SemaDeclCXX.cpp revision f211662199c87461f3b1475a549ab439c63ca83b
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 const DeclSpec &DS, 1726 SourceLocation IdLoc, 1727 Expr *InitList, 1728 SourceLocation EllipsisLoc) { 1729 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1730 DS, IdLoc, MultiInitializer(InitList), 1731 EllipsisLoc); 1732} 1733 1734/// \brief Handle a C++ member initializer using parentheses syntax. 1735MemInitResult 1736Sema::ActOnMemInitializer(Decl *ConstructorD, 1737 Scope *S, 1738 CXXScopeSpec &SS, 1739 IdentifierInfo *MemberOrBase, 1740 ParsedType TemplateTypeTy, 1741 const DeclSpec &DS, 1742 SourceLocation IdLoc, 1743 SourceLocation LParenLoc, 1744 Expr **Args, unsigned NumArgs, 1745 SourceLocation RParenLoc, 1746 SourceLocation EllipsisLoc) { 1747 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1748 DS, IdLoc, MultiInitializer(LParenLoc, Args, 1749 NumArgs, RParenLoc), 1750 EllipsisLoc); 1751} 1752 1753namespace { 1754 1755// Callback to only accept typo corrections that can be a valid C++ member 1756// intializer: either a non-static field member or a base class. 1757class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 1758 public: 1759 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 1760 : ClassDecl(ClassDecl) {} 1761 1762 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 1763 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 1764 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 1765 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 1766 else 1767 return isa<TypeDecl>(ND); 1768 } 1769 return false; 1770 } 1771 1772 private: 1773 CXXRecordDecl *ClassDecl; 1774}; 1775 1776} 1777 1778/// \brief Handle a C++ member initializer. 1779MemInitResult 1780Sema::BuildMemInitializer(Decl *ConstructorD, 1781 Scope *S, 1782 CXXScopeSpec &SS, 1783 IdentifierInfo *MemberOrBase, 1784 ParsedType TemplateTypeTy, 1785 const DeclSpec &DS, 1786 SourceLocation IdLoc, 1787 const MultiInitializer &Args, 1788 SourceLocation EllipsisLoc) { 1789 if (!ConstructorD) 1790 return true; 1791 1792 AdjustDeclIfTemplate(ConstructorD); 1793 1794 CXXConstructorDecl *Constructor 1795 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1796 if (!Constructor) { 1797 // The user wrote a constructor initializer on a function that is 1798 // not a C++ constructor. Ignore the error for now, because we may 1799 // have more member initializers coming; we'll diagnose it just 1800 // once in ActOnMemInitializers. 1801 return true; 1802 } 1803 1804 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1805 1806 // C++ [class.base.init]p2: 1807 // Names in a mem-initializer-id are looked up in the scope of the 1808 // constructor's class and, if not found in that scope, are looked 1809 // up in the scope containing the constructor's definition. 1810 // [Note: if the constructor's class contains a member with the 1811 // same name as a direct or virtual base class of the class, a 1812 // mem-initializer-id naming the member or base class and composed 1813 // of a single identifier refers to the class member. A 1814 // mem-initializer-id for the hidden base class may be specified 1815 // using a qualified name. ] 1816 if (!SS.getScopeRep() && !TemplateTypeTy) { 1817 // Look for a member, first. 1818 DeclContext::lookup_result Result 1819 = ClassDecl->lookup(MemberOrBase); 1820 if (Result.first != Result.second) { 1821 ValueDecl *Member; 1822 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 1823 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 1824 if (EllipsisLoc.isValid()) 1825 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1826 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1827 1828 return BuildMemberInitializer(Member, Args, IdLoc); 1829 } 1830 } 1831 } 1832 // It didn't name a member, so see if it names a class. 1833 QualType BaseType; 1834 TypeSourceInfo *TInfo = 0; 1835 1836 if (TemplateTypeTy) { 1837 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1838 } else if (DS.getTypeSpecType() == TST_decltype) { 1839 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 1840 } else { 1841 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1842 LookupParsedName(R, S, &SS); 1843 1844 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1845 if (!TyD) { 1846 if (R.isAmbiguous()) return true; 1847 1848 // We don't want access-control diagnostics here. 1849 R.suppressDiagnostics(); 1850 1851 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1852 bool NotUnknownSpecialization = false; 1853 DeclContext *DC = computeDeclContext(SS, false); 1854 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1855 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1856 1857 if (!NotUnknownSpecialization) { 1858 // When the scope specifier can refer to a member of an unknown 1859 // specialization, we take it as a type name. 1860 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1861 SS.getWithLocInContext(Context), 1862 *MemberOrBase, IdLoc); 1863 if (BaseType.isNull()) 1864 return true; 1865 1866 R.clear(); 1867 R.setLookupName(MemberOrBase); 1868 } 1869 } 1870 1871 // If no results were found, try to correct typos. 1872 TypoCorrection Corr; 1873 MemInitializerValidatorCCC Validator(ClassDecl); 1874 if (R.empty() && BaseType.isNull() && 1875 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1876 &Validator, ClassDecl))) { 1877 std::string CorrectedStr(Corr.getAsString(getLangOptions())); 1878 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOptions())); 1879 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1880 // We have found a non-static data member with a similar 1881 // name to what was typed; complain and initialize that 1882 // member. 1883 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1884 << MemberOrBase << true << CorrectedQuotedStr 1885 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1886 Diag(Member->getLocation(), diag::note_previous_decl) 1887 << CorrectedQuotedStr; 1888 1889 return BuildMemberInitializer(Member, Args, IdLoc); 1890 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1891 const CXXBaseSpecifier *DirectBaseSpec; 1892 const CXXBaseSpecifier *VirtualBaseSpec; 1893 if (FindBaseInitializer(*this, ClassDecl, 1894 Context.getTypeDeclType(Type), 1895 DirectBaseSpec, VirtualBaseSpec)) { 1896 // We have found a direct or virtual base class with a 1897 // similar name to what was typed; complain and initialize 1898 // that base class. 1899 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1900 << MemberOrBase << false << CorrectedQuotedStr 1901 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1902 1903 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1904 : VirtualBaseSpec; 1905 Diag(BaseSpec->getSourceRange().getBegin(), 1906 diag::note_base_class_specified_here) 1907 << BaseSpec->getType() 1908 << BaseSpec->getSourceRange(); 1909 1910 TyD = Type; 1911 } 1912 } 1913 } 1914 1915 if (!TyD && BaseType.isNull()) { 1916 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1917 << MemberOrBase << SourceRange(IdLoc, Args.getEndLoc()); 1918 return true; 1919 } 1920 } 1921 1922 if (BaseType.isNull()) { 1923 BaseType = Context.getTypeDeclType(TyD); 1924 if (SS.isSet()) { 1925 NestedNameSpecifier *Qualifier = 1926 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1927 1928 // FIXME: preserve source range information 1929 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1930 } 1931 } 1932 } 1933 1934 if (!TInfo) 1935 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1936 1937 return BuildBaseInitializer(BaseType, TInfo, Args, ClassDecl, EllipsisLoc); 1938} 1939 1940/// Checks a member initializer expression for cases where reference (or 1941/// pointer) members are bound to by-value parameters (or their addresses). 1942static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 1943 Expr *Init, 1944 SourceLocation IdLoc) { 1945 QualType MemberTy = Member->getType(); 1946 1947 // We only handle pointers and references currently. 1948 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 1949 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 1950 return; 1951 1952 const bool IsPointer = MemberTy->isPointerType(); 1953 if (IsPointer) { 1954 if (const UnaryOperator *Op 1955 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 1956 // The only case we're worried about with pointers requires taking the 1957 // address. 1958 if (Op->getOpcode() != UO_AddrOf) 1959 return; 1960 1961 Init = Op->getSubExpr(); 1962 } else { 1963 // We only handle address-of expression initializers for pointers. 1964 return; 1965 } 1966 } 1967 1968 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 1969 // Taking the address of a temporary will be diagnosed as a hard error. 1970 if (IsPointer) 1971 return; 1972 1973 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 1974 << Member << Init->getSourceRange(); 1975 } else if (const DeclRefExpr *DRE 1976 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 1977 // We only warn when referring to a non-reference parameter declaration. 1978 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 1979 if (!Parameter || Parameter->getType()->isReferenceType()) 1980 return; 1981 1982 S.Diag(Init->getExprLoc(), 1983 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 1984 : diag::warn_bind_ref_member_to_parameter) 1985 << Member << Parameter << Init->getSourceRange(); 1986 } else { 1987 // Other initializers are fine. 1988 return; 1989 } 1990 1991 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 1992 << (unsigned)IsPointer; 1993} 1994 1995/// Checks an initializer expression for use of uninitialized fields, such as 1996/// containing the field that is being initialized. Returns true if there is an 1997/// uninitialized field was used an updates the SourceLocation parameter; false 1998/// otherwise. 1999static bool InitExprContainsUninitializedFields(const Stmt *S, 2000 const ValueDecl *LhsField, 2001 SourceLocation *L) { 2002 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 2003 2004 if (isa<CallExpr>(S)) { 2005 // Do not descend into function calls or constructors, as the use 2006 // of an uninitialized field may be valid. One would have to inspect 2007 // the contents of the function/ctor to determine if it is safe or not. 2008 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 2009 // may be safe, depending on what the function/ctor does. 2010 return false; 2011 } 2012 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 2013 const NamedDecl *RhsField = ME->getMemberDecl(); 2014 2015 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 2016 // The member expression points to a static data member. 2017 assert(VD->isStaticDataMember() && 2018 "Member points to non-static data member!"); 2019 (void)VD; 2020 return false; 2021 } 2022 2023 if (isa<EnumConstantDecl>(RhsField)) { 2024 // The member expression points to an enum. 2025 return false; 2026 } 2027 2028 if (RhsField == LhsField) { 2029 // Initializing a field with itself. Throw a warning. 2030 // But wait; there are exceptions! 2031 // Exception #1: The field may not belong to this record. 2032 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 2033 const Expr *base = ME->getBase(); 2034 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 2035 // Even though the field matches, it does not belong to this record. 2036 return false; 2037 } 2038 // None of the exceptions triggered; return true to indicate an 2039 // uninitialized field was used. 2040 *L = ME->getMemberLoc(); 2041 return true; 2042 } 2043 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 2044 // sizeof/alignof doesn't reference contents, do not warn. 2045 return false; 2046 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 2047 // address-of doesn't reference contents (the pointer may be dereferenced 2048 // in the same expression but it would be rare; and weird). 2049 if (UOE->getOpcode() == UO_AddrOf) 2050 return false; 2051 } 2052 for (Stmt::const_child_range it = S->children(); it; ++it) { 2053 if (!*it) { 2054 // An expression such as 'member(arg ?: "")' may trigger this. 2055 continue; 2056 } 2057 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 2058 return true; 2059 } 2060 return false; 2061} 2062 2063MemInitResult 2064Sema::BuildMemberInitializer(ValueDecl *Member, 2065 const MultiInitializer &Args, 2066 SourceLocation IdLoc) { 2067 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2068 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2069 assert((DirectMember || IndirectMember) && 2070 "Member must be a FieldDecl or IndirectFieldDecl"); 2071 2072 if (Args.DiagnoseUnexpandedParameterPack(*this)) 2073 return true; 2074 2075 if (Member->isInvalidDecl()) 2076 return true; 2077 2078 // Diagnose value-uses of fields to initialize themselves, e.g. 2079 // foo(foo) 2080 // where foo is not also a parameter to the constructor. 2081 // TODO: implement -Wuninitialized and fold this into that framework. 2082 for (MultiInitializer::iterator I = Args.begin(), E = Args.end(); 2083 I != E; ++I) { 2084 SourceLocation L; 2085 Expr *Arg = *I; 2086 if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Arg)) 2087 Arg = DIE->getInit(); 2088 if (InitExprContainsUninitializedFields(Arg, Member, &L)) { 2089 // FIXME: Return true in the case when other fields are used before being 2090 // uninitialized. For example, let this field be the i'th field. When 2091 // initializing the i'th field, throw a warning if any of the >= i'th 2092 // fields are used, as they are not yet initialized. 2093 // Right now we are only handling the case where the i'th field uses 2094 // itself in its initializer. 2095 Diag(L, diag::warn_field_is_uninit); 2096 } 2097 } 2098 2099 bool HasDependentArg = Args.isTypeDependent(); 2100 2101 Expr *Init; 2102 if (Member->getType()->isDependentType() || HasDependentArg) { 2103 // Can't check initialization for a member of dependent type or when 2104 // any of the arguments are type-dependent expressions. 2105 Init = Args.CreateInitExpr(Context,Member->getType().getNonReferenceType()); 2106 2107 DiscardCleanupsInEvaluationContext(); 2108 } else { 2109 // Initialize the member. 2110 InitializedEntity MemberEntity = 2111 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2112 : InitializedEntity::InitializeMember(IndirectMember, 0); 2113 InitializationKind Kind = 2114 InitializationKind::CreateDirect(IdLoc, Args.getStartLoc(), 2115 Args.getEndLoc()); 2116 2117 ExprResult MemberInit = Args.PerformInit(*this, MemberEntity, Kind); 2118 if (MemberInit.isInvalid()) 2119 return true; 2120 2121 CheckImplicitConversions(MemberInit.get(), Args.getStartLoc()); 2122 2123 // C++0x [class.base.init]p7: 2124 // The initialization of each base and member constitutes a 2125 // full-expression. 2126 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2127 if (MemberInit.isInvalid()) 2128 return true; 2129 2130 // If we are in a dependent context, template instantiation will 2131 // perform this type-checking again. Just save the arguments that we 2132 // received in a ParenListExpr. 2133 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2134 // of the information that we have about the member 2135 // initializer. However, deconstructing the ASTs is a dicey process, 2136 // and this approach is far more likely to get the corner cases right. 2137 if (CurContext->isDependentContext()) { 2138 Init = Args.CreateInitExpr(Context, 2139 Member->getType().getNonReferenceType()); 2140 } else { 2141 Init = MemberInit.get(); 2142 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2143 } 2144 } 2145 2146 if (DirectMember) { 2147 return new (Context) CXXCtorInitializer(Context, DirectMember, 2148 IdLoc, Args.getStartLoc(), 2149 Init, Args.getEndLoc()); 2150 } else { 2151 return new (Context) CXXCtorInitializer(Context, IndirectMember, 2152 IdLoc, Args.getStartLoc(), 2153 Init, Args.getEndLoc()); 2154 } 2155} 2156 2157MemInitResult 2158Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 2159 const MultiInitializer &Args, 2160 CXXRecordDecl *ClassDecl) { 2161 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2162 if (!LangOpts.CPlusPlus0x) 2163 return Diag(NameLoc, diag::err_delegating_ctor) 2164 << TInfo->getTypeLoc().getLocalSourceRange(); 2165 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2166 2167 // Initialize the object. 2168 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2169 QualType(ClassDecl->getTypeForDecl(), 0)); 2170 InitializationKind Kind = 2171 InitializationKind::CreateDirect(NameLoc, Args.getStartLoc(), 2172 Args.getEndLoc()); 2173 2174 ExprResult DelegationInit = Args.PerformInit(*this, DelegationEntity, Kind); 2175 if (DelegationInit.isInvalid()) 2176 return true; 2177 2178 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2179 "Delegating constructor with no target?"); 2180 2181 CheckImplicitConversions(DelegationInit.get(), Args.getStartLoc()); 2182 2183 // C++0x [class.base.init]p7: 2184 // The initialization of each base and member constitutes a 2185 // full-expression. 2186 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2187 if (DelegationInit.isInvalid()) 2188 return true; 2189 2190 return new (Context) CXXCtorInitializer(Context, TInfo, Args.getStartLoc(), 2191 DelegationInit.takeAs<Expr>(), 2192 Args.getEndLoc()); 2193} 2194 2195MemInitResult 2196Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2197 const MultiInitializer &Args, 2198 CXXRecordDecl *ClassDecl, 2199 SourceLocation EllipsisLoc) { 2200 bool HasDependentArg = Args.isTypeDependent(); 2201 2202 SourceLocation BaseLoc 2203 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2204 2205 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2206 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2207 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2208 2209 // C++ [class.base.init]p2: 2210 // [...] Unless the mem-initializer-id names a nonstatic data 2211 // member of the constructor's class or a direct or virtual base 2212 // of that class, the mem-initializer is ill-formed. A 2213 // mem-initializer-list can initialize a base class using any 2214 // name that denotes that base class type. 2215 bool Dependent = BaseType->isDependentType() || HasDependentArg; 2216 2217 if (EllipsisLoc.isValid()) { 2218 // This is a pack expansion. 2219 if (!BaseType->containsUnexpandedParameterPack()) { 2220 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2221 << SourceRange(BaseLoc, Args.getEndLoc()); 2222 2223 EllipsisLoc = SourceLocation(); 2224 } 2225 } else { 2226 // Check for any unexpanded parameter packs. 2227 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2228 return true; 2229 2230 if (Args.DiagnoseUnexpandedParameterPack(*this)) 2231 return true; 2232 } 2233 2234 // Check for direct and virtual base classes. 2235 const CXXBaseSpecifier *DirectBaseSpec = 0; 2236 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2237 if (!Dependent) { 2238 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2239 BaseType)) 2240 return BuildDelegatingInitializer(BaseTInfo, Args, ClassDecl); 2241 2242 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2243 VirtualBaseSpec); 2244 2245 // C++ [base.class.init]p2: 2246 // Unless the mem-initializer-id names a nonstatic data member of the 2247 // constructor's class or a direct or virtual base of that class, the 2248 // mem-initializer is ill-formed. 2249 if (!DirectBaseSpec && !VirtualBaseSpec) { 2250 // If the class has any dependent bases, then it's possible that 2251 // one of those types will resolve to the same type as 2252 // BaseType. Therefore, just treat this as a dependent base 2253 // class initialization. FIXME: Should we try to check the 2254 // initialization anyway? It seems odd. 2255 if (ClassDecl->hasAnyDependentBases()) 2256 Dependent = true; 2257 else 2258 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2259 << BaseType << Context.getTypeDeclType(ClassDecl) 2260 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2261 } 2262 } 2263 2264 if (Dependent) { 2265 // Can't check initialization for a base of dependent type or when 2266 // any of the arguments are type-dependent expressions. 2267 Expr *BaseInit = Args.CreateInitExpr(Context, BaseType); 2268 2269 DiscardCleanupsInEvaluationContext(); 2270 2271 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2272 /*IsVirtual=*/false, 2273 Args.getStartLoc(), BaseInit, 2274 Args.getEndLoc(), EllipsisLoc); 2275 } 2276 2277 // C++ [base.class.init]p2: 2278 // If a mem-initializer-id is ambiguous because it designates both 2279 // a direct non-virtual base class and an inherited virtual base 2280 // class, the mem-initializer is ill-formed. 2281 if (DirectBaseSpec && VirtualBaseSpec) 2282 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2283 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2284 2285 CXXBaseSpecifier *BaseSpec 2286 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2287 if (!BaseSpec) 2288 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2289 2290 // Initialize the base. 2291 InitializedEntity BaseEntity = 2292 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2293 InitializationKind Kind = 2294 InitializationKind::CreateDirect(BaseLoc, Args.getStartLoc(), 2295 Args.getEndLoc()); 2296 2297 ExprResult BaseInit = Args.PerformInit(*this, BaseEntity, Kind); 2298 if (BaseInit.isInvalid()) 2299 return true; 2300 2301 CheckImplicitConversions(BaseInit.get(), Args.getStartLoc()); 2302 2303 // C++0x [class.base.init]p7: 2304 // The initialization of each base and member constitutes a 2305 // full-expression. 2306 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2307 if (BaseInit.isInvalid()) 2308 return true; 2309 2310 // If we are in a dependent context, template instantiation will 2311 // perform this type-checking again. Just save the arguments that we 2312 // received in a ParenListExpr. 2313 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2314 // of the information that we have about the base 2315 // initializer. However, deconstructing the ASTs is a dicey process, 2316 // and this approach is far more likely to get the corner cases right. 2317 if (CurContext->isDependentContext()) 2318 BaseInit = Owned(Args.CreateInitExpr(Context, BaseType)); 2319 2320 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2321 BaseSpec->isVirtual(), 2322 Args.getStartLoc(), 2323 BaseInit.takeAs<Expr>(), 2324 Args.getEndLoc(), EllipsisLoc); 2325} 2326 2327// Create a static_cast\<T&&>(expr). 2328static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2329 QualType ExprType = E->getType(); 2330 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2331 SourceLocation ExprLoc = E->getLocStart(); 2332 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2333 TargetType, ExprLoc); 2334 2335 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2336 SourceRange(ExprLoc, ExprLoc), 2337 E->getSourceRange()).take(); 2338} 2339 2340/// ImplicitInitializerKind - How an implicit base or member initializer should 2341/// initialize its base or member. 2342enum ImplicitInitializerKind { 2343 IIK_Default, 2344 IIK_Copy, 2345 IIK_Move 2346}; 2347 2348static bool 2349BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2350 ImplicitInitializerKind ImplicitInitKind, 2351 CXXBaseSpecifier *BaseSpec, 2352 bool IsInheritedVirtualBase, 2353 CXXCtorInitializer *&CXXBaseInit) { 2354 InitializedEntity InitEntity 2355 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2356 IsInheritedVirtualBase); 2357 2358 ExprResult BaseInit; 2359 2360 switch (ImplicitInitKind) { 2361 case IIK_Default: { 2362 InitializationKind InitKind 2363 = InitializationKind::CreateDefault(Constructor->getLocation()); 2364 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2365 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2366 MultiExprArg(SemaRef, 0, 0)); 2367 break; 2368 } 2369 2370 case IIK_Move: 2371 case IIK_Copy: { 2372 bool Moving = ImplicitInitKind == IIK_Move; 2373 ParmVarDecl *Param = Constructor->getParamDecl(0); 2374 QualType ParamType = Param->getType().getNonReferenceType(); 2375 2376 SemaRef.MarkDeclarationReferenced(Constructor->getLocation(), Param); 2377 2378 Expr *CopyCtorArg = 2379 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 2380 Constructor->getLocation(), ParamType, 2381 VK_LValue, 0); 2382 2383 // Cast to the base class to avoid ambiguities. 2384 QualType ArgTy = 2385 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2386 ParamType.getQualifiers()); 2387 2388 if (Moving) { 2389 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2390 } 2391 2392 CXXCastPath BasePath; 2393 BasePath.push_back(BaseSpec); 2394 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2395 CK_UncheckedDerivedToBase, 2396 Moving ? VK_XValue : VK_LValue, 2397 &BasePath).take(); 2398 2399 InitializationKind InitKind 2400 = InitializationKind::CreateDirect(Constructor->getLocation(), 2401 SourceLocation(), SourceLocation()); 2402 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2403 &CopyCtorArg, 1); 2404 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2405 MultiExprArg(&CopyCtorArg, 1)); 2406 break; 2407 } 2408 } 2409 2410 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2411 if (BaseInit.isInvalid()) 2412 return true; 2413 2414 CXXBaseInit = 2415 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2416 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2417 SourceLocation()), 2418 BaseSpec->isVirtual(), 2419 SourceLocation(), 2420 BaseInit.takeAs<Expr>(), 2421 SourceLocation(), 2422 SourceLocation()); 2423 2424 return false; 2425} 2426 2427static bool RefersToRValueRef(Expr *MemRef) { 2428 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2429 return Referenced->getType()->isRValueReferenceType(); 2430} 2431 2432static bool 2433BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2434 ImplicitInitializerKind ImplicitInitKind, 2435 FieldDecl *Field, IndirectFieldDecl *Indirect, 2436 CXXCtorInitializer *&CXXMemberInit) { 2437 if (Field->isInvalidDecl()) 2438 return true; 2439 2440 SourceLocation Loc = Constructor->getLocation(); 2441 2442 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2443 bool Moving = ImplicitInitKind == IIK_Move; 2444 ParmVarDecl *Param = Constructor->getParamDecl(0); 2445 QualType ParamType = Param->getType().getNonReferenceType(); 2446 2447 SemaRef.MarkDeclarationReferenced(Constructor->getLocation(), Param); 2448 2449 // Suppress copying zero-width bitfields. 2450 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2451 return false; 2452 2453 Expr *MemberExprBase = 2454 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 2455 Loc, ParamType, VK_LValue, 0); 2456 2457 if (Moving) { 2458 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2459 } 2460 2461 // Build a reference to this field within the parameter. 2462 CXXScopeSpec SS; 2463 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2464 Sema::LookupMemberName); 2465 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2466 : cast<ValueDecl>(Field), AS_public); 2467 MemberLookup.resolveKind(); 2468 ExprResult CtorArg 2469 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2470 ParamType, Loc, 2471 /*IsArrow=*/false, 2472 SS, 2473 /*FirstQualifierInScope=*/0, 2474 MemberLookup, 2475 /*TemplateArgs=*/0); 2476 if (CtorArg.isInvalid()) 2477 return true; 2478 2479 // C++11 [class.copy]p15: 2480 // - if a member m has rvalue reference type T&&, it is direct-initialized 2481 // with static_cast<T&&>(x.m); 2482 if (RefersToRValueRef(CtorArg.get())) { 2483 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2484 } 2485 2486 // When the field we are copying is an array, create index variables for 2487 // each dimension of the array. We use these index variables to subscript 2488 // the source array, and other clients (e.g., CodeGen) will perform the 2489 // necessary iteration with these index variables. 2490 SmallVector<VarDecl *, 4> IndexVariables; 2491 QualType BaseType = Field->getType(); 2492 QualType SizeType = SemaRef.Context.getSizeType(); 2493 bool InitializingArray = false; 2494 while (const ConstantArrayType *Array 2495 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2496 InitializingArray = true; 2497 // Create the iteration variable for this array index. 2498 IdentifierInfo *IterationVarName = 0; 2499 { 2500 llvm::SmallString<8> Str; 2501 llvm::raw_svector_ostream OS(Str); 2502 OS << "__i" << IndexVariables.size(); 2503 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2504 } 2505 VarDecl *IterationVar 2506 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2507 IterationVarName, SizeType, 2508 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2509 SC_None, SC_None); 2510 IndexVariables.push_back(IterationVar); 2511 2512 // Create a reference to the iteration variable. 2513 ExprResult IterationVarRef 2514 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2515 assert(!IterationVarRef.isInvalid() && 2516 "Reference to invented variable cannot fail!"); 2517 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2518 assert(!IterationVarRef.isInvalid() && 2519 "Conversion of invented variable cannot fail!"); 2520 2521 // Subscript the array with this iteration variable. 2522 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2523 IterationVarRef.take(), 2524 Loc); 2525 if (CtorArg.isInvalid()) 2526 return true; 2527 2528 BaseType = Array->getElementType(); 2529 } 2530 2531 // The array subscript expression is an lvalue, which is wrong for moving. 2532 if (Moving && InitializingArray) 2533 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2534 2535 // Construct the entity that we will be initializing. For an array, this 2536 // will be first element in the array, which may require several levels 2537 // of array-subscript entities. 2538 SmallVector<InitializedEntity, 4> Entities; 2539 Entities.reserve(1 + IndexVariables.size()); 2540 if (Indirect) 2541 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2542 else 2543 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2544 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2545 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2546 0, 2547 Entities.back())); 2548 2549 // Direct-initialize to use the copy constructor. 2550 InitializationKind InitKind = 2551 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2552 2553 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2554 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2555 &CtorArgE, 1); 2556 2557 ExprResult MemberInit 2558 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2559 MultiExprArg(&CtorArgE, 1)); 2560 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2561 if (MemberInit.isInvalid()) 2562 return true; 2563 2564 if (Indirect) { 2565 assert(IndexVariables.size() == 0 && 2566 "Indirect field improperly initialized"); 2567 CXXMemberInit 2568 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2569 Loc, Loc, 2570 MemberInit.takeAs<Expr>(), 2571 Loc); 2572 } else 2573 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2574 Loc, MemberInit.takeAs<Expr>(), 2575 Loc, 2576 IndexVariables.data(), 2577 IndexVariables.size()); 2578 return false; 2579 } 2580 2581 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2582 2583 QualType FieldBaseElementType = 2584 SemaRef.Context.getBaseElementType(Field->getType()); 2585 2586 if (FieldBaseElementType->isRecordType()) { 2587 InitializedEntity InitEntity 2588 = Indirect? InitializedEntity::InitializeMember(Indirect) 2589 : InitializedEntity::InitializeMember(Field); 2590 InitializationKind InitKind = 2591 InitializationKind::CreateDefault(Loc); 2592 2593 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2594 ExprResult MemberInit = 2595 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2596 2597 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2598 if (MemberInit.isInvalid()) 2599 return true; 2600 2601 if (Indirect) 2602 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2603 Indirect, Loc, 2604 Loc, 2605 MemberInit.get(), 2606 Loc); 2607 else 2608 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2609 Field, Loc, Loc, 2610 MemberInit.get(), 2611 Loc); 2612 return false; 2613 } 2614 2615 if (!Field->getParent()->isUnion()) { 2616 if (FieldBaseElementType->isReferenceType()) { 2617 SemaRef.Diag(Constructor->getLocation(), 2618 diag::err_uninitialized_member_in_ctor) 2619 << (int)Constructor->isImplicit() 2620 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2621 << 0 << Field->getDeclName(); 2622 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2623 return true; 2624 } 2625 2626 if (FieldBaseElementType.isConstQualified()) { 2627 SemaRef.Diag(Constructor->getLocation(), 2628 diag::err_uninitialized_member_in_ctor) 2629 << (int)Constructor->isImplicit() 2630 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2631 << 1 << Field->getDeclName(); 2632 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2633 return true; 2634 } 2635 } 2636 2637 if (SemaRef.getLangOptions().ObjCAutoRefCount && 2638 FieldBaseElementType->isObjCRetainableType() && 2639 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2640 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2641 // Instant objects: 2642 // Default-initialize Objective-C pointers to NULL. 2643 CXXMemberInit 2644 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2645 Loc, Loc, 2646 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2647 Loc); 2648 return false; 2649 } 2650 2651 // Nothing to initialize. 2652 CXXMemberInit = 0; 2653 return false; 2654} 2655 2656namespace { 2657struct BaseAndFieldInfo { 2658 Sema &S; 2659 CXXConstructorDecl *Ctor; 2660 bool AnyErrorsInInits; 2661 ImplicitInitializerKind IIK; 2662 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2663 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2664 2665 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2666 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2667 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2668 if (Generated && Ctor->isCopyConstructor()) 2669 IIK = IIK_Copy; 2670 else if (Generated && Ctor->isMoveConstructor()) 2671 IIK = IIK_Move; 2672 else 2673 IIK = IIK_Default; 2674 } 2675 2676 bool isImplicitCopyOrMove() const { 2677 switch (IIK) { 2678 case IIK_Copy: 2679 case IIK_Move: 2680 return true; 2681 2682 case IIK_Default: 2683 return false; 2684 } 2685 2686 llvm_unreachable("Invalid ImplicitInitializerKind!"); 2687 } 2688}; 2689} 2690 2691/// \brief Determine whether the given indirect field declaration is somewhere 2692/// within an anonymous union. 2693static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2694 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2695 CEnd = F->chain_end(); 2696 C != CEnd; ++C) 2697 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2698 if (Record->isUnion()) 2699 return true; 2700 2701 return false; 2702} 2703 2704/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2705/// array type. 2706static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2707 if (T->isIncompleteArrayType()) 2708 return true; 2709 2710 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2711 if (!ArrayT->getSize()) 2712 return true; 2713 2714 T = ArrayT->getElementType(); 2715 } 2716 2717 return false; 2718} 2719 2720static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2721 FieldDecl *Field, 2722 IndirectFieldDecl *Indirect = 0) { 2723 2724 // Overwhelmingly common case: we have a direct initializer for this field. 2725 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2726 Info.AllToInit.push_back(Init); 2727 return false; 2728 } 2729 2730 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2731 // has a brace-or-equal-initializer, the entity is initialized as specified 2732 // in [dcl.init]. 2733 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 2734 CXXCtorInitializer *Init; 2735 if (Indirect) 2736 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2737 SourceLocation(), 2738 SourceLocation(), 0, 2739 SourceLocation()); 2740 else 2741 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2742 SourceLocation(), 2743 SourceLocation(), 0, 2744 SourceLocation()); 2745 Info.AllToInit.push_back(Init); 2746 return false; 2747 } 2748 2749 // Don't build an implicit initializer for union members if none was 2750 // explicitly specified. 2751 if (Field->getParent()->isUnion() || 2752 (Indirect && isWithinAnonymousUnion(Indirect))) 2753 return false; 2754 2755 // Don't initialize incomplete or zero-length arrays. 2756 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 2757 return false; 2758 2759 // Don't try to build an implicit initializer if there were semantic 2760 // errors in any of the initializers (and therefore we might be 2761 // missing some that the user actually wrote). 2762 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2763 return false; 2764 2765 CXXCtorInitializer *Init = 0; 2766 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2767 Indirect, Init)) 2768 return true; 2769 2770 if (Init) 2771 Info.AllToInit.push_back(Init); 2772 2773 return false; 2774} 2775 2776bool 2777Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2778 CXXCtorInitializer *Initializer) { 2779 assert(Initializer->isDelegatingInitializer()); 2780 Constructor->setNumCtorInitializers(1); 2781 CXXCtorInitializer **initializer = 2782 new (Context) CXXCtorInitializer*[1]; 2783 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2784 Constructor->setCtorInitializers(initializer); 2785 2786 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2787 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2788 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2789 } 2790 2791 DelegatingCtorDecls.push_back(Constructor); 2792 2793 return false; 2794} 2795 2796bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2797 CXXCtorInitializer **Initializers, 2798 unsigned NumInitializers, 2799 bool AnyErrors) { 2800 if (Constructor->isDependentContext()) { 2801 // Just store the initializers as written, they will be checked during 2802 // instantiation. 2803 if (NumInitializers > 0) { 2804 Constructor->setNumCtorInitializers(NumInitializers); 2805 CXXCtorInitializer **baseOrMemberInitializers = 2806 new (Context) CXXCtorInitializer*[NumInitializers]; 2807 memcpy(baseOrMemberInitializers, Initializers, 2808 NumInitializers * sizeof(CXXCtorInitializer*)); 2809 Constructor->setCtorInitializers(baseOrMemberInitializers); 2810 } 2811 2812 return false; 2813 } 2814 2815 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2816 2817 // We need to build the initializer AST according to order of construction 2818 // and not what user specified in the Initializers list. 2819 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2820 if (!ClassDecl) 2821 return true; 2822 2823 bool HadError = false; 2824 2825 for (unsigned i = 0; i < NumInitializers; i++) { 2826 CXXCtorInitializer *Member = Initializers[i]; 2827 2828 if (Member->isBaseInitializer()) 2829 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2830 else 2831 Info.AllBaseFields[Member->getAnyMember()] = Member; 2832 } 2833 2834 // Keep track of the direct virtual bases. 2835 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2836 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2837 E = ClassDecl->bases_end(); I != E; ++I) { 2838 if (I->isVirtual()) 2839 DirectVBases.insert(I); 2840 } 2841 2842 // Push virtual bases before others. 2843 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2844 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2845 2846 if (CXXCtorInitializer *Value 2847 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2848 Info.AllToInit.push_back(Value); 2849 } else if (!AnyErrors) { 2850 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2851 CXXCtorInitializer *CXXBaseInit; 2852 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2853 VBase, IsInheritedVirtualBase, 2854 CXXBaseInit)) { 2855 HadError = true; 2856 continue; 2857 } 2858 2859 Info.AllToInit.push_back(CXXBaseInit); 2860 } 2861 } 2862 2863 // Non-virtual bases. 2864 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2865 E = ClassDecl->bases_end(); Base != E; ++Base) { 2866 // Virtuals are in the virtual base list and already constructed. 2867 if (Base->isVirtual()) 2868 continue; 2869 2870 if (CXXCtorInitializer *Value 2871 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2872 Info.AllToInit.push_back(Value); 2873 } else if (!AnyErrors) { 2874 CXXCtorInitializer *CXXBaseInit; 2875 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2876 Base, /*IsInheritedVirtualBase=*/false, 2877 CXXBaseInit)) { 2878 HadError = true; 2879 continue; 2880 } 2881 2882 Info.AllToInit.push_back(CXXBaseInit); 2883 } 2884 } 2885 2886 // Fields. 2887 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 2888 MemEnd = ClassDecl->decls_end(); 2889 Mem != MemEnd; ++Mem) { 2890 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 2891 // C++ [class.bit]p2: 2892 // A declaration for a bit-field that omits the identifier declares an 2893 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 2894 // initialized. 2895 if (F->isUnnamedBitfield()) 2896 continue; 2897 2898 // If we're not generating the implicit copy/move constructor, then we'll 2899 // handle anonymous struct/union fields based on their individual 2900 // indirect fields. 2901 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 2902 continue; 2903 2904 if (CollectFieldInitializer(*this, Info, F)) 2905 HadError = true; 2906 continue; 2907 } 2908 2909 // Beyond this point, we only consider default initialization. 2910 if (Info.IIK != IIK_Default) 2911 continue; 2912 2913 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 2914 if (F->getType()->isIncompleteArrayType()) { 2915 assert(ClassDecl->hasFlexibleArrayMember() && 2916 "Incomplete array type is not valid"); 2917 continue; 2918 } 2919 2920 // Initialize each field of an anonymous struct individually. 2921 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 2922 HadError = true; 2923 2924 continue; 2925 } 2926 } 2927 2928 NumInitializers = Info.AllToInit.size(); 2929 if (NumInitializers > 0) { 2930 Constructor->setNumCtorInitializers(NumInitializers); 2931 CXXCtorInitializer **baseOrMemberInitializers = 2932 new (Context) CXXCtorInitializer*[NumInitializers]; 2933 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2934 NumInitializers * sizeof(CXXCtorInitializer*)); 2935 Constructor->setCtorInitializers(baseOrMemberInitializers); 2936 2937 // Constructors implicitly reference the base and member 2938 // destructors. 2939 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2940 Constructor->getParent()); 2941 } 2942 2943 return HadError; 2944} 2945 2946static void *GetKeyForTopLevelField(FieldDecl *Field) { 2947 // For anonymous unions, use the class declaration as the key. 2948 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2949 if (RT->getDecl()->isAnonymousStructOrUnion()) 2950 return static_cast<void *>(RT->getDecl()); 2951 } 2952 return static_cast<void *>(Field); 2953} 2954 2955static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2956 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2957} 2958 2959static void *GetKeyForMember(ASTContext &Context, 2960 CXXCtorInitializer *Member) { 2961 if (!Member->isAnyMemberInitializer()) 2962 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2963 2964 // For fields injected into the class via declaration of an anonymous union, 2965 // use its anonymous union class declaration as the unique key. 2966 FieldDecl *Field = Member->getAnyMember(); 2967 2968 // If the field is a member of an anonymous struct or union, our key 2969 // is the anonymous record decl that's a direct child of the class. 2970 RecordDecl *RD = Field->getParent(); 2971 if (RD->isAnonymousStructOrUnion()) { 2972 while (true) { 2973 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2974 if (Parent->isAnonymousStructOrUnion()) 2975 RD = Parent; 2976 else 2977 break; 2978 } 2979 2980 return static_cast<void *>(RD); 2981 } 2982 2983 return static_cast<void *>(Field); 2984} 2985 2986static void 2987DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2988 const CXXConstructorDecl *Constructor, 2989 CXXCtorInitializer **Inits, 2990 unsigned NumInits) { 2991 if (Constructor->getDeclContext()->isDependentContext()) 2992 return; 2993 2994 // Don't check initializers order unless the warning is enabled at the 2995 // location of at least one initializer. 2996 bool ShouldCheckOrder = false; 2997 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2998 CXXCtorInitializer *Init = Inits[InitIndex]; 2999 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3000 Init->getSourceLocation()) 3001 != DiagnosticsEngine::Ignored) { 3002 ShouldCheckOrder = true; 3003 break; 3004 } 3005 } 3006 if (!ShouldCheckOrder) 3007 return; 3008 3009 // Build the list of bases and members in the order that they'll 3010 // actually be initialized. The explicit initializers should be in 3011 // this same order but may be missing things. 3012 SmallVector<const void*, 32> IdealInitKeys; 3013 3014 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3015 3016 // 1. Virtual bases. 3017 for (CXXRecordDecl::base_class_const_iterator VBase = 3018 ClassDecl->vbases_begin(), 3019 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3020 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3021 3022 // 2. Non-virtual bases. 3023 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3024 E = ClassDecl->bases_end(); Base != E; ++Base) { 3025 if (Base->isVirtual()) 3026 continue; 3027 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3028 } 3029 3030 // 3. Direct fields. 3031 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3032 E = ClassDecl->field_end(); Field != E; ++Field) { 3033 if (Field->isUnnamedBitfield()) 3034 continue; 3035 3036 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 3037 } 3038 3039 unsigned NumIdealInits = IdealInitKeys.size(); 3040 unsigned IdealIndex = 0; 3041 3042 CXXCtorInitializer *PrevInit = 0; 3043 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3044 CXXCtorInitializer *Init = Inits[InitIndex]; 3045 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3046 3047 // Scan forward to try to find this initializer in the idealized 3048 // initializers list. 3049 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3050 if (InitKey == IdealInitKeys[IdealIndex]) 3051 break; 3052 3053 // If we didn't find this initializer, it must be because we 3054 // scanned past it on a previous iteration. That can only 3055 // happen if we're out of order; emit a warning. 3056 if (IdealIndex == NumIdealInits && PrevInit) { 3057 Sema::SemaDiagnosticBuilder D = 3058 SemaRef.Diag(PrevInit->getSourceLocation(), 3059 diag::warn_initializer_out_of_order); 3060 3061 if (PrevInit->isAnyMemberInitializer()) 3062 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3063 else 3064 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3065 3066 if (Init->isAnyMemberInitializer()) 3067 D << 0 << Init->getAnyMember()->getDeclName(); 3068 else 3069 D << 1 << Init->getTypeSourceInfo()->getType(); 3070 3071 // Move back to the initializer's location in the ideal list. 3072 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3073 if (InitKey == IdealInitKeys[IdealIndex]) 3074 break; 3075 3076 assert(IdealIndex != NumIdealInits && 3077 "initializer not found in initializer list"); 3078 } 3079 3080 PrevInit = Init; 3081 } 3082} 3083 3084namespace { 3085bool CheckRedundantInit(Sema &S, 3086 CXXCtorInitializer *Init, 3087 CXXCtorInitializer *&PrevInit) { 3088 if (!PrevInit) { 3089 PrevInit = Init; 3090 return false; 3091 } 3092 3093 if (FieldDecl *Field = Init->getMember()) 3094 S.Diag(Init->getSourceLocation(), 3095 diag::err_multiple_mem_initialization) 3096 << Field->getDeclName() 3097 << Init->getSourceRange(); 3098 else { 3099 const Type *BaseClass = Init->getBaseClass(); 3100 assert(BaseClass && "neither field nor base"); 3101 S.Diag(Init->getSourceLocation(), 3102 diag::err_multiple_base_initialization) 3103 << QualType(BaseClass, 0) 3104 << Init->getSourceRange(); 3105 } 3106 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3107 << 0 << PrevInit->getSourceRange(); 3108 3109 return true; 3110} 3111 3112typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3113typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3114 3115bool CheckRedundantUnionInit(Sema &S, 3116 CXXCtorInitializer *Init, 3117 RedundantUnionMap &Unions) { 3118 FieldDecl *Field = Init->getAnyMember(); 3119 RecordDecl *Parent = Field->getParent(); 3120 NamedDecl *Child = Field; 3121 3122 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3123 if (Parent->isUnion()) { 3124 UnionEntry &En = Unions[Parent]; 3125 if (En.first && En.first != Child) { 3126 S.Diag(Init->getSourceLocation(), 3127 diag::err_multiple_mem_union_initialization) 3128 << Field->getDeclName() 3129 << Init->getSourceRange(); 3130 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3131 << 0 << En.second->getSourceRange(); 3132 return true; 3133 } 3134 if (!En.first) { 3135 En.first = Child; 3136 En.second = Init; 3137 } 3138 if (!Parent->isAnonymousStructOrUnion()) 3139 return false; 3140 } 3141 3142 Child = Parent; 3143 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3144 } 3145 3146 return false; 3147} 3148} 3149 3150/// ActOnMemInitializers - Handle the member initializers for a constructor. 3151void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3152 SourceLocation ColonLoc, 3153 CXXCtorInitializer **meminits, 3154 unsigned NumMemInits, 3155 bool AnyErrors) { 3156 if (!ConstructorDecl) 3157 return; 3158 3159 AdjustDeclIfTemplate(ConstructorDecl); 3160 3161 CXXConstructorDecl *Constructor 3162 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3163 3164 if (!Constructor) { 3165 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3166 return; 3167 } 3168 3169 CXXCtorInitializer **MemInits = 3170 reinterpret_cast<CXXCtorInitializer **>(meminits); 3171 3172 // Mapping for the duplicate initializers check. 3173 // For member initializers, this is keyed with a FieldDecl*. 3174 // For base initializers, this is keyed with a Type*. 3175 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3176 3177 // Mapping for the inconsistent anonymous-union initializers check. 3178 RedundantUnionMap MemberUnions; 3179 3180 bool HadError = false; 3181 for (unsigned i = 0; i < NumMemInits; i++) { 3182 CXXCtorInitializer *Init = MemInits[i]; 3183 3184 // Set the source order index. 3185 Init->setSourceOrder(i); 3186 3187 if (Init->isAnyMemberInitializer()) { 3188 FieldDecl *Field = Init->getAnyMember(); 3189 if (CheckRedundantInit(*this, Init, Members[Field]) || 3190 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3191 HadError = true; 3192 } else if (Init->isBaseInitializer()) { 3193 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3194 if (CheckRedundantInit(*this, Init, Members[Key])) 3195 HadError = true; 3196 } else { 3197 assert(Init->isDelegatingInitializer()); 3198 // This must be the only initializer 3199 if (i != 0 || NumMemInits > 1) { 3200 Diag(MemInits[0]->getSourceLocation(), 3201 diag::err_delegating_initializer_alone) 3202 << MemInits[0]->getSourceRange(); 3203 HadError = true; 3204 // We will treat this as being the only initializer. 3205 } 3206 SetDelegatingInitializer(Constructor, MemInits[i]); 3207 // Return immediately as the initializer is set. 3208 return; 3209 } 3210 } 3211 3212 if (HadError) 3213 return; 3214 3215 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3216 3217 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3218} 3219 3220void 3221Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3222 CXXRecordDecl *ClassDecl) { 3223 // Ignore dependent contexts. Also ignore unions, since their members never 3224 // have destructors implicitly called. 3225 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3226 return; 3227 3228 // FIXME: all the access-control diagnostics are positioned on the 3229 // field/base declaration. That's probably good; that said, the 3230 // user might reasonably want to know why the destructor is being 3231 // emitted, and we currently don't say. 3232 3233 // Non-static data members. 3234 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3235 E = ClassDecl->field_end(); I != E; ++I) { 3236 FieldDecl *Field = *I; 3237 if (Field->isInvalidDecl()) 3238 continue; 3239 3240 // Don't destroy incomplete or zero-length arrays. 3241 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3242 continue; 3243 3244 QualType FieldType = Context.getBaseElementType(Field->getType()); 3245 3246 const RecordType* RT = FieldType->getAs<RecordType>(); 3247 if (!RT) 3248 continue; 3249 3250 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3251 if (FieldClassDecl->isInvalidDecl()) 3252 continue; 3253 if (FieldClassDecl->hasTrivialDestructor()) 3254 continue; 3255 3256 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3257 assert(Dtor && "No dtor found for FieldClassDecl!"); 3258 CheckDestructorAccess(Field->getLocation(), Dtor, 3259 PDiag(diag::err_access_dtor_field) 3260 << Field->getDeclName() 3261 << FieldType); 3262 3263 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3264 } 3265 3266 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3267 3268 // Bases. 3269 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3270 E = ClassDecl->bases_end(); Base != E; ++Base) { 3271 // Bases are always records in a well-formed non-dependent class. 3272 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3273 3274 // Remember direct virtual bases. 3275 if (Base->isVirtual()) 3276 DirectVirtualBases.insert(RT); 3277 3278 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3279 // If our base class is invalid, we probably can't get its dtor anyway. 3280 if (BaseClassDecl->isInvalidDecl()) 3281 continue; 3282 // Ignore trivial destructors. 3283 if (BaseClassDecl->hasTrivialDestructor()) 3284 continue; 3285 3286 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3287 assert(Dtor && "No dtor found for BaseClassDecl!"); 3288 3289 // FIXME: caret should be on the start of the class name 3290 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 3291 PDiag(diag::err_access_dtor_base) 3292 << Base->getType() 3293 << Base->getSourceRange()); 3294 3295 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3296 } 3297 3298 // Virtual bases. 3299 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3300 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3301 3302 // Bases are always records in a well-formed non-dependent class. 3303 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 3304 3305 // Ignore direct virtual bases. 3306 if (DirectVirtualBases.count(RT)) 3307 continue; 3308 3309 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3310 // If our base class is invalid, we probably can't get its dtor anyway. 3311 if (BaseClassDecl->isInvalidDecl()) 3312 continue; 3313 // Ignore trivial destructors. 3314 if (BaseClassDecl->hasTrivialDestructor()) 3315 continue; 3316 3317 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3318 assert(Dtor && "No dtor found for BaseClassDecl!"); 3319 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3320 PDiag(diag::err_access_dtor_vbase) 3321 << VBase->getType()); 3322 3323 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3324 } 3325} 3326 3327void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3328 if (!CDtorDecl) 3329 return; 3330 3331 if (CXXConstructorDecl *Constructor 3332 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3333 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3334} 3335 3336bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3337 unsigned DiagID, AbstractDiagSelID SelID) { 3338 if (SelID == -1) 3339 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 3340 else 3341 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 3342} 3343 3344bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3345 const PartialDiagnostic &PD) { 3346 if (!getLangOptions().CPlusPlus) 3347 return false; 3348 3349 if (const ArrayType *AT = Context.getAsArrayType(T)) 3350 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3351 3352 if (const PointerType *PT = T->getAs<PointerType>()) { 3353 // Find the innermost pointer type. 3354 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3355 PT = T; 3356 3357 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3358 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3359 } 3360 3361 const RecordType *RT = T->getAs<RecordType>(); 3362 if (!RT) 3363 return false; 3364 3365 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3366 3367 // We can't answer whether something is abstract until it has a 3368 // definition. If it's currently being defined, we'll walk back 3369 // over all the declarations when we have a full definition. 3370 const CXXRecordDecl *Def = RD->getDefinition(); 3371 if (!Def || Def->isBeingDefined()) 3372 return false; 3373 3374 if (!RD->isAbstract()) 3375 return false; 3376 3377 Diag(Loc, PD) << RD->getDeclName(); 3378 DiagnoseAbstractType(RD); 3379 3380 return true; 3381} 3382 3383void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3384 // Check if we've already emitted the list of pure virtual functions 3385 // for this class. 3386 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3387 return; 3388 3389 CXXFinalOverriderMap FinalOverriders; 3390 RD->getFinalOverriders(FinalOverriders); 3391 3392 // Keep a set of seen pure methods so we won't diagnose the same method 3393 // more than once. 3394 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3395 3396 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3397 MEnd = FinalOverriders.end(); 3398 M != MEnd; 3399 ++M) { 3400 for (OverridingMethods::iterator SO = M->second.begin(), 3401 SOEnd = M->second.end(); 3402 SO != SOEnd; ++SO) { 3403 // C++ [class.abstract]p4: 3404 // A class is abstract if it contains or inherits at least one 3405 // pure virtual function for which the final overrider is pure 3406 // virtual. 3407 3408 // 3409 if (SO->second.size() != 1) 3410 continue; 3411 3412 if (!SO->second.front().Method->isPure()) 3413 continue; 3414 3415 if (!SeenPureMethods.insert(SO->second.front().Method)) 3416 continue; 3417 3418 Diag(SO->second.front().Method->getLocation(), 3419 diag::note_pure_virtual_function) 3420 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3421 } 3422 } 3423 3424 if (!PureVirtualClassDiagSet) 3425 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3426 PureVirtualClassDiagSet->insert(RD); 3427} 3428 3429namespace { 3430struct AbstractUsageInfo { 3431 Sema &S; 3432 CXXRecordDecl *Record; 3433 CanQualType AbstractType; 3434 bool Invalid; 3435 3436 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3437 : S(S), Record(Record), 3438 AbstractType(S.Context.getCanonicalType( 3439 S.Context.getTypeDeclType(Record))), 3440 Invalid(false) {} 3441 3442 void DiagnoseAbstractType() { 3443 if (Invalid) return; 3444 S.DiagnoseAbstractType(Record); 3445 Invalid = true; 3446 } 3447 3448 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3449}; 3450 3451struct CheckAbstractUsage { 3452 AbstractUsageInfo &Info; 3453 const NamedDecl *Ctx; 3454 3455 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3456 : Info(Info), Ctx(Ctx) {} 3457 3458 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3459 switch (TL.getTypeLocClass()) { 3460#define ABSTRACT_TYPELOC(CLASS, PARENT) 3461#define TYPELOC(CLASS, PARENT) \ 3462 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3463#include "clang/AST/TypeLocNodes.def" 3464 } 3465 } 3466 3467 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3468 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3469 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3470 if (!TL.getArg(I)) 3471 continue; 3472 3473 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3474 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3475 } 3476 } 3477 3478 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3479 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3480 } 3481 3482 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3483 // Visit the type parameters from a permissive context. 3484 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3485 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3486 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3487 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3488 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3489 // TODO: other template argument types? 3490 } 3491 } 3492 3493 // Visit pointee types from a permissive context. 3494#define CheckPolymorphic(Type) \ 3495 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3496 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3497 } 3498 CheckPolymorphic(PointerTypeLoc) 3499 CheckPolymorphic(ReferenceTypeLoc) 3500 CheckPolymorphic(MemberPointerTypeLoc) 3501 CheckPolymorphic(BlockPointerTypeLoc) 3502 CheckPolymorphic(AtomicTypeLoc) 3503 3504 /// Handle all the types we haven't given a more specific 3505 /// implementation for above. 3506 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3507 // Every other kind of type that we haven't called out already 3508 // that has an inner type is either (1) sugar or (2) contains that 3509 // inner type in some way as a subobject. 3510 if (TypeLoc Next = TL.getNextTypeLoc()) 3511 return Visit(Next, Sel); 3512 3513 // If there's no inner type and we're in a permissive context, 3514 // don't diagnose. 3515 if (Sel == Sema::AbstractNone) return; 3516 3517 // Check whether the type matches the abstract type. 3518 QualType T = TL.getType(); 3519 if (T->isArrayType()) { 3520 Sel = Sema::AbstractArrayType; 3521 T = Info.S.Context.getBaseElementType(T); 3522 } 3523 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3524 if (CT != Info.AbstractType) return; 3525 3526 // It matched; do some magic. 3527 if (Sel == Sema::AbstractArrayType) { 3528 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3529 << T << TL.getSourceRange(); 3530 } else { 3531 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3532 << Sel << T << TL.getSourceRange(); 3533 } 3534 Info.DiagnoseAbstractType(); 3535 } 3536}; 3537 3538void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3539 Sema::AbstractDiagSelID Sel) { 3540 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3541} 3542 3543} 3544 3545/// Check for invalid uses of an abstract type in a method declaration. 3546static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3547 CXXMethodDecl *MD) { 3548 // No need to do the check on definitions, which require that 3549 // the return/param types be complete. 3550 if (MD->doesThisDeclarationHaveABody()) 3551 return; 3552 3553 // For safety's sake, just ignore it if we don't have type source 3554 // information. This should never happen for non-implicit methods, 3555 // but... 3556 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3557 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3558} 3559 3560/// Check for invalid uses of an abstract type within a class definition. 3561static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3562 CXXRecordDecl *RD) { 3563 for (CXXRecordDecl::decl_iterator 3564 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3565 Decl *D = *I; 3566 if (D->isImplicit()) continue; 3567 3568 // Methods and method templates. 3569 if (isa<CXXMethodDecl>(D)) { 3570 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3571 } else if (isa<FunctionTemplateDecl>(D)) { 3572 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3573 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3574 3575 // Fields and static variables. 3576 } else if (isa<FieldDecl>(D)) { 3577 FieldDecl *FD = cast<FieldDecl>(D); 3578 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3579 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3580 } else if (isa<VarDecl>(D)) { 3581 VarDecl *VD = cast<VarDecl>(D); 3582 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3583 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3584 3585 // Nested classes and class templates. 3586 } else if (isa<CXXRecordDecl>(D)) { 3587 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3588 } else if (isa<ClassTemplateDecl>(D)) { 3589 CheckAbstractClassUsage(Info, 3590 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3591 } 3592 } 3593} 3594 3595/// \brief Perform semantic checks on a class definition that has been 3596/// completing, introducing implicitly-declared members, checking for 3597/// abstract types, etc. 3598void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3599 if (!Record) 3600 return; 3601 3602 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3603 AbstractUsageInfo Info(*this, Record); 3604 CheckAbstractClassUsage(Info, Record); 3605 } 3606 3607 // If this is not an aggregate type and has no user-declared constructor, 3608 // complain about any non-static data members of reference or const scalar 3609 // type, since they will never get initializers. 3610 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3611 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 3612 bool Complained = false; 3613 for (RecordDecl::field_iterator F = Record->field_begin(), 3614 FEnd = Record->field_end(); 3615 F != FEnd; ++F) { 3616 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3617 continue; 3618 3619 if (F->getType()->isReferenceType() || 3620 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3621 if (!Complained) { 3622 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3623 << Record->getTagKind() << Record; 3624 Complained = true; 3625 } 3626 3627 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3628 << F->getType()->isReferenceType() 3629 << F->getDeclName(); 3630 } 3631 } 3632 } 3633 3634 if (Record->isDynamicClass() && !Record->isDependentType()) 3635 DynamicClasses.push_back(Record); 3636 3637 if (Record->getIdentifier()) { 3638 // C++ [class.mem]p13: 3639 // If T is the name of a class, then each of the following shall have a 3640 // name different from T: 3641 // - every member of every anonymous union that is a member of class T. 3642 // 3643 // C++ [class.mem]p14: 3644 // In addition, if class T has a user-declared constructor (12.1), every 3645 // non-static data member of class T shall have a name different from T. 3646 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3647 R.first != R.second; ++R.first) { 3648 NamedDecl *D = *R.first; 3649 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3650 isa<IndirectFieldDecl>(D)) { 3651 Diag(D->getLocation(), diag::err_member_name_of_class) 3652 << D->getDeclName(); 3653 break; 3654 } 3655 } 3656 } 3657 3658 // Warn if the class has virtual methods but non-virtual public destructor. 3659 if (Record->isPolymorphic() && !Record->isDependentType()) { 3660 CXXDestructorDecl *dtor = Record->getDestructor(); 3661 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3662 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3663 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3664 } 3665 3666 // See if a method overloads virtual methods in a base 3667 /// class without overriding any. 3668 if (!Record->isDependentType()) { 3669 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3670 MEnd = Record->method_end(); 3671 M != MEnd; ++M) { 3672 if (!(*M)->isStatic()) 3673 DiagnoseHiddenVirtualMethods(Record, *M); 3674 } 3675 } 3676 3677 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3678 // function that is not a constructor declares that member function to be 3679 // const. [...] The class of which that function is a member shall be 3680 // a literal type. 3681 // 3682 // It's fine to diagnose constructors here too: such constructors cannot 3683 // produce a constant expression, so are ill-formed (no diagnostic required). 3684 // 3685 // If the class has virtual bases, any constexpr members will already have 3686 // been diagnosed by the checks performed on the member declaration, so 3687 // suppress this (less useful) diagnostic. 3688 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3689 !Record->isLiteral() && !Record->getNumVBases()) { 3690 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3691 MEnd = Record->method_end(); 3692 M != MEnd; ++M) { 3693 if (M->isConstexpr() && M->isInstance()) { 3694 switch (Record->getTemplateSpecializationKind()) { 3695 case TSK_ImplicitInstantiation: 3696 case TSK_ExplicitInstantiationDeclaration: 3697 case TSK_ExplicitInstantiationDefinition: 3698 // If a template instantiates to a non-literal type, but its members 3699 // instantiate to constexpr functions, the template is technically 3700 // ill-formed, but we allow it for sanity. Such members are treated as 3701 // non-constexpr. 3702 (*M)->setConstexpr(false); 3703 continue; 3704 3705 case TSK_Undeclared: 3706 case TSK_ExplicitSpecialization: 3707 RequireLiteralType((*M)->getLocation(), Context.getRecordType(Record), 3708 PDiag(diag::err_constexpr_method_non_literal)); 3709 break; 3710 } 3711 3712 // Only produce one error per class. 3713 break; 3714 } 3715 } 3716 } 3717 3718 // Declare inherited constructors. We do this eagerly here because: 3719 // - The standard requires an eager diagnostic for conflicting inherited 3720 // constructors from different classes. 3721 // - The lazy declaration of the other implicit constructors is so as to not 3722 // waste space and performance on classes that are not meant to be 3723 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3724 // have inherited constructors. 3725 DeclareInheritedConstructors(Record); 3726 3727 if (!Record->isDependentType()) 3728 CheckExplicitlyDefaultedMethods(Record); 3729} 3730 3731void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3732 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3733 ME = Record->method_end(); 3734 MI != ME; ++MI) { 3735 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3736 switch (getSpecialMember(*MI)) { 3737 case CXXDefaultConstructor: 3738 CheckExplicitlyDefaultedDefaultConstructor( 3739 cast<CXXConstructorDecl>(*MI)); 3740 break; 3741 3742 case CXXDestructor: 3743 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3744 break; 3745 3746 case CXXCopyConstructor: 3747 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3748 break; 3749 3750 case CXXCopyAssignment: 3751 CheckExplicitlyDefaultedCopyAssignment(*MI); 3752 break; 3753 3754 case CXXMoveConstructor: 3755 CheckExplicitlyDefaultedMoveConstructor(cast<CXXConstructorDecl>(*MI)); 3756 break; 3757 3758 case CXXMoveAssignment: 3759 CheckExplicitlyDefaultedMoveAssignment(*MI); 3760 break; 3761 3762 case CXXInvalid: 3763 llvm_unreachable("non-special member explicitly defaulted!"); 3764 } 3765 } 3766 } 3767 3768} 3769 3770void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3771 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3772 3773 // Whether this was the first-declared instance of the constructor. 3774 // This affects whether we implicitly add an exception spec (and, eventually, 3775 // constexpr). It is also ill-formed to explicitly default a constructor such 3776 // that it would be deleted. (C++0x [decl.fct.def.default]) 3777 bool First = CD == CD->getCanonicalDecl(); 3778 3779 bool HadError = false; 3780 if (CD->getNumParams() != 0) { 3781 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3782 << CD->getSourceRange(); 3783 HadError = true; 3784 } 3785 3786 ImplicitExceptionSpecification Spec 3787 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3788 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3789 if (EPI.ExceptionSpecType == EST_Delayed) { 3790 // Exception specification depends on some deferred part of the class. We'll 3791 // try again when the class's definition has been fully processed. 3792 return; 3793 } 3794 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3795 *ExceptionType = Context.getFunctionType( 3796 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3797 3798 // C++11 [dcl.fct.def.default]p2: 3799 // An explicitly-defaulted function may be declared constexpr only if it 3800 // would have been implicitly declared as constexpr, 3801 if (CD->isConstexpr()) { 3802 if (!CD->getParent()->defaultedDefaultConstructorIsConstexpr()) { 3803 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3804 << CXXDefaultConstructor; 3805 HadError = true; 3806 } 3807 } 3808 // and may have an explicit exception-specification only if it is compatible 3809 // with the exception-specification on the implicit declaration. 3810 if (CtorType->hasExceptionSpec()) { 3811 if (CheckEquivalentExceptionSpec( 3812 PDiag(diag::err_incorrect_defaulted_exception_spec) 3813 << CXXDefaultConstructor, 3814 PDiag(), 3815 ExceptionType, SourceLocation(), 3816 CtorType, CD->getLocation())) { 3817 HadError = true; 3818 } 3819 } 3820 3821 // If a function is explicitly defaulted on its first declaration, 3822 if (First) { 3823 // -- it is implicitly considered to be constexpr if the implicit 3824 // definition would be, 3825 CD->setConstexpr(CD->getParent()->defaultedDefaultConstructorIsConstexpr()); 3826 3827 // -- it is implicitly considered to have the same 3828 // exception-specification as if it had been implicitly declared 3829 // 3830 // FIXME: a compatible, but different, explicit exception specification 3831 // will be silently overridden. We should issue a warning if this happens. 3832 EPI.ExtInfo = CtorType->getExtInfo(); 3833 } 3834 3835 if (HadError) { 3836 CD->setInvalidDecl(); 3837 return; 3838 } 3839 3840 if (ShouldDeleteSpecialMember(CD, CXXDefaultConstructor)) { 3841 if (First) { 3842 CD->setDeletedAsWritten(); 3843 } else { 3844 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3845 << CXXDefaultConstructor; 3846 CD->setInvalidDecl(); 3847 } 3848 } 3849} 3850 3851void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3852 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3853 3854 // Whether this was the first-declared instance of the constructor. 3855 bool First = CD == CD->getCanonicalDecl(); 3856 3857 bool HadError = false; 3858 if (CD->getNumParams() != 1) { 3859 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3860 << CD->getSourceRange(); 3861 HadError = true; 3862 } 3863 3864 ImplicitExceptionSpecification Spec(Context); 3865 bool Const; 3866 llvm::tie(Spec, Const) = 3867 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3868 3869 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3870 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3871 *ExceptionType = Context.getFunctionType( 3872 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3873 3874 // Check for parameter type matching. 3875 // This is a copy ctor so we know it's a cv-qualified reference to T. 3876 QualType ArgType = CtorType->getArgType(0); 3877 if (ArgType->getPointeeType().isVolatileQualified()) { 3878 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3879 HadError = true; 3880 } 3881 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3882 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3883 HadError = true; 3884 } 3885 3886 // C++11 [dcl.fct.def.default]p2: 3887 // An explicitly-defaulted function may be declared constexpr only if it 3888 // would have been implicitly declared as constexpr, 3889 if (CD->isConstexpr()) { 3890 if (!CD->getParent()->defaultedCopyConstructorIsConstexpr()) { 3891 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3892 << CXXCopyConstructor; 3893 HadError = true; 3894 } 3895 } 3896 // and may have an explicit exception-specification only if it is compatible 3897 // with the exception-specification on the implicit declaration. 3898 if (CtorType->hasExceptionSpec()) { 3899 if (CheckEquivalentExceptionSpec( 3900 PDiag(diag::err_incorrect_defaulted_exception_spec) 3901 << CXXCopyConstructor, 3902 PDiag(), 3903 ExceptionType, SourceLocation(), 3904 CtorType, CD->getLocation())) { 3905 HadError = true; 3906 } 3907 } 3908 3909 // If a function is explicitly defaulted on its first declaration, 3910 if (First) { 3911 // -- it is implicitly considered to be constexpr if the implicit 3912 // definition would be, 3913 CD->setConstexpr(CD->getParent()->defaultedCopyConstructorIsConstexpr()); 3914 3915 // -- it is implicitly considered to have the same 3916 // exception-specification as if it had been implicitly declared, and 3917 // 3918 // FIXME: a compatible, but different, explicit exception specification 3919 // will be silently overridden. We should issue a warning if this happens. 3920 EPI.ExtInfo = CtorType->getExtInfo(); 3921 3922 // -- [...] it shall have the same parameter type as if it had been 3923 // implicitly declared. 3924 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3925 } 3926 3927 if (HadError) { 3928 CD->setInvalidDecl(); 3929 return; 3930 } 3931 3932 if (ShouldDeleteSpecialMember(CD, CXXCopyConstructor)) { 3933 if (First) { 3934 CD->setDeletedAsWritten(); 3935 } else { 3936 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3937 << CXXCopyConstructor; 3938 CD->setInvalidDecl(); 3939 } 3940 } 3941} 3942 3943void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3944 assert(MD->isExplicitlyDefaulted()); 3945 3946 // Whether this was the first-declared instance of the operator 3947 bool First = MD == MD->getCanonicalDecl(); 3948 3949 bool HadError = false; 3950 if (MD->getNumParams() != 1) { 3951 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3952 << MD->getSourceRange(); 3953 HadError = true; 3954 } 3955 3956 QualType ReturnType = 3957 MD->getType()->getAs<FunctionType>()->getResultType(); 3958 if (!ReturnType->isLValueReferenceType() || 3959 !Context.hasSameType( 3960 Context.getCanonicalType(ReturnType->getPointeeType()), 3961 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3962 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3963 HadError = true; 3964 } 3965 3966 ImplicitExceptionSpecification Spec(Context); 3967 bool Const; 3968 llvm::tie(Spec, Const) = 3969 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 3970 3971 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3972 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3973 *ExceptionType = Context.getFunctionType( 3974 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3975 3976 QualType ArgType = OperType->getArgType(0); 3977 if (!ArgType->isLValueReferenceType()) { 3978 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 3979 HadError = true; 3980 } else { 3981 if (ArgType->getPointeeType().isVolatileQualified()) { 3982 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 3983 HadError = true; 3984 } 3985 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3986 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 3987 HadError = true; 3988 } 3989 } 3990 3991 if (OperType->getTypeQuals()) { 3992 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 3993 HadError = true; 3994 } 3995 3996 if (OperType->hasExceptionSpec()) { 3997 if (CheckEquivalentExceptionSpec( 3998 PDiag(diag::err_incorrect_defaulted_exception_spec) 3999 << CXXCopyAssignment, 4000 PDiag(), 4001 ExceptionType, SourceLocation(), 4002 OperType, MD->getLocation())) { 4003 HadError = true; 4004 } 4005 } 4006 if (First) { 4007 // We set the declaration to have the computed exception spec here. 4008 // We duplicate the one parameter type. 4009 EPI.RefQualifier = OperType->getRefQualifier(); 4010 EPI.ExtInfo = OperType->getExtInfo(); 4011 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4012 } 4013 4014 if (HadError) { 4015 MD->setInvalidDecl(); 4016 return; 4017 } 4018 4019 if (ShouldDeleteCopyAssignmentOperator(MD)) { 4020 if (First) { 4021 MD->setDeletedAsWritten(); 4022 } else { 4023 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4024 << CXXCopyAssignment; 4025 MD->setInvalidDecl(); 4026 } 4027 } 4028} 4029 4030void Sema::CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *CD) { 4031 assert(CD->isExplicitlyDefaulted() && CD->isMoveConstructor()); 4032 4033 // Whether this was the first-declared instance of the constructor. 4034 bool First = CD == CD->getCanonicalDecl(); 4035 4036 bool HadError = false; 4037 if (CD->getNumParams() != 1) { 4038 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_params) 4039 << CD->getSourceRange(); 4040 HadError = true; 4041 } 4042 4043 ImplicitExceptionSpecification Spec( 4044 ComputeDefaultedMoveCtorExceptionSpec(CD->getParent())); 4045 4046 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4047 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 4048 *ExceptionType = Context.getFunctionType( 4049 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4050 4051 // Check for parameter type matching. 4052 // This is a move ctor so we know it's a cv-qualified rvalue reference to T. 4053 QualType ArgType = CtorType->getArgType(0); 4054 if (ArgType->getPointeeType().isVolatileQualified()) { 4055 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_volatile_param); 4056 HadError = true; 4057 } 4058 if (ArgType->getPointeeType().isConstQualified()) { 4059 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_const_param); 4060 HadError = true; 4061 } 4062 4063 // C++11 [dcl.fct.def.default]p2: 4064 // An explicitly-defaulted function may be declared constexpr only if it 4065 // would have been implicitly declared as constexpr, 4066 if (CD->isConstexpr()) { 4067 if (!CD->getParent()->defaultedMoveConstructorIsConstexpr()) { 4068 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 4069 << CXXMoveConstructor; 4070 HadError = true; 4071 } 4072 } 4073 // and may have an explicit exception-specification only if it is compatible 4074 // with the exception-specification on the implicit declaration. 4075 if (CtorType->hasExceptionSpec()) { 4076 if (CheckEquivalentExceptionSpec( 4077 PDiag(diag::err_incorrect_defaulted_exception_spec) 4078 << CXXMoveConstructor, 4079 PDiag(), 4080 ExceptionType, SourceLocation(), 4081 CtorType, CD->getLocation())) { 4082 HadError = true; 4083 } 4084 } 4085 4086 // If a function is explicitly defaulted on its first declaration, 4087 if (First) { 4088 // -- it is implicitly considered to be constexpr if the implicit 4089 // definition would be, 4090 CD->setConstexpr(CD->getParent()->defaultedMoveConstructorIsConstexpr()); 4091 4092 // -- it is implicitly considered to have the same 4093 // exception-specification as if it had been implicitly declared, and 4094 // 4095 // FIXME: a compatible, but different, explicit exception specification 4096 // will be silently overridden. We should issue a warning if this happens. 4097 EPI.ExtInfo = CtorType->getExtInfo(); 4098 4099 // -- [...] it shall have the same parameter type as if it had been 4100 // implicitly declared. 4101 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 4102 } 4103 4104 if (HadError) { 4105 CD->setInvalidDecl(); 4106 return; 4107 } 4108 4109 if (ShouldDeleteSpecialMember(CD, CXXMoveConstructor)) { 4110 if (First) { 4111 CD->setDeletedAsWritten(); 4112 } else { 4113 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 4114 << CXXMoveConstructor; 4115 CD->setInvalidDecl(); 4116 } 4117 } 4118} 4119 4120void Sema::CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *MD) { 4121 assert(MD->isExplicitlyDefaulted()); 4122 4123 // Whether this was the first-declared instance of the operator 4124 bool First = MD == MD->getCanonicalDecl(); 4125 4126 bool HadError = false; 4127 if (MD->getNumParams() != 1) { 4128 Diag(MD->getLocation(), diag::err_defaulted_move_assign_params) 4129 << MD->getSourceRange(); 4130 HadError = true; 4131 } 4132 4133 QualType ReturnType = 4134 MD->getType()->getAs<FunctionType>()->getResultType(); 4135 if (!ReturnType->isLValueReferenceType() || 4136 !Context.hasSameType( 4137 Context.getCanonicalType(ReturnType->getPointeeType()), 4138 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 4139 Diag(MD->getLocation(), diag::err_defaulted_move_assign_return_type); 4140 HadError = true; 4141 } 4142 4143 ImplicitExceptionSpecification Spec( 4144 ComputeDefaultedMoveCtorExceptionSpec(MD->getParent())); 4145 4146 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4147 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4148 *ExceptionType = Context.getFunctionType( 4149 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4150 4151 QualType ArgType = OperType->getArgType(0); 4152 if (!ArgType->isRValueReferenceType()) { 4153 Diag(MD->getLocation(), diag::err_defaulted_move_assign_not_ref); 4154 HadError = true; 4155 } else { 4156 if (ArgType->getPointeeType().isVolatileQualified()) { 4157 Diag(MD->getLocation(), diag::err_defaulted_move_assign_volatile_param); 4158 HadError = true; 4159 } 4160 if (ArgType->getPointeeType().isConstQualified()) { 4161 Diag(MD->getLocation(), diag::err_defaulted_move_assign_const_param); 4162 HadError = true; 4163 } 4164 } 4165 4166 if (OperType->getTypeQuals()) { 4167 Diag(MD->getLocation(), diag::err_defaulted_move_assign_quals); 4168 HadError = true; 4169 } 4170 4171 if (OperType->hasExceptionSpec()) { 4172 if (CheckEquivalentExceptionSpec( 4173 PDiag(diag::err_incorrect_defaulted_exception_spec) 4174 << CXXMoveAssignment, 4175 PDiag(), 4176 ExceptionType, SourceLocation(), 4177 OperType, MD->getLocation())) { 4178 HadError = true; 4179 } 4180 } 4181 if (First) { 4182 // We set the declaration to have the computed exception spec here. 4183 // We duplicate the one parameter type. 4184 EPI.RefQualifier = OperType->getRefQualifier(); 4185 EPI.ExtInfo = OperType->getExtInfo(); 4186 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4187 } 4188 4189 if (HadError) { 4190 MD->setInvalidDecl(); 4191 return; 4192 } 4193 4194 if (ShouldDeleteMoveAssignmentOperator(MD)) { 4195 if (First) { 4196 MD->setDeletedAsWritten(); 4197 } else { 4198 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4199 << CXXMoveAssignment; 4200 MD->setInvalidDecl(); 4201 } 4202 } 4203} 4204 4205void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 4206 assert(DD->isExplicitlyDefaulted()); 4207 4208 // Whether this was the first-declared instance of the destructor. 4209 bool First = DD == DD->getCanonicalDecl(); 4210 4211 ImplicitExceptionSpecification Spec 4212 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 4213 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4214 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 4215 *ExceptionType = Context.getFunctionType( 4216 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4217 4218 if (DtorType->hasExceptionSpec()) { 4219 if (CheckEquivalentExceptionSpec( 4220 PDiag(diag::err_incorrect_defaulted_exception_spec) 4221 << CXXDestructor, 4222 PDiag(), 4223 ExceptionType, SourceLocation(), 4224 DtorType, DD->getLocation())) { 4225 DD->setInvalidDecl(); 4226 return; 4227 } 4228 } 4229 if (First) { 4230 // We set the declaration to have the computed exception spec here. 4231 // There are no parameters. 4232 EPI.ExtInfo = DtorType->getExtInfo(); 4233 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 4234 } 4235 4236 if (ShouldDeleteDestructor(DD)) { 4237 if (First) { 4238 DD->setDeletedAsWritten(); 4239 } else { 4240 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 4241 << CXXDestructor; 4242 DD->setInvalidDecl(); 4243 } 4244 } 4245} 4246 4247/// This function implements the following C++0x paragraphs: 4248/// - [class.ctor]/5 4249/// - [class.copy]/11 4250bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM) { 4251 assert(!MD->isInvalidDecl()); 4252 CXXRecordDecl *RD = MD->getParent(); 4253 assert(!RD->isDependentType() && "do deletion after instantiation"); 4254 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4255 return false; 4256 4257 bool IsUnion = RD->isUnion(); 4258 bool IsConstructor = false; 4259 bool IsAssignment = false; 4260 bool IsMove = false; 4261 4262 bool ConstArg = false; 4263 4264 switch (CSM) { 4265 case CXXDefaultConstructor: 4266 IsConstructor = true; 4267 break; 4268 case CXXCopyConstructor: 4269 IsConstructor = true; 4270 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4271 break; 4272 case CXXMoveConstructor: 4273 IsConstructor = true; 4274 IsMove = true; 4275 break; 4276 default: 4277 llvm_unreachable("function only currently implemented for default ctors"); 4278 } 4279 4280 SourceLocation Loc = MD->getLocation(); 4281 4282 // Do access control from the special member function 4283 ContextRAII MethodContext(*this, MD); 4284 4285 bool AllConst = true; 4286 4287 // We do this because we should never actually use an anonymous 4288 // union's constructor. 4289 if (IsUnion && RD->isAnonymousStructOrUnion()) 4290 return false; 4291 4292 // FIXME: We should put some diagnostic logic right into this function. 4293 4294 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4295 BE = RD->bases_end(); 4296 BI != BE; ++BI) { 4297 // We'll handle this one later 4298 if (BI->isVirtual()) 4299 continue; 4300 4301 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4302 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4303 4304 // Unless we have an assignment operator, the base's destructor must 4305 // be accessible and not deleted. 4306 if (!IsAssignment) { 4307 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4308 if (BaseDtor->isDeleted()) 4309 return true; 4310 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4311 AR_accessible) 4312 return true; 4313 } 4314 4315 // Finding the corresponding member in the base should lead to a 4316 // unique, accessible, non-deleted function. If we are doing 4317 // a destructor, we have already checked this case. 4318 if (CSM != CXXDestructor) { 4319 SpecialMemberOverloadResult *SMOR = 4320 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, false, false, 4321 false); 4322 if (!SMOR->hasSuccess()) 4323 return true; 4324 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4325 if (IsConstructor) { 4326 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4327 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4328 PDiag()) != AR_accessible) 4329 return true; 4330 4331 // For a move operation, the corresponding operation must actually 4332 // be a move operation (and not a copy selected by overload 4333 // resolution) unless we are working on a trivially copyable class. 4334 if (IsMove && !BaseCtor->isMoveConstructor() && 4335 !BaseDecl->isTriviallyCopyable()) 4336 return true; 4337 } 4338 } 4339 } 4340 4341 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4342 BE = RD->vbases_end(); 4343 BI != BE; ++BI) { 4344 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4345 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4346 4347 // Unless we have an assignment operator, the base's destructor must 4348 // be accessible and not deleted. 4349 if (!IsAssignment) { 4350 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4351 if (BaseDtor->isDeleted()) 4352 return true; 4353 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4354 AR_accessible) 4355 return true; 4356 } 4357 4358 // Finding the corresponding member in the base should lead to a 4359 // unique, accessible, non-deleted function. 4360 if (CSM != CXXDestructor) { 4361 SpecialMemberOverloadResult *SMOR = 4362 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, false, false, 4363 false); 4364 if (!SMOR->hasSuccess()) 4365 return true; 4366 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4367 if (IsConstructor) { 4368 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4369 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4370 PDiag()) != AR_accessible) 4371 return true; 4372 4373 // For a move operation, the corresponding operation must actually 4374 // be a move operation (and not a copy selected by overload 4375 // resolution) unless we are working on a trivially copyable class. 4376 if (IsMove && !BaseCtor->isMoveConstructor() && 4377 !BaseDecl->isTriviallyCopyable()) 4378 return true; 4379 } 4380 } 4381 } 4382 4383 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4384 FE = RD->field_end(); 4385 FI != FE; ++FI) { 4386 if (FI->isInvalidDecl() || FI->isUnnamedBitfield()) 4387 continue; 4388 4389 QualType FieldType = Context.getBaseElementType(FI->getType()); 4390 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4391 4392 // For a default constructor, all references must be initialized in-class 4393 // and, if a union, it must have a non-const member. 4394 if (CSM == CXXDefaultConstructor) { 4395 if (FieldType->isReferenceType() && !FI->hasInClassInitializer()) 4396 return true; 4397 4398 if (IsUnion && !FieldType.isConstQualified()) 4399 AllConst = false; 4400 // For a copy constructor, data members must not be of rvalue reference 4401 // type. 4402 } else if (CSM == CXXCopyConstructor) { 4403 if (FieldType->isRValueReferenceType()) 4404 return true; 4405 } 4406 4407 if (FieldRecord) { 4408 // For a default constructor, a const member must have a user-provided 4409 // default constructor or else be explicitly initialized. 4410 if (CSM == CXXDefaultConstructor && FieldType.isConstQualified() && 4411 !FI->hasInClassInitializer() && 4412 !FieldRecord->hasUserProvidedDefaultConstructor()) 4413 return true; 4414 4415 // Some additional restrictions exist on the variant members. 4416 if (!IsUnion && FieldRecord->isUnion() && 4417 FieldRecord->isAnonymousStructOrUnion()) { 4418 // We're okay to reuse AllConst here since we only care about the 4419 // value otherwise if we're in a union. 4420 AllConst = true; 4421 4422 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4423 UE = FieldRecord->field_end(); 4424 UI != UE; ++UI) { 4425 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4426 CXXRecordDecl *UnionFieldRecord = 4427 UnionFieldType->getAsCXXRecordDecl(); 4428 4429 if (!UnionFieldType.isConstQualified()) 4430 AllConst = false; 4431 4432 if (UnionFieldRecord) { 4433 // FIXME: Checking for accessibility and validity of this 4434 // destructor is technically going beyond the 4435 // standard, but this is believed to be a defect. 4436 if (!IsAssignment) { 4437 CXXDestructorDecl *FieldDtor = LookupDestructor(UnionFieldRecord); 4438 if (FieldDtor->isDeleted()) 4439 return true; 4440 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4441 AR_accessible) 4442 return true; 4443 if (!FieldDtor->isTrivial()) 4444 return true; 4445 } 4446 4447 if (CSM != CXXDestructor) { 4448 SpecialMemberOverloadResult *SMOR = 4449 LookupSpecialMember(UnionFieldRecord, CSM, ConstArg, false, 4450 false, false, false); 4451 // FIXME: Checking for accessibility and validity of this 4452 // corresponding member is technically going beyond the 4453 // standard, but this is believed to be a defect. 4454 if (!SMOR->hasSuccess()) 4455 return true; 4456 4457 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4458 // A member of a union must have a trivial corresponding 4459 // constructor. 4460 if (!FieldMember->isTrivial()) 4461 return true; 4462 4463 if (IsConstructor) { 4464 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4465 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4466 PDiag()) != AR_accessible) 4467 return true; 4468 } 4469 } 4470 } 4471 } 4472 4473 // At least one member in each anonymous union must be non-const 4474 if (CSM == CXXDefaultConstructor && AllConst) 4475 return true; 4476 4477 // Don't try to initialize the anonymous union 4478 // This is technically non-conformant, but sanity demands it. 4479 continue; 4480 } 4481 4482 // Unless we're doing assignment, the field's destructor must be 4483 // accessible and not deleted. 4484 if (!IsAssignment) { 4485 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4486 if (FieldDtor->isDeleted()) 4487 return true; 4488 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4489 AR_accessible) 4490 return true; 4491 } 4492 4493 // Check that the corresponding member of the field is accessible, 4494 // unique, and non-deleted. We don't do this if it has an explicit 4495 // initialization when default-constructing. 4496 if (CSM != CXXDestructor && 4497 (CSM != CXXDefaultConstructor || !FI->hasInClassInitializer())) { 4498 SpecialMemberOverloadResult *SMOR = 4499 LookupSpecialMember(FieldRecord, CSM, ConstArg, false, false, false, 4500 false); 4501 if (!SMOR->hasSuccess()) 4502 return true; 4503 4504 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4505 if (IsConstructor) { 4506 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4507 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4508 PDiag()) != AR_accessible) 4509 return true; 4510 4511 // For a move operation, the corresponding operation must actually 4512 // be a move operation (and not a copy selected by overload 4513 // resolution) unless we are working on a trivially copyable class. 4514 if (IsMove && !FieldCtor->isMoveConstructor() && 4515 !FieldRecord->isTriviallyCopyable()) 4516 return true; 4517 } 4518 4519 // We need the corresponding member of a union to be trivial so that 4520 // we can safely copy them all simultaneously. 4521 // FIXME: Note that performing the check here (where we rely on the lack 4522 // of an in-class initializer) is technically ill-formed. However, this 4523 // seems most obviously to be a bug in the standard. 4524 if (IsUnion && !FieldMember->isTrivial()) 4525 return true; 4526 } 4527 } else if (CSM == CXXDefaultConstructor && !IsUnion && 4528 FieldType.isConstQualified() && !FI->hasInClassInitializer()) { 4529 // We can't initialize a const member of non-class type to any value. 4530 return true; 4531 } 4532 } 4533 4534 // We can't have all const members in a union when default-constructing, 4535 // or else they're all nonsensical garbage values that can't be changed. 4536 if (CSM == CXXDefaultConstructor && IsUnion && AllConst) 4537 return true; 4538 4539 return false; 4540} 4541 4542bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) { 4543 CXXRecordDecl *RD = MD->getParent(); 4544 assert(!RD->isDependentType() && "do deletion after instantiation"); 4545 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4546 return false; 4547 4548 SourceLocation Loc = MD->getLocation(); 4549 4550 // Do access control from the constructor 4551 ContextRAII MethodContext(*this, MD); 4552 4553 bool Union = RD->isUnion(); 4554 4555 unsigned ArgQuals = 4556 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 4557 Qualifiers::Const : 0; 4558 4559 // We do this because we should never actually use an anonymous 4560 // union's constructor. 4561 if (Union && RD->isAnonymousStructOrUnion()) 4562 return false; 4563 4564 // FIXME: We should put some diagnostic logic right into this function. 4565 4566 // C++0x [class.copy]/20 4567 // A defaulted [copy] assignment operator for class X is defined as deleted 4568 // if X has: 4569 4570 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4571 BE = RD->bases_end(); 4572 BI != BE; ++BI) { 4573 // We'll handle this one later 4574 if (BI->isVirtual()) 4575 continue; 4576 4577 QualType BaseType = BI->getType(); 4578 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4579 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4580 4581 // -- a [direct base class] B that cannot be [copied] because overload 4582 // resolution, as applied to B's [copy] assignment operator, results in 4583 // an ambiguity or a function that is deleted or inaccessible from the 4584 // assignment operator 4585 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4586 0); 4587 if (!CopyOper || CopyOper->isDeleted()) 4588 return true; 4589 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4590 return true; 4591 } 4592 4593 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4594 BE = RD->vbases_end(); 4595 BI != BE; ++BI) { 4596 QualType BaseType = BI->getType(); 4597 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4598 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4599 4600 // -- a [virtual base class] B that cannot be [copied] because overload 4601 // resolution, as applied to B's [copy] assignment operator, results in 4602 // an ambiguity or a function that is deleted or inaccessible from the 4603 // assignment operator 4604 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4605 0); 4606 if (!CopyOper || CopyOper->isDeleted()) 4607 return true; 4608 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4609 return true; 4610 } 4611 4612 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4613 FE = RD->field_end(); 4614 FI != FE; ++FI) { 4615 if (FI->isUnnamedBitfield()) 4616 continue; 4617 4618 QualType FieldType = Context.getBaseElementType(FI->getType()); 4619 4620 // -- a non-static data member of reference type 4621 if (FieldType->isReferenceType()) 4622 return true; 4623 4624 // -- a non-static data member of const non-class type (or array thereof) 4625 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4626 return true; 4627 4628 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4629 4630 if (FieldRecord) { 4631 // This is an anonymous union 4632 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4633 // Anonymous unions inside unions do not variant members create 4634 if (!Union) { 4635 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4636 UE = FieldRecord->field_end(); 4637 UI != UE; ++UI) { 4638 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4639 CXXRecordDecl *UnionFieldRecord = 4640 UnionFieldType->getAsCXXRecordDecl(); 4641 4642 // -- a variant member with a non-trivial [copy] assignment operator 4643 // and X is a union-like class 4644 if (UnionFieldRecord && 4645 !UnionFieldRecord->hasTrivialCopyAssignment()) 4646 return true; 4647 } 4648 } 4649 4650 // Don't try to initalize an anonymous union 4651 continue; 4652 // -- a variant member with a non-trivial [copy] assignment operator 4653 // and X is a union-like class 4654 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 4655 return true; 4656 } 4657 4658 CXXMethodDecl *CopyOper = LookupCopyingAssignment(FieldRecord, ArgQuals, 4659 false, 0); 4660 if (!CopyOper || CopyOper->isDeleted()) 4661 return true; 4662 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4663 return true; 4664 } 4665 } 4666 4667 return false; 4668} 4669 4670bool Sema::ShouldDeleteMoveAssignmentOperator(CXXMethodDecl *MD) { 4671 CXXRecordDecl *RD = MD->getParent(); 4672 assert(!RD->isDependentType() && "do deletion after instantiation"); 4673 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4674 return false; 4675 4676 SourceLocation Loc = MD->getLocation(); 4677 4678 // Do access control from the constructor 4679 ContextRAII MethodContext(*this, MD); 4680 4681 bool Union = RD->isUnion(); 4682 4683 // We do this because we should never actually use an anonymous 4684 // union's constructor. 4685 if (Union && RD->isAnonymousStructOrUnion()) 4686 return false; 4687 4688 // C++0x [class.copy]/20 4689 // A defaulted [move] assignment operator for class X is defined as deleted 4690 // if X has: 4691 4692 // -- for the move constructor, [...] any direct or indirect virtual base 4693 // class. 4694 if (RD->getNumVBases() != 0) 4695 return true; 4696 4697 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4698 BE = RD->bases_end(); 4699 BI != BE; ++BI) { 4700 4701 QualType BaseType = BI->getType(); 4702 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4703 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4704 4705 // -- a [direct base class] B that cannot be [moved] because overload 4706 // resolution, as applied to B's [move] assignment operator, results in 4707 // an ambiguity or a function that is deleted or inaccessible from the 4708 // assignment operator 4709 CXXMethodDecl *MoveOper = LookupMovingAssignment(BaseDecl, false, 0); 4710 if (!MoveOper || MoveOper->isDeleted()) 4711 return true; 4712 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4713 return true; 4714 4715 // -- for the move assignment operator, a [direct base class] with a type 4716 // that does not have a move assignment operator and is not trivially 4717 // copyable. 4718 if (!MoveOper->isMoveAssignmentOperator() && 4719 !BaseDecl->isTriviallyCopyable()) 4720 return true; 4721 } 4722 4723 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4724 FE = RD->field_end(); 4725 FI != FE; ++FI) { 4726 if (FI->isUnnamedBitfield()) 4727 continue; 4728 4729 QualType FieldType = Context.getBaseElementType(FI->getType()); 4730 4731 // -- a non-static data member of reference type 4732 if (FieldType->isReferenceType()) 4733 return true; 4734 4735 // -- a non-static data member of const non-class type (or array thereof) 4736 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4737 return true; 4738 4739 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4740 4741 if (FieldRecord) { 4742 // This is an anonymous union 4743 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4744 // Anonymous unions inside unions do not variant members create 4745 if (!Union) { 4746 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4747 UE = FieldRecord->field_end(); 4748 UI != UE; ++UI) { 4749 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4750 CXXRecordDecl *UnionFieldRecord = 4751 UnionFieldType->getAsCXXRecordDecl(); 4752 4753 // -- a variant member with a non-trivial [move] assignment operator 4754 // and X is a union-like class 4755 if (UnionFieldRecord && 4756 !UnionFieldRecord->hasTrivialMoveAssignment()) 4757 return true; 4758 } 4759 } 4760 4761 // Don't try to initalize an anonymous union 4762 continue; 4763 // -- a variant member with a non-trivial [move] assignment operator 4764 // and X is a union-like class 4765 } else if (Union && !FieldRecord->hasTrivialMoveAssignment()) { 4766 return true; 4767 } 4768 4769 CXXMethodDecl *MoveOper = LookupMovingAssignment(FieldRecord, false, 0); 4770 if (!MoveOper || MoveOper->isDeleted()) 4771 return true; 4772 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4773 return true; 4774 4775 // -- for the move assignment operator, a [non-static data member] with a 4776 // type that does not have a move assignment operator and is not 4777 // trivially copyable. 4778 if (!MoveOper->isMoveAssignmentOperator() && 4779 !FieldRecord->isTriviallyCopyable()) 4780 return true; 4781 } 4782 } 4783 4784 return false; 4785} 4786 4787bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 4788 CXXRecordDecl *RD = DD->getParent(); 4789 assert(!RD->isDependentType() && "do deletion after instantiation"); 4790 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4791 return false; 4792 4793 SourceLocation Loc = DD->getLocation(); 4794 4795 // Do access control from the destructor 4796 ContextRAII CtorContext(*this, DD); 4797 4798 bool Union = RD->isUnion(); 4799 4800 // We do this because we should never actually use an anonymous 4801 // union's destructor. 4802 if (Union && RD->isAnonymousStructOrUnion()) 4803 return false; 4804 4805 // C++0x [class.dtor]p5 4806 // A defaulted destructor for a class X is defined as deleted if: 4807 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4808 BE = RD->bases_end(); 4809 BI != BE; ++BI) { 4810 // We'll handle this one later 4811 if (BI->isVirtual()) 4812 continue; 4813 4814 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4815 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4816 assert(BaseDtor && "base has no destructor"); 4817 4818 // -- any direct or virtual base class has a deleted destructor or 4819 // a destructor that is inaccessible from the defaulted destructor 4820 if (BaseDtor->isDeleted()) 4821 return true; 4822 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4823 AR_accessible) 4824 return true; 4825 } 4826 4827 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4828 BE = RD->vbases_end(); 4829 BI != BE; ++BI) { 4830 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4831 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4832 assert(BaseDtor && "base has no destructor"); 4833 4834 // -- any direct or virtual base class has a deleted destructor or 4835 // a destructor that is inaccessible from the defaulted destructor 4836 if (BaseDtor->isDeleted()) 4837 return true; 4838 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4839 AR_accessible) 4840 return true; 4841 } 4842 4843 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4844 FE = RD->field_end(); 4845 FI != FE; ++FI) { 4846 QualType FieldType = Context.getBaseElementType(FI->getType()); 4847 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4848 if (FieldRecord) { 4849 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4850 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4851 UE = FieldRecord->field_end(); 4852 UI != UE; ++UI) { 4853 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 4854 CXXRecordDecl *UnionFieldRecord = 4855 UnionFieldType->getAsCXXRecordDecl(); 4856 4857 // -- X is a union-like class that has a variant member with a non- 4858 // trivial destructor. 4859 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 4860 return true; 4861 } 4862 // Technically we are supposed to do this next check unconditionally. 4863 // But that makes absolutely no sense. 4864 } else { 4865 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4866 4867 // -- any of the non-static data members has class type M (or array 4868 // thereof) and M has a deleted destructor or a destructor that is 4869 // inaccessible from the defaulted destructor 4870 if (FieldDtor->isDeleted()) 4871 return true; 4872 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4873 AR_accessible) 4874 return true; 4875 4876 // -- X is a union-like class that has a variant member with a non- 4877 // trivial destructor. 4878 if (Union && !FieldDtor->isTrivial()) 4879 return true; 4880 } 4881 } 4882 } 4883 4884 if (DD->isVirtual()) { 4885 FunctionDecl *OperatorDelete = 0; 4886 DeclarationName Name = 4887 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4888 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete, 4889 false)) 4890 return true; 4891 } 4892 4893 4894 return false; 4895} 4896 4897/// \brief Data used with FindHiddenVirtualMethod 4898namespace { 4899 struct FindHiddenVirtualMethodData { 4900 Sema *S; 4901 CXXMethodDecl *Method; 4902 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4903 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4904 }; 4905} 4906 4907/// \brief Member lookup function that determines whether a given C++ 4908/// method overloads virtual methods in a base class without overriding any, 4909/// to be used with CXXRecordDecl::lookupInBases(). 4910static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4911 CXXBasePath &Path, 4912 void *UserData) { 4913 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4914 4915 FindHiddenVirtualMethodData &Data 4916 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4917 4918 DeclarationName Name = Data.Method->getDeclName(); 4919 assert(Name.getNameKind() == DeclarationName::Identifier); 4920 4921 bool foundSameNameMethod = false; 4922 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4923 for (Path.Decls = BaseRecord->lookup(Name); 4924 Path.Decls.first != Path.Decls.second; 4925 ++Path.Decls.first) { 4926 NamedDecl *D = *Path.Decls.first; 4927 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4928 MD = MD->getCanonicalDecl(); 4929 foundSameNameMethod = true; 4930 // Interested only in hidden virtual methods. 4931 if (!MD->isVirtual()) 4932 continue; 4933 // If the method we are checking overrides a method from its base 4934 // don't warn about the other overloaded methods. 4935 if (!Data.S->IsOverload(Data.Method, MD, false)) 4936 return true; 4937 // Collect the overload only if its hidden. 4938 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4939 overloadedMethods.push_back(MD); 4940 } 4941 } 4942 4943 if (foundSameNameMethod) 4944 Data.OverloadedMethods.append(overloadedMethods.begin(), 4945 overloadedMethods.end()); 4946 return foundSameNameMethod; 4947} 4948 4949/// \brief See if a method overloads virtual methods in a base class without 4950/// overriding any. 4951void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4952 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4953 MD->getLocation()) == DiagnosticsEngine::Ignored) 4954 return; 4955 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4956 return; 4957 4958 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4959 /*bool RecordPaths=*/false, 4960 /*bool DetectVirtual=*/false); 4961 FindHiddenVirtualMethodData Data; 4962 Data.Method = MD; 4963 Data.S = this; 4964 4965 // Keep the base methods that were overriden or introduced in the subclass 4966 // by 'using' in a set. A base method not in this set is hidden. 4967 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4968 res.first != res.second; ++res.first) { 4969 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4970 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4971 E = MD->end_overridden_methods(); 4972 I != E; ++I) 4973 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4974 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4975 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4976 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4977 } 4978 4979 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4980 !Data.OverloadedMethods.empty()) { 4981 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4982 << MD << (Data.OverloadedMethods.size() > 1); 4983 4984 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4985 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4986 Diag(overloadedMD->getLocation(), 4987 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4988 } 4989 } 4990} 4991 4992void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4993 Decl *TagDecl, 4994 SourceLocation LBrac, 4995 SourceLocation RBrac, 4996 AttributeList *AttrList) { 4997 if (!TagDecl) 4998 return; 4999 5000 AdjustDeclIfTemplate(TagDecl); 5001 5002 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 5003 // strict aliasing violation! 5004 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 5005 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 5006 5007 CheckCompletedCXXClass( 5008 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 5009} 5010 5011/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 5012/// special functions, such as the default constructor, copy 5013/// constructor, or destructor, to the given C++ class (C++ 5014/// [special]p1). This routine can only be executed just before the 5015/// definition of the class is complete. 5016void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 5017 if (!ClassDecl->hasUserDeclaredConstructor()) 5018 ++ASTContext::NumImplicitDefaultConstructors; 5019 5020 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 5021 ++ASTContext::NumImplicitCopyConstructors; 5022 5023 if (getLangOptions().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 5024 ++ASTContext::NumImplicitMoveConstructors; 5025 5026 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 5027 ++ASTContext::NumImplicitCopyAssignmentOperators; 5028 5029 // If we have a dynamic class, then the copy assignment operator may be 5030 // virtual, so we have to declare it immediately. This ensures that, e.g., 5031 // it shows up in the right place in the vtable and that we diagnose 5032 // problems with the implicit exception specification. 5033 if (ClassDecl->isDynamicClass()) 5034 DeclareImplicitCopyAssignment(ClassDecl); 5035 } 5036 5037 if (getLangOptions().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()){ 5038 ++ASTContext::NumImplicitMoveAssignmentOperators; 5039 5040 // Likewise for the move assignment operator. 5041 if (ClassDecl->isDynamicClass()) 5042 DeclareImplicitMoveAssignment(ClassDecl); 5043 } 5044 5045 if (!ClassDecl->hasUserDeclaredDestructor()) { 5046 ++ASTContext::NumImplicitDestructors; 5047 5048 // If we have a dynamic class, then the destructor may be virtual, so we 5049 // have to declare the destructor immediately. This ensures that, e.g., it 5050 // shows up in the right place in the vtable and that we diagnose problems 5051 // with the implicit exception specification. 5052 if (ClassDecl->isDynamicClass()) 5053 DeclareImplicitDestructor(ClassDecl); 5054 } 5055} 5056 5057void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 5058 if (!D) 5059 return; 5060 5061 int NumParamList = D->getNumTemplateParameterLists(); 5062 for (int i = 0; i < NumParamList; i++) { 5063 TemplateParameterList* Params = D->getTemplateParameterList(i); 5064 for (TemplateParameterList::iterator Param = Params->begin(), 5065 ParamEnd = Params->end(); 5066 Param != ParamEnd; ++Param) { 5067 NamedDecl *Named = cast<NamedDecl>(*Param); 5068 if (Named->getDeclName()) { 5069 S->AddDecl(Named); 5070 IdResolver.AddDecl(Named); 5071 } 5072 } 5073 } 5074} 5075 5076void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 5077 if (!D) 5078 return; 5079 5080 TemplateParameterList *Params = 0; 5081 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 5082 Params = Template->getTemplateParameters(); 5083 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 5084 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 5085 Params = PartialSpec->getTemplateParameters(); 5086 else 5087 return; 5088 5089 for (TemplateParameterList::iterator Param = Params->begin(), 5090 ParamEnd = Params->end(); 5091 Param != ParamEnd; ++Param) { 5092 NamedDecl *Named = cast<NamedDecl>(*Param); 5093 if (Named->getDeclName()) { 5094 S->AddDecl(Named); 5095 IdResolver.AddDecl(Named); 5096 } 5097 } 5098} 5099 5100void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5101 if (!RecordD) return; 5102 AdjustDeclIfTemplate(RecordD); 5103 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 5104 PushDeclContext(S, Record); 5105} 5106 5107void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5108 if (!RecordD) return; 5109 PopDeclContext(); 5110} 5111 5112/// ActOnStartDelayedCXXMethodDeclaration - We have completed 5113/// parsing a top-level (non-nested) C++ class, and we are now 5114/// parsing those parts of the given Method declaration that could 5115/// not be parsed earlier (C++ [class.mem]p2), such as default 5116/// arguments. This action should enter the scope of the given 5117/// Method declaration as if we had just parsed the qualified method 5118/// name. However, it should not bring the parameters into scope; 5119/// that will be performed by ActOnDelayedCXXMethodParameter. 5120void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5121} 5122 5123/// ActOnDelayedCXXMethodParameter - We've already started a delayed 5124/// C++ method declaration. We're (re-)introducing the given 5125/// function parameter into scope for use in parsing later parts of 5126/// the method declaration. For example, we could see an 5127/// ActOnParamDefaultArgument event for this parameter. 5128void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 5129 if (!ParamD) 5130 return; 5131 5132 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 5133 5134 // If this parameter has an unparsed default argument, clear it out 5135 // to make way for the parsed default argument. 5136 if (Param->hasUnparsedDefaultArg()) 5137 Param->setDefaultArg(0); 5138 5139 S->AddDecl(Param); 5140 if (Param->getDeclName()) 5141 IdResolver.AddDecl(Param); 5142} 5143 5144/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 5145/// processing the delayed method declaration for Method. The method 5146/// declaration is now considered finished. There may be a separate 5147/// ActOnStartOfFunctionDef action later (not necessarily 5148/// immediately!) for this method, if it was also defined inside the 5149/// class body. 5150void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5151 if (!MethodD) 5152 return; 5153 5154 AdjustDeclIfTemplate(MethodD); 5155 5156 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5157 5158 // Now that we have our default arguments, check the constructor 5159 // again. It could produce additional diagnostics or affect whether 5160 // the class has implicitly-declared destructors, among other 5161 // things. 5162 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5163 CheckConstructor(Constructor); 5164 5165 // Check the default arguments, which we may have added. 5166 if (!Method->isInvalidDecl()) 5167 CheckCXXDefaultArguments(Method); 5168} 5169 5170/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5171/// the well-formedness of the constructor declarator @p D with type @p 5172/// R. If there are any errors in the declarator, this routine will 5173/// emit diagnostics and set the invalid bit to true. In any case, the type 5174/// will be updated to reflect a well-formed type for the constructor and 5175/// returned. 5176QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5177 StorageClass &SC) { 5178 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5179 5180 // C++ [class.ctor]p3: 5181 // A constructor shall not be virtual (10.3) or static (9.4). A 5182 // constructor can be invoked for a const, volatile or const 5183 // volatile object. A constructor shall not be declared const, 5184 // volatile, or const volatile (9.3.2). 5185 if (isVirtual) { 5186 if (!D.isInvalidType()) 5187 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5188 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5189 << SourceRange(D.getIdentifierLoc()); 5190 D.setInvalidType(); 5191 } 5192 if (SC == SC_Static) { 5193 if (!D.isInvalidType()) 5194 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5195 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5196 << SourceRange(D.getIdentifierLoc()); 5197 D.setInvalidType(); 5198 SC = SC_None; 5199 } 5200 5201 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5202 if (FTI.TypeQuals != 0) { 5203 if (FTI.TypeQuals & Qualifiers::Const) 5204 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5205 << "const" << SourceRange(D.getIdentifierLoc()); 5206 if (FTI.TypeQuals & Qualifiers::Volatile) 5207 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5208 << "volatile" << SourceRange(D.getIdentifierLoc()); 5209 if (FTI.TypeQuals & Qualifiers::Restrict) 5210 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5211 << "restrict" << SourceRange(D.getIdentifierLoc()); 5212 D.setInvalidType(); 5213 } 5214 5215 // C++0x [class.ctor]p4: 5216 // A constructor shall not be declared with a ref-qualifier. 5217 if (FTI.hasRefQualifier()) { 5218 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5219 << FTI.RefQualifierIsLValueRef 5220 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5221 D.setInvalidType(); 5222 } 5223 5224 // Rebuild the function type "R" without any type qualifiers (in 5225 // case any of the errors above fired) and with "void" as the 5226 // return type, since constructors don't have return types. 5227 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5228 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5229 return R; 5230 5231 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5232 EPI.TypeQuals = 0; 5233 EPI.RefQualifier = RQ_None; 5234 5235 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5236 Proto->getNumArgs(), EPI); 5237} 5238 5239/// CheckConstructor - Checks a fully-formed constructor for 5240/// well-formedness, issuing any diagnostics required. Returns true if 5241/// the constructor declarator is invalid. 5242void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5243 CXXRecordDecl *ClassDecl 5244 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5245 if (!ClassDecl) 5246 return Constructor->setInvalidDecl(); 5247 5248 // C++ [class.copy]p3: 5249 // A declaration of a constructor for a class X is ill-formed if 5250 // its first parameter is of type (optionally cv-qualified) X and 5251 // either there are no other parameters or else all other 5252 // parameters have default arguments. 5253 if (!Constructor->isInvalidDecl() && 5254 ((Constructor->getNumParams() == 1) || 5255 (Constructor->getNumParams() > 1 && 5256 Constructor->getParamDecl(1)->hasDefaultArg())) && 5257 Constructor->getTemplateSpecializationKind() 5258 != TSK_ImplicitInstantiation) { 5259 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5260 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5261 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5262 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5263 const char *ConstRef 5264 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5265 : " const &"; 5266 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5267 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5268 5269 // FIXME: Rather that making the constructor invalid, we should endeavor 5270 // to fix the type. 5271 Constructor->setInvalidDecl(); 5272 } 5273 } 5274} 5275 5276/// CheckDestructor - Checks a fully-formed destructor definition for 5277/// well-formedness, issuing any diagnostics required. Returns true 5278/// on error. 5279bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5280 CXXRecordDecl *RD = Destructor->getParent(); 5281 5282 if (Destructor->isVirtual()) { 5283 SourceLocation Loc; 5284 5285 if (!Destructor->isImplicit()) 5286 Loc = Destructor->getLocation(); 5287 else 5288 Loc = RD->getLocation(); 5289 5290 // If we have a virtual destructor, look up the deallocation function 5291 FunctionDecl *OperatorDelete = 0; 5292 DeclarationName Name = 5293 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5294 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5295 return true; 5296 5297 MarkDeclarationReferenced(Loc, OperatorDelete); 5298 5299 Destructor->setOperatorDelete(OperatorDelete); 5300 } 5301 5302 return false; 5303} 5304 5305static inline bool 5306FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5307 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5308 FTI.ArgInfo[0].Param && 5309 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5310} 5311 5312/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5313/// the well-formednes of the destructor declarator @p D with type @p 5314/// R. If there are any errors in the declarator, this routine will 5315/// emit diagnostics and set the declarator to invalid. Even if this happens, 5316/// will be updated to reflect a well-formed type for the destructor and 5317/// returned. 5318QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5319 StorageClass& SC) { 5320 // C++ [class.dtor]p1: 5321 // [...] A typedef-name that names a class is a class-name 5322 // (7.1.3); however, a typedef-name that names a class shall not 5323 // be used as the identifier in the declarator for a destructor 5324 // declaration. 5325 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5326 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5327 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5328 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5329 else if (const TemplateSpecializationType *TST = 5330 DeclaratorType->getAs<TemplateSpecializationType>()) 5331 if (TST->isTypeAlias()) 5332 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5333 << DeclaratorType << 1; 5334 5335 // C++ [class.dtor]p2: 5336 // A destructor is used to destroy objects of its class type. A 5337 // destructor takes no parameters, and no return type can be 5338 // specified for it (not even void). The address of a destructor 5339 // shall not be taken. A destructor shall not be static. A 5340 // destructor can be invoked for a const, volatile or const 5341 // volatile object. A destructor shall not be declared const, 5342 // volatile or const volatile (9.3.2). 5343 if (SC == SC_Static) { 5344 if (!D.isInvalidType()) 5345 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5346 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5347 << SourceRange(D.getIdentifierLoc()) 5348 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5349 5350 SC = SC_None; 5351 } 5352 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5353 // Destructors don't have return types, but the parser will 5354 // happily parse something like: 5355 // 5356 // class X { 5357 // float ~X(); 5358 // }; 5359 // 5360 // The return type will be eliminated later. 5361 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5362 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5363 << SourceRange(D.getIdentifierLoc()); 5364 } 5365 5366 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5367 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5368 if (FTI.TypeQuals & Qualifiers::Const) 5369 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5370 << "const" << SourceRange(D.getIdentifierLoc()); 5371 if (FTI.TypeQuals & Qualifiers::Volatile) 5372 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5373 << "volatile" << SourceRange(D.getIdentifierLoc()); 5374 if (FTI.TypeQuals & Qualifiers::Restrict) 5375 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5376 << "restrict" << SourceRange(D.getIdentifierLoc()); 5377 D.setInvalidType(); 5378 } 5379 5380 // C++0x [class.dtor]p2: 5381 // A destructor shall not be declared with a ref-qualifier. 5382 if (FTI.hasRefQualifier()) { 5383 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5384 << FTI.RefQualifierIsLValueRef 5385 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5386 D.setInvalidType(); 5387 } 5388 5389 // Make sure we don't have any parameters. 5390 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5391 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5392 5393 // Delete the parameters. 5394 FTI.freeArgs(); 5395 D.setInvalidType(); 5396 } 5397 5398 // Make sure the destructor isn't variadic. 5399 if (FTI.isVariadic) { 5400 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5401 D.setInvalidType(); 5402 } 5403 5404 // Rebuild the function type "R" without any type qualifiers or 5405 // parameters (in case any of the errors above fired) and with 5406 // "void" as the return type, since destructors don't have return 5407 // types. 5408 if (!D.isInvalidType()) 5409 return R; 5410 5411 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5412 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5413 EPI.Variadic = false; 5414 EPI.TypeQuals = 0; 5415 EPI.RefQualifier = RQ_None; 5416 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5417} 5418 5419/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5420/// well-formednes of the conversion function declarator @p D with 5421/// type @p R. If there are any errors in the declarator, this routine 5422/// will emit diagnostics and return true. Otherwise, it will return 5423/// false. Either way, the type @p R will be updated to reflect a 5424/// well-formed type for the conversion operator. 5425void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5426 StorageClass& SC) { 5427 // C++ [class.conv.fct]p1: 5428 // Neither parameter types nor return type can be specified. The 5429 // type of a conversion function (8.3.5) is "function taking no 5430 // parameter returning conversion-type-id." 5431 if (SC == SC_Static) { 5432 if (!D.isInvalidType()) 5433 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5434 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5435 << SourceRange(D.getIdentifierLoc()); 5436 D.setInvalidType(); 5437 SC = SC_None; 5438 } 5439 5440 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5441 5442 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5443 // Conversion functions don't have return types, but the parser will 5444 // happily parse something like: 5445 // 5446 // class X { 5447 // float operator bool(); 5448 // }; 5449 // 5450 // The return type will be changed later anyway. 5451 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5452 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5453 << SourceRange(D.getIdentifierLoc()); 5454 D.setInvalidType(); 5455 } 5456 5457 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5458 5459 // Make sure we don't have any parameters. 5460 if (Proto->getNumArgs() > 0) { 5461 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5462 5463 // Delete the parameters. 5464 D.getFunctionTypeInfo().freeArgs(); 5465 D.setInvalidType(); 5466 } else if (Proto->isVariadic()) { 5467 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5468 D.setInvalidType(); 5469 } 5470 5471 // Diagnose "&operator bool()" and other such nonsense. This 5472 // is actually a gcc extension which we don't support. 5473 if (Proto->getResultType() != ConvType) { 5474 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5475 << Proto->getResultType(); 5476 D.setInvalidType(); 5477 ConvType = Proto->getResultType(); 5478 } 5479 5480 // C++ [class.conv.fct]p4: 5481 // The conversion-type-id shall not represent a function type nor 5482 // an array type. 5483 if (ConvType->isArrayType()) { 5484 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5485 ConvType = Context.getPointerType(ConvType); 5486 D.setInvalidType(); 5487 } else if (ConvType->isFunctionType()) { 5488 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5489 ConvType = Context.getPointerType(ConvType); 5490 D.setInvalidType(); 5491 } 5492 5493 // Rebuild the function type "R" without any parameters (in case any 5494 // of the errors above fired) and with the conversion type as the 5495 // return type. 5496 if (D.isInvalidType()) 5497 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5498 5499 // C++0x explicit conversion operators. 5500 if (D.getDeclSpec().isExplicitSpecified()) 5501 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5502 getLangOptions().CPlusPlus0x ? 5503 diag::warn_cxx98_compat_explicit_conversion_functions : 5504 diag::ext_explicit_conversion_functions) 5505 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5506} 5507 5508/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5509/// the declaration of the given C++ conversion function. This routine 5510/// is responsible for recording the conversion function in the C++ 5511/// class, if possible. 5512Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5513 assert(Conversion && "Expected to receive a conversion function declaration"); 5514 5515 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5516 5517 // Make sure we aren't redeclaring the conversion function. 5518 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5519 5520 // C++ [class.conv.fct]p1: 5521 // [...] A conversion function is never used to convert a 5522 // (possibly cv-qualified) object to the (possibly cv-qualified) 5523 // same object type (or a reference to it), to a (possibly 5524 // cv-qualified) base class of that type (or a reference to it), 5525 // or to (possibly cv-qualified) void. 5526 // FIXME: Suppress this warning if the conversion function ends up being a 5527 // virtual function that overrides a virtual function in a base class. 5528 QualType ClassType 5529 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5530 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5531 ConvType = ConvTypeRef->getPointeeType(); 5532 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5533 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5534 /* Suppress diagnostics for instantiations. */; 5535 else if (ConvType->isRecordType()) { 5536 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5537 if (ConvType == ClassType) 5538 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5539 << ClassType; 5540 else if (IsDerivedFrom(ClassType, ConvType)) 5541 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5542 << ClassType << ConvType; 5543 } else if (ConvType->isVoidType()) { 5544 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5545 << ClassType << ConvType; 5546 } 5547 5548 if (FunctionTemplateDecl *ConversionTemplate 5549 = Conversion->getDescribedFunctionTemplate()) 5550 return ConversionTemplate; 5551 5552 return Conversion; 5553} 5554 5555//===----------------------------------------------------------------------===// 5556// Namespace Handling 5557//===----------------------------------------------------------------------===// 5558 5559 5560 5561/// ActOnStartNamespaceDef - This is called at the start of a namespace 5562/// definition. 5563Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5564 SourceLocation InlineLoc, 5565 SourceLocation NamespaceLoc, 5566 SourceLocation IdentLoc, 5567 IdentifierInfo *II, 5568 SourceLocation LBrace, 5569 AttributeList *AttrList) { 5570 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5571 // For anonymous namespace, take the location of the left brace. 5572 SourceLocation Loc = II ? IdentLoc : LBrace; 5573 bool IsInline = InlineLoc.isValid(); 5574 bool IsInvalid = false; 5575 bool IsStd = false; 5576 bool AddToKnown = false; 5577 Scope *DeclRegionScope = NamespcScope->getParent(); 5578 5579 NamespaceDecl *PrevNS = 0; 5580 if (II) { 5581 // C++ [namespace.def]p2: 5582 // The identifier in an original-namespace-definition shall not 5583 // have been previously defined in the declarative region in 5584 // which the original-namespace-definition appears. The 5585 // identifier in an original-namespace-definition is the name of 5586 // the namespace. Subsequently in that declarative region, it is 5587 // treated as an original-namespace-name. 5588 // 5589 // Since namespace names are unique in their scope, and we don't 5590 // look through using directives, just look for any ordinary names. 5591 5592 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5593 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5594 Decl::IDNS_Namespace; 5595 NamedDecl *PrevDecl = 0; 5596 for (DeclContext::lookup_result R 5597 = CurContext->getRedeclContext()->lookup(II); 5598 R.first != R.second; ++R.first) { 5599 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5600 PrevDecl = *R.first; 5601 break; 5602 } 5603 } 5604 5605 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5606 5607 if (PrevNS) { 5608 // This is an extended namespace definition. 5609 if (IsInline != PrevNS->isInline()) { 5610 // inline-ness must match 5611 if (PrevNS->isInline()) { 5612 // The user probably just forgot the 'inline', so suggest that it 5613 // be added back. 5614 Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5615 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5616 } else { 5617 Diag(Loc, diag::err_inline_namespace_mismatch) 5618 << IsInline; 5619 } 5620 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5621 5622 IsInline = PrevNS->isInline(); 5623 } 5624 } else if (PrevDecl) { 5625 // This is an invalid name redefinition. 5626 Diag(Loc, diag::err_redefinition_different_kind) 5627 << II; 5628 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5629 IsInvalid = true; 5630 // Continue on to push Namespc as current DeclContext and return it. 5631 } else if (II->isStr("std") && 5632 CurContext->getRedeclContext()->isTranslationUnit()) { 5633 // This is the first "real" definition of the namespace "std", so update 5634 // our cache of the "std" namespace to point at this definition. 5635 PrevNS = getStdNamespace(); 5636 IsStd = true; 5637 AddToKnown = !IsInline; 5638 } else { 5639 // We've seen this namespace for the first time. 5640 AddToKnown = !IsInline; 5641 } 5642 } else { 5643 // Anonymous namespaces. 5644 5645 // Determine whether the parent already has an anonymous namespace. 5646 DeclContext *Parent = CurContext->getRedeclContext(); 5647 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5648 PrevNS = TU->getAnonymousNamespace(); 5649 } else { 5650 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5651 PrevNS = ND->getAnonymousNamespace(); 5652 } 5653 5654 if (PrevNS && IsInline != PrevNS->isInline()) { 5655 // inline-ness must match 5656 Diag(Loc, diag::err_inline_namespace_mismatch) 5657 << IsInline; 5658 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5659 5660 // Recover by ignoring the new namespace's inline status. 5661 IsInline = PrevNS->isInline(); 5662 } 5663 } 5664 5665 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5666 StartLoc, Loc, II, PrevNS); 5667 if (IsInvalid) 5668 Namespc->setInvalidDecl(); 5669 5670 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5671 5672 // FIXME: Should we be merging attributes? 5673 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5674 PushNamespaceVisibilityAttr(Attr); 5675 5676 if (IsStd) 5677 StdNamespace = Namespc; 5678 if (AddToKnown) 5679 KnownNamespaces[Namespc] = false; 5680 5681 if (II) { 5682 PushOnScopeChains(Namespc, DeclRegionScope); 5683 } else { 5684 // Link the anonymous namespace into its parent. 5685 DeclContext *Parent = CurContext->getRedeclContext(); 5686 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5687 TU->setAnonymousNamespace(Namespc); 5688 } else { 5689 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5690 } 5691 5692 CurContext->addDecl(Namespc); 5693 5694 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5695 // behaves as if it were replaced by 5696 // namespace unique { /* empty body */ } 5697 // using namespace unique; 5698 // namespace unique { namespace-body } 5699 // where all occurrences of 'unique' in a translation unit are 5700 // replaced by the same identifier and this identifier differs 5701 // from all other identifiers in the entire program. 5702 5703 // We just create the namespace with an empty name and then add an 5704 // implicit using declaration, just like the standard suggests. 5705 // 5706 // CodeGen enforces the "universally unique" aspect by giving all 5707 // declarations semantically contained within an anonymous 5708 // namespace internal linkage. 5709 5710 if (!PrevNS) { 5711 UsingDirectiveDecl* UD 5712 = UsingDirectiveDecl::Create(Context, CurContext, 5713 /* 'using' */ LBrace, 5714 /* 'namespace' */ SourceLocation(), 5715 /* qualifier */ NestedNameSpecifierLoc(), 5716 /* identifier */ SourceLocation(), 5717 Namespc, 5718 /* Ancestor */ CurContext); 5719 UD->setImplicit(); 5720 CurContext->addDecl(UD); 5721 } 5722 } 5723 5724 // Although we could have an invalid decl (i.e. the namespace name is a 5725 // redefinition), push it as current DeclContext and try to continue parsing. 5726 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5727 // for the namespace has the declarations that showed up in that particular 5728 // namespace definition. 5729 PushDeclContext(NamespcScope, Namespc); 5730 return Namespc; 5731} 5732 5733/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5734/// is a namespace alias, returns the namespace it points to. 5735static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5736 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5737 return AD->getNamespace(); 5738 return dyn_cast_or_null<NamespaceDecl>(D); 5739} 5740 5741/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5742/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5743void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5744 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5745 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5746 Namespc->setRBraceLoc(RBrace); 5747 PopDeclContext(); 5748 if (Namespc->hasAttr<VisibilityAttr>()) 5749 PopPragmaVisibility(); 5750} 5751 5752CXXRecordDecl *Sema::getStdBadAlloc() const { 5753 return cast_or_null<CXXRecordDecl>( 5754 StdBadAlloc.get(Context.getExternalSource())); 5755} 5756 5757NamespaceDecl *Sema::getStdNamespace() const { 5758 return cast_or_null<NamespaceDecl>( 5759 StdNamespace.get(Context.getExternalSource())); 5760} 5761 5762/// \brief Retrieve the special "std" namespace, which may require us to 5763/// implicitly define the namespace. 5764NamespaceDecl *Sema::getOrCreateStdNamespace() { 5765 if (!StdNamespace) { 5766 // The "std" namespace has not yet been defined, so build one implicitly. 5767 StdNamespace = NamespaceDecl::Create(Context, 5768 Context.getTranslationUnitDecl(), 5769 /*Inline=*/false, 5770 SourceLocation(), SourceLocation(), 5771 &PP.getIdentifierTable().get("std"), 5772 /*PrevDecl=*/0); 5773 getStdNamespace()->setImplicit(true); 5774 } 5775 5776 return getStdNamespace(); 5777} 5778 5779bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 5780 assert(getLangOptions().CPlusPlus && 5781 "Looking for std::initializer_list outside of C++."); 5782 5783 // We're looking for implicit instantiations of 5784 // template <typename E> class std::initializer_list. 5785 5786 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 5787 return false; 5788 5789 ClassTemplateDecl *Template = 0; 5790 const TemplateArgument *Arguments = 0; 5791 5792 if (const RecordType *RT = Ty->getAs<RecordType>()) { 5793 5794 ClassTemplateSpecializationDecl *Specialization = 5795 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 5796 if (!Specialization) 5797 return false; 5798 5799 if (Specialization->getSpecializationKind() != TSK_ImplicitInstantiation) 5800 return false; 5801 5802 Template = Specialization->getSpecializedTemplate(); 5803 Arguments = Specialization->getTemplateArgs().data(); 5804 } else if (const TemplateSpecializationType *TST = 5805 Ty->getAs<TemplateSpecializationType>()) { 5806 Template = dyn_cast_or_null<ClassTemplateDecl>( 5807 TST->getTemplateName().getAsTemplateDecl()); 5808 Arguments = TST->getArgs(); 5809 } 5810 if (!Template) 5811 return false; 5812 5813 if (!StdInitializerList) { 5814 // Haven't recognized std::initializer_list yet, maybe this is it. 5815 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 5816 if (TemplateClass->getIdentifier() != 5817 &PP.getIdentifierTable().get("initializer_list") || 5818 !getStdNamespace()->InEnclosingNamespaceSetOf( 5819 TemplateClass->getDeclContext())) 5820 return false; 5821 // This is a template called std::initializer_list, but is it the right 5822 // template? 5823 TemplateParameterList *Params = Template->getTemplateParameters(); 5824 if (Params->getMinRequiredArguments() != 1) 5825 return false; 5826 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 5827 return false; 5828 5829 // It's the right template. 5830 StdInitializerList = Template; 5831 } 5832 5833 if (Template != StdInitializerList) 5834 return false; 5835 5836 // This is an instance of std::initializer_list. Find the argument type. 5837 if (Element) 5838 *Element = Arguments[0].getAsType(); 5839 return true; 5840} 5841 5842static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 5843 NamespaceDecl *Std = S.getStdNamespace(); 5844 if (!Std) { 5845 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5846 return 0; 5847 } 5848 5849 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 5850 Loc, Sema::LookupOrdinaryName); 5851 if (!S.LookupQualifiedName(Result, Std)) { 5852 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5853 return 0; 5854 } 5855 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 5856 if (!Template) { 5857 Result.suppressDiagnostics(); 5858 // We found something weird. Complain about the first thing we found. 5859 NamedDecl *Found = *Result.begin(); 5860 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 5861 return 0; 5862 } 5863 5864 // We found some template called std::initializer_list. Now verify that it's 5865 // correct. 5866 TemplateParameterList *Params = Template->getTemplateParameters(); 5867 if (Params->getMinRequiredArguments() != 1 || 5868 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 5869 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 5870 return 0; 5871 } 5872 5873 return Template; 5874} 5875 5876QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 5877 if (!StdInitializerList) { 5878 StdInitializerList = LookupStdInitializerList(*this, Loc); 5879 if (!StdInitializerList) 5880 return QualType(); 5881 } 5882 5883 TemplateArgumentListInfo Args(Loc, Loc); 5884 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 5885 Context.getTrivialTypeSourceInfo(Element, 5886 Loc))); 5887 return Context.getCanonicalType( 5888 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 5889} 5890 5891bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 5892 // C++ [dcl.init.list]p2: 5893 // A constructor is an initializer-list constructor if its first parameter 5894 // is of type std::initializer_list<E> or reference to possibly cv-qualified 5895 // std::initializer_list<E> for some type E, and either there are no other 5896 // parameters or else all other parameters have default arguments. 5897 if (Ctor->getNumParams() < 1 || 5898 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 5899 return false; 5900 5901 QualType ArgType = Ctor->getParamDecl(0)->getType(); 5902 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 5903 ArgType = RT->getPointeeType().getUnqualifiedType(); 5904 5905 return isStdInitializerList(ArgType, 0); 5906} 5907 5908/// \brief Determine whether a using statement is in a context where it will be 5909/// apply in all contexts. 5910static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5911 switch (CurContext->getDeclKind()) { 5912 case Decl::TranslationUnit: 5913 return true; 5914 case Decl::LinkageSpec: 5915 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5916 default: 5917 return false; 5918 } 5919} 5920 5921namespace { 5922 5923// Callback to only accept typo corrections that are namespaces. 5924class NamespaceValidatorCCC : public CorrectionCandidateCallback { 5925 public: 5926 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5927 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 5928 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 5929 } 5930 return false; 5931 } 5932}; 5933 5934} 5935 5936static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5937 CXXScopeSpec &SS, 5938 SourceLocation IdentLoc, 5939 IdentifierInfo *Ident) { 5940 NamespaceValidatorCCC Validator; 5941 R.clear(); 5942 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5943 R.getLookupKind(), Sc, &SS, 5944 &Validator)) { 5945 std::string CorrectedStr(Corrected.getAsString(S.getLangOptions())); 5946 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOptions())); 5947 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5948 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5949 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5950 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5951 else 5952 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5953 << Ident << CorrectedQuotedStr 5954 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5955 5956 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5957 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5958 5959 Ident = Corrected.getCorrectionAsIdentifierInfo(); 5960 R.addDecl(Corrected.getCorrectionDecl()); 5961 return true; 5962 } 5963 return false; 5964} 5965 5966Decl *Sema::ActOnUsingDirective(Scope *S, 5967 SourceLocation UsingLoc, 5968 SourceLocation NamespcLoc, 5969 CXXScopeSpec &SS, 5970 SourceLocation IdentLoc, 5971 IdentifierInfo *NamespcName, 5972 AttributeList *AttrList) { 5973 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5974 assert(NamespcName && "Invalid NamespcName."); 5975 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5976 5977 // This can only happen along a recovery path. 5978 while (S->getFlags() & Scope::TemplateParamScope) 5979 S = S->getParent(); 5980 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5981 5982 UsingDirectiveDecl *UDir = 0; 5983 NestedNameSpecifier *Qualifier = 0; 5984 if (SS.isSet()) 5985 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5986 5987 // Lookup namespace name. 5988 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5989 LookupParsedName(R, S, &SS); 5990 if (R.isAmbiguous()) 5991 return 0; 5992 5993 if (R.empty()) { 5994 R.clear(); 5995 // Allow "using namespace std;" or "using namespace ::std;" even if 5996 // "std" hasn't been defined yet, for GCC compatibility. 5997 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5998 NamespcName->isStr("std")) { 5999 Diag(IdentLoc, diag::ext_using_undefined_std); 6000 R.addDecl(getOrCreateStdNamespace()); 6001 R.resolveKind(); 6002 } 6003 // Otherwise, attempt typo correction. 6004 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 6005 } 6006 6007 if (!R.empty()) { 6008 NamedDecl *Named = R.getFoundDecl(); 6009 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 6010 && "expected namespace decl"); 6011 // C++ [namespace.udir]p1: 6012 // A using-directive specifies that the names in the nominated 6013 // namespace can be used in the scope in which the 6014 // using-directive appears after the using-directive. During 6015 // unqualified name lookup (3.4.1), the names appear as if they 6016 // were declared in the nearest enclosing namespace which 6017 // contains both the using-directive and the nominated 6018 // namespace. [Note: in this context, "contains" means "contains 6019 // directly or indirectly". ] 6020 6021 // Find enclosing context containing both using-directive and 6022 // nominated namespace. 6023 NamespaceDecl *NS = getNamespaceDecl(Named); 6024 DeclContext *CommonAncestor = cast<DeclContext>(NS); 6025 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 6026 CommonAncestor = CommonAncestor->getParent(); 6027 6028 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 6029 SS.getWithLocInContext(Context), 6030 IdentLoc, Named, CommonAncestor); 6031 6032 if (IsUsingDirectiveInToplevelContext(CurContext) && 6033 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 6034 Diag(IdentLoc, diag::warn_using_directive_in_header); 6035 } 6036 6037 PushUsingDirective(S, UDir); 6038 } else { 6039 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6040 } 6041 6042 // FIXME: We ignore attributes for now. 6043 return UDir; 6044} 6045 6046void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 6047 // If scope has associated entity, then using directive is at namespace 6048 // or translation unit scope. We add UsingDirectiveDecls, into 6049 // it's lookup structure. 6050 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 6051 Ctx->addDecl(UDir); 6052 else 6053 // Otherwise it is block-sope. using-directives will affect lookup 6054 // only to the end of scope. 6055 S->PushUsingDirective(UDir); 6056} 6057 6058 6059Decl *Sema::ActOnUsingDeclaration(Scope *S, 6060 AccessSpecifier AS, 6061 bool HasUsingKeyword, 6062 SourceLocation UsingLoc, 6063 CXXScopeSpec &SS, 6064 UnqualifiedId &Name, 6065 AttributeList *AttrList, 6066 bool IsTypeName, 6067 SourceLocation TypenameLoc) { 6068 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6069 6070 switch (Name.getKind()) { 6071 case UnqualifiedId::IK_ImplicitSelfParam: 6072 case UnqualifiedId::IK_Identifier: 6073 case UnqualifiedId::IK_OperatorFunctionId: 6074 case UnqualifiedId::IK_LiteralOperatorId: 6075 case UnqualifiedId::IK_ConversionFunctionId: 6076 break; 6077 6078 case UnqualifiedId::IK_ConstructorName: 6079 case UnqualifiedId::IK_ConstructorTemplateId: 6080 // C++0x inherited constructors. 6081 Diag(Name.getSourceRange().getBegin(), 6082 getLangOptions().CPlusPlus0x ? 6083 diag::warn_cxx98_compat_using_decl_constructor : 6084 diag::err_using_decl_constructor) 6085 << SS.getRange(); 6086 6087 if (getLangOptions().CPlusPlus0x) break; 6088 6089 return 0; 6090 6091 case UnqualifiedId::IK_DestructorName: 6092 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 6093 << SS.getRange(); 6094 return 0; 6095 6096 case UnqualifiedId::IK_TemplateId: 6097 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 6098 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 6099 return 0; 6100 } 6101 6102 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 6103 DeclarationName TargetName = TargetNameInfo.getName(); 6104 if (!TargetName) 6105 return 0; 6106 6107 // Warn about using declarations. 6108 // TODO: store that the declaration was written without 'using' and 6109 // talk about access decls instead of using decls in the 6110 // diagnostics. 6111 if (!HasUsingKeyword) { 6112 UsingLoc = Name.getSourceRange().getBegin(); 6113 6114 Diag(UsingLoc, diag::warn_access_decl_deprecated) 6115 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 6116 } 6117 6118 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 6119 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 6120 return 0; 6121 6122 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 6123 TargetNameInfo, AttrList, 6124 /* IsInstantiation */ false, 6125 IsTypeName, TypenameLoc); 6126 if (UD) 6127 PushOnScopeChains(UD, S, /*AddToContext*/ false); 6128 6129 return UD; 6130} 6131 6132/// \brief Determine whether a using declaration considers the given 6133/// declarations as "equivalent", e.g., if they are redeclarations of 6134/// the same entity or are both typedefs of the same type. 6135static bool 6136IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 6137 bool &SuppressRedeclaration) { 6138 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 6139 SuppressRedeclaration = false; 6140 return true; 6141 } 6142 6143 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 6144 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 6145 SuppressRedeclaration = true; 6146 return Context.hasSameType(TD1->getUnderlyingType(), 6147 TD2->getUnderlyingType()); 6148 } 6149 6150 return false; 6151} 6152 6153 6154/// Determines whether to create a using shadow decl for a particular 6155/// decl, given the set of decls existing prior to this using lookup. 6156bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 6157 const LookupResult &Previous) { 6158 // Diagnose finding a decl which is not from a base class of the 6159 // current class. We do this now because there are cases where this 6160 // function will silently decide not to build a shadow decl, which 6161 // will pre-empt further diagnostics. 6162 // 6163 // We don't need to do this in C++0x because we do the check once on 6164 // the qualifier. 6165 // 6166 // FIXME: diagnose the following if we care enough: 6167 // struct A { int foo; }; 6168 // struct B : A { using A::foo; }; 6169 // template <class T> struct C : A {}; 6170 // template <class T> struct D : C<T> { using B::foo; } // <--- 6171 // This is invalid (during instantiation) in C++03 because B::foo 6172 // resolves to the using decl in B, which is not a base class of D<T>. 6173 // We can't diagnose it immediately because C<T> is an unknown 6174 // specialization. The UsingShadowDecl in D<T> then points directly 6175 // to A::foo, which will look well-formed when we instantiate. 6176 // The right solution is to not collapse the shadow-decl chain. 6177 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 6178 DeclContext *OrigDC = Orig->getDeclContext(); 6179 6180 // Handle enums and anonymous structs. 6181 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 6182 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 6183 while (OrigRec->isAnonymousStructOrUnion()) 6184 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 6185 6186 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 6187 if (OrigDC == CurContext) { 6188 Diag(Using->getLocation(), 6189 diag::err_using_decl_nested_name_specifier_is_current_class) 6190 << Using->getQualifierLoc().getSourceRange(); 6191 Diag(Orig->getLocation(), diag::note_using_decl_target); 6192 return true; 6193 } 6194 6195 Diag(Using->getQualifierLoc().getBeginLoc(), 6196 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6197 << Using->getQualifier() 6198 << cast<CXXRecordDecl>(CurContext) 6199 << Using->getQualifierLoc().getSourceRange(); 6200 Diag(Orig->getLocation(), diag::note_using_decl_target); 6201 return true; 6202 } 6203 } 6204 6205 if (Previous.empty()) return false; 6206 6207 NamedDecl *Target = Orig; 6208 if (isa<UsingShadowDecl>(Target)) 6209 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6210 6211 // If the target happens to be one of the previous declarations, we 6212 // don't have a conflict. 6213 // 6214 // FIXME: but we might be increasing its access, in which case we 6215 // should redeclare it. 6216 NamedDecl *NonTag = 0, *Tag = 0; 6217 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 6218 I != E; ++I) { 6219 NamedDecl *D = (*I)->getUnderlyingDecl(); 6220 bool Result; 6221 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 6222 return Result; 6223 6224 (isa<TagDecl>(D) ? Tag : NonTag) = D; 6225 } 6226 6227 if (Target->isFunctionOrFunctionTemplate()) { 6228 FunctionDecl *FD; 6229 if (isa<FunctionTemplateDecl>(Target)) 6230 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6231 else 6232 FD = cast<FunctionDecl>(Target); 6233 6234 NamedDecl *OldDecl = 0; 6235 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6236 case Ovl_Overload: 6237 return false; 6238 6239 case Ovl_NonFunction: 6240 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6241 break; 6242 6243 // We found a decl with the exact signature. 6244 case Ovl_Match: 6245 // If we're in a record, we want to hide the target, so we 6246 // return true (without a diagnostic) to tell the caller not to 6247 // build a shadow decl. 6248 if (CurContext->isRecord()) 6249 return true; 6250 6251 // If we're not in a record, this is an error. 6252 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6253 break; 6254 } 6255 6256 Diag(Target->getLocation(), diag::note_using_decl_target); 6257 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6258 return true; 6259 } 6260 6261 // Target is not a function. 6262 6263 if (isa<TagDecl>(Target)) { 6264 // No conflict between a tag and a non-tag. 6265 if (!Tag) return false; 6266 6267 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6268 Diag(Target->getLocation(), diag::note_using_decl_target); 6269 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6270 return true; 6271 } 6272 6273 // No conflict between a tag and a non-tag. 6274 if (!NonTag) return false; 6275 6276 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6277 Diag(Target->getLocation(), diag::note_using_decl_target); 6278 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6279 return true; 6280} 6281 6282/// Builds a shadow declaration corresponding to a 'using' declaration. 6283UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6284 UsingDecl *UD, 6285 NamedDecl *Orig) { 6286 6287 // If we resolved to another shadow declaration, just coalesce them. 6288 NamedDecl *Target = Orig; 6289 if (isa<UsingShadowDecl>(Target)) { 6290 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6291 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6292 } 6293 6294 UsingShadowDecl *Shadow 6295 = UsingShadowDecl::Create(Context, CurContext, 6296 UD->getLocation(), UD, Target); 6297 UD->addShadowDecl(Shadow); 6298 6299 Shadow->setAccess(UD->getAccess()); 6300 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6301 Shadow->setInvalidDecl(); 6302 6303 if (S) 6304 PushOnScopeChains(Shadow, S); 6305 else 6306 CurContext->addDecl(Shadow); 6307 6308 6309 return Shadow; 6310} 6311 6312/// Hides a using shadow declaration. This is required by the current 6313/// using-decl implementation when a resolvable using declaration in a 6314/// class is followed by a declaration which would hide or override 6315/// one or more of the using decl's targets; for example: 6316/// 6317/// struct Base { void foo(int); }; 6318/// struct Derived : Base { 6319/// using Base::foo; 6320/// void foo(int); 6321/// }; 6322/// 6323/// The governing language is C++03 [namespace.udecl]p12: 6324/// 6325/// When a using-declaration brings names from a base class into a 6326/// derived class scope, member functions in the derived class 6327/// override and/or hide member functions with the same name and 6328/// parameter types in a base class (rather than conflicting). 6329/// 6330/// There are two ways to implement this: 6331/// (1) optimistically create shadow decls when they're not hidden 6332/// by existing declarations, or 6333/// (2) don't create any shadow decls (or at least don't make them 6334/// visible) until we've fully parsed/instantiated the class. 6335/// The problem with (1) is that we might have to retroactively remove 6336/// a shadow decl, which requires several O(n) operations because the 6337/// decl structures are (very reasonably) not designed for removal. 6338/// (2) avoids this but is very fiddly and phase-dependent. 6339void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6340 if (Shadow->getDeclName().getNameKind() == 6341 DeclarationName::CXXConversionFunctionName) 6342 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6343 6344 // Remove it from the DeclContext... 6345 Shadow->getDeclContext()->removeDecl(Shadow); 6346 6347 // ...and the scope, if applicable... 6348 if (S) { 6349 S->RemoveDecl(Shadow); 6350 IdResolver.RemoveDecl(Shadow); 6351 } 6352 6353 // ...and the using decl. 6354 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6355 6356 // TODO: complain somehow if Shadow was used. It shouldn't 6357 // be possible for this to happen, because...? 6358} 6359 6360/// Builds a using declaration. 6361/// 6362/// \param IsInstantiation - Whether this call arises from an 6363/// instantiation of an unresolved using declaration. We treat 6364/// the lookup differently for these declarations. 6365NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6366 SourceLocation UsingLoc, 6367 CXXScopeSpec &SS, 6368 const DeclarationNameInfo &NameInfo, 6369 AttributeList *AttrList, 6370 bool IsInstantiation, 6371 bool IsTypeName, 6372 SourceLocation TypenameLoc) { 6373 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6374 SourceLocation IdentLoc = NameInfo.getLoc(); 6375 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6376 6377 // FIXME: We ignore attributes for now. 6378 6379 if (SS.isEmpty()) { 6380 Diag(IdentLoc, diag::err_using_requires_qualname); 6381 return 0; 6382 } 6383 6384 // Do the redeclaration lookup in the current scope. 6385 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6386 ForRedeclaration); 6387 Previous.setHideTags(false); 6388 if (S) { 6389 LookupName(Previous, S); 6390 6391 // It is really dumb that we have to do this. 6392 LookupResult::Filter F = Previous.makeFilter(); 6393 while (F.hasNext()) { 6394 NamedDecl *D = F.next(); 6395 if (!isDeclInScope(D, CurContext, S)) 6396 F.erase(); 6397 } 6398 F.done(); 6399 } else { 6400 assert(IsInstantiation && "no scope in non-instantiation"); 6401 assert(CurContext->isRecord() && "scope not record in instantiation"); 6402 LookupQualifiedName(Previous, CurContext); 6403 } 6404 6405 // Check for invalid redeclarations. 6406 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6407 return 0; 6408 6409 // Check for bad qualifiers. 6410 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6411 return 0; 6412 6413 DeclContext *LookupContext = computeDeclContext(SS); 6414 NamedDecl *D; 6415 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6416 if (!LookupContext) { 6417 if (IsTypeName) { 6418 // FIXME: not all declaration name kinds are legal here 6419 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6420 UsingLoc, TypenameLoc, 6421 QualifierLoc, 6422 IdentLoc, NameInfo.getName()); 6423 } else { 6424 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6425 QualifierLoc, NameInfo); 6426 } 6427 } else { 6428 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6429 NameInfo, IsTypeName); 6430 } 6431 D->setAccess(AS); 6432 CurContext->addDecl(D); 6433 6434 if (!LookupContext) return D; 6435 UsingDecl *UD = cast<UsingDecl>(D); 6436 6437 if (RequireCompleteDeclContext(SS, LookupContext)) { 6438 UD->setInvalidDecl(); 6439 return UD; 6440 } 6441 6442 // Constructor inheriting using decls get special treatment. 6443 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6444 if (CheckInheritedConstructorUsingDecl(UD)) 6445 UD->setInvalidDecl(); 6446 return UD; 6447 } 6448 6449 // Otherwise, look up the target name. 6450 6451 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6452 6453 // Unlike most lookups, we don't always want to hide tag 6454 // declarations: tag names are visible through the using declaration 6455 // even if hidden by ordinary names, *except* in a dependent context 6456 // where it's important for the sanity of two-phase lookup. 6457 if (!IsInstantiation) 6458 R.setHideTags(false); 6459 6460 LookupQualifiedName(R, LookupContext); 6461 6462 if (R.empty()) { 6463 Diag(IdentLoc, diag::err_no_member) 6464 << NameInfo.getName() << LookupContext << SS.getRange(); 6465 UD->setInvalidDecl(); 6466 return UD; 6467 } 6468 6469 if (R.isAmbiguous()) { 6470 UD->setInvalidDecl(); 6471 return UD; 6472 } 6473 6474 if (IsTypeName) { 6475 // If we asked for a typename and got a non-type decl, error out. 6476 if (!R.getAsSingle<TypeDecl>()) { 6477 Diag(IdentLoc, diag::err_using_typename_non_type); 6478 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6479 Diag((*I)->getUnderlyingDecl()->getLocation(), 6480 diag::note_using_decl_target); 6481 UD->setInvalidDecl(); 6482 return UD; 6483 } 6484 } else { 6485 // If we asked for a non-typename and we got a type, error out, 6486 // but only if this is an instantiation of an unresolved using 6487 // decl. Otherwise just silently find the type name. 6488 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6489 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6490 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6491 UD->setInvalidDecl(); 6492 return UD; 6493 } 6494 } 6495 6496 // C++0x N2914 [namespace.udecl]p6: 6497 // A using-declaration shall not name a namespace. 6498 if (R.getAsSingle<NamespaceDecl>()) { 6499 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6500 << SS.getRange(); 6501 UD->setInvalidDecl(); 6502 return UD; 6503 } 6504 6505 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6506 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6507 BuildUsingShadowDecl(S, UD, *I); 6508 } 6509 6510 return UD; 6511} 6512 6513/// Additional checks for a using declaration referring to a constructor name. 6514bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 6515 if (UD->isTypeName()) { 6516 // FIXME: Cannot specify typename when specifying constructor 6517 return true; 6518 } 6519 6520 const Type *SourceType = UD->getQualifier()->getAsType(); 6521 assert(SourceType && 6522 "Using decl naming constructor doesn't have type in scope spec."); 6523 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6524 6525 // Check whether the named type is a direct base class. 6526 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6527 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6528 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6529 BaseIt != BaseE; ++BaseIt) { 6530 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6531 if (CanonicalSourceType == BaseType) 6532 break; 6533 } 6534 6535 if (BaseIt == BaseE) { 6536 // Did not find SourceType in the bases. 6537 Diag(UD->getUsingLocation(), 6538 diag::err_using_decl_constructor_not_in_direct_base) 6539 << UD->getNameInfo().getSourceRange() 6540 << QualType(SourceType, 0) << TargetClass; 6541 return true; 6542 } 6543 6544 BaseIt->setInheritConstructors(); 6545 6546 return false; 6547} 6548 6549/// Checks that the given using declaration is not an invalid 6550/// redeclaration. Note that this is checking only for the using decl 6551/// itself, not for any ill-formedness among the UsingShadowDecls. 6552bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6553 bool isTypeName, 6554 const CXXScopeSpec &SS, 6555 SourceLocation NameLoc, 6556 const LookupResult &Prev) { 6557 // C++03 [namespace.udecl]p8: 6558 // C++0x [namespace.udecl]p10: 6559 // A using-declaration is a declaration and can therefore be used 6560 // repeatedly where (and only where) multiple declarations are 6561 // allowed. 6562 // 6563 // That's in non-member contexts. 6564 if (!CurContext->getRedeclContext()->isRecord()) 6565 return false; 6566 6567 NestedNameSpecifier *Qual 6568 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6569 6570 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6571 NamedDecl *D = *I; 6572 6573 bool DTypename; 6574 NestedNameSpecifier *DQual; 6575 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6576 DTypename = UD->isTypeName(); 6577 DQual = UD->getQualifier(); 6578 } else if (UnresolvedUsingValueDecl *UD 6579 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6580 DTypename = false; 6581 DQual = UD->getQualifier(); 6582 } else if (UnresolvedUsingTypenameDecl *UD 6583 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6584 DTypename = true; 6585 DQual = UD->getQualifier(); 6586 } else continue; 6587 6588 // using decls differ if one says 'typename' and the other doesn't. 6589 // FIXME: non-dependent using decls? 6590 if (isTypeName != DTypename) continue; 6591 6592 // using decls differ if they name different scopes (but note that 6593 // template instantiation can cause this check to trigger when it 6594 // didn't before instantiation). 6595 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6596 Context.getCanonicalNestedNameSpecifier(DQual)) 6597 continue; 6598 6599 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6600 Diag(D->getLocation(), diag::note_using_decl) << 1; 6601 return true; 6602 } 6603 6604 return false; 6605} 6606 6607 6608/// Checks that the given nested-name qualifier used in a using decl 6609/// in the current context is appropriately related to the current 6610/// scope. If an error is found, diagnoses it and returns true. 6611bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6612 const CXXScopeSpec &SS, 6613 SourceLocation NameLoc) { 6614 DeclContext *NamedContext = computeDeclContext(SS); 6615 6616 if (!CurContext->isRecord()) { 6617 // C++03 [namespace.udecl]p3: 6618 // C++0x [namespace.udecl]p8: 6619 // A using-declaration for a class member shall be a member-declaration. 6620 6621 // If we weren't able to compute a valid scope, it must be a 6622 // dependent class scope. 6623 if (!NamedContext || NamedContext->isRecord()) { 6624 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6625 << SS.getRange(); 6626 return true; 6627 } 6628 6629 // Otherwise, everything is known to be fine. 6630 return false; 6631 } 6632 6633 // The current scope is a record. 6634 6635 // If the named context is dependent, we can't decide much. 6636 if (!NamedContext) { 6637 // FIXME: in C++0x, we can diagnose if we can prove that the 6638 // nested-name-specifier does not refer to a base class, which is 6639 // still possible in some cases. 6640 6641 // Otherwise we have to conservatively report that things might be 6642 // okay. 6643 return false; 6644 } 6645 6646 if (!NamedContext->isRecord()) { 6647 // Ideally this would point at the last name in the specifier, 6648 // but we don't have that level of source info. 6649 Diag(SS.getRange().getBegin(), 6650 diag::err_using_decl_nested_name_specifier_is_not_class) 6651 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6652 return true; 6653 } 6654 6655 if (!NamedContext->isDependentContext() && 6656 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6657 return true; 6658 6659 if (getLangOptions().CPlusPlus0x) { 6660 // C++0x [namespace.udecl]p3: 6661 // In a using-declaration used as a member-declaration, the 6662 // nested-name-specifier shall name a base class of the class 6663 // being defined. 6664 6665 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6666 cast<CXXRecordDecl>(NamedContext))) { 6667 if (CurContext == NamedContext) { 6668 Diag(NameLoc, 6669 diag::err_using_decl_nested_name_specifier_is_current_class) 6670 << SS.getRange(); 6671 return true; 6672 } 6673 6674 Diag(SS.getRange().getBegin(), 6675 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6676 << (NestedNameSpecifier*) SS.getScopeRep() 6677 << cast<CXXRecordDecl>(CurContext) 6678 << SS.getRange(); 6679 return true; 6680 } 6681 6682 return false; 6683 } 6684 6685 // C++03 [namespace.udecl]p4: 6686 // A using-declaration used as a member-declaration shall refer 6687 // to a member of a base class of the class being defined [etc.]. 6688 6689 // Salient point: SS doesn't have to name a base class as long as 6690 // lookup only finds members from base classes. Therefore we can 6691 // diagnose here only if we can prove that that can't happen, 6692 // i.e. if the class hierarchies provably don't intersect. 6693 6694 // TODO: it would be nice if "definitely valid" results were cached 6695 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6696 // need to be repeated. 6697 6698 struct UserData { 6699 llvm::DenseSet<const CXXRecordDecl*> Bases; 6700 6701 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6702 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6703 Data->Bases.insert(Base); 6704 return true; 6705 } 6706 6707 bool hasDependentBases(const CXXRecordDecl *Class) { 6708 return !Class->forallBases(collect, this); 6709 } 6710 6711 /// Returns true if the base is dependent or is one of the 6712 /// accumulated base classes. 6713 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6714 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6715 return !Data->Bases.count(Base); 6716 } 6717 6718 bool mightShareBases(const CXXRecordDecl *Class) { 6719 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6720 } 6721 }; 6722 6723 UserData Data; 6724 6725 // Returns false if we find a dependent base. 6726 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6727 return false; 6728 6729 // Returns false if the class has a dependent base or if it or one 6730 // of its bases is present in the base set of the current context. 6731 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6732 return false; 6733 6734 Diag(SS.getRange().getBegin(), 6735 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6736 << (NestedNameSpecifier*) SS.getScopeRep() 6737 << cast<CXXRecordDecl>(CurContext) 6738 << SS.getRange(); 6739 6740 return true; 6741} 6742 6743Decl *Sema::ActOnAliasDeclaration(Scope *S, 6744 AccessSpecifier AS, 6745 MultiTemplateParamsArg TemplateParamLists, 6746 SourceLocation UsingLoc, 6747 UnqualifiedId &Name, 6748 TypeResult Type) { 6749 // Skip up to the relevant declaration scope. 6750 while (S->getFlags() & Scope::TemplateParamScope) 6751 S = S->getParent(); 6752 assert((S->getFlags() & Scope::DeclScope) && 6753 "got alias-declaration outside of declaration scope"); 6754 6755 if (Type.isInvalid()) 6756 return 0; 6757 6758 bool Invalid = false; 6759 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6760 TypeSourceInfo *TInfo = 0; 6761 GetTypeFromParser(Type.get(), &TInfo); 6762 6763 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6764 return 0; 6765 6766 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6767 UPPC_DeclarationType)) { 6768 Invalid = true; 6769 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6770 TInfo->getTypeLoc().getBeginLoc()); 6771 } 6772 6773 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6774 LookupName(Previous, S); 6775 6776 // Warn about shadowing the name of a template parameter. 6777 if (Previous.isSingleResult() && 6778 Previous.getFoundDecl()->isTemplateParameter()) { 6779 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6780 Previous.clear(); 6781 } 6782 6783 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6784 "name in alias declaration must be an identifier"); 6785 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6786 Name.StartLocation, 6787 Name.Identifier, TInfo); 6788 6789 NewTD->setAccess(AS); 6790 6791 if (Invalid) 6792 NewTD->setInvalidDecl(); 6793 6794 CheckTypedefForVariablyModifiedType(S, NewTD); 6795 Invalid |= NewTD->isInvalidDecl(); 6796 6797 bool Redeclaration = false; 6798 6799 NamedDecl *NewND; 6800 if (TemplateParamLists.size()) { 6801 TypeAliasTemplateDecl *OldDecl = 0; 6802 TemplateParameterList *OldTemplateParams = 0; 6803 6804 if (TemplateParamLists.size() != 1) { 6805 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6806 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6807 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6808 } 6809 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6810 6811 // Only consider previous declarations in the same scope. 6812 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6813 /*ExplicitInstantiationOrSpecialization*/false); 6814 if (!Previous.empty()) { 6815 Redeclaration = true; 6816 6817 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6818 if (!OldDecl && !Invalid) { 6819 Diag(UsingLoc, diag::err_redefinition_different_kind) 6820 << Name.Identifier; 6821 6822 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6823 if (OldD->getLocation().isValid()) 6824 Diag(OldD->getLocation(), diag::note_previous_definition); 6825 6826 Invalid = true; 6827 } 6828 6829 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6830 if (TemplateParameterListsAreEqual(TemplateParams, 6831 OldDecl->getTemplateParameters(), 6832 /*Complain=*/true, 6833 TPL_TemplateMatch)) 6834 OldTemplateParams = OldDecl->getTemplateParameters(); 6835 else 6836 Invalid = true; 6837 6838 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6839 if (!Invalid && 6840 !Context.hasSameType(OldTD->getUnderlyingType(), 6841 NewTD->getUnderlyingType())) { 6842 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6843 // but we can't reasonably accept it. 6844 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6845 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6846 if (OldTD->getLocation().isValid()) 6847 Diag(OldTD->getLocation(), diag::note_previous_definition); 6848 Invalid = true; 6849 } 6850 } 6851 } 6852 6853 // Merge any previous default template arguments into our parameters, 6854 // and check the parameter list. 6855 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6856 TPC_TypeAliasTemplate)) 6857 return 0; 6858 6859 TypeAliasTemplateDecl *NewDecl = 6860 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6861 Name.Identifier, TemplateParams, 6862 NewTD); 6863 6864 NewDecl->setAccess(AS); 6865 6866 if (Invalid) 6867 NewDecl->setInvalidDecl(); 6868 else if (OldDecl) 6869 NewDecl->setPreviousDeclaration(OldDecl); 6870 6871 NewND = NewDecl; 6872 } else { 6873 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6874 NewND = NewTD; 6875 } 6876 6877 if (!Redeclaration) 6878 PushOnScopeChains(NewND, S); 6879 6880 return NewND; 6881} 6882 6883Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6884 SourceLocation NamespaceLoc, 6885 SourceLocation AliasLoc, 6886 IdentifierInfo *Alias, 6887 CXXScopeSpec &SS, 6888 SourceLocation IdentLoc, 6889 IdentifierInfo *Ident) { 6890 6891 // Lookup the namespace name. 6892 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6893 LookupParsedName(R, S, &SS); 6894 6895 // Check if we have a previous declaration with the same name. 6896 NamedDecl *PrevDecl 6897 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6898 ForRedeclaration); 6899 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6900 PrevDecl = 0; 6901 6902 if (PrevDecl) { 6903 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6904 // We already have an alias with the same name that points to the same 6905 // namespace, so don't create a new one. 6906 // FIXME: At some point, we'll want to create the (redundant) 6907 // declaration to maintain better source information. 6908 if (!R.isAmbiguous() && !R.empty() && 6909 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6910 return 0; 6911 } 6912 6913 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6914 diag::err_redefinition_different_kind; 6915 Diag(AliasLoc, DiagID) << Alias; 6916 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6917 return 0; 6918 } 6919 6920 if (R.isAmbiguous()) 6921 return 0; 6922 6923 if (R.empty()) { 6924 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6925 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 6926 return 0; 6927 } 6928 } 6929 6930 NamespaceAliasDecl *AliasDecl = 6931 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6932 Alias, SS.getWithLocInContext(Context), 6933 IdentLoc, R.getFoundDecl()); 6934 6935 PushOnScopeChains(AliasDecl, S); 6936 return AliasDecl; 6937} 6938 6939namespace { 6940 /// \brief Scoped object used to handle the state changes required in Sema 6941 /// to implicitly define the body of a C++ member function; 6942 class ImplicitlyDefinedFunctionScope { 6943 Sema &S; 6944 Sema::ContextRAII SavedContext; 6945 6946 public: 6947 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6948 : S(S), SavedContext(S, Method) 6949 { 6950 S.PushFunctionScope(); 6951 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6952 } 6953 6954 ~ImplicitlyDefinedFunctionScope() { 6955 S.PopExpressionEvaluationContext(); 6956 S.PopFunctionScopeInfo(); 6957 } 6958 }; 6959} 6960 6961Sema::ImplicitExceptionSpecification 6962Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6963 // C++ [except.spec]p14: 6964 // An implicitly declared special member function (Clause 12) shall have an 6965 // exception-specification. [...] 6966 ImplicitExceptionSpecification ExceptSpec(Context); 6967 if (ClassDecl->isInvalidDecl()) 6968 return ExceptSpec; 6969 6970 // Direct base-class constructors. 6971 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6972 BEnd = ClassDecl->bases_end(); 6973 B != BEnd; ++B) { 6974 if (B->isVirtual()) // Handled below. 6975 continue; 6976 6977 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6978 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6979 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6980 // If this is a deleted function, add it anyway. This might be conformant 6981 // with the standard. This might not. I'm not sure. It might not matter. 6982 if (Constructor) 6983 ExceptSpec.CalledDecl(Constructor); 6984 } 6985 } 6986 6987 // Virtual base-class constructors. 6988 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6989 BEnd = ClassDecl->vbases_end(); 6990 B != BEnd; ++B) { 6991 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6992 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6993 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6994 // If this is a deleted function, add it anyway. This might be conformant 6995 // with the standard. This might not. I'm not sure. It might not matter. 6996 if (Constructor) 6997 ExceptSpec.CalledDecl(Constructor); 6998 } 6999 } 7000 7001 // Field constructors. 7002 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7003 FEnd = ClassDecl->field_end(); 7004 F != FEnd; ++F) { 7005 if (F->hasInClassInitializer()) { 7006 if (Expr *E = F->getInClassInitializer()) 7007 ExceptSpec.CalledExpr(E); 7008 else if (!F->isInvalidDecl()) 7009 ExceptSpec.SetDelayed(); 7010 } else if (const RecordType *RecordTy 7011 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 7012 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7013 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 7014 // If this is a deleted function, add it anyway. This might be conformant 7015 // with the standard. This might not. I'm not sure. It might not matter. 7016 // In particular, the problem is that this function never gets called. It 7017 // might just be ill-formed because this function attempts to refer to 7018 // a deleted function here. 7019 if (Constructor) 7020 ExceptSpec.CalledDecl(Constructor); 7021 } 7022 } 7023 7024 return ExceptSpec; 7025} 7026 7027CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 7028 CXXRecordDecl *ClassDecl) { 7029 // C++ [class.ctor]p5: 7030 // A default constructor for a class X is a constructor of class X 7031 // that can be called without an argument. If there is no 7032 // user-declared constructor for class X, a default constructor is 7033 // implicitly declared. An implicitly-declared default constructor 7034 // is an inline public member of its class. 7035 assert(!ClassDecl->hasUserDeclaredConstructor() && 7036 "Should not build implicit default constructor!"); 7037 7038 ImplicitExceptionSpecification Spec = 7039 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 7040 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7041 7042 // Create the actual constructor declaration. 7043 CanQualType ClassType 7044 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7045 SourceLocation ClassLoc = ClassDecl->getLocation(); 7046 DeclarationName Name 7047 = Context.DeclarationNames.getCXXConstructorName(ClassType); 7048 DeclarationNameInfo NameInfo(Name, ClassLoc); 7049 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 7050 Context, ClassDecl, ClassLoc, NameInfo, 7051 Context.getFunctionType(Context.VoidTy, 0, 0, EPI), /*TInfo=*/0, 7052 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 7053 /*isConstexpr=*/ClassDecl->defaultedDefaultConstructorIsConstexpr() && 7054 getLangOptions().CPlusPlus0x); 7055 DefaultCon->setAccess(AS_public); 7056 DefaultCon->setDefaulted(); 7057 DefaultCon->setImplicit(); 7058 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 7059 7060 // Note that we have declared this constructor. 7061 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 7062 7063 if (Scope *S = getScopeForContext(ClassDecl)) 7064 PushOnScopeChains(DefaultCon, S, false); 7065 ClassDecl->addDecl(DefaultCon); 7066 7067 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 7068 DefaultCon->setDeletedAsWritten(); 7069 7070 return DefaultCon; 7071} 7072 7073void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 7074 CXXConstructorDecl *Constructor) { 7075 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 7076 !Constructor->doesThisDeclarationHaveABody() && 7077 !Constructor->isDeleted()) && 7078 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 7079 7080 CXXRecordDecl *ClassDecl = Constructor->getParent(); 7081 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 7082 7083 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 7084 DiagnosticErrorTrap Trap(Diags); 7085 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 7086 Trap.hasErrorOccurred()) { 7087 Diag(CurrentLocation, diag::note_member_synthesized_at) 7088 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 7089 Constructor->setInvalidDecl(); 7090 return; 7091 } 7092 7093 SourceLocation Loc = Constructor->getLocation(); 7094 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7095 7096 Constructor->setUsed(); 7097 MarkVTableUsed(CurrentLocation, ClassDecl); 7098 7099 if (ASTMutationListener *L = getASTMutationListener()) { 7100 L->CompletedImplicitDefinition(Constructor); 7101 } 7102} 7103 7104/// Get any existing defaulted default constructor for the given class. Do not 7105/// implicitly define one if it does not exist. 7106static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 7107 CXXRecordDecl *D) { 7108 ASTContext &Context = Self.Context; 7109 QualType ClassType = Context.getTypeDeclType(D); 7110 DeclarationName ConstructorName 7111 = Context.DeclarationNames.getCXXConstructorName( 7112 Context.getCanonicalType(ClassType.getUnqualifiedType())); 7113 7114 DeclContext::lookup_const_iterator Con, ConEnd; 7115 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 7116 Con != ConEnd; ++Con) { 7117 // A function template cannot be defaulted. 7118 if (isa<FunctionTemplateDecl>(*Con)) 7119 continue; 7120 7121 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 7122 if (Constructor->isDefaultConstructor()) 7123 return Constructor->isDefaulted() ? Constructor : 0; 7124 } 7125 return 0; 7126} 7127 7128void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 7129 if (!D) return; 7130 AdjustDeclIfTemplate(D); 7131 7132 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 7133 CXXConstructorDecl *CtorDecl 7134 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 7135 7136 if (!CtorDecl) return; 7137 7138 // Compute the exception specification for the default constructor. 7139 const FunctionProtoType *CtorTy = 7140 CtorDecl->getType()->castAs<FunctionProtoType>(); 7141 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 7142 ImplicitExceptionSpecification Spec = 7143 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 7144 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7145 assert(EPI.ExceptionSpecType != EST_Delayed); 7146 7147 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7148 } 7149 7150 // If the default constructor is explicitly defaulted, checking the exception 7151 // specification is deferred until now. 7152 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 7153 !ClassDecl->isDependentType()) 7154 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 7155} 7156 7157void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 7158 // We start with an initial pass over the base classes to collect those that 7159 // inherit constructors from. If there are none, we can forgo all further 7160 // processing. 7161 typedef SmallVector<const RecordType *, 4> BasesVector; 7162 BasesVector BasesToInheritFrom; 7163 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 7164 BaseE = ClassDecl->bases_end(); 7165 BaseIt != BaseE; ++BaseIt) { 7166 if (BaseIt->getInheritConstructors()) { 7167 QualType Base = BaseIt->getType(); 7168 if (Base->isDependentType()) { 7169 // If we inherit constructors from anything that is dependent, just 7170 // abort processing altogether. We'll get another chance for the 7171 // instantiations. 7172 return; 7173 } 7174 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 7175 } 7176 } 7177 if (BasesToInheritFrom.empty()) 7178 return; 7179 7180 // Now collect the constructors that we already have in the current class. 7181 // Those take precedence over inherited constructors. 7182 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 7183 // unless there is a user-declared constructor with the same signature in 7184 // the class where the using-declaration appears. 7185 llvm::SmallSet<const Type *, 8> ExistingConstructors; 7186 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 7187 CtorE = ClassDecl->ctor_end(); 7188 CtorIt != CtorE; ++CtorIt) { 7189 ExistingConstructors.insert( 7190 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 7191 } 7192 7193 Scope *S = getScopeForContext(ClassDecl); 7194 DeclarationName CreatedCtorName = 7195 Context.DeclarationNames.getCXXConstructorName( 7196 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 7197 7198 // Now comes the true work. 7199 // First, we keep a map from constructor types to the base that introduced 7200 // them. Needed for finding conflicting constructors. We also keep the 7201 // actually inserted declarations in there, for pretty diagnostics. 7202 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 7203 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 7204 ConstructorToSourceMap InheritedConstructors; 7205 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 7206 BaseE = BasesToInheritFrom.end(); 7207 BaseIt != BaseE; ++BaseIt) { 7208 const RecordType *Base = *BaseIt; 7209 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 7210 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 7211 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 7212 CtorE = BaseDecl->ctor_end(); 7213 CtorIt != CtorE; ++CtorIt) { 7214 // Find the using declaration for inheriting this base's constructors. 7215 DeclarationName Name = 7216 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 7217 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 7218 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 7219 SourceLocation UsingLoc = UD ? UD->getLocation() : 7220 ClassDecl->getLocation(); 7221 7222 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 7223 // from the class X named in the using-declaration consists of actual 7224 // constructors and notional constructors that result from the 7225 // transformation of defaulted parameters as follows: 7226 // - all non-template default constructors of X, and 7227 // - for each non-template constructor of X that has at least one 7228 // parameter with a default argument, the set of constructors that 7229 // results from omitting any ellipsis parameter specification and 7230 // successively omitting parameters with a default argument from the 7231 // end of the parameter-type-list. 7232 CXXConstructorDecl *BaseCtor = *CtorIt; 7233 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 7234 const FunctionProtoType *BaseCtorType = 7235 BaseCtor->getType()->getAs<FunctionProtoType>(); 7236 7237 for (unsigned params = BaseCtor->getMinRequiredArguments(), 7238 maxParams = BaseCtor->getNumParams(); 7239 params <= maxParams; ++params) { 7240 // Skip default constructors. They're never inherited. 7241 if (params == 0) 7242 continue; 7243 // Skip copy and move constructors for the same reason. 7244 if (CanBeCopyOrMove && params == 1) 7245 continue; 7246 7247 // Build up a function type for this particular constructor. 7248 // FIXME: The working paper does not consider that the exception spec 7249 // for the inheriting constructor might be larger than that of the 7250 // source. This code doesn't yet, either. When it does, this code will 7251 // need to be delayed until after exception specifications and in-class 7252 // member initializers are attached. 7253 const Type *NewCtorType; 7254 if (params == maxParams) 7255 NewCtorType = BaseCtorType; 7256 else { 7257 SmallVector<QualType, 16> Args; 7258 for (unsigned i = 0; i < params; ++i) { 7259 Args.push_back(BaseCtorType->getArgType(i)); 7260 } 7261 FunctionProtoType::ExtProtoInfo ExtInfo = 7262 BaseCtorType->getExtProtoInfo(); 7263 ExtInfo.Variadic = false; 7264 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7265 Args.data(), params, ExtInfo) 7266 .getTypePtr(); 7267 } 7268 const Type *CanonicalNewCtorType = 7269 Context.getCanonicalType(NewCtorType); 7270 7271 // Now that we have the type, first check if the class already has a 7272 // constructor with this signature. 7273 if (ExistingConstructors.count(CanonicalNewCtorType)) 7274 continue; 7275 7276 // Then we check if we have already declared an inherited constructor 7277 // with this signature. 7278 std::pair<ConstructorToSourceMap::iterator, bool> result = 7279 InheritedConstructors.insert(std::make_pair( 7280 CanonicalNewCtorType, 7281 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7282 if (!result.second) { 7283 // Already in the map. If it came from a different class, that's an 7284 // error. Not if it's from the same. 7285 CanQualType PreviousBase = result.first->second.first; 7286 if (CanonicalBase != PreviousBase) { 7287 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7288 const CXXConstructorDecl *PrevBaseCtor = 7289 PrevCtor->getInheritedConstructor(); 7290 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7291 7292 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7293 Diag(BaseCtor->getLocation(), 7294 diag::note_using_decl_constructor_conflict_current_ctor); 7295 Diag(PrevBaseCtor->getLocation(), 7296 diag::note_using_decl_constructor_conflict_previous_ctor); 7297 Diag(PrevCtor->getLocation(), 7298 diag::note_using_decl_constructor_conflict_previous_using); 7299 } 7300 continue; 7301 } 7302 7303 // OK, we're there, now add the constructor. 7304 // C++0x [class.inhctor]p8: [...] that would be performed by a 7305 // user-written inline constructor [...] 7306 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7307 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7308 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7309 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7310 /*ImplicitlyDeclared=*/true, 7311 // FIXME: Due to a defect in the standard, we treat inherited 7312 // constructors as constexpr even if that makes them ill-formed. 7313 /*Constexpr=*/BaseCtor->isConstexpr()); 7314 NewCtor->setAccess(BaseCtor->getAccess()); 7315 7316 // Build up the parameter decls and add them. 7317 SmallVector<ParmVarDecl *, 16> ParamDecls; 7318 for (unsigned i = 0; i < params; ++i) { 7319 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7320 UsingLoc, UsingLoc, 7321 /*IdentifierInfo=*/0, 7322 BaseCtorType->getArgType(i), 7323 /*TInfo=*/0, SC_None, 7324 SC_None, /*DefaultArg=*/0)); 7325 } 7326 NewCtor->setParams(ParamDecls); 7327 NewCtor->setInheritedConstructor(BaseCtor); 7328 7329 PushOnScopeChains(NewCtor, S, false); 7330 ClassDecl->addDecl(NewCtor); 7331 result.first->second.second = NewCtor; 7332 } 7333 } 7334 } 7335} 7336 7337Sema::ImplicitExceptionSpecification 7338Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7339 // C++ [except.spec]p14: 7340 // An implicitly declared special member function (Clause 12) shall have 7341 // an exception-specification. 7342 ImplicitExceptionSpecification ExceptSpec(Context); 7343 if (ClassDecl->isInvalidDecl()) 7344 return ExceptSpec; 7345 7346 // Direct base-class destructors. 7347 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7348 BEnd = ClassDecl->bases_end(); 7349 B != BEnd; ++B) { 7350 if (B->isVirtual()) // Handled below. 7351 continue; 7352 7353 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7354 ExceptSpec.CalledDecl( 7355 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7356 } 7357 7358 // Virtual base-class destructors. 7359 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7360 BEnd = ClassDecl->vbases_end(); 7361 B != BEnd; ++B) { 7362 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7363 ExceptSpec.CalledDecl( 7364 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7365 } 7366 7367 // Field destructors. 7368 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7369 FEnd = ClassDecl->field_end(); 7370 F != FEnd; ++F) { 7371 if (const RecordType *RecordTy 7372 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7373 ExceptSpec.CalledDecl( 7374 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7375 } 7376 7377 return ExceptSpec; 7378} 7379 7380CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7381 // C++ [class.dtor]p2: 7382 // If a class has no user-declared destructor, a destructor is 7383 // declared implicitly. An implicitly-declared destructor is an 7384 // inline public member of its class. 7385 7386 ImplicitExceptionSpecification Spec = 7387 ComputeDefaultedDtorExceptionSpec(ClassDecl); 7388 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7389 7390 // Create the actual destructor declaration. 7391 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 7392 7393 CanQualType ClassType 7394 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7395 SourceLocation ClassLoc = ClassDecl->getLocation(); 7396 DeclarationName Name 7397 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7398 DeclarationNameInfo NameInfo(Name, ClassLoc); 7399 CXXDestructorDecl *Destructor 7400 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 7401 /*isInline=*/true, 7402 /*isImplicitlyDeclared=*/true); 7403 Destructor->setAccess(AS_public); 7404 Destructor->setDefaulted(); 7405 Destructor->setImplicit(); 7406 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7407 7408 // Note that we have declared this destructor. 7409 ++ASTContext::NumImplicitDestructorsDeclared; 7410 7411 // Introduce this destructor into its scope. 7412 if (Scope *S = getScopeForContext(ClassDecl)) 7413 PushOnScopeChains(Destructor, S, false); 7414 ClassDecl->addDecl(Destructor); 7415 7416 // This could be uniqued if it ever proves significant. 7417 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 7418 7419 if (ShouldDeleteDestructor(Destructor)) 7420 Destructor->setDeletedAsWritten(); 7421 7422 AddOverriddenMethods(ClassDecl, Destructor); 7423 7424 return Destructor; 7425} 7426 7427void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7428 CXXDestructorDecl *Destructor) { 7429 assert((Destructor->isDefaulted() && 7430 !Destructor->doesThisDeclarationHaveABody()) && 7431 "DefineImplicitDestructor - call it for implicit default dtor"); 7432 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7433 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7434 7435 if (Destructor->isInvalidDecl()) 7436 return; 7437 7438 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7439 7440 DiagnosticErrorTrap Trap(Diags); 7441 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7442 Destructor->getParent()); 7443 7444 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7445 Diag(CurrentLocation, diag::note_member_synthesized_at) 7446 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7447 7448 Destructor->setInvalidDecl(); 7449 return; 7450 } 7451 7452 SourceLocation Loc = Destructor->getLocation(); 7453 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7454 Destructor->setImplicitlyDefined(true); 7455 Destructor->setUsed(); 7456 MarkVTableUsed(CurrentLocation, ClassDecl); 7457 7458 if (ASTMutationListener *L = getASTMutationListener()) { 7459 L->CompletedImplicitDefinition(Destructor); 7460 } 7461} 7462 7463void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 7464 CXXDestructorDecl *destructor) { 7465 // C++11 [class.dtor]p3: 7466 // A declaration of a destructor that does not have an exception- 7467 // specification is implicitly considered to have the same exception- 7468 // specification as an implicit declaration. 7469 const FunctionProtoType *dtorType = destructor->getType()-> 7470 getAs<FunctionProtoType>(); 7471 if (dtorType->hasExceptionSpec()) 7472 return; 7473 7474 ImplicitExceptionSpecification exceptSpec = 7475 ComputeDefaultedDtorExceptionSpec(classDecl); 7476 7477 // Replace the destructor's type, building off the existing one. Fortunately, 7478 // the only thing of interest in the destructor type is its extended info. 7479 // The return and arguments are fixed. 7480 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 7481 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 7482 epi.NumExceptions = exceptSpec.size(); 7483 epi.Exceptions = exceptSpec.data(); 7484 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 7485 7486 destructor->setType(ty); 7487 7488 // FIXME: If the destructor has a body that could throw, and the newly created 7489 // spec doesn't allow exceptions, we should emit a warning, because this 7490 // change in behavior can break conforming C++03 programs at runtime. 7491 // However, we don't have a body yet, so it needs to be done somewhere else. 7492} 7493 7494/// \brief Builds a statement that copies/moves the given entity from \p From to 7495/// \c To. 7496/// 7497/// This routine is used to copy/move the members of a class with an 7498/// implicitly-declared copy/move assignment operator. When the entities being 7499/// copied are arrays, this routine builds for loops to copy them. 7500/// 7501/// \param S The Sema object used for type-checking. 7502/// 7503/// \param Loc The location where the implicit copy/move is being generated. 7504/// 7505/// \param T The type of the expressions being copied/moved. Both expressions 7506/// must have this type. 7507/// 7508/// \param To The expression we are copying/moving to. 7509/// 7510/// \param From The expression we are copying/moving from. 7511/// 7512/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7513/// Otherwise, it's a non-static member subobject. 7514/// 7515/// \param Copying Whether we're copying or moving. 7516/// 7517/// \param Depth Internal parameter recording the depth of the recursion. 7518/// 7519/// \returns A statement or a loop that copies the expressions. 7520static StmtResult 7521BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7522 Expr *To, Expr *From, 7523 bool CopyingBaseSubobject, bool Copying, 7524 unsigned Depth = 0) { 7525 // C++0x [class.copy]p28: 7526 // Each subobject is assigned in the manner appropriate to its type: 7527 // 7528 // - if the subobject is of class type, as if by a call to operator= with 7529 // the subobject as the object expression and the corresponding 7530 // subobject of x as a single function argument (as if by explicit 7531 // qualification; that is, ignoring any possible virtual overriding 7532 // functions in more derived classes); 7533 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7534 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7535 7536 // Look for operator=. 7537 DeclarationName Name 7538 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7539 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7540 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7541 7542 // Filter out any result that isn't a copy/move-assignment operator. 7543 LookupResult::Filter F = OpLookup.makeFilter(); 7544 while (F.hasNext()) { 7545 NamedDecl *D = F.next(); 7546 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7547 if (Copying ? Method->isCopyAssignmentOperator() : 7548 Method->isMoveAssignmentOperator()) 7549 continue; 7550 7551 F.erase(); 7552 } 7553 F.done(); 7554 7555 // Suppress the protected check (C++ [class.protected]) for each of the 7556 // assignment operators we found. This strange dance is required when 7557 // we're assigning via a base classes's copy-assignment operator. To 7558 // ensure that we're getting the right base class subobject (without 7559 // ambiguities), we need to cast "this" to that subobject type; to 7560 // ensure that we don't go through the virtual call mechanism, we need 7561 // to qualify the operator= name with the base class (see below). However, 7562 // this means that if the base class has a protected copy assignment 7563 // operator, the protected member access check will fail. So, we 7564 // rewrite "protected" access to "public" access in this case, since we 7565 // know by construction that we're calling from a derived class. 7566 if (CopyingBaseSubobject) { 7567 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7568 L != LEnd; ++L) { 7569 if (L.getAccess() == AS_protected) 7570 L.setAccess(AS_public); 7571 } 7572 } 7573 7574 // Create the nested-name-specifier that will be used to qualify the 7575 // reference to operator=; this is required to suppress the virtual 7576 // call mechanism. 7577 CXXScopeSpec SS; 7578 SS.MakeTrivial(S.Context, 7579 NestedNameSpecifier::Create(S.Context, 0, false, 7580 T.getTypePtr()), 7581 Loc); 7582 7583 // Create the reference to operator=. 7584 ExprResult OpEqualRef 7585 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7586 /*FirstQualifierInScope=*/0, OpLookup, 7587 /*TemplateArgs=*/0, 7588 /*SuppressQualifierCheck=*/true); 7589 if (OpEqualRef.isInvalid()) 7590 return StmtError(); 7591 7592 // Build the call to the assignment operator. 7593 7594 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7595 OpEqualRef.takeAs<Expr>(), 7596 Loc, &From, 1, Loc); 7597 if (Call.isInvalid()) 7598 return StmtError(); 7599 7600 return S.Owned(Call.takeAs<Stmt>()); 7601 } 7602 7603 // - if the subobject is of scalar type, the built-in assignment 7604 // operator is used. 7605 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7606 if (!ArrayTy) { 7607 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7608 if (Assignment.isInvalid()) 7609 return StmtError(); 7610 7611 return S.Owned(Assignment.takeAs<Stmt>()); 7612 } 7613 7614 // - if the subobject is an array, each element is assigned, in the 7615 // manner appropriate to the element type; 7616 7617 // Construct a loop over the array bounds, e.g., 7618 // 7619 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7620 // 7621 // that will copy each of the array elements. 7622 QualType SizeType = S.Context.getSizeType(); 7623 7624 // Create the iteration variable. 7625 IdentifierInfo *IterationVarName = 0; 7626 { 7627 llvm::SmallString<8> Str; 7628 llvm::raw_svector_ostream OS(Str); 7629 OS << "__i" << Depth; 7630 IterationVarName = &S.Context.Idents.get(OS.str()); 7631 } 7632 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7633 IterationVarName, SizeType, 7634 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7635 SC_None, SC_None); 7636 7637 // Initialize the iteration variable to zero. 7638 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7639 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7640 7641 // Create a reference to the iteration variable; we'll use this several 7642 // times throughout. 7643 Expr *IterationVarRef 7644 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 7645 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7646 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 7647 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 7648 7649 // Create the DeclStmt that holds the iteration variable. 7650 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7651 7652 // Create the comparison against the array bound. 7653 llvm::APInt Upper 7654 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7655 Expr *Comparison 7656 = new (S.Context) BinaryOperator(IterationVarRefRVal, 7657 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7658 BO_NE, S.Context.BoolTy, 7659 VK_RValue, OK_Ordinary, Loc); 7660 7661 // Create the pre-increment of the iteration variable. 7662 Expr *Increment 7663 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7664 VK_LValue, OK_Ordinary, Loc); 7665 7666 // Subscript the "from" and "to" expressions with the iteration variable. 7667 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7668 IterationVarRefRVal, 7669 Loc)); 7670 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7671 IterationVarRefRVal, 7672 Loc)); 7673 if (!Copying) // Cast to rvalue 7674 From = CastForMoving(S, From); 7675 7676 // Build the copy/move for an individual element of the array. 7677 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7678 To, From, CopyingBaseSubobject, 7679 Copying, Depth + 1); 7680 if (Copy.isInvalid()) 7681 return StmtError(); 7682 7683 // Construct the loop that copies all elements of this array. 7684 return S.ActOnForStmt(Loc, Loc, InitStmt, 7685 S.MakeFullExpr(Comparison), 7686 0, S.MakeFullExpr(Increment), 7687 Loc, Copy.take()); 7688} 7689 7690std::pair<Sema::ImplicitExceptionSpecification, bool> 7691Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7692 CXXRecordDecl *ClassDecl) { 7693 if (ClassDecl->isInvalidDecl()) 7694 return std::make_pair(ImplicitExceptionSpecification(Context), false); 7695 7696 // C++ [class.copy]p10: 7697 // If the class definition does not explicitly declare a copy 7698 // assignment operator, one is declared implicitly. 7699 // The implicitly-defined copy assignment operator for a class X 7700 // will have the form 7701 // 7702 // X& X::operator=(const X&) 7703 // 7704 // if 7705 bool HasConstCopyAssignment = true; 7706 7707 // -- each direct base class B of X has a copy assignment operator 7708 // whose parameter is of type const B&, const volatile B& or B, 7709 // and 7710 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7711 BaseEnd = ClassDecl->bases_end(); 7712 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7713 // We'll handle this below 7714 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7715 continue; 7716 7717 assert(!Base->getType()->isDependentType() && 7718 "Cannot generate implicit members for class with dependent bases."); 7719 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7720 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7721 &HasConstCopyAssignment); 7722 } 7723 7724 // In C++11, the above citation has "or virtual" added 7725 if (LangOpts.CPlusPlus0x) { 7726 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7727 BaseEnd = ClassDecl->vbases_end(); 7728 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7729 assert(!Base->getType()->isDependentType() && 7730 "Cannot generate implicit members for class with dependent bases."); 7731 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7732 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7733 &HasConstCopyAssignment); 7734 } 7735 } 7736 7737 // -- for all the nonstatic data members of X that are of a class 7738 // type M (or array thereof), each such class type has a copy 7739 // assignment operator whose parameter is of type const M&, 7740 // const volatile M& or M. 7741 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7742 FieldEnd = ClassDecl->field_end(); 7743 HasConstCopyAssignment && Field != FieldEnd; 7744 ++Field) { 7745 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7746 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7747 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 7748 &HasConstCopyAssignment); 7749 } 7750 } 7751 7752 // Otherwise, the implicitly declared copy assignment operator will 7753 // have the form 7754 // 7755 // X& X::operator=(X&) 7756 7757 // C++ [except.spec]p14: 7758 // An implicitly declared special member function (Clause 12) shall have an 7759 // exception-specification. [...] 7760 7761 // It is unspecified whether or not an implicit copy assignment operator 7762 // attempts to deduplicate calls to assignment operators of virtual bases are 7763 // made. As such, this exception specification is effectively unspecified. 7764 // Based on a similar decision made for constness in C++0x, we're erring on 7765 // the side of assuming such calls to be made regardless of whether they 7766 // actually happen. 7767 ImplicitExceptionSpecification ExceptSpec(Context); 7768 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7769 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7770 BaseEnd = ClassDecl->bases_end(); 7771 Base != BaseEnd; ++Base) { 7772 if (Base->isVirtual()) 7773 continue; 7774 7775 CXXRecordDecl *BaseClassDecl 7776 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7777 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7778 ArgQuals, false, 0)) 7779 ExceptSpec.CalledDecl(CopyAssign); 7780 } 7781 7782 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7783 BaseEnd = ClassDecl->vbases_end(); 7784 Base != BaseEnd; ++Base) { 7785 CXXRecordDecl *BaseClassDecl 7786 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7787 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7788 ArgQuals, false, 0)) 7789 ExceptSpec.CalledDecl(CopyAssign); 7790 } 7791 7792 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7793 FieldEnd = ClassDecl->field_end(); 7794 Field != FieldEnd; 7795 ++Field) { 7796 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7797 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7798 if (CXXMethodDecl *CopyAssign = 7799 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7800 ExceptSpec.CalledDecl(CopyAssign); 7801 } 7802 } 7803 7804 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7805} 7806 7807CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7808 // Note: The following rules are largely analoguous to the copy 7809 // constructor rules. Note that virtual bases are not taken into account 7810 // for determining the argument type of the operator. Note also that 7811 // operators taking an object instead of a reference are allowed. 7812 7813 ImplicitExceptionSpecification Spec(Context); 7814 bool Const; 7815 llvm::tie(Spec, Const) = 7816 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7817 7818 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7819 QualType RetType = Context.getLValueReferenceType(ArgType); 7820 if (Const) 7821 ArgType = ArgType.withConst(); 7822 ArgType = Context.getLValueReferenceType(ArgType); 7823 7824 // An implicitly-declared copy assignment operator is an inline public 7825 // member of its class. 7826 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7827 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7828 SourceLocation ClassLoc = ClassDecl->getLocation(); 7829 DeclarationNameInfo NameInfo(Name, ClassLoc); 7830 CXXMethodDecl *CopyAssignment 7831 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7832 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7833 /*TInfo=*/0, /*isStatic=*/false, 7834 /*StorageClassAsWritten=*/SC_None, 7835 /*isInline=*/true, /*isConstexpr=*/false, 7836 SourceLocation()); 7837 CopyAssignment->setAccess(AS_public); 7838 CopyAssignment->setDefaulted(); 7839 CopyAssignment->setImplicit(); 7840 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7841 7842 // Add the parameter to the operator. 7843 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7844 ClassLoc, ClassLoc, /*Id=*/0, 7845 ArgType, /*TInfo=*/0, 7846 SC_None, 7847 SC_None, 0); 7848 CopyAssignment->setParams(FromParam); 7849 7850 // Note that we have added this copy-assignment operator. 7851 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7852 7853 if (Scope *S = getScopeForContext(ClassDecl)) 7854 PushOnScopeChains(CopyAssignment, S, false); 7855 ClassDecl->addDecl(CopyAssignment); 7856 7857 // C++0x [class.copy]p19: 7858 // .... If the class definition does not explicitly declare a copy 7859 // assignment operator, there is no user-declared move constructor, and 7860 // there is no user-declared move assignment operator, a copy assignment 7861 // operator is implicitly declared as defaulted. 7862 if ((ClassDecl->hasUserDeclaredMoveConstructor() && 7863 !getLangOptions().MicrosoftMode) || 7864 ClassDecl->hasUserDeclaredMoveAssignment() || 7865 ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 7866 CopyAssignment->setDeletedAsWritten(); 7867 7868 AddOverriddenMethods(ClassDecl, CopyAssignment); 7869 return CopyAssignment; 7870} 7871 7872void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7873 CXXMethodDecl *CopyAssignOperator) { 7874 assert((CopyAssignOperator->isDefaulted() && 7875 CopyAssignOperator->isOverloadedOperator() && 7876 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7877 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 7878 "DefineImplicitCopyAssignment called for wrong function"); 7879 7880 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7881 7882 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7883 CopyAssignOperator->setInvalidDecl(); 7884 return; 7885 } 7886 7887 CopyAssignOperator->setUsed(); 7888 7889 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7890 DiagnosticErrorTrap Trap(Diags); 7891 7892 // C++0x [class.copy]p30: 7893 // The implicitly-defined or explicitly-defaulted copy assignment operator 7894 // for a non-union class X performs memberwise copy assignment of its 7895 // subobjects. The direct base classes of X are assigned first, in the 7896 // order of their declaration in the base-specifier-list, and then the 7897 // immediate non-static data members of X are assigned, in the order in 7898 // which they were declared in the class definition. 7899 7900 // The statements that form the synthesized function body. 7901 ASTOwningVector<Stmt*> Statements(*this); 7902 7903 // The parameter for the "other" object, which we are copying from. 7904 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7905 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7906 QualType OtherRefType = Other->getType(); 7907 if (const LValueReferenceType *OtherRef 7908 = OtherRefType->getAs<LValueReferenceType>()) { 7909 OtherRefType = OtherRef->getPointeeType(); 7910 OtherQuals = OtherRefType.getQualifiers(); 7911 } 7912 7913 // Our location for everything implicitly-generated. 7914 SourceLocation Loc = CopyAssignOperator->getLocation(); 7915 7916 // Construct a reference to the "other" object. We'll be using this 7917 // throughout the generated ASTs. 7918 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7919 assert(OtherRef && "Reference to parameter cannot fail!"); 7920 7921 // Construct the "this" pointer. We'll be using this throughout the generated 7922 // ASTs. 7923 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7924 assert(This && "Reference to this cannot fail!"); 7925 7926 // Assign base classes. 7927 bool Invalid = false; 7928 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7929 E = ClassDecl->bases_end(); Base != E; ++Base) { 7930 // Form the assignment: 7931 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7932 QualType BaseType = Base->getType().getUnqualifiedType(); 7933 if (!BaseType->isRecordType()) { 7934 Invalid = true; 7935 continue; 7936 } 7937 7938 CXXCastPath BasePath; 7939 BasePath.push_back(Base); 7940 7941 // Construct the "from" expression, which is an implicit cast to the 7942 // appropriately-qualified base type. 7943 Expr *From = OtherRef; 7944 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7945 CK_UncheckedDerivedToBase, 7946 VK_LValue, &BasePath).take(); 7947 7948 // Dereference "this". 7949 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7950 7951 // Implicitly cast "this" to the appropriately-qualified base type. 7952 To = ImpCastExprToType(To.take(), 7953 Context.getCVRQualifiedType(BaseType, 7954 CopyAssignOperator->getTypeQualifiers()), 7955 CK_UncheckedDerivedToBase, 7956 VK_LValue, &BasePath); 7957 7958 // Build the copy. 7959 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7960 To.get(), From, 7961 /*CopyingBaseSubobject=*/true, 7962 /*Copying=*/true); 7963 if (Copy.isInvalid()) { 7964 Diag(CurrentLocation, diag::note_member_synthesized_at) 7965 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7966 CopyAssignOperator->setInvalidDecl(); 7967 return; 7968 } 7969 7970 // Success! Record the copy. 7971 Statements.push_back(Copy.takeAs<Expr>()); 7972 } 7973 7974 // \brief Reference to the __builtin_memcpy function. 7975 Expr *BuiltinMemCpyRef = 0; 7976 // \brief Reference to the __builtin_objc_memmove_collectable function. 7977 Expr *CollectableMemCpyRef = 0; 7978 7979 // Assign non-static members. 7980 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7981 FieldEnd = ClassDecl->field_end(); 7982 Field != FieldEnd; ++Field) { 7983 if (Field->isUnnamedBitfield()) 7984 continue; 7985 7986 // Check for members of reference type; we can't copy those. 7987 if (Field->getType()->isReferenceType()) { 7988 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7989 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7990 Diag(Field->getLocation(), diag::note_declared_at); 7991 Diag(CurrentLocation, diag::note_member_synthesized_at) 7992 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7993 Invalid = true; 7994 continue; 7995 } 7996 7997 // Check for members of const-qualified, non-class type. 7998 QualType BaseType = Context.getBaseElementType(Field->getType()); 7999 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8000 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8001 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8002 Diag(Field->getLocation(), diag::note_declared_at); 8003 Diag(CurrentLocation, diag::note_member_synthesized_at) 8004 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8005 Invalid = true; 8006 continue; 8007 } 8008 8009 // Suppress assigning zero-width bitfields. 8010 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8011 continue; 8012 8013 QualType FieldType = Field->getType().getNonReferenceType(); 8014 if (FieldType->isIncompleteArrayType()) { 8015 assert(ClassDecl->hasFlexibleArrayMember() && 8016 "Incomplete array type is not valid"); 8017 continue; 8018 } 8019 8020 // Build references to the field in the object we're copying from and to. 8021 CXXScopeSpec SS; // Intentionally empty 8022 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8023 LookupMemberName); 8024 MemberLookup.addDecl(*Field); 8025 MemberLookup.resolveKind(); 8026 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8027 Loc, /*IsArrow=*/false, 8028 SS, 0, MemberLookup, 0); 8029 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8030 Loc, /*IsArrow=*/true, 8031 SS, 0, MemberLookup, 0); 8032 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8033 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8034 8035 // If the field should be copied with __builtin_memcpy rather than via 8036 // explicit assignments, do so. This optimization only applies for arrays 8037 // of scalars and arrays of class type with trivial copy-assignment 8038 // operators. 8039 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8040 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 8041 // Compute the size of the memory buffer to be copied. 8042 QualType SizeType = Context.getSizeType(); 8043 llvm::APInt Size(Context.getTypeSize(SizeType), 8044 Context.getTypeSizeInChars(BaseType).getQuantity()); 8045 for (const ConstantArrayType *Array 8046 = Context.getAsConstantArrayType(FieldType); 8047 Array; 8048 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8049 llvm::APInt ArraySize 8050 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8051 Size *= ArraySize; 8052 } 8053 8054 // Take the address of the field references for "from" and "to". 8055 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 8056 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 8057 8058 bool NeedsCollectableMemCpy = 8059 (BaseType->isRecordType() && 8060 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8061 8062 if (NeedsCollectableMemCpy) { 8063 if (!CollectableMemCpyRef) { 8064 // Create a reference to the __builtin_objc_memmove_collectable function. 8065 LookupResult R(*this, 8066 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8067 Loc, LookupOrdinaryName); 8068 LookupName(R, TUScope, true); 8069 8070 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8071 if (!CollectableMemCpy) { 8072 // Something went horribly wrong earlier, and we will have 8073 // complained about it. 8074 Invalid = true; 8075 continue; 8076 } 8077 8078 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8079 CollectableMemCpy->getType(), 8080 VK_LValue, Loc, 0).take(); 8081 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8082 } 8083 } 8084 // Create a reference to the __builtin_memcpy builtin function. 8085 else if (!BuiltinMemCpyRef) { 8086 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8087 LookupOrdinaryName); 8088 LookupName(R, TUScope, true); 8089 8090 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8091 if (!BuiltinMemCpy) { 8092 // Something went horribly wrong earlier, and we will have complained 8093 // about it. 8094 Invalid = true; 8095 continue; 8096 } 8097 8098 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8099 BuiltinMemCpy->getType(), 8100 VK_LValue, Loc, 0).take(); 8101 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8102 } 8103 8104 ASTOwningVector<Expr*> CallArgs(*this); 8105 CallArgs.push_back(To.takeAs<Expr>()); 8106 CallArgs.push_back(From.takeAs<Expr>()); 8107 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8108 ExprResult Call = ExprError(); 8109 if (NeedsCollectableMemCpy) 8110 Call = ActOnCallExpr(/*Scope=*/0, 8111 CollectableMemCpyRef, 8112 Loc, move_arg(CallArgs), 8113 Loc); 8114 else 8115 Call = ActOnCallExpr(/*Scope=*/0, 8116 BuiltinMemCpyRef, 8117 Loc, move_arg(CallArgs), 8118 Loc); 8119 8120 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8121 Statements.push_back(Call.takeAs<Expr>()); 8122 continue; 8123 } 8124 8125 // Build the copy of this field. 8126 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 8127 To.get(), From.get(), 8128 /*CopyingBaseSubobject=*/false, 8129 /*Copying=*/true); 8130 if (Copy.isInvalid()) { 8131 Diag(CurrentLocation, diag::note_member_synthesized_at) 8132 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8133 CopyAssignOperator->setInvalidDecl(); 8134 return; 8135 } 8136 8137 // Success! Record the copy. 8138 Statements.push_back(Copy.takeAs<Stmt>()); 8139 } 8140 8141 if (!Invalid) { 8142 // Add a "return *this;" 8143 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8144 8145 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8146 if (Return.isInvalid()) 8147 Invalid = true; 8148 else { 8149 Statements.push_back(Return.takeAs<Stmt>()); 8150 8151 if (Trap.hasErrorOccurred()) { 8152 Diag(CurrentLocation, diag::note_member_synthesized_at) 8153 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8154 Invalid = true; 8155 } 8156 } 8157 } 8158 8159 if (Invalid) { 8160 CopyAssignOperator->setInvalidDecl(); 8161 return; 8162 } 8163 8164 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8165 /*isStmtExpr=*/false); 8166 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8167 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 8168 8169 if (ASTMutationListener *L = getASTMutationListener()) { 8170 L->CompletedImplicitDefinition(CopyAssignOperator); 8171 } 8172} 8173 8174Sema::ImplicitExceptionSpecification 8175Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 8176 ImplicitExceptionSpecification ExceptSpec(Context); 8177 8178 if (ClassDecl->isInvalidDecl()) 8179 return ExceptSpec; 8180 8181 // C++0x [except.spec]p14: 8182 // An implicitly declared special member function (Clause 12) shall have an 8183 // exception-specification. [...] 8184 8185 // It is unspecified whether or not an implicit move assignment operator 8186 // attempts to deduplicate calls to assignment operators of virtual bases are 8187 // made. As such, this exception specification is effectively unspecified. 8188 // Based on a similar decision made for constness in C++0x, we're erring on 8189 // the side of assuming such calls to be made regardless of whether they 8190 // actually happen. 8191 // Note that a move constructor is not implicitly declared when there are 8192 // virtual bases, but it can still be user-declared and explicitly defaulted. 8193 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8194 BaseEnd = ClassDecl->bases_end(); 8195 Base != BaseEnd; ++Base) { 8196 if (Base->isVirtual()) 8197 continue; 8198 8199 CXXRecordDecl *BaseClassDecl 8200 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8201 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8202 false, 0)) 8203 ExceptSpec.CalledDecl(MoveAssign); 8204 } 8205 8206 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8207 BaseEnd = ClassDecl->vbases_end(); 8208 Base != BaseEnd; ++Base) { 8209 CXXRecordDecl *BaseClassDecl 8210 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8211 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8212 false, 0)) 8213 ExceptSpec.CalledDecl(MoveAssign); 8214 } 8215 8216 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8217 FieldEnd = ClassDecl->field_end(); 8218 Field != FieldEnd; 8219 ++Field) { 8220 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8221 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8222 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 8223 false, 0)) 8224 ExceptSpec.CalledDecl(MoveAssign); 8225 } 8226 } 8227 8228 return ExceptSpec; 8229} 8230 8231CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8232 // Note: The following rules are largely analoguous to the move 8233 // constructor rules. 8234 8235 ImplicitExceptionSpecification Spec( 8236 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 8237 8238 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8239 QualType RetType = Context.getLValueReferenceType(ArgType); 8240 ArgType = Context.getRValueReferenceType(ArgType); 8241 8242 // An implicitly-declared move assignment operator is an inline public 8243 // member of its class. 8244 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8245 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8246 SourceLocation ClassLoc = ClassDecl->getLocation(); 8247 DeclarationNameInfo NameInfo(Name, ClassLoc); 8248 CXXMethodDecl *MoveAssignment 8249 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8250 Context.getFunctionType(RetType, &ArgType, 1, EPI), 8251 /*TInfo=*/0, /*isStatic=*/false, 8252 /*StorageClassAsWritten=*/SC_None, 8253 /*isInline=*/true, 8254 /*isConstexpr=*/false, 8255 SourceLocation()); 8256 MoveAssignment->setAccess(AS_public); 8257 MoveAssignment->setDefaulted(); 8258 MoveAssignment->setImplicit(); 8259 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8260 8261 // Add the parameter to the operator. 8262 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8263 ClassLoc, ClassLoc, /*Id=*/0, 8264 ArgType, /*TInfo=*/0, 8265 SC_None, 8266 SC_None, 0); 8267 MoveAssignment->setParams(FromParam); 8268 8269 // Note that we have added this copy-assignment operator. 8270 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8271 8272 // C++0x [class.copy]p9: 8273 // If the definition of a class X does not explicitly declare a move 8274 // assignment operator, one will be implicitly declared as defaulted if and 8275 // only if: 8276 // [...] 8277 // - the move assignment operator would not be implicitly defined as 8278 // deleted. 8279 if (ShouldDeleteMoveAssignmentOperator(MoveAssignment)) { 8280 // Cache this result so that we don't try to generate this over and over 8281 // on every lookup, leaking memory and wasting time. 8282 ClassDecl->setFailedImplicitMoveAssignment(); 8283 return 0; 8284 } 8285 8286 if (Scope *S = getScopeForContext(ClassDecl)) 8287 PushOnScopeChains(MoveAssignment, S, false); 8288 ClassDecl->addDecl(MoveAssignment); 8289 8290 AddOverriddenMethods(ClassDecl, MoveAssignment); 8291 return MoveAssignment; 8292} 8293 8294void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8295 CXXMethodDecl *MoveAssignOperator) { 8296 assert((MoveAssignOperator->isDefaulted() && 8297 MoveAssignOperator->isOverloadedOperator() && 8298 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8299 !MoveAssignOperator->doesThisDeclarationHaveABody()) && 8300 "DefineImplicitMoveAssignment called for wrong function"); 8301 8302 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8303 8304 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8305 MoveAssignOperator->setInvalidDecl(); 8306 return; 8307 } 8308 8309 MoveAssignOperator->setUsed(); 8310 8311 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8312 DiagnosticErrorTrap Trap(Diags); 8313 8314 // C++0x [class.copy]p28: 8315 // The implicitly-defined or move assignment operator for a non-union class 8316 // X performs memberwise move assignment of its subobjects. The direct base 8317 // classes of X are assigned first, in the order of their declaration in the 8318 // base-specifier-list, and then the immediate non-static data members of X 8319 // are assigned, in the order in which they were declared in the class 8320 // definition. 8321 8322 // The statements that form the synthesized function body. 8323 ASTOwningVector<Stmt*> Statements(*this); 8324 8325 // The parameter for the "other" object, which we are move from. 8326 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8327 QualType OtherRefType = Other->getType()-> 8328 getAs<RValueReferenceType>()->getPointeeType(); 8329 assert(OtherRefType.getQualifiers() == 0 && 8330 "Bad argument type of defaulted move assignment"); 8331 8332 // Our location for everything implicitly-generated. 8333 SourceLocation Loc = MoveAssignOperator->getLocation(); 8334 8335 // Construct a reference to the "other" object. We'll be using this 8336 // throughout the generated ASTs. 8337 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8338 assert(OtherRef && "Reference to parameter cannot fail!"); 8339 // Cast to rvalue. 8340 OtherRef = CastForMoving(*this, OtherRef); 8341 8342 // Construct the "this" pointer. We'll be using this throughout the generated 8343 // ASTs. 8344 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8345 assert(This && "Reference to this cannot fail!"); 8346 8347 // Assign base classes. 8348 bool Invalid = false; 8349 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8350 E = ClassDecl->bases_end(); Base != E; ++Base) { 8351 // Form the assignment: 8352 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8353 QualType BaseType = Base->getType().getUnqualifiedType(); 8354 if (!BaseType->isRecordType()) { 8355 Invalid = true; 8356 continue; 8357 } 8358 8359 CXXCastPath BasePath; 8360 BasePath.push_back(Base); 8361 8362 // Construct the "from" expression, which is an implicit cast to the 8363 // appropriately-qualified base type. 8364 Expr *From = OtherRef; 8365 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8366 VK_XValue, &BasePath).take(); 8367 8368 // Dereference "this". 8369 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8370 8371 // Implicitly cast "this" to the appropriately-qualified base type. 8372 To = ImpCastExprToType(To.take(), 8373 Context.getCVRQualifiedType(BaseType, 8374 MoveAssignOperator->getTypeQualifiers()), 8375 CK_UncheckedDerivedToBase, 8376 VK_LValue, &BasePath); 8377 8378 // Build the move. 8379 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8380 To.get(), From, 8381 /*CopyingBaseSubobject=*/true, 8382 /*Copying=*/false); 8383 if (Move.isInvalid()) { 8384 Diag(CurrentLocation, diag::note_member_synthesized_at) 8385 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8386 MoveAssignOperator->setInvalidDecl(); 8387 return; 8388 } 8389 8390 // Success! Record the move. 8391 Statements.push_back(Move.takeAs<Expr>()); 8392 } 8393 8394 // \brief Reference to the __builtin_memcpy function. 8395 Expr *BuiltinMemCpyRef = 0; 8396 // \brief Reference to the __builtin_objc_memmove_collectable function. 8397 Expr *CollectableMemCpyRef = 0; 8398 8399 // Assign non-static members. 8400 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8401 FieldEnd = ClassDecl->field_end(); 8402 Field != FieldEnd; ++Field) { 8403 if (Field->isUnnamedBitfield()) 8404 continue; 8405 8406 // Check for members of reference type; we can't move those. 8407 if (Field->getType()->isReferenceType()) { 8408 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8409 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8410 Diag(Field->getLocation(), diag::note_declared_at); 8411 Diag(CurrentLocation, diag::note_member_synthesized_at) 8412 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8413 Invalid = true; 8414 continue; 8415 } 8416 8417 // Check for members of const-qualified, non-class type. 8418 QualType BaseType = Context.getBaseElementType(Field->getType()); 8419 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8420 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8421 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8422 Diag(Field->getLocation(), diag::note_declared_at); 8423 Diag(CurrentLocation, diag::note_member_synthesized_at) 8424 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8425 Invalid = true; 8426 continue; 8427 } 8428 8429 // Suppress assigning zero-width bitfields. 8430 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8431 continue; 8432 8433 QualType FieldType = Field->getType().getNonReferenceType(); 8434 if (FieldType->isIncompleteArrayType()) { 8435 assert(ClassDecl->hasFlexibleArrayMember() && 8436 "Incomplete array type is not valid"); 8437 continue; 8438 } 8439 8440 // Build references to the field in the object we're copying from and to. 8441 CXXScopeSpec SS; // Intentionally empty 8442 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8443 LookupMemberName); 8444 MemberLookup.addDecl(*Field); 8445 MemberLookup.resolveKind(); 8446 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8447 Loc, /*IsArrow=*/false, 8448 SS, 0, MemberLookup, 0); 8449 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8450 Loc, /*IsArrow=*/true, 8451 SS, 0, MemberLookup, 0); 8452 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8453 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8454 8455 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8456 "Member reference with rvalue base must be rvalue except for reference " 8457 "members, which aren't allowed for move assignment."); 8458 8459 // If the field should be copied with __builtin_memcpy rather than via 8460 // explicit assignments, do so. This optimization only applies for arrays 8461 // of scalars and arrays of class type with trivial move-assignment 8462 // operators. 8463 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8464 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8465 // Compute the size of the memory buffer to be copied. 8466 QualType SizeType = Context.getSizeType(); 8467 llvm::APInt Size(Context.getTypeSize(SizeType), 8468 Context.getTypeSizeInChars(BaseType).getQuantity()); 8469 for (const ConstantArrayType *Array 8470 = Context.getAsConstantArrayType(FieldType); 8471 Array; 8472 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8473 llvm::APInt ArraySize 8474 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8475 Size *= ArraySize; 8476 } 8477 8478 // Take the address of the field references for "from" and "to". We 8479 // directly construct UnaryOperators here because semantic analysis 8480 // does not permit us to take the address of an xvalue. 8481 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8482 Context.getPointerType(From.get()->getType()), 8483 VK_RValue, OK_Ordinary, Loc); 8484 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8485 Context.getPointerType(To.get()->getType()), 8486 VK_RValue, OK_Ordinary, Loc); 8487 8488 bool NeedsCollectableMemCpy = 8489 (BaseType->isRecordType() && 8490 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8491 8492 if (NeedsCollectableMemCpy) { 8493 if (!CollectableMemCpyRef) { 8494 // Create a reference to the __builtin_objc_memmove_collectable function. 8495 LookupResult R(*this, 8496 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8497 Loc, LookupOrdinaryName); 8498 LookupName(R, TUScope, true); 8499 8500 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8501 if (!CollectableMemCpy) { 8502 // Something went horribly wrong earlier, and we will have 8503 // complained about it. 8504 Invalid = true; 8505 continue; 8506 } 8507 8508 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8509 CollectableMemCpy->getType(), 8510 VK_LValue, Loc, 0).take(); 8511 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8512 } 8513 } 8514 // Create a reference to the __builtin_memcpy builtin function. 8515 else if (!BuiltinMemCpyRef) { 8516 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8517 LookupOrdinaryName); 8518 LookupName(R, TUScope, true); 8519 8520 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8521 if (!BuiltinMemCpy) { 8522 // Something went horribly wrong earlier, and we will have complained 8523 // about it. 8524 Invalid = true; 8525 continue; 8526 } 8527 8528 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8529 BuiltinMemCpy->getType(), 8530 VK_LValue, Loc, 0).take(); 8531 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8532 } 8533 8534 ASTOwningVector<Expr*> CallArgs(*this); 8535 CallArgs.push_back(To.takeAs<Expr>()); 8536 CallArgs.push_back(From.takeAs<Expr>()); 8537 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8538 ExprResult Call = ExprError(); 8539 if (NeedsCollectableMemCpy) 8540 Call = ActOnCallExpr(/*Scope=*/0, 8541 CollectableMemCpyRef, 8542 Loc, move_arg(CallArgs), 8543 Loc); 8544 else 8545 Call = ActOnCallExpr(/*Scope=*/0, 8546 BuiltinMemCpyRef, 8547 Loc, move_arg(CallArgs), 8548 Loc); 8549 8550 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8551 Statements.push_back(Call.takeAs<Expr>()); 8552 continue; 8553 } 8554 8555 // Build the move of this field. 8556 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8557 To.get(), From.get(), 8558 /*CopyingBaseSubobject=*/false, 8559 /*Copying=*/false); 8560 if (Move.isInvalid()) { 8561 Diag(CurrentLocation, diag::note_member_synthesized_at) 8562 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8563 MoveAssignOperator->setInvalidDecl(); 8564 return; 8565 } 8566 8567 // Success! Record the copy. 8568 Statements.push_back(Move.takeAs<Stmt>()); 8569 } 8570 8571 if (!Invalid) { 8572 // Add a "return *this;" 8573 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8574 8575 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8576 if (Return.isInvalid()) 8577 Invalid = true; 8578 else { 8579 Statements.push_back(Return.takeAs<Stmt>()); 8580 8581 if (Trap.hasErrorOccurred()) { 8582 Diag(CurrentLocation, diag::note_member_synthesized_at) 8583 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8584 Invalid = true; 8585 } 8586 } 8587 } 8588 8589 if (Invalid) { 8590 MoveAssignOperator->setInvalidDecl(); 8591 return; 8592 } 8593 8594 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8595 /*isStmtExpr=*/false); 8596 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8597 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8598 8599 if (ASTMutationListener *L = getASTMutationListener()) { 8600 L->CompletedImplicitDefinition(MoveAssignOperator); 8601 } 8602} 8603 8604std::pair<Sema::ImplicitExceptionSpecification, bool> 8605Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8606 if (ClassDecl->isInvalidDecl()) 8607 return std::make_pair(ImplicitExceptionSpecification(Context), false); 8608 8609 // C++ [class.copy]p5: 8610 // The implicitly-declared copy constructor for a class X will 8611 // have the form 8612 // 8613 // X::X(const X&) 8614 // 8615 // if 8616 // FIXME: It ought to be possible to store this on the record. 8617 bool HasConstCopyConstructor = true; 8618 8619 // -- each direct or virtual base class B of X has a copy 8620 // constructor whose first parameter is of type const B& or 8621 // const volatile B&, and 8622 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8623 BaseEnd = ClassDecl->bases_end(); 8624 HasConstCopyConstructor && Base != BaseEnd; 8625 ++Base) { 8626 // Virtual bases are handled below. 8627 if (Base->isVirtual()) 8628 continue; 8629 8630 CXXRecordDecl *BaseClassDecl 8631 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8632 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8633 &HasConstCopyConstructor); 8634 } 8635 8636 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8637 BaseEnd = ClassDecl->vbases_end(); 8638 HasConstCopyConstructor && Base != BaseEnd; 8639 ++Base) { 8640 CXXRecordDecl *BaseClassDecl 8641 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8642 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8643 &HasConstCopyConstructor); 8644 } 8645 8646 // -- for all the nonstatic data members of X that are of a 8647 // class type M (or array thereof), each such class type 8648 // has a copy constructor whose first parameter is of type 8649 // const M& or const volatile M&. 8650 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8651 FieldEnd = ClassDecl->field_end(); 8652 HasConstCopyConstructor && Field != FieldEnd; 8653 ++Field) { 8654 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8655 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8656 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 8657 &HasConstCopyConstructor); 8658 } 8659 } 8660 // Otherwise, the implicitly declared copy constructor will have 8661 // the form 8662 // 8663 // X::X(X&) 8664 8665 // C++ [except.spec]p14: 8666 // An implicitly declared special member function (Clause 12) shall have an 8667 // exception-specification. [...] 8668 ImplicitExceptionSpecification ExceptSpec(Context); 8669 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8670 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8671 BaseEnd = ClassDecl->bases_end(); 8672 Base != BaseEnd; 8673 ++Base) { 8674 // Virtual bases are handled below. 8675 if (Base->isVirtual()) 8676 continue; 8677 8678 CXXRecordDecl *BaseClassDecl 8679 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8680 if (CXXConstructorDecl *CopyConstructor = 8681 LookupCopyingConstructor(BaseClassDecl, Quals)) 8682 ExceptSpec.CalledDecl(CopyConstructor); 8683 } 8684 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8685 BaseEnd = ClassDecl->vbases_end(); 8686 Base != BaseEnd; 8687 ++Base) { 8688 CXXRecordDecl *BaseClassDecl 8689 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8690 if (CXXConstructorDecl *CopyConstructor = 8691 LookupCopyingConstructor(BaseClassDecl, Quals)) 8692 ExceptSpec.CalledDecl(CopyConstructor); 8693 } 8694 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8695 FieldEnd = ClassDecl->field_end(); 8696 Field != FieldEnd; 8697 ++Field) { 8698 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8699 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8700 if (CXXConstructorDecl *CopyConstructor = 8701 LookupCopyingConstructor(FieldClassDecl, Quals)) 8702 ExceptSpec.CalledDecl(CopyConstructor); 8703 } 8704 } 8705 8706 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8707} 8708 8709CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8710 CXXRecordDecl *ClassDecl) { 8711 // C++ [class.copy]p4: 8712 // If the class definition does not explicitly declare a copy 8713 // constructor, one is declared implicitly. 8714 8715 ImplicitExceptionSpecification Spec(Context); 8716 bool Const; 8717 llvm::tie(Spec, Const) = 8718 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8719 8720 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8721 QualType ArgType = ClassType; 8722 if (Const) 8723 ArgType = ArgType.withConst(); 8724 ArgType = Context.getLValueReferenceType(ArgType); 8725 8726 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8727 8728 DeclarationName Name 8729 = Context.DeclarationNames.getCXXConstructorName( 8730 Context.getCanonicalType(ClassType)); 8731 SourceLocation ClassLoc = ClassDecl->getLocation(); 8732 DeclarationNameInfo NameInfo(Name, ClassLoc); 8733 8734 // An implicitly-declared copy constructor is an inline public 8735 // member of its class. 8736 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8737 Context, ClassDecl, ClassLoc, NameInfo, 8738 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8739 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8740 /*isConstexpr=*/ClassDecl->defaultedCopyConstructorIsConstexpr() && 8741 getLangOptions().CPlusPlus0x); 8742 CopyConstructor->setAccess(AS_public); 8743 CopyConstructor->setDefaulted(); 8744 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8745 8746 // Note that we have declared this constructor. 8747 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8748 8749 // Add the parameter to the constructor. 8750 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8751 ClassLoc, ClassLoc, 8752 /*IdentifierInfo=*/0, 8753 ArgType, /*TInfo=*/0, 8754 SC_None, 8755 SC_None, 0); 8756 CopyConstructor->setParams(FromParam); 8757 8758 if (Scope *S = getScopeForContext(ClassDecl)) 8759 PushOnScopeChains(CopyConstructor, S, false); 8760 ClassDecl->addDecl(CopyConstructor); 8761 8762 // C++11 [class.copy]p8: 8763 // ... If the class definition does not explicitly declare a copy 8764 // constructor, there is no user-declared move constructor, and there is no 8765 // user-declared move assignment operator, a copy constructor is implicitly 8766 // declared as defaulted. 8767 if (ClassDecl->hasUserDeclaredMoveConstructor() || 8768 (ClassDecl->hasUserDeclaredMoveAssignment() && 8769 !getLangOptions().MicrosoftMode) || 8770 ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8771 CopyConstructor->setDeletedAsWritten(); 8772 8773 return CopyConstructor; 8774} 8775 8776void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8777 CXXConstructorDecl *CopyConstructor) { 8778 assert((CopyConstructor->isDefaulted() && 8779 CopyConstructor->isCopyConstructor() && 8780 !CopyConstructor->doesThisDeclarationHaveABody()) && 8781 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8782 8783 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8784 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8785 8786 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8787 DiagnosticErrorTrap Trap(Diags); 8788 8789 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8790 Trap.hasErrorOccurred()) { 8791 Diag(CurrentLocation, diag::note_member_synthesized_at) 8792 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8793 CopyConstructor->setInvalidDecl(); 8794 } else { 8795 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8796 CopyConstructor->getLocation(), 8797 MultiStmtArg(*this, 0, 0), 8798 /*isStmtExpr=*/false) 8799 .takeAs<Stmt>()); 8800 CopyConstructor->setImplicitlyDefined(true); 8801 } 8802 8803 CopyConstructor->setUsed(); 8804 if (ASTMutationListener *L = getASTMutationListener()) { 8805 L->CompletedImplicitDefinition(CopyConstructor); 8806 } 8807} 8808 8809Sema::ImplicitExceptionSpecification 8810Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8811 // C++ [except.spec]p14: 8812 // An implicitly declared special member function (Clause 12) shall have an 8813 // exception-specification. [...] 8814 ImplicitExceptionSpecification ExceptSpec(Context); 8815 if (ClassDecl->isInvalidDecl()) 8816 return ExceptSpec; 8817 8818 // Direct base-class constructors. 8819 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8820 BEnd = ClassDecl->bases_end(); 8821 B != BEnd; ++B) { 8822 if (B->isVirtual()) // Handled below. 8823 continue; 8824 8825 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8826 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8827 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8828 // If this is a deleted function, add it anyway. This might be conformant 8829 // with the standard. This might not. I'm not sure. It might not matter. 8830 if (Constructor) 8831 ExceptSpec.CalledDecl(Constructor); 8832 } 8833 } 8834 8835 // Virtual base-class constructors. 8836 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8837 BEnd = ClassDecl->vbases_end(); 8838 B != BEnd; ++B) { 8839 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8840 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8841 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8842 // If this is a deleted function, add it anyway. This might be conformant 8843 // with the standard. This might not. I'm not sure. It might not matter. 8844 if (Constructor) 8845 ExceptSpec.CalledDecl(Constructor); 8846 } 8847 } 8848 8849 // Field constructors. 8850 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8851 FEnd = ClassDecl->field_end(); 8852 F != FEnd; ++F) { 8853 if (const RecordType *RecordTy 8854 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8855 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8856 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8857 // If this is a deleted function, add it anyway. This might be conformant 8858 // with the standard. This might not. I'm not sure. It might not matter. 8859 // In particular, the problem is that this function never gets called. It 8860 // might just be ill-formed because this function attempts to refer to 8861 // a deleted function here. 8862 if (Constructor) 8863 ExceptSpec.CalledDecl(Constructor); 8864 } 8865 } 8866 8867 return ExceptSpec; 8868} 8869 8870CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8871 CXXRecordDecl *ClassDecl) { 8872 ImplicitExceptionSpecification Spec( 8873 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8874 8875 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8876 QualType ArgType = Context.getRValueReferenceType(ClassType); 8877 8878 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8879 8880 DeclarationName Name 8881 = Context.DeclarationNames.getCXXConstructorName( 8882 Context.getCanonicalType(ClassType)); 8883 SourceLocation ClassLoc = ClassDecl->getLocation(); 8884 DeclarationNameInfo NameInfo(Name, ClassLoc); 8885 8886 // C++0x [class.copy]p11: 8887 // An implicitly-declared copy/move constructor is an inline public 8888 // member of its class. 8889 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8890 Context, ClassDecl, ClassLoc, NameInfo, 8891 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8892 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8893 /*isConstexpr=*/ClassDecl->defaultedMoveConstructorIsConstexpr() && 8894 getLangOptions().CPlusPlus0x); 8895 MoveConstructor->setAccess(AS_public); 8896 MoveConstructor->setDefaulted(); 8897 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8898 8899 // Add the parameter to the constructor. 8900 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8901 ClassLoc, ClassLoc, 8902 /*IdentifierInfo=*/0, 8903 ArgType, /*TInfo=*/0, 8904 SC_None, 8905 SC_None, 0); 8906 MoveConstructor->setParams(FromParam); 8907 8908 // C++0x [class.copy]p9: 8909 // If the definition of a class X does not explicitly declare a move 8910 // constructor, one will be implicitly declared as defaulted if and only if: 8911 // [...] 8912 // - the move constructor would not be implicitly defined as deleted. 8913 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8914 // Cache this result so that we don't try to generate this over and over 8915 // on every lookup, leaking memory and wasting time. 8916 ClassDecl->setFailedImplicitMoveConstructor(); 8917 return 0; 8918 } 8919 8920 // Note that we have declared this constructor. 8921 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8922 8923 if (Scope *S = getScopeForContext(ClassDecl)) 8924 PushOnScopeChains(MoveConstructor, S, false); 8925 ClassDecl->addDecl(MoveConstructor); 8926 8927 return MoveConstructor; 8928} 8929 8930void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8931 CXXConstructorDecl *MoveConstructor) { 8932 assert((MoveConstructor->isDefaulted() && 8933 MoveConstructor->isMoveConstructor() && 8934 !MoveConstructor->doesThisDeclarationHaveABody()) && 8935 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8936 8937 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8938 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8939 8940 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8941 DiagnosticErrorTrap Trap(Diags); 8942 8943 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8944 Trap.hasErrorOccurred()) { 8945 Diag(CurrentLocation, diag::note_member_synthesized_at) 8946 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8947 MoveConstructor->setInvalidDecl(); 8948 } else { 8949 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8950 MoveConstructor->getLocation(), 8951 MultiStmtArg(*this, 0, 0), 8952 /*isStmtExpr=*/false) 8953 .takeAs<Stmt>()); 8954 MoveConstructor->setImplicitlyDefined(true); 8955 } 8956 8957 MoveConstructor->setUsed(); 8958 8959 if (ASTMutationListener *L = getASTMutationListener()) { 8960 L->CompletedImplicitDefinition(MoveConstructor); 8961 } 8962} 8963 8964ExprResult 8965Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8966 CXXConstructorDecl *Constructor, 8967 MultiExprArg ExprArgs, 8968 bool HadMultipleCandidates, 8969 bool RequiresZeroInit, 8970 unsigned ConstructKind, 8971 SourceRange ParenRange) { 8972 bool Elidable = false; 8973 8974 // C++0x [class.copy]p34: 8975 // When certain criteria are met, an implementation is allowed to 8976 // omit the copy/move construction of a class object, even if the 8977 // copy/move constructor and/or destructor for the object have 8978 // side effects. [...] 8979 // - when a temporary class object that has not been bound to a 8980 // reference (12.2) would be copied/moved to a class object 8981 // with the same cv-unqualified type, the copy/move operation 8982 // can be omitted by constructing the temporary object 8983 // directly into the target of the omitted copy/move 8984 if (ConstructKind == CXXConstructExpr::CK_Complete && 8985 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 8986 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 8987 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 8988 } 8989 8990 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 8991 Elidable, move(ExprArgs), HadMultipleCandidates, 8992 RequiresZeroInit, ConstructKind, ParenRange); 8993} 8994 8995/// BuildCXXConstructExpr - Creates a complete call to a constructor, 8996/// including handling of its default argument expressions. 8997ExprResult 8998Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8999 CXXConstructorDecl *Constructor, bool Elidable, 9000 MultiExprArg ExprArgs, 9001 bool HadMultipleCandidates, 9002 bool RequiresZeroInit, 9003 unsigned ConstructKind, 9004 SourceRange ParenRange) { 9005 unsigned NumExprs = ExprArgs.size(); 9006 Expr **Exprs = (Expr **)ExprArgs.release(); 9007 9008 for (specific_attr_iterator<NonNullAttr> 9009 i = Constructor->specific_attr_begin<NonNullAttr>(), 9010 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 9011 const NonNullAttr *NonNull = *i; 9012 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 9013 } 9014 9015 MarkDeclarationReferenced(ConstructLoc, Constructor); 9016 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 9017 Constructor, Elidable, Exprs, NumExprs, 9018 HadMultipleCandidates, RequiresZeroInit, 9019 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 9020 ParenRange)); 9021} 9022 9023bool Sema::InitializeVarWithConstructor(VarDecl *VD, 9024 CXXConstructorDecl *Constructor, 9025 MultiExprArg Exprs, 9026 bool HadMultipleCandidates) { 9027 // FIXME: Provide the correct paren SourceRange when available. 9028 ExprResult TempResult = 9029 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 9030 move(Exprs), HadMultipleCandidates, false, 9031 CXXConstructExpr::CK_Complete, SourceRange()); 9032 if (TempResult.isInvalid()) 9033 return true; 9034 9035 Expr *Temp = TempResult.takeAs<Expr>(); 9036 CheckImplicitConversions(Temp, VD->getLocation()); 9037 MarkDeclarationReferenced(VD->getLocation(), Constructor); 9038 Temp = MaybeCreateExprWithCleanups(Temp); 9039 VD->setInit(Temp); 9040 9041 return false; 9042} 9043 9044void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9045 if (VD->isInvalidDecl()) return; 9046 9047 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9048 if (ClassDecl->isInvalidDecl()) return; 9049 if (ClassDecl->hasTrivialDestructor()) return; 9050 if (ClassDecl->isDependentContext()) return; 9051 9052 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9053 MarkDeclarationReferenced(VD->getLocation(), Destructor); 9054 CheckDestructorAccess(VD->getLocation(), Destructor, 9055 PDiag(diag::err_access_dtor_var) 9056 << VD->getDeclName() 9057 << VD->getType()); 9058 9059 if (!VD->hasGlobalStorage()) return; 9060 9061 // Emit warning for non-trivial dtor in global scope (a real global, 9062 // class-static, function-static). 9063 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9064 9065 // TODO: this should be re-enabled for static locals by !CXAAtExit 9066 if (!VD->isStaticLocal()) 9067 Diag(VD->getLocation(), diag::warn_global_destructor); 9068} 9069 9070/// AddCXXDirectInitializerToDecl - This action is called immediately after 9071/// ActOnDeclarator, when a C++ direct initializer is present. 9072/// e.g: "int x(1);" 9073void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 9074 SourceLocation LParenLoc, 9075 MultiExprArg Exprs, 9076 SourceLocation RParenLoc, 9077 bool TypeMayContainAuto) { 9078 // If there is no declaration, there was an error parsing it. Just ignore 9079 // the initializer. 9080 if (RealDecl == 0) 9081 return; 9082 9083 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 9084 if (!VDecl) { 9085 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 9086 RealDecl->setInvalidDecl(); 9087 return; 9088 } 9089 9090 // C++0x [dcl.spec.auto]p6. Deduce the type which 'auto' stands in for. 9091 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 9092 if (Exprs.size() == 0) { 9093 // It isn't possible to write this directly, but it is possible to 9094 // end up in this situation with "auto x(some_pack...);" 9095 Diag(LParenLoc, diag::err_auto_var_init_no_expression) 9096 << VDecl->getDeclName() << VDecl->getType() 9097 << VDecl->getSourceRange(); 9098 RealDecl->setInvalidDecl(); 9099 return; 9100 } 9101 9102 if (Exprs.size() > 1) { 9103 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 9104 diag::err_auto_var_init_multiple_expressions) 9105 << VDecl->getDeclName() << VDecl->getType() 9106 << VDecl->getSourceRange(); 9107 RealDecl->setInvalidDecl(); 9108 return; 9109 } 9110 9111 Expr *Init = Exprs.get()[0]; 9112 TypeSourceInfo *DeducedType = 0; 9113 if (DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType) == 9114 DAR_Failed) 9115 DiagnoseAutoDeductionFailure(VDecl, Init); 9116 if (!DeducedType) { 9117 RealDecl->setInvalidDecl(); 9118 return; 9119 } 9120 VDecl->setTypeSourceInfo(DeducedType); 9121 VDecl->setType(DeducedType->getType()); 9122 9123 // In ARC, infer lifetime. 9124 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 9125 VDecl->setInvalidDecl(); 9126 9127 // If this is a redeclaration, check that the type we just deduced matches 9128 // the previously declared type. 9129 if (VarDecl *Old = VDecl->getPreviousDecl()) 9130 MergeVarDeclTypes(VDecl, Old); 9131 } 9132 9133 // We will represent direct-initialization similarly to copy-initialization: 9134 // int x(1); -as-> int x = 1; 9135 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 9136 // 9137 // Clients that want to distinguish between the two forms, can check for 9138 // direct initializer using VarDecl::hasCXXDirectInitializer(). 9139 // A major benefit is that clients that don't particularly care about which 9140 // exactly form was it (like the CodeGen) can handle both cases without 9141 // special case code. 9142 9143 // C++ 8.5p11: 9144 // The form of initialization (using parentheses or '=') is generally 9145 // insignificant, but does matter when the entity being initialized has a 9146 // class type. 9147 9148 if (!VDecl->getType()->isDependentType() && 9149 !VDecl->getType()->isIncompleteArrayType() && 9150 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 9151 diag::err_typecheck_decl_incomplete_type)) { 9152 VDecl->setInvalidDecl(); 9153 return; 9154 } 9155 9156 // The variable can not have an abstract class type. 9157 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 9158 diag::err_abstract_type_in_decl, 9159 AbstractVariableType)) 9160 VDecl->setInvalidDecl(); 9161 9162 const VarDecl *Def; 9163 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 9164 Diag(VDecl->getLocation(), diag::err_redefinition) 9165 << VDecl->getDeclName(); 9166 Diag(Def->getLocation(), diag::note_previous_definition); 9167 VDecl->setInvalidDecl(); 9168 return; 9169 } 9170 9171 // C++ [class.static.data]p4 9172 // If a static data member is of const integral or const 9173 // enumeration type, its declaration in the class definition can 9174 // specify a constant-initializer which shall be an integral 9175 // constant expression (5.19). In that case, the member can appear 9176 // in integral constant expressions. The member shall still be 9177 // defined in a namespace scope if it is used in the program and the 9178 // namespace scope definition shall not contain an initializer. 9179 // 9180 // We already performed a redefinition check above, but for static 9181 // data members we also need to check whether there was an in-class 9182 // declaration with an initializer. 9183 const VarDecl* PrevInit = 0; 9184 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 9185 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 9186 Diag(PrevInit->getLocation(), diag::note_previous_definition); 9187 return; 9188 } 9189 9190 bool IsDependent = false; 9191 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 9192 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 9193 VDecl->setInvalidDecl(); 9194 return; 9195 } 9196 9197 if (Exprs.get()[I]->isTypeDependent()) 9198 IsDependent = true; 9199 } 9200 9201 // If either the declaration has a dependent type or if any of the 9202 // expressions is type-dependent, we represent the initialization 9203 // via a ParenListExpr for later use during template instantiation. 9204 if (VDecl->getType()->isDependentType() || IsDependent) { 9205 // Let clients know that initialization was done with a direct initializer. 9206 VDecl->setCXXDirectInitializer(true); 9207 9208 // Store the initialization expressions as a ParenListExpr. 9209 unsigned NumExprs = Exprs.size(); 9210 VDecl->setInit(new (Context) ParenListExpr( 9211 Context, LParenLoc, (Expr **)Exprs.release(), NumExprs, RParenLoc, 9212 VDecl->getType().getNonReferenceType())); 9213 return; 9214 } 9215 9216 // Capture the variable that is being initialized and the style of 9217 // initialization. 9218 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 9219 9220 // FIXME: Poor source location information. 9221 InitializationKind Kind 9222 = InitializationKind::CreateDirect(VDecl->getLocation(), 9223 LParenLoc, RParenLoc); 9224 9225 QualType T = VDecl->getType(); 9226 InitializationSequence InitSeq(*this, Entity, Kind, 9227 Exprs.get(), Exprs.size()); 9228 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs), &T); 9229 if (Result.isInvalid()) { 9230 VDecl->setInvalidDecl(); 9231 return; 9232 } else if (T != VDecl->getType()) { 9233 VDecl->setType(T); 9234 Result.get()->setType(T); 9235 } 9236 9237 9238 Expr *Init = Result.get(); 9239 CheckImplicitConversions(Init, LParenLoc); 9240 9241 Init = MaybeCreateExprWithCleanups(Init); 9242 VDecl->setInit(Init); 9243 VDecl->setCXXDirectInitializer(true); 9244 9245 CheckCompleteVariableDeclaration(VDecl); 9246} 9247 9248/// \brief Given a constructor and the set of arguments provided for the 9249/// constructor, convert the arguments and add any required default arguments 9250/// to form a proper call to this constructor. 9251/// 9252/// \returns true if an error occurred, false otherwise. 9253bool 9254Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9255 MultiExprArg ArgsPtr, 9256 SourceLocation Loc, 9257 ASTOwningVector<Expr*> &ConvertedArgs) { 9258 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9259 unsigned NumArgs = ArgsPtr.size(); 9260 Expr **Args = (Expr **)ArgsPtr.get(); 9261 9262 const FunctionProtoType *Proto 9263 = Constructor->getType()->getAs<FunctionProtoType>(); 9264 assert(Proto && "Constructor without a prototype?"); 9265 unsigned NumArgsInProto = Proto->getNumArgs(); 9266 9267 // If too few arguments are available, we'll fill in the rest with defaults. 9268 if (NumArgs < NumArgsInProto) 9269 ConvertedArgs.reserve(NumArgsInProto); 9270 else 9271 ConvertedArgs.reserve(NumArgs); 9272 9273 VariadicCallType CallType = 9274 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9275 SmallVector<Expr *, 8> AllArgs; 9276 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9277 Proto, 0, Args, NumArgs, AllArgs, 9278 CallType); 9279 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 9280 ConvertedArgs.push_back(AllArgs[i]); 9281 return Invalid; 9282} 9283 9284static inline bool 9285CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9286 const FunctionDecl *FnDecl) { 9287 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9288 if (isa<NamespaceDecl>(DC)) { 9289 return SemaRef.Diag(FnDecl->getLocation(), 9290 diag::err_operator_new_delete_declared_in_namespace) 9291 << FnDecl->getDeclName(); 9292 } 9293 9294 if (isa<TranslationUnitDecl>(DC) && 9295 FnDecl->getStorageClass() == SC_Static) { 9296 return SemaRef.Diag(FnDecl->getLocation(), 9297 diag::err_operator_new_delete_declared_static) 9298 << FnDecl->getDeclName(); 9299 } 9300 9301 return false; 9302} 9303 9304static inline bool 9305CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9306 CanQualType ExpectedResultType, 9307 CanQualType ExpectedFirstParamType, 9308 unsigned DependentParamTypeDiag, 9309 unsigned InvalidParamTypeDiag) { 9310 QualType ResultType = 9311 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9312 9313 // Check that the result type is not dependent. 9314 if (ResultType->isDependentType()) 9315 return SemaRef.Diag(FnDecl->getLocation(), 9316 diag::err_operator_new_delete_dependent_result_type) 9317 << FnDecl->getDeclName() << ExpectedResultType; 9318 9319 // Check that the result type is what we expect. 9320 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9321 return SemaRef.Diag(FnDecl->getLocation(), 9322 diag::err_operator_new_delete_invalid_result_type) 9323 << FnDecl->getDeclName() << ExpectedResultType; 9324 9325 // A function template must have at least 2 parameters. 9326 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9327 return SemaRef.Diag(FnDecl->getLocation(), 9328 diag::err_operator_new_delete_template_too_few_parameters) 9329 << FnDecl->getDeclName(); 9330 9331 // The function decl must have at least 1 parameter. 9332 if (FnDecl->getNumParams() == 0) 9333 return SemaRef.Diag(FnDecl->getLocation(), 9334 diag::err_operator_new_delete_too_few_parameters) 9335 << FnDecl->getDeclName(); 9336 9337 // Check the the first parameter type is not dependent. 9338 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9339 if (FirstParamType->isDependentType()) 9340 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9341 << FnDecl->getDeclName() << ExpectedFirstParamType; 9342 9343 // Check that the first parameter type is what we expect. 9344 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9345 ExpectedFirstParamType) 9346 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9347 << FnDecl->getDeclName() << ExpectedFirstParamType; 9348 9349 return false; 9350} 9351 9352static bool 9353CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9354 // C++ [basic.stc.dynamic.allocation]p1: 9355 // A program is ill-formed if an allocation function is declared in a 9356 // namespace scope other than global scope or declared static in global 9357 // scope. 9358 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9359 return true; 9360 9361 CanQualType SizeTy = 9362 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9363 9364 // C++ [basic.stc.dynamic.allocation]p1: 9365 // The return type shall be void*. The first parameter shall have type 9366 // std::size_t. 9367 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9368 SizeTy, 9369 diag::err_operator_new_dependent_param_type, 9370 diag::err_operator_new_param_type)) 9371 return true; 9372 9373 // C++ [basic.stc.dynamic.allocation]p1: 9374 // The first parameter shall not have an associated default argument. 9375 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9376 return SemaRef.Diag(FnDecl->getLocation(), 9377 diag::err_operator_new_default_arg) 9378 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9379 9380 return false; 9381} 9382 9383static bool 9384CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9385 // C++ [basic.stc.dynamic.deallocation]p1: 9386 // A program is ill-formed if deallocation functions are declared in a 9387 // namespace scope other than global scope or declared static in global 9388 // scope. 9389 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9390 return true; 9391 9392 // C++ [basic.stc.dynamic.deallocation]p2: 9393 // Each deallocation function shall return void and its first parameter 9394 // shall be void*. 9395 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9396 SemaRef.Context.VoidPtrTy, 9397 diag::err_operator_delete_dependent_param_type, 9398 diag::err_operator_delete_param_type)) 9399 return true; 9400 9401 return false; 9402} 9403 9404/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9405/// of this overloaded operator is well-formed. If so, returns false; 9406/// otherwise, emits appropriate diagnostics and returns true. 9407bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9408 assert(FnDecl && FnDecl->isOverloadedOperator() && 9409 "Expected an overloaded operator declaration"); 9410 9411 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9412 9413 // C++ [over.oper]p5: 9414 // The allocation and deallocation functions, operator new, 9415 // operator new[], operator delete and operator delete[], are 9416 // described completely in 3.7.3. The attributes and restrictions 9417 // found in the rest of this subclause do not apply to them unless 9418 // explicitly stated in 3.7.3. 9419 if (Op == OO_Delete || Op == OO_Array_Delete) 9420 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9421 9422 if (Op == OO_New || Op == OO_Array_New) 9423 return CheckOperatorNewDeclaration(*this, FnDecl); 9424 9425 // C++ [over.oper]p6: 9426 // An operator function shall either be a non-static member 9427 // function or be a non-member function and have at least one 9428 // parameter whose type is a class, a reference to a class, an 9429 // enumeration, or a reference to an enumeration. 9430 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9431 if (MethodDecl->isStatic()) 9432 return Diag(FnDecl->getLocation(), 9433 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9434 } else { 9435 bool ClassOrEnumParam = false; 9436 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9437 ParamEnd = FnDecl->param_end(); 9438 Param != ParamEnd; ++Param) { 9439 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9440 if (ParamType->isDependentType() || ParamType->isRecordType() || 9441 ParamType->isEnumeralType()) { 9442 ClassOrEnumParam = true; 9443 break; 9444 } 9445 } 9446 9447 if (!ClassOrEnumParam) 9448 return Diag(FnDecl->getLocation(), 9449 diag::err_operator_overload_needs_class_or_enum) 9450 << FnDecl->getDeclName(); 9451 } 9452 9453 // C++ [over.oper]p8: 9454 // An operator function cannot have default arguments (8.3.6), 9455 // except where explicitly stated below. 9456 // 9457 // Only the function-call operator allows default arguments 9458 // (C++ [over.call]p1). 9459 if (Op != OO_Call) { 9460 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9461 Param != FnDecl->param_end(); ++Param) { 9462 if ((*Param)->hasDefaultArg()) 9463 return Diag((*Param)->getLocation(), 9464 diag::err_operator_overload_default_arg) 9465 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9466 } 9467 } 9468 9469 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9470 { false, false, false } 9471#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9472 , { Unary, Binary, MemberOnly } 9473#include "clang/Basic/OperatorKinds.def" 9474 }; 9475 9476 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9477 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9478 bool MustBeMemberOperator = OperatorUses[Op][2]; 9479 9480 // C++ [over.oper]p8: 9481 // [...] Operator functions cannot have more or fewer parameters 9482 // than the number required for the corresponding operator, as 9483 // described in the rest of this subclause. 9484 unsigned NumParams = FnDecl->getNumParams() 9485 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9486 if (Op != OO_Call && 9487 ((NumParams == 1 && !CanBeUnaryOperator) || 9488 (NumParams == 2 && !CanBeBinaryOperator) || 9489 (NumParams < 1) || (NumParams > 2))) { 9490 // We have the wrong number of parameters. 9491 unsigned ErrorKind; 9492 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9493 ErrorKind = 2; // 2 -> unary or binary. 9494 } else if (CanBeUnaryOperator) { 9495 ErrorKind = 0; // 0 -> unary 9496 } else { 9497 assert(CanBeBinaryOperator && 9498 "All non-call overloaded operators are unary or binary!"); 9499 ErrorKind = 1; // 1 -> binary 9500 } 9501 9502 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9503 << FnDecl->getDeclName() << NumParams << ErrorKind; 9504 } 9505 9506 // Overloaded operators other than operator() cannot be variadic. 9507 if (Op != OO_Call && 9508 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9509 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9510 << FnDecl->getDeclName(); 9511 } 9512 9513 // Some operators must be non-static member functions. 9514 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9515 return Diag(FnDecl->getLocation(), 9516 diag::err_operator_overload_must_be_member) 9517 << FnDecl->getDeclName(); 9518 } 9519 9520 // C++ [over.inc]p1: 9521 // The user-defined function called operator++ implements the 9522 // prefix and postfix ++ operator. If this function is a member 9523 // function with no parameters, or a non-member function with one 9524 // parameter of class or enumeration type, it defines the prefix 9525 // increment operator ++ for objects of that type. If the function 9526 // is a member function with one parameter (which shall be of type 9527 // int) or a non-member function with two parameters (the second 9528 // of which shall be of type int), it defines the postfix 9529 // increment operator ++ for objects of that type. 9530 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9531 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9532 bool ParamIsInt = false; 9533 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9534 ParamIsInt = BT->getKind() == BuiltinType::Int; 9535 9536 if (!ParamIsInt) 9537 return Diag(LastParam->getLocation(), 9538 diag::err_operator_overload_post_incdec_must_be_int) 9539 << LastParam->getType() << (Op == OO_MinusMinus); 9540 } 9541 9542 return false; 9543} 9544 9545/// CheckLiteralOperatorDeclaration - Check whether the declaration 9546/// of this literal operator function is well-formed. If so, returns 9547/// false; otherwise, emits appropriate diagnostics and returns true. 9548bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9549 DeclContext *DC = FnDecl->getDeclContext(); 9550 Decl::Kind Kind = DC->getDeclKind(); 9551 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 9552 Kind != Decl::LinkageSpec) { 9553 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9554 << FnDecl->getDeclName(); 9555 return true; 9556 } 9557 9558 bool Valid = false; 9559 9560 // template <char...> type operator "" name() is the only valid template 9561 // signature, and the only valid signature with no parameters. 9562 if (FnDecl->param_size() == 0) { 9563 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 9564 // Must have only one template parameter 9565 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9566 if (Params->size() == 1) { 9567 NonTypeTemplateParmDecl *PmDecl = 9568 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9569 9570 // The template parameter must be a char parameter pack. 9571 if (PmDecl && PmDecl->isTemplateParameterPack() && 9572 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9573 Valid = true; 9574 } 9575 } 9576 } else { 9577 // Check the first parameter 9578 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9579 9580 QualType T = (*Param)->getType(); 9581 9582 // unsigned long long int, long double, and any character type are allowed 9583 // as the only parameters. 9584 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9585 Context.hasSameType(T, Context.LongDoubleTy) || 9586 Context.hasSameType(T, Context.CharTy) || 9587 Context.hasSameType(T, Context.WCharTy) || 9588 Context.hasSameType(T, Context.Char16Ty) || 9589 Context.hasSameType(T, Context.Char32Ty)) { 9590 if (++Param == FnDecl->param_end()) 9591 Valid = true; 9592 goto FinishedParams; 9593 } 9594 9595 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9596 const PointerType *PT = T->getAs<PointerType>(); 9597 if (!PT) 9598 goto FinishedParams; 9599 T = PT->getPointeeType(); 9600 if (!T.isConstQualified()) 9601 goto FinishedParams; 9602 T = T.getUnqualifiedType(); 9603 9604 // Move on to the second parameter; 9605 ++Param; 9606 9607 // If there is no second parameter, the first must be a const char * 9608 if (Param == FnDecl->param_end()) { 9609 if (Context.hasSameType(T, Context.CharTy)) 9610 Valid = true; 9611 goto FinishedParams; 9612 } 9613 9614 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9615 // are allowed as the first parameter to a two-parameter function 9616 if (!(Context.hasSameType(T, Context.CharTy) || 9617 Context.hasSameType(T, Context.WCharTy) || 9618 Context.hasSameType(T, Context.Char16Ty) || 9619 Context.hasSameType(T, Context.Char32Ty))) 9620 goto FinishedParams; 9621 9622 // The second and final parameter must be an std::size_t 9623 T = (*Param)->getType().getUnqualifiedType(); 9624 if (Context.hasSameType(T, Context.getSizeType()) && 9625 ++Param == FnDecl->param_end()) 9626 Valid = true; 9627 } 9628 9629 // FIXME: This diagnostic is absolutely terrible. 9630FinishedParams: 9631 if (!Valid) { 9632 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9633 << FnDecl->getDeclName(); 9634 return true; 9635 } 9636 9637 StringRef LiteralName 9638 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9639 if (LiteralName[0] != '_') { 9640 // C++0x [usrlit.suffix]p1: 9641 // Literal suffix identifiers that do not start with an underscore are 9642 // reserved for future standardization. 9643 bool IsHexFloat = true; 9644 if (LiteralName.size() > 1 && 9645 (LiteralName[0] == 'P' || LiteralName[0] == 'p')) { 9646 for (unsigned I = 1, N = LiteralName.size(); I < N; ++I) { 9647 if (!isdigit(LiteralName[I])) { 9648 IsHexFloat = false; 9649 break; 9650 } 9651 } 9652 } 9653 9654 if (IsHexFloat) 9655 Diag(FnDecl->getLocation(), diag::warn_user_literal_hexfloat) 9656 << LiteralName; 9657 else 9658 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9659 } 9660 9661 return false; 9662} 9663 9664/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9665/// linkage specification, including the language and (if present) 9666/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9667/// the location of the language string literal, which is provided 9668/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9669/// the '{' brace. Otherwise, this linkage specification does not 9670/// have any braces. 9671Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9672 SourceLocation LangLoc, 9673 StringRef Lang, 9674 SourceLocation LBraceLoc) { 9675 LinkageSpecDecl::LanguageIDs Language; 9676 if (Lang == "\"C\"") 9677 Language = LinkageSpecDecl::lang_c; 9678 else if (Lang == "\"C++\"") 9679 Language = LinkageSpecDecl::lang_cxx; 9680 else { 9681 Diag(LangLoc, diag::err_bad_language); 9682 return 0; 9683 } 9684 9685 // FIXME: Add all the various semantics of linkage specifications 9686 9687 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9688 ExternLoc, LangLoc, Language); 9689 CurContext->addDecl(D); 9690 PushDeclContext(S, D); 9691 return D; 9692} 9693 9694/// ActOnFinishLinkageSpecification - Complete the definition of 9695/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9696/// valid, it's the position of the closing '}' brace in a linkage 9697/// specification that uses braces. 9698Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9699 Decl *LinkageSpec, 9700 SourceLocation RBraceLoc) { 9701 if (LinkageSpec) { 9702 if (RBraceLoc.isValid()) { 9703 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9704 LSDecl->setRBraceLoc(RBraceLoc); 9705 } 9706 PopDeclContext(); 9707 } 9708 return LinkageSpec; 9709} 9710 9711/// \brief Perform semantic analysis for the variable declaration that 9712/// occurs within a C++ catch clause, returning the newly-created 9713/// variable. 9714VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9715 TypeSourceInfo *TInfo, 9716 SourceLocation StartLoc, 9717 SourceLocation Loc, 9718 IdentifierInfo *Name) { 9719 bool Invalid = false; 9720 QualType ExDeclType = TInfo->getType(); 9721 9722 // Arrays and functions decay. 9723 if (ExDeclType->isArrayType()) 9724 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9725 else if (ExDeclType->isFunctionType()) 9726 ExDeclType = Context.getPointerType(ExDeclType); 9727 9728 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9729 // The exception-declaration shall not denote a pointer or reference to an 9730 // incomplete type, other than [cv] void*. 9731 // N2844 forbids rvalue references. 9732 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9733 Diag(Loc, diag::err_catch_rvalue_ref); 9734 Invalid = true; 9735 } 9736 9737 // GCC allows catching pointers and references to incomplete types 9738 // as an extension; so do we, but we warn by default. 9739 9740 QualType BaseType = ExDeclType; 9741 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9742 unsigned DK = diag::err_catch_incomplete; 9743 bool IncompleteCatchIsInvalid = true; 9744 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9745 BaseType = Ptr->getPointeeType(); 9746 Mode = 1; 9747 DK = diag::ext_catch_incomplete_ptr; 9748 IncompleteCatchIsInvalid = false; 9749 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9750 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9751 BaseType = Ref->getPointeeType(); 9752 Mode = 2; 9753 DK = diag::ext_catch_incomplete_ref; 9754 IncompleteCatchIsInvalid = false; 9755 } 9756 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9757 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 9758 IncompleteCatchIsInvalid) 9759 Invalid = true; 9760 9761 if (!Invalid && !ExDeclType->isDependentType() && 9762 RequireNonAbstractType(Loc, ExDeclType, 9763 diag::err_abstract_type_in_decl, 9764 AbstractVariableType)) 9765 Invalid = true; 9766 9767 // Only the non-fragile NeXT runtime currently supports C++ catches 9768 // of ObjC types, and no runtime supports catching ObjC types by value. 9769 if (!Invalid && getLangOptions().ObjC1) { 9770 QualType T = ExDeclType; 9771 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9772 T = RT->getPointeeType(); 9773 9774 if (T->isObjCObjectType()) { 9775 Diag(Loc, diag::err_objc_object_catch); 9776 Invalid = true; 9777 } else if (T->isObjCObjectPointerType()) { 9778 if (!getLangOptions().ObjCNonFragileABI) 9779 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9780 } 9781 } 9782 9783 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9784 ExDeclType, TInfo, SC_None, SC_None); 9785 ExDecl->setExceptionVariable(true); 9786 9787 // In ARC, infer 'retaining' for variables of retainable type. 9788 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9789 Invalid = true; 9790 9791 if (!Invalid && !ExDeclType->isDependentType()) { 9792 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9793 // C++ [except.handle]p16: 9794 // The object declared in an exception-declaration or, if the 9795 // exception-declaration does not specify a name, a temporary (12.2) is 9796 // copy-initialized (8.5) from the exception object. [...] 9797 // The object is destroyed when the handler exits, after the destruction 9798 // of any automatic objects initialized within the handler. 9799 // 9800 // We just pretend to initialize the object with itself, then make sure 9801 // it can be destroyed later. 9802 QualType initType = ExDeclType; 9803 9804 InitializedEntity entity = 9805 InitializedEntity::InitializeVariable(ExDecl); 9806 InitializationKind initKind = 9807 InitializationKind::CreateCopy(Loc, SourceLocation()); 9808 9809 Expr *opaqueValue = 9810 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9811 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9812 ExprResult result = sequence.Perform(*this, entity, initKind, 9813 MultiExprArg(&opaqueValue, 1)); 9814 if (result.isInvalid()) 9815 Invalid = true; 9816 else { 9817 // If the constructor used was non-trivial, set this as the 9818 // "initializer". 9819 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9820 if (!construct->getConstructor()->isTrivial()) { 9821 Expr *init = MaybeCreateExprWithCleanups(construct); 9822 ExDecl->setInit(init); 9823 } 9824 9825 // And make sure it's destructable. 9826 FinalizeVarWithDestructor(ExDecl, recordType); 9827 } 9828 } 9829 } 9830 9831 if (Invalid) 9832 ExDecl->setInvalidDecl(); 9833 9834 return ExDecl; 9835} 9836 9837/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9838/// handler. 9839Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9840 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9841 bool Invalid = D.isInvalidType(); 9842 9843 // Check for unexpanded parameter packs. 9844 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9845 UPPC_ExceptionType)) { 9846 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9847 D.getIdentifierLoc()); 9848 Invalid = true; 9849 } 9850 9851 IdentifierInfo *II = D.getIdentifier(); 9852 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9853 LookupOrdinaryName, 9854 ForRedeclaration)) { 9855 // The scope should be freshly made just for us. There is just no way 9856 // it contains any previous declaration. 9857 assert(!S->isDeclScope(PrevDecl)); 9858 if (PrevDecl->isTemplateParameter()) { 9859 // Maybe we will complain about the shadowed template parameter. 9860 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9861 PrevDecl = 0; 9862 } 9863 } 9864 9865 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9866 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9867 << D.getCXXScopeSpec().getRange(); 9868 Invalid = true; 9869 } 9870 9871 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9872 D.getSourceRange().getBegin(), 9873 D.getIdentifierLoc(), 9874 D.getIdentifier()); 9875 if (Invalid) 9876 ExDecl->setInvalidDecl(); 9877 9878 // Add the exception declaration into this scope. 9879 if (II) 9880 PushOnScopeChains(ExDecl, S); 9881 else 9882 CurContext->addDecl(ExDecl); 9883 9884 ProcessDeclAttributes(S, ExDecl, D); 9885 return ExDecl; 9886} 9887 9888Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9889 Expr *AssertExpr, 9890 Expr *AssertMessageExpr_, 9891 SourceLocation RParenLoc) { 9892 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9893 9894 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9895 llvm::APSInt Cond; 9896 if (VerifyIntegerConstantExpression(AssertExpr, &Cond, 9897 diag::err_static_assert_expression_is_not_constant, 9898 /*AllowFold=*/false)) 9899 return 0; 9900 9901 if (!Cond) 9902 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9903 << AssertMessage->getString() << AssertExpr->getSourceRange(); 9904 } 9905 9906 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9907 return 0; 9908 9909 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9910 AssertExpr, AssertMessage, RParenLoc); 9911 9912 CurContext->addDecl(Decl); 9913 return Decl; 9914} 9915 9916/// \brief Perform semantic analysis of the given friend type declaration. 9917/// 9918/// \returns A friend declaration that. 9919FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc, 9920 SourceLocation FriendLoc, 9921 TypeSourceInfo *TSInfo) { 9922 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9923 9924 QualType T = TSInfo->getType(); 9925 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9926 9927 // C++03 [class.friend]p2: 9928 // An elaborated-type-specifier shall be used in a friend declaration 9929 // for a class.* 9930 // 9931 // * The class-key of the elaborated-type-specifier is required. 9932 if (!ActiveTemplateInstantiations.empty()) { 9933 // Do not complain about the form of friend template types during 9934 // template instantiation; we will already have complained when the 9935 // template was declared. 9936 } else if (!T->isElaboratedTypeSpecifier()) { 9937 // If we evaluated the type to a record type, suggest putting 9938 // a tag in front. 9939 if (const RecordType *RT = T->getAs<RecordType>()) { 9940 RecordDecl *RD = RT->getDecl(); 9941 9942 std::string InsertionText = std::string(" ") + RD->getKindName(); 9943 9944 Diag(TypeRange.getBegin(), 9945 getLangOptions().CPlusPlus0x ? 9946 diag::warn_cxx98_compat_unelaborated_friend_type : 9947 diag::ext_unelaborated_friend_type) 9948 << (unsigned) RD->getTagKind() 9949 << T 9950 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9951 InsertionText); 9952 } else { 9953 Diag(FriendLoc, 9954 getLangOptions().CPlusPlus0x ? 9955 diag::warn_cxx98_compat_nonclass_type_friend : 9956 diag::ext_nonclass_type_friend) 9957 << T 9958 << SourceRange(FriendLoc, TypeRange.getEnd()); 9959 } 9960 } else if (T->getAs<EnumType>()) { 9961 Diag(FriendLoc, 9962 getLangOptions().CPlusPlus0x ? 9963 diag::warn_cxx98_compat_enum_friend : 9964 diag::ext_enum_friend) 9965 << T 9966 << SourceRange(FriendLoc, TypeRange.getEnd()); 9967 } 9968 9969 // C++0x [class.friend]p3: 9970 // If the type specifier in a friend declaration designates a (possibly 9971 // cv-qualified) class type, that class is declared as a friend; otherwise, 9972 // the friend declaration is ignored. 9973 9974 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9975 // in [class.friend]p3 that we do not implement. 9976 9977 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc); 9978} 9979 9980/// Handle a friend tag declaration where the scope specifier was 9981/// templated. 9982Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9983 unsigned TagSpec, SourceLocation TagLoc, 9984 CXXScopeSpec &SS, 9985 IdentifierInfo *Name, SourceLocation NameLoc, 9986 AttributeList *Attr, 9987 MultiTemplateParamsArg TempParamLists) { 9988 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9989 9990 bool isExplicitSpecialization = false; 9991 bool Invalid = false; 9992 9993 if (TemplateParameterList *TemplateParams 9994 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9995 TempParamLists.get(), 9996 TempParamLists.size(), 9997 /*friend*/ true, 9998 isExplicitSpecialization, 9999 Invalid)) { 10000 if (TemplateParams->size() > 0) { 10001 // This is a declaration of a class template. 10002 if (Invalid) 10003 return 0; 10004 10005 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 10006 SS, Name, NameLoc, Attr, 10007 TemplateParams, AS_public, 10008 /*ModulePrivateLoc=*/SourceLocation(), 10009 TempParamLists.size() - 1, 10010 (TemplateParameterList**) TempParamLists.release()).take(); 10011 } else { 10012 // The "template<>" header is extraneous. 10013 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 10014 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 10015 isExplicitSpecialization = true; 10016 } 10017 } 10018 10019 if (Invalid) return 0; 10020 10021 bool isAllExplicitSpecializations = true; 10022 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 10023 if (TempParamLists.get()[I]->size()) { 10024 isAllExplicitSpecializations = false; 10025 break; 10026 } 10027 } 10028 10029 // FIXME: don't ignore attributes. 10030 10031 // If it's explicit specializations all the way down, just forget 10032 // about the template header and build an appropriate non-templated 10033 // friend. TODO: for source fidelity, remember the headers. 10034 if (isAllExplicitSpecializations) { 10035 if (SS.isEmpty()) { 10036 bool Owned = false; 10037 bool IsDependent = false; 10038 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 10039 Attr, AS_public, 10040 /*ModulePrivateLoc=*/SourceLocation(), 10041 MultiTemplateParamsArg(), Owned, IsDependent, 10042 /*ScopedEnumKWLoc=*/SourceLocation(), 10043 /*ScopedEnumUsesClassTag=*/false, 10044 /*UnderlyingType=*/TypeResult()); 10045 } 10046 10047 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 10048 ElaboratedTypeKeyword Keyword 10049 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10050 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 10051 *Name, NameLoc); 10052 if (T.isNull()) 10053 return 0; 10054 10055 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10056 if (isa<DependentNameType>(T)) { 10057 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10058 TL.setKeywordLoc(TagLoc); 10059 TL.setQualifierLoc(QualifierLoc); 10060 TL.setNameLoc(NameLoc); 10061 } else { 10062 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 10063 TL.setKeywordLoc(TagLoc); 10064 TL.setQualifierLoc(QualifierLoc); 10065 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 10066 } 10067 10068 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10069 TSI, FriendLoc); 10070 Friend->setAccess(AS_public); 10071 CurContext->addDecl(Friend); 10072 return Friend; 10073 } 10074 10075 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 10076 10077 10078 10079 // Handle the case of a templated-scope friend class. e.g. 10080 // template <class T> class A<T>::B; 10081 // FIXME: we don't support these right now. 10082 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10083 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 10084 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10085 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10086 TL.setKeywordLoc(TagLoc); 10087 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 10088 TL.setNameLoc(NameLoc); 10089 10090 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10091 TSI, FriendLoc); 10092 Friend->setAccess(AS_public); 10093 Friend->setUnsupportedFriend(true); 10094 CurContext->addDecl(Friend); 10095 return Friend; 10096} 10097 10098 10099/// Handle a friend type declaration. This works in tandem with 10100/// ActOnTag. 10101/// 10102/// Notes on friend class templates: 10103/// 10104/// We generally treat friend class declarations as if they were 10105/// declaring a class. So, for example, the elaborated type specifier 10106/// in a friend declaration is required to obey the restrictions of a 10107/// class-head (i.e. no typedefs in the scope chain), template 10108/// parameters are required to match up with simple template-ids, &c. 10109/// However, unlike when declaring a template specialization, it's 10110/// okay to refer to a template specialization without an empty 10111/// template parameter declaration, e.g. 10112/// friend class A<T>::B<unsigned>; 10113/// We permit this as a special case; if there are any template 10114/// parameters present at all, require proper matching, i.e. 10115/// template <> template <class T> friend class A<int>::B; 10116Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 10117 MultiTemplateParamsArg TempParams) { 10118 SourceLocation Loc = DS.getSourceRange().getBegin(); 10119 10120 assert(DS.isFriendSpecified()); 10121 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10122 10123 // Try to convert the decl specifier to a type. This works for 10124 // friend templates because ActOnTag never produces a ClassTemplateDecl 10125 // for a TUK_Friend. 10126 Declarator TheDeclarator(DS, Declarator::MemberContext); 10127 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 10128 QualType T = TSI->getType(); 10129 if (TheDeclarator.isInvalidType()) 10130 return 0; 10131 10132 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 10133 return 0; 10134 10135 // This is definitely an error in C++98. It's probably meant to 10136 // be forbidden in C++0x, too, but the specification is just 10137 // poorly written. 10138 // 10139 // The problem is with declarations like the following: 10140 // template <T> friend A<T>::foo; 10141 // where deciding whether a class C is a friend or not now hinges 10142 // on whether there exists an instantiation of A that causes 10143 // 'foo' to equal C. There are restrictions on class-heads 10144 // (which we declare (by fiat) elaborated friend declarations to 10145 // be) that makes this tractable. 10146 // 10147 // FIXME: handle "template <> friend class A<T>;", which 10148 // is possibly well-formed? Who even knows? 10149 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 10150 Diag(Loc, diag::err_tagless_friend_type_template) 10151 << DS.getSourceRange(); 10152 return 0; 10153 } 10154 10155 // C++98 [class.friend]p1: A friend of a class is a function 10156 // or class that is not a member of the class . . . 10157 // This is fixed in DR77, which just barely didn't make the C++03 10158 // deadline. It's also a very silly restriction that seriously 10159 // affects inner classes and which nobody else seems to implement; 10160 // thus we never diagnose it, not even in -pedantic. 10161 // 10162 // But note that we could warn about it: it's always useless to 10163 // friend one of your own members (it's not, however, worthless to 10164 // friend a member of an arbitrary specialization of your template). 10165 10166 Decl *D; 10167 if (unsigned NumTempParamLists = TempParams.size()) 10168 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10169 NumTempParamLists, 10170 TempParams.release(), 10171 TSI, 10172 DS.getFriendSpecLoc()); 10173 else 10174 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 10175 10176 if (!D) 10177 return 0; 10178 10179 D->setAccess(AS_public); 10180 CurContext->addDecl(D); 10181 10182 return D; 10183} 10184 10185Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 10186 MultiTemplateParamsArg TemplateParams) { 10187 const DeclSpec &DS = D.getDeclSpec(); 10188 10189 assert(DS.isFriendSpecified()); 10190 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10191 10192 SourceLocation Loc = D.getIdentifierLoc(); 10193 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10194 10195 // C++ [class.friend]p1 10196 // A friend of a class is a function or class.... 10197 // Note that this sees through typedefs, which is intended. 10198 // It *doesn't* see through dependent types, which is correct 10199 // according to [temp.arg.type]p3: 10200 // If a declaration acquires a function type through a 10201 // type dependent on a template-parameter and this causes 10202 // a declaration that does not use the syntactic form of a 10203 // function declarator to have a function type, the program 10204 // is ill-formed. 10205 if (!TInfo->getType()->isFunctionType()) { 10206 Diag(Loc, diag::err_unexpected_friend); 10207 10208 // It might be worthwhile to try to recover by creating an 10209 // appropriate declaration. 10210 return 0; 10211 } 10212 10213 // C++ [namespace.memdef]p3 10214 // - If a friend declaration in a non-local class first declares a 10215 // class or function, the friend class or function is a member 10216 // of the innermost enclosing namespace. 10217 // - The name of the friend is not found by simple name lookup 10218 // until a matching declaration is provided in that namespace 10219 // scope (either before or after the class declaration granting 10220 // friendship). 10221 // - If a friend function is called, its name may be found by the 10222 // name lookup that considers functions from namespaces and 10223 // classes associated with the types of the function arguments. 10224 // - When looking for a prior declaration of a class or a function 10225 // declared as a friend, scopes outside the innermost enclosing 10226 // namespace scope are not considered. 10227 10228 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10229 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10230 DeclarationName Name = NameInfo.getName(); 10231 assert(Name); 10232 10233 // Check for unexpanded parameter packs. 10234 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10235 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10236 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10237 return 0; 10238 10239 // The context we found the declaration in, or in which we should 10240 // create the declaration. 10241 DeclContext *DC; 10242 Scope *DCScope = S; 10243 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10244 ForRedeclaration); 10245 10246 // FIXME: there are different rules in local classes 10247 10248 // There are four cases here. 10249 // - There's no scope specifier, in which case we just go to the 10250 // appropriate scope and look for a function or function template 10251 // there as appropriate. 10252 // Recover from invalid scope qualifiers as if they just weren't there. 10253 if (SS.isInvalid() || !SS.isSet()) { 10254 // C++0x [namespace.memdef]p3: 10255 // If the name in a friend declaration is neither qualified nor 10256 // a template-id and the declaration is a function or an 10257 // elaborated-type-specifier, the lookup to determine whether 10258 // the entity has been previously declared shall not consider 10259 // any scopes outside the innermost enclosing namespace. 10260 // C++0x [class.friend]p11: 10261 // If a friend declaration appears in a local class and the name 10262 // specified is an unqualified name, a prior declaration is 10263 // looked up without considering scopes that are outside the 10264 // innermost enclosing non-class scope. For a friend function 10265 // declaration, if there is no prior declaration, the program is 10266 // ill-formed. 10267 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10268 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10269 10270 // Find the appropriate context according to the above. 10271 DC = CurContext; 10272 while (true) { 10273 // Skip class contexts. If someone can cite chapter and verse 10274 // for this behavior, that would be nice --- it's what GCC and 10275 // EDG do, and it seems like a reasonable intent, but the spec 10276 // really only says that checks for unqualified existing 10277 // declarations should stop at the nearest enclosing namespace, 10278 // not that they should only consider the nearest enclosing 10279 // namespace. 10280 while (DC->isRecord()) 10281 DC = DC->getParent(); 10282 10283 LookupQualifiedName(Previous, DC); 10284 10285 // TODO: decide what we think about using declarations. 10286 if (isLocal || !Previous.empty()) 10287 break; 10288 10289 if (isTemplateId) { 10290 if (isa<TranslationUnitDecl>(DC)) break; 10291 } else { 10292 if (DC->isFileContext()) break; 10293 } 10294 DC = DC->getParent(); 10295 } 10296 10297 // C++ [class.friend]p1: A friend of a class is a function or 10298 // class that is not a member of the class . . . 10299 // C++11 changes this for both friend types and functions. 10300 // Most C++ 98 compilers do seem to give an error here, so 10301 // we do, too. 10302 if (!Previous.empty() && DC->Equals(CurContext)) 10303 Diag(DS.getFriendSpecLoc(), 10304 getLangOptions().CPlusPlus0x ? 10305 diag::warn_cxx98_compat_friend_is_member : 10306 diag::err_friend_is_member); 10307 10308 DCScope = getScopeForDeclContext(S, DC); 10309 10310 // C++ [class.friend]p6: 10311 // A function can be defined in a friend declaration of a class if and 10312 // only if the class is a non-local class (9.8), the function name is 10313 // unqualified, and the function has namespace scope. 10314 if (isLocal && D.isFunctionDefinition()) { 10315 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10316 } 10317 10318 // - There's a non-dependent scope specifier, in which case we 10319 // compute it and do a previous lookup there for a function 10320 // or function template. 10321 } else if (!SS.getScopeRep()->isDependent()) { 10322 DC = computeDeclContext(SS); 10323 if (!DC) return 0; 10324 10325 if (RequireCompleteDeclContext(SS, DC)) return 0; 10326 10327 LookupQualifiedName(Previous, DC); 10328 10329 // Ignore things found implicitly in the wrong scope. 10330 // TODO: better diagnostics for this case. Suggesting the right 10331 // qualified scope would be nice... 10332 LookupResult::Filter F = Previous.makeFilter(); 10333 while (F.hasNext()) { 10334 NamedDecl *D = F.next(); 10335 if (!DC->InEnclosingNamespaceSetOf( 10336 D->getDeclContext()->getRedeclContext())) 10337 F.erase(); 10338 } 10339 F.done(); 10340 10341 if (Previous.empty()) { 10342 D.setInvalidType(); 10343 Diag(Loc, diag::err_qualified_friend_not_found) 10344 << Name << TInfo->getType(); 10345 return 0; 10346 } 10347 10348 // C++ [class.friend]p1: A friend of a class is a function or 10349 // class that is not a member of the class . . . 10350 if (DC->Equals(CurContext)) 10351 Diag(DS.getFriendSpecLoc(), 10352 getLangOptions().CPlusPlus0x ? 10353 diag::warn_cxx98_compat_friend_is_member : 10354 diag::err_friend_is_member); 10355 10356 if (D.isFunctionDefinition()) { 10357 // C++ [class.friend]p6: 10358 // A function can be defined in a friend declaration of a class if and 10359 // only if the class is a non-local class (9.8), the function name is 10360 // unqualified, and the function has namespace scope. 10361 SemaDiagnosticBuilder DB 10362 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10363 10364 DB << SS.getScopeRep(); 10365 if (DC->isFileContext()) 10366 DB << FixItHint::CreateRemoval(SS.getRange()); 10367 SS.clear(); 10368 } 10369 10370 // - There's a scope specifier that does not match any template 10371 // parameter lists, in which case we use some arbitrary context, 10372 // create a method or method template, and wait for instantiation. 10373 // - There's a scope specifier that does match some template 10374 // parameter lists, which we don't handle right now. 10375 } else { 10376 if (D.isFunctionDefinition()) { 10377 // C++ [class.friend]p6: 10378 // A function can be defined in a friend declaration of a class if and 10379 // only if the class is a non-local class (9.8), the function name is 10380 // unqualified, and the function has namespace scope. 10381 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10382 << SS.getScopeRep(); 10383 } 10384 10385 DC = CurContext; 10386 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10387 } 10388 10389 if (!DC->isRecord()) { 10390 // This implies that it has to be an operator or function. 10391 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10392 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10393 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10394 Diag(Loc, diag::err_introducing_special_friend) << 10395 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10396 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10397 return 0; 10398 } 10399 } 10400 10401 // FIXME: This is an egregious hack to cope with cases where the scope stack 10402 // does not contain the declaration context, i.e., in an out-of-line 10403 // definition of a class. 10404 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10405 if (!DCScope) { 10406 FakeDCScope.setEntity(DC); 10407 DCScope = &FakeDCScope; 10408 } 10409 10410 bool AddToScope = true; 10411 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10412 move(TemplateParams), AddToScope); 10413 if (!ND) return 0; 10414 10415 assert(ND->getDeclContext() == DC); 10416 assert(ND->getLexicalDeclContext() == CurContext); 10417 10418 // Add the function declaration to the appropriate lookup tables, 10419 // adjusting the redeclarations list as necessary. We don't 10420 // want to do this yet if the friending class is dependent. 10421 // 10422 // Also update the scope-based lookup if the target context's 10423 // lookup context is in lexical scope. 10424 if (!CurContext->isDependentContext()) { 10425 DC = DC->getRedeclContext(); 10426 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 10427 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10428 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10429 } 10430 10431 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10432 D.getIdentifierLoc(), ND, 10433 DS.getFriendSpecLoc()); 10434 FrD->setAccess(AS_public); 10435 CurContext->addDecl(FrD); 10436 10437 if (ND->isInvalidDecl()) 10438 FrD->setInvalidDecl(); 10439 else { 10440 FunctionDecl *FD; 10441 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10442 FD = FTD->getTemplatedDecl(); 10443 else 10444 FD = cast<FunctionDecl>(ND); 10445 10446 // Mark templated-scope function declarations as unsupported. 10447 if (FD->getNumTemplateParameterLists()) 10448 FrD->setUnsupportedFriend(true); 10449 } 10450 10451 return ND; 10452} 10453 10454void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10455 AdjustDeclIfTemplate(Dcl); 10456 10457 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10458 if (!Fn) { 10459 Diag(DelLoc, diag::err_deleted_non_function); 10460 return; 10461 } 10462 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10463 Diag(DelLoc, diag::err_deleted_decl_not_first); 10464 Diag(Prev->getLocation(), diag::note_previous_declaration); 10465 // If the declaration wasn't the first, we delete the function anyway for 10466 // recovery. 10467 } 10468 Fn->setDeletedAsWritten(); 10469} 10470 10471void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10472 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10473 10474 if (MD) { 10475 if (MD->getParent()->isDependentType()) { 10476 MD->setDefaulted(); 10477 MD->setExplicitlyDefaulted(); 10478 return; 10479 } 10480 10481 CXXSpecialMember Member = getSpecialMember(MD); 10482 if (Member == CXXInvalid) { 10483 Diag(DefaultLoc, diag::err_default_special_members); 10484 return; 10485 } 10486 10487 MD->setDefaulted(); 10488 MD->setExplicitlyDefaulted(); 10489 10490 // If this definition appears within the record, do the checking when 10491 // the record is complete. 10492 const FunctionDecl *Primary = MD; 10493 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10494 // Find the uninstantiated declaration that actually had the '= default' 10495 // on it. 10496 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10497 10498 if (Primary == Primary->getCanonicalDecl()) 10499 return; 10500 10501 switch (Member) { 10502 case CXXDefaultConstructor: { 10503 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10504 CheckExplicitlyDefaultedDefaultConstructor(CD); 10505 if (!CD->isInvalidDecl()) 10506 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10507 break; 10508 } 10509 10510 case CXXCopyConstructor: { 10511 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10512 CheckExplicitlyDefaultedCopyConstructor(CD); 10513 if (!CD->isInvalidDecl()) 10514 DefineImplicitCopyConstructor(DefaultLoc, CD); 10515 break; 10516 } 10517 10518 case CXXCopyAssignment: { 10519 CheckExplicitlyDefaultedCopyAssignment(MD); 10520 if (!MD->isInvalidDecl()) 10521 DefineImplicitCopyAssignment(DefaultLoc, MD); 10522 break; 10523 } 10524 10525 case CXXDestructor: { 10526 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10527 CheckExplicitlyDefaultedDestructor(DD); 10528 if (!DD->isInvalidDecl()) 10529 DefineImplicitDestructor(DefaultLoc, DD); 10530 break; 10531 } 10532 10533 case CXXMoveConstructor: { 10534 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10535 CheckExplicitlyDefaultedMoveConstructor(CD); 10536 if (!CD->isInvalidDecl()) 10537 DefineImplicitMoveConstructor(DefaultLoc, CD); 10538 break; 10539 } 10540 10541 case CXXMoveAssignment: { 10542 CheckExplicitlyDefaultedMoveAssignment(MD); 10543 if (!MD->isInvalidDecl()) 10544 DefineImplicitMoveAssignment(DefaultLoc, MD); 10545 break; 10546 } 10547 10548 case CXXInvalid: 10549 llvm_unreachable("Invalid special member."); 10550 } 10551 } else { 10552 Diag(DefaultLoc, diag::err_default_special_members); 10553 } 10554} 10555 10556static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10557 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10558 Stmt *SubStmt = *CI; 10559 if (!SubStmt) 10560 continue; 10561 if (isa<ReturnStmt>(SubStmt)) 10562 Self.Diag(SubStmt->getSourceRange().getBegin(), 10563 diag::err_return_in_constructor_handler); 10564 if (!isa<Expr>(SubStmt)) 10565 SearchForReturnInStmt(Self, SubStmt); 10566 } 10567} 10568 10569void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10570 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10571 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10572 SearchForReturnInStmt(*this, Handler); 10573 } 10574} 10575 10576bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10577 const CXXMethodDecl *Old) { 10578 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10579 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10580 10581 if (Context.hasSameType(NewTy, OldTy) || 10582 NewTy->isDependentType() || OldTy->isDependentType()) 10583 return false; 10584 10585 // Check if the return types are covariant 10586 QualType NewClassTy, OldClassTy; 10587 10588 /// Both types must be pointers or references to classes. 10589 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10590 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10591 NewClassTy = NewPT->getPointeeType(); 10592 OldClassTy = OldPT->getPointeeType(); 10593 } 10594 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10595 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10596 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10597 NewClassTy = NewRT->getPointeeType(); 10598 OldClassTy = OldRT->getPointeeType(); 10599 } 10600 } 10601 } 10602 10603 // The return types aren't either both pointers or references to a class type. 10604 if (NewClassTy.isNull()) { 10605 Diag(New->getLocation(), 10606 diag::err_different_return_type_for_overriding_virtual_function) 10607 << New->getDeclName() << NewTy << OldTy; 10608 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10609 10610 return true; 10611 } 10612 10613 // C++ [class.virtual]p6: 10614 // If the return type of D::f differs from the return type of B::f, the 10615 // class type in the return type of D::f shall be complete at the point of 10616 // declaration of D::f or shall be the class type D. 10617 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10618 if (!RT->isBeingDefined() && 10619 RequireCompleteType(New->getLocation(), NewClassTy, 10620 PDiag(diag::err_covariant_return_incomplete) 10621 << New->getDeclName())) 10622 return true; 10623 } 10624 10625 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10626 // Check if the new class derives from the old class. 10627 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10628 Diag(New->getLocation(), 10629 diag::err_covariant_return_not_derived) 10630 << New->getDeclName() << NewTy << OldTy; 10631 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10632 return true; 10633 } 10634 10635 // Check if we the conversion from derived to base is valid. 10636 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10637 diag::err_covariant_return_inaccessible_base, 10638 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10639 // FIXME: Should this point to the return type? 10640 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10641 // FIXME: this note won't trigger for delayed access control 10642 // diagnostics, and it's impossible to get an undelayed error 10643 // here from access control during the original parse because 10644 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10645 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10646 return true; 10647 } 10648 } 10649 10650 // The qualifiers of the return types must be the same. 10651 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10652 Diag(New->getLocation(), 10653 diag::err_covariant_return_type_different_qualifications) 10654 << New->getDeclName() << NewTy << OldTy; 10655 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10656 return true; 10657 }; 10658 10659 10660 // The new class type must have the same or less qualifiers as the old type. 10661 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10662 Diag(New->getLocation(), 10663 diag::err_covariant_return_type_class_type_more_qualified) 10664 << New->getDeclName() << NewTy << OldTy; 10665 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10666 return true; 10667 }; 10668 10669 return false; 10670} 10671 10672/// \brief Mark the given method pure. 10673/// 10674/// \param Method the method to be marked pure. 10675/// 10676/// \param InitRange the source range that covers the "0" initializer. 10677bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10678 SourceLocation EndLoc = InitRange.getEnd(); 10679 if (EndLoc.isValid()) 10680 Method->setRangeEnd(EndLoc); 10681 10682 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10683 Method->setPure(); 10684 return false; 10685 } 10686 10687 if (!Method->isInvalidDecl()) 10688 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10689 << Method->getDeclName() << InitRange; 10690 return true; 10691} 10692 10693/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10694/// an initializer for the out-of-line declaration 'Dcl'. The scope 10695/// is a fresh scope pushed for just this purpose. 10696/// 10697/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10698/// static data member of class X, names should be looked up in the scope of 10699/// class X. 10700void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10701 // If there is no declaration, there was an error parsing it. 10702 if (D == 0 || D->isInvalidDecl()) return; 10703 10704 // We should only get called for declarations with scope specifiers, like: 10705 // int foo::bar; 10706 assert(D->isOutOfLine()); 10707 EnterDeclaratorContext(S, D->getDeclContext()); 10708} 10709 10710/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10711/// initializer for the out-of-line declaration 'D'. 10712void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10713 // If there is no declaration, there was an error parsing it. 10714 if (D == 0 || D->isInvalidDecl()) return; 10715 10716 assert(D->isOutOfLine()); 10717 ExitDeclaratorContext(S); 10718} 10719 10720/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10721/// C++ if/switch/while/for statement. 10722/// e.g: "if (int x = f()) {...}" 10723DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10724 // C++ 6.4p2: 10725 // The declarator shall not specify a function or an array. 10726 // The type-specifier-seq shall not contain typedef and shall not declare a 10727 // new class or enumeration. 10728 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10729 "Parser allowed 'typedef' as storage class of condition decl."); 10730 10731 Decl *Dcl = ActOnDeclarator(S, D); 10732 if (!Dcl) 10733 return true; 10734 10735 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10736 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10737 << D.getSourceRange(); 10738 return true; 10739 } 10740 10741 return Dcl; 10742} 10743 10744void Sema::LoadExternalVTableUses() { 10745 if (!ExternalSource) 10746 return; 10747 10748 SmallVector<ExternalVTableUse, 4> VTables; 10749 ExternalSource->ReadUsedVTables(VTables); 10750 SmallVector<VTableUse, 4> NewUses; 10751 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10752 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10753 = VTablesUsed.find(VTables[I].Record); 10754 // Even if a definition wasn't required before, it may be required now. 10755 if (Pos != VTablesUsed.end()) { 10756 if (!Pos->second && VTables[I].DefinitionRequired) 10757 Pos->second = true; 10758 continue; 10759 } 10760 10761 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10762 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10763 } 10764 10765 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10766} 10767 10768void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10769 bool DefinitionRequired) { 10770 // Ignore any vtable uses in unevaluated operands or for classes that do 10771 // not have a vtable. 10772 if (!Class->isDynamicClass() || Class->isDependentContext() || 10773 CurContext->isDependentContext() || 10774 ExprEvalContexts.back().Context == Unevaluated) 10775 return; 10776 10777 // Try to insert this class into the map. 10778 LoadExternalVTableUses(); 10779 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10780 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10781 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10782 if (!Pos.second) { 10783 // If we already had an entry, check to see if we are promoting this vtable 10784 // to required a definition. If so, we need to reappend to the VTableUses 10785 // list, since we may have already processed the first entry. 10786 if (DefinitionRequired && !Pos.first->second) { 10787 Pos.first->second = true; 10788 } else { 10789 // Otherwise, we can early exit. 10790 return; 10791 } 10792 } 10793 10794 // Local classes need to have their virtual members marked 10795 // immediately. For all other classes, we mark their virtual members 10796 // at the end of the translation unit. 10797 if (Class->isLocalClass()) 10798 MarkVirtualMembersReferenced(Loc, Class); 10799 else 10800 VTableUses.push_back(std::make_pair(Class, Loc)); 10801} 10802 10803bool Sema::DefineUsedVTables() { 10804 LoadExternalVTableUses(); 10805 if (VTableUses.empty()) 10806 return false; 10807 10808 // Note: The VTableUses vector could grow as a result of marking 10809 // the members of a class as "used", so we check the size each 10810 // time through the loop and prefer indices (with are stable) to 10811 // iterators (which are not). 10812 bool DefinedAnything = false; 10813 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10814 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10815 if (!Class) 10816 continue; 10817 10818 SourceLocation Loc = VTableUses[I].second; 10819 10820 // If this class has a key function, but that key function is 10821 // defined in another translation unit, we don't need to emit the 10822 // vtable even though we're using it. 10823 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10824 if (KeyFunction && !KeyFunction->hasBody()) { 10825 switch (KeyFunction->getTemplateSpecializationKind()) { 10826 case TSK_Undeclared: 10827 case TSK_ExplicitSpecialization: 10828 case TSK_ExplicitInstantiationDeclaration: 10829 // The key function is in another translation unit. 10830 continue; 10831 10832 case TSK_ExplicitInstantiationDefinition: 10833 case TSK_ImplicitInstantiation: 10834 // We will be instantiating the key function. 10835 break; 10836 } 10837 } else if (!KeyFunction) { 10838 // If we have a class with no key function that is the subject 10839 // of an explicit instantiation declaration, suppress the 10840 // vtable; it will live with the explicit instantiation 10841 // definition. 10842 bool IsExplicitInstantiationDeclaration 10843 = Class->getTemplateSpecializationKind() 10844 == TSK_ExplicitInstantiationDeclaration; 10845 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10846 REnd = Class->redecls_end(); 10847 R != REnd; ++R) { 10848 TemplateSpecializationKind TSK 10849 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10850 if (TSK == TSK_ExplicitInstantiationDeclaration) 10851 IsExplicitInstantiationDeclaration = true; 10852 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10853 IsExplicitInstantiationDeclaration = false; 10854 break; 10855 } 10856 } 10857 10858 if (IsExplicitInstantiationDeclaration) 10859 continue; 10860 } 10861 10862 // Mark all of the virtual members of this class as referenced, so 10863 // that we can build a vtable. Then, tell the AST consumer that a 10864 // vtable for this class is required. 10865 DefinedAnything = true; 10866 MarkVirtualMembersReferenced(Loc, Class); 10867 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10868 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10869 10870 // Optionally warn if we're emitting a weak vtable. 10871 if (Class->getLinkage() == ExternalLinkage && 10872 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10873 const FunctionDecl *KeyFunctionDef = 0; 10874 if (!KeyFunction || 10875 (KeyFunction->hasBody(KeyFunctionDef) && 10876 KeyFunctionDef->isInlined())) 10877 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10878 TSK_ExplicitInstantiationDefinition 10879 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10880 << Class; 10881 } 10882 } 10883 VTableUses.clear(); 10884 10885 return DefinedAnything; 10886} 10887 10888void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10889 const CXXRecordDecl *RD) { 10890 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10891 e = RD->method_end(); i != e; ++i) { 10892 CXXMethodDecl *MD = *i; 10893 10894 // C++ [basic.def.odr]p2: 10895 // [...] A virtual member function is used if it is not pure. [...] 10896 if (MD->isVirtual() && !MD->isPure()) 10897 MarkDeclarationReferenced(Loc, MD); 10898 } 10899 10900 // Only classes that have virtual bases need a VTT. 10901 if (RD->getNumVBases() == 0) 10902 return; 10903 10904 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10905 e = RD->bases_end(); i != e; ++i) { 10906 const CXXRecordDecl *Base = 10907 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10908 if (Base->getNumVBases() == 0) 10909 continue; 10910 MarkVirtualMembersReferenced(Loc, Base); 10911 } 10912} 10913 10914/// SetIvarInitializers - This routine builds initialization ASTs for the 10915/// Objective-C implementation whose ivars need be initialized. 10916void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10917 if (!getLangOptions().CPlusPlus) 10918 return; 10919 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10920 SmallVector<ObjCIvarDecl*, 8> ivars; 10921 CollectIvarsToConstructOrDestruct(OID, ivars); 10922 if (ivars.empty()) 10923 return; 10924 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10925 for (unsigned i = 0; i < ivars.size(); i++) { 10926 FieldDecl *Field = ivars[i]; 10927 if (Field->isInvalidDecl()) 10928 continue; 10929 10930 CXXCtorInitializer *Member; 10931 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10932 InitializationKind InitKind = 10933 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10934 10935 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10936 ExprResult MemberInit = 10937 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10938 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10939 // Note, MemberInit could actually come back empty if no initialization 10940 // is required (e.g., because it would call a trivial default constructor) 10941 if (!MemberInit.get() || MemberInit.isInvalid()) 10942 continue; 10943 10944 Member = 10945 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10946 SourceLocation(), 10947 MemberInit.takeAs<Expr>(), 10948 SourceLocation()); 10949 AllToInit.push_back(Member); 10950 10951 // Be sure that the destructor is accessible and is marked as referenced. 10952 if (const RecordType *RecordTy 10953 = Context.getBaseElementType(Field->getType()) 10954 ->getAs<RecordType>()) { 10955 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10956 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10957 MarkDeclarationReferenced(Field->getLocation(), Destructor); 10958 CheckDestructorAccess(Field->getLocation(), Destructor, 10959 PDiag(diag::err_access_dtor_ivar) 10960 << Context.getBaseElementType(Field->getType())); 10961 } 10962 } 10963 } 10964 ObjCImplementation->setIvarInitializers(Context, 10965 AllToInit.data(), AllToInit.size()); 10966 } 10967} 10968 10969static 10970void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10971 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10972 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10973 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10974 Sema &S) { 10975 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10976 CE = Current.end(); 10977 if (Ctor->isInvalidDecl()) 10978 return; 10979 10980 const FunctionDecl *FNTarget = 0; 10981 CXXConstructorDecl *Target; 10982 10983 // We ignore the result here since if we don't have a body, Target will be 10984 // null below. 10985 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10986 Target 10987= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10988 10989 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10990 // Avoid dereferencing a null pointer here. 10991 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10992 10993 if (!Current.insert(Canonical)) 10994 return; 10995 10996 // We know that beyond here, we aren't chaining into a cycle. 10997 if (!Target || !Target->isDelegatingConstructor() || 10998 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10999 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11000 Valid.insert(*CI); 11001 Current.clear(); 11002 // We've hit a cycle. 11003 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 11004 Current.count(TCanonical)) { 11005 // If we haven't diagnosed this cycle yet, do so now. 11006 if (!Invalid.count(TCanonical)) { 11007 S.Diag((*Ctor->init_begin())->getSourceLocation(), 11008 diag::warn_delegating_ctor_cycle) 11009 << Ctor; 11010 11011 // Don't add a note for a function delegating directo to itself. 11012 if (TCanonical != Canonical) 11013 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 11014 11015 CXXConstructorDecl *C = Target; 11016 while (C->getCanonicalDecl() != Canonical) { 11017 (void)C->getTargetConstructor()->hasBody(FNTarget); 11018 assert(FNTarget && "Ctor cycle through bodiless function"); 11019 11020 C 11021 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 11022 S.Diag(C->getLocation(), diag::note_which_delegates_to); 11023 } 11024 } 11025 11026 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11027 Invalid.insert(*CI); 11028 Current.clear(); 11029 } else { 11030 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 11031 } 11032} 11033 11034 11035void Sema::CheckDelegatingCtorCycles() { 11036 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 11037 11038 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11039 CE = Current.end(); 11040 11041 for (DelegatingCtorDeclsType::iterator 11042 I = DelegatingCtorDecls.begin(ExternalSource), 11043 E = DelegatingCtorDecls.end(); 11044 I != E; ++I) { 11045 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 11046 } 11047 11048 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 11049 (*CI)->setInvalidDecl(); 11050} 11051 11052/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 11053Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 11054 // Implicitly declared functions (e.g. copy constructors) are 11055 // __host__ __device__ 11056 if (D->isImplicit()) 11057 return CFT_HostDevice; 11058 11059 if (D->hasAttr<CUDAGlobalAttr>()) 11060 return CFT_Global; 11061 11062 if (D->hasAttr<CUDADeviceAttr>()) { 11063 if (D->hasAttr<CUDAHostAttr>()) 11064 return CFT_HostDevice; 11065 else 11066 return CFT_Device; 11067 } 11068 11069 return CFT_Host; 11070} 11071 11072bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 11073 CUDAFunctionTarget CalleeTarget) { 11074 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 11075 // Callable from the device only." 11076 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 11077 return true; 11078 11079 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 11080 // Callable from the host only." 11081 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 11082 // Callable from the host only." 11083 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 11084 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 11085 return true; 11086 11087 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 11088 return true; 11089 11090 return false; 11091} 11092