SemaDeclCXX.cpp revision 5965b7c7ddf8d9635426943a05441c71cb59fef6
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++11 override control semantics. 1409void Sema::CheckOverrideControl(Decl *D) { 1410 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1411 1412 // Do we know which functions this declaration might be overriding? 1413 bool OverridesAreKnown = !MD || 1414 (!MD->getParent()->hasAnyDependentBases() && 1415 !MD->getType()->isDependentType()); 1416 1417 if (!MD || !MD->isVirtual()) { 1418 if (OverridesAreKnown) { 1419 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) { 1420 Diag(OA->getLocation(), 1421 diag::override_keyword_only_allowed_on_virtual_member_functions) 1422 << "override" << FixItHint::CreateRemoval(OA->getLocation()); 1423 D->dropAttr<OverrideAttr>(); 1424 } 1425 if (FinalAttr *FA = D->getAttr<FinalAttr>()) { 1426 Diag(FA->getLocation(), 1427 diag::override_keyword_only_allowed_on_virtual_member_functions) 1428 << "final" << FixItHint::CreateRemoval(FA->getLocation()); 1429 D->dropAttr<FinalAttr>(); 1430 } 1431 } 1432 return; 1433 } 1434 1435 if (!OverridesAreKnown) 1436 return; 1437 1438 // C++11 [class.virtual]p5: 1439 // If a virtual function is marked with the virt-specifier override and 1440 // does not override a member function of a base class, the program is 1441 // ill-formed. 1442 bool HasOverriddenMethods = 1443 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1444 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) 1445 Diag(MD->getLocation(), diag::err_function_marked_override_not_overriding) 1446 << MD->getDeclName(); 1447} 1448 1449/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1450/// function overrides a virtual member function marked 'final', according to 1451/// C++11 [class.virtual]p4. 1452bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1453 const CXXMethodDecl *Old) { 1454 if (!Old->hasAttr<FinalAttr>()) 1455 return false; 1456 1457 Diag(New->getLocation(), diag::err_final_function_overridden) 1458 << New->getDeclName(); 1459 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1460 return true; 1461} 1462 1463static bool InitializationHasSideEffects(const FieldDecl &FD) { 1464 const Type *T = FD.getType()->getBaseElementTypeUnsafe(); 1465 // FIXME: Destruction of ObjC lifetime types has side-effects. 1466 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl()) 1467 return !RD->isCompleteDefinition() || 1468 !RD->hasTrivialDefaultConstructor() || 1469 !RD->hasTrivialDestructor(); 1470 return false; 1471} 1472 1473/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1474/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1475/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1476/// one has been parsed, and 'InitStyle' is set if an in-class initializer is 1477/// present (but parsing it has been deferred). 1478Decl * 1479Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1480 MultiTemplateParamsArg TemplateParameterLists, 1481 Expr *BW, const VirtSpecifiers &VS, 1482 InClassInitStyle InitStyle) { 1483 const DeclSpec &DS = D.getDeclSpec(); 1484 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1485 DeclarationName Name = NameInfo.getName(); 1486 SourceLocation Loc = NameInfo.getLoc(); 1487 1488 // For anonymous bitfields, the location should point to the type. 1489 if (Loc.isInvalid()) 1490 Loc = D.getLocStart(); 1491 1492 Expr *BitWidth = static_cast<Expr*>(BW); 1493 1494 assert(isa<CXXRecordDecl>(CurContext)); 1495 assert(!DS.isFriendSpecified()); 1496 1497 bool isFunc = D.isDeclarationOfFunction(); 1498 1499 // C++ 9.2p6: A member shall not be declared to have automatic storage 1500 // duration (auto, register) or with the extern storage-class-specifier. 1501 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1502 // data members and cannot be applied to names declared const or static, 1503 // and cannot be applied to reference members. 1504 switch (DS.getStorageClassSpec()) { 1505 case DeclSpec::SCS_unspecified: 1506 case DeclSpec::SCS_typedef: 1507 case DeclSpec::SCS_static: 1508 // FALL THROUGH. 1509 break; 1510 case DeclSpec::SCS_mutable: 1511 if (isFunc) { 1512 if (DS.getStorageClassSpecLoc().isValid()) 1513 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1514 else 1515 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1516 1517 // FIXME: It would be nicer if the keyword was ignored only for this 1518 // declarator. Otherwise we could get follow-up errors. 1519 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1520 } 1521 break; 1522 default: 1523 if (DS.getStorageClassSpecLoc().isValid()) 1524 Diag(DS.getStorageClassSpecLoc(), 1525 diag::err_storageclass_invalid_for_member); 1526 else 1527 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1528 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1529 } 1530 1531 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1532 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1533 !isFunc); 1534 1535 Decl *Member; 1536 if (isInstField) { 1537 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1538 1539 // Data members must have identifiers for names. 1540 if (!Name.isIdentifier()) { 1541 Diag(Loc, diag::err_bad_variable_name) 1542 << Name; 1543 return 0; 1544 } 1545 1546 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1547 1548 // Member field could not be with "template" keyword. 1549 // So TemplateParameterLists should be empty in this case. 1550 if (TemplateParameterLists.size()) { 1551 TemplateParameterList* TemplateParams = TemplateParameterLists.get()[0]; 1552 if (TemplateParams->size()) { 1553 // There is no such thing as a member field template. 1554 Diag(D.getIdentifierLoc(), diag::err_template_member) 1555 << II 1556 << SourceRange(TemplateParams->getTemplateLoc(), 1557 TemplateParams->getRAngleLoc()); 1558 } else { 1559 // There is an extraneous 'template<>' for this member. 1560 Diag(TemplateParams->getTemplateLoc(), 1561 diag::err_template_member_noparams) 1562 << II 1563 << SourceRange(TemplateParams->getTemplateLoc(), 1564 TemplateParams->getRAngleLoc()); 1565 } 1566 return 0; 1567 } 1568 1569 if (SS.isSet() && !SS.isInvalid()) { 1570 // The user provided a superfluous scope specifier inside a class 1571 // definition: 1572 // 1573 // class X { 1574 // int X::member; 1575 // }; 1576 if (DeclContext *DC = computeDeclContext(SS, false)) 1577 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc()); 1578 else 1579 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1580 << Name << SS.getRange(); 1581 1582 SS.clear(); 1583 } 1584 1585 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1586 InitStyle, AS); 1587 assert(Member && "HandleField never returns null"); 1588 } else { 1589 assert(InitStyle == ICIS_NoInit); 1590 1591 Member = HandleDeclarator(S, D, move(TemplateParameterLists)); 1592 if (!Member) { 1593 return 0; 1594 } 1595 1596 // Non-instance-fields can't have a bitfield. 1597 if (BitWidth) { 1598 if (Member->isInvalidDecl()) { 1599 // don't emit another diagnostic. 1600 } else if (isa<VarDecl>(Member)) { 1601 // C++ 9.6p3: A bit-field shall not be a static member. 1602 // "static member 'A' cannot be a bit-field" 1603 Diag(Loc, diag::err_static_not_bitfield) 1604 << Name << BitWidth->getSourceRange(); 1605 } else if (isa<TypedefDecl>(Member)) { 1606 // "typedef member 'x' cannot be a bit-field" 1607 Diag(Loc, diag::err_typedef_not_bitfield) 1608 << Name << BitWidth->getSourceRange(); 1609 } else { 1610 // A function typedef ("typedef int f(); f a;"). 1611 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1612 Diag(Loc, diag::err_not_integral_type_bitfield) 1613 << Name << cast<ValueDecl>(Member)->getType() 1614 << BitWidth->getSourceRange(); 1615 } 1616 1617 BitWidth = 0; 1618 Member->setInvalidDecl(); 1619 } 1620 1621 Member->setAccess(AS); 1622 1623 // If we have declared a member function template, set the access of the 1624 // templated declaration as well. 1625 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1626 FunTmpl->getTemplatedDecl()->setAccess(AS); 1627 } 1628 1629 if (VS.isOverrideSpecified()) 1630 Member->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1631 if (VS.isFinalSpecified()) 1632 Member->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1633 1634 if (VS.getLastLocation().isValid()) { 1635 // Update the end location of a method that has a virt-specifiers. 1636 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1637 MD->setRangeEnd(VS.getLastLocation()); 1638 } 1639 1640 CheckOverrideControl(Member); 1641 1642 assert((Name || isInstField) && "No identifier for non-field ?"); 1643 1644 if (isInstField) { 1645 FieldDecl *FD = cast<FieldDecl>(Member); 1646 FieldCollector->Add(FD); 1647 1648 if (Diags.getDiagnosticLevel(diag::warn_unused_private_field, 1649 FD->getLocation()) 1650 != DiagnosticsEngine::Ignored) { 1651 // Remember all explicit private FieldDecls that have a name, no side 1652 // effects and are not part of a dependent type declaration. 1653 if (!FD->isImplicit() && FD->getDeclName() && 1654 FD->getAccess() == AS_private && 1655 !FD->hasAttr<UnusedAttr>() && 1656 !FD->getParent()->isDependentContext() && 1657 !InitializationHasSideEffects(*FD)) 1658 UnusedPrivateFields.insert(FD); 1659 } 1660 } 1661 1662 return Member; 1663} 1664 1665/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1666/// in-class initializer for a non-static C++ class member, and after 1667/// instantiating an in-class initializer in a class template. Such actions 1668/// are deferred until the class is complete. 1669void 1670Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation InitLoc, 1671 Expr *InitExpr) { 1672 FieldDecl *FD = cast<FieldDecl>(D); 1673 assert(FD->getInClassInitStyle() != ICIS_NoInit && 1674 "must set init style when field is created"); 1675 1676 if (!InitExpr) { 1677 FD->setInvalidDecl(); 1678 FD->removeInClassInitializer(); 1679 return; 1680 } 1681 1682 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1683 FD->setInvalidDecl(); 1684 FD->removeInClassInitializer(); 1685 return; 1686 } 1687 1688 ExprResult Init = InitExpr; 1689 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1690 if (isa<InitListExpr>(InitExpr) && isStdInitializerList(FD->getType(), 0)) { 1691 Diag(FD->getLocation(), diag::warn_dangling_std_initializer_list) 1692 << /*at end of ctor*/1 << InitExpr->getSourceRange(); 1693 } 1694 Expr **Inits = &InitExpr; 1695 unsigned NumInits = 1; 1696 InitializedEntity Entity = InitializedEntity::InitializeMember(FD); 1697 InitializationKind Kind = FD->getInClassInitStyle() == ICIS_ListInit 1698 ? InitializationKind::CreateDirectList(InitExpr->getLocStart()) 1699 : InitializationKind::CreateCopy(InitExpr->getLocStart(), InitLoc); 1700 InitializationSequence Seq(*this, Entity, Kind, Inits, NumInits); 1701 Init = Seq.Perform(*this, Entity, Kind, MultiExprArg(Inits, NumInits)); 1702 if (Init.isInvalid()) { 1703 FD->setInvalidDecl(); 1704 return; 1705 } 1706 1707 CheckImplicitConversions(Init.get(), InitLoc); 1708 } 1709 1710 // C++0x [class.base.init]p7: 1711 // The initialization of each base and member constitutes a 1712 // full-expression. 1713 Init = MaybeCreateExprWithCleanups(Init); 1714 if (Init.isInvalid()) { 1715 FD->setInvalidDecl(); 1716 return; 1717 } 1718 1719 InitExpr = Init.release(); 1720 1721 FD->setInClassInitializer(InitExpr); 1722} 1723 1724/// \brief Find the direct and/or virtual base specifiers that 1725/// correspond to the given base type, for use in base initialization 1726/// within a constructor. 1727static bool FindBaseInitializer(Sema &SemaRef, 1728 CXXRecordDecl *ClassDecl, 1729 QualType BaseType, 1730 const CXXBaseSpecifier *&DirectBaseSpec, 1731 const CXXBaseSpecifier *&VirtualBaseSpec) { 1732 // First, check for a direct base class. 1733 DirectBaseSpec = 0; 1734 for (CXXRecordDecl::base_class_const_iterator Base 1735 = ClassDecl->bases_begin(); 1736 Base != ClassDecl->bases_end(); ++Base) { 1737 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1738 // We found a direct base of this type. That's what we're 1739 // initializing. 1740 DirectBaseSpec = &*Base; 1741 break; 1742 } 1743 } 1744 1745 // Check for a virtual base class. 1746 // FIXME: We might be able to short-circuit this if we know in advance that 1747 // there are no virtual bases. 1748 VirtualBaseSpec = 0; 1749 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1750 // We haven't found a base yet; search the class hierarchy for a 1751 // virtual base class. 1752 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1753 /*DetectVirtual=*/false); 1754 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1755 BaseType, Paths)) { 1756 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1757 Path != Paths.end(); ++Path) { 1758 if (Path->back().Base->isVirtual()) { 1759 VirtualBaseSpec = Path->back().Base; 1760 break; 1761 } 1762 } 1763 } 1764 } 1765 1766 return DirectBaseSpec || VirtualBaseSpec; 1767} 1768 1769/// \brief Handle a C++ member initializer using braced-init-list syntax. 1770MemInitResult 1771Sema::ActOnMemInitializer(Decl *ConstructorD, 1772 Scope *S, 1773 CXXScopeSpec &SS, 1774 IdentifierInfo *MemberOrBase, 1775 ParsedType TemplateTypeTy, 1776 const DeclSpec &DS, 1777 SourceLocation IdLoc, 1778 Expr *InitList, 1779 SourceLocation EllipsisLoc) { 1780 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1781 DS, IdLoc, InitList, 1782 EllipsisLoc); 1783} 1784 1785/// \brief Handle a C++ member initializer using parentheses syntax. 1786MemInitResult 1787Sema::ActOnMemInitializer(Decl *ConstructorD, 1788 Scope *S, 1789 CXXScopeSpec &SS, 1790 IdentifierInfo *MemberOrBase, 1791 ParsedType TemplateTypeTy, 1792 const DeclSpec &DS, 1793 SourceLocation IdLoc, 1794 SourceLocation LParenLoc, 1795 Expr **Args, unsigned NumArgs, 1796 SourceLocation RParenLoc, 1797 SourceLocation EllipsisLoc) { 1798 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1799 RParenLoc); 1800 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1801 DS, IdLoc, List, EllipsisLoc); 1802} 1803 1804namespace { 1805 1806// Callback to only accept typo corrections that can be a valid C++ member 1807// intializer: either a non-static field member or a base class. 1808class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 1809 public: 1810 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 1811 : ClassDecl(ClassDecl) {} 1812 1813 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 1814 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 1815 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 1816 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 1817 else 1818 return isa<TypeDecl>(ND); 1819 } 1820 return false; 1821 } 1822 1823 private: 1824 CXXRecordDecl *ClassDecl; 1825}; 1826 1827} 1828 1829/// \brief Handle a C++ member initializer. 1830MemInitResult 1831Sema::BuildMemInitializer(Decl *ConstructorD, 1832 Scope *S, 1833 CXXScopeSpec &SS, 1834 IdentifierInfo *MemberOrBase, 1835 ParsedType TemplateTypeTy, 1836 const DeclSpec &DS, 1837 SourceLocation IdLoc, 1838 Expr *Init, 1839 SourceLocation EllipsisLoc) { 1840 if (!ConstructorD) 1841 return true; 1842 1843 AdjustDeclIfTemplate(ConstructorD); 1844 1845 CXXConstructorDecl *Constructor 1846 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1847 if (!Constructor) { 1848 // The user wrote a constructor initializer on a function that is 1849 // not a C++ constructor. Ignore the error for now, because we may 1850 // have more member initializers coming; we'll diagnose it just 1851 // once in ActOnMemInitializers. 1852 return true; 1853 } 1854 1855 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1856 1857 // C++ [class.base.init]p2: 1858 // Names in a mem-initializer-id are looked up in the scope of the 1859 // constructor's class and, if not found in that scope, are looked 1860 // up in the scope containing the constructor's definition. 1861 // [Note: if the constructor's class contains a member with the 1862 // same name as a direct or virtual base class of the class, a 1863 // mem-initializer-id naming the member or base class and composed 1864 // of a single identifier refers to the class member. A 1865 // mem-initializer-id for the hidden base class may be specified 1866 // using a qualified name. ] 1867 if (!SS.getScopeRep() && !TemplateTypeTy) { 1868 // Look for a member, first. 1869 DeclContext::lookup_result Result 1870 = ClassDecl->lookup(MemberOrBase); 1871 if (Result.first != Result.second) { 1872 ValueDecl *Member; 1873 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 1874 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 1875 if (EllipsisLoc.isValid()) 1876 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1877 << MemberOrBase 1878 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 1879 1880 return BuildMemberInitializer(Member, Init, IdLoc); 1881 } 1882 } 1883 } 1884 // It didn't name a member, so see if it names a class. 1885 QualType BaseType; 1886 TypeSourceInfo *TInfo = 0; 1887 1888 if (TemplateTypeTy) { 1889 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1890 } else if (DS.getTypeSpecType() == TST_decltype) { 1891 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 1892 } else { 1893 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1894 LookupParsedName(R, S, &SS); 1895 1896 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1897 if (!TyD) { 1898 if (R.isAmbiguous()) return true; 1899 1900 // We don't want access-control diagnostics here. 1901 R.suppressDiagnostics(); 1902 1903 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1904 bool NotUnknownSpecialization = false; 1905 DeclContext *DC = computeDeclContext(SS, false); 1906 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1907 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1908 1909 if (!NotUnknownSpecialization) { 1910 // When the scope specifier can refer to a member of an unknown 1911 // specialization, we take it as a type name. 1912 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1913 SS.getWithLocInContext(Context), 1914 *MemberOrBase, IdLoc); 1915 if (BaseType.isNull()) 1916 return true; 1917 1918 R.clear(); 1919 R.setLookupName(MemberOrBase); 1920 } 1921 } 1922 1923 // If no results were found, try to correct typos. 1924 TypoCorrection Corr; 1925 MemInitializerValidatorCCC Validator(ClassDecl); 1926 if (R.empty() && BaseType.isNull() && 1927 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1928 Validator, ClassDecl))) { 1929 std::string CorrectedStr(Corr.getAsString(getLangOpts())); 1930 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOpts())); 1931 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1932 // We have found a non-static data member with a similar 1933 // name to what was typed; complain and initialize that 1934 // member. 1935 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1936 << MemberOrBase << true << CorrectedQuotedStr 1937 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1938 Diag(Member->getLocation(), diag::note_previous_decl) 1939 << CorrectedQuotedStr; 1940 1941 return BuildMemberInitializer(Member, Init, IdLoc); 1942 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1943 const CXXBaseSpecifier *DirectBaseSpec; 1944 const CXXBaseSpecifier *VirtualBaseSpec; 1945 if (FindBaseInitializer(*this, ClassDecl, 1946 Context.getTypeDeclType(Type), 1947 DirectBaseSpec, VirtualBaseSpec)) { 1948 // We have found a direct or virtual base class with a 1949 // similar name to what was typed; complain and initialize 1950 // that base class. 1951 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1952 << MemberOrBase << false << CorrectedQuotedStr 1953 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1954 1955 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1956 : VirtualBaseSpec; 1957 Diag(BaseSpec->getLocStart(), 1958 diag::note_base_class_specified_here) 1959 << BaseSpec->getType() 1960 << BaseSpec->getSourceRange(); 1961 1962 TyD = Type; 1963 } 1964 } 1965 } 1966 1967 if (!TyD && BaseType.isNull()) { 1968 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1969 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 1970 return true; 1971 } 1972 } 1973 1974 if (BaseType.isNull()) { 1975 BaseType = Context.getTypeDeclType(TyD); 1976 if (SS.isSet()) { 1977 NestedNameSpecifier *Qualifier = 1978 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1979 1980 // FIXME: preserve source range information 1981 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1982 } 1983 } 1984 } 1985 1986 if (!TInfo) 1987 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1988 1989 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 1990} 1991 1992/// Checks a member initializer expression for cases where reference (or 1993/// pointer) members are bound to by-value parameters (or their addresses). 1994static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 1995 Expr *Init, 1996 SourceLocation IdLoc) { 1997 QualType MemberTy = Member->getType(); 1998 1999 // We only handle pointers and references currently. 2000 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 2001 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 2002 return; 2003 2004 const bool IsPointer = MemberTy->isPointerType(); 2005 if (IsPointer) { 2006 if (const UnaryOperator *Op 2007 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 2008 // The only case we're worried about with pointers requires taking the 2009 // address. 2010 if (Op->getOpcode() != UO_AddrOf) 2011 return; 2012 2013 Init = Op->getSubExpr(); 2014 } else { 2015 // We only handle address-of expression initializers for pointers. 2016 return; 2017 } 2018 } 2019 2020 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 2021 // Taking the address of a temporary will be diagnosed as a hard error. 2022 if (IsPointer) 2023 return; 2024 2025 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 2026 << Member << Init->getSourceRange(); 2027 } else if (const DeclRefExpr *DRE 2028 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 2029 // We only warn when referring to a non-reference parameter declaration. 2030 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 2031 if (!Parameter || Parameter->getType()->isReferenceType()) 2032 return; 2033 2034 S.Diag(Init->getExprLoc(), 2035 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 2036 : diag::warn_bind_ref_member_to_parameter) 2037 << Member << Parameter << Init->getSourceRange(); 2038 } else { 2039 // Other initializers are fine. 2040 return; 2041 } 2042 2043 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 2044 << (unsigned)IsPointer; 2045} 2046 2047namespace { 2048 class UninitializedFieldVisitor 2049 : public EvaluatedExprVisitor<UninitializedFieldVisitor> { 2050 Sema &S; 2051 ValueDecl *VD; 2052 public: 2053 typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited; 2054 UninitializedFieldVisitor(Sema &S, ValueDecl *VD) : Inherited(S.Context), 2055 S(S), VD(VD) { 2056 } 2057 2058 void HandleExpr(Expr *E) { 2059 if (!E) return; 2060 2061 // Expressions like x(x) sometimes lack the surrounding expressions 2062 // but need to be checked anyways. 2063 HandleValue(E); 2064 Visit(E); 2065 } 2066 2067 void HandleValue(Expr *E) { 2068 E = E->IgnoreParens(); 2069 2070 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 2071 if (isa<EnumConstantDecl>(ME->getMemberDecl())) 2072 return; 2073 Expr *Base = E; 2074 while (isa<MemberExpr>(Base)) { 2075 ME = dyn_cast<MemberExpr>(Base); 2076 if (VarDecl *VarD = dyn_cast<VarDecl>(ME->getMemberDecl())) 2077 if (VarD->hasGlobalStorage()) 2078 return; 2079 Base = ME->getBase(); 2080 } 2081 2082 if (VD == ME->getMemberDecl() && isa<CXXThisExpr>(Base)) { 2083 unsigned diag = VD->getType()->isReferenceType() 2084 ? diag::warn_reference_field_is_uninit 2085 : diag::warn_field_is_uninit; 2086 S.Diag(ME->getExprLoc(), diag); 2087 return; 2088 } 2089 } 2090 2091 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 2092 HandleValue(CO->getTrueExpr()); 2093 HandleValue(CO->getFalseExpr()); 2094 return; 2095 } 2096 2097 if (BinaryConditionalOperator *BCO = 2098 dyn_cast<BinaryConditionalOperator>(E)) { 2099 HandleValue(BCO->getCommon()); 2100 HandleValue(BCO->getFalseExpr()); 2101 return; 2102 } 2103 2104 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 2105 switch (BO->getOpcode()) { 2106 default: 2107 return; 2108 case(BO_PtrMemD): 2109 case(BO_PtrMemI): 2110 HandleValue(BO->getLHS()); 2111 return; 2112 case(BO_Comma): 2113 HandleValue(BO->getRHS()); 2114 return; 2115 } 2116 } 2117 } 2118 2119 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 2120 if (E->getCastKind() == CK_LValueToRValue) 2121 HandleValue(E->getSubExpr()); 2122 2123 Inherited::VisitImplicitCastExpr(E); 2124 } 2125 2126 void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) { 2127 Expr *Callee = E->getCallee(); 2128 if (isa<MemberExpr>(Callee)) 2129 HandleValue(Callee); 2130 2131 Inherited::VisitCXXMemberCallExpr(E); 2132 } 2133 }; 2134 static void CheckInitExprContainsUninitializedFields(Sema &S, Expr *E, 2135 ValueDecl *VD) { 2136 UninitializedFieldVisitor(S, VD).HandleExpr(E); 2137 } 2138} // namespace 2139 2140MemInitResult 2141Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2142 SourceLocation IdLoc) { 2143 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2144 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2145 assert((DirectMember || IndirectMember) && 2146 "Member must be a FieldDecl or IndirectFieldDecl"); 2147 2148 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2149 return true; 2150 2151 if (Member->isInvalidDecl()) 2152 return true; 2153 2154 // Diagnose value-uses of fields to initialize themselves, e.g. 2155 // foo(foo) 2156 // where foo is not also a parameter to the constructor. 2157 // TODO: implement -Wuninitialized and fold this into that framework. 2158 Expr **Args; 2159 unsigned NumArgs; 2160 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2161 Args = ParenList->getExprs(); 2162 NumArgs = ParenList->getNumExprs(); 2163 } else { 2164 InitListExpr *InitList = cast<InitListExpr>(Init); 2165 Args = InitList->getInits(); 2166 NumArgs = InitList->getNumInits(); 2167 } 2168 2169 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, IdLoc) 2170 != DiagnosticsEngine::Ignored) 2171 for (unsigned i = 0; i < NumArgs; ++i) 2172 // FIXME: Warn about the case when other fields are used before being 2173 // uninitialized. For example, let this field be the i'th field. When 2174 // initializing the i'th field, throw a warning if any of the >= i'th 2175 // fields are used, as they are not yet initialized. 2176 // Right now we are only handling the case where the i'th field uses 2177 // itself in its initializer. 2178 CheckInitExprContainsUninitializedFields(*this, Args[i], Member); 2179 2180 SourceRange InitRange = Init->getSourceRange(); 2181 2182 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2183 // Can't check initialization for a member of dependent type or when 2184 // any of the arguments are type-dependent expressions. 2185 DiscardCleanupsInEvaluationContext(); 2186 } else { 2187 bool InitList = false; 2188 if (isa<InitListExpr>(Init)) { 2189 InitList = true; 2190 Args = &Init; 2191 NumArgs = 1; 2192 2193 if (isStdInitializerList(Member->getType(), 0)) { 2194 Diag(IdLoc, diag::warn_dangling_std_initializer_list) 2195 << /*at end of ctor*/1 << InitRange; 2196 } 2197 } 2198 2199 // Initialize the member. 2200 InitializedEntity MemberEntity = 2201 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2202 : InitializedEntity::InitializeMember(IndirectMember, 0); 2203 InitializationKind Kind = 2204 InitList ? InitializationKind::CreateDirectList(IdLoc) 2205 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2206 InitRange.getEnd()); 2207 2208 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 2209 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, 2210 MultiExprArg(*this, Args, NumArgs), 2211 0); 2212 if (MemberInit.isInvalid()) 2213 return true; 2214 2215 CheckImplicitConversions(MemberInit.get(), 2216 InitRange.getBegin()); 2217 2218 // C++0x [class.base.init]p7: 2219 // The initialization of each base and member constitutes a 2220 // full-expression. 2221 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2222 if (MemberInit.isInvalid()) 2223 return true; 2224 2225 // If we are in a dependent context, template instantiation will 2226 // perform this type-checking again. Just save the arguments that we 2227 // received. 2228 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2229 // of the information that we have about the member 2230 // initializer. However, deconstructing the ASTs is a dicey process, 2231 // and this approach is far more likely to get the corner cases right. 2232 if (CurContext->isDependentContext()) { 2233 // The existing Init will do fine. 2234 } else { 2235 Init = MemberInit.get(); 2236 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2237 } 2238 } 2239 2240 if (DirectMember) { 2241 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2242 InitRange.getBegin(), Init, 2243 InitRange.getEnd()); 2244 } else { 2245 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2246 InitRange.getBegin(), Init, 2247 InitRange.getEnd()); 2248 } 2249} 2250 2251MemInitResult 2252Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2253 CXXRecordDecl *ClassDecl) { 2254 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2255 if (!LangOpts.CPlusPlus0x) 2256 return Diag(NameLoc, diag::err_delegating_ctor) 2257 << TInfo->getTypeLoc().getLocalSourceRange(); 2258 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2259 2260 bool InitList = true; 2261 Expr **Args = &Init; 2262 unsigned NumArgs = 1; 2263 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2264 InitList = false; 2265 Args = ParenList->getExprs(); 2266 NumArgs = ParenList->getNumExprs(); 2267 } 2268 2269 SourceRange InitRange = Init->getSourceRange(); 2270 // Initialize the object. 2271 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2272 QualType(ClassDecl->getTypeForDecl(), 0)); 2273 InitializationKind Kind = 2274 InitList ? InitializationKind::CreateDirectList(NameLoc) 2275 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2276 InitRange.getEnd()); 2277 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 2278 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2279 MultiExprArg(*this, Args,NumArgs), 2280 0); 2281 if (DelegationInit.isInvalid()) 2282 return true; 2283 2284 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2285 "Delegating constructor with no target?"); 2286 2287 CheckImplicitConversions(DelegationInit.get(), InitRange.getBegin()); 2288 2289 // C++0x [class.base.init]p7: 2290 // The initialization of each base and member constitutes a 2291 // full-expression. 2292 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2293 if (DelegationInit.isInvalid()) 2294 return true; 2295 2296 // If we are in a dependent context, template instantiation will 2297 // perform this type-checking again. Just save the arguments that we 2298 // received in a ParenListExpr. 2299 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2300 // of the information that we have about the base 2301 // initializer. However, deconstructing the ASTs is a dicey process, 2302 // and this approach is far more likely to get the corner cases right. 2303 if (CurContext->isDependentContext()) 2304 DelegationInit = Owned(Init); 2305 2306 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2307 DelegationInit.takeAs<Expr>(), 2308 InitRange.getEnd()); 2309} 2310 2311MemInitResult 2312Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2313 Expr *Init, CXXRecordDecl *ClassDecl, 2314 SourceLocation EllipsisLoc) { 2315 SourceLocation BaseLoc 2316 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2317 2318 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2319 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2320 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2321 2322 // C++ [class.base.init]p2: 2323 // [...] Unless the mem-initializer-id names a nonstatic data 2324 // member of the constructor's class or a direct or virtual base 2325 // of that class, the mem-initializer is ill-formed. A 2326 // mem-initializer-list can initialize a base class using any 2327 // name that denotes that base class type. 2328 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2329 2330 SourceRange InitRange = Init->getSourceRange(); 2331 if (EllipsisLoc.isValid()) { 2332 // This is a pack expansion. 2333 if (!BaseType->containsUnexpandedParameterPack()) { 2334 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2335 << SourceRange(BaseLoc, InitRange.getEnd()); 2336 2337 EllipsisLoc = SourceLocation(); 2338 } 2339 } else { 2340 // Check for any unexpanded parameter packs. 2341 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2342 return true; 2343 2344 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2345 return true; 2346 } 2347 2348 // Check for direct and virtual base classes. 2349 const CXXBaseSpecifier *DirectBaseSpec = 0; 2350 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2351 if (!Dependent) { 2352 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2353 BaseType)) 2354 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2355 2356 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2357 VirtualBaseSpec); 2358 2359 // C++ [base.class.init]p2: 2360 // Unless the mem-initializer-id names a nonstatic data member of the 2361 // constructor's class or a direct or virtual base of that class, the 2362 // mem-initializer is ill-formed. 2363 if (!DirectBaseSpec && !VirtualBaseSpec) { 2364 // If the class has any dependent bases, then it's possible that 2365 // one of those types will resolve to the same type as 2366 // BaseType. Therefore, just treat this as a dependent base 2367 // class initialization. FIXME: Should we try to check the 2368 // initialization anyway? It seems odd. 2369 if (ClassDecl->hasAnyDependentBases()) 2370 Dependent = true; 2371 else 2372 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2373 << BaseType << Context.getTypeDeclType(ClassDecl) 2374 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2375 } 2376 } 2377 2378 if (Dependent) { 2379 DiscardCleanupsInEvaluationContext(); 2380 2381 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2382 /*IsVirtual=*/false, 2383 InitRange.getBegin(), Init, 2384 InitRange.getEnd(), EllipsisLoc); 2385 } 2386 2387 // C++ [base.class.init]p2: 2388 // If a mem-initializer-id is ambiguous because it designates both 2389 // a direct non-virtual base class and an inherited virtual base 2390 // class, the mem-initializer is ill-formed. 2391 if (DirectBaseSpec && VirtualBaseSpec) 2392 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2393 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2394 2395 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2396 if (!BaseSpec) 2397 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2398 2399 // Initialize the base. 2400 bool InitList = true; 2401 Expr **Args = &Init; 2402 unsigned NumArgs = 1; 2403 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2404 InitList = false; 2405 Args = ParenList->getExprs(); 2406 NumArgs = ParenList->getNumExprs(); 2407 } 2408 2409 InitializedEntity BaseEntity = 2410 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2411 InitializationKind Kind = 2412 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2413 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2414 InitRange.getEnd()); 2415 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 2416 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, 2417 MultiExprArg(*this, Args, NumArgs), 2418 0); 2419 if (BaseInit.isInvalid()) 2420 return true; 2421 2422 CheckImplicitConversions(BaseInit.get(), InitRange.getBegin()); 2423 2424 // C++0x [class.base.init]p7: 2425 // The initialization of each base and member constitutes a 2426 // full-expression. 2427 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2428 if (BaseInit.isInvalid()) 2429 return true; 2430 2431 // If we are in a dependent context, template instantiation will 2432 // perform this type-checking again. Just save the arguments that we 2433 // received in a ParenListExpr. 2434 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2435 // of the information that we have about the base 2436 // initializer. However, deconstructing the ASTs is a dicey process, 2437 // and this approach is far more likely to get the corner cases right. 2438 if (CurContext->isDependentContext()) 2439 BaseInit = Owned(Init); 2440 2441 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2442 BaseSpec->isVirtual(), 2443 InitRange.getBegin(), 2444 BaseInit.takeAs<Expr>(), 2445 InitRange.getEnd(), EllipsisLoc); 2446} 2447 2448// Create a static_cast\<T&&>(expr). 2449static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2450 QualType ExprType = E->getType(); 2451 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2452 SourceLocation ExprLoc = E->getLocStart(); 2453 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2454 TargetType, ExprLoc); 2455 2456 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2457 SourceRange(ExprLoc, ExprLoc), 2458 E->getSourceRange()).take(); 2459} 2460 2461/// ImplicitInitializerKind - How an implicit base or member initializer should 2462/// initialize its base or member. 2463enum ImplicitInitializerKind { 2464 IIK_Default, 2465 IIK_Copy, 2466 IIK_Move 2467}; 2468 2469static bool 2470BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2471 ImplicitInitializerKind ImplicitInitKind, 2472 CXXBaseSpecifier *BaseSpec, 2473 bool IsInheritedVirtualBase, 2474 CXXCtorInitializer *&CXXBaseInit) { 2475 InitializedEntity InitEntity 2476 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2477 IsInheritedVirtualBase); 2478 2479 ExprResult BaseInit; 2480 2481 switch (ImplicitInitKind) { 2482 case IIK_Default: { 2483 InitializationKind InitKind 2484 = InitializationKind::CreateDefault(Constructor->getLocation()); 2485 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2486 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2487 MultiExprArg(SemaRef, 0, 0)); 2488 break; 2489 } 2490 2491 case IIK_Move: 2492 case IIK_Copy: { 2493 bool Moving = ImplicitInitKind == IIK_Move; 2494 ParmVarDecl *Param = Constructor->getParamDecl(0); 2495 QualType ParamType = Param->getType().getNonReferenceType(); 2496 2497 Expr *CopyCtorArg = 2498 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2499 SourceLocation(), Param, false, 2500 Constructor->getLocation(), ParamType, 2501 VK_LValue, 0); 2502 2503 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2504 2505 // Cast to the base class to avoid ambiguities. 2506 QualType ArgTy = 2507 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2508 ParamType.getQualifiers()); 2509 2510 if (Moving) { 2511 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2512 } 2513 2514 CXXCastPath BasePath; 2515 BasePath.push_back(BaseSpec); 2516 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2517 CK_UncheckedDerivedToBase, 2518 Moving ? VK_XValue : VK_LValue, 2519 &BasePath).take(); 2520 2521 InitializationKind InitKind 2522 = InitializationKind::CreateDirect(Constructor->getLocation(), 2523 SourceLocation(), SourceLocation()); 2524 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2525 &CopyCtorArg, 1); 2526 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2527 MultiExprArg(&CopyCtorArg, 1)); 2528 break; 2529 } 2530 } 2531 2532 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2533 if (BaseInit.isInvalid()) 2534 return true; 2535 2536 CXXBaseInit = 2537 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2538 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2539 SourceLocation()), 2540 BaseSpec->isVirtual(), 2541 SourceLocation(), 2542 BaseInit.takeAs<Expr>(), 2543 SourceLocation(), 2544 SourceLocation()); 2545 2546 return false; 2547} 2548 2549static bool RefersToRValueRef(Expr *MemRef) { 2550 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2551 return Referenced->getType()->isRValueReferenceType(); 2552} 2553 2554static bool 2555BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2556 ImplicitInitializerKind ImplicitInitKind, 2557 FieldDecl *Field, IndirectFieldDecl *Indirect, 2558 CXXCtorInitializer *&CXXMemberInit) { 2559 if (Field->isInvalidDecl()) 2560 return true; 2561 2562 SourceLocation Loc = Constructor->getLocation(); 2563 2564 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2565 bool Moving = ImplicitInitKind == IIK_Move; 2566 ParmVarDecl *Param = Constructor->getParamDecl(0); 2567 QualType ParamType = Param->getType().getNonReferenceType(); 2568 2569 // Suppress copying zero-width bitfields. 2570 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2571 return false; 2572 2573 Expr *MemberExprBase = 2574 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2575 SourceLocation(), Param, false, 2576 Loc, ParamType, VK_LValue, 0); 2577 2578 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2579 2580 if (Moving) { 2581 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2582 } 2583 2584 // Build a reference to this field within the parameter. 2585 CXXScopeSpec SS; 2586 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2587 Sema::LookupMemberName); 2588 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2589 : cast<ValueDecl>(Field), AS_public); 2590 MemberLookup.resolveKind(); 2591 ExprResult CtorArg 2592 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2593 ParamType, Loc, 2594 /*IsArrow=*/false, 2595 SS, 2596 /*TemplateKWLoc=*/SourceLocation(), 2597 /*FirstQualifierInScope=*/0, 2598 MemberLookup, 2599 /*TemplateArgs=*/0); 2600 if (CtorArg.isInvalid()) 2601 return true; 2602 2603 // C++11 [class.copy]p15: 2604 // - if a member m has rvalue reference type T&&, it is direct-initialized 2605 // with static_cast<T&&>(x.m); 2606 if (RefersToRValueRef(CtorArg.get())) { 2607 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2608 } 2609 2610 // When the field we are copying is an array, create index variables for 2611 // each dimension of the array. We use these index variables to subscript 2612 // the source array, and other clients (e.g., CodeGen) will perform the 2613 // necessary iteration with these index variables. 2614 SmallVector<VarDecl *, 4> IndexVariables; 2615 QualType BaseType = Field->getType(); 2616 QualType SizeType = SemaRef.Context.getSizeType(); 2617 bool InitializingArray = false; 2618 while (const ConstantArrayType *Array 2619 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2620 InitializingArray = true; 2621 // Create the iteration variable for this array index. 2622 IdentifierInfo *IterationVarName = 0; 2623 { 2624 SmallString<8> Str; 2625 llvm::raw_svector_ostream OS(Str); 2626 OS << "__i" << IndexVariables.size(); 2627 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2628 } 2629 VarDecl *IterationVar 2630 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2631 IterationVarName, SizeType, 2632 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2633 SC_None, SC_None); 2634 IndexVariables.push_back(IterationVar); 2635 2636 // Create a reference to the iteration variable. 2637 ExprResult IterationVarRef 2638 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2639 assert(!IterationVarRef.isInvalid() && 2640 "Reference to invented variable cannot fail!"); 2641 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2642 assert(!IterationVarRef.isInvalid() && 2643 "Conversion of invented variable cannot fail!"); 2644 2645 // Subscript the array with this iteration variable. 2646 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2647 IterationVarRef.take(), 2648 Loc); 2649 if (CtorArg.isInvalid()) 2650 return true; 2651 2652 BaseType = Array->getElementType(); 2653 } 2654 2655 // The array subscript expression is an lvalue, which is wrong for moving. 2656 if (Moving && InitializingArray) 2657 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2658 2659 // Construct the entity that we will be initializing. For an array, this 2660 // will be first element in the array, which may require several levels 2661 // of array-subscript entities. 2662 SmallVector<InitializedEntity, 4> Entities; 2663 Entities.reserve(1 + IndexVariables.size()); 2664 if (Indirect) 2665 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2666 else 2667 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2668 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2669 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2670 0, 2671 Entities.back())); 2672 2673 // Direct-initialize to use the copy constructor. 2674 InitializationKind InitKind = 2675 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2676 2677 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2678 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2679 &CtorArgE, 1); 2680 2681 ExprResult MemberInit 2682 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2683 MultiExprArg(&CtorArgE, 1)); 2684 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2685 if (MemberInit.isInvalid()) 2686 return true; 2687 2688 if (Indirect) { 2689 assert(IndexVariables.size() == 0 && 2690 "Indirect field improperly initialized"); 2691 CXXMemberInit 2692 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2693 Loc, Loc, 2694 MemberInit.takeAs<Expr>(), 2695 Loc); 2696 } else 2697 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2698 Loc, MemberInit.takeAs<Expr>(), 2699 Loc, 2700 IndexVariables.data(), 2701 IndexVariables.size()); 2702 return false; 2703 } 2704 2705 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2706 2707 QualType FieldBaseElementType = 2708 SemaRef.Context.getBaseElementType(Field->getType()); 2709 2710 if (FieldBaseElementType->isRecordType()) { 2711 InitializedEntity InitEntity 2712 = Indirect? InitializedEntity::InitializeMember(Indirect) 2713 : InitializedEntity::InitializeMember(Field); 2714 InitializationKind InitKind = 2715 InitializationKind::CreateDefault(Loc); 2716 2717 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2718 ExprResult MemberInit = 2719 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2720 2721 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2722 if (MemberInit.isInvalid()) 2723 return true; 2724 2725 if (Indirect) 2726 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2727 Indirect, Loc, 2728 Loc, 2729 MemberInit.get(), 2730 Loc); 2731 else 2732 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2733 Field, Loc, Loc, 2734 MemberInit.get(), 2735 Loc); 2736 return false; 2737 } 2738 2739 if (!Field->getParent()->isUnion()) { 2740 if (FieldBaseElementType->isReferenceType()) { 2741 SemaRef.Diag(Constructor->getLocation(), 2742 diag::err_uninitialized_member_in_ctor) 2743 << (int)Constructor->isImplicit() 2744 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2745 << 0 << Field->getDeclName(); 2746 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2747 return true; 2748 } 2749 2750 if (FieldBaseElementType.isConstQualified()) { 2751 SemaRef.Diag(Constructor->getLocation(), 2752 diag::err_uninitialized_member_in_ctor) 2753 << (int)Constructor->isImplicit() 2754 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2755 << 1 << Field->getDeclName(); 2756 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2757 return true; 2758 } 2759 } 2760 2761 if (SemaRef.getLangOpts().ObjCAutoRefCount && 2762 FieldBaseElementType->isObjCRetainableType() && 2763 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2764 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2765 // ARC: 2766 // Default-initialize Objective-C pointers to NULL. 2767 CXXMemberInit 2768 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2769 Loc, Loc, 2770 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2771 Loc); 2772 return false; 2773 } 2774 2775 // Nothing to initialize. 2776 CXXMemberInit = 0; 2777 return false; 2778} 2779 2780namespace { 2781struct BaseAndFieldInfo { 2782 Sema &S; 2783 CXXConstructorDecl *Ctor; 2784 bool AnyErrorsInInits; 2785 ImplicitInitializerKind IIK; 2786 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2787 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2788 2789 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2790 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2791 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2792 if (Generated && Ctor->isCopyConstructor()) 2793 IIK = IIK_Copy; 2794 else if (Generated && Ctor->isMoveConstructor()) 2795 IIK = IIK_Move; 2796 else 2797 IIK = IIK_Default; 2798 } 2799 2800 bool isImplicitCopyOrMove() const { 2801 switch (IIK) { 2802 case IIK_Copy: 2803 case IIK_Move: 2804 return true; 2805 2806 case IIK_Default: 2807 return false; 2808 } 2809 2810 llvm_unreachable("Invalid ImplicitInitializerKind!"); 2811 } 2812 2813 bool addFieldInitializer(CXXCtorInitializer *Init) { 2814 AllToInit.push_back(Init); 2815 2816 // Check whether this initializer makes the field "used". 2817 if (Init->getInit() && Init->getInit()->HasSideEffects(S.Context)) 2818 S.UnusedPrivateFields.remove(Init->getAnyMember()); 2819 2820 return false; 2821 } 2822}; 2823} 2824 2825/// \brief Determine whether the given indirect field declaration is somewhere 2826/// within an anonymous union. 2827static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2828 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2829 CEnd = F->chain_end(); 2830 C != CEnd; ++C) 2831 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2832 if (Record->isUnion()) 2833 return true; 2834 2835 return false; 2836} 2837 2838/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2839/// array type. 2840static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2841 if (T->isIncompleteArrayType()) 2842 return true; 2843 2844 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2845 if (!ArrayT->getSize()) 2846 return true; 2847 2848 T = ArrayT->getElementType(); 2849 } 2850 2851 return false; 2852} 2853 2854static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2855 FieldDecl *Field, 2856 IndirectFieldDecl *Indirect = 0) { 2857 2858 // Overwhelmingly common case: we have a direct initializer for this field. 2859 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) 2860 return Info.addFieldInitializer(Init); 2861 2862 // C++11 [class.base.init]p8: if the entity is a non-static data member that 2863 // has a brace-or-equal-initializer, the entity is initialized as specified 2864 // in [dcl.init]. 2865 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 2866 CXXCtorInitializer *Init; 2867 if (Indirect) 2868 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2869 SourceLocation(), 2870 SourceLocation(), 0, 2871 SourceLocation()); 2872 else 2873 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2874 SourceLocation(), 2875 SourceLocation(), 0, 2876 SourceLocation()); 2877 return Info.addFieldInitializer(Init); 2878 } 2879 2880 // Don't build an implicit initializer for union members if none was 2881 // explicitly specified. 2882 if (Field->getParent()->isUnion() || 2883 (Indirect && isWithinAnonymousUnion(Indirect))) 2884 return false; 2885 2886 // Don't initialize incomplete or zero-length arrays. 2887 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 2888 return false; 2889 2890 // Don't try to build an implicit initializer if there were semantic 2891 // errors in any of the initializers (and therefore we might be 2892 // missing some that the user actually wrote). 2893 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2894 return false; 2895 2896 CXXCtorInitializer *Init = 0; 2897 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2898 Indirect, Init)) 2899 return true; 2900 2901 if (!Init) 2902 return false; 2903 2904 return Info.addFieldInitializer(Init); 2905} 2906 2907bool 2908Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2909 CXXCtorInitializer *Initializer) { 2910 assert(Initializer->isDelegatingInitializer()); 2911 Constructor->setNumCtorInitializers(1); 2912 CXXCtorInitializer **initializer = 2913 new (Context) CXXCtorInitializer*[1]; 2914 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2915 Constructor->setCtorInitializers(initializer); 2916 2917 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2918 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 2919 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2920 } 2921 2922 DelegatingCtorDecls.push_back(Constructor); 2923 2924 return false; 2925} 2926 2927bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2928 CXXCtorInitializer **Initializers, 2929 unsigned NumInitializers, 2930 bool AnyErrors) { 2931 if (Constructor->isDependentContext()) { 2932 // Just store the initializers as written, they will be checked during 2933 // instantiation. 2934 if (NumInitializers > 0) { 2935 Constructor->setNumCtorInitializers(NumInitializers); 2936 CXXCtorInitializer **baseOrMemberInitializers = 2937 new (Context) CXXCtorInitializer*[NumInitializers]; 2938 memcpy(baseOrMemberInitializers, Initializers, 2939 NumInitializers * sizeof(CXXCtorInitializer*)); 2940 Constructor->setCtorInitializers(baseOrMemberInitializers); 2941 } 2942 2943 return false; 2944 } 2945 2946 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2947 2948 // We need to build the initializer AST according to order of construction 2949 // and not what user specified in the Initializers list. 2950 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2951 if (!ClassDecl) 2952 return true; 2953 2954 bool HadError = false; 2955 2956 for (unsigned i = 0; i < NumInitializers; i++) { 2957 CXXCtorInitializer *Member = Initializers[i]; 2958 2959 if (Member->isBaseInitializer()) 2960 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2961 else 2962 Info.AllBaseFields[Member->getAnyMember()] = Member; 2963 } 2964 2965 // Keep track of the direct virtual bases. 2966 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2967 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2968 E = ClassDecl->bases_end(); I != E; ++I) { 2969 if (I->isVirtual()) 2970 DirectVBases.insert(I); 2971 } 2972 2973 // Push virtual bases before others. 2974 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2975 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2976 2977 if (CXXCtorInitializer *Value 2978 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2979 Info.AllToInit.push_back(Value); 2980 } else if (!AnyErrors) { 2981 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2982 CXXCtorInitializer *CXXBaseInit; 2983 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2984 VBase, IsInheritedVirtualBase, 2985 CXXBaseInit)) { 2986 HadError = true; 2987 continue; 2988 } 2989 2990 Info.AllToInit.push_back(CXXBaseInit); 2991 } 2992 } 2993 2994 // Non-virtual bases. 2995 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2996 E = ClassDecl->bases_end(); Base != E; ++Base) { 2997 // Virtuals are in the virtual base list and already constructed. 2998 if (Base->isVirtual()) 2999 continue; 3000 3001 if (CXXCtorInitializer *Value 3002 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 3003 Info.AllToInit.push_back(Value); 3004 } else if (!AnyErrors) { 3005 CXXCtorInitializer *CXXBaseInit; 3006 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3007 Base, /*IsInheritedVirtualBase=*/false, 3008 CXXBaseInit)) { 3009 HadError = true; 3010 continue; 3011 } 3012 3013 Info.AllToInit.push_back(CXXBaseInit); 3014 } 3015 } 3016 3017 // Fields. 3018 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 3019 MemEnd = ClassDecl->decls_end(); 3020 Mem != MemEnd; ++Mem) { 3021 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 3022 // C++ [class.bit]p2: 3023 // A declaration for a bit-field that omits the identifier declares an 3024 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 3025 // initialized. 3026 if (F->isUnnamedBitfield()) 3027 continue; 3028 3029 // If we're not generating the implicit copy/move constructor, then we'll 3030 // handle anonymous struct/union fields based on their individual 3031 // indirect fields. 3032 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 3033 continue; 3034 3035 if (CollectFieldInitializer(*this, Info, F)) 3036 HadError = true; 3037 continue; 3038 } 3039 3040 // Beyond this point, we only consider default initialization. 3041 if (Info.IIK != IIK_Default) 3042 continue; 3043 3044 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 3045 if (F->getType()->isIncompleteArrayType()) { 3046 assert(ClassDecl->hasFlexibleArrayMember() && 3047 "Incomplete array type is not valid"); 3048 continue; 3049 } 3050 3051 // Initialize each field of an anonymous struct individually. 3052 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 3053 HadError = true; 3054 3055 continue; 3056 } 3057 } 3058 3059 NumInitializers = Info.AllToInit.size(); 3060 if (NumInitializers > 0) { 3061 Constructor->setNumCtorInitializers(NumInitializers); 3062 CXXCtorInitializer **baseOrMemberInitializers = 3063 new (Context) CXXCtorInitializer*[NumInitializers]; 3064 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 3065 NumInitializers * sizeof(CXXCtorInitializer*)); 3066 Constructor->setCtorInitializers(baseOrMemberInitializers); 3067 3068 // Constructors implicitly reference the base and member 3069 // destructors. 3070 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 3071 Constructor->getParent()); 3072 } 3073 3074 return HadError; 3075} 3076 3077static void *GetKeyForTopLevelField(FieldDecl *Field) { 3078 // For anonymous unions, use the class declaration as the key. 3079 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 3080 if (RT->getDecl()->isAnonymousStructOrUnion()) 3081 return static_cast<void *>(RT->getDecl()); 3082 } 3083 return static_cast<void *>(Field); 3084} 3085 3086static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 3087 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 3088} 3089 3090static void *GetKeyForMember(ASTContext &Context, 3091 CXXCtorInitializer *Member) { 3092 if (!Member->isAnyMemberInitializer()) 3093 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3094 3095 // For fields injected into the class via declaration of an anonymous union, 3096 // use its anonymous union class declaration as the unique key. 3097 FieldDecl *Field = Member->getAnyMember(); 3098 3099 // If the field is a member of an anonymous struct or union, our key 3100 // is the anonymous record decl that's a direct child of the class. 3101 RecordDecl *RD = Field->getParent(); 3102 if (RD->isAnonymousStructOrUnion()) { 3103 while (true) { 3104 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 3105 if (Parent->isAnonymousStructOrUnion()) 3106 RD = Parent; 3107 else 3108 break; 3109 } 3110 3111 return static_cast<void *>(RD); 3112 } 3113 3114 return static_cast<void *>(Field); 3115} 3116 3117static void 3118DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 3119 const CXXConstructorDecl *Constructor, 3120 CXXCtorInitializer **Inits, 3121 unsigned NumInits) { 3122 if (Constructor->getDeclContext()->isDependentContext()) 3123 return; 3124 3125 // Don't check initializers order unless the warning is enabled at the 3126 // location of at least one initializer. 3127 bool ShouldCheckOrder = false; 3128 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3129 CXXCtorInitializer *Init = Inits[InitIndex]; 3130 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3131 Init->getSourceLocation()) 3132 != DiagnosticsEngine::Ignored) { 3133 ShouldCheckOrder = true; 3134 break; 3135 } 3136 } 3137 if (!ShouldCheckOrder) 3138 return; 3139 3140 // Build the list of bases and members in the order that they'll 3141 // actually be initialized. The explicit initializers should be in 3142 // this same order but may be missing things. 3143 SmallVector<const void*, 32> IdealInitKeys; 3144 3145 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3146 3147 // 1. Virtual bases. 3148 for (CXXRecordDecl::base_class_const_iterator VBase = 3149 ClassDecl->vbases_begin(), 3150 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3151 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3152 3153 // 2. Non-virtual bases. 3154 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3155 E = ClassDecl->bases_end(); Base != E; ++Base) { 3156 if (Base->isVirtual()) 3157 continue; 3158 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3159 } 3160 3161 // 3. Direct fields. 3162 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3163 E = ClassDecl->field_end(); Field != E; ++Field) { 3164 if (Field->isUnnamedBitfield()) 3165 continue; 3166 3167 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 3168 } 3169 3170 unsigned NumIdealInits = IdealInitKeys.size(); 3171 unsigned IdealIndex = 0; 3172 3173 CXXCtorInitializer *PrevInit = 0; 3174 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3175 CXXCtorInitializer *Init = Inits[InitIndex]; 3176 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3177 3178 // Scan forward to try to find this initializer in the idealized 3179 // initializers list. 3180 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3181 if (InitKey == IdealInitKeys[IdealIndex]) 3182 break; 3183 3184 // If we didn't find this initializer, it must be because we 3185 // scanned past it on a previous iteration. That can only 3186 // happen if we're out of order; emit a warning. 3187 if (IdealIndex == NumIdealInits && PrevInit) { 3188 Sema::SemaDiagnosticBuilder D = 3189 SemaRef.Diag(PrevInit->getSourceLocation(), 3190 diag::warn_initializer_out_of_order); 3191 3192 if (PrevInit->isAnyMemberInitializer()) 3193 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3194 else 3195 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3196 3197 if (Init->isAnyMemberInitializer()) 3198 D << 0 << Init->getAnyMember()->getDeclName(); 3199 else 3200 D << 1 << Init->getTypeSourceInfo()->getType(); 3201 3202 // Move back to the initializer's location in the ideal list. 3203 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3204 if (InitKey == IdealInitKeys[IdealIndex]) 3205 break; 3206 3207 assert(IdealIndex != NumIdealInits && 3208 "initializer not found in initializer list"); 3209 } 3210 3211 PrevInit = Init; 3212 } 3213} 3214 3215namespace { 3216bool CheckRedundantInit(Sema &S, 3217 CXXCtorInitializer *Init, 3218 CXXCtorInitializer *&PrevInit) { 3219 if (!PrevInit) { 3220 PrevInit = Init; 3221 return false; 3222 } 3223 3224 if (FieldDecl *Field = Init->getMember()) 3225 S.Diag(Init->getSourceLocation(), 3226 diag::err_multiple_mem_initialization) 3227 << Field->getDeclName() 3228 << Init->getSourceRange(); 3229 else { 3230 const Type *BaseClass = Init->getBaseClass(); 3231 assert(BaseClass && "neither field nor base"); 3232 S.Diag(Init->getSourceLocation(), 3233 diag::err_multiple_base_initialization) 3234 << QualType(BaseClass, 0) 3235 << Init->getSourceRange(); 3236 } 3237 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3238 << 0 << PrevInit->getSourceRange(); 3239 3240 return true; 3241} 3242 3243typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3244typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3245 3246bool CheckRedundantUnionInit(Sema &S, 3247 CXXCtorInitializer *Init, 3248 RedundantUnionMap &Unions) { 3249 FieldDecl *Field = Init->getAnyMember(); 3250 RecordDecl *Parent = Field->getParent(); 3251 NamedDecl *Child = Field; 3252 3253 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3254 if (Parent->isUnion()) { 3255 UnionEntry &En = Unions[Parent]; 3256 if (En.first && En.first != Child) { 3257 S.Diag(Init->getSourceLocation(), 3258 diag::err_multiple_mem_union_initialization) 3259 << Field->getDeclName() 3260 << Init->getSourceRange(); 3261 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3262 << 0 << En.second->getSourceRange(); 3263 return true; 3264 } 3265 if (!En.first) { 3266 En.first = Child; 3267 En.second = Init; 3268 } 3269 if (!Parent->isAnonymousStructOrUnion()) 3270 return false; 3271 } 3272 3273 Child = Parent; 3274 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3275 } 3276 3277 return false; 3278} 3279} 3280 3281/// ActOnMemInitializers - Handle the member initializers for a constructor. 3282void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3283 SourceLocation ColonLoc, 3284 CXXCtorInitializer **meminits, 3285 unsigned NumMemInits, 3286 bool AnyErrors) { 3287 if (!ConstructorDecl) 3288 return; 3289 3290 AdjustDeclIfTemplate(ConstructorDecl); 3291 3292 CXXConstructorDecl *Constructor 3293 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3294 3295 if (!Constructor) { 3296 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3297 return; 3298 } 3299 3300 CXXCtorInitializer **MemInits = 3301 reinterpret_cast<CXXCtorInitializer **>(meminits); 3302 3303 // Mapping for the duplicate initializers check. 3304 // For member initializers, this is keyed with a FieldDecl*. 3305 // For base initializers, this is keyed with a Type*. 3306 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3307 3308 // Mapping for the inconsistent anonymous-union initializers check. 3309 RedundantUnionMap MemberUnions; 3310 3311 bool HadError = false; 3312 for (unsigned i = 0; i < NumMemInits; i++) { 3313 CXXCtorInitializer *Init = MemInits[i]; 3314 3315 // Set the source order index. 3316 Init->setSourceOrder(i); 3317 3318 if (Init->isAnyMemberInitializer()) { 3319 FieldDecl *Field = Init->getAnyMember(); 3320 if (CheckRedundantInit(*this, Init, Members[Field]) || 3321 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3322 HadError = true; 3323 } else if (Init->isBaseInitializer()) { 3324 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3325 if (CheckRedundantInit(*this, Init, Members[Key])) 3326 HadError = true; 3327 } else { 3328 assert(Init->isDelegatingInitializer()); 3329 // This must be the only initializer 3330 if (i != 0 || NumMemInits > 1) { 3331 Diag(MemInits[0]->getSourceLocation(), 3332 diag::err_delegating_initializer_alone) 3333 << MemInits[0]->getSourceRange(); 3334 HadError = true; 3335 // We will treat this as being the only initializer. 3336 } 3337 SetDelegatingInitializer(Constructor, MemInits[i]); 3338 // Return immediately as the initializer is set. 3339 return; 3340 } 3341 } 3342 3343 if (HadError) 3344 return; 3345 3346 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3347 3348 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3349} 3350 3351void 3352Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3353 CXXRecordDecl *ClassDecl) { 3354 // Ignore dependent contexts. Also ignore unions, since their members never 3355 // have destructors implicitly called. 3356 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3357 return; 3358 3359 // FIXME: all the access-control diagnostics are positioned on the 3360 // field/base declaration. That's probably good; that said, the 3361 // user might reasonably want to know why the destructor is being 3362 // emitted, and we currently don't say. 3363 3364 // Non-static data members. 3365 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3366 E = ClassDecl->field_end(); I != E; ++I) { 3367 FieldDecl *Field = *I; 3368 if (Field->isInvalidDecl()) 3369 continue; 3370 3371 // Don't destroy incomplete or zero-length arrays. 3372 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3373 continue; 3374 3375 QualType FieldType = Context.getBaseElementType(Field->getType()); 3376 3377 const RecordType* RT = FieldType->getAs<RecordType>(); 3378 if (!RT) 3379 continue; 3380 3381 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3382 if (FieldClassDecl->isInvalidDecl()) 3383 continue; 3384 if (FieldClassDecl->hasIrrelevantDestructor()) 3385 continue; 3386 // The destructor for an implicit anonymous union member is never invoked. 3387 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) 3388 continue; 3389 3390 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3391 assert(Dtor && "No dtor found for FieldClassDecl!"); 3392 CheckDestructorAccess(Field->getLocation(), Dtor, 3393 PDiag(diag::err_access_dtor_field) 3394 << Field->getDeclName() 3395 << FieldType); 3396 3397 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3398 DiagnoseUseOfDecl(Dtor, Location); 3399 } 3400 3401 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3402 3403 // Bases. 3404 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3405 E = ClassDecl->bases_end(); Base != E; ++Base) { 3406 // Bases are always records in a well-formed non-dependent class. 3407 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3408 3409 // Remember direct virtual bases. 3410 if (Base->isVirtual()) 3411 DirectVirtualBases.insert(RT); 3412 3413 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3414 // If our base class is invalid, we probably can't get its dtor anyway. 3415 if (BaseClassDecl->isInvalidDecl()) 3416 continue; 3417 if (BaseClassDecl->hasIrrelevantDestructor()) 3418 continue; 3419 3420 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3421 assert(Dtor && "No dtor found for BaseClassDecl!"); 3422 3423 // FIXME: caret should be on the start of the class name 3424 CheckDestructorAccess(Base->getLocStart(), Dtor, 3425 PDiag(diag::err_access_dtor_base) 3426 << Base->getType() 3427 << Base->getSourceRange(), 3428 Context.getTypeDeclType(ClassDecl)); 3429 3430 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3431 DiagnoseUseOfDecl(Dtor, Location); 3432 } 3433 3434 // Virtual bases. 3435 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3436 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3437 3438 // Bases are always records in a well-formed non-dependent class. 3439 const RecordType *RT = VBase->getType()->castAs<RecordType>(); 3440 3441 // Ignore direct virtual bases. 3442 if (DirectVirtualBases.count(RT)) 3443 continue; 3444 3445 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3446 // If our base class is invalid, we probably can't get its dtor anyway. 3447 if (BaseClassDecl->isInvalidDecl()) 3448 continue; 3449 if (BaseClassDecl->hasIrrelevantDestructor()) 3450 continue; 3451 3452 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3453 assert(Dtor && "No dtor found for BaseClassDecl!"); 3454 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3455 PDiag(diag::err_access_dtor_vbase) 3456 << VBase->getType(), 3457 Context.getTypeDeclType(ClassDecl)); 3458 3459 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3460 DiagnoseUseOfDecl(Dtor, Location); 3461 } 3462} 3463 3464void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3465 if (!CDtorDecl) 3466 return; 3467 3468 if (CXXConstructorDecl *Constructor 3469 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3470 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3471} 3472 3473bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3474 unsigned DiagID, AbstractDiagSelID SelID) { 3475 class NonAbstractTypeDiagnoser : public TypeDiagnoser { 3476 unsigned DiagID; 3477 AbstractDiagSelID SelID; 3478 3479 public: 3480 NonAbstractTypeDiagnoser(unsigned DiagID, AbstractDiagSelID SelID) 3481 : TypeDiagnoser(DiagID == 0), DiagID(DiagID), SelID(SelID) { } 3482 3483 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 3484 if (Suppressed) return; 3485 if (SelID == -1) 3486 S.Diag(Loc, DiagID) << T; 3487 else 3488 S.Diag(Loc, DiagID) << SelID << T; 3489 } 3490 } Diagnoser(DiagID, SelID); 3491 3492 return RequireNonAbstractType(Loc, T, Diagnoser); 3493} 3494 3495bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3496 TypeDiagnoser &Diagnoser) { 3497 if (!getLangOpts().CPlusPlus) 3498 return false; 3499 3500 if (const ArrayType *AT = Context.getAsArrayType(T)) 3501 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3502 3503 if (const PointerType *PT = T->getAs<PointerType>()) { 3504 // Find the innermost pointer type. 3505 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3506 PT = T; 3507 3508 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3509 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3510 } 3511 3512 const RecordType *RT = T->getAs<RecordType>(); 3513 if (!RT) 3514 return false; 3515 3516 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3517 3518 // We can't answer whether something is abstract until it has a 3519 // definition. If it's currently being defined, we'll walk back 3520 // over all the declarations when we have a full definition. 3521 const CXXRecordDecl *Def = RD->getDefinition(); 3522 if (!Def || Def->isBeingDefined()) 3523 return false; 3524 3525 if (!RD->isAbstract()) 3526 return false; 3527 3528 Diagnoser.diagnose(*this, Loc, T); 3529 DiagnoseAbstractType(RD); 3530 3531 return true; 3532} 3533 3534void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3535 // Check if we've already emitted the list of pure virtual functions 3536 // for this class. 3537 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3538 return; 3539 3540 CXXFinalOverriderMap FinalOverriders; 3541 RD->getFinalOverriders(FinalOverriders); 3542 3543 // Keep a set of seen pure methods so we won't diagnose the same method 3544 // more than once. 3545 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3546 3547 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3548 MEnd = FinalOverriders.end(); 3549 M != MEnd; 3550 ++M) { 3551 for (OverridingMethods::iterator SO = M->second.begin(), 3552 SOEnd = M->second.end(); 3553 SO != SOEnd; ++SO) { 3554 // C++ [class.abstract]p4: 3555 // A class is abstract if it contains or inherits at least one 3556 // pure virtual function for which the final overrider is pure 3557 // virtual. 3558 3559 // 3560 if (SO->second.size() != 1) 3561 continue; 3562 3563 if (!SO->second.front().Method->isPure()) 3564 continue; 3565 3566 if (!SeenPureMethods.insert(SO->second.front().Method)) 3567 continue; 3568 3569 Diag(SO->second.front().Method->getLocation(), 3570 diag::note_pure_virtual_function) 3571 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3572 } 3573 } 3574 3575 if (!PureVirtualClassDiagSet) 3576 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3577 PureVirtualClassDiagSet->insert(RD); 3578} 3579 3580namespace { 3581struct AbstractUsageInfo { 3582 Sema &S; 3583 CXXRecordDecl *Record; 3584 CanQualType AbstractType; 3585 bool Invalid; 3586 3587 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3588 : S(S), Record(Record), 3589 AbstractType(S.Context.getCanonicalType( 3590 S.Context.getTypeDeclType(Record))), 3591 Invalid(false) {} 3592 3593 void DiagnoseAbstractType() { 3594 if (Invalid) return; 3595 S.DiagnoseAbstractType(Record); 3596 Invalid = true; 3597 } 3598 3599 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3600}; 3601 3602struct CheckAbstractUsage { 3603 AbstractUsageInfo &Info; 3604 const NamedDecl *Ctx; 3605 3606 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3607 : Info(Info), Ctx(Ctx) {} 3608 3609 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3610 switch (TL.getTypeLocClass()) { 3611#define ABSTRACT_TYPELOC(CLASS, PARENT) 3612#define TYPELOC(CLASS, PARENT) \ 3613 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3614#include "clang/AST/TypeLocNodes.def" 3615 } 3616 } 3617 3618 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3619 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3620 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3621 if (!TL.getArg(I)) 3622 continue; 3623 3624 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3625 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3626 } 3627 } 3628 3629 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3630 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3631 } 3632 3633 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3634 // Visit the type parameters from a permissive context. 3635 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3636 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3637 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3638 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3639 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3640 // TODO: other template argument types? 3641 } 3642 } 3643 3644 // Visit pointee types from a permissive context. 3645#define CheckPolymorphic(Type) \ 3646 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3647 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3648 } 3649 CheckPolymorphic(PointerTypeLoc) 3650 CheckPolymorphic(ReferenceTypeLoc) 3651 CheckPolymorphic(MemberPointerTypeLoc) 3652 CheckPolymorphic(BlockPointerTypeLoc) 3653 CheckPolymorphic(AtomicTypeLoc) 3654 3655 /// Handle all the types we haven't given a more specific 3656 /// implementation for above. 3657 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3658 // Every other kind of type that we haven't called out already 3659 // that has an inner type is either (1) sugar or (2) contains that 3660 // inner type in some way as a subobject. 3661 if (TypeLoc Next = TL.getNextTypeLoc()) 3662 return Visit(Next, Sel); 3663 3664 // If there's no inner type and we're in a permissive context, 3665 // don't diagnose. 3666 if (Sel == Sema::AbstractNone) return; 3667 3668 // Check whether the type matches the abstract type. 3669 QualType T = TL.getType(); 3670 if (T->isArrayType()) { 3671 Sel = Sema::AbstractArrayType; 3672 T = Info.S.Context.getBaseElementType(T); 3673 } 3674 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3675 if (CT != Info.AbstractType) return; 3676 3677 // It matched; do some magic. 3678 if (Sel == Sema::AbstractArrayType) { 3679 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3680 << T << TL.getSourceRange(); 3681 } else { 3682 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3683 << Sel << T << TL.getSourceRange(); 3684 } 3685 Info.DiagnoseAbstractType(); 3686 } 3687}; 3688 3689void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3690 Sema::AbstractDiagSelID Sel) { 3691 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3692} 3693 3694} 3695 3696/// Check for invalid uses of an abstract type in a method declaration. 3697static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3698 CXXMethodDecl *MD) { 3699 // No need to do the check on definitions, which require that 3700 // the return/param types be complete. 3701 if (MD->doesThisDeclarationHaveABody()) 3702 return; 3703 3704 // For safety's sake, just ignore it if we don't have type source 3705 // information. This should never happen for non-implicit methods, 3706 // but... 3707 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3708 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3709} 3710 3711/// Check for invalid uses of an abstract type within a class definition. 3712static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3713 CXXRecordDecl *RD) { 3714 for (CXXRecordDecl::decl_iterator 3715 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3716 Decl *D = *I; 3717 if (D->isImplicit()) continue; 3718 3719 // Methods and method templates. 3720 if (isa<CXXMethodDecl>(D)) { 3721 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3722 } else if (isa<FunctionTemplateDecl>(D)) { 3723 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3724 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3725 3726 // Fields and static variables. 3727 } else if (isa<FieldDecl>(D)) { 3728 FieldDecl *FD = cast<FieldDecl>(D); 3729 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3730 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3731 } else if (isa<VarDecl>(D)) { 3732 VarDecl *VD = cast<VarDecl>(D); 3733 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3734 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3735 3736 // Nested classes and class templates. 3737 } else if (isa<CXXRecordDecl>(D)) { 3738 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3739 } else if (isa<ClassTemplateDecl>(D)) { 3740 CheckAbstractClassUsage(Info, 3741 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3742 } 3743 } 3744} 3745 3746/// \brief Perform semantic checks on a class definition that has been 3747/// completing, introducing implicitly-declared members, checking for 3748/// abstract types, etc. 3749void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3750 if (!Record) 3751 return; 3752 3753 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3754 AbstractUsageInfo Info(*this, Record); 3755 CheckAbstractClassUsage(Info, Record); 3756 } 3757 3758 // If this is not an aggregate type and has no user-declared constructor, 3759 // complain about any non-static data members of reference or const scalar 3760 // type, since they will never get initializers. 3761 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3762 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 3763 !Record->isLambda()) { 3764 bool Complained = false; 3765 for (RecordDecl::field_iterator F = Record->field_begin(), 3766 FEnd = Record->field_end(); 3767 F != FEnd; ++F) { 3768 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3769 continue; 3770 3771 if (F->getType()->isReferenceType() || 3772 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3773 if (!Complained) { 3774 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3775 << Record->getTagKind() << Record; 3776 Complained = true; 3777 } 3778 3779 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3780 << F->getType()->isReferenceType() 3781 << F->getDeclName(); 3782 } 3783 } 3784 } 3785 3786 if (Record->isDynamicClass() && !Record->isDependentType()) 3787 DynamicClasses.push_back(Record); 3788 3789 if (Record->getIdentifier()) { 3790 // C++ [class.mem]p13: 3791 // If T is the name of a class, then each of the following shall have a 3792 // name different from T: 3793 // - every member of every anonymous union that is a member of class T. 3794 // 3795 // C++ [class.mem]p14: 3796 // In addition, if class T has a user-declared constructor (12.1), every 3797 // non-static data member of class T shall have a name different from T. 3798 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3799 R.first != R.second; ++R.first) { 3800 NamedDecl *D = *R.first; 3801 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3802 isa<IndirectFieldDecl>(D)) { 3803 Diag(D->getLocation(), diag::err_member_name_of_class) 3804 << D->getDeclName(); 3805 break; 3806 } 3807 } 3808 } 3809 3810 // Warn if the class has virtual methods but non-virtual public destructor. 3811 if (Record->isPolymorphic() && !Record->isDependentType()) { 3812 CXXDestructorDecl *dtor = Record->getDestructor(); 3813 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3814 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3815 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3816 } 3817 3818 // See if a method overloads virtual methods in a base 3819 /// class without overriding any. 3820 if (!Record->isDependentType()) { 3821 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3822 MEnd = Record->method_end(); 3823 M != MEnd; ++M) { 3824 if (!M->isStatic()) 3825 DiagnoseHiddenVirtualMethods(Record, *M); 3826 } 3827 } 3828 3829 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3830 // function that is not a constructor declares that member function to be 3831 // const. [...] The class of which that function is a member shall be 3832 // a literal type. 3833 // 3834 // If the class has virtual bases, any constexpr members will already have 3835 // been diagnosed by the checks performed on the member declaration, so 3836 // suppress this (less useful) diagnostic. 3837 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3838 !Record->isLiteral() && !Record->getNumVBases()) { 3839 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3840 MEnd = Record->method_end(); 3841 M != MEnd; ++M) { 3842 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 3843 switch (Record->getTemplateSpecializationKind()) { 3844 case TSK_ImplicitInstantiation: 3845 case TSK_ExplicitInstantiationDeclaration: 3846 case TSK_ExplicitInstantiationDefinition: 3847 // If a template instantiates to a non-literal type, but its members 3848 // instantiate to constexpr functions, the template is technically 3849 // ill-formed, but we allow it for sanity. 3850 continue; 3851 3852 case TSK_Undeclared: 3853 case TSK_ExplicitSpecialization: 3854 RequireLiteralType(M->getLocation(), Context.getRecordType(Record), 3855 diag::err_constexpr_method_non_literal); 3856 break; 3857 } 3858 3859 // Only produce one error per class. 3860 break; 3861 } 3862 } 3863 } 3864 3865 // Declare inherited constructors. We do this eagerly here because: 3866 // - The standard requires an eager diagnostic for conflicting inherited 3867 // constructors from different classes. 3868 // - The lazy declaration of the other implicit constructors is so as to not 3869 // waste space and performance on classes that are not meant to be 3870 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3871 // have inherited constructors. 3872 DeclareInheritedConstructors(Record); 3873} 3874 3875void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3876 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3877 ME = Record->method_end(); 3878 MI != ME; ++MI) 3879 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) 3880 CheckExplicitlyDefaultedSpecialMember(*MI); 3881} 3882 3883/// Is the special member function which would be selected to perform the 3884/// specified operation on the specified class type a constexpr constructor? 3885static bool specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 3886 Sema::CXXSpecialMember CSM, 3887 bool ConstArg) { 3888 Sema::SpecialMemberOverloadResult *SMOR = 3889 S.LookupSpecialMember(ClassDecl, CSM, ConstArg, 3890 false, false, false, false); 3891 if (!SMOR || !SMOR->getMethod()) 3892 // A constructor we wouldn't select can't be "involved in initializing" 3893 // anything. 3894 return true; 3895 return SMOR->getMethod()->isConstexpr(); 3896} 3897 3898/// Determine whether the specified special member function would be constexpr 3899/// if it were implicitly defined. 3900static bool defaultedSpecialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 3901 Sema::CXXSpecialMember CSM, 3902 bool ConstArg) { 3903 if (!S.getLangOpts().CPlusPlus0x) 3904 return false; 3905 3906 // C++11 [dcl.constexpr]p4: 3907 // In the definition of a constexpr constructor [...] 3908 switch (CSM) { 3909 case Sema::CXXDefaultConstructor: 3910 // Since default constructor lookup is essentially trivial (and cannot 3911 // involve, for instance, template instantiation), we compute whether a 3912 // defaulted default constructor is constexpr directly within CXXRecordDecl. 3913 // 3914 // This is important for performance; we need to know whether the default 3915 // constructor is constexpr to determine whether the type is a literal type. 3916 return ClassDecl->defaultedDefaultConstructorIsConstexpr(); 3917 3918 case Sema::CXXCopyConstructor: 3919 case Sema::CXXMoveConstructor: 3920 // For copy or move constructors, we need to perform overload resolution. 3921 break; 3922 3923 case Sema::CXXCopyAssignment: 3924 case Sema::CXXMoveAssignment: 3925 case Sema::CXXDestructor: 3926 case Sema::CXXInvalid: 3927 return false; 3928 } 3929 3930 // -- if the class is a non-empty union, or for each non-empty anonymous 3931 // union member of a non-union class, exactly one non-static data member 3932 // shall be initialized; [DR1359] 3933 // 3934 // If we squint, this is guaranteed, since exactly one non-static data member 3935 // will be initialized (if the constructor isn't deleted), we just don't know 3936 // which one. 3937 if (ClassDecl->isUnion()) 3938 return true; 3939 3940 // -- the class shall not have any virtual base classes; 3941 if (ClassDecl->getNumVBases()) 3942 return false; 3943 3944 // -- every constructor involved in initializing [...] base class 3945 // sub-objects shall be a constexpr constructor; 3946 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 3947 BEnd = ClassDecl->bases_end(); 3948 B != BEnd; ++B) { 3949 const RecordType *BaseType = B->getType()->getAs<RecordType>(); 3950 if (!BaseType) continue; 3951 3952 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 3953 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, ConstArg)) 3954 return false; 3955 } 3956 3957 // -- every constructor involved in initializing non-static data members 3958 // [...] shall be a constexpr constructor; 3959 // -- every non-static data member and base class sub-object shall be 3960 // initialized 3961 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 3962 FEnd = ClassDecl->field_end(); 3963 F != FEnd; ++F) { 3964 if (F->isInvalidDecl()) 3965 continue; 3966 if (const RecordType *RecordTy = 3967 S.Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 3968 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 3969 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, ConstArg)) 3970 return false; 3971 } 3972 } 3973 3974 // All OK, it's constexpr! 3975 return true; 3976} 3977 3978static Sema::ImplicitExceptionSpecification 3979computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, CXXMethodDecl *MD) { 3980 switch (S.getSpecialMember(MD)) { 3981 case Sema::CXXDefaultConstructor: 3982 return S.ComputeDefaultedDefaultCtorExceptionSpec(Loc, MD); 3983 case Sema::CXXCopyConstructor: 3984 return S.ComputeDefaultedCopyCtorExceptionSpec(MD); 3985 case Sema::CXXCopyAssignment: 3986 return S.ComputeDefaultedCopyAssignmentExceptionSpec(MD); 3987 case Sema::CXXMoveConstructor: 3988 return S.ComputeDefaultedMoveCtorExceptionSpec(MD); 3989 case Sema::CXXMoveAssignment: 3990 return S.ComputeDefaultedMoveAssignmentExceptionSpec(MD); 3991 case Sema::CXXDestructor: 3992 return S.ComputeDefaultedDtorExceptionSpec(MD); 3993 case Sema::CXXInvalid: 3994 break; 3995 } 3996 llvm_unreachable("only special members have implicit exception specs"); 3997} 3998 3999static void 4000updateExceptionSpec(Sema &S, FunctionDecl *FD, const FunctionProtoType *FPT, 4001 const Sema::ImplicitExceptionSpecification &ExceptSpec) { 4002 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4003 ExceptSpec.getEPI(EPI); 4004 const FunctionProtoType *NewFPT = cast<FunctionProtoType>( 4005 S.Context.getFunctionType(FPT->getResultType(), FPT->arg_type_begin(), 4006 FPT->getNumArgs(), EPI)); 4007 FD->setType(QualType(NewFPT, 0)); 4008} 4009 4010void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD) { 4011 const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>(); 4012 if (FPT->getExceptionSpecType() != EST_Unevaluated) 4013 return; 4014 4015 // Evaluate the exception specification. 4016 ImplicitExceptionSpecification ExceptSpec = 4017 computeImplicitExceptionSpec(*this, Loc, MD); 4018 4019 // Update the type of the special member to use it. 4020 updateExceptionSpec(*this, MD, FPT, ExceptSpec); 4021 4022 // A user-provided destructor can be defined outside the class. When that 4023 // happens, be sure to update the exception specification on both 4024 // declarations. 4025 const FunctionProtoType *CanonicalFPT = 4026 MD->getCanonicalDecl()->getType()->castAs<FunctionProtoType>(); 4027 if (CanonicalFPT->getExceptionSpecType() == EST_Unevaluated) 4028 updateExceptionSpec(*this, MD->getCanonicalDecl(), 4029 CanonicalFPT, ExceptSpec); 4030} 4031 4032static bool isImplicitCopyCtorArgConst(Sema &S, CXXRecordDecl *ClassDecl); 4033static bool isImplicitCopyAssignmentArgConst(Sema &S, CXXRecordDecl *ClassDecl); 4034 4035void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) { 4036 CXXRecordDecl *RD = MD->getParent(); 4037 CXXSpecialMember CSM = getSpecialMember(MD); 4038 4039 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid && 4040 "not an explicitly-defaulted special member"); 4041 4042 // Whether this was the first-declared instance of the constructor. 4043 // This affects whether we implicitly add an exception spec and constexpr. 4044 bool First = MD == MD->getCanonicalDecl(); 4045 4046 bool HadError = false; 4047 4048 // C++11 [dcl.fct.def.default]p1: 4049 // A function that is explicitly defaulted shall 4050 // -- be a special member function (checked elsewhere), 4051 // -- have the same type (except for ref-qualifiers, and except that a 4052 // copy operation can take a non-const reference) as an implicit 4053 // declaration, and 4054 // -- not have default arguments. 4055 unsigned ExpectedParams = 1; 4056 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor) 4057 ExpectedParams = 0; 4058 if (MD->getNumParams() != ExpectedParams) { 4059 // This also checks for default arguments: a copy or move constructor with a 4060 // default argument is classified as a default constructor, and assignment 4061 // operations and destructors can't have default arguments. 4062 Diag(MD->getLocation(), diag::err_defaulted_special_member_params) 4063 << CSM << MD->getSourceRange(); 4064 HadError = true; 4065 } 4066 4067 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>(); 4068 4069 // Compute argument constness, constexpr, and triviality. 4070 bool CanHaveConstParam = false; 4071 bool Trivial; 4072 switch (CSM) { 4073 case CXXDefaultConstructor: 4074 Trivial = RD->hasTrivialDefaultConstructor(); 4075 break; 4076 case CXXCopyConstructor: 4077 CanHaveConstParam = isImplicitCopyCtorArgConst(*this, RD); 4078 Trivial = RD->hasTrivialCopyConstructor(); 4079 break; 4080 case CXXCopyAssignment: 4081 CanHaveConstParam = isImplicitCopyAssignmentArgConst(*this, RD); 4082 Trivial = RD->hasTrivialCopyAssignment(); 4083 break; 4084 case CXXMoveConstructor: 4085 Trivial = RD->hasTrivialMoveConstructor(); 4086 break; 4087 case CXXMoveAssignment: 4088 Trivial = RD->hasTrivialMoveAssignment(); 4089 break; 4090 case CXXDestructor: 4091 Trivial = RD->hasTrivialDestructor(); 4092 break; 4093 case CXXInvalid: 4094 llvm_unreachable("non-special member explicitly defaulted!"); 4095 } 4096 4097 QualType ReturnType = Context.VoidTy; 4098 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) { 4099 // Check for return type matching. 4100 ReturnType = Type->getResultType(); 4101 QualType ExpectedReturnType = 4102 Context.getLValueReferenceType(Context.getTypeDeclType(RD)); 4103 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) { 4104 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type) 4105 << (CSM == CXXMoveAssignment) << ExpectedReturnType; 4106 HadError = true; 4107 } 4108 4109 // A defaulted special member cannot have cv-qualifiers. 4110 if (Type->getTypeQuals()) { 4111 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals) 4112 << (CSM == CXXMoveAssignment); 4113 HadError = true; 4114 } 4115 } 4116 4117 // Check for parameter type matching. 4118 QualType ArgType = ExpectedParams ? Type->getArgType(0) : QualType(); 4119 bool HasConstParam = false; 4120 if (ExpectedParams && ArgType->isReferenceType()) { 4121 // Argument must be reference to possibly-const T. 4122 QualType ReferentType = ArgType->getPointeeType(); 4123 HasConstParam = ReferentType.isConstQualified(); 4124 4125 if (ReferentType.isVolatileQualified()) { 4126 Diag(MD->getLocation(), 4127 diag::err_defaulted_special_member_volatile_param) << CSM; 4128 HadError = true; 4129 } 4130 4131 if (HasConstParam && !CanHaveConstParam) { 4132 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) { 4133 Diag(MD->getLocation(), 4134 diag::err_defaulted_special_member_copy_const_param) 4135 << (CSM == CXXCopyAssignment); 4136 // FIXME: Explain why this special member can't be const. 4137 } else { 4138 Diag(MD->getLocation(), 4139 diag::err_defaulted_special_member_move_const_param) 4140 << (CSM == CXXMoveAssignment); 4141 } 4142 HadError = true; 4143 } 4144 4145 // If a function is explicitly defaulted on its first declaration, it shall 4146 // have the same parameter type as if it had been implicitly declared. 4147 // (Presumably this is to prevent it from being trivial?) 4148 if (!HasConstParam && CanHaveConstParam && First) 4149 Diag(MD->getLocation(), 4150 diag::err_defaulted_special_member_copy_non_const_param) 4151 << (CSM == CXXCopyAssignment); 4152 } else if (ExpectedParams) { 4153 // A copy assignment operator can take its argument by value, but a 4154 // defaulted one cannot. 4155 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument"); 4156 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4157 HadError = true; 4158 } 4159 4160 // Rebuild the type with the implicit exception specification added, if we 4161 // are going to need it. 4162 const FunctionProtoType *ImplicitType = 0; 4163 if (First || Type->hasExceptionSpec()) { 4164 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo(); 4165 computeImplicitExceptionSpec(*this, MD->getLocation(), MD).getEPI(EPI); 4166 ImplicitType = cast<FunctionProtoType>( 4167 Context.getFunctionType(ReturnType, &ArgType, ExpectedParams, EPI)); 4168 } 4169 4170 // C++11 [dcl.fct.def.default]p2: 4171 // An explicitly-defaulted function may be declared constexpr only if it 4172 // would have been implicitly declared as constexpr, 4173 // Do not apply this rule to members of class templates, since core issue 1358 4174 // makes such functions always instantiate to constexpr functions. For 4175 // non-constructors, this is checked elsewhere. 4176 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM, 4177 HasConstParam); 4178 if (isa<CXXConstructorDecl>(MD) && MD->isConstexpr() && !Constexpr && 4179 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4180 Diag(MD->getLocStart(), diag::err_incorrect_defaulted_constexpr) << CSM; 4181 // FIXME: Explain why the constructor can't be constexpr. 4182 HadError = true; 4183 } 4184 // and may have an explicit exception-specification only if it is compatible 4185 // with the exception-specification on the implicit declaration. 4186 if (Type->hasExceptionSpec() && 4187 CheckEquivalentExceptionSpec( 4188 PDiag(diag::err_incorrect_defaulted_exception_spec) << CSM, 4189 PDiag(), ImplicitType, SourceLocation(), Type, MD->getLocation())) 4190 HadError = true; 4191 4192 // If a function is explicitly defaulted on its first declaration, 4193 if (First) { 4194 // -- it is implicitly considered to be constexpr if the implicit 4195 // definition would be, 4196 MD->setConstexpr(Constexpr); 4197 4198 // -- it is implicitly considered to have the same exception-specification 4199 // as if it had been implicitly declared, 4200 MD->setType(QualType(ImplicitType, 0)); 4201 4202 // Such a function is also trivial if the implicitly-declared function 4203 // would have been. 4204 MD->setTrivial(Trivial); 4205 } 4206 4207 if (ShouldDeleteSpecialMember(MD, CSM)) { 4208 if (First) { 4209 MD->setDeletedAsWritten(); 4210 } else { 4211 // C++11 [dcl.fct.def.default]p4: 4212 // [For a] user-provided explicitly-defaulted function [...] if such a 4213 // function is implicitly defined as deleted, the program is ill-formed. 4214 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM; 4215 HadError = true; 4216 } 4217 } 4218 4219 if (HadError) 4220 MD->setInvalidDecl(); 4221} 4222 4223namespace { 4224struct SpecialMemberDeletionInfo { 4225 Sema &S; 4226 CXXMethodDecl *MD; 4227 Sema::CXXSpecialMember CSM; 4228 bool Diagnose; 4229 4230 // Properties of the special member, computed for convenience. 4231 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4232 SourceLocation Loc; 4233 4234 bool AllFieldsAreConst; 4235 4236 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4237 Sema::CXXSpecialMember CSM, bool Diagnose) 4238 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose), 4239 IsConstructor(false), IsAssignment(false), IsMove(false), 4240 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4241 AllFieldsAreConst(true) { 4242 switch (CSM) { 4243 case Sema::CXXDefaultConstructor: 4244 case Sema::CXXCopyConstructor: 4245 IsConstructor = true; 4246 break; 4247 case Sema::CXXMoveConstructor: 4248 IsConstructor = true; 4249 IsMove = true; 4250 break; 4251 case Sema::CXXCopyAssignment: 4252 IsAssignment = true; 4253 break; 4254 case Sema::CXXMoveAssignment: 4255 IsAssignment = true; 4256 IsMove = true; 4257 break; 4258 case Sema::CXXDestructor: 4259 break; 4260 case Sema::CXXInvalid: 4261 llvm_unreachable("invalid special member kind"); 4262 } 4263 4264 if (MD->getNumParams()) { 4265 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4266 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4267 } 4268 } 4269 4270 bool inUnion() const { return MD->getParent()->isUnion(); } 4271 4272 /// Look up the corresponding special member in the given class. 4273 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class, 4274 unsigned Quals) { 4275 unsigned TQ = MD->getTypeQualifiers(); 4276 // cv-qualifiers on class members don't affect default ctor / dtor calls. 4277 if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor) 4278 Quals = 0; 4279 return S.LookupSpecialMember(Class, CSM, 4280 ConstArg || (Quals & Qualifiers::Const), 4281 VolatileArg || (Quals & Qualifiers::Volatile), 4282 MD->getRefQualifier() == RQ_RValue, 4283 TQ & Qualifiers::Const, 4284 TQ & Qualifiers::Volatile); 4285 } 4286 4287 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; 4288 4289 bool shouldDeleteForBase(CXXBaseSpecifier *Base); 4290 bool shouldDeleteForField(FieldDecl *FD); 4291 bool shouldDeleteForAllConstMembers(); 4292 4293 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj, 4294 unsigned Quals); 4295 bool shouldDeleteForSubobjectCall(Subobject Subobj, 4296 Sema::SpecialMemberOverloadResult *SMOR, 4297 bool IsDtorCallInCtor); 4298 4299 bool isAccessible(Subobject Subobj, CXXMethodDecl *D); 4300}; 4301} 4302 4303/// Is the given special member inaccessible when used on the given 4304/// sub-object. 4305bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, 4306 CXXMethodDecl *target) { 4307 /// If we're operating on a base class, the object type is the 4308 /// type of this special member. 4309 QualType objectTy; 4310 AccessSpecifier access = target->getAccess();; 4311 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { 4312 objectTy = S.Context.getTypeDeclType(MD->getParent()); 4313 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); 4314 4315 // If we're operating on a field, the object type is the type of the field. 4316 } else { 4317 objectTy = S.Context.getTypeDeclType(target->getParent()); 4318 } 4319 4320 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy); 4321} 4322 4323/// Check whether we should delete a special member due to the implicit 4324/// definition containing a call to a special member of a subobject. 4325bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( 4326 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR, 4327 bool IsDtorCallInCtor) { 4328 CXXMethodDecl *Decl = SMOR->getMethod(); 4329 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4330 4331 int DiagKind = -1; 4332 4333 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) 4334 DiagKind = !Decl ? 0 : 1; 4335 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4336 DiagKind = 2; 4337 else if (!isAccessible(Subobj, Decl)) 4338 DiagKind = 3; 4339 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && 4340 !Decl->isTrivial()) { 4341 // A member of a union must have a trivial corresponding special member. 4342 // As a weird special case, a destructor call from a union's constructor 4343 // must be accessible and non-deleted, but need not be trivial. Such a 4344 // destructor is never actually called, but is semantically checked as 4345 // if it were. 4346 DiagKind = 4; 4347 } 4348 4349 if (DiagKind == -1) 4350 return false; 4351 4352 if (Diagnose) { 4353 if (Field) { 4354 S.Diag(Field->getLocation(), 4355 diag::note_deleted_special_member_class_subobject) 4356 << CSM << MD->getParent() << /*IsField*/true 4357 << Field << DiagKind << IsDtorCallInCtor; 4358 } else { 4359 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); 4360 S.Diag(Base->getLocStart(), 4361 diag::note_deleted_special_member_class_subobject) 4362 << CSM << MD->getParent() << /*IsField*/false 4363 << Base->getType() << DiagKind << IsDtorCallInCtor; 4364 } 4365 4366 if (DiagKind == 1) 4367 S.NoteDeletedFunction(Decl); 4368 // FIXME: Explain inaccessibility if DiagKind == 3. 4369 } 4370 4371 return true; 4372} 4373 4374/// Check whether we should delete a special member function due to having a 4375/// direct or virtual base class or non-static data member of class type M. 4376bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 4377 CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) { 4378 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4379 4380 // C++11 [class.ctor]p5: 4381 // -- any direct or virtual base class, or non-static data member with no 4382 // brace-or-equal-initializer, has class type M (or array thereof) and 4383 // either M has no default constructor or overload resolution as applied 4384 // to M's default constructor results in an ambiguity or in a function 4385 // that is deleted or inaccessible 4386 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4387 // -- a direct or virtual base class B that cannot be copied/moved because 4388 // overload resolution, as applied to B's corresponding special member, 4389 // results in an ambiguity or a function that is deleted or inaccessible 4390 // from the defaulted special member 4391 // C++11 [class.dtor]p5: 4392 // -- any direct or virtual base class [...] has a type with a destructor 4393 // that is deleted or inaccessible 4394 if (!(CSM == Sema::CXXDefaultConstructor && 4395 Field && Field->hasInClassInitializer()) && 4396 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals), false)) 4397 return true; 4398 4399 // C++11 [class.ctor]p5, C++11 [class.copy]p11: 4400 // -- any direct or virtual base class or non-static data member has a 4401 // type with a destructor that is deleted or inaccessible 4402 if (IsConstructor) { 4403 Sema::SpecialMemberOverloadResult *SMOR = 4404 S.LookupSpecialMember(Class, Sema::CXXDestructor, 4405 false, false, false, false, false); 4406 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) 4407 return true; 4408 } 4409 4410 return false; 4411} 4412 4413/// Check whether we should delete a special member function due to the class 4414/// having a particular direct or virtual base class. 4415bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { 4416 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); 4417 return shouldDeleteForClassSubobject(BaseClass, Base, 0); 4418} 4419 4420/// Check whether we should delete a special member function due to the class 4421/// having a particular non-static data member. 4422bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4423 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4424 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4425 4426 if (CSM == Sema::CXXDefaultConstructor) { 4427 // For a default constructor, all references must be initialized in-class 4428 // and, if a union, it must have a non-const member. 4429 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { 4430 if (Diagnose) 4431 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4432 << MD->getParent() << FD << FieldType << /*Reference*/0; 4433 return true; 4434 } 4435 // C++11 [class.ctor]p5: any non-variant non-static data member of 4436 // const-qualified type (or array thereof) with no 4437 // brace-or-equal-initializer does not have a user-provided default 4438 // constructor. 4439 if (!inUnion() && FieldType.isConstQualified() && 4440 !FD->hasInClassInitializer() && 4441 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { 4442 if (Diagnose) 4443 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4444 << MD->getParent() << FD << FD->getType() << /*Const*/1; 4445 return true; 4446 } 4447 4448 if (inUnion() && !FieldType.isConstQualified()) 4449 AllFieldsAreConst = false; 4450 } else if (CSM == Sema::CXXCopyConstructor) { 4451 // For a copy constructor, data members must not be of rvalue reference 4452 // type. 4453 if (FieldType->isRValueReferenceType()) { 4454 if (Diagnose) 4455 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) 4456 << MD->getParent() << FD << FieldType; 4457 return true; 4458 } 4459 } else if (IsAssignment) { 4460 // For an assignment operator, data members must not be of reference type. 4461 if (FieldType->isReferenceType()) { 4462 if (Diagnose) 4463 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4464 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0; 4465 return true; 4466 } 4467 if (!FieldRecord && FieldType.isConstQualified()) { 4468 // C++11 [class.copy]p23: 4469 // -- a non-static data member of const non-class type (or array thereof) 4470 if (Diagnose) 4471 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4472 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1; 4473 return true; 4474 } 4475 } 4476 4477 if (FieldRecord) { 4478 // Some additional restrictions exist on the variant members. 4479 if (!inUnion() && FieldRecord->isUnion() && 4480 FieldRecord->isAnonymousStructOrUnion()) { 4481 bool AllVariantFieldsAreConst = true; 4482 4483 // FIXME: Handle anonymous unions declared within anonymous unions. 4484 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4485 UE = FieldRecord->field_end(); 4486 UI != UE; ++UI) { 4487 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4488 4489 if (!UnionFieldType.isConstQualified()) 4490 AllVariantFieldsAreConst = false; 4491 4492 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 4493 if (UnionFieldRecord && 4494 shouldDeleteForClassSubobject(UnionFieldRecord, *UI, 4495 UnionFieldType.getCVRQualifiers())) 4496 return true; 4497 } 4498 4499 // At least one member in each anonymous union must be non-const 4500 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 4501 FieldRecord->field_begin() != FieldRecord->field_end()) { 4502 if (Diagnose) 4503 S.Diag(FieldRecord->getLocation(), 4504 diag::note_deleted_default_ctor_all_const) 4505 << MD->getParent() << /*anonymous union*/1; 4506 return true; 4507 } 4508 4509 // Don't check the implicit member of the anonymous union type. 4510 // This is technically non-conformant, but sanity demands it. 4511 return false; 4512 } 4513 4514 if (shouldDeleteForClassSubobject(FieldRecord, FD, 4515 FieldType.getCVRQualifiers())) 4516 return true; 4517 } 4518 4519 return false; 4520} 4521 4522/// C++11 [class.ctor] p5: 4523/// A defaulted default constructor for a class X is defined as deleted if 4524/// X is a union and all of its variant members are of const-qualified type. 4525bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4526 // This is a silly definition, because it gives an empty union a deleted 4527 // default constructor. Don't do that. 4528 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 4529 (MD->getParent()->field_begin() != MD->getParent()->field_end())) { 4530 if (Diagnose) 4531 S.Diag(MD->getParent()->getLocation(), 4532 diag::note_deleted_default_ctor_all_const) 4533 << MD->getParent() << /*not anonymous union*/0; 4534 return true; 4535 } 4536 return false; 4537} 4538 4539/// Determine whether a defaulted special member function should be defined as 4540/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4541/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4542bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, 4543 bool Diagnose) { 4544 if (MD->isInvalidDecl()) 4545 return false; 4546 CXXRecordDecl *RD = MD->getParent(); 4547 assert(!RD->isDependentType() && "do deletion after instantiation"); 4548 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4549 return false; 4550 4551 // C++11 [expr.lambda.prim]p19: 4552 // The closure type associated with a lambda-expression has a 4553 // deleted (8.4.3) default constructor and a deleted copy 4554 // assignment operator. 4555 if (RD->isLambda() && 4556 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { 4557 if (Diagnose) 4558 Diag(RD->getLocation(), diag::note_lambda_decl); 4559 return true; 4560 } 4561 4562 // For an anonymous struct or union, the copy and assignment special members 4563 // will never be used, so skip the check. For an anonymous union declared at 4564 // namespace scope, the constructor and destructor are used. 4565 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4566 RD->isAnonymousStructOrUnion()) 4567 return false; 4568 4569 // C++11 [class.copy]p7, p18: 4570 // If the class definition declares a move constructor or move assignment 4571 // operator, an implicitly declared copy constructor or copy assignment 4572 // operator is defined as deleted. 4573 if (MD->isImplicit() && 4574 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { 4575 CXXMethodDecl *UserDeclaredMove = 0; 4576 4577 // In Microsoft mode, a user-declared move only causes the deletion of the 4578 // corresponding copy operation, not both copy operations. 4579 if (RD->hasUserDeclaredMoveConstructor() && 4580 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) { 4581 if (!Diagnose) return true; 4582 UserDeclaredMove = RD->getMoveConstructor(); 4583 assert(UserDeclaredMove); 4584 } else if (RD->hasUserDeclaredMoveAssignment() && 4585 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) { 4586 if (!Diagnose) return true; 4587 UserDeclaredMove = RD->getMoveAssignmentOperator(); 4588 assert(UserDeclaredMove); 4589 } 4590 4591 if (UserDeclaredMove) { 4592 Diag(UserDeclaredMove->getLocation(), 4593 diag::note_deleted_copy_user_declared_move) 4594 << (CSM == CXXCopyAssignment) << RD 4595 << UserDeclaredMove->isMoveAssignmentOperator(); 4596 return true; 4597 } 4598 } 4599 4600 // Do access control from the special member function 4601 ContextRAII MethodContext(*this, MD); 4602 4603 // C++11 [class.dtor]p5: 4604 // -- for a virtual destructor, lookup of the non-array deallocation function 4605 // results in an ambiguity or in a function that is deleted or inaccessible 4606 if (CSM == CXXDestructor && MD->isVirtual()) { 4607 FunctionDecl *OperatorDelete = 0; 4608 DeclarationName Name = 4609 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4610 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 4611 OperatorDelete, false)) { 4612 if (Diagnose) 4613 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); 4614 return true; 4615 } 4616 } 4617 4618 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose); 4619 4620 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4621 BE = RD->bases_end(); BI != BE; ++BI) 4622 if (!BI->isVirtual() && 4623 SMI.shouldDeleteForBase(BI)) 4624 return true; 4625 4626 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4627 BE = RD->vbases_end(); BI != BE; ++BI) 4628 if (SMI.shouldDeleteForBase(BI)) 4629 return true; 4630 4631 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4632 FE = RD->field_end(); FI != FE; ++FI) 4633 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 4634 SMI.shouldDeleteForField(*FI)) 4635 return true; 4636 4637 if (SMI.shouldDeleteForAllConstMembers()) 4638 return true; 4639 4640 return false; 4641} 4642 4643/// \brief Data used with FindHiddenVirtualMethod 4644namespace { 4645 struct FindHiddenVirtualMethodData { 4646 Sema *S; 4647 CXXMethodDecl *Method; 4648 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4649 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4650 }; 4651} 4652 4653/// \brief Member lookup function that determines whether a given C++ 4654/// method overloads virtual methods in a base class without overriding any, 4655/// to be used with CXXRecordDecl::lookupInBases(). 4656static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4657 CXXBasePath &Path, 4658 void *UserData) { 4659 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4660 4661 FindHiddenVirtualMethodData &Data 4662 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4663 4664 DeclarationName Name = Data.Method->getDeclName(); 4665 assert(Name.getNameKind() == DeclarationName::Identifier); 4666 4667 bool foundSameNameMethod = false; 4668 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4669 for (Path.Decls = BaseRecord->lookup(Name); 4670 Path.Decls.first != Path.Decls.second; 4671 ++Path.Decls.first) { 4672 NamedDecl *D = *Path.Decls.first; 4673 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4674 MD = MD->getCanonicalDecl(); 4675 foundSameNameMethod = true; 4676 // Interested only in hidden virtual methods. 4677 if (!MD->isVirtual()) 4678 continue; 4679 // If the method we are checking overrides a method from its base 4680 // don't warn about the other overloaded methods. 4681 if (!Data.S->IsOverload(Data.Method, MD, false)) 4682 return true; 4683 // Collect the overload only if its hidden. 4684 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4685 overloadedMethods.push_back(MD); 4686 } 4687 } 4688 4689 if (foundSameNameMethod) 4690 Data.OverloadedMethods.append(overloadedMethods.begin(), 4691 overloadedMethods.end()); 4692 return foundSameNameMethod; 4693} 4694 4695/// \brief See if a method overloads virtual methods in a base class without 4696/// overriding any. 4697void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4698 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4699 MD->getLocation()) == DiagnosticsEngine::Ignored) 4700 return; 4701 if (!MD->getDeclName().isIdentifier()) 4702 return; 4703 4704 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4705 /*bool RecordPaths=*/false, 4706 /*bool DetectVirtual=*/false); 4707 FindHiddenVirtualMethodData Data; 4708 Data.Method = MD; 4709 Data.S = this; 4710 4711 // Keep the base methods that were overriden or introduced in the subclass 4712 // by 'using' in a set. A base method not in this set is hidden. 4713 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4714 res.first != res.second; ++res.first) { 4715 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4716 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4717 E = MD->end_overridden_methods(); 4718 I != E; ++I) 4719 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4720 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4721 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4722 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4723 } 4724 4725 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4726 !Data.OverloadedMethods.empty()) { 4727 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4728 << MD << (Data.OverloadedMethods.size() > 1); 4729 4730 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4731 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4732 Diag(overloadedMD->getLocation(), 4733 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4734 } 4735 } 4736} 4737 4738void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4739 Decl *TagDecl, 4740 SourceLocation LBrac, 4741 SourceLocation RBrac, 4742 AttributeList *AttrList) { 4743 if (!TagDecl) 4744 return; 4745 4746 AdjustDeclIfTemplate(TagDecl); 4747 4748 for (const AttributeList* l = AttrList; l; l = l->getNext()) { 4749 if (l->getKind() != AttributeList::AT_Visibility) 4750 continue; 4751 l->setInvalid(); 4752 Diag(l->getLoc(), diag::warn_attribute_after_definition_ignored) << 4753 l->getName(); 4754 } 4755 4756 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4757 // strict aliasing violation! 4758 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4759 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4760 4761 CheckCompletedCXXClass( 4762 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4763} 4764 4765/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4766/// special functions, such as the default constructor, copy 4767/// constructor, or destructor, to the given C++ class (C++ 4768/// [special]p1). This routine can only be executed just before the 4769/// definition of the class is complete. 4770void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4771 if (!ClassDecl->hasUserDeclaredConstructor()) 4772 ++ASTContext::NumImplicitDefaultConstructors; 4773 4774 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4775 ++ASTContext::NumImplicitCopyConstructors; 4776 4777 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 4778 ++ASTContext::NumImplicitMoveConstructors; 4779 4780 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4781 ++ASTContext::NumImplicitCopyAssignmentOperators; 4782 4783 // If we have a dynamic class, then the copy assignment operator may be 4784 // virtual, so we have to declare it immediately. This ensures that, e.g., 4785 // it shows up in the right place in the vtable and that we diagnose 4786 // problems with the implicit exception specification. 4787 if (ClassDecl->isDynamicClass()) 4788 DeclareImplicitCopyAssignment(ClassDecl); 4789 } 4790 4791 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()) { 4792 ++ASTContext::NumImplicitMoveAssignmentOperators; 4793 4794 // Likewise for the move assignment operator. 4795 if (ClassDecl->isDynamicClass()) 4796 DeclareImplicitMoveAssignment(ClassDecl); 4797 } 4798 4799 if (!ClassDecl->hasUserDeclaredDestructor()) { 4800 ++ASTContext::NumImplicitDestructors; 4801 4802 // If we have a dynamic class, then the destructor may be virtual, so we 4803 // have to declare the destructor immediately. This ensures that, e.g., it 4804 // shows up in the right place in the vtable and that we diagnose problems 4805 // with the implicit exception specification. 4806 if (ClassDecl->isDynamicClass()) 4807 DeclareImplicitDestructor(ClassDecl); 4808 } 4809} 4810 4811void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4812 if (!D) 4813 return; 4814 4815 int NumParamList = D->getNumTemplateParameterLists(); 4816 for (int i = 0; i < NumParamList; i++) { 4817 TemplateParameterList* Params = D->getTemplateParameterList(i); 4818 for (TemplateParameterList::iterator Param = Params->begin(), 4819 ParamEnd = Params->end(); 4820 Param != ParamEnd; ++Param) { 4821 NamedDecl *Named = cast<NamedDecl>(*Param); 4822 if (Named->getDeclName()) { 4823 S->AddDecl(Named); 4824 IdResolver.AddDecl(Named); 4825 } 4826 } 4827 } 4828} 4829 4830void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4831 if (!D) 4832 return; 4833 4834 TemplateParameterList *Params = 0; 4835 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4836 Params = Template->getTemplateParameters(); 4837 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4838 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4839 Params = PartialSpec->getTemplateParameters(); 4840 else 4841 return; 4842 4843 for (TemplateParameterList::iterator Param = Params->begin(), 4844 ParamEnd = Params->end(); 4845 Param != ParamEnd; ++Param) { 4846 NamedDecl *Named = cast<NamedDecl>(*Param); 4847 if (Named->getDeclName()) { 4848 S->AddDecl(Named); 4849 IdResolver.AddDecl(Named); 4850 } 4851 } 4852} 4853 4854void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4855 if (!RecordD) return; 4856 AdjustDeclIfTemplate(RecordD); 4857 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4858 PushDeclContext(S, Record); 4859} 4860 4861void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4862 if (!RecordD) return; 4863 PopDeclContext(); 4864} 4865 4866/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4867/// parsing a top-level (non-nested) C++ class, and we are now 4868/// parsing those parts of the given Method declaration that could 4869/// not be parsed earlier (C++ [class.mem]p2), such as default 4870/// arguments. This action should enter the scope of the given 4871/// Method declaration as if we had just parsed the qualified method 4872/// name. However, it should not bring the parameters into scope; 4873/// that will be performed by ActOnDelayedCXXMethodParameter. 4874void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4875} 4876 4877/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4878/// C++ method declaration. We're (re-)introducing the given 4879/// function parameter into scope for use in parsing later parts of 4880/// the method declaration. For example, we could see an 4881/// ActOnParamDefaultArgument event for this parameter. 4882void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4883 if (!ParamD) 4884 return; 4885 4886 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4887 4888 // If this parameter has an unparsed default argument, clear it out 4889 // to make way for the parsed default argument. 4890 if (Param->hasUnparsedDefaultArg()) 4891 Param->setDefaultArg(0); 4892 4893 S->AddDecl(Param); 4894 if (Param->getDeclName()) 4895 IdResolver.AddDecl(Param); 4896} 4897 4898/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4899/// processing the delayed method declaration for Method. The method 4900/// declaration is now considered finished. There may be a separate 4901/// ActOnStartOfFunctionDef action later (not necessarily 4902/// immediately!) for this method, if it was also defined inside the 4903/// class body. 4904void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4905 if (!MethodD) 4906 return; 4907 4908 AdjustDeclIfTemplate(MethodD); 4909 4910 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4911 4912 // Now that we have our default arguments, check the constructor 4913 // again. It could produce additional diagnostics or affect whether 4914 // the class has implicitly-declared destructors, among other 4915 // things. 4916 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4917 CheckConstructor(Constructor); 4918 4919 // Check the default arguments, which we may have added. 4920 if (!Method->isInvalidDecl()) 4921 CheckCXXDefaultArguments(Method); 4922} 4923 4924/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4925/// the well-formedness of the constructor declarator @p D with type @p 4926/// R. If there are any errors in the declarator, this routine will 4927/// emit diagnostics and set the invalid bit to true. In any case, the type 4928/// will be updated to reflect a well-formed type for the constructor and 4929/// returned. 4930QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4931 StorageClass &SC) { 4932 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4933 4934 // C++ [class.ctor]p3: 4935 // A constructor shall not be virtual (10.3) or static (9.4). A 4936 // constructor can be invoked for a const, volatile or const 4937 // volatile object. A constructor shall not be declared const, 4938 // volatile, or const volatile (9.3.2). 4939 if (isVirtual) { 4940 if (!D.isInvalidType()) 4941 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4942 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4943 << SourceRange(D.getIdentifierLoc()); 4944 D.setInvalidType(); 4945 } 4946 if (SC == SC_Static) { 4947 if (!D.isInvalidType()) 4948 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4949 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4950 << SourceRange(D.getIdentifierLoc()); 4951 D.setInvalidType(); 4952 SC = SC_None; 4953 } 4954 4955 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4956 if (FTI.TypeQuals != 0) { 4957 if (FTI.TypeQuals & Qualifiers::Const) 4958 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4959 << "const" << SourceRange(D.getIdentifierLoc()); 4960 if (FTI.TypeQuals & Qualifiers::Volatile) 4961 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4962 << "volatile" << SourceRange(D.getIdentifierLoc()); 4963 if (FTI.TypeQuals & Qualifiers::Restrict) 4964 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4965 << "restrict" << SourceRange(D.getIdentifierLoc()); 4966 D.setInvalidType(); 4967 } 4968 4969 // C++0x [class.ctor]p4: 4970 // A constructor shall not be declared with a ref-qualifier. 4971 if (FTI.hasRefQualifier()) { 4972 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 4973 << FTI.RefQualifierIsLValueRef 4974 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4975 D.setInvalidType(); 4976 } 4977 4978 // Rebuild the function type "R" without any type qualifiers (in 4979 // case any of the errors above fired) and with "void" as the 4980 // return type, since constructors don't have return types. 4981 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4982 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 4983 return R; 4984 4985 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4986 EPI.TypeQuals = 0; 4987 EPI.RefQualifier = RQ_None; 4988 4989 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 4990 Proto->getNumArgs(), EPI); 4991} 4992 4993/// CheckConstructor - Checks a fully-formed constructor for 4994/// well-formedness, issuing any diagnostics required. Returns true if 4995/// the constructor declarator is invalid. 4996void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 4997 CXXRecordDecl *ClassDecl 4998 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 4999 if (!ClassDecl) 5000 return Constructor->setInvalidDecl(); 5001 5002 // C++ [class.copy]p3: 5003 // A declaration of a constructor for a class X is ill-formed if 5004 // its first parameter is of type (optionally cv-qualified) X and 5005 // either there are no other parameters or else all other 5006 // parameters have default arguments. 5007 if (!Constructor->isInvalidDecl() && 5008 ((Constructor->getNumParams() == 1) || 5009 (Constructor->getNumParams() > 1 && 5010 Constructor->getParamDecl(1)->hasDefaultArg())) && 5011 Constructor->getTemplateSpecializationKind() 5012 != TSK_ImplicitInstantiation) { 5013 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5014 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5015 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5016 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5017 const char *ConstRef 5018 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5019 : " const &"; 5020 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5021 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5022 5023 // FIXME: Rather that making the constructor invalid, we should endeavor 5024 // to fix the type. 5025 Constructor->setInvalidDecl(); 5026 } 5027 } 5028} 5029 5030/// CheckDestructor - Checks a fully-formed destructor definition for 5031/// well-formedness, issuing any diagnostics required. Returns true 5032/// on error. 5033bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5034 CXXRecordDecl *RD = Destructor->getParent(); 5035 5036 if (Destructor->isVirtual()) { 5037 SourceLocation Loc; 5038 5039 if (!Destructor->isImplicit()) 5040 Loc = Destructor->getLocation(); 5041 else 5042 Loc = RD->getLocation(); 5043 5044 // If we have a virtual destructor, look up the deallocation function 5045 FunctionDecl *OperatorDelete = 0; 5046 DeclarationName Name = 5047 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5048 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5049 return true; 5050 5051 MarkFunctionReferenced(Loc, OperatorDelete); 5052 5053 Destructor->setOperatorDelete(OperatorDelete); 5054 } 5055 5056 return false; 5057} 5058 5059static inline bool 5060FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5061 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5062 FTI.ArgInfo[0].Param && 5063 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5064} 5065 5066/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5067/// the well-formednes of the destructor declarator @p D with type @p 5068/// R. If there are any errors in the declarator, this routine will 5069/// emit diagnostics and set the declarator to invalid. Even if this happens, 5070/// will be updated to reflect a well-formed type for the destructor and 5071/// returned. 5072QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5073 StorageClass& SC) { 5074 // C++ [class.dtor]p1: 5075 // [...] A typedef-name that names a class is a class-name 5076 // (7.1.3); however, a typedef-name that names a class shall not 5077 // be used as the identifier in the declarator for a destructor 5078 // declaration. 5079 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5080 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5081 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5082 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5083 else if (const TemplateSpecializationType *TST = 5084 DeclaratorType->getAs<TemplateSpecializationType>()) 5085 if (TST->isTypeAlias()) 5086 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5087 << DeclaratorType << 1; 5088 5089 // C++ [class.dtor]p2: 5090 // A destructor is used to destroy objects of its class type. A 5091 // destructor takes no parameters, and no return type can be 5092 // specified for it (not even void). The address of a destructor 5093 // shall not be taken. A destructor shall not be static. A 5094 // destructor can be invoked for a const, volatile or const 5095 // volatile object. A destructor shall not be declared const, 5096 // volatile or const volatile (9.3.2). 5097 if (SC == SC_Static) { 5098 if (!D.isInvalidType()) 5099 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5100 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5101 << SourceRange(D.getIdentifierLoc()) 5102 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5103 5104 SC = SC_None; 5105 } 5106 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5107 // Destructors don't have return types, but the parser will 5108 // happily parse something like: 5109 // 5110 // class X { 5111 // float ~X(); 5112 // }; 5113 // 5114 // The return type will be eliminated later. 5115 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5116 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5117 << SourceRange(D.getIdentifierLoc()); 5118 } 5119 5120 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5121 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5122 if (FTI.TypeQuals & Qualifiers::Const) 5123 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5124 << "const" << SourceRange(D.getIdentifierLoc()); 5125 if (FTI.TypeQuals & Qualifiers::Volatile) 5126 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5127 << "volatile" << SourceRange(D.getIdentifierLoc()); 5128 if (FTI.TypeQuals & Qualifiers::Restrict) 5129 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5130 << "restrict" << SourceRange(D.getIdentifierLoc()); 5131 D.setInvalidType(); 5132 } 5133 5134 // C++0x [class.dtor]p2: 5135 // A destructor shall not be declared with a ref-qualifier. 5136 if (FTI.hasRefQualifier()) { 5137 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5138 << FTI.RefQualifierIsLValueRef 5139 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5140 D.setInvalidType(); 5141 } 5142 5143 // Make sure we don't have any parameters. 5144 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5145 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5146 5147 // Delete the parameters. 5148 FTI.freeArgs(); 5149 D.setInvalidType(); 5150 } 5151 5152 // Make sure the destructor isn't variadic. 5153 if (FTI.isVariadic) { 5154 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5155 D.setInvalidType(); 5156 } 5157 5158 // Rebuild the function type "R" without any type qualifiers or 5159 // parameters (in case any of the errors above fired) and with 5160 // "void" as the return type, since destructors don't have return 5161 // types. 5162 if (!D.isInvalidType()) 5163 return R; 5164 5165 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5166 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5167 EPI.Variadic = false; 5168 EPI.TypeQuals = 0; 5169 EPI.RefQualifier = RQ_None; 5170 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5171} 5172 5173/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5174/// well-formednes of the conversion function declarator @p D with 5175/// type @p R. If there are any errors in the declarator, this routine 5176/// will emit diagnostics and return true. Otherwise, it will return 5177/// false. Either way, the type @p R will be updated to reflect a 5178/// well-formed type for the conversion operator. 5179void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5180 StorageClass& SC) { 5181 // C++ [class.conv.fct]p1: 5182 // Neither parameter types nor return type can be specified. The 5183 // type of a conversion function (8.3.5) is "function taking no 5184 // parameter returning conversion-type-id." 5185 if (SC == SC_Static) { 5186 if (!D.isInvalidType()) 5187 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5188 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5189 << SourceRange(D.getIdentifierLoc()); 5190 D.setInvalidType(); 5191 SC = SC_None; 5192 } 5193 5194 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5195 5196 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5197 // Conversion functions don't have return types, but the parser will 5198 // happily parse something like: 5199 // 5200 // class X { 5201 // float operator bool(); 5202 // }; 5203 // 5204 // The return type will be changed later anyway. 5205 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5206 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5207 << SourceRange(D.getIdentifierLoc()); 5208 D.setInvalidType(); 5209 } 5210 5211 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5212 5213 // Make sure we don't have any parameters. 5214 if (Proto->getNumArgs() > 0) { 5215 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5216 5217 // Delete the parameters. 5218 D.getFunctionTypeInfo().freeArgs(); 5219 D.setInvalidType(); 5220 } else if (Proto->isVariadic()) { 5221 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5222 D.setInvalidType(); 5223 } 5224 5225 // Diagnose "&operator bool()" and other such nonsense. This 5226 // is actually a gcc extension which we don't support. 5227 if (Proto->getResultType() != ConvType) { 5228 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5229 << Proto->getResultType(); 5230 D.setInvalidType(); 5231 ConvType = Proto->getResultType(); 5232 } 5233 5234 // C++ [class.conv.fct]p4: 5235 // The conversion-type-id shall not represent a function type nor 5236 // an array type. 5237 if (ConvType->isArrayType()) { 5238 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5239 ConvType = Context.getPointerType(ConvType); 5240 D.setInvalidType(); 5241 } else if (ConvType->isFunctionType()) { 5242 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5243 ConvType = Context.getPointerType(ConvType); 5244 D.setInvalidType(); 5245 } 5246 5247 // Rebuild the function type "R" without any parameters (in case any 5248 // of the errors above fired) and with the conversion type as the 5249 // return type. 5250 if (D.isInvalidType()) 5251 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5252 5253 // C++0x explicit conversion operators. 5254 if (D.getDeclSpec().isExplicitSpecified()) 5255 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5256 getLangOpts().CPlusPlus0x ? 5257 diag::warn_cxx98_compat_explicit_conversion_functions : 5258 diag::ext_explicit_conversion_functions) 5259 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5260} 5261 5262/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5263/// the declaration of the given C++ conversion function. This routine 5264/// is responsible for recording the conversion function in the C++ 5265/// class, if possible. 5266Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5267 assert(Conversion && "Expected to receive a conversion function declaration"); 5268 5269 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5270 5271 // Make sure we aren't redeclaring the conversion function. 5272 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5273 5274 // C++ [class.conv.fct]p1: 5275 // [...] A conversion function is never used to convert a 5276 // (possibly cv-qualified) object to the (possibly cv-qualified) 5277 // same object type (or a reference to it), to a (possibly 5278 // cv-qualified) base class of that type (or a reference to it), 5279 // or to (possibly cv-qualified) void. 5280 // FIXME: Suppress this warning if the conversion function ends up being a 5281 // virtual function that overrides a virtual function in a base class. 5282 QualType ClassType 5283 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5284 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5285 ConvType = ConvTypeRef->getPointeeType(); 5286 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5287 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5288 /* Suppress diagnostics for instantiations. */; 5289 else if (ConvType->isRecordType()) { 5290 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5291 if (ConvType == ClassType) 5292 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5293 << ClassType; 5294 else if (IsDerivedFrom(ClassType, ConvType)) 5295 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5296 << ClassType << ConvType; 5297 } else if (ConvType->isVoidType()) { 5298 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5299 << ClassType << ConvType; 5300 } 5301 5302 if (FunctionTemplateDecl *ConversionTemplate 5303 = Conversion->getDescribedFunctionTemplate()) 5304 return ConversionTemplate; 5305 5306 return Conversion; 5307} 5308 5309//===----------------------------------------------------------------------===// 5310// Namespace Handling 5311//===----------------------------------------------------------------------===// 5312 5313 5314 5315/// ActOnStartNamespaceDef - This is called at the start of a namespace 5316/// definition. 5317Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5318 SourceLocation InlineLoc, 5319 SourceLocation NamespaceLoc, 5320 SourceLocation IdentLoc, 5321 IdentifierInfo *II, 5322 SourceLocation LBrace, 5323 AttributeList *AttrList) { 5324 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5325 // For anonymous namespace, take the location of the left brace. 5326 SourceLocation Loc = II ? IdentLoc : LBrace; 5327 bool IsInline = InlineLoc.isValid(); 5328 bool IsInvalid = false; 5329 bool IsStd = false; 5330 bool AddToKnown = false; 5331 Scope *DeclRegionScope = NamespcScope->getParent(); 5332 5333 NamespaceDecl *PrevNS = 0; 5334 if (II) { 5335 // C++ [namespace.def]p2: 5336 // The identifier in an original-namespace-definition shall not 5337 // have been previously defined in the declarative region in 5338 // which the original-namespace-definition appears. The 5339 // identifier in an original-namespace-definition is the name of 5340 // the namespace. Subsequently in that declarative region, it is 5341 // treated as an original-namespace-name. 5342 // 5343 // Since namespace names are unique in their scope, and we don't 5344 // look through using directives, just look for any ordinary names. 5345 5346 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5347 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5348 Decl::IDNS_Namespace; 5349 NamedDecl *PrevDecl = 0; 5350 for (DeclContext::lookup_result R 5351 = CurContext->getRedeclContext()->lookup(II); 5352 R.first != R.second; ++R.first) { 5353 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5354 PrevDecl = *R.first; 5355 break; 5356 } 5357 } 5358 5359 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5360 5361 if (PrevNS) { 5362 // This is an extended namespace definition. 5363 if (IsInline != PrevNS->isInline()) { 5364 // inline-ness must match 5365 if (PrevNS->isInline()) { 5366 // The user probably just forgot the 'inline', so suggest that it 5367 // be added back. 5368 Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5369 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5370 } else { 5371 Diag(Loc, diag::err_inline_namespace_mismatch) 5372 << IsInline; 5373 } 5374 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5375 5376 IsInline = PrevNS->isInline(); 5377 } 5378 } else if (PrevDecl) { 5379 // This is an invalid name redefinition. 5380 Diag(Loc, diag::err_redefinition_different_kind) 5381 << II; 5382 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5383 IsInvalid = true; 5384 // Continue on to push Namespc as current DeclContext and return it. 5385 } else if (II->isStr("std") && 5386 CurContext->getRedeclContext()->isTranslationUnit()) { 5387 // This is the first "real" definition of the namespace "std", so update 5388 // our cache of the "std" namespace to point at this definition. 5389 PrevNS = getStdNamespace(); 5390 IsStd = true; 5391 AddToKnown = !IsInline; 5392 } else { 5393 // We've seen this namespace for the first time. 5394 AddToKnown = !IsInline; 5395 } 5396 } else { 5397 // Anonymous namespaces. 5398 5399 // Determine whether the parent already has an anonymous namespace. 5400 DeclContext *Parent = CurContext->getRedeclContext(); 5401 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5402 PrevNS = TU->getAnonymousNamespace(); 5403 } else { 5404 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5405 PrevNS = ND->getAnonymousNamespace(); 5406 } 5407 5408 if (PrevNS && IsInline != PrevNS->isInline()) { 5409 // inline-ness must match 5410 Diag(Loc, diag::err_inline_namespace_mismatch) 5411 << IsInline; 5412 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5413 5414 // Recover by ignoring the new namespace's inline status. 5415 IsInline = PrevNS->isInline(); 5416 } 5417 } 5418 5419 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5420 StartLoc, Loc, II, PrevNS); 5421 if (IsInvalid) 5422 Namespc->setInvalidDecl(); 5423 5424 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5425 5426 // FIXME: Should we be merging attributes? 5427 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5428 PushNamespaceVisibilityAttr(Attr, Loc); 5429 5430 if (IsStd) 5431 StdNamespace = Namespc; 5432 if (AddToKnown) 5433 KnownNamespaces[Namespc] = false; 5434 5435 if (II) { 5436 PushOnScopeChains(Namespc, DeclRegionScope); 5437 } else { 5438 // Link the anonymous namespace into its parent. 5439 DeclContext *Parent = CurContext->getRedeclContext(); 5440 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5441 TU->setAnonymousNamespace(Namespc); 5442 } else { 5443 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5444 } 5445 5446 CurContext->addDecl(Namespc); 5447 5448 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5449 // behaves as if it were replaced by 5450 // namespace unique { /* empty body */ } 5451 // using namespace unique; 5452 // namespace unique { namespace-body } 5453 // where all occurrences of 'unique' in a translation unit are 5454 // replaced by the same identifier and this identifier differs 5455 // from all other identifiers in the entire program. 5456 5457 // We just create the namespace with an empty name and then add an 5458 // implicit using declaration, just like the standard suggests. 5459 // 5460 // CodeGen enforces the "universally unique" aspect by giving all 5461 // declarations semantically contained within an anonymous 5462 // namespace internal linkage. 5463 5464 if (!PrevNS) { 5465 UsingDirectiveDecl* UD 5466 = UsingDirectiveDecl::Create(Context, CurContext, 5467 /* 'using' */ LBrace, 5468 /* 'namespace' */ SourceLocation(), 5469 /* qualifier */ NestedNameSpecifierLoc(), 5470 /* identifier */ SourceLocation(), 5471 Namespc, 5472 /* Ancestor */ CurContext); 5473 UD->setImplicit(); 5474 CurContext->addDecl(UD); 5475 } 5476 } 5477 5478 ActOnDocumentableDecl(Namespc); 5479 5480 // Although we could have an invalid decl (i.e. the namespace name is a 5481 // redefinition), push it as current DeclContext and try to continue parsing. 5482 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5483 // for the namespace has the declarations that showed up in that particular 5484 // namespace definition. 5485 PushDeclContext(NamespcScope, Namespc); 5486 return Namespc; 5487} 5488 5489/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5490/// is a namespace alias, returns the namespace it points to. 5491static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5492 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5493 return AD->getNamespace(); 5494 return dyn_cast_or_null<NamespaceDecl>(D); 5495} 5496 5497/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5498/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5499void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5500 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5501 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5502 Namespc->setRBraceLoc(RBrace); 5503 PopDeclContext(); 5504 if (Namespc->hasAttr<VisibilityAttr>()) 5505 PopPragmaVisibility(true, RBrace); 5506} 5507 5508CXXRecordDecl *Sema::getStdBadAlloc() const { 5509 return cast_or_null<CXXRecordDecl>( 5510 StdBadAlloc.get(Context.getExternalSource())); 5511} 5512 5513NamespaceDecl *Sema::getStdNamespace() const { 5514 return cast_or_null<NamespaceDecl>( 5515 StdNamespace.get(Context.getExternalSource())); 5516} 5517 5518/// \brief Retrieve the special "std" namespace, which may require us to 5519/// implicitly define the namespace. 5520NamespaceDecl *Sema::getOrCreateStdNamespace() { 5521 if (!StdNamespace) { 5522 // The "std" namespace has not yet been defined, so build one implicitly. 5523 StdNamespace = NamespaceDecl::Create(Context, 5524 Context.getTranslationUnitDecl(), 5525 /*Inline=*/false, 5526 SourceLocation(), SourceLocation(), 5527 &PP.getIdentifierTable().get("std"), 5528 /*PrevDecl=*/0); 5529 getStdNamespace()->setImplicit(true); 5530 } 5531 5532 return getStdNamespace(); 5533} 5534 5535bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 5536 assert(getLangOpts().CPlusPlus && 5537 "Looking for std::initializer_list outside of C++."); 5538 5539 // We're looking for implicit instantiations of 5540 // template <typename E> class std::initializer_list. 5541 5542 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 5543 return false; 5544 5545 ClassTemplateDecl *Template = 0; 5546 const TemplateArgument *Arguments = 0; 5547 5548 if (const RecordType *RT = Ty->getAs<RecordType>()) { 5549 5550 ClassTemplateSpecializationDecl *Specialization = 5551 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 5552 if (!Specialization) 5553 return false; 5554 5555 Template = Specialization->getSpecializedTemplate(); 5556 Arguments = Specialization->getTemplateArgs().data(); 5557 } else if (const TemplateSpecializationType *TST = 5558 Ty->getAs<TemplateSpecializationType>()) { 5559 Template = dyn_cast_or_null<ClassTemplateDecl>( 5560 TST->getTemplateName().getAsTemplateDecl()); 5561 Arguments = TST->getArgs(); 5562 } 5563 if (!Template) 5564 return false; 5565 5566 if (!StdInitializerList) { 5567 // Haven't recognized std::initializer_list yet, maybe this is it. 5568 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 5569 if (TemplateClass->getIdentifier() != 5570 &PP.getIdentifierTable().get("initializer_list") || 5571 !getStdNamespace()->InEnclosingNamespaceSetOf( 5572 TemplateClass->getDeclContext())) 5573 return false; 5574 // This is a template called std::initializer_list, but is it the right 5575 // template? 5576 TemplateParameterList *Params = Template->getTemplateParameters(); 5577 if (Params->getMinRequiredArguments() != 1) 5578 return false; 5579 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 5580 return false; 5581 5582 // It's the right template. 5583 StdInitializerList = Template; 5584 } 5585 5586 if (Template != StdInitializerList) 5587 return false; 5588 5589 // This is an instance of std::initializer_list. Find the argument type. 5590 if (Element) 5591 *Element = Arguments[0].getAsType(); 5592 return true; 5593} 5594 5595static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 5596 NamespaceDecl *Std = S.getStdNamespace(); 5597 if (!Std) { 5598 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5599 return 0; 5600 } 5601 5602 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 5603 Loc, Sema::LookupOrdinaryName); 5604 if (!S.LookupQualifiedName(Result, Std)) { 5605 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5606 return 0; 5607 } 5608 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 5609 if (!Template) { 5610 Result.suppressDiagnostics(); 5611 // We found something weird. Complain about the first thing we found. 5612 NamedDecl *Found = *Result.begin(); 5613 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 5614 return 0; 5615 } 5616 5617 // We found some template called std::initializer_list. Now verify that it's 5618 // correct. 5619 TemplateParameterList *Params = Template->getTemplateParameters(); 5620 if (Params->getMinRequiredArguments() != 1 || 5621 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 5622 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 5623 return 0; 5624 } 5625 5626 return Template; 5627} 5628 5629QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 5630 if (!StdInitializerList) { 5631 StdInitializerList = LookupStdInitializerList(*this, Loc); 5632 if (!StdInitializerList) 5633 return QualType(); 5634 } 5635 5636 TemplateArgumentListInfo Args(Loc, Loc); 5637 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 5638 Context.getTrivialTypeSourceInfo(Element, 5639 Loc))); 5640 return Context.getCanonicalType( 5641 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 5642} 5643 5644bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 5645 // C++ [dcl.init.list]p2: 5646 // A constructor is an initializer-list constructor if its first parameter 5647 // is of type std::initializer_list<E> or reference to possibly cv-qualified 5648 // std::initializer_list<E> for some type E, and either there are no other 5649 // parameters or else all other parameters have default arguments. 5650 if (Ctor->getNumParams() < 1 || 5651 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 5652 return false; 5653 5654 QualType ArgType = Ctor->getParamDecl(0)->getType(); 5655 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 5656 ArgType = RT->getPointeeType().getUnqualifiedType(); 5657 5658 return isStdInitializerList(ArgType, 0); 5659} 5660 5661/// \brief Determine whether a using statement is in a context where it will be 5662/// apply in all contexts. 5663static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5664 switch (CurContext->getDeclKind()) { 5665 case Decl::TranslationUnit: 5666 return true; 5667 case Decl::LinkageSpec: 5668 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5669 default: 5670 return false; 5671 } 5672} 5673 5674namespace { 5675 5676// Callback to only accept typo corrections that are namespaces. 5677class NamespaceValidatorCCC : public CorrectionCandidateCallback { 5678 public: 5679 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5680 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 5681 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 5682 } 5683 return false; 5684 } 5685}; 5686 5687} 5688 5689static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5690 CXXScopeSpec &SS, 5691 SourceLocation IdentLoc, 5692 IdentifierInfo *Ident) { 5693 NamespaceValidatorCCC Validator; 5694 R.clear(); 5695 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5696 R.getLookupKind(), Sc, &SS, 5697 Validator)) { 5698 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 5699 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOpts())); 5700 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5701 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5702 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5703 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5704 else 5705 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5706 << Ident << CorrectedQuotedStr 5707 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5708 5709 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5710 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5711 5712 R.addDecl(Corrected.getCorrectionDecl()); 5713 return true; 5714 } 5715 return false; 5716} 5717 5718Decl *Sema::ActOnUsingDirective(Scope *S, 5719 SourceLocation UsingLoc, 5720 SourceLocation NamespcLoc, 5721 CXXScopeSpec &SS, 5722 SourceLocation IdentLoc, 5723 IdentifierInfo *NamespcName, 5724 AttributeList *AttrList) { 5725 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5726 assert(NamespcName && "Invalid NamespcName."); 5727 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5728 5729 // This can only happen along a recovery path. 5730 while (S->getFlags() & Scope::TemplateParamScope) 5731 S = S->getParent(); 5732 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5733 5734 UsingDirectiveDecl *UDir = 0; 5735 NestedNameSpecifier *Qualifier = 0; 5736 if (SS.isSet()) 5737 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5738 5739 // Lookup namespace name. 5740 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5741 LookupParsedName(R, S, &SS); 5742 if (R.isAmbiguous()) 5743 return 0; 5744 5745 if (R.empty()) { 5746 R.clear(); 5747 // Allow "using namespace std;" or "using namespace ::std;" even if 5748 // "std" hasn't been defined yet, for GCC compatibility. 5749 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5750 NamespcName->isStr("std")) { 5751 Diag(IdentLoc, diag::ext_using_undefined_std); 5752 R.addDecl(getOrCreateStdNamespace()); 5753 R.resolveKind(); 5754 } 5755 // Otherwise, attempt typo correction. 5756 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5757 } 5758 5759 if (!R.empty()) { 5760 NamedDecl *Named = R.getFoundDecl(); 5761 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5762 && "expected namespace decl"); 5763 // C++ [namespace.udir]p1: 5764 // A using-directive specifies that the names in the nominated 5765 // namespace can be used in the scope in which the 5766 // using-directive appears after the using-directive. During 5767 // unqualified name lookup (3.4.1), the names appear as if they 5768 // were declared in the nearest enclosing namespace which 5769 // contains both the using-directive and the nominated 5770 // namespace. [Note: in this context, "contains" means "contains 5771 // directly or indirectly". ] 5772 5773 // Find enclosing context containing both using-directive and 5774 // nominated namespace. 5775 NamespaceDecl *NS = getNamespaceDecl(Named); 5776 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5777 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5778 CommonAncestor = CommonAncestor->getParent(); 5779 5780 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5781 SS.getWithLocInContext(Context), 5782 IdentLoc, Named, CommonAncestor); 5783 5784 if (IsUsingDirectiveInToplevelContext(CurContext) && 5785 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5786 Diag(IdentLoc, diag::warn_using_directive_in_header); 5787 } 5788 5789 PushUsingDirective(S, UDir); 5790 } else { 5791 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5792 } 5793 5794 // FIXME: We ignore attributes for now. 5795 return UDir; 5796} 5797 5798void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5799 // If the scope has an associated entity and the using directive is at 5800 // namespace or translation unit scope, add the UsingDirectiveDecl into 5801 // its lookup structure so qualified name lookup can find it. 5802 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()); 5803 if (Ctx && !Ctx->isFunctionOrMethod()) 5804 Ctx->addDecl(UDir); 5805 else 5806 // Otherwise, it is at block sope. The using-directives will affect lookup 5807 // only to the end of the scope. 5808 S->PushUsingDirective(UDir); 5809} 5810 5811 5812Decl *Sema::ActOnUsingDeclaration(Scope *S, 5813 AccessSpecifier AS, 5814 bool HasUsingKeyword, 5815 SourceLocation UsingLoc, 5816 CXXScopeSpec &SS, 5817 UnqualifiedId &Name, 5818 AttributeList *AttrList, 5819 bool IsTypeName, 5820 SourceLocation TypenameLoc) { 5821 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5822 5823 switch (Name.getKind()) { 5824 case UnqualifiedId::IK_ImplicitSelfParam: 5825 case UnqualifiedId::IK_Identifier: 5826 case UnqualifiedId::IK_OperatorFunctionId: 5827 case UnqualifiedId::IK_LiteralOperatorId: 5828 case UnqualifiedId::IK_ConversionFunctionId: 5829 break; 5830 5831 case UnqualifiedId::IK_ConstructorName: 5832 case UnqualifiedId::IK_ConstructorTemplateId: 5833 // C++11 inheriting constructors. 5834 Diag(Name.getLocStart(), 5835 getLangOpts().CPlusPlus0x ? 5836 // FIXME: Produce warn_cxx98_compat_using_decl_constructor 5837 // instead once inheriting constructors work. 5838 diag::err_using_decl_constructor_unsupported : 5839 diag::err_using_decl_constructor) 5840 << SS.getRange(); 5841 5842 if (getLangOpts().CPlusPlus0x) break; 5843 5844 return 0; 5845 5846 case UnqualifiedId::IK_DestructorName: 5847 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 5848 << SS.getRange(); 5849 return 0; 5850 5851 case UnqualifiedId::IK_TemplateId: 5852 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 5853 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5854 return 0; 5855 } 5856 5857 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5858 DeclarationName TargetName = TargetNameInfo.getName(); 5859 if (!TargetName) 5860 return 0; 5861 5862 // Warn about using declarations. 5863 // TODO: store that the declaration was written without 'using' and 5864 // talk about access decls instead of using decls in the 5865 // diagnostics. 5866 if (!HasUsingKeyword) { 5867 UsingLoc = Name.getLocStart(); 5868 5869 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5870 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5871 } 5872 5873 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5874 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5875 return 0; 5876 5877 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5878 TargetNameInfo, AttrList, 5879 /* IsInstantiation */ false, 5880 IsTypeName, TypenameLoc); 5881 if (UD) 5882 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5883 5884 return UD; 5885} 5886 5887/// \brief Determine whether a using declaration considers the given 5888/// declarations as "equivalent", e.g., if they are redeclarations of 5889/// the same entity or are both typedefs of the same type. 5890static bool 5891IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5892 bool &SuppressRedeclaration) { 5893 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5894 SuppressRedeclaration = false; 5895 return true; 5896 } 5897 5898 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5899 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5900 SuppressRedeclaration = true; 5901 return Context.hasSameType(TD1->getUnderlyingType(), 5902 TD2->getUnderlyingType()); 5903 } 5904 5905 return false; 5906} 5907 5908 5909/// Determines whether to create a using shadow decl for a particular 5910/// decl, given the set of decls existing prior to this using lookup. 5911bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5912 const LookupResult &Previous) { 5913 // Diagnose finding a decl which is not from a base class of the 5914 // current class. We do this now because there are cases where this 5915 // function will silently decide not to build a shadow decl, which 5916 // will pre-empt further diagnostics. 5917 // 5918 // We don't need to do this in C++0x because we do the check once on 5919 // the qualifier. 5920 // 5921 // FIXME: diagnose the following if we care enough: 5922 // struct A { int foo; }; 5923 // struct B : A { using A::foo; }; 5924 // template <class T> struct C : A {}; 5925 // template <class T> struct D : C<T> { using B::foo; } // <--- 5926 // This is invalid (during instantiation) in C++03 because B::foo 5927 // resolves to the using decl in B, which is not a base class of D<T>. 5928 // We can't diagnose it immediately because C<T> is an unknown 5929 // specialization. The UsingShadowDecl in D<T> then points directly 5930 // to A::foo, which will look well-formed when we instantiate. 5931 // The right solution is to not collapse the shadow-decl chain. 5932 if (!getLangOpts().CPlusPlus0x && CurContext->isRecord()) { 5933 DeclContext *OrigDC = Orig->getDeclContext(); 5934 5935 // Handle enums and anonymous structs. 5936 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5937 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5938 while (OrigRec->isAnonymousStructOrUnion()) 5939 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5940 5941 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5942 if (OrigDC == CurContext) { 5943 Diag(Using->getLocation(), 5944 diag::err_using_decl_nested_name_specifier_is_current_class) 5945 << Using->getQualifierLoc().getSourceRange(); 5946 Diag(Orig->getLocation(), diag::note_using_decl_target); 5947 return true; 5948 } 5949 5950 Diag(Using->getQualifierLoc().getBeginLoc(), 5951 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5952 << Using->getQualifier() 5953 << cast<CXXRecordDecl>(CurContext) 5954 << Using->getQualifierLoc().getSourceRange(); 5955 Diag(Orig->getLocation(), diag::note_using_decl_target); 5956 return true; 5957 } 5958 } 5959 5960 if (Previous.empty()) return false; 5961 5962 NamedDecl *Target = Orig; 5963 if (isa<UsingShadowDecl>(Target)) 5964 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5965 5966 // If the target happens to be one of the previous declarations, we 5967 // don't have a conflict. 5968 // 5969 // FIXME: but we might be increasing its access, in which case we 5970 // should redeclare it. 5971 NamedDecl *NonTag = 0, *Tag = 0; 5972 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5973 I != E; ++I) { 5974 NamedDecl *D = (*I)->getUnderlyingDecl(); 5975 bool Result; 5976 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5977 return Result; 5978 5979 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5980 } 5981 5982 if (Target->isFunctionOrFunctionTemplate()) { 5983 FunctionDecl *FD; 5984 if (isa<FunctionTemplateDecl>(Target)) 5985 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5986 else 5987 FD = cast<FunctionDecl>(Target); 5988 5989 NamedDecl *OldDecl = 0; 5990 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 5991 case Ovl_Overload: 5992 return false; 5993 5994 case Ovl_NonFunction: 5995 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5996 break; 5997 5998 // We found a decl with the exact signature. 5999 case Ovl_Match: 6000 // If we're in a record, we want to hide the target, so we 6001 // return true (without a diagnostic) to tell the caller not to 6002 // build a shadow decl. 6003 if (CurContext->isRecord()) 6004 return true; 6005 6006 // If we're not in a record, this is an error. 6007 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6008 break; 6009 } 6010 6011 Diag(Target->getLocation(), diag::note_using_decl_target); 6012 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6013 return true; 6014 } 6015 6016 // Target is not a function. 6017 6018 if (isa<TagDecl>(Target)) { 6019 // No conflict between a tag and a non-tag. 6020 if (!Tag) return false; 6021 6022 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6023 Diag(Target->getLocation(), diag::note_using_decl_target); 6024 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6025 return true; 6026 } 6027 6028 // No conflict between a tag and a non-tag. 6029 if (!NonTag) return false; 6030 6031 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6032 Diag(Target->getLocation(), diag::note_using_decl_target); 6033 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6034 return true; 6035} 6036 6037/// Builds a shadow declaration corresponding to a 'using' declaration. 6038UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6039 UsingDecl *UD, 6040 NamedDecl *Orig) { 6041 6042 // If we resolved to another shadow declaration, just coalesce them. 6043 NamedDecl *Target = Orig; 6044 if (isa<UsingShadowDecl>(Target)) { 6045 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6046 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6047 } 6048 6049 UsingShadowDecl *Shadow 6050 = UsingShadowDecl::Create(Context, CurContext, 6051 UD->getLocation(), UD, Target); 6052 UD->addShadowDecl(Shadow); 6053 6054 Shadow->setAccess(UD->getAccess()); 6055 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6056 Shadow->setInvalidDecl(); 6057 6058 if (S) 6059 PushOnScopeChains(Shadow, S); 6060 else 6061 CurContext->addDecl(Shadow); 6062 6063 6064 return Shadow; 6065} 6066 6067/// Hides a using shadow declaration. This is required by the current 6068/// using-decl implementation when a resolvable using declaration in a 6069/// class is followed by a declaration which would hide or override 6070/// one or more of the using decl's targets; for example: 6071/// 6072/// struct Base { void foo(int); }; 6073/// struct Derived : Base { 6074/// using Base::foo; 6075/// void foo(int); 6076/// }; 6077/// 6078/// The governing language is C++03 [namespace.udecl]p12: 6079/// 6080/// When a using-declaration brings names from a base class into a 6081/// derived class scope, member functions in the derived class 6082/// override and/or hide member functions with the same name and 6083/// parameter types in a base class (rather than conflicting). 6084/// 6085/// There are two ways to implement this: 6086/// (1) optimistically create shadow decls when they're not hidden 6087/// by existing declarations, or 6088/// (2) don't create any shadow decls (or at least don't make them 6089/// visible) until we've fully parsed/instantiated the class. 6090/// The problem with (1) is that we might have to retroactively remove 6091/// a shadow decl, which requires several O(n) operations because the 6092/// decl structures are (very reasonably) not designed for removal. 6093/// (2) avoids this but is very fiddly and phase-dependent. 6094void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6095 if (Shadow->getDeclName().getNameKind() == 6096 DeclarationName::CXXConversionFunctionName) 6097 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6098 6099 // Remove it from the DeclContext... 6100 Shadow->getDeclContext()->removeDecl(Shadow); 6101 6102 // ...and the scope, if applicable... 6103 if (S) { 6104 S->RemoveDecl(Shadow); 6105 IdResolver.RemoveDecl(Shadow); 6106 } 6107 6108 // ...and the using decl. 6109 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6110 6111 // TODO: complain somehow if Shadow was used. It shouldn't 6112 // be possible for this to happen, because...? 6113} 6114 6115/// Builds a using declaration. 6116/// 6117/// \param IsInstantiation - Whether this call arises from an 6118/// instantiation of an unresolved using declaration. We treat 6119/// the lookup differently for these declarations. 6120NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6121 SourceLocation UsingLoc, 6122 CXXScopeSpec &SS, 6123 const DeclarationNameInfo &NameInfo, 6124 AttributeList *AttrList, 6125 bool IsInstantiation, 6126 bool IsTypeName, 6127 SourceLocation TypenameLoc) { 6128 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6129 SourceLocation IdentLoc = NameInfo.getLoc(); 6130 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6131 6132 // FIXME: We ignore attributes for now. 6133 6134 if (SS.isEmpty()) { 6135 Diag(IdentLoc, diag::err_using_requires_qualname); 6136 return 0; 6137 } 6138 6139 // Do the redeclaration lookup in the current scope. 6140 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6141 ForRedeclaration); 6142 Previous.setHideTags(false); 6143 if (S) { 6144 LookupName(Previous, S); 6145 6146 // It is really dumb that we have to do this. 6147 LookupResult::Filter F = Previous.makeFilter(); 6148 while (F.hasNext()) { 6149 NamedDecl *D = F.next(); 6150 if (!isDeclInScope(D, CurContext, S)) 6151 F.erase(); 6152 } 6153 F.done(); 6154 } else { 6155 assert(IsInstantiation && "no scope in non-instantiation"); 6156 assert(CurContext->isRecord() && "scope not record in instantiation"); 6157 LookupQualifiedName(Previous, CurContext); 6158 } 6159 6160 // Check for invalid redeclarations. 6161 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6162 return 0; 6163 6164 // Check for bad qualifiers. 6165 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6166 return 0; 6167 6168 DeclContext *LookupContext = computeDeclContext(SS); 6169 NamedDecl *D; 6170 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6171 if (!LookupContext) { 6172 if (IsTypeName) { 6173 // FIXME: not all declaration name kinds are legal here 6174 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6175 UsingLoc, TypenameLoc, 6176 QualifierLoc, 6177 IdentLoc, NameInfo.getName()); 6178 } else { 6179 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6180 QualifierLoc, NameInfo); 6181 } 6182 } else { 6183 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6184 NameInfo, IsTypeName); 6185 } 6186 D->setAccess(AS); 6187 CurContext->addDecl(D); 6188 6189 if (!LookupContext) return D; 6190 UsingDecl *UD = cast<UsingDecl>(D); 6191 6192 if (RequireCompleteDeclContext(SS, LookupContext)) { 6193 UD->setInvalidDecl(); 6194 return UD; 6195 } 6196 6197 // The normal rules do not apply to inheriting constructor declarations. 6198 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6199 if (CheckInheritingConstructorUsingDecl(UD)) 6200 UD->setInvalidDecl(); 6201 return UD; 6202 } 6203 6204 // Otherwise, look up the target name. 6205 6206 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6207 6208 // Unlike most lookups, we don't always want to hide tag 6209 // declarations: tag names are visible through the using declaration 6210 // even if hidden by ordinary names, *except* in a dependent context 6211 // where it's important for the sanity of two-phase lookup. 6212 if (!IsInstantiation) 6213 R.setHideTags(false); 6214 6215 // For the purposes of this lookup, we have a base object type 6216 // equal to that of the current context. 6217 if (CurContext->isRecord()) { 6218 R.setBaseObjectType( 6219 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); 6220 } 6221 6222 LookupQualifiedName(R, LookupContext); 6223 6224 if (R.empty()) { 6225 Diag(IdentLoc, diag::err_no_member) 6226 << NameInfo.getName() << LookupContext << SS.getRange(); 6227 UD->setInvalidDecl(); 6228 return UD; 6229 } 6230 6231 if (R.isAmbiguous()) { 6232 UD->setInvalidDecl(); 6233 return UD; 6234 } 6235 6236 if (IsTypeName) { 6237 // If we asked for a typename and got a non-type decl, error out. 6238 if (!R.getAsSingle<TypeDecl>()) { 6239 Diag(IdentLoc, diag::err_using_typename_non_type); 6240 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6241 Diag((*I)->getUnderlyingDecl()->getLocation(), 6242 diag::note_using_decl_target); 6243 UD->setInvalidDecl(); 6244 return UD; 6245 } 6246 } else { 6247 // If we asked for a non-typename and we got a type, error out, 6248 // but only if this is an instantiation of an unresolved using 6249 // decl. Otherwise just silently find the type name. 6250 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6251 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6252 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6253 UD->setInvalidDecl(); 6254 return UD; 6255 } 6256 } 6257 6258 // C++0x N2914 [namespace.udecl]p6: 6259 // A using-declaration shall not name a namespace. 6260 if (R.getAsSingle<NamespaceDecl>()) { 6261 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6262 << SS.getRange(); 6263 UD->setInvalidDecl(); 6264 return UD; 6265 } 6266 6267 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6268 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6269 BuildUsingShadowDecl(S, UD, *I); 6270 } 6271 6272 return UD; 6273} 6274 6275/// Additional checks for a using declaration referring to a constructor name. 6276bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { 6277 assert(!UD->isTypeName() && "expecting a constructor name"); 6278 6279 const Type *SourceType = UD->getQualifier()->getAsType(); 6280 assert(SourceType && 6281 "Using decl naming constructor doesn't have type in scope spec."); 6282 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6283 6284 // Check whether the named type is a direct base class. 6285 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6286 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6287 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6288 BaseIt != BaseE; ++BaseIt) { 6289 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6290 if (CanonicalSourceType == BaseType) 6291 break; 6292 if (BaseIt->getType()->isDependentType()) 6293 break; 6294 } 6295 6296 if (BaseIt == BaseE) { 6297 // Did not find SourceType in the bases. 6298 Diag(UD->getUsingLocation(), 6299 diag::err_using_decl_constructor_not_in_direct_base) 6300 << UD->getNameInfo().getSourceRange() 6301 << QualType(SourceType, 0) << TargetClass; 6302 return true; 6303 } 6304 6305 if (!CurContext->isDependentContext()) 6306 BaseIt->setInheritConstructors(); 6307 6308 return false; 6309} 6310 6311/// Checks that the given using declaration is not an invalid 6312/// redeclaration. Note that this is checking only for the using decl 6313/// itself, not for any ill-formedness among the UsingShadowDecls. 6314bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6315 bool isTypeName, 6316 const CXXScopeSpec &SS, 6317 SourceLocation NameLoc, 6318 const LookupResult &Prev) { 6319 // C++03 [namespace.udecl]p8: 6320 // C++0x [namespace.udecl]p10: 6321 // A using-declaration is a declaration and can therefore be used 6322 // repeatedly where (and only where) multiple declarations are 6323 // allowed. 6324 // 6325 // That's in non-member contexts. 6326 if (!CurContext->getRedeclContext()->isRecord()) 6327 return false; 6328 6329 NestedNameSpecifier *Qual 6330 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6331 6332 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6333 NamedDecl *D = *I; 6334 6335 bool DTypename; 6336 NestedNameSpecifier *DQual; 6337 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6338 DTypename = UD->isTypeName(); 6339 DQual = UD->getQualifier(); 6340 } else if (UnresolvedUsingValueDecl *UD 6341 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6342 DTypename = false; 6343 DQual = UD->getQualifier(); 6344 } else if (UnresolvedUsingTypenameDecl *UD 6345 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6346 DTypename = true; 6347 DQual = UD->getQualifier(); 6348 } else continue; 6349 6350 // using decls differ if one says 'typename' and the other doesn't. 6351 // FIXME: non-dependent using decls? 6352 if (isTypeName != DTypename) continue; 6353 6354 // using decls differ if they name different scopes (but note that 6355 // template instantiation can cause this check to trigger when it 6356 // didn't before instantiation). 6357 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6358 Context.getCanonicalNestedNameSpecifier(DQual)) 6359 continue; 6360 6361 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6362 Diag(D->getLocation(), diag::note_using_decl) << 1; 6363 return true; 6364 } 6365 6366 return false; 6367} 6368 6369 6370/// Checks that the given nested-name qualifier used in a using decl 6371/// in the current context is appropriately related to the current 6372/// scope. If an error is found, diagnoses it and returns true. 6373bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6374 const CXXScopeSpec &SS, 6375 SourceLocation NameLoc) { 6376 DeclContext *NamedContext = computeDeclContext(SS); 6377 6378 if (!CurContext->isRecord()) { 6379 // C++03 [namespace.udecl]p3: 6380 // C++0x [namespace.udecl]p8: 6381 // A using-declaration for a class member shall be a member-declaration. 6382 6383 // If we weren't able to compute a valid scope, it must be a 6384 // dependent class scope. 6385 if (!NamedContext || NamedContext->isRecord()) { 6386 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6387 << SS.getRange(); 6388 return true; 6389 } 6390 6391 // Otherwise, everything is known to be fine. 6392 return false; 6393 } 6394 6395 // The current scope is a record. 6396 6397 // If the named context is dependent, we can't decide much. 6398 if (!NamedContext) { 6399 // FIXME: in C++0x, we can diagnose if we can prove that the 6400 // nested-name-specifier does not refer to a base class, which is 6401 // still possible in some cases. 6402 6403 // Otherwise we have to conservatively report that things might be 6404 // okay. 6405 return false; 6406 } 6407 6408 if (!NamedContext->isRecord()) { 6409 // Ideally this would point at the last name in the specifier, 6410 // but we don't have that level of source info. 6411 Diag(SS.getRange().getBegin(), 6412 diag::err_using_decl_nested_name_specifier_is_not_class) 6413 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6414 return true; 6415 } 6416 6417 if (!NamedContext->isDependentContext() && 6418 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6419 return true; 6420 6421 if (getLangOpts().CPlusPlus0x) { 6422 // C++0x [namespace.udecl]p3: 6423 // In a using-declaration used as a member-declaration, the 6424 // nested-name-specifier shall name a base class of the class 6425 // being defined. 6426 6427 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6428 cast<CXXRecordDecl>(NamedContext))) { 6429 if (CurContext == NamedContext) { 6430 Diag(NameLoc, 6431 diag::err_using_decl_nested_name_specifier_is_current_class) 6432 << SS.getRange(); 6433 return true; 6434 } 6435 6436 Diag(SS.getRange().getBegin(), 6437 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6438 << (NestedNameSpecifier*) SS.getScopeRep() 6439 << cast<CXXRecordDecl>(CurContext) 6440 << SS.getRange(); 6441 return true; 6442 } 6443 6444 return false; 6445 } 6446 6447 // C++03 [namespace.udecl]p4: 6448 // A using-declaration used as a member-declaration shall refer 6449 // to a member of a base class of the class being defined [etc.]. 6450 6451 // Salient point: SS doesn't have to name a base class as long as 6452 // lookup only finds members from base classes. Therefore we can 6453 // diagnose here only if we can prove that that can't happen, 6454 // i.e. if the class hierarchies provably don't intersect. 6455 6456 // TODO: it would be nice if "definitely valid" results were cached 6457 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6458 // need to be repeated. 6459 6460 struct UserData { 6461 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 6462 6463 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6464 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6465 Data->Bases.insert(Base); 6466 return true; 6467 } 6468 6469 bool hasDependentBases(const CXXRecordDecl *Class) { 6470 return !Class->forallBases(collect, this); 6471 } 6472 6473 /// Returns true if the base is dependent or is one of the 6474 /// accumulated base classes. 6475 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6476 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6477 return !Data->Bases.count(Base); 6478 } 6479 6480 bool mightShareBases(const CXXRecordDecl *Class) { 6481 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6482 } 6483 }; 6484 6485 UserData Data; 6486 6487 // Returns false if we find a dependent base. 6488 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6489 return false; 6490 6491 // Returns false if the class has a dependent base or if it or one 6492 // of its bases is present in the base set of the current context. 6493 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6494 return false; 6495 6496 Diag(SS.getRange().getBegin(), 6497 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6498 << (NestedNameSpecifier*) SS.getScopeRep() 6499 << cast<CXXRecordDecl>(CurContext) 6500 << SS.getRange(); 6501 6502 return true; 6503} 6504 6505Decl *Sema::ActOnAliasDeclaration(Scope *S, 6506 AccessSpecifier AS, 6507 MultiTemplateParamsArg TemplateParamLists, 6508 SourceLocation UsingLoc, 6509 UnqualifiedId &Name, 6510 TypeResult Type) { 6511 // Skip up to the relevant declaration scope. 6512 while (S->getFlags() & Scope::TemplateParamScope) 6513 S = S->getParent(); 6514 assert((S->getFlags() & Scope::DeclScope) && 6515 "got alias-declaration outside of declaration scope"); 6516 6517 if (Type.isInvalid()) 6518 return 0; 6519 6520 bool Invalid = false; 6521 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6522 TypeSourceInfo *TInfo = 0; 6523 GetTypeFromParser(Type.get(), &TInfo); 6524 6525 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6526 return 0; 6527 6528 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6529 UPPC_DeclarationType)) { 6530 Invalid = true; 6531 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6532 TInfo->getTypeLoc().getBeginLoc()); 6533 } 6534 6535 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6536 LookupName(Previous, S); 6537 6538 // Warn about shadowing the name of a template parameter. 6539 if (Previous.isSingleResult() && 6540 Previous.getFoundDecl()->isTemplateParameter()) { 6541 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6542 Previous.clear(); 6543 } 6544 6545 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6546 "name in alias declaration must be an identifier"); 6547 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6548 Name.StartLocation, 6549 Name.Identifier, TInfo); 6550 6551 NewTD->setAccess(AS); 6552 6553 if (Invalid) 6554 NewTD->setInvalidDecl(); 6555 6556 CheckTypedefForVariablyModifiedType(S, NewTD); 6557 Invalid |= NewTD->isInvalidDecl(); 6558 6559 bool Redeclaration = false; 6560 6561 NamedDecl *NewND; 6562 if (TemplateParamLists.size()) { 6563 TypeAliasTemplateDecl *OldDecl = 0; 6564 TemplateParameterList *OldTemplateParams = 0; 6565 6566 if (TemplateParamLists.size() != 1) { 6567 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6568 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6569 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6570 } 6571 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6572 6573 // Only consider previous declarations in the same scope. 6574 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6575 /*ExplicitInstantiationOrSpecialization*/false); 6576 if (!Previous.empty()) { 6577 Redeclaration = true; 6578 6579 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6580 if (!OldDecl && !Invalid) { 6581 Diag(UsingLoc, diag::err_redefinition_different_kind) 6582 << Name.Identifier; 6583 6584 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6585 if (OldD->getLocation().isValid()) 6586 Diag(OldD->getLocation(), diag::note_previous_definition); 6587 6588 Invalid = true; 6589 } 6590 6591 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6592 if (TemplateParameterListsAreEqual(TemplateParams, 6593 OldDecl->getTemplateParameters(), 6594 /*Complain=*/true, 6595 TPL_TemplateMatch)) 6596 OldTemplateParams = OldDecl->getTemplateParameters(); 6597 else 6598 Invalid = true; 6599 6600 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6601 if (!Invalid && 6602 !Context.hasSameType(OldTD->getUnderlyingType(), 6603 NewTD->getUnderlyingType())) { 6604 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6605 // but we can't reasonably accept it. 6606 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6607 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6608 if (OldTD->getLocation().isValid()) 6609 Diag(OldTD->getLocation(), diag::note_previous_definition); 6610 Invalid = true; 6611 } 6612 } 6613 } 6614 6615 // Merge any previous default template arguments into our parameters, 6616 // and check the parameter list. 6617 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6618 TPC_TypeAliasTemplate)) 6619 return 0; 6620 6621 TypeAliasTemplateDecl *NewDecl = 6622 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6623 Name.Identifier, TemplateParams, 6624 NewTD); 6625 6626 NewDecl->setAccess(AS); 6627 6628 if (Invalid) 6629 NewDecl->setInvalidDecl(); 6630 else if (OldDecl) 6631 NewDecl->setPreviousDeclaration(OldDecl); 6632 6633 NewND = NewDecl; 6634 } else { 6635 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6636 NewND = NewTD; 6637 } 6638 6639 if (!Redeclaration) 6640 PushOnScopeChains(NewND, S); 6641 6642 ActOnDocumentableDecl(NewND); 6643 return NewND; 6644} 6645 6646Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6647 SourceLocation NamespaceLoc, 6648 SourceLocation AliasLoc, 6649 IdentifierInfo *Alias, 6650 CXXScopeSpec &SS, 6651 SourceLocation IdentLoc, 6652 IdentifierInfo *Ident) { 6653 6654 // Lookup the namespace name. 6655 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6656 LookupParsedName(R, S, &SS); 6657 6658 // Check if we have a previous declaration with the same name. 6659 NamedDecl *PrevDecl 6660 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6661 ForRedeclaration); 6662 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6663 PrevDecl = 0; 6664 6665 if (PrevDecl) { 6666 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6667 // We already have an alias with the same name that points to the same 6668 // namespace, so don't create a new one. 6669 // FIXME: At some point, we'll want to create the (redundant) 6670 // declaration to maintain better source information. 6671 if (!R.isAmbiguous() && !R.empty() && 6672 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6673 return 0; 6674 } 6675 6676 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6677 diag::err_redefinition_different_kind; 6678 Diag(AliasLoc, DiagID) << Alias; 6679 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6680 return 0; 6681 } 6682 6683 if (R.isAmbiguous()) 6684 return 0; 6685 6686 if (R.empty()) { 6687 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6688 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6689 return 0; 6690 } 6691 } 6692 6693 NamespaceAliasDecl *AliasDecl = 6694 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6695 Alias, SS.getWithLocInContext(Context), 6696 IdentLoc, R.getFoundDecl()); 6697 6698 PushOnScopeChains(AliasDecl, S); 6699 return AliasDecl; 6700} 6701 6702namespace { 6703 /// \brief Scoped object used to handle the state changes required in Sema 6704 /// to implicitly define the body of a C++ member function; 6705 class ImplicitlyDefinedFunctionScope { 6706 Sema &S; 6707 Sema::ContextRAII SavedContext; 6708 6709 public: 6710 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6711 : S(S), SavedContext(S, Method) 6712 { 6713 S.PushFunctionScope(); 6714 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6715 } 6716 6717 ~ImplicitlyDefinedFunctionScope() { 6718 S.PopExpressionEvaluationContext(); 6719 S.PopFunctionScopeInfo(); 6720 } 6721 }; 6722} 6723 6724Sema::ImplicitExceptionSpecification 6725Sema::ComputeDefaultedDefaultCtorExceptionSpec(SourceLocation Loc, 6726 CXXMethodDecl *MD) { 6727 CXXRecordDecl *ClassDecl = MD->getParent(); 6728 6729 // C++ [except.spec]p14: 6730 // An implicitly declared special member function (Clause 12) shall have an 6731 // exception-specification. [...] 6732 ImplicitExceptionSpecification ExceptSpec(*this); 6733 if (ClassDecl->isInvalidDecl()) 6734 return ExceptSpec; 6735 6736 // Direct base-class constructors. 6737 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6738 BEnd = ClassDecl->bases_end(); 6739 B != BEnd; ++B) { 6740 if (B->isVirtual()) // Handled below. 6741 continue; 6742 6743 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6744 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6745 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6746 // If this is a deleted function, add it anyway. This might be conformant 6747 // with the standard. This might not. I'm not sure. It might not matter. 6748 if (Constructor) 6749 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6750 } 6751 } 6752 6753 // Virtual base-class constructors. 6754 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6755 BEnd = ClassDecl->vbases_end(); 6756 B != BEnd; ++B) { 6757 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6758 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6759 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6760 // If this is a deleted function, add it anyway. This might be conformant 6761 // with the standard. This might not. I'm not sure. It might not matter. 6762 if (Constructor) 6763 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6764 } 6765 } 6766 6767 // Field constructors. 6768 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6769 FEnd = ClassDecl->field_end(); 6770 F != FEnd; ++F) { 6771 if (F->hasInClassInitializer()) { 6772 if (Expr *E = F->getInClassInitializer()) 6773 ExceptSpec.CalledExpr(E); 6774 else if (!F->isInvalidDecl()) 6775 // DR1351: 6776 // If the brace-or-equal-initializer of a non-static data member 6777 // invokes a defaulted default constructor of its class or of an 6778 // enclosing class in a potentially evaluated subexpression, the 6779 // program is ill-formed. 6780 // 6781 // This resolution is unworkable: the exception specification of the 6782 // default constructor can be needed in an unevaluated context, in 6783 // particular, in the operand of a noexcept-expression, and we can be 6784 // unable to compute an exception specification for an enclosed class. 6785 // 6786 // We do not allow an in-class initializer to require the evaluation 6787 // of the exception specification for any in-class initializer whose 6788 // definition is not lexically complete. 6789 Diag(Loc, diag::err_in_class_initializer_references_def_ctor) << MD; 6790 } else if (const RecordType *RecordTy 6791 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6792 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6793 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6794 // If this is a deleted function, add it anyway. This might be conformant 6795 // with the standard. This might not. I'm not sure. It might not matter. 6796 // In particular, the problem is that this function never gets called. It 6797 // might just be ill-formed because this function attempts to refer to 6798 // a deleted function here. 6799 if (Constructor) 6800 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 6801 } 6802 } 6803 6804 return ExceptSpec; 6805} 6806 6807CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6808 CXXRecordDecl *ClassDecl) { 6809 // C++ [class.ctor]p5: 6810 // A default constructor for a class X is a constructor of class X 6811 // that can be called without an argument. If there is no 6812 // user-declared constructor for class X, a default constructor is 6813 // implicitly declared. An implicitly-declared default constructor 6814 // is an inline public member of its class. 6815 assert(!ClassDecl->hasUserDeclaredConstructor() && 6816 "Should not build implicit default constructor!"); 6817 6818 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 6819 CXXDefaultConstructor, 6820 false); 6821 6822 // Create the actual constructor declaration. 6823 CanQualType ClassType 6824 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6825 SourceLocation ClassLoc = ClassDecl->getLocation(); 6826 DeclarationName Name 6827 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6828 DeclarationNameInfo NameInfo(Name, ClassLoc); 6829 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 6830 Context, ClassDecl, ClassLoc, NameInfo, /*Type*/QualType(), /*TInfo=*/0, 6831 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 6832 Constexpr); 6833 DefaultCon->setAccess(AS_public); 6834 DefaultCon->setDefaulted(); 6835 DefaultCon->setImplicit(); 6836 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6837 6838 // Build an exception specification pointing back at this constructor. 6839 FunctionProtoType::ExtProtoInfo EPI; 6840 EPI.ExceptionSpecType = EST_Unevaluated; 6841 EPI.ExceptionSpecDecl = DefaultCon; 6842 DefaultCon->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6843 6844 // Note that we have declared this constructor. 6845 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6846 6847 if (Scope *S = getScopeForContext(ClassDecl)) 6848 PushOnScopeChains(DefaultCon, S, false); 6849 ClassDecl->addDecl(DefaultCon); 6850 6851 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6852 DefaultCon->setDeletedAsWritten(); 6853 6854 return DefaultCon; 6855} 6856 6857void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6858 CXXConstructorDecl *Constructor) { 6859 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6860 !Constructor->doesThisDeclarationHaveABody() && 6861 !Constructor->isDeleted()) && 6862 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6863 6864 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6865 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6866 6867 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6868 DiagnosticErrorTrap Trap(Diags); 6869 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6870 Trap.hasErrorOccurred()) { 6871 Diag(CurrentLocation, diag::note_member_synthesized_at) 6872 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6873 Constructor->setInvalidDecl(); 6874 return; 6875 } 6876 6877 SourceLocation Loc = Constructor->getLocation(); 6878 Constructor->setBody(new (Context) CompoundStmt(Loc)); 6879 6880 Constructor->setUsed(); 6881 MarkVTableUsed(CurrentLocation, ClassDecl); 6882 6883 if (ASTMutationListener *L = getASTMutationListener()) { 6884 L->CompletedImplicitDefinition(Constructor); 6885 } 6886} 6887 6888void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6889 if (!D) return; 6890 AdjustDeclIfTemplate(D); 6891 6892 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6893 6894 if (!ClassDecl->isDependentType()) 6895 CheckExplicitlyDefaultedMethods(ClassDecl); 6896} 6897 6898void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6899 // We start with an initial pass over the base classes to collect those that 6900 // inherit constructors from. If there are none, we can forgo all further 6901 // processing. 6902 typedef SmallVector<const RecordType *, 4> BasesVector; 6903 BasesVector BasesToInheritFrom; 6904 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6905 BaseE = ClassDecl->bases_end(); 6906 BaseIt != BaseE; ++BaseIt) { 6907 if (BaseIt->getInheritConstructors()) { 6908 QualType Base = BaseIt->getType(); 6909 if (Base->isDependentType()) { 6910 // If we inherit constructors from anything that is dependent, just 6911 // abort processing altogether. We'll get another chance for the 6912 // instantiations. 6913 return; 6914 } 6915 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6916 } 6917 } 6918 if (BasesToInheritFrom.empty()) 6919 return; 6920 6921 // Now collect the constructors that we already have in the current class. 6922 // Those take precedence over inherited constructors. 6923 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6924 // unless there is a user-declared constructor with the same signature in 6925 // the class where the using-declaration appears. 6926 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6927 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6928 CtorE = ClassDecl->ctor_end(); 6929 CtorIt != CtorE; ++CtorIt) { 6930 ExistingConstructors.insert( 6931 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6932 } 6933 6934 DeclarationName CreatedCtorName = 6935 Context.DeclarationNames.getCXXConstructorName( 6936 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6937 6938 // Now comes the true work. 6939 // First, we keep a map from constructor types to the base that introduced 6940 // them. Needed for finding conflicting constructors. We also keep the 6941 // actually inserted declarations in there, for pretty diagnostics. 6942 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6943 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6944 ConstructorToSourceMap InheritedConstructors; 6945 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6946 BaseE = BasesToInheritFrom.end(); 6947 BaseIt != BaseE; ++BaseIt) { 6948 const RecordType *Base = *BaseIt; 6949 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6950 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6951 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6952 CtorE = BaseDecl->ctor_end(); 6953 CtorIt != CtorE; ++CtorIt) { 6954 // Find the using declaration for inheriting this base's constructors. 6955 // FIXME: Don't perform name lookup just to obtain a source location! 6956 DeclarationName Name = 6957 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6958 LookupResult Result(*this, Name, SourceLocation(), LookupUsingDeclName); 6959 LookupQualifiedName(Result, CurContext); 6960 UsingDecl *UD = Result.getAsSingle<UsingDecl>(); 6961 SourceLocation UsingLoc = UD ? UD->getLocation() : 6962 ClassDecl->getLocation(); 6963 6964 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6965 // from the class X named in the using-declaration consists of actual 6966 // constructors and notional constructors that result from the 6967 // transformation of defaulted parameters as follows: 6968 // - all non-template default constructors of X, and 6969 // - for each non-template constructor of X that has at least one 6970 // parameter with a default argument, the set of constructors that 6971 // results from omitting any ellipsis parameter specification and 6972 // successively omitting parameters with a default argument from the 6973 // end of the parameter-type-list. 6974 CXXConstructorDecl *BaseCtor = *CtorIt; 6975 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6976 const FunctionProtoType *BaseCtorType = 6977 BaseCtor->getType()->getAs<FunctionProtoType>(); 6978 6979 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6980 maxParams = BaseCtor->getNumParams(); 6981 params <= maxParams; ++params) { 6982 // Skip default constructors. They're never inherited. 6983 if (params == 0) 6984 continue; 6985 // Skip copy and move constructors for the same reason. 6986 if (CanBeCopyOrMove && params == 1) 6987 continue; 6988 6989 // Build up a function type for this particular constructor. 6990 // FIXME: The working paper does not consider that the exception spec 6991 // for the inheriting constructor might be larger than that of the 6992 // source. This code doesn't yet, either. When it does, this code will 6993 // need to be delayed until after exception specifications and in-class 6994 // member initializers are attached. 6995 const Type *NewCtorType; 6996 if (params == maxParams) 6997 NewCtorType = BaseCtorType; 6998 else { 6999 SmallVector<QualType, 16> Args; 7000 for (unsigned i = 0; i < params; ++i) { 7001 Args.push_back(BaseCtorType->getArgType(i)); 7002 } 7003 FunctionProtoType::ExtProtoInfo ExtInfo = 7004 BaseCtorType->getExtProtoInfo(); 7005 ExtInfo.Variadic = false; 7006 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7007 Args.data(), params, ExtInfo) 7008 .getTypePtr(); 7009 } 7010 const Type *CanonicalNewCtorType = 7011 Context.getCanonicalType(NewCtorType); 7012 7013 // Now that we have the type, first check if the class already has a 7014 // constructor with this signature. 7015 if (ExistingConstructors.count(CanonicalNewCtorType)) 7016 continue; 7017 7018 // Then we check if we have already declared an inherited constructor 7019 // with this signature. 7020 std::pair<ConstructorToSourceMap::iterator, bool> result = 7021 InheritedConstructors.insert(std::make_pair( 7022 CanonicalNewCtorType, 7023 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7024 if (!result.second) { 7025 // Already in the map. If it came from a different class, that's an 7026 // error. Not if it's from the same. 7027 CanQualType PreviousBase = result.first->second.first; 7028 if (CanonicalBase != PreviousBase) { 7029 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7030 const CXXConstructorDecl *PrevBaseCtor = 7031 PrevCtor->getInheritedConstructor(); 7032 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7033 7034 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7035 Diag(BaseCtor->getLocation(), 7036 diag::note_using_decl_constructor_conflict_current_ctor); 7037 Diag(PrevBaseCtor->getLocation(), 7038 diag::note_using_decl_constructor_conflict_previous_ctor); 7039 Diag(PrevCtor->getLocation(), 7040 diag::note_using_decl_constructor_conflict_previous_using); 7041 } 7042 continue; 7043 } 7044 7045 // OK, we're there, now add the constructor. 7046 // C++0x [class.inhctor]p8: [...] that would be performed by a 7047 // user-written inline constructor [...] 7048 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7049 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7050 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7051 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7052 /*ImplicitlyDeclared=*/true, 7053 // FIXME: Due to a defect in the standard, we treat inherited 7054 // constructors as constexpr even if that makes them ill-formed. 7055 /*Constexpr=*/BaseCtor->isConstexpr()); 7056 NewCtor->setAccess(BaseCtor->getAccess()); 7057 7058 // Build up the parameter decls and add them. 7059 SmallVector<ParmVarDecl *, 16> ParamDecls; 7060 for (unsigned i = 0; i < params; ++i) { 7061 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7062 UsingLoc, UsingLoc, 7063 /*IdentifierInfo=*/0, 7064 BaseCtorType->getArgType(i), 7065 /*TInfo=*/0, SC_None, 7066 SC_None, /*DefaultArg=*/0)); 7067 } 7068 NewCtor->setParams(ParamDecls); 7069 NewCtor->setInheritedConstructor(BaseCtor); 7070 7071 ClassDecl->addDecl(NewCtor); 7072 result.first->second.second = NewCtor; 7073 } 7074 } 7075 } 7076} 7077 7078Sema::ImplicitExceptionSpecification 7079Sema::ComputeDefaultedDtorExceptionSpec(CXXMethodDecl *MD) { 7080 CXXRecordDecl *ClassDecl = MD->getParent(); 7081 7082 // C++ [except.spec]p14: 7083 // An implicitly declared special member function (Clause 12) shall have 7084 // an exception-specification. 7085 ImplicitExceptionSpecification ExceptSpec(*this); 7086 if (ClassDecl->isInvalidDecl()) 7087 return ExceptSpec; 7088 7089 // Direct base-class destructors. 7090 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7091 BEnd = ClassDecl->bases_end(); 7092 B != BEnd; ++B) { 7093 if (B->isVirtual()) // Handled below. 7094 continue; 7095 7096 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7097 ExceptSpec.CalledDecl(B->getLocStart(), 7098 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7099 } 7100 7101 // Virtual base-class destructors. 7102 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7103 BEnd = ClassDecl->vbases_end(); 7104 B != BEnd; ++B) { 7105 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7106 ExceptSpec.CalledDecl(B->getLocStart(), 7107 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7108 } 7109 7110 // Field destructors. 7111 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7112 FEnd = ClassDecl->field_end(); 7113 F != FEnd; ++F) { 7114 if (const RecordType *RecordTy 7115 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7116 ExceptSpec.CalledDecl(F->getLocation(), 7117 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7118 } 7119 7120 return ExceptSpec; 7121} 7122 7123CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7124 // C++ [class.dtor]p2: 7125 // If a class has no user-declared destructor, a destructor is 7126 // declared implicitly. An implicitly-declared destructor is an 7127 // inline public member of its class. 7128 7129 // Create the actual destructor declaration. 7130 CanQualType ClassType 7131 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7132 SourceLocation ClassLoc = ClassDecl->getLocation(); 7133 DeclarationName Name 7134 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7135 DeclarationNameInfo NameInfo(Name, ClassLoc); 7136 CXXDestructorDecl *Destructor 7137 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7138 QualType(), 0, /*isInline=*/true, 7139 /*isImplicitlyDeclared=*/true); 7140 Destructor->setAccess(AS_public); 7141 Destructor->setDefaulted(); 7142 Destructor->setImplicit(); 7143 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7144 7145 // Build an exception specification pointing back at this destructor. 7146 FunctionProtoType::ExtProtoInfo EPI; 7147 EPI.ExceptionSpecType = EST_Unevaluated; 7148 EPI.ExceptionSpecDecl = Destructor; 7149 Destructor->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7150 7151 // Note that we have declared this destructor. 7152 ++ASTContext::NumImplicitDestructorsDeclared; 7153 7154 // Introduce this destructor into its scope. 7155 if (Scope *S = getScopeForContext(ClassDecl)) 7156 PushOnScopeChains(Destructor, S, false); 7157 ClassDecl->addDecl(Destructor); 7158 7159 AddOverriddenMethods(ClassDecl, Destructor); 7160 7161 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 7162 Destructor->setDeletedAsWritten(); 7163 7164 return Destructor; 7165} 7166 7167void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7168 CXXDestructorDecl *Destructor) { 7169 assert((Destructor->isDefaulted() && 7170 !Destructor->doesThisDeclarationHaveABody() && 7171 !Destructor->isDeleted()) && 7172 "DefineImplicitDestructor - call it for implicit default dtor"); 7173 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7174 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7175 7176 if (Destructor->isInvalidDecl()) 7177 return; 7178 7179 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7180 7181 DiagnosticErrorTrap Trap(Diags); 7182 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7183 Destructor->getParent()); 7184 7185 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7186 Diag(CurrentLocation, diag::note_member_synthesized_at) 7187 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7188 7189 Destructor->setInvalidDecl(); 7190 return; 7191 } 7192 7193 SourceLocation Loc = Destructor->getLocation(); 7194 Destructor->setBody(new (Context) CompoundStmt(Loc)); 7195 Destructor->setImplicitlyDefined(true); 7196 Destructor->setUsed(); 7197 MarkVTableUsed(CurrentLocation, ClassDecl); 7198 7199 if (ASTMutationListener *L = getASTMutationListener()) { 7200 L->CompletedImplicitDefinition(Destructor); 7201 } 7202} 7203 7204/// \brief Perform any semantic analysis which needs to be delayed until all 7205/// pending class member declarations have been parsed. 7206void Sema::ActOnFinishCXXMemberDecls() { 7207 // Perform any deferred checking of exception specifications for virtual 7208 // destructors. 7209 for (unsigned i = 0, e = DelayedDestructorExceptionSpecChecks.size(); 7210 i != e; ++i) { 7211 const CXXDestructorDecl *Dtor = 7212 DelayedDestructorExceptionSpecChecks[i].first; 7213 assert(!Dtor->getParent()->isDependentType() && 7214 "Should not ever add destructors of templates into the list."); 7215 CheckOverridingFunctionExceptionSpec(Dtor, 7216 DelayedDestructorExceptionSpecChecks[i].second); 7217 } 7218 DelayedDestructorExceptionSpecChecks.clear(); 7219} 7220 7221void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *ClassDecl, 7222 CXXDestructorDecl *Destructor) { 7223 assert(getLangOpts().CPlusPlus0x && 7224 "adjusting dtor exception specs was introduced in c++11"); 7225 7226 // C++11 [class.dtor]p3: 7227 // A declaration of a destructor that does not have an exception- 7228 // specification is implicitly considered to have the same exception- 7229 // specification as an implicit declaration. 7230 const FunctionProtoType *DtorType = Destructor->getType()-> 7231 getAs<FunctionProtoType>(); 7232 if (DtorType->hasExceptionSpec()) 7233 return; 7234 7235 // Replace the destructor's type, building off the existing one. Fortunately, 7236 // the only thing of interest in the destructor type is its extended info. 7237 // The return and arguments are fixed. 7238 FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo(); 7239 EPI.ExceptionSpecType = EST_Unevaluated; 7240 EPI.ExceptionSpecDecl = Destructor; 7241 Destructor->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7242 7243 // FIXME: If the destructor has a body that could throw, and the newly created 7244 // spec doesn't allow exceptions, we should emit a warning, because this 7245 // change in behavior can break conforming C++03 programs at runtime. 7246 // However, we don't have a body or an exception specification yet, so it 7247 // needs to be done somewhere else. 7248} 7249 7250/// \brief Builds a statement that copies/moves the given entity from \p From to 7251/// \c To. 7252/// 7253/// This routine is used to copy/move the members of a class with an 7254/// implicitly-declared copy/move assignment operator. When the entities being 7255/// copied are arrays, this routine builds for loops to copy them. 7256/// 7257/// \param S The Sema object used for type-checking. 7258/// 7259/// \param Loc The location where the implicit copy/move is being generated. 7260/// 7261/// \param T The type of the expressions being copied/moved. Both expressions 7262/// must have this type. 7263/// 7264/// \param To The expression we are copying/moving to. 7265/// 7266/// \param From The expression we are copying/moving from. 7267/// 7268/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7269/// Otherwise, it's a non-static member subobject. 7270/// 7271/// \param Copying Whether we're copying or moving. 7272/// 7273/// \param Depth Internal parameter recording the depth of the recursion. 7274/// 7275/// \returns A statement or a loop that copies the expressions. 7276static StmtResult 7277BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7278 Expr *To, Expr *From, 7279 bool CopyingBaseSubobject, bool Copying, 7280 unsigned Depth = 0) { 7281 // C++0x [class.copy]p28: 7282 // Each subobject is assigned in the manner appropriate to its type: 7283 // 7284 // - if the subobject is of class type, as if by a call to operator= with 7285 // the subobject as the object expression and the corresponding 7286 // subobject of x as a single function argument (as if by explicit 7287 // qualification; that is, ignoring any possible virtual overriding 7288 // functions in more derived classes); 7289 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7290 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7291 7292 // Look for operator=. 7293 DeclarationName Name 7294 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7295 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7296 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7297 7298 // Filter out any result that isn't a copy/move-assignment operator. 7299 LookupResult::Filter F = OpLookup.makeFilter(); 7300 while (F.hasNext()) { 7301 NamedDecl *D = F.next(); 7302 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7303 if (Method->isCopyAssignmentOperator() || 7304 (!Copying && Method->isMoveAssignmentOperator())) 7305 continue; 7306 7307 F.erase(); 7308 } 7309 F.done(); 7310 7311 // Suppress the protected check (C++ [class.protected]) for each of the 7312 // assignment operators we found. This strange dance is required when 7313 // we're assigning via a base classes's copy-assignment operator. To 7314 // ensure that we're getting the right base class subobject (without 7315 // ambiguities), we need to cast "this" to that subobject type; to 7316 // ensure that we don't go through the virtual call mechanism, we need 7317 // to qualify the operator= name with the base class (see below). However, 7318 // this means that if the base class has a protected copy assignment 7319 // operator, the protected member access check will fail. So, we 7320 // rewrite "protected" access to "public" access in this case, since we 7321 // know by construction that we're calling from a derived class. 7322 if (CopyingBaseSubobject) { 7323 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7324 L != LEnd; ++L) { 7325 if (L.getAccess() == AS_protected) 7326 L.setAccess(AS_public); 7327 } 7328 } 7329 7330 // Create the nested-name-specifier that will be used to qualify the 7331 // reference to operator=; this is required to suppress the virtual 7332 // call mechanism. 7333 CXXScopeSpec SS; 7334 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 7335 SS.MakeTrivial(S.Context, 7336 NestedNameSpecifier::Create(S.Context, 0, false, 7337 CanonicalT), 7338 Loc); 7339 7340 // Create the reference to operator=. 7341 ExprResult OpEqualRef 7342 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7343 /*TemplateKWLoc=*/SourceLocation(), 7344 /*FirstQualifierInScope=*/0, 7345 OpLookup, 7346 /*TemplateArgs=*/0, 7347 /*SuppressQualifierCheck=*/true); 7348 if (OpEqualRef.isInvalid()) 7349 return StmtError(); 7350 7351 // Build the call to the assignment operator. 7352 7353 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7354 OpEqualRef.takeAs<Expr>(), 7355 Loc, &From, 1, Loc); 7356 if (Call.isInvalid()) 7357 return StmtError(); 7358 7359 return S.Owned(Call.takeAs<Stmt>()); 7360 } 7361 7362 // - if the subobject is of scalar type, the built-in assignment 7363 // operator is used. 7364 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7365 if (!ArrayTy) { 7366 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7367 if (Assignment.isInvalid()) 7368 return StmtError(); 7369 7370 return S.Owned(Assignment.takeAs<Stmt>()); 7371 } 7372 7373 // - if the subobject is an array, each element is assigned, in the 7374 // manner appropriate to the element type; 7375 7376 // Construct a loop over the array bounds, e.g., 7377 // 7378 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7379 // 7380 // that will copy each of the array elements. 7381 QualType SizeType = S.Context.getSizeType(); 7382 7383 // Create the iteration variable. 7384 IdentifierInfo *IterationVarName = 0; 7385 { 7386 SmallString<8> Str; 7387 llvm::raw_svector_ostream OS(Str); 7388 OS << "__i" << Depth; 7389 IterationVarName = &S.Context.Idents.get(OS.str()); 7390 } 7391 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7392 IterationVarName, SizeType, 7393 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7394 SC_None, SC_None); 7395 7396 // Initialize the iteration variable to zero. 7397 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7398 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7399 7400 // Create a reference to the iteration variable; we'll use this several 7401 // times throughout. 7402 Expr *IterationVarRef 7403 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 7404 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7405 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 7406 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 7407 7408 // Create the DeclStmt that holds the iteration variable. 7409 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7410 7411 // Create the comparison against the array bound. 7412 llvm::APInt Upper 7413 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7414 Expr *Comparison 7415 = new (S.Context) BinaryOperator(IterationVarRefRVal, 7416 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7417 BO_NE, S.Context.BoolTy, 7418 VK_RValue, OK_Ordinary, Loc); 7419 7420 // Create the pre-increment of the iteration variable. 7421 Expr *Increment 7422 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7423 VK_LValue, OK_Ordinary, Loc); 7424 7425 // Subscript the "from" and "to" expressions with the iteration variable. 7426 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7427 IterationVarRefRVal, 7428 Loc)); 7429 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7430 IterationVarRefRVal, 7431 Loc)); 7432 if (!Copying) // Cast to rvalue 7433 From = CastForMoving(S, From); 7434 7435 // Build the copy/move for an individual element of the array. 7436 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7437 To, From, CopyingBaseSubobject, 7438 Copying, Depth + 1); 7439 if (Copy.isInvalid()) 7440 return StmtError(); 7441 7442 // Construct the loop that copies all elements of this array. 7443 return S.ActOnForStmt(Loc, Loc, InitStmt, 7444 S.MakeFullExpr(Comparison), 7445 0, S.MakeFullExpr(Increment), 7446 Loc, Copy.take()); 7447} 7448 7449/// Determine whether an implicit copy assignment operator for ClassDecl has a 7450/// const argument. 7451/// FIXME: It ought to be possible to store this on the record. 7452static bool isImplicitCopyAssignmentArgConst(Sema &S, 7453 CXXRecordDecl *ClassDecl) { 7454 if (ClassDecl->isInvalidDecl()) 7455 return true; 7456 7457 // C++ [class.copy]p10: 7458 // If the class definition does not explicitly declare a copy 7459 // assignment operator, one is declared implicitly. 7460 // The implicitly-defined copy assignment operator for a class X 7461 // will have the form 7462 // 7463 // X& X::operator=(const X&) 7464 // 7465 // if 7466 // -- each direct base class B of X has a copy assignment operator 7467 // whose parameter is of type const B&, const volatile B& or B, 7468 // and 7469 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7470 BaseEnd = ClassDecl->bases_end(); 7471 Base != BaseEnd; ++Base) { 7472 // We'll handle this below 7473 if (S.getLangOpts().CPlusPlus0x && Base->isVirtual()) 7474 continue; 7475 7476 assert(!Base->getType()->isDependentType() && 7477 "Cannot generate implicit members for class with dependent bases."); 7478 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7479 if (!S.LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0)) 7480 return false; 7481 } 7482 7483 // In C++11, the above citation has "or virtual" added 7484 if (S.getLangOpts().CPlusPlus0x) { 7485 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7486 BaseEnd = ClassDecl->vbases_end(); 7487 Base != BaseEnd; ++Base) { 7488 assert(!Base->getType()->isDependentType() && 7489 "Cannot generate implicit members for class with dependent bases."); 7490 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7491 if (!S.LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, 7492 false, 0)) 7493 return false; 7494 } 7495 } 7496 7497 // -- for all the nonstatic data members of X that are of a class 7498 // type M (or array thereof), each such class type has a copy 7499 // assignment operator whose parameter is of type const M&, 7500 // const volatile M& or M. 7501 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7502 FieldEnd = ClassDecl->field_end(); 7503 Field != FieldEnd; ++Field) { 7504 QualType FieldType = S.Context.getBaseElementType(Field->getType()); 7505 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) 7506 if (!S.LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, 7507 false, 0)) 7508 return false; 7509 } 7510 7511 // Otherwise, the implicitly declared copy assignment operator will 7512 // have the form 7513 // 7514 // X& X::operator=(X&) 7515 7516 return true; 7517} 7518 7519Sema::ImplicitExceptionSpecification 7520Sema::ComputeDefaultedCopyAssignmentExceptionSpec(CXXMethodDecl *MD) { 7521 CXXRecordDecl *ClassDecl = MD->getParent(); 7522 7523 ImplicitExceptionSpecification ExceptSpec(*this); 7524 if (ClassDecl->isInvalidDecl()) 7525 return ExceptSpec; 7526 7527 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 7528 assert(T->getNumArgs() == 1 && "not a copy assignment op"); 7529 unsigned ArgQuals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 7530 7531 // C++ [except.spec]p14: 7532 // An implicitly declared special member function (Clause 12) shall have an 7533 // exception-specification. [...] 7534 7535 // It is unspecified whether or not an implicit copy assignment operator 7536 // attempts to deduplicate calls to assignment operators of virtual bases are 7537 // made. As such, this exception specification is effectively unspecified. 7538 // Based on a similar decision made for constness in C++0x, we're erring on 7539 // the side of assuming such calls to be made regardless of whether they 7540 // actually happen. 7541 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7542 BaseEnd = ClassDecl->bases_end(); 7543 Base != BaseEnd; ++Base) { 7544 if (Base->isVirtual()) 7545 continue; 7546 7547 CXXRecordDecl *BaseClassDecl 7548 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7549 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7550 ArgQuals, false, 0)) 7551 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7552 } 7553 7554 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7555 BaseEnd = ClassDecl->vbases_end(); 7556 Base != BaseEnd; ++Base) { 7557 CXXRecordDecl *BaseClassDecl 7558 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7559 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7560 ArgQuals, false, 0)) 7561 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7562 } 7563 7564 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7565 FieldEnd = ClassDecl->field_end(); 7566 Field != FieldEnd; 7567 ++Field) { 7568 QualType FieldType = Context.getBaseElementType(Field->getType()); 7569 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7570 if (CXXMethodDecl *CopyAssign = 7571 LookupCopyingAssignment(FieldClassDecl, 7572 ArgQuals | FieldType.getCVRQualifiers(), 7573 false, 0)) 7574 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign); 7575 } 7576 } 7577 7578 return ExceptSpec; 7579} 7580 7581CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7582 // Note: The following rules are largely analoguous to the copy 7583 // constructor rules. Note that virtual bases are not taken into account 7584 // for determining the argument type of the operator. Note also that 7585 // operators taking an object instead of a reference are allowed. 7586 7587 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7588 QualType RetType = Context.getLValueReferenceType(ArgType); 7589 if (isImplicitCopyAssignmentArgConst(*this, ClassDecl)) 7590 ArgType = ArgType.withConst(); 7591 ArgType = Context.getLValueReferenceType(ArgType); 7592 7593 // An implicitly-declared copy assignment operator is an inline public 7594 // member of its class. 7595 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7596 SourceLocation ClassLoc = ClassDecl->getLocation(); 7597 DeclarationNameInfo NameInfo(Name, ClassLoc); 7598 CXXMethodDecl *CopyAssignment 7599 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 7600 /*TInfo=*/0, /*isStatic=*/false, 7601 /*StorageClassAsWritten=*/SC_None, 7602 /*isInline=*/true, /*isConstexpr=*/false, 7603 SourceLocation()); 7604 CopyAssignment->setAccess(AS_public); 7605 CopyAssignment->setDefaulted(); 7606 CopyAssignment->setImplicit(); 7607 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7608 7609 // Build an exception specification pointing back at this member. 7610 FunctionProtoType::ExtProtoInfo EPI; 7611 EPI.ExceptionSpecType = EST_Unevaluated; 7612 EPI.ExceptionSpecDecl = CopyAssignment; 7613 CopyAssignment->setType(Context.getFunctionType(RetType, &ArgType, 1, EPI)); 7614 7615 // Add the parameter to the operator. 7616 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7617 ClassLoc, ClassLoc, /*Id=*/0, 7618 ArgType, /*TInfo=*/0, 7619 SC_None, 7620 SC_None, 0); 7621 CopyAssignment->setParams(FromParam); 7622 7623 // Note that we have added this copy-assignment operator. 7624 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7625 7626 if (Scope *S = getScopeForContext(ClassDecl)) 7627 PushOnScopeChains(CopyAssignment, S, false); 7628 ClassDecl->addDecl(CopyAssignment); 7629 7630 // C++0x [class.copy]p19: 7631 // .... If the class definition does not explicitly declare a copy 7632 // assignment operator, there is no user-declared move constructor, and 7633 // there is no user-declared move assignment operator, a copy assignment 7634 // operator is implicitly declared as defaulted. 7635 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 7636 CopyAssignment->setDeletedAsWritten(); 7637 7638 AddOverriddenMethods(ClassDecl, CopyAssignment); 7639 return CopyAssignment; 7640} 7641 7642void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7643 CXXMethodDecl *CopyAssignOperator) { 7644 assert((CopyAssignOperator->isDefaulted() && 7645 CopyAssignOperator->isOverloadedOperator() && 7646 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7647 !CopyAssignOperator->doesThisDeclarationHaveABody() && 7648 !CopyAssignOperator->isDeleted()) && 7649 "DefineImplicitCopyAssignment called for wrong function"); 7650 7651 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7652 7653 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7654 CopyAssignOperator->setInvalidDecl(); 7655 return; 7656 } 7657 7658 CopyAssignOperator->setUsed(); 7659 7660 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7661 DiagnosticErrorTrap Trap(Diags); 7662 7663 // C++0x [class.copy]p30: 7664 // The implicitly-defined or explicitly-defaulted copy assignment operator 7665 // for a non-union class X performs memberwise copy assignment of its 7666 // subobjects. The direct base classes of X are assigned first, in the 7667 // order of their declaration in the base-specifier-list, and then the 7668 // immediate non-static data members of X are assigned, in the order in 7669 // which they were declared in the class definition. 7670 7671 // The statements that form the synthesized function body. 7672 ASTOwningVector<Stmt*> Statements(*this); 7673 7674 // The parameter for the "other" object, which we are copying from. 7675 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7676 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7677 QualType OtherRefType = Other->getType(); 7678 if (const LValueReferenceType *OtherRef 7679 = OtherRefType->getAs<LValueReferenceType>()) { 7680 OtherRefType = OtherRef->getPointeeType(); 7681 OtherQuals = OtherRefType.getQualifiers(); 7682 } 7683 7684 // Our location for everything implicitly-generated. 7685 SourceLocation Loc = CopyAssignOperator->getLocation(); 7686 7687 // Construct a reference to the "other" object. We'll be using this 7688 // throughout the generated ASTs. 7689 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7690 assert(OtherRef && "Reference to parameter cannot fail!"); 7691 7692 // Construct the "this" pointer. We'll be using this throughout the generated 7693 // ASTs. 7694 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7695 assert(This && "Reference to this cannot fail!"); 7696 7697 // Assign base classes. 7698 bool Invalid = false; 7699 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7700 E = ClassDecl->bases_end(); Base != E; ++Base) { 7701 // Form the assignment: 7702 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7703 QualType BaseType = Base->getType().getUnqualifiedType(); 7704 if (!BaseType->isRecordType()) { 7705 Invalid = true; 7706 continue; 7707 } 7708 7709 CXXCastPath BasePath; 7710 BasePath.push_back(Base); 7711 7712 // Construct the "from" expression, which is an implicit cast to the 7713 // appropriately-qualified base type. 7714 Expr *From = OtherRef; 7715 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7716 CK_UncheckedDerivedToBase, 7717 VK_LValue, &BasePath).take(); 7718 7719 // Dereference "this". 7720 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7721 7722 // Implicitly cast "this" to the appropriately-qualified base type. 7723 To = ImpCastExprToType(To.take(), 7724 Context.getCVRQualifiedType(BaseType, 7725 CopyAssignOperator->getTypeQualifiers()), 7726 CK_UncheckedDerivedToBase, 7727 VK_LValue, &BasePath); 7728 7729 // Build the copy. 7730 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7731 To.get(), From, 7732 /*CopyingBaseSubobject=*/true, 7733 /*Copying=*/true); 7734 if (Copy.isInvalid()) { 7735 Diag(CurrentLocation, diag::note_member_synthesized_at) 7736 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7737 CopyAssignOperator->setInvalidDecl(); 7738 return; 7739 } 7740 7741 // Success! Record the copy. 7742 Statements.push_back(Copy.takeAs<Expr>()); 7743 } 7744 7745 // \brief Reference to the __builtin_memcpy function. 7746 Expr *BuiltinMemCpyRef = 0; 7747 // \brief Reference to the __builtin_objc_memmove_collectable function. 7748 Expr *CollectableMemCpyRef = 0; 7749 7750 // Assign non-static members. 7751 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7752 FieldEnd = ClassDecl->field_end(); 7753 Field != FieldEnd; ++Field) { 7754 if (Field->isUnnamedBitfield()) 7755 continue; 7756 7757 // Check for members of reference type; we can't copy those. 7758 if (Field->getType()->isReferenceType()) { 7759 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7760 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7761 Diag(Field->getLocation(), diag::note_declared_at); 7762 Diag(CurrentLocation, diag::note_member_synthesized_at) 7763 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7764 Invalid = true; 7765 continue; 7766 } 7767 7768 // Check for members of const-qualified, non-class type. 7769 QualType BaseType = Context.getBaseElementType(Field->getType()); 7770 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7771 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7772 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7773 Diag(Field->getLocation(), diag::note_declared_at); 7774 Diag(CurrentLocation, diag::note_member_synthesized_at) 7775 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7776 Invalid = true; 7777 continue; 7778 } 7779 7780 // Suppress assigning zero-width bitfields. 7781 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7782 continue; 7783 7784 QualType FieldType = Field->getType().getNonReferenceType(); 7785 if (FieldType->isIncompleteArrayType()) { 7786 assert(ClassDecl->hasFlexibleArrayMember() && 7787 "Incomplete array type is not valid"); 7788 continue; 7789 } 7790 7791 // Build references to the field in the object we're copying from and to. 7792 CXXScopeSpec SS; // Intentionally empty 7793 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7794 LookupMemberName); 7795 MemberLookup.addDecl(*Field); 7796 MemberLookup.resolveKind(); 7797 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7798 Loc, /*IsArrow=*/false, 7799 SS, SourceLocation(), 0, 7800 MemberLookup, 0); 7801 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7802 Loc, /*IsArrow=*/true, 7803 SS, SourceLocation(), 0, 7804 MemberLookup, 0); 7805 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7806 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7807 7808 // If the field should be copied with __builtin_memcpy rather than via 7809 // explicit assignments, do so. This optimization only applies for arrays 7810 // of scalars and arrays of class type with trivial copy-assignment 7811 // operators. 7812 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7813 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7814 // Compute the size of the memory buffer to be copied. 7815 QualType SizeType = Context.getSizeType(); 7816 llvm::APInt Size(Context.getTypeSize(SizeType), 7817 Context.getTypeSizeInChars(BaseType).getQuantity()); 7818 for (const ConstantArrayType *Array 7819 = Context.getAsConstantArrayType(FieldType); 7820 Array; 7821 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7822 llvm::APInt ArraySize 7823 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7824 Size *= ArraySize; 7825 } 7826 7827 // Take the address of the field references for "from" and "to". 7828 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7829 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7830 7831 bool NeedsCollectableMemCpy = 7832 (BaseType->isRecordType() && 7833 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7834 7835 if (NeedsCollectableMemCpy) { 7836 if (!CollectableMemCpyRef) { 7837 // Create a reference to the __builtin_objc_memmove_collectable function. 7838 LookupResult R(*this, 7839 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7840 Loc, LookupOrdinaryName); 7841 LookupName(R, TUScope, true); 7842 7843 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7844 if (!CollectableMemCpy) { 7845 // Something went horribly wrong earlier, and we will have 7846 // complained about it. 7847 Invalid = true; 7848 continue; 7849 } 7850 7851 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7852 CollectableMemCpy->getType(), 7853 VK_LValue, Loc, 0).take(); 7854 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7855 } 7856 } 7857 // Create a reference to the __builtin_memcpy builtin function. 7858 else if (!BuiltinMemCpyRef) { 7859 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7860 LookupOrdinaryName); 7861 LookupName(R, TUScope, true); 7862 7863 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7864 if (!BuiltinMemCpy) { 7865 // Something went horribly wrong earlier, and we will have complained 7866 // about it. 7867 Invalid = true; 7868 continue; 7869 } 7870 7871 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7872 BuiltinMemCpy->getType(), 7873 VK_LValue, Loc, 0).take(); 7874 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7875 } 7876 7877 ASTOwningVector<Expr*> CallArgs(*this); 7878 CallArgs.push_back(To.takeAs<Expr>()); 7879 CallArgs.push_back(From.takeAs<Expr>()); 7880 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7881 ExprResult Call = ExprError(); 7882 if (NeedsCollectableMemCpy) 7883 Call = ActOnCallExpr(/*Scope=*/0, 7884 CollectableMemCpyRef, 7885 Loc, move_arg(CallArgs), 7886 Loc); 7887 else 7888 Call = ActOnCallExpr(/*Scope=*/0, 7889 BuiltinMemCpyRef, 7890 Loc, move_arg(CallArgs), 7891 Loc); 7892 7893 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7894 Statements.push_back(Call.takeAs<Expr>()); 7895 continue; 7896 } 7897 7898 // Build the copy of this field. 7899 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7900 To.get(), From.get(), 7901 /*CopyingBaseSubobject=*/false, 7902 /*Copying=*/true); 7903 if (Copy.isInvalid()) { 7904 Diag(CurrentLocation, diag::note_member_synthesized_at) 7905 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7906 CopyAssignOperator->setInvalidDecl(); 7907 return; 7908 } 7909 7910 // Success! Record the copy. 7911 Statements.push_back(Copy.takeAs<Stmt>()); 7912 } 7913 7914 if (!Invalid) { 7915 // Add a "return *this;" 7916 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7917 7918 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7919 if (Return.isInvalid()) 7920 Invalid = true; 7921 else { 7922 Statements.push_back(Return.takeAs<Stmt>()); 7923 7924 if (Trap.hasErrorOccurred()) { 7925 Diag(CurrentLocation, diag::note_member_synthesized_at) 7926 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7927 Invalid = true; 7928 } 7929 } 7930 } 7931 7932 if (Invalid) { 7933 CopyAssignOperator->setInvalidDecl(); 7934 return; 7935 } 7936 7937 StmtResult Body; 7938 { 7939 CompoundScopeRAII CompoundScope(*this); 7940 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7941 /*isStmtExpr=*/false); 7942 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7943 } 7944 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7945 7946 if (ASTMutationListener *L = getASTMutationListener()) { 7947 L->CompletedImplicitDefinition(CopyAssignOperator); 7948 } 7949} 7950 7951Sema::ImplicitExceptionSpecification 7952Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXMethodDecl *MD) { 7953 CXXRecordDecl *ClassDecl = MD->getParent(); 7954 7955 ImplicitExceptionSpecification ExceptSpec(*this); 7956 if (ClassDecl->isInvalidDecl()) 7957 return ExceptSpec; 7958 7959 // C++0x [except.spec]p14: 7960 // An implicitly declared special member function (Clause 12) shall have an 7961 // exception-specification. [...] 7962 7963 // It is unspecified whether or not an implicit move assignment operator 7964 // attempts to deduplicate calls to assignment operators of virtual bases are 7965 // made. As such, this exception specification is effectively unspecified. 7966 // Based on a similar decision made for constness in C++0x, we're erring on 7967 // the side of assuming such calls to be made regardless of whether they 7968 // actually happen. 7969 // Note that a move constructor is not implicitly declared when there are 7970 // virtual bases, but it can still be user-declared and explicitly defaulted. 7971 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7972 BaseEnd = ClassDecl->bases_end(); 7973 Base != BaseEnd; ++Base) { 7974 if (Base->isVirtual()) 7975 continue; 7976 7977 CXXRecordDecl *BaseClassDecl 7978 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7979 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7980 0, false, 0)) 7981 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 7982 } 7983 7984 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7985 BaseEnd = ClassDecl->vbases_end(); 7986 Base != BaseEnd; ++Base) { 7987 CXXRecordDecl *BaseClassDecl 7988 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7989 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7990 0, false, 0)) 7991 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 7992 } 7993 7994 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7995 FieldEnd = ClassDecl->field_end(); 7996 Field != FieldEnd; 7997 ++Field) { 7998 QualType FieldType = Context.getBaseElementType(Field->getType()); 7999 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8000 if (CXXMethodDecl *MoveAssign = 8001 LookupMovingAssignment(FieldClassDecl, 8002 FieldType.getCVRQualifiers(), 8003 false, 0)) 8004 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign); 8005 } 8006 } 8007 8008 return ExceptSpec; 8009} 8010 8011/// Determine whether the class type has any direct or indirect virtual base 8012/// classes which have a non-trivial move assignment operator. 8013static bool 8014hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) { 8015 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8016 BaseEnd = ClassDecl->vbases_end(); 8017 Base != BaseEnd; ++Base) { 8018 CXXRecordDecl *BaseClass = 8019 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8020 8021 // Try to declare the move assignment. If it would be deleted, then the 8022 // class does not have a non-trivial move assignment. 8023 if (BaseClass->needsImplicitMoveAssignment()) 8024 S.DeclareImplicitMoveAssignment(BaseClass); 8025 8026 // If the class has both a trivial move assignment and a non-trivial move 8027 // assignment, hasTrivialMoveAssignment() is false. 8028 if (BaseClass->hasDeclaredMoveAssignment() && 8029 !BaseClass->hasTrivialMoveAssignment()) 8030 return true; 8031 } 8032 8033 return false; 8034} 8035 8036/// Determine whether the given type either has a move constructor or is 8037/// trivially copyable. 8038static bool 8039hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) { 8040 Type = S.Context.getBaseElementType(Type); 8041 8042 // FIXME: Technically, non-trivially-copyable non-class types, such as 8043 // reference types, are supposed to return false here, but that appears 8044 // to be a standard defect. 8045 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl(); 8046 if (!ClassDecl || !ClassDecl->getDefinition()) 8047 return true; 8048 8049 if (Type.isTriviallyCopyableType(S.Context)) 8050 return true; 8051 8052 if (IsConstructor) { 8053 if (ClassDecl->needsImplicitMoveConstructor()) 8054 S.DeclareImplicitMoveConstructor(ClassDecl); 8055 return ClassDecl->hasDeclaredMoveConstructor(); 8056 } 8057 8058 if (ClassDecl->needsImplicitMoveAssignment()) 8059 S.DeclareImplicitMoveAssignment(ClassDecl); 8060 return ClassDecl->hasDeclaredMoveAssignment(); 8061} 8062 8063/// Determine whether all non-static data members and direct or virtual bases 8064/// of class \p ClassDecl have either a move operation, or are trivially 8065/// copyable. 8066static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl, 8067 bool IsConstructor) { 8068 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8069 BaseEnd = ClassDecl->bases_end(); 8070 Base != BaseEnd; ++Base) { 8071 if (Base->isVirtual()) 8072 continue; 8073 8074 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8075 return false; 8076 } 8077 8078 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8079 BaseEnd = ClassDecl->vbases_end(); 8080 Base != BaseEnd; ++Base) { 8081 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8082 return false; 8083 } 8084 8085 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8086 FieldEnd = ClassDecl->field_end(); 8087 Field != FieldEnd; ++Field) { 8088 if (!hasMoveOrIsTriviallyCopyable(S, Field->getType(), IsConstructor)) 8089 return false; 8090 } 8091 8092 return true; 8093} 8094 8095CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8096 // C++11 [class.copy]p20: 8097 // If the definition of a class X does not explicitly declare a move 8098 // assignment operator, one will be implicitly declared as defaulted 8099 // if and only if: 8100 // 8101 // - [first 4 bullets] 8102 assert(ClassDecl->needsImplicitMoveAssignment()); 8103 8104 // [Checked after we build the declaration] 8105 // - the move assignment operator would not be implicitly defined as 8106 // deleted, 8107 8108 // [DR1402]: 8109 // - X has no direct or indirect virtual base class with a non-trivial 8110 // move assignment operator, and 8111 // - each of X's non-static data members and direct or virtual base classes 8112 // has a type that either has a move assignment operator or is trivially 8113 // copyable. 8114 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) || 8115 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) { 8116 ClassDecl->setFailedImplicitMoveAssignment(); 8117 return 0; 8118 } 8119 8120 // Note: The following rules are largely analoguous to the move 8121 // constructor rules. 8122 8123 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8124 QualType RetType = Context.getLValueReferenceType(ArgType); 8125 ArgType = Context.getRValueReferenceType(ArgType); 8126 8127 // An implicitly-declared move assignment operator is an inline public 8128 // member of its class. 8129 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8130 SourceLocation ClassLoc = ClassDecl->getLocation(); 8131 DeclarationNameInfo NameInfo(Name, ClassLoc); 8132 CXXMethodDecl *MoveAssignment 8133 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 8134 /*TInfo=*/0, /*isStatic=*/false, 8135 /*StorageClassAsWritten=*/SC_None, 8136 /*isInline=*/true, 8137 /*isConstexpr=*/false, 8138 SourceLocation()); 8139 MoveAssignment->setAccess(AS_public); 8140 MoveAssignment->setDefaulted(); 8141 MoveAssignment->setImplicit(); 8142 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8143 8144 // Build an exception specification pointing back at this member. 8145 FunctionProtoType::ExtProtoInfo EPI; 8146 EPI.ExceptionSpecType = EST_Unevaluated; 8147 EPI.ExceptionSpecDecl = MoveAssignment; 8148 MoveAssignment->setType(Context.getFunctionType(RetType, &ArgType, 1, EPI)); 8149 8150 // Add the parameter to the operator. 8151 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8152 ClassLoc, ClassLoc, /*Id=*/0, 8153 ArgType, /*TInfo=*/0, 8154 SC_None, 8155 SC_None, 0); 8156 MoveAssignment->setParams(FromParam); 8157 8158 // Note that we have added this copy-assignment operator. 8159 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8160 8161 // C++0x [class.copy]p9: 8162 // If the definition of a class X does not explicitly declare a move 8163 // assignment operator, one will be implicitly declared as defaulted if and 8164 // only if: 8165 // [...] 8166 // - the move assignment operator would not be implicitly defined as 8167 // deleted. 8168 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 8169 // Cache this result so that we don't try to generate this over and over 8170 // on every lookup, leaking memory and wasting time. 8171 ClassDecl->setFailedImplicitMoveAssignment(); 8172 return 0; 8173 } 8174 8175 if (Scope *S = getScopeForContext(ClassDecl)) 8176 PushOnScopeChains(MoveAssignment, S, false); 8177 ClassDecl->addDecl(MoveAssignment); 8178 8179 AddOverriddenMethods(ClassDecl, MoveAssignment); 8180 return MoveAssignment; 8181} 8182 8183void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8184 CXXMethodDecl *MoveAssignOperator) { 8185 assert((MoveAssignOperator->isDefaulted() && 8186 MoveAssignOperator->isOverloadedOperator() && 8187 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8188 !MoveAssignOperator->doesThisDeclarationHaveABody() && 8189 !MoveAssignOperator->isDeleted()) && 8190 "DefineImplicitMoveAssignment called for wrong function"); 8191 8192 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8193 8194 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8195 MoveAssignOperator->setInvalidDecl(); 8196 return; 8197 } 8198 8199 MoveAssignOperator->setUsed(); 8200 8201 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8202 DiagnosticErrorTrap Trap(Diags); 8203 8204 // C++0x [class.copy]p28: 8205 // The implicitly-defined or move assignment operator for a non-union class 8206 // X performs memberwise move assignment of its subobjects. The direct base 8207 // classes of X are assigned first, in the order of their declaration in the 8208 // base-specifier-list, and then the immediate non-static data members of X 8209 // are assigned, in the order in which they were declared in the class 8210 // definition. 8211 8212 // The statements that form the synthesized function body. 8213 ASTOwningVector<Stmt*> Statements(*this); 8214 8215 // The parameter for the "other" object, which we are move from. 8216 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8217 QualType OtherRefType = Other->getType()-> 8218 getAs<RValueReferenceType>()->getPointeeType(); 8219 assert(OtherRefType.getQualifiers() == 0 && 8220 "Bad argument type of defaulted move assignment"); 8221 8222 // Our location for everything implicitly-generated. 8223 SourceLocation Loc = MoveAssignOperator->getLocation(); 8224 8225 // Construct a reference to the "other" object. We'll be using this 8226 // throughout the generated ASTs. 8227 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8228 assert(OtherRef && "Reference to parameter cannot fail!"); 8229 // Cast to rvalue. 8230 OtherRef = CastForMoving(*this, OtherRef); 8231 8232 // Construct the "this" pointer. We'll be using this throughout the generated 8233 // ASTs. 8234 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8235 assert(This && "Reference to this cannot fail!"); 8236 8237 // Assign base classes. 8238 bool Invalid = false; 8239 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8240 E = ClassDecl->bases_end(); Base != E; ++Base) { 8241 // Form the assignment: 8242 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8243 QualType BaseType = Base->getType().getUnqualifiedType(); 8244 if (!BaseType->isRecordType()) { 8245 Invalid = true; 8246 continue; 8247 } 8248 8249 CXXCastPath BasePath; 8250 BasePath.push_back(Base); 8251 8252 // Construct the "from" expression, which is an implicit cast to the 8253 // appropriately-qualified base type. 8254 Expr *From = OtherRef; 8255 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8256 VK_XValue, &BasePath).take(); 8257 8258 // Dereference "this". 8259 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8260 8261 // Implicitly cast "this" to the appropriately-qualified base type. 8262 To = ImpCastExprToType(To.take(), 8263 Context.getCVRQualifiedType(BaseType, 8264 MoveAssignOperator->getTypeQualifiers()), 8265 CK_UncheckedDerivedToBase, 8266 VK_LValue, &BasePath); 8267 8268 // Build the move. 8269 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8270 To.get(), From, 8271 /*CopyingBaseSubobject=*/true, 8272 /*Copying=*/false); 8273 if (Move.isInvalid()) { 8274 Diag(CurrentLocation, diag::note_member_synthesized_at) 8275 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8276 MoveAssignOperator->setInvalidDecl(); 8277 return; 8278 } 8279 8280 // Success! Record the move. 8281 Statements.push_back(Move.takeAs<Expr>()); 8282 } 8283 8284 // \brief Reference to the __builtin_memcpy function. 8285 Expr *BuiltinMemCpyRef = 0; 8286 // \brief Reference to the __builtin_objc_memmove_collectable function. 8287 Expr *CollectableMemCpyRef = 0; 8288 8289 // Assign non-static members. 8290 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8291 FieldEnd = ClassDecl->field_end(); 8292 Field != FieldEnd; ++Field) { 8293 if (Field->isUnnamedBitfield()) 8294 continue; 8295 8296 // Check for members of reference type; we can't move those. 8297 if (Field->getType()->isReferenceType()) { 8298 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8299 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8300 Diag(Field->getLocation(), diag::note_declared_at); 8301 Diag(CurrentLocation, diag::note_member_synthesized_at) 8302 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8303 Invalid = true; 8304 continue; 8305 } 8306 8307 // Check for members of const-qualified, non-class type. 8308 QualType BaseType = Context.getBaseElementType(Field->getType()); 8309 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8310 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8311 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8312 Diag(Field->getLocation(), diag::note_declared_at); 8313 Diag(CurrentLocation, diag::note_member_synthesized_at) 8314 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8315 Invalid = true; 8316 continue; 8317 } 8318 8319 // Suppress assigning zero-width bitfields. 8320 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8321 continue; 8322 8323 QualType FieldType = Field->getType().getNonReferenceType(); 8324 if (FieldType->isIncompleteArrayType()) { 8325 assert(ClassDecl->hasFlexibleArrayMember() && 8326 "Incomplete array type is not valid"); 8327 continue; 8328 } 8329 8330 // Build references to the field in the object we're copying from and to. 8331 CXXScopeSpec SS; // Intentionally empty 8332 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8333 LookupMemberName); 8334 MemberLookup.addDecl(*Field); 8335 MemberLookup.resolveKind(); 8336 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8337 Loc, /*IsArrow=*/false, 8338 SS, SourceLocation(), 0, 8339 MemberLookup, 0); 8340 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8341 Loc, /*IsArrow=*/true, 8342 SS, SourceLocation(), 0, 8343 MemberLookup, 0); 8344 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8345 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8346 8347 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8348 "Member reference with rvalue base must be rvalue except for reference " 8349 "members, which aren't allowed for move assignment."); 8350 8351 // If the field should be copied with __builtin_memcpy rather than via 8352 // explicit assignments, do so. This optimization only applies for arrays 8353 // of scalars and arrays of class type with trivial move-assignment 8354 // operators. 8355 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8356 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8357 // Compute the size of the memory buffer to be copied. 8358 QualType SizeType = Context.getSizeType(); 8359 llvm::APInt Size(Context.getTypeSize(SizeType), 8360 Context.getTypeSizeInChars(BaseType).getQuantity()); 8361 for (const ConstantArrayType *Array 8362 = Context.getAsConstantArrayType(FieldType); 8363 Array; 8364 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8365 llvm::APInt ArraySize 8366 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8367 Size *= ArraySize; 8368 } 8369 8370 // Take the address of the field references for "from" and "to". We 8371 // directly construct UnaryOperators here because semantic analysis 8372 // does not permit us to take the address of an xvalue. 8373 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8374 Context.getPointerType(From.get()->getType()), 8375 VK_RValue, OK_Ordinary, Loc); 8376 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8377 Context.getPointerType(To.get()->getType()), 8378 VK_RValue, OK_Ordinary, Loc); 8379 8380 bool NeedsCollectableMemCpy = 8381 (BaseType->isRecordType() && 8382 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8383 8384 if (NeedsCollectableMemCpy) { 8385 if (!CollectableMemCpyRef) { 8386 // Create a reference to the __builtin_objc_memmove_collectable function. 8387 LookupResult R(*this, 8388 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8389 Loc, LookupOrdinaryName); 8390 LookupName(R, TUScope, true); 8391 8392 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8393 if (!CollectableMemCpy) { 8394 // Something went horribly wrong earlier, and we will have 8395 // complained about it. 8396 Invalid = true; 8397 continue; 8398 } 8399 8400 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8401 CollectableMemCpy->getType(), 8402 VK_LValue, Loc, 0).take(); 8403 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8404 } 8405 } 8406 // Create a reference to the __builtin_memcpy builtin function. 8407 else if (!BuiltinMemCpyRef) { 8408 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8409 LookupOrdinaryName); 8410 LookupName(R, TUScope, true); 8411 8412 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8413 if (!BuiltinMemCpy) { 8414 // Something went horribly wrong earlier, and we will have complained 8415 // about it. 8416 Invalid = true; 8417 continue; 8418 } 8419 8420 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8421 BuiltinMemCpy->getType(), 8422 VK_LValue, Loc, 0).take(); 8423 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8424 } 8425 8426 ASTOwningVector<Expr*> CallArgs(*this); 8427 CallArgs.push_back(To.takeAs<Expr>()); 8428 CallArgs.push_back(From.takeAs<Expr>()); 8429 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8430 ExprResult Call = ExprError(); 8431 if (NeedsCollectableMemCpy) 8432 Call = ActOnCallExpr(/*Scope=*/0, 8433 CollectableMemCpyRef, 8434 Loc, move_arg(CallArgs), 8435 Loc); 8436 else 8437 Call = ActOnCallExpr(/*Scope=*/0, 8438 BuiltinMemCpyRef, 8439 Loc, move_arg(CallArgs), 8440 Loc); 8441 8442 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8443 Statements.push_back(Call.takeAs<Expr>()); 8444 continue; 8445 } 8446 8447 // Build the move of this field. 8448 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8449 To.get(), From.get(), 8450 /*CopyingBaseSubobject=*/false, 8451 /*Copying=*/false); 8452 if (Move.isInvalid()) { 8453 Diag(CurrentLocation, diag::note_member_synthesized_at) 8454 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8455 MoveAssignOperator->setInvalidDecl(); 8456 return; 8457 } 8458 8459 // Success! Record the copy. 8460 Statements.push_back(Move.takeAs<Stmt>()); 8461 } 8462 8463 if (!Invalid) { 8464 // Add a "return *this;" 8465 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8466 8467 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8468 if (Return.isInvalid()) 8469 Invalid = true; 8470 else { 8471 Statements.push_back(Return.takeAs<Stmt>()); 8472 8473 if (Trap.hasErrorOccurred()) { 8474 Diag(CurrentLocation, diag::note_member_synthesized_at) 8475 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8476 Invalid = true; 8477 } 8478 } 8479 } 8480 8481 if (Invalid) { 8482 MoveAssignOperator->setInvalidDecl(); 8483 return; 8484 } 8485 8486 StmtResult Body; 8487 { 8488 CompoundScopeRAII CompoundScope(*this); 8489 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8490 /*isStmtExpr=*/false); 8491 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8492 } 8493 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8494 8495 if (ASTMutationListener *L = getASTMutationListener()) { 8496 L->CompletedImplicitDefinition(MoveAssignOperator); 8497 } 8498} 8499 8500/// Determine whether an implicit copy constructor for ClassDecl has a const 8501/// argument. 8502/// FIXME: It ought to be possible to store this on the record. 8503static bool isImplicitCopyCtorArgConst(Sema &S, CXXRecordDecl *ClassDecl) { 8504 if (ClassDecl->isInvalidDecl()) 8505 return true; 8506 8507 // C++ [class.copy]p5: 8508 // The implicitly-declared copy constructor for a class X will 8509 // have the form 8510 // 8511 // X::X(const X&) 8512 // 8513 // if 8514 // -- each direct or virtual base class B of X has a copy 8515 // constructor whose first parameter is of type const B& or 8516 // const volatile B&, and 8517 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8518 BaseEnd = ClassDecl->bases_end(); 8519 Base != BaseEnd; ++Base) { 8520 // Virtual bases are handled below. 8521 if (Base->isVirtual()) 8522 continue; 8523 8524 CXXRecordDecl *BaseClassDecl 8525 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8526 // FIXME: This lookup is wrong. If the copy ctor for a member or base is 8527 // ambiguous, we should still produce a constructor with a const-qualified 8528 // parameter. 8529 if (!S.LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const)) 8530 return false; 8531 } 8532 8533 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8534 BaseEnd = ClassDecl->vbases_end(); 8535 Base != BaseEnd; ++Base) { 8536 CXXRecordDecl *BaseClassDecl 8537 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8538 if (!S.LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const)) 8539 return false; 8540 } 8541 8542 // -- for all the nonstatic data members of X that are of a 8543 // class type M (or array thereof), each such class type 8544 // has a copy constructor whose first parameter is of type 8545 // const M& or const volatile M&. 8546 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8547 FieldEnd = ClassDecl->field_end(); 8548 Field != FieldEnd; ++Field) { 8549 QualType FieldType = S.Context.getBaseElementType(Field->getType()); 8550 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8551 if (!S.LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const)) 8552 return false; 8553 } 8554 } 8555 8556 // Otherwise, the implicitly declared copy constructor will have 8557 // the form 8558 // 8559 // X::X(X&) 8560 8561 return true; 8562} 8563 8564Sema::ImplicitExceptionSpecification 8565Sema::ComputeDefaultedCopyCtorExceptionSpec(CXXMethodDecl *MD) { 8566 CXXRecordDecl *ClassDecl = MD->getParent(); 8567 8568 ImplicitExceptionSpecification ExceptSpec(*this); 8569 if (ClassDecl->isInvalidDecl()) 8570 return ExceptSpec; 8571 8572 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 8573 assert(T->getNumArgs() >= 1 && "not a copy ctor"); 8574 unsigned Quals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 8575 8576 // C++ [except.spec]p14: 8577 // An implicitly declared special member function (Clause 12) shall have an 8578 // exception-specification. [...] 8579 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8580 BaseEnd = ClassDecl->bases_end(); 8581 Base != BaseEnd; 8582 ++Base) { 8583 // Virtual bases are handled below. 8584 if (Base->isVirtual()) 8585 continue; 8586 8587 CXXRecordDecl *BaseClassDecl 8588 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8589 if (CXXConstructorDecl *CopyConstructor = 8590 LookupCopyingConstructor(BaseClassDecl, Quals)) 8591 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8592 } 8593 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8594 BaseEnd = ClassDecl->vbases_end(); 8595 Base != BaseEnd; 8596 ++Base) { 8597 CXXRecordDecl *BaseClassDecl 8598 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8599 if (CXXConstructorDecl *CopyConstructor = 8600 LookupCopyingConstructor(BaseClassDecl, Quals)) 8601 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8602 } 8603 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8604 FieldEnd = ClassDecl->field_end(); 8605 Field != FieldEnd; 8606 ++Field) { 8607 QualType FieldType = Context.getBaseElementType(Field->getType()); 8608 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8609 if (CXXConstructorDecl *CopyConstructor = 8610 LookupCopyingConstructor(FieldClassDecl, 8611 Quals | FieldType.getCVRQualifiers())) 8612 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor); 8613 } 8614 } 8615 8616 return ExceptSpec; 8617} 8618 8619CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8620 CXXRecordDecl *ClassDecl) { 8621 // C++ [class.copy]p4: 8622 // If the class definition does not explicitly declare a copy 8623 // constructor, one is declared implicitly. 8624 8625 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8626 QualType ArgType = ClassType; 8627 bool Const = isImplicitCopyCtorArgConst(*this, ClassDecl); 8628 if (Const) 8629 ArgType = ArgType.withConst(); 8630 ArgType = Context.getLValueReferenceType(ArgType); 8631 8632 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8633 CXXCopyConstructor, 8634 Const); 8635 8636 DeclarationName Name 8637 = Context.DeclarationNames.getCXXConstructorName( 8638 Context.getCanonicalType(ClassType)); 8639 SourceLocation ClassLoc = ClassDecl->getLocation(); 8640 DeclarationNameInfo NameInfo(Name, ClassLoc); 8641 8642 // An implicitly-declared copy constructor is an inline public 8643 // member of its class. 8644 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8645 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 8646 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8647 Constexpr); 8648 CopyConstructor->setAccess(AS_public); 8649 CopyConstructor->setDefaulted(); 8650 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8651 8652 // Build an exception specification pointing back at this member. 8653 FunctionProtoType::ExtProtoInfo EPI; 8654 EPI.ExceptionSpecType = EST_Unevaluated; 8655 EPI.ExceptionSpecDecl = CopyConstructor; 8656 CopyConstructor->setType( 8657 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 8658 8659 // Note that we have declared this constructor. 8660 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8661 8662 // Add the parameter to the constructor. 8663 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8664 ClassLoc, ClassLoc, 8665 /*IdentifierInfo=*/0, 8666 ArgType, /*TInfo=*/0, 8667 SC_None, 8668 SC_None, 0); 8669 CopyConstructor->setParams(FromParam); 8670 8671 if (Scope *S = getScopeForContext(ClassDecl)) 8672 PushOnScopeChains(CopyConstructor, S, false); 8673 ClassDecl->addDecl(CopyConstructor); 8674 8675 // C++11 [class.copy]p8: 8676 // ... If the class definition does not explicitly declare a copy 8677 // constructor, there is no user-declared move constructor, and there is no 8678 // user-declared move assignment operator, a copy constructor is implicitly 8679 // declared as defaulted. 8680 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8681 CopyConstructor->setDeletedAsWritten(); 8682 8683 return CopyConstructor; 8684} 8685 8686void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8687 CXXConstructorDecl *CopyConstructor) { 8688 assert((CopyConstructor->isDefaulted() && 8689 CopyConstructor->isCopyConstructor() && 8690 !CopyConstructor->doesThisDeclarationHaveABody() && 8691 !CopyConstructor->isDeleted()) && 8692 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8693 8694 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8695 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8696 8697 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8698 DiagnosticErrorTrap Trap(Diags); 8699 8700 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8701 Trap.hasErrorOccurred()) { 8702 Diag(CurrentLocation, diag::note_member_synthesized_at) 8703 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8704 CopyConstructor->setInvalidDecl(); 8705 } else { 8706 Sema::CompoundScopeRAII CompoundScope(*this); 8707 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8708 CopyConstructor->getLocation(), 8709 MultiStmtArg(*this, 0, 0), 8710 /*isStmtExpr=*/false) 8711 .takeAs<Stmt>()); 8712 CopyConstructor->setImplicitlyDefined(true); 8713 } 8714 8715 CopyConstructor->setUsed(); 8716 if (ASTMutationListener *L = getASTMutationListener()) { 8717 L->CompletedImplicitDefinition(CopyConstructor); 8718 } 8719} 8720 8721Sema::ImplicitExceptionSpecification 8722Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXMethodDecl *MD) { 8723 CXXRecordDecl *ClassDecl = MD->getParent(); 8724 8725 // C++ [except.spec]p14: 8726 // An implicitly declared special member function (Clause 12) shall have an 8727 // exception-specification. [...] 8728 ImplicitExceptionSpecification ExceptSpec(*this); 8729 if (ClassDecl->isInvalidDecl()) 8730 return ExceptSpec; 8731 8732 // Direct base-class constructors. 8733 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8734 BEnd = ClassDecl->bases_end(); 8735 B != BEnd; ++B) { 8736 if (B->isVirtual()) // Handled below. 8737 continue; 8738 8739 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8740 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8741 CXXConstructorDecl *Constructor = 8742 LookupMovingConstructor(BaseClassDecl, 0); 8743 // If this is a deleted function, add it anyway. This might be conformant 8744 // with the standard. This might not. I'm not sure. It might not matter. 8745 if (Constructor) 8746 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8747 } 8748 } 8749 8750 // Virtual base-class constructors. 8751 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8752 BEnd = ClassDecl->vbases_end(); 8753 B != BEnd; ++B) { 8754 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8755 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8756 CXXConstructorDecl *Constructor = 8757 LookupMovingConstructor(BaseClassDecl, 0); 8758 // If this is a deleted function, add it anyway. This might be conformant 8759 // with the standard. This might not. I'm not sure. It might not matter. 8760 if (Constructor) 8761 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8762 } 8763 } 8764 8765 // Field constructors. 8766 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8767 FEnd = ClassDecl->field_end(); 8768 F != FEnd; ++F) { 8769 QualType FieldType = Context.getBaseElementType(F->getType()); 8770 if (CXXRecordDecl *FieldRecDecl = FieldType->getAsCXXRecordDecl()) { 8771 CXXConstructorDecl *Constructor = 8772 LookupMovingConstructor(FieldRecDecl, FieldType.getCVRQualifiers()); 8773 // If this is a deleted function, add it anyway. This might be conformant 8774 // with the standard. This might not. I'm not sure. It might not matter. 8775 // In particular, the problem is that this function never gets called. It 8776 // might just be ill-formed because this function attempts to refer to 8777 // a deleted function here. 8778 if (Constructor) 8779 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 8780 } 8781 } 8782 8783 return ExceptSpec; 8784} 8785 8786CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8787 CXXRecordDecl *ClassDecl) { 8788 // C++11 [class.copy]p9: 8789 // If the definition of a class X does not explicitly declare a move 8790 // constructor, one will be implicitly declared as defaulted if and only if: 8791 // 8792 // - [first 4 bullets] 8793 assert(ClassDecl->needsImplicitMoveConstructor()); 8794 8795 // [Checked after we build the declaration] 8796 // - the move assignment operator would not be implicitly defined as 8797 // deleted, 8798 8799 // [DR1402]: 8800 // - each of X's non-static data members and direct or virtual base classes 8801 // has a type that either has a move constructor or is trivially copyable. 8802 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) { 8803 ClassDecl->setFailedImplicitMoveConstructor(); 8804 return 0; 8805 } 8806 8807 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8808 QualType ArgType = Context.getRValueReferenceType(ClassType); 8809 8810 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8811 CXXMoveConstructor, 8812 false); 8813 8814 DeclarationName Name 8815 = Context.DeclarationNames.getCXXConstructorName( 8816 Context.getCanonicalType(ClassType)); 8817 SourceLocation ClassLoc = ClassDecl->getLocation(); 8818 DeclarationNameInfo NameInfo(Name, ClassLoc); 8819 8820 // C++0x [class.copy]p11: 8821 // An implicitly-declared copy/move constructor is an inline public 8822 // member of its class. 8823 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8824 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 8825 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8826 Constexpr); 8827 MoveConstructor->setAccess(AS_public); 8828 MoveConstructor->setDefaulted(); 8829 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8830 8831 // Build an exception specification pointing back at this member. 8832 FunctionProtoType::ExtProtoInfo EPI; 8833 EPI.ExceptionSpecType = EST_Unevaluated; 8834 EPI.ExceptionSpecDecl = MoveConstructor; 8835 MoveConstructor->setType( 8836 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 8837 8838 // Add the parameter to the constructor. 8839 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8840 ClassLoc, ClassLoc, 8841 /*IdentifierInfo=*/0, 8842 ArgType, /*TInfo=*/0, 8843 SC_None, 8844 SC_None, 0); 8845 MoveConstructor->setParams(FromParam); 8846 8847 // C++0x [class.copy]p9: 8848 // If the definition of a class X does not explicitly declare a move 8849 // constructor, one will be implicitly declared as defaulted if and only if: 8850 // [...] 8851 // - the move constructor would not be implicitly defined as deleted. 8852 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8853 // Cache this result so that we don't try to generate this over and over 8854 // on every lookup, leaking memory and wasting time. 8855 ClassDecl->setFailedImplicitMoveConstructor(); 8856 return 0; 8857 } 8858 8859 // Note that we have declared this constructor. 8860 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8861 8862 if (Scope *S = getScopeForContext(ClassDecl)) 8863 PushOnScopeChains(MoveConstructor, S, false); 8864 ClassDecl->addDecl(MoveConstructor); 8865 8866 return MoveConstructor; 8867} 8868 8869void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8870 CXXConstructorDecl *MoveConstructor) { 8871 assert((MoveConstructor->isDefaulted() && 8872 MoveConstructor->isMoveConstructor() && 8873 !MoveConstructor->doesThisDeclarationHaveABody() && 8874 !MoveConstructor->isDeleted()) && 8875 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8876 8877 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8878 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8879 8880 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8881 DiagnosticErrorTrap Trap(Diags); 8882 8883 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8884 Trap.hasErrorOccurred()) { 8885 Diag(CurrentLocation, diag::note_member_synthesized_at) 8886 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8887 MoveConstructor->setInvalidDecl(); 8888 } else { 8889 Sema::CompoundScopeRAII CompoundScope(*this); 8890 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8891 MoveConstructor->getLocation(), 8892 MultiStmtArg(*this, 0, 0), 8893 /*isStmtExpr=*/false) 8894 .takeAs<Stmt>()); 8895 MoveConstructor->setImplicitlyDefined(true); 8896 } 8897 8898 MoveConstructor->setUsed(); 8899 8900 if (ASTMutationListener *L = getASTMutationListener()) { 8901 L->CompletedImplicitDefinition(MoveConstructor); 8902 } 8903} 8904 8905bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 8906 return FD->isDeleted() && 8907 (FD->isDefaulted() || FD->isImplicit()) && 8908 isa<CXXMethodDecl>(FD); 8909} 8910 8911/// \brief Mark the call operator of the given lambda closure type as "used". 8912static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 8913 CXXMethodDecl *CallOperator 8914 = cast<CXXMethodDecl>( 8915 *Lambda->lookup( 8916 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).first); 8917 CallOperator->setReferenced(); 8918 CallOperator->setUsed(); 8919} 8920 8921void Sema::DefineImplicitLambdaToFunctionPointerConversion( 8922 SourceLocation CurrentLocation, 8923 CXXConversionDecl *Conv) 8924{ 8925 CXXRecordDecl *Lambda = Conv->getParent(); 8926 8927 // Make sure that the lambda call operator is marked used. 8928 markLambdaCallOperatorUsed(*this, Lambda); 8929 8930 Conv->setUsed(); 8931 8932 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8933 DiagnosticErrorTrap Trap(Diags); 8934 8935 // Return the address of the __invoke function. 8936 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 8937 CXXMethodDecl *Invoke 8938 = cast<CXXMethodDecl>(*Lambda->lookup(InvokeName).first); 8939 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 8940 VK_LValue, Conv->getLocation()).take(); 8941 assert(FunctionRef && "Can't refer to __invoke function?"); 8942 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 8943 Conv->setBody(new (Context) CompoundStmt(Context, &Return, 1, 8944 Conv->getLocation(), 8945 Conv->getLocation())); 8946 8947 // Fill in the __invoke function with a dummy implementation. IR generation 8948 // will fill in the actual details. 8949 Invoke->setUsed(); 8950 Invoke->setReferenced(); 8951 Invoke->setBody(new (Context) CompoundStmt(Conv->getLocation())); 8952 8953 if (ASTMutationListener *L = getASTMutationListener()) { 8954 L->CompletedImplicitDefinition(Conv); 8955 L->CompletedImplicitDefinition(Invoke); 8956 } 8957} 8958 8959void Sema::DefineImplicitLambdaToBlockPointerConversion( 8960 SourceLocation CurrentLocation, 8961 CXXConversionDecl *Conv) 8962{ 8963 Conv->setUsed(); 8964 8965 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8966 DiagnosticErrorTrap Trap(Diags); 8967 8968 // Copy-initialize the lambda object as needed to capture it. 8969 Expr *This = ActOnCXXThis(CurrentLocation).take(); 8970 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 8971 8972 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 8973 Conv->getLocation(), 8974 Conv, DerefThis); 8975 8976 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 8977 // behavior. Note that only the general conversion function does this 8978 // (since it's unusable otherwise); in the case where we inline the 8979 // block literal, it has block literal lifetime semantics. 8980 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 8981 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 8982 CK_CopyAndAutoreleaseBlockObject, 8983 BuildBlock.get(), 0, VK_RValue); 8984 8985 if (BuildBlock.isInvalid()) { 8986 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 8987 Conv->setInvalidDecl(); 8988 return; 8989 } 8990 8991 // Create the return statement that returns the block from the conversion 8992 // function. 8993 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 8994 if (Return.isInvalid()) { 8995 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 8996 Conv->setInvalidDecl(); 8997 return; 8998 } 8999 9000 // Set the body of the conversion function. 9001 Stmt *ReturnS = Return.take(); 9002 Conv->setBody(new (Context) CompoundStmt(Context, &ReturnS, 1, 9003 Conv->getLocation(), 9004 Conv->getLocation())); 9005 9006 // We're done; notify the mutation listener, if any. 9007 if (ASTMutationListener *L = getASTMutationListener()) { 9008 L->CompletedImplicitDefinition(Conv); 9009 } 9010} 9011 9012/// \brief Determine whether the given list arguments contains exactly one 9013/// "real" (non-default) argument. 9014static bool hasOneRealArgument(MultiExprArg Args) { 9015 switch (Args.size()) { 9016 case 0: 9017 return false; 9018 9019 default: 9020 if (!Args.get()[1]->isDefaultArgument()) 9021 return false; 9022 9023 // fall through 9024 case 1: 9025 return !Args.get()[0]->isDefaultArgument(); 9026 } 9027 9028 return false; 9029} 9030 9031ExprResult 9032Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9033 CXXConstructorDecl *Constructor, 9034 MultiExprArg ExprArgs, 9035 bool HadMultipleCandidates, 9036 bool RequiresZeroInit, 9037 unsigned ConstructKind, 9038 SourceRange ParenRange) { 9039 bool Elidable = false; 9040 9041 // C++0x [class.copy]p34: 9042 // When certain criteria are met, an implementation is allowed to 9043 // omit the copy/move construction of a class object, even if the 9044 // copy/move constructor and/or destructor for the object have 9045 // side effects. [...] 9046 // - when a temporary class object that has not been bound to a 9047 // reference (12.2) would be copied/moved to a class object 9048 // with the same cv-unqualified type, the copy/move operation 9049 // can be omitted by constructing the temporary object 9050 // directly into the target of the omitted copy/move 9051 if (ConstructKind == CXXConstructExpr::CK_Complete && 9052 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 9053 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 9054 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 9055 } 9056 9057 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 9058 Elidable, move(ExprArgs), HadMultipleCandidates, 9059 RequiresZeroInit, ConstructKind, ParenRange); 9060} 9061 9062/// BuildCXXConstructExpr - Creates a complete call to a constructor, 9063/// including handling of its default argument expressions. 9064ExprResult 9065Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9066 CXXConstructorDecl *Constructor, bool Elidable, 9067 MultiExprArg ExprArgs, 9068 bool HadMultipleCandidates, 9069 bool RequiresZeroInit, 9070 unsigned ConstructKind, 9071 SourceRange ParenRange) { 9072 unsigned NumExprs = ExprArgs.size(); 9073 Expr **Exprs = (Expr **)ExprArgs.release(); 9074 9075 MarkFunctionReferenced(ConstructLoc, Constructor); 9076 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 9077 Constructor, Elidable, Exprs, NumExprs, 9078 HadMultipleCandidates, /*FIXME*/false, 9079 RequiresZeroInit, 9080 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 9081 ParenRange)); 9082} 9083 9084bool Sema::InitializeVarWithConstructor(VarDecl *VD, 9085 CXXConstructorDecl *Constructor, 9086 MultiExprArg Exprs, 9087 bool HadMultipleCandidates) { 9088 // FIXME: Provide the correct paren SourceRange when available. 9089 ExprResult TempResult = 9090 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 9091 move(Exprs), HadMultipleCandidates, false, 9092 CXXConstructExpr::CK_Complete, SourceRange()); 9093 if (TempResult.isInvalid()) 9094 return true; 9095 9096 Expr *Temp = TempResult.takeAs<Expr>(); 9097 CheckImplicitConversions(Temp, VD->getLocation()); 9098 MarkFunctionReferenced(VD->getLocation(), Constructor); 9099 Temp = MaybeCreateExprWithCleanups(Temp); 9100 VD->setInit(Temp); 9101 9102 return false; 9103} 9104 9105void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9106 if (VD->isInvalidDecl()) return; 9107 9108 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9109 if (ClassDecl->isInvalidDecl()) return; 9110 if (ClassDecl->hasIrrelevantDestructor()) return; 9111 if (ClassDecl->isDependentContext()) return; 9112 9113 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9114 MarkFunctionReferenced(VD->getLocation(), Destructor); 9115 CheckDestructorAccess(VD->getLocation(), Destructor, 9116 PDiag(diag::err_access_dtor_var) 9117 << VD->getDeclName() 9118 << VD->getType()); 9119 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 9120 9121 if (!VD->hasGlobalStorage()) return; 9122 9123 // Emit warning for non-trivial dtor in global scope (a real global, 9124 // class-static, function-static). 9125 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9126 9127 // TODO: this should be re-enabled for static locals by !CXAAtExit 9128 if (!VD->isStaticLocal()) 9129 Diag(VD->getLocation(), diag::warn_global_destructor); 9130} 9131 9132/// \brief Given a constructor and the set of arguments provided for the 9133/// constructor, convert the arguments and add any required default arguments 9134/// to form a proper call to this constructor. 9135/// 9136/// \returns true if an error occurred, false otherwise. 9137bool 9138Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9139 MultiExprArg ArgsPtr, 9140 SourceLocation Loc, 9141 ASTOwningVector<Expr*> &ConvertedArgs, 9142 bool AllowExplicit) { 9143 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9144 unsigned NumArgs = ArgsPtr.size(); 9145 Expr **Args = (Expr **)ArgsPtr.get(); 9146 9147 const FunctionProtoType *Proto 9148 = Constructor->getType()->getAs<FunctionProtoType>(); 9149 assert(Proto && "Constructor without a prototype?"); 9150 unsigned NumArgsInProto = Proto->getNumArgs(); 9151 9152 // If too few arguments are available, we'll fill in the rest with defaults. 9153 if (NumArgs < NumArgsInProto) 9154 ConvertedArgs.reserve(NumArgsInProto); 9155 else 9156 ConvertedArgs.reserve(NumArgs); 9157 9158 VariadicCallType CallType = 9159 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9160 SmallVector<Expr *, 8> AllArgs; 9161 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9162 Proto, 0, Args, NumArgs, AllArgs, 9163 CallType, AllowExplicit); 9164 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 9165 9166 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size()); 9167 9168 CheckConstructorCall(Constructor, AllArgs.data(), AllArgs.size(), 9169 Proto, Loc); 9170 9171 return Invalid; 9172} 9173 9174static inline bool 9175CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9176 const FunctionDecl *FnDecl) { 9177 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9178 if (isa<NamespaceDecl>(DC)) { 9179 return SemaRef.Diag(FnDecl->getLocation(), 9180 diag::err_operator_new_delete_declared_in_namespace) 9181 << FnDecl->getDeclName(); 9182 } 9183 9184 if (isa<TranslationUnitDecl>(DC) && 9185 FnDecl->getStorageClass() == SC_Static) { 9186 return SemaRef.Diag(FnDecl->getLocation(), 9187 diag::err_operator_new_delete_declared_static) 9188 << FnDecl->getDeclName(); 9189 } 9190 9191 return false; 9192} 9193 9194static inline bool 9195CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9196 CanQualType ExpectedResultType, 9197 CanQualType ExpectedFirstParamType, 9198 unsigned DependentParamTypeDiag, 9199 unsigned InvalidParamTypeDiag) { 9200 QualType ResultType = 9201 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9202 9203 // Check that the result type is not dependent. 9204 if (ResultType->isDependentType()) 9205 return SemaRef.Diag(FnDecl->getLocation(), 9206 diag::err_operator_new_delete_dependent_result_type) 9207 << FnDecl->getDeclName() << ExpectedResultType; 9208 9209 // Check that the result type is what we expect. 9210 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9211 return SemaRef.Diag(FnDecl->getLocation(), 9212 diag::err_operator_new_delete_invalid_result_type) 9213 << FnDecl->getDeclName() << ExpectedResultType; 9214 9215 // A function template must have at least 2 parameters. 9216 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9217 return SemaRef.Diag(FnDecl->getLocation(), 9218 diag::err_operator_new_delete_template_too_few_parameters) 9219 << FnDecl->getDeclName(); 9220 9221 // The function decl must have at least 1 parameter. 9222 if (FnDecl->getNumParams() == 0) 9223 return SemaRef.Diag(FnDecl->getLocation(), 9224 diag::err_operator_new_delete_too_few_parameters) 9225 << FnDecl->getDeclName(); 9226 9227 // Check the first parameter type is not dependent. 9228 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9229 if (FirstParamType->isDependentType()) 9230 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9231 << FnDecl->getDeclName() << ExpectedFirstParamType; 9232 9233 // Check that the first parameter type is what we expect. 9234 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9235 ExpectedFirstParamType) 9236 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9237 << FnDecl->getDeclName() << ExpectedFirstParamType; 9238 9239 return false; 9240} 9241 9242static bool 9243CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9244 // C++ [basic.stc.dynamic.allocation]p1: 9245 // A program is ill-formed if an allocation function is declared in a 9246 // namespace scope other than global scope or declared static in global 9247 // scope. 9248 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9249 return true; 9250 9251 CanQualType SizeTy = 9252 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9253 9254 // C++ [basic.stc.dynamic.allocation]p1: 9255 // The return type shall be void*. The first parameter shall have type 9256 // std::size_t. 9257 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9258 SizeTy, 9259 diag::err_operator_new_dependent_param_type, 9260 diag::err_operator_new_param_type)) 9261 return true; 9262 9263 // C++ [basic.stc.dynamic.allocation]p1: 9264 // The first parameter shall not have an associated default argument. 9265 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9266 return SemaRef.Diag(FnDecl->getLocation(), 9267 diag::err_operator_new_default_arg) 9268 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9269 9270 return false; 9271} 9272 9273static bool 9274CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9275 // C++ [basic.stc.dynamic.deallocation]p1: 9276 // A program is ill-formed if deallocation functions are declared in a 9277 // namespace scope other than global scope or declared static in global 9278 // scope. 9279 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9280 return true; 9281 9282 // C++ [basic.stc.dynamic.deallocation]p2: 9283 // Each deallocation function shall return void and its first parameter 9284 // shall be void*. 9285 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9286 SemaRef.Context.VoidPtrTy, 9287 diag::err_operator_delete_dependent_param_type, 9288 diag::err_operator_delete_param_type)) 9289 return true; 9290 9291 return false; 9292} 9293 9294/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9295/// of this overloaded operator is well-formed. If so, returns false; 9296/// otherwise, emits appropriate diagnostics and returns true. 9297bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9298 assert(FnDecl && FnDecl->isOverloadedOperator() && 9299 "Expected an overloaded operator declaration"); 9300 9301 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9302 9303 // C++ [over.oper]p5: 9304 // The allocation and deallocation functions, operator new, 9305 // operator new[], operator delete and operator delete[], are 9306 // described completely in 3.7.3. The attributes and restrictions 9307 // found in the rest of this subclause do not apply to them unless 9308 // explicitly stated in 3.7.3. 9309 if (Op == OO_Delete || Op == OO_Array_Delete) 9310 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9311 9312 if (Op == OO_New || Op == OO_Array_New) 9313 return CheckOperatorNewDeclaration(*this, FnDecl); 9314 9315 // C++ [over.oper]p6: 9316 // An operator function shall either be a non-static member 9317 // function or be a non-member function and have at least one 9318 // parameter whose type is a class, a reference to a class, an 9319 // enumeration, or a reference to an enumeration. 9320 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9321 if (MethodDecl->isStatic()) 9322 return Diag(FnDecl->getLocation(), 9323 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9324 } else { 9325 bool ClassOrEnumParam = false; 9326 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9327 ParamEnd = FnDecl->param_end(); 9328 Param != ParamEnd; ++Param) { 9329 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9330 if (ParamType->isDependentType() || ParamType->isRecordType() || 9331 ParamType->isEnumeralType()) { 9332 ClassOrEnumParam = true; 9333 break; 9334 } 9335 } 9336 9337 if (!ClassOrEnumParam) 9338 return Diag(FnDecl->getLocation(), 9339 diag::err_operator_overload_needs_class_or_enum) 9340 << FnDecl->getDeclName(); 9341 } 9342 9343 // C++ [over.oper]p8: 9344 // An operator function cannot have default arguments (8.3.6), 9345 // except where explicitly stated below. 9346 // 9347 // Only the function-call operator allows default arguments 9348 // (C++ [over.call]p1). 9349 if (Op != OO_Call) { 9350 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9351 Param != FnDecl->param_end(); ++Param) { 9352 if ((*Param)->hasDefaultArg()) 9353 return Diag((*Param)->getLocation(), 9354 diag::err_operator_overload_default_arg) 9355 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9356 } 9357 } 9358 9359 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9360 { false, false, false } 9361#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9362 , { Unary, Binary, MemberOnly } 9363#include "clang/Basic/OperatorKinds.def" 9364 }; 9365 9366 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9367 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9368 bool MustBeMemberOperator = OperatorUses[Op][2]; 9369 9370 // C++ [over.oper]p8: 9371 // [...] Operator functions cannot have more or fewer parameters 9372 // than the number required for the corresponding operator, as 9373 // described in the rest of this subclause. 9374 unsigned NumParams = FnDecl->getNumParams() 9375 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9376 if (Op != OO_Call && 9377 ((NumParams == 1 && !CanBeUnaryOperator) || 9378 (NumParams == 2 && !CanBeBinaryOperator) || 9379 (NumParams < 1) || (NumParams > 2))) { 9380 // We have the wrong number of parameters. 9381 unsigned ErrorKind; 9382 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9383 ErrorKind = 2; // 2 -> unary or binary. 9384 } else if (CanBeUnaryOperator) { 9385 ErrorKind = 0; // 0 -> unary 9386 } else { 9387 assert(CanBeBinaryOperator && 9388 "All non-call overloaded operators are unary or binary!"); 9389 ErrorKind = 1; // 1 -> binary 9390 } 9391 9392 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9393 << FnDecl->getDeclName() << NumParams << ErrorKind; 9394 } 9395 9396 // Overloaded operators other than operator() cannot be variadic. 9397 if (Op != OO_Call && 9398 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9399 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9400 << FnDecl->getDeclName(); 9401 } 9402 9403 // Some operators must be non-static member functions. 9404 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9405 return Diag(FnDecl->getLocation(), 9406 diag::err_operator_overload_must_be_member) 9407 << FnDecl->getDeclName(); 9408 } 9409 9410 // C++ [over.inc]p1: 9411 // The user-defined function called operator++ implements the 9412 // prefix and postfix ++ operator. If this function is a member 9413 // function with no parameters, or a non-member function with one 9414 // parameter of class or enumeration type, it defines the prefix 9415 // increment operator ++ for objects of that type. If the function 9416 // is a member function with one parameter (which shall be of type 9417 // int) or a non-member function with two parameters (the second 9418 // of which shall be of type int), it defines the postfix 9419 // increment operator ++ for objects of that type. 9420 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9421 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9422 bool ParamIsInt = false; 9423 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9424 ParamIsInt = BT->getKind() == BuiltinType::Int; 9425 9426 if (!ParamIsInt) 9427 return Diag(LastParam->getLocation(), 9428 diag::err_operator_overload_post_incdec_must_be_int) 9429 << LastParam->getType() << (Op == OO_MinusMinus); 9430 } 9431 9432 return false; 9433} 9434 9435/// CheckLiteralOperatorDeclaration - Check whether the declaration 9436/// of this literal operator function is well-formed. If so, returns 9437/// false; otherwise, emits appropriate diagnostics and returns true. 9438bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9439 if (isa<CXXMethodDecl>(FnDecl)) { 9440 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9441 << FnDecl->getDeclName(); 9442 return true; 9443 } 9444 9445 if (FnDecl->isExternC()) { 9446 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 9447 return true; 9448 } 9449 9450 bool Valid = false; 9451 9452 // This might be the definition of a literal operator template. 9453 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 9454 // This might be a specialization of a literal operator template. 9455 if (!TpDecl) 9456 TpDecl = FnDecl->getPrimaryTemplate(); 9457 9458 // template <char...> type operator "" name() is the only valid template 9459 // signature, and the only valid signature with no parameters. 9460 if (TpDecl) { 9461 if (FnDecl->param_size() == 0) { 9462 // Must have only one template parameter 9463 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9464 if (Params->size() == 1) { 9465 NonTypeTemplateParmDecl *PmDecl = 9466 dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9467 9468 // The template parameter must be a char parameter pack. 9469 if (PmDecl && PmDecl->isTemplateParameterPack() && 9470 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9471 Valid = true; 9472 } 9473 } 9474 } else if (FnDecl->param_size()) { 9475 // Check the first parameter 9476 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9477 9478 QualType T = (*Param)->getType().getUnqualifiedType(); 9479 9480 // unsigned long long int, long double, and any character type are allowed 9481 // as the only parameters. 9482 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9483 Context.hasSameType(T, Context.LongDoubleTy) || 9484 Context.hasSameType(T, Context.CharTy) || 9485 Context.hasSameType(T, Context.WCharTy) || 9486 Context.hasSameType(T, Context.Char16Ty) || 9487 Context.hasSameType(T, Context.Char32Ty)) { 9488 if (++Param == FnDecl->param_end()) 9489 Valid = true; 9490 goto FinishedParams; 9491 } 9492 9493 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9494 const PointerType *PT = T->getAs<PointerType>(); 9495 if (!PT) 9496 goto FinishedParams; 9497 T = PT->getPointeeType(); 9498 if (!T.isConstQualified() || T.isVolatileQualified()) 9499 goto FinishedParams; 9500 T = T.getUnqualifiedType(); 9501 9502 // Move on to the second parameter; 9503 ++Param; 9504 9505 // If there is no second parameter, the first must be a const char * 9506 if (Param == FnDecl->param_end()) { 9507 if (Context.hasSameType(T, Context.CharTy)) 9508 Valid = true; 9509 goto FinishedParams; 9510 } 9511 9512 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9513 // are allowed as the first parameter to a two-parameter function 9514 if (!(Context.hasSameType(T, Context.CharTy) || 9515 Context.hasSameType(T, Context.WCharTy) || 9516 Context.hasSameType(T, Context.Char16Ty) || 9517 Context.hasSameType(T, Context.Char32Ty))) 9518 goto FinishedParams; 9519 9520 // The second and final parameter must be an std::size_t 9521 T = (*Param)->getType().getUnqualifiedType(); 9522 if (Context.hasSameType(T, Context.getSizeType()) && 9523 ++Param == FnDecl->param_end()) 9524 Valid = true; 9525 } 9526 9527 // FIXME: This diagnostic is absolutely terrible. 9528FinishedParams: 9529 if (!Valid) { 9530 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9531 << FnDecl->getDeclName(); 9532 return true; 9533 } 9534 9535 // A parameter-declaration-clause containing a default argument is not 9536 // equivalent to any of the permitted forms. 9537 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9538 ParamEnd = FnDecl->param_end(); 9539 Param != ParamEnd; ++Param) { 9540 if ((*Param)->hasDefaultArg()) { 9541 Diag((*Param)->getDefaultArgRange().getBegin(), 9542 diag::err_literal_operator_default_argument) 9543 << (*Param)->getDefaultArgRange(); 9544 break; 9545 } 9546 } 9547 9548 StringRef LiteralName 9549 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9550 if (LiteralName[0] != '_') { 9551 // C++11 [usrlit.suffix]p1: 9552 // Literal suffix identifiers that do not start with an underscore 9553 // are reserved for future standardization. 9554 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9555 } 9556 9557 return false; 9558} 9559 9560/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9561/// linkage specification, including the language and (if present) 9562/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9563/// the location of the language string literal, which is provided 9564/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9565/// the '{' brace. Otherwise, this linkage specification does not 9566/// have any braces. 9567Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9568 SourceLocation LangLoc, 9569 StringRef Lang, 9570 SourceLocation LBraceLoc) { 9571 LinkageSpecDecl::LanguageIDs Language; 9572 if (Lang == "\"C\"") 9573 Language = LinkageSpecDecl::lang_c; 9574 else if (Lang == "\"C++\"") 9575 Language = LinkageSpecDecl::lang_cxx; 9576 else { 9577 Diag(LangLoc, diag::err_bad_language); 9578 return 0; 9579 } 9580 9581 // FIXME: Add all the various semantics of linkage specifications 9582 9583 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9584 ExternLoc, LangLoc, Language); 9585 CurContext->addDecl(D); 9586 PushDeclContext(S, D); 9587 return D; 9588} 9589 9590/// ActOnFinishLinkageSpecification - Complete the definition of 9591/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9592/// valid, it's the position of the closing '}' brace in a linkage 9593/// specification that uses braces. 9594Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9595 Decl *LinkageSpec, 9596 SourceLocation RBraceLoc) { 9597 if (LinkageSpec) { 9598 if (RBraceLoc.isValid()) { 9599 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9600 LSDecl->setRBraceLoc(RBraceLoc); 9601 } 9602 PopDeclContext(); 9603 } 9604 return LinkageSpec; 9605} 9606 9607/// \brief Perform semantic analysis for the variable declaration that 9608/// occurs within a C++ catch clause, returning the newly-created 9609/// variable. 9610VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9611 TypeSourceInfo *TInfo, 9612 SourceLocation StartLoc, 9613 SourceLocation Loc, 9614 IdentifierInfo *Name) { 9615 bool Invalid = false; 9616 QualType ExDeclType = TInfo->getType(); 9617 9618 // Arrays and functions decay. 9619 if (ExDeclType->isArrayType()) 9620 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9621 else if (ExDeclType->isFunctionType()) 9622 ExDeclType = Context.getPointerType(ExDeclType); 9623 9624 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9625 // The exception-declaration shall not denote a pointer or reference to an 9626 // incomplete type, other than [cv] void*. 9627 // N2844 forbids rvalue references. 9628 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9629 Diag(Loc, diag::err_catch_rvalue_ref); 9630 Invalid = true; 9631 } 9632 9633 QualType BaseType = ExDeclType; 9634 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9635 unsigned DK = diag::err_catch_incomplete; 9636 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9637 BaseType = Ptr->getPointeeType(); 9638 Mode = 1; 9639 DK = diag::err_catch_incomplete_ptr; 9640 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9641 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9642 BaseType = Ref->getPointeeType(); 9643 Mode = 2; 9644 DK = diag::err_catch_incomplete_ref; 9645 } 9646 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9647 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 9648 Invalid = true; 9649 9650 if (!Invalid && !ExDeclType->isDependentType() && 9651 RequireNonAbstractType(Loc, ExDeclType, 9652 diag::err_abstract_type_in_decl, 9653 AbstractVariableType)) 9654 Invalid = true; 9655 9656 // Only the non-fragile NeXT runtime currently supports C++ catches 9657 // of ObjC types, and no runtime supports catching ObjC types by value. 9658 if (!Invalid && getLangOpts().ObjC1) { 9659 QualType T = ExDeclType; 9660 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9661 T = RT->getPointeeType(); 9662 9663 if (T->isObjCObjectType()) { 9664 Diag(Loc, diag::err_objc_object_catch); 9665 Invalid = true; 9666 } else if (T->isObjCObjectPointerType()) { 9667 // FIXME: should this be a test for macosx-fragile specifically? 9668 if (getLangOpts().ObjCRuntime.isFragile()) 9669 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9670 } 9671 } 9672 9673 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9674 ExDeclType, TInfo, SC_None, SC_None); 9675 ExDecl->setExceptionVariable(true); 9676 9677 // In ARC, infer 'retaining' for variables of retainable type. 9678 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9679 Invalid = true; 9680 9681 if (!Invalid && !ExDeclType->isDependentType()) { 9682 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9683 // C++ [except.handle]p16: 9684 // The object declared in an exception-declaration or, if the 9685 // exception-declaration does not specify a name, a temporary (12.2) is 9686 // copy-initialized (8.5) from the exception object. [...] 9687 // The object is destroyed when the handler exits, after the destruction 9688 // of any automatic objects initialized within the handler. 9689 // 9690 // We just pretend to initialize the object with itself, then make sure 9691 // it can be destroyed later. 9692 QualType initType = ExDeclType; 9693 9694 InitializedEntity entity = 9695 InitializedEntity::InitializeVariable(ExDecl); 9696 InitializationKind initKind = 9697 InitializationKind::CreateCopy(Loc, SourceLocation()); 9698 9699 Expr *opaqueValue = 9700 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9701 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9702 ExprResult result = sequence.Perform(*this, entity, initKind, 9703 MultiExprArg(&opaqueValue, 1)); 9704 if (result.isInvalid()) 9705 Invalid = true; 9706 else { 9707 // If the constructor used was non-trivial, set this as the 9708 // "initializer". 9709 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9710 if (!construct->getConstructor()->isTrivial()) { 9711 Expr *init = MaybeCreateExprWithCleanups(construct); 9712 ExDecl->setInit(init); 9713 } 9714 9715 // And make sure it's destructable. 9716 FinalizeVarWithDestructor(ExDecl, recordType); 9717 } 9718 } 9719 } 9720 9721 if (Invalid) 9722 ExDecl->setInvalidDecl(); 9723 9724 return ExDecl; 9725} 9726 9727/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9728/// handler. 9729Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9730 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9731 bool Invalid = D.isInvalidType(); 9732 9733 // Check for unexpanded parameter packs. 9734 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9735 UPPC_ExceptionType)) { 9736 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9737 D.getIdentifierLoc()); 9738 Invalid = true; 9739 } 9740 9741 IdentifierInfo *II = D.getIdentifier(); 9742 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9743 LookupOrdinaryName, 9744 ForRedeclaration)) { 9745 // The scope should be freshly made just for us. There is just no way 9746 // it contains any previous declaration. 9747 assert(!S->isDeclScope(PrevDecl)); 9748 if (PrevDecl->isTemplateParameter()) { 9749 // Maybe we will complain about the shadowed template parameter. 9750 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9751 PrevDecl = 0; 9752 } 9753 } 9754 9755 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9756 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9757 << D.getCXXScopeSpec().getRange(); 9758 Invalid = true; 9759 } 9760 9761 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9762 D.getLocStart(), 9763 D.getIdentifierLoc(), 9764 D.getIdentifier()); 9765 if (Invalid) 9766 ExDecl->setInvalidDecl(); 9767 9768 // Add the exception declaration into this scope. 9769 if (II) 9770 PushOnScopeChains(ExDecl, S); 9771 else 9772 CurContext->addDecl(ExDecl); 9773 9774 ProcessDeclAttributes(S, ExDecl, D); 9775 return ExDecl; 9776} 9777 9778Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9779 Expr *AssertExpr, 9780 Expr *AssertMessageExpr, 9781 SourceLocation RParenLoc) { 9782 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr); 9783 9784 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9785 return 0; 9786 9787 return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr, 9788 AssertMessage, RParenLoc, false); 9789} 9790 9791Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9792 Expr *AssertExpr, 9793 StringLiteral *AssertMessage, 9794 SourceLocation RParenLoc, 9795 bool Failed) { 9796 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() && 9797 !Failed) { 9798 // In a static_assert-declaration, the constant-expression shall be a 9799 // constant expression that can be contextually converted to bool. 9800 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 9801 if (Converted.isInvalid()) 9802 Failed = true; 9803 9804 llvm::APSInt Cond; 9805 if (!Failed && VerifyIntegerConstantExpression(Converted.get(), &Cond, 9806 diag::err_static_assert_expression_is_not_constant, 9807 /*AllowFold=*/false).isInvalid()) 9808 Failed = true; 9809 9810 if (!Failed && !Cond) { 9811 llvm::SmallString<256> MsgBuffer; 9812 llvm::raw_svector_ostream Msg(MsgBuffer); 9813 AssertMessage->printPretty(Msg, 0, getPrintingPolicy()); 9814 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9815 << Msg.str() << AssertExpr->getSourceRange(); 9816 Failed = true; 9817 } 9818 } 9819 9820 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9821 AssertExpr, AssertMessage, RParenLoc, 9822 Failed); 9823 9824 CurContext->addDecl(Decl); 9825 return Decl; 9826} 9827 9828/// \brief Perform semantic analysis of the given friend type declaration. 9829/// 9830/// \returns A friend declaration that. 9831FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc, 9832 SourceLocation FriendLoc, 9833 TypeSourceInfo *TSInfo) { 9834 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9835 9836 QualType T = TSInfo->getType(); 9837 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9838 9839 // C++03 [class.friend]p2: 9840 // An elaborated-type-specifier shall be used in a friend declaration 9841 // for a class.* 9842 // 9843 // * The class-key of the elaborated-type-specifier is required. 9844 if (!ActiveTemplateInstantiations.empty()) { 9845 // Do not complain about the form of friend template types during 9846 // template instantiation; we will already have complained when the 9847 // template was declared. 9848 } else if (!T->isElaboratedTypeSpecifier()) { 9849 // If we evaluated the type to a record type, suggest putting 9850 // a tag in front. 9851 if (const RecordType *RT = T->getAs<RecordType>()) { 9852 RecordDecl *RD = RT->getDecl(); 9853 9854 std::string InsertionText = std::string(" ") + RD->getKindName(); 9855 9856 Diag(TypeRange.getBegin(), 9857 getLangOpts().CPlusPlus0x ? 9858 diag::warn_cxx98_compat_unelaborated_friend_type : 9859 diag::ext_unelaborated_friend_type) 9860 << (unsigned) RD->getTagKind() 9861 << T 9862 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9863 InsertionText); 9864 } else { 9865 Diag(FriendLoc, 9866 getLangOpts().CPlusPlus0x ? 9867 diag::warn_cxx98_compat_nonclass_type_friend : 9868 diag::ext_nonclass_type_friend) 9869 << T 9870 << SourceRange(FriendLoc, TypeRange.getEnd()); 9871 } 9872 } else if (T->getAs<EnumType>()) { 9873 Diag(FriendLoc, 9874 getLangOpts().CPlusPlus0x ? 9875 diag::warn_cxx98_compat_enum_friend : 9876 diag::ext_enum_friend) 9877 << T 9878 << SourceRange(FriendLoc, TypeRange.getEnd()); 9879 } 9880 9881 // C++0x [class.friend]p3: 9882 // If the type specifier in a friend declaration designates a (possibly 9883 // cv-qualified) class type, that class is declared as a friend; otherwise, 9884 // the friend declaration is ignored. 9885 9886 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9887 // in [class.friend]p3 that we do not implement. 9888 9889 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc); 9890} 9891 9892/// Handle a friend tag declaration where the scope specifier was 9893/// templated. 9894Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9895 unsigned TagSpec, SourceLocation TagLoc, 9896 CXXScopeSpec &SS, 9897 IdentifierInfo *Name, SourceLocation NameLoc, 9898 AttributeList *Attr, 9899 MultiTemplateParamsArg TempParamLists) { 9900 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9901 9902 bool isExplicitSpecialization = false; 9903 bool Invalid = false; 9904 9905 if (TemplateParameterList *TemplateParams 9906 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9907 TempParamLists.get(), 9908 TempParamLists.size(), 9909 /*friend*/ true, 9910 isExplicitSpecialization, 9911 Invalid)) { 9912 if (TemplateParams->size() > 0) { 9913 // This is a declaration of a class template. 9914 if (Invalid) 9915 return 0; 9916 9917 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9918 SS, Name, NameLoc, Attr, 9919 TemplateParams, AS_public, 9920 /*ModulePrivateLoc=*/SourceLocation(), 9921 TempParamLists.size() - 1, 9922 (TemplateParameterList**) TempParamLists.release()).take(); 9923 } else { 9924 // The "template<>" header is extraneous. 9925 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9926 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9927 isExplicitSpecialization = true; 9928 } 9929 } 9930 9931 if (Invalid) return 0; 9932 9933 bool isAllExplicitSpecializations = true; 9934 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9935 if (TempParamLists.get()[I]->size()) { 9936 isAllExplicitSpecializations = false; 9937 break; 9938 } 9939 } 9940 9941 // FIXME: don't ignore attributes. 9942 9943 // If it's explicit specializations all the way down, just forget 9944 // about the template header and build an appropriate non-templated 9945 // friend. TODO: for source fidelity, remember the headers. 9946 if (isAllExplicitSpecializations) { 9947 if (SS.isEmpty()) { 9948 bool Owned = false; 9949 bool IsDependent = false; 9950 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 9951 Attr, AS_public, 9952 /*ModulePrivateLoc=*/SourceLocation(), 9953 MultiTemplateParamsArg(), Owned, IsDependent, 9954 /*ScopedEnumKWLoc=*/SourceLocation(), 9955 /*ScopedEnumUsesClassTag=*/false, 9956 /*UnderlyingType=*/TypeResult()); 9957 } 9958 9959 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9960 ElaboratedTypeKeyword Keyword 9961 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9962 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9963 *Name, NameLoc); 9964 if (T.isNull()) 9965 return 0; 9966 9967 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9968 if (isa<DependentNameType>(T)) { 9969 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9970 TL.setElaboratedKeywordLoc(TagLoc); 9971 TL.setQualifierLoc(QualifierLoc); 9972 TL.setNameLoc(NameLoc); 9973 } else { 9974 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9975 TL.setElaboratedKeywordLoc(TagLoc); 9976 TL.setQualifierLoc(QualifierLoc); 9977 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 9978 } 9979 9980 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9981 TSI, FriendLoc); 9982 Friend->setAccess(AS_public); 9983 CurContext->addDecl(Friend); 9984 return Friend; 9985 } 9986 9987 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9988 9989 9990 9991 // Handle the case of a templated-scope friend class. e.g. 9992 // template <class T> class A<T>::B; 9993 // FIXME: we don't support these right now. 9994 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9995 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 9996 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9997 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9998 TL.setElaboratedKeywordLoc(TagLoc); 9999 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 10000 TL.setNameLoc(NameLoc); 10001 10002 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10003 TSI, FriendLoc); 10004 Friend->setAccess(AS_public); 10005 Friend->setUnsupportedFriend(true); 10006 CurContext->addDecl(Friend); 10007 return Friend; 10008} 10009 10010 10011/// Handle a friend type declaration. This works in tandem with 10012/// ActOnTag. 10013/// 10014/// Notes on friend class templates: 10015/// 10016/// We generally treat friend class declarations as if they were 10017/// declaring a class. So, for example, the elaborated type specifier 10018/// in a friend declaration is required to obey the restrictions of a 10019/// class-head (i.e. no typedefs in the scope chain), template 10020/// parameters are required to match up with simple template-ids, &c. 10021/// However, unlike when declaring a template specialization, it's 10022/// okay to refer to a template specialization without an empty 10023/// template parameter declaration, e.g. 10024/// friend class A<T>::B<unsigned>; 10025/// We permit this as a special case; if there are any template 10026/// parameters present at all, require proper matching, i.e. 10027/// template <> template \<class T> friend class A<int>::B; 10028Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 10029 MultiTemplateParamsArg TempParams) { 10030 SourceLocation Loc = DS.getLocStart(); 10031 10032 assert(DS.isFriendSpecified()); 10033 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10034 10035 // Try to convert the decl specifier to a type. This works for 10036 // friend templates because ActOnTag never produces a ClassTemplateDecl 10037 // for a TUK_Friend. 10038 Declarator TheDeclarator(DS, Declarator::MemberContext); 10039 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 10040 QualType T = TSI->getType(); 10041 if (TheDeclarator.isInvalidType()) 10042 return 0; 10043 10044 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 10045 return 0; 10046 10047 // This is definitely an error in C++98. It's probably meant to 10048 // be forbidden in C++0x, too, but the specification is just 10049 // poorly written. 10050 // 10051 // The problem is with declarations like the following: 10052 // template <T> friend A<T>::foo; 10053 // where deciding whether a class C is a friend or not now hinges 10054 // on whether there exists an instantiation of A that causes 10055 // 'foo' to equal C. There are restrictions on class-heads 10056 // (which we declare (by fiat) elaborated friend declarations to 10057 // be) that makes this tractable. 10058 // 10059 // FIXME: handle "template <> friend class A<T>;", which 10060 // is possibly well-formed? Who even knows? 10061 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 10062 Diag(Loc, diag::err_tagless_friend_type_template) 10063 << DS.getSourceRange(); 10064 return 0; 10065 } 10066 10067 // C++98 [class.friend]p1: A friend of a class is a function 10068 // or class that is not a member of the class . . . 10069 // This is fixed in DR77, which just barely didn't make the C++03 10070 // deadline. It's also a very silly restriction that seriously 10071 // affects inner classes and which nobody else seems to implement; 10072 // thus we never diagnose it, not even in -pedantic. 10073 // 10074 // But note that we could warn about it: it's always useless to 10075 // friend one of your own members (it's not, however, worthless to 10076 // friend a member of an arbitrary specialization of your template). 10077 10078 Decl *D; 10079 if (unsigned NumTempParamLists = TempParams.size()) 10080 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10081 NumTempParamLists, 10082 TempParams.release(), 10083 TSI, 10084 DS.getFriendSpecLoc()); 10085 else 10086 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 10087 10088 if (!D) 10089 return 0; 10090 10091 D->setAccess(AS_public); 10092 CurContext->addDecl(D); 10093 10094 return D; 10095} 10096 10097Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 10098 MultiTemplateParamsArg TemplateParams) { 10099 const DeclSpec &DS = D.getDeclSpec(); 10100 10101 assert(DS.isFriendSpecified()); 10102 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10103 10104 SourceLocation Loc = D.getIdentifierLoc(); 10105 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10106 10107 // C++ [class.friend]p1 10108 // A friend of a class is a function or class.... 10109 // Note that this sees through typedefs, which is intended. 10110 // It *doesn't* see through dependent types, which is correct 10111 // according to [temp.arg.type]p3: 10112 // If a declaration acquires a function type through a 10113 // type dependent on a template-parameter and this causes 10114 // a declaration that does not use the syntactic form of a 10115 // function declarator to have a function type, the program 10116 // is ill-formed. 10117 if (!TInfo->getType()->isFunctionType()) { 10118 Diag(Loc, diag::err_unexpected_friend); 10119 10120 // It might be worthwhile to try to recover by creating an 10121 // appropriate declaration. 10122 return 0; 10123 } 10124 10125 // C++ [namespace.memdef]p3 10126 // - If a friend declaration in a non-local class first declares a 10127 // class or function, the friend class or function is a member 10128 // of the innermost enclosing namespace. 10129 // - The name of the friend is not found by simple name lookup 10130 // until a matching declaration is provided in that namespace 10131 // scope (either before or after the class declaration granting 10132 // friendship). 10133 // - If a friend function is called, its name may be found by the 10134 // name lookup that considers functions from namespaces and 10135 // classes associated with the types of the function arguments. 10136 // - When looking for a prior declaration of a class or a function 10137 // declared as a friend, scopes outside the innermost enclosing 10138 // namespace scope are not considered. 10139 10140 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10141 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10142 DeclarationName Name = NameInfo.getName(); 10143 assert(Name); 10144 10145 // Check for unexpanded parameter packs. 10146 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10147 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10148 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10149 return 0; 10150 10151 // The context we found the declaration in, or in which we should 10152 // create the declaration. 10153 DeclContext *DC; 10154 Scope *DCScope = S; 10155 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10156 ForRedeclaration); 10157 10158 // FIXME: there are different rules in local classes 10159 10160 // There are four cases here. 10161 // - There's no scope specifier, in which case we just go to the 10162 // appropriate scope and look for a function or function template 10163 // there as appropriate. 10164 // Recover from invalid scope qualifiers as if they just weren't there. 10165 if (SS.isInvalid() || !SS.isSet()) { 10166 // C++0x [namespace.memdef]p3: 10167 // If the name in a friend declaration is neither qualified nor 10168 // a template-id and the declaration is a function or an 10169 // elaborated-type-specifier, the lookup to determine whether 10170 // the entity has been previously declared shall not consider 10171 // any scopes outside the innermost enclosing namespace. 10172 // C++0x [class.friend]p11: 10173 // If a friend declaration appears in a local class and the name 10174 // specified is an unqualified name, a prior declaration is 10175 // looked up without considering scopes that are outside the 10176 // innermost enclosing non-class scope. For a friend function 10177 // declaration, if there is no prior declaration, the program is 10178 // ill-formed. 10179 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10180 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10181 10182 // Find the appropriate context according to the above. 10183 DC = CurContext; 10184 while (true) { 10185 // Skip class contexts. If someone can cite chapter and verse 10186 // for this behavior, that would be nice --- it's what GCC and 10187 // EDG do, and it seems like a reasonable intent, but the spec 10188 // really only says that checks for unqualified existing 10189 // declarations should stop at the nearest enclosing namespace, 10190 // not that they should only consider the nearest enclosing 10191 // namespace. 10192 while (DC->isRecord() || DC->isTransparentContext()) 10193 DC = DC->getParent(); 10194 10195 LookupQualifiedName(Previous, DC); 10196 10197 // TODO: decide what we think about using declarations. 10198 if (isLocal || !Previous.empty()) 10199 break; 10200 10201 if (isTemplateId) { 10202 if (isa<TranslationUnitDecl>(DC)) break; 10203 } else { 10204 if (DC->isFileContext()) break; 10205 } 10206 DC = DC->getParent(); 10207 } 10208 10209 // C++ [class.friend]p1: A friend of a class is a function or 10210 // class that is not a member of the class . . . 10211 // C++11 changes this for both friend types and functions. 10212 // Most C++ 98 compilers do seem to give an error here, so 10213 // we do, too. 10214 if (!Previous.empty() && DC->Equals(CurContext)) 10215 Diag(DS.getFriendSpecLoc(), 10216 getLangOpts().CPlusPlus0x ? 10217 diag::warn_cxx98_compat_friend_is_member : 10218 diag::err_friend_is_member); 10219 10220 DCScope = getScopeForDeclContext(S, DC); 10221 10222 // C++ [class.friend]p6: 10223 // A function can be defined in a friend declaration of a class if and 10224 // only if the class is a non-local class (9.8), the function name is 10225 // unqualified, and the function has namespace scope. 10226 if (isLocal && D.isFunctionDefinition()) { 10227 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10228 } 10229 10230 // - There's a non-dependent scope specifier, in which case we 10231 // compute it and do a previous lookup there for a function 10232 // or function template. 10233 } else if (!SS.getScopeRep()->isDependent()) { 10234 DC = computeDeclContext(SS); 10235 if (!DC) return 0; 10236 10237 if (RequireCompleteDeclContext(SS, DC)) return 0; 10238 10239 LookupQualifiedName(Previous, DC); 10240 10241 // Ignore things found implicitly in the wrong scope. 10242 // TODO: better diagnostics for this case. Suggesting the right 10243 // qualified scope would be nice... 10244 LookupResult::Filter F = Previous.makeFilter(); 10245 while (F.hasNext()) { 10246 NamedDecl *D = F.next(); 10247 if (!DC->InEnclosingNamespaceSetOf( 10248 D->getDeclContext()->getRedeclContext())) 10249 F.erase(); 10250 } 10251 F.done(); 10252 10253 if (Previous.empty()) { 10254 D.setInvalidType(); 10255 Diag(Loc, diag::err_qualified_friend_not_found) 10256 << Name << TInfo->getType(); 10257 return 0; 10258 } 10259 10260 // C++ [class.friend]p1: A friend of a class is a function or 10261 // class that is not a member of the class . . . 10262 if (DC->Equals(CurContext)) 10263 Diag(DS.getFriendSpecLoc(), 10264 getLangOpts().CPlusPlus0x ? 10265 diag::warn_cxx98_compat_friend_is_member : 10266 diag::err_friend_is_member); 10267 10268 if (D.isFunctionDefinition()) { 10269 // C++ [class.friend]p6: 10270 // A function can be defined in a friend declaration of a class if and 10271 // only if the class is a non-local class (9.8), the function name is 10272 // unqualified, and the function has namespace scope. 10273 SemaDiagnosticBuilder DB 10274 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10275 10276 DB << SS.getScopeRep(); 10277 if (DC->isFileContext()) 10278 DB << FixItHint::CreateRemoval(SS.getRange()); 10279 SS.clear(); 10280 } 10281 10282 // - There's a scope specifier that does not match any template 10283 // parameter lists, in which case we use some arbitrary context, 10284 // create a method or method template, and wait for instantiation. 10285 // - There's a scope specifier that does match some template 10286 // parameter lists, which we don't handle right now. 10287 } else { 10288 if (D.isFunctionDefinition()) { 10289 // C++ [class.friend]p6: 10290 // A function can be defined in a friend declaration of a class if and 10291 // only if the class is a non-local class (9.8), the function name is 10292 // unqualified, and the function has namespace scope. 10293 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10294 << SS.getScopeRep(); 10295 } 10296 10297 DC = CurContext; 10298 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10299 } 10300 10301 if (!DC->isRecord()) { 10302 // This implies that it has to be an operator or function. 10303 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10304 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10305 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10306 Diag(Loc, diag::err_introducing_special_friend) << 10307 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10308 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10309 return 0; 10310 } 10311 } 10312 10313 // FIXME: This is an egregious hack to cope with cases where the scope stack 10314 // does not contain the declaration context, i.e., in an out-of-line 10315 // definition of a class. 10316 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10317 if (!DCScope) { 10318 FakeDCScope.setEntity(DC); 10319 DCScope = &FakeDCScope; 10320 } 10321 10322 bool AddToScope = true; 10323 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10324 move(TemplateParams), AddToScope); 10325 if (!ND) return 0; 10326 10327 assert(ND->getDeclContext() == DC); 10328 assert(ND->getLexicalDeclContext() == CurContext); 10329 10330 // Add the function declaration to the appropriate lookup tables, 10331 // adjusting the redeclarations list as necessary. We don't 10332 // want to do this yet if the friending class is dependent. 10333 // 10334 // Also update the scope-based lookup if the target context's 10335 // lookup context is in lexical scope. 10336 if (!CurContext->isDependentContext()) { 10337 DC = DC->getRedeclContext(); 10338 DC->makeDeclVisibleInContext(ND); 10339 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10340 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10341 } 10342 10343 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10344 D.getIdentifierLoc(), ND, 10345 DS.getFriendSpecLoc()); 10346 FrD->setAccess(AS_public); 10347 CurContext->addDecl(FrD); 10348 10349 if (ND->isInvalidDecl()) { 10350 FrD->setInvalidDecl(); 10351 } else { 10352 if (DC->isRecord()) CheckFriendAccess(ND); 10353 10354 FunctionDecl *FD; 10355 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10356 FD = FTD->getTemplatedDecl(); 10357 else 10358 FD = cast<FunctionDecl>(ND); 10359 10360 // Mark templated-scope function declarations as unsupported. 10361 if (FD->getNumTemplateParameterLists()) 10362 FrD->setUnsupportedFriend(true); 10363 } 10364 10365 return ND; 10366} 10367 10368void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10369 AdjustDeclIfTemplate(Dcl); 10370 10371 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10372 if (!Fn) { 10373 Diag(DelLoc, diag::err_deleted_non_function); 10374 return; 10375 } 10376 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10377 // Don't consider the implicit declaration we generate for explicit 10378 // specializations. FIXME: Do not generate these implicit declarations. 10379 if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization 10380 || Prev->getPreviousDecl()) && !Prev->isDefined()) { 10381 Diag(DelLoc, diag::err_deleted_decl_not_first); 10382 Diag(Prev->getLocation(), diag::note_previous_declaration); 10383 } 10384 // If the declaration wasn't the first, we delete the function anyway for 10385 // recovery. 10386 } 10387 Fn->setDeletedAsWritten(); 10388 10389 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10390 if (!MD) 10391 return; 10392 10393 // A deleted special member function is trivial if the corresponding 10394 // implicitly-declared function would have been. 10395 switch (getSpecialMember(MD)) { 10396 case CXXInvalid: 10397 break; 10398 case CXXDefaultConstructor: 10399 MD->setTrivial(MD->getParent()->hasTrivialDefaultConstructor()); 10400 break; 10401 case CXXCopyConstructor: 10402 MD->setTrivial(MD->getParent()->hasTrivialCopyConstructor()); 10403 break; 10404 case CXXMoveConstructor: 10405 MD->setTrivial(MD->getParent()->hasTrivialMoveConstructor()); 10406 break; 10407 case CXXCopyAssignment: 10408 MD->setTrivial(MD->getParent()->hasTrivialCopyAssignment()); 10409 break; 10410 case CXXMoveAssignment: 10411 MD->setTrivial(MD->getParent()->hasTrivialMoveAssignment()); 10412 break; 10413 case CXXDestructor: 10414 MD->setTrivial(MD->getParent()->hasTrivialDestructor()); 10415 break; 10416 } 10417} 10418 10419void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10420 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10421 10422 if (MD) { 10423 if (MD->getParent()->isDependentType()) { 10424 MD->setDefaulted(); 10425 MD->setExplicitlyDefaulted(); 10426 return; 10427 } 10428 10429 CXXSpecialMember Member = getSpecialMember(MD); 10430 if (Member == CXXInvalid) { 10431 Diag(DefaultLoc, diag::err_default_special_members); 10432 return; 10433 } 10434 10435 MD->setDefaulted(); 10436 MD->setExplicitlyDefaulted(); 10437 10438 // If this definition appears within the record, do the checking when 10439 // the record is complete. 10440 const FunctionDecl *Primary = MD; 10441 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10442 // Find the uninstantiated declaration that actually had the '= default' 10443 // on it. 10444 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10445 10446 if (Primary == Primary->getCanonicalDecl()) 10447 return; 10448 10449 CheckExplicitlyDefaultedSpecialMember(MD); 10450 10451 switch (Member) { 10452 case CXXDefaultConstructor: { 10453 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10454 if (!CD->isInvalidDecl()) 10455 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10456 break; 10457 } 10458 10459 case CXXCopyConstructor: { 10460 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10461 if (!CD->isInvalidDecl()) 10462 DefineImplicitCopyConstructor(DefaultLoc, CD); 10463 break; 10464 } 10465 10466 case CXXCopyAssignment: { 10467 if (!MD->isInvalidDecl()) 10468 DefineImplicitCopyAssignment(DefaultLoc, MD); 10469 break; 10470 } 10471 10472 case CXXDestructor: { 10473 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10474 if (!DD->isInvalidDecl()) 10475 DefineImplicitDestructor(DefaultLoc, DD); 10476 break; 10477 } 10478 10479 case CXXMoveConstructor: { 10480 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10481 if (!CD->isInvalidDecl()) 10482 DefineImplicitMoveConstructor(DefaultLoc, CD); 10483 break; 10484 } 10485 10486 case CXXMoveAssignment: { 10487 if (!MD->isInvalidDecl()) 10488 DefineImplicitMoveAssignment(DefaultLoc, MD); 10489 break; 10490 } 10491 10492 case CXXInvalid: 10493 llvm_unreachable("Invalid special member."); 10494 } 10495 } else { 10496 Diag(DefaultLoc, diag::err_default_special_members); 10497 } 10498} 10499 10500static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10501 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10502 Stmt *SubStmt = *CI; 10503 if (!SubStmt) 10504 continue; 10505 if (isa<ReturnStmt>(SubStmt)) 10506 Self.Diag(SubStmt->getLocStart(), 10507 diag::err_return_in_constructor_handler); 10508 if (!isa<Expr>(SubStmt)) 10509 SearchForReturnInStmt(Self, SubStmt); 10510 } 10511} 10512 10513void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10514 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10515 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10516 SearchForReturnInStmt(*this, Handler); 10517 } 10518} 10519 10520bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10521 const CXXMethodDecl *Old) { 10522 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10523 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10524 10525 if (Context.hasSameType(NewTy, OldTy) || 10526 NewTy->isDependentType() || OldTy->isDependentType()) 10527 return false; 10528 10529 // Check if the return types are covariant 10530 QualType NewClassTy, OldClassTy; 10531 10532 /// Both types must be pointers or references to classes. 10533 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10534 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10535 NewClassTy = NewPT->getPointeeType(); 10536 OldClassTy = OldPT->getPointeeType(); 10537 } 10538 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10539 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10540 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10541 NewClassTy = NewRT->getPointeeType(); 10542 OldClassTy = OldRT->getPointeeType(); 10543 } 10544 } 10545 } 10546 10547 // The return types aren't either both pointers or references to a class type. 10548 if (NewClassTy.isNull()) { 10549 Diag(New->getLocation(), 10550 diag::err_different_return_type_for_overriding_virtual_function) 10551 << New->getDeclName() << NewTy << OldTy; 10552 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10553 10554 return true; 10555 } 10556 10557 // C++ [class.virtual]p6: 10558 // If the return type of D::f differs from the return type of B::f, the 10559 // class type in the return type of D::f shall be complete at the point of 10560 // declaration of D::f or shall be the class type D. 10561 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10562 if (!RT->isBeingDefined() && 10563 RequireCompleteType(New->getLocation(), NewClassTy, 10564 diag::err_covariant_return_incomplete, 10565 New->getDeclName())) 10566 return true; 10567 } 10568 10569 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10570 // Check if the new class derives from the old class. 10571 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10572 Diag(New->getLocation(), 10573 diag::err_covariant_return_not_derived) 10574 << New->getDeclName() << NewTy << OldTy; 10575 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10576 return true; 10577 } 10578 10579 // Check if we the conversion from derived to base is valid. 10580 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10581 diag::err_covariant_return_inaccessible_base, 10582 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10583 // FIXME: Should this point to the return type? 10584 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10585 // FIXME: this note won't trigger for delayed access control 10586 // diagnostics, and it's impossible to get an undelayed error 10587 // here from access control during the original parse because 10588 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10589 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10590 return true; 10591 } 10592 } 10593 10594 // The qualifiers of the return types must be the same. 10595 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10596 Diag(New->getLocation(), 10597 diag::err_covariant_return_type_different_qualifications) 10598 << New->getDeclName() << NewTy << OldTy; 10599 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10600 return true; 10601 }; 10602 10603 10604 // The new class type must have the same or less qualifiers as the old type. 10605 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10606 Diag(New->getLocation(), 10607 diag::err_covariant_return_type_class_type_more_qualified) 10608 << New->getDeclName() << NewTy << OldTy; 10609 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10610 return true; 10611 }; 10612 10613 return false; 10614} 10615 10616/// \brief Mark the given method pure. 10617/// 10618/// \param Method the method to be marked pure. 10619/// 10620/// \param InitRange the source range that covers the "0" initializer. 10621bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10622 SourceLocation EndLoc = InitRange.getEnd(); 10623 if (EndLoc.isValid()) 10624 Method->setRangeEnd(EndLoc); 10625 10626 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10627 Method->setPure(); 10628 return false; 10629 } 10630 10631 if (!Method->isInvalidDecl()) 10632 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10633 << Method->getDeclName() << InitRange; 10634 return true; 10635} 10636 10637/// \brief Determine whether the given declaration is a static data member. 10638static bool isStaticDataMember(Decl *D) { 10639 VarDecl *Var = dyn_cast_or_null<VarDecl>(D); 10640 if (!Var) 10641 return false; 10642 10643 return Var->isStaticDataMember(); 10644} 10645/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10646/// an initializer for the out-of-line declaration 'Dcl'. The scope 10647/// is a fresh scope pushed for just this purpose. 10648/// 10649/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10650/// static data member of class X, names should be looked up in the scope of 10651/// class X. 10652void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10653 // If there is no declaration, there was an error parsing it. 10654 if (D == 0 || D->isInvalidDecl()) return; 10655 10656 // We should only get called for declarations with scope specifiers, like: 10657 // int foo::bar; 10658 assert(D->isOutOfLine()); 10659 EnterDeclaratorContext(S, D->getDeclContext()); 10660 10661 // If we are parsing the initializer for a static data member, push a 10662 // new expression evaluation context that is associated with this static 10663 // data member. 10664 if (isStaticDataMember(D)) 10665 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 10666} 10667 10668/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10669/// initializer for the out-of-line declaration 'D'. 10670void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10671 // If there is no declaration, there was an error parsing it. 10672 if (D == 0 || D->isInvalidDecl()) return; 10673 10674 if (isStaticDataMember(D)) 10675 PopExpressionEvaluationContext(); 10676 10677 assert(D->isOutOfLine()); 10678 ExitDeclaratorContext(S); 10679} 10680 10681/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10682/// C++ if/switch/while/for statement. 10683/// e.g: "if (int x = f()) {...}" 10684DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10685 // C++ 6.4p2: 10686 // The declarator shall not specify a function or an array. 10687 // The type-specifier-seq shall not contain typedef and shall not declare a 10688 // new class or enumeration. 10689 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10690 "Parser allowed 'typedef' as storage class of condition decl."); 10691 10692 Decl *Dcl = ActOnDeclarator(S, D); 10693 if (!Dcl) 10694 return true; 10695 10696 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10697 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10698 << D.getSourceRange(); 10699 return true; 10700 } 10701 10702 return Dcl; 10703} 10704 10705void Sema::LoadExternalVTableUses() { 10706 if (!ExternalSource) 10707 return; 10708 10709 SmallVector<ExternalVTableUse, 4> VTables; 10710 ExternalSource->ReadUsedVTables(VTables); 10711 SmallVector<VTableUse, 4> NewUses; 10712 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10713 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10714 = VTablesUsed.find(VTables[I].Record); 10715 // Even if a definition wasn't required before, it may be required now. 10716 if (Pos != VTablesUsed.end()) { 10717 if (!Pos->second && VTables[I].DefinitionRequired) 10718 Pos->second = true; 10719 continue; 10720 } 10721 10722 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10723 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10724 } 10725 10726 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10727} 10728 10729void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10730 bool DefinitionRequired) { 10731 // Ignore any vtable uses in unevaluated operands or for classes that do 10732 // not have a vtable. 10733 if (!Class->isDynamicClass() || Class->isDependentContext() || 10734 CurContext->isDependentContext() || 10735 ExprEvalContexts.back().Context == Unevaluated) 10736 return; 10737 10738 // Try to insert this class into the map. 10739 LoadExternalVTableUses(); 10740 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10741 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10742 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10743 if (!Pos.second) { 10744 // If we already had an entry, check to see if we are promoting this vtable 10745 // to required a definition. If so, we need to reappend to the VTableUses 10746 // list, since we may have already processed the first entry. 10747 if (DefinitionRequired && !Pos.first->second) { 10748 Pos.first->second = true; 10749 } else { 10750 // Otherwise, we can early exit. 10751 return; 10752 } 10753 } 10754 10755 // Local classes need to have their virtual members marked 10756 // immediately. For all other classes, we mark their virtual members 10757 // at the end of the translation unit. 10758 if (Class->isLocalClass()) 10759 MarkVirtualMembersReferenced(Loc, Class); 10760 else 10761 VTableUses.push_back(std::make_pair(Class, Loc)); 10762} 10763 10764bool Sema::DefineUsedVTables() { 10765 LoadExternalVTableUses(); 10766 if (VTableUses.empty()) 10767 return false; 10768 10769 // Note: The VTableUses vector could grow as a result of marking 10770 // the members of a class as "used", so we check the size each 10771 // time through the loop and prefer indices (which are stable) to 10772 // iterators (which are not). 10773 bool DefinedAnything = false; 10774 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10775 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10776 if (!Class) 10777 continue; 10778 10779 SourceLocation Loc = VTableUses[I].second; 10780 10781 bool DefineVTable = true; 10782 10783 // If this class has a key function, but that key function is 10784 // defined in another translation unit, we don't need to emit the 10785 // vtable even though we're using it. 10786 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10787 if (KeyFunction && !KeyFunction->hasBody()) { 10788 switch (KeyFunction->getTemplateSpecializationKind()) { 10789 case TSK_Undeclared: 10790 case TSK_ExplicitSpecialization: 10791 case TSK_ExplicitInstantiationDeclaration: 10792 // The key function is in another translation unit. 10793 DefineVTable = false; 10794 break; 10795 10796 case TSK_ExplicitInstantiationDefinition: 10797 case TSK_ImplicitInstantiation: 10798 // We will be instantiating the key function. 10799 break; 10800 } 10801 } else if (!KeyFunction) { 10802 // If we have a class with no key function that is the subject 10803 // of an explicit instantiation declaration, suppress the 10804 // vtable; it will live with the explicit instantiation 10805 // definition. 10806 bool IsExplicitInstantiationDeclaration 10807 = Class->getTemplateSpecializationKind() 10808 == TSK_ExplicitInstantiationDeclaration; 10809 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10810 REnd = Class->redecls_end(); 10811 R != REnd; ++R) { 10812 TemplateSpecializationKind TSK 10813 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10814 if (TSK == TSK_ExplicitInstantiationDeclaration) 10815 IsExplicitInstantiationDeclaration = true; 10816 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10817 IsExplicitInstantiationDeclaration = false; 10818 break; 10819 } 10820 } 10821 10822 if (IsExplicitInstantiationDeclaration) 10823 DefineVTable = false; 10824 } 10825 10826 // The exception specifications for all virtual members may be needed even 10827 // if we are not providing an authoritative form of the vtable in this TU. 10828 // We may choose to emit it available_externally anyway. 10829 if (!DefineVTable) { 10830 MarkVirtualMemberExceptionSpecsNeeded(Loc, Class); 10831 continue; 10832 } 10833 10834 // Mark all of the virtual members of this class as referenced, so 10835 // that we can build a vtable. Then, tell the AST consumer that a 10836 // vtable for this class is required. 10837 DefinedAnything = true; 10838 MarkVirtualMembersReferenced(Loc, Class); 10839 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10840 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10841 10842 // Optionally warn if we're emitting a weak vtable. 10843 if (Class->getLinkage() == ExternalLinkage && 10844 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10845 const FunctionDecl *KeyFunctionDef = 0; 10846 if (!KeyFunction || 10847 (KeyFunction->hasBody(KeyFunctionDef) && 10848 KeyFunctionDef->isInlined())) 10849 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10850 TSK_ExplicitInstantiationDefinition 10851 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10852 << Class; 10853 } 10854 } 10855 VTableUses.clear(); 10856 10857 return DefinedAnything; 10858} 10859 10860void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc, 10861 const CXXRecordDecl *RD) { 10862 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 10863 E = RD->method_end(); I != E; ++I) 10864 if ((*I)->isVirtual() && !(*I)->isPure()) 10865 ResolveExceptionSpec(Loc, (*I)->getType()->castAs<FunctionProtoType>()); 10866} 10867 10868void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10869 const CXXRecordDecl *RD) { 10870 // Mark all functions which will appear in RD's vtable as used. 10871 CXXFinalOverriderMap FinalOverriders; 10872 RD->getFinalOverriders(FinalOverriders); 10873 for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(), 10874 E = FinalOverriders.end(); 10875 I != E; ++I) { 10876 for (OverridingMethods::const_iterator OI = I->second.begin(), 10877 OE = I->second.end(); 10878 OI != OE; ++OI) { 10879 assert(OI->second.size() > 0 && "no final overrider"); 10880 CXXMethodDecl *Overrider = OI->second.front().Method; 10881 10882 // C++ [basic.def.odr]p2: 10883 // [...] A virtual member function is used if it is not pure. [...] 10884 if (!Overrider->isPure()) 10885 MarkFunctionReferenced(Loc, Overrider); 10886 } 10887 } 10888 10889 // Only classes that have virtual bases need a VTT. 10890 if (RD->getNumVBases() == 0) 10891 return; 10892 10893 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10894 e = RD->bases_end(); i != e; ++i) { 10895 const CXXRecordDecl *Base = 10896 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10897 if (Base->getNumVBases() == 0) 10898 continue; 10899 MarkVirtualMembersReferenced(Loc, Base); 10900 } 10901} 10902 10903/// SetIvarInitializers - This routine builds initialization ASTs for the 10904/// Objective-C implementation whose ivars need be initialized. 10905void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10906 if (!getLangOpts().CPlusPlus) 10907 return; 10908 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10909 SmallVector<ObjCIvarDecl*, 8> ivars; 10910 CollectIvarsToConstructOrDestruct(OID, ivars); 10911 if (ivars.empty()) 10912 return; 10913 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10914 for (unsigned i = 0; i < ivars.size(); i++) { 10915 FieldDecl *Field = ivars[i]; 10916 if (Field->isInvalidDecl()) 10917 continue; 10918 10919 CXXCtorInitializer *Member; 10920 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10921 InitializationKind InitKind = 10922 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10923 10924 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10925 ExprResult MemberInit = 10926 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10927 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10928 // Note, MemberInit could actually come back empty if no initialization 10929 // is required (e.g., because it would call a trivial default constructor) 10930 if (!MemberInit.get() || MemberInit.isInvalid()) 10931 continue; 10932 10933 Member = 10934 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10935 SourceLocation(), 10936 MemberInit.takeAs<Expr>(), 10937 SourceLocation()); 10938 AllToInit.push_back(Member); 10939 10940 // Be sure that the destructor is accessible and is marked as referenced. 10941 if (const RecordType *RecordTy 10942 = Context.getBaseElementType(Field->getType()) 10943 ->getAs<RecordType>()) { 10944 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10945 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10946 MarkFunctionReferenced(Field->getLocation(), Destructor); 10947 CheckDestructorAccess(Field->getLocation(), Destructor, 10948 PDiag(diag::err_access_dtor_ivar) 10949 << Context.getBaseElementType(Field->getType())); 10950 } 10951 } 10952 } 10953 ObjCImplementation->setIvarInitializers(Context, 10954 AllToInit.data(), AllToInit.size()); 10955 } 10956} 10957 10958static 10959void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10960 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10961 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10962 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10963 Sema &S) { 10964 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10965 CE = Current.end(); 10966 if (Ctor->isInvalidDecl()) 10967 return; 10968 10969 const FunctionDecl *FNTarget = 0; 10970 CXXConstructorDecl *Target; 10971 10972 // We ignore the result here since if we don't have a body, Target will be 10973 // null below. 10974 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10975 Target 10976= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10977 10978 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10979 // Avoid dereferencing a null pointer here. 10980 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10981 10982 if (!Current.insert(Canonical)) 10983 return; 10984 10985 // We know that beyond here, we aren't chaining into a cycle. 10986 if (!Target || !Target->isDelegatingConstructor() || 10987 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10988 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10989 Valid.insert(*CI); 10990 Current.clear(); 10991 // We've hit a cycle. 10992 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 10993 Current.count(TCanonical)) { 10994 // If we haven't diagnosed this cycle yet, do so now. 10995 if (!Invalid.count(TCanonical)) { 10996 S.Diag((*Ctor->init_begin())->getSourceLocation(), 10997 diag::warn_delegating_ctor_cycle) 10998 << Ctor; 10999 11000 // Don't add a note for a function delegating directo to itself. 11001 if (TCanonical != Canonical) 11002 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 11003 11004 CXXConstructorDecl *C = Target; 11005 while (C->getCanonicalDecl() != Canonical) { 11006 (void)C->getTargetConstructor()->hasBody(FNTarget); 11007 assert(FNTarget && "Ctor cycle through bodiless function"); 11008 11009 C 11010 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 11011 S.Diag(C->getLocation(), diag::note_which_delegates_to); 11012 } 11013 } 11014 11015 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11016 Invalid.insert(*CI); 11017 Current.clear(); 11018 } else { 11019 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 11020 } 11021} 11022 11023 11024void Sema::CheckDelegatingCtorCycles() { 11025 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 11026 11027 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11028 CE = Current.end(); 11029 11030 for (DelegatingCtorDeclsType::iterator 11031 I = DelegatingCtorDecls.begin(ExternalSource), 11032 E = DelegatingCtorDecls.end(); 11033 I != E; ++I) { 11034 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 11035 } 11036 11037 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 11038 (*CI)->setInvalidDecl(); 11039} 11040 11041namespace { 11042 /// \brief AST visitor that finds references to the 'this' expression. 11043 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { 11044 Sema &S; 11045 11046 public: 11047 explicit FindCXXThisExpr(Sema &S) : S(S) { } 11048 11049 bool VisitCXXThisExpr(CXXThisExpr *E) { 11050 S.Diag(E->getLocation(), diag::err_this_static_member_func) 11051 << E->isImplicit(); 11052 return false; 11053 } 11054 }; 11055} 11056 11057bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { 11058 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11059 if (!TSInfo) 11060 return false; 11061 11062 TypeLoc TL = TSInfo->getTypeLoc(); 11063 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11064 if (!ProtoTL) 11065 return false; 11066 11067 // C++11 [expr.prim.general]p3: 11068 // [The expression this] shall not appear before the optional 11069 // cv-qualifier-seq and it shall not appear within the declaration of a 11070 // static member function (although its type and value category are defined 11071 // within a static member function as they are within a non-static member 11072 // function). [ Note: this is because declaration matching does not occur 11073 // until the complete declarator is known. - end note ] 11074 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11075 FindCXXThisExpr Finder(*this); 11076 11077 // If the return type came after the cv-qualifier-seq, check it now. 11078 if (Proto->hasTrailingReturn() && 11079 !Finder.TraverseTypeLoc(ProtoTL->getResultLoc())) 11080 return true; 11081 11082 // Check the exception specification. 11083 if (checkThisInStaticMemberFunctionExceptionSpec(Method)) 11084 return true; 11085 11086 return checkThisInStaticMemberFunctionAttributes(Method); 11087} 11088 11089bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { 11090 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11091 if (!TSInfo) 11092 return false; 11093 11094 TypeLoc TL = TSInfo->getTypeLoc(); 11095 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11096 if (!ProtoTL) 11097 return false; 11098 11099 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11100 FindCXXThisExpr Finder(*this); 11101 11102 switch (Proto->getExceptionSpecType()) { 11103 case EST_Uninstantiated: 11104 case EST_Unevaluated: 11105 case EST_BasicNoexcept: 11106 case EST_DynamicNone: 11107 case EST_MSAny: 11108 case EST_None: 11109 break; 11110 11111 case EST_ComputedNoexcept: 11112 if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) 11113 return true; 11114 11115 case EST_Dynamic: 11116 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 11117 EEnd = Proto->exception_end(); 11118 E != EEnd; ++E) { 11119 if (!Finder.TraverseType(*E)) 11120 return true; 11121 } 11122 break; 11123 } 11124 11125 return false; 11126} 11127 11128bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { 11129 FindCXXThisExpr Finder(*this); 11130 11131 // Check attributes. 11132 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end(); 11133 A != AEnd; ++A) { 11134 // FIXME: This should be emitted by tblgen. 11135 Expr *Arg = 0; 11136 ArrayRef<Expr *> Args; 11137 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A)) 11138 Arg = G->getArg(); 11139 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A)) 11140 Arg = G->getArg(); 11141 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A)) 11142 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size()); 11143 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A)) 11144 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size()); 11145 else if (ExclusiveLockFunctionAttr *ELF 11146 = dyn_cast<ExclusiveLockFunctionAttr>(*A)) 11147 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size()); 11148 else if (SharedLockFunctionAttr *SLF 11149 = dyn_cast<SharedLockFunctionAttr>(*A)) 11150 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size()); 11151 else if (ExclusiveTrylockFunctionAttr *ETLF 11152 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) { 11153 Arg = ETLF->getSuccessValue(); 11154 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size()); 11155 } else if (SharedTrylockFunctionAttr *STLF 11156 = dyn_cast<SharedTrylockFunctionAttr>(*A)) { 11157 Arg = STLF->getSuccessValue(); 11158 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size()); 11159 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A)) 11160 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size()); 11161 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A)) 11162 Arg = LR->getArg(); 11163 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A)) 11164 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size()); 11165 else if (ExclusiveLocksRequiredAttr *ELR 11166 = dyn_cast<ExclusiveLocksRequiredAttr>(*A)) 11167 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size()); 11168 else if (SharedLocksRequiredAttr *SLR 11169 = dyn_cast<SharedLocksRequiredAttr>(*A)) 11170 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size()); 11171 11172 if (Arg && !Finder.TraverseStmt(Arg)) 11173 return true; 11174 11175 for (unsigned I = 0, N = Args.size(); I != N; ++I) { 11176 if (!Finder.TraverseStmt(Args[I])) 11177 return true; 11178 } 11179 } 11180 11181 return false; 11182} 11183 11184void 11185Sema::checkExceptionSpecification(ExceptionSpecificationType EST, 11186 ArrayRef<ParsedType> DynamicExceptions, 11187 ArrayRef<SourceRange> DynamicExceptionRanges, 11188 Expr *NoexceptExpr, 11189 llvm::SmallVectorImpl<QualType> &Exceptions, 11190 FunctionProtoType::ExtProtoInfo &EPI) { 11191 Exceptions.clear(); 11192 EPI.ExceptionSpecType = EST; 11193 if (EST == EST_Dynamic) { 11194 Exceptions.reserve(DynamicExceptions.size()); 11195 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { 11196 // FIXME: Preserve type source info. 11197 QualType ET = GetTypeFromParser(DynamicExceptions[ei]); 11198 11199 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 11200 collectUnexpandedParameterPacks(ET, Unexpanded); 11201 if (!Unexpanded.empty()) { 11202 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(), 11203 UPPC_ExceptionType, 11204 Unexpanded); 11205 continue; 11206 } 11207 11208 // Check that the type is valid for an exception spec, and 11209 // drop it if not. 11210 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) 11211 Exceptions.push_back(ET); 11212 } 11213 EPI.NumExceptions = Exceptions.size(); 11214 EPI.Exceptions = Exceptions.data(); 11215 return; 11216 } 11217 11218 if (EST == EST_ComputedNoexcept) { 11219 // If an error occurred, there's no expression here. 11220 if (NoexceptExpr) { 11221 assert((NoexceptExpr->isTypeDependent() || 11222 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 11223 Context.BoolTy) && 11224 "Parser should have made sure that the expression is boolean"); 11225 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { 11226 EPI.ExceptionSpecType = EST_BasicNoexcept; 11227 return; 11228 } 11229 11230 if (!NoexceptExpr->isValueDependent()) 11231 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0, 11232 diag::err_noexcept_needs_constant_expression, 11233 /*AllowFold*/ false).take(); 11234 EPI.NoexceptExpr = NoexceptExpr; 11235 } 11236 return; 11237 } 11238} 11239 11240/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 11241Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 11242 // Implicitly declared functions (e.g. copy constructors) are 11243 // __host__ __device__ 11244 if (D->isImplicit()) 11245 return CFT_HostDevice; 11246 11247 if (D->hasAttr<CUDAGlobalAttr>()) 11248 return CFT_Global; 11249 11250 if (D->hasAttr<CUDADeviceAttr>()) { 11251 if (D->hasAttr<CUDAHostAttr>()) 11252 return CFT_HostDevice; 11253 else 11254 return CFT_Device; 11255 } 11256 11257 return CFT_Host; 11258} 11259 11260bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 11261 CUDAFunctionTarget CalleeTarget) { 11262 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 11263 // Callable from the device only." 11264 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 11265 return true; 11266 11267 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 11268 // Callable from the host only." 11269 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 11270 // Callable from the host only." 11271 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 11272 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 11273 return true; 11274 11275 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 11276 return true; 11277 11278 return false; 11279} 11280