SemaDeclCXX.cpp revision a6b8b2c09610b8bc4330e948ece8b940c2386406
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. 1379Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1380 SourceLocation ASLoc, 1381 SourceLocation ColonLoc) { 1382 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1383 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1384 ASLoc, ColonLoc); 1385 CurContext->addHiddenDecl(ASDecl); 1386 return ASDecl; 1387} 1388 1389/// CheckOverrideControl - Check C++0x override control semantics. 1390void Sema::CheckOverrideControl(const Decl *D) { 1391 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1392 if (!MD || !MD->isVirtual()) 1393 return; 1394 1395 if (MD->isDependentContext()) 1396 return; 1397 1398 // C++0x [class.virtual]p3: 1399 // If a virtual function is marked with the virt-specifier override and does 1400 // not override a member function of a base class, 1401 // the program is ill-formed. 1402 bool HasOverriddenMethods = 1403 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1404 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1405 Diag(MD->getLocation(), 1406 diag::err_function_marked_override_not_overriding) 1407 << MD->getDeclName(); 1408 return; 1409 } 1410} 1411 1412/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1413/// function overrides a virtual member function marked 'final', according to 1414/// C++0x [class.virtual]p3. 1415bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1416 const CXXMethodDecl *Old) { 1417 if (!Old->hasAttr<FinalAttr>()) 1418 return false; 1419 1420 Diag(New->getLocation(), diag::err_final_function_overridden) 1421 << New->getDeclName(); 1422 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1423 return true; 1424} 1425 1426/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1427/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1428/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1429/// one has been parsed, and 'HasDeferredInit' is true if an initializer is 1430/// present but parsing it has been deferred. 1431Decl * 1432Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1433 MultiTemplateParamsArg TemplateParameterLists, 1434 Expr *BW, const VirtSpecifiers &VS, 1435 bool HasDeferredInit, 1436 bool IsDefinition) { 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), IsDefinition); 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 (ShouldDeleteCopyConstructor(CD)) { 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 (ShouldDeleteMoveConstructor(CD)) { 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 4105bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM) { 4106 assert(!MD->isInvalidDecl()); 4107 CXXRecordDecl *RD = MD->getParent(); 4108 assert(!RD->isDependentType() && "do deletion after instantiation"); 4109 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4110 return false; 4111 4112 bool IsUnion = RD->isUnion(); 4113 bool IsConstructor = false; 4114 bool IsAssignment = false; 4115 bool IsMove = false; 4116 4117 bool ConstArg = false; 4118 4119 switch (CSM) { 4120 case CXXDefaultConstructor: 4121 IsConstructor = true; 4122 break; 4123 default: 4124 llvm_unreachable("function only currently implemented for default ctors"); 4125 } 4126 4127 SourceLocation Loc = MD->getLocation(); 4128 4129 // Do access control from the constructor 4130 ContextRAII MethodContext(*this, MD); 4131 4132 bool AllConst = true; 4133 4134 // We do this because we should never actually use an anonymous 4135 // union's constructor. 4136 if (IsUnion && RD->isAnonymousStructOrUnion()) 4137 return false; 4138 4139 // FIXME: We should put some diagnostic logic right into this function. 4140 4141 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4142 BE = RD->bases_end(); 4143 BI != BE; ++BI) { 4144 // We'll handle this one later 4145 if (BI->isVirtual()) 4146 continue; 4147 4148 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4149 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4150 4151 // Unless we have an assignment operator, the base's destructor must 4152 // be accessible and not deleted. 4153 if (!IsAssignment) { 4154 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4155 if (BaseDtor->isDeleted()) 4156 return true; 4157 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4158 AR_accessible) 4159 return true; 4160 } 4161 4162 // Finding the corresponding member in the base should lead to a 4163 // unique, accessible, non-deleted function. 4164 if (CSM != CXXDestructor) { 4165 SpecialMemberOverloadResult *SMOR = 4166 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, IsMove, false, 4167 false); 4168 if (!SMOR->hasSuccess()) 4169 return true; 4170 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4171 if (IsConstructor) { 4172 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4173 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4174 PDiag()) != AR_accessible) 4175 return true; 4176 } 4177 } 4178 } 4179 4180 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4181 BE = RD->vbases_end(); 4182 BI != BE; ++BI) { 4183 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4184 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4185 4186 // Unless we have an assignment operator, the base's destructor must 4187 // be accessible and not deleted. 4188 if (!IsAssignment) { 4189 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4190 if (BaseDtor->isDeleted()) 4191 return true; 4192 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4193 AR_accessible) 4194 return true; 4195 } 4196 4197 // Finding the corresponding member in the base should lead to a 4198 // unique, accessible, non-deleted function. 4199 if (CSM != CXXDestructor) { 4200 SpecialMemberOverloadResult *SMOR = 4201 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, IsMove, false, 4202 false); 4203 if (!SMOR->hasSuccess()) 4204 return true; 4205 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4206 if (IsConstructor) { 4207 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4208 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4209 PDiag()) != AR_accessible) 4210 return true; 4211 } 4212 } 4213 } 4214 4215 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4216 FE = RD->field_end(); 4217 FI != FE; ++FI) { 4218 if (FI->isInvalidDecl() || FI->isUnnamedBitfield()) 4219 continue; 4220 4221 QualType FieldType = Context.getBaseElementType(FI->getType()); 4222 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4223 4224 // For a default constructor, all references must be initialized in-class 4225 // and, if a union, it must have a non-const member. 4226 if (CSM == CXXDefaultConstructor) { 4227 if (FieldType->isReferenceType() && !FI->hasInClassInitializer()) 4228 return true; 4229 4230 if (IsUnion && !FieldType.isConstQualified()) 4231 AllConst = false; 4232 } 4233 4234 if (FieldRecord) { 4235 // Unless we're doing assignment, the field's destructor must be 4236 // accessible and not deleted. 4237 if (!IsAssignment) { 4238 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4239 if (FieldDtor->isDeleted()) 4240 return true; 4241 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4242 AR_accessible) 4243 return true; 4244 } 4245 4246 // For a default constructor, a const member must have a user-provided 4247 // default constructor or else be explicitly initialized. 4248 if (CSM == CXXDefaultConstructor && FieldType.isConstQualified() && 4249 !FI->hasInClassInitializer() && 4250 !FieldRecord->hasUserProvidedDefaultConstructor()) 4251 return true; 4252 4253 // For a default constructor, additional restrictions exist on the 4254 // variant members. 4255 if (CSM == CXXDefaultConstructor && !IsUnion && FieldRecord->isUnion() && 4256 FieldRecord->isAnonymousStructOrUnion()) { 4257 // We're okay to reuse AllConst here since we only care about the 4258 // value otherwise if we're in a union. 4259 AllConst = true; 4260 4261 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4262 UE = FieldRecord->field_end(); 4263 UI != UE; ++UI) { 4264 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4265 CXXRecordDecl *UnionFieldRecord = 4266 UnionFieldType->getAsCXXRecordDecl(); 4267 4268 if (!UnionFieldType.isConstQualified()) 4269 AllConst = false; 4270 4271 if (UnionFieldRecord && 4272 !UnionFieldRecord->hasTrivialDefaultConstructor()) 4273 return true; 4274 } 4275 4276 if (AllConst) 4277 return true; 4278 4279 // Don't try to initialize the anonymous union 4280 // This is technically non-conformant, but sanity demands it. 4281 continue; 4282 } 4283 4284 // Check that the corresponding member of the field is accessible, 4285 // unique, and non-deleted. We don't do this if it has an explicit 4286 // initialization when default-constructing. 4287 if (CSM != CXXDestructor && 4288 (CSM != CXXDefaultConstructor || !FI->hasInClassInitializer())) { 4289 SpecialMemberOverloadResult *SMOR = 4290 LookupSpecialMember(FieldRecord, CSM, ConstArg, false, IsMove, false, 4291 false); 4292 if (!SMOR->hasSuccess()) 4293 return true; 4294 4295 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4296 if (IsConstructor) { 4297 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4298 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4299 PDiag()) != AR_accessible) 4300 return true; 4301 } 4302 4303 // We need the corresponding member of a union to be trivial so that 4304 // we can safely copy them all simultaneously. 4305 // FIXME: Note that performing the check here (where we rely on the lack 4306 // of an in-class initializer) is technically ill-formed. However, this 4307 // seems most obviously to be a bug in the standard. 4308 if (IsUnion && !FieldMember->isTrivial()) 4309 return true; 4310 } 4311 } else if (CSM == CXXDefaultConstructor && !IsUnion && 4312 FieldType.isConstQualified() && !FI->hasInClassInitializer()) { 4313 // We can't initialize a const member of non-class type to any value. 4314 return true; 4315 } 4316 } 4317 4318 // We can't have all const members in a union when default-constructing, 4319 // or else they're all nonsensical garbage values that can't be changed. 4320 if (CSM == CXXDefaultConstructor && IsUnion && AllConst) 4321 return true; 4322 4323 return false; 4324} 4325 4326bool Sema::ShouldDeleteCopyConstructor(CXXConstructorDecl *CD) { 4327 CXXRecordDecl *RD = CD->getParent(); 4328 assert(!RD->isDependentType() && "do deletion after instantiation"); 4329 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4330 return false; 4331 4332 SourceLocation Loc = CD->getLocation(); 4333 4334 // Do access control from the constructor 4335 ContextRAII CtorContext(*this, CD); 4336 4337 bool Union = RD->isUnion(); 4338 4339 assert(!CD->getParamDecl(0)->getType()->getPointeeType().isNull() && 4340 "copy assignment arg has no pointee type"); 4341 unsigned ArgQuals = 4342 CD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 4343 Qualifiers::Const : 0; 4344 4345 // We do this because we should never actually use an anonymous 4346 // union's constructor. 4347 if (Union && RD->isAnonymousStructOrUnion()) 4348 return false; 4349 4350 // FIXME: We should put some diagnostic logic right into this function. 4351 4352 // C++0x [class.copy]/11 4353 // A defaulted [copy] constructor for class X is defined as delete if X has: 4354 4355 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4356 BE = RD->bases_end(); 4357 BI != BE; ++BI) { 4358 // We'll handle this one later 4359 if (BI->isVirtual()) 4360 continue; 4361 4362 QualType BaseType = BI->getType(); 4363 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4364 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4365 4366 // -- any [direct base class] of a type with a destructor that is deleted or 4367 // inaccessible from the defaulted constructor 4368 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4369 if (BaseDtor->isDeleted()) 4370 return true; 4371 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4372 AR_accessible) 4373 return true; 4374 4375 // -- a [direct base class] B that cannot be [copied] because overload 4376 // resolution, as applied to B's [copy] constructor, results in an 4377 // ambiguity or a function that is deleted or inaccessible from the 4378 // defaulted constructor 4379 CXXConstructorDecl *BaseCtor = LookupCopyingConstructor(BaseDecl, ArgQuals); 4380 if (!BaseCtor || BaseCtor->isDeleted()) 4381 return true; 4382 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 4383 AR_accessible) 4384 return true; 4385 } 4386 4387 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4388 BE = RD->vbases_end(); 4389 BI != BE; ++BI) { 4390 QualType BaseType = BI->getType(); 4391 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4392 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4393 4394 // -- any [virtual base class] of a type with a destructor that is deleted or 4395 // inaccessible from the defaulted constructor 4396 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4397 if (BaseDtor->isDeleted()) 4398 return true; 4399 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4400 AR_accessible) 4401 return true; 4402 4403 // -- a [virtual base class] B that cannot be [copied] because overload 4404 // resolution, as applied to B's [copy] constructor, results in an 4405 // ambiguity or a function that is deleted or inaccessible from the 4406 // defaulted constructor 4407 CXXConstructorDecl *BaseCtor = LookupCopyingConstructor(BaseDecl, ArgQuals); 4408 if (!BaseCtor || BaseCtor->isDeleted()) 4409 return true; 4410 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 4411 AR_accessible) 4412 return true; 4413 } 4414 4415 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4416 FE = RD->field_end(); 4417 FI != FE; ++FI) { 4418 if (FI->isUnnamedBitfield()) 4419 continue; 4420 4421 QualType FieldType = Context.getBaseElementType(FI->getType()); 4422 4423 // -- for a copy constructor, a non-static data member of rvalue reference 4424 // type 4425 if (FieldType->isRValueReferenceType()) 4426 return true; 4427 4428 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4429 4430 if (FieldRecord) { 4431 // This is an anonymous union 4432 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4433 // Anonymous unions inside unions do not variant members create 4434 if (!Union) { 4435 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4436 UE = FieldRecord->field_end(); 4437 UI != UE; ++UI) { 4438 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4439 CXXRecordDecl *UnionFieldRecord = 4440 UnionFieldType->getAsCXXRecordDecl(); 4441 4442 // -- a variant member with a non-trivial [copy] constructor and X 4443 // is a union-like class 4444 if (UnionFieldRecord && 4445 !UnionFieldRecord->hasTrivialCopyConstructor()) 4446 return true; 4447 } 4448 } 4449 4450 // Don't try to initalize an anonymous union 4451 continue; 4452 } else { 4453 // -- a variant member with a non-trivial [copy] constructor and X is a 4454 // union-like class 4455 if (Union && !FieldRecord->hasTrivialCopyConstructor()) 4456 return true; 4457 4458 // -- any [non-static data member] of a type with a destructor that is 4459 // deleted or inaccessible from the defaulted constructor 4460 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4461 if (FieldDtor->isDeleted()) 4462 return true; 4463 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4464 AR_accessible) 4465 return true; 4466 } 4467 4468 // -- a [non-static data member of class type (or array thereof)] B that 4469 // cannot be [copied] because overload resolution, as applied to B's 4470 // [copy] constructor, results in an ambiguity or a function that is 4471 // deleted or inaccessible from the defaulted constructor 4472 CXXConstructorDecl *FieldCtor = LookupCopyingConstructor(FieldRecord, 4473 ArgQuals); 4474 if (!FieldCtor || FieldCtor->isDeleted()) 4475 return true; 4476 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4477 PDiag()) != AR_accessible) 4478 return true; 4479 } 4480 } 4481 4482 return false; 4483} 4484 4485bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) { 4486 CXXRecordDecl *RD = MD->getParent(); 4487 assert(!RD->isDependentType() && "do deletion after instantiation"); 4488 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4489 return false; 4490 4491 SourceLocation Loc = MD->getLocation(); 4492 4493 // Do access control from the constructor 4494 ContextRAII MethodContext(*this, MD); 4495 4496 bool Union = RD->isUnion(); 4497 4498 unsigned ArgQuals = 4499 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 4500 Qualifiers::Const : 0; 4501 4502 // We do this because we should never actually use an anonymous 4503 // union's constructor. 4504 if (Union && RD->isAnonymousStructOrUnion()) 4505 return false; 4506 4507 // FIXME: We should put some diagnostic logic right into this function. 4508 4509 // C++0x [class.copy]/20 4510 // A defaulted [copy] assignment operator for class X is defined as deleted 4511 // if X has: 4512 4513 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4514 BE = RD->bases_end(); 4515 BI != BE; ++BI) { 4516 // We'll handle this one later 4517 if (BI->isVirtual()) 4518 continue; 4519 4520 QualType BaseType = BI->getType(); 4521 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4522 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4523 4524 // -- a [direct base class] B that cannot be [copied] because overload 4525 // resolution, as applied to B's [copy] assignment operator, results in 4526 // an ambiguity or a function that is deleted or inaccessible from the 4527 // assignment operator 4528 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4529 0); 4530 if (!CopyOper || CopyOper->isDeleted()) 4531 return true; 4532 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4533 return true; 4534 } 4535 4536 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4537 BE = RD->vbases_end(); 4538 BI != BE; ++BI) { 4539 QualType BaseType = BI->getType(); 4540 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4541 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4542 4543 // -- a [virtual base class] B that cannot be [copied] because overload 4544 // resolution, as applied to B's [copy] assignment operator, results in 4545 // an ambiguity or a function that is deleted or inaccessible from the 4546 // assignment operator 4547 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4548 0); 4549 if (!CopyOper || CopyOper->isDeleted()) 4550 return true; 4551 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4552 return true; 4553 } 4554 4555 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4556 FE = RD->field_end(); 4557 FI != FE; ++FI) { 4558 if (FI->isUnnamedBitfield()) 4559 continue; 4560 4561 QualType FieldType = Context.getBaseElementType(FI->getType()); 4562 4563 // -- a non-static data member of reference type 4564 if (FieldType->isReferenceType()) 4565 return true; 4566 4567 // -- a non-static data member of const non-class type (or array thereof) 4568 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4569 return true; 4570 4571 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4572 4573 if (FieldRecord) { 4574 // This is an anonymous union 4575 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4576 // Anonymous unions inside unions do not variant members create 4577 if (!Union) { 4578 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4579 UE = FieldRecord->field_end(); 4580 UI != UE; ++UI) { 4581 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4582 CXXRecordDecl *UnionFieldRecord = 4583 UnionFieldType->getAsCXXRecordDecl(); 4584 4585 // -- a variant member with a non-trivial [copy] assignment operator 4586 // and X is a union-like class 4587 if (UnionFieldRecord && 4588 !UnionFieldRecord->hasTrivialCopyAssignment()) 4589 return true; 4590 } 4591 } 4592 4593 // Don't try to initalize an anonymous union 4594 continue; 4595 // -- a variant member with a non-trivial [copy] assignment operator 4596 // and X is a union-like class 4597 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 4598 return true; 4599 } 4600 4601 CXXMethodDecl *CopyOper = LookupCopyingAssignment(FieldRecord, ArgQuals, 4602 false, 0); 4603 if (!CopyOper || CopyOper->isDeleted()) 4604 return true; 4605 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4606 return true; 4607 } 4608 } 4609 4610 return false; 4611} 4612 4613bool Sema::ShouldDeleteMoveConstructor(CXXConstructorDecl *CD) { 4614 CXXRecordDecl *RD = CD->getParent(); 4615 assert(!RD->isDependentType() && "do deletion after instantiation"); 4616 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4617 return false; 4618 4619 SourceLocation Loc = CD->getLocation(); 4620 4621 // Do access control from the constructor 4622 ContextRAII CtorContext(*this, CD); 4623 4624 bool Union = RD->isUnion(); 4625 4626 assert(!CD->getParamDecl(0)->getType()->getPointeeType().isNull() && 4627 "copy assignment arg has no pointee type"); 4628 4629 // We do this because we should never actually use an anonymous 4630 // union's constructor. 4631 if (Union && RD->isAnonymousStructOrUnion()) 4632 return false; 4633 4634 // C++0x [class.copy]/11 4635 // A defaulted [move] constructor for class X is defined as deleted 4636 // if X has: 4637 4638 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4639 BE = RD->bases_end(); 4640 BI != BE; ++BI) { 4641 // We'll handle this one later 4642 if (BI->isVirtual()) 4643 continue; 4644 4645 QualType BaseType = BI->getType(); 4646 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4647 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4648 4649 // -- any [direct base class] of a type with a destructor that is deleted or 4650 // inaccessible from the defaulted constructor 4651 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4652 if (BaseDtor->isDeleted()) 4653 return true; 4654 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4655 AR_accessible) 4656 return true; 4657 4658 // -- a [direct base class] B that cannot be [moved] because overload 4659 // resolution, as applied to B's [move] constructor, results in an 4660 // ambiguity or a function that is deleted or inaccessible from the 4661 // defaulted constructor 4662 CXXConstructorDecl *BaseCtor = LookupMovingConstructor(BaseDecl); 4663 if (!BaseCtor || BaseCtor->isDeleted()) 4664 return true; 4665 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 4666 AR_accessible) 4667 return true; 4668 4669 // -- for a move constructor, a [direct base class] with a type that 4670 // does not have a move constructor and is not trivially copyable. 4671 // If the field isn't a record, it's always trivially copyable. 4672 // A moving constructor could be a copy constructor instead. 4673 if (!BaseCtor->isMoveConstructor() && 4674 !BaseDecl->isTriviallyCopyable()) 4675 return true; 4676 } 4677 4678 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4679 BE = RD->vbases_end(); 4680 BI != BE; ++BI) { 4681 QualType BaseType = BI->getType(); 4682 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4683 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4684 4685 // -- any [virtual base class] of a type with a destructor that is deleted 4686 // or inaccessible from the defaulted constructor 4687 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4688 if (BaseDtor->isDeleted()) 4689 return true; 4690 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4691 AR_accessible) 4692 return true; 4693 4694 // -- a [virtual base class] B that cannot be [moved] because overload 4695 // resolution, as applied to B's [move] constructor, results in an 4696 // ambiguity or a function that is deleted or inaccessible from the 4697 // defaulted constructor 4698 CXXConstructorDecl *BaseCtor = LookupMovingConstructor(BaseDecl); 4699 if (!BaseCtor || BaseCtor->isDeleted()) 4700 return true; 4701 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 4702 AR_accessible) 4703 return true; 4704 4705 // -- for a move constructor, a [virtual base class] with a type that 4706 // does not have a move constructor and is not trivially copyable. 4707 // If the field isn't a record, it's always trivially copyable. 4708 // A moving constructor could be a copy constructor instead. 4709 if (!BaseCtor->isMoveConstructor() && 4710 !BaseDecl->isTriviallyCopyable()) 4711 return true; 4712 } 4713 4714 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4715 FE = RD->field_end(); 4716 FI != FE; ++FI) { 4717 if (FI->isUnnamedBitfield()) 4718 continue; 4719 4720 QualType FieldType = Context.getBaseElementType(FI->getType()); 4721 4722 if (CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl()) { 4723 // This is an anonymous union 4724 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4725 // Anonymous unions inside unions do not variant members create 4726 if (!Union) { 4727 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4728 UE = FieldRecord->field_end(); 4729 UI != UE; ++UI) { 4730 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4731 CXXRecordDecl *UnionFieldRecord = 4732 UnionFieldType->getAsCXXRecordDecl(); 4733 4734 // -- a variant member with a non-trivial [move] constructor and X 4735 // is a union-like class 4736 if (UnionFieldRecord && 4737 !UnionFieldRecord->hasTrivialMoveConstructor()) 4738 return true; 4739 } 4740 } 4741 4742 // Don't try to initalize an anonymous union 4743 continue; 4744 } else { 4745 // -- a variant member with a non-trivial [move] constructor and X is a 4746 // union-like class 4747 if (Union && !FieldRecord->hasTrivialMoveConstructor()) 4748 return true; 4749 4750 // -- any [non-static data member] of a type with a destructor that is 4751 // deleted or inaccessible from the defaulted constructor 4752 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4753 if (FieldDtor->isDeleted()) 4754 return true; 4755 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4756 AR_accessible) 4757 return true; 4758 } 4759 4760 // -- a [non-static data member of class type (or array thereof)] B that 4761 // cannot be [moved] because overload resolution, as applied to B's 4762 // [move] constructor, results in an ambiguity or a function that is 4763 // deleted or inaccessible from the defaulted constructor 4764 CXXConstructorDecl *FieldCtor = LookupMovingConstructor(FieldRecord); 4765 if (!FieldCtor || FieldCtor->isDeleted()) 4766 return true; 4767 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4768 PDiag()) != AR_accessible) 4769 return true; 4770 4771 // -- for a move constructor, a [non-static data member] with a type that 4772 // does not have a move constructor and is not trivially copyable. 4773 // If the field isn't a record, it's always trivially copyable. 4774 // A moving constructor could be a copy constructor instead. 4775 if (!FieldCtor->isMoveConstructor() && 4776 !FieldRecord->isTriviallyCopyable()) 4777 return true; 4778 } 4779 } 4780 4781 return false; 4782} 4783 4784bool Sema::ShouldDeleteMoveAssignmentOperator(CXXMethodDecl *MD) { 4785 CXXRecordDecl *RD = MD->getParent(); 4786 assert(!RD->isDependentType() && "do deletion after instantiation"); 4787 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4788 return false; 4789 4790 SourceLocation Loc = MD->getLocation(); 4791 4792 // Do access control from the constructor 4793 ContextRAII MethodContext(*this, MD); 4794 4795 bool Union = RD->isUnion(); 4796 4797 // We do this because we should never actually use an anonymous 4798 // union's constructor. 4799 if (Union && RD->isAnonymousStructOrUnion()) 4800 return false; 4801 4802 // C++0x [class.copy]/20 4803 // A defaulted [move] assignment operator for class X is defined as deleted 4804 // if X has: 4805 4806 // -- for the move constructor, [...] any direct or indirect virtual base 4807 // class. 4808 if (RD->getNumVBases() != 0) 4809 return true; 4810 4811 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4812 BE = RD->bases_end(); 4813 BI != BE; ++BI) { 4814 4815 QualType BaseType = BI->getType(); 4816 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4817 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4818 4819 // -- a [direct base class] B that cannot be [moved] because overload 4820 // resolution, as applied to B's [move] assignment operator, results in 4821 // an ambiguity or a function that is deleted or inaccessible from the 4822 // assignment operator 4823 CXXMethodDecl *MoveOper = LookupMovingAssignment(BaseDecl, false, 0); 4824 if (!MoveOper || MoveOper->isDeleted()) 4825 return true; 4826 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4827 return true; 4828 4829 // -- for the move assignment operator, a [direct base class] with a type 4830 // that does not have a move assignment operator and is not trivially 4831 // copyable. 4832 if (!MoveOper->isMoveAssignmentOperator() && 4833 !BaseDecl->isTriviallyCopyable()) 4834 return true; 4835 } 4836 4837 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4838 FE = RD->field_end(); 4839 FI != FE; ++FI) { 4840 if (FI->isUnnamedBitfield()) 4841 continue; 4842 4843 QualType FieldType = Context.getBaseElementType(FI->getType()); 4844 4845 // -- a non-static data member of reference type 4846 if (FieldType->isReferenceType()) 4847 return true; 4848 4849 // -- a non-static data member of const non-class type (or array thereof) 4850 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4851 return true; 4852 4853 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4854 4855 if (FieldRecord) { 4856 // This is an anonymous union 4857 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4858 // Anonymous unions inside unions do not variant members create 4859 if (!Union) { 4860 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4861 UE = FieldRecord->field_end(); 4862 UI != UE; ++UI) { 4863 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4864 CXXRecordDecl *UnionFieldRecord = 4865 UnionFieldType->getAsCXXRecordDecl(); 4866 4867 // -- a variant member with a non-trivial [move] assignment operator 4868 // and X is a union-like class 4869 if (UnionFieldRecord && 4870 !UnionFieldRecord->hasTrivialMoveAssignment()) 4871 return true; 4872 } 4873 } 4874 4875 // Don't try to initalize an anonymous union 4876 continue; 4877 // -- a variant member with a non-trivial [move] assignment operator 4878 // and X is a union-like class 4879 } else if (Union && !FieldRecord->hasTrivialMoveAssignment()) { 4880 return true; 4881 } 4882 4883 CXXMethodDecl *MoveOper = LookupMovingAssignment(FieldRecord, false, 0); 4884 if (!MoveOper || MoveOper->isDeleted()) 4885 return true; 4886 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4887 return true; 4888 4889 // -- for the move assignment operator, a [non-static data member] with a 4890 // type that does not have a move assignment operator and is not 4891 // trivially copyable. 4892 if (!MoveOper->isMoveAssignmentOperator() && 4893 !FieldRecord->isTriviallyCopyable()) 4894 return true; 4895 } 4896 } 4897 4898 return false; 4899} 4900 4901bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 4902 CXXRecordDecl *RD = DD->getParent(); 4903 assert(!RD->isDependentType() && "do deletion after instantiation"); 4904 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4905 return false; 4906 4907 SourceLocation Loc = DD->getLocation(); 4908 4909 // Do access control from the destructor 4910 ContextRAII CtorContext(*this, DD); 4911 4912 bool Union = RD->isUnion(); 4913 4914 // We do this because we should never actually use an anonymous 4915 // union's destructor. 4916 if (Union && RD->isAnonymousStructOrUnion()) 4917 return false; 4918 4919 // C++0x [class.dtor]p5 4920 // A defaulted destructor for a class X is defined as deleted if: 4921 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4922 BE = RD->bases_end(); 4923 BI != BE; ++BI) { 4924 // We'll handle this one later 4925 if (BI->isVirtual()) 4926 continue; 4927 4928 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4929 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4930 assert(BaseDtor && "base has no destructor"); 4931 4932 // -- any direct or virtual base class has a deleted destructor or 4933 // a destructor that is inaccessible from the defaulted destructor 4934 if (BaseDtor->isDeleted()) 4935 return true; 4936 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4937 AR_accessible) 4938 return true; 4939 } 4940 4941 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4942 BE = RD->vbases_end(); 4943 BI != BE; ++BI) { 4944 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4945 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4946 assert(BaseDtor && "base has no destructor"); 4947 4948 // -- any direct or virtual base class has a deleted destructor or 4949 // a destructor that is inaccessible from the defaulted destructor 4950 if (BaseDtor->isDeleted()) 4951 return true; 4952 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4953 AR_accessible) 4954 return true; 4955 } 4956 4957 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4958 FE = RD->field_end(); 4959 FI != FE; ++FI) { 4960 QualType FieldType = Context.getBaseElementType(FI->getType()); 4961 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4962 if (FieldRecord) { 4963 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4964 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4965 UE = FieldRecord->field_end(); 4966 UI != UE; ++UI) { 4967 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 4968 CXXRecordDecl *UnionFieldRecord = 4969 UnionFieldType->getAsCXXRecordDecl(); 4970 4971 // -- X is a union-like class that has a variant member with a non- 4972 // trivial destructor. 4973 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 4974 return true; 4975 } 4976 // Technically we are supposed to do this next check unconditionally. 4977 // But that makes absolutely no sense. 4978 } else { 4979 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4980 4981 // -- any of the non-static data members has class type M (or array 4982 // thereof) and M has a deleted destructor or a destructor that is 4983 // inaccessible from the defaulted destructor 4984 if (FieldDtor->isDeleted()) 4985 return true; 4986 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4987 AR_accessible) 4988 return true; 4989 4990 // -- X is a union-like class that has a variant member with a non- 4991 // trivial destructor. 4992 if (Union && !FieldDtor->isTrivial()) 4993 return true; 4994 } 4995 } 4996 } 4997 4998 if (DD->isVirtual()) { 4999 FunctionDecl *OperatorDelete = 0; 5000 DeclarationName Name = 5001 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5002 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete, 5003 false)) 5004 return true; 5005 } 5006 5007 5008 return false; 5009} 5010 5011/// \brief Data used with FindHiddenVirtualMethod 5012namespace { 5013 struct FindHiddenVirtualMethodData { 5014 Sema *S; 5015 CXXMethodDecl *Method; 5016 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 5017 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 5018 }; 5019} 5020 5021/// \brief Member lookup function that determines whether a given C++ 5022/// method overloads virtual methods in a base class without overriding any, 5023/// to be used with CXXRecordDecl::lookupInBases(). 5024static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 5025 CXXBasePath &Path, 5026 void *UserData) { 5027 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 5028 5029 FindHiddenVirtualMethodData &Data 5030 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 5031 5032 DeclarationName Name = Data.Method->getDeclName(); 5033 assert(Name.getNameKind() == DeclarationName::Identifier); 5034 5035 bool foundSameNameMethod = false; 5036 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 5037 for (Path.Decls = BaseRecord->lookup(Name); 5038 Path.Decls.first != Path.Decls.second; 5039 ++Path.Decls.first) { 5040 NamedDecl *D = *Path.Decls.first; 5041 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 5042 MD = MD->getCanonicalDecl(); 5043 foundSameNameMethod = true; 5044 // Interested only in hidden virtual methods. 5045 if (!MD->isVirtual()) 5046 continue; 5047 // If the method we are checking overrides a method from its base 5048 // don't warn about the other overloaded methods. 5049 if (!Data.S->IsOverload(Data.Method, MD, false)) 5050 return true; 5051 // Collect the overload only if its hidden. 5052 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 5053 overloadedMethods.push_back(MD); 5054 } 5055 } 5056 5057 if (foundSameNameMethod) 5058 Data.OverloadedMethods.append(overloadedMethods.begin(), 5059 overloadedMethods.end()); 5060 return foundSameNameMethod; 5061} 5062 5063/// \brief See if a method overloads virtual methods in a base class without 5064/// overriding any. 5065void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 5066 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 5067 MD->getLocation()) == DiagnosticsEngine::Ignored) 5068 return; 5069 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 5070 return; 5071 5072 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 5073 /*bool RecordPaths=*/false, 5074 /*bool DetectVirtual=*/false); 5075 FindHiddenVirtualMethodData Data; 5076 Data.Method = MD; 5077 Data.S = this; 5078 5079 // Keep the base methods that were overriden or introduced in the subclass 5080 // by 'using' in a set. A base method not in this set is hidden. 5081 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 5082 res.first != res.second; ++res.first) { 5083 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 5084 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 5085 E = MD->end_overridden_methods(); 5086 I != E; ++I) 5087 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 5088 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 5089 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 5090 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 5091 } 5092 5093 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 5094 !Data.OverloadedMethods.empty()) { 5095 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 5096 << MD << (Data.OverloadedMethods.size() > 1); 5097 5098 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 5099 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 5100 Diag(overloadedMD->getLocation(), 5101 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 5102 } 5103 } 5104} 5105 5106void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 5107 Decl *TagDecl, 5108 SourceLocation LBrac, 5109 SourceLocation RBrac, 5110 AttributeList *AttrList) { 5111 if (!TagDecl) 5112 return; 5113 5114 AdjustDeclIfTemplate(TagDecl); 5115 5116 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 5117 // strict aliasing violation! 5118 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 5119 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 5120 5121 CheckCompletedCXXClass( 5122 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 5123} 5124 5125/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 5126/// special functions, such as the default constructor, copy 5127/// constructor, or destructor, to the given C++ class (C++ 5128/// [special]p1). This routine can only be executed just before the 5129/// definition of the class is complete. 5130void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 5131 if (!ClassDecl->hasUserDeclaredConstructor()) 5132 ++ASTContext::NumImplicitDefaultConstructors; 5133 5134 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 5135 ++ASTContext::NumImplicitCopyConstructors; 5136 5137 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 5138 ++ASTContext::NumImplicitCopyAssignmentOperators; 5139 5140 // If we have a dynamic class, then the copy assignment operator may be 5141 // virtual, so we have to declare it immediately. This ensures that, e.g., 5142 // it shows up in the right place in the vtable and that we diagnose 5143 // problems with the implicit exception specification. 5144 if (ClassDecl->isDynamicClass()) 5145 DeclareImplicitCopyAssignment(ClassDecl); 5146 } 5147 5148 if (!ClassDecl->hasUserDeclaredDestructor()) { 5149 ++ASTContext::NumImplicitDestructors; 5150 5151 // If we have a dynamic class, then the destructor may be virtual, so we 5152 // have to declare the destructor immediately. This ensures that, e.g., it 5153 // shows up in the right place in the vtable and that we diagnose problems 5154 // with the implicit exception specification. 5155 if (ClassDecl->isDynamicClass()) 5156 DeclareImplicitDestructor(ClassDecl); 5157 } 5158} 5159 5160void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 5161 if (!D) 5162 return; 5163 5164 int NumParamList = D->getNumTemplateParameterLists(); 5165 for (int i = 0; i < NumParamList; i++) { 5166 TemplateParameterList* Params = D->getTemplateParameterList(i); 5167 for (TemplateParameterList::iterator Param = Params->begin(), 5168 ParamEnd = Params->end(); 5169 Param != ParamEnd; ++Param) { 5170 NamedDecl *Named = cast<NamedDecl>(*Param); 5171 if (Named->getDeclName()) { 5172 S->AddDecl(Named); 5173 IdResolver.AddDecl(Named); 5174 } 5175 } 5176 } 5177} 5178 5179void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 5180 if (!D) 5181 return; 5182 5183 TemplateParameterList *Params = 0; 5184 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 5185 Params = Template->getTemplateParameters(); 5186 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 5187 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 5188 Params = PartialSpec->getTemplateParameters(); 5189 else 5190 return; 5191 5192 for (TemplateParameterList::iterator Param = Params->begin(), 5193 ParamEnd = Params->end(); 5194 Param != ParamEnd; ++Param) { 5195 NamedDecl *Named = cast<NamedDecl>(*Param); 5196 if (Named->getDeclName()) { 5197 S->AddDecl(Named); 5198 IdResolver.AddDecl(Named); 5199 } 5200 } 5201} 5202 5203void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5204 if (!RecordD) return; 5205 AdjustDeclIfTemplate(RecordD); 5206 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 5207 PushDeclContext(S, Record); 5208} 5209 5210void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5211 if (!RecordD) return; 5212 PopDeclContext(); 5213} 5214 5215/// ActOnStartDelayedCXXMethodDeclaration - We have completed 5216/// parsing a top-level (non-nested) C++ class, and we are now 5217/// parsing those parts of the given Method declaration that could 5218/// not be parsed earlier (C++ [class.mem]p2), such as default 5219/// arguments. This action should enter the scope of the given 5220/// Method declaration as if we had just parsed the qualified method 5221/// name. However, it should not bring the parameters into scope; 5222/// that will be performed by ActOnDelayedCXXMethodParameter. 5223void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5224} 5225 5226/// ActOnDelayedCXXMethodParameter - We've already started a delayed 5227/// C++ method declaration. We're (re-)introducing the given 5228/// function parameter into scope for use in parsing later parts of 5229/// the method declaration. For example, we could see an 5230/// ActOnParamDefaultArgument event for this parameter. 5231void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 5232 if (!ParamD) 5233 return; 5234 5235 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 5236 5237 // If this parameter has an unparsed default argument, clear it out 5238 // to make way for the parsed default argument. 5239 if (Param->hasUnparsedDefaultArg()) 5240 Param->setDefaultArg(0); 5241 5242 S->AddDecl(Param); 5243 if (Param->getDeclName()) 5244 IdResolver.AddDecl(Param); 5245} 5246 5247/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 5248/// processing the delayed method declaration for Method. The method 5249/// declaration is now considered finished. There may be a separate 5250/// ActOnStartOfFunctionDef action later (not necessarily 5251/// immediately!) for this method, if it was also defined inside the 5252/// class body. 5253void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5254 if (!MethodD) 5255 return; 5256 5257 AdjustDeclIfTemplate(MethodD); 5258 5259 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5260 5261 // Now that we have our default arguments, check the constructor 5262 // again. It could produce additional diagnostics or affect whether 5263 // the class has implicitly-declared destructors, among other 5264 // things. 5265 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5266 CheckConstructor(Constructor); 5267 5268 // Check the default arguments, which we may have added. 5269 if (!Method->isInvalidDecl()) 5270 CheckCXXDefaultArguments(Method); 5271} 5272 5273/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5274/// the well-formedness of the constructor declarator @p D with type @p 5275/// R. If there are any errors in the declarator, this routine will 5276/// emit diagnostics and set the invalid bit to true. In any case, the type 5277/// will be updated to reflect a well-formed type for the constructor and 5278/// returned. 5279QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5280 StorageClass &SC) { 5281 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5282 5283 // C++ [class.ctor]p3: 5284 // A constructor shall not be virtual (10.3) or static (9.4). A 5285 // constructor can be invoked for a const, volatile or const 5286 // volatile object. A constructor shall not be declared const, 5287 // volatile, or const volatile (9.3.2). 5288 if (isVirtual) { 5289 if (!D.isInvalidType()) 5290 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5291 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5292 << SourceRange(D.getIdentifierLoc()); 5293 D.setInvalidType(); 5294 } 5295 if (SC == SC_Static) { 5296 if (!D.isInvalidType()) 5297 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5298 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5299 << SourceRange(D.getIdentifierLoc()); 5300 D.setInvalidType(); 5301 SC = SC_None; 5302 } 5303 5304 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5305 if (FTI.TypeQuals != 0) { 5306 if (FTI.TypeQuals & Qualifiers::Const) 5307 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5308 << "const" << SourceRange(D.getIdentifierLoc()); 5309 if (FTI.TypeQuals & Qualifiers::Volatile) 5310 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5311 << "volatile" << SourceRange(D.getIdentifierLoc()); 5312 if (FTI.TypeQuals & Qualifiers::Restrict) 5313 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5314 << "restrict" << SourceRange(D.getIdentifierLoc()); 5315 D.setInvalidType(); 5316 } 5317 5318 // C++0x [class.ctor]p4: 5319 // A constructor shall not be declared with a ref-qualifier. 5320 if (FTI.hasRefQualifier()) { 5321 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5322 << FTI.RefQualifierIsLValueRef 5323 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5324 D.setInvalidType(); 5325 } 5326 5327 // Rebuild the function type "R" without any type qualifiers (in 5328 // case any of the errors above fired) and with "void" as the 5329 // return type, since constructors don't have return types. 5330 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5331 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5332 return R; 5333 5334 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5335 EPI.TypeQuals = 0; 5336 EPI.RefQualifier = RQ_None; 5337 5338 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5339 Proto->getNumArgs(), EPI); 5340} 5341 5342/// CheckConstructor - Checks a fully-formed constructor for 5343/// well-formedness, issuing any diagnostics required. Returns true if 5344/// the constructor declarator is invalid. 5345void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5346 CXXRecordDecl *ClassDecl 5347 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5348 if (!ClassDecl) 5349 return Constructor->setInvalidDecl(); 5350 5351 // C++ [class.copy]p3: 5352 // A declaration of a constructor for a class X is ill-formed if 5353 // its first parameter is of type (optionally cv-qualified) X and 5354 // either there are no other parameters or else all other 5355 // parameters have default arguments. 5356 if (!Constructor->isInvalidDecl() && 5357 ((Constructor->getNumParams() == 1) || 5358 (Constructor->getNumParams() > 1 && 5359 Constructor->getParamDecl(1)->hasDefaultArg())) && 5360 Constructor->getTemplateSpecializationKind() 5361 != TSK_ImplicitInstantiation) { 5362 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5363 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5364 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5365 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5366 const char *ConstRef 5367 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5368 : " const &"; 5369 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5370 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5371 5372 // FIXME: Rather that making the constructor invalid, we should endeavor 5373 // to fix the type. 5374 Constructor->setInvalidDecl(); 5375 } 5376 } 5377} 5378 5379/// CheckDestructor - Checks a fully-formed destructor definition for 5380/// well-formedness, issuing any diagnostics required. Returns true 5381/// on error. 5382bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5383 CXXRecordDecl *RD = Destructor->getParent(); 5384 5385 if (Destructor->isVirtual()) { 5386 SourceLocation Loc; 5387 5388 if (!Destructor->isImplicit()) 5389 Loc = Destructor->getLocation(); 5390 else 5391 Loc = RD->getLocation(); 5392 5393 // If we have a virtual destructor, look up the deallocation function 5394 FunctionDecl *OperatorDelete = 0; 5395 DeclarationName Name = 5396 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5397 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5398 return true; 5399 5400 MarkDeclarationReferenced(Loc, OperatorDelete); 5401 5402 Destructor->setOperatorDelete(OperatorDelete); 5403 } 5404 5405 return false; 5406} 5407 5408static inline bool 5409FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5410 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5411 FTI.ArgInfo[0].Param && 5412 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5413} 5414 5415/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5416/// the well-formednes of the destructor declarator @p D with type @p 5417/// R. If there are any errors in the declarator, this routine will 5418/// emit diagnostics and set the declarator to invalid. Even if this happens, 5419/// will be updated to reflect a well-formed type for the destructor and 5420/// returned. 5421QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5422 StorageClass& SC) { 5423 // C++ [class.dtor]p1: 5424 // [...] A typedef-name that names a class is a class-name 5425 // (7.1.3); however, a typedef-name that names a class shall not 5426 // be used as the identifier in the declarator for a destructor 5427 // declaration. 5428 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5429 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5430 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5431 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5432 else if (const TemplateSpecializationType *TST = 5433 DeclaratorType->getAs<TemplateSpecializationType>()) 5434 if (TST->isTypeAlias()) 5435 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5436 << DeclaratorType << 1; 5437 5438 // C++ [class.dtor]p2: 5439 // A destructor is used to destroy objects of its class type. A 5440 // destructor takes no parameters, and no return type can be 5441 // specified for it (not even void). The address of a destructor 5442 // shall not be taken. A destructor shall not be static. A 5443 // destructor can be invoked for a const, volatile or const 5444 // volatile object. A destructor shall not be declared const, 5445 // volatile or const volatile (9.3.2). 5446 if (SC == SC_Static) { 5447 if (!D.isInvalidType()) 5448 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5449 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5450 << SourceRange(D.getIdentifierLoc()) 5451 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5452 5453 SC = SC_None; 5454 } 5455 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5456 // Destructors don't have return types, but the parser will 5457 // happily parse something like: 5458 // 5459 // class X { 5460 // float ~X(); 5461 // }; 5462 // 5463 // The return type will be eliminated later. 5464 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5465 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5466 << SourceRange(D.getIdentifierLoc()); 5467 } 5468 5469 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5470 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5471 if (FTI.TypeQuals & Qualifiers::Const) 5472 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5473 << "const" << SourceRange(D.getIdentifierLoc()); 5474 if (FTI.TypeQuals & Qualifiers::Volatile) 5475 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5476 << "volatile" << SourceRange(D.getIdentifierLoc()); 5477 if (FTI.TypeQuals & Qualifiers::Restrict) 5478 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5479 << "restrict" << SourceRange(D.getIdentifierLoc()); 5480 D.setInvalidType(); 5481 } 5482 5483 // C++0x [class.dtor]p2: 5484 // A destructor shall not be declared with a ref-qualifier. 5485 if (FTI.hasRefQualifier()) { 5486 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5487 << FTI.RefQualifierIsLValueRef 5488 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5489 D.setInvalidType(); 5490 } 5491 5492 // Make sure we don't have any parameters. 5493 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5494 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5495 5496 // Delete the parameters. 5497 FTI.freeArgs(); 5498 D.setInvalidType(); 5499 } 5500 5501 // Make sure the destructor isn't variadic. 5502 if (FTI.isVariadic) { 5503 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5504 D.setInvalidType(); 5505 } 5506 5507 // Rebuild the function type "R" without any type qualifiers or 5508 // parameters (in case any of the errors above fired) and with 5509 // "void" as the return type, since destructors don't have return 5510 // types. 5511 if (!D.isInvalidType()) 5512 return R; 5513 5514 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5515 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5516 EPI.Variadic = false; 5517 EPI.TypeQuals = 0; 5518 EPI.RefQualifier = RQ_None; 5519 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5520} 5521 5522/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5523/// well-formednes of the conversion function declarator @p D with 5524/// type @p R. If there are any errors in the declarator, this routine 5525/// will emit diagnostics and return true. Otherwise, it will return 5526/// false. Either way, the type @p R will be updated to reflect a 5527/// well-formed type for the conversion operator. 5528void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5529 StorageClass& SC) { 5530 // C++ [class.conv.fct]p1: 5531 // Neither parameter types nor return type can be specified. The 5532 // type of a conversion function (8.3.5) is "function taking no 5533 // parameter returning conversion-type-id." 5534 if (SC == SC_Static) { 5535 if (!D.isInvalidType()) 5536 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5537 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5538 << SourceRange(D.getIdentifierLoc()); 5539 D.setInvalidType(); 5540 SC = SC_None; 5541 } 5542 5543 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5544 5545 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5546 // Conversion functions don't have return types, but the parser will 5547 // happily parse something like: 5548 // 5549 // class X { 5550 // float operator bool(); 5551 // }; 5552 // 5553 // The return type will be changed later anyway. 5554 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5555 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5556 << SourceRange(D.getIdentifierLoc()); 5557 D.setInvalidType(); 5558 } 5559 5560 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5561 5562 // Make sure we don't have any parameters. 5563 if (Proto->getNumArgs() > 0) { 5564 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5565 5566 // Delete the parameters. 5567 D.getFunctionTypeInfo().freeArgs(); 5568 D.setInvalidType(); 5569 } else if (Proto->isVariadic()) { 5570 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5571 D.setInvalidType(); 5572 } 5573 5574 // Diagnose "&operator bool()" and other such nonsense. This 5575 // is actually a gcc extension which we don't support. 5576 if (Proto->getResultType() != ConvType) { 5577 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5578 << Proto->getResultType(); 5579 D.setInvalidType(); 5580 ConvType = Proto->getResultType(); 5581 } 5582 5583 // C++ [class.conv.fct]p4: 5584 // The conversion-type-id shall not represent a function type nor 5585 // an array type. 5586 if (ConvType->isArrayType()) { 5587 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5588 ConvType = Context.getPointerType(ConvType); 5589 D.setInvalidType(); 5590 } else if (ConvType->isFunctionType()) { 5591 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5592 ConvType = Context.getPointerType(ConvType); 5593 D.setInvalidType(); 5594 } 5595 5596 // Rebuild the function type "R" without any parameters (in case any 5597 // of the errors above fired) and with the conversion type as the 5598 // return type. 5599 if (D.isInvalidType()) 5600 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5601 5602 // C++0x explicit conversion operators. 5603 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 5604 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5605 diag::warn_explicit_conversion_functions) 5606 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5607} 5608 5609/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5610/// the declaration of the given C++ conversion function. This routine 5611/// is responsible for recording the conversion function in the C++ 5612/// class, if possible. 5613Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5614 assert(Conversion && "Expected to receive a conversion function declaration"); 5615 5616 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5617 5618 // Make sure we aren't redeclaring the conversion function. 5619 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5620 5621 // C++ [class.conv.fct]p1: 5622 // [...] A conversion function is never used to convert a 5623 // (possibly cv-qualified) object to the (possibly cv-qualified) 5624 // same object type (or a reference to it), to a (possibly 5625 // cv-qualified) base class of that type (or a reference to it), 5626 // or to (possibly cv-qualified) void. 5627 // FIXME: Suppress this warning if the conversion function ends up being a 5628 // virtual function that overrides a virtual function in a base class. 5629 QualType ClassType 5630 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5631 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5632 ConvType = ConvTypeRef->getPointeeType(); 5633 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5634 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5635 /* Suppress diagnostics for instantiations. */; 5636 else if (ConvType->isRecordType()) { 5637 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5638 if (ConvType == ClassType) 5639 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5640 << ClassType; 5641 else if (IsDerivedFrom(ClassType, ConvType)) 5642 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5643 << ClassType << ConvType; 5644 } else if (ConvType->isVoidType()) { 5645 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5646 << ClassType << ConvType; 5647 } 5648 5649 if (FunctionTemplateDecl *ConversionTemplate 5650 = Conversion->getDescribedFunctionTemplate()) 5651 return ConversionTemplate; 5652 5653 return Conversion; 5654} 5655 5656//===----------------------------------------------------------------------===// 5657// Namespace Handling 5658//===----------------------------------------------------------------------===// 5659 5660 5661 5662/// ActOnStartNamespaceDef - This is called at the start of a namespace 5663/// definition. 5664Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5665 SourceLocation InlineLoc, 5666 SourceLocation NamespaceLoc, 5667 SourceLocation IdentLoc, 5668 IdentifierInfo *II, 5669 SourceLocation LBrace, 5670 AttributeList *AttrList) { 5671 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5672 // For anonymous namespace, take the location of the left brace. 5673 SourceLocation Loc = II ? IdentLoc : LBrace; 5674 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 5675 StartLoc, Loc, II); 5676 Namespc->setInline(InlineLoc.isValid()); 5677 5678 Scope *DeclRegionScope = NamespcScope->getParent(); 5679 5680 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5681 5682 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5683 PushNamespaceVisibilityAttr(Attr); 5684 5685 if (II) { 5686 // C++ [namespace.def]p2: 5687 // The identifier in an original-namespace-definition shall not 5688 // have been previously defined in the declarative region in 5689 // which the original-namespace-definition appears. The 5690 // identifier in an original-namespace-definition is the name of 5691 // the namespace. Subsequently in that declarative region, it is 5692 // treated as an original-namespace-name. 5693 // 5694 // Since namespace names are unique in their scope, and we don't 5695 // look through using directives, just look for any ordinary names. 5696 5697 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5698 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5699 Decl::IDNS_Namespace; 5700 NamedDecl *PrevDecl = 0; 5701 for (DeclContext::lookup_result R 5702 = CurContext->getRedeclContext()->lookup(II); 5703 R.first != R.second; ++R.first) { 5704 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5705 PrevDecl = *R.first; 5706 break; 5707 } 5708 } 5709 5710 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 5711 // This is an extended namespace definition. 5712 if (Namespc->isInline() != OrigNS->isInline()) { 5713 // inline-ness must match 5714 if (OrigNS->isInline()) { 5715 // The user probably just forgot the 'inline', so suggest that it 5716 // be added back. 5717 Diag(Namespc->getLocation(), 5718 diag::warn_inline_namespace_reopened_noninline) 5719 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5720 } else { 5721 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 5722 << Namespc->isInline(); 5723 } 5724 Diag(OrigNS->getLocation(), diag::note_previous_definition); 5725 5726 // Recover by ignoring the new namespace's inline status. 5727 Namespc->setInline(OrigNS->isInline()); 5728 } 5729 5730 // Attach this namespace decl to the chain of extended namespace 5731 // definitions. 5732 OrigNS->setNextNamespace(Namespc); 5733 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 5734 5735 // Remove the previous declaration from the scope. 5736 if (DeclRegionScope->isDeclScope(OrigNS)) { 5737 IdResolver.RemoveDecl(OrigNS); 5738 DeclRegionScope->RemoveDecl(OrigNS); 5739 } 5740 } else if (PrevDecl) { 5741 // This is an invalid name redefinition. 5742 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 5743 << Namespc->getDeclName(); 5744 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5745 Namespc->setInvalidDecl(); 5746 // Continue on to push Namespc as current DeclContext and return it. 5747 } else if (II->isStr("std") && 5748 CurContext->getRedeclContext()->isTranslationUnit()) { 5749 // This is the first "real" definition of the namespace "std", so update 5750 // our cache of the "std" namespace to point at this definition. 5751 if (NamespaceDecl *StdNS = getStdNamespace()) { 5752 // We had already defined a dummy namespace "std". Link this new 5753 // namespace definition to the dummy namespace "std". 5754 StdNS->setNextNamespace(Namespc); 5755 StdNS->setLocation(IdentLoc); 5756 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 5757 } 5758 5759 // Make our StdNamespace cache point at the first real definition of the 5760 // "std" namespace. 5761 StdNamespace = Namespc; 5762 5763 // Add this instance of "std" to the set of known namespaces 5764 KnownNamespaces[Namespc] = false; 5765 } else if (!Namespc->isInline()) { 5766 // Since this is an "original" namespace, add it to the known set of 5767 // namespaces if it is not an inline namespace. 5768 KnownNamespaces[Namespc] = false; 5769 } 5770 5771 PushOnScopeChains(Namespc, DeclRegionScope); 5772 } else { 5773 // Anonymous namespaces. 5774 assert(Namespc->isAnonymousNamespace()); 5775 5776 // Link the anonymous namespace into its parent. 5777 NamespaceDecl *PrevDecl; 5778 DeclContext *Parent = CurContext->getRedeclContext(); 5779 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5780 PrevDecl = TU->getAnonymousNamespace(); 5781 TU->setAnonymousNamespace(Namespc); 5782 } else { 5783 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5784 PrevDecl = ND->getAnonymousNamespace(); 5785 ND->setAnonymousNamespace(Namespc); 5786 } 5787 5788 // Link the anonymous namespace with its previous declaration. 5789 if (PrevDecl) { 5790 assert(PrevDecl->isAnonymousNamespace()); 5791 assert(!PrevDecl->getNextNamespace()); 5792 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 5793 PrevDecl->setNextNamespace(Namespc); 5794 5795 if (Namespc->isInline() != PrevDecl->isInline()) { 5796 // inline-ness must match 5797 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 5798 << Namespc->isInline(); 5799 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5800 Namespc->setInvalidDecl(); 5801 // Recover by ignoring the new namespace's inline status. 5802 Namespc->setInline(PrevDecl->isInline()); 5803 } 5804 } 5805 5806 CurContext->addDecl(Namespc); 5807 5808 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5809 // behaves as if it were replaced by 5810 // namespace unique { /* empty body */ } 5811 // using namespace unique; 5812 // namespace unique { namespace-body } 5813 // where all occurrences of 'unique' in a translation unit are 5814 // replaced by the same identifier and this identifier differs 5815 // from all other identifiers in the entire program. 5816 5817 // We just create the namespace with an empty name and then add an 5818 // implicit using declaration, just like the standard suggests. 5819 // 5820 // CodeGen enforces the "universally unique" aspect by giving all 5821 // declarations semantically contained within an anonymous 5822 // namespace internal linkage. 5823 5824 if (!PrevDecl) { 5825 UsingDirectiveDecl* UD 5826 = UsingDirectiveDecl::Create(Context, CurContext, 5827 /* 'using' */ LBrace, 5828 /* 'namespace' */ SourceLocation(), 5829 /* qualifier */ NestedNameSpecifierLoc(), 5830 /* identifier */ SourceLocation(), 5831 Namespc, 5832 /* Ancestor */ CurContext); 5833 UD->setImplicit(); 5834 CurContext->addDecl(UD); 5835 } 5836 } 5837 5838 // Although we could have an invalid decl (i.e. the namespace name is a 5839 // redefinition), push it as current DeclContext and try to continue parsing. 5840 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5841 // for the namespace has the declarations that showed up in that particular 5842 // namespace definition. 5843 PushDeclContext(NamespcScope, Namespc); 5844 return Namespc; 5845} 5846 5847/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5848/// is a namespace alias, returns the namespace it points to. 5849static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5850 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5851 return AD->getNamespace(); 5852 return dyn_cast_or_null<NamespaceDecl>(D); 5853} 5854 5855/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5856/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5857void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5858 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5859 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5860 Namespc->setRBraceLoc(RBrace); 5861 PopDeclContext(); 5862 if (Namespc->hasAttr<VisibilityAttr>()) 5863 PopPragmaVisibility(); 5864} 5865 5866CXXRecordDecl *Sema::getStdBadAlloc() const { 5867 return cast_or_null<CXXRecordDecl>( 5868 StdBadAlloc.get(Context.getExternalSource())); 5869} 5870 5871NamespaceDecl *Sema::getStdNamespace() const { 5872 return cast_or_null<NamespaceDecl>( 5873 StdNamespace.get(Context.getExternalSource())); 5874} 5875 5876/// \brief Retrieve the special "std" namespace, which may require us to 5877/// implicitly define the namespace. 5878NamespaceDecl *Sema::getOrCreateStdNamespace() { 5879 if (!StdNamespace) { 5880 // The "std" namespace has not yet been defined, so build one implicitly. 5881 StdNamespace = NamespaceDecl::Create(Context, 5882 Context.getTranslationUnitDecl(), 5883 SourceLocation(), SourceLocation(), 5884 &PP.getIdentifierTable().get("std")); 5885 getStdNamespace()->setImplicit(true); 5886 } 5887 5888 return getStdNamespace(); 5889} 5890 5891/// \brief Determine whether a using statement is in a context where it will be 5892/// apply in all contexts. 5893static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5894 switch (CurContext->getDeclKind()) { 5895 case Decl::TranslationUnit: 5896 return true; 5897 case Decl::LinkageSpec: 5898 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5899 default: 5900 return false; 5901 } 5902} 5903 5904static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5905 CXXScopeSpec &SS, 5906 SourceLocation IdentLoc, 5907 IdentifierInfo *Ident) { 5908 R.clear(); 5909 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5910 R.getLookupKind(), Sc, &SS, NULL, 5911 false, S.CTC_NoKeywords, NULL)) { 5912 if (Corrected.getCorrectionDeclAs<NamespaceDecl>() || 5913 Corrected.getCorrectionDeclAs<NamespaceAliasDecl>()) { 5914 std::string CorrectedStr(Corrected.getAsString(S.getLangOptions())); 5915 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOptions())); 5916 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5917 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5918 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5919 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5920 else 5921 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5922 << Ident << CorrectedQuotedStr 5923 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5924 5925 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5926 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5927 5928 Ident = Corrected.getCorrectionAsIdentifierInfo(); 5929 R.addDecl(Corrected.getCorrectionDecl()); 5930 return true; 5931 } 5932 R.setLookupName(Ident); 5933 } 5934 return false; 5935} 5936 5937Decl *Sema::ActOnUsingDirective(Scope *S, 5938 SourceLocation UsingLoc, 5939 SourceLocation NamespcLoc, 5940 CXXScopeSpec &SS, 5941 SourceLocation IdentLoc, 5942 IdentifierInfo *NamespcName, 5943 AttributeList *AttrList) { 5944 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5945 assert(NamespcName && "Invalid NamespcName."); 5946 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5947 5948 // This can only happen along a recovery path. 5949 while (S->getFlags() & Scope::TemplateParamScope) 5950 S = S->getParent(); 5951 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5952 5953 UsingDirectiveDecl *UDir = 0; 5954 NestedNameSpecifier *Qualifier = 0; 5955 if (SS.isSet()) 5956 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5957 5958 // Lookup namespace name. 5959 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5960 LookupParsedName(R, S, &SS); 5961 if (R.isAmbiguous()) 5962 return 0; 5963 5964 if (R.empty()) { 5965 R.clear(); 5966 // Allow "using namespace std;" or "using namespace ::std;" even if 5967 // "std" hasn't been defined yet, for GCC compatibility. 5968 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5969 NamespcName->isStr("std")) { 5970 Diag(IdentLoc, diag::ext_using_undefined_std); 5971 R.addDecl(getOrCreateStdNamespace()); 5972 R.resolveKind(); 5973 } 5974 // Otherwise, attempt typo correction. 5975 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5976 } 5977 5978 if (!R.empty()) { 5979 NamedDecl *Named = R.getFoundDecl(); 5980 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5981 && "expected namespace decl"); 5982 // C++ [namespace.udir]p1: 5983 // A using-directive specifies that the names in the nominated 5984 // namespace can be used in the scope in which the 5985 // using-directive appears after the using-directive. During 5986 // unqualified name lookup (3.4.1), the names appear as if they 5987 // were declared in the nearest enclosing namespace which 5988 // contains both the using-directive and the nominated 5989 // namespace. [Note: in this context, "contains" means "contains 5990 // directly or indirectly". ] 5991 5992 // Find enclosing context containing both using-directive and 5993 // nominated namespace. 5994 NamespaceDecl *NS = getNamespaceDecl(Named); 5995 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5996 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5997 CommonAncestor = CommonAncestor->getParent(); 5998 5999 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 6000 SS.getWithLocInContext(Context), 6001 IdentLoc, Named, CommonAncestor); 6002 6003 if (IsUsingDirectiveInToplevelContext(CurContext) && 6004 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 6005 Diag(IdentLoc, diag::warn_using_directive_in_header); 6006 } 6007 6008 PushUsingDirective(S, UDir); 6009 } else { 6010 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6011 } 6012 6013 // FIXME: We ignore attributes for now. 6014 return UDir; 6015} 6016 6017void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 6018 // If scope has associated entity, then using directive is at namespace 6019 // or translation unit scope. We add UsingDirectiveDecls, into 6020 // it's lookup structure. 6021 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 6022 Ctx->addDecl(UDir); 6023 else 6024 // Otherwise it is block-sope. using-directives will affect lookup 6025 // only to the end of scope. 6026 S->PushUsingDirective(UDir); 6027} 6028 6029 6030Decl *Sema::ActOnUsingDeclaration(Scope *S, 6031 AccessSpecifier AS, 6032 bool HasUsingKeyword, 6033 SourceLocation UsingLoc, 6034 CXXScopeSpec &SS, 6035 UnqualifiedId &Name, 6036 AttributeList *AttrList, 6037 bool IsTypeName, 6038 SourceLocation TypenameLoc) { 6039 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6040 6041 switch (Name.getKind()) { 6042 case UnqualifiedId::IK_ImplicitSelfParam: 6043 case UnqualifiedId::IK_Identifier: 6044 case UnqualifiedId::IK_OperatorFunctionId: 6045 case UnqualifiedId::IK_LiteralOperatorId: 6046 case UnqualifiedId::IK_ConversionFunctionId: 6047 break; 6048 6049 case UnqualifiedId::IK_ConstructorName: 6050 case UnqualifiedId::IK_ConstructorTemplateId: 6051 // C++0x inherited constructors. 6052 if (getLangOptions().CPlusPlus0x) break; 6053 6054 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 6055 << SS.getRange(); 6056 return 0; 6057 6058 case UnqualifiedId::IK_DestructorName: 6059 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 6060 << SS.getRange(); 6061 return 0; 6062 6063 case UnqualifiedId::IK_TemplateId: 6064 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 6065 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 6066 return 0; 6067 } 6068 6069 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 6070 DeclarationName TargetName = TargetNameInfo.getName(); 6071 if (!TargetName) 6072 return 0; 6073 6074 // Warn about using declarations. 6075 // TODO: store that the declaration was written without 'using' and 6076 // talk about access decls instead of using decls in the 6077 // diagnostics. 6078 if (!HasUsingKeyword) { 6079 UsingLoc = Name.getSourceRange().getBegin(); 6080 6081 Diag(UsingLoc, diag::warn_access_decl_deprecated) 6082 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 6083 } 6084 6085 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 6086 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 6087 return 0; 6088 6089 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 6090 TargetNameInfo, AttrList, 6091 /* IsInstantiation */ false, 6092 IsTypeName, TypenameLoc); 6093 if (UD) 6094 PushOnScopeChains(UD, S, /*AddToContext*/ false); 6095 6096 return UD; 6097} 6098 6099/// \brief Determine whether a using declaration considers the given 6100/// declarations as "equivalent", e.g., if they are redeclarations of 6101/// the same entity or are both typedefs of the same type. 6102static bool 6103IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 6104 bool &SuppressRedeclaration) { 6105 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 6106 SuppressRedeclaration = false; 6107 return true; 6108 } 6109 6110 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 6111 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 6112 SuppressRedeclaration = true; 6113 return Context.hasSameType(TD1->getUnderlyingType(), 6114 TD2->getUnderlyingType()); 6115 } 6116 6117 return false; 6118} 6119 6120 6121/// Determines whether to create a using shadow decl for a particular 6122/// decl, given the set of decls existing prior to this using lookup. 6123bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 6124 const LookupResult &Previous) { 6125 // Diagnose finding a decl which is not from a base class of the 6126 // current class. We do this now because there are cases where this 6127 // function will silently decide not to build a shadow decl, which 6128 // will pre-empt further diagnostics. 6129 // 6130 // We don't need to do this in C++0x because we do the check once on 6131 // the qualifier. 6132 // 6133 // FIXME: diagnose the following if we care enough: 6134 // struct A { int foo; }; 6135 // struct B : A { using A::foo; }; 6136 // template <class T> struct C : A {}; 6137 // template <class T> struct D : C<T> { using B::foo; } // <--- 6138 // This is invalid (during instantiation) in C++03 because B::foo 6139 // resolves to the using decl in B, which is not a base class of D<T>. 6140 // We can't diagnose it immediately because C<T> is an unknown 6141 // specialization. The UsingShadowDecl in D<T> then points directly 6142 // to A::foo, which will look well-formed when we instantiate. 6143 // The right solution is to not collapse the shadow-decl chain. 6144 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 6145 DeclContext *OrigDC = Orig->getDeclContext(); 6146 6147 // Handle enums and anonymous structs. 6148 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 6149 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 6150 while (OrigRec->isAnonymousStructOrUnion()) 6151 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 6152 6153 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 6154 if (OrigDC == CurContext) { 6155 Diag(Using->getLocation(), 6156 diag::err_using_decl_nested_name_specifier_is_current_class) 6157 << Using->getQualifierLoc().getSourceRange(); 6158 Diag(Orig->getLocation(), diag::note_using_decl_target); 6159 return true; 6160 } 6161 6162 Diag(Using->getQualifierLoc().getBeginLoc(), 6163 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6164 << Using->getQualifier() 6165 << cast<CXXRecordDecl>(CurContext) 6166 << Using->getQualifierLoc().getSourceRange(); 6167 Diag(Orig->getLocation(), diag::note_using_decl_target); 6168 return true; 6169 } 6170 } 6171 6172 if (Previous.empty()) return false; 6173 6174 NamedDecl *Target = Orig; 6175 if (isa<UsingShadowDecl>(Target)) 6176 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6177 6178 // If the target happens to be one of the previous declarations, we 6179 // don't have a conflict. 6180 // 6181 // FIXME: but we might be increasing its access, in which case we 6182 // should redeclare it. 6183 NamedDecl *NonTag = 0, *Tag = 0; 6184 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 6185 I != E; ++I) { 6186 NamedDecl *D = (*I)->getUnderlyingDecl(); 6187 bool Result; 6188 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 6189 return Result; 6190 6191 (isa<TagDecl>(D) ? Tag : NonTag) = D; 6192 } 6193 6194 if (Target->isFunctionOrFunctionTemplate()) { 6195 FunctionDecl *FD; 6196 if (isa<FunctionTemplateDecl>(Target)) 6197 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6198 else 6199 FD = cast<FunctionDecl>(Target); 6200 6201 NamedDecl *OldDecl = 0; 6202 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6203 case Ovl_Overload: 6204 return false; 6205 6206 case Ovl_NonFunction: 6207 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6208 break; 6209 6210 // We found a decl with the exact signature. 6211 case Ovl_Match: 6212 // If we're in a record, we want to hide the target, so we 6213 // return true (without a diagnostic) to tell the caller not to 6214 // build a shadow decl. 6215 if (CurContext->isRecord()) 6216 return true; 6217 6218 // If we're not in a record, this is an error. 6219 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6220 break; 6221 } 6222 6223 Diag(Target->getLocation(), diag::note_using_decl_target); 6224 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6225 return true; 6226 } 6227 6228 // Target is not a function. 6229 6230 if (isa<TagDecl>(Target)) { 6231 // No conflict between a tag and a non-tag. 6232 if (!Tag) return false; 6233 6234 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6235 Diag(Target->getLocation(), diag::note_using_decl_target); 6236 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6237 return true; 6238 } 6239 6240 // No conflict between a tag and a non-tag. 6241 if (!NonTag) return false; 6242 6243 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6244 Diag(Target->getLocation(), diag::note_using_decl_target); 6245 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6246 return true; 6247} 6248 6249/// Builds a shadow declaration corresponding to a 'using' declaration. 6250UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6251 UsingDecl *UD, 6252 NamedDecl *Orig) { 6253 6254 // If we resolved to another shadow declaration, just coalesce them. 6255 NamedDecl *Target = Orig; 6256 if (isa<UsingShadowDecl>(Target)) { 6257 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6258 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6259 } 6260 6261 UsingShadowDecl *Shadow 6262 = UsingShadowDecl::Create(Context, CurContext, 6263 UD->getLocation(), UD, Target); 6264 UD->addShadowDecl(Shadow); 6265 6266 Shadow->setAccess(UD->getAccess()); 6267 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6268 Shadow->setInvalidDecl(); 6269 6270 if (S) 6271 PushOnScopeChains(Shadow, S); 6272 else 6273 CurContext->addDecl(Shadow); 6274 6275 6276 return Shadow; 6277} 6278 6279/// Hides a using shadow declaration. This is required by the current 6280/// using-decl implementation when a resolvable using declaration in a 6281/// class is followed by a declaration which would hide or override 6282/// one or more of the using decl's targets; for example: 6283/// 6284/// struct Base { void foo(int); }; 6285/// struct Derived : Base { 6286/// using Base::foo; 6287/// void foo(int); 6288/// }; 6289/// 6290/// The governing language is C++03 [namespace.udecl]p12: 6291/// 6292/// When a using-declaration brings names from a base class into a 6293/// derived class scope, member functions in the derived class 6294/// override and/or hide member functions with the same name and 6295/// parameter types in a base class (rather than conflicting). 6296/// 6297/// There are two ways to implement this: 6298/// (1) optimistically create shadow decls when they're not hidden 6299/// by existing declarations, or 6300/// (2) don't create any shadow decls (or at least don't make them 6301/// visible) until we've fully parsed/instantiated the class. 6302/// The problem with (1) is that we might have to retroactively remove 6303/// a shadow decl, which requires several O(n) operations because the 6304/// decl structures are (very reasonably) not designed for removal. 6305/// (2) avoids this but is very fiddly and phase-dependent. 6306void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6307 if (Shadow->getDeclName().getNameKind() == 6308 DeclarationName::CXXConversionFunctionName) 6309 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6310 6311 // Remove it from the DeclContext... 6312 Shadow->getDeclContext()->removeDecl(Shadow); 6313 6314 // ...and the scope, if applicable... 6315 if (S) { 6316 S->RemoveDecl(Shadow); 6317 IdResolver.RemoveDecl(Shadow); 6318 } 6319 6320 // ...and the using decl. 6321 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6322 6323 // TODO: complain somehow if Shadow was used. It shouldn't 6324 // be possible for this to happen, because...? 6325} 6326 6327/// Builds a using declaration. 6328/// 6329/// \param IsInstantiation - Whether this call arises from an 6330/// instantiation of an unresolved using declaration. We treat 6331/// the lookup differently for these declarations. 6332NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6333 SourceLocation UsingLoc, 6334 CXXScopeSpec &SS, 6335 const DeclarationNameInfo &NameInfo, 6336 AttributeList *AttrList, 6337 bool IsInstantiation, 6338 bool IsTypeName, 6339 SourceLocation TypenameLoc) { 6340 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6341 SourceLocation IdentLoc = NameInfo.getLoc(); 6342 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6343 6344 // FIXME: We ignore attributes for now. 6345 6346 if (SS.isEmpty()) { 6347 Diag(IdentLoc, diag::err_using_requires_qualname); 6348 return 0; 6349 } 6350 6351 // Do the redeclaration lookup in the current scope. 6352 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6353 ForRedeclaration); 6354 Previous.setHideTags(false); 6355 if (S) { 6356 LookupName(Previous, S); 6357 6358 // It is really dumb that we have to do this. 6359 LookupResult::Filter F = Previous.makeFilter(); 6360 while (F.hasNext()) { 6361 NamedDecl *D = F.next(); 6362 if (!isDeclInScope(D, CurContext, S)) 6363 F.erase(); 6364 } 6365 F.done(); 6366 } else { 6367 assert(IsInstantiation && "no scope in non-instantiation"); 6368 assert(CurContext->isRecord() && "scope not record in instantiation"); 6369 LookupQualifiedName(Previous, CurContext); 6370 } 6371 6372 // Check for invalid redeclarations. 6373 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6374 return 0; 6375 6376 // Check for bad qualifiers. 6377 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6378 return 0; 6379 6380 DeclContext *LookupContext = computeDeclContext(SS); 6381 NamedDecl *D; 6382 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6383 if (!LookupContext) { 6384 if (IsTypeName) { 6385 // FIXME: not all declaration name kinds are legal here 6386 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6387 UsingLoc, TypenameLoc, 6388 QualifierLoc, 6389 IdentLoc, NameInfo.getName()); 6390 } else { 6391 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6392 QualifierLoc, NameInfo); 6393 } 6394 } else { 6395 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6396 NameInfo, IsTypeName); 6397 } 6398 D->setAccess(AS); 6399 CurContext->addDecl(D); 6400 6401 if (!LookupContext) return D; 6402 UsingDecl *UD = cast<UsingDecl>(D); 6403 6404 if (RequireCompleteDeclContext(SS, LookupContext)) { 6405 UD->setInvalidDecl(); 6406 return UD; 6407 } 6408 6409 // Constructor inheriting using decls get special treatment. 6410 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6411 if (CheckInheritedConstructorUsingDecl(UD)) 6412 UD->setInvalidDecl(); 6413 return UD; 6414 } 6415 6416 // Otherwise, look up the target name. 6417 6418 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6419 6420 // Unlike most lookups, we don't always want to hide tag 6421 // declarations: tag names are visible through the using declaration 6422 // even if hidden by ordinary names, *except* in a dependent context 6423 // where it's important for the sanity of two-phase lookup. 6424 if (!IsInstantiation) 6425 R.setHideTags(false); 6426 6427 LookupQualifiedName(R, LookupContext); 6428 6429 if (R.empty()) { 6430 Diag(IdentLoc, diag::err_no_member) 6431 << NameInfo.getName() << LookupContext << SS.getRange(); 6432 UD->setInvalidDecl(); 6433 return UD; 6434 } 6435 6436 if (R.isAmbiguous()) { 6437 UD->setInvalidDecl(); 6438 return UD; 6439 } 6440 6441 if (IsTypeName) { 6442 // If we asked for a typename and got a non-type decl, error out. 6443 if (!R.getAsSingle<TypeDecl>()) { 6444 Diag(IdentLoc, diag::err_using_typename_non_type); 6445 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6446 Diag((*I)->getUnderlyingDecl()->getLocation(), 6447 diag::note_using_decl_target); 6448 UD->setInvalidDecl(); 6449 return UD; 6450 } 6451 } else { 6452 // If we asked for a non-typename and we got a type, error out, 6453 // but only if this is an instantiation of an unresolved using 6454 // decl. Otherwise just silently find the type name. 6455 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6456 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6457 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6458 UD->setInvalidDecl(); 6459 return UD; 6460 } 6461 } 6462 6463 // C++0x N2914 [namespace.udecl]p6: 6464 // A using-declaration shall not name a namespace. 6465 if (R.getAsSingle<NamespaceDecl>()) { 6466 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6467 << SS.getRange(); 6468 UD->setInvalidDecl(); 6469 return UD; 6470 } 6471 6472 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6473 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6474 BuildUsingShadowDecl(S, UD, *I); 6475 } 6476 6477 return UD; 6478} 6479 6480/// Additional checks for a using declaration referring to a constructor name. 6481bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 6482 if (UD->isTypeName()) { 6483 // FIXME: Cannot specify typename when specifying constructor 6484 return true; 6485 } 6486 6487 const Type *SourceType = UD->getQualifier()->getAsType(); 6488 assert(SourceType && 6489 "Using decl naming constructor doesn't have type in scope spec."); 6490 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6491 6492 // Check whether the named type is a direct base class. 6493 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6494 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6495 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6496 BaseIt != BaseE; ++BaseIt) { 6497 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6498 if (CanonicalSourceType == BaseType) 6499 break; 6500 } 6501 6502 if (BaseIt == BaseE) { 6503 // Did not find SourceType in the bases. 6504 Diag(UD->getUsingLocation(), 6505 diag::err_using_decl_constructor_not_in_direct_base) 6506 << UD->getNameInfo().getSourceRange() 6507 << QualType(SourceType, 0) << TargetClass; 6508 return true; 6509 } 6510 6511 BaseIt->setInheritConstructors(); 6512 6513 return false; 6514} 6515 6516/// Checks that the given using declaration is not an invalid 6517/// redeclaration. Note that this is checking only for the using decl 6518/// itself, not for any ill-formedness among the UsingShadowDecls. 6519bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6520 bool isTypeName, 6521 const CXXScopeSpec &SS, 6522 SourceLocation NameLoc, 6523 const LookupResult &Prev) { 6524 // C++03 [namespace.udecl]p8: 6525 // C++0x [namespace.udecl]p10: 6526 // A using-declaration is a declaration and can therefore be used 6527 // repeatedly where (and only where) multiple declarations are 6528 // allowed. 6529 // 6530 // That's in non-member contexts. 6531 if (!CurContext->getRedeclContext()->isRecord()) 6532 return false; 6533 6534 NestedNameSpecifier *Qual 6535 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6536 6537 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6538 NamedDecl *D = *I; 6539 6540 bool DTypename; 6541 NestedNameSpecifier *DQual; 6542 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6543 DTypename = UD->isTypeName(); 6544 DQual = UD->getQualifier(); 6545 } else if (UnresolvedUsingValueDecl *UD 6546 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6547 DTypename = false; 6548 DQual = UD->getQualifier(); 6549 } else if (UnresolvedUsingTypenameDecl *UD 6550 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6551 DTypename = true; 6552 DQual = UD->getQualifier(); 6553 } else continue; 6554 6555 // using decls differ if one says 'typename' and the other doesn't. 6556 // FIXME: non-dependent using decls? 6557 if (isTypeName != DTypename) continue; 6558 6559 // using decls differ if they name different scopes (but note that 6560 // template instantiation can cause this check to trigger when it 6561 // didn't before instantiation). 6562 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6563 Context.getCanonicalNestedNameSpecifier(DQual)) 6564 continue; 6565 6566 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6567 Diag(D->getLocation(), diag::note_using_decl) << 1; 6568 return true; 6569 } 6570 6571 return false; 6572} 6573 6574 6575/// Checks that the given nested-name qualifier used in a using decl 6576/// in the current context is appropriately related to the current 6577/// scope. If an error is found, diagnoses it and returns true. 6578bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6579 const CXXScopeSpec &SS, 6580 SourceLocation NameLoc) { 6581 DeclContext *NamedContext = computeDeclContext(SS); 6582 6583 if (!CurContext->isRecord()) { 6584 // C++03 [namespace.udecl]p3: 6585 // C++0x [namespace.udecl]p8: 6586 // A using-declaration for a class member shall be a member-declaration. 6587 6588 // If we weren't able to compute a valid scope, it must be a 6589 // dependent class scope. 6590 if (!NamedContext || NamedContext->isRecord()) { 6591 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6592 << SS.getRange(); 6593 return true; 6594 } 6595 6596 // Otherwise, everything is known to be fine. 6597 return false; 6598 } 6599 6600 // The current scope is a record. 6601 6602 // If the named context is dependent, we can't decide much. 6603 if (!NamedContext) { 6604 // FIXME: in C++0x, we can diagnose if we can prove that the 6605 // nested-name-specifier does not refer to a base class, which is 6606 // still possible in some cases. 6607 6608 // Otherwise we have to conservatively report that things might be 6609 // okay. 6610 return false; 6611 } 6612 6613 if (!NamedContext->isRecord()) { 6614 // Ideally this would point at the last name in the specifier, 6615 // but we don't have that level of source info. 6616 Diag(SS.getRange().getBegin(), 6617 diag::err_using_decl_nested_name_specifier_is_not_class) 6618 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6619 return true; 6620 } 6621 6622 if (!NamedContext->isDependentContext() && 6623 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6624 return true; 6625 6626 if (getLangOptions().CPlusPlus0x) { 6627 // C++0x [namespace.udecl]p3: 6628 // In a using-declaration used as a member-declaration, the 6629 // nested-name-specifier shall name a base class of the class 6630 // being defined. 6631 6632 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6633 cast<CXXRecordDecl>(NamedContext))) { 6634 if (CurContext == NamedContext) { 6635 Diag(NameLoc, 6636 diag::err_using_decl_nested_name_specifier_is_current_class) 6637 << SS.getRange(); 6638 return true; 6639 } 6640 6641 Diag(SS.getRange().getBegin(), 6642 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6643 << (NestedNameSpecifier*) SS.getScopeRep() 6644 << cast<CXXRecordDecl>(CurContext) 6645 << SS.getRange(); 6646 return true; 6647 } 6648 6649 return false; 6650 } 6651 6652 // C++03 [namespace.udecl]p4: 6653 // A using-declaration used as a member-declaration shall refer 6654 // to a member of a base class of the class being defined [etc.]. 6655 6656 // Salient point: SS doesn't have to name a base class as long as 6657 // lookup only finds members from base classes. Therefore we can 6658 // diagnose here only if we can prove that that can't happen, 6659 // i.e. if the class hierarchies provably don't intersect. 6660 6661 // TODO: it would be nice if "definitely valid" results were cached 6662 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6663 // need to be repeated. 6664 6665 struct UserData { 6666 llvm::DenseSet<const CXXRecordDecl*> Bases; 6667 6668 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6669 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6670 Data->Bases.insert(Base); 6671 return true; 6672 } 6673 6674 bool hasDependentBases(const CXXRecordDecl *Class) { 6675 return !Class->forallBases(collect, this); 6676 } 6677 6678 /// Returns true if the base is dependent or is one of the 6679 /// accumulated base classes. 6680 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6681 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6682 return !Data->Bases.count(Base); 6683 } 6684 6685 bool mightShareBases(const CXXRecordDecl *Class) { 6686 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6687 } 6688 }; 6689 6690 UserData Data; 6691 6692 // Returns false if we find a dependent base. 6693 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6694 return false; 6695 6696 // Returns false if the class has a dependent base or if it or one 6697 // of its bases is present in the base set of the current context. 6698 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6699 return false; 6700 6701 Diag(SS.getRange().getBegin(), 6702 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6703 << (NestedNameSpecifier*) SS.getScopeRep() 6704 << cast<CXXRecordDecl>(CurContext) 6705 << SS.getRange(); 6706 6707 return true; 6708} 6709 6710Decl *Sema::ActOnAliasDeclaration(Scope *S, 6711 AccessSpecifier AS, 6712 MultiTemplateParamsArg TemplateParamLists, 6713 SourceLocation UsingLoc, 6714 UnqualifiedId &Name, 6715 TypeResult Type) { 6716 // Skip up to the relevant declaration scope. 6717 while (S->getFlags() & Scope::TemplateParamScope) 6718 S = S->getParent(); 6719 assert((S->getFlags() & Scope::DeclScope) && 6720 "got alias-declaration outside of declaration scope"); 6721 6722 if (Type.isInvalid()) 6723 return 0; 6724 6725 bool Invalid = false; 6726 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6727 TypeSourceInfo *TInfo = 0; 6728 GetTypeFromParser(Type.get(), &TInfo); 6729 6730 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6731 return 0; 6732 6733 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6734 UPPC_DeclarationType)) { 6735 Invalid = true; 6736 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6737 TInfo->getTypeLoc().getBeginLoc()); 6738 } 6739 6740 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6741 LookupName(Previous, S); 6742 6743 // Warn about shadowing the name of a template parameter. 6744 if (Previous.isSingleResult() && 6745 Previous.getFoundDecl()->isTemplateParameter()) { 6746 if (DiagnoseTemplateParameterShadow(Name.StartLocation, 6747 Previous.getFoundDecl())) 6748 Invalid = true; 6749 Previous.clear(); 6750 } 6751 6752 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6753 "name in alias declaration must be an identifier"); 6754 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6755 Name.StartLocation, 6756 Name.Identifier, TInfo); 6757 6758 NewTD->setAccess(AS); 6759 6760 if (Invalid) 6761 NewTD->setInvalidDecl(); 6762 6763 CheckTypedefForVariablyModifiedType(S, NewTD); 6764 Invalid |= NewTD->isInvalidDecl(); 6765 6766 bool Redeclaration = false; 6767 6768 NamedDecl *NewND; 6769 if (TemplateParamLists.size()) { 6770 TypeAliasTemplateDecl *OldDecl = 0; 6771 TemplateParameterList *OldTemplateParams = 0; 6772 6773 if (TemplateParamLists.size() != 1) { 6774 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6775 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6776 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6777 } 6778 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6779 6780 // Only consider previous declarations in the same scope. 6781 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6782 /*ExplicitInstantiationOrSpecialization*/false); 6783 if (!Previous.empty()) { 6784 Redeclaration = true; 6785 6786 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6787 if (!OldDecl && !Invalid) { 6788 Diag(UsingLoc, diag::err_redefinition_different_kind) 6789 << Name.Identifier; 6790 6791 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6792 if (OldD->getLocation().isValid()) 6793 Diag(OldD->getLocation(), diag::note_previous_definition); 6794 6795 Invalid = true; 6796 } 6797 6798 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6799 if (TemplateParameterListsAreEqual(TemplateParams, 6800 OldDecl->getTemplateParameters(), 6801 /*Complain=*/true, 6802 TPL_TemplateMatch)) 6803 OldTemplateParams = OldDecl->getTemplateParameters(); 6804 else 6805 Invalid = true; 6806 6807 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6808 if (!Invalid && 6809 !Context.hasSameType(OldTD->getUnderlyingType(), 6810 NewTD->getUnderlyingType())) { 6811 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6812 // but we can't reasonably accept it. 6813 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6814 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6815 if (OldTD->getLocation().isValid()) 6816 Diag(OldTD->getLocation(), diag::note_previous_definition); 6817 Invalid = true; 6818 } 6819 } 6820 } 6821 6822 // Merge any previous default template arguments into our parameters, 6823 // and check the parameter list. 6824 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6825 TPC_TypeAliasTemplate)) 6826 return 0; 6827 6828 TypeAliasTemplateDecl *NewDecl = 6829 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6830 Name.Identifier, TemplateParams, 6831 NewTD); 6832 6833 NewDecl->setAccess(AS); 6834 6835 if (Invalid) 6836 NewDecl->setInvalidDecl(); 6837 else if (OldDecl) 6838 NewDecl->setPreviousDeclaration(OldDecl); 6839 6840 NewND = NewDecl; 6841 } else { 6842 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6843 NewND = NewTD; 6844 } 6845 6846 if (!Redeclaration) 6847 PushOnScopeChains(NewND, S); 6848 6849 return NewND; 6850} 6851 6852Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6853 SourceLocation NamespaceLoc, 6854 SourceLocation AliasLoc, 6855 IdentifierInfo *Alias, 6856 CXXScopeSpec &SS, 6857 SourceLocation IdentLoc, 6858 IdentifierInfo *Ident) { 6859 6860 // Lookup the namespace name. 6861 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6862 LookupParsedName(R, S, &SS); 6863 6864 // Check if we have a previous declaration with the same name. 6865 NamedDecl *PrevDecl 6866 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6867 ForRedeclaration); 6868 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6869 PrevDecl = 0; 6870 6871 if (PrevDecl) { 6872 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6873 // We already have an alias with the same name that points to the same 6874 // namespace, so don't create a new one. 6875 // FIXME: At some point, we'll want to create the (redundant) 6876 // declaration to maintain better source information. 6877 if (!R.isAmbiguous() && !R.empty() && 6878 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6879 return 0; 6880 } 6881 6882 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6883 diag::err_redefinition_different_kind; 6884 Diag(AliasLoc, DiagID) << Alias; 6885 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6886 return 0; 6887 } 6888 6889 if (R.isAmbiguous()) 6890 return 0; 6891 6892 if (R.empty()) { 6893 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6894 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 6895 return 0; 6896 } 6897 } 6898 6899 NamespaceAliasDecl *AliasDecl = 6900 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6901 Alias, SS.getWithLocInContext(Context), 6902 IdentLoc, R.getFoundDecl()); 6903 6904 PushOnScopeChains(AliasDecl, S); 6905 return AliasDecl; 6906} 6907 6908namespace { 6909 /// \brief Scoped object used to handle the state changes required in Sema 6910 /// to implicitly define the body of a C++ member function; 6911 class ImplicitlyDefinedFunctionScope { 6912 Sema &S; 6913 Sema::ContextRAII SavedContext; 6914 6915 public: 6916 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6917 : S(S), SavedContext(S, Method) 6918 { 6919 S.PushFunctionScope(); 6920 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6921 } 6922 6923 ~ImplicitlyDefinedFunctionScope() { 6924 S.PopExpressionEvaluationContext(); 6925 S.PopFunctionOrBlockScope(); 6926 } 6927 }; 6928} 6929 6930Sema::ImplicitExceptionSpecification 6931Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6932 // C++ [except.spec]p14: 6933 // An implicitly declared special member function (Clause 12) shall have an 6934 // exception-specification. [...] 6935 ImplicitExceptionSpecification ExceptSpec(Context); 6936 if (ClassDecl->isInvalidDecl()) 6937 return ExceptSpec; 6938 6939 // Direct base-class constructors. 6940 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6941 BEnd = ClassDecl->bases_end(); 6942 B != BEnd; ++B) { 6943 if (B->isVirtual()) // Handled below. 6944 continue; 6945 6946 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6947 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6948 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6949 // If this is a deleted function, add it anyway. This might be conformant 6950 // with the standard. This might not. I'm not sure. It might not matter. 6951 if (Constructor) 6952 ExceptSpec.CalledDecl(Constructor); 6953 } 6954 } 6955 6956 // Virtual base-class constructors. 6957 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6958 BEnd = ClassDecl->vbases_end(); 6959 B != BEnd; ++B) { 6960 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6961 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6962 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6963 // If this is a deleted function, add it anyway. This might be conformant 6964 // with the standard. This might not. I'm not sure. It might not matter. 6965 if (Constructor) 6966 ExceptSpec.CalledDecl(Constructor); 6967 } 6968 } 6969 6970 // Field constructors. 6971 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6972 FEnd = ClassDecl->field_end(); 6973 F != FEnd; ++F) { 6974 if (F->hasInClassInitializer()) { 6975 if (Expr *E = F->getInClassInitializer()) 6976 ExceptSpec.CalledExpr(E); 6977 else if (!F->isInvalidDecl()) 6978 ExceptSpec.SetDelayed(); 6979 } else if (const RecordType *RecordTy 6980 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6981 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6982 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6983 // If this is a deleted function, add it anyway. This might be conformant 6984 // with the standard. This might not. I'm not sure. It might not matter. 6985 // In particular, the problem is that this function never gets called. It 6986 // might just be ill-formed because this function attempts to refer to 6987 // a deleted function here. 6988 if (Constructor) 6989 ExceptSpec.CalledDecl(Constructor); 6990 } 6991 } 6992 6993 return ExceptSpec; 6994} 6995 6996CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6997 CXXRecordDecl *ClassDecl) { 6998 // C++ [class.ctor]p5: 6999 // A default constructor for a class X is a constructor of class X 7000 // that can be called without an argument. If there is no 7001 // user-declared constructor for class X, a default constructor is 7002 // implicitly declared. An implicitly-declared default constructor 7003 // is an inline public member of its class. 7004 assert(!ClassDecl->hasUserDeclaredConstructor() && 7005 "Should not build implicit default constructor!"); 7006 7007 ImplicitExceptionSpecification Spec = 7008 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 7009 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7010 7011 // Create the actual constructor declaration. 7012 CanQualType ClassType 7013 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7014 SourceLocation ClassLoc = ClassDecl->getLocation(); 7015 DeclarationName Name 7016 = Context.DeclarationNames.getCXXConstructorName(ClassType); 7017 DeclarationNameInfo NameInfo(Name, ClassLoc); 7018 CXXConstructorDecl *DefaultCon 7019 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7020 Context.getFunctionType(Context.VoidTy, 7021 0, 0, EPI), 7022 /*TInfo=*/0, 7023 /*isExplicit=*/false, 7024 /*isInline=*/true, 7025 /*isImplicitlyDeclared=*/true, 7026 // FIXME: apply the rules for definitions here 7027 /*isConstexpr=*/false); 7028 DefaultCon->setAccess(AS_public); 7029 DefaultCon->setDefaulted(); 7030 DefaultCon->setImplicit(); 7031 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 7032 7033 // Note that we have declared this constructor. 7034 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 7035 7036 if (Scope *S = getScopeForContext(ClassDecl)) 7037 PushOnScopeChains(DefaultCon, S, false); 7038 ClassDecl->addDecl(DefaultCon); 7039 7040 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 7041 DefaultCon->setDeletedAsWritten(); 7042 7043 return DefaultCon; 7044} 7045 7046void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 7047 CXXConstructorDecl *Constructor) { 7048 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 7049 !Constructor->doesThisDeclarationHaveABody() && 7050 !Constructor->isDeleted()) && 7051 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 7052 7053 CXXRecordDecl *ClassDecl = Constructor->getParent(); 7054 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 7055 7056 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 7057 DiagnosticErrorTrap Trap(Diags); 7058 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 7059 Trap.hasErrorOccurred()) { 7060 Diag(CurrentLocation, diag::note_member_synthesized_at) 7061 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 7062 Constructor->setInvalidDecl(); 7063 return; 7064 } 7065 7066 SourceLocation Loc = Constructor->getLocation(); 7067 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7068 7069 Constructor->setUsed(); 7070 MarkVTableUsed(CurrentLocation, ClassDecl); 7071 7072 if (ASTMutationListener *L = getASTMutationListener()) { 7073 L->CompletedImplicitDefinition(Constructor); 7074 } 7075} 7076 7077/// Get any existing defaulted default constructor for the given class. Do not 7078/// implicitly define one if it does not exist. 7079static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 7080 CXXRecordDecl *D) { 7081 ASTContext &Context = Self.Context; 7082 QualType ClassType = Context.getTypeDeclType(D); 7083 DeclarationName ConstructorName 7084 = Context.DeclarationNames.getCXXConstructorName( 7085 Context.getCanonicalType(ClassType.getUnqualifiedType())); 7086 7087 DeclContext::lookup_const_iterator Con, ConEnd; 7088 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 7089 Con != ConEnd; ++Con) { 7090 // A function template cannot be defaulted. 7091 if (isa<FunctionTemplateDecl>(*Con)) 7092 continue; 7093 7094 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 7095 if (Constructor->isDefaultConstructor()) 7096 return Constructor->isDefaulted() ? Constructor : 0; 7097 } 7098 return 0; 7099} 7100 7101void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 7102 if (!D) return; 7103 AdjustDeclIfTemplate(D); 7104 7105 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 7106 CXXConstructorDecl *CtorDecl 7107 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 7108 7109 if (!CtorDecl) return; 7110 7111 // Compute the exception specification for the default constructor. 7112 const FunctionProtoType *CtorTy = 7113 CtorDecl->getType()->castAs<FunctionProtoType>(); 7114 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 7115 ImplicitExceptionSpecification Spec = 7116 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 7117 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7118 assert(EPI.ExceptionSpecType != EST_Delayed); 7119 7120 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7121 } 7122 7123 // If the default constructor is explicitly defaulted, checking the exception 7124 // specification is deferred until now. 7125 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 7126 !ClassDecl->isDependentType()) 7127 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 7128} 7129 7130void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 7131 // We start with an initial pass over the base classes to collect those that 7132 // inherit constructors from. If there are none, we can forgo all further 7133 // processing. 7134 typedef SmallVector<const RecordType *, 4> BasesVector; 7135 BasesVector BasesToInheritFrom; 7136 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 7137 BaseE = ClassDecl->bases_end(); 7138 BaseIt != BaseE; ++BaseIt) { 7139 if (BaseIt->getInheritConstructors()) { 7140 QualType Base = BaseIt->getType(); 7141 if (Base->isDependentType()) { 7142 // If we inherit constructors from anything that is dependent, just 7143 // abort processing altogether. We'll get another chance for the 7144 // instantiations. 7145 return; 7146 } 7147 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 7148 } 7149 } 7150 if (BasesToInheritFrom.empty()) 7151 return; 7152 7153 // Now collect the constructors that we already have in the current class. 7154 // Those take precedence over inherited constructors. 7155 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 7156 // unless there is a user-declared constructor with the same signature in 7157 // the class where the using-declaration appears. 7158 llvm::SmallSet<const Type *, 8> ExistingConstructors; 7159 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 7160 CtorE = ClassDecl->ctor_end(); 7161 CtorIt != CtorE; ++CtorIt) { 7162 ExistingConstructors.insert( 7163 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 7164 } 7165 7166 Scope *S = getScopeForContext(ClassDecl); 7167 DeclarationName CreatedCtorName = 7168 Context.DeclarationNames.getCXXConstructorName( 7169 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 7170 7171 // Now comes the true work. 7172 // First, we keep a map from constructor types to the base that introduced 7173 // them. Needed for finding conflicting constructors. We also keep the 7174 // actually inserted declarations in there, for pretty diagnostics. 7175 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 7176 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 7177 ConstructorToSourceMap InheritedConstructors; 7178 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 7179 BaseE = BasesToInheritFrom.end(); 7180 BaseIt != BaseE; ++BaseIt) { 7181 const RecordType *Base = *BaseIt; 7182 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 7183 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 7184 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 7185 CtorE = BaseDecl->ctor_end(); 7186 CtorIt != CtorE; ++CtorIt) { 7187 // Find the using declaration for inheriting this base's constructors. 7188 DeclarationName Name = 7189 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 7190 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 7191 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 7192 SourceLocation UsingLoc = UD ? UD->getLocation() : 7193 ClassDecl->getLocation(); 7194 7195 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 7196 // from the class X named in the using-declaration consists of actual 7197 // constructors and notional constructors that result from the 7198 // transformation of defaulted parameters as follows: 7199 // - all non-template default constructors of X, and 7200 // - for each non-template constructor of X that has at least one 7201 // parameter with a default argument, the set of constructors that 7202 // results from omitting any ellipsis parameter specification and 7203 // successively omitting parameters with a default argument from the 7204 // end of the parameter-type-list. 7205 CXXConstructorDecl *BaseCtor = *CtorIt; 7206 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 7207 const FunctionProtoType *BaseCtorType = 7208 BaseCtor->getType()->getAs<FunctionProtoType>(); 7209 7210 for (unsigned params = BaseCtor->getMinRequiredArguments(), 7211 maxParams = BaseCtor->getNumParams(); 7212 params <= maxParams; ++params) { 7213 // Skip default constructors. They're never inherited. 7214 if (params == 0) 7215 continue; 7216 // Skip copy and move constructors for the same reason. 7217 if (CanBeCopyOrMove && params == 1) 7218 continue; 7219 7220 // Build up a function type for this particular constructor. 7221 // FIXME: The working paper does not consider that the exception spec 7222 // for the inheriting constructor might be larger than that of the 7223 // source. This code doesn't yet, either. When it does, this code will 7224 // need to be delayed until after exception specifications and in-class 7225 // member initializers are attached. 7226 const Type *NewCtorType; 7227 if (params == maxParams) 7228 NewCtorType = BaseCtorType; 7229 else { 7230 SmallVector<QualType, 16> Args; 7231 for (unsigned i = 0; i < params; ++i) { 7232 Args.push_back(BaseCtorType->getArgType(i)); 7233 } 7234 FunctionProtoType::ExtProtoInfo ExtInfo = 7235 BaseCtorType->getExtProtoInfo(); 7236 ExtInfo.Variadic = false; 7237 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7238 Args.data(), params, ExtInfo) 7239 .getTypePtr(); 7240 } 7241 const Type *CanonicalNewCtorType = 7242 Context.getCanonicalType(NewCtorType); 7243 7244 // Now that we have the type, first check if the class already has a 7245 // constructor with this signature. 7246 if (ExistingConstructors.count(CanonicalNewCtorType)) 7247 continue; 7248 7249 // Then we check if we have already declared an inherited constructor 7250 // with this signature. 7251 std::pair<ConstructorToSourceMap::iterator, bool> result = 7252 InheritedConstructors.insert(std::make_pair( 7253 CanonicalNewCtorType, 7254 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7255 if (!result.second) { 7256 // Already in the map. If it came from a different class, that's an 7257 // error. Not if it's from the same. 7258 CanQualType PreviousBase = result.first->second.first; 7259 if (CanonicalBase != PreviousBase) { 7260 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7261 const CXXConstructorDecl *PrevBaseCtor = 7262 PrevCtor->getInheritedConstructor(); 7263 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7264 7265 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7266 Diag(BaseCtor->getLocation(), 7267 diag::note_using_decl_constructor_conflict_current_ctor); 7268 Diag(PrevBaseCtor->getLocation(), 7269 diag::note_using_decl_constructor_conflict_previous_ctor); 7270 Diag(PrevCtor->getLocation(), 7271 diag::note_using_decl_constructor_conflict_previous_using); 7272 } 7273 continue; 7274 } 7275 7276 // OK, we're there, now add the constructor. 7277 // C++0x [class.inhctor]p8: [...] that would be performed by a 7278 // user-written inline constructor [...] 7279 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7280 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7281 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7282 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7283 /*ImplicitlyDeclared=*/true, 7284 // FIXME: Due to a defect in the standard, we treat inherited 7285 // constructors as constexpr even if that makes them ill-formed. 7286 /*Constexpr=*/BaseCtor->isConstexpr()); 7287 NewCtor->setAccess(BaseCtor->getAccess()); 7288 7289 // Build up the parameter decls and add them. 7290 SmallVector<ParmVarDecl *, 16> ParamDecls; 7291 for (unsigned i = 0; i < params; ++i) { 7292 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7293 UsingLoc, UsingLoc, 7294 /*IdentifierInfo=*/0, 7295 BaseCtorType->getArgType(i), 7296 /*TInfo=*/0, SC_None, 7297 SC_None, /*DefaultArg=*/0)); 7298 } 7299 NewCtor->setParams(ParamDecls); 7300 NewCtor->setInheritedConstructor(BaseCtor); 7301 7302 PushOnScopeChains(NewCtor, S, false); 7303 ClassDecl->addDecl(NewCtor); 7304 result.first->second.second = NewCtor; 7305 } 7306 } 7307 } 7308} 7309 7310Sema::ImplicitExceptionSpecification 7311Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7312 // C++ [except.spec]p14: 7313 // An implicitly declared special member function (Clause 12) shall have 7314 // an exception-specification. 7315 ImplicitExceptionSpecification ExceptSpec(Context); 7316 if (ClassDecl->isInvalidDecl()) 7317 return ExceptSpec; 7318 7319 // Direct base-class destructors. 7320 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7321 BEnd = ClassDecl->bases_end(); 7322 B != BEnd; ++B) { 7323 if (B->isVirtual()) // Handled below. 7324 continue; 7325 7326 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7327 ExceptSpec.CalledDecl( 7328 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7329 } 7330 7331 // Virtual base-class destructors. 7332 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7333 BEnd = ClassDecl->vbases_end(); 7334 B != BEnd; ++B) { 7335 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7336 ExceptSpec.CalledDecl( 7337 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7338 } 7339 7340 // Field destructors. 7341 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7342 FEnd = ClassDecl->field_end(); 7343 F != FEnd; ++F) { 7344 if (const RecordType *RecordTy 7345 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7346 ExceptSpec.CalledDecl( 7347 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7348 } 7349 7350 return ExceptSpec; 7351} 7352 7353CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7354 // C++ [class.dtor]p2: 7355 // If a class has no user-declared destructor, a destructor is 7356 // declared implicitly. An implicitly-declared destructor is an 7357 // inline public member of its class. 7358 7359 ImplicitExceptionSpecification Spec = 7360 ComputeDefaultedDtorExceptionSpec(ClassDecl); 7361 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7362 7363 // Create the actual destructor declaration. 7364 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 7365 7366 CanQualType ClassType 7367 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7368 SourceLocation ClassLoc = ClassDecl->getLocation(); 7369 DeclarationName Name 7370 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7371 DeclarationNameInfo NameInfo(Name, ClassLoc); 7372 CXXDestructorDecl *Destructor 7373 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 7374 /*isInline=*/true, 7375 /*isImplicitlyDeclared=*/true); 7376 Destructor->setAccess(AS_public); 7377 Destructor->setDefaulted(); 7378 Destructor->setImplicit(); 7379 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7380 7381 // Note that we have declared this destructor. 7382 ++ASTContext::NumImplicitDestructorsDeclared; 7383 7384 // Introduce this destructor into its scope. 7385 if (Scope *S = getScopeForContext(ClassDecl)) 7386 PushOnScopeChains(Destructor, S, false); 7387 ClassDecl->addDecl(Destructor); 7388 7389 // This could be uniqued if it ever proves significant. 7390 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 7391 7392 if (ShouldDeleteDestructor(Destructor)) 7393 Destructor->setDeletedAsWritten(); 7394 7395 AddOverriddenMethods(ClassDecl, Destructor); 7396 7397 return Destructor; 7398} 7399 7400void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7401 CXXDestructorDecl *Destructor) { 7402 assert((Destructor->isDefaulted() && 7403 !Destructor->doesThisDeclarationHaveABody()) && 7404 "DefineImplicitDestructor - call it for implicit default dtor"); 7405 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7406 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7407 7408 if (Destructor->isInvalidDecl()) 7409 return; 7410 7411 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7412 7413 DiagnosticErrorTrap Trap(Diags); 7414 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7415 Destructor->getParent()); 7416 7417 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7418 Diag(CurrentLocation, diag::note_member_synthesized_at) 7419 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7420 7421 Destructor->setInvalidDecl(); 7422 return; 7423 } 7424 7425 SourceLocation Loc = Destructor->getLocation(); 7426 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7427 Destructor->setImplicitlyDefined(true); 7428 Destructor->setUsed(); 7429 MarkVTableUsed(CurrentLocation, ClassDecl); 7430 7431 if (ASTMutationListener *L = getASTMutationListener()) { 7432 L->CompletedImplicitDefinition(Destructor); 7433 } 7434} 7435 7436void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 7437 CXXDestructorDecl *destructor) { 7438 // C++11 [class.dtor]p3: 7439 // A declaration of a destructor that does not have an exception- 7440 // specification is implicitly considered to have the same exception- 7441 // specification as an implicit declaration. 7442 const FunctionProtoType *dtorType = destructor->getType()-> 7443 getAs<FunctionProtoType>(); 7444 if (dtorType->hasExceptionSpec()) 7445 return; 7446 7447 ImplicitExceptionSpecification exceptSpec = 7448 ComputeDefaultedDtorExceptionSpec(classDecl); 7449 7450 // Replace the destructor's type, building off the existing one. Fortunately, 7451 // the only thing of interest in the destructor type is its extended info. 7452 // The return and arguments are fixed. 7453 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 7454 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 7455 epi.NumExceptions = exceptSpec.size(); 7456 epi.Exceptions = exceptSpec.data(); 7457 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 7458 7459 destructor->setType(ty); 7460 7461 // FIXME: If the destructor has a body that could throw, and the newly created 7462 // spec doesn't allow exceptions, we should emit a warning, because this 7463 // change in behavior can break conforming C++03 programs at runtime. 7464 // However, we don't have a body yet, so it needs to be done somewhere else. 7465} 7466 7467/// \brief Builds a statement that copies/moves the given entity from \p From to 7468/// \c To. 7469/// 7470/// This routine is used to copy/move the members of a class with an 7471/// implicitly-declared copy/move assignment operator. When the entities being 7472/// copied are arrays, this routine builds for loops to copy them. 7473/// 7474/// \param S The Sema object used for type-checking. 7475/// 7476/// \param Loc The location where the implicit copy/move is being generated. 7477/// 7478/// \param T The type of the expressions being copied/moved. Both expressions 7479/// must have this type. 7480/// 7481/// \param To The expression we are copying/moving to. 7482/// 7483/// \param From The expression we are copying/moving from. 7484/// 7485/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7486/// Otherwise, it's a non-static member subobject. 7487/// 7488/// \param Copying Whether we're copying or moving. 7489/// 7490/// \param Depth Internal parameter recording the depth of the recursion. 7491/// 7492/// \returns A statement or a loop that copies the expressions. 7493static StmtResult 7494BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7495 Expr *To, Expr *From, 7496 bool CopyingBaseSubobject, bool Copying, 7497 unsigned Depth = 0) { 7498 // C++0x [class.copy]p28: 7499 // Each subobject is assigned in the manner appropriate to its type: 7500 // 7501 // - if the subobject is of class type, as if by a call to operator= with 7502 // the subobject as the object expression and the corresponding 7503 // subobject of x as a single function argument (as if by explicit 7504 // qualification; that is, ignoring any possible virtual overriding 7505 // functions in more derived classes); 7506 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7507 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7508 7509 // Look for operator=. 7510 DeclarationName Name 7511 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7512 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7513 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7514 7515 // Filter out any result that isn't a copy/move-assignment operator. 7516 LookupResult::Filter F = OpLookup.makeFilter(); 7517 while (F.hasNext()) { 7518 NamedDecl *D = F.next(); 7519 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7520 if (Copying ? Method->isCopyAssignmentOperator() : 7521 Method->isMoveAssignmentOperator()) 7522 continue; 7523 7524 F.erase(); 7525 } 7526 F.done(); 7527 7528 // Suppress the protected check (C++ [class.protected]) for each of the 7529 // assignment operators we found. This strange dance is required when 7530 // we're assigning via a base classes's copy-assignment operator. To 7531 // ensure that we're getting the right base class subobject (without 7532 // ambiguities), we need to cast "this" to that subobject type; to 7533 // ensure that we don't go through the virtual call mechanism, we need 7534 // to qualify the operator= name with the base class (see below). However, 7535 // this means that if the base class has a protected copy assignment 7536 // operator, the protected member access check will fail. So, we 7537 // rewrite "protected" access to "public" access in this case, since we 7538 // know by construction that we're calling from a derived class. 7539 if (CopyingBaseSubobject) { 7540 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7541 L != LEnd; ++L) { 7542 if (L.getAccess() == AS_protected) 7543 L.setAccess(AS_public); 7544 } 7545 } 7546 7547 // Create the nested-name-specifier that will be used to qualify the 7548 // reference to operator=; this is required to suppress the virtual 7549 // call mechanism. 7550 CXXScopeSpec SS; 7551 SS.MakeTrivial(S.Context, 7552 NestedNameSpecifier::Create(S.Context, 0, false, 7553 T.getTypePtr()), 7554 Loc); 7555 7556 // Create the reference to operator=. 7557 ExprResult OpEqualRef 7558 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7559 /*FirstQualifierInScope=*/0, OpLookup, 7560 /*TemplateArgs=*/0, 7561 /*SuppressQualifierCheck=*/true); 7562 if (OpEqualRef.isInvalid()) 7563 return StmtError(); 7564 7565 // Build the call to the assignment operator. 7566 7567 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7568 OpEqualRef.takeAs<Expr>(), 7569 Loc, &From, 1, Loc); 7570 if (Call.isInvalid()) 7571 return StmtError(); 7572 7573 return S.Owned(Call.takeAs<Stmt>()); 7574 } 7575 7576 // - if the subobject is of scalar type, the built-in assignment 7577 // operator is used. 7578 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7579 if (!ArrayTy) { 7580 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7581 if (Assignment.isInvalid()) 7582 return StmtError(); 7583 7584 return S.Owned(Assignment.takeAs<Stmt>()); 7585 } 7586 7587 // - if the subobject is an array, each element is assigned, in the 7588 // manner appropriate to the element type; 7589 7590 // Construct a loop over the array bounds, e.g., 7591 // 7592 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7593 // 7594 // that will copy each of the array elements. 7595 QualType SizeType = S.Context.getSizeType(); 7596 7597 // Create the iteration variable. 7598 IdentifierInfo *IterationVarName = 0; 7599 { 7600 llvm::SmallString<8> Str; 7601 llvm::raw_svector_ostream OS(Str); 7602 OS << "__i" << Depth; 7603 IterationVarName = &S.Context.Idents.get(OS.str()); 7604 } 7605 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7606 IterationVarName, SizeType, 7607 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7608 SC_None, SC_None); 7609 7610 // Initialize the iteration variable to zero. 7611 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7612 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7613 7614 // Create a reference to the iteration variable; we'll use this several 7615 // times throughout. 7616 Expr *IterationVarRef 7617 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 7618 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7619 7620 // Create the DeclStmt that holds the iteration variable. 7621 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7622 7623 // Create the comparison against the array bound. 7624 llvm::APInt Upper 7625 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7626 Expr *Comparison 7627 = new (S.Context) BinaryOperator(IterationVarRef, 7628 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7629 BO_NE, S.Context.BoolTy, 7630 VK_RValue, OK_Ordinary, Loc); 7631 7632 // Create the pre-increment of the iteration variable. 7633 Expr *Increment 7634 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7635 VK_LValue, OK_Ordinary, Loc); 7636 7637 // Subscript the "from" and "to" expressions with the iteration variable. 7638 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7639 IterationVarRef, Loc)); 7640 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7641 IterationVarRef, Loc)); 7642 if (!Copying) // Cast to rvalue 7643 From = CastForMoving(S, From); 7644 7645 // Build the copy/move for an individual element of the array. 7646 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7647 To, From, CopyingBaseSubobject, 7648 Copying, Depth + 1); 7649 if (Copy.isInvalid()) 7650 return StmtError(); 7651 7652 // Construct the loop that copies all elements of this array. 7653 return S.ActOnForStmt(Loc, Loc, InitStmt, 7654 S.MakeFullExpr(Comparison), 7655 0, S.MakeFullExpr(Increment), 7656 Loc, Copy.take()); 7657} 7658 7659std::pair<Sema::ImplicitExceptionSpecification, bool> 7660Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7661 CXXRecordDecl *ClassDecl) { 7662 if (ClassDecl->isInvalidDecl()) 7663 return std::make_pair(ImplicitExceptionSpecification(Context), false); 7664 7665 // C++ [class.copy]p10: 7666 // If the class definition does not explicitly declare a copy 7667 // assignment operator, one is declared implicitly. 7668 // The implicitly-defined copy assignment operator for a class X 7669 // will have the form 7670 // 7671 // X& X::operator=(const X&) 7672 // 7673 // if 7674 bool HasConstCopyAssignment = true; 7675 7676 // -- each direct base class B of X has a copy assignment operator 7677 // whose parameter is of type const B&, const volatile B& or B, 7678 // and 7679 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7680 BaseEnd = ClassDecl->bases_end(); 7681 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7682 // We'll handle this below 7683 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7684 continue; 7685 7686 assert(!Base->getType()->isDependentType() && 7687 "Cannot generate implicit members for class with dependent bases."); 7688 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7689 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7690 &HasConstCopyAssignment); 7691 } 7692 7693 // In C++0x, the above citation has "or virtual added" 7694 if (LangOpts.CPlusPlus0x) { 7695 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7696 BaseEnd = ClassDecl->vbases_end(); 7697 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7698 assert(!Base->getType()->isDependentType() && 7699 "Cannot generate implicit members for class with dependent bases."); 7700 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7701 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7702 &HasConstCopyAssignment); 7703 } 7704 } 7705 7706 // -- for all the nonstatic data members of X that are of a class 7707 // type M (or array thereof), each such class type has a copy 7708 // assignment operator whose parameter is of type const M&, 7709 // const volatile M& or M. 7710 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7711 FieldEnd = ClassDecl->field_end(); 7712 HasConstCopyAssignment && Field != FieldEnd; 7713 ++Field) { 7714 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7715 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7716 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 7717 &HasConstCopyAssignment); 7718 } 7719 } 7720 7721 // Otherwise, the implicitly declared copy assignment operator will 7722 // have the form 7723 // 7724 // X& X::operator=(X&) 7725 7726 // C++ [except.spec]p14: 7727 // An implicitly declared special member function (Clause 12) shall have an 7728 // exception-specification. [...] 7729 7730 // It is unspecified whether or not an implicit copy assignment operator 7731 // attempts to deduplicate calls to assignment operators of virtual bases are 7732 // made. As such, this exception specification is effectively unspecified. 7733 // Based on a similar decision made for constness in C++0x, we're erring on 7734 // the side of assuming such calls to be made regardless of whether they 7735 // actually happen. 7736 ImplicitExceptionSpecification ExceptSpec(Context); 7737 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7738 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7739 BaseEnd = ClassDecl->bases_end(); 7740 Base != BaseEnd; ++Base) { 7741 if (Base->isVirtual()) 7742 continue; 7743 7744 CXXRecordDecl *BaseClassDecl 7745 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7746 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7747 ArgQuals, false, 0)) 7748 ExceptSpec.CalledDecl(CopyAssign); 7749 } 7750 7751 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7752 BaseEnd = ClassDecl->vbases_end(); 7753 Base != BaseEnd; ++Base) { 7754 CXXRecordDecl *BaseClassDecl 7755 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7756 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7757 ArgQuals, false, 0)) 7758 ExceptSpec.CalledDecl(CopyAssign); 7759 } 7760 7761 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7762 FieldEnd = ClassDecl->field_end(); 7763 Field != FieldEnd; 7764 ++Field) { 7765 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7766 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7767 if (CXXMethodDecl *CopyAssign = 7768 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7769 ExceptSpec.CalledDecl(CopyAssign); 7770 } 7771 } 7772 7773 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7774} 7775 7776CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7777 // Note: The following rules are largely analoguous to the copy 7778 // constructor rules. Note that virtual bases are not taken into account 7779 // for determining the argument type of the operator. Note also that 7780 // operators taking an object instead of a reference are allowed. 7781 7782 ImplicitExceptionSpecification Spec(Context); 7783 bool Const; 7784 llvm::tie(Spec, Const) = 7785 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7786 7787 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7788 QualType RetType = Context.getLValueReferenceType(ArgType); 7789 if (Const) 7790 ArgType = ArgType.withConst(); 7791 ArgType = Context.getLValueReferenceType(ArgType); 7792 7793 // An implicitly-declared copy assignment operator is an inline public 7794 // member of its class. 7795 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7796 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7797 SourceLocation ClassLoc = ClassDecl->getLocation(); 7798 DeclarationNameInfo NameInfo(Name, ClassLoc); 7799 CXXMethodDecl *CopyAssignment 7800 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7801 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7802 /*TInfo=*/0, /*isStatic=*/false, 7803 /*StorageClassAsWritten=*/SC_None, 7804 /*isInline=*/true, /*isConstexpr=*/false, 7805 SourceLocation()); 7806 CopyAssignment->setAccess(AS_public); 7807 CopyAssignment->setDefaulted(); 7808 CopyAssignment->setImplicit(); 7809 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7810 7811 // Add the parameter to the operator. 7812 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7813 ClassLoc, ClassLoc, /*Id=*/0, 7814 ArgType, /*TInfo=*/0, 7815 SC_None, 7816 SC_None, 0); 7817 CopyAssignment->setParams(FromParam); 7818 7819 // Note that we have added this copy-assignment operator. 7820 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7821 7822 if (Scope *S = getScopeForContext(ClassDecl)) 7823 PushOnScopeChains(CopyAssignment, S, false); 7824 ClassDecl->addDecl(CopyAssignment); 7825 7826 // C++0x [class.copy]p18: 7827 // ... If the class definition declares a move constructor or move 7828 // assignment operator, the implicitly declared copy assignment operator is 7829 // defined as deleted; ... 7830 if (ClassDecl->hasUserDeclaredMoveConstructor() || 7831 ClassDecl->hasUserDeclaredMoveAssignment() || 7832 ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 7833 CopyAssignment->setDeletedAsWritten(); 7834 7835 AddOverriddenMethods(ClassDecl, CopyAssignment); 7836 return CopyAssignment; 7837} 7838 7839void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7840 CXXMethodDecl *CopyAssignOperator) { 7841 assert((CopyAssignOperator->isDefaulted() && 7842 CopyAssignOperator->isOverloadedOperator() && 7843 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7844 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 7845 "DefineImplicitCopyAssignment called for wrong function"); 7846 7847 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7848 7849 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7850 CopyAssignOperator->setInvalidDecl(); 7851 return; 7852 } 7853 7854 CopyAssignOperator->setUsed(); 7855 7856 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7857 DiagnosticErrorTrap Trap(Diags); 7858 7859 // C++0x [class.copy]p30: 7860 // The implicitly-defined or explicitly-defaulted copy assignment operator 7861 // for a non-union class X performs memberwise copy assignment of its 7862 // subobjects. The direct base classes of X are assigned first, in the 7863 // order of their declaration in the base-specifier-list, and then the 7864 // immediate non-static data members of X are assigned, in the order in 7865 // which they were declared in the class definition. 7866 7867 // The statements that form the synthesized function body. 7868 ASTOwningVector<Stmt*> Statements(*this); 7869 7870 // The parameter for the "other" object, which we are copying from. 7871 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7872 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7873 QualType OtherRefType = Other->getType(); 7874 if (const LValueReferenceType *OtherRef 7875 = OtherRefType->getAs<LValueReferenceType>()) { 7876 OtherRefType = OtherRef->getPointeeType(); 7877 OtherQuals = OtherRefType.getQualifiers(); 7878 } 7879 7880 // Our location for everything implicitly-generated. 7881 SourceLocation Loc = CopyAssignOperator->getLocation(); 7882 7883 // Construct a reference to the "other" object. We'll be using this 7884 // throughout the generated ASTs. 7885 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7886 assert(OtherRef && "Reference to parameter cannot fail!"); 7887 7888 // Construct the "this" pointer. We'll be using this throughout the generated 7889 // ASTs. 7890 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7891 assert(This && "Reference to this cannot fail!"); 7892 7893 // Assign base classes. 7894 bool Invalid = false; 7895 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7896 E = ClassDecl->bases_end(); Base != E; ++Base) { 7897 // Form the assignment: 7898 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7899 QualType BaseType = Base->getType().getUnqualifiedType(); 7900 if (!BaseType->isRecordType()) { 7901 Invalid = true; 7902 continue; 7903 } 7904 7905 CXXCastPath BasePath; 7906 BasePath.push_back(Base); 7907 7908 // Construct the "from" expression, which is an implicit cast to the 7909 // appropriately-qualified base type. 7910 Expr *From = OtherRef; 7911 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7912 CK_UncheckedDerivedToBase, 7913 VK_LValue, &BasePath).take(); 7914 7915 // Dereference "this". 7916 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7917 7918 // Implicitly cast "this" to the appropriately-qualified base type. 7919 To = ImpCastExprToType(To.take(), 7920 Context.getCVRQualifiedType(BaseType, 7921 CopyAssignOperator->getTypeQualifiers()), 7922 CK_UncheckedDerivedToBase, 7923 VK_LValue, &BasePath); 7924 7925 // Build the copy. 7926 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7927 To.get(), From, 7928 /*CopyingBaseSubobject=*/true, 7929 /*Copying=*/true); 7930 if (Copy.isInvalid()) { 7931 Diag(CurrentLocation, diag::note_member_synthesized_at) 7932 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7933 CopyAssignOperator->setInvalidDecl(); 7934 return; 7935 } 7936 7937 // Success! Record the copy. 7938 Statements.push_back(Copy.takeAs<Expr>()); 7939 } 7940 7941 // \brief Reference to the __builtin_memcpy function. 7942 Expr *BuiltinMemCpyRef = 0; 7943 // \brief Reference to the __builtin_objc_memmove_collectable function. 7944 Expr *CollectableMemCpyRef = 0; 7945 7946 // Assign non-static members. 7947 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7948 FieldEnd = ClassDecl->field_end(); 7949 Field != FieldEnd; ++Field) { 7950 if (Field->isUnnamedBitfield()) 7951 continue; 7952 7953 // Check for members of reference type; we can't copy those. 7954 if (Field->getType()->isReferenceType()) { 7955 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7956 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7957 Diag(Field->getLocation(), diag::note_declared_at); 7958 Diag(CurrentLocation, diag::note_member_synthesized_at) 7959 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7960 Invalid = true; 7961 continue; 7962 } 7963 7964 // Check for members of const-qualified, non-class type. 7965 QualType BaseType = Context.getBaseElementType(Field->getType()); 7966 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7967 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7968 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7969 Diag(Field->getLocation(), diag::note_declared_at); 7970 Diag(CurrentLocation, diag::note_member_synthesized_at) 7971 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7972 Invalid = true; 7973 continue; 7974 } 7975 7976 // Suppress assigning zero-width bitfields. 7977 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7978 continue; 7979 7980 QualType FieldType = Field->getType().getNonReferenceType(); 7981 if (FieldType->isIncompleteArrayType()) { 7982 assert(ClassDecl->hasFlexibleArrayMember() && 7983 "Incomplete array type is not valid"); 7984 continue; 7985 } 7986 7987 // Build references to the field in the object we're copying from and to. 7988 CXXScopeSpec SS; // Intentionally empty 7989 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7990 LookupMemberName); 7991 MemberLookup.addDecl(*Field); 7992 MemberLookup.resolveKind(); 7993 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7994 Loc, /*IsArrow=*/false, 7995 SS, 0, MemberLookup, 0); 7996 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7997 Loc, /*IsArrow=*/true, 7998 SS, 0, MemberLookup, 0); 7999 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8000 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8001 8002 // If the field should be copied with __builtin_memcpy rather than via 8003 // explicit assignments, do so. This optimization only applies for arrays 8004 // of scalars and arrays of class type with trivial copy-assignment 8005 // operators. 8006 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8007 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 8008 // Compute the size of the memory buffer to be copied. 8009 QualType SizeType = Context.getSizeType(); 8010 llvm::APInt Size(Context.getTypeSize(SizeType), 8011 Context.getTypeSizeInChars(BaseType).getQuantity()); 8012 for (const ConstantArrayType *Array 8013 = Context.getAsConstantArrayType(FieldType); 8014 Array; 8015 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8016 llvm::APInt ArraySize 8017 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8018 Size *= ArraySize; 8019 } 8020 8021 // Take the address of the field references for "from" and "to". 8022 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 8023 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 8024 8025 bool NeedsCollectableMemCpy = 8026 (BaseType->isRecordType() && 8027 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8028 8029 if (NeedsCollectableMemCpy) { 8030 if (!CollectableMemCpyRef) { 8031 // Create a reference to the __builtin_objc_memmove_collectable function. 8032 LookupResult R(*this, 8033 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8034 Loc, LookupOrdinaryName); 8035 LookupName(R, TUScope, true); 8036 8037 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8038 if (!CollectableMemCpy) { 8039 // Something went horribly wrong earlier, and we will have 8040 // complained about it. 8041 Invalid = true; 8042 continue; 8043 } 8044 8045 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8046 CollectableMemCpy->getType(), 8047 VK_LValue, Loc, 0).take(); 8048 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8049 } 8050 } 8051 // Create a reference to the __builtin_memcpy builtin function. 8052 else if (!BuiltinMemCpyRef) { 8053 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8054 LookupOrdinaryName); 8055 LookupName(R, TUScope, true); 8056 8057 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8058 if (!BuiltinMemCpy) { 8059 // Something went horribly wrong earlier, and we will have complained 8060 // about it. 8061 Invalid = true; 8062 continue; 8063 } 8064 8065 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8066 BuiltinMemCpy->getType(), 8067 VK_LValue, Loc, 0).take(); 8068 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8069 } 8070 8071 ASTOwningVector<Expr*> CallArgs(*this); 8072 CallArgs.push_back(To.takeAs<Expr>()); 8073 CallArgs.push_back(From.takeAs<Expr>()); 8074 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8075 ExprResult Call = ExprError(); 8076 if (NeedsCollectableMemCpy) 8077 Call = ActOnCallExpr(/*Scope=*/0, 8078 CollectableMemCpyRef, 8079 Loc, move_arg(CallArgs), 8080 Loc); 8081 else 8082 Call = ActOnCallExpr(/*Scope=*/0, 8083 BuiltinMemCpyRef, 8084 Loc, move_arg(CallArgs), 8085 Loc); 8086 8087 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8088 Statements.push_back(Call.takeAs<Expr>()); 8089 continue; 8090 } 8091 8092 // Build the copy of this field. 8093 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 8094 To.get(), From.get(), 8095 /*CopyingBaseSubobject=*/false, 8096 /*Copying=*/true); 8097 if (Copy.isInvalid()) { 8098 Diag(CurrentLocation, diag::note_member_synthesized_at) 8099 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8100 CopyAssignOperator->setInvalidDecl(); 8101 return; 8102 } 8103 8104 // Success! Record the copy. 8105 Statements.push_back(Copy.takeAs<Stmt>()); 8106 } 8107 8108 if (!Invalid) { 8109 // Add a "return *this;" 8110 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8111 8112 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8113 if (Return.isInvalid()) 8114 Invalid = true; 8115 else { 8116 Statements.push_back(Return.takeAs<Stmt>()); 8117 8118 if (Trap.hasErrorOccurred()) { 8119 Diag(CurrentLocation, diag::note_member_synthesized_at) 8120 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8121 Invalid = true; 8122 } 8123 } 8124 } 8125 8126 if (Invalid) { 8127 CopyAssignOperator->setInvalidDecl(); 8128 return; 8129 } 8130 8131 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8132 /*isStmtExpr=*/false); 8133 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8134 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 8135 8136 if (ASTMutationListener *L = getASTMutationListener()) { 8137 L->CompletedImplicitDefinition(CopyAssignOperator); 8138 } 8139} 8140 8141Sema::ImplicitExceptionSpecification 8142Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 8143 ImplicitExceptionSpecification ExceptSpec(Context); 8144 8145 if (ClassDecl->isInvalidDecl()) 8146 return ExceptSpec; 8147 8148 // C++0x [except.spec]p14: 8149 // An implicitly declared special member function (Clause 12) shall have an 8150 // exception-specification. [...] 8151 8152 // It is unspecified whether or not an implicit move assignment operator 8153 // attempts to deduplicate calls to assignment operators of virtual bases are 8154 // made. As such, this exception specification is effectively unspecified. 8155 // Based on a similar decision made for constness in C++0x, we're erring on 8156 // the side of assuming such calls to be made regardless of whether they 8157 // actually happen. 8158 // Note that a move constructor is not implicitly declared when there are 8159 // virtual bases, but it can still be user-declared and explicitly defaulted. 8160 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8161 BaseEnd = ClassDecl->bases_end(); 8162 Base != BaseEnd; ++Base) { 8163 if (Base->isVirtual()) 8164 continue; 8165 8166 CXXRecordDecl *BaseClassDecl 8167 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8168 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8169 false, 0)) 8170 ExceptSpec.CalledDecl(MoveAssign); 8171 } 8172 8173 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8174 BaseEnd = ClassDecl->vbases_end(); 8175 Base != BaseEnd; ++Base) { 8176 CXXRecordDecl *BaseClassDecl 8177 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8178 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8179 false, 0)) 8180 ExceptSpec.CalledDecl(MoveAssign); 8181 } 8182 8183 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8184 FieldEnd = ClassDecl->field_end(); 8185 Field != FieldEnd; 8186 ++Field) { 8187 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8188 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8189 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 8190 false, 0)) 8191 ExceptSpec.CalledDecl(MoveAssign); 8192 } 8193 } 8194 8195 return ExceptSpec; 8196} 8197 8198CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8199 // Note: The following rules are largely analoguous to the move 8200 // constructor rules. 8201 8202 ImplicitExceptionSpecification Spec( 8203 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 8204 8205 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8206 QualType RetType = Context.getLValueReferenceType(ArgType); 8207 ArgType = Context.getRValueReferenceType(ArgType); 8208 8209 // An implicitly-declared move assignment operator is an inline public 8210 // member of its class. 8211 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8212 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8213 SourceLocation ClassLoc = ClassDecl->getLocation(); 8214 DeclarationNameInfo NameInfo(Name, ClassLoc); 8215 CXXMethodDecl *MoveAssignment 8216 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8217 Context.getFunctionType(RetType, &ArgType, 1, EPI), 8218 /*TInfo=*/0, /*isStatic=*/false, 8219 /*StorageClassAsWritten=*/SC_None, 8220 /*isInline=*/true, 8221 /*isConstexpr=*/false, 8222 SourceLocation()); 8223 MoveAssignment->setAccess(AS_public); 8224 MoveAssignment->setDefaulted(); 8225 MoveAssignment->setImplicit(); 8226 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8227 8228 // Add the parameter to the operator. 8229 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8230 ClassLoc, ClassLoc, /*Id=*/0, 8231 ArgType, /*TInfo=*/0, 8232 SC_None, 8233 SC_None, 0); 8234 MoveAssignment->setParams(FromParam); 8235 8236 // Note that we have added this copy-assignment operator. 8237 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8238 8239 // C++0x [class.copy]p9: 8240 // If the definition of a class X does not explicitly declare a move 8241 // assignment operator, one will be implicitly declared as defaulted if and 8242 // only if: 8243 // [...] 8244 // - the move assignment operator would not be implicitly defined as 8245 // deleted. 8246 if (ShouldDeleteMoveAssignmentOperator(MoveAssignment)) { 8247 // Cache this result so that we don't try to generate this over and over 8248 // on every lookup, leaking memory and wasting time. 8249 ClassDecl->setFailedImplicitMoveAssignment(); 8250 return 0; 8251 } 8252 8253 if (Scope *S = getScopeForContext(ClassDecl)) 8254 PushOnScopeChains(MoveAssignment, S, false); 8255 ClassDecl->addDecl(MoveAssignment); 8256 8257 AddOverriddenMethods(ClassDecl, MoveAssignment); 8258 return MoveAssignment; 8259} 8260 8261void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8262 CXXMethodDecl *MoveAssignOperator) { 8263 assert((MoveAssignOperator->isDefaulted() && 8264 MoveAssignOperator->isOverloadedOperator() && 8265 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8266 !MoveAssignOperator->doesThisDeclarationHaveABody()) && 8267 "DefineImplicitMoveAssignment called for wrong function"); 8268 8269 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8270 8271 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8272 MoveAssignOperator->setInvalidDecl(); 8273 return; 8274 } 8275 8276 MoveAssignOperator->setUsed(); 8277 8278 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8279 DiagnosticErrorTrap Trap(Diags); 8280 8281 // C++0x [class.copy]p28: 8282 // The implicitly-defined or move assignment operator for a non-union class 8283 // X performs memberwise move assignment of its subobjects. The direct base 8284 // classes of X are assigned first, in the order of their declaration in the 8285 // base-specifier-list, and then the immediate non-static data members of X 8286 // are assigned, in the order in which they were declared in the class 8287 // definition. 8288 8289 // The statements that form the synthesized function body. 8290 ASTOwningVector<Stmt*> Statements(*this); 8291 8292 // The parameter for the "other" object, which we are move from. 8293 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8294 QualType OtherRefType = Other->getType()-> 8295 getAs<RValueReferenceType>()->getPointeeType(); 8296 assert(OtherRefType.getQualifiers() == 0 && 8297 "Bad argument type of defaulted move assignment"); 8298 8299 // Our location for everything implicitly-generated. 8300 SourceLocation Loc = MoveAssignOperator->getLocation(); 8301 8302 // Construct a reference to the "other" object. We'll be using this 8303 // throughout the generated ASTs. 8304 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8305 assert(OtherRef && "Reference to parameter cannot fail!"); 8306 // Cast to rvalue. 8307 OtherRef = CastForMoving(*this, OtherRef); 8308 8309 // Construct the "this" pointer. We'll be using this throughout the generated 8310 // ASTs. 8311 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8312 assert(This && "Reference to this cannot fail!"); 8313 8314 // Assign base classes. 8315 bool Invalid = false; 8316 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8317 E = ClassDecl->bases_end(); Base != E; ++Base) { 8318 // Form the assignment: 8319 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8320 QualType BaseType = Base->getType().getUnqualifiedType(); 8321 if (!BaseType->isRecordType()) { 8322 Invalid = true; 8323 continue; 8324 } 8325 8326 CXXCastPath BasePath; 8327 BasePath.push_back(Base); 8328 8329 // Construct the "from" expression, which is an implicit cast to the 8330 // appropriately-qualified base type. 8331 Expr *From = OtherRef; 8332 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8333 VK_XValue, &BasePath).take(); 8334 8335 // Dereference "this". 8336 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8337 8338 // Implicitly cast "this" to the appropriately-qualified base type. 8339 To = ImpCastExprToType(To.take(), 8340 Context.getCVRQualifiedType(BaseType, 8341 MoveAssignOperator->getTypeQualifiers()), 8342 CK_UncheckedDerivedToBase, 8343 VK_LValue, &BasePath); 8344 8345 // Build the move. 8346 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8347 To.get(), From, 8348 /*CopyingBaseSubobject=*/true, 8349 /*Copying=*/false); 8350 if (Move.isInvalid()) { 8351 Diag(CurrentLocation, diag::note_member_synthesized_at) 8352 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8353 MoveAssignOperator->setInvalidDecl(); 8354 return; 8355 } 8356 8357 // Success! Record the move. 8358 Statements.push_back(Move.takeAs<Expr>()); 8359 } 8360 8361 // \brief Reference to the __builtin_memcpy function. 8362 Expr *BuiltinMemCpyRef = 0; 8363 // \brief Reference to the __builtin_objc_memmove_collectable function. 8364 Expr *CollectableMemCpyRef = 0; 8365 8366 // Assign non-static members. 8367 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8368 FieldEnd = ClassDecl->field_end(); 8369 Field != FieldEnd; ++Field) { 8370 if (Field->isUnnamedBitfield()) 8371 continue; 8372 8373 // Check for members of reference type; we can't move those. 8374 if (Field->getType()->isReferenceType()) { 8375 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8376 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8377 Diag(Field->getLocation(), diag::note_declared_at); 8378 Diag(CurrentLocation, diag::note_member_synthesized_at) 8379 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8380 Invalid = true; 8381 continue; 8382 } 8383 8384 // Check for members of const-qualified, non-class type. 8385 QualType BaseType = Context.getBaseElementType(Field->getType()); 8386 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8387 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8388 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8389 Diag(Field->getLocation(), diag::note_declared_at); 8390 Diag(CurrentLocation, diag::note_member_synthesized_at) 8391 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8392 Invalid = true; 8393 continue; 8394 } 8395 8396 // Suppress assigning zero-width bitfields. 8397 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8398 continue; 8399 8400 QualType FieldType = Field->getType().getNonReferenceType(); 8401 if (FieldType->isIncompleteArrayType()) { 8402 assert(ClassDecl->hasFlexibleArrayMember() && 8403 "Incomplete array type is not valid"); 8404 continue; 8405 } 8406 8407 // Build references to the field in the object we're copying from and to. 8408 CXXScopeSpec SS; // Intentionally empty 8409 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8410 LookupMemberName); 8411 MemberLookup.addDecl(*Field); 8412 MemberLookup.resolveKind(); 8413 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8414 Loc, /*IsArrow=*/false, 8415 SS, 0, MemberLookup, 0); 8416 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8417 Loc, /*IsArrow=*/true, 8418 SS, 0, MemberLookup, 0); 8419 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8420 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8421 8422 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8423 "Member reference with rvalue base must be rvalue except for reference " 8424 "members, which aren't allowed for move assignment."); 8425 8426 // If the field should be copied with __builtin_memcpy rather than via 8427 // explicit assignments, do so. This optimization only applies for arrays 8428 // of scalars and arrays of class type with trivial move-assignment 8429 // operators. 8430 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8431 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8432 // Compute the size of the memory buffer to be copied. 8433 QualType SizeType = Context.getSizeType(); 8434 llvm::APInt Size(Context.getTypeSize(SizeType), 8435 Context.getTypeSizeInChars(BaseType).getQuantity()); 8436 for (const ConstantArrayType *Array 8437 = Context.getAsConstantArrayType(FieldType); 8438 Array; 8439 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8440 llvm::APInt ArraySize 8441 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8442 Size *= ArraySize; 8443 } 8444 8445 // Take the address of the field references for "from" and "to". We 8446 // directly construct UnaryOperators here because semantic analysis 8447 // does not permit us to take the address of an xvalue. 8448 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8449 Context.getPointerType(From.get()->getType()), 8450 VK_RValue, OK_Ordinary, Loc); 8451 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8452 Context.getPointerType(To.get()->getType()), 8453 VK_RValue, OK_Ordinary, Loc); 8454 8455 bool NeedsCollectableMemCpy = 8456 (BaseType->isRecordType() && 8457 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8458 8459 if (NeedsCollectableMemCpy) { 8460 if (!CollectableMemCpyRef) { 8461 // Create a reference to the __builtin_objc_memmove_collectable function. 8462 LookupResult R(*this, 8463 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8464 Loc, LookupOrdinaryName); 8465 LookupName(R, TUScope, true); 8466 8467 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8468 if (!CollectableMemCpy) { 8469 // Something went horribly wrong earlier, and we will have 8470 // complained about it. 8471 Invalid = true; 8472 continue; 8473 } 8474 8475 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8476 CollectableMemCpy->getType(), 8477 VK_LValue, Loc, 0).take(); 8478 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8479 } 8480 } 8481 // Create a reference to the __builtin_memcpy builtin function. 8482 else if (!BuiltinMemCpyRef) { 8483 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8484 LookupOrdinaryName); 8485 LookupName(R, TUScope, true); 8486 8487 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8488 if (!BuiltinMemCpy) { 8489 // Something went horribly wrong earlier, and we will have complained 8490 // about it. 8491 Invalid = true; 8492 continue; 8493 } 8494 8495 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8496 BuiltinMemCpy->getType(), 8497 VK_LValue, Loc, 0).take(); 8498 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8499 } 8500 8501 ASTOwningVector<Expr*> CallArgs(*this); 8502 CallArgs.push_back(To.takeAs<Expr>()); 8503 CallArgs.push_back(From.takeAs<Expr>()); 8504 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8505 ExprResult Call = ExprError(); 8506 if (NeedsCollectableMemCpy) 8507 Call = ActOnCallExpr(/*Scope=*/0, 8508 CollectableMemCpyRef, 8509 Loc, move_arg(CallArgs), 8510 Loc); 8511 else 8512 Call = ActOnCallExpr(/*Scope=*/0, 8513 BuiltinMemCpyRef, 8514 Loc, move_arg(CallArgs), 8515 Loc); 8516 8517 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8518 Statements.push_back(Call.takeAs<Expr>()); 8519 continue; 8520 } 8521 8522 // Build the move of this field. 8523 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8524 To.get(), From.get(), 8525 /*CopyingBaseSubobject=*/false, 8526 /*Copying=*/false); 8527 if (Move.isInvalid()) { 8528 Diag(CurrentLocation, diag::note_member_synthesized_at) 8529 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8530 MoveAssignOperator->setInvalidDecl(); 8531 return; 8532 } 8533 8534 // Success! Record the copy. 8535 Statements.push_back(Move.takeAs<Stmt>()); 8536 } 8537 8538 if (!Invalid) { 8539 // Add a "return *this;" 8540 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8541 8542 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8543 if (Return.isInvalid()) 8544 Invalid = true; 8545 else { 8546 Statements.push_back(Return.takeAs<Stmt>()); 8547 8548 if (Trap.hasErrorOccurred()) { 8549 Diag(CurrentLocation, diag::note_member_synthesized_at) 8550 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8551 Invalid = true; 8552 } 8553 } 8554 } 8555 8556 if (Invalid) { 8557 MoveAssignOperator->setInvalidDecl(); 8558 return; 8559 } 8560 8561 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8562 /*isStmtExpr=*/false); 8563 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8564 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8565 8566 if (ASTMutationListener *L = getASTMutationListener()) { 8567 L->CompletedImplicitDefinition(MoveAssignOperator); 8568 } 8569} 8570 8571std::pair<Sema::ImplicitExceptionSpecification, bool> 8572Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8573 if (ClassDecl->isInvalidDecl()) 8574 return std::make_pair(ImplicitExceptionSpecification(Context), false); 8575 8576 // C++ [class.copy]p5: 8577 // The implicitly-declared copy constructor for a class X will 8578 // have the form 8579 // 8580 // X::X(const X&) 8581 // 8582 // if 8583 // FIXME: It ought to be possible to store this on the record. 8584 bool HasConstCopyConstructor = true; 8585 8586 // -- each direct or virtual base class B of X has a copy 8587 // constructor whose first parameter is of type const B& or 8588 // const volatile B&, and 8589 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8590 BaseEnd = ClassDecl->bases_end(); 8591 HasConstCopyConstructor && Base != BaseEnd; 8592 ++Base) { 8593 // Virtual bases are handled below. 8594 if (Base->isVirtual()) 8595 continue; 8596 8597 CXXRecordDecl *BaseClassDecl 8598 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8599 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8600 &HasConstCopyConstructor); 8601 } 8602 8603 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8604 BaseEnd = ClassDecl->vbases_end(); 8605 HasConstCopyConstructor && Base != BaseEnd; 8606 ++Base) { 8607 CXXRecordDecl *BaseClassDecl 8608 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8609 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8610 &HasConstCopyConstructor); 8611 } 8612 8613 // -- for all the nonstatic data members of X that are of a 8614 // class type M (or array thereof), each such class type 8615 // has a copy constructor whose first parameter is of type 8616 // const M& or const volatile M&. 8617 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8618 FieldEnd = ClassDecl->field_end(); 8619 HasConstCopyConstructor && Field != FieldEnd; 8620 ++Field) { 8621 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8622 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8623 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 8624 &HasConstCopyConstructor); 8625 } 8626 } 8627 // Otherwise, the implicitly declared copy constructor will have 8628 // the form 8629 // 8630 // X::X(X&) 8631 8632 // C++ [except.spec]p14: 8633 // An implicitly declared special member function (Clause 12) shall have an 8634 // exception-specification. [...] 8635 ImplicitExceptionSpecification ExceptSpec(Context); 8636 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8637 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8638 BaseEnd = ClassDecl->bases_end(); 8639 Base != BaseEnd; 8640 ++Base) { 8641 // Virtual bases are handled below. 8642 if (Base->isVirtual()) 8643 continue; 8644 8645 CXXRecordDecl *BaseClassDecl 8646 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8647 if (CXXConstructorDecl *CopyConstructor = 8648 LookupCopyingConstructor(BaseClassDecl, Quals)) 8649 ExceptSpec.CalledDecl(CopyConstructor); 8650 } 8651 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8652 BaseEnd = ClassDecl->vbases_end(); 8653 Base != BaseEnd; 8654 ++Base) { 8655 CXXRecordDecl *BaseClassDecl 8656 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8657 if (CXXConstructorDecl *CopyConstructor = 8658 LookupCopyingConstructor(BaseClassDecl, Quals)) 8659 ExceptSpec.CalledDecl(CopyConstructor); 8660 } 8661 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8662 FieldEnd = ClassDecl->field_end(); 8663 Field != FieldEnd; 8664 ++Field) { 8665 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8666 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8667 if (CXXConstructorDecl *CopyConstructor = 8668 LookupCopyingConstructor(FieldClassDecl, Quals)) 8669 ExceptSpec.CalledDecl(CopyConstructor); 8670 } 8671 } 8672 8673 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8674} 8675 8676CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8677 CXXRecordDecl *ClassDecl) { 8678 // C++ [class.copy]p4: 8679 // If the class definition does not explicitly declare a copy 8680 // constructor, one is declared implicitly. 8681 8682 ImplicitExceptionSpecification Spec(Context); 8683 bool Const; 8684 llvm::tie(Spec, Const) = 8685 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8686 8687 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8688 QualType ArgType = ClassType; 8689 if (Const) 8690 ArgType = ArgType.withConst(); 8691 ArgType = Context.getLValueReferenceType(ArgType); 8692 8693 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8694 8695 DeclarationName Name 8696 = Context.DeclarationNames.getCXXConstructorName( 8697 Context.getCanonicalType(ClassType)); 8698 SourceLocation ClassLoc = ClassDecl->getLocation(); 8699 DeclarationNameInfo NameInfo(Name, ClassLoc); 8700 8701 // An implicitly-declared copy constructor is an inline public 8702 // member of its class. 8703 CXXConstructorDecl *CopyConstructor 8704 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8705 Context.getFunctionType(Context.VoidTy, 8706 &ArgType, 1, EPI), 8707 /*TInfo=*/0, 8708 /*isExplicit=*/false, 8709 /*isInline=*/true, 8710 /*isImplicitlyDeclared=*/true, 8711 // FIXME: apply the rules for definitions here 8712 /*isConstexpr=*/false); 8713 CopyConstructor->setAccess(AS_public); 8714 CopyConstructor->setDefaulted(); 8715 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8716 8717 // Note that we have declared this constructor. 8718 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8719 8720 // Add the parameter to the constructor. 8721 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8722 ClassLoc, ClassLoc, 8723 /*IdentifierInfo=*/0, 8724 ArgType, /*TInfo=*/0, 8725 SC_None, 8726 SC_None, 0); 8727 CopyConstructor->setParams(FromParam); 8728 8729 if (Scope *S = getScopeForContext(ClassDecl)) 8730 PushOnScopeChains(CopyConstructor, S, false); 8731 ClassDecl->addDecl(CopyConstructor); 8732 8733 // C++0x [class.copy]p7: 8734 // ... If the class definition declares a move constructor or move 8735 // assignment operator, the implicitly declared constructor is defined as 8736 // deleted; ... 8737 if (ClassDecl->hasUserDeclaredMoveConstructor() || 8738 ClassDecl->hasUserDeclaredMoveAssignment() || 8739 ShouldDeleteCopyConstructor(CopyConstructor)) 8740 CopyConstructor->setDeletedAsWritten(); 8741 8742 return CopyConstructor; 8743} 8744 8745void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8746 CXXConstructorDecl *CopyConstructor) { 8747 assert((CopyConstructor->isDefaulted() && 8748 CopyConstructor->isCopyConstructor() && 8749 !CopyConstructor->doesThisDeclarationHaveABody()) && 8750 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8751 8752 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8753 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8754 8755 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8756 DiagnosticErrorTrap Trap(Diags); 8757 8758 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8759 Trap.hasErrorOccurred()) { 8760 Diag(CurrentLocation, diag::note_member_synthesized_at) 8761 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8762 CopyConstructor->setInvalidDecl(); 8763 } else { 8764 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8765 CopyConstructor->getLocation(), 8766 MultiStmtArg(*this, 0, 0), 8767 /*isStmtExpr=*/false) 8768 .takeAs<Stmt>()); 8769 CopyConstructor->setImplicitlyDefined(true); 8770 } 8771 8772 CopyConstructor->setUsed(); 8773 if (ASTMutationListener *L = getASTMutationListener()) { 8774 L->CompletedImplicitDefinition(CopyConstructor); 8775 } 8776} 8777 8778Sema::ImplicitExceptionSpecification 8779Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8780 // C++ [except.spec]p14: 8781 // An implicitly declared special member function (Clause 12) shall have an 8782 // exception-specification. [...] 8783 ImplicitExceptionSpecification ExceptSpec(Context); 8784 if (ClassDecl->isInvalidDecl()) 8785 return ExceptSpec; 8786 8787 // Direct base-class constructors. 8788 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8789 BEnd = ClassDecl->bases_end(); 8790 B != BEnd; ++B) { 8791 if (B->isVirtual()) // Handled below. 8792 continue; 8793 8794 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8795 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8796 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8797 // If this is a deleted function, add it anyway. This might be conformant 8798 // with the standard. This might not. I'm not sure. It might not matter. 8799 if (Constructor) 8800 ExceptSpec.CalledDecl(Constructor); 8801 } 8802 } 8803 8804 // Virtual base-class constructors. 8805 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8806 BEnd = ClassDecl->vbases_end(); 8807 B != BEnd; ++B) { 8808 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8809 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8810 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8811 // If this is a deleted function, add it anyway. This might be conformant 8812 // with the standard. This might not. I'm not sure. It might not matter. 8813 if (Constructor) 8814 ExceptSpec.CalledDecl(Constructor); 8815 } 8816 } 8817 8818 // Field constructors. 8819 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8820 FEnd = ClassDecl->field_end(); 8821 F != FEnd; ++F) { 8822 if (F->hasInClassInitializer()) { 8823 if (Expr *E = F->getInClassInitializer()) 8824 ExceptSpec.CalledExpr(E); 8825 else if (!F->isInvalidDecl()) 8826 ExceptSpec.SetDelayed(); 8827 } else if (const RecordType *RecordTy 8828 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8829 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8830 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8831 // If this is a deleted function, add it anyway. This might be conformant 8832 // with the standard. This might not. I'm not sure. It might not matter. 8833 // In particular, the problem is that this function never gets called. It 8834 // might just be ill-formed because this function attempts to refer to 8835 // a deleted function here. 8836 if (Constructor) 8837 ExceptSpec.CalledDecl(Constructor); 8838 } 8839 } 8840 8841 return ExceptSpec; 8842} 8843 8844CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8845 CXXRecordDecl *ClassDecl) { 8846 ImplicitExceptionSpecification Spec( 8847 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8848 8849 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8850 QualType ArgType = Context.getRValueReferenceType(ClassType); 8851 8852 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8853 8854 DeclarationName Name 8855 = Context.DeclarationNames.getCXXConstructorName( 8856 Context.getCanonicalType(ClassType)); 8857 SourceLocation ClassLoc = ClassDecl->getLocation(); 8858 DeclarationNameInfo NameInfo(Name, ClassLoc); 8859 8860 // C++0x [class.copy]p11: 8861 // An implicitly-declared copy/move constructor is an inline public 8862 // member of its class. 8863 CXXConstructorDecl *MoveConstructor 8864 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8865 Context.getFunctionType(Context.VoidTy, 8866 &ArgType, 1, EPI), 8867 /*TInfo=*/0, 8868 /*isExplicit=*/false, 8869 /*isInline=*/true, 8870 /*isImplicitlyDeclared=*/true, 8871 // FIXME: apply the rules for definitions here 8872 /*isConstexpr=*/false); 8873 MoveConstructor->setAccess(AS_public); 8874 MoveConstructor->setDefaulted(); 8875 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8876 8877 // Add the parameter to the constructor. 8878 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8879 ClassLoc, ClassLoc, 8880 /*IdentifierInfo=*/0, 8881 ArgType, /*TInfo=*/0, 8882 SC_None, 8883 SC_None, 0); 8884 MoveConstructor->setParams(FromParam); 8885 8886 // C++0x [class.copy]p9: 8887 // If the definition of a class X does not explicitly declare a move 8888 // constructor, one will be implicitly declared as defaulted if and only if: 8889 // [...] 8890 // - the move constructor would not be implicitly defined as deleted. 8891 if (ShouldDeleteMoveConstructor(MoveConstructor)) { 8892 // Cache this result so that we don't try to generate this over and over 8893 // on every lookup, leaking memory and wasting time. 8894 ClassDecl->setFailedImplicitMoveConstructor(); 8895 return 0; 8896 } 8897 8898 // Note that we have declared this constructor. 8899 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8900 8901 if (Scope *S = getScopeForContext(ClassDecl)) 8902 PushOnScopeChains(MoveConstructor, S, false); 8903 ClassDecl->addDecl(MoveConstructor); 8904 8905 return MoveConstructor; 8906} 8907 8908void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8909 CXXConstructorDecl *MoveConstructor) { 8910 assert((MoveConstructor->isDefaulted() && 8911 MoveConstructor->isMoveConstructor() && 8912 !MoveConstructor->doesThisDeclarationHaveABody()) && 8913 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8914 8915 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8916 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8917 8918 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8919 DiagnosticErrorTrap Trap(Diags); 8920 8921 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8922 Trap.hasErrorOccurred()) { 8923 Diag(CurrentLocation, diag::note_member_synthesized_at) 8924 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8925 MoveConstructor->setInvalidDecl(); 8926 } else { 8927 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8928 MoveConstructor->getLocation(), 8929 MultiStmtArg(*this, 0, 0), 8930 /*isStmtExpr=*/false) 8931 .takeAs<Stmt>()); 8932 MoveConstructor->setImplicitlyDefined(true); 8933 } 8934 8935 MoveConstructor->setUsed(); 8936 8937 if (ASTMutationListener *L = getASTMutationListener()) { 8938 L->CompletedImplicitDefinition(MoveConstructor); 8939 } 8940} 8941 8942ExprResult 8943Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8944 CXXConstructorDecl *Constructor, 8945 MultiExprArg ExprArgs, 8946 bool HadMultipleCandidates, 8947 bool RequiresZeroInit, 8948 unsigned ConstructKind, 8949 SourceRange ParenRange) { 8950 bool Elidable = false; 8951 8952 // C++0x [class.copy]p34: 8953 // When certain criteria are met, an implementation is allowed to 8954 // omit the copy/move construction of a class object, even if the 8955 // copy/move constructor and/or destructor for the object have 8956 // side effects. [...] 8957 // - when a temporary class object that has not been bound to a 8958 // reference (12.2) would be copied/moved to a class object 8959 // with the same cv-unqualified type, the copy/move operation 8960 // can be omitted by constructing the temporary object 8961 // directly into the target of the omitted copy/move 8962 if (ConstructKind == CXXConstructExpr::CK_Complete && 8963 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 8964 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 8965 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 8966 } 8967 8968 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 8969 Elidable, move(ExprArgs), HadMultipleCandidates, 8970 RequiresZeroInit, ConstructKind, ParenRange); 8971} 8972 8973/// BuildCXXConstructExpr - Creates a complete call to a constructor, 8974/// including handling of its default argument expressions. 8975ExprResult 8976Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8977 CXXConstructorDecl *Constructor, bool Elidable, 8978 MultiExprArg ExprArgs, 8979 bool HadMultipleCandidates, 8980 bool RequiresZeroInit, 8981 unsigned ConstructKind, 8982 SourceRange ParenRange) { 8983 unsigned NumExprs = ExprArgs.size(); 8984 Expr **Exprs = (Expr **)ExprArgs.release(); 8985 8986 for (specific_attr_iterator<NonNullAttr> 8987 i = Constructor->specific_attr_begin<NonNullAttr>(), 8988 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 8989 const NonNullAttr *NonNull = *i; 8990 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 8991 } 8992 8993 MarkDeclarationReferenced(ConstructLoc, Constructor); 8994 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 8995 Constructor, Elidable, Exprs, NumExprs, 8996 HadMultipleCandidates, RequiresZeroInit, 8997 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 8998 ParenRange)); 8999} 9000 9001bool Sema::InitializeVarWithConstructor(VarDecl *VD, 9002 CXXConstructorDecl *Constructor, 9003 MultiExprArg Exprs, 9004 bool HadMultipleCandidates) { 9005 // FIXME: Provide the correct paren SourceRange when available. 9006 ExprResult TempResult = 9007 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 9008 move(Exprs), HadMultipleCandidates, false, 9009 CXXConstructExpr::CK_Complete, SourceRange()); 9010 if (TempResult.isInvalid()) 9011 return true; 9012 9013 Expr *Temp = TempResult.takeAs<Expr>(); 9014 CheckImplicitConversions(Temp, VD->getLocation()); 9015 MarkDeclarationReferenced(VD->getLocation(), Constructor); 9016 Temp = MaybeCreateExprWithCleanups(Temp); 9017 VD->setInit(Temp); 9018 9019 return false; 9020} 9021 9022void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9023 if (VD->isInvalidDecl()) return; 9024 9025 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9026 if (ClassDecl->isInvalidDecl()) return; 9027 if (ClassDecl->hasTrivialDestructor()) return; 9028 if (ClassDecl->isDependentContext()) return; 9029 9030 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9031 MarkDeclarationReferenced(VD->getLocation(), Destructor); 9032 CheckDestructorAccess(VD->getLocation(), Destructor, 9033 PDiag(diag::err_access_dtor_var) 9034 << VD->getDeclName() 9035 << VD->getType()); 9036 9037 if (!VD->hasGlobalStorage()) return; 9038 9039 // Emit warning for non-trivial dtor in global scope (a real global, 9040 // class-static, function-static). 9041 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9042 9043 // TODO: this should be re-enabled for static locals by !CXAAtExit 9044 if (!VD->isStaticLocal()) 9045 Diag(VD->getLocation(), diag::warn_global_destructor); 9046} 9047 9048/// AddCXXDirectInitializerToDecl - This action is called immediately after 9049/// ActOnDeclarator, when a C++ direct initializer is present. 9050/// e.g: "int x(1);" 9051void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 9052 SourceLocation LParenLoc, 9053 MultiExprArg Exprs, 9054 SourceLocation RParenLoc, 9055 bool TypeMayContainAuto) { 9056 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 9057 9058 // If there is no declaration, there was an error parsing it. Just ignore 9059 // the initializer. 9060 if (RealDecl == 0) 9061 return; 9062 9063 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 9064 if (!VDecl) { 9065 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 9066 RealDecl->setInvalidDecl(); 9067 return; 9068 } 9069 9070 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 9071 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 9072 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 9073 if (Exprs.size() > 1) { 9074 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 9075 diag::err_auto_var_init_multiple_expressions) 9076 << VDecl->getDeclName() << VDecl->getType() 9077 << VDecl->getSourceRange(); 9078 RealDecl->setInvalidDecl(); 9079 return; 9080 } 9081 9082 Expr *Init = Exprs.get()[0]; 9083 TypeSourceInfo *DeducedType = 0; 9084 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 9085 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 9086 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 9087 << Init->getSourceRange(); 9088 if (!DeducedType) { 9089 RealDecl->setInvalidDecl(); 9090 return; 9091 } 9092 VDecl->setTypeSourceInfo(DeducedType); 9093 VDecl->setType(DeducedType->getType()); 9094 9095 // In ARC, infer lifetime. 9096 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 9097 VDecl->setInvalidDecl(); 9098 9099 // If this is a redeclaration, check that the type we just deduced matches 9100 // the previously declared type. 9101 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 9102 MergeVarDeclTypes(VDecl, Old); 9103 } 9104 9105 // We will represent direct-initialization similarly to copy-initialization: 9106 // int x(1); -as-> int x = 1; 9107 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 9108 // 9109 // Clients that want to distinguish between the two forms, can check for 9110 // direct initializer using VarDecl::hasCXXDirectInitializer(). 9111 // A major benefit is that clients that don't particularly care about which 9112 // exactly form was it (like the CodeGen) can handle both cases without 9113 // special case code. 9114 9115 // C++ 8.5p11: 9116 // The form of initialization (using parentheses or '=') is generally 9117 // insignificant, but does matter when the entity being initialized has a 9118 // class type. 9119 9120 if (!VDecl->getType()->isDependentType() && 9121 !VDecl->getType()->isIncompleteArrayType() && 9122 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 9123 diag::err_typecheck_decl_incomplete_type)) { 9124 VDecl->setInvalidDecl(); 9125 return; 9126 } 9127 9128 // The variable can not have an abstract class type. 9129 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 9130 diag::err_abstract_type_in_decl, 9131 AbstractVariableType)) 9132 VDecl->setInvalidDecl(); 9133 9134 const VarDecl *Def; 9135 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 9136 Diag(VDecl->getLocation(), diag::err_redefinition) 9137 << VDecl->getDeclName(); 9138 Diag(Def->getLocation(), diag::note_previous_definition); 9139 VDecl->setInvalidDecl(); 9140 return; 9141 } 9142 9143 // C++ [class.static.data]p4 9144 // If a static data member is of const integral or const 9145 // enumeration type, its declaration in the class definition can 9146 // specify a constant-initializer which shall be an integral 9147 // constant expression (5.19). In that case, the member can appear 9148 // in integral constant expressions. The member shall still be 9149 // defined in a namespace scope if it is used in the program and the 9150 // namespace scope definition shall not contain an initializer. 9151 // 9152 // We already performed a redefinition check above, but for static 9153 // data members we also need to check whether there was an in-class 9154 // declaration with an initializer. 9155 const VarDecl* PrevInit = 0; 9156 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 9157 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 9158 Diag(PrevInit->getLocation(), diag::note_previous_definition); 9159 return; 9160 } 9161 9162 bool IsDependent = false; 9163 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 9164 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 9165 VDecl->setInvalidDecl(); 9166 return; 9167 } 9168 9169 if (Exprs.get()[I]->isTypeDependent()) 9170 IsDependent = true; 9171 } 9172 9173 // If either the declaration has a dependent type or if any of the 9174 // expressions is type-dependent, we represent the initialization 9175 // via a ParenListExpr for later use during template instantiation. 9176 if (VDecl->getType()->isDependentType() || IsDependent) { 9177 // Let clients know that initialization was done with a direct initializer. 9178 VDecl->setCXXDirectInitializer(true); 9179 9180 // Store the initialization expressions as a ParenListExpr. 9181 unsigned NumExprs = Exprs.size(); 9182 VDecl->setInit(new (Context) ParenListExpr( 9183 Context, LParenLoc, (Expr **)Exprs.release(), NumExprs, RParenLoc, 9184 VDecl->getType().getNonReferenceType())); 9185 return; 9186 } 9187 9188 // Capture the variable that is being initialized and the style of 9189 // initialization. 9190 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 9191 9192 // FIXME: Poor source location information. 9193 InitializationKind Kind 9194 = InitializationKind::CreateDirect(VDecl->getLocation(), 9195 LParenLoc, RParenLoc); 9196 9197 QualType T = VDecl->getType(); 9198 InitializationSequence InitSeq(*this, Entity, Kind, 9199 Exprs.get(), Exprs.size()); 9200 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs), &T); 9201 if (Result.isInvalid()) { 9202 VDecl->setInvalidDecl(); 9203 return; 9204 } else if (T != VDecl->getType()) { 9205 VDecl->setType(T); 9206 Result.get()->setType(T); 9207 } 9208 9209 9210 Expr *Init = Result.get(); 9211 CheckImplicitConversions(Init, LParenLoc); 9212 9213 if (VDecl->isConstexpr() && !VDecl->isInvalidDecl() && 9214 !Init->isValueDependent() && 9215 !Init->isConstantInitializer(Context, 9216 VDecl->getType()->isReferenceType())) { 9217 // FIXME: Improve this diagnostic to explain why the initializer is not 9218 // a constant expression. 9219 Diag(VDecl->getLocation(), diag::err_constexpr_var_requires_const_init) 9220 << VDecl << Init->getSourceRange(); 9221 } 9222 9223 Init = MaybeCreateExprWithCleanups(Init); 9224 VDecl->setInit(Init); 9225 VDecl->setCXXDirectInitializer(true); 9226 9227 CheckCompleteVariableDeclaration(VDecl); 9228} 9229 9230/// \brief Given a constructor and the set of arguments provided for the 9231/// constructor, convert the arguments and add any required default arguments 9232/// to form a proper call to this constructor. 9233/// 9234/// \returns true if an error occurred, false otherwise. 9235bool 9236Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9237 MultiExprArg ArgsPtr, 9238 SourceLocation Loc, 9239 ASTOwningVector<Expr*> &ConvertedArgs) { 9240 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9241 unsigned NumArgs = ArgsPtr.size(); 9242 Expr **Args = (Expr **)ArgsPtr.get(); 9243 9244 const FunctionProtoType *Proto 9245 = Constructor->getType()->getAs<FunctionProtoType>(); 9246 assert(Proto && "Constructor without a prototype?"); 9247 unsigned NumArgsInProto = Proto->getNumArgs(); 9248 9249 // If too few arguments are available, we'll fill in the rest with defaults. 9250 if (NumArgs < NumArgsInProto) 9251 ConvertedArgs.reserve(NumArgsInProto); 9252 else 9253 ConvertedArgs.reserve(NumArgs); 9254 9255 VariadicCallType CallType = 9256 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9257 SmallVector<Expr *, 8> AllArgs; 9258 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9259 Proto, 0, Args, NumArgs, AllArgs, 9260 CallType); 9261 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 9262 ConvertedArgs.push_back(AllArgs[i]); 9263 return Invalid; 9264} 9265 9266static inline bool 9267CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9268 const FunctionDecl *FnDecl) { 9269 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9270 if (isa<NamespaceDecl>(DC)) { 9271 return SemaRef.Diag(FnDecl->getLocation(), 9272 diag::err_operator_new_delete_declared_in_namespace) 9273 << FnDecl->getDeclName(); 9274 } 9275 9276 if (isa<TranslationUnitDecl>(DC) && 9277 FnDecl->getStorageClass() == SC_Static) { 9278 return SemaRef.Diag(FnDecl->getLocation(), 9279 diag::err_operator_new_delete_declared_static) 9280 << FnDecl->getDeclName(); 9281 } 9282 9283 return false; 9284} 9285 9286static inline bool 9287CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9288 CanQualType ExpectedResultType, 9289 CanQualType ExpectedFirstParamType, 9290 unsigned DependentParamTypeDiag, 9291 unsigned InvalidParamTypeDiag) { 9292 QualType ResultType = 9293 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9294 9295 // Check that the result type is not dependent. 9296 if (ResultType->isDependentType()) 9297 return SemaRef.Diag(FnDecl->getLocation(), 9298 diag::err_operator_new_delete_dependent_result_type) 9299 << FnDecl->getDeclName() << ExpectedResultType; 9300 9301 // Check that the result type is what we expect. 9302 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9303 return SemaRef.Diag(FnDecl->getLocation(), 9304 diag::err_operator_new_delete_invalid_result_type) 9305 << FnDecl->getDeclName() << ExpectedResultType; 9306 9307 // A function template must have at least 2 parameters. 9308 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9309 return SemaRef.Diag(FnDecl->getLocation(), 9310 diag::err_operator_new_delete_template_too_few_parameters) 9311 << FnDecl->getDeclName(); 9312 9313 // The function decl must have at least 1 parameter. 9314 if (FnDecl->getNumParams() == 0) 9315 return SemaRef.Diag(FnDecl->getLocation(), 9316 diag::err_operator_new_delete_too_few_parameters) 9317 << FnDecl->getDeclName(); 9318 9319 // Check the the first parameter type is not dependent. 9320 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9321 if (FirstParamType->isDependentType()) 9322 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9323 << FnDecl->getDeclName() << ExpectedFirstParamType; 9324 9325 // Check that the first parameter type is what we expect. 9326 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9327 ExpectedFirstParamType) 9328 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9329 << FnDecl->getDeclName() << ExpectedFirstParamType; 9330 9331 return false; 9332} 9333 9334static bool 9335CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9336 // C++ [basic.stc.dynamic.allocation]p1: 9337 // A program is ill-formed if an allocation function is declared in a 9338 // namespace scope other than global scope or declared static in global 9339 // scope. 9340 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9341 return true; 9342 9343 CanQualType SizeTy = 9344 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9345 9346 // C++ [basic.stc.dynamic.allocation]p1: 9347 // The return type shall be void*. The first parameter shall have type 9348 // std::size_t. 9349 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9350 SizeTy, 9351 diag::err_operator_new_dependent_param_type, 9352 diag::err_operator_new_param_type)) 9353 return true; 9354 9355 // C++ [basic.stc.dynamic.allocation]p1: 9356 // The first parameter shall not have an associated default argument. 9357 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9358 return SemaRef.Diag(FnDecl->getLocation(), 9359 diag::err_operator_new_default_arg) 9360 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9361 9362 return false; 9363} 9364 9365static bool 9366CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9367 // C++ [basic.stc.dynamic.deallocation]p1: 9368 // A program is ill-formed if deallocation functions are declared in a 9369 // namespace scope other than global scope or declared static in global 9370 // scope. 9371 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9372 return true; 9373 9374 // C++ [basic.stc.dynamic.deallocation]p2: 9375 // Each deallocation function shall return void and its first parameter 9376 // shall be void*. 9377 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9378 SemaRef.Context.VoidPtrTy, 9379 diag::err_operator_delete_dependent_param_type, 9380 diag::err_operator_delete_param_type)) 9381 return true; 9382 9383 return false; 9384} 9385 9386/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9387/// of this overloaded operator is well-formed. If so, returns false; 9388/// otherwise, emits appropriate diagnostics and returns true. 9389bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9390 assert(FnDecl && FnDecl->isOverloadedOperator() && 9391 "Expected an overloaded operator declaration"); 9392 9393 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9394 9395 // C++ [over.oper]p5: 9396 // The allocation and deallocation functions, operator new, 9397 // operator new[], operator delete and operator delete[], are 9398 // described completely in 3.7.3. The attributes and restrictions 9399 // found in the rest of this subclause do not apply to them unless 9400 // explicitly stated in 3.7.3. 9401 if (Op == OO_Delete || Op == OO_Array_Delete) 9402 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9403 9404 if (Op == OO_New || Op == OO_Array_New) 9405 return CheckOperatorNewDeclaration(*this, FnDecl); 9406 9407 // C++ [over.oper]p6: 9408 // An operator function shall either be a non-static member 9409 // function or be a non-member function and have at least one 9410 // parameter whose type is a class, a reference to a class, an 9411 // enumeration, or a reference to an enumeration. 9412 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9413 if (MethodDecl->isStatic()) 9414 return Diag(FnDecl->getLocation(), 9415 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9416 } else { 9417 bool ClassOrEnumParam = false; 9418 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9419 ParamEnd = FnDecl->param_end(); 9420 Param != ParamEnd; ++Param) { 9421 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9422 if (ParamType->isDependentType() || ParamType->isRecordType() || 9423 ParamType->isEnumeralType()) { 9424 ClassOrEnumParam = true; 9425 break; 9426 } 9427 } 9428 9429 if (!ClassOrEnumParam) 9430 return Diag(FnDecl->getLocation(), 9431 diag::err_operator_overload_needs_class_or_enum) 9432 << FnDecl->getDeclName(); 9433 } 9434 9435 // C++ [over.oper]p8: 9436 // An operator function cannot have default arguments (8.3.6), 9437 // except where explicitly stated below. 9438 // 9439 // Only the function-call operator allows default arguments 9440 // (C++ [over.call]p1). 9441 if (Op != OO_Call) { 9442 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9443 Param != FnDecl->param_end(); ++Param) { 9444 if ((*Param)->hasDefaultArg()) 9445 return Diag((*Param)->getLocation(), 9446 diag::err_operator_overload_default_arg) 9447 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9448 } 9449 } 9450 9451 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9452 { false, false, false } 9453#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9454 , { Unary, Binary, MemberOnly } 9455#include "clang/Basic/OperatorKinds.def" 9456 }; 9457 9458 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9459 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9460 bool MustBeMemberOperator = OperatorUses[Op][2]; 9461 9462 // C++ [over.oper]p8: 9463 // [...] Operator functions cannot have more or fewer parameters 9464 // than the number required for the corresponding operator, as 9465 // described in the rest of this subclause. 9466 unsigned NumParams = FnDecl->getNumParams() 9467 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9468 if (Op != OO_Call && 9469 ((NumParams == 1 && !CanBeUnaryOperator) || 9470 (NumParams == 2 && !CanBeBinaryOperator) || 9471 (NumParams < 1) || (NumParams > 2))) { 9472 // We have the wrong number of parameters. 9473 unsigned ErrorKind; 9474 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9475 ErrorKind = 2; // 2 -> unary or binary. 9476 } else if (CanBeUnaryOperator) { 9477 ErrorKind = 0; // 0 -> unary 9478 } else { 9479 assert(CanBeBinaryOperator && 9480 "All non-call overloaded operators are unary or binary!"); 9481 ErrorKind = 1; // 1 -> binary 9482 } 9483 9484 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9485 << FnDecl->getDeclName() << NumParams << ErrorKind; 9486 } 9487 9488 // Overloaded operators other than operator() cannot be variadic. 9489 if (Op != OO_Call && 9490 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9491 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9492 << FnDecl->getDeclName(); 9493 } 9494 9495 // Some operators must be non-static member functions. 9496 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9497 return Diag(FnDecl->getLocation(), 9498 diag::err_operator_overload_must_be_member) 9499 << FnDecl->getDeclName(); 9500 } 9501 9502 // C++ [over.inc]p1: 9503 // The user-defined function called operator++ implements the 9504 // prefix and postfix ++ operator. If this function is a member 9505 // function with no parameters, or a non-member function with one 9506 // parameter of class or enumeration type, it defines the prefix 9507 // increment operator ++ for objects of that type. If the function 9508 // is a member function with one parameter (which shall be of type 9509 // int) or a non-member function with two parameters (the second 9510 // of which shall be of type int), it defines the postfix 9511 // increment operator ++ for objects of that type. 9512 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9513 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9514 bool ParamIsInt = false; 9515 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9516 ParamIsInt = BT->getKind() == BuiltinType::Int; 9517 9518 if (!ParamIsInt) 9519 return Diag(LastParam->getLocation(), 9520 diag::err_operator_overload_post_incdec_must_be_int) 9521 << LastParam->getType() << (Op == OO_MinusMinus); 9522 } 9523 9524 return false; 9525} 9526 9527/// CheckLiteralOperatorDeclaration - Check whether the declaration 9528/// of this literal operator function is well-formed. If so, returns 9529/// false; otherwise, emits appropriate diagnostics and returns true. 9530bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9531 DeclContext *DC = FnDecl->getDeclContext(); 9532 Decl::Kind Kind = DC->getDeclKind(); 9533 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 9534 Kind != Decl::LinkageSpec) { 9535 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9536 << FnDecl->getDeclName(); 9537 return true; 9538 } 9539 9540 bool Valid = false; 9541 9542 // template <char...> type operator "" name() is the only valid template 9543 // signature, and the only valid signature with no parameters. 9544 if (FnDecl->param_size() == 0) { 9545 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 9546 // Must have only one template parameter 9547 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9548 if (Params->size() == 1) { 9549 NonTypeTemplateParmDecl *PmDecl = 9550 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9551 9552 // The template parameter must be a char parameter pack. 9553 if (PmDecl && PmDecl->isTemplateParameterPack() && 9554 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9555 Valid = true; 9556 } 9557 } 9558 } else { 9559 // Check the first parameter 9560 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9561 9562 QualType T = (*Param)->getType(); 9563 9564 // unsigned long long int, long double, and any character type are allowed 9565 // as the only parameters. 9566 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9567 Context.hasSameType(T, Context.LongDoubleTy) || 9568 Context.hasSameType(T, Context.CharTy) || 9569 Context.hasSameType(T, Context.WCharTy) || 9570 Context.hasSameType(T, Context.Char16Ty) || 9571 Context.hasSameType(T, Context.Char32Ty)) { 9572 if (++Param == FnDecl->param_end()) 9573 Valid = true; 9574 goto FinishedParams; 9575 } 9576 9577 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9578 const PointerType *PT = T->getAs<PointerType>(); 9579 if (!PT) 9580 goto FinishedParams; 9581 T = PT->getPointeeType(); 9582 if (!T.isConstQualified()) 9583 goto FinishedParams; 9584 T = T.getUnqualifiedType(); 9585 9586 // Move on to the second parameter; 9587 ++Param; 9588 9589 // If there is no second parameter, the first must be a const char * 9590 if (Param == FnDecl->param_end()) { 9591 if (Context.hasSameType(T, Context.CharTy)) 9592 Valid = true; 9593 goto FinishedParams; 9594 } 9595 9596 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9597 // are allowed as the first parameter to a two-parameter function 9598 if (!(Context.hasSameType(T, Context.CharTy) || 9599 Context.hasSameType(T, Context.WCharTy) || 9600 Context.hasSameType(T, Context.Char16Ty) || 9601 Context.hasSameType(T, Context.Char32Ty))) 9602 goto FinishedParams; 9603 9604 // The second and final parameter must be an std::size_t 9605 T = (*Param)->getType().getUnqualifiedType(); 9606 if (Context.hasSameType(T, Context.getSizeType()) && 9607 ++Param == FnDecl->param_end()) 9608 Valid = true; 9609 } 9610 9611 // FIXME: This diagnostic is absolutely terrible. 9612FinishedParams: 9613 if (!Valid) { 9614 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9615 << FnDecl->getDeclName(); 9616 return true; 9617 } 9618 9619 StringRef LiteralName 9620 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9621 if (LiteralName[0] != '_') { 9622 // C++0x [usrlit.suffix]p1: 9623 // Literal suffix identifiers that do not start with an underscore are 9624 // reserved for future standardization. 9625 bool IsHexFloat = true; 9626 if (LiteralName.size() > 1 && 9627 (LiteralName[0] == 'P' || LiteralName[0] == 'p')) { 9628 for (unsigned I = 1, N = LiteralName.size(); I < N; ++I) { 9629 if (!isdigit(LiteralName[I])) { 9630 IsHexFloat = false; 9631 break; 9632 } 9633 } 9634 } 9635 9636 if (IsHexFloat) 9637 Diag(FnDecl->getLocation(), diag::warn_user_literal_hexfloat) 9638 << LiteralName; 9639 else 9640 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9641 } 9642 9643 return false; 9644} 9645 9646/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9647/// linkage specification, including the language and (if present) 9648/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9649/// the location of the language string literal, which is provided 9650/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9651/// the '{' brace. Otherwise, this linkage specification does not 9652/// have any braces. 9653Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9654 SourceLocation LangLoc, 9655 StringRef Lang, 9656 SourceLocation LBraceLoc) { 9657 LinkageSpecDecl::LanguageIDs Language; 9658 if (Lang == "\"C\"") 9659 Language = LinkageSpecDecl::lang_c; 9660 else if (Lang == "\"C++\"") 9661 Language = LinkageSpecDecl::lang_cxx; 9662 else { 9663 Diag(LangLoc, diag::err_bad_language); 9664 return 0; 9665 } 9666 9667 // FIXME: Add all the various semantics of linkage specifications 9668 9669 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9670 ExternLoc, LangLoc, Language); 9671 CurContext->addDecl(D); 9672 PushDeclContext(S, D); 9673 return D; 9674} 9675 9676/// ActOnFinishLinkageSpecification - Complete the definition of 9677/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9678/// valid, it's the position of the closing '}' brace in a linkage 9679/// specification that uses braces. 9680Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9681 Decl *LinkageSpec, 9682 SourceLocation RBraceLoc) { 9683 if (LinkageSpec) { 9684 if (RBraceLoc.isValid()) { 9685 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9686 LSDecl->setRBraceLoc(RBraceLoc); 9687 } 9688 PopDeclContext(); 9689 } 9690 return LinkageSpec; 9691} 9692 9693/// \brief Perform semantic analysis for the variable declaration that 9694/// occurs within a C++ catch clause, returning the newly-created 9695/// variable. 9696VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9697 TypeSourceInfo *TInfo, 9698 SourceLocation StartLoc, 9699 SourceLocation Loc, 9700 IdentifierInfo *Name) { 9701 bool Invalid = false; 9702 QualType ExDeclType = TInfo->getType(); 9703 9704 // Arrays and functions decay. 9705 if (ExDeclType->isArrayType()) 9706 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9707 else if (ExDeclType->isFunctionType()) 9708 ExDeclType = Context.getPointerType(ExDeclType); 9709 9710 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9711 // The exception-declaration shall not denote a pointer or reference to an 9712 // incomplete type, other than [cv] void*. 9713 // N2844 forbids rvalue references. 9714 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9715 Diag(Loc, diag::err_catch_rvalue_ref); 9716 Invalid = true; 9717 } 9718 9719 // GCC allows catching pointers and references to incomplete types 9720 // as an extension; so do we, but we warn by default. 9721 9722 QualType BaseType = ExDeclType; 9723 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9724 unsigned DK = diag::err_catch_incomplete; 9725 bool IncompleteCatchIsInvalid = true; 9726 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9727 BaseType = Ptr->getPointeeType(); 9728 Mode = 1; 9729 DK = diag::ext_catch_incomplete_ptr; 9730 IncompleteCatchIsInvalid = false; 9731 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9732 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9733 BaseType = Ref->getPointeeType(); 9734 Mode = 2; 9735 DK = diag::ext_catch_incomplete_ref; 9736 IncompleteCatchIsInvalid = false; 9737 } 9738 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9739 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 9740 IncompleteCatchIsInvalid) 9741 Invalid = true; 9742 9743 if (!Invalid && !ExDeclType->isDependentType() && 9744 RequireNonAbstractType(Loc, ExDeclType, 9745 diag::err_abstract_type_in_decl, 9746 AbstractVariableType)) 9747 Invalid = true; 9748 9749 // Only the non-fragile NeXT runtime currently supports C++ catches 9750 // of ObjC types, and no runtime supports catching ObjC types by value. 9751 if (!Invalid && getLangOptions().ObjC1) { 9752 QualType T = ExDeclType; 9753 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9754 T = RT->getPointeeType(); 9755 9756 if (T->isObjCObjectType()) { 9757 Diag(Loc, diag::err_objc_object_catch); 9758 Invalid = true; 9759 } else if (T->isObjCObjectPointerType()) { 9760 if (!getLangOptions().ObjCNonFragileABI) 9761 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9762 } 9763 } 9764 9765 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9766 ExDeclType, TInfo, SC_None, SC_None); 9767 ExDecl->setExceptionVariable(true); 9768 9769 if (!Invalid && !ExDeclType->isDependentType()) { 9770 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9771 // C++ [except.handle]p16: 9772 // The object declared in an exception-declaration or, if the 9773 // exception-declaration does not specify a name, a temporary (12.2) is 9774 // copy-initialized (8.5) from the exception object. [...] 9775 // The object is destroyed when the handler exits, after the destruction 9776 // of any automatic objects initialized within the handler. 9777 // 9778 // We just pretend to initialize the object with itself, then make sure 9779 // it can be destroyed later. 9780 QualType initType = ExDeclType; 9781 9782 InitializedEntity entity = 9783 InitializedEntity::InitializeVariable(ExDecl); 9784 InitializationKind initKind = 9785 InitializationKind::CreateCopy(Loc, SourceLocation()); 9786 9787 Expr *opaqueValue = 9788 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9789 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9790 ExprResult result = sequence.Perform(*this, entity, initKind, 9791 MultiExprArg(&opaqueValue, 1)); 9792 if (result.isInvalid()) 9793 Invalid = true; 9794 else { 9795 // If the constructor used was non-trivial, set this as the 9796 // "initializer". 9797 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9798 if (!construct->getConstructor()->isTrivial()) { 9799 Expr *init = MaybeCreateExprWithCleanups(construct); 9800 ExDecl->setInit(init); 9801 } 9802 9803 // And make sure it's destructable. 9804 FinalizeVarWithDestructor(ExDecl, recordType); 9805 } 9806 } 9807 } 9808 9809 if (Invalid) 9810 ExDecl->setInvalidDecl(); 9811 9812 return ExDecl; 9813} 9814 9815/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9816/// handler. 9817Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9818 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9819 bool Invalid = D.isInvalidType(); 9820 9821 // Check for unexpanded parameter packs. 9822 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9823 UPPC_ExceptionType)) { 9824 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9825 D.getIdentifierLoc()); 9826 Invalid = true; 9827 } 9828 9829 IdentifierInfo *II = D.getIdentifier(); 9830 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9831 LookupOrdinaryName, 9832 ForRedeclaration)) { 9833 // The scope should be freshly made just for us. There is just no way 9834 // it contains any previous declaration. 9835 assert(!S->isDeclScope(PrevDecl)); 9836 if (PrevDecl->isTemplateParameter()) { 9837 // Maybe we will complain about the shadowed template parameter. 9838 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9839 } 9840 } 9841 9842 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9843 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9844 << D.getCXXScopeSpec().getRange(); 9845 Invalid = true; 9846 } 9847 9848 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9849 D.getSourceRange().getBegin(), 9850 D.getIdentifierLoc(), 9851 D.getIdentifier()); 9852 if (Invalid) 9853 ExDecl->setInvalidDecl(); 9854 9855 // Add the exception declaration into this scope. 9856 if (II) 9857 PushOnScopeChains(ExDecl, S); 9858 else 9859 CurContext->addDecl(ExDecl); 9860 9861 ProcessDeclAttributes(S, ExDecl, D); 9862 return ExDecl; 9863} 9864 9865Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9866 Expr *AssertExpr, 9867 Expr *AssertMessageExpr_, 9868 SourceLocation RParenLoc) { 9869 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9870 9871 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9872 llvm::APSInt Value(32); 9873 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 9874 Diag(StaticAssertLoc, 9875 diag::err_static_assert_expression_is_not_constant) << 9876 AssertExpr->getSourceRange(); 9877 return 0; 9878 } 9879 9880 if (Value == 0) { 9881 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9882 << AssertMessage->getString() << AssertExpr->getSourceRange(); 9883 } 9884 } 9885 9886 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9887 return 0; 9888 9889 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9890 AssertExpr, AssertMessage, RParenLoc); 9891 9892 CurContext->addDecl(Decl); 9893 return Decl; 9894} 9895 9896/// \brief Perform semantic analysis of the given friend type declaration. 9897/// 9898/// \returns A friend declaration that. 9899FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 9900 TypeSourceInfo *TSInfo) { 9901 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9902 9903 QualType T = TSInfo->getType(); 9904 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9905 9906 if (!getLangOptions().CPlusPlus0x) { 9907 // C++03 [class.friend]p2: 9908 // An elaborated-type-specifier shall be used in a friend declaration 9909 // for a class.* 9910 // 9911 // * The class-key of the elaborated-type-specifier is required. 9912 if (!ActiveTemplateInstantiations.empty()) { 9913 // Do not complain about the form of friend template types during 9914 // template instantiation; we will already have complained when the 9915 // template was declared. 9916 } else if (!T->isElaboratedTypeSpecifier()) { 9917 // If we evaluated the type to a record type, suggest putting 9918 // a tag in front. 9919 if (const RecordType *RT = T->getAs<RecordType>()) { 9920 RecordDecl *RD = RT->getDecl(); 9921 9922 std::string InsertionText = std::string(" ") + RD->getKindName(); 9923 9924 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 9925 << (unsigned) RD->getTagKind() 9926 << T 9927 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9928 InsertionText); 9929 } else { 9930 Diag(FriendLoc, diag::ext_nonclass_type_friend) 9931 << T 9932 << SourceRange(FriendLoc, TypeRange.getEnd()); 9933 } 9934 } else if (T->getAs<EnumType>()) { 9935 Diag(FriendLoc, diag::ext_enum_friend) 9936 << T 9937 << SourceRange(FriendLoc, TypeRange.getEnd()); 9938 } 9939 } 9940 9941 // C++0x [class.friend]p3: 9942 // If the type specifier in a friend declaration designates a (possibly 9943 // cv-qualified) class type, that class is declared as a friend; otherwise, 9944 // the friend declaration is ignored. 9945 9946 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9947 // in [class.friend]p3 that we do not implement. 9948 9949 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 9950} 9951 9952/// Handle a friend tag declaration where the scope specifier was 9953/// templated. 9954Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9955 unsigned TagSpec, SourceLocation TagLoc, 9956 CXXScopeSpec &SS, 9957 IdentifierInfo *Name, SourceLocation NameLoc, 9958 AttributeList *Attr, 9959 MultiTemplateParamsArg TempParamLists) { 9960 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9961 9962 bool isExplicitSpecialization = false; 9963 bool Invalid = false; 9964 9965 if (TemplateParameterList *TemplateParams 9966 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9967 TempParamLists.get(), 9968 TempParamLists.size(), 9969 /*friend*/ true, 9970 isExplicitSpecialization, 9971 Invalid)) { 9972 if (TemplateParams->size() > 0) { 9973 // This is a declaration of a class template. 9974 if (Invalid) 9975 return 0; 9976 9977 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9978 SS, Name, NameLoc, Attr, 9979 TemplateParams, AS_public, 9980 /*ModulePrivateLoc=*/SourceLocation(), 9981 TempParamLists.size() - 1, 9982 (TemplateParameterList**) TempParamLists.release()).take(); 9983 } else { 9984 // The "template<>" header is extraneous. 9985 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9986 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9987 isExplicitSpecialization = true; 9988 } 9989 } 9990 9991 if (Invalid) return 0; 9992 9993 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9994 9995 bool isAllExplicitSpecializations = true; 9996 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9997 if (TempParamLists.get()[I]->size()) { 9998 isAllExplicitSpecializations = false; 9999 break; 10000 } 10001 } 10002 10003 // FIXME: don't ignore attributes. 10004 10005 // If it's explicit specializations all the way down, just forget 10006 // about the template header and build an appropriate non-templated 10007 // friend. TODO: for source fidelity, remember the headers. 10008 if (isAllExplicitSpecializations) { 10009 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 10010 ElaboratedTypeKeyword Keyword 10011 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10012 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 10013 *Name, NameLoc); 10014 if (T.isNull()) 10015 return 0; 10016 10017 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10018 if (isa<DependentNameType>(T)) { 10019 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10020 TL.setKeywordLoc(TagLoc); 10021 TL.setQualifierLoc(QualifierLoc); 10022 TL.setNameLoc(NameLoc); 10023 } else { 10024 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 10025 TL.setKeywordLoc(TagLoc); 10026 TL.setQualifierLoc(QualifierLoc); 10027 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 10028 } 10029 10030 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10031 TSI, FriendLoc); 10032 Friend->setAccess(AS_public); 10033 CurContext->addDecl(Friend); 10034 return Friend; 10035 } 10036 10037 // Handle the case of a templated-scope friend class. e.g. 10038 // template <class T> class A<T>::B; 10039 // FIXME: we don't support these right now. 10040 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10041 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 10042 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10043 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10044 TL.setKeywordLoc(TagLoc); 10045 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 10046 TL.setNameLoc(NameLoc); 10047 10048 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10049 TSI, FriendLoc); 10050 Friend->setAccess(AS_public); 10051 Friend->setUnsupportedFriend(true); 10052 CurContext->addDecl(Friend); 10053 return Friend; 10054} 10055 10056 10057/// Handle a friend type declaration. This works in tandem with 10058/// ActOnTag. 10059/// 10060/// Notes on friend class templates: 10061/// 10062/// We generally treat friend class declarations as if they were 10063/// declaring a class. So, for example, the elaborated type specifier 10064/// in a friend declaration is required to obey the restrictions of a 10065/// class-head (i.e. no typedefs in the scope chain), template 10066/// parameters are required to match up with simple template-ids, &c. 10067/// However, unlike when declaring a template specialization, it's 10068/// okay to refer to a template specialization without an empty 10069/// template parameter declaration, e.g. 10070/// friend class A<T>::B<unsigned>; 10071/// We permit this as a special case; if there are any template 10072/// parameters present at all, require proper matching, i.e. 10073/// template <> template <class T> friend class A<int>::B; 10074Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 10075 MultiTemplateParamsArg TempParams) { 10076 SourceLocation Loc = DS.getSourceRange().getBegin(); 10077 10078 assert(DS.isFriendSpecified()); 10079 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10080 10081 // Try to convert the decl specifier to a type. This works for 10082 // friend templates because ActOnTag never produces a ClassTemplateDecl 10083 // for a TUK_Friend. 10084 Declarator TheDeclarator(DS, Declarator::MemberContext); 10085 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 10086 QualType T = TSI->getType(); 10087 if (TheDeclarator.isInvalidType()) 10088 return 0; 10089 10090 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 10091 return 0; 10092 10093 // This is definitely an error in C++98. It's probably meant to 10094 // be forbidden in C++0x, too, but the specification is just 10095 // poorly written. 10096 // 10097 // The problem is with declarations like the following: 10098 // template <T> friend A<T>::foo; 10099 // where deciding whether a class C is a friend or not now hinges 10100 // on whether there exists an instantiation of A that causes 10101 // 'foo' to equal C. There are restrictions on class-heads 10102 // (which we declare (by fiat) elaborated friend declarations to 10103 // be) that makes this tractable. 10104 // 10105 // FIXME: handle "template <> friend class A<T>;", which 10106 // is possibly well-formed? Who even knows? 10107 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 10108 Diag(Loc, diag::err_tagless_friend_type_template) 10109 << DS.getSourceRange(); 10110 return 0; 10111 } 10112 10113 // C++98 [class.friend]p1: A friend of a class is a function 10114 // or class that is not a member of the class . . . 10115 // This is fixed in DR77, which just barely didn't make the C++03 10116 // deadline. It's also a very silly restriction that seriously 10117 // affects inner classes and which nobody else seems to implement; 10118 // thus we never diagnose it, not even in -pedantic. 10119 // 10120 // But note that we could warn about it: it's always useless to 10121 // friend one of your own members (it's not, however, worthless to 10122 // friend a member of an arbitrary specialization of your template). 10123 10124 Decl *D; 10125 if (unsigned NumTempParamLists = TempParams.size()) 10126 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10127 NumTempParamLists, 10128 TempParams.release(), 10129 TSI, 10130 DS.getFriendSpecLoc()); 10131 else 10132 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 10133 10134 if (!D) 10135 return 0; 10136 10137 D->setAccess(AS_public); 10138 CurContext->addDecl(D); 10139 10140 return D; 10141} 10142 10143Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 10144 MultiTemplateParamsArg TemplateParams) { 10145 const DeclSpec &DS = D.getDeclSpec(); 10146 10147 assert(DS.isFriendSpecified()); 10148 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10149 10150 SourceLocation Loc = D.getIdentifierLoc(); 10151 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10152 QualType T = TInfo->getType(); 10153 10154 // C++ [class.friend]p1 10155 // A friend of a class is a function or class.... 10156 // Note that this sees through typedefs, which is intended. 10157 // It *doesn't* see through dependent types, which is correct 10158 // according to [temp.arg.type]p3: 10159 // If a declaration acquires a function type through a 10160 // type dependent on a template-parameter and this causes 10161 // a declaration that does not use the syntactic form of a 10162 // function declarator to have a function type, the program 10163 // is ill-formed. 10164 if (!T->isFunctionType()) { 10165 Diag(Loc, diag::err_unexpected_friend); 10166 10167 // It might be worthwhile to try to recover by creating an 10168 // appropriate declaration. 10169 return 0; 10170 } 10171 10172 // C++ [namespace.memdef]p3 10173 // - If a friend declaration in a non-local class first declares a 10174 // class or function, the friend class or function is a member 10175 // of the innermost enclosing namespace. 10176 // - The name of the friend is not found by simple name lookup 10177 // until a matching declaration is provided in that namespace 10178 // scope (either before or after the class declaration granting 10179 // friendship). 10180 // - If a friend function is called, its name may be found by the 10181 // name lookup that considers functions from namespaces and 10182 // classes associated with the types of the function arguments. 10183 // - When looking for a prior declaration of a class or a function 10184 // declared as a friend, scopes outside the innermost enclosing 10185 // namespace scope are not considered. 10186 10187 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10188 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10189 DeclarationName Name = NameInfo.getName(); 10190 assert(Name); 10191 10192 // Check for unexpanded parameter packs. 10193 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10194 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10195 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10196 return 0; 10197 10198 // The context we found the declaration in, or in which we should 10199 // create the declaration. 10200 DeclContext *DC; 10201 Scope *DCScope = S; 10202 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10203 ForRedeclaration); 10204 10205 // FIXME: there are different rules in local classes 10206 10207 // There are four cases here. 10208 // - There's no scope specifier, in which case we just go to the 10209 // appropriate scope and look for a function or function template 10210 // there as appropriate. 10211 // Recover from invalid scope qualifiers as if they just weren't there. 10212 if (SS.isInvalid() || !SS.isSet()) { 10213 // C++0x [namespace.memdef]p3: 10214 // If the name in a friend declaration is neither qualified nor 10215 // a template-id and the declaration is a function or an 10216 // elaborated-type-specifier, the lookup to determine whether 10217 // the entity has been previously declared shall not consider 10218 // any scopes outside the innermost enclosing namespace. 10219 // C++0x [class.friend]p11: 10220 // If a friend declaration appears in a local class and the name 10221 // specified is an unqualified name, a prior declaration is 10222 // looked up without considering scopes that are outside the 10223 // innermost enclosing non-class scope. For a friend function 10224 // declaration, if there is no prior declaration, the program is 10225 // ill-formed. 10226 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10227 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10228 10229 // Find the appropriate context according to the above. 10230 DC = CurContext; 10231 while (true) { 10232 // Skip class contexts. If someone can cite chapter and verse 10233 // for this behavior, that would be nice --- it's what GCC and 10234 // EDG do, and it seems like a reasonable intent, but the spec 10235 // really only says that checks for unqualified existing 10236 // declarations should stop at the nearest enclosing namespace, 10237 // not that they should only consider the nearest enclosing 10238 // namespace. 10239 while (DC->isRecord()) 10240 DC = DC->getParent(); 10241 10242 LookupQualifiedName(Previous, DC); 10243 10244 // TODO: decide what we think about using declarations. 10245 if (isLocal || !Previous.empty()) 10246 break; 10247 10248 if (isTemplateId) { 10249 if (isa<TranslationUnitDecl>(DC)) break; 10250 } else { 10251 if (DC->isFileContext()) break; 10252 } 10253 DC = DC->getParent(); 10254 } 10255 10256 // C++ [class.friend]p1: A friend of a class is a function or 10257 // class that is not a member of the class . . . 10258 // C++0x changes this for both friend types and functions. 10259 // Most C++ 98 compilers do seem to give an error here, so 10260 // we do, too. 10261 if (!Previous.empty() && DC->Equals(CurContext) 10262 && !getLangOptions().CPlusPlus0x) 10263 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 10264 10265 DCScope = getScopeForDeclContext(S, DC); 10266 10267 // C++ [class.friend]p6: 10268 // A function can be defined in a friend declaration of a class if and 10269 // only if the class is a non-local class (9.8), the function name is 10270 // unqualified, and the function has namespace scope. 10271 if (isLocal && IsDefinition) { 10272 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10273 } 10274 10275 // - There's a non-dependent scope specifier, in which case we 10276 // compute it and do a previous lookup there for a function 10277 // or function template. 10278 } else if (!SS.getScopeRep()->isDependent()) { 10279 DC = computeDeclContext(SS); 10280 if (!DC) return 0; 10281 10282 if (RequireCompleteDeclContext(SS, DC)) return 0; 10283 10284 LookupQualifiedName(Previous, DC); 10285 10286 // Ignore things found implicitly in the wrong scope. 10287 // TODO: better diagnostics for this case. Suggesting the right 10288 // qualified scope would be nice... 10289 LookupResult::Filter F = Previous.makeFilter(); 10290 while (F.hasNext()) { 10291 NamedDecl *D = F.next(); 10292 if (!DC->InEnclosingNamespaceSetOf( 10293 D->getDeclContext()->getRedeclContext())) 10294 F.erase(); 10295 } 10296 F.done(); 10297 10298 if (Previous.empty()) { 10299 D.setInvalidType(); 10300 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 10301 return 0; 10302 } 10303 10304 // C++ [class.friend]p1: A friend of a class is a function or 10305 // class that is not a member of the class . . . 10306 if (DC->Equals(CurContext)) 10307 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 10308 10309 if (IsDefinition) { 10310 // C++ [class.friend]p6: 10311 // A function can be defined in a friend declaration of a class if and 10312 // only if the class is a non-local class (9.8), the function name is 10313 // unqualified, and the function has namespace scope. 10314 SemaDiagnosticBuilder DB 10315 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10316 10317 DB << SS.getScopeRep(); 10318 if (DC->isFileContext()) 10319 DB << FixItHint::CreateRemoval(SS.getRange()); 10320 SS.clear(); 10321 } 10322 10323 // - There's a scope specifier that does not match any template 10324 // parameter lists, in which case we use some arbitrary context, 10325 // create a method or method template, and wait for instantiation. 10326 // - There's a scope specifier that does match some template 10327 // parameter lists, which we don't handle right now. 10328 } else { 10329 if (IsDefinition) { 10330 // C++ [class.friend]p6: 10331 // A function can be defined in a friend declaration of a class if and 10332 // only if the class is a non-local class (9.8), the function name is 10333 // unqualified, and the function has namespace scope. 10334 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10335 << SS.getScopeRep(); 10336 } 10337 10338 DC = CurContext; 10339 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10340 } 10341 10342 if (!DC->isRecord()) { 10343 // This implies that it has to be an operator or function. 10344 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10345 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10346 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10347 Diag(Loc, diag::err_introducing_special_friend) << 10348 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10349 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10350 return 0; 10351 } 10352 } 10353 10354 bool Redeclaration = false; 10355 bool AddToScope = true; 10356 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 10357 move(TemplateParams), 10358 IsDefinition, 10359 Redeclaration, AddToScope); 10360 if (!ND) return 0; 10361 10362 assert(ND->getDeclContext() == DC); 10363 assert(ND->getLexicalDeclContext() == CurContext); 10364 10365 // Add the function declaration to the appropriate lookup tables, 10366 // adjusting the redeclarations list as necessary. We don't 10367 // want to do this yet if the friending class is dependent. 10368 // 10369 // Also update the scope-based lookup if the target context's 10370 // lookup context is in lexical scope. 10371 if (!CurContext->isDependentContext()) { 10372 DC = DC->getRedeclContext(); 10373 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 10374 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10375 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10376 } 10377 10378 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10379 D.getIdentifierLoc(), ND, 10380 DS.getFriendSpecLoc()); 10381 FrD->setAccess(AS_public); 10382 CurContext->addDecl(FrD); 10383 10384 if (ND->isInvalidDecl()) 10385 FrD->setInvalidDecl(); 10386 else { 10387 FunctionDecl *FD; 10388 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10389 FD = FTD->getTemplatedDecl(); 10390 else 10391 FD = cast<FunctionDecl>(ND); 10392 10393 // Mark templated-scope function declarations as unsupported. 10394 if (FD->getNumTemplateParameterLists()) 10395 FrD->setUnsupportedFriend(true); 10396 } 10397 10398 return ND; 10399} 10400 10401void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10402 AdjustDeclIfTemplate(Dcl); 10403 10404 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10405 if (!Fn) { 10406 Diag(DelLoc, diag::err_deleted_non_function); 10407 return; 10408 } 10409 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 10410 Diag(DelLoc, diag::err_deleted_decl_not_first); 10411 Diag(Prev->getLocation(), diag::note_previous_declaration); 10412 // If the declaration wasn't the first, we delete the function anyway for 10413 // recovery. 10414 } 10415 Fn->setDeletedAsWritten(); 10416} 10417 10418void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10419 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10420 10421 if (MD) { 10422 if (MD->getParent()->isDependentType()) { 10423 MD->setDefaulted(); 10424 MD->setExplicitlyDefaulted(); 10425 return; 10426 } 10427 10428 CXXSpecialMember Member = getSpecialMember(MD); 10429 if (Member == CXXInvalid) { 10430 Diag(DefaultLoc, diag::err_default_special_members); 10431 return; 10432 } 10433 10434 MD->setDefaulted(); 10435 MD->setExplicitlyDefaulted(); 10436 10437 // If this definition appears within the record, do the checking when 10438 // the record is complete. 10439 const FunctionDecl *Primary = MD; 10440 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10441 // Find the uninstantiated declaration that actually had the '= default' 10442 // on it. 10443 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10444 10445 if (Primary == Primary->getCanonicalDecl()) 10446 return; 10447 10448 switch (Member) { 10449 case CXXDefaultConstructor: { 10450 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10451 CheckExplicitlyDefaultedDefaultConstructor(CD); 10452 if (!CD->isInvalidDecl()) 10453 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10454 break; 10455 } 10456 10457 case CXXCopyConstructor: { 10458 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10459 CheckExplicitlyDefaultedCopyConstructor(CD); 10460 if (!CD->isInvalidDecl()) 10461 DefineImplicitCopyConstructor(DefaultLoc, CD); 10462 break; 10463 } 10464 10465 case CXXCopyAssignment: { 10466 CheckExplicitlyDefaultedCopyAssignment(MD); 10467 if (!MD->isInvalidDecl()) 10468 DefineImplicitCopyAssignment(DefaultLoc, MD); 10469 break; 10470 } 10471 10472 case CXXDestructor: { 10473 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10474 CheckExplicitlyDefaultedDestructor(DD); 10475 if (!DD->isInvalidDecl()) 10476 DefineImplicitDestructor(DefaultLoc, DD); 10477 break; 10478 } 10479 10480 case CXXMoveConstructor: { 10481 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10482 CheckExplicitlyDefaultedMoveConstructor(CD); 10483 if (!CD->isInvalidDecl()) 10484 DefineImplicitMoveConstructor(DefaultLoc, CD); 10485 break; 10486 } 10487 10488 case CXXMoveAssignment: { 10489 CheckExplicitlyDefaultedMoveAssignment(MD); 10490 if (!MD->isInvalidDecl()) 10491 DefineImplicitMoveAssignment(DefaultLoc, MD); 10492 break; 10493 } 10494 10495 case CXXInvalid: 10496 llvm_unreachable("Invalid special member."); 10497 } 10498 } else { 10499 Diag(DefaultLoc, diag::err_default_special_members); 10500 } 10501} 10502 10503static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10504 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10505 Stmt *SubStmt = *CI; 10506 if (!SubStmt) 10507 continue; 10508 if (isa<ReturnStmt>(SubStmt)) 10509 Self.Diag(SubStmt->getSourceRange().getBegin(), 10510 diag::err_return_in_constructor_handler); 10511 if (!isa<Expr>(SubStmt)) 10512 SearchForReturnInStmt(Self, SubStmt); 10513 } 10514} 10515 10516void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10517 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10518 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10519 SearchForReturnInStmt(*this, Handler); 10520 } 10521} 10522 10523bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10524 const CXXMethodDecl *Old) { 10525 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10526 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10527 10528 if (Context.hasSameType(NewTy, OldTy) || 10529 NewTy->isDependentType() || OldTy->isDependentType()) 10530 return false; 10531 10532 // Check if the return types are covariant 10533 QualType NewClassTy, OldClassTy; 10534 10535 /// Both types must be pointers or references to classes. 10536 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10537 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10538 NewClassTy = NewPT->getPointeeType(); 10539 OldClassTy = OldPT->getPointeeType(); 10540 } 10541 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10542 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10543 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10544 NewClassTy = NewRT->getPointeeType(); 10545 OldClassTy = OldRT->getPointeeType(); 10546 } 10547 } 10548 } 10549 10550 // The return types aren't either both pointers or references to a class type. 10551 if (NewClassTy.isNull()) { 10552 Diag(New->getLocation(), 10553 diag::err_different_return_type_for_overriding_virtual_function) 10554 << New->getDeclName() << NewTy << OldTy; 10555 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10556 10557 return true; 10558 } 10559 10560 // C++ [class.virtual]p6: 10561 // If the return type of D::f differs from the return type of B::f, the 10562 // class type in the return type of D::f shall be complete at the point of 10563 // declaration of D::f or shall be the class type D. 10564 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10565 if (!RT->isBeingDefined() && 10566 RequireCompleteType(New->getLocation(), NewClassTy, 10567 PDiag(diag::err_covariant_return_incomplete) 10568 << New->getDeclName())) 10569 return true; 10570 } 10571 10572 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10573 // Check if the new class derives from the old class. 10574 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10575 Diag(New->getLocation(), 10576 diag::err_covariant_return_not_derived) 10577 << New->getDeclName() << NewTy << OldTy; 10578 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10579 return true; 10580 } 10581 10582 // Check if we the conversion from derived to base is valid. 10583 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10584 diag::err_covariant_return_inaccessible_base, 10585 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10586 // FIXME: Should this point to the return type? 10587 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10588 // FIXME: this note won't trigger for delayed access control 10589 // diagnostics, and it's impossible to get an undelayed error 10590 // here from access control during the original parse because 10591 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10592 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10593 return true; 10594 } 10595 } 10596 10597 // The qualifiers of the return types must be the same. 10598 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10599 Diag(New->getLocation(), 10600 diag::err_covariant_return_type_different_qualifications) 10601 << New->getDeclName() << NewTy << OldTy; 10602 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10603 return true; 10604 }; 10605 10606 10607 // The new class type must have the same or less qualifiers as the old type. 10608 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10609 Diag(New->getLocation(), 10610 diag::err_covariant_return_type_class_type_more_qualified) 10611 << New->getDeclName() << NewTy << OldTy; 10612 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10613 return true; 10614 }; 10615 10616 return false; 10617} 10618 10619/// \brief Mark the given method pure. 10620/// 10621/// \param Method the method to be marked pure. 10622/// 10623/// \param InitRange the source range that covers the "0" initializer. 10624bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10625 SourceLocation EndLoc = InitRange.getEnd(); 10626 if (EndLoc.isValid()) 10627 Method->setRangeEnd(EndLoc); 10628 10629 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10630 Method->setPure(); 10631 return false; 10632 } 10633 10634 if (!Method->isInvalidDecl()) 10635 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10636 << Method->getDeclName() << InitRange; 10637 return true; 10638} 10639 10640/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10641/// an initializer for the out-of-line declaration 'Dcl'. The scope 10642/// is a fresh scope pushed for just this purpose. 10643/// 10644/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10645/// static data member of class X, names should be looked up in the scope of 10646/// class X. 10647void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10648 // If there is no declaration, there was an error parsing it. 10649 if (D == 0 || D->isInvalidDecl()) return; 10650 10651 // We should only get called for declarations with scope specifiers, like: 10652 // int foo::bar; 10653 assert(D->isOutOfLine()); 10654 EnterDeclaratorContext(S, D->getDeclContext()); 10655} 10656 10657/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10658/// initializer for the out-of-line declaration 'D'. 10659void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10660 // If there is no declaration, there was an error parsing it. 10661 if (D == 0 || D->isInvalidDecl()) return; 10662 10663 assert(D->isOutOfLine()); 10664 ExitDeclaratorContext(S); 10665} 10666 10667/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10668/// C++ if/switch/while/for statement. 10669/// e.g: "if (int x = f()) {...}" 10670DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10671 // C++ 6.4p2: 10672 // The declarator shall not specify a function or an array. 10673 // The type-specifier-seq shall not contain typedef and shall not declare a 10674 // new class or enumeration. 10675 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10676 "Parser allowed 'typedef' as storage class of condition decl."); 10677 10678 Decl *Dcl = ActOnDeclarator(S, D); 10679 if (!Dcl) 10680 return true; 10681 10682 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10683 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10684 << D.getSourceRange(); 10685 return true; 10686 } 10687 10688 return Dcl; 10689} 10690 10691void Sema::LoadExternalVTableUses() { 10692 if (!ExternalSource) 10693 return; 10694 10695 SmallVector<ExternalVTableUse, 4> VTables; 10696 ExternalSource->ReadUsedVTables(VTables); 10697 SmallVector<VTableUse, 4> NewUses; 10698 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10699 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10700 = VTablesUsed.find(VTables[I].Record); 10701 // Even if a definition wasn't required before, it may be required now. 10702 if (Pos != VTablesUsed.end()) { 10703 if (!Pos->second && VTables[I].DefinitionRequired) 10704 Pos->second = true; 10705 continue; 10706 } 10707 10708 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10709 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10710 } 10711 10712 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10713} 10714 10715void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10716 bool DefinitionRequired) { 10717 // Ignore any vtable uses in unevaluated operands or for classes that do 10718 // not have a vtable. 10719 if (!Class->isDynamicClass() || Class->isDependentContext() || 10720 CurContext->isDependentContext() || 10721 ExprEvalContexts.back().Context == Unevaluated) 10722 return; 10723 10724 // Try to insert this class into the map. 10725 LoadExternalVTableUses(); 10726 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10727 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10728 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10729 if (!Pos.second) { 10730 // If we already had an entry, check to see if we are promoting this vtable 10731 // to required a definition. If so, we need to reappend to the VTableUses 10732 // list, since we may have already processed the first entry. 10733 if (DefinitionRequired && !Pos.first->second) { 10734 Pos.first->second = true; 10735 } else { 10736 // Otherwise, we can early exit. 10737 return; 10738 } 10739 } 10740 10741 // Local classes need to have their virtual members marked 10742 // immediately. For all other classes, we mark their virtual members 10743 // at the end of the translation unit. 10744 if (Class->isLocalClass()) 10745 MarkVirtualMembersReferenced(Loc, Class); 10746 else 10747 VTableUses.push_back(std::make_pair(Class, Loc)); 10748} 10749 10750bool Sema::DefineUsedVTables() { 10751 LoadExternalVTableUses(); 10752 if (VTableUses.empty()) 10753 return false; 10754 10755 // Note: The VTableUses vector could grow as a result of marking 10756 // the members of a class as "used", so we check the size each 10757 // time through the loop and prefer indices (with are stable) to 10758 // iterators (which are not). 10759 bool DefinedAnything = false; 10760 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10761 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10762 if (!Class) 10763 continue; 10764 10765 SourceLocation Loc = VTableUses[I].second; 10766 10767 // If this class has a key function, but that key function is 10768 // defined in another translation unit, we don't need to emit the 10769 // vtable even though we're using it. 10770 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10771 if (KeyFunction && !KeyFunction->hasBody()) { 10772 switch (KeyFunction->getTemplateSpecializationKind()) { 10773 case TSK_Undeclared: 10774 case TSK_ExplicitSpecialization: 10775 case TSK_ExplicitInstantiationDeclaration: 10776 // The key function is in another translation unit. 10777 continue; 10778 10779 case TSK_ExplicitInstantiationDefinition: 10780 case TSK_ImplicitInstantiation: 10781 // We will be instantiating the key function. 10782 break; 10783 } 10784 } else if (!KeyFunction) { 10785 // If we have a class with no key function that is the subject 10786 // of an explicit instantiation declaration, suppress the 10787 // vtable; it will live with the explicit instantiation 10788 // definition. 10789 bool IsExplicitInstantiationDeclaration 10790 = Class->getTemplateSpecializationKind() 10791 == TSK_ExplicitInstantiationDeclaration; 10792 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10793 REnd = Class->redecls_end(); 10794 R != REnd; ++R) { 10795 TemplateSpecializationKind TSK 10796 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10797 if (TSK == TSK_ExplicitInstantiationDeclaration) 10798 IsExplicitInstantiationDeclaration = true; 10799 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10800 IsExplicitInstantiationDeclaration = false; 10801 break; 10802 } 10803 } 10804 10805 if (IsExplicitInstantiationDeclaration) 10806 continue; 10807 } 10808 10809 // Mark all of the virtual members of this class as referenced, so 10810 // that we can build a vtable. Then, tell the AST consumer that a 10811 // vtable for this class is required. 10812 DefinedAnything = true; 10813 MarkVirtualMembersReferenced(Loc, Class); 10814 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10815 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10816 10817 // Optionally warn if we're emitting a weak vtable. 10818 if (Class->getLinkage() == ExternalLinkage && 10819 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10820 const FunctionDecl *KeyFunctionDef = 0; 10821 if (!KeyFunction || 10822 (KeyFunction->hasBody(KeyFunctionDef) && 10823 KeyFunctionDef->isInlined())) 10824 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 10825 } 10826 } 10827 VTableUses.clear(); 10828 10829 return DefinedAnything; 10830} 10831 10832void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10833 const CXXRecordDecl *RD) { 10834 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10835 e = RD->method_end(); i != e; ++i) { 10836 CXXMethodDecl *MD = *i; 10837 10838 // C++ [basic.def.odr]p2: 10839 // [...] A virtual member function is used if it is not pure. [...] 10840 if (MD->isVirtual() && !MD->isPure()) 10841 MarkDeclarationReferenced(Loc, MD); 10842 } 10843 10844 // Only classes that have virtual bases need a VTT. 10845 if (RD->getNumVBases() == 0) 10846 return; 10847 10848 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10849 e = RD->bases_end(); i != e; ++i) { 10850 const CXXRecordDecl *Base = 10851 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10852 if (Base->getNumVBases() == 0) 10853 continue; 10854 MarkVirtualMembersReferenced(Loc, Base); 10855 } 10856} 10857 10858/// SetIvarInitializers - This routine builds initialization ASTs for the 10859/// Objective-C implementation whose ivars need be initialized. 10860void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10861 if (!getLangOptions().CPlusPlus) 10862 return; 10863 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10864 SmallVector<ObjCIvarDecl*, 8> ivars; 10865 CollectIvarsToConstructOrDestruct(OID, ivars); 10866 if (ivars.empty()) 10867 return; 10868 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10869 for (unsigned i = 0; i < ivars.size(); i++) { 10870 FieldDecl *Field = ivars[i]; 10871 if (Field->isInvalidDecl()) 10872 continue; 10873 10874 CXXCtorInitializer *Member; 10875 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10876 InitializationKind InitKind = 10877 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10878 10879 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10880 ExprResult MemberInit = 10881 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10882 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10883 // Note, MemberInit could actually come back empty if no initialization 10884 // is required (e.g., because it would call a trivial default constructor) 10885 if (!MemberInit.get() || MemberInit.isInvalid()) 10886 continue; 10887 10888 Member = 10889 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10890 SourceLocation(), 10891 MemberInit.takeAs<Expr>(), 10892 SourceLocation()); 10893 AllToInit.push_back(Member); 10894 10895 // Be sure that the destructor is accessible and is marked as referenced. 10896 if (const RecordType *RecordTy 10897 = Context.getBaseElementType(Field->getType()) 10898 ->getAs<RecordType>()) { 10899 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10900 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10901 MarkDeclarationReferenced(Field->getLocation(), Destructor); 10902 CheckDestructorAccess(Field->getLocation(), Destructor, 10903 PDiag(diag::err_access_dtor_ivar) 10904 << Context.getBaseElementType(Field->getType())); 10905 } 10906 } 10907 } 10908 ObjCImplementation->setIvarInitializers(Context, 10909 AllToInit.data(), AllToInit.size()); 10910 } 10911} 10912 10913static 10914void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10915 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10916 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10917 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10918 Sema &S) { 10919 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10920 CE = Current.end(); 10921 if (Ctor->isInvalidDecl()) 10922 return; 10923 10924 const FunctionDecl *FNTarget = 0; 10925 CXXConstructorDecl *Target; 10926 10927 // We ignore the result here since if we don't have a body, Target will be 10928 // null below. 10929 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10930 Target 10931= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10932 10933 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10934 // Avoid dereferencing a null pointer here. 10935 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10936 10937 if (!Current.insert(Canonical)) 10938 return; 10939 10940 // We know that beyond here, we aren't chaining into a cycle. 10941 if (!Target || !Target->isDelegatingConstructor() || 10942 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10943 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10944 Valid.insert(*CI); 10945 Current.clear(); 10946 // We've hit a cycle. 10947 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 10948 Current.count(TCanonical)) { 10949 // If we haven't diagnosed this cycle yet, do so now. 10950 if (!Invalid.count(TCanonical)) { 10951 S.Diag((*Ctor->init_begin())->getSourceLocation(), 10952 diag::warn_delegating_ctor_cycle) 10953 << Ctor; 10954 10955 // Don't add a note for a function delegating directo to itself. 10956 if (TCanonical != Canonical) 10957 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 10958 10959 CXXConstructorDecl *C = Target; 10960 while (C->getCanonicalDecl() != Canonical) { 10961 (void)C->getTargetConstructor()->hasBody(FNTarget); 10962 assert(FNTarget && "Ctor cycle through bodiless function"); 10963 10964 C 10965 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 10966 S.Diag(C->getLocation(), diag::note_which_delegates_to); 10967 } 10968 } 10969 10970 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10971 Invalid.insert(*CI); 10972 Current.clear(); 10973 } else { 10974 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 10975 } 10976} 10977 10978 10979void Sema::CheckDelegatingCtorCycles() { 10980 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 10981 10982 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10983 CE = Current.end(); 10984 10985 for (DelegatingCtorDeclsType::iterator 10986 I = DelegatingCtorDecls.begin(ExternalSource), 10987 E = DelegatingCtorDecls.end(); 10988 I != E; ++I) { 10989 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 10990 } 10991 10992 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 10993 (*CI)->setInvalidDecl(); 10994} 10995 10996/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 10997Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 10998 // Implicitly declared functions (e.g. copy constructors) are 10999 // __host__ __device__ 11000 if (D->isImplicit()) 11001 return CFT_HostDevice; 11002 11003 if (D->hasAttr<CUDAGlobalAttr>()) 11004 return CFT_Global; 11005 11006 if (D->hasAttr<CUDADeviceAttr>()) { 11007 if (D->hasAttr<CUDAHostAttr>()) 11008 return CFT_HostDevice; 11009 else 11010 return CFT_Device; 11011 } 11012 11013 return CFT_Host; 11014} 11015 11016bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 11017 CUDAFunctionTarget CalleeTarget) { 11018 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 11019 // Callable from the device only." 11020 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 11021 return true; 11022 11023 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 11024 // Callable from the host only." 11025 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 11026 // Callable from the host only." 11027 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 11028 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 11029 return true; 11030 11031 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 11032 return true; 11033 11034 return false; 11035} 11036