SemaDeclCXX.cpp revision dd25e80a6d67485173fe295f54418e05764cc8cb
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/EvaluatedExprVisitor.h" 27#include "clang/AST/ExprCXX.h" 28#include "clang/AST/RecordLayout.h" 29#include "clang/AST/RecursiveASTVisitor.h" 30#include "clang/AST/StmtVisitor.h" 31#include "clang/AST/TypeLoc.h" 32#include "clang/AST/TypeOrdering.h" 33#include "clang/Sema/DeclSpec.h" 34#include "clang/Sema/ParsedTemplate.h" 35#include "clang/Basic/PartialDiagnostic.h" 36#include "clang/Lex/Preprocessor.h" 37#include "llvm/ADT/SmallString.h" 38#include "llvm/ADT/STLExtras.h" 39#include <map> 40#include <set> 41 42using namespace clang; 43 44//===----------------------------------------------------------------------===// 45// CheckDefaultArgumentVisitor 46//===----------------------------------------------------------------------===// 47 48namespace { 49 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 50 /// the default argument of a parameter to determine whether it 51 /// contains any ill-formed subexpressions. For example, this will 52 /// diagnose the use of local variables or parameters within the 53 /// default argument expression. 54 class CheckDefaultArgumentVisitor 55 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 56 Expr *DefaultArg; 57 Sema *S; 58 59 public: 60 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 61 : DefaultArg(defarg), S(s) {} 62 63 bool VisitExpr(Expr *Node); 64 bool VisitDeclRefExpr(DeclRefExpr *DRE); 65 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 66 bool VisitLambdaExpr(LambdaExpr *Lambda); 67 }; 68 69 /// VisitExpr - Visit all of the children of this expression. 70 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 71 bool IsInvalid = false; 72 for (Stmt::child_range I = Node->children(); I; ++I) 73 IsInvalid |= Visit(*I); 74 return IsInvalid; 75 } 76 77 /// VisitDeclRefExpr - Visit a reference to a declaration, to 78 /// determine whether this declaration can be used in the default 79 /// argument expression. 80 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 81 NamedDecl *Decl = DRE->getDecl(); 82 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 83 // C++ [dcl.fct.default]p9 84 // Default arguments are evaluated each time the function is 85 // called. The order of evaluation of function arguments is 86 // unspecified. Consequently, parameters of a function shall not 87 // be used in default argument expressions, even if they are not 88 // evaluated. Parameters of a function declared before a default 89 // argument expression are in scope and can hide namespace and 90 // class member names. 91 return S->Diag(DRE->getLocStart(), 92 diag::err_param_default_argument_references_param) 93 << Param->getDeclName() << DefaultArg->getSourceRange(); 94 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 95 // C++ [dcl.fct.default]p7 96 // Local variables shall not be used in default argument 97 // expressions. 98 if (VDecl->isLocalVarDecl()) 99 return S->Diag(DRE->getLocStart(), 100 diag::err_param_default_argument_references_local) 101 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 102 } 103 104 return false; 105 } 106 107 /// VisitCXXThisExpr - Visit a C++ "this" expression. 108 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 109 // C++ [dcl.fct.default]p8: 110 // The keyword this shall not be used in a default argument of a 111 // member function. 112 return S->Diag(ThisE->getLocStart(), 113 diag::err_param_default_argument_references_this) 114 << ThisE->getSourceRange(); 115 } 116 117 bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) { 118 // C++11 [expr.lambda.prim]p13: 119 // A lambda-expression appearing in a default argument shall not 120 // implicitly or explicitly capture any entity. 121 if (Lambda->capture_begin() == Lambda->capture_end()) 122 return false; 123 124 return S->Diag(Lambda->getLocStart(), 125 diag::err_lambda_capture_default_arg); 126 } 127} 128 129void Sema::ImplicitExceptionSpecification::CalledDecl(SourceLocation CallLoc, 130 CXXMethodDecl *Method) { 131 // If we have an MSAny spec already, don't bother. 132 if (!Method || ComputedEST == EST_MSAny) 133 return; 134 135 const FunctionProtoType *Proto 136 = Method->getType()->getAs<FunctionProtoType>(); 137 Proto = Self->ResolveExceptionSpec(CallLoc, Proto); 138 if (!Proto) 139 return; 140 141 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 142 143 // If this function can throw any exceptions, make a note of that. 144 if (EST == EST_MSAny || EST == EST_None) { 145 ClearExceptions(); 146 ComputedEST = EST; 147 return; 148 } 149 150 // FIXME: If the call to this decl is using any of its default arguments, we 151 // need to search them for potentially-throwing calls. 152 153 // If this function has a basic noexcept, it doesn't affect the outcome. 154 if (EST == EST_BasicNoexcept) 155 return; 156 157 // If we have a throw-all spec at this point, ignore the function. 158 if (ComputedEST == EST_None) 159 return; 160 161 // If we're still at noexcept(true) and there's a nothrow() callee, 162 // change to that specification. 163 if (EST == EST_DynamicNone) { 164 if (ComputedEST == EST_BasicNoexcept) 165 ComputedEST = EST_DynamicNone; 166 return; 167 } 168 169 // Check out noexcept specs. 170 if (EST == EST_ComputedNoexcept) { 171 FunctionProtoType::NoexceptResult NR = 172 Proto->getNoexceptSpec(Self->Context); 173 assert(NR != FunctionProtoType::NR_NoNoexcept && 174 "Must have noexcept result for EST_ComputedNoexcept."); 175 assert(NR != FunctionProtoType::NR_Dependent && 176 "Should not generate implicit declarations for dependent cases, " 177 "and don't know how to handle them anyway."); 178 179 // noexcept(false) -> no spec on the new function 180 if (NR == FunctionProtoType::NR_Throw) { 181 ClearExceptions(); 182 ComputedEST = EST_None; 183 } 184 // noexcept(true) won't change anything either. 185 return; 186 } 187 188 assert(EST == EST_Dynamic && "EST case not considered earlier."); 189 assert(ComputedEST != EST_None && 190 "Shouldn't collect exceptions when throw-all is guaranteed."); 191 ComputedEST = EST_Dynamic; 192 // Record the exceptions in this function's exception specification. 193 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 194 EEnd = Proto->exception_end(); 195 E != EEnd; ++E) 196 if (ExceptionsSeen.insert(Self->Context.getCanonicalType(*E))) 197 Exceptions.push_back(*E); 198} 199 200void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 201 if (!E || ComputedEST == EST_MSAny) 202 return; 203 204 // FIXME: 205 // 206 // C++0x [except.spec]p14: 207 // [An] implicit exception-specification specifies the type-id T if and 208 // only if T is allowed by the exception-specification of a function directly 209 // invoked by f's implicit definition; f shall allow all exceptions if any 210 // function it directly invokes allows all exceptions, and f shall allow no 211 // exceptions if every function it directly invokes allows no exceptions. 212 // 213 // Note in particular that if an implicit exception-specification is generated 214 // for a function containing a throw-expression, that specification can still 215 // be noexcept(true). 216 // 217 // Note also that 'directly invoked' is not defined in the standard, and there 218 // is no indication that we should only consider potentially-evaluated calls. 219 // 220 // Ultimately we should implement the intent of the standard: the exception 221 // specification should be the set of exceptions which can be thrown by the 222 // implicit definition. For now, we assume that any non-nothrow expression can 223 // throw any exception. 224 225 if (Self->canThrow(E)) 226 ComputedEST = EST_None; 227} 228 229bool 230Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 231 SourceLocation EqualLoc) { 232 if (RequireCompleteType(Param->getLocation(), Param->getType(), 233 diag::err_typecheck_decl_incomplete_type)) { 234 Param->setInvalidDecl(); 235 return true; 236 } 237 238 // C++ [dcl.fct.default]p5 239 // A default argument expression is implicitly converted (clause 240 // 4) to the parameter type. The default argument expression has 241 // the same semantic constraints as the initializer expression in 242 // a declaration of a variable of the parameter type, using the 243 // copy-initialization semantics (8.5). 244 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 245 Param); 246 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 247 EqualLoc); 248 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 249 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 250 MultiExprArg(*this, &Arg, 1)); 251 if (Result.isInvalid()) 252 return true; 253 Arg = Result.takeAs<Expr>(); 254 255 CheckImplicitConversions(Arg, EqualLoc); 256 Arg = MaybeCreateExprWithCleanups(Arg); 257 258 // Okay: add the default argument to the parameter 259 Param->setDefaultArg(Arg); 260 261 // We have already instantiated this parameter; provide each of the 262 // instantiations with the uninstantiated default argument. 263 UnparsedDefaultArgInstantiationsMap::iterator InstPos 264 = UnparsedDefaultArgInstantiations.find(Param); 265 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 266 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 267 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 268 269 // We're done tracking this parameter's instantiations. 270 UnparsedDefaultArgInstantiations.erase(InstPos); 271 } 272 273 return false; 274} 275 276/// ActOnParamDefaultArgument - Check whether the default argument 277/// provided for a function parameter is well-formed. If so, attach it 278/// to the parameter declaration. 279void 280Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 281 Expr *DefaultArg) { 282 if (!param || !DefaultArg) 283 return; 284 285 ParmVarDecl *Param = cast<ParmVarDecl>(param); 286 UnparsedDefaultArgLocs.erase(Param); 287 288 // Default arguments are only permitted in C++ 289 if (!getLangOpts().CPlusPlus) { 290 Diag(EqualLoc, diag::err_param_default_argument) 291 << DefaultArg->getSourceRange(); 292 Param->setInvalidDecl(); 293 return; 294 } 295 296 // Check for unexpanded parameter packs. 297 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 298 Param->setInvalidDecl(); 299 return; 300 } 301 302 // Check that the default argument is well-formed 303 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 304 if (DefaultArgChecker.Visit(DefaultArg)) { 305 Param->setInvalidDecl(); 306 return; 307 } 308 309 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 310} 311 312/// ActOnParamUnparsedDefaultArgument - We've seen a default 313/// argument for a function parameter, but we can't parse it yet 314/// because we're inside a class definition. Note that this default 315/// argument will be parsed later. 316void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 317 SourceLocation EqualLoc, 318 SourceLocation ArgLoc) { 319 if (!param) 320 return; 321 322 ParmVarDecl *Param = cast<ParmVarDecl>(param); 323 if (Param) 324 Param->setUnparsedDefaultArg(); 325 326 UnparsedDefaultArgLocs[Param] = ArgLoc; 327} 328 329/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 330/// the default argument for the parameter param failed. 331void Sema::ActOnParamDefaultArgumentError(Decl *param) { 332 if (!param) 333 return; 334 335 ParmVarDecl *Param = cast<ParmVarDecl>(param); 336 337 Param->setInvalidDecl(); 338 339 UnparsedDefaultArgLocs.erase(Param); 340} 341 342/// CheckExtraCXXDefaultArguments - Check for any extra default 343/// arguments in the declarator, which is not a function declaration 344/// or definition and therefore is not permitted to have default 345/// arguments. This routine should be invoked for every declarator 346/// that is not a function declaration or definition. 347void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 348 // C++ [dcl.fct.default]p3 349 // A default argument expression shall be specified only in the 350 // parameter-declaration-clause of a function declaration or in a 351 // template-parameter (14.1). It shall not be specified for a 352 // parameter pack. If it is specified in a 353 // parameter-declaration-clause, it shall not occur within a 354 // declarator or abstract-declarator of a parameter-declaration. 355 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 356 DeclaratorChunk &chunk = D.getTypeObject(i); 357 if (chunk.Kind == DeclaratorChunk::Function) { 358 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 359 ParmVarDecl *Param = 360 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 361 if (Param->hasUnparsedDefaultArg()) { 362 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 363 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 364 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 365 delete Toks; 366 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 367 } else if (Param->getDefaultArg()) { 368 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 369 << Param->getDefaultArg()->getSourceRange(); 370 Param->setDefaultArg(0); 371 } 372 } 373 } 374 } 375} 376 377// MergeCXXFunctionDecl - Merge two declarations of the same C++ 378// function, once we already know that they have the same 379// type. Subroutine of MergeFunctionDecl. Returns true if there was an 380// error, false otherwise. 381bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old, 382 Scope *S) { 383 bool Invalid = false; 384 385 // C++ [dcl.fct.default]p4: 386 // For non-template functions, default arguments can be added in 387 // later declarations of a function in the same 388 // scope. Declarations in different scopes have completely 389 // distinct sets of default arguments. That is, declarations in 390 // inner scopes do not acquire default arguments from 391 // declarations in outer scopes, and vice versa. In a given 392 // function declaration, all parameters subsequent to a 393 // parameter with a default argument shall have default 394 // arguments supplied in this or previous declarations. A 395 // default argument shall not be redefined by a later 396 // declaration (not even to the same value). 397 // 398 // C++ [dcl.fct.default]p6: 399 // Except for member functions of class templates, the default arguments 400 // in a member function definition that appears outside of the class 401 // definition are added to the set of default arguments provided by the 402 // member function declaration in the class definition. 403 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 404 ParmVarDecl *OldParam = Old->getParamDecl(p); 405 ParmVarDecl *NewParam = New->getParamDecl(p); 406 407 bool OldParamHasDfl = OldParam->hasDefaultArg(); 408 bool NewParamHasDfl = NewParam->hasDefaultArg(); 409 410 NamedDecl *ND = Old; 411 if (S && !isDeclInScope(ND, New->getDeclContext(), S)) 412 // Ignore default parameters of old decl if they are not in 413 // the same scope. 414 OldParamHasDfl = false; 415 416 if (OldParamHasDfl && NewParamHasDfl) { 417 418 unsigned DiagDefaultParamID = 419 diag::err_param_default_argument_redefinition; 420 421 // MSVC accepts that default parameters be redefined for member functions 422 // of template class. The new default parameter's value is ignored. 423 Invalid = true; 424 if (getLangOpts().MicrosoftExt) { 425 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 426 if (MD && MD->getParent()->getDescribedClassTemplate()) { 427 // Merge the old default argument into the new parameter. 428 NewParam->setHasInheritedDefaultArg(); 429 if (OldParam->hasUninstantiatedDefaultArg()) 430 NewParam->setUninstantiatedDefaultArg( 431 OldParam->getUninstantiatedDefaultArg()); 432 else 433 NewParam->setDefaultArg(OldParam->getInit()); 434 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 435 Invalid = false; 436 } 437 } 438 439 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 440 // hint here. Alternatively, we could walk the type-source information 441 // for NewParam to find the last source location in the type... but it 442 // isn't worth the effort right now. This is the kind of test case that 443 // is hard to get right: 444 // int f(int); 445 // void g(int (*fp)(int) = f); 446 // void g(int (*fp)(int) = &f); 447 Diag(NewParam->getLocation(), DiagDefaultParamID) 448 << NewParam->getDefaultArgRange(); 449 450 // Look for the function declaration where the default argument was 451 // actually written, which may be a declaration prior to Old. 452 for (FunctionDecl *Older = Old->getPreviousDecl(); 453 Older; Older = Older->getPreviousDecl()) { 454 if (!Older->getParamDecl(p)->hasDefaultArg()) 455 break; 456 457 OldParam = Older->getParamDecl(p); 458 } 459 460 Diag(OldParam->getLocation(), diag::note_previous_definition) 461 << OldParam->getDefaultArgRange(); 462 } else if (OldParamHasDfl) { 463 // Merge the old default argument into the new parameter. 464 // It's important to use getInit() here; getDefaultArg() 465 // strips off any top-level ExprWithCleanups. 466 NewParam->setHasInheritedDefaultArg(); 467 if (OldParam->hasUninstantiatedDefaultArg()) 468 NewParam->setUninstantiatedDefaultArg( 469 OldParam->getUninstantiatedDefaultArg()); 470 else 471 NewParam->setDefaultArg(OldParam->getInit()); 472 } else if (NewParamHasDfl) { 473 if (New->getDescribedFunctionTemplate()) { 474 // Paragraph 4, quoted above, only applies to non-template functions. 475 Diag(NewParam->getLocation(), 476 diag::err_param_default_argument_template_redecl) 477 << NewParam->getDefaultArgRange(); 478 Diag(Old->getLocation(), diag::note_template_prev_declaration) 479 << false; 480 } else if (New->getTemplateSpecializationKind() 481 != TSK_ImplicitInstantiation && 482 New->getTemplateSpecializationKind() != TSK_Undeclared) { 483 // C++ [temp.expr.spec]p21: 484 // Default function arguments shall not be specified in a declaration 485 // or a definition for one of the following explicit specializations: 486 // - the explicit specialization of a function template; 487 // - the explicit specialization of a member function template; 488 // - the explicit specialization of a member function of a class 489 // template where the class template specialization to which the 490 // member function specialization belongs is implicitly 491 // instantiated. 492 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 493 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 494 << New->getDeclName() 495 << NewParam->getDefaultArgRange(); 496 } else if (New->getDeclContext()->isDependentContext()) { 497 // C++ [dcl.fct.default]p6 (DR217): 498 // Default arguments for a member function of a class template shall 499 // be specified on the initial declaration of the member function 500 // within the class template. 501 // 502 // Reading the tea leaves a bit in DR217 and its reference to DR205 503 // leads me to the conclusion that one cannot add default function 504 // arguments for an out-of-line definition of a member function of a 505 // dependent type. 506 int WhichKind = 2; 507 if (CXXRecordDecl *Record 508 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 509 if (Record->getDescribedClassTemplate()) 510 WhichKind = 0; 511 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 512 WhichKind = 1; 513 else 514 WhichKind = 2; 515 } 516 517 Diag(NewParam->getLocation(), 518 diag::err_param_default_argument_member_template_redecl) 519 << WhichKind 520 << NewParam->getDefaultArgRange(); 521 } else if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(New)) { 522 CXXSpecialMember NewSM = getSpecialMember(Ctor), 523 OldSM = getSpecialMember(cast<CXXConstructorDecl>(Old)); 524 if (NewSM != OldSM) { 525 Diag(NewParam->getLocation(),diag::warn_default_arg_makes_ctor_special) 526 << NewParam->getDefaultArgRange() << NewSM; 527 Diag(Old->getLocation(), diag::note_previous_declaration_special) 528 << OldSM; 529 } 530 } 531 } 532 } 533 534 // C++11 [dcl.constexpr]p1: If any declaration of a function or function 535 // template has a constexpr specifier then all its declarations shall 536 // contain the constexpr specifier. 537 if (New->isConstexpr() != Old->isConstexpr()) { 538 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 539 << New << New->isConstexpr(); 540 Diag(Old->getLocation(), diag::note_previous_declaration); 541 Invalid = true; 542 } 543 544 if (CheckEquivalentExceptionSpec(Old, New)) 545 Invalid = true; 546 547 return Invalid; 548} 549 550/// \brief Merge the exception specifications of two variable declarations. 551/// 552/// This is called when there's a redeclaration of a VarDecl. The function 553/// checks if the redeclaration might have an exception specification and 554/// validates compatibility and merges the specs if necessary. 555void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 556 // Shortcut if exceptions are disabled. 557 if (!getLangOpts().CXXExceptions) 558 return; 559 560 assert(Context.hasSameType(New->getType(), Old->getType()) && 561 "Should only be called if types are otherwise the same."); 562 563 QualType NewType = New->getType(); 564 QualType OldType = Old->getType(); 565 566 // We're only interested in pointers and references to functions, as well 567 // as pointers to member functions. 568 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 569 NewType = R->getPointeeType(); 570 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 571 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 572 NewType = P->getPointeeType(); 573 OldType = OldType->getAs<PointerType>()->getPointeeType(); 574 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 575 NewType = M->getPointeeType(); 576 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 577 } 578 579 if (!NewType->isFunctionProtoType()) 580 return; 581 582 // There's lots of special cases for functions. For function pointers, system 583 // libraries are hopefully not as broken so that we don't need these 584 // workarounds. 585 if (CheckEquivalentExceptionSpec( 586 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 587 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 588 New->setInvalidDecl(); 589 } 590} 591 592/// CheckCXXDefaultArguments - Verify that the default arguments for a 593/// function declaration are well-formed according to C++ 594/// [dcl.fct.default]. 595void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 596 unsigned NumParams = FD->getNumParams(); 597 unsigned p; 598 599 bool IsLambda = FD->getOverloadedOperator() == OO_Call && 600 isa<CXXMethodDecl>(FD) && 601 cast<CXXMethodDecl>(FD)->getParent()->isLambda(); 602 603 // Find first parameter with a default argument 604 for (p = 0; p < NumParams; ++p) { 605 ParmVarDecl *Param = FD->getParamDecl(p); 606 if (Param->hasDefaultArg()) { 607 // C++11 [expr.prim.lambda]p5: 608 // [...] Default arguments (8.3.6) shall not be specified in the 609 // parameter-declaration-clause of a lambda-declarator. 610 // 611 // FIXME: Core issue 974 strikes this sentence, we only provide an 612 // extension warning. 613 if (IsLambda) 614 Diag(Param->getLocation(), diag::ext_lambda_default_arguments) 615 << Param->getDefaultArgRange(); 616 break; 617 } 618 } 619 620 // C++ [dcl.fct.default]p4: 621 // In a given function declaration, all parameters 622 // subsequent to a parameter with a default argument shall 623 // have default arguments supplied in this or previous 624 // declarations. A default argument shall not be redefined 625 // by a later declaration (not even to the same value). 626 unsigned LastMissingDefaultArg = 0; 627 for (; p < NumParams; ++p) { 628 ParmVarDecl *Param = FD->getParamDecl(p); 629 if (!Param->hasDefaultArg()) { 630 if (Param->isInvalidDecl()) 631 /* We already complained about this parameter. */; 632 else if (Param->getIdentifier()) 633 Diag(Param->getLocation(), 634 diag::err_param_default_argument_missing_name) 635 << Param->getIdentifier(); 636 else 637 Diag(Param->getLocation(), 638 diag::err_param_default_argument_missing); 639 640 LastMissingDefaultArg = p; 641 } 642 } 643 644 if (LastMissingDefaultArg > 0) { 645 // Some default arguments were missing. Clear out all of the 646 // default arguments up to (and including) the last missing 647 // default argument, so that we leave the function parameters 648 // in a semantically valid state. 649 for (p = 0; p <= LastMissingDefaultArg; ++p) { 650 ParmVarDecl *Param = FD->getParamDecl(p); 651 if (Param->hasDefaultArg()) { 652 Param->setDefaultArg(0); 653 } 654 } 655 } 656} 657 658// CheckConstexprParameterTypes - Check whether a function's parameter types 659// are all literal types. If so, return true. If not, produce a suitable 660// diagnostic and return false. 661static bool CheckConstexprParameterTypes(Sema &SemaRef, 662 const FunctionDecl *FD) { 663 unsigned ArgIndex = 0; 664 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 665 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 666 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 667 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 668 SourceLocation ParamLoc = PD->getLocation(); 669 if (!(*i)->isDependentType() && 670 SemaRef.RequireLiteralType(ParamLoc, *i, 671 diag::err_constexpr_non_literal_param, 672 ArgIndex+1, PD->getSourceRange(), 673 isa<CXXConstructorDecl>(FD))) 674 return false; 675 } 676 return true; 677} 678 679// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 680// the requirements of a constexpr function definition or a constexpr 681// constructor definition. If so, return true. If not, produce appropriate 682// diagnostics and return false. 683// 684// This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. 685bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) { 686 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 687 if (MD && MD->isInstance()) { 688 // C++11 [dcl.constexpr]p4: 689 // The definition of a constexpr constructor shall satisfy the following 690 // constraints: 691 // - the class shall not have any virtual base classes; 692 const CXXRecordDecl *RD = MD->getParent(); 693 if (RD->getNumVBases()) { 694 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) 695 << isa<CXXConstructorDecl>(NewFD) << RD->isStruct() 696 << RD->getNumVBases(); 697 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 698 E = RD->vbases_end(); I != E; ++I) 699 Diag(I->getLocStart(), 700 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 701 return false; 702 } 703 } 704 705 if (!isa<CXXConstructorDecl>(NewFD)) { 706 // C++11 [dcl.constexpr]p3: 707 // The definition of a constexpr function shall satisfy the following 708 // constraints: 709 // - it shall not be virtual; 710 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 711 if (Method && Method->isVirtual()) { 712 Diag(NewFD->getLocation(), diag::err_constexpr_virtual); 713 714 // If it's not obvious why this function is virtual, find an overridden 715 // function which uses the 'virtual' keyword. 716 const CXXMethodDecl *WrittenVirtual = Method; 717 while (!WrittenVirtual->isVirtualAsWritten()) 718 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 719 if (WrittenVirtual != Method) 720 Diag(WrittenVirtual->getLocation(), 721 diag::note_overridden_virtual_function); 722 return false; 723 } 724 725 // - its return type shall be a literal type; 726 QualType RT = NewFD->getResultType(); 727 if (!RT->isDependentType() && 728 RequireLiteralType(NewFD->getLocation(), RT, 729 diag::err_constexpr_non_literal_return)) 730 return false; 731 } 732 733 // - each of its parameter types shall be a literal type; 734 if (!CheckConstexprParameterTypes(*this, NewFD)) 735 return false; 736 737 return true; 738} 739 740/// Check the given declaration statement is legal within a constexpr function 741/// body. C++0x [dcl.constexpr]p3,p4. 742/// 743/// \return true if the body is OK, false if we have diagnosed a problem. 744static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 745 DeclStmt *DS) { 746 // C++0x [dcl.constexpr]p3 and p4: 747 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 748 // contain only 749 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 750 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 751 switch ((*DclIt)->getKind()) { 752 case Decl::StaticAssert: 753 case Decl::Using: 754 case Decl::UsingShadow: 755 case Decl::UsingDirective: 756 case Decl::UnresolvedUsingTypename: 757 // - static_assert-declarations 758 // - using-declarations, 759 // - using-directives, 760 continue; 761 762 case Decl::Typedef: 763 case Decl::TypeAlias: { 764 // - typedef declarations and alias-declarations that do not define 765 // classes or enumerations, 766 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 767 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 768 // Don't allow variably-modified types in constexpr functions. 769 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 770 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 771 << TL.getSourceRange() << TL.getType() 772 << isa<CXXConstructorDecl>(Dcl); 773 return false; 774 } 775 continue; 776 } 777 778 case Decl::Enum: 779 case Decl::CXXRecord: 780 // As an extension, we allow the declaration (but not the definition) of 781 // classes and enumerations in all declarations, not just in typedef and 782 // alias declarations. 783 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 784 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 785 << isa<CXXConstructorDecl>(Dcl); 786 return false; 787 } 788 continue; 789 790 case Decl::Var: 791 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 792 << isa<CXXConstructorDecl>(Dcl); 793 return false; 794 795 default: 796 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 797 << isa<CXXConstructorDecl>(Dcl); 798 return false; 799 } 800 } 801 802 return true; 803} 804 805/// Check that the given field is initialized within a constexpr constructor. 806/// 807/// \param Dcl The constexpr constructor being checked. 808/// \param Field The field being checked. This may be a member of an anonymous 809/// struct or union nested within the class being checked. 810/// \param Inits All declarations, including anonymous struct/union members and 811/// indirect members, for which any initialization was provided. 812/// \param Diagnosed Set to true if an error is produced. 813static void CheckConstexprCtorInitializer(Sema &SemaRef, 814 const FunctionDecl *Dcl, 815 FieldDecl *Field, 816 llvm::SmallSet<Decl*, 16> &Inits, 817 bool &Diagnosed) { 818 if (Field->isUnnamedBitfield()) 819 return; 820 821 if (Field->isAnonymousStructOrUnion() && 822 Field->getType()->getAsCXXRecordDecl()->isEmpty()) 823 return; 824 825 if (!Inits.count(Field)) { 826 if (!Diagnosed) { 827 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 828 Diagnosed = true; 829 } 830 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 831 } else if (Field->isAnonymousStructOrUnion()) { 832 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 833 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 834 I != E; ++I) 835 // If an anonymous union contains an anonymous struct of which any member 836 // is initialized, all members must be initialized. 837 if (!RD->isUnion() || Inits.count(*I)) 838 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 839 } 840} 841 842/// Check the body for the given constexpr function declaration only contains 843/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 844/// 845/// \return true if the body is OK, false if we have diagnosed a problem. 846bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 847 if (isa<CXXTryStmt>(Body)) { 848 // C++11 [dcl.constexpr]p3: 849 // The definition of a constexpr function shall satisfy the following 850 // constraints: [...] 851 // - its function-body shall be = delete, = default, or a 852 // compound-statement 853 // 854 // C++11 [dcl.constexpr]p4: 855 // In the definition of a constexpr constructor, [...] 856 // - its function-body shall not be a function-try-block; 857 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 858 << isa<CXXConstructorDecl>(Dcl); 859 return false; 860 } 861 862 // - its function-body shall be [...] a compound-statement that contains only 863 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 864 865 llvm::SmallVector<SourceLocation, 4> ReturnStmts; 866 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 867 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 868 switch ((*BodyIt)->getStmtClass()) { 869 case Stmt::NullStmtClass: 870 // - null statements, 871 continue; 872 873 case Stmt::DeclStmtClass: 874 // - static_assert-declarations 875 // - using-declarations, 876 // - using-directives, 877 // - typedef declarations and alias-declarations that do not define 878 // classes or enumerations, 879 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 880 return false; 881 continue; 882 883 case Stmt::ReturnStmtClass: 884 // - and exactly one return statement; 885 if (isa<CXXConstructorDecl>(Dcl)) 886 break; 887 888 ReturnStmts.push_back((*BodyIt)->getLocStart()); 889 continue; 890 891 default: 892 break; 893 } 894 895 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 896 << isa<CXXConstructorDecl>(Dcl); 897 return false; 898 } 899 900 if (const CXXConstructorDecl *Constructor 901 = dyn_cast<CXXConstructorDecl>(Dcl)) { 902 const CXXRecordDecl *RD = Constructor->getParent(); 903 // DR1359: 904 // - every non-variant non-static data member and base class sub-object 905 // shall be initialized; 906 // - if the class is a non-empty union, or for each non-empty anonymous 907 // union member of a non-union class, exactly one non-static data member 908 // shall be initialized; 909 if (RD->isUnion()) { 910 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) { 911 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 912 return false; 913 } 914 } else if (!Constructor->isDependentContext() && 915 !Constructor->isDelegatingConstructor()) { 916 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 917 918 // Skip detailed checking if we have enough initializers, and we would 919 // allow at most one initializer per member. 920 bool AnyAnonStructUnionMembers = false; 921 unsigned Fields = 0; 922 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 923 E = RD->field_end(); I != E; ++I, ++Fields) { 924 if (I->isAnonymousStructOrUnion()) { 925 AnyAnonStructUnionMembers = true; 926 break; 927 } 928 } 929 if (AnyAnonStructUnionMembers || 930 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 931 // Check initialization of non-static data members. Base classes are 932 // always initialized so do not need to be checked. Dependent bases 933 // might not have initializers in the member initializer list. 934 llvm::SmallSet<Decl*, 16> Inits; 935 for (CXXConstructorDecl::init_const_iterator 936 I = Constructor->init_begin(), E = Constructor->init_end(); 937 I != E; ++I) { 938 if (FieldDecl *FD = (*I)->getMember()) 939 Inits.insert(FD); 940 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 941 Inits.insert(ID->chain_begin(), ID->chain_end()); 942 } 943 944 bool Diagnosed = false; 945 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 946 E = RD->field_end(); I != E; ++I) 947 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 948 if (Diagnosed) 949 return false; 950 } 951 } 952 } else { 953 if (ReturnStmts.empty()) { 954 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 955 return false; 956 } 957 if (ReturnStmts.size() > 1) { 958 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 959 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 960 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 961 return false; 962 } 963 } 964 965 // C++11 [dcl.constexpr]p5: 966 // if no function argument values exist such that the function invocation 967 // substitution would produce a constant expression, the program is 968 // ill-formed; no diagnostic required. 969 // C++11 [dcl.constexpr]p3: 970 // - every constructor call and implicit conversion used in initializing the 971 // return value shall be one of those allowed in a constant expression. 972 // C++11 [dcl.constexpr]p4: 973 // - every constructor involved in initializing non-static data members and 974 // base class sub-objects shall be a constexpr constructor. 975 llvm::SmallVector<PartialDiagnosticAt, 8> Diags; 976 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) { 977 Diag(Dcl->getLocation(), diag::err_constexpr_function_never_constant_expr) 978 << isa<CXXConstructorDecl>(Dcl); 979 for (size_t I = 0, N = Diags.size(); I != N; ++I) 980 Diag(Diags[I].first, Diags[I].second); 981 return false; 982 } 983 984 return true; 985} 986 987/// isCurrentClassName - Determine whether the identifier II is the 988/// name of the class type currently being defined. In the case of 989/// nested classes, this will only return true if II is the name of 990/// the innermost class. 991bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 992 const CXXScopeSpec *SS) { 993 assert(getLangOpts().CPlusPlus && "No class names in C!"); 994 995 CXXRecordDecl *CurDecl; 996 if (SS && SS->isSet() && !SS->isInvalid()) { 997 DeclContext *DC = computeDeclContext(*SS, true); 998 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 999 } else 1000 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 1001 1002 if (CurDecl && CurDecl->getIdentifier()) 1003 return &II == CurDecl->getIdentifier(); 1004 else 1005 return false; 1006} 1007 1008/// \brief Check the validity of a C++ base class specifier. 1009/// 1010/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1011/// and returns NULL otherwise. 1012CXXBaseSpecifier * 1013Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1014 SourceRange SpecifierRange, 1015 bool Virtual, AccessSpecifier Access, 1016 TypeSourceInfo *TInfo, 1017 SourceLocation EllipsisLoc) { 1018 QualType BaseType = TInfo->getType(); 1019 1020 // C++ [class.union]p1: 1021 // A union shall not have base classes. 1022 if (Class->isUnion()) { 1023 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1024 << SpecifierRange; 1025 return 0; 1026 } 1027 1028 if (EllipsisLoc.isValid() && 1029 !TInfo->getType()->containsUnexpandedParameterPack()) { 1030 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1031 << TInfo->getTypeLoc().getSourceRange(); 1032 EllipsisLoc = SourceLocation(); 1033 } 1034 1035 if (BaseType->isDependentType()) 1036 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1037 Class->getTagKind() == TTK_Class, 1038 Access, TInfo, EllipsisLoc); 1039 1040 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1041 1042 // Base specifiers must be record types. 1043 if (!BaseType->isRecordType()) { 1044 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1045 return 0; 1046 } 1047 1048 // C++ [class.union]p1: 1049 // A union shall not be used as a base class. 1050 if (BaseType->isUnionType()) { 1051 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1052 return 0; 1053 } 1054 1055 // C++ [class.derived]p2: 1056 // The class-name in a base-specifier shall not be an incompletely 1057 // defined class. 1058 if (RequireCompleteType(BaseLoc, BaseType, 1059 diag::err_incomplete_base_class, SpecifierRange)) { 1060 Class->setInvalidDecl(); 1061 return 0; 1062 } 1063 1064 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1065 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1066 assert(BaseDecl && "Record type has no declaration"); 1067 BaseDecl = BaseDecl->getDefinition(); 1068 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1069 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1070 assert(CXXBaseDecl && "Base type is not a C++ type"); 1071 1072 // C++ [class]p3: 1073 // If a class is marked final and it appears as a base-type-specifier in 1074 // base-clause, the program is ill-formed. 1075 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1076 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1077 << CXXBaseDecl->getDeclName(); 1078 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1079 << CXXBaseDecl->getDeclName(); 1080 return 0; 1081 } 1082 1083 if (BaseDecl->isInvalidDecl()) 1084 Class->setInvalidDecl(); 1085 1086 // Create the base specifier. 1087 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1088 Class->getTagKind() == TTK_Class, 1089 Access, TInfo, EllipsisLoc); 1090} 1091 1092/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1093/// one entry in the base class list of a class specifier, for 1094/// example: 1095/// class foo : public bar, virtual private baz { 1096/// 'public bar' and 'virtual private baz' are each base-specifiers. 1097BaseResult 1098Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1099 bool Virtual, AccessSpecifier Access, 1100 ParsedType basetype, SourceLocation BaseLoc, 1101 SourceLocation EllipsisLoc) { 1102 if (!classdecl) 1103 return true; 1104 1105 AdjustDeclIfTemplate(classdecl); 1106 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1107 if (!Class) 1108 return true; 1109 1110 TypeSourceInfo *TInfo = 0; 1111 GetTypeFromParser(basetype, &TInfo); 1112 1113 if (EllipsisLoc.isInvalid() && 1114 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1115 UPPC_BaseType)) 1116 return true; 1117 1118 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1119 Virtual, Access, TInfo, 1120 EllipsisLoc)) 1121 return BaseSpec; 1122 else 1123 Class->setInvalidDecl(); 1124 1125 return true; 1126} 1127 1128/// \brief Performs the actual work of attaching the given base class 1129/// specifiers to a C++ class. 1130bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1131 unsigned NumBases) { 1132 if (NumBases == 0) 1133 return false; 1134 1135 // Used to keep track of which base types we have already seen, so 1136 // that we can properly diagnose redundant direct base types. Note 1137 // that the key is always the unqualified canonical type of the base 1138 // class. 1139 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1140 1141 // Copy non-redundant base specifiers into permanent storage. 1142 unsigned NumGoodBases = 0; 1143 bool Invalid = false; 1144 for (unsigned idx = 0; idx < NumBases; ++idx) { 1145 QualType NewBaseType 1146 = Context.getCanonicalType(Bases[idx]->getType()); 1147 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1148 1149 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; 1150 if (KnownBase) { 1151 // C++ [class.mi]p3: 1152 // A class shall not be specified as a direct base class of a 1153 // derived class more than once. 1154 Diag(Bases[idx]->getLocStart(), 1155 diag::err_duplicate_base_class) 1156 << KnownBase->getType() 1157 << Bases[idx]->getSourceRange(); 1158 1159 // Delete the duplicate base class specifier; we're going to 1160 // overwrite its pointer later. 1161 Context.Deallocate(Bases[idx]); 1162 1163 Invalid = true; 1164 } else { 1165 // Okay, add this new base class. 1166 KnownBase = Bases[idx]; 1167 Bases[NumGoodBases++] = Bases[idx]; 1168 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) 1169 if (const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl())) 1170 if (RD->hasAttr<WeakAttr>()) 1171 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1172 } 1173 } 1174 1175 // Attach the remaining base class specifiers to the derived class. 1176 Class->setBases(Bases, NumGoodBases); 1177 1178 // Delete the remaining (good) base class specifiers, since their 1179 // data has been copied into the CXXRecordDecl. 1180 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1181 Context.Deallocate(Bases[idx]); 1182 1183 return Invalid; 1184} 1185 1186/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1187/// class, after checking whether there are any duplicate base 1188/// classes. 1189void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1190 unsigned NumBases) { 1191 if (!ClassDecl || !Bases || !NumBases) 1192 return; 1193 1194 AdjustDeclIfTemplate(ClassDecl); 1195 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1196 (CXXBaseSpecifier**)(Bases), NumBases); 1197} 1198 1199static CXXRecordDecl *GetClassForType(QualType T) { 1200 if (const RecordType *RT = T->getAs<RecordType>()) 1201 return cast<CXXRecordDecl>(RT->getDecl()); 1202 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1203 return ICT->getDecl(); 1204 else 1205 return 0; 1206} 1207 1208/// \brief Determine whether the type \p Derived is a C++ class that is 1209/// derived from the type \p Base. 1210bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1211 if (!getLangOpts().CPlusPlus) 1212 return false; 1213 1214 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1215 if (!DerivedRD) 1216 return false; 1217 1218 CXXRecordDecl *BaseRD = GetClassForType(Base); 1219 if (!BaseRD) 1220 return false; 1221 1222 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1223 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1224} 1225 1226/// \brief Determine whether the type \p Derived is a C++ class that is 1227/// derived from the type \p Base. 1228bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1229 if (!getLangOpts().CPlusPlus) 1230 return false; 1231 1232 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1233 if (!DerivedRD) 1234 return false; 1235 1236 CXXRecordDecl *BaseRD = GetClassForType(Base); 1237 if (!BaseRD) 1238 return false; 1239 1240 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1241} 1242 1243void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1244 CXXCastPath &BasePathArray) { 1245 assert(BasePathArray.empty() && "Base path array must be empty!"); 1246 assert(Paths.isRecordingPaths() && "Must record paths!"); 1247 1248 const CXXBasePath &Path = Paths.front(); 1249 1250 // We first go backward and check if we have a virtual base. 1251 // FIXME: It would be better if CXXBasePath had the base specifier for 1252 // the nearest virtual base. 1253 unsigned Start = 0; 1254 for (unsigned I = Path.size(); I != 0; --I) { 1255 if (Path[I - 1].Base->isVirtual()) { 1256 Start = I - 1; 1257 break; 1258 } 1259 } 1260 1261 // Now add all bases. 1262 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1263 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1264} 1265 1266/// \brief Determine whether the given base path includes a virtual 1267/// base class. 1268bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1269 for (CXXCastPath::const_iterator B = BasePath.begin(), 1270 BEnd = BasePath.end(); 1271 B != BEnd; ++B) 1272 if ((*B)->isVirtual()) 1273 return true; 1274 1275 return false; 1276} 1277 1278/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1279/// conversion (where Derived and Base are class types) is 1280/// well-formed, meaning that the conversion is unambiguous (and 1281/// that all of the base classes are accessible). Returns true 1282/// and emits a diagnostic if the code is ill-formed, returns false 1283/// otherwise. Loc is the location where this routine should point to 1284/// if there is an error, and Range is the source range to highlight 1285/// if there is an error. 1286bool 1287Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1288 unsigned InaccessibleBaseID, 1289 unsigned AmbigiousBaseConvID, 1290 SourceLocation Loc, SourceRange Range, 1291 DeclarationName Name, 1292 CXXCastPath *BasePath) { 1293 // First, determine whether the path from Derived to Base is 1294 // ambiguous. This is slightly more expensive than checking whether 1295 // the Derived to Base conversion exists, because here we need to 1296 // explore multiple paths to determine if there is an ambiguity. 1297 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1298 /*DetectVirtual=*/false); 1299 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1300 assert(DerivationOkay && 1301 "Can only be used with a derived-to-base conversion"); 1302 (void)DerivationOkay; 1303 1304 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1305 if (InaccessibleBaseID) { 1306 // Check that the base class can be accessed. 1307 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1308 InaccessibleBaseID)) { 1309 case AR_inaccessible: 1310 return true; 1311 case AR_accessible: 1312 case AR_dependent: 1313 case AR_delayed: 1314 break; 1315 } 1316 } 1317 1318 // Build a base path if necessary. 1319 if (BasePath) 1320 BuildBasePathArray(Paths, *BasePath); 1321 return false; 1322 } 1323 1324 // We know that the derived-to-base conversion is ambiguous, and 1325 // we're going to produce a diagnostic. Perform the derived-to-base 1326 // search just one more time to compute all of the possible paths so 1327 // that we can print them out. This is more expensive than any of 1328 // the previous derived-to-base checks we've done, but at this point 1329 // performance isn't as much of an issue. 1330 Paths.clear(); 1331 Paths.setRecordingPaths(true); 1332 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1333 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1334 (void)StillOkay; 1335 1336 // Build up a textual representation of the ambiguous paths, e.g., 1337 // D -> B -> A, that will be used to illustrate the ambiguous 1338 // conversions in the diagnostic. We only print one of the paths 1339 // to each base class subobject. 1340 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1341 1342 Diag(Loc, AmbigiousBaseConvID) 1343 << Derived << Base << PathDisplayStr << Range << Name; 1344 return true; 1345} 1346 1347bool 1348Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1349 SourceLocation Loc, SourceRange Range, 1350 CXXCastPath *BasePath, 1351 bool IgnoreAccess) { 1352 return CheckDerivedToBaseConversion(Derived, Base, 1353 IgnoreAccess ? 0 1354 : diag::err_upcast_to_inaccessible_base, 1355 diag::err_ambiguous_derived_to_base_conv, 1356 Loc, Range, DeclarationName(), 1357 BasePath); 1358} 1359 1360 1361/// @brief Builds a string representing ambiguous paths from a 1362/// specific derived class to different subobjects of the same base 1363/// class. 1364/// 1365/// This function builds a string that can be used in error messages 1366/// to show the different paths that one can take through the 1367/// inheritance hierarchy to go from the derived class to different 1368/// subobjects of a base class. The result looks something like this: 1369/// @code 1370/// struct D -> struct B -> struct A 1371/// struct D -> struct C -> struct A 1372/// @endcode 1373std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1374 std::string PathDisplayStr; 1375 std::set<unsigned> DisplayedPaths; 1376 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1377 Path != Paths.end(); ++Path) { 1378 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1379 // We haven't displayed a path to this particular base 1380 // class subobject yet. 1381 PathDisplayStr += "\n "; 1382 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1383 for (CXXBasePath::const_iterator Element = Path->begin(); 1384 Element != Path->end(); ++Element) 1385 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1386 } 1387 } 1388 1389 return PathDisplayStr; 1390} 1391 1392//===----------------------------------------------------------------------===// 1393// C++ class member Handling 1394//===----------------------------------------------------------------------===// 1395 1396/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1397bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1398 SourceLocation ASLoc, 1399 SourceLocation ColonLoc, 1400 AttributeList *Attrs) { 1401 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1402 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1403 ASLoc, ColonLoc); 1404 CurContext->addHiddenDecl(ASDecl); 1405 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1406} 1407 1408/// CheckOverrideControl - Check C++0x override control semantics. 1409void Sema::CheckOverrideControl(const Decl *D) { 1410 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1411 if (!MD || !MD->isVirtual()) 1412 return; 1413 1414 if (MD->isDependentContext()) 1415 return; 1416 1417 // C++0x [class.virtual]p3: 1418 // If a virtual function is marked with the virt-specifier override and does 1419 // not override a member function of a base class, 1420 // the program is ill-formed. 1421 bool HasOverriddenMethods = 1422 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1423 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1424 Diag(MD->getLocation(), 1425 diag::err_function_marked_override_not_overriding) 1426 << MD->getDeclName(); 1427 return; 1428 } 1429} 1430 1431/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1432/// function overrides a virtual member function marked 'final', according to 1433/// C++0x [class.virtual]p3. 1434bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1435 const CXXMethodDecl *Old) { 1436 if (!Old->hasAttr<FinalAttr>()) 1437 return false; 1438 1439 Diag(New->getLocation(), diag::err_final_function_overridden) 1440 << New->getDeclName(); 1441 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1442 return true; 1443} 1444 1445static bool InitializationHasSideEffects(const FieldDecl &FD) { 1446 if (!FD.getType().isNull()) { 1447 if (const CXXRecordDecl *RD = FD.getType()->getAsCXXRecordDecl()) { 1448 return !RD->isCompleteDefinition() || 1449 !RD->hasTrivialDefaultConstructor() || 1450 !RD->hasTrivialDestructor(); 1451 } 1452 } 1453 return false; 1454} 1455 1456/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1457/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1458/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1459/// one has been parsed, and 'InitStyle' is set if an in-class initializer is 1460/// present (but parsing it has been deferred). 1461Decl * 1462Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1463 MultiTemplateParamsArg TemplateParameterLists, 1464 Expr *BW, const VirtSpecifiers &VS, 1465 InClassInitStyle InitStyle) { 1466 const DeclSpec &DS = D.getDeclSpec(); 1467 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1468 DeclarationName Name = NameInfo.getName(); 1469 SourceLocation Loc = NameInfo.getLoc(); 1470 1471 // For anonymous bitfields, the location should point to the type. 1472 if (Loc.isInvalid()) 1473 Loc = D.getLocStart(); 1474 1475 Expr *BitWidth = static_cast<Expr*>(BW); 1476 1477 assert(isa<CXXRecordDecl>(CurContext)); 1478 assert(!DS.isFriendSpecified()); 1479 1480 bool isFunc = D.isDeclarationOfFunction(); 1481 1482 // C++ 9.2p6: A member shall not be declared to have automatic storage 1483 // duration (auto, register) or with the extern storage-class-specifier. 1484 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1485 // data members and cannot be applied to names declared const or static, 1486 // and cannot be applied to reference members. 1487 switch (DS.getStorageClassSpec()) { 1488 case DeclSpec::SCS_unspecified: 1489 case DeclSpec::SCS_typedef: 1490 case DeclSpec::SCS_static: 1491 // FALL THROUGH. 1492 break; 1493 case DeclSpec::SCS_mutable: 1494 if (isFunc) { 1495 if (DS.getStorageClassSpecLoc().isValid()) 1496 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1497 else 1498 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1499 1500 // FIXME: It would be nicer if the keyword was ignored only for this 1501 // declarator. Otherwise we could get follow-up errors. 1502 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1503 } 1504 break; 1505 default: 1506 if (DS.getStorageClassSpecLoc().isValid()) 1507 Diag(DS.getStorageClassSpecLoc(), 1508 diag::err_storageclass_invalid_for_member); 1509 else 1510 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1511 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1512 } 1513 1514 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1515 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1516 !isFunc); 1517 1518 Decl *Member; 1519 if (isInstField) { 1520 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1521 1522 // Data members must have identifiers for names. 1523 if (!Name.isIdentifier()) { 1524 Diag(Loc, diag::err_bad_variable_name) 1525 << Name; 1526 return 0; 1527 } 1528 1529 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1530 1531 // Member field could not be with "template" keyword. 1532 // So TemplateParameterLists should be empty in this case. 1533 if (TemplateParameterLists.size()) { 1534 TemplateParameterList* TemplateParams = TemplateParameterLists.get()[0]; 1535 if (TemplateParams->size()) { 1536 // There is no such thing as a member field template. 1537 Diag(D.getIdentifierLoc(), diag::err_template_member) 1538 << II 1539 << SourceRange(TemplateParams->getTemplateLoc(), 1540 TemplateParams->getRAngleLoc()); 1541 } else { 1542 // There is an extraneous 'template<>' for this member. 1543 Diag(TemplateParams->getTemplateLoc(), 1544 diag::err_template_member_noparams) 1545 << II 1546 << SourceRange(TemplateParams->getTemplateLoc(), 1547 TemplateParams->getRAngleLoc()); 1548 } 1549 return 0; 1550 } 1551 1552 if (SS.isSet() && !SS.isInvalid()) { 1553 // The user provided a superfluous scope specifier inside a class 1554 // definition: 1555 // 1556 // class X { 1557 // int X::member; 1558 // }; 1559 if (DeclContext *DC = computeDeclContext(SS, false)) 1560 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc()); 1561 else 1562 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1563 << Name << SS.getRange(); 1564 1565 SS.clear(); 1566 } 1567 1568 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1569 InitStyle, AS); 1570 assert(Member && "HandleField never returns null"); 1571 } else { 1572 assert(InitStyle == ICIS_NoInit); 1573 1574 Member = HandleDeclarator(S, D, move(TemplateParameterLists)); 1575 if (!Member) { 1576 return 0; 1577 } 1578 1579 // Non-instance-fields can't have a bitfield. 1580 if (BitWidth) { 1581 if (Member->isInvalidDecl()) { 1582 // don't emit another diagnostic. 1583 } else if (isa<VarDecl>(Member)) { 1584 // C++ 9.6p3: A bit-field shall not be a static member. 1585 // "static member 'A' cannot be a bit-field" 1586 Diag(Loc, diag::err_static_not_bitfield) 1587 << Name << BitWidth->getSourceRange(); 1588 } else if (isa<TypedefDecl>(Member)) { 1589 // "typedef member 'x' cannot be a bit-field" 1590 Diag(Loc, diag::err_typedef_not_bitfield) 1591 << Name << BitWidth->getSourceRange(); 1592 } else { 1593 // A function typedef ("typedef int f(); f a;"). 1594 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1595 Diag(Loc, diag::err_not_integral_type_bitfield) 1596 << Name << cast<ValueDecl>(Member)->getType() 1597 << BitWidth->getSourceRange(); 1598 } 1599 1600 BitWidth = 0; 1601 Member->setInvalidDecl(); 1602 } 1603 1604 Member->setAccess(AS); 1605 1606 // If we have declared a member function template, set the access of the 1607 // templated declaration as well. 1608 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1609 FunTmpl->getTemplatedDecl()->setAccess(AS); 1610 } 1611 1612 if (VS.isOverrideSpecified()) { 1613 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1614 if (!MD || !MD->isVirtual()) { 1615 Diag(Member->getLocStart(), 1616 diag::override_keyword_only_allowed_on_virtual_member_functions) 1617 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1618 } else 1619 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1620 } 1621 if (VS.isFinalSpecified()) { 1622 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1623 if (!MD || !MD->isVirtual()) { 1624 Diag(Member->getLocStart(), 1625 diag::override_keyword_only_allowed_on_virtual_member_functions) 1626 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1627 } else 1628 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1629 } 1630 1631 if (VS.getLastLocation().isValid()) { 1632 // Update the end location of a method that has a virt-specifiers. 1633 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1634 MD->setRangeEnd(VS.getLastLocation()); 1635 } 1636 1637 CheckOverrideControl(Member); 1638 1639 assert((Name || isInstField) && "No identifier for non-field ?"); 1640 1641 if (isInstField) { 1642 FieldDecl *FD = cast<FieldDecl>(Member); 1643 FieldCollector->Add(FD); 1644 1645 if (Diags.getDiagnosticLevel(diag::warn_unused_private_field, 1646 FD->getLocation()) 1647 != DiagnosticsEngine::Ignored) { 1648 // Remember all explicit private FieldDecls that have a name, no side 1649 // effects and are not part of a dependent type declaration. 1650 if (!FD->isImplicit() && FD->getDeclName() && 1651 FD->getAccess() == AS_private && 1652 !FD->hasAttr<UnusedAttr>() && 1653 !FD->getParent()->getTypeForDecl()->isDependentType() && 1654 !InitializationHasSideEffects(*FD)) 1655 UnusedPrivateFields.insert(FD); 1656 } 1657 } 1658 1659 return Member; 1660} 1661 1662/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1663/// in-class initializer for a non-static C++ class member, and after 1664/// instantiating an in-class initializer in a class template. Such actions 1665/// are deferred until the class is complete. 1666void 1667Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation InitLoc, 1668 Expr *InitExpr) { 1669 FieldDecl *FD = cast<FieldDecl>(D); 1670 assert(FD->getInClassInitStyle() != ICIS_NoInit && 1671 "must set init style when field is created"); 1672 1673 if (!InitExpr) { 1674 FD->setInvalidDecl(); 1675 FD->removeInClassInitializer(); 1676 return; 1677 } 1678 1679 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1680 FD->setInvalidDecl(); 1681 FD->removeInClassInitializer(); 1682 return; 1683 } 1684 1685 ExprResult Init = InitExpr; 1686 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1687 if (isa<InitListExpr>(InitExpr) && isStdInitializerList(FD->getType(), 0)) { 1688 Diag(FD->getLocation(), diag::warn_dangling_std_initializer_list) 1689 << /*at end of ctor*/1 << InitExpr->getSourceRange(); 1690 } 1691 Expr **Inits = &InitExpr; 1692 unsigned NumInits = 1; 1693 InitializedEntity Entity = InitializedEntity::InitializeMember(FD); 1694 InitializationKind Kind = FD->getInClassInitStyle() == ICIS_ListInit 1695 ? InitializationKind::CreateDirectList(InitExpr->getLocStart()) 1696 : InitializationKind::CreateCopy(InitExpr->getLocStart(), InitLoc); 1697 InitializationSequence Seq(*this, Entity, Kind, Inits, NumInits); 1698 Init = Seq.Perform(*this, Entity, Kind, MultiExprArg(Inits, NumInits)); 1699 if (Init.isInvalid()) { 1700 FD->setInvalidDecl(); 1701 return; 1702 } 1703 1704 CheckImplicitConversions(Init.get(), InitLoc); 1705 } 1706 1707 // C++0x [class.base.init]p7: 1708 // The initialization of each base and member constitutes a 1709 // full-expression. 1710 Init = MaybeCreateExprWithCleanups(Init); 1711 if (Init.isInvalid()) { 1712 FD->setInvalidDecl(); 1713 return; 1714 } 1715 1716 InitExpr = Init.release(); 1717 1718 FD->setInClassInitializer(InitExpr); 1719} 1720 1721/// \brief Find the direct and/or virtual base specifiers that 1722/// correspond to the given base type, for use in base initialization 1723/// within a constructor. 1724static bool FindBaseInitializer(Sema &SemaRef, 1725 CXXRecordDecl *ClassDecl, 1726 QualType BaseType, 1727 const CXXBaseSpecifier *&DirectBaseSpec, 1728 const CXXBaseSpecifier *&VirtualBaseSpec) { 1729 // First, check for a direct base class. 1730 DirectBaseSpec = 0; 1731 for (CXXRecordDecl::base_class_const_iterator Base 1732 = ClassDecl->bases_begin(); 1733 Base != ClassDecl->bases_end(); ++Base) { 1734 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1735 // We found a direct base of this type. That's what we're 1736 // initializing. 1737 DirectBaseSpec = &*Base; 1738 break; 1739 } 1740 } 1741 1742 // Check for a virtual base class. 1743 // FIXME: We might be able to short-circuit this if we know in advance that 1744 // there are no virtual bases. 1745 VirtualBaseSpec = 0; 1746 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1747 // We haven't found a base yet; search the class hierarchy for a 1748 // virtual base class. 1749 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1750 /*DetectVirtual=*/false); 1751 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1752 BaseType, Paths)) { 1753 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1754 Path != Paths.end(); ++Path) { 1755 if (Path->back().Base->isVirtual()) { 1756 VirtualBaseSpec = Path->back().Base; 1757 break; 1758 } 1759 } 1760 } 1761 } 1762 1763 return DirectBaseSpec || VirtualBaseSpec; 1764} 1765 1766/// \brief Handle a C++ member initializer using braced-init-list syntax. 1767MemInitResult 1768Sema::ActOnMemInitializer(Decl *ConstructorD, 1769 Scope *S, 1770 CXXScopeSpec &SS, 1771 IdentifierInfo *MemberOrBase, 1772 ParsedType TemplateTypeTy, 1773 const DeclSpec &DS, 1774 SourceLocation IdLoc, 1775 Expr *InitList, 1776 SourceLocation EllipsisLoc) { 1777 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1778 DS, IdLoc, InitList, 1779 EllipsisLoc); 1780} 1781 1782/// \brief Handle a C++ member initializer using parentheses syntax. 1783MemInitResult 1784Sema::ActOnMemInitializer(Decl *ConstructorD, 1785 Scope *S, 1786 CXXScopeSpec &SS, 1787 IdentifierInfo *MemberOrBase, 1788 ParsedType TemplateTypeTy, 1789 const DeclSpec &DS, 1790 SourceLocation IdLoc, 1791 SourceLocation LParenLoc, 1792 Expr **Args, unsigned NumArgs, 1793 SourceLocation RParenLoc, 1794 SourceLocation EllipsisLoc) { 1795 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1796 RParenLoc); 1797 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1798 DS, IdLoc, List, EllipsisLoc); 1799} 1800 1801namespace { 1802 1803// Callback to only accept typo corrections that can be a valid C++ member 1804// intializer: either a non-static field member or a base class. 1805class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 1806 public: 1807 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 1808 : ClassDecl(ClassDecl) {} 1809 1810 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 1811 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 1812 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 1813 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 1814 else 1815 return isa<TypeDecl>(ND); 1816 } 1817 return false; 1818 } 1819 1820 private: 1821 CXXRecordDecl *ClassDecl; 1822}; 1823 1824} 1825 1826/// \brief Handle a C++ member initializer. 1827MemInitResult 1828Sema::BuildMemInitializer(Decl *ConstructorD, 1829 Scope *S, 1830 CXXScopeSpec &SS, 1831 IdentifierInfo *MemberOrBase, 1832 ParsedType TemplateTypeTy, 1833 const DeclSpec &DS, 1834 SourceLocation IdLoc, 1835 Expr *Init, 1836 SourceLocation EllipsisLoc) { 1837 if (!ConstructorD) 1838 return true; 1839 1840 AdjustDeclIfTemplate(ConstructorD); 1841 1842 CXXConstructorDecl *Constructor 1843 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1844 if (!Constructor) { 1845 // The user wrote a constructor initializer on a function that is 1846 // not a C++ constructor. Ignore the error for now, because we may 1847 // have more member initializers coming; we'll diagnose it just 1848 // once in ActOnMemInitializers. 1849 return true; 1850 } 1851 1852 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1853 1854 // C++ [class.base.init]p2: 1855 // Names in a mem-initializer-id are looked up in the scope of the 1856 // constructor's class and, if not found in that scope, are looked 1857 // up in the scope containing the constructor's definition. 1858 // [Note: if the constructor's class contains a member with the 1859 // same name as a direct or virtual base class of the class, a 1860 // mem-initializer-id naming the member or base class and composed 1861 // of a single identifier refers to the class member. A 1862 // mem-initializer-id for the hidden base class may be specified 1863 // using a qualified name. ] 1864 if (!SS.getScopeRep() && !TemplateTypeTy) { 1865 // Look for a member, first. 1866 DeclContext::lookup_result Result 1867 = ClassDecl->lookup(MemberOrBase); 1868 if (Result.first != Result.second) { 1869 ValueDecl *Member; 1870 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 1871 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 1872 if (EllipsisLoc.isValid()) 1873 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1874 << MemberOrBase 1875 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 1876 1877 return BuildMemberInitializer(Member, Init, IdLoc); 1878 } 1879 } 1880 } 1881 // It didn't name a member, so see if it names a class. 1882 QualType BaseType; 1883 TypeSourceInfo *TInfo = 0; 1884 1885 if (TemplateTypeTy) { 1886 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1887 } else if (DS.getTypeSpecType() == TST_decltype) { 1888 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 1889 } else { 1890 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1891 LookupParsedName(R, S, &SS); 1892 1893 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1894 if (!TyD) { 1895 if (R.isAmbiguous()) return true; 1896 1897 // We don't want access-control diagnostics here. 1898 R.suppressDiagnostics(); 1899 1900 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1901 bool NotUnknownSpecialization = false; 1902 DeclContext *DC = computeDeclContext(SS, false); 1903 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1904 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1905 1906 if (!NotUnknownSpecialization) { 1907 // When the scope specifier can refer to a member of an unknown 1908 // specialization, we take it as a type name. 1909 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1910 SS.getWithLocInContext(Context), 1911 *MemberOrBase, IdLoc); 1912 if (BaseType.isNull()) 1913 return true; 1914 1915 R.clear(); 1916 R.setLookupName(MemberOrBase); 1917 } 1918 } 1919 1920 // If no results were found, try to correct typos. 1921 TypoCorrection Corr; 1922 MemInitializerValidatorCCC Validator(ClassDecl); 1923 if (R.empty() && BaseType.isNull() && 1924 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1925 Validator, ClassDecl))) { 1926 std::string CorrectedStr(Corr.getAsString(getLangOpts())); 1927 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOpts())); 1928 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1929 // We have found a non-static data member with a similar 1930 // name to what was typed; complain and initialize that 1931 // member. 1932 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1933 << MemberOrBase << true << CorrectedQuotedStr 1934 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1935 Diag(Member->getLocation(), diag::note_previous_decl) 1936 << CorrectedQuotedStr; 1937 1938 return BuildMemberInitializer(Member, Init, IdLoc); 1939 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1940 const CXXBaseSpecifier *DirectBaseSpec; 1941 const CXXBaseSpecifier *VirtualBaseSpec; 1942 if (FindBaseInitializer(*this, ClassDecl, 1943 Context.getTypeDeclType(Type), 1944 DirectBaseSpec, VirtualBaseSpec)) { 1945 // We have found a direct or virtual base class with a 1946 // similar name to what was typed; complain and initialize 1947 // that base class. 1948 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1949 << MemberOrBase << false << CorrectedQuotedStr 1950 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1951 1952 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1953 : VirtualBaseSpec; 1954 Diag(BaseSpec->getLocStart(), 1955 diag::note_base_class_specified_here) 1956 << BaseSpec->getType() 1957 << BaseSpec->getSourceRange(); 1958 1959 TyD = Type; 1960 } 1961 } 1962 } 1963 1964 if (!TyD && BaseType.isNull()) { 1965 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1966 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 1967 return true; 1968 } 1969 } 1970 1971 if (BaseType.isNull()) { 1972 BaseType = Context.getTypeDeclType(TyD); 1973 if (SS.isSet()) { 1974 NestedNameSpecifier *Qualifier = 1975 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1976 1977 // FIXME: preserve source range information 1978 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1979 } 1980 } 1981 } 1982 1983 if (!TInfo) 1984 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1985 1986 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 1987} 1988 1989/// Checks a member initializer expression for cases where reference (or 1990/// pointer) members are bound to by-value parameters (or their addresses). 1991static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 1992 Expr *Init, 1993 SourceLocation IdLoc) { 1994 QualType MemberTy = Member->getType(); 1995 1996 // We only handle pointers and references currently. 1997 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 1998 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 1999 return; 2000 2001 const bool IsPointer = MemberTy->isPointerType(); 2002 if (IsPointer) { 2003 if (const UnaryOperator *Op 2004 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 2005 // The only case we're worried about with pointers requires taking the 2006 // address. 2007 if (Op->getOpcode() != UO_AddrOf) 2008 return; 2009 2010 Init = Op->getSubExpr(); 2011 } else { 2012 // We only handle address-of expression initializers for pointers. 2013 return; 2014 } 2015 } 2016 2017 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 2018 // Taking the address of a temporary will be diagnosed as a hard error. 2019 if (IsPointer) 2020 return; 2021 2022 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 2023 << Member << Init->getSourceRange(); 2024 } else if (const DeclRefExpr *DRE 2025 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 2026 // We only warn when referring to a non-reference parameter declaration. 2027 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 2028 if (!Parameter || Parameter->getType()->isReferenceType()) 2029 return; 2030 2031 S.Diag(Init->getExprLoc(), 2032 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 2033 : diag::warn_bind_ref_member_to_parameter) 2034 << Member << Parameter << Init->getSourceRange(); 2035 } else { 2036 // Other initializers are fine. 2037 return; 2038 } 2039 2040 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 2041 << (unsigned)IsPointer; 2042} 2043 2044namespace { 2045 class UninitializedFieldVisitor 2046 : public EvaluatedExprVisitor<UninitializedFieldVisitor> { 2047 Sema &S; 2048 ValueDecl *VD; 2049 public: 2050 typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited; 2051 UninitializedFieldVisitor(Sema &S, ValueDecl *VD) : Inherited(S.Context), 2052 S(S), VD(VD) { 2053 } 2054 2055 void HandleExpr(Expr *E) { 2056 if (!E) return; 2057 2058 // Expressions like x(x) sometimes lack the surrounding expressions 2059 // but need to be checked anyways. 2060 HandleValue(E); 2061 Visit(E); 2062 } 2063 2064 void HandleValue(Expr *E) { 2065 E = E->IgnoreParens(); 2066 2067 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 2068 if (isa<EnumConstantDecl>(ME->getMemberDecl())) 2069 return; 2070 Expr *Base = E; 2071 while (isa<MemberExpr>(Base)) { 2072 ME = dyn_cast<MemberExpr>(Base); 2073 if (VarDecl *VarD = dyn_cast<VarDecl>(ME->getMemberDecl())) 2074 if (VarD->hasGlobalStorage()) 2075 return; 2076 Base = ME->getBase(); 2077 } 2078 2079 if (VD == ME->getMemberDecl() && isa<CXXThisExpr>(Base)) { 2080 S.Diag(ME->getExprLoc(), diag::warn_field_is_uninit); 2081 return; 2082 } 2083 } 2084 2085 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 2086 HandleValue(CO->getTrueExpr()); 2087 HandleValue(CO->getFalseExpr()); 2088 return; 2089 } 2090 2091 if (BinaryConditionalOperator *BCO = 2092 dyn_cast<BinaryConditionalOperator>(E)) { 2093 HandleValue(BCO->getCommon()); 2094 HandleValue(BCO->getFalseExpr()); 2095 return; 2096 } 2097 2098 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 2099 switch (BO->getOpcode()) { 2100 default: 2101 return; 2102 case(BO_PtrMemD): 2103 case(BO_PtrMemI): 2104 HandleValue(BO->getLHS()); 2105 return; 2106 case(BO_Comma): 2107 HandleValue(BO->getRHS()); 2108 return; 2109 } 2110 } 2111 } 2112 2113 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 2114 if (E->getCastKind() == CK_LValueToRValue) 2115 HandleValue(E->getSubExpr()); 2116 2117 Inherited::VisitImplicitCastExpr(E); 2118 } 2119 2120 void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) { 2121 Expr *Callee = E->getCallee(); 2122 if (isa<MemberExpr>(Callee)) 2123 HandleValue(Callee); 2124 2125 Inherited::VisitCXXMemberCallExpr(E); 2126 } 2127 }; 2128 static void CheckInitExprContainsUninitializedFields(Sema &S, Expr *E, 2129 ValueDecl *VD) { 2130 UninitializedFieldVisitor(S, VD).HandleExpr(E); 2131 } 2132} // namespace 2133 2134MemInitResult 2135Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2136 SourceLocation IdLoc) { 2137 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2138 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2139 assert((DirectMember || IndirectMember) && 2140 "Member must be a FieldDecl or IndirectFieldDecl"); 2141 2142 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2143 return true; 2144 2145 if (Member->isInvalidDecl()) 2146 return true; 2147 2148 // Diagnose value-uses of fields to initialize themselves, e.g. 2149 // foo(foo) 2150 // where foo is not also a parameter to the constructor. 2151 // TODO: implement -Wuninitialized and fold this into that framework. 2152 Expr **Args; 2153 unsigned NumArgs; 2154 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2155 Args = ParenList->getExprs(); 2156 NumArgs = ParenList->getNumExprs(); 2157 } else { 2158 InitListExpr *InitList = cast<InitListExpr>(Init); 2159 Args = InitList->getInits(); 2160 NumArgs = InitList->getNumInits(); 2161 } 2162 2163 // Mark FieldDecl as being used if it is a non-primitive type and the 2164 // initializer does not call the default constructor (which is trivial 2165 // for all entries in UnusedPrivateFields). 2166 // FIXME: Make this smarter once more side effect-free types can be 2167 // determined. 2168 if (NumArgs > 0) { 2169 if (Member->getType()->isRecordType()) { 2170 UnusedPrivateFields.remove(Member); 2171 } else { 2172 for (unsigned i = 0; i < NumArgs; ++i) { 2173 if (Args[i]->HasSideEffects(Context)) { 2174 UnusedPrivateFields.remove(Member); 2175 break; 2176 } 2177 } 2178 } 2179 } 2180 2181 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, IdLoc) 2182 != DiagnosticsEngine::Ignored) 2183 for (unsigned i = 0; i < NumArgs; ++i) 2184 // FIXME: Warn about the case when other fields are used before being 2185 // uninitialized. For example, let this field be the i'th field. When 2186 // initializing the i'th field, throw a warning if any of the >= i'th 2187 // fields are used, as they are not yet initialized. 2188 // Right now we are only handling the case where the i'th field uses 2189 // itself in its initializer. 2190 CheckInitExprContainsUninitializedFields(*this, Args[i], Member); 2191 2192 SourceRange InitRange = Init->getSourceRange(); 2193 2194 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2195 // Can't check initialization for a member of dependent type or when 2196 // any of the arguments are type-dependent expressions. 2197 DiscardCleanupsInEvaluationContext(); 2198 } else { 2199 bool InitList = false; 2200 if (isa<InitListExpr>(Init)) { 2201 InitList = true; 2202 Args = &Init; 2203 NumArgs = 1; 2204 2205 if (isStdInitializerList(Member->getType(), 0)) { 2206 Diag(IdLoc, diag::warn_dangling_std_initializer_list) 2207 << /*at end of ctor*/1 << InitRange; 2208 } 2209 } 2210 2211 // Initialize the member. 2212 InitializedEntity MemberEntity = 2213 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2214 : InitializedEntity::InitializeMember(IndirectMember, 0); 2215 InitializationKind Kind = 2216 InitList ? InitializationKind::CreateDirectList(IdLoc) 2217 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2218 InitRange.getEnd()); 2219 2220 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 2221 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, 2222 MultiExprArg(*this, Args, NumArgs), 2223 0); 2224 if (MemberInit.isInvalid()) 2225 return true; 2226 2227 CheckImplicitConversions(MemberInit.get(), 2228 InitRange.getBegin()); 2229 2230 // C++0x [class.base.init]p7: 2231 // The initialization of each base and member constitutes a 2232 // full-expression. 2233 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2234 if (MemberInit.isInvalid()) 2235 return true; 2236 2237 // If we are in a dependent context, template instantiation will 2238 // perform this type-checking again. Just save the arguments that we 2239 // received. 2240 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2241 // of the information that we have about the member 2242 // initializer. However, deconstructing the ASTs is a dicey process, 2243 // and this approach is far more likely to get the corner cases right. 2244 if (CurContext->isDependentContext()) { 2245 // The existing Init will do fine. 2246 } else { 2247 Init = MemberInit.get(); 2248 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2249 } 2250 } 2251 2252 if (DirectMember) { 2253 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2254 InitRange.getBegin(), Init, 2255 InitRange.getEnd()); 2256 } else { 2257 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2258 InitRange.getBegin(), Init, 2259 InitRange.getEnd()); 2260 } 2261} 2262 2263MemInitResult 2264Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2265 CXXRecordDecl *ClassDecl) { 2266 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2267 if (!LangOpts.CPlusPlus0x) 2268 return Diag(NameLoc, diag::err_delegating_ctor) 2269 << TInfo->getTypeLoc().getLocalSourceRange(); 2270 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2271 2272 bool InitList = true; 2273 Expr **Args = &Init; 2274 unsigned NumArgs = 1; 2275 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2276 InitList = false; 2277 Args = ParenList->getExprs(); 2278 NumArgs = ParenList->getNumExprs(); 2279 } 2280 2281 SourceRange InitRange = Init->getSourceRange(); 2282 // Initialize the object. 2283 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2284 QualType(ClassDecl->getTypeForDecl(), 0)); 2285 InitializationKind Kind = 2286 InitList ? InitializationKind::CreateDirectList(NameLoc) 2287 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2288 InitRange.getEnd()); 2289 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 2290 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2291 MultiExprArg(*this, Args,NumArgs), 2292 0); 2293 if (DelegationInit.isInvalid()) 2294 return true; 2295 2296 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2297 "Delegating constructor with no target?"); 2298 2299 CheckImplicitConversions(DelegationInit.get(), InitRange.getBegin()); 2300 2301 // C++0x [class.base.init]p7: 2302 // The initialization of each base and member constitutes a 2303 // full-expression. 2304 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2305 if (DelegationInit.isInvalid()) 2306 return true; 2307 2308 // If we are in a dependent context, template instantiation will 2309 // perform this type-checking again. Just save the arguments that we 2310 // received in a ParenListExpr. 2311 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2312 // of the information that we have about the base 2313 // initializer. However, deconstructing the ASTs is a dicey process, 2314 // and this approach is far more likely to get the corner cases right. 2315 if (CurContext->isDependentContext()) 2316 DelegationInit = Owned(Init); 2317 2318 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2319 DelegationInit.takeAs<Expr>(), 2320 InitRange.getEnd()); 2321} 2322 2323MemInitResult 2324Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2325 Expr *Init, CXXRecordDecl *ClassDecl, 2326 SourceLocation EllipsisLoc) { 2327 SourceLocation BaseLoc 2328 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2329 2330 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2331 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2332 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2333 2334 // C++ [class.base.init]p2: 2335 // [...] Unless the mem-initializer-id names a nonstatic data 2336 // member of the constructor's class or a direct or virtual base 2337 // of that class, the mem-initializer is ill-formed. A 2338 // mem-initializer-list can initialize a base class using any 2339 // name that denotes that base class type. 2340 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2341 2342 SourceRange InitRange = Init->getSourceRange(); 2343 if (EllipsisLoc.isValid()) { 2344 // This is a pack expansion. 2345 if (!BaseType->containsUnexpandedParameterPack()) { 2346 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2347 << SourceRange(BaseLoc, InitRange.getEnd()); 2348 2349 EllipsisLoc = SourceLocation(); 2350 } 2351 } else { 2352 // Check for any unexpanded parameter packs. 2353 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2354 return true; 2355 2356 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2357 return true; 2358 } 2359 2360 // Check for direct and virtual base classes. 2361 const CXXBaseSpecifier *DirectBaseSpec = 0; 2362 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2363 if (!Dependent) { 2364 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2365 BaseType)) 2366 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2367 2368 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2369 VirtualBaseSpec); 2370 2371 // C++ [base.class.init]p2: 2372 // Unless the mem-initializer-id names a nonstatic data member of the 2373 // constructor's class or a direct or virtual base of that class, the 2374 // mem-initializer is ill-formed. 2375 if (!DirectBaseSpec && !VirtualBaseSpec) { 2376 // If the class has any dependent bases, then it's possible that 2377 // one of those types will resolve to the same type as 2378 // BaseType. Therefore, just treat this as a dependent base 2379 // class initialization. FIXME: Should we try to check the 2380 // initialization anyway? It seems odd. 2381 if (ClassDecl->hasAnyDependentBases()) 2382 Dependent = true; 2383 else 2384 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2385 << BaseType << Context.getTypeDeclType(ClassDecl) 2386 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2387 } 2388 } 2389 2390 if (Dependent) { 2391 DiscardCleanupsInEvaluationContext(); 2392 2393 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2394 /*IsVirtual=*/false, 2395 InitRange.getBegin(), Init, 2396 InitRange.getEnd(), EllipsisLoc); 2397 } 2398 2399 // C++ [base.class.init]p2: 2400 // If a mem-initializer-id is ambiguous because it designates both 2401 // a direct non-virtual base class and an inherited virtual base 2402 // class, the mem-initializer is ill-formed. 2403 if (DirectBaseSpec && VirtualBaseSpec) 2404 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2405 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2406 2407 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2408 if (!BaseSpec) 2409 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2410 2411 // Initialize the base. 2412 bool InitList = true; 2413 Expr **Args = &Init; 2414 unsigned NumArgs = 1; 2415 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2416 InitList = false; 2417 Args = ParenList->getExprs(); 2418 NumArgs = ParenList->getNumExprs(); 2419 } 2420 2421 InitializedEntity BaseEntity = 2422 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2423 InitializationKind Kind = 2424 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2425 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2426 InitRange.getEnd()); 2427 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 2428 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, 2429 MultiExprArg(*this, Args, NumArgs), 2430 0); 2431 if (BaseInit.isInvalid()) 2432 return true; 2433 2434 CheckImplicitConversions(BaseInit.get(), InitRange.getBegin()); 2435 2436 // C++0x [class.base.init]p7: 2437 // The initialization of each base and member constitutes a 2438 // full-expression. 2439 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2440 if (BaseInit.isInvalid()) 2441 return true; 2442 2443 // If we are in a dependent context, template instantiation will 2444 // perform this type-checking again. Just save the arguments that we 2445 // received in a ParenListExpr. 2446 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2447 // of the information that we have about the base 2448 // initializer. However, deconstructing the ASTs is a dicey process, 2449 // and this approach is far more likely to get the corner cases right. 2450 if (CurContext->isDependentContext()) 2451 BaseInit = Owned(Init); 2452 2453 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2454 BaseSpec->isVirtual(), 2455 InitRange.getBegin(), 2456 BaseInit.takeAs<Expr>(), 2457 InitRange.getEnd(), EllipsisLoc); 2458} 2459 2460// Create a static_cast\<T&&>(expr). 2461static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2462 QualType ExprType = E->getType(); 2463 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2464 SourceLocation ExprLoc = E->getLocStart(); 2465 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2466 TargetType, ExprLoc); 2467 2468 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2469 SourceRange(ExprLoc, ExprLoc), 2470 E->getSourceRange()).take(); 2471} 2472 2473/// ImplicitInitializerKind - How an implicit base or member initializer should 2474/// initialize its base or member. 2475enum ImplicitInitializerKind { 2476 IIK_Default, 2477 IIK_Copy, 2478 IIK_Move 2479}; 2480 2481static bool 2482BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2483 ImplicitInitializerKind ImplicitInitKind, 2484 CXXBaseSpecifier *BaseSpec, 2485 bool IsInheritedVirtualBase, 2486 CXXCtorInitializer *&CXXBaseInit) { 2487 InitializedEntity InitEntity 2488 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2489 IsInheritedVirtualBase); 2490 2491 ExprResult BaseInit; 2492 2493 switch (ImplicitInitKind) { 2494 case IIK_Default: { 2495 InitializationKind InitKind 2496 = InitializationKind::CreateDefault(Constructor->getLocation()); 2497 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2498 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2499 MultiExprArg(SemaRef, 0, 0)); 2500 break; 2501 } 2502 2503 case IIK_Move: 2504 case IIK_Copy: { 2505 bool Moving = ImplicitInitKind == IIK_Move; 2506 ParmVarDecl *Param = Constructor->getParamDecl(0); 2507 QualType ParamType = Param->getType().getNonReferenceType(); 2508 2509 Expr *CopyCtorArg = 2510 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2511 SourceLocation(), Param, false, 2512 Constructor->getLocation(), ParamType, 2513 VK_LValue, 0); 2514 2515 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2516 2517 // Cast to the base class to avoid ambiguities. 2518 QualType ArgTy = 2519 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2520 ParamType.getQualifiers()); 2521 2522 if (Moving) { 2523 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2524 } 2525 2526 CXXCastPath BasePath; 2527 BasePath.push_back(BaseSpec); 2528 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2529 CK_UncheckedDerivedToBase, 2530 Moving ? VK_XValue : VK_LValue, 2531 &BasePath).take(); 2532 2533 InitializationKind InitKind 2534 = InitializationKind::CreateDirect(Constructor->getLocation(), 2535 SourceLocation(), SourceLocation()); 2536 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2537 &CopyCtorArg, 1); 2538 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2539 MultiExprArg(&CopyCtorArg, 1)); 2540 break; 2541 } 2542 } 2543 2544 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2545 if (BaseInit.isInvalid()) 2546 return true; 2547 2548 CXXBaseInit = 2549 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2550 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2551 SourceLocation()), 2552 BaseSpec->isVirtual(), 2553 SourceLocation(), 2554 BaseInit.takeAs<Expr>(), 2555 SourceLocation(), 2556 SourceLocation()); 2557 2558 return false; 2559} 2560 2561static bool RefersToRValueRef(Expr *MemRef) { 2562 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2563 return Referenced->getType()->isRValueReferenceType(); 2564} 2565 2566static bool 2567BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2568 ImplicitInitializerKind ImplicitInitKind, 2569 FieldDecl *Field, IndirectFieldDecl *Indirect, 2570 CXXCtorInitializer *&CXXMemberInit) { 2571 if (Field->isInvalidDecl()) 2572 return true; 2573 2574 SourceLocation Loc = Constructor->getLocation(); 2575 2576 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2577 bool Moving = ImplicitInitKind == IIK_Move; 2578 ParmVarDecl *Param = Constructor->getParamDecl(0); 2579 QualType ParamType = Param->getType().getNonReferenceType(); 2580 2581 // Suppress copying zero-width bitfields. 2582 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2583 return false; 2584 2585 Expr *MemberExprBase = 2586 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2587 SourceLocation(), Param, false, 2588 Loc, ParamType, VK_LValue, 0); 2589 2590 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2591 2592 if (Moving) { 2593 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2594 } 2595 2596 // Build a reference to this field within the parameter. 2597 CXXScopeSpec SS; 2598 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2599 Sema::LookupMemberName); 2600 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2601 : cast<ValueDecl>(Field), AS_public); 2602 MemberLookup.resolveKind(); 2603 ExprResult CtorArg 2604 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2605 ParamType, Loc, 2606 /*IsArrow=*/false, 2607 SS, 2608 /*TemplateKWLoc=*/SourceLocation(), 2609 /*FirstQualifierInScope=*/0, 2610 MemberLookup, 2611 /*TemplateArgs=*/0); 2612 if (CtorArg.isInvalid()) 2613 return true; 2614 2615 // C++11 [class.copy]p15: 2616 // - if a member m has rvalue reference type T&&, it is direct-initialized 2617 // with static_cast<T&&>(x.m); 2618 if (RefersToRValueRef(CtorArg.get())) { 2619 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2620 } 2621 2622 // When the field we are copying is an array, create index variables for 2623 // each dimension of the array. We use these index variables to subscript 2624 // the source array, and other clients (e.g., CodeGen) will perform the 2625 // necessary iteration with these index variables. 2626 SmallVector<VarDecl *, 4> IndexVariables; 2627 QualType BaseType = Field->getType(); 2628 QualType SizeType = SemaRef.Context.getSizeType(); 2629 bool InitializingArray = false; 2630 while (const ConstantArrayType *Array 2631 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2632 InitializingArray = true; 2633 // Create the iteration variable for this array index. 2634 IdentifierInfo *IterationVarName = 0; 2635 { 2636 SmallString<8> Str; 2637 llvm::raw_svector_ostream OS(Str); 2638 OS << "__i" << IndexVariables.size(); 2639 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2640 } 2641 VarDecl *IterationVar 2642 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2643 IterationVarName, SizeType, 2644 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2645 SC_None, SC_None); 2646 IndexVariables.push_back(IterationVar); 2647 2648 // Create a reference to the iteration variable. 2649 ExprResult IterationVarRef 2650 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2651 assert(!IterationVarRef.isInvalid() && 2652 "Reference to invented variable cannot fail!"); 2653 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2654 assert(!IterationVarRef.isInvalid() && 2655 "Conversion of invented variable cannot fail!"); 2656 2657 // Subscript the array with this iteration variable. 2658 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2659 IterationVarRef.take(), 2660 Loc); 2661 if (CtorArg.isInvalid()) 2662 return true; 2663 2664 BaseType = Array->getElementType(); 2665 } 2666 2667 // The array subscript expression is an lvalue, which is wrong for moving. 2668 if (Moving && InitializingArray) 2669 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2670 2671 // Construct the entity that we will be initializing. For an array, this 2672 // will be first element in the array, which may require several levels 2673 // of array-subscript entities. 2674 SmallVector<InitializedEntity, 4> Entities; 2675 Entities.reserve(1 + IndexVariables.size()); 2676 if (Indirect) 2677 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2678 else 2679 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2680 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2681 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2682 0, 2683 Entities.back())); 2684 2685 // Direct-initialize to use the copy constructor. 2686 InitializationKind InitKind = 2687 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2688 2689 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2690 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2691 &CtorArgE, 1); 2692 2693 ExprResult MemberInit 2694 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2695 MultiExprArg(&CtorArgE, 1)); 2696 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2697 if (MemberInit.isInvalid()) 2698 return true; 2699 2700 if (Indirect) { 2701 assert(IndexVariables.size() == 0 && 2702 "Indirect field improperly initialized"); 2703 CXXMemberInit 2704 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2705 Loc, Loc, 2706 MemberInit.takeAs<Expr>(), 2707 Loc); 2708 } else 2709 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2710 Loc, MemberInit.takeAs<Expr>(), 2711 Loc, 2712 IndexVariables.data(), 2713 IndexVariables.size()); 2714 return false; 2715 } 2716 2717 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2718 2719 QualType FieldBaseElementType = 2720 SemaRef.Context.getBaseElementType(Field->getType()); 2721 2722 if (FieldBaseElementType->isRecordType()) { 2723 InitializedEntity InitEntity 2724 = Indirect? InitializedEntity::InitializeMember(Indirect) 2725 : InitializedEntity::InitializeMember(Field); 2726 InitializationKind InitKind = 2727 InitializationKind::CreateDefault(Loc); 2728 2729 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2730 ExprResult MemberInit = 2731 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2732 2733 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2734 if (MemberInit.isInvalid()) 2735 return true; 2736 2737 if (Indirect) 2738 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2739 Indirect, Loc, 2740 Loc, 2741 MemberInit.get(), 2742 Loc); 2743 else 2744 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2745 Field, Loc, Loc, 2746 MemberInit.get(), 2747 Loc); 2748 return false; 2749 } 2750 2751 if (!Field->getParent()->isUnion()) { 2752 if (FieldBaseElementType->isReferenceType()) { 2753 SemaRef.Diag(Constructor->getLocation(), 2754 diag::err_uninitialized_member_in_ctor) 2755 << (int)Constructor->isImplicit() 2756 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2757 << 0 << Field->getDeclName(); 2758 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2759 return true; 2760 } 2761 2762 if (FieldBaseElementType.isConstQualified()) { 2763 SemaRef.Diag(Constructor->getLocation(), 2764 diag::err_uninitialized_member_in_ctor) 2765 << (int)Constructor->isImplicit() 2766 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2767 << 1 << Field->getDeclName(); 2768 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2769 return true; 2770 } 2771 } 2772 2773 if (SemaRef.getLangOpts().ObjCAutoRefCount && 2774 FieldBaseElementType->isObjCRetainableType() && 2775 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2776 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2777 // ARC: 2778 // Default-initialize Objective-C pointers to NULL. 2779 CXXMemberInit 2780 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2781 Loc, Loc, 2782 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2783 Loc); 2784 return false; 2785 } 2786 2787 // Nothing to initialize. 2788 CXXMemberInit = 0; 2789 return false; 2790} 2791 2792namespace { 2793struct BaseAndFieldInfo { 2794 Sema &S; 2795 CXXConstructorDecl *Ctor; 2796 bool AnyErrorsInInits; 2797 ImplicitInitializerKind IIK; 2798 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2799 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2800 2801 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2802 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2803 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2804 if (Generated && Ctor->isCopyConstructor()) 2805 IIK = IIK_Copy; 2806 else if (Generated && Ctor->isMoveConstructor()) 2807 IIK = IIK_Move; 2808 else 2809 IIK = IIK_Default; 2810 } 2811 2812 bool isImplicitCopyOrMove() const { 2813 switch (IIK) { 2814 case IIK_Copy: 2815 case IIK_Move: 2816 return true; 2817 2818 case IIK_Default: 2819 return false; 2820 } 2821 2822 llvm_unreachable("Invalid ImplicitInitializerKind!"); 2823 } 2824}; 2825} 2826 2827/// \brief Determine whether the given indirect field declaration is somewhere 2828/// within an anonymous union. 2829static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2830 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2831 CEnd = F->chain_end(); 2832 C != CEnd; ++C) 2833 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2834 if (Record->isUnion()) 2835 return true; 2836 2837 return false; 2838} 2839 2840/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2841/// array type. 2842static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2843 if (T->isIncompleteArrayType()) 2844 return true; 2845 2846 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2847 if (!ArrayT->getSize()) 2848 return true; 2849 2850 T = ArrayT->getElementType(); 2851 } 2852 2853 return false; 2854} 2855 2856static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2857 FieldDecl *Field, 2858 IndirectFieldDecl *Indirect = 0) { 2859 2860 // Overwhelmingly common case: we have a direct initializer for this field. 2861 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2862 Info.AllToInit.push_back(Init); 2863 return false; 2864 } 2865 2866 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2867 // has a brace-or-equal-initializer, the entity is initialized as specified 2868 // in [dcl.init]. 2869 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 2870 CXXCtorInitializer *Init; 2871 if (Indirect) 2872 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2873 SourceLocation(), 2874 SourceLocation(), 0, 2875 SourceLocation()); 2876 else 2877 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2878 SourceLocation(), 2879 SourceLocation(), 0, 2880 SourceLocation()); 2881 Info.AllToInit.push_back(Init); 2882 2883 // Check whether this initializer makes the field "used". 2884 Expr *InitExpr = Field->getInClassInitializer(); 2885 if (Field->getType()->isRecordType() || 2886 (InitExpr && InitExpr->HasSideEffects(SemaRef.Context))) 2887 SemaRef.UnusedPrivateFields.remove(Field); 2888 2889 return false; 2890 } 2891 2892 // Don't build an implicit initializer for union members if none was 2893 // explicitly specified. 2894 if (Field->getParent()->isUnion() || 2895 (Indirect && isWithinAnonymousUnion(Indirect))) 2896 return false; 2897 2898 // Don't initialize incomplete or zero-length arrays. 2899 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 2900 return false; 2901 2902 // Don't try to build an implicit initializer if there were semantic 2903 // errors in any of the initializers (and therefore we might be 2904 // missing some that the user actually wrote). 2905 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2906 return false; 2907 2908 CXXCtorInitializer *Init = 0; 2909 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2910 Indirect, Init)) 2911 return true; 2912 2913 if (Init) 2914 Info.AllToInit.push_back(Init); 2915 2916 return false; 2917} 2918 2919bool 2920Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2921 CXXCtorInitializer *Initializer) { 2922 assert(Initializer->isDelegatingInitializer()); 2923 Constructor->setNumCtorInitializers(1); 2924 CXXCtorInitializer **initializer = 2925 new (Context) CXXCtorInitializer*[1]; 2926 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2927 Constructor->setCtorInitializers(initializer); 2928 2929 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2930 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 2931 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2932 } 2933 2934 DelegatingCtorDecls.push_back(Constructor); 2935 2936 return false; 2937} 2938 2939bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2940 CXXCtorInitializer **Initializers, 2941 unsigned NumInitializers, 2942 bool AnyErrors) { 2943 if (Constructor->isDependentContext()) { 2944 // Just store the initializers as written, they will be checked during 2945 // instantiation. 2946 if (NumInitializers > 0) { 2947 Constructor->setNumCtorInitializers(NumInitializers); 2948 CXXCtorInitializer **baseOrMemberInitializers = 2949 new (Context) CXXCtorInitializer*[NumInitializers]; 2950 memcpy(baseOrMemberInitializers, Initializers, 2951 NumInitializers * sizeof(CXXCtorInitializer*)); 2952 Constructor->setCtorInitializers(baseOrMemberInitializers); 2953 } 2954 2955 return false; 2956 } 2957 2958 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2959 2960 // We need to build the initializer AST according to order of construction 2961 // and not what user specified in the Initializers list. 2962 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2963 if (!ClassDecl) 2964 return true; 2965 2966 bool HadError = false; 2967 2968 for (unsigned i = 0; i < NumInitializers; i++) { 2969 CXXCtorInitializer *Member = Initializers[i]; 2970 2971 if (Member->isBaseInitializer()) 2972 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2973 else 2974 Info.AllBaseFields[Member->getAnyMember()] = Member; 2975 } 2976 2977 // Keep track of the direct virtual bases. 2978 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2979 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2980 E = ClassDecl->bases_end(); I != E; ++I) { 2981 if (I->isVirtual()) 2982 DirectVBases.insert(I); 2983 } 2984 2985 // Push virtual bases before others. 2986 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2987 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2988 2989 if (CXXCtorInitializer *Value 2990 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2991 Info.AllToInit.push_back(Value); 2992 } else if (!AnyErrors) { 2993 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2994 CXXCtorInitializer *CXXBaseInit; 2995 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2996 VBase, IsInheritedVirtualBase, 2997 CXXBaseInit)) { 2998 HadError = true; 2999 continue; 3000 } 3001 3002 Info.AllToInit.push_back(CXXBaseInit); 3003 } 3004 } 3005 3006 // Non-virtual bases. 3007 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3008 E = ClassDecl->bases_end(); Base != E; ++Base) { 3009 // Virtuals are in the virtual base list and already constructed. 3010 if (Base->isVirtual()) 3011 continue; 3012 3013 if (CXXCtorInitializer *Value 3014 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 3015 Info.AllToInit.push_back(Value); 3016 } else if (!AnyErrors) { 3017 CXXCtorInitializer *CXXBaseInit; 3018 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3019 Base, /*IsInheritedVirtualBase=*/false, 3020 CXXBaseInit)) { 3021 HadError = true; 3022 continue; 3023 } 3024 3025 Info.AllToInit.push_back(CXXBaseInit); 3026 } 3027 } 3028 3029 // Fields. 3030 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 3031 MemEnd = ClassDecl->decls_end(); 3032 Mem != MemEnd; ++Mem) { 3033 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 3034 // C++ [class.bit]p2: 3035 // A declaration for a bit-field that omits the identifier declares an 3036 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 3037 // initialized. 3038 if (F->isUnnamedBitfield()) 3039 continue; 3040 3041 // If we're not generating the implicit copy/move constructor, then we'll 3042 // handle anonymous struct/union fields based on their individual 3043 // indirect fields. 3044 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 3045 continue; 3046 3047 if (CollectFieldInitializer(*this, Info, F)) 3048 HadError = true; 3049 continue; 3050 } 3051 3052 // Beyond this point, we only consider default initialization. 3053 if (Info.IIK != IIK_Default) 3054 continue; 3055 3056 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 3057 if (F->getType()->isIncompleteArrayType()) { 3058 assert(ClassDecl->hasFlexibleArrayMember() && 3059 "Incomplete array type is not valid"); 3060 continue; 3061 } 3062 3063 // Initialize each field of an anonymous struct individually. 3064 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 3065 HadError = true; 3066 3067 continue; 3068 } 3069 } 3070 3071 NumInitializers = Info.AllToInit.size(); 3072 if (NumInitializers > 0) { 3073 Constructor->setNumCtorInitializers(NumInitializers); 3074 CXXCtorInitializer **baseOrMemberInitializers = 3075 new (Context) CXXCtorInitializer*[NumInitializers]; 3076 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 3077 NumInitializers * sizeof(CXXCtorInitializer*)); 3078 Constructor->setCtorInitializers(baseOrMemberInitializers); 3079 3080 // Constructors implicitly reference the base and member 3081 // destructors. 3082 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 3083 Constructor->getParent()); 3084 } 3085 3086 return HadError; 3087} 3088 3089static void *GetKeyForTopLevelField(FieldDecl *Field) { 3090 // For anonymous unions, use the class declaration as the key. 3091 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 3092 if (RT->getDecl()->isAnonymousStructOrUnion()) 3093 return static_cast<void *>(RT->getDecl()); 3094 } 3095 return static_cast<void *>(Field); 3096} 3097 3098static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 3099 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 3100} 3101 3102static void *GetKeyForMember(ASTContext &Context, 3103 CXXCtorInitializer *Member) { 3104 if (!Member->isAnyMemberInitializer()) 3105 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3106 3107 // For fields injected into the class via declaration of an anonymous union, 3108 // use its anonymous union class declaration as the unique key. 3109 FieldDecl *Field = Member->getAnyMember(); 3110 3111 // If the field is a member of an anonymous struct or union, our key 3112 // is the anonymous record decl that's a direct child of the class. 3113 RecordDecl *RD = Field->getParent(); 3114 if (RD->isAnonymousStructOrUnion()) { 3115 while (true) { 3116 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 3117 if (Parent->isAnonymousStructOrUnion()) 3118 RD = Parent; 3119 else 3120 break; 3121 } 3122 3123 return static_cast<void *>(RD); 3124 } 3125 3126 return static_cast<void *>(Field); 3127} 3128 3129static void 3130DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 3131 const CXXConstructorDecl *Constructor, 3132 CXXCtorInitializer **Inits, 3133 unsigned NumInits) { 3134 if (Constructor->getDeclContext()->isDependentContext()) 3135 return; 3136 3137 // Don't check initializers order unless the warning is enabled at the 3138 // location of at least one initializer. 3139 bool ShouldCheckOrder = false; 3140 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3141 CXXCtorInitializer *Init = Inits[InitIndex]; 3142 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3143 Init->getSourceLocation()) 3144 != DiagnosticsEngine::Ignored) { 3145 ShouldCheckOrder = true; 3146 break; 3147 } 3148 } 3149 if (!ShouldCheckOrder) 3150 return; 3151 3152 // Build the list of bases and members in the order that they'll 3153 // actually be initialized. The explicit initializers should be in 3154 // this same order but may be missing things. 3155 SmallVector<const void*, 32> IdealInitKeys; 3156 3157 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3158 3159 // 1. Virtual bases. 3160 for (CXXRecordDecl::base_class_const_iterator VBase = 3161 ClassDecl->vbases_begin(), 3162 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3163 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3164 3165 // 2. Non-virtual bases. 3166 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3167 E = ClassDecl->bases_end(); Base != E; ++Base) { 3168 if (Base->isVirtual()) 3169 continue; 3170 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3171 } 3172 3173 // 3. Direct fields. 3174 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3175 E = ClassDecl->field_end(); Field != E; ++Field) { 3176 if (Field->isUnnamedBitfield()) 3177 continue; 3178 3179 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 3180 } 3181 3182 unsigned NumIdealInits = IdealInitKeys.size(); 3183 unsigned IdealIndex = 0; 3184 3185 CXXCtorInitializer *PrevInit = 0; 3186 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3187 CXXCtorInitializer *Init = Inits[InitIndex]; 3188 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3189 3190 // Scan forward to try to find this initializer in the idealized 3191 // initializers list. 3192 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3193 if (InitKey == IdealInitKeys[IdealIndex]) 3194 break; 3195 3196 // If we didn't find this initializer, it must be because we 3197 // scanned past it on a previous iteration. That can only 3198 // happen if we're out of order; emit a warning. 3199 if (IdealIndex == NumIdealInits && PrevInit) { 3200 Sema::SemaDiagnosticBuilder D = 3201 SemaRef.Diag(PrevInit->getSourceLocation(), 3202 diag::warn_initializer_out_of_order); 3203 3204 if (PrevInit->isAnyMemberInitializer()) 3205 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3206 else 3207 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3208 3209 if (Init->isAnyMemberInitializer()) 3210 D << 0 << Init->getAnyMember()->getDeclName(); 3211 else 3212 D << 1 << Init->getTypeSourceInfo()->getType(); 3213 3214 // Move back to the initializer's location in the ideal list. 3215 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3216 if (InitKey == IdealInitKeys[IdealIndex]) 3217 break; 3218 3219 assert(IdealIndex != NumIdealInits && 3220 "initializer not found in initializer list"); 3221 } 3222 3223 PrevInit = Init; 3224 } 3225} 3226 3227namespace { 3228bool CheckRedundantInit(Sema &S, 3229 CXXCtorInitializer *Init, 3230 CXXCtorInitializer *&PrevInit) { 3231 if (!PrevInit) { 3232 PrevInit = Init; 3233 return false; 3234 } 3235 3236 if (FieldDecl *Field = Init->getMember()) 3237 S.Diag(Init->getSourceLocation(), 3238 diag::err_multiple_mem_initialization) 3239 << Field->getDeclName() 3240 << Init->getSourceRange(); 3241 else { 3242 const Type *BaseClass = Init->getBaseClass(); 3243 assert(BaseClass && "neither field nor base"); 3244 S.Diag(Init->getSourceLocation(), 3245 diag::err_multiple_base_initialization) 3246 << QualType(BaseClass, 0) 3247 << Init->getSourceRange(); 3248 } 3249 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3250 << 0 << PrevInit->getSourceRange(); 3251 3252 return true; 3253} 3254 3255typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3256typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3257 3258bool CheckRedundantUnionInit(Sema &S, 3259 CXXCtorInitializer *Init, 3260 RedundantUnionMap &Unions) { 3261 FieldDecl *Field = Init->getAnyMember(); 3262 RecordDecl *Parent = Field->getParent(); 3263 NamedDecl *Child = Field; 3264 3265 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3266 if (Parent->isUnion()) { 3267 UnionEntry &En = Unions[Parent]; 3268 if (En.first && En.first != Child) { 3269 S.Diag(Init->getSourceLocation(), 3270 diag::err_multiple_mem_union_initialization) 3271 << Field->getDeclName() 3272 << Init->getSourceRange(); 3273 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3274 << 0 << En.second->getSourceRange(); 3275 return true; 3276 } 3277 if (!En.first) { 3278 En.first = Child; 3279 En.second = Init; 3280 } 3281 if (!Parent->isAnonymousStructOrUnion()) 3282 return false; 3283 } 3284 3285 Child = Parent; 3286 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3287 } 3288 3289 return false; 3290} 3291} 3292 3293/// ActOnMemInitializers - Handle the member initializers for a constructor. 3294void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3295 SourceLocation ColonLoc, 3296 CXXCtorInitializer **meminits, 3297 unsigned NumMemInits, 3298 bool AnyErrors) { 3299 if (!ConstructorDecl) 3300 return; 3301 3302 AdjustDeclIfTemplate(ConstructorDecl); 3303 3304 CXXConstructorDecl *Constructor 3305 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3306 3307 if (!Constructor) { 3308 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3309 return; 3310 } 3311 3312 CXXCtorInitializer **MemInits = 3313 reinterpret_cast<CXXCtorInitializer **>(meminits); 3314 3315 // Mapping for the duplicate initializers check. 3316 // For member initializers, this is keyed with a FieldDecl*. 3317 // For base initializers, this is keyed with a Type*. 3318 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3319 3320 // Mapping for the inconsistent anonymous-union initializers check. 3321 RedundantUnionMap MemberUnions; 3322 3323 bool HadError = false; 3324 for (unsigned i = 0; i < NumMemInits; i++) { 3325 CXXCtorInitializer *Init = MemInits[i]; 3326 3327 // Set the source order index. 3328 Init->setSourceOrder(i); 3329 3330 if (Init->isAnyMemberInitializer()) { 3331 FieldDecl *Field = Init->getAnyMember(); 3332 if (CheckRedundantInit(*this, Init, Members[Field]) || 3333 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3334 HadError = true; 3335 } else if (Init->isBaseInitializer()) { 3336 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3337 if (CheckRedundantInit(*this, Init, Members[Key])) 3338 HadError = true; 3339 } else { 3340 assert(Init->isDelegatingInitializer()); 3341 // This must be the only initializer 3342 if (i != 0 || NumMemInits > 1) { 3343 Diag(MemInits[0]->getSourceLocation(), 3344 diag::err_delegating_initializer_alone) 3345 << MemInits[0]->getSourceRange(); 3346 HadError = true; 3347 // We will treat this as being the only initializer. 3348 } 3349 SetDelegatingInitializer(Constructor, MemInits[i]); 3350 // Return immediately as the initializer is set. 3351 return; 3352 } 3353 } 3354 3355 if (HadError) 3356 return; 3357 3358 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3359 3360 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3361} 3362 3363void 3364Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3365 CXXRecordDecl *ClassDecl) { 3366 // Ignore dependent contexts. Also ignore unions, since their members never 3367 // have destructors implicitly called. 3368 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3369 return; 3370 3371 // FIXME: all the access-control diagnostics are positioned on the 3372 // field/base declaration. That's probably good; that said, the 3373 // user might reasonably want to know why the destructor is being 3374 // emitted, and we currently don't say. 3375 3376 // Non-static data members. 3377 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3378 E = ClassDecl->field_end(); I != E; ++I) { 3379 FieldDecl *Field = *I; 3380 if (Field->isInvalidDecl()) 3381 continue; 3382 3383 // Don't destroy incomplete or zero-length arrays. 3384 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3385 continue; 3386 3387 QualType FieldType = Context.getBaseElementType(Field->getType()); 3388 3389 const RecordType* RT = FieldType->getAs<RecordType>(); 3390 if (!RT) 3391 continue; 3392 3393 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3394 if (FieldClassDecl->isInvalidDecl()) 3395 continue; 3396 if (FieldClassDecl->hasIrrelevantDestructor()) 3397 continue; 3398 // The destructor for an implicit anonymous union member is never invoked. 3399 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) 3400 continue; 3401 3402 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3403 assert(Dtor && "No dtor found for FieldClassDecl!"); 3404 CheckDestructorAccess(Field->getLocation(), Dtor, 3405 PDiag(diag::err_access_dtor_field) 3406 << Field->getDeclName() 3407 << FieldType); 3408 3409 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3410 DiagnoseUseOfDecl(Dtor, Location); 3411 } 3412 3413 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3414 3415 // Bases. 3416 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3417 E = ClassDecl->bases_end(); Base != E; ++Base) { 3418 // Bases are always records in a well-formed non-dependent class. 3419 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3420 3421 // Remember direct virtual bases. 3422 if (Base->isVirtual()) 3423 DirectVirtualBases.insert(RT); 3424 3425 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3426 // If our base class is invalid, we probably can't get its dtor anyway. 3427 if (BaseClassDecl->isInvalidDecl()) 3428 continue; 3429 if (BaseClassDecl->hasIrrelevantDestructor()) 3430 continue; 3431 3432 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3433 assert(Dtor && "No dtor found for BaseClassDecl!"); 3434 3435 // FIXME: caret should be on the start of the class name 3436 CheckDestructorAccess(Base->getLocStart(), Dtor, 3437 PDiag(diag::err_access_dtor_base) 3438 << Base->getType() 3439 << Base->getSourceRange(), 3440 Context.getTypeDeclType(ClassDecl)); 3441 3442 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3443 DiagnoseUseOfDecl(Dtor, Location); 3444 } 3445 3446 // Virtual bases. 3447 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3448 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3449 3450 // Bases are always records in a well-formed non-dependent class. 3451 const RecordType *RT = VBase->getType()->castAs<RecordType>(); 3452 3453 // Ignore direct virtual bases. 3454 if (DirectVirtualBases.count(RT)) 3455 continue; 3456 3457 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3458 // If our base class is invalid, we probably can't get its dtor anyway. 3459 if (BaseClassDecl->isInvalidDecl()) 3460 continue; 3461 if (BaseClassDecl->hasIrrelevantDestructor()) 3462 continue; 3463 3464 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3465 assert(Dtor && "No dtor found for BaseClassDecl!"); 3466 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3467 PDiag(diag::err_access_dtor_vbase) 3468 << VBase->getType(), 3469 Context.getTypeDeclType(ClassDecl)); 3470 3471 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3472 DiagnoseUseOfDecl(Dtor, Location); 3473 } 3474} 3475 3476void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3477 if (!CDtorDecl) 3478 return; 3479 3480 if (CXXConstructorDecl *Constructor 3481 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3482 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3483} 3484 3485bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3486 unsigned DiagID, AbstractDiagSelID SelID) { 3487 class NonAbstractTypeDiagnoser : public TypeDiagnoser { 3488 unsigned DiagID; 3489 AbstractDiagSelID SelID; 3490 3491 public: 3492 NonAbstractTypeDiagnoser(unsigned DiagID, AbstractDiagSelID SelID) 3493 : TypeDiagnoser(DiagID == 0), DiagID(DiagID), SelID(SelID) { } 3494 3495 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 3496 if (SelID == -1) 3497 S.Diag(Loc, DiagID) << T; 3498 else 3499 S.Diag(Loc, DiagID) << SelID << T; 3500 } 3501 } Diagnoser(DiagID, SelID); 3502 3503 return RequireNonAbstractType(Loc, T, Diagnoser); 3504} 3505 3506bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3507 TypeDiagnoser &Diagnoser) { 3508 if (!getLangOpts().CPlusPlus) 3509 return false; 3510 3511 if (const ArrayType *AT = Context.getAsArrayType(T)) 3512 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3513 3514 if (const PointerType *PT = T->getAs<PointerType>()) { 3515 // Find the innermost pointer type. 3516 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3517 PT = T; 3518 3519 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3520 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3521 } 3522 3523 const RecordType *RT = T->getAs<RecordType>(); 3524 if (!RT) 3525 return false; 3526 3527 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3528 3529 // We can't answer whether something is abstract until it has a 3530 // definition. If it's currently being defined, we'll walk back 3531 // over all the declarations when we have a full definition. 3532 const CXXRecordDecl *Def = RD->getDefinition(); 3533 if (!Def || Def->isBeingDefined()) 3534 return false; 3535 3536 if (!RD->isAbstract()) 3537 return false; 3538 3539 Diagnoser.diagnose(*this, Loc, T); 3540 DiagnoseAbstractType(RD); 3541 3542 return true; 3543} 3544 3545void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3546 // Check if we've already emitted the list of pure virtual functions 3547 // for this class. 3548 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3549 return; 3550 3551 CXXFinalOverriderMap FinalOverriders; 3552 RD->getFinalOverriders(FinalOverriders); 3553 3554 // Keep a set of seen pure methods so we won't diagnose the same method 3555 // more than once. 3556 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3557 3558 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3559 MEnd = FinalOverriders.end(); 3560 M != MEnd; 3561 ++M) { 3562 for (OverridingMethods::iterator SO = M->second.begin(), 3563 SOEnd = M->second.end(); 3564 SO != SOEnd; ++SO) { 3565 // C++ [class.abstract]p4: 3566 // A class is abstract if it contains or inherits at least one 3567 // pure virtual function for which the final overrider is pure 3568 // virtual. 3569 3570 // 3571 if (SO->second.size() != 1) 3572 continue; 3573 3574 if (!SO->second.front().Method->isPure()) 3575 continue; 3576 3577 if (!SeenPureMethods.insert(SO->second.front().Method)) 3578 continue; 3579 3580 Diag(SO->second.front().Method->getLocation(), 3581 diag::note_pure_virtual_function) 3582 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3583 } 3584 } 3585 3586 if (!PureVirtualClassDiagSet) 3587 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3588 PureVirtualClassDiagSet->insert(RD); 3589} 3590 3591namespace { 3592struct AbstractUsageInfo { 3593 Sema &S; 3594 CXXRecordDecl *Record; 3595 CanQualType AbstractType; 3596 bool Invalid; 3597 3598 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3599 : S(S), Record(Record), 3600 AbstractType(S.Context.getCanonicalType( 3601 S.Context.getTypeDeclType(Record))), 3602 Invalid(false) {} 3603 3604 void DiagnoseAbstractType() { 3605 if (Invalid) return; 3606 S.DiagnoseAbstractType(Record); 3607 Invalid = true; 3608 } 3609 3610 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3611}; 3612 3613struct CheckAbstractUsage { 3614 AbstractUsageInfo &Info; 3615 const NamedDecl *Ctx; 3616 3617 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3618 : Info(Info), Ctx(Ctx) {} 3619 3620 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3621 switch (TL.getTypeLocClass()) { 3622#define ABSTRACT_TYPELOC(CLASS, PARENT) 3623#define TYPELOC(CLASS, PARENT) \ 3624 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3625#include "clang/AST/TypeLocNodes.def" 3626 } 3627 } 3628 3629 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3630 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3631 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3632 if (!TL.getArg(I)) 3633 continue; 3634 3635 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3636 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3637 } 3638 } 3639 3640 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3641 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3642 } 3643 3644 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3645 // Visit the type parameters from a permissive context. 3646 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3647 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3648 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3649 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3650 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3651 // TODO: other template argument types? 3652 } 3653 } 3654 3655 // Visit pointee types from a permissive context. 3656#define CheckPolymorphic(Type) \ 3657 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3658 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3659 } 3660 CheckPolymorphic(PointerTypeLoc) 3661 CheckPolymorphic(ReferenceTypeLoc) 3662 CheckPolymorphic(MemberPointerTypeLoc) 3663 CheckPolymorphic(BlockPointerTypeLoc) 3664 CheckPolymorphic(AtomicTypeLoc) 3665 3666 /// Handle all the types we haven't given a more specific 3667 /// implementation for above. 3668 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3669 // Every other kind of type that we haven't called out already 3670 // that has an inner type is either (1) sugar or (2) contains that 3671 // inner type in some way as a subobject. 3672 if (TypeLoc Next = TL.getNextTypeLoc()) 3673 return Visit(Next, Sel); 3674 3675 // If there's no inner type and we're in a permissive context, 3676 // don't diagnose. 3677 if (Sel == Sema::AbstractNone) return; 3678 3679 // Check whether the type matches the abstract type. 3680 QualType T = TL.getType(); 3681 if (T->isArrayType()) { 3682 Sel = Sema::AbstractArrayType; 3683 T = Info.S.Context.getBaseElementType(T); 3684 } 3685 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3686 if (CT != Info.AbstractType) return; 3687 3688 // It matched; do some magic. 3689 if (Sel == Sema::AbstractArrayType) { 3690 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3691 << T << TL.getSourceRange(); 3692 } else { 3693 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3694 << Sel << T << TL.getSourceRange(); 3695 } 3696 Info.DiagnoseAbstractType(); 3697 } 3698}; 3699 3700void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3701 Sema::AbstractDiagSelID Sel) { 3702 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3703} 3704 3705} 3706 3707/// Check for invalid uses of an abstract type in a method declaration. 3708static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3709 CXXMethodDecl *MD) { 3710 // No need to do the check on definitions, which require that 3711 // the return/param types be complete. 3712 if (MD->doesThisDeclarationHaveABody()) 3713 return; 3714 3715 // For safety's sake, just ignore it if we don't have type source 3716 // information. This should never happen for non-implicit methods, 3717 // but... 3718 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3719 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3720} 3721 3722/// Check for invalid uses of an abstract type within a class definition. 3723static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3724 CXXRecordDecl *RD) { 3725 for (CXXRecordDecl::decl_iterator 3726 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3727 Decl *D = *I; 3728 if (D->isImplicit()) continue; 3729 3730 // Methods and method templates. 3731 if (isa<CXXMethodDecl>(D)) { 3732 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3733 } else if (isa<FunctionTemplateDecl>(D)) { 3734 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3735 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3736 3737 // Fields and static variables. 3738 } else if (isa<FieldDecl>(D)) { 3739 FieldDecl *FD = cast<FieldDecl>(D); 3740 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3741 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3742 } else if (isa<VarDecl>(D)) { 3743 VarDecl *VD = cast<VarDecl>(D); 3744 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3745 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3746 3747 // Nested classes and class templates. 3748 } else if (isa<CXXRecordDecl>(D)) { 3749 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3750 } else if (isa<ClassTemplateDecl>(D)) { 3751 CheckAbstractClassUsage(Info, 3752 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3753 } 3754 } 3755} 3756 3757/// \brief Perform semantic checks on a class definition that has been 3758/// completing, introducing implicitly-declared members, checking for 3759/// abstract types, etc. 3760void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3761 if (!Record) 3762 return; 3763 3764 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3765 AbstractUsageInfo Info(*this, Record); 3766 CheckAbstractClassUsage(Info, Record); 3767 } 3768 3769 // If this is not an aggregate type and has no user-declared constructor, 3770 // complain about any non-static data members of reference or const scalar 3771 // type, since they will never get initializers. 3772 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3773 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 3774 !Record->isLambda()) { 3775 bool Complained = false; 3776 for (RecordDecl::field_iterator F = Record->field_begin(), 3777 FEnd = Record->field_end(); 3778 F != FEnd; ++F) { 3779 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3780 continue; 3781 3782 if (F->getType()->isReferenceType() || 3783 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3784 if (!Complained) { 3785 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3786 << Record->getTagKind() << Record; 3787 Complained = true; 3788 } 3789 3790 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3791 << F->getType()->isReferenceType() 3792 << F->getDeclName(); 3793 } 3794 } 3795 } 3796 3797 if (Record->isDynamicClass() && !Record->isDependentType()) 3798 DynamicClasses.push_back(Record); 3799 3800 if (Record->getIdentifier()) { 3801 // C++ [class.mem]p13: 3802 // If T is the name of a class, then each of the following shall have a 3803 // name different from T: 3804 // - every member of every anonymous union that is a member of class T. 3805 // 3806 // C++ [class.mem]p14: 3807 // In addition, if class T has a user-declared constructor (12.1), every 3808 // non-static data member of class T shall have a name different from T. 3809 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3810 R.first != R.second; ++R.first) { 3811 NamedDecl *D = *R.first; 3812 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3813 isa<IndirectFieldDecl>(D)) { 3814 Diag(D->getLocation(), diag::err_member_name_of_class) 3815 << D->getDeclName(); 3816 break; 3817 } 3818 } 3819 } 3820 3821 // Warn if the class has virtual methods but non-virtual public destructor. 3822 if (Record->isPolymorphic() && !Record->isDependentType()) { 3823 CXXDestructorDecl *dtor = Record->getDestructor(); 3824 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3825 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3826 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3827 } 3828 3829 // See if a method overloads virtual methods in a base 3830 /// class without overriding any. 3831 if (!Record->isDependentType()) { 3832 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3833 MEnd = Record->method_end(); 3834 M != MEnd; ++M) { 3835 if (!M->isStatic()) 3836 DiagnoseHiddenVirtualMethods(Record, *M); 3837 } 3838 } 3839 3840 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3841 // function that is not a constructor declares that member function to be 3842 // const. [...] The class of which that function is a member shall be 3843 // a literal type. 3844 // 3845 // If the class has virtual bases, any constexpr members will already have 3846 // been diagnosed by the checks performed on the member declaration, so 3847 // suppress this (less useful) diagnostic. 3848 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3849 !Record->isLiteral() && !Record->getNumVBases()) { 3850 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3851 MEnd = Record->method_end(); 3852 M != MEnd; ++M) { 3853 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 3854 switch (Record->getTemplateSpecializationKind()) { 3855 case TSK_ImplicitInstantiation: 3856 case TSK_ExplicitInstantiationDeclaration: 3857 case TSK_ExplicitInstantiationDefinition: 3858 // If a template instantiates to a non-literal type, but its members 3859 // instantiate to constexpr functions, the template is technically 3860 // ill-formed, but we allow it for sanity. 3861 continue; 3862 3863 case TSK_Undeclared: 3864 case TSK_ExplicitSpecialization: 3865 RequireLiteralType(M->getLocation(), Context.getRecordType(Record), 3866 diag::err_constexpr_method_non_literal); 3867 break; 3868 } 3869 3870 // Only produce one error per class. 3871 break; 3872 } 3873 } 3874 } 3875 3876 // Declare inherited constructors. We do this eagerly here because: 3877 // - The standard requires an eager diagnostic for conflicting inherited 3878 // constructors from different classes. 3879 // - The lazy declaration of the other implicit constructors is so as to not 3880 // waste space and performance on classes that are not meant to be 3881 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3882 // have inherited constructors. 3883 DeclareInheritedConstructors(Record); 3884} 3885 3886void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3887 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3888 ME = Record->method_end(); 3889 MI != ME; ++MI) 3890 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) 3891 CheckExplicitlyDefaultedSpecialMember(*MI); 3892} 3893 3894/// Is the special member function which would be selected to perform the 3895/// specified operation on the specified class type a constexpr constructor? 3896static bool specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 3897 Sema::CXXSpecialMember CSM, 3898 bool ConstArg) { 3899 Sema::SpecialMemberOverloadResult *SMOR = 3900 S.LookupSpecialMember(ClassDecl, CSM, ConstArg, 3901 false, false, false, false); 3902 if (!SMOR || !SMOR->getMethod()) 3903 // A constructor we wouldn't select can't be "involved in initializing" 3904 // anything. 3905 return true; 3906 return SMOR->getMethod()->isConstexpr(); 3907} 3908 3909/// Determine whether the specified special member function would be constexpr 3910/// if it were implicitly defined. 3911static bool defaultedSpecialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 3912 Sema::CXXSpecialMember CSM, 3913 bool ConstArg) { 3914 if (!S.getLangOpts().CPlusPlus0x) 3915 return false; 3916 3917 // C++11 [dcl.constexpr]p4: 3918 // In the definition of a constexpr constructor [...] 3919 switch (CSM) { 3920 case Sema::CXXDefaultConstructor: 3921 // Since default constructor lookup is essentially trivial (and cannot 3922 // involve, for instance, template instantiation), we compute whether a 3923 // defaulted default constructor is constexpr directly within CXXRecordDecl. 3924 // 3925 // This is important for performance; we need to know whether the default 3926 // constructor is constexpr to determine whether the type is a literal type. 3927 return ClassDecl->defaultedDefaultConstructorIsConstexpr(); 3928 3929 case Sema::CXXCopyConstructor: 3930 case Sema::CXXMoveConstructor: 3931 // For copy or move constructors, we need to perform overload resolution. 3932 break; 3933 3934 case Sema::CXXCopyAssignment: 3935 case Sema::CXXMoveAssignment: 3936 case Sema::CXXDestructor: 3937 case Sema::CXXInvalid: 3938 return false; 3939 } 3940 3941 // -- if the class is a non-empty union, or for each non-empty anonymous 3942 // union member of a non-union class, exactly one non-static data member 3943 // shall be initialized; [DR1359] 3944 // 3945 // If we squint, this is guaranteed, since exactly one non-static data member 3946 // will be initialized (if the constructor isn't deleted), we just don't know 3947 // which one. 3948 if (ClassDecl->isUnion()) 3949 return true; 3950 3951 // -- the class shall not have any virtual base classes; 3952 if (ClassDecl->getNumVBases()) 3953 return false; 3954 3955 // -- every constructor involved in initializing [...] base class 3956 // sub-objects shall be a constexpr constructor; 3957 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 3958 BEnd = ClassDecl->bases_end(); 3959 B != BEnd; ++B) { 3960 const RecordType *BaseType = B->getType()->getAs<RecordType>(); 3961 if (!BaseType) continue; 3962 3963 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 3964 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, ConstArg)) 3965 return false; 3966 } 3967 3968 // -- every constructor involved in initializing non-static data members 3969 // [...] shall be a constexpr constructor; 3970 // -- every non-static data member and base class sub-object shall be 3971 // initialized 3972 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 3973 FEnd = ClassDecl->field_end(); 3974 F != FEnd; ++F) { 3975 if (F->isInvalidDecl()) 3976 continue; 3977 if (const RecordType *RecordTy = 3978 S.Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 3979 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 3980 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, ConstArg)) 3981 return false; 3982 } 3983 } 3984 3985 // All OK, it's constexpr! 3986 return true; 3987} 3988 3989static Sema::ImplicitExceptionSpecification 3990computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, CXXMethodDecl *MD) { 3991 switch (S.getSpecialMember(MD)) { 3992 case Sema::CXXDefaultConstructor: 3993 return S.ComputeDefaultedDefaultCtorExceptionSpec(Loc, MD); 3994 case Sema::CXXCopyConstructor: 3995 return S.ComputeDefaultedCopyCtorExceptionSpec(MD); 3996 case Sema::CXXCopyAssignment: 3997 return S.ComputeDefaultedCopyAssignmentExceptionSpec(MD); 3998 case Sema::CXXMoveConstructor: 3999 return S.ComputeDefaultedMoveCtorExceptionSpec(MD); 4000 case Sema::CXXMoveAssignment: 4001 return S.ComputeDefaultedMoveAssignmentExceptionSpec(MD); 4002 case Sema::CXXDestructor: 4003 return S.ComputeDefaultedDtorExceptionSpec(MD); 4004 case Sema::CXXInvalid: 4005 break; 4006 } 4007 llvm_unreachable("only special members have implicit exception specs"); 4008} 4009 4010static void 4011updateExceptionSpec(Sema &S, FunctionDecl *FD, const FunctionProtoType *FPT, 4012 const Sema::ImplicitExceptionSpecification &ExceptSpec) { 4013 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4014 ExceptSpec.getEPI(EPI); 4015 const FunctionProtoType *NewFPT = cast<FunctionProtoType>( 4016 S.Context.getFunctionType(FPT->getResultType(), FPT->arg_type_begin(), 4017 FPT->getNumArgs(), EPI)); 4018 FD->setType(QualType(NewFPT, 0)); 4019} 4020 4021void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD) { 4022 const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>(); 4023 if (FPT->getExceptionSpecType() != EST_Unevaluated) 4024 return; 4025 4026 // Evaluate the exception specification. 4027 ImplicitExceptionSpecification ExceptSpec = 4028 computeImplicitExceptionSpec(*this, Loc, MD); 4029 4030 // Update the type of the special member to use it. 4031 updateExceptionSpec(*this, MD, FPT, ExceptSpec); 4032 4033 // A user-provided destructor can be defined outside the class. When that 4034 // happens, be sure to update the exception specification on both 4035 // declarations. 4036 const FunctionProtoType *CanonicalFPT = 4037 MD->getCanonicalDecl()->getType()->castAs<FunctionProtoType>(); 4038 if (CanonicalFPT->getExceptionSpecType() == EST_Unevaluated) 4039 updateExceptionSpec(*this, MD->getCanonicalDecl(), 4040 CanonicalFPT, ExceptSpec); 4041} 4042 4043static bool isImplicitCopyCtorArgConst(Sema &S, CXXRecordDecl *ClassDecl); 4044static bool isImplicitCopyAssignmentArgConst(Sema &S, CXXRecordDecl *ClassDecl); 4045 4046void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) { 4047 CXXRecordDecl *RD = MD->getParent(); 4048 CXXSpecialMember CSM = getSpecialMember(MD); 4049 4050 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid && 4051 "not an explicitly-defaulted special member"); 4052 4053 // Whether this was the first-declared instance of the constructor. 4054 // This affects whether we implicitly add an exception spec and constexpr. 4055 bool First = MD == MD->getCanonicalDecl(); 4056 4057 bool HadError = false; 4058 4059 // C++11 [dcl.fct.def.default]p1: 4060 // A function that is explicitly defaulted shall 4061 // -- be a special member function (checked elsewhere), 4062 // -- have the same type (except for ref-qualifiers, and except that a 4063 // copy operation can take a non-const reference) as an implicit 4064 // declaration, and 4065 // -- not have default arguments. 4066 unsigned ExpectedParams = 1; 4067 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor) 4068 ExpectedParams = 0; 4069 if (MD->getNumParams() != ExpectedParams) { 4070 // This also checks for default arguments: a copy or move constructor with a 4071 // default argument is classified as a default constructor, and assignment 4072 // operations and destructors can't have default arguments. 4073 Diag(MD->getLocation(), diag::err_defaulted_special_member_params) 4074 << CSM << MD->getSourceRange(); 4075 HadError = true; 4076 } 4077 4078 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>(); 4079 4080 // Compute argument constness, constexpr, and triviality. 4081 bool CanHaveConstParam = false; 4082 bool Trivial; 4083 switch (CSM) { 4084 case CXXDefaultConstructor: 4085 Trivial = RD->hasTrivialDefaultConstructor(); 4086 break; 4087 case CXXCopyConstructor: 4088 CanHaveConstParam = isImplicitCopyCtorArgConst(*this, RD); 4089 Trivial = RD->hasTrivialCopyConstructor(); 4090 break; 4091 case CXXCopyAssignment: 4092 CanHaveConstParam = isImplicitCopyAssignmentArgConst(*this, RD); 4093 Trivial = RD->hasTrivialCopyAssignment(); 4094 break; 4095 case CXXMoveConstructor: 4096 Trivial = RD->hasTrivialMoveConstructor(); 4097 break; 4098 case CXXMoveAssignment: 4099 Trivial = RD->hasTrivialMoveAssignment(); 4100 break; 4101 case CXXDestructor: 4102 Trivial = RD->hasTrivialDestructor(); 4103 break; 4104 case CXXInvalid: 4105 llvm_unreachable("non-special member explicitly defaulted!"); 4106 } 4107 4108 QualType ReturnType = Context.VoidTy; 4109 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) { 4110 // Check for return type matching. 4111 ReturnType = Type->getResultType(); 4112 QualType ExpectedReturnType = 4113 Context.getLValueReferenceType(Context.getTypeDeclType(RD)); 4114 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) { 4115 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type) 4116 << (CSM == CXXMoveAssignment) << ExpectedReturnType; 4117 HadError = true; 4118 } 4119 4120 // A defaulted special member cannot have cv-qualifiers. 4121 if (Type->getTypeQuals()) { 4122 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals) 4123 << (CSM == CXXMoveAssignment); 4124 HadError = true; 4125 } 4126 } 4127 4128 // Check for parameter type matching. 4129 QualType ArgType = ExpectedParams ? Type->getArgType(0) : QualType(); 4130 bool HasConstParam = false; 4131 if (ExpectedParams && ArgType->isReferenceType()) { 4132 // Argument must be reference to possibly-const T. 4133 QualType ReferentType = ArgType->getPointeeType(); 4134 HasConstParam = ReferentType.isConstQualified(); 4135 4136 if (ReferentType.isVolatileQualified()) { 4137 Diag(MD->getLocation(), 4138 diag::err_defaulted_special_member_volatile_param) << CSM; 4139 HadError = true; 4140 } 4141 4142 if (HasConstParam && !CanHaveConstParam) { 4143 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) { 4144 Diag(MD->getLocation(), 4145 diag::err_defaulted_special_member_copy_const_param) 4146 << (CSM == CXXCopyAssignment); 4147 // FIXME: Explain why this special member can't be const. 4148 } else { 4149 Diag(MD->getLocation(), 4150 diag::err_defaulted_special_member_move_const_param) 4151 << (CSM == CXXMoveAssignment); 4152 } 4153 HadError = true; 4154 } 4155 4156 // If a function is explicitly defaulted on its first declaration, it shall 4157 // have the same parameter type as if it had been implicitly declared. 4158 // (Presumably this is to prevent it from being trivial?) 4159 if (!HasConstParam && CanHaveConstParam && First) 4160 Diag(MD->getLocation(), 4161 diag::err_defaulted_special_member_copy_non_const_param) 4162 << (CSM == CXXCopyAssignment); 4163 } else if (ExpectedParams) { 4164 // A copy assignment operator can take its argument by value, but a 4165 // defaulted one cannot. 4166 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument"); 4167 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4168 HadError = true; 4169 } 4170 4171 // Rebuild the type with the implicit exception specification added, if we 4172 // are going to need it. 4173 const FunctionProtoType *ImplicitType = 0; 4174 if (First || Type->hasExceptionSpec()) { 4175 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo(); 4176 computeImplicitExceptionSpec(*this, MD->getLocation(), MD).getEPI(EPI); 4177 ImplicitType = cast<FunctionProtoType>( 4178 Context.getFunctionType(ReturnType, &ArgType, ExpectedParams, EPI)); 4179 } 4180 4181 // C++11 [dcl.fct.def.default]p2: 4182 // An explicitly-defaulted function may be declared constexpr only if it 4183 // would have been implicitly declared as constexpr, 4184 // Do not apply this rule to members of class templates, since core issue 1358 4185 // makes such functions always instantiate to constexpr functions. For 4186 // non-constructors, this is checked elsewhere. 4187 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM, 4188 HasConstParam); 4189 if (isa<CXXConstructorDecl>(MD) && MD->isConstexpr() && !Constexpr && 4190 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4191 Diag(MD->getLocStart(), diag::err_incorrect_defaulted_constexpr) << CSM; 4192 // FIXME: Explain why the constructor can't be constexpr. 4193 HadError = true; 4194 } 4195 // and may have an explicit exception-specification only if it is compatible 4196 // with the exception-specification on the implicit declaration. 4197 if (Type->hasExceptionSpec() && 4198 CheckEquivalentExceptionSpec( 4199 PDiag(diag::err_incorrect_defaulted_exception_spec) << CSM, 4200 PDiag(), ImplicitType, SourceLocation(), Type, MD->getLocation())) 4201 HadError = true; 4202 4203 // If a function is explicitly defaulted on its first declaration, 4204 if (First) { 4205 // -- it is implicitly considered to be constexpr if the implicit 4206 // definition would be, 4207 MD->setConstexpr(Constexpr); 4208 4209 // -- it is implicitly considered to have the same exception-specification 4210 // as if it had been implicitly declared, 4211 MD->setType(QualType(ImplicitType, 0)); 4212 4213 // Such a function is also trivial if the implicitly-declared function 4214 // would have been. 4215 MD->setTrivial(Trivial); 4216 } 4217 4218 if (ShouldDeleteSpecialMember(MD, CSM)) { 4219 if (First) { 4220 MD->setDeletedAsWritten(); 4221 } else { 4222 // C++11 [dcl.fct.def.default]p4: 4223 // [For a] user-provided explicitly-defaulted function [...] if such a 4224 // function is implicitly defined as deleted, the program is ill-formed. 4225 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM; 4226 HadError = true; 4227 } 4228 } 4229 4230 if (HadError) 4231 MD->setInvalidDecl(); 4232} 4233 4234namespace { 4235struct SpecialMemberDeletionInfo { 4236 Sema &S; 4237 CXXMethodDecl *MD; 4238 Sema::CXXSpecialMember CSM; 4239 bool Diagnose; 4240 4241 // Properties of the special member, computed for convenience. 4242 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4243 SourceLocation Loc; 4244 4245 bool AllFieldsAreConst; 4246 4247 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4248 Sema::CXXSpecialMember CSM, bool Diagnose) 4249 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose), 4250 IsConstructor(false), IsAssignment(false), IsMove(false), 4251 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4252 AllFieldsAreConst(true) { 4253 switch (CSM) { 4254 case Sema::CXXDefaultConstructor: 4255 case Sema::CXXCopyConstructor: 4256 IsConstructor = true; 4257 break; 4258 case Sema::CXXMoveConstructor: 4259 IsConstructor = true; 4260 IsMove = true; 4261 break; 4262 case Sema::CXXCopyAssignment: 4263 IsAssignment = true; 4264 break; 4265 case Sema::CXXMoveAssignment: 4266 IsAssignment = true; 4267 IsMove = true; 4268 break; 4269 case Sema::CXXDestructor: 4270 break; 4271 case Sema::CXXInvalid: 4272 llvm_unreachable("invalid special member kind"); 4273 } 4274 4275 if (MD->getNumParams()) { 4276 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4277 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4278 } 4279 } 4280 4281 bool inUnion() const { return MD->getParent()->isUnion(); } 4282 4283 /// Look up the corresponding special member in the given class. 4284 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class, 4285 unsigned Quals) { 4286 unsigned TQ = MD->getTypeQualifiers(); 4287 // cv-qualifiers on class members don't affect default ctor / dtor calls. 4288 if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor) 4289 Quals = 0; 4290 return S.LookupSpecialMember(Class, CSM, 4291 ConstArg || (Quals & Qualifiers::Const), 4292 VolatileArg || (Quals & Qualifiers::Volatile), 4293 MD->getRefQualifier() == RQ_RValue, 4294 TQ & Qualifiers::Const, 4295 TQ & Qualifiers::Volatile); 4296 } 4297 4298 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; 4299 4300 bool shouldDeleteForBase(CXXBaseSpecifier *Base); 4301 bool shouldDeleteForField(FieldDecl *FD); 4302 bool shouldDeleteForAllConstMembers(); 4303 4304 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj, 4305 unsigned Quals); 4306 bool shouldDeleteForSubobjectCall(Subobject Subobj, 4307 Sema::SpecialMemberOverloadResult *SMOR, 4308 bool IsDtorCallInCtor); 4309 4310 bool isAccessible(Subobject Subobj, CXXMethodDecl *D); 4311}; 4312} 4313 4314/// Is the given special member inaccessible when used on the given 4315/// sub-object. 4316bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, 4317 CXXMethodDecl *target) { 4318 /// If we're operating on a base class, the object type is the 4319 /// type of this special member. 4320 QualType objectTy; 4321 AccessSpecifier access = target->getAccess();; 4322 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { 4323 objectTy = S.Context.getTypeDeclType(MD->getParent()); 4324 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); 4325 4326 // If we're operating on a field, the object type is the type of the field. 4327 } else { 4328 objectTy = S.Context.getTypeDeclType(target->getParent()); 4329 } 4330 4331 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy); 4332} 4333 4334/// Check whether we should delete a special member due to the implicit 4335/// definition containing a call to a special member of a subobject. 4336bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( 4337 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR, 4338 bool IsDtorCallInCtor) { 4339 CXXMethodDecl *Decl = SMOR->getMethod(); 4340 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4341 4342 int DiagKind = -1; 4343 4344 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) 4345 DiagKind = !Decl ? 0 : 1; 4346 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4347 DiagKind = 2; 4348 else if (!isAccessible(Subobj, Decl)) 4349 DiagKind = 3; 4350 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && 4351 !Decl->isTrivial()) { 4352 // A member of a union must have a trivial corresponding special member. 4353 // As a weird special case, a destructor call from a union's constructor 4354 // must be accessible and non-deleted, but need not be trivial. Such a 4355 // destructor is never actually called, but is semantically checked as 4356 // if it were. 4357 DiagKind = 4; 4358 } 4359 4360 if (DiagKind == -1) 4361 return false; 4362 4363 if (Diagnose) { 4364 if (Field) { 4365 S.Diag(Field->getLocation(), 4366 diag::note_deleted_special_member_class_subobject) 4367 << CSM << MD->getParent() << /*IsField*/true 4368 << Field << DiagKind << IsDtorCallInCtor; 4369 } else { 4370 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); 4371 S.Diag(Base->getLocStart(), 4372 diag::note_deleted_special_member_class_subobject) 4373 << CSM << MD->getParent() << /*IsField*/false 4374 << Base->getType() << DiagKind << IsDtorCallInCtor; 4375 } 4376 4377 if (DiagKind == 1) 4378 S.NoteDeletedFunction(Decl); 4379 // FIXME: Explain inaccessibility if DiagKind == 3. 4380 } 4381 4382 return true; 4383} 4384 4385/// Check whether we should delete a special member function due to having a 4386/// direct or virtual base class or non-static data member of class type M. 4387bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 4388 CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) { 4389 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4390 4391 // C++11 [class.ctor]p5: 4392 // -- any direct or virtual base class, or non-static data member with no 4393 // brace-or-equal-initializer, has class type M (or array thereof) and 4394 // either M has no default constructor or overload resolution as applied 4395 // to M's default constructor results in an ambiguity or in a function 4396 // that is deleted or inaccessible 4397 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4398 // -- a direct or virtual base class B that cannot be copied/moved because 4399 // overload resolution, as applied to B's corresponding special member, 4400 // results in an ambiguity or a function that is deleted or inaccessible 4401 // from the defaulted special member 4402 // C++11 [class.dtor]p5: 4403 // -- any direct or virtual base class [...] has a type with a destructor 4404 // that is deleted or inaccessible 4405 if (!(CSM == Sema::CXXDefaultConstructor && 4406 Field && Field->hasInClassInitializer()) && 4407 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals), false)) 4408 return true; 4409 4410 // C++11 [class.ctor]p5, C++11 [class.copy]p11: 4411 // -- any direct or virtual base class or non-static data member has a 4412 // type with a destructor that is deleted or inaccessible 4413 if (IsConstructor) { 4414 Sema::SpecialMemberOverloadResult *SMOR = 4415 S.LookupSpecialMember(Class, Sema::CXXDestructor, 4416 false, false, false, false, false); 4417 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) 4418 return true; 4419 } 4420 4421 return false; 4422} 4423 4424/// Check whether we should delete a special member function due to the class 4425/// having a particular direct or virtual base class. 4426bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { 4427 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); 4428 return shouldDeleteForClassSubobject(BaseClass, Base, 0); 4429} 4430 4431/// Check whether we should delete a special member function due to the class 4432/// having a particular non-static data member. 4433bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4434 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4435 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4436 4437 if (CSM == Sema::CXXDefaultConstructor) { 4438 // For a default constructor, all references must be initialized in-class 4439 // and, if a union, it must have a non-const member. 4440 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { 4441 if (Diagnose) 4442 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4443 << MD->getParent() << FD << FieldType << /*Reference*/0; 4444 return true; 4445 } 4446 // C++11 [class.ctor]p5: any non-variant non-static data member of 4447 // const-qualified type (or array thereof) with no 4448 // brace-or-equal-initializer does not have a user-provided default 4449 // constructor. 4450 if (!inUnion() && FieldType.isConstQualified() && 4451 !FD->hasInClassInitializer() && 4452 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { 4453 if (Diagnose) 4454 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4455 << MD->getParent() << FD << FD->getType() << /*Const*/1; 4456 return true; 4457 } 4458 4459 if (inUnion() && !FieldType.isConstQualified()) 4460 AllFieldsAreConst = false; 4461 } else if (CSM == Sema::CXXCopyConstructor) { 4462 // For a copy constructor, data members must not be of rvalue reference 4463 // type. 4464 if (FieldType->isRValueReferenceType()) { 4465 if (Diagnose) 4466 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) 4467 << MD->getParent() << FD << FieldType; 4468 return true; 4469 } 4470 } else if (IsAssignment) { 4471 // For an assignment operator, data members must not be of reference type. 4472 if (FieldType->isReferenceType()) { 4473 if (Diagnose) 4474 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4475 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0; 4476 return true; 4477 } 4478 if (!FieldRecord && FieldType.isConstQualified()) { 4479 // C++11 [class.copy]p23: 4480 // -- a non-static data member of const non-class type (or array thereof) 4481 if (Diagnose) 4482 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4483 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1; 4484 return true; 4485 } 4486 } 4487 4488 if (FieldRecord) { 4489 // Some additional restrictions exist on the variant members. 4490 if (!inUnion() && FieldRecord->isUnion() && 4491 FieldRecord->isAnonymousStructOrUnion()) { 4492 bool AllVariantFieldsAreConst = true; 4493 4494 // FIXME: Handle anonymous unions declared within anonymous unions. 4495 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4496 UE = FieldRecord->field_end(); 4497 UI != UE; ++UI) { 4498 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4499 4500 if (!UnionFieldType.isConstQualified()) 4501 AllVariantFieldsAreConst = false; 4502 4503 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 4504 if (UnionFieldRecord && 4505 shouldDeleteForClassSubobject(UnionFieldRecord, *UI, 4506 UnionFieldType.getCVRQualifiers())) 4507 return true; 4508 } 4509 4510 // At least one member in each anonymous union must be non-const 4511 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 4512 FieldRecord->field_begin() != FieldRecord->field_end()) { 4513 if (Diagnose) 4514 S.Diag(FieldRecord->getLocation(), 4515 diag::note_deleted_default_ctor_all_const) 4516 << MD->getParent() << /*anonymous union*/1; 4517 return true; 4518 } 4519 4520 // Don't check the implicit member of the anonymous union type. 4521 // This is technically non-conformant, but sanity demands it. 4522 return false; 4523 } 4524 4525 if (shouldDeleteForClassSubobject(FieldRecord, FD, 4526 FieldType.getCVRQualifiers())) 4527 return true; 4528 } 4529 4530 return false; 4531} 4532 4533/// C++11 [class.ctor] p5: 4534/// A defaulted default constructor for a class X is defined as deleted if 4535/// X is a union and all of its variant members are of const-qualified type. 4536bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4537 // This is a silly definition, because it gives an empty union a deleted 4538 // default constructor. Don't do that. 4539 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 4540 (MD->getParent()->field_begin() != MD->getParent()->field_end())) { 4541 if (Diagnose) 4542 S.Diag(MD->getParent()->getLocation(), 4543 diag::note_deleted_default_ctor_all_const) 4544 << MD->getParent() << /*not anonymous union*/0; 4545 return true; 4546 } 4547 return false; 4548} 4549 4550/// Determine whether a defaulted special member function should be defined as 4551/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4552/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4553bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, 4554 bool Diagnose) { 4555 assert(!MD->isInvalidDecl()); 4556 CXXRecordDecl *RD = MD->getParent(); 4557 assert(!RD->isDependentType() && "do deletion after instantiation"); 4558 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4559 return false; 4560 4561 // C++11 [expr.lambda.prim]p19: 4562 // The closure type associated with a lambda-expression has a 4563 // deleted (8.4.3) default constructor and a deleted copy 4564 // assignment operator. 4565 if (RD->isLambda() && 4566 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { 4567 if (Diagnose) 4568 Diag(RD->getLocation(), diag::note_lambda_decl); 4569 return true; 4570 } 4571 4572 // For an anonymous struct or union, the copy and assignment special members 4573 // will never be used, so skip the check. For an anonymous union declared at 4574 // namespace scope, the constructor and destructor are used. 4575 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4576 RD->isAnonymousStructOrUnion()) 4577 return false; 4578 4579 // C++11 [class.copy]p7, p18: 4580 // If the class definition declares a move constructor or move assignment 4581 // operator, an implicitly declared copy constructor or copy assignment 4582 // operator is defined as deleted. 4583 if (MD->isImplicit() && 4584 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { 4585 CXXMethodDecl *UserDeclaredMove = 0; 4586 4587 // In Microsoft mode, a user-declared move only causes the deletion of the 4588 // corresponding copy operation, not both copy operations. 4589 if (RD->hasUserDeclaredMoveConstructor() && 4590 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) { 4591 if (!Diagnose) return true; 4592 UserDeclaredMove = RD->getMoveConstructor(); 4593 assert(UserDeclaredMove); 4594 } else if (RD->hasUserDeclaredMoveAssignment() && 4595 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) { 4596 if (!Diagnose) return true; 4597 UserDeclaredMove = RD->getMoveAssignmentOperator(); 4598 assert(UserDeclaredMove); 4599 } 4600 4601 if (UserDeclaredMove) { 4602 Diag(UserDeclaredMove->getLocation(), 4603 diag::note_deleted_copy_user_declared_move) 4604 << (CSM == CXXCopyAssignment) << RD 4605 << UserDeclaredMove->isMoveAssignmentOperator(); 4606 return true; 4607 } 4608 } 4609 4610 // Do access control from the special member function 4611 ContextRAII MethodContext(*this, MD); 4612 4613 // C++11 [class.dtor]p5: 4614 // -- for a virtual destructor, lookup of the non-array deallocation function 4615 // results in an ambiguity or in a function that is deleted or inaccessible 4616 if (CSM == CXXDestructor && MD->isVirtual()) { 4617 FunctionDecl *OperatorDelete = 0; 4618 DeclarationName Name = 4619 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4620 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 4621 OperatorDelete, false)) { 4622 if (Diagnose) 4623 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); 4624 return true; 4625 } 4626 } 4627 4628 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose); 4629 4630 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4631 BE = RD->bases_end(); BI != BE; ++BI) 4632 if (!BI->isVirtual() && 4633 SMI.shouldDeleteForBase(BI)) 4634 return true; 4635 4636 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4637 BE = RD->vbases_end(); BI != BE; ++BI) 4638 if (SMI.shouldDeleteForBase(BI)) 4639 return true; 4640 4641 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4642 FE = RD->field_end(); FI != FE; ++FI) 4643 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 4644 SMI.shouldDeleteForField(*FI)) 4645 return true; 4646 4647 if (SMI.shouldDeleteForAllConstMembers()) 4648 return true; 4649 4650 return false; 4651} 4652 4653/// \brief Data used with FindHiddenVirtualMethod 4654namespace { 4655 struct FindHiddenVirtualMethodData { 4656 Sema *S; 4657 CXXMethodDecl *Method; 4658 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4659 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4660 }; 4661} 4662 4663/// \brief Member lookup function that determines whether a given C++ 4664/// method overloads virtual methods in a base class without overriding any, 4665/// to be used with CXXRecordDecl::lookupInBases(). 4666static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4667 CXXBasePath &Path, 4668 void *UserData) { 4669 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4670 4671 FindHiddenVirtualMethodData &Data 4672 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4673 4674 DeclarationName Name = Data.Method->getDeclName(); 4675 assert(Name.getNameKind() == DeclarationName::Identifier); 4676 4677 bool foundSameNameMethod = false; 4678 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4679 for (Path.Decls = BaseRecord->lookup(Name); 4680 Path.Decls.first != Path.Decls.second; 4681 ++Path.Decls.first) { 4682 NamedDecl *D = *Path.Decls.first; 4683 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4684 MD = MD->getCanonicalDecl(); 4685 foundSameNameMethod = true; 4686 // Interested only in hidden virtual methods. 4687 if (!MD->isVirtual()) 4688 continue; 4689 // If the method we are checking overrides a method from its base 4690 // don't warn about the other overloaded methods. 4691 if (!Data.S->IsOverload(Data.Method, MD, false)) 4692 return true; 4693 // Collect the overload only if its hidden. 4694 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4695 overloadedMethods.push_back(MD); 4696 } 4697 } 4698 4699 if (foundSameNameMethod) 4700 Data.OverloadedMethods.append(overloadedMethods.begin(), 4701 overloadedMethods.end()); 4702 return foundSameNameMethod; 4703} 4704 4705/// \brief See if a method overloads virtual methods in a base class without 4706/// overriding any. 4707void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4708 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4709 MD->getLocation()) == DiagnosticsEngine::Ignored) 4710 return; 4711 if (!MD->getDeclName().isIdentifier()) 4712 return; 4713 4714 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4715 /*bool RecordPaths=*/false, 4716 /*bool DetectVirtual=*/false); 4717 FindHiddenVirtualMethodData Data; 4718 Data.Method = MD; 4719 Data.S = this; 4720 4721 // Keep the base methods that were overriden or introduced in the subclass 4722 // by 'using' in a set. A base method not in this set is hidden. 4723 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4724 res.first != res.second; ++res.first) { 4725 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4726 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4727 E = MD->end_overridden_methods(); 4728 I != E; ++I) 4729 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4730 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4731 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4732 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4733 } 4734 4735 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4736 !Data.OverloadedMethods.empty()) { 4737 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4738 << MD << (Data.OverloadedMethods.size() > 1); 4739 4740 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4741 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4742 Diag(overloadedMD->getLocation(), 4743 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4744 } 4745 } 4746} 4747 4748void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4749 Decl *TagDecl, 4750 SourceLocation LBrac, 4751 SourceLocation RBrac, 4752 AttributeList *AttrList) { 4753 if (!TagDecl) 4754 return; 4755 4756 AdjustDeclIfTemplate(TagDecl); 4757 4758 for (const AttributeList* l = AttrList; l; l = l->getNext()) { 4759 if (l->getKind() != AttributeList::AT_Visibility) 4760 continue; 4761 l->setInvalid(); 4762 Diag(l->getLoc(), diag::warn_attribute_after_definition_ignored) << 4763 l->getName(); 4764 } 4765 4766 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4767 // strict aliasing violation! 4768 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4769 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4770 4771 CheckCompletedCXXClass( 4772 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4773} 4774 4775/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4776/// special functions, such as the default constructor, copy 4777/// constructor, or destructor, to the given C++ class (C++ 4778/// [special]p1). This routine can only be executed just before the 4779/// definition of the class is complete. 4780void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4781 if (!ClassDecl->hasUserDeclaredConstructor()) 4782 ++ASTContext::NumImplicitDefaultConstructors; 4783 4784 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4785 ++ASTContext::NumImplicitCopyConstructors; 4786 4787 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 4788 ++ASTContext::NumImplicitMoveConstructors; 4789 4790 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4791 ++ASTContext::NumImplicitCopyAssignmentOperators; 4792 4793 // If we have a dynamic class, then the copy assignment operator may be 4794 // virtual, so we have to declare it immediately. This ensures that, e.g., 4795 // it shows up in the right place in the vtable and that we diagnose 4796 // problems with the implicit exception specification. 4797 if (ClassDecl->isDynamicClass()) 4798 DeclareImplicitCopyAssignment(ClassDecl); 4799 } 4800 4801 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()) { 4802 ++ASTContext::NumImplicitMoveAssignmentOperators; 4803 4804 // Likewise for the move assignment operator. 4805 if (ClassDecl->isDynamicClass()) 4806 DeclareImplicitMoveAssignment(ClassDecl); 4807 } 4808 4809 if (!ClassDecl->hasUserDeclaredDestructor()) { 4810 ++ASTContext::NumImplicitDestructors; 4811 4812 // If we have a dynamic class, then the destructor may be virtual, so we 4813 // have to declare the destructor immediately. This ensures that, e.g., it 4814 // shows up in the right place in the vtable and that we diagnose problems 4815 // with the implicit exception specification. 4816 if (ClassDecl->isDynamicClass()) 4817 DeclareImplicitDestructor(ClassDecl); 4818 } 4819} 4820 4821void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4822 if (!D) 4823 return; 4824 4825 int NumParamList = D->getNumTemplateParameterLists(); 4826 for (int i = 0; i < NumParamList; i++) { 4827 TemplateParameterList* Params = D->getTemplateParameterList(i); 4828 for (TemplateParameterList::iterator Param = Params->begin(), 4829 ParamEnd = Params->end(); 4830 Param != ParamEnd; ++Param) { 4831 NamedDecl *Named = cast<NamedDecl>(*Param); 4832 if (Named->getDeclName()) { 4833 S->AddDecl(Named); 4834 IdResolver.AddDecl(Named); 4835 } 4836 } 4837 } 4838} 4839 4840void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4841 if (!D) 4842 return; 4843 4844 TemplateParameterList *Params = 0; 4845 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4846 Params = Template->getTemplateParameters(); 4847 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4848 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4849 Params = PartialSpec->getTemplateParameters(); 4850 else 4851 return; 4852 4853 for (TemplateParameterList::iterator Param = Params->begin(), 4854 ParamEnd = Params->end(); 4855 Param != ParamEnd; ++Param) { 4856 NamedDecl *Named = cast<NamedDecl>(*Param); 4857 if (Named->getDeclName()) { 4858 S->AddDecl(Named); 4859 IdResolver.AddDecl(Named); 4860 } 4861 } 4862} 4863 4864void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4865 if (!RecordD) return; 4866 AdjustDeclIfTemplate(RecordD); 4867 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4868 PushDeclContext(S, Record); 4869} 4870 4871void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4872 if (!RecordD) return; 4873 PopDeclContext(); 4874} 4875 4876/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4877/// parsing a top-level (non-nested) C++ class, and we are now 4878/// parsing those parts of the given Method declaration that could 4879/// not be parsed earlier (C++ [class.mem]p2), such as default 4880/// arguments. This action should enter the scope of the given 4881/// Method declaration as if we had just parsed the qualified method 4882/// name. However, it should not bring the parameters into scope; 4883/// that will be performed by ActOnDelayedCXXMethodParameter. 4884void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4885} 4886 4887/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4888/// C++ method declaration. We're (re-)introducing the given 4889/// function parameter into scope for use in parsing later parts of 4890/// the method declaration. For example, we could see an 4891/// ActOnParamDefaultArgument event for this parameter. 4892void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4893 if (!ParamD) 4894 return; 4895 4896 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4897 4898 // If this parameter has an unparsed default argument, clear it out 4899 // to make way for the parsed default argument. 4900 if (Param->hasUnparsedDefaultArg()) 4901 Param->setDefaultArg(0); 4902 4903 S->AddDecl(Param); 4904 if (Param->getDeclName()) 4905 IdResolver.AddDecl(Param); 4906} 4907 4908/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4909/// processing the delayed method declaration for Method. The method 4910/// declaration is now considered finished. There may be a separate 4911/// ActOnStartOfFunctionDef action later (not necessarily 4912/// immediately!) for this method, if it was also defined inside the 4913/// class body. 4914void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4915 if (!MethodD) 4916 return; 4917 4918 AdjustDeclIfTemplate(MethodD); 4919 4920 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4921 4922 // Now that we have our default arguments, check the constructor 4923 // again. It could produce additional diagnostics or affect whether 4924 // the class has implicitly-declared destructors, among other 4925 // things. 4926 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4927 CheckConstructor(Constructor); 4928 4929 // Check the default arguments, which we may have added. 4930 if (!Method->isInvalidDecl()) 4931 CheckCXXDefaultArguments(Method); 4932} 4933 4934/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4935/// the well-formedness of the constructor declarator @p D with type @p 4936/// R. If there are any errors in the declarator, this routine will 4937/// emit diagnostics and set the invalid bit to true. In any case, the type 4938/// will be updated to reflect a well-formed type for the constructor and 4939/// returned. 4940QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4941 StorageClass &SC) { 4942 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4943 4944 // C++ [class.ctor]p3: 4945 // A constructor shall not be virtual (10.3) or static (9.4). A 4946 // constructor can be invoked for a const, volatile or const 4947 // volatile object. A constructor shall not be declared const, 4948 // volatile, or const volatile (9.3.2). 4949 if (isVirtual) { 4950 if (!D.isInvalidType()) 4951 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4952 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4953 << SourceRange(D.getIdentifierLoc()); 4954 D.setInvalidType(); 4955 } 4956 if (SC == SC_Static) { 4957 if (!D.isInvalidType()) 4958 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4959 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4960 << SourceRange(D.getIdentifierLoc()); 4961 D.setInvalidType(); 4962 SC = SC_None; 4963 } 4964 4965 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4966 if (FTI.TypeQuals != 0) { 4967 if (FTI.TypeQuals & Qualifiers::Const) 4968 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4969 << "const" << SourceRange(D.getIdentifierLoc()); 4970 if (FTI.TypeQuals & Qualifiers::Volatile) 4971 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4972 << "volatile" << SourceRange(D.getIdentifierLoc()); 4973 if (FTI.TypeQuals & Qualifiers::Restrict) 4974 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4975 << "restrict" << SourceRange(D.getIdentifierLoc()); 4976 D.setInvalidType(); 4977 } 4978 4979 // C++0x [class.ctor]p4: 4980 // A constructor shall not be declared with a ref-qualifier. 4981 if (FTI.hasRefQualifier()) { 4982 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 4983 << FTI.RefQualifierIsLValueRef 4984 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4985 D.setInvalidType(); 4986 } 4987 4988 // Rebuild the function type "R" without any type qualifiers (in 4989 // case any of the errors above fired) and with "void" as the 4990 // return type, since constructors don't have return types. 4991 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4992 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 4993 return R; 4994 4995 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4996 EPI.TypeQuals = 0; 4997 EPI.RefQualifier = RQ_None; 4998 4999 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5000 Proto->getNumArgs(), EPI); 5001} 5002 5003/// CheckConstructor - Checks a fully-formed constructor for 5004/// well-formedness, issuing any diagnostics required. Returns true if 5005/// the constructor declarator is invalid. 5006void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5007 CXXRecordDecl *ClassDecl 5008 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5009 if (!ClassDecl) 5010 return Constructor->setInvalidDecl(); 5011 5012 // C++ [class.copy]p3: 5013 // A declaration of a constructor for a class X is ill-formed if 5014 // its first parameter is of type (optionally cv-qualified) X and 5015 // either there are no other parameters or else all other 5016 // parameters have default arguments. 5017 if (!Constructor->isInvalidDecl() && 5018 ((Constructor->getNumParams() == 1) || 5019 (Constructor->getNumParams() > 1 && 5020 Constructor->getParamDecl(1)->hasDefaultArg())) && 5021 Constructor->getTemplateSpecializationKind() 5022 != TSK_ImplicitInstantiation) { 5023 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5024 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5025 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5026 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5027 const char *ConstRef 5028 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5029 : " const &"; 5030 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5031 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5032 5033 // FIXME: Rather that making the constructor invalid, we should endeavor 5034 // to fix the type. 5035 Constructor->setInvalidDecl(); 5036 } 5037 } 5038} 5039 5040/// CheckDestructor - Checks a fully-formed destructor definition for 5041/// well-formedness, issuing any diagnostics required. Returns true 5042/// on error. 5043bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5044 CXXRecordDecl *RD = Destructor->getParent(); 5045 5046 if (Destructor->isVirtual()) { 5047 SourceLocation Loc; 5048 5049 if (!Destructor->isImplicit()) 5050 Loc = Destructor->getLocation(); 5051 else 5052 Loc = RD->getLocation(); 5053 5054 // If we have a virtual destructor, look up the deallocation function 5055 FunctionDecl *OperatorDelete = 0; 5056 DeclarationName Name = 5057 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5058 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5059 return true; 5060 5061 MarkFunctionReferenced(Loc, OperatorDelete); 5062 5063 Destructor->setOperatorDelete(OperatorDelete); 5064 } 5065 5066 return false; 5067} 5068 5069static inline bool 5070FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5071 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5072 FTI.ArgInfo[0].Param && 5073 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5074} 5075 5076/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5077/// the well-formednes of the destructor declarator @p D with type @p 5078/// R. If there are any errors in the declarator, this routine will 5079/// emit diagnostics and set the declarator to invalid. Even if this happens, 5080/// will be updated to reflect a well-formed type for the destructor and 5081/// returned. 5082QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5083 StorageClass& SC) { 5084 // C++ [class.dtor]p1: 5085 // [...] A typedef-name that names a class is a class-name 5086 // (7.1.3); however, a typedef-name that names a class shall not 5087 // be used as the identifier in the declarator for a destructor 5088 // declaration. 5089 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5090 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5091 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5092 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5093 else if (const TemplateSpecializationType *TST = 5094 DeclaratorType->getAs<TemplateSpecializationType>()) 5095 if (TST->isTypeAlias()) 5096 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5097 << DeclaratorType << 1; 5098 5099 // C++ [class.dtor]p2: 5100 // A destructor is used to destroy objects of its class type. A 5101 // destructor takes no parameters, and no return type can be 5102 // specified for it (not even void). The address of a destructor 5103 // shall not be taken. A destructor shall not be static. A 5104 // destructor can be invoked for a const, volatile or const 5105 // volatile object. A destructor shall not be declared const, 5106 // volatile or const volatile (9.3.2). 5107 if (SC == SC_Static) { 5108 if (!D.isInvalidType()) 5109 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5110 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5111 << SourceRange(D.getIdentifierLoc()) 5112 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5113 5114 SC = SC_None; 5115 } 5116 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5117 // Destructors don't have return types, but the parser will 5118 // happily parse something like: 5119 // 5120 // class X { 5121 // float ~X(); 5122 // }; 5123 // 5124 // The return type will be eliminated later. 5125 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5126 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5127 << SourceRange(D.getIdentifierLoc()); 5128 } 5129 5130 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5131 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5132 if (FTI.TypeQuals & Qualifiers::Const) 5133 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5134 << "const" << SourceRange(D.getIdentifierLoc()); 5135 if (FTI.TypeQuals & Qualifiers::Volatile) 5136 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5137 << "volatile" << SourceRange(D.getIdentifierLoc()); 5138 if (FTI.TypeQuals & Qualifiers::Restrict) 5139 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5140 << "restrict" << SourceRange(D.getIdentifierLoc()); 5141 D.setInvalidType(); 5142 } 5143 5144 // C++0x [class.dtor]p2: 5145 // A destructor shall not be declared with a ref-qualifier. 5146 if (FTI.hasRefQualifier()) { 5147 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5148 << FTI.RefQualifierIsLValueRef 5149 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5150 D.setInvalidType(); 5151 } 5152 5153 // Make sure we don't have any parameters. 5154 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5155 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5156 5157 // Delete the parameters. 5158 FTI.freeArgs(); 5159 D.setInvalidType(); 5160 } 5161 5162 // Make sure the destructor isn't variadic. 5163 if (FTI.isVariadic) { 5164 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5165 D.setInvalidType(); 5166 } 5167 5168 // Rebuild the function type "R" without any type qualifiers or 5169 // parameters (in case any of the errors above fired) and with 5170 // "void" as the return type, since destructors don't have return 5171 // types. 5172 if (!D.isInvalidType()) 5173 return R; 5174 5175 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5176 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5177 EPI.Variadic = false; 5178 EPI.TypeQuals = 0; 5179 EPI.RefQualifier = RQ_None; 5180 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5181} 5182 5183/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5184/// well-formednes of the conversion function declarator @p D with 5185/// type @p R. If there are any errors in the declarator, this routine 5186/// will emit diagnostics and return true. Otherwise, it will return 5187/// false. Either way, the type @p R will be updated to reflect a 5188/// well-formed type for the conversion operator. 5189void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5190 StorageClass& SC) { 5191 // C++ [class.conv.fct]p1: 5192 // Neither parameter types nor return type can be specified. The 5193 // type of a conversion function (8.3.5) is "function taking no 5194 // parameter returning conversion-type-id." 5195 if (SC == SC_Static) { 5196 if (!D.isInvalidType()) 5197 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5198 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5199 << SourceRange(D.getIdentifierLoc()); 5200 D.setInvalidType(); 5201 SC = SC_None; 5202 } 5203 5204 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5205 5206 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5207 // Conversion functions don't have return types, but the parser will 5208 // happily parse something like: 5209 // 5210 // class X { 5211 // float operator bool(); 5212 // }; 5213 // 5214 // The return type will be changed later anyway. 5215 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5216 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5217 << SourceRange(D.getIdentifierLoc()); 5218 D.setInvalidType(); 5219 } 5220 5221 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5222 5223 // Make sure we don't have any parameters. 5224 if (Proto->getNumArgs() > 0) { 5225 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5226 5227 // Delete the parameters. 5228 D.getFunctionTypeInfo().freeArgs(); 5229 D.setInvalidType(); 5230 } else if (Proto->isVariadic()) { 5231 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5232 D.setInvalidType(); 5233 } 5234 5235 // Diagnose "&operator bool()" and other such nonsense. This 5236 // is actually a gcc extension which we don't support. 5237 if (Proto->getResultType() != ConvType) { 5238 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5239 << Proto->getResultType(); 5240 D.setInvalidType(); 5241 ConvType = Proto->getResultType(); 5242 } 5243 5244 // C++ [class.conv.fct]p4: 5245 // The conversion-type-id shall not represent a function type nor 5246 // an array type. 5247 if (ConvType->isArrayType()) { 5248 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5249 ConvType = Context.getPointerType(ConvType); 5250 D.setInvalidType(); 5251 } else if (ConvType->isFunctionType()) { 5252 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5253 ConvType = Context.getPointerType(ConvType); 5254 D.setInvalidType(); 5255 } 5256 5257 // Rebuild the function type "R" without any parameters (in case any 5258 // of the errors above fired) and with the conversion type as the 5259 // return type. 5260 if (D.isInvalidType()) 5261 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5262 5263 // C++0x explicit conversion operators. 5264 if (D.getDeclSpec().isExplicitSpecified()) 5265 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5266 getLangOpts().CPlusPlus0x ? 5267 diag::warn_cxx98_compat_explicit_conversion_functions : 5268 diag::ext_explicit_conversion_functions) 5269 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5270} 5271 5272/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5273/// the declaration of the given C++ conversion function. This routine 5274/// is responsible for recording the conversion function in the C++ 5275/// class, if possible. 5276Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5277 assert(Conversion && "Expected to receive a conversion function declaration"); 5278 5279 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5280 5281 // Make sure we aren't redeclaring the conversion function. 5282 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5283 5284 // C++ [class.conv.fct]p1: 5285 // [...] A conversion function is never used to convert a 5286 // (possibly cv-qualified) object to the (possibly cv-qualified) 5287 // same object type (or a reference to it), to a (possibly 5288 // cv-qualified) base class of that type (or a reference to it), 5289 // or to (possibly cv-qualified) void. 5290 // FIXME: Suppress this warning if the conversion function ends up being a 5291 // virtual function that overrides a virtual function in a base class. 5292 QualType ClassType 5293 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5294 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5295 ConvType = ConvTypeRef->getPointeeType(); 5296 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5297 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5298 /* Suppress diagnostics for instantiations. */; 5299 else if (ConvType->isRecordType()) { 5300 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5301 if (ConvType == ClassType) 5302 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5303 << ClassType; 5304 else if (IsDerivedFrom(ClassType, ConvType)) 5305 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5306 << ClassType << ConvType; 5307 } else if (ConvType->isVoidType()) { 5308 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5309 << ClassType << ConvType; 5310 } 5311 5312 if (FunctionTemplateDecl *ConversionTemplate 5313 = Conversion->getDescribedFunctionTemplate()) 5314 return ConversionTemplate; 5315 5316 return Conversion; 5317} 5318 5319//===----------------------------------------------------------------------===// 5320// Namespace Handling 5321//===----------------------------------------------------------------------===// 5322 5323 5324 5325/// ActOnStartNamespaceDef - This is called at the start of a namespace 5326/// definition. 5327Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5328 SourceLocation InlineLoc, 5329 SourceLocation NamespaceLoc, 5330 SourceLocation IdentLoc, 5331 IdentifierInfo *II, 5332 SourceLocation LBrace, 5333 AttributeList *AttrList) { 5334 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5335 // For anonymous namespace, take the location of the left brace. 5336 SourceLocation Loc = II ? IdentLoc : LBrace; 5337 bool IsInline = InlineLoc.isValid(); 5338 bool IsInvalid = false; 5339 bool IsStd = false; 5340 bool AddToKnown = false; 5341 Scope *DeclRegionScope = NamespcScope->getParent(); 5342 5343 NamespaceDecl *PrevNS = 0; 5344 if (II) { 5345 // C++ [namespace.def]p2: 5346 // The identifier in an original-namespace-definition shall not 5347 // have been previously defined in the declarative region in 5348 // which the original-namespace-definition appears. The 5349 // identifier in an original-namespace-definition is the name of 5350 // the namespace. Subsequently in that declarative region, it is 5351 // treated as an original-namespace-name. 5352 // 5353 // Since namespace names are unique in their scope, and we don't 5354 // look through using directives, just look for any ordinary names. 5355 5356 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5357 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5358 Decl::IDNS_Namespace; 5359 NamedDecl *PrevDecl = 0; 5360 for (DeclContext::lookup_result R 5361 = CurContext->getRedeclContext()->lookup(II); 5362 R.first != R.second; ++R.first) { 5363 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5364 PrevDecl = *R.first; 5365 break; 5366 } 5367 } 5368 5369 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5370 5371 if (PrevNS) { 5372 // This is an extended namespace definition. 5373 if (IsInline != PrevNS->isInline()) { 5374 // inline-ness must match 5375 if (PrevNS->isInline()) { 5376 // The user probably just forgot the 'inline', so suggest that it 5377 // be added back. 5378 Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5379 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5380 } else { 5381 Diag(Loc, diag::err_inline_namespace_mismatch) 5382 << IsInline; 5383 } 5384 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5385 5386 IsInline = PrevNS->isInline(); 5387 } 5388 } else if (PrevDecl) { 5389 // This is an invalid name redefinition. 5390 Diag(Loc, diag::err_redefinition_different_kind) 5391 << II; 5392 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5393 IsInvalid = true; 5394 // Continue on to push Namespc as current DeclContext and return it. 5395 } else if (II->isStr("std") && 5396 CurContext->getRedeclContext()->isTranslationUnit()) { 5397 // This is the first "real" definition of the namespace "std", so update 5398 // our cache of the "std" namespace to point at this definition. 5399 PrevNS = getStdNamespace(); 5400 IsStd = true; 5401 AddToKnown = !IsInline; 5402 } else { 5403 // We've seen this namespace for the first time. 5404 AddToKnown = !IsInline; 5405 } 5406 } else { 5407 // Anonymous namespaces. 5408 5409 // Determine whether the parent already has an anonymous namespace. 5410 DeclContext *Parent = CurContext->getRedeclContext(); 5411 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5412 PrevNS = TU->getAnonymousNamespace(); 5413 } else { 5414 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5415 PrevNS = ND->getAnonymousNamespace(); 5416 } 5417 5418 if (PrevNS && IsInline != PrevNS->isInline()) { 5419 // inline-ness must match 5420 Diag(Loc, diag::err_inline_namespace_mismatch) 5421 << IsInline; 5422 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5423 5424 // Recover by ignoring the new namespace's inline status. 5425 IsInline = PrevNS->isInline(); 5426 } 5427 } 5428 5429 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5430 StartLoc, Loc, II, PrevNS); 5431 if (IsInvalid) 5432 Namespc->setInvalidDecl(); 5433 5434 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5435 5436 // FIXME: Should we be merging attributes? 5437 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5438 PushNamespaceVisibilityAttr(Attr, Loc); 5439 5440 if (IsStd) 5441 StdNamespace = Namespc; 5442 if (AddToKnown) 5443 KnownNamespaces[Namespc] = false; 5444 5445 if (II) { 5446 PushOnScopeChains(Namespc, DeclRegionScope); 5447 } else { 5448 // Link the anonymous namespace into its parent. 5449 DeclContext *Parent = CurContext->getRedeclContext(); 5450 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5451 TU->setAnonymousNamespace(Namespc); 5452 } else { 5453 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5454 } 5455 5456 CurContext->addDecl(Namespc); 5457 5458 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5459 // behaves as if it were replaced by 5460 // namespace unique { /* empty body */ } 5461 // using namespace unique; 5462 // namespace unique { namespace-body } 5463 // where all occurrences of 'unique' in a translation unit are 5464 // replaced by the same identifier and this identifier differs 5465 // from all other identifiers in the entire program. 5466 5467 // We just create the namespace with an empty name and then add an 5468 // implicit using declaration, just like the standard suggests. 5469 // 5470 // CodeGen enforces the "universally unique" aspect by giving all 5471 // declarations semantically contained within an anonymous 5472 // namespace internal linkage. 5473 5474 if (!PrevNS) { 5475 UsingDirectiveDecl* UD 5476 = UsingDirectiveDecl::Create(Context, CurContext, 5477 /* 'using' */ LBrace, 5478 /* 'namespace' */ SourceLocation(), 5479 /* qualifier */ NestedNameSpecifierLoc(), 5480 /* identifier */ SourceLocation(), 5481 Namespc, 5482 /* Ancestor */ CurContext); 5483 UD->setImplicit(); 5484 CurContext->addDecl(UD); 5485 } 5486 } 5487 5488 ActOnDocumentableDecl(Namespc); 5489 5490 // Although we could have an invalid decl (i.e. the namespace name is a 5491 // redefinition), push it as current DeclContext and try to continue parsing. 5492 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5493 // for the namespace has the declarations that showed up in that particular 5494 // namespace definition. 5495 PushDeclContext(NamespcScope, Namespc); 5496 return Namespc; 5497} 5498 5499/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5500/// is a namespace alias, returns the namespace it points to. 5501static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5502 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5503 return AD->getNamespace(); 5504 return dyn_cast_or_null<NamespaceDecl>(D); 5505} 5506 5507/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5508/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5509void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5510 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5511 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5512 Namespc->setRBraceLoc(RBrace); 5513 PopDeclContext(); 5514 if (Namespc->hasAttr<VisibilityAttr>()) 5515 PopPragmaVisibility(true, RBrace); 5516} 5517 5518CXXRecordDecl *Sema::getStdBadAlloc() const { 5519 return cast_or_null<CXXRecordDecl>( 5520 StdBadAlloc.get(Context.getExternalSource())); 5521} 5522 5523NamespaceDecl *Sema::getStdNamespace() const { 5524 return cast_or_null<NamespaceDecl>( 5525 StdNamespace.get(Context.getExternalSource())); 5526} 5527 5528/// \brief Retrieve the special "std" namespace, which may require us to 5529/// implicitly define the namespace. 5530NamespaceDecl *Sema::getOrCreateStdNamespace() { 5531 if (!StdNamespace) { 5532 // The "std" namespace has not yet been defined, so build one implicitly. 5533 StdNamespace = NamespaceDecl::Create(Context, 5534 Context.getTranslationUnitDecl(), 5535 /*Inline=*/false, 5536 SourceLocation(), SourceLocation(), 5537 &PP.getIdentifierTable().get("std"), 5538 /*PrevDecl=*/0); 5539 getStdNamespace()->setImplicit(true); 5540 } 5541 5542 return getStdNamespace(); 5543} 5544 5545bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 5546 assert(getLangOpts().CPlusPlus && 5547 "Looking for std::initializer_list outside of C++."); 5548 5549 // We're looking for implicit instantiations of 5550 // template <typename E> class std::initializer_list. 5551 5552 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 5553 return false; 5554 5555 ClassTemplateDecl *Template = 0; 5556 const TemplateArgument *Arguments = 0; 5557 5558 if (const RecordType *RT = Ty->getAs<RecordType>()) { 5559 5560 ClassTemplateSpecializationDecl *Specialization = 5561 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 5562 if (!Specialization) 5563 return false; 5564 5565 Template = Specialization->getSpecializedTemplate(); 5566 Arguments = Specialization->getTemplateArgs().data(); 5567 } else if (const TemplateSpecializationType *TST = 5568 Ty->getAs<TemplateSpecializationType>()) { 5569 Template = dyn_cast_or_null<ClassTemplateDecl>( 5570 TST->getTemplateName().getAsTemplateDecl()); 5571 Arguments = TST->getArgs(); 5572 } 5573 if (!Template) 5574 return false; 5575 5576 if (!StdInitializerList) { 5577 // Haven't recognized std::initializer_list yet, maybe this is it. 5578 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 5579 if (TemplateClass->getIdentifier() != 5580 &PP.getIdentifierTable().get("initializer_list") || 5581 !getStdNamespace()->InEnclosingNamespaceSetOf( 5582 TemplateClass->getDeclContext())) 5583 return false; 5584 // This is a template called std::initializer_list, but is it the right 5585 // template? 5586 TemplateParameterList *Params = Template->getTemplateParameters(); 5587 if (Params->getMinRequiredArguments() != 1) 5588 return false; 5589 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 5590 return false; 5591 5592 // It's the right template. 5593 StdInitializerList = Template; 5594 } 5595 5596 if (Template != StdInitializerList) 5597 return false; 5598 5599 // This is an instance of std::initializer_list. Find the argument type. 5600 if (Element) 5601 *Element = Arguments[0].getAsType(); 5602 return true; 5603} 5604 5605static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 5606 NamespaceDecl *Std = S.getStdNamespace(); 5607 if (!Std) { 5608 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5609 return 0; 5610 } 5611 5612 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 5613 Loc, Sema::LookupOrdinaryName); 5614 if (!S.LookupQualifiedName(Result, Std)) { 5615 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5616 return 0; 5617 } 5618 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 5619 if (!Template) { 5620 Result.suppressDiagnostics(); 5621 // We found something weird. Complain about the first thing we found. 5622 NamedDecl *Found = *Result.begin(); 5623 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 5624 return 0; 5625 } 5626 5627 // We found some template called std::initializer_list. Now verify that it's 5628 // correct. 5629 TemplateParameterList *Params = Template->getTemplateParameters(); 5630 if (Params->getMinRequiredArguments() != 1 || 5631 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 5632 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 5633 return 0; 5634 } 5635 5636 return Template; 5637} 5638 5639QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 5640 if (!StdInitializerList) { 5641 StdInitializerList = LookupStdInitializerList(*this, Loc); 5642 if (!StdInitializerList) 5643 return QualType(); 5644 } 5645 5646 TemplateArgumentListInfo Args(Loc, Loc); 5647 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 5648 Context.getTrivialTypeSourceInfo(Element, 5649 Loc))); 5650 return Context.getCanonicalType( 5651 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 5652} 5653 5654bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 5655 // C++ [dcl.init.list]p2: 5656 // A constructor is an initializer-list constructor if its first parameter 5657 // is of type std::initializer_list<E> or reference to possibly cv-qualified 5658 // std::initializer_list<E> for some type E, and either there are no other 5659 // parameters or else all other parameters have default arguments. 5660 if (Ctor->getNumParams() < 1 || 5661 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 5662 return false; 5663 5664 QualType ArgType = Ctor->getParamDecl(0)->getType(); 5665 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 5666 ArgType = RT->getPointeeType().getUnqualifiedType(); 5667 5668 return isStdInitializerList(ArgType, 0); 5669} 5670 5671/// \brief Determine whether a using statement is in a context where it will be 5672/// apply in all contexts. 5673static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5674 switch (CurContext->getDeclKind()) { 5675 case Decl::TranslationUnit: 5676 return true; 5677 case Decl::LinkageSpec: 5678 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5679 default: 5680 return false; 5681 } 5682} 5683 5684namespace { 5685 5686// Callback to only accept typo corrections that are namespaces. 5687class NamespaceValidatorCCC : public CorrectionCandidateCallback { 5688 public: 5689 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5690 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 5691 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 5692 } 5693 return false; 5694 } 5695}; 5696 5697} 5698 5699static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5700 CXXScopeSpec &SS, 5701 SourceLocation IdentLoc, 5702 IdentifierInfo *Ident) { 5703 NamespaceValidatorCCC Validator; 5704 R.clear(); 5705 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5706 R.getLookupKind(), Sc, &SS, 5707 Validator)) { 5708 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 5709 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOpts())); 5710 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5711 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5712 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5713 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5714 else 5715 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5716 << Ident << CorrectedQuotedStr 5717 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5718 5719 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5720 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5721 5722 R.addDecl(Corrected.getCorrectionDecl()); 5723 return true; 5724 } 5725 return false; 5726} 5727 5728Decl *Sema::ActOnUsingDirective(Scope *S, 5729 SourceLocation UsingLoc, 5730 SourceLocation NamespcLoc, 5731 CXXScopeSpec &SS, 5732 SourceLocation IdentLoc, 5733 IdentifierInfo *NamespcName, 5734 AttributeList *AttrList) { 5735 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5736 assert(NamespcName && "Invalid NamespcName."); 5737 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5738 5739 // This can only happen along a recovery path. 5740 while (S->getFlags() & Scope::TemplateParamScope) 5741 S = S->getParent(); 5742 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5743 5744 UsingDirectiveDecl *UDir = 0; 5745 NestedNameSpecifier *Qualifier = 0; 5746 if (SS.isSet()) 5747 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5748 5749 // Lookup namespace name. 5750 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5751 LookupParsedName(R, S, &SS); 5752 if (R.isAmbiguous()) 5753 return 0; 5754 5755 if (R.empty()) { 5756 R.clear(); 5757 // Allow "using namespace std;" or "using namespace ::std;" even if 5758 // "std" hasn't been defined yet, for GCC compatibility. 5759 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5760 NamespcName->isStr("std")) { 5761 Diag(IdentLoc, diag::ext_using_undefined_std); 5762 R.addDecl(getOrCreateStdNamespace()); 5763 R.resolveKind(); 5764 } 5765 // Otherwise, attempt typo correction. 5766 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5767 } 5768 5769 if (!R.empty()) { 5770 NamedDecl *Named = R.getFoundDecl(); 5771 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5772 && "expected namespace decl"); 5773 // C++ [namespace.udir]p1: 5774 // A using-directive specifies that the names in the nominated 5775 // namespace can be used in the scope in which the 5776 // using-directive appears after the using-directive. During 5777 // unqualified name lookup (3.4.1), the names appear as if they 5778 // were declared in the nearest enclosing namespace which 5779 // contains both the using-directive and the nominated 5780 // namespace. [Note: in this context, "contains" means "contains 5781 // directly or indirectly". ] 5782 5783 // Find enclosing context containing both using-directive and 5784 // nominated namespace. 5785 NamespaceDecl *NS = getNamespaceDecl(Named); 5786 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5787 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5788 CommonAncestor = CommonAncestor->getParent(); 5789 5790 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5791 SS.getWithLocInContext(Context), 5792 IdentLoc, Named, CommonAncestor); 5793 5794 if (IsUsingDirectiveInToplevelContext(CurContext) && 5795 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5796 Diag(IdentLoc, diag::warn_using_directive_in_header); 5797 } 5798 5799 PushUsingDirective(S, UDir); 5800 } else { 5801 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5802 } 5803 5804 // FIXME: We ignore attributes for now. 5805 return UDir; 5806} 5807 5808void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5809 // If the scope has an associated entity and the using directive is at 5810 // namespace or translation unit scope, add the UsingDirectiveDecl into 5811 // its lookup structure so qualified name lookup can find it. 5812 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()); 5813 if (Ctx && !Ctx->isFunctionOrMethod()) 5814 Ctx->addDecl(UDir); 5815 else 5816 // Otherwise, it is at block sope. The using-directives will affect lookup 5817 // only to the end of the scope. 5818 S->PushUsingDirective(UDir); 5819} 5820 5821 5822Decl *Sema::ActOnUsingDeclaration(Scope *S, 5823 AccessSpecifier AS, 5824 bool HasUsingKeyword, 5825 SourceLocation UsingLoc, 5826 CXXScopeSpec &SS, 5827 UnqualifiedId &Name, 5828 AttributeList *AttrList, 5829 bool IsTypeName, 5830 SourceLocation TypenameLoc) { 5831 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5832 5833 switch (Name.getKind()) { 5834 case UnqualifiedId::IK_ImplicitSelfParam: 5835 case UnqualifiedId::IK_Identifier: 5836 case UnqualifiedId::IK_OperatorFunctionId: 5837 case UnqualifiedId::IK_LiteralOperatorId: 5838 case UnqualifiedId::IK_ConversionFunctionId: 5839 break; 5840 5841 case UnqualifiedId::IK_ConstructorName: 5842 case UnqualifiedId::IK_ConstructorTemplateId: 5843 // C++11 inheriting constructors. 5844 Diag(Name.getLocStart(), 5845 getLangOpts().CPlusPlus0x ? 5846 // FIXME: Produce warn_cxx98_compat_using_decl_constructor 5847 // instead once inheriting constructors work. 5848 diag::err_using_decl_constructor_unsupported : 5849 diag::err_using_decl_constructor) 5850 << SS.getRange(); 5851 5852 if (getLangOpts().CPlusPlus0x) break; 5853 5854 return 0; 5855 5856 case UnqualifiedId::IK_DestructorName: 5857 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 5858 << SS.getRange(); 5859 return 0; 5860 5861 case UnqualifiedId::IK_TemplateId: 5862 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 5863 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5864 return 0; 5865 } 5866 5867 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5868 DeclarationName TargetName = TargetNameInfo.getName(); 5869 if (!TargetName) 5870 return 0; 5871 5872 // Warn about using declarations. 5873 // TODO: store that the declaration was written without 'using' and 5874 // talk about access decls instead of using decls in the 5875 // diagnostics. 5876 if (!HasUsingKeyword) { 5877 UsingLoc = Name.getLocStart(); 5878 5879 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5880 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5881 } 5882 5883 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5884 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5885 return 0; 5886 5887 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5888 TargetNameInfo, AttrList, 5889 /* IsInstantiation */ false, 5890 IsTypeName, TypenameLoc); 5891 if (UD) 5892 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5893 5894 return UD; 5895} 5896 5897/// \brief Determine whether a using declaration considers the given 5898/// declarations as "equivalent", e.g., if they are redeclarations of 5899/// the same entity or are both typedefs of the same type. 5900static bool 5901IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5902 bool &SuppressRedeclaration) { 5903 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5904 SuppressRedeclaration = false; 5905 return true; 5906 } 5907 5908 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5909 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5910 SuppressRedeclaration = true; 5911 return Context.hasSameType(TD1->getUnderlyingType(), 5912 TD2->getUnderlyingType()); 5913 } 5914 5915 return false; 5916} 5917 5918 5919/// Determines whether to create a using shadow decl for a particular 5920/// decl, given the set of decls existing prior to this using lookup. 5921bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5922 const LookupResult &Previous) { 5923 // Diagnose finding a decl which is not from a base class of the 5924 // current class. We do this now because there are cases where this 5925 // function will silently decide not to build a shadow decl, which 5926 // will pre-empt further diagnostics. 5927 // 5928 // We don't need to do this in C++0x because we do the check once on 5929 // the qualifier. 5930 // 5931 // FIXME: diagnose the following if we care enough: 5932 // struct A { int foo; }; 5933 // struct B : A { using A::foo; }; 5934 // template <class T> struct C : A {}; 5935 // template <class T> struct D : C<T> { using B::foo; } // <--- 5936 // This is invalid (during instantiation) in C++03 because B::foo 5937 // resolves to the using decl in B, which is not a base class of D<T>. 5938 // We can't diagnose it immediately because C<T> is an unknown 5939 // specialization. The UsingShadowDecl in D<T> then points directly 5940 // to A::foo, which will look well-formed when we instantiate. 5941 // The right solution is to not collapse the shadow-decl chain. 5942 if (!getLangOpts().CPlusPlus0x && CurContext->isRecord()) { 5943 DeclContext *OrigDC = Orig->getDeclContext(); 5944 5945 // Handle enums and anonymous structs. 5946 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5947 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5948 while (OrigRec->isAnonymousStructOrUnion()) 5949 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5950 5951 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5952 if (OrigDC == CurContext) { 5953 Diag(Using->getLocation(), 5954 diag::err_using_decl_nested_name_specifier_is_current_class) 5955 << Using->getQualifierLoc().getSourceRange(); 5956 Diag(Orig->getLocation(), diag::note_using_decl_target); 5957 return true; 5958 } 5959 5960 Diag(Using->getQualifierLoc().getBeginLoc(), 5961 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5962 << Using->getQualifier() 5963 << cast<CXXRecordDecl>(CurContext) 5964 << Using->getQualifierLoc().getSourceRange(); 5965 Diag(Orig->getLocation(), diag::note_using_decl_target); 5966 return true; 5967 } 5968 } 5969 5970 if (Previous.empty()) return false; 5971 5972 NamedDecl *Target = Orig; 5973 if (isa<UsingShadowDecl>(Target)) 5974 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5975 5976 // If the target happens to be one of the previous declarations, we 5977 // don't have a conflict. 5978 // 5979 // FIXME: but we might be increasing its access, in which case we 5980 // should redeclare it. 5981 NamedDecl *NonTag = 0, *Tag = 0; 5982 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5983 I != E; ++I) { 5984 NamedDecl *D = (*I)->getUnderlyingDecl(); 5985 bool Result; 5986 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5987 return Result; 5988 5989 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5990 } 5991 5992 if (Target->isFunctionOrFunctionTemplate()) { 5993 FunctionDecl *FD; 5994 if (isa<FunctionTemplateDecl>(Target)) 5995 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5996 else 5997 FD = cast<FunctionDecl>(Target); 5998 5999 NamedDecl *OldDecl = 0; 6000 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6001 case Ovl_Overload: 6002 return false; 6003 6004 case Ovl_NonFunction: 6005 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6006 break; 6007 6008 // We found a decl with the exact signature. 6009 case Ovl_Match: 6010 // If we're in a record, we want to hide the target, so we 6011 // return true (without a diagnostic) to tell the caller not to 6012 // build a shadow decl. 6013 if (CurContext->isRecord()) 6014 return true; 6015 6016 // If we're not in a record, this is an error. 6017 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6018 break; 6019 } 6020 6021 Diag(Target->getLocation(), diag::note_using_decl_target); 6022 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6023 return true; 6024 } 6025 6026 // Target is not a function. 6027 6028 if (isa<TagDecl>(Target)) { 6029 // No conflict between a tag and a non-tag. 6030 if (!Tag) return false; 6031 6032 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6033 Diag(Target->getLocation(), diag::note_using_decl_target); 6034 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6035 return true; 6036 } 6037 6038 // No conflict between a tag and a non-tag. 6039 if (!NonTag) return false; 6040 6041 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6042 Diag(Target->getLocation(), diag::note_using_decl_target); 6043 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6044 return true; 6045} 6046 6047/// Builds a shadow declaration corresponding to a 'using' declaration. 6048UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6049 UsingDecl *UD, 6050 NamedDecl *Orig) { 6051 6052 // If we resolved to another shadow declaration, just coalesce them. 6053 NamedDecl *Target = Orig; 6054 if (isa<UsingShadowDecl>(Target)) { 6055 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6056 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6057 } 6058 6059 UsingShadowDecl *Shadow 6060 = UsingShadowDecl::Create(Context, CurContext, 6061 UD->getLocation(), UD, Target); 6062 UD->addShadowDecl(Shadow); 6063 6064 Shadow->setAccess(UD->getAccess()); 6065 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6066 Shadow->setInvalidDecl(); 6067 6068 if (S) 6069 PushOnScopeChains(Shadow, S); 6070 else 6071 CurContext->addDecl(Shadow); 6072 6073 6074 return Shadow; 6075} 6076 6077/// Hides a using shadow declaration. This is required by the current 6078/// using-decl implementation when a resolvable using declaration in a 6079/// class is followed by a declaration which would hide or override 6080/// one or more of the using decl's targets; for example: 6081/// 6082/// struct Base { void foo(int); }; 6083/// struct Derived : Base { 6084/// using Base::foo; 6085/// void foo(int); 6086/// }; 6087/// 6088/// The governing language is C++03 [namespace.udecl]p12: 6089/// 6090/// When a using-declaration brings names from a base class into a 6091/// derived class scope, member functions in the derived class 6092/// override and/or hide member functions with the same name and 6093/// parameter types in a base class (rather than conflicting). 6094/// 6095/// There are two ways to implement this: 6096/// (1) optimistically create shadow decls when they're not hidden 6097/// by existing declarations, or 6098/// (2) don't create any shadow decls (or at least don't make them 6099/// visible) until we've fully parsed/instantiated the class. 6100/// The problem with (1) is that we might have to retroactively remove 6101/// a shadow decl, which requires several O(n) operations because the 6102/// decl structures are (very reasonably) not designed for removal. 6103/// (2) avoids this but is very fiddly and phase-dependent. 6104void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6105 if (Shadow->getDeclName().getNameKind() == 6106 DeclarationName::CXXConversionFunctionName) 6107 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6108 6109 // Remove it from the DeclContext... 6110 Shadow->getDeclContext()->removeDecl(Shadow); 6111 6112 // ...and the scope, if applicable... 6113 if (S) { 6114 S->RemoveDecl(Shadow); 6115 IdResolver.RemoveDecl(Shadow); 6116 } 6117 6118 // ...and the using decl. 6119 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6120 6121 // TODO: complain somehow if Shadow was used. It shouldn't 6122 // be possible for this to happen, because...? 6123} 6124 6125/// Builds a using declaration. 6126/// 6127/// \param IsInstantiation - Whether this call arises from an 6128/// instantiation of an unresolved using declaration. We treat 6129/// the lookup differently for these declarations. 6130NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6131 SourceLocation UsingLoc, 6132 CXXScopeSpec &SS, 6133 const DeclarationNameInfo &NameInfo, 6134 AttributeList *AttrList, 6135 bool IsInstantiation, 6136 bool IsTypeName, 6137 SourceLocation TypenameLoc) { 6138 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6139 SourceLocation IdentLoc = NameInfo.getLoc(); 6140 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6141 6142 // FIXME: We ignore attributes for now. 6143 6144 if (SS.isEmpty()) { 6145 Diag(IdentLoc, diag::err_using_requires_qualname); 6146 return 0; 6147 } 6148 6149 // Do the redeclaration lookup in the current scope. 6150 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6151 ForRedeclaration); 6152 Previous.setHideTags(false); 6153 if (S) { 6154 LookupName(Previous, S); 6155 6156 // It is really dumb that we have to do this. 6157 LookupResult::Filter F = Previous.makeFilter(); 6158 while (F.hasNext()) { 6159 NamedDecl *D = F.next(); 6160 if (!isDeclInScope(D, CurContext, S)) 6161 F.erase(); 6162 } 6163 F.done(); 6164 } else { 6165 assert(IsInstantiation && "no scope in non-instantiation"); 6166 assert(CurContext->isRecord() && "scope not record in instantiation"); 6167 LookupQualifiedName(Previous, CurContext); 6168 } 6169 6170 // Check for invalid redeclarations. 6171 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6172 return 0; 6173 6174 // Check for bad qualifiers. 6175 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6176 return 0; 6177 6178 DeclContext *LookupContext = computeDeclContext(SS); 6179 NamedDecl *D; 6180 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6181 if (!LookupContext) { 6182 if (IsTypeName) { 6183 // FIXME: not all declaration name kinds are legal here 6184 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6185 UsingLoc, TypenameLoc, 6186 QualifierLoc, 6187 IdentLoc, NameInfo.getName()); 6188 } else { 6189 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6190 QualifierLoc, NameInfo); 6191 } 6192 } else { 6193 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6194 NameInfo, IsTypeName); 6195 } 6196 D->setAccess(AS); 6197 CurContext->addDecl(D); 6198 6199 if (!LookupContext) return D; 6200 UsingDecl *UD = cast<UsingDecl>(D); 6201 6202 if (RequireCompleteDeclContext(SS, LookupContext)) { 6203 UD->setInvalidDecl(); 6204 return UD; 6205 } 6206 6207 // The normal rules do not apply to inheriting constructor declarations. 6208 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6209 if (CheckInheritingConstructorUsingDecl(UD)) 6210 UD->setInvalidDecl(); 6211 return UD; 6212 } 6213 6214 // Otherwise, look up the target name. 6215 6216 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6217 6218 // Unlike most lookups, we don't always want to hide tag 6219 // declarations: tag names are visible through the using declaration 6220 // even if hidden by ordinary names, *except* in a dependent context 6221 // where it's important for the sanity of two-phase lookup. 6222 if (!IsInstantiation) 6223 R.setHideTags(false); 6224 6225 // For the purposes of this lookup, we have a base object type 6226 // equal to that of the current context. 6227 if (CurContext->isRecord()) { 6228 R.setBaseObjectType( 6229 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); 6230 } 6231 6232 LookupQualifiedName(R, LookupContext); 6233 6234 if (R.empty()) { 6235 Diag(IdentLoc, diag::err_no_member) 6236 << NameInfo.getName() << LookupContext << SS.getRange(); 6237 UD->setInvalidDecl(); 6238 return UD; 6239 } 6240 6241 if (R.isAmbiguous()) { 6242 UD->setInvalidDecl(); 6243 return UD; 6244 } 6245 6246 if (IsTypeName) { 6247 // If we asked for a typename and got a non-type decl, error out. 6248 if (!R.getAsSingle<TypeDecl>()) { 6249 Diag(IdentLoc, diag::err_using_typename_non_type); 6250 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6251 Diag((*I)->getUnderlyingDecl()->getLocation(), 6252 diag::note_using_decl_target); 6253 UD->setInvalidDecl(); 6254 return UD; 6255 } 6256 } else { 6257 // If we asked for a non-typename and we got a type, error out, 6258 // but only if this is an instantiation of an unresolved using 6259 // decl. Otherwise just silently find the type name. 6260 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6261 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6262 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6263 UD->setInvalidDecl(); 6264 return UD; 6265 } 6266 } 6267 6268 // C++0x N2914 [namespace.udecl]p6: 6269 // A using-declaration shall not name a namespace. 6270 if (R.getAsSingle<NamespaceDecl>()) { 6271 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6272 << SS.getRange(); 6273 UD->setInvalidDecl(); 6274 return UD; 6275 } 6276 6277 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6278 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6279 BuildUsingShadowDecl(S, UD, *I); 6280 } 6281 6282 return UD; 6283} 6284 6285/// Additional checks for a using declaration referring to a constructor name. 6286bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { 6287 assert(!UD->isTypeName() && "expecting a constructor name"); 6288 6289 const Type *SourceType = UD->getQualifier()->getAsType(); 6290 assert(SourceType && 6291 "Using decl naming constructor doesn't have type in scope spec."); 6292 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6293 6294 // Check whether the named type is a direct base class. 6295 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6296 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6297 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6298 BaseIt != BaseE; ++BaseIt) { 6299 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6300 if (CanonicalSourceType == BaseType) 6301 break; 6302 if (BaseIt->getType()->isDependentType()) 6303 break; 6304 } 6305 6306 if (BaseIt == BaseE) { 6307 // Did not find SourceType in the bases. 6308 Diag(UD->getUsingLocation(), 6309 diag::err_using_decl_constructor_not_in_direct_base) 6310 << UD->getNameInfo().getSourceRange() 6311 << QualType(SourceType, 0) << TargetClass; 6312 return true; 6313 } 6314 6315 if (!CurContext->isDependentContext()) 6316 BaseIt->setInheritConstructors(); 6317 6318 return false; 6319} 6320 6321/// Checks that the given using declaration is not an invalid 6322/// redeclaration. Note that this is checking only for the using decl 6323/// itself, not for any ill-formedness among the UsingShadowDecls. 6324bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6325 bool isTypeName, 6326 const CXXScopeSpec &SS, 6327 SourceLocation NameLoc, 6328 const LookupResult &Prev) { 6329 // C++03 [namespace.udecl]p8: 6330 // C++0x [namespace.udecl]p10: 6331 // A using-declaration is a declaration and can therefore be used 6332 // repeatedly where (and only where) multiple declarations are 6333 // allowed. 6334 // 6335 // That's in non-member contexts. 6336 if (!CurContext->getRedeclContext()->isRecord()) 6337 return false; 6338 6339 NestedNameSpecifier *Qual 6340 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6341 6342 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6343 NamedDecl *D = *I; 6344 6345 bool DTypename; 6346 NestedNameSpecifier *DQual; 6347 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6348 DTypename = UD->isTypeName(); 6349 DQual = UD->getQualifier(); 6350 } else if (UnresolvedUsingValueDecl *UD 6351 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6352 DTypename = false; 6353 DQual = UD->getQualifier(); 6354 } else if (UnresolvedUsingTypenameDecl *UD 6355 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6356 DTypename = true; 6357 DQual = UD->getQualifier(); 6358 } else continue; 6359 6360 // using decls differ if one says 'typename' and the other doesn't. 6361 // FIXME: non-dependent using decls? 6362 if (isTypeName != DTypename) continue; 6363 6364 // using decls differ if they name different scopes (but note that 6365 // template instantiation can cause this check to trigger when it 6366 // didn't before instantiation). 6367 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6368 Context.getCanonicalNestedNameSpecifier(DQual)) 6369 continue; 6370 6371 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6372 Diag(D->getLocation(), diag::note_using_decl) << 1; 6373 return true; 6374 } 6375 6376 return false; 6377} 6378 6379 6380/// Checks that the given nested-name qualifier used in a using decl 6381/// in the current context is appropriately related to the current 6382/// scope. If an error is found, diagnoses it and returns true. 6383bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6384 const CXXScopeSpec &SS, 6385 SourceLocation NameLoc) { 6386 DeclContext *NamedContext = computeDeclContext(SS); 6387 6388 if (!CurContext->isRecord()) { 6389 // C++03 [namespace.udecl]p3: 6390 // C++0x [namespace.udecl]p8: 6391 // A using-declaration for a class member shall be a member-declaration. 6392 6393 // If we weren't able to compute a valid scope, it must be a 6394 // dependent class scope. 6395 if (!NamedContext || NamedContext->isRecord()) { 6396 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6397 << SS.getRange(); 6398 return true; 6399 } 6400 6401 // Otherwise, everything is known to be fine. 6402 return false; 6403 } 6404 6405 // The current scope is a record. 6406 6407 // If the named context is dependent, we can't decide much. 6408 if (!NamedContext) { 6409 // FIXME: in C++0x, we can diagnose if we can prove that the 6410 // nested-name-specifier does not refer to a base class, which is 6411 // still possible in some cases. 6412 6413 // Otherwise we have to conservatively report that things might be 6414 // okay. 6415 return false; 6416 } 6417 6418 if (!NamedContext->isRecord()) { 6419 // Ideally this would point at the last name in the specifier, 6420 // but we don't have that level of source info. 6421 Diag(SS.getRange().getBegin(), 6422 diag::err_using_decl_nested_name_specifier_is_not_class) 6423 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6424 return true; 6425 } 6426 6427 if (!NamedContext->isDependentContext() && 6428 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6429 return true; 6430 6431 if (getLangOpts().CPlusPlus0x) { 6432 // C++0x [namespace.udecl]p3: 6433 // In a using-declaration used as a member-declaration, the 6434 // nested-name-specifier shall name a base class of the class 6435 // being defined. 6436 6437 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6438 cast<CXXRecordDecl>(NamedContext))) { 6439 if (CurContext == NamedContext) { 6440 Diag(NameLoc, 6441 diag::err_using_decl_nested_name_specifier_is_current_class) 6442 << SS.getRange(); 6443 return true; 6444 } 6445 6446 Diag(SS.getRange().getBegin(), 6447 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6448 << (NestedNameSpecifier*) SS.getScopeRep() 6449 << cast<CXXRecordDecl>(CurContext) 6450 << SS.getRange(); 6451 return true; 6452 } 6453 6454 return false; 6455 } 6456 6457 // C++03 [namespace.udecl]p4: 6458 // A using-declaration used as a member-declaration shall refer 6459 // to a member of a base class of the class being defined [etc.]. 6460 6461 // Salient point: SS doesn't have to name a base class as long as 6462 // lookup only finds members from base classes. Therefore we can 6463 // diagnose here only if we can prove that that can't happen, 6464 // i.e. if the class hierarchies provably don't intersect. 6465 6466 // TODO: it would be nice if "definitely valid" results were cached 6467 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6468 // need to be repeated. 6469 6470 struct UserData { 6471 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 6472 6473 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6474 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6475 Data->Bases.insert(Base); 6476 return true; 6477 } 6478 6479 bool hasDependentBases(const CXXRecordDecl *Class) { 6480 return !Class->forallBases(collect, this); 6481 } 6482 6483 /// Returns true if the base is dependent or is one of the 6484 /// accumulated base classes. 6485 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6486 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6487 return !Data->Bases.count(Base); 6488 } 6489 6490 bool mightShareBases(const CXXRecordDecl *Class) { 6491 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6492 } 6493 }; 6494 6495 UserData Data; 6496 6497 // Returns false if we find a dependent base. 6498 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6499 return false; 6500 6501 // Returns false if the class has a dependent base or if it or one 6502 // of its bases is present in the base set of the current context. 6503 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6504 return false; 6505 6506 Diag(SS.getRange().getBegin(), 6507 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6508 << (NestedNameSpecifier*) SS.getScopeRep() 6509 << cast<CXXRecordDecl>(CurContext) 6510 << SS.getRange(); 6511 6512 return true; 6513} 6514 6515Decl *Sema::ActOnAliasDeclaration(Scope *S, 6516 AccessSpecifier AS, 6517 MultiTemplateParamsArg TemplateParamLists, 6518 SourceLocation UsingLoc, 6519 UnqualifiedId &Name, 6520 TypeResult Type) { 6521 // Skip up to the relevant declaration scope. 6522 while (S->getFlags() & Scope::TemplateParamScope) 6523 S = S->getParent(); 6524 assert((S->getFlags() & Scope::DeclScope) && 6525 "got alias-declaration outside of declaration scope"); 6526 6527 if (Type.isInvalid()) 6528 return 0; 6529 6530 bool Invalid = false; 6531 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6532 TypeSourceInfo *TInfo = 0; 6533 GetTypeFromParser(Type.get(), &TInfo); 6534 6535 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6536 return 0; 6537 6538 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6539 UPPC_DeclarationType)) { 6540 Invalid = true; 6541 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6542 TInfo->getTypeLoc().getBeginLoc()); 6543 } 6544 6545 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6546 LookupName(Previous, S); 6547 6548 // Warn about shadowing the name of a template parameter. 6549 if (Previous.isSingleResult() && 6550 Previous.getFoundDecl()->isTemplateParameter()) { 6551 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6552 Previous.clear(); 6553 } 6554 6555 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6556 "name in alias declaration must be an identifier"); 6557 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6558 Name.StartLocation, 6559 Name.Identifier, TInfo); 6560 6561 NewTD->setAccess(AS); 6562 6563 if (Invalid) 6564 NewTD->setInvalidDecl(); 6565 6566 CheckTypedefForVariablyModifiedType(S, NewTD); 6567 Invalid |= NewTD->isInvalidDecl(); 6568 6569 bool Redeclaration = false; 6570 6571 NamedDecl *NewND; 6572 if (TemplateParamLists.size()) { 6573 TypeAliasTemplateDecl *OldDecl = 0; 6574 TemplateParameterList *OldTemplateParams = 0; 6575 6576 if (TemplateParamLists.size() != 1) { 6577 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6578 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6579 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6580 } 6581 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6582 6583 // Only consider previous declarations in the same scope. 6584 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6585 /*ExplicitInstantiationOrSpecialization*/false); 6586 if (!Previous.empty()) { 6587 Redeclaration = true; 6588 6589 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6590 if (!OldDecl && !Invalid) { 6591 Diag(UsingLoc, diag::err_redefinition_different_kind) 6592 << Name.Identifier; 6593 6594 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6595 if (OldD->getLocation().isValid()) 6596 Diag(OldD->getLocation(), diag::note_previous_definition); 6597 6598 Invalid = true; 6599 } 6600 6601 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6602 if (TemplateParameterListsAreEqual(TemplateParams, 6603 OldDecl->getTemplateParameters(), 6604 /*Complain=*/true, 6605 TPL_TemplateMatch)) 6606 OldTemplateParams = OldDecl->getTemplateParameters(); 6607 else 6608 Invalid = true; 6609 6610 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6611 if (!Invalid && 6612 !Context.hasSameType(OldTD->getUnderlyingType(), 6613 NewTD->getUnderlyingType())) { 6614 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6615 // but we can't reasonably accept it. 6616 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6617 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6618 if (OldTD->getLocation().isValid()) 6619 Diag(OldTD->getLocation(), diag::note_previous_definition); 6620 Invalid = true; 6621 } 6622 } 6623 } 6624 6625 // Merge any previous default template arguments into our parameters, 6626 // and check the parameter list. 6627 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6628 TPC_TypeAliasTemplate)) 6629 return 0; 6630 6631 TypeAliasTemplateDecl *NewDecl = 6632 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6633 Name.Identifier, TemplateParams, 6634 NewTD); 6635 6636 NewDecl->setAccess(AS); 6637 6638 if (Invalid) 6639 NewDecl->setInvalidDecl(); 6640 else if (OldDecl) 6641 NewDecl->setPreviousDeclaration(OldDecl); 6642 6643 NewND = NewDecl; 6644 } else { 6645 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6646 NewND = NewTD; 6647 } 6648 6649 if (!Redeclaration) 6650 PushOnScopeChains(NewND, S); 6651 6652 return NewND; 6653} 6654 6655Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6656 SourceLocation NamespaceLoc, 6657 SourceLocation AliasLoc, 6658 IdentifierInfo *Alias, 6659 CXXScopeSpec &SS, 6660 SourceLocation IdentLoc, 6661 IdentifierInfo *Ident) { 6662 6663 // Lookup the namespace name. 6664 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6665 LookupParsedName(R, S, &SS); 6666 6667 // Check if we have a previous declaration with the same name. 6668 NamedDecl *PrevDecl 6669 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6670 ForRedeclaration); 6671 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6672 PrevDecl = 0; 6673 6674 if (PrevDecl) { 6675 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6676 // We already have an alias with the same name that points to the same 6677 // namespace, so don't create a new one. 6678 // FIXME: At some point, we'll want to create the (redundant) 6679 // declaration to maintain better source information. 6680 if (!R.isAmbiguous() && !R.empty() && 6681 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6682 return 0; 6683 } 6684 6685 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6686 diag::err_redefinition_different_kind; 6687 Diag(AliasLoc, DiagID) << Alias; 6688 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6689 return 0; 6690 } 6691 6692 if (R.isAmbiguous()) 6693 return 0; 6694 6695 if (R.empty()) { 6696 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6697 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6698 return 0; 6699 } 6700 } 6701 6702 NamespaceAliasDecl *AliasDecl = 6703 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6704 Alias, SS.getWithLocInContext(Context), 6705 IdentLoc, R.getFoundDecl()); 6706 6707 PushOnScopeChains(AliasDecl, S); 6708 return AliasDecl; 6709} 6710 6711namespace { 6712 /// \brief Scoped object used to handle the state changes required in Sema 6713 /// to implicitly define the body of a C++ member function; 6714 class ImplicitlyDefinedFunctionScope { 6715 Sema &S; 6716 Sema::ContextRAII SavedContext; 6717 6718 public: 6719 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6720 : S(S), SavedContext(S, Method) 6721 { 6722 S.PushFunctionScope(); 6723 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6724 } 6725 6726 ~ImplicitlyDefinedFunctionScope() { 6727 S.PopExpressionEvaluationContext(); 6728 S.PopFunctionScopeInfo(); 6729 } 6730 }; 6731} 6732 6733Sema::ImplicitExceptionSpecification 6734Sema::ComputeDefaultedDefaultCtorExceptionSpec(SourceLocation Loc, 6735 CXXMethodDecl *MD) { 6736 CXXRecordDecl *ClassDecl = MD->getParent(); 6737 6738 // C++ [except.spec]p14: 6739 // An implicitly declared special member function (Clause 12) shall have an 6740 // exception-specification. [...] 6741 ImplicitExceptionSpecification ExceptSpec(*this); 6742 if (ClassDecl->isInvalidDecl()) 6743 return ExceptSpec; 6744 6745 // Direct base-class constructors. 6746 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6747 BEnd = ClassDecl->bases_end(); 6748 B != BEnd; ++B) { 6749 if (B->isVirtual()) // Handled below. 6750 continue; 6751 6752 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6753 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6754 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6755 // If this is a deleted function, add it anyway. This might be conformant 6756 // with the standard. This might not. I'm not sure. It might not matter. 6757 if (Constructor) 6758 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6759 } 6760 } 6761 6762 // Virtual base-class constructors. 6763 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6764 BEnd = ClassDecl->vbases_end(); 6765 B != BEnd; ++B) { 6766 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6767 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6768 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6769 // If this is a deleted function, add it anyway. This might be conformant 6770 // with the standard. This might not. I'm not sure. It might not matter. 6771 if (Constructor) 6772 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6773 } 6774 } 6775 6776 // Field constructors. 6777 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6778 FEnd = ClassDecl->field_end(); 6779 F != FEnd; ++F) { 6780 if (F->hasInClassInitializer()) { 6781 if (Expr *E = F->getInClassInitializer()) 6782 ExceptSpec.CalledExpr(E); 6783 else if (!F->isInvalidDecl()) 6784 // DR1351: 6785 // If the brace-or-equal-initializer of a non-static data member 6786 // invokes a defaulted default constructor of its class or of an 6787 // enclosing class in a potentially evaluated subexpression, the 6788 // program is ill-formed. 6789 // 6790 // This resolution is unworkable: the exception specification of the 6791 // default constructor can be needed in an unevaluated context, in 6792 // particular, in the operand of a noexcept-expression, and we can be 6793 // unable to compute an exception specification for an enclosed class. 6794 // 6795 // We do not allow an in-class initializer to require the evaluation 6796 // of the exception specification for any in-class initializer whose 6797 // definition is not lexically complete. 6798 Diag(Loc, diag::err_in_class_initializer_references_def_ctor) << MD; 6799 } else if (const RecordType *RecordTy 6800 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6801 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6802 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6803 // If this is a deleted function, add it anyway. This might be conformant 6804 // with the standard. This might not. I'm not sure. It might not matter. 6805 // In particular, the problem is that this function never gets called. It 6806 // might just be ill-formed because this function attempts to refer to 6807 // a deleted function here. 6808 if (Constructor) 6809 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 6810 } 6811 } 6812 6813 return ExceptSpec; 6814} 6815 6816CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6817 CXXRecordDecl *ClassDecl) { 6818 // C++ [class.ctor]p5: 6819 // A default constructor for a class X is a constructor of class X 6820 // that can be called without an argument. If there is no 6821 // user-declared constructor for class X, a default constructor is 6822 // implicitly declared. An implicitly-declared default constructor 6823 // is an inline public member of its class. 6824 assert(!ClassDecl->hasUserDeclaredConstructor() && 6825 "Should not build implicit default constructor!"); 6826 6827 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 6828 CXXDefaultConstructor, 6829 false); 6830 6831 // Create the actual constructor declaration. 6832 CanQualType ClassType 6833 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6834 SourceLocation ClassLoc = ClassDecl->getLocation(); 6835 DeclarationName Name 6836 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6837 DeclarationNameInfo NameInfo(Name, ClassLoc); 6838 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 6839 Context, ClassDecl, ClassLoc, NameInfo, /*Type*/QualType(), /*TInfo=*/0, 6840 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 6841 Constexpr); 6842 DefaultCon->setAccess(AS_public); 6843 DefaultCon->setDefaulted(); 6844 DefaultCon->setImplicit(); 6845 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6846 6847 // Build an exception specification pointing back at this constructor. 6848 FunctionProtoType::ExtProtoInfo EPI; 6849 EPI.ExceptionSpecType = EST_Unevaluated; 6850 EPI.ExceptionSpecDecl = DefaultCon; 6851 DefaultCon->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6852 6853 // Note that we have declared this constructor. 6854 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6855 6856 if (Scope *S = getScopeForContext(ClassDecl)) 6857 PushOnScopeChains(DefaultCon, S, false); 6858 ClassDecl->addDecl(DefaultCon); 6859 6860 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6861 DefaultCon->setDeletedAsWritten(); 6862 6863 return DefaultCon; 6864} 6865 6866void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6867 CXXConstructorDecl *Constructor) { 6868 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6869 !Constructor->doesThisDeclarationHaveABody() && 6870 !Constructor->isDeleted()) && 6871 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6872 6873 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6874 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6875 6876 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6877 DiagnosticErrorTrap Trap(Diags); 6878 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6879 Trap.hasErrorOccurred()) { 6880 Diag(CurrentLocation, diag::note_member_synthesized_at) 6881 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6882 Constructor->setInvalidDecl(); 6883 return; 6884 } 6885 6886 SourceLocation Loc = Constructor->getLocation(); 6887 Constructor->setBody(new (Context) CompoundStmt(Loc)); 6888 6889 Constructor->setUsed(); 6890 MarkVTableUsed(CurrentLocation, ClassDecl); 6891 6892 if (ASTMutationListener *L = getASTMutationListener()) { 6893 L->CompletedImplicitDefinition(Constructor); 6894 } 6895} 6896 6897void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6898 if (!D) return; 6899 AdjustDeclIfTemplate(D); 6900 6901 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6902 6903 if (!ClassDecl->isDependentType()) 6904 CheckExplicitlyDefaultedMethods(ClassDecl); 6905} 6906 6907void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6908 // We start with an initial pass over the base classes to collect those that 6909 // inherit constructors from. If there are none, we can forgo all further 6910 // processing. 6911 typedef SmallVector<const RecordType *, 4> BasesVector; 6912 BasesVector BasesToInheritFrom; 6913 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6914 BaseE = ClassDecl->bases_end(); 6915 BaseIt != BaseE; ++BaseIt) { 6916 if (BaseIt->getInheritConstructors()) { 6917 QualType Base = BaseIt->getType(); 6918 if (Base->isDependentType()) { 6919 // If we inherit constructors from anything that is dependent, just 6920 // abort processing altogether. We'll get another chance for the 6921 // instantiations. 6922 return; 6923 } 6924 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6925 } 6926 } 6927 if (BasesToInheritFrom.empty()) 6928 return; 6929 6930 // Now collect the constructors that we already have in the current class. 6931 // Those take precedence over inherited constructors. 6932 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6933 // unless there is a user-declared constructor with the same signature in 6934 // the class where the using-declaration appears. 6935 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6936 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6937 CtorE = ClassDecl->ctor_end(); 6938 CtorIt != CtorE; ++CtorIt) { 6939 ExistingConstructors.insert( 6940 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6941 } 6942 6943 DeclarationName CreatedCtorName = 6944 Context.DeclarationNames.getCXXConstructorName( 6945 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6946 6947 // Now comes the true work. 6948 // First, we keep a map from constructor types to the base that introduced 6949 // them. Needed for finding conflicting constructors. We also keep the 6950 // actually inserted declarations in there, for pretty diagnostics. 6951 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6952 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6953 ConstructorToSourceMap InheritedConstructors; 6954 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6955 BaseE = BasesToInheritFrom.end(); 6956 BaseIt != BaseE; ++BaseIt) { 6957 const RecordType *Base = *BaseIt; 6958 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6959 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6960 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6961 CtorE = BaseDecl->ctor_end(); 6962 CtorIt != CtorE; ++CtorIt) { 6963 // Find the using declaration for inheriting this base's constructors. 6964 // FIXME: Don't perform name lookup just to obtain a source location! 6965 DeclarationName Name = 6966 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6967 LookupResult Result(*this, Name, SourceLocation(), LookupUsingDeclName); 6968 LookupQualifiedName(Result, CurContext); 6969 UsingDecl *UD = Result.getAsSingle<UsingDecl>(); 6970 SourceLocation UsingLoc = UD ? UD->getLocation() : 6971 ClassDecl->getLocation(); 6972 6973 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6974 // from the class X named in the using-declaration consists of actual 6975 // constructors and notional constructors that result from the 6976 // transformation of defaulted parameters as follows: 6977 // - all non-template default constructors of X, and 6978 // - for each non-template constructor of X that has at least one 6979 // parameter with a default argument, the set of constructors that 6980 // results from omitting any ellipsis parameter specification and 6981 // successively omitting parameters with a default argument from the 6982 // end of the parameter-type-list. 6983 CXXConstructorDecl *BaseCtor = *CtorIt; 6984 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6985 const FunctionProtoType *BaseCtorType = 6986 BaseCtor->getType()->getAs<FunctionProtoType>(); 6987 6988 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6989 maxParams = BaseCtor->getNumParams(); 6990 params <= maxParams; ++params) { 6991 // Skip default constructors. They're never inherited. 6992 if (params == 0) 6993 continue; 6994 // Skip copy and move constructors for the same reason. 6995 if (CanBeCopyOrMove && params == 1) 6996 continue; 6997 6998 // Build up a function type for this particular constructor. 6999 // FIXME: The working paper does not consider that the exception spec 7000 // for the inheriting constructor might be larger than that of the 7001 // source. This code doesn't yet, either. When it does, this code will 7002 // need to be delayed until after exception specifications and in-class 7003 // member initializers are attached. 7004 const Type *NewCtorType; 7005 if (params == maxParams) 7006 NewCtorType = BaseCtorType; 7007 else { 7008 SmallVector<QualType, 16> Args; 7009 for (unsigned i = 0; i < params; ++i) { 7010 Args.push_back(BaseCtorType->getArgType(i)); 7011 } 7012 FunctionProtoType::ExtProtoInfo ExtInfo = 7013 BaseCtorType->getExtProtoInfo(); 7014 ExtInfo.Variadic = false; 7015 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7016 Args.data(), params, ExtInfo) 7017 .getTypePtr(); 7018 } 7019 const Type *CanonicalNewCtorType = 7020 Context.getCanonicalType(NewCtorType); 7021 7022 // Now that we have the type, first check if the class already has a 7023 // constructor with this signature. 7024 if (ExistingConstructors.count(CanonicalNewCtorType)) 7025 continue; 7026 7027 // Then we check if we have already declared an inherited constructor 7028 // with this signature. 7029 std::pair<ConstructorToSourceMap::iterator, bool> result = 7030 InheritedConstructors.insert(std::make_pair( 7031 CanonicalNewCtorType, 7032 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7033 if (!result.second) { 7034 // Already in the map. If it came from a different class, that's an 7035 // error. Not if it's from the same. 7036 CanQualType PreviousBase = result.first->second.first; 7037 if (CanonicalBase != PreviousBase) { 7038 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7039 const CXXConstructorDecl *PrevBaseCtor = 7040 PrevCtor->getInheritedConstructor(); 7041 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7042 7043 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7044 Diag(BaseCtor->getLocation(), 7045 diag::note_using_decl_constructor_conflict_current_ctor); 7046 Diag(PrevBaseCtor->getLocation(), 7047 diag::note_using_decl_constructor_conflict_previous_ctor); 7048 Diag(PrevCtor->getLocation(), 7049 diag::note_using_decl_constructor_conflict_previous_using); 7050 } 7051 continue; 7052 } 7053 7054 // OK, we're there, now add the constructor. 7055 // C++0x [class.inhctor]p8: [...] that would be performed by a 7056 // user-written inline constructor [...] 7057 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7058 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7059 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7060 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7061 /*ImplicitlyDeclared=*/true, 7062 // FIXME: Due to a defect in the standard, we treat inherited 7063 // constructors as constexpr even if that makes them ill-formed. 7064 /*Constexpr=*/BaseCtor->isConstexpr()); 7065 NewCtor->setAccess(BaseCtor->getAccess()); 7066 7067 // Build up the parameter decls and add them. 7068 SmallVector<ParmVarDecl *, 16> ParamDecls; 7069 for (unsigned i = 0; i < params; ++i) { 7070 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7071 UsingLoc, UsingLoc, 7072 /*IdentifierInfo=*/0, 7073 BaseCtorType->getArgType(i), 7074 /*TInfo=*/0, SC_None, 7075 SC_None, /*DefaultArg=*/0)); 7076 } 7077 NewCtor->setParams(ParamDecls); 7078 NewCtor->setInheritedConstructor(BaseCtor); 7079 7080 ClassDecl->addDecl(NewCtor); 7081 result.first->second.second = NewCtor; 7082 } 7083 } 7084 } 7085} 7086 7087Sema::ImplicitExceptionSpecification 7088Sema::ComputeDefaultedDtorExceptionSpec(CXXMethodDecl *MD) { 7089 CXXRecordDecl *ClassDecl = MD->getParent(); 7090 7091 // C++ [except.spec]p14: 7092 // An implicitly declared special member function (Clause 12) shall have 7093 // an exception-specification. 7094 ImplicitExceptionSpecification ExceptSpec(*this); 7095 if (ClassDecl->isInvalidDecl()) 7096 return ExceptSpec; 7097 7098 // Direct base-class destructors. 7099 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7100 BEnd = ClassDecl->bases_end(); 7101 B != BEnd; ++B) { 7102 if (B->isVirtual()) // Handled below. 7103 continue; 7104 7105 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7106 ExceptSpec.CalledDecl(B->getLocStart(), 7107 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7108 } 7109 7110 // Virtual base-class destructors. 7111 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7112 BEnd = ClassDecl->vbases_end(); 7113 B != BEnd; ++B) { 7114 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7115 ExceptSpec.CalledDecl(B->getLocStart(), 7116 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7117 } 7118 7119 // Field destructors. 7120 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7121 FEnd = ClassDecl->field_end(); 7122 F != FEnd; ++F) { 7123 if (const RecordType *RecordTy 7124 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7125 ExceptSpec.CalledDecl(F->getLocation(), 7126 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7127 } 7128 7129 return ExceptSpec; 7130} 7131 7132CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7133 // C++ [class.dtor]p2: 7134 // If a class has no user-declared destructor, a destructor is 7135 // declared implicitly. An implicitly-declared destructor is an 7136 // inline public member of its class. 7137 7138 // Create the actual destructor declaration. 7139 CanQualType ClassType 7140 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7141 SourceLocation ClassLoc = ClassDecl->getLocation(); 7142 DeclarationName Name 7143 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7144 DeclarationNameInfo NameInfo(Name, ClassLoc); 7145 CXXDestructorDecl *Destructor 7146 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7147 QualType(), 0, /*isInline=*/true, 7148 /*isImplicitlyDeclared=*/true); 7149 Destructor->setAccess(AS_public); 7150 Destructor->setDefaulted(); 7151 Destructor->setImplicit(); 7152 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7153 7154 // Build an exception specification pointing back at this destructor. 7155 FunctionProtoType::ExtProtoInfo EPI; 7156 EPI.ExceptionSpecType = EST_Unevaluated; 7157 EPI.ExceptionSpecDecl = Destructor; 7158 Destructor->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7159 7160 // Note that we have declared this destructor. 7161 ++ASTContext::NumImplicitDestructorsDeclared; 7162 7163 // Introduce this destructor into its scope. 7164 if (Scope *S = getScopeForContext(ClassDecl)) 7165 PushOnScopeChains(Destructor, S, false); 7166 ClassDecl->addDecl(Destructor); 7167 7168 AddOverriddenMethods(ClassDecl, Destructor); 7169 7170 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 7171 Destructor->setDeletedAsWritten(); 7172 7173 return Destructor; 7174} 7175 7176void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7177 CXXDestructorDecl *Destructor) { 7178 assert((Destructor->isDefaulted() && 7179 !Destructor->doesThisDeclarationHaveABody() && 7180 !Destructor->isDeleted()) && 7181 "DefineImplicitDestructor - call it for implicit default dtor"); 7182 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7183 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7184 7185 if (Destructor->isInvalidDecl()) 7186 return; 7187 7188 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7189 7190 DiagnosticErrorTrap Trap(Diags); 7191 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7192 Destructor->getParent()); 7193 7194 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7195 Diag(CurrentLocation, diag::note_member_synthesized_at) 7196 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7197 7198 Destructor->setInvalidDecl(); 7199 return; 7200 } 7201 7202 SourceLocation Loc = Destructor->getLocation(); 7203 Destructor->setBody(new (Context) CompoundStmt(Loc)); 7204 Destructor->setImplicitlyDefined(true); 7205 Destructor->setUsed(); 7206 MarkVTableUsed(CurrentLocation, ClassDecl); 7207 7208 if (ASTMutationListener *L = getASTMutationListener()) { 7209 L->CompletedImplicitDefinition(Destructor); 7210 } 7211} 7212 7213/// \brief Perform any semantic analysis which needs to be delayed until all 7214/// pending class member declarations have been parsed. 7215void Sema::ActOnFinishCXXMemberDecls() { 7216 // Perform any deferred checking of exception specifications for virtual 7217 // destructors. 7218 for (unsigned i = 0, e = DelayedDestructorExceptionSpecChecks.size(); 7219 i != e; ++i) { 7220 const CXXDestructorDecl *Dtor = 7221 DelayedDestructorExceptionSpecChecks[i].first; 7222 assert(!Dtor->getParent()->isDependentType() && 7223 "Should not ever add destructors of templates into the list."); 7224 CheckOverridingFunctionExceptionSpec(Dtor, 7225 DelayedDestructorExceptionSpecChecks[i].second); 7226 } 7227 DelayedDestructorExceptionSpecChecks.clear(); 7228} 7229 7230void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *ClassDecl, 7231 CXXDestructorDecl *Destructor) { 7232 assert(getLangOpts().CPlusPlus0x && 7233 "adjusting dtor exception specs was introduced in c++11"); 7234 7235 // C++11 [class.dtor]p3: 7236 // A declaration of a destructor that does not have an exception- 7237 // specification is implicitly considered to have the same exception- 7238 // specification as an implicit declaration. 7239 const FunctionProtoType *DtorType = Destructor->getType()-> 7240 getAs<FunctionProtoType>(); 7241 if (DtorType->hasExceptionSpec()) 7242 return; 7243 7244 // Replace the destructor's type, building off the existing one. Fortunately, 7245 // the only thing of interest in the destructor type is its extended info. 7246 // The return and arguments are fixed. 7247 FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo(); 7248 EPI.ExceptionSpecType = EST_Unevaluated; 7249 EPI.ExceptionSpecDecl = Destructor; 7250 Destructor->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7251 7252 // FIXME: If the destructor has a body that could throw, and the newly created 7253 // spec doesn't allow exceptions, we should emit a warning, because this 7254 // change in behavior can break conforming C++03 programs at runtime. 7255 // However, we don't have a body or an exception specification yet, so it 7256 // needs to be done somewhere else. 7257} 7258 7259/// \brief Builds a statement that copies/moves the given entity from \p From to 7260/// \c To. 7261/// 7262/// This routine is used to copy/move the members of a class with an 7263/// implicitly-declared copy/move assignment operator. When the entities being 7264/// copied are arrays, this routine builds for loops to copy them. 7265/// 7266/// \param S The Sema object used for type-checking. 7267/// 7268/// \param Loc The location where the implicit copy/move is being generated. 7269/// 7270/// \param T The type of the expressions being copied/moved. Both expressions 7271/// must have this type. 7272/// 7273/// \param To The expression we are copying/moving to. 7274/// 7275/// \param From The expression we are copying/moving from. 7276/// 7277/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7278/// Otherwise, it's a non-static member subobject. 7279/// 7280/// \param Copying Whether we're copying or moving. 7281/// 7282/// \param Depth Internal parameter recording the depth of the recursion. 7283/// 7284/// \returns A statement or a loop that copies the expressions. 7285static StmtResult 7286BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7287 Expr *To, Expr *From, 7288 bool CopyingBaseSubobject, bool Copying, 7289 unsigned Depth = 0) { 7290 // C++0x [class.copy]p28: 7291 // Each subobject is assigned in the manner appropriate to its type: 7292 // 7293 // - if the subobject is of class type, as if by a call to operator= with 7294 // the subobject as the object expression and the corresponding 7295 // subobject of x as a single function argument (as if by explicit 7296 // qualification; that is, ignoring any possible virtual overriding 7297 // functions in more derived classes); 7298 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7299 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7300 7301 // Look for operator=. 7302 DeclarationName Name 7303 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7304 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7305 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7306 7307 // Filter out any result that isn't a copy/move-assignment operator. 7308 LookupResult::Filter F = OpLookup.makeFilter(); 7309 while (F.hasNext()) { 7310 NamedDecl *D = F.next(); 7311 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7312 if (Method->isCopyAssignmentOperator() || 7313 (!Copying && Method->isMoveAssignmentOperator())) 7314 continue; 7315 7316 F.erase(); 7317 } 7318 F.done(); 7319 7320 // Suppress the protected check (C++ [class.protected]) for each of the 7321 // assignment operators we found. This strange dance is required when 7322 // we're assigning via a base classes's copy-assignment operator. To 7323 // ensure that we're getting the right base class subobject (without 7324 // ambiguities), we need to cast "this" to that subobject type; to 7325 // ensure that we don't go through the virtual call mechanism, we need 7326 // to qualify the operator= name with the base class (see below). However, 7327 // this means that if the base class has a protected copy assignment 7328 // operator, the protected member access check will fail. So, we 7329 // rewrite "protected" access to "public" access in this case, since we 7330 // know by construction that we're calling from a derived class. 7331 if (CopyingBaseSubobject) { 7332 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7333 L != LEnd; ++L) { 7334 if (L.getAccess() == AS_protected) 7335 L.setAccess(AS_public); 7336 } 7337 } 7338 7339 // Create the nested-name-specifier that will be used to qualify the 7340 // reference to operator=; this is required to suppress the virtual 7341 // call mechanism. 7342 CXXScopeSpec SS; 7343 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 7344 SS.MakeTrivial(S.Context, 7345 NestedNameSpecifier::Create(S.Context, 0, false, 7346 CanonicalT), 7347 Loc); 7348 7349 // Create the reference to operator=. 7350 ExprResult OpEqualRef 7351 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7352 /*TemplateKWLoc=*/SourceLocation(), 7353 /*FirstQualifierInScope=*/0, 7354 OpLookup, 7355 /*TemplateArgs=*/0, 7356 /*SuppressQualifierCheck=*/true); 7357 if (OpEqualRef.isInvalid()) 7358 return StmtError(); 7359 7360 // Build the call to the assignment operator. 7361 7362 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7363 OpEqualRef.takeAs<Expr>(), 7364 Loc, &From, 1, Loc); 7365 if (Call.isInvalid()) 7366 return StmtError(); 7367 7368 return S.Owned(Call.takeAs<Stmt>()); 7369 } 7370 7371 // - if the subobject is of scalar type, the built-in assignment 7372 // operator is used. 7373 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7374 if (!ArrayTy) { 7375 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7376 if (Assignment.isInvalid()) 7377 return StmtError(); 7378 7379 return S.Owned(Assignment.takeAs<Stmt>()); 7380 } 7381 7382 // - if the subobject is an array, each element is assigned, in the 7383 // manner appropriate to the element type; 7384 7385 // Construct a loop over the array bounds, e.g., 7386 // 7387 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7388 // 7389 // that will copy each of the array elements. 7390 QualType SizeType = S.Context.getSizeType(); 7391 7392 // Create the iteration variable. 7393 IdentifierInfo *IterationVarName = 0; 7394 { 7395 SmallString<8> Str; 7396 llvm::raw_svector_ostream OS(Str); 7397 OS << "__i" << Depth; 7398 IterationVarName = &S.Context.Idents.get(OS.str()); 7399 } 7400 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7401 IterationVarName, SizeType, 7402 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7403 SC_None, SC_None); 7404 7405 // Initialize the iteration variable to zero. 7406 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7407 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7408 7409 // Create a reference to the iteration variable; we'll use this several 7410 // times throughout. 7411 Expr *IterationVarRef 7412 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 7413 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7414 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 7415 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 7416 7417 // Create the DeclStmt that holds the iteration variable. 7418 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7419 7420 // Create the comparison against the array bound. 7421 llvm::APInt Upper 7422 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7423 Expr *Comparison 7424 = new (S.Context) BinaryOperator(IterationVarRefRVal, 7425 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7426 BO_NE, S.Context.BoolTy, 7427 VK_RValue, OK_Ordinary, Loc); 7428 7429 // Create the pre-increment of the iteration variable. 7430 Expr *Increment 7431 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7432 VK_LValue, OK_Ordinary, Loc); 7433 7434 // Subscript the "from" and "to" expressions with the iteration variable. 7435 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7436 IterationVarRefRVal, 7437 Loc)); 7438 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7439 IterationVarRefRVal, 7440 Loc)); 7441 if (!Copying) // Cast to rvalue 7442 From = CastForMoving(S, From); 7443 7444 // Build the copy/move for an individual element of the array. 7445 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7446 To, From, CopyingBaseSubobject, 7447 Copying, Depth + 1); 7448 if (Copy.isInvalid()) 7449 return StmtError(); 7450 7451 // Construct the loop that copies all elements of this array. 7452 return S.ActOnForStmt(Loc, Loc, InitStmt, 7453 S.MakeFullExpr(Comparison), 7454 0, S.MakeFullExpr(Increment), 7455 Loc, Copy.take()); 7456} 7457 7458/// Determine whether an implicit copy assignment operator for ClassDecl has a 7459/// const argument. 7460/// FIXME: It ought to be possible to store this on the record. 7461static bool isImplicitCopyAssignmentArgConst(Sema &S, 7462 CXXRecordDecl *ClassDecl) { 7463 if (ClassDecl->isInvalidDecl()) 7464 return true; 7465 7466 // C++ [class.copy]p10: 7467 // If the class definition does not explicitly declare a copy 7468 // assignment operator, one is declared implicitly. 7469 // The implicitly-defined copy assignment operator for a class X 7470 // will have the form 7471 // 7472 // X& X::operator=(const X&) 7473 // 7474 // if 7475 // -- each direct base class B of X has a copy assignment operator 7476 // whose parameter is of type const B&, const volatile B& or B, 7477 // and 7478 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7479 BaseEnd = ClassDecl->bases_end(); 7480 Base != BaseEnd; ++Base) { 7481 // We'll handle this below 7482 if (S.getLangOpts().CPlusPlus0x && Base->isVirtual()) 7483 continue; 7484 7485 assert(!Base->getType()->isDependentType() && 7486 "Cannot generate implicit members for class with dependent bases."); 7487 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7488 if (!S.LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0)) 7489 return false; 7490 } 7491 7492 // In C++11, the above citation has "or virtual" added 7493 if (S.getLangOpts().CPlusPlus0x) { 7494 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7495 BaseEnd = ClassDecl->vbases_end(); 7496 Base != BaseEnd; ++Base) { 7497 assert(!Base->getType()->isDependentType() && 7498 "Cannot generate implicit members for class with dependent bases."); 7499 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7500 if (!S.LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, 7501 false, 0)) 7502 return false; 7503 } 7504 } 7505 7506 // -- for all the nonstatic data members of X that are of a class 7507 // type M (or array thereof), each such class type has a copy 7508 // assignment operator whose parameter is of type const M&, 7509 // const volatile M& or M. 7510 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7511 FieldEnd = ClassDecl->field_end(); 7512 Field != FieldEnd; ++Field) { 7513 QualType FieldType = S.Context.getBaseElementType(Field->getType()); 7514 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) 7515 if (!S.LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, 7516 false, 0)) 7517 return false; 7518 } 7519 7520 // Otherwise, the implicitly declared copy assignment operator will 7521 // have the form 7522 // 7523 // X& X::operator=(X&) 7524 7525 return true; 7526} 7527 7528Sema::ImplicitExceptionSpecification 7529Sema::ComputeDefaultedCopyAssignmentExceptionSpec(CXXMethodDecl *MD) { 7530 CXXRecordDecl *ClassDecl = MD->getParent(); 7531 7532 ImplicitExceptionSpecification ExceptSpec(*this); 7533 if (ClassDecl->isInvalidDecl()) 7534 return ExceptSpec; 7535 7536 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 7537 assert(T->getNumArgs() == 1 && "not a copy assignment op"); 7538 unsigned ArgQuals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 7539 7540 // C++ [except.spec]p14: 7541 // An implicitly declared special member function (Clause 12) shall have an 7542 // exception-specification. [...] 7543 7544 // It is unspecified whether or not an implicit copy assignment operator 7545 // attempts to deduplicate calls to assignment operators of virtual bases are 7546 // made. As such, this exception specification is effectively unspecified. 7547 // Based on a similar decision made for constness in C++0x, we're erring on 7548 // the side of assuming such calls to be made regardless of whether they 7549 // actually happen. 7550 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7551 BaseEnd = ClassDecl->bases_end(); 7552 Base != BaseEnd; ++Base) { 7553 if (Base->isVirtual()) 7554 continue; 7555 7556 CXXRecordDecl *BaseClassDecl 7557 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7558 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7559 ArgQuals, false, 0)) 7560 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7561 } 7562 7563 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7564 BaseEnd = ClassDecl->vbases_end(); 7565 Base != BaseEnd; ++Base) { 7566 CXXRecordDecl *BaseClassDecl 7567 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7568 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7569 ArgQuals, false, 0)) 7570 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7571 } 7572 7573 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7574 FieldEnd = ClassDecl->field_end(); 7575 Field != FieldEnd; 7576 ++Field) { 7577 QualType FieldType = Context.getBaseElementType(Field->getType()); 7578 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7579 if (CXXMethodDecl *CopyAssign = 7580 LookupCopyingAssignment(FieldClassDecl, 7581 ArgQuals | FieldType.getCVRQualifiers(), 7582 false, 0)) 7583 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign); 7584 } 7585 } 7586 7587 return ExceptSpec; 7588} 7589 7590CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7591 // Note: The following rules are largely analoguous to the copy 7592 // constructor rules. Note that virtual bases are not taken into account 7593 // for determining the argument type of the operator. Note also that 7594 // operators taking an object instead of a reference are allowed. 7595 7596 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7597 QualType RetType = Context.getLValueReferenceType(ArgType); 7598 if (isImplicitCopyAssignmentArgConst(*this, ClassDecl)) 7599 ArgType = ArgType.withConst(); 7600 ArgType = Context.getLValueReferenceType(ArgType); 7601 7602 // An implicitly-declared copy assignment operator is an inline public 7603 // member of its class. 7604 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7605 SourceLocation ClassLoc = ClassDecl->getLocation(); 7606 DeclarationNameInfo NameInfo(Name, ClassLoc); 7607 CXXMethodDecl *CopyAssignment 7608 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 7609 /*TInfo=*/0, /*isStatic=*/false, 7610 /*StorageClassAsWritten=*/SC_None, 7611 /*isInline=*/true, /*isConstexpr=*/false, 7612 SourceLocation()); 7613 CopyAssignment->setAccess(AS_public); 7614 CopyAssignment->setDefaulted(); 7615 CopyAssignment->setImplicit(); 7616 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7617 7618 // Build an exception specification pointing back at this member. 7619 FunctionProtoType::ExtProtoInfo EPI; 7620 EPI.ExceptionSpecType = EST_Unevaluated; 7621 EPI.ExceptionSpecDecl = CopyAssignment; 7622 CopyAssignment->setType(Context.getFunctionType(RetType, &ArgType, 1, EPI)); 7623 7624 // Add the parameter to the operator. 7625 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7626 ClassLoc, ClassLoc, /*Id=*/0, 7627 ArgType, /*TInfo=*/0, 7628 SC_None, 7629 SC_None, 0); 7630 CopyAssignment->setParams(FromParam); 7631 7632 // Note that we have added this copy-assignment operator. 7633 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7634 7635 if (Scope *S = getScopeForContext(ClassDecl)) 7636 PushOnScopeChains(CopyAssignment, S, false); 7637 ClassDecl->addDecl(CopyAssignment); 7638 7639 // C++0x [class.copy]p19: 7640 // .... If the class definition does not explicitly declare a copy 7641 // assignment operator, there is no user-declared move constructor, and 7642 // there is no user-declared move assignment operator, a copy assignment 7643 // operator is implicitly declared as defaulted. 7644 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 7645 CopyAssignment->setDeletedAsWritten(); 7646 7647 AddOverriddenMethods(ClassDecl, CopyAssignment); 7648 return CopyAssignment; 7649} 7650 7651void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7652 CXXMethodDecl *CopyAssignOperator) { 7653 assert((CopyAssignOperator->isDefaulted() && 7654 CopyAssignOperator->isOverloadedOperator() && 7655 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7656 !CopyAssignOperator->doesThisDeclarationHaveABody() && 7657 !CopyAssignOperator->isDeleted()) && 7658 "DefineImplicitCopyAssignment called for wrong function"); 7659 7660 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7661 7662 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7663 CopyAssignOperator->setInvalidDecl(); 7664 return; 7665 } 7666 7667 CopyAssignOperator->setUsed(); 7668 7669 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7670 DiagnosticErrorTrap Trap(Diags); 7671 7672 // C++0x [class.copy]p30: 7673 // The implicitly-defined or explicitly-defaulted copy assignment operator 7674 // for a non-union class X performs memberwise copy assignment of its 7675 // subobjects. The direct base classes of X are assigned first, in the 7676 // order of their declaration in the base-specifier-list, and then the 7677 // immediate non-static data members of X are assigned, in the order in 7678 // which they were declared in the class definition. 7679 7680 // The statements that form the synthesized function body. 7681 ASTOwningVector<Stmt*> Statements(*this); 7682 7683 // The parameter for the "other" object, which we are copying from. 7684 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7685 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7686 QualType OtherRefType = Other->getType(); 7687 if (const LValueReferenceType *OtherRef 7688 = OtherRefType->getAs<LValueReferenceType>()) { 7689 OtherRefType = OtherRef->getPointeeType(); 7690 OtherQuals = OtherRefType.getQualifiers(); 7691 } 7692 7693 // Our location for everything implicitly-generated. 7694 SourceLocation Loc = CopyAssignOperator->getLocation(); 7695 7696 // Construct a reference to the "other" object. We'll be using this 7697 // throughout the generated ASTs. 7698 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7699 assert(OtherRef && "Reference to parameter cannot fail!"); 7700 7701 // Construct the "this" pointer. We'll be using this throughout the generated 7702 // ASTs. 7703 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7704 assert(This && "Reference to this cannot fail!"); 7705 7706 // Assign base classes. 7707 bool Invalid = false; 7708 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7709 E = ClassDecl->bases_end(); Base != E; ++Base) { 7710 // Form the assignment: 7711 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7712 QualType BaseType = Base->getType().getUnqualifiedType(); 7713 if (!BaseType->isRecordType()) { 7714 Invalid = true; 7715 continue; 7716 } 7717 7718 CXXCastPath BasePath; 7719 BasePath.push_back(Base); 7720 7721 // Construct the "from" expression, which is an implicit cast to the 7722 // appropriately-qualified base type. 7723 Expr *From = OtherRef; 7724 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7725 CK_UncheckedDerivedToBase, 7726 VK_LValue, &BasePath).take(); 7727 7728 // Dereference "this". 7729 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7730 7731 // Implicitly cast "this" to the appropriately-qualified base type. 7732 To = ImpCastExprToType(To.take(), 7733 Context.getCVRQualifiedType(BaseType, 7734 CopyAssignOperator->getTypeQualifiers()), 7735 CK_UncheckedDerivedToBase, 7736 VK_LValue, &BasePath); 7737 7738 // Build the copy. 7739 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7740 To.get(), From, 7741 /*CopyingBaseSubobject=*/true, 7742 /*Copying=*/true); 7743 if (Copy.isInvalid()) { 7744 Diag(CurrentLocation, diag::note_member_synthesized_at) 7745 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7746 CopyAssignOperator->setInvalidDecl(); 7747 return; 7748 } 7749 7750 // Success! Record the copy. 7751 Statements.push_back(Copy.takeAs<Expr>()); 7752 } 7753 7754 // \brief Reference to the __builtin_memcpy function. 7755 Expr *BuiltinMemCpyRef = 0; 7756 // \brief Reference to the __builtin_objc_memmove_collectable function. 7757 Expr *CollectableMemCpyRef = 0; 7758 7759 // Assign non-static members. 7760 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7761 FieldEnd = ClassDecl->field_end(); 7762 Field != FieldEnd; ++Field) { 7763 if (Field->isUnnamedBitfield()) 7764 continue; 7765 7766 // Check for members of reference type; we can't copy those. 7767 if (Field->getType()->isReferenceType()) { 7768 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7769 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7770 Diag(Field->getLocation(), diag::note_declared_at); 7771 Diag(CurrentLocation, diag::note_member_synthesized_at) 7772 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7773 Invalid = true; 7774 continue; 7775 } 7776 7777 // Check for members of const-qualified, non-class type. 7778 QualType BaseType = Context.getBaseElementType(Field->getType()); 7779 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7780 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7781 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7782 Diag(Field->getLocation(), diag::note_declared_at); 7783 Diag(CurrentLocation, diag::note_member_synthesized_at) 7784 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7785 Invalid = true; 7786 continue; 7787 } 7788 7789 // Suppress assigning zero-width bitfields. 7790 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7791 continue; 7792 7793 QualType FieldType = Field->getType().getNonReferenceType(); 7794 if (FieldType->isIncompleteArrayType()) { 7795 assert(ClassDecl->hasFlexibleArrayMember() && 7796 "Incomplete array type is not valid"); 7797 continue; 7798 } 7799 7800 // Build references to the field in the object we're copying from and to. 7801 CXXScopeSpec SS; // Intentionally empty 7802 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7803 LookupMemberName); 7804 MemberLookup.addDecl(*Field); 7805 MemberLookup.resolveKind(); 7806 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7807 Loc, /*IsArrow=*/false, 7808 SS, SourceLocation(), 0, 7809 MemberLookup, 0); 7810 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7811 Loc, /*IsArrow=*/true, 7812 SS, SourceLocation(), 0, 7813 MemberLookup, 0); 7814 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7815 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7816 7817 // If the field should be copied with __builtin_memcpy rather than via 7818 // explicit assignments, do so. This optimization only applies for arrays 7819 // of scalars and arrays of class type with trivial copy-assignment 7820 // operators. 7821 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7822 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7823 // Compute the size of the memory buffer to be copied. 7824 QualType SizeType = Context.getSizeType(); 7825 llvm::APInt Size(Context.getTypeSize(SizeType), 7826 Context.getTypeSizeInChars(BaseType).getQuantity()); 7827 for (const ConstantArrayType *Array 7828 = Context.getAsConstantArrayType(FieldType); 7829 Array; 7830 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7831 llvm::APInt ArraySize 7832 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7833 Size *= ArraySize; 7834 } 7835 7836 // Take the address of the field references for "from" and "to". 7837 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7838 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7839 7840 bool NeedsCollectableMemCpy = 7841 (BaseType->isRecordType() && 7842 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7843 7844 if (NeedsCollectableMemCpy) { 7845 if (!CollectableMemCpyRef) { 7846 // Create a reference to the __builtin_objc_memmove_collectable function. 7847 LookupResult R(*this, 7848 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7849 Loc, LookupOrdinaryName); 7850 LookupName(R, TUScope, true); 7851 7852 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7853 if (!CollectableMemCpy) { 7854 // Something went horribly wrong earlier, and we will have 7855 // complained about it. 7856 Invalid = true; 7857 continue; 7858 } 7859 7860 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7861 CollectableMemCpy->getType(), 7862 VK_LValue, Loc, 0).take(); 7863 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7864 } 7865 } 7866 // Create a reference to the __builtin_memcpy builtin function. 7867 else if (!BuiltinMemCpyRef) { 7868 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7869 LookupOrdinaryName); 7870 LookupName(R, TUScope, true); 7871 7872 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7873 if (!BuiltinMemCpy) { 7874 // Something went horribly wrong earlier, and we will have complained 7875 // about it. 7876 Invalid = true; 7877 continue; 7878 } 7879 7880 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7881 BuiltinMemCpy->getType(), 7882 VK_LValue, Loc, 0).take(); 7883 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7884 } 7885 7886 ASTOwningVector<Expr*> CallArgs(*this); 7887 CallArgs.push_back(To.takeAs<Expr>()); 7888 CallArgs.push_back(From.takeAs<Expr>()); 7889 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7890 ExprResult Call = ExprError(); 7891 if (NeedsCollectableMemCpy) 7892 Call = ActOnCallExpr(/*Scope=*/0, 7893 CollectableMemCpyRef, 7894 Loc, move_arg(CallArgs), 7895 Loc); 7896 else 7897 Call = ActOnCallExpr(/*Scope=*/0, 7898 BuiltinMemCpyRef, 7899 Loc, move_arg(CallArgs), 7900 Loc); 7901 7902 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7903 Statements.push_back(Call.takeAs<Expr>()); 7904 continue; 7905 } 7906 7907 // Build the copy of this field. 7908 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7909 To.get(), From.get(), 7910 /*CopyingBaseSubobject=*/false, 7911 /*Copying=*/true); 7912 if (Copy.isInvalid()) { 7913 Diag(CurrentLocation, diag::note_member_synthesized_at) 7914 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7915 CopyAssignOperator->setInvalidDecl(); 7916 return; 7917 } 7918 7919 // Success! Record the copy. 7920 Statements.push_back(Copy.takeAs<Stmt>()); 7921 } 7922 7923 if (!Invalid) { 7924 // Add a "return *this;" 7925 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7926 7927 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7928 if (Return.isInvalid()) 7929 Invalid = true; 7930 else { 7931 Statements.push_back(Return.takeAs<Stmt>()); 7932 7933 if (Trap.hasErrorOccurred()) { 7934 Diag(CurrentLocation, diag::note_member_synthesized_at) 7935 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7936 Invalid = true; 7937 } 7938 } 7939 } 7940 7941 if (Invalid) { 7942 CopyAssignOperator->setInvalidDecl(); 7943 return; 7944 } 7945 7946 StmtResult Body; 7947 { 7948 CompoundScopeRAII CompoundScope(*this); 7949 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7950 /*isStmtExpr=*/false); 7951 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7952 } 7953 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7954 7955 if (ASTMutationListener *L = getASTMutationListener()) { 7956 L->CompletedImplicitDefinition(CopyAssignOperator); 7957 } 7958} 7959 7960Sema::ImplicitExceptionSpecification 7961Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXMethodDecl *MD) { 7962 CXXRecordDecl *ClassDecl = MD->getParent(); 7963 7964 ImplicitExceptionSpecification ExceptSpec(*this); 7965 if (ClassDecl->isInvalidDecl()) 7966 return ExceptSpec; 7967 7968 // C++0x [except.spec]p14: 7969 // An implicitly declared special member function (Clause 12) shall have an 7970 // exception-specification. [...] 7971 7972 // It is unspecified whether or not an implicit move assignment operator 7973 // attempts to deduplicate calls to assignment operators of virtual bases are 7974 // made. As such, this exception specification is effectively unspecified. 7975 // Based on a similar decision made for constness in C++0x, we're erring on 7976 // the side of assuming such calls to be made regardless of whether they 7977 // actually happen. 7978 // Note that a move constructor is not implicitly declared when there are 7979 // virtual bases, but it can still be user-declared and explicitly defaulted. 7980 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7981 BaseEnd = ClassDecl->bases_end(); 7982 Base != BaseEnd; ++Base) { 7983 if (Base->isVirtual()) 7984 continue; 7985 7986 CXXRecordDecl *BaseClassDecl 7987 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7988 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7989 0, false, 0)) 7990 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 7991 } 7992 7993 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7994 BaseEnd = ClassDecl->vbases_end(); 7995 Base != BaseEnd; ++Base) { 7996 CXXRecordDecl *BaseClassDecl 7997 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7998 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7999 0, false, 0)) 8000 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 8001 } 8002 8003 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8004 FieldEnd = ClassDecl->field_end(); 8005 Field != FieldEnd; 8006 ++Field) { 8007 QualType FieldType = Context.getBaseElementType(Field->getType()); 8008 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8009 if (CXXMethodDecl *MoveAssign = 8010 LookupMovingAssignment(FieldClassDecl, 8011 FieldType.getCVRQualifiers(), 8012 false, 0)) 8013 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign); 8014 } 8015 } 8016 8017 return ExceptSpec; 8018} 8019 8020/// Determine whether the class type has any direct or indirect virtual base 8021/// classes which have a non-trivial move assignment operator. 8022static bool 8023hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) { 8024 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8025 BaseEnd = ClassDecl->vbases_end(); 8026 Base != BaseEnd; ++Base) { 8027 CXXRecordDecl *BaseClass = 8028 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8029 8030 // Try to declare the move assignment. If it would be deleted, then the 8031 // class does not have a non-trivial move assignment. 8032 if (BaseClass->needsImplicitMoveAssignment()) 8033 S.DeclareImplicitMoveAssignment(BaseClass); 8034 8035 // If the class has both a trivial move assignment and a non-trivial move 8036 // assignment, hasTrivialMoveAssignment() is false. 8037 if (BaseClass->hasDeclaredMoveAssignment() && 8038 !BaseClass->hasTrivialMoveAssignment()) 8039 return true; 8040 } 8041 8042 return false; 8043} 8044 8045/// Determine whether the given type either has a move constructor or is 8046/// trivially copyable. 8047static bool 8048hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) { 8049 Type = S.Context.getBaseElementType(Type); 8050 8051 // FIXME: Technically, non-trivially-copyable non-class types, such as 8052 // reference types, are supposed to return false here, but that appears 8053 // to be a standard defect. 8054 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl(); 8055 if (!ClassDecl || !ClassDecl->getDefinition()) 8056 return true; 8057 8058 if (Type.isTriviallyCopyableType(S.Context)) 8059 return true; 8060 8061 if (IsConstructor) { 8062 if (ClassDecl->needsImplicitMoveConstructor()) 8063 S.DeclareImplicitMoveConstructor(ClassDecl); 8064 return ClassDecl->hasDeclaredMoveConstructor(); 8065 } 8066 8067 if (ClassDecl->needsImplicitMoveAssignment()) 8068 S.DeclareImplicitMoveAssignment(ClassDecl); 8069 return ClassDecl->hasDeclaredMoveAssignment(); 8070} 8071 8072/// Determine whether all non-static data members and direct or virtual bases 8073/// of class \p ClassDecl have either a move operation, or are trivially 8074/// copyable. 8075static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl, 8076 bool IsConstructor) { 8077 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8078 BaseEnd = ClassDecl->bases_end(); 8079 Base != BaseEnd; ++Base) { 8080 if (Base->isVirtual()) 8081 continue; 8082 8083 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8084 return false; 8085 } 8086 8087 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8088 BaseEnd = ClassDecl->vbases_end(); 8089 Base != BaseEnd; ++Base) { 8090 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8091 return false; 8092 } 8093 8094 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8095 FieldEnd = ClassDecl->field_end(); 8096 Field != FieldEnd; ++Field) { 8097 if (!hasMoveOrIsTriviallyCopyable(S, Field->getType(), IsConstructor)) 8098 return false; 8099 } 8100 8101 return true; 8102} 8103 8104CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8105 // C++11 [class.copy]p20: 8106 // If the definition of a class X does not explicitly declare a move 8107 // assignment operator, one will be implicitly declared as defaulted 8108 // if and only if: 8109 // 8110 // - [first 4 bullets] 8111 assert(ClassDecl->needsImplicitMoveAssignment()); 8112 8113 // [Checked after we build the declaration] 8114 // - the move assignment operator would not be implicitly defined as 8115 // deleted, 8116 8117 // [DR1402]: 8118 // - X has no direct or indirect virtual base class with a non-trivial 8119 // move assignment operator, and 8120 // - each of X's non-static data members and direct or virtual base classes 8121 // has a type that either has a move assignment operator or is trivially 8122 // copyable. 8123 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) || 8124 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) { 8125 ClassDecl->setFailedImplicitMoveAssignment(); 8126 return 0; 8127 } 8128 8129 // Note: The following rules are largely analoguous to the move 8130 // constructor rules. 8131 8132 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8133 QualType RetType = Context.getLValueReferenceType(ArgType); 8134 ArgType = Context.getRValueReferenceType(ArgType); 8135 8136 // An implicitly-declared move assignment operator is an inline public 8137 // member of its class. 8138 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8139 SourceLocation ClassLoc = ClassDecl->getLocation(); 8140 DeclarationNameInfo NameInfo(Name, ClassLoc); 8141 CXXMethodDecl *MoveAssignment 8142 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 8143 /*TInfo=*/0, /*isStatic=*/false, 8144 /*StorageClassAsWritten=*/SC_None, 8145 /*isInline=*/true, 8146 /*isConstexpr=*/false, 8147 SourceLocation()); 8148 MoveAssignment->setAccess(AS_public); 8149 MoveAssignment->setDefaulted(); 8150 MoveAssignment->setImplicit(); 8151 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8152 8153 // Build an exception specification pointing back at this member. 8154 FunctionProtoType::ExtProtoInfo EPI; 8155 EPI.ExceptionSpecType = EST_Unevaluated; 8156 EPI.ExceptionSpecDecl = MoveAssignment; 8157 MoveAssignment->setType(Context.getFunctionType(RetType, &ArgType, 1, EPI)); 8158 8159 // Add the parameter to the operator. 8160 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8161 ClassLoc, ClassLoc, /*Id=*/0, 8162 ArgType, /*TInfo=*/0, 8163 SC_None, 8164 SC_None, 0); 8165 MoveAssignment->setParams(FromParam); 8166 8167 // Note that we have added this copy-assignment operator. 8168 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8169 8170 // C++0x [class.copy]p9: 8171 // If the definition of a class X does not explicitly declare a move 8172 // assignment operator, one will be implicitly declared as defaulted if and 8173 // only if: 8174 // [...] 8175 // - the move assignment operator would not be implicitly defined as 8176 // deleted. 8177 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 8178 // Cache this result so that we don't try to generate this over and over 8179 // on every lookup, leaking memory and wasting time. 8180 ClassDecl->setFailedImplicitMoveAssignment(); 8181 return 0; 8182 } 8183 8184 if (Scope *S = getScopeForContext(ClassDecl)) 8185 PushOnScopeChains(MoveAssignment, S, false); 8186 ClassDecl->addDecl(MoveAssignment); 8187 8188 AddOverriddenMethods(ClassDecl, MoveAssignment); 8189 return MoveAssignment; 8190} 8191 8192void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8193 CXXMethodDecl *MoveAssignOperator) { 8194 assert((MoveAssignOperator->isDefaulted() && 8195 MoveAssignOperator->isOverloadedOperator() && 8196 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8197 !MoveAssignOperator->doesThisDeclarationHaveABody() && 8198 !MoveAssignOperator->isDeleted()) && 8199 "DefineImplicitMoveAssignment called for wrong function"); 8200 8201 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8202 8203 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8204 MoveAssignOperator->setInvalidDecl(); 8205 return; 8206 } 8207 8208 MoveAssignOperator->setUsed(); 8209 8210 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8211 DiagnosticErrorTrap Trap(Diags); 8212 8213 // C++0x [class.copy]p28: 8214 // The implicitly-defined or move assignment operator for a non-union class 8215 // X performs memberwise move assignment of its subobjects. The direct base 8216 // classes of X are assigned first, in the order of their declaration in the 8217 // base-specifier-list, and then the immediate non-static data members of X 8218 // are assigned, in the order in which they were declared in the class 8219 // definition. 8220 8221 // The statements that form the synthesized function body. 8222 ASTOwningVector<Stmt*> Statements(*this); 8223 8224 // The parameter for the "other" object, which we are move from. 8225 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8226 QualType OtherRefType = Other->getType()-> 8227 getAs<RValueReferenceType>()->getPointeeType(); 8228 assert(OtherRefType.getQualifiers() == 0 && 8229 "Bad argument type of defaulted move assignment"); 8230 8231 // Our location for everything implicitly-generated. 8232 SourceLocation Loc = MoveAssignOperator->getLocation(); 8233 8234 // Construct a reference to the "other" object. We'll be using this 8235 // throughout the generated ASTs. 8236 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8237 assert(OtherRef && "Reference to parameter cannot fail!"); 8238 // Cast to rvalue. 8239 OtherRef = CastForMoving(*this, OtherRef); 8240 8241 // Construct the "this" pointer. We'll be using this throughout the generated 8242 // ASTs. 8243 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8244 assert(This && "Reference to this cannot fail!"); 8245 8246 // Assign base classes. 8247 bool Invalid = false; 8248 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8249 E = ClassDecl->bases_end(); Base != E; ++Base) { 8250 // Form the assignment: 8251 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8252 QualType BaseType = Base->getType().getUnqualifiedType(); 8253 if (!BaseType->isRecordType()) { 8254 Invalid = true; 8255 continue; 8256 } 8257 8258 CXXCastPath BasePath; 8259 BasePath.push_back(Base); 8260 8261 // Construct the "from" expression, which is an implicit cast to the 8262 // appropriately-qualified base type. 8263 Expr *From = OtherRef; 8264 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8265 VK_XValue, &BasePath).take(); 8266 8267 // Dereference "this". 8268 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8269 8270 // Implicitly cast "this" to the appropriately-qualified base type. 8271 To = ImpCastExprToType(To.take(), 8272 Context.getCVRQualifiedType(BaseType, 8273 MoveAssignOperator->getTypeQualifiers()), 8274 CK_UncheckedDerivedToBase, 8275 VK_LValue, &BasePath); 8276 8277 // Build the move. 8278 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8279 To.get(), From, 8280 /*CopyingBaseSubobject=*/true, 8281 /*Copying=*/false); 8282 if (Move.isInvalid()) { 8283 Diag(CurrentLocation, diag::note_member_synthesized_at) 8284 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8285 MoveAssignOperator->setInvalidDecl(); 8286 return; 8287 } 8288 8289 // Success! Record the move. 8290 Statements.push_back(Move.takeAs<Expr>()); 8291 } 8292 8293 // \brief Reference to the __builtin_memcpy function. 8294 Expr *BuiltinMemCpyRef = 0; 8295 // \brief Reference to the __builtin_objc_memmove_collectable function. 8296 Expr *CollectableMemCpyRef = 0; 8297 8298 // Assign non-static members. 8299 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8300 FieldEnd = ClassDecl->field_end(); 8301 Field != FieldEnd; ++Field) { 8302 if (Field->isUnnamedBitfield()) 8303 continue; 8304 8305 // Check for members of reference type; we can't move those. 8306 if (Field->getType()->isReferenceType()) { 8307 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8308 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8309 Diag(Field->getLocation(), diag::note_declared_at); 8310 Diag(CurrentLocation, diag::note_member_synthesized_at) 8311 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8312 Invalid = true; 8313 continue; 8314 } 8315 8316 // Check for members of const-qualified, non-class type. 8317 QualType BaseType = Context.getBaseElementType(Field->getType()); 8318 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8319 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8320 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8321 Diag(Field->getLocation(), diag::note_declared_at); 8322 Diag(CurrentLocation, diag::note_member_synthesized_at) 8323 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8324 Invalid = true; 8325 continue; 8326 } 8327 8328 // Suppress assigning zero-width bitfields. 8329 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8330 continue; 8331 8332 QualType FieldType = Field->getType().getNonReferenceType(); 8333 if (FieldType->isIncompleteArrayType()) { 8334 assert(ClassDecl->hasFlexibleArrayMember() && 8335 "Incomplete array type is not valid"); 8336 continue; 8337 } 8338 8339 // Build references to the field in the object we're copying from and to. 8340 CXXScopeSpec SS; // Intentionally empty 8341 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8342 LookupMemberName); 8343 MemberLookup.addDecl(*Field); 8344 MemberLookup.resolveKind(); 8345 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8346 Loc, /*IsArrow=*/false, 8347 SS, SourceLocation(), 0, 8348 MemberLookup, 0); 8349 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8350 Loc, /*IsArrow=*/true, 8351 SS, SourceLocation(), 0, 8352 MemberLookup, 0); 8353 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8354 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8355 8356 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8357 "Member reference with rvalue base must be rvalue except for reference " 8358 "members, which aren't allowed for move assignment."); 8359 8360 // If the field should be copied with __builtin_memcpy rather than via 8361 // explicit assignments, do so. This optimization only applies for arrays 8362 // of scalars and arrays of class type with trivial move-assignment 8363 // operators. 8364 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8365 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8366 // Compute the size of the memory buffer to be copied. 8367 QualType SizeType = Context.getSizeType(); 8368 llvm::APInt Size(Context.getTypeSize(SizeType), 8369 Context.getTypeSizeInChars(BaseType).getQuantity()); 8370 for (const ConstantArrayType *Array 8371 = Context.getAsConstantArrayType(FieldType); 8372 Array; 8373 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8374 llvm::APInt ArraySize 8375 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8376 Size *= ArraySize; 8377 } 8378 8379 // Take the address of the field references for "from" and "to". We 8380 // directly construct UnaryOperators here because semantic analysis 8381 // does not permit us to take the address of an xvalue. 8382 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8383 Context.getPointerType(From.get()->getType()), 8384 VK_RValue, OK_Ordinary, Loc); 8385 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8386 Context.getPointerType(To.get()->getType()), 8387 VK_RValue, OK_Ordinary, Loc); 8388 8389 bool NeedsCollectableMemCpy = 8390 (BaseType->isRecordType() && 8391 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8392 8393 if (NeedsCollectableMemCpy) { 8394 if (!CollectableMemCpyRef) { 8395 // Create a reference to the __builtin_objc_memmove_collectable function. 8396 LookupResult R(*this, 8397 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8398 Loc, LookupOrdinaryName); 8399 LookupName(R, TUScope, true); 8400 8401 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8402 if (!CollectableMemCpy) { 8403 // Something went horribly wrong earlier, and we will have 8404 // complained about it. 8405 Invalid = true; 8406 continue; 8407 } 8408 8409 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8410 CollectableMemCpy->getType(), 8411 VK_LValue, Loc, 0).take(); 8412 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8413 } 8414 } 8415 // Create a reference to the __builtin_memcpy builtin function. 8416 else if (!BuiltinMemCpyRef) { 8417 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8418 LookupOrdinaryName); 8419 LookupName(R, TUScope, true); 8420 8421 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8422 if (!BuiltinMemCpy) { 8423 // Something went horribly wrong earlier, and we will have complained 8424 // about it. 8425 Invalid = true; 8426 continue; 8427 } 8428 8429 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8430 BuiltinMemCpy->getType(), 8431 VK_LValue, Loc, 0).take(); 8432 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8433 } 8434 8435 ASTOwningVector<Expr*> CallArgs(*this); 8436 CallArgs.push_back(To.takeAs<Expr>()); 8437 CallArgs.push_back(From.takeAs<Expr>()); 8438 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8439 ExprResult Call = ExprError(); 8440 if (NeedsCollectableMemCpy) 8441 Call = ActOnCallExpr(/*Scope=*/0, 8442 CollectableMemCpyRef, 8443 Loc, move_arg(CallArgs), 8444 Loc); 8445 else 8446 Call = ActOnCallExpr(/*Scope=*/0, 8447 BuiltinMemCpyRef, 8448 Loc, move_arg(CallArgs), 8449 Loc); 8450 8451 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8452 Statements.push_back(Call.takeAs<Expr>()); 8453 continue; 8454 } 8455 8456 // Build the move of this field. 8457 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8458 To.get(), From.get(), 8459 /*CopyingBaseSubobject=*/false, 8460 /*Copying=*/false); 8461 if (Move.isInvalid()) { 8462 Diag(CurrentLocation, diag::note_member_synthesized_at) 8463 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8464 MoveAssignOperator->setInvalidDecl(); 8465 return; 8466 } 8467 8468 // Success! Record the copy. 8469 Statements.push_back(Move.takeAs<Stmt>()); 8470 } 8471 8472 if (!Invalid) { 8473 // Add a "return *this;" 8474 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8475 8476 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8477 if (Return.isInvalid()) 8478 Invalid = true; 8479 else { 8480 Statements.push_back(Return.takeAs<Stmt>()); 8481 8482 if (Trap.hasErrorOccurred()) { 8483 Diag(CurrentLocation, diag::note_member_synthesized_at) 8484 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8485 Invalid = true; 8486 } 8487 } 8488 } 8489 8490 if (Invalid) { 8491 MoveAssignOperator->setInvalidDecl(); 8492 return; 8493 } 8494 8495 StmtResult Body; 8496 { 8497 CompoundScopeRAII CompoundScope(*this); 8498 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8499 /*isStmtExpr=*/false); 8500 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8501 } 8502 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8503 8504 if (ASTMutationListener *L = getASTMutationListener()) { 8505 L->CompletedImplicitDefinition(MoveAssignOperator); 8506 } 8507} 8508 8509/// Determine whether an implicit copy constructor for ClassDecl has a const 8510/// argument. 8511/// FIXME: It ought to be possible to store this on the record. 8512static bool isImplicitCopyCtorArgConst(Sema &S, CXXRecordDecl *ClassDecl) { 8513 if (ClassDecl->isInvalidDecl()) 8514 return true; 8515 8516 // C++ [class.copy]p5: 8517 // The implicitly-declared copy constructor for a class X will 8518 // have the form 8519 // 8520 // X::X(const X&) 8521 // 8522 // if 8523 // -- each direct or virtual base class B of X has a copy 8524 // constructor whose first parameter is of type const B& or 8525 // const volatile B&, and 8526 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8527 BaseEnd = ClassDecl->bases_end(); 8528 Base != BaseEnd; ++Base) { 8529 // Virtual bases are handled below. 8530 if (Base->isVirtual()) 8531 continue; 8532 8533 CXXRecordDecl *BaseClassDecl 8534 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8535 // FIXME: This lookup is wrong. If the copy ctor for a member or base is 8536 // ambiguous, we should still produce a constructor with a const-qualified 8537 // parameter. 8538 if (!S.LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const)) 8539 return false; 8540 } 8541 8542 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8543 BaseEnd = ClassDecl->vbases_end(); 8544 Base != BaseEnd; ++Base) { 8545 CXXRecordDecl *BaseClassDecl 8546 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8547 if (!S.LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const)) 8548 return false; 8549 } 8550 8551 // -- for all the nonstatic data members of X that are of a 8552 // class type M (or array thereof), each such class type 8553 // has a copy constructor whose first parameter is of type 8554 // const M& or const volatile M&. 8555 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8556 FieldEnd = ClassDecl->field_end(); 8557 Field != FieldEnd; ++Field) { 8558 QualType FieldType = S.Context.getBaseElementType(Field->getType()); 8559 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8560 if (!S.LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const)) 8561 return false; 8562 } 8563 } 8564 8565 // Otherwise, the implicitly declared copy constructor will have 8566 // the form 8567 // 8568 // X::X(X&) 8569 8570 return true; 8571} 8572 8573Sema::ImplicitExceptionSpecification 8574Sema::ComputeDefaultedCopyCtorExceptionSpec(CXXMethodDecl *MD) { 8575 CXXRecordDecl *ClassDecl = MD->getParent(); 8576 8577 ImplicitExceptionSpecification ExceptSpec(*this); 8578 if (ClassDecl->isInvalidDecl()) 8579 return ExceptSpec; 8580 8581 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 8582 assert(T->getNumArgs() >= 1 && "not a copy ctor"); 8583 unsigned Quals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 8584 8585 // C++ [except.spec]p14: 8586 // An implicitly declared special member function (Clause 12) shall have an 8587 // exception-specification. [...] 8588 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8589 BaseEnd = ClassDecl->bases_end(); 8590 Base != BaseEnd; 8591 ++Base) { 8592 // Virtual bases are handled below. 8593 if (Base->isVirtual()) 8594 continue; 8595 8596 CXXRecordDecl *BaseClassDecl 8597 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8598 if (CXXConstructorDecl *CopyConstructor = 8599 LookupCopyingConstructor(BaseClassDecl, Quals)) 8600 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8601 } 8602 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8603 BaseEnd = ClassDecl->vbases_end(); 8604 Base != BaseEnd; 8605 ++Base) { 8606 CXXRecordDecl *BaseClassDecl 8607 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8608 if (CXXConstructorDecl *CopyConstructor = 8609 LookupCopyingConstructor(BaseClassDecl, Quals)) 8610 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8611 } 8612 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8613 FieldEnd = ClassDecl->field_end(); 8614 Field != FieldEnd; 8615 ++Field) { 8616 QualType FieldType = Context.getBaseElementType(Field->getType()); 8617 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8618 if (CXXConstructorDecl *CopyConstructor = 8619 LookupCopyingConstructor(FieldClassDecl, 8620 Quals | FieldType.getCVRQualifiers())) 8621 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor); 8622 } 8623 } 8624 8625 return ExceptSpec; 8626} 8627 8628CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8629 CXXRecordDecl *ClassDecl) { 8630 // C++ [class.copy]p4: 8631 // If the class definition does not explicitly declare a copy 8632 // constructor, one is declared implicitly. 8633 8634 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8635 QualType ArgType = ClassType; 8636 bool Const = isImplicitCopyCtorArgConst(*this, ClassDecl); 8637 if (Const) 8638 ArgType = ArgType.withConst(); 8639 ArgType = Context.getLValueReferenceType(ArgType); 8640 8641 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8642 CXXCopyConstructor, 8643 Const); 8644 8645 DeclarationName Name 8646 = Context.DeclarationNames.getCXXConstructorName( 8647 Context.getCanonicalType(ClassType)); 8648 SourceLocation ClassLoc = ClassDecl->getLocation(); 8649 DeclarationNameInfo NameInfo(Name, ClassLoc); 8650 8651 // An implicitly-declared copy constructor is an inline public 8652 // member of its class. 8653 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8654 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 8655 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8656 Constexpr); 8657 CopyConstructor->setAccess(AS_public); 8658 CopyConstructor->setDefaulted(); 8659 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8660 8661 // Build an exception specification pointing back at this member. 8662 FunctionProtoType::ExtProtoInfo EPI; 8663 EPI.ExceptionSpecType = EST_Unevaluated; 8664 EPI.ExceptionSpecDecl = CopyConstructor; 8665 CopyConstructor->setType( 8666 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 8667 8668 // Note that we have declared this constructor. 8669 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8670 8671 // Add the parameter to the constructor. 8672 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8673 ClassLoc, ClassLoc, 8674 /*IdentifierInfo=*/0, 8675 ArgType, /*TInfo=*/0, 8676 SC_None, 8677 SC_None, 0); 8678 CopyConstructor->setParams(FromParam); 8679 8680 if (Scope *S = getScopeForContext(ClassDecl)) 8681 PushOnScopeChains(CopyConstructor, S, false); 8682 ClassDecl->addDecl(CopyConstructor); 8683 8684 // C++11 [class.copy]p8: 8685 // ... If the class definition does not explicitly declare a copy 8686 // constructor, there is no user-declared move constructor, and there is no 8687 // user-declared move assignment operator, a copy constructor is implicitly 8688 // declared as defaulted. 8689 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8690 CopyConstructor->setDeletedAsWritten(); 8691 8692 return CopyConstructor; 8693} 8694 8695void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8696 CXXConstructorDecl *CopyConstructor) { 8697 assert((CopyConstructor->isDefaulted() && 8698 CopyConstructor->isCopyConstructor() && 8699 !CopyConstructor->doesThisDeclarationHaveABody() && 8700 !CopyConstructor->isDeleted()) && 8701 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8702 8703 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8704 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8705 8706 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8707 DiagnosticErrorTrap Trap(Diags); 8708 8709 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8710 Trap.hasErrorOccurred()) { 8711 Diag(CurrentLocation, diag::note_member_synthesized_at) 8712 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8713 CopyConstructor->setInvalidDecl(); 8714 } else { 8715 Sema::CompoundScopeRAII CompoundScope(*this); 8716 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8717 CopyConstructor->getLocation(), 8718 MultiStmtArg(*this, 0, 0), 8719 /*isStmtExpr=*/false) 8720 .takeAs<Stmt>()); 8721 CopyConstructor->setImplicitlyDefined(true); 8722 } 8723 8724 CopyConstructor->setUsed(); 8725 if (ASTMutationListener *L = getASTMutationListener()) { 8726 L->CompletedImplicitDefinition(CopyConstructor); 8727 } 8728} 8729 8730Sema::ImplicitExceptionSpecification 8731Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXMethodDecl *MD) { 8732 CXXRecordDecl *ClassDecl = MD->getParent(); 8733 8734 // C++ [except.spec]p14: 8735 // An implicitly declared special member function (Clause 12) shall have an 8736 // exception-specification. [...] 8737 ImplicitExceptionSpecification ExceptSpec(*this); 8738 if (ClassDecl->isInvalidDecl()) 8739 return ExceptSpec; 8740 8741 // Direct base-class constructors. 8742 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8743 BEnd = ClassDecl->bases_end(); 8744 B != BEnd; ++B) { 8745 if (B->isVirtual()) // Handled below. 8746 continue; 8747 8748 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8749 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8750 CXXConstructorDecl *Constructor = 8751 LookupMovingConstructor(BaseClassDecl, 0); 8752 // If this is a deleted function, add it anyway. This might be conformant 8753 // with the standard. This might not. I'm not sure. It might not matter. 8754 if (Constructor) 8755 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8756 } 8757 } 8758 8759 // Virtual base-class constructors. 8760 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8761 BEnd = ClassDecl->vbases_end(); 8762 B != BEnd; ++B) { 8763 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8764 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8765 CXXConstructorDecl *Constructor = 8766 LookupMovingConstructor(BaseClassDecl, 0); 8767 // If this is a deleted function, add it anyway. This might be conformant 8768 // with the standard. This might not. I'm not sure. It might not matter. 8769 if (Constructor) 8770 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8771 } 8772 } 8773 8774 // Field constructors. 8775 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8776 FEnd = ClassDecl->field_end(); 8777 F != FEnd; ++F) { 8778 QualType FieldType = Context.getBaseElementType(F->getType()); 8779 if (CXXRecordDecl *FieldRecDecl = FieldType->getAsCXXRecordDecl()) { 8780 CXXConstructorDecl *Constructor = 8781 LookupMovingConstructor(FieldRecDecl, FieldType.getCVRQualifiers()); 8782 // If this is a deleted function, add it anyway. This might be conformant 8783 // with the standard. This might not. I'm not sure. It might not matter. 8784 // In particular, the problem is that this function never gets called. It 8785 // might just be ill-formed because this function attempts to refer to 8786 // a deleted function here. 8787 if (Constructor) 8788 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 8789 } 8790 } 8791 8792 return ExceptSpec; 8793} 8794 8795CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8796 CXXRecordDecl *ClassDecl) { 8797 // C++11 [class.copy]p9: 8798 // If the definition of a class X does not explicitly declare a move 8799 // constructor, one will be implicitly declared as defaulted if and only if: 8800 // 8801 // - [first 4 bullets] 8802 assert(ClassDecl->needsImplicitMoveConstructor()); 8803 8804 // [Checked after we build the declaration] 8805 // - the move assignment operator would not be implicitly defined as 8806 // deleted, 8807 8808 // [DR1402]: 8809 // - each of X's non-static data members and direct or virtual base classes 8810 // has a type that either has a move constructor or is trivially copyable. 8811 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) { 8812 ClassDecl->setFailedImplicitMoveConstructor(); 8813 return 0; 8814 } 8815 8816 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8817 QualType ArgType = Context.getRValueReferenceType(ClassType); 8818 8819 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8820 CXXMoveConstructor, 8821 false); 8822 8823 DeclarationName Name 8824 = Context.DeclarationNames.getCXXConstructorName( 8825 Context.getCanonicalType(ClassType)); 8826 SourceLocation ClassLoc = ClassDecl->getLocation(); 8827 DeclarationNameInfo NameInfo(Name, ClassLoc); 8828 8829 // C++0x [class.copy]p11: 8830 // An implicitly-declared copy/move constructor is an inline public 8831 // member of its class. 8832 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8833 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 8834 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8835 Constexpr); 8836 MoveConstructor->setAccess(AS_public); 8837 MoveConstructor->setDefaulted(); 8838 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8839 8840 // Build an exception specification pointing back at this member. 8841 FunctionProtoType::ExtProtoInfo EPI; 8842 EPI.ExceptionSpecType = EST_Unevaluated; 8843 EPI.ExceptionSpecDecl = MoveConstructor; 8844 MoveConstructor->setType( 8845 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 8846 8847 // Add the parameter to the constructor. 8848 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8849 ClassLoc, ClassLoc, 8850 /*IdentifierInfo=*/0, 8851 ArgType, /*TInfo=*/0, 8852 SC_None, 8853 SC_None, 0); 8854 MoveConstructor->setParams(FromParam); 8855 8856 // C++0x [class.copy]p9: 8857 // If the definition of a class X does not explicitly declare a move 8858 // constructor, one will be implicitly declared as defaulted if and only if: 8859 // [...] 8860 // - the move constructor would not be implicitly defined as deleted. 8861 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8862 // Cache this result so that we don't try to generate this over and over 8863 // on every lookup, leaking memory and wasting time. 8864 ClassDecl->setFailedImplicitMoveConstructor(); 8865 return 0; 8866 } 8867 8868 // Note that we have declared this constructor. 8869 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8870 8871 if (Scope *S = getScopeForContext(ClassDecl)) 8872 PushOnScopeChains(MoveConstructor, S, false); 8873 ClassDecl->addDecl(MoveConstructor); 8874 8875 return MoveConstructor; 8876} 8877 8878void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8879 CXXConstructorDecl *MoveConstructor) { 8880 assert((MoveConstructor->isDefaulted() && 8881 MoveConstructor->isMoveConstructor() && 8882 !MoveConstructor->doesThisDeclarationHaveABody() && 8883 !MoveConstructor->isDeleted()) && 8884 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8885 8886 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8887 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8888 8889 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8890 DiagnosticErrorTrap Trap(Diags); 8891 8892 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8893 Trap.hasErrorOccurred()) { 8894 Diag(CurrentLocation, diag::note_member_synthesized_at) 8895 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8896 MoveConstructor->setInvalidDecl(); 8897 } else { 8898 Sema::CompoundScopeRAII CompoundScope(*this); 8899 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8900 MoveConstructor->getLocation(), 8901 MultiStmtArg(*this, 0, 0), 8902 /*isStmtExpr=*/false) 8903 .takeAs<Stmt>()); 8904 MoveConstructor->setImplicitlyDefined(true); 8905 } 8906 8907 MoveConstructor->setUsed(); 8908 8909 if (ASTMutationListener *L = getASTMutationListener()) { 8910 L->CompletedImplicitDefinition(MoveConstructor); 8911 } 8912} 8913 8914bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 8915 return FD->isDeleted() && 8916 (FD->isDefaulted() || FD->isImplicit()) && 8917 isa<CXXMethodDecl>(FD); 8918} 8919 8920/// \brief Mark the call operator of the given lambda closure type as "used". 8921static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 8922 CXXMethodDecl *CallOperator 8923 = cast<CXXMethodDecl>( 8924 *Lambda->lookup( 8925 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).first); 8926 CallOperator->setReferenced(); 8927 CallOperator->setUsed(); 8928} 8929 8930void Sema::DefineImplicitLambdaToFunctionPointerConversion( 8931 SourceLocation CurrentLocation, 8932 CXXConversionDecl *Conv) 8933{ 8934 CXXRecordDecl *Lambda = Conv->getParent(); 8935 8936 // Make sure that the lambda call operator is marked used. 8937 markLambdaCallOperatorUsed(*this, Lambda); 8938 8939 Conv->setUsed(); 8940 8941 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8942 DiagnosticErrorTrap Trap(Diags); 8943 8944 // Return the address of the __invoke function. 8945 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 8946 CXXMethodDecl *Invoke 8947 = cast<CXXMethodDecl>(*Lambda->lookup(InvokeName).first); 8948 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 8949 VK_LValue, Conv->getLocation()).take(); 8950 assert(FunctionRef && "Can't refer to __invoke function?"); 8951 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 8952 Conv->setBody(new (Context) CompoundStmt(Context, &Return, 1, 8953 Conv->getLocation(), 8954 Conv->getLocation())); 8955 8956 // Fill in the __invoke function with a dummy implementation. IR generation 8957 // will fill in the actual details. 8958 Invoke->setUsed(); 8959 Invoke->setReferenced(); 8960 Invoke->setBody(new (Context) CompoundStmt(Conv->getLocation())); 8961 8962 if (ASTMutationListener *L = getASTMutationListener()) { 8963 L->CompletedImplicitDefinition(Conv); 8964 L->CompletedImplicitDefinition(Invoke); 8965 } 8966} 8967 8968void Sema::DefineImplicitLambdaToBlockPointerConversion( 8969 SourceLocation CurrentLocation, 8970 CXXConversionDecl *Conv) 8971{ 8972 Conv->setUsed(); 8973 8974 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8975 DiagnosticErrorTrap Trap(Diags); 8976 8977 // Copy-initialize the lambda object as needed to capture it. 8978 Expr *This = ActOnCXXThis(CurrentLocation).take(); 8979 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 8980 8981 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 8982 Conv->getLocation(), 8983 Conv, DerefThis); 8984 8985 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 8986 // behavior. Note that only the general conversion function does this 8987 // (since it's unusable otherwise); in the case where we inline the 8988 // block literal, it has block literal lifetime semantics. 8989 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 8990 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 8991 CK_CopyAndAutoreleaseBlockObject, 8992 BuildBlock.get(), 0, VK_RValue); 8993 8994 if (BuildBlock.isInvalid()) { 8995 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 8996 Conv->setInvalidDecl(); 8997 return; 8998 } 8999 9000 // Create the return statement that returns the block from the conversion 9001 // function. 9002 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 9003 if (Return.isInvalid()) { 9004 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9005 Conv->setInvalidDecl(); 9006 return; 9007 } 9008 9009 // Set the body of the conversion function. 9010 Stmt *ReturnS = Return.take(); 9011 Conv->setBody(new (Context) CompoundStmt(Context, &ReturnS, 1, 9012 Conv->getLocation(), 9013 Conv->getLocation())); 9014 9015 // We're done; notify the mutation listener, if any. 9016 if (ASTMutationListener *L = getASTMutationListener()) { 9017 L->CompletedImplicitDefinition(Conv); 9018 } 9019} 9020 9021/// \brief Determine whether the given list arguments contains exactly one 9022/// "real" (non-default) argument. 9023static bool hasOneRealArgument(MultiExprArg Args) { 9024 switch (Args.size()) { 9025 case 0: 9026 return false; 9027 9028 default: 9029 if (!Args.get()[1]->isDefaultArgument()) 9030 return false; 9031 9032 // fall through 9033 case 1: 9034 return !Args.get()[0]->isDefaultArgument(); 9035 } 9036 9037 return false; 9038} 9039 9040ExprResult 9041Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9042 CXXConstructorDecl *Constructor, 9043 MultiExprArg ExprArgs, 9044 bool HadMultipleCandidates, 9045 bool RequiresZeroInit, 9046 unsigned ConstructKind, 9047 SourceRange ParenRange) { 9048 bool Elidable = false; 9049 9050 // C++0x [class.copy]p34: 9051 // When certain criteria are met, an implementation is allowed to 9052 // omit the copy/move construction of a class object, even if the 9053 // copy/move constructor and/or destructor for the object have 9054 // side effects. [...] 9055 // - when a temporary class object that has not been bound to a 9056 // reference (12.2) would be copied/moved to a class object 9057 // with the same cv-unqualified type, the copy/move operation 9058 // can be omitted by constructing the temporary object 9059 // directly into the target of the omitted copy/move 9060 if (ConstructKind == CXXConstructExpr::CK_Complete && 9061 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 9062 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 9063 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 9064 } 9065 9066 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 9067 Elidable, move(ExprArgs), HadMultipleCandidates, 9068 RequiresZeroInit, ConstructKind, ParenRange); 9069} 9070 9071/// BuildCXXConstructExpr - Creates a complete call to a constructor, 9072/// including handling of its default argument expressions. 9073ExprResult 9074Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9075 CXXConstructorDecl *Constructor, bool Elidable, 9076 MultiExprArg ExprArgs, 9077 bool HadMultipleCandidates, 9078 bool RequiresZeroInit, 9079 unsigned ConstructKind, 9080 SourceRange ParenRange) { 9081 unsigned NumExprs = ExprArgs.size(); 9082 Expr **Exprs = (Expr **)ExprArgs.release(); 9083 9084 MarkFunctionReferenced(ConstructLoc, Constructor); 9085 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 9086 Constructor, Elidable, Exprs, NumExprs, 9087 HadMultipleCandidates, /*FIXME*/false, 9088 RequiresZeroInit, 9089 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 9090 ParenRange)); 9091} 9092 9093bool Sema::InitializeVarWithConstructor(VarDecl *VD, 9094 CXXConstructorDecl *Constructor, 9095 MultiExprArg Exprs, 9096 bool HadMultipleCandidates) { 9097 // FIXME: Provide the correct paren SourceRange when available. 9098 ExprResult TempResult = 9099 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 9100 move(Exprs), HadMultipleCandidates, false, 9101 CXXConstructExpr::CK_Complete, SourceRange()); 9102 if (TempResult.isInvalid()) 9103 return true; 9104 9105 Expr *Temp = TempResult.takeAs<Expr>(); 9106 CheckImplicitConversions(Temp, VD->getLocation()); 9107 MarkFunctionReferenced(VD->getLocation(), Constructor); 9108 Temp = MaybeCreateExprWithCleanups(Temp); 9109 VD->setInit(Temp); 9110 9111 return false; 9112} 9113 9114void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9115 if (VD->isInvalidDecl()) return; 9116 9117 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9118 if (ClassDecl->isInvalidDecl()) return; 9119 if (ClassDecl->hasIrrelevantDestructor()) return; 9120 if (ClassDecl->isDependentContext()) return; 9121 9122 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9123 MarkFunctionReferenced(VD->getLocation(), Destructor); 9124 CheckDestructorAccess(VD->getLocation(), Destructor, 9125 PDiag(diag::err_access_dtor_var) 9126 << VD->getDeclName() 9127 << VD->getType()); 9128 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 9129 9130 if (!VD->hasGlobalStorage()) return; 9131 9132 // Emit warning for non-trivial dtor in global scope (a real global, 9133 // class-static, function-static). 9134 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9135 9136 // TODO: this should be re-enabled for static locals by !CXAAtExit 9137 if (!VD->isStaticLocal()) 9138 Diag(VD->getLocation(), diag::warn_global_destructor); 9139} 9140 9141/// \brief Given a constructor and the set of arguments provided for the 9142/// constructor, convert the arguments and add any required default arguments 9143/// to form a proper call to this constructor. 9144/// 9145/// \returns true if an error occurred, false otherwise. 9146bool 9147Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9148 MultiExprArg ArgsPtr, 9149 SourceLocation Loc, 9150 ASTOwningVector<Expr*> &ConvertedArgs, 9151 bool AllowExplicit) { 9152 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9153 unsigned NumArgs = ArgsPtr.size(); 9154 Expr **Args = (Expr **)ArgsPtr.get(); 9155 9156 const FunctionProtoType *Proto 9157 = Constructor->getType()->getAs<FunctionProtoType>(); 9158 assert(Proto && "Constructor without a prototype?"); 9159 unsigned NumArgsInProto = Proto->getNumArgs(); 9160 9161 // If too few arguments are available, we'll fill in the rest with defaults. 9162 if (NumArgs < NumArgsInProto) 9163 ConvertedArgs.reserve(NumArgsInProto); 9164 else 9165 ConvertedArgs.reserve(NumArgs); 9166 9167 VariadicCallType CallType = 9168 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9169 SmallVector<Expr *, 8> AllArgs; 9170 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9171 Proto, 0, Args, NumArgs, AllArgs, 9172 CallType, AllowExplicit); 9173 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 9174 9175 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size()); 9176 9177 CheckConstructorCall(Constructor, AllArgs.data(), AllArgs.size(), 9178 Proto, Loc); 9179 9180 return Invalid; 9181} 9182 9183static inline bool 9184CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9185 const FunctionDecl *FnDecl) { 9186 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9187 if (isa<NamespaceDecl>(DC)) { 9188 return SemaRef.Diag(FnDecl->getLocation(), 9189 diag::err_operator_new_delete_declared_in_namespace) 9190 << FnDecl->getDeclName(); 9191 } 9192 9193 if (isa<TranslationUnitDecl>(DC) && 9194 FnDecl->getStorageClass() == SC_Static) { 9195 return SemaRef.Diag(FnDecl->getLocation(), 9196 diag::err_operator_new_delete_declared_static) 9197 << FnDecl->getDeclName(); 9198 } 9199 9200 return false; 9201} 9202 9203static inline bool 9204CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9205 CanQualType ExpectedResultType, 9206 CanQualType ExpectedFirstParamType, 9207 unsigned DependentParamTypeDiag, 9208 unsigned InvalidParamTypeDiag) { 9209 QualType ResultType = 9210 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9211 9212 // Check that the result type is not dependent. 9213 if (ResultType->isDependentType()) 9214 return SemaRef.Diag(FnDecl->getLocation(), 9215 diag::err_operator_new_delete_dependent_result_type) 9216 << FnDecl->getDeclName() << ExpectedResultType; 9217 9218 // Check that the result type is what we expect. 9219 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9220 return SemaRef.Diag(FnDecl->getLocation(), 9221 diag::err_operator_new_delete_invalid_result_type) 9222 << FnDecl->getDeclName() << ExpectedResultType; 9223 9224 // A function template must have at least 2 parameters. 9225 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9226 return SemaRef.Diag(FnDecl->getLocation(), 9227 diag::err_operator_new_delete_template_too_few_parameters) 9228 << FnDecl->getDeclName(); 9229 9230 // The function decl must have at least 1 parameter. 9231 if (FnDecl->getNumParams() == 0) 9232 return SemaRef.Diag(FnDecl->getLocation(), 9233 diag::err_operator_new_delete_too_few_parameters) 9234 << FnDecl->getDeclName(); 9235 9236 // Check the first parameter type is not dependent. 9237 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9238 if (FirstParamType->isDependentType()) 9239 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9240 << FnDecl->getDeclName() << ExpectedFirstParamType; 9241 9242 // Check that the first parameter type is what we expect. 9243 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9244 ExpectedFirstParamType) 9245 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9246 << FnDecl->getDeclName() << ExpectedFirstParamType; 9247 9248 return false; 9249} 9250 9251static bool 9252CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9253 // C++ [basic.stc.dynamic.allocation]p1: 9254 // A program is ill-formed if an allocation function is declared in a 9255 // namespace scope other than global scope or declared static in global 9256 // scope. 9257 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9258 return true; 9259 9260 CanQualType SizeTy = 9261 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9262 9263 // C++ [basic.stc.dynamic.allocation]p1: 9264 // The return type shall be void*. The first parameter shall have type 9265 // std::size_t. 9266 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9267 SizeTy, 9268 diag::err_operator_new_dependent_param_type, 9269 diag::err_operator_new_param_type)) 9270 return true; 9271 9272 // C++ [basic.stc.dynamic.allocation]p1: 9273 // The first parameter shall not have an associated default argument. 9274 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9275 return SemaRef.Diag(FnDecl->getLocation(), 9276 diag::err_operator_new_default_arg) 9277 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9278 9279 return false; 9280} 9281 9282static bool 9283CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9284 // C++ [basic.stc.dynamic.deallocation]p1: 9285 // A program is ill-formed if deallocation functions are declared in a 9286 // namespace scope other than global scope or declared static in global 9287 // scope. 9288 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9289 return true; 9290 9291 // C++ [basic.stc.dynamic.deallocation]p2: 9292 // Each deallocation function shall return void and its first parameter 9293 // shall be void*. 9294 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9295 SemaRef.Context.VoidPtrTy, 9296 diag::err_operator_delete_dependent_param_type, 9297 diag::err_operator_delete_param_type)) 9298 return true; 9299 9300 return false; 9301} 9302 9303/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9304/// of this overloaded operator is well-formed. If so, returns false; 9305/// otherwise, emits appropriate diagnostics and returns true. 9306bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9307 assert(FnDecl && FnDecl->isOverloadedOperator() && 9308 "Expected an overloaded operator declaration"); 9309 9310 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9311 9312 // C++ [over.oper]p5: 9313 // The allocation and deallocation functions, operator new, 9314 // operator new[], operator delete and operator delete[], are 9315 // described completely in 3.7.3. The attributes and restrictions 9316 // found in the rest of this subclause do not apply to them unless 9317 // explicitly stated in 3.7.3. 9318 if (Op == OO_Delete || Op == OO_Array_Delete) 9319 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9320 9321 if (Op == OO_New || Op == OO_Array_New) 9322 return CheckOperatorNewDeclaration(*this, FnDecl); 9323 9324 // C++ [over.oper]p6: 9325 // An operator function shall either be a non-static member 9326 // function or be a non-member function and have at least one 9327 // parameter whose type is a class, a reference to a class, an 9328 // enumeration, or a reference to an enumeration. 9329 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9330 if (MethodDecl->isStatic()) 9331 return Diag(FnDecl->getLocation(), 9332 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9333 } else { 9334 bool ClassOrEnumParam = false; 9335 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9336 ParamEnd = FnDecl->param_end(); 9337 Param != ParamEnd; ++Param) { 9338 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9339 if (ParamType->isDependentType() || ParamType->isRecordType() || 9340 ParamType->isEnumeralType()) { 9341 ClassOrEnumParam = true; 9342 break; 9343 } 9344 } 9345 9346 if (!ClassOrEnumParam) 9347 return Diag(FnDecl->getLocation(), 9348 diag::err_operator_overload_needs_class_or_enum) 9349 << FnDecl->getDeclName(); 9350 } 9351 9352 // C++ [over.oper]p8: 9353 // An operator function cannot have default arguments (8.3.6), 9354 // except where explicitly stated below. 9355 // 9356 // Only the function-call operator allows default arguments 9357 // (C++ [over.call]p1). 9358 if (Op != OO_Call) { 9359 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9360 Param != FnDecl->param_end(); ++Param) { 9361 if ((*Param)->hasDefaultArg()) 9362 return Diag((*Param)->getLocation(), 9363 diag::err_operator_overload_default_arg) 9364 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9365 } 9366 } 9367 9368 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9369 { false, false, false } 9370#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9371 , { Unary, Binary, MemberOnly } 9372#include "clang/Basic/OperatorKinds.def" 9373 }; 9374 9375 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9376 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9377 bool MustBeMemberOperator = OperatorUses[Op][2]; 9378 9379 // C++ [over.oper]p8: 9380 // [...] Operator functions cannot have more or fewer parameters 9381 // than the number required for the corresponding operator, as 9382 // described in the rest of this subclause. 9383 unsigned NumParams = FnDecl->getNumParams() 9384 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9385 if (Op != OO_Call && 9386 ((NumParams == 1 && !CanBeUnaryOperator) || 9387 (NumParams == 2 && !CanBeBinaryOperator) || 9388 (NumParams < 1) || (NumParams > 2))) { 9389 // We have the wrong number of parameters. 9390 unsigned ErrorKind; 9391 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9392 ErrorKind = 2; // 2 -> unary or binary. 9393 } else if (CanBeUnaryOperator) { 9394 ErrorKind = 0; // 0 -> unary 9395 } else { 9396 assert(CanBeBinaryOperator && 9397 "All non-call overloaded operators are unary or binary!"); 9398 ErrorKind = 1; // 1 -> binary 9399 } 9400 9401 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9402 << FnDecl->getDeclName() << NumParams << ErrorKind; 9403 } 9404 9405 // Overloaded operators other than operator() cannot be variadic. 9406 if (Op != OO_Call && 9407 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9408 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9409 << FnDecl->getDeclName(); 9410 } 9411 9412 // Some operators must be non-static member functions. 9413 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9414 return Diag(FnDecl->getLocation(), 9415 diag::err_operator_overload_must_be_member) 9416 << FnDecl->getDeclName(); 9417 } 9418 9419 // C++ [over.inc]p1: 9420 // The user-defined function called operator++ implements the 9421 // prefix and postfix ++ operator. If this function is a member 9422 // function with no parameters, or a non-member function with one 9423 // parameter of class or enumeration type, it defines the prefix 9424 // increment operator ++ for objects of that type. If the function 9425 // is a member function with one parameter (which shall be of type 9426 // int) or a non-member function with two parameters (the second 9427 // of which shall be of type int), it defines the postfix 9428 // increment operator ++ for objects of that type. 9429 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9430 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9431 bool ParamIsInt = false; 9432 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9433 ParamIsInt = BT->getKind() == BuiltinType::Int; 9434 9435 if (!ParamIsInt) 9436 return Diag(LastParam->getLocation(), 9437 diag::err_operator_overload_post_incdec_must_be_int) 9438 << LastParam->getType() << (Op == OO_MinusMinus); 9439 } 9440 9441 return false; 9442} 9443 9444/// CheckLiteralOperatorDeclaration - Check whether the declaration 9445/// of this literal operator function is well-formed. If so, returns 9446/// false; otherwise, emits appropriate diagnostics and returns true. 9447bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9448 if (isa<CXXMethodDecl>(FnDecl)) { 9449 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9450 << FnDecl->getDeclName(); 9451 return true; 9452 } 9453 9454 if (FnDecl->isExternC()) { 9455 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 9456 return true; 9457 } 9458 9459 bool Valid = false; 9460 9461 // This might be the definition of a literal operator template. 9462 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 9463 // This might be a specialization of a literal operator template. 9464 if (!TpDecl) 9465 TpDecl = FnDecl->getPrimaryTemplate(); 9466 9467 // template <char...> type operator "" name() is the only valid template 9468 // signature, and the only valid signature with no parameters. 9469 if (TpDecl) { 9470 if (FnDecl->param_size() == 0) { 9471 // Must have only one template parameter 9472 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9473 if (Params->size() == 1) { 9474 NonTypeTemplateParmDecl *PmDecl = 9475 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9476 9477 // The template parameter must be a char parameter pack. 9478 if (PmDecl && PmDecl->isTemplateParameterPack() && 9479 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9480 Valid = true; 9481 } 9482 } 9483 } else if (FnDecl->param_size()) { 9484 // Check the first parameter 9485 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9486 9487 QualType T = (*Param)->getType().getUnqualifiedType(); 9488 9489 // unsigned long long int, long double, and any character type are allowed 9490 // as the only parameters. 9491 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9492 Context.hasSameType(T, Context.LongDoubleTy) || 9493 Context.hasSameType(T, Context.CharTy) || 9494 Context.hasSameType(T, Context.WCharTy) || 9495 Context.hasSameType(T, Context.Char16Ty) || 9496 Context.hasSameType(T, Context.Char32Ty)) { 9497 if (++Param == FnDecl->param_end()) 9498 Valid = true; 9499 goto FinishedParams; 9500 } 9501 9502 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9503 const PointerType *PT = T->getAs<PointerType>(); 9504 if (!PT) 9505 goto FinishedParams; 9506 T = PT->getPointeeType(); 9507 if (!T.isConstQualified() || T.isVolatileQualified()) 9508 goto FinishedParams; 9509 T = T.getUnqualifiedType(); 9510 9511 // Move on to the second parameter; 9512 ++Param; 9513 9514 // If there is no second parameter, the first must be a const char * 9515 if (Param == FnDecl->param_end()) { 9516 if (Context.hasSameType(T, Context.CharTy)) 9517 Valid = true; 9518 goto FinishedParams; 9519 } 9520 9521 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9522 // are allowed as the first parameter to a two-parameter function 9523 if (!(Context.hasSameType(T, Context.CharTy) || 9524 Context.hasSameType(T, Context.WCharTy) || 9525 Context.hasSameType(T, Context.Char16Ty) || 9526 Context.hasSameType(T, Context.Char32Ty))) 9527 goto FinishedParams; 9528 9529 // The second and final parameter must be an std::size_t 9530 T = (*Param)->getType().getUnqualifiedType(); 9531 if (Context.hasSameType(T, Context.getSizeType()) && 9532 ++Param == FnDecl->param_end()) 9533 Valid = true; 9534 } 9535 9536 // FIXME: This diagnostic is absolutely terrible. 9537FinishedParams: 9538 if (!Valid) { 9539 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9540 << FnDecl->getDeclName(); 9541 return true; 9542 } 9543 9544 // A parameter-declaration-clause containing a default argument is not 9545 // equivalent to any of the permitted forms. 9546 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9547 ParamEnd = FnDecl->param_end(); 9548 Param != ParamEnd; ++Param) { 9549 if ((*Param)->hasDefaultArg()) { 9550 Diag((*Param)->getDefaultArgRange().getBegin(), 9551 diag::err_literal_operator_default_argument) 9552 << (*Param)->getDefaultArgRange(); 9553 break; 9554 } 9555 } 9556 9557 StringRef LiteralName 9558 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9559 if (LiteralName[0] != '_') { 9560 // C++11 [usrlit.suffix]p1: 9561 // Literal suffix identifiers that do not start with an underscore 9562 // are reserved for future standardization. 9563 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9564 } 9565 9566 return false; 9567} 9568 9569/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9570/// linkage specification, including the language and (if present) 9571/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9572/// the location of the language string literal, which is provided 9573/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9574/// the '{' brace. Otherwise, this linkage specification does not 9575/// have any braces. 9576Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9577 SourceLocation LangLoc, 9578 StringRef Lang, 9579 SourceLocation LBraceLoc) { 9580 LinkageSpecDecl::LanguageIDs Language; 9581 if (Lang == "\"C\"") 9582 Language = LinkageSpecDecl::lang_c; 9583 else if (Lang == "\"C++\"") 9584 Language = LinkageSpecDecl::lang_cxx; 9585 else { 9586 Diag(LangLoc, diag::err_bad_language); 9587 return 0; 9588 } 9589 9590 // FIXME: Add all the various semantics of linkage specifications 9591 9592 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9593 ExternLoc, LangLoc, Language); 9594 CurContext->addDecl(D); 9595 PushDeclContext(S, D); 9596 return D; 9597} 9598 9599/// ActOnFinishLinkageSpecification - Complete the definition of 9600/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9601/// valid, it's the position of the closing '}' brace in a linkage 9602/// specification that uses braces. 9603Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9604 Decl *LinkageSpec, 9605 SourceLocation RBraceLoc) { 9606 if (LinkageSpec) { 9607 if (RBraceLoc.isValid()) { 9608 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9609 LSDecl->setRBraceLoc(RBraceLoc); 9610 } 9611 PopDeclContext(); 9612 } 9613 return LinkageSpec; 9614} 9615 9616/// \brief Perform semantic analysis for the variable declaration that 9617/// occurs within a C++ catch clause, returning the newly-created 9618/// variable. 9619VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9620 TypeSourceInfo *TInfo, 9621 SourceLocation StartLoc, 9622 SourceLocation Loc, 9623 IdentifierInfo *Name) { 9624 bool Invalid = false; 9625 QualType ExDeclType = TInfo->getType(); 9626 9627 // Arrays and functions decay. 9628 if (ExDeclType->isArrayType()) 9629 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9630 else if (ExDeclType->isFunctionType()) 9631 ExDeclType = Context.getPointerType(ExDeclType); 9632 9633 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9634 // The exception-declaration shall not denote a pointer or reference to an 9635 // incomplete type, other than [cv] void*. 9636 // N2844 forbids rvalue references. 9637 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9638 Diag(Loc, diag::err_catch_rvalue_ref); 9639 Invalid = true; 9640 } 9641 9642 QualType BaseType = ExDeclType; 9643 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9644 unsigned DK = diag::err_catch_incomplete; 9645 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9646 BaseType = Ptr->getPointeeType(); 9647 Mode = 1; 9648 DK = diag::err_catch_incomplete_ptr; 9649 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9650 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9651 BaseType = Ref->getPointeeType(); 9652 Mode = 2; 9653 DK = diag::err_catch_incomplete_ref; 9654 } 9655 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9656 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 9657 Invalid = true; 9658 9659 if (!Invalid && !ExDeclType->isDependentType() && 9660 RequireNonAbstractType(Loc, ExDeclType, 9661 diag::err_abstract_type_in_decl, 9662 AbstractVariableType)) 9663 Invalid = true; 9664 9665 // Only the non-fragile NeXT runtime currently supports C++ catches 9666 // of ObjC types, and no runtime supports catching ObjC types by value. 9667 if (!Invalid && getLangOpts().ObjC1) { 9668 QualType T = ExDeclType; 9669 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9670 T = RT->getPointeeType(); 9671 9672 if (T->isObjCObjectType()) { 9673 Diag(Loc, diag::err_objc_object_catch); 9674 Invalid = true; 9675 } else if (T->isObjCObjectPointerType()) { 9676 // FIXME: should this be a test for macosx-fragile specifically? 9677 if (getLangOpts().ObjCRuntime.isFragile()) 9678 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9679 } 9680 } 9681 9682 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9683 ExDeclType, TInfo, SC_None, SC_None); 9684 ExDecl->setExceptionVariable(true); 9685 9686 // In ARC, infer 'retaining' for variables of retainable type. 9687 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9688 Invalid = true; 9689 9690 if (!Invalid && !ExDeclType->isDependentType()) { 9691 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9692 // C++ [except.handle]p16: 9693 // The object declared in an exception-declaration or, if the 9694 // exception-declaration does not specify a name, a temporary (12.2) is 9695 // copy-initialized (8.5) from the exception object. [...] 9696 // The object is destroyed when the handler exits, after the destruction 9697 // of any automatic objects initialized within the handler. 9698 // 9699 // We just pretend to initialize the object with itself, then make sure 9700 // it can be destroyed later. 9701 QualType initType = ExDeclType; 9702 9703 InitializedEntity entity = 9704 InitializedEntity::InitializeVariable(ExDecl); 9705 InitializationKind initKind = 9706 InitializationKind::CreateCopy(Loc, SourceLocation()); 9707 9708 Expr *opaqueValue = 9709 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9710 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9711 ExprResult result = sequence.Perform(*this, entity, initKind, 9712 MultiExprArg(&opaqueValue, 1)); 9713 if (result.isInvalid()) 9714 Invalid = true; 9715 else { 9716 // If the constructor used was non-trivial, set this as the 9717 // "initializer". 9718 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9719 if (!construct->getConstructor()->isTrivial()) { 9720 Expr *init = MaybeCreateExprWithCleanups(construct); 9721 ExDecl->setInit(init); 9722 } 9723 9724 // And make sure it's destructable. 9725 FinalizeVarWithDestructor(ExDecl, recordType); 9726 } 9727 } 9728 } 9729 9730 if (Invalid) 9731 ExDecl->setInvalidDecl(); 9732 9733 return ExDecl; 9734} 9735 9736/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9737/// handler. 9738Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9739 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9740 bool Invalid = D.isInvalidType(); 9741 9742 // Check for unexpanded parameter packs. 9743 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9744 UPPC_ExceptionType)) { 9745 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9746 D.getIdentifierLoc()); 9747 Invalid = true; 9748 } 9749 9750 IdentifierInfo *II = D.getIdentifier(); 9751 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9752 LookupOrdinaryName, 9753 ForRedeclaration)) { 9754 // The scope should be freshly made just for us. There is just no way 9755 // it contains any previous declaration. 9756 assert(!S->isDeclScope(PrevDecl)); 9757 if (PrevDecl->isTemplateParameter()) { 9758 // Maybe we will complain about the shadowed template parameter. 9759 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9760 PrevDecl = 0; 9761 } 9762 } 9763 9764 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9765 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9766 << D.getCXXScopeSpec().getRange(); 9767 Invalid = true; 9768 } 9769 9770 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9771 D.getLocStart(), 9772 D.getIdentifierLoc(), 9773 D.getIdentifier()); 9774 if (Invalid) 9775 ExDecl->setInvalidDecl(); 9776 9777 // Add the exception declaration into this scope. 9778 if (II) 9779 PushOnScopeChains(ExDecl, S); 9780 else 9781 CurContext->addDecl(ExDecl); 9782 9783 ProcessDeclAttributes(S, ExDecl, D); 9784 return ExDecl; 9785} 9786 9787Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9788 Expr *AssertExpr, 9789 Expr *AssertMessageExpr, 9790 SourceLocation RParenLoc) { 9791 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr); 9792 9793 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9794 return 0; 9795 9796 return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr, 9797 AssertMessage, RParenLoc, false); 9798} 9799 9800Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9801 Expr *AssertExpr, 9802 StringLiteral *AssertMessage, 9803 SourceLocation RParenLoc, 9804 bool Failed) { 9805 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() && 9806 !Failed) { 9807 // In a static_assert-declaration, the constant-expression shall be a 9808 // constant expression that can be contextually converted to bool. 9809 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 9810 if (Converted.isInvalid()) 9811 Failed = true; 9812 9813 llvm::APSInt Cond; 9814 if (!Failed && VerifyIntegerConstantExpression(Converted.get(), &Cond, 9815 diag::err_static_assert_expression_is_not_constant, 9816 /*AllowFold=*/false).isInvalid()) 9817 Failed = true; 9818 9819 if (!Failed && !Cond) { 9820 llvm::SmallString<256> MsgBuffer; 9821 llvm::raw_svector_ostream Msg(MsgBuffer); 9822 AssertMessage->printPretty(Msg, Context, 0, getPrintingPolicy()); 9823 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9824 << Msg.str() << AssertExpr->getSourceRange(); 9825 Failed = true; 9826 } 9827 } 9828 9829 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9830 AssertExpr, AssertMessage, RParenLoc, 9831 Failed); 9832 9833 CurContext->addDecl(Decl); 9834 return Decl; 9835} 9836 9837/// \brief Perform semantic analysis of the given friend type declaration. 9838/// 9839/// \returns A friend declaration that. 9840FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc, 9841 SourceLocation FriendLoc, 9842 TypeSourceInfo *TSInfo) { 9843 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9844 9845 QualType T = TSInfo->getType(); 9846 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9847 9848 // C++03 [class.friend]p2: 9849 // An elaborated-type-specifier shall be used in a friend declaration 9850 // for a class.* 9851 // 9852 // * The class-key of the elaborated-type-specifier is required. 9853 if (!ActiveTemplateInstantiations.empty()) { 9854 // Do not complain about the form of friend template types during 9855 // template instantiation; we will already have complained when the 9856 // template was declared. 9857 } else if (!T->isElaboratedTypeSpecifier()) { 9858 // If we evaluated the type to a record type, suggest putting 9859 // a tag in front. 9860 if (const RecordType *RT = T->getAs<RecordType>()) { 9861 RecordDecl *RD = RT->getDecl(); 9862 9863 std::string InsertionText = std::string(" ") + RD->getKindName(); 9864 9865 Diag(TypeRange.getBegin(), 9866 getLangOpts().CPlusPlus0x ? 9867 diag::warn_cxx98_compat_unelaborated_friend_type : 9868 diag::ext_unelaborated_friend_type) 9869 << (unsigned) RD->getTagKind() 9870 << T 9871 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9872 InsertionText); 9873 } else { 9874 Diag(FriendLoc, 9875 getLangOpts().CPlusPlus0x ? 9876 diag::warn_cxx98_compat_nonclass_type_friend : 9877 diag::ext_nonclass_type_friend) 9878 << T 9879 << SourceRange(FriendLoc, TypeRange.getEnd()); 9880 } 9881 } else if (T->getAs<EnumType>()) { 9882 Diag(FriendLoc, 9883 getLangOpts().CPlusPlus0x ? 9884 diag::warn_cxx98_compat_enum_friend : 9885 diag::ext_enum_friend) 9886 << T 9887 << SourceRange(FriendLoc, TypeRange.getEnd()); 9888 } 9889 9890 // C++0x [class.friend]p3: 9891 // If the type specifier in a friend declaration designates a (possibly 9892 // cv-qualified) class type, that class is declared as a friend; otherwise, 9893 // the friend declaration is ignored. 9894 9895 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9896 // in [class.friend]p3 that we do not implement. 9897 9898 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc); 9899} 9900 9901/// Handle a friend tag declaration where the scope specifier was 9902/// templated. 9903Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9904 unsigned TagSpec, SourceLocation TagLoc, 9905 CXXScopeSpec &SS, 9906 IdentifierInfo *Name, SourceLocation NameLoc, 9907 AttributeList *Attr, 9908 MultiTemplateParamsArg TempParamLists) { 9909 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9910 9911 bool isExplicitSpecialization = false; 9912 bool Invalid = false; 9913 9914 if (TemplateParameterList *TemplateParams 9915 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9916 TempParamLists.get(), 9917 TempParamLists.size(), 9918 /*friend*/ true, 9919 isExplicitSpecialization, 9920 Invalid)) { 9921 if (TemplateParams->size() > 0) { 9922 // This is a declaration of a class template. 9923 if (Invalid) 9924 return 0; 9925 9926 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9927 SS, Name, NameLoc, Attr, 9928 TemplateParams, AS_public, 9929 /*ModulePrivateLoc=*/SourceLocation(), 9930 TempParamLists.size() - 1, 9931 (TemplateParameterList**) TempParamLists.release()).take(); 9932 } else { 9933 // The "template<>" header is extraneous. 9934 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9935 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9936 isExplicitSpecialization = true; 9937 } 9938 } 9939 9940 if (Invalid) return 0; 9941 9942 bool isAllExplicitSpecializations = true; 9943 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9944 if (TempParamLists.get()[I]->size()) { 9945 isAllExplicitSpecializations = false; 9946 break; 9947 } 9948 } 9949 9950 // FIXME: don't ignore attributes. 9951 9952 // If it's explicit specializations all the way down, just forget 9953 // about the template header and build an appropriate non-templated 9954 // friend. TODO: for source fidelity, remember the headers. 9955 if (isAllExplicitSpecializations) { 9956 if (SS.isEmpty()) { 9957 bool Owned = false; 9958 bool IsDependent = false; 9959 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 9960 Attr, AS_public, 9961 /*ModulePrivateLoc=*/SourceLocation(), 9962 MultiTemplateParamsArg(), Owned, IsDependent, 9963 /*ScopedEnumKWLoc=*/SourceLocation(), 9964 /*ScopedEnumUsesClassTag=*/false, 9965 /*UnderlyingType=*/TypeResult()); 9966 } 9967 9968 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9969 ElaboratedTypeKeyword Keyword 9970 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9971 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9972 *Name, NameLoc); 9973 if (T.isNull()) 9974 return 0; 9975 9976 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9977 if (isa<DependentNameType>(T)) { 9978 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9979 TL.setElaboratedKeywordLoc(TagLoc); 9980 TL.setQualifierLoc(QualifierLoc); 9981 TL.setNameLoc(NameLoc); 9982 } else { 9983 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9984 TL.setElaboratedKeywordLoc(TagLoc); 9985 TL.setQualifierLoc(QualifierLoc); 9986 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 9987 } 9988 9989 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9990 TSI, FriendLoc); 9991 Friend->setAccess(AS_public); 9992 CurContext->addDecl(Friend); 9993 return Friend; 9994 } 9995 9996 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9997 9998 9999 10000 // Handle the case of a templated-scope friend class. e.g. 10001 // template <class T> class A<T>::B; 10002 // FIXME: we don't support these right now. 10003 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10004 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 10005 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10006 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10007 TL.setElaboratedKeywordLoc(TagLoc); 10008 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 10009 TL.setNameLoc(NameLoc); 10010 10011 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10012 TSI, FriendLoc); 10013 Friend->setAccess(AS_public); 10014 Friend->setUnsupportedFriend(true); 10015 CurContext->addDecl(Friend); 10016 return Friend; 10017} 10018 10019 10020/// Handle a friend type declaration. This works in tandem with 10021/// ActOnTag. 10022/// 10023/// Notes on friend class templates: 10024/// 10025/// We generally treat friend class declarations as if they were 10026/// declaring a class. So, for example, the elaborated type specifier 10027/// in a friend declaration is required to obey the restrictions of a 10028/// class-head (i.e. no typedefs in the scope chain), template 10029/// parameters are required to match up with simple template-ids, &c. 10030/// However, unlike when declaring a template specialization, it's 10031/// okay to refer to a template specialization without an empty 10032/// template parameter declaration, e.g. 10033/// friend class A<T>::B<unsigned>; 10034/// We permit this as a special case; if there are any template 10035/// parameters present at all, require proper matching, i.e. 10036/// template <> template \<class T> friend class A<int>::B; 10037Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 10038 MultiTemplateParamsArg TempParams) { 10039 SourceLocation Loc = DS.getLocStart(); 10040 10041 assert(DS.isFriendSpecified()); 10042 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10043 10044 // Try to convert the decl specifier to a type. This works for 10045 // friend templates because ActOnTag never produces a ClassTemplateDecl 10046 // for a TUK_Friend. 10047 Declarator TheDeclarator(DS, Declarator::MemberContext); 10048 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 10049 QualType T = TSI->getType(); 10050 if (TheDeclarator.isInvalidType()) 10051 return 0; 10052 10053 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 10054 return 0; 10055 10056 // This is definitely an error in C++98. It's probably meant to 10057 // be forbidden in C++0x, too, but the specification is just 10058 // poorly written. 10059 // 10060 // The problem is with declarations like the following: 10061 // template <T> friend A<T>::foo; 10062 // where deciding whether a class C is a friend or not now hinges 10063 // on whether there exists an instantiation of A that causes 10064 // 'foo' to equal C. There are restrictions on class-heads 10065 // (which we declare (by fiat) elaborated friend declarations to 10066 // be) that makes this tractable. 10067 // 10068 // FIXME: handle "template <> friend class A<T>;", which 10069 // is possibly well-formed? Who even knows? 10070 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 10071 Diag(Loc, diag::err_tagless_friend_type_template) 10072 << DS.getSourceRange(); 10073 return 0; 10074 } 10075 10076 // C++98 [class.friend]p1: A friend of a class is a function 10077 // or class that is not a member of the class . . . 10078 // This is fixed in DR77, which just barely didn't make the C++03 10079 // deadline. It's also a very silly restriction that seriously 10080 // affects inner classes and which nobody else seems to implement; 10081 // thus we never diagnose it, not even in -pedantic. 10082 // 10083 // But note that we could warn about it: it's always useless to 10084 // friend one of your own members (it's not, however, worthless to 10085 // friend a member of an arbitrary specialization of your template). 10086 10087 Decl *D; 10088 if (unsigned NumTempParamLists = TempParams.size()) 10089 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10090 NumTempParamLists, 10091 TempParams.release(), 10092 TSI, 10093 DS.getFriendSpecLoc()); 10094 else 10095 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 10096 10097 if (!D) 10098 return 0; 10099 10100 D->setAccess(AS_public); 10101 CurContext->addDecl(D); 10102 10103 return D; 10104} 10105 10106Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 10107 MultiTemplateParamsArg TemplateParams) { 10108 const DeclSpec &DS = D.getDeclSpec(); 10109 10110 assert(DS.isFriendSpecified()); 10111 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10112 10113 SourceLocation Loc = D.getIdentifierLoc(); 10114 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10115 10116 // C++ [class.friend]p1 10117 // A friend of a class is a function or class.... 10118 // Note that this sees through typedefs, which is intended. 10119 // It *doesn't* see through dependent types, which is correct 10120 // according to [temp.arg.type]p3: 10121 // If a declaration acquires a function type through a 10122 // type dependent on a template-parameter and this causes 10123 // a declaration that does not use the syntactic form of a 10124 // function declarator to have a function type, the program 10125 // is ill-formed. 10126 if (!TInfo->getType()->isFunctionType()) { 10127 Diag(Loc, diag::err_unexpected_friend); 10128 10129 // It might be worthwhile to try to recover by creating an 10130 // appropriate declaration. 10131 return 0; 10132 } 10133 10134 // C++ [namespace.memdef]p3 10135 // - If a friend declaration in a non-local class first declares a 10136 // class or function, the friend class or function is a member 10137 // of the innermost enclosing namespace. 10138 // - The name of the friend is not found by simple name lookup 10139 // until a matching declaration is provided in that namespace 10140 // scope (either before or after the class declaration granting 10141 // friendship). 10142 // - If a friend function is called, its name may be found by the 10143 // name lookup that considers functions from namespaces and 10144 // classes associated with the types of the function arguments. 10145 // - When looking for a prior declaration of a class or a function 10146 // declared as a friend, scopes outside the innermost enclosing 10147 // namespace scope are not considered. 10148 10149 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10150 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10151 DeclarationName Name = NameInfo.getName(); 10152 assert(Name); 10153 10154 // Check for unexpanded parameter packs. 10155 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10156 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10157 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10158 return 0; 10159 10160 // The context we found the declaration in, or in which we should 10161 // create the declaration. 10162 DeclContext *DC; 10163 Scope *DCScope = S; 10164 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10165 ForRedeclaration); 10166 10167 // FIXME: there are different rules in local classes 10168 10169 // There are four cases here. 10170 // - There's no scope specifier, in which case we just go to the 10171 // appropriate scope and look for a function or function template 10172 // there as appropriate. 10173 // Recover from invalid scope qualifiers as if they just weren't there. 10174 if (SS.isInvalid() || !SS.isSet()) { 10175 // C++0x [namespace.memdef]p3: 10176 // If the name in a friend declaration is neither qualified nor 10177 // a template-id and the declaration is a function or an 10178 // elaborated-type-specifier, the lookup to determine whether 10179 // the entity has been previously declared shall not consider 10180 // any scopes outside the innermost enclosing namespace. 10181 // C++0x [class.friend]p11: 10182 // If a friend declaration appears in a local class and the name 10183 // specified is an unqualified name, a prior declaration is 10184 // looked up without considering scopes that are outside the 10185 // innermost enclosing non-class scope. For a friend function 10186 // declaration, if there is no prior declaration, the program is 10187 // ill-formed. 10188 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10189 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10190 10191 // Find the appropriate context according to the above. 10192 DC = CurContext; 10193 while (true) { 10194 // Skip class contexts. If someone can cite chapter and verse 10195 // for this behavior, that would be nice --- it's what GCC and 10196 // EDG do, and it seems like a reasonable intent, but the spec 10197 // really only says that checks for unqualified existing 10198 // declarations should stop at the nearest enclosing namespace, 10199 // not that they should only consider the nearest enclosing 10200 // namespace. 10201 while (DC->isRecord() || DC->isTransparentContext()) 10202 DC = DC->getParent(); 10203 10204 LookupQualifiedName(Previous, DC); 10205 10206 // TODO: decide what we think about using declarations. 10207 if (isLocal || !Previous.empty()) 10208 break; 10209 10210 if (isTemplateId) { 10211 if (isa<TranslationUnitDecl>(DC)) break; 10212 } else { 10213 if (DC->isFileContext()) break; 10214 } 10215 DC = DC->getParent(); 10216 } 10217 10218 // C++ [class.friend]p1: A friend of a class is a function or 10219 // class that is not a member of the class . . . 10220 // C++11 changes this for both friend types and functions. 10221 // Most C++ 98 compilers do seem to give an error here, so 10222 // we do, too. 10223 if (!Previous.empty() && DC->Equals(CurContext)) 10224 Diag(DS.getFriendSpecLoc(), 10225 getLangOpts().CPlusPlus0x ? 10226 diag::warn_cxx98_compat_friend_is_member : 10227 diag::err_friend_is_member); 10228 10229 DCScope = getScopeForDeclContext(S, DC); 10230 10231 // C++ [class.friend]p6: 10232 // A function can be defined in a friend declaration of a class if and 10233 // only if the class is a non-local class (9.8), the function name is 10234 // unqualified, and the function has namespace scope. 10235 if (isLocal && D.isFunctionDefinition()) { 10236 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10237 } 10238 10239 // - There's a non-dependent scope specifier, in which case we 10240 // compute it and do a previous lookup there for a function 10241 // or function template. 10242 } else if (!SS.getScopeRep()->isDependent()) { 10243 DC = computeDeclContext(SS); 10244 if (!DC) return 0; 10245 10246 if (RequireCompleteDeclContext(SS, DC)) return 0; 10247 10248 LookupQualifiedName(Previous, DC); 10249 10250 // Ignore things found implicitly in the wrong scope. 10251 // TODO: better diagnostics for this case. Suggesting the right 10252 // qualified scope would be nice... 10253 LookupResult::Filter F = Previous.makeFilter(); 10254 while (F.hasNext()) { 10255 NamedDecl *D = F.next(); 10256 if (!DC->InEnclosingNamespaceSetOf( 10257 D->getDeclContext()->getRedeclContext())) 10258 F.erase(); 10259 } 10260 F.done(); 10261 10262 if (Previous.empty()) { 10263 D.setInvalidType(); 10264 Diag(Loc, diag::err_qualified_friend_not_found) 10265 << Name << TInfo->getType(); 10266 return 0; 10267 } 10268 10269 // C++ [class.friend]p1: A friend of a class is a function or 10270 // class that is not a member of the class . . . 10271 if (DC->Equals(CurContext)) 10272 Diag(DS.getFriendSpecLoc(), 10273 getLangOpts().CPlusPlus0x ? 10274 diag::warn_cxx98_compat_friend_is_member : 10275 diag::err_friend_is_member); 10276 10277 if (D.isFunctionDefinition()) { 10278 // C++ [class.friend]p6: 10279 // A function can be defined in a friend declaration of a class if and 10280 // only if the class is a non-local class (9.8), the function name is 10281 // unqualified, and the function has namespace scope. 10282 SemaDiagnosticBuilder DB 10283 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10284 10285 DB << SS.getScopeRep(); 10286 if (DC->isFileContext()) 10287 DB << FixItHint::CreateRemoval(SS.getRange()); 10288 SS.clear(); 10289 } 10290 10291 // - There's a scope specifier that does not match any template 10292 // parameter lists, in which case we use some arbitrary context, 10293 // create a method or method template, and wait for instantiation. 10294 // - There's a scope specifier that does match some template 10295 // parameter lists, which we don't handle right now. 10296 } else { 10297 if (D.isFunctionDefinition()) { 10298 // C++ [class.friend]p6: 10299 // A function can be defined in a friend declaration of a class if and 10300 // only if the class is a non-local class (9.8), the function name is 10301 // unqualified, and the function has namespace scope. 10302 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10303 << SS.getScopeRep(); 10304 } 10305 10306 DC = CurContext; 10307 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10308 } 10309 10310 if (!DC->isRecord()) { 10311 // This implies that it has to be an operator or function. 10312 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10313 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10314 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10315 Diag(Loc, diag::err_introducing_special_friend) << 10316 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10317 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10318 return 0; 10319 } 10320 } 10321 10322 // FIXME: This is an egregious hack to cope with cases where the scope stack 10323 // does not contain the declaration context, i.e., in an out-of-line 10324 // definition of a class. 10325 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10326 if (!DCScope) { 10327 FakeDCScope.setEntity(DC); 10328 DCScope = &FakeDCScope; 10329 } 10330 10331 bool AddToScope = true; 10332 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10333 move(TemplateParams), AddToScope); 10334 if (!ND) return 0; 10335 10336 assert(ND->getDeclContext() == DC); 10337 assert(ND->getLexicalDeclContext() == CurContext); 10338 10339 // Add the function declaration to the appropriate lookup tables, 10340 // adjusting the redeclarations list as necessary. We don't 10341 // want to do this yet if the friending class is dependent. 10342 // 10343 // Also update the scope-based lookup if the target context's 10344 // lookup context is in lexical scope. 10345 if (!CurContext->isDependentContext()) { 10346 DC = DC->getRedeclContext(); 10347 DC->makeDeclVisibleInContext(ND); 10348 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10349 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10350 } 10351 10352 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10353 D.getIdentifierLoc(), ND, 10354 DS.getFriendSpecLoc()); 10355 FrD->setAccess(AS_public); 10356 CurContext->addDecl(FrD); 10357 10358 if (ND->isInvalidDecl()) 10359 FrD->setInvalidDecl(); 10360 else { 10361 FunctionDecl *FD; 10362 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10363 FD = FTD->getTemplatedDecl(); 10364 else 10365 FD = cast<FunctionDecl>(ND); 10366 10367 // Mark templated-scope function declarations as unsupported. 10368 if (FD->getNumTemplateParameterLists()) 10369 FrD->setUnsupportedFriend(true); 10370 } 10371 10372 return ND; 10373} 10374 10375void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10376 AdjustDeclIfTemplate(Dcl); 10377 10378 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10379 if (!Fn) { 10380 Diag(DelLoc, diag::err_deleted_non_function); 10381 return; 10382 } 10383 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10384 // Don't consider the implicit declaration we generate for explicit 10385 // specializations. FIXME: Do not generate these implicit declarations. 10386 if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization 10387 || Prev->getPreviousDecl()) && !Prev->isDefined()) { 10388 Diag(DelLoc, diag::err_deleted_decl_not_first); 10389 Diag(Prev->getLocation(), diag::note_previous_declaration); 10390 } 10391 // If the declaration wasn't the first, we delete the function anyway for 10392 // recovery. 10393 } 10394 Fn->setDeletedAsWritten(); 10395 10396 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10397 if (!MD) 10398 return; 10399 10400 // A deleted special member function is trivial if the corresponding 10401 // implicitly-declared function would have been. 10402 switch (getSpecialMember(MD)) { 10403 case CXXInvalid: 10404 break; 10405 case CXXDefaultConstructor: 10406 MD->setTrivial(MD->getParent()->hasTrivialDefaultConstructor()); 10407 break; 10408 case CXXCopyConstructor: 10409 MD->setTrivial(MD->getParent()->hasTrivialCopyConstructor()); 10410 break; 10411 case CXXMoveConstructor: 10412 MD->setTrivial(MD->getParent()->hasTrivialMoveConstructor()); 10413 break; 10414 case CXXCopyAssignment: 10415 MD->setTrivial(MD->getParent()->hasTrivialCopyAssignment()); 10416 break; 10417 case CXXMoveAssignment: 10418 MD->setTrivial(MD->getParent()->hasTrivialMoveAssignment()); 10419 break; 10420 case CXXDestructor: 10421 MD->setTrivial(MD->getParent()->hasTrivialDestructor()); 10422 break; 10423 } 10424} 10425 10426void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10427 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10428 10429 if (MD) { 10430 if (MD->getParent()->isDependentType()) { 10431 MD->setDefaulted(); 10432 MD->setExplicitlyDefaulted(); 10433 return; 10434 } 10435 10436 CXXSpecialMember Member = getSpecialMember(MD); 10437 if (Member == CXXInvalid) { 10438 Diag(DefaultLoc, diag::err_default_special_members); 10439 return; 10440 } 10441 10442 MD->setDefaulted(); 10443 MD->setExplicitlyDefaulted(); 10444 10445 // If this definition appears within the record, do the checking when 10446 // the record is complete. 10447 const FunctionDecl *Primary = MD; 10448 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10449 // Find the uninstantiated declaration that actually had the '= default' 10450 // on it. 10451 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10452 10453 if (Primary == Primary->getCanonicalDecl()) 10454 return; 10455 10456 CheckExplicitlyDefaultedSpecialMember(MD); 10457 10458 switch (Member) { 10459 case CXXDefaultConstructor: { 10460 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10461 if (!CD->isInvalidDecl()) 10462 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10463 break; 10464 } 10465 10466 case CXXCopyConstructor: { 10467 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10468 if (!CD->isInvalidDecl()) 10469 DefineImplicitCopyConstructor(DefaultLoc, CD); 10470 break; 10471 } 10472 10473 case CXXCopyAssignment: { 10474 if (!MD->isInvalidDecl()) 10475 DefineImplicitCopyAssignment(DefaultLoc, MD); 10476 break; 10477 } 10478 10479 case CXXDestructor: { 10480 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10481 if (!DD->isInvalidDecl()) 10482 DefineImplicitDestructor(DefaultLoc, DD); 10483 break; 10484 } 10485 10486 case CXXMoveConstructor: { 10487 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10488 if (!CD->isInvalidDecl()) 10489 DefineImplicitMoveConstructor(DefaultLoc, CD); 10490 break; 10491 } 10492 10493 case CXXMoveAssignment: { 10494 if (!MD->isInvalidDecl()) 10495 DefineImplicitMoveAssignment(DefaultLoc, MD); 10496 break; 10497 } 10498 10499 case CXXInvalid: 10500 llvm_unreachable("Invalid special member."); 10501 } 10502 } else { 10503 Diag(DefaultLoc, diag::err_default_special_members); 10504 } 10505} 10506 10507static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10508 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10509 Stmt *SubStmt = *CI; 10510 if (!SubStmt) 10511 continue; 10512 if (isa<ReturnStmt>(SubStmt)) 10513 Self.Diag(SubStmt->getLocStart(), 10514 diag::err_return_in_constructor_handler); 10515 if (!isa<Expr>(SubStmt)) 10516 SearchForReturnInStmt(Self, SubStmt); 10517 } 10518} 10519 10520void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10521 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10522 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10523 SearchForReturnInStmt(*this, Handler); 10524 } 10525} 10526 10527bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10528 const CXXMethodDecl *Old) { 10529 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10530 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10531 10532 if (Context.hasSameType(NewTy, OldTy) || 10533 NewTy->isDependentType() || OldTy->isDependentType()) 10534 return false; 10535 10536 // Check if the return types are covariant 10537 QualType NewClassTy, OldClassTy; 10538 10539 /// Both types must be pointers or references to classes. 10540 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10541 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10542 NewClassTy = NewPT->getPointeeType(); 10543 OldClassTy = OldPT->getPointeeType(); 10544 } 10545 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10546 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10547 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10548 NewClassTy = NewRT->getPointeeType(); 10549 OldClassTy = OldRT->getPointeeType(); 10550 } 10551 } 10552 } 10553 10554 // The return types aren't either both pointers or references to a class type. 10555 if (NewClassTy.isNull()) { 10556 Diag(New->getLocation(), 10557 diag::err_different_return_type_for_overriding_virtual_function) 10558 << New->getDeclName() << NewTy << OldTy; 10559 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10560 10561 return true; 10562 } 10563 10564 // C++ [class.virtual]p6: 10565 // If the return type of D::f differs from the return type of B::f, the 10566 // class type in the return type of D::f shall be complete at the point of 10567 // declaration of D::f or shall be the class type D. 10568 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10569 if (!RT->isBeingDefined() && 10570 RequireCompleteType(New->getLocation(), NewClassTy, 10571 diag::err_covariant_return_incomplete, 10572 New->getDeclName())) 10573 return true; 10574 } 10575 10576 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10577 // Check if the new class derives from the old class. 10578 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10579 Diag(New->getLocation(), 10580 diag::err_covariant_return_not_derived) 10581 << New->getDeclName() << NewTy << OldTy; 10582 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10583 return true; 10584 } 10585 10586 // Check if we the conversion from derived to base is valid. 10587 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10588 diag::err_covariant_return_inaccessible_base, 10589 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10590 // FIXME: Should this point to the return type? 10591 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10592 // FIXME: this note won't trigger for delayed access control 10593 // diagnostics, and it's impossible to get an undelayed error 10594 // here from access control during the original parse because 10595 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10596 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10597 return true; 10598 } 10599 } 10600 10601 // The qualifiers of the return types must be the same. 10602 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10603 Diag(New->getLocation(), 10604 diag::err_covariant_return_type_different_qualifications) 10605 << New->getDeclName() << NewTy << OldTy; 10606 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10607 return true; 10608 }; 10609 10610 10611 // The new class type must have the same or less qualifiers as the old type. 10612 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10613 Diag(New->getLocation(), 10614 diag::err_covariant_return_type_class_type_more_qualified) 10615 << New->getDeclName() << NewTy << OldTy; 10616 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10617 return true; 10618 }; 10619 10620 return false; 10621} 10622 10623/// \brief Mark the given method pure. 10624/// 10625/// \param Method the method to be marked pure. 10626/// 10627/// \param InitRange the source range that covers the "0" initializer. 10628bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10629 SourceLocation EndLoc = InitRange.getEnd(); 10630 if (EndLoc.isValid()) 10631 Method->setRangeEnd(EndLoc); 10632 10633 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10634 Method->setPure(); 10635 return false; 10636 } 10637 10638 if (!Method->isInvalidDecl()) 10639 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10640 << Method->getDeclName() << InitRange; 10641 return true; 10642} 10643 10644/// \brief Determine whether the given declaration is a static data member. 10645static bool isStaticDataMember(Decl *D) { 10646 VarDecl *Var = dyn_cast_or_null<VarDecl>(D); 10647 if (!Var) 10648 return false; 10649 10650 return Var->isStaticDataMember(); 10651} 10652/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10653/// an initializer for the out-of-line declaration 'Dcl'. The scope 10654/// is a fresh scope pushed for just this purpose. 10655/// 10656/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10657/// static data member of class X, names should be looked up in the scope of 10658/// class X. 10659void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10660 // If there is no declaration, there was an error parsing it. 10661 if (D == 0 || D->isInvalidDecl()) return; 10662 10663 // We should only get called for declarations with scope specifiers, like: 10664 // int foo::bar; 10665 assert(D->isOutOfLine()); 10666 EnterDeclaratorContext(S, D->getDeclContext()); 10667 10668 // If we are parsing the initializer for a static data member, push a 10669 // new expression evaluation context that is associated with this static 10670 // data member. 10671 if (isStaticDataMember(D)) 10672 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 10673} 10674 10675/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10676/// initializer for the out-of-line declaration 'D'. 10677void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10678 // If there is no declaration, there was an error parsing it. 10679 if (D == 0 || D->isInvalidDecl()) return; 10680 10681 if (isStaticDataMember(D)) 10682 PopExpressionEvaluationContext(); 10683 10684 assert(D->isOutOfLine()); 10685 ExitDeclaratorContext(S); 10686} 10687 10688/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10689/// C++ if/switch/while/for statement. 10690/// e.g: "if (int x = f()) {...}" 10691DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10692 // C++ 6.4p2: 10693 // The declarator shall not specify a function or an array. 10694 // The type-specifier-seq shall not contain typedef and shall not declare a 10695 // new class or enumeration. 10696 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10697 "Parser allowed 'typedef' as storage class of condition decl."); 10698 10699 Decl *Dcl = ActOnDeclarator(S, D); 10700 if (!Dcl) 10701 return true; 10702 10703 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10704 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10705 << D.getSourceRange(); 10706 return true; 10707 } 10708 10709 return Dcl; 10710} 10711 10712void Sema::LoadExternalVTableUses() { 10713 if (!ExternalSource) 10714 return; 10715 10716 SmallVector<ExternalVTableUse, 4> VTables; 10717 ExternalSource->ReadUsedVTables(VTables); 10718 SmallVector<VTableUse, 4> NewUses; 10719 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10720 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10721 = VTablesUsed.find(VTables[I].Record); 10722 // Even if a definition wasn't required before, it may be required now. 10723 if (Pos != VTablesUsed.end()) { 10724 if (!Pos->second && VTables[I].DefinitionRequired) 10725 Pos->second = true; 10726 continue; 10727 } 10728 10729 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10730 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10731 } 10732 10733 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10734} 10735 10736void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10737 bool DefinitionRequired) { 10738 // Ignore any vtable uses in unevaluated operands or for classes that do 10739 // not have a vtable. 10740 if (!Class->isDynamicClass() || Class->isDependentContext() || 10741 CurContext->isDependentContext() || 10742 ExprEvalContexts.back().Context == Unevaluated) 10743 return; 10744 10745 // Try to insert this class into the map. 10746 LoadExternalVTableUses(); 10747 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10748 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10749 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10750 if (!Pos.second) { 10751 // If we already had an entry, check to see if we are promoting this vtable 10752 // to required a definition. If so, we need to reappend to the VTableUses 10753 // list, since we may have already processed the first entry. 10754 if (DefinitionRequired && !Pos.first->second) { 10755 Pos.first->second = true; 10756 } else { 10757 // Otherwise, we can early exit. 10758 return; 10759 } 10760 } 10761 10762 // Local classes need to have their virtual members marked 10763 // immediately. For all other classes, we mark their virtual members 10764 // at the end of the translation unit. 10765 if (Class->isLocalClass()) 10766 MarkVirtualMembersReferenced(Loc, Class); 10767 else 10768 VTableUses.push_back(std::make_pair(Class, Loc)); 10769} 10770 10771bool Sema::DefineUsedVTables() { 10772 LoadExternalVTableUses(); 10773 if (VTableUses.empty()) 10774 return false; 10775 10776 // Note: The VTableUses vector could grow as a result of marking 10777 // the members of a class as "used", so we check the size each 10778 // time through the loop and prefer indices (which are stable) to 10779 // iterators (which are not). 10780 bool DefinedAnything = false; 10781 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10782 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10783 if (!Class) 10784 continue; 10785 10786 SourceLocation Loc = VTableUses[I].second; 10787 10788 bool DefineVTable = true; 10789 10790 // If this class has a key function, but that key function is 10791 // defined in another translation unit, we don't need to emit the 10792 // vtable even though we're using it. 10793 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10794 if (KeyFunction && !KeyFunction->hasBody()) { 10795 switch (KeyFunction->getTemplateSpecializationKind()) { 10796 case TSK_Undeclared: 10797 case TSK_ExplicitSpecialization: 10798 case TSK_ExplicitInstantiationDeclaration: 10799 // The key function is in another translation unit. 10800 DefineVTable = false; 10801 break; 10802 10803 case TSK_ExplicitInstantiationDefinition: 10804 case TSK_ImplicitInstantiation: 10805 // We will be instantiating the key function. 10806 break; 10807 } 10808 } else if (!KeyFunction) { 10809 // If we have a class with no key function that is the subject 10810 // of an explicit instantiation declaration, suppress the 10811 // vtable; it will live with the explicit instantiation 10812 // definition. 10813 bool IsExplicitInstantiationDeclaration 10814 = Class->getTemplateSpecializationKind() 10815 == TSK_ExplicitInstantiationDeclaration; 10816 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10817 REnd = Class->redecls_end(); 10818 R != REnd; ++R) { 10819 TemplateSpecializationKind TSK 10820 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10821 if (TSK == TSK_ExplicitInstantiationDeclaration) 10822 IsExplicitInstantiationDeclaration = true; 10823 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10824 IsExplicitInstantiationDeclaration = false; 10825 break; 10826 } 10827 } 10828 10829 if (IsExplicitInstantiationDeclaration) 10830 DefineVTable = false; 10831 } 10832 10833 // The exception specifications for all virtual members may be needed even 10834 // if we are not providing an authoritative form of the vtable in this TU. 10835 // We may choose to emit it available_externally anyway. 10836 if (!DefineVTable) { 10837 MarkVirtualMemberExceptionSpecsNeeded(Loc, Class); 10838 continue; 10839 } 10840 10841 // Mark all of the virtual members of this class as referenced, so 10842 // that we can build a vtable. Then, tell the AST consumer that a 10843 // vtable for this class is required. 10844 DefinedAnything = true; 10845 MarkVirtualMembersReferenced(Loc, Class); 10846 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10847 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10848 10849 // Optionally warn if we're emitting a weak vtable. 10850 if (Class->getLinkage() == ExternalLinkage && 10851 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10852 const FunctionDecl *KeyFunctionDef = 0; 10853 if (!KeyFunction || 10854 (KeyFunction->hasBody(KeyFunctionDef) && 10855 KeyFunctionDef->isInlined())) 10856 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10857 TSK_ExplicitInstantiationDefinition 10858 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10859 << Class; 10860 } 10861 } 10862 VTableUses.clear(); 10863 10864 return DefinedAnything; 10865} 10866 10867void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc, 10868 const CXXRecordDecl *RD) { 10869 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 10870 E = RD->method_end(); I != E; ++I) 10871 if ((*I)->isVirtual() && !(*I)->isPure()) 10872 ResolveExceptionSpec(Loc, (*I)->getType()->castAs<FunctionProtoType>()); 10873} 10874 10875void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10876 const CXXRecordDecl *RD) { 10877 // Mark all functions which will appear in RD's vtable as used. 10878 CXXFinalOverriderMap FinalOverriders; 10879 RD->getFinalOverriders(FinalOverriders); 10880 for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(), 10881 E = FinalOverriders.end(); 10882 I != E; ++I) { 10883 for (OverridingMethods::const_iterator OI = I->second.begin(), 10884 OE = I->second.end(); 10885 OI != OE; ++OI) { 10886 assert(OI->second.size() > 0 && "no final overrider"); 10887 CXXMethodDecl *Overrider = OI->second.front().Method; 10888 10889 // C++ [basic.def.odr]p2: 10890 // [...] A virtual member function is used if it is not pure. [...] 10891 if (!Overrider->isPure()) 10892 MarkFunctionReferenced(Loc, Overrider); 10893 } 10894 } 10895 10896 // Only classes that have virtual bases need a VTT. 10897 if (RD->getNumVBases() == 0) 10898 return; 10899 10900 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10901 e = RD->bases_end(); i != e; ++i) { 10902 const CXXRecordDecl *Base = 10903 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10904 if (Base->getNumVBases() == 0) 10905 continue; 10906 MarkVirtualMembersReferenced(Loc, Base); 10907 } 10908} 10909 10910/// SetIvarInitializers - This routine builds initialization ASTs for the 10911/// Objective-C implementation whose ivars need be initialized. 10912void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10913 if (!getLangOpts().CPlusPlus) 10914 return; 10915 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10916 SmallVector<ObjCIvarDecl*, 8> ivars; 10917 CollectIvarsToConstructOrDestruct(OID, ivars); 10918 if (ivars.empty()) 10919 return; 10920 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10921 for (unsigned i = 0; i < ivars.size(); i++) { 10922 FieldDecl *Field = ivars[i]; 10923 if (Field->isInvalidDecl()) 10924 continue; 10925 10926 CXXCtorInitializer *Member; 10927 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10928 InitializationKind InitKind = 10929 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10930 10931 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10932 ExprResult MemberInit = 10933 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10934 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10935 // Note, MemberInit could actually come back empty if no initialization 10936 // is required (e.g., because it would call a trivial default constructor) 10937 if (!MemberInit.get() || MemberInit.isInvalid()) 10938 continue; 10939 10940 Member = 10941 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10942 SourceLocation(), 10943 MemberInit.takeAs<Expr>(), 10944 SourceLocation()); 10945 AllToInit.push_back(Member); 10946 10947 // Be sure that the destructor is accessible and is marked as referenced. 10948 if (const RecordType *RecordTy 10949 = Context.getBaseElementType(Field->getType()) 10950 ->getAs<RecordType>()) { 10951 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10952 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10953 MarkFunctionReferenced(Field->getLocation(), Destructor); 10954 CheckDestructorAccess(Field->getLocation(), Destructor, 10955 PDiag(diag::err_access_dtor_ivar) 10956 << Context.getBaseElementType(Field->getType())); 10957 } 10958 } 10959 } 10960 ObjCImplementation->setIvarInitializers(Context, 10961 AllToInit.data(), AllToInit.size()); 10962 } 10963} 10964 10965static 10966void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10967 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10968 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10969 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10970 Sema &S) { 10971 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10972 CE = Current.end(); 10973 if (Ctor->isInvalidDecl()) 10974 return; 10975 10976 const FunctionDecl *FNTarget = 0; 10977 CXXConstructorDecl *Target; 10978 10979 // We ignore the result here since if we don't have a body, Target will be 10980 // null below. 10981 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10982 Target 10983= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10984 10985 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10986 // Avoid dereferencing a null pointer here. 10987 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10988 10989 if (!Current.insert(Canonical)) 10990 return; 10991 10992 // We know that beyond here, we aren't chaining into a cycle. 10993 if (!Target || !Target->isDelegatingConstructor() || 10994 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10995 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10996 Valid.insert(*CI); 10997 Current.clear(); 10998 // We've hit a cycle. 10999 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 11000 Current.count(TCanonical)) { 11001 // If we haven't diagnosed this cycle yet, do so now. 11002 if (!Invalid.count(TCanonical)) { 11003 S.Diag((*Ctor->init_begin())->getSourceLocation(), 11004 diag::warn_delegating_ctor_cycle) 11005 << Ctor; 11006 11007 // Don't add a note for a function delegating directo to itself. 11008 if (TCanonical != Canonical) 11009 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 11010 11011 CXXConstructorDecl *C = Target; 11012 while (C->getCanonicalDecl() != Canonical) { 11013 (void)C->getTargetConstructor()->hasBody(FNTarget); 11014 assert(FNTarget && "Ctor cycle through bodiless function"); 11015 11016 C 11017 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 11018 S.Diag(C->getLocation(), diag::note_which_delegates_to); 11019 } 11020 } 11021 11022 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11023 Invalid.insert(*CI); 11024 Current.clear(); 11025 } else { 11026 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 11027 } 11028} 11029 11030 11031void Sema::CheckDelegatingCtorCycles() { 11032 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 11033 11034 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11035 CE = Current.end(); 11036 11037 for (DelegatingCtorDeclsType::iterator 11038 I = DelegatingCtorDecls.begin(ExternalSource), 11039 E = DelegatingCtorDecls.end(); 11040 I != E; ++I) { 11041 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 11042 } 11043 11044 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 11045 (*CI)->setInvalidDecl(); 11046} 11047 11048namespace { 11049 /// \brief AST visitor that finds references to the 'this' expression. 11050 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { 11051 Sema &S; 11052 11053 public: 11054 explicit FindCXXThisExpr(Sema &S) : S(S) { } 11055 11056 bool VisitCXXThisExpr(CXXThisExpr *E) { 11057 S.Diag(E->getLocation(), diag::err_this_static_member_func) 11058 << E->isImplicit(); 11059 return false; 11060 } 11061 }; 11062} 11063 11064bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { 11065 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11066 if (!TSInfo) 11067 return false; 11068 11069 TypeLoc TL = TSInfo->getTypeLoc(); 11070 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11071 if (!ProtoTL) 11072 return false; 11073 11074 // C++11 [expr.prim.general]p3: 11075 // [The expression this] shall not appear before the optional 11076 // cv-qualifier-seq and it shall not appear within the declaration of a 11077 // static member function (although its type and value category are defined 11078 // within a static member function as they are within a non-static member 11079 // function). [ Note: this is because declaration matching does not occur 11080 // until the complete declarator is known. - end note ] 11081 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11082 FindCXXThisExpr Finder(*this); 11083 11084 // If the return type came after the cv-qualifier-seq, check it now. 11085 if (Proto->hasTrailingReturn() && 11086 !Finder.TraverseTypeLoc(ProtoTL->getResultLoc())) 11087 return true; 11088 11089 // Check the exception specification. 11090 if (checkThisInStaticMemberFunctionExceptionSpec(Method)) 11091 return true; 11092 11093 return checkThisInStaticMemberFunctionAttributes(Method); 11094} 11095 11096bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { 11097 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11098 if (!TSInfo) 11099 return false; 11100 11101 TypeLoc TL = TSInfo->getTypeLoc(); 11102 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11103 if (!ProtoTL) 11104 return false; 11105 11106 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11107 FindCXXThisExpr Finder(*this); 11108 11109 switch (Proto->getExceptionSpecType()) { 11110 case EST_Uninstantiated: 11111 case EST_Unevaluated: 11112 case EST_BasicNoexcept: 11113 case EST_DynamicNone: 11114 case EST_MSAny: 11115 case EST_None: 11116 break; 11117 11118 case EST_ComputedNoexcept: 11119 if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) 11120 return true; 11121 11122 case EST_Dynamic: 11123 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 11124 EEnd = Proto->exception_end(); 11125 E != EEnd; ++E) { 11126 if (!Finder.TraverseType(*E)) 11127 return true; 11128 } 11129 break; 11130 } 11131 11132 return false; 11133} 11134 11135bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { 11136 FindCXXThisExpr Finder(*this); 11137 11138 // Check attributes. 11139 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end(); 11140 A != AEnd; ++A) { 11141 // FIXME: This should be emitted by tblgen. 11142 Expr *Arg = 0; 11143 ArrayRef<Expr *> Args; 11144 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A)) 11145 Arg = G->getArg(); 11146 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A)) 11147 Arg = G->getArg(); 11148 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A)) 11149 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size()); 11150 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A)) 11151 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size()); 11152 else if (ExclusiveLockFunctionAttr *ELF 11153 = dyn_cast<ExclusiveLockFunctionAttr>(*A)) 11154 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size()); 11155 else if (SharedLockFunctionAttr *SLF 11156 = dyn_cast<SharedLockFunctionAttr>(*A)) 11157 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size()); 11158 else if (ExclusiveTrylockFunctionAttr *ETLF 11159 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) { 11160 Arg = ETLF->getSuccessValue(); 11161 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size()); 11162 } else if (SharedTrylockFunctionAttr *STLF 11163 = dyn_cast<SharedTrylockFunctionAttr>(*A)) { 11164 Arg = STLF->getSuccessValue(); 11165 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size()); 11166 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A)) 11167 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size()); 11168 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A)) 11169 Arg = LR->getArg(); 11170 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A)) 11171 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size()); 11172 else if (ExclusiveLocksRequiredAttr *ELR 11173 = dyn_cast<ExclusiveLocksRequiredAttr>(*A)) 11174 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size()); 11175 else if (SharedLocksRequiredAttr *SLR 11176 = dyn_cast<SharedLocksRequiredAttr>(*A)) 11177 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size()); 11178 11179 if (Arg && !Finder.TraverseStmt(Arg)) 11180 return true; 11181 11182 for (unsigned I = 0, N = Args.size(); I != N; ++I) { 11183 if (!Finder.TraverseStmt(Args[I])) 11184 return true; 11185 } 11186 } 11187 11188 return false; 11189} 11190 11191void 11192Sema::checkExceptionSpecification(ExceptionSpecificationType EST, 11193 ArrayRef<ParsedType> DynamicExceptions, 11194 ArrayRef<SourceRange> DynamicExceptionRanges, 11195 Expr *NoexceptExpr, 11196 llvm::SmallVectorImpl<QualType> &Exceptions, 11197 FunctionProtoType::ExtProtoInfo &EPI) { 11198 Exceptions.clear(); 11199 EPI.ExceptionSpecType = EST; 11200 if (EST == EST_Dynamic) { 11201 Exceptions.reserve(DynamicExceptions.size()); 11202 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { 11203 // FIXME: Preserve type source info. 11204 QualType ET = GetTypeFromParser(DynamicExceptions[ei]); 11205 11206 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 11207 collectUnexpandedParameterPacks(ET, Unexpanded); 11208 if (!Unexpanded.empty()) { 11209 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(), 11210 UPPC_ExceptionType, 11211 Unexpanded); 11212 continue; 11213 } 11214 11215 // Check that the type is valid for an exception spec, and 11216 // drop it if not. 11217 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) 11218 Exceptions.push_back(ET); 11219 } 11220 EPI.NumExceptions = Exceptions.size(); 11221 EPI.Exceptions = Exceptions.data(); 11222 return; 11223 } 11224 11225 if (EST == EST_ComputedNoexcept) { 11226 // If an error occurred, there's no expression here. 11227 if (NoexceptExpr) { 11228 assert((NoexceptExpr->isTypeDependent() || 11229 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 11230 Context.BoolTy) && 11231 "Parser should have made sure that the expression is boolean"); 11232 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { 11233 EPI.ExceptionSpecType = EST_BasicNoexcept; 11234 return; 11235 } 11236 11237 if (!NoexceptExpr->isValueDependent()) 11238 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0, 11239 diag::err_noexcept_needs_constant_expression, 11240 /*AllowFold*/ false).take(); 11241 EPI.NoexceptExpr = NoexceptExpr; 11242 } 11243 return; 11244 } 11245} 11246 11247/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 11248Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 11249 // Implicitly declared functions (e.g. copy constructors) are 11250 // __host__ __device__ 11251 if (D->isImplicit()) 11252 return CFT_HostDevice; 11253 11254 if (D->hasAttr<CUDAGlobalAttr>()) 11255 return CFT_Global; 11256 11257 if (D->hasAttr<CUDADeviceAttr>()) { 11258 if (D->hasAttr<CUDAHostAttr>()) 11259 return CFT_HostDevice; 11260 else 11261 return CFT_Device; 11262 } 11263 11264 return CFT_Host; 11265} 11266 11267bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 11268 CUDAFunctionTarget CalleeTarget) { 11269 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 11270 // Callable from the device only." 11271 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 11272 return true; 11273 11274 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 11275 // Callable from the host only." 11276 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 11277 // Callable from the host only." 11278 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 11279 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 11280 return true; 11281 11282 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 11283 return true; 11284 11285 return false; 11286} 11287