SemaDeclCXX.cpp revision f106f0ee3ba0c81d4c56f7935f518da53d78c08e
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/AST/ASTConsumer.h" 20#include "clang/AST/ASTContext.h" 21#include "clang/AST/ASTMutationListener.h" 22#include "clang/AST/CharUnits.h" 23#include "clang/AST/CXXInheritance.h" 24#include "clang/AST/DeclVisitor.h" 25#include "clang/AST/ExprCXX.h" 26#include "clang/AST/RecordLayout.h" 27#include "clang/AST/StmtVisitor.h" 28#include "clang/AST/TypeLoc.h" 29#include "clang/AST/TypeOrdering.h" 30#include "clang/Sema/DeclSpec.h" 31#include "clang/Sema/ParsedTemplate.h" 32#include "clang/Basic/PartialDiagnostic.h" 33#include "clang/Lex/Preprocessor.h" 34#include "llvm/ADT/DenseSet.h" 35#include "llvm/ADT/STLExtras.h" 36#include <map> 37#include <set> 38 39using namespace clang; 40 41//===----------------------------------------------------------------------===// 42// CheckDefaultArgumentVisitor 43//===----------------------------------------------------------------------===// 44 45namespace { 46 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 47 /// the default argument of a parameter to determine whether it 48 /// contains any ill-formed subexpressions. For example, this will 49 /// diagnose the use of local variables or parameters within the 50 /// default argument expression. 51 class CheckDefaultArgumentVisitor 52 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 53 Expr *DefaultArg; 54 Sema *S; 55 56 public: 57 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 58 : DefaultArg(defarg), S(s) {} 59 60 bool VisitExpr(Expr *Node); 61 bool VisitDeclRefExpr(DeclRefExpr *DRE); 62 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 63 }; 64 65 /// VisitExpr - Visit all of the children of this expression. 66 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 67 bool IsInvalid = false; 68 for (Stmt::child_range I = Node->children(); I; ++I) 69 IsInvalid |= Visit(*I); 70 return IsInvalid; 71 } 72 73 /// VisitDeclRefExpr - Visit a reference to a declaration, to 74 /// determine whether this declaration can be used in the default 75 /// argument expression. 76 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 77 NamedDecl *Decl = DRE->getDecl(); 78 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 79 // C++ [dcl.fct.default]p9 80 // Default arguments are evaluated each time the function is 81 // called. The order of evaluation of function arguments is 82 // unspecified. Consequently, parameters of a function shall not 83 // be used in default argument expressions, even if they are not 84 // evaluated. Parameters of a function declared before a default 85 // argument expression are in scope and can hide namespace and 86 // class member names. 87 return S->Diag(DRE->getSourceRange().getBegin(), 88 diag::err_param_default_argument_references_param) 89 << Param->getDeclName() << DefaultArg->getSourceRange(); 90 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 91 // C++ [dcl.fct.default]p7 92 // Local variables shall not be used in default argument 93 // expressions. 94 if (VDecl->isLocalVarDecl()) 95 return S->Diag(DRE->getSourceRange().getBegin(), 96 diag::err_param_default_argument_references_local) 97 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 98 } 99 100 return false; 101 } 102 103 /// VisitCXXThisExpr - Visit a C++ "this" expression. 104 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 105 // C++ [dcl.fct.default]p8: 106 // The keyword this shall not be used in a default argument of a 107 // member function. 108 return S->Diag(ThisE->getSourceRange().getBegin(), 109 diag::err_param_default_argument_references_this) 110 << ThisE->getSourceRange(); 111 } 112} 113 114void Sema::ImplicitExceptionSpecification::CalledDecl(CXXMethodDecl *Method) { 115 assert(Context && "ImplicitExceptionSpecification without an ASTContext"); 116 // If we have an MSAny or unknown spec already, don't bother. 117 if (!Method || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 118 return; 119 120 const FunctionProtoType *Proto 121 = Method->getType()->getAs<FunctionProtoType>(); 122 123 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 124 125 // If this function can throw any exceptions, make a note of that. 126 if (EST == EST_Delayed || EST == EST_MSAny || EST == EST_None) { 127 ClearExceptions(); 128 ComputedEST = EST; 129 return; 130 } 131 132 // FIXME: If the call to this decl is using any of its default arguments, we 133 // need to search them for potentially-throwing calls. 134 135 // If this function has a basic noexcept, it doesn't affect the outcome. 136 if (EST == EST_BasicNoexcept) 137 return; 138 139 // If we have a throw-all spec at this point, ignore the function. 140 if (ComputedEST == EST_None) 141 return; 142 143 // If we're still at noexcept(true) and there's a nothrow() callee, 144 // change to that specification. 145 if (EST == EST_DynamicNone) { 146 if (ComputedEST == EST_BasicNoexcept) 147 ComputedEST = EST_DynamicNone; 148 return; 149 } 150 151 // Check out noexcept specs. 152 if (EST == EST_ComputedNoexcept) { 153 FunctionProtoType::NoexceptResult NR = Proto->getNoexceptSpec(*Context); 154 assert(NR != FunctionProtoType::NR_NoNoexcept && 155 "Must have noexcept result for EST_ComputedNoexcept."); 156 assert(NR != FunctionProtoType::NR_Dependent && 157 "Should not generate implicit declarations for dependent cases, " 158 "and don't know how to handle them anyway."); 159 160 // noexcept(false) -> no spec on the new function 161 if (NR == FunctionProtoType::NR_Throw) { 162 ClearExceptions(); 163 ComputedEST = EST_None; 164 } 165 // noexcept(true) won't change anything either. 166 return; 167 } 168 169 assert(EST == EST_Dynamic && "EST case not considered earlier."); 170 assert(ComputedEST != EST_None && 171 "Shouldn't collect exceptions when throw-all is guaranteed."); 172 ComputedEST = EST_Dynamic; 173 // Record the exceptions in this function's exception specification. 174 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 175 EEnd = Proto->exception_end(); 176 E != EEnd; ++E) 177 if (ExceptionsSeen.insert(Context->getCanonicalType(*E))) 178 Exceptions.push_back(*E); 179} 180 181void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 182 if (!E || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 183 return; 184 185 // FIXME: 186 // 187 // C++0x [except.spec]p14: 188 // [An] implicit exception-specification specifies the type-id T if and 189 // only if T is allowed by the exception-specification of a function directly 190 // invoked by f's implicit definition; f shall allow all exceptions if any 191 // function it directly invokes allows all exceptions, and f shall allow no 192 // exceptions if every function it directly invokes allows no exceptions. 193 // 194 // Note in particular that if an implicit exception-specification is generated 195 // for a function containing a throw-expression, that specification can still 196 // be noexcept(true). 197 // 198 // Note also that 'directly invoked' is not defined in the standard, and there 199 // is no indication that we should only consider potentially-evaluated calls. 200 // 201 // Ultimately we should implement the intent of the standard: the exception 202 // specification should be the set of exceptions which can be thrown by the 203 // implicit definition. For now, we assume that any non-nothrow expression can 204 // throw any exception. 205 206 if (E->CanThrow(*Context)) 207 ComputedEST = EST_None; 208} 209 210bool 211Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 212 SourceLocation EqualLoc) { 213 if (RequireCompleteType(Param->getLocation(), Param->getType(), 214 diag::err_typecheck_decl_incomplete_type)) { 215 Param->setInvalidDecl(); 216 return true; 217 } 218 219 // C++ [dcl.fct.default]p5 220 // A default argument expression is implicitly converted (clause 221 // 4) to the parameter type. The default argument expression has 222 // the same semantic constraints as the initializer expression in 223 // a declaration of a variable of the parameter type, using the 224 // copy-initialization semantics (8.5). 225 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 226 Param); 227 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 228 EqualLoc); 229 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 230 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 231 MultiExprArg(*this, &Arg, 1)); 232 if (Result.isInvalid()) 233 return true; 234 Arg = Result.takeAs<Expr>(); 235 236 CheckImplicitConversions(Arg, EqualLoc); 237 Arg = MaybeCreateExprWithCleanups(Arg); 238 239 // Okay: add the default argument to the parameter 240 Param->setDefaultArg(Arg); 241 242 // We have already instantiated this parameter; provide each of the 243 // instantiations with the uninstantiated default argument. 244 UnparsedDefaultArgInstantiationsMap::iterator InstPos 245 = UnparsedDefaultArgInstantiations.find(Param); 246 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 247 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 248 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 249 250 // We're done tracking this parameter's instantiations. 251 UnparsedDefaultArgInstantiations.erase(InstPos); 252 } 253 254 return false; 255} 256 257/// ActOnParamDefaultArgument - Check whether the default argument 258/// provided for a function parameter is well-formed. If so, attach it 259/// to the parameter declaration. 260void 261Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 262 Expr *DefaultArg) { 263 if (!param || !DefaultArg) 264 return; 265 266 ParmVarDecl *Param = cast<ParmVarDecl>(param); 267 UnparsedDefaultArgLocs.erase(Param); 268 269 // Default arguments are only permitted in C++ 270 if (!getLangOptions().CPlusPlus) { 271 Diag(EqualLoc, diag::err_param_default_argument) 272 << DefaultArg->getSourceRange(); 273 Param->setInvalidDecl(); 274 return; 275 } 276 277 // Check for unexpanded parameter packs. 278 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 279 Param->setInvalidDecl(); 280 return; 281 } 282 283 // Check that the default argument is well-formed 284 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 285 if (DefaultArgChecker.Visit(DefaultArg)) { 286 Param->setInvalidDecl(); 287 return; 288 } 289 290 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 291} 292 293/// ActOnParamUnparsedDefaultArgument - We've seen a default 294/// argument for a function parameter, but we can't parse it yet 295/// because we're inside a class definition. Note that this default 296/// argument will be parsed later. 297void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 298 SourceLocation EqualLoc, 299 SourceLocation ArgLoc) { 300 if (!param) 301 return; 302 303 ParmVarDecl *Param = cast<ParmVarDecl>(param); 304 if (Param) 305 Param->setUnparsedDefaultArg(); 306 307 UnparsedDefaultArgLocs[Param] = ArgLoc; 308} 309 310/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 311/// the default argument for the parameter param failed. 312void Sema::ActOnParamDefaultArgumentError(Decl *param) { 313 if (!param) 314 return; 315 316 ParmVarDecl *Param = cast<ParmVarDecl>(param); 317 318 Param->setInvalidDecl(); 319 320 UnparsedDefaultArgLocs.erase(Param); 321} 322 323/// CheckExtraCXXDefaultArguments - Check for any extra default 324/// arguments in the declarator, which is not a function declaration 325/// or definition and therefore is not permitted to have default 326/// arguments. This routine should be invoked for every declarator 327/// that is not a function declaration or definition. 328void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 329 // C++ [dcl.fct.default]p3 330 // A default argument expression shall be specified only in the 331 // parameter-declaration-clause of a function declaration or in a 332 // template-parameter (14.1). It shall not be specified for a 333 // parameter pack. If it is specified in a 334 // parameter-declaration-clause, it shall not occur within a 335 // declarator or abstract-declarator of a parameter-declaration. 336 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 337 DeclaratorChunk &chunk = D.getTypeObject(i); 338 if (chunk.Kind == DeclaratorChunk::Function) { 339 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 340 ParmVarDecl *Param = 341 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 342 if (Param->hasUnparsedDefaultArg()) { 343 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 344 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 345 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 346 delete Toks; 347 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 348 } else if (Param->getDefaultArg()) { 349 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 350 << Param->getDefaultArg()->getSourceRange(); 351 Param->setDefaultArg(0); 352 } 353 } 354 } 355 } 356} 357 358// MergeCXXFunctionDecl - Merge two declarations of the same C++ 359// function, once we already know that they have the same 360// type. Subroutine of MergeFunctionDecl. Returns true if there was an 361// error, false otherwise. 362bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 363 bool Invalid = false; 364 365 // C++ [dcl.fct.default]p4: 366 // For non-template functions, default arguments can be added in 367 // later declarations of a function in the same 368 // scope. Declarations in different scopes have completely 369 // distinct sets of default arguments. That is, declarations in 370 // inner scopes do not acquire default arguments from 371 // declarations in outer scopes, and vice versa. In a given 372 // function declaration, all parameters subsequent to a 373 // parameter with a default argument shall have default 374 // arguments supplied in this or previous declarations. A 375 // default argument shall not be redefined by a later 376 // declaration (not even to the same value). 377 // 378 // C++ [dcl.fct.default]p6: 379 // Except for member functions of class templates, the default arguments 380 // in a member function definition that appears outside of the class 381 // definition are added to the set of default arguments provided by the 382 // member function declaration in the class definition. 383 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 384 ParmVarDecl *OldParam = Old->getParamDecl(p); 385 ParmVarDecl *NewParam = New->getParamDecl(p); 386 387 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 388 389 unsigned DiagDefaultParamID = 390 diag::err_param_default_argument_redefinition; 391 392 // MSVC accepts that default parameters be redefined for member functions 393 // of template class. The new default parameter's value is ignored. 394 Invalid = true; 395 if (getLangOptions().MicrosoftExt) { 396 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 397 if (MD && MD->getParent()->getDescribedClassTemplate()) { 398 // Merge the old default argument into the new parameter. 399 NewParam->setHasInheritedDefaultArg(); 400 if (OldParam->hasUninstantiatedDefaultArg()) 401 NewParam->setUninstantiatedDefaultArg( 402 OldParam->getUninstantiatedDefaultArg()); 403 else 404 NewParam->setDefaultArg(OldParam->getInit()); 405 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 406 Invalid = false; 407 } 408 } 409 410 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 411 // hint here. Alternatively, we could walk the type-source information 412 // for NewParam to find the last source location in the type... but it 413 // isn't worth the effort right now. This is the kind of test case that 414 // is hard to get right: 415 // int f(int); 416 // void g(int (*fp)(int) = f); 417 // void g(int (*fp)(int) = &f); 418 Diag(NewParam->getLocation(), DiagDefaultParamID) 419 << NewParam->getDefaultArgRange(); 420 421 // Look for the function declaration where the default argument was 422 // actually written, which may be a declaration prior to Old. 423 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 424 Older; Older = Older->getPreviousDeclaration()) { 425 if (!Older->getParamDecl(p)->hasDefaultArg()) 426 break; 427 428 OldParam = Older->getParamDecl(p); 429 } 430 431 Diag(OldParam->getLocation(), diag::note_previous_definition) 432 << OldParam->getDefaultArgRange(); 433 } else if (OldParam->hasDefaultArg()) { 434 // Merge the old default argument into the new parameter. 435 // It's important to use getInit() here; getDefaultArg() 436 // strips off any top-level ExprWithCleanups. 437 NewParam->setHasInheritedDefaultArg(); 438 if (OldParam->hasUninstantiatedDefaultArg()) 439 NewParam->setUninstantiatedDefaultArg( 440 OldParam->getUninstantiatedDefaultArg()); 441 else 442 NewParam->setDefaultArg(OldParam->getInit()); 443 } else if (NewParam->hasDefaultArg()) { 444 if (New->getDescribedFunctionTemplate()) { 445 // Paragraph 4, quoted above, only applies to non-template functions. 446 Diag(NewParam->getLocation(), 447 diag::err_param_default_argument_template_redecl) 448 << NewParam->getDefaultArgRange(); 449 Diag(Old->getLocation(), diag::note_template_prev_declaration) 450 << false; 451 } else if (New->getTemplateSpecializationKind() 452 != TSK_ImplicitInstantiation && 453 New->getTemplateSpecializationKind() != TSK_Undeclared) { 454 // C++ [temp.expr.spec]p21: 455 // Default function arguments shall not be specified in a declaration 456 // or a definition for one of the following explicit specializations: 457 // - the explicit specialization of a function template; 458 // - the explicit specialization of a member function template; 459 // - the explicit specialization of a member function of a class 460 // template where the class template specialization to which the 461 // member function specialization belongs is implicitly 462 // instantiated. 463 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 464 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 465 << New->getDeclName() 466 << NewParam->getDefaultArgRange(); 467 } else if (New->getDeclContext()->isDependentContext()) { 468 // C++ [dcl.fct.default]p6 (DR217): 469 // Default arguments for a member function of a class template shall 470 // be specified on the initial declaration of the member function 471 // within the class template. 472 // 473 // Reading the tea leaves a bit in DR217 and its reference to DR205 474 // leads me to the conclusion that one cannot add default function 475 // arguments for an out-of-line definition of a member function of a 476 // dependent type. 477 int WhichKind = 2; 478 if (CXXRecordDecl *Record 479 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 480 if (Record->getDescribedClassTemplate()) 481 WhichKind = 0; 482 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 483 WhichKind = 1; 484 else 485 WhichKind = 2; 486 } 487 488 Diag(NewParam->getLocation(), 489 diag::err_param_default_argument_member_template_redecl) 490 << WhichKind 491 << NewParam->getDefaultArgRange(); 492 } else if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(New)) { 493 CXXSpecialMember NewSM = getSpecialMember(Ctor), 494 OldSM = getSpecialMember(cast<CXXConstructorDecl>(Old)); 495 if (NewSM != OldSM) { 496 Diag(NewParam->getLocation(),diag::warn_default_arg_makes_ctor_special) 497 << NewParam->getDefaultArgRange() << NewSM; 498 Diag(Old->getLocation(), diag::note_previous_declaration_special) 499 << OldSM; 500 } 501 } 502 } 503 } 504 505 // C++0x [dcl.constexpr]p1: If any declaration of a function or function 506 // template has a constexpr specifier then all its declarations shall 507 // contain the constexpr specifier. [Note: An explicit specialization can 508 // differ from the template declaration with respect to the constexpr 509 // specifier. -- end note] 510 // 511 // FIXME: Don't reject changes in constexpr in explicit specializations. 512 if (New->isConstexpr() != Old->isConstexpr()) { 513 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 514 << New << New->isConstexpr(); 515 Diag(Old->getLocation(), diag::note_previous_declaration); 516 Invalid = true; 517 } 518 519 if (CheckEquivalentExceptionSpec(Old, New)) 520 Invalid = true; 521 522 return Invalid; 523} 524 525/// \brief Merge the exception specifications of two variable declarations. 526/// 527/// This is called when there's a redeclaration of a VarDecl. The function 528/// checks if the redeclaration might have an exception specification and 529/// validates compatibility and merges the specs if necessary. 530void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 531 // Shortcut if exceptions are disabled. 532 if (!getLangOptions().CXXExceptions) 533 return; 534 535 assert(Context.hasSameType(New->getType(), Old->getType()) && 536 "Should only be called if types are otherwise the same."); 537 538 QualType NewType = New->getType(); 539 QualType OldType = Old->getType(); 540 541 // We're only interested in pointers and references to functions, as well 542 // as pointers to member functions. 543 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 544 NewType = R->getPointeeType(); 545 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 546 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 547 NewType = P->getPointeeType(); 548 OldType = OldType->getAs<PointerType>()->getPointeeType(); 549 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 550 NewType = M->getPointeeType(); 551 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 552 } 553 554 if (!NewType->isFunctionProtoType()) 555 return; 556 557 // There's lots of special cases for functions. For function pointers, system 558 // libraries are hopefully not as broken so that we don't need these 559 // workarounds. 560 if (CheckEquivalentExceptionSpec( 561 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 562 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 563 New->setInvalidDecl(); 564 } 565} 566 567/// CheckCXXDefaultArguments - Verify that the default arguments for a 568/// function declaration are well-formed according to C++ 569/// [dcl.fct.default]. 570void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 571 unsigned NumParams = FD->getNumParams(); 572 unsigned p; 573 574 // Find first parameter with a default argument 575 for (p = 0; p < NumParams; ++p) { 576 ParmVarDecl *Param = FD->getParamDecl(p); 577 if (Param->hasDefaultArg()) 578 break; 579 } 580 581 // C++ [dcl.fct.default]p4: 582 // In a given function declaration, all parameters 583 // subsequent to a parameter with a default argument shall 584 // have default arguments supplied in this or previous 585 // declarations. A default argument shall not be redefined 586 // by a later declaration (not even to the same value). 587 unsigned LastMissingDefaultArg = 0; 588 for (; p < NumParams; ++p) { 589 ParmVarDecl *Param = FD->getParamDecl(p); 590 if (!Param->hasDefaultArg()) { 591 if (Param->isInvalidDecl()) 592 /* We already complained about this parameter. */; 593 else if (Param->getIdentifier()) 594 Diag(Param->getLocation(), 595 diag::err_param_default_argument_missing_name) 596 << Param->getIdentifier(); 597 else 598 Diag(Param->getLocation(), 599 diag::err_param_default_argument_missing); 600 601 LastMissingDefaultArg = p; 602 } 603 } 604 605 if (LastMissingDefaultArg > 0) { 606 // Some default arguments were missing. Clear out all of the 607 // default arguments up to (and including) the last missing 608 // default argument, so that we leave the function parameters 609 // in a semantically valid state. 610 for (p = 0; p <= LastMissingDefaultArg; ++p) { 611 ParmVarDecl *Param = FD->getParamDecl(p); 612 if (Param->hasDefaultArg()) { 613 Param->setDefaultArg(0); 614 } 615 } 616 } 617} 618 619// CheckConstexprParameterTypes - Check whether a function's parameter types 620// are all literal types. If so, return true. If not, produce a suitable 621// diagnostic depending on @p CCK and return false. 622static bool CheckConstexprParameterTypes(Sema &SemaRef, const FunctionDecl *FD, 623 Sema::CheckConstexprKind CCK) { 624 unsigned ArgIndex = 0; 625 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 626 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 627 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 628 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 629 SourceLocation ParamLoc = PD->getLocation(); 630 if (!(*i)->isDependentType() && 631 SemaRef.RequireLiteralType(ParamLoc, *i, CCK == Sema::CCK_Declaration ? 632 SemaRef.PDiag(diag::err_constexpr_non_literal_param) 633 << ArgIndex+1 << PD->getSourceRange() 634 << isa<CXXConstructorDecl>(FD) : 635 SemaRef.PDiag(), 636 /*AllowIncompleteType*/ true)) { 637 if (CCK == Sema::CCK_NoteNonConstexprInstantiation) 638 SemaRef.Diag(ParamLoc, diag::note_constexpr_tmpl_non_literal_param) 639 << ArgIndex+1 << PD->getSourceRange() 640 << isa<CXXConstructorDecl>(FD) << *i; 641 return false; 642 } 643 } 644 return true; 645} 646 647// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 648// the requirements of a constexpr function declaration or a constexpr 649// constructor declaration. Return true if it does, false if not. 650// 651// This implements C++0x [dcl.constexpr]p3,4, as amended by N3308. 652// 653// \param CCK Specifies whether to produce diagnostics if the function does not 654// satisfy the requirements. 655bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD, 656 CheckConstexprKind CCK) { 657 assert((CCK != CCK_NoteNonConstexprInstantiation || 658 (NewFD->getTemplateInstantiationPattern() && 659 NewFD->getTemplateInstantiationPattern()->isConstexpr())) && 660 "only constexpr templates can be instantiated non-constexpr"); 661 662 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(NewFD)) { 663 // C++0x [dcl.constexpr]p4: 664 // In the definition of a constexpr constructor, each of the parameter 665 // types shall be a literal type. 666 if (!CheckConstexprParameterTypes(*this, NewFD, CCK)) 667 return false; 668 669 // In addition, either its function-body shall be = delete or = default or 670 // it shall satisfy the following constraints: 671 // - the class shall not have any virtual base classes; 672 const CXXRecordDecl *RD = CD->getParent(); 673 if (RD->getNumVBases()) { 674 // Note, this is still illegal if the body is = default, since the 675 // implicit body does not satisfy the requirements of a constexpr 676 // constructor. We also reject cases where the body is = delete, as 677 // required by N3308. 678 if (CCK != CCK_Instantiation) { 679 Diag(NewFD->getLocation(), 680 CCK == CCK_Declaration ? diag::err_constexpr_virtual_base 681 : diag::note_constexpr_tmpl_virtual_base) 682 << RD->isStruct() << RD->getNumVBases(); 683 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 684 E = RD->vbases_end(); I != E; ++I) 685 Diag(I->getSourceRange().getBegin(), 686 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 687 } 688 return false; 689 } 690 } else { 691 // C++0x [dcl.constexpr]p3: 692 // The definition of a constexpr function shall satisfy the following 693 // constraints: 694 // - it shall not be virtual; 695 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 696 if (Method && Method->isVirtual()) { 697 if (CCK != CCK_Instantiation) { 698 Diag(NewFD->getLocation(), 699 CCK == CCK_Declaration ? diag::err_constexpr_virtual 700 : diag::note_constexpr_tmpl_virtual); 701 702 // If it's not obvious why this function is virtual, find an overridden 703 // function which uses the 'virtual' keyword. 704 const CXXMethodDecl *WrittenVirtual = Method; 705 while (!WrittenVirtual->isVirtualAsWritten()) 706 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 707 if (WrittenVirtual != Method) 708 Diag(WrittenVirtual->getLocation(), 709 diag::note_overridden_virtual_function); 710 } 711 return false; 712 } 713 714 // - its return type shall be a literal type; 715 QualType RT = NewFD->getResultType(); 716 if (!RT->isDependentType() && 717 RequireLiteralType(NewFD->getLocation(), RT, CCK == CCK_Declaration ? 718 PDiag(diag::err_constexpr_non_literal_return) : 719 PDiag(), 720 /*AllowIncompleteType*/ true)) { 721 if (CCK == CCK_NoteNonConstexprInstantiation) 722 Diag(NewFD->getLocation(), 723 diag::note_constexpr_tmpl_non_literal_return) << RT; 724 return false; 725 } 726 727 // - each of its parameter types shall be a literal type; 728 if (!CheckConstexprParameterTypes(*this, NewFD, CCK)) 729 return false; 730 } 731 732 return true; 733} 734 735/// Check the given declaration statement is legal within a constexpr function 736/// body. C++0x [dcl.constexpr]p3,p4. 737/// 738/// \return true if the body is OK, false if we have diagnosed a problem. 739static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 740 DeclStmt *DS) { 741 // C++0x [dcl.constexpr]p3 and p4: 742 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 743 // contain only 744 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 745 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 746 switch ((*DclIt)->getKind()) { 747 case Decl::StaticAssert: 748 case Decl::Using: 749 case Decl::UsingShadow: 750 case Decl::UsingDirective: 751 case Decl::UnresolvedUsingTypename: 752 // - static_assert-declarations 753 // - using-declarations, 754 // - using-directives, 755 continue; 756 757 case Decl::Typedef: 758 case Decl::TypeAlias: { 759 // - typedef declarations and alias-declarations that do not define 760 // classes or enumerations, 761 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 762 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 763 // Don't allow variably-modified types in constexpr functions. 764 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 765 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 766 << TL.getSourceRange() << TL.getType() 767 << isa<CXXConstructorDecl>(Dcl); 768 return false; 769 } 770 continue; 771 } 772 773 case Decl::Enum: 774 case Decl::CXXRecord: 775 // As an extension, we allow the declaration (but not the definition) of 776 // classes and enumerations in all declarations, not just in typedef and 777 // alias declarations. 778 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 779 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 780 << isa<CXXConstructorDecl>(Dcl); 781 return false; 782 } 783 continue; 784 785 case Decl::Var: 786 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 787 << isa<CXXConstructorDecl>(Dcl); 788 return false; 789 790 default: 791 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 792 << isa<CXXConstructorDecl>(Dcl); 793 return false; 794 } 795 } 796 797 return true; 798} 799 800/// Check that the given field is initialized within a constexpr constructor. 801/// 802/// \param Dcl The constexpr constructor being checked. 803/// \param Field The field being checked. This may be a member of an anonymous 804/// struct or union nested within the class being checked. 805/// \param Inits All declarations, including anonymous struct/union members and 806/// indirect members, for which any initialization was provided. 807/// \param Diagnosed Set to true if an error is produced. 808static void CheckConstexprCtorInitializer(Sema &SemaRef, 809 const FunctionDecl *Dcl, 810 FieldDecl *Field, 811 llvm::SmallSet<Decl*, 16> &Inits, 812 bool &Diagnosed) { 813 if (Field->isUnnamedBitfield()) 814 return; 815 816 if (!Inits.count(Field)) { 817 if (!Diagnosed) { 818 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 819 Diagnosed = true; 820 } 821 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 822 } else if (Field->isAnonymousStructOrUnion()) { 823 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 824 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 825 I != E; ++I) 826 // If an anonymous union contains an anonymous struct of which any member 827 // is initialized, all members must be initialized. 828 if (!RD->isUnion() || Inits.count(*I)) 829 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 830 } 831} 832 833/// Check the body for the given constexpr function declaration only contains 834/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 835/// 836/// \return true if the body is OK, false if we have diagnosed a problem. 837bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 838 if (isa<CXXTryStmt>(Body)) { 839 // C++0x [dcl.constexpr]p3: 840 // The definition of a constexpr function shall satisfy the following 841 // constraints: [...] 842 // - its function-body shall be = delete, = default, or a 843 // compound-statement 844 // 845 // C++0x [dcl.constexpr]p4: 846 // In the definition of a constexpr constructor, [...] 847 // - its function-body shall not be a function-try-block; 848 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 849 << isa<CXXConstructorDecl>(Dcl); 850 return false; 851 } 852 853 // - its function-body shall be [...] a compound-statement that contains only 854 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 855 856 llvm::SmallVector<SourceLocation, 4> ReturnStmts; 857 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 858 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 859 switch ((*BodyIt)->getStmtClass()) { 860 case Stmt::NullStmtClass: 861 // - null statements, 862 continue; 863 864 case Stmt::DeclStmtClass: 865 // - static_assert-declarations 866 // - using-declarations, 867 // - using-directives, 868 // - typedef declarations and alias-declarations that do not define 869 // classes or enumerations, 870 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 871 return false; 872 continue; 873 874 case Stmt::ReturnStmtClass: 875 // - and exactly one return statement; 876 if (isa<CXXConstructorDecl>(Dcl)) 877 break; 878 879 ReturnStmts.push_back((*BodyIt)->getLocStart()); 880 // FIXME 881 // - every constructor call and implicit conversion used in initializing 882 // the return value shall be one of those allowed in a constant 883 // expression. 884 // Deal with this as part of a general check that the function can produce 885 // a constant expression (for [dcl.constexpr]p5). 886 continue; 887 888 default: 889 break; 890 } 891 892 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 893 << isa<CXXConstructorDecl>(Dcl); 894 return false; 895 } 896 897 if (const CXXConstructorDecl *Constructor 898 = dyn_cast<CXXConstructorDecl>(Dcl)) { 899 const CXXRecordDecl *RD = Constructor->getParent(); 900 // - every non-static data member and base class sub-object shall be 901 // initialized; 902 if (RD->isUnion()) { 903 // DR1359: Exactly one member of a union shall be initialized. 904 if (Constructor->getNumCtorInitializers() == 0) { 905 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 906 return false; 907 } 908 } else if (!Constructor->isDependentContext() && 909 !Constructor->isDelegatingConstructor()) { 910 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 911 912 // Skip detailed checking if we have enough initializers, and we would 913 // allow at most one initializer per member. 914 bool AnyAnonStructUnionMembers = false; 915 unsigned Fields = 0; 916 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 917 E = RD->field_end(); I != E; ++I, ++Fields) { 918 if ((*I)->isAnonymousStructOrUnion()) { 919 AnyAnonStructUnionMembers = true; 920 break; 921 } 922 } 923 if (AnyAnonStructUnionMembers || 924 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 925 // Check initialization of non-static data members. Base classes are 926 // always initialized so do not need to be checked. Dependent bases 927 // might not have initializers in the member initializer list. 928 llvm::SmallSet<Decl*, 16> Inits; 929 for (CXXConstructorDecl::init_const_iterator 930 I = Constructor->init_begin(), E = Constructor->init_end(); 931 I != E; ++I) { 932 if (FieldDecl *FD = (*I)->getMember()) 933 Inits.insert(FD); 934 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 935 Inits.insert(ID->chain_begin(), ID->chain_end()); 936 } 937 938 bool Diagnosed = false; 939 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 940 E = RD->field_end(); I != E; ++I) 941 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 942 if (Diagnosed) 943 return false; 944 } 945 } 946 947 // FIXME 948 // - every constructor involved in initializing non-static data members 949 // and base class sub-objects shall be a constexpr constructor; 950 // - every assignment-expression that is an initializer-clause appearing 951 // directly or indirectly within a brace-or-equal-initializer for 952 // a non-static data member that is not named by a mem-initializer-id 953 // shall be a constant expression; and 954 // - every implicit conversion used in converting a constructor argument 955 // to the corresponding parameter type and converting 956 // a full-expression to the corresponding member type shall be one of 957 // those allowed in a constant expression. 958 // Deal with these as part of a general check that the function can produce 959 // a constant expression (for [dcl.constexpr]p5). 960 } else { 961 if (ReturnStmts.empty()) { 962 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 963 return false; 964 } 965 if (ReturnStmts.size() > 1) { 966 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 967 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 968 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 969 return false; 970 } 971 } 972 973 return true; 974} 975 976/// isCurrentClassName - Determine whether the identifier II is the 977/// name of the class type currently being defined. In the case of 978/// nested classes, this will only return true if II is the name of 979/// the innermost class. 980bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 981 const CXXScopeSpec *SS) { 982 assert(getLangOptions().CPlusPlus && "No class names in C!"); 983 984 CXXRecordDecl *CurDecl; 985 if (SS && SS->isSet() && !SS->isInvalid()) { 986 DeclContext *DC = computeDeclContext(*SS, true); 987 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 988 } else 989 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 990 991 if (CurDecl && CurDecl->getIdentifier()) 992 return &II == CurDecl->getIdentifier(); 993 else 994 return false; 995} 996 997/// \brief Check the validity of a C++ base class specifier. 998/// 999/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1000/// and returns NULL otherwise. 1001CXXBaseSpecifier * 1002Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1003 SourceRange SpecifierRange, 1004 bool Virtual, AccessSpecifier Access, 1005 TypeSourceInfo *TInfo, 1006 SourceLocation EllipsisLoc) { 1007 QualType BaseType = TInfo->getType(); 1008 1009 // C++ [class.union]p1: 1010 // A union shall not have base classes. 1011 if (Class->isUnion()) { 1012 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1013 << SpecifierRange; 1014 return 0; 1015 } 1016 1017 if (EllipsisLoc.isValid() && 1018 !TInfo->getType()->containsUnexpandedParameterPack()) { 1019 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1020 << TInfo->getTypeLoc().getSourceRange(); 1021 EllipsisLoc = SourceLocation(); 1022 } 1023 1024 if (BaseType->isDependentType()) 1025 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1026 Class->getTagKind() == TTK_Class, 1027 Access, TInfo, EllipsisLoc); 1028 1029 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1030 1031 // Base specifiers must be record types. 1032 if (!BaseType->isRecordType()) { 1033 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1034 return 0; 1035 } 1036 1037 // C++ [class.union]p1: 1038 // A union shall not be used as a base class. 1039 if (BaseType->isUnionType()) { 1040 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1041 return 0; 1042 } 1043 1044 // C++ [class.derived]p2: 1045 // The class-name in a base-specifier shall not be an incompletely 1046 // defined class. 1047 if (RequireCompleteType(BaseLoc, BaseType, 1048 PDiag(diag::err_incomplete_base_class) 1049 << SpecifierRange)) { 1050 Class->setInvalidDecl(); 1051 return 0; 1052 } 1053 1054 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1055 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1056 assert(BaseDecl && "Record type has no declaration"); 1057 BaseDecl = BaseDecl->getDefinition(); 1058 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1059 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1060 assert(CXXBaseDecl && "Base type is not a C++ type"); 1061 1062 // C++ [class]p3: 1063 // If a class is marked final and it appears as a base-type-specifier in 1064 // base-clause, the program is ill-formed. 1065 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1066 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1067 << CXXBaseDecl->getDeclName(); 1068 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1069 << CXXBaseDecl->getDeclName(); 1070 return 0; 1071 } 1072 1073 if (BaseDecl->isInvalidDecl()) 1074 Class->setInvalidDecl(); 1075 1076 // Create the base specifier. 1077 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1078 Class->getTagKind() == TTK_Class, 1079 Access, TInfo, EllipsisLoc); 1080} 1081 1082/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1083/// one entry in the base class list of a class specifier, for 1084/// example: 1085/// class foo : public bar, virtual private baz { 1086/// 'public bar' and 'virtual private baz' are each base-specifiers. 1087BaseResult 1088Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1089 bool Virtual, AccessSpecifier Access, 1090 ParsedType basetype, SourceLocation BaseLoc, 1091 SourceLocation EllipsisLoc) { 1092 if (!classdecl) 1093 return true; 1094 1095 AdjustDeclIfTemplate(classdecl); 1096 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1097 if (!Class) 1098 return true; 1099 1100 TypeSourceInfo *TInfo = 0; 1101 GetTypeFromParser(basetype, &TInfo); 1102 1103 if (EllipsisLoc.isInvalid() && 1104 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1105 UPPC_BaseType)) 1106 return true; 1107 1108 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1109 Virtual, Access, TInfo, 1110 EllipsisLoc)) 1111 return BaseSpec; 1112 1113 return true; 1114} 1115 1116/// \brief Performs the actual work of attaching the given base class 1117/// specifiers to a C++ class. 1118bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1119 unsigned NumBases) { 1120 if (NumBases == 0) 1121 return false; 1122 1123 // Used to keep track of which base types we have already seen, so 1124 // that we can properly diagnose redundant direct base types. Note 1125 // that the key is always the unqualified canonical type of the base 1126 // class. 1127 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1128 1129 // Copy non-redundant base specifiers into permanent storage. 1130 unsigned NumGoodBases = 0; 1131 bool Invalid = false; 1132 for (unsigned idx = 0; idx < NumBases; ++idx) { 1133 QualType NewBaseType 1134 = Context.getCanonicalType(Bases[idx]->getType()); 1135 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1136 if (KnownBaseTypes[NewBaseType]) { 1137 // C++ [class.mi]p3: 1138 // A class shall not be specified as a direct base class of a 1139 // derived class more than once. 1140 Diag(Bases[idx]->getSourceRange().getBegin(), 1141 diag::err_duplicate_base_class) 1142 << KnownBaseTypes[NewBaseType]->getType() 1143 << Bases[idx]->getSourceRange(); 1144 1145 // Delete the duplicate base class specifier; we're going to 1146 // overwrite its pointer later. 1147 Context.Deallocate(Bases[idx]); 1148 1149 Invalid = true; 1150 } else { 1151 // Okay, add this new base class. 1152 KnownBaseTypes[NewBaseType] = Bases[idx]; 1153 Bases[NumGoodBases++] = Bases[idx]; 1154 } 1155 } 1156 1157 // Attach the remaining base class specifiers to the derived class. 1158 Class->setBases(Bases, NumGoodBases); 1159 1160 // Delete the remaining (good) base class specifiers, since their 1161 // data has been copied into the CXXRecordDecl. 1162 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1163 Context.Deallocate(Bases[idx]); 1164 1165 return Invalid; 1166} 1167 1168/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1169/// class, after checking whether there are any duplicate base 1170/// classes. 1171void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1172 unsigned NumBases) { 1173 if (!ClassDecl || !Bases || !NumBases) 1174 return; 1175 1176 AdjustDeclIfTemplate(ClassDecl); 1177 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1178 (CXXBaseSpecifier**)(Bases), NumBases); 1179} 1180 1181static CXXRecordDecl *GetClassForType(QualType T) { 1182 if (const RecordType *RT = T->getAs<RecordType>()) 1183 return cast<CXXRecordDecl>(RT->getDecl()); 1184 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1185 return ICT->getDecl(); 1186 else 1187 return 0; 1188} 1189 1190/// \brief Determine whether the type \p Derived is a C++ class that is 1191/// derived from the type \p Base. 1192bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1193 if (!getLangOptions().CPlusPlus) 1194 return false; 1195 1196 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1197 if (!DerivedRD) 1198 return false; 1199 1200 CXXRecordDecl *BaseRD = GetClassForType(Base); 1201 if (!BaseRD) 1202 return false; 1203 1204 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1205 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1206} 1207 1208/// \brief Determine whether the type \p Derived is a C++ class that is 1209/// derived from the type \p Base. 1210bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1211 if (!getLangOptions().CPlusPlus) 1212 return false; 1213 1214 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1215 if (!DerivedRD) 1216 return false; 1217 1218 CXXRecordDecl *BaseRD = GetClassForType(Base); 1219 if (!BaseRD) 1220 return false; 1221 1222 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1223} 1224 1225void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1226 CXXCastPath &BasePathArray) { 1227 assert(BasePathArray.empty() && "Base path array must be empty!"); 1228 assert(Paths.isRecordingPaths() && "Must record paths!"); 1229 1230 const CXXBasePath &Path = Paths.front(); 1231 1232 // We first go backward and check if we have a virtual base. 1233 // FIXME: It would be better if CXXBasePath had the base specifier for 1234 // the nearest virtual base. 1235 unsigned Start = 0; 1236 for (unsigned I = Path.size(); I != 0; --I) { 1237 if (Path[I - 1].Base->isVirtual()) { 1238 Start = I - 1; 1239 break; 1240 } 1241 } 1242 1243 // Now add all bases. 1244 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1245 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1246} 1247 1248/// \brief Determine whether the given base path includes a virtual 1249/// base class. 1250bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1251 for (CXXCastPath::const_iterator B = BasePath.begin(), 1252 BEnd = BasePath.end(); 1253 B != BEnd; ++B) 1254 if ((*B)->isVirtual()) 1255 return true; 1256 1257 return false; 1258} 1259 1260/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1261/// conversion (where Derived and Base are class types) is 1262/// well-formed, meaning that the conversion is unambiguous (and 1263/// that all of the base classes are accessible). Returns true 1264/// and emits a diagnostic if the code is ill-formed, returns false 1265/// otherwise. Loc is the location where this routine should point to 1266/// if there is an error, and Range is the source range to highlight 1267/// if there is an error. 1268bool 1269Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1270 unsigned InaccessibleBaseID, 1271 unsigned AmbigiousBaseConvID, 1272 SourceLocation Loc, SourceRange Range, 1273 DeclarationName Name, 1274 CXXCastPath *BasePath) { 1275 // First, determine whether the path from Derived to Base is 1276 // ambiguous. This is slightly more expensive than checking whether 1277 // the Derived to Base conversion exists, because here we need to 1278 // explore multiple paths to determine if there is an ambiguity. 1279 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1280 /*DetectVirtual=*/false); 1281 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1282 assert(DerivationOkay && 1283 "Can only be used with a derived-to-base conversion"); 1284 (void)DerivationOkay; 1285 1286 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1287 if (InaccessibleBaseID) { 1288 // Check that the base class can be accessed. 1289 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1290 InaccessibleBaseID)) { 1291 case AR_inaccessible: 1292 return true; 1293 case AR_accessible: 1294 case AR_dependent: 1295 case AR_delayed: 1296 break; 1297 } 1298 } 1299 1300 // Build a base path if necessary. 1301 if (BasePath) 1302 BuildBasePathArray(Paths, *BasePath); 1303 return false; 1304 } 1305 1306 // We know that the derived-to-base conversion is ambiguous, and 1307 // we're going to produce a diagnostic. Perform the derived-to-base 1308 // search just one more time to compute all of the possible paths so 1309 // that we can print them out. This is more expensive than any of 1310 // the previous derived-to-base checks we've done, but at this point 1311 // performance isn't as much of an issue. 1312 Paths.clear(); 1313 Paths.setRecordingPaths(true); 1314 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1315 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1316 (void)StillOkay; 1317 1318 // Build up a textual representation of the ambiguous paths, e.g., 1319 // D -> B -> A, that will be used to illustrate the ambiguous 1320 // conversions in the diagnostic. We only print one of the paths 1321 // to each base class subobject. 1322 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1323 1324 Diag(Loc, AmbigiousBaseConvID) 1325 << Derived << Base << PathDisplayStr << Range << Name; 1326 return true; 1327} 1328 1329bool 1330Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1331 SourceLocation Loc, SourceRange Range, 1332 CXXCastPath *BasePath, 1333 bool IgnoreAccess) { 1334 return CheckDerivedToBaseConversion(Derived, Base, 1335 IgnoreAccess ? 0 1336 : diag::err_upcast_to_inaccessible_base, 1337 diag::err_ambiguous_derived_to_base_conv, 1338 Loc, Range, DeclarationName(), 1339 BasePath); 1340} 1341 1342 1343/// @brief Builds a string representing ambiguous paths from a 1344/// specific derived class to different subobjects of the same base 1345/// class. 1346/// 1347/// This function builds a string that can be used in error messages 1348/// to show the different paths that one can take through the 1349/// inheritance hierarchy to go from the derived class to different 1350/// subobjects of a base class. The result looks something like this: 1351/// @code 1352/// struct D -> struct B -> struct A 1353/// struct D -> struct C -> struct A 1354/// @endcode 1355std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1356 std::string PathDisplayStr; 1357 std::set<unsigned> DisplayedPaths; 1358 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1359 Path != Paths.end(); ++Path) { 1360 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1361 // We haven't displayed a path to this particular base 1362 // class subobject yet. 1363 PathDisplayStr += "\n "; 1364 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1365 for (CXXBasePath::const_iterator Element = Path->begin(); 1366 Element != Path->end(); ++Element) 1367 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1368 } 1369 } 1370 1371 return PathDisplayStr; 1372} 1373 1374//===----------------------------------------------------------------------===// 1375// C++ class member Handling 1376//===----------------------------------------------------------------------===// 1377 1378/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1379bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1380 SourceLocation ASLoc, 1381 SourceLocation ColonLoc, 1382 AttributeList *Attrs) { 1383 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1384 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1385 ASLoc, ColonLoc); 1386 CurContext->addHiddenDecl(ASDecl); 1387 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1388} 1389 1390/// CheckOverrideControl - Check C++0x override control semantics. 1391void Sema::CheckOverrideControl(const Decl *D) { 1392 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1393 if (!MD || !MD->isVirtual()) 1394 return; 1395 1396 if (MD->isDependentContext()) 1397 return; 1398 1399 // C++0x [class.virtual]p3: 1400 // If a virtual function is marked with the virt-specifier override and does 1401 // not override a member function of a base class, 1402 // the program is ill-formed. 1403 bool HasOverriddenMethods = 1404 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1405 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1406 Diag(MD->getLocation(), 1407 diag::err_function_marked_override_not_overriding) 1408 << MD->getDeclName(); 1409 return; 1410 } 1411} 1412 1413/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1414/// function overrides a virtual member function marked 'final', according to 1415/// C++0x [class.virtual]p3. 1416bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1417 const CXXMethodDecl *Old) { 1418 if (!Old->hasAttr<FinalAttr>()) 1419 return false; 1420 1421 Diag(New->getLocation(), diag::err_final_function_overridden) 1422 << New->getDeclName(); 1423 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1424 return true; 1425} 1426 1427/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1428/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1429/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1430/// one has been parsed, and 'HasDeferredInit' is true if an initializer is 1431/// present but parsing it has been deferred. 1432Decl * 1433Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1434 MultiTemplateParamsArg TemplateParameterLists, 1435 Expr *BW, const VirtSpecifiers &VS, 1436 bool HasDeferredInit) { 1437 const DeclSpec &DS = D.getDeclSpec(); 1438 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1439 DeclarationName Name = NameInfo.getName(); 1440 SourceLocation Loc = NameInfo.getLoc(); 1441 1442 // For anonymous bitfields, the location should point to the type. 1443 if (Loc.isInvalid()) 1444 Loc = D.getSourceRange().getBegin(); 1445 1446 Expr *BitWidth = static_cast<Expr*>(BW); 1447 1448 assert(isa<CXXRecordDecl>(CurContext)); 1449 assert(!DS.isFriendSpecified()); 1450 1451 bool isFunc = D.isDeclarationOfFunction(); 1452 1453 // C++ 9.2p6: A member shall not be declared to have automatic storage 1454 // duration (auto, register) or with the extern storage-class-specifier. 1455 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1456 // data members and cannot be applied to names declared const or static, 1457 // and cannot be applied to reference members. 1458 switch (DS.getStorageClassSpec()) { 1459 case DeclSpec::SCS_unspecified: 1460 case DeclSpec::SCS_typedef: 1461 case DeclSpec::SCS_static: 1462 // FALL THROUGH. 1463 break; 1464 case DeclSpec::SCS_mutable: 1465 if (isFunc) { 1466 if (DS.getStorageClassSpecLoc().isValid()) 1467 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1468 else 1469 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1470 1471 // FIXME: It would be nicer if the keyword was ignored only for this 1472 // declarator. Otherwise we could get follow-up errors. 1473 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1474 } 1475 break; 1476 default: 1477 if (DS.getStorageClassSpecLoc().isValid()) 1478 Diag(DS.getStorageClassSpecLoc(), 1479 diag::err_storageclass_invalid_for_member); 1480 else 1481 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1482 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1483 } 1484 1485 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1486 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1487 !isFunc); 1488 1489 Decl *Member; 1490 if (isInstField) { 1491 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1492 1493 // Data members must have identifiers for names. 1494 if (Name.getNameKind() != DeclarationName::Identifier) { 1495 Diag(Loc, diag::err_bad_variable_name) 1496 << Name; 1497 return 0; 1498 } 1499 1500 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1501 1502 // Member field could not be with "template" keyword. 1503 // So TemplateParameterLists should be empty in this case. 1504 if (TemplateParameterLists.size()) { 1505 TemplateParameterList* TemplateParams = TemplateParameterLists.get()[0]; 1506 if (TemplateParams->size()) { 1507 // There is no such thing as a member field template. 1508 Diag(D.getIdentifierLoc(), diag::err_template_member) 1509 << II 1510 << SourceRange(TemplateParams->getTemplateLoc(), 1511 TemplateParams->getRAngleLoc()); 1512 } else { 1513 // There is an extraneous 'template<>' for this member. 1514 Diag(TemplateParams->getTemplateLoc(), 1515 diag::err_template_member_noparams) 1516 << II 1517 << SourceRange(TemplateParams->getTemplateLoc(), 1518 TemplateParams->getRAngleLoc()); 1519 } 1520 return 0; 1521 } 1522 1523 if (SS.isSet() && !SS.isInvalid()) { 1524 // The user provided a superfluous scope specifier inside a class 1525 // definition: 1526 // 1527 // class X { 1528 // int X::member; 1529 // }; 1530 DeclContext *DC = 0; 1531 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1532 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1533 << Name << FixItHint::CreateRemoval(SS.getRange()); 1534 else 1535 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1536 << Name << SS.getRange(); 1537 1538 SS.clear(); 1539 } 1540 1541 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1542 HasDeferredInit, AS); 1543 assert(Member && "HandleField never returns null"); 1544 } else { 1545 assert(!HasDeferredInit); 1546 1547 Member = HandleDeclarator(S, D, move(TemplateParameterLists)); 1548 if (!Member) { 1549 return 0; 1550 } 1551 1552 // Non-instance-fields can't have a bitfield. 1553 if (BitWidth) { 1554 if (Member->isInvalidDecl()) { 1555 // don't emit another diagnostic. 1556 } else if (isa<VarDecl>(Member)) { 1557 // C++ 9.6p3: A bit-field shall not be a static member. 1558 // "static member 'A' cannot be a bit-field" 1559 Diag(Loc, diag::err_static_not_bitfield) 1560 << Name << BitWidth->getSourceRange(); 1561 } else if (isa<TypedefDecl>(Member)) { 1562 // "typedef member 'x' cannot be a bit-field" 1563 Diag(Loc, diag::err_typedef_not_bitfield) 1564 << Name << BitWidth->getSourceRange(); 1565 } else { 1566 // A function typedef ("typedef int f(); f a;"). 1567 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1568 Diag(Loc, diag::err_not_integral_type_bitfield) 1569 << Name << cast<ValueDecl>(Member)->getType() 1570 << BitWidth->getSourceRange(); 1571 } 1572 1573 BitWidth = 0; 1574 Member->setInvalidDecl(); 1575 } 1576 1577 Member->setAccess(AS); 1578 1579 // If we have declared a member function template, set the access of the 1580 // templated declaration as well. 1581 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1582 FunTmpl->getTemplatedDecl()->setAccess(AS); 1583 } 1584 1585 if (VS.isOverrideSpecified()) { 1586 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1587 if (!MD || !MD->isVirtual()) { 1588 Diag(Member->getLocStart(), 1589 diag::override_keyword_only_allowed_on_virtual_member_functions) 1590 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1591 } else 1592 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1593 } 1594 if (VS.isFinalSpecified()) { 1595 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1596 if (!MD || !MD->isVirtual()) { 1597 Diag(Member->getLocStart(), 1598 diag::override_keyword_only_allowed_on_virtual_member_functions) 1599 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1600 } else 1601 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1602 } 1603 1604 if (VS.getLastLocation().isValid()) { 1605 // Update the end location of a method that has a virt-specifiers. 1606 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1607 MD->setRangeEnd(VS.getLastLocation()); 1608 } 1609 1610 CheckOverrideControl(Member); 1611 1612 assert((Name || isInstField) && "No identifier for non-field ?"); 1613 1614 if (isInstField) 1615 FieldCollector->Add(cast<FieldDecl>(Member)); 1616 return Member; 1617} 1618 1619/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1620/// in-class initializer for a non-static C++ class member, and after 1621/// instantiating an in-class initializer in a class template. Such actions 1622/// are deferred until the class is complete. 1623void 1624Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation EqualLoc, 1625 Expr *InitExpr) { 1626 FieldDecl *FD = cast<FieldDecl>(D); 1627 1628 if (!InitExpr) { 1629 FD->setInvalidDecl(); 1630 FD->removeInClassInitializer(); 1631 return; 1632 } 1633 1634 ExprResult Init = InitExpr; 1635 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1636 // FIXME: if there is no EqualLoc, this is list-initialization. 1637 Init = PerformCopyInitialization( 1638 InitializedEntity::InitializeMember(FD), EqualLoc, InitExpr); 1639 if (Init.isInvalid()) { 1640 FD->setInvalidDecl(); 1641 return; 1642 } 1643 1644 CheckImplicitConversions(Init.get(), EqualLoc); 1645 } 1646 1647 // C++0x [class.base.init]p7: 1648 // The initialization of each base and member constitutes a 1649 // full-expression. 1650 Init = MaybeCreateExprWithCleanups(Init); 1651 if (Init.isInvalid()) { 1652 FD->setInvalidDecl(); 1653 return; 1654 } 1655 1656 InitExpr = Init.release(); 1657 1658 FD->setInClassInitializer(InitExpr); 1659} 1660 1661/// \brief Find the direct and/or virtual base specifiers that 1662/// correspond to the given base type, for use in base initialization 1663/// within a constructor. 1664static bool FindBaseInitializer(Sema &SemaRef, 1665 CXXRecordDecl *ClassDecl, 1666 QualType BaseType, 1667 const CXXBaseSpecifier *&DirectBaseSpec, 1668 const CXXBaseSpecifier *&VirtualBaseSpec) { 1669 // First, check for a direct base class. 1670 DirectBaseSpec = 0; 1671 for (CXXRecordDecl::base_class_const_iterator Base 1672 = ClassDecl->bases_begin(); 1673 Base != ClassDecl->bases_end(); ++Base) { 1674 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1675 // We found a direct base of this type. That's what we're 1676 // initializing. 1677 DirectBaseSpec = &*Base; 1678 break; 1679 } 1680 } 1681 1682 // Check for a virtual base class. 1683 // FIXME: We might be able to short-circuit this if we know in advance that 1684 // there are no virtual bases. 1685 VirtualBaseSpec = 0; 1686 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1687 // We haven't found a base yet; search the class hierarchy for a 1688 // virtual base class. 1689 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1690 /*DetectVirtual=*/false); 1691 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1692 BaseType, Paths)) { 1693 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1694 Path != Paths.end(); ++Path) { 1695 if (Path->back().Base->isVirtual()) { 1696 VirtualBaseSpec = Path->back().Base; 1697 break; 1698 } 1699 } 1700 } 1701 } 1702 1703 return DirectBaseSpec || VirtualBaseSpec; 1704} 1705 1706/// \brief Handle a C++ member initializer using braced-init-list syntax. 1707MemInitResult 1708Sema::ActOnMemInitializer(Decl *ConstructorD, 1709 Scope *S, 1710 CXXScopeSpec &SS, 1711 IdentifierInfo *MemberOrBase, 1712 ParsedType TemplateTypeTy, 1713 SourceLocation IdLoc, 1714 Expr *InitList, 1715 SourceLocation EllipsisLoc) { 1716 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1717 IdLoc, MultiInitializer(InitList), EllipsisLoc); 1718} 1719 1720/// \brief Handle a C++ member initializer using parentheses syntax. 1721MemInitResult 1722Sema::ActOnMemInitializer(Decl *ConstructorD, 1723 Scope *S, 1724 CXXScopeSpec &SS, 1725 IdentifierInfo *MemberOrBase, 1726 ParsedType TemplateTypeTy, 1727 SourceLocation IdLoc, 1728 SourceLocation LParenLoc, 1729 Expr **Args, unsigned NumArgs, 1730 SourceLocation RParenLoc, 1731 SourceLocation EllipsisLoc) { 1732 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1733 IdLoc, MultiInitializer(LParenLoc, Args, NumArgs, 1734 RParenLoc), 1735 EllipsisLoc); 1736} 1737 1738/// \brief Handle a C++ member initializer. 1739MemInitResult 1740Sema::BuildMemInitializer(Decl *ConstructorD, 1741 Scope *S, 1742 CXXScopeSpec &SS, 1743 IdentifierInfo *MemberOrBase, 1744 ParsedType TemplateTypeTy, 1745 SourceLocation IdLoc, 1746 const MultiInitializer &Args, 1747 SourceLocation EllipsisLoc) { 1748 if (!ConstructorD) 1749 return true; 1750 1751 AdjustDeclIfTemplate(ConstructorD); 1752 1753 CXXConstructorDecl *Constructor 1754 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1755 if (!Constructor) { 1756 // The user wrote a constructor initializer on a function that is 1757 // not a C++ constructor. Ignore the error for now, because we may 1758 // have more member initializers coming; we'll diagnose it just 1759 // once in ActOnMemInitializers. 1760 return true; 1761 } 1762 1763 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1764 1765 // C++ [class.base.init]p2: 1766 // Names in a mem-initializer-id are looked up in the scope of the 1767 // constructor's class and, if not found in that scope, are looked 1768 // up in the scope containing the constructor's definition. 1769 // [Note: if the constructor's class contains a member with the 1770 // same name as a direct or virtual base class of the class, a 1771 // mem-initializer-id naming the member or base class and composed 1772 // of a single identifier refers to the class member. A 1773 // mem-initializer-id for the hidden base class may be specified 1774 // using a qualified name. ] 1775 if (!SS.getScopeRep() && !TemplateTypeTy) { 1776 // Look for a member, first. 1777 FieldDecl *Member = 0; 1778 DeclContext::lookup_result Result 1779 = ClassDecl->lookup(MemberOrBase); 1780 if (Result.first != Result.second) { 1781 Member = dyn_cast<FieldDecl>(*Result.first); 1782 1783 if (Member) { 1784 if (EllipsisLoc.isValid()) 1785 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1786 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1787 1788 return BuildMemberInitializer(Member, Args, IdLoc); 1789 } 1790 1791 // Handle anonymous union case. 1792 if (IndirectFieldDecl* IndirectField 1793 = dyn_cast<IndirectFieldDecl>(*Result.first)) { 1794 if (EllipsisLoc.isValid()) 1795 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1796 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1797 1798 return BuildMemberInitializer(IndirectField, Args, IdLoc); 1799 } 1800 } 1801 } 1802 // It didn't name a member, so see if it names a class. 1803 QualType BaseType; 1804 TypeSourceInfo *TInfo = 0; 1805 1806 if (TemplateTypeTy) { 1807 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1808 } else { 1809 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1810 LookupParsedName(R, S, &SS); 1811 1812 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1813 if (!TyD) { 1814 if (R.isAmbiguous()) return true; 1815 1816 // We don't want access-control diagnostics here. 1817 R.suppressDiagnostics(); 1818 1819 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1820 bool NotUnknownSpecialization = false; 1821 DeclContext *DC = computeDeclContext(SS, false); 1822 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1823 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1824 1825 if (!NotUnknownSpecialization) { 1826 // When the scope specifier can refer to a member of an unknown 1827 // specialization, we take it as a type name. 1828 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1829 SS.getWithLocInContext(Context), 1830 *MemberOrBase, IdLoc); 1831 if (BaseType.isNull()) 1832 return true; 1833 1834 R.clear(); 1835 R.setLookupName(MemberOrBase); 1836 } 1837 } 1838 1839 // If no results were found, try to correct typos. 1840 TypoCorrection Corr; 1841 if (R.empty() && BaseType.isNull() && 1842 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1843 ClassDecl, false, CTC_NoKeywords))) { 1844 std::string CorrectedStr(Corr.getAsString(getLangOptions())); 1845 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOptions())); 1846 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1847 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1848 // We have found a non-static data member with a similar 1849 // name to what was typed; complain and initialize that 1850 // member. 1851 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1852 << MemberOrBase << true << CorrectedQuotedStr 1853 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1854 Diag(Member->getLocation(), diag::note_previous_decl) 1855 << CorrectedQuotedStr; 1856 1857 return BuildMemberInitializer(Member, Args, IdLoc); 1858 } 1859 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1860 const CXXBaseSpecifier *DirectBaseSpec; 1861 const CXXBaseSpecifier *VirtualBaseSpec; 1862 if (FindBaseInitializer(*this, ClassDecl, 1863 Context.getTypeDeclType(Type), 1864 DirectBaseSpec, VirtualBaseSpec)) { 1865 // We have found a direct or virtual base class with a 1866 // similar name to what was typed; complain and initialize 1867 // that base class. 1868 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1869 << MemberOrBase << false << CorrectedQuotedStr 1870 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1871 1872 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1873 : VirtualBaseSpec; 1874 Diag(BaseSpec->getSourceRange().getBegin(), 1875 diag::note_base_class_specified_here) 1876 << BaseSpec->getType() 1877 << BaseSpec->getSourceRange(); 1878 1879 TyD = Type; 1880 } 1881 } 1882 } 1883 1884 if (!TyD && BaseType.isNull()) { 1885 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1886 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1887 return true; 1888 } 1889 } 1890 1891 if (BaseType.isNull()) { 1892 BaseType = Context.getTypeDeclType(TyD); 1893 if (SS.isSet()) { 1894 NestedNameSpecifier *Qualifier = 1895 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1896 1897 // FIXME: preserve source range information 1898 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1899 } 1900 } 1901 } 1902 1903 if (!TInfo) 1904 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1905 1906 return BuildBaseInitializer(BaseType, TInfo, Args, ClassDecl, EllipsisLoc); 1907} 1908 1909/// Checks a member initializer expression for cases where reference (or 1910/// pointer) members are bound to by-value parameters (or their addresses). 1911static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 1912 Expr *Init, 1913 SourceLocation IdLoc) { 1914 QualType MemberTy = Member->getType(); 1915 1916 // We only handle pointers and references currently. 1917 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 1918 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 1919 return; 1920 1921 const bool IsPointer = MemberTy->isPointerType(); 1922 if (IsPointer) { 1923 if (const UnaryOperator *Op 1924 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 1925 // The only case we're worried about with pointers requires taking the 1926 // address. 1927 if (Op->getOpcode() != UO_AddrOf) 1928 return; 1929 1930 Init = Op->getSubExpr(); 1931 } else { 1932 // We only handle address-of expression initializers for pointers. 1933 return; 1934 } 1935 } 1936 1937 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 1938 // Taking the address of a temporary will be diagnosed as a hard error. 1939 if (IsPointer) 1940 return; 1941 1942 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 1943 << Member << Init->getSourceRange(); 1944 } else if (const DeclRefExpr *DRE 1945 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 1946 // We only warn when referring to a non-reference parameter declaration. 1947 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 1948 if (!Parameter || Parameter->getType()->isReferenceType()) 1949 return; 1950 1951 S.Diag(Init->getExprLoc(), 1952 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 1953 : diag::warn_bind_ref_member_to_parameter) 1954 << Member << Parameter << Init->getSourceRange(); 1955 } else { 1956 // Other initializers are fine. 1957 return; 1958 } 1959 1960 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 1961 << (unsigned)IsPointer; 1962} 1963 1964/// Checks an initializer expression for use of uninitialized fields, such as 1965/// containing the field that is being initialized. Returns true if there is an 1966/// uninitialized field was used an updates the SourceLocation parameter; false 1967/// otherwise. 1968static bool InitExprContainsUninitializedFields(const Stmt *S, 1969 const ValueDecl *LhsField, 1970 SourceLocation *L) { 1971 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1972 1973 if (isa<CallExpr>(S)) { 1974 // Do not descend into function calls or constructors, as the use 1975 // of an uninitialized field may be valid. One would have to inspect 1976 // the contents of the function/ctor to determine if it is safe or not. 1977 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1978 // may be safe, depending on what the function/ctor does. 1979 return false; 1980 } 1981 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1982 const NamedDecl *RhsField = ME->getMemberDecl(); 1983 1984 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1985 // The member expression points to a static data member. 1986 assert(VD->isStaticDataMember() && 1987 "Member points to non-static data member!"); 1988 (void)VD; 1989 return false; 1990 } 1991 1992 if (isa<EnumConstantDecl>(RhsField)) { 1993 // The member expression points to an enum. 1994 return false; 1995 } 1996 1997 if (RhsField == LhsField) { 1998 // Initializing a field with itself. Throw a warning. 1999 // But wait; there are exceptions! 2000 // Exception #1: The field may not belong to this record. 2001 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 2002 const Expr *base = ME->getBase(); 2003 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 2004 // Even though the field matches, it does not belong to this record. 2005 return false; 2006 } 2007 // None of the exceptions triggered; return true to indicate an 2008 // uninitialized field was used. 2009 *L = ME->getMemberLoc(); 2010 return true; 2011 } 2012 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 2013 // sizeof/alignof doesn't reference contents, do not warn. 2014 return false; 2015 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 2016 // address-of doesn't reference contents (the pointer may be dereferenced 2017 // in the same expression but it would be rare; and weird). 2018 if (UOE->getOpcode() == UO_AddrOf) 2019 return false; 2020 } 2021 for (Stmt::const_child_range it = S->children(); it; ++it) { 2022 if (!*it) { 2023 // An expression such as 'member(arg ?: "")' may trigger this. 2024 continue; 2025 } 2026 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 2027 return true; 2028 } 2029 return false; 2030} 2031 2032MemInitResult 2033Sema::BuildMemberInitializer(ValueDecl *Member, 2034 const MultiInitializer &Args, 2035 SourceLocation IdLoc) { 2036 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2037 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2038 assert((DirectMember || IndirectMember) && 2039 "Member must be a FieldDecl or IndirectFieldDecl"); 2040 2041 if (Member->isInvalidDecl()) 2042 return true; 2043 2044 // Diagnose value-uses of fields to initialize themselves, e.g. 2045 // foo(foo) 2046 // where foo is not also a parameter to the constructor. 2047 // TODO: implement -Wuninitialized and fold this into that framework. 2048 for (MultiInitializer::iterator I = Args.begin(), E = Args.end(); 2049 I != E; ++I) { 2050 SourceLocation L; 2051 Expr *Arg = *I; 2052 if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Arg)) 2053 Arg = DIE->getInit(); 2054 if (InitExprContainsUninitializedFields(Arg, Member, &L)) { 2055 // FIXME: Return true in the case when other fields are used before being 2056 // uninitialized. For example, let this field be the i'th field. When 2057 // initializing the i'th field, throw a warning if any of the >= i'th 2058 // fields are used, as they are not yet initialized. 2059 // Right now we are only handling the case where the i'th field uses 2060 // itself in its initializer. 2061 Diag(L, diag::warn_field_is_uninit); 2062 } 2063 } 2064 2065 bool HasDependentArg = Args.isTypeDependent(); 2066 2067 Expr *Init; 2068 if (Member->getType()->isDependentType() || HasDependentArg) { 2069 // Can't check initialization for a member of dependent type or when 2070 // any of the arguments are type-dependent expressions. 2071 Init = Args.CreateInitExpr(Context,Member->getType().getNonReferenceType()); 2072 2073 DiscardCleanupsInEvaluationContext(); 2074 } else { 2075 // Initialize the member. 2076 InitializedEntity MemberEntity = 2077 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2078 : InitializedEntity::InitializeMember(IndirectMember, 0); 2079 InitializationKind Kind = 2080 InitializationKind::CreateDirect(IdLoc, Args.getStartLoc(), 2081 Args.getEndLoc()); 2082 2083 ExprResult MemberInit = Args.PerformInit(*this, MemberEntity, Kind); 2084 if (MemberInit.isInvalid()) 2085 return true; 2086 2087 CheckImplicitConversions(MemberInit.get(), Args.getStartLoc()); 2088 2089 // C++0x [class.base.init]p7: 2090 // The initialization of each base and member constitutes a 2091 // full-expression. 2092 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2093 if (MemberInit.isInvalid()) 2094 return true; 2095 2096 // If we are in a dependent context, template instantiation will 2097 // perform this type-checking again. Just save the arguments that we 2098 // received in a ParenListExpr. 2099 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2100 // of the information that we have about the member 2101 // initializer. However, deconstructing the ASTs is a dicey process, 2102 // and this approach is far more likely to get the corner cases right. 2103 if (CurContext->isDependentContext()) { 2104 Init = Args.CreateInitExpr(Context, 2105 Member->getType().getNonReferenceType()); 2106 } else { 2107 Init = MemberInit.get(); 2108 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2109 } 2110 } 2111 2112 if (DirectMember) { 2113 return new (Context) CXXCtorInitializer(Context, DirectMember, 2114 IdLoc, Args.getStartLoc(), 2115 Init, Args.getEndLoc()); 2116 } else { 2117 return new (Context) CXXCtorInitializer(Context, IndirectMember, 2118 IdLoc, Args.getStartLoc(), 2119 Init, Args.getEndLoc()); 2120 } 2121} 2122 2123MemInitResult 2124Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 2125 const MultiInitializer &Args, 2126 SourceLocation NameLoc, 2127 CXXRecordDecl *ClassDecl) { 2128 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2129 if (!LangOpts.CPlusPlus0x) 2130 return Diag(Loc, diag::err_delegation_0x_only) 2131 << TInfo->getTypeLoc().getLocalSourceRange(); 2132 2133 // Initialize the object. 2134 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2135 QualType(ClassDecl->getTypeForDecl(), 0)); 2136 InitializationKind Kind = 2137 InitializationKind::CreateDirect(NameLoc, Args.getStartLoc(), 2138 Args.getEndLoc()); 2139 2140 ExprResult DelegationInit = Args.PerformInit(*this, DelegationEntity, Kind); 2141 if (DelegationInit.isInvalid()) 2142 return true; 2143 2144 CXXConstructExpr *ConExpr = cast<CXXConstructExpr>(DelegationInit.get()); 2145 CXXConstructorDecl *Constructor 2146 = ConExpr->getConstructor(); 2147 assert(Constructor && "Delegating constructor with no target?"); 2148 2149 CheckImplicitConversions(DelegationInit.get(), Args.getStartLoc()); 2150 2151 // C++0x [class.base.init]p7: 2152 // The initialization of each base and member constitutes a 2153 // full-expression. 2154 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2155 if (DelegationInit.isInvalid()) 2156 return true; 2157 2158 assert(!CurContext->isDependentContext()); 2159 return new (Context) CXXCtorInitializer(Context, Loc, Args.getStartLoc(), 2160 Constructor, 2161 DelegationInit.takeAs<Expr>(), 2162 Args.getEndLoc()); 2163} 2164 2165MemInitResult 2166Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2167 const MultiInitializer &Args, 2168 CXXRecordDecl *ClassDecl, 2169 SourceLocation EllipsisLoc) { 2170 bool HasDependentArg = Args.isTypeDependent(); 2171 2172 SourceLocation BaseLoc 2173 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2174 2175 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2176 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2177 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2178 2179 // C++ [class.base.init]p2: 2180 // [...] Unless the mem-initializer-id names a nonstatic data 2181 // member of the constructor's class or a direct or virtual base 2182 // of that class, the mem-initializer is ill-formed. A 2183 // mem-initializer-list can initialize a base class using any 2184 // name that denotes that base class type. 2185 bool Dependent = BaseType->isDependentType() || HasDependentArg; 2186 2187 if (EllipsisLoc.isValid()) { 2188 // This is a pack expansion. 2189 if (!BaseType->containsUnexpandedParameterPack()) { 2190 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2191 << SourceRange(BaseLoc, Args.getEndLoc()); 2192 2193 EllipsisLoc = SourceLocation(); 2194 } 2195 } else { 2196 // Check for any unexpanded parameter packs. 2197 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2198 return true; 2199 2200 if (Args.DiagnoseUnexpandedParameterPack(*this)) 2201 return true; 2202 } 2203 2204 // Check for direct and virtual base classes. 2205 const CXXBaseSpecifier *DirectBaseSpec = 0; 2206 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2207 if (!Dependent) { 2208 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2209 BaseType)) 2210 return BuildDelegatingInitializer(BaseTInfo, Args, BaseLoc, ClassDecl); 2211 2212 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2213 VirtualBaseSpec); 2214 2215 // C++ [base.class.init]p2: 2216 // Unless the mem-initializer-id names a nonstatic data member of the 2217 // constructor's class or a direct or virtual base of that class, the 2218 // mem-initializer is ill-formed. 2219 if (!DirectBaseSpec && !VirtualBaseSpec) { 2220 // If the class has any dependent bases, then it's possible that 2221 // one of those types will resolve to the same type as 2222 // BaseType. Therefore, just treat this as a dependent base 2223 // class initialization. FIXME: Should we try to check the 2224 // initialization anyway? It seems odd. 2225 if (ClassDecl->hasAnyDependentBases()) 2226 Dependent = true; 2227 else 2228 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2229 << BaseType << Context.getTypeDeclType(ClassDecl) 2230 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2231 } 2232 } 2233 2234 if (Dependent) { 2235 // Can't check initialization for a base of dependent type or when 2236 // any of the arguments are type-dependent expressions. 2237 Expr *BaseInit = Args.CreateInitExpr(Context, BaseType); 2238 2239 DiscardCleanupsInEvaluationContext(); 2240 2241 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2242 /*IsVirtual=*/false, 2243 Args.getStartLoc(), BaseInit, 2244 Args.getEndLoc(), EllipsisLoc); 2245 } 2246 2247 // C++ [base.class.init]p2: 2248 // If a mem-initializer-id is ambiguous because it designates both 2249 // a direct non-virtual base class and an inherited virtual base 2250 // class, the mem-initializer is ill-formed. 2251 if (DirectBaseSpec && VirtualBaseSpec) 2252 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2253 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2254 2255 CXXBaseSpecifier *BaseSpec 2256 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2257 if (!BaseSpec) 2258 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2259 2260 // Initialize the base. 2261 InitializedEntity BaseEntity = 2262 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2263 InitializationKind Kind = 2264 InitializationKind::CreateDirect(BaseLoc, Args.getStartLoc(), 2265 Args.getEndLoc()); 2266 2267 ExprResult BaseInit = Args.PerformInit(*this, BaseEntity, Kind); 2268 if (BaseInit.isInvalid()) 2269 return true; 2270 2271 CheckImplicitConversions(BaseInit.get(), Args.getStartLoc()); 2272 2273 // C++0x [class.base.init]p7: 2274 // The initialization of each base and member constitutes a 2275 // full-expression. 2276 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2277 if (BaseInit.isInvalid()) 2278 return true; 2279 2280 // If we are in a dependent context, template instantiation will 2281 // perform this type-checking again. Just save the arguments that we 2282 // received in a ParenListExpr. 2283 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2284 // of the information that we have about the base 2285 // initializer. However, deconstructing the ASTs is a dicey process, 2286 // and this approach is far more likely to get the corner cases right. 2287 if (CurContext->isDependentContext()) 2288 BaseInit = Owned(Args.CreateInitExpr(Context, BaseType)); 2289 2290 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2291 BaseSpec->isVirtual(), 2292 Args.getStartLoc(), 2293 BaseInit.takeAs<Expr>(), 2294 Args.getEndLoc(), EllipsisLoc); 2295} 2296 2297// Create a static_cast\<T&&>(expr). 2298static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2299 QualType ExprType = E->getType(); 2300 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2301 SourceLocation ExprLoc = E->getLocStart(); 2302 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2303 TargetType, ExprLoc); 2304 2305 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2306 SourceRange(ExprLoc, ExprLoc), 2307 E->getSourceRange()).take(); 2308} 2309 2310/// ImplicitInitializerKind - How an implicit base or member initializer should 2311/// initialize its base or member. 2312enum ImplicitInitializerKind { 2313 IIK_Default, 2314 IIK_Copy, 2315 IIK_Move 2316}; 2317 2318static bool 2319BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2320 ImplicitInitializerKind ImplicitInitKind, 2321 CXXBaseSpecifier *BaseSpec, 2322 bool IsInheritedVirtualBase, 2323 CXXCtorInitializer *&CXXBaseInit) { 2324 InitializedEntity InitEntity 2325 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2326 IsInheritedVirtualBase); 2327 2328 ExprResult BaseInit; 2329 2330 switch (ImplicitInitKind) { 2331 case IIK_Default: { 2332 InitializationKind InitKind 2333 = InitializationKind::CreateDefault(Constructor->getLocation()); 2334 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2335 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2336 MultiExprArg(SemaRef, 0, 0)); 2337 break; 2338 } 2339 2340 case IIK_Move: 2341 case IIK_Copy: { 2342 bool Moving = ImplicitInitKind == IIK_Move; 2343 ParmVarDecl *Param = Constructor->getParamDecl(0); 2344 QualType ParamType = Param->getType().getNonReferenceType(); 2345 2346 Expr *CopyCtorArg = 2347 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 2348 Constructor->getLocation(), ParamType, 2349 VK_LValue, 0); 2350 2351 // Cast to the base class to avoid ambiguities. 2352 QualType ArgTy = 2353 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2354 ParamType.getQualifiers()); 2355 2356 if (Moving) { 2357 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2358 } 2359 2360 CXXCastPath BasePath; 2361 BasePath.push_back(BaseSpec); 2362 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2363 CK_UncheckedDerivedToBase, 2364 Moving ? VK_XValue : VK_LValue, 2365 &BasePath).take(); 2366 2367 InitializationKind InitKind 2368 = InitializationKind::CreateDirect(Constructor->getLocation(), 2369 SourceLocation(), SourceLocation()); 2370 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2371 &CopyCtorArg, 1); 2372 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2373 MultiExprArg(&CopyCtorArg, 1)); 2374 break; 2375 } 2376 } 2377 2378 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2379 if (BaseInit.isInvalid()) 2380 return true; 2381 2382 CXXBaseInit = 2383 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2384 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2385 SourceLocation()), 2386 BaseSpec->isVirtual(), 2387 SourceLocation(), 2388 BaseInit.takeAs<Expr>(), 2389 SourceLocation(), 2390 SourceLocation()); 2391 2392 return false; 2393} 2394 2395static bool RefersToRValueRef(Expr *MemRef) { 2396 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2397 return Referenced->getType()->isRValueReferenceType(); 2398} 2399 2400static bool 2401BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2402 ImplicitInitializerKind ImplicitInitKind, 2403 FieldDecl *Field, IndirectFieldDecl *Indirect, 2404 CXXCtorInitializer *&CXXMemberInit) { 2405 if (Field->isInvalidDecl()) 2406 return true; 2407 2408 SourceLocation Loc = Constructor->getLocation(); 2409 2410 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2411 bool Moving = ImplicitInitKind == IIK_Move; 2412 ParmVarDecl *Param = Constructor->getParamDecl(0); 2413 QualType ParamType = Param->getType().getNonReferenceType(); 2414 2415 // Suppress copying zero-width bitfields. 2416 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2417 return false; 2418 2419 Expr *MemberExprBase = 2420 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 2421 Loc, ParamType, VK_LValue, 0); 2422 2423 if (Moving) { 2424 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2425 } 2426 2427 // Build a reference to this field within the parameter. 2428 CXXScopeSpec SS; 2429 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2430 Sema::LookupMemberName); 2431 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2432 : cast<ValueDecl>(Field), AS_public); 2433 MemberLookup.resolveKind(); 2434 ExprResult CtorArg 2435 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2436 ParamType, Loc, 2437 /*IsArrow=*/false, 2438 SS, 2439 /*FirstQualifierInScope=*/0, 2440 MemberLookup, 2441 /*TemplateArgs=*/0); 2442 if (CtorArg.isInvalid()) 2443 return true; 2444 2445 // C++11 [class.copy]p15: 2446 // - if a member m has rvalue reference type T&&, it is direct-initialized 2447 // with static_cast<T&&>(x.m); 2448 if (RefersToRValueRef(CtorArg.get())) { 2449 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2450 } 2451 2452 // When the field we are copying is an array, create index variables for 2453 // each dimension of the array. We use these index variables to subscript 2454 // the source array, and other clients (e.g., CodeGen) will perform the 2455 // necessary iteration with these index variables. 2456 SmallVector<VarDecl *, 4> IndexVariables; 2457 QualType BaseType = Field->getType(); 2458 QualType SizeType = SemaRef.Context.getSizeType(); 2459 bool InitializingArray = false; 2460 while (const ConstantArrayType *Array 2461 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2462 InitializingArray = true; 2463 // Create the iteration variable for this array index. 2464 IdentifierInfo *IterationVarName = 0; 2465 { 2466 llvm::SmallString<8> Str; 2467 llvm::raw_svector_ostream OS(Str); 2468 OS << "__i" << IndexVariables.size(); 2469 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2470 } 2471 VarDecl *IterationVar 2472 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2473 IterationVarName, SizeType, 2474 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2475 SC_None, SC_None); 2476 IndexVariables.push_back(IterationVar); 2477 2478 // Create a reference to the iteration variable. 2479 ExprResult IterationVarRef 2480 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 2481 assert(!IterationVarRef.isInvalid() && 2482 "Reference to invented variable cannot fail!"); 2483 2484 // Subscript the array with this iteration variable. 2485 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2486 IterationVarRef.take(), 2487 Loc); 2488 if (CtorArg.isInvalid()) 2489 return true; 2490 2491 BaseType = Array->getElementType(); 2492 } 2493 2494 // The array subscript expression is an lvalue, which is wrong for moving. 2495 if (Moving && InitializingArray) 2496 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2497 2498 // Construct the entity that we will be initializing. For an array, this 2499 // will be first element in the array, which may require several levels 2500 // of array-subscript entities. 2501 SmallVector<InitializedEntity, 4> Entities; 2502 Entities.reserve(1 + IndexVariables.size()); 2503 if (Indirect) 2504 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2505 else 2506 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2507 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2508 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2509 0, 2510 Entities.back())); 2511 2512 // Direct-initialize to use the copy constructor. 2513 InitializationKind InitKind = 2514 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2515 2516 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2517 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2518 &CtorArgE, 1); 2519 2520 ExprResult MemberInit 2521 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2522 MultiExprArg(&CtorArgE, 1)); 2523 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2524 if (MemberInit.isInvalid()) 2525 return true; 2526 2527 if (Indirect) { 2528 assert(IndexVariables.size() == 0 && 2529 "Indirect field improperly initialized"); 2530 CXXMemberInit 2531 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2532 Loc, Loc, 2533 MemberInit.takeAs<Expr>(), 2534 Loc); 2535 } else 2536 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2537 Loc, MemberInit.takeAs<Expr>(), 2538 Loc, 2539 IndexVariables.data(), 2540 IndexVariables.size()); 2541 return false; 2542 } 2543 2544 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2545 2546 QualType FieldBaseElementType = 2547 SemaRef.Context.getBaseElementType(Field->getType()); 2548 2549 if (FieldBaseElementType->isRecordType()) { 2550 InitializedEntity InitEntity 2551 = Indirect? InitializedEntity::InitializeMember(Indirect) 2552 : InitializedEntity::InitializeMember(Field); 2553 InitializationKind InitKind = 2554 InitializationKind::CreateDefault(Loc); 2555 2556 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2557 ExprResult MemberInit = 2558 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2559 2560 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2561 if (MemberInit.isInvalid()) 2562 return true; 2563 2564 if (Indirect) 2565 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2566 Indirect, Loc, 2567 Loc, 2568 MemberInit.get(), 2569 Loc); 2570 else 2571 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2572 Field, Loc, Loc, 2573 MemberInit.get(), 2574 Loc); 2575 return false; 2576 } 2577 2578 if (!Field->getParent()->isUnion()) { 2579 if (FieldBaseElementType->isReferenceType()) { 2580 SemaRef.Diag(Constructor->getLocation(), 2581 diag::err_uninitialized_member_in_ctor) 2582 << (int)Constructor->isImplicit() 2583 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2584 << 0 << Field->getDeclName(); 2585 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2586 return true; 2587 } 2588 2589 if (FieldBaseElementType.isConstQualified()) { 2590 SemaRef.Diag(Constructor->getLocation(), 2591 diag::err_uninitialized_member_in_ctor) 2592 << (int)Constructor->isImplicit() 2593 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2594 << 1 << Field->getDeclName(); 2595 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2596 return true; 2597 } 2598 } 2599 2600 if (SemaRef.getLangOptions().ObjCAutoRefCount && 2601 FieldBaseElementType->isObjCRetainableType() && 2602 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2603 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2604 // Instant objects: 2605 // Default-initialize Objective-C pointers to NULL. 2606 CXXMemberInit 2607 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2608 Loc, Loc, 2609 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2610 Loc); 2611 return false; 2612 } 2613 2614 // Nothing to initialize. 2615 CXXMemberInit = 0; 2616 return false; 2617} 2618 2619namespace { 2620struct BaseAndFieldInfo { 2621 Sema &S; 2622 CXXConstructorDecl *Ctor; 2623 bool AnyErrorsInInits; 2624 ImplicitInitializerKind IIK; 2625 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2626 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2627 2628 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2629 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2630 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2631 if (Generated && Ctor->isCopyConstructor()) 2632 IIK = IIK_Copy; 2633 else if (Generated && Ctor->isMoveConstructor()) 2634 IIK = IIK_Move; 2635 else 2636 IIK = IIK_Default; 2637 } 2638}; 2639} 2640 2641/// \brief Determine whether the given indirect field declaration is somewhere 2642/// within an anonymous union. 2643static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2644 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2645 CEnd = F->chain_end(); 2646 C != CEnd; ++C) 2647 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2648 if (Record->isUnion()) 2649 return true; 2650 2651 return false; 2652} 2653 2654static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2655 FieldDecl *Field, 2656 IndirectFieldDecl *Indirect = 0) { 2657 2658 // Overwhelmingly common case: we have a direct initializer for this field. 2659 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2660 Info.AllToInit.push_back(Init); 2661 return false; 2662 } 2663 2664 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2665 // has a brace-or-equal-initializer, the entity is initialized as specified 2666 // in [dcl.init]. 2667 if (Field->hasInClassInitializer()) { 2668 CXXCtorInitializer *Init; 2669 if (Indirect) 2670 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2671 SourceLocation(), 2672 SourceLocation(), 0, 2673 SourceLocation()); 2674 else 2675 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2676 SourceLocation(), 2677 SourceLocation(), 0, 2678 SourceLocation()); 2679 Info.AllToInit.push_back(Init); 2680 return false; 2681 } 2682 2683 // Don't build an implicit initializer for union members if none was 2684 // explicitly specified. 2685 if (Field->getParent()->isUnion() || 2686 (Indirect && isWithinAnonymousUnion(Indirect))) 2687 return false; 2688 2689 // Don't try to build an implicit initializer if there were semantic 2690 // errors in any of the initializers (and therefore we might be 2691 // missing some that the user actually wrote). 2692 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2693 return false; 2694 2695 CXXCtorInitializer *Init = 0; 2696 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2697 Indirect, Init)) 2698 return true; 2699 2700 if (Init) 2701 Info.AllToInit.push_back(Init); 2702 2703 return false; 2704} 2705 2706bool 2707Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2708 CXXCtorInitializer *Initializer) { 2709 assert(Initializer->isDelegatingInitializer()); 2710 Constructor->setNumCtorInitializers(1); 2711 CXXCtorInitializer **initializer = 2712 new (Context) CXXCtorInitializer*[1]; 2713 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2714 Constructor->setCtorInitializers(initializer); 2715 2716 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2717 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2718 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2719 } 2720 2721 DelegatingCtorDecls.push_back(Constructor); 2722 2723 return false; 2724} 2725 2726bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2727 CXXCtorInitializer **Initializers, 2728 unsigned NumInitializers, 2729 bool AnyErrors) { 2730 if (Constructor->isDependentContext()) { 2731 // Just store the initializers as written, they will be checked during 2732 // instantiation. 2733 if (NumInitializers > 0) { 2734 Constructor->setNumCtorInitializers(NumInitializers); 2735 CXXCtorInitializer **baseOrMemberInitializers = 2736 new (Context) CXXCtorInitializer*[NumInitializers]; 2737 memcpy(baseOrMemberInitializers, Initializers, 2738 NumInitializers * sizeof(CXXCtorInitializer*)); 2739 Constructor->setCtorInitializers(baseOrMemberInitializers); 2740 } 2741 2742 return false; 2743 } 2744 2745 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2746 2747 // We need to build the initializer AST according to order of construction 2748 // and not what user specified in the Initializers list. 2749 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2750 if (!ClassDecl) 2751 return true; 2752 2753 bool HadError = false; 2754 2755 for (unsigned i = 0; i < NumInitializers; i++) { 2756 CXXCtorInitializer *Member = Initializers[i]; 2757 2758 if (Member->isBaseInitializer()) 2759 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2760 else 2761 Info.AllBaseFields[Member->getAnyMember()] = Member; 2762 } 2763 2764 // Keep track of the direct virtual bases. 2765 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2766 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2767 E = ClassDecl->bases_end(); I != E; ++I) { 2768 if (I->isVirtual()) 2769 DirectVBases.insert(I); 2770 } 2771 2772 // Push virtual bases before others. 2773 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2774 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2775 2776 if (CXXCtorInitializer *Value 2777 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2778 Info.AllToInit.push_back(Value); 2779 } else if (!AnyErrors) { 2780 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2781 CXXCtorInitializer *CXXBaseInit; 2782 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2783 VBase, IsInheritedVirtualBase, 2784 CXXBaseInit)) { 2785 HadError = true; 2786 continue; 2787 } 2788 2789 Info.AllToInit.push_back(CXXBaseInit); 2790 } 2791 } 2792 2793 // Non-virtual bases. 2794 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2795 E = ClassDecl->bases_end(); Base != E; ++Base) { 2796 // Virtuals are in the virtual base list and already constructed. 2797 if (Base->isVirtual()) 2798 continue; 2799 2800 if (CXXCtorInitializer *Value 2801 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2802 Info.AllToInit.push_back(Value); 2803 } else if (!AnyErrors) { 2804 CXXCtorInitializer *CXXBaseInit; 2805 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2806 Base, /*IsInheritedVirtualBase=*/false, 2807 CXXBaseInit)) { 2808 HadError = true; 2809 continue; 2810 } 2811 2812 Info.AllToInit.push_back(CXXBaseInit); 2813 } 2814 } 2815 2816 // Fields. 2817 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 2818 MemEnd = ClassDecl->decls_end(); 2819 Mem != MemEnd; ++Mem) { 2820 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 2821 // C++ [class.bit]p2: 2822 // A declaration for a bit-field that omits the identifier declares an 2823 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 2824 // initialized. 2825 if (F->isUnnamedBitfield()) 2826 continue; 2827 2828 if (F->getType()->isIncompleteArrayType()) { 2829 assert(ClassDecl->hasFlexibleArrayMember() && 2830 "Incomplete array type is not valid"); 2831 continue; 2832 } 2833 2834 // If we're not generating the implicit copy/move constructor, then we'll 2835 // handle anonymous struct/union fields based on their individual 2836 // indirect fields. 2837 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 2838 continue; 2839 2840 if (CollectFieldInitializer(*this, Info, F)) 2841 HadError = true; 2842 continue; 2843 } 2844 2845 // Beyond this point, we only consider default initialization. 2846 if (Info.IIK != IIK_Default) 2847 continue; 2848 2849 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 2850 if (F->getType()->isIncompleteArrayType()) { 2851 assert(ClassDecl->hasFlexibleArrayMember() && 2852 "Incomplete array type is not valid"); 2853 continue; 2854 } 2855 2856 // Initialize each field of an anonymous struct individually. 2857 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 2858 HadError = true; 2859 2860 continue; 2861 } 2862 } 2863 2864 NumInitializers = Info.AllToInit.size(); 2865 if (NumInitializers > 0) { 2866 Constructor->setNumCtorInitializers(NumInitializers); 2867 CXXCtorInitializer **baseOrMemberInitializers = 2868 new (Context) CXXCtorInitializer*[NumInitializers]; 2869 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2870 NumInitializers * sizeof(CXXCtorInitializer*)); 2871 Constructor->setCtorInitializers(baseOrMemberInitializers); 2872 2873 // Constructors implicitly reference the base and member 2874 // destructors. 2875 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2876 Constructor->getParent()); 2877 } 2878 2879 return HadError; 2880} 2881 2882static void *GetKeyForTopLevelField(FieldDecl *Field) { 2883 // For anonymous unions, use the class declaration as the key. 2884 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2885 if (RT->getDecl()->isAnonymousStructOrUnion()) 2886 return static_cast<void *>(RT->getDecl()); 2887 } 2888 return static_cast<void *>(Field); 2889} 2890 2891static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2892 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2893} 2894 2895static void *GetKeyForMember(ASTContext &Context, 2896 CXXCtorInitializer *Member) { 2897 if (!Member->isAnyMemberInitializer()) 2898 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2899 2900 // For fields injected into the class via declaration of an anonymous union, 2901 // use its anonymous union class declaration as the unique key. 2902 FieldDecl *Field = Member->getAnyMember(); 2903 2904 // If the field is a member of an anonymous struct or union, our key 2905 // is the anonymous record decl that's a direct child of the class. 2906 RecordDecl *RD = Field->getParent(); 2907 if (RD->isAnonymousStructOrUnion()) { 2908 while (true) { 2909 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2910 if (Parent->isAnonymousStructOrUnion()) 2911 RD = Parent; 2912 else 2913 break; 2914 } 2915 2916 return static_cast<void *>(RD); 2917 } 2918 2919 return static_cast<void *>(Field); 2920} 2921 2922static void 2923DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2924 const CXXConstructorDecl *Constructor, 2925 CXXCtorInitializer **Inits, 2926 unsigned NumInits) { 2927 if (Constructor->getDeclContext()->isDependentContext()) 2928 return; 2929 2930 // Don't check initializers order unless the warning is enabled at the 2931 // location of at least one initializer. 2932 bool ShouldCheckOrder = false; 2933 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2934 CXXCtorInitializer *Init = Inits[InitIndex]; 2935 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2936 Init->getSourceLocation()) 2937 != DiagnosticsEngine::Ignored) { 2938 ShouldCheckOrder = true; 2939 break; 2940 } 2941 } 2942 if (!ShouldCheckOrder) 2943 return; 2944 2945 // Build the list of bases and members in the order that they'll 2946 // actually be initialized. The explicit initializers should be in 2947 // this same order but may be missing things. 2948 SmallVector<const void*, 32> IdealInitKeys; 2949 2950 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2951 2952 // 1. Virtual bases. 2953 for (CXXRecordDecl::base_class_const_iterator VBase = 2954 ClassDecl->vbases_begin(), 2955 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2956 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2957 2958 // 2. Non-virtual bases. 2959 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2960 E = ClassDecl->bases_end(); Base != E; ++Base) { 2961 if (Base->isVirtual()) 2962 continue; 2963 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2964 } 2965 2966 // 3. Direct fields. 2967 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2968 E = ClassDecl->field_end(); Field != E; ++Field) { 2969 if (Field->isUnnamedBitfield()) 2970 continue; 2971 2972 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2973 } 2974 2975 unsigned NumIdealInits = IdealInitKeys.size(); 2976 unsigned IdealIndex = 0; 2977 2978 CXXCtorInitializer *PrevInit = 0; 2979 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2980 CXXCtorInitializer *Init = Inits[InitIndex]; 2981 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2982 2983 // Scan forward to try to find this initializer in the idealized 2984 // initializers list. 2985 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2986 if (InitKey == IdealInitKeys[IdealIndex]) 2987 break; 2988 2989 // If we didn't find this initializer, it must be because we 2990 // scanned past it on a previous iteration. That can only 2991 // happen if we're out of order; emit a warning. 2992 if (IdealIndex == NumIdealInits && PrevInit) { 2993 Sema::SemaDiagnosticBuilder D = 2994 SemaRef.Diag(PrevInit->getSourceLocation(), 2995 diag::warn_initializer_out_of_order); 2996 2997 if (PrevInit->isAnyMemberInitializer()) 2998 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2999 else 3000 D << 1 << PrevInit->getBaseClassInfo()->getType(); 3001 3002 if (Init->isAnyMemberInitializer()) 3003 D << 0 << Init->getAnyMember()->getDeclName(); 3004 else 3005 D << 1 << Init->getBaseClassInfo()->getType(); 3006 3007 // Move back to the initializer's location in the ideal list. 3008 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3009 if (InitKey == IdealInitKeys[IdealIndex]) 3010 break; 3011 3012 assert(IdealIndex != NumIdealInits && 3013 "initializer not found in initializer list"); 3014 } 3015 3016 PrevInit = Init; 3017 } 3018} 3019 3020namespace { 3021bool CheckRedundantInit(Sema &S, 3022 CXXCtorInitializer *Init, 3023 CXXCtorInitializer *&PrevInit) { 3024 if (!PrevInit) { 3025 PrevInit = Init; 3026 return false; 3027 } 3028 3029 if (FieldDecl *Field = Init->getMember()) 3030 S.Diag(Init->getSourceLocation(), 3031 diag::err_multiple_mem_initialization) 3032 << Field->getDeclName() 3033 << Init->getSourceRange(); 3034 else { 3035 const Type *BaseClass = Init->getBaseClass(); 3036 assert(BaseClass && "neither field nor base"); 3037 S.Diag(Init->getSourceLocation(), 3038 diag::err_multiple_base_initialization) 3039 << QualType(BaseClass, 0) 3040 << Init->getSourceRange(); 3041 } 3042 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3043 << 0 << PrevInit->getSourceRange(); 3044 3045 return true; 3046} 3047 3048typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3049typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3050 3051bool CheckRedundantUnionInit(Sema &S, 3052 CXXCtorInitializer *Init, 3053 RedundantUnionMap &Unions) { 3054 FieldDecl *Field = Init->getAnyMember(); 3055 RecordDecl *Parent = Field->getParent(); 3056 if (!Parent->isAnonymousStructOrUnion()) 3057 return false; 3058 3059 NamedDecl *Child = Field; 3060 do { 3061 if (Parent->isUnion()) { 3062 UnionEntry &En = Unions[Parent]; 3063 if (En.first && En.first != Child) { 3064 S.Diag(Init->getSourceLocation(), 3065 diag::err_multiple_mem_union_initialization) 3066 << Field->getDeclName() 3067 << Init->getSourceRange(); 3068 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3069 << 0 << En.second->getSourceRange(); 3070 return true; 3071 } else if (!En.first) { 3072 En.first = Child; 3073 En.second = Init; 3074 } 3075 } 3076 3077 Child = Parent; 3078 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3079 } while (Parent->isAnonymousStructOrUnion()); 3080 3081 return false; 3082} 3083} 3084 3085/// ActOnMemInitializers - Handle the member initializers for a constructor. 3086void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3087 SourceLocation ColonLoc, 3088 CXXCtorInitializer **meminits, 3089 unsigned NumMemInits, 3090 bool AnyErrors) { 3091 if (!ConstructorDecl) 3092 return; 3093 3094 AdjustDeclIfTemplate(ConstructorDecl); 3095 3096 CXXConstructorDecl *Constructor 3097 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3098 3099 if (!Constructor) { 3100 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3101 return; 3102 } 3103 3104 CXXCtorInitializer **MemInits = 3105 reinterpret_cast<CXXCtorInitializer **>(meminits); 3106 3107 // Mapping for the duplicate initializers check. 3108 // For member initializers, this is keyed with a FieldDecl*. 3109 // For base initializers, this is keyed with a Type*. 3110 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3111 3112 // Mapping for the inconsistent anonymous-union initializers check. 3113 RedundantUnionMap MemberUnions; 3114 3115 bool HadError = false; 3116 for (unsigned i = 0; i < NumMemInits; i++) { 3117 CXXCtorInitializer *Init = MemInits[i]; 3118 3119 // Set the source order index. 3120 Init->setSourceOrder(i); 3121 3122 if (Init->isAnyMemberInitializer()) { 3123 FieldDecl *Field = Init->getAnyMember(); 3124 if (CheckRedundantInit(*this, Init, Members[Field]) || 3125 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3126 HadError = true; 3127 } else if (Init->isBaseInitializer()) { 3128 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3129 if (CheckRedundantInit(*this, Init, Members[Key])) 3130 HadError = true; 3131 } else { 3132 assert(Init->isDelegatingInitializer()); 3133 // This must be the only initializer 3134 if (i != 0 || NumMemInits > 1) { 3135 Diag(MemInits[0]->getSourceLocation(), 3136 diag::err_delegating_initializer_alone) 3137 << MemInits[0]->getSourceRange(); 3138 HadError = true; 3139 // We will treat this as being the only initializer. 3140 } 3141 SetDelegatingInitializer(Constructor, MemInits[i]); 3142 // Return immediately as the initializer is set. 3143 return; 3144 } 3145 } 3146 3147 if (HadError) 3148 return; 3149 3150 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3151 3152 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3153} 3154 3155void 3156Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3157 CXXRecordDecl *ClassDecl) { 3158 // Ignore dependent contexts. Also ignore unions, since their members never 3159 // have destructors implicitly called. 3160 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3161 return; 3162 3163 // FIXME: all the access-control diagnostics are positioned on the 3164 // field/base declaration. That's probably good; that said, the 3165 // user might reasonably want to know why the destructor is being 3166 // emitted, and we currently don't say. 3167 3168 // Non-static data members. 3169 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3170 E = ClassDecl->field_end(); I != E; ++I) { 3171 FieldDecl *Field = *I; 3172 if (Field->isInvalidDecl()) 3173 continue; 3174 QualType FieldType = Context.getBaseElementType(Field->getType()); 3175 3176 const RecordType* RT = FieldType->getAs<RecordType>(); 3177 if (!RT) 3178 continue; 3179 3180 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3181 if (FieldClassDecl->isInvalidDecl()) 3182 continue; 3183 if (FieldClassDecl->hasTrivialDestructor()) 3184 continue; 3185 3186 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3187 assert(Dtor && "No dtor found for FieldClassDecl!"); 3188 CheckDestructorAccess(Field->getLocation(), Dtor, 3189 PDiag(diag::err_access_dtor_field) 3190 << Field->getDeclName() 3191 << FieldType); 3192 3193 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3194 } 3195 3196 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3197 3198 // Bases. 3199 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3200 E = ClassDecl->bases_end(); Base != E; ++Base) { 3201 // Bases are always records in a well-formed non-dependent class. 3202 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3203 3204 // Remember direct virtual bases. 3205 if (Base->isVirtual()) 3206 DirectVirtualBases.insert(RT); 3207 3208 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3209 // If our base class is invalid, we probably can't get its dtor anyway. 3210 if (BaseClassDecl->isInvalidDecl()) 3211 continue; 3212 // Ignore trivial destructors. 3213 if (BaseClassDecl->hasTrivialDestructor()) 3214 continue; 3215 3216 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3217 assert(Dtor && "No dtor found for BaseClassDecl!"); 3218 3219 // FIXME: caret should be on the start of the class name 3220 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 3221 PDiag(diag::err_access_dtor_base) 3222 << Base->getType() 3223 << Base->getSourceRange()); 3224 3225 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3226 } 3227 3228 // Virtual bases. 3229 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3230 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3231 3232 // Bases are always records in a well-formed non-dependent class. 3233 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 3234 3235 // Ignore direct virtual bases. 3236 if (DirectVirtualBases.count(RT)) 3237 continue; 3238 3239 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3240 // If our base class is invalid, we probably can't get its dtor anyway. 3241 if (BaseClassDecl->isInvalidDecl()) 3242 continue; 3243 // Ignore trivial destructors. 3244 if (BaseClassDecl->hasTrivialDestructor()) 3245 continue; 3246 3247 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3248 assert(Dtor && "No dtor found for BaseClassDecl!"); 3249 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3250 PDiag(diag::err_access_dtor_vbase) 3251 << VBase->getType()); 3252 3253 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3254 } 3255} 3256 3257void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3258 if (!CDtorDecl) 3259 return; 3260 3261 if (CXXConstructorDecl *Constructor 3262 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3263 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3264} 3265 3266bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3267 unsigned DiagID, AbstractDiagSelID SelID) { 3268 if (SelID == -1) 3269 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 3270 else 3271 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 3272} 3273 3274bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3275 const PartialDiagnostic &PD) { 3276 if (!getLangOptions().CPlusPlus) 3277 return false; 3278 3279 if (const ArrayType *AT = Context.getAsArrayType(T)) 3280 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3281 3282 if (const PointerType *PT = T->getAs<PointerType>()) { 3283 // Find the innermost pointer type. 3284 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3285 PT = T; 3286 3287 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3288 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3289 } 3290 3291 const RecordType *RT = T->getAs<RecordType>(); 3292 if (!RT) 3293 return false; 3294 3295 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3296 3297 // We can't answer whether something is abstract until it has a 3298 // definition. If it's currently being defined, we'll walk back 3299 // over all the declarations when we have a full definition. 3300 const CXXRecordDecl *Def = RD->getDefinition(); 3301 if (!Def || Def->isBeingDefined()) 3302 return false; 3303 3304 if (!RD->isAbstract()) 3305 return false; 3306 3307 Diag(Loc, PD) << RD->getDeclName(); 3308 DiagnoseAbstractType(RD); 3309 3310 return true; 3311} 3312 3313void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3314 // Check if we've already emitted the list of pure virtual functions 3315 // for this class. 3316 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3317 return; 3318 3319 CXXFinalOverriderMap FinalOverriders; 3320 RD->getFinalOverriders(FinalOverriders); 3321 3322 // Keep a set of seen pure methods so we won't diagnose the same method 3323 // more than once. 3324 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3325 3326 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3327 MEnd = FinalOverriders.end(); 3328 M != MEnd; 3329 ++M) { 3330 for (OverridingMethods::iterator SO = M->second.begin(), 3331 SOEnd = M->second.end(); 3332 SO != SOEnd; ++SO) { 3333 // C++ [class.abstract]p4: 3334 // A class is abstract if it contains or inherits at least one 3335 // pure virtual function for which the final overrider is pure 3336 // virtual. 3337 3338 // 3339 if (SO->second.size() != 1) 3340 continue; 3341 3342 if (!SO->second.front().Method->isPure()) 3343 continue; 3344 3345 if (!SeenPureMethods.insert(SO->second.front().Method)) 3346 continue; 3347 3348 Diag(SO->second.front().Method->getLocation(), 3349 diag::note_pure_virtual_function) 3350 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3351 } 3352 } 3353 3354 if (!PureVirtualClassDiagSet) 3355 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3356 PureVirtualClassDiagSet->insert(RD); 3357} 3358 3359namespace { 3360struct AbstractUsageInfo { 3361 Sema &S; 3362 CXXRecordDecl *Record; 3363 CanQualType AbstractType; 3364 bool Invalid; 3365 3366 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3367 : S(S), Record(Record), 3368 AbstractType(S.Context.getCanonicalType( 3369 S.Context.getTypeDeclType(Record))), 3370 Invalid(false) {} 3371 3372 void DiagnoseAbstractType() { 3373 if (Invalid) return; 3374 S.DiagnoseAbstractType(Record); 3375 Invalid = true; 3376 } 3377 3378 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3379}; 3380 3381struct CheckAbstractUsage { 3382 AbstractUsageInfo &Info; 3383 const NamedDecl *Ctx; 3384 3385 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3386 : Info(Info), Ctx(Ctx) {} 3387 3388 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3389 switch (TL.getTypeLocClass()) { 3390#define ABSTRACT_TYPELOC(CLASS, PARENT) 3391#define TYPELOC(CLASS, PARENT) \ 3392 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3393#include "clang/AST/TypeLocNodes.def" 3394 } 3395 } 3396 3397 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3398 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3399 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3400 if (!TL.getArg(I)) 3401 continue; 3402 3403 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3404 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3405 } 3406 } 3407 3408 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3409 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3410 } 3411 3412 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3413 // Visit the type parameters from a permissive context. 3414 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3415 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3416 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3417 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3418 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3419 // TODO: other template argument types? 3420 } 3421 } 3422 3423 // Visit pointee types from a permissive context. 3424#define CheckPolymorphic(Type) \ 3425 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3426 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3427 } 3428 CheckPolymorphic(PointerTypeLoc) 3429 CheckPolymorphic(ReferenceTypeLoc) 3430 CheckPolymorphic(MemberPointerTypeLoc) 3431 CheckPolymorphic(BlockPointerTypeLoc) 3432 CheckPolymorphic(AtomicTypeLoc) 3433 3434 /// Handle all the types we haven't given a more specific 3435 /// implementation for above. 3436 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3437 // Every other kind of type that we haven't called out already 3438 // that has an inner type is either (1) sugar or (2) contains that 3439 // inner type in some way as a subobject. 3440 if (TypeLoc Next = TL.getNextTypeLoc()) 3441 return Visit(Next, Sel); 3442 3443 // If there's no inner type and we're in a permissive context, 3444 // don't diagnose. 3445 if (Sel == Sema::AbstractNone) return; 3446 3447 // Check whether the type matches the abstract type. 3448 QualType T = TL.getType(); 3449 if (T->isArrayType()) { 3450 Sel = Sema::AbstractArrayType; 3451 T = Info.S.Context.getBaseElementType(T); 3452 } 3453 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3454 if (CT != Info.AbstractType) return; 3455 3456 // It matched; do some magic. 3457 if (Sel == Sema::AbstractArrayType) { 3458 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3459 << T << TL.getSourceRange(); 3460 } else { 3461 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3462 << Sel << T << TL.getSourceRange(); 3463 } 3464 Info.DiagnoseAbstractType(); 3465 } 3466}; 3467 3468void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3469 Sema::AbstractDiagSelID Sel) { 3470 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3471} 3472 3473} 3474 3475/// Check for invalid uses of an abstract type in a method declaration. 3476static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3477 CXXMethodDecl *MD) { 3478 // No need to do the check on definitions, which require that 3479 // the return/param types be complete. 3480 if (MD->doesThisDeclarationHaveABody()) 3481 return; 3482 3483 // For safety's sake, just ignore it if we don't have type source 3484 // information. This should never happen for non-implicit methods, 3485 // but... 3486 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3487 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3488} 3489 3490/// Check for invalid uses of an abstract type within a class definition. 3491static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3492 CXXRecordDecl *RD) { 3493 for (CXXRecordDecl::decl_iterator 3494 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3495 Decl *D = *I; 3496 if (D->isImplicit()) continue; 3497 3498 // Methods and method templates. 3499 if (isa<CXXMethodDecl>(D)) { 3500 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3501 } else if (isa<FunctionTemplateDecl>(D)) { 3502 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3503 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3504 3505 // Fields and static variables. 3506 } else if (isa<FieldDecl>(D)) { 3507 FieldDecl *FD = cast<FieldDecl>(D); 3508 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3509 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3510 } else if (isa<VarDecl>(D)) { 3511 VarDecl *VD = cast<VarDecl>(D); 3512 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3513 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3514 3515 // Nested classes and class templates. 3516 } else if (isa<CXXRecordDecl>(D)) { 3517 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3518 } else if (isa<ClassTemplateDecl>(D)) { 3519 CheckAbstractClassUsage(Info, 3520 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3521 } 3522 } 3523} 3524 3525/// \brief Perform semantic checks on a class definition that has been 3526/// completing, introducing implicitly-declared members, checking for 3527/// abstract types, etc. 3528void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3529 if (!Record) 3530 return; 3531 3532 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3533 AbstractUsageInfo Info(*this, Record); 3534 CheckAbstractClassUsage(Info, Record); 3535 } 3536 3537 // If this is not an aggregate type and has no user-declared constructor, 3538 // complain about any non-static data members of reference or const scalar 3539 // type, since they will never get initializers. 3540 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3541 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 3542 bool Complained = false; 3543 for (RecordDecl::field_iterator F = Record->field_begin(), 3544 FEnd = Record->field_end(); 3545 F != FEnd; ++F) { 3546 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3547 continue; 3548 3549 if (F->getType()->isReferenceType() || 3550 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3551 if (!Complained) { 3552 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3553 << Record->getTagKind() << Record; 3554 Complained = true; 3555 } 3556 3557 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3558 << F->getType()->isReferenceType() 3559 << F->getDeclName(); 3560 } 3561 } 3562 } 3563 3564 if (Record->isDynamicClass() && !Record->isDependentType()) 3565 DynamicClasses.push_back(Record); 3566 3567 if (Record->getIdentifier()) { 3568 // C++ [class.mem]p13: 3569 // If T is the name of a class, then each of the following shall have a 3570 // name different from T: 3571 // - every member of every anonymous union that is a member of class T. 3572 // 3573 // C++ [class.mem]p14: 3574 // In addition, if class T has a user-declared constructor (12.1), every 3575 // non-static data member of class T shall have a name different from T. 3576 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3577 R.first != R.second; ++R.first) { 3578 NamedDecl *D = *R.first; 3579 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3580 isa<IndirectFieldDecl>(D)) { 3581 Diag(D->getLocation(), diag::err_member_name_of_class) 3582 << D->getDeclName(); 3583 break; 3584 } 3585 } 3586 } 3587 3588 // Warn if the class has virtual methods but non-virtual public destructor. 3589 if (Record->isPolymorphic() && !Record->isDependentType()) { 3590 CXXDestructorDecl *dtor = Record->getDestructor(); 3591 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3592 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3593 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3594 } 3595 3596 // See if a method overloads virtual methods in a base 3597 /// class without overriding any. 3598 if (!Record->isDependentType()) { 3599 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3600 MEnd = Record->method_end(); 3601 M != MEnd; ++M) { 3602 if (!(*M)->isStatic()) 3603 DiagnoseHiddenVirtualMethods(Record, *M); 3604 } 3605 } 3606 3607 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3608 // function that is not a constructor declares that member function to be 3609 // const. [...] The class of which that function is a member shall be 3610 // a literal type. 3611 // 3612 // It's fine to diagnose constructors here too: such constructors cannot 3613 // produce a constant expression, so are ill-formed (no diagnostic required). 3614 // 3615 // If the class has virtual bases, any constexpr members will already have 3616 // been diagnosed by the checks performed on the member declaration, so 3617 // suppress this (less useful) diagnostic. 3618 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3619 !Record->isLiteral() && !Record->getNumVBases()) { 3620 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3621 MEnd = Record->method_end(); 3622 M != MEnd; ++M) { 3623 if ((*M)->isConstexpr()) { 3624 switch (Record->getTemplateSpecializationKind()) { 3625 case TSK_ImplicitInstantiation: 3626 case TSK_ExplicitInstantiationDeclaration: 3627 case TSK_ExplicitInstantiationDefinition: 3628 // If a template instantiates to a non-literal type, but its members 3629 // instantiate to constexpr functions, the template is technically 3630 // ill-formed, but we allow it for sanity. Such members are treated as 3631 // non-constexpr. 3632 (*M)->setConstexpr(false); 3633 continue; 3634 3635 case TSK_Undeclared: 3636 case TSK_ExplicitSpecialization: 3637 RequireLiteralType((*M)->getLocation(), Context.getRecordType(Record), 3638 PDiag(diag::err_constexpr_method_non_literal)); 3639 break; 3640 } 3641 3642 // Only produce one error per class. 3643 break; 3644 } 3645 } 3646 } 3647 3648 // Declare inherited constructors. We do this eagerly here because: 3649 // - The standard requires an eager diagnostic for conflicting inherited 3650 // constructors from different classes. 3651 // - The lazy declaration of the other implicit constructors is so as to not 3652 // waste space and performance on classes that are not meant to be 3653 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3654 // have inherited constructors. 3655 DeclareInheritedConstructors(Record); 3656 3657 if (!Record->isDependentType()) 3658 CheckExplicitlyDefaultedMethods(Record); 3659} 3660 3661void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3662 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3663 ME = Record->method_end(); 3664 MI != ME; ++MI) { 3665 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3666 switch (getSpecialMember(*MI)) { 3667 case CXXDefaultConstructor: 3668 CheckExplicitlyDefaultedDefaultConstructor( 3669 cast<CXXConstructorDecl>(*MI)); 3670 break; 3671 3672 case CXXDestructor: 3673 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3674 break; 3675 3676 case CXXCopyConstructor: 3677 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3678 break; 3679 3680 case CXXCopyAssignment: 3681 CheckExplicitlyDefaultedCopyAssignment(*MI); 3682 break; 3683 3684 case CXXMoveConstructor: 3685 CheckExplicitlyDefaultedMoveConstructor(cast<CXXConstructorDecl>(*MI)); 3686 break; 3687 3688 case CXXMoveAssignment: 3689 CheckExplicitlyDefaultedMoveAssignment(*MI); 3690 break; 3691 3692 case CXXInvalid: 3693 llvm_unreachable("non-special member explicitly defaulted!"); 3694 } 3695 } 3696 } 3697 3698} 3699 3700void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3701 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3702 3703 // Whether this was the first-declared instance of the constructor. 3704 // This affects whether we implicitly add an exception spec (and, eventually, 3705 // constexpr). It is also ill-formed to explicitly default a constructor such 3706 // that it would be deleted. (C++0x [decl.fct.def.default]) 3707 bool First = CD == CD->getCanonicalDecl(); 3708 3709 bool HadError = false; 3710 if (CD->getNumParams() != 0) { 3711 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3712 << CD->getSourceRange(); 3713 HadError = true; 3714 } 3715 3716 ImplicitExceptionSpecification Spec 3717 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3718 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3719 if (EPI.ExceptionSpecType == EST_Delayed) { 3720 // Exception specification depends on some deferred part of the class. We'll 3721 // try again when the class's definition has been fully processed. 3722 return; 3723 } 3724 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3725 *ExceptionType = Context.getFunctionType( 3726 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3727 3728 if (CtorType->hasExceptionSpec()) { 3729 if (CheckEquivalentExceptionSpec( 3730 PDiag(diag::err_incorrect_defaulted_exception_spec) 3731 << CXXDefaultConstructor, 3732 PDiag(), 3733 ExceptionType, SourceLocation(), 3734 CtorType, CD->getLocation())) { 3735 HadError = true; 3736 } 3737 } else if (First) { 3738 // We set the declaration to have the computed exception spec here. 3739 // We know there are no parameters. 3740 EPI.ExtInfo = CtorType->getExtInfo(); 3741 CD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3742 } 3743 3744 if (HadError) { 3745 CD->setInvalidDecl(); 3746 return; 3747 } 3748 3749 if (ShouldDeleteSpecialMember(CD, CXXDefaultConstructor)) { 3750 if (First) { 3751 CD->setDeletedAsWritten(); 3752 } else { 3753 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3754 << CXXDefaultConstructor; 3755 CD->setInvalidDecl(); 3756 } 3757 } 3758} 3759 3760void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3761 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3762 3763 // Whether this was the first-declared instance of the constructor. 3764 bool First = CD == CD->getCanonicalDecl(); 3765 3766 bool HadError = false; 3767 if (CD->getNumParams() != 1) { 3768 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3769 << CD->getSourceRange(); 3770 HadError = true; 3771 } 3772 3773 ImplicitExceptionSpecification Spec(Context); 3774 bool Const; 3775 llvm::tie(Spec, Const) = 3776 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3777 3778 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3779 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3780 *ExceptionType = Context.getFunctionType( 3781 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3782 3783 // Check for parameter type matching. 3784 // This is a copy ctor so we know it's a cv-qualified reference to T. 3785 QualType ArgType = CtorType->getArgType(0); 3786 if (ArgType->getPointeeType().isVolatileQualified()) { 3787 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3788 HadError = true; 3789 } 3790 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3791 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3792 HadError = true; 3793 } 3794 3795 if (CtorType->hasExceptionSpec()) { 3796 if (CheckEquivalentExceptionSpec( 3797 PDiag(diag::err_incorrect_defaulted_exception_spec) 3798 << CXXCopyConstructor, 3799 PDiag(), 3800 ExceptionType, SourceLocation(), 3801 CtorType, CD->getLocation())) { 3802 HadError = true; 3803 } 3804 } else if (First) { 3805 // We set the declaration to have the computed exception spec here. 3806 // We duplicate the one parameter type. 3807 EPI.ExtInfo = CtorType->getExtInfo(); 3808 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3809 } 3810 3811 if (HadError) { 3812 CD->setInvalidDecl(); 3813 return; 3814 } 3815 3816 if (ShouldDeleteSpecialMember(CD, CXXCopyConstructor)) { 3817 if (First) { 3818 CD->setDeletedAsWritten(); 3819 } else { 3820 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3821 << CXXCopyConstructor; 3822 CD->setInvalidDecl(); 3823 } 3824 } 3825} 3826 3827void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3828 assert(MD->isExplicitlyDefaulted()); 3829 3830 // Whether this was the first-declared instance of the operator 3831 bool First = MD == MD->getCanonicalDecl(); 3832 3833 bool HadError = false; 3834 if (MD->getNumParams() != 1) { 3835 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3836 << MD->getSourceRange(); 3837 HadError = true; 3838 } 3839 3840 QualType ReturnType = 3841 MD->getType()->getAs<FunctionType>()->getResultType(); 3842 if (!ReturnType->isLValueReferenceType() || 3843 !Context.hasSameType( 3844 Context.getCanonicalType(ReturnType->getPointeeType()), 3845 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3846 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3847 HadError = true; 3848 } 3849 3850 ImplicitExceptionSpecification Spec(Context); 3851 bool Const; 3852 llvm::tie(Spec, Const) = 3853 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 3854 3855 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3856 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3857 *ExceptionType = Context.getFunctionType( 3858 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3859 3860 QualType ArgType = OperType->getArgType(0); 3861 if (!ArgType->isLValueReferenceType()) { 3862 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 3863 HadError = true; 3864 } else { 3865 if (ArgType->getPointeeType().isVolatileQualified()) { 3866 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 3867 HadError = true; 3868 } 3869 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3870 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 3871 HadError = true; 3872 } 3873 } 3874 3875 if (OperType->getTypeQuals()) { 3876 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 3877 HadError = true; 3878 } 3879 3880 if (OperType->hasExceptionSpec()) { 3881 if (CheckEquivalentExceptionSpec( 3882 PDiag(diag::err_incorrect_defaulted_exception_spec) 3883 << CXXCopyAssignment, 3884 PDiag(), 3885 ExceptionType, SourceLocation(), 3886 OperType, MD->getLocation())) { 3887 HadError = true; 3888 } 3889 } else if (First) { 3890 // We set the declaration to have the computed exception spec here. 3891 // We duplicate the one parameter type. 3892 EPI.RefQualifier = OperType->getRefQualifier(); 3893 EPI.ExtInfo = OperType->getExtInfo(); 3894 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 3895 } 3896 3897 if (HadError) { 3898 MD->setInvalidDecl(); 3899 return; 3900 } 3901 3902 if (ShouldDeleteCopyAssignmentOperator(MD)) { 3903 if (First) { 3904 MD->setDeletedAsWritten(); 3905 } else { 3906 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 3907 << CXXCopyAssignment; 3908 MD->setInvalidDecl(); 3909 } 3910 } 3911} 3912 3913void Sema::CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *CD) { 3914 assert(CD->isExplicitlyDefaulted() && CD->isMoveConstructor()); 3915 3916 // Whether this was the first-declared instance of the constructor. 3917 bool First = CD == CD->getCanonicalDecl(); 3918 3919 bool HadError = false; 3920 if (CD->getNumParams() != 1) { 3921 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_params) 3922 << CD->getSourceRange(); 3923 HadError = true; 3924 } 3925 3926 ImplicitExceptionSpecification Spec( 3927 ComputeDefaultedMoveCtorExceptionSpec(CD->getParent())); 3928 3929 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3930 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3931 *ExceptionType = Context.getFunctionType( 3932 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3933 3934 // Check for parameter type matching. 3935 // This is a move ctor so we know it's a cv-qualified rvalue reference to T. 3936 QualType ArgType = CtorType->getArgType(0); 3937 if (ArgType->getPointeeType().isVolatileQualified()) { 3938 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_volatile_param); 3939 HadError = true; 3940 } 3941 if (ArgType->getPointeeType().isConstQualified()) { 3942 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_const_param); 3943 HadError = true; 3944 } 3945 3946 if (CtorType->hasExceptionSpec()) { 3947 if (CheckEquivalentExceptionSpec( 3948 PDiag(diag::err_incorrect_defaulted_exception_spec) 3949 << CXXMoveConstructor, 3950 PDiag(), 3951 ExceptionType, SourceLocation(), 3952 CtorType, CD->getLocation())) { 3953 HadError = true; 3954 } 3955 } else if (First) { 3956 // We set the declaration to have the computed exception spec here. 3957 // We duplicate the one parameter type. 3958 EPI.ExtInfo = CtorType->getExtInfo(); 3959 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3960 } 3961 3962 if (HadError) { 3963 CD->setInvalidDecl(); 3964 return; 3965 } 3966 3967 if (ShouldDeleteSpecialMember(CD, CXXMoveConstructor)) { 3968 if (First) { 3969 CD->setDeletedAsWritten(); 3970 } else { 3971 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3972 << CXXMoveConstructor; 3973 CD->setInvalidDecl(); 3974 } 3975 } 3976} 3977 3978void Sema::CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *MD) { 3979 assert(MD->isExplicitlyDefaulted()); 3980 3981 // Whether this was the first-declared instance of the operator 3982 bool First = MD == MD->getCanonicalDecl(); 3983 3984 bool HadError = false; 3985 if (MD->getNumParams() != 1) { 3986 Diag(MD->getLocation(), diag::err_defaulted_move_assign_params) 3987 << MD->getSourceRange(); 3988 HadError = true; 3989 } 3990 3991 QualType ReturnType = 3992 MD->getType()->getAs<FunctionType>()->getResultType(); 3993 if (!ReturnType->isLValueReferenceType() || 3994 !Context.hasSameType( 3995 Context.getCanonicalType(ReturnType->getPointeeType()), 3996 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3997 Diag(MD->getLocation(), diag::err_defaulted_move_assign_return_type); 3998 HadError = true; 3999 } 4000 4001 ImplicitExceptionSpecification Spec( 4002 ComputeDefaultedMoveCtorExceptionSpec(MD->getParent())); 4003 4004 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4005 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4006 *ExceptionType = Context.getFunctionType( 4007 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4008 4009 QualType ArgType = OperType->getArgType(0); 4010 if (!ArgType->isRValueReferenceType()) { 4011 Diag(MD->getLocation(), diag::err_defaulted_move_assign_not_ref); 4012 HadError = true; 4013 } else { 4014 if (ArgType->getPointeeType().isVolatileQualified()) { 4015 Diag(MD->getLocation(), diag::err_defaulted_move_assign_volatile_param); 4016 HadError = true; 4017 } 4018 if (ArgType->getPointeeType().isConstQualified()) { 4019 Diag(MD->getLocation(), diag::err_defaulted_move_assign_const_param); 4020 HadError = true; 4021 } 4022 } 4023 4024 if (OperType->getTypeQuals()) { 4025 Diag(MD->getLocation(), diag::err_defaulted_move_assign_quals); 4026 HadError = true; 4027 } 4028 4029 if (OperType->hasExceptionSpec()) { 4030 if (CheckEquivalentExceptionSpec( 4031 PDiag(diag::err_incorrect_defaulted_exception_spec) 4032 << CXXMoveAssignment, 4033 PDiag(), 4034 ExceptionType, SourceLocation(), 4035 OperType, MD->getLocation())) { 4036 HadError = true; 4037 } 4038 } else if (First) { 4039 // We set the declaration to have the computed exception spec here. 4040 // We duplicate the one parameter type. 4041 EPI.RefQualifier = OperType->getRefQualifier(); 4042 EPI.ExtInfo = OperType->getExtInfo(); 4043 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4044 } 4045 4046 if (HadError) { 4047 MD->setInvalidDecl(); 4048 return; 4049 } 4050 4051 if (ShouldDeleteMoveAssignmentOperator(MD)) { 4052 if (First) { 4053 MD->setDeletedAsWritten(); 4054 } else { 4055 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4056 << CXXMoveAssignment; 4057 MD->setInvalidDecl(); 4058 } 4059 } 4060} 4061 4062void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 4063 assert(DD->isExplicitlyDefaulted()); 4064 4065 // Whether this was the first-declared instance of the destructor. 4066 bool First = DD == DD->getCanonicalDecl(); 4067 4068 ImplicitExceptionSpecification Spec 4069 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 4070 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4071 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 4072 *ExceptionType = Context.getFunctionType( 4073 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4074 4075 if (DtorType->hasExceptionSpec()) { 4076 if (CheckEquivalentExceptionSpec( 4077 PDiag(diag::err_incorrect_defaulted_exception_spec) 4078 << CXXDestructor, 4079 PDiag(), 4080 ExceptionType, SourceLocation(), 4081 DtorType, DD->getLocation())) { 4082 DD->setInvalidDecl(); 4083 return; 4084 } 4085 } else if (First) { 4086 // We set the declaration to have the computed exception spec here. 4087 // There are no parameters. 4088 EPI.ExtInfo = DtorType->getExtInfo(); 4089 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 4090 } 4091 4092 if (ShouldDeleteDestructor(DD)) { 4093 if (First) { 4094 DD->setDeletedAsWritten(); 4095 } else { 4096 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 4097 << CXXDestructor; 4098 DD->setInvalidDecl(); 4099 } 4100 } 4101} 4102 4103/// This function implements the following C++0x paragraphs: 4104/// - [class.ctor]/5 4105/// - [class.copy]/11 4106bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM) { 4107 assert(!MD->isInvalidDecl()); 4108 CXXRecordDecl *RD = MD->getParent(); 4109 assert(!RD->isDependentType() && "do deletion after instantiation"); 4110 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4111 return false; 4112 4113 bool IsUnion = RD->isUnion(); 4114 bool IsConstructor = false; 4115 bool IsAssignment = false; 4116 bool IsMove = false; 4117 4118 bool ConstArg = false; 4119 4120 switch (CSM) { 4121 case CXXDefaultConstructor: 4122 IsConstructor = true; 4123 break; 4124 case CXXCopyConstructor: 4125 IsConstructor = true; 4126 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4127 break; 4128 case CXXMoveConstructor: 4129 IsConstructor = true; 4130 IsMove = true; 4131 break; 4132 default: 4133 llvm_unreachable("function only currently implemented for default ctors"); 4134 } 4135 4136 SourceLocation Loc = MD->getLocation(); 4137 4138 // Do access control from the special member function 4139 ContextRAII MethodContext(*this, MD); 4140 4141 bool AllConst = true; 4142 4143 // We do this because we should never actually use an anonymous 4144 // union's constructor. 4145 if (IsUnion && RD->isAnonymousStructOrUnion()) 4146 return false; 4147 4148 // FIXME: We should put some diagnostic logic right into this function. 4149 4150 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4151 BE = RD->bases_end(); 4152 BI != BE; ++BI) { 4153 // We'll handle this one later 4154 if (BI->isVirtual()) 4155 continue; 4156 4157 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4158 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4159 4160 // Unless we have an assignment operator, the base's destructor must 4161 // be accessible and not deleted. 4162 if (!IsAssignment) { 4163 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4164 if (BaseDtor->isDeleted()) 4165 return true; 4166 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4167 AR_accessible) 4168 return true; 4169 } 4170 4171 // Finding the corresponding member in the base should lead to a 4172 // unique, accessible, non-deleted function. If we are doing 4173 // a destructor, we have already checked this case. 4174 if (CSM != CXXDestructor) { 4175 SpecialMemberOverloadResult *SMOR = 4176 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, false, false, 4177 false); 4178 if (!SMOR->hasSuccess()) 4179 return true; 4180 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4181 if (IsConstructor) { 4182 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4183 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4184 PDiag()) != AR_accessible) 4185 return true; 4186 4187 // For a move operation, the corresponding operation must actually 4188 // be a move operation (and not a copy selected by overload 4189 // resolution) unless we are working on a trivially copyable class. 4190 if (IsMove && !BaseCtor->isMoveConstructor() && 4191 !BaseDecl->isTriviallyCopyable()) 4192 return true; 4193 } 4194 } 4195 } 4196 4197 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4198 BE = RD->vbases_end(); 4199 BI != BE; ++BI) { 4200 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4201 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4202 4203 // Unless we have an assignment operator, the base's destructor must 4204 // be accessible and not deleted. 4205 if (!IsAssignment) { 4206 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4207 if (BaseDtor->isDeleted()) 4208 return true; 4209 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4210 AR_accessible) 4211 return true; 4212 } 4213 4214 // Finding the corresponding member in the base should lead to a 4215 // unique, accessible, non-deleted function. 4216 if (CSM != CXXDestructor) { 4217 SpecialMemberOverloadResult *SMOR = 4218 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, false, false, 4219 false); 4220 if (!SMOR->hasSuccess()) 4221 return true; 4222 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4223 if (IsConstructor) { 4224 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4225 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4226 PDiag()) != AR_accessible) 4227 return true; 4228 4229 // For a move operation, the corresponding operation must actually 4230 // be a move operation (and not a copy selected by overload 4231 // resolution) unless we are working on a trivially copyable class. 4232 if (IsMove && !BaseCtor->isMoveConstructor() && 4233 !BaseDecl->isTriviallyCopyable()) 4234 return true; 4235 } 4236 } 4237 } 4238 4239 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4240 FE = RD->field_end(); 4241 FI != FE; ++FI) { 4242 if (FI->isInvalidDecl() || FI->isUnnamedBitfield()) 4243 continue; 4244 4245 QualType FieldType = Context.getBaseElementType(FI->getType()); 4246 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4247 4248 // For a default constructor, all references must be initialized in-class 4249 // and, if a union, it must have a non-const member. 4250 if (CSM == CXXDefaultConstructor) { 4251 if (FieldType->isReferenceType() && !FI->hasInClassInitializer()) 4252 return true; 4253 4254 if (IsUnion && !FieldType.isConstQualified()) 4255 AllConst = false; 4256 // For a copy constructor, data members must not be of rvalue reference 4257 // type. 4258 } else if (CSM == CXXCopyConstructor) { 4259 if (FieldType->isRValueReferenceType()) 4260 return true; 4261 } 4262 4263 if (FieldRecord) { 4264 // For a default constructor, a const member must have a user-provided 4265 // default constructor or else be explicitly initialized. 4266 if (CSM == CXXDefaultConstructor && FieldType.isConstQualified() && 4267 !FI->hasInClassInitializer() && 4268 !FieldRecord->hasUserProvidedDefaultConstructor()) 4269 return true; 4270 4271 // Some additional restrictions exist on the variant members. 4272 if (!IsUnion && FieldRecord->isUnion() && 4273 FieldRecord->isAnonymousStructOrUnion()) { 4274 // We're okay to reuse AllConst here since we only care about the 4275 // value otherwise if we're in a union. 4276 AllConst = true; 4277 4278 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4279 UE = FieldRecord->field_end(); 4280 UI != UE; ++UI) { 4281 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4282 CXXRecordDecl *UnionFieldRecord = 4283 UnionFieldType->getAsCXXRecordDecl(); 4284 4285 if (!UnionFieldType.isConstQualified()) 4286 AllConst = false; 4287 4288 if (UnionFieldRecord) { 4289 // FIXME: Checking for accessibility and validity of this 4290 // destructor is technically going beyond the 4291 // standard, but this is believed to be a defect. 4292 if (!IsAssignment) { 4293 CXXDestructorDecl *FieldDtor = LookupDestructor(UnionFieldRecord); 4294 if (FieldDtor->isDeleted()) 4295 return true; 4296 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4297 AR_accessible) 4298 return true; 4299 if (!FieldDtor->isTrivial()) 4300 return true; 4301 } 4302 4303 if (CSM != CXXDestructor) { 4304 SpecialMemberOverloadResult *SMOR = 4305 LookupSpecialMember(UnionFieldRecord, CSM, ConstArg, false, 4306 false, false, false); 4307 // FIXME: Checking for accessibility and validity of this 4308 // corresponding member is technically going beyond the 4309 // standard, but this is believed to be a defect. 4310 if (!SMOR->hasSuccess()) 4311 return true; 4312 4313 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4314 // A member of a union must have a trivial corresponding 4315 // constructor. 4316 if (!FieldMember->isTrivial()) 4317 return true; 4318 4319 if (IsConstructor) { 4320 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4321 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4322 PDiag()) != AR_accessible) 4323 return true; 4324 } 4325 } 4326 } 4327 } 4328 4329 // At least one member in each anonymous union must be non-const 4330 if (CSM == CXXDefaultConstructor && AllConst) 4331 return true; 4332 4333 // Don't try to initialize the anonymous union 4334 // This is technically non-conformant, but sanity demands it. 4335 continue; 4336 } 4337 4338 // Unless we're doing assignment, the field's destructor must be 4339 // accessible and not deleted. 4340 if (!IsAssignment) { 4341 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4342 if (FieldDtor->isDeleted()) 4343 return true; 4344 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4345 AR_accessible) 4346 return true; 4347 } 4348 4349 // Check that the corresponding member of the field is accessible, 4350 // unique, and non-deleted. We don't do this if it has an explicit 4351 // initialization when default-constructing. 4352 if (CSM != CXXDestructor && 4353 (CSM != CXXDefaultConstructor || !FI->hasInClassInitializer())) { 4354 SpecialMemberOverloadResult *SMOR = 4355 LookupSpecialMember(FieldRecord, CSM, ConstArg, false, false, false, 4356 false); 4357 if (!SMOR->hasSuccess()) 4358 return true; 4359 4360 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4361 if (IsConstructor) { 4362 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4363 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4364 PDiag()) != AR_accessible) 4365 return true; 4366 4367 // For a move operation, the corresponding operation must actually 4368 // be a move operation (and not a copy selected by overload 4369 // resolution) unless we are working on a trivially copyable class. 4370 if (IsMove && !FieldCtor->isMoveConstructor() && 4371 !FieldRecord->isTriviallyCopyable()) 4372 return true; 4373 } 4374 4375 // We need the corresponding member of a union to be trivial so that 4376 // we can safely copy them all simultaneously. 4377 // FIXME: Note that performing the check here (where we rely on the lack 4378 // of an in-class initializer) is technically ill-formed. However, this 4379 // seems most obviously to be a bug in the standard. 4380 if (IsUnion && !FieldMember->isTrivial()) 4381 return true; 4382 } 4383 } else if (CSM == CXXDefaultConstructor && !IsUnion && 4384 FieldType.isConstQualified() && !FI->hasInClassInitializer()) { 4385 // We can't initialize a const member of non-class type to any value. 4386 return true; 4387 } 4388 } 4389 4390 // We can't have all const members in a union when default-constructing, 4391 // or else they're all nonsensical garbage values that can't be changed. 4392 if (CSM == CXXDefaultConstructor && IsUnion && AllConst) 4393 return true; 4394 4395 return false; 4396} 4397 4398bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) { 4399 CXXRecordDecl *RD = MD->getParent(); 4400 assert(!RD->isDependentType() && "do deletion after instantiation"); 4401 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4402 return false; 4403 4404 SourceLocation Loc = MD->getLocation(); 4405 4406 // Do access control from the constructor 4407 ContextRAII MethodContext(*this, MD); 4408 4409 bool Union = RD->isUnion(); 4410 4411 unsigned ArgQuals = 4412 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 4413 Qualifiers::Const : 0; 4414 4415 // We do this because we should never actually use an anonymous 4416 // union's constructor. 4417 if (Union && RD->isAnonymousStructOrUnion()) 4418 return false; 4419 4420 // FIXME: We should put some diagnostic logic right into this function. 4421 4422 // C++0x [class.copy]/20 4423 // A defaulted [copy] assignment operator for class X is defined as deleted 4424 // if X has: 4425 4426 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4427 BE = RD->bases_end(); 4428 BI != BE; ++BI) { 4429 // We'll handle this one later 4430 if (BI->isVirtual()) 4431 continue; 4432 4433 QualType BaseType = BI->getType(); 4434 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4435 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4436 4437 // -- a [direct base class] B that cannot be [copied] because overload 4438 // resolution, as applied to B's [copy] assignment operator, results in 4439 // an ambiguity or a function that is deleted or inaccessible from the 4440 // assignment operator 4441 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4442 0); 4443 if (!CopyOper || CopyOper->isDeleted()) 4444 return true; 4445 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4446 return true; 4447 } 4448 4449 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4450 BE = RD->vbases_end(); 4451 BI != BE; ++BI) { 4452 QualType BaseType = BI->getType(); 4453 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4454 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4455 4456 // -- a [virtual base class] B that cannot be [copied] because overload 4457 // resolution, as applied to B's [copy] assignment operator, results in 4458 // an ambiguity or a function that is deleted or inaccessible from the 4459 // assignment operator 4460 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4461 0); 4462 if (!CopyOper || CopyOper->isDeleted()) 4463 return true; 4464 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4465 return true; 4466 } 4467 4468 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4469 FE = RD->field_end(); 4470 FI != FE; ++FI) { 4471 if (FI->isUnnamedBitfield()) 4472 continue; 4473 4474 QualType FieldType = Context.getBaseElementType(FI->getType()); 4475 4476 // -- a non-static data member of reference type 4477 if (FieldType->isReferenceType()) 4478 return true; 4479 4480 // -- a non-static data member of const non-class type (or array thereof) 4481 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4482 return true; 4483 4484 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4485 4486 if (FieldRecord) { 4487 // This is an anonymous union 4488 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4489 // Anonymous unions inside unions do not variant members create 4490 if (!Union) { 4491 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4492 UE = FieldRecord->field_end(); 4493 UI != UE; ++UI) { 4494 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4495 CXXRecordDecl *UnionFieldRecord = 4496 UnionFieldType->getAsCXXRecordDecl(); 4497 4498 // -- a variant member with a non-trivial [copy] assignment operator 4499 // and X is a union-like class 4500 if (UnionFieldRecord && 4501 !UnionFieldRecord->hasTrivialCopyAssignment()) 4502 return true; 4503 } 4504 } 4505 4506 // Don't try to initalize an anonymous union 4507 continue; 4508 // -- a variant member with a non-trivial [copy] assignment operator 4509 // and X is a union-like class 4510 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 4511 return true; 4512 } 4513 4514 CXXMethodDecl *CopyOper = LookupCopyingAssignment(FieldRecord, ArgQuals, 4515 false, 0); 4516 if (!CopyOper || CopyOper->isDeleted()) 4517 return true; 4518 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4519 return true; 4520 } 4521 } 4522 4523 return false; 4524} 4525 4526bool Sema::ShouldDeleteMoveAssignmentOperator(CXXMethodDecl *MD) { 4527 CXXRecordDecl *RD = MD->getParent(); 4528 assert(!RD->isDependentType() && "do deletion after instantiation"); 4529 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4530 return false; 4531 4532 SourceLocation Loc = MD->getLocation(); 4533 4534 // Do access control from the constructor 4535 ContextRAII MethodContext(*this, MD); 4536 4537 bool Union = RD->isUnion(); 4538 4539 // We do this because we should never actually use an anonymous 4540 // union's constructor. 4541 if (Union && RD->isAnonymousStructOrUnion()) 4542 return false; 4543 4544 // C++0x [class.copy]/20 4545 // A defaulted [move] assignment operator for class X is defined as deleted 4546 // if X has: 4547 4548 // -- for the move constructor, [...] any direct or indirect virtual base 4549 // class. 4550 if (RD->getNumVBases() != 0) 4551 return true; 4552 4553 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4554 BE = RD->bases_end(); 4555 BI != BE; ++BI) { 4556 4557 QualType BaseType = BI->getType(); 4558 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4559 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4560 4561 // -- a [direct base class] B that cannot be [moved] because overload 4562 // resolution, as applied to B's [move] assignment operator, results in 4563 // an ambiguity or a function that is deleted or inaccessible from the 4564 // assignment operator 4565 CXXMethodDecl *MoveOper = LookupMovingAssignment(BaseDecl, false, 0); 4566 if (!MoveOper || MoveOper->isDeleted()) 4567 return true; 4568 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4569 return true; 4570 4571 // -- for the move assignment operator, a [direct base class] with a type 4572 // that does not have a move assignment operator and is not trivially 4573 // copyable. 4574 if (!MoveOper->isMoveAssignmentOperator() && 4575 !BaseDecl->isTriviallyCopyable()) 4576 return true; 4577 } 4578 4579 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4580 FE = RD->field_end(); 4581 FI != FE; ++FI) { 4582 if (FI->isUnnamedBitfield()) 4583 continue; 4584 4585 QualType FieldType = Context.getBaseElementType(FI->getType()); 4586 4587 // -- a non-static data member of reference type 4588 if (FieldType->isReferenceType()) 4589 return true; 4590 4591 // -- a non-static data member of const non-class type (or array thereof) 4592 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4593 return true; 4594 4595 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4596 4597 if (FieldRecord) { 4598 // This is an anonymous union 4599 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4600 // Anonymous unions inside unions do not variant members create 4601 if (!Union) { 4602 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4603 UE = FieldRecord->field_end(); 4604 UI != UE; ++UI) { 4605 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4606 CXXRecordDecl *UnionFieldRecord = 4607 UnionFieldType->getAsCXXRecordDecl(); 4608 4609 // -- a variant member with a non-trivial [move] assignment operator 4610 // and X is a union-like class 4611 if (UnionFieldRecord && 4612 !UnionFieldRecord->hasTrivialMoveAssignment()) 4613 return true; 4614 } 4615 } 4616 4617 // Don't try to initalize an anonymous union 4618 continue; 4619 // -- a variant member with a non-trivial [move] assignment operator 4620 // and X is a union-like class 4621 } else if (Union && !FieldRecord->hasTrivialMoveAssignment()) { 4622 return true; 4623 } 4624 4625 CXXMethodDecl *MoveOper = LookupMovingAssignment(FieldRecord, false, 0); 4626 if (!MoveOper || MoveOper->isDeleted()) 4627 return true; 4628 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4629 return true; 4630 4631 // -- for the move assignment operator, a [non-static data member] with a 4632 // type that does not have a move assignment operator and is not 4633 // trivially copyable. 4634 if (!MoveOper->isMoveAssignmentOperator() && 4635 !FieldRecord->isTriviallyCopyable()) 4636 return true; 4637 } 4638 } 4639 4640 return false; 4641} 4642 4643bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 4644 CXXRecordDecl *RD = DD->getParent(); 4645 assert(!RD->isDependentType() && "do deletion after instantiation"); 4646 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4647 return false; 4648 4649 SourceLocation Loc = DD->getLocation(); 4650 4651 // Do access control from the destructor 4652 ContextRAII CtorContext(*this, DD); 4653 4654 bool Union = RD->isUnion(); 4655 4656 // We do this because we should never actually use an anonymous 4657 // union's destructor. 4658 if (Union && RD->isAnonymousStructOrUnion()) 4659 return false; 4660 4661 // C++0x [class.dtor]p5 4662 // A defaulted destructor for a class X is defined as deleted if: 4663 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4664 BE = RD->bases_end(); 4665 BI != BE; ++BI) { 4666 // We'll handle this one later 4667 if (BI->isVirtual()) 4668 continue; 4669 4670 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4671 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4672 assert(BaseDtor && "base has no destructor"); 4673 4674 // -- any direct or virtual base class has a deleted destructor or 4675 // a destructor that is inaccessible from the defaulted destructor 4676 if (BaseDtor->isDeleted()) 4677 return true; 4678 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4679 AR_accessible) 4680 return true; 4681 } 4682 4683 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4684 BE = RD->vbases_end(); 4685 BI != BE; ++BI) { 4686 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4687 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4688 assert(BaseDtor && "base has no destructor"); 4689 4690 // -- any direct or virtual base class has a deleted destructor or 4691 // a destructor that is inaccessible from the defaulted destructor 4692 if (BaseDtor->isDeleted()) 4693 return true; 4694 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4695 AR_accessible) 4696 return true; 4697 } 4698 4699 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4700 FE = RD->field_end(); 4701 FI != FE; ++FI) { 4702 QualType FieldType = Context.getBaseElementType(FI->getType()); 4703 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4704 if (FieldRecord) { 4705 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4706 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4707 UE = FieldRecord->field_end(); 4708 UI != UE; ++UI) { 4709 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 4710 CXXRecordDecl *UnionFieldRecord = 4711 UnionFieldType->getAsCXXRecordDecl(); 4712 4713 // -- X is a union-like class that has a variant member with a non- 4714 // trivial destructor. 4715 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 4716 return true; 4717 } 4718 // Technically we are supposed to do this next check unconditionally. 4719 // But that makes absolutely no sense. 4720 } else { 4721 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4722 4723 // -- any of the non-static data members has class type M (or array 4724 // thereof) and M has a deleted destructor or a destructor that is 4725 // inaccessible from the defaulted destructor 4726 if (FieldDtor->isDeleted()) 4727 return true; 4728 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4729 AR_accessible) 4730 return true; 4731 4732 // -- X is a union-like class that has a variant member with a non- 4733 // trivial destructor. 4734 if (Union && !FieldDtor->isTrivial()) 4735 return true; 4736 } 4737 } 4738 } 4739 4740 if (DD->isVirtual()) { 4741 FunctionDecl *OperatorDelete = 0; 4742 DeclarationName Name = 4743 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4744 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete, 4745 false)) 4746 return true; 4747 } 4748 4749 4750 return false; 4751} 4752 4753/// \brief Data used with FindHiddenVirtualMethod 4754namespace { 4755 struct FindHiddenVirtualMethodData { 4756 Sema *S; 4757 CXXMethodDecl *Method; 4758 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4759 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4760 }; 4761} 4762 4763/// \brief Member lookup function that determines whether a given C++ 4764/// method overloads virtual methods in a base class without overriding any, 4765/// to be used with CXXRecordDecl::lookupInBases(). 4766static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4767 CXXBasePath &Path, 4768 void *UserData) { 4769 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4770 4771 FindHiddenVirtualMethodData &Data 4772 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4773 4774 DeclarationName Name = Data.Method->getDeclName(); 4775 assert(Name.getNameKind() == DeclarationName::Identifier); 4776 4777 bool foundSameNameMethod = false; 4778 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4779 for (Path.Decls = BaseRecord->lookup(Name); 4780 Path.Decls.first != Path.Decls.second; 4781 ++Path.Decls.first) { 4782 NamedDecl *D = *Path.Decls.first; 4783 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4784 MD = MD->getCanonicalDecl(); 4785 foundSameNameMethod = true; 4786 // Interested only in hidden virtual methods. 4787 if (!MD->isVirtual()) 4788 continue; 4789 // If the method we are checking overrides a method from its base 4790 // don't warn about the other overloaded methods. 4791 if (!Data.S->IsOverload(Data.Method, MD, false)) 4792 return true; 4793 // Collect the overload only if its hidden. 4794 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4795 overloadedMethods.push_back(MD); 4796 } 4797 } 4798 4799 if (foundSameNameMethod) 4800 Data.OverloadedMethods.append(overloadedMethods.begin(), 4801 overloadedMethods.end()); 4802 return foundSameNameMethod; 4803} 4804 4805/// \brief See if a method overloads virtual methods in a base class without 4806/// overriding any. 4807void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4808 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4809 MD->getLocation()) == DiagnosticsEngine::Ignored) 4810 return; 4811 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4812 return; 4813 4814 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4815 /*bool RecordPaths=*/false, 4816 /*bool DetectVirtual=*/false); 4817 FindHiddenVirtualMethodData Data; 4818 Data.Method = MD; 4819 Data.S = this; 4820 4821 // Keep the base methods that were overriden or introduced in the subclass 4822 // by 'using' in a set. A base method not in this set is hidden. 4823 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4824 res.first != res.second; ++res.first) { 4825 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4826 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4827 E = MD->end_overridden_methods(); 4828 I != E; ++I) 4829 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4830 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4831 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4832 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4833 } 4834 4835 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4836 !Data.OverloadedMethods.empty()) { 4837 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4838 << MD << (Data.OverloadedMethods.size() > 1); 4839 4840 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4841 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4842 Diag(overloadedMD->getLocation(), 4843 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4844 } 4845 } 4846} 4847 4848void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4849 Decl *TagDecl, 4850 SourceLocation LBrac, 4851 SourceLocation RBrac, 4852 AttributeList *AttrList) { 4853 if (!TagDecl) 4854 return; 4855 4856 AdjustDeclIfTemplate(TagDecl); 4857 4858 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4859 // strict aliasing violation! 4860 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4861 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4862 4863 CheckCompletedCXXClass( 4864 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4865} 4866 4867/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4868/// special functions, such as the default constructor, copy 4869/// constructor, or destructor, to the given C++ class (C++ 4870/// [special]p1). This routine can only be executed just before the 4871/// definition of the class is complete. 4872void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4873 if (!ClassDecl->hasUserDeclaredConstructor()) 4874 ++ASTContext::NumImplicitDefaultConstructors; 4875 4876 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4877 ++ASTContext::NumImplicitCopyConstructors; 4878 4879 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4880 ++ASTContext::NumImplicitCopyAssignmentOperators; 4881 4882 // If we have a dynamic class, then the copy assignment operator may be 4883 // virtual, so we have to declare it immediately. This ensures that, e.g., 4884 // it shows up in the right place in the vtable and that we diagnose 4885 // problems with the implicit exception specification. 4886 if (ClassDecl->isDynamicClass()) 4887 DeclareImplicitCopyAssignment(ClassDecl); 4888 } 4889 4890 if (!ClassDecl->hasUserDeclaredDestructor()) { 4891 ++ASTContext::NumImplicitDestructors; 4892 4893 // If we have a dynamic class, then the destructor may be virtual, so we 4894 // have to declare the destructor immediately. This ensures that, e.g., it 4895 // shows up in the right place in the vtable and that we diagnose problems 4896 // with the implicit exception specification. 4897 if (ClassDecl->isDynamicClass()) 4898 DeclareImplicitDestructor(ClassDecl); 4899 } 4900} 4901 4902void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4903 if (!D) 4904 return; 4905 4906 int NumParamList = D->getNumTemplateParameterLists(); 4907 for (int i = 0; i < NumParamList; i++) { 4908 TemplateParameterList* Params = D->getTemplateParameterList(i); 4909 for (TemplateParameterList::iterator Param = Params->begin(), 4910 ParamEnd = Params->end(); 4911 Param != ParamEnd; ++Param) { 4912 NamedDecl *Named = cast<NamedDecl>(*Param); 4913 if (Named->getDeclName()) { 4914 S->AddDecl(Named); 4915 IdResolver.AddDecl(Named); 4916 } 4917 } 4918 } 4919} 4920 4921void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4922 if (!D) 4923 return; 4924 4925 TemplateParameterList *Params = 0; 4926 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4927 Params = Template->getTemplateParameters(); 4928 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4929 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4930 Params = PartialSpec->getTemplateParameters(); 4931 else 4932 return; 4933 4934 for (TemplateParameterList::iterator Param = Params->begin(), 4935 ParamEnd = Params->end(); 4936 Param != ParamEnd; ++Param) { 4937 NamedDecl *Named = cast<NamedDecl>(*Param); 4938 if (Named->getDeclName()) { 4939 S->AddDecl(Named); 4940 IdResolver.AddDecl(Named); 4941 } 4942 } 4943} 4944 4945void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4946 if (!RecordD) return; 4947 AdjustDeclIfTemplate(RecordD); 4948 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4949 PushDeclContext(S, Record); 4950} 4951 4952void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4953 if (!RecordD) return; 4954 PopDeclContext(); 4955} 4956 4957/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4958/// parsing a top-level (non-nested) C++ class, and we are now 4959/// parsing those parts of the given Method declaration that could 4960/// not be parsed earlier (C++ [class.mem]p2), such as default 4961/// arguments. This action should enter the scope of the given 4962/// Method declaration as if we had just parsed the qualified method 4963/// name. However, it should not bring the parameters into scope; 4964/// that will be performed by ActOnDelayedCXXMethodParameter. 4965void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4966} 4967 4968/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4969/// C++ method declaration. We're (re-)introducing the given 4970/// function parameter into scope for use in parsing later parts of 4971/// the method declaration. For example, we could see an 4972/// ActOnParamDefaultArgument event for this parameter. 4973void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4974 if (!ParamD) 4975 return; 4976 4977 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4978 4979 // If this parameter has an unparsed default argument, clear it out 4980 // to make way for the parsed default argument. 4981 if (Param->hasUnparsedDefaultArg()) 4982 Param->setDefaultArg(0); 4983 4984 S->AddDecl(Param); 4985 if (Param->getDeclName()) 4986 IdResolver.AddDecl(Param); 4987} 4988 4989/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4990/// processing the delayed method declaration for Method. The method 4991/// declaration is now considered finished. There may be a separate 4992/// ActOnStartOfFunctionDef action later (not necessarily 4993/// immediately!) for this method, if it was also defined inside the 4994/// class body. 4995void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4996 if (!MethodD) 4997 return; 4998 4999 AdjustDeclIfTemplate(MethodD); 5000 5001 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5002 5003 // Now that we have our default arguments, check the constructor 5004 // again. It could produce additional diagnostics or affect whether 5005 // the class has implicitly-declared destructors, among other 5006 // things. 5007 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5008 CheckConstructor(Constructor); 5009 5010 // Check the default arguments, which we may have added. 5011 if (!Method->isInvalidDecl()) 5012 CheckCXXDefaultArguments(Method); 5013} 5014 5015/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5016/// the well-formedness of the constructor declarator @p D with type @p 5017/// R. If there are any errors in the declarator, this routine will 5018/// emit diagnostics and set the invalid bit to true. In any case, the type 5019/// will be updated to reflect a well-formed type for the constructor and 5020/// returned. 5021QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5022 StorageClass &SC) { 5023 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5024 5025 // C++ [class.ctor]p3: 5026 // A constructor shall not be virtual (10.3) or static (9.4). A 5027 // constructor can be invoked for a const, volatile or const 5028 // volatile object. A constructor shall not be declared const, 5029 // volatile, or const volatile (9.3.2). 5030 if (isVirtual) { 5031 if (!D.isInvalidType()) 5032 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5033 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5034 << SourceRange(D.getIdentifierLoc()); 5035 D.setInvalidType(); 5036 } 5037 if (SC == SC_Static) { 5038 if (!D.isInvalidType()) 5039 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5040 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5041 << SourceRange(D.getIdentifierLoc()); 5042 D.setInvalidType(); 5043 SC = SC_None; 5044 } 5045 5046 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5047 if (FTI.TypeQuals != 0) { 5048 if (FTI.TypeQuals & Qualifiers::Const) 5049 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5050 << "const" << SourceRange(D.getIdentifierLoc()); 5051 if (FTI.TypeQuals & Qualifiers::Volatile) 5052 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5053 << "volatile" << SourceRange(D.getIdentifierLoc()); 5054 if (FTI.TypeQuals & Qualifiers::Restrict) 5055 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5056 << "restrict" << SourceRange(D.getIdentifierLoc()); 5057 D.setInvalidType(); 5058 } 5059 5060 // C++0x [class.ctor]p4: 5061 // A constructor shall not be declared with a ref-qualifier. 5062 if (FTI.hasRefQualifier()) { 5063 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5064 << FTI.RefQualifierIsLValueRef 5065 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5066 D.setInvalidType(); 5067 } 5068 5069 // Rebuild the function type "R" without any type qualifiers (in 5070 // case any of the errors above fired) and with "void" as the 5071 // return type, since constructors don't have return types. 5072 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5073 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5074 return R; 5075 5076 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5077 EPI.TypeQuals = 0; 5078 EPI.RefQualifier = RQ_None; 5079 5080 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5081 Proto->getNumArgs(), EPI); 5082} 5083 5084/// CheckConstructor - Checks a fully-formed constructor for 5085/// well-formedness, issuing any diagnostics required. Returns true if 5086/// the constructor declarator is invalid. 5087void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5088 CXXRecordDecl *ClassDecl 5089 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5090 if (!ClassDecl) 5091 return Constructor->setInvalidDecl(); 5092 5093 // C++ [class.copy]p3: 5094 // A declaration of a constructor for a class X is ill-formed if 5095 // its first parameter is of type (optionally cv-qualified) X and 5096 // either there are no other parameters or else all other 5097 // parameters have default arguments. 5098 if (!Constructor->isInvalidDecl() && 5099 ((Constructor->getNumParams() == 1) || 5100 (Constructor->getNumParams() > 1 && 5101 Constructor->getParamDecl(1)->hasDefaultArg())) && 5102 Constructor->getTemplateSpecializationKind() 5103 != TSK_ImplicitInstantiation) { 5104 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5105 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5106 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5107 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5108 const char *ConstRef 5109 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5110 : " const &"; 5111 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5112 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5113 5114 // FIXME: Rather that making the constructor invalid, we should endeavor 5115 // to fix the type. 5116 Constructor->setInvalidDecl(); 5117 } 5118 } 5119} 5120 5121/// CheckDestructor - Checks a fully-formed destructor definition for 5122/// well-formedness, issuing any diagnostics required. Returns true 5123/// on error. 5124bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5125 CXXRecordDecl *RD = Destructor->getParent(); 5126 5127 if (Destructor->isVirtual()) { 5128 SourceLocation Loc; 5129 5130 if (!Destructor->isImplicit()) 5131 Loc = Destructor->getLocation(); 5132 else 5133 Loc = RD->getLocation(); 5134 5135 // If we have a virtual destructor, look up the deallocation function 5136 FunctionDecl *OperatorDelete = 0; 5137 DeclarationName Name = 5138 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5139 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5140 return true; 5141 5142 MarkDeclarationReferenced(Loc, OperatorDelete); 5143 5144 Destructor->setOperatorDelete(OperatorDelete); 5145 } 5146 5147 return false; 5148} 5149 5150static inline bool 5151FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5152 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5153 FTI.ArgInfo[0].Param && 5154 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5155} 5156 5157/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5158/// the well-formednes of the destructor declarator @p D with type @p 5159/// R. If there are any errors in the declarator, this routine will 5160/// emit diagnostics and set the declarator to invalid. Even if this happens, 5161/// will be updated to reflect a well-formed type for the destructor and 5162/// returned. 5163QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5164 StorageClass& SC) { 5165 // C++ [class.dtor]p1: 5166 // [...] A typedef-name that names a class is a class-name 5167 // (7.1.3); however, a typedef-name that names a class shall not 5168 // be used as the identifier in the declarator for a destructor 5169 // declaration. 5170 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5171 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5172 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5173 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5174 else if (const TemplateSpecializationType *TST = 5175 DeclaratorType->getAs<TemplateSpecializationType>()) 5176 if (TST->isTypeAlias()) 5177 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5178 << DeclaratorType << 1; 5179 5180 // C++ [class.dtor]p2: 5181 // A destructor is used to destroy objects of its class type. A 5182 // destructor takes no parameters, and no return type can be 5183 // specified for it (not even void). The address of a destructor 5184 // shall not be taken. A destructor shall not be static. A 5185 // destructor can be invoked for a const, volatile or const 5186 // volatile object. A destructor shall not be declared const, 5187 // volatile or const volatile (9.3.2). 5188 if (SC == SC_Static) { 5189 if (!D.isInvalidType()) 5190 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5191 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5192 << SourceRange(D.getIdentifierLoc()) 5193 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5194 5195 SC = SC_None; 5196 } 5197 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5198 // Destructors don't have return types, but the parser will 5199 // happily parse something like: 5200 // 5201 // class X { 5202 // float ~X(); 5203 // }; 5204 // 5205 // The return type will be eliminated later. 5206 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5207 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5208 << SourceRange(D.getIdentifierLoc()); 5209 } 5210 5211 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5212 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5213 if (FTI.TypeQuals & Qualifiers::Const) 5214 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5215 << "const" << SourceRange(D.getIdentifierLoc()); 5216 if (FTI.TypeQuals & Qualifiers::Volatile) 5217 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5218 << "volatile" << SourceRange(D.getIdentifierLoc()); 5219 if (FTI.TypeQuals & Qualifiers::Restrict) 5220 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5221 << "restrict" << SourceRange(D.getIdentifierLoc()); 5222 D.setInvalidType(); 5223 } 5224 5225 // C++0x [class.dtor]p2: 5226 // A destructor shall not be declared with a ref-qualifier. 5227 if (FTI.hasRefQualifier()) { 5228 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5229 << FTI.RefQualifierIsLValueRef 5230 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5231 D.setInvalidType(); 5232 } 5233 5234 // Make sure we don't have any parameters. 5235 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5236 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5237 5238 // Delete the parameters. 5239 FTI.freeArgs(); 5240 D.setInvalidType(); 5241 } 5242 5243 // Make sure the destructor isn't variadic. 5244 if (FTI.isVariadic) { 5245 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5246 D.setInvalidType(); 5247 } 5248 5249 // Rebuild the function type "R" without any type qualifiers or 5250 // parameters (in case any of the errors above fired) and with 5251 // "void" as the return type, since destructors don't have return 5252 // types. 5253 if (!D.isInvalidType()) 5254 return R; 5255 5256 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5257 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5258 EPI.Variadic = false; 5259 EPI.TypeQuals = 0; 5260 EPI.RefQualifier = RQ_None; 5261 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5262} 5263 5264/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5265/// well-formednes of the conversion function declarator @p D with 5266/// type @p R. If there are any errors in the declarator, this routine 5267/// will emit diagnostics and return true. Otherwise, it will return 5268/// false. Either way, the type @p R will be updated to reflect a 5269/// well-formed type for the conversion operator. 5270void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5271 StorageClass& SC) { 5272 // C++ [class.conv.fct]p1: 5273 // Neither parameter types nor return type can be specified. The 5274 // type of a conversion function (8.3.5) is "function taking no 5275 // parameter returning conversion-type-id." 5276 if (SC == SC_Static) { 5277 if (!D.isInvalidType()) 5278 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5279 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5280 << SourceRange(D.getIdentifierLoc()); 5281 D.setInvalidType(); 5282 SC = SC_None; 5283 } 5284 5285 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5286 5287 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5288 // Conversion functions don't have return types, but the parser will 5289 // happily parse something like: 5290 // 5291 // class X { 5292 // float operator bool(); 5293 // }; 5294 // 5295 // The return type will be changed later anyway. 5296 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5297 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5298 << SourceRange(D.getIdentifierLoc()); 5299 D.setInvalidType(); 5300 } 5301 5302 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5303 5304 // Make sure we don't have any parameters. 5305 if (Proto->getNumArgs() > 0) { 5306 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5307 5308 // Delete the parameters. 5309 D.getFunctionTypeInfo().freeArgs(); 5310 D.setInvalidType(); 5311 } else if (Proto->isVariadic()) { 5312 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5313 D.setInvalidType(); 5314 } 5315 5316 // Diagnose "&operator bool()" and other such nonsense. This 5317 // is actually a gcc extension which we don't support. 5318 if (Proto->getResultType() != ConvType) { 5319 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5320 << Proto->getResultType(); 5321 D.setInvalidType(); 5322 ConvType = Proto->getResultType(); 5323 } 5324 5325 // C++ [class.conv.fct]p4: 5326 // The conversion-type-id shall not represent a function type nor 5327 // an array type. 5328 if (ConvType->isArrayType()) { 5329 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5330 ConvType = Context.getPointerType(ConvType); 5331 D.setInvalidType(); 5332 } else if (ConvType->isFunctionType()) { 5333 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5334 ConvType = Context.getPointerType(ConvType); 5335 D.setInvalidType(); 5336 } 5337 5338 // Rebuild the function type "R" without any parameters (in case any 5339 // of the errors above fired) and with the conversion type as the 5340 // return type. 5341 if (D.isInvalidType()) 5342 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5343 5344 // C++0x explicit conversion operators. 5345 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 5346 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5347 diag::warn_explicit_conversion_functions) 5348 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5349} 5350 5351/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5352/// the declaration of the given C++ conversion function. This routine 5353/// is responsible for recording the conversion function in the C++ 5354/// class, if possible. 5355Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5356 assert(Conversion && "Expected to receive a conversion function declaration"); 5357 5358 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5359 5360 // Make sure we aren't redeclaring the conversion function. 5361 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5362 5363 // C++ [class.conv.fct]p1: 5364 // [...] A conversion function is never used to convert a 5365 // (possibly cv-qualified) object to the (possibly cv-qualified) 5366 // same object type (or a reference to it), to a (possibly 5367 // cv-qualified) base class of that type (or a reference to it), 5368 // or to (possibly cv-qualified) void. 5369 // FIXME: Suppress this warning if the conversion function ends up being a 5370 // virtual function that overrides a virtual function in a base class. 5371 QualType ClassType 5372 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5373 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5374 ConvType = ConvTypeRef->getPointeeType(); 5375 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5376 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5377 /* Suppress diagnostics for instantiations. */; 5378 else if (ConvType->isRecordType()) { 5379 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5380 if (ConvType == ClassType) 5381 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5382 << ClassType; 5383 else if (IsDerivedFrom(ClassType, ConvType)) 5384 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5385 << ClassType << ConvType; 5386 } else if (ConvType->isVoidType()) { 5387 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5388 << ClassType << ConvType; 5389 } 5390 5391 if (FunctionTemplateDecl *ConversionTemplate 5392 = Conversion->getDescribedFunctionTemplate()) 5393 return ConversionTemplate; 5394 5395 return Conversion; 5396} 5397 5398//===----------------------------------------------------------------------===// 5399// Namespace Handling 5400//===----------------------------------------------------------------------===// 5401 5402 5403 5404/// ActOnStartNamespaceDef - This is called at the start of a namespace 5405/// definition. 5406Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5407 SourceLocation InlineLoc, 5408 SourceLocation NamespaceLoc, 5409 SourceLocation IdentLoc, 5410 IdentifierInfo *II, 5411 SourceLocation LBrace, 5412 AttributeList *AttrList) { 5413 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5414 // For anonymous namespace, take the location of the left brace. 5415 SourceLocation Loc = II ? IdentLoc : LBrace; 5416 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 5417 StartLoc, Loc, II); 5418 Namespc->setInline(InlineLoc.isValid()); 5419 5420 Scope *DeclRegionScope = NamespcScope->getParent(); 5421 5422 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5423 5424 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5425 PushNamespaceVisibilityAttr(Attr); 5426 5427 if (II) { 5428 // C++ [namespace.def]p2: 5429 // The identifier in an original-namespace-definition shall not 5430 // have been previously defined in the declarative region in 5431 // which the original-namespace-definition appears. The 5432 // identifier in an original-namespace-definition is the name of 5433 // the namespace. Subsequently in that declarative region, it is 5434 // treated as an original-namespace-name. 5435 // 5436 // Since namespace names are unique in their scope, and we don't 5437 // look through using directives, just look for any ordinary names. 5438 5439 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5440 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5441 Decl::IDNS_Namespace; 5442 NamedDecl *PrevDecl = 0; 5443 for (DeclContext::lookup_result R 5444 = CurContext->getRedeclContext()->lookup(II); 5445 R.first != R.second; ++R.first) { 5446 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5447 PrevDecl = *R.first; 5448 break; 5449 } 5450 } 5451 5452 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 5453 // This is an extended namespace definition. 5454 if (Namespc->isInline() != OrigNS->isInline()) { 5455 // inline-ness must match 5456 if (OrigNS->isInline()) { 5457 // The user probably just forgot the 'inline', so suggest that it 5458 // be added back. 5459 Diag(Namespc->getLocation(), 5460 diag::warn_inline_namespace_reopened_noninline) 5461 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5462 } else { 5463 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 5464 << Namespc->isInline(); 5465 } 5466 Diag(OrigNS->getLocation(), diag::note_previous_definition); 5467 5468 // Recover by ignoring the new namespace's inline status. 5469 Namespc->setInline(OrigNS->isInline()); 5470 } 5471 5472 // Attach this namespace decl to the chain of extended namespace 5473 // definitions. 5474 OrigNS->setNextNamespace(Namespc); 5475 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 5476 5477 // Remove the previous declaration from the scope. 5478 if (DeclRegionScope->isDeclScope(OrigNS)) { 5479 IdResolver.RemoveDecl(OrigNS); 5480 DeclRegionScope->RemoveDecl(OrigNS); 5481 } 5482 } else if (PrevDecl) { 5483 // This is an invalid name redefinition. 5484 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 5485 << Namespc->getDeclName(); 5486 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5487 Namespc->setInvalidDecl(); 5488 // Continue on to push Namespc as current DeclContext and return it. 5489 } else if (II->isStr("std") && 5490 CurContext->getRedeclContext()->isTranslationUnit()) { 5491 // This is the first "real" definition of the namespace "std", so update 5492 // our cache of the "std" namespace to point at this definition. 5493 if (NamespaceDecl *StdNS = getStdNamespace()) { 5494 // We had already defined a dummy namespace "std". Link this new 5495 // namespace definition to the dummy namespace "std". 5496 StdNS->setNextNamespace(Namespc); 5497 StdNS->setLocation(IdentLoc); 5498 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 5499 } 5500 5501 // Make our StdNamespace cache point at the first real definition of the 5502 // "std" namespace. 5503 StdNamespace = Namespc; 5504 5505 // Add this instance of "std" to the set of known namespaces 5506 KnownNamespaces[Namespc] = false; 5507 } else if (!Namespc->isInline()) { 5508 // Since this is an "original" namespace, add it to the known set of 5509 // namespaces if it is not an inline namespace. 5510 KnownNamespaces[Namespc] = false; 5511 } 5512 5513 PushOnScopeChains(Namespc, DeclRegionScope); 5514 } else { 5515 // Anonymous namespaces. 5516 assert(Namespc->isAnonymousNamespace()); 5517 5518 // Link the anonymous namespace into its parent. 5519 NamespaceDecl *PrevDecl; 5520 DeclContext *Parent = CurContext->getRedeclContext(); 5521 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5522 PrevDecl = TU->getAnonymousNamespace(); 5523 TU->setAnonymousNamespace(Namespc); 5524 } else { 5525 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5526 PrevDecl = ND->getAnonymousNamespace(); 5527 ND->setAnonymousNamespace(Namespc); 5528 } 5529 5530 // Link the anonymous namespace with its previous declaration. 5531 if (PrevDecl) { 5532 assert(PrevDecl->isAnonymousNamespace()); 5533 assert(!PrevDecl->getNextNamespace()); 5534 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 5535 PrevDecl->setNextNamespace(Namespc); 5536 5537 if (Namespc->isInline() != PrevDecl->isInline()) { 5538 // inline-ness must match 5539 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 5540 << Namespc->isInline(); 5541 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5542 Namespc->setInvalidDecl(); 5543 // Recover by ignoring the new namespace's inline status. 5544 Namespc->setInline(PrevDecl->isInline()); 5545 } 5546 } 5547 5548 CurContext->addDecl(Namespc); 5549 5550 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5551 // behaves as if it were replaced by 5552 // namespace unique { /* empty body */ } 5553 // using namespace unique; 5554 // namespace unique { namespace-body } 5555 // where all occurrences of 'unique' in a translation unit are 5556 // replaced by the same identifier and this identifier differs 5557 // from all other identifiers in the entire program. 5558 5559 // We just create the namespace with an empty name and then add an 5560 // implicit using declaration, just like the standard suggests. 5561 // 5562 // CodeGen enforces the "universally unique" aspect by giving all 5563 // declarations semantically contained within an anonymous 5564 // namespace internal linkage. 5565 5566 if (!PrevDecl) { 5567 UsingDirectiveDecl* UD 5568 = UsingDirectiveDecl::Create(Context, CurContext, 5569 /* 'using' */ LBrace, 5570 /* 'namespace' */ SourceLocation(), 5571 /* qualifier */ NestedNameSpecifierLoc(), 5572 /* identifier */ SourceLocation(), 5573 Namespc, 5574 /* Ancestor */ CurContext); 5575 UD->setImplicit(); 5576 CurContext->addDecl(UD); 5577 } 5578 } 5579 5580 // Although we could have an invalid decl (i.e. the namespace name is a 5581 // redefinition), push it as current DeclContext and try to continue parsing. 5582 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5583 // for the namespace has the declarations that showed up in that particular 5584 // namespace definition. 5585 PushDeclContext(NamespcScope, Namespc); 5586 return Namespc; 5587} 5588 5589/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5590/// is a namespace alias, returns the namespace it points to. 5591static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5592 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5593 return AD->getNamespace(); 5594 return dyn_cast_or_null<NamespaceDecl>(D); 5595} 5596 5597/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5598/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5599void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5600 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5601 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5602 Namespc->setRBraceLoc(RBrace); 5603 PopDeclContext(); 5604 if (Namespc->hasAttr<VisibilityAttr>()) 5605 PopPragmaVisibility(); 5606} 5607 5608CXXRecordDecl *Sema::getStdBadAlloc() const { 5609 return cast_or_null<CXXRecordDecl>( 5610 StdBadAlloc.get(Context.getExternalSource())); 5611} 5612 5613NamespaceDecl *Sema::getStdNamespace() const { 5614 return cast_or_null<NamespaceDecl>( 5615 StdNamespace.get(Context.getExternalSource())); 5616} 5617 5618/// \brief Retrieve the special "std" namespace, which may require us to 5619/// implicitly define the namespace. 5620NamespaceDecl *Sema::getOrCreateStdNamespace() { 5621 if (!StdNamespace) { 5622 // The "std" namespace has not yet been defined, so build one implicitly. 5623 StdNamespace = NamespaceDecl::Create(Context, 5624 Context.getTranslationUnitDecl(), 5625 SourceLocation(), SourceLocation(), 5626 &PP.getIdentifierTable().get("std")); 5627 getStdNamespace()->setImplicit(true); 5628 } 5629 5630 return getStdNamespace(); 5631} 5632 5633/// \brief Determine whether a using statement is in a context where it will be 5634/// apply in all contexts. 5635static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5636 switch (CurContext->getDeclKind()) { 5637 case Decl::TranslationUnit: 5638 return true; 5639 case Decl::LinkageSpec: 5640 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5641 default: 5642 return false; 5643 } 5644} 5645 5646static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5647 CXXScopeSpec &SS, 5648 SourceLocation IdentLoc, 5649 IdentifierInfo *Ident) { 5650 R.clear(); 5651 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5652 R.getLookupKind(), Sc, &SS, NULL, 5653 false, S.CTC_NoKeywords, NULL)) { 5654 if (Corrected.getCorrectionDeclAs<NamespaceDecl>() || 5655 Corrected.getCorrectionDeclAs<NamespaceAliasDecl>()) { 5656 std::string CorrectedStr(Corrected.getAsString(S.getLangOptions())); 5657 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOptions())); 5658 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5659 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5660 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5661 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5662 else 5663 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5664 << Ident << CorrectedQuotedStr 5665 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5666 5667 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5668 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5669 5670 Ident = Corrected.getCorrectionAsIdentifierInfo(); 5671 R.addDecl(Corrected.getCorrectionDecl()); 5672 return true; 5673 } 5674 R.setLookupName(Ident); 5675 } 5676 return false; 5677} 5678 5679Decl *Sema::ActOnUsingDirective(Scope *S, 5680 SourceLocation UsingLoc, 5681 SourceLocation NamespcLoc, 5682 CXXScopeSpec &SS, 5683 SourceLocation IdentLoc, 5684 IdentifierInfo *NamespcName, 5685 AttributeList *AttrList) { 5686 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5687 assert(NamespcName && "Invalid NamespcName."); 5688 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5689 5690 // This can only happen along a recovery path. 5691 while (S->getFlags() & Scope::TemplateParamScope) 5692 S = S->getParent(); 5693 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5694 5695 UsingDirectiveDecl *UDir = 0; 5696 NestedNameSpecifier *Qualifier = 0; 5697 if (SS.isSet()) 5698 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5699 5700 // Lookup namespace name. 5701 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5702 LookupParsedName(R, S, &SS); 5703 if (R.isAmbiguous()) 5704 return 0; 5705 5706 if (R.empty()) { 5707 R.clear(); 5708 // Allow "using namespace std;" or "using namespace ::std;" even if 5709 // "std" hasn't been defined yet, for GCC compatibility. 5710 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5711 NamespcName->isStr("std")) { 5712 Diag(IdentLoc, diag::ext_using_undefined_std); 5713 R.addDecl(getOrCreateStdNamespace()); 5714 R.resolveKind(); 5715 } 5716 // Otherwise, attempt typo correction. 5717 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5718 } 5719 5720 if (!R.empty()) { 5721 NamedDecl *Named = R.getFoundDecl(); 5722 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5723 && "expected namespace decl"); 5724 // C++ [namespace.udir]p1: 5725 // A using-directive specifies that the names in the nominated 5726 // namespace can be used in the scope in which the 5727 // using-directive appears after the using-directive. During 5728 // unqualified name lookup (3.4.1), the names appear as if they 5729 // were declared in the nearest enclosing namespace which 5730 // contains both the using-directive and the nominated 5731 // namespace. [Note: in this context, "contains" means "contains 5732 // directly or indirectly". ] 5733 5734 // Find enclosing context containing both using-directive and 5735 // nominated namespace. 5736 NamespaceDecl *NS = getNamespaceDecl(Named); 5737 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5738 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5739 CommonAncestor = CommonAncestor->getParent(); 5740 5741 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5742 SS.getWithLocInContext(Context), 5743 IdentLoc, Named, CommonAncestor); 5744 5745 if (IsUsingDirectiveInToplevelContext(CurContext) && 5746 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5747 Diag(IdentLoc, diag::warn_using_directive_in_header); 5748 } 5749 5750 PushUsingDirective(S, UDir); 5751 } else { 5752 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5753 } 5754 5755 // FIXME: We ignore attributes for now. 5756 return UDir; 5757} 5758 5759void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5760 // If scope has associated entity, then using directive is at namespace 5761 // or translation unit scope. We add UsingDirectiveDecls, into 5762 // it's lookup structure. 5763 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 5764 Ctx->addDecl(UDir); 5765 else 5766 // Otherwise it is block-sope. using-directives will affect lookup 5767 // only to the end of scope. 5768 S->PushUsingDirective(UDir); 5769} 5770 5771 5772Decl *Sema::ActOnUsingDeclaration(Scope *S, 5773 AccessSpecifier AS, 5774 bool HasUsingKeyword, 5775 SourceLocation UsingLoc, 5776 CXXScopeSpec &SS, 5777 UnqualifiedId &Name, 5778 AttributeList *AttrList, 5779 bool IsTypeName, 5780 SourceLocation TypenameLoc) { 5781 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5782 5783 switch (Name.getKind()) { 5784 case UnqualifiedId::IK_ImplicitSelfParam: 5785 case UnqualifiedId::IK_Identifier: 5786 case UnqualifiedId::IK_OperatorFunctionId: 5787 case UnqualifiedId::IK_LiteralOperatorId: 5788 case UnqualifiedId::IK_ConversionFunctionId: 5789 break; 5790 5791 case UnqualifiedId::IK_ConstructorName: 5792 case UnqualifiedId::IK_ConstructorTemplateId: 5793 // C++0x inherited constructors. 5794 if (getLangOptions().CPlusPlus0x) break; 5795 5796 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 5797 << SS.getRange(); 5798 return 0; 5799 5800 case UnqualifiedId::IK_DestructorName: 5801 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 5802 << SS.getRange(); 5803 return 0; 5804 5805 case UnqualifiedId::IK_TemplateId: 5806 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 5807 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5808 return 0; 5809 } 5810 5811 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5812 DeclarationName TargetName = TargetNameInfo.getName(); 5813 if (!TargetName) 5814 return 0; 5815 5816 // Warn about using declarations. 5817 // TODO: store that the declaration was written without 'using' and 5818 // talk about access decls instead of using decls in the 5819 // diagnostics. 5820 if (!HasUsingKeyword) { 5821 UsingLoc = Name.getSourceRange().getBegin(); 5822 5823 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5824 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5825 } 5826 5827 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5828 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5829 return 0; 5830 5831 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5832 TargetNameInfo, AttrList, 5833 /* IsInstantiation */ false, 5834 IsTypeName, TypenameLoc); 5835 if (UD) 5836 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5837 5838 return UD; 5839} 5840 5841/// \brief Determine whether a using declaration considers the given 5842/// declarations as "equivalent", e.g., if they are redeclarations of 5843/// the same entity or are both typedefs of the same type. 5844static bool 5845IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5846 bool &SuppressRedeclaration) { 5847 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5848 SuppressRedeclaration = false; 5849 return true; 5850 } 5851 5852 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5853 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5854 SuppressRedeclaration = true; 5855 return Context.hasSameType(TD1->getUnderlyingType(), 5856 TD2->getUnderlyingType()); 5857 } 5858 5859 return false; 5860} 5861 5862 5863/// Determines whether to create a using shadow decl for a particular 5864/// decl, given the set of decls existing prior to this using lookup. 5865bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5866 const LookupResult &Previous) { 5867 // Diagnose finding a decl which is not from a base class of the 5868 // current class. We do this now because there are cases where this 5869 // function will silently decide not to build a shadow decl, which 5870 // will pre-empt further diagnostics. 5871 // 5872 // We don't need to do this in C++0x because we do the check once on 5873 // the qualifier. 5874 // 5875 // FIXME: diagnose the following if we care enough: 5876 // struct A { int foo; }; 5877 // struct B : A { using A::foo; }; 5878 // template <class T> struct C : A {}; 5879 // template <class T> struct D : C<T> { using B::foo; } // <--- 5880 // This is invalid (during instantiation) in C++03 because B::foo 5881 // resolves to the using decl in B, which is not a base class of D<T>. 5882 // We can't diagnose it immediately because C<T> is an unknown 5883 // specialization. The UsingShadowDecl in D<T> then points directly 5884 // to A::foo, which will look well-formed when we instantiate. 5885 // The right solution is to not collapse the shadow-decl chain. 5886 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 5887 DeclContext *OrigDC = Orig->getDeclContext(); 5888 5889 // Handle enums and anonymous structs. 5890 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5891 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5892 while (OrigRec->isAnonymousStructOrUnion()) 5893 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5894 5895 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5896 if (OrigDC == CurContext) { 5897 Diag(Using->getLocation(), 5898 diag::err_using_decl_nested_name_specifier_is_current_class) 5899 << Using->getQualifierLoc().getSourceRange(); 5900 Diag(Orig->getLocation(), diag::note_using_decl_target); 5901 return true; 5902 } 5903 5904 Diag(Using->getQualifierLoc().getBeginLoc(), 5905 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5906 << Using->getQualifier() 5907 << cast<CXXRecordDecl>(CurContext) 5908 << Using->getQualifierLoc().getSourceRange(); 5909 Diag(Orig->getLocation(), diag::note_using_decl_target); 5910 return true; 5911 } 5912 } 5913 5914 if (Previous.empty()) return false; 5915 5916 NamedDecl *Target = Orig; 5917 if (isa<UsingShadowDecl>(Target)) 5918 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5919 5920 // If the target happens to be one of the previous declarations, we 5921 // don't have a conflict. 5922 // 5923 // FIXME: but we might be increasing its access, in which case we 5924 // should redeclare it. 5925 NamedDecl *NonTag = 0, *Tag = 0; 5926 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5927 I != E; ++I) { 5928 NamedDecl *D = (*I)->getUnderlyingDecl(); 5929 bool Result; 5930 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5931 return Result; 5932 5933 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5934 } 5935 5936 if (Target->isFunctionOrFunctionTemplate()) { 5937 FunctionDecl *FD; 5938 if (isa<FunctionTemplateDecl>(Target)) 5939 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5940 else 5941 FD = cast<FunctionDecl>(Target); 5942 5943 NamedDecl *OldDecl = 0; 5944 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 5945 case Ovl_Overload: 5946 return false; 5947 5948 case Ovl_NonFunction: 5949 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5950 break; 5951 5952 // We found a decl with the exact signature. 5953 case Ovl_Match: 5954 // If we're in a record, we want to hide the target, so we 5955 // return true (without a diagnostic) to tell the caller not to 5956 // build a shadow decl. 5957 if (CurContext->isRecord()) 5958 return true; 5959 5960 // If we're not in a record, this is an error. 5961 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5962 break; 5963 } 5964 5965 Diag(Target->getLocation(), diag::note_using_decl_target); 5966 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 5967 return true; 5968 } 5969 5970 // Target is not a function. 5971 5972 if (isa<TagDecl>(Target)) { 5973 // No conflict between a tag and a non-tag. 5974 if (!Tag) return false; 5975 5976 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5977 Diag(Target->getLocation(), diag::note_using_decl_target); 5978 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 5979 return true; 5980 } 5981 5982 // No conflict between a tag and a non-tag. 5983 if (!NonTag) return false; 5984 5985 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5986 Diag(Target->getLocation(), diag::note_using_decl_target); 5987 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 5988 return true; 5989} 5990 5991/// Builds a shadow declaration corresponding to a 'using' declaration. 5992UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 5993 UsingDecl *UD, 5994 NamedDecl *Orig) { 5995 5996 // If we resolved to another shadow declaration, just coalesce them. 5997 NamedDecl *Target = Orig; 5998 if (isa<UsingShadowDecl>(Target)) { 5999 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6000 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6001 } 6002 6003 UsingShadowDecl *Shadow 6004 = UsingShadowDecl::Create(Context, CurContext, 6005 UD->getLocation(), UD, Target); 6006 UD->addShadowDecl(Shadow); 6007 6008 Shadow->setAccess(UD->getAccess()); 6009 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6010 Shadow->setInvalidDecl(); 6011 6012 if (S) 6013 PushOnScopeChains(Shadow, S); 6014 else 6015 CurContext->addDecl(Shadow); 6016 6017 6018 return Shadow; 6019} 6020 6021/// Hides a using shadow declaration. This is required by the current 6022/// using-decl implementation when a resolvable using declaration in a 6023/// class is followed by a declaration which would hide or override 6024/// one or more of the using decl's targets; for example: 6025/// 6026/// struct Base { void foo(int); }; 6027/// struct Derived : Base { 6028/// using Base::foo; 6029/// void foo(int); 6030/// }; 6031/// 6032/// The governing language is C++03 [namespace.udecl]p12: 6033/// 6034/// When a using-declaration brings names from a base class into a 6035/// derived class scope, member functions in the derived class 6036/// override and/or hide member functions with the same name and 6037/// parameter types in a base class (rather than conflicting). 6038/// 6039/// There are two ways to implement this: 6040/// (1) optimistically create shadow decls when they're not hidden 6041/// by existing declarations, or 6042/// (2) don't create any shadow decls (or at least don't make them 6043/// visible) until we've fully parsed/instantiated the class. 6044/// The problem with (1) is that we might have to retroactively remove 6045/// a shadow decl, which requires several O(n) operations because the 6046/// decl structures are (very reasonably) not designed for removal. 6047/// (2) avoids this but is very fiddly and phase-dependent. 6048void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6049 if (Shadow->getDeclName().getNameKind() == 6050 DeclarationName::CXXConversionFunctionName) 6051 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6052 6053 // Remove it from the DeclContext... 6054 Shadow->getDeclContext()->removeDecl(Shadow); 6055 6056 // ...and the scope, if applicable... 6057 if (S) { 6058 S->RemoveDecl(Shadow); 6059 IdResolver.RemoveDecl(Shadow); 6060 } 6061 6062 // ...and the using decl. 6063 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6064 6065 // TODO: complain somehow if Shadow was used. It shouldn't 6066 // be possible for this to happen, because...? 6067} 6068 6069/// Builds a using declaration. 6070/// 6071/// \param IsInstantiation - Whether this call arises from an 6072/// instantiation of an unresolved using declaration. We treat 6073/// the lookup differently for these declarations. 6074NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6075 SourceLocation UsingLoc, 6076 CXXScopeSpec &SS, 6077 const DeclarationNameInfo &NameInfo, 6078 AttributeList *AttrList, 6079 bool IsInstantiation, 6080 bool IsTypeName, 6081 SourceLocation TypenameLoc) { 6082 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6083 SourceLocation IdentLoc = NameInfo.getLoc(); 6084 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6085 6086 // FIXME: We ignore attributes for now. 6087 6088 if (SS.isEmpty()) { 6089 Diag(IdentLoc, diag::err_using_requires_qualname); 6090 return 0; 6091 } 6092 6093 // Do the redeclaration lookup in the current scope. 6094 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6095 ForRedeclaration); 6096 Previous.setHideTags(false); 6097 if (S) { 6098 LookupName(Previous, S); 6099 6100 // It is really dumb that we have to do this. 6101 LookupResult::Filter F = Previous.makeFilter(); 6102 while (F.hasNext()) { 6103 NamedDecl *D = F.next(); 6104 if (!isDeclInScope(D, CurContext, S)) 6105 F.erase(); 6106 } 6107 F.done(); 6108 } else { 6109 assert(IsInstantiation && "no scope in non-instantiation"); 6110 assert(CurContext->isRecord() && "scope not record in instantiation"); 6111 LookupQualifiedName(Previous, CurContext); 6112 } 6113 6114 // Check for invalid redeclarations. 6115 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6116 return 0; 6117 6118 // Check for bad qualifiers. 6119 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6120 return 0; 6121 6122 DeclContext *LookupContext = computeDeclContext(SS); 6123 NamedDecl *D; 6124 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6125 if (!LookupContext) { 6126 if (IsTypeName) { 6127 // FIXME: not all declaration name kinds are legal here 6128 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6129 UsingLoc, TypenameLoc, 6130 QualifierLoc, 6131 IdentLoc, NameInfo.getName()); 6132 } else { 6133 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6134 QualifierLoc, NameInfo); 6135 } 6136 } else { 6137 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6138 NameInfo, IsTypeName); 6139 } 6140 D->setAccess(AS); 6141 CurContext->addDecl(D); 6142 6143 if (!LookupContext) return D; 6144 UsingDecl *UD = cast<UsingDecl>(D); 6145 6146 if (RequireCompleteDeclContext(SS, LookupContext)) { 6147 UD->setInvalidDecl(); 6148 return UD; 6149 } 6150 6151 // Constructor inheriting using decls get special treatment. 6152 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6153 if (CheckInheritedConstructorUsingDecl(UD)) 6154 UD->setInvalidDecl(); 6155 return UD; 6156 } 6157 6158 // Otherwise, look up the target name. 6159 6160 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6161 6162 // Unlike most lookups, we don't always want to hide tag 6163 // declarations: tag names are visible through the using declaration 6164 // even if hidden by ordinary names, *except* in a dependent context 6165 // where it's important for the sanity of two-phase lookup. 6166 if (!IsInstantiation) 6167 R.setHideTags(false); 6168 6169 LookupQualifiedName(R, LookupContext); 6170 6171 if (R.empty()) { 6172 Diag(IdentLoc, diag::err_no_member) 6173 << NameInfo.getName() << LookupContext << SS.getRange(); 6174 UD->setInvalidDecl(); 6175 return UD; 6176 } 6177 6178 if (R.isAmbiguous()) { 6179 UD->setInvalidDecl(); 6180 return UD; 6181 } 6182 6183 if (IsTypeName) { 6184 // If we asked for a typename and got a non-type decl, error out. 6185 if (!R.getAsSingle<TypeDecl>()) { 6186 Diag(IdentLoc, diag::err_using_typename_non_type); 6187 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6188 Diag((*I)->getUnderlyingDecl()->getLocation(), 6189 diag::note_using_decl_target); 6190 UD->setInvalidDecl(); 6191 return UD; 6192 } 6193 } else { 6194 // If we asked for a non-typename and we got a type, error out, 6195 // but only if this is an instantiation of an unresolved using 6196 // decl. Otherwise just silently find the type name. 6197 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6198 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6199 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6200 UD->setInvalidDecl(); 6201 return UD; 6202 } 6203 } 6204 6205 // C++0x N2914 [namespace.udecl]p6: 6206 // A using-declaration shall not name a namespace. 6207 if (R.getAsSingle<NamespaceDecl>()) { 6208 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6209 << SS.getRange(); 6210 UD->setInvalidDecl(); 6211 return UD; 6212 } 6213 6214 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6215 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6216 BuildUsingShadowDecl(S, UD, *I); 6217 } 6218 6219 return UD; 6220} 6221 6222/// Additional checks for a using declaration referring to a constructor name. 6223bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 6224 if (UD->isTypeName()) { 6225 // FIXME: Cannot specify typename when specifying constructor 6226 return true; 6227 } 6228 6229 const Type *SourceType = UD->getQualifier()->getAsType(); 6230 assert(SourceType && 6231 "Using decl naming constructor doesn't have type in scope spec."); 6232 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6233 6234 // Check whether the named type is a direct base class. 6235 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6236 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6237 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6238 BaseIt != BaseE; ++BaseIt) { 6239 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6240 if (CanonicalSourceType == BaseType) 6241 break; 6242 } 6243 6244 if (BaseIt == BaseE) { 6245 // Did not find SourceType in the bases. 6246 Diag(UD->getUsingLocation(), 6247 diag::err_using_decl_constructor_not_in_direct_base) 6248 << UD->getNameInfo().getSourceRange() 6249 << QualType(SourceType, 0) << TargetClass; 6250 return true; 6251 } 6252 6253 BaseIt->setInheritConstructors(); 6254 6255 return false; 6256} 6257 6258/// Checks that the given using declaration is not an invalid 6259/// redeclaration. Note that this is checking only for the using decl 6260/// itself, not for any ill-formedness among the UsingShadowDecls. 6261bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6262 bool isTypeName, 6263 const CXXScopeSpec &SS, 6264 SourceLocation NameLoc, 6265 const LookupResult &Prev) { 6266 // C++03 [namespace.udecl]p8: 6267 // C++0x [namespace.udecl]p10: 6268 // A using-declaration is a declaration and can therefore be used 6269 // repeatedly where (and only where) multiple declarations are 6270 // allowed. 6271 // 6272 // That's in non-member contexts. 6273 if (!CurContext->getRedeclContext()->isRecord()) 6274 return false; 6275 6276 NestedNameSpecifier *Qual 6277 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6278 6279 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6280 NamedDecl *D = *I; 6281 6282 bool DTypename; 6283 NestedNameSpecifier *DQual; 6284 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6285 DTypename = UD->isTypeName(); 6286 DQual = UD->getQualifier(); 6287 } else if (UnresolvedUsingValueDecl *UD 6288 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6289 DTypename = false; 6290 DQual = UD->getQualifier(); 6291 } else if (UnresolvedUsingTypenameDecl *UD 6292 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6293 DTypename = true; 6294 DQual = UD->getQualifier(); 6295 } else continue; 6296 6297 // using decls differ if one says 'typename' and the other doesn't. 6298 // FIXME: non-dependent using decls? 6299 if (isTypeName != DTypename) continue; 6300 6301 // using decls differ if they name different scopes (but note that 6302 // template instantiation can cause this check to trigger when it 6303 // didn't before instantiation). 6304 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6305 Context.getCanonicalNestedNameSpecifier(DQual)) 6306 continue; 6307 6308 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6309 Diag(D->getLocation(), diag::note_using_decl) << 1; 6310 return true; 6311 } 6312 6313 return false; 6314} 6315 6316 6317/// Checks that the given nested-name qualifier used in a using decl 6318/// in the current context is appropriately related to the current 6319/// scope. If an error is found, diagnoses it and returns true. 6320bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6321 const CXXScopeSpec &SS, 6322 SourceLocation NameLoc) { 6323 DeclContext *NamedContext = computeDeclContext(SS); 6324 6325 if (!CurContext->isRecord()) { 6326 // C++03 [namespace.udecl]p3: 6327 // C++0x [namespace.udecl]p8: 6328 // A using-declaration for a class member shall be a member-declaration. 6329 6330 // If we weren't able to compute a valid scope, it must be a 6331 // dependent class scope. 6332 if (!NamedContext || NamedContext->isRecord()) { 6333 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6334 << SS.getRange(); 6335 return true; 6336 } 6337 6338 // Otherwise, everything is known to be fine. 6339 return false; 6340 } 6341 6342 // The current scope is a record. 6343 6344 // If the named context is dependent, we can't decide much. 6345 if (!NamedContext) { 6346 // FIXME: in C++0x, we can diagnose if we can prove that the 6347 // nested-name-specifier does not refer to a base class, which is 6348 // still possible in some cases. 6349 6350 // Otherwise we have to conservatively report that things might be 6351 // okay. 6352 return false; 6353 } 6354 6355 if (!NamedContext->isRecord()) { 6356 // Ideally this would point at the last name in the specifier, 6357 // but we don't have that level of source info. 6358 Diag(SS.getRange().getBegin(), 6359 diag::err_using_decl_nested_name_specifier_is_not_class) 6360 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6361 return true; 6362 } 6363 6364 if (!NamedContext->isDependentContext() && 6365 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6366 return true; 6367 6368 if (getLangOptions().CPlusPlus0x) { 6369 // C++0x [namespace.udecl]p3: 6370 // In a using-declaration used as a member-declaration, the 6371 // nested-name-specifier shall name a base class of the class 6372 // being defined. 6373 6374 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6375 cast<CXXRecordDecl>(NamedContext))) { 6376 if (CurContext == NamedContext) { 6377 Diag(NameLoc, 6378 diag::err_using_decl_nested_name_specifier_is_current_class) 6379 << SS.getRange(); 6380 return true; 6381 } 6382 6383 Diag(SS.getRange().getBegin(), 6384 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6385 << (NestedNameSpecifier*) SS.getScopeRep() 6386 << cast<CXXRecordDecl>(CurContext) 6387 << SS.getRange(); 6388 return true; 6389 } 6390 6391 return false; 6392 } 6393 6394 // C++03 [namespace.udecl]p4: 6395 // A using-declaration used as a member-declaration shall refer 6396 // to a member of a base class of the class being defined [etc.]. 6397 6398 // Salient point: SS doesn't have to name a base class as long as 6399 // lookup only finds members from base classes. Therefore we can 6400 // diagnose here only if we can prove that that can't happen, 6401 // i.e. if the class hierarchies provably don't intersect. 6402 6403 // TODO: it would be nice if "definitely valid" results were cached 6404 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6405 // need to be repeated. 6406 6407 struct UserData { 6408 llvm::DenseSet<const CXXRecordDecl*> Bases; 6409 6410 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6411 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6412 Data->Bases.insert(Base); 6413 return true; 6414 } 6415 6416 bool hasDependentBases(const CXXRecordDecl *Class) { 6417 return !Class->forallBases(collect, this); 6418 } 6419 6420 /// Returns true if the base is dependent or is one of the 6421 /// accumulated base classes. 6422 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6423 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6424 return !Data->Bases.count(Base); 6425 } 6426 6427 bool mightShareBases(const CXXRecordDecl *Class) { 6428 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6429 } 6430 }; 6431 6432 UserData Data; 6433 6434 // Returns false if we find a dependent base. 6435 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6436 return false; 6437 6438 // Returns false if the class has a dependent base or if it or one 6439 // of its bases is present in the base set of the current context. 6440 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6441 return false; 6442 6443 Diag(SS.getRange().getBegin(), 6444 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6445 << (NestedNameSpecifier*) SS.getScopeRep() 6446 << cast<CXXRecordDecl>(CurContext) 6447 << SS.getRange(); 6448 6449 return true; 6450} 6451 6452Decl *Sema::ActOnAliasDeclaration(Scope *S, 6453 AccessSpecifier AS, 6454 MultiTemplateParamsArg TemplateParamLists, 6455 SourceLocation UsingLoc, 6456 UnqualifiedId &Name, 6457 TypeResult Type) { 6458 // Skip up to the relevant declaration scope. 6459 while (S->getFlags() & Scope::TemplateParamScope) 6460 S = S->getParent(); 6461 assert((S->getFlags() & Scope::DeclScope) && 6462 "got alias-declaration outside of declaration scope"); 6463 6464 if (Type.isInvalid()) 6465 return 0; 6466 6467 bool Invalid = false; 6468 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6469 TypeSourceInfo *TInfo = 0; 6470 GetTypeFromParser(Type.get(), &TInfo); 6471 6472 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6473 return 0; 6474 6475 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6476 UPPC_DeclarationType)) { 6477 Invalid = true; 6478 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6479 TInfo->getTypeLoc().getBeginLoc()); 6480 } 6481 6482 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6483 LookupName(Previous, S); 6484 6485 // Warn about shadowing the name of a template parameter. 6486 if (Previous.isSingleResult() && 6487 Previous.getFoundDecl()->isTemplateParameter()) { 6488 if (DiagnoseTemplateParameterShadow(Name.StartLocation, 6489 Previous.getFoundDecl())) 6490 Invalid = true; 6491 Previous.clear(); 6492 } 6493 6494 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6495 "name in alias declaration must be an identifier"); 6496 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6497 Name.StartLocation, 6498 Name.Identifier, TInfo); 6499 6500 NewTD->setAccess(AS); 6501 6502 if (Invalid) 6503 NewTD->setInvalidDecl(); 6504 6505 CheckTypedefForVariablyModifiedType(S, NewTD); 6506 Invalid |= NewTD->isInvalidDecl(); 6507 6508 bool Redeclaration = false; 6509 6510 NamedDecl *NewND; 6511 if (TemplateParamLists.size()) { 6512 TypeAliasTemplateDecl *OldDecl = 0; 6513 TemplateParameterList *OldTemplateParams = 0; 6514 6515 if (TemplateParamLists.size() != 1) { 6516 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6517 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6518 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6519 } 6520 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6521 6522 // Only consider previous declarations in the same scope. 6523 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6524 /*ExplicitInstantiationOrSpecialization*/false); 6525 if (!Previous.empty()) { 6526 Redeclaration = true; 6527 6528 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6529 if (!OldDecl && !Invalid) { 6530 Diag(UsingLoc, diag::err_redefinition_different_kind) 6531 << Name.Identifier; 6532 6533 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6534 if (OldD->getLocation().isValid()) 6535 Diag(OldD->getLocation(), diag::note_previous_definition); 6536 6537 Invalid = true; 6538 } 6539 6540 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6541 if (TemplateParameterListsAreEqual(TemplateParams, 6542 OldDecl->getTemplateParameters(), 6543 /*Complain=*/true, 6544 TPL_TemplateMatch)) 6545 OldTemplateParams = OldDecl->getTemplateParameters(); 6546 else 6547 Invalid = true; 6548 6549 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6550 if (!Invalid && 6551 !Context.hasSameType(OldTD->getUnderlyingType(), 6552 NewTD->getUnderlyingType())) { 6553 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6554 // but we can't reasonably accept it. 6555 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6556 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6557 if (OldTD->getLocation().isValid()) 6558 Diag(OldTD->getLocation(), diag::note_previous_definition); 6559 Invalid = true; 6560 } 6561 } 6562 } 6563 6564 // Merge any previous default template arguments into our parameters, 6565 // and check the parameter list. 6566 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6567 TPC_TypeAliasTemplate)) 6568 return 0; 6569 6570 TypeAliasTemplateDecl *NewDecl = 6571 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6572 Name.Identifier, TemplateParams, 6573 NewTD); 6574 6575 NewDecl->setAccess(AS); 6576 6577 if (Invalid) 6578 NewDecl->setInvalidDecl(); 6579 else if (OldDecl) 6580 NewDecl->setPreviousDeclaration(OldDecl); 6581 6582 NewND = NewDecl; 6583 } else { 6584 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6585 NewND = NewTD; 6586 } 6587 6588 if (!Redeclaration) 6589 PushOnScopeChains(NewND, S); 6590 6591 return NewND; 6592} 6593 6594Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6595 SourceLocation NamespaceLoc, 6596 SourceLocation AliasLoc, 6597 IdentifierInfo *Alias, 6598 CXXScopeSpec &SS, 6599 SourceLocation IdentLoc, 6600 IdentifierInfo *Ident) { 6601 6602 // Lookup the namespace name. 6603 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6604 LookupParsedName(R, S, &SS); 6605 6606 // Check if we have a previous declaration with the same name. 6607 NamedDecl *PrevDecl 6608 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6609 ForRedeclaration); 6610 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6611 PrevDecl = 0; 6612 6613 if (PrevDecl) { 6614 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6615 // We already have an alias with the same name that points to the same 6616 // namespace, so don't create a new one. 6617 // FIXME: At some point, we'll want to create the (redundant) 6618 // declaration to maintain better source information. 6619 if (!R.isAmbiguous() && !R.empty() && 6620 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6621 return 0; 6622 } 6623 6624 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6625 diag::err_redefinition_different_kind; 6626 Diag(AliasLoc, DiagID) << Alias; 6627 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6628 return 0; 6629 } 6630 6631 if (R.isAmbiguous()) 6632 return 0; 6633 6634 if (R.empty()) { 6635 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6636 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 6637 return 0; 6638 } 6639 } 6640 6641 NamespaceAliasDecl *AliasDecl = 6642 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6643 Alias, SS.getWithLocInContext(Context), 6644 IdentLoc, R.getFoundDecl()); 6645 6646 PushOnScopeChains(AliasDecl, S); 6647 return AliasDecl; 6648} 6649 6650namespace { 6651 /// \brief Scoped object used to handle the state changes required in Sema 6652 /// to implicitly define the body of a C++ member function; 6653 class ImplicitlyDefinedFunctionScope { 6654 Sema &S; 6655 Sema::ContextRAII SavedContext; 6656 6657 public: 6658 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6659 : S(S), SavedContext(S, Method) 6660 { 6661 S.PushFunctionScope(); 6662 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6663 } 6664 6665 ~ImplicitlyDefinedFunctionScope() { 6666 S.PopExpressionEvaluationContext(); 6667 S.PopFunctionOrBlockScope(); 6668 } 6669 }; 6670} 6671 6672Sema::ImplicitExceptionSpecification 6673Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6674 // C++ [except.spec]p14: 6675 // An implicitly declared special member function (Clause 12) shall have an 6676 // exception-specification. [...] 6677 ImplicitExceptionSpecification ExceptSpec(Context); 6678 if (ClassDecl->isInvalidDecl()) 6679 return ExceptSpec; 6680 6681 // Direct base-class constructors. 6682 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6683 BEnd = ClassDecl->bases_end(); 6684 B != BEnd; ++B) { 6685 if (B->isVirtual()) // Handled below. 6686 continue; 6687 6688 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6689 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6690 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6691 // If this is a deleted function, add it anyway. This might be conformant 6692 // with the standard. This might not. I'm not sure. It might not matter. 6693 if (Constructor) 6694 ExceptSpec.CalledDecl(Constructor); 6695 } 6696 } 6697 6698 // Virtual base-class constructors. 6699 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6700 BEnd = ClassDecl->vbases_end(); 6701 B != BEnd; ++B) { 6702 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6703 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6704 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6705 // If this is a deleted function, add it anyway. This might be conformant 6706 // with the standard. This might not. I'm not sure. It might not matter. 6707 if (Constructor) 6708 ExceptSpec.CalledDecl(Constructor); 6709 } 6710 } 6711 6712 // Field constructors. 6713 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6714 FEnd = ClassDecl->field_end(); 6715 F != FEnd; ++F) { 6716 if (F->hasInClassInitializer()) { 6717 if (Expr *E = F->getInClassInitializer()) 6718 ExceptSpec.CalledExpr(E); 6719 else if (!F->isInvalidDecl()) 6720 ExceptSpec.SetDelayed(); 6721 } else if (const RecordType *RecordTy 6722 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6723 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6724 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6725 // If this is a deleted function, add it anyway. This might be conformant 6726 // with the standard. This might not. I'm not sure. It might not matter. 6727 // In particular, the problem is that this function never gets called. It 6728 // might just be ill-formed because this function attempts to refer to 6729 // a deleted function here. 6730 if (Constructor) 6731 ExceptSpec.CalledDecl(Constructor); 6732 } 6733 } 6734 6735 return ExceptSpec; 6736} 6737 6738CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6739 CXXRecordDecl *ClassDecl) { 6740 // C++ [class.ctor]p5: 6741 // A default constructor for a class X is a constructor of class X 6742 // that can be called without an argument. If there is no 6743 // user-declared constructor for class X, a default constructor is 6744 // implicitly declared. An implicitly-declared default constructor 6745 // is an inline public member of its class. 6746 assert(!ClassDecl->hasUserDeclaredConstructor() && 6747 "Should not build implicit default constructor!"); 6748 6749 ImplicitExceptionSpecification Spec = 6750 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6751 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6752 6753 // Create the actual constructor declaration. 6754 CanQualType ClassType 6755 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6756 SourceLocation ClassLoc = ClassDecl->getLocation(); 6757 DeclarationName Name 6758 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6759 DeclarationNameInfo NameInfo(Name, ClassLoc); 6760 CXXConstructorDecl *DefaultCon 6761 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6762 Context.getFunctionType(Context.VoidTy, 6763 0, 0, EPI), 6764 /*TInfo=*/0, 6765 /*isExplicit=*/false, 6766 /*isInline=*/true, 6767 /*isImplicitlyDeclared=*/true, 6768 // FIXME: apply the rules for definitions here 6769 /*isConstexpr=*/false); 6770 DefaultCon->setAccess(AS_public); 6771 DefaultCon->setDefaulted(); 6772 DefaultCon->setImplicit(); 6773 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6774 6775 // Note that we have declared this constructor. 6776 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6777 6778 if (Scope *S = getScopeForContext(ClassDecl)) 6779 PushOnScopeChains(DefaultCon, S, false); 6780 ClassDecl->addDecl(DefaultCon); 6781 6782 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6783 DefaultCon->setDeletedAsWritten(); 6784 6785 return DefaultCon; 6786} 6787 6788void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6789 CXXConstructorDecl *Constructor) { 6790 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6791 !Constructor->doesThisDeclarationHaveABody() && 6792 !Constructor->isDeleted()) && 6793 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6794 6795 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6796 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6797 6798 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6799 DiagnosticErrorTrap Trap(Diags); 6800 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6801 Trap.hasErrorOccurred()) { 6802 Diag(CurrentLocation, diag::note_member_synthesized_at) 6803 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6804 Constructor->setInvalidDecl(); 6805 return; 6806 } 6807 6808 SourceLocation Loc = Constructor->getLocation(); 6809 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6810 6811 Constructor->setUsed(); 6812 MarkVTableUsed(CurrentLocation, ClassDecl); 6813 6814 if (ASTMutationListener *L = getASTMutationListener()) { 6815 L->CompletedImplicitDefinition(Constructor); 6816 } 6817} 6818 6819/// Get any existing defaulted default constructor for the given class. Do not 6820/// implicitly define one if it does not exist. 6821static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6822 CXXRecordDecl *D) { 6823 ASTContext &Context = Self.Context; 6824 QualType ClassType = Context.getTypeDeclType(D); 6825 DeclarationName ConstructorName 6826 = Context.DeclarationNames.getCXXConstructorName( 6827 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6828 6829 DeclContext::lookup_const_iterator Con, ConEnd; 6830 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6831 Con != ConEnd; ++Con) { 6832 // A function template cannot be defaulted. 6833 if (isa<FunctionTemplateDecl>(*Con)) 6834 continue; 6835 6836 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6837 if (Constructor->isDefaultConstructor()) 6838 return Constructor->isDefaulted() ? Constructor : 0; 6839 } 6840 return 0; 6841} 6842 6843void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6844 if (!D) return; 6845 AdjustDeclIfTemplate(D); 6846 6847 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6848 CXXConstructorDecl *CtorDecl 6849 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6850 6851 if (!CtorDecl) return; 6852 6853 // Compute the exception specification for the default constructor. 6854 const FunctionProtoType *CtorTy = 6855 CtorDecl->getType()->castAs<FunctionProtoType>(); 6856 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6857 ImplicitExceptionSpecification Spec = 6858 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6859 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6860 assert(EPI.ExceptionSpecType != EST_Delayed); 6861 6862 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6863 } 6864 6865 // If the default constructor is explicitly defaulted, checking the exception 6866 // specification is deferred until now. 6867 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 6868 !ClassDecl->isDependentType()) 6869 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 6870} 6871 6872void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6873 // We start with an initial pass over the base classes to collect those that 6874 // inherit constructors from. If there are none, we can forgo all further 6875 // processing. 6876 typedef SmallVector<const RecordType *, 4> BasesVector; 6877 BasesVector BasesToInheritFrom; 6878 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6879 BaseE = ClassDecl->bases_end(); 6880 BaseIt != BaseE; ++BaseIt) { 6881 if (BaseIt->getInheritConstructors()) { 6882 QualType Base = BaseIt->getType(); 6883 if (Base->isDependentType()) { 6884 // If we inherit constructors from anything that is dependent, just 6885 // abort processing altogether. We'll get another chance for the 6886 // instantiations. 6887 return; 6888 } 6889 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6890 } 6891 } 6892 if (BasesToInheritFrom.empty()) 6893 return; 6894 6895 // Now collect the constructors that we already have in the current class. 6896 // Those take precedence over inherited constructors. 6897 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6898 // unless there is a user-declared constructor with the same signature in 6899 // the class where the using-declaration appears. 6900 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6901 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6902 CtorE = ClassDecl->ctor_end(); 6903 CtorIt != CtorE; ++CtorIt) { 6904 ExistingConstructors.insert( 6905 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6906 } 6907 6908 Scope *S = getScopeForContext(ClassDecl); 6909 DeclarationName CreatedCtorName = 6910 Context.DeclarationNames.getCXXConstructorName( 6911 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6912 6913 // Now comes the true work. 6914 // First, we keep a map from constructor types to the base that introduced 6915 // them. Needed for finding conflicting constructors. We also keep the 6916 // actually inserted declarations in there, for pretty diagnostics. 6917 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6918 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6919 ConstructorToSourceMap InheritedConstructors; 6920 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6921 BaseE = BasesToInheritFrom.end(); 6922 BaseIt != BaseE; ++BaseIt) { 6923 const RecordType *Base = *BaseIt; 6924 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6925 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6926 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6927 CtorE = BaseDecl->ctor_end(); 6928 CtorIt != CtorE; ++CtorIt) { 6929 // Find the using declaration for inheriting this base's constructors. 6930 DeclarationName Name = 6931 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6932 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 6933 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 6934 SourceLocation UsingLoc = UD ? UD->getLocation() : 6935 ClassDecl->getLocation(); 6936 6937 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6938 // from the class X named in the using-declaration consists of actual 6939 // constructors and notional constructors that result from the 6940 // transformation of defaulted parameters as follows: 6941 // - all non-template default constructors of X, and 6942 // - for each non-template constructor of X that has at least one 6943 // parameter with a default argument, the set of constructors that 6944 // results from omitting any ellipsis parameter specification and 6945 // successively omitting parameters with a default argument from the 6946 // end of the parameter-type-list. 6947 CXXConstructorDecl *BaseCtor = *CtorIt; 6948 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6949 const FunctionProtoType *BaseCtorType = 6950 BaseCtor->getType()->getAs<FunctionProtoType>(); 6951 6952 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6953 maxParams = BaseCtor->getNumParams(); 6954 params <= maxParams; ++params) { 6955 // Skip default constructors. They're never inherited. 6956 if (params == 0) 6957 continue; 6958 // Skip copy and move constructors for the same reason. 6959 if (CanBeCopyOrMove && params == 1) 6960 continue; 6961 6962 // Build up a function type for this particular constructor. 6963 // FIXME: The working paper does not consider that the exception spec 6964 // for the inheriting constructor might be larger than that of the 6965 // source. This code doesn't yet, either. When it does, this code will 6966 // need to be delayed until after exception specifications and in-class 6967 // member initializers are attached. 6968 const Type *NewCtorType; 6969 if (params == maxParams) 6970 NewCtorType = BaseCtorType; 6971 else { 6972 SmallVector<QualType, 16> Args; 6973 for (unsigned i = 0; i < params; ++i) { 6974 Args.push_back(BaseCtorType->getArgType(i)); 6975 } 6976 FunctionProtoType::ExtProtoInfo ExtInfo = 6977 BaseCtorType->getExtProtoInfo(); 6978 ExtInfo.Variadic = false; 6979 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 6980 Args.data(), params, ExtInfo) 6981 .getTypePtr(); 6982 } 6983 const Type *CanonicalNewCtorType = 6984 Context.getCanonicalType(NewCtorType); 6985 6986 // Now that we have the type, first check if the class already has a 6987 // constructor with this signature. 6988 if (ExistingConstructors.count(CanonicalNewCtorType)) 6989 continue; 6990 6991 // Then we check if we have already declared an inherited constructor 6992 // with this signature. 6993 std::pair<ConstructorToSourceMap::iterator, bool> result = 6994 InheritedConstructors.insert(std::make_pair( 6995 CanonicalNewCtorType, 6996 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 6997 if (!result.second) { 6998 // Already in the map. If it came from a different class, that's an 6999 // error. Not if it's from the same. 7000 CanQualType PreviousBase = result.first->second.first; 7001 if (CanonicalBase != PreviousBase) { 7002 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7003 const CXXConstructorDecl *PrevBaseCtor = 7004 PrevCtor->getInheritedConstructor(); 7005 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7006 7007 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7008 Diag(BaseCtor->getLocation(), 7009 diag::note_using_decl_constructor_conflict_current_ctor); 7010 Diag(PrevBaseCtor->getLocation(), 7011 diag::note_using_decl_constructor_conflict_previous_ctor); 7012 Diag(PrevCtor->getLocation(), 7013 diag::note_using_decl_constructor_conflict_previous_using); 7014 } 7015 continue; 7016 } 7017 7018 // OK, we're there, now add the constructor. 7019 // C++0x [class.inhctor]p8: [...] that would be performed by a 7020 // user-written inline constructor [...] 7021 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7022 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7023 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7024 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7025 /*ImplicitlyDeclared=*/true, 7026 // FIXME: Due to a defect in the standard, we treat inherited 7027 // constructors as constexpr even if that makes them ill-formed. 7028 /*Constexpr=*/BaseCtor->isConstexpr()); 7029 NewCtor->setAccess(BaseCtor->getAccess()); 7030 7031 // Build up the parameter decls and add them. 7032 SmallVector<ParmVarDecl *, 16> ParamDecls; 7033 for (unsigned i = 0; i < params; ++i) { 7034 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7035 UsingLoc, UsingLoc, 7036 /*IdentifierInfo=*/0, 7037 BaseCtorType->getArgType(i), 7038 /*TInfo=*/0, SC_None, 7039 SC_None, /*DefaultArg=*/0)); 7040 } 7041 NewCtor->setParams(ParamDecls); 7042 NewCtor->setInheritedConstructor(BaseCtor); 7043 7044 PushOnScopeChains(NewCtor, S, false); 7045 ClassDecl->addDecl(NewCtor); 7046 result.first->second.second = NewCtor; 7047 } 7048 } 7049 } 7050} 7051 7052Sema::ImplicitExceptionSpecification 7053Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7054 // C++ [except.spec]p14: 7055 // An implicitly declared special member function (Clause 12) shall have 7056 // an exception-specification. 7057 ImplicitExceptionSpecification ExceptSpec(Context); 7058 if (ClassDecl->isInvalidDecl()) 7059 return ExceptSpec; 7060 7061 // Direct base-class destructors. 7062 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7063 BEnd = ClassDecl->bases_end(); 7064 B != BEnd; ++B) { 7065 if (B->isVirtual()) // Handled below. 7066 continue; 7067 7068 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7069 ExceptSpec.CalledDecl( 7070 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7071 } 7072 7073 // Virtual base-class destructors. 7074 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7075 BEnd = ClassDecl->vbases_end(); 7076 B != BEnd; ++B) { 7077 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7078 ExceptSpec.CalledDecl( 7079 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7080 } 7081 7082 // Field destructors. 7083 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7084 FEnd = ClassDecl->field_end(); 7085 F != FEnd; ++F) { 7086 if (const RecordType *RecordTy 7087 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7088 ExceptSpec.CalledDecl( 7089 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7090 } 7091 7092 return ExceptSpec; 7093} 7094 7095CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7096 // C++ [class.dtor]p2: 7097 // If a class has no user-declared destructor, a destructor is 7098 // declared implicitly. An implicitly-declared destructor is an 7099 // inline public member of its class. 7100 7101 ImplicitExceptionSpecification Spec = 7102 ComputeDefaultedDtorExceptionSpec(ClassDecl); 7103 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7104 7105 // Create the actual destructor declaration. 7106 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 7107 7108 CanQualType ClassType 7109 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7110 SourceLocation ClassLoc = ClassDecl->getLocation(); 7111 DeclarationName Name 7112 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7113 DeclarationNameInfo NameInfo(Name, ClassLoc); 7114 CXXDestructorDecl *Destructor 7115 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 7116 /*isInline=*/true, 7117 /*isImplicitlyDeclared=*/true); 7118 Destructor->setAccess(AS_public); 7119 Destructor->setDefaulted(); 7120 Destructor->setImplicit(); 7121 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7122 7123 // Note that we have declared this destructor. 7124 ++ASTContext::NumImplicitDestructorsDeclared; 7125 7126 // Introduce this destructor into its scope. 7127 if (Scope *S = getScopeForContext(ClassDecl)) 7128 PushOnScopeChains(Destructor, S, false); 7129 ClassDecl->addDecl(Destructor); 7130 7131 // This could be uniqued if it ever proves significant. 7132 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 7133 7134 if (ShouldDeleteDestructor(Destructor)) 7135 Destructor->setDeletedAsWritten(); 7136 7137 AddOverriddenMethods(ClassDecl, Destructor); 7138 7139 return Destructor; 7140} 7141 7142void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7143 CXXDestructorDecl *Destructor) { 7144 assert((Destructor->isDefaulted() && 7145 !Destructor->doesThisDeclarationHaveABody()) && 7146 "DefineImplicitDestructor - call it for implicit default dtor"); 7147 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7148 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7149 7150 if (Destructor->isInvalidDecl()) 7151 return; 7152 7153 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7154 7155 DiagnosticErrorTrap Trap(Diags); 7156 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7157 Destructor->getParent()); 7158 7159 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7160 Diag(CurrentLocation, diag::note_member_synthesized_at) 7161 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7162 7163 Destructor->setInvalidDecl(); 7164 return; 7165 } 7166 7167 SourceLocation Loc = Destructor->getLocation(); 7168 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7169 Destructor->setImplicitlyDefined(true); 7170 Destructor->setUsed(); 7171 MarkVTableUsed(CurrentLocation, ClassDecl); 7172 7173 if (ASTMutationListener *L = getASTMutationListener()) { 7174 L->CompletedImplicitDefinition(Destructor); 7175 } 7176} 7177 7178void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 7179 CXXDestructorDecl *destructor) { 7180 // C++11 [class.dtor]p3: 7181 // A declaration of a destructor that does not have an exception- 7182 // specification is implicitly considered to have the same exception- 7183 // specification as an implicit declaration. 7184 const FunctionProtoType *dtorType = destructor->getType()-> 7185 getAs<FunctionProtoType>(); 7186 if (dtorType->hasExceptionSpec()) 7187 return; 7188 7189 ImplicitExceptionSpecification exceptSpec = 7190 ComputeDefaultedDtorExceptionSpec(classDecl); 7191 7192 // Replace the destructor's type, building off the existing one. Fortunately, 7193 // the only thing of interest in the destructor type is its extended info. 7194 // The return and arguments are fixed. 7195 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 7196 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 7197 epi.NumExceptions = exceptSpec.size(); 7198 epi.Exceptions = exceptSpec.data(); 7199 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 7200 7201 destructor->setType(ty); 7202 7203 // FIXME: If the destructor has a body that could throw, and the newly created 7204 // spec doesn't allow exceptions, we should emit a warning, because this 7205 // change in behavior can break conforming C++03 programs at runtime. 7206 // However, we don't have a body yet, so it needs to be done somewhere else. 7207} 7208 7209/// \brief Builds a statement that copies/moves the given entity from \p From to 7210/// \c To. 7211/// 7212/// This routine is used to copy/move the members of a class with an 7213/// implicitly-declared copy/move assignment operator. When the entities being 7214/// copied are arrays, this routine builds for loops to copy them. 7215/// 7216/// \param S The Sema object used for type-checking. 7217/// 7218/// \param Loc The location where the implicit copy/move is being generated. 7219/// 7220/// \param T The type of the expressions being copied/moved. Both expressions 7221/// must have this type. 7222/// 7223/// \param To The expression we are copying/moving to. 7224/// 7225/// \param From The expression we are copying/moving from. 7226/// 7227/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7228/// Otherwise, it's a non-static member subobject. 7229/// 7230/// \param Copying Whether we're copying or moving. 7231/// 7232/// \param Depth Internal parameter recording the depth of the recursion. 7233/// 7234/// \returns A statement or a loop that copies the expressions. 7235static StmtResult 7236BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7237 Expr *To, Expr *From, 7238 bool CopyingBaseSubobject, bool Copying, 7239 unsigned Depth = 0) { 7240 // C++0x [class.copy]p28: 7241 // Each subobject is assigned in the manner appropriate to its type: 7242 // 7243 // - if the subobject is of class type, as if by a call to operator= with 7244 // the subobject as the object expression and the corresponding 7245 // subobject of x as a single function argument (as if by explicit 7246 // qualification; that is, ignoring any possible virtual overriding 7247 // functions in more derived classes); 7248 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7249 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7250 7251 // Look for operator=. 7252 DeclarationName Name 7253 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7254 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7255 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7256 7257 // Filter out any result that isn't a copy/move-assignment operator. 7258 LookupResult::Filter F = OpLookup.makeFilter(); 7259 while (F.hasNext()) { 7260 NamedDecl *D = F.next(); 7261 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7262 if (Copying ? Method->isCopyAssignmentOperator() : 7263 Method->isMoveAssignmentOperator()) 7264 continue; 7265 7266 F.erase(); 7267 } 7268 F.done(); 7269 7270 // Suppress the protected check (C++ [class.protected]) for each of the 7271 // assignment operators we found. This strange dance is required when 7272 // we're assigning via a base classes's copy-assignment operator. To 7273 // ensure that we're getting the right base class subobject (without 7274 // ambiguities), we need to cast "this" to that subobject type; to 7275 // ensure that we don't go through the virtual call mechanism, we need 7276 // to qualify the operator= name with the base class (see below). However, 7277 // this means that if the base class has a protected copy assignment 7278 // operator, the protected member access check will fail. So, we 7279 // rewrite "protected" access to "public" access in this case, since we 7280 // know by construction that we're calling from a derived class. 7281 if (CopyingBaseSubobject) { 7282 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7283 L != LEnd; ++L) { 7284 if (L.getAccess() == AS_protected) 7285 L.setAccess(AS_public); 7286 } 7287 } 7288 7289 // Create the nested-name-specifier that will be used to qualify the 7290 // reference to operator=; this is required to suppress the virtual 7291 // call mechanism. 7292 CXXScopeSpec SS; 7293 SS.MakeTrivial(S.Context, 7294 NestedNameSpecifier::Create(S.Context, 0, false, 7295 T.getTypePtr()), 7296 Loc); 7297 7298 // Create the reference to operator=. 7299 ExprResult OpEqualRef 7300 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7301 /*FirstQualifierInScope=*/0, OpLookup, 7302 /*TemplateArgs=*/0, 7303 /*SuppressQualifierCheck=*/true); 7304 if (OpEqualRef.isInvalid()) 7305 return StmtError(); 7306 7307 // Build the call to the assignment operator. 7308 7309 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7310 OpEqualRef.takeAs<Expr>(), 7311 Loc, &From, 1, Loc); 7312 if (Call.isInvalid()) 7313 return StmtError(); 7314 7315 return S.Owned(Call.takeAs<Stmt>()); 7316 } 7317 7318 // - if the subobject is of scalar type, the built-in assignment 7319 // operator is used. 7320 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7321 if (!ArrayTy) { 7322 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7323 if (Assignment.isInvalid()) 7324 return StmtError(); 7325 7326 return S.Owned(Assignment.takeAs<Stmt>()); 7327 } 7328 7329 // - if the subobject is an array, each element is assigned, in the 7330 // manner appropriate to the element type; 7331 7332 // Construct a loop over the array bounds, e.g., 7333 // 7334 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7335 // 7336 // that will copy each of the array elements. 7337 QualType SizeType = S.Context.getSizeType(); 7338 7339 // Create the iteration variable. 7340 IdentifierInfo *IterationVarName = 0; 7341 { 7342 llvm::SmallString<8> Str; 7343 llvm::raw_svector_ostream OS(Str); 7344 OS << "__i" << Depth; 7345 IterationVarName = &S.Context.Idents.get(OS.str()); 7346 } 7347 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7348 IterationVarName, SizeType, 7349 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7350 SC_None, SC_None); 7351 7352 // Initialize the iteration variable to zero. 7353 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7354 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7355 7356 // Create a reference to the iteration variable; we'll use this several 7357 // times throughout. 7358 Expr *IterationVarRef 7359 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 7360 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7361 7362 // Create the DeclStmt that holds the iteration variable. 7363 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7364 7365 // Create the comparison against the array bound. 7366 llvm::APInt Upper 7367 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7368 Expr *Comparison 7369 = new (S.Context) BinaryOperator(IterationVarRef, 7370 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7371 BO_NE, S.Context.BoolTy, 7372 VK_RValue, OK_Ordinary, Loc); 7373 7374 // Create the pre-increment of the iteration variable. 7375 Expr *Increment 7376 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7377 VK_LValue, OK_Ordinary, Loc); 7378 7379 // Subscript the "from" and "to" expressions with the iteration variable. 7380 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7381 IterationVarRef, Loc)); 7382 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7383 IterationVarRef, Loc)); 7384 if (!Copying) // Cast to rvalue 7385 From = CastForMoving(S, From); 7386 7387 // Build the copy/move for an individual element of the array. 7388 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7389 To, From, CopyingBaseSubobject, 7390 Copying, Depth + 1); 7391 if (Copy.isInvalid()) 7392 return StmtError(); 7393 7394 // Construct the loop that copies all elements of this array. 7395 return S.ActOnForStmt(Loc, Loc, InitStmt, 7396 S.MakeFullExpr(Comparison), 7397 0, S.MakeFullExpr(Increment), 7398 Loc, Copy.take()); 7399} 7400 7401std::pair<Sema::ImplicitExceptionSpecification, bool> 7402Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7403 CXXRecordDecl *ClassDecl) { 7404 if (ClassDecl->isInvalidDecl()) 7405 return std::make_pair(ImplicitExceptionSpecification(Context), false); 7406 7407 // C++ [class.copy]p10: 7408 // If the class definition does not explicitly declare a copy 7409 // assignment operator, one is declared implicitly. 7410 // The implicitly-defined copy assignment operator for a class X 7411 // will have the form 7412 // 7413 // X& X::operator=(const X&) 7414 // 7415 // if 7416 bool HasConstCopyAssignment = true; 7417 7418 // -- each direct base class B of X has a copy assignment operator 7419 // whose parameter is of type const B&, const volatile B& or B, 7420 // and 7421 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7422 BaseEnd = ClassDecl->bases_end(); 7423 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7424 // We'll handle this below 7425 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7426 continue; 7427 7428 assert(!Base->getType()->isDependentType() && 7429 "Cannot generate implicit members for class with dependent bases."); 7430 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7431 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7432 &HasConstCopyAssignment); 7433 } 7434 7435 // In C++0x, the above citation has "or virtual added" 7436 if (LangOpts.CPlusPlus0x) { 7437 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7438 BaseEnd = ClassDecl->vbases_end(); 7439 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7440 assert(!Base->getType()->isDependentType() && 7441 "Cannot generate implicit members for class with dependent bases."); 7442 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7443 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7444 &HasConstCopyAssignment); 7445 } 7446 } 7447 7448 // -- for all the nonstatic data members of X that are of a class 7449 // type M (or array thereof), each such class type has a copy 7450 // assignment operator whose parameter is of type const M&, 7451 // const volatile M& or M. 7452 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7453 FieldEnd = ClassDecl->field_end(); 7454 HasConstCopyAssignment && Field != FieldEnd; 7455 ++Field) { 7456 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7457 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7458 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 7459 &HasConstCopyAssignment); 7460 } 7461 } 7462 7463 // Otherwise, the implicitly declared copy assignment operator will 7464 // have the form 7465 // 7466 // X& X::operator=(X&) 7467 7468 // C++ [except.spec]p14: 7469 // An implicitly declared special member function (Clause 12) shall have an 7470 // exception-specification. [...] 7471 7472 // It is unspecified whether or not an implicit copy assignment operator 7473 // attempts to deduplicate calls to assignment operators of virtual bases are 7474 // made. As such, this exception specification is effectively unspecified. 7475 // Based on a similar decision made for constness in C++0x, we're erring on 7476 // the side of assuming such calls to be made regardless of whether they 7477 // actually happen. 7478 ImplicitExceptionSpecification ExceptSpec(Context); 7479 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7480 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7481 BaseEnd = ClassDecl->bases_end(); 7482 Base != BaseEnd; ++Base) { 7483 if (Base->isVirtual()) 7484 continue; 7485 7486 CXXRecordDecl *BaseClassDecl 7487 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7488 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7489 ArgQuals, false, 0)) 7490 ExceptSpec.CalledDecl(CopyAssign); 7491 } 7492 7493 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7494 BaseEnd = ClassDecl->vbases_end(); 7495 Base != BaseEnd; ++Base) { 7496 CXXRecordDecl *BaseClassDecl 7497 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7498 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7499 ArgQuals, false, 0)) 7500 ExceptSpec.CalledDecl(CopyAssign); 7501 } 7502 7503 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7504 FieldEnd = ClassDecl->field_end(); 7505 Field != FieldEnd; 7506 ++Field) { 7507 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7508 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7509 if (CXXMethodDecl *CopyAssign = 7510 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7511 ExceptSpec.CalledDecl(CopyAssign); 7512 } 7513 } 7514 7515 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7516} 7517 7518CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7519 // Note: The following rules are largely analoguous to the copy 7520 // constructor rules. Note that virtual bases are not taken into account 7521 // for determining the argument type of the operator. Note also that 7522 // operators taking an object instead of a reference are allowed. 7523 7524 ImplicitExceptionSpecification Spec(Context); 7525 bool Const; 7526 llvm::tie(Spec, Const) = 7527 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7528 7529 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7530 QualType RetType = Context.getLValueReferenceType(ArgType); 7531 if (Const) 7532 ArgType = ArgType.withConst(); 7533 ArgType = Context.getLValueReferenceType(ArgType); 7534 7535 // An implicitly-declared copy assignment operator is an inline public 7536 // member of its class. 7537 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7538 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7539 SourceLocation ClassLoc = ClassDecl->getLocation(); 7540 DeclarationNameInfo NameInfo(Name, ClassLoc); 7541 CXXMethodDecl *CopyAssignment 7542 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7543 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7544 /*TInfo=*/0, /*isStatic=*/false, 7545 /*StorageClassAsWritten=*/SC_None, 7546 /*isInline=*/true, /*isConstexpr=*/false, 7547 SourceLocation()); 7548 CopyAssignment->setAccess(AS_public); 7549 CopyAssignment->setDefaulted(); 7550 CopyAssignment->setImplicit(); 7551 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7552 7553 // Add the parameter to the operator. 7554 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7555 ClassLoc, ClassLoc, /*Id=*/0, 7556 ArgType, /*TInfo=*/0, 7557 SC_None, 7558 SC_None, 0); 7559 CopyAssignment->setParams(FromParam); 7560 7561 // Note that we have added this copy-assignment operator. 7562 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7563 7564 if (Scope *S = getScopeForContext(ClassDecl)) 7565 PushOnScopeChains(CopyAssignment, S, false); 7566 ClassDecl->addDecl(CopyAssignment); 7567 7568 // C++0x [class.copy]p18: 7569 // ... If the class definition declares a move constructor or move 7570 // assignment operator, the implicitly declared copy assignment operator is 7571 // defined as deleted; ... 7572 if (ClassDecl->hasUserDeclaredMoveConstructor() || 7573 ClassDecl->hasUserDeclaredMoveAssignment() || 7574 ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 7575 CopyAssignment->setDeletedAsWritten(); 7576 7577 AddOverriddenMethods(ClassDecl, CopyAssignment); 7578 return CopyAssignment; 7579} 7580 7581void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7582 CXXMethodDecl *CopyAssignOperator) { 7583 assert((CopyAssignOperator->isDefaulted() && 7584 CopyAssignOperator->isOverloadedOperator() && 7585 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7586 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 7587 "DefineImplicitCopyAssignment called for wrong function"); 7588 7589 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7590 7591 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7592 CopyAssignOperator->setInvalidDecl(); 7593 return; 7594 } 7595 7596 CopyAssignOperator->setUsed(); 7597 7598 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7599 DiagnosticErrorTrap Trap(Diags); 7600 7601 // C++0x [class.copy]p30: 7602 // The implicitly-defined or explicitly-defaulted copy assignment operator 7603 // for a non-union class X performs memberwise copy assignment of its 7604 // subobjects. The direct base classes of X are assigned first, in the 7605 // order of their declaration in the base-specifier-list, and then the 7606 // immediate non-static data members of X are assigned, in the order in 7607 // which they were declared in the class definition. 7608 7609 // The statements that form the synthesized function body. 7610 ASTOwningVector<Stmt*> Statements(*this); 7611 7612 // The parameter for the "other" object, which we are copying from. 7613 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7614 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7615 QualType OtherRefType = Other->getType(); 7616 if (const LValueReferenceType *OtherRef 7617 = OtherRefType->getAs<LValueReferenceType>()) { 7618 OtherRefType = OtherRef->getPointeeType(); 7619 OtherQuals = OtherRefType.getQualifiers(); 7620 } 7621 7622 // Our location for everything implicitly-generated. 7623 SourceLocation Loc = CopyAssignOperator->getLocation(); 7624 7625 // Construct a reference to the "other" object. We'll be using this 7626 // throughout the generated ASTs. 7627 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7628 assert(OtherRef && "Reference to parameter cannot fail!"); 7629 7630 // Construct the "this" pointer. We'll be using this throughout the generated 7631 // ASTs. 7632 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7633 assert(This && "Reference to this cannot fail!"); 7634 7635 // Assign base classes. 7636 bool Invalid = false; 7637 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7638 E = ClassDecl->bases_end(); Base != E; ++Base) { 7639 // Form the assignment: 7640 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7641 QualType BaseType = Base->getType().getUnqualifiedType(); 7642 if (!BaseType->isRecordType()) { 7643 Invalid = true; 7644 continue; 7645 } 7646 7647 CXXCastPath BasePath; 7648 BasePath.push_back(Base); 7649 7650 // Construct the "from" expression, which is an implicit cast to the 7651 // appropriately-qualified base type. 7652 Expr *From = OtherRef; 7653 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7654 CK_UncheckedDerivedToBase, 7655 VK_LValue, &BasePath).take(); 7656 7657 // Dereference "this". 7658 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7659 7660 // Implicitly cast "this" to the appropriately-qualified base type. 7661 To = ImpCastExprToType(To.take(), 7662 Context.getCVRQualifiedType(BaseType, 7663 CopyAssignOperator->getTypeQualifiers()), 7664 CK_UncheckedDerivedToBase, 7665 VK_LValue, &BasePath); 7666 7667 // Build the copy. 7668 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7669 To.get(), From, 7670 /*CopyingBaseSubobject=*/true, 7671 /*Copying=*/true); 7672 if (Copy.isInvalid()) { 7673 Diag(CurrentLocation, diag::note_member_synthesized_at) 7674 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7675 CopyAssignOperator->setInvalidDecl(); 7676 return; 7677 } 7678 7679 // Success! Record the copy. 7680 Statements.push_back(Copy.takeAs<Expr>()); 7681 } 7682 7683 // \brief Reference to the __builtin_memcpy function. 7684 Expr *BuiltinMemCpyRef = 0; 7685 // \brief Reference to the __builtin_objc_memmove_collectable function. 7686 Expr *CollectableMemCpyRef = 0; 7687 7688 // Assign non-static members. 7689 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7690 FieldEnd = ClassDecl->field_end(); 7691 Field != FieldEnd; ++Field) { 7692 if (Field->isUnnamedBitfield()) 7693 continue; 7694 7695 // Check for members of reference type; we can't copy those. 7696 if (Field->getType()->isReferenceType()) { 7697 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7698 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7699 Diag(Field->getLocation(), diag::note_declared_at); 7700 Diag(CurrentLocation, diag::note_member_synthesized_at) 7701 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7702 Invalid = true; 7703 continue; 7704 } 7705 7706 // Check for members of const-qualified, non-class type. 7707 QualType BaseType = Context.getBaseElementType(Field->getType()); 7708 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7709 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7710 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7711 Diag(Field->getLocation(), diag::note_declared_at); 7712 Diag(CurrentLocation, diag::note_member_synthesized_at) 7713 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7714 Invalid = true; 7715 continue; 7716 } 7717 7718 // Suppress assigning zero-width bitfields. 7719 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7720 continue; 7721 7722 QualType FieldType = Field->getType().getNonReferenceType(); 7723 if (FieldType->isIncompleteArrayType()) { 7724 assert(ClassDecl->hasFlexibleArrayMember() && 7725 "Incomplete array type is not valid"); 7726 continue; 7727 } 7728 7729 // Build references to the field in the object we're copying from and to. 7730 CXXScopeSpec SS; // Intentionally empty 7731 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7732 LookupMemberName); 7733 MemberLookup.addDecl(*Field); 7734 MemberLookup.resolveKind(); 7735 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7736 Loc, /*IsArrow=*/false, 7737 SS, 0, MemberLookup, 0); 7738 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7739 Loc, /*IsArrow=*/true, 7740 SS, 0, MemberLookup, 0); 7741 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7742 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7743 7744 // If the field should be copied with __builtin_memcpy rather than via 7745 // explicit assignments, do so. This optimization only applies for arrays 7746 // of scalars and arrays of class type with trivial copy-assignment 7747 // operators. 7748 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7749 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7750 // Compute the size of the memory buffer to be copied. 7751 QualType SizeType = Context.getSizeType(); 7752 llvm::APInt Size(Context.getTypeSize(SizeType), 7753 Context.getTypeSizeInChars(BaseType).getQuantity()); 7754 for (const ConstantArrayType *Array 7755 = Context.getAsConstantArrayType(FieldType); 7756 Array; 7757 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7758 llvm::APInt ArraySize 7759 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7760 Size *= ArraySize; 7761 } 7762 7763 // Take the address of the field references for "from" and "to". 7764 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7765 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7766 7767 bool NeedsCollectableMemCpy = 7768 (BaseType->isRecordType() && 7769 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7770 7771 if (NeedsCollectableMemCpy) { 7772 if (!CollectableMemCpyRef) { 7773 // Create a reference to the __builtin_objc_memmove_collectable function. 7774 LookupResult R(*this, 7775 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7776 Loc, LookupOrdinaryName); 7777 LookupName(R, TUScope, true); 7778 7779 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7780 if (!CollectableMemCpy) { 7781 // Something went horribly wrong earlier, and we will have 7782 // complained about it. 7783 Invalid = true; 7784 continue; 7785 } 7786 7787 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7788 CollectableMemCpy->getType(), 7789 VK_LValue, Loc, 0).take(); 7790 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7791 } 7792 } 7793 // Create a reference to the __builtin_memcpy builtin function. 7794 else if (!BuiltinMemCpyRef) { 7795 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7796 LookupOrdinaryName); 7797 LookupName(R, TUScope, true); 7798 7799 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7800 if (!BuiltinMemCpy) { 7801 // Something went horribly wrong earlier, and we will have complained 7802 // about it. 7803 Invalid = true; 7804 continue; 7805 } 7806 7807 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7808 BuiltinMemCpy->getType(), 7809 VK_LValue, Loc, 0).take(); 7810 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7811 } 7812 7813 ASTOwningVector<Expr*> CallArgs(*this); 7814 CallArgs.push_back(To.takeAs<Expr>()); 7815 CallArgs.push_back(From.takeAs<Expr>()); 7816 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7817 ExprResult Call = ExprError(); 7818 if (NeedsCollectableMemCpy) 7819 Call = ActOnCallExpr(/*Scope=*/0, 7820 CollectableMemCpyRef, 7821 Loc, move_arg(CallArgs), 7822 Loc); 7823 else 7824 Call = ActOnCallExpr(/*Scope=*/0, 7825 BuiltinMemCpyRef, 7826 Loc, move_arg(CallArgs), 7827 Loc); 7828 7829 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7830 Statements.push_back(Call.takeAs<Expr>()); 7831 continue; 7832 } 7833 7834 // Build the copy of this field. 7835 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7836 To.get(), From.get(), 7837 /*CopyingBaseSubobject=*/false, 7838 /*Copying=*/true); 7839 if (Copy.isInvalid()) { 7840 Diag(CurrentLocation, diag::note_member_synthesized_at) 7841 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7842 CopyAssignOperator->setInvalidDecl(); 7843 return; 7844 } 7845 7846 // Success! Record the copy. 7847 Statements.push_back(Copy.takeAs<Stmt>()); 7848 } 7849 7850 if (!Invalid) { 7851 // Add a "return *this;" 7852 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7853 7854 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7855 if (Return.isInvalid()) 7856 Invalid = true; 7857 else { 7858 Statements.push_back(Return.takeAs<Stmt>()); 7859 7860 if (Trap.hasErrorOccurred()) { 7861 Diag(CurrentLocation, diag::note_member_synthesized_at) 7862 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7863 Invalid = true; 7864 } 7865 } 7866 } 7867 7868 if (Invalid) { 7869 CopyAssignOperator->setInvalidDecl(); 7870 return; 7871 } 7872 7873 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7874 /*isStmtExpr=*/false); 7875 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7876 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7877 7878 if (ASTMutationListener *L = getASTMutationListener()) { 7879 L->CompletedImplicitDefinition(CopyAssignOperator); 7880 } 7881} 7882 7883Sema::ImplicitExceptionSpecification 7884Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 7885 ImplicitExceptionSpecification ExceptSpec(Context); 7886 7887 if (ClassDecl->isInvalidDecl()) 7888 return ExceptSpec; 7889 7890 // C++0x [except.spec]p14: 7891 // An implicitly declared special member function (Clause 12) shall have an 7892 // exception-specification. [...] 7893 7894 // It is unspecified whether or not an implicit move assignment operator 7895 // attempts to deduplicate calls to assignment operators of virtual bases are 7896 // made. As such, this exception specification is effectively unspecified. 7897 // Based on a similar decision made for constness in C++0x, we're erring on 7898 // the side of assuming such calls to be made regardless of whether they 7899 // actually happen. 7900 // Note that a move constructor is not implicitly declared when there are 7901 // virtual bases, but it can still be user-declared and explicitly defaulted. 7902 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7903 BaseEnd = ClassDecl->bases_end(); 7904 Base != BaseEnd; ++Base) { 7905 if (Base->isVirtual()) 7906 continue; 7907 7908 CXXRecordDecl *BaseClassDecl 7909 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7910 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7911 false, 0)) 7912 ExceptSpec.CalledDecl(MoveAssign); 7913 } 7914 7915 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7916 BaseEnd = ClassDecl->vbases_end(); 7917 Base != BaseEnd; ++Base) { 7918 CXXRecordDecl *BaseClassDecl 7919 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7920 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7921 false, 0)) 7922 ExceptSpec.CalledDecl(MoveAssign); 7923 } 7924 7925 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7926 FieldEnd = ClassDecl->field_end(); 7927 Field != FieldEnd; 7928 ++Field) { 7929 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7930 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7931 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 7932 false, 0)) 7933 ExceptSpec.CalledDecl(MoveAssign); 7934 } 7935 } 7936 7937 return ExceptSpec; 7938} 7939 7940CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 7941 // Note: The following rules are largely analoguous to the move 7942 // constructor rules. 7943 7944 ImplicitExceptionSpecification Spec( 7945 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 7946 7947 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7948 QualType RetType = Context.getLValueReferenceType(ArgType); 7949 ArgType = Context.getRValueReferenceType(ArgType); 7950 7951 // An implicitly-declared move assignment operator is an inline public 7952 // member of its class. 7953 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7954 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7955 SourceLocation ClassLoc = ClassDecl->getLocation(); 7956 DeclarationNameInfo NameInfo(Name, ClassLoc); 7957 CXXMethodDecl *MoveAssignment 7958 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7959 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7960 /*TInfo=*/0, /*isStatic=*/false, 7961 /*StorageClassAsWritten=*/SC_None, 7962 /*isInline=*/true, 7963 /*isConstexpr=*/false, 7964 SourceLocation()); 7965 MoveAssignment->setAccess(AS_public); 7966 MoveAssignment->setDefaulted(); 7967 MoveAssignment->setImplicit(); 7968 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 7969 7970 // Add the parameter to the operator. 7971 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 7972 ClassLoc, ClassLoc, /*Id=*/0, 7973 ArgType, /*TInfo=*/0, 7974 SC_None, 7975 SC_None, 0); 7976 MoveAssignment->setParams(FromParam); 7977 7978 // Note that we have added this copy-assignment operator. 7979 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 7980 7981 // C++0x [class.copy]p9: 7982 // If the definition of a class X does not explicitly declare a move 7983 // assignment operator, one will be implicitly declared as defaulted if and 7984 // only if: 7985 // [...] 7986 // - the move assignment operator would not be implicitly defined as 7987 // deleted. 7988 if (ShouldDeleteMoveAssignmentOperator(MoveAssignment)) { 7989 // Cache this result so that we don't try to generate this over and over 7990 // on every lookup, leaking memory and wasting time. 7991 ClassDecl->setFailedImplicitMoveAssignment(); 7992 return 0; 7993 } 7994 7995 if (Scope *S = getScopeForContext(ClassDecl)) 7996 PushOnScopeChains(MoveAssignment, S, false); 7997 ClassDecl->addDecl(MoveAssignment); 7998 7999 AddOverriddenMethods(ClassDecl, MoveAssignment); 8000 return MoveAssignment; 8001} 8002 8003void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8004 CXXMethodDecl *MoveAssignOperator) { 8005 assert((MoveAssignOperator->isDefaulted() && 8006 MoveAssignOperator->isOverloadedOperator() && 8007 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8008 !MoveAssignOperator->doesThisDeclarationHaveABody()) && 8009 "DefineImplicitMoveAssignment called for wrong function"); 8010 8011 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8012 8013 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8014 MoveAssignOperator->setInvalidDecl(); 8015 return; 8016 } 8017 8018 MoveAssignOperator->setUsed(); 8019 8020 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8021 DiagnosticErrorTrap Trap(Diags); 8022 8023 // C++0x [class.copy]p28: 8024 // The implicitly-defined or move assignment operator for a non-union class 8025 // X performs memberwise move assignment of its subobjects. The direct base 8026 // classes of X are assigned first, in the order of their declaration in the 8027 // base-specifier-list, and then the immediate non-static data members of X 8028 // are assigned, in the order in which they were declared in the class 8029 // definition. 8030 8031 // The statements that form the synthesized function body. 8032 ASTOwningVector<Stmt*> Statements(*this); 8033 8034 // The parameter for the "other" object, which we are move from. 8035 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8036 QualType OtherRefType = Other->getType()-> 8037 getAs<RValueReferenceType>()->getPointeeType(); 8038 assert(OtherRefType.getQualifiers() == 0 && 8039 "Bad argument type of defaulted move assignment"); 8040 8041 // Our location for everything implicitly-generated. 8042 SourceLocation Loc = MoveAssignOperator->getLocation(); 8043 8044 // Construct a reference to the "other" object. We'll be using this 8045 // throughout the generated ASTs. 8046 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8047 assert(OtherRef && "Reference to parameter cannot fail!"); 8048 // Cast to rvalue. 8049 OtherRef = CastForMoving(*this, OtherRef); 8050 8051 // Construct the "this" pointer. We'll be using this throughout the generated 8052 // ASTs. 8053 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8054 assert(This && "Reference to this cannot fail!"); 8055 8056 // Assign base classes. 8057 bool Invalid = false; 8058 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8059 E = ClassDecl->bases_end(); Base != E; ++Base) { 8060 // Form the assignment: 8061 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8062 QualType BaseType = Base->getType().getUnqualifiedType(); 8063 if (!BaseType->isRecordType()) { 8064 Invalid = true; 8065 continue; 8066 } 8067 8068 CXXCastPath BasePath; 8069 BasePath.push_back(Base); 8070 8071 // Construct the "from" expression, which is an implicit cast to the 8072 // appropriately-qualified base type. 8073 Expr *From = OtherRef; 8074 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8075 VK_XValue, &BasePath).take(); 8076 8077 // Dereference "this". 8078 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8079 8080 // Implicitly cast "this" to the appropriately-qualified base type. 8081 To = ImpCastExprToType(To.take(), 8082 Context.getCVRQualifiedType(BaseType, 8083 MoveAssignOperator->getTypeQualifiers()), 8084 CK_UncheckedDerivedToBase, 8085 VK_LValue, &BasePath); 8086 8087 // Build the move. 8088 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8089 To.get(), From, 8090 /*CopyingBaseSubobject=*/true, 8091 /*Copying=*/false); 8092 if (Move.isInvalid()) { 8093 Diag(CurrentLocation, diag::note_member_synthesized_at) 8094 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8095 MoveAssignOperator->setInvalidDecl(); 8096 return; 8097 } 8098 8099 // Success! Record the move. 8100 Statements.push_back(Move.takeAs<Expr>()); 8101 } 8102 8103 // \brief Reference to the __builtin_memcpy function. 8104 Expr *BuiltinMemCpyRef = 0; 8105 // \brief Reference to the __builtin_objc_memmove_collectable function. 8106 Expr *CollectableMemCpyRef = 0; 8107 8108 // Assign non-static members. 8109 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8110 FieldEnd = ClassDecl->field_end(); 8111 Field != FieldEnd; ++Field) { 8112 if (Field->isUnnamedBitfield()) 8113 continue; 8114 8115 // Check for members of reference type; we can't move those. 8116 if (Field->getType()->isReferenceType()) { 8117 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8118 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8119 Diag(Field->getLocation(), diag::note_declared_at); 8120 Diag(CurrentLocation, diag::note_member_synthesized_at) 8121 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8122 Invalid = true; 8123 continue; 8124 } 8125 8126 // Check for members of const-qualified, non-class type. 8127 QualType BaseType = Context.getBaseElementType(Field->getType()); 8128 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8129 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8130 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8131 Diag(Field->getLocation(), diag::note_declared_at); 8132 Diag(CurrentLocation, diag::note_member_synthesized_at) 8133 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8134 Invalid = true; 8135 continue; 8136 } 8137 8138 // Suppress assigning zero-width bitfields. 8139 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8140 continue; 8141 8142 QualType FieldType = Field->getType().getNonReferenceType(); 8143 if (FieldType->isIncompleteArrayType()) { 8144 assert(ClassDecl->hasFlexibleArrayMember() && 8145 "Incomplete array type is not valid"); 8146 continue; 8147 } 8148 8149 // Build references to the field in the object we're copying from and to. 8150 CXXScopeSpec SS; // Intentionally empty 8151 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8152 LookupMemberName); 8153 MemberLookup.addDecl(*Field); 8154 MemberLookup.resolveKind(); 8155 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8156 Loc, /*IsArrow=*/false, 8157 SS, 0, MemberLookup, 0); 8158 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8159 Loc, /*IsArrow=*/true, 8160 SS, 0, MemberLookup, 0); 8161 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8162 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8163 8164 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8165 "Member reference with rvalue base must be rvalue except for reference " 8166 "members, which aren't allowed for move assignment."); 8167 8168 // If the field should be copied with __builtin_memcpy rather than via 8169 // explicit assignments, do so. This optimization only applies for arrays 8170 // of scalars and arrays of class type with trivial move-assignment 8171 // operators. 8172 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8173 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8174 // Compute the size of the memory buffer to be copied. 8175 QualType SizeType = Context.getSizeType(); 8176 llvm::APInt Size(Context.getTypeSize(SizeType), 8177 Context.getTypeSizeInChars(BaseType).getQuantity()); 8178 for (const ConstantArrayType *Array 8179 = Context.getAsConstantArrayType(FieldType); 8180 Array; 8181 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8182 llvm::APInt ArraySize 8183 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8184 Size *= ArraySize; 8185 } 8186 8187 // Take the address of the field references for "from" and "to". We 8188 // directly construct UnaryOperators here because semantic analysis 8189 // does not permit us to take the address of an xvalue. 8190 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8191 Context.getPointerType(From.get()->getType()), 8192 VK_RValue, OK_Ordinary, Loc); 8193 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8194 Context.getPointerType(To.get()->getType()), 8195 VK_RValue, OK_Ordinary, Loc); 8196 8197 bool NeedsCollectableMemCpy = 8198 (BaseType->isRecordType() && 8199 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8200 8201 if (NeedsCollectableMemCpy) { 8202 if (!CollectableMemCpyRef) { 8203 // Create a reference to the __builtin_objc_memmove_collectable function. 8204 LookupResult R(*this, 8205 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8206 Loc, LookupOrdinaryName); 8207 LookupName(R, TUScope, true); 8208 8209 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8210 if (!CollectableMemCpy) { 8211 // Something went horribly wrong earlier, and we will have 8212 // complained about it. 8213 Invalid = true; 8214 continue; 8215 } 8216 8217 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8218 CollectableMemCpy->getType(), 8219 VK_LValue, Loc, 0).take(); 8220 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8221 } 8222 } 8223 // Create a reference to the __builtin_memcpy builtin function. 8224 else if (!BuiltinMemCpyRef) { 8225 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8226 LookupOrdinaryName); 8227 LookupName(R, TUScope, true); 8228 8229 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8230 if (!BuiltinMemCpy) { 8231 // Something went horribly wrong earlier, and we will have complained 8232 // about it. 8233 Invalid = true; 8234 continue; 8235 } 8236 8237 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8238 BuiltinMemCpy->getType(), 8239 VK_LValue, Loc, 0).take(); 8240 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8241 } 8242 8243 ASTOwningVector<Expr*> CallArgs(*this); 8244 CallArgs.push_back(To.takeAs<Expr>()); 8245 CallArgs.push_back(From.takeAs<Expr>()); 8246 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8247 ExprResult Call = ExprError(); 8248 if (NeedsCollectableMemCpy) 8249 Call = ActOnCallExpr(/*Scope=*/0, 8250 CollectableMemCpyRef, 8251 Loc, move_arg(CallArgs), 8252 Loc); 8253 else 8254 Call = ActOnCallExpr(/*Scope=*/0, 8255 BuiltinMemCpyRef, 8256 Loc, move_arg(CallArgs), 8257 Loc); 8258 8259 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8260 Statements.push_back(Call.takeAs<Expr>()); 8261 continue; 8262 } 8263 8264 // Build the move of this field. 8265 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8266 To.get(), From.get(), 8267 /*CopyingBaseSubobject=*/false, 8268 /*Copying=*/false); 8269 if (Move.isInvalid()) { 8270 Diag(CurrentLocation, diag::note_member_synthesized_at) 8271 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8272 MoveAssignOperator->setInvalidDecl(); 8273 return; 8274 } 8275 8276 // Success! Record the copy. 8277 Statements.push_back(Move.takeAs<Stmt>()); 8278 } 8279 8280 if (!Invalid) { 8281 // Add a "return *this;" 8282 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8283 8284 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8285 if (Return.isInvalid()) 8286 Invalid = true; 8287 else { 8288 Statements.push_back(Return.takeAs<Stmt>()); 8289 8290 if (Trap.hasErrorOccurred()) { 8291 Diag(CurrentLocation, diag::note_member_synthesized_at) 8292 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8293 Invalid = true; 8294 } 8295 } 8296 } 8297 8298 if (Invalid) { 8299 MoveAssignOperator->setInvalidDecl(); 8300 return; 8301 } 8302 8303 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8304 /*isStmtExpr=*/false); 8305 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8306 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8307 8308 if (ASTMutationListener *L = getASTMutationListener()) { 8309 L->CompletedImplicitDefinition(MoveAssignOperator); 8310 } 8311} 8312 8313std::pair<Sema::ImplicitExceptionSpecification, bool> 8314Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8315 if (ClassDecl->isInvalidDecl()) 8316 return std::make_pair(ImplicitExceptionSpecification(Context), false); 8317 8318 // C++ [class.copy]p5: 8319 // The implicitly-declared copy constructor for a class X will 8320 // have the form 8321 // 8322 // X::X(const X&) 8323 // 8324 // if 8325 // FIXME: It ought to be possible to store this on the record. 8326 bool HasConstCopyConstructor = true; 8327 8328 // -- each direct or virtual base class B of X has a copy 8329 // constructor whose first parameter is of type const B& or 8330 // const volatile B&, and 8331 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8332 BaseEnd = ClassDecl->bases_end(); 8333 HasConstCopyConstructor && Base != BaseEnd; 8334 ++Base) { 8335 // Virtual bases are handled below. 8336 if (Base->isVirtual()) 8337 continue; 8338 8339 CXXRecordDecl *BaseClassDecl 8340 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8341 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8342 &HasConstCopyConstructor); 8343 } 8344 8345 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8346 BaseEnd = ClassDecl->vbases_end(); 8347 HasConstCopyConstructor && Base != BaseEnd; 8348 ++Base) { 8349 CXXRecordDecl *BaseClassDecl 8350 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8351 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8352 &HasConstCopyConstructor); 8353 } 8354 8355 // -- for all the nonstatic data members of X that are of a 8356 // class type M (or array thereof), each such class type 8357 // has a copy constructor whose first parameter is of type 8358 // const M& or const volatile M&. 8359 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8360 FieldEnd = ClassDecl->field_end(); 8361 HasConstCopyConstructor && Field != FieldEnd; 8362 ++Field) { 8363 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8364 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8365 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 8366 &HasConstCopyConstructor); 8367 } 8368 } 8369 // Otherwise, the implicitly declared copy constructor will have 8370 // the form 8371 // 8372 // X::X(X&) 8373 8374 // C++ [except.spec]p14: 8375 // An implicitly declared special member function (Clause 12) shall have an 8376 // exception-specification. [...] 8377 ImplicitExceptionSpecification ExceptSpec(Context); 8378 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8379 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8380 BaseEnd = ClassDecl->bases_end(); 8381 Base != BaseEnd; 8382 ++Base) { 8383 // Virtual bases are handled below. 8384 if (Base->isVirtual()) 8385 continue; 8386 8387 CXXRecordDecl *BaseClassDecl 8388 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8389 if (CXXConstructorDecl *CopyConstructor = 8390 LookupCopyingConstructor(BaseClassDecl, Quals)) 8391 ExceptSpec.CalledDecl(CopyConstructor); 8392 } 8393 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8394 BaseEnd = ClassDecl->vbases_end(); 8395 Base != BaseEnd; 8396 ++Base) { 8397 CXXRecordDecl *BaseClassDecl 8398 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8399 if (CXXConstructorDecl *CopyConstructor = 8400 LookupCopyingConstructor(BaseClassDecl, Quals)) 8401 ExceptSpec.CalledDecl(CopyConstructor); 8402 } 8403 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8404 FieldEnd = ClassDecl->field_end(); 8405 Field != FieldEnd; 8406 ++Field) { 8407 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8408 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8409 if (CXXConstructorDecl *CopyConstructor = 8410 LookupCopyingConstructor(FieldClassDecl, Quals)) 8411 ExceptSpec.CalledDecl(CopyConstructor); 8412 } 8413 } 8414 8415 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8416} 8417 8418CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8419 CXXRecordDecl *ClassDecl) { 8420 // C++ [class.copy]p4: 8421 // If the class definition does not explicitly declare a copy 8422 // constructor, one is declared implicitly. 8423 8424 ImplicitExceptionSpecification Spec(Context); 8425 bool Const; 8426 llvm::tie(Spec, Const) = 8427 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8428 8429 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8430 QualType ArgType = ClassType; 8431 if (Const) 8432 ArgType = ArgType.withConst(); 8433 ArgType = Context.getLValueReferenceType(ArgType); 8434 8435 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8436 8437 DeclarationName Name 8438 = Context.DeclarationNames.getCXXConstructorName( 8439 Context.getCanonicalType(ClassType)); 8440 SourceLocation ClassLoc = ClassDecl->getLocation(); 8441 DeclarationNameInfo NameInfo(Name, ClassLoc); 8442 8443 // An implicitly-declared copy constructor is an inline public 8444 // member of its class. 8445 CXXConstructorDecl *CopyConstructor 8446 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8447 Context.getFunctionType(Context.VoidTy, 8448 &ArgType, 1, EPI), 8449 /*TInfo=*/0, 8450 /*isExplicit=*/false, 8451 /*isInline=*/true, 8452 /*isImplicitlyDeclared=*/true, 8453 // FIXME: apply the rules for definitions here 8454 /*isConstexpr=*/false); 8455 CopyConstructor->setAccess(AS_public); 8456 CopyConstructor->setDefaulted(); 8457 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8458 8459 // Note that we have declared this constructor. 8460 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8461 8462 // Add the parameter to the constructor. 8463 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8464 ClassLoc, ClassLoc, 8465 /*IdentifierInfo=*/0, 8466 ArgType, /*TInfo=*/0, 8467 SC_None, 8468 SC_None, 0); 8469 CopyConstructor->setParams(FromParam); 8470 8471 if (Scope *S = getScopeForContext(ClassDecl)) 8472 PushOnScopeChains(CopyConstructor, S, false); 8473 ClassDecl->addDecl(CopyConstructor); 8474 8475 // C++0x [class.copy]p7: 8476 // ... If the class definition declares a move constructor or move 8477 // assignment operator, the implicitly declared constructor is defined as 8478 // deleted; ... 8479 if (ClassDecl->hasUserDeclaredMoveConstructor() || 8480 ClassDecl->hasUserDeclaredMoveAssignment() || 8481 ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8482 CopyConstructor->setDeletedAsWritten(); 8483 8484 return CopyConstructor; 8485} 8486 8487void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8488 CXXConstructorDecl *CopyConstructor) { 8489 assert((CopyConstructor->isDefaulted() && 8490 CopyConstructor->isCopyConstructor() && 8491 !CopyConstructor->doesThisDeclarationHaveABody()) && 8492 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8493 8494 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8495 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8496 8497 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8498 DiagnosticErrorTrap Trap(Diags); 8499 8500 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8501 Trap.hasErrorOccurred()) { 8502 Diag(CurrentLocation, diag::note_member_synthesized_at) 8503 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8504 CopyConstructor->setInvalidDecl(); 8505 } else { 8506 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8507 CopyConstructor->getLocation(), 8508 MultiStmtArg(*this, 0, 0), 8509 /*isStmtExpr=*/false) 8510 .takeAs<Stmt>()); 8511 CopyConstructor->setImplicitlyDefined(true); 8512 } 8513 8514 CopyConstructor->setUsed(); 8515 if (ASTMutationListener *L = getASTMutationListener()) { 8516 L->CompletedImplicitDefinition(CopyConstructor); 8517 } 8518} 8519 8520Sema::ImplicitExceptionSpecification 8521Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8522 // C++ [except.spec]p14: 8523 // An implicitly declared special member function (Clause 12) shall have an 8524 // exception-specification. [...] 8525 ImplicitExceptionSpecification ExceptSpec(Context); 8526 if (ClassDecl->isInvalidDecl()) 8527 return ExceptSpec; 8528 8529 // Direct base-class constructors. 8530 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8531 BEnd = ClassDecl->bases_end(); 8532 B != BEnd; ++B) { 8533 if (B->isVirtual()) // Handled below. 8534 continue; 8535 8536 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8537 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8538 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8539 // If this is a deleted function, add it anyway. This might be conformant 8540 // with the standard. This might not. I'm not sure. It might not matter. 8541 if (Constructor) 8542 ExceptSpec.CalledDecl(Constructor); 8543 } 8544 } 8545 8546 // Virtual base-class constructors. 8547 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8548 BEnd = ClassDecl->vbases_end(); 8549 B != BEnd; ++B) { 8550 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8551 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8552 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8553 // If this is a deleted function, add it anyway. This might be conformant 8554 // with the standard. This might not. I'm not sure. It might not matter. 8555 if (Constructor) 8556 ExceptSpec.CalledDecl(Constructor); 8557 } 8558 } 8559 8560 // Field constructors. 8561 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8562 FEnd = ClassDecl->field_end(); 8563 F != FEnd; ++F) { 8564 if (F->hasInClassInitializer()) { 8565 if (Expr *E = F->getInClassInitializer()) 8566 ExceptSpec.CalledExpr(E); 8567 else if (!F->isInvalidDecl()) 8568 ExceptSpec.SetDelayed(); 8569 } else if (const RecordType *RecordTy 8570 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8571 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8572 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8573 // If this is a deleted function, add it anyway. This might be conformant 8574 // with the standard. This might not. I'm not sure. It might not matter. 8575 // In particular, the problem is that this function never gets called. It 8576 // might just be ill-formed because this function attempts to refer to 8577 // a deleted function here. 8578 if (Constructor) 8579 ExceptSpec.CalledDecl(Constructor); 8580 } 8581 } 8582 8583 return ExceptSpec; 8584} 8585 8586CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8587 CXXRecordDecl *ClassDecl) { 8588 ImplicitExceptionSpecification Spec( 8589 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8590 8591 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8592 QualType ArgType = Context.getRValueReferenceType(ClassType); 8593 8594 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8595 8596 DeclarationName Name 8597 = Context.DeclarationNames.getCXXConstructorName( 8598 Context.getCanonicalType(ClassType)); 8599 SourceLocation ClassLoc = ClassDecl->getLocation(); 8600 DeclarationNameInfo NameInfo(Name, ClassLoc); 8601 8602 // C++0x [class.copy]p11: 8603 // An implicitly-declared copy/move constructor is an inline public 8604 // member of its class. 8605 CXXConstructorDecl *MoveConstructor 8606 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8607 Context.getFunctionType(Context.VoidTy, 8608 &ArgType, 1, EPI), 8609 /*TInfo=*/0, 8610 /*isExplicit=*/false, 8611 /*isInline=*/true, 8612 /*isImplicitlyDeclared=*/true, 8613 // FIXME: apply the rules for definitions here 8614 /*isConstexpr=*/false); 8615 MoveConstructor->setAccess(AS_public); 8616 MoveConstructor->setDefaulted(); 8617 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8618 8619 // Add the parameter to the constructor. 8620 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8621 ClassLoc, ClassLoc, 8622 /*IdentifierInfo=*/0, 8623 ArgType, /*TInfo=*/0, 8624 SC_None, 8625 SC_None, 0); 8626 MoveConstructor->setParams(FromParam); 8627 8628 // C++0x [class.copy]p9: 8629 // If the definition of a class X does not explicitly declare a move 8630 // constructor, one will be implicitly declared as defaulted if and only if: 8631 // [...] 8632 // - the move constructor would not be implicitly defined as deleted. 8633 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8634 // Cache this result so that we don't try to generate this over and over 8635 // on every lookup, leaking memory and wasting time. 8636 ClassDecl->setFailedImplicitMoveConstructor(); 8637 return 0; 8638 } 8639 8640 // Note that we have declared this constructor. 8641 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8642 8643 if (Scope *S = getScopeForContext(ClassDecl)) 8644 PushOnScopeChains(MoveConstructor, S, false); 8645 ClassDecl->addDecl(MoveConstructor); 8646 8647 return MoveConstructor; 8648} 8649 8650void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8651 CXXConstructorDecl *MoveConstructor) { 8652 assert((MoveConstructor->isDefaulted() && 8653 MoveConstructor->isMoveConstructor() && 8654 !MoveConstructor->doesThisDeclarationHaveABody()) && 8655 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8656 8657 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8658 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8659 8660 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8661 DiagnosticErrorTrap Trap(Diags); 8662 8663 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8664 Trap.hasErrorOccurred()) { 8665 Diag(CurrentLocation, diag::note_member_synthesized_at) 8666 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8667 MoveConstructor->setInvalidDecl(); 8668 } else { 8669 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8670 MoveConstructor->getLocation(), 8671 MultiStmtArg(*this, 0, 0), 8672 /*isStmtExpr=*/false) 8673 .takeAs<Stmt>()); 8674 MoveConstructor->setImplicitlyDefined(true); 8675 } 8676 8677 MoveConstructor->setUsed(); 8678 8679 if (ASTMutationListener *L = getASTMutationListener()) { 8680 L->CompletedImplicitDefinition(MoveConstructor); 8681 } 8682} 8683 8684ExprResult 8685Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8686 CXXConstructorDecl *Constructor, 8687 MultiExprArg ExprArgs, 8688 bool HadMultipleCandidates, 8689 bool RequiresZeroInit, 8690 unsigned ConstructKind, 8691 SourceRange ParenRange) { 8692 bool Elidable = false; 8693 8694 // C++0x [class.copy]p34: 8695 // When certain criteria are met, an implementation is allowed to 8696 // omit the copy/move construction of a class object, even if the 8697 // copy/move constructor and/or destructor for the object have 8698 // side effects. [...] 8699 // - when a temporary class object that has not been bound to a 8700 // reference (12.2) would be copied/moved to a class object 8701 // with the same cv-unqualified type, the copy/move operation 8702 // can be omitted by constructing the temporary object 8703 // directly into the target of the omitted copy/move 8704 if (ConstructKind == CXXConstructExpr::CK_Complete && 8705 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 8706 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 8707 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 8708 } 8709 8710 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 8711 Elidable, move(ExprArgs), HadMultipleCandidates, 8712 RequiresZeroInit, ConstructKind, ParenRange); 8713} 8714 8715/// BuildCXXConstructExpr - Creates a complete call to a constructor, 8716/// including handling of its default argument expressions. 8717ExprResult 8718Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8719 CXXConstructorDecl *Constructor, bool Elidable, 8720 MultiExprArg ExprArgs, 8721 bool HadMultipleCandidates, 8722 bool RequiresZeroInit, 8723 unsigned ConstructKind, 8724 SourceRange ParenRange) { 8725 unsigned NumExprs = ExprArgs.size(); 8726 Expr **Exprs = (Expr **)ExprArgs.release(); 8727 8728 for (specific_attr_iterator<NonNullAttr> 8729 i = Constructor->specific_attr_begin<NonNullAttr>(), 8730 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 8731 const NonNullAttr *NonNull = *i; 8732 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 8733 } 8734 8735 MarkDeclarationReferenced(ConstructLoc, Constructor); 8736 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 8737 Constructor, Elidable, Exprs, NumExprs, 8738 HadMultipleCandidates, RequiresZeroInit, 8739 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 8740 ParenRange)); 8741} 8742 8743bool Sema::InitializeVarWithConstructor(VarDecl *VD, 8744 CXXConstructorDecl *Constructor, 8745 MultiExprArg Exprs, 8746 bool HadMultipleCandidates) { 8747 // FIXME: Provide the correct paren SourceRange when available. 8748 ExprResult TempResult = 8749 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 8750 move(Exprs), HadMultipleCandidates, false, 8751 CXXConstructExpr::CK_Complete, SourceRange()); 8752 if (TempResult.isInvalid()) 8753 return true; 8754 8755 Expr *Temp = TempResult.takeAs<Expr>(); 8756 CheckImplicitConversions(Temp, VD->getLocation()); 8757 MarkDeclarationReferenced(VD->getLocation(), Constructor); 8758 Temp = MaybeCreateExprWithCleanups(Temp); 8759 VD->setInit(Temp); 8760 8761 return false; 8762} 8763 8764void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 8765 if (VD->isInvalidDecl()) return; 8766 8767 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 8768 if (ClassDecl->isInvalidDecl()) return; 8769 if (ClassDecl->hasTrivialDestructor()) return; 8770 if (ClassDecl->isDependentContext()) return; 8771 8772 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 8773 MarkDeclarationReferenced(VD->getLocation(), Destructor); 8774 CheckDestructorAccess(VD->getLocation(), Destructor, 8775 PDiag(diag::err_access_dtor_var) 8776 << VD->getDeclName() 8777 << VD->getType()); 8778 8779 if (!VD->hasGlobalStorage()) return; 8780 8781 // Emit warning for non-trivial dtor in global scope (a real global, 8782 // class-static, function-static). 8783 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 8784 8785 // TODO: this should be re-enabled for static locals by !CXAAtExit 8786 if (!VD->isStaticLocal()) 8787 Diag(VD->getLocation(), diag::warn_global_destructor); 8788} 8789 8790/// AddCXXDirectInitializerToDecl - This action is called immediately after 8791/// ActOnDeclarator, when a C++ direct initializer is present. 8792/// e.g: "int x(1);" 8793void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 8794 SourceLocation LParenLoc, 8795 MultiExprArg Exprs, 8796 SourceLocation RParenLoc, 8797 bool TypeMayContainAuto) { 8798 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 8799 8800 // If there is no declaration, there was an error parsing it. Just ignore 8801 // the initializer. 8802 if (RealDecl == 0) 8803 return; 8804 8805 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 8806 if (!VDecl) { 8807 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 8808 RealDecl->setInvalidDecl(); 8809 return; 8810 } 8811 8812 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 8813 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 8814 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 8815 if (Exprs.size() > 1) { 8816 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 8817 diag::err_auto_var_init_multiple_expressions) 8818 << VDecl->getDeclName() << VDecl->getType() 8819 << VDecl->getSourceRange(); 8820 RealDecl->setInvalidDecl(); 8821 return; 8822 } 8823 8824 Expr *Init = Exprs.get()[0]; 8825 TypeSourceInfo *DeducedType = 0; 8826 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 8827 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 8828 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 8829 << Init->getSourceRange(); 8830 if (!DeducedType) { 8831 RealDecl->setInvalidDecl(); 8832 return; 8833 } 8834 VDecl->setTypeSourceInfo(DeducedType); 8835 VDecl->setType(DeducedType->getType()); 8836 8837 // In ARC, infer lifetime. 8838 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 8839 VDecl->setInvalidDecl(); 8840 8841 // If this is a redeclaration, check that the type we just deduced matches 8842 // the previously declared type. 8843 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 8844 MergeVarDeclTypes(VDecl, Old); 8845 } 8846 8847 // We will represent direct-initialization similarly to copy-initialization: 8848 // int x(1); -as-> int x = 1; 8849 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 8850 // 8851 // Clients that want to distinguish between the two forms, can check for 8852 // direct initializer using VarDecl::hasCXXDirectInitializer(). 8853 // A major benefit is that clients that don't particularly care about which 8854 // exactly form was it (like the CodeGen) can handle both cases without 8855 // special case code. 8856 8857 // C++ 8.5p11: 8858 // The form of initialization (using parentheses or '=') is generally 8859 // insignificant, but does matter when the entity being initialized has a 8860 // class type. 8861 8862 if (!VDecl->getType()->isDependentType() && 8863 !VDecl->getType()->isIncompleteArrayType() && 8864 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 8865 diag::err_typecheck_decl_incomplete_type)) { 8866 VDecl->setInvalidDecl(); 8867 return; 8868 } 8869 8870 // The variable can not have an abstract class type. 8871 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 8872 diag::err_abstract_type_in_decl, 8873 AbstractVariableType)) 8874 VDecl->setInvalidDecl(); 8875 8876 const VarDecl *Def; 8877 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 8878 Diag(VDecl->getLocation(), diag::err_redefinition) 8879 << VDecl->getDeclName(); 8880 Diag(Def->getLocation(), diag::note_previous_definition); 8881 VDecl->setInvalidDecl(); 8882 return; 8883 } 8884 8885 // C++ [class.static.data]p4 8886 // If a static data member is of const integral or const 8887 // enumeration type, its declaration in the class definition can 8888 // specify a constant-initializer which shall be an integral 8889 // constant expression (5.19). In that case, the member can appear 8890 // in integral constant expressions. The member shall still be 8891 // defined in a namespace scope if it is used in the program and the 8892 // namespace scope definition shall not contain an initializer. 8893 // 8894 // We already performed a redefinition check above, but for static 8895 // data members we also need to check whether there was an in-class 8896 // declaration with an initializer. 8897 const VarDecl* PrevInit = 0; 8898 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 8899 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 8900 Diag(PrevInit->getLocation(), diag::note_previous_definition); 8901 return; 8902 } 8903 8904 bool IsDependent = false; 8905 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 8906 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 8907 VDecl->setInvalidDecl(); 8908 return; 8909 } 8910 8911 if (Exprs.get()[I]->isTypeDependent()) 8912 IsDependent = true; 8913 } 8914 8915 // If either the declaration has a dependent type or if any of the 8916 // expressions is type-dependent, we represent the initialization 8917 // via a ParenListExpr for later use during template instantiation. 8918 if (VDecl->getType()->isDependentType() || IsDependent) { 8919 // Let clients know that initialization was done with a direct initializer. 8920 VDecl->setCXXDirectInitializer(true); 8921 8922 // Store the initialization expressions as a ParenListExpr. 8923 unsigned NumExprs = Exprs.size(); 8924 VDecl->setInit(new (Context) ParenListExpr( 8925 Context, LParenLoc, (Expr **)Exprs.release(), NumExprs, RParenLoc, 8926 VDecl->getType().getNonReferenceType())); 8927 return; 8928 } 8929 8930 // Capture the variable that is being initialized and the style of 8931 // initialization. 8932 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 8933 8934 // FIXME: Poor source location information. 8935 InitializationKind Kind 8936 = InitializationKind::CreateDirect(VDecl->getLocation(), 8937 LParenLoc, RParenLoc); 8938 8939 QualType T = VDecl->getType(); 8940 InitializationSequence InitSeq(*this, Entity, Kind, 8941 Exprs.get(), Exprs.size()); 8942 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs), &T); 8943 if (Result.isInvalid()) { 8944 VDecl->setInvalidDecl(); 8945 return; 8946 } else if (T != VDecl->getType()) { 8947 VDecl->setType(T); 8948 Result.get()->setType(T); 8949 } 8950 8951 8952 Expr *Init = Result.get(); 8953 CheckImplicitConversions(Init, LParenLoc); 8954 8955 if (VDecl->isConstexpr() && !VDecl->isInvalidDecl() && 8956 !Init->isValueDependent() && 8957 !Init->isConstantInitializer(Context, 8958 VDecl->getType()->isReferenceType())) { 8959 // FIXME: Improve this diagnostic to explain why the initializer is not 8960 // a constant expression. 8961 Diag(VDecl->getLocation(), diag::err_constexpr_var_requires_const_init) 8962 << VDecl << Init->getSourceRange(); 8963 } 8964 8965 Init = MaybeCreateExprWithCleanups(Init); 8966 VDecl->setInit(Init); 8967 VDecl->setCXXDirectInitializer(true); 8968 8969 CheckCompleteVariableDeclaration(VDecl); 8970} 8971 8972/// \brief Given a constructor and the set of arguments provided for the 8973/// constructor, convert the arguments and add any required default arguments 8974/// to form a proper call to this constructor. 8975/// 8976/// \returns true if an error occurred, false otherwise. 8977bool 8978Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 8979 MultiExprArg ArgsPtr, 8980 SourceLocation Loc, 8981 ASTOwningVector<Expr*> &ConvertedArgs) { 8982 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 8983 unsigned NumArgs = ArgsPtr.size(); 8984 Expr **Args = (Expr **)ArgsPtr.get(); 8985 8986 const FunctionProtoType *Proto 8987 = Constructor->getType()->getAs<FunctionProtoType>(); 8988 assert(Proto && "Constructor without a prototype?"); 8989 unsigned NumArgsInProto = Proto->getNumArgs(); 8990 8991 // If too few arguments are available, we'll fill in the rest with defaults. 8992 if (NumArgs < NumArgsInProto) 8993 ConvertedArgs.reserve(NumArgsInProto); 8994 else 8995 ConvertedArgs.reserve(NumArgs); 8996 8997 VariadicCallType CallType = 8998 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 8999 SmallVector<Expr *, 8> AllArgs; 9000 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9001 Proto, 0, Args, NumArgs, AllArgs, 9002 CallType); 9003 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 9004 ConvertedArgs.push_back(AllArgs[i]); 9005 return Invalid; 9006} 9007 9008static inline bool 9009CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9010 const FunctionDecl *FnDecl) { 9011 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9012 if (isa<NamespaceDecl>(DC)) { 9013 return SemaRef.Diag(FnDecl->getLocation(), 9014 diag::err_operator_new_delete_declared_in_namespace) 9015 << FnDecl->getDeclName(); 9016 } 9017 9018 if (isa<TranslationUnitDecl>(DC) && 9019 FnDecl->getStorageClass() == SC_Static) { 9020 return SemaRef.Diag(FnDecl->getLocation(), 9021 diag::err_operator_new_delete_declared_static) 9022 << FnDecl->getDeclName(); 9023 } 9024 9025 return false; 9026} 9027 9028static inline bool 9029CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9030 CanQualType ExpectedResultType, 9031 CanQualType ExpectedFirstParamType, 9032 unsigned DependentParamTypeDiag, 9033 unsigned InvalidParamTypeDiag) { 9034 QualType ResultType = 9035 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9036 9037 // Check that the result type is not dependent. 9038 if (ResultType->isDependentType()) 9039 return SemaRef.Diag(FnDecl->getLocation(), 9040 diag::err_operator_new_delete_dependent_result_type) 9041 << FnDecl->getDeclName() << ExpectedResultType; 9042 9043 // Check that the result type is what we expect. 9044 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9045 return SemaRef.Diag(FnDecl->getLocation(), 9046 diag::err_operator_new_delete_invalid_result_type) 9047 << FnDecl->getDeclName() << ExpectedResultType; 9048 9049 // A function template must have at least 2 parameters. 9050 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9051 return SemaRef.Diag(FnDecl->getLocation(), 9052 diag::err_operator_new_delete_template_too_few_parameters) 9053 << FnDecl->getDeclName(); 9054 9055 // The function decl must have at least 1 parameter. 9056 if (FnDecl->getNumParams() == 0) 9057 return SemaRef.Diag(FnDecl->getLocation(), 9058 diag::err_operator_new_delete_too_few_parameters) 9059 << FnDecl->getDeclName(); 9060 9061 // Check the the first parameter type is not dependent. 9062 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9063 if (FirstParamType->isDependentType()) 9064 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9065 << FnDecl->getDeclName() << ExpectedFirstParamType; 9066 9067 // Check that the first parameter type is what we expect. 9068 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9069 ExpectedFirstParamType) 9070 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9071 << FnDecl->getDeclName() << ExpectedFirstParamType; 9072 9073 return false; 9074} 9075 9076static bool 9077CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9078 // C++ [basic.stc.dynamic.allocation]p1: 9079 // A program is ill-formed if an allocation function is declared in a 9080 // namespace scope other than global scope or declared static in global 9081 // scope. 9082 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9083 return true; 9084 9085 CanQualType SizeTy = 9086 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9087 9088 // C++ [basic.stc.dynamic.allocation]p1: 9089 // The return type shall be void*. The first parameter shall have type 9090 // std::size_t. 9091 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9092 SizeTy, 9093 diag::err_operator_new_dependent_param_type, 9094 diag::err_operator_new_param_type)) 9095 return true; 9096 9097 // C++ [basic.stc.dynamic.allocation]p1: 9098 // The first parameter shall not have an associated default argument. 9099 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9100 return SemaRef.Diag(FnDecl->getLocation(), 9101 diag::err_operator_new_default_arg) 9102 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9103 9104 return false; 9105} 9106 9107static bool 9108CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9109 // C++ [basic.stc.dynamic.deallocation]p1: 9110 // A program is ill-formed if deallocation functions are declared in a 9111 // namespace scope other than global scope or declared static in global 9112 // scope. 9113 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9114 return true; 9115 9116 // C++ [basic.stc.dynamic.deallocation]p2: 9117 // Each deallocation function shall return void and its first parameter 9118 // shall be void*. 9119 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9120 SemaRef.Context.VoidPtrTy, 9121 diag::err_operator_delete_dependent_param_type, 9122 diag::err_operator_delete_param_type)) 9123 return true; 9124 9125 return false; 9126} 9127 9128/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9129/// of this overloaded operator is well-formed. If so, returns false; 9130/// otherwise, emits appropriate diagnostics and returns true. 9131bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9132 assert(FnDecl && FnDecl->isOverloadedOperator() && 9133 "Expected an overloaded operator declaration"); 9134 9135 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9136 9137 // C++ [over.oper]p5: 9138 // The allocation and deallocation functions, operator new, 9139 // operator new[], operator delete and operator delete[], are 9140 // described completely in 3.7.3. The attributes and restrictions 9141 // found in the rest of this subclause do not apply to them unless 9142 // explicitly stated in 3.7.3. 9143 if (Op == OO_Delete || Op == OO_Array_Delete) 9144 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9145 9146 if (Op == OO_New || Op == OO_Array_New) 9147 return CheckOperatorNewDeclaration(*this, FnDecl); 9148 9149 // C++ [over.oper]p6: 9150 // An operator function shall either be a non-static member 9151 // function or be a non-member function and have at least one 9152 // parameter whose type is a class, a reference to a class, an 9153 // enumeration, or a reference to an enumeration. 9154 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9155 if (MethodDecl->isStatic()) 9156 return Diag(FnDecl->getLocation(), 9157 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9158 } else { 9159 bool ClassOrEnumParam = false; 9160 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9161 ParamEnd = FnDecl->param_end(); 9162 Param != ParamEnd; ++Param) { 9163 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9164 if (ParamType->isDependentType() || ParamType->isRecordType() || 9165 ParamType->isEnumeralType()) { 9166 ClassOrEnumParam = true; 9167 break; 9168 } 9169 } 9170 9171 if (!ClassOrEnumParam) 9172 return Diag(FnDecl->getLocation(), 9173 diag::err_operator_overload_needs_class_or_enum) 9174 << FnDecl->getDeclName(); 9175 } 9176 9177 // C++ [over.oper]p8: 9178 // An operator function cannot have default arguments (8.3.6), 9179 // except where explicitly stated below. 9180 // 9181 // Only the function-call operator allows default arguments 9182 // (C++ [over.call]p1). 9183 if (Op != OO_Call) { 9184 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9185 Param != FnDecl->param_end(); ++Param) { 9186 if ((*Param)->hasDefaultArg()) 9187 return Diag((*Param)->getLocation(), 9188 diag::err_operator_overload_default_arg) 9189 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9190 } 9191 } 9192 9193 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9194 { false, false, false } 9195#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9196 , { Unary, Binary, MemberOnly } 9197#include "clang/Basic/OperatorKinds.def" 9198 }; 9199 9200 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9201 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9202 bool MustBeMemberOperator = OperatorUses[Op][2]; 9203 9204 // C++ [over.oper]p8: 9205 // [...] Operator functions cannot have more or fewer parameters 9206 // than the number required for the corresponding operator, as 9207 // described in the rest of this subclause. 9208 unsigned NumParams = FnDecl->getNumParams() 9209 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9210 if (Op != OO_Call && 9211 ((NumParams == 1 && !CanBeUnaryOperator) || 9212 (NumParams == 2 && !CanBeBinaryOperator) || 9213 (NumParams < 1) || (NumParams > 2))) { 9214 // We have the wrong number of parameters. 9215 unsigned ErrorKind; 9216 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9217 ErrorKind = 2; // 2 -> unary or binary. 9218 } else if (CanBeUnaryOperator) { 9219 ErrorKind = 0; // 0 -> unary 9220 } else { 9221 assert(CanBeBinaryOperator && 9222 "All non-call overloaded operators are unary or binary!"); 9223 ErrorKind = 1; // 1 -> binary 9224 } 9225 9226 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9227 << FnDecl->getDeclName() << NumParams << ErrorKind; 9228 } 9229 9230 // Overloaded operators other than operator() cannot be variadic. 9231 if (Op != OO_Call && 9232 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9233 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9234 << FnDecl->getDeclName(); 9235 } 9236 9237 // Some operators must be non-static member functions. 9238 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9239 return Diag(FnDecl->getLocation(), 9240 diag::err_operator_overload_must_be_member) 9241 << FnDecl->getDeclName(); 9242 } 9243 9244 // C++ [over.inc]p1: 9245 // The user-defined function called operator++ implements the 9246 // prefix and postfix ++ operator. If this function is a member 9247 // function with no parameters, or a non-member function with one 9248 // parameter of class or enumeration type, it defines the prefix 9249 // increment operator ++ for objects of that type. If the function 9250 // is a member function with one parameter (which shall be of type 9251 // int) or a non-member function with two parameters (the second 9252 // of which shall be of type int), it defines the postfix 9253 // increment operator ++ for objects of that type. 9254 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9255 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9256 bool ParamIsInt = false; 9257 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9258 ParamIsInt = BT->getKind() == BuiltinType::Int; 9259 9260 if (!ParamIsInt) 9261 return Diag(LastParam->getLocation(), 9262 diag::err_operator_overload_post_incdec_must_be_int) 9263 << LastParam->getType() << (Op == OO_MinusMinus); 9264 } 9265 9266 return false; 9267} 9268 9269/// CheckLiteralOperatorDeclaration - Check whether the declaration 9270/// of this literal operator function is well-formed. If so, returns 9271/// false; otherwise, emits appropriate diagnostics and returns true. 9272bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9273 DeclContext *DC = FnDecl->getDeclContext(); 9274 Decl::Kind Kind = DC->getDeclKind(); 9275 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 9276 Kind != Decl::LinkageSpec) { 9277 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9278 << FnDecl->getDeclName(); 9279 return true; 9280 } 9281 9282 bool Valid = false; 9283 9284 // template <char...> type operator "" name() is the only valid template 9285 // signature, and the only valid signature with no parameters. 9286 if (FnDecl->param_size() == 0) { 9287 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 9288 // Must have only one template parameter 9289 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9290 if (Params->size() == 1) { 9291 NonTypeTemplateParmDecl *PmDecl = 9292 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9293 9294 // The template parameter must be a char parameter pack. 9295 if (PmDecl && PmDecl->isTemplateParameterPack() && 9296 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9297 Valid = true; 9298 } 9299 } 9300 } else { 9301 // Check the first parameter 9302 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9303 9304 QualType T = (*Param)->getType(); 9305 9306 // unsigned long long int, long double, and any character type are allowed 9307 // as the only parameters. 9308 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9309 Context.hasSameType(T, Context.LongDoubleTy) || 9310 Context.hasSameType(T, Context.CharTy) || 9311 Context.hasSameType(T, Context.WCharTy) || 9312 Context.hasSameType(T, Context.Char16Ty) || 9313 Context.hasSameType(T, Context.Char32Ty)) { 9314 if (++Param == FnDecl->param_end()) 9315 Valid = true; 9316 goto FinishedParams; 9317 } 9318 9319 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9320 const PointerType *PT = T->getAs<PointerType>(); 9321 if (!PT) 9322 goto FinishedParams; 9323 T = PT->getPointeeType(); 9324 if (!T.isConstQualified()) 9325 goto FinishedParams; 9326 T = T.getUnqualifiedType(); 9327 9328 // Move on to the second parameter; 9329 ++Param; 9330 9331 // If there is no second parameter, the first must be a const char * 9332 if (Param == FnDecl->param_end()) { 9333 if (Context.hasSameType(T, Context.CharTy)) 9334 Valid = true; 9335 goto FinishedParams; 9336 } 9337 9338 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9339 // are allowed as the first parameter to a two-parameter function 9340 if (!(Context.hasSameType(T, Context.CharTy) || 9341 Context.hasSameType(T, Context.WCharTy) || 9342 Context.hasSameType(T, Context.Char16Ty) || 9343 Context.hasSameType(T, Context.Char32Ty))) 9344 goto FinishedParams; 9345 9346 // The second and final parameter must be an std::size_t 9347 T = (*Param)->getType().getUnqualifiedType(); 9348 if (Context.hasSameType(T, Context.getSizeType()) && 9349 ++Param == FnDecl->param_end()) 9350 Valid = true; 9351 } 9352 9353 // FIXME: This diagnostic is absolutely terrible. 9354FinishedParams: 9355 if (!Valid) { 9356 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9357 << FnDecl->getDeclName(); 9358 return true; 9359 } 9360 9361 StringRef LiteralName 9362 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9363 if (LiteralName[0] != '_') { 9364 // C++0x [usrlit.suffix]p1: 9365 // Literal suffix identifiers that do not start with an underscore are 9366 // reserved for future standardization. 9367 bool IsHexFloat = true; 9368 if (LiteralName.size() > 1 && 9369 (LiteralName[0] == 'P' || LiteralName[0] == 'p')) { 9370 for (unsigned I = 1, N = LiteralName.size(); I < N; ++I) { 9371 if (!isdigit(LiteralName[I])) { 9372 IsHexFloat = false; 9373 break; 9374 } 9375 } 9376 } 9377 9378 if (IsHexFloat) 9379 Diag(FnDecl->getLocation(), diag::warn_user_literal_hexfloat) 9380 << LiteralName; 9381 else 9382 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9383 } 9384 9385 return false; 9386} 9387 9388/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9389/// linkage specification, including the language and (if present) 9390/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9391/// the location of the language string literal, which is provided 9392/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9393/// the '{' brace. Otherwise, this linkage specification does not 9394/// have any braces. 9395Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9396 SourceLocation LangLoc, 9397 StringRef Lang, 9398 SourceLocation LBraceLoc) { 9399 LinkageSpecDecl::LanguageIDs Language; 9400 if (Lang == "\"C\"") 9401 Language = LinkageSpecDecl::lang_c; 9402 else if (Lang == "\"C++\"") 9403 Language = LinkageSpecDecl::lang_cxx; 9404 else { 9405 Diag(LangLoc, diag::err_bad_language); 9406 return 0; 9407 } 9408 9409 // FIXME: Add all the various semantics of linkage specifications 9410 9411 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9412 ExternLoc, LangLoc, Language); 9413 CurContext->addDecl(D); 9414 PushDeclContext(S, D); 9415 return D; 9416} 9417 9418/// ActOnFinishLinkageSpecification - Complete the definition of 9419/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9420/// valid, it's the position of the closing '}' brace in a linkage 9421/// specification that uses braces. 9422Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9423 Decl *LinkageSpec, 9424 SourceLocation RBraceLoc) { 9425 if (LinkageSpec) { 9426 if (RBraceLoc.isValid()) { 9427 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9428 LSDecl->setRBraceLoc(RBraceLoc); 9429 } 9430 PopDeclContext(); 9431 } 9432 return LinkageSpec; 9433} 9434 9435/// \brief Perform semantic analysis for the variable declaration that 9436/// occurs within a C++ catch clause, returning the newly-created 9437/// variable. 9438VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9439 TypeSourceInfo *TInfo, 9440 SourceLocation StartLoc, 9441 SourceLocation Loc, 9442 IdentifierInfo *Name) { 9443 bool Invalid = false; 9444 QualType ExDeclType = TInfo->getType(); 9445 9446 // Arrays and functions decay. 9447 if (ExDeclType->isArrayType()) 9448 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9449 else if (ExDeclType->isFunctionType()) 9450 ExDeclType = Context.getPointerType(ExDeclType); 9451 9452 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9453 // The exception-declaration shall not denote a pointer or reference to an 9454 // incomplete type, other than [cv] void*. 9455 // N2844 forbids rvalue references. 9456 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9457 Diag(Loc, diag::err_catch_rvalue_ref); 9458 Invalid = true; 9459 } 9460 9461 // GCC allows catching pointers and references to incomplete types 9462 // as an extension; so do we, but we warn by default. 9463 9464 QualType BaseType = ExDeclType; 9465 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9466 unsigned DK = diag::err_catch_incomplete; 9467 bool IncompleteCatchIsInvalid = true; 9468 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9469 BaseType = Ptr->getPointeeType(); 9470 Mode = 1; 9471 DK = diag::ext_catch_incomplete_ptr; 9472 IncompleteCatchIsInvalid = false; 9473 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9474 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9475 BaseType = Ref->getPointeeType(); 9476 Mode = 2; 9477 DK = diag::ext_catch_incomplete_ref; 9478 IncompleteCatchIsInvalid = false; 9479 } 9480 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9481 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 9482 IncompleteCatchIsInvalid) 9483 Invalid = true; 9484 9485 if (!Invalid && !ExDeclType->isDependentType() && 9486 RequireNonAbstractType(Loc, ExDeclType, 9487 diag::err_abstract_type_in_decl, 9488 AbstractVariableType)) 9489 Invalid = true; 9490 9491 // Only the non-fragile NeXT runtime currently supports C++ catches 9492 // of ObjC types, and no runtime supports catching ObjC types by value. 9493 if (!Invalid && getLangOptions().ObjC1) { 9494 QualType T = ExDeclType; 9495 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9496 T = RT->getPointeeType(); 9497 9498 if (T->isObjCObjectType()) { 9499 Diag(Loc, diag::err_objc_object_catch); 9500 Invalid = true; 9501 } else if (T->isObjCObjectPointerType()) { 9502 if (!getLangOptions().ObjCNonFragileABI) 9503 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9504 } 9505 } 9506 9507 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9508 ExDeclType, TInfo, SC_None, SC_None); 9509 ExDecl->setExceptionVariable(true); 9510 9511 if (!Invalid && !ExDeclType->isDependentType()) { 9512 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9513 // C++ [except.handle]p16: 9514 // The object declared in an exception-declaration or, if the 9515 // exception-declaration does not specify a name, a temporary (12.2) is 9516 // copy-initialized (8.5) from the exception object. [...] 9517 // The object is destroyed when the handler exits, after the destruction 9518 // of any automatic objects initialized within the handler. 9519 // 9520 // We just pretend to initialize the object with itself, then make sure 9521 // it can be destroyed later. 9522 QualType initType = ExDeclType; 9523 9524 InitializedEntity entity = 9525 InitializedEntity::InitializeVariable(ExDecl); 9526 InitializationKind initKind = 9527 InitializationKind::CreateCopy(Loc, SourceLocation()); 9528 9529 Expr *opaqueValue = 9530 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9531 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9532 ExprResult result = sequence.Perform(*this, entity, initKind, 9533 MultiExprArg(&opaqueValue, 1)); 9534 if (result.isInvalid()) 9535 Invalid = true; 9536 else { 9537 // If the constructor used was non-trivial, set this as the 9538 // "initializer". 9539 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9540 if (!construct->getConstructor()->isTrivial()) { 9541 Expr *init = MaybeCreateExprWithCleanups(construct); 9542 ExDecl->setInit(init); 9543 } 9544 9545 // And make sure it's destructable. 9546 FinalizeVarWithDestructor(ExDecl, recordType); 9547 } 9548 } 9549 } 9550 9551 if (Invalid) 9552 ExDecl->setInvalidDecl(); 9553 9554 return ExDecl; 9555} 9556 9557/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9558/// handler. 9559Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9560 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9561 bool Invalid = D.isInvalidType(); 9562 9563 // Check for unexpanded parameter packs. 9564 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9565 UPPC_ExceptionType)) { 9566 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9567 D.getIdentifierLoc()); 9568 Invalid = true; 9569 } 9570 9571 IdentifierInfo *II = D.getIdentifier(); 9572 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9573 LookupOrdinaryName, 9574 ForRedeclaration)) { 9575 // The scope should be freshly made just for us. There is just no way 9576 // it contains any previous declaration. 9577 assert(!S->isDeclScope(PrevDecl)); 9578 if (PrevDecl->isTemplateParameter()) { 9579 // Maybe we will complain about the shadowed template parameter. 9580 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9581 } 9582 } 9583 9584 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9585 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9586 << D.getCXXScopeSpec().getRange(); 9587 Invalid = true; 9588 } 9589 9590 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9591 D.getSourceRange().getBegin(), 9592 D.getIdentifierLoc(), 9593 D.getIdentifier()); 9594 if (Invalid) 9595 ExDecl->setInvalidDecl(); 9596 9597 // Add the exception declaration into this scope. 9598 if (II) 9599 PushOnScopeChains(ExDecl, S); 9600 else 9601 CurContext->addDecl(ExDecl); 9602 9603 ProcessDeclAttributes(S, ExDecl, D); 9604 return ExDecl; 9605} 9606 9607Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9608 Expr *AssertExpr, 9609 Expr *AssertMessageExpr_, 9610 SourceLocation RParenLoc) { 9611 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9612 9613 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9614 llvm::APSInt Value(32); 9615 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 9616 Diag(StaticAssertLoc, 9617 diag::err_static_assert_expression_is_not_constant) << 9618 AssertExpr->getSourceRange(); 9619 return 0; 9620 } 9621 9622 if (Value == 0) { 9623 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9624 << AssertMessage->getString() << AssertExpr->getSourceRange(); 9625 } 9626 } 9627 9628 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9629 return 0; 9630 9631 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9632 AssertExpr, AssertMessage, RParenLoc); 9633 9634 CurContext->addDecl(Decl); 9635 return Decl; 9636} 9637 9638/// \brief Perform semantic analysis of the given friend type declaration. 9639/// 9640/// \returns A friend declaration that. 9641FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 9642 TypeSourceInfo *TSInfo) { 9643 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9644 9645 QualType T = TSInfo->getType(); 9646 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9647 9648 if (!getLangOptions().CPlusPlus0x) { 9649 // C++03 [class.friend]p2: 9650 // An elaborated-type-specifier shall be used in a friend declaration 9651 // for a class.* 9652 // 9653 // * The class-key of the elaborated-type-specifier is required. 9654 if (!ActiveTemplateInstantiations.empty()) { 9655 // Do not complain about the form of friend template types during 9656 // template instantiation; we will already have complained when the 9657 // template was declared. 9658 } else if (!T->isElaboratedTypeSpecifier()) { 9659 // If we evaluated the type to a record type, suggest putting 9660 // a tag in front. 9661 if (const RecordType *RT = T->getAs<RecordType>()) { 9662 RecordDecl *RD = RT->getDecl(); 9663 9664 std::string InsertionText = std::string(" ") + RD->getKindName(); 9665 9666 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 9667 << (unsigned) RD->getTagKind() 9668 << T 9669 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9670 InsertionText); 9671 } else { 9672 Diag(FriendLoc, diag::ext_nonclass_type_friend) 9673 << T 9674 << SourceRange(FriendLoc, TypeRange.getEnd()); 9675 } 9676 } else if (T->getAs<EnumType>()) { 9677 Diag(FriendLoc, diag::ext_enum_friend) 9678 << T 9679 << SourceRange(FriendLoc, TypeRange.getEnd()); 9680 } 9681 } 9682 9683 // C++0x [class.friend]p3: 9684 // If the type specifier in a friend declaration designates a (possibly 9685 // cv-qualified) class type, that class is declared as a friend; otherwise, 9686 // the friend declaration is ignored. 9687 9688 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9689 // in [class.friend]p3 that we do not implement. 9690 9691 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 9692} 9693 9694/// Handle a friend tag declaration where the scope specifier was 9695/// templated. 9696Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9697 unsigned TagSpec, SourceLocation TagLoc, 9698 CXXScopeSpec &SS, 9699 IdentifierInfo *Name, SourceLocation NameLoc, 9700 AttributeList *Attr, 9701 MultiTemplateParamsArg TempParamLists) { 9702 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9703 9704 bool isExplicitSpecialization = false; 9705 bool Invalid = false; 9706 9707 if (TemplateParameterList *TemplateParams 9708 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9709 TempParamLists.get(), 9710 TempParamLists.size(), 9711 /*friend*/ true, 9712 isExplicitSpecialization, 9713 Invalid)) { 9714 if (TemplateParams->size() > 0) { 9715 // This is a declaration of a class template. 9716 if (Invalid) 9717 return 0; 9718 9719 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9720 SS, Name, NameLoc, Attr, 9721 TemplateParams, AS_public, 9722 /*ModulePrivateLoc=*/SourceLocation(), 9723 TempParamLists.size() - 1, 9724 (TemplateParameterList**) TempParamLists.release()).take(); 9725 } else { 9726 // The "template<>" header is extraneous. 9727 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9728 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9729 isExplicitSpecialization = true; 9730 } 9731 } 9732 9733 if (Invalid) return 0; 9734 9735 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9736 9737 bool isAllExplicitSpecializations = true; 9738 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9739 if (TempParamLists.get()[I]->size()) { 9740 isAllExplicitSpecializations = false; 9741 break; 9742 } 9743 } 9744 9745 // FIXME: don't ignore attributes. 9746 9747 // If it's explicit specializations all the way down, just forget 9748 // about the template header and build an appropriate non-templated 9749 // friend. TODO: for source fidelity, remember the headers. 9750 if (isAllExplicitSpecializations) { 9751 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9752 ElaboratedTypeKeyword Keyword 9753 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9754 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9755 *Name, NameLoc); 9756 if (T.isNull()) 9757 return 0; 9758 9759 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9760 if (isa<DependentNameType>(T)) { 9761 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9762 TL.setKeywordLoc(TagLoc); 9763 TL.setQualifierLoc(QualifierLoc); 9764 TL.setNameLoc(NameLoc); 9765 } else { 9766 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9767 TL.setKeywordLoc(TagLoc); 9768 TL.setQualifierLoc(QualifierLoc); 9769 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 9770 } 9771 9772 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9773 TSI, FriendLoc); 9774 Friend->setAccess(AS_public); 9775 CurContext->addDecl(Friend); 9776 return Friend; 9777 } 9778 9779 // Handle the case of a templated-scope friend class. e.g. 9780 // template <class T> class A<T>::B; 9781 // FIXME: we don't support these right now. 9782 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9783 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 9784 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9785 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9786 TL.setKeywordLoc(TagLoc); 9787 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 9788 TL.setNameLoc(NameLoc); 9789 9790 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9791 TSI, FriendLoc); 9792 Friend->setAccess(AS_public); 9793 Friend->setUnsupportedFriend(true); 9794 CurContext->addDecl(Friend); 9795 return Friend; 9796} 9797 9798 9799/// Handle a friend type declaration. This works in tandem with 9800/// ActOnTag. 9801/// 9802/// Notes on friend class templates: 9803/// 9804/// We generally treat friend class declarations as if they were 9805/// declaring a class. So, for example, the elaborated type specifier 9806/// in a friend declaration is required to obey the restrictions of a 9807/// class-head (i.e. no typedefs in the scope chain), template 9808/// parameters are required to match up with simple template-ids, &c. 9809/// However, unlike when declaring a template specialization, it's 9810/// okay to refer to a template specialization without an empty 9811/// template parameter declaration, e.g. 9812/// friend class A<T>::B<unsigned>; 9813/// We permit this as a special case; if there are any template 9814/// parameters present at all, require proper matching, i.e. 9815/// template <> template <class T> friend class A<int>::B; 9816Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 9817 MultiTemplateParamsArg TempParams) { 9818 SourceLocation Loc = DS.getSourceRange().getBegin(); 9819 9820 assert(DS.isFriendSpecified()); 9821 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9822 9823 // Try to convert the decl specifier to a type. This works for 9824 // friend templates because ActOnTag never produces a ClassTemplateDecl 9825 // for a TUK_Friend. 9826 Declarator TheDeclarator(DS, Declarator::MemberContext); 9827 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 9828 QualType T = TSI->getType(); 9829 if (TheDeclarator.isInvalidType()) 9830 return 0; 9831 9832 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 9833 return 0; 9834 9835 // This is definitely an error in C++98. It's probably meant to 9836 // be forbidden in C++0x, too, but the specification is just 9837 // poorly written. 9838 // 9839 // The problem is with declarations like the following: 9840 // template <T> friend A<T>::foo; 9841 // where deciding whether a class C is a friend or not now hinges 9842 // on whether there exists an instantiation of A that causes 9843 // 'foo' to equal C. There are restrictions on class-heads 9844 // (which we declare (by fiat) elaborated friend declarations to 9845 // be) that makes this tractable. 9846 // 9847 // FIXME: handle "template <> friend class A<T>;", which 9848 // is possibly well-formed? Who even knows? 9849 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 9850 Diag(Loc, diag::err_tagless_friend_type_template) 9851 << DS.getSourceRange(); 9852 return 0; 9853 } 9854 9855 // C++98 [class.friend]p1: A friend of a class is a function 9856 // or class that is not a member of the class . . . 9857 // This is fixed in DR77, which just barely didn't make the C++03 9858 // deadline. It's also a very silly restriction that seriously 9859 // affects inner classes and which nobody else seems to implement; 9860 // thus we never diagnose it, not even in -pedantic. 9861 // 9862 // But note that we could warn about it: it's always useless to 9863 // friend one of your own members (it's not, however, worthless to 9864 // friend a member of an arbitrary specialization of your template). 9865 9866 Decl *D; 9867 if (unsigned NumTempParamLists = TempParams.size()) 9868 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 9869 NumTempParamLists, 9870 TempParams.release(), 9871 TSI, 9872 DS.getFriendSpecLoc()); 9873 else 9874 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 9875 9876 if (!D) 9877 return 0; 9878 9879 D->setAccess(AS_public); 9880 CurContext->addDecl(D); 9881 9882 return D; 9883} 9884 9885Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 9886 MultiTemplateParamsArg TemplateParams) { 9887 const DeclSpec &DS = D.getDeclSpec(); 9888 9889 assert(DS.isFriendSpecified()); 9890 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9891 9892 SourceLocation Loc = D.getIdentifierLoc(); 9893 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9894 9895 // C++ [class.friend]p1 9896 // A friend of a class is a function or class.... 9897 // Note that this sees through typedefs, which is intended. 9898 // It *doesn't* see through dependent types, which is correct 9899 // according to [temp.arg.type]p3: 9900 // If a declaration acquires a function type through a 9901 // type dependent on a template-parameter and this causes 9902 // a declaration that does not use the syntactic form of a 9903 // function declarator to have a function type, the program 9904 // is ill-formed. 9905 if (!TInfo->getType()->isFunctionType()) { 9906 Diag(Loc, diag::err_unexpected_friend); 9907 9908 // It might be worthwhile to try to recover by creating an 9909 // appropriate declaration. 9910 return 0; 9911 } 9912 9913 // C++ [namespace.memdef]p3 9914 // - If a friend declaration in a non-local class first declares a 9915 // class or function, the friend class or function is a member 9916 // of the innermost enclosing namespace. 9917 // - The name of the friend is not found by simple name lookup 9918 // until a matching declaration is provided in that namespace 9919 // scope (either before or after the class declaration granting 9920 // friendship). 9921 // - If a friend function is called, its name may be found by the 9922 // name lookup that considers functions from namespaces and 9923 // classes associated with the types of the function arguments. 9924 // - When looking for a prior declaration of a class or a function 9925 // declared as a friend, scopes outside the innermost enclosing 9926 // namespace scope are not considered. 9927 9928 CXXScopeSpec &SS = D.getCXXScopeSpec(); 9929 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 9930 DeclarationName Name = NameInfo.getName(); 9931 assert(Name); 9932 9933 // Check for unexpanded parameter packs. 9934 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 9935 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 9936 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 9937 return 0; 9938 9939 // The context we found the declaration in, or in which we should 9940 // create the declaration. 9941 DeclContext *DC; 9942 Scope *DCScope = S; 9943 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 9944 ForRedeclaration); 9945 9946 // FIXME: there are different rules in local classes 9947 9948 // There are four cases here. 9949 // - There's no scope specifier, in which case we just go to the 9950 // appropriate scope and look for a function or function template 9951 // there as appropriate. 9952 // Recover from invalid scope qualifiers as if they just weren't there. 9953 if (SS.isInvalid() || !SS.isSet()) { 9954 // C++0x [namespace.memdef]p3: 9955 // If the name in a friend declaration is neither qualified nor 9956 // a template-id and the declaration is a function or an 9957 // elaborated-type-specifier, the lookup to determine whether 9958 // the entity has been previously declared shall not consider 9959 // any scopes outside the innermost enclosing namespace. 9960 // C++0x [class.friend]p11: 9961 // If a friend declaration appears in a local class and the name 9962 // specified is an unqualified name, a prior declaration is 9963 // looked up without considering scopes that are outside the 9964 // innermost enclosing non-class scope. For a friend function 9965 // declaration, if there is no prior declaration, the program is 9966 // ill-formed. 9967 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 9968 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 9969 9970 // Find the appropriate context according to the above. 9971 DC = CurContext; 9972 while (true) { 9973 // Skip class contexts. If someone can cite chapter and verse 9974 // for this behavior, that would be nice --- it's what GCC and 9975 // EDG do, and it seems like a reasonable intent, but the spec 9976 // really only says that checks for unqualified existing 9977 // declarations should stop at the nearest enclosing namespace, 9978 // not that they should only consider the nearest enclosing 9979 // namespace. 9980 while (DC->isRecord()) 9981 DC = DC->getParent(); 9982 9983 LookupQualifiedName(Previous, DC); 9984 9985 // TODO: decide what we think about using declarations. 9986 if (isLocal || !Previous.empty()) 9987 break; 9988 9989 if (isTemplateId) { 9990 if (isa<TranslationUnitDecl>(DC)) break; 9991 } else { 9992 if (DC->isFileContext()) break; 9993 } 9994 DC = DC->getParent(); 9995 } 9996 9997 // C++ [class.friend]p1: A friend of a class is a function or 9998 // class that is not a member of the class . . . 9999 // C++0x changes this for both friend types and functions. 10000 // Most C++ 98 compilers do seem to give an error here, so 10001 // we do, too. 10002 if (!Previous.empty() && DC->Equals(CurContext) 10003 && !getLangOptions().CPlusPlus0x) 10004 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 10005 10006 DCScope = getScopeForDeclContext(S, DC); 10007 10008 // C++ [class.friend]p6: 10009 // A function can be defined in a friend declaration of a class if and 10010 // only if the class is a non-local class (9.8), the function name is 10011 // unqualified, and the function has namespace scope. 10012 if (isLocal && D.isFunctionDefinition()) { 10013 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10014 } 10015 10016 // - There's a non-dependent scope specifier, in which case we 10017 // compute it and do a previous lookup there for a function 10018 // or function template. 10019 } else if (!SS.getScopeRep()->isDependent()) { 10020 DC = computeDeclContext(SS); 10021 if (!DC) return 0; 10022 10023 if (RequireCompleteDeclContext(SS, DC)) return 0; 10024 10025 LookupQualifiedName(Previous, DC); 10026 10027 // Ignore things found implicitly in the wrong scope. 10028 // TODO: better diagnostics for this case. Suggesting the right 10029 // qualified scope would be nice... 10030 LookupResult::Filter F = Previous.makeFilter(); 10031 while (F.hasNext()) { 10032 NamedDecl *D = F.next(); 10033 if (!DC->InEnclosingNamespaceSetOf( 10034 D->getDeclContext()->getRedeclContext())) 10035 F.erase(); 10036 } 10037 F.done(); 10038 10039 if (Previous.empty()) { 10040 D.setInvalidType(); 10041 Diag(Loc, diag::err_qualified_friend_not_found) 10042 << Name << TInfo->getType(); 10043 return 0; 10044 } 10045 10046 // C++ [class.friend]p1: A friend of a class is a function or 10047 // class that is not a member of the class . . . 10048 if (DC->Equals(CurContext) && !getLangOptions().CPlusPlus0x) 10049 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 10050 10051 if (D.isFunctionDefinition()) { 10052 // C++ [class.friend]p6: 10053 // A function can be defined in a friend declaration of a class if and 10054 // only if the class is a non-local class (9.8), the function name is 10055 // unqualified, and the function has namespace scope. 10056 SemaDiagnosticBuilder DB 10057 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10058 10059 DB << SS.getScopeRep(); 10060 if (DC->isFileContext()) 10061 DB << FixItHint::CreateRemoval(SS.getRange()); 10062 SS.clear(); 10063 } 10064 10065 // - There's a scope specifier that does not match any template 10066 // parameter lists, in which case we use some arbitrary context, 10067 // create a method or method template, and wait for instantiation. 10068 // - There's a scope specifier that does match some template 10069 // parameter lists, which we don't handle right now. 10070 } else { 10071 if (D.isFunctionDefinition()) { 10072 // C++ [class.friend]p6: 10073 // A function can be defined in a friend declaration of a class if and 10074 // only if the class is a non-local class (9.8), the function name is 10075 // unqualified, and the function has namespace scope. 10076 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10077 << SS.getScopeRep(); 10078 } 10079 10080 DC = CurContext; 10081 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10082 } 10083 10084 if (!DC->isRecord()) { 10085 // This implies that it has to be an operator or function. 10086 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10087 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10088 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10089 Diag(Loc, diag::err_introducing_special_friend) << 10090 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10091 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10092 return 0; 10093 } 10094 } 10095 10096 bool AddToScope = true; 10097 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10098 move(TemplateParams), AddToScope); 10099 if (!ND) return 0; 10100 10101 assert(ND->getDeclContext() == DC); 10102 assert(ND->getLexicalDeclContext() == CurContext); 10103 10104 // Add the function declaration to the appropriate lookup tables, 10105 // adjusting the redeclarations list as necessary. We don't 10106 // want to do this yet if the friending class is dependent. 10107 // 10108 // Also update the scope-based lookup if the target context's 10109 // lookup context is in lexical scope. 10110 if (!CurContext->isDependentContext()) { 10111 DC = DC->getRedeclContext(); 10112 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 10113 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10114 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10115 } 10116 10117 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10118 D.getIdentifierLoc(), ND, 10119 DS.getFriendSpecLoc()); 10120 FrD->setAccess(AS_public); 10121 CurContext->addDecl(FrD); 10122 10123 if (ND->isInvalidDecl()) 10124 FrD->setInvalidDecl(); 10125 else { 10126 FunctionDecl *FD; 10127 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10128 FD = FTD->getTemplatedDecl(); 10129 else 10130 FD = cast<FunctionDecl>(ND); 10131 10132 // Mark templated-scope function declarations as unsupported. 10133 if (FD->getNumTemplateParameterLists()) 10134 FrD->setUnsupportedFriend(true); 10135 } 10136 10137 return ND; 10138} 10139 10140void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10141 AdjustDeclIfTemplate(Dcl); 10142 10143 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10144 if (!Fn) { 10145 Diag(DelLoc, diag::err_deleted_non_function); 10146 return; 10147 } 10148 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 10149 Diag(DelLoc, diag::err_deleted_decl_not_first); 10150 Diag(Prev->getLocation(), diag::note_previous_declaration); 10151 // If the declaration wasn't the first, we delete the function anyway for 10152 // recovery. 10153 } 10154 Fn->setDeletedAsWritten(); 10155} 10156 10157void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10158 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10159 10160 if (MD) { 10161 if (MD->getParent()->isDependentType()) { 10162 MD->setDefaulted(); 10163 MD->setExplicitlyDefaulted(); 10164 return; 10165 } 10166 10167 CXXSpecialMember Member = getSpecialMember(MD); 10168 if (Member == CXXInvalid) { 10169 Diag(DefaultLoc, diag::err_default_special_members); 10170 return; 10171 } 10172 10173 MD->setDefaulted(); 10174 MD->setExplicitlyDefaulted(); 10175 10176 // If this definition appears within the record, do the checking when 10177 // the record is complete. 10178 const FunctionDecl *Primary = MD; 10179 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10180 // Find the uninstantiated declaration that actually had the '= default' 10181 // on it. 10182 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10183 10184 if (Primary == Primary->getCanonicalDecl()) 10185 return; 10186 10187 switch (Member) { 10188 case CXXDefaultConstructor: { 10189 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10190 CheckExplicitlyDefaultedDefaultConstructor(CD); 10191 if (!CD->isInvalidDecl()) 10192 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10193 break; 10194 } 10195 10196 case CXXCopyConstructor: { 10197 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10198 CheckExplicitlyDefaultedCopyConstructor(CD); 10199 if (!CD->isInvalidDecl()) 10200 DefineImplicitCopyConstructor(DefaultLoc, CD); 10201 break; 10202 } 10203 10204 case CXXCopyAssignment: { 10205 CheckExplicitlyDefaultedCopyAssignment(MD); 10206 if (!MD->isInvalidDecl()) 10207 DefineImplicitCopyAssignment(DefaultLoc, MD); 10208 break; 10209 } 10210 10211 case CXXDestructor: { 10212 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10213 CheckExplicitlyDefaultedDestructor(DD); 10214 if (!DD->isInvalidDecl()) 10215 DefineImplicitDestructor(DefaultLoc, DD); 10216 break; 10217 } 10218 10219 case CXXMoveConstructor: { 10220 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10221 CheckExplicitlyDefaultedMoveConstructor(CD); 10222 if (!CD->isInvalidDecl()) 10223 DefineImplicitMoveConstructor(DefaultLoc, CD); 10224 break; 10225 } 10226 10227 case CXXMoveAssignment: { 10228 CheckExplicitlyDefaultedMoveAssignment(MD); 10229 if (!MD->isInvalidDecl()) 10230 DefineImplicitMoveAssignment(DefaultLoc, MD); 10231 break; 10232 } 10233 10234 case CXXInvalid: 10235 llvm_unreachable("Invalid special member."); 10236 } 10237 } else { 10238 Diag(DefaultLoc, diag::err_default_special_members); 10239 } 10240} 10241 10242static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10243 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10244 Stmt *SubStmt = *CI; 10245 if (!SubStmt) 10246 continue; 10247 if (isa<ReturnStmt>(SubStmt)) 10248 Self.Diag(SubStmt->getSourceRange().getBegin(), 10249 diag::err_return_in_constructor_handler); 10250 if (!isa<Expr>(SubStmt)) 10251 SearchForReturnInStmt(Self, SubStmt); 10252 } 10253} 10254 10255void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10256 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10257 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10258 SearchForReturnInStmt(*this, Handler); 10259 } 10260} 10261 10262bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10263 const CXXMethodDecl *Old) { 10264 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10265 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10266 10267 if (Context.hasSameType(NewTy, OldTy) || 10268 NewTy->isDependentType() || OldTy->isDependentType()) 10269 return false; 10270 10271 // Check if the return types are covariant 10272 QualType NewClassTy, OldClassTy; 10273 10274 /// Both types must be pointers or references to classes. 10275 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10276 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10277 NewClassTy = NewPT->getPointeeType(); 10278 OldClassTy = OldPT->getPointeeType(); 10279 } 10280 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10281 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10282 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10283 NewClassTy = NewRT->getPointeeType(); 10284 OldClassTy = OldRT->getPointeeType(); 10285 } 10286 } 10287 } 10288 10289 // The return types aren't either both pointers or references to a class type. 10290 if (NewClassTy.isNull()) { 10291 Diag(New->getLocation(), 10292 diag::err_different_return_type_for_overriding_virtual_function) 10293 << New->getDeclName() << NewTy << OldTy; 10294 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10295 10296 return true; 10297 } 10298 10299 // C++ [class.virtual]p6: 10300 // If the return type of D::f differs from the return type of B::f, the 10301 // class type in the return type of D::f shall be complete at the point of 10302 // declaration of D::f or shall be the class type D. 10303 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10304 if (!RT->isBeingDefined() && 10305 RequireCompleteType(New->getLocation(), NewClassTy, 10306 PDiag(diag::err_covariant_return_incomplete) 10307 << New->getDeclName())) 10308 return true; 10309 } 10310 10311 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10312 // Check if the new class derives from the old class. 10313 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10314 Diag(New->getLocation(), 10315 diag::err_covariant_return_not_derived) 10316 << New->getDeclName() << NewTy << OldTy; 10317 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10318 return true; 10319 } 10320 10321 // Check if we the conversion from derived to base is valid. 10322 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10323 diag::err_covariant_return_inaccessible_base, 10324 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10325 // FIXME: Should this point to the return type? 10326 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10327 // FIXME: this note won't trigger for delayed access control 10328 // diagnostics, and it's impossible to get an undelayed error 10329 // here from access control during the original parse because 10330 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10331 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10332 return true; 10333 } 10334 } 10335 10336 // The qualifiers of the return types must be the same. 10337 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10338 Diag(New->getLocation(), 10339 diag::err_covariant_return_type_different_qualifications) 10340 << New->getDeclName() << NewTy << OldTy; 10341 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10342 return true; 10343 }; 10344 10345 10346 // The new class type must have the same or less qualifiers as the old type. 10347 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10348 Diag(New->getLocation(), 10349 diag::err_covariant_return_type_class_type_more_qualified) 10350 << New->getDeclName() << NewTy << OldTy; 10351 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10352 return true; 10353 }; 10354 10355 return false; 10356} 10357 10358/// \brief Mark the given method pure. 10359/// 10360/// \param Method the method to be marked pure. 10361/// 10362/// \param InitRange the source range that covers the "0" initializer. 10363bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10364 SourceLocation EndLoc = InitRange.getEnd(); 10365 if (EndLoc.isValid()) 10366 Method->setRangeEnd(EndLoc); 10367 10368 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10369 Method->setPure(); 10370 return false; 10371 } 10372 10373 if (!Method->isInvalidDecl()) 10374 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10375 << Method->getDeclName() << InitRange; 10376 return true; 10377} 10378 10379/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10380/// an initializer for the out-of-line declaration 'Dcl'. The scope 10381/// is a fresh scope pushed for just this purpose. 10382/// 10383/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10384/// static data member of class X, names should be looked up in the scope of 10385/// class X. 10386void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10387 // If there is no declaration, there was an error parsing it. 10388 if (D == 0 || D->isInvalidDecl()) return; 10389 10390 // We should only get called for declarations with scope specifiers, like: 10391 // int foo::bar; 10392 assert(D->isOutOfLine()); 10393 EnterDeclaratorContext(S, D->getDeclContext()); 10394} 10395 10396/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10397/// initializer for the out-of-line declaration 'D'. 10398void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10399 // If there is no declaration, there was an error parsing it. 10400 if (D == 0 || D->isInvalidDecl()) return; 10401 10402 assert(D->isOutOfLine()); 10403 ExitDeclaratorContext(S); 10404} 10405 10406/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10407/// C++ if/switch/while/for statement. 10408/// e.g: "if (int x = f()) {...}" 10409DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10410 // C++ 6.4p2: 10411 // The declarator shall not specify a function or an array. 10412 // The type-specifier-seq shall not contain typedef and shall not declare a 10413 // new class or enumeration. 10414 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10415 "Parser allowed 'typedef' as storage class of condition decl."); 10416 10417 Decl *Dcl = ActOnDeclarator(S, D); 10418 if (!Dcl) 10419 return true; 10420 10421 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10422 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10423 << D.getSourceRange(); 10424 return true; 10425 } 10426 10427 return Dcl; 10428} 10429 10430void Sema::LoadExternalVTableUses() { 10431 if (!ExternalSource) 10432 return; 10433 10434 SmallVector<ExternalVTableUse, 4> VTables; 10435 ExternalSource->ReadUsedVTables(VTables); 10436 SmallVector<VTableUse, 4> NewUses; 10437 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10438 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10439 = VTablesUsed.find(VTables[I].Record); 10440 // Even if a definition wasn't required before, it may be required now. 10441 if (Pos != VTablesUsed.end()) { 10442 if (!Pos->second && VTables[I].DefinitionRequired) 10443 Pos->second = true; 10444 continue; 10445 } 10446 10447 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10448 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10449 } 10450 10451 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10452} 10453 10454void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10455 bool DefinitionRequired) { 10456 // Ignore any vtable uses in unevaluated operands or for classes that do 10457 // not have a vtable. 10458 if (!Class->isDynamicClass() || Class->isDependentContext() || 10459 CurContext->isDependentContext() || 10460 ExprEvalContexts.back().Context == Unevaluated) 10461 return; 10462 10463 // Try to insert this class into the map. 10464 LoadExternalVTableUses(); 10465 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10466 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10467 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10468 if (!Pos.second) { 10469 // If we already had an entry, check to see if we are promoting this vtable 10470 // to required a definition. If so, we need to reappend to the VTableUses 10471 // list, since we may have already processed the first entry. 10472 if (DefinitionRequired && !Pos.first->second) { 10473 Pos.first->second = true; 10474 } else { 10475 // Otherwise, we can early exit. 10476 return; 10477 } 10478 } 10479 10480 // Local classes need to have their virtual members marked 10481 // immediately. For all other classes, we mark their virtual members 10482 // at the end of the translation unit. 10483 if (Class->isLocalClass()) 10484 MarkVirtualMembersReferenced(Loc, Class); 10485 else 10486 VTableUses.push_back(std::make_pair(Class, Loc)); 10487} 10488 10489bool Sema::DefineUsedVTables() { 10490 LoadExternalVTableUses(); 10491 if (VTableUses.empty()) 10492 return false; 10493 10494 // Note: The VTableUses vector could grow as a result of marking 10495 // the members of a class as "used", so we check the size each 10496 // time through the loop and prefer indices (with are stable) to 10497 // iterators (which are not). 10498 bool DefinedAnything = false; 10499 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10500 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10501 if (!Class) 10502 continue; 10503 10504 SourceLocation Loc = VTableUses[I].second; 10505 10506 // If this class has a key function, but that key function is 10507 // defined in another translation unit, we don't need to emit the 10508 // vtable even though we're using it. 10509 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10510 if (KeyFunction && !KeyFunction->hasBody()) { 10511 switch (KeyFunction->getTemplateSpecializationKind()) { 10512 case TSK_Undeclared: 10513 case TSK_ExplicitSpecialization: 10514 case TSK_ExplicitInstantiationDeclaration: 10515 // The key function is in another translation unit. 10516 continue; 10517 10518 case TSK_ExplicitInstantiationDefinition: 10519 case TSK_ImplicitInstantiation: 10520 // We will be instantiating the key function. 10521 break; 10522 } 10523 } else if (!KeyFunction) { 10524 // If we have a class with no key function that is the subject 10525 // of an explicit instantiation declaration, suppress the 10526 // vtable; it will live with the explicit instantiation 10527 // definition. 10528 bool IsExplicitInstantiationDeclaration 10529 = Class->getTemplateSpecializationKind() 10530 == TSK_ExplicitInstantiationDeclaration; 10531 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10532 REnd = Class->redecls_end(); 10533 R != REnd; ++R) { 10534 TemplateSpecializationKind TSK 10535 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10536 if (TSK == TSK_ExplicitInstantiationDeclaration) 10537 IsExplicitInstantiationDeclaration = true; 10538 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10539 IsExplicitInstantiationDeclaration = false; 10540 break; 10541 } 10542 } 10543 10544 if (IsExplicitInstantiationDeclaration) 10545 continue; 10546 } 10547 10548 // Mark all of the virtual members of this class as referenced, so 10549 // that we can build a vtable. Then, tell the AST consumer that a 10550 // vtable for this class is required. 10551 DefinedAnything = true; 10552 MarkVirtualMembersReferenced(Loc, Class); 10553 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10554 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10555 10556 // Optionally warn if we're emitting a weak vtable. 10557 if (Class->getLinkage() == ExternalLinkage && 10558 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10559 const FunctionDecl *KeyFunctionDef = 0; 10560 if (!KeyFunction || 10561 (KeyFunction->hasBody(KeyFunctionDef) && 10562 KeyFunctionDef->isInlined())) 10563 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 10564 } 10565 } 10566 VTableUses.clear(); 10567 10568 return DefinedAnything; 10569} 10570 10571void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10572 const CXXRecordDecl *RD) { 10573 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10574 e = RD->method_end(); i != e; ++i) { 10575 CXXMethodDecl *MD = *i; 10576 10577 // C++ [basic.def.odr]p2: 10578 // [...] A virtual member function is used if it is not pure. [...] 10579 if (MD->isVirtual() && !MD->isPure()) 10580 MarkDeclarationReferenced(Loc, MD); 10581 } 10582 10583 // Only classes that have virtual bases need a VTT. 10584 if (RD->getNumVBases() == 0) 10585 return; 10586 10587 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10588 e = RD->bases_end(); i != e; ++i) { 10589 const CXXRecordDecl *Base = 10590 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10591 if (Base->getNumVBases() == 0) 10592 continue; 10593 MarkVirtualMembersReferenced(Loc, Base); 10594 } 10595} 10596 10597/// SetIvarInitializers - This routine builds initialization ASTs for the 10598/// Objective-C implementation whose ivars need be initialized. 10599void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10600 if (!getLangOptions().CPlusPlus) 10601 return; 10602 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10603 SmallVector<ObjCIvarDecl*, 8> ivars; 10604 CollectIvarsToConstructOrDestruct(OID, ivars); 10605 if (ivars.empty()) 10606 return; 10607 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10608 for (unsigned i = 0; i < ivars.size(); i++) { 10609 FieldDecl *Field = ivars[i]; 10610 if (Field->isInvalidDecl()) 10611 continue; 10612 10613 CXXCtorInitializer *Member; 10614 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10615 InitializationKind InitKind = 10616 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10617 10618 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10619 ExprResult MemberInit = 10620 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10621 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10622 // Note, MemberInit could actually come back empty if no initialization 10623 // is required (e.g., because it would call a trivial default constructor) 10624 if (!MemberInit.get() || MemberInit.isInvalid()) 10625 continue; 10626 10627 Member = 10628 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10629 SourceLocation(), 10630 MemberInit.takeAs<Expr>(), 10631 SourceLocation()); 10632 AllToInit.push_back(Member); 10633 10634 // Be sure that the destructor is accessible and is marked as referenced. 10635 if (const RecordType *RecordTy 10636 = Context.getBaseElementType(Field->getType()) 10637 ->getAs<RecordType>()) { 10638 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10639 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10640 MarkDeclarationReferenced(Field->getLocation(), Destructor); 10641 CheckDestructorAccess(Field->getLocation(), Destructor, 10642 PDiag(diag::err_access_dtor_ivar) 10643 << Context.getBaseElementType(Field->getType())); 10644 } 10645 } 10646 } 10647 ObjCImplementation->setIvarInitializers(Context, 10648 AllToInit.data(), AllToInit.size()); 10649 } 10650} 10651 10652static 10653void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10654 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10655 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10656 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10657 Sema &S) { 10658 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10659 CE = Current.end(); 10660 if (Ctor->isInvalidDecl()) 10661 return; 10662 10663 const FunctionDecl *FNTarget = 0; 10664 CXXConstructorDecl *Target; 10665 10666 // We ignore the result here since if we don't have a body, Target will be 10667 // null below. 10668 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10669 Target 10670= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10671 10672 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10673 // Avoid dereferencing a null pointer here. 10674 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10675 10676 if (!Current.insert(Canonical)) 10677 return; 10678 10679 // We know that beyond here, we aren't chaining into a cycle. 10680 if (!Target || !Target->isDelegatingConstructor() || 10681 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10682 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10683 Valid.insert(*CI); 10684 Current.clear(); 10685 // We've hit a cycle. 10686 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 10687 Current.count(TCanonical)) { 10688 // If we haven't diagnosed this cycle yet, do so now. 10689 if (!Invalid.count(TCanonical)) { 10690 S.Diag((*Ctor->init_begin())->getSourceLocation(), 10691 diag::warn_delegating_ctor_cycle) 10692 << Ctor; 10693 10694 // Don't add a note for a function delegating directo to itself. 10695 if (TCanonical != Canonical) 10696 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 10697 10698 CXXConstructorDecl *C = Target; 10699 while (C->getCanonicalDecl() != Canonical) { 10700 (void)C->getTargetConstructor()->hasBody(FNTarget); 10701 assert(FNTarget && "Ctor cycle through bodiless function"); 10702 10703 C 10704 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 10705 S.Diag(C->getLocation(), diag::note_which_delegates_to); 10706 } 10707 } 10708 10709 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10710 Invalid.insert(*CI); 10711 Current.clear(); 10712 } else { 10713 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 10714 } 10715} 10716 10717 10718void Sema::CheckDelegatingCtorCycles() { 10719 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 10720 10721 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10722 CE = Current.end(); 10723 10724 for (DelegatingCtorDeclsType::iterator 10725 I = DelegatingCtorDecls.begin(ExternalSource), 10726 E = DelegatingCtorDecls.end(); 10727 I != E; ++I) { 10728 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 10729 } 10730 10731 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 10732 (*CI)->setInvalidDecl(); 10733} 10734 10735/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 10736Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 10737 // Implicitly declared functions (e.g. copy constructors) are 10738 // __host__ __device__ 10739 if (D->isImplicit()) 10740 return CFT_HostDevice; 10741 10742 if (D->hasAttr<CUDAGlobalAttr>()) 10743 return CFT_Global; 10744 10745 if (D->hasAttr<CUDADeviceAttr>()) { 10746 if (D->hasAttr<CUDAHostAttr>()) 10747 return CFT_HostDevice; 10748 else 10749 return CFT_Device; 10750 } 10751 10752 return CFT_Host; 10753} 10754 10755bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 10756 CUDAFunctionTarget CalleeTarget) { 10757 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 10758 // Callable from the device only." 10759 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 10760 return true; 10761 10762 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 10763 // Callable from the host only." 10764 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 10765 // Callable from the host only." 10766 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 10767 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 10768 return true; 10769 10770 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 10771 return true; 10772 10773 return false; 10774} 10775