SemaDeclCXX.cpp revision afcc96a20029ac9009feefbc555a4f9d923e3e06
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->getPreviousDecl(); 424 Older; Older = Older->getPreviousDecl()) { 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++11 [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 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 663 if (MD && MD->isInstance()) { 664 // C++11 [dcl.constexpr]p4: In the definition of a constexpr constructor... 665 // In addition, either its function-body shall be = delete or = default or 666 // it shall satisfy the following constraints: 667 // - the class shall not have any virtual base classes; 668 // 669 // We apply this to constexpr member functions too: the class cannot be a 670 // literal type, so the members are not permitted to be constexpr. 671 const CXXRecordDecl *RD = MD->getParent(); 672 if (RD->getNumVBases()) { 673 // Note, this is still illegal if the body is = default, since the 674 // implicit body does not satisfy the requirements of a constexpr 675 // constructor. We also reject cases where the body is = delete, as 676 // required by N3308. 677 if (CCK != CCK_Instantiation) { 678 Diag(NewFD->getLocation(), 679 CCK == CCK_Declaration ? diag::err_constexpr_virtual_base 680 : diag::note_constexpr_tmpl_virtual_base) 681 << isa<CXXConstructorDecl>(NewFD) << RD->isStruct() 682 << 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 } 691 692 if (!isa<CXXConstructorDecl>(NewFD)) { 693 // C++11 [dcl.constexpr]p3: 694 // The definition of a constexpr function shall satisfy the following 695 // constraints: 696 // - it shall not be virtual; 697 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 698 if (Method && Method->isVirtual()) { 699 if (CCK != CCK_Instantiation) { 700 Diag(NewFD->getLocation(), 701 CCK == CCK_Declaration ? diag::err_constexpr_virtual 702 : diag::note_constexpr_tmpl_virtual); 703 704 // If it's not obvious why this function is virtual, find an overridden 705 // function which uses the 'virtual' keyword. 706 const CXXMethodDecl *WrittenVirtual = Method; 707 while (!WrittenVirtual->isVirtualAsWritten()) 708 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 709 if (WrittenVirtual != Method) 710 Diag(WrittenVirtual->getLocation(), 711 diag::note_overridden_virtual_function); 712 } 713 return false; 714 } 715 716 // - its return type shall be a literal type; 717 QualType RT = NewFD->getResultType(); 718 if (!RT->isDependentType() && 719 RequireLiteralType(NewFD->getLocation(), RT, CCK == CCK_Declaration ? 720 PDiag(diag::err_constexpr_non_literal_return) : 721 PDiag(), 722 /*AllowIncompleteType*/ true)) { 723 if (CCK == CCK_NoteNonConstexprInstantiation) 724 Diag(NewFD->getLocation(), 725 diag::note_constexpr_tmpl_non_literal_return) << RT; 726 return false; 727 } 728 } 729 730 // - each of its parameter types shall be a literal type; 731 if (!CheckConstexprParameterTypes(*this, NewFD, CCK)) 732 return false; 733 734 return true; 735} 736 737/// Check the given declaration statement is legal within a constexpr function 738/// body. C++0x [dcl.constexpr]p3,p4. 739/// 740/// \return true if the body is OK, false if we have diagnosed a problem. 741static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 742 DeclStmt *DS) { 743 // C++0x [dcl.constexpr]p3 and p4: 744 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 745 // contain only 746 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 747 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 748 switch ((*DclIt)->getKind()) { 749 case Decl::StaticAssert: 750 case Decl::Using: 751 case Decl::UsingShadow: 752 case Decl::UsingDirective: 753 case Decl::UnresolvedUsingTypename: 754 // - static_assert-declarations 755 // - using-declarations, 756 // - using-directives, 757 continue; 758 759 case Decl::Typedef: 760 case Decl::TypeAlias: { 761 // - typedef declarations and alias-declarations that do not define 762 // classes or enumerations, 763 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 764 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 765 // Don't allow variably-modified types in constexpr functions. 766 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 767 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 768 << TL.getSourceRange() << TL.getType() 769 << isa<CXXConstructorDecl>(Dcl); 770 return false; 771 } 772 continue; 773 } 774 775 case Decl::Enum: 776 case Decl::CXXRecord: 777 // As an extension, we allow the declaration (but not the definition) of 778 // classes and enumerations in all declarations, not just in typedef and 779 // alias declarations. 780 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 781 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 782 << isa<CXXConstructorDecl>(Dcl); 783 return false; 784 } 785 continue; 786 787 case Decl::Var: 788 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 789 << isa<CXXConstructorDecl>(Dcl); 790 return false; 791 792 default: 793 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 794 << isa<CXXConstructorDecl>(Dcl); 795 return false; 796 } 797 } 798 799 return true; 800} 801 802/// Check that the given field is initialized within a constexpr constructor. 803/// 804/// \param Dcl The constexpr constructor being checked. 805/// \param Field The field being checked. This may be a member of an anonymous 806/// struct or union nested within the class being checked. 807/// \param Inits All declarations, including anonymous struct/union members and 808/// indirect members, for which any initialization was provided. 809/// \param Diagnosed Set to true if an error is produced. 810static void CheckConstexprCtorInitializer(Sema &SemaRef, 811 const FunctionDecl *Dcl, 812 FieldDecl *Field, 813 llvm::SmallSet<Decl*, 16> &Inits, 814 bool &Diagnosed) { 815 if (Field->isUnnamedBitfield()) 816 return; 817 818 if (!Inits.count(Field)) { 819 if (!Diagnosed) { 820 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 821 Diagnosed = true; 822 } 823 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 824 } else if (Field->isAnonymousStructOrUnion()) { 825 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 826 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 827 I != E; ++I) 828 // If an anonymous union contains an anonymous struct of which any member 829 // is initialized, all members must be initialized. 830 if (!RD->isUnion() || Inits.count(*I)) 831 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 832 } 833} 834 835/// Check the body for the given constexpr function declaration only contains 836/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 837/// 838/// \return true if the body is OK, false if we have diagnosed a problem. 839bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 840 if (isa<CXXTryStmt>(Body)) { 841 // C++0x [dcl.constexpr]p3: 842 // The definition of a constexpr function shall satisfy the following 843 // constraints: [...] 844 // - its function-body shall be = delete, = default, or a 845 // compound-statement 846 // 847 // C++0x [dcl.constexpr]p4: 848 // In the definition of a constexpr constructor, [...] 849 // - its function-body shall not be a function-try-block; 850 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 851 << isa<CXXConstructorDecl>(Dcl); 852 return false; 853 } 854 855 // - its function-body shall be [...] a compound-statement that contains only 856 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 857 858 llvm::SmallVector<SourceLocation, 4> ReturnStmts; 859 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 860 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 861 switch ((*BodyIt)->getStmtClass()) { 862 case Stmt::NullStmtClass: 863 // - null statements, 864 continue; 865 866 case Stmt::DeclStmtClass: 867 // - static_assert-declarations 868 // - using-declarations, 869 // - using-directives, 870 // - typedef declarations and alias-declarations that do not define 871 // classes or enumerations, 872 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 873 return false; 874 continue; 875 876 case Stmt::ReturnStmtClass: 877 // - and exactly one return statement; 878 if (isa<CXXConstructorDecl>(Dcl)) 879 break; 880 881 ReturnStmts.push_back((*BodyIt)->getLocStart()); 882 // FIXME 883 // - every constructor call and implicit conversion used in initializing 884 // the return value shall be one of those allowed in a constant 885 // expression. 886 // Deal with this as part of a general check that the function can produce 887 // a constant expression (for [dcl.constexpr]p5). 888 continue; 889 890 default: 891 break; 892 } 893 894 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 895 << isa<CXXConstructorDecl>(Dcl); 896 return false; 897 } 898 899 if (const CXXConstructorDecl *Constructor 900 = dyn_cast<CXXConstructorDecl>(Dcl)) { 901 const CXXRecordDecl *RD = Constructor->getParent(); 902 // - every non-static data member and base class sub-object shall be 903 // initialized; 904 if (RD->isUnion()) { 905 // DR1359: Exactly one member of a union shall be initialized. 906 if (Constructor->getNumCtorInitializers() == 0) { 907 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 908 return false; 909 } 910 } else if (!Constructor->isDependentContext() && 911 !Constructor->isDelegatingConstructor()) { 912 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 913 914 // Skip detailed checking if we have enough initializers, and we would 915 // allow at most one initializer per member. 916 bool AnyAnonStructUnionMembers = false; 917 unsigned Fields = 0; 918 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 919 E = RD->field_end(); I != E; ++I, ++Fields) { 920 if ((*I)->isAnonymousStructOrUnion()) { 921 AnyAnonStructUnionMembers = true; 922 break; 923 } 924 } 925 if (AnyAnonStructUnionMembers || 926 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 927 // Check initialization of non-static data members. Base classes are 928 // always initialized so do not need to be checked. Dependent bases 929 // might not have initializers in the member initializer list. 930 llvm::SmallSet<Decl*, 16> Inits; 931 for (CXXConstructorDecl::init_const_iterator 932 I = Constructor->init_begin(), E = Constructor->init_end(); 933 I != E; ++I) { 934 if (FieldDecl *FD = (*I)->getMember()) 935 Inits.insert(FD); 936 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 937 Inits.insert(ID->chain_begin(), ID->chain_end()); 938 } 939 940 bool Diagnosed = false; 941 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 942 E = RD->field_end(); I != E; ++I) 943 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 944 if (Diagnosed) 945 return false; 946 } 947 } 948 949 // FIXME 950 // - every constructor involved in initializing non-static data members 951 // and base class sub-objects shall be a constexpr constructor; 952 // - every assignment-expression that is an initializer-clause appearing 953 // directly or indirectly within a brace-or-equal-initializer for 954 // a non-static data member that is not named by a mem-initializer-id 955 // shall be a constant expression; and 956 // - every implicit conversion used in converting a constructor argument 957 // to the corresponding parameter type and converting 958 // a full-expression to the corresponding member type shall be one of 959 // those allowed in a constant expression. 960 // Deal with these as part of a general check that the function can produce 961 // a constant expression (for [dcl.constexpr]p5). 962 } else { 963 if (ReturnStmts.empty()) { 964 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 965 return false; 966 } 967 if (ReturnStmts.size() > 1) { 968 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 969 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 970 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 971 return false; 972 } 973 } 974 975 return true; 976} 977 978/// isCurrentClassName - Determine whether the identifier II is the 979/// name of the class type currently being defined. In the case of 980/// nested classes, this will only return true if II is the name of 981/// the innermost class. 982bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 983 const CXXScopeSpec *SS) { 984 assert(getLangOptions().CPlusPlus && "No class names in C!"); 985 986 CXXRecordDecl *CurDecl; 987 if (SS && SS->isSet() && !SS->isInvalid()) { 988 DeclContext *DC = computeDeclContext(*SS, true); 989 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 990 } else 991 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 992 993 if (CurDecl && CurDecl->getIdentifier()) 994 return &II == CurDecl->getIdentifier(); 995 else 996 return false; 997} 998 999/// \brief Check the validity of a C++ base class specifier. 1000/// 1001/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1002/// and returns NULL otherwise. 1003CXXBaseSpecifier * 1004Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1005 SourceRange SpecifierRange, 1006 bool Virtual, AccessSpecifier Access, 1007 TypeSourceInfo *TInfo, 1008 SourceLocation EllipsisLoc) { 1009 QualType BaseType = TInfo->getType(); 1010 1011 // C++ [class.union]p1: 1012 // A union shall not have base classes. 1013 if (Class->isUnion()) { 1014 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1015 << SpecifierRange; 1016 return 0; 1017 } 1018 1019 if (EllipsisLoc.isValid() && 1020 !TInfo->getType()->containsUnexpandedParameterPack()) { 1021 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1022 << TInfo->getTypeLoc().getSourceRange(); 1023 EllipsisLoc = SourceLocation(); 1024 } 1025 1026 if (BaseType->isDependentType()) 1027 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1028 Class->getTagKind() == TTK_Class, 1029 Access, TInfo, EllipsisLoc); 1030 1031 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1032 1033 // Base specifiers must be record types. 1034 if (!BaseType->isRecordType()) { 1035 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1036 return 0; 1037 } 1038 1039 // C++ [class.union]p1: 1040 // A union shall not be used as a base class. 1041 if (BaseType->isUnionType()) { 1042 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1043 return 0; 1044 } 1045 1046 // C++ [class.derived]p2: 1047 // The class-name in a base-specifier shall not be an incompletely 1048 // defined class. 1049 if (RequireCompleteType(BaseLoc, BaseType, 1050 PDiag(diag::err_incomplete_base_class) 1051 << SpecifierRange)) { 1052 Class->setInvalidDecl(); 1053 return 0; 1054 } 1055 1056 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1057 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1058 assert(BaseDecl && "Record type has no declaration"); 1059 BaseDecl = BaseDecl->getDefinition(); 1060 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1061 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1062 assert(CXXBaseDecl && "Base type is not a C++ type"); 1063 1064 // C++ [class]p3: 1065 // If a class is marked final and it appears as a base-type-specifier in 1066 // base-clause, the program is ill-formed. 1067 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1068 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1069 << CXXBaseDecl->getDeclName(); 1070 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1071 << CXXBaseDecl->getDeclName(); 1072 return 0; 1073 } 1074 1075 if (BaseDecl->isInvalidDecl()) 1076 Class->setInvalidDecl(); 1077 1078 // Create the base specifier. 1079 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1080 Class->getTagKind() == TTK_Class, 1081 Access, TInfo, EllipsisLoc); 1082} 1083 1084/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1085/// one entry in the base class list of a class specifier, for 1086/// example: 1087/// class foo : public bar, virtual private baz { 1088/// 'public bar' and 'virtual private baz' are each base-specifiers. 1089BaseResult 1090Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1091 bool Virtual, AccessSpecifier Access, 1092 ParsedType basetype, SourceLocation BaseLoc, 1093 SourceLocation EllipsisLoc) { 1094 if (!classdecl) 1095 return true; 1096 1097 AdjustDeclIfTemplate(classdecl); 1098 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1099 if (!Class) 1100 return true; 1101 1102 TypeSourceInfo *TInfo = 0; 1103 GetTypeFromParser(basetype, &TInfo); 1104 1105 if (EllipsisLoc.isInvalid() && 1106 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1107 UPPC_BaseType)) 1108 return true; 1109 1110 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1111 Virtual, Access, TInfo, 1112 EllipsisLoc)) 1113 return BaseSpec; 1114 1115 return true; 1116} 1117 1118/// \brief Performs the actual work of attaching the given base class 1119/// specifiers to a C++ class. 1120bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1121 unsigned NumBases) { 1122 if (NumBases == 0) 1123 return false; 1124 1125 // Used to keep track of which base types we have already seen, so 1126 // that we can properly diagnose redundant direct base types. Note 1127 // that the key is always the unqualified canonical type of the base 1128 // class. 1129 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1130 1131 // Copy non-redundant base specifiers into permanent storage. 1132 unsigned NumGoodBases = 0; 1133 bool Invalid = false; 1134 for (unsigned idx = 0; idx < NumBases; ++idx) { 1135 QualType NewBaseType 1136 = Context.getCanonicalType(Bases[idx]->getType()); 1137 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1138 if (KnownBaseTypes[NewBaseType]) { 1139 // C++ [class.mi]p3: 1140 // A class shall not be specified as a direct base class of a 1141 // derived class more than once. 1142 Diag(Bases[idx]->getSourceRange().getBegin(), 1143 diag::err_duplicate_base_class) 1144 << KnownBaseTypes[NewBaseType]->getType() 1145 << Bases[idx]->getSourceRange(); 1146 1147 // Delete the duplicate base class specifier; we're going to 1148 // overwrite its pointer later. 1149 Context.Deallocate(Bases[idx]); 1150 1151 Invalid = true; 1152 } else { 1153 // Okay, add this new base class. 1154 KnownBaseTypes[NewBaseType] = Bases[idx]; 1155 Bases[NumGoodBases++] = Bases[idx]; 1156 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) 1157 if (const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl())) 1158 if (RD->hasAttr<WeakAttr>()) 1159 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1160 } 1161 } 1162 1163 // Attach the remaining base class specifiers to the derived class. 1164 Class->setBases(Bases, NumGoodBases); 1165 1166 // Delete the remaining (good) base class specifiers, since their 1167 // data has been copied into the CXXRecordDecl. 1168 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1169 Context.Deallocate(Bases[idx]); 1170 1171 return Invalid; 1172} 1173 1174/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1175/// class, after checking whether there are any duplicate base 1176/// classes. 1177void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1178 unsigned NumBases) { 1179 if (!ClassDecl || !Bases || !NumBases) 1180 return; 1181 1182 AdjustDeclIfTemplate(ClassDecl); 1183 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1184 (CXXBaseSpecifier**)(Bases), NumBases); 1185} 1186 1187static CXXRecordDecl *GetClassForType(QualType T) { 1188 if (const RecordType *RT = T->getAs<RecordType>()) 1189 return cast<CXXRecordDecl>(RT->getDecl()); 1190 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1191 return ICT->getDecl(); 1192 else 1193 return 0; 1194} 1195 1196/// \brief Determine whether the type \p Derived is a C++ class that is 1197/// derived from the type \p Base. 1198bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1199 if (!getLangOptions().CPlusPlus) 1200 return false; 1201 1202 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1203 if (!DerivedRD) 1204 return false; 1205 1206 CXXRecordDecl *BaseRD = GetClassForType(Base); 1207 if (!BaseRD) 1208 return false; 1209 1210 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1211 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1212} 1213 1214/// \brief Determine whether the type \p Derived is a C++ class that is 1215/// derived from the type \p Base. 1216bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1217 if (!getLangOptions().CPlusPlus) 1218 return false; 1219 1220 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1221 if (!DerivedRD) 1222 return false; 1223 1224 CXXRecordDecl *BaseRD = GetClassForType(Base); 1225 if (!BaseRD) 1226 return false; 1227 1228 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1229} 1230 1231void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1232 CXXCastPath &BasePathArray) { 1233 assert(BasePathArray.empty() && "Base path array must be empty!"); 1234 assert(Paths.isRecordingPaths() && "Must record paths!"); 1235 1236 const CXXBasePath &Path = Paths.front(); 1237 1238 // We first go backward and check if we have a virtual base. 1239 // FIXME: It would be better if CXXBasePath had the base specifier for 1240 // the nearest virtual base. 1241 unsigned Start = 0; 1242 for (unsigned I = Path.size(); I != 0; --I) { 1243 if (Path[I - 1].Base->isVirtual()) { 1244 Start = I - 1; 1245 break; 1246 } 1247 } 1248 1249 // Now add all bases. 1250 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1251 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1252} 1253 1254/// \brief Determine whether the given base path includes a virtual 1255/// base class. 1256bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1257 for (CXXCastPath::const_iterator B = BasePath.begin(), 1258 BEnd = BasePath.end(); 1259 B != BEnd; ++B) 1260 if ((*B)->isVirtual()) 1261 return true; 1262 1263 return false; 1264} 1265 1266/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1267/// conversion (where Derived and Base are class types) is 1268/// well-formed, meaning that the conversion is unambiguous (and 1269/// that all of the base classes are accessible). Returns true 1270/// and emits a diagnostic if the code is ill-formed, returns false 1271/// otherwise. Loc is the location where this routine should point to 1272/// if there is an error, and Range is the source range to highlight 1273/// if there is an error. 1274bool 1275Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1276 unsigned InaccessibleBaseID, 1277 unsigned AmbigiousBaseConvID, 1278 SourceLocation Loc, SourceRange Range, 1279 DeclarationName Name, 1280 CXXCastPath *BasePath) { 1281 // First, determine whether the path from Derived to Base is 1282 // ambiguous. This is slightly more expensive than checking whether 1283 // the Derived to Base conversion exists, because here we need to 1284 // explore multiple paths to determine if there is an ambiguity. 1285 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1286 /*DetectVirtual=*/false); 1287 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1288 assert(DerivationOkay && 1289 "Can only be used with a derived-to-base conversion"); 1290 (void)DerivationOkay; 1291 1292 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1293 if (InaccessibleBaseID) { 1294 // Check that the base class can be accessed. 1295 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1296 InaccessibleBaseID)) { 1297 case AR_inaccessible: 1298 return true; 1299 case AR_accessible: 1300 case AR_dependent: 1301 case AR_delayed: 1302 break; 1303 } 1304 } 1305 1306 // Build a base path if necessary. 1307 if (BasePath) 1308 BuildBasePathArray(Paths, *BasePath); 1309 return false; 1310 } 1311 1312 // We know that the derived-to-base conversion is ambiguous, and 1313 // we're going to produce a diagnostic. Perform the derived-to-base 1314 // search just one more time to compute all of the possible paths so 1315 // that we can print them out. This is more expensive than any of 1316 // the previous derived-to-base checks we've done, but at this point 1317 // performance isn't as much of an issue. 1318 Paths.clear(); 1319 Paths.setRecordingPaths(true); 1320 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1321 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1322 (void)StillOkay; 1323 1324 // Build up a textual representation of the ambiguous paths, e.g., 1325 // D -> B -> A, that will be used to illustrate the ambiguous 1326 // conversions in the diagnostic. We only print one of the paths 1327 // to each base class subobject. 1328 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1329 1330 Diag(Loc, AmbigiousBaseConvID) 1331 << Derived << Base << PathDisplayStr << Range << Name; 1332 return true; 1333} 1334 1335bool 1336Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1337 SourceLocation Loc, SourceRange Range, 1338 CXXCastPath *BasePath, 1339 bool IgnoreAccess) { 1340 return CheckDerivedToBaseConversion(Derived, Base, 1341 IgnoreAccess ? 0 1342 : diag::err_upcast_to_inaccessible_base, 1343 diag::err_ambiguous_derived_to_base_conv, 1344 Loc, Range, DeclarationName(), 1345 BasePath); 1346} 1347 1348 1349/// @brief Builds a string representing ambiguous paths from a 1350/// specific derived class to different subobjects of the same base 1351/// class. 1352/// 1353/// This function builds a string that can be used in error messages 1354/// to show the different paths that one can take through the 1355/// inheritance hierarchy to go from the derived class to different 1356/// subobjects of a base class. The result looks something like this: 1357/// @code 1358/// struct D -> struct B -> struct A 1359/// struct D -> struct C -> struct A 1360/// @endcode 1361std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1362 std::string PathDisplayStr; 1363 std::set<unsigned> DisplayedPaths; 1364 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1365 Path != Paths.end(); ++Path) { 1366 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1367 // We haven't displayed a path to this particular base 1368 // class subobject yet. 1369 PathDisplayStr += "\n "; 1370 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1371 for (CXXBasePath::const_iterator Element = Path->begin(); 1372 Element != Path->end(); ++Element) 1373 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1374 } 1375 } 1376 1377 return PathDisplayStr; 1378} 1379 1380//===----------------------------------------------------------------------===// 1381// C++ class member Handling 1382//===----------------------------------------------------------------------===// 1383 1384/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1385bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1386 SourceLocation ASLoc, 1387 SourceLocation ColonLoc, 1388 AttributeList *Attrs) { 1389 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1390 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1391 ASLoc, ColonLoc); 1392 CurContext->addHiddenDecl(ASDecl); 1393 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1394} 1395 1396/// CheckOverrideControl - Check C++0x override control semantics. 1397void Sema::CheckOverrideControl(const Decl *D) { 1398 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1399 if (!MD || !MD->isVirtual()) 1400 return; 1401 1402 if (MD->isDependentContext()) 1403 return; 1404 1405 // C++0x [class.virtual]p3: 1406 // If a virtual function is marked with the virt-specifier override and does 1407 // not override a member function of a base class, 1408 // the program is ill-formed. 1409 bool HasOverriddenMethods = 1410 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1411 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1412 Diag(MD->getLocation(), 1413 diag::err_function_marked_override_not_overriding) 1414 << MD->getDeclName(); 1415 return; 1416 } 1417} 1418 1419/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1420/// function overrides a virtual member function marked 'final', according to 1421/// C++0x [class.virtual]p3. 1422bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1423 const CXXMethodDecl *Old) { 1424 if (!Old->hasAttr<FinalAttr>()) 1425 return false; 1426 1427 Diag(New->getLocation(), diag::err_final_function_overridden) 1428 << New->getDeclName(); 1429 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1430 return true; 1431} 1432 1433/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1434/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1435/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1436/// one has been parsed, and 'HasDeferredInit' is true if an initializer is 1437/// present but parsing it has been deferred. 1438Decl * 1439Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1440 MultiTemplateParamsArg TemplateParameterLists, 1441 Expr *BW, const VirtSpecifiers &VS, 1442 bool HasDeferredInit) { 1443 const DeclSpec &DS = D.getDeclSpec(); 1444 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1445 DeclarationName Name = NameInfo.getName(); 1446 SourceLocation Loc = NameInfo.getLoc(); 1447 1448 // For anonymous bitfields, the location should point to the type. 1449 if (Loc.isInvalid()) 1450 Loc = D.getSourceRange().getBegin(); 1451 1452 Expr *BitWidth = static_cast<Expr*>(BW); 1453 1454 assert(isa<CXXRecordDecl>(CurContext)); 1455 assert(!DS.isFriendSpecified()); 1456 1457 bool isFunc = D.isDeclarationOfFunction(); 1458 1459 // C++ 9.2p6: A member shall not be declared to have automatic storage 1460 // duration (auto, register) or with the extern storage-class-specifier. 1461 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1462 // data members and cannot be applied to names declared const or static, 1463 // and cannot be applied to reference members. 1464 switch (DS.getStorageClassSpec()) { 1465 case DeclSpec::SCS_unspecified: 1466 case DeclSpec::SCS_typedef: 1467 case DeclSpec::SCS_static: 1468 // FALL THROUGH. 1469 break; 1470 case DeclSpec::SCS_mutable: 1471 if (isFunc) { 1472 if (DS.getStorageClassSpecLoc().isValid()) 1473 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1474 else 1475 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1476 1477 // FIXME: It would be nicer if the keyword was ignored only for this 1478 // declarator. Otherwise we could get follow-up errors. 1479 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1480 } 1481 break; 1482 default: 1483 if (DS.getStorageClassSpecLoc().isValid()) 1484 Diag(DS.getStorageClassSpecLoc(), 1485 diag::err_storageclass_invalid_for_member); 1486 else 1487 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1488 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1489 } 1490 1491 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1492 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1493 !isFunc); 1494 1495 Decl *Member; 1496 if (isInstField) { 1497 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1498 1499 // Data members must have identifiers for names. 1500 if (Name.getNameKind() != DeclarationName::Identifier) { 1501 Diag(Loc, diag::err_bad_variable_name) 1502 << Name; 1503 return 0; 1504 } 1505 1506 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1507 1508 // Member field could not be with "template" keyword. 1509 // So TemplateParameterLists should be empty in this case. 1510 if (TemplateParameterLists.size()) { 1511 TemplateParameterList* TemplateParams = TemplateParameterLists.get()[0]; 1512 if (TemplateParams->size()) { 1513 // There is no such thing as a member field template. 1514 Diag(D.getIdentifierLoc(), diag::err_template_member) 1515 << II 1516 << SourceRange(TemplateParams->getTemplateLoc(), 1517 TemplateParams->getRAngleLoc()); 1518 } else { 1519 // There is an extraneous 'template<>' for this member. 1520 Diag(TemplateParams->getTemplateLoc(), 1521 diag::err_template_member_noparams) 1522 << II 1523 << SourceRange(TemplateParams->getTemplateLoc(), 1524 TemplateParams->getRAngleLoc()); 1525 } 1526 return 0; 1527 } 1528 1529 if (SS.isSet() && !SS.isInvalid()) { 1530 // The user provided a superfluous scope specifier inside a class 1531 // definition: 1532 // 1533 // class X { 1534 // int X::member; 1535 // }; 1536 DeclContext *DC = 0; 1537 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1538 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1539 << Name << FixItHint::CreateRemoval(SS.getRange()); 1540 else 1541 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1542 << Name << SS.getRange(); 1543 1544 SS.clear(); 1545 } 1546 1547 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1548 HasDeferredInit, AS); 1549 assert(Member && "HandleField never returns null"); 1550 } else { 1551 assert(!HasDeferredInit); 1552 1553 Member = HandleDeclarator(S, D, move(TemplateParameterLists)); 1554 if (!Member) { 1555 return 0; 1556 } 1557 1558 // Non-instance-fields can't have a bitfield. 1559 if (BitWidth) { 1560 if (Member->isInvalidDecl()) { 1561 // don't emit another diagnostic. 1562 } else if (isa<VarDecl>(Member)) { 1563 // C++ 9.6p3: A bit-field shall not be a static member. 1564 // "static member 'A' cannot be a bit-field" 1565 Diag(Loc, diag::err_static_not_bitfield) 1566 << Name << BitWidth->getSourceRange(); 1567 } else if (isa<TypedefDecl>(Member)) { 1568 // "typedef member 'x' cannot be a bit-field" 1569 Diag(Loc, diag::err_typedef_not_bitfield) 1570 << Name << BitWidth->getSourceRange(); 1571 } else { 1572 // A function typedef ("typedef int f(); f a;"). 1573 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1574 Diag(Loc, diag::err_not_integral_type_bitfield) 1575 << Name << cast<ValueDecl>(Member)->getType() 1576 << BitWidth->getSourceRange(); 1577 } 1578 1579 BitWidth = 0; 1580 Member->setInvalidDecl(); 1581 } 1582 1583 Member->setAccess(AS); 1584 1585 // If we have declared a member function template, set the access of the 1586 // templated declaration as well. 1587 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1588 FunTmpl->getTemplatedDecl()->setAccess(AS); 1589 } 1590 1591 if (VS.isOverrideSpecified()) { 1592 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1593 if (!MD || !MD->isVirtual()) { 1594 Diag(Member->getLocStart(), 1595 diag::override_keyword_only_allowed_on_virtual_member_functions) 1596 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1597 } else 1598 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1599 } 1600 if (VS.isFinalSpecified()) { 1601 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1602 if (!MD || !MD->isVirtual()) { 1603 Diag(Member->getLocStart(), 1604 diag::override_keyword_only_allowed_on_virtual_member_functions) 1605 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1606 } else 1607 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1608 } 1609 1610 if (VS.getLastLocation().isValid()) { 1611 // Update the end location of a method that has a virt-specifiers. 1612 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1613 MD->setRangeEnd(VS.getLastLocation()); 1614 } 1615 1616 CheckOverrideControl(Member); 1617 1618 assert((Name || isInstField) && "No identifier for non-field ?"); 1619 1620 if (isInstField) 1621 FieldCollector->Add(cast<FieldDecl>(Member)); 1622 return Member; 1623} 1624 1625/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1626/// in-class initializer for a non-static C++ class member, and after 1627/// instantiating an in-class initializer in a class template. Such actions 1628/// are deferred until the class is complete. 1629void 1630Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation EqualLoc, 1631 Expr *InitExpr) { 1632 FieldDecl *FD = cast<FieldDecl>(D); 1633 1634 if (!InitExpr) { 1635 FD->setInvalidDecl(); 1636 FD->removeInClassInitializer(); 1637 return; 1638 } 1639 1640 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1641 FD->setInvalidDecl(); 1642 FD->removeInClassInitializer(); 1643 return; 1644 } 1645 1646 ExprResult Init = InitExpr; 1647 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1648 // FIXME: if there is no EqualLoc, this is list-initialization. 1649 Init = PerformCopyInitialization( 1650 InitializedEntity::InitializeMember(FD), EqualLoc, InitExpr); 1651 if (Init.isInvalid()) { 1652 FD->setInvalidDecl(); 1653 return; 1654 } 1655 1656 CheckImplicitConversions(Init.get(), EqualLoc); 1657 } 1658 1659 // C++0x [class.base.init]p7: 1660 // The initialization of each base and member constitutes a 1661 // full-expression. 1662 Init = MaybeCreateExprWithCleanups(Init); 1663 if (Init.isInvalid()) { 1664 FD->setInvalidDecl(); 1665 return; 1666 } 1667 1668 InitExpr = Init.release(); 1669 1670 FD->setInClassInitializer(InitExpr); 1671} 1672 1673/// \brief Find the direct and/or virtual base specifiers that 1674/// correspond to the given base type, for use in base initialization 1675/// within a constructor. 1676static bool FindBaseInitializer(Sema &SemaRef, 1677 CXXRecordDecl *ClassDecl, 1678 QualType BaseType, 1679 const CXXBaseSpecifier *&DirectBaseSpec, 1680 const CXXBaseSpecifier *&VirtualBaseSpec) { 1681 // First, check for a direct base class. 1682 DirectBaseSpec = 0; 1683 for (CXXRecordDecl::base_class_const_iterator Base 1684 = ClassDecl->bases_begin(); 1685 Base != ClassDecl->bases_end(); ++Base) { 1686 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1687 // We found a direct base of this type. That's what we're 1688 // initializing. 1689 DirectBaseSpec = &*Base; 1690 break; 1691 } 1692 } 1693 1694 // Check for a virtual base class. 1695 // FIXME: We might be able to short-circuit this if we know in advance that 1696 // there are no virtual bases. 1697 VirtualBaseSpec = 0; 1698 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1699 // We haven't found a base yet; search the class hierarchy for a 1700 // virtual base class. 1701 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1702 /*DetectVirtual=*/false); 1703 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1704 BaseType, Paths)) { 1705 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1706 Path != Paths.end(); ++Path) { 1707 if (Path->back().Base->isVirtual()) { 1708 VirtualBaseSpec = Path->back().Base; 1709 break; 1710 } 1711 } 1712 } 1713 } 1714 1715 return DirectBaseSpec || VirtualBaseSpec; 1716} 1717 1718/// \brief Handle a C++ member initializer using braced-init-list syntax. 1719MemInitResult 1720Sema::ActOnMemInitializer(Decl *ConstructorD, 1721 Scope *S, 1722 CXXScopeSpec &SS, 1723 IdentifierInfo *MemberOrBase, 1724 ParsedType TemplateTypeTy, 1725 SourceLocation IdLoc, 1726 Expr *InitList, 1727 SourceLocation EllipsisLoc) { 1728 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1729 IdLoc, MultiInitializer(InitList), EllipsisLoc); 1730} 1731 1732/// \brief Handle a C++ member initializer using parentheses syntax. 1733MemInitResult 1734Sema::ActOnMemInitializer(Decl *ConstructorD, 1735 Scope *S, 1736 CXXScopeSpec &SS, 1737 IdentifierInfo *MemberOrBase, 1738 ParsedType TemplateTypeTy, 1739 SourceLocation IdLoc, 1740 SourceLocation LParenLoc, 1741 Expr **Args, unsigned NumArgs, 1742 SourceLocation RParenLoc, 1743 SourceLocation EllipsisLoc) { 1744 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1745 IdLoc, MultiInitializer(LParenLoc, Args, NumArgs, 1746 RParenLoc), 1747 EllipsisLoc); 1748} 1749 1750namespace { 1751 1752// Callback to only accept typo corrections that can be a valid C++ member 1753// intializer: either a non-static field member or a base class. 1754class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 1755 public: 1756 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 1757 : ClassDecl(ClassDecl) {} 1758 1759 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 1760 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 1761 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 1762 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 1763 else 1764 return isa<TypeDecl>(ND); 1765 } 1766 return false; 1767 } 1768 1769 private: 1770 CXXRecordDecl *ClassDecl; 1771}; 1772 1773} 1774 1775/// \brief Handle a C++ member initializer. 1776MemInitResult 1777Sema::BuildMemInitializer(Decl *ConstructorD, 1778 Scope *S, 1779 CXXScopeSpec &SS, 1780 IdentifierInfo *MemberOrBase, 1781 ParsedType TemplateTypeTy, 1782 SourceLocation IdLoc, 1783 const MultiInitializer &Args, 1784 SourceLocation EllipsisLoc) { 1785 if (!ConstructorD) 1786 return true; 1787 1788 AdjustDeclIfTemplate(ConstructorD); 1789 1790 CXXConstructorDecl *Constructor 1791 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1792 if (!Constructor) { 1793 // The user wrote a constructor initializer on a function that is 1794 // not a C++ constructor. Ignore the error for now, because we may 1795 // have more member initializers coming; we'll diagnose it just 1796 // once in ActOnMemInitializers. 1797 return true; 1798 } 1799 1800 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1801 1802 // C++ [class.base.init]p2: 1803 // Names in a mem-initializer-id are looked up in the scope of the 1804 // constructor's class and, if not found in that scope, are looked 1805 // up in the scope containing the constructor's definition. 1806 // [Note: if the constructor's class contains a member with the 1807 // same name as a direct or virtual base class of the class, a 1808 // mem-initializer-id naming the member or base class and composed 1809 // of a single identifier refers to the class member. A 1810 // mem-initializer-id for the hidden base class may be specified 1811 // using a qualified name. ] 1812 if (!SS.getScopeRep() && !TemplateTypeTy) { 1813 // Look for a member, first. 1814 DeclContext::lookup_result Result 1815 = ClassDecl->lookup(MemberOrBase); 1816 if (Result.first != Result.second) { 1817 ValueDecl *Member; 1818 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 1819 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 1820 if (EllipsisLoc.isValid()) 1821 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1822 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1823 1824 return BuildMemberInitializer(Member, Args, IdLoc); 1825 } 1826 } 1827 } 1828 // It didn't name a member, so see if it names a class. 1829 QualType BaseType; 1830 TypeSourceInfo *TInfo = 0; 1831 1832 if (TemplateTypeTy) { 1833 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1834 } else { 1835 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1836 LookupParsedName(R, S, &SS); 1837 1838 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1839 if (!TyD) { 1840 if (R.isAmbiguous()) return true; 1841 1842 // We don't want access-control diagnostics here. 1843 R.suppressDiagnostics(); 1844 1845 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1846 bool NotUnknownSpecialization = false; 1847 DeclContext *DC = computeDeclContext(SS, false); 1848 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1849 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1850 1851 if (!NotUnknownSpecialization) { 1852 // When the scope specifier can refer to a member of an unknown 1853 // specialization, we take it as a type name. 1854 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1855 SS.getWithLocInContext(Context), 1856 *MemberOrBase, IdLoc); 1857 if (BaseType.isNull()) 1858 return true; 1859 1860 R.clear(); 1861 R.setLookupName(MemberOrBase); 1862 } 1863 } 1864 1865 // If no results were found, try to correct typos. 1866 TypoCorrection Corr; 1867 MemInitializerValidatorCCC Validator(ClassDecl); 1868 if (R.empty() && BaseType.isNull() && 1869 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1870 &Validator, ClassDecl))) { 1871 std::string CorrectedStr(Corr.getAsString(getLangOptions())); 1872 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOptions())); 1873 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1874 // We have found a non-static data member with a similar 1875 // name to what was typed; complain and initialize that 1876 // member. 1877 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1878 << MemberOrBase << true << CorrectedQuotedStr 1879 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1880 Diag(Member->getLocation(), diag::note_previous_decl) 1881 << CorrectedQuotedStr; 1882 1883 return BuildMemberInitializer(Member, Args, IdLoc); 1884 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1885 const CXXBaseSpecifier *DirectBaseSpec; 1886 const CXXBaseSpecifier *VirtualBaseSpec; 1887 if (FindBaseInitializer(*this, ClassDecl, 1888 Context.getTypeDeclType(Type), 1889 DirectBaseSpec, VirtualBaseSpec)) { 1890 // We have found a direct or virtual base class with a 1891 // similar name to what was typed; complain and initialize 1892 // that base class. 1893 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1894 << MemberOrBase << false << CorrectedQuotedStr 1895 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1896 1897 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1898 : VirtualBaseSpec; 1899 Diag(BaseSpec->getSourceRange().getBegin(), 1900 diag::note_base_class_specified_here) 1901 << BaseSpec->getType() 1902 << BaseSpec->getSourceRange(); 1903 1904 TyD = Type; 1905 } 1906 } 1907 } 1908 1909 if (!TyD && BaseType.isNull()) { 1910 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1911 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1912 return true; 1913 } 1914 } 1915 1916 if (BaseType.isNull()) { 1917 BaseType = Context.getTypeDeclType(TyD); 1918 if (SS.isSet()) { 1919 NestedNameSpecifier *Qualifier = 1920 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1921 1922 // FIXME: preserve source range information 1923 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1924 } 1925 } 1926 } 1927 1928 if (!TInfo) 1929 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1930 1931 return BuildBaseInitializer(BaseType, TInfo, Args, ClassDecl, EllipsisLoc); 1932} 1933 1934/// Checks a member initializer expression for cases where reference (or 1935/// pointer) members are bound to by-value parameters (or their addresses). 1936static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 1937 Expr *Init, 1938 SourceLocation IdLoc) { 1939 QualType MemberTy = Member->getType(); 1940 1941 // We only handle pointers and references currently. 1942 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 1943 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 1944 return; 1945 1946 const bool IsPointer = MemberTy->isPointerType(); 1947 if (IsPointer) { 1948 if (const UnaryOperator *Op 1949 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 1950 // The only case we're worried about with pointers requires taking the 1951 // address. 1952 if (Op->getOpcode() != UO_AddrOf) 1953 return; 1954 1955 Init = Op->getSubExpr(); 1956 } else { 1957 // We only handle address-of expression initializers for pointers. 1958 return; 1959 } 1960 } 1961 1962 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 1963 // Taking the address of a temporary will be diagnosed as a hard error. 1964 if (IsPointer) 1965 return; 1966 1967 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 1968 << Member << Init->getSourceRange(); 1969 } else if (const DeclRefExpr *DRE 1970 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 1971 // We only warn when referring to a non-reference parameter declaration. 1972 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 1973 if (!Parameter || Parameter->getType()->isReferenceType()) 1974 return; 1975 1976 S.Diag(Init->getExprLoc(), 1977 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 1978 : diag::warn_bind_ref_member_to_parameter) 1979 << Member << Parameter << Init->getSourceRange(); 1980 } else { 1981 // Other initializers are fine. 1982 return; 1983 } 1984 1985 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 1986 << (unsigned)IsPointer; 1987} 1988 1989/// Checks an initializer expression for use of uninitialized fields, such as 1990/// containing the field that is being initialized. Returns true if there is an 1991/// uninitialized field was used an updates the SourceLocation parameter; false 1992/// otherwise. 1993static bool InitExprContainsUninitializedFields(const Stmt *S, 1994 const ValueDecl *LhsField, 1995 SourceLocation *L) { 1996 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1997 1998 if (isa<CallExpr>(S)) { 1999 // Do not descend into function calls or constructors, as the use 2000 // of an uninitialized field may be valid. One would have to inspect 2001 // the contents of the function/ctor to determine if it is safe or not. 2002 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 2003 // may be safe, depending on what the function/ctor does. 2004 return false; 2005 } 2006 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 2007 const NamedDecl *RhsField = ME->getMemberDecl(); 2008 2009 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 2010 // The member expression points to a static data member. 2011 assert(VD->isStaticDataMember() && 2012 "Member points to non-static data member!"); 2013 (void)VD; 2014 return false; 2015 } 2016 2017 if (isa<EnumConstantDecl>(RhsField)) { 2018 // The member expression points to an enum. 2019 return false; 2020 } 2021 2022 if (RhsField == LhsField) { 2023 // Initializing a field with itself. Throw a warning. 2024 // But wait; there are exceptions! 2025 // Exception #1: The field may not belong to this record. 2026 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 2027 const Expr *base = ME->getBase(); 2028 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 2029 // Even though the field matches, it does not belong to this record. 2030 return false; 2031 } 2032 // None of the exceptions triggered; return true to indicate an 2033 // uninitialized field was used. 2034 *L = ME->getMemberLoc(); 2035 return true; 2036 } 2037 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 2038 // sizeof/alignof doesn't reference contents, do not warn. 2039 return false; 2040 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 2041 // address-of doesn't reference contents (the pointer may be dereferenced 2042 // in the same expression but it would be rare; and weird). 2043 if (UOE->getOpcode() == UO_AddrOf) 2044 return false; 2045 } 2046 for (Stmt::const_child_range it = S->children(); it; ++it) { 2047 if (!*it) { 2048 // An expression such as 'member(arg ?: "")' may trigger this. 2049 continue; 2050 } 2051 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 2052 return true; 2053 } 2054 return false; 2055} 2056 2057MemInitResult 2058Sema::BuildMemberInitializer(ValueDecl *Member, 2059 const MultiInitializer &Args, 2060 SourceLocation IdLoc) { 2061 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2062 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2063 assert((DirectMember || IndirectMember) && 2064 "Member must be a FieldDecl or IndirectFieldDecl"); 2065 2066 if (Args.DiagnoseUnexpandedParameterPack(*this)) 2067 return true; 2068 2069 if (Member->isInvalidDecl()) 2070 return true; 2071 2072 // Diagnose value-uses of fields to initialize themselves, e.g. 2073 // foo(foo) 2074 // where foo is not also a parameter to the constructor. 2075 // TODO: implement -Wuninitialized and fold this into that framework. 2076 for (MultiInitializer::iterator I = Args.begin(), E = Args.end(); 2077 I != E; ++I) { 2078 SourceLocation L; 2079 Expr *Arg = *I; 2080 if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Arg)) 2081 Arg = DIE->getInit(); 2082 if (InitExprContainsUninitializedFields(Arg, Member, &L)) { 2083 // FIXME: Return true in the case when other fields are used before being 2084 // uninitialized. For example, let this field be the i'th field. When 2085 // initializing the i'th field, throw a warning if any of the >= i'th 2086 // fields are used, as they are not yet initialized. 2087 // Right now we are only handling the case where the i'th field uses 2088 // itself in its initializer. 2089 Diag(L, diag::warn_field_is_uninit); 2090 } 2091 } 2092 2093 bool HasDependentArg = Args.isTypeDependent(); 2094 2095 Expr *Init; 2096 if (Member->getType()->isDependentType() || HasDependentArg) { 2097 // Can't check initialization for a member of dependent type or when 2098 // any of the arguments are type-dependent expressions. 2099 Init = Args.CreateInitExpr(Context,Member->getType().getNonReferenceType()); 2100 2101 DiscardCleanupsInEvaluationContext(); 2102 } else { 2103 // Initialize the member. 2104 InitializedEntity MemberEntity = 2105 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2106 : InitializedEntity::InitializeMember(IndirectMember, 0); 2107 InitializationKind Kind = 2108 InitializationKind::CreateDirect(IdLoc, Args.getStartLoc(), 2109 Args.getEndLoc()); 2110 2111 ExprResult MemberInit = Args.PerformInit(*this, MemberEntity, Kind); 2112 if (MemberInit.isInvalid()) 2113 return true; 2114 2115 CheckImplicitConversions(MemberInit.get(), Args.getStartLoc()); 2116 2117 // C++0x [class.base.init]p7: 2118 // The initialization of each base and member constitutes a 2119 // full-expression. 2120 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2121 if (MemberInit.isInvalid()) 2122 return true; 2123 2124 // If we are in a dependent context, template instantiation will 2125 // perform this type-checking again. Just save the arguments that we 2126 // received in a ParenListExpr. 2127 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2128 // of the information that we have about the member 2129 // initializer. However, deconstructing the ASTs is a dicey process, 2130 // and this approach is far more likely to get the corner cases right. 2131 if (CurContext->isDependentContext()) { 2132 Init = Args.CreateInitExpr(Context, 2133 Member->getType().getNonReferenceType()); 2134 } else { 2135 Init = MemberInit.get(); 2136 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2137 } 2138 } 2139 2140 if (DirectMember) { 2141 return new (Context) CXXCtorInitializer(Context, DirectMember, 2142 IdLoc, Args.getStartLoc(), 2143 Init, Args.getEndLoc()); 2144 } else { 2145 return new (Context) CXXCtorInitializer(Context, IndirectMember, 2146 IdLoc, Args.getStartLoc(), 2147 Init, Args.getEndLoc()); 2148 } 2149} 2150 2151MemInitResult 2152Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 2153 const MultiInitializer &Args, 2154 CXXRecordDecl *ClassDecl) { 2155 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2156 if (!LangOpts.CPlusPlus0x) 2157 return Diag(NameLoc, diag::err_delegating_ctor) 2158 << TInfo->getTypeLoc().getLocalSourceRange(); 2159 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2160 2161 // Initialize the object. 2162 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2163 QualType(ClassDecl->getTypeForDecl(), 0)); 2164 InitializationKind Kind = 2165 InitializationKind::CreateDirect(NameLoc, Args.getStartLoc(), 2166 Args.getEndLoc()); 2167 2168 ExprResult DelegationInit = Args.PerformInit(*this, DelegationEntity, Kind); 2169 if (DelegationInit.isInvalid()) 2170 return true; 2171 2172 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2173 "Delegating constructor with no target?"); 2174 2175 CheckImplicitConversions(DelegationInit.get(), Args.getStartLoc()); 2176 2177 // C++0x [class.base.init]p7: 2178 // The initialization of each base and member constitutes a 2179 // full-expression. 2180 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2181 if (DelegationInit.isInvalid()) 2182 return true; 2183 2184 return new (Context) CXXCtorInitializer(Context, TInfo, Args.getStartLoc(), 2185 DelegationInit.takeAs<Expr>(), 2186 Args.getEndLoc()); 2187} 2188 2189MemInitResult 2190Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2191 const MultiInitializer &Args, 2192 CXXRecordDecl *ClassDecl, 2193 SourceLocation EllipsisLoc) { 2194 bool HasDependentArg = Args.isTypeDependent(); 2195 2196 SourceLocation BaseLoc 2197 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2198 2199 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2200 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2201 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2202 2203 // C++ [class.base.init]p2: 2204 // [...] Unless the mem-initializer-id names a nonstatic data 2205 // member of the constructor's class or a direct or virtual base 2206 // of that class, the mem-initializer is ill-formed. A 2207 // mem-initializer-list can initialize a base class using any 2208 // name that denotes that base class type. 2209 bool Dependent = BaseType->isDependentType() || HasDependentArg; 2210 2211 if (EllipsisLoc.isValid()) { 2212 // This is a pack expansion. 2213 if (!BaseType->containsUnexpandedParameterPack()) { 2214 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2215 << SourceRange(BaseLoc, Args.getEndLoc()); 2216 2217 EllipsisLoc = SourceLocation(); 2218 } 2219 } else { 2220 // Check for any unexpanded parameter packs. 2221 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2222 return true; 2223 2224 if (Args.DiagnoseUnexpandedParameterPack(*this)) 2225 return true; 2226 } 2227 2228 // Check for direct and virtual base classes. 2229 const CXXBaseSpecifier *DirectBaseSpec = 0; 2230 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2231 if (!Dependent) { 2232 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2233 BaseType)) 2234 return BuildDelegatingInitializer(BaseTInfo, Args, ClassDecl); 2235 2236 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2237 VirtualBaseSpec); 2238 2239 // C++ [base.class.init]p2: 2240 // Unless the mem-initializer-id names a nonstatic data member of the 2241 // constructor's class or a direct or virtual base of that class, the 2242 // mem-initializer is ill-formed. 2243 if (!DirectBaseSpec && !VirtualBaseSpec) { 2244 // If the class has any dependent bases, then it's possible that 2245 // one of those types will resolve to the same type as 2246 // BaseType. Therefore, just treat this as a dependent base 2247 // class initialization. FIXME: Should we try to check the 2248 // initialization anyway? It seems odd. 2249 if (ClassDecl->hasAnyDependentBases()) 2250 Dependent = true; 2251 else 2252 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2253 << BaseType << Context.getTypeDeclType(ClassDecl) 2254 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2255 } 2256 } 2257 2258 if (Dependent) { 2259 // Can't check initialization for a base of dependent type or when 2260 // any of the arguments are type-dependent expressions. 2261 Expr *BaseInit = Args.CreateInitExpr(Context, BaseType); 2262 2263 DiscardCleanupsInEvaluationContext(); 2264 2265 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2266 /*IsVirtual=*/false, 2267 Args.getStartLoc(), BaseInit, 2268 Args.getEndLoc(), EllipsisLoc); 2269 } 2270 2271 // C++ [base.class.init]p2: 2272 // If a mem-initializer-id is ambiguous because it designates both 2273 // a direct non-virtual base class and an inherited virtual base 2274 // class, the mem-initializer is ill-formed. 2275 if (DirectBaseSpec && VirtualBaseSpec) 2276 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2277 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2278 2279 CXXBaseSpecifier *BaseSpec 2280 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2281 if (!BaseSpec) 2282 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2283 2284 // Initialize the base. 2285 InitializedEntity BaseEntity = 2286 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2287 InitializationKind Kind = 2288 InitializationKind::CreateDirect(BaseLoc, Args.getStartLoc(), 2289 Args.getEndLoc()); 2290 2291 ExprResult BaseInit = Args.PerformInit(*this, BaseEntity, Kind); 2292 if (BaseInit.isInvalid()) 2293 return true; 2294 2295 CheckImplicitConversions(BaseInit.get(), Args.getStartLoc()); 2296 2297 // C++0x [class.base.init]p7: 2298 // The initialization of each base and member constitutes a 2299 // full-expression. 2300 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2301 if (BaseInit.isInvalid()) 2302 return true; 2303 2304 // If we are in a dependent context, template instantiation will 2305 // perform this type-checking again. Just save the arguments that we 2306 // received in a ParenListExpr. 2307 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2308 // of the information that we have about the base 2309 // initializer. However, deconstructing the ASTs is a dicey process, 2310 // and this approach is far more likely to get the corner cases right. 2311 if (CurContext->isDependentContext()) 2312 BaseInit = Owned(Args.CreateInitExpr(Context, BaseType)); 2313 2314 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2315 BaseSpec->isVirtual(), 2316 Args.getStartLoc(), 2317 BaseInit.takeAs<Expr>(), 2318 Args.getEndLoc(), EllipsisLoc); 2319} 2320 2321// Create a static_cast\<T&&>(expr). 2322static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2323 QualType ExprType = E->getType(); 2324 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2325 SourceLocation ExprLoc = E->getLocStart(); 2326 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2327 TargetType, ExprLoc); 2328 2329 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2330 SourceRange(ExprLoc, ExprLoc), 2331 E->getSourceRange()).take(); 2332} 2333 2334/// ImplicitInitializerKind - How an implicit base or member initializer should 2335/// initialize its base or member. 2336enum ImplicitInitializerKind { 2337 IIK_Default, 2338 IIK_Copy, 2339 IIK_Move 2340}; 2341 2342static bool 2343BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2344 ImplicitInitializerKind ImplicitInitKind, 2345 CXXBaseSpecifier *BaseSpec, 2346 bool IsInheritedVirtualBase, 2347 CXXCtorInitializer *&CXXBaseInit) { 2348 InitializedEntity InitEntity 2349 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2350 IsInheritedVirtualBase); 2351 2352 ExprResult BaseInit; 2353 2354 switch (ImplicitInitKind) { 2355 case IIK_Default: { 2356 InitializationKind InitKind 2357 = InitializationKind::CreateDefault(Constructor->getLocation()); 2358 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2359 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2360 MultiExprArg(SemaRef, 0, 0)); 2361 break; 2362 } 2363 2364 case IIK_Move: 2365 case IIK_Copy: { 2366 bool Moving = ImplicitInitKind == IIK_Move; 2367 ParmVarDecl *Param = Constructor->getParamDecl(0); 2368 QualType ParamType = Param->getType().getNonReferenceType(); 2369 2370 SemaRef.MarkDeclarationReferenced(Constructor->getLocation(), Param); 2371 2372 Expr *CopyCtorArg = 2373 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 2374 Constructor->getLocation(), ParamType, 2375 VK_LValue, 0); 2376 2377 // Cast to the base class to avoid ambiguities. 2378 QualType ArgTy = 2379 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2380 ParamType.getQualifiers()); 2381 2382 if (Moving) { 2383 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2384 } 2385 2386 CXXCastPath BasePath; 2387 BasePath.push_back(BaseSpec); 2388 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2389 CK_UncheckedDerivedToBase, 2390 Moving ? VK_XValue : VK_LValue, 2391 &BasePath).take(); 2392 2393 InitializationKind InitKind 2394 = InitializationKind::CreateDirect(Constructor->getLocation(), 2395 SourceLocation(), SourceLocation()); 2396 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2397 &CopyCtorArg, 1); 2398 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2399 MultiExprArg(&CopyCtorArg, 1)); 2400 break; 2401 } 2402 } 2403 2404 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2405 if (BaseInit.isInvalid()) 2406 return true; 2407 2408 CXXBaseInit = 2409 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2410 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2411 SourceLocation()), 2412 BaseSpec->isVirtual(), 2413 SourceLocation(), 2414 BaseInit.takeAs<Expr>(), 2415 SourceLocation(), 2416 SourceLocation()); 2417 2418 return false; 2419} 2420 2421static bool RefersToRValueRef(Expr *MemRef) { 2422 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2423 return Referenced->getType()->isRValueReferenceType(); 2424} 2425 2426static bool 2427BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2428 ImplicitInitializerKind ImplicitInitKind, 2429 FieldDecl *Field, IndirectFieldDecl *Indirect, 2430 CXXCtorInitializer *&CXXMemberInit) { 2431 if (Field->isInvalidDecl()) 2432 return true; 2433 2434 SourceLocation Loc = Constructor->getLocation(); 2435 2436 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2437 bool Moving = ImplicitInitKind == IIK_Move; 2438 ParmVarDecl *Param = Constructor->getParamDecl(0); 2439 QualType ParamType = Param->getType().getNonReferenceType(); 2440 2441 SemaRef.MarkDeclarationReferenced(Constructor->getLocation(), Param); 2442 2443 // Suppress copying zero-width bitfields. 2444 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2445 return false; 2446 2447 Expr *MemberExprBase = 2448 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 2449 Loc, ParamType, VK_LValue, 0); 2450 2451 if (Moving) { 2452 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2453 } 2454 2455 // Build a reference to this field within the parameter. 2456 CXXScopeSpec SS; 2457 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2458 Sema::LookupMemberName); 2459 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2460 : cast<ValueDecl>(Field), AS_public); 2461 MemberLookup.resolveKind(); 2462 ExprResult CtorArg 2463 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2464 ParamType, Loc, 2465 /*IsArrow=*/false, 2466 SS, 2467 /*FirstQualifierInScope=*/0, 2468 MemberLookup, 2469 /*TemplateArgs=*/0); 2470 if (CtorArg.isInvalid()) 2471 return true; 2472 2473 // C++11 [class.copy]p15: 2474 // - if a member m has rvalue reference type T&&, it is direct-initialized 2475 // with static_cast<T&&>(x.m); 2476 if (RefersToRValueRef(CtorArg.get())) { 2477 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2478 } 2479 2480 // When the field we are copying is an array, create index variables for 2481 // each dimension of the array. We use these index variables to subscript 2482 // the source array, and other clients (e.g., CodeGen) will perform the 2483 // necessary iteration with these index variables. 2484 SmallVector<VarDecl *, 4> IndexVariables; 2485 QualType BaseType = Field->getType(); 2486 QualType SizeType = SemaRef.Context.getSizeType(); 2487 bool InitializingArray = false; 2488 while (const ConstantArrayType *Array 2489 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2490 InitializingArray = true; 2491 // Create the iteration variable for this array index. 2492 IdentifierInfo *IterationVarName = 0; 2493 { 2494 llvm::SmallString<8> Str; 2495 llvm::raw_svector_ostream OS(Str); 2496 OS << "__i" << IndexVariables.size(); 2497 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2498 } 2499 VarDecl *IterationVar 2500 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2501 IterationVarName, SizeType, 2502 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2503 SC_None, SC_None); 2504 IndexVariables.push_back(IterationVar); 2505 2506 // Create a reference to the iteration variable. 2507 ExprResult IterationVarRef 2508 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2509 assert(!IterationVarRef.isInvalid() && 2510 "Reference to invented variable cannot fail!"); 2511 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2512 assert(!IterationVarRef.isInvalid() && 2513 "Conversion of invented variable cannot fail!"); 2514 2515 // Subscript the array with this iteration variable. 2516 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2517 IterationVarRef.take(), 2518 Loc); 2519 if (CtorArg.isInvalid()) 2520 return true; 2521 2522 BaseType = Array->getElementType(); 2523 } 2524 2525 // The array subscript expression is an lvalue, which is wrong for moving. 2526 if (Moving && InitializingArray) 2527 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2528 2529 // Construct the entity that we will be initializing. For an array, this 2530 // will be first element in the array, which may require several levels 2531 // of array-subscript entities. 2532 SmallVector<InitializedEntity, 4> Entities; 2533 Entities.reserve(1 + IndexVariables.size()); 2534 if (Indirect) 2535 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2536 else 2537 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2538 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2539 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2540 0, 2541 Entities.back())); 2542 2543 // Direct-initialize to use the copy constructor. 2544 InitializationKind InitKind = 2545 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2546 2547 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2548 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2549 &CtorArgE, 1); 2550 2551 ExprResult MemberInit 2552 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2553 MultiExprArg(&CtorArgE, 1)); 2554 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2555 if (MemberInit.isInvalid()) 2556 return true; 2557 2558 if (Indirect) { 2559 assert(IndexVariables.size() == 0 && 2560 "Indirect field improperly initialized"); 2561 CXXMemberInit 2562 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2563 Loc, Loc, 2564 MemberInit.takeAs<Expr>(), 2565 Loc); 2566 } else 2567 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2568 Loc, MemberInit.takeAs<Expr>(), 2569 Loc, 2570 IndexVariables.data(), 2571 IndexVariables.size()); 2572 return false; 2573 } 2574 2575 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2576 2577 QualType FieldBaseElementType = 2578 SemaRef.Context.getBaseElementType(Field->getType()); 2579 2580 if (FieldBaseElementType->isRecordType()) { 2581 InitializedEntity InitEntity 2582 = Indirect? InitializedEntity::InitializeMember(Indirect) 2583 : InitializedEntity::InitializeMember(Field); 2584 InitializationKind InitKind = 2585 InitializationKind::CreateDefault(Loc); 2586 2587 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2588 ExprResult MemberInit = 2589 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2590 2591 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2592 if (MemberInit.isInvalid()) 2593 return true; 2594 2595 if (Indirect) 2596 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2597 Indirect, Loc, 2598 Loc, 2599 MemberInit.get(), 2600 Loc); 2601 else 2602 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2603 Field, Loc, Loc, 2604 MemberInit.get(), 2605 Loc); 2606 return false; 2607 } 2608 2609 if (!Field->getParent()->isUnion()) { 2610 if (FieldBaseElementType->isReferenceType()) { 2611 SemaRef.Diag(Constructor->getLocation(), 2612 diag::err_uninitialized_member_in_ctor) 2613 << (int)Constructor->isImplicit() 2614 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2615 << 0 << Field->getDeclName(); 2616 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2617 return true; 2618 } 2619 2620 if (FieldBaseElementType.isConstQualified()) { 2621 SemaRef.Diag(Constructor->getLocation(), 2622 diag::err_uninitialized_member_in_ctor) 2623 << (int)Constructor->isImplicit() 2624 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2625 << 1 << Field->getDeclName(); 2626 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2627 return true; 2628 } 2629 } 2630 2631 if (SemaRef.getLangOptions().ObjCAutoRefCount && 2632 FieldBaseElementType->isObjCRetainableType() && 2633 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2634 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2635 // Instant objects: 2636 // Default-initialize Objective-C pointers to NULL. 2637 CXXMemberInit 2638 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2639 Loc, Loc, 2640 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2641 Loc); 2642 return false; 2643 } 2644 2645 // Nothing to initialize. 2646 CXXMemberInit = 0; 2647 return false; 2648} 2649 2650namespace { 2651struct BaseAndFieldInfo { 2652 Sema &S; 2653 CXXConstructorDecl *Ctor; 2654 bool AnyErrorsInInits; 2655 ImplicitInitializerKind IIK; 2656 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2657 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2658 2659 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2660 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2661 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2662 if (Generated && Ctor->isCopyConstructor()) 2663 IIK = IIK_Copy; 2664 else if (Generated && Ctor->isMoveConstructor()) 2665 IIK = IIK_Move; 2666 else 2667 IIK = IIK_Default; 2668 } 2669 2670 bool isImplicitCopyOrMove() const { 2671 switch (IIK) { 2672 case IIK_Copy: 2673 case IIK_Move: 2674 return true; 2675 2676 case IIK_Default: 2677 return false; 2678 } 2679 2680 llvm_unreachable("Invalid ImplicitInitializerKind!"); 2681 } 2682}; 2683} 2684 2685/// \brief Determine whether the given indirect field declaration is somewhere 2686/// within an anonymous union. 2687static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2688 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2689 CEnd = F->chain_end(); 2690 C != CEnd; ++C) 2691 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2692 if (Record->isUnion()) 2693 return true; 2694 2695 return false; 2696} 2697 2698/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2699/// array type. 2700static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2701 if (T->isIncompleteArrayType()) 2702 return true; 2703 2704 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2705 if (!ArrayT->getSize()) 2706 return true; 2707 2708 T = ArrayT->getElementType(); 2709 } 2710 2711 return false; 2712} 2713 2714static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2715 FieldDecl *Field, 2716 IndirectFieldDecl *Indirect = 0) { 2717 2718 // Overwhelmingly common case: we have a direct initializer for this field. 2719 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2720 Info.AllToInit.push_back(Init); 2721 return false; 2722 } 2723 2724 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2725 // has a brace-or-equal-initializer, the entity is initialized as specified 2726 // in [dcl.init]. 2727 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 2728 CXXCtorInitializer *Init; 2729 if (Indirect) 2730 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2731 SourceLocation(), 2732 SourceLocation(), 0, 2733 SourceLocation()); 2734 else 2735 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2736 SourceLocation(), 2737 SourceLocation(), 0, 2738 SourceLocation()); 2739 Info.AllToInit.push_back(Init); 2740 return false; 2741 } 2742 2743 // Don't build an implicit initializer for union members if none was 2744 // explicitly specified. 2745 if (Field->getParent()->isUnion() || 2746 (Indirect && isWithinAnonymousUnion(Indirect))) 2747 return false; 2748 2749 // Don't initialize incomplete or zero-length arrays. 2750 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 2751 return false; 2752 2753 // Don't try to build an implicit initializer if there were semantic 2754 // errors in any of the initializers (and therefore we might be 2755 // missing some that the user actually wrote). 2756 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2757 return false; 2758 2759 CXXCtorInitializer *Init = 0; 2760 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2761 Indirect, Init)) 2762 return true; 2763 2764 if (Init) 2765 Info.AllToInit.push_back(Init); 2766 2767 return false; 2768} 2769 2770bool 2771Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2772 CXXCtorInitializer *Initializer) { 2773 assert(Initializer->isDelegatingInitializer()); 2774 Constructor->setNumCtorInitializers(1); 2775 CXXCtorInitializer **initializer = 2776 new (Context) CXXCtorInitializer*[1]; 2777 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2778 Constructor->setCtorInitializers(initializer); 2779 2780 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2781 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2782 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2783 } 2784 2785 DelegatingCtorDecls.push_back(Constructor); 2786 2787 return false; 2788} 2789 2790bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2791 CXXCtorInitializer **Initializers, 2792 unsigned NumInitializers, 2793 bool AnyErrors) { 2794 if (Constructor->isDependentContext()) { 2795 // Just store the initializers as written, they will be checked during 2796 // instantiation. 2797 if (NumInitializers > 0) { 2798 Constructor->setNumCtorInitializers(NumInitializers); 2799 CXXCtorInitializer **baseOrMemberInitializers = 2800 new (Context) CXXCtorInitializer*[NumInitializers]; 2801 memcpy(baseOrMemberInitializers, Initializers, 2802 NumInitializers * sizeof(CXXCtorInitializer*)); 2803 Constructor->setCtorInitializers(baseOrMemberInitializers); 2804 } 2805 2806 return false; 2807 } 2808 2809 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2810 2811 // We need to build the initializer AST according to order of construction 2812 // and not what user specified in the Initializers list. 2813 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2814 if (!ClassDecl) 2815 return true; 2816 2817 bool HadError = false; 2818 2819 for (unsigned i = 0; i < NumInitializers; i++) { 2820 CXXCtorInitializer *Member = Initializers[i]; 2821 2822 if (Member->isBaseInitializer()) 2823 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2824 else 2825 Info.AllBaseFields[Member->getAnyMember()] = Member; 2826 } 2827 2828 // Keep track of the direct virtual bases. 2829 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2830 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2831 E = ClassDecl->bases_end(); I != E; ++I) { 2832 if (I->isVirtual()) 2833 DirectVBases.insert(I); 2834 } 2835 2836 // Push virtual bases before others. 2837 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2838 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2839 2840 if (CXXCtorInitializer *Value 2841 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2842 Info.AllToInit.push_back(Value); 2843 } else if (!AnyErrors) { 2844 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2845 CXXCtorInitializer *CXXBaseInit; 2846 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2847 VBase, IsInheritedVirtualBase, 2848 CXXBaseInit)) { 2849 HadError = true; 2850 continue; 2851 } 2852 2853 Info.AllToInit.push_back(CXXBaseInit); 2854 } 2855 } 2856 2857 // Non-virtual bases. 2858 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2859 E = ClassDecl->bases_end(); Base != E; ++Base) { 2860 // Virtuals are in the virtual base list and already constructed. 2861 if (Base->isVirtual()) 2862 continue; 2863 2864 if (CXXCtorInitializer *Value 2865 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2866 Info.AllToInit.push_back(Value); 2867 } else if (!AnyErrors) { 2868 CXXCtorInitializer *CXXBaseInit; 2869 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2870 Base, /*IsInheritedVirtualBase=*/false, 2871 CXXBaseInit)) { 2872 HadError = true; 2873 continue; 2874 } 2875 2876 Info.AllToInit.push_back(CXXBaseInit); 2877 } 2878 } 2879 2880 // Fields. 2881 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 2882 MemEnd = ClassDecl->decls_end(); 2883 Mem != MemEnd; ++Mem) { 2884 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 2885 // C++ [class.bit]p2: 2886 // A declaration for a bit-field that omits the identifier declares an 2887 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 2888 // initialized. 2889 if (F->isUnnamedBitfield()) 2890 continue; 2891 2892 // If we're not generating the implicit copy/move constructor, then we'll 2893 // handle anonymous struct/union fields based on their individual 2894 // indirect fields. 2895 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 2896 continue; 2897 2898 if (CollectFieldInitializer(*this, Info, F)) 2899 HadError = true; 2900 continue; 2901 } 2902 2903 // Beyond this point, we only consider default initialization. 2904 if (Info.IIK != IIK_Default) 2905 continue; 2906 2907 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 2908 if (F->getType()->isIncompleteArrayType()) { 2909 assert(ClassDecl->hasFlexibleArrayMember() && 2910 "Incomplete array type is not valid"); 2911 continue; 2912 } 2913 2914 // Initialize each field of an anonymous struct individually. 2915 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 2916 HadError = true; 2917 2918 continue; 2919 } 2920 } 2921 2922 NumInitializers = Info.AllToInit.size(); 2923 if (NumInitializers > 0) { 2924 Constructor->setNumCtorInitializers(NumInitializers); 2925 CXXCtorInitializer **baseOrMemberInitializers = 2926 new (Context) CXXCtorInitializer*[NumInitializers]; 2927 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2928 NumInitializers * sizeof(CXXCtorInitializer*)); 2929 Constructor->setCtorInitializers(baseOrMemberInitializers); 2930 2931 // Constructors implicitly reference the base and member 2932 // destructors. 2933 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2934 Constructor->getParent()); 2935 } 2936 2937 return HadError; 2938} 2939 2940static void *GetKeyForTopLevelField(FieldDecl *Field) { 2941 // For anonymous unions, use the class declaration as the key. 2942 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2943 if (RT->getDecl()->isAnonymousStructOrUnion()) 2944 return static_cast<void *>(RT->getDecl()); 2945 } 2946 return static_cast<void *>(Field); 2947} 2948 2949static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2950 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2951} 2952 2953static void *GetKeyForMember(ASTContext &Context, 2954 CXXCtorInitializer *Member) { 2955 if (!Member->isAnyMemberInitializer()) 2956 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2957 2958 // For fields injected into the class via declaration of an anonymous union, 2959 // use its anonymous union class declaration as the unique key. 2960 FieldDecl *Field = Member->getAnyMember(); 2961 2962 // If the field is a member of an anonymous struct or union, our key 2963 // is the anonymous record decl that's a direct child of the class. 2964 RecordDecl *RD = Field->getParent(); 2965 if (RD->isAnonymousStructOrUnion()) { 2966 while (true) { 2967 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2968 if (Parent->isAnonymousStructOrUnion()) 2969 RD = Parent; 2970 else 2971 break; 2972 } 2973 2974 return static_cast<void *>(RD); 2975 } 2976 2977 return static_cast<void *>(Field); 2978} 2979 2980static void 2981DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2982 const CXXConstructorDecl *Constructor, 2983 CXXCtorInitializer **Inits, 2984 unsigned NumInits) { 2985 if (Constructor->getDeclContext()->isDependentContext()) 2986 return; 2987 2988 // Don't check initializers order unless the warning is enabled at the 2989 // location of at least one initializer. 2990 bool ShouldCheckOrder = false; 2991 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2992 CXXCtorInitializer *Init = Inits[InitIndex]; 2993 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2994 Init->getSourceLocation()) 2995 != DiagnosticsEngine::Ignored) { 2996 ShouldCheckOrder = true; 2997 break; 2998 } 2999 } 3000 if (!ShouldCheckOrder) 3001 return; 3002 3003 // Build the list of bases and members in the order that they'll 3004 // actually be initialized. The explicit initializers should be in 3005 // this same order but may be missing things. 3006 SmallVector<const void*, 32> IdealInitKeys; 3007 3008 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3009 3010 // 1. Virtual bases. 3011 for (CXXRecordDecl::base_class_const_iterator VBase = 3012 ClassDecl->vbases_begin(), 3013 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3014 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3015 3016 // 2. Non-virtual bases. 3017 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3018 E = ClassDecl->bases_end(); Base != E; ++Base) { 3019 if (Base->isVirtual()) 3020 continue; 3021 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3022 } 3023 3024 // 3. Direct fields. 3025 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3026 E = ClassDecl->field_end(); Field != E; ++Field) { 3027 if (Field->isUnnamedBitfield()) 3028 continue; 3029 3030 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 3031 } 3032 3033 unsigned NumIdealInits = IdealInitKeys.size(); 3034 unsigned IdealIndex = 0; 3035 3036 CXXCtorInitializer *PrevInit = 0; 3037 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3038 CXXCtorInitializer *Init = Inits[InitIndex]; 3039 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3040 3041 // Scan forward to try to find this initializer in the idealized 3042 // initializers list. 3043 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3044 if (InitKey == IdealInitKeys[IdealIndex]) 3045 break; 3046 3047 // If we didn't find this initializer, it must be because we 3048 // scanned past it on a previous iteration. That can only 3049 // happen if we're out of order; emit a warning. 3050 if (IdealIndex == NumIdealInits && PrevInit) { 3051 Sema::SemaDiagnosticBuilder D = 3052 SemaRef.Diag(PrevInit->getSourceLocation(), 3053 diag::warn_initializer_out_of_order); 3054 3055 if (PrevInit->isAnyMemberInitializer()) 3056 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3057 else 3058 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3059 3060 if (Init->isAnyMemberInitializer()) 3061 D << 0 << Init->getAnyMember()->getDeclName(); 3062 else 3063 D << 1 << Init->getTypeSourceInfo()->getType(); 3064 3065 // Move back to the initializer's location in the ideal list. 3066 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3067 if (InitKey == IdealInitKeys[IdealIndex]) 3068 break; 3069 3070 assert(IdealIndex != NumIdealInits && 3071 "initializer not found in initializer list"); 3072 } 3073 3074 PrevInit = Init; 3075 } 3076} 3077 3078namespace { 3079bool CheckRedundantInit(Sema &S, 3080 CXXCtorInitializer *Init, 3081 CXXCtorInitializer *&PrevInit) { 3082 if (!PrevInit) { 3083 PrevInit = Init; 3084 return false; 3085 } 3086 3087 if (FieldDecl *Field = Init->getMember()) 3088 S.Diag(Init->getSourceLocation(), 3089 diag::err_multiple_mem_initialization) 3090 << Field->getDeclName() 3091 << Init->getSourceRange(); 3092 else { 3093 const Type *BaseClass = Init->getBaseClass(); 3094 assert(BaseClass && "neither field nor base"); 3095 S.Diag(Init->getSourceLocation(), 3096 diag::err_multiple_base_initialization) 3097 << QualType(BaseClass, 0) 3098 << Init->getSourceRange(); 3099 } 3100 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3101 << 0 << PrevInit->getSourceRange(); 3102 3103 return true; 3104} 3105 3106typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3107typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3108 3109bool CheckRedundantUnionInit(Sema &S, 3110 CXXCtorInitializer *Init, 3111 RedundantUnionMap &Unions) { 3112 FieldDecl *Field = Init->getAnyMember(); 3113 RecordDecl *Parent = Field->getParent(); 3114 NamedDecl *Child = Field; 3115 3116 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3117 if (Parent->isUnion()) { 3118 UnionEntry &En = Unions[Parent]; 3119 if (En.first && En.first != Child) { 3120 S.Diag(Init->getSourceLocation(), 3121 diag::err_multiple_mem_union_initialization) 3122 << Field->getDeclName() 3123 << Init->getSourceRange(); 3124 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3125 << 0 << En.second->getSourceRange(); 3126 return true; 3127 } 3128 if (!En.first) { 3129 En.first = Child; 3130 En.second = Init; 3131 } 3132 if (!Parent->isAnonymousStructOrUnion()) 3133 return false; 3134 } 3135 3136 Child = Parent; 3137 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3138 } 3139 3140 return false; 3141} 3142} 3143 3144/// ActOnMemInitializers - Handle the member initializers for a constructor. 3145void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3146 SourceLocation ColonLoc, 3147 CXXCtorInitializer **meminits, 3148 unsigned NumMemInits, 3149 bool AnyErrors) { 3150 if (!ConstructorDecl) 3151 return; 3152 3153 AdjustDeclIfTemplate(ConstructorDecl); 3154 3155 CXXConstructorDecl *Constructor 3156 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3157 3158 if (!Constructor) { 3159 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3160 return; 3161 } 3162 3163 CXXCtorInitializer **MemInits = 3164 reinterpret_cast<CXXCtorInitializer **>(meminits); 3165 3166 // Mapping for the duplicate initializers check. 3167 // For member initializers, this is keyed with a FieldDecl*. 3168 // For base initializers, this is keyed with a Type*. 3169 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3170 3171 // Mapping for the inconsistent anonymous-union initializers check. 3172 RedundantUnionMap MemberUnions; 3173 3174 bool HadError = false; 3175 for (unsigned i = 0; i < NumMemInits; i++) { 3176 CXXCtorInitializer *Init = MemInits[i]; 3177 3178 // Set the source order index. 3179 Init->setSourceOrder(i); 3180 3181 if (Init->isAnyMemberInitializer()) { 3182 FieldDecl *Field = Init->getAnyMember(); 3183 if (CheckRedundantInit(*this, Init, Members[Field]) || 3184 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3185 HadError = true; 3186 } else if (Init->isBaseInitializer()) { 3187 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3188 if (CheckRedundantInit(*this, Init, Members[Key])) 3189 HadError = true; 3190 } else { 3191 assert(Init->isDelegatingInitializer()); 3192 // This must be the only initializer 3193 if (i != 0 || NumMemInits > 1) { 3194 Diag(MemInits[0]->getSourceLocation(), 3195 diag::err_delegating_initializer_alone) 3196 << MemInits[0]->getSourceRange(); 3197 HadError = true; 3198 // We will treat this as being the only initializer. 3199 } 3200 SetDelegatingInitializer(Constructor, MemInits[i]); 3201 // Return immediately as the initializer is set. 3202 return; 3203 } 3204 } 3205 3206 if (HadError) 3207 return; 3208 3209 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3210 3211 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3212} 3213 3214void 3215Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3216 CXXRecordDecl *ClassDecl) { 3217 // Ignore dependent contexts. Also ignore unions, since their members never 3218 // have destructors implicitly called. 3219 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3220 return; 3221 3222 // FIXME: all the access-control diagnostics are positioned on the 3223 // field/base declaration. That's probably good; that said, the 3224 // user might reasonably want to know why the destructor is being 3225 // emitted, and we currently don't say. 3226 3227 // Non-static data members. 3228 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3229 E = ClassDecl->field_end(); I != E; ++I) { 3230 FieldDecl *Field = *I; 3231 if (Field->isInvalidDecl()) 3232 continue; 3233 3234 // Don't destroy incomplete or zero-length arrays. 3235 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3236 continue; 3237 3238 QualType FieldType = Context.getBaseElementType(Field->getType()); 3239 3240 const RecordType* RT = FieldType->getAs<RecordType>(); 3241 if (!RT) 3242 continue; 3243 3244 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3245 if (FieldClassDecl->isInvalidDecl()) 3246 continue; 3247 if (FieldClassDecl->hasTrivialDestructor()) 3248 continue; 3249 3250 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3251 assert(Dtor && "No dtor found for FieldClassDecl!"); 3252 CheckDestructorAccess(Field->getLocation(), Dtor, 3253 PDiag(diag::err_access_dtor_field) 3254 << Field->getDeclName() 3255 << FieldType); 3256 3257 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3258 } 3259 3260 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3261 3262 // Bases. 3263 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3264 E = ClassDecl->bases_end(); Base != E; ++Base) { 3265 // Bases are always records in a well-formed non-dependent class. 3266 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3267 3268 // Remember direct virtual bases. 3269 if (Base->isVirtual()) 3270 DirectVirtualBases.insert(RT); 3271 3272 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3273 // If our base class is invalid, we probably can't get its dtor anyway. 3274 if (BaseClassDecl->isInvalidDecl()) 3275 continue; 3276 // Ignore trivial destructors. 3277 if (BaseClassDecl->hasTrivialDestructor()) 3278 continue; 3279 3280 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3281 assert(Dtor && "No dtor found for BaseClassDecl!"); 3282 3283 // FIXME: caret should be on the start of the class name 3284 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 3285 PDiag(diag::err_access_dtor_base) 3286 << Base->getType() 3287 << Base->getSourceRange()); 3288 3289 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3290 } 3291 3292 // Virtual bases. 3293 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3294 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3295 3296 // Bases are always records in a well-formed non-dependent class. 3297 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 3298 3299 // Ignore direct virtual bases. 3300 if (DirectVirtualBases.count(RT)) 3301 continue; 3302 3303 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3304 // If our base class is invalid, we probably can't get its dtor anyway. 3305 if (BaseClassDecl->isInvalidDecl()) 3306 continue; 3307 // Ignore trivial destructors. 3308 if (BaseClassDecl->hasTrivialDestructor()) 3309 continue; 3310 3311 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3312 assert(Dtor && "No dtor found for BaseClassDecl!"); 3313 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3314 PDiag(diag::err_access_dtor_vbase) 3315 << VBase->getType()); 3316 3317 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3318 } 3319} 3320 3321void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3322 if (!CDtorDecl) 3323 return; 3324 3325 if (CXXConstructorDecl *Constructor 3326 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3327 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3328} 3329 3330bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3331 unsigned DiagID, AbstractDiagSelID SelID) { 3332 if (SelID == -1) 3333 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 3334 else 3335 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 3336} 3337 3338bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3339 const PartialDiagnostic &PD) { 3340 if (!getLangOptions().CPlusPlus) 3341 return false; 3342 3343 if (const ArrayType *AT = Context.getAsArrayType(T)) 3344 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3345 3346 if (const PointerType *PT = T->getAs<PointerType>()) { 3347 // Find the innermost pointer type. 3348 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3349 PT = T; 3350 3351 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3352 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3353 } 3354 3355 const RecordType *RT = T->getAs<RecordType>(); 3356 if (!RT) 3357 return false; 3358 3359 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3360 3361 // We can't answer whether something is abstract until it has a 3362 // definition. If it's currently being defined, we'll walk back 3363 // over all the declarations when we have a full definition. 3364 const CXXRecordDecl *Def = RD->getDefinition(); 3365 if (!Def || Def->isBeingDefined()) 3366 return false; 3367 3368 if (!RD->isAbstract()) 3369 return false; 3370 3371 Diag(Loc, PD) << RD->getDeclName(); 3372 DiagnoseAbstractType(RD); 3373 3374 return true; 3375} 3376 3377void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3378 // Check if we've already emitted the list of pure virtual functions 3379 // for this class. 3380 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3381 return; 3382 3383 CXXFinalOverriderMap FinalOverriders; 3384 RD->getFinalOverriders(FinalOverriders); 3385 3386 // Keep a set of seen pure methods so we won't diagnose the same method 3387 // more than once. 3388 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3389 3390 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3391 MEnd = FinalOverriders.end(); 3392 M != MEnd; 3393 ++M) { 3394 for (OverridingMethods::iterator SO = M->second.begin(), 3395 SOEnd = M->second.end(); 3396 SO != SOEnd; ++SO) { 3397 // C++ [class.abstract]p4: 3398 // A class is abstract if it contains or inherits at least one 3399 // pure virtual function for which the final overrider is pure 3400 // virtual. 3401 3402 // 3403 if (SO->second.size() != 1) 3404 continue; 3405 3406 if (!SO->second.front().Method->isPure()) 3407 continue; 3408 3409 if (!SeenPureMethods.insert(SO->second.front().Method)) 3410 continue; 3411 3412 Diag(SO->second.front().Method->getLocation(), 3413 diag::note_pure_virtual_function) 3414 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3415 } 3416 } 3417 3418 if (!PureVirtualClassDiagSet) 3419 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3420 PureVirtualClassDiagSet->insert(RD); 3421} 3422 3423namespace { 3424struct AbstractUsageInfo { 3425 Sema &S; 3426 CXXRecordDecl *Record; 3427 CanQualType AbstractType; 3428 bool Invalid; 3429 3430 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3431 : S(S), Record(Record), 3432 AbstractType(S.Context.getCanonicalType( 3433 S.Context.getTypeDeclType(Record))), 3434 Invalid(false) {} 3435 3436 void DiagnoseAbstractType() { 3437 if (Invalid) return; 3438 S.DiagnoseAbstractType(Record); 3439 Invalid = true; 3440 } 3441 3442 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3443}; 3444 3445struct CheckAbstractUsage { 3446 AbstractUsageInfo &Info; 3447 const NamedDecl *Ctx; 3448 3449 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3450 : Info(Info), Ctx(Ctx) {} 3451 3452 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3453 switch (TL.getTypeLocClass()) { 3454#define ABSTRACT_TYPELOC(CLASS, PARENT) 3455#define TYPELOC(CLASS, PARENT) \ 3456 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3457#include "clang/AST/TypeLocNodes.def" 3458 } 3459 } 3460 3461 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3462 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3463 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3464 if (!TL.getArg(I)) 3465 continue; 3466 3467 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3468 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3469 } 3470 } 3471 3472 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3473 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3474 } 3475 3476 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3477 // Visit the type parameters from a permissive context. 3478 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3479 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3480 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3481 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3482 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3483 // TODO: other template argument types? 3484 } 3485 } 3486 3487 // Visit pointee types from a permissive context. 3488#define CheckPolymorphic(Type) \ 3489 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3490 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3491 } 3492 CheckPolymorphic(PointerTypeLoc) 3493 CheckPolymorphic(ReferenceTypeLoc) 3494 CheckPolymorphic(MemberPointerTypeLoc) 3495 CheckPolymorphic(BlockPointerTypeLoc) 3496 CheckPolymorphic(AtomicTypeLoc) 3497 3498 /// Handle all the types we haven't given a more specific 3499 /// implementation for above. 3500 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3501 // Every other kind of type that we haven't called out already 3502 // that has an inner type is either (1) sugar or (2) contains that 3503 // inner type in some way as a subobject. 3504 if (TypeLoc Next = TL.getNextTypeLoc()) 3505 return Visit(Next, Sel); 3506 3507 // If there's no inner type and we're in a permissive context, 3508 // don't diagnose. 3509 if (Sel == Sema::AbstractNone) return; 3510 3511 // Check whether the type matches the abstract type. 3512 QualType T = TL.getType(); 3513 if (T->isArrayType()) { 3514 Sel = Sema::AbstractArrayType; 3515 T = Info.S.Context.getBaseElementType(T); 3516 } 3517 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3518 if (CT != Info.AbstractType) return; 3519 3520 // It matched; do some magic. 3521 if (Sel == Sema::AbstractArrayType) { 3522 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3523 << T << TL.getSourceRange(); 3524 } else { 3525 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3526 << Sel << T << TL.getSourceRange(); 3527 } 3528 Info.DiagnoseAbstractType(); 3529 } 3530}; 3531 3532void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3533 Sema::AbstractDiagSelID Sel) { 3534 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3535} 3536 3537} 3538 3539/// Check for invalid uses of an abstract type in a method declaration. 3540static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3541 CXXMethodDecl *MD) { 3542 // No need to do the check on definitions, which require that 3543 // the return/param types be complete. 3544 if (MD->doesThisDeclarationHaveABody()) 3545 return; 3546 3547 // For safety's sake, just ignore it if we don't have type source 3548 // information. This should never happen for non-implicit methods, 3549 // but... 3550 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3551 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3552} 3553 3554/// Check for invalid uses of an abstract type within a class definition. 3555static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3556 CXXRecordDecl *RD) { 3557 for (CXXRecordDecl::decl_iterator 3558 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3559 Decl *D = *I; 3560 if (D->isImplicit()) continue; 3561 3562 // Methods and method templates. 3563 if (isa<CXXMethodDecl>(D)) { 3564 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3565 } else if (isa<FunctionTemplateDecl>(D)) { 3566 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3567 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3568 3569 // Fields and static variables. 3570 } else if (isa<FieldDecl>(D)) { 3571 FieldDecl *FD = cast<FieldDecl>(D); 3572 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3573 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3574 } else if (isa<VarDecl>(D)) { 3575 VarDecl *VD = cast<VarDecl>(D); 3576 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3577 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3578 3579 // Nested classes and class templates. 3580 } else if (isa<CXXRecordDecl>(D)) { 3581 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3582 } else if (isa<ClassTemplateDecl>(D)) { 3583 CheckAbstractClassUsage(Info, 3584 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3585 } 3586 } 3587} 3588 3589/// \brief Perform semantic checks on a class definition that has been 3590/// completing, introducing implicitly-declared members, checking for 3591/// abstract types, etc. 3592void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3593 if (!Record) 3594 return; 3595 3596 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3597 AbstractUsageInfo Info(*this, Record); 3598 CheckAbstractClassUsage(Info, Record); 3599 } 3600 3601 // If this is not an aggregate type and has no user-declared constructor, 3602 // complain about any non-static data members of reference or const scalar 3603 // type, since they will never get initializers. 3604 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3605 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 3606 bool Complained = false; 3607 for (RecordDecl::field_iterator F = Record->field_begin(), 3608 FEnd = Record->field_end(); 3609 F != FEnd; ++F) { 3610 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3611 continue; 3612 3613 if (F->getType()->isReferenceType() || 3614 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3615 if (!Complained) { 3616 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3617 << Record->getTagKind() << Record; 3618 Complained = true; 3619 } 3620 3621 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3622 << F->getType()->isReferenceType() 3623 << F->getDeclName(); 3624 } 3625 } 3626 } 3627 3628 if (Record->isDynamicClass() && !Record->isDependentType()) 3629 DynamicClasses.push_back(Record); 3630 3631 if (Record->getIdentifier()) { 3632 // C++ [class.mem]p13: 3633 // If T is the name of a class, then each of the following shall have a 3634 // name different from T: 3635 // - every member of every anonymous union that is a member of class T. 3636 // 3637 // C++ [class.mem]p14: 3638 // In addition, if class T has a user-declared constructor (12.1), every 3639 // non-static data member of class T shall have a name different from T. 3640 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3641 R.first != R.second; ++R.first) { 3642 NamedDecl *D = *R.first; 3643 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3644 isa<IndirectFieldDecl>(D)) { 3645 Diag(D->getLocation(), diag::err_member_name_of_class) 3646 << D->getDeclName(); 3647 break; 3648 } 3649 } 3650 } 3651 3652 // Warn if the class has virtual methods but non-virtual public destructor. 3653 if (Record->isPolymorphic() && !Record->isDependentType()) { 3654 CXXDestructorDecl *dtor = Record->getDestructor(); 3655 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3656 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3657 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3658 } 3659 3660 // See if a method overloads virtual methods in a base 3661 /// class without overriding any. 3662 if (!Record->isDependentType()) { 3663 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3664 MEnd = Record->method_end(); 3665 M != MEnd; ++M) { 3666 if (!(*M)->isStatic()) 3667 DiagnoseHiddenVirtualMethods(Record, *M); 3668 } 3669 } 3670 3671 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3672 // function that is not a constructor declares that member function to be 3673 // const. [...] The class of which that function is a member shall be 3674 // a literal type. 3675 // 3676 // It's fine to diagnose constructors here too: such constructors cannot 3677 // produce a constant expression, so are ill-formed (no diagnostic required). 3678 // 3679 // If the class has virtual bases, any constexpr members will already have 3680 // been diagnosed by the checks performed on the member declaration, so 3681 // suppress this (less useful) diagnostic. 3682 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3683 !Record->isLiteral() && !Record->getNumVBases()) { 3684 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3685 MEnd = Record->method_end(); 3686 M != MEnd; ++M) { 3687 if (M->isConstexpr() && M->isInstance()) { 3688 switch (Record->getTemplateSpecializationKind()) { 3689 case TSK_ImplicitInstantiation: 3690 case TSK_ExplicitInstantiationDeclaration: 3691 case TSK_ExplicitInstantiationDefinition: 3692 // If a template instantiates to a non-literal type, but its members 3693 // instantiate to constexpr functions, the template is technically 3694 // ill-formed, but we allow it for sanity. Such members are treated as 3695 // non-constexpr. 3696 (*M)->setConstexpr(false); 3697 continue; 3698 3699 case TSK_Undeclared: 3700 case TSK_ExplicitSpecialization: 3701 RequireLiteralType((*M)->getLocation(), Context.getRecordType(Record), 3702 PDiag(diag::err_constexpr_method_non_literal)); 3703 break; 3704 } 3705 3706 // Only produce one error per class. 3707 break; 3708 } 3709 } 3710 } 3711 3712 // Declare inherited constructors. We do this eagerly here because: 3713 // - The standard requires an eager diagnostic for conflicting inherited 3714 // constructors from different classes. 3715 // - The lazy declaration of the other implicit constructors is so as to not 3716 // waste space and performance on classes that are not meant to be 3717 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3718 // have inherited constructors. 3719 DeclareInheritedConstructors(Record); 3720 3721 if (!Record->isDependentType()) 3722 CheckExplicitlyDefaultedMethods(Record); 3723} 3724 3725void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3726 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3727 ME = Record->method_end(); 3728 MI != ME; ++MI) { 3729 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3730 switch (getSpecialMember(*MI)) { 3731 case CXXDefaultConstructor: 3732 CheckExplicitlyDefaultedDefaultConstructor( 3733 cast<CXXConstructorDecl>(*MI)); 3734 break; 3735 3736 case CXXDestructor: 3737 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3738 break; 3739 3740 case CXXCopyConstructor: 3741 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3742 break; 3743 3744 case CXXCopyAssignment: 3745 CheckExplicitlyDefaultedCopyAssignment(*MI); 3746 break; 3747 3748 case CXXMoveConstructor: 3749 CheckExplicitlyDefaultedMoveConstructor(cast<CXXConstructorDecl>(*MI)); 3750 break; 3751 3752 case CXXMoveAssignment: 3753 CheckExplicitlyDefaultedMoveAssignment(*MI); 3754 break; 3755 3756 case CXXInvalid: 3757 llvm_unreachable("non-special member explicitly defaulted!"); 3758 } 3759 } 3760 } 3761 3762} 3763 3764void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3765 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3766 3767 // Whether this was the first-declared instance of the constructor. 3768 // This affects whether we implicitly add an exception spec (and, eventually, 3769 // constexpr). It is also ill-formed to explicitly default a constructor such 3770 // that it would be deleted. (C++0x [decl.fct.def.default]) 3771 bool First = CD == CD->getCanonicalDecl(); 3772 3773 bool HadError = false; 3774 if (CD->getNumParams() != 0) { 3775 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3776 << CD->getSourceRange(); 3777 HadError = true; 3778 } 3779 3780 ImplicitExceptionSpecification Spec 3781 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3782 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3783 if (EPI.ExceptionSpecType == EST_Delayed) { 3784 // Exception specification depends on some deferred part of the class. We'll 3785 // try again when the class's definition has been fully processed. 3786 return; 3787 } 3788 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3789 *ExceptionType = Context.getFunctionType( 3790 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3791 3792 // C++11 [dcl.fct.def.default]p2: 3793 // An explicitly-defaulted function may be declared constexpr only if it 3794 // would have been implicitly declared as constexpr, 3795 if (CD->isConstexpr()) { 3796 if (!CD->getParent()->defaultedDefaultConstructorIsConstexpr()) { 3797 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3798 << CXXDefaultConstructor; 3799 HadError = true; 3800 } 3801 } 3802 // and may have an explicit exception-specification only if it is compatible 3803 // with the exception-specification on the implicit declaration. 3804 if (CtorType->hasExceptionSpec()) { 3805 if (CheckEquivalentExceptionSpec( 3806 PDiag(diag::err_incorrect_defaulted_exception_spec) 3807 << CXXDefaultConstructor, 3808 PDiag(), 3809 ExceptionType, SourceLocation(), 3810 CtorType, CD->getLocation())) { 3811 HadError = true; 3812 } 3813 } 3814 3815 // If a function is explicitly defaulted on its first declaration, 3816 if (First) { 3817 // -- it is implicitly considered to be constexpr if the implicit 3818 // definition would be, 3819 CD->setConstexpr(CD->getParent()->defaultedDefaultConstructorIsConstexpr()); 3820 3821 // -- it is implicitly considered to have the same 3822 // exception-specification as if it had been implicitly declared 3823 // 3824 // FIXME: a compatible, but different, explicit exception specification 3825 // will be silently overridden. We should issue a warning if this happens. 3826 EPI.ExtInfo = CtorType->getExtInfo(); 3827 } 3828 3829 if (HadError) { 3830 CD->setInvalidDecl(); 3831 return; 3832 } 3833 3834 if (ShouldDeleteSpecialMember(CD, CXXDefaultConstructor)) { 3835 if (First) { 3836 CD->setDeletedAsWritten(); 3837 } else { 3838 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3839 << CXXDefaultConstructor; 3840 CD->setInvalidDecl(); 3841 } 3842 } 3843} 3844 3845void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3846 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3847 3848 // Whether this was the first-declared instance of the constructor. 3849 bool First = CD == CD->getCanonicalDecl(); 3850 3851 bool HadError = false; 3852 if (CD->getNumParams() != 1) { 3853 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3854 << CD->getSourceRange(); 3855 HadError = true; 3856 } 3857 3858 ImplicitExceptionSpecification Spec(Context); 3859 bool Const; 3860 llvm::tie(Spec, Const) = 3861 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3862 3863 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3864 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3865 *ExceptionType = Context.getFunctionType( 3866 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3867 3868 // Check for parameter type matching. 3869 // This is a copy ctor so we know it's a cv-qualified reference to T. 3870 QualType ArgType = CtorType->getArgType(0); 3871 if (ArgType->getPointeeType().isVolatileQualified()) { 3872 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3873 HadError = true; 3874 } 3875 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3876 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3877 HadError = true; 3878 } 3879 3880 // C++11 [dcl.fct.def.default]p2: 3881 // An explicitly-defaulted function may be declared constexpr only if it 3882 // would have been implicitly declared as constexpr, 3883 if (CD->isConstexpr()) { 3884 if (!CD->getParent()->defaultedCopyConstructorIsConstexpr()) { 3885 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3886 << CXXCopyConstructor; 3887 HadError = true; 3888 } 3889 } 3890 // and may have an explicit exception-specification only if it is compatible 3891 // with the exception-specification on the implicit declaration. 3892 if (CtorType->hasExceptionSpec()) { 3893 if (CheckEquivalentExceptionSpec( 3894 PDiag(diag::err_incorrect_defaulted_exception_spec) 3895 << CXXCopyConstructor, 3896 PDiag(), 3897 ExceptionType, SourceLocation(), 3898 CtorType, CD->getLocation())) { 3899 HadError = true; 3900 } 3901 } 3902 3903 // If a function is explicitly defaulted on its first declaration, 3904 if (First) { 3905 // -- it is implicitly considered to be constexpr if the implicit 3906 // definition would be, 3907 CD->setConstexpr(CD->getParent()->defaultedCopyConstructorIsConstexpr()); 3908 3909 // -- it is implicitly considered to have the same 3910 // exception-specification as if it had been implicitly declared, and 3911 // 3912 // FIXME: a compatible, but different, explicit exception specification 3913 // will be silently overridden. We should issue a warning if this happens. 3914 EPI.ExtInfo = CtorType->getExtInfo(); 3915 3916 // -- [...] it shall have the same parameter type as if it had been 3917 // implicitly declared. 3918 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3919 } 3920 3921 if (HadError) { 3922 CD->setInvalidDecl(); 3923 return; 3924 } 3925 3926 if (ShouldDeleteSpecialMember(CD, CXXCopyConstructor)) { 3927 if (First) { 3928 CD->setDeletedAsWritten(); 3929 } else { 3930 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3931 << CXXCopyConstructor; 3932 CD->setInvalidDecl(); 3933 } 3934 } 3935} 3936 3937void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3938 assert(MD->isExplicitlyDefaulted()); 3939 3940 // Whether this was the first-declared instance of the operator 3941 bool First = MD == MD->getCanonicalDecl(); 3942 3943 bool HadError = false; 3944 if (MD->getNumParams() != 1) { 3945 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3946 << MD->getSourceRange(); 3947 HadError = true; 3948 } 3949 3950 QualType ReturnType = 3951 MD->getType()->getAs<FunctionType>()->getResultType(); 3952 if (!ReturnType->isLValueReferenceType() || 3953 !Context.hasSameType( 3954 Context.getCanonicalType(ReturnType->getPointeeType()), 3955 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3956 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3957 HadError = true; 3958 } 3959 3960 ImplicitExceptionSpecification Spec(Context); 3961 bool Const; 3962 llvm::tie(Spec, Const) = 3963 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 3964 3965 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3966 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3967 *ExceptionType = Context.getFunctionType( 3968 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3969 3970 QualType ArgType = OperType->getArgType(0); 3971 if (!ArgType->isLValueReferenceType()) { 3972 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 3973 HadError = true; 3974 } else { 3975 if (ArgType->getPointeeType().isVolatileQualified()) { 3976 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 3977 HadError = true; 3978 } 3979 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3980 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 3981 HadError = true; 3982 } 3983 } 3984 3985 if (OperType->getTypeQuals()) { 3986 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 3987 HadError = true; 3988 } 3989 3990 if (OperType->hasExceptionSpec()) { 3991 if (CheckEquivalentExceptionSpec( 3992 PDiag(diag::err_incorrect_defaulted_exception_spec) 3993 << CXXCopyAssignment, 3994 PDiag(), 3995 ExceptionType, SourceLocation(), 3996 OperType, MD->getLocation())) { 3997 HadError = true; 3998 } 3999 } 4000 if (First) { 4001 // We set the declaration to have the computed exception spec here. 4002 // We duplicate the one parameter type. 4003 EPI.RefQualifier = OperType->getRefQualifier(); 4004 EPI.ExtInfo = OperType->getExtInfo(); 4005 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4006 } 4007 4008 if (HadError) { 4009 MD->setInvalidDecl(); 4010 return; 4011 } 4012 4013 if (ShouldDeleteCopyAssignmentOperator(MD)) { 4014 if (First) { 4015 MD->setDeletedAsWritten(); 4016 } else { 4017 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4018 << CXXCopyAssignment; 4019 MD->setInvalidDecl(); 4020 } 4021 } 4022} 4023 4024void Sema::CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *CD) { 4025 assert(CD->isExplicitlyDefaulted() && CD->isMoveConstructor()); 4026 4027 // Whether this was the first-declared instance of the constructor. 4028 bool First = CD == CD->getCanonicalDecl(); 4029 4030 bool HadError = false; 4031 if (CD->getNumParams() != 1) { 4032 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_params) 4033 << CD->getSourceRange(); 4034 HadError = true; 4035 } 4036 4037 ImplicitExceptionSpecification Spec( 4038 ComputeDefaultedMoveCtorExceptionSpec(CD->getParent())); 4039 4040 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4041 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 4042 *ExceptionType = Context.getFunctionType( 4043 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4044 4045 // Check for parameter type matching. 4046 // This is a move ctor so we know it's a cv-qualified rvalue reference to T. 4047 QualType ArgType = CtorType->getArgType(0); 4048 if (ArgType->getPointeeType().isVolatileQualified()) { 4049 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_volatile_param); 4050 HadError = true; 4051 } 4052 if (ArgType->getPointeeType().isConstQualified()) { 4053 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_const_param); 4054 HadError = true; 4055 } 4056 4057 // C++11 [dcl.fct.def.default]p2: 4058 // An explicitly-defaulted function may be declared constexpr only if it 4059 // would have been implicitly declared as constexpr, 4060 if (CD->isConstexpr()) { 4061 if (!CD->getParent()->defaultedMoveConstructorIsConstexpr()) { 4062 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 4063 << CXXMoveConstructor; 4064 HadError = true; 4065 } 4066 } 4067 // and may have an explicit exception-specification only if it is compatible 4068 // with the exception-specification on the implicit declaration. 4069 if (CtorType->hasExceptionSpec()) { 4070 if (CheckEquivalentExceptionSpec( 4071 PDiag(diag::err_incorrect_defaulted_exception_spec) 4072 << CXXMoveConstructor, 4073 PDiag(), 4074 ExceptionType, SourceLocation(), 4075 CtorType, CD->getLocation())) { 4076 HadError = true; 4077 } 4078 } 4079 4080 // If a function is explicitly defaulted on its first declaration, 4081 if (First) { 4082 // -- it is implicitly considered to be constexpr if the implicit 4083 // definition would be, 4084 CD->setConstexpr(CD->getParent()->defaultedMoveConstructorIsConstexpr()); 4085 4086 // -- it is implicitly considered to have the same 4087 // exception-specification as if it had been implicitly declared, and 4088 // 4089 // FIXME: a compatible, but different, explicit exception specification 4090 // will be silently overridden. We should issue a warning if this happens. 4091 EPI.ExtInfo = CtorType->getExtInfo(); 4092 4093 // -- [...] it shall have the same parameter type as if it had been 4094 // implicitly declared. 4095 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 4096 } 4097 4098 if (HadError) { 4099 CD->setInvalidDecl(); 4100 return; 4101 } 4102 4103 if (ShouldDeleteSpecialMember(CD, CXXMoveConstructor)) { 4104 if (First) { 4105 CD->setDeletedAsWritten(); 4106 } else { 4107 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 4108 << CXXMoveConstructor; 4109 CD->setInvalidDecl(); 4110 } 4111 } 4112} 4113 4114void Sema::CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *MD) { 4115 assert(MD->isExplicitlyDefaulted()); 4116 4117 // Whether this was the first-declared instance of the operator 4118 bool First = MD == MD->getCanonicalDecl(); 4119 4120 bool HadError = false; 4121 if (MD->getNumParams() != 1) { 4122 Diag(MD->getLocation(), diag::err_defaulted_move_assign_params) 4123 << MD->getSourceRange(); 4124 HadError = true; 4125 } 4126 4127 QualType ReturnType = 4128 MD->getType()->getAs<FunctionType>()->getResultType(); 4129 if (!ReturnType->isLValueReferenceType() || 4130 !Context.hasSameType( 4131 Context.getCanonicalType(ReturnType->getPointeeType()), 4132 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 4133 Diag(MD->getLocation(), diag::err_defaulted_move_assign_return_type); 4134 HadError = true; 4135 } 4136 4137 ImplicitExceptionSpecification Spec( 4138 ComputeDefaultedMoveCtorExceptionSpec(MD->getParent())); 4139 4140 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4141 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4142 *ExceptionType = Context.getFunctionType( 4143 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4144 4145 QualType ArgType = OperType->getArgType(0); 4146 if (!ArgType->isRValueReferenceType()) { 4147 Diag(MD->getLocation(), diag::err_defaulted_move_assign_not_ref); 4148 HadError = true; 4149 } else { 4150 if (ArgType->getPointeeType().isVolatileQualified()) { 4151 Diag(MD->getLocation(), diag::err_defaulted_move_assign_volatile_param); 4152 HadError = true; 4153 } 4154 if (ArgType->getPointeeType().isConstQualified()) { 4155 Diag(MD->getLocation(), diag::err_defaulted_move_assign_const_param); 4156 HadError = true; 4157 } 4158 } 4159 4160 if (OperType->getTypeQuals()) { 4161 Diag(MD->getLocation(), diag::err_defaulted_move_assign_quals); 4162 HadError = true; 4163 } 4164 4165 if (OperType->hasExceptionSpec()) { 4166 if (CheckEquivalentExceptionSpec( 4167 PDiag(diag::err_incorrect_defaulted_exception_spec) 4168 << CXXMoveAssignment, 4169 PDiag(), 4170 ExceptionType, SourceLocation(), 4171 OperType, MD->getLocation())) { 4172 HadError = true; 4173 } 4174 } 4175 if (First) { 4176 // We set the declaration to have the computed exception spec here. 4177 // We duplicate the one parameter type. 4178 EPI.RefQualifier = OperType->getRefQualifier(); 4179 EPI.ExtInfo = OperType->getExtInfo(); 4180 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4181 } 4182 4183 if (HadError) { 4184 MD->setInvalidDecl(); 4185 return; 4186 } 4187 4188 if (ShouldDeleteMoveAssignmentOperator(MD)) { 4189 if (First) { 4190 MD->setDeletedAsWritten(); 4191 } else { 4192 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4193 << CXXMoveAssignment; 4194 MD->setInvalidDecl(); 4195 } 4196 } 4197} 4198 4199void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 4200 assert(DD->isExplicitlyDefaulted()); 4201 4202 // Whether this was the first-declared instance of the destructor. 4203 bool First = DD == DD->getCanonicalDecl(); 4204 4205 ImplicitExceptionSpecification Spec 4206 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 4207 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4208 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 4209 *ExceptionType = Context.getFunctionType( 4210 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4211 4212 if (DtorType->hasExceptionSpec()) { 4213 if (CheckEquivalentExceptionSpec( 4214 PDiag(diag::err_incorrect_defaulted_exception_spec) 4215 << CXXDestructor, 4216 PDiag(), 4217 ExceptionType, SourceLocation(), 4218 DtorType, DD->getLocation())) { 4219 DD->setInvalidDecl(); 4220 return; 4221 } 4222 } 4223 if (First) { 4224 // We set the declaration to have the computed exception spec here. 4225 // There are no parameters. 4226 EPI.ExtInfo = DtorType->getExtInfo(); 4227 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 4228 } 4229 4230 if (ShouldDeleteDestructor(DD)) { 4231 if (First) { 4232 DD->setDeletedAsWritten(); 4233 } else { 4234 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 4235 << CXXDestructor; 4236 DD->setInvalidDecl(); 4237 } 4238 } 4239} 4240 4241/// This function implements the following C++0x paragraphs: 4242/// - [class.ctor]/5 4243/// - [class.copy]/11 4244bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM) { 4245 assert(!MD->isInvalidDecl()); 4246 CXXRecordDecl *RD = MD->getParent(); 4247 assert(!RD->isDependentType() && "do deletion after instantiation"); 4248 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4249 return false; 4250 4251 bool IsUnion = RD->isUnion(); 4252 bool IsConstructor = false; 4253 bool IsAssignment = false; 4254 bool IsMove = false; 4255 4256 bool ConstArg = false; 4257 4258 switch (CSM) { 4259 case CXXDefaultConstructor: 4260 IsConstructor = true; 4261 break; 4262 case CXXCopyConstructor: 4263 IsConstructor = true; 4264 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4265 break; 4266 case CXXMoveConstructor: 4267 IsConstructor = true; 4268 IsMove = true; 4269 break; 4270 default: 4271 llvm_unreachable("function only currently implemented for default ctors"); 4272 } 4273 4274 SourceLocation Loc = MD->getLocation(); 4275 4276 // Do access control from the special member function 4277 ContextRAII MethodContext(*this, MD); 4278 4279 bool AllConst = true; 4280 4281 // We do this because we should never actually use an anonymous 4282 // union's constructor. 4283 if (IsUnion && RD->isAnonymousStructOrUnion()) 4284 return false; 4285 4286 // FIXME: We should put some diagnostic logic right into this function. 4287 4288 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4289 BE = RD->bases_end(); 4290 BI != BE; ++BI) { 4291 // We'll handle this one later 4292 if (BI->isVirtual()) 4293 continue; 4294 4295 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4296 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4297 4298 // Unless we have an assignment operator, the base's destructor must 4299 // be accessible and not deleted. 4300 if (!IsAssignment) { 4301 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4302 if (BaseDtor->isDeleted()) 4303 return true; 4304 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4305 AR_accessible) 4306 return true; 4307 } 4308 4309 // Finding the corresponding member in the base should lead to a 4310 // unique, accessible, non-deleted function. If we are doing 4311 // a destructor, we have already checked this case. 4312 if (CSM != CXXDestructor) { 4313 SpecialMemberOverloadResult *SMOR = 4314 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, false, false, 4315 false); 4316 if (!SMOR->hasSuccess()) 4317 return true; 4318 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4319 if (IsConstructor) { 4320 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4321 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4322 PDiag()) != AR_accessible) 4323 return true; 4324 4325 // For a move operation, the corresponding operation must actually 4326 // be a move operation (and not a copy selected by overload 4327 // resolution) unless we are working on a trivially copyable class. 4328 if (IsMove && !BaseCtor->isMoveConstructor() && 4329 !BaseDecl->isTriviallyCopyable()) 4330 return true; 4331 } 4332 } 4333 } 4334 4335 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4336 BE = RD->vbases_end(); 4337 BI != BE; ++BI) { 4338 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4339 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4340 4341 // Unless we have an assignment operator, the base's destructor must 4342 // be accessible and not deleted. 4343 if (!IsAssignment) { 4344 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4345 if (BaseDtor->isDeleted()) 4346 return true; 4347 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4348 AR_accessible) 4349 return true; 4350 } 4351 4352 // Finding the corresponding member in the base should lead to a 4353 // unique, accessible, non-deleted function. 4354 if (CSM != CXXDestructor) { 4355 SpecialMemberOverloadResult *SMOR = 4356 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, false, false, 4357 false); 4358 if (!SMOR->hasSuccess()) 4359 return true; 4360 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4361 if (IsConstructor) { 4362 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4363 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4364 PDiag()) != AR_accessible) 4365 return true; 4366 4367 // For a move operation, the corresponding operation must actually 4368 // be a move operation (and not a copy selected by overload 4369 // resolution) unless we are working on a trivially copyable class. 4370 if (IsMove && !BaseCtor->isMoveConstructor() && 4371 !BaseDecl->isTriviallyCopyable()) 4372 return true; 4373 } 4374 } 4375 } 4376 4377 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4378 FE = RD->field_end(); 4379 FI != FE; ++FI) { 4380 if (FI->isInvalidDecl() || FI->isUnnamedBitfield()) 4381 continue; 4382 4383 QualType FieldType = Context.getBaseElementType(FI->getType()); 4384 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4385 4386 // For a default constructor, all references must be initialized in-class 4387 // and, if a union, it must have a non-const member. 4388 if (CSM == CXXDefaultConstructor) { 4389 if (FieldType->isReferenceType() && !FI->hasInClassInitializer()) 4390 return true; 4391 4392 if (IsUnion && !FieldType.isConstQualified()) 4393 AllConst = false; 4394 // For a copy constructor, data members must not be of rvalue reference 4395 // type. 4396 } else if (CSM == CXXCopyConstructor) { 4397 if (FieldType->isRValueReferenceType()) 4398 return true; 4399 } 4400 4401 if (FieldRecord) { 4402 // For a default constructor, a const member must have a user-provided 4403 // default constructor or else be explicitly initialized. 4404 if (CSM == CXXDefaultConstructor && FieldType.isConstQualified() && 4405 !FI->hasInClassInitializer() && 4406 !FieldRecord->hasUserProvidedDefaultConstructor()) 4407 return true; 4408 4409 // Some additional restrictions exist on the variant members. 4410 if (!IsUnion && FieldRecord->isUnion() && 4411 FieldRecord->isAnonymousStructOrUnion()) { 4412 // We're okay to reuse AllConst here since we only care about the 4413 // value otherwise if we're in a union. 4414 AllConst = true; 4415 4416 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4417 UE = FieldRecord->field_end(); 4418 UI != UE; ++UI) { 4419 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4420 CXXRecordDecl *UnionFieldRecord = 4421 UnionFieldType->getAsCXXRecordDecl(); 4422 4423 if (!UnionFieldType.isConstQualified()) 4424 AllConst = false; 4425 4426 if (UnionFieldRecord) { 4427 // FIXME: Checking for accessibility and validity of this 4428 // destructor is technically going beyond the 4429 // standard, but this is believed to be a defect. 4430 if (!IsAssignment) { 4431 CXXDestructorDecl *FieldDtor = LookupDestructor(UnionFieldRecord); 4432 if (FieldDtor->isDeleted()) 4433 return true; 4434 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4435 AR_accessible) 4436 return true; 4437 if (!FieldDtor->isTrivial()) 4438 return true; 4439 } 4440 4441 if (CSM != CXXDestructor) { 4442 SpecialMemberOverloadResult *SMOR = 4443 LookupSpecialMember(UnionFieldRecord, CSM, ConstArg, false, 4444 false, false, false); 4445 // FIXME: Checking for accessibility and validity of this 4446 // corresponding member is technically going beyond the 4447 // standard, but this is believed to be a defect. 4448 if (!SMOR->hasSuccess()) 4449 return true; 4450 4451 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4452 // A member of a union must have a trivial corresponding 4453 // constructor. 4454 if (!FieldMember->isTrivial()) 4455 return true; 4456 4457 if (IsConstructor) { 4458 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4459 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4460 PDiag()) != AR_accessible) 4461 return true; 4462 } 4463 } 4464 } 4465 } 4466 4467 // At least one member in each anonymous union must be non-const 4468 if (CSM == CXXDefaultConstructor && AllConst) 4469 return true; 4470 4471 // Don't try to initialize the anonymous union 4472 // This is technically non-conformant, but sanity demands it. 4473 continue; 4474 } 4475 4476 // Unless we're doing assignment, the field's destructor must be 4477 // accessible and not deleted. 4478 if (!IsAssignment) { 4479 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4480 if (FieldDtor->isDeleted()) 4481 return true; 4482 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4483 AR_accessible) 4484 return true; 4485 } 4486 4487 // Check that the corresponding member of the field is accessible, 4488 // unique, and non-deleted. We don't do this if it has an explicit 4489 // initialization when default-constructing. 4490 if (CSM != CXXDestructor && 4491 (CSM != CXXDefaultConstructor || !FI->hasInClassInitializer())) { 4492 SpecialMemberOverloadResult *SMOR = 4493 LookupSpecialMember(FieldRecord, CSM, ConstArg, false, false, false, 4494 false); 4495 if (!SMOR->hasSuccess()) 4496 return true; 4497 4498 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4499 if (IsConstructor) { 4500 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4501 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4502 PDiag()) != AR_accessible) 4503 return true; 4504 4505 // For a move operation, the corresponding operation must actually 4506 // be a move operation (and not a copy selected by overload 4507 // resolution) unless we are working on a trivially copyable class. 4508 if (IsMove && !FieldCtor->isMoveConstructor() && 4509 !FieldRecord->isTriviallyCopyable()) 4510 return true; 4511 } 4512 4513 // We need the corresponding member of a union to be trivial so that 4514 // we can safely copy them all simultaneously. 4515 // FIXME: Note that performing the check here (where we rely on the lack 4516 // of an in-class initializer) is technically ill-formed. However, this 4517 // seems most obviously to be a bug in the standard. 4518 if (IsUnion && !FieldMember->isTrivial()) 4519 return true; 4520 } 4521 } else if (CSM == CXXDefaultConstructor && !IsUnion && 4522 FieldType.isConstQualified() && !FI->hasInClassInitializer()) { 4523 // We can't initialize a const member of non-class type to any value. 4524 return true; 4525 } 4526 } 4527 4528 // We can't have all const members in a union when default-constructing, 4529 // or else they're all nonsensical garbage values that can't be changed. 4530 if (CSM == CXXDefaultConstructor && IsUnion && AllConst) 4531 return true; 4532 4533 return false; 4534} 4535 4536bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) { 4537 CXXRecordDecl *RD = MD->getParent(); 4538 assert(!RD->isDependentType() && "do deletion after instantiation"); 4539 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4540 return false; 4541 4542 SourceLocation Loc = MD->getLocation(); 4543 4544 // Do access control from the constructor 4545 ContextRAII MethodContext(*this, MD); 4546 4547 bool Union = RD->isUnion(); 4548 4549 unsigned ArgQuals = 4550 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 4551 Qualifiers::Const : 0; 4552 4553 // We do this because we should never actually use an anonymous 4554 // union's constructor. 4555 if (Union && RD->isAnonymousStructOrUnion()) 4556 return false; 4557 4558 // FIXME: We should put some diagnostic logic right into this function. 4559 4560 // C++0x [class.copy]/20 4561 // A defaulted [copy] assignment operator for class X is defined as deleted 4562 // if X has: 4563 4564 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4565 BE = RD->bases_end(); 4566 BI != BE; ++BI) { 4567 // We'll handle this one later 4568 if (BI->isVirtual()) 4569 continue; 4570 4571 QualType BaseType = BI->getType(); 4572 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4573 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4574 4575 // -- a [direct base class] B that cannot be [copied] because overload 4576 // resolution, as applied to B's [copy] assignment operator, results in 4577 // an ambiguity or a function that is deleted or inaccessible from the 4578 // assignment operator 4579 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4580 0); 4581 if (!CopyOper || CopyOper->isDeleted()) 4582 return true; 4583 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4584 return true; 4585 } 4586 4587 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4588 BE = RD->vbases_end(); 4589 BI != BE; ++BI) { 4590 QualType BaseType = BI->getType(); 4591 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4592 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4593 4594 // -- a [virtual base class] B that cannot be [copied] because overload 4595 // resolution, as applied to B's [copy] assignment operator, results in 4596 // an ambiguity or a function that is deleted or inaccessible from the 4597 // assignment operator 4598 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4599 0); 4600 if (!CopyOper || CopyOper->isDeleted()) 4601 return true; 4602 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4603 return true; 4604 } 4605 4606 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4607 FE = RD->field_end(); 4608 FI != FE; ++FI) { 4609 if (FI->isUnnamedBitfield()) 4610 continue; 4611 4612 QualType FieldType = Context.getBaseElementType(FI->getType()); 4613 4614 // -- a non-static data member of reference type 4615 if (FieldType->isReferenceType()) 4616 return true; 4617 4618 // -- a non-static data member of const non-class type (or array thereof) 4619 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4620 return true; 4621 4622 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4623 4624 if (FieldRecord) { 4625 // This is an anonymous union 4626 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4627 // Anonymous unions inside unions do not variant members create 4628 if (!Union) { 4629 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4630 UE = FieldRecord->field_end(); 4631 UI != UE; ++UI) { 4632 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4633 CXXRecordDecl *UnionFieldRecord = 4634 UnionFieldType->getAsCXXRecordDecl(); 4635 4636 // -- a variant member with a non-trivial [copy] assignment operator 4637 // and X is a union-like class 4638 if (UnionFieldRecord && 4639 !UnionFieldRecord->hasTrivialCopyAssignment()) 4640 return true; 4641 } 4642 } 4643 4644 // Don't try to initalize an anonymous union 4645 continue; 4646 // -- a variant member with a non-trivial [copy] assignment operator 4647 // and X is a union-like class 4648 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 4649 return true; 4650 } 4651 4652 CXXMethodDecl *CopyOper = LookupCopyingAssignment(FieldRecord, ArgQuals, 4653 false, 0); 4654 if (!CopyOper || CopyOper->isDeleted()) 4655 return true; 4656 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4657 return true; 4658 } 4659 } 4660 4661 return false; 4662} 4663 4664bool Sema::ShouldDeleteMoveAssignmentOperator(CXXMethodDecl *MD) { 4665 CXXRecordDecl *RD = MD->getParent(); 4666 assert(!RD->isDependentType() && "do deletion after instantiation"); 4667 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4668 return false; 4669 4670 SourceLocation Loc = MD->getLocation(); 4671 4672 // Do access control from the constructor 4673 ContextRAII MethodContext(*this, MD); 4674 4675 bool Union = RD->isUnion(); 4676 4677 // We do this because we should never actually use an anonymous 4678 // union's constructor. 4679 if (Union && RD->isAnonymousStructOrUnion()) 4680 return false; 4681 4682 // C++0x [class.copy]/20 4683 // A defaulted [move] assignment operator for class X is defined as deleted 4684 // if X has: 4685 4686 // -- for the move constructor, [...] any direct or indirect virtual base 4687 // class. 4688 if (RD->getNumVBases() != 0) 4689 return true; 4690 4691 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4692 BE = RD->bases_end(); 4693 BI != BE; ++BI) { 4694 4695 QualType BaseType = BI->getType(); 4696 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4697 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4698 4699 // -- a [direct base class] B that cannot be [moved] because overload 4700 // resolution, as applied to B's [move] assignment operator, results in 4701 // an ambiguity or a function that is deleted or inaccessible from the 4702 // assignment operator 4703 CXXMethodDecl *MoveOper = LookupMovingAssignment(BaseDecl, false, 0); 4704 if (!MoveOper || MoveOper->isDeleted()) 4705 return true; 4706 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4707 return true; 4708 4709 // -- for the move assignment operator, a [direct base class] with a type 4710 // that does not have a move assignment operator and is not trivially 4711 // copyable. 4712 if (!MoveOper->isMoveAssignmentOperator() && 4713 !BaseDecl->isTriviallyCopyable()) 4714 return true; 4715 } 4716 4717 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4718 FE = RD->field_end(); 4719 FI != FE; ++FI) { 4720 if (FI->isUnnamedBitfield()) 4721 continue; 4722 4723 QualType FieldType = Context.getBaseElementType(FI->getType()); 4724 4725 // -- a non-static data member of reference type 4726 if (FieldType->isReferenceType()) 4727 return true; 4728 4729 // -- a non-static data member of const non-class type (or array thereof) 4730 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4731 return true; 4732 4733 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4734 4735 if (FieldRecord) { 4736 // This is an anonymous union 4737 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4738 // Anonymous unions inside unions do not variant members create 4739 if (!Union) { 4740 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4741 UE = FieldRecord->field_end(); 4742 UI != UE; ++UI) { 4743 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4744 CXXRecordDecl *UnionFieldRecord = 4745 UnionFieldType->getAsCXXRecordDecl(); 4746 4747 // -- a variant member with a non-trivial [move] assignment operator 4748 // and X is a union-like class 4749 if (UnionFieldRecord && 4750 !UnionFieldRecord->hasTrivialMoveAssignment()) 4751 return true; 4752 } 4753 } 4754 4755 // Don't try to initalize an anonymous union 4756 continue; 4757 // -- a variant member with a non-trivial [move] assignment operator 4758 // and X is a union-like class 4759 } else if (Union && !FieldRecord->hasTrivialMoveAssignment()) { 4760 return true; 4761 } 4762 4763 CXXMethodDecl *MoveOper = LookupMovingAssignment(FieldRecord, false, 0); 4764 if (!MoveOper || MoveOper->isDeleted()) 4765 return true; 4766 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4767 return true; 4768 4769 // -- for the move assignment operator, a [non-static data member] with a 4770 // type that does not have a move assignment operator and is not 4771 // trivially copyable. 4772 if (!MoveOper->isMoveAssignmentOperator() && 4773 !FieldRecord->isTriviallyCopyable()) 4774 return true; 4775 } 4776 } 4777 4778 return false; 4779} 4780 4781bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 4782 CXXRecordDecl *RD = DD->getParent(); 4783 assert(!RD->isDependentType() && "do deletion after instantiation"); 4784 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4785 return false; 4786 4787 SourceLocation Loc = DD->getLocation(); 4788 4789 // Do access control from the destructor 4790 ContextRAII CtorContext(*this, DD); 4791 4792 bool Union = RD->isUnion(); 4793 4794 // We do this because we should never actually use an anonymous 4795 // union's destructor. 4796 if (Union && RD->isAnonymousStructOrUnion()) 4797 return false; 4798 4799 // C++0x [class.dtor]p5 4800 // A defaulted destructor for a class X is defined as deleted if: 4801 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4802 BE = RD->bases_end(); 4803 BI != BE; ++BI) { 4804 // We'll handle this one later 4805 if (BI->isVirtual()) 4806 continue; 4807 4808 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4809 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4810 assert(BaseDtor && "base has no destructor"); 4811 4812 // -- any direct or virtual base class has a deleted destructor or 4813 // a destructor that is inaccessible from the defaulted destructor 4814 if (BaseDtor->isDeleted()) 4815 return true; 4816 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4817 AR_accessible) 4818 return true; 4819 } 4820 4821 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4822 BE = RD->vbases_end(); 4823 BI != BE; ++BI) { 4824 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4825 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4826 assert(BaseDtor && "base has no destructor"); 4827 4828 // -- any direct or virtual base class has a deleted destructor or 4829 // a destructor that is inaccessible from the defaulted destructor 4830 if (BaseDtor->isDeleted()) 4831 return true; 4832 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4833 AR_accessible) 4834 return true; 4835 } 4836 4837 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4838 FE = RD->field_end(); 4839 FI != FE; ++FI) { 4840 QualType FieldType = Context.getBaseElementType(FI->getType()); 4841 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4842 if (FieldRecord) { 4843 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4844 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4845 UE = FieldRecord->field_end(); 4846 UI != UE; ++UI) { 4847 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 4848 CXXRecordDecl *UnionFieldRecord = 4849 UnionFieldType->getAsCXXRecordDecl(); 4850 4851 // -- X is a union-like class that has a variant member with a non- 4852 // trivial destructor. 4853 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 4854 return true; 4855 } 4856 // Technically we are supposed to do this next check unconditionally. 4857 // But that makes absolutely no sense. 4858 } else { 4859 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4860 4861 // -- any of the non-static data members has class type M (or array 4862 // thereof) and M has a deleted destructor or a destructor that is 4863 // inaccessible from the defaulted destructor 4864 if (FieldDtor->isDeleted()) 4865 return true; 4866 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4867 AR_accessible) 4868 return true; 4869 4870 // -- X is a union-like class that has a variant member with a non- 4871 // trivial destructor. 4872 if (Union && !FieldDtor->isTrivial()) 4873 return true; 4874 } 4875 } 4876 } 4877 4878 if (DD->isVirtual()) { 4879 FunctionDecl *OperatorDelete = 0; 4880 DeclarationName Name = 4881 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4882 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete, 4883 false)) 4884 return true; 4885 } 4886 4887 4888 return false; 4889} 4890 4891/// \brief Data used with FindHiddenVirtualMethod 4892namespace { 4893 struct FindHiddenVirtualMethodData { 4894 Sema *S; 4895 CXXMethodDecl *Method; 4896 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4897 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4898 }; 4899} 4900 4901/// \brief Member lookup function that determines whether a given C++ 4902/// method overloads virtual methods in a base class without overriding any, 4903/// to be used with CXXRecordDecl::lookupInBases(). 4904static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4905 CXXBasePath &Path, 4906 void *UserData) { 4907 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4908 4909 FindHiddenVirtualMethodData &Data 4910 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4911 4912 DeclarationName Name = Data.Method->getDeclName(); 4913 assert(Name.getNameKind() == DeclarationName::Identifier); 4914 4915 bool foundSameNameMethod = false; 4916 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4917 for (Path.Decls = BaseRecord->lookup(Name); 4918 Path.Decls.first != Path.Decls.second; 4919 ++Path.Decls.first) { 4920 NamedDecl *D = *Path.Decls.first; 4921 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4922 MD = MD->getCanonicalDecl(); 4923 foundSameNameMethod = true; 4924 // Interested only in hidden virtual methods. 4925 if (!MD->isVirtual()) 4926 continue; 4927 // If the method we are checking overrides a method from its base 4928 // don't warn about the other overloaded methods. 4929 if (!Data.S->IsOverload(Data.Method, MD, false)) 4930 return true; 4931 // Collect the overload only if its hidden. 4932 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4933 overloadedMethods.push_back(MD); 4934 } 4935 } 4936 4937 if (foundSameNameMethod) 4938 Data.OverloadedMethods.append(overloadedMethods.begin(), 4939 overloadedMethods.end()); 4940 return foundSameNameMethod; 4941} 4942 4943/// \brief See if a method overloads virtual methods in a base class without 4944/// overriding any. 4945void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4946 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4947 MD->getLocation()) == DiagnosticsEngine::Ignored) 4948 return; 4949 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4950 return; 4951 4952 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4953 /*bool RecordPaths=*/false, 4954 /*bool DetectVirtual=*/false); 4955 FindHiddenVirtualMethodData Data; 4956 Data.Method = MD; 4957 Data.S = this; 4958 4959 // Keep the base methods that were overriden or introduced in the subclass 4960 // by 'using' in a set. A base method not in this set is hidden. 4961 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4962 res.first != res.second; ++res.first) { 4963 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4964 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4965 E = MD->end_overridden_methods(); 4966 I != E; ++I) 4967 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4968 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4969 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4970 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4971 } 4972 4973 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4974 !Data.OverloadedMethods.empty()) { 4975 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4976 << MD << (Data.OverloadedMethods.size() > 1); 4977 4978 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4979 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4980 Diag(overloadedMD->getLocation(), 4981 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4982 } 4983 } 4984} 4985 4986void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4987 Decl *TagDecl, 4988 SourceLocation LBrac, 4989 SourceLocation RBrac, 4990 AttributeList *AttrList) { 4991 if (!TagDecl) 4992 return; 4993 4994 AdjustDeclIfTemplate(TagDecl); 4995 4996 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4997 // strict aliasing violation! 4998 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4999 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 5000 5001 CheckCompletedCXXClass( 5002 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 5003} 5004 5005/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 5006/// special functions, such as the default constructor, copy 5007/// constructor, or destructor, to the given C++ class (C++ 5008/// [special]p1). This routine can only be executed just before the 5009/// definition of the class is complete. 5010void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 5011 if (!ClassDecl->hasUserDeclaredConstructor()) 5012 ++ASTContext::NumImplicitDefaultConstructors; 5013 5014 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 5015 ++ASTContext::NumImplicitCopyConstructors; 5016 5017 if (getLangOptions().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 5018 ++ASTContext::NumImplicitMoveConstructors; 5019 5020 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 5021 ++ASTContext::NumImplicitCopyAssignmentOperators; 5022 5023 // If we have a dynamic class, then the copy assignment operator may be 5024 // virtual, so we have to declare it immediately. This ensures that, e.g., 5025 // it shows up in the right place in the vtable and that we diagnose 5026 // problems with the implicit exception specification. 5027 if (ClassDecl->isDynamicClass()) 5028 DeclareImplicitCopyAssignment(ClassDecl); 5029 } 5030 5031 if (getLangOptions().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()){ 5032 ++ASTContext::NumImplicitMoveAssignmentOperators; 5033 5034 // Likewise for the move assignment operator. 5035 if (ClassDecl->isDynamicClass()) 5036 DeclareImplicitMoveAssignment(ClassDecl); 5037 } 5038 5039 if (!ClassDecl->hasUserDeclaredDestructor()) { 5040 ++ASTContext::NumImplicitDestructors; 5041 5042 // If we have a dynamic class, then the destructor may be virtual, so we 5043 // have to declare the destructor immediately. This ensures that, e.g., it 5044 // shows up in the right place in the vtable and that we diagnose problems 5045 // with the implicit exception specification. 5046 if (ClassDecl->isDynamicClass()) 5047 DeclareImplicitDestructor(ClassDecl); 5048 } 5049} 5050 5051void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 5052 if (!D) 5053 return; 5054 5055 int NumParamList = D->getNumTemplateParameterLists(); 5056 for (int i = 0; i < NumParamList; i++) { 5057 TemplateParameterList* Params = D->getTemplateParameterList(i); 5058 for (TemplateParameterList::iterator Param = Params->begin(), 5059 ParamEnd = Params->end(); 5060 Param != ParamEnd; ++Param) { 5061 NamedDecl *Named = cast<NamedDecl>(*Param); 5062 if (Named->getDeclName()) { 5063 S->AddDecl(Named); 5064 IdResolver.AddDecl(Named); 5065 } 5066 } 5067 } 5068} 5069 5070void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 5071 if (!D) 5072 return; 5073 5074 TemplateParameterList *Params = 0; 5075 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 5076 Params = Template->getTemplateParameters(); 5077 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 5078 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 5079 Params = PartialSpec->getTemplateParameters(); 5080 else 5081 return; 5082 5083 for (TemplateParameterList::iterator Param = Params->begin(), 5084 ParamEnd = Params->end(); 5085 Param != ParamEnd; ++Param) { 5086 NamedDecl *Named = cast<NamedDecl>(*Param); 5087 if (Named->getDeclName()) { 5088 S->AddDecl(Named); 5089 IdResolver.AddDecl(Named); 5090 } 5091 } 5092} 5093 5094void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5095 if (!RecordD) return; 5096 AdjustDeclIfTemplate(RecordD); 5097 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 5098 PushDeclContext(S, Record); 5099} 5100 5101void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5102 if (!RecordD) return; 5103 PopDeclContext(); 5104} 5105 5106/// ActOnStartDelayedCXXMethodDeclaration - We have completed 5107/// parsing a top-level (non-nested) C++ class, and we are now 5108/// parsing those parts of the given Method declaration that could 5109/// not be parsed earlier (C++ [class.mem]p2), such as default 5110/// arguments. This action should enter the scope of the given 5111/// Method declaration as if we had just parsed the qualified method 5112/// name. However, it should not bring the parameters into scope; 5113/// that will be performed by ActOnDelayedCXXMethodParameter. 5114void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5115} 5116 5117/// ActOnDelayedCXXMethodParameter - We've already started a delayed 5118/// C++ method declaration. We're (re-)introducing the given 5119/// function parameter into scope for use in parsing later parts of 5120/// the method declaration. For example, we could see an 5121/// ActOnParamDefaultArgument event for this parameter. 5122void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 5123 if (!ParamD) 5124 return; 5125 5126 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 5127 5128 // If this parameter has an unparsed default argument, clear it out 5129 // to make way for the parsed default argument. 5130 if (Param->hasUnparsedDefaultArg()) 5131 Param->setDefaultArg(0); 5132 5133 S->AddDecl(Param); 5134 if (Param->getDeclName()) 5135 IdResolver.AddDecl(Param); 5136} 5137 5138/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 5139/// processing the delayed method declaration for Method. The method 5140/// declaration is now considered finished. There may be a separate 5141/// ActOnStartOfFunctionDef action later (not necessarily 5142/// immediately!) for this method, if it was also defined inside the 5143/// class body. 5144void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5145 if (!MethodD) 5146 return; 5147 5148 AdjustDeclIfTemplate(MethodD); 5149 5150 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5151 5152 // Now that we have our default arguments, check the constructor 5153 // again. It could produce additional diagnostics or affect whether 5154 // the class has implicitly-declared destructors, among other 5155 // things. 5156 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5157 CheckConstructor(Constructor); 5158 5159 // Check the default arguments, which we may have added. 5160 if (!Method->isInvalidDecl()) 5161 CheckCXXDefaultArguments(Method); 5162} 5163 5164/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5165/// the well-formedness of the constructor declarator @p D with type @p 5166/// R. If there are any errors in the declarator, this routine will 5167/// emit diagnostics and set the invalid bit to true. In any case, the type 5168/// will be updated to reflect a well-formed type for the constructor and 5169/// returned. 5170QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5171 StorageClass &SC) { 5172 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5173 5174 // C++ [class.ctor]p3: 5175 // A constructor shall not be virtual (10.3) or static (9.4). A 5176 // constructor can be invoked for a const, volatile or const 5177 // volatile object. A constructor shall not be declared const, 5178 // volatile, or const volatile (9.3.2). 5179 if (isVirtual) { 5180 if (!D.isInvalidType()) 5181 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5182 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5183 << SourceRange(D.getIdentifierLoc()); 5184 D.setInvalidType(); 5185 } 5186 if (SC == SC_Static) { 5187 if (!D.isInvalidType()) 5188 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5189 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5190 << SourceRange(D.getIdentifierLoc()); 5191 D.setInvalidType(); 5192 SC = SC_None; 5193 } 5194 5195 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5196 if (FTI.TypeQuals != 0) { 5197 if (FTI.TypeQuals & Qualifiers::Const) 5198 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5199 << "const" << SourceRange(D.getIdentifierLoc()); 5200 if (FTI.TypeQuals & Qualifiers::Volatile) 5201 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5202 << "volatile" << SourceRange(D.getIdentifierLoc()); 5203 if (FTI.TypeQuals & Qualifiers::Restrict) 5204 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5205 << "restrict" << SourceRange(D.getIdentifierLoc()); 5206 D.setInvalidType(); 5207 } 5208 5209 // C++0x [class.ctor]p4: 5210 // A constructor shall not be declared with a ref-qualifier. 5211 if (FTI.hasRefQualifier()) { 5212 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5213 << FTI.RefQualifierIsLValueRef 5214 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5215 D.setInvalidType(); 5216 } 5217 5218 // Rebuild the function type "R" without any type qualifiers (in 5219 // case any of the errors above fired) and with "void" as the 5220 // return type, since constructors don't have return types. 5221 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5222 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5223 return R; 5224 5225 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5226 EPI.TypeQuals = 0; 5227 EPI.RefQualifier = RQ_None; 5228 5229 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5230 Proto->getNumArgs(), EPI); 5231} 5232 5233/// CheckConstructor - Checks a fully-formed constructor for 5234/// well-formedness, issuing any diagnostics required. Returns true if 5235/// the constructor declarator is invalid. 5236void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5237 CXXRecordDecl *ClassDecl 5238 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5239 if (!ClassDecl) 5240 return Constructor->setInvalidDecl(); 5241 5242 // C++ [class.copy]p3: 5243 // A declaration of a constructor for a class X is ill-formed if 5244 // its first parameter is of type (optionally cv-qualified) X and 5245 // either there are no other parameters or else all other 5246 // parameters have default arguments. 5247 if (!Constructor->isInvalidDecl() && 5248 ((Constructor->getNumParams() == 1) || 5249 (Constructor->getNumParams() > 1 && 5250 Constructor->getParamDecl(1)->hasDefaultArg())) && 5251 Constructor->getTemplateSpecializationKind() 5252 != TSK_ImplicitInstantiation) { 5253 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5254 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5255 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5256 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5257 const char *ConstRef 5258 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5259 : " const &"; 5260 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5261 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5262 5263 // FIXME: Rather that making the constructor invalid, we should endeavor 5264 // to fix the type. 5265 Constructor->setInvalidDecl(); 5266 } 5267 } 5268} 5269 5270/// CheckDestructor - Checks a fully-formed destructor definition for 5271/// well-formedness, issuing any diagnostics required. Returns true 5272/// on error. 5273bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5274 CXXRecordDecl *RD = Destructor->getParent(); 5275 5276 if (Destructor->isVirtual()) { 5277 SourceLocation Loc; 5278 5279 if (!Destructor->isImplicit()) 5280 Loc = Destructor->getLocation(); 5281 else 5282 Loc = RD->getLocation(); 5283 5284 // If we have a virtual destructor, look up the deallocation function 5285 FunctionDecl *OperatorDelete = 0; 5286 DeclarationName Name = 5287 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5288 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5289 return true; 5290 5291 MarkDeclarationReferenced(Loc, OperatorDelete); 5292 5293 Destructor->setOperatorDelete(OperatorDelete); 5294 } 5295 5296 return false; 5297} 5298 5299static inline bool 5300FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5301 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5302 FTI.ArgInfo[0].Param && 5303 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5304} 5305 5306/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5307/// the well-formednes of the destructor declarator @p D with type @p 5308/// R. If there are any errors in the declarator, this routine will 5309/// emit diagnostics and set the declarator to invalid. Even if this happens, 5310/// will be updated to reflect a well-formed type for the destructor and 5311/// returned. 5312QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5313 StorageClass& SC) { 5314 // C++ [class.dtor]p1: 5315 // [...] A typedef-name that names a class is a class-name 5316 // (7.1.3); however, a typedef-name that names a class shall not 5317 // be used as the identifier in the declarator for a destructor 5318 // declaration. 5319 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5320 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5321 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5322 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5323 else if (const TemplateSpecializationType *TST = 5324 DeclaratorType->getAs<TemplateSpecializationType>()) 5325 if (TST->isTypeAlias()) 5326 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5327 << DeclaratorType << 1; 5328 5329 // C++ [class.dtor]p2: 5330 // A destructor is used to destroy objects of its class type. A 5331 // destructor takes no parameters, and no return type can be 5332 // specified for it (not even void). The address of a destructor 5333 // shall not be taken. A destructor shall not be static. A 5334 // destructor can be invoked for a const, volatile or const 5335 // volatile object. A destructor shall not be declared const, 5336 // volatile or const volatile (9.3.2). 5337 if (SC == SC_Static) { 5338 if (!D.isInvalidType()) 5339 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5340 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5341 << SourceRange(D.getIdentifierLoc()) 5342 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5343 5344 SC = SC_None; 5345 } 5346 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5347 // Destructors don't have return types, but the parser will 5348 // happily parse something like: 5349 // 5350 // class X { 5351 // float ~X(); 5352 // }; 5353 // 5354 // The return type will be eliminated later. 5355 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5356 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5357 << SourceRange(D.getIdentifierLoc()); 5358 } 5359 5360 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5361 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5362 if (FTI.TypeQuals & Qualifiers::Const) 5363 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5364 << "const" << SourceRange(D.getIdentifierLoc()); 5365 if (FTI.TypeQuals & Qualifiers::Volatile) 5366 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5367 << "volatile" << SourceRange(D.getIdentifierLoc()); 5368 if (FTI.TypeQuals & Qualifiers::Restrict) 5369 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5370 << "restrict" << SourceRange(D.getIdentifierLoc()); 5371 D.setInvalidType(); 5372 } 5373 5374 // C++0x [class.dtor]p2: 5375 // A destructor shall not be declared with a ref-qualifier. 5376 if (FTI.hasRefQualifier()) { 5377 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5378 << FTI.RefQualifierIsLValueRef 5379 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5380 D.setInvalidType(); 5381 } 5382 5383 // Make sure we don't have any parameters. 5384 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5385 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5386 5387 // Delete the parameters. 5388 FTI.freeArgs(); 5389 D.setInvalidType(); 5390 } 5391 5392 // Make sure the destructor isn't variadic. 5393 if (FTI.isVariadic) { 5394 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5395 D.setInvalidType(); 5396 } 5397 5398 // Rebuild the function type "R" without any type qualifiers or 5399 // parameters (in case any of the errors above fired) and with 5400 // "void" as the return type, since destructors don't have return 5401 // types. 5402 if (!D.isInvalidType()) 5403 return R; 5404 5405 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5406 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5407 EPI.Variadic = false; 5408 EPI.TypeQuals = 0; 5409 EPI.RefQualifier = RQ_None; 5410 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5411} 5412 5413/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5414/// well-formednes of the conversion function declarator @p D with 5415/// type @p R. If there are any errors in the declarator, this routine 5416/// will emit diagnostics and return true. Otherwise, it will return 5417/// false. Either way, the type @p R will be updated to reflect a 5418/// well-formed type for the conversion operator. 5419void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5420 StorageClass& SC) { 5421 // C++ [class.conv.fct]p1: 5422 // Neither parameter types nor return type can be specified. The 5423 // type of a conversion function (8.3.5) is "function taking no 5424 // parameter returning conversion-type-id." 5425 if (SC == SC_Static) { 5426 if (!D.isInvalidType()) 5427 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5428 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5429 << SourceRange(D.getIdentifierLoc()); 5430 D.setInvalidType(); 5431 SC = SC_None; 5432 } 5433 5434 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5435 5436 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5437 // Conversion functions don't have return types, but the parser will 5438 // happily parse something like: 5439 // 5440 // class X { 5441 // float operator bool(); 5442 // }; 5443 // 5444 // The return type will be changed later anyway. 5445 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5446 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5447 << SourceRange(D.getIdentifierLoc()); 5448 D.setInvalidType(); 5449 } 5450 5451 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5452 5453 // Make sure we don't have any parameters. 5454 if (Proto->getNumArgs() > 0) { 5455 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5456 5457 // Delete the parameters. 5458 D.getFunctionTypeInfo().freeArgs(); 5459 D.setInvalidType(); 5460 } else if (Proto->isVariadic()) { 5461 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5462 D.setInvalidType(); 5463 } 5464 5465 // Diagnose "&operator bool()" and other such nonsense. This 5466 // is actually a gcc extension which we don't support. 5467 if (Proto->getResultType() != ConvType) { 5468 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5469 << Proto->getResultType(); 5470 D.setInvalidType(); 5471 ConvType = Proto->getResultType(); 5472 } 5473 5474 // C++ [class.conv.fct]p4: 5475 // The conversion-type-id shall not represent a function type nor 5476 // an array type. 5477 if (ConvType->isArrayType()) { 5478 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5479 ConvType = Context.getPointerType(ConvType); 5480 D.setInvalidType(); 5481 } else if (ConvType->isFunctionType()) { 5482 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5483 ConvType = Context.getPointerType(ConvType); 5484 D.setInvalidType(); 5485 } 5486 5487 // Rebuild the function type "R" without any parameters (in case any 5488 // of the errors above fired) and with the conversion type as the 5489 // return type. 5490 if (D.isInvalidType()) 5491 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5492 5493 // C++0x explicit conversion operators. 5494 if (D.getDeclSpec().isExplicitSpecified()) 5495 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5496 getLangOptions().CPlusPlus0x ? 5497 diag::warn_cxx98_compat_explicit_conversion_functions : 5498 diag::ext_explicit_conversion_functions) 5499 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5500} 5501 5502/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5503/// the declaration of the given C++ conversion function. This routine 5504/// is responsible for recording the conversion function in the C++ 5505/// class, if possible. 5506Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5507 assert(Conversion && "Expected to receive a conversion function declaration"); 5508 5509 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5510 5511 // Make sure we aren't redeclaring the conversion function. 5512 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5513 5514 // C++ [class.conv.fct]p1: 5515 // [...] A conversion function is never used to convert a 5516 // (possibly cv-qualified) object to the (possibly cv-qualified) 5517 // same object type (or a reference to it), to a (possibly 5518 // cv-qualified) base class of that type (or a reference to it), 5519 // or to (possibly cv-qualified) void. 5520 // FIXME: Suppress this warning if the conversion function ends up being a 5521 // virtual function that overrides a virtual function in a base class. 5522 QualType ClassType 5523 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5524 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5525 ConvType = ConvTypeRef->getPointeeType(); 5526 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5527 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5528 /* Suppress diagnostics for instantiations. */; 5529 else if (ConvType->isRecordType()) { 5530 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5531 if (ConvType == ClassType) 5532 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5533 << ClassType; 5534 else if (IsDerivedFrom(ClassType, ConvType)) 5535 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5536 << ClassType << ConvType; 5537 } else if (ConvType->isVoidType()) { 5538 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5539 << ClassType << ConvType; 5540 } 5541 5542 if (FunctionTemplateDecl *ConversionTemplate 5543 = Conversion->getDescribedFunctionTemplate()) 5544 return ConversionTemplate; 5545 5546 return Conversion; 5547} 5548 5549//===----------------------------------------------------------------------===// 5550// Namespace Handling 5551//===----------------------------------------------------------------------===// 5552 5553 5554 5555/// ActOnStartNamespaceDef - This is called at the start of a namespace 5556/// definition. 5557Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5558 SourceLocation InlineLoc, 5559 SourceLocation NamespaceLoc, 5560 SourceLocation IdentLoc, 5561 IdentifierInfo *II, 5562 SourceLocation LBrace, 5563 AttributeList *AttrList) { 5564 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5565 // For anonymous namespace, take the location of the left brace. 5566 SourceLocation Loc = II ? IdentLoc : LBrace; 5567 bool IsInline = InlineLoc.isValid(); 5568 bool IsInvalid = false; 5569 bool IsStd = false; 5570 bool AddToKnown = false; 5571 Scope *DeclRegionScope = NamespcScope->getParent(); 5572 5573 NamespaceDecl *PrevNS = 0; 5574 if (II) { 5575 // C++ [namespace.def]p2: 5576 // The identifier in an original-namespace-definition shall not 5577 // have been previously defined in the declarative region in 5578 // which the original-namespace-definition appears. The 5579 // identifier in an original-namespace-definition is the name of 5580 // the namespace. Subsequently in that declarative region, it is 5581 // treated as an original-namespace-name. 5582 // 5583 // Since namespace names are unique in their scope, and we don't 5584 // look through using directives, just look for any ordinary names. 5585 5586 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5587 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5588 Decl::IDNS_Namespace; 5589 NamedDecl *PrevDecl = 0; 5590 for (DeclContext::lookup_result R 5591 = CurContext->getRedeclContext()->lookup(II); 5592 R.first != R.second; ++R.first) { 5593 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5594 PrevDecl = *R.first; 5595 break; 5596 } 5597 } 5598 5599 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5600 5601 if (PrevNS) { 5602 // This is an extended namespace definition. 5603 if (IsInline != PrevNS->isInline()) { 5604 // inline-ness must match 5605 if (PrevNS->isInline()) { 5606 // The user probably just forgot the 'inline', so suggest that it 5607 // be added back. 5608 Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5609 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5610 } else { 5611 Diag(Loc, diag::err_inline_namespace_mismatch) 5612 << IsInline; 5613 } 5614 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5615 5616 IsInline = PrevNS->isInline(); 5617 } 5618 } else if (PrevDecl) { 5619 // This is an invalid name redefinition. 5620 Diag(Loc, diag::err_redefinition_different_kind) 5621 << II; 5622 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5623 IsInvalid = true; 5624 // Continue on to push Namespc as current DeclContext and return it. 5625 } else if (II->isStr("std") && 5626 CurContext->getRedeclContext()->isTranslationUnit()) { 5627 // This is the first "real" definition of the namespace "std", so update 5628 // our cache of the "std" namespace to point at this definition. 5629 PrevNS = getStdNamespace(); 5630 IsStd = true; 5631 AddToKnown = !IsInline; 5632 } else { 5633 // We've seen this namespace for the first time. 5634 AddToKnown = !IsInline; 5635 } 5636 } else { 5637 // Anonymous namespaces. 5638 5639 // Determine whether the parent already has an anonymous namespace. 5640 DeclContext *Parent = CurContext->getRedeclContext(); 5641 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5642 PrevNS = TU->getAnonymousNamespace(); 5643 } else { 5644 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5645 PrevNS = ND->getAnonymousNamespace(); 5646 } 5647 5648 if (PrevNS && IsInline != PrevNS->isInline()) { 5649 // inline-ness must match 5650 Diag(Loc, diag::err_inline_namespace_mismatch) 5651 << IsInline; 5652 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5653 5654 // Recover by ignoring the new namespace's inline status. 5655 IsInline = PrevNS->isInline(); 5656 } 5657 } 5658 5659 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5660 StartLoc, Loc, II, PrevNS); 5661 if (IsInvalid) 5662 Namespc->setInvalidDecl(); 5663 5664 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5665 5666 // FIXME: Should we be merging attributes? 5667 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5668 PushNamespaceVisibilityAttr(Attr); 5669 5670 if (IsStd) 5671 StdNamespace = Namespc; 5672 if (AddToKnown) 5673 KnownNamespaces[Namespc] = false; 5674 5675 if (II) { 5676 PushOnScopeChains(Namespc, DeclRegionScope); 5677 } else { 5678 // Link the anonymous namespace into its parent. 5679 DeclContext *Parent = CurContext->getRedeclContext(); 5680 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5681 TU->setAnonymousNamespace(Namespc); 5682 } else { 5683 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5684 } 5685 5686 CurContext->addDecl(Namespc); 5687 5688 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5689 // behaves as if it were replaced by 5690 // namespace unique { /* empty body */ } 5691 // using namespace unique; 5692 // namespace unique { namespace-body } 5693 // where all occurrences of 'unique' in a translation unit are 5694 // replaced by the same identifier and this identifier differs 5695 // from all other identifiers in the entire program. 5696 5697 // We just create the namespace with an empty name and then add an 5698 // implicit using declaration, just like the standard suggests. 5699 // 5700 // CodeGen enforces the "universally unique" aspect by giving all 5701 // declarations semantically contained within an anonymous 5702 // namespace internal linkage. 5703 5704 if (!PrevNS) { 5705 UsingDirectiveDecl* UD 5706 = UsingDirectiveDecl::Create(Context, CurContext, 5707 /* 'using' */ LBrace, 5708 /* 'namespace' */ SourceLocation(), 5709 /* qualifier */ NestedNameSpecifierLoc(), 5710 /* identifier */ SourceLocation(), 5711 Namespc, 5712 /* Ancestor */ CurContext); 5713 UD->setImplicit(); 5714 CurContext->addDecl(UD); 5715 } 5716 } 5717 5718 // Although we could have an invalid decl (i.e. the namespace name is a 5719 // redefinition), push it as current DeclContext and try to continue parsing. 5720 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5721 // for the namespace has the declarations that showed up in that particular 5722 // namespace definition. 5723 PushDeclContext(NamespcScope, Namespc); 5724 return Namespc; 5725} 5726 5727/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5728/// is a namespace alias, returns the namespace it points to. 5729static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5730 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5731 return AD->getNamespace(); 5732 return dyn_cast_or_null<NamespaceDecl>(D); 5733} 5734 5735/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5736/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5737void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5738 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5739 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5740 Namespc->setRBraceLoc(RBrace); 5741 PopDeclContext(); 5742 if (Namespc->hasAttr<VisibilityAttr>()) 5743 PopPragmaVisibility(); 5744} 5745 5746CXXRecordDecl *Sema::getStdBadAlloc() const { 5747 return cast_or_null<CXXRecordDecl>( 5748 StdBadAlloc.get(Context.getExternalSource())); 5749} 5750 5751NamespaceDecl *Sema::getStdNamespace() const { 5752 return cast_or_null<NamespaceDecl>( 5753 StdNamespace.get(Context.getExternalSource())); 5754} 5755 5756/// \brief Retrieve the special "std" namespace, which may require us to 5757/// implicitly define the namespace. 5758NamespaceDecl *Sema::getOrCreateStdNamespace() { 5759 if (!StdNamespace) { 5760 // The "std" namespace has not yet been defined, so build one implicitly. 5761 StdNamespace = NamespaceDecl::Create(Context, 5762 Context.getTranslationUnitDecl(), 5763 /*Inline=*/false, 5764 SourceLocation(), SourceLocation(), 5765 &PP.getIdentifierTable().get("std"), 5766 /*PrevDecl=*/0); 5767 getStdNamespace()->setImplicit(true); 5768 } 5769 5770 return getStdNamespace(); 5771} 5772 5773bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 5774 assert(getLangOptions().CPlusPlus && 5775 "Looking for std::initializer_list outside of C++."); 5776 5777 // We're looking for implicit instantiations of 5778 // template <typename E> class std::initializer_list. 5779 5780 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 5781 return false; 5782 5783 ClassTemplateDecl *Template = 0; 5784 const TemplateArgument *Arguments = 0; 5785 5786 if (const RecordType *RT = Ty->getAs<RecordType>()) { 5787 5788 ClassTemplateSpecializationDecl *Specialization = 5789 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 5790 if (!Specialization) 5791 return false; 5792 5793 if (Specialization->getSpecializationKind() != TSK_ImplicitInstantiation) 5794 return false; 5795 5796 Template = Specialization->getSpecializedTemplate(); 5797 Arguments = Specialization->getTemplateArgs().data(); 5798 } else if (const TemplateSpecializationType *TST = 5799 Ty->getAs<TemplateSpecializationType>()) { 5800 Template = dyn_cast_or_null<ClassTemplateDecl>( 5801 TST->getTemplateName().getAsTemplateDecl()); 5802 Arguments = TST->getArgs(); 5803 } 5804 if (!Template) 5805 return false; 5806 5807 if (!StdInitializerList) { 5808 // Haven't recognized std::initializer_list yet, maybe this is it. 5809 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 5810 if (TemplateClass->getIdentifier() != 5811 &PP.getIdentifierTable().get("initializer_list") || 5812 !TemplateClass->getDeclContext()->Equals(getStdNamespace())) 5813 return false; 5814 // This is a template called std::initializer_list, but is it the right 5815 // template? 5816 TemplateParameterList *Params = Template->getTemplateParameters(); 5817 if (Params->size() != 1) 5818 return false; 5819 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 5820 return false; 5821 5822 // It's the right template. 5823 StdInitializerList = Template; 5824 } 5825 5826 if (Template != StdInitializerList) 5827 return false; 5828 5829 // This is an instance of std::initializer_list. Find the argument type. 5830 if (Element) 5831 *Element = Arguments[0].getAsType(); 5832 return true; 5833} 5834 5835static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 5836 NamespaceDecl *Std = S.getStdNamespace(); 5837 if (!Std) { 5838 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5839 return 0; 5840 } 5841 5842 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 5843 Loc, Sema::LookupOrdinaryName); 5844 if (!S.LookupQualifiedName(Result, Std)) { 5845 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5846 return 0; 5847 } 5848 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 5849 if (!Template) { 5850 Result.suppressDiagnostics(); 5851 // We found something weird. Complain about the first thing we found. 5852 NamedDecl *Found = *Result.begin(); 5853 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 5854 return 0; 5855 } 5856 5857 // We found some template called std::initializer_list. Now verify that it's 5858 // correct. 5859 TemplateParameterList *Params = Template->getTemplateParameters(); 5860 if (Params->size() != 1 || !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 5861 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 5862 return 0; 5863 } 5864 5865 return Template; 5866} 5867 5868QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 5869 if (!StdInitializerList) { 5870 StdInitializerList = LookupStdInitializerList(*this, Loc); 5871 if (!StdInitializerList) 5872 return QualType(); 5873 } 5874 5875 TemplateArgumentListInfo Args(Loc, Loc); 5876 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 5877 Context.getTrivialTypeSourceInfo(Element, 5878 Loc))); 5879 return Context.getCanonicalType( 5880 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 5881} 5882 5883bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 5884 // C++ [dcl.init.list]p2: 5885 // A constructor is an initializer-list constructor if its first parameter 5886 // is of type std::initializer_list<E> or reference to possibly cv-qualified 5887 // std::initializer_list<E> for some type E, and either there are no other 5888 // parameters or else all other parameters have default arguments. 5889 if (Ctor->getNumParams() < 1 || 5890 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 5891 return false; 5892 5893 QualType ArgType = Ctor->getParamDecl(0)->getType(); 5894 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 5895 ArgType = RT->getPointeeType().getUnqualifiedType(); 5896 5897 return isStdInitializerList(ArgType, 0); 5898} 5899 5900/// \brief Determine whether a using statement is in a context where it will be 5901/// apply in all contexts. 5902static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5903 switch (CurContext->getDeclKind()) { 5904 case Decl::TranslationUnit: 5905 return true; 5906 case Decl::LinkageSpec: 5907 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5908 default: 5909 return false; 5910 } 5911} 5912 5913namespace { 5914 5915// Callback to only accept typo corrections that are namespaces. 5916class NamespaceValidatorCCC : public CorrectionCandidateCallback { 5917 public: 5918 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5919 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 5920 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 5921 } 5922 return false; 5923 } 5924}; 5925 5926} 5927 5928static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5929 CXXScopeSpec &SS, 5930 SourceLocation IdentLoc, 5931 IdentifierInfo *Ident) { 5932 NamespaceValidatorCCC Validator; 5933 R.clear(); 5934 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5935 R.getLookupKind(), Sc, &SS, 5936 &Validator)) { 5937 std::string CorrectedStr(Corrected.getAsString(S.getLangOptions())); 5938 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOptions())); 5939 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5940 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5941 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5942 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5943 else 5944 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5945 << Ident << CorrectedQuotedStr 5946 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5947 5948 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5949 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5950 5951 Ident = Corrected.getCorrectionAsIdentifierInfo(); 5952 R.addDecl(Corrected.getCorrectionDecl()); 5953 return true; 5954 } 5955 return false; 5956} 5957 5958Decl *Sema::ActOnUsingDirective(Scope *S, 5959 SourceLocation UsingLoc, 5960 SourceLocation NamespcLoc, 5961 CXXScopeSpec &SS, 5962 SourceLocation IdentLoc, 5963 IdentifierInfo *NamespcName, 5964 AttributeList *AttrList) { 5965 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5966 assert(NamespcName && "Invalid NamespcName."); 5967 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5968 5969 // This can only happen along a recovery path. 5970 while (S->getFlags() & Scope::TemplateParamScope) 5971 S = S->getParent(); 5972 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5973 5974 UsingDirectiveDecl *UDir = 0; 5975 NestedNameSpecifier *Qualifier = 0; 5976 if (SS.isSet()) 5977 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5978 5979 // Lookup namespace name. 5980 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5981 LookupParsedName(R, S, &SS); 5982 if (R.isAmbiguous()) 5983 return 0; 5984 5985 if (R.empty()) { 5986 R.clear(); 5987 // Allow "using namespace std;" or "using namespace ::std;" even if 5988 // "std" hasn't been defined yet, for GCC compatibility. 5989 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5990 NamespcName->isStr("std")) { 5991 Diag(IdentLoc, diag::ext_using_undefined_std); 5992 R.addDecl(getOrCreateStdNamespace()); 5993 R.resolveKind(); 5994 } 5995 // Otherwise, attempt typo correction. 5996 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5997 } 5998 5999 if (!R.empty()) { 6000 NamedDecl *Named = R.getFoundDecl(); 6001 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 6002 && "expected namespace decl"); 6003 // C++ [namespace.udir]p1: 6004 // A using-directive specifies that the names in the nominated 6005 // namespace can be used in the scope in which the 6006 // using-directive appears after the using-directive. During 6007 // unqualified name lookup (3.4.1), the names appear as if they 6008 // were declared in the nearest enclosing namespace which 6009 // contains both the using-directive and the nominated 6010 // namespace. [Note: in this context, "contains" means "contains 6011 // directly or indirectly". ] 6012 6013 // Find enclosing context containing both using-directive and 6014 // nominated namespace. 6015 NamespaceDecl *NS = getNamespaceDecl(Named); 6016 DeclContext *CommonAncestor = cast<DeclContext>(NS); 6017 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 6018 CommonAncestor = CommonAncestor->getParent(); 6019 6020 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 6021 SS.getWithLocInContext(Context), 6022 IdentLoc, Named, CommonAncestor); 6023 6024 if (IsUsingDirectiveInToplevelContext(CurContext) && 6025 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 6026 Diag(IdentLoc, diag::warn_using_directive_in_header); 6027 } 6028 6029 PushUsingDirective(S, UDir); 6030 } else { 6031 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6032 } 6033 6034 // FIXME: We ignore attributes for now. 6035 return UDir; 6036} 6037 6038void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 6039 // If scope has associated entity, then using directive is at namespace 6040 // or translation unit scope. We add UsingDirectiveDecls, into 6041 // it's lookup structure. 6042 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 6043 Ctx->addDecl(UDir); 6044 else 6045 // Otherwise it is block-sope. using-directives will affect lookup 6046 // only to the end of scope. 6047 S->PushUsingDirective(UDir); 6048} 6049 6050 6051Decl *Sema::ActOnUsingDeclaration(Scope *S, 6052 AccessSpecifier AS, 6053 bool HasUsingKeyword, 6054 SourceLocation UsingLoc, 6055 CXXScopeSpec &SS, 6056 UnqualifiedId &Name, 6057 AttributeList *AttrList, 6058 bool IsTypeName, 6059 SourceLocation TypenameLoc) { 6060 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6061 6062 switch (Name.getKind()) { 6063 case UnqualifiedId::IK_ImplicitSelfParam: 6064 case UnqualifiedId::IK_Identifier: 6065 case UnqualifiedId::IK_OperatorFunctionId: 6066 case UnqualifiedId::IK_LiteralOperatorId: 6067 case UnqualifiedId::IK_ConversionFunctionId: 6068 break; 6069 6070 case UnqualifiedId::IK_ConstructorName: 6071 case UnqualifiedId::IK_ConstructorTemplateId: 6072 // C++0x inherited constructors. 6073 Diag(Name.getSourceRange().getBegin(), 6074 getLangOptions().CPlusPlus0x ? 6075 diag::warn_cxx98_compat_using_decl_constructor : 6076 diag::err_using_decl_constructor) 6077 << SS.getRange(); 6078 6079 if (getLangOptions().CPlusPlus0x) break; 6080 6081 return 0; 6082 6083 case UnqualifiedId::IK_DestructorName: 6084 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 6085 << SS.getRange(); 6086 return 0; 6087 6088 case UnqualifiedId::IK_TemplateId: 6089 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 6090 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 6091 return 0; 6092 } 6093 6094 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 6095 DeclarationName TargetName = TargetNameInfo.getName(); 6096 if (!TargetName) 6097 return 0; 6098 6099 // Warn about using declarations. 6100 // TODO: store that the declaration was written without 'using' and 6101 // talk about access decls instead of using decls in the 6102 // diagnostics. 6103 if (!HasUsingKeyword) { 6104 UsingLoc = Name.getSourceRange().getBegin(); 6105 6106 Diag(UsingLoc, diag::warn_access_decl_deprecated) 6107 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 6108 } 6109 6110 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 6111 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 6112 return 0; 6113 6114 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 6115 TargetNameInfo, AttrList, 6116 /* IsInstantiation */ false, 6117 IsTypeName, TypenameLoc); 6118 if (UD) 6119 PushOnScopeChains(UD, S, /*AddToContext*/ false); 6120 6121 return UD; 6122} 6123 6124/// \brief Determine whether a using declaration considers the given 6125/// declarations as "equivalent", e.g., if they are redeclarations of 6126/// the same entity or are both typedefs of the same type. 6127static bool 6128IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 6129 bool &SuppressRedeclaration) { 6130 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 6131 SuppressRedeclaration = false; 6132 return true; 6133 } 6134 6135 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 6136 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 6137 SuppressRedeclaration = true; 6138 return Context.hasSameType(TD1->getUnderlyingType(), 6139 TD2->getUnderlyingType()); 6140 } 6141 6142 return false; 6143} 6144 6145 6146/// Determines whether to create a using shadow decl for a particular 6147/// decl, given the set of decls existing prior to this using lookup. 6148bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 6149 const LookupResult &Previous) { 6150 // Diagnose finding a decl which is not from a base class of the 6151 // current class. We do this now because there are cases where this 6152 // function will silently decide not to build a shadow decl, which 6153 // will pre-empt further diagnostics. 6154 // 6155 // We don't need to do this in C++0x because we do the check once on 6156 // the qualifier. 6157 // 6158 // FIXME: diagnose the following if we care enough: 6159 // struct A { int foo; }; 6160 // struct B : A { using A::foo; }; 6161 // template <class T> struct C : A {}; 6162 // template <class T> struct D : C<T> { using B::foo; } // <--- 6163 // This is invalid (during instantiation) in C++03 because B::foo 6164 // resolves to the using decl in B, which is not a base class of D<T>. 6165 // We can't diagnose it immediately because C<T> is an unknown 6166 // specialization. The UsingShadowDecl in D<T> then points directly 6167 // to A::foo, which will look well-formed when we instantiate. 6168 // The right solution is to not collapse the shadow-decl chain. 6169 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 6170 DeclContext *OrigDC = Orig->getDeclContext(); 6171 6172 // Handle enums and anonymous structs. 6173 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 6174 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 6175 while (OrigRec->isAnonymousStructOrUnion()) 6176 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 6177 6178 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 6179 if (OrigDC == CurContext) { 6180 Diag(Using->getLocation(), 6181 diag::err_using_decl_nested_name_specifier_is_current_class) 6182 << Using->getQualifierLoc().getSourceRange(); 6183 Diag(Orig->getLocation(), diag::note_using_decl_target); 6184 return true; 6185 } 6186 6187 Diag(Using->getQualifierLoc().getBeginLoc(), 6188 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6189 << Using->getQualifier() 6190 << cast<CXXRecordDecl>(CurContext) 6191 << Using->getQualifierLoc().getSourceRange(); 6192 Diag(Orig->getLocation(), diag::note_using_decl_target); 6193 return true; 6194 } 6195 } 6196 6197 if (Previous.empty()) return false; 6198 6199 NamedDecl *Target = Orig; 6200 if (isa<UsingShadowDecl>(Target)) 6201 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6202 6203 // If the target happens to be one of the previous declarations, we 6204 // don't have a conflict. 6205 // 6206 // FIXME: but we might be increasing its access, in which case we 6207 // should redeclare it. 6208 NamedDecl *NonTag = 0, *Tag = 0; 6209 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 6210 I != E; ++I) { 6211 NamedDecl *D = (*I)->getUnderlyingDecl(); 6212 bool Result; 6213 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 6214 return Result; 6215 6216 (isa<TagDecl>(D) ? Tag : NonTag) = D; 6217 } 6218 6219 if (Target->isFunctionOrFunctionTemplate()) { 6220 FunctionDecl *FD; 6221 if (isa<FunctionTemplateDecl>(Target)) 6222 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6223 else 6224 FD = cast<FunctionDecl>(Target); 6225 6226 NamedDecl *OldDecl = 0; 6227 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6228 case Ovl_Overload: 6229 return false; 6230 6231 case Ovl_NonFunction: 6232 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6233 break; 6234 6235 // We found a decl with the exact signature. 6236 case Ovl_Match: 6237 // If we're in a record, we want to hide the target, so we 6238 // return true (without a diagnostic) to tell the caller not to 6239 // build a shadow decl. 6240 if (CurContext->isRecord()) 6241 return true; 6242 6243 // If we're not in a record, this is an error. 6244 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6245 break; 6246 } 6247 6248 Diag(Target->getLocation(), diag::note_using_decl_target); 6249 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6250 return true; 6251 } 6252 6253 // Target is not a function. 6254 6255 if (isa<TagDecl>(Target)) { 6256 // No conflict between a tag and a non-tag. 6257 if (!Tag) return false; 6258 6259 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6260 Diag(Target->getLocation(), diag::note_using_decl_target); 6261 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6262 return true; 6263 } 6264 6265 // No conflict between a tag and a non-tag. 6266 if (!NonTag) return false; 6267 6268 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6269 Diag(Target->getLocation(), diag::note_using_decl_target); 6270 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6271 return true; 6272} 6273 6274/// Builds a shadow declaration corresponding to a 'using' declaration. 6275UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6276 UsingDecl *UD, 6277 NamedDecl *Orig) { 6278 6279 // If we resolved to another shadow declaration, just coalesce them. 6280 NamedDecl *Target = Orig; 6281 if (isa<UsingShadowDecl>(Target)) { 6282 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6283 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6284 } 6285 6286 UsingShadowDecl *Shadow 6287 = UsingShadowDecl::Create(Context, CurContext, 6288 UD->getLocation(), UD, Target); 6289 UD->addShadowDecl(Shadow); 6290 6291 Shadow->setAccess(UD->getAccess()); 6292 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6293 Shadow->setInvalidDecl(); 6294 6295 if (S) 6296 PushOnScopeChains(Shadow, S); 6297 else 6298 CurContext->addDecl(Shadow); 6299 6300 6301 return Shadow; 6302} 6303 6304/// Hides a using shadow declaration. This is required by the current 6305/// using-decl implementation when a resolvable using declaration in a 6306/// class is followed by a declaration which would hide or override 6307/// one or more of the using decl's targets; for example: 6308/// 6309/// struct Base { void foo(int); }; 6310/// struct Derived : Base { 6311/// using Base::foo; 6312/// void foo(int); 6313/// }; 6314/// 6315/// The governing language is C++03 [namespace.udecl]p12: 6316/// 6317/// When a using-declaration brings names from a base class into a 6318/// derived class scope, member functions in the derived class 6319/// override and/or hide member functions with the same name and 6320/// parameter types in a base class (rather than conflicting). 6321/// 6322/// There are two ways to implement this: 6323/// (1) optimistically create shadow decls when they're not hidden 6324/// by existing declarations, or 6325/// (2) don't create any shadow decls (or at least don't make them 6326/// visible) until we've fully parsed/instantiated the class. 6327/// The problem with (1) is that we might have to retroactively remove 6328/// a shadow decl, which requires several O(n) operations because the 6329/// decl structures are (very reasonably) not designed for removal. 6330/// (2) avoids this but is very fiddly and phase-dependent. 6331void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6332 if (Shadow->getDeclName().getNameKind() == 6333 DeclarationName::CXXConversionFunctionName) 6334 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6335 6336 // Remove it from the DeclContext... 6337 Shadow->getDeclContext()->removeDecl(Shadow); 6338 6339 // ...and the scope, if applicable... 6340 if (S) { 6341 S->RemoveDecl(Shadow); 6342 IdResolver.RemoveDecl(Shadow); 6343 } 6344 6345 // ...and the using decl. 6346 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6347 6348 // TODO: complain somehow if Shadow was used. It shouldn't 6349 // be possible for this to happen, because...? 6350} 6351 6352/// Builds a using declaration. 6353/// 6354/// \param IsInstantiation - Whether this call arises from an 6355/// instantiation of an unresolved using declaration. We treat 6356/// the lookup differently for these declarations. 6357NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6358 SourceLocation UsingLoc, 6359 CXXScopeSpec &SS, 6360 const DeclarationNameInfo &NameInfo, 6361 AttributeList *AttrList, 6362 bool IsInstantiation, 6363 bool IsTypeName, 6364 SourceLocation TypenameLoc) { 6365 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6366 SourceLocation IdentLoc = NameInfo.getLoc(); 6367 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6368 6369 // FIXME: We ignore attributes for now. 6370 6371 if (SS.isEmpty()) { 6372 Diag(IdentLoc, diag::err_using_requires_qualname); 6373 return 0; 6374 } 6375 6376 // Do the redeclaration lookup in the current scope. 6377 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6378 ForRedeclaration); 6379 Previous.setHideTags(false); 6380 if (S) { 6381 LookupName(Previous, S); 6382 6383 // It is really dumb that we have to do this. 6384 LookupResult::Filter F = Previous.makeFilter(); 6385 while (F.hasNext()) { 6386 NamedDecl *D = F.next(); 6387 if (!isDeclInScope(D, CurContext, S)) 6388 F.erase(); 6389 } 6390 F.done(); 6391 } else { 6392 assert(IsInstantiation && "no scope in non-instantiation"); 6393 assert(CurContext->isRecord() && "scope not record in instantiation"); 6394 LookupQualifiedName(Previous, CurContext); 6395 } 6396 6397 // Check for invalid redeclarations. 6398 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6399 return 0; 6400 6401 // Check for bad qualifiers. 6402 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6403 return 0; 6404 6405 DeclContext *LookupContext = computeDeclContext(SS); 6406 NamedDecl *D; 6407 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6408 if (!LookupContext) { 6409 if (IsTypeName) { 6410 // FIXME: not all declaration name kinds are legal here 6411 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6412 UsingLoc, TypenameLoc, 6413 QualifierLoc, 6414 IdentLoc, NameInfo.getName()); 6415 } else { 6416 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6417 QualifierLoc, NameInfo); 6418 } 6419 } else { 6420 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6421 NameInfo, IsTypeName); 6422 } 6423 D->setAccess(AS); 6424 CurContext->addDecl(D); 6425 6426 if (!LookupContext) return D; 6427 UsingDecl *UD = cast<UsingDecl>(D); 6428 6429 if (RequireCompleteDeclContext(SS, LookupContext)) { 6430 UD->setInvalidDecl(); 6431 return UD; 6432 } 6433 6434 // Constructor inheriting using decls get special treatment. 6435 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6436 if (CheckInheritedConstructorUsingDecl(UD)) 6437 UD->setInvalidDecl(); 6438 return UD; 6439 } 6440 6441 // Otherwise, look up the target name. 6442 6443 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6444 6445 // Unlike most lookups, we don't always want to hide tag 6446 // declarations: tag names are visible through the using declaration 6447 // even if hidden by ordinary names, *except* in a dependent context 6448 // where it's important for the sanity of two-phase lookup. 6449 if (!IsInstantiation) 6450 R.setHideTags(false); 6451 6452 LookupQualifiedName(R, LookupContext); 6453 6454 if (R.empty()) { 6455 Diag(IdentLoc, diag::err_no_member) 6456 << NameInfo.getName() << LookupContext << SS.getRange(); 6457 UD->setInvalidDecl(); 6458 return UD; 6459 } 6460 6461 if (R.isAmbiguous()) { 6462 UD->setInvalidDecl(); 6463 return UD; 6464 } 6465 6466 if (IsTypeName) { 6467 // If we asked for a typename and got a non-type decl, error out. 6468 if (!R.getAsSingle<TypeDecl>()) { 6469 Diag(IdentLoc, diag::err_using_typename_non_type); 6470 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6471 Diag((*I)->getUnderlyingDecl()->getLocation(), 6472 diag::note_using_decl_target); 6473 UD->setInvalidDecl(); 6474 return UD; 6475 } 6476 } else { 6477 // If we asked for a non-typename and we got a type, error out, 6478 // but only if this is an instantiation of an unresolved using 6479 // decl. Otherwise just silently find the type name. 6480 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6481 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6482 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6483 UD->setInvalidDecl(); 6484 return UD; 6485 } 6486 } 6487 6488 // C++0x N2914 [namespace.udecl]p6: 6489 // A using-declaration shall not name a namespace. 6490 if (R.getAsSingle<NamespaceDecl>()) { 6491 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6492 << SS.getRange(); 6493 UD->setInvalidDecl(); 6494 return UD; 6495 } 6496 6497 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6498 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6499 BuildUsingShadowDecl(S, UD, *I); 6500 } 6501 6502 return UD; 6503} 6504 6505/// Additional checks for a using declaration referring to a constructor name. 6506bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 6507 if (UD->isTypeName()) { 6508 // FIXME: Cannot specify typename when specifying constructor 6509 return true; 6510 } 6511 6512 const Type *SourceType = UD->getQualifier()->getAsType(); 6513 assert(SourceType && 6514 "Using decl naming constructor doesn't have type in scope spec."); 6515 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6516 6517 // Check whether the named type is a direct base class. 6518 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6519 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6520 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6521 BaseIt != BaseE; ++BaseIt) { 6522 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6523 if (CanonicalSourceType == BaseType) 6524 break; 6525 } 6526 6527 if (BaseIt == BaseE) { 6528 // Did not find SourceType in the bases. 6529 Diag(UD->getUsingLocation(), 6530 diag::err_using_decl_constructor_not_in_direct_base) 6531 << UD->getNameInfo().getSourceRange() 6532 << QualType(SourceType, 0) << TargetClass; 6533 return true; 6534 } 6535 6536 BaseIt->setInheritConstructors(); 6537 6538 return false; 6539} 6540 6541/// Checks that the given using declaration is not an invalid 6542/// redeclaration. Note that this is checking only for the using decl 6543/// itself, not for any ill-formedness among the UsingShadowDecls. 6544bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6545 bool isTypeName, 6546 const CXXScopeSpec &SS, 6547 SourceLocation NameLoc, 6548 const LookupResult &Prev) { 6549 // C++03 [namespace.udecl]p8: 6550 // C++0x [namespace.udecl]p10: 6551 // A using-declaration is a declaration and can therefore be used 6552 // repeatedly where (and only where) multiple declarations are 6553 // allowed. 6554 // 6555 // That's in non-member contexts. 6556 if (!CurContext->getRedeclContext()->isRecord()) 6557 return false; 6558 6559 NestedNameSpecifier *Qual 6560 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6561 6562 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6563 NamedDecl *D = *I; 6564 6565 bool DTypename; 6566 NestedNameSpecifier *DQual; 6567 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6568 DTypename = UD->isTypeName(); 6569 DQual = UD->getQualifier(); 6570 } else if (UnresolvedUsingValueDecl *UD 6571 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6572 DTypename = false; 6573 DQual = UD->getQualifier(); 6574 } else if (UnresolvedUsingTypenameDecl *UD 6575 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6576 DTypename = true; 6577 DQual = UD->getQualifier(); 6578 } else continue; 6579 6580 // using decls differ if one says 'typename' and the other doesn't. 6581 // FIXME: non-dependent using decls? 6582 if (isTypeName != DTypename) continue; 6583 6584 // using decls differ if they name different scopes (but note that 6585 // template instantiation can cause this check to trigger when it 6586 // didn't before instantiation). 6587 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6588 Context.getCanonicalNestedNameSpecifier(DQual)) 6589 continue; 6590 6591 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6592 Diag(D->getLocation(), diag::note_using_decl) << 1; 6593 return true; 6594 } 6595 6596 return false; 6597} 6598 6599 6600/// Checks that the given nested-name qualifier used in a using decl 6601/// in the current context is appropriately related to the current 6602/// scope. If an error is found, diagnoses it and returns true. 6603bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6604 const CXXScopeSpec &SS, 6605 SourceLocation NameLoc) { 6606 DeclContext *NamedContext = computeDeclContext(SS); 6607 6608 if (!CurContext->isRecord()) { 6609 // C++03 [namespace.udecl]p3: 6610 // C++0x [namespace.udecl]p8: 6611 // A using-declaration for a class member shall be a member-declaration. 6612 6613 // If we weren't able to compute a valid scope, it must be a 6614 // dependent class scope. 6615 if (!NamedContext || NamedContext->isRecord()) { 6616 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6617 << SS.getRange(); 6618 return true; 6619 } 6620 6621 // Otherwise, everything is known to be fine. 6622 return false; 6623 } 6624 6625 // The current scope is a record. 6626 6627 // If the named context is dependent, we can't decide much. 6628 if (!NamedContext) { 6629 // FIXME: in C++0x, we can diagnose if we can prove that the 6630 // nested-name-specifier does not refer to a base class, which is 6631 // still possible in some cases. 6632 6633 // Otherwise we have to conservatively report that things might be 6634 // okay. 6635 return false; 6636 } 6637 6638 if (!NamedContext->isRecord()) { 6639 // Ideally this would point at the last name in the specifier, 6640 // but we don't have that level of source info. 6641 Diag(SS.getRange().getBegin(), 6642 diag::err_using_decl_nested_name_specifier_is_not_class) 6643 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6644 return true; 6645 } 6646 6647 if (!NamedContext->isDependentContext() && 6648 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6649 return true; 6650 6651 if (getLangOptions().CPlusPlus0x) { 6652 // C++0x [namespace.udecl]p3: 6653 // In a using-declaration used as a member-declaration, the 6654 // nested-name-specifier shall name a base class of the class 6655 // being defined. 6656 6657 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6658 cast<CXXRecordDecl>(NamedContext))) { 6659 if (CurContext == NamedContext) { 6660 Diag(NameLoc, 6661 diag::err_using_decl_nested_name_specifier_is_current_class) 6662 << SS.getRange(); 6663 return true; 6664 } 6665 6666 Diag(SS.getRange().getBegin(), 6667 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6668 << (NestedNameSpecifier*) SS.getScopeRep() 6669 << cast<CXXRecordDecl>(CurContext) 6670 << SS.getRange(); 6671 return true; 6672 } 6673 6674 return false; 6675 } 6676 6677 // C++03 [namespace.udecl]p4: 6678 // A using-declaration used as a member-declaration shall refer 6679 // to a member of a base class of the class being defined [etc.]. 6680 6681 // Salient point: SS doesn't have to name a base class as long as 6682 // lookup only finds members from base classes. Therefore we can 6683 // diagnose here only if we can prove that that can't happen, 6684 // i.e. if the class hierarchies provably don't intersect. 6685 6686 // TODO: it would be nice if "definitely valid" results were cached 6687 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6688 // need to be repeated. 6689 6690 struct UserData { 6691 llvm::DenseSet<const CXXRecordDecl*> Bases; 6692 6693 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6694 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6695 Data->Bases.insert(Base); 6696 return true; 6697 } 6698 6699 bool hasDependentBases(const CXXRecordDecl *Class) { 6700 return !Class->forallBases(collect, this); 6701 } 6702 6703 /// Returns true if the base is dependent or is one of the 6704 /// accumulated base classes. 6705 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6706 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6707 return !Data->Bases.count(Base); 6708 } 6709 6710 bool mightShareBases(const CXXRecordDecl *Class) { 6711 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6712 } 6713 }; 6714 6715 UserData Data; 6716 6717 // Returns false if we find a dependent base. 6718 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6719 return false; 6720 6721 // Returns false if the class has a dependent base or if it or one 6722 // of its bases is present in the base set of the current context. 6723 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6724 return false; 6725 6726 Diag(SS.getRange().getBegin(), 6727 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6728 << (NestedNameSpecifier*) SS.getScopeRep() 6729 << cast<CXXRecordDecl>(CurContext) 6730 << SS.getRange(); 6731 6732 return true; 6733} 6734 6735Decl *Sema::ActOnAliasDeclaration(Scope *S, 6736 AccessSpecifier AS, 6737 MultiTemplateParamsArg TemplateParamLists, 6738 SourceLocation UsingLoc, 6739 UnqualifiedId &Name, 6740 TypeResult Type) { 6741 // Skip up to the relevant declaration scope. 6742 while (S->getFlags() & Scope::TemplateParamScope) 6743 S = S->getParent(); 6744 assert((S->getFlags() & Scope::DeclScope) && 6745 "got alias-declaration outside of declaration scope"); 6746 6747 if (Type.isInvalid()) 6748 return 0; 6749 6750 bool Invalid = false; 6751 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6752 TypeSourceInfo *TInfo = 0; 6753 GetTypeFromParser(Type.get(), &TInfo); 6754 6755 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6756 return 0; 6757 6758 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6759 UPPC_DeclarationType)) { 6760 Invalid = true; 6761 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6762 TInfo->getTypeLoc().getBeginLoc()); 6763 } 6764 6765 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6766 LookupName(Previous, S); 6767 6768 // Warn about shadowing the name of a template parameter. 6769 if (Previous.isSingleResult() && 6770 Previous.getFoundDecl()->isTemplateParameter()) { 6771 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6772 Previous.clear(); 6773 } 6774 6775 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6776 "name in alias declaration must be an identifier"); 6777 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6778 Name.StartLocation, 6779 Name.Identifier, TInfo); 6780 6781 NewTD->setAccess(AS); 6782 6783 if (Invalid) 6784 NewTD->setInvalidDecl(); 6785 6786 CheckTypedefForVariablyModifiedType(S, NewTD); 6787 Invalid |= NewTD->isInvalidDecl(); 6788 6789 bool Redeclaration = false; 6790 6791 NamedDecl *NewND; 6792 if (TemplateParamLists.size()) { 6793 TypeAliasTemplateDecl *OldDecl = 0; 6794 TemplateParameterList *OldTemplateParams = 0; 6795 6796 if (TemplateParamLists.size() != 1) { 6797 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6798 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6799 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6800 } 6801 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6802 6803 // Only consider previous declarations in the same scope. 6804 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6805 /*ExplicitInstantiationOrSpecialization*/false); 6806 if (!Previous.empty()) { 6807 Redeclaration = true; 6808 6809 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6810 if (!OldDecl && !Invalid) { 6811 Diag(UsingLoc, diag::err_redefinition_different_kind) 6812 << Name.Identifier; 6813 6814 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6815 if (OldD->getLocation().isValid()) 6816 Diag(OldD->getLocation(), diag::note_previous_definition); 6817 6818 Invalid = true; 6819 } 6820 6821 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6822 if (TemplateParameterListsAreEqual(TemplateParams, 6823 OldDecl->getTemplateParameters(), 6824 /*Complain=*/true, 6825 TPL_TemplateMatch)) 6826 OldTemplateParams = OldDecl->getTemplateParameters(); 6827 else 6828 Invalid = true; 6829 6830 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6831 if (!Invalid && 6832 !Context.hasSameType(OldTD->getUnderlyingType(), 6833 NewTD->getUnderlyingType())) { 6834 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6835 // but we can't reasonably accept it. 6836 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6837 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6838 if (OldTD->getLocation().isValid()) 6839 Diag(OldTD->getLocation(), diag::note_previous_definition); 6840 Invalid = true; 6841 } 6842 } 6843 } 6844 6845 // Merge any previous default template arguments into our parameters, 6846 // and check the parameter list. 6847 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6848 TPC_TypeAliasTemplate)) 6849 return 0; 6850 6851 TypeAliasTemplateDecl *NewDecl = 6852 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6853 Name.Identifier, TemplateParams, 6854 NewTD); 6855 6856 NewDecl->setAccess(AS); 6857 6858 if (Invalid) 6859 NewDecl->setInvalidDecl(); 6860 else if (OldDecl) 6861 NewDecl->setPreviousDeclaration(OldDecl); 6862 6863 NewND = NewDecl; 6864 } else { 6865 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6866 NewND = NewTD; 6867 } 6868 6869 if (!Redeclaration) 6870 PushOnScopeChains(NewND, S); 6871 6872 return NewND; 6873} 6874 6875Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6876 SourceLocation NamespaceLoc, 6877 SourceLocation AliasLoc, 6878 IdentifierInfo *Alias, 6879 CXXScopeSpec &SS, 6880 SourceLocation IdentLoc, 6881 IdentifierInfo *Ident) { 6882 6883 // Lookup the namespace name. 6884 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6885 LookupParsedName(R, S, &SS); 6886 6887 // Check if we have a previous declaration with the same name. 6888 NamedDecl *PrevDecl 6889 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6890 ForRedeclaration); 6891 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6892 PrevDecl = 0; 6893 6894 if (PrevDecl) { 6895 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6896 // We already have an alias with the same name that points to the same 6897 // namespace, so don't create a new one. 6898 // FIXME: At some point, we'll want to create the (redundant) 6899 // declaration to maintain better source information. 6900 if (!R.isAmbiguous() && !R.empty() && 6901 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6902 return 0; 6903 } 6904 6905 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6906 diag::err_redefinition_different_kind; 6907 Diag(AliasLoc, DiagID) << Alias; 6908 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6909 return 0; 6910 } 6911 6912 if (R.isAmbiguous()) 6913 return 0; 6914 6915 if (R.empty()) { 6916 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6917 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 6918 return 0; 6919 } 6920 } 6921 6922 NamespaceAliasDecl *AliasDecl = 6923 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6924 Alias, SS.getWithLocInContext(Context), 6925 IdentLoc, R.getFoundDecl()); 6926 6927 PushOnScopeChains(AliasDecl, S); 6928 return AliasDecl; 6929} 6930 6931namespace { 6932 /// \brief Scoped object used to handle the state changes required in Sema 6933 /// to implicitly define the body of a C++ member function; 6934 class ImplicitlyDefinedFunctionScope { 6935 Sema &S; 6936 Sema::ContextRAII SavedContext; 6937 6938 public: 6939 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6940 : S(S), SavedContext(S, Method) 6941 { 6942 S.PushFunctionScope(); 6943 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6944 } 6945 6946 ~ImplicitlyDefinedFunctionScope() { 6947 S.PopExpressionEvaluationContext(); 6948 S.PopFunctionScopeInfo(); 6949 } 6950 }; 6951} 6952 6953Sema::ImplicitExceptionSpecification 6954Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6955 // C++ [except.spec]p14: 6956 // An implicitly declared special member function (Clause 12) shall have an 6957 // exception-specification. [...] 6958 ImplicitExceptionSpecification ExceptSpec(Context); 6959 if (ClassDecl->isInvalidDecl()) 6960 return ExceptSpec; 6961 6962 // Direct base-class constructors. 6963 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6964 BEnd = ClassDecl->bases_end(); 6965 B != BEnd; ++B) { 6966 if (B->isVirtual()) // Handled below. 6967 continue; 6968 6969 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6970 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6971 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6972 // If this is a deleted function, add it anyway. This might be conformant 6973 // with the standard. This might not. I'm not sure. It might not matter. 6974 if (Constructor) 6975 ExceptSpec.CalledDecl(Constructor); 6976 } 6977 } 6978 6979 // Virtual base-class constructors. 6980 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6981 BEnd = ClassDecl->vbases_end(); 6982 B != BEnd; ++B) { 6983 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6984 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6985 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6986 // If this is a deleted function, add it anyway. This might be conformant 6987 // with the standard. This might not. I'm not sure. It might not matter. 6988 if (Constructor) 6989 ExceptSpec.CalledDecl(Constructor); 6990 } 6991 } 6992 6993 // Field constructors. 6994 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6995 FEnd = ClassDecl->field_end(); 6996 F != FEnd; ++F) { 6997 if (F->hasInClassInitializer()) { 6998 if (Expr *E = F->getInClassInitializer()) 6999 ExceptSpec.CalledExpr(E); 7000 else if (!F->isInvalidDecl()) 7001 ExceptSpec.SetDelayed(); 7002 } else if (const RecordType *RecordTy 7003 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 7004 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7005 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 7006 // If this is a deleted function, add it anyway. This might be conformant 7007 // with the standard. This might not. I'm not sure. It might not matter. 7008 // In particular, the problem is that this function never gets called. It 7009 // might just be ill-formed because this function attempts to refer to 7010 // a deleted function here. 7011 if (Constructor) 7012 ExceptSpec.CalledDecl(Constructor); 7013 } 7014 } 7015 7016 return ExceptSpec; 7017} 7018 7019CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 7020 CXXRecordDecl *ClassDecl) { 7021 // C++ [class.ctor]p5: 7022 // A default constructor for a class X is a constructor of class X 7023 // that can be called without an argument. If there is no 7024 // user-declared constructor for class X, a default constructor is 7025 // implicitly declared. An implicitly-declared default constructor 7026 // is an inline public member of its class. 7027 assert(!ClassDecl->hasUserDeclaredConstructor() && 7028 "Should not build implicit default constructor!"); 7029 7030 ImplicitExceptionSpecification Spec = 7031 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 7032 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7033 7034 // Create the actual constructor declaration. 7035 CanQualType ClassType 7036 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7037 SourceLocation ClassLoc = ClassDecl->getLocation(); 7038 DeclarationName Name 7039 = Context.DeclarationNames.getCXXConstructorName(ClassType); 7040 DeclarationNameInfo NameInfo(Name, ClassLoc); 7041 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 7042 Context, ClassDecl, ClassLoc, NameInfo, 7043 Context.getFunctionType(Context.VoidTy, 0, 0, EPI), /*TInfo=*/0, 7044 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 7045 /*isConstexpr=*/ClassDecl->defaultedDefaultConstructorIsConstexpr() && 7046 getLangOptions().CPlusPlus0x); 7047 DefaultCon->setAccess(AS_public); 7048 DefaultCon->setDefaulted(); 7049 DefaultCon->setImplicit(); 7050 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 7051 7052 // Note that we have declared this constructor. 7053 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 7054 7055 if (Scope *S = getScopeForContext(ClassDecl)) 7056 PushOnScopeChains(DefaultCon, S, false); 7057 ClassDecl->addDecl(DefaultCon); 7058 7059 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 7060 DefaultCon->setDeletedAsWritten(); 7061 7062 return DefaultCon; 7063} 7064 7065void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 7066 CXXConstructorDecl *Constructor) { 7067 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 7068 !Constructor->doesThisDeclarationHaveABody() && 7069 !Constructor->isDeleted()) && 7070 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 7071 7072 CXXRecordDecl *ClassDecl = Constructor->getParent(); 7073 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 7074 7075 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 7076 DiagnosticErrorTrap Trap(Diags); 7077 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 7078 Trap.hasErrorOccurred()) { 7079 Diag(CurrentLocation, diag::note_member_synthesized_at) 7080 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 7081 Constructor->setInvalidDecl(); 7082 return; 7083 } 7084 7085 SourceLocation Loc = Constructor->getLocation(); 7086 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7087 7088 Constructor->setUsed(); 7089 MarkVTableUsed(CurrentLocation, ClassDecl); 7090 7091 if (ASTMutationListener *L = getASTMutationListener()) { 7092 L->CompletedImplicitDefinition(Constructor); 7093 } 7094} 7095 7096/// Get any existing defaulted default constructor for the given class. Do not 7097/// implicitly define one if it does not exist. 7098static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 7099 CXXRecordDecl *D) { 7100 ASTContext &Context = Self.Context; 7101 QualType ClassType = Context.getTypeDeclType(D); 7102 DeclarationName ConstructorName 7103 = Context.DeclarationNames.getCXXConstructorName( 7104 Context.getCanonicalType(ClassType.getUnqualifiedType())); 7105 7106 DeclContext::lookup_const_iterator Con, ConEnd; 7107 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 7108 Con != ConEnd; ++Con) { 7109 // A function template cannot be defaulted. 7110 if (isa<FunctionTemplateDecl>(*Con)) 7111 continue; 7112 7113 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 7114 if (Constructor->isDefaultConstructor()) 7115 return Constructor->isDefaulted() ? Constructor : 0; 7116 } 7117 return 0; 7118} 7119 7120void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 7121 if (!D) return; 7122 AdjustDeclIfTemplate(D); 7123 7124 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 7125 CXXConstructorDecl *CtorDecl 7126 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 7127 7128 if (!CtorDecl) return; 7129 7130 // Compute the exception specification for the default constructor. 7131 const FunctionProtoType *CtorTy = 7132 CtorDecl->getType()->castAs<FunctionProtoType>(); 7133 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 7134 ImplicitExceptionSpecification Spec = 7135 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 7136 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7137 assert(EPI.ExceptionSpecType != EST_Delayed); 7138 7139 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7140 } 7141 7142 // If the default constructor is explicitly defaulted, checking the exception 7143 // specification is deferred until now. 7144 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 7145 !ClassDecl->isDependentType()) 7146 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 7147} 7148 7149void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 7150 // We start with an initial pass over the base classes to collect those that 7151 // inherit constructors from. If there are none, we can forgo all further 7152 // processing. 7153 typedef SmallVector<const RecordType *, 4> BasesVector; 7154 BasesVector BasesToInheritFrom; 7155 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 7156 BaseE = ClassDecl->bases_end(); 7157 BaseIt != BaseE; ++BaseIt) { 7158 if (BaseIt->getInheritConstructors()) { 7159 QualType Base = BaseIt->getType(); 7160 if (Base->isDependentType()) { 7161 // If we inherit constructors from anything that is dependent, just 7162 // abort processing altogether. We'll get another chance for the 7163 // instantiations. 7164 return; 7165 } 7166 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 7167 } 7168 } 7169 if (BasesToInheritFrom.empty()) 7170 return; 7171 7172 // Now collect the constructors that we already have in the current class. 7173 // Those take precedence over inherited constructors. 7174 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 7175 // unless there is a user-declared constructor with the same signature in 7176 // the class where the using-declaration appears. 7177 llvm::SmallSet<const Type *, 8> ExistingConstructors; 7178 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 7179 CtorE = ClassDecl->ctor_end(); 7180 CtorIt != CtorE; ++CtorIt) { 7181 ExistingConstructors.insert( 7182 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 7183 } 7184 7185 Scope *S = getScopeForContext(ClassDecl); 7186 DeclarationName CreatedCtorName = 7187 Context.DeclarationNames.getCXXConstructorName( 7188 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 7189 7190 // Now comes the true work. 7191 // First, we keep a map from constructor types to the base that introduced 7192 // them. Needed for finding conflicting constructors. We also keep the 7193 // actually inserted declarations in there, for pretty diagnostics. 7194 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 7195 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 7196 ConstructorToSourceMap InheritedConstructors; 7197 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 7198 BaseE = BasesToInheritFrom.end(); 7199 BaseIt != BaseE; ++BaseIt) { 7200 const RecordType *Base = *BaseIt; 7201 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 7202 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 7203 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 7204 CtorE = BaseDecl->ctor_end(); 7205 CtorIt != CtorE; ++CtorIt) { 7206 // Find the using declaration for inheriting this base's constructors. 7207 DeclarationName Name = 7208 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 7209 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 7210 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 7211 SourceLocation UsingLoc = UD ? UD->getLocation() : 7212 ClassDecl->getLocation(); 7213 7214 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 7215 // from the class X named in the using-declaration consists of actual 7216 // constructors and notional constructors that result from the 7217 // transformation of defaulted parameters as follows: 7218 // - all non-template default constructors of X, and 7219 // - for each non-template constructor of X that has at least one 7220 // parameter with a default argument, the set of constructors that 7221 // results from omitting any ellipsis parameter specification and 7222 // successively omitting parameters with a default argument from the 7223 // end of the parameter-type-list. 7224 CXXConstructorDecl *BaseCtor = *CtorIt; 7225 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 7226 const FunctionProtoType *BaseCtorType = 7227 BaseCtor->getType()->getAs<FunctionProtoType>(); 7228 7229 for (unsigned params = BaseCtor->getMinRequiredArguments(), 7230 maxParams = BaseCtor->getNumParams(); 7231 params <= maxParams; ++params) { 7232 // Skip default constructors. They're never inherited. 7233 if (params == 0) 7234 continue; 7235 // Skip copy and move constructors for the same reason. 7236 if (CanBeCopyOrMove && params == 1) 7237 continue; 7238 7239 // Build up a function type for this particular constructor. 7240 // FIXME: The working paper does not consider that the exception spec 7241 // for the inheriting constructor might be larger than that of the 7242 // source. This code doesn't yet, either. When it does, this code will 7243 // need to be delayed until after exception specifications and in-class 7244 // member initializers are attached. 7245 const Type *NewCtorType; 7246 if (params == maxParams) 7247 NewCtorType = BaseCtorType; 7248 else { 7249 SmallVector<QualType, 16> Args; 7250 for (unsigned i = 0; i < params; ++i) { 7251 Args.push_back(BaseCtorType->getArgType(i)); 7252 } 7253 FunctionProtoType::ExtProtoInfo ExtInfo = 7254 BaseCtorType->getExtProtoInfo(); 7255 ExtInfo.Variadic = false; 7256 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7257 Args.data(), params, ExtInfo) 7258 .getTypePtr(); 7259 } 7260 const Type *CanonicalNewCtorType = 7261 Context.getCanonicalType(NewCtorType); 7262 7263 // Now that we have the type, first check if the class already has a 7264 // constructor with this signature. 7265 if (ExistingConstructors.count(CanonicalNewCtorType)) 7266 continue; 7267 7268 // Then we check if we have already declared an inherited constructor 7269 // with this signature. 7270 std::pair<ConstructorToSourceMap::iterator, bool> result = 7271 InheritedConstructors.insert(std::make_pair( 7272 CanonicalNewCtorType, 7273 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7274 if (!result.second) { 7275 // Already in the map. If it came from a different class, that's an 7276 // error. Not if it's from the same. 7277 CanQualType PreviousBase = result.first->second.first; 7278 if (CanonicalBase != PreviousBase) { 7279 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7280 const CXXConstructorDecl *PrevBaseCtor = 7281 PrevCtor->getInheritedConstructor(); 7282 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7283 7284 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7285 Diag(BaseCtor->getLocation(), 7286 diag::note_using_decl_constructor_conflict_current_ctor); 7287 Diag(PrevBaseCtor->getLocation(), 7288 diag::note_using_decl_constructor_conflict_previous_ctor); 7289 Diag(PrevCtor->getLocation(), 7290 diag::note_using_decl_constructor_conflict_previous_using); 7291 } 7292 continue; 7293 } 7294 7295 // OK, we're there, now add the constructor. 7296 // C++0x [class.inhctor]p8: [...] that would be performed by a 7297 // user-written inline constructor [...] 7298 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7299 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7300 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7301 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7302 /*ImplicitlyDeclared=*/true, 7303 // FIXME: Due to a defect in the standard, we treat inherited 7304 // constructors as constexpr even if that makes them ill-formed. 7305 /*Constexpr=*/BaseCtor->isConstexpr()); 7306 NewCtor->setAccess(BaseCtor->getAccess()); 7307 7308 // Build up the parameter decls and add them. 7309 SmallVector<ParmVarDecl *, 16> ParamDecls; 7310 for (unsigned i = 0; i < params; ++i) { 7311 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7312 UsingLoc, UsingLoc, 7313 /*IdentifierInfo=*/0, 7314 BaseCtorType->getArgType(i), 7315 /*TInfo=*/0, SC_None, 7316 SC_None, /*DefaultArg=*/0)); 7317 } 7318 NewCtor->setParams(ParamDecls); 7319 NewCtor->setInheritedConstructor(BaseCtor); 7320 7321 PushOnScopeChains(NewCtor, S, false); 7322 ClassDecl->addDecl(NewCtor); 7323 result.first->second.second = NewCtor; 7324 } 7325 } 7326 } 7327} 7328 7329Sema::ImplicitExceptionSpecification 7330Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7331 // C++ [except.spec]p14: 7332 // An implicitly declared special member function (Clause 12) shall have 7333 // an exception-specification. 7334 ImplicitExceptionSpecification ExceptSpec(Context); 7335 if (ClassDecl->isInvalidDecl()) 7336 return ExceptSpec; 7337 7338 // Direct base-class destructors. 7339 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7340 BEnd = ClassDecl->bases_end(); 7341 B != BEnd; ++B) { 7342 if (B->isVirtual()) // Handled below. 7343 continue; 7344 7345 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7346 ExceptSpec.CalledDecl( 7347 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7348 } 7349 7350 // Virtual base-class destructors. 7351 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7352 BEnd = ClassDecl->vbases_end(); 7353 B != BEnd; ++B) { 7354 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7355 ExceptSpec.CalledDecl( 7356 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7357 } 7358 7359 // Field destructors. 7360 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7361 FEnd = ClassDecl->field_end(); 7362 F != FEnd; ++F) { 7363 if (const RecordType *RecordTy 7364 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7365 ExceptSpec.CalledDecl( 7366 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7367 } 7368 7369 return ExceptSpec; 7370} 7371 7372CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7373 // C++ [class.dtor]p2: 7374 // If a class has no user-declared destructor, a destructor is 7375 // declared implicitly. An implicitly-declared destructor is an 7376 // inline public member of its class. 7377 7378 ImplicitExceptionSpecification Spec = 7379 ComputeDefaultedDtorExceptionSpec(ClassDecl); 7380 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7381 7382 // Create the actual destructor declaration. 7383 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 7384 7385 CanQualType ClassType 7386 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7387 SourceLocation ClassLoc = ClassDecl->getLocation(); 7388 DeclarationName Name 7389 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7390 DeclarationNameInfo NameInfo(Name, ClassLoc); 7391 CXXDestructorDecl *Destructor 7392 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 7393 /*isInline=*/true, 7394 /*isImplicitlyDeclared=*/true); 7395 Destructor->setAccess(AS_public); 7396 Destructor->setDefaulted(); 7397 Destructor->setImplicit(); 7398 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7399 7400 // Note that we have declared this destructor. 7401 ++ASTContext::NumImplicitDestructorsDeclared; 7402 7403 // Introduce this destructor into its scope. 7404 if (Scope *S = getScopeForContext(ClassDecl)) 7405 PushOnScopeChains(Destructor, S, false); 7406 ClassDecl->addDecl(Destructor); 7407 7408 // This could be uniqued if it ever proves significant. 7409 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 7410 7411 if (ShouldDeleteDestructor(Destructor)) 7412 Destructor->setDeletedAsWritten(); 7413 7414 AddOverriddenMethods(ClassDecl, Destructor); 7415 7416 return Destructor; 7417} 7418 7419void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7420 CXXDestructorDecl *Destructor) { 7421 assert((Destructor->isDefaulted() && 7422 !Destructor->doesThisDeclarationHaveABody()) && 7423 "DefineImplicitDestructor - call it for implicit default dtor"); 7424 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7425 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7426 7427 if (Destructor->isInvalidDecl()) 7428 return; 7429 7430 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7431 7432 DiagnosticErrorTrap Trap(Diags); 7433 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7434 Destructor->getParent()); 7435 7436 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7437 Diag(CurrentLocation, diag::note_member_synthesized_at) 7438 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7439 7440 Destructor->setInvalidDecl(); 7441 return; 7442 } 7443 7444 SourceLocation Loc = Destructor->getLocation(); 7445 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7446 Destructor->setImplicitlyDefined(true); 7447 Destructor->setUsed(); 7448 MarkVTableUsed(CurrentLocation, ClassDecl); 7449 7450 if (ASTMutationListener *L = getASTMutationListener()) { 7451 L->CompletedImplicitDefinition(Destructor); 7452 } 7453} 7454 7455void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 7456 CXXDestructorDecl *destructor) { 7457 // C++11 [class.dtor]p3: 7458 // A declaration of a destructor that does not have an exception- 7459 // specification is implicitly considered to have the same exception- 7460 // specification as an implicit declaration. 7461 const FunctionProtoType *dtorType = destructor->getType()-> 7462 getAs<FunctionProtoType>(); 7463 if (dtorType->hasExceptionSpec()) 7464 return; 7465 7466 ImplicitExceptionSpecification exceptSpec = 7467 ComputeDefaultedDtorExceptionSpec(classDecl); 7468 7469 // Replace the destructor's type, building off the existing one. Fortunately, 7470 // the only thing of interest in the destructor type is its extended info. 7471 // The return and arguments are fixed. 7472 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 7473 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 7474 epi.NumExceptions = exceptSpec.size(); 7475 epi.Exceptions = exceptSpec.data(); 7476 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 7477 7478 destructor->setType(ty); 7479 7480 // FIXME: If the destructor has a body that could throw, and the newly created 7481 // spec doesn't allow exceptions, we should emit a warning, because this 7482 // change in behavior can break conforming C++03 programs at runtime. 7483 // However, we don't have a body yet, so it needs to be done somewhere else. 7484} 7485 7486/// \brief Builds a statement that copies/moves the given entity from \p From to 7487/// \c To. 7488/// 7489/// This routine is used to copy/move the members of a class with an 7490/// implicitly-declared copy/move assignment operator. When the entities being 7491/// copied are arrays, this routine builds for loops to copy them. 7492/// 7493/// \param S The Sema object used for type-checking. 7494/// 7495/// \param Loc The location where the implicit copy/move is being generated. 7496/// 7497/// \param T The type of the expressions being copied/moved. Both expressions 7498/// must have this type. 7499/// 7500/// \param To The expression we are copying/moving to. 7501/// 7502/// \param From The expression we are copying/moving from. 7503/// 7504/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7505/// Otherwise, it's a non-static member subobject. 7506/// 7507/// \param Copying Whether we're copying or moving. 7508/// 7509/// \param Depth Internal parameter recording the depth of the recursion. 7510/// 7511/// \returns A statement or a loop that copies the expressions. 7512static StmtResult 7513BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7514 Expr *To, Expr *From, 7515 bool CopyingBaseSubobject, bool Copying, 7516 unsigned Depth = 0) { 7517 // C++0x [class.copy]p28: 7518 // Each subobject is assigned in the manner appropriate to its type: 7519 // 7520 // - if the subobject is of class type, as if by a call to operator= with 7521 // the subobject as the object expression and the corresponding 7522 // subobject of x as a single function argument (as if by explicit 7523 // qualification; that is, ignoring any possible virtual overriding 7524 // functions in more derived classes); 7525 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7526 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7527 7528 // Look for operator=. 7529 DeclarationName Name 7530 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7531 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7532 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7533 7534 // Filter out any result that isn't a copy/move-assignment operator. 7535 LookupResult::Filter F = OpLookup.makeFilter(); 7536 while (F.hasNext()) { 7537 NamedDecl *D = F.next(); 7538 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7539 if (Copying ? Method->isCopyAssignmentOperator() : 7540 Method->isMoveAssignmentOperator()) 7541 continue; 7542 7543 F.erase(); 7544 } 7545 F.done(); 7546 7547 // Suppress the protected check (C++ [class.protected]) for each of the 7548 // assignment operators we found. This strange dance is required when 7549 // we're assigning via a base classes's copy-assignment operator. To 7550 // ensure that we're getting the right base class subobject (without 7551 // ambiguities), we need to cast "this" to that subobject type; to 7552 // ensure that we don't go through the virtual call mechanism, we need 7553 // to qualify the operator= name with the base class (see below). However, 7554 // this means that if the base class has a protected copy assignment 7555 // operator, the protected member access check will fail. So, we 7556 // rewrite "protected" access to "public" access in this case, since we 7557 // know by construction that we're calling from a derived class. 7558 if (CopyingBaseSubobject) { 7559 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7560 L != LEnd; ++L) { 7561 if (L.getAccess() == AS_protected) 7562 L.setAccess(AS_public); 7563 } 7564 } 7565 7566 // Create the nested-name-specifier that will be used to qualify the 7567 // reference to operator=; this is required to suppress the virtual 7568 // call mechanism. 7569 CXXScopeSpec SS; 7570 SS.MakeTrivial(S.Context, 7571 NestedNameSpecifier::Create(S.Context, 0, false, 7572 T.getTypePtr()), 7573 Loc); 7574 7575 // Create the reference to operator=. 7576 ExprResult OpEqualRef 7577 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7578 /*FirstQualifierInScope=*/0, OpLookup, 7579 /*TemplateArgs=*/0, 7580 /*SuppressQualifierCheck=*/true); 7581 if (OpEqualRef.isInvalid()) 7582 return StmtError(); 7583 7584 // Build the call to the assignment operator. 7585 7586 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7587 OpEqualRef.takeAs<Expr>(), 7588 Loc, &From, 1, Loc); 7589 if (Call.isInvalid()) 7590 return StmtError(); 7591 7592 return S.Owned(Call.takeAs<Stmt>()); 7593 } 7594 7595 // - if the subobject is of scalar type, the built-in assignment 7596 // operator is used. 7597 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7598 if (!ArrayTy) { 7599 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7600 if (Assignment.isInvalid()) 7601 return StmtError(); 7602 7603 return S.Owned(Assignment.takeAs<Stmt>()); 7604 } 7605 7606 // - if the subobject is an array, each element is assigned, in the 7607 // manner appropriate to the element type; 7608 7609 // Construct a loop over the array bounds, e.g., 7610 // 7611 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7612 // 7613 // that will copy each of the array elements. 7614 QualType SizeType = S.Context.getSizeType(); 7615 7616 // Create the iteration variable. 7617 IdentifierInfo *IterationVarName = 0; 7618 { 7619 llvm::SmallString<8> Str; 7620 llvm::raw_svector_ostream OS(Str); 7621 OS << "__i" << Depth; 7622 IterationVarName = &S.Context.Idents.get(OS.str()); 7623 } 7624 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7625 IterationVarName, SizeType, 7626 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7627 SC_None, SC_None); 7628 7629 // Initialize the iteration variable to zero. 7630 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7631 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7632 7633 // Create a reference to the iteration variable; we'll use this several 7634 // times throughout. 7635 Expr *IterationVarRef 7636 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 7637 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7638 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 7639 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 7640 7641 // Create the DeclStmt that holds the iteration variable. 7642 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7643 7644 // Create the comparison against the array bound. 7645 llvm::APInt Upper 7646 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7647 Expr *Comparison 7648 = new (S.Context) BinaryOperator(IterationVarRefRVal, 7649 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7650 BO_NE, S.Context.BoolTy, 7651 VK_RValue, OK_Ordinary, Loc); 7652 7653 // Create the pre-increment of the iteration variable. 7654 Expr *Increment 7655 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7656 VK_LValue, OK_Ordinary, Loc); 7657 7658 // Subscript the "from" and "to" expressions with the iteration variable. 7659 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7660 IterationVarRefRVal, 7661 Loc)); 7662 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7663 IterationVarRefRVal, 7664 Loc)); 7665 if (!Copying) // Cast to rvalue 7666 From = CastForMoving(S, From); 7667 7668 // Build the copy/move for an individual element of the array. 7669 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7670 To, From, CopyingBaseSubobject, 7671 Copying, Depth + 1); 7672 if (Copy.isInvalid()) 7673 return StmtError(); 7674 7675 // Construct the loop that copies all elements of this array. 7676 return S.ActOnForStmt(Loc, Loc, InitStmt, 7677 S.MakeFullExpr(Comparison), 7678 0, S.MakeFullExpr(Increment), 7679 Loc, Copy.take()); 7680} 7681 7682std::pair<Sema::ImplicitExceptionSpecification, bool> 7683Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7684 CXXRecordDecl *ClassDecl) { 7685 if (ClassDecl->isInvalidDecl()) 7686 return std::make_pair(ImplicitExceptionSpecification(Context), false); 7687 7688 // C++ [class.copy]p10: 7689 // If the class definition does not explicitly declare a copy 7690 // assignment operator, one is declared implicitly. 7691 // The implicitly-defined copy assignment operator for a class X 7692 // will have the form 7693 // 7694 // X& X::operator=(const X&) 7695 // 7696 // if 7697 bool HasConstCopyAssignment = true; 7698 7699 // -- each direct base class B of X has a copy assignment operator 7700 // whose parameter is of type const B&, const volatile B& or B, 7701 // and 7702 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7703 BaseEnd = ClassDecl->bases_end(); 7704 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7705 // We'll handle this below 7706 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7707 continue; 7708 7709 assert(!Base->getType()->isDependentType() && 7710 "Cannot generate implicit members for class with dependent bases."); 7711 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7712 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7713 &HasConstCopyAssignment); 7714 } 7715 7716 // In C++11, the above citation has "or virtual" added 7717 if (LangOpts.CPlusPlus0x) { 7718 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7719 BaseEnd = ClassDecl->vbases_end(); 7720 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7721 assert(!Base->getType()->isDependentType() && 7722 "Cannot generate implicit members for class with dependent bases."); 7723 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7724 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7725 &HasConstCopyAssignment); 7726 } 7727 } 7728 7729 // -- for all the nonstatic data members of X that are of a class 7730 // type M (or array thereof), each such class type has a copy 7731 // assignment operator whose parameter is of type const M&, 7732 // const volatile M& or M. 7733 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7734 FieldEnd = ClassDecl->field_end(); 7735 HasConstCopyAssignment && Field != FieldEnd; 7736 ++Field) { 7737 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7738 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7739 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 7740 &HasConstCopyAssignment); 7741 } 7742 } 7743 7744 // Otherwise, the implicitly declared copy assignment operator will 7745 // have the form 7746 // 7747 // X& X::operator=(X&) 7748 7749 // C++ [except.spec]p14: 7750 // An implicitly declared special member function (Clause 12) shall have an 7751 // exception-specification. [...] 7752 7753 // It is unspecified whether or not an implicit copy assignment operator 7754 // attempts to deduplicate calls to assignment operators of virtual bases are 7755 // made. As such, this exception specification is effectively unspecified. 7756 // Based on a similar decision made for constness in C++0x, we're erring on 7757 // the side of assuming such calls to be made regardless of whether they 7758 // actually happen. 7759 ImplicitExceptionSpecification ExceptSpec(Context); 7760 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7761 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7762 BaseEnd = ClassDecl->bases_end(); 7763 Base != BaseEnd; ++Base) { 7764 if (Base->isVirtual()) 7765 continue; 7766 7767 CXXRecordDecl *BaseClassDecl 7768 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7769 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7770 ArgQuals, false, 0)) 7771 ExceptSpec.CalledDecl(CopyAssign); 7772 } 7773 7774 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7775 BaseEnd = ClassDecl->vbases_end(); 7776 Base != BaseEnd; ++Base) { 7777 CXXRecordDecl *BaseClassDecl 7778 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7779 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7780 ArgQuals, false, 0)) 7781 ExceptSpec.CalledDecl(CopyAssign); 7782 } 7783 7784 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7785 FieldEnd = ClassDecl->field_end(); 7786 Field != FieldEnd; 7787 ++Field) { 7788 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7789 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7790 if (CXXMethodDecl *CopyAssign = 7791 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7792 ExceptSpec.CalledDecl(CopyAssign); 7793 } 7794 } 7795 7796 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7797} 7798 7799CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7800 // Note: The following rules are largely analoguous to the copy 7801 // constructor rules. Note that virtual bases are not taken into account 7802 // for determining the argument type of the operator. Note also that 7803 // operators taking an object instead of a reference are allowed. 7804 7805 ImplicitExceptionSpecification Spec(Context); 7806 bool Const; 7807 llvm::tie(Spec, Const) = 7808 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7809 7810 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7811 QualType RetType = Context.getLValueReferenceType(ArgType); 7812 if (Const) 7813 ArgType = ArgType.withConst(); 7814 ArgType = Context.getLValueReferenceType(ArgType); 7815 7816 // An implicitly-declared copy assignment operator is an inline public 7817 // member of its class. 7818 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7819 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7820 SourceLocation ClassLoc = ClassDecl->getLocation(); 7821 DeclarationNameInfo NameInfo(Name, ClassLoc); 7822 CXXMethodDecl *CopyAssignment 7823 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7824 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7825 /*TInfo=*/0, /*isStatic=*/false, 7826 /*StorageClassAsWritten=*/SC_None, 7827 /*isInline=*/true, /*isConstexpr=*/false, 7828 SourceLocation()); 7829 CopyAssignment->setAccess(AS_public); 7830 CopyAssignment->setDefaulted(); 7831 CopyAssignment->setImplicit(); 7832 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7833 7834 // Add the parameter to the operator. 7835 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7836 ClassLoc, ClassLoc, /*Id=*/0, 7837 ArgType, /*TInfo=*/0, 7838 SC_None, 7839 SC_None, 0); 7840 CopyAssignment->setParams(FromParam); 7841 7842 // Note that we have added this copy-assignment operator. 7843 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7844 7845 if (Scope *S = getScopeForContext(ClassDecl)) 7846 PushOnScopeChains(CopyAssignment, S, false); 7847 ClassDecl->addDecl(CopyAssignment); 7848 7849 // C++0x [class.copy]p19: 7850 // .... If the class definition does not explicitly declare a copy 7851 // assignment operator, there is no user-declared move constructor, and 7852 // there is no user-declared move assignment operator, a copy assignment 7853 // operator is implicitly declared as defaulted. 7854 if ((ClassDecl->hasUserDeclaredMoveConstructor() && 7855 !getLangOptions().MicrosoftExt) || 7856 ClassDecl->hasUserDeclaredMoveAssignment() && 7857 ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 7858 CopyAssignment->setDeletedAsWritten(); 7859 7860 AddOverriddenMethods(ClassDecl, CopyAssignment); 7861 return CopyAssignment; 7862} 7863 7864void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7865 CXXMethodDecl *CopyAssignOperator) { 7866 assert((CopyAssignOperator->isDefaulted() && 7867 CopyAssignOperator->isOverloadedOperator() && 7868 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7869 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 7870 "DefineImplicitCopyAssignment called for wrong function"); 7871 7872 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7873 7874 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7875 CopyAssignOperator->setInvalidDecl(); 7876 return; 7877 } 7878 7879 CopyAssignOperator->setUsed(); 7880 7881 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7882 DiagnosticErrorTrap Trap(Diags); 7883 7884 // C++0x [class.copy]p30: 7885 // The implicitly-defined or explicitly-defaulted copy assignment operator 7886 // for a non-union class X performs memberwise copy assignment of its 7887 // subobjects. The direct base classes of X are assigned first, in the 7888 // order of their declaration in the base-specifier-list, and then the 7889 // immediate non-static data members of X are assigned, in the order in 7890 // which they were declared in the class definition. 7891 7892 // The statements that form the synthesized function body. 7893 ASTOwningVector<Stmt*> Statements(*this); 7894 7895 // The parameter for the "other" object, which we are copying from. 7896 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7897 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7898 QualType OtherRefType = Other->getType(); 7899 if (const LValueReferenceType *OtherRef 7900 = OtherRefType->getAs<LValueReferenceType>()) { 7901 OtherRefType = OtherRef->getPointeeType(); 7902 OtherQuals = OtherRefType.getQualifiers(); 7903 } 7904 7905 // Our location for everything implicitly-generated. 7906 SourceLocation Loc = CopyAssignOperator->getLocation(); 7907 7908 // Construct a reference to the "other" object. We'll be using this 7909 // throughout the generated ASTs. 7910 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7911 assert(OtherRef && "Reference to parameter cannot fail!"); 7912 7913 // Construct the "this" pointer. We'll be using this throughout the generated 7914 // ASTs. 7915 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7916 assert(This && "Reference to this cannot fail!"); 7917 7918 // Assign base classes. 7919 bool Invalid = false; 7920 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7921 E = ClassDecl->bases_end(); Base != E; ++Base) { 7922 // Form the assignment: 7923 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7924 QualType BaseType = Base->getType().getUnqualifiedType(); 7925 if (!BaseType->isRecordType()) { 7926 Invalid = true; 7927 continue; 7928 } 7929 7930 CXXCastPath BasePath; 7931 BasePath.push_back(Base); 7932 7933 // Construct the "from" expression, which is an implicit cast to the 7934 // appropriately-qualified base type. 7935 Expr *From = OtherRef; 7936 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7937 CK_UncheckedDerivedToBase, 7938 VK_LValue, &BasePath).take(); 7939 7940 // Dereference "this". 7941 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7942 7943 // Implicitly cast "this" to the appropriately-qualified base type. 7944 To = ImpCastExprToType(To.take(), 7945 Context.getCVRQualifiedType(BaseType, 7946 CopyAssignOperator->getTypeQualifiers()), 7947 CK_UncheckedDerivedToBase, 7948 VK_LValue, &BasePath); 7949 7950 // Build the copy. 7951 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7952 To.get(), From, 7953 /*CopyingBaseSubobject=*/true, 7954 /*Copying=*/true); 7955 if (Copy.isInvalid()) { 7956 Diag(CurrentLocation, diag::note_member_synthesized_at) 7957 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7958 CopyAssignOperator->setInvalidDecl(); 7959 return; 7960 } 7961 7962 // Success! Record the copy. 7963 Statements.push_back(Copy.takeAs<Expr>()); 7964 } 7965 7966 // \brief Reference to the __builtin_memcpy function. 7967 Expr *BuiltinMemCpyRef = 0; 7968 // \brief Reference to the __builtin_objc_memmove_collectable function. 7969 Expr *CollectableMemCpyRef = 0; 7970 7971 // Assign non-static members. 7972 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7973 FieldEnd = ClassDecl->field_end(); 7974 Field != FieldEnd; ++Field) { 7975 if (Field->isUnnamedBitfield()) 7976 continue; 7977 7978 // Check for members of reference type; we can't copy those. 7979 if (Field->getType()->isReferenceType()) { 7980 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7981 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7982 Diag(Field->getLocation(), diag::note_declared_at); 7983 Diag(CurrentLocation, diag::note_member_synthesized_at) 7984 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7985 Invalid = true; 7986 continue; 7987 } 7988 7989 // Check for members of const-qualified, non-class type. 7990 QualType BaseType = Context.getBaseElementType(Field->getType()); 7991 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7992 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7993 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7994 Diag(Field->getLocation(), diag::note_declared_at); 7995 Diag(CurrentLocation, diag::note_member_synthesized_at) 7996 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7997 Invalid = true; 7998 continue; 7999 } 8000 8001 // Suppress assigning zero-width bitfields. 8002 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8003 continue; 8004 8005 QualType FieldType = Field->getType().getNonReferenceType(); 8006 if (FieldType->isIncompleteArrayType()) { 8007 assert(ClassDecl->hasFlexibleArrayMember() && 8008 "Incomplete array type is not valid"); 8009 continue; 8010 } 8011 8012 // Build references to the field in the object we're copying from and to. 8013 CXXScopeSpec SS; // Intentionally empty 8014 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8015 LookupMemberName); 8016 MemberLookup.addDecl(*Field); 8017 MemberLookup.resolveKind(); 8018 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8019 Loc, /*IsArrow=*/false, 8020 SS, 0, MemberLookup, 0); 8021 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8022 Loc, /*IsArrow=*/true, 8023 SS, 0, MemberLookup, 0); 8024 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8025 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8026 8027 // If the field should be copied with __builtin_memcpy rather than via 8028 // explicit assignments, do so. This optimization only applies for arrays 8029 // of scalars and arrays of class type with trivial copy-assignment 8030 // operators. 8031 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8032 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 8033 // Compute the size of the memory buffer to be copied. 8034 QualType SizeType = Context.getSizeType(); 8035 llvm::APInt Size(Context.getTypeSize(SizeType), 8036 Context.getTypeSizeInChars(BaseType).getQuantity()); 8037 for (const ConstantArrayType *Array 8038 = Context.getAsConstantArrayType(FieldType); 8039 Array; 8040 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8041 llvm::APInt ArraySize 8042 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8043 Size *= ArraySize; 8044 } 8045 8046 // Take the address of the field references for "from" and "to". 8047 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 8048 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 8049 8050 bool NeedsCollectableMemCpy = 8051 (BaseType->isRecordType() && 8052 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8053 8054 if (NeedsCollectableMemCpy) { 8055 if (!CollectableMemCpyRef) { 8056 // Create a reference to the __builtin_objc_memmove_collectable function. 8057 LookupResult R(*this, 8058 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8059 Loc, LookupOrdinaryName); 8060 LookupName(R, TUScope, true); 8061 8062 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8063 if (!CollectableMemCpy) { 8064 // Something went horribly wrong earlier, and we will have 8065 // complained about it. 8066 Invalid = true; 8067 continue; 8068 } 8069 8070 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8071 CollectableMemCpy->getType(), 8072 VK_LValue, Loc, 0).take(); 8073 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8074 } 8075 } 8076 // Create a reference to the __builtin_memcpy builtin function. 8077 else if (!BuiltinMemCpyRef) { 8078 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8079 LookupOrdinaryName); 8080 LookupName(R, TUScope, true); 8081 8082 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8083 if (!BuiltinMemCpy) { 8084 // Something went horribly wrong earlier, and we will have complained 8085 // about it. 8086 Invalid = true; 8087 continue; 8088 } 8089 8090 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8091 BuiltinMemCpy->getType(), 8092 VK_LValue, Loc, 0).take(); 8093 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8094 } 8095 8096 ASTOwningVector<Expr*> CallArgs(*this); 8097 CallArgs.push_back(To.takeAs<Expr>()); 8098 CallArgs.push_back(From.takeAs<Expr>()); 8099 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8100 ExprResult Call = ExprError(); 8101 if (NeedsCollectableMemCpy) 8102 Call = ActOnCallExpr(/*Scope=*/0, 8103 CollectableMemCpyRef, 8104 Loc, move_arg(CallArgs), 8105 Loc); 8106 else 8107 Call = ActOnCallExpr(/*Scope=*/0, 8108 BuiltinMemCpyRef, 8109 Loc, move_arg(CallArgs), 8110 Loc); 8111 8112 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8113 Statements.push_back(Call.takeAs<Expr>()); 8114 continue; 8115 } 8116 8117 // Build the copy of this field. 8118 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 8119 To.get(), From.get(), 8120 /*CopyingBaseSubobject=*/false, 8121 /*Copying=*/true); 8122 if (Copy.isInvalid()) { 8123 Diag(CurrentLocation, diag::note_member_synthesized_at) 8124 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8125 CopyAssignOperator->setInvalidDecl(); 8126 return; 8127 } 8128 8129 // Success! Record the copy. 8130 Statements.push_back(Copy.takeAs<Stmt>()); 8131 } 8132 8133 if (!Invalid) { 8134 // Add a "return *this;" 8135 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8136 8137 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8138 if (Return.isInvalid()) 8139 Invalid = true; 8140 else { 8141 Statements.push_back(Return.takeAs<Stmt>()); 8142 8143 if (Trap.hasErrorOccurred()) { 8144 Diag(CurrentLocation, diag::note_member_synthesized_at) 8145 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8146 Invalid = true; 8147 } 8148 } 8149 } 8150 8151 if (Invalid) { 8152 CopyAssignOperator->setInvalidDecl(); 8153 return; 8154 } 8155 8156 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8157 /*isStmtExpr=*/false); 8158 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8159 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 8160 8161 if (ASTMutationListener *L = getASTMutationListener()) { 8162 L->CompletedImplicitDefinition(CopyAssignOperator); 8163 } 8164} 8165 8166Sema::ImplicitExceptionSpecification 8167Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 8168 ImplicitExceptionSpecification ExceptSpec(Context); 8169 8170 if (ClassDecl->isInvalidDecl()) 8171 return ExceptSpec; 8172 8173 // C++0x [except.spec]p14: 8174 // An implicitly declared special member function (Clause 12) shall have an 8175 // exception-specification. [...] 8176 8177 // It is unspecified whether or not an implicit move assignment operator 8178 // attempts to deduplicate calls to assignment operators of virtual bases are 8179 // made. As such, this exception specification is effectively unspecified. 8180 // Based on a similar decision made for constness in C++0x, we're erring on 8181 // the side of assuming such calls to be made regardless of whether they 8182 // actually happen. 8183 // Note that a move constructor is not implicitly declared when there are 8184 // virtual bases, but it can still be user-declared and explicitly defaulted. 8185 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8186 BaseEnd = ClassDecl->bases_end(); 8187 Base != BaseEnd; ++Base) { 8188 if (Base->isVirtual()) 8189 continue; 8190 8191 CXXRecordDecl *BaseClassDecl 8192 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8193 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8194 false, 0)) 8195 ExceptSpec.CalledDecl(MoveAssign); 8196 } 8197 8198 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8199 BaseEnd = ClassDecl->vbases_end(); 8200 Base != BaseEnd; ++Base) { 8201 CXXRecordDecl *BaseClassDecl 8202 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8203 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8204 false, 0)) 8205 ExceptSpec.CalledDecl(MoveAssign); 8206 } 8207 8208 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8209 FieldEnd = ClassDecl->field_end(); 8210 Field != FieldEnd; 8211 ++Field) { 8212 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8213 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8214 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 8215 false, 0)) 8216 ExceptSpec.CalledDecl(MoveAssign); 8217 } 8218 } 8219 8220 return ExceptSpec; 8221} 8222 8223CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8224 // Note: The following rules are largely analoguous to the move 8225 // constructor rules. 8226 8227 ImplicitExceptionSpecification Spec( 8228 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 8229 8230 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8231 QualType RetType = Context.getLValueReferenceType(ArgType); 8232 ArgType = Context.getRValueReferenceType(ArgType); 8233 8234 // An implicitly-declared move assignment operator is an inline public 8235 // member of its class. 8236 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8237 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8238 SourceLocation ClassLoc = ClassDecl->getLocation(); 8239 DeclarationNameInfo NameInfo(Name, ClassLoc); 8240 CXXMethodDecl *MoveAssignment 8241 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8242 Context.getFunctionType(RetType, &ArgType, 1, EPI), 8243 /*TInfo=*/0, /*isStatic=*/false, 8244 /*StorageClassAsWritten=*/SC_None, 8245 /*isInline=*/true, 8246 /*isConstexpr=*/false, 8247 SourceLocation()); 8248 MoveAssignment->setAccess(AS_public); 8249 MoveAssignment->setDefaulted(); 8250 MoveAssignment->setImplicit(); 8251 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8252 8253 // Add the parameter to the operator. 8254 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8255 ClassLoc, ClassLoc, /*Id=*/0, 8256 ArgType, /*TInfo=*/0, 8257 SC_None, 8258 SC_None, 0); 8259 MoveAssignment->setParams(FromParam); 8260 8261 // Note that we have added this copy-assignment operator. 8262 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8263 8264 // C++0x [class.copy]p9: 8265 // If the definition of a class X does not explicitly declare a move 8266 // assignment operator, one will be implicitly declared as defaulted if and 8267 // only if: 8268 // [...] 8269 // - the move assignment operator would not be implicitly defined as 8270 // deleted. 8271 if (ShouldDeleteMoveAssignmentOperator(MoveAssignment)) { 8272 // Cache this result so that we don't try to generate this over and over 8273 // on every lookup, leaking memory and wasting time. 8274 ClassDecl->setFailedImplicitMoveAssignment(); 8275 return 0; 8276 } 8277 8278 if (Scope *S = getScopeForContext(ClassDecl)) 8279 PushOnScopeChains(MoveAssignment, S, false); 8280 ClassDecl->addDecl(MoveAssignment); 8281 8282 AddOverriddenMethods(ClassDecl, MoveAssignment); 8283 return MoveAssignment; 8284} 8285 8286void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8287 CXXMethodDecl *MoveAssignOperator) { 8288 assert((MoveAssignOperator->isDefaulted() && 8289 MoveAssignOperator->isOverloadedOperator() && 8290 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8291 !MoveAssignOperator->doesThisDeclarationHaveABody()) && 8292 "DefineImplicitMoveAssignment called for wrong function"); 8293 8294 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8295 8296 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8297 MoveAssignOperator->setInvalidDecl(); 8298 return; 8299 } 8300 8301 MoveAssignOperator->setUsed(); 8302 8303 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8304 DiagnosticErrorTrap Trap(Diags); 8305 8306 // C++0x [class.copy]p28: 8307 // The implicitly-defined or move assignment operator for a non-union class 8308 // X performs memberwise move assignment of its subobjects. The direct base 8309 // classes of X are assigned first, in the order of their declaration in the 8310 // base-specifier-list, and then the immediate non-static data members of X 8311 // are assigned, in the order in which they were declared in the class 8312 // definition. 8313 8314 // The statements that form the synthesized function body. 8315 ASTOwningVector<Stmt*> Statements(*this); 8316 8317 // The parameter for the "other" object, which we are move from. 8318 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8319 QualType OtherRefType = Other->getType()-> 8320 getAs<RValueReferenceType>()->getPointeeType(); 8321 assert(OtherRefType.getQualifiers() == 0 && 8322 "Bad argument type of defaulted move assignment"); 8323 8324 // Our location for everything implicitly-generated. 8325 SourceLocation Loc = MoveAssignOperator->getLocation(); 8326 8327 // Construct a reference to the "other" object. We'll be using this 8328 // throughout the generated ASTs. 8329 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8330 assert(OtherRef && "Reference to parameter cannot fail!"); 8331 // Cast to rvalue. 8332 OtherRef = CastForMoving(*this, OtherRef); 8333 8334 // Construct the "this" pointer. We'll be using this throughout the generated 8335 // ASTs. 8336 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8337 assert(This && "Reference to this cannot fail!"); 8338 8339 // Assign base classes. 8340 bool Invalid = false; 8341 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8342 E = ClassDecl->bases_end(); Base != E; ++Base) { 8343 // Form the assignment: 8344 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8345 QualType BaseType = Base->getType().getUnqualifiedType(); 8346 if (!BaseType->isRecordType()) { 8347 Invalid = true; 8348 continue; 8349 } 8350 8351 CXXCastPath BasePath; 8352 BasePath.push_back(Base); 8353 8354 // Construct the "from" expression, which is an implicit cast to the 8355 // appropriately-qualified base type. 8356 Expr *From = OtherRef; 8357 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8358 VK_XValue, &BasePath).take(); 8359 8360 // Dereference "this". 8361 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8362 8363 // Implicitly cast "this" to the appropriately-qualified base type. 8364 To = ImpCastExprToType(To.take(), 8365 Context.getCVRQualifiedType(BaseType, 8366 MoveAssignOperator->getTypeQualifiers()), 8367 CK_UncheckedDerivedToBase, 8368 VK_LValue, &BasePath); 8369 8370 // Build the move. 8371 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8372 To.get(), From, 8373 /*CopyingBaseSubobject=*/true, 8374 /*Copying=*/false); 8375 if (Move.isInvalid()) { 8376 Diag(CurrentLocation, diag::note_member_synthesized_at) 8377 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8378 MoveAssignOperator->setInvalidDecl(); 8379 return; 8380 } 8381 8382 // Success! Record the move. 8383 Statements.push_back(Move.takeAs<Expr>()); 8384 } 8385 8386 // \brief Reference to the __builtin_memcpy function. 8387 Expr *BuiltinMemCpyRef = 0; 8388 // \brief Reference to the __builtin_objc_memmove_collectable function. 8389 Expr *CollectableMemCpyRef = 0; 8390 8391 // Assign non-static members. 8392 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8393 FieldEnd = ClassDecl->field_end(); 8394 Field != FieldEnd; ++Field) { 8395 if (Field->isUnnamedBitfield()) 8396 continue; 8397 8398 // Check for members of reference type; we can't move those. 8399 if (Field->getType()->isReferenceType()) { 8400 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8401 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8402 Diag(Field->getLocation(), diag::note_declared_at); 8403 Diag(CurrentLocation, diag::note_member_synthesized_at) 8404 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8405 Invalid = true; 8406 continue; 8407 } 8408 8409 // Check for members of const-qualified, non-class type. 8410 QualType BaseType = Context.getBaseElementType(Field->getType()); 8411 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8412 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8413 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8414 Diag(Field->getLocation(), diag::note_declared_at); 8415 Diag(CurrentLocation, diag::note_member_synthesized_at) 8416 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8417 Invalid = true; 8418 continue; 8419 } 8420 8421 // Suppress assigning zero-width bitfields. 8422 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8423 continue; 8424 8425 QualType FieldType = Field->getType().getNonReferenceType(); 8426 if (FieldType->isIncompleteArrayType()) { 8427 assert(ClassDecl->hasFlexibleArrayMember() && 8428 "Incomplete array type is not valid"); 8429 continue; 8430 } 8431 8432 // Build references to the field in the object we're copying from and to. 8433 CXXScopeSpec SS; // Intentionally empty 8434 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8435 LookupMemberName); 8436 MemberLookup.addDecl(*Field); 8437 MemberLookup.resolveKind(); 8438 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8439 Loc, /*IsArrow=*/false, 8440 SS, 0, MemberLookup, 0); 8441 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8442 Loc, /*IsArrow=*/true, 8443 SS, 0, MemberLookup, 0); 8444 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8445 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8446 8447 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8448 "Member reference with rvalue base must be rvalue except for reference " 8449 "members, which aren't allowed for move assignment."); 8450 8451 // If the field should be copied with __builtin_memcpy rather than via 8452 // explicit assignments, do so. This optimization only applies for arrays 8453 // of scalars and arrays of class type with trivial move-assignment 8454 // operators. 8455 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8456 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8457 // Compute the size of the memory buffer to be copied. 8458 QualType SizeType = Context.getSizeType(); 8459 llvm::APInt Size(Context.getTypeSize(SizeType), 8460 Context.getTypeSizeInChars(BaseType).getQuantity()); 8461 for (const ConstantArrayType *Array 8462 = Context.getAsConstantArrayType(FieldType); 8463 Array; 8464 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8465 llvm::APInt ArraySize 8466 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8467 Size *= ArraySize; 8468 } 8469 8470 // Take the address of the field references for "from" and "to". We 8471 // directly construct UnaryOperators here because semantic analysis 8472 // does not permit us to take the address of an xvalue. 8473 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8474 Context.getPointerType(From.get()->getType()), 8475 VK_RValue, OK_Ordinary, Loc); 8476 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8477 Context.getPointerType(To.get()->getType()), 8478 VK_RValue, OK_Ordinary, Loc); 8479 8480 bool NeedsCollectableMemCpy = 8481 (BaseType->isRecordType() && 8482 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8483 8484 if (NeedsCollectableMemCpy) { 8485 if (!CollectableMemCpyRef) { 8486 // Create a reference to the __builtin_objc_memmove_collectable function. 8487 LookupResult R(*this, 8488 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8489 Loc, LookupOrdinaryName); 8490 LookupName(R, TUScope, true); 8491 8492 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8493 if (!CollectableMemCpy) { 8494 // Something went horribly wrong earlier, and we will have 8495 // complained about it. 8496 Invalid = true; 8497 continue; 8498 } 8499 8500 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8501 CollectableMemCpy->getType(), 8502 VK_LValue, Loc, 0).take(); 8503 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8504 } 8505 } 8506 // Create a reference to the __builtin_memcpy builtin function. 8507 else if (!BuiltinMemCpyRef) { 8508 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8509 LookupOrdinaryName); 8510 LookupName(R, TUScope, true); 8511 8512 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8513 if (!BuiltinMemCpy) { 8514 // Something went horribly wrong earlier, and we will have complained 8515 // about it. 8516 Invalid = true; 8517 continue; 8518 } 8519 8520 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8521 BuiltinMemCpy->getType(), 8522 VK_LValue, Loc, 0).take(); 8523 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8524 } 8525 8526 ASTOwningVector<Expr*> CallArgs(*this); 8527 CallArgs.push_back(To.takeAs<Expr>()); 8528 CallArgs.push_back(From.takeAs<Expr>()); 8529 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8530 ExprResult Call = ExprError(); 8531 if (NeedsCollectableMemCpy) 8532 Call = ActOnCallExpr(/*Scope=*/0, 8533 CollectableMemCpyRef, 8534 Loc, move_arg(CallArgs), 8535 Loc); 8536 else 8537 Call = ActOnCallExpr(/*Scope=*/0, 8538 BuiltinMemCpyRef, 8539 Loc, move_arg(CallArgs), 8540 Loc); 8541 8542 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8543 Statements.push_back(Call.takeAs<Expr>()); 8544 continue; 8545 } 8546 8547 // Build the move of this field. 8548 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8549 To.get(), From.get(), 8550 /*CopyingBaseSubobject=*/false, 8551 /*Copying=*/false); 8552 if (Move.isInvalid()) { 8553 Diag(CurrentLocation, diag::note_member_synthesized_at) 8554 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8555 MoveAssignOperator->setInvalidDecl(); 8556 return; 8557 } 8558 8559 // Success! Record the copy. 8560 Statements.push_back(Move.takeAs<Stmt>()); 8561 } 8562 8563 if (!Invalid) { 8564 // Add a "return *this;" 8565 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8566 8567 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8568 if (Return.isInvalid()) 8569 Invalid = true; 8570 else { 8571 Statements.push_back(Return.takeAs<Stmt>()); 8572 8573 if (Trap.hasErrorOccurred()) { 8574 Diag(CurrentLocation, diag::note_member_synthesized_at) 8575 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8576 Invalid = true; 8577 } 8578 } 8579 } 8580 8581 if (Invalid) { 8582 MoveAssignOperator->setInvalidDecl(); 8583 return; 8584 } 8585 8586 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8587 /*isStmtExpr=*/false); 8588 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8589 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8590 8591 if (ASTMutationListener *L = getASTMutationListener()) { 8592 L->CompletedImplicitDefinition(MoveAssignOperator); 8593 } 8594} 8595 8596std::pair<Sema::ImplicitExceptionSpecification, bool> 8597Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8598 if (ClassDecl->isInvalidDecl()) 8599 return std::make_pair(ImplicitExceptionSpecification(Context), false); 8600 8601 // C++ [class.copy]p5: 8602 // The implicitly-declared copy constructor for a class X will 8603 // have the form 8604 // 8605 // X::X(const X&) 8606 // 8607 // if 8608 // FIXME: It ought to be possible to store this on the record. 8609 bool HasConstCopyConstructor = true; 8610 8611 // -- each direct or virtual base class B of X has a copy 8612 // constructor whose first parameter is of type const B& or 8613 // const volatile B&, and 8614 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8615 BaseEnd = ClassDecl->bases_end(); 8616 HasConstCopyConstructor && Base != BaseEnd; 8617 ++Base) { 8618 // Virtual bases are handled below. 8619 if (Base->isVirtual()) 8620 continue; 8621 8622 CXXRecordDecl *BaseClassDecl 8623 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8624 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8625 &HasConstCopyConstructor); 8626 } 8627 8628 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8629 BaseEnd = ClassDecl->vbases_end(); 8630 HasConstCopyConstructor && Base != BaseEnd; 8631 ++Base) { 8632 CXXRecordDecl *BaseClassDecl 8633 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8634 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8635 &HasConstCopyConstructor); 8636 } 8637 8638 // -- for all the nonstatic data members of X that are of a 8639 // class type M (or array thereof), each such class type 8640 // has a copy constructor whose first parameter is of type 8641 // const M& or const volatile M&. 8642 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8643 FieldEnd = ClassDecl->field_end(); 8644 HasConstCopyConstructor && Field != FieldEnd; 8645 ++Field) { 8646 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8647 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8648 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 8649 &HasConstCopyConstructor); 8650 } 8651 } 8652 // Otherwise, the implicitly declared copy constructor will have 8653 // the form 8654 // 8655 // X::X(X&) 8656 8657 // C++ [except.spec]p14: 8658 // An implicitly declared special member function (Clause 12) shall have an 8659 // exception-specification. [...] 8660 ImplicitExceptionSpecification ExceptSpec(Context); 8661 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8662 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8663 BaseEnd = ClassDecl->bases_end(); 8664 Base != BaseEnd; 8665 ++Base) { 8666 // Virtual bases are handled below. 8667 if (Base->isVirtual()) 8668 continue; 8669 8670 CXXRecordDecl *BaseClassDecl 8671 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8672 if (CXXConstructorDecl *CopyConstructor = 8673 LookupCopyingConstructor(BaseClassDecl, Quals)) 8674 ExceptSpec.CalledDecl(CopyConstructor); 8675 } 8676 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8677 BaseEnd = ClassDecl->vbases_end(); 8678 Base != BaseEnd; 8679 ++Base) { 8680 CXXRecordDecl *BaseClassDecl 8681 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8682 if (CXXConstructorDecl *CopyConstructor = 8683 LookupCopyingConstructor(BaseClassDecl, Quals)) 8684 ExceptSpec.CalledDecl(CopyConstructor); 8685 } 8686 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8687 FieldEnd = ClassDecl->field_end(); 8688 Field != FieldEnd; 8689 ++Field) { 8690 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8691 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8692 if (CXXConstructorDecl *CopyConstructor = 8693 LookupCopyingConstructor(FieldClassDecl, Quals)) 8694 ExceptSpec.CalledDecl(CopyConstructor); 8695 } 8696 } 8697 8698 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8699} 8700 8701CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8702 CXXRecordDecl *ClassDecl) { 8703 // C++ [class.copy]p4: 8704 // If the class definition does not explicitly declare a copy 8705 // constructor, one is declared implicitly. 8706 8707 ImplicitExceptionSpecification Spec(Context); 8708 bool Const; 8709 llvm::tie(Spec, Const) = 8710 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8711 8712 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8713 QualType ArgType = ClassType; 8714 if (Const) 8715 ArgType = ArgType.withConst(); 8716 ArgType = Context.getLValueReferenceType(ArgType); 8717 8718 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8719 8720 DeclarationName Name 8721 = Context.DeclarationNames.getCXXConstructorName( 8722 Context.getCanonicalType(ClassType)); 8723 SourceLocation ClassLoc = ClassDecl->getLocation(); 8724 DeclarationNameInfo NameInfo(Name, ClassLoc); 8725 8726 // An implicitly-declared copy constructor is an inline public 8727 // member of its class. 8728 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8729 Context, ClassDecl, ClassLoc, NameInfo, 8730 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8731 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8732 /*isConstexpr=*/ClassDecl->defaultedCopyConstructorIsConstexpr() && 8733 getLangOptions().CPlusPlus0x); 8734 CopyConstructor->setAccess(AS_public); 8735 CopyConstructor->setDefaulted(); 8736 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8737 8738 // Note that we have declared this constructor. 8739 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8740 8741 // Add the parameter to the constructor. 8742 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8743 ClassLoc, ClassLoc, 8744 /*IdentifierInfo=*/0, 8745 ArgType, /*TInfo=*/0, 8746 SC_None, 8747 SC_None, 0); 8748 CopyConstructor->setParams(FromParam); 8749 8750 if (Scope *S = getScopeForContext(ClassDecl)) 8751 PushOnScopeChains(CopyConstructor, S, false); 8752 ClassDecl->addDecl(CopyConstructor); 8753 8754 // C++11 [class.copy]p8: 8755 // ... If the class definition does not explicitly declare a copy 8756 // constructor, there is no user-declared move constructor, and there is no 8757 // user-declared move assignment operator, a copy constructor is implicitly 8758 // declared as defaulted. 8759 if (ClassDecl->hasUserDeclaredMoveConstructor() || 8760 (ClassDecl->hasUserDeclaredMoveAssignment() && 8761 !getLangOptions().MicrosoftExt) || 8762 ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8763 CopyConstructor->setDeletedAsWritten(); 8764 8765 return CopyConstructor; 8766} 8767 8768void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8769 CXXConstructorDecl *CopyConstructor) { 8770 assert((CopyConstructor->isDefaulted() && 8771 CopyConstructor->isCopyConstructor() && 8772 !CopyConstructor->doesThisDeclarationHaveABody()) && 8773 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8774 8775 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8776 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8777 8778 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8779 DiagnosticErrorTrap Trap(Diags); 8780 8781 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8782 Trap.hasErrorOccurred()) { 8783 Diag(CurrentLocation, diag::note_member_synthesized_at) 8784 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8785 CopyConstructor->setInvalidDecl(); 8786 } else { 8787 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8788 CopyConstructor->getLocation(), 8789 MultiStmtArg(*this, 0, 0), 8790 /*isStmtExpr=*/false) 8791 .takeAs<Stmt>()); 8792 CopyConstructor->setImplicitlyDefined(true); 8793 } 8794 8795 CopyConstructor->setUsed(); 8796 if (ASTMutationListener *L = getASTMutationListener()) { 8797 L->CompletedImplicitDefinition(CopyConstructor); 8798 } 8799} 8800 8801Sema::ImplicitExceptionSpecification 8802Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8803 // C++ [except.spec]p14: 8804 // An implicitly declared special member function (Clause 12) shall have an 8805 // exception-specification. [...] 8806 ImplicitExceptionSpecification ExceptSpec(Context); 8807 if (ClassDecl->isInvalidDecl()) 8808 return ExceptSpec; 8809 8810 // Direct base-class constructors. 8811 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8812 BEnd = ClassDecl->bases_end(); 8813 B != BEnd; ++B) { 8814 if (B->isVirtual()) // Handled below. 8815 continue; 8816 8817 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8818 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8819 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8820 // If this is a deleted function, add it anyway. This might be conformant 8821 // with the standard. This might not. I'm not sure. It might not matter. 8822 if (Constructor) 8823 ExceptSpec.CalledDecl(Constructor); 8824 } 8825 } 8826 8827 // Virtual base-class constructors. 8828 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8829 BEnd = ClassDecl->vbases_end(); 8830 B != BEnd; ++B) { 8831 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8832 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8833 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8834 // If this is a deleted function, add it anyway. This might be conformant 8835 // with the standard. This might not. I'm not sure. It might not matter. 8836 if (Constructor) 8837 ExceptSpec.CalledDecl(Constructor); 8838 } 8839 } 8840 8841 // Field constructors. 8842 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8843 FEnd = ClassDecl->field_end(); 8844 F != FEnd; ++F) { 8845 if (const RecordType *RecordTy 8846 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8847 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8848 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8849 // If this is a deleted function, add it anyway. This might be conformant 8850 // with the standard. This might not. I'm not sure. It might not matter. 8851 // In particular, the problem is that this function never gets called. It 8852 // might just be ill-formed because this function attempts to refer to 8853 // a deleted function here. 8854 if (Constructor) 8855 ExceptSpec.CalledDecl(Constructor); 8856 } 8857 } 8858 8859 return ExceptSpec; 8860} 8861 8862CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8863 CXXRecordDecl *ClassDecl) { 8864 ImplicitExceptionSpecification Spec( 8865 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8866 8867 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8868 QualType ArgType = Context.getRValueReferenceType(ClassType); 8869 8870 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8871 8872 DeclarationName Name 8873 = Context.DeclarationNames.getCXXConstructorName( 8874 Context.getCanonicalType(ClassType)); 8875 SourceLocation ClassLoc = ClassDecl->getLocation(); 8876 DeclarationNameInfo NameInfo(Name, ClassLoc); 8877 8878 // C++0x [class.copy]p11: 8879 // An implicitly-declared copy/move constructor is an inline public 8880 // member of its class. 8881 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8882 Context, ClassDecl, ClassLoc, NameInfo, 8883 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8884 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8885 /*isConstexpr=*/ClassDecl->defaultedMoveConstructorIsConstexpr() && 8886 getLangOptions().CPlusPlus0x); 8887 MoveConstructor->setAccess(AS_public); 8888 MoveConstructor->setDefaulted(); 8889 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8890 8891 // Add the parameter to the constructor. 8892 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8893 ClassLoc, ClassLoc, 8894 /*IdentifierInfo=*/0, 8895 ArgType, /*TInfo=*/0, 8896 SC_None, 8897 SC_None, 0); 8898 MoveConstructor->setParams(FromParam); 8899 8900 // C++0x [class.copy]p9: 8901 // If the definition of a class X does not explicitly declare a move 8902 // constructor, one will be implicitly declared as defaulted if and only if: 8903 // [...] 8904 // - the move constructor would not be implicitly defined as deleted. 8905 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8906 // Cache this result so that we don't try to generate this over and over 8907 // on every lookup, leaking memory and wasting time. 8908 ClassDecl->setFailedImplicitMoveConstructor(); 8909 return 0; 8910 } 8911 8912 // Note that we have declared this constructor. 8913 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8914 8915 if (Scope *S = getScopeForContext(ClassDecl)) 8916 PushOnScopeChains(MoveConstructor, S, false); 8917 ClassDecl->addDecl(MoveConstructor); 8918 8919 return MoveConstructor; 8920} 8921 8922void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8923 CXXConstructorDecl *MoveConstructor) { 8924 assert((MoveConstructor->isDefaulted() && 8925 MoveConstructor->isMoveConstructor() && 8926 !MoveConstructor->doesThisDeclarationHaveABody()) && 8927 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8928 8929 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8930 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8931 8932 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8933 DiagnosticErrorTrap Trap(Diags); 8934 8935 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8936 Trap.hasErrorOccurred()) { 8937 Diag(CurrentLocation, diag::note_member_synthesized_at) 8938 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8939 MoveConstructor->setInvalidDecl(); 8940 } else { 8941 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8942 MoveConstructor->getLocation(), 8943 MultiStmtArg(*this, 0, 0), 8944 /*isStmtExpr=*/false) 8945 .takeAs<Stmt>()); 8946 MoveConstructor->setImplicitlyDefined(true); 8947 } 8948 8949 MoveConstructor->setUsed(); 8950 8951 if (ASTMutationListener *L = getASTMutationListener()) { 8952 L->CompletedImplicitDefinition(MoveConstructor); 8953 } 8954} 8955 8956ExprResult 8957Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8958 CXXConstructorDecl *Constructor, 8959 MultiExprArg ExprArgs, 8960 bool HadMultipleCandidates, 8961 bool RequiresZeroInit, 8962 unsigned ConstructKind, 8963 SourceRange ParenRange) { 8964 bool Elidable = false; 8965 8966 // C++0x [class.copy]p34: 8967 // When certain criteria are met, an implementation is allowed to 8968 // omit the copy/move construction of a class object, even if the 8969 // copy/move constructor and/or destructor for the object have 8970 // side effects. [...] 8971 // - when a temporary class object that has not been bound to a 8972 // reference (12.2) would be copied/moved to a class object 8973 // with the same cv-unqualified type, the copy/move operation 8974 // can be omitted by constructing the temporary object 8975 // directly into the target of the omitted copy/move 8976 if (ConstructKind == CXXConstructExpr::CK_Complete && 8977 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 8978 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 8979 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 8980 } 8981 8982 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 8983 Elidable, move(ExprArgs), HadMultipleCandidates, 8984 RequiresZeroInit, ConstructKind, ParenRange); 8985} 8986 8987/// BuildCXXConstructExpr - Creates a complete call to a constructor, 8988/// including handling of its default argument expressions. 8989ExprResult 8990Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8991 CXXConstructorDecl *Constructor, bool Elidable, 8992 MultiExprArg ExprArgs, 8993 bool HadMultipleCandidates, 8994 bool RequiresZeroInit, 8995 unsigned ConstructKind, 8996 SourceRange ParenRange) { 8997 unsigned NumExprs = ExprArgs.size(); 8998 Expr **Exprs = (Expr **)ExprArgs.release(); 8999 9000 for (specific_attr_iterator<NonNullAttr> 9001 i = Constructor->specific_attr_begin<NonNullAttr>(), 9002 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 9003 const NonNullAttr *NonNull = *i; 9004 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 9005 } 9006 9007 MarkDeclarationReferenced(ConstructLoc, Constructor); 9008 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 9009 Constructor, Elidable, Exprs, NumExprs, 9010 HadMultipleCandidates, RequiresZeroInit, 9011 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 9012 ParenRange)); 9013} 9014 9015bool Sema::InitializeVarWithConstructor(VarDecl *VD, 9016 CXXConstructorDecl *Constructor, 9017 MultiExprArg Exprs, 9018 bool HadMultipleCandidates) { 9019 // FIXME: Provide the correct paren SourceRange when available. 9020 ExprResult TempResult = 9021 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 9022 move(Exprs), HadMultipleCandidates, false, 9023 CXXConstructExpr::CK_Complete, SourceRange()); 9024 if (TempResult.isInvalid()) 9025 return true; 9026 9027 Expr *Temp = TempResult.takeAs<Expr>(); 9028 CheckImplicitConversions(Temp, VD->getLocation()); 9029 MarkDeclarationReferenced(VD->getLocation(), Constructor); 9030 Temp = MaybeCreateExprWithCleanups(Temp); 9031 VD->setInit(Temp); 9032 9033 return false; 9034} 9035 9036void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9037 if (VD->isInvalidDecl()) return; 9038 9039 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9040 if (ClassDecl->isInvalidDecl()) return; 9041 if (ClassDecl->hasTrivialDestructor()) return; 9042 if (ClassDecl->isDependentContext()) return; 9043 9044 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9045 MarkDeclarationReferenced(VD->getLocation(), Destructor); 9046 CheckDestructorAccess(VD->getLocation(), Destructor, 9047 PDiag(diag::err_access_dtor_var) 9048 << VD->getDeclName() 9049 << VD->getType()); 9050 9051 if (!VD->hasGlobalStorage()) return; 9052 9053 // Emit warning for non-trivial dtor in global scope (a real global, 9054 // class-static, function-static). 9055 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9056 9057 // TODO: this should be re-enabled for static locals by !CXAAtExit 9058 if (!VD->isStaticLocal()) 9059 Diag(VD->getLocation(), diag::warn_global_destructor); 9060} 9061 9062/// AddCXXDirectInitializerToDecl - This action is called immediately after 9063/// ActOnDeclarator, when a C++ direct initializer is present. 9064/// e.g: "int x(1);" 9065void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 9066 SourceLocation LParenLoc, 9067 MultiExprArg Exprs, 9068 SourceLocation RParenLoc, 9069 bool TypeMayContainAuto) { 9070 // If there is no declaration, there was an error parsing it. Just ignore 9071 // the initializer. 9072 if (RealDecl == 0) 9073 return; 9074 9075 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 9076 if (!VDecl) { 9077 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 9078 RealDecl->setInvalidDecl(); 9079 return; 9080 } 9081 9082 // C++0x [dcl.spec.auto]p6. Deduce the type which 'auto' stands in for. 9083 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 9084 if (Exprs.size() == 0) { 9085 // It isn't possible to write this directly, but it is possible to 9086 // end up in this situation with "auto x(some_pack...);" 9087 Diag(LParenLoc, diag::err_auto_var_init_no_expression) 9088 << VDecl->getDeclName() << VDecl->getType() 9089 << VDecl->getSourceRange(); 9090 RealDecl->setInvalidDecl(); 9091 return; 9092 } 9093 9094 if (Exprs.size() > 1) { 9095 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 9096 diag::err_auto_var_init_multiple_expressions) 9097 << VDecl->getDeclName() << VDecl->getType() 9098 << VDecl->getSourceRange(); 9099 RealDecl->setInvalidDecl(); 9100 return; 9101 } 9102 9103 Expr *Init = Exprs.get()[0]; 9104 TypeSourceInfo *DeducedType = 0; 9105 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 9106 DiagnoseAutoDeductionFailure(VDecl, Init); 9107 if (!DeducedType) { 9108 RealDecl->setInvalidDecl(); 9109 return; 9110 } 9111 VDecl->setTypeSourceInfo(DeducedType); 9112 VDecl->setType(DeducedType->getType()); 9113 9114 // In ARC, infer lifetime. 9115 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 9116 VDecl->setInvalidDecl(); 9117 9118 // If this is a redeclaration, check that the type we just deduced matches 9119 // the previously declared type. 9120 if (VarDecl *Old = VDecl->getPreviousDecl()) 9121 MergeVarDeclTypes(VDecl, Old); 9122 } 9123 9124 // We will represent direct-initialization similarly to copy-initialization: 9125 // int x(1); -as-> int x = 1; 9126 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 9127 // 9128 // Clients that want to distinguish between the two forms, can check for 9129 // direct initializer using VarDecl::hasCXXDirectInitializer(). 9130 // A major benefit is that clients that don't particularly care about which 9131 // exactly form was it (like the CodeGen) can handle both cases without 9132 // special case code. 9133 9134 // C++ 8.5p11: 9135 // The form of initialization (using parentheses or '=') is generally 9136 // insignificant, but does matter when the entity being initialized has a 9137 // class type. 9138 9139 if (!VDecl->getType()->isDependentType() && 9140 !VDecl->getType()->isIncompleteArrayType() && 9141 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 9142 diag::err_typecheck_decl_incomplete_type)) { 9143 VDecl->setInvalidDecl(); 9144 return; 9145 } 9146 9147 // The variable can not have an abstract class type. 9148 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 9149 diag::err_abstract_type_in_decl, 9150 AbstractVariableType)) 9151 VDecl->setInvalidDecl(); 9152 9153 const VarDecl *Def; 9154 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 9155 Diag(VDecl->getLocation(), diag::err_redefinition) 9156 << VDecl->getDeclName(); 9157 Diag(Def->getLocation(), diag::note_previous_definition); 9158 VDecl->setInvalidDecl(); 9159 return; 9160 } 9161 9162 // C++ [class.static.data]p4 9163 // If a static data member is of const integral or const 9164 // enumeration type, its declaration in the class definition can 9165 // specify a constant-initializer which shall be an integral 9166 // constant expression (5.19). In that case, the member can appear 9167 // in integral constant expressions. The member shall still be 9168 // defined in a namespace scope if it is used in the program and the 9169 // namespace scope definition shall not contain an initializer. 9170 // 9171 // We already performed a redefinition check above, but for static 9172 // data members we also need to check whether there was an in-class 9173 // declaration with an initializer. 9174 const VarDecl* PrevInit = 0; 9175 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 9176 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 9177 Diag(PrevInit->getLocation(), diag::note_previous_definition); 9178 return; 9179 } 9180 9181 bool IsDependent = false; 9182 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 9183 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 9184 VDecl->setInvalidDecl(); 9185 return; 9186 } 9187 9188 if (Exprs.get()[I]->isTypeDependent()) 9189 IsDependent = true; 9190 } 9191 9192 // If either the declaration has a dependent type or if any of the 9193 // expressions is type-dependent, we represent the initialization 9194 // via a ParenListExpr for later use during template instantiation. 9195 if (VDecl->getType()->isDependentType() || IsDependent) { 9196 // Let clients know that initialization was done with a direct initializer. 9197 VDecl->setCXXDirectInitializer(true); 9198 9199 // Store the initialization expressions as a ParenListExpr. 9200 unsigned NumExprs = Exprs.size(); 9201 VDecl->setInit(new (Context) ParenListExpr( 9202 Context, LParenLoc, (Expr **)Exprs.release(), NumExprs, RParenLoc, 9203 VDecl->getType().getNonReferenceType())); 9204 return; 9205 } 9206 9207 // Capture the variable that is being initialized and the style of 9208 // initialization. 9209 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 9210 9211 // FIXME: Poor source location information. 9212 InitializationKind Kind 9213 = InitializationKind::CreateDirect(VDecl->getLocation(), 9214 LParenLoc, RParenLoc); 9215 9216 QualType T = VDecl->getType(); 9217 InitializationSequence InitSeq(*this, Entity, Kind, 9218 Exprs.get(), Exprs.size()); 9219 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs), &T); 9220 if (Result.isInvalid()) { 9221 VDecl->setInvalidDecl(); 9222 return; 9223 } else if (T != VDecl->getType()) { 9224 VDecl->setType(T); 9225 Result.get()->setType(T); 9226 } 9227 9228 9229 Expr *Init = Result.get(); 9230 CheckImplicitConversions(Init, LParenLoc); 9231 9232 Init = MaybeCreateExprWithCleanups(Init); 9233 VDecl->setInit(Init); 9234 VDecl->setCXXDirectInitializer(true); 9235 9236 CheckCompleteVariableDeclaration(VDecl); 9237} 9238 9239/// \brief Given a constructor and the set of arguments provided for the 9240/// constructor, convert the arguments and add any required default arguments 9241/// to form a proper call to this constructor. 9242/// 9243/// \returns true if an error occurred, false otherwise. 9244bool 9245Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9246 MultiExprArg ArgsPtr, 9247 SourceLocation Loc, 9248 ASTOwningVector<Expr*> &ConvertedArgs) { 9249 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9250 unsigned NumArgs = ArgsPtr.size(); 9251 Expr **Args = (Expr **)ArgsPtr.get(); 9252 9253 const FunctionProtoType *Proto 9254 = Constructor->getType()->getAs<FunctionProtoType>(); 9255 assert(Proto && "Constructor without a prototype?"); 9256 unsigned NumArgsInProto = Proto->getNumArgs(); 9257 9258 // If too few arguments are available, we'll fill in the rest with defaults. 9259 if (NumArgs < NumArgsInProto) 9260 ConvertedArgs.reserve(NumArgsInProto); 9261 else 9262 ConvertedArgs.reserve(NumArgs); 9263 9264 VariadicCallType CallType = 9265 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9266 SmallVector<Expr *, 8> AllArgs; 9267 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9268 Proto, 0, Args, NumArgs, AllArgs, 9269 CallType); 9270 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 9271 ConvertedArgs.push_back(AllArgs[i]); 9272 return Invalid; 9273} 9274 9275static inline bool 9276CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9277 const FunctionDecl *FnDecl) { 9278 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9279 if (isa<NamespaceDecl>(DC)) { 9280 return SemaRef.Diag(FnDecl->getLocation(), 9281 diag::err_operator_new_delete_declared_in_namespace) 9282 << FnDecl->getDeclName(); 9283 } 9284 9285 if (isa<TranslationUnitDecl>(DC) && 9286 FnDecl->getStorageClass() == SC_Static) { 9287 return SemaRef.Diag(FnDecl->getLocation(), 9288 diag::err_operator_new_delete_declared_static) 9289 << FnDecl->getDeclName(); 9290 } 9291 9292 return false; 9293} 9294 9295static inline bool 9296CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9297 CanQualType ExpectedResultType, 9298 CanQualType ExpectedFirstParamType, 9299 unsigned DependentParamTypeDiag, 9300 unsigned InvalidParamTypeDiag) { 9301 QualType ResultType = 9302 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9303 9304 // Check that the result type is not dependent. 9305 if (ResultType->isDependentType()) 9306 return SemaRef.Diag(FnDecl->getLocation(), 9307 diag::err_operator_new_delete_dependent_result_type) 9308 << FnDecl->getDeclName() << ExpectedResultType; 9309 9310 // Check that the result type is what we expect. 9311 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9312 return SemaRef.Diag(FnDecl->getLocation(), 9313 diag::err_operator_new_delete_invalid_result_type) 9314 << FnDecl->getDeclName() << ExpectedResultType; 9315 9316 // A function template must have at least 2 parameters. 9317 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9318 return SemaRef.Diag(FnDecl->getLocation(), 9319 diag::err_operator_new_delete_template_too_few_parameters) 9320 << FnDecl->getDeclName(); 9321 9322 // The function decl must have at least 1 parameter. 9323 if (FnDecl->getNumParams() == 0) 9324 return SemaRef.Diag(FnDecl->getLocation(), 9325 diag::err_operator_new_delete_too_few_parameters) 9326 << FnDecl->getDeclName(); 9327 9328 // Check the the first parameter type is not dependent. 9329 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9330 if (FirstParamType->isDependentType()) 9331 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9332 << FnDecl->getDeclName() << ExpectedFirstParamType; 9333 9334 // Check that the first parameter type is what we expect. 9335 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9336 ExpectedFirstParamType) 9337 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9338 << FnDecl->getDeclName() << ExpectedFirstParamType; 9339 9340 return false; 9341} 9342 9343static bool 9344CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9345 // C++ [basic.stc.dynamic.allocation]p1: 9346 // A program is ill-formed if an allocation function is declared in a 9347 // namespace scope other than global scope or declared static in global 9348 // scope. 9349 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9350 return true; 9351 9352 CanQualType SizeTy = 9353 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9354 9355 // C++ [basic.stc.dynamic.allocation]p1: 9356 // The return type shall be void*. The first parameter shall have type 9357 // std::size_t. 9358 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9359 SizeTy, 9360 diag::err_operator_new_dependent_param_type, 9361 diag::err_operator_new_param_type)) 9362 return true; 9363 9364 // C++ [basic.stc.dynamic.allocation]p1: 9365 // The first parameter shall not have an associated default argument. 9366 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9367 return SemaRef.Diag(FnDecl->getLocation(), 9368 diag::err_operator_new_default_arg) 9369 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9370 9371 return false; 9372} 9373 9374static bool 9375CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9376 // C++ [basic.stc.dynamic.deallocation]p1: 9377 // A program is ill-formed if deallocation functions are declared in a 9378 // namespace scope other than global scope or declared static in global 9379 // scope. 9380 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9381 return true; 9382 9383 // C++ [basic.stc.dynamic.deallocation]p2: 9384 // Each deallocation function shall return void and its first parameter 9385 // shall be void*. 9386 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9387 SemaRef.Context.VoidPtrTy, 9388 diag::err_operator_delete_dependent_param_type, 9389 diag::err_operator_delete_param_type)) 9390 return true; 9391 9392 return false; 9393} 9394 9395/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9396/// of this overloaded operator is well-formed. If so, returns false; 9397/// otherwise, emits appropriate diagnostics and returns true. 9398bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9399 assert(FnDecl && FnDecl->isOverloadedOperator() && 9400 "Expected an overloaded operator declaration"); 9401 9402 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9403 9404 // C++ [over.oper]p5: 9405 // The allocation and deallocation functions, operator new, 9406 // operator new[], operator delete and operator delete[], are 9407 // described completely in 3.7.3. The attributes and restrictions 9408 // found in the rest of this subclause do not apply to them unless 9409 // explicitly stated in 3.7.3. 9410 if (Op == OO_Delete || Op == OO_Array_Delete) 9411 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9412 9413 if (Op == OO_New || Op == OO_Array_New) 9414 return CheckOperatorNewDeclaration(*this, FnDecl); 9415 9416 // C++ [over.oper]p6: 9417 // An operator function shall either be a non-static member 9418 // function or be a non-member function and have at least one 9419 // parameter whose type is a class, a reference to a class, an 9420 // enumeration, or a reference to an enumeration. 9421 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9422 if (MethodDecl->isStatic()) 9423 return Diag(FnDecl->getLocation(), 9424 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9425 } else { 9426 bool ClassOrEnumParam = false; 9427 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9428 ParamEnd = FnDecl->param_end(); 9429 Param != ParamEnd; ++Param) { 9430 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9431 if (ParamType->isDependentType() || ParamType->isRecordType() || 9432 ParamType->isEnumeralType()) { 9433 ClassOrEnumParam = true; 9434 break; 9435 } 9436 } 9437 9438 if (!ClassOrEnumParam) 9439 return Diag(FnDecl->getLocation(), 9440 diag::err_operator_overload_needs_class_or_enum) 9441 << FnDecl->getDeclName(); 9442 } 9443 9444 // C++ [over.oper]p8: 9445 // An operator function cannot have default arguments (8.3.6), 9446 // except where explicitly stated below. 9447 // 9448 // Only the function-call operator allows default arguments 9449 // (C++ [over.call]p1). 9450 if (Op != OO_Call) { 9451 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9452 Param != FnDecl->param_end(); ++Param) { 9453 if ((*Param)->hasDefaultArg()) 9454 return Diag((*Param)->getLocation(), 9455 diag::err_operator_overload_default_arg) 9456 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9457 } 9458 } 9459 9460 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9461 { false, false, false } 9462#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9463 , { Unary, Binary, MemberOnly } 9464#include "clang/Basic/OperatorKinds.def" 9465 }; 9466 9467 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9468 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9469 bool MustBeMemberOperator = OperatorUses[Op][2]; 9470 9471 // C++ [over.oper]p8: 9472 // [...] Operator functions cannot have more or fewer parameters 9473 // than the number required for the corresponding operator, as 9474 // described in the rest of this subclause. 9475 unsigned NumParams = FnDecl->getNumParams() 9476 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9477 if (Op != OO_Call && 9478 ((NumParams == 1 && !CanBeUnaryOperator) || 9479 (NumParams == 2 && !CanBeBinaryOperator) || 9480 (NumParams < 1) || (NumParams > 2))) { 9481 // We have the wrong number of parameters. 9482 unsigned ErrorKind; 9483 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9484 ErrorKind = 2; // 2 -> unary or binary. 9485 } else if (CanBeUnaryOperator) { 9486 ErrorKind = 0; // 0 -> unary 9487 } else { 9488 assert(CanBeBinaryOperator && 9489 "All non-call overloaded operators are unary or binary!"); 9490 ErrorKind = 1; // 1 -> binary 9491 } 9492 9493 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9494 << FnDecl->getDeclName() << NumParams << ErrorKind; 9495 } 9496 9497 // Overloaded operators other than operator() cannot be variadic. 9498 if (Op != OO_Call && 9499 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9500 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9501 << FnDecl->getDeclName(); 9502 } 9503 9504 // Some operators must be non-static member functions. 9505 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9506 return Diag(FnDecl->getLocation(), 9507 diag::err_operator_overload_must_be_member) 9508 << FnDecl->getDeclName(); 9509 } 9510 9511 // C++ [over.inc]p1: 9512 // The user-defined function called operator++ implements the 9513 // prefix and postfix ++ operator. If this function is a member 9514 // function with no parameters, or a non-member function with one 9515 // parameter of class or enumeration type, it defines the prefix 9516 // increment operator ++ for objects of that type. If the function 9517 // is a member function with one parameter (which shall be of type 9518 // int) or a non-member function with two parameters (the second 9519 // of which shall be of type int), it defines the postfix 9520 // increment operator ++ for objects of that type. 9521 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9522 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9523 bool ParamIsInt = false; 9524 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9525 ParamIsInt = BT->getKind() == BuiltinType::Int; 9526 9527 if (!ParamIsInt) 9528 return Diag(LastParam->getLocation(), 9529 diag::err_operator_overload_post_incdec_must_be_int) 9530 << LastParam->getType() << (Op == OO_MinusMinus); 9531 } 9532 9533 return false; 9534} 9535 9536/// CheckLiteralOperatorDeclaration - Check whether the declaration 9537/// of this literal operator function is well-formed. If so, returns 9538/// false; otherwise, emits appropriate diagnostics and returns true. 9539bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9540 DeclContext *DC = FnDecl->getDeclContext(); 9541 Decl::Kind Kind = DC->getDeclKind(); 9542 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 9543 Kind != Decl::LinkageSpec) { 9544 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9545 << FnDecl->getDeclName(); 9546 return true; 9547 } 9548 9549 bool Valid = false; 9550 9551 // template <char...> type operator "" name() is the only valid template 9552 // signature, and the only valid signature with no parameters. 9553 if (FnDecl->param_size() == 0) { 9554 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 9555 // Must have only one template parameter 9556 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9557 if (Params->size() == 1) { 9558 NonTypeTemplateParmDecl *PmDecl = 9559 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9560 9561 // The template parameter must be a char parameter pack. 9562 if (PmDecl && PmDecl->isTemplateParameterPack() && 9563 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9564 Valid = true; 9565 } 9566 } 9567 } else { 9568 // Check the first parameter 9569 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9570 9571 QualType T = (*Param)->getType(); 9572 9573 // unsigned long long int, long double, and any character type are allowed 9574 // as the only parameters. 9575 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9576 Context.hasSameType(T, Context.LongDoubleTy) || 9577 Context.hasSameType(T, Context.CharTy) || 9578 Context.hasSameType(T, Context.WCharTy) || 9579 Context.hasSameType(T, Context.Char16Ty) || 9580 Context.hasSameType(T, Context.Char32Ty)) { 9581 if (++Param == FnDecl->param_end()) 9582 Valid = true; 9583 goto FinishedParams; 9584 } 9585 9586 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9587 const PointerType *PT = T->getAs<PointerType>(); 9588 if (!PT) 9589 goto FinishedParams; 9590 T = PT->getPointeeType(); 9591 if (!T.isConstQualified()) 9592 goto FinishedParams; 9593 T = T.getUnqualifiedType(); 9594 9595 // Move on to the second parameter; 9596 ++Param; 9597 9598 // If there is no second parameter, the first must be a const char * 9599 if (Param == FnDecl->param_end()) { 9600 if (Context.hasSameType(T, Context.CharTy)) 9601 Valid = true; 9602 goto FinishedParams; 9603 } 9604 9605 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9606 // are allowed as the first parameter to a two-parameter function 9607 if (!(Context.hasSameType(T, Context.CharTy) || 9608 Context.hasSameType(T, Context.WCharTy) || 9609 Context.hasSameType(T, Context.Char16Ty) || 9610 Context.hasSameType(T, Context.Char32Ty))) 9611 goto FinishedParams; 9612 9613 // The second and final parameter must be an std::size_t 9614 T = (*Param)->getType().getUnqualifiedType(); 9615 if (Context.hasSameType(T, Context.getSizeType()) && 9616 ++Param == FnDecl->param_end()) 9617 Valid = true; 9618 } 9619 9620 // FIXME: This diagnostic is absolutely terrible. 9621FinishedParams: 9622 if (!Valid) { 9623 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9624 << FnDecl->getDeclName(); 9625 return true; 9626 } 9627 9628 StringRef LiteralName 9629 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9630 if (LiteralName[0] != '_') { 9631 // C++0x [usrlit.suffix]p1: 9632 // Literal suffix identifiers that do not start with an underscore are 9633 // reserved for future standardization. 9634 bool IsHexFloat = true; 9635 if (LiteralName.size() > 1 && 9636 (LiteralName[0] == 'P' || LiteralName[0] == 'p')) { 9637 for (unsigned I = 1, N = LiteralName.size(); I < N; ++I) { 9638 if (!isdigit(LiteralName[I])) { 9639 IsHexFloat = false; 9640 break; 9641 } 9642 } 9643 } 9644 9645 if (IsHexFloat) 9646 Diag(FnDecl->getLocation(), diag::warn_user_literal_hexfloat) 9647 << LiteralName; 9648 else 9649 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9650 } 9651 9652 return false; 9653} 9654 9655/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9656/// linkage specification, including the language and (if present) 9657/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9658/// the location of the language string literal, which is provided 9659/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9660/// the '{' brace. Otherwise, this linkage specification does not 9661/// have any braces. 9662Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9663 SourceLocation LangLoc, 9664 StringRef Lang, 9665 SourceLocation LBraceLoc) { 9666 LinkageSpecDecl::LanguageIDs Language; 9667 if (Lang == "\"C\"") 9668 Language = LinkageSpecDecl::lang_c; 9669 else if (Lang == "\"C++\"") 9670 Language = LinkageSpecDecl::lang_cxx; 9671 else { 9672 Diag(LangLoc, diag::err_bad_language); 9673 return 0; 9674 } 9675 9676 // FIXME: Add all the various semantics of linkage specifications 9677 9678 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9679 ExternLoc, LangLoc, Language); 9680 CurContext->addDecl(D); 9681 PushDeclContext(S, D); 9682 return D; 9683} 9684 9685/// ActOnFinishLinkageSpecification - Complete the definition of 9686/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9687/// valid, it's the position of the closing '}' brace in a linkage 9688/// specification that uses braces. 9689Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9690 Decl *LinkageSpec, 9691 SourceLocation RBraceLoc) { 9692 if (LinkageSpec) { 9693 if (RBraceLoc.isValid()) { 9694 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9695 LSDecl->setRBraceLoc(RBraceLoc); 9696 } 9697 PopDeclContext(); 9698 } 9699 return LinkageSpec; 9700} 9701 9702/// \brief Perform semantic analysis for the variable declaration that 9703/// occurs within a C++ catch clause, returning the newly-created 9704/// variable. 9705VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9706 TypeSourceInfo *TInfo, 9707 SourceLocation StartLoc, 9708 SourceLocation Loc, 9709 IdentifierInfo *Name) { 9710 bool Invalid = false; 9711 QualType ExDeclType = TInfo->getType(); 9712 9713 // Arrays and functions decay. 9714 if (ExDeclType->isArrayType()) 9715 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9716 else if (ExDeclType->isFunctionType()) 9717 ExDeclType = Context.getPointerType(ExDeclType); 9718 9719 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9720 // The exception-declaration shall not denote a pointer or reference to an 9721 // incomplete type, other than [cv] void*. 9722 // N2844 forbids rvalue references. 9723 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9724 Diag(Loc, diag::err_catch_rvalue_ref); 9725 Invalid = true; 9726 } 9727 9728 // GCC allows catching pointers and references to incomplete types 9729 // as an extension; so do we, but we warn by default. 9730 9731 QualType BaseType = ExDeclType; 9732 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9733 unsigned DK = diag::err_catch_incomplete; 9734 bool IncompleteCatchIsInvalid = true; 9735 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9736 BaseType = Ptr->getPointeeType(); 9737 Mode = 1; 9738 DK = diag::ext_catch_incomplete_ptr; 9739 IncompleteCatchIsInvalid = false; 9740 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9741 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9742 BaseType = Ref->getPointeeType(); 9743 Mode = 2; 9744 DK = diag::ext_catch_incomplete_ref; 9745 IncompleteCatchIsInvalid = false; 9746 } 9747 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9748 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 9749 IncompleteCatchIsInvalid) 9750 Invalid = true; 9751 9752 if (!Invalid && !ExDeclType->isDependentType() && 9753 RequireNonAbstractType(Loc, ExDeclType, 9754 diag::err_abstract_type_in_decl, 9755 AbstractVariableType)) 9756 Invalid = true; 9757 9758 // Only the non-fragile NeXT runtime currently supports C++ catches 9759 // of ObjC types, and no runtime supports catching ObjC types by value. 9760 if (!Invalid && getLangOptions().ObjC1) { 9761 QualType T = ExDeclType; 9762 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9763 T = RT->getPointeeType(); 9764 9765 if (T->isObjCObjectType()) { 9766 Diag(Loc, diag::err_objc_object_catch); 9767 Invalid = true; 9768 } else if (T->isObjCObjectPointerType()) { 9769 if (!getLangOptions().ObjCNonFragileABI) 9770 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9771 } 9772 } 9773 9774 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9775 ExDeclType, TInfo, SC_None, SC_None); 9776 ExDecl->setExceptionVariable(true); 9777 9778 // In ARC, infer 'retaining' for variables of retainable type. 9779 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9780 Invalid = true; 9781 9782 if (!Invalid && !ExDeclType->isDependentType()) { 9783 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9784 // C++ [except.handle]p16: 9785 // The object declared in an exception-declaration or, if the 9786 // exception-declaration does not specify a name, a temporary (12.2) is 9787 // copy-initialized (8.5) from the exception object. [...] 9788 // The object is destroyed when the handler exits, after the destruction 9789 // of any automatic objects initialized within the handler. 9790 // 9791 // We just pretend to initialize the object with itself, then make sure 9792 // it can be destroyed later. 9793 QualType initType = ExDeclType; 9794 9795 InitializedEntity entity = 9796 InitializedEntity::InitializeVariable(ExDecl); 9797 InitializationKind initKind = 9798 InitializationKind::CreateCopy(Loc, SourceLocation()); 9799 9800 Expr *opaqueValue = 9801 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9802 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9803 ExprResult result = sequence.Perform(*this, entity, initKind, 9804 MultiExprArg(&opaqueValue, 1)); 9805 if (result.isInvalid()) 9806 Invalid = true; 9807 else { 9808 // If the constructor used was non-trivial, set this as the 9809 // "initializer". 9810 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9811 if (!construct->getConstructor()->isTrivial()) { 9812 Expr *init = MaybeCreateExprWithCleanups(construct); 9813 ExDecl->setInit(init); 9814 } 9815 9816 // And make sure it's destructable. 9817 FinalizeVarWithDestructor(ExDecl, recordType); 9818 } 9819 } 9820 } 9821 9822 if (Invalid) 9823 ExDecl->setInvalidDecl(); 9824 9825 return ExDecl; 9826} 9827 9828/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9829/// handler. 9830Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9831 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9832 bool Invalid = D.isInvalidType(); 9833 9834 // Check for unexpanded parameter packs. 9835 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9836 UPPC_ExceptionType)) { 9837 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9838 D.getIdentifierLoc()); 9839 Invalid = true; 9840 } 9841 9842 IdentifierInfo *II = D.getIdentifier(); 9843 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9844 LookupOrdinaryName, 9845 ForRedeclaration)) { 9846 // The scope should be freshly made just for us. There is just no way 9847 // it contains any previous declaration. 9848 assert(!S->isDeclScope(PrevDecl)); 9849 if (PrevDecl->isTemplateParameter()) { 9850 // Maybe we will complain about the shadowed template parameter. 9851 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9852 PrevDecl = 0; 9853 } 9854 } 9855 9856 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9857 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9858 << D.getCXXScopeSpec().getRange(); 9859 Invalid = true; 9860 } 9861 9862 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9863 D.getSourceRange().getBegin(), 9864 D.getIdentifierLoc(), 9865 D.getIdentifier()); 9866 if (Invalid) 9867 ExDecl->setInvalidDecl(); 9868 9869 // Add the exception declaration into this scope. 9870 if (II) 9871 PushOnScopeChains(ExDecl, S); 9872 else 9873 CurContext->addDecl(ExDecl); 9874 9875 ProcessDeclAttributes(S, ExDecl, D); 9876 return ExDecl; 9877} 9878 9879Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9880 Expr *AssertExpr, 9881 Expr *AssertMessageExpr_, 9882 SourceLocation RParenLoc) { 9883 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9884 9885 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9886 llvm::APSInt Cond; 9887 if (VerifyIntegerConstantExpression(AssertExpr, &Cond, 9888 diag::err_static_assert_expression_is_not_constant, 9889 /*AllowFold=*/false)) 9890 return 0; 9891 9892 if (!Cond) 9893 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9894 << AssertMessage->getString() << AssertExpr->getSourceRange(); 9895 } 9896 9897 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9898 return 0; 9899 9900 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9901 AssertExpr, AssertMessage, RParenLoc); 9902 9903 CurContext->addDecl(Decl); 9904 return Decl; 9905} 9906 9907/// \brief Perform semantic analysis of the given friend type declaration. 9908/// 9909/// \returns A friend declaration that. 9910FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc, 9911 SourceLocation FriendLoc, 9912 TypeSourceInfo *TSInfo) { 9913 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9914 9915 QualType T = TSInfo->getType(); 9916 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9917 9918 // C++03 [class.friend]p2: 9919 // An elaborated-type-specifier shall be used in a friend declaration 9920 // for a class.* 9921 // 9922 // * The class-key of the elaborated-type-specifier is required. 9923 if (!ActiveTemplateInstantiations.empty()) { 9924 // Do not complain about the form of friend template types during 9925 // template instantiation; we will already have complained when the 9926 // template was declared. 9927 } else if (!T->isElaboratedTypeSpecifier()) { 9928 // If we evaluated the type to a record type, suggest putting 9929 // a tag in front. 9930 if (const RecordType *RT = T->getAs<RecordType>()) { 9931 RecordDecl *RD = RT->getDecl(); 9932 9933 std::string InsertionText = std::string(" ") + RD->getKindName(); 9934 9935 Diag(TypeRange.getBegin(), 9936 getLangOptions().CPlusPlus0x ? 9937 diag::warn_cxx98_compat_unelaborated_friend_type : 9938 diag::ext_unelaborated_friend_type) 9939 << (unsigned) RD->getTagKind() 9940 << T 9941 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9942 InsertionText); 9943 } else { 9944 Diag(FriendLoc, 9945 getLangOptions().CPlusPlus0x ? 9946 diag::warn_cxx98_compat_nonclass_type_friend : 9947 diag::ext_nonclass_type_friend) 9948 << T 9949 << SourceRange(FriendLoc, TypeRange.getEnd()); 9950 } 9951 } else if (T->getAs<EnumType>()) { 9952 Diag(FriendLoc, 9953 getLangOptions().CPlusPlus0x ? 9954 diag::warn_cxx98_compat_enum_friend : 9955 diag::ext_enum_friend) 9956 << T 9957 << SourceRange(FriendLoc, TypeRange.getEnd()); 9958 } 9959 9960 // C++0x [class.friend]p3: 9961 // If the type specifier in a friend declaration designates a (possibly 9962 // cv-qualified) class type, that class is declared as a friend; otherwise, 9963 // the friend declaration is ignored. 9964 9965 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9966 // in [class.friend]p3 that we do not implement. 9967 9968 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc); 9969} 9970 9971/// Handle a friend tag declaration where the scope specifier was 9972/// templated. 9973Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9974 unsigned TagSpec, SourceLocation TagLoc, 9975 CXXScopeSpec &SS, 9976 IdentifierInfo *Name, SourceLocation NameLoc, 9977 AttributeList *Attr, 9978 MultiTemplateParamsArg TempParamLists) { 9979 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9980 9981 bool isExplicitSpecialization = false; 9982 bool Invalid = false; 9983 9984 if (TemplateParameterList *TemplateParams 9985 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9986 TempParamLists.get(), 9987 TempParamLists.size(), 9988 /*friend*/ true, 9989 isExplicitSpecialization, 9990 Invalid)) { 9991 if (TemplateParams->size() > 0) { 9992 // This is a declaration of a class template. 9993 if (Invalid) 9994 return 0; 9995 9996 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9997 SS, Name, NameLoc, Attr, 9998 TemplateParams, AS_public, 9999 /*ModulePrivateLoc=*/SourceLocation(), 10000 TempParamLists.size() - 1, 10001 (TemplateParameterList**) TempParamLists.release()).take(); 10002 } else { 10003 // The "template<>" header is extraneous. 10004 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 10005 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 10006 isExplicitSpecialization = true; 10007 } 10008 } 10009 10010 if (Invalid) return 0; 10011 10012 bool isAllExplicitSpecializations = true; 10013 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 10014 if (TempParamLists.get()[I]->size()) { 10015 isAllExplicitSpecializations = false; 10016 break; 10017 } 10018 } 10019 10020 // FIXME: don't ignore attributes. 10021 10022 // If it's explicit specializations all the way down, just forget 10023 // about the template header and build an appropriate non-templated 10024 // friend. TODO: for source fidelity, remember the headers. 10025 if (isAllExplicitSpecializations) { 10026 if (SS.isEmpty()) { 10027 bool Owned = false; 10028 bool IsDependent = false; 10029 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 10030 Attr, AS_public, 10031 /*ModulePrivateLoc=*/SourceLocation(), 10032 MultiTemplateParamsArg(), Owned, IsDependent, 10033 /*ScopedEnumKWLoc=*/SourceLocation(), 10034 /*ScopedEnumUsesClassTag=*/false, 10035 /*UnderlyingType=*/TypeResult()); 10036 } 10037 10038 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 10039 ElaboratedTypeKeyword Keyword 10040 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10041 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 10042 *Name, NameLoc); 10043 if (T.isNull()) 10044 return 0; 10045 10046 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10047 if (isa<DependentNameType>(T)) { 10048 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10049 TL.setKeywordLoc(TagLoc); 10050 TL.setQualifierLoc(QualifierLoc); 10051 TL.setNameLoc(NameLoc); 10052 } else { 10053 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 10054 TL.setKeywordLoc(TagLoc); 10055 TL.setQualifierLoc(QualifierLoc); 10056 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 10057 } 10058 10059 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10060 TSI, FriendLoc); 10061 Friend->setAccess(AS_public); 10062 CurContext->addDecl(Friend); 10063 return Friend; 10064 } 10065 10066 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 10067 10068 10069 10070 // Handle the case of a templated-scope friend class. e.g. 10071 // template <class T> class A<T>::B; 10072 // FIXME: we don't support these right now. 10073 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10074 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 10075 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10076 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10077 TL.setKeywordLoc(TagLoc); 10078 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 10079 TL.setNameLoc(NameLoc); 10080 10081 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10082 TSI, FriendLoc); 10083 Friend->setAccess(AS_public); 10084 Friend->setUnsupportedFriend(true); 10085 CurContext->addDecl(Friend); 10086 return Friend; 10087} 10088 10089 10090/// Handle a friend type declaration. This works in tandem with 10091/// ActOnTag. 10092/// 10093/// Notes on friend class templates: 10094/// 10095/// We generally treat friend class declarations as if they were 10096/// declaring a class. So, for example, the elaborated type specifier 10097/// in a friend declaration is required to obey the restrictions of a 10098/// class-head (i.e. no typedefs in the scope chain), template 10099/// parameters are required to match up with simple template-ids, &c. 10100/// However, unlike when declaring a template specialization, it's 10101/// okay to refer to a template specialization without an empty 10102/// template parameter declaration, e.g. 10103/// friend class A<T>::B<unsigned>; 10104/// We permit this as a special case; if there are any template 10105/// parameters present at all, require proper matching, i.e. 10106/// template <> template <class T> friend class A<int>::B; 10107Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 10108 MultiTemplateParamsArg TempParams) { 10109 SourceLocation Loc = DS.getSourceRange().getBegin(); 10110 10111 assert(DS.isFriendSpecified()); 10112 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10113 10114 // Try to convert the decl specifier to a type. This works for 10115 // friend templates because ActOnTag never produces a ClassTemplateDecl 10116 // for a TUK_Friend. 10117 Declarator TheDeclarator(DS, Declarator::MemberContext); 10118 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 10119 QualType T = TSI->getType(); 10120 if (TheDeclarator.isInvalidType()) 10121 return 0; 10122 10123 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 10124 return 0; 10125 10126 // This is definitely an error in C++98. It's probably meant to 10127 // be forbidden in C++0x, too, but the specification is just 10128 // poorly written. 10129 // 10130 // The problem is with declarations like the following: 10131 // template <T> friend A<T>::foo; 10132 // where deciding whether a class C is a friend or not now hinges 10133 // on whether there exists an instantiation of A that causes 10134 // 'foo' to equal C. There are restrictions on class-heads 10135 // (which we declare (by fiat) elaborated friend declarations to 10136 // be) that makes this tractable. 10137 // 10138 // FIXME: handle "template <> friend class A<T>;", which 10139 // is possibly well-formed? Who even knows? 10140 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 10141 Diag(Loc, diag::err_tagless_friend_type_template) 10142 << DS.getSourceRange(); 10143 return 0; 10144 } 10145 10146 // C++98 [class.friend]p1: A friend of a class is a function 10147 // or class that is not a member of the class . . . 10148 // This is fixed in DR77, which just barely didn't make the C++03 10149 // deadline. It's also a very silly restriction that seriously 10150 // affects inner classes and which nobody else seems to implement; 10151 // thus we never diagnose it, not even in -pedantic. 10152 // 10153 // But note that we could warn about it: it's always useless to 10154 // friend one of your own members (it's not, however, worthless to 10155 // friend a member of an arbitrary specialization of your template). 10156 10157 Decl *D; 10158 if (unsigned NumTempParamLists = TempParams.size()) 10159 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10160 NumTempParamLists, 10161 TempParams.release(), 10162 TSI, 10163 DS.getFriendSpecLoc()); 10164 else 10165 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 10166 10167 if (!D) 10168 return 0; 10169 10170 D->setAccess(AS_public); 10171 CurContext->addDecl(D); 10172 10173 return D; 10174} 10175 10176Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 10177 MultiTemplateParamsArg TemplateParams) { 10178 const DeclSpec &DS = D.getDeclSpec(); 10179 10180 assert(DS.isFriendSpecified()); 10181 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10182 10183 SourceLocation Loc = D.getIdentifierLoc(); 10184 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10185 10186 // C++ [class.friend]p1 10187 // A friend of a class is a function or class.... 10188 // Note that this sees through typedefs, which is intended. 10189 // It *doesn't* see through dependent types, which is correct 10190 // according to [temp.arg.type]p3: 10191 // If a declaration acquires a function type through a 10192 // type dependent on a template-parameter and this causes 10193 // a declaration that does not use the syntactic form of a 10194 // function declarator to have a function type, the program 10195 // is ill-formed. 10196 if (!TInfo->getType()->isFunctionType()) { 10197 Diag(Loc, diag::err_unexpected_friend); 10198 10199 // It might be worthwhile to try to recover by creating an 10200 // appropriate declaration. 10201 return 0; 10202 } 10203 10204 // C++ [namespace.memdef]p3 10205 // - If a friend declaration in a non-local class first declares a 10206 // class or function, the friend class or function is a member 10207 // of the innermost enclosing namespace. 10208 // - The name of the friend is not found by simple name lookup 10209 // until a matching declaration is provided in that namespace 10210 // scope (either before or after the class declaration granting 10211 // friendship). 10212 // - If a friend function is called, its name may be found by the 10213 // name lookup that considers functions from namespaces and 10214 // classes associated with the types of the function arguments. 10215 // - When looking for a prior declaration of a class or a function 10216 // declared as a friend, scopes outside the innermost enclosing 10217 // namespace scope are not considered. 10218 10219 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10220 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10221 DeclarationName Name = NameInfo.getName(); 10222 assert(Name); 10223 10224 // Check for unexpanded parameter packs. 10225 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10226 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10227 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10228 return 0; 10229 10230 // The context we found the declaration in, or in which we should 10231 // create the declaration. 10232 DeclContext *DC; 10233 Scope *DCScope = S; 10234 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10235 ForRedeclaration); 10236 10237 // FIXME: there are different rules in local classes 10238 10239 // There are four cases here. 10240 // - There's no scope specifier, in which case we just go to the 10241 // appropriate scope and look for a function or function template 10242 // there as appropriate. 10243 // Recover from invalid scope qualifiers as if they just weren't there. 10244 if (SS.isInvalid() || !SS.isSet()) { 10245 // C++0x [namespace.memdef]p3: 10246 // If the name in a friend declaration is neither qualified nor 10247 // a template-id and the declaration is a function or an 10248 // elaborated-type-specifier, the lookup to determine whether 10249 // the entity has been previously declared shall not consider 10250 // any scopes outside the innermost enclosing namespace. 10251 // C++0x [class.friend]p11: 10252 // If a friend declaration appears in a local class and the name 10253 // specified is an unqualified name, a prior declaration is 10254 // looked up without considering scopes that are outside the 10255 // innermost enclosing non-class scope. For a friend function 10256 // declaration, if there is no prior declaration, the program is 10257 // ill-formed. 10258 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10259 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10260 10261 // Find the appropriate context according to the above. 10262 DC = CurContext; 10263 while (true) { 10264 // Skip class contexts. If someone can cite chapter and verse 10265 // for this behavior, that would be nice --- it's what GCC and 10266 // EDG do, and it seems like a reasonable intent, but the spec 10267 // really only says that checks for unqualified existing 10268 // declarations should stop at the nearest enclosing namespace, 10269 // not that they should only consider the nearest enclosing 10270 // namespace. 10271 while (DC->isRecord()) 10272 DC = DC->getParent(); 10273 10274 LookupQualifiedName(Previous, DC); 10275 10276 // TODO: decide what we think about using declarations. 10277 if (isLocal || !Previous.empty()) 10278 break; 10279 10280 if (isTemplateId) { 10281 if (isa<TranslationUnitDecl>(DC)) break; 10282 } else { 10283 if (DC->isFileContext()) break; 10284 } 10285 DC = DC->getParent(); 10286 } 10287 10288 // C++ [class.friend]p1: A friend of a class is a function or 10289 // class that is not a member of the class . . . 10290 // C++11 changes this for both friend types and functions. 10291 // Most C++ 98 compilers do seem to give an error here, so 10292 // we do, too. 10293 if (!Previous.empty() && DC->Equals(CurContext)) 10294 Diag(DS.getFriendSpecLoc(), 10295 getLangOptions().CPlusPlus0x ? 10296 diag::warn_cxx98_compat_friend_is_member : 10297 diag::err_friend_is_member); 10298 10299 DCScope = getScopeForDeclContext(S, DC); 10300 10301 // C++ [class.friend]p6: 10302 // A function can be defined in a friend declaration of a class if and 10303 // only if the class is a non-local class (9.8), the function name is 10304 // unqualified, and the function has namespace scope. 10305 if (isLocal && D.isFunctionDefinition()) { 10306 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10307 } 10308 10309 // - There's a non-dependent scope specifier, in which case we 10310 // compute it and do a previous lookup there for a function 10311 // or function template. 10312 } else if (!SS.getScopeRep()->isDependent()) { 10313 DC = computeDeclContext(SS); 10314 if (!DC) return 0; 10315 10316 if (RequireCompleteDeclContext(SS, DC)) return 0; 10317 10318 LookupQualifiedName(Previous, DC); 10319 10320 // Ignore things found implicitly in the wrong scope. 10321 // TODO: better diagnostics for this case. Suggesting the right 10322 // qualified scope would be nice... 10323 LookupResult::Filter F = Previous.makeFilter(); 10324 while (F.hasNext()) { 10325 NamedDecl *D = F.next(); 10326 if (!DC->InEnclosingNamespaceSetOf( 10327 D->getDeclContext()->getRedeclContext())) 10328 F.erase(); 10329 } 10330 F.done(); 10331 10332 if (Previous.empty()) { 10333 D.setInvalidType(); 10334 Diag(Loc, diag::err_qualified_friend_not_found) 10335 << Name << TInfo->getType(); 10336 return 0; 10337 } 10338 10339 // C++ [class.friend]p1: A friend of a class is a function or 10340 // class that is not a member of the class . . . 10341 if (DC->Equals(CurContext)) 10342 Diag(DS.getFriendSpecLoc(), 10343 getLangOptions().CPlusPlus0x ? 10344 diag::warn_cxx98_compat_friend_is_member : 10345 diag::err_friend_is_member); 10346 10347 if (D.isFunctionDefinition()) { 10348 // C++ [class.friend]p6: 10349 // A function can be defined in a friend declaration of a class if and 10350 // only if the class is a non-local class (9.8), the function name is 10351 // unqualified, and the function has namespace scope. 10352 SemaDiagnosticBuilder DB 10353 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10354 10355 DB << SS.getScopeRep(); 10356 if (DC->isFileContext()) 10357 DB << FixItHint::CreateRemoval(SS.getRange()); 10358 SS.clear(); 10359 } 10360 10361 // - There's a scope specifier that does not match any template 10362 // parameter lists, in which case we use some arbitrary context, 10363 // create a method or method template, and wait for instantiation. 10364 // - There's a scope specifier that does match some template 10365 // parameter lists, which we don't handle right now. 10366 } else { 10367 if (D.isFunctionDefinition()) { 10368 // C++ [class.friend]p6: 10369 // A function can be defined in a friend declaration of a class if and 10370 // only if the class is a non-local class (9.8), the function name is 10371 // unqualified, and the function has namespace scope. 10372 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10373 << SS.getScopeRep(); 10374 } 10375 10376 DC = CurContext; 10377 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10378 } 10379 10380 if (!DC->isRecord()) { 10381 // This implies that it has to be an operator or function. 10382 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10383 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10384 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10385 Diag(Loc, diag::err_introducing_special_friend) << 10386 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10387 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10388 return 0; 10389 } 10390 } 10391 10392 // FIXME: This is an egregious hack to cope with cases where the scope stack 10393 // does not contain the declaration context, i.e., in an out-of-line 10394 // definition of a class. 10395 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10396 if (!DCScope) { 10397 FakeDCScope.setEntity(DC); 10398 DCScope = &FakeDCScope; 10399 } 10400 10401 bool AddToScope = true; 10402 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10403 move(TemplateParams), AddToScope); 10404 if (!ND) return 0; 10405 10406 assert(ND->getDeclContext() == DC); 10407 assert(ND->getLexicalDeclContext() == CurContext); 10408 10409 // Add the function declaration to the appropriate lookup tables, 10410 // adjusting the redeclarations list as necessary. We don't 10411 // want to do this yet if the friending class is dependent. 10412 // 10413 // Also update the scope-based lookup if the target context's 10414 // lookup context is in lexical scope. 10415 if (!CurContext->isDependentContext()) { 10416 DC = DC->getRedeclContext(); 10417 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 10418 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10419 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10420 } 10421 10422 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10423 D.getIdentifierLoc(), ND, 10424 DS.getFriendSpecLoc()); 10425 FrD->setAccess(AS_public); 10426 CurContext->addDecl(FrD); 10427 10428 if (ND->isInvalidDecl()) 10429 FrD->setInvalidDecl(); 10430 else { 10431 FunctionDecl *FD; 10432 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10433 FD = FTD->getTemplatedDecl(); 10434 else 10435 FD = cast<FunctionDecl>(ND); 10436 10437 // Mark templated-scope function declarations as unsupported. 10438 if (FD->getNumTemplateParameterLists()) 10439 FrD->setUnsupportedFriend(true); 10440 } 10441 10442 return ND; 10443} 10444 10445void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10446 AdjustDeclIfTemplate(Dcl); 10447 10448 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10449 if (!Fn) { 10450 Diag(DelLoc, diag::err_deleted_non_function); 10451 return; 10452 } 10453 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10454 Diag(DelLoc, diag::err_deleted_decl_not_first); 10455 Diag(Prev->getLocation(), diag::note_previous_declaration); 10456 // If the declaration wasn't the first, we delete the function anyway for 10457 // recovery. 10458 } 10459 Fn->setDeletedAsWritten(); 10460} 10461 10462void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10463 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10464 10465 if (MD) { 10466 if (MD->getParent()->isDependentType()) { 10467 MD->setDefaulted(); 10468 MD->setExplicitlyDefaulted(); 10469 return; 10470 } 10471 10472 CXXSpecialMember Member = getSpecialMember(MD); 10473 if (Member == CXXInvalid) { 10474 Diag(DefaultLoc, diag::err_default_special_members); 10475 return; 10476 } 10477 10478 MD->setDefaulted(); 10479 MD->setExplicitlyDefaulted(); 10480 10481 // If this definition appears within the record, do the checking when 10482 // the record is complete. 10483 const FunctionDecl *Primary = MD; 10484 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10485 // Find the uninstantiated declaration that actually had the '= default' 10486 // on it. 10487 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10488 10489 if (Primary == Primary->getCanonicalDecl()) 10490 return; 10491 10492 switch (Member) { 10493 case CXXDefaultConstructor: { 10494 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10495 CheckExplicitlyDefaultedDefaultConstructor(CD); 10496 if (!CD->isInvalidDecl()) 10497 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10498 break; 10499 } 10500 10501 case CXXCopyConstructor: { 10502 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10503 CheckExplicitlyDefaultedCopyConstructor(CD); 10504 if (!CD->isInvalidDecl()) 10505 DefineImplicitCopyConstructor(DefaultLoc, CD); 10506 break; 10507 } 10508 10509 case CXXCopyAssignment: { 10510 CheckExplicitlyDefaultedCopyAssignment(MD); 10511 if (!MD->isInvalidDecl()) 10512 DefineImplicitCopyAssignment(DefaultLoc, MD); 10513 break; 10514 } 10515 10516 case CXXDestructor: { 10517 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10518 CheckExplicitlyDefaultedDestructor(DD); 10519 if (!DD->isInvalidDecl()) 10520 DefineImplicitDestructor(DefaultLoc, DD); 10521 break; 10522 } 10523 10524 case CXXMoveConstructor: { 10525 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10526 CheckExplicitlyDefaultedMoveConstructor(CD); 10527 if (!CD->isInvalidDecl()) 10528 DefineImplicitMoveConstructor(DefaultLoc, CD); 10529 break; 10530 } 10531 10532 case CXXMoveAssignment: { 10533 CheckExplicitlyDefaultedMoveAssignment(MD); 10534 if (!MD->isInvalidDecl()) 10535 DefineImplicitMoveAssignment(DefaultLoc, MD); 10536 break; 10537 } 10538 10539 case CXXInvalid: 10540 llvm_unreachable("Invalid special member."); 10541 } 10542 } else { 10543 Diag(DefaultLoc, diag::err_default_special_members); 10544 } 10545} 10546 10547static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10548 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10549 Stmt *SubStmt = *CI; 10550 if (!SubStmt) 10551 continue; 10552 if (isa<ReturnStmt>(SubStmt)) 10553 Self.Diag(SubStmt->getSourceRange().getBegin(), 10554 diag::err_return_in_constructor_handler); 10555 if (!isa<Expr>(SubStmt)) 10556 SearchForReturnInStmt(Self, SubStmt); 10557 } 10558} 10559 10560void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10561 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10562 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10563 SearchForReturnInStmt(*this, Handler); 10564 } 10565} 10566 10567bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10568 const CXXMethodDecl *Old) { 10569 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10570 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10571 10572 if (Context.hasSameType(NewTy, OldTy) || 10573 NewTy->isDependentType() || OldTy->isDependentType()) 10574 return false; 10575 10576 // Check if the return types are covariant 10577 QualType NewClassTy, OldClassTy; 10578 10579 /// Both types must be pointers or references to classes. 10580 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10581 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10582 NewClassTy = NewPT->getPointeeType(); 10583 OldClassTy = OldPT->getPointeeType(); 10584 } 10585 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10586 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10587 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10588 NewClassTy = NewRT->getPointeeType(); 10589 OldClassTy = OldRT->getPointeeType(); 10590 } 10591 } 10592 } 10593 10594 // The return types aren't either both pointers or references to a class type. 10595 if (NewClassTy.isNull()) { 10596 Diag(New->getLocation(), 10597 diag::err_different_return_type_for_overriding_virtual_function) 10598 << New->getDeclName() << NewTy << OldTy; 10599 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10600 10601 return true; 10602 } 10603 10604 // C++ [class.virtual]p6: 10605 // If the return type of D::f differs from the return type of B::f, the 10606 // class type in the return type of D::f shall be complete at the point of 10607 // declaration of D::f or shall be the class type D. 10608 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10609 if (!RT->isBeingDefined() && 10610 RequireCompleteType(New->getLocation(), NewClassTy, 10611 PDiag(diag::err_covariant_return_incomplete) 10612 << New->getDeclName())) 10613 return true; 10614 } 10615 10616 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10617 // Check if the new class derives from the old class. 10618 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10619 Diag(New->getLocation(), 10620 diag::err_covariant_return_not_derived) 10621 << New->getDeclName() << NewTy << OldTy; 10622 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10623 return true; 10624 } 10625 10626 // Check if we the conversion from derived to base is valid. 10627 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10628 diag::err_covariant_return_inaccessible_base, 10629 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10630 // FIXME: Should this point to the return type? 10631 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10632 // FIXME: this note won't trigger for delayed access control 10633 // diagnostics, and it's impossible to get an undelayed error 10634 // here from access control during the original parse because 10635 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10636 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10637 return true; 10638 } 10639 } 10640 10641 // The qualifiers of the return types must be the same. 10642 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10643 Diag(New->getLocation(), 10644 diag::err_covariant_return_type_different_qualifications) 10645 << New->getDeclName() << NewTy << OldTy; 10646 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10647 return true; 10648 }; 10649 10650 10651 // The new class type must have the same or less qualifiers as the old type. 10652 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10653 Diag(New->getLocation(), 10654 diag::err_covariant_return_type_class_type_more_qualified) 10655 << New->getDeclName() << NewTy << OldTy; 10656 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10657 return true; 10658 }; 10659 10660 return false; 10661} 10662 10663/// \brief Mark the given method pure. 10664/// 10665/// \param Method the method to be marked pure. 10666/// 10667/// \param InitRange the source range that covers the "0" initializer. 10668bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10669 SourceLocation EndLoc = InitRange.getEnd(); 10670 if (EndLoc.isValid()) 10671 Method->setRangeEnd(EndLoc); 10672 10673 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10674 Method->setPure(); 10675 return false; 10676 } 10677 10678 if (!Method->isInvalidDecl()) 10679 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10680 << Method->getDeclName() << InitRange; 10681 return true; 10682} 10683 10684/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10685/// an initializer for the out-of-line declaration 'Dcl'. The scope 10686/// is a fresh scope pushed for just this purpose. 10687/// 10688/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10689/// static data member of class X, names should be looked up in the scope of 10690/// class X. 10691void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10692 // If there is no declaration, there was an error parsing it. 10693 if (D == 0 || D->isInvalidDecl()) return; 10694 10695 // We should only get called for declarations with scope specifiers, like: 10696 // int foo::bar; 10697 assert(D->isOutOfLine()); 10698 EnterDeclaratorContext(S, D->getDeclContext()); 10699} 10700 10701/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10702/// initializer for the out-of-line declaration 'D'. 10703void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10704 // If there is no declaration, there was an error parsing it. 10705 if (D == 0 || D->isInvalidDecl()) return; 10706 10707 assert(D->isOutOfLine()); 10708 ExitDeclaratorContext(S); 10709} 10710 10711/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10712/// C++ if/switch/while/for statement. 10713/// e.g: "if (int x = f()) {...}" 10714DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10715 // C++ 6.4p2: 10716 // The declarator shall not specify a function or an array. 10717 // The type-specifier-seq shall not contain typedef and shall not declare a 10718 // new class or enumeration. 10719 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10720 "Parser allowed 'typedef' as storage class of condition decl."); 10721 10722 Decl *Dcl = ActOnDeclarator(S, D); 10723 if (!Dcl) 10724 return true; 10725 10726 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10727 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10728 << D.getSourceRange(); 10729 return true; 10730 } 10731 10732 return Dcl; 10733} 10734 10735void Sema::LoadExternalVTableUses() { 10736 if (!ExternalSource) 10737 return; 10738 10739 SmallVector<ExternalVTableUse, 4> VTables; 10740 ExternalSource->ReadUsedVTables(VTables); 10741 SmallVector<VTableUse, 4> NewUses; 10742 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10743 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10744 = VTablesUsed.find(VTables[I].Record); 10745 // Even if a definition wasn't required before, it may be required now. 10746 if (Pos != VTablesUsed.end()) { 10747 if (!Pos->second && VTables[I].DefinitionRequired) 10748 Pos->second = true; 10749 continue; 10750 } 10751 10752 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10753 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10754 } 10755 10756 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10757} 10758 10759void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10760 bool DefinitionRequired) { 10761 // Ignore any vtable uses in unevaluated operands or for classes that do 10762 // not have a vtable. 10763 if (!Class->isDynamicClass() || Class->isDependentContext() || 10764 CurContext->isDependentContext() || 10765 ExprEvalContexts.back().Context == Unevaluated) 10766 return; 10767 10768 // Try to insert this class into the map. 10769 LoadExternalVTableUses(); 10770 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10771 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10772 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10773 if (!Pos.second) { 10774 // If we already had an entry, check to see if we are promoting this vtable 10775 // to required a definition. If so, we need to reappend to the VTableUses 10776 // list, since we may have already processed the first entry. 10777 if (DefinitionRequired && !Pos.first->second) { 10778 Pos.first->second = true; 10779 } else { 10780 // Otherwise, we can early exit. 10781 return; 10782 } 10783 } 10784 10785 // Local classes need to have their virtual members marked 10786 // immediately. For all other classes, we mark their virtual members 10787 // at the end of the translation unit. 10788 if (Class->isLocalClass()) 10789 MarkVirtualMembersReferenced(Loc, Class); 10790 else 10791 VTableUses.push_back(std::make_pair(Class, Loc)); 10792} 10793 10794bool Sema::DefineUsedVTables() { 10795 LoadExternalVTableUses(); 10796 if (VTableUses.empty()) 10797 return false; 10798 10799 // Note: The VTableUses vector could grow as a result of marking 10800 // the members of a class as "used", so we check the size each 10801 // time through the loop and prefer indices (with are stable) to 10802 // iterators (which are not). 10803 bool DefinedAnything = false; 10804 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10805 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10806 if (!Class) 10807 continue; 10808 10809 SourceLocation Loc = VTableUses[I].second; 10810 10811 // If this class has a key function, but that key function is 10812 // defined in another translation unit, we don't need to emit the 10813 // vtable even though we're using it. 10814 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10815 if (KeyFunction && !KeyFunction->hasBody()) { 10816 switch (KeyFunction->getTemplateSpecializationKind()) { 10817 case TSK_Undeclared: 10818 case TSK_ExplicitSpecialization: 10819 case TSK_ExplicitInstantiationDeclaration: 10820 // The key function is in another translation unit. 10821 continue; 10822 10823 case TSK_ExplicitInstantiationDefinition: 10824 case TSK_ImplicitInstantiation: 10825 // We will be instantiating the key function. 10826 break; 10827 } 10828 } else if (!KeyFunction) { 10829 // If we have a class with no key function that is the subject 10830 // of an explicit instantiation declaration, suppress the 10831 // vtable; it will live with the explicit instantiation 10832 // definition. 10833 bool IsExplicitInstantiationDeclaration 10834 = Class->getTemplateSpecializationKind() 10835 == TSK_ExplicitInstantiationDeclaration; 10836 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10837 REnd = Class->redecls_end(); 10838 R != REnd; ++R) { 10839 TemplateSpecializationKind TSK 10840 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10841 if (TSK == TSK_ExplicitInstantiationDeclaration) 10842 IsExplicitInstantiationDeclaration = true; 10843 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10844 IsExplicitInstantiationDeclaration = false; 10845 break; 10846 } 10847 } 10848 10849 if (IsExplicitInstantiationDeclaration) 10850 continue; 10851 } 10852 10853 // Mark all of the virtual members of this class as referenced, so 10854 // that we can build a vtable. Then, tell the AST consumer that a 10855 // vtable for this class is required. 10856 DefinedAnything = true; 10857 MarkVirtualMembersReferenced(Loc, Class); 10858 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10859 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10860 10861 // Optionally warn if we're emitting a weak vtable. 10862 if (Class->getLinkage() == ExternalLinkage && 10863 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10864 const FunctionDecl *KeyFunctionDef = 0; 10865 if (!KeyFunction || 10866 (KeyFunction->hasBody(KeyFunctionDef) && 10867 KeyFunctionDef->isInlined())) 10868 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10869 TSK_ExplicitInstantiationDefinition 10870 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10871 << Class; 10872 } 10873 } 10874 VTableUses.clear(); 10875 10876 return DefinedAnything; 10877} 10878 10879void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10880 const CXXRecordDecl *RD) { 10881 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10882 e = RD->method_end(); i != e; ++i) { 10883 CXXMethodDecl *MD = *i; 10884 10885 // C++ [basic.def.odr]p2: 10886 // [...] A virtual member function is used if it is not pure. [...] 10887 if (MD->isVirtual() && !MD->isPure()) 10888 MarkDeclarationReferenced(Loc, MD); 10889 } 10890 10891 // Only classes that have virtual bases need a VTT. 10892 if (RD->getNumVBases() == 0) 10893 return; 10894 10895 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10896 e = RD->bases_end(); i != e; ++i) { 10897 const CXXRecordDecl *Base = 10898 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10899 if (Base->getNumVBases() == 0) 10900 continue; 10901 MarkVirtualMembersReferenced(Loc, Base); 10902 } 10903} 10904 10905/// SetIvarInitializers - This routine builds initialization ASTs for the 10906/// Objective-C implementation whose ivars need be initialized. 10907void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10908 if (!getLangOptions().CPlusPlus) 10909 return; 10910 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10911 SmallVector<ObjCIvarDecl*, 8> ivars; 10912 CollectIvarsToConstructOrDestruct(OID, ivars); 10913 if (ivars.empty()) 10914 return; 10915 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10916 for (unsigned i = 0; i < ivars.size(); i++) { 10917 FieldDecl *Field = ivars[i]; 10918 if (Field->isInvalidDecl()) 10919 continue; 10920 10921 CXXCtorInitializer *Member; 10922 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10923 InitializationKind InitKind = 10924 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10925 10926 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10927 ExprResult MemberInit = 10928 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10929 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10930 // Note, MemberInit could actually come back empty if no initialization 10931 // is required (e.g., because it would call a trivial default constructor) 10932 if (!MemberInit.get() || MemberInit.isInvalid()) 10933 continue; 10934 10935 Member = 10936 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10937 SourceLocation(), 10938 MemberInit.takeAs<Expr>(), 10939 SourceLocation()); 10940 AllToInit.push_back(Member); 10941 10942 // Be sure that the destructor is accessible and is marked as referenced. 10943 if (const RecordType *RecordTy 10944 = Context.getBaseElementType(Field->getType()) 10945 ->getAs<RecordType>()) { 10946 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10947 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10948 MarkDeclarationReferenced(Field->getLocation(), Destructor); 10949 CheckDestructorAccess(Field->getLocation(), Destructor, 10950 PDiag(diag::err_access_dtor_ivar) 10951 << Context.getBaseElementType(Field->getType())); 10952 } 10953 } 10954 } 10955 ObjCImplementation->setIvarInitializers(Context, 10956 AllToInit.data(), AllToInit.size()); 10957 } 10958} 10959 10960static 10961void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10962 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10963 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10964 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10965 Sema &S) { 10966 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10967 CE = Current.end(); 10968 if (Ctor->isInvalidDecl()) 10969 return; 10970 10971 const FunctionDecl *FNTarget = 0; 10972 CXXConstructorDecl *Target; 10973 10974 // We ignore the result here since if we don't have a body, Target will be 10975 // null below. 10976 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10977 Target 10978= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10979 10980 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10981 // Avoid dereferencing a null pointer here. 10982 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10983 10984 if (!Current.insert(Canonical)) 10985 return; 10986 10987 // We know that beyond here, we aren't chaining into a cycle. 10988 if (!Target || !Target->isDelegatingConstructor() || 10989 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10990 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10991 Valid.insert(*CI); 10992 Current.clear(); 10993 // We've hit a cycle. 10994 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 10995 Current.count(TCanonical)) { 10996 // If we haven't diagnosed this cycle yet, do so now. 10997 if (!Invalid.count(TCanonical)) { 10998 S.Diag((*Ctor->init_begin())->getSourceLocation(), 10999 diag::warn_delegating_ctor_cycle) 11000 << Ctor; 11001 11002 // Don't add a note for a function delegating directo to itself. 11003 if (TCanonical != Canonical) 11004 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 11005 11006 CXXConstructorDecl *C = Target; 11007 while (C->getCanonicalDecl() != Canonical) { 11008 (void)C->getTargetConstructor()->hasBody(FNTarget); 11009 assert(FNTarget && "Ctor cycle through bodiless function"); 11010 11011 C 11012 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 11013 S.Diag(C->getLocation(), diag::note_which_delegates_to); 11014 } 11015 } 11016 11017 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11018 Invalid.insert(*CI); 11019 Current.clear(); 11020 } else { 11021 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 11022 } 11023} 11024 11025 11026void Sema::CheckDelegatingCtorCycles() { 11027 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 11028 11029 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11030 CE = Current.end(); 11031 11032 for (DelegatingCtorDeclsType::iterator 11033 I = DelegatingCtorDecls.begin(ExternalSource), 11034 E = DelegatingCtorDecls.end(); 11035 I != E; ++I) { 11036 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 11037 } 11038 11039 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 11040 (*CI)->setInvalidDecl(); 11041} 11042 11043/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 11044Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 11045 // Implicitly declared functions (e.g. copy constructors) are 11046 // __host__ __device__ 11047 if (D->isImplicit()) 11048 return CFT_HostDevice; 11049 11050 if (D->hasAttr<CUDAGlobalAttr>()) 11051 return CFT_Global; 11052 11053 if (D->hasAttr<CUDADeviceAttr>()) { 11054 if (D->hasAttr<CUDAHostAttr>()) 11055 return CFT_HostDevice; 11056 else 11057 return CFT_Device; 11058 } 11059 11060 return CFT_Host; 11061} 11062 11063bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 11064 CUDAFunctionTarget CalleeTarget) { 11065 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 11066 // Callable from the device only." 11067 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 11068 return true; 11069 11070 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 11071 // Callable from the host only." 11072 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 11073 // Callable from the host only." 11074 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 11075 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 11076 return true; 11077 11078 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 11079 return true; 11080 11081 return false; 11082} 11083