8412 return; 8413 } 8414 8415 // Success! Record the move. 8416 Statements.push_back(Move.takeAs<Expr>()); 8417 } 8418 8419 // \brief Reference to the __builtin_memcpy function. 8420 Expr *BuiltinMemCpyRef = 0; 8421 // \brief Reference to the __builtin_objc_memmove_collectable function. 8422 Expr *CollectableMemCpyRef = 0; 8423 8424 // Assign non-static members. 8425 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8426 FieldEnd = ClassDecl->field_end(); 8427 Field != FieldEnd; ++Field) { 8428 if (Field->isUnnamedBitfield()) 8429 continue; 8430 8431 // Check for members of reference type; we can't move those. 8432 if (Field->getType()->isReferenceType()) { 8433 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8434 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8435 Diag(Field->getLocation(), diag::note_declared_at); 8436 Diag(CurrentLocation, diag::note_member_synthesized_at) 8437 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8438 Invalid = true; 8439 continue; 8440 } 8441 8442 // Check for members of const-qualified, non-class type. 8443 QualType BaseType = Context.getBaseElementType(Field->getType()); 8444 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8445 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8446 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8447 Diag(Field->getLocation(), diag::note_declared_at); 8448 Diag(CurrentLocation, diag::note_member_synthesized_at) 8449 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8450 Invalid = true; 8451 continue; 8452 } 8453 8454 // Suppress assigning zero-width bitfields. 8455 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8456 continue; 8457 8458 QualType FieldType = Field->getType().getNonReferenceType(); 8459 if (FieldType->isIncompleteArrayType()) { 8460 assert(ClassDecl->hasFlexibleArrayMember() && 8461 "Incomplete array type is not valid"); 8462 continue; 8463 } 8464 8465 // Build references to the field in the object we're copying from and to. 8466 CXXScopeSpec SS; // Intentionally empty 8467 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8468 LookupMemberName); 8469 MemberLookup.addDecl(&*Field); 8470 MemberLookup.resolveKind(); 8471 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8472 Loc, /*IsArrow=*/false, 8473 SS, SourceLocation(), 0, 8474 MemberLookup, 0); 8475 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8476 Loc, /*IsArrow=*/true, 8477 SS, SourceLocation(), 0, 8478 MemberLookup, 0); 8479 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8480 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8481 8482 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8483 "Member reference with rvalue base must be rvalue except for reference " 8484 "members, which aren't allowed for move assignment."); 8485 8486 // If the field should be copied with __builtin_memcpy rather than via 8487 // explicit assignments, do so. This optimization only applies for arrays 8488 // of scalars and arrays of class type with trivial move-assignment 8489 // operators. 8490 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8491 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8492 // Compute the size of the memory buffer to be copied. 8493 QualType SizeType = Context.getSizeType(); 8494 llvm::APInt Size(Context.getTypeSize(SizeType), 8495 Context.getTypeSizeInChars(BaseType).getQuantity()); 8496 for (const ConstantArrayType *Array 8497 = Context.getAsConstantArrayType(FieldType); 8498 Array; 8499 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8500 llvm::APInt ArraySize 8501 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8502 Size *= ArraySize; 8503 } 8504 8505 // Take the address of the field references for "from" and "to". We 8506 // directly construct UnaryOperators here because semantic analysis 8507 // does not permit us to take the address of an xvalue. 8508 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8509 Context.getPointerType(From.get()->getType()), 8510 VK_RValue, OK_Ordinary, Loc); 8511 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8512 Context.getPointerType(To.get()->getType()), 8513 VK_RValue, OK_Ordinary, Loc); 8514 8515 bool NeedsCollectableMemCpy = 8516 (BaseType->isRecordType() && 8517 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8518 8519 if (NeedsCollectableMemCpy) { 8520 if (!CollectableMemCpyRef) { 8521 // Create a reference to the __builtin_objc_memmove_collectable function. 8522 LookupResult R(*this, 8523 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8524 Loc, LookupOrdinaryName); 8525 LookupName(R, TUScope, true); 8526 8527 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8528 if (!CollectableMemCpy) { 8529 // Something went horribly wrong earlier, and we will have 8530 // complained about it. 8531 Invalid = true; 8532 continue; 8533 } 8534 8535 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8536 CollectableMemCpy->getType(), 8537 VK_LValue, Loc, 0).take(); 8538 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8539 } 8540 } 8541 // Create a reference to the __builtin_memcpy builtin function. 8542 else if (!BuiltinMemCpyRef) { 8543 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8544 LookupOrdinaryName); 8545 LookupName(R, TUScope, true); 8546 8547 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8548 if (!BuiltinMemCpy) { 8549 // Something went horribly wrong earlier, and we will have complained 8550 // about it. 8551 Invalid = true; 8552 continue; 8553 } 8554 8555 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8556 BuiltinMemCpy->getType(), 8557 VK_LValue, Loc, 0).take(); 8558 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8559 } 8560 8561 ASTOwningVector<Expr*> CallArgs(*this); 8562 CallArgs.push_back(To.takeAs<Expr>()); 8563 CallArgs.push_back(From.takeAs<Expr>()); 8564 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8565 ExprResult Call = ExprError(); 8566 if (NeedsCollectableMemCpy) 8567 Call = ActOnCallExpr(/*Scope=*/0, 8568 CollectableMemCpyRef, 8569 Loc, move_arg(CallArgs), 8570 Loc); 8571 else 8572 Call = ActOnCallExpr(/*Scope=*/0, 8573 BuiltinMemCpyRef, 8574 Loc, move_arg(CallArgs), 8575 Loc); 8576 8577 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8578 Statements.push_back(Call.takeAs<Expr>()); 8579 continue; 8580 } 8581 8582 // Build the move of this field. 8583 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8584 To.get(), From.get(), 8585 /*CopyingBaseSubobject=*/false, 8586 /*Copying=*/false); 8587 if (Move.isInvalid()) { 8588 Diag(CurrentLocation, diag::note_member_synthesized_at) 8589 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8590 MoveAssignOperator->setInvalidDecl(); 8591 return; 8592 } 8593 8594 // Success! Record the copy. 8595 Statements.push_back(Move.takeAs<Stmt>()); 8596 } 8597 8598 if (!Invalid) { 8599 // Add a "return *this;" 8600 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8601 8602 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8603 if (Return.isInvalid()) 8604 Invalid = true; 8605 else { 8606 Statements.push_back(Return.takeAs<Stmt>()); 8607 8608 if (Trap.hasErrorOccurred()) { 8609 Diag(CurrentLocation, diag::note_member_synthesized_at) 8610 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8611 Invalid = true; 8612 } 8613 } 8614 } 8615 8616 if (Invalid) { 8617 MoveAssignOperator->setInvalidDecl(); 8618 return; 8619 } 8620 8621 StmtResult Body; 8622 { 8623 CompoundScopeRAII CompoundScope(*this); 8624 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8625 /*isStmtExpr=*/false); 8626 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8627 } 8628 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8629 8630 if (ASTMutationListener *L = getASTMutationListener()) { 8631 L->CompletedImplicitDefinition(MoveAssignOperator); 8632 } 8633} 8634 8635std::pair<Sema::ImplicitExceptionSpecification, bool> 8636Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8637 if (ClassDecl->isInvalidDecl()) 8638 return std::make_pair(ImplicitExceptionSpecification(*this), false); 8639 8640 // C++ [class.copy]p5: 8641 // The implicitly-declared copy constructor for a class X will 8642 // have the form 8643 // 8644 // X::X(const X&) 8645 // 8646 // if 8647 // FIXME: It ought to be possible to store this on the record. 8648 bool HasConstCopyConstructor = true; 8649 8650 // -- each direct or virtual base class B of X has a copy 8651 // constructor whose first parameter is of type const B& or 8652 // const volatile B&, and 8653 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8654 BaseEnd = ClassDecl->bases_end(); 8655 HasConstCopyConstructor && Base != BaseEnd; 8656 ++Base) { 8657 // Virtual bases are handled below. 8658 if (Base->isVirtual()) 8659 continue; 8660 8661 CXXRecordDecl *BaseClassDecl 8662 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8663 HasConstCopyConstructor &= 8664 (bool)LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const); 8665 } 8666 8667 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8668 BaseEnd = ClassDecl->vbases_end(); 8669 HasConstCopyConstructor && Base != BaseEnd; 8670 ++Base) { 8671 CXXRecordDecl *BaseClassDecl 8672 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8673 HasConstCopyConstructor &= 8674 (bool)LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const); 8675 } 8676 8677 // -- for all the nonstatic data members of X that are of a 8678 // class type M (or array thereof), each such class type 8679 // has a copy constructor whose first parameter is of type 8680 // const M& or const volatile M&. 8681 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8682 FieldEnd = ClassDecl->field_end(); 8683 HasConstCopyConstructor && Field != FieldEnd; 8684 ++Field) { 8685 QualType FieldType = Context.getBaseElementType(Field->getType()); 8686 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8687 HasConstCopyConstructor &= 8688 (bool)LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const); 8689 } 8690 } 8691 // Otherwise, the implicitly declared copy constructor will have 8692 // the form 8693 // 8694 // X::X(X&) 8695 8696 // C++ [except.spec]p14: 8697 // An implicitly declared special member function (Clause 12) shall have an 8698 // exception-specification. [...] 8699 ImplicitExceptionSpecification ExceptSpec(*this); 8700 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8701 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8702 BaseEnd = ClassDecl->bases_end(); 8703 Base != BaseEnd; 8704 ++Base) { 8705 // Virtual bases are handled below. 8706 if (Base->isVirtual()) 8707 continue; 8708 8709 CXXRecordDecl *BaseClassDecl 8710 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8711 if (CXXConstructorDecl *CopyConstructor = 8712 LookupCopyingConstructor(BaseClassDecl, Quals)) 8713 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8714 } 8715 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8716 BaseEnd = ClassDecl->vbases_end(); 8717 Base != BaseEnd; 8718 ++Base) { 8719 CXXRecordDecl *BaseClassDecl 8720 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8721 if (CXXConstructorDecl *CopyConstructor = 8722 LookupCopyingConstructor(BaseClassDecl, Quals)) 8723 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8724 } 8725 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8726 FieldEnd = ClassDecl->field_end(); 8727 Field != FieldEnd; 8728 ++Field) { 8729 QualType FieldType = Context.getBaseElementType(Field->getType()); 8730 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8731 if (CXXConstructorDecl *CopyConstructor = 8732 LookupCopyingConstructor(FieldClassDecl, Quals)) 8733 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor); 8734 } 8735 } 8736 8737 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8738} 8739 8740CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8741 CXXRecordDecl *ClassDecl) { 8742 // C++ [class.copy]p4: 8743 // If the class definition does not explicitly declare a copy 8744 // constructor, one is declared implicitly. 8745 8746 ImplicitExceptionSpecification Spec(*this); 8747 bool Const; 8748 llvm::tie(Spec, Const) = 8749 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8750 8751 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8752 QualType ArgType = ClassType; 8753 if (Const) 8754 ArgType = ArgType.withConst(); 8755 ArgType = Context.getLValueReferenceType(ArgType); 8756 8757 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8758 8759 DeclarationName Name 8760 = Context.DeclarationNames.getCXXConstructorName( 8761 Context.getCanonicalType(ClassType)); 8762 SourceLocation ClassLoc = ClassDecl->getLocation(); 8763 DeclarationNameInfo NameInfo(Name, ClassLoc); 8764 8765 // An implicitly-declared copy constructor is an inline public 8766 // member of its class. 8767 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8768 Context, ClassDecl, ClassLoc, NameInfo, 8769 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8770 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8771 /*isConstexpr=*/ClassDecl->defaultedCopyConstructorIsConstexpr() && 8772 getLangOpts().CPlusPlus0x); 8773 CopyConstructor->setAccess(AS_public); 8774 CopyConstructor->setDefaulted(); 8775 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8776 8777 // Note that we have declared this constructor. 8778 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8779 8780 // Add the parameter to the constructor. 8781 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8782 ClassLoc, ClassLoc, 8783 /*IdentifierInfo=*/0, 8784 ArgType, /*TInfo=*/0, 8785 SC_None, 8786 SC_None, 0); 8787 CopyConstructor->setParams(FromParam); 8788 8789 if (Scope *S = getScopeForContext(ClassDecl)) 8790 PushOnScopeChains(CopyConstructor, S, false); 8791 ClassDecl->addDecl(CopyConstructor); 8792 8793 // C++11 [class.copy]p8: 8794 // ... If the class definition does not explicitly declare a copy 8795 // constructor, there is no user-declared move constructor, and there is no 8796 // user-declared move assignment operator, a copy constructor is implicitly 8797 // declared as defaulted. 8798 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8799 CopyConstructor->setDeletedAsWritten(); 8800 8801 return CopyConstructor; 8802} 8803 8804void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8805 CXXConstructorDecl *CopyConstructor) { 8806 assert((CopyConstructor->isDefaulted() && 8807 CopyConstructor->isCopyConstructor() && 8808 !CopyConstructor->doesThisDeclarationHaveABody() && 8809 !CopyConstructor->isDeleted()) && 8810 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8811 8812 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8813 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8814 8815 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8816 DiagnosticErrorTrap Trap(Diags); 8817 8818 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8819 Trap.hasErrorOccurred()) { 8820 Diag(CurrentLocation, diag::note_member_synthesized_at) 8821 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8822 CopyConstructor->setInvalidDecl(); 8823 } else { 8824 Sema::CompoundScopeRAII CompoundScope(*this); 8825 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8826 CopyConstructor->getLocation(), 8827 MultiStmtArg(*this, 0, 0), 8828 /*isStmtExpr=*/false) 8829 .takeAs<Stmt>()); 8830 CopyConstructor->setImplicitlyDefined(true); 8831 } 8832 8833 CopyConstructor->setUsed(); 8834 if (ASTMutationListener *L = getASTMutationListener()) { 8835 L->CompletedImplicitDefinition(CopyConstructor); 8836 } 8837} 8838 8839Sema::ImplicitExceptionSpecification 8840Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8841 // C++ [except.spec]p14: 8842 // An implicitly declared special member function (Clause 12) shall have an 8843 // exception-specification. [...] 8844 ImplicitExceptionSpecification ExceptSpec(*this); 8845 if (ClassDecl->isInvalidDecl()) 8846 return ExceptSpec; 8847 8848 // Direct base-class constructors. 8849 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8850 BEnd = ClassDecl->bases_end(); 8851 B != BEnd; ++B) { 8852 if (B->isVirtual()) // Handled below. 8853 continue; 8854 8855 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8856 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8857 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8858 // If this is a deleted function, add it anyway. This might be conformant 8859 // with the standard. This might not. I'm not sure. It might not matter. 8860 if (Constructor) 8861 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8862 } 8863 } 8864 8865 // Virtual base-class constructors. 8866 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8867 BEnd = ClassDecl->vbases_end(); 8868 B != BEnd; ++B) { 8869 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8870 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8871 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8872 // If this is a deleted function, add it anyway. This might be conformant 8873 // with the standard. This might not. I'm not sure. It might not matter. 8874 if (Constructor) 8875 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8876 } 8877 } 8878 8879 // Field constructors. 8880 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8881 FEnd = ClassDecl->field_end(); 8882 F != FEnd; ++F) { 8883 if (const RecordType *RecordTy 8884 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8885 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8886 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8887 // If this is a deleted function, add it anyway. This might be conformant 8888 // with the standard. This might not. I'm not sure. It might not matter. 8889 // In particular, the problem is that this function never gets called. It 8890 // might just be ill-formed because this function attempts to refer to 8891 // a deleted function here. 8892 if (Constructor) 8893 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 8894 } 8895 } 8896 8897 return ExceptSpec; 8898} 8899 8900CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8901 CXXRecordDecl *ClassDecl) { 8902 // C++11 [class.copy]p9: 8903 // If the definition of a class X does not explicitly declare a move 8904 // constructor, one will be implicitly declared as defaulted if and only if: 8905 // 8906 // - [first 4 bullets] 8907 assert(ClassDecl->needsImplicitMoveConstructor()); 8908 8909 // [Checked after we build the declaration] 8910 // - the move assignment operator would not be implicitly defined as 8911 // deleted, 8912 8913 // [DR1402]: 8914 // - each of X's non-static data members and direct or virtual base classes 8915 // has a type that either has a move constructor or is trivially copyable. 8916 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) { 8917 ClassDecl->setFailedImplicitMoveConstructor(); 8918 return 0; 8919 } 8920 8921 ImplicitExceptionSpecification Spec( 8922 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8923 8924 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8925 QualType ArgType = Context.getRValueReferenceType(ClassType); 8926 8927 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8928 8929 DeclarationName Name 8930 = Context.DeclarationNames.getCXXConstructorName( 8931 Context.getCanonicalType(ClassType)); 8932 SourceLocation ClassLoc = ClassDecl->getLocation(); 8933 DeclarationNameInfo NameInfo(Name, ClassLoc); 8934 8935 // C++0x [class.copy]p11: 8936 // An implicitly-declared copy/move constructor is an inline public 8937 // member of its class. 8938 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8939 Context, ClassDecl, ClassLoc, NameInfo, 8940 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8941 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8942 /*isConstexpr=*/ClassDecl->defaultedMoveConstructorIsConstexpr() && 8943 getLangOpts().CPlusPlus0x); 8944 MoveConstructor->setAccess(AS_public); 8945 MoveConstructor->setDefaulted(); 8946 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8947 8948 // Add the parameter to the constructor. 8949 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8950 ClassLoc, ClassLoc, 8951 /*IdentifierInfo=*/0, 8952 ArgType, /*TInfo=*/0, 8953 SC_None, 8954 SC_None, 0); 8955 MoveConstructor->setParams(FromParam); 8956 8957 // C++0x [class.copy]p9: 8958 // If the definition of a class X does not explicitly declare a move 8959 // constructor, one will be implicitly declared as defaulted if and only if: 8960 // [...] 8961 // - the move constructor would not be implicitly defined as deleted. 8962 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8963 // Cache this result so that we don't try to generate this over and over 8964 // on every lookup, leaking memory and wasting time. 8965 ClassDecl->setFailedImplicitMoveConstructor(); 8966 return 0; 8967 } 8968 8969 // Note that we have declared this constructor. 8970 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8971 8972 if (Scope *S = getScopeForContext(ClassDecl)) 8973 PushOnScopeChains(MoveConstructor, S, false); 8974 ClassDecl->addDecl(MoveConstructor); 8975 8976 return MoveConstructor; 8977} 8978 8979void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8980 CXXConstructorDecl *MoveConstructor) { 8981 assert((MoveConstructor->isDefaulted() && 8982 MoveConstructor->isMoveConstructor() && 8983 !MoveConstructor->doesThisDeclarationHaveABody() && 8984 !MoveConstructor->isDeleted()) && 8985 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8986 8987 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8988 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8989 8990 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8991 DiagnosticErrorTrap Trap(Diags); 8992 8993 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8994 Trap.hasErrorOccurred()) { 8995 Diag(CurrentLocation, diag::note_member_synthesized_at) 8996 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8997 MoveConstructor->setInvalidDecl(); 8998 } else { 8999 Sema::CompoundScopeRAII CompoundScope(*this); 9000 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 9001 MoveConstructor->getLocation(), 9002 MultiStmtArg(*this, 0, 0), 9003 /*isStmtExpr=*/false) 9004 .takeAs<Stmt>()); 9005 MoveConstructor->setImplicitlyDefined(true); 9006 } 9007 9008 MoveConstructor->setUsed(); 9009 9010 if (ASTMutationListener *L = getASTMutationListener()) { 9011 L->CompletedImplicitDefinition(MoveConstructor); 9012 } 9013} 9014 9015bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 9016 return FD->isDeleted() && 9017 (FD->isDefaulted() || FD->isImplicit()) && 9018 isa<CXXMethodDecl>(FD); 9019} 9020 9021/// \brief Mark the call operator of the given lambda closure type as "used". 9022static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 9023 CXXMethodDecl *CallOperator 9024 = cast<CXXMethodDecl>( 9025 *Lambda->lookup( 9026 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).first); 9027 CallOperator->setReferenced(); 9028 CallOperator->setUsed(); 9029} 9030 9031void Sema::DefineImplicitLambdaToFunctionPointerConversion( 9032 SourceLocation CurrentLocation, 9033 CXXConversionDecl *Conv) 9034{ 9035 CXXRecordDecl *Lambda = Conv->getParent(); 9036 9037 // Make sure that the lambda call operator is marked used. 9038 markLambdaCallOperatorUsed(*this, Lambda); 9039 9040 Conv->setUsed(); 9041 9042 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 9043 DiagnosticErrorTrap Trap(Diags); 9044 9045 // Return the address of the __invoke function. 9046 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 9047 CXXMethodDecl *Invoke 9048 = cast<CXXMethodDecl>(*Lambda->lookup(InvokeName).first); 9049 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 9050 VK_LValue, Conv->getLocation()).take(); 9051 assert(FunctionRef && "Can't refer to __invoke function?"); 9052 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 9053 Conv->setBody(new (Context) CompoundStmt(Context, &Return, 1, 9054 Conv->getLocation(), 9055 Conv->getLocation())); 9056 9057 // Fill in the __invoke function with a dummy implementation. IR generation 9058 // will fill in the actual details. 9059 Invoke->setUsed(); 9060 Invoke->setReferenced(); 9061 Invoke->setBody(new (Context) CompoundStmt(Context, 0, 0, Conv->getLocation(), 9062 Conv->getLocation())); 9063 9064 if (ASTMutationListener *L = getASTMutationListener()) { 9065 L->CompletedImplicitDefinition(Conv); 9066 L->CompletedImplicitDefinition(Invoke); 9067 } 9068} 9069 9070void Sema::DefineImplicitLambdaToBlockPointerConversion( 9071 SourceLocation CurrentLocation, 9072 CXXConversionDecl *Conv) 9073{ 9074 Conv->setUsed(); 9075 9076 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 9077 DiagnosticErrorTrap Trap(Diags); 9078 9079 // Copy-initialize the lambda object as needed to capture it. 9080 Expr *This = ActOnCXXThis(CurrentLocation).take(); 9081 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 9082 9083 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 9084 Conv->getLocation(), 9085 Conv, DerefThis); 9086 9087 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 9088 // behavior. Note that only the general conversion function does this 9089 // (since it's unusable otherwise); in the case where we inline the 9090 // block literal, it has block literal lifetime semantics. 9091 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 9092 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 9093 CK_CopyAndAutoreleaseBlockObject, 9094 BuildBlock.get(), 0, VK_RValue); 9095 9096 if (BuildBlock.isInvalid()) { 9097 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9098 Conv->setInvalidDecl(); 9099 return; 9100 } 9101 9102 // Create the return statement that returns the block from the conversion 9103 // function. 9104 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 9105 if (Return.isInvalid()) { 9106 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9107 Conv->setInvalidDecl(); 9108 return; 9109 } 9110 9111 // Set the body of the conversion function. 9112 Stmt *ReturnS = Return.take(); 9113 Conv->setBody(new (Context) CompoundStmt(Context, &ReturnS, 1, 9114 Conv->getLocation(), 9115 Conv->getLocation())); 9116 9117 // We're done; notify the mutation listener, if any. 9118 if (ASTMutationListener *L = getASTMutationListener()) { 9119 L->CompletedImplicitDefinition(Conv); 9120 } 9121} 9122 9123/// \brief Determine whether the given list arguments contains exactly one 9124/// "real" (non-default) argument. 9125static bool hasOneRealArgument(MultiExprArg Args) { 9126 switch (Args.size()) { 9127 case 0: 9128 return false; 9129 9130 default: 9131 if (!Args.get()[1]->isDefaultArgument()) 9132 return false; 9133 9134 // fall through 9135 case 1: 9136 return !Args.get()[0]->isDefaultArgument(); 9137 } 9138 9139 return false; 9140} 9141 9142ExprResult 9143Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9144 CXXConstructorDecl *Constructor, 9145 MultiExprArg ExprArgs, 9146 bool HadMultipleCandidates, 9147 bool RequiresZeroInit, 9148 unsigned ConstructKind, 9149 SourceRange ParenRange) { 9150 bool Elidable = false; 9151 9152 // C++0x [class.copy]p34: 9153 // When certain criteria are met, an implementation is allowed to 9154 // omit the copy/move construction of a class object, even if the 9155 // copy/move constructor and/or destructor for the object have 9156 // side effects. [...] 9157 // - when a temporary class object that has not been bound to a 9158 // reference (12.2) would be copied/moved to a class object 9159 // with the same cv-unqualified type, the copy/move operation 9160 // can be omitted by constructing the temporary object 9161 // directly into the target of the omitted copy/move 9162 if (ConstructKind == CXXConstructExpr::CK_Complete && 9163 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 9164 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 9165 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 9166 } 9167 9168 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 9169 Elidable, move(ExprArgs), HadMultipleCandidates, 9170 RequiresZeroInit, ConstructKind, ParenRange); 9171} 9172 9173/// BuildCXXConstructExpr - Creates a complete call to a constructor, 9174/// including handling of its default argument expressions. 9175ExprResult 9176Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9177 CXXConstructorDecl *Constructor, bool Elidable, 9178 MultiExprArg ExprArgs, 9179 bool HadMultipleCandidates, 9180 bool RequiresZeroInit, 9181 unsigned ConstructKind, 9182 SourceRange ParenRange) { 9183 unsigned NumExprs = ExprArgs.size(); 9184 Expr **Exprs = (Expr **)ExprArgs.release(); 9185 9186 for (specific_attr_iterator<NonNullAttr> 9187 i = Constructor->specific_attr_begin<NonNullAttr>(), 9188 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 9189 const NonNullAttr *NonNull = *i; 9190 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 9191 } 9192 9193 MarkFunctionReferenced(ConstructLoc, Constructor); 9194 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 9195 Constructor, Elidable, Exprs, NumExprs, 9196 HadMultipleCandidates, /*FIXME*/false, 9197 RequiresZeroInit, 9198 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 9199 ParenRange)); 9200} 9201 9202bool Sema::InitializeVarWithConstructor(VarDecl *VD, 9203 CXXConstructorDecl *Constructor, 9204 MultiExprArg Exprs, 9205 bool HadMultipleCandidates) { 9206 // FIXME: Provide the correct paren SourceRange when available. 9207 ExprResult TempResult = 9208 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 9209 move(Exprs), HadMultipleCandidates, false, 9210 CXXConstructExpr::CK_Complete, SourceRange()); 9211 if (TempResult.isInvalid()) 9212 return true; 9213 9214 Expr *Temp = TempResult.takeAs<Expr>(); 9215 CheckImplicitConversions(Temp, VD->getLocation()); 9216 MarkFunctionReferenced(VD->getLocation(), Constructor); 9217 Temp = MaybeCreateExprWithCleanups(Temp); 9218 VD->setInit(Temp); 9219 9220 return false; 9221} 9222 9223void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9224 if (VD->isInvalidDecl()) return; 9225 9226 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9227 if (ClassDecl->isInvalidDecl()) return; 9228 if (ClassDecl->hasIrrelevantDestructor()) return; 9229 if (ClassDecl->isDependentContext()) return; 9230 9231 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9232 MarkFunctionReferenced(VD->getLocation(), Destructor); 9233 CheckDestructorAccess(VD->getLocation(), Destructor, 9234 PDiag(diag::err_access_dtor_var) 9235 << VD->getDeclName() 9236 << VD->getType()); 9237 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 9238 9239 if (!VD->hasGlobalStorage()) return; 9240 9241 // Emit warning for non-trivial dtor in global scope (a real global, 9242 // class-static, function-static). 9243 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9244 9245 // TODO: this should be re-enabled for static locals by !CXAAtExit 9246 if (!VD->isStaticLocal()) 9247 Diag(VD->getLocation(), diag::warn_global_destructor); 9248} 9249 9250/// \brief Given a constructor and the set of arguments provided for the 9251/// constructor, convert the arguments and add any required default arguments 9252/// to form a proper call to this constructor. 9253/// 9254/// \returns true if an error occurred, false otherwise. 9255bool 9256Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9257 MultiExprArg ArgsPtr, 9258 SourceLocation Loc, 9259 ASTOwningVector<Expr*> &ConvertedArgs, 9260 bool AllowExplicit) { 9261 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9262 unsigned NumArgs = ArgsPtr.size(); 9263 Expr **Args = (Expr **)ArgsPtr.get(); 9264 9265 const FunctionProtoType *Proto 9266 = Constructor->getType()->getAs<FunctionProtoType>(); 9267 assert(Proto && "Constructor without a prototype?"); 9268 unsigned NumArgsInProto = Proto->getNumArgs(); 9269 9270 // If too few arguments are available, we'll fill in the rest with defaults. 9271 if (NumArgs < NumArgsInProto) 9272 ConvertedArgs.reserve(NumArgsInProto); 9273 else 9274 ConvertedArgs.reserve(NumArgs); 9275 9276 VariadicCallType CallType = 9277 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9278 SmallVector<Expr *, 8> AllArgs; 9279 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9280 Proto, 0, Args, NumArgs, AllArgs, 9281 CallType, AllowExplicit); 9282 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 9283 9284 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size()); 9285 9286 // FIXME: Missing call to CheckFunctionCall or equivalent 9287 9288 return Invalid; 9289} 9290 9291static inline bool 9292CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9293 const FunctionDecl *FnDecl) { 9294 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9295 if (isa<NamespaceDecl>(DC)) { 9296 return SemaRef.Diag(FnDecl->getLocation(), 9297 diag::err_operator_new_delete_declared_in_namespace) 9298 << FnDecl->getDeclName(); 9299 } 9300 9301 if (isa<TranslationUnitDecl>(DC) && 9302 FnDecl->getStorageClass() == SC_Static) { 9303 return SemaRef.Diag(FnDecl->getLocation(), 9304 diag::err_operator_new_delete_declared_static) 9305 << FnDecl->getDeclName(); 9306 } 9307 9308 return false; 9309} 9310 9311static inline bool 9312CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9313 CanQualType ExpectedResultType, 9314 CanQualType ExpectedFirstParamType, 9315 unsigned DependentParamTypeDiag, 9316 unsigned InvalidParamTypeDiag) { 9317 QualType ResultType = 9318 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9319 9320 // Check that the result type is not dependent. 9321 if (ResultType->isDependentType()) 9322 return SemaRef.Diag(FnDecl->getLocation(), 9323 diag::err_operator_new_delete_dependent_result_type) 9324 << FnDecl->getDeclName() << ExpectedResultType; 9325 9326 // Check that the result type is what we expect. 9327 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9328 return SemaRef.Diag(FnDecl->getLocation(), 9329 diag::err_operator_new_delete_invalid_result_type) 9330 << FnDecl->getDeclName() << ExpectedResultType; 9331 9332 // A function template must have at least 2 parameters. 9333 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9334 return SemaRef.Diag(FnDecl->getLocation(), 9335 diag::err_operator_new_delete_template_too_few_parameters) 9336 << FnDecl->getDeclName(); 9337 9338 // The function decl must have at least 1 parameter. 9339 if (FnDecl->getNumParams() == 0) 9340 return SemaRef.Diag(FnDecl->getLocation(), 9341 diag::err_operator_new_delete_too_few_parameters) 9342 << FnDecl->getDeclName(); 9343 9344 // Check the the first parameter type is not dependent. 9345 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9346 if (FirstParamType->isDependentType()) 9347 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9348 << FnDecl->getDeclName() << ExpectedFirstParamType; 9349 9350 // Check that the first parameter type is what we expect. 9351 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9352 ExpectedFirstParamType) 9353 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9354 << FnDecl->getDeclName() << ExpectedFirstParamType; 9355 9356 return false; 9357} 9358 9359static bool 9360CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9361 // C++ [basic.stc.dynamic.allocation]p1: 9362 // A program is ill-formed if an allocation function is declared in a 9363 // namespace scope other than global scope or declared static in global 9364 // scope. 9365 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9366 return true; 9367 9368 CanQualType SizeTy = 9369 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9370 9371 // C++ [basic.stc.dynamic.allocation]p1: 9372 // The return type shall be void*. The first parameter shall have type 9373 // std::size_t. 9374 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9375 SizeTy, 9376 diag::err_operator_new_dependent_param_type, 9377 diag::err_operator_new_param_type)) 9378 return true; 9379 9380 // C++ [basic.stc.dynamic.allocation]p1: 9381 // The first parameter shall not have an associated default argument. 9382 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9383 return SemaRef.Diag(FnDecl->getLocation(), 9384 diag::err_operator_new_default_arg) 9385 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9386 9387 return false; 9388} 9389 9390static bool 9391CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9392 // C++ [basic.stc.dynamic.deallocation]p1: 9393 // A program is ill-formed if deallocation functions are declared in a 9394 // namespace scope other than global scope or declared static in global 9395 // scope. 9396 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9397 return true; 9398 9399 // C++ [basic.stc.dynamic.deallocation]p2: 9400 // Each deallocation function shall return void and its first parameter 9401 // shall be void*. 9402 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9403 SemaRef.Context.VoidPtrTy, 9404 diag::err_operator_delete_dependent_param_type, 9405 diag::err_operator_delete_param_type)) 9406 return true; 9407 9408 return false; 9409} 9410 9411/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9412/// of this overloaded operator is well-formed. If so, returns false; 9413/// otherwise, emits appropriate diagnostics and returns true. 9414bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9415 assert(FnDecl && FnDecl->isOverloadedOperator() && 9416 "Expected an overloaded operator declaration"); 9417 9418 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9419 9420 // C++ [over.oper]p5: 9421 // The allocation and deallocation functions, operator new, 9422 // operator new[], operator delete and operator delete[], are 9423 // described completely in 3.7.3. The attributes and restrictions 9424 // found in the rest of this subclause do not apply to them unless 9425 // explicitly stated in 3.7.3. 9426 if (Op == OO_Delete || Op == OO_Array_Delete) 9427 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9428 9429 if (Op == OO_New || Op == OO_Array_New) 9430 return CheckOperatorNewDeclaration(*this, FnDecl); 9431 9432 // C++ [over.oper]p6: 9433 // An operator function shall either be a non-static member 9434 // function or be a non-member function and have at least one 9435 // parameter whose type is a class, a reference to a class, an 9436 // enumeration, or a reference to an enumeration. 9437 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9438 if (MethodDecl->isStatic()) 9439 return Diag(FnDecl->getLocation(), 9440 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9441 } else { 9442 bool ClassOrEnumParam = false; 9443 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9444 ParamEnd = FnDecl->param_end(); 9445 Param != ParamEnd; ++Param) { 9446 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9447 if (ParamType->isDependentType() || ParamType->isRecordType() || 9448 ParamType->isEnumeralType()) { 9449 ClassOrEnumParam = true; 9450 break; 9451 } 9452 } 9453 9454 if (!ClassOrEnumParam) 9455 return Diag(FnDecl->getLocation(), 9456 diag::err_operator_overload_needs_class_or_enum) 9457 << FnDecl->getDeclName(); 9458 } 9459 9460 // C++ [over.oper]p8: 9461 // An operator function cannot have default arguments (8.3.6), 9462 // except where explicitly stated below. 9463 // 9464 // Only the function-call operator allows default arguments 9465 // (C++ [over.call]p1). 9466 if (Op != OO_Call) { 9467 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9468 Param != FnDecl->param_end(); ++Param) { 9469 if ((*Param)->hasDefaultArg()) 9470 return Diag((*Param)->getLocation(), 9471 diag::err_operator_overload_default_arg) 9472 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9473 } 9474 } 9475 9476 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9477 { false, false, false } 9478#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9479 , { Unary, Binary, MemberOnly } 9480#include "clang/Basic/OperatorKinds.def" 9481 }; 9482 9483 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9484 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9485 bool MustBeMemberOperator = OperatorUses[Op][2]; 9486 9487 // C++ [over.oper]p8: 9488 // [...] Operator functions cannot have more or fewer parameters 9489 // than the number required for the corresponding operator, as 9490 // described in the rest of this subclause. 9491 unsigned NumParams = FnDecl->getNumParams() 9492 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9493 if (Op != OO_Call && 9494 ((NumParams == 1 && !CanBeUnaryOperator) || 9495 (NumParams == 2 && !CanBeBinaryOperator) || 9496 (NumParams < 1) || (NumParams > 2))) { 9497 // We have the wrong number of parameters. 9498 unsigned ErrorKind; 9499 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9500 ErrorKind = 2; // 2 -> unary or binary. 9501 } else if (CanBeUnaryOperator) { 9502 ErrorKind = 0; // 0 -> unary 9503 } else { 9504 assert(CanBeBinaryOperator && 9505 "All non-call overloaded operators are unary or binary!"); 9506 ErrorKind = 1; // 1 -> binary 9507 } 9508 9509 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9510 << FnDecl->getDeclName() << NumParams << ErrorKind; 9511 } 9512 9513 // Overloaded operators other than operator() cannot be variadic. 9514 if (Op != OO_Call && 9515 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9516 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9517 << FnDecl->getDeclName(); 9518 } 9519 9520 // Some operators must be non-static member functions. 9521 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9522 return Diag(FnDecl->getLocation(), 9523 diag::err_operator_overload_must_be_member) 9524 << FnDecl->getDeclName(); 9525 } 9526 9527 // C++ [over.inc]p1: 9528 // The user-defined function called operator++ implements the 9529 // prefix and postfix ++ operator. If this function is a member 9530 // function with no parameters, or a non-member function with one 9531 // parameter of class or enumeration type, it defines the prefix 9532 // increment operator ++ for objects of that type. If the function 9533 // is a member function with one parameter (which shall be of type 9534 // int) or a non-member function with two parameters (the second 9535 // of which shall be of type int), it defines the postfix 9536 // increment operator ++ for objects of that type. 9537 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9538 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9539 bool ParamIsInt = false; 9540 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9541 ParamIsInt = BT->getKind() == BuiltinType::Int; 9542 9543 if (!ParamIsInt) 9544 return Diag(LastParam->getLocation(), 9545 diag::err_operator_overload_post_incdec_must_be_int) 9546 << LastParam->getType() << (Op == OO_MinusMinus); 9547 } 9548 9549 return false; 9550} 9551 9552/// CheckLiteralOperatorDeclaration - Check whether the declaration 9553/// of this literal operator function is well-formed. If so, returns 9554/// false; otherwise, emits appropriate diagnostics and returns true. 9555bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9556 if (isa<CXXMethodDecl>(FnDecl)) { 9557 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9558 << FnDecl->getDeclName(); 9559 return true; 9560 } 9561 9562 if (FnDecl->isExternC()) { 9563 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 9564 return true; 9565 } 9566 9567 bool Valid = false; 9568 9569 // This might be the definition of a literal operator template. 9570 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 9571 // This might be a specialization of a literal operator template. 9572 if (!TpDecl) 9573 TpDecl = FnDecl->getPrimaryTemplate(); 9574 9575 // template <char...> type operator "" name() is the only valid template 9576 // signature, and the only valid signature with no parameters. 9577 if (TpDecl) { 9578 if (FnDecl->param_size() == 0) { 9579 // Must have only one template parameter 9580 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9581 if (Params->size() == 1) { 9582 NonTypeTemplateParmDecl *PmDecl = 9583 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9584 9585 // The template parameter must be a char parameter pack. 9586 if (PmDecl && PmDecl->isTemplateParameterPack() && 9587 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9588 Valid = true; 9589 } 9590 } 9591 } else if (FnDecl->param_size()) { 9592 // Check the first parameter 9593 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9594 9595 QualType T = (*Param)->getType().getUnqualifiedType(); 9596 9597 // unsigned long long int, long double, and any character type are allowed 9598 // as the only parameters. 9599 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9600 Context.hasSameType(T, Context.LongDoubleTy) || 9601 Context.hasSameType(T, Context.CharTy) || 9602 Context.hasSameType(T, Context.WCharTy) || 9603 Context.hasSameType(T, Context.Char16Ty) || 9604 Context.hasSameType(T, Context.Char32Ty)) { 9605 if (++Param == FnDecl->param_end()) 9606 Valid = true; 9607 goto FinishedParams; 9608 } 9609 9610 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9611 const PointerType *PT = T->getAs<PointerType>(); 9612 if (!PT) 9613 goto FinishedParams; 9614 T = PT->getPointeeType(); 9615 if (!T.isConstQualified() || T.isVolatileQualified()) 9616 goto FinishedParams; 9617 T = T.getUnqualifiedType(); 9618 9619 // Move on to the second parameter; 9620 ++Param; 9621 9622 // If there is no second parameter, the first must be a const char * 9623 if (Param == FnDecl->param_end()) { 9624 if (Context.hasSameType(T, Context.CharTy)) 9625 Valid = true; 9626 goto FinishedParams; 9627 } 9628 9629 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9630 // are allowed as the first parameter to a two-parameter function 9631 if (!(Context.hasSameType(T, Context.CharTy) || 9632 Context.hasSameType(T, Context.WCharTy) || 9633 Context.hasSameType(T, Context.Char16Ty) || 9634 Context.hasSameType(T, Context.Char32Ty))) 9635 goto FinishedParams; 9636 9637 // The second and final parameter must be an std::size_t 9638 T = (*Param)->getType().getUnqualifiedType(); 9639 if (Context.hasSameType(T, Context.getSizeType()) && 9640 ++Param == FnDecl->param_end()) 9641 Valid = true; 9642 } 9643 9644 // FIXME: This diagnostic is absolutely terrible. 9645FinishedParams: 9646 if (!Valid) { 9647 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9648 << FnDecl->getDeclName(); 9649 return true; 9650 } 9651 9652 // A parameter-declaration-clause containing a default argument is not 9653 // equivalent to any of the permitted forms. 9654 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9655 ParamEnd = FnDecl->param_end(); 9656 Param != ParamEnd; ++Param) { 9657 if ((*Param)->hasDefaultArg()) { 9658 Diag((*Param)->getDefaultArgRange().getBegin(), 9659 diag::err_literal_operator_default_argument) 9660 << (*Param)->getDefaultArgRange(); 9661 break; 9662 } 9663 } 9664 9665 StringRef LiteralName 9666 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9667 if (LiteralName[0] != '_') { 9668 // C++11 [usrlit.suffix]p1: 9669 // Literal suffix identifiers that do not start with an underscore 9670 // are reserved for future standardization. 9671 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9672 } 9673 9674 return false; 9675} 9676 9677/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9678/// linkage specification, including the language and (if present) 9679/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9680/// the location of the language string literal, which is provided 9681/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9682/// the '{' brace. Otherwise, this linkage specification does not 9683/// have any braces. 9684Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9685 SourceLocation LangLoc, 9686 StringRef Lang, 9687 SourceLocation LBraceLoc) { 9688 LinkageSpecDecl::LanguageIDs Language; 9689 if (Lang == "\"C\"") 9690 Language = LinkageSpecDecl::lang_c; 9691 else if (Lang == "\"C++\"") 9692 Language = LinkageSpecDecl::lang_cxx; 9693 else { 9694 Diag(LangLoc, diag::err_bad_language); 9695 return 0; 9696 } 9697 9698 // FIXME: Add all the various semantics of linkage specifications 9699 9700 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9701 ExternLoc, LangLoc, Language); 9702 CurContext->addDecl(D); 9703 PushDeclContext(S, D); 9704 return D; 9705} 9706 9707/// ActOnFinishLinkageSpecification - Complete the definition of 9708/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9709/// valid, it's the position of the closing '}' brace in a linkage 9710/// specification that uses braces. 9711Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9712 Decl *LinkageSpec, 9713 SourceLocation RBraceLoc) { 9714 if (LinkageSpec) { 9715 if (RBraceLoc.isValid()) { 9716 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9717 LSDecl->setRBraceLoc(RBraceLoc); 9718 } 9719 PopDeclContext(); 9720 } 9721 return LinkageSpec; 9722} 9723 9724/// \brief Perform semantic analysis for the variable declaration that 9725/// occurs within a C++ catch clause, returning the newly-created 9726/// variable. 9727VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9728 TypeSourceInfo *TInfo, 9729 SourceLocation StartLoc, 9730 SourceLocation Loc, 9731 IdentifierInfo *Name) { 9732 bool Invalid = false; 9733 QualType ExDeclType = TInfo->getType(); 9734 9735 // Arrays and functions decay. 9736 if (ExDeclType->isArrayType()) 9737 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9738 else if (ExDeclType->isFunctionType()) 9739 ExDeclType = Context.getPointerType(ExDeclType); 9740 9741 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9742 // The exception-declaration shall not denote a pointer or reference to an 9743 // incomplete type, other than [cv] void*. 9744 // N2844 forbids rvalue references. 9745 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9746 Diag(Loc, diag::err_catch_rvalue_ref); 9747 Invalid = true; 9748 } 9749 9750 QualType BaseType = ExDeclType; 9751 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9752 unsigned DK = diag::err_catch_incomplete; 9753 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9754 BaseType = Ptr->getPointeeType(); 9755 Mode = 1; 9756 DK = diag::err_catch_incomplete_ptr; 9757 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9758 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9759 BaseType = Ref->getPointeeType(); 9760 Mode = 2; 9761 DK = diag::err_catch_incomplete_ref; 9762 } 9763 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9764 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 9765 Invalid = true; 9766 9767 if (!Invalid && !ExDeclType->isDependentType() && 9768 RequireNonAbstractType(Loc, ExDeclType, 9769 diag::err_abstract_type_in_decl, 9770 AbstractVariableType)) 9771 Invalid = true; 9772 9773 // Only the non-fragile NeXT runtime currently supports C++ catches 9774 // of ObjC types, and no runtime supports catching ObjC types by value. 9775 if (!Invalid && getLangOpts().ObjC1) { 9776 QualType T = ExDeclType; 9777 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9778 T = RT->getPointeeType(); 9779 9780 if (T->isObjCObjectType()) { 9781 Diag(Loc, diag::err_objc_object_catch); 9782 Invalid = true; 9783 } else if (T->isObjCObjectPointerType()) { 9784 if (!getLangOpts().ObjCNonFragileABI) 9785 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9786 } 9787 } 9788 9789 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9790 ExDeclType, TInfo, SC_None, SC_None); 9791 ExDecl->setExceptionVariable(true); 9792 9793 // In ARC, infer 'retaining' for variables of retainable type. 9794 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9795 Invalid = true; 9796 9797 if (!Invalid && !ExDeclType->isDependentType()) { 9798 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9799 // C++ [except.handle]p16: 9800 // The object declared in an exception-declaration or, if the 9801 // exception-declaration does not specify a name, a temporary (12.2) is 9802 // copy-initialized (8.5) from the exception object. [...] 9803 // The object is destroyed when the handler exits, after the destruction 9804 // of any automatic objects initialized within the handler. 9805 // 9806 // We just pretend to initialize the object with itself, then make sure 9807 // it can be destroyed later. 9808 QualType initType = ExDeclType; 9809 9810 InitializedEntity entity = 9811 InitializedEntity::InitializeVariable(ExDecl); 9812 InitializationKind initKind = 9813 InitializationKind::CreateCopy(Loc, SourceLocation()); 9814 9815 Expr *opaqueValue = 9816 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9817 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9818 ExprResult result = sequence.Perform(*this, entity, initKind, 9819 MultiExprArg(&opaqueValue, 1)); 9820 if (result.isInvalid()) 9821 Invalid = true; 9822 else { 9823 // If the constructor used was non-trivial, set this as the 9824 // "initializer". 9825 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9826 if (!construct->getConstructor()->isTrivial()) { 9827 Expr *init = MaybeCreateExprWithCleanups(construct); 9828 ExDecl->setInit(init); 9829 } 9830 9831 // And make sure it's destructable. 9832 FinalizeVarWithDestructor(ExDecl, recordType); 9833 } 9834 } 9835 } 9836 9837 if (Invalid) 9838 ExDecl->setInvalidDecl(); 9839 9840 return ExDecl; 9841} 9842 9843/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9844/// handler. 9845Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9846 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9847 bool Invalid = D.isInvalidType(); 9848 9849 // Check for unexpanded parameter packs. 9850 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9851 UPPC_ExceptionType)) { 9852 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9853 D.getIdentifierLoc()); 9854 Invalid = true; 9855 } 9856 9857 IdentifierInfo *II = D.getIdentifier(); 9858 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9859 LookupOrdinaryName, 9860 ForRedeclaration)) { 9861 // The scope should be freshly made just for us. There is just no way 9862 // it contains any previous declaration. 9863 assert(!S->isDeclScope(PrevDecl)); 9864 if (PrevDecl->isTemplateParameter()) { 9865 // Maybe we will complain about the shadowed template parameter. 9866 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9867 PrevDecl = 0; 9868 } 9869 } 9870 9871 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9872 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9873 << D.getCXXScopeSpec().getRange(); 9874 Invalid = true; 9875 } 9876 9877 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9878 D.getLocStart(), 9879 D.getIdentifierLoc(), 9880 D.getIdentifier()); 9881 if (Invalid) 9882 ExDecl->setInvalidDecl(); 9883 9884 // Add the exception declaration into this scope. 9885 if (II) 9886 PushOnScopeChains(ExDecl, S); 9887 else 9888 CurContext->addDecl(ExDecl); 9889 9890 ProcessDeclAttributes(S, ExDecl, D); 9891 return ExDecl; 9892} 9893 9894Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9895 Expr *AssertExpr, 9896 Expr *AssertMessageExpr_, 9897 SourceLocation RParenLoc) { 9898 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9899 9900 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9901 // In a static_assert-declaration, the constant-expression shall be a 9902 // constant expression that can be contextually converted to bool. 9903 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 9904 if (Converted.isInvalid()) 9905 return 0; 9906 9907 llvm::APSInt Cond; 9908 if (VerifyIntegerConstantExpression(Converted.get(), &Cond, 9909 diag::err_static_assert_expression_is_not_constant, 9910 /*AllowFold=*/false).isInvalid()) 9911 return 0; 9912 9913 if (!Cond) { 9914 llvm::SmallString<256> MsgBuffer; 9915 llvm::raw_svector_ostream Msg(MsgBuffer); 9916 AssertMessage->printPretty(Msg, Context, 0, getPrintingPolicy()); 9917 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9918 << Msg.str() << AssertExpr->getSourceRange(); 9919 } 9920 } 9921 9922 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9923 return 0; 9924 9925 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9926 AssertExpr, AssertMessage, RParenLoc); 9927 9928 CurContext->addDecl(Decl); 9929 return Decl; 9930} 9931 9932/// \brief Perform semantic analysis of the given friend type declaration. 9933/// 9934/// \returns A friend declaration that. 9935FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc, 9936 SourceLocation FriendLoc, 9937 TypeSourceInfo *TSInfo) { 9938 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9939 9940 QualType T = TSInfo->getType(); 9941 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9942 9943 // C++03 [class.friend]p2: 9944 // An elaborated-type-specifier shall be used in a friend declaration 9945 // for a class.* 9946 // 9947 // * The class-key of the elaborated-type-specifier is required. 9948 if (!ActiveTemplateInstantiations.empty()) { 9949 // Do not complain about the form of friend template types during 9950 // template instantiation; we will already have complained when the 9951 // template was declared. 9952 } else if (!T->isElaboratedTypeSpecifier()) { 9953 // If we evaluated the type to a record type, suggest putting 9954 // a tag in front. 9955 if (const RecordType *RT = T->getAs<RecordType>()) { 9956 RecordDecl *RD = RT->getDecl(); 9957 9958 std::string InsertionText = std::string(" ") + RD->getKindName(); 9959 9960 Diag(TypeRange.getBegin(), 9961 getLangOpts().CPlusPlus0x ? 9962 diag::warn_cxx98_compat_unelaborated_friend_type : 9963 diag::ext_unelaborated_friend_type) 9964 << (unsigned) RD->getTagKind() 9965 << T 9966 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9967 InsertionText); 9968 } else { 9969 Diag(FriendLoc, 9970 getLangOpts().CPlusPlus0x ? 9971 diag::warn_cxx98_compat_nonclass_type_friend : 9972 diag::ext_nonclass_type_friend) 9973 << T 9974 << SourceRange(FriendLoc, TypeRange.getEnd()); 9975 } 9976 } else if (T->getAs<EnumType>()) { 9977 Diag(FriendLoc, 9978 getLangOpts().CPlusPlus0x ? 9979 diag::warn_cxx98_compat_enum_friend : 9980 diag::ext_enum_friend) 9981 << T 9982 << SourceRange(FriendLoc, TypeRange.getEnd()); 9983 } 9984 9985 // C++0x [class.friend]p3: 9986 // If the type specifier in a friend declaration designates a (possibly 9987 // cv-qualified) class type, that class is declared as a friend; otherwise, 9988 // the friend declaration is ignored. 9989 9990 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9991 // in [class.friend]p3 that we do not implement. 9992 9993 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc); 9994} 9995 9996/// Handle a friend tag declaration where the scope specifier was 9997/// templated. 9998Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9999 unsigned TagSpec, SourceLocation TagLoc, 10000 CXXScopeSpec &SS, 10001 IdentifierInfo *Name, SourceLocation NameLoc, 10002 AttributeList *Attr, 10003 MultiTemplateParamsArg TempParamLists) { 10004 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 10005 10006 bool isExplicitSpecialization = false; 10007 bool Invalid = false; 10008 10009 if (TemplateParameterList *TemplateParams 10010 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 10011 TempParamLists.get(), 10012 TempParamLists.size(), 10013 /*friend*/ true, 10014 isExplicitSpecialization, 10015 Invalid)) { 10016 if (TemplateParams->size() > 0) { 10017 // This is a declaration of a class template. 10018 if (Invalid) 10019 return 0; 10020 10021 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 10022 SS, Name, NameLoc, Attr, 10023 TemplateParams, AS_public, 10024 /*ModulePrivateLoc=*/SourceLocation(), 10025 TempParamLists.size() - 1, 10026 (TemplateParameterList**) TempParamLists.release()).take(); 10027 } else { 10028 // The "template<>" header is extraneous. 10029 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 10030 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 10031 isExplicitSpecialization = true; 10032 } 10033 } 10034 10035 if (Invalid) return 0; 10036 10037 bool isAllExplicitSpecializations = true; 10038 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 10039 if (TempParamLists.get()[I]->size()) { 10040 isAllExplicitSpecializations = false; 10041 break; 10042 } 10043 } 10044 10045 // FIXME: don't ignore attributes. 10046 10047 // If it's explicit specializations all the way down, just forget 10048 // about the template header and build an appropriate non-templated 10049 // friend. TODO: for source fidelity, remember the headers. 10050 if (isAllExplicitSpecializations) { 10051 if (SS.isEmpty()) { 10052 bool Owned = false; 10053 bool IsDependent = false; 10054 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 10055 Attr, AS_public, 10056 /*ModulePrivateLoc=*/SourceLocation(), 10057 MultiTemplateParamsArg(), Owned, IsDependent, 10058 /*ScopedEnumKWLoc=*/SourceLocation(), 10059 /*ScopedEnumUsesClassTag=*/false, 10060 /*UnderlyingType=*/TypeResult()); 10061 } 10062 10063 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 10064 ElaboratedTypeKeyword Keyword 10065 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10066 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 10067 *Name, NameLoc); 10068 if (T.isNull()) 10069 return 0; 10070 10071 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10072 if (isa<DependentNameType>(T)) { 10073 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10074 TL.setElaboratedKeywordLoc(TagLoc); 10075 TL.setQualifierLoc(QualifierLoc); 10076 TL.setNameLoc(NameLoc); 10077 } else { 10078 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 10079 TL.setElaboratedKeywordLoc(TagLoc); 10080 TL.setQualifierLoc(QualifierLoc); 10081 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 10082 } 10083 10084 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10085 TSI, FriendLoc); 10086 Friend->setAccess(AS_public); 10087 CurContext->addDecl(Friend); 10088 return Friend; 10089 } 10090 10091 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 10092 10093 10094 10095 // Handle the case of a templated-scope friend class. e.g. 10096 // template <class T> class A<T>::B; 10097 // FIXME: we don't support these right now. 10098 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10099 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 10100 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10101 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10102 TL.setElaboratedKeywordLoc(TagLoc); 10103 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 10104 TL.setNameLoc(NameLoc); 10105 10106 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10107 TSI, FriendLoc); 10108 Friend->setAccess(AS_public); 10109 Friend->setUnsupportedFriend(true); 10110 CurContext->addDecl(Friend); 10111 return Friend; 10112} 10113 10114 10115/// Handle a friend type declaration. This works in tandem with 10116/// ActOnTag. 10117/// 10118/// Notes on friend class templates: 10119/// 10120/// We generally treat friend class declarations as if they were 10121/// declaring a class. So, for example, the elaborated type specifier 10122/// in a friend declaration is required to obey the restrictions of a 10123/// class-head (i.e. no typedefs in the scope chain), template 10124/// parameters are required to match up with simple template-ids, &c. 10125/// However, unlike when declaring a template specialization, it's 10126/// okay to refer to a template specialization without an empty 10127/// template parameter declaration, e.g. 10128/// friend class A<T>::B<unsigned>; 10129/// We permit this as a special case; if there are any template 10130/// parameters present at all, require proper matching, i.e. 10131/// template <> template <class T> friend class A<int>::B; 10132Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 10133 MultiTemplateParamsArg TempParams) { 10134 SourceLocation Loc = DS.getLocStart(); 10135 10136 assert(DS.isFriendSpecified()); 10137 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10138 10139 // Try to convert the decl specifier to a type. This works for 10140 // friend templates because ActOnTag never produces a ClassTemplateDecl 10141 // for a TUK_Friend. 10142 Declarator TheDeclarator(DS, Declarator::MemberContext); 10143 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 10144 QualType T = TSI->getType(); 10145 if (TheDeclarator.isInvalidType()) 10146 return 0; 10147 10148 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 10149 return 0; 10150 10151 // This is definitely an error in C++98. It's probably meant to 10152 // be forbidden in C++0x, too, but the specification is just 10153 // poorly written. 10154 // 10155 // The problem is with declarations like the following: 10156 // template <T> friend A<T>::foo; 10157 // where deciding whether a class C is a friend or not now hinges 10158 // on whether there exists an instantiation of A that causes 10159 // 'foo' to equal C. There are restrictions on class-heads 10160 // (which we declare (by fiat) elaborated friend declarations to 10161 // be) that makes this tractable. 10162 // 10163 // FIXME: handle "template <> friend class A<T>;", which 10164 // is possibly well-formed? Who even knows? 10165 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 10166 Diag(Loc, diag::err_tagless_friend_type_template) 10167 << DS.getSourceRange(); 10168 return 0; 10169 } 10170 10171 // C++98 [class.friend]p1: A friend of a class is a function 10172 // or class that is not a member of the class . . . 10173 // This is fixed in DR77, which just barely didn't make the C++03 10174 // deadline. It's also a very silly restriction that seriously 10175 // affects inner classes and which nobody else seems to implement; 10176 // thus we never diagnose it, not even in -pedantic. 10177 // 10178 // But note that we could warn about it: it's always useless to 10179 // friend one of your own members (it's not, however, worthless to 10180 // friend a member of an arbitrary specialization of your template). 10181 10182 Decl *D; 10183 if (unsigned NumTempParamLists = TempParams.size()) 10184 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10185 NumTempParamLists, 10186 TempParams.release(), 10187 TSI, 10188 DS.getFriendSpecLoc()); 10189 else 10190 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 10191 10192 if (!D) 10193 return 0; 10194 10195 D->setAccess(AS_public); 10196 CurContext->addDecl(D); 10197 10198 return D; 10199} 10200 10201Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 10202 MultiTemplateParamsArg TemplateParams) { 10203 const DeclSpec &DS = D.getDeclSpec(); 10204 10205 assert(DS.isFriendSpecified()); 10206 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10207 10208 SourceLocation Loc = D.getIdentifierLoc(); 10209 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10210 10211 // C++ [class.friend]p1 10212 // A friend of a class is a function or class.... 10213 // Note that this sees through typedefs, which is intended. 10214 // It *doesn't* see through dependent types, which is correct 10215 // according to [temp.arg.type]p3: 10216 // If a declaration acquires a function type through a 10217 // type dependent on a template-parameter and this causes 10218 // a declaration that does not use the syntactic form of a 10219 // function declarator to have a function type, the program 10220 // is ill-formed. 10221 if (!TInfo->getType()->isFunctionType()) { 10222 Diag(Loc, diag::err_unexpected_friend); 10223 10224 // It might be worthwhile to try to recover by creating an 10225 // appropriate declaration. 10226 return 0; 10227 } 10228 10229 // C++ [namespace.memdef]p3 10230 // - If a friend declaration in a non-local class first declares a 10231 // class or function, the friend class or function is a member 10232 // of the innermost enclosing namespace. 10233 // - The name of the friend is not found by simple name lookup 10234 // until a matching declaration is provided in that namespace 10235 // scope (either before or after the class declaration granting 10236 // friendship). 10237 // - If a friend function is called, its name may be found by the 10238 // name lookup that considers functions from namespaces and 10239 // classes associated with the types of the function arguments. 10240 // - When looking for a prior declaration of a class or a function 10241 // declared as a friend, scopes outside the innermost enclosing 10242 // namespace scope are not considered. 10243 10244 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10245 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10246 DeclarationName Name = NameInfo.getName(); 10247 assert(Name); 10248 10249 // Check for unexpanded parameter packs. 10250 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10251 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10252 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10253 return 0; 10254 10255 // The context we found the declaration in, or in which we should 10256 // create the declaration. 10257 DeclContext *DC; 10258 Scope *DCScope = S; 10259 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10260 ForRedeclaration); 10261 10262 // FIXME: there are different rules in local classes 10263 10264 // There are four cases here. 10265 // - There's no scope specifier, in which case we just go to the 10266 // appropriate scope and look for a function or function template 10267 // there as appropriate. 10268 // Recover from invalid scope qualifiers as if they just weren't there. 10269 if (SS.isInvalid() || !SS.isSet()) { 10270 // C++0x [namespace.memdef]p3: 10271 // If the name in a friend declaration is neither qualified nor 10272 // a template-id and the declaration is a function or an 10273 // elaborated-type-specifier, the lookup to determine whether 10274 // the entity has been previously declared shall not consider 10275 // any scopes outside the innermost enclosing namespace. 10276 // C++0x [class.friend]p11: 10277 // If a friend declaration appears in a local class and the name 10278 // specified is an unqualified name, a prior declaration is 10279 // looked up without considering scopes that are outside the 10280 // innermost enclosing non-class scope. For a friend function 10281 // declaration, if there is no prior declaration, the program is 10282 // ill-formed. 10283 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10284 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10285 10286 // Find the appropriate context according to the above. 10287 DC = CurContext; 10288 while (true) { 10289 // Skip class contexts. If someone can cite chapter and verse 10290 // for this behavior, that would be nice --- it's what GCC and 10291 // EDG do, and it seems like a reasonable intent, but the spec 10292 // really only says that checks for unqualified existing 10293 // declarations should stop at the nearest enclosing namespace, 10294 // not that they should only consider the nearest enclosing 10295 // namespace. 10296 while (DC->isRecord() || DC->isTransparentContext()) 10297 DC = DC->getParent(); 10298 10299 LookupQualifiedName(Previous, DC); 10300 10301 // TODO: decide what we think about using declarations. 10302 if (isLocal || !Previous.empty()) 10303 break; 10304 10305 if (isTemplateId) { 10306 if (isa<TranslationUnitDecl>(DC)) break; 10307 } else { 10308 if (DC->isFileContext()) break; 10309 } 10310 DC = DC->getParent(); 10311 } 10312 10313 // C++ [class.friend]p1: A friend of a class is a function or 10314 // class that is not a member of the class . . . 10315 // C++11 changes this for both friend types and functions. 10316 // Most C++ 98 compilers do seem to give an error here, so 10317 // we do, too. 10318 if (!Previous.empty() && DC->Equals(CurContext)) 10319 Diag(DS.getFriendSpecLoc(), 10320 getLangOpts().CPlusPlus0x ? 10321 diag::warn_cxx98_compat_friend_is_member : 10322 diag::err_friend_is_member); 10323 10324 DCScope = getScopeForDeclContext(S, DC); 10325 10326 // C++ [class.friend]p6: 10327 // A function can be defined in a friend declaration of a class if and 10328 // only if the class is a non-local class (9.8), the function name is 10329 // unqualified, and the function has namespace scope. 10330 if (isLocal && D.isFunctionDefinition()) { 10331 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10332 } 10333 10334 // - There's a non-dependent scope specifier, in which case we 10335 // compute it and do a previous lookup there for a function 10336 // or function template. 10337 } else if (!SS.getScopeRep()->isDependent()) { 10338 DC = computeDeclContext(SS); 10339 if (!DC) return 0; 10340 10341 if (RequireCompleteDeclContext(SS, DC)) return 0; 10342 10343 LookupQualifiedName(Previous, DC); 10344 10345 // Ignore things found implicitly in the wrong scope. 10346 // TODO: better diagnostics for this case. Suggesting the right 10347 // qualified scope would be nice... 10348 LookupResult::Filter F = Previous.makeFilter(); 10349 while (F.hasNext()) { 10350 NamedDecl *D = F.next(); 10351 if (!DC->InEnclosingNamespaceSetOf( 10352 D->getDeclContext()->getRedeclContext())) 10353 F.erase(); 10354 } 10355 F.done(); 10356 10357 if (Previous.empty()) { 10358 D.setInvalidType(); 10359 Diag(Loc, diag::err_qualified_friend_not_found) 10360 << Name << TInfo->getType(); 10361 return 0; 10362 } 10363 10364 // C++ [class.friend]p1: A friend of a class is a function or 10365 // class that is not a member of the class . . . 10366 if (DC->Equals(CurContext)) 10367 Diag(DS.getFriendSpecLoc(), 10368 getLangOpts().CPlusPlus0x ? 10369 diag::warn_cxx98_compat_friend_is_member : 10370 diag::err_friend_is_member); 10371 10372 if (D.isFunctionDefinition()) { 10373 // C++ [class.friend]p6: 10374 // A function can be defined in a friend declaration of a class if and 10375 // only if the class is a non-local class (9.8), the function name is 10376 // unqualified, and the function has namespace scope. 10377 SemaDiagnosticBuilder DB 10378 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10379 10380 DB << SS.getScopeRep(); 10381 if (DC->isFileContext()) 10382 DB << FixItHint::CreateRemoval(SS.getRange()); 10383 SS.clear(); 10384 } 10385 10386 // - There's a scope specifier that does not match any template 10387 // parameter lists, in which case we use some arbitrary context, 10388 // create a method or method template, and wait for instantiation. 10389 // - There's a scope specifier that does match some template 10390 // parameter lists, which we don't handle right now. 10391 } else { 10392 if (D.isFunctionDefinition()) { 10393 // C++ [class.friend]p6: 10394 // A function can be defined in a friend declaration of a class if and 10395 // only if the class is a non-local class (9.8), the function name is 10396 // unqualified, and the function has namespace scope. 10397 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10398 << SS.getScopeRep(); 10399 } 10400 10401 DC = CurContext; 10402 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10403 } 10404 10405 if (!DC->isRecord()) { 10406 // This implies that it has to be an operator or function. 10407 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10408 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10409 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10410 Diag(Loc, diag::err_introducing_special_friend) << 10411 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10412 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10413 return 0; 10414 } 10415 } 10416 10417 // FIXME: This is an egregious hack to cope with cases where the scope stack 10418 // does not contain the declaration context, i.e., in an out-of-line 10419 // definition of a class. 10420 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10421 if (!DCScope) { 10422 FakeDCScope.setEntity(DC); 10423 DCScope = &FakeDCScope; 10424 } 10425 10426 bool AddToScope = true; 10427 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10428 move(TemplateParams), AddToScope); 10429 if (!ND) return 0; 10430 10431 assert(ND->getDeclContext() == DC); 10432 assert(ND->getLexicalDeclContext() == CurContext); 10433 10434 // Add the function declaration to the appropriate lookup tables, 10435 // adjusting the redeclarations list as necessary. We don't 10436 // want to do this yet if the friending class is dependent. 10437 // 10438 // Also update the scope-based lookup if the target context's 10439 // lookup context is in lexical scope. 10440 if (!CurContext->isDependentContext()) { 10441 DC = DC->getRedeclContext(); 10442 DC->makeDeclVisibleInContext(ND); 10443 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10444 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10445 } 10446 10447 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10448 D.getIdentifierLoc(), ND, 10449 DS.getFriendSpecLoc()); 10450 FrD->setAccess(AS_public); 10451 CurContext->addDecl(FrD); 10452 10453 if (ND->isInvalidDecl()) 10454 FrD->setInvalidDecl(); 10455 else { 10456 FunctionDecl *FD; 10457 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10458 FD = FTD->getTemplatedDecl(); 10459 else 10460 FD = cast<FunctionDecl>(ND); 10461 10462 // Mark templated-scope function declarations as unsupported. 10463 if (FD->getNumTemplateParameterLists()) 10464 FrD->setUnsupportedFriend(true); 10465 } 10466 10467 return ND; 10468} 10469 10470void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10471 AdjustDeclIfTemplate(Dcl); 10472 10473 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10474 if (!Fn) { 10475 Diag(DelLoc, diag::err_deleted_non_function); 10476 return; 10477 } 10478 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10479 Diag(DelLoc, diag::err_deleted_decl_not_first); 10480 Diag(Prev->getLocation(), diag::note_previous_declaration); 10481 // If the declaration wasn't the first, we delete the function anyway for 10482 // recovery. 10483 } 10484 Fn->setDeletedAsWritten(); 10485 10486 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10487 if (!MD) 10488 return; 10489 10490 // A deleted special member function is trivial if the corresponding 10491 // implicitly-declared function would have been. 10492 switch (getSpecialMember(MD)) { 10493 case CXXInvalid: 10494 break; 10495 case CXXDefaultConstructor: 10496 MD->setTrivial(MD->getParent()->hasTrivialDefaultConstructor()); 10497 break; 10498 case CXXCopyConstructor: 10499 MD->setTrivial(MD->getParent()->hasTrivialCopyConstructor()); 10500 break; 10501 case CXXMoveConstructor: 10502 MD->setTrivial(MD->getParent()->hasTrivialMoveConstructor()); 10503 break; 10504 case CXXCopyAssignment: 10505 MD->setTrivial(MD->getParent()->hasTrivialCopyAssignment()); 10506 break; 10507 case CXXMoveAssignment: 10508 MD->setTrivial(MD->getParent()->hasTrivialMoveAssignment()); 10509 break; 10510 case CXXDestructor: 10511 MD->setTrivial(MD->getParent()->hasTrivialDestructor()); 10512 break; 10513 } 10514} 10515 10516void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10517 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10518 10519 if (MD) { 10520 if (MD->getParent()->isDependentType()) { 10521 MD->setDefaulted(); 10522 MD->setExplicitlyDefaulted(); 10523 return; 10524 } 10525 10526 CXXSpecialMember Member = getSpecialMember(MD); 10527 if (Member == CXXInvalid) { 10528 Diag(DefaultLoc, diag::err_default_special_members); 10529 return; 10530 } 10531 10532 MD->setDefaulted(); 10533 MD->setExplicitlyDefaulted(); 10534 10535 // If this definition appears within the record, do the checking when 10536 // the record is complete. 10537 const FunctionDecl *Primary = MD; 10538 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10539 // Find the uninstantiated declaration that actually had the '= default' 10540 // on it. 10541 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10542 10543 if (Primary == Primary->getCanonicalDecl()) 10544 return; 10545 10546 switch (Member) { 10547 case CXXDefaultConstructor: { 10548 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10549 CheckExplicitlyDefaultedDefaultConstructor(CD); 10550 if (!CD->isInvalidDecl()) 10551 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10552 break; 10553 } 10554 10555 case CXXCopyConstructor: { 10556 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10557 CheckExplicitlyDefaultedCopyConstructor(CD); 10558 if (!CD->isInvalidDecl()) 10559 DefineImplicitCopyConstructor(DefaultLoc, CD); 10560 break; 10561 } 10562 10563 case CXXCopyAssignment: { 10564 CheckExplicitlyDefaultedCopyAssignment(MD); 10565 if (!MD->isInvalidDecl()) 10566 DefineImplicitCopyAssignment(DefaultLoc, MD); 10567 break; 10568 } 10569 10570 case CXXDestructor: { 10571 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10572 CheckExplicitlyDefaultedDestructor(DD); 10573 if (!DD->isInvalidDecl()) 10574 DefineImplicitDestructor(DefaultLoc, DD); 10575 break; 10576 } 10577 10578 case CXXMoveConstructor: { 10579 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10580 CheckExplicitlyDefaultedMoveConstructor(CD); 10581 if (!CD->isInvalidDecl()) 10582 DefineImplicitMoveConstructor(DefaultLoc, CD); 10583 break; 10584 } 10585 10586 case CXXMoveAssignment: { 10587 CheckExplicitlyDefaultedMoveAssignment(MD); 10588 if (!MD->isInvalidDecl()) 10589 DefineImplicitMoveAssignment(DefaultLoc, MD); 10590 break; 10591 } 10592 10593 case CXXInvalid: 10594 llvm_unreachable("Invalid special member."); 10595 } 10596 } else { 10597 Diag(DefaultLoc, diag::err_default_special_members); 10598 } 10599} 10600 10601static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10602 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10603 Stmt *SubStmt = *CI; 10604 if (!SubStmt) 10605 continue; 10606 if (isa<ReturnStmt>(SubStmt)) 10607 Self.Diag(SubStmt->getLocStart(), 10608 diag::err_return_in_constructor_handler); 10609 if (!isa<Expr>(SubStmt)) 10610 SearchForReturnInStmt(Self, SubStmt); 10611 } 10612} 10613 10614void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10615 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10616 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10617 SearchForReturnInStmt(*this, Handler); 10618 } 10619} 10620 10621bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10622 const CXXMethodDecl *Old) { 10623 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10624 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10625 10626 if (Context.hasSameType(NewTy, OldTy) || 10627 NewTy->isDependentType() || OldTy->isDependentType()) 10628 return false; 10629 10630 // Check if the return types are covariant 10631 QualType NewClassTy, OldClassTy; 10632 10633 /// Both types must be pointers or references to classes. 10634 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10635 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10636 NewClassTy = NewPT->getPointeeType(); 10637 OldClassTy = OldPT->getPointeeType(); 10638 } 10639 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10640 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10641 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10642 NewClassTy = NewRT->getPointeeType(); 10643 OldClassTy = OldRT->getPointeeType(); 10644 } 10645 } 10646 } 10647 10648 // The return types aren't either both pointers or references to a class type. 10649 if (NewClassTy.isNull()) { 10650 Diag(New->getLocation(), 10651 diag::err_different_return_type_for_overriding_virtual_function) 10652 << New->getDeclName() << NewTy << OldTy; 10653 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10654 10655 return true; 10656 } 10657 10658 // C++ [class.virtual]p6: 10659 // If the return type of D::f differs from the return type of B::f, the 10660 // class type in the return type of D::f shall be complete at the point of 10661 // declaration of D::f or shall be the class type D. 10662 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10663 if (!RT->isBeingDefined() && 10664 RequireCompleteType(New->getLocation(), NewClassTy, 10665 diag::err_covariant_return_incomplete, 10666 New->getDeclName())) 10667 return true; 10668 } 10669 10670 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10671 // Check if the new class derives from the old class. 10672 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10673 Diag(New->getLocation(), 10674 diag::err_covariant_return_not_derived) 10675 << New->getDeclName() << NewTy << OldTy; 10676 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10677 return true; 10678 } 10679 10680 // Check if we the conversion from derived to base is valid. 10681 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10682 diag::err_covariant_return_inaccessible_base, 10683 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10684 // FIXME: Should this point to the return type? 10685 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10686 // FIXME: this note won't trigger for delayed access control 10687 // diagnostics, and it's impossible to get an undelayed error 10688 // here from access control during the original parse because 10689 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10690 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10691 return true; 10692 } 10693 } 10694 10695 // The qualifiers of the return types must be the same. 10696 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10697 Diag(New->getLocation(), 10698 diag::err_covariant_return_type_different_qualifications) 10699 << New->getDeclName() << NewTy << OldTy; 10700 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10701 return true; 10702 }; 10703 10704 10705 // The new class type must have the same or less qualifiers as the old type. 10706 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10707 Diag(New->getLocation(), 10708 diag::err_covariant_return_type_class_type_more_qualified) 10709 << New->getDeclName() << NewTy << OldTy; 10710 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10711 return true; 10712 }; 10713 10714 return false; 10715} 10716 10717/// \brief Mark the given method pure. 10718/// 10719/// \param Method the method to be marked pure. 10720/// 10721/// \param InitRange the source range that covers the "0" initializer. 10722bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10723 SourceLocation EndLoc = InitRange.getEnd(); 10724 if (EndLoc.isValid()) 10725 Method->setRangeEnd(EndLoc); 10726 10727 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10728 Method->setPure(); 10729 return false; 10730 } 10731 10732 if (!Method->isInvalidDecl()) 10733 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10734 << Method->getDeclName() << InitRange; 10735 return true; 10736} 10737 10738/// \brief Determine whether the given declaration is a static data member. 10739static bool isStaticDataMember(Decl *D) { 10740 VarDecl *Var = dyn_cast_or_null<VarDecl>(D); 10741 if (!Var) 10742 return false; 10743 10744 return Var->isStaticDataMember(); 10745} 10746/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10747/// an initializer for the out-of-line declaration 'Dcl'. The scope 10748/// is a fresh scope pushed for just this purpose. 10749/// 10750/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10751/// static data member of class X, names should be looked up in the scope of 10752/// class X. 10753void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10754 // If there is no declaration, there was an error parsing it. 10755 if (D == 0 || D->isInvalidDecl()) return; 10756 10757 // We should only get called for declarations with scope specifiers, like: 10758 // int foo::bar; 10759 assert(D->isOutOfLine()); 10760 EnterDeclaratorContext(S, D->getDeclContext()); 10761 10762 // If we are parsing the initializer for a static data member, push a 10763 // new expression evaluation context that is associated with this static 10764 // data member. 10765 if (isStaticDataMember(D)) 10766 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 10767} 10768 10769/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10770/// initializer for the out-of-line declaration 'D'. 10771void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10772 // If there is no declaration, there was an error parsing it. 10773 if (D == 0 || D->isInvalidDecl()) return; 10774 10775 if (isStaticDataMember(D)) 10776 PopExpressionEvaluationContext(); 10777 10778 assert(D->isOutOfLine()); 10779 ExitDeclaratorContext(S); 10780} 10781 10782/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10783/// C++ if/switch/while/for statement. 10784/// e.g: "if (int x = f()) {...}" 10785DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10786 // C++ 6.4p2: 10787 // The declarator shall not specify a function or an array. 10788 // The type-specifier-seq shall not contain typedef and shall not declare a 10789 // new class or enumeration. 10790 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10791 "Parser allowed 'typedef' as storage class of condition decl."); 10792 10793 Decl *Dcl = ActOnDeclarator(S, D); 10794 if (!Dcl) 10795 return true; 10796 10797 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10798 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10799 << D.getSourceRange(); 10800 return true; 10801 } 10802 10803 return Dcl; 10804} 10805 10806void Sema::LoadExternalVTableUses() { 10807 if (!ExternalSource) 10808 return; 10809 10810 SmallVector<ExternalVTableUse, 4> VTables; 10811 ExternalSource->ReadUsedVTables(VTables); 10812 SmallVector<VTableUse, 4> NewUses; 10813 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10814 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10815 = VTablesUsed.find(VTables[I].Record); 10816 // Even if a definition wasn't required before, it may be required now. 10817 if (Pos != VTablesUsed.end()) { 10818 if (!Pos->second && VTables[I].DefinitionRequired) 10819 Pos->second = true; 10820 continue; 10821 } 10822 10823 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10824 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10825 } 10826 10827 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10828} 10829 10830void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10831 bool DefinitionRequired) { 10832 // Ignore any vtable uses in unevaluated operands or for classes that do 10833 // not have a vtable. 10834 if (!Class->isDynamicClass() || Class->isDependentContext() || 10835 CurContext->isDependentContext() || 10836 ExprEvalContexts.back().Context == Unevaluated) 10837 return; 10838 10839 // Try to insert this class into the map. 10840 LoadExternalVTableUses(); 10841 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10842 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10843 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10844 if (!Pos.second) { 10845 // If we already had an entry, check to see if we are promoting this vtable 10846 // to required a definition. If so, we need to reappend to the VTableUses 10847 // list, since we may have already processed the first entry. 10848 if (DefinitionRequired && !Pos.first->second) { 10849 Pos.first->second = true; 10850 } else { 10851 // Otherwise, we can early exit. 10852 return; 10853 } 10854 } 10855 10856 // Local classes need to have their virtual members marked 10857 // immediately. For all other classes, we mark their virtual members 10858 // at the end of the translation unit. 10859 if (Class->isLocalClass()) 10860 MarkVirtualMembersReferenced(Loc, Class); 10861 else 10862 VTableUses.push_back(std::make_pair(Class, Loc)); 10863} 10864 10865bool Sema::DefineUsedVTables() { 10866 LoadExternalVTableUses(); 10867 if (VTableUses.empty()) 10868 return false; 10869 10870 // Note: The VTableUses vector could grow as a result of marking 10871 // the members of a class as "used", so we check the size each 10872 // time through the loop and prefer indices (with are stable) to 10873 // iterators (which are not). 10874 bool DefinedAnything = false; 10875 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10876 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10877 if (!Class) 10878 continue; 10879 10880 SourceLocation Loc = VTableUses[I].second; 10881 10882 // If this class has a key function, but that key function is 10883 // defined in another translation unit, we don't need to emit the 10884 // vtable even though we're using it. 10885 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10886 if (KeyFunction && !KeyFunction->hasBody()) { 10887 switch (KeyFunction->getTemplateSpecializationKind()) { 10888 case TSK_Undeclared: 10889 case TSK_ExplicitSpecialization: 10890 case TSK_ExplicitInstantiationDeclaration: 10891 // The key function is in another translation unit. 10892 continue; 10893 10894 case TSK_ExplicitInstantiationDefinition: 10895 case TSK_ImplicitInstantiation: 10896 // We will be instantiating the key function. 10897 break; 10898 } 10899 } else if (!KeyFunction) { 10900 // If we have a class with no key function that is the subject 10901 // of an explicit instantiation declaration, suppress the 10902 // vtable; it will live with the explicit instantiation 10903 // definition. 10904 bool IsExplicitInstantiationDeclaration 10905 = Class->getTemplateSpecializationKind() 10906 == TSK_ExplicitInstantiationDeclaration; 10907 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10908 REnd = Class->redecls_end(); 10909 R != REnd; ++R) { 10910 TemplateSpecializationKind TSK 10911 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10912 if (TSK == TSK_ExplicitInstantiationDeclaration) 10913 IsExplicitInstantiationDeclaration = true; 10914 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10915 IsExplicitInstantiationDeclaration = false; 10916 break; 10917 } 10918 } 10919 10920 if (IsExplicitInstantiationDeclaration) 10921 continue; 10922 } 10923 10924 // Mark all of the virtual members of this class as referenced, so 10925 // that we can build a vtable. Then, tell the AST consumer that a 10926 // vtable for this class is required. 10927 DefinedAnything = true; 10928 MarkVirtualMembersReferenced(Loc, Class); 10929 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10930 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10931 10932 // Optionally warn if we're emitting a weak vtable. 10933 if (Class->getLinkage() == ExternalLinkage && 10934 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10935 const FunctionDecl *KeyFunctionDef = 0; 10936 if (!KeyFunction || 10937 (KeyFunction->hasBody(KeyFunctionDef) && 10938 KeyFunctionDef->isInlined())) 10939 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10940 TSK_ExplicitInstantiationDefinition 10941 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10942 << Class; 10943 } 10944 } 10945 VTableUses.clear(); 10946 10947 return DefinedAnything; 10948} 10949 10950void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10951 const CXXRecordDecl *RD) { 10952 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10953 e = RD->method_end(); i != e; ++i) { 10954 CXXMethodDecl *MD = &*i; 10955 10956 // C++ [basic.def.odr]p2: 10957 // [...] A virtual member function is used if it is not pure. [...] 10958 if (MD->isVirtual() && !MD->isPure()) 10959 MarkFunctionReferenced(Loc, MD); 10960 } 10961 10962 // Only classes that have virtual bases need a VTT. 10963 if (RD->getNumVBases() == 0) 10964 return; 10965 10966 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10967 e = RD->bases_end(); i != e; ++i) { 10968 const CXXRecordDecl *Base = 10969 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10970 if (Base->getNumVBases() == 0) 10971 continue; 10972 MarkVirtualMembersReferenced(Loc, Base); 10973 } 10974} 10975 10976/// SetIvarInitializers - This routine builds initialization ASTs for the 10977/// Objective-C implementation whose ivars need be initialized. 10978void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10979 if (!getLangOpts().CPlusPlus) 10980 return; 10981 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10982 SmallVector<ObjCIvarDecl*, 8> ivars; 10983 CollectIvarsToConstructOrDestruct(OID, ivars); 10984 if (ivars.empty()) 10985 return; 10986 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10987 for (unsigned i = 0; i < ivars.size(); i++) { 10988 FieldDecl *Field = ivars[i]; 10989 if (Field->isInvalidDecl()) 10990 continue; 10991 10992 CXXCtorInitializer *Member; 10993 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10994 InitializationKind InitKind = 10995 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10996 10997 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10998 ExprResult MemberInit = 10999 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 11000 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 11001 // Note, MemberInit could actually come back empty if no initialization 11002 // is required (e.g., because it would call a trivial default constructor) 11003 if (!MemberInit.get() || MemberInit.isInvalid()) 11004 continue; 11005 11006 Member = 11007 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 11008 SourceLocation(), 11009 MemberInit.takeAs<Expr>(), 11010 SourceLocation()); 11011 AllToInit.push_back(Member); 11012 11013 // Be sure that the destructor is accessible and is marked as referenced. 11014 if (const RecordType *RecordTy 11015 = Context.getBaseElementType(Field->getType()) 11016 ->getAs<RecordType>()) { 11017 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 11018 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 11019 MarkFunctionReferenced(Field->getLocation(), Destructor); 11020 CheckDestructorAccess(Field->getLocation(), Destructor, 11021 PDiag(diag::err_access_dtor_ivar) 11022 << Context.getBaseElementType(Field->getType())); 11023 } 11024 } 11025 } 11026 ObjCImplementation->setIvarInitializers(Context, 11027 AllToInit.data(), AllToInit.size()); 11028 } 11029} 11030 11031static 11032void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 11033 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 11034 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 11035 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 11036 Sema &S) { 11037 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11038 CE = Current.end(); 11039 if (Ctor->isInvalidDecl()) 11040 return; 11041 11042 const FunctionDecl *FNTarget = 0; 11043 CXXConstructorDecl *Target; 11044 11045 // We ignore the result here since if we don't have a body, Target will be 11046 // null below. 11047 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 11048 Target 11049= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 11050 11051 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 11052 // Avoid dereferencing a null pointer here. 11053 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 11054 11055 if (!Current.insert(Canonical)) 11056 return; 11057 11058 // We know that beyond here, we aren't chaining into a cycle. 11059 if (!Target || !Target->isDelegatingConstructor() || 11060 Target->isInvalidDecl() || Valid.count(TCanonical)) { 11061 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11062 Valid.insert(*CI); 11063 Current.clear(); 11064 // We've hit a cycle. 11065 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 11066 Current.count(TCanonical)) { 11067 // If we haven't diagnosed this cycle yet, do so now. 11068 if (!Invalid.count(TCanonical)) { 11069 S.Diag((*Ctor->init_begin())->getSourceLocation(), 11070 diag::warn_delegating_ctor_cycle) 11071 << Ctor; 11072 11073 // Don't add a note for a function delegating directo to itself. 11074 if (TCanonical != Canonical) 11075 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 11076 11077 CXXConstructorDecl *C = Target; 11078 while (C->getCanonicalDecl() != Canonical) { 11079 (void)C->getTargetConstructor()->hasBody(FNTarget); 11080 assert(FNTarget && "Ctor cycle through bodiless function"); 11081 11082 C 11083 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 11084 S.Diag(C->getLocation(), diag::note_which_delegates_to); 11085 } 11086 } 11087 11088 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11089 Invalid.insert(*CI); 11090 Current.clear(); 11091 } else { 11092 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 11093 } 11094} 11095 11096 11097void Sema::CheckDelegatingCtorCycles() { 11098 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 11099 11100 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11101 CE = Current.end(); 11102 11103 for (DelegatingCtorDeclsType::iterator 11104 I = DelegatingCtorDecls.begin(ExternalSource), 11105 E = DelegatingCtorDecls.end(); 11106 I != E; ++I) { 11107 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 11108 } 11109 11110 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 11111 (*CI)->setInvalidDecl(); 11112} 11113 11114namespace { 11115 /// \brief AST visitor that finds references to the 'this' expression. 11116 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { 11117 Sema &S; 11118 11119 public: 11120 explicit FindCXXThisExpr(Sema &S) : S(S) { } 11121 11122 bool VisitCXXThisExpr(CXXThisExpr *E) { 11123 S.Diag(E->getLocation(), diag::err_this_static_member_func) 11124 << E->isImplicit(); 11125 return false; 11126 } 11127 }; 11128} 11129 11130bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { 11131 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11132 if (!TSInfo) 11133 return false; 11134 11135 TypeLoc TL = TSInfo->getTypeLoc(); 11136 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11137 if (!ProtoTL) 11138 return false; 11139 11140 // C++11 [expr.prim.general]p3: 11141 // [The expression this] shall not appear before the optional 11142 // cv-qualifier-seq and it shall not appear within the declaration of a 11143 // static member function (although its type and value category are defined 11144 // within a static member function as they are within a non-static member 11145 // function). [ Note: this is because declaration matching does not occur 11146 // until the complete declarator is known. - end note ] 11147 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11148 FindCXXThisExpr Finder(*this); 11149 11150 // If the return type came after the cv-qualifier-seq, check it now. 11151 if (Proto->hasTrailingReturn() && 11152 !Finder.TraverseTypeLoc(ProtoTL->getResultLoc())) 11153 return true; 11154 11155 // Check the exception specification. 11156 if (checkThisInStaticMemberFunctionExceptionSpec(Method)) 11157 return true; 11158 11159 return checkThisInStaticMemberFunctionAttributes(Method); 11160} 11161 11162bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { 11163 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11164 if (!TSInfo) 11165 return false; 11166 11167 TypeLoc TL = TSInfo->getTypeLoc(); 11168 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11169 if (!ProtoTL) 11170 return false; 11171 11172 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11173 FindCXXThisExpr Finder(*this); 11174 11175 switch (Proto->getExceptionSpecType()) { 11176 case EST_Uninstantiated: 11177 case EST_BasicNoexcept: 11178 case EST_Delayed: 11179 case EST_DynamicNone: 11180 case EST_MSAny: 11181 case EST_None: 11182 break; 11183 11184 case EST_ComputedNoexcept: 11185 if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) 11186 return true; 11187 11188 case EST_Dynamic: 11189 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 11190 EEnd = Proto->exception_end(); 11191 E != EEnd; ++E) { 11192 if (!Finder.TraverseType(*E)) 11193 return true; 11194 } 11195 break; 11196 } 11197 11198 return false; 11199} 11200 11201bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { 11202 FindCXXThisExpr Finder(*this); 11203 11204 // Check attributes. 11205 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end(); 11206 A != AEnd; ++A) { 11207 // FIXME: This should be emitted by tblgen. 11208 Expr *Arg = 0; 11209 ArrayRef<Expr *> Args; 11210 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A)) 11211 Arg = G->getArg(); 11212 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A)) 11213 Arg = G->getArg(); 11214 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A)) 11215 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size()); 11216 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A)) 11217 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size()); 11218 else if (ExclusiveLockFunctionAttr *ELF 11219 = dyn_cast<ExclusiveLockFunctionAttr>(*A)) 11220 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size()); 11221 else if (SharedLockFunctionAttr *SLF 11222 = dyn_cast<SharedLockFunctionAttr>(*A)) 11223 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size()); 11224 else if (ExclusiveTrylockFunctionAttr *ETLF 11225 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) { 11226 Arg = ETLF->getSuccessValue(); 11227 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size()); 11228 } else if (SharedTrylockFunctionAttr *STLF 11229 = dyn_cast<SharedTrylockFunctionAttr>(*A)) { 11230 Arg = STLF->getSuccessValue(); 11231 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size()); 11232 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A)) 11233 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size()); 11234 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A)) 11235 Arg = LR->getArg(); 11236 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A)) 11237 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size()); 11238 else if (ExclusiveLocksRequiredAttr *ELR 11239 = dyn_cast<ExclusiveLocksRequiredAttr>(*A)) 11240 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size()); 11241 else if (SharedLocksRequiredAttr *SLR 11242 = dyn_cast<SharedLocksRequiredAttr>(*A)) 11243 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size()); 11244 11245 if (Arg && !Finder.TraverseStmt(Arg)) 11246 return true; 11247 11248 for (unsigned I = 0, N = Args.size(); I != N; ++I) { 11249 if (!Finder.TraverseStmt(Args[I])) 11250 return true; 11251 } 11252 } 11253 11254 return false; 11255} 11256 11257void 11258Sema::checkExceptionSpecification(ExceptionSpecificationType EST, 11259 ArrayRef<ParsedType> DynamicExceptions, 11260 ArrayRef<SourceRange> DynamicExceptionRanges, 11261 Expr *NoexceptExpr, 11262 llvm::SmallVectorImpl<QualType> &Exceptions, 11263 FunctionProtoType::ExtProtoInfo &EPI) { 11264 Exceptions.clear(); 11265 EPI.ExceptionSpecType = EST; 11266 if (EST == EST_Dynamic) { 11267 Exceptions.reserve(DynamicExceptions.size()); 11268 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { 11269 // FIXME: Preserve type source info. 11270 QualType ET = GetTypeFromParser(DynamicExceptions[ei]); 11271 11272 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 11273 collectUnexpandedParameterPacks(ET, Unexpanded); 11274 if (!Unexpanded.empty()) { 11275 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(), 11276 UPPC_ExceptionType, 11277 Unexpanded); 11278 continue; 11279 } 11280 11281 // Check that the type is valid for an exception spec, and 11282 // drop it if not. 11283 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) 11284 Exceptions.push_back(ET); 11285 } 11286 EPI.NumExceptions = Exceptions.size(); 11287 EPI.Exceptions = Exceptions.data(); 11288 return; 11289 } 11290 11291 if (EST == EST_ComputedNoexcept) { 11292 // If an error occurred, there's no expression here. 11293 if (NoexceptExpr) { 11294 assert((NoexceptExpr->isTypeDependent() || 11295 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 11296 Context.BoolTy) && 11297 "Parser should have made sure that the expression is boolean"); 11298 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { 11299 EPI.ExceptionSpecType = EST_BasicNoexcept; 11300 return; 11301 } 11302 11303 if (!NoexceptExpr->isValueDependent()) 11304 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0, 11305 diag::err_noexcept_needs_constant_expression, 11306 /*AllowFold*/ false).take(); 11307 EPI.NoexceptExpr = NoexceptExpr; 11308 } 11309 return; 11310 } 11311} 11312 11313/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 11314Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 11315 // Implicitly declared functions (e.g. copy constructors) are 11316 // __host__ __device__ 11317 if (D->isImplicit()) 11318 return CFT_HostDevice; 11319 11320 if (D->hasAttr<CUDAGlobalAttr>()) 11321 return CFT_Global; 11322 11323 if (D->hasAttr<CUDADeviceAttr>()) { 11324 if (D->hasAttr<CUDAHostAttr>()) 11325 return CFT_HostDevice; 11326 else 11327 return CFT_Device; 11328 } 11329 11330 return CFT_Host; 11331} 11332 11333bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 11334 CUDAFunctionTarget CalleeTarget) { 11335 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 11336 // Callable from the device only." 11337 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 11338 return true; 11339 11340 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 11341 // Callable from the host only." 11342 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 11343 // Callable from the host only." 11344 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 11345 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 11346 return true; 11347 11348 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 11349 return true; 11350 11351 return false; 11352} 11353